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From-SVN: r181

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diff --git a/gcc/tree.h b/gcc/tree.h
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+/* Front-end tree definitions for GNU compiler.
+   Copyright (C) 1989 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "machmode.h"
+
+/* codes of tree nodes */
+
+#define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
+
+enum tree_code {
+#include "tree.def"
+
+  LAST_AND_UNUSED_TREE_CODE	/* A convienent way to get a value for
+				   NUM_TREE_CODE.  */
+};
+
+#undef DEFTREECODE
+
+/* Number of tree codes.  */
+#define NUM_TREE_CODES ((int)LAST_AND_UNUSED_TREE_CODE)
+
+/* Indexed by enum tree_code, contains a character which is
+   `<' for a comparison expression, `1', for a unary arithmetic
+   expression, `2' for a binary arithmetic expression, `e' for
+   other types of expressions, `r' for a reference, `c' for a
+   constant, `d' for a decl, `t' for a type, `s' for a statement,
+   and `x' for anything else (TREE_LIST, IDENTIFIER, etc).  */
+
+extern char **tree_code_type;
+#define TREE_CODE_CLASS(CODE)	(*tree_code_type[(int) (CODE)])
+
+/* Number of argument-words in each kind of tree-node.  */
+
+extern int *tree_code_length;
+
+/* Names of tree components.  */
+
+extern char **tree_code_name;
+
+/* Codes that identify the various built in functions
+   so that expand_call can identify them quickly.  */
+
+enum built_in_function
+{
+  NOT_BUILT_IN,
+  BUILT_IN_ALLOCA,
+  BUILT_IN_ABS,
+  BUILT_IN_FABS,
+  BUILT_IN_LABS,
+  BUILT_IN_FFS,
+  BUILT_IN_DIV,
+  BUILT_IN_LDIV,
+  BUILT_IN_FFLOOR,
+  BUILT_IN_FCEIL,
+  BUILT_IN_FMOD,
+  BUILT_IN_FREM,
+  BUILT_IN_MEMCPY,
+  BUILT_IN_MEMCMP,
+  BUILT_IN_MEMSET,
+  BUILT_IN_STRCPY,
+  BUILT_IN_STRCMP,
+  BUILT_IN_STRLEN,
+  BUILT_IN_FSQRT,
+  BUILT_IN_GETEXP,
+  BUILT_IN_GETMAN,
+  BUILT_IN_SAVEREGS,
+  BUILT_IN_CLASSIFY_TYPE,
+  BUILT_IN_NEXT_ARG,
+  BUILT_IN_ARGS_INFO,
+  BUILT_IN_CONSTANT_P,
+  BUILT_IN_FRAME_ADDRESS,
+  BUILT_IN_RETURN_ADDRESS,
+  BUILT_IN_CALLER_RETURN_ADDRESS,
+
+  /* C++ extensions */
+  BUILT_IN_NEW,
+  BUILT_IN_VEC_NEW,
+  BUILT_IN_DELETE,
+  BUILT_IN_VEC_DELETE
+};
+
+/* The definition of tree nodes fills the next several pages.  */
+
+/* A tree node can represent a data type, a variable, an expression
+   or a statement.  Each node has a TREE_CODE which says what kind of
+   thing it represents.  Some common codes are:
+   INTEGER_TYPE -- represents a type of integers.
+   ARRAY_TYPE -- represents a type of pointer.
+   VAR_DECL -- represents a declared variable.
+   INTEGER_CST -- represents a constant integer value.
+   PLUS_EXPR -- represents a sum (an expression).
+
+   As for the contents of a tree node: there are some fields
+   that all nodes share.  Each TREE_CODE has various special-purpose
+   fields as well.  The fields of a node are never accessed directly,
+   always through accessor macros.  */
+
+/* This type is used everywhere to refer to a tree node.  */
+
+typedef union tree_node *tree;
+
+#define NULL_TREE (tree) NULL
+
+/* Every kind of tree node starts with this structure,
+   so all nodes have these fields.
+
+   See the accessor macros, defined below, for documentation of the fields.  */
+
+struct tree_common
+{
+  union tree_node *chain;
+  union tree_node *type;
+#ifdef ONLY_INT_FIELDS
+  unsigned int code : 8;
+#else
+  enum tree_code code : 8;
+#endif
+
+  unsigned side_effects_flag : 1;
+  unsigned constant_flag : 1;
+  unsigned permanent_flag : 1;
+  unsigned addressable_flag : 1;
+  unsigned volatile_flag : 1;
+  unsigned readonly_flag : 1;
+  unsigned unsigned_flag : 1;
+  unsigned asm_written_flag: 1;
+
+  unsigned used_flag : 1;
+  unsigned raises_flag : 1;
+  unsigned static_flag : 1;
+  unsigned public_flag : 1;
+  unsigned private_flag : 1;
+  unsigned protected_flag : 1;
+
+  unsigned lang_flag_0 : 1;
+  unsigned lang_flag_1 : 1;
+  unsigned lang_flag_2 : 1;
+  unsigned lang_flag_3 : 1;
+  unsigned lang_flag_4 : 1;
+  unsigned lang_flag_5 : 1;
+  unsigned lang_flag_6 : 1;
+  /* There is room for two more flags.  */
+};
+
+/* Define accessors for the fields that all tree nodes have
+   (though some fields are not used for all kinds of nodes).  */
+
+/* The tree-code says what kind of node it is.
+   Codes are defined in tree.def.  */
+#define TREE_CODE(NODE) ((enum tree_code) (NODE)->common.code)
+#define TREE_SET_CODE(NODE, VALUE) ((NODE)->common.code = (int) (VALUE))
+
+/* In all nodes that are expressions, this is the data type of the expression.
+   In POINTER_TYPE nodes, this is the type that the pointer points to.
+   In ARRAY_TYPE nodes, this is the type of the elements.  */
+#define TREE_TYPE(NODE) ((NODE)->common.type)
+
+/* Nodes are chained together for many purposes.
+   Types are chained together to record them for being output to the debugger
+   (see the function `chain_type').
+   Decls in the same scope are chained together to record the contents
+   of the scope.
+   Statement nodes for successive statements used to be chained together.
+   Often lists of things are represented by TREE_LIST nodes that
+   are chained together.  */
+
+#define TREE_CHAIN(NODE) ((NODE)->common.chain)
+
+/* Given an expression as a tree, strip any NON_LVALUE_EXPRs and NOP_EXPRs
+   that don't change the machine mode.  */
+
+#define STRIP_NOPS(EXP) \
+  while ((TREE_CODE (EXP) == NOP_EXPR				\
+	  || TREE_CODE (EXP) == CONVERT_EXPR			\
+	  || TREE_CODE (EXP) == NON_LVALUE_EXPR)		\
+	 && (TYPE_MODE (TREE_TYPE (EXP))			\
+	     == TYPE_MODE (TREE_TYPE (TREE_OPERAND (EXP, 0)))))	\
+    (EXP) = TREE_OPERAND (EXP, 0);
+
+/* Define many boolean fields that all tree nodes have.  */
+
+/* In VAR_DECL nodes, nonzero means address of this is needed.
