Remove `expout*' globals from parser-defs.h

This commit removes the "expout*" globals from our parser code, turning
them into a structure that is passed when an expression needs to be
evaluated.  This is the initial step to make our parser less
"globalized".

This is mostly a mechanical patch, which creates a structure containing
the "expout*" globals and then modify all the functions that handle them
in order to take the structure as argument.  It is big, and has been
reviewed at least 4 times, so I think everything is covered.

Below you can see the message links from the discussions:

- First attempt:

<https://sourceware.org/ml/gdb-patches/2012-01/msg00522.html>
Message-ID: <m3k44s7qej.fsf@gmail.com>

- Second attempt:

<https://sourceware.org/ml/gdb-patches/2012-06/msg00054.html>
Message-Id: <1338665528-5932-1-git-send-email-sergiodj@redhat.com>

- Third attempt:

<https://sourceware.org/ml/gdb-patches/2014-01/msg00949.html>
Message-Id: <1390629467-27139-1-git-send-email-sergiodj@redhat.com>

- Fourth (last) attempt:

<https://sourceware.org/ml/gdb-patches/2014-03/msg00546.html>
Message-Id: <1395463432-29750-1-git-send-email-sergiodj@redhat.com>

gdb/
2014-03-27  Sergio Durigan Junior  <sergiodj@redhat.com>

	Remove some globals from our parser.
	* language.c (unk_lang_parser): Add "struct parser_state"
	argument.
	* language.h (struct language_defn) <la_parser>: Likewise.
	* parse.c (expout, expout_size, expout_ptr): Remove variables.
	(initialize_expout): Add "struct parser_state" argument.
	Rewrite function to use the parser state.
	(reallocate_expout, write_exp_elt, write_exp_elt_opcode,
	write_exp_elt_sym, write_exp_elt_block, write_exp_elt_objfile,
	write_exp_elt_longcst, write_exp_elt_dblcst,
	write_exp_elt_decfloatcst, write_exp_elt_type,
	write_exp_elt_intern, write_exp_string, write_exp_string_vector,
	write_exp_bitstring, write_exp_msymbol, mark_struct_expression,
	write_dollar_variable): Likewise.
	(parse_exp_in_context_1): Use parser state.
	(insert_type_address_space): Add "struct parser_state" argument.
	Use parser state.
	(increase_expout_size): New function.
	* parser-defs.h: Forward declare "struct language_defn" and
	"struct parser_state".
	(expout, expout_size, expout_ptr): Remove extern declarations.
	(parse_gdbarch, parse_language): Rewrite macro declarations to
	accept the parser state.
	(struct parser_state): New struct.
	(initialize_expout, reallocate_expout, write_exp_elt_opcode,
	write_exp_elt_sym, write_exp_elt_longcst, write_exp_elt_dblcst,
	write_exp_elt_decfloatcst, write_exp_elt_type,
	write_exp_elt_intern, write_exp_string, write_exp_string_vector,
	write_exp_bitstring, write_exp_elt_block, write_exp_elt_objfile,
	write_exp_msymbol, write_dollar_variable,
	mark_struct_expression, insert_type_address_space): Add "struct
	parser_state" argument.
	(increase_expout_size): New function.
	* utils.c (do_clear_parser_state): New function.
	(make_cleanup_clear_parser_state): Likewise.
	* utils.h (make_cleanup_clear_parser_state): New function
	prototype.
	* aarch64-linux-tdep.c (aarch64_stap_parse_special_token):
	Update calls to write_exp* in order to pass the parser state.
	* arm-linux-tdep.c (arm_stap_parse_special_token): Likewise.
	* i386-tdep.c (i386_stap_parse_special_token_triplet): Likewise.
	(i386_stap_parse_special_token_three_arg_disp): Likewise.
	* ppc-linux-tdep.c (ppc_stap_parse_special_token): Likewise.
	* stap-probe.c (stap_parse_register_operand): Likewise.
	(stap_parse_single_operand): Likewise.
	(stap_parse_argument_1): Likewise.
	(stap_parse_argument): Use parser state.
	* stap-probe.h: Include "parser-defs.h".
	(struct stap_parse_info) <pstate>: New field.
	* c-exp.y (parse_type): Rewrite to use parser state.
	(yyparse): Redefine to c_parse_internal.
	(pstate): New global variable.
	(parse_number): Add "struct parser_state" argument.
	(write_destructor_name): Likewise.
	(type_exp): Update calls to write_exp* and similars in order to
	use parser state.
	(exp1, exp, variable, qualified_name, space_identifier,
	typename, typebase): Likewise.
	(write_destructor_name, parse_number, lex_one_token,
	classify_name, classify_inner_name, c_parse): Add "struct
	parser_state" argument.  Update function to use parser state.
	* c-lang.h: Forward declare "struct parser_state".
	(c_parse): Add "struct parser_state" argument.
	* ada-exp.y (parse_type): Rewrite macro to use parser state.
	(yyparse): Redefine macro to ada_parse_internal.
	(pstate): New variable.
	(write_int, write_object_renaming, write_var_or_type,
	write_name_assoc, write_exp_op_with_string, write_ambiguous_var,
	type_int, type_long, type_long_long, type_float, type_double,
	type_long_double, type_char, type_boolean, type_system_address):
	Add "struct parser_state" argument.
	(exp1, primary, simple_exp, relation, and_exp, and_then_exp,
	or_exp, or_else_exp, xor_exp, type_prefix, opt_type_prefix,
	var_or_type, aggregate, aggregate_component_list,
	positional_list, others, component_group,
	component_associations): Update calls to write_exp* and similar
	functions in order to use parser state.
	(ada_parse, write_var_from_sym, write_int,
	write_exp_op_with_string, write_object_renaming,
	find_primitive_type, write_selectors, write_ambiguous_var,
	write_var_or_type, write_name_assoc, type_int, type_long,
	type_long_long, type_float, type_double, type_long_double,
	type_char, type_boolean, type_system_address): Add "struct
	parser_state" argument.  Adjust function to use parser state.
	* ada-lang.c (parse): Likewise.
	* ada-lang.h: Forward declare "struct parser_state".
	(ada_parse): Add "struct parser_state" argument.
	* ada-lex.l (processInt, processReal): Likewise.  Adjust all
	calls to both functions.
	* f-exp.y (parse_type, parse_f_type): Rewrite macros to use
	parser state.
	(yyparse): Redefine macro to f_parse_internal.
	(pstate): New variable.
	(parse_number): Add "struct parser_state" argument.
	(type_exp, exp, subrange, typebase): Update calls to write_exp*
	and similars in order to use parser state.
	(parse_number): Adjust code to use parser state.
	(yylex): Likewise.
	(f_parse): New function.
	* f-lang.h: Forward declare "struct parser_state".
	(f_parse): Add "struct parser_state" argument.
	* jv-exp.y (parse_type, parse_java_type): Rewrite macros to use
	parser state.
	(yyparse): Redefine macro for java_parse_internal.
	(pstate): New variable.
	(push_expression_name, push_expression_name, insert_exp): Add
	"struct parser_state" argument.
	(type_exp, StringLiteral, Literal, PrimitiveType, IntegralType,
	FloatingPointType, exp1, PrimaryNoNewArray, FieldAccess,
	FuncStart, MethodInvocation, ArrayAccess, PostfixExpression,
	PostIncrementExpression, PostDecrementExpression,
	UnaryExpression, PreIncrementExpression, PreDecrementExpression,
	UnaryExpressionNotPlusMinus, CastExpression,
	MultiplicativeExpression, AdditiveExpression, ShiftExpression,
	RelationalExpression, EqualityExpression, AndExpression,
	ExclusiveOrExpression, InclusiveOrExpression,
	ConditionalAndExpression, ConditionalOrExpression,
	ConditionalExpression, Assignment, LeftHandSide): Update
	calls to write_exp* and similars in order to use parser state.
	(parse_number): Ajust code to use parser state.
	(yylex): Likewise.
	(java_parse): New function.
	(push_variable): Add "struct parser_state" argument.  Adjust
	code to user parser state.
	(push_fieldnames, push_qualified_expression_name,
	push_expression_name, insert_exp): Likewise.
	* jv-lang.h: Forward declare "struct parser_state".
	(java_parse): Add "struct parser_state" argument.
	* m2-exp.y (parse_type, parse_m2_type): Rewrite macros to use
	parser state.
	(yyparse): Redefine macro to m2_parse_internal.
	(pstate): New variable.
	(type_exp, exp, fblock, variable, type): Update calls to
	write_exp* and similars to use parser state.
	(yylex): Likewise.
	(m2_parse): New function.
	* m2-lang.h: Forward declare "struct parser_state".
	(m2_parse): Add "struct parser_state" argument.
	* objc-lang.c (end_msglist): Add "struct parser_state" argument.
	* objc-lang.h: Forward declare "struct parser_state".
	(end_msglist): Add "struct parser_state" argument.
	* p-exp.y (parse_type): Rewrite macro to use parser state.
	(yyparse): Redefine macro to pascal_parse_internal.
	(pstate): New variable.
	(parse_number): Add "struct parser_state" argument.
	(type_exp, exp1, exp, qualified_name, variable): Update calls to
	write_exp* and similars in order to use parser state.
	(parse_number, yylex): Adjust code to use parser state.
	(pascal_parse): New function.
	* p-lang.h: Forward declare "struct parser_state".
	(pascal_parse): Add "struct parser_state" argument.
	* go-exp.y (parse_type): Rewrite macro to use parser state.
	(yyparse): Redefine macro to go_parse_internal.
	(pstate): New variable.
	(parse_number): Add "struct parser_state" argument.
	(type_exp, exp1, exp, variable, type): Update calls to
	write_exp* and similars in order to use parser state.
	(parse_number, lex_one_token, classify_name, yylex): Adjust code
	to use parser state.
	(go_parse): Likewise.
	* go-lang.h: Forward declare "struct parser_state".
	(go_parse): Add "struct parser_state" argument.

31 files changed, 2038 insertions, 1548 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ade657e..46f6141 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,168 @@
+2014-03-27  Sergio Durigan Junior  <sergiodj@redhat.com>
+
+	Remove some globals from our parser.
+	* language.c (unk_lang_parser): Add "struct parser_state"
+	argument.
+	* language.h (struct language_defn) <la_parser>: Likewise.
+	* parse.c (expout, expout_size, expout_ptr): Remove variables.
+	(initialize_expout): Add "struct parser_state" argument.
+	Rewrite function to use the parser state.
+	(reallocate_expout, write_exp_elt, write_exp_elt_opcode,
+	write_exp_elt_sym, write_exp_elt_block, write_exp_elt_objfile,
+	write_exp_elt_longcst, write_exp_elt_dblcst,
+	write_exp_elt_decfloatcst, write_exp_elt_type,
+	write_exp_elt_intern, write_exp_string, write_exp_string_vector,
+	write_exp_bitstring, write_exp_msymbol, mark_struct_expression,
+	write_dollar_variable): Likewise.
+	(parse_exp_in_context_1): Use parser state.
+	(insert_type_address_space): Add "struct parser_state" argument.
+	Use parser state.
+	(increase_expout_size): New function.
+	* parser-defs.h: Forward declare "struct language_defn" and
+	"struct parser_state".
+	(expout, expout_size, expout_ptr): Remove extern declarations.
+	(parse_gdbarch, parse_language): Rewrite macro declarations to
+	accept the parser state.
+	(struct parser_state): New struct.
+	(initialize_expout, reallocate_expout, write_exp_elt_opcode,
+	write_exp_elt_sym, write_exp_elt_longcst, write_exp_elt_dblcst,
+	write_exp_elt_decfloatcst, write_exp_elt_type,
+	write_exp_elt_intern, write_exp_string, write_exp_string_vector,
+	write_exp_bitstring, write_exp_elt_block, write_exp_elt_objfile,
+	write_exp_msymbol, write_dollar_variable,
+	mark_struct_expression, insert_type_address_space): Add "struct
+	parser_state" argument.
+	(increase_expout_size): New function.
+	* utils.c (do_clear_parser_state): New function.
+	(make_cleanup_clear_parser_state): Likewise.
+	* utils.h (make_cleanup_clear_parser_state): New function
+	prototype.
+	* aarch64-linux-tdep.c (aarch64_stap_parse_special_token):
+	Update calls to write_exp* in order to pass the parser state.
+	* arm-linux-tdep.c (arm_stap_parse_special_token): Likewise.
+	* i386-tdep.c (i386_stap_parse_special_token_triplet): Likewise.
+	(i386_stap_parse_special_token_three_arg_disp): Likewise.
+	* ppc-linux-tdep.c (ppc_stap_parse_special_token): Likewise.
+	* stap-probe.c (stap_parse_register_operand): Likewise.
+	(stap_parse_single_operand): Likewise.
+	(stap_parse_argument_1): Likewise.
+	(stap_parse_argument): Use parser state.
+	* stap-probe.h: Include "parser-defs.h".
+	(struct stap_parse_info) <pstate>: New field.
+	* c-exp.y (parse_type): Rewrite to use parser state.
+	(yyparse): Redefine to c_parse_internal.
+	(pstate): New global variable.
+	(parse_number): Add "struct parser_state" argument.
+	(write_destructor_name): Likewise.
+	(type_exp): Update calls to write_exp* and similars in order to
+	use parser state.
+	(exp1, exp, variable, qualified_name, space_identifier,
+	typename, typebase): Likewise.
+	(write_destructor_name, parse_number, lex_one_token,
+	classify_name, classify_inner_name, c_parse): Add "struct
+	parser_state" argument.  Update function to use parser state.
+	* c-lang.h: Forward declare "struct parser_state".
+	(c_parse): Add "struct parser_state" argument.
+	* ada-exp.y (parse_type): Rewrite macro to use parser state.
+	(yyparse): Redefine macro to ada_parse_internal.
+	(pstate): New variable.
+	(write_int, write_object_renaming, write_var_or_type,
+	write_name_assoc, write_exp_op_with_string, write_ambiguous_var,
+	type_int, type_long, type_long_long, type_float, type_double,
+	type_long_double, type_char, type_boolean, type_system_address):
+	Add "struct parser_state" argument.
+	(exp1, primary, simple_exp, relation, and_exp, and_then_exp,
+	or_exp, or_else_exp, xor_exp, type_prefix, opt_type_prefix,
+	var_or_type, aggregate, aggregate_component_list,
+	positional_list, others, component_group,
+	component_associations): Update calls to write_exp* and similar
+	functions in order to use parser state.
+	(ada_parse, write_var_from_sym, write_int,
+	write_exp_op_with_string, write_object_renaming,
+	find_primitive_type, write_selectors, write_ambiguous_var,
+	write_var_or_type, write_name_assoc, type_int, type_long,
+	type_long_long, type_float, type_double, type_long_double,
+	type_char, type_boolean, type_system_address): Add "struct
+	parser_state" argument.  Adjust function to use parser state.
+	* ada-lang.c (parse): Likewise.
+	* ada-lang.h: Forward declare "struct parser_state".
+	(ada_parse): Add "struct parser_state" argument.
+	* ada-lex.l (processInt, processReal): Likewise.  Adjust all
+	calls to both functions.
+	* f-exp.y (parse_type, parse_f_type): Rewrite macros to use
+	parser state.
+	(yyparse): Redefine macro to f_parse_internal.
+	(pstate): New variable.
+	(parse_number): Add "struct parser_state" argument.
+	(type_exp, exp, subrange, typebase): Update calls to write_exp*
+	and similars in order to use parser state.
+	(parse_number): Adjust code to use parser state.
+	(yylex): Likewise.
+	(f_parse): New function.
+	* f-lang.h: Forward declare "struct parser_state".
+	(f_parse): Add "struct parser_state" argument.
+	* jv-exp.y (parse_type, parse_java_type): Rewrite macros to use
+	parser state.
+	(yyparse): Redefine macro for java_parse_internal.
+	(pstate): New variable.
+	(push_expression_name, push_expression_name, insert_exp): Add
+	"struct parser_state" argument.
+	(type_exp, StringLiteral, Literal, PrimitiveType, IntegralType,
+	FloatingPointType, exp1, PrimaryNoNewArray, FieldAccess,
+	FuncStart, MethodInvocation, ArrayAccess, PostfixExpression,
+	PostIncrementExpression, PostDecrementExpression,
+	UnaryExpression, PreIncrementExpression, PreDecrementExpression,
+	UnaryExpressionNotPlusMinus, CastExpression,
+	MultiplicativeExpression, AdditiveExpression, ShiftExpression,
+	RelationalExpression, EqualityExpression, AndExpression,
+	ExclusiveOrExpression, InclusiveOrExpression,
+	ConditionalAndExpression, ConditionalOrExpression,
+	ConditionalExpression, Assignment, LeftHandSide): Update
+	calls to write_exp* and similars in order to use parser state.
+	(parse_number): Ajust code to use parser state.
+	(yylex): Likewise.
+	(java_parse): New function.
+	(push_variable): Add "struct parser_state" argument.  Adjust
+	code to user parser state.
+	(push_fieldnames, push_qualified_expression_name,
+	push_expression_name, insert_exp): Likewise.
+	* jv-lang.h: Forward declare "struct parser_state".
+	(java_parse): Add "struct parser_state" argument.
+	* m2-exp.y (parse_type, parse_m2_type): Rewrite macros to use
+	parser state.
+	(yyparse): Redefine macro to m2_parse_internal.
+	(pstate): New variable.
+	(type_exp, exp, fblock, variable, type): Update calls to
+	write_exp* and similars to use parser state.
+	(yylex): Likewise.
+	(m2_parse): New function.
+	* m2-lang.h: Forward declare "struct parser_state".
+	(m2_parse): Add "struct parser_state" argument.
+	* objc-lang.c (end_msglist): Add "struct parser_state" argument.
+	* objc-lang.h: Forward declare "struct parser_state".
+	(end_msglist): Add "struct parser_state" argument.
+	* p-exp.y (parse_type): Rewrite macro to use parser state.
+	(yyparse): Redefine macro to pascal_parse_internal.
+	(pstate): New variable.
+	(parse_number): Add "struct parser_state" argument.
+	(type_exp, exp1, exp, qualified_name, variable): Update calls to
+	write_exp* and similars in order to use parser state.
+	(parse_number, yylex): Adjust code to use parser state.
+	(pascal_parse): New function.
+	* p-lang.h: Forward declare "struct parser_state".
+	(pascal_parse): Add "struct parser_state" argument.
+	* go-exp.y (parse_type): Rewrite macro to use parser state.
+	(yyparse): Redefine macro to go_parse_internal.
+	(pstate): New variable.
+	(parse_number): Add "struct parser_state" argument.
+	(type_exp, exp1, exp, variable, type): Update calls to
+	write_exp* and similars in order to use parser state.
+	(parse_number, lex_one_token, classify_name, yylex): Adjust code
+	to use parser state.
+	(go_parse): Likewise.
+	* go-lang.h: Forward declare "struct parser_state".
+	(go_parse): Add "struct parser_state" argument.
+
 2014-03-27  Doug Evans  <dje@google.com>
 
 	* dwarf2read.c (read_str_index): Delete arg cu.  All callers updated.
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 194e4cc..92d1248 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -352,28 +352,28 @@ aarch64_stap_parse_special_token (struct gdbarch *gdbarch,
 	return 0;
 
       /* The displacement.  */
-      write_exp_elt_opcode (OP_LONG);
-      write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-      write_exp_elt_longcst (displacement);
-      write_exp_elt_opcode (OP_LONG);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
+      write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
+      write_exp_elt_longcst (&p->pstate, displacement);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
       if (got_minus)
-	write_exp_elt_opcode (UNOP_NEG);
+	write_exp_elt_opcode (&p->pstate, UNOP_NEG);
 
       /* The register name.  */
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       str.ptr = regname;
       str.length = len;
-      write_exp_string (str);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, str);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
-      write_exp_elt_opcode (BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
       /* Casting to the expected type.  */
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (lookup_pointer_type (p->arg_type));
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate, lookup_pointer_type (p->arg_type));
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (UNOP_IND);
+      write_exp_elt_opcode (&p->pstate, UNOP_IND);
 
       p->arg = tmp;
     }
diff --git a/gdb/ada-exp.y b/gdb/ada-exp.y
index 4273f1d..9815f23 100644
--- a/gdb/ada-exp.y
+++ b/gdb/ada-exp.y
@@ -49,7 +49,7 @@
 #include "frame.h"
 #include "block.h"
 
-#define parse_type builtin_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -63,7 +63,8 @@
    without BISON?  (PNH) */
 
 #define	yymaxdepth ada_maxdepth
-#define	yyparse	_ada_parse	/* ada_parse calls this after  initialization */
+/* ada_parse calls this after initialization */
+#define	yyparse	ada_parse_internal
 #define	yylex	ada_lex
 #define	yyerror	ada_error
 #define	yylval	ada_lval
@@ -113,6 +114,11 @@ struct name_info {
   struct stoken stoken;
 };
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 static struct stoken empty_stoken = { "", 0 };
 
 /* If expression is in the context of TYPE'(...), then TYPE, else
@@ -125,40 +131,44 @@ static int yylex (void);
 
 void yyerror (char *);
 
-static void write_int (LONGEST, struct type *);
+static void write_int (struct parser_state *, LONGEST, struct type *);
 
-static void write_object_renaming (const struct block *, const char *, int,
+static void write_object_renaming (struct parser_state *,
+				   const struct block *, const char *, int,
 				   const char *, int);
 
-static struct type* write_var_or_type (const struct block *, struct stoken);
+static struct type* write_var_or_type (struct parser_state *,
+				       const struct block *, struct stoken);
 
-static void write_name_assoc (struct stoken);
+static void write_name_assoc (struct parser_state *, struct stoken);
 
-static void write_exp_op_with_string (enum exp_opcode, struct stoken);
+static void write_exp_op_with_string (struct parser_state *, enum exp_opcode,
+				      struct stoken);
 
 static struct block *block_lookup (struct block *, const char *);
 
 static LONGEST convert_char_literal (struct type *, LONGEST);
 
-static void write_ambiguous_var (const struct block *, char *, int);
+static void write_ambiguous_var (struct parser_state *,
+				 const struct block *, char *, int);
 
-static struct type *type_int (void);
+static struct type *type_int (struct parser_state *);
 
-static struct type *type_long (void);
+static struct type *type_long (struct parser_state *);
 
-static struct type *type_long_long (void);
+static struct type *type_long_long (struct parser_state *);
 
-static struct type *type_float (void);
+static struct type *type_float (struct parser_state *);
 
-static struct type *type_double (void);
+static struct type *type_double (struct parser_state *);
 
-static struct type *type_long_double (void);
+static struct type *type_long_double (struct parser_state *);
 
-static struct type *type_char (void);
+static struct type *type_char (struct parser_state *);
 
-static struct type *type_boolean (void);
+static struct type *type_boolean (struct parser_state *);
 
-static struct type *type_system_address (void);
+static struct type *type_system_address (struct parser_state *);
 
 %}
 
@@ -234,25 +244,26 @@ start   :	exp1
 /* Expressions, including the sequencing operator.  */
 exp1	:	exp
 	|	exp1 ';' exp
-			{ write_exp_elt_opcode (BINOP_COMMA); }
+			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
 	| 	primary ASSIGN exp   /* Extension for convenience */
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 /* Expressions, not including the sequencing operator.  */
 primary :	primary DOT_ALL
-			{ write_exp_elt_opcode (UNOP_IND); }
+			{ write_exp_elt_opcode (pstate, UNOP_IND); }
 	;
 
 primary :	primary DOT_ID
-			{ write_exp_op_with_string (STRUCTOP_STRUCT, $2); }
+			{ write_exp_op_with_string (pstate, STRUCTOP_STRUCT,
+						    $2); }
 	;
 
 primary :	primary '(' arglist ')'
 			{
-			  write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ($3);
-			  write_exp_elt_opcode (OP_FUNCALL);
+			  write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate, $3);
+			  write_exp_elt_opcode (pstate, OP_FUNCALL);
 		        }
 	|	var_or_type '(' arglist ')'
 			{
@@ -260,15 +271,15 @@ primary :	primary '(' arglist ')'
 			    {
 			      if ($3 != 1)
 				error (_("Invalid conversion"));
-			      write_exp_elt_opcode (UNOP_CAST);
-			      write_exp_elt_type ($1);
-			      write_exp_elt_opcode (UNOP_CAST);
+			      write_exp_elt_opcode (pstate, UNOP_CAST);
+			      write_exp_elt_type (pstate, $1);
+			      write_exp_elt_opcode (pstate, UNOP_CAST);
 			    }
 			  else
 			    {
-			      write_exp_elt_opcode (OP_FUNCALL);
-			      write_exp_elt_longcst ($3);
-			      write_exp_elt_opcode (OP_FUNCALL);
+			      write_exp_elt_opcode (pstate, OP_FUNCALL);
+			      write_exp_elt_longcst (pstate, $3);
+			      write_exp_elt_opcode (pstate, OP_FUNCALL);
 			    }
 			}
 	;
@@ -278,9 +289,9 @@ primary :	var_or_type '\'' save_qualifier { type_qualifier = $1; }
 			{
 			  if ($1 == NULL)
 			    error (_("Type required for qualification"));
-			  write_exp_elt_opcode (UNOP_QUAL);
-			  write_exp_elt_type ($1);
-			  write_exp_elt_opcode (UNOP_QUAL);
+			  write_exp_elt_opcode (pstate, UNOP_QUAL);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, UNOP_QUAL);
 			  type_qualifier = $3;
 			}
 	;
@@ -290,10 +301,10 @@ save_qualifier : 	{ $$ = type_qualifier; }
 
 primary :
 		primary '(' simple_exp DOTDOT simple_exp ')'
-			{ write_exp_elt_opcode (TERNOP_SLICE); }
+			{ write_exp_elt_opcode (pstate, TERNOP_SLICE); }
 	|	var_or_type '(' simple_exp DOTDOT simple_exp ')'
 			{ if ($1 == NULL) 
-                            write_exp_elt_opcode (TERNOP_SLICE);
+                            write_exp_elt_opcode (pstate, TERNOP_SLICE);
 			  else
 			    error (_("Cannot slice a type"));
 			}
@@ -313,15 +324,15 @@ primary :	'(' exp1 ')'	{ }
 primary :	var_or_type	%prec VAR
 			{ if ($1 != NULL)
 			    {
-			      write_exp_elt_opcode (OP_TYPE);
-			      write_exp_elt_type ($1);
-			      write_exp_elt_opcode (OP_TYPE);
+			      write_exp_elt_opcode (pstate, OP_TYPE);
+			      write_exp_elt_type (pstate, $1);
+			      write_exp_elt_opcode (pstate, OP_TYPE);
 			    }
 			}
 	;
 
 primary :	SPECIAL_VARIABLE /* Various GDB extensions */
-			{ write_dollar_variable ($1); }
+			{ write_dollar_variable (pstate, $1); }
 	;
 
 primary :     	aggregate
@@ -331,19 +342,19 @@ simple_exp : 	primary
 	;
 
 simple_exp :	'-' simple_exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_NEG); }
+			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 simple_exp :	'+' simple_exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PLUS); }
+			{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
 	;
 
 simple_exp :	NOT simple_exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 simple_exp :    ABS simple_exp	   %prec UNARY
-			{ write_exp_elt_opcode (UNOP_ABS); }
+			{ write_exp_elt_opcode (pstate, UNOP_ABS); }
 	;
 
 arglist	:		{ $$ = 0; }
@@ -364,111 +375,111 @@ primary :	'{' var_or_type '}' primary  %prec '.'
 			{ 
 			  if ($2 == NULL)
 			    error (_("Type required within braces in coercion"));
-			  write_exp_elt_opcode (UNOP_MEMVAL);
-			  write_exp_elt_type ($2);
-			  write_exp_elt_opcode (UNOP_MEMVAL);
+			  write_exp_elt_opcode (pstate, UNOP_MEMVAL);
+			  write_exp_elt_type (pstate, $2);
+			  write_exp_elt_opcode (pstate, UNOP_MEMVAL);
 			}
 	;
 
 /* Binary operators in order of decreasing precedence.  */
 
 simple_exp 	: 	simple_exp STARSTAR simple_exp
-			{ write_exp_elt_opcode (BINOP_EXP); }
+			{ write_exp_elt_opcode (pstate, BINOP_EXP); }
 	;
 
 simple_exp	:	simple_exp '*' simple_exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 simple_exp	:	simple_exp '/' simple_exp
-			{ write_exp_elt_opcode (BINOP_DIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 	;
 
 simple_exp	:	simple_exp REM simple_exp /* May need to be fixed to give correct Ada REM */
-			{ write_exp_elt_opcode (BINOP_REM); }
+			{ write_exp_elt_opcode (pstate, BINOP_REM); }
 	;
 
 simple_exp	:	simple_exp MOD simple_exp
-			{ write_exp_elt_opcode (BINOP_MOD); }
+			{ write_exp_elt_opcode (pstate, BINOP_MOD); }
 	;
 
 simple_exp	:	simple_exp '@' simple_exp	/* GDB extension */
-			{ write_exp_elt_opcode (BINOP_REPEAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
 	;
 
 simple_exp	:	simple_exp '+' simple_exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 simple_exp	:	simple_exp '&' simple_exp
-			{ write_exp_elt_opcode (BINOP_CONCAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_CONCAT); }
 	;
 
 simple_exp	:	simple_exp '-' simple_exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 relation :	simple_exp
 	;
 
 relation :	simple_exp '=' simple_exp
-			{ write_exp_elt_opcode (BINOP_EQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 	;
 
 relation :	simple_exp NOTEQUAL simple_exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 	;
 
 relation :	simple_exp LEQ simple_exp
-			{ write_exp_elt_opcode (BINOP_LEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 	;
 
 relation :	simple_exp IN simple_exp DOTDOT simple_exp
-			{ write_exp_elt_opcode (TERNOP_IN_RANGE); }
+			{ write_exp_elt_opcode (pstate, TERNOP_IN_RANGE); }
         |       simple_exp IN primary TICK_RANGE tick_arglist
-			{ write_exp_elt_opcode (BINOP_IN_BOUNDS);
-			  write_exp_elt_longcst ((LONGEST) $5);
-			  write_exp_elt_opcode (BINOP_IN_BOUNDS);
+			{ write_exp_elt_opcode (pstate, BINOP_IN_BOUNDS);
+			  write_exp_elt_longcst (pstate, (LONGEST) $5);
+			  write_exp_elt_opcode (pstate, BINOP_IN_BOUNDS);
 			}
  	|	simple_exp IN var_or_type	%prec TICK_ACCESS
 			{ 
 			  if ($3 == NULL)
 			    error (_("Right operand of 'in' must be type"));
-			  write_exp_elt_opcode (UNOP_IN_RANGE);
-		          write_exp_elt_type ($3);
-		          write_exp_elt_opcode (UNOP_IN_RANGE);
+			  write_exp_elt_opcode (pstate, UNOP_IN_RANGE);
+		          write_exp_elt_type (pstate, $3);
+		          write_exp_elt_opcode (pstate, UNOP_IN_RANGE);
 			}
 	|	simple_exp NOT IN simple_exp DOTDOT simple_exp
-			{ write_exp_elt_opcode (TERNOP_IN_RANGE);
-		          write_exp_elt_opcode (UNOP_LOGICAL_NOT);
+			{ write_exp_elt_opcode (pstate, TERNOP_IN_RANGE);
+		          write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT);
 			}
         |       simple_exp NOT IN primary TICK_RANGE tick_arglist
-			{ write_exp_elt_opcode (BINOP_IN_BOUNDS);
-			  write_exp_elt_longcst ((LONGEST) $6);
-			  write_exp_elt_opcode (BINOP_IN_BOUNDS);
-		          write_exp_elt_opcode (UNOP_LOGICAL_NOT);
+			{ write_exp_elt_opcode (pstate, BINOP_IN_BOUNDS);
+			  write_exp_elt_longcst (pstate, (LONGEST) $6);
+			  write_exp_elt_opcode (pstate, BINOP_IN_BOUNDS);
+		          write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT);
 			}
  	|	simple_exp NOT IN var_or_type	%prec TICK_ACCESS
 			{ 
 			  if ($4 == NULL)
 			    error (_("Right operand of 'in' must be type"));
-			  write_exp_elt_opcode (UNOP_IN_RANGE);
-		          write_exp_elt_type ($4);
-		          write_exp_elt_opcode (UNOP_IN_RANGE);
-		          write_exp_elt_opcode (UNOP_LOGICAL_NOT);
+			  write_exp_elt_opcode (pstate, UNOP_IN_RANGE);
+		          write_exp_elt_type (pstate, $4);
+		          write_exp_elt_opcode (pstate, UNOP_IN_RANGE);
+		          write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT);
 			}
 	;
 
 relation :	simple_exp GEQ simple_exp
-			{ write_exp_elt_opcode (BINOP_GEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 	;
 
 relation :	simple_exp '<' simple_exp
-			{ write_exp_elt_opcode (BINOP_LESS); }
+			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 	;
 
 relation :	simple_exp '>' simple_exp
-			{ write_exp_elt_opcode (BINOP_GTR); }
+			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 	;
 
 exp	:	relation
@@ -481,36 +492,36 @@ exp	:	relation
 
 and_exp :
 		relation _AND_ relation 
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	|	and_exp _AND_ relation
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	;
 
 and_then_exp :
 	       relation _AND_ THEN relation
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 	|	and_then_exp _AND_ THEN relation
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
         ;
 
 or_exp :
 		relation OR relation 
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	|	or_exp OR relation
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	;
 
 or_else_exp :
 	       relation OR ELSE relation
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 	|      or_else_exp OR ELSE relation
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
         ;
 
 xor_exp :       relation XOR relation
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 	|	xor_exp XOR relation
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
         ;
 
