1 /* Structure for saving state for a nested function.
2 Copyright (C) 1989-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 #ifndef GCC_FUNCTION_H
21 #define GCC_FUNCTION_H
26 #include "tm.h" /* For CUMULATIVE_ARGS. */
27 #include "hard-reg-set.h" /* For HARD_REG_SET in struct rtl_data. */
28 #include "input.h" /* For location_t. */
30 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
31 Each element describes one pending sequence.
32 The main insn-chain is saved in the last element of the chain,
33 unless the chain is empty. */
35 struct GTY(()) sequence_stack
{
36 /* First and last insns in the chain of the saved sequence. */
39 struct sequence_stack
*next
;
42 struct GTY(()) emit_status
{
43 /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
44 After rtl generation, it is 1 plus the largest register number used. */
47 /* Lowest label number in current function. */
48 int x_first_label_num
;
50 /* The ends of the doubly-linked chain of rtl for the current function.
51 Both are reset to null at the start of rtl generation for the function.
53 start_sequence saves both of these on `sequence_stack' and then starts
54 a new, nested sequence of insns. */
58 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
59 Each element describes one pending sequence.
60 The main insn-chain is saved in the last element of the chain,
61 unless the chain is empty. */
62 struct sequence_stack
*sequence_stack
;
64 /* INSN_UID for next insn emitted.
65 Reset to 1 for each function compiled. */
68 /* INSN_UID for next debug insn emitted. Only used if
69 --param min-nondebug-insn-uid=<value> is given with nonzero value. */
70 int x_cur_debug_insn_uid
;
72 /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
73 vectors. Since these vectors are needed during the expansion phase when
74 the total number of registers in the function is not yet known, the
75 vectors are copied and made bigger when necessary. */
76 int regno_pointer_align_length
;
78 /* Indexed by pseudo register number, if nonzero gives the known alignment
79 for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
80 Allocated in parallel with x_regno_reg_rtx. */
81 unsigned char * GTY((skip
)) regno_pointer_align
;
85 /* Indexed by register number, gives an rtx for that register (and only
86 that register). For pseudo registers, it is the unique rtx for
87 that pseudo. For hard registers, it is an rtx of the mode specified
90 FIXME: We could put it into emit_status struct, but gengtype is not
91 able to deal with length attribute nested in top level structures. */
93 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx
* regno_reg_rtx
;
95 /* For backward compatibility... eventually these should all go away. */
96 #define reg_rtx_no (crtl->emit.x_reg_rtx_no)
97 #define seq_stack (crtl->emit.sequence_stack)
99 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
101 struct GTY(()) expr_status
{
102 /* Number of units that we should eventually pop off the stack.
103 These are the arguments to function calls that have already returned. */
104 int x_pending_stack_adjust
;
106 /* Under some ABIs, it is the caller's responsibility to pop arguments
107 pushed for function calls. A naive implementation would simply pop
108 the arguments immediately after each call. However, if several
109 function calls are made in a row, it is typically cheaper to pop
110 all the arguments after all of the calls are complete since a
111 single pop instruction can be used. Therefore, GCC attempts to
112 defer popping the arguments until absolutely necessary. (For
113 example, at the end of a conditional, the arguments must be popped,
114 since code outside the conditional won't know whether or not the
115 arguments need to be popped.)
117 When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
118 attempt to defer pops. Instead, the stack is popped immediately
119 after each call. Rather then setting this variable directly, use
120 NO_DEFER_POP and OK_DEFER_POP. */
121 int x_inhibit_defer_pop
;
123 /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
124 boundary can be momentarily unaligned while pushing the arguments.
125 Record the delta since last aligned boundary here in order to get
126 stack alignment in the nested function calls working right. */
127 int x_stack_pointer_delta
;
129 /* Nonzero means __builtin_saveregs has already been done in this function.
