tree.h

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extern tree substitute_in_expr		PROTO((tree, tree, tree));

/* Given a type T, a FIELD_DECL F, and a replacement value R,
   return a new type with all size expressions that contain F
   updated by replacing the reference to F with R.  */

extern tree substitute_in_type		PROTO((tree, tree, tree));

/* variable_size (EXP) is like save_expr (EXP) except that it
   is for the special case of something that is part of a
   variable size for a data type.  It makes special arrangements
   to compute the value at the right time when the data type
   belongs to a function parameter.  */

extern tree variable_size		PROTO((tree));

/* 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		PROTO((tree));

/* Subroutine of stabilize_reference; this is called for subtrees of
   references.  Any expression with side-effects must be put in a SAVE_EXPR
   to ensure that it is only evaluated once.  */

extern tree stabilize_reference_1	PROTO((tree));

/* 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		PROTO((tree, tree));

/* 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		PROTO((tree, int *));

/* 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		PROTO((enum machine_mode, int));

/* 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		PROTO((unsigned, int));

/* 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		PROTO((tree));

/* 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			PROTO((tree));

/* 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		PROTO((tree));

/* 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		PROTO((tree, int *, int *, tree *, enum machine_mode *, int *, int *));

/* Return the FUNCTION_DECL which provides this _DECL with its context,
   or zero if none.  */
extern tree decl_function_context 	PROTO((tree));

/* Return the RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE which provides
   this _DECL with its context, or zero if none.  */
extern tree decl_type_context		PROTO((tree));

/* 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 	PROTO((tree));

/* Return 1 if EXPR is the real constant zero.  */
extern int real_zerop PROTO((tree));

/* 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 lvalues are limited to those valid in pedantic ANSI C.
   Zero means allow extended lvalues.  */

extern int pedantic_lvalues;

/* 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) ();

/* Pointer to function to finish handling an incomplete decl at the
   end of compilation.  */

extern void (*incomplete_decl_finalize_hook) ();

/* In tree.c */
extern char *perm_calloc			PROTO((int, long));
extern tree get_set_constructor_bits		PROTO((tree, char*, int));
extern tree get_set_constructor_bytes		PROTO((tree,
						       unsigned char*, int));

/* In stmt.c */

extern void expand_fixups			PROTO((struct rtx_def *));
extern tree expand_start_stmt_expr		PROTO((void));
extern tree expand_end_stmt_expr		PROTO((tree));
extern void expand_expr_stmt			PROTO((tree));
extern int warn_if_unused_value			PROTO((tree));
extern void expand_decl_init			PROTO((tree));
extern void clear_last_expr			PROTO((void));
extern void expand_label			PROTO((tree));
extern void expand_goto				PROTO((tree));
extern void expand_asm				PROTO((tree));
extern void expand_start_cond			PROTO((tree, int));
extern void expand_end_cond			PROTO((void));
extern void expand_start_else			PROTO((void));
extern void expand_start_elseif			PROTO((tree));
extern struct nesting *expand_start_loop 	PROTO((int));
extern struct nesting *expand_start_loop_continue_elsewhere 	PROTO((int));
extern void expand_loop_continue_here		PROTO((void));
extern void expand_end_loop			PROTO((void));
extern int expand_continue_loop			PROTO((struct nesting *));
extern int expand_exit_loop			PROTO((struct nesting *));
extern int expand_exit_loop_if_false		PROTO((struct nesting *,
						       tree));
extern int expand_exit_something		PROTO((void));

extern void expand_null_return			PROTO((void));
extern void expand_return			PROTO((tree));
extern void expand_start_bindings		PROTO((int));
extern void expand_end_bindings			PROTO((tree, int, int));
extern tree last_cleanup_this_contour		PROTO((void));
extern void expand_start_case			PROTO((int, tree, tree,
						       char *));
extern void expand_end_case			PROTO((tree));
extern int pushcase				PROTO((tree,
						       tree (*) (tree, tree),
						       tree, tree *));
extern int pushcase_range			PROTO((tree, tree,
						       tree (*) (tree, tree),
						       tree, tree *));

/* In fold-const.c */

/* 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		PROTO((tree));

extern int force_fit_type	PROTO((tree, int));
extern int add_double		PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT *, HOST_WIDE_INT *));
extern int neg_double		PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT *, HOST_WIDE_INT *));
extern int mul_double		PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT *, HOST_WIDE_INT *));
extern void lshift_double	PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, int, HOST_WIDE_INT *,
				       HOST_WIDE_INT *, int));
extern void rshift_double	PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, int,
				       HOST_WIDE_INT *, HOST_WIDE_INT *, int));
extern void lrotate_double	PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, int, HOST_WIDE_INT *,
				       HOST_WIDE_INT *));
extern void rrotate_double	PROTO((HOST_WIDE_INT, HOST_WIDE_INT,
				       HOST_WIDE_INT, int, HOST_WIDE_INT *,
				       HOST_WIDE_INT *));
extern int operand_equal_p	PROTO((tree, tree, int));
extern tree invert_truthvalue	PROTO((tree));

/* The language front-end must define these functions.  */

/* Function of no arguments for initializing lexical scanning.  */
extern void init_lex				PROTO((void));
/* Function of no arguments for initializing the symbol table.  */
extern void init_decl_processing		PROTO((void));

/* Functions called with no arguments at the beginning and end or processing
   the input source file.  */
extern void lang_init				PROTO((void));
extern void lang_finish				PROTO((void));

/* Function to identify which front-end produced the output file. */
extern char *lang_identify			PROTO((void));

/* Function to replace the DECL_LANG_SPECIFIC field of a DECL with a copy.  */
extern void copy_lang_decl			PROTO((tree));

/* Function called with no arguments to parse and compile the input.  */
extern int yyparse				PROTO((void));
/* 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			PROTO((char *));

/* 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				PROTO((int));
/* 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				PROTO((int, int, int));
/* Set the BLOCK node for the current scope level.  */
extern void set_block				PROTO((tree));
/* 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				PROTO((tree));
/* Function to return the chain of decls so far in the current scope level.  */
extern tree getdecls				PROTO((void));
/* Function to return the chain of structure tags in the current scope level.  */
extern tree gettags				PROTO((void));

extern tree build_range_type PROTO((tree, tree, tree));

/* Call when starting to parse a declaration:
   make expressions in the declaration last the length of the function.
   Returns an argument that should be passed to resume_momentary later.  */
extern int suspend_momentary PROTO((void));

extern int allocation_temporary_p PROTO((void));

/* Call when finished parsing a declaration:
   restore the treatment of node-allocation that was
   in effect before the suspension.
   YES should be the value previously returned by suspend_momentary.  */
extern void resume_momentary PROTO((int));

/* Called after finishing a record, union or enumeral type.  */
extern void rest_of_type_compilation PROTO((tree, int));

/* Save the current set of obstacks, but don't change them.  */
extern void push_obstacks_nochange PROTO((void));

extern void permanent_allocation PROTO((int));

extern void push_momentary PROTO((void));

extern void clear_momentary PROTO((void));

extern void pop_momentary PROTO((void));

extern void end_temporary_allocation PROTO((void));

/* Pop the obstack selection stack.  */
extern void pop_obstacks PROTO((void));