+   So it cannot be in a register.
+   In a FUNCTION_DECL, nonzero means its address is needed.
+   So it must be compiled even if it is an inline function.
+   In CONSTRUCTOR nodes, it means object constructed must be in memory.
+   In LABEL_DECL nodes, it means a goto for this label has been seen 
+   from a place outside all binding contours that restore stack levels.
+   In ..._TYPE nodes, it means that objects of this type must
+   be fully addressable.  This means that pieces of this
+   object cannot go into register parameters, for example.
+   In IDENTIFIER_NODEs, this means that some extern decl for this name
+   had its address taken.  That matters for inline functions.  */
+#define TREE_ADDRESSABLE(NODE) ((NODE)->common.addressable_flag)
+
+/* In a VAR_DECL, nonzero means allocate static storage.
+   In a FUNCTION_DECL, currently nonzero if function has been defined.
+   In a CONSTRUCTOR, nonzero means allocate static storage.  */
+#define TREE_STATIC(NODE) ((NODE)->common.static_flag)
+
+/* In a CONVERT_EXPR or NOP_EXPR, this means the node was made
+   implicitly and should not lead to an "unused value" warning.  */
+#define TREE_NO_UNUSED_WARNING(NODE) ((NODE)->common.static_flag)
+
+/* Nonzero for a TREE_LIST or TREE_VEC node means that the derivation
+   chain is via a `virtual' declaration.  */
+#define TREE_VIA_VIRTUAL(NODE) ((NODE)->common.static_flag)
+
+/* In a VAR_DECL or FUNCTION_DECL,
+   nonzero means name is to be accessible from outside this module.
+   In an identifier node, nonzero means a external declaration
+   accesible from outside this module was previously seen
+   for this name in an inner scope.  */
+#define TREE_PUBLIC(NODE) ((NODE)->common.public_flag)
+
+/* Nonzero for TREE_LIST or TREE_VEC node means that the path to the
+   base class is via a `public' declaration, which preserves public
+   fields from the base class as public.  */
+#define TREE_VIA_PUBLIC(NODE) ((NODE)->common.public_flag)
+
+/* In any expression, nonzero means it has side effects or reevaluation
+   of the whole expression could produce a different value.
+   This is set if any subexpression is a function call, a side effect
+   or a reference to a volatile variable.
+   In a ..._DECL, this is set only if the declaration said `volatile'.  */
+#define TREE_SIDE_EFFECTS(NODE) ((NODE)->common.side_effects_flag)
+
+/* Nonzero means this expression is volatile in the C sense:
+   its address should be of type `volatile WHATEVER *'.
+   In other words, the declared item is volatile qualified.
+   This is used in _DECL nodes and _REF nodes.
+
+   In a ..._TYPE node, means this type is volatile-qualified.
+   But use TYPE_VOLATILE instead of this macro when the node is a type,
+   because eventually we may make that a different bit.
+
+   If this bit is set in an expression, so is TREE_SIDE_EFFECTS.  */
+#define TREE_THIS_VOLATILE(NODE) ((NODE)->common.volatile_flag)
+
+/* In a VAR_DECL, PARM_DECL or FIELD_DECL, or any kind of ..._REF node,
+   nonzero means it may not be the lhs of an assignment.
+   In a ..._TYPE node, means this type is const-qualified
+   (but the macro TYPE_READONLY should be used instead of this macro
+   when the node is a type).  */
+#define TREE_READONLY(NODE) ((NODE)->common.readonly_flag)
+
+/* Value of expression is constant.
+   Always appears in all ..._CST nodes.
+   May also appear in an arithmetic expression, an ADDR_EXPR or a CONSTRUCTOR
+   if the value is constant.  */
+#define TREE_CONSTANT(NODE) ((NODE)->common.constant_flag)
+
+/* Nonzero means permanent node;
+   node will continue to exist for the entire compiler run.
+   Otherwise it will be recycled at the end of the function.  */
+#define TREE_PERMANENT(NODE) ((NODE)->common.permanent_flag)
+
+/* In INTEGER_TYPE or ENUMERAL_TYPE nodes, means an unsigned type.
+   In FIELD_DECL nodes, means an unsigned bit field.
+   The same bit is used in functions as DECL_BUILT_IN_NONANSI.  */
+#define TREE_UNSIGNED(NODE) ((NODE)->common.unsigned_flag)
+
+/* Nonzero in a VAR_DECL means assembler code has been written.
+   Nonzero in a FUNCTION_DECL means that the function has been compiled.
+   This is interesting in an inline function, since it might not need
+   to be compiled separately.
+   Nonzero in a RECORD_TYPE, UNION_TYPE or ENUMERAL_TYPE
+   if the sdb debugging info for the type has been written.  */
+#define TREE_ASM_WRITTEN(NODE) ((NODE)->common.asm_written_flag)
+
+/* Nonzero in a _DECL if the name is used in its scope.
+   Nonzero in an expr node means inhibit warning if value is unused.
+   In IDENTIFIER_NODEs, this means that some extern decl for this name
+   was used.  */
+#define TREE_USED(NODE) ((NODE)->common.used_flag)
+
+/* Nonzero for a tree node whose evaluation could result
+   in the raising of an exception.  Not implemented yet.  */
+#define TREE_RAISES(NODE) ((NODE)->common.raises_flag)
+
+/* These are currently used in classes in C++.  */
+#define TREE_PRIVATE(NODE) ((NODE)->common.private_flag)
+#define TREE_PROTECTED(NODE) ((NODE)->common.protected_flag)
+
+#define TREE_LANG_FLAG_0(NODE) ((NODE)->common.lang_flag_0)
+#define TREE_LANG_FLAG_1(NODE) ((NODE)->common.lang_flag_1)
+#define TREE_LANG_FLAG_2(NODE) ((NODE)->common.lang_flag_2)
+#define TREE_LANG_FLAG_3(NODE) ((NODE)->common.lang_flag_3)
+#define TREE_LANG_FLAG_4(NODE) ((NODE)->common.lang_flag_4)
+#define TREE_LANG_FLAG_5(NODE) ((NODE)->common.lang_flag_5)
+#define TREE_LANG_FLAG_6(NODE) ((NODE)->common.lang_flag_6)
+
+/* Define additional fields and accessors for nodes representing constants.  */
+
+/* In an INTEGER_CST node.  These two together make a 64 bit integer.
+   If the data type is signed, the value is sign-extended to 64 bits
+   even though not all of them may really be in use.
