1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output
;
103 extern tree last_assemble_variable_decl
;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN
;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree
);
127 static rtx
rest_of_handle_ssa (tree
, rtx
);
128 static void rest_of_handle_cse (tree
, rtx
);
129 static void rest_of_handle_cse2 (tree
, rtx
);
130 static void rest_of_handle_gcse (tree
, rtx
);
131 static void rest_of_handle_life (tree
, rtx
);
132 static void rest_of_handle_loop_optimize (tree
, rtx
);
133 static void rest_of_handle_loop2 (tree
, rtx
);
134 static void rest_of_handle_jump_bypass (tree
, rtx
);
135 static void rest_of_handle_sibling_calls (rtx
);
136 static void rest_of_handle_null_pointer (tree
, rtx
);
137 static void rest_of_handle_addressof (tree
, rtx
);
138 static void rest_of_handle_cfg (tree
, rtx
);
139 static void rest_of_handle_branch_prob (tree
, rtx
);
140 static void rest_of_handle_if_conversion (tree
, rtx
);
141 static void rest_of_handle_if_after_combine (tree
, rtx
);
142 static void rest_of_handle_tracer (tree
, rtx
);
143 static void rest_of_handle_combine (tree
, rtx
);
144 static void rest_of_handle_regmove (tree
, rtx
);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree
, rtx
);
147 static void rest_of_handle_sched2 (tree
, rtx
);
149 static bool rest_of_handle_new_regalloc (tree
, rtx
, int *);
150 static bool rest_of_handle_old_regalloc (tree
, rtx
, int *);
151 static void rest_of_handle_regrename (tree
, rtx
);
152 static void rest_of_handle_reorder_blocks (tree
, rtx
);
154 static void rest_of_handle_stack_regs (tree
, rtx
);
156 static void rest_of_handle_machine_reorg (tree
, rtx
);
158 static void rest_of_handle_delay_slots (tree
, rtx
);
160 static void rest_of_handle_final (tree
, rtx
);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug
;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend
;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname
;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv
;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename
;
184 /* Current position in real source file. */
186 location_t input_location
;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack
*input_file_stack
;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick
;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name
;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name
;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags
;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit
;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks
*debug_hooks
= &do_nothing_debug_hooks
;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension
;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch
;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p
;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
284 DFI_branch_target_load
,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file
[DFI_MAX
] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index
, tree
);
345 static void close_dump_file (enum dump_file_index
,
346 void (*) (FILE *, rtx
), rtx
);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit
;
351 int flag_print_asm_name
;
352 enum graph_dump_types graph_dump_format
;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name
;
358 /* Type(s) of debugging information we are producing (if any).
359 See flags.h for the definitions of the different possible
360 types of debugging information. */
361 enum debug_info_type write_symbols
= NO_DEBUG
;
363 /* Level of debugging information we are producing. See flags.h
364 for the definitions of the different possible levels. */
365 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
367 /* Nonzero means use GNU-only extensions in the generated symbolic
368 debugging information. */
369 /* Currently, this only has an effect when write_symbols is set to
370 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
371 int use_gnu_debug_info_extensions
= 0;
373 /* Nonzero means do optimizations. -O.
374 Particular numeric values stand for particular amounts of optimization;
375 thus, -O2 stores 2 here. However, the optimizations beyond the basic
376 ones are not controlled directly by this variable. Instead, they are
377 controlled by individual `flag_...' variables that are defaulted
378 based on this variable. */
382 /* Nonzero means optimize for size. -Os.
383 The only valid values are zero and nonzero. When optimize_size is
384 nonzero, optimize defaults to 2, but certain individual code
385 bloating optimizations are disabled. */
387 int optimize_size
= 0;
389 /* The FUNCTION_DECL for the function currently being compiled,
390 or 0 if between functions. */
391 tree current_function_decl
;
393 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
395 tree current_function_func_begin_label
;
397 /* Nonzero if doing dwarf2 duplicate elimination. */
399 int flag_eliminate_dwarf2_dups
= 0;
401 /* Nonzero if doing unused type elimination. */
403 int flag_eliminate_unused_debug_types
= 1;
405 /* Nonzero means emit debugging information only for symbols which are used. */
406 int flag_debug_only_used_symbols
= 0;
408 /* Nonzero if generating code to do profiling. */
410 int profile_flag
= 0;
412 /* Nonzero if generating code to profile program flow graph arcs. */
414 int profile_arc_flag
= 0;
416 /* Nonzero if value histograms should be measured. */
418 int flag_profile_values
= 0;
420 /* Nonzero if generating info for gcov to calculate line test coverage. */
422 int flag_test_coverage
= 0;
424 /* Nonzero indicates that branch taken probabilities should be calculated. */
426 int flag_branch_probabilities
= 0;
428 /* Nonzero if basic blocks should be reordered. */
430 int flag_reorder_blocks
= 0;
432 /* Nonzero if functions should be reordered. */
434 int flag_reorder_functions
= 0;
436 /* Nonzero if registers should be renamed. */
438 int flag_rename_registers
= 0;
439 int flag_cprop_registers
= 0;
441 /* Nonzero for -pedantic switch: warn about anything
442 that standard spec forbids. */
446 /* Temporarily suppress certain warnings.
447 This is set while reading code from a system header file. */
449 int in_system_header
= 0;
451 /* Don't print functions as they are compiled. -quiet. */
455 /* Print times taken by the various passes. -ftime-report. */
459 /* Print memory still in use at end of compilation (which may have little
460 to do with peak memory consumption). -fmem-report. */
464 /* Nonzero means to collect statistics which might be expensive
465 and to print them when we are done. */
466 int flag_detailed_statistics
= 0;
468 /* A random sequence of characters, unless overridden by user. */
469 const char *flag_random_seed
;
471 /* A local time stamp derived from the time of compilation. It will be
472 zero if the system cannot provide a time. It will be -1u, if the
473 user has specified a particular random seed. */
478 /* Nonzero means `char' should be signed. */
480 int flag_signed_char
;
482 /* Nonzero means give an enum type only as many bytes as it needs. */
484 int flag_short_enums
;
486 /* Nonzero for -fcaller-saves: allocate values in regs that need to
487 be saved across function calls, if that produces overall better code.
488 Optional now, so people can test it. */
490 #ifdef DEFAULT_CALLER_SAVES
491 int flag_caller_saves
= 1;
493 int flag_caller_saves
= 0;
496 /* Nonzero if structures and unions should be returned in memory.
498 This should only be defined if compatibility with another compiler or
499 with an ABI is needed, because it results in slower code. */
501 #ifndef DEFAULT_PCC_STRUCT_RETURN
502 #define DEFAULT_PCC_STRUCT_RETURN 1
505 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
507 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
509 /* Nonzero for -fforce-mem: load memory value into a register
510 before arithmetic on it. This makes better cse but slower compilation. */
512 int flag_force_mem
= 0;
514 /* Nonzero for -fforce-addr: load memory address into a register before
515 reference to memory. This makes better cse but slower compilation. */
517 int flag_force_addr
= 0;
519 /* Nonzero for -fdefer-pop: don't pop args after each function call;
520 instead save them up to pop many calls' args with one insns. */
522 int flag_defer_pop
= 0;
524 /* Nonzero for -ffloat-store: don't allocate floats and doubles
525 in extended-precision registers. */
527 int flag_float_store
= 0;
529 /* Nonzero for -fcse-follow-jumps:
530 have cse follow jumps to do a more extensive job. */
532 int flag_cse_follow_jumps
;
534 /* Nonzero for -fcse-skip-blocks:
535 have cse follow a branch around a block. */
536 int flag_cse_skip_blocks
;
538 /* Nonzero for -fexpensive-optimizations:
539 perform miscellaneous relatively-expensive optimizations. */
540 int flag_expensive_optimizations
;
542 /* Nonzero for -fthread-jumps:
543 have jump optimize output of loop. */
545 int flag_thread_jumps
;
547 /* Nonzero enables strength-reduction in loop.c. */
549 int flag_strength_reduce
= 0;
551 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
552 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
553 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
556 int flag_old_unroll_loops
;
558 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
559 This is generally not a win. */
561 int flag_old_unroll_all_loops
;
563 /* Enables unrolling of simple loops in loop-unroll.c. */
564 int flag_unroll_loops
;
566 /* Enables unrolling of all loops in loop-unroll.c. */
567 int flag_unroll_all_loops
;
569 /* Nonzero enables loop peeling. */
572 /* Nonzero enables loop unswitching. */
573 int flag_unswitch_loops
;
575 /* Nonzero enables prefetch optimizations for arrays in loops. */
577 int flag_prefetch_loop_arrays
;
579 /* Nonzero forces all invariant computations in loops to be moved
582 int flag_move_all_movables
= 0;
584 /* Nonzero forces all general induction variables in loops to be
587 int flag_reduce_all_givs
= 0;
589 /* Nonzero to perform full register move optimization passes. This is the
592 int flag_regmove
= 0;
594 /* Nonzero for -fwritable-strings:
595 store string constants in data segment and don't uniquize them. */
597 int flag_writable_strings
= 0;
599 /* Nonzero means don't put addresses of constant functions in registers.
600 Used for compiling the Unix kernel, where strange substitutions are
601 done on the assembly output. */
603 int flag_no_function_cse
= 0;
605 /* Nonzero for -fomit-frame-pointer:
606 don't make a frame pointer in simple functions that don't require one. */
608 int flag_omit_frame_pointer
= 0;
610 /* Nonzero means place each function into its own section on those platforms
611 which support arbitrary section names and unlimited numbers of sections. */
613 int flag_function_sections
= 0;
615 /* ... and similar for data. */
617 int flag_data_sections
= 0;
619 /* Nonzero to inhibit use of define_optimization peephole opts. */
621 int flag_no_peephole
= 0;
623 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
625 int flag_optimize_sibling_calls
= 0;
627 /* Nonzero means the front end generally wants `errno' maintained by math
628 operations, like built-in SQRT. */
630 int flag_errno_math
= 1;
632 /* Nonzero means that unsafe floating-point math optimizations are allowed
633 for the sake of speed. IEEE compliance is not guaranteed, and operations
634 are allowed to assume that their arguments and results are "normal"
635 (e.g., nonnegative for SQRT). */
637 int flag_unsafe_math_optimizations
= 0;
639 /* Nonzero means that no NaNs or +-Infs are expected. */
641 int flag_finite_math_only
= 0;
643 /* Zero means that floating-point math operations cannot generate a
644 (user-visible) trap. This is the case, for example, in nonstop
645 IEEE 754 arithmetic. Trapping conditions include division by zero,
646 overflow, underflow, invalid and inexact, but does not include
647 operations on signaling NaNs (see below). */
649 int flag_trapping_math
= 1;
651 /* Nonzero means disable transformations observable by signaling NaNs.
652 This option implies that any operation on an IEEE signaling NaN can
653 generate a (user-visible) trap. */
655 int flag_signaling_nans
= 0;
657 /* 0 means straightforward implementation of complex divide acceptable.
658 1 means wide ranges of inputs must work for complex divide.
659 2 means C99-like requirements for complex divide (not yet implemented). */
661 int flag_complex_divide_method
= 0;
663 /* Nonzero means just do syntax checking; don't output anything. */
665 int flag_syntax_only
= 0;
667 /* Nonzero means perform loop optimizer. */
669 int flag_loop_optimize
;
671 /* Nonzero means perform crossjumping. */
673 int flag_crossjumping
;
675 /* Nonzero means perform if conversion. */
677 int flag_if_conversion
;
679 /* Nonzero means perform if conversion after reload. */
681 int flag_if_conversion2
;
683 /* Nonzero means to use global dataflow analysis to eliminate
684 useless null pointer tests. */
686 int flag_delete_null_pointer_checks
;
688 /* Nonzero means perform global CSE. */
692 /* Nonzero means to do the enhanced load motion during gcse, which trys
693 to hoist loads by not killing them when a store to the same location
696 int flag_gcse_lm
= 1;
698 /* Nonzero means to perform store motion after gcse, which will try to
699 move stores closer to the exit block. Its not very effective without
702 int flag_gcse_sm
= 1;
704 /* Perform target register optimization before prologue / epilogue
707 int flag_branch_target_load_optimize
= 0;
709 /* Perform target register optimization after prologue / epilogue
710 threading and jump2. */
712 int flag_branch_target_load_optimize2
= 0;
714 /* Nonzero means to rerun cse after loop optimization. This increases
715 compilation time about 20% and picks up a few more common expressions. */
717 int flag_rerun_cse_after_loop
;
719 /* Nonzero means to run loop optimizations twice. */
721 int flag_rerun_loop_opt
;
723 /* Nonzero for -finline-functions: ok to inline functions that look like
724 good inline candidates. */
726 int flag_inline_functions
;
728 /* Nonzero for -fkeep-inline-functions: even if we make a function
729 go inline everywhere, keep its definition around for debugging
732 int flag_keep_inline_functions
;
734 /* Nonzero means that functions will not be inlined. */
736 int flag_no_inline
= 2;
738 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
739 not just because the tree inliner turned us off. */
741 int flag_really_no_inline
= 2;
743 /* Nonzero means that we should emit static const variables
744 regardless of whether or not optimization is turned on. */
746 int flag_keep_static_consts
= 1;
748 /* Nonzero means we should be saving declaration info into a .X file. */
750 int flag_gen_aux_info
= 0;
752 /* Specified name of aux-info file. */
754 const char *aux_info_file_name
;
756 /* Nonzero means make the text shared if supported. */
758 int flag_shared_data
;
760 /* Nonzero means schedule into delayed branch slots if supported. */
762 int flag_delayed_branch
;
764 /* Nonzero if we are compiling pure (sharable) code.
765 Value is 1 if we are doing "small" pic; value is 2 if we're doing
770 /* Nonzero if we are compiling position independent code for executable.
771 The value is 1 if we are doing "small" pic; value is 2 if we're doing
776 /* Nonzero if we are compiling code for a shared library, zero for
781 /* Set to the default thread-local storage (tls) model to use. */
783 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
785 /* Nonzero means generate extra code for exception handling and enable
786 exception handling. */
790 /* Nonzero means generate frame unwind info table when supported. */
792 int flag_unwind_tables
= 0;
794 /* Nonzero means generate frame unwind info table exact at each insn
797 int flag_asynchronous_unwind_tables
= 0;
799 /* Nonzero means don't place uninitialized global data in common storage
804 /* Nonzero means change certain warnings into errors.
805 Usually these are warnings about failure to conform to some standard. */
807 int flag_pedantic_errors
= 0;
809 /* flag_schedule_insns means schedule insns within basic blocks (before
811 flag_schedule_insns_after_reload means schedule insns after
814 int flag_schedule_insns
= 0;
815 int flag_schedule_insns_after_reload
= 0;
817 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
818 int flag_sched2_use_superblocks
= 0;
820 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
822 int flag_sched2_use_traces
= 0;
824 /* The following flags have effect only for scheduling before register
827 flag_schedule_interblock means schedule insns across basic blocks.
828 flag_schedule_speculative means allow speculative motion of non-load insns.
829 flag_schedule_speculative_load means allow speculative motion of some
831 flag_schedule_speculative_load_dangerous allows speculative motion of more
834 int flag_schedule_interblock
= 1;
835 int flag_schedule_speculative
= 1;
836 int flag_schedule_speculative_load
= 0;
837 int flag_schedule_speculative_load_dangerous
= 0;
839 int flag_single_precision_constant
;
841 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
842 by a cheaper branch on a count register. */
843 int flag_branch_on_count_reg
= 1;
845 /* -finhibit-size-directive inhibits output of .size for ELF.
