Daily bump.
[official-gcc.git] / gcc / function.h
blob6e7f53907c98fc6897363667f431e366df803b6a
1 /* Structure for saving state for a nested function.
2 Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 #ifndef GCC_FUNCTION_H
23 #define GCC_FUNCTION_H
25 #include "tree.h"
26 #include "hashtab.h"
27 #include "vecprim.h"
28 #include "tm.h" /* For CUMULATIVE_ARGS. */
29 #include "hard-reg-set.h"
31 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
32 Each element describes one pending sequence.
33 The main insn-chain is saved in the last element of the chain,
34 unless the chain is empty. */
36 struct GTY(()) sequence_stack {
37 /* First and last insns in the chain of the saved sequence. */
38 rtx first;
39 rtx last;
40 struct sequence_stack *next;
43 struct GTY(()) emit_status {
44 /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
45 After rtl generation, it is 1 plus the largest register number used. */
46 int x_reg_rtx_no;
48 /* Lowest label number in current function. */
49 int x_first_label_num;
51 /* The ends of the doubly-linked chain of rtl for the current function.
52 Both are reset to null at the start of rtl generation for the function.
54 start_sequence saves both of these on `sequence_stack' and then starts
55 a new, nested sequence of insns. */
56 rtx x_first_insn;
57 rtx x_last_insn;
59 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
60 Each element describes one pending sequence.
61 The main insn-chain is saved in the last element of the chain,
62 unless the chain is empty. */
63 struct sequence_stack *sequence_stack;
65 /* INSN_UID for next insn emitted.
66 Reset to 1 for each function compiled. */
67 int x_cur_insn_uid;
69 /* INSN_UID for next debug insn emitted. Only used if
70 --param min-nondebug-insn-uid=<value> is given with nonzero value. */
71 int x_cur_debug_insn_uid;
73 /* Location the last line-number NOTE emitted.
74 This is used to avoid generating duplicates. */
75 location_t x_last_location;
77 /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
78 vectors. Since these vectors are needed during the expansion phase when
79 the total number of registers in the function is not yet known, the
80 vectors are copied and made bigger when necessary. */
81 int regno_pointer_align_length;
83 /* Indexed by pseudo register number, if nonzero gives the known alignment
84 for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
85 Allocated in parallel with x_regno_reg_rtx. */
86 unsigned char * GTY((skip)) regno_pointer_align;
90 /* Indexed by pseudo register number, gives the rtx for that pseudo.
91 Allocated in parallel with regno_pointer_align.
92 FIXME: We could put it into emit_status struct, but gengtype is not able to deal
93 with length attribute nested in top level structures. */
95 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx * regno_reg_rtx;
97 /* For backward compatibility... eventually these should all go away. */
98 #define reg_rtx_no (crtl->emit.x_reg_rtx_no)
99 #define seq_stack (crtl->emit.sequence_stack)
101 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
103 struct GTY(()) expr_status {
104 /* Number of units that we should eventually pop off the stack.
105 These are the arguments to function calls that have already returned. */
106 int x_pending_stack_adjust;
108 /* Under some ABIs, it is the caller's responsibility to pop arguments
109 pushed for function calls. A naive implementation would simply pop
110 the arguments immediately after each call. However, if several
111 function calls are made in a row, it is typically cheaper to pop
112 all the arguments after all of the calls are complete since a
113 single pop instruction can be used. Therefore, GCC attempts to
114 defer popping the arguments until absolutely necessary. (For
115 example, at the end of a conditional, the arguments must be popped,
116 since code outside the conditional won't know whether or not the
117 arguments need to be popped.)
119 When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
120 attempt to defer pops. Instead, the stack is popped immediately
121 after each call. Rather then setting this variable directly, use
122 NO_DEFER_POP and OK_DEFER_POP. */
123 int x_inhibit_defer_pop;
125 /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
126 boundary can be momentarily unaligned while pushing the arguments.
127 Record the delta since last aligned boundary here in order to get
128 stack alignment in the nested function calls working right. */
129 int x_stack_pointer_delta;
131 /* Nonzero means __builtin_saveregs has already been done in this function.