+   In an unsigned constant shorter than 64 bits, the extra bits are 0.  */
+#define TREE_INT_CST_LOW(NODE) ((NODE)->int_cst.int_cst_low)
+#define TREE_INT_CST_HIGH(NODE) ((NODE)->int_cst.int_cst_high)
+
+#define INT_CST_LT(A, B)  \
+(TREE_INT_CST_HIGH (A) < TREE_INT_CST_HIGH (B)			\
+ || (TREE_INT_CST_HIGH (A) == TREE_INT_CST_HIGH (B)		\
+     && ((unsigned) TREE_INT_CST_LOW (A) < (unsigned) TREE_INT_CST_LOW (B))))
+
+#define INT_CST_LT_UNSIGNED(A, B)  \
+((unsigned) TREE_INT_CST_HIGH (A) < (unsigned) TREE_INT_CST_HIGH (B)	  \
+ || ((unsigned) TREE_INT_CST_HIGH (A) == (unsigned) TREE_INT_CST_HIGH (B) \
+     && ((unsigned) TREE_INT_CST_LOW (A) < (unsigned) TREE_INT_CST_LOW (B))))
+
+struct tree_int_cst
+{
+  char common[sizeof (struct tree_common)];
+  long int_cst_low;
+  long int_cst_high;
+};
+
+/* In REAL_CST, STRING_CST, COMPLEX_CST nodes, and CONSTRUCTOR nodes,
+   and generally in all kinds of constants that could
+   be given labels (rather than being immediate).  */
+
+#define TREE_CST_RTL(NODE) ((NODE)->real_cst.rtl)
+
+/* In a REAL_CST node.  */
+/* We can represent a real value as either a `double' or a string.
+   Strings don't allow for any optimization, but they do allow
+   for cross-compilation.  */
+
+#define TREE_REAL_CST(NODE) ((NODE)->real_cst.real_cst)
+
+#include "real.h"
+
+struct tree_real_cst
+{
+  char common[sizeof (struct tree_common)];
+  struct rtx_def *rtl;	/* acts as link to register transfer language
+				   (rtl) info */
+  REAL_VALUE_TYPE real_cst;
+};
+
+/* In a STRING_CST */
+#define TREE_STRING_LENGTH(NODE) ((NODE)->string.length)
+#define TREE_STRING_POINTER(NODE) ((NODE)->string.pointer)
+
+struct tree_string
+{
+  char common[sizeof (struct tree_common)];
+  struct rtx_def *rtl;	/* acts as link to register transfer language
+				   (rtl) info */
+  int length;
+  char *pointer;
+};
+
+/* In a COMPLEX_CST node.  */
+#define TREE_REALPART(NODE) ((NODE)->complex.real)
+#define TREE_IMAGPART(NODE) ((NODE)->complex.imag)
+
+struct tree_complex
+{
+  char common[sizeof (struct tree_common)];
+  struct rtx_def *rtl;	/* acts as link to register transfer language
+				   (rtl) info */
+  union tree_node *real;
+  union tree_node *imag;
+};
+
+/* Define fields and accessors for some special-purpose tree nodes.  */
+
+#define IDENTIFIER_LENGTH(NODE) ((NODE)->identifier.length)
+#define IDENTIFIER_POINTER(NODE) ((NODE)->identifier.pointer)
+#define IDENTIFIER_VIRTUAL_P(NODE) TREE_LANG_FLAG_1(NODE)
+
+struct tree_identifier
+{
+  char common[sizeof (struct tree_common)];
+  int length;
+  char *pointer;
+};
+
+/* In a TREE_LIST node.  */
+#define TREE_PURPOSE(NODE) ((NODE)->list.purpose)
+#define TREE_VALUE(NODE) ((NODE)->list.value)
+
+struct tree_list
+{
+  char common[sizeof (struct tree_common)];
+  union tree_node *purpose;
+  union tree_node *value;
+};
+
+/* In a TREE_VEC node.  */
+#define TREE_VEC_LENGTH(NODE) ((NODE)->vec.length)
+#define TREE_VEC_ELT(NODE,I) ((NODE)->vec.a[I])
+#define TREE_VEC_END(NODE) (&((NODE)->vec.a[(NODE)->vec.length]))
+
+struct tree_vec
+{
+  char common[sizeof (struct tree_common)];
+  int length;
+  union tree_node *a[1];
+};
+
+/* Define fields and accessors for some nodes that represent expressions.  */
+
+/* In a SAVE_EXPR node.  */
+#define SAVE_EXPR_CONTEXT(NODE) TREE_OPERAND(NODE, 1)
+#define SAVE_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[2])
+
+/* In a RTL_EXPR node.  */
+#define RTL_EXPR_SEQUENCE(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[0])
+#define RTL_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[1])
+
+/* In a CALL_EXPR node.  */
+#define CALL_EXPR_RTL(NODE) (*(struct rtx_def **) &(NODE)->exp.operands[2])
+
+/* In a CONSTRUCTOR node.  */
+#define CONSTRUCTOR_ELTS(NODE) TREE_OPERAND (NODE, 1)
+
+/* In a BLOCK node.  */
+#define BLOCK_VARS(NODE) ((NODE)->exp.operands[0])
+#define BLOCK_TYPE_TAGS(NODE) ((NODE)->exp.operands[1])
+#define BLOCK_SUBBLOCKS(NODE) ((NODE)->exp.operands[2])
+#define BLOCK_SUPERCONTEXT(NODE) ((NODE)->exp.operands[3])
+/* Note: when changing this, make sure to find the places
+   that use chainon or nreverse.  */
+#define BLOCK_CHAIN(NODE) TREE_CHAIN (NODE)
+
+/* Nonzero means that this block is prepared to handle exceptions
+   listed in the BLOCK_VARS slot.  */
+#define BLOCK_HANDLER_BLOCK(NODE) TREE_PROTECTED(NODE)
+
+/* In ordinary expression nodes.  */
+#define TREE_OPERAND(NODE, I) ((NODE)->exp.operands[I])
+#define TREE_COMPLEXITY(NODE) ((NODE)->exp.complexity)
+
+struct tree_exp
+{
+  char common[sizeof (struct tree_common)];
+  int complexity;
+  union tree_node *operands[1];
+};
+
+/* Define fields and accessors for nodes representing data types.  */
+
+/* See tree.def for documentation of the use of these fields.