 /* Primaries can denote types (OP_TYPE).  In cases such as 
@@ -522,36 +533,37 @@ xor_exp :       relation XOR relation
    aType'access evaluates to a type that evaluate_subexp attempts to 
    evaluate. */
 primary :	primary TICK_ACCESS
-			{ write_exp_elt_opcode (UNOP_ADDR); }
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
 	|	primary TICK_ADDRESS
-			{ write_exp_elt_opcode (UNOP_ADDR);
-			  write_exp_elt_opcode (UNOP_CAST);
-			  write_exp_elt_type (type_system_address ());
-			  write_exp_elt_opcode (UNOP_CAST);
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR);
+			  write_exp_elt_opcode (pstate, UNOP_CAST);
+			  write_exp_elt_type (pstate,
+					      type_system_address (pstate));
+			  write_exp_elt_opcode (pstate, UNOP_CAST);
 			}
 	|	primary TICK_FIRST tick_arglist
-			{ write_int ($3, type_int ());
-			  write_exp_elt_opcode (OP_ATR_FIRST); }
+			{ write_int (pstate, $3, type_int (pstate));
+			  write_exp_elt_opcode (pstate, OP_ATR_FIRST); }
 	|	primary TICK_LAST tick_arglist
-			{ write_int ($3, type_int ());
-			  write_exp_elt_opcode (OP_ATR_LAST); }
+			{ write_int (pstate, $3, type_int (pstate));
+			  write_exp_elt_opcode (pstate, OP_ATR_LAST); }
 	| 	primary TICK_LENGTH tick_arglist
-			{ write_int ($3, type_int ());
-			  write_exp_elt_opcode (OP_ATR_LENGTH); }
+			{ write_int (pstate, $3, type_int (pstate));
+			  write_exp_elt_opcode (pstate, OP_ATR_LENGTH); }
         |       primary TICK_SIZE
-			{ write_exp_elt_opcode (OP_ATR_SIZE); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_SIZE); }
 	|	primary TICK_TAG
-			{ write_exp_elt_opcode (OP_ATR_TAG); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_TAG); }
         |       opt_type_prefix TICK_MIN '(' exp ',' exp ')'
-			{ write_exp_elt_opcode (OP_ATR_MIN); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_MIN); }
         |       opt_type_prefix TICK_MAX '(' exp ',' exp ')'
-			{ write_exp_elt_opcode (OP_ATR_MAX); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_MAX); }
 	| 	opt_type_prefix TICK_POS '(' exp ')'
-			{ write_exp_elt_opcode (OP_ATR_POS); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_POS); }
 	|	type_prefix TICK_VAL '(' exp ')'
-			{ write_exp_elt_opcode (OP_ATR_VAL); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_VAL); }
 	|	type_prefix TICK_MODULUS
-			{ write_exp_elt_opcode (OP_ATR_MODULUS); }
+			{ write_exp_elt_opcode (pstate, OP_ATR_MODULUS); }
 	;
 
 tick_arglist :			%prec '('
@@ -565,53 +577,55 @@ type_prefix :
 			{ 
 			  if ($1 == NULL)
 			    error (_("Prefix must be type"));
-			  write_exp_elt_opcode (OP_TYPE);
-			  write_exp_elt_type ($1);
-			  write_exp_elt_opcode (OP_TYPE); }
+			  write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_TYPE); }
 	;
 
 opt_type_prefix :
 		type_prefix
 	| 	/* EMPTY */
-			{ write_exp_elt_opcode (OP_TYPE);
-			  write_exp_elt_type (parse_type->builtin_void);
-			  write_exp_elt_opcode (OP_TYPE); }
+			{ write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate,
+					  parse_type (pstate)->builtin_void);
+			  write_exp_elt_opcode (pstate, OP_TYPE); }
 	;
 
 
 primary	:	INT
-			{ write_int ((LONGEST) $1.val, $1.type); }
+			{ write_int (pstate, (LONGEST) $1.val, $1.type); }
 	;
 
 primary	:	CHARLIT
-                  { write_int (convert_char_literal (type_qualifier, $1.val),
+                  { write_int (pstate,
+			       convert_char_literal (type_qualifier, $1.val),
 			       (type_qualifier == NULL) 
 			       ? $1.type : type_qualifier);
 		  }
 	;
 
 primary	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_dblcst ($1.dval);
-			  write_exp_elt_opcode (OP_DOUBLE);
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_dblcst (pstate, $1.dval);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE);
 			}
 	;
 
 primary	:	NULL_PTR
-			{ write_int (0, type_int ()); }
+			{ write_int (pstate, 0, type_int (pstate)); }
 	;
 
 primary	:	STRING
 			{ 
-			  write_exp_op_with_string (OP_STRING, $1);
+			  write_exp_op_with_string (pstate, OP_STRING, $1);
 			}
 	;
 
 primary :	TRUEKEYWORD
-			{ write_int (1, type_boolean ()); }
+			{ write_int (pstate, 1, type_boolean (pstate)); }
         |	FALSEKEYWORD
-			{ write_int (0, type_boolean ()); }
+			{ write_int (pstate, 0, type_boolean (pstate)); }
 	;
 
 primary	: 	NEW NAME
@@ -619,22 +633,22 @@ primary	: 	NEW NAME
 	;
 
 var_or_type:	NAME   	    %prec VAR
-				{ $$ = write_var_or_type (NULL, $1); } 
+				{ $$ = write_var_or_type (pstate, NULL, $1); }
 	|	block NAME  %prec VAR
-                                { $$ = write_var_or_type ($1, $2); }
+                                { $$ = write_var_or_type (pstate, $1, $2); }
 	|       NAME TICK_ACCESS 
 			{ 
-			  $$ = write_var_or_type (NULL, $1);
+			  $$ = write_var_or_type (pstate, NULL, $1);
 			  if ($$ == NULL)
-			    write_exp_elt_opcode (UNOP_ADDR);
+			    write_exp_elt_opcode (pstate, UNOP_ADDR);
 			  else
 			    $$ = lookup_pointer_type ($$);
 			}
 	|	block NAME TICK_ACCESS
 			{ 
-			  $$ = write_var_or_type ($1, $2);
+			  $$ = write_var_or_type (pstate, $1, $2);
 			  if ($$ == NULL)
-			    write_exp_elt_opcode (UNOP_ADDR);
+			    write_exp_elt_opcode (pstate, UNOP_ADDR);
 			  else
 			    $$ = lookup_pointer_type ($$);
 			}
@@ -650,18 +664,18 @@ block   :       NAME COLONCOLON
 aggregate :
 		'(' aggregate_component_list ')'  
 			{
-			  write_exp_elt_opcode (OP_AGGREGATE);
-			  write_exp_elt_longcst ($2);
-			  write_exp_elt_opcode (OP_AGGREGATE);
+			  write_exp_elt_opcode (pstate, OP_AGGREGATE);
+			  write_exp_elt_longcst (pstate, $2);
+			  write_exp_elt_opcode (pstate, OP_AGGREGATE);
 		        }
 	;
 
 aggregate_component_list :
 		component_groups	 { $$ = $1; }
 	|	positional_list exp
-			{ write_exp_elt_opcode (OP_POSITIONAL);
-			  write_exp_elt_longcst ($1);
-			  write_exp_elt_opcode (OP_POSITIONAL);
+			{ write_exp_elt_opcode (pstate, OP_POSITIONAL);
+			  write_exp_elt_longcst (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_POSITIONAL);
 			  $$ = $1 + 1;
 			}
 	|	positional_list component_groups
@@ -670,15 +684,15 @@ aggregate_component_list :
 
 positional_list :
 		exp ','
-			{ write_exp_elt_opcode (OP_POSITIONAL);
-			  write_exp_elt_longcst (0);
-			  write_exp_elt_opcode (OP_POSITIONAL);
+			{ write_exp_elt_opcode (pstate, OP_POSITIONAL);
+			  write_exp_elt_longcst (pstate, 0);
+			  write_exp_elt_opcode (pstate, OP_POSITIONAL);
 			  $$ = 1;
 			} 
 	|	positional_list exp ','
-			{ write_exp_elt_opcode (OP_POSITIONAL);
-			  write_exp_elt_longcst ($1);
-			  write_exp_elt_opcode (OP_POSITIONAL);
+			{ write_exp_elt_opcode (pstate, OP_POSITIONAL);
+			  write_exp_elt_longcst (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_POSITIONAL);
 			  $$ = $1 + 1; 
 			}
 	;
@@ -691,15 +705,15 @@ component_groups:
 	;
 
 others 	:	OTHERS ARROW exp
-			{ write_exp_elt_opcode (OP_OTHERS); }
+			{ write_exp_elt_opcode (pstate, OP_OTHERS); }
 	;
 
 component_group :
 		component_associations
 			{
-			  write_exp_elt_opcode (OP_CHOICES);
-			  write_exp_elt_longcst ($1);
-			  write_exp_elt_opcode (OP_CHOICES);
+			  write_exp_elt_opcode (pstate, OP_CHOICES);
+			  write_exp_elt_longcst (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_CHOICES);
 		        }
 	;
 
@@ -710,22 +724,23 @@ component_group :
    resolved shift/reduce conflict. */
 component_associations :
 		NAME ARROW 
-			{ write_name_assoc ($1); }
+			{ write_name_assoc (pstate, $1); }
 		    exp	{ $$ = 1; }
 	|	simple_exp ARROW exp
 			{ $$ = 1; }
 	|	simple_exp DOTDOT simple_exp ARROW 
-			{ write_exp_elt_opcode (OP_DISCRETE_RANGE);
-			  write_exp_op_with_string (OP_NAME, empty_stoken);
+			{ write_exp_elt_opcode (pstate, OP_DISCRETE_RANGE);
+			  write_exp_op_with_string (pstate, OP_NAME,
+						    empty_stoken);
 			}
 		    exp { $$ = 1; }
 	|	NAME '|' 
-		        { write_name_assoc ($1); }
+		        { write_name_assoc (pstate, $1); }
 		    component_associations  { $$ = $4 + 1; }
 	|	simple_exp '|'  
 	            component_associations  { $$ = $3 + 1; }
 	|	simple_exp DOTDOT simple_exp '|'
-			{ write_exp_elt_opcode (OP_DISCRETE_RANGE); }
+			{ write_exp_elt_opcode (pstate, OP_DISCRETE_RANGE); }
 		    component_associations  { $$ = $6 + 1; }
 	;
 
@@ -733,11 +748,11 @@ component_associations :
    can't get used to Ada notation in GDB.  */
 
 primary	:	'*' primary		%prec '.'
-			{ write_exp_elt_opcode (UNOP_IND); }
+			{ write_exp_elt_opcode (pstate, UNOP_IND); }
 	|	'&' primary		%prec '.'
-			{ write_exp_elt_opcode (UNOP_ADDR); }
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
 	|	primary '[' exp ']'
-			{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 	;
 
 %%
@@ -768,14 +783,23 @@ static struct obstack temp_parse_space;
 #include "ada-lex.c"
 
 int
-ada_parse (void)
+ada_parse (struct parser_state *par_state)
 {
+  int result;
+  struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
   lexer_init (yyin);		/* (Re-)initialize lexer.  */
   type_qualifier = NULL;
   obstack_free (&temp_parse_space, NULL);
   obstack_init (&temp_parse_space);
 
-  return _ada_parse ();
+  result = yyparse ();
+  do_cleanups (c);
+  return result;
 }
 
 void
@@ -787,7 +811,8 @@ yyerror (char *msg)
 /* Emit expression to access an instance of SYM, in block BLOCK (if
  * non-NULL), and with :: qualification ORIG_LEFT_CONTEXT.  */
 static void
-write_var_from_sym (const struct block *orig_left_context,
+write_var_from_sym (struct parser_state *par_state,
+		    const struct block *orig_left_context,
 		    const struct block *block,
 		    struct symbol *sym)
 {
@@ -798,30 +823,31 @@ write_var_from_sym (const struct block *orig_left_context,
 	innermost_block = block;
     }
 
-  write_exp_elt_opcode (OP_VAR_VALUE);
-  write_exp_elt_block (block);
-  write_exp_elt_sym (sym);
-  write_exp_elt_opcode (OP_VAR_VALUE);
+  write_exp_elt_opcode (par_state, OP_VAR_VALUE);
+  write_exp_elt_block (par_state, block);
+  write_exp_elt_sym (par_state, sym);
+  write_exp_elt_opcode (par_state, OP_VAR_VALUE);
 }
 
 /* Write integer or boolean constant ARG of type TYPE.  */
 
 static void
-write_int (LONGEST arg, struct type *type)
+write_int (struct parser_state *par_state, LONGEST arg, struct type *type)
 {
-  write_exp_elt_opcode (OP_LONG);
-  write_exp_elt_type (type);
-  write_exp_elt_longcst (arg);
-  write_exp_elt_opcode (OP_LONG);
+  write_exp_elt_opcode (par_state, OP_LONG);
+  write_exp_elt_type (par_state, type);
+  write_exp_elt_longcst (par_state, arg);
+  write_exp_elt_opcode (par_state, OP_LONG);
 }
 
 /* Write an OPCODE, string, OPCODE sequence to the current expression.  */
 static void
-write_exp_op_with_string (enum exp_opcode opcode, struct stoken token)
+write_exp_op_with_string (struct parser_state *par_state,
+			  enum exp_opcode opcode, struct stoken token)
 {
-  write_exp_elt_opcode (opcode);
-  write_exp_string (token);
-  write_exp_elt_opcode (opcode);
+  write_exp_elt_opcode (par_state, opcode);
+  write_exp_string (par_state, token);
+  write_exp_elt_opcode (par_state, opcode);
 }
   
 /* Emit expression corresponding to the renamed object named 
@@ -836,7 +862,8 @@ write_exp_op_with_string (enum exp_opcode opcode, struct stoken token)
  * new encoding entirely (FIXME pnh 7/20/2007).  */
 
 static void
-write_object_renaming (const struct block *orig_left_context,
+write_object_renaming (struct parser_state *par_state,
+		       const struct block *orig_left_context,
 		       const char *renamed_entity, int renamed_entity_len,
 		       const char *renaming_expr, int max_depth)
 {
@@ -869,10 +896,11 @@ write_object_renaming (const struct block *orig_left_context,
 				&inner_renaming_expr))
       {
       case ADA_NOT_RENAMING:
-	write_var_from_sym (orig_left_context, sym_info.block, sym_info.sym);
+	write_var_from_sym (par_state, orig_left_context, sym_info.block,
+			    sym_info.sym);
 	break;
       case ADA_OBJECT_RENAMING:
-	write_object_renaming (sym_info.block,
+	write_object_renaming (par_state, sym_info.block,
 			       inner_renamed_entity, inner_renamed_entity_len,
 			       inner_renaming_expr, max_depth - 1);
 	break;
@@ -889,7 +917,7 @@ write_object_renaming (const struct block *orig_left_context,
       switch (*renaming_expr) {
       case 'A':
         renaming_expr += 1;
-        write_exp_elt_opcode (UNOP_IND);
+        write_exp_elt_opcode (par_state, UNOP_IND);
         break;
       case 'L':
 	slice_state = LOWER_BOUND;
@@ -903,10 +931,10 @@ write_object_renaming (const struct block *orig_left_context,
 	    if (next == renaming_expr)
 	      goto BadEncoding;
 	    renaming_expr = next;
-	    write_exp_elt_opcode (OP_LONG);
-	    write_exp_elt_type (type_int ());
-	    write_exp_elt_longcst ((LONGEST) val);
-	    write_exp_elt_opcode (OP_LONG);
+	    write_exp_elt_opcode (par_state, OP_LONG);
+	    write_exp_elt_type (par_state, type_int (par_state));
+	    write_exp_elt_longcst (par_state, (LONGEST) val);
+	    write_exp_elt_opcode (par_state, OP_LONG);
 	  }
 	else
 	  {
@@ -930,20 +958,20 @@ write_object_renaming (const struct block *orig_left_context,
 	    else if (SYMBOL_CLASS (index_sym_info.sym) == LOC_TYPEDEF)
 	      /* Index is an old-style renaming symbol.  */
 	      index_sym_info.block = orig_left_context;
-	    write_var_from_sym (NULL, index_sym_info.block,
+	    write_var_from_sym (par_state, NULL, index_sym_info.block,
 				index_sym_info.sym);
 	  }
 	if (slice_state == SIMPLE_INDEX)
 	  {
-	    write_exp_elt_opcode (OP_FUNCALL);
-	    write_exp_elt_longcst ((LONGEST) 1);
-	    write_exp_elt_opcode (OP_FUNCALL);
+	    write_exp_elt_opcode (par_state, OP_FUNCALL);
+	    write_exp_elt_longcst (par_state, (LONGEST) 1);
+	    write_exp_elt_opcode (par_state, OP_FUNCALL);
 	  }
 	else if (slice_state == LOWER_BOUND)
 	  slice_state = UPPER_BOUND;
 	else if (slice_state == UPPER_BOUND)
 	  {
-	    write_exp_elt_opcode (TERNOP_SLICE);
+	    write_exp_elt_opcode (par_state, TERNOP_SLICE);
 	    slice_state = SIMPLE_INDEX;
 	  }
 	break;
@@ -967,7 +995,7 @@ write_object_renaming (const struct block *orig_left_context,
 	  strncpy (buf, renaming_expr, end - renaming_expr);
 	  buf[end - renaming_expr] = '\000';
 	  renaming_expr = end;
-	  write_exp_op_with_string (STRUCTOP_STRUCT, field_name);
+	  write_exp_op_with_string (par_state, STRUCTOP_STRUCT, field_name);
 	  break;
 	}
 
@@ -1056,14 +1084,14 @@ select_possible_type_sym (struct ada_symbol_info *syms, int nsyms)
 }
 
 static struct type*
-find_primitive_type (char *name)
+find_primitive_type (struct parser_state *par_state, char *name)
 {
   struct type *type;
-  type = language_lookup_primitive_type_by_name (parse_language,
-						 parse_gdbarch,
+  type = language_lookup_primitive_type_by_name (parse_language (par_state),
+						 parse_gdbarch (par_state),
 						 name);
   if (type == NULL && strcmp ("system__address", name) == 0)
-    type = type_system_address ();
+    type = type_system_address (par_state);
 
   if (type != NULL)
     {
@@ -1112,7 +1140,7 @@ chop_separator (char *name)
    <sep> is '__' or '.', write the indicated sequence of
    STRUCTOP_STRUCT expression operators. */
 static void
-write_selectors (char *sels)
+write_selectors (struct parser_state *par_state, char *sels)
 {
   while (*sels != '\0')
     {
@@ -1124,7 +1152,7 @@ write_selectors (char *sels)
 	sels += 1;
       field_name.length = sels - p;
       field_name.ptr = p;
-      write_exp_op_with_string (STRUCTOP_STRUCT, field_name);
+      write_exp_op_with_string (par_state, STRUCTOP_STRUCT, field_name);
     }
 }
 
@@ -1133,7 +1161,8 @@ write_selectors (char *sels)
    a temporary symbol that is valid until the next call to ada_parse.
    */
 static void
-write_ambiguous_var (const struct block *block, char *name, int len)
+write_ambiguous_var (struct parser_state *par_state,
+		     const struct block *block, char *name, int len)
 {
   struct symbol *sym =
     obstack_alloc (&temp_parse_space, sizeof (struct symbol));
@@ -1142,10 +1171,10 @@ write_ambiguous_var (const struct block *block, char *name, int len)
   SYMBOL_LINKAGE_NAME (sym) = obstack_copy0 (&temp_parse_space, name, len);
   SYMBOL_LANGUAGE (sym) = language_ada;
 
-  write_exp_elt_opcode (OP_VAR_VALUE);
-  write_exp_elt_block (block);
-  write_exp_elt_sym (sym);
-  write_exp_elt_opcode (OP_VAR_VALUE);
+  write_exp_elt_opcode (par_state, OP_VAR_VALUE);
+  write_exp_elt_block (par_state, block);
+  write_exp_elt_sym (par_state, sym);
+  write_exp_elt_opcode (par_state, OP_VAR_VALUE);
 }
 
 /* A convenient wrapper around ada_get_field_index that takes
@@ -1225,7 +1254,8 @@ get_symbol_field_type (struct symbol *sym, char *encoded_field_name)
    identifier).  */
 
 static struct type*
-write_var_or_type (const struct block *block, struct stoken name0)
+write_var_or_type (struct parser_state *par_state,
+		   const struct block *block, struct stoken name0)
 {
   int depth;
   char *encoded_name;
@@ -1299,9 +1329,9 @@ write_var_or_type (const struct block *block, struct stoken name0)
 		goto TryAfterRenaming;
 	      }	
 	    case ADA_OBJECT_RENAMING:
-	      write_object_renaming (block, renaming, renaming_len, 
+	      write_object_renaming (par_state, block, renaming, renaming_len,
 				     renaming_expr, MAX_RENAMING_CHAIN_LENGTH);
-	      write_selectors (encoded_name + tail_index);
+	      write_selectors (par_state, encoded_name + tail_index);
 	      return NULL;
 	    default:
 	      internal_error (__FILE__, __LINE__,
@@ -1328,7 +1358,8 @@ write_var_or_type (const struct block *block, struct stoken name0)
 	    }
 	  else if (tail_index == name_len && nsyms == 0)
 	    {
-	      struct type *type = find_primitive_type (encoded_name);
+	      struct type *type = find_primitive_type (par_state,
+						       encoded_name);
 
 	      if (type != NULL)
 		return type;
@@ -1336,8 +1367,9 @@ write_var_or_type (const struct block *block, struct stoken name0)
 
 	  if (nsyms == 1)
 	    {
-	      write_var_from_sym (block, syms[0].block, syms[0].sym);
-	      write_selectors (encoded_name + tail_index);
+	      write_var_from_sym (par_state, block, syms[0].block,
+				  syms[0].sym);
+	      write_selectors (par_state, encoded_name + tail_index);
 	      return NULL;
 	    }
 	  else if (nsyms == 0) 
@@ -1346,9 +1378,9 @@ write_var_or_type (const struct block *block, struct stoken name0)
 		= ada_lookup_simple_minsym (encoded_name);
 	      if (msym.minsym != NULL)
 		{
-		  write_exp_msymbol (msym);
+		  write_exp_msymbol (par_state, msym);
 		  /* Maybe cause error here rather than later? FIXME? */
-		  write_selectors (encoded_name + tail_index);
+		  write_selectors (par_state, encoded_name + tail_index);
 		  return NULL;
 		}
 
@@ -1361,8 +1393,9 @@ write_var_or_type (const struct block *block, struct stoken name0)
 	    } 
 	  else
 	    {
-	      write_ambiguous_var (block, encoded_name, tail_index);
-	      write_selectors (encoded_name + tail_index);
+	      write_ambiguous_var (par_state, block, encoded_name,
+				   tail_index);
+	      write_selectors (par_state, encoded_name + tail_index);
 	      return NULL;
 	    }
 	}
@@ -1397,7 +1430,7 @@ write_var_or_type (const struct block *block, struct stoken name0)
    ambiguous name, one must write instead ((R) => 42). */
    
 static void
-write_name_assoc (struct stoken name)
+write_name_assoc (struct parser_state *par_state, struct stoken name)
 {
   if (strchr (name.ptr, '.') == NULL)
     {
@@ -1405,12 +1438,12 @@ write_name_assoc (struct stoken name)
       int nsyms = ada_lookup_symbol_list (name.ptr, expression_context_block,
 					  VAR_DOMAIN, &syms);
       if (nsyms != 1 || SYMBOL_CLASS (syms[0].sym) == LOC_TYPEDEF)
-	write_exp_op_with_string (OP_NAME, name);
+	write_exp_op_with_string (par_state, OP_NAME, name);
       else
-	write_var_from_sym (NULL, syms[0].block, syms[0].sym);
+	write_var_from_sym (par_state, NULL, syms[0].block, syms[0].sym);
     }
   else
-    if (write_var_or_type (NULL, name) != NULL)
+    if (write_var_or_type (par_state, NULL, name) != NULL)
       error (_("Invalid use of type."));
 }
 
@@ -1441,61 +1474,62 @@ convert_char_literal (struct type *type, LONGEST val)
 }
 
 static struct type *
-type_int (void)
+type_int (struct parser_state *par_state)
 {
-  return parse_type->builtin_int;
+  return parse_type (par_state)->builtin_int;
 }
 
 static struct type *
-type_long (void)
+type_long (struct parser_state *par_state)
 {
-  return parse_type->builtin_long;
+  return parse_type (par_state)->builtin_long;
 }
 
 static struct type *
-type_long_long (void)
+type_long_long (struct parser_state *par_state)
 {
-  return parse_type->builtin_long_long;
+  return parse_type (par_state)->builtin_long_long;
 }
 
 static struct type *
-type_float (void)
+type_float (struct parser_state *par_state)
 {
-  return parse_type->builtin_float;
+  return parse_type (par_state)->builtin_float;
 }
 
 static struct type *
-type_double (void)
+type_double (struct parser_state *par_state)
 {
-  return parse_type->builtin_double;
+  return parse_type (par_state)->builtin_double;
 }
 
 static struct type *
-type_long_double (void)
+type_long_double (struct parser_state *par_state)
 {
-  return parse_type->builtin_long_double;
+  return parse_type (par_state)->builtin_long_double;
 }
 
 static struct type *
-type_char (void)
+type_char (struct parser_state *par_state)
 {
-  return language_string_char_type (parse_language, parse_gdbarch);
+  return language_string_char_type (parse_language (par_state),
+				    parse_gdbarch (par_state));
 }
 
 static struct type *
-type_boolean (void)
+type_boolean (struct parser_state *par_state)
 {
-  return parse_type->builtin_bool;
+  return parse_type (par_state)->builtin_bool;
 }
 
 static struct type *
-type_system_address (void)
+type_system_address (struct parser_state *par_state)
 {
   struct type *type 
-    = language_lookup_primitive_type_by_name (parse_language,
-					      parse_gdbarch,
+    = language_lookup_primitive_type_by_name (parse_language (par_state),
+					      parse_gdbarch (par_state),
 					      "system__address");
-  return  type != NULL ? type : parse_type->builtin_data_ptr;
+  return  type != NULL ? type : parse_type (par_state)->builtin_data_ptr;
 }
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 38df182..71827ae 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -13376,10 +13376,10 @@ emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
 }
 
 static int
-parse (void)
+parse (struct parser_state *ps)
 {
   warnings_issued = 0;
-  return ada_parse ();
+  return ada_parse (ps);
 }
 
 static const struct exp_descriptor ada_exp_descriptor = {
diff --git a/gdb/ada-lang.h b/gdb/ada-lang.h
index c053278..6356cfa 100644
--- a/gdb/ada-lang.h
+++ b/gdb/ada-lang.h
@@ -23,6 +23,7 @@
 struct frame_info;
 struct inferior;
 struct type_print_options;
+struct parser_state;
 
 #include "value.h"
 #include "gdbtypes.h"
@@ -169,7 +170,7 @@ extern int ada_get_field_index (const struct type *type,
                                 const char *field_name,
                                 int maybe_missing);
 
-extern int ada_parse (void);    /* Defined in ada-exp.y */
+extern int ada_parse (struct parser_state *);    /* Defined in ada-exp.y */
 
 extern void ada_error (char *); /* Defined in ada-exp.y */
 
diff --git a/gdb/ada-lex.l b/gdb/ada-lex.l
index 0787a0f..9632073 100644
--- a/gdb/ada-lex.l
+++ b/gdb/ada-lex.l
@@ -48,8 +48,9 @@ POSEXP  (e"+"?{NUM10})
 static char numbuf[NUMERAL_WIDTH];
  static void canonicalizeNumeral (char *s1, const char *);
 static struct stoken processString (const char*, int);
-static int processInt (const char *, const char *, const char *);
-static int processReal (const char *);
+static int processInt (struct parser_state *, const char *, const char *,
+		       const char *);
+static int processReal (struct parser_state *, const char *);
 static struct stoken processId (const char *, int);
 static int processAttribute (const char *);
 static int find_dot_all (const char *);
@@ -89,40 +90,42 @@ static int find_dot_all (const char *);
 
 {NUM10}{POSEXP}  {
 		   canonicalizeNumeral (numbuf, yytext);
-		   return processInt (NULL, numbuf, strrchr(numbuf, 'e')+1);
+		   return processInt (pstate, NULL, numbuf,
+				      strrchr (numbuf, 'e') + 1);
 		 }
 
 {NUM10}          {
 		   canonicalizeNumeral (numbuf, yytext);
-		   return processInt (NULL, numbuf, NULL);
+		   return processInt (pstate, NULL, numbuf, NULL);
 		 }
 
 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {
 		   canonicalizeNumeral (numbuf, yytext);
-    		   return processInt (numbuf,
+		   return processInt (pstate, numbuf,
 				      strchr (numbuf, '#') + 1,
 				      strrchr(numbuf, '#') + 1);
 		 }
 
 {NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#" {
 		   canonicalizeNumeral (numbuf, yytext);
-    		   return processInt (numbuf, strchr (numbuf, '#') + 1, NULL);
+		   return processInt (pstate, numbuf, strchr (numbuf, '#') + 1,
+				      NULL);
 		 }
 
 "0x"{HEXDIG}+	{
 		  canonicalizeNumeral (numbuf, yytext+2);
-		  return processInt ("16#", numbuf, NULL);
+		  return processInt (pstate, "16#", numbuf, NULL);
 		}
 
 
 {NUM10}"."{NUM10}{EXP} {
 		   canonicalizeNumeral (numbuf, yytext);
-		   return processReal (numbuf);
+		   return processReal (pstate, numbuf);
 		}
 
 {NUM10}"."{NUM10} {
 		   canonicalizeNumeral (numbuf, yytext);
-		   return processReal (numbuf);
+		   return processReal (pstate, numbuf);
 		}
 
 {NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {
@@ -134,14 +137,14 @@ static int find_dot_all (const char *);
 		}
 
 <INITIAL>"'"({GRAPHIC}|\")"'" {
-		   yylval.typed_val.type = type_char ();
+		   yylval.typed_val.type = type_char (pstate);
 		   yylval.typed_val.val = yytext[1];
 		   return CHARLIT;
 		}
 
