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, 2004 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"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
73 #include "langhooks.h"
74 #include "cfglayout.h"
76 #include "hosthooks.h"
80 #include "value-prof.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 #ifndef HAVE_conditional_execution
100 #define HAVE_conditional_execution 0
103 /* Carry information from ASM_DECLARE_OBJECT_NAME
104 to ASM_FINISH_DECLARE_OBJECT. */
106 extern int size_directive_output;
107 extern tree last_assemble_variable_decl;
109 extern void reg_alloc (void);
111 static void general_init (const char *);
112 static void do_compile (void);
113 static void process_options (void);
114 static void backend_init (void);
115 static int lang_dependent_init (const char *);
116 static void init_asm_output (const char *);
117 static void finalize (void);
119 static void crash_signal (int) ATTRIBUTE_NORETURN;
120 static void setup_core_dumping (void);
121 static void compile_file (void);
123 static int print_single_switch (FILE *, int, int, const char *,
124 const char *, const char *,
125 const char *, const char *);
126 static void print_switch_values (FILE *, int, int, const char *,
127 const char *, const char *);
129 /* Rest of compilation helper functions. */
130 static bool rest_of_handle_inlining (tree);
131 static void rest_of_handle_cse (tree, rtx);
132 static void rest_of_handle_cse2 (tree, rtx);
133 static void rest_of_handle_gcse (tree, rtx);
134 static void rest_of_handle_life (tree, rtx);
135 static void rest_of_handle_loop_optimize (tree, rtx);
136 static void rest_of_handle_loop2 (tree, rtx);
137 static void rest_of_handle_jump_bypass (tree, rtx);
138 static void rest_of_handle_sibling_calls (rtx);
139 static void rest_of_handle_null_pointer (tree, rtx);
140 static void rest_of_handle_addressof (tree, rtx);
141 static void rest_of_handle_cfg (tree, rtx);
142 static void rest_of_handle_branch_prob (tree, rtx);
143 static void rest_of_handle_value_profile_transformations (tree, rtx);
144 static void rest_of_handle_if_conversion (tree, rtx);
145 static void rest_of_handle_if_after_combine (tree, rtx);
146 static void rest_of_handle_tracer (tree, rtx);
147 static void rest_of_handle_combine (tree, rtx);
148 static void rest_of_handle_regmove (tree, rtx);
149 #ifdef INSN_SCHEDULING
150 static void rest_of_handle_sched (tree, rtx);
151 static void rest_of_handle_sched2 (tree, rtx);
153 static bool rest_of_handle_new_regalloc (tree, rtx);
154 static bool rest_of_handle_old_regalloc (tree, rtx);
155 static void rest_of_handle_regrename (tree, rtx);
156 static void rest_of_handle_reorder_blocks (tree, rtx);
158 static void rest_of_handle_stack_regs (tree, rtx);
160 static void rest_of_handle_machine_reorg (tree, rtx);
162 static void rest_of_handle_delay_slots (tree, rtx);
164 static void rest_of_handle_final (tree, rtx);
166 /* Nonzero to dump debug info whilst parsing (-dy option). */
167 static int set_yydebug;
169 /* True if we don't need a backend (e.g. preprocessing only). */
170 static bool no_backend;
172 /* Length of line when printing switch values. */
175 /* Name of program invoked, sans directories. */
177 const char *progname;
179 /* Copy of argument vector to toplev_main. */
180 static const char **save_argv;
182 /* Name of top-level original source file (what was input to cpp).
183 This comes from the #-command at the beginning of the actual input.
184 If there isn't any there, then this is the cc1 input file name. */
186 const char *main_input_filename;
188 /* Current position in real source file. */
190 location_t input_location;
192 struct line_maps line_table;
194 /* Nonzero if it is unsafe to create any new pseudo registers. */
197 /* Stack of currently pending input files. */
199 struct file_stack *input_file_stack;
201 /* Incremented on each change to input_file_stack. */
202 int input_file_stack_tick;
204 /* Name to use as base of names for dump output files. */
206 const char *dump_base_name;
208 /* Name to use as a base for auxiliary output files. */
210 const char *aux_base_name;
212 /* Format to use to print dumpfile index value */
213 #ifndef DUMPFILE_FORMAT
214 #define DUMPFILE_FORMAT ".%02d."
217 /* Bit flags that specify the machine subtype we are compiling for.