846 This is used only for compiling crtstuff.c,
847 and it may be extended to other effects
848 needed for crtstuff.c on other systems. */
849 int flag_inhibit_size_directive
= 0;
851 /* -fverbose-asm causes extra commentary information to be produced in
852 the generated assembly code (to make it more readable). This option
853 is generally only of use to those who actually need to read the
854 generated assembly code (perhaps while debugging the compiler itself).
855 -fno-verbose-asm, the default, causes the extra information
856 to be omitted and is useful when comparing two assembler files. */
858 int flag_verbose_asm
= 0;
860 /* -dA causes debug commentary information to be produced in
861 the generated assembly code (to make it more readable). This option
862 is generally only of use to those who actually need to read the
863 generated assembly code (perhaps while debugging the compiler itself).
864 Currently, this switch is only used by dwarfout.c; however, it is intended
865 to be a catchall for printing debug information in the assembler file. */
867 int flag_debug_asm
= 0;
869 /* -dP causes the rtl to be emitted as a comment in assembly. */
871 int flag_dump_rtl_in_asm
= 0;
873 /* -fgnu-linker specifies use of the GNU linker for initializations.
874 (Or, more generally, a linker that handles initializations.)
875 -fno-gnu-linker says that collect2 will be used. */
877 int flag_gnu_linker
= 0;
879 int flag_gnu_linker
= 1;
882 /* Nonzero means put zero initialized data in the bss section. */
883 int flag_zero_initialized_in_bss
= 1;
888 /* Enable ssa conditional constant propagation. */
889 int flag_ssa_ccp
= 0;
891 /* Enable ssa aggressive dead code elimination. */
892 int flag_ssa_dce
= 0;
894 /* Tag all structures with __attribute__(packed). */
895 int flag_pack_struct
= 0;
897 /* Emit code to check for stack overflow; also may cause large objects
898 to be allocated dynamically. */
899 int flag_stack_check
;
901 /* When non-NULL, indicates that whenever space is allocated on the
902 stack, the resulting stack pointer must not pass this
903 address---that is, for stacks that grow downward, the stack pointer
904 must always be greater than or equal to this address; for stacks
905 that grow upward, the stack pointer must be less than this address.
906 At present, the rtx may be either a REG or a SYMBOL_REF, although
907 the support provided depends on the backend. */
910 /* 0 if pointer arguments may alias each other. True in C.
911 1 if pointer arguments may not alias each other but may alias
913 2 if pointer arguments may not alias each other and may not
914 alias global variables. True in Fortran.
915 This defaults to 0 for C. */
916 int flag_argument_noalias
= 0;
918 /* Nonzero if we should do (language-dependent) alias analysis.
919 Typically, this analysis will assume that expressions of certain
920 types do not alias expressions of certain other types. Only used
921 if alias analysis (in general) is enabled. */
922 int flag_strict_aliasing
= 0;
924 /* Instrument functions with calls at entry and exit, for profiling. */
925 int flag_instrument_function_entry_exit
= 0;
927 /* Nonzero means ignore `#ident' directives. 0 means handle them.
928 On SVR4 targets, it also controls whether or not to emit a
929 string identifying the compiler. */
931 int flag_no_ident
= 0;
933 /* This will perform a peephole pass before sched2. */
934 int flag_peephole2
= 0;
936 /* This will try to guess branch probabilities. */
937 int flag_guess_branch_prob
= 0;
939 /* -fcheck-bounds causes gcc to generate array bounds checks.
940 For C, C++, ObjC: defaults to off.
941 For Java: defaults to on.
942 For Fortran: defaults to off. */
943 int flag_bounds_check
= 0;
945 /* This will attempt to merge constant section constants, if 1 only
946 string constants and constants from constant pool, if 2 also constant
948 int flag_merge_constants
= 1;
950 /* If one, renumber instruction UIDs to reduce the number of
951 unused UIDs if there are a lot of instructions. If greater than
952 one, unconditionally renumber instruction UIDs. */
953 int flag_renumber_insns
= 1;
955 /* If nonzero, use the graph coloring register allocator. */
956 int flag_new_regalloc
= 0;
958 /* Nonzero if we perform superblock formation. */
962 /* Nonzero if we perform whole unit at a time compilation. */
964 int flag_unit_at_a_time
= 0;
966 /* Values of the -falign-* flags: how much to align labels in code.
967 0 means `use default', 1 means `don't align'.
968 For each variable, there is an _log variant which is the power
969 of two not less than the variable, for .align output. */
973 int align_loops_max_skip
;
976 int align_jumps_max_skip
;
978 int align_labels_log
;
979 int align_labels_max_skip
;
981 int align_functions_log
;
983 /* Like align_functions_log above, but used by front-ends to force the
984 minimum function alignment. Zero means no alignment is forced. */
985 int force_align_functions_log
;
987 /* Table of supported debugging formats. */
990 const char *const arg
;
991 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
992 constant expression, we use NO_DEBUG in its place. */
993 const enum debug_info_type debug_type
;
994 const int use_extensions_p
;
995 const char *const description
;
999 { "", NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
,
1000 N_("Generate debugging info in default format") },
1001 { "gdb", NO_DEBUG
, 1, N_("Generate debugging info in default extended format") },
1002 #ifdef DBX_DEBUGGING_INFO
1003 { "stabs", DBX_DEBUG
, 0, N_("Generate STABS format debug info") },
1004 { "stabs+", DBX_DEBUG
, 1, N_("Generate extended STABS format debug info") },
1006 #ifdef DWARF_DEBUGGING_INFO
1007 { "dwarf", DWARF_DEBUG
, 0, N_("Generate DWARF-1 format debug info") },
1008 { "dwarf+", DWARF_DEBUG
, 1,
1009 N_("Generate extended DWARF-1 format debug info") },
1011 #ifdef DWARF2_DEBUGGING_INFO
1012 { "dwarf-2", DWARF2_DEBUG
, 0, N_("Generate DWARF-2 debug info") },
1014 #ifdef XCOFF_DEBUGGING_INFO
1015 { "xcoff", XCOFF_DEBUG
, 0, N_("Generate XCOFF format debug info") },
1016 { "xcoff+", XCOFF_DEBUG
, 1, N_("Generate extended XCOFF format debug info") },
1018 #ifdef SDB_DEBUGGING_INFO
1019 { "coff", SDB_DEBUG
, 0, N_("Generate COFF format debug info") },
1021 #ifdef VMS_DEBUGGING_INFO
1022 { "vms", VMS_DEBUG
, 0, N_("Generate VMS format debug info") },
1029 const char *const string
;
1030 int *const variable
;
1033 lang_independent_options
;
1035 /* Nonzero if signed arithmetic overflow should trap. */
1038 /* Nonzero if signed arithmetic overflow should wrap around. */
1041 /* Add or remove a leading underscore from user symbols. */
1042 int flag_leading_underscore
= -1;
1044 /* The user symbol prefix after having resolved same. */
1045 const char *user_label_prefix
;
1047 static const param_info lang_independent_params
[] = {
1048 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1049 { OPTION, DEFAULT, HELP },
1050 #include "params.def"
1055 /* Table of language-independent -f options.
1056 STRING is the option name. VARIABLE is the address of the variable.
1057 ON_VALUE is the value to store in VARIABLE
1058 if `-fSTRING' is seen as an option.
1059 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1061 static const lang_independent_options f_options
[] =
1063 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1 },
1064 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols
, 1 },
1065 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types
, 1 },
1066 {"float-store", &flag_float_store
, 1 },
1067 {"defer-pop", &flag_defer_pop
, 1 },
1068 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1 },
1069 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1 },
1070 {"tracer", &flag_tracer
, 1 },
1071 {"unit-at-a-time", &flag_unit_at_a_time
, 1 },
1072 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1 },
1073 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1 },
1074 {"expensive-optimizations", &flag_expensive_optimizations
, 1 },
1075 {"thread-jumps", &flag_thread_jumps
, 1 },
1076 {"strength-reduce", &flag_strength_reduce
, 1 },
1077 {"unroll-loops", &flag_unroll_loops
, 1 },
1078 {"unroll-all-loops", &flag_unroll_all_loops
, 1 },
1079 {"old-unroll-loops", &flag_old_unroll_loops
, 1 },
1080 {"old-unroll-all-loops", &flag_old_unroll_all_loops
, 1 },
1081 {"peel-loops", &flag_peel_loops
, 1 },
1082 {"unswitch-loops", &flag_unswitch_loops
, 1 },
1083 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1 },
1084 {"move-all-movables", &flag_move_all_movables
, 1 },
1085 {"reduce-all-givs", &flag_reduce_all_givs
, 1 },
1086 {"writable-strings", &flag_writable_strings
, 1 },
1087 {"peephole", &flag_no_peephole
, 0 },
1088 {"force-mem", &flag_force_mem
, 1 },
1089 {"force-addr", &flag_force_addr
, 1 },
1090 {"function-cse", &flag_no_function_cse
, 0 },
1091 {"inline-functions", &flag_inline_functions
, 1 },
1092 {"keep-inline-functions", &flag_keep_inline_functions
, 1 },
1093 {"inline", &flag_no_inline
, 0 },
1094 {"keep-static-consts", &flag_keep_static_consts
, 1 },
1095 {"syntax-only", &flag_syntax_only
, 1 },
1096 {"shared-data", &flag_shared_data
, 1 },
1097 {"caller-saves", &flag_caller_saves
, 1 },
1098 {"pcc-struct-return", &flag_pcc_struct_return
, 1 },
1099 {"reg-struct-return", &flag_pcc_struct_return
, 0 },
1100 {"delayed-branch", &flag_delayed_branch
, 1 },
1101 {"gcse", &flag_gcse
, 1 },
1102 {"gcse-lm", &flag_gcse_lm
, 1 },
1103 {"gcse-sm", &flag_gcse_sm
, 1 },
1104 {"branch-target-load-optimize", &flag_branch_target_load_optimize
, 1 },
1105 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2
, 1 },
1106 {"loop-optimize", &flag_loop_optimize
, 1 },
1107 {"crossjumping", &flag_crossjumping
, 1 },
1108 {"if-conversion", &flag_if_conversion
, 1 },
1109 {"if-conversion2", &flag_if_conversion2
, 1 },
1110 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1 },
1111 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1 },
1112 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1 },
1113 {"schedule-insns", &flag_schedule_insns
, 1 },
1114 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1 },
1115 {"sched-interblock",&flag_schedule_interblock
, 1 },
1116 {"sched-spec",&flag_schedule_speculative
, 1 },
1117 {"sched-spec-load",&flag_schedule_speculative_load
, 1 },
1118 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1 },
1119 {"sched2-use-superblocks", &flag_sched2_use_superblocks
, 1 },
1120 {"sched2-use-traces", &flag_sched2_use_traces
, 1 },
1121 {"branch-count-reg",&flag_branch_on_count_reg
, 1 },
1122 {"pic", &flag_pic
, 1 },
1123 {"PIC", &flag_pic
, 2 },
1124 {"pie", &flag_pie
, 1 },
1125 {"PIE", &flag_pie
, 2 },
1126 {"exceptions", &flag_exceptions
, 1 },
1127 {"unwind-tables", &flag_unwind_tables
, 1 },
1128 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1 },
1129 {"non-call-exceptions", &flag_non_call_exceptions
, 1 },
1130 {"profile-arcs", &profile_arc_flag
, 1 },
1131 {"test-coverage", &flag_test_coverage
, 1 },
1132 {"branch-probabilities", &flag_branch_probabilities
, 1 },
1133 {"profile", &profile_flag
, 1 },
1134 {"reorder-blocks", &flag_reorder_blocks
, 1 },
1135 {"reorder-functions", &flag_reorder_functions
, 1 },
1136 {"rename-registers", &flag_rename_registers
, 1 },
1137 {"cprop-registers", &flag_cprop_registers
, 1 },
1138 {"common", &flag_no_common
, 0 },
1139 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1 },
1140 {"function-sections", &flag_function_sections
, 1 },
1141 {"data-sections", &flag_data_sections
, 1 },
1142 {"verbose-asm", &flag_verbose_asm
, 1 },
1143 {"gnu-linker", &flag_gnu_linker
, 1 },
1144 {"regmove", &flag_regmove
, 1 },
1145 {"optimize-register-move", &flag_regmove
, 1 },
1146 {"pack-struct", &flag_pack_struct
, 1 },
1147 {"stack-check", &flag_stack_check
, 1 },
1148 {"argument-alias", &flag_argument_noalias
, 0 },
1149 {"argument-noalias", &flag_argument_noalias
, 1 },
1150 {"argument-noalias-global", &flag_argument_noalias
, 2 },
1151 {"strict-aliasing", &flag_strict_aliasing
, 1 },
1152 {"align-loops", &align_loops
, 0 },
1153 {"align-jumps", &align_jumps
, 0 },
1154 {"align-labels", &align_labels
, 0 },
1155 {"align-functions", &align_functions
, 0 },
1156 {"merge-constants", &flag_merge_constants
, 1 },
1157 {"merge-all-constants", &flag_merge_constants
, 2 },
1158 {"dump-unnumbered", &flag_dump_unnumbered
, 1 },
1159 {"instrument-functions", &flag_instrument_function_entry_exit
, 1 },
1160 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1 },
1161 {"ssa", &flag_ssa
, 1 },
1162 {"ssa-ccp", &flag_ssa_ccp
, 1 },
1163 {"ssa-dce", &flag_ssa_dce
, 1 },
1164 {"leading-underscore", &flag_leading_underscore
, 1 },
1165 {"ident", &flag_no_ident
, 0 },
1166 { "peephole2", &flag_peephole2
, 1 },
1167 {"finite-math-only", &flag_finite_math_only
, 1 },
1168 { "guess-branch-probability", &flag_guess_branch_prob
, 1 },
1169 {"math-errno", &flag_errno_math
, 1 },
1170 {"trapping-math", &flag_trapping_math
, 1 },
1171 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1 },
1172 {"signaling-nans", &flag_signaling_nans
, 1 },
1173 {"bounds-check", &flag_bounds_check
, 1 },
1174 {"single-precision-constant", &flag_single_precision_constant
, 1 },
1175 {"time-report", &time_report
, 1 },
1176 {"mem-report", &mem_report
, 1 },
1177 { "trapv", &flag_trapv
, 1 },
1178 { "wrapv", &flag_wrapv
, 1 },
1179 { "new-ra", &flag_new_regalloc
, 1 }
1182 /* Here is a table, controlled by the tm.h file, listing each -m switch
1183 and which bits in `target_switches' it should set or clear.
1184 If VALUE is positive, it is bits to set.
1185 If VALUE is negative, -VALUE is bits to clear.
1186 (The sign bit is not used so there is no confusion.) */
1190 const char *const name
;
1192 const char *const description
;
1194 target_switches
[] = TARGET_SWITCHES
;
1196 /* This table is similar, but allows the switch to have a value. */
1198 #ifdef TARGET_OPTIONS
1201 const char *const prefix
;
1202 const char **const variable
;
1203 const char *const description
;
1204 const char *const value
;
1206 target_options
[] = TARGET_OPTIONS
;
1209 /* Nonzero means warn about function definitions that default the return type
1210 or that use a null return and have a return-type other than void. */
1212 int warn_return_type
;
1214 /* Output files for assembler code (real compiler output)
1215 and debugging dumps. */
1218 FILE *aux_info_file
;
1219 FILE *rtl_dump_file
= NULL
;
1220 FILE *cgraph_dump_file
= NULL
;
1222 /* Set up a default flag_random_seed and local_tick, unless the user
1223 already specified one. */
1228 if (!flag_random_seed
)
1230 unsigned HOST_WIDE_INT value
;
1231 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
1233 /* Get some more or less random data. */
1234 #ifdef HAVE_GETTIMEOFDAY
1238 gettimeofday (&tv
, NULL
);
1239 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
1243 time_t now
= time (NULL
);
1245 if (now
!= (time_t)-1)
1246 local_tick
= (unsigned) now
;
1249 value
= local_tick
^ getpid ();
1251 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
1252 flag_random_seed
= random_seed
;
1254 else if (!local_tick
)
1259 /* Decode the string P as an integral parameter.