132 The value is the pseudoreg containing the value __builtin_saveregs
133 returned. */
134 rtx x_saveregs_value;
136 /* Similarly for __builtin_apply_args. */
137 rtx x_apply_args_value;
139 /* List of labels that must never be deleted. */
140 rtx x_forced_labels;
143 typedef struct call_site_record_d *call_site_record;
144 DEF_VEC_P(call_site_record);
145 DEF_VEC_ALLOC_P(call_site_record, gc);
147 /* RTL representation of exception handling. */
148 struct GTY(()) rtl_eh {
149 rtx ehr_stackadj;
150 rtx ehr_handler;
151 rtx ehr_label;
153 rtx sjlj_fc;
154 rtx sjlj_exit_after;
156 VEC(uchar,gc) *action_record_data;
158 VEC(call_site_record,gc) *call_site_record[2];
161 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
162 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
163 #define saveregs_value (crtl->expr.x_saveregs_value)
164 #define apply_args_value (crtl->expr.x_apply_args_value)
165 #define forced_labels (crtl->expr.x_forced_labels)
166 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
168 struct gimple_df;
169 struct temp_slot;
170 typedef struct temp_slot *temp_slot_p;
171 struct call_site_record_d;
173 DEF_VEC_P(temp_slot_p);
174 DEF_VEC_ALLOC_P(temp_slot_p,gc);
175 struct ipa_opt_pass_d;
176 typedef struct ipa_opt_pass_d *ipa_opt_pass;
178 DEF_VEC_P(ipa_opt_pass);
179 DEF_VEC_ALLOC_P(ipa_opt_pass,heap);
181 struct GTY(()) varasm_status {
182 /* If we're using a per-function constant pool, this is it. */
183 struct rtx_constant_pool *pool;
185 /* Number of tree-constants deferred during the expansion of this
186 function. */
187 unsigned int deferred_constants;
190 /* Information mainlined about RTL representation of incoming arguments. */
191 struct GTY(()) incoming_args {
192 /* Number of bytes of args popped by function being compiled on its return.
193 Zero if no bytes are to be popped.
194 May affect compilation of return insn or of function epilogue. */
195 int pops_args;
197 /* If function's args have a fixed size, this is that size, in bytes.
198 Otherwise, it is -1.
199 May affect compilation of return insn or of function epilogue. */
200 int size;
202 /* # bytes the prologue should push and pretend that the caller pushed them.
203 The prologue must do this, but only if parms can be passed in
204 registers. */
205 int pretend_args_size;
207 /* This is the offset from the arg pointer to the place where the first
208 anonymous arg can be found, if there is one. */
209 rtx arg_offset_rtx;
211 /* Quantities of various kinds of registers
212 used for the current function's args. */
213 CUMULATIVE_ARGS info;
215 /* The arg pointer hard register, or the pseudo into which it was copied. */
216 rtx internal_arg_pointer;
219 /* Data for function partitioning. */
220 struct GTY(()) function_subsections {
221 /* Assembly labels for the hot and cold text sections, to
222 be used by debugger functions for determining the size of text
223 sections. */
225 const char *hot_section_label;
226 const char *cold_section_label;
227 const char *hot_section_end_label;
228 const char *cold_section_end_label;
231 /* Describe an empty area of space in the stack frame. These can be chained
232 into a list; this is used to keep track of space wasted for alignment
233 reasons. */
234 struct GTY(()) frame_space
236 struct frame_space *next;
238 HOST_WIDE_INT start;
239 HOST_WIDE_INT length;
242 /* Datastructures maintained for currently processed function in RTL form. */
243 struct GTY(()) rtl_data {
244 struct expr_status expr;
245 struct emit_status emit;
246 struct varasm_status varasm;
247 struct incoming_args args;
248 struct function_subsections subsections;
249 struct rtl_eh eh;
251 /* For function.c */
253 /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is
254 defined, the needed space is pushed by the prologue. */
255 int outgoing_args_size;
257 /* If nonzero, an RTL expression for the location at which the current
258 function returns its result. If the current function returns its
259 result in a register, current_function_return_rtx will always be
260 the hard register containing the result. */
261 rtx return_rtx;
263 /* Opaque pointer used by get_hard_reg_initial_val and
264 has_hard_reg_initial_val (see integrate.[hc]). */
265 struct initial_value_struct *hard_reg_initial_vals;
267 /* A variable living at the top of the frame that holds a known value.
268 Used for detecting stack clobbers. */
269 tree stack_protect_guard;
271 /* List (chain of EXPR_LIST) of labels heading the current handlers for
272 nonlocal gotos. */
273 rtx x_nonlocal_goto_handler_labels;
275 /* Label that will go on function epilogue.