218 Bits are tested using macros TARGET_... defined in the tm.h file
219 and set by `-m...' switches. Must be defined in rtlanal.c. */
221 extern int target_flags;
223 /* A mask of target_flags that includes bit X if X was set or cleared
224 on the command line. */
226 int target_flags_explicit;
228 /* Debug hooks - dependent upon command line options. */
230 const struct gcc_debug_hooks *debug_hooks;
232 /* Describes a dump file. */
234 struct dump_file_info
236 /* The unique extension to apply, e.g. ".jump". */
237 const char *const extension;
239 /* The -d<c> character that enables this dump file. */
240 char const debug_switch;
242 /* True if there is a corresponding graph dump file. */
243 char const graph_dump_p;
245 /* True if the user selected this dump. */
248 /* True if the files have been initialized (ie truncated). */
252 /* Enumerate the extant dump files. */
288 DFI_branch_target_load,
296 /* Describes all the dump files. Should be kept in order of the
297 pass and in sync with dump_file_index above.
299 Remaining -d letters:
305 static struct dump_file_info dump_file[DFI_MAX] =
307 { "cgraph", 'U', 0, 0, 0 },
308 { "rtl", 'r', 0, 0, 0 },
309 { "sibling", 'i', 0, 0, 0 },
310 { "eh", 'h', 0, 0, 0 },
311 { "jump", 'j', 0, 0, 0 },
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 { "vpt", 'V', 1, 0, 0 },
321 { "ce1", 'C', 1, 0, 0 },
322 { "tracer", 'T', 1, 0, 0 },
323 { "loop2", 'L', 1, 0, 0 },
324 { "web", 'Z', 0, 0, 0 },
325 { "cse2", 't', 1, 0, 0 },
326 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
327 { "combine", 'c', 1, 0, 0 },
328 { "ce2", 'C', 1, 0, 0 },
329 { "regmove", 'N', 1, 0, 0 },
330 { "sched", 'S', 1, 0, 0 },
331 { "lreg", 'l', 1, 0, 0 },
332 { "greg", 'g', 1, 0, 0 },
333 { "postreload", 'o', 1, 0, 0 },
334 { "flow2", 'w', 1, 0, 0 },
335 { "peephole2", 'z', 1, 0, 0 },
336 { "rnreg", 'n', 1, 0, 0 },
337 { "ce3", 'E', 1, 0, 0 },
338 { "bbro", 'B', 1, 0, 0 },
339 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
340 { "sched2", 'R', 1, 0, 0 },
341 { "stack", 'k', 1, 0, 0 },
342 { "mach", 'M', 1, 0, 0 },
343 { "dbr", 'd', 0, 0, 0 },
346 static int open_dump_file (enum dump_file_index, tree);
347 static void close_dump_file (enum dump_file_index,
348 void (*) (FILE *, rtx), rtx);
350 /* Other flags saying which kinds of debugging dump have been requested. */
352 int rtl_dump_and_exit;
353 int flag_print_asm_name;
354 enum graph_dump_types graph_dump_format;
356 /* Name for output file of assembly code, specified with -o. */
358 const char *asm_file_name;
360 /* Nonzero means do optimizations. -O.
361 Particular numeric values stand for particular amounts of optimization;
362 thus, -O2 stores 2 here. However, the optimizations beyond the basic
363 ones are not controlled directly by this variable. Instead, they are
364 controlled by individual `flag_...' variables that are defaulted
365 based on this variable. */
369 /* Nonzero means optimize for size. -Os.