1260 If the string is indeed an integer return its numeric value else
1261 issue an Invalid Option error for the option PNAME and return DEFVAL.
1262 If PNAME is zero just return DEFVAL, do not call error. */
1265 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
1267 const char *endp
= p
;
1271 if (ISDIGIT (*endp
))
1280 error ("invalid option argument `%s'", pname
);
1287 /* Return the logarithm of X, base 2, considering X unsigned,
1288 if X is a power of 2. Otherwise, returns -1.
1290 This should be used via the `exact_log2' macro. */
1293 exact_log2_wide (unsigned HOST_WIDE_INT x
)
1296 /* Test for 0 or a power of 2. */
1297 if (x
== 0 || x
!= (x
& -x
))
1299 while ((x
>>= 1) != 0)
1304 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1305 If X is 0, return -1.
1307 This should be used via the floor_log2 macro. */
1310 floor_log2_wide (unsigned HOST_WIDE_INT x
)
1319 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1320 into ICE messages, which is much more user friendly. In case the
1321 error printer crashes, reset the signal to prevent infinite recursion. */
1324 crash_signal (int signo
)
1326 signal (signo
, SIG_DFL
);
1327 internal_error ("%s", strsignal (signo
));
1330 /* Arrange to dump core on error. (The regular error message is still
1331 printed first, except in the case of abort().) */
1334 setup_core_dumping (void)
1337 signal (SIGABRT
, SIG_DFL
);
1339 #if defined(HAVE_SETRLIMIT)
1342 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
1343 fatal_error ("getting core file size maximum limit: %m");
1344 rlim
.rlim_cur
= rlim
.rlim_max
;
1345 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
1346 fatal_error ("setting core file size limit to maximum: %m");
1349 diagnostic_abort_on_error (global_dc
);
1353 /* Strip off a legitimate source ending from the input string NAME of
1354 length LEN. Rather than having to know the names used by all of
1355 our front ends, we strip off an ending of a period followed by
1356 up to five characters. (Java uses ".class".) */
1359 strip_off_ending (char *name
, int len
)
1362 for (i
= 2; i
< 6 && len
> i
; i
++)
1364 if (name
[len
- i
] == '.')
1366 name
[len
- i
] = '\0';
1372 /* Output a quoted string. */
1375 output_quoted_string (FILE *asm_file
, const char *string
)
1377 #ifdef OUTPUT_QUOTED_STRING
1378 OUTPUT_QUOTED_STRING (asm_file
, string
);
1382 putc ('\"', asm_file
);
1383 while ((c
= *string
++) != 0)
1387 if (c
== '\"' || c
== '\\')
1388 putc ('\\', asm_file
);
1392 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1394 putc ('\"', asm_file
);
1398 /* Output a file name in the form wanted by System V. */
1401 output_file_directive (FILE *asm_file
, const char *input_name
)
1403 int len
= strlen (input_name
);
1404 const char *na
= input_name
+ len
;
1406 /* NA gets INPUT_NAME sans directory names. */
1407 while (na
> input_name
)
1409 if (IS_DIR_SEPARATOR (na
[-1]))
1414 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1415 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file
, na
);
1417 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1418 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1420 fprintf (asm_file
, "\t.file\t");
1421 output_quoted_string (asm_file
, na
);
1422 fputc ('\n', asm_file
);
1427 /* Routine to open a dump file. Return true if the dump file is enabled. */
1430 open_dump_file (enum dump_file_index index
, tree decl
)
1433 const char *open_arg
;
1436 if (! dump_file
[index
].enabled
)
1439 timevar_push (TV_DUMP
);
1440 if (rtl_dump_file
!= NULL
)
1441 fclose (rtl_dump_file
);
1443 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1445 if (! dump_file
[index
].initialized
)
1447 /* If we've not initialized the files, do so now. */
1448 if (graph_dump_format
!= no_graph
1449 && dump_file
[index
].graph_dump_p
)
1451 dump_name
= concat (seq
, dump_file
[index
].extension
, NULL
);
1452 clean_graph_dump_file (dump_base_name
, dump_name
);
1455 dump_file
[index
].initialized
= 1;
1461 dump_name
= concat (dump_base_name
, seq
,
1462 dump_file
[index
].extension
, NULL
);
1464 rtl_dump_file
= fopen (dump_name
, open_arg
);
1465 if (rtl_dump_file
== NULL
)
1466 fatal_error ("can't open %s: %m", dump_name
);
1471 fprintf (rtl_dump_file
, "\n;; Function %s%s\n\n",
1472 (*lang_hooks
.decl_printable_name
) (decl
, 2),
1473 cfun
->function_frequency
== FUNCTION_FREQUENCY_HOT
1475 : cfun
->function_frequency
== FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1476 ? " (unlikely executed)"
1479 timevar_pop (TV_DUMP
);
1483 /* Routine to close a dump file. */
1486 close_dump_file (enum dump_file_index index
,
1487 void (*func
) (FILE *, rtx
),
1490 if (! rtl_dump_file
)
1493 timevar_push (TV_DUMP
);
1495 && graph_dump_format
!= no_graph
1496 && dump_file
[index
].graph_dump_p
)
1501 sprintf (seq
, DUMPFILE_FORMAT
, index
);
1502 suffix
= concat (seq
, dump_file
[index
].extension
, NULL
);
1503 print_rtl_graph_with_bb (dump_base_name
, suffix
, insns
);
1508 func (rtl_dump_file
, insns
);
1510 fflush (rtl_dump_file
);
1511 fclose (rtl_dump_file
);
1513 rtl_dump_file
= NULL
;
1514 timevar_pop (TV_DUMP
);
1517 /* Do any final processing required for the declarations in VEC, of
1518 which there are LEN. We write out inline functions and variables
1519 that have been deferred until this point, but which are required.
1520 Returns nonzero if anything was put out. */
1523 wrapup_global_declarations (tree
*vec
, int len
)
1528 int output_something
= 0;
1530 for (i
= 0; i
< len
; i
++)
1534 /* We're not deferring this any longer. Assignment is
1535 conditional to avoid needlessly dirtying PCH pages. */
1536 if (DECL_DEFER_OUTPUT (decl
) != 0)
1537 DECL_DEFER_OUTPUT (decl
) = 0;
1539 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1540 (*lang_hooks
.finish_incomplete_decl
) (decl
);
1543 /* Now emit any global variables or functions that we have been
1544 putting off. We need to loop in case one of the things emitted
1545 here references another one which comes earlier in the list. */
1549 for (i
= 0; i
< len
; i
++)
1553 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1556 /* Don't write out static consts, unless we still need them.
1558 We also keep static consts if not optimizing (for debugging),
1559 unless the user specified -fno-keep-static-consts.
1560 ??? They might be better written into the debug information.
1561 This is possible when using DWARF.
1563 A language processor that wants static constants to be always
1564 written out (even if it is not used) is responsible for
1565 calling rest_of_decl_compilation itself. E.g. the C front-end
1566 calls rest_of_decl_compilation from finish_decl.
1567 One motivation for this is that is conventional in some
1568 environments to write things like:
1569 static const char rcsid[] = "... version string ...";
1570 intending to force the string to be in the executable.
1572 A language processor that would prefer to have unneeded
1573 static constants "optimized away" would just defer writing
1574 them out until here. E.g. C++ does this, because static
1575 constants are often defined in header files.
1577 ??? A tempting alternative (for both C and C++) would be
1578 to force a constant to be written if and only if it is
1579 defined in a main file, as opposed to an include file. */
1581 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1585 if (flag_unit_at_a_time
1586 && cgraph_varpool_node (decl
)->finalized
)
1588 else if (flag_unit_at_a_time
1589 && (TREE_USED (decl
)
1590 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
1592 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1594 else if (DECL_COMDAT (decl
))
1596 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1597 && (optimize
|| !flag_keep_static_consts
1598 || DECL_ARTIFICIAL (decl
)))
1604 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1608 if (TREE_CODE (decl
) == FUNCTION_DECL
1609 && DECL_INITIAL (decl
) != 0
1610 && DECL_SAVED_INSNS (decl
) != 0
1611 && (flag_keep_inline_functions
1612 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1613 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1616 output_inline_function (decl
);
1621 output_something
= 1;
1625 return output_something
;
1628 /* Issue appropriate warnings for the global declarations in VEC (of
1629 which there are LEN). Output debugging information for them. */
1632 check_global_declarations (tree
*vec
, int len
)
1637 for (i
= 0; i
< len
; i
++)
1641 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1642 && ! TREE_ASM_WRITTEN (decl
))
1643 /* Cancel the RTL for this decl so that, if debugging info
1644 output for global variables is still to come,
1645 this one will be omitted. */
1646 SET_DECL_RTL (decl
, NULL_RTX
);
1648 /* Warn about any function
1649 declared static but not defined.
1650 We don't warn about variables,
1651 because many programs have static variables
1652 that exist only to get some text into the object file. */
1653 if (TREE_CODE (decl
) == FUNCTION_DECL
1654 && (warn_unused_function
1655 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1656 && DECL_INITIAL (decl
) == 0
1657 && DECL_EXTERNAL (decl
)
1658 && ! DECL_ARTIFICIAL (decl
)
1659 && ! TREE_PUBLIC (decl
))
1661 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1662 pedwarn ("%H'%F' used but never defined",
1663 &DECL_SOURCE_LOCATION (decl
), decl
);
1665 warning ("%H'%F' declared `static' but never defined",
1666 &DECL_SOURCE_LOCATION (decl
), decl
);
1667 /* This symbol is effectively an "extern" declaration now. */
1668 TREE_PUBLIC (decl
) = 1;
1669 assemble_external (decl
);
1672 /* Warn about static fns or vars defined but not used. */
1673 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
1674 || (warn_unused_variable
&& TREE_CODE (decl
) == VAR_DECL
))
1675 && ! TREE_USED (decl
)
1676 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1677 to handle multiple external decls in different scopes. */
1678 && ! TREE_USED (DECL_NAME (decl
))
1679 && ! DECL_EXTERNAL (decl
)
1680 && ! TREE_PUBLIC (decl
)
1681 /* A volatile variable might be used in some non-obvious way. */
1682 && ! TREE_THIS_VOLATILE (decl
)
1683 /* Global register variables must be declared to reserve them. */
1684 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
1685 /* Otherwise, ask the language. */
1686 && (*lang_hooks
.decls
.warn_unused_global
) (decl
))
1687 warning ("%H'%D' defined but not used",
1688 &DECL_SOURCE_LOCATION (decl
), decl
);
1690 /* Avoid confusing the debug information machinery when there are
1692 if (errorcount
== 0 && sorrycount
== 0)
1694 timevar_push (TV_SYMOUT
);
1695 (*debug_hooks
->global_decl
) (decl
);
1696 timevar_pop (TV_SYMOUT
);
1701 /* Save the current INPUT_LOCATION on the top entry in the
1702 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1703 INPUT_LOCATION accordingly. */
1706 push_srcloc (const char *file
, int line
)
1708 struct file_stack
*fs
;
1710 fs
= xmalloc (sizeof (struct file_stack
));
1711 fs
->location
= input_location
;
1712 fs
->next
= input_file_stack
;
1713 input_filename
= file
;
1715 input_file_stack
= fs
;
1716 input_file_stack_tick
++;
1719 /* Pop the top entry off the stack of presently open source files.
1720 Restore the INPUT_LOCATION from the new topmost entry on the
1726 struct file_stack
*fs
;
1728 fs
= input_file_stack
;
1729 input_location
= fs
->location
;
1730 input_file_stack
= fs
->next
;
1732 input_file_stack_tick
++;
1735 /* Compile an entire translation unit. Write a file of assembly
1736 output and various debugging dumps. */
1741 /* Initialize yet another pass. */
1743 init_final (main_input_filename
);
1744 coverage_init (aux_base_name
);
1746 timevar_push (TV_PARSE
);
1748 /* Call the parser, which parses the entire file (calling
1749 rest_of_compilation for each function). */
1750 (*lang_hooks
.parse_file
) (set_yydebug
);
1752 /* In case there were missing block closers,
1753 get us back to the global binding level. */
1754 (*lang_hooks
.clear_binding_stack
) ();
1756 /* Compilation is now finished except for writing
1757 what's left of the symbol table output. */
1758 timevar_pop (TV_PARSE
);
1760 if (flag_syntax_only
)
1763 (*lang_hooks
.decls
.final_write_globals
)();
1765 cgraph_varpool_assemble_pending_decls ();
1767 /* This must occur after the loop to output deferred functions.
1768 Else the coverage initializer would not be emitted if all the
1769 functions in this compilation unit were deferred. */
1772 /* Write out any pending weak symbol declarations. */
1776 /* Do dbx symbols. */
1777 timevar_push (TV_SYMOUT
);
1779 #ifdef DWARF2_UNWIND_INFO
1780 if (dwarf2out_do_frame ())
1781 dwarf2out_frame_finish ();
1784 (*debug_hooks
->finish
) (main_input_filename
);
1785 timevar_pop (TV_SYMOUT
);
1787 /* Output some stuff at end of file if nec. */
1789 dw2_output_indirect_constants ();
1791 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
1793 timevar_push (TV_DUMP
);
1794 open_dump_file (DFI_bp
, NULL
);
1798 close_dump_file (DFI_bp
, NULL
, NULL_RTX
);
1799 timevar_pop (TV_DUMP
);
1802 targetm
.asm_out
.file_end ();
1804 /* Attach a special .ident directive to the end of the file to identify
1805 the version of GCC which compiled this code. The format of the .ident
1806 string is patterned after the ones produced by native SVR4 compilers. */
1809 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
1810 IDENT_ASM_OP
, version_string
);
1813 if (optimize
> 0 && open_dump_file (DFI_combine
, NULL
))
1815 timevar_push (TV_DUMP
);
1816 dump_combine_total_stats (rtl_dump_file
);
1817 close_dump_file (DFI_combine
, NULL
, NULL_RTX
);
1818 timevar_pop (TV_DUMP
);
1822 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1823 and TYPE_DECL nodes.
1825 This does nothing for local (non-static) variables, unless the
1826 variable is a register variable with an ASMSPEC. In that case, or
1827 if the variable is not an automatic, it sets up the RTL and
1828 outputs any assembler code (label definition, storage allocation
1829 and initialization).