130 The value is the pseudoreg containing the value __builtin_saveregs
132 rtx x_saveregs_value
;
134 /* Similarly for __builtin_apply_args. */
135 rtx x_apply_args_value
;
137 /* List of labels that must never be deleted. */
141 typedef struct call_site_record_d
*call_site_record
;
143 /* RTL representation of exception handling. */
144 struct GTY(()) rtl_eh
{
152 vec
<uchar
, va_gc
> *action_record_data
;
154 vec
<call_site_record
, va_gc
> *call_site_record_v
[2];
157 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
158 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
159 #define saveregs_value (crtl->expr.x_saveregs_value)
160 #define apply_args_value (crtl->expr.x_apply_args_value)
161 #define forced_labels (crtl->expr.x_forced_labels)
162 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
166 typedef struct temp_slot
*temp_slot_p
;
167 struct call_site_record_d
;
168 struct dw_fde_struct
;
170 struct ipa_opt_pass_d
;
171 typedef struct ipa_opt_pass_d
*ipa_opt_pass
;
174 struct GTY(()) varasm_status
{
175 /* If we're using a per-function constant pool, this is it. */
176 struct rtx_constant_pool
*pool
;
178 /* Number of tree-constants deferred during the expansion of this
180 unsigned int deferred_constants
;
183 /* Information mainlined about RTL representation of incoming arguments. */
184 struct GTY(()) incoming_args
{
185 /* Number of bytes of args popped by function being compiled on its return.
186 Zero if no bytes are to be popped.
187 May affect compilation of return insn or of function epilogue. */
190 /* If function's args have a fixed size, this is that size, in bytes.
192 May affect compilation of return insn or of function epilogue. */
195 /* # bytes the prologue should push and pretend that the caller pushed them.
196 The prologue must do this, but only if parms can be passed in
198 int pretend_args_size
;
200 /* This is the offset from the arg pointer to the place where the first
201 anonymous arg can be found, if there is one. */
204 /* Quantities of various kinds of registers
205 used for the current function's args. */
206 CUMULATIVE_ARGS info
;
208 /* The arg pointer hard register, or the pseudo into which it was copied. */
209 rtx internal_arg_pointer
;
212 /* Data for function partitioning. */
213 struct GTY(()) function_subsections
{
214 /* Assembly labels for the hot and cold text sections, to
215 be used by debugger functions for determining the size of text
218 const char *hot_section_label
;
219 const char *cold_section_label
;
220 const char *hot_section_end_label
;
221 const char *cold_section_end_label
;
224 /* Describe an empty area of space in the stack frame. These can be chained
225 into a list; this is used to keep track of space wasted for alignment
227 struct GTY(()) frame_space
229 struct frame_space
*next
;
232 HOST_WIDE_INT length
;
235 /* Datastructures maintained for currently processed function in RTL form. */
236 struct GTY(()) rtl_data
{
237 struct expr_status expr
;
238 struct emit_status emit
;
239 struct varasm_status varasm
;
240 struct incoming_args args
;
241 struct function_subsections subsections
;
246 /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is
247 defined, the needed space is pushed by the prologue. */
248 int outgoing_args_size
;
250 /* If nonzero, an RTL expression for the location at which the current
251 function returns its result. If the current function returns its
252 result in a register, current_function_return_rtx will always be
253 the hard register containing the result. */
256 /* Vector of initial-value pairs. Each pair consists of a pseudo
257 register of approprite mode that stores the initial value a hard
258 register REGNO, and that hard register itself. */
259 /* ??? This could be a VEC but there is currently no way to define an
261 struct initial_value_struct
*hard_reg_initial_vals
;
263 /* A variable living at the top of the frame that holds a known value.
264 Used for detecting stack clobbers. */
265 tree stack_protect_guard
;
267 /* List (chain of EXPR_LIST) of labels heading the current handlers for
269 rtx x_nonlocal_goto_handler_labels
;
271 /* Label that will go on function epilogue.
272 Jumping to this label serves as a "return" instruction
273 on machines which require execution of the epilogue on all returns. */
276 /* Label that will go on the end of function epilogue.
277 Jumping to this label serves as a "naked return" instruction
278 on machines which require execution of the epilogue on all returns. */
279 rtx x_naked_return_label
;
281 /* List (chain of EXPR_LISTs) of all stack slots in this function.
282 Made for the sake of unshare_all_rtl. */
283 rtx x_stack_slot_list
;
285 /* List of empty areas in the stack frame. */
286 struct frame_space
*frame_space_list
;
288 /* Place after which to insert the tail_recursion_label if we need one. */
289 rtx x_stack_check_probe_note
;
291 /* Location at which to save the argument pointer if it will need to be
292 referenced. There are two cases where this is done: if nonlocal gotos
293 exist, or if vars stored at an offset from the argument pointer will be
294 needed by inner routines. */
295 rtx x_arg_pointer_save_area
;
297 /* Dynamic Realign Argument Pointer used for realigning stack. */
300 /* Offset to end of allocated area of stack frame.