370 The only valid values are zero and nonzero. When optimize_size is
371 nonzero, optimize defaults to 2, but certain individual code
372 bloating optimizations are disabled. */
374 int optimize_size = 0;
376 /* The FUNCTION_DECL for the function currently being compiled,
377 or 0 if between functions. */
378 tree current_function_decl;
380 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
382 tree current_function_func_begin_label;
384 /* Nonzero if doing dwarf2 duplicate elimination. */
386 int flag_eliminate_dwarf2_dups = 0;
388 /* Nonzero if doing unused type elimination. */
390 int flag_eliminate_unused_debug_types = 1;
392 /* Nonzero means emit debugging information only for symbols which are used. */
393 int flag_debug_only_used_symbols = 0;
395 /* Nonzero if generating code to do profiling. */
397 int profile_flag = 0;
399 /* Nonzero if generating code to profile program flow graph arcs. */
401 int profile_arc_flag = 0;
403 /* Nonzero if value histograms should be measured. */
405 int flag_profile_values = 0;
407 /* Nonzero if value histograms should be used to optimize code. */
408 int flag_value_profile_transformations = 0;
410 /* Nonzero if generating info for gcov to calculate line test coverage. */
412 int flag_test_coverage = 0;
414 /* Nonzero indicates that branch taken probabilities should be calculated. */
416 int flag_branch_probabilities = 0;
418 /* Nonzero if basic blocks should be reordered. */
420 int flag_reorder_blocks = 0;
422 /* Nonzero if functions should be reordered. */
424 int flag_reorder_functions = 0;
426 /* Nonzero if registers should be renamed. */
428 int flag_rename_registers = 0;
429 int flag_cprop_registers = 0;
431 /* Nonzero for -pedantic switch: warn about anything
432 that standard spec forbids. */
436 /* Temporarily suppress certain warnings.
437 This is set while reading code from a system header file. */
439 int in_system_header = 0;
441 /* Don't print functions as they are compiled. -quiet. */
445 /* Print times taken by the various passes. -ftime-report. */
449 /* Print memory still in use at end of compilation (which may have little
450 to do with peak memory consumption). -fmem-report. */
454 /* Nonzero means to collect statistics which might be expensive
455 and to print them when we are done. */
456 int flag_detailed_statistics = 0;
458 /* A random sequence of characters, unless overridden by user. */
459 const char *flag_random_seed;
461 /* A local time stamp derived from the time of compilation. It will be
462 zero if the system cannot provide a time. It will be -1u, if the
463 user has specified a particular random seed. */
468 /* Nonzero means `char' should be signed. */
470 int flag_signed_char;
472 /* Nonzero means give an enum type only as many bytes as it needs. */
474 int flag_short_enums;
476 /* Nonzero for -fcaller-saves: allocate values in regs that need to
477 be saved across function calls, if that produces overall better code.
478 Optional now, so people can test it. */
480 int flag_caller_saves = 0;
482 /* Nonzero if structures and unions should be returned in memory.
484 This should only be defined if compatibility with another compiler or
485 with an ABI is needed, because it results in slower code. */
487 #ifndef DEFAULT_PCC_STRUCT_RETURN
488 #define DEFAULT_PCC_STRUCT_RETURN 1
491 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
493 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
495 /* Nonzero for -fforce-mem: load memory value into a register
496 before arithmetic on it. This makes better cse but slower compilation. */
498 int flag_force_mem = 0;
500 /* Nonzero for -fforce-addr: load memory address into a register before
501 reference to memory. This makes better cse but slower compilation. */
503 int flag_force_addr = 0;
505 /* Nonzero for -fdefer-pop: don't pop args after each function call;
506 instead save them up to pop many calls' args with one insns. */
508 int flag_defer_pop = 0;
510 /* Nonzero for -ffloat-store: don't allocate floats and doubles
511 in extended-precision registers. */
513 int flag_float_store = 0;
515 /* Nonzero for -fcse-follow-jumps:
516 have cse follow jumps to do a more extensive job. */
518 int flag_cse_follow_jumps;
520 /* Nonzero for -fcse-skip-blocks:
521 have cse follow a branch around a block. */
522 int flag_cse_skip_blocks;
524 /* Nonzero for -fexpensive-optimizations:
525 perform miscellaneous relatively-expensive optimizations. */
526 int flag_expensive_optimizations;
528 /* Nonzero for -fthread-jumps:
529 have jump optimize output of loop. */
531 int flag_thread_jumps;
533 /* Nonzero enables strength-reduction in loop.c. */
535 int flag_strength_reduce = 0;
537 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
538 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
539 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
542 int flag_old_unroll_loops;
544 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
545 This is generally not a win. */
547 int flag_old_unroll_all_loops;
549 /* Enables unrolling of simple loops in loop-unroll.c. */
550 int flag_unroll_loops;
552 /* Enables unrolling of all loops in loop-unroll.c. */
553 int flag_unroll_all_loops;
555 /* Nonzero enables loop peeling. */
558 /* Nonzero enables loop unswitching. */
559 int flag_unswitch_loops;
561 /* Nonzero enables prefetch optimizations for arrays in loops. */
563 int flag_prefetch_loop_arrays;
565 /* Nonzero forces all invariant computations in loops to be moved
568 int flag_move_all_movables = 0;
570 /* Nonzero forces all general induction variables in loops to be
573 int flag_reduce_all_givs = 0;
575 /* Nonzero to perform full register move optimization passes. This is the
578 int flag_regmove = 0;
580 /* Nonzero for -fwritable-strings:
581 store string constants in data segment and don't uniquize them. */
583 int flag_writable_strings = 0;
585 /* Nonzero means don't put addresses of constant functions in registers.