276 Jumping to this label serves as a "return" instruction
277 on machines which require execution of the epilogue on all returns. */
278 rtx x_return_label;
280 /* Label that will go on the end of function epilogue.
281 Jumping to this label serves as a "naked return" instruction
282 on machines which require execution of the epilogue on all returns. */
283 rtx x_naked_return_label;
285 /* List (chain of EXPR_LISTs) of all stack slots in this function.
286 Made for the sake of unshare_all_rtl. */
287 rtx x_stack_slot_list;
289 /* List of empty areas in the stack frame. */
290 struct frame_space *frame_space_list;
292 /* Place after which to insert the tail_recursion_label if we need one. */
293 rtx x_stack_check_probe_note;
295 /* Location at which to save the argument pointer if it will need to be
296 referenced. There are two cases where this is done: if nonlocal gotos
297 exist, or if vars stored at an offset from the argument pointer will be
298 needed by inner routines. */
299 rtx x_arg_pointer_save_area;
301 /* Dynamic Realign Argument Pointer used for realigning stack. */
302 rtx drap_reg;
304 /* Offset to end of allocated area of stack frame.
305 If stack grows down, this is the address of the last stack slot allocated.
306 If stack grows up, this is the address for the next slot. */
307 HOST_WIDE_INT x_frame_offset;
309 /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */
310 rtx x_parm_birth_insn;
312 /* List of all used temporaries allocated, by level. */
313 VEC(temp_slot_p,gc) *x_used_temp_slots;
315 /* List of available temp slots. */
316 struct temp_slot *x_avail_temp_slots;
318 /* Current nesting level for temporaries. */
319 int x_temp_slot_level;
321 /* The largest alignment needed on the stack, including requirement
322 for outgoing stack alignment. */
323 unsigned int stack_alignment_needed;
325 /* Preferred alignment of the end of stack frame, which is preferred
326 to call other functions. */
327 unsigned int preferred_stack_boundary;
329 /* The minimum alignment of parameter stack. */
330 unsigned int parm_stack_boundary;
332 /* The largest alignment of slot allocated on the stack. */
333 unsigned int max_used_stack_slot_alignment;
335 /* The stack alignment estimated before reload, with consideration of
336 following factors:
337 1. Alignment of local stack variables (max_used_stack_slot_alignment)
338 2. Alignment requirement to call other functions
339 (preferred_stack_boundary)
340 3. Alignment of non-local stack variables but might be spilled in
341 local stack. */
342 unsigned int stack_alignment_estimated;
344 /* For reorg. */
346 /* If some insns can be deferred to the delay slots of the epilogue, the
347 delay list for them is recorded here. */
348 rtx epilogue_delay_list;
350 /* Nonzero if function being compiled called builtin_return_addr or
351 builtin_frame_address with nonzero count. */
352 bool accesses_prior_frames;
354 /* Nonzero if the function calls __builtin_eh_return. */
355 bool calls_eh_return;
357 /* Nonzero if function saves all registers, e.g. if it has a nonlocal
358 label that can reach the exit block via non-exceptional paths. */
359 bool saves_all_registers;
361 /* Nonzero if function being compiled has nonlocal gotos to parent
362 function. */
363 bool has_nonlocal_goto;
365 /* Nonzero if function being compiled has an asm statement. */
366 bool has_asm_statement;
368 /* This bit is used by the exception handling logic. It is set if all
369 calls (if any) are sibling calls. Such functions do not have to
370 have EH tables generated, as they cannot throw. A call to such a
371 function, however, should be treated as throwing if any of its callees
372 can throw. */
373 bool all_throwers_are_sibcalls;
375 /* Nonzero if stack limit checking should be enabled in the current
376 function. */
377 bool limit_stack;
379 /* Nonzero if profiling code should be generated. */
380 bool profile;
382 /* Nonzero if the current function uses the constant pool. */
383 bool uses_const_pool;
385 /* Nonzero if the current function uses pic_offset_table_rtx. */
386 bool uses_pic_offset_table;
388 /* Nonzero if the current function needs an lsda for exception handling. */
389 bool uses_eh_lsda;
391 /* Set when the tail call has been produced. */
392 bool tail_call_emit;
394 /* Nonzero if code to initialize arg_pointer_save_area has been emitted. */
395 bool arg_pointer_save_area_init;
397 /* Nonzero if current function must be given a frame pointer.