+   Look at the documentation of the various ..._TYPE tree codes.  */
+
+#define TYPE_UID(NODE) ((NODE)->type.uid)
+#define TYPE_SIZE(NODE) ((NODE)->type.size)
+#define TYPE_MODE(NODE) ((NODE)->type.mode)
+#define TYPE_ALIGN(NODE) ((NODE)->type.align)
+#define TYPE_VALUES(NODE) ((NODE)->type.values)
+#define TYPE_DOMAIN(NODE) ((NODE)->type.values)
+#define TYPE_FIELDS(NODE) ((NODE)->type.values)
+#define TYPE_METHODS(NODE) ((NODE)->type.maxval)
+#define TYPE_VFIELD(NODE) ((NODE)->type.minval)
+#define TYPE_ARG_TYPES(NODE) ((NODE)->type.values)
+#define TYPE_METHOD_BASETYPE(NODE) ((NODE)->type.maxval)
+#define TYPE_OFFSET_BASETYPE(NODE) ((NODE)->type.maxval)
+#define TYPE_POINTER_TO(NODE) ((NODE)->type.pointer_to)
+#define TYPE_REFERENCE_TO(NODE) ((NODE)->type.reference_to)
+#define TYPE_MIN_VALUE(NODE) ((NODE)->type.minval)
+#define TYPE_MAX_VALUE(NODE) ((NODE)->type.maxval)
+#define TYPE_PRECISION(NODE) ((NODE)->type.precision)
+#define TYPE_PARSE_INFO(NODE) ((NODE)->type.parse_info)
+#define TYPE_SYMTAB_ADDRESS(NODE) ((NODE)->type.symtab_address)
+#define TYPE_NAME(NODE) ((NODE)->type.name)
+#define TYPE_NEXT_VARIANT(NODE) ((NODE)->type.next_variant)
+#define TYPE_MAIN_VARIANT(NODE) ((NODE)->type.main_variant)
+#define TYPE_BINFO(NODE) ((NODE)->type.binfo)
+#define TYPE_NONCOPIED_PARTS(NODE) ((NODE)->type.noncopied_parts)
+#define TYPE_CONTEXT(NODE) ((NODE)->type.context)
+#define TYPE_LANG_SPECIFIC(NODE) ((NODE)->type.lang_specific)
+
+#define TYPE_STUB_DECL(NODE) (TREE_CHAIN (NODE))
+
+/* In a RECORD_TYPE or UNION_TYPE, it means the type has BLKmode
+   only because it lacks the alignment requirement for its size.  */
+#define TYPE_NO_FORCE_BLK(NODE) ((NODE)->type.no_force_blk_flag)
+
+/* Nonzero in a type considered volatile as a whole.  */
+#define TYPE_VOLATILE(NODE) ((NODE)->common.volatile_flag)
+
+/* Means this type is const-qualified.  */
+#define TYPE_READONLY(NODE) ((NODE)->common.readonly_flag)
+
+#define TYPE_LANG_FLAG_0(NODE) ((NODE)->type.lang_flag_0)
+#define TYPE_LANG_FLAG_1(NODE) ((NODE)->type.lang_flag_1)
+#define TYPE_LANG_FLAG_2(NODE) ((NODE)->type.lang_flag_2)
+#define TYPE_LANG_FLAG_3(NODE) ((NODE)->type.lang_flag_3)
+#define TYPE_LANG_FLAG_4(NODE) ((NODE)->type.lang_flag_4)
+#define TYPE_LANG_FLAG_5(NODE) ((NODE)->type.lang_flag_5)
+#define TYPE_LANG_FLAG_6(NODE) ((NODE)->type.lang_flag_6)
+
+struct tree_type
+{
+  char common[sizeof (struct tree_common)];
+  union tree_node *values;
+  union tree_node *size;
+  unsigned uid;
+
+#ifdef ONLY_INT_FIELDS
+  int mode : 8;
+#else
+  enum machine_mode mode : 8;
+#endif
+  unsigned char align;
+  unsigned char precision;
+
+  unsigned no_force_blk_flag : 1;
+  unsigned lang_flag_0 : 1;
+  unsigned lang_flag_1 : 1;
+  unsigned lang_flag_2 : 1;
+  unsigned lang_flag_3 : 1;
+  unsigned lang_flag_4 : 1;
+  unsigned lang_flag_5 : 1;
+  unsigned lang_flag_6 : 1;
+
+  union tree_node *pointer_to;
+  union tree_node *reference_to;
+  int parse_info;
+  int symtab_address;
+  union tree_node *name;
+  union tree_node *minval;
+  union tree_node *maxval;
+  union tree_node *next_variant;
+  union tree_node *main_variant;
+  union tree_node *binfo;
+  union tree_node *noncopied_parts;
+  union tree_node *context;
+  /* Points to a structure whose details depend on the language in use.  */
+  struct lang_type *lang_specific;
+};
+
+/* Define accessor macros for information about type inheritance
+   and basetypes.
+
+   A "basetype" means a particular usage of a data type for inheritance
+   in another type.  Each such basetype usage has its own "binfo"
+   object to describe it.  The binfo object is a TREE_VEC node.
+
+   Inheritance is represented by the binfo nodes allocated for a
+   given type.  For example, given types C and D, such that D is
+   inherited by C, 3 binfo nodes will be allocated: one for describing
+   the binfo properties of C, similarly one for D, and one for
+   describing the binfo properties of D as a base type for C.
+   Thus, given a pointer to class C, one can get a pointer to the binfo
+   of D acting as a basetype for C by looking at C's binfo's basetypes.  */
+
+/* The actual data type node being inherited in this basetype.  */
+#define BINFO_TYPE(NODE) TREE_TYPE (NODE)
+
+/* The offset where this basetype appears in its containing type.
+   BINFO_OFFSET slot holds the offset (in bytes)
+   from the base of the complete object to the base of the part of the
+   object that is allocated on behalf of this `type'.
+   This is always 0 except when there is multiple inheritance.  */
+   
+#define BINFO_OFFSET(NODE) TREE_VEC_ELT ((NODE), 1)
+#define TYPE_BINFO_OFFSET(NODE) BINFO_OFFSET (TYPE_BINFO (NODE))
+#define BINFO_OFFSET_ZEROP(NODE) (BINFO_OFFSET (NODE) == integer_zero_node)
+
+/* The virtual function table belonging to this basetype.  Virtual
+   function tables provide a mechanism for run-time method dispatching.
+   The entries of a virtual function table are language-dependent.  */
+
+#define BINFO_VTABLE(NODE) TREE_VEC_ELT ((NODE), 2)
+#define TYPE_BINFO_VTABLE(NODE) BINFO_VTABLE (TYPE_BINFO (NODE))
+
+/* The virtual functions in the virtual function table.  This is
+   a TREE_LIST that is used as an initial approximation for building
+   a virtual function table for this basetype.  */
+#define BINFO_VIRTUALS(NODE) TREE_VEC_ELT ((NODE), 3)
+#define TYPE_BINFO_VIRTUALS(NODE) BINFO_VIRTUALS (TYPE_BINFO (NODE))
+
+/* A vector of additional binfos for the types inherited by this basetype.
+
+   If this basetype describes type D as inherited in C,
+   and if the basetypes of D are E anf F,
+   then this vector contains binfos for inheritance of E and F by C.
