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, 2011
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
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
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
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. */
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. */
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. */
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. */
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 /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
74 vectors. Since these vectors are needed during the expansion phase when
75 the total number of registers in the function is not yet known, the
76 vectors are copied and made bigger when necessary. */
77 int regno_pointer_align_length
;
79 /* Indexed by pseudo register number, if nonzero gives the known alignment
80 for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
81 Allocated in parallel with x_regno_reg_rtx. */
82 unsigned char * GTY((skip
)) regno_pointer_align
;
86 /* Indexed by register number, gives an rtx for that register (and only
87 that register). For pseudo registers, it is the unique rtx for
88 that pseudo. For hard registers, it is an rtx of the mode specified
91 FIXME: We could put it into emit_status struct, but gengtype is not
92 able to deal with length attribute nested in top level structures. */
94 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx
* regno_reg_rtx
;
96 /* For backward compatibility... eventually these should all go away. */
97 #define reg_rtx_no (crtl->emit.x_reg_rtx_no)
98 #define seq_stack (crtl->emit.sequence_stack)
100 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
102 struct GTY(()) expr_status
{
103 /* Number of units that we should eventually pop off the stack.
104 These are the arguments to function calls that have already returned. */
105 int x_pending_stack_adjust
;
107 /* Under some ABIs, it is the caller's responsibility to pop arguments
108 pushed for function calls. A naive implementation would simply pop
109 the arguments immediately after each call. However, if several
110 function calls are made in a row, it is typically cheaper to pop
111 all the arguments after all of the calls are complete since a
112 single pop instruction can be used. Therefore, GCC attempts to
113 defer popping the arguments until absolutely necessary. (For
114 example, at the end of a conditional, the arguments must be popped,
115 since code outside the conditional won't know whether or not the
116 arguments need to be popped.)
118 When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
119 attempt to defer pops. Instead, the stack is popped immediately
120 after each call. Rather then setting this variable directly, use
121 NO_DEFER_POP and OK_DEFER_POP. */
122 int x_inhibit_defer_pop
;
124 /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
125 boundary can be momentarily unaligned while pushing the arguments.
126 Record the delta since last aligned boundary here in order to get
127 stack alignment in the nested function calls working right. */
128 int x_stack_pointer_delta
;
130 /* Nonzero means __builtin_saveregs has already been done in this function.
131 The value is the pseudoreg containing the value __builtin_saveregs
133 rtx x_saveregs_value
;
135 /* Similarly for __builtin_apply_args. */
136 rtx x_apply_args_value
;
138 /* List of labels that must never be deleted. */
142 typedef struct call_site_record_d
*call_site_record
;
143 DEF_VEC_P(call_site_record
);
144 DEF_VEC_ALLOC_P(call_site_record
, gc
);
146 /* RTL representation of exception handling. */
147 struct GTY(()) rtl_eh
{
155 VEC(uchar
,gc
) *action_record_data
;
157 VEC(call_site_record
,gc
) *call_site_record
[2];
160 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
161 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
162 #define saveregs_value (crtl->expr.x_saveregs_value)
163 #define apply_args_value (crtl->expr.x_apply_args_value)
164 #define forced_labels (crtl->expr.x_forced_labels)
165 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
169 typedef struct temp_slot
*temp_slot_p
;
170 struct call_site_record_d
;
171 struct dw_fde_struct
;
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
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. */
197 /* If function's args have a fixed size, this is that size, in bytes.
199 May affect compilation of return insn or of function epilogue. */
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
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. */
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
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
234 struct GTY(()) frame_space
236 struct frame_space
*next
;
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
;
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. */
263 /* Vector of initial-value pairs. Each pair consists of a pseudo
264 register of approprite mode that stores the initial value a hard
265 register REGNO, and that hard register itself. */
266 /* ??? This could be a VEC but there is currently no way to define an
268 struct initial_value_struct
*hard_reg_initial_vals
;
270 /* A variable living at the top of the frame that holds a known value.
271 Used for detecting stack clobbers. */
272 tree stack_protect_guard
;
274 /* List (chain of EXPR_LIST) of labels heading the current handlers for
276 rtx x_nonlocal_goto_handler_labels
;
278 /* Label that will go on function epilogue.
279 Jumping to this label serves as a "return" instruction
280 on machines which require execution of the epilogue on all returns. */
283 /* Label that will go on the end of function epilogue.