398 Set in global.c if anything is allocated on the stack there. */
399 bool frame_pointer_needed;
401 /* When set, expand should optimize for speed. */
402 bool maybe_hot_insn_p;
404 /* Nonzero if function stack realignment is needed. This flag may be
405 set twice: before and after reload. It is set before reload wrt
406 stack alignment estimation before reload. It will be changed after
407 reload if by then criteria of stack realignment is different.
408 The value set after reload is the accurate one and is finalized. */
409 bool stack_realign_needed;
411 /* Nonzero if function stack realignment is tried. This flag is set
412 only once before reload. It affects register elimination. This
413 is used to generate DWARF debug info for stack variables. */
414 bool stack_realign_tried;
416 /* Nonzero if function being compiled needs dynamic realigned
417 argument pointer (drap) if stack needs realigning. */
418 bool need_drap;
420 /* Nonzero if function stack realignment estimation is done, namely
421 stack_realign_needed flag has been set before reload wrt estimated
422 stack alignment info. */
423 bool stack_realign_processed;
425 /* Nonzero if function stack realignment has been finalized, namely
426 stack_realign_needed flag has been set and finalized after reload. */
427 bool stack_realign_finalized;
429 /* True if dbr_schedule has already been called for this function. */
430 bool dbr_scheduled_p;
432 /* True if current function can not throw. Unlike
433 TREE_NOTHROW (current_function_decl) it is set even for overwritable
434 function where currently compiled version of it is nothrow. */
435 bool nothrow;
437 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
438 asm. Unlike regs_ever_live, elements of this array corresponding
439 to eliminable regs (like the frame pointer) are set if an asm
440 sets them. */
441 HARD_REG_SET asm_clobbers;
444 #define return_label (crtl->x_return_label)
445 #define naked_return_label (crtl->x_naked_return_label)
446 #define stack_slot_list (crtl->x_stack_slot_list)
447 #define parm_birth_insn (crtl->x_parm_birth_insn)
448 #define frame_offset (crtl->x_frame_offset)
449 #define stack_check_probe_note (crtl->x_stack_check_probe_note)
450 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
451 #define used_temp_slots (crtl->x_used_temp_slots)
452 #define avail_temp_slots (crtl->x_avail_temp_slots)
453 #define temp_slot_level (crtl->x_temp_slot_level)
454 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
455 #define frame_pointer_needed (crtl->frame_pointer_needed)
456 #define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
457 #define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
459 extern GTY(()) struct rtl_data x_rtl;
461 /* Accessor to RTL datastructures. We keep them statically allocated now since
462 we never keep multiple functions. For threaded compiler we might however
463 want to do differently. */
464 #define crtl (&x_rtl)
466 struct GTY(()) stack_usage
468 /* # of bytes of static stack space allocated by the function. */
469 HOST_WIDE_INT static_stack_size;
471 /* # of bytes of dynamic stack space allocated by the function. This is
472 meaningful only if has_unbounded_dynamic_stack_size is zero. */
473 HOST_WIDE_INT dynamic_stack_size;
475 /* # of bytes of space pushed onto the stack after the prologue. If
476 !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments. */
477 int pushed_stack_size;
479 /* # of dynamic allocations in the function. */
480 unsigned int dynamic_alloc_count : 31;
482 /* Nonzero if the amount of stack space allocated dynamically cannot
483 be bounded at compile-time. */
484 unsigned int has_unbounded_dynamic_stack_size : 1;
487 #define current_function_static_stack_size (cfun->su->static_stack_size)
488 #define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size)
489 #define current_function_pushed_stack_size (cfun->su->pushed_stack_size)
490 #define current_function_dynamic_alloc_count (cfun->su->dynamic_alloc_count)
491 #define current_function_has_unbounded_dynamic_stack_size \
492 (cfun->su->has_unbounded_dynamic_stack_size)
493 #define current_function_allocates_dynamic_stack_space \
494 (current_function_dynamic_stack_size != 0 \
495 || current_function_has_unbounded_dynamic_stack_size)
497 /* This structure can save all the important global and static variables
498 describing the status of the current function. */
500 struct GTY(()) function {
501 struct eh_status *eh;
503 /* The control flow graph for this function. */
504 struct control_flow_graph *cfg;
506 /* GIMPLE body for this function. */
507 struct gimple_seq_d *gimple_body;
509 /* SSA and dataflow information. */
510 struct gimple_df *gimple_df;
512 /* The loops in this function. */
513 struct loops *x_current_loops;
515 /* The stack usage of this function. */
516 struct stack_usage *su;
518 /* Value histograms attached to particular statements. */
519 htab_t GTY((skip)) value_histograms;
521 /* For function.c. */
523 /* Points to the FUNCTION_DECL of this function. */
524 tree decl;
526 /* A PARM_DECL that should contain the static chain for this function.