+
+   ??? This could probably be done by just allocating the
+   base types at the end of this TREE_VEC (instead of using
+   another TREE_VEC).  This would simplify the calculation
+   of how many basetypes a given type had.  */
+#define BINFO_BASETYPES(NODE) TREE_VEC_ELT ((NODE), 4)
+#define TYPE_BINFO_BASETYPES(NODE) TREE_VEC_ELT (TYPE_BINFO (NODE), 4)
+
+/* Accessor macro to get to the Nth basetype of this basetype.  */
+#define BINFO_BASETYPE(NODE,N) TREE_VEC_ELT (BINFO_BASETYPES (NODE), (N))
+#define TYPE_BINFO_BASETYPE(NODE,N) BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (NODE)), (N)))
+
+/* Slot used to build a chain that represents a use of inheritance.
+   For example, if X is derived from Y, and Y is derived from Z,
+   then this field can be used to link the binfo node for X to
+   the binfo node for X's Y to represent the use of inheritance
+   from X to Y.  Similarly, this slot of the binfo node for X's Y
+   can point to the Z from which Y is inherited (in X's inheritance
+   hierarchy).  In this fashion, one can represent and traverse specific
+   uses of inheritance using the binfo nodes themselves (instead of
+   consing new space pointing to binfo nodes).
+   It is up to the language-dependent front-ends to maintain
+   this information as necessary.  */
+#define BINFO_INHERITANCE_CHAIN(NODE) TREE_VEC_ELT ((NODE), 0)
+
+/* Define fields and accessors for nodes representing declared names.  */
+
+/* This is the name of the object as written by the user.
+   It is an IDENTIFIER_NODE.  */
+#define DECL_NAME(NODE) ((NODE)->decl.name)
+/* This macro is marked for death.  */
+#define DECL_PRINT_NAME(NODE) ((NODE)->decl.print_name)
+/* This is the name of the object as the assembler will see it
+   (but before any translations made by ASM_OUTPUT_LABELREF).
+   Often this is the same as DECL_NAME.
+   It is an IDENTIFIER_NODE.  */
+#define DECL_ASSEMBLER_NAME(NODE) ((NODE)->decl.assembler_name)
+/* The containing binding context; either a BINDING
+   or a RECORD_TYPE or UNION_TYPE.  */
+#define DECL_CONTEXT(NODE) ((NODE)->decl.context)
+#define DECL_FIELD_CONTEXT(NODE) ((NODE)->decl.context)
+/* In a FIELD_DECL, this is the field position, counting in bits,
+   of the bit closest to the beginning of the structure.  */
+#define DECL_FIELD_BITPOS(NODE) ((NODE)->decl.arguments)
+/* In a FIELD_DECL, this indicates whether the field was a bit-field and
+   if so, its type.  */
+#define DECL_BIT_FIELD_TYPE(NODE) ((NODE)->decl.result)
+/* In FUNCTION_DECL, a chain of ..._DECL nodes.  */
+/* VAR_DECL and PARM_DECL reserve the arguments slot
+   for language-specific uses.  */
+#define DECL_ARGUMENTS(NODE) ((NODE)->decl.arguments)
+/* In FUNCTION_DECL, holds the decl for the return value.  */
+#define DECL_RESULT(NODE) ((NODE)->decl.result)
+/* In PARM_DECL, holds the type as written (perhaps a function or array).  */
+#define DECL_ARG_TYPE_AS_WRITTEN(NODE) ((NODE)->decl.result)
+/* For a FUNCTION_DECL, holds the tree of BINDINGs.
+   For a VAR_DECL, holds the initial value.
+   For a PARM_DECL, not used--default
+   values for parameters are encoded in the type of the function,
+   not in the PARM_DECL slot.  */
+#define DECL_INITIAL(NODE) ((NODE)->decl.initial)
+/* For a PARM_DECL, records the data type used to pass the argument,
+   which may be different from the type seen in the program.  */
+#define DECL_ARG_TYPE(NODE) ((NODE)->decl.initial)   /* In PARM_DECL.  */
+/* These two fields describe where in the source code the declaration was.  */
+#define DECL_SOURCE_FILE(NODE) ((NODE)->decl.filename)
+#define DECL_SOURCE_LINE(NODE) ((NODE)->decl.linenum)
+/* Holds the size of the datum, as a tree expression.
+   Need not be constant.  */
+#define DECL_SIZE(NODE) ((NODE)->decl.size)
+/* Holds the alignment required for the datum.  */
+#define DECL_ALIGN(NODE) ((NODE)->decl.align)
+/* Holds the machine mode of a variable or field.  */
+#define DECL_MODE(NODE) ((NODE)->decl.mode)
+/* Holds the RTL expression for the value of a variable or function.  */
+#define DECL_RTL(NODE) ((NODE)->decl.rtl)
+/* For PARM_DECL, holds an RTL for the stack slot or register
+   where the data was actually passed.  */
+#define DECL_INCOMING_RTL(NODE) ((NODE)->decl.saved_insns)
+/* For FUNCTION_DECL, if it is inline, holds the saved insn chain.  */
+#define DECL_SAVED_INSNS(NODE) ((NODE)->decl.saved_insns)
+/* For FUNCTION_DECL for built-in function.  */
+#define DECL_FUNCTION_CODE(NODE) \
+ ((enum built_in_function) (NODE)->decl.frame_size)
+#define DECL_SET_FUNCTION_CODE(NODE,VAL) \
+ ((NODE)->decl.frame_size = (int) (VAL))
+/* For FUNCTION_DECL, if it is inline,
+   holds the size of the stack frame, as an integer.  */
+#define DECL_FRAME_SIZE(NODE) ((NODE)->decl.frame_size)
+
+/* The DECL_VINDEX is used for FUNCTION_DECLS in two different ways.
+   Before the struct containing the FUNCTION_DECL is laid out,
+   DECL_VINDEX may point to a FUNCTION_DECL in a base class which
+   is the FUNCTION_DECL which this FUNCTION_DECL will replace as a virtual
+   function.  When the class is laid out, this pointer is changed
+   to an INTEGER_CST node which is suitable for use as an index
+   into the virtual function table.  */
+#define DECL_VINDEX(NODE) ((NODE)->decl.vindex)
+/* For FIELD_DECLS, DECL_FCONTEXT is the *first* baseclass in
+   which this FIELD_DECL is defined.  This information is needed when
+   writing debugging information about vfield and vbase decls for C++.  */
+#define DECL_FCONTEXT(NODE) ((NODE)->decl.vindex)
+
+/* Nonzero in a VAR_DECL or PARM_DECL means this decl was made by inlining;
+   suppress any warnings about shadowing some other variable.  */
+#define DECL_FROM_INLINE(NODE) ((NODE)->decl.from_inline_flag)
+
+/* Nonzero if a _DECL means that the name of this decl should be ignored
+   for symbolic debug purposes.  */
+#define DECL_IGNORED_P(NODE) ((NODE)->decl.ignored_flag)
+
+#define DECL_LANG_SPECIFIC(NODE) ((NODE)->decl.lang_specific)
+
+/* In a VAR_DECL or FUNCTION_DECL,
+   nonzero means external reference:
+   do not allocate storage, and refer to a definition elsewhere.  */
+#define TREE_EXTERNAL(NODE) ((NODE)->decl.external_flag)
+
+/* In VAR_DECL and PARM_DECL nodes, nonzero means declared `register'.