586 Used for compiling the Unix kernel, where strange substitutions are
587 done on the assembly output. */
589 int flag_no_function_cse = 0;
591 /* Nonzero for -fomit-frame-pointer:
592 don't make a frame pointer in simple functions that don't require one. */
594 int flag_omit_frame_pointer = 0;
596 /* Nonzero means place each function into its own section on those platforms
597 which support arbitrary section names and unlimited numbers of sections. */
599 int flag_function_sections = 0;
601 /* ... and similar for data. */
603 int flag_data_sections = 0;
605 /* Nonzero to inhibit use of define_optimization peephole opts. */
607 int flag_no_peephole = 0;
609 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
611 int flag_optimize_sibling_calls = 0;
613 /* Nonzero means the front end generally wants `errno' maintained by math
614 operations, like built-in SQRT. */
616 int flag_errno_math = 1;
618 /* Nonzero means that unsafe floating-point math optimizations are allowed
619 for the sake of speed. IEEE compliance is not guaranteed, and operations
620 are allowed to assume that their arguments and results are "normal"
621 (e.g., nonnegative for SQRT). */
623 int flag_unsafe_math_optimizations = 0;
625 /* Nonzero means that no NaNs or +-Infs are expected. */
627 int flag_finite_math_only = 0;
629 /* Zero means that floating-point math operations cannot generate a
630 (user-visible) trap. This is the case, for example, in nonstop
631 IEEE 754 arithmetic. Trapping conditions include division by zero,
632 overflow, underflow, invalid and inexact, but does not include
633 operations on signaling NaNs (see below). */
635 int flag_trapping_math = 1;
637 /* Nonzero means disable transformations that assume default floating
638 point rounding behavior. */
640 int flag_rounding_math = 0;
642 /* Nonzero means disable transformations observable by signaling NaNs.
643 This option implies that any operation on an IEEE signaling NaN can
644 generate a (user-visible) trap. */
646 int flag_signaling_nans = 0;
648 /* 0 means straightforward implementation of complex divide acceptable.
649 1 means wide ranges of inputs must work for complex divide.
650 2 means C99-like requirements for complex divide (not yet implemented). */
652 int flag_complex_divide_method = 0;
654 /* Nonzero means just do syntax checking; don't output anything. */
656 int flag_syntax_only = 0;
658 /* Nonzero means performs web construction pass. */
662 /* Nonzero means perform loop optimizer. */
664 int flag_loop_optimize;
666 /* Nonzero means perform crossjumping. */
668 int flag_crossjumping;
670 /* Nonzero means perform if conversion. */
672 int flag_if_conversion;
674 /* Nonzero means perform if conversion after reload. */
676 int flag_if_conversion2;
678 /* Nonzero means to use global dataflow analysis to eliminate
679 useless null pointer tests. */
681 int flag_delete_null_pointer_checks;
683 /* Nonzero means perform global CSE. */
687 /* Nonzero means to do the enhanced load motion during gcse, which trys
688 to hoist loads by not killing them when a store to the same location
691 int flag_gcse_lm = 1;
693 /* Nonzero means to perform store motion after gcse, which will try to
694 move stores closer to the exit block. Its not very effective without
697 int flag_gcse_sm = 1;
699 /* Nonzero if we want to perfrom redundant load after store elimination
702 int flag_gcse_las = 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 /* For the bt-load pass, nonzero means don't re-use branch target registers
715 in any basic block. */
717 int flag_btr_bb_exclusive;
719 /* Nonzero means to rerun cse after loop optimization. This increases
720 compilation time about 20% and picks up a few more common expressions. */
722 int flag_rerun_cse_after_loop;
724 /* Nonzero means to run loop optimizations twice. */
726 int flag_rerun_loop_opt;
728 /* Nonzero for -finline-functions: ok to inline functions that look like
729 good inline candidates. */
731 int flag_inline_functions;
733 /* Nonzero for -fkeep-inline-functions: even if we make a function
734 go inline everywhere, keep its definition around for debugging
737 int flag_keep_inline_functions;
739 /* Nonzero means that functions will not be inlined. */
741 int flag_no_inline = 2;
743 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
744 not just because the tree inliner turned us off. */
746 int flag_really_no_inline = 2;
748 /* Nonzero means that we should emit static const variables
749 regardless of whether or not optimization is turned on. */
751 int flag_keep_static_consts = 1;
753 /* Nonzero means we should be saving declaration info into a .X file. */
755 int flag_gen_aux_info = 0;
757 /* Specified name of aux-info file. */
759 const char *aux_info_file_name;
761 /* Nonzero means make the text shared if supported. */
763 int flag_shared_data;
765 /* Nonzero means schedule into delayed branch slots if supported. */
767 int flag_delayed_branch;
769 /* Nonzero if we are compiling pure (sharable) code.