1831 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1832 the assembler symbol name to be used. TOP_LEVEL is nonzero
1833 if this declaration is not within a function. */
1836 rest_of_decl_compilation (tree decl
,
1837 const char *asmspec
,
1841 /* We deferred calling assemble_alias so that we could collect
1842 other attributes such as visibility. Emit the alias now. */
1845 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
));
1848 alias
= TREE_VALUE (TREE_VALUE (alias
));
1849 alias
= get_identifier (TREE_STRING_POINTER (alias
));
1850 assemble_alias (decl
, alias
);
1854 /* Forward declarations for nested functions are not "external",
1855 but we need to treat them as if they were. */
1856 if (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
1857 || TREE_CODE (decl
) == FUNCTION_DECL
)
1859 timevar_push (TV_VARCONST
);
1862 make_decl_rtl (decl
, asmspec
);
1864 /* Don't output anything when a tentative file-scope definition
1865 is seen. But at end of compilation, do output code for them. */
1866 if (at_end
|| !DECL_DEFER_OUTPUT (decl
))
1868 if (flag_unit_at_a_time
&& !cgraph_global_info_ready
1869 && TREE_CODE (decl
) != FUNCTION_DECL
&& top_level
)
1870 cgraph_varpool_finalize_decl (decl
);
1872 assemble_variable (decl
, top_level
, at_end
, 0);
1875 #ifdef ASM_FINISH_DECLARE_OBJECT
1876 if (decl
== last_assemble_variable_decl
)
1878 ASM_FINISH_DECLARE_OBJECT (asm_out_file
, decl
,
1883 timevar_pop (TV_VARCONST
);
1885 else if (DECL_REGISTER (decl
) && asmspec
!= 0)
1887 if (decode_reg_name (asmspec
) >= 0)
1889 SET_DECL_RTL (decl
, NULL_RTX
);
1890 make_decl_rtl (decl
, asmspec
);
1894 error ("invalid register name `%s' for register variable", asmspec
);
1895 DECL_REGISTER (decl
) = 0;
1900 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1901 else if ((write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
1902 && TREE_CODE (decl
) == TYPE_DECL
)
1904 timevar_push (TV_SYMOUT
);
1905 dbxout_symbol (decl
, 0);
1906 timevar_pop (TV_SYMOUT
);
1909 #ifdef SDB_DEBUGGING_INFO
1910 else if (write_symbols
== SDB_DEBUG
&& top_level
1911 && TREE_CODE (decl
) == TYPE_DECL
)
1913 timevar_push (TV_SYMOUT
);
1914 sdbout_symbol (decl
, 0);
1915 timevar_pop (TV_SYMOUT
);
1918 #ifdef DWARF2_DEBUGGING_INFO
1919 else if ((write_symbols
== DWARF2_DEBUG
1920 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
1922 && TREE_CODE (decl
) == TYPE_DECL
)
1924 timevar_push (TV_SYMOUT
);
1925 dwarf2out_decl (decl
);
1926 timevar_pop (TV_SYMOUT
);
1931 /* Called after finishing a record, union or enumeral type. */
1934 rest_of_type_compilation (
1935 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1936 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1940 tree type ATTRIBUTE_UNUSED
,
1941 int toplev ATTRIBUTE_UNUSED
1945 /* Avoid confusing the debug information machinery when there are
1947 if (errorcount
!= 0 || sorrycount
!= 0)
1950 timevar_push (TV_SYMOUT
);
1951 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1952 if (write_symbols
== DBX_DEBUG
|| write_symbols
== XCOFF_DEBUG
)
1953 dbxout_symbol (TYPE_STUB_DECL (type
), !toplev
);
1955 #ifdef SDB_DEBUGGING_INFO
1956 if (write_symbols
== SDB_DEBUG
)
1957 sdbout_symbol (TYPE_STUB_DECL (type
), !toplev
);
1959 #ifdef DWARF2_DEBUGGING_INFO
1960 if ((write_symbols
== DWARF2_DEBUG
1961 || write_symbols
== VMS_AND_DWARF2_DEBUG
)
1963 dwarf2out_decl (TYPE_STUB_DECL (type
));
1965 timevar_pop (TV_SYMOUT
);
1968 /* Turn the RTL into assembly. */
1970 rest_of_handle_final (tree decl
, rtx insns
)
1972 timevar_push (TV_FINAL
);
1977 /* Get the function's name, as described by its RTL. This may be
1978 different from the DECL_NAME name used in the source file. */
1980 x
= DECL_RTL (decl
);
1981 if (GET_CODE (x
) != MEM
)
1984 if (GET_CODE (x
) != SYMBOL_REF
)
1986 fnname
= XSTR (x
, 0);
1988 assemble_start_function (decl
, fnname
);
1989 final_start_function (insns
, asm_out_file
, optimize
);
1990 final (insns
, asm_out_file
, optimize
, 0);
1991 final_end_function ();
1993 #ifdef IA64_UNWIND_INFO
1994 /* ??? The IA-64 ".handlerdata" directive must be issued before
1995 the ".endp" directive that closes the procedure descriptor. */
1996 output_function_exception_table ();
1999 assemble_end_function (decl
, fnname
);
2001 #ifndef IA64_UNWIND_INFO
2002 /* Otherwise, it feels unclean to switch sections in the middle. */
2003 output_function_exception_table ();
2007 fflush (asm_out_file
);
2009 /* Release all memory allocated by flow. */
2010 free_basic_block_vars (0);
2012 /* Release all memory held by regsets now. */
2013 regset_release_memory ();
2015 timevar_pop (TV_FINAL
);
2021 /* Run delay slot optimization. */
2023 rest_of_handle_delay_slots (tree decl
, rtx insns
)
2025 timevar_push (TV_DBR_SCHED
);
2026 open_dump_file (DFI_dbr
, decl
);
2028 dbr_schedule (insns
, rtl_dump_file
);
2030 close_dump_file (DFI_dbr
, print_rtl
, insns
);
2031 timevar_pop (TV_DBR_SCHED
);
2038 /* Convert register usage from flat register file usage to a stack
2041 rest_of_handle_stack_regs (tree decl
, rtx insns
)
2043 timevar_push (TV_REG_STACK
);
2044 open_dump_file (DFI_stack
, decl
);
2046 if (reg_to_stack (insns
, rtl_dump_file
) && optimize
)
2048 if (cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
2049 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0))
2050 && flag_reorder_blocks
)
2052 reorder_basic_blocks ();
2053 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_POST_REGSTACK
);
2057 close_dump_file (DFI_stack
, print_rtl_with_bb
, insns
);
2058 timevar_pop (TV_REG_STACK
);
2065 /* Machine independent reorg pass. */
2067 rest_of_handle_machine_reorg (tree decl
, rtx insns
)
2069 timevar_push (TV_MACH_DEP
);
2070 open_dump_file (DFI_mach
, decl
);
2072 (*targetm
.machine_dependent_reorg
) ();
2074 close_dump_file (DFI_mach
, print_rtl
, insns
);
2075 timevar_pop (TV_MACH_DEP
);
2081 /* Run new register allocator. Return TRUE if we must exit
2082 rest_of_compilation upon return. */
2084 rest_of_handle_new_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2088 delete_trivially_dead_insns (insns
, max_reg_num ());
2091 timevar_pop (TV_LOCAL_ALLOC
);
2092 if (dump_file
[DFI_lreg
].enabled
)
2094 timevar_push (TV_DUMP
);
2096 close_dump_file (DFI_lreg
, NULL
, NULL
);
2097 timevar_pop (TV_DUMP
);
2100 /* XXX clean up the whole mess to bring live info in shape again. */
2101 timevar_push (TV_GLOBAL_ALLOC
);
2102 open_dump_file (DFI_greg
, decl
);
2104 build_insn_chain (insns
);
2105 failure
= reload (insns
, 0);
2107 timevar_pop (TV_GLOBAL_ALLOC
);
2109 if (dump_file
[DFI_greg
].enabled
)
2111 timevar_push (TV_DUMP
);
2113 dump_global_regs (rtl_dump_file
);
2115 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2116 timevar_pop (TV_DUMP
);
2122 reload_completed
= 1;
2128 /* Run old register allocator. Return TRUE if we must exit
2129 rest_of_compilation upon return. */
2131 rest_of_handle_old_regalloc (tree decl
, rtx insns
, int *rebuild_notes
)
2135 /* Allocate the reg_renumber array. */
2136 allocate_reg_info (max_regno
, FALSE
, TRUE
);
2138 /* And the reg_equiv_memory_loc array. */
2139 reg_equiv_memory_loc
= xcalloc (max_regno
, sizeof (rtx
));
2141 allocate_initial_values (reg_equiv_memory_loc
);
2143 regclass (insns
, max_reg_num (), rtl_dump_file
);
2144 *rebuild_notes
= local_alloc ();
2146 timevar_pop (TV_LOCAL_ALLOC
);
2148 if (dump_file
[DFI_lreg
].enabled
)
2150 timevar_push (TV_DUMP
);
2152 dump_flow_info (rtl_dump_file
);
2153 dump_local_alloc (rtl_dump_file
);
2155 close_dump_file (DFI_lreg
, print_rtl_with_bb
, insns
);
2156 timevar_pop (TV_DUMP
);
2161 timevar_push (TV_GLOBAL_ALLOC
);
2162 open_dump_file (DFI_greg
, decl
);
2164 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2165 pass fixing up any insns that are invalid. */
2168 failure
= global_alloc (rtl_dump_file
);
2171 build_insn_chain (insns
);
2172 failure
= reload (insns
, 0);
2175 timevar_pop (TV_GLOBAL_ALLOC
);
2177 if (dump_file
[DFI_greg
].enabled
)
2179 timevar_push (TV_DUMP
);
2181 dump_global_regs (rtl_dump_file
);
2183 close_dump_file (DFI_greg
, print_rtl_with_bb
, insns
);
2184 timevar_pop (TV_DUMP
);
2190 /* Run the regrename and cprop passes. */
2192 rest_of_handle_regrename (tree decl
, rtx insns
)
2194 timevar_push (TV_RENAME_REGISTERS
);
2195 open_dump_file (DFI_rnreg
, decl
);
2197 if (flag_rename_registers
)
2198 regrename_optimize ();
2199 if (flag_cprop_registers
)
2200 copyprop_hardreg_forward ();
2202 close_dump_file (DFI_rnreg
, print_rtl_with_bb
, insns
);
2203 timevar_pop (TV_RENAME_REGISTERS
);
2206 /* Reorder basic blocks. */
2208 rest_of_handle_reorder_blocks (tree decl
, rtx insns
)
2210 timevar_push (TV_REORDER_BLOCKS
);
2211 open_dump_file (DFI_bbro
, decl
);
2213 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2214 splitting possibly introduced more crossjumping opportunities. */
2215 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
2216 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
2218 if (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
)
2220 if (flag_reorder_blocks
)
2221 reorder_basic_blocks ();
2222 if (flag_reorder_blocks
2223 || (flag_sched2_use_traces
&& flag_schedule_insns_after_reload
))
2224 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2226 close_dump_file (DFI_bbro
, print_rtl_with_bb
, insns
);
2227 timevar_pop (TV_REORDER_BLOCKS
);
2230 #ifdef INSN_SCHEDULING
2231 /* Run instruction scheduler. */
2233 rest_of_handle_sched (tree decl
, rtx insns
)
2235 timevar_push (TV_SCHED
);
2237 /* Print function header into sched dump now
2238 because doing the sched analysis makes some of the dump. */
2239 if (optimize
> 0 && flag_schedule_insns
)
2241 open_dump_file (DFI_sched
, decl
);
2243 /* Do control and data sched analysis,
2244 and write some of the results to dump file. */
2246 schedule_insns (rtl_dump_file
);
2248 close_dump_file (DFI_sched
, print_rtl_with_bb
, insns
);
2250 timevar_pop (TV_SCHED
);
2255 /* Run second scheduling pass after reload. */
2257 rest_of_handle_sched2 (tree decl
, rtx insns
)
2259 timevar_push (TV_SCHED2
);
2260 open_dump_file (DFI_sched2
, decl
);
2262 /* Do control and data sched analysis again,
2263 and write some more of the results to dump file. */
2265 split_all_insns (1);
2267 if (flag_sched2_use_superblocks
|| flag_sched2_use_traces
)
2269 schedule_ebbs (rtl_dump_file
);
2270 /* No liveness updating code yet, but it should be easy to do.
2271 reg-stack recompute the liveness when needed for now. */
2272 count_or_remove_death_notes (NULL
, 1);
2273 cleanup_cfg (CLEANUP_EXPENSIVE
);
2276 schedule_insns (rtl_dump_file
);
2278 close_dump_file (DFI_sched2
, print_rtl_with_bb
, insns
);
2279 timevar_pop (TV_SCHED2
);
2285 /* Register allocation pre-pass, to reduce number of moves necessary
2286 for two-address machines. */
2288 rest_of_handle_regmove (tree decl
, rtx insns
)
2290 timevar_push (TV_REGMOVE
);
2291 open_dump_file (DFI_regmove
, decl
);
2293 regmove_optimize (insns
, max_reg_num (), rtl_dump_file
);
2295 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2296 close_dump_file (DFI_regmove
, print_rtl_with_bb
, insns
);
2297 timevar_pop (TV_REGMOVE
);
2304 rest_of_handle_tracer (tree decl
, rtx insns
)
2306 timevar_push (TV_TRACER
);
2307 open_dump_file (DFI_tracer
, decl
);
2309 dump_flow_info (rtl_dump_file
);
2311 cleanup_cfg (CLEANUP_EXPENSIVE
);
2312 reg_scan (insns
, max_reg_num (), 0);
2313 close_dump_file (DFI_tracer
, print_rtl_with_bb
, get_insns ());
2314 timevar_pop (TV_TRACER
);
2317 /* If-conversion and CFG cleanup. */
2319 rest_of_handle_if_conversion (tree decl
, rtx insns
)
2321 open_dump_file (DFI_ce1
, decl
);
2322 if (flag_if_conversion
)
2324 timevar_push (TV_IFCVT
);
2326 dump_flow_info (rtl_dump_file
);
2327 cleanup_cfg (CLEANUP_EXPENSIVE
);
2328 reg_scan (insns
, max_reg_num (), 0);
2330 timevar_pop (TV_IFCVT
);
2332 timevar_push (TV_JUMP
);
2333 cleanup_cfg (CLEANUP_EXPENSIVE
);
2334 reg_scan (insns
, max_reg_num (), 0);
2335 timevar_pop (TV_JUMP
);
2336 close_dump_file (DFI_ce1
, print_rtl_with_bb
, get_insns ());
2339 /* Rerun if-conversion, as combine may have simplified things enough
2340 to now meet sequence length restrictions. */
2342 rest_of_handle_if_after_combine (tree decl
, rtx insns
)
2344 timevar_push (TV_IFCVT
);
2345 open_dump_file (DFI_ce2
, decl
);
2351 close_dump_file (DFI_ce2
, print_rtl_with_bb
, insns
);
2352 timevar_pop (TV_IFCVT
);
2355 /* Do branch profiling and static profile estimation passes. */
2357 rest_of_handle_branch_prob (tree decl
, rtx insns
)
2361 timevar_push (TV_BRANCH_PROB
);
2362 open_dump_file (DFI_bp
, decl
);
2363 if (profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
2366 /* Discover and record the loop depth at the head of each basic
2367 block. The loop infrastructure does the real job for us. */
2368 flow_loops_find (&loops
, LOOP_TREE
);
2371 flow_loops_dump (&loops
, rtl_dump_file
, NULL
, 0);
2373 /* Estimate using heuristics if no profiling info is available. */
2374 if (flag_guess_branch_prob
)
2375 estimate_probability (&loops
);
2377 flow_loops_free (&loops
);
2378 close_dump_file (DFI_bp
, print_rtl_with_bb
, insns
);
2379 timevar_pop (TV_BRANCH_PROB
);
2382 /* Do control and data flow analysis; write some of the results to the
2385 rest_of_handle_cfg (tree decl
, rtx insns
)
2387 open_dump_file (DFI_cfg
, decl
);
2389 dump_flow_info (rtl_dump_file
);
2391 cleanup_cfg (CLEANUP_EXPENSIVE
2392 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2394 /* It may make more sense to mark constant functions after dead code is
2395 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2396 may insert code making function non-constant, but we still must consider
2397 it as constant, otherwise -fbranch-probabilities will not read data back.
2399 life_analysis rarely eliminates modification of external memory.