+   In LABEL_DECL nodes, nonzero means that an error message about
+   jumping into such a binding contour has been printed for this label.  */
+#define TREE_REGDECL(NODE) ((NODE)->decl.regdecl_flag)
+
+/* Nonzero in a ..._DECL means this variable is ref'd from a nested function.
+   For VAR_DECL nodes, PARM_DECL nodes, and FUNCTION_DECL nodes.
+
+   For LABEL_DECL nodes, nonzero if nonlocal gotos to the label are permitted.
+
+   Also set in some languages for variables, etc., outside the normal
+   lexical scope, such as class instance variables.  */
+#define TREE_NONLOCAL(NODE) ((NODE)->decl.nonlocal_flag)
+
+/* Nonzero in a FUNCTION_DECL means this function can be substituted
+   where it is called.  */
+#define TREE_INLINE(NODE) ((NODE)->decl.inline_flag)
+
+/* Nonzero in a FUNCTION_DECL means this is a built-in function
+   that is not specified by ansi C and that users are supposed to be allowed
+   to redefine for any purpose whatever.  */
+#define DECL_BUILT_IN_NONANSI(NODE) ((NODE)->common.unsigned_flag)
+
+/* Nonzero in a FIELD_DECL means it is a bit field, and must be accessed
+   specially.  */
+#define DECL_BIT_FIELD(NODE) ((NODE)->decl.bit_field_flag)
+/* In a LABEL_DECL, nonzero means label was defined inside a binding
+   contour that restored a stack level and which is now exited.  */
+#define DECL_TOO_LATE(NODE) ((NODE)->decl.bit_field_flag)
+/* In a FUNCTION_DECL, nonzero means a built in function.  */
+#define DECL_BUILT_IN(NODE) ((NODE)->decl.bit_field_flag)
+
+/* In a METHOD_DECL, indicates a function for which each instance has a pointer.  */
+#define DECL_VIRTUAL_P(NODE) ((NODE)->decl.virtual_flag)
+/* In a FIELD_DECL, indicates this field should be bit-packed.  */
+#define DECL_PACKED(NODE) ((NODE)->decl.virtual_flag)
+
+/* Additional flags for language-specific uses.  */
+#define DECL_LANG_FLAG_0(NODE) ((NODE)->decl.lang_flag_0)
+#define DECL_LANG_FLAG_1(NODE) ((NODE)->decl.lang_flag_1)
+#define DECL_LANG_FLAG_2(NODE) ((NODE)->decl.lang_flag_2)
+#define DECL_LANG_FLAG_3(NODE) ((NODE)->decl.lang_flag_3)
+#define DECL_LANG_FLAG_4(NODE) ((NODE)->decl.lang_flag_4)
+#define DECL_LANG_FLAG_5(NODE) ((NODE)->decl.lang_flag_5)
+#define DECL_LANG_FLAG_6(NODE) ((NODE)->decl.lang_flag_6)
+#define DECL_LANG_FLAG_7(NODE) ((NODE)->decl.lang_flag_7)
+
+struct tree_decl
+{
+  char common[sizeof (struct tree_common)];
+  char *filename;
+  int linenum;
+  union tree_node *size;
+#ifdef ONLY_INT_FIELDS
+  int mode : 8;
+#else
+  enum machine_mode mode : 8;
+#endif
+  unsigned char align;
+
+  unsigned external_flag : 1;
+  unsigned nonlocal_flag : 1;
+  unsigned regdecl_flag : 1;
+  unsigned inline_flag : 1;
+  unsigned bit_field_flag : 1;
+  unsigned virtual_flag : 1;
+  unsigned from_inline_flag : 1;
+  unsigned ignored_flag : 1;
+
+  unsigned lang_flag_0 : 1;
+  unsigned lang_flag_1 : 1;
+  unsigned lang_flag_2 : 1;
+  unsigned lang_flag_3 : 1;
+  unsigned lang_flag_4 : 1;
+  unsigned lang_flag_5 : 1;
+  unsigned lang_flag_6 : 1;
+  unsigned lang_flag_7 : 1;
+
+  union tree_node *name;
+  union tree_node *context;
+  union tree_node *arguments;
+  union tree_node *result;
+  union tree_node *initial;
+  /* The PRINT_NAME field is marked for death.  */
+  char *print_name;
+  union tree_node *assembler_name;
+  struct rtx_def *rtl;	/* acts as link to register transfer language
+				   (rtl) info */
+  int frame_size;		/* For FUNCTION_DECLs: size of stack frame */
+  struct rtx_def *saved_insns;	/* For FUNCTION_DECLs: points to insn that
+				   constitutes its definition on the
+				   permanent obstack.  */
+  union tree_node *vindex;
+  /* Points to a structure whose details depend on the language in use.  */
+  struct lang_decl *lang_specific;
+};
+
+/* Define the overall contents of a tree node.
+   It may be any of the structures declared above
+   for various types of node.  */
+
+union tree_node
+{
+  struct tree_common common;
+  struct tree_int_cst int_cst;
+  struct tree_real_cst real_cst;
+  struct tree_string string;
+  struct tree_complex complex;
+  struct tree_identifier identifier;
+  struct tree_decl decl;
+  struct tree_type type;
+  struct tree_list list;
+  struct tree_vec vec;
+  struct tree_exp exp;
+ };
+
+/* Format for global names of constructor and destructor functions.  */
+#ifndef NO_DOLLAR_IN_LABEL
+#define CONSTRUCTOR_NAME_FORMAT "_GLOBAL_$I$%s"
+#else
+#define CONSTRUCTOR_NAME_FORMAT "_GLOBAL_.I.%s"
+#endif
+
+extern char *oballoc ();
+extern char *permalloc ();
+extern char *savealloc ();
+
+/* Lowest level primitive for allocating a node.
+   The TREE_CODE is the only argument.  Contents are initialized
+   to zero except for a few of the common fields.  */
+
+extern tree make_node ();
+
+/* Make a copy of a node, with all the same contents except
+   for TREE_PERMANENT.  (The copy is permanent
+   iff nodes being made now are permanent.)  */
+
+extern tree copy_node ();
+
+/* Make a copy of a chain of TREE_LIST nodes.  */
+
+extern tree copy_list ();
+
+/* Make a TREE_VEC.  */
+
+extern tree make_tree_vec ();
+
+/* Return the (unique) IDENTIFIER_NODE node for a given name.