 <INITIAL>"'[\""{HEXDIG}{2}"\"]'"   {
                    int v;
-                   yylval.typed_val.type = type_char ();
+                   yylval.typed_val.type = type_char (pstate);
 		   sscanf (yytext+3, "%2x", &v);
 		   yylval.typed_val.val = v;
 		   return CHARLIT;
@@ -324,7 +327,8 @@ canonicalizeNumeral (char *s1, const char *s2)
  */
 
 static int
-processInt (const char *base0, const char *num0, const char *exp0)
+processInt (struct parser_state *par_state, const char *base0,
+	    const char *num0, const char *exp0)
 {
   ULONGEST result;
   long exp;
@@ -360,11 +364,11 @@ processInt (const char *base0, const char *num0, const char *exp0)
       exp -= 1;
     }
 
-  if ((result >> (gdbarch_int_bit (parse_gdbarch)-1)) == 0)
-    yylval.typed_val.type = type_int ();
-  else if ((result >> (gdbarch_long_bit (parse_gdbarch)-1)) == 0)
-    yylval.typed_val.type = type_long ();
-  else if (((result >> (gdbarch_long_bit (parse_gdbarch)-1)) >> 1) == 0)
+  if ((result >> (gdbarch_int_bit (parse_gdbarch (par_state))-1)) == 0)
+    yylval.typed_val.type = type_int (par_state);
+  else if ((result >> (gdbarch_long_bit (parse_gdbarch (par_state))-1)) == 0)
+    yylval.typed_val.type = type_long (par_state);
+  else if (((result >> (gdbarch_long_bit (parse_gdbarch (par_state))-1)) >> 1) == 0)
     {
       /* We have a number representable as an unsigned integer quantity.
          For consistency with the C treatment, we will treat it as an
@@ -374,7 +378,7 @@ processInt (const char *base0, const char *num0, const char *exp0)
          assignment does the trick (no, it doesn't; read the reference manual).
        */
       yylval.typed_val.type
-	= builtin_type (parse_gdbarch)->builtin_unsigned_long;
+	= builtin_type (parse_gdbarch (par_state))->builtin_unsigned_long;
       if (result & LONGEST_SIGN)
 	yylval.typed_val.val =
 	  (LONGEST) (result & ~LONGEST_SIGN)
@@ -384,24 +388,24 @@ processInt (const char *base0, const char *num0, const char *exp0)
       return INT;
     }
   else
-    yylval.typed_val.type = type_long_long ();
+    yylval.typed_val.type = type_long_long (par_state);
 
   yylval.typed_val.val = (LONGEST) result;
   return INT;
 }
 
 static int
-processReal (const char *num0)
+processReal (struct parser_state *par_state, const char *num0)
 {
   sscanf (num0, "%" DOUBLEST_SCAN_FORMAT, &yylval.typed_val_float.dval);
 
-  yylval.typed_val_float.type = type_float ();
-  if (sizeof(DOUBLEST) >= gdbarch_double_bit (parse_gdbarch)
+  yylval.typed_val_float.type = type_float (par_state);
+  if (sizeof(DOUBLEST) >= gdbarch_double_bit (parse_gdbarch (par_state))
 			    / TARGET_CHAR_BIT)
-    yylval.typed_val_float.type = type_double ();
-  if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (parse_gdbarch)
+    yylval.typed_val_float.type = type_double (par_state);
+  if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (parse_gdbarch (par_state))
 			    / TARGET_CHAR_BIT)
-    yylval.typed_val_float.type = type_long_double ();
+    yylval.typed_val_float.type = type_long_double (par_state);
 
   return FLOAT;
 }
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index de0c211..98b912b 100644
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -1206,28 +1206,28 @@ arm_stap_parse_special_token (struct gdbarch *gdbarch,
 	return 0;
 
       /* The displacement.  */
-      write_exp_elt_opcode (OP_LONG);
-      write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-      write_exp_elt_longcst (displacement);
-      write_exp_elt_opcode (OP_LONG);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
+      write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
+      write_exp_elt_longcst (&p->pstate, displacement);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
       if (got_minus)
-	write_exp_elt_opcode (UNOP_NEG);
+	write_exp_elt_opcode (&p->pstate, UNOP_NEG);
 
       /* The register name.  */
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       str.ptr = regname;
       str.length = len;
-      write_exp_string (str);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, str);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
-      write_exp_elt_opcode (BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
       /* Casting to the expected type.  */
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (lookup_pointer_type (p->arg_type));
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate, lookup_pointer_type (p->arg_type));
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (UNOP_IND);
+      write_exp_elt_opcode (&p->pstate, UNOP_IND);
 
       p->arg = tmp;
     }
diff --git a/gdb/c-exp.y b/gdb/c-exp.y
index 11631ba..fc79807 100644
--- a/gdb/c-exp.y
+++ b/gdb/c-exp.y
@@ -56,7 +56,7 @@
 #include "typeprint.h"
 #include "cp-abi.h"
 
-#define parse_type builtin_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -118,6 +118,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -164,10 +169,12 @@ void yyerror (char *);
 
 %{
 /* YYSTYPE gets defined by %union */
-static int parse_number (const char *, int, int, YYSTYPE *);
+static int parse_number (struct parser_state *par_state,
+			 const char *, int, int, YYSTYPE *);
 static struct stoken operator_stoken (const char *);
 static void check_parameter_typelist (VEC (type_ptr) *);
-static void write_destructor_name (struct stoken);
+static void write_destructor_name (struct parser_state *par_state,
+				   struct stoken);
 
 #ifdef YYBISON
 static void c_print_token (FILE *file, int type, YYSTYPE value);
@@ -283,186 +290,186 @@ start   :	exp1
 	;
 
 type_exp:	type
-			{ write_exp_elt_opcode(OP_TYPE);
-			  write_exp_elt_type($1);
-			  write_exp_elt_opcode(OP_TYPE);}
+			{ write_exp_elt_opcode(pstate, OP_TYPE);
+			  write_exp_elt_type(pstate, $1);
+			  write_exp_elt_opcode(pstate, OP_TYPE);}
 	|	TYPEOF '(' exp ')'
 			{
-			  write_exp_elt_opcode (OP_TYPEOF);
+			  write_exp_elt_opcode (pstate, OP_TYPEOF);
 			}
 	|	TYPEOF '(' type ')'
 			{
-			  write_exp_elt_opcode (OP_TYPE);
-			  write_exp_elt_type ($3);
-			  write_exp_elt_opcode (OP_TYPE);
+			  write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate, $3);
+			  write_exp_elt_opcode (pstate, OP_TYPE);
 			}
 	|	DECLTYPE '(' exp ')'
 			{
-			  write_exp_elt_opcode (OP_DECLTYPE);
+			  write_exp_elt_opcode (pstate, OP_DECLTYPE);
 			}
 	;
 
 /* Expressions, including the comma operator.  */
 exp1	:	exp
 	|	exp1 ',' exp
-			{ write_exp_elt_opcode (BINOP_COMMA); }
+			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
 	;
 
 /* Expressions, not including the comma operator.  */
 exp	:	'*' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_IND); }
+			{ write_exp_elt_opcode (pstate, UNOP_IND); }
 	;
 
 exp	:	'&' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_ADDR); }
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
 	;
 
 exp	:	'-' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_NEG); }
+			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 exp	:	'+' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PLUS); }
+			{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
 	;
 
 exp	:	'!' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 exp	:	'~' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_COMPLEMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
 	;
 
 exp	:	INCREMENT exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PREINCREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
 	;
 
 exp	:	DECREMENT exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PREDECREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
 	;
 
 exp	:	exp INCREMENT    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_POSTINCREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
 	;
 
 exp	:	exp DECREMENT    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_POSTDECREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
 	;
 
 exp	:	TYPEID '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (OP_TYPEID); }
+			{ write_exp_elt_opcode (pstate, OP_TYPEID); }
 	;
 
 exp	:	TYPEID '(' type_exp ')' %prec UNARY
-			{ write_exp_elt_opcode (OP_TYPEID); }
+			{ write_exp_elt_opcode (pstate, OP_TYPEID); }
 	;
 
 exp	:	SIZEOF exp       %prec UNARY
-			{ write_exp_elt_opcode (UNOP_SIZEOF); }
+			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
 	;
 
 exp	:	exp ARROW name
-			{ write_exp_elt_opcode (STRUCTOP_PTR);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (STRUCTOP_PTR); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
 	;
 
 exp	:	exp ARROW name COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_PTR);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (STRUCTOP_PTR); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
 	;
 
 exp	:	exp ARROW COMPLETE
 			{ struct stoken s;
-			  mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_PTR);
+			  mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
 			  s.ptr = "";
 			  s.length = 0;
-			  write_exp_string (s);
-			  write_exp_elt_opcode (STRUCTOP_PTR); }
+			  write_exp_string (pstate, s);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
 	;
 
 exp	:	exp ARROW '~' name
-			{ write_exp_elt_opcode (STRUCTOP_PTR);
-			  write_destructor_name ($4);
-			  write_exp_elt_opcode (STRUCTOP_PTR); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			  write_destructor_name (pstate, $4);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
 	;
 
 exp	:	exp ARROW '~' name COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_PTR);
-			  write_destructor_name ($4);
-			  write_exp_elt_opcode (STRUCTOP_PTR); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			  write_destructor_name (pstate, $4);
+			  write_exp_elt_opcode (pstate, STRUCTOP_PTR); }
 	;
 
 exp	:	exp ARROW qualified_name
 			{ /* exp->type::name becomes exp->*(&type::name) */
 			  /* Note: this doesn't work if name is a
 			     static member!  FIXME */
-			  write_exp_elt_opcode (UNOP_ADDR);
-			  write_exp_elt_opcode (STRUCTOP_MPTR); }
+			  write_exp_elt_opcode (pstate, UNOP_ADDR);
+			  write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
 	;
 
 exp	:	exp ARROW_STAR exp
-			{ write_exp_elt_opcode (STRUCTOP_MPTR); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_MPTR); }
 	;
 
 exp	:	exp '.' name
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' name COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' COMPLETE
 			{ struct stoken s;
-			  mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
+			  mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			  s.ptr = "";
 			  s.length = 0;
-			  write_exp_string (s);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			  write_exp_string (pstate, s);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' '~' name
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_destructor_name ($4);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_destructor_name (pstate, $4);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' '~' name COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_destructor_name ($4);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_destructor_name (pstate, $4);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' qualified_name
 			{ /* exp.type::name becomes exp.*(&type::name) */
 			  /* Note: this doesn't work if name is a
 			     static member!  FIXME */
-			  write_exp_elt_opcode (UNOP_ADDR);
-			  write_exp_elt_opcode (STRUCTOP_MEMBER); }
+			  write_exp_elt_opcode (pstate, UNOP_ADDR);
+			  write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
 	;
 
 exp	:	exp DOT_STAR exp
-			{ write_exp_elt_opcode (STRUCTOP_MEMBER); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_MEMBER); }
 	;
 
 exp	:	exp '[' exp1 ']'
-			{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 	;
 
 exp	:	exp OBJC_LBRAC exp1 ']'
-			{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 	;
 
 /*
@@ -474,45 +481,47 @@ exp	: 	OBJC_LBRAC TYPENAME
 			{
 			  CORE_ADDR class;
 
-			  class = lookup_objc_class (parse_gdbarch,
+			  class = lookup_objc_class (parse_gdbarch (pstate),
 						     copy_name ($2.stoken));
 			  if (class == 0)
 			    error (_("%s is not an ObjC Class"),
 				   copy_name ($2.stoken));
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_type->builtin_int);
-			  write_exp_elt_longcst ((LONGEST) class);
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					    parse_type (pstate)->builtin_int);
+			  write_exp_elt_longcst (pstate, (LONGEST) class);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			  start_msglist();
 			}
 		msglist ']'
-			{ write_exp_elt_opcode (OP_OBJC_MSGCALL);
-			  end_msglist();
-			  write_exp_elt_opcode (OP_OBJC_MSGCALL);
+			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
+			  end_msglist (pstate);
+			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
 			}
 	;
 
 exp	:	OBJC_LBRAC CLASSNAME
 			{
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_type->builtin_int);
-			  write_exp_elt_longcst ((LONGEST) $2.class);
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					    parse_type (pstate)->builtin_int);
+			  write_exp_elt_longcst (pstate, (LONGEST) $2.class);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			  start_msglist();
 			}
 		msglist ']'
-			{ write_exp_elt_opcode (OP_OBJC_MSGCALL);
-			  end_msglist();
-			  write_exp_elt_opcode (OP_OBJC_MSGCALL);
+			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
+			  end_msglist (pstate);
+			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
 			}
 	;
 
 exp	:	OBJC_LBRAC exp
 			{ start_msglist(); }
 		msglist ']'
-			{ write_exp_elt_opcode (OP_OBJC_MSGCALL);
-			  end_msglist();
-			  write_exp_elt_opcode (OP_OBJC_MSGCALL);
+			{ write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
+			  end_msglist (pstate);
+			  write_exp_elt_opcode (pstate, OP_OBJC_MSGCALL);
 			}
 	;
 
@@ -538,20 +547,23 @@ exp	:	exp '('
 			   being accumulated by an outer function call.  */
 			{ start_arglist (); }
 		arglist ')'	%prec ARROW
-			{ write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_FUNCALL); }
+			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate, OP_FUNCALL); }
 	;
 
 exp	:	UNKNOWN_CPP_NAME '('
 			{
 			  /* This could potentially be a an argument defined
 			     lookup function (Koenig).  */
-			  write_exp_elt_opcode (OP_ADL_FUNC);
-			  write_exp_elt_block (expression_context_block);
-			  write_exp_elt_sym (NULL); /* Placeholder.  */
-			  write_exp_string ($1.stoken);
-			  write_exp_elt_opcode (OP_ADL_FUNC);
+			  write_exp_elt_opcode (pstate, OP_ADL_FUNC);
+			  write_exp_elt_block (pstate,
+					       expression_context_block);
+			  write_exp_elt_sym (pstate,
+					     NULL); /* Placeholder.  */
+			  write_exp_string (pstate, $1.stoken);
+			  write_exp_elt_opcode (pstate, OP_ADL_FUNC);
 
 			/* This is to save the value of arglist_len
 			   being accumulated by an outer function call.  */
@@ -560,9 +572,10 @@ exp	:	UNKNOWN_CPP_NAME '('
 			}
 		arglist ')'	%prec ARROW
 			{
-			  write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_FUNCALL);
+			  write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate, OP_FUNCALL);
 			}
 	;
 
@@ -587,14 +600,14 @@ exp     :       exp '(' parameter_typelist ')' const_or_volatile
 			  struct type *type_elt;
 			  LONGEST len = VEC_length (type_ptr, type_list);
 
-			  write_exp_elt_opcode (TYPE_INSTANCE);
-			  write_exp_elt_longcst (len);
+			  write_exp_elt_opcode (pstate, TYPE_INSTANCE);
+			  write_exp_elt_longcst (pstate, len);
 			  for (i = 0;
 			       VEC_iterate (type_ptr, type_list, i, type_elt);
 			       ++i)
-			    write_exp_elt_type (type_elt);
-			  write_exp_elt_longcst(len);
-			  write_exp_elt_opcode (TYPE_INSTANCE);
+			    write_exp_elt_type (pstate, type_elt);
+			  write_exp_elt_longcst(pstate, len);
+			  write_exp_elt_opcode (pstate, TYPE_INSTANCE);
 			  VEC_free (type_ptr, type_list);
 			}
 	;
@@ -603,18 +616,18 @@ rcurly	:	'}'
 			{ $$ = end_arglist () - 1; }
 	;
 exp	:	lcurly arglist rcurly	%prec ARROW
-			{ write_exp_elt_opcode (OP_ARRAY);
-			  write_exp_elt_longcst ((LONGEST) 0);
-			  write_exp_elt_longcst ((LONGEST) $3);
-			  write_exp_elt_opcode (OP_ARRAY); }
+			{ write_exp_elt_opcode (pstate, OP_ARRAY);
+			  write_exp_elt_longcst (pstate, (LONGEST) 0);
+			  write_exp_elt_longcst (pstate, (LONGEST) $3);
+			  write_exp_elt_opcode (pstate, OP_ARRAY); }
 	;
 
 exp	:	lcurly type_exp rcurly exp  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_MEMVAL_TYPE); }
+			{ write_exp_elt_opcode (pstate, UNOP_MEMVAL_TYPE); }
 	;
 
 exp	:	'(' type_exp ')' exp  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_CAST_TYPE); }
+			{ write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
 	;
 
 exp	:	'(' exp1 ')'
@@ -624,100 +637,101 @@ exp	:	'(' exp1 ')'
 /* Binary operators in order of decreasing precedence.  */
 
 exp	:	exp '@' exp
-			{ write_exp_elt_opcode (BINOP_REPEAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
 	;
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 exp	:	exp '/' exp
-			{ write_exp_elt_opcode (BINOP_DIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 	;
 
 exp	:	exp '%' exp
-			{ write_exp_elt_opcode (BINOP_REM); }
+			{ write_exp_elt_opcode (pstate, BINOP_REM); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 exp	:	exp LSH exp
-			{ write_exp_elt_opcode (BINOP_LSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
 	;
 
 exp	:	exp RSH exp
-			{ write_exp_elt_opcode (BINOP_RSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
 	;
 
 exp	:	exp EQUAL exp
-			{ write_exp_elt_opcode (BINOP_EQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (BINOP_LEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (BINOP_GEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 	;
 
 exp	:	exp '<' exp
-			{ write_exp_elt_opcode (BINOP_LESS); }
+			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 	;
 
 exp	:	exp '>' exp
-			{ write_exp_elt_opcode (BINOP_GTR); }
+			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 	;
 
 exp	:	exp '&' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	;
 
 exp	:	exp '^' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 	;
 
 exp	:	exp '|' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	;
 
 exp	:	exp ANDAND exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 	;
 
 exp	:	exp OROR exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 	;
 
 exp	:	exp '?' exp ':' exp	%prec '?'
-			{ write_exp_elt_opcode (TERNOP_COND); }
+			{ write_exp_elt_opcode (pstate, TERNOP_COND); }
 	;
 			  
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 exp	:	exp ASSIGN_MODIFY exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode ($2);
-			  write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+			  write_exp_elt_opcode (pstate, $2);
+			  write_exp_elt_opcode (pstate,
+						BINOP_ASSIGN_MODIFY); }
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_longcst ((LONGEST)($1.val));
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	CHAR
@@ -725,33 +739,35 @@ exp	:	CHAR
 			  struct stoken_vector vec;
 			  vec.len = 1;
 			  vec.tokens = &$1;
-			  write_exp_string_vector ($1.type, &vec);
+			  write_exp_string_vector (pstate, $1.type, &vec);
 			}
 	;
 
 exp	:	NAME_OR_INT
 			{ YYSTYPE val;
-			  parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (val.typed_val_int.type);
-			  write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
-			  write_exp_elt_opcode (OP_LONG);
+			  parse_number (pstate, $1.stoken.ptr,
+					$1.stoken.length, 0, &val);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, val.typed_val_int.type);
+			  write_exp_elt_longcst (pstate,
+					    (LONGEST) val.typed_val_int.val);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			}
 	;
 
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_dblcst ($1.dval);
-			  write_exp_elt_opcode (OP_DOUBLE); }
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_dblcst (pstate, $1.dval);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 	;
 
 exp	:	DECFLOAT
-			{ write_exp_elt_opcode (OP_DECFLOAT);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_decfloatcst ($1.val);
-			  write_exp_elt_opcode (OP_DECFLOAT); }
+			{ write_exp_elt_opcode (pstate, OP_DECFLOAT);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_decfloatcst (pstate, $1.val);
+			  write_exp_elt_opcode (pstate, OP_DECFLOAT); }
 	;
 
 exp	:	variable
@@ -759,43 +775,46 @@ exp	:	variable
 
 exp	:	VARIABLE
 			{
-			  write_dollar_variable ($1);
+			  write_dollar_variable (pstate, $1);
 			}
 	;
 
 exp	:	SELECTOR '(' name ')'
 			{
-			  write_exp_elt_opcode (OP_OBJC_SELECTOR);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (OP_OBJC_SELECTOR); }
+			  write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, OP_OBJC_SELECTOR); }
 	;
 
 exp	:	SIZEOF '(' type ')'	%prec UNARY
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (lookup_signed_typename
-					      (parse_language, parse_gdbarch,
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, lookup_signed_typename
+					      (parse_language (pstate),
+					       parse_gdbarch (pstate),
 					       "int"));
 			  CHECK_TYPEDEF ($3);
-			  write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
-			  write_exp_elt_opcode (OP_LONG); }
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) TYPE_LENGTH ($3));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (UNOP_REINTERPRET_CAST); }
+			{ write_exp_elt_opcode (pstate,
+						UNOP_REINTERPRET_CAST); }
 	;
 
 exp	:	STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (UNOP_CAST_TYPE); }
+			{ write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
 	;
 
 exp	:	DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
-			{ write_exp_elt_opcode (UNOP_DYNAMIC_CAST); }
+			{ write_exp_elt_opcode (pstate, UNOP_DYNAMIC_CAST); }
 	;
 
 exp	:	CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
 			{ /* We could do more error checking here, but
 			     it doesn't seem worthwhile.  */
-			  write_exp_elt_opcode (UNOP_CAST_TYPE); }
+			  write_exp_elt_opcode (pstate, UNOP_CAST_TYPE); }
 	;
 
 string_exp:
@@ -860,7 +879,7 @@ exp	:	string_exp
 				}
 			    }
 
-			  write_exp_string_vector (type, &$1);
+			  write_exp_string_vector (pstate, type, &$1);
 			  for (i = 0; i < $1.len; ++i)
 			    free ($1.tokens[i].ptr);
 			  free ($1.tokens);
@@ -870,24 +889,26 @@ exp	:	string_exp
 exp     :	NSSTRING	/* ObjC NextStep NSString constant
 				 * of the form '@' '"' string '"'.
 				 */
-			{ write_exp_elt_opcode (OP_OBJC_NSSTRING);
-			  write_exp_string ($1);
-			  write_exp_elt_opcode (OP_OBJC_NSSTRING); }
+			{ write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING);
+			  write_exp_string (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_OBJC_NSSTRING); }
 	;
 
 /* C++.  */
 exp     :       TRUEKEYWORD    
-                        { write_exp_elt_opcode (OP_LONG);
-                          write_exp_elt_type (parse_type->builtin_bool);
-                          write_exp_elt_longcst ((LONGEST) 1);
-                          write_exp_elt_opcode (OP_LONG); }
+                        { write_exp_elt_opcode (pstate, OP_LONG);
+                          write_exp_elt_type (pstate,
+					  parse_type (pstate)->builtin_bool);
+                          write_exp_elt_longcst (pstate, (LONGEST) 1);
+                          write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp     :       FALSEKEYWORD   
-                        { write_exp_elt_opcode (OP_LONG);
-                          write_exp_elt_type (parse_type->builtin_bool);
-                          write_exp_elt_longcst ((LONGEST) 0);
-                          write_exp_elt_opcode (OP_LONG); }
+                        { write_exp_elt_opcode (pstate, OP_LONG);
+                          write_exp_elt_type (pstate,
+					  parse_type (pstate)->builtin_bool);
+                          write_exp_elt_longcst (pstate, (LONGEST) 0);
+                          write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 /* end of C++.  */
@@ -925,9 +946,9 @@ variable:	name_not_typename ENTRY
 				     "parameters, not for \"%s\""),
 				   copy_name ($1.stoken));
 
-			  write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
-			  write_exp_elt_sym (sym);
-			  write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
+			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
+			  write_exp_elt_sym (pstate, sym);
+			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
 			}
 	;
 
@@ -946,11 +967,11 @@ variable:	block COLONCOLON name
 				innermost_block = block_found;
 			    }
 
-			  write_exp_elt_opcode (OP_VAR_VALUE);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			  /* block_found is set by lookup_symbol.  */
-			  write_exp_elt_block (block_found);
-			  write_exp_elt_sym (sym);
-			  write_exp_elt_opcode (OP_VAR_VALUE); }
+			  write_exp_elt_block (pstate, block_found);
+			  write_exp_elt_sym (pstate, sym);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
 	;
 
 qualified_name:	TYPENAME COLONCOLON name
@@ -963,10 +984,10 @@ qualified_name:	TYPENAME COLONCOLON name
 			    error (_("`%s' is not defined as an aggregate type."),
 				   TYPE_SAFE_NAME (type));
 
-			  write_exp_elt_opcode (OP_SCOPE);
-			  write_exp_elt_type (type);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (OP_SCOPE);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
+			  write_exp_elt_type (pstate, type);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
 			}
 	|	TYPENAME COLONCOLON '~' name
 			{
@@ -989,10 +1010,10 @@ qualified_name:	TYPENAME COLONCOLON name
 
 			  /* Check for valid destructor name.  */
 			  destructor_name_p (tmp_token.ptr, $1.type);
-			  write_exp_elt_opcode (OP_SCOPE);
-			  write_exp_elt_type (type);
-			  write_exp_string (tmp_token);
-			  write_exp_elt_opcode (OP_SCOPE);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
+			  write_exp_elt_type (pstate, type);
+			  write_exp_string (pstate, tmp_token);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
 			}
 	|	TYPENAME COLONCOLON name COLONCOLON name
 			{
@@ -1015,16 +1036,16 @@ variable:	qualified_name
 					   VAR_DOMAIN, NULL);
 			  if (sym)
 			    {
-			      write_exp_elt_opcode (OP_VAR_VALUE);
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      break;
 			    }
 
 			  msymbol = lookup_bound_minimal_symbol (name);
 			  if (msymbol.minsym != NULL)
-			    write_exp_msymbol (msymbol);
+			    write_exp_msymbol (pstate, msymbol);
 			  else if (!have_full_symbols () && !have_partial_symbols ())
 			    error (_("No symbol table is loaded.  Use the \"file\" command."));
 			  else
@@ -1045,13 +1066,13 @@ variable:	name_not_typename
 				    innermost_block = block_found;
 				}
 
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to
 				 be in the same block.  */
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			    }
 			  else if ($1.is_a_field_of_this)
 			    {
@@ -1062,11 +1083,11 @@ variable:	name_not_typename
 				  || contained_in (block_found,
 						   innermost_block))
 				innermost_block = block_found;
-			      write_exp_elt_opcode (OP_THIS);
-			      write_exp_elt_opcode (OP_THIS);
-			      write_exp_elt_opcode (STRUCTOP_PTR);
-			      write_exp_string ($1.stoken);
-			      write_exp_elt_opcode (STRUCTOP_PTR);
+			      write_exp_elt_opcode (pstate, OP_THIS);
+			      write_exp_elt_opcode (pstate, OP_THIS);
+			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			      write_exp_string (pstate, $1.stoken);
+			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
 			    }
 			  else
 			    {
@@ -1076,7 +1097,7 @@ variable:	name_not_typename
 			      msymbol =
 				lookup_bound_minimal_symbol (arg);
 			      if (msymbol.minsym != NULL)
-				write_exp_msymbol (msymbol);
+				write_exp_msymbol (pstate, msymbol);
 			      else if (!have_full_symbols () && !have_partial_symbols ())
 				error (_("No symbol table is loaded.  Use the \"file\" command."));
 			      else
@@ -1087,7 +1108,7 @@ variable:	name_not_typename
 	;
 
 space_identifier : '@' NAME
-		{ insert_type_address_space (copy_name ($2.stoken)); }
+		{ insert_type_address_space (pstate, copy_name ($2.stoken)); }
 	;
 
 const_or_volatile: const_or_volatile_noopt
@@ -1194,117 +1215,121 @@ typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 	:	TYPENAME
 			{ $$ = $1.type; }
 	|	INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "int"); }
 	|	LONG
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long"); }
 	|	SHORT
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "short"); }
 	|	LONG INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long"); }
 	|	LONG SIGNED_KEYWORD INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long"); }
 	|	LONG SIGNED_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long"); }
 	|	SIGNED_KEYWORD LONG INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long"); }
 	|	UNSIGNED LONG INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long"); }
 	|	LONG UNSIGNED INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long"); }
 	|	LONG UNSIGNED
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long"); }
 	|	LONG LONG
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	LONG LONG INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	LONG LONG SIGNED_KEYWORD INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	LONG LONG SIGNED_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	SIGNED_KEYWORD LONG LONG
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	SIGNED_KEYWORD LONG LONG INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "long long"); }
 	|	UNSIGNED LONG LONG
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long long"); }
 	|	UNSIGNED LONG LONG INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long long"); }
 	|	LONG LONG UNSIGNED
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long long"); }
 	|	LONG LONG UNSIGNED INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "long long"); }
 	|	SHORT INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "short"); }
 	|	SHORT SIGNED_KEYWORD INT_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "short"); }
 	|	SHORT SIGNED_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "short"); }
 	|	UNSIGNED SHORT INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "short"); }
 	|	SHORT UNSIGNED 
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "short"); }
 	|	SHORT UNSIGNED INT_KEYWORD
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "short"); }
 	|	DOUBLE_KEYWORD
-			{ $$ = lookup_typename (parse_language, parse_gdbarch,
-						"double", (struct block *) NULL,
+			{ $$ = lookup_typename (parse_language (pstate),
+						parse_gdbarch (pstate),
+						"double",
+						(struct block *) NULL,
 						0); }
 	|	LONG DOUBLE_KEYWORD
-			{ $$ = lookup_typename (parse_language, parse_gdbarch,
+			{ $$ = lookup_typename (parse_language (pstate),
+						parse_gdbarch (pstate),
 						"long double",
-						(struct block *) NULL, 0); }
+						(struct block *) NULL,
+						0); }
 	|	STRUCT name
 			{ $$ = lookup_struct (copy_name ($2),
 					      expression_context_block); }
@@ -1362,20 +1387,20 @@ typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 			  $$ = NULL;
 			}
 	|	UNSIGNED typename
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 TYPE_NAME($2.type)); }
 	|	UNSIGNED
-			{ $$ = lookup_unsigned_typename (parse_language,
-							 parse_gdbarch,
+			{ $$ = lookup_unsigned_typename (parse_language (pstate),
+							 parse_gdbarch (pstate),
 							 "int"); }
 	|	SIGNED_KEYWORD typename
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       TYPE_NAME($2.type)); }
 	|	SIGNED_KEYWORD
-			{ $$ = lookup_signed_typename (parse_language,
-						       parse_gdbarch,
+			{ $$ = lookup_signed_typename (parse_language (pstate),
+						       parse_gdbarch (pstate),
 						       "int"); }
                 /* It appears that this rule for templates is never
                    reduced; template recognition happens by lookahead
@@ -1395,24 +1420,24 @@ typename:	TYPENAME
 		{
 		  $$.stoken.ptr = "int";
 		  $$.stoken.length = 3;
-		  $$.type = lookup_signed_typename (parse_language,
-						    parse_gdbarch,
+		  $$.type = lookup_signed_typename (parse_language (pstate),
+						    parse_gdbarch (pstate),
 						    "int");
 		}
 	|	LONG
 		{
 		  $$.stoken.ptr = "long";
 		  $$.stoken.length = 4;
-		  $$.type = lookup_signed_typename (parse_language,
-						    parse_gdbarch,
+		  $$.type = lookup_signed_typename (parse_language (pstate),
+						    parse_gdbarch (pstate),
 						    "long");
 		}
 	|	SHORT
 		{
 		  $$.stoken.ptr = "short";
 		  $$.stoken.length = 5;
-		  $$.type = lookup_signed_typename (parse_language,
-						    parse_gdbarch,
+		  $$.type = lookup_signed_typename (parse_language (pstate),
+						    parse_gdbarch (pstate),
 						    "short");
 		}
 	;
@@ -1635,7 +1660,7 @@ name_not_typename :	NAME
 /* Like write_exp_string, but prepends a '~'.  */
 
 static void
-write_destructor_name (struct stoken token)
+write_destructor_name (struct parser_state *par_state, struct stoken token)
 {
   char *copy = alloca (token.length + 1);
 
