Make base class for parser_state

This makes a new base class, expr_builder, for parser_state.  This
separates the state needed to construct an expression from the state
needed by the parsers.

gdb/ChangeLog
2019-04-04  Tom Tromey  <tom@tromey.com>

	* gdbarch.h, gdbarch.c: Rebuild.
	* gdbarch.sh (dtrace_parse_probe_argument): Change type.
	* stap-probe.h:
	(struct stap_parse_info): Replace "parser_state" with
	"expr_builder".
	* parser-defs.h (struct expr_builder): Rename from "parser_state".
	(parser_state): New class.
	* parse.c (expr_builder): Rename.
	(expr_builder::release): Rename.
	(write_exp_elt, write_exp_elt_opcode, write_exp_elt_sym)
	(write_exp_elt_msym, write_exp_elt_block, write_exp_elt_objfile)
	(write_exp_elt_longcst, write_exp_elt_floatcst)
	(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)
	(insert_type_address_space, increase_expout_size): Replace
	"parser_state" with "expr_builder".
	* dtrace-probe.c: Replace "parser_state" with "expr_builder".
	* amd64-linux-tdep.c (amd64_dtrace_parse_probe_argument): Replace
	"parser_state" with "expr_builder".

1 files changed, 38 insertions, 18 deletions

diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h
index 8fcbca3..5bc9d25 100644
--- a/gdb/parser-defs.h
+++ b/gdb/parser-defs.h
@@ -32,15 +32,17 @@ struct internalvar;
 
 extern int parser_debug;
 
-struct parser_state
+/* A class that can be used to build a "struct expression".  */
+
+struct expr_builder
 {
   /* Constructor.  LANG is the language used to parse the expression.
      And GDBARCH is the gdbarch to use during parsing.  */
 
-  parser_state (const struct language_defn *lang,
+  expr_builder (const struct language_defn *lang,
 		struct gdbarch *gdbarch);
 
-  DISABLE_COPY_AND_ASSIGN (parser_state);
+  DISABLE_COPY_AND_ASSIGN (expr_builder);
 
   /* Resize the allocated expression to the correct size, and return
      it as an expression_up -- passing ownership to the caller.  */
@@ -74,6 +76,24 @@ struct parser_state
   size_t expout_ptr;
 };
 
+/* An instance of this type is instantiated during expression parsing,
+   and passed to the appropriate parser.  It holds both inputs to the
+   parser, and result.  */
+
+struct parser_state : public expr_builder
+{
+  /* Constructor.  LANG is the language used to parse the expression.
+     And GDBARCH is the gdbarch to use during parsing.  */
+
+  parser_state (const struct language_defn *lang,
+		struct gdbarch *gdbarch)
+    : expr_builder (lang, gdbarch)
+  {
+  }
+
+  DISABLE_COPY_AND_ASSIGN (parser_state);
+};
+
 /* If this is nonzero, this block is used as the lexical context
    for symbol names.  */
 
@@ -236,36 +256,36 @@ struct type_stack
 
 extern int prefixify_expression (struct expression *expr);
 
-extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);
+extern void write_exp_elt_opcode (struct expr_builder *, enum exp_opcode);
 
-extern void write_exp_elt_sym (struct parser_state *, struct symbol *);
+extern void write_exp_elt_sym (struct expr_builder *, struct symbol *);
 
-extern void write_exp_elt_longcst (struct parser_state *, LONGEST);
+extern void write_exp_elt_longcst (struct expr_builder *, LONGEST);
 
-extern void write_exp_elt_floatcst (struct parser_state *, const gdb_byte *);
+extern void write_exp_elt_floatcst (struct expr_builder *, const gdb_byte *);
 
-extern void write_exp_elt_type (struct parser_state *, struct type *);
+extern void write_exp_elt_type (struct expr_builder *, struct type *);
 
-extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);
+extern void write_exp_elt_intern (struct expr_builder *, struct internalvar *);
 
-extern void write_exp_string (struct parser_state *, struct stoken);
+extern void write_exp_string (struct expr_builder *, struct stoken);
 
-void write_exp_string_vector (struct parser_state *, int type,
+void write_exp_string_vector (struct expr_builder *, int type,
 			      struct stoken_vector *vec);
 
-extern void write_exp_bitstring (struct parser_state *, struct stoken);
+extern void write_exp_bitstring (struct expr_builder *, struct stoken);
 
-extern void write_exp_elt_block (struct parser_state *, const struct block *);
+extern void write_exp_elt_block (struct expr_builder *, const struct block *);
 
-extern void write_exp_elt_objfile (struct parser_state *,
+extern void write_exp_elt_objfile (struct expr_builder *,
 				   struct objfile *objfile);
 
-extern void write_exp_msymbol (struct parser_state *,
+extern void write_exp_msymbol (struct expr_builder *,
 			       struct bound_minimal_symbol);
 
-extern void write_dollar_variable (struct parser_state *, struct stoken str);
+extern void write_dollar_variable (struct expr_builder *, struct stoken str);
 
-extern void mark_struct_expression (struct parser_state *);
+extern void mark_struct_expression (struct expr_builder *);
 
 extern const char *find_template_name_end (const char *);
 
@@ -281,7 +301,7 @@ extern void push_type (enum type_pieces);
 
 extern void push_type_int (int);
 
-extern void insert_type_address_space (struct parser_state *, char *);
+extern void insert_type_address_space (struct expr_builder *, char *);
 
 extern enum type_pieces pop_type (void);