527 It will be initialized at the beginning of the function. */
528 tree static_chain_decl;
530 /* An expression that contains the non-local goto save area. The first
531 word is the saved frame pointer and the second is the saved stack
532 pointer. */
533 tree nonlocal_goto_save_area;
535 /* Vector of function local variables, functions, types and constants. */
536 VEC(tree,gc) *local_decls;
538 /* For md files. */
540 /* tm.h can use this to store whatever it likes. */
541 struct machine_function * GTY ((maybe_undef)) machine;
543 /* Language-specific code can use this to store whatever it likes. */
544 struct language_function * language;
546 /* Used types hash table. */
547 htab_t GTY ((param_is (union tree_node))) used_types_hash;
549 /* Last statement uid. */
550 int last_stmt_uid;
552 /* Function sequence number for profiling, debugging, etc. */
553 int funcdef_no;
555 /* Line number of the start of the function for debugging purposes. */
556 location_t function_start_locus;
558 /* Line number of the end of the function. */
559 location_t function_end_locus;
561 /* Properties used by the pass manager. */
562 unsigned int curr_properties;
563 unsigned int last_verified;
565 /* Non-null if the function does something that would prevent it from
566 being copied; this applies to both versioning and inlining. Set to
567 a string describing the reason for failure. */
568 const char * GTY((skip)) cannot_be_copied_reason;
570 /* Collected bit flags. */
572 /* Number of units of general registers that need saving in stdarg
573 function. What unit is depends on the backend, either it is number
574 of bytes, or it can be number of registers. */
575 unsigned int va_list_gpr_size : 8;
577 /* Number of units of floating point registers that need saving in stdarg
578 function. */
579 unsigned int va_list_fpr_size : 8;
581 /* Nonzero if function being compiled can call setjmp. */
582 unsigned int calls_setjmp : 1;
584 /* Nonzero if function being compiled can call alloca,
585 either as a subroutine or builtin. */
586 unsigned int calls_alloca : 1;
588 /* Nonzero if function being compiled receives nonlocal gotos
589 from nested functions. */
590 unsigned int has_nonlocal_label : 1;
592 /* Nonzero if we've set cannot_be_copied_reason. I.e. if
593 (cannot_be_copied_set && !cannot_be_copied_reason), the function
594 can in fact be copied. */
595 unsigned int cannot_be_copied_set : 1;
597 /* Nonzero if current function uses stdarg.h or equivalent. */
598 unsigned int stdarg : 1;
600 /* Nonzero if the back-end should not keep track of expressions that
601 determine the size of variable-sized objects. Normally, such
602 expressions are saved away, and then expanded when the next
603 function is started. For example, if a parameter has a
604 variable-sized type, then the size of the parameter is computed
605 when the function body is entered. However, some front-ends do
606 not desire this behavior. */
607 unsigned int dont_save_pending_sizes_p : 1;
609 unsigned int after_inlining : 1;
610 unsigned int always_inline_functions_inlined : 1;
612 /* Nonzero if function being compiled can throw synchronous non-call
613 exceptions. */
614 unsigned int can_throw_non_call_exceptions : 1;
616 /* Fields below this point are not set for abstract functions; see
617 allocate_struct_function. */
619 /* Nonzero if function being compiled needs to be given an address
620 where the value should be stored. */
621 unsigned int returns_struct : 1;
623 /* Nonzero if function being compiled needs to
624 return the address of where it has put a structure value. */
625 unsigned int returns_pcc_struct : 1;
627 /* Nonzero if pass_tree_profile was run on this function. */
628 unsigned int after_tree_profile : 1;
630 /* Nonzero if this function has local DECL_HARD_REGISTER variables.
