tree.h

GCC编译器源代码

extern tree sizetype;

/* If nonzero, an upper limit on alignment of structure fields, in bits. */
extern int maximum_field_alignment;

/* If non-zero, the alignment of a bitstring or (power-)set value, in bits. */
extern int set_alignment;

/* 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			PROTO((tree, tree));

/* Make a new TREE_LIST node from specified PURPOSE, VALUE and CHAIN.  */

extern tree tree_cons			PROTO((tree, tree, tree));
extern tree perm_tree_cons		PROTO((tree, tree, tree));
extern tree temp_tree_cons		PROTO((tree, tree, tree));
extern tree saveable_tree_cons		PROTO((tree, tree, tree));
extern tree decl_tree_cons		PROTO((tree, tree, tree));
extern tree expr_tree_cons		PROTO((tree, tree, tree));

/* Return the last tree node in a chain.  */

extern tree tree_last			PROTO((tree));

/* Reverse the order of elements in a chain, and return the new head.  */

extern tree nreverse			PROTO((tree));

/* Returns the length of a chain of nodes
   (number of chain pointers to follow before reaching a null pointer).  */

extern int list_length			PROTO((tree));

/* integer_zerop (tree x) is nonzero if X is an integer constant of value 0 */

extern int integer_zerop		PROTO((tree));

/* integer_onep (tree x) is nonzero if X is an integer constant of value 1 */

extern int integer_onep			PROTO((tree));

/* 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		PROTO((tree));

/* integer_pow2p (tree x) is nonzero is X is an integer constant with
   exactly one bit 1.  */

extern int integer_pow2p		PROTO((tree));

/* staticp (tree x) is nonzero if X is a reference to data allocated
   at a fixed address in memory.  */

extern int staticp			PROTO((tree));

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

/* 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			PROTO((tree));

/* unsave_expr (EXP) returns an expression equivalent to EXP but it
   can be used multiple times and will evaluate EXP, in it's entirety
   each time.  */

extern tree unsave_expr			PROTO((tree));

/* unsave_expr_now (EXP) resets EXP in place, so that it can be
   expanded again.  */

extern tree unsave_expr_now		PROTO((tree));

/* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
   or offset that depends on a field within a record.

   Note that we only allow such expressions within simple arithmetic
   or a COND_EXPR.  */

extern int contains_placeholder_p	PROTO((tree));

/* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
   return a tree with all occurrences of references to F in a
   PLACEHOLDER_EXPR replaced by R.   Note that we assume here that EXP
   contains only arithmetic expressions.  */

extern tree substitute_in_expr		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 *, 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.
   DECL is the declaration in question.
   VERBOSITY determines what information will be printed:
     0: DECL_NAME, demangled as necessary.
     1: and scope information.
     2: and any other information that might be interesting, such as function
        parameter types in C++.  */

extern char *(*decl_printable_name) (/* tree decl, int verbosity */);

/* 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_file_function_name		PROTO((int));
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 void start_cleanup_deferral		PROTO((void));
extern void end_cleanup_deferral		PROTO((void));
extern void mark_block_as_eh_region		PROTO((void));
extern void mark_block_as_not_eh_region		PROTO((void));
extern int is_eh_region				PROTO((void));
extern int conditional_context			PROTO((void));
extern tree last_cleanup_this_contour		PROTO((void));
extern int expand_dhc_cleanup			PROTO((tree));
extern int expand_dcc_cleanup			PROTO((tree));
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,
				       HOS