301 If stack grows down, this is the address of the last stack slot allocated.
302 If stack grows up, this is the address for the next slot. */
303 HOST_WIDE_INT x_frame_offset
;
305 /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */
306 rtx x_parm_birth_insn
;
308 /* List of all used temporaries allocated, by level. */
309 vec
<temp_slot_p
, va_gc
> *x_used_temp_slots
;
311 /* List of available temp slots. */
312 struct temp_slot
*x_avail_temp_slots
;
314 /* Current nesting level for temporaries. */
315 int x_temp_slot_level
;
317 /* The largest alignment needed on the stack, including requirement
318 for outgoing stack alignment. */
319 unsigned int stack_alignment_needed
;
321 /* Preferred alignment of the end of stack frame, which is preferred
322 to call other functions. */
323 unsigned int preferred_stack_boundary
;
325 /* The minimum alignment of parameter stack. */
326 unsigned int parm_stack_boundary
;
328 /* The largest alignment of slot allocated on the stack. */
329 unsigned int max_used_stack_slot_alignment
;
331 /* The stack alignment estimated before reload, with consideration of
333 1. Alignment of local stack variables (max_used_stack_slot_alignment)
334 2. Alignment requirement to call other functions
335 (preferred_stack_boundary)
336 3. Alignment of non-local stack variables but might be spilled in
338 unsigned int stack_alignment_estimated
;
342 /* Nonzero if function being compiled called builtin_return_addr or
343 builtin_frame_address with nonzero count. */
344 bool accesses_prior_frames
;
346 /* Nonzero if the function calls __builtin_eh_return. */
347 bool calls_eh_return
;
349 /* Nonzero if function saves all registers, e.g. if it has a nonlocal
350 label that can reach the exit block via non-exceptional paths. */
351 bool saves_all_registers
;
353 /* Nonzero if function being compiled has nonlocal gotos to parent
355 bool has_nonlocal_goto
;
357 /* Nonzero if function being compiled has an asm statement. */
358 bool has_asm_statement
;
360 /* This bit is used by the exception handling logic. It is set if all
361 calls (if any) are sibling calls. Such functions do not have to
362 have EH tables generated, as they cannot throw. A call to such a
363 function, however, should be treated as throwing if any of its callees
365 bool all_throwers_are_sibcalls
;
367 /* Nonzero if stack limit checking should be enabled in the current
371 /* Nonzero if profiling code should be generated. */
374 /* Nonzero if the current function uses the constant pool. */
375 bool uses_const_pool
;
377 /* Nonzero if the current function uses pic_offset_table_rtx. */
378 bool uses_pic_offset_table
;
380 /* Nonzero if the current function needs an lsda for exception handling. */
383 /* Set when the tail call has been produced. */
386 /* Nonzero if code to initialize arg_pointer_save_area has been emitted. */
387 bool arg_pointer_save_area_init
;
389 /* Nonzero if current function must be given a frame pointer.
390 Set in reload1.c or lra-eliminations.c if anything is allocated
391 on the stack there. */
392 bool frame_pointer_needed
;
394 /* When set, expand should optimize for speed. */
395 bool maybe_hot_insn_p
;
397 /* Nonzero if function stack realignment is needed. This flag may be
398 set twice: before and after reload. It is set before reload wrt
399 stack alignment estimation before reload. It will be changed after
400 reload if by then criteria of stack realignment is different.