@@ -1645,7 +1670,7 @@ write_destructor_name (struct stoken token)
   token.ptr = copy;
   ++token.length;
 
-  write_exp_string (token);
+  write_exp_string (par_state, token);
 }
 
 /* Returns a stoken of the operator name given by OP (which does not
@@ -1706,7 +1731,8 @@ check_parameter_typelist (VEC (type_ptr) *params)
 /*** Needs some error checking for the float case ***/
 
 static int
-parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
+parse_number (struct parser_state *par_state,
+	      const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 {
   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
      here, and we do kind of silly things like cast to unsigned.  */
@@ -1742,9 +1768,10 @@ parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 	{
 	  p[len - 2] = '\0';
 	  putithere->typed_val_decfloat.type
-	    = parse_type->builtin_decfloat;
+	    = parse_type (par_state)->builtin_decfloat;
 	  decimal_from_string (putithere->typed_val_decfloat.val, 4,
-			       gdbarch_byte_order (parse_gdbarch), p);
+			       gdbarch_byte_order (parse_gdbarch (par_state)),
+			       p);
 	  p[len - 2] = 'd';
 	  return DECFLOAT;
 	}
@@ -1753,9 +1780,10 @@ parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 	{
 	  p[len - 2] = '\0';
 	  putithere->typed_val_decfloat.type
-	    = parse_type->builtin_decdouble;
+	    = parse_type (par_state)->builtin_decdouble;
 	  decimal_from_string (putithere->typed_val_decfloat.val, 8,
-			       gdbarch_byte_order (parse_gdbarch), p);
+			       gdbarch_byte_order (parse_gdbarch (par_state)),
+			       p);
 	  p[len - 2] = 'd';
 	  return DECFLOAT;
 	}
@@ -1764,14 +1792,15 @@ parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 	{
 	  p[len - 2] = '\0';
 	  putithere->typed_val_decfloat.type
-	    = parse_type->builtin_declong;
+	    = parse_type (par_state)->builtin_declong;
 	  decimal_from_string (putithere->typed_val_decfloat.val, 16,
-			       gdbarch_byte_order (parse_gdbarch), p);
+			       gdbarch_byte_order (parse_gdbarch (par_state)),
+			       p);
 	  p[len - 2] = 'd';
 	  return DECFLOAT;
 	}
 
-      if (! parse_c_float (parse_gdbarch, p, len,
+      if (! parse_c_float (parse_gdbarch (par_state), p, len,
 			   &putithere->typed_val_float.dval,
 			   &putithere->typed_val_float.type))
 	return ERROR;
@@ -1887,9 +1916,10 @@ parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 
   un = (ULONGEST)n >> 2;
   if (long_p == 0
-      && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
+      && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
+      high_bit
+	= ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
 
       /* A large decimal (not hex or octal) constant (between INT_MAX
 	 and UINT_MAX) is a long or unsigned long, according to ANSI,
@@ -1897,28 +1927,29 @@ parse_number (const char *buf, int len, int parsed_float, YYSTYPE *putithere)
 	 int.  This probably should be fixed.  GCC gives a warning on
 	 such constants.  */
 
-      unsigned_type = parse_type->builtin_unsigned_int;
-      signed_type = parse_type->builtin_int;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_int;
+      signed_type = parse_type (par_state)->builtin_int;
     }
   else if (long_p <= 1
-	   && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
+	   && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
-      unsigned_type = parse_type->builtin_unsigned_long;
-      signed_type = parse_type->builtin_long;
+      high_bit
+	= ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long;
+      signed_type = parse_type (par_state)->builtin_long;
     }
   else
     {
       int shift;
       if (sizeof (ULONGEST) * HOST_CHAR_BIT 
-	  < gdbarch_long_long_bit (parse_gdbarch))
+	  < gdbarch_long_long_bit (parse_gdbarch (par_state)))
 	/* A long long does not fit in a LONGEST.  */
 	shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
       else
-	shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
+	shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
       high_bit = (ULONGEST) 1 << shift;
-      unsigned_type = parse_type->builtin_unsigned_long_long;
-      signed_type = parse_type->builtin_long_long;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
+      signed_type = parse_type (par_state)->builtin_long_long;
     }
 
    putithere->typed_val_int.val = n;
@@ -2417,7 +2448,7 @@ static int last_was_structop;
 /* Read one token, getting characters through lexptr.  */
 
 static int
-lex_one_token (int *is_quoted_name)
+lex_one_token (struct parser_state *par_state, int *is_quoted_name)
 {
   int c;
   int namelen;
@@ -2450,7 +2481,7 @@ lex_one_token (int *is_quoted_name)
     if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
       {
 	if ((tokentab3[i].flags & FLAG_CXX) != 0
-	    && parse_language->la_language != language_cplus)
+	    && parse_language (par_state)->la_language != language_cplus)
 	  break;
 
 	lexptr += 3;
@@ -2463,7 +2494,7 @@ lex_one_token (int *is_quoted_name)
     if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
       {
 	if ((tokentab2[i].flags & FLAG_CXX) != 0
-	    && parse_language->la_language != language_cplus)
+	    && parse_language (par_state)->la_language != language_cplus)
 	  break;
 
 	lexptr += 2;
@@ -2507,7 +2538,8 @@ lex_one_token (int *is_quoted_name)
     case '(':
       paren_depth++;
       lexptr++;
-      if (parse_language->la_language == language_objc && c == '[')
+      if (parse_language (par_state)->la_language == language_objc
+	  && c == '[')
 	return OBJC_LBRAC;
       return c;
 
@@ -2587,7 +2619,8 @@ lex_one_token (int *is_quoted_name)
 				  && (*p < 'A' || *p > 'Z')))
 	      break;
 	  }
-	toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
+	toktype = parse_number (par_state, tokstart, p - tokstart,
+				got_dot|got_e, &yylval);
         if (toktype == ERROR)
 	  {
 	    char *err_copy = (char *) alloca (p - tokstart + 1);
@@ -2605,7 +2638,7 @@ lex_one_token (int *is_quoted_name)
 	const char *p = &tokstart[1];
 	size_t len = strlen ("entry");
 
-	if (parse_language->la_language == language_objc)
+	if (parse_language (par_state)->la_language == language_objc)
 	  {
 	    size_t len = strlen ("selector");
 
@@ -2759,7 +2792,7 @@ lex_one_token (int *is_quoted_name)
     if (strcmp (copy, ident_tokens[i].operator) == 0)
       {
 	if ((ident_tokens[i].flags & FLAG_CXX) != 0
-	    && parse_language->la_language != language_cplus)
+	    && parse_language (par_state)->la_language != language_cplus)
 	  break;
 
 	if ((ident_tokens[i].flags & FLAG_SHADOW) != 0)
@@ -2768,8 +2801,8 @@ lex_one_token (int *is_quoted_name)
 
 	    if (lookup_symbol (copy, expression_context_block,
 			       VAR_DOMAIN,
-			       (parse_language->la_language == language_cplus
-				? &is_a_field_of_this
+			       (parse_language (par_state)->la_language
+			        == language_cplus ? &is_a_field_of_this
 				: NULL))
 		!= NULL)
 	      {
@@ -2822,7 +2855,8 @@ static struct obstack name_obstack;
    IS_QUOTED_NAME is non-zero if the name token was originally quoted
    in single quotes.  */
 static int
-classify_name (const struct block *block, int is_quoted_name)
+classify_name (struct parser_state *par_state, const struct block *block,
+	       int is_quoted_name)
 {
   struct symbol *sym;
   char *copy;
@@ -2835,7 +2869,7 @@ classify_name (const struct block *block, int is_quoted_name)
   memset (&is_a_field_of_this, 0, sizeof (is_a_field_of_this));
 
   sym = lookup_symbol (copy, block, VAR_DOMAIN, 
-		       parse_language->la_name_of_this
+		       parse_language (par_state)->la_name_of_this
 		       ? &is_a_field_of_this : NULL);
 
   if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
@@ -2892,15 +2926,16 @@ classify_name (const struct block *block, int is_quoted_name)
     }
 
   yylval.tsym.type
-    = language_lookup_primitive_type_by_name (parse_language,
-					      parse_gdbarch, copy);
+    = language_lookup_primitive_type_by_name (parse_language (par_state),
+					      parse_gdbarch (par_state),
+					      copy);
   if (yylval.tsym.type != NULL)
     return TYPENAME;
 
   /* See if it's an ObjC classname.  */
-  if (parse_language->la_language == language_objc && !sym)
+  if (parse_language (par_state)->la_language == language_objc && !sym)
     {
-      CORE_ADDR Class = lookup_objc_class (parse_gdbarch, copy);
+      CORE_ADDR Class = lookup_objc_class (parse_gdbarch (par_state), copy);
       if (Class)
 	{
 	  yylval.class.class = Class;
@@ -2919,7 +2954,8 @@ classify_name (const struct block *block, int is_quoted_name)
 	  || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
     {
       YYSTYPE newlval;	/* Its value is ignored.  */
-      int hextype = parse_number (copy, yylval.sval.length, 0, &newlval);
+      int hextype = parse_number (par_state, copy, yylval.sval.length,
+				  0, &newlval);
       if (hextype == INT)
 	{
 	  yylval.ssym.sym = sym;
@@ -2933,7 +2969,7 @@ classify_name (const struct block *block, int is_quoted_name)
   yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
 
   if (sym == NULL
-      && parse_language->la_language == language_cplus
+      && parse_language (par_state)->la_language == language_cplus
       && is_a_field_of_this.type == NULL
       && lookup_minimal_symbol (copy, NULL, NULL).minsym == NULL)
     return UNKNOWN_CPP_NAME;
@@ -2946,13 +2982,14 @@ classify_name (const struct block *block, int is_quoted_name)
    NULL if this is the first component of a name.  */
 
 static int
-classify_inner_name (const struct block *block, struct type *context)
+classify_inner_name (struct parser_state *par_state,
+		     const struct block *block, struct type *context)
 {
   struct type *type;
   char *copy;
 
   if (context == NULL)
-    return classify_name (block, 0);
+    return classify_name (par_state, block, 0);
 
   type = check_typedef (context);
   if (TYPE_CODE (type) != TYPE_CODE_STRUCT
@@ -3035,10 +3072,11 @@ yylex (void)
   /* Read the first token and decide what to do.  Most of the
      subsequent code is C++-only; but also depends on seeing a "::" or
      name-like token.  */
-  current.token = lex_one_token (&is_quoted_name);
+  current.token = lex_one_token (pstate, &is_quoted_name);
   if (current.token == NAME)
-    current.token = classify_name (expression_context_block, is_quoted_name);
-  if (parse_language->la_language != language_cplus
+    current.token = classify_name (pstate, expression_context_block,
+				   is_quoted_name);
+  if (parse_language (pstate)->la_language != language_cplus
       || (current.token != TYPENAME && current.token != COLONCOLON
 	  && current.token != FILENAME))
     return current.token;
@@ -3054,7 +3092,7 @@ yylex (void)
 
       /* We ignore quoted names other than the very first one.
 	 Subsequent ones do not have any special meaning.  */
-      current.token = lex_one_token (&ignore);
+      current.token = lex_one_token (pstate, &ignore);
       current.value = yylval;
       VEC_safe_push (token_and_value, token_fifo, &current);
 
@@ -3104,7 +3142,8 @@ yylex (void)
 	  int classification;
 
 	  yylval = next->value;
-	  classification = classify_inner_name (search_block, context_type);
+	  classification = classify_inner_name (pstate, search_block,
+						context_type);
 	  /* We keep going until we either run out of names, or until
 	     we have a qualified name which is not a type.  */
 	  if (classification != TYPENAME && classification != NAME)
@@ -3164,11 +3203,17 @@ yylex (void)
 }
 
 int
-c_parse (void)
+c_parse (struct parser_state *par_state)
 {
   int result;
-  struct cleanup *back_to = make_cleanup (free_current_contents,
-					  &expression_macro_scope);
+  struct cleanup *back_to;
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  back_to = make_cleanup (free_current_contents, &expression_macro_scope);
+  make_cleanup_clear_parser_state (&pstate);
 
   /* Set up the scope for macro expansion.  */
   expression_macro_scope = NULL;
@@ -3200,6 +3245,7 @@ c_parse (void)
 
   result = yyparse ();
   do_cleanups (back_to);
+
   return result;
 }
 
diff --git a/gdb/c-lang.h b/gdb/c-lang.h
index 9c7dcfb..76bd426 100644
--- a/gdb/c-lang.h
+++ b/gdb/c-lang.h
@@ -24,6 +24,7 @@
 struct ui_file;
 struct language_arch_info;
 struct type_print_options;
+struct parser_state;
 
 #include "value.h"
 #include "macroexp.h"
@@ -57,7 +58,7 @@ enum c_string_type
 
 /* Defined in c-exp.y.  */
 
-extern int c_parse (void);
+extern int c_parse (struct parser_state *);
 
 extern void c_error (char *);
 
diff --git a/gdb/f-exp.y b/gdb/f-exp.y
index 7a94b15..3deaf30 100644
--- a/gdb/f-exp.y
+++ b/gdb/f-exp.y
@@ -54,8 +54,8 @@
 #include "block.h"
 #include <ctype.h>
 
-#define parse_type builtin_type (parse_gdbarch)
-#define parse_f_type builtin_f_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
+#define parse_f_type(ps) builtin_f_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -65,7 +65,7 @@
    generators need to be fixed instead of adding those names to this list.  */
 
 #define	yymaxdepth f_maxdepth
-#define	yyparse	f_parse
+#define	yyparse f_parse_internal
 #define	yylex	f_lex
 #define	yyerror	f_error
 #define	yylval	f_lval
@@ -117,6 +117,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -157,7 +162,8 @@ static int match_string_literal (void);
 
 %{
 /* YYSTYPE gets defined by %union */
-static int parse_number (const char *, int, int, YYSTYPE *);
+static int parse_number (struct parser_state *, const char *, int,
+			 int, YYSTYPE *);
 %}
 
 %type <voidval> exp  type_exp start variable 
@@ -239,9 +245,9 @@ start   :	exp
 	;
 
 type_exp:	type
-			{ write_exp_elt_opcode(OP_TYPE);
-			  write_exp_elt_type($1);
-			  write_exp_elt_opcode(OP_TYPE); }
+			{ write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_TYPE); }
 	;
 
 exp     :       '(' exp ')'
@@ -250,27 +256,27 @@ exp     :       '(' exp ')'
 
 /* Expressions, not including the comma operator.  */
 exp	:	'*' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_IND); }
+			{ write_exp_elt_opcode (pstate, UNOP_IND); }
 	;
 
 exp	:	'&' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_ADDR); }
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
 	;
 
 exp	:	'-' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_NEG); }
+			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 exp	:	BOOL_NOT exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 exp	:	'~' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_COMPLEMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
 	;
 
 exp	:	SIZEOF exp       %prec UNARY
-			{ write_exp_elt_opcode (UNOP_SIZEOF); }
+			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
 	;
 
 /* No more explicit array operators, we treat everything in F77 as 
@@ -281,9 +287,12 @@ exp	:	SIZEOF exp       %prec UNARY
 exp	:	exp '(' 
 			{ start_arglist (); }
 		arglist ')'	
-			{ write_exp_elt_opcode (OP_F77_UNDETERMINED_ARGLIST);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_F77_UNDETERMINED_ARGLIST); }
+			{ write_exp_elt_opcode (pstate,
+						OP_F77_UNDETERMINED_ARGLIST);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate,
+					      OP_F77_UNDETERMINED_ARGLIST); }
 	;
 
 arglist	:
@@ -304,27 +313,27 @@ arglist	:	arglist ',' exp   %prec ABOVE_COMMA
 /* There are four sorts of subrange types in F90.  */
 
 subrange:	exp ':' exp	%prec ABOVE_COMMA
-			{ write_exp_elt_opcode (OP_F90_RANGE); 
-			  write_exp_elt_longcst (NONE_BOUND_DEFAULT);
-			  write_exp_elt_opcode (OP_F90_RANGE); }
+			{ write_exp_elt_opcode (pstate, OP_F90_RANGE); 
+			  write_exp_elt_longcst (pstate, NONE_BOUND_DEFAULT);
+			  write_exp_elt_opcode (pstate, OP_F90_RANGE); }
 	;
 
 subrange:	exp ':'	%prec ABOVE_COMMA
-			{ write_exp_elt_opcode (OP_F90_RANGE);
-			  write_exp_elt_longcst (HIGH_BOUND_DEFAULT);
-			  write_exp_elt_opcode (OP_F90_RANGE); }
+			{ write_exp_elt_opcode (pstate, OP_F90_RANGE);
+			  write_exp_elt_longcst (pstate, HIGH_BOUND_DEFAULT);
+			  write_exp_elt_opcode (pstate, OP_F90_RANGE); }
 	;
 
 subrange:	':' exp	%prec ABOVE_COMMA
-			{ write_exp_elt_opcode (OP_F90_RANGE);
-			  write_exp_elt_longcst (LOW_BOUND_DEFAULT);
-			  write_exp_elt_opcode (OP_F90_RANGE); }
+			{ write_exp_elt_opcode (pstate, OP_F90_RANGE);
+			  write_exp_elt_longcst (pstate, LOW_BOUND_DEFAULT);
+			  write_exp_elt_opcode (pstate, OP_F90_RANGE); }
 	;
 
 subrange:	':'	%prec ABOVE_COMMA
-			{ write_exp_elt_opcode (OP_F90_RANGE);
-			  write_exp_elt_longcst (BOTH_BOUND_DEFAULT);
-			  write_exp_elt_opcode (OP_F90_RANGE); }
+			{ write_exp_elt_opcode (pstate, OP_F90_RANGE);
+			  write_exp_elt_longcst (pstate, BOTH_BOUND_DEFAULT);
+			  write_exp_elt_opcode (pstate, OP_F90_RANGE); }
 	;
 
 complexnum:     exp ',' exp 
@@ -332,133 +341,139 @@ complexnum:     exp ',' exp
         ;
 
 exp	:	'(' complexnum ')'
-                	{ write_exp_elt_opcode(OP_COMPLEX);
-			  write_exp_elt_type (parse_f_type->builtin_complex_s16);
-                	  write_exp_elt_opcode(OP_COMPLEX); }
+			{ write_exp_elt_opcode (pstate, OP_COMPLEX);
+			  write_exp_elt_type (pstate,
+					      parse_f_type (pstate)
+					      ->builtin_complex_s16);
+			  write_exp_elt_opcode (pstate, OP_COMPLEX); }
 	;
 
 exp	:	'(' type ')' exp  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_CAST);
-			  write_exp_elt_type ($2);
-			  write_exp_elt_opcode (UNOP_CAST); }
+			{ write_exp_elt_opcode (pstate, UNOP_CAST);
+			  write_exp_elt_type (pstate, $2);
+			  write_exp_elt_opcode (pstate, UNOP_CAST); }
 	;
 
 exp     :       exp '%' name
-                        { write_exp_elt_opcode (STRUCTOP_STRUCT);
-                          write_exp_string ($3);
-                          write_exp_elt_opcode (STRUCTOP_STRUCT); }
+                        { write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+                          write_exp_string (pstate, $3);
+                          write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
         ;
 
 /* Binary operators in order of decreasing precedence.  */
 
 exp	:	exp '@' exp
-			{ write_exp_elt_opcode (BINOP_REPEAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
 	;
 
 exp	:	exp STARSTAR exp
-			{ write_exp_elt_opcode (BINOP_EXP); }
+			{ write_exp_elt_opcode (pstate, BINOP_EXP); }
 	;
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 exp	:	exp '/' exp
-			{ write_exp_elt_opcode (BINOP_DIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 exp	:	exp LSH exp
-			{ write_exp_elt_opcode (BINOP_LSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
 	;
 
 exp	:	exp RSH exp
-			{ write_exp_elt_opcode (BINOP_RSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
 	;
 
 exp	:	exp EQUAL exp
-			{ write_exp_elt_opcode (BINOP_EQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (BINOP_LEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (BINOP_GEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 	;
 
 exp	:	exp LESSTHAN exp
-			{ write_exp_elt_opcode (BINOP_LESS); }
+			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 	;
 
 exp	:	exp GREATERTHAN exp
-			{ write_exp_elt_opcode (BINOP_GTR); }
+			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 	;
 
 exp	:	exp '&' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	;
 
 exp	:	exp '^' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 	;
 
 exp	:	exp '|' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	;
 
 exp     :       exp BOOL_AND exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 	;
 
 
 exp	:	exp BOOL_OR exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 	;
 
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 exp	:	exp ASSIGN_MODIFY exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode ($2);
-			  write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+			  write_exp_elt_opcode (pstate, $2);
+			  write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY); }
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_longcst ((LONGEST)($1.val));
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_longcst (pstate, (LONGEST) ($1.val));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	NAME_OR_INT
 			{ YYSTYPE val;
-			  parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (val.typed_val.type);
-			  write_exp_elt_longcst ((LONGEST)val.typed_val.val);
-			  write_exp_elt_opcode (OP_LONG); }
+			  parse_number (pstate, $1.stoken.ptr,
+					$1.stoken.length, 0, &val);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, val.typed_val.type);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST)val.typed_val.val);
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type (parse_f_type->builtin_real_s8);
-			  write_exp_elt_dblcst ($1);
-			  write_exp_elt_opcode (OP_DOUBLE); }
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate,
+					      parse_f_type (pstate)
+					      ->builtin_real_s8);
+			  write_exp_elt_dblcst (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 	;
 
 exp	:	variable
@@ -468,25 +483,28 @@ exp	:	VARIABLE
 	;
 
 exp	:	SIZEOF '(' type ')'	%prec UNARY
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_f_type->builtin_integer);
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					      parse_f_type (pstate)
+					      ->builtin_integer);
 			  CHECK_TYPEDEF ($3);
-			  write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
-			  write_exp_elt_opcode (OP_LONG); }
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) TYPE_LENGTH ($3));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp     :       BOOLEAN_LITERAL
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_BOOL);
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_BOOL);
 			}
         ;
 
 exp	:	STRING_LITERAL
 			{
-			  write_exp_elt_opcode (OP_STRING);
-			  write_exp_string ($1);
-			  write_exp_elt_opcode (OP_STRING);
+			  write_exp_elt_opcode (pstate, OP_STRING);
+			  write_exp_string (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_STRING);
 			}
 	;
 
@@ -502,13 +520,13 @@ variable:	name_not_typename
 						       innermost_block))
 				    innermost_block = block_found;
 				}
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to
 				 be in the same block.  */
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      break;
 			    }
 			  else
@@ -519,7 +537,7 @@ variable:	name_not_typename
 			      msymbol =
 				lookup_bound_minimal_symbol (arg);
 			      if (msymbol.minsym != NULL)
-				write_exp_msymbol (msymbol);
+				write_exp_msymbol (pstate, msymbol);
 			      else if (!have_full_symbols () && !have_partial_symbols ())
 				error (_("No symbol table is loaded.  Use the \"file\" command."));
 			      else
@@ -560,7 +578,8 @@ ptype	:	typebase
 			  {
 			    range_type =
 			      create_range_type ((struct type *) NULL,
-						 parse_f_type->builtin_integer,
+						 parse_f_type (pstate)
+						 ->builtin_integer,
 						 0, array_size - 1);
 			    follow_type =
 			      create_array_type ((struct type *) NULL,
@@ -606,31 +625,31 @@ typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 	:	TYPENAME
 			{ $$ = $1.type; }
 	|	INT_KEYWORD
-			{ $$ = parse_f_type->builtin_integer; }
+			{ $$ = parse_f_type (pstate)->builtin_integer; }
 	|	INT_S2_KEYWORD 
-			{ $$ = parse_f_type->builtin_integer_s2; }
+			{ $$ = parse_f_type (pstate)->builtin_integer_s2; }
 	|	CHARACTER 
-			{ $$ = parse_f_type->builtin_character; }
+			{ $$ = parse_f_type (pstate)->builtin_character; }
 	|	LOGICAL_S8_KEYWORD
-			{ $$ = parse_f_type->builtin_logical_s8; }
+			{ $$ = parse_f_type (pstate)->builtin_logical_s8; }
 	|	LOGICAL_KEYWORD 
-			{ $$ = parse_f_type->builtin_logical; }
+			{ $$ = parse_f_type (pstate)->builtin_logical; }
 	|	LOGICAL_S2_KEYWORD
-			{ $$ = parse_f_type->builtin_logical_s2; }
+			{ $$ = parse_f_type (pstate)->builtin_logical_s2; }
 	|	LOGICAL_S1_KEYWORD 
-			{ $$ = parse_f_type->builtin_logical_s1; }
+			{ $$ = parse_f_type (pstate)->builtin_logical_s1; }
 	|	REAL_KEYWORD 
-			{ $$ = parse_f_type->builtin_real; }
+			{ $$ = parse_f_type (pstate)->builtin_real; }
 	|       REAL_S8_KEYWORD
-			{ $$ = parse_f_type->builtin_real_s8; }
+			{ $$ = parse_f_type (pstate)->builtin_real_s8; }
 	|	REAL_S16_KEYWORD
-			{ $$ = parse_f_type->builtin_real_s16; }
+			{ $$ = parse_f_type (pstate)->builtin_real_s16; }
 	|	COMPLEX_S8_KEYWORD
-			{ $$ = parse_f_type->builtin_complex_s8; }
+			{ $$ = parse_f_type (pstate)->builtin_complex_s8; }
 	|	COMPLEX_S16_KEYWORD 
-			{ $$ = parse_f_type->builtin_complex_s16; }
+			{ $$ = parse_f_type (pstate)->builtin_complex_s16; }
 	|	COMPLEX_S32_KEYWORD 
-			{ $$ = parse_f_type->builtin_complex_s32; }
+			{ $$ = parse_f_type (pstate)->builtin_complex_s32; }
 	;
 
 nonempty_typelist
@@ -669,7 +688,8 @@ name_not_typename :	NAME
 /*** Needs some error checking for the float case ***/
 
 static int
-parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
+parse_number (struct parser_state *par_state,
+	      const char *p, int len, int parsed_float, YYSTYPE *putithere)
 {
   LONGEST n = 0;
   LONGEST prevn = 0;
@@ -775,20 +795,24 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
      are the same size.  So we shift it twice, with fewer bits
      each time, for the same result.  */
   
-  if ((gdbarch_int_bit (parse_gdbarch) != gdbarch_long_bit (parse_gdbarch)
+  if ((gdbarch_int_bit (parse_gdbarch (par_state))
+       != gdbarch_long_bit (parse_gdbarch (par_state))
        && ((n >> 2)
-	   >> (gdbarch_int_bit (parse_gdbarch)-2))) /* Avoid shift warning */
+	   >> (gdbarch_int_bit (parse_gdbarch (par_state))-2))) /* Avoid
+							    shift warning */
       || long_p)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch)-1);
-      unsigned_type = parse_type->builtin_unsigned_long;
-      signed_type = parse_type->builtin_long;
+      high_bit = ((ULONGEST)1)
+      << (gdbarch_long_bit (parse_gdbarch (par_state))-1);
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long;
+      signed_type = parse_type (par_state)->builtin_long;
     }
   else 
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch)-1);
-      unsigned_type = parse_type->builtin_unsigned_int;
-      signed_type = parse_type->builtin_int;
+      high_bit =
+	((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
+      unsigned_type = parse_type (par_state)->builtin_unsigned_int;
+      signed_type = parse_type (par_state)->builtin_int;
     }    
   
   putithere->typed_val.val = n;
@@ -1090,7 +1114,8 @@ yylex (void)
 			 && (*p < 'A' || *p > 'Z')))
 	      break;
 	  }
-	toktype = parse_number (tokstart, p - tokstart, got_dot|got_e|got_d,
+	toktype = parse_number (pstate, tokstart, p - tokstart,
+				got_dot|got_e|got_d,
 				&yylval);
         if (toktype == ERROR)
           {
@@ -1164,7 +1189,7 @@ yylex (void)
   
   if (*tokstart == '$')
     {
-      write_dollar_variable (yylval.sval);
+      write_dollar_variable (pstate, yylval.sval);
       return VARIABLE;
     }
   
@@ -1192,8 +1217,8 @@ yylex (void)
 
 	sym = lookup_symbol (tmp, expression_context_block,
 			     lookup_domains[i],
-			     parse_language->la_language == language_cplus
-			     ? &is_a_field_of_this : NULL);
+			     parse_language (pstate)->la_language
+			     == language_cplus ? &is_a_field_of_this : NULL);
 	if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
 	  {
 	    yylval.tsym.type = SYMBOL_TYPE (sym);
@@ -1205,8 +1230,8 @@ yylex (void)
       }
 
     yylval.tsym.type
-      = language_lookup_primitive_type_by_name (parse_language,
-						parse_gdbarch, tmp);
+      = language_lookup_primitive_type_by_name (parse_language (pstate),
+						parse_gdbarch (pstate), tmp);
     if (yylval.tsym.type != NULL)
       return TYPENAME;
     
@@ -1218,7 +1243,7 @@ yylex (void)
 	    || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
       {
  	YYSTYPE newlval;	/* Its value is ignored.  */
-	hextype = parse_number (tokstart, namelen, 0, &newlval);
+	hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
 	if (hextype == INT)
 	  {
 	    yylval.ssym.sym = sym;
@@ -1234,6 +1259,21 @@ yylex (void)
   }
 }
 
+int
+f_parse (struct parser_state *par_state)
+{
+  int result;
+  struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  result = yyparse ();
+  do_cleanups (c);
+  return result;
+}
+
 void
 yyerror (char *msg)
 {
diff --git a/gdb/f-lang.h b/gdb/f-lang.h
index 2d67a48..7f77603 100644
--- a/gdb/f-lang.h
+++ b/gdb/f-lang.h
@@ -21,8 +21,9 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 struct type_print_options;
+struct parser_state;
 
-extern int f_parse (void);
+extern int f_parse (struct parser_state *);
 
 extern void f_error (char *);	/* Defined in f-exp.y */
 
diff --git a/gdb/go-exp.y b/gdb/go-exp.y
index 974bdb1..bab5dde 100644
--- a/gdb/go-exp.y
+++ b/gdb/go-exp.y
@@ -66,7 +66,7 @@
 #include "charset.h"
 #include "block.h"
 
-#define parse_type builtin_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -122,6 +122,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -158,7 +163,8 @@ void yyerror (char *);
 
 %{
 /* YYSTYPE gets defined by %union.  */
-static int parse_number (const char *, int, int, YYSTYPE *);
+static int parse_number (struct parser_state *,
+			 const char *, int, int, YYSTYPE *);
 static int parse_go_float (struct gdbarch *gdbarch, const char *p, int len,
 			   DOUBLEST *d, struct type **t);
 %}
@@ -239,77 +245,77 @@ start   :	exp1
 	;
 
 type_exp:	type
-			{ write_exp_elt_opcode(OP_TYPE);
-			  write_exp_elt_type($1);
-			  write_exp_elt_opcode(OP_TYPE); }
+			{ write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_TYPE); }
 	;
 
 /* Expressions, including the comma operator.  */
 exp1	:	exp
 	|	exp1 ',' exp
-			{ write_exp_elt_opcode (BINOP_COMMA); }
+			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
 	;
 
 /* Expressions, not including the comma operator.  */
 exp	:	'*' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_IND); }
+			{ write_exp_elt_opcode (pstate, UNOP_IND); }
 	;
 
 exp	:	'&' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_ADDR); }
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
 	;
 
 exp	:	'-' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_NEG); }
+			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 exp	:	'+' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PLUS); }
+			{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
 	;
 
 exp	:	'!' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 exp	:	'^' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_COMPLEMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
 	;
 
 exp	:	exp INCREMENT    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_POSTINCREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
 	;
 
 exp	:	exp DECREMENT    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_POSTDECREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
 	;
 