770 Value is 1 if we are doing "small" pic; value is 2 if we're doing
775 /* Nonzero if we are compiling position independent code for executable.
776 The value is 1 if we are doing "small" pic; value is 2 if we're doing
781 /* Nonzero if we are compiling code for a shared library, zero for
786 /* Set to the default thread-local storage (tls) model to use. */
788 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
790 /* Nonzero means generate extra code for exception handling and enable
791 exception handling. */
795 /* Nonzero means generate frame unwind info table when supported. */
797 int flag_unwind_tables = 0;
799 /* Nonzero means generate frame unwind info table exact at each insn
802 int flag_asynchronous_unwind_tables = 0;
804 /* Nonzero means don't place uninitialized global data in common storage
809 /* Nonzero means change certain warnings into errors.
810 Usually these are warnings about failure to conform to some standard. */
812 int flag_pedantic_errors = 0;
814 /* flag_schedule_insns means schedule insns within basic blocks (before
816 flag_schedule_insns_after_reload means schedule insns after
819 int flag_schedule_insns = 0;
820 int flag_schedule_insns_after_reload = 0;
822 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
823 int flag_sched2_use_superblocks = 0;
825 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
827 int flag_sched2_use_traces = 0;
829 /* The following flags have effect only for scheduling before register
832 flag_schedule_interblock means schedule insns across basic blocks.
833 flag_schedule_speculative means allow speculative motion of non-load insns.
834 flag_schedule_speculative_load means allow speculative motion of some
836 flag_schedule_speculative_load_dangerous allows speculative motion of more
839 int flag_schedule_interblock = 1;
840 int flag_schedule_speculative = 1;
841 int flag_schedule_speculative_load = 0;
842 int flag_schedule_speculative_load_dangerous = 0;
844 /* The following flags have an effect during scheduling after register
847 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
848 of stalled insns into the ready list.
850 flag_sched_stalled_insns_dep controls how many insn groups will be examined
851 for a dependency on a stalled insn that is candidate for premature removal
852 from the queue of stalled insns into the ready list (has an effect only if
853 the flag 'sched_stalled_insns' is set). */
855 int flag_sched_stalled_insns = 0;
856 int flag_sched_stalled_insns_dep = 1;
858 int flag_single_precision_constant;
860 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
861 by a cheaper branch on a count register. */
862 int flag_branch_on_count_reg = 1;
864 /* -finhibit-size-directive inhibits output of .size for ELF.
865 This is used only for compiling crtstuff.c,
866 and it may be extended to other effects
867 needed for crtstuff.c on other systems. */
868 int flag_inhibit_size_directive = 0;
870 /* -fverbose-asm causes extra commentary information to be produced in
871 the generated assembly code (to make it more readable). This option
872 is generally only of use to those who actually need to read the
873 generated assembly code (perhaps while debugging the compiler itself).
874 -fno-verbose-asm, the default, causes the extra information
875 to be omitted and is useful when comparing two assembler files. */
877 int flag_verbose_asm = 0;
879 /* -dA causes debug commentary information to be produced in
880 the generated assembly code (to make it more readable). This option
881 is generally only of use to those who actually need to read the
882 generated assembly code (perhaps while debugging the compiler itself).