401 The value set after reload is the accurate one and is finalized. */
402 bool stack_realign_needed
;
404 /* Nonzero if function stack realignment is tried. This flag is set
405 only once before reload. It affects register elimination. This
406 is used to generate DWARF debug info for stack variables. */
407 bool stack_realign_tried
;
409 /* Nonzero if function being compiled needs dynamic realigned
410 argument pointer (drap) if stack needs realigning. */
413 /* Nonzero if function stack realignment estimation is done, namely
414 stack_realign_needed flag has been set before reload wrt estimated
415 stack alignment info. */
416 bool stack_realign_processed
;
418 /* Nonzero if function stack realignment has been finalized, namely
419 stack_realign_needed flag has been set and finalized after reload. */
420 bool stack_realign_finalized
;
422 /* True if dbr_schedule has already been called for this function. */
423 bool dbr_scheduled_p
;
425 /* True if current function can not throw. Unlike
426 TREE_NOTHROW (current_function_decl) it is set even for overwritable
427 function where currently compiled version of it is nothrow. */
430 /* True if we performed shrink-wrapping for the current function. */
433 /* Nonzero if function being compiled doesn't modify the stack pointer
434 (ignoring the prologue and epilogue). This is only valid after
435 pass_stack_ptr_mod has run. */
436 bool sp_is_unchanging
;
438 /* Nonzero if function being compiled doesn't contain any calls
439 (ignoring the prologue and epilogue). This is set prior to
440 local register allocation and is valid for the remaining
444 /* Nonzero if the function being compiled is a leaf function which only
445 uses leaf registers. This is valid after reload (specifically after
446 sched2) and is useful only if the port defines LEAF_REGISTERS. */
447 bool uses_only_leaf_regs
;
449 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
450 asm. Unlike regs_ever_live, elements of this array corresponding
451 to eliminable regs (like the frame pointer) are set if an asm
453 HARD_REG_SET asm_clobbers
;
456 #define return_label (crtl->x_return_label)
457 #define naked_return_label (crtl->x_naked_return_label)
458 #define stack_slot_list (crtl->x_stack_slot_list)
459 #define parm_birth_insn (crtl->x_parm_birth_insn)
460 #define frame_offset (crtl->x_frame_offset)
461 #define stack_check_probe_note (crtl->x_stack_check_probe_note)
462 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
463 #define used_temp_slots (crtl->x_used_temp_slots)
464 #define avail_temp_slots (crtl->x_avail_temp_slots)
465 #define temp_slot_level (crtl->x_temp_slot_level)
466 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
467 #define frame_pointer_needed (crtl->frame_pointer_needed)
468 #define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
469 #define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
471 extern GTY(()) struct rtl_data x_rtl
;
473 /* Accessor to RTL datastructures. We keep them statically allocated now since
474 we never keep multiple functions. For threaded compiler we might however
475 want to do differently. */
476 #define crtl (&x_rtl)
478 struct GTY(()) stack_usage
480 /* # of bytes of static stack space allocated by the function. */
481 HOST_WIDE_INT static_stack_size
;
483 /* # of bytes of dynamic stack space allocated by the function. This is
484 meaningful only if has_unbounded_dynamic_stack_size is zero. */
485 HOST_WIDE_INT dynamic_stack_size
;
487 /* # of bytes of space pushed onto the stack after the prologue. If
488 !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments. */
489 int pushed_stack_size
;
491 /* Nonzero if the amount of stack space allocated dynamically cannot
492 be bounded at compile-time. */
493 unsigned int has_unbounded_dynamic_stack_size
: 1;
496 #define current_function_static_stack_size (cfun->su->static_stack_size)
497 #define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size)
498 #define current_function_pushed_stack_size (cfun->su->pushed_stack_size)
499 #define current_function_has_unbounded_dynamic_stack_size \
500 (cfun->su->has_unbounded_dynamic_stack_size)
501 #define current_function_allocates_dynamic_stack_space \
502 (current_function_dynamic_stack_size != 0 \
503 || current_function_has_unbounded_dynamic_stack_size)
505 /* This structure can save all the important global and static variables
506 describing the status of the current function. */
508 struct GTY(()) function
{
509 struct eh_status
*eh
;
511 /* The control flow graph for this function. */
512 struct control_flow_graph
*cfg
;
514 /* GIMPLE body for this function. */
515 gimple_seq gimple_body
;
517 /* SSA and dataflow information. */
518 struct gimple_df
*gimple_df
;
520 /* The loops in this function. */
521 struct loops
*x_current_loops
;
523 /* The stack usage of this function. */
524 struct stack_usage
*su
;
526 /* Value histograms attached to particular statements. */
527 htab_t
GTY((skip
)) value_histograms
;
529 /* For function.c. */
531 /* Points to the FUNCTION_DECL of this function. */
534 /* A PARM_DECL that should contain the static chain for this function.