2402 mark_constant_function ();
2404 close_dump_file (DFI_cfg
, print_rtl_with_bb
, insns
);
2407 /* Purge addressofs. */
2409 rest_of_handle_addressof (tree decl
, rtx insns
)
2411 open_dump_file (DFI_addressof
, decl
);
2413 purge_addressof (insns
);
2414 if (optimize
&& purge_all_dead_edges (0))
2415 delete_unreachable_blocks ();
2416 reg_scan (insns
, max_reg_num (), 1);
2418 close_dump_file (DFI_addressof
, print_rtl
, insns
);
2421 /* We may have potential sibling or tail recursion sites. Select one
2422 (of possibly multiple) methods of performing the call. */
2424 rest_of_handle_sibling_calls (rtx insns
)
2427 optimize_sibling_and_tail_recursive_calls ();
2429 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2430 free_bb_for_insn ();
2431 find_exception_handler_labels ();
2432 rebuild_jump_labels (insns
);
2433 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2435 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2436 notes before simplifying cfg and we must do lowering after sibcall
2437 that unhides parts of RTL chain and cleans up the CFG.
2439 Until sibcall is replaced by tree-level optimizer, lets just
2440 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2441 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2442 if (GET_CODE (insn
) == NOTE
2443 && NOTE_LINE_NUMBER (insn
) == NOTE_INSN_PREDICTION
)
2446 close_dump_file (DFI_sibling
, print_rtl
, get_insns ());
2449 /* Perform jump bypassing and control flow optimizations. */
2451 rest_of_handle_jump_bypass (tree decl
, rtx insns
)
2453 timevar_push (TV_BYPASS
);
2454 open_dump_file (DFI_bypass
, decl
);
2456 cleanup_cfg (CLEANUP_EXPENSIVE
);
2458 if (bypass_jumps (rtl_dump_file
))
2460 rebuild_jump_labels (insns
);
2461 cleanup_cfg (CLEANUP_EXPENSIVE
);
2462 delete_trivially_dead_insns (insns
, max_reg_num ());
2465 close_dump_file (DFI_bypass
, print_rtl_with_bb
, insns
);
2466 timevar_pop (TV_BYPASS
);
2470 #ifdef ENABLE_CHECKING
2471 verify_flow_info ();
2475 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2476 if we must exit rest_of_compilation upon return. */
2478 rest_of_handle_inlining (tree decl
)
2485 /* If we are reconsidering an inline function at the end of
2486 compilation, skip the stuff for making it inline. */
2487 if (DECL_SAVED_INSNS (decl
) != 0)
2490 /* If this is nested inside an inlined external function, pretend
2491 it was only declared. Since we cannot inline such functions,
2492 generating code for this one is not only not necessary but will
2493 confuse some debugging output writers. */
2494 for (parent
= DECL_CONTEXT (current_function_decl
);
2495 parent
!= NULL_TREE
;
2496 parent
= get_containing_scope (parent
))
2497 if (TREE_CODE (parent
) == FUNCTION_DECL
2498 && DECL_INLINE (parent
) && DECL_EXTERNAL (parent
))
2500 DECL_INITIAL (decl
) = 0;
2503 else if (TYPE_P (parent
))
2504 /* A function in a local class should be treated normally. */
2507 /* If requested, consider whether to make this function inline. */
2508 if ((DECL_INLINE (decl
) && !flag_no_inline
)
2509 || flag_inline_functions
)
2511 timevar_push (TV_INTEGRATION
);
2512 lose
= function_cannot_inline_p (decl
);
2513 timevar_pop (TV_INTEGRATION
);
2514 if (lose
|| ! optimize
)
2516 if (warn_inline
&& lose
&& DECL_INLINE (decl
))
2518 char *msg
= xmalloc (2 + strlen (lose
) + 1);
2521 strcpy(msg
+ 2, lose
);
2522 warning (msg
, &DECL_SOURCE_LOCATION (decl
));
2525 DECL_ABSTRACT_ORIGIN (decl
) = 0;
2526 /* Don't really compile an extern inline function.
2527 If we can't make it inline, pretend
2528 it was only declared. */
2529 if (DECL_EXTERNAL (decl
))
2531 DECL_INITIAL (decl
) = 0;
2536 /* ??? Note that we used to just make it look like if
2537 the "inline" keyword was specified when we decide
2538 to inline it (because of -finline-functions).
2539 garloff@suse.de, 2002-04-24: Add another flag to
2540 actually record this piece of information. */
2541 if (!DECL_INLINE (decl
))
2542 DID_INLINE_FUNC (decl
) = 1;
2543 inlinable
= DECL_INLINE (decl
) = 1;
2547 insns
= get_insns ();
2549 /* Dump the rtl code if we are dumping rtl. */
2551 if (open_dump_file (DFI_rtl
, decl
))
2553 if (DECL_SAVED_INSNS (decl
))
2554 fprintf (rtl_dump_file
, ";; (integrable)\n\n");
2555 close_dump_file (DFI_rtl
, print_rtl
, insns
);
2558 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2559 sorts of eh initialization. Delay this until after the
2560 initial rtl dump so that we can see the original nesting. */
2561 convert_from_eh_region_ranges ();
2563 /* If function is inline, and we don't yet know whether to
2564 compile it by itself, defer decision till end of compilation.
2565 wrapup_global_declarations will (indirectly) call
2566 rest_of_compilation again for those functions that need to
2567 be output. Also defer those functions that we are supposed
2571 || (DECL_INLINE (decl
)
2572 && flag_inline_functions
2573 && ((! TREE_PUBLIC (decl
) && ! TREE_ADDRESSABLE (decl
)
2574 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
2575 && ! flag_keep_inline_functions
)
2576 || DECL_EXTERNAL (decl
))))
2577 DECL_DEFER_OUTPUT (decl
) = 1;
2579 if (DECL_INLINE (decl
))
2580 /* DWARF wants separate debugging info for abstract and
2581 concrete instances of all inline functions, including those
2582 declared inline but not inlined, and those inlined even
2583 though they weren't declared inline. Conveniently, that's
2584 what DECL_INLINE means at this point. */
2585 (*debug_hooks
->deferred_inline_function
) (decl
);
2587 if (DECL_DEFER_OUTPUT (decl
))
2589 /* If -Wreturn-type, we have to do a bit of compilation. We just
2590 want to call cleanup the cfg to figure out whether or not we can
2591 fall off the end of the function; we do the minimum amount of
2592 work necessary to make that safe. */
2593 if (warn_return_type
)
2595 int saved_optimize
= optimize
;
2598 rebuild_jump_labels (insns
);
2599 find_exception_handler_labels ();
2600 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2601 cleanup_cfg (CLEANUP_PRE_SIBCALL
| CLEANUP_PRE_LOOP
);
2602 optimize
= saved_optimize
;
2604 /* CFG is no longer maintained up-to-date. */
2605 free_bb_for_insn ();
2608 set_nothrow_function_flags ();
2609 if (current_function_nothrow
)
2610 /* Now we know that this can't throw; set the flag for the benefit
2611 of other functions later in this translation unit. */
2612 TREE_NOTHROW (current_function_decl
) = 1;
2614 timevar_push (TV_INTEGRATION
);
2615 save_for_inline (decl
);
2616 timevar_pop (TV_INTEGRATION
);
2617 DECL_SAVED_INSNS (decl
)->inlinable
= inlinable
;
2621 /* If specified extern inline but we aren't inlining it, we are
2622 done. This goes for anything that gets here with DECL_EXTERNAL
2623 set, not just things with DECL_INLINE. */
2624 return (bool) DECL_EXTERNAL (decl
);
2627 /* Rest of compilation helper to convert the rtl to SSA form. */
2629 rest_of_handle_ssa (tree decl
, rtx insns
)
2631 timevar_push (TV_TO_SSA
);
2632 open_dump_file (DFI_ssa
, decl
);
2634 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2637 close_dump_file (DFI_ssa
, print_rtl_with_bb
, insns
);
2638 timevar_pop (TV_TO_SSA
);
2640 /* Perform sparse conditional constant propagation, if requested. */
2643 timevar_push (TV_SSA_CCP
);
2644 open_dump_file (DFI_ssa_ccp
, decl
);
2648 close_dump_file (DFI_ssa_ccp
, print_rtl_with_bb
, get_insns ());
2649 timevar_pop (TV_SSA_CCP
);
2652 /* It would be useful to cleanup the CFG at this point, but block
2653 merging and possibly other transformations might leave a PHI
2654 node in the middle of a basic block, which is a strict no-no. */
2656 /* The SSA implementation uses basic block numbers in its phi
2657 nodes. Thus, changing the control-flow graph or the basic
2658 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2659 may cause problems. */
2663 /* Remove dead code. */
2665 timevar_push (TV_SSA_DCE
);
2666 open_dump_file (DFI_ssa_dce
, decl
);
2668 insns
= get_insns ();
2669 ssa_eliminate_dead_code ();
2671 close_dump_file (DFI_ssa_dce
, print_rtl_with_bb
, insns
);
2672 timevar_pop (TV_SSA_DCE
);
2675 /* Convert from SSA form. */
2677 timevar_push (TV_FROM_SSA
);
2678 open_dump_file (DFI_ussa
, decl
);
2680 convert_from_ssa ();
2681 /* New registers have been created. Rescan their usage. */
2682 reg_scan (insns
, max_reg_num (), 1);
2684 close_dump_file (DFI_ussa
, print_rtl_with_bb
, insns
);
2685 timevar_pop (TV_FROM_SSA
);
2692 /* Try to identify useless null pointer tests and delete them. */
2694 rest_of_handle_null_pointer (tree decl
, rtx insns
)
2696 open_dump_file (DFI_null
, decl
);
2698 dump_flow_info (rtl_dump_file
);
2700 if (delete_null_pointer_checks (insns
))
2701 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2703 close_dump_file (DFI_null
, print_rtl_with_bb
, insns
);
2706 /* Try combining insns through substitution. */
2708 rest_of_handle_combine (tree decl
, rtx insns
)
2710 int rebuild_jump_labels_after_combine
= 0;
2712 timevar_push (TV_COMBINE
);
2713 open_dump_file (DFI_combine
, decl
);
2715 rebuild_jump_labels_after_combine
2716 = combine_instructions (insns
, max_reg_num ());
2718 /* Combining insns may have turned an indirect jump into a
2719 direct jump. Rebuild the JUMP_LABEL fields of jumping
2721 if (rebuild_jump_labels_after_combine
)
2723 timevar_push (TV_JUMP
);
2724 rebuild_jump_labels (insns
);
2725 timevar_pop (TV_JUMP
);
2727 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
);
2730 close_dump_file (DFI_combine
, print_rtl_with_bb
, insns
);
2731 timevar_pop (TV_COMBINE
);
2736 /* Perform life analysis. */
2738 rest_of_handle_life (tree decl
, rtx insns
)
2740 open_dump_file (DFI_life
, decl
);
2743 #ifdef ENABLE_CHECKING
2744 verify_flow_info ();
2746 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
2748 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_UPDATE_LIFE
2749 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
2750 timevar_pop (TV_FLOW
);
2752 if (warn_uninitialized
)
2754 uninitialized_vars_warning (DECL_INITIAL (decl
));
2756 setjmp_args_warning ();
2761 if (!flag_new_regalloc
&& initialize_uninitialized_subregs ())
2763 /* Insns were inserted, and possibly pseudos created, so
2764 things might look a bit different. */
2765 insns
= get_insns ();
2766 allocate_reg_life_data ();
2767 update_life_info (NULL
, UPDATE_LIFE_GLOBAL_RM_NOTES
,
2768 PROP_LOG_LINKS
| PROP_REG_INFO
| PROP_DEATH_NOTES
);
2774 close_dump_file (DFI_life
, print_rtl_with_bb
, insns
);
2779 /* Perform common subexpression elimination. Nonzero value from
2780 `cse_main' means that jumps were simplified and some code may now
2781 be unreachable, so do jump optimization again. */
2783 rest_of_handle_cse (tree decl
, rtx insns
)
2787 open_dump_file (DFI_cse
, decl
);
2789 dump_flow_info (rtl_dump_file
);
2790 timevar_push (TV_CSE
);
2792 reg_scan (insns
, max_reg_num (), 1);
2794 tem
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2796 rebuild_jump_labels (insns
);
2797 purge_all_dead_edges (0);
2799 delete_trivially_dead_insns (insns
, max_reg_num ());
2801 /* If we are not running more CSE passes, then we are no longer
2802 expecting CSE to be run. But always rerun it in a cheap mode. */
2803 cse_not_expected
= !flag_rerun_cse_after_loop
&& !flag_gcse
;
2805 if (tem
|| optimize
> 1)
2806 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2807 /* Try to identify useless null pointer tests and delete them. */
2808 if (flag_delete_null_pointer_checks
)
2810 timevar_push (TV_JUMP
);
2812 if (delete_null_pointer_checks (insns
))
2813 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2814 timevar_pop (TV_JUMP
);
2817 /* The second pass of jump optimization is likely to have
2818 removed a bunch more instructions. */
2819 renumber_insns (rtl_dump_file
);
2821 timevar_pop (TV_CSE
);
2822 close_dump_file (DFI_cse
, print_rtl_with_bb
, insns
);
2825 /* Run second CSE pass after loop optimizations. */
2827 rest_of_handle_cse2 (tree decl
, rtx insns
)
2831 timevar_push (TV_CSE2
);
2832 open_dump_file (DFI_cse2
, decl
);
2834 dump_flow_info (rtl_dump_file
);
2835 /* CFG is no longer maintained up-to-date. */
2836 tem
= cse_main (insns
, max_reg_num (), 1, rtl_dump_file
);
2837 purge_all_dead_edges (0);
2838 delete_trivially_dead_insns (insns
, max_reg_num ());
2842 timevar_push (TV_JUMP
);
2843 rebuild_jump_labels (insns
);
2844 cleanup_cfg (CLEANUP_EXPENSIVE
);
2845 timevar_pop (TV_JUMP
);
2847 reg_scan (insns
, max_reg_num (), 0);
2848 close_dump_file (DFI_cse2
, print_rtl_with_bb
, insns
);
2850 timevar_pop (TV_CSE2
);
2853 /* Perform global cse. */
2855 rest_of_handle_gcse (tree decl
, rtx insns
)
2857 int save_csb
, save_cfj
;
2860 timevar_push (TV_GCSE
);
2861 open_dump_file (DFI_gcse
, decl
);
2863 tem
= gcse_main (insns
, rtl_dump_file
);
2864 rebuild_jump_labels (insns
);
2865 delete_trivially_dead_insns (insns
, max_reg_num ());
2867 save_csb
= flag_cse_skip_blocks
;
2868 save_cfj
= flag_cse_follow_jumps
;
2869 flag_cse_skip_blocks
= flag_cse_follow_jumps
= 0;
2871 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2872 if (current_function_calls_constant_p
)
2873 purge_builtin_constant_p ();
2875 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2877 if (flag_expensive_optimizations
)
2879 timevar_push (TV_CSE
);
2880 reg_scan (insns
, max_reg_num (), 1);
2881 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2882 purge_all_dead_edges (0);
2883 delete_trivially_dead_insns (insns
, max_reg_num ());
2884 timevar_pop (TV_CSE
);
2885 cse_not_expected
= !flag_rerun_cse_after_loop
;
2888 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2889 things up. Then possibly re-run CSE again. */
2893 timevar_push (TV_JUMP
);
2894 rebuild_jump_labels (insns
);
2895 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2896 timevar_pop (TV_JUMP
);
2898 if (flag_expensive_optimizations
)
2900 timevar_push (TV_CSE
);
2901 reg_scan (insns
, max_reg_num (), 1);
2902 tem2
= cse_main (insns
, max_reg_num (), 0, rtl_dump_file
);
2903 purge_all_dead_edges (0);
2904 delete_trivially_dead_insns (insns
, max_reg_num ());
2905 timevar_pop (TV_CSE
);
2909 close_dump_file (DFI_gcse
, print_rtl_with_bb
, insns
);
2910 timevar_pop (TV_GCSE
);
2913 flag_cse_skip_blocks
= save_csb
;
2914 flag_cse_follow_jumps
= save_cfj
;
2915 #ifdef ENABLE_CHECKING
2916 verify_flow_info ();
2920 /* Move constant computations out of loops. */
2922 rest_of_handle_loop_optimize (tree decl
, rtx insns
)
2924 int do_unroll
, do_prefetch
;
2926 timevar_push (TV_LOOP
);
2927 delete_dead_jumptables ();
2928 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
2929 open_dump_file (DFI_loop
, decl
);
2931 /* CFG is no longer maintained up-to-date. */
2932 free_bb_for_insn ();
2934 if (flag_unroll_loops
)
2935 do_unroll
= 0; /* Having two unrollers is useless. */
2937 do_unroll
= flag_old_unroll_loops
? LOOP_UNROLL
: LOOP_AUTO_UNROLL
;
2938 do_prefetch
= flag_prefetch_loop_arrays
? LOOP_PREFETCH
: 0;
2940 if (flag_rerun_loop_opt
)
2942 cleanup_barriers ();
2944 /* We only want to perform unrolling once. */
2945 loop_optimize (insns
, rtl_dump_file
, do_unroll
);
2948 /* The first call to loop_optimize makes some instructions
2949 trivially dead. We delete those instructions now in the
2950 hope that doing so will make the heuristics in loop work
2951 better and possibly speed up compilation. */
2952 delete_trivially_dead_insns (insns
, max_reg_num ());
2954 /* The regscan pass is currently necessary as the alias
2955 analysis code depends on this information. */
2956 reg_scan (insns
, max_reg_num (), 1);
2958 cleanup_barriers ();
2959 loop_optimize (insns
, rtl_dump_file
, do_unroll
| LOOP_BCT
| do_prefetch
);
2961 /* Loop can create trivially dead instructions. */
2962 delete_trivially_dead_insns (insns
, max_reg_num ());
2963 close_dump_file (DFI_loop
, print_rtl
, insns
);
2964 timevar_pop (TV_LOOP
);
2965 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
2970 /* Perform loop optimizations. It might be better to do them a bit
2971 sooner, but we want the profile feedback to work more
2974 rest_of_handle_loop2 (tree decl
, rtx insns
)
2976 struct loops
*loops
;
2977 timevar_push (TV_LOOP
);
2978 open_dump_file (DFI_loop2
, decl
);
2980 dump_flow_info (rtl_dump_file
);
2982 loops
= loop_optimizer_init (rtl_dump_file
);
2986 /* The optimizations: */
2987 if (flag_unswitch_loops
)
2988 unswitch_loops (loops
);
2990 if (flag_peel_loops
|| flag_unroll_loops
)
2991 unroll_and_peel_loops (loops
,
2992 (flag_peel_loops
? UAP_PEEL
: 0) |
2993 (flag_unroll_loops
? UAP_UNROLL
: 0) |
2994 (flag_unroll_all_loops
? UAP_UNROLL_ALL
: 0));
2996 loop_optimizer_finalize (loops
, rtl_dump_file
);
2999 cleanup_cfg (CLEANUP_EXPENSIVE
);
3000 delete_trivially_dead_insns (insns
, max_reg_num ());
3001 reg_scan (insns
, max_reg_num (), 0);
3003 dump_flow_info (rtl_dump_file
);
3004 close_dump_file (DFI_loop2
, print_rtl_with_bb
, get_insns ());
3005 timevar_pop (TV_LOOP
);
3009 /* This is called from finish_function (within langhooks.parse_file)
3010 after each top-level definition is parsed.