+   The name is supplied as a char *.  */
+
+extern tree get_identifier ();
+
+/* Construct various types of nodes.  */
+
+extern tree build_int_2 ();
+extern tree build_real ();
+extern tree build_real_from_string ();
+extern tree build_real_from_int_cst ();
+extern tree build_complex ();
+extern tree build_string ();
+extern tree build (), build1 ();
+extern tree build_nt (), build_parse_node ();
+extern tree build_tree_list (), build_decl_list ();
+extern tree build_op_identifier ();
+extern tree build_decl ();
+extern tree build_block ();
+
+/* Construct various nodes representing data types.  */
+
+extern tree make_signed_type ();
+extern tree make_unsigned_type ();
+extern tree signed_or_unsigned_type ();
+extern void fixup_unsigned_type ();
+extern tree build_pointer_type ();
+extern tree build_reference_type ();
+extern tree build_index_type (), build_index_2_type ();
+extern tree build_array_type ();
+extern tree build_function_type ();
+extern tree build_method_type ();
+extern tree build_offset_type ();
+extern tree build_complex_type ();
+extern tree array_type_nelts ();
+
+/* Construct expressions, performing type checking.  */
+
+extern tree build_binary_op ();
+extern tree build_indirect_ref ();
+extern tree build_unary_op ();
+
+/* Given a type node TYPE, and CONSTP and VOLATILEP, return a type
+   for the same kind of data as TYPE describes.
+   Variants point to the "main variant" (which has neither CONST nor VOLATILE)
+   via TYPE_MAIN_VARIANT, and it points to a chain of other variants
+   so that duplicate variants are never made.
+   Only main variants should ever appear as types of expressions.  */
+
+extern tree build_type_variant ();
+
+/* Return the mode for data of a given size SIZE and mode class CLASS.
+   If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
+   The value is BLKmode if no other mode is found.  */
+
+extern enum machine_mode mode_for_size ();
+
+/* Given a ..._TYPE node, calculate the TYPE_SIZE, TYPE_SIZE_UNIT,
+   TYPE_ALIGN and TYPE_MODE fields.
+   If called more than once on one node, does nothing except
+   for the first time.  */
+
+extern void layout_type ();
+
+/* Given a hashcode and a ..._TYPE node (for which the hashcode was made),
+   return a canonicalized ..._TYPE node, so that duplicates are not made.
+   How the hash code is computed is up to the caller, as long as any two
+   callers that could hash identical-looking type nodes agree.  */
+
+extern tree type_hash_canon ();
+
+/* Given a VAR_DECL, PARM_DECL, RESULT_DECL or FIELD_DECL node,
+   calculates the DECL_SIZE, DECL_SIZE_UNIT, DECL_ALIGN and DECL_MODE
+   fields.  Call this only once for any given decl node.
+
+   Second argument is the boundary that this field can be assumed to
+   be starting at (in bits).  Zero means it can be assumed aligned
+   on any boundary that may be needed.  */
+
+extern void layout_decl ();
+
+/* Fold constants as much as possible in an expression.
+   Returns the simplified expression.
+   Acts only on the top level of the expression;
+   if the argument itself cannot be simplified, its
+   subexpressions are not changed.  */
+
+extern tree fold ();
+
+/* Return an expr equal to X but certainly not valid as an lvalue.  */
+
+extern tree non_lvalue ();
+
+extern tree convert ();
+extern tree size_in_bytes ();
+extern tree size_binop ();
+extern tree size_int ();
+extern tree round_up ();
+extern tree get_pending_sizes ();
+extern tree get_permanent_types (), get_temporary_types ();
+
+/* Type for sizes of data-type.  */
+
+extern tree sizetype;
+
+/* Concatenate two lists (chains of TREE_LIST nodes) X and Y
+   by making the last node in X point to Y.
+   Returns X, except if X is 0 returns Y.  */
+
+extern tree chainon ();
+
+/* Make a new TREE_LIST node from specified PURPOSE, VALUE and CHAIN.  */
+
+extern tree tree_cons (), perm_tree_cons (), temp_tree_cons ();
+extern tree saveable_tree_cons (), decl_tree_cons ();
+
+/* Return the last tree node in a chain.  */
+
+extern tree tree_last ();
+
+/* Reverse the order of elements in a chain, and return the new head.  */
+
+extern tree nreverse ();
+
+/* Make a copy of a chain of tree nodes.  */
+
+extern tree copy_chain ();
+
+/* Returns the length of a chain of nodes
+   (number of chain pointers to follow before reaching a null pointer).  */
+
+extern int list_length ();
+
+/* integer_zerop (tree x) is nonzero if X is an integer constant of value 0 */
+
+extern int integer_zerop ();
+
+/* integer_onep (tree x) is nonzero if X is an integer constant of value 1 */
+
+extern int integer_onep ();
+
+/* integer_all_onesp (tree x) is nonzero if X is an integer constant
+   all of whose significant bits are 1.  */
+
+extern int integer_all_onesp ();
+
+/* integer_pow2p (tree x) is nonzero is X is an integer constant with
+   exactly one bit 1.  */
+
+extern int integer_pow2p ();
+
+/* type_unsigned_p (tree x) is nonzero if the type X is an unsigned type
+   (all of its possible values are >= 0).
+   If X is a pointer type, the value is 1.
+   If X is a real type, the value is 0.  */
+
+extern int type_unsigned_p ();
+
+/* staticp (tree x) is nonzero if X is a reference to data allocated
+   at a fixed address in memory.  */
+
+extern int staticp ();
+
+/* Gets an error if argument X is not an lvalue.
+   Also returns 1 if X is an lvalue, 0 if not.  */
+
+extern int lvalue_or_else ();
+
+/* save_expr (EXP) returns an expression equivalent to EXP
+   but it can be used multiple times within context CTX
+   and only evaluate EXP once.  */
+
+extern tree save_expr ();
+
+/* stabilize_reference (EXP) returns an reference equivalent to EXP
+   but it can be used multiple times
+   and only evaluate the subexpressions once.  */
+
+extern tree stabilize_reference ();
+
+/* Return EXP, stripped of any conversions to wider types
+   in such a way that the result of converting to type FOR_TYPE
+   is the same as if EXP were converted to FOR_TYPE.
+   If FOR_TYPE is 0, it signifies EXP's type.  */
+
+extern tree get_unwidened ();
+
+/* Return OP or a simpler expression for a narrower value
+   which can be sign-extended or zero-extended to give back OP.
+   Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
+   or 0 if the value should be sign-extended.  */
+
+extern tree get_narrower ();
+
+/* Given MODE and UNSIGNEDP, return a suitable type-tree
+   with that mode.