284 Jumping to this label serves as a "naked return" instruction
285 on machines which require execution of the epilogue on all returns. */
286 rtx x_naked_return_label
;
288 /* List (chain of EXPR_LISTs) of all stack slots in this function.
289 Made for the sake of unshare_all_rtl. */
290 rtx x_stack_slot_list
;
292 /* List of empty areas in the stack frame. */
293 struct frame_space
*frame_space_list
;
295 /* Place after which to insert the tail_recursion_label if we need one. */
296 rtx x_stack_check_probe_note
;
298 /* Location at which to save the argument pointer if it will need to be
299 referenced. There are two cases where this is done: if nonlocal gotos
300 exist, or if vars stored at an offset from the argument pointer will be
301 needed by inner routines. */
302 rtx x_arg_pointer_save_area
;
304 /* Dynamic Realign Argument Pointer used for realigning stack. */
307 /* Offset to end of allocated area of stack frame.
308 If stack grows down, this is the address of the last stack slot allocated.
309 If stack grows up, this is the address for the next slot. */
310 HOST_WIDE_INT x_frame_offset
;
312 /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */
313 rtx x_parm_birth_insn
;
315 /* List of all used temporaries allocated, by level. */
316 VEC(temp_slot_p
,gc
) *x_used_temp_slots
;
318 /* List of available temp slots. */
319 struct temp_slot
*x_avail_temp_slots
;
321 /* Current nesting level for temporaries. */
322 int x_temp_slot_level
;
324 /* The largest alignment needed on the stack, including requirement
325 for outgoing stack alignment. */
326 unsigned int stack_alignment_needed
;
328 /* Preferred alignment of the end of stack frame, which is preferred
329 to call other functions. */
330 unsigned int preferred_stack_boundary
;
332 /* The minimum alignment of parameter stack. */
333 unsigned int parm_stack_boundary
;
335 /* The largest alignment of slot allocated on the stack. */
336 unsigned int max_used_stack_slot_alignment
;
338 /* The stack alignment estimated before reload, with consideration of
340 1. Alignment of local stack variables (max_used_stack_slot_alignment)
341 2. Alignment requirement to call other functions
342 (preferred_stack_boundary)
343 3. Alignment of non-local stack variables but might be spilled in
345 unsigned int stack_alignment_estimated
;
349 /* If some insns can be deferred to the delay slots of the epilogue, the
350 delay list for them is recorded here. */
351 rtx epilogue_delay_list
;
353 /* Nonzero if function being compiled called builtin_return_addr or
354 builtin_frame_address with nonzero count. */
355 bool accesses_prior_frames
;
357 /* Nonzero if the function calls __builtin_eh_return. */
358 bool calls_eh_return
;
360 /* Nonzero if function saves all registers, e.g. if it has a nonlocal
361 label that can reach the exit block via non-exceptional paths. */
362 bool saves_all_registers
;
364 /* Nonzero if function being compiled has nonlocal gotos to parent
366 bool has_nonlocal_goto
;
368 /* Nonzero if function being compiled has an asm statement. */
369 bool has_asm_statement
;
371 /* This bit is used by the exception handling logic. It is set if all
372 calls (if any) are sibling calls. Such functions do not have to
373 have EH tables generated, as they cannot throw. A call to such a
374 function, however, should be treated as throwing if any of its callees
376 bool all_throwers_are_sibcalls
;
378 /* Nonzero if stack limit checking should be enabled in the current
382 /* Nonzero if profiling code should be generated. */
385 /* Nonzero if the current function uses the constant pool. */
386 bool uses_const_pool
;
388 /* Nonzero if the current function uses pic_offset_table_rtx. */
389 bool uses_pic_offset_table
;
391 /* Nonzero if the current function needs an lsda for exception handling. */
394 /* Set when the tail call has been produced. */
397 /* Nonzero if code to initialize arg_pointer_save_area has been emitted. */
398 bool arg_pointer_save_area_init
;
400 /* Nonzero if current function must be given a frame pointer.
401 Set in global.c if anything is allocated on the stack there. */
402 bool frame_pointer_needed
;
404 /* When set, expand should optimize for speed. */
405 bool maybe_hot_insn_p
;
407 /* Nonzero if function stack realignment is needed. This flag may be
408 set twice: before and after reload. It is set before reload wrt
409 stack alignment estimation before reload. It will be changed after
410 reload if by then criteria of stack realignment is different.