883 Currently, this switch is only used by dwarfout.c; however, it is intended
884 to be a catchall for printing debug information in the assembler file. */
886 int flag_debug_asm = 0;
888 /* -dP causes the rtl to be emitted as a comment in assembly. */
890 int flag_dump_rtl_in_asm = 0;
892 /* Nonzero means put zero initialized data in the bss section. */
893 int flag_zero_initialized_in_bss = 1;
895 /* Tag all structures with __attribute__(packed). */
896 int flag_pack_struct = 0;
898 /* Emit code to check for stack overflow; also may cause large objects
899 to be allocated dynamically. */
900 int flag_stack_check;
902 /* When non-NULL, indicates that whenever space is allocated on the
903 stack, the resulting stack pointer must not pass this
904 address---that is, for stacks that grow downward, the stack pointer
905 must always be greater than or equal to this address; for stacks
906 that grow upward, the stack pointer must be less than this address.
907 At present, the rtx may be either a REG or a SYMBOL_REF, although
908 the support provided depends on the backend. */
911 /* 0 if pointer arguments may alias each other. True in C.
912 1 if pointer arguments may not alias each other but may alias
914 2 if pointer arguments may not alias each other and may not
915 alias global variables. True in Fortran.
916 This defaults to 0 for C. */
917 int flag_argument_noalias = 0;
919 /* Nonzero if we should do (language-dependent) alias analysis.
920 Typically, this analysis will assume that expressions of certain
921 types do not alias expressions of certain other types. Only used
922 if alias analysis (in general) is enabled. */
923 int flag_strict_aliasing = 0;
925 /* Instrument functions with calls at entry and exit, for profiling. */
926 int flag_instrument_function_entry_exit = 0;
928 /* Nonzero means ignore `#ident' directives. 0 means handle them.
929 On SVR4 targets, it also controls whether or not to emit a
930 string identifying the compiler. */
932 int flag_no_ident = 0;
934 /* This will perform a peephole pass before sched2. */
935 int flag_peephole2 = 0;
937 /* This will try to guess branch probabilities. */
938 int flag_guess_branch_prob = 0;
940 /* -fcheck-bounds causes gcc to generate array bounds checks.
941 For C, C++, ObjC: defaults to off.
942 For Java: defaults to on.
943 For Fortran: defaults to off. */
944 int flag_bounds_check = 0;
946 /* This will attempt to merge constant section constants, if 1 only
947 string constants and constants from constant pool, if 2 also constant
949 int flag_merge_constants = 1;
951 /* If one, renumber instruction UIDs to reduce the number of
952 unused UIDs if there are a lot of instructions. If greater than
953 one, unconditionally renumber instruction UIDs. */
954 int flag_renumber_insns = 1;
956 /* If nonzero, use the graph coloring register allocator. */
957 int flag_new_regalloc = 0;
959 /* Nonzero if we perform superblock formation. */
963 /* Nonzero if we perform whole unit at a time compilation. */
965 int flag_unit_at_a_time = 0;
967 /* Values of the -falign-* flags: how much to align labels in code.
968 0 means `use default', 1 means `don't align'.
969 For each variable, there is an _log variant which is the power
970 of two not less than the variable, for .align output. */
974 int align_loops_max_skip;
977 int align_jumps_max_skip;
979 int align_labels_log;
980 int align_labels_max_skip;
982 int align_functions_log;
984 /* Like align_functions_log above, but used by front-ends to force the
985 minimum function alignment. Zero means no alignment is forced. */
986 int force_align_functions_log;
990 const char *const string;
994 lang_independent_options;
996 /* Nonzero if signed arithmetic overflow should trap. */
999 /* Nonzero if signed arithmetic overflow should wrap around. */
1002 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1003 int flag_evaluation_order = 0;
1005 /* Add or remove a leading underscore from user symbols. */
1006 int flag_leading_underscore = -1;
1008 /* The user symbol prefix after having resolved same. */
1009 const char *user_label_prefix;
1011 static const param_info lang_independent_params[] = {
1012 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1013 { OPTION, DEFAULT, HELP },
1014 #include "params.def"
1019 /* Table of language-independent -f options.
1020 STRING is the option name. VARIABLE is the address of the variable.
1021 ON_VALUE is the value to store in VARIABLE
1022 if `-fSTRING' is seen as an option.