535 It will be initialized at the beginning of the function. */
536 tree static_chain_decl
;
538 /* An expression that contains the non-local goto save area. The first
539 word is the saved frame pointer and the second is the saved stack
541 tree nonlocal_goto_save_area
;
543 /* Vector of function local variables, functions, types and constants. */
544 vec
<tree
, va_gc
> *local_decls
;
548 /* tm.h can use this to store whatever it likes. */
549 struct machine_function
* GTY ((maybe_undef
)) machine
;
551 /* Language-specific code can use this to store whatever it likes. */
552 struct language_function
* language
;
554 /* Used types hash table. */
555 htab_t
GTY ((param_is (union tree_node
))) used_types_hash
;
557 /* Dwarf2 Frame Description Entry, containing the Call Frame Instructions
558 used for unwinding. Only set when either dwarf2 unwinding or dwarf2
559 debugging is enabled. */
560 struct dw_fde_struct
*fde
;
562 /* Last statement uid. */
565 /* Function sequence number for profiling, debugging, etc. */
568 /* Line number of the start of the function for debugging purposes. */
569 location_t function_start_locus
;
571 /* Line number of the end of the function. */
572 location_t function_end_locus
;
574 /* Properties used by the pass manager. */
575 unsigned int curr_properties
;
576 unsigned int last_verified
;
578 /* Non-null if the function does something that would prevent it from
579 being copied; this applies to both versioning and inlining. Set to
580 a string describing the reason for failure. */
581 const char * GTY((skip
)) cannot_be_copied_reason
;
583 /* Collected bit flags. */
585 /* Number of units of general registers that need saving in stdarg
586 function. What unit is depends on the backend, either it is number
587 of bytes, or it can be number of registers. */
588 unsigned int va_list_gpr_size
: 8;
590 /* Number of units of floating point registers that need saving in stdarg
592 unsigned int va_list_fpr_size
: 8;
594 /* Nonzero if function being compiled can call setjmp. */
595 unsigned int calls_setjmp
: 1;
597 /* Nonzero if function being compiled can call alloca,
598 either as a subroutine or builtin. */
599 unsigned int calls_alloca
: 1;
601 /* Nonzero if function being compiled receives nonlocal gotos
602 from nested functions. */
603 unsigned int has_nonlocal_label
: 1;
605 /* Nonzero if we've set cannot_be_copied_reason. I.e. if
606 (cannot_be_copied_set && !cannot_be_copied_reason), the function
607 can in fact be copied. */
608 unsigned int cannot_be_copied_set
: 1;
610 /* Nonzero if current function uses stdarg.h or equivalent. */
611 unsigned int stdarg
: 1;
613 unsigned int after_inlining
: 1;
614 unsigned int always_inline_functions_inlined
: 1;
616 /* Nonzero if function being compiled can throw synchronous non-call
618 unsigned int can_throw_non_call_exceptions
: 1;
620 /* Nonzero if instructions that may throw exceptions but don't otherwise
621 contribute to the execution of the program can be deleted. */
622 unsigned int can_delete_dead_exceptions
: 1;
624 /* Fields below this point are not set for abstract functions; see
625 allocate_struct_function. */
627 /* Nonzero if function being compiled needs to be given an address
628 where the value should be stored. */
629 unsigned int returns_struct
: 1;
631 /* Nonzero if function being compiled needs to
632 return the address of where it has put a structure value. */
633 unsigned int returns_pcc_struct
: 1;
635 /* Nonzero if this function has local DECL_HARD_REGISTER variables.