+   The definition of this resides in language-specific code
+   as the repertoire of available types may vary.  */
+
+extern tree type_for_mode ();
+
+/* Given PRECISION and UNSIGNEDP, return a suitable type-tree
+   for an integer type with at least that precision.
+   The definition of this resides in language-specific code
+   as the repertoire of available types may vary.  */
+
+extern tree type_for_size ();
+
+/* Given an integer type T, return a type like T but unsigned.
+   If T is unsigned, the value is T.
+   The definition of this resides in language-specific code
+   as the repertoire of available types may vary.  */
+
+extern tree unsigned_type ();
+
+/* Given an integer type T, return a type like T but signed.
+   If T is signed, the value is T.
+   The definition of this resides in language-specific code
+   as the repertoire of available types may vary.  */
+
+extern tree signed_type ();
+
+/* This function must be defined in the language-specific files.
+   expand_expr calls it to build the cleanup-expression for a TARGET_EXPR.
+   This is defined in a language-specific file.  */
+
+extern tree maybe_build_cleanup ();
+
+/* Return the floating type node for a given floating machine mode.  */
+
+extern tree get_floating_type ();
+
+/* Given an expression EXP that may be a COMPONENT_REF or an ARRAY_REF,
+   look for nested component-refs or array-refs at constant positions
+   and find the ultimate containing object, which is returned.  */
+
+extern tree get_inner_reference ();
+
+/* Return the FUNCTION_DECL which provides this _DECL with its context,
+   or zero if none.  */
+extern tree decl_function_context ();
+
+/* Return the RECORD_TYPE or UNION_TYPE which provides this _DECL
+   with its context, or zero if none.  */
+extern tree decl_type_context ();
+
+/* Given the FUNCTION_DECL for the current function,
+   return zero if it is ok for this function to be inline.
+   Otherwise return a warning message with a single %s
+   for the function's name.  */
+
+extern char *function_cannot_inline_p ();
+
+/* Declare commonly used variables for tree structure.  */
+
+/* An integer constant with value 0 */
+extern tree integer_zero_node;
+
+/* An integer constant with value 1 */
+extern tree integer_one_node;
+
+/* An integer constant with value 0 whose type is sizetype.  */
+extern tree size_zero_node;
+
+/* An integer constant with value 1 whose type is sizetype.  */
+extern tree size_one_node;
+
+/* A constant of type pointer-to-int and value 0 */
+extern tree null_pointer_node;
+
+/* A node of type ERROR_MARK.  */
+extern tree error_mark_node;
+
+/* The type node for the void type.  */
+extern tree void_type_node;
+
+/* The type node for the ordinary (signed) integer type.  */
+extern tree integer_type_node;
+
+/* The type node for the unsigned integer type.  */
+extern tree unsigned_type_node;
+
+/* The type node for the ordinary character type.  */
+extern tree char_type_node;
+
+/* Points to the name of the input file from which the current input
+   being parsed originally came (before it went into cpp).  */
+extern char *input_filename;
+
+/* Current line number in input file.  */
+extern int lineno;
+
+/* Nonzero for -pedantic switch: warn about anything
+   that standard C forbids.  */
+extern int pedantic;
+
+/* Nonzero means can safely call expand_expr now;
+   otherwise layout_type puts variable sizes onto `pending_sizes' instead.  */
+
+extern int immediate_size_expand;
+
+/* Points to the FUNCTION_DECL of the function whose body we are reading. */
+
+extern tree current_function_decl;
+
+/* Nonzero if function being compiled can call setjmp.  */
+
+extern int current_function_calls_setjmp;
+
+/* Nonzero if function being compiled can call longjmp.  */
+
+extern int current_function_calls_longjmp;
+
+/* Nonzero means all ..._TYPE nodes should be allocated permanently.  */
+
+extern int all_types_permanent;
+
+/* Pointer to function to compute the name to use to print a declaration.  */
+
+extern char *(*decl_printable_name) ();
+
+/* In expmed.c */
+extern tree make_tree ();
+
+/* In stmt.c */
+
+extern tree expand_start_stmt_expr ();
+extern tree expand_end_stmt_expr ();
+extern void expand_expr_stmt (), clear_last_expr ();
+extern void expand_label (), expand_goto (), expand_asm ();
+extern void expand_start_cond (), expand_end_cond ();
+extern void expand_start_else (), expand_start_elseif ();
+extern struct nesting *expand_start_loop ();
+extern struct nesting *expand_start_loop_continue_elsewhere ();
+extern void expand_loop_continue_here ();
+extern void expand_end_loop ();
+extern int expand_continue_loop ();
+extern int expand_exit_loop (), expand_exit_loop_if_false ();
+extern int expand_exit_something ();
+
+extern void expand_start_delayed_expr ();
+extern tree expand_end_delayed_expr ();
+extern void expand_emit_delayed_expr ();
+
+extern void expand_null_return (), expand_return ();
+extern void expand_start_bindings (), expand_end_bindings ();
+extern tree last_cleanup_this_contour ();
+extern void expand_start_case (), expand_end_case ();
+extern int pushcase (), pushcase_range ();
+extern void expand_start_function (), expand_end_function ();
+
+/* In fold-const.c */
+
+extern tree invert_truthvalue ();
+
+/* The language front-end must define these functions.  */
+
+/* Function of no arguments for initializing lexical scanning.  */
+extern void init_lex ();
+/* Function of no arguments for initializing the symbol table.  */
+extern void init_decl_processing ();
+
+/* Functions called with no arguments at the beginning and end or processing
+   the input source file.  */
+extern void lang_init ();
+extern void lang_finish ();
+
+/* Function called with no arguments to parse and compile the input.  */
+extern int yyparse ();
+/* Function called with option as argument
+   to decode options starting with -f or -W or +.
+   It should return nonzero if it handles the option.  */
+extern int lang_decode_option ();
+
+/* Functions for processing symbol declarations.  */
+/* Function to enter a new lexical scope.
+   Takes one argument: always zero when called from outside the front end.  */
+extern void pushlevel ();
+/* Function to exit a lexical scope.  It returns a BINDING for that scope.
+   Takes three arguments:
+     KEEP -- nonzero if there were declarations in this scope.
+     REVERSE -- reverse the order of decls before returning them.
+     FUNCTIONBODY -- nonzero if this level is the body of a function.  */
+extern tree poplevel ();
+/* Function to add a decl to the current scope level.
+   Takes one argument, a decl to add.
+   Returns that decl, or, if the same symbol is already declared, may
+   return a different decl for that name.  */
+extern tree pushdecl ();
+/* Function to return the chain of decls so far in the current scope level.  */
+extern tree getdecls ();
+/* Function to return the chain of structure tags in the current scope level.  */
+extern tree gettags ();