631 In this case code motion has to be done more carefully. */
632 unsigned int has_local_explicit_reg_vars : 1;
634 /* Nonzero if the current function is a thunk, i.e., a lightweight
635 function implemented by the output_mi_thunk hook) that just
636 adjusts one of its arguments and forwards to another
637 function. */
638 unsigned int is_thunk : 1;
641 /* Add the decl D to the local_decls list of FUN. */
643 static inline void
644 add_local_decl (struct function *fun, tree d)
646 VEC_safe_push (tree, gc, fun->local_decls, d);
649 #define FOR_EACH_LOCAL_DECL(FUN, I, D) \
650 FOR_EACH_VEC_ELT_REVERSE (tree, (FUN)->local_decls, I, D)
652 /* If va_list_[gf]pr_size is set to this, it means we don't know how
653 many units need to be saved. */
654 #define VA_LIST_MAX_GPR_SIZE 255
655 #define VA_LIST_MAX_FPR_SIZE 255
657 /* The function currently being compiled. */
658 extern GTY(()) struct function *cfun;
660 /* In order to ensure that cfun is not set directly, we redefine it so
661 that it is not an lvalue. Rather than assign to cfun, use
662 push_cfun or set_cfun. */
663 #define cfun (cfun + 0)
665 /* Nonzero if we've already converted virtual regs to hard regs. */
666 extern int virtuals_instantiated;
668 /* Nonzero if at least one trampoline has been created. */
669 extern int trampolines_created;
671 struct GTY(()) types_used_by_vars_entry {
672 tree type;
673 tree var_decl;
676 /* Hash table making the relationship between a global variable
677 and the types it references in its initializer. The key of the
678 entry is a referenced type, and the value is the DECL of the global
679 variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
680 the hash and equality functions to use for this hash table. */
681 extern GTY((param_is (struct types_used_by_vars_entry))) htab_t
682 types_used_by_vars_hash;
684 hashval_t types_used_by_vars_do_hash (const void*);
685 int types_used_by_vars_eq (const void *, const void *);
686 void types_used_by_var_decl_insert (tree type, tree var_decl);
688 /* During parsing of a global variable, this vector contains the types
689 referenced by the global variable. */
690 extern GTY(()) VEC(tree,gc) *types_used_by_cur_var_decl;
693 /* cfun shouldn't be set directly; use one of these functions instead. */
694 extern void set_cfun (struct function *new_cfun);
695 extern void push_cfun (struct function *new_cfun);
696 extern void pop_cfun (void);
697 extern void instantiate_decl_rtl (rtx x);
699 /* For backward compatibility... eventually these should all go away. */
700 #define current_function_funcdef_no (cfun->funcdef_no)
702 #define current_loops (cfun->x_current_loops)
703 #define dom_computed (cfun->cfg->x_dom_computed)
704 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
705 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
707 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
708 and create duplicate blocks. */
709 extern void reorder_blocks (void);
711 /* Set BLOCK_NUMBER for all the blocks in FN. */
712 extern void number_blocks (tree);
714 extern void clear_block_marks (tree);
715 extern tree blocks_nreverse (tree);
717 /* Return size needed for stack frame based on slots so far allocated.
718 This size counts from zero. It is not rounded to STACK_BOUNDARY;
719 the caller may have to do that. */
720 extern HOST_WIDE_INT get_frame_size (void);
722 /* Issue an error message and return TRUE if frame OFFSET overflows in
723 the signed target pointer arithmetics for function FUNC. Otherwise
724 return FALSE. */
725 extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
727 /* A pointer to a function to create target specific, per-function
728 data structures. */
729 extern struct machine_function * (*init_machine_status) (void);
731 /* Save and restore status information for a nested function. */
732 extern void free_after_parsing (struct function *);
733 extern void free_after_compilation (struct function *);
735 extern void init_varasm_status (void);
737 #ifdef RTX_CODE
738 extern void diddle_return_value (void (*)(rtx, void*), void*);
739 extern void clobber_return_register (void);
740 #endif
742 extern rtx get_arg_pointer_save_area (void);
744 /* Returns the name of the current function. */
745 extern const char *current_function_name (void);
747 extern void do_warn_unused_parameter (tree);
749 extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
750 tree, bool);
751 extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
752 tree, bool);
754 extern void used_types_insert (tree);
756 extern int get_next_funcdef_no (void);
758 /* In predict.c */
759 extern bool optimize_function_for_size_p (struct function *);
760 extern bool optimize_function_for_speed_p (struct function *);
762 #endif /* GCC_FUNCTION_H */