411 The value set after reload is the accurate one and is finalized. */
412 bool stack_realign_needed
;
414 /* Nonzero if function stack realignment is tried. This flag is set
415 only once before reload. It affects register elimination. This
416 is used to generate DWARF debug info for stack variables. */
417 bool stack_realign_tried
;
419 /* Nonzero if function being compiled needs dynamic realigned
420 argument pointer (drap) if stack needs realigning. */
423 /* Nonzero if function stack realignment estimation is done, namely
424 stack_realign_needed flag has been set before reload wrt estimated
425 stack alignment info. */
426 bool stack_realign_processed
;
428 /* Nonzero if function stack realignment has been finalized, namely
429 stack_realign_needed flag has been set and finalized after reload. */
430 bool stack_realign_finalized
;
432 /* True if dbr_schedule has already been called for this function. */
433 bool dbr_scheduled_p
;
435 /* True if current function can not throw. Unlike
436 TREE_NOTHROW (current_function_decl) it is set even for overwritable
437 function where currently compiled version of it is nothrow. */
440 /* True if we performed shrink-wrapping for the current function. */
443 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
444 asm. Unlike regs_ever_live, elements of this array corresponding
445 to eliminable regs (like the frame pointer) are set if an asm
447 HARD_REG_SET asm_clobbers
;
450 #define return_label (crtl->x_return_label)
451 #define naked_return_label (crtl->x_naked_return_label)
452 #define stack_slot_list (crtl->x_stack_slot_list)
453 #define parm_birth_insn (crtl->x_parm_birth_insn)
454 #define frame_offset (crtl->x_frame_offset)
455 #define stack_check_probe_note (crtl->x_stack_check_probe_note)
456 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
457 #define used_temp_slots (crtl->x_used_temp_slots)
458 #define avail_temp_slots (crtl->x_avail_temp_slots)
459 #define temp_slot_level (crtl->x_temp_slot_level)
460 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
461 #define frame_pointer_needed (crtl->frame_pointer_needed)
462 #define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
463 #define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
465 extern GTY(()) struct rtl_data x_rtl
;
467 /* Accessor to RTL datastructures. We keep them statically allocated now since
468 we never keep multiple functions. For threaded compiler we might however
469 want to do differently. */
470 #define crtl (&x_rtl)
472 struct GTY(()) stack_usage
474 /* # of bytes of static stack space allocated by the function. */
475 HOST_WIDE_INT static_stack_size
;
477 /* # of bytes of dynamic stack space allocated by the function. This is
478 meaningful only if has_unbounded_dynamic_stack_size is zero. */
479 HOST_WIDE_INT dynamic_stack_size
;
481 /* # of bytes of space pushed onto the stack after the prologue. If
482 !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments. */
483 int pushed_stack_size
;
485 /* Nonzero if the amount of stack space allocated dynamically cannot
486 be bounded at compile-time. */
487 unsigned int has_unbounded_dynamic_stack_size
: 1;
490 #define current_function_static_stack_size (cfun->su->static_stack_size)
491 #define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size)
492 #define current_function_pushed_stack_size (cfun->su->pushed_stack_size)
493 #define current_function_has_unbounded_dynamic_stack_size \
494 (cfun->su->has_unbounded_dynamic_stack_size)
495 #define current_function_allocates_dynamic_stack_space \
496 (current_function_dynamic_stack_size != 0 \
497 || current_function_has_unbounded_dynamic_stack_size)
499 /* This structure can save all the important global and static variables
500 describing the status of the current function. */
502 struct GTY(()) function
{
503 struct eh_status
*eh
;
505 /* The control flow graph for this function. */
506 struct control_flow_graph
*cfg
;
508 /* GIMPLE body for this function. */
509 gimple_seq gimple_body
;
511 /* SSA and dataflow information. */
512 struct gimple_df
*gimple_df
;
514 /* The loops in this function. */
515 struct loops
*x_current_loops
;
517 /* The stack usage of this function. */
518 struct stack_usage
*su
;
520 /* Value histograms attached to particular statements. */
521 htab_t
GTY((skip
)) value_histograms
;
523 /* For function.c. */
525 /* Points to the FUNCTION_DECL of this function. */
528 /* A PARM_DECL that should contain the static chain for this function.