3011 It is supposed to compile that function or variable
3012 and output the assembler code for it.
3013 After we return, the tree storage is freed. */
3016 rest_of_compilation (tree decl
)
3019 int rebuild_label_notes_after_reload
;
3021 timevar_push (TV_REST_OF_COMPILATION
);
3023 /* Register rtl specific functions for cfg. */
3024 rtl_register_cfg_hooks ();
3026 /* Now that we're out of the frontend, we shouldn't have any more
3027 CONCATs anywhere. */
3028 generating_concat_p
= 0;
3030 /* When processing delayed functions, prepare_function_start() won't
3031 have been run to re-initialize it. */
3032 cse_not_expected
= ! optimize
;
3034 /* First, make sure that NOTE_BLOCK is set correctly for each
3035 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3036 if (!cfun
->x_whole_function_mode_p
)
3039 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3040 tree in sensible shape. So, we just recalculate it here. */
3041 if (cfun
->x_whole_function_mode_p
)
3046 if (rest_of_handle_inlining (decl
))
3047 goto exit_rest_of_compilation
;
3049 /* If we're emitting a nested function, make sure its parent gets
3050 emitted as well. Doing otherwise confuses debug info. */
3053 for (parent
= DECL_CONTEXT (current_function_decl
);
3054 parent
!= NULL_TREE
;
3055 parent
= get_containing_scope (parent
))
3056 if (TREE_CODE (parent
) == FUNCTION_DECL
)
3057 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent
)) = 1;
3060 /* We are now committed to emitting code for this function. Do any
3061 preparation, such as emitting abstract debug info for the inline
3062 before it gets mangled by optimization. */
3063 if (DECL_INLINE (decl
))
3064 (*debug_hooks
->outlining_inline_function
) (decl
);
3066 /* Remove any notes we don't need. That will make iterating
3067 over the instruction sequence faster, and allow the garbage
3068 collector to reclaim the memory used by the notes. */
3069 remove_unnecessary_notes ();
3074 /* Initialize some variables used by the optimizers. */
3075 init_function_for_compilation ();
3077 if (! DECL_DEFER_OUTPUT (decl
))
3078 TREE_ASM_WRITTEN (decl
) = 1;
3080 /* Now that integrate will no longer see our rtl, we need not
3081 distinguish between the return value of this function and the
3082 return value of called functions. Also, we can remove all SETs
3083 of subregs of hard registers; they are only here because of
3084 integrate. Also, we can now initialize pseudos intended to
3085 carry magic hard reg data throughout the function. */
3086 rtx_equal_function_value_matters
= 0;
3087 purge_hard_subreg_sets (get_insns ());
3089 /* Early return if there were errors. We can run afoul of our
3090 consistency checks, and there's not really much point in fixing them.
3091 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3092 if (((rtl_dump_and_exit
|| flag_syntax_only
) && !warn_return_type
)
3093 || errorcount
|| sorrycount
)
3094 goto exit_rest_of_compilation
;
3096 timevar_push (TV_JUMP
);
3097 open_dump_file (DFI_sibling
, decl
);
3098 insns
= get_insns ();
3099 rebuild_jump_labels (insns
);
3100 find_exception_handler_labels ();
3101 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3103 delete_unreachable_blocks ();
3105 /* We have to issue these warnings now already, because CFG cleanups
3106 further down may destroy the required information. */
3107 check_function_return_warnings ();
3109 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3110 if (flag_guess_branch_prob
)
3112 timevar_push (TV_BRANCH_PROB
);
3113 note_prediction_to_br_prob ();
3114 timevar_pop (TV_BRANCH_PROB
);
3117 if (flag_optimize_sibling_calls
)
3118 rest_of_handle_sibling_calls (insns
);
3120 timevar_pop (TV_JUMP
);
3122 insn_locators_initialize ();
3123 /* Complete generation of exception handling code. */
3126 timevar_push (TV_JUMP
);
3127 open_dump_file (DFI_eh
, decl
);
3129 finish_eh_generation ();
3131 close_dump_file (DFI_eh
, print_rtl
, get_insns ());
3132 timevar_pop (TV_JUMP
);
3135 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3136 generation, which might create new sets. */
3137 emit_initial_value_sets ();
3140 /* If we are doing position-independent code generation, now
3141 is the time to output special prologues and epilogues.
3142 We do not want to do this earlier, because it just clutters
3143 up inline functions with meaningless insns. */
3148 insns
= get_insns ();
3150 /* Copy any shared structure that should not be shared. */
3151 unshare_all_rtl (current_function_decl
, insns
);
3153 #ifdef SETJMP_VIA_SAVE_AREA
3154 /* This must be performed before virtual register instantiation.
3155 Please be aware the everything in the compiler that can look
3156 at the RTL up to this point must understand that REG_SAVE_AREA
3157 is just like a use of the REG contained inside. */
3158 if (current_function_calls_alloca
)
3159 optimize_save_area_alloca (insns
);
3162 /* Instantiate all virtual registers. */
3163 instantiate_virtual_regs (current_function_decl
, insns
);
3165 open_dump_file (DFI_jump
, decl
);
3167 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3168 are initialized and to compute whether control can drop off the end
3171 timevar_push (TV_JUMP
);
3172 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3173 before jump optimization switches branch directions. */
3174 if (flag_guess_branch_prob
)
3175 expected_value_to_br_prob ();
3177 reg_scan (insns
, max_reg_num (), 0);
3178 rebuild_jump_labels (insns
);
3179 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3180 delete_trivially_dead_insns (insns
, max_reg_num ());
3182 dump_flow_info (rtl_dump_file
);
3183 cleanup_cfg ((optimize
? CLEANUP_EXPENSIVE
: 0) | CLEANUP_PRE_LOOP
3184 | (flag_thread_jumps
? CLEANUP_THREADING
: 0));
3188 free_bb_for_insn ();
3189 copy_loop_headers (insns
);
3190 find_basic_blocks (insns
, max_reg_num (), rtl_dump_file
);
3192 purge_line_number_notes (insns
);
3194 timevar_pop (TV_JUMP
);
3195 close_dump_file (DFI_jump
, print_rtl
, insns
);
3197 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3198 if (rtl_dump_and_exit
|| flag_syntax_only
|| DECL_DEFER_OUTPUT (decl
))
3199 goto exit_rest_of_compilation
;
3201 /* Long term, this should probably move before the jump optimizer too,
3202 but I didn't want to disturb the rtl_dump_and_exit and related
3203 stuff at this time. */
3204 if (optimize
> 0 && flag_ssa
)
3205 insns
= rest_of_handle_ssa (decl
, insns
);
3207 timevar_push (TV_JUMP
);
3210 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_PRE_LOOP
);
3212 if (flag_delete_null_pointer_checks
)
3213 rest_of_handle_null_pointer (decl
, insns
);
3215 /* Jump optimization, and the removal of NULL pointer checks, may
3216 have reduced the number of instructions substantially. CSE, and
3217 future passes, allocate arrays whose dimensions involve the
3218 maximum instruction UID, so if we can reduce the maximum UID
3219 we'll save big on memory. */
3220 renumber_insns (rtl_dump_file
);
3221 timevar_pop (TV_JUMP
);
3223 close_dump_file (DFI_jump
, print_rtl_with_bb
, insns
);
3228 rest_of_handle_cse (decl
, insns
);
3230 rest_of_handle_addressof (decl
, insns
);
3237 rest_of_handle_gcse (decl
, insns
);
3239 if (flag_loop_optimize
)
3240 rest_of_handle_loop_optimize (decl
, insns
);
3243 rest_of_handle_jump_bypass (decl
, insns
);
3246 timevar_push (TV_FLOW
);
3248 rest_of_handle_cfg (decl
, insns
);
3251 || profile_arc_flag
|| flag_test_coverage
|| flag_branch_probabilities
)
3252 rest_of_handle_branch_prob (decl
, insns
);
3255 rest_of_handle_if_conversion (decl
, insns
);
3258 rest_of_handle_tracer (decl
, insns
);
3261 && (flag_unswitch_loops
3263 || flag_unroll_loops
))
3264 rest_of_handle_loop2 (decl
, insns
);
3266 if (flag_rerun_cse_after_loop
)
3267 rest_of_handle_cse2 (decl
, insns
);
3269 cse_not_expected
= 1;
3271 rest_of_handle_life (decl
, insns
);
3274 rest_of_handle_combine (decl
, insns
);
3276 if (flag_if_conversion
)
3277 rest_of_handle_if_after_combine (decl
, insns
);
3279 if (optimize
> 0 && (flag_regmove
|| flag_expensive_optimizations
))
3280 rest_of_handle_regmove (decl
, insns
);
3282 /* Do unconditional splitting before register allocation to allow machine
3283 description to add extra information not needed previously. */
3284 split_all_insns (1);
3286 #ifdef OPTIMIZE_MODE_SWITCHING
3287 timevar_push (TV_MODE_SWITCH
);
3290 optimize_mode_switching (NULL
);
3293 timevar_pop (TV_MODE_SWITCH
);
3296 /* Any of the several passes since flow1 will have munged register
3297 lifetime data a bit. We need it to be up to date for scheduling
3298 (see handling of reg_known_equiv in init_alias_analysis). */
3299 recompute_reg_usage (insns
, !optimize_size
);
3301 #ifdef INSN_SCHEDULING
3302 rest_of_handle_sched (decl
, insns
);
3305 /* Determine if the current function is a leaf before running reload
3306 since this can impact optimizations done by the prologue and
3307 epilogue thus changing register elimination offsets. */
3308 current_function_is_leaf
= leaf_function_p ();
3310 timevar_push (TV_LOCAL_ALLOC
);
3311 open_dump_file (DFI_lreg
, decl
);
3313 if (flag_new_regalloc
)
3315 if (rest_of_handle_new_regalloc (decl
, insns
,
3316 &rebuild_label_notes_after_reload
))
3317 goto exit_rest_of_compilation
;
3321 if (rest_of_handle_old_regalloc (decl
, insns
,
3322 &rebuild_label_notes_after_reload
))
3323 goto exit_rest_of_compilation
;
3328 open_dump_file (DFI_postreload
, decl
);
3330 /* Do a very simple CSE pass over just the hard registers. */
3333 timevar_push (TV_RELOAD_CSE_REGS
);
3334 reload_cse_regs (insns
);
3335 timevar_pop (TV_RELOAD_CSE_REGS
);
3338 /* Register allocation and reloading may have turned an indirect jump into
3339 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3340 jumping instructions. */
3341 if (rebuild_label_notes_after_reload
)
3343 timevar_push (TV_JUMP
);
3345 rebuild_jump_labels (insns
);
3346 purge_all_dead_edges (0);
3348 timevar_pop (TV_JUMP
);
3351 close_dump_file (DFI_postreload
, print_rtl_with_bb
, insns
);
3353 /* Re-create the death notes which were deleted during reload. */
3354 timevar_push (TV_FLOW2
);
3355 open_dump_file (DFI_flow2
, decl
);
3357 #ifdef ENABLE_CHECKING
3358 verify_flow_info ();
3361 /* If optimizing, then go ahead and split insns now. */
3365 split_all_insns (0);
3367 if (flag_branch_target_load_optimize
)
3369 open_dump_file (DFI_branch_target_load
, decl
);
3371 branch_target_load_optimize (insns
, false);
3373 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3379 cleanup_cfg (CLEANUP_EXPENSIVE
);
3381 /* On some machines, the prologue and epilogue code, or parts thereof,
3382 can be represented as RTL. Doing so lets us schedule insns between
3383 it and the rest of the code and also allows delayed branch
3384 scheduling to operate in the epilogue. */
3385 thread_prologue_and_epilogue_insns (insns
);
3386 epilogue_completed
= 1;
3390 life_analysis (insns
, rtl_dump_file
, PROP_FINAL
);
3391 cleanup_cfg (CLEANUP_EXPENSIVE
| CLEANUP_UPDATE_LIFE
3392 | (flag_crossjumping
? CLEANUP_CROSSJUMP
: 0));
3394 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3395 even for machines with possibly nonzero RETURN_POPS_ARGS
3396 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3397 push instructions will have popping returns. */
3398 #ifndef PUSH_ROUNDING
3399 if (!ACCUMULATE_OUTGOING_ARGS
)
3401 combine_stack_adjustments ();
3406 flow2_completed
= 1;
3408 close_dump_file (DFI_flow2
, print_rtl_with_bb
, insns
);
3409 timevar_pop (TV_FLOW2
);
3411 #ifdef HAVE_peephole2
3412 if (optimize
> 0 && flag_peephole2
)
3414 timevar_push (TV_PEEPHOLE2
);
3415 open_dump_file (DFI_peephole2
, decl
);
3417 peephole2_optimize (rtl_dump_file
);
3419 close_dump_file (DFI_peephole2
, print_rtl_with_bb
, insns
);
3420 timevar_pop (TV_PEEPHOLE2
);
3426 if (flag_rename_registers
|| flag_cprop_registers
)
3427 rest_of_handle_regrename (decl
, insns
);
3429 rest_of_handle_reorder_blocks (decl
, insns
);
3432 if (flag_if_conversion2
)
3434 timevar_push (TV_IFCVT2
);
3435 open_dump_file (DFI_ce3
, decl
);
3439 close_dump_file (DFI_ce3
, print_rtl_with_bb
, insns
);
3440 timevar_pop (TV_IFCVT2
);
3443 if (flag_branch_target_load_optimize2
)
3445 /* Leave this a warning for now so that it is possible to experiment
3446 with running this pass twice. In 3.6, we should either make this
3447 an error, or use separate dump files. */
3448 if (flag_branch_target_load_optimize
)
3449 warning ("branch target register load optimization is not intended "
3452 open_dump_file (DFI_branch_target_load
, decl
);
3454 branch_target_load_optimize (insns
, true);
3456 close_dump_file (DFI_branch_target_load
, print_rtl_with_bb
, insns
);
3461 #ifdef INSN_SCHEDULING
3462 if (optimize
> 0 && flag_schedule_insns_after_reload
)
3463 rest_of_handle_sched2 (decl
, insns
);
3466 #ifdef LEAF_REGISTERS
3467 current_function_uses_only_leaf_regs
3468 = optimize
> 0 && only_leaf_regs_used () && leaf_function_p ();
3472 rest_of_handle_stack_regs (decl
, insns
);
3475 compute_alignments ();
3477 /* CFG is no longer maintained up-to-date. */
3478 free_bb_for_insn ();
3480 if (targetm
.machine_dependent_reorg
!= 0)
3481 rest_of_handle_machine_reorg (decl
, insns
);
3483 purge_line_number_notes (insns
);
3484 cleanup_barriers ();
3487 if (optimize
> 0 && flag_delayed_branch
)
3488 rest_of_handle_delay_slots (decl
, insns
);
3491 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3492 timevar_push (TV_SHORTEN_BRANCH
);
3493 split_all_insns_noflow ();
3494 timevar_pop (TV_SHORTEN_BRANCH
);
3497 convert_to_eh_region_ranges ();
3499 /* Shorten branches. */
3500 timevar_push (TV_SHORTEN_BRANCH
);
3501 shorten_branches (get_insns ());
3502 timevar_pop (TV_SHORTEN_BRANCH
);
3504 set_nothrow_function_flags ();
3505 if (current_function_nothrow
)
3506 /* Now we know that this can't throw; set the flag for the benefit
3507 of other functions later in this translation unit. */
3508 TREE_NOTHROW (current_function_decl
) = 1;
3510 rest_of_handle_final (decl
, insns
);
3512 /* Write DBX symbols if requested. */
3514 /* Note that for those inline functions where we don't initially
3515 know for certain that we will be generating an out-of-line copy,
3516 the first invocation of this routine (rest_of_compilation) will
3517 skip over this code by doing a `goto exit_rest_of_compilation;'.