 /* foo->bar is not in Go.  May want as a gdb extension.  Later.  */
 
 exp	:	exp '.' name_not_typename
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($3.stoken);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $3.stoken);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' name_not_typename COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($3.stoken);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $3.stoken);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '.' COMPLETE
 			{ struct stoken s;
-			  mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
+			  mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			  s.ptr = "";
 			  s.length = 0;
-			  write_exp_string (s);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			  write_exp_string (pstate, s);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '[' exp1 ']'
-			{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 	;
 
 exp	:	exp '('
@@ -317,9 +323,10 @@ exp	:	exp '('
 			   being accumulated by an outer function call.  */
 			{ start_arglist (); }
 		arglist ')'	%prec LEFT_ARROW
-			{ write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_FUNCALL); }
+			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate, OP_FUNCALL); }
 	;
 
 lcurly	:	'{'
@@ -342,15 +349,15 @@ rcurly	:	'}'
 	;
 
 exp	:	lcurly type rcurly exp  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_MEMVAL);
-			  write_exp_elt_type ($2);
-			  write_exp_elt_opcode (UNOP_MEMVAL); }
+			{ write_exp_elt_opcode (pstate, UNOP_MEMVAL);
+			  write_exp_elt_type (pstate, $2);
+			  write_exp_elt_opcode (pstate, UNOP_MEMVAL); }
 	;
 
 exp	:	type '(' exp ')'  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_CAST);
-			  write_exp_elt_type ($1);
-			  write_exp_elt_opcode (UNOP_CAST); }
+			{ write_exp_elt_opcode (pstate, UNOP_CAST);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, UNOP_CAST); }
 	;
 
 exp	:	'(' exp1 ')'
@@ -360,100 +367,100 @@ exp	:	'(' exp1 ')'
 /* Binary operators in order of decreasing precedence.  */
 
 exp	:	exp '@' exp
-			{ write_exp_elt_opcode (BINOP_REPEAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
 	;
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 exp	:	exp '/' exp
-			{ write_exp_elt_opcode (BINOP_DIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 	;
 
 exp	:	exp '%' exp
-			{ write_exp_elt_opcode (BINOP_REM); }
+			{ write_exp_elt_opcode (pstate, BINOP_REM); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 exp	:	exp LSH exp
-			{ write_exp_elt_opcode (BINOP_LSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
 	;
 
 exp	:	exp RSH exp
-			{ write_exp_elt_opcode (BINOP_RSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
 	;
 
 exp	:	exp EQUAL exp
-			{ write_exp_elt_opcode (BINOP_EQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (BINOP_LEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (BINOP_GEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 	;
 
 exp	:	exp '<' exp
-			{ write_exp_elt_opcode (BINOP_LESS); }
+			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 	;
 
 exp	:	exp '>' exp
-			{ write_exp_elt_opcode (BINOP_GTR); }
+			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 	;
 
 exp	:	exp '&' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	;
 
 exp	:	exp '^' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 	;
 
 exp	:	exp '|' exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	;
 
 exp	:	exp ANDAND exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 	;
 
 exp	:	exp OROR exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 	;
 
 exp	:	exp '?' exp ':' exp	%prec '?'
-			{ write_exp_elt_opcode (TERNOP_COND); }
+			{ write_exp_elt_opcode (pstate, TERNOP_COND); }
 	;
 
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 exp	:	exp ASSIGN_MODIFY exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode ($2);
-			  write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+			  write_exp_elt_opcode (pstate, $2);
+			  write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY); }
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_longcst ((LONGEST)($1.val));
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_longcst (pstate, (LONGEST)($1.val));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	CHAR
@@ -461,28 +468,28 @@ exp	:	CHAR
 			  struct stoken_vector vec;
 			  vec.len = 1;
 			  vec.tokens = &$1;
-			  write_exp_string_vector ($1.type, &vec);
+			  write_exp_string_vector (pstate, $1.type, &vec);
 			}
 	;
 
 exp	:	NAME_OR_INT
 			{ YYSTYPE val;
-			  parse_number ($1.stoken.ptr, $1.stoken.length,
-					0, &val);
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (val.typed_val_int.type);
-			  write_exp_elt_longcst ((LONGEST)
+			  parse_number (pstate, $1.stoken.ptr,
+					$1.stoken.length, 0, &val);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, val.typed_val_int.type);
+			  write_exp_elt_longcst (pstate, (LONGEST)
 						 val.typed_val_int.val);
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			}
 	;
 
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type ($1.type);
-			  write_exp_elt_dblcst ($1.dval);
-			  write_exp_elt_opcode (OP_DOUBLE); }
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate, $1.type);
+			  write_exp_elt_dblcst (pstate, $1.dval);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 	;
 
 exp	:	variable
@@ -490,26 +497,29 @@ exp	:	variable
 
 exp	:	DOLLAR_VARIABLE
 			{
-			  write_dollar_variable ($1);
+			  write_dollar_variable (pstate, $1);
 			}
 	;
 
 exp	:	SIZEOF_KEYWORD '(' type ')'  %prec UNARY
 			{
 			  /* TODO(dje): Go objects in structs.  */
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			  /* TODO(dje): What's the right type here?  */
-			  write_exp_elt_type (parse_type->builtin_unsigned_int);
+			  write_exp_elt_type
+			    (pstate,
+			     parse_type (pstate)->builtin_unsigned_int);
 			  CHECK_TYPEDEF ($3);
-			  write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) TYPE_LENGTH ($3));
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			}
 	;
 
 exp	:	SIZEOF_KEYWORD  '(' exp ')'  %prec UNARY
 			{
 			  /* TODO(dje): Go objects in structs.  */
-			  write_exp_elt_opcode (UNOP_SIZEOF);
+			  write_exp_elt_opcode (pstate, UNOP_SIZEOF);
 			}
 
 string_exp:
@@ -552,7 +562,8 @@ exp	:	string_exp  %prec ABOVE_COMMA
 			{
 			  int i;
 
-			  write_exp_string_vector (0 /*always utf8*/, &$1);
+			  write_exp_string_vector (pstate, 0 /*always utf8*/,
+						   &$1);
 			  for (i = 0; i < $1.len; ++i)
 			    free ($1.tokens[i].ptr);
 			  free ($1.tokens);
@@ -560,15 +571,15 @@ exp	:	string_exp  %prec ABOVE_COMMA
 	;
 
 exp	:	TRUE_KEYWORD
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 exp	:	FALSE_KEYWORD
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 variable:	name_not_typename ENTRY
@@ -581,9 +592,9 @@ variable:	name_not_typename ENTRY
 				     "parameters, not for \"%s\""),
 				   copy_name ($1.stoken));
 
-			  write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
-			  write_exp_elt_sym (sym);
-			  write_exp_elt_opcode (OP_VAR_ENTRY_VALUE);
+			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
+			  write_exp_elt_sym (pstate, sym);
+			  write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
 			}
 	;
 
@@ -600,13 +611,13 @@ variable:	name_not_typename
 				    innermost_block = block_found;
 				}
 
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to
 				 be in the same block.  */
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			    }
 			  else if ($1.is_a_field_of_this)
 			    {
@@ -622,7 +633,7 @@ variable:	name_not_typename
 			      msymbol =
 				lookup_bound_minimal_symbol (arg);
 			      if (msymbol.minsym != NULL)
-				write_exp_msymbol (msymbol);
+				write_exp_msymbol (pstate, msymbol);
 			      else if (!have_full_symbols ()
 				       && !have_partial_symbols ())
 				error (_("No symbol table is loaded.  "
@@ -652,7 +663,7 @@ type  /* Implements (approximately): [*] type-specifier */
 					      expression_context_block); }
 */
 	|	BYTE_KEYWORD
-			{ $$ = builtin_go_type (parse_gdbarch)
+			{ $$ = builtin_go_type (parse_gdbarch (pstate))
 			    ->builtin_uint8; }
 	;
 
@@ -704,7 +715,8 @@ parse_go_float (struct gdbarch *gdbarch, const char *p, int len,
    as our YYSTYPE is different than c-exp.y's  */
 
 static int
-parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
+parse_number (struct parser_state *par_state,
+	      const char *p, int len, int parsed_float, YYSTYPE *putithere)
 {
   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
      here, and we do kind of silly things like cast to unsigned.  */
@@ -729,7 +741,7 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 
   if (parsed_float)
     {
-      if (! parse_go_float (parse_gdbarch, p, len,
+      if (! parse_go_float (parse_gdbarch (par_state), p, len,
 			    &putithere->typed_val_float.dval,
 			    &putithere->typed_val_float.type))
 	return ERROR;
@@ -845,9 +857,10 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 
   un = (ULONGEST)n >> 2;
   if (long_p == 0
-      && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
+      && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
+      high_bit
+        = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
 
       /* A large decimal (not hex or octal) constant (between INT_MAX
 	 and UINT_MAX) is a long or unsigned long, according to ANSI,
@@ -855,28 +868,29 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 	 int.  This probably should be fixed.  GCC gives a warning on
 	 such constants.  */
 
-      unsigned_type = parse_type->builtin_unsigned_int;
-      signed_type = parse_type->builtin_int;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_int;
+      signed_type = parse_type (par_state)->builtin_int;
     }
   else if (long_p <= 1
-	   && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
+	   && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
-      unsigned_type = parse_type->builtin_unsigned_long;
-      signed_type = parse_type->builtin_long;
+      high_bit
+	= ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long;
+      signed_type = parse_type (par_state)->builtin_long;
     }
   else
     {
       int shift;
       if (sizeof (ULONGEST) * HOST_CHAR_BIT
-	  < gdbarch_long_long_bit (parse_gdbarch))
+	  < gdbarch_long_long_bit (parse_gdbarch (par_state)))
 	/* A long long does not fit in a LONGEST.  */
 	shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
       else
-	shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
+	shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
       high_bit = (ULONGEST) 1 << shift;
-      unsigned_type = parse_type->builtin_unsigned_long_long;
-      signed_type = parse_type->builtin_long_long;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
+      signed_type = parse_type (par_state)->builtin_long_long;
     }
 
    putithere->typed_val_int.val = n;
@@ -1044,7 +1058,7 @@ static int last_was_structop;
 /* Read one token, getting characters through lexptr.  */
 
 static int
-lex_one_token (void)
+lex_one_token (struct parser_state *par_state)
 {
   int c;
   int namelen;
@@ -1175,7 +1189,8 @@ lex_one_token (void)
 				  && (*p < 'A' || *p > 'Z')))
 	      break;
 	  }
-	toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
+	toktype = parse_number (par_state, tokstart, p - tokstart,
+				got_dot|got_e, &yylval);
         if (toktype == ERROR)
 	  {
 	    char *err_copy = (char *) alloca (p - tokstart + 1);
@@ -1431,7 +1446,7 @@ classify_packaged_name (const struct block *block)
    The result is one of NAME, NAME_OR_INT, or TYPENAME.  */
 
 static int
-classify_name (const struct block *block)
+classify_name (struct parser_state *par_state, const struct block *block)
 {
   struct type *type;
   struct symbol *sym;
@@ -1441,8 +1456,9 @@ classify_name (const struct block *block)
   copy = copy_name (yylval.sval);
 
   /* Try primitive types first so they win over bad/weird debug info.  */
-  type = language_lookup_primitive_type_by_name (parse_language,
-						 parse_gdbarch, copy);
+  type = language_lookup_primitive_type_by_name (parse_language (par_state),
+						 parse_gdbarch (par_state),
+						 copy);
   if (type != NULL)
     {
       /* NOTE: We take advantage of the fact that yylval coming in was a
@@ -1498,7 +1514,8 @@ classify_name (const struct block *block)
       || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10))
     {
       YYSTYPE newlval;	/* Its value is ignored.  */
-      int hextype = parse_number (copy, yylval.sval.length, 0, &newlval);
+      int hextype = parse_number (par_state, copy, yylval.sval.length,
+				  0, &newlval);
       if (hextype == INT)
 	{
 	  yylval.ssym.sym = NULL;
@@ -1531,7 +1548,7 @@ yylex (void)
     }
   popping = 0;
 
-  current.token = lex_one_token ();
+  current.token = lex_one_token (pstate);
 
   /* TODO: Need a way to force specifying name1 as a package.
      .name1.name2 ?  */
@@ -1542,14 +1559,14 @@ yylex (void)
   /* See if we have "name1 . name2".  */
 
   current.value = yylval;
-  next.token = lex_one_token ();
+  next.token = lex_one_token (pstate);
   next.value = yylval;
 
   if (next.token == '.')
     {
       token_and_value name2;
 
-      name2.token = lex_one_token ();
+      name2.token = lex_one_token (pstate);
       name2.value = yylval;
 
       if (name2.token == NAME)
@@ -1588,16 +1605,23 @@ yylex (void)
 
   popping = 1;
   yylval = current.value;
-  return classify_name (expression_context_block);
+  return classify_name (pstate, expression_context_block);
 }
 
 int
-go_parse (void)
+go_parse (struct parser_state *par_state)
 {
   int result;
-  struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
+  struct cleanup *back_to;
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  back_to = make_cleanup (null_cleanup, NULL);
 
   make_cleanup_restore_integer (&yydebug);
+  make_cleanup_clear_parser_state (&pstate);
   yydebug = parser_debug;
 
   /* Initialize some state used by the lexer.  */
diff --git a/gdb/go-lang.h b/gdb/go-lang.h
index 726b7ad..1fe12fa 100644
--- a/gdb/go-lang.h
+++ b/gdb/go-lang.h
@@ -26,6 +26,8 @@ struct type_print_options;
 #include "symtab.h"
 #include "value.h"
 
+struct parser_state;
+
 struct builtin_go_type
 {
   struct type *builtin_void;
@@ -56,7 +58,7 @@ enum go_type
 
 /* Defined in go-exp.y.  */
 
-extern int go_parse (void);
+extern int go_parse (struct parser_state *);
 
 extern void go_error (char *);
 
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index be40b20..5515afb 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -3766,33 +3766,36 @@ i386_stap_parse_special_token_triplet (struct gdbarch *gdbarch,
 
       for (i = 0; i < 3; i++)
 	{
-	  write_exp_elt_opcode (OP_LONG);
-	  write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-	  write_exp_elt_longcst (displacements[i]);
-	  write_exp_elt_opcode (OP_LONG);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
+	  write_exp_elt_type
+	    (&p->pstate, builtin_type (gdbarch)->builtin_long);
+	  write_exp_elt_longcst (&p->pstate, displacements[i]);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
 	  if (got_minus[i])
-	    write_exp_elt_opcode (UNOP_NEG);
+	    write_exp_elt_opcode (&p->pstate, UNOP_NEG);
 	}
 
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       str.ptr = regname;
       str.length = len;
-      write_exp_string (str);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, str);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (builtin_type (gdbarch)->builtin_data_ptr);
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate,
+			  builtin_type (gdbarch)->builtin_data_ptr);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (BINOP_ADD);
-      write_exp_elt_opcode (BINOP_ADD);
-      write_exp_elt_opcode (BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (lookup_pointer_type (p->arg_type));
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate,
+			  lookup_pointer_type (p->arg_type));
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (UNOP_IND);
+      write_exp_elt_opcode (&p->pstate, UNOP_IND);
 
       p->arg = s;
 
@@ -3912,47 +3915,50 @@ i386_stap_parse_special_token_three_arg_disp (struct gdbarch *gdbarch,
 
       if (offset)
 	{
-	  write_exp_elt_opcode (OP_LONG);
-	  write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-	  write_exp_elt_longcst (offset);
-	  write_exp_elt_opcode (OP_LONG);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
+	  write_exp_elt_type (&p->pstate,
+			      builtin_type (gdbarch)->builtin_long);
+	  write_exp_elt_longcst (&p->pstate, offset);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
 	  if (offset_minus)
-	    write_exp_elt_opcode (UNOP_NEG);
+	    write_exp_elt_opcode (&p->pstate, UNOP_NEG);
 	}
 
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       base_token.ptr = base;
       base_token.length = len_base;
-      write_exp_string (base_token);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, base_token);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
       if (offset)
-	write_exp_elt_opcode (BINOP_ADD);
+	write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       index_token.ptr = index;
       index_token.length = len_index;
-      write_exp_string (index_token);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, index_token);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
       if (size)
 	{
-	  write_exp_elt_opcode (OP_LONG);
-	  write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-	  write_exp_elt_longcst (size);
-	  write_exp_elt_opcode (OP_LONG);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
+	  write_exp_elt_type (&p->pstate,
+			      builtin_type (gdbarch)->builtin_long);
+	  write_exp_elt_longcst (&p->pstate, size);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
 	  if (size_minus)
-	    write_exp_elt_opcode (UNOP_NEG);
-	  write_exp_elt_opcode (BINOP_MUL);
+	    write_exp_elt_opcode (&p->pstate, UNOP_NEG);
+	  write_exp_elt_opcode (&p->pstate, BINOP_MUL);
 	}
 
-      write_exp_elt_opcode (BINOP_ADD);
+      write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (lookup_pointer_type (p->arg_type));
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate,
+			  lookup_pointer_type (p->arg_type));
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (UNOP_IND);
+      write_exp_elt_opcode (&p->pstate, UNOP_IND);
 
       p->arg = s;
 
diff --git a/gdb/jv-exp.y b/gdb/jv-exp.y
index ec23b34..0894fad 100644
--- a/gdb/jv-exp.y
+++ b/gdb/jv-exp.y
@@ -49,8 +49,8 @@
 #include "block.h"
 #include "completer.h"
 
-#define parse_type builtin_type (parse_gdbarch)
-#define parse_java_type builtin_java_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
+#define parse_java_type(ps) builtin_java_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -60,7 +60,7 @@
    generators need to be fixed instead of adding those names to this list.  */
 
 #define	yymaxdepth java_maxdepth
-#define	yyparse	java_parse
+#define	yyparse	java_parse_internal
 #define	yylex	java_lex
 #define	yyerror	java_error
 #define	yylval	java_lval
@@ -112,6 +112,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -119,11 +124,11 @@ static int yylex (void);
 void yyerror (char *);
 
 static struct type *java_type_from_name (struct stoken);
-static void push_expression_name (struct stoken);
-static void push_fieldnames (struct stoken);
+static void push_expression_name (struct parser_state *, struct stoken);
+static void push_fieldnames (struct parser_state *, struct stoken);
 
 static struct expression *copy_exp (struct expression *, int);
-static void insert_exp (int, struct expression *);
+static void insert_exp (struct parser_state *, int, struct expression *);
 
 %}
 
@@ -155,7 +160,8 @@ static void insert_exp (int, struct expression *);
 
 %{
 /* YYSTYPE gets defined by %union */
-static int parse_number (const char *, int, int, YYSTYPE *);
+static int parse_number (struct parser_state *, const char *, int,
+			 int, YYSTYPE *);
 %}
 
 %type <lval> rcurly Dims Dims_opt
@@ -215,9 +221,9 @@ start   :	exp1
 
 type_exp:	PrimitiveOrArrayType
 		{
-		  write_exp_elt_opcode(OP_TYPE);
-		  write_exp_elt_type($1);
-		  write_exp_elt_opcode(OP_TYPE);
+		  write_exp_elt_opcode (pstate, OP_TYPE);
+		  write_exp_elt_type (pstate, $1);
+		  write_exp_elt_opcode (pstate, OP_TYPE);
 		}
 	;
 
@@ -229,36 +235,38 @@ PrimitiveOrArrayType:
 StringLiteral:
 	STRING_LITERAL
 		{
-		  write_exp_elt_opcode (OP_STRING);
-		  write_exp_string ($1);
-		  write_exp_elt_opcode (OP_STRING);
+		  write_exp_elt_opcode (pstate, OP_STRING);
+		  write_exp_string (pstate, $1);
+		  write_exp_elt_opcode (pstate, OP_STRING);
 		}
 ;
 
 Literal:
 	INTEGER_LITERAL
-		{ write_exp_elt_opcode (OP_LONG);
-		  write_exp_elt_type ($1.type);
-		  write_exp_elt_longcst ((LONGEST)($1.val));
-		  write_exp_elt_opcode (OP_LONG); }
+		{ write_exp_elt_opcode (pstate, OP_LONG);
+		  write_exp_elt_type (pstate, $1.type);
+		  write_exp_elt_longcst (pstate, (LONGEST)($1.val));
+		  write_exp_elt_opcode (pstate, OP_LONG); }
 |	NAME_OR_INT
 		{ YYSTYPE val;
-		  parse_number ($1.ptr, $1.length, 0, &val);
-		  write_exp_elt_opcode (OP_LONG);
-		  write_exp_elt_type (val.typed_val_int.type);
-		  write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
-		  write_exp_elt_opcode (OP_LONG);
+		  parse_number (pstate, $1.ptr, $1.length, 0, &val);
+		  write_exp_elt_opcode (pstate, OP_LONG);
+		  write_exp_elt_type (pstate, val.typed_val_int.type);
+		  write_exp_elt_longcst (pstate,
+					 (LONGEST) val.typed_val_int.val);
+		  write_exp_elt_opcode (pstate, OP_LONG);
 		}
 |	FLOATING_POINT_LITERAL
-		{ write_exp_elt_opcode (OP_DOUBLE);
-		  write_exp_elt_type ($1.type);
-		  write_exp_elt_dblcst ($1.dval);
-		  write_exp_elt_opcode (OP_DOUBLE); }
+		{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+		  write_exp_elt_type (pstate, $1.type);
+		  write_exp_elt_dblcst (pstate, $1.dval);
+		  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 |	BOOLEAN_LITERAL
-		{ write_exp_elt_opcode (OP_LONG);
-		  write_exp_elt_type (parse_java_type->builtin_boolean);
-		  write_exp_elt_longcst ((LONGEST)$1);
-		  write_exp_elt_opcode (OP_LONG); }
+		{ write_exp_elt_opcode (pstate, OP_LONG);
+		  write_exp_elt_type (pstate,
+				  parse_java_type (pstate)->builtin_boolean);
+		  write_exp_elt_longcst (pstate, (LONGEST)$1);
+		  write_exp_elt_opcode (pstate, OP_LONG); }
 |	StringLiteral
 	;
 
@@ -272,7 +280,7 @@ Type:
 PrimitiveType:
 	NumericType
 |	BOOLEAN
-		{ $$ = parse_java_type->builtin_boolean; }
+		{ $$ = parse_java_type (pstate)->builtin_boolean; }
 ;
 
 NumericType:
@@ -282,22 +290,22 @@ NumericType:
 
 IntegralType:
 	BYTE
-		{ $$ = parse_java_type->builtin_byte; }
+		{ $$ = parse_java_type (pstate)->builtin_byte; }
 |	SHORT
-		{ $$ = parse_java_type->builtin_short; }
+		{ $$ = parse_java_type (pstate)->builtin_short; }
 |	INT
-		{ $$ = parse_java_type->builtin_int; }
+		{ $$ = parse_java_type (pstate)->builtin_int; }
 |	LONG
-		{ $$ = parse_java_type->builtin_long; }
+		{ $$ = parse_java_type (pstate)->builtin_long; }
 |	CHAR
-		{ $$ = parse_java_type->builtin_char; }
+		{ $$ = parse_java_type (pstate)->builtin_char; }
 ;
 
 FloatingPointType:
 	FLOAT
-		{ $$ = parse_java_type->builtin_float; }
+		{ $$ = parse_java_type (pstate)->builtin_float; }
 |	DOUBLE
-		{ $$ = parse_java_type->builtin_double; }
+		{ $$ = parse_java_type (pstate)->builtin_double; }
 ;
 
 /* UNUSED:
@@ -367,7 +375,7 @@ type_exp:	type
 /* Expressions, including the comma operator.  */
 exp1	:	Expression
 	|	exp1 ',' Expression
-			{ write_exp_elt_opcode (BINOP_COMMA); }
+			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
 	;
 
 Primary:
@@ -383,10 +391,10 @@ PrimaryNoNewArray:
 |	MethodInvocation
 |	ArrayAccess
 |	lcurly ArgumentList rcurly
-		{ write_exp_elt_opcode (OP_ARRAY);
-		  write_exp_elt_longcst ((LONGEST) 0);
-		  write_exp_elt_longcst ((LONGEST) $3);
-		  write_exp_elt_opcode (OP_ARRAY); }
+		{ write_exp_elt_opcode (pstate, OP_ARRAY);
+		  write_exp_elt_longcst (pstate, (LONGEST) 0);
+		  write_exp_elt_longcst (pstate, (LONGEST) $3);
+		  write_exp_elt_opcode (pstate, OP_ARRAY); }
 ;
 
 lcurly:
@@ -451,24 +459,24 @@ Dims_opt:
 
 FieldAccess:
 	Primary '.' SimpleName
-		{ push_fieldnames ($3); }
+		{ push_fieldnames (pstate, $3); }
 |	VARIABLE '.' SimpleName
-		{ push_fieldnames ($3); }
+		{ push_fieldnames (pstate, $3); }
 /*|	SUPER '.' SimpleName { FIXME } */
 ;
 
 FuncStart:
 	Name '('
-                { push_expression_name ($1); }
+                { push_expression_name (pstate, $1); }
 ;
 
 MethodInvocation:
 	FuncStart
                 { start_arglist(); }
 	ArgumentList_opt ')'
-                { write_exp_elt_opcode (OP_FUNCALL);
-		  write_exp_elt_longcst ((LONGEST) end_arglist ());
-		  write_exp_elt_opcode (OP_FUNCALL); }
+                { write_exp_elt_opcode (pstate, OP_FUNCALL);
+		  write_exp_elt_longcst (pstate, (LONGEST) end_arglist ());
+		  write_exp_elt_opcode (pstate, OP_FUNCALL); }
 |	Primary '.' SimpleName '(' ArgumentList_opt ')'
 		{ error (_("Form of method invocation not implemented")); }
 |	SUPER '.' SimpleName '(' ArgumentList_opt ')'
@@ -485,24 +493,27 @@ ArrayAccess:
 		     for our parsing kludges.  */
 		  struct expression *name_expr;
 
-		  push_expression_name ($1);
-		  name_expr = copy_exp (expout, expout_ptr);
-		  expout_ptr -= name_expr->nelts;
-		  insert_exp (expout_ptr-length_of_subexp (expout, expout_ptr),
+		  push_expression_name (pstate, $1);
+		  name_expr = copy_exp (pstate->expout, pstate->expout_ptr);
+		  pstate->expout_ptr -= name_expr->nelts;
+		  insert_exp (pstate,
+			      pstate->expout_ptr
+			      - length_of_subexp (pstate->expout,
+						  pstate->expout_ptr),
 			      name_expr);
 		  free (name_expr);
-		  write_exp_elt_opcode (BINOP_SUBSCRIPT);
+		  write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT);
 		}
 |	VARIABLE '[' Expression ']'
-		{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+		{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 |	PrimaryNoNewArray '[' Expression ']'
-		{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+		{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 ;
 
 PostfixExpression:
 	Primary
 |	Name
-		{ push_expression_name ($1); }
+		{ push_expression_name (pstate, $1); }
 |	VARIABLE
 		/* Already written by write_dollar_variable.  */
 |	PostIncrementExpression
@@ -511,12 +522,12 @@ PostfixExpression:
 
 PostIncrementExpression:
 	PostfixExpression INCREMENT
-		{ write_exp_elt_opcode (UNOP_POSTINCREMENT); }
+		{ write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
 ;
 
 PostDecrementExpression:
 	PostfixExpression DECREMENT
-		{ write_exp_elt_opcode (UNOP_POSTDECREMENT); }
+		{ write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
 ;
 
 UnaryExpression:
@@ -524,144 +535,151 @@ UnaryExpression:
 |	PreDecrementExpression
 |	'+' UnaryExpression
 |	'-' UnaryExpression
-		{ write_exp_elt_opcode (UNOP_NEG); }
+		{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 |	'*' UnaryExpression 
-		{ write_exp_elt_opcode (UNOP_IND); } /*FIXME not in Java  */
+		{ write_exp_elt_opcode (pstate,
+					UNOP_IND); } /*FIXME not in Java  */
 |	UnaryExpressionNotPlusMinus
 ;
 
 PreIncrementExpression:
 	INCREMENT UnaryExpression
-		{ write_exp_elt_opcode (UNOP_PREINCREMENT); }
+		{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
 ;
 
 PreDecrementExpression:
 	DECREMENT UnaryExpression
-		{ write_exp_elt_opcode (UNOP_PREDECREMENT); }
+		{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
 ;
 
 UnaryExpressionNotPlusMinus:
 	PostfixExpression
 |	'~' UnaryExpression
-		{ write_exp_elt_opcode (UNOP_COMPLEMENT); }
+		{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
 |	'!' UnaryExpression
-		{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+		{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 |	CastExpression
 	;
 
 CastExpression:
 	'(' PrimitiveType Dims_opt ')' UnaryExpression
-		{ write_exp_elt_opcode (UNOP_CAST);
-		  write_exp_elt_type (java_array_type ($2, $3));
-		  write_exp_elt_opcode (UNOP_CAST); }
+		{ write_exp_elt_opcode (pstate, UNOP_CAST);
+		  write_exp_elt_type (pstate, java_array_type ($2, $3));
+		  write_exp_elt_opcode (pstate, UNOP_CAST); }
 |	'(' Expression ')' UnaryExpressionNotPlusMinus
 		{
-		  int last_exp_size = length_of_subexp(expout, expout_ptr);
+		  int last_exp_size = length_of_subexp (pstate->expout,
+							pstate->expout_ptr);
 		  struct type *type;
 		  int i;
-		  int base = expout_ptr - last_exp_size - 3;
-		  if (base < 0 || expout->elts[base+2].opcode != OP_TYPE)
+		  int base = pstate->expout_ptr - last_exp_size - 3;
+
+		  if (base < 0
+		      || pstate->expout->elts[base+2].opcode != OP_TYPE)
 		    error (_("Invalid cast expression"));
-		  type = expout->elts[base+1].type;
+		  type = pstate->expout->elts[base+1].type;
 		  /* Remove the 'Expression' and slide the
 		     UnaryExpressionNotPlusMinus down to replace it.  */
 		  for (i = 0;  i < last_exp_size;  i++)
-		    expout->elts[base + i] = expout->elts[base + i + 3];
-		  expout_ptr -= 3;
+		    pstate->expout->elts[base + i]
+		      = pstate->expout->elts[base + i + 3];
+		  pstate->expout_ptr -= 3;
 		  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
 		    type = lookup_pointer_type (type);
-		  write_exp_elt_opcode (UNOP_CAST);
-		  write_exp_elt_type (type);
-		  write_exp_elt_opcode (UNOP_CAST);
+		  write_exp_elt_opcode (pstate, UNOP_CAST);
+		  write_exp_elt_type (pstate, type);
+		  write_exp_elt_opcode (pstate, UNOP_CAST);
 		}
 |	'(' Name Dims ')' UnaryExpressionNotPlusMinus
-		{ write_exp_elt_opcode (UNOP_CAST);
-		  write_exp_elt_type (java_array_type (java_type_from_name ($2), $3));
-		  write_exp_elt_opcode (UNOP_CAST); }
+		{ write_exp_elt_opcode (pstate, UNOP_CAST);
+		  write_exp_elt_type (pstate,
+				      java_array_type (java_type_from_name
+						       ($2), $3));
+		  write_exp_elt_opcode (pstate, UNOP_CAST); }
 ;
 
 
 MultiplicativeExpression:
 	UnaryExpression
 |	MultiplicativeExpression '*' UnaryExpression
-		{ write_exp_elt_opcode (BINOP_MUL); }
+		{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 |	MultiplicativeExpression '/' UnaryExpression
-		{ write_exp_elt_opcode (BINOP_DIV); }
+		{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 |	MultiplicativeExpression '%' UnaryExpression
-		{ write_exp_elt_opcode (BINOP_REM); }
+		{ write_exp_elt_opcode (pstate, BINOP_REM); }
 ;
 
 AdditiveExpression:
 	MultiplicativeExpression
 |	AdditiveExpression '+' MultiplicativeExpression
-		{ write_exp_elt_opcode (BINOP_ADD); }
+		{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 |	AdditiveExpression '-' MultiplicativeExpression
-		{ write_exp_elt_opcode (BINOP_SUB); }
+		{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 ;
 