529 It will be initialized at the beginning of the function. */
530 tree static_chain_decl
;
532 /* An expression that contains the non-local goto save area. The first
533 word is the saved frame pointer and the second is the saved stack
535 tree nonlocal_goto_save_area
;
537 /* Vector of function local variables, functions, types and constants. */
538 VEC(tree
,gc
) *local_decls
;
542 /* tm.h can use this to store whatever it likes. */
543 struct machine_function
* GTY ((maybe_undef
)) machine
;
545 /* Language-specific code can use this to store whatever it likes. */
546 struct language_function
* language
;
548 /* Used types hash table. */
549 htab_t
GTY ((param_is (union tree_node
))) used_types_hash
;
551 /* Dwarf2 Frame Description Entry, containing the Call Frame Instructions
552 used for unwinding. Only set when either dwarf2 unwinding or dwarf2
553 debugging is enabled. */
554 struct dw_fde_struct
*fde
;
556 /* Last statement uid. */
559 /* Function sequence number for profiling, debugging, etc. */
562 /* Line number of the start of the function for debugging purposes. */
563 location_t function_start_locus
;
565 /* Line number of the end of the function. */
566 location_t function_end_locus
;
568 /* Properties used by the pass manager. */
569 unsigned int curr_properties
;
570 unsigned int last_verified
;
572 /* Non-null if the function does something that would prevent it from
573 being copied; this applies to both versioning and inlining. Set to
574 a string describing the reason for failure. */
575 const char * GTY((skip
)) cannot_be_copied_reason
;
577 /* Collected bit flags. */
579 /* Number of units of general registers that need saving in stdarg
580 function. What unit is depends on the backend, either it is number
581 of bytes, or it can be number of registers. */
582 unsigned int va_list_gpr_size
: 8;
584 /* Number of units of floating point registers that need saving in stdarg
586 unsigned int va_list_fpr_size
: 8;
588 /* Nonzero if function being compiled can call setjmp. */
589 unsigned int calls_setjmp
: 1;
591 /* Nonzero if function being compiled can call alloca,
592 either as a subroutine or builtin. */
593 unsigned int calls_alloca
: 1;
595 /* Nonzero if function being compiled receives nonlocal gotos
596 from nested functions. */
597 unsigned int has_nonlocal_label
: 1;
599 /* Nonzero if we've set cannot_be_copied_reason. I.e. if
600 (cannot_be_copied_set && !cannot_be_copied_reason), the function
601 can in fact be copied. */
602 unsigned int cannot_be_copied_set
: 1;
604 /* Nonzero if current function uses stdarg.h or equivalent. */
605 unsigned int stdarg
: 1;
607 unsigned int after_inlining
: 1;
608 unsigned int always_inline_functions_inlined
: 1;
610 /* Nonzero if function being compiled can throw synchronous non-call
612 unsigned int can_throw_non_call_exceptions
: 1;
614 /* Nonzero if instructions that may throw exceptions but don't otherwise
615 contribute to the execution of the program can be deleted. */
616 unsigned int can_delete_dead_exceptions
: 1;
618 /* Fields below this point are not set for abstract functions; see
619 allocate_struct_function. */
621 /* Nonzero if function being compiled needs to be given an address
622 where the value should be stored. */
623 unsigned int returns_struct
: 1;
625 /* Nonzero if function being compiled needs to
626 return the address of where it has put a structure value. */
627 unsigned int returns_pcc_struct
: 1;
629 /* Nonzero if pass_tree_profile was run on this function. */
630 unsigned int after_tree_profile
: 1;
632 /* Nonzero if this function has local DECL_HARD_REGISTER variables.