3518 Later on, wrapup_global_declarations will (indirectly) call
3519 rest_of_compilation again for those inline functions that need
3520 to have out-of-line copies generated. During that call, we
3521 *will* be routed past here. */
3523 timevar_push (TV_SYMOUT
);
3524 (*debug_hooks
->function_decl
) (decl
);
3525 timevar_pop (TV_SYMOUT
);
3527 exit_rest_of_compilation
:
3529 coverage_end_function ();
3531 /* In case the function was not output,
3532 don't leave any temporary anonymous types
3533 queued up for sdb output. */
3534 #ifdef SDB_DEBUGGING_INFO
3535 if (write_symbols
== SDB_DEBUG
)
3536 sdbout_types (NULL_TREE
);
3539 reload_completed
= 0;
3540 epilogue_completed
= 0;
3541 flow2_completed
= 0;
3544 timevar_push (TV_FINAL
);
3546 /* Clear out the insn_length contents now that they are no
3548 init_insn_lengths ();
3550 /* Show no temporary slots allocated. */
3553 free_basic_block_vars (0);
3554 free_bb_for_insn ();
3556 timevar_pop (TV_FINAL
);
3558 if ((*targetm
.binds_local_p
) (current_function_decl
))
3560 int pref
= cfun
->preferred_stack_boundary
;
3561 if (cfun
->recursive_call_emit
3562 && cfun
->stack_alignment_needed
> cfun
->preferred_stack_boundary
)
3563 pref
= cfun
->stack_alignment_needed
;
3564 cgraph_rtl_info (current_function_decl
)->preferred_incoming_stack_boundary
3568 /* Make sure volatile mem refs aren't considered valid operands for
3569 arithmetic insns. We must call this here if this is a nested inline
3570 function, since the above code leaves us in the init_recog state
3571 (from final.c), and the function context push/pop code does not
3572 save/restore volatile_ok.
3574 ??? Maybe it isn't necessary for expand_start_function to call this
3575 anymore if we do it here? */
3577 init_recog_no_volatile ();
3579 /* We're done with this function. Free up memory if we can. */
3580 free_after_parsing (cfun
);
3581 if (! DECL_DEFER_OUTPUT (decl
))
3583 free_after_compilation (cfun
);
3585 /* Clear integrate.c's pointer to the cfun structure we just
3587 DECL_SAVED_INSNS (decl
) = 0;
3593 timevar_pop (TV_REST_OF_COMPILATION
);
3596 /* Display help for generic options. */
3602 for (i
= ARRAY_SIZE (debug_args
); i
--;)
3604 if (debug_args
[i
].description
!= NULL
)
3605 printf (" -g%-21s %s\n",
3606 debug_args
[i
].arg
, _(debug_args
[i
].description
));
3609 display_target_options ();
3612 /* Display help for target options. */
3614 display_target_options (void)
3617 static bool displayed
= false;
3619 /* Avoid double printing for --help --target-help. */
3625 if (ARRAY_SIZE (target_switches
) > 1
3626 #ifdef TARGET_OPTIONS
3627 || ARRAY_SIZE (target_options
) > 1
3635 printf (_("\nTarget specific options:\n"));
3637 for (i
= ARRAY_SIZE (target_switches
); i
--;)
3639 const char *option
= target_switches
[i
].name
;
3640 const char *description
= target_switches
[i
].description
;
3642 if (option
== NULL
|| *option
== 0)
3644 else if (description
== NULL
)
3649 printf (_(" -m%-23s [undocumented]\n"), option
);
3651 else if (*description
!= 0)
3652 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3655 #ifdef TARGET_OPTIONS
3656 for (i
= ARRAY_SIZE (target_options
); i
--;)
3658 const char *option
= target_options
[i
].prefix
;
3659 const char *description
= target_options
[i
].description
;
3661 if (option
== NULL
|| *option
== 0)
3663 else if (description
== NULL
)
3668 printf (_(" -m%-23s [undocumented]\n"), option
);
3670 else if (*description
!= 0)
3671 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
3677 printf (_("\nThere are undocumented target specific options as well.\n"));
3679 printf (_(" They exist, but they are not documented.\n"));
3684 /* Parse a -d... command line switch. */
3687 decode_d_option (const char *arg
)
3695 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3696 dump_file
[i
].enabled
= 1;
3702 flag_print_asm_name
= 1;
3705 flag_dump_rtl_in_asm
= 1;
3706 flag_print_asm_name
= 1;
3709 graph_dump_format
= vcg
;
3712 rtl_dump_and_exit
= 1;
3717 case 'D': /* These are handled by the preprocessor. */
3721 setup_core_dumping();
3726 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
3727 if (c
== dump_file
[i
].debug_switch
)
3729 dump_file
[i
].enabled
= 1;
3734 warning ("unrecognized gcc debugging option: %c", c
);
3739 /* Indexed by enum debug_info_type. */
3740 const char *const debug_type_names
[] =
3742 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3745 /* Parse a -g... command line switch. ARG is the value after the -g.
3746 It is safe to access 'ARG - 2' to generate the full switch name.
3747 Return the number of strings consumed. */
3750 decode_g_option (const char *arg
)
3752 static unsigned level
= 0;
3753 /* A lot of code assumes write_symbols == NO_DEBUG if the
3754 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3755 of what debugging type has been selected). This records the
3756 selected type. It is an error to specify more than one
3758 static enum debug_info_type selected_debug_type
= NO_DEBUG
;
3759 /* Nonzero if debugging format has been explicitly set.
3760 -g and -ggdb don't explicitly set the debugging format so
3761 -gdwarf -g3 is equivalent to -gdwarf3. */
3762 static int type_explicitly_set_p
= 0;
3764 /* The maximum admissible debug level value. */
3765 static const unsigned max_debug_level
= 3;
3767 /* Look up ARG in the table. */
3768 for (da
= debug_args
; da
->arg
; da
++)
3770 const int da_len
= strlen (da
->arg
);
3772 if (da_len
== 0 || ! strncmp (arg
, da
->arg
, da_len
))
3774 enum debug_info_type type
= da
->debug_type
;
3775 const char *p
= arg
+ da_len
;
3777 if (*p
&& ! ISDIGIT (*p
))
3780 /* A debug flag without a level defaults to level 2.
3781 Note we do not want to call read_integral_parameter
3782 for that case since it will call atoi which
3785 ??? We may want to generalize the interface to
3786 read_integral_parameter to better handle this case
3787 if this case shows up often. */
3789 level
= read_integral_parameter (p
, 0, max_debug_level
+ 1);
3791 level
= (level
== 0) ? 2 : level
;
3793 if (da_len
> 1 && *p
&& !strncmp (arg
, "dwarf", da_len
))
3795 error ("use -gdwarf -g%d for DWARF v1, level %d",
3798 error ("use -gdwarf-2 for DWARF v2");
3801 if (level
> max_debug_level
)
3804 ignoring option `%s' due to invalid debug level specification",
3806 level
= debug_info_level
;
3809 if (type
== NO_DEBUG
)
3811 type
= PREFERRED_DEBUGGING_TYPE
;
3813 if (da_len
> 1 && strncmp (arg
, "gdb", da_len
) == 0)
3815 #ifdef DWARF2_DEBUGGING_INFO
3816 type
= DWARF2_DEBUG
;
3818 #ifdef DBX_DEBUGGING_INFO
3825 if (type
== NO_DEBUG
)
3826 warning ("`%s': unknown or unsupported -g option", arg
- 2);
3828 /* Does it conflict with an already selected type? */
3829 if (type_explicitly_set_p
3830 /* -g/-ggdb don't conflict with anything. */
3831 && da
->debug_type
!= NO_DEBUG
3832 && type
!= selected_debug_type
)
3833 warning ("`%s' ignored, conflicts with `-g%s'",
3834 arg
- 2, debug_type_names
[(int) selected_debug_type
]);
3837 /* If the format has already been set, -g/-ggdb
3838 only change the debug level. */
3839 if (type_explicitly_set_p
&& da
->debug_type
== NO_DEBUG
)
3840 /* Don't change debugging type. */
3844 selected_debug_type
= type
;
3845 type_explicitly_set_p
= da
->debug_type
!= NO_DEBUG
;
3848 write_symbols
= (level
== 0
3850 : selected_debug_type
);
3851 use_gnu_debug_info_extensions
= da
->use_extensions_p
;
3852 debug_info_level
= (enum debug_info_level
) level
;
3860 warning ("`-g%s': unknown or unsupported -g option", arg
);
3863 /* Decode -m switches. */
3864 /* Decode the switch -mNAME. */
3867 set_target_switch (const char *name
)
3870 int valid_target_option
= 0;
3872 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
3873 if (!strcmp (target_switches
[j
].name
, name
))
3875 if (target_switches
[j
].value
< 0)
3876 target_flags
&= ~-target_switches
[j
].value
;
3878 target_flags
|= target_switches
[j
].value
;
3881 if (target_switches
[j
].value
< 0)
3882 target_flags_explicit
|= -target_switches
[j
].value
;
3884 target_flags_explicit
|= target_switches
[j
].value
;
3886 valid_target_option
= 1;
3889 #ifdef TARGET_OPTIONS
3890 if (!valid_target_option
)
3891 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
3893 int len
= strlen (target_options
[j
].prefix
);
3894 if (target_options
[j
].value
)
3896 if (!strcmp (target_options
[j
].prefix
, name
))
3898 *target_options
[j
].variable
= target_options
[j
].value
;
3899 valid_target_option
= 1;
3904 if (!strncmp (target_options
[j
].prefix
, name
, len
))
3906 *target_options
[j
].variable
= name
+ len
;
3907 valid_target_option
= 1;
3913 if (!valid_target_option
)
3914 error ("invalid option `%s'", name
);
3917 /* Print version information to FILE.
3918 Each line begins with INDENT (for the case where FILE is the
3919 assembler output file). */
3922 print_version (FILE *file
, const char *indent
)
3925 #define __VERSION__ "[?]"
3929 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3931 "%s%s%s version %s (%s) compiled by CC.\n"
3933 , indent
, *indent
!= 0 ? " " : "",
3934 lang_hooks
.name
, version_string
, TARGET_NAME
,
3935 indent
, __VERSION__
);
3936 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3937 indent
, *indent
!= 0 ? " " : "",
3938 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
3941 /* Print an option value and return the adjusted position in the line.
3942 ??? We don't handle error returns from fprintf (disk full); presumably
3943 other code will catch a disk full though. */
3946 print_single_switch (FILE *file
, int pos
, int max
,
3947 const char *indent
, const char *sep
, const char *term
,
3948 const char *type
, const char *name
)
3950 /* The ultrix fprintf returns 0 on success, so compute the result we want
3951 here since we need it for the following test. */
3952 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
3957 fprintf (file
, "%s", term
);
3962 fprintf (file
, "%s", indent
);
3963 pos
= strlen (indent
);
3965 fprintf (file
, "%s%s%s", sep
, type
, name
);
3970 /* Print active target switches to FILE.
3971 POS is the current cursor position and MAX is the size of a "line".
3972 Each line begins with INDENT and ends with TERM.
3973 Each switch is separated from the next by SEP. */
3976 print_switch_values (FILE *file
, int pos
, int max
,
3977 const char *indent
, const char *sep
, const char *term
)
3982 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3983 that it can be printed below. This helps reproducibility. */
3986 /* Print the options as passed. */
3987 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
3988 _("options passed: "), "");
3990 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
3994 if (strcmp (*p
, "-o") == 0)
4000 if (strcmp (*p
, "-quiet") == 0)
4002 if (strcmp (*p
, "-version") == 0)
4007 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
4010 fprintf (file
, "%s", term
);
4012 /* Print the -f and -m options that have been enabled.