636 In this case code motion has to be done more carefully. */
637 unsigned int has_local_explicit_reg_vars
: 1;
639 /* Nonzero if the current function is a thunk, i.e., a lightweight
640 function implemented by the output_mi_thunk hook) that just
641 adjusts one of its arguments and forwards to another
643 unsigned int is_thunk
: 1;
646 /* Add the decl D to the local_decls list of FUN. */
649 add_local_decl (struct function
*fun
, tree d
)
651 vec_safe_push (fun
->local_decls
, d
);
654 #define FOR_EACH_LOCAL_DECL(FUN, I, D) \
655 FOR_EACH_VEC_SAFE_ELT_REVERSE ((FUN)->local_decls, I, D)
657 /* If va_list_[gf]pr_size is set to this, it means we don't know how
658 many units need to be saved. */
659 #define VA_LIST_MAX_GPR_SIZE 255
660 #define VA_LIST_MAX_FPR_SIZE 255
662 /* The function currently being compiled. */
663 extern GTY(()) struct function
*cfun
;
665 /* In order to ensure that cfun is not set directly, we redefine it so
666 that it is not an lvalue. Rather than assign to cfun, use
667 push_cfun or set_cfun. */
668 #define cfun (cfun + 0)
670 /* Nonzero if we've already converted virtual regs to hard regs. */
671 extern int virtuals_instantiated
;
673 /* Nonzero if at least one trampoline has been created. */
674 extern int trampolines_created
;
676 struct GTY(()) types_used_by_vars_entry
{
681 /* Hash table making the relationship between a global variable
682 and the types it references in its initializer. The key of the
683 entry is a referenced type, and the value is the DECL of the global
684 variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
685 the hash and equality functions to use for this hash table. */
686 extern GTY((param_is (struct types_used_by_vars_entry
))) htab_t
687 types_used_by_vars_hash
;
689 hashval_t
types_used_by_vars_do_hash (const void*);
690 int types_used_by_vars_eq (const void *, const void *);
691 void types_used_by_var_decl_insert (tree type
, tree var_decl
);
693 /* During parsing of a global variable, this vector contains the types
694 referenced by the global variable. */
695 extern GTY(()) vec
<tree
, va_gc
> *types_used_by_cur_var_decl
;
697 /* cfun shouldn't be set directly; use one of these functions instead. */
698 extern void set_cfun (struct function
*new_cfun
);
699 extern void push_cfun (struct function
*new_cfun
);
700 extern void pop_cfun (void);
701 extern void instantiate_decl_rtl (rtx x
);
703 /* For backward compatibility... eventually these should all go away. */
704 #define current_function_funcdef_no (cfun->funcdef_no)
706 #define current_loops (cfun->x_current_loops)
707 #define dom_computed (cfun->cfg->x_dom_computed)
708 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
709 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
711 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
712 and create duplicate blocks. */
713 extern void reorder_blocks (void);
715 /* Set BLOCK_NUMBER for all the blocks in FN. */
716 extern void number_blocks (tree
);
718 extern void clear_block_marks (tree
);
719 extern tree
blocks_nreverse (tree
);
720 extern tree
block_chainon (tree
, tree
);
722 /* Return size needed for stack frame based on slots so far allocated.
723 This size counts from zero. It is not rounded to STACK_BOUNDARY;
724 the caller may have to do that. */
725 extern HOST_WIDE_INT
get_frame_size (void);
727 /* Issue an error message and return TRUE if frame OFFSET overflows in
728 the signed target pointer arithmetics for function FUNC. Otherwise
730 extern bool frame_offset_overflow (HOST_WIDE_INT
, tree
);
732 /* A pointer to a function to create target specific, per-function
734 extern struct machine_function
* (*init_machine_status
) (void);
736 /* Save and restore status information for a nested function. */
737 extern void free_after_parsing (struct function
*);
738 extern void free_after_compilation (struct function
*);
740 extern void init_varasm_status (void);
743 extern void diddle_return_value (void (*)(rtx
, void*), void*);
744 extern void clobber_return_register (void);
747 extern rtx
get_arg_pointer_save_area (void);
749 /* Returns the name of the current function. */
750 extern const char *fndecl_name (tree
);
751 extern const char *function_name (struct function
*);
752 extern const char *current_function_name (void);
754 extern void do_warn_unused_parameter (tree
);
756 extern bool pass_by_reference (CUMULATIVE_ARGS
*, enum machine_mode
,
758 extern bool reference_callee_copied (CUMULATIVE_ARGS
*, enum machine_mode
,
761 extern void used_types_insert (tree
);
763 extern int get_next_funcdef_no (void);
764 extern int get_last_funcdef_no (void);
766 #ifdef HAVE_simple_return
767 extern bool requires_stack_frame_p (rtx
, HARD_REG_SET
, HARD_REG_SET
);
770 extern rtx
get_hard_reg_initial_val (enum machine_mode
, unsigned int);
771 extern rtx
has_hard_reg_initial_val (enum machine_mode
, unsigned int);
772 extern rtx
get_hard_reg_initial_reg (rtx
);
773 extern bool initial_value_entry (int i
, rtx
*, rtx
*);
775 /* Called from gimple_expand_cfg. */
776 extern unsigned int emit_initial_value_sets (void);
779 extern bool optimize_function_for_size_p (struct function
*);
780 extern bool optimize_function_for_speed_p (struct function
*);
782 #endif /* GCC_FUNCTION_H */