633 In this case code motion has to be done more carefully. */
634 unsigned int has_local_explicit_reg_vars
: 1;
636 /* Nonzero if the current function is a thunk, i.e., a lightweight
637 function implemented by the output_mi_thunk hook) that just
638 adjusts one of its arguments and forwards to another
640 unsigned int is_thunk
: 1;
643 /* Add the decl D to the local_decls list of FUN. */
646 add_local_decl (struct function
*fun
, tree d
)
648 VEC_safe_push (tree
, gc
, fun
->local_decls
, d
);
651 #define FOR_EACH_LOCAL_DECL(FUN, I, D) \
652 FOR_EACH_VEC_ELT_REVERSE (tree, (FUN)->local_decls, I, D)
654 /* If va_list_[gf]pr_size is set to this, it means we don't know how
655 many units need to be saved. */
656 #define VA_LIST_MAX_GPR_SIZE 255
657 #define VA_LIST_MAX_FPR_SIZE 255
659 /* The function currently being compiled. */
660 extern GTY(()) struct function
*cfun
;
662 /* In order to ensure that cfun is not set directly, we redefine it so
663 that it is not an lvalue. Rather than assign to cfun, use
664 push_cfun or set_cfun. */
665 #define cfun (cfun + 0)
667 /* Nonzero if we've already converted virtual regs to hard regs. */
668 extern int virtuals_instantiated
;
670 /* Nonzero if at least one trampoline has been created. */
671 extern int trampolines_created
;
673 struct GTY(()) types_used_by_vars_entry
{
678 /* Hash table making the relationship between a global variable
679 and the types it references in its initializer. The key of the
680 entry is a referenced type, and the value is the DECL of the global
681 variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
682 the hash and equality functions to use for this hash table. */
683 extern GTY((param_is (struct types_used_by_vars_entry
))) htab_t
684 types_used_by_vars_hash
;
686 hashval_t
types_used_by_vars_do_hash (const void*);
687 int types_used_by_vars_eq (const void *, const void *);
688 void types_used_by_var_decl_insert (tree type
, tree var_decl
);
690 /* During parsing of a global variable, this vector contains the types
691 referenced by the global variable. */
692 extern GTY(()) VEC(tree
,gc
) *types_used_by_cur_var_decl
;
694 /* cfun shouldn't be set directly; use one of these functions instead. */
695 extern void set_cfun (struct function
*new_cfun
);
696 extern void push_cfun (struct function
*new_cfun
);
697 extern void pop_cfun (void);
698 extern void instantiate_decl_rtl (rtx x
);
700 /* For backward compatibility... eventually these should all go away. */
701 #define current_function_funcdef_no (cfun->funcdef_no)
703 #define current_loops (cfun->x_current_loops)
704 #define dom_computed (cfun->cfg->x_dom_computed)
705 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
706 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
708 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
709 and create duplicate blocks. */
710 extern void reorder_blocks (void);
712 /* Set BLOCK_NUMBER for all the blocks in FN. */
713 extern void number_blocks (tree
);
715 extern void clear_block_marks (tree
);
716 extern tree
blocks_nreverse (tree
);
717 extern tree
block_chainon (tree
, tree
);
719 /* Return size needed for stack frame based on slots so far allocated.
720 This size counts from zero. It is not rounded to STACK_BOUNDARY;
721 the caller may have to do that. */
722 extern HOST_WIDE_INT
get_frame_size (void);
724 /* Issue an error message and return TRUE if frame OFFSET overflows in
725 the signed target pointer arithmetics for function FUNC. Otherwise
727 extern bool frame_offset_overflow (HOST_WIDE_INT
, tree
);
729 /* A pointer to a function to create target specific, per-function
731 extern struct machine_function
* (*init_machine_status
) (void);
733 /* Save and restore status information for a nested function. */
734 extern void free_after_parsing (struct function
*);
735 extern void free_after_compilation (struct function
*);
737 extern void init_varasm_status (void);
740 extern void diddle_return_value (void (*)(rtx
, void*), void*);
741 extern void clobber_return_register (void);
744 extern rtx
get_arg_pointer_save_area (void);
746 /* Returns the name of the current function. */
747 extern const char *current_function_name (void);
749 extern void do_warn_unused_parameter (tree
);
751 extern bool pass_by_reference (CUMULATIVE_ARGS
*, enum machine_mode
,
753 extern bool reference_callee_copied (CUMULATIVE_ARGS
*, enum machine_mode
,
756 extern void used_types_insert (tree
);
758 extern int get_next_funcdef_no (void);
759 extern int get_last_funcdef_no (void);
761 #ifdef HAVE_simple_return
762 extern bool requires_stack_frame_p (rtx
, HARD_REG_SET
, HARD_REG_SET
);
765 extern rtx
get_hard_reg_initial_val (enum machine_mode
, unsigned int);
766 extern rtx
has_hard_reg_initial_val (enum machine_mode
, unsigned int);
767 extern rtx
get_hard_reg_initial_reg (rtx
);
768 extern bool initial_value_entry (int i
, rtx
*, rtx
*);
770 /* Called from gimple_expand_cfg. */
771 extern unsigned int emit_initial_value_sets (void);
774 extern bool optimize_function_for_size_p (struct function
*);
775 extern bool optimize_function_for_speed_p (struct function
*);
777 #endif /* GCC_FUNCTION_H */