4013 We don't handle language specific options but printing argv
4016 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
4017 _("options enabled: "), "");
4019 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
4020 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
4021 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4022 "-f", f_options
[j
].string
);
4024 /* Print target specific options. */
4026 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
4027 if (target_switches
[j
].name
[0] != '\0'
4028 && target_switches
[j
].value
> 0
4029 && ((target_switches
[j
].value
& target_flags
)
4030 == target_switches
[j
].value
))
4032 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4033 "-m", target_switches
[j
].name
);
4036 #ifdef TARGET_OPTIONS
4037 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
4038 if (*target_options
[j
].variable
!= NULL
)
4041 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
4042 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
4043 prefix
, *target_options
[j
].variable
);
4047 fprintf (file
, "%s", term
);
4050 /* Open assembly code output file. Do this even if -fsyntax-only is
4051 on, because then the driver will have provided the name of a
4052 temporary file or bit bucket for us. NAME is the file specified on
4053 the command line, possibly NULL. */
4055 init_asm_output (const char *name
)
4057 if (name
== NULL
&& asm_file_name
== 0)
4058 asm_out_file
= stdout
;
4061 if (asm_file_name
== 0)
4063 int len
= strlen (dump_base_name
);
4064 char *dumpname
= xmalloc (len
+ 6);
4065 memcpy (dumpname
, dump_base_name
, len
+ 1);
4066 strip_off_ending (dumpname
, len
);
4067 strcat (dumpname
, ".s");
4068 asm_file_name
= dumpname
;
4070 if (!strcmp (asm_file_name
, "-"))
4071 asm_out_file
= stdout
;
4073 asm_out_file
= fopen (asm_file_name
, "w+");
4074 if (asm_out_file
== 0)
4075 fatal_error ("can't open %s for writing: %m", asm_file_name
);
4078 #ifdef IO_BUFFER_SIZE
4079 setvbuf (asm_out_file
, xmalloc (IO_BUFFER_SIZE
),
4080 _IOFBF
, IO_BUFFER_SIZE
);
4083 if (!flag_syntax_only
)
4085 targetm
.asm_out
.file_start ();
4087 #ifdef ASM_COMMENT_START
4088 if (flag_verbose_asm
)
4090 /* Print the list of options in effect. */
4091 print_version (asm_out_file
, ASM_COMMENT_START
);
4092 print_switch_values (asm_out_file
, 0, MAX_LINE
,
4093 ASM_COMMENT_START
, " ", "\n");
4094 /* Add a blank line here so it appears in assembler output but not
4096 fprintf (asm_out_file
, "\n");
4102 /* Default tree printer. Handles declarations only. */
4104 default_tree_printer (pretty_printer
* pp
, text_info
*text
)
4106 switch (*text
->format_spec
)
4112 tree t
= va_arg (*text
->args_ptr
, tree
);
4113 const char *n
= DECL_NAME (t
)
4114 ? (*lang_hooks
.decl_printable_name
) (t
, 2)
4125 /* Initialization of the front end environment, before command line
4126 options are parsed. Signal handlers, internationalization etc.
4127 ARGV0 is main's argv[0]. */
4129 general_init (const char *argv0
)
4133 p
= argv0
+ strlen (argv0
);
4134 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
4138 xmalloc_set_program_name (progname
);
4142 gcc_init_libintl ();
4144 /* Initialize the diagnostics reporting machinery, so option parsing
4145 can give warnings and errors. */
4146 diagnostic_initialize (global_dc
);
4147 /* Set a default printer. Language specific initializations will
4148 override it later. */
4149 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
4151 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4153 signal (SIGSEGV
, crash_signal
);
4156 signal (SIGILL
, crash_signal
);
4159 signal (SIGBUS
, crash_signal
);
4162 signal (SIGABRT
, crash_signal
);
4164 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4165 signal (SIGIOT
, crash_signal
);
4168 signal (SIGFPE
, crash_signal
);
4171 /* Other host-specific signal setup. */
4172 (*host_hooks
.extra_signals
)();
4174 /* Initialize the garbage-collector, string pools and tree type hash
4180 /* Initialize register usage now so switches may override. */
4183 /* Register the language-independent parameters. */
4184 add_params (lang_independent_params
, LAST_PARAM
);
4186 /* This must be done after add_params but before argument processing. */
4187 init_ggc_heuristics();
4190 /* Process the options that have been parsed. */
4192 process_options (void)
4194 /* Allow the front end to perform consistency checks and do further
4195 initialization based on the command line options. This hook also
4196 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4197 so we can correctly initialize debug output. */
4198 no_backend
= (*lang_hooks
.post_options
) (&main_input_filename
);
4199 input_filename
= main_input_filename
;
4201 #ifdef OVERRIDE_OPTIONS
4202 /* Some machines may reject certain combinations of options. */
4206 /* Set aux_base_name if not already set. */
4209 else if (main_input_filename
)
4211 char *name
= xstrdup (lbasename (main_input_filename
));
4213 strip_off_ending (name
, strlen (name
));
4214 aux_base_name
= name
;
4217 aux_base_name
= "gccaux";
4219 /* Set up the align_*_log variables, defaulting them to 1 if they
4220 were still unset. */
4221 if (align_loops
<= 0) align_loops
= 1;
4222 if (align_loops_max_skip
> align_loops
|| !align_loops
)
4223 align_loops_max_skip
= align_loops
- 1;
4224 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
4225 if (align_jumps
<= 0) align_jumps
= 1;
4226 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
4227 align_jumps_max_skip
= align_jumps
- 1;
4228 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
4229 if (align_labels
<= 0) align_labels
= 1;
4230 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
4231 if (align_labels_max_skip
> align_labels
|| !align_labels
)
4232 align_labels_max_skip
= align_labels
- 1;
4233 if (align_functions
<= 0) align_functions
= 1;
4234 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
4236 /* Unrolling all loops implies that standard loop unrolling must also
4238 if (flag_unroll_all_loops
)
4239 flag_unroll_loops
= 1;
4241 if (flag_unroll_loops
)
4243 flag_old_unroll_loops
= 0;
4244 flag_old_unroll_all_loops
= 0;
4247 if (flag_old_unroll_all_loops
)
4248 flag_old_unroll_loops
= 1;
4250 /* Old loop unrolling requires that strength_reduction be on also. Silently
4251 turn on strength reduction here if it isn't already on. Also, the loop
4252 unrolling code assumes that cse will be run after loop, so that must
4253 be turned on also. */
4254 if (flag_old_unroll_loops
)
4256 flag_strength_reduce
= 1;
4257 flag_rerun_cse_after_loop
= 1;
4259 if (flag_unroll_loops
|| flag_peel_loops
)
4260 flag_rerun_cse_after_loop
= 1;
4262 if (flag_non_call_exceptions
)
4263 flag_asynchronous_unwind_tables
= 1;
4264 if (flag_asynchronous_unwind_tables
)
4265 flag_unwind_tables
= 1;
4267 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4269 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
4270 flag_unit_at_a_time
= 0;
4272 /* Warn about options that are not supported on this machine. */
4273 #ifndef INSN_SCHEDULING
4274 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
4275 warning ("instruction scheduling not supported on this target machine");
4278 if (flag_delayed_branch
)
4279 warning ("this target machine does not have delayed branches");
4282 user_label_prefix
= USER_LABEL_PREFIX
;
4283 if (flag_leading_underscore
!= -1)
4285 /* If the default prefix is more complicated than "" or "_",
4286 issue a warning and ignore this option. */
4287 if (user_label_prefix
[0] == 0 ||
4288 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
4290 user_label_prefix
= flag_leading_underscore
? "_" : "";
4293 warning ("-f%sleading-underscore not supported on this target machine",
4294 flag_leading_underscore
? "" : "no-");
4297 /* If we are in verbose mode, write out the version and maybe all the
4298 option flags in use. */
4301 print_version (stderr
, "");
4303 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
4306 if (flag_syntax_only
)
4308 write_symbols
= NO_DEBUG
;
4312 /* Now we know write_symbols, set up the debug hooks based on it.
4313 By default we do nothing for debug output. */
4314 #if defined(DBX_DEBUGGING_INFO)
4315 if (write_symbols
== DBX_DEBUG
)
4316 debug_hooks
= &dbx_debug_hooks
;
4318 #if defined(XCOFF_DEBUGGING_INFO)
4319 if (write_symbols
== XCOFF_DEBUG
)
4320 debug_hooks
= &xcoff_debug_hooks
;
4322 #ifdef SDB_DEBUGGING_INFO
4323 if (write_symbols
== SDB_DEBUG
)
4324 debug_hooks
= &sdb_debug_hooks
;
4326 #ifdef DWARF_DEBUGGING_INFO
4327 if (write_symbols
== DWARF_DEBUG
)
4328 debug_hooks
= &dwarf_debug_hooks
;
4330 #ifdef DWARF2_DEBUGGING_INFO
4331 if (write_symbols
== DWARF2_DEBUG
)
4332 debug_hooks
= &dwarf2_debug_hooks
;
4334 #ifdef VMS_DEBUGGING_INFO
4335 if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4336 debug_hooks
= &vmsdbg_debug_hooks
;
4339 /* If auxiliary info generation is desired, open the output file.
4340 This goes in the same directory as the source file--unlike
4341 all the other output files. */
4342 if (flag_gen_aux_info
)
4344 aux_info_file
= fopen (aux_info_file_name
, "w");
4345 if (aux_info_file
== 0)
4346 fatal_error ("can't open %s: %m", aux_info_file_name
);
4349 if (! targetm
.have_named_sections
)
4351 if (flag_function_sections
)
4353 warning ("-ffunction-sections not supported for this target");
4354 flag_function_sections
= 0;
4356 if (flag_data_sections
)
4358 warning ("-fdata-sections not supported for this target");
4359 flag_data_sections
= 0;
4363 if (flag_function_sections
&& profile_flag
)
4365 warning ("-ffunction-sections disabled; it makes profiling impossible");
4366 flag_function_sections
= 0;
4369 #ifndef HAVE_prefetch
4370 if (flag_prefetch_loop_arrays
)
4372 warning ("-fprefetch-loop-arrays not supported for this target");
4373 flag_prefetch_loop_arrays
= 0;
4376 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
4378 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4379 flag_prefetch_loop_arrays
= 0;
4383 /* This combination of options isn't handled for i386 targets and doesn't
4384 make much sense anyway, so don't allow it. */
4385 if (flag_prefetch_loop_arrays
&& optimize_size
)
4387 warning ("-fprefetch-loop-arrays is not supported with -Os");
4388 flag_prefetch_loop_arrays
= 0;
4391 #ifndef OBJECT_FORMAT_ELF
4392 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
4393 warning ("-ffunction-sections may affect debugging on some targets");
4396 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4397 if (flag_signaling_nans
)
4398 flag_trapping_math
= 1;
4401 /* Initialize the compiler back end. */
4405 /* init_emit_once uses reg_raw_mode and therefore must be called
4406 after init_regs which initialized reg_raw_mode. */
4408 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
4409 || debug_info_level
== DINFO_LEVEL_VERBOSE
4410 #ifdef VMS_DEBUGGING_INFO
4411 /* Enable line number info for traceback. */
4412 || debug_info_level
> DINFO_LEVEL_NONE
4414 || flag_test_coverage
4415 || warn_notreached
);
4416 init_fake_stack_mems ();
4420 init_function_once ();
4421 init_varasm_once ();
4423 /* The following initialization functions need to generate rtl, so
4424 provide a dummy function context for them. */
4425 init_dummy_function_start ();
4427 if (flag_caller_saves
)
4428 init_caller_save ();
4429 expand_dummy_function_end ();
4432 /* Language-dependent initialization. Returns nonzero on success. */
4434 lang_dependent_init (const char *name
)
4436 if (dump_base_name
== 0)
4437 dump_base_name
= name
? name
: "gccdump";
4439 /* Other front-end initialization. */
4440 if ((*lang_hooks
.init
) () == 0)
4443 init_asm_output (name
);
4445 /* These create various _DECL nodes, so need to be called after the
4446 front end is initialized. */
4450 /* The following initialization functions need to generate rtl, so
4451 provide a dummy function context for them. */
4452 init_dummy_function_start ();
4454 expand_dummy_function_end ();
4456 /* If dbx symbol table desired, initialize writing it and output the
4457 predefined types. */
4458 timevar_push (TV_SYMOUT
);
4460 #ifdef DWARF2_UNWIND_INFO
4461 if (dwarf2out_do_frame ())
4462 dwarf2out_frame_init ();
4465 /* Now we have the correct original filename, we can initialize
4467 (*debug_hooks
->init
) (name
);
4469 timevar_pop (TV_SYMOUT
);
4474 /* Clean up: close opened files, etc. */
4479 /* Close the dump files. */
4480 if (flag_gen_aux_info
)
4482 fclose (aux_info_file
);
4484 unlink (aux_info_file_name
);
4487 /* Close non-debugging input and output files. Take special care to note
4488 whether fclose returns an error, since the pages might still be on the
4489 buffer chain while the file is open. */
4493 if (ferror (asm_out_file
) != 0)
4494 fatal_error ("error writing to %s: %m", asm_file_name
);
4495 if (fclose (asm_out_file
) != 0)
4496 fatal_error ("error closing %s: %m", asm_file_name
);
4499 /* Do whatever is necessary to finish printing the graphs. */
4500 if (graph_dump_format
!= no_graph
)
4504 for (i
= 0; i
< (int) DFI_MAX
; ++i
)
4505 if (dump_file
[i
].initialized
&& dump_file
[i
].graph_dump_p
)
4510 sprintf (seq
, DUMPFILE_FORMAT
, i
);
4511 suffix
= concat (seq
, dump_file
[i
].extension
, NULL
);
4512 finish_graph_dump_file (dump_base_name
, suffix
);
4519 ggc_print_statistics ();
4520 stringpool_statistics ();
4521 dump_tree_statistics ();
4524 /* Free up memory for the benefit of leak detectors. */
4527 /* Language-specific end of compilation actions. */
4528 (*lang_hooks
.finish
) ();
4531 /* Initialize the compiler, and compile the input file. */
4535 /* Initialize timing first. The C front ends read the main file in
4536 the post_options hook, and C++ does file timings. */
4537 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
4539 timevar_start (TV_TOTAL
);
4543 /* Don't do any more if an error has already occurred. */
4546 /* Set up the back-end if requested. */
4550 /* Language-dependent initialization. Returns true on success. */
4551 if (lang_dependent_init (main_input_filename
))
4553 if (flag_unit_at_a_time
)
4555 open_dump_file (DFI_cgraph
, NULL
);
4556 cgraph_dump_file
= rtl_dump_file
;
4557 rtl_dump_file
= NULL
;
4562 if (flag_unit_at_a_time
)
4564 rtl_dump_file
= cgraph_dump_file
;
4565 cgraph_dump_file
= NULL
;
4566 close_dump_file (DFI_cgraph
, NULL
, NULL_RTX
);
4573 /* Stop timing and print the times. */
4574 timevar_stop (TV_TOTAL
);
4575 timevar_print (stderr
);
4578 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4579 Decode command args, then call compile_file.
4580 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4581 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4583 It is not safe to call this function more than once. */
4586 toplev_main (unsigned int argc
, const char **argv
)
4590 /* Initialization of GCC's environment, and diagnostics. */
4591 general_init (argv
[0]);
4593 /* Parse the options and do minimal processing; basically just
4594 enough to default flags appropriately. */
4595 decode_options (argc
, argv
);
4599 /* Exit early if we can (e.g. -help). */
4600 if (!exit_after_options
)
4603 if (errorcount
|| sorrycount
)
4604 return (FATAL_EXIT_CODE
);
4606 return (SUCCESS_EXIT_CODE
);