 ShiftExpression:
 	AdditiveExpression
 |	ShiftExpression LSH AdditiveExpression
-		{ write_exp_elt_opcode (BINOP_LSH); }
+		{ write_exp_elt_opcode (pstate, BINOP_LSH); }
 |	ShiftExpression RSH AdditiveExpression
-		{ write_exp_elt_opcode (BINOP_RSH); }
+		{ write_exp_elt_opcode (pstate, BINOP_RSH); }
 /* |	ShiftExpression >>> AdditiveExpression { FIXME } */
 ;
 
 RelationalExpression:
 	ShiftExpression
 |	RelationalExpression '<' ShiftExpression
-		{ write_exp_elt_opcode (BINOP_LESS); }
+		{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 |	RelationalExpression '>' ShiftExpression
-		{ write_exp_elt_opcode (BINOP_GTR); }
+		{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 |	RelationalExpression LEQ ShiftExpression
-		{ write_exp_elt_opcode (BINOP_LEQ); }
+		{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 |	RelationalExpression GEQ ShiftExpression
-		{ write_exp_elt_opcode (BINOP_GEQ); }
+		{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 /* | RelationalExpresion INSTANCEOF ReferenceType { FIXME } */
 ;
 
 EqualityExpression:
 	RelationalExpression
 |	EqualityExpression EQUAL RelationalExpression
-		{ write_exp_elt_opcode (BINOP_EQUAL); }
+		{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 |	EqualityExpression NOTEQUAL RelationalExpression
-		{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+		{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 ;
 
 AndExpression:
 	EqualityExpression
 |	AndExpression '&' EqualityExpression
-		{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+		{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 ;
 
 ExclusiveOrExpression:
 	AndExpression
 |	ExclusiveOrExpression '^' AndExpression
-		{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+		{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 ;
 InclusiveOrExpression:
 	ExclusiveOrExpression
 |	InclusiveOrExpression '|' ExclusiveOrExpression
-		{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+		{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 ;
 
 ConditionalAndExpression:
 	InclusiveOrExpression
 |	ConditionalAndExpression ANDAND InclusiveOrExpression
-		{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+		{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 ;
 
 ConditionalOrExpression:
 	ConditionalAndExpression
 |	ConditionalOrExpression OROR ConditionalAndExpression
-		{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+		{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 ;
 
 ConditionalExpression:
 	ConditionalOrExpression
 |	ConditionalOrExpression '?' Expression ':' ConditionalExpression
-		{ write_exp_elt_opcode (TERNOP_COND); }
+		{ write_exp_elt_opcode (pstate, TERNOP_COND); }
 ;
 
 AssignmentExpression:
@@ -671,16 +689,16 @@ AssignmentExpression:
 			  
 Assignment:
 	LeftHandSide '=' ConditionalExpression
-		{ write_exp_elt_opcode (BINOP_ASSIGN); }
+		{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 |	LeftHandSide ASSIGN_MODIFY ConditionalExpression
-		{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
-		  write_exp_elt_opcode ($2);
-		  write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
+		{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+		  write_exp_elt_opcode (pstate, $2);
+		  write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY); }
 ;
 
 LeftHandSide:
 	ForcedName
-		{ push_expression_name ($1); }
+		{ push_expression_name (pstate, $1); }
 |	VARIABLE
 		/* Already written by write_dollar_variable.  */
 |	FieldAccess
@@ -700,7 +718,8 @@ Expression:
 /*** Needs some error checking for the float case ***/
 
 static int
-parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
+parse_number (struct parser_state *par_state,
+	      const char *p, int len, int parsed_float, YYSTYPE *putithere)
 {
   ULONGEST n = 0;
   ULONGEST limit, limit_div_base;
@@ -721,16 +740,17 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
       suffix_len = p + len - suffix;
 
       if (suffix_len == 0)
-	putithere->typed_val_float.type = parse_type->builtin_double;
+	putithere->typed_val_float.type
+	  = parse_type (par_state)->builtin_double;
       else if (suffix_len == 1)
 	{
 	  /* See if it has `f' or `d' suffix (float or double).  */
 	  if (tolower (*suffix) == 'f')
 	    putithere->typed_val_float.type =
-	      parse_type->builtin_float;
+	      parse_type (par_state)->builtin_float;
 	  else if (tolower (*suffix) == 'd')
 	    putithere->typed_val_float.type =
-	      parse_type->builtin_double;
+	      parse_type (par_state)->builtin_double;
 	  else
 	    return ERROR;
 	}
@@ -777,12 +797,12 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
   limit = ((limit << 16) << 16) | limit;
   if (c == 'l' || c == 'L')
     {
-      type = parse_java_type->builtin_long;
+      type = parse_java_type (par_state)->builtin_long;
       len--;
     }
   else
     {
-      type = parse_java_type->builtin_int;
+      type = parse_java_type (par_state)->builtin_int;
     }
   limit_div_base = limit / (ULONGEST) base;
 
@@ -807,11 +827,13 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 
   /* If the type is bigger than a 32-bit signed integer can be, implicitly
      promote to long.  Java does not do this, so mark it as
-     parse_type->builtin_uint64 rather than parse_java_type->builtin_long.
+     parse_type (par_state)->builtin_uint64 rather than
+     parse_java_type (par_state)->builtin_long.
      0x80000000 will become -0x80000000 instead of 0x80000000L, because we
      don't know the sign at this point.  */
-  if (type == parse_java_type->builtin_int && n > (ULONGEST)0x80000000)
-    type = parse_type->builtin_uint64;
+  if (type == parse_java_type (par_state)->builtin_int
+      && n > (ULONGEST)0x80000000)
+    type = parse_type (par_state)->builtin_uint64;
 
   putithere->typed_val_int.val = n;
   putithere->typed_val_int.type = type;
@@ -909,12 +931,12 @@ yylex (void)
       lexptr++;
       c = *lexptr++;
       if (c == '\\')
-	c = parse_escape (parse_gdbarch, &lexptr);
+	c = parse_escape (parse_gdbarch (pstate), &lexptr);
       else if (c == '\'')
 	error (_("Empty character constant"));
 
       yylval.typed_val_int.val = c;
-      yylval.typed_val_int.type = parse_java_type->builtin_char;
+      yylval.typed_val_int.type = parse_java_type (pstate)->builtin_char;
 
       c = *lexptr++;
       if (c != '\'')
@@ -1007,7 +1029,8 @@ yylex (void)
 				  && (*p < 'A' || *p > 'Z')))
 	      break;
 	  }
-	toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
+	toktype = parse_number (pstate, tokstart, p - tokstart,
+				got_dot|got_e, &yylval);
         if (toktype == ERROR)
 	  {
 	    char *err_copy = (char *) alloca (p - tokstart + 1);
@@ -1072,7 +1095,7 @@ yylex (void)
 	    break;
 	  case '\\':
 	    tokptr++;
-	    c = parse_escape (parse_gdbarch, &tokptr);
+	    c = parse_escape (parse_gdbarch (pstate), &tokptr);
 	    if (c == -1)
 	      {
 		continue;
@@ -1184,7 +1207,7 @@ yylex (void)
 
   if (*tokstart == '$')
     {
-      write_dollar_variable (yylval.sval);
+      write_dollar_variable (pstate, yylval.sval);
       return VARIABLE;
     }
 
@@ -1195,13 +1218,29 @@ yylex (void)
        (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
     {
       YYSTYPE newlval;	/* Its value is ignored.  */
-      int hextype = parse_number (tokstart, namelen, 0, &newlval);
+      int hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
       if (hextype == INTEGER_LITERAL)
 	return NAME_OR_INT;
     }
   return IDENTIFIER;
 }
 
+int
+java_parse (struct parser_state *par_state)
+{
+  int result;
+  struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  result = yyparse ();
+  do_cleanups (c);
+
+  return result;
+}
+
 void
 yyerror (char *msg)
 {
@@ -1228,11 +1267,12 @@ java_type_from_name (struct stoken name)
    Otherwise, return 0.  */
 
 static int
-push_variable (struct stoken name)
+push_variable (struct parser_state *par_state, struct stoken name)
 {
   char *tmp = copy_name (name);
   struct field_of_this_result is_a_field_of_this;
   struct symbol *sym;
+
   sym = lookup_symbol (tmp, expression_context_block, VAR_DOMAIN,
 		       &is_a_field_of_this);
   if (sym && SYMBOL_CLASS (sym) != LOC_TYPEDEF)
@@ -1244,12 +1284,12 @@ push_variable (struct stoken name)
 	    innermost_block = block_found;
 	}
 
-      write_exp_elt_opcode (OP_VAR_VALUE);
+      write_exp_elt_opcode (par_state, OP_VAR_VALUE);
       /* We want to use the selected frame, not another more inner frame
 	 which happens to be in the same block.  */
-      write_exp_elt_block (NULL);
-      write_exp_elt_sym (sym);
-      write_exp_elt_opcode (OP_VAR_VALUE);
+      write_exp_elt_block (par_state, NULL);
+      write_exp_elt_sym (par_state, sym);
+      write_exp_elt_opcode (par_state, OP_VAR_VALUE);
       return 1;
     }
   if (is_a_field_of_this.type != NULL)
@@ -1259,11 +1299,11 @@ push_variable (struct stoken name)
       if (innermost_block == 0 || 
 	  contained_in (block_found, innermost_block))
 	innermost_block = block_found;
-      write_exp_elt_opcode (OP_THIS);
-      write_exp_elt_opcode (OP_THIS);
-      write_exp_elt_opcode (STRUCTOP_PTR);
-      write_exp_string (name);
-      write_exp_elt_opcode (STRUCTOP_PTR);
+      write_exp_elt_opcode (par_state, OP_THIS);
+      write_exp_elt_opcode (par_state, OP_THIS);
+      write_exp_elt_opcode (par_state, STRUCTOP_PTR);
+      write_exp_string (par_state, name);
+      write_exp_elt_opcode (par_state, STRUCTOP_PTR);
       return 1;
     }
   return 0;
@@ -1274,7 +1314,7 @@ push_variable (struct stoken name)
    qualified name (has '.'), generate a field access for each part.  */
 
 static void
-push_fieldnames (struct stoken name)
+push_fieldnames (struct parser_state *par_state, struct stoken name)
 {
   int i;
   struct stoken token;
@@ -1285,9 +1325,9 @@ push_fieldnames (struct stoken name)
 	{
 	  /* token.ptr is start of current field name.  */
 	  token.length = &name.ptr[i] - token.ptr;
-	  write_exp_elt_opcode (STRUCTOP_PTR);
-	  write_exp_string (token);
-	  write_exp_elt_opcode (STRUCTOP_PTR);
+	  write_exp_elt_opcode (par_state, STRUCTOP_PTR);
+	  write_exp_string (par_state, token);
+	  write_exp_elt_opcode (par_state, STRUCTOP_PTR);
 	  token.ptr += token.length + 1;
 	}
       if (i >= name.length)
@@ -1299,7 +1339,8 @@ push_fieldnames (struct stoken name)
    Handle a qualified name, where DOT_INDEX is the index of the first '.' */
 
 static void
-push_qualified_expression_name (struct stoken name, int dot_index)
+push_qualified_expression_name (struct parser_state *par_state,
+				struct stoken name, int dot_index)
 {
   struct stoken token;
   char *tmp;
@@ -1308,11 +1349,11 @@ push_qualified_expression_name (struct stoken name, int dot_index)
   token.ptr = name.ptr;
   token.length = dot_index;
 
-  if (push_variable (token))
+  if (push_variable (par_state, token))
     {
       token.ptr = name.ptr + dot_index + 1;
       token.length = name.length - dot_index - 1;
-      push_fieldnames (token);
+      push_fieldnames (par_state, token);
       return;
     }
 
@@ -1326,9 +1367,9 @@ push_qualified_expression_name (struct stoken name, int dot_index)
 	{
 	  if (dot_index == name.length)
 	    {
-	      write_exp_elt_opcode(OP_TYPE);
-	      write_exp_elt_type(typ);
-	      write_exp_elt_opcode(OP_TYPE);
+	      write_exp_elt_opcode (par_state, OP_TYPE);
+	      write_exp_elt_type (par_state, typ);
+	      write_exp_elt_opcode (par_state, OP_TYPE);
 	      return;
 	    }
 	  dot_index++;  /* Skip '.' */
@@ -1339,16 +1380,16 @@ push_qualified_expression_name (struct stoken name, int dot_index)
 	    dot_index++;
 	  token.ptr = name.ptr;
 	  token.length = dot_index;
-	  write_exp_elt_opcode (OP_SCOPE);
-	  write_exp_elt_type (typ);
-	  write_exp_string (token);
-	  write_exp_elt_opcode (OP_SCOPE); 
+	  write_exp_elt_opcode (par_state, OP_SCOPE);
+	  write_exp_elt_type (par_state, typ);
+	  write_exp_string (par_state, token);
+	  write_exp_elt_opcode (par_state, OP_SCOPE); 
 	  if (dot_index < name.length)
 	    {
 	      dot_index++;
 	      name.ptr += dot_index;
 	      name.length -= dot_index;
-	      push_fieldnames (name);
+	      push_fieldnames (par_state, name);
 	    }
 	  return;
 	}
@@ -1365,7 +1406,7 @@ push_qualified_expression_name (struct stoken name, int dot_index)
    Handle VAR, TYPE, TYPE.FIELD1....FIELDN and VAR.FIELD1....FIELDN.  */
 
 static void
-push_expression_name (struct stoken name)
+push_expression_name (struct parser_state *par_state, struct stoken name)
 {
   char *tmp;
   struct type *typ;
@@ -1376,22 +1417,22 @@ push_expression_name (struct stoken name)
       if (name.ptr[i] == '.')
 	{
 	  /* It's a Qualified Expression Name.  */
-	  push_qualified_expression_name (name, i);
+	  push_qualified_expression_name (par_state, name, i);
 	  return;
 	}
     }
 
   /* It's a Simple Expression Name.  */
   
-  if (push_variable (name))
+  if (push_variable (par_state, name))
     return;
   tmp = copy_name (name);
   typ = java_lookup_class (tmp);
   if (typ != NULL)
     {
-      write_exp_elt_opcode(OP_TYPE);
-      write_exp_elt_type(typ);
-      write_exp_elt_opcode(OP_TYPE);
+      write_exp_elt_opcode (par_state, OP_TYPE);
+      write_exp_elt_type (par_state, typ);
+      write_exp_elt_opcode (par_state, OP_TYPE);
     }
   else
     {
@@ -1399,7 +1440,7 @@ push_expression_name (struct stoken name)
 
       msymbol = lookup_bound_minimal_symbol (tmp);
       if (msymbol.minsym != NULL)
-	write_exp_msymbol (msymbol);
+	write_exp_msymbol (par_state, msymbol);
       else if (!have_full_symbols () && !have_partial_symbols ())
 	error (_("No symbol table is loaded.  Use the \"file\" command"));
       else
@@ -1423,6 +1464,7 @@ copy_exp (struct expression *expr, int endpos)
   int len = length_of_subexp (expr, endpos);
   struct expression *new
     = (struct expression *) malloc (sizeof (*new) + EXP_ELEM_TO_BYTES (len));
+
   new->nelts = len;
   memcpy (new->elts, expr->elts + endpos - len, EXP_ELEM_TO_BYTES (len));
   new->language_defn = 0;
@@ -1432,27 +1474,19 @@ copy_exp (struct expression *expr, int endpos)
 
 /* Insert the expression NEW into the current expression (expout) at POS.  */
 static void
-insert_exp (int pos, struct expression *new)
+insert_exp (struct parser_state *par_state, int pos, struct expression *new)
 {
   int newlen = new->nelts;
+  int i;
 
   /* Grow expout if necessary.  In this function's only use at present,
      this should never be necessary.  */
-  if (expout_ptr + newlen > expout_size)
-    {
-      expout_size = max (expout_size * 2, expout_ptr + newlen + 10);
-      expout = (struct expression *)
-	realloc ((char *) expout, (sizeof (struct expression)
-				    + EXP_ELEM_TO_BYTES (expout_size)));
-    }
-
-  {
-    int i;
+  increase_expout_size (par_state, newlen);
 
-    for (i = expout_ptr - 1; i >= pos; i--)
-      expout->elts[i + newlen] = expout->elts[i];
-  }
+  for (i = par_state->expout_ptr - 1; i >= pos; i--)
+    par_state->expout->elts[i + newlen] = par_state->expout->elts[i];
   
-  memcpy (expout->elts + pos, new->elts, EXP_ELEM_TO_BYTES (newlen));
-  expout_ptr += newlen;
+  memcpy (par_state->expout->elts + pos, new->elts,
+	  EXP_ELEM_TO_BYTES (newlen));
+  par_state->expout_ptr += newlen;
 }
diff --git a/gdb/jv-lang.h b/gdb/jv-lang.h
index 43feec7..345cc91 100644
--- a/gdb/jv-lang.h
+++ b/gdb/jv-lang.h
@@ -22,8 +22,9 @@
 
 struct value;
 struct type_print_options;
+struct parser_state;
 
-extern int java_parse (void);		/* Defined in jv-exp.y */
+extern int java_parse (struct parser_state *); /* Defined in jv-exp.y */
 
 extern void java_error (char *);	/* Defined in jv-exp.y */
 
diff --git a/gdb/language.c b/gdb/language.c
index ae0fa15..d5502f2 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -50,7 +50,7 @@ extern void _initialize_language (void);
 
 static void unk_lang_error (char *);
 
-static int unk_lang_parser (void);
+static int unk_lang_parser (struct parser_state *);
 
 static void show_check (char *, int);
 
@@ -694,7 +694,7 @@ default_get_string (struct value *value, gdb_byte **buffer, int *length,
 /* Define the language that is no language.  */
 
 static int
-unk_lang_parser (void)
+unk_lang_parser (struct parser_state *ps)
 {
   return 1;
 }
diff --git a/gdb/language.h b/gdb/language.h
index ded595f..9e95bf2 100644
--- a/gdb/language.h
+++ b/gdb/language.h
@@ -34,6 +34,7 @@ struct ui_file;
 struct value_print_options;
 struct type_print_options;
 struct lang_varobj_ops;
+struct parser_state;
 
 #define MAX_FORTRAN_DIMS  7	/* Maximum number of F77 array dims.  */
 
@@ -164,7 +165,7 @@ struct language_defn
 
     /* Parser function.  */
 
-    int (*la_parser) (void);
+    int (*la_parser) (struct parser_state *);
 
     /* Parser error function.  */
 
diff --git a/gdb/m2-exp.y b/gdb/m2-exp.y
index 07aa986..917a028 100644
--- a/gdb/m2-exp.y
+++ b/gdb/m2-exp.y
@@ -49,8 +49,8 @@
 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
 #include "block.h"
 
-#define parse_type builtin_type (parse_gdbarch)
-#define parse_m2_type builtin_m2_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
+#define parse_m2_type(ps) builtin_m2_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -60,7 +60,7 @@
    generators need to be fixed instead of adding those names to this list.  */
 
 #define	yymaxdepth m2_maxdepth
-#define	yyparse	m2_parse
+#define	yyparse	m2_parse_internal
 #define	yylex	m2_lex
 #define	yyerror	m2_error
 #define	yylval	m2_lval
@@ -112,6 +112,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -204,31 +209,31 @@ start   :	exp
 	;
 
 type_exp:	type
-		{ write_exp_elt_opcode(OP_TYPE);
-		  write_exp_elt_type($1);
-		  write_exp_elt_opcode(OP_TYPE);
+		{ write_exp_elt_opcode (pstate, OP_TYPE);
+		  write_exp_elt_type (pstate, $1);
+		  write_exp_elt_opcode (pstate, OP_TYPE);
 		}
 	;
 
 /* Expressions */
 
 exp     :       exp '^'   %prec UNARY
-                        { write_exp_elt_opcode (UNOP_IND); }
+                        { write_exp_elt_opcode (pstate, UNOP_IND); }
 	;
 
 exp	:	'-'
 			{ number_sign = -1; }
 		exp    %prec UNARY
 			{ number_sign = 1;
-			  write_exp_elt_opcode (UNOP_NEG); }
+			  write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 exp	:	'+' exp    %prec UNARY
-		{ write_exp_elt_opcode(UNOP_PLUS); }
+		{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
 	;
 
 exp	:	not_exp exp %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 not_exp	:	NOT
@@ -236,88 +241,90 @@ not_exp	:	NOT
 	;
 
 exp	:	CAP '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_CAP); }
+			{ write_exp_elt_opcode (pstate, UNOP_CAP); }
 	;
 
 exp	:	ORD '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_ORD); }
+			{ write_exp_elt_opcode (pstate, UNOP_ORD); }
 	;
 
 exp	:	ABS '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_ABS); }
+			{ write_exp_elt_opcode (pstate, UNOP_ABS); }
 	;
 
 exp	: 	HIGH '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_HIGH); }
+			{ write_exp_elt_opcode (pstate, UNOP_HIGH); }
 	;
 
 exp 	:	MIN_FUNC '(' type ')'
-			{ write_exp_elt_opcode (UNOP_MIN);
-			  write_exp_elt_type ($3);
-			  write_exp_elt_opcode (UNOP_MIN); }
+			{ write_exp_elt_opcode (pstate, UNOP_MIN);
+			  write_exp_elt_type (pstate, $3);
+			  write_exp_elt_opcode (pstate, UNOP_MIN); }
 	;
 
 exp	: 	MAX_FUNC '(' type ')'
-			{ write_exp_elt_opcode (UNOP_MAX);
-			  write_exp_elt_type ($3);
-			  write_exp_elt_opcode (UNOP_MAX); }
+			{ write_exp_elt_opcode (pstate, UNOP_MAX);
+			  write_exp_elt_type (pstate, $3);
+			  write_exp_elt_opcode (pstate, UNOP_MAX); }
 	;
 
 exp	:	FLOAT_FUNC '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_FLOAT); }
+			{ write_exp_elt_opcode (pstate, UNOP_FLOAT); }
 	;
 
 exp	:	VAL '(' type ',' exp ')'
-			{ write_exp_elt_opcode (BINOP_VAL);
-			  write_exp_elt_type ($3);
-			  write_exp_elt_opcode (BINOP_VAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_VAL);
+			  write_exp_elt_type (pstate, $3);
+			  write_exp_elt_opcode (pstate, BINOP_VAL); }
 	;
 
 exp	:	CHR '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_CHR); }
+			{ write_exp_elt_opcode (pstate, UNOP_CHR); }
 	;
 
 exp	:	ODD '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_ODD); }
+			{ write_exp_elt_opcode (pstate, UNOP_ODD); }
 	;
 
 exp	:	TRUNC '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_TRUNC); }
+			{ write_exp_elt_opcode (pstate, UNOP_TRUNC); }
 	;
 
 exp	:	TSIZE '(' exp ')'
-			{ write_exp_elt_opcode (UNOP_SIZEOF); }
+			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
 	;
 
 exp	:	SIZE exp       %prec UNARY
-			{ write_exp_elt_opcode (UNOP_SIZEOF); }
+			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
 	;
 
 
 exp	:	INC '(' exp ')'
-			{ write_exp_elt_opcode(UNOP_PREINCREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
 	;
 
 exp	:	INC '(' exp ',' exp ')'
-			{ write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode(BINOP_ADD);
-			  write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+			  write_exp_elt_opcode (pstate, BINOP_ADD);
+			  write_exp_elt_opcode (pstate,
+						BINOP_ASSIGN_MODIFY); }
 	;
 
 exp	:	DEC '(' exp ')'
-			{ write_exp_elt_opcode(UNOP_PREDECREMENT);}
+			{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT);}
 	;
 
 exp	:	DEC '(' exp ',' exp ')'
-			{ write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
-			  write_exp_elt_opcode(BINOP_SUB);
-			  write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
+			  write_exp_elt_opcode (pstate, BINOP_SUB);
+			  write_exp_elt_opcode (pstate,
+						BINOP_ASSIGN_MODIFY); }
 	;
 
 exp	:	exp DOT NAME
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	set
@@ -349,13 +356,14 @@ exp     :       exp '['
 			   function types */
                         { start_arglist(); }
                 non_empty_arglist ']'  %prec DOT
-                        { write_exp_elt_opcode (MULTI_SUBSCRIPT);
-			  write_exp_elt_longcst ((LONGEST) end_arglist());
-			  write_exp_elt_opcode (MULTI_SUBSCRIPT); }
+                        { write_exp_elt_opcode (pstate, MULTI_SUBSCRIPT);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist());
+			  write_exp_elt_opcode (pstate, MULTI_SUBSCRIPT); }
         ;
 
 exp	:	exp '[' exp ']'
-			{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
 	;
 
 exp	:	exp '('
@@ -363,9 +371,10 @@ exp	:	exp '('
 			   being accumulated by an outer function call.  */
 			{ start_arglist (); }
 		arglist ')'	%prec DOT
-			{ write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_FUNCALL); }
+			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate, OP_FUNCALL); }
 	;
 
 arglist	:
@@ -391,15 +400,15 @@ non_empty_arglist
 
 /* GDB construct */
 exp	:	'{' type '}' exp  %prec UNARY
-			{ write_exp_elt_opcode (UNOP_MEMVAL);
-			  write_exp_elt_type ($2);
-			  write_exp_elt_opcode (UNOP_MEMVAL); }
+			{ write_exp_elt_opcode (pstate, UNOP_MEMVAL);
+			  write_exp_elt_type (pstate, $2);
+			  write_exp_elt_opcode (pstate, UNOP_MEMVAL); }
 	;
 
 exp     :       type '(' exp ')' %prec UNARY
-                        { write_exp_elt_opcode (UNOP_CAST);
-			  write_exp_elt_type ($1);
-			  write_exp_elt_opcode (UNOP_CAST); }
+                        { write_exp_elt_opcode (pstate, UNOP_CAST);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, UNOP_CAST); }
 	;
 
 exp	:	'(' exp ')'
@@ -411,131 +420,140 @@ exp	:	'(' exp ')'
 
 /* GDB construct */
 exp	:	exp '@' exp
-			{ write_exp_elt_opcode (BINOP_REPEAT); }
+			{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
 	;
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 exp	:	exp '/' exp
-			{ write_exp_elt_opcode (BINOP_DIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_DIV); }
 	;
 
 exp     :       exp DIV exp
-                        { write_exp_elt_opcode (BINOP_INTDIV); }
+                        { write_exp_elt_opcode (pstate, BINOP_INTDIV); }
         ;
 
 exp	:	exp MOD exp
-			{ write_exp_elt_opcode (BINOP_REM); }
+			{ write_exp_elt_opcode (pstate, BINOP_REM); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (BINOP_EQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
         |       exp '#' exp
-                        { write_exp_elt_opcode (BINOP_NOTEQUAL); }
+                        { write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (BINOP_LEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (BINOP_GEQ); }
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
 	;
 
 exp	:	exp '<' exp
-			{ write_exp_elt_opcode (BINOP_LESS); }
+			{ write_exp_elt_opcode (pstate, BINOP_LESS); }
 	;
 
 exp	:	exp '>' exp
-			{ write_exp_elt_opcode (BINOP_GTR); }
+			{ write_exp_elt_opcode (pstate, BINOP_GTR); }
 	;
 
 exp	:	exp LOGICAL_AND exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
 	;
 
 exp	:	exp OROR exp
-			{ write_exp_elt_opcode (BINOP_LOGICAL_OR); }
+			{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
 	;
 
 exp	:	exp ASSIGN exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 
 /* Constants */
 
 exp	:	M2_TRUE
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 exp	:	M2_FALSE
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_m2_type->builtin_int);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					parse_m2_type (pstate)->builtin_int);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	UINT
 			{
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_m2_type->builtin_card);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					      parse_m2_type (pstate)
+					      ->builtin_card);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			}
 	;
 
 exp	:	CHAR
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_m2_type->builtin_char);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					      parse_m2_type (pstate)
+					      ->builtin_char);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type (parse_m2_type->builtin_real);
-			  write_exp_elt_dblcst ($1);
-			  write_exp_elt_opcode (OP_DOUBLE); }
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate,
+					      parse_m2_type (pstate)
+					      ->builtin_real);
+			  write_exp_elt_dblcst (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 	;
 
 exp	:	variable
 	;
 
 exp	:	SIZE '(' type ')'	%prec UNARY
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_type->builtin_int);
-			  write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
-			  write_exp_elt_opcode (OP_LONG); }
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					    parse_type (pstate)->builtin_int);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) TYPE_LENGTH ($3));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	STRING
-			{ write_exp_elt_opcode (OP_M2_STRING);
-			  write_exp_string ($1);
-			  write_exp_elt_opcode (OP_M2_STRING); }
+			{ write_exp_elt_opcode (pstate, OP_M2_STRING);
+			  write_exp_string (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_M2_STRING); }
 	;
 
 /* This will be used for extensions later.  Like adding modules.  */
@@ -545,7 +563,8 @@ block	:	fblock
 
 fblock	:	BLOCKNAME
 			{ struct symbol *sym
-			    = lookup_symbol (copy_name ($1), expression_context_block,
+			    = lookup_symbol (copy_name ($1),
+					     expression_context_block,
 					     VAR_DOMAIN, 0);
 			  $$ = sym;}
 	;
@@ -565,10 +584,10 @@ fblock	:	block COLONCOLON BLOCKNAME
 
 /* Useful for assigning to PROCEDURE variables */
 variable:	fblock
-			{ write_exp_elt_opcode(OP_VAR_VALUE);
-			  write_exp_elt_block (NULL);
-			  write_exp_elt_sym ($1);
-			  write_exp_elt_opcode (OP_VAR_VALUE); }
+			{ write_exp_elt_opcode (pstate, OP_VAR_VALUE);
+			  write_exp_elt_block (pstate, NULL);
+			  write_exp_elt_sym (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
 	;
 
 /* GDB internal ($foo) variable */
@@ -591,11 +610,11 @@ variable:	block COLONCOLON NAME
 				innermost_block = block_found;
 			    }
 
-			  write_exp_elt_opcode (OP_VAR_VALUE);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			  /* block_found is set by lookup_symbol.  */
-			  write_exp_elt_block (block_found);
-			  write_exp_elt_sym (sym);
-			  write_exp_elt_opcode (OP_VAR_VALUE); }
+			  write_exp_elt_block (pstate, block_found);
+			  write_exp_elt_sym (pstate, sym);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
 	;
 
 /* Base case for variables.  */
@@ -617,13 +636,13 @@ variable:	NAME
 				    innermost_block = block_found;
 				}
 
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to
 				 be in the same block.  */
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			    }
 			  else
 			    {
@@ -633,7 +652,7 @@ variable:	NAME
 			      msymbol =
 				lookup_bound_minimal_symbol (arg);
 			      if (msymbol.minsym != NULL)
-				write_exp_msymbol (msymbol);
+				write_exp_msymbol (pstate, msymbol);
 			      else if (!have_full_symbols () && !have_partial_symbols ())
 				error (_("No symbol table is loaded.  Use the \"symbol-file\" command."));
 			      else
@@ -645,7 +664,8 @@ variable:	NAME
 
 type
 	:	TYPENAME
-			{ $$ = lookup_typename (parse_language, parse_gdbarch,
+			{ $$ = lookup_typename (parse_language (pstate),
+						parse_gdbarch (pstate),
 						copy_name ($1),
 						expression_context_block, 0); }
 
@@ -805,8 +825,8 @@ static struct keyword keytab[] =
 
 /* Read one token, getting characters through lexptr.  */
 
-/* This is where we will check to make sure that the language and the operators used are
-   compatible  */
+/* This is where we will check to make sure that the language and the
+   operators used are compatible  */
 
 static int
 yylex (void)
@@ -992,7 +1012,7 @@ yylex (void)
 
   if (*tokstart == '$')
     {
-      write_dollar_variable (yylval.sval);
+      write_dollar_variable (pstate, yylval.sval);
       return INTERNAL_VAR;
     }
 
@@ -1012,8 +1032,9 @@ yylex (void)
     sym = lookup_symbol (tmp, expression_context_block, VAR_DOMAIN, 0);
     if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
       return BLOCKNAME;
-    if (lookup_typename (parse_language, parse_gdbarch,
-			 copy_name (yylval.sval), expression_context_block, 1))
+    if (lookup_typename (parse_language (pstate), parse_gdbarch (pstate),
+			 copy_name (yylval.sval),
+			 expression_context_block, 1))
       return TYPENAME;
 
     if(sym)
@@ -1070,6 +1091,22 @@ yylex (void)
  }
 }
 
+int
+m2_parse (struct parser_state *par_state)
+{
+  int result;
+  struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  result = yyparse ();
+  do_cleanups (c);
+
+  return result;
+}
+
 void
 yyerror (char *msg)
 {
diff --git a/gdb/m2-lang.h b/gdb/m2-lang.h
index 772221f..d363975 100644
--- a/gdb/m2-lang.h
+++ b/gdb/m2-lang.h
@@ -18,8 +18,9 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 struct type_print_options;
+struct parser_state;
 
-extern int m2_parse (void);	/* Defined in m2-exp.y */
+extern int m2_parse (struct parser_state *); /* Defined in m2-exp.y */
 
 extern void m2_error (char *);	/* Defined in m2-exp.y */
 
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 4327895..68f0d10 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -465,7 +465,7 @@ add_msglist(struct stoken *str, int addcolon)
 }
 
 int
-end_msglist(void)
+end_msglist (struct parser_state *ps)
 {
   int val = msglist_len;
   struct selname *sel = selname_chain;
@@ -475,12 +475,12 @@ end_msglist(void)
   selname_chain = sel->next;
   msglist_len = sel->msglist_len;
   msglist_sel = sel->msglist_sel;
-  selid = lookup_child_selector (parse_gdbarch, p);
+  selid = lookup_child_selector (parse_gdbarch (ps), p);
   if (!selid)
     error (_("Can't find selector \"%s\""), p);
-  write_exp_elt_longcst (selid);
+  write_exp_elt_longcst (ps, selid);
   xfree(p);
-  write_exp_elt_longcst (val);	/* Number of args */
+  write_exp_elt_longcst (ps, val);	/* Number of args */
   xfree(sel);
 
   return val;
diff --git a/gdb/objc-lang.h b/gdb/objc-lang.h
index 6ba576a..df1fe53 100644
--- a/gdb/objc-lang.h
+++ b/gdb/objc-lang.h
@@ -26,6 +26,7 @@ struct stoken;
 
 struct value;
 struct block;
+struct parser_state;
 
 extern CORE_ADDR lookup_objc_class     (struct gdbarch *gdbarch,
 					char *classname);
@@ -45,7 +46,7 @@ extern struct value *value_nsstring (struct gdbarch *gdbarch,
 /* for parsing Objective C */
 extern void start_msglist (void);
 extern void add_msglist (struct stoken *str, int addcolon);
-extern int end_msglist (void);
+extern int end_msglist (struct parser_state *);
 
 struct symbol *lookup_struct_typedef (char *name, const struct block *block,
 				      int noerr);
diff --git a/gdb/p-exp.y b/gdb/p-exp.y
index f1c91ba..4e8f96c 100644
--- a/gdb/p-exp.y
+++ b/gdb/p-exp.y
@@ -57,7 +57,7 @@
 #include "block.h"
 #include "completer.h"
 
-#define parse_type builtin_type (parse_gdbarch)
+#define parse_type(ps) builtin_type (parse_gdbarch (ps))
 
 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
    as well as gratuitiously global symbol names, so we can have multiple
@@ -67,7 +67,7 @@
    generators need to be fixed instead of adding those names to this list.  */
 
 #define	yymaxdepth pascal_maxdepth
-#define	yyparse	pascal_parse
+#define	yyparse	pascal_parse_internal
 #define	yylex	pascal_lex
 #define	yyerror	pascal_error
 #define	yylval	pascal_lval
@@ -119,6 +119,11 @@
 
 #define YYFPRINTF parser_fprintf
 
+/* The state of the parser, used internally when we are parsing the
+   expression.  */
+
+static struct parser_state *pstate = NULL;
+
 int yyparse (void);
 
 static int yylex (void);
@@ -159,7 +164,8 @@ static char *uptok (const char *, int);
 
 %{
 /* YYSTYPE gets defined by %union */
-static int parse_number (const char *, int, int, YYSTYPE *);
+static int parse_number (struct parser_state *,
+			 const char *, int, int, YYSTYPE *);
 
 static struct type *current_type;
 static struct internalvar *intvar;
@@ -252,44 +258,44 @@ normal_start	:
 	;
 
 type_exp:	type
-			{ write_exp_elt_opcode(OP_TYPE);
-			  write_exp_elt_type($1);
-			  write_exp_elt_opcode(OP_TYPE);
+			{ write_exp_elt_opcode (pstate, OP_TYPE);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, OP_TYPE);
 			  current_type = $1; } ;
 
 /* Expressions, including the comma operator.  */
 exp1	:	exp
 	|	exp1 ',' exp
-			{ write_exp_elt_opcode (BINOP_COMMA); }
+			{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
 	;
 
 /* Expressions, not including the comma operator.  */
 exp	:	exp '^'   %prec UNARY
-			{ write_exp_elt_opcode (UNOP_IND);
+			{ write_exp_elt_opcode (pstate, UNOP_IND);
 			  if (current_type)
 			    current_type = TYPE_TARGET_TYPE (current_type); }
 	;
 
 exp	:	'@' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_ADDR);
+			{ write_exp_elt_opcode (pstate, UNOP_ADDR);
 			  if (current_type)
 			    current_type = TYPE_POINTER_TYPE (current_type); }
 	;
 
 exp	:	'-' exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_NEG); }
+			{ write_exp_elt_opcode (pstate, UNOP_NEG); }
 	;
 
 exp	:	NOT exp    %prec UNARY
-			{ write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
+			{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
 	;
 
 exp	:	INCREMENT '(' exp ')'   %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PREINCREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
 	;
 
 exp	:	DECREMENT  '(' exp ')'   %prec UNARY
-			{ write_exp_elt_opcode (UNOP_PREDECREMENT); }
+			{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT); }
 	;
 
 
@@ -298,9 +304,9 @@ field_exp	:	exp '.'	%prec UNARY
 	;
 
 exp	:	field_exp FIELDNAME
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($2);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $2);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			  search_field = 0;
 			  if (current_type)
 			    {
@@ -316,9 +322,9 @@ exp	:	field_exp FIELDNAME
 
 
 exp	:	field_exp name
-			{ write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($2);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
+			{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $2);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			  search_field = 0;
 			  if (current_type)
 			    {
@@ -332,19 +338,19 @@ exp	:	field_exp name
 			}
 	;
 exp	:	field_exp  name COMPLETE
-			{ mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
-			  write_exp_string ($2);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			{ mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			  write_exp_string (pstate, $2);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 exp	:	field_exp COMPLETE
 			{ struct stoken s;
-			  mark_struct_expression ();
-			  write_exp_elt_opcode (STRUCTOP_STRUCT);
+			  mark_struct_expression (pstate);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			  s.ptr = "";
 			  s.length = 0;
-			  write_exp_string (s);
-			  write_exp_elt_opcode (STRUCTOP_STRUCT); }
+			  write_exp_string (pstate, s);
+			  write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
 	;
 
 exp	:	exp '['
@@ -365,14 +371,14 @@ exp	:	exp '['
 			      strcpy (buf, arrayname);
 			      current_type = TYPE_FIELD_TYPE (current_type,
 				arrayfieldindex - 1);
-			      write_exp_elt_opcode (STRUCTOP_STRUCT);
-			      write_exp_string (stringsval);
-			      write_exp_elt_opcode (STRUCTOP_STRUCT);
+			      write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
+			      write_exp_string (pstate, stringsval);
+			      write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
 			    }
 			  push_current_type ();  }
 		exp1 ']'
 			{ pop_current_type ();
-			  write_exp_elt_opcode (BINOP_SUBSCRIPT);
+			  write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT);
 			  if (current_type)
 			    current_type = TYPE_TARGET_TYPE (current_type); }
 	;
@@ -383,9 +389,10 @@ exp	:	exp '('
 			{ push_current_type ();
 			  start_arglist (); }
 		arglist ')'	%prec ARROW
-			{ write_exp_elt_opcode (OP_FUNCALL);
-			  write_exp_elt_longcst ((LONGEST) end_arglist ());
-			  write_exp_elt_opcode (OP_FUNCALL);
+			{ write_exp_elt_opcode (pstate, OP_FUNCALL);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) end_arglist ());
+			  write_exp_elt_opcode (pstate, OP_FUNCALL);
 			  pop_current_type ();
 			  if (current_type)
  	  		    current_type = TYPE_TARGET_TYPE (current_type);
@@ -406,11 +413,11 @@ exp	:	type '(' exp ')' %prec UNARY
 			      if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
 				  && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_CLASS)
 				  && (TYPE_CODE ($1) == TYPE_CODE_CLASS))
-				write_exp_elt_opcode (UNOP_IND);
+				write_exp_elt_opcode (pstate, UNOP_IND);
 			    }
-			  write_exp_elt_opcode (UNOP_CAST);
-			  write_exp_elt_type ($1);
-			  write_exp_elt_opcode (UNOP_CAST);
+			  write_exp_elt_opcode (pstate, UNOP_CAST);
+			  write_exp_elt_type (pstate, $1);
+			  write_exp_elt_opcode (pstate, UNOP_CAST);
 			  current_type = $1; }
 	;
 
@@ -421,7 +428,7 @@ exp	:	'(' exp1 ')'
 /* Binary operators in order of decreasing precedence.  */
 
 exp	:	exp '*' exp
-			{ write_exp_elt_opcode (BINOP_MUL); }
+			{ write_exp_elt_opcode (pstate, BINOP_MUL); }
 	;
 
 exp	:	exp '/' {
@@ -433,135 +440,138 @@ exp	:	exp '/' {
 			  if (leftdiv_is_integer && current_type
 			      && is_integral_type (current_type))
 			    {
-			      write_exp_elt_opcode (UNOP_CAST);
-			      write_exp_elt_type (parse_type->builtin_long_double);
-			      current_type = parse_type->builtin_long_double;
-			      write_exp_elt_opcode (UNOP_CAST);
+			      write_exp_elt_opcode (pstate, UNOP_CAST);
+			      write_exp_elt_type (pstate,
+						  parse_type (pstate)
+						  ->builtin_long_double);
+			      current_type
+				= parse_type (pstate)->builtin_long_double;
+			      write_exp_elt_opcode (pstate, UNOP_CAST);
 			      leftdiv_is_integer = 0;
 			    }
 
-			  write_exp_elt_opcode (BINOP_DIV);
+			  write_exp_elt_opcode (pstate, BINOP_DIV);
 			}
 	;
 
 exp	:	exp DIV exp
-			{ write_exp_elt_opcode (BINOP_INTDIV); }
+			{ write_exp_elt_opcode (pstate, BINOP_INTDIV); }
 	;
 
 exp	:	exp MOD exp
-			{ write_exp_elt_opcode (BINOP_REM); }
+			{ write_exp_elt_opcode (pstate, BINOP_REM); }
 	;
 
 exp	:	exp '+' exp
-			{ write_exp_elt_opcode (BINOP_ADD); }
+			{ write_exp_elt_opcode (pstate, BINOP_ADD); }
 	;
 
 exp	:	exp '-' exp
-			{ write_exp_elt_opcode (BINOP_SUB); }
+			{ write_exp_elt_opcode (pstate, BINOP_SUB); }
 	;
 
 exp	:	exp LSH exp
-			{ write_exp_elt_opcode (BINOP_LSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_LSH); }
 	;
 
 exp	:	exp RSH exp
-			{ write_exp_elt_opcode (BINOP_RSH); }
+			{ write_exp_elt_opcode (pstate, BINOP_RSH); }
 	;
 
 exp	:	exp '=' exp
-			{ write_exp_elt_opcode (BINOP_EQUAL);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_EQUAL);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp NOTEQUAL exp
-			{ write_exp_elt_opcode (BINOP_NOTEQUAL);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp LEQ exp
-			{ write_exp_elt_opcode (BINOP_LEQ);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_LEQ);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp GEQ exp
-			{ write_exp_elt_opcode (BINOP_GEQ);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_GEQ);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp '<' exp
-			{ write_exp_elt_opcode (BINOP_LESS);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_LESS);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp '>' exp
-			{ write_exp_elt_opcode (BINOP_GTR);
-			  current_type = parse_type->builtin_bool;
+			{ write_exp_elt_opcode (pstate, BINOP_GTR);
+			  current_type = parse_type (pstate)->builtin_bool;
 			}
 	;
 
 exp	:	exp ANDAND exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_AND); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
 	;
 
 exp	:	exp XOR exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_XOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
 	;
 
 exp	:	exp OR exp
-			{ write_exp_elt_opcode (BINOP_BITWISE_IOR); }
+			{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
 	;
 
 exp	:	exp ASSIGN exp
-			{ write_exp_elt_opcode (BINOP_ASSIGN); }
+			{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
 	;
 
 exp	:	TRUEKEYWORD
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  current_type = parse_type->builtin_bool;
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  current_type = parse_type (pstate)->builtin_bool;
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 exp	:	FALSEKEYWORD
-			{ write_exp_elt_opcode (OP_BOOL);
-			  write_exp_elt_longcst ((LONGEST) $1);
-			  current_type = parse_type->builtin_bool;
-			  write_exp_elt_opcode (OP_BOOL); }
+			{ write_exp_elt_opcode (pstate, OP_BOOL);
+			  write_exp_elt_longcst (pstate, (LONGEST) $1);
+			  current_type = parse_type (pstate)->builtin_bool;
+			  write_exp_elt_opcode (pstate, OP_BOOL); }
 	;
 
 exp	:	INT
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type ($1.type);
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, $1.type);
 			  current_type = $1.type;
-			  write_exp_elt_longcst ((LONGEST)($1.val));
-			  write_exp_elt_opcode (OP_LONG); }
+			  write_exp_elt_longcst (pstate, (LONGEST)($1.val));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	NAME_OR_INT
 			{ YYSTYPE val;
-			  parse_number ($1.stoken.ptr,
+			  parse_number (pstate, $1.stoken.ptr,
 					$1.stoken.length, 0, &val);
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (val.typed_val_int.type);
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate, val.typed_val_int.type);
 			  current_type = val.typed_val_int.type;
-			  write_exp_elt_longcst ((LONGEST)
+			  write_exp_elt_longcst (pstate, (LONGEST)
 						 val.typed_val_int.val);
-			  write_exp_elt_opcode (OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_LONG);
 			}
 	;
 
 
 exp	:	FLOAT
-			{ write_exp_elt_opcode (OP_DOUBLE);
-			  write_exp_elt_type ($1.type);
+			{ write_exp_elt_opcode (pstate, OP_DOUBLE);
+			  write_exp_elt_type (pstate, $1.type);
 			  current_type = $1.type;
-			  write_exp_elt_dblcst ($1.dval);
-			  write_exp_elt_opcode (OP_DOUBLE); }
+			  write_exp_elt_dblcst (pstate, $1.dval);
+			  write_exp_elt_opcode (pstate, OP_DOUBLE); }
 	;
 
 exp	:	variable
@@ -574,7 +584,7 @@ exp	:	VARIABLE
  			     struct value * val, * mark;
 
 			     mark = value_mark ();
- 			     val = value_of_internalvar (parse_gdbarch,
+ 			     val = value_of_internalvar (parse_gdbarch (pstate),
  							 intvar);
  			     current_type = value_type (val);
 			     value_release_to_mark (mark);
@@ -583,17 +593,19 @@ exp	:	VARIABLE
  	;
 
 exp	:	SIZEOF '(' type ')'	%prec UNARY
-			{ write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_type->builtin_int);
-			  current_type = parse_type->builtin_int;
+			{ write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					    parse_type (pstate)->builtin_int);
+			  current_type = parse_type (pstate)->builtin_int;
 			  CHECK_TYPEDEF ($3);
-			  write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
-			  write_exp_elt_opcode (OP_LONG); }
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) TYPE_LENGTH ($3));
+			  write_exp_elt_opcode (pstate, OP_LONG); }
 	;
 
 exp	:	SIZEOF  '(' exp ')'      %prec UNARY
-			{ write_exp_elt_opcode (UNOP_SIZEOF);
-			  current_type = parse_type->builtin_int; }
+			{ write_exp_elt_opcode (pstate, UNOP_SIZEOF);
+			  current_type = parse_type (pstate)->builtin_int; }
 
 exp	:	STRING
 			{ /* C strings are converted into array constants with
@@ -605,19 +617,25 @@ exp	:	STRING
 
 			  while (count-- > 0)
 			    {
-			      write_exp_elt_opcode (OP_LONG);
-			      write_exp_elt_type (parse_type->builtin_char);
-			      write_exp_elt_longcst ((LONGEST)(*sp++));
-			      write_exp_elt_opcode (OP_LONG);
+			      write_exp_elt_opcode (pstate, OP_LONG);
+			      write_exp_elt_type (pstate,
+						  parse_type (pstate)
+						  ->builtin_char);
+			      write_exp_elt_longcst (pstate,
+						     (LONGEST) (*sp++));
+			      write_exp_elt_opcode (pstate, OP_LONG);
 			    }
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_type (parse_type->builtin_char);
-			  write_exp_elt_longcst ((LONGEST)'\0');
-			  write_exp_elt_opcode (OP_LONG);
-			  write_exp_elt_opcode (OP_ARRAY);
-			  write_exp_elt_longcst ((LONGEST) 0);
-			  write_exp_elt_longcst ((LONGEST) ($1.length));
-			  write_exp_elt_opcode (OP_ARRAY); }
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_type (pstate,
+					      parse_type (pstate)
+					      ->builtin_char);
+			  write_exp_elt_longcst (pstate, (LONGEST)'\0');
+			  write_exp_elt_opcode (pstate, OP_LONG);
+			  write_exp_elt_opcode (pstate, OP_ARRAY);
+			  write_exp_elt_longcst (pstate, (LONGEST) 0);
+			  write_exp_elt_longcst (pstate,
+						 (LONGEST) ($1.length));
+			  write_exp_elt_opcode (pstate, OP_ARRAY); }
 	;
 
 /* Object pascal  */
@@ -625,10 +643,11 @@ exp	:	THIS
 			{
 			  struct value * this_val;
 			  struct type * this_type;
-			  write_exp_elt_opcode (OP_THIS);
-			  write_exp_elt_opcode (OP_THIS);
+			  write_exp_elt_opcode (pstate, OP_THIS);
+			  write_exp_elt_opcode (pstate, OP_THIS);
 			  /* We need type of this.  */
-			  this_val = value_of_this_silent (parse_language);
+			  this_val
+			    = value_of_this_silent (parse_language (pstate));
 			  if (this_val)
 			    this_type = value_type (this_val);
 			  else
@@ -638,7 +657,7 @@ exp	:	THIS
 			      if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
 				{
 				  this_type = TYPE_TARGET_TYPE (this_type);
-				  write_exp_elt_opcode (UNOP_IND);
+				  write_exp_elt_opcode (pstate, UNOP_IND);
 				}
 			    }
 
@@ -684,11 +703,11 @@ variable:	block COLONCOLON name
 			    error (_("No symbol \"%s\" in specified context."),
 				   copy_name ($3));
 
-			  write_exp_elt_opcode (OP_VAR_VALUE);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			  /* block_found is set by lookup_symbol.  */
-			  write_exp_elt_block (block_found);
-			  write_exp_elt_sym (sym);
-			  write_exp_elt_opcode (OP_VAR_VALUE); }
+			  write_exp_elt_block (pstate, block_found);
+			  write_exp_elt_sym (pstate, sym);
+			  write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
 	;
 
 qualified_name:	typebase COLONCOLON name
@@ -699,10 +718,10 @@ qualified_name:	typebase COLONCOLON name
 			    error (_("`%s' is not defined as an aggregate type."),
 				   TYPE_NAME (type));
 
-			  write_exp_elt_opcode (OP_SCOPE);
-			  write_exp_elt_type (type);
-			  write_exp_string ($3);
-			  write_exp_elt_opcode (OP_SCOPE);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
+			  write_exp_elt_type (pstate, type);
+			  write_exp_string (pstate, $3);
+			  write_exp_elt_opcode (pstate, OP_SCOPE);
 			}
 	;
 
@@ -718,16 +737,16 @@ variable:	qualified_name
 					   VAR_DOMAIN, NULL);
 			  if (sym)
 			    {
-			      write_exp_elt_opcode (OP_VAR_VALUE);
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      break;
 			    }
 
 			  msymbol = lookup_bound_minimal_symbol (name);
 			  if (msymbol.minsym != NULL)
-			    write_exp_msymbol (msymbol);
+			    write_exp_msymbol (pstate, msymbol);
 			  else if (!have_full_symbols ()
 				   && !have_partial_symbols ())
 			    error (_("No symbol table is loaded.  "
@@ -751,13 +770,13 @@ variable:	name_not_typename
 				    innermost_block = block_found;
 				}
 
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to
 				 be in the same block.  */
-			      write_exp_elt_block (NULL);
-			      write_exp_elt_sym (sym);
-			      write_exp_elt_opcode (OP_VAR_VALUE);
+			      write_exp_elt_block (pstate, NULL);
+			      write_exp_elt_sym (pstate, sym);
+			      write_exp_elt_opcode (pstate, OP_VAR_VALUE);
 			      current_type = sym->type; }
 			  else if ($1.is_a_field_of_this)
 			    {
@@ -770,13 +789,14 @@ variable:	name_not_typename
 				  || contained_in (block_found,
 						   innermost_block))
 				innermost_block = block_found;
-			      write_exp_elt_opcode (OP_THIS);
-			      write_exp_elt_opcode (OP_THIS);
-			      write_exp_elt_opcode (STRUCTOP_PTR);
-			      write_exp_string ($1.stoken);
-			      write_exp_elt_opcode (STRUCTOP_PTR);
+			      write_exp_elt_opcode (pstate, OP_THIS);
+			      write_exp_elt_opcode (pstate, OP_THIS);
+			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
+			      write_exp_string (pstate, $1.stoken);
+			      write_exp_elt_opcode (pstate, STRUCTOP_PTR);
 			      /* We need type of this.  */
-			      this_val = value_of_this_silent (parse_language);
+			      this_val
+				= value_of_this_silent (parse_language (pstate));
 			      if (this_val)
 				this_type = value_type (this_val);
 			      else
@@ -796,7 +816,7 @@ variable:	name_not_typename
 			      msymbol =
 				lookup_bound_minimal_symbol (arg);
 			      if (msymbol.minsym != NULL)
-				write_exp_msymbol (msymbol);
+				write_exp_msymbol (pstate, msymbol);
 			      else if (!have_full_symbols ()
 				       && !have_partial_symbols ())
 				error (_("No symbol table is loaded.  "
@@ -865,7 +885,8 @@ name_not_typename :	NAME
 /*** Needs some error checking for the float case ***/
 
 static int
-parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
+parse_number (struct parser_state *par_state,
+	      const char *p, int len, int parsed_float, YYSTYPE *putithere)
 {
   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
      here, and we do kind of silly things like cast to unsigned.  */
@@ -890,7 +911,7 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 
   if (parsed_float)
     {
-      if (! parse_c_float (parse_gdbarch, p, len,
+      if (! parse_c_float (parse_gdbarch (par_state), p, len,
 			   &putithere->typed_val_float.dval,
 			   &putithere->typed_val_float.type))
 	return ERROR;
@@ -996,9 +1017,10 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 
   un = (ULONGEST)n >> 2;
   if (long_p == 0
-      && (un >> (gdbarch_int_bit (parse_gdbarch) - 2)) == 0)
+      && (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch) - 1);
+      high_bit
+	= ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
 
       /* A large decimal (not hex or octal) constant (between INT_MAX
 	 and UINT_MAX) is a long or unsigned long, according to ANSI,
@@ -1006,28 +1028,29 @@ parse_number (const char *p, int len, int parsed_float, YYSTYPE *putithere)
 	 int.  This probably should be fixed.  GCC gives a warning on
 	 such constants.  */
 
-      unsigned_type = parse_type->builtin_unsigned_int;
-      signed_type = parse_type->builtin_int;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_int;
+      signed_type = parse_type (par_state)->builtin_int;
     }
   else if (long_p <= 1
-	   && (un >> (gdbarch_long_bit (parse_gdbarch) - 2)) == 0)
+	   && (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
     {
-      high_bit = ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch) - 1);
-      unsigned_type = parse_type->builtin_unsigned_long;
-      signed_type = parse_type->builtin_long;
+      high_bit
+	= ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long;
+      signed_type = parse_type (par_state)->builtin_long;
     }
   else
     {
       int shift;
       if (sizeof (ULONGEST) * HOST_CHAR_BIT
-	  < gdbarch_long_long_bit (parse_gdbarch))
+	  < gdbarch_long_long_bit (parse_gdbarch (par_state)))
 	/* A long long does not fit in a LONGEST.  */
 	shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
       else
-	shift = (gdbarch_long_long_bit (parse_gdbarch) - 1);
+	shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
       high_bit = (ULONGEST) 1 << shift;
-      unsigned_type = parse_type->builtin_unsigned_long_long;
-      signed_type = parse_type->builtin_long_long;
+      unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
+      signed_type = parse_type (par_state)->builtin_long_long;
     }
 
    putithere->typed_val_int.val = n;
@@ -1195,12 +1218,12 @@ yylex (void)
       lexptr++;
       c = *lexptr++;
       if (c == '\\')
-	c = parse_escape (parse_gdbarch, &lexptr);
+	c = parse_escape (parse_gdbarch (pstate), &lexptr);
       else if (c == '\'')
 	error (_("Empty character constant."));
 
       yylval.typed_val_int.val = c;
-      yylval.typed_val_int.type = parse_type->builtin_char;
+      yylval.typed_val_int.type = parse_type (pstate)->builtin_char;
 
       c = *lexptr++;
       if (c != '\'')
@@ -1298,7 +1321,7 @@ yylex (void)
 				  && (*p < 'A' || *p > 'Z')))
 	      break;
 	  }
-	toktype = parse_number (tokstart,
+	toktype = parse_number (pstate, tokstart,
 				p - tokstart, got_dot | got_e, &yylval);
         if (toktype == ERROR)
 	  {
@@ -1365,7 +1388,7 @@ yylex (void)
 	    break;
 	  case '\\':
 	    ++tokptr;
-	    c = parse_escape (parse_gdbarch, &tokptr);
+	    c = parse_escape (parse_gdbarch (pstate), &tokptr);
 	    if (c == -1)
 	      {
 		continue;
@@ -1508,7 +1531,7 @@ yylex (void)
         but this conflicts with the GDB use for debugger variables
         so in expression to enter hexadecimal values
         we still need to use C syntax with 0xff  */
-      write_dollar_variable (yylval.sval);
+      write_dollar_variable (pstate, yylval.sval);
       tmp = alloca (namelen + 1);
       memcpy (tmp, tokstart, namelen);
       tmp[namelen] = '\0';
@@ -1688,8 +1711,8 @@ yylex (void)
 	  return TYPENAME;
         }
     yylval.tsym.type
-      = language_lookup_primitive_type_by_name (parse_language,
-						parse_gdbarch, tmp);
+      = language_lookup_primitive_type_by_name (parse_language (pstate),
+						parse_gdbarch (pstate), tmp);
     if (yylval.tsym.type != NULL)
       {
 	free (uptokstart);
@@ -1704,7 +1727,7 @@ yylex (void)
             || (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
       {
  	YYSTYPE newlval;	/* Its value is ignored.  */
-	hextype = parse_number (tokstart, namelen, 0, &newlval);
+	hextype = parse_number (pstate, tokstart, namelen, 0, &newlval);
 	if (hextype == INT)
 	  {
 	    yylval.ssym.sym = sym;
@@ -1722,6 +1745,21 @@ yylex (void)
   }
 }
 
+int
+pascal_parse (struct parser_state *par_state)
+{
+  int result;
+  struct cleanup *c = make_cleanup_clear_parser_state (&pstate);
+
+  /* Setting up the parser state.  */
+  gdb_assert (par_state != NULL);
+  pstate = par_state;
+
+  result = yyparse ();
+  do_cleanups (c);
+  return result;
+}
+
 void
 yyerror (char *msg)
 {
diff --git a/gdb/p-lang.h b/gdb/p-lang.h
index 1a94b8f..ea2d37c 100644
--- a/gdb/p-lang.h
+++ b/gdb/p-lang.h
@@ -20,11 +20,12 @@
 /* This file is derived from c-lang.h */
 
 struct value;
+struct parser_state;
 
 /* Defined in p-lang.c */
 extern const char *pascal_main_name (void);
 
-extern int pascal_parse (void);	/* Defined in p-exp.y */
+extern int pascal_parse (struct parser_state *); /* Defined in p-exp.y */
 
 extern void pascal_error (char *);	/* Defined in p-exp.y */
 
diff --git a/gdb/parse.c b/gdb/parse.c
index c6e25a9..b0da2ef 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -67,9 +67,6 @@ const struct exp_descriptor exp_descriptor_standard =
   };
 
 /* Global variables declared in parser-defs.h (and commented there).  */
-struct expression *expout;
-int expout_size;
-int expout_ptr;
 const struct block *expression_context_block;
 CORE_ADDR expression_context_pc;
 const struct block *innermost_block;
@@ -185,118 +182,121 @@ free_funcalls (void *ignore)
     }
 }
 
-/* This page contains the functions for adding data to the struct expression
-   being constructed.  */
 
 /* See definition in parser-defs.h.  */
 
 void
-initialize_expout (int initial_size, const struct language_defn *lang,
+initialize_expout (struct parser_state *ps, size_t initial_size,
+		   const struct language_defn *lang,
 		   struct gdbarch *gdbarch)
 {
-  expout_size = initial_size;
-  expout_ptr = 0;
-  expout = xmalloc (sizeof (struct expression)
-		    + EXP_ELEM_TO_BYTES (expout_size));
-  expout->language_defn = lang;
-  expout->gdbarch = gdbarch;
+  ps->expout_size = initial_size;
+  ps->expout_ptr = 0;
+  ps->expout = xmalloc (sizeof (struct expression)
+			+ EXP_ELEM_TO_BYTES (ps->expout_size));
+  ps->expout->language_defn = lang;
+  ps->expout->gdbarch = gdbarch;
 }
 
 /* See definition in parser-defs.h.  */
 
 void
-reallocate_expout (void)
+reallocate_expout (struct parser_state *ps)
 {
   /* Record the actual number of expression elements, and then
      reallocate the expression memory so that we free up any
      excess elements.  */
 
-  expout->nelts = expout_ptr;
-  expout = xrealloc ((char *) expout,
-		     sizeof (struct expression)
-		     + EXP_ELEM_TO_BYTES (expout_ptr));
+  ps->expout->nelts = ps->expout_ptr;
+  ps->expout = (struct expression *)
+     xrealloc (ps->expout,
+	       sizeof (struct expression)
+	       + EXP_ELEM_TO_BYTES (ps->expout_ptr));
 }
 
+/* This page contains the functions for adding data to the struct expression
+   being constructed.  */
+
 /* Add one element to the end of the expression.  */
 
 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
    a register through here.  */
 
 static void
-write_exp_elt (const union exp_element *expelt)
+write_exp_elt (struct parser_state *ps, const union exp_element *expelt)
 {
-  if (expout_ptr >= expout_size)
+  if (ps->expout_ptr >= ps->expout_size)
     {
-      expout_size *= 2;
-      expout = (struct expression *)
-	xrealloc ((char *) expout, sizeof (struct expression)
-		  + EXP_ELEM_TO_BYTES (expout_size));
+      ps->expout_size *= 2;
+      ps->expout = (struct expression *)
+	xrealloc (ps->expout, sizeof (struct expression)
+		  + EXP_ELEM_TO_BYTES (ps->expout_size));
     }
-  expout->elts[expout_ptr++] = *expelt;
+  ps->expout->elts[ps->expout_ptr++] = *expelt;
 }
 
 void
-write_exp_elt_opcode (enum exp_opcode expelt)
+write_exp_elt_opcode (struct parser_state *ps, enum exp_opcode expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.opcode = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_sym (struct symbol *expelt)
+write_exp_elt_sym (struct parser_state *ps, struct symbol *expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.symbol = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_block (const struct block *b)
+write_exp_elt_block (struct parser_state *ps, const struct block *b)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.block = b;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_objfile (struct objfile *objfile)
+write_exp_elt_objfile (struct parser_state *ps, struct objfile *objfile)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.objfile = objfile;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_longcst (LONGEST expelt)
+write_exp_elt_longcst (struct parser_state *ps, LONGEST expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.longconst = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_dblcst (DOUBLEST expelt)
+write_exp_elt_dblcst (struct parser_state *ps, DOUBLEST expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.doubleconst = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_decfloatcst (gdb_byte expelt[16])
+write_exp_elt_decfloatcst (struct parser_state *ps, gdb_byte expelt[16])
 {
   union exp_element tmp;
   int index;
@@ -304,27 +304,27 @@ write_exp_elt_decfloatcst (gdb_byte expelt[16])
   for (index = 0; index < 16; index++)
     tmp.decfloatconst[index] = expelt[index];
 
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_type (struct type *expelt)
+write_exp_elt_type (struct parser_state *ps, struct type *expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.type = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 void
-write_exp_elt_intern (struct internalvar *expelt)
+write_exp_elt_intern (struct parser_state *ps, struct internalvar *expelt)
 {
   union exp_element tmp;
 
   memset (&tmp, 0, sizeof (union exp_element));
   tmp.internalvar = expelt;
-  write_exp_elt (&tmp);
+  write_exp_elt (ps, &tmp);
 }
 
 /* Add a string constant to the end of the expression.
@@ -349,10 +349,10 @@ write_exp_elt_intern (struct internalvar *expelt)
 
 
 void
-write_exp_string (struct stoken str)
+write_exp_string (struct parser_state *ps, struct stoken str)
 {
   int len = str.length;
-  int lenelt;
+  size_t lenelt;
   char *strdata;
 
   /* Compute the number of expression elements required to hold the string
@@ -362,28 +362,19 @@ write_exp_string (struct stoken str)
 
   lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1);
 
-  /* Ensure that we have enough available expression elements to store
-     everything.  */
-
-  if ((expout_ptr + lenelt) >= expout_size)
-    {
-      expout_size = max (expout_size * 2, expout_ptr + lenelt + 10);
-      expout = (struct expression *)
-	xrealloc ((char *) expout, (sizeof (struct expression)
-				    + EXP_ELEM_TO_BYTES (expout_size)));
-    }
+  increase_expout_size (ps, lenelt);
 
   /* Write the leading length expression element (which advances the current
      expression element index), then write the string constant followed by a
      terminating null byte, and then write the trailing length expression
      element.  */
 
-  write_exp_elt_longcst ((LONGEST) len);
-  strdata = (char *) &expout->elts[expout_ptr];
+  write_exp_elt_longcst (ps, (LONGEST) len);
+  strdata = (char *) &ps->expout->elts[ps->expout_ptr];
   memcpy (strdata, str.ptr, len);
   *(strdata + len) = '\0';
-  expout_ptr += lenelt - 2;
-  write_exp_elt_longcst ((LONGEST) len);
+  ps->expout_ptr += lenelt - 2;
+  write_exp_elt_longcst (ps, (LONGEST) len);
 }
 
 /* Add a vector of string constants to the end of the expression.
@@ -400,9 +391,11 @@ write_exp_string (struct stoken str)
    long constant, followed by the contents of the string.  */
 
 void
-write_exp_string_vector (int type, struct stoken_vector *vec)
+write_exp_string_vector (struct parser_state *ps, int type,
+			 struct stoken_vector *vec)
 {
-  int i, n_slots, len;
+  int i, len;
+  size_t n_slots;
 
   /* Compute the size.  We compute the size in number of slots to
      avoid issues with string padding.  */
@@ -421,28 +414,22 @@ write_exp_string_vector (int type, struct stoken_vector *vec)
   len = EXP_ELEM_TO_BYTES (n_slots) - 1;
 
   n_slots += 4;
-  if ((expout_ptr + n_slots) >= expout_size)
-    {
-      expout_size = max (expout_size * 2, expout_ptr + n_slots + 10);
-      expout = (struct expression *)
-	xrealloc ((char *) expout, (sizeof (struct expression)
-				    + EXP_ELEM_TO_BYTES (expout_size)));
-    }
+  increase_expout_size (ps, n_slots);
 
-  write_exp_elt_opcode (OP_STRING);
-  write_exp_elt_longcst (len);
-  write_exp_elt_longcst (type);
+  write_exp_elt_opcode (ps, OP_STRING);
+  write_exp_elt_longcst (ps, len);
+  write_exp_elt_longcst (ps, type);
 
   for (i = 0; i < vec->len; ++i)
     {
-      write_exp_elt_longcst (vec->tokens[i].length);
-      memcpy (&expout->elts[expout_ptr], vec->tokens[i].ptr,
+      write_exp_elt_longcst (ps, vec->tokens[i].length);
+      memcpy (&ps->expout->elts[ps->expout_ptr], vec->tokens[i].ptr,
 	      vec->tokens[i].length);
-      expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length);
+      ps->expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length);
     }
 
-  write_exp_elt_longcst (len);
-  write_exp_elt_opcode (OP_STRING);
+  write_exp_elt_longcst (ps, len);
+  write_exp_elt_opcode (ps, OP_STRING);
 }
 
 /* Add a bitstring constant to the end of the expression.
@@ -457,11 +444,11 @@ write_exp_string_vector (int type, struct stoken_vector *vec)
    either end of the bitstring.  */
 
 void
-write_exp_bitstring (struct stoken str)
+write_exp_bitstring (struct parser_state *ps, struct stoken str)
 {
   int bits = str.length;	/* length in bits */
   int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
-  int lenelt;
+  size_t lenelt;
   char *strdata;
 
   /* Compute the number of expression elements required to hold the bitstring,
@@ -470,33 +457,25 @@ write_exp_bitstring (struct stoken str)
 
   lenelt = 2 + BYTES_TO_EXP_ELEM (len);
 
-  /* Ensure that we have enough available expression elements to store
-     everything.  */
-
-  if ((expout_ptr + lenelt) >= expout_size)
-    {
-      expout_size = max (expout_size * 2, expout_ptr + lenelt + 10);
-      expout = (struct expression *)
-	xrealloc ((char *) expout, (sizeof (struct expression)
-				    + EXP_ELEM_TO_BYTES (expout_size)));
-    }
+  increase_expout_size (ps, lenelt);
 
   /* Write the leading length expression element (which advances the current
      expression element index), then write the bitstring constant, and then
      write the trailing length expression element.  */
 
-  write_exp_elt_longcst ((LONGEST) bits);
-  strdata = (char *) &expout->elts[expout_ptr];
+  write_exp_elt_longcst (ps, (LONGEST) bits);
+  strdata = (char *) &ps->expout->elts[ps->expout_ptr];
   memcpy (strdata, str.ptr, len);
-  expout_ptr += lenelt - 2;
-  write_exp_elt_longcst ((LONGEST) bits);
+  ps->expout_ptr += lenelt - 2;
+  write_exp_elt_longcst (ps, (LONGEST) bits);
 }
 
 /* Add the appropriate elements for a minimal symbol to the end of
    the expression.  */
 
 void
-write_exp_msymbol (struct bound_minimal_symbol bound_msym)
+write_exp_msymbol (struct parser_state *ps,
+		   struct bound_minimal_symbol bound_msym)
 {
   struct minimal_symbol *msymbol = bound_msym.minsym;
   struct objfile *objfile = bound_msym.objfile;
@@ -536,62 +515,62 @@ write_exp_msymbol (struct bound_minimal_symbol bound_msym)
   if (overlay_debugging)
     addr = symbol_overlayed_address (addr, section);
 
-  write_exp_elt_opcode (OP_LONG);
+  write_exp_elt_opcode (ps, OP_LONG);
   /* Let's make the type big enough to hold a 64-bit address.  */
-  write_exp_elt_type (objfile_type (objfile)->builtin_core_addr);
-  write_exp_elt_longcst ((LONGEST) addr);
-  write_exp_elt_opcode (OP_LONG);
+  write_exp_elt_type (ps, objfile_type (objfile)->builtin_core_addr);
+  write_exp_elt_longcst (ps, (LONGEST) addr);
+  write_exp_elt_opcode (ps, OP_LONG);
 
   if (section && section->the_bfd_section->flags & SEC_THREAD_LOCAL)
     {
-      write_exp_elt_opcode (UNOP_MEMVAL_TLS);
-      write_exp_elt_objfile (objfile);
-      write_exp_elt_type (objfile_type (objfile)->nodebug_tls_symbol);
-      write_exp_elt_opcode (UNOP_MEMVAL_TLS);
+      write_exp_elt_opcode (ps, UNOP_MEMVAL_TLS);
+      write_exp_elt_objfile (ps, objfile);
+      write_exp_elt_type (ps, objfile_type (objfile)->nodebug_tls_symbol);
+      write_exp_elt_opcode (ps, UNOP_MEMVAL_TLS);
       return;
     }
 
-  write_exp_elt_opcode (UNOP_MEMVAL);
+  write_exp_elt_opcode (ps, UNOP_MEMVAL);
   switch (type)
     {
     case mst_text:
     case mst_file_text:
     case mst_solib_trampoline:
-      write_exp_elt_type (objfile_type (objfile)->nodebug_text_symbol);
+      write_exp_elt_type (ps, objfile_type (objfile)->nodebug_text_symbol);
       break;
 
     case mst_text_gnu_ifunc:
-      write_exp_elt_type (objfile_type (objfile)
-					       ->nodebug_text_gnu_ifunc_symbol);
+      write_exp_elt_type (ps, objfile_type (objfile)
+			  ->nodebug_text_gnu_ifunc_symbol);
       break;
 
     case mst_data:
     case mst_file_data:
     case mst_bss:
     case mst_file_bss:
-      write_exp_elt_type (objfile_type (objfile)->nodebug_data_symbol);
+      write_exp_elt_type (ps, objfile_type (objfile)->nodebug_data_symbol);
       break;
 
     case mst_slot_got_plt:
-      write_exp_elt_type (objfile_type (objfile)->nodebug_got_plt_symbol);
+      write_exp_elt_type (ps, objfile_type (objfile)->nodebug_got_plt_symbol);
       break;
 
     default:
-      write_exp_elt_type (objfile_type (objfile)->nodebug_unknown_symbol);
+      write_exp_elt_type (ps, objfile_type (objfile)->nodebug_unknown_symbol);
       break;
     }
-  write_exp_elt_opcode (UNOP_MEMVAL);
+  write_exp_elt_opcode (ps, UNOP_MEMVAL);
 }
 
 /* Mark the current index as the starting location of a structure
    expression.  This is used when completing on field names.  */
 
 void
-mark_struct_expression (void)
+mark_struct_expression (struct parser_state *ps)
 {
   gdb_assert (parse_completion
 	      && expout_tag_completion_type == TYPE_CODE_UNDEF);
-  expout_last_struct = expout_ptr;
+  expout_last_struct = ps->expout_ptr;
 }
 
 /* Indicate that the current parser invocation is completing a tag.
@@ -638,7 +617,7 @@ mark_completion_tag (enum type_code tag, const char *ptr, int length)
    value in the value history, I.e. $$1  */
 
 void
-write_dollar_variable (struct stoken str)
+write_dollar_variable (struct parser_state *ps, struct stoken str)
 {
   struct symbol *sym = NULL;
   struct bound_minimal_symbol msym;
@@ -676,7 +655,7 @@ write_dollar_variable (struct stoken str)
 
   /* Handle tokens that refer to machine registers:
      $ followed by a register name.  */
-  i = user_reg_map_name_to_regnum (parse_gdbarch,
+  i = user_reg_map_name_to_regnum (parse_gdbarch (ps),
 				   str.ptr + 1, str.length - 1);
   if (i >= 0)
     goto handle_register;
@@ -686,9 +665,9 @@ write_dollar_variable (struct stoken str)
   isym = lookup_only_internalvar (copy_name (str) + 1);
   if (isym)
     {
-      write_exp_elt_opcode (OP_INTERNALVAR);
-      write_exp_elt_intern (isym);
-      write_exp_elt_opcode (OP_INTERNALVAR);
+      write_exp_elt_opcode (ps, OP_INTERNALVAR);
+      write_exp_elt_intern (ps, isym);
+      write_exp_elt_opcode (ps, OP_INTERNALVAR);
       return;
     }
 
@@ -699,36 +678,36 @@ write_dollar_variable (struct stoken str)
 		       VAR_DOMAIN, NULL);
   if (sym)
     {
-      write_exp_elt_opcode (OP_VAR_VALUE);
-      write_exp_elt_block (block_found);	/* set by lookup_symbol */
-      write_exp_elt_sym (sym);
-      write_exp_elt_opcode (OP_VAR_VALUE);
+      write_exp_elt_opcode (ps, OP_VAR_VALUE);
+      write_exp_elt_block (ps, block_found);	/* set by lookup_symbol */
+      write_exp_elt_sym (ps, sym);
+      write_exp_elt_opcode (ps, OP_VAR_VALUE);
       return;
     }
   msym = lookup_bound_minimal_symbol (copy_name (str));
   if (msym.minsym)
     {
-      write_exp_msymbol (msym);
+      write_exp_msymbol (ps, msym);
       return;
     }
 
   /* Any other names are assumed to be debugger internal variables.  */
 
-  write_exp_elt_opcode (OP_INTERNALVAR);
-  write_exp_elt_intern (create_internalvar (copy_name (str) + 1));
-  write_exp_elt_opcode (OP_INTERNALVAR);
+  write_exp_elt_opcode (ps, OP_INTERNALVAR);
+  write_exp_elt_intern (ps, create_internalvar (copy_name (str) + 1));
+  write_exp_elt_opcode (ps, OP_INTERNALVAR);
   return;
 handle_last:
-  write_exp_elt_opcode (OP_LAST);
-  write_exp_elt_longcst ((LONGEST) i);
-  write_exp_elt_opcode (OP_LAST);
+  write_exp_elt_opcode (ps, OP_LAST);
+  write_exp_elt_longcst (ps, (LONGEST) i);
+  write_exp_elt_opcode (ps, OP_LAST);
   return;
 handle_register:
-  write_exp_elt_opcode (OP_REGISTER);
+  write_exp_elt_opcode (ps, OP_REGISTER);
   str.length--;
   str.ptr++;
-  write_exp_string (str);
-  write_exp_elt_opcode (OP_REGISTER);
+  write_exp_string (ps, str);
+  write_exp_elt_opcode (ps, OP_REGISTER);
   return;
 }
 
@@ -1161,6 +1140,7 @@ parse_exp_in_context_1 (const char **stringptr, CORE_ADDR pc,
   volatile struct gdb_exception except;
   struct cleanup *old_chain, *inner_chain;
   const struct language_defn *lang = NULL;
+  struct parser_state ps;
   int subexp;
 
   lexptr = *stringptr;
@@ -1233,47 +1213,48 @@ parse_exp_in_context_1 (const char **stringptr, CORE_ADDR pc,
      While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
      and others called from *.y) ensure CURRENT_LANGUAGE gets restored
      to the value matching SELECTED_FRAME as set by get_current_arch.  */
-  initialize_expout (10, lang, get_current_arch ());
+
+  initialize_expout (&ps, 10, lang, get_current_arch ());
   inner_chain = make_cleanup_restore_current_language ();
   set_language (lang->la_language);
 
   TRY_CATCH (except, RETURN_MASK_ALL)
     {
-      if (lang->la_parser ())
+      if (lang->la_parser (&ps))
         lang->la_error (NULL);
     }
   if (except.reason < 0)
     {
       if (! parse_completion)
 	{
-	  xfree (expout);
+	  xfree (ps.expout);
 	  throw_exception (except);
 	}
     }
 
-  reallocate_expout ();
+  reallocate_expout (&ps);
 
   /* Convert expression from postfix form as generated by yacc
      parser, to a prefix form.  */
 
   if (expressiondebug)
-    dump_raw_expression (expout, gdb_stdlog,
+    dump_raw_expression (ps.expout, gdb_stdlog,
 			 "before conversion to prefix form");
 
-  subexp = prefixify_expression (expout);
+  subexp = prefixify_expression (ps.expout);
   if (out_subexp)
     *out_subexp = subexp;
 
-  lang->la_post_parser (&expout, void_context_p);
+  lang->la_post_parser (&ps.expout, void_context_p);
 
   if (expressiondebug)
-    dump_prefix_expression (expout, gdb_stdlog);
+    dump_prefix_expression (ps.expout, gdb_stdlog);
 
   do_cleanups (inner_chain);
   discard_cleanups (old_chain);
 
   *stringptr = lexptr;
-  return expout;
+  return ps.expout;
 }
 
 /* Parse STRING as an expression, and complain if this fails
@@ -1512,7 +1493,7 @@ push_type_int (int n)
    item.  */
 
 void
-insert_type_address_space (char *string)
+insert_type_address_space (struct parser_state *pstate, char *string)
 {
   union type_stack_elt element;
   int slot;
@@ -1527,7 +1508,8 @@ insert_type_address_space (char *string)
 
   element.piece = tp_space_identifier;
   insert_into_type_stack (slot, element);
-  element.int_val = address_space_name_to_int (parse_gdbarch, string);
+  element.int_val = address_space_name_to_int (parse_gdbarch (pstate),
+					       string);
   insert_into_type_stack (slot, element);
 }
 
@@ -1909,6 +1891,21 @@ exp_uses_objfile (struct expression *exp, struct objfile *objfile)
   return exp_iterate (exp, exp_uses_objfile_iter, objfile);
 }
 
+/* See definition in parser-defs.h.  */
+
+void
+increase_expout_size (struct parser_state *ps, size_t lenelt)
+{
+  if ((ps->expout_ptr + lenelt) >= ps->expout_size)
+    {
+      ps->expout_size = max (ps->expout_size * 2,
+			     ps->expout_ptr + lenelt + 10);
+      ps->expout = (struct expression *)
+	xrealloc (ps->expout, (sizeof (struct expression)
+			       + EXP_ELEM_TO_BYTES (ps->expout_size)));
+    }
+}
+
 void
 _initialize_parse (void)
 {
diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h
index c3f2607..97c53b9 100644
--- a/gdb/parser-defs.h
+++ b/gdb/parser-defs.h
@@ -28,15 +28,29 @@
 #include "expression.h"
 
 struct block;
+struct language_defn;
+struct internalvar;
 
 extern int parser_debug;
 
-extern struct expression *expout;
-extern int expout_size;
-extern int expout_ptr;
+#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
+#define parse_language(ps) ((ps)->expout->language_defn)
 
-#define parse_gdbarch (expout->gdbarch)
-#define parse_language (expout->language_defn)
+struct parser_state
+{
+  /* The expression related to this parser state.  */
+
+  struct expression *expout;
+
+  /* The size of the expression above.  */
+
+  size_t expout_size;
+
+  /* The number of elements already in the expression.  This is used
+     to know where to put new elements.  */
+
+  size_t expout_ptr;
+};
 
 /* If this is nonzero, this block is used as the lexical context
    for symbol names.  */
@@ -148,19 +162,21 @@ struct type_stack
 };
 
 /* Helper function to initialize the expout, expout_size, expout_ptr
-   trio before it is used to store expression elements created during
-   the parsing of an expression.  INITIAL_SIZE is the initial size of
+   trio inside PS before it is used to store expression elements created
+   during the parsing of an expression.  INITIAL_SIZE is the initial size of
    the expout array.  LANG is the language used to parse the expression.
    And GDBARCH is the gdbarch to use during parsing.  */
 
-extern void initialize_expout (int, const struct language_defn *,
-			       struct gdbarch *);
+extern void initialize_expout (struct parser_state *ps,
+			       size_t initial_size,
+			       const struct language_defn *lang,
+			       struct gdbarch *gdbarch);
 
-/* Helper function that frees any unsed space in the expout array.
-   It is generally used when the parser has just been parsed and
-   created.  */
+/* Helper function that reallocates the EXPOUT inside PS in order to
+   eliminate any unused space.  It is generally used when the expression
+   has just been parsed and created.  */
 
-extern void reallocate_expout (void);
+extern void reallocate_expout (struct parser_state *ps);
 
 /* Reverse an expression from suffix form (in which it is constructed)
    to prefix form (in which we can conveniently print or execute it).
@@ -171,35 +187,38 @@ extern void reallocate_expout (void);
 
 extern int prefixify_expression (struct expression *expr);
 
-extern void write_exp_elt_opcode (enum exp_opcode);
+extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
 
-extern void write_exp_elt_sym (struct symbol *);
+extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
 
-extern void write_exp_elt_longcst (LONGEST);
+extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
 
-extern void write_exp_elt_dblcst (DOUBLEST);
+extern void write_exp_elt_dblcst (struct parser_state *, DOUBLEST);
 
-extern void write_exp_elt_decfloatcst (gdb_byte *);
+extern void write_exp_elt_decfloatcst (struct parser_state *, gdb_byte *);
 
-extern void write_exp_elt_type (struct type *);
+extern void write_exp_elt_type (struct parser_state *, struct type *);
 
-extern void write_exp_elt_intern (struct internalvar *);
+extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
 
-extern void write_exp_string (struct stoken);
+extern void write_exp_string (struct parser_state *, struct stoken);
 
-void write_exp_string_vector (int type, struct stoken_vector *vec);
+void write_exp_string_vector (struct parser_state *, int type,
+			      struct stoken_vector *vec);
 
-extern void write_exp_bitstring (struct stoken);
+extern void write_exp_bitstring (struct parser_state *, struct stoken);
 
-extern void write_exp_elt_block (const struct block *);
+extern void write_exp_elt_block (struct parser_state *, const struct block *);
 
-extern void write_exp_elt_objfile (struct objfile *objfile);
+extern void write_exp_elt_objfile (struct parser_state *,
+				   struct objfile *objfile);
 
-extern void write_exp_msymbol (struct bound_minimal_symbol);
+extern void write_exp_msymbol (struct parser_state *,
+			       struct bound_minimal_symbol);
 
-extern void write_dollar_variable (struct stoken str);
+extern void write_dollar_variable (struct parser_state *, struct stoken str);
 
-extern void mark_struct_expression (void);
+extern void mark_struct_expression (struct parser_state *);
 
 extern const char *find_template_name_end (const char *);
 
@@ -215,7 +234,7 @@ extern void push_type (enum type_pieces);
 
 extern void push_type_int (int);
 
-extern void insert_type_address_space (char *);
+extern void insert_type_address_space (struct parser_state *, char *);
 
 extern enum type_pieces pop_type (void);
 
@@ -375,5 +394,11 @@ extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
 extern void mark_completion_tag (enum type_code, const char *ptr,
 				 int length);
 
+/* Reallocate the `expout' pointer inside PS so that it can accommodate
+   at least LENELT expression elements.  This function does nothing if
+   there is enough room for the elements.  */
+
+extern void increase_expout_size (struct parser_state *ps, size_t lenelt);
+
 #endif /* PARSER_DEFS_H */
 
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 08c5342..5278a24 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -978,11 +978,11 @@ ppc_stap_parse_special_token (struct gdbarch *gdbarch,
 	error (_("Invalid register name `%s' on expression `%s'."),
 	       regname, p->saved_arg);
 
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
       str.ptr = regname;
       str.length = len;
-      write_exp_string (str);
-      write_exp_elt_opcode (OP_REGISTER);
+      write_exp_string (&p->pstate, str);
+      write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
       p->arg = s;
     }
diff --git a/gdb/stap-probe.c b/gdb/stap-probe.c
index 986debd..dbe9f31 100644
--- a/gdb/stap-probe.c
+++ b/gdb/stap-probe.c
@@ -601,12 +601,12 @@ stap_parse_register_operand (struct stap_parse_info *p)
       p->arg = endp;
 
       /* Generating the expression for the displacement.  */
-      write_exp_elt_opcode (OP_LONG);
-      write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-      write_exp_elt_longcst (displacement);
-      write_exp_elt_opcode (OP_LONG);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
+      write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
+      write_exp_elt_longcst (&p->pstate, displacement);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
       if (got_minus)
-	write_exp_elt_opcode (UNOP_NEG);
+	write_exp_elt_opcode (&p->pstate, UNOP_NEG);
     }
 
   /* Getting rid of register indirection prefix.  */
@@ -660,23 +660,23 @@ stap_parse_register_operand (struct stap_parse_info *p)
     error (_("Invalid register name `%s' on expression `%s'."),
 	   regname, p->saved_arg);
 
-  write_exp_elt_opcode (OP_REGISTER);
+  write_exp_elt_opcode (&p->pstate, OP_REGISTER);
   str.ptr = regname;
   str.length = len;
-  write_exp_string (str);
-  write_exp_elt_opcode (OP_REGISTER);
+  write_exp_string (&p->pstate, str);
+  write_exp_elt_opcode (&p->pstate, OP_REGISTER);
 
   if (indirect_p)
     {
       if (disp_p)
-	write_exp_elt_opcode (BINOP_ADD);
+	write_exp_elt_opcode (&p->pstate, BINOP_ADD);
 
       /* Casting to the expected type.  */
-      write_exp_elt_opcode (UNOP_CAST);
-      write_exp_elt_type (lookup_pointer_type (p->arg_type));
-      write_exp_elt_opcode (UNOP_CAST);
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
+      write_exp_elt_type (&p->pstate, lookup_pointer_type (p->arg_type));
+      write_exp_elt_opcode (&p->pstate, UNOP_CAST);
 
-      write_exp_elt_opcode (UNOP_IND);
+      write_exp_elt_opcode (&p->pstate, UNOP_IND);
     }
 
   /* Getting rid of the register name suffix.  */
@@ -767,9 +767,9 @@ stap_parse_single_operand (struct stap_parse_info *p)
 	  ++p->arg;
 	  stap_parse_argument_conditionally (p);
 	  if (c == '-')
-	    write_exp_elt_opcode (UNOP_NEG);
+	    write_exp_elt_opcode (&p->pstate, UNOP_NEG);
 	  else if (c == '~')
-	    write_exp_elt_opcode (UNOP_COMPLEMENT);
+	    write_exp_elt_opcode (&p->pstate, UNOP_COMPLEMENT);
 	}
       else
 	{
@@ -807,10 +807,11 @@ stap_parse_single_operand (struct stap_parse_info *p)
 	  const char *int_suffix;
 
 	  /* We are dealing with a numeric constant.  */
-	  write_exp_elt_opcode (OP_LONG);
-	  write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-	  write_exp_elt_longcst (number);
-	  write_exp_elt_opcode (OP_LONG);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
+	  write_exp_elt_type (&p->pstate,
+			      builtin_type (gdbarch)->builtin_long);
+	  write_exp_elt_longcst (&p->pstate, number);
+	  write_exp_elt_opcode (&p->pstate, OP_LONG);
 
 	  p->arg = tmp;
 
@@ -837,10 +838,10 @@ stap_parse_single_operand (struct stap_parse_info *p)
       number = strtol (p->arg, &endp, 10);
       p->arg = endp;
 
-      write_exp_elt_opcode (OP_LONG);
-      write_exp_elt_type (builtin_type (gdbarch)->builtin_long);
-      write_exp_elt_longcst (number);
-      write_exp_elt_opcode (OP_LONG);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
+      write_exp_elt_type (&p->pstate, builtin_type (gdbarch)->builtin_long);
+      write_exp_elt_longcst (&p->pstate, number);
+      write_exp_elt_opcode (&p->pstate, OP_LONG);
 
       if (stap_check_integer_suffix (gdbarch, p->arg, &int_suffix))
 	p->arg += strlen (int_suffix);
@@ -987,7 +988,7 @@ stap_parse_argument_1 (struct stap_parse_info *p, int has_lhs,
 	  stap_parse_argument_1 (p, 1, lookahead_prec);
 	}
 
-      write_exp_elt_opcode (opcode);
+      write_exp_elt_opcode (&p->pstate, opcode);
     }
 }
 
@@ -1028,8 +1029,8 @@ stap_parse_argument (const char **arg, struct type *atype,
   /* We need to initialize the expression buffer, in order to begin
      our parsing efforts.  The language here does not matter, since we
      are using our own parser.  */
-  initialize_expout (10, current_language, gdbarch);
-  back_to = make_cleanup (free_current_contents, &expout);
+  initialize_expout (&p.pstate, 10, current_language, gdbarch);
+  back_to = make_cleanup (free_current_contents, &p.pstate.expout);
 
   p.saved_arg = *arg;
   p.arg = *arg;
@@ -1044,16 +1045,17 @@ stap_parse_argument (const char **arg, struct type *atype,
   gdb_assert (p.inside_paren_p == 0);
 
   /* Casting the final expression to the appropriate type.  */
-  write_exp_elt_opcode (UNOP_CAST);
-  write_exp_elt_type (atype);
-  write_exp_elt_opcode (UNOP_CAST);
+  write_exp_elt_opcode (&p.pstate, UNOP_CAST);
+  write_exp_elt_type (&p.pstate, atype);
+  write_exp_elt_opcode (&p.pstate, UNOP_CAST);
 
-  reallocate_expout ();
+  reallocate_expout (&p.pstate);
 
   p.arg = skip_spaces_const (p.arg);
   *arg = p.arg;
 
-  return expout;
+  /* We can safely return EXPOUT here.  */
+  return p.pstate.expout;
 }
 
 /* Function which parses an argument string from PROBE, correctly splitting
diff --git a/gdb/stap-probe.h b/gdb/stap-probe.h
index 5b16201..6d3c12e 100644
--- a/gdb/stap-probe.h
+++ b/gdb/stap-probe.h
@@ -20,6 +20,9 @@
 #if !defined (STAP_PROBE_H)
 #define STAP_PROBE_H 1
 
+/* For `struct parser_state'.  */
+#include "parser-defs.h"
+
 /* Structure which holds information about the parsing process of one probe's
    argument.  */
 
@@ -28,6 +31,9 @@ struct stap_parse_info
   /* The probe's argument in a string format.  */
   const char *arg;
 
+  /* The parser state to be used when generating the expression.  */
+  struct parser_state pstate;
+
   /* A pointer to the full chain of arguments.  This is useful for printing
      error messages.  The parser functions should not modify this argument
      directly; instead, they should use the ARG pointer above.  */
diff --git a/gdb/utils.c b/gdb/utils.c
index 364470c..a8a7cb3 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -466,6 +466,24 @@ make_cleanup_restore_current_language (void)
 		       (void *) (uintptr_t) saved_lang);
 }
 
+/* Helper function for make_cleanup_clear_parser_state.  */
+
+static void
+do_clear_parser_state (void *ptr)
+{
+  struct parser_state **p = (struct parser_state **) ptr;
+
+  *p = NULL;
+}
+
+/* Clean (i.e., set to NULL) the parser state variable P.  */
+
+struct cleanup *
+make_cleanup_clear_parser_state (struct parser_state **p)
+{
+  return make_cleanup (do_clear_parser_state, (void *) p);
+}
+
 /* This function is useful for cleanups.
    Do
 
diff --git a/gdb/utils.h b/gdb/utils.h
index d6df2ee..33371ac 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -115,6 +115,10 @@ extern struct cleanup *make_cleanup_restore_current_language (void);
 
 extern struct cleanup *make_cleanup_htab_delete (htab_t htab);
 
+struct parser_state;
+extern struct cleanup *make_cleanup_clear_parser_state
+  (struct parser_state **p);
+
 extern void free_current_contents (void *);
 
 extern void init_page_info (void);