1023 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1025 static const lang_independent_options f_options[] =
1027 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1028 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1029 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1030 {"float-store", &flag_float_store, 1 },
1031 {"defer-pop", &flag_defer_pop, 1 },
1032 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1033 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1034 {"tracer", &flag_tracer, 1 },
1035 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1036 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1037 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1038 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1039 {"thread-jumps", &flag_thread_jumps, 1 },
1040 {"strength-reduce", &flag_strength_reduce, 1 },
1041 {"unroll-loops", &flag_unroll_loops, 1 },
1042 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1043 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1044 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1045 {"peel-loops", &flag_peel_loops, 1 },
1046 {"unswitch-loops", &flag_unswitch_loops, 1 },
1047 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1048 {"move-all-movables", &flag_move_all_movables, 1 },
1049 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1050 {"writable-strings", &flag_writable_strings, 1 },
1051 {"peephole", &flag_no_peephole, 0 },
1052 {"force-mem", &flag_force_mem, 1 },
1053 {"force-addr", &flag_force_addr, 1 },
1054 {"function-cse", &flag_no_function_cse, 0 },
1055 {"inline-functions", &flag_inline_functions, 1 },
1056 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1057 {"inline", &flag_no_inline, 0 },
1058 {"keep-static-consts", &flag_keep_static_consts, 1 },
1059 {"syntax-only", &flag_syntax_only, 1 },
1060 {"shared-data", &flag_shared_data, 1 },
1061 {"caller-saves", &flag_caller_saves, 1 },
1062 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1063 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1064 {"delayed-branch", &flag_delayed_branch, 1 },
1065 {"web", &flag_web, 1},
1066 {"gcse", &flag_gcse, 1 },
1067 {"gcse-lm", &flag_gcse_lm, 1 },
1068 {"gcse-sm", &flag_gcse_sm, 1 },
1069 {"gcse-las", &flag_gcse_las, 1 },
1070 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1071 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1072 {"btr-bb-exclusive", &flag_btr_bb_exclusive, 1 },
1073 {"loop-optimize", &flag_loop_optimize, 1 },
1074 {"crossjumping", &flag_crossjumping, 1 },
1075 {"if-conversion", &flag_if_conversion, 1 },
1076 {"if-conversion2", &flag_if_conversion2, 1 },
1077 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1078 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1079 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1080 {"schedule-insns", &flag_schedule_insns, 1 },
1081 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1082 {"sched-interblock",&flag_schedule_interblock, 1 },
1083 {"sched-spec",&flag_schedule_speculative, 1 },
1084 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1085 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1086 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1087 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1088 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1089 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1090 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1091 {"pic", &flag_pic, 1 },
1092 {"PIC", &flag_pic, 2 },
1093 {"pie", &flag_pie, 1 },
1094 {"PIE", &flag_pie, 2 },
1095 {"exceptions", &flag_exceptions, 1 },
1096 {"unwind-tables", &flag_unwind_tables, 1 },
1097 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1098 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1099 {"profile-arcs", &profile_arc_flag, 1 },
1100 {"profile-values", &flag_profile_values, 1 },
1101 {"vpt", &flag_value_profile_transformations, 1 },
1102 {"test-coverage", &flag_test_coverage, 1 },
1103 {"branch-probabilities", &flag_branch_probabilities, 1 },
1104 {"profile", &profile_flag, 1 },
1105 {"reorder-blocks", &flag_reorder_blocks, 1 },
1106 {"reorder-functions", &flag_reorder_functions, 1 },
1107 {"rename-registers", &flag_rename_registers, 1 },
1108 {"cprop-registers", &flag_cprop_registers, 1 },
1109 {"common", &flag_no_common, 0 },
1110 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1111 {"function-sections", &flag_function_sections, 1 },
1112 {"data-sections", &flag_data_sections, 1 },
1113 {"verbose-asm", &flag_verbose_asm, 1 },
1114 {"regmove", &flag_regmove, 1 },
1115 {"optimize-register-move", &flag_regmove, 1 },
1116 {"pack-struct", &flag_pack_struct, 1 },
1117 {"stack-check", &flag_stack_check, 1 },
1118 {"argument-alias", &flag_argument_noalias, 0 },
1119 {"argument-noalias", &flag_argument_noalias, 1 },
1120 {"argument-noalias-global", &flag_argument_noalias, 2 },
1121 {"strict-aliasing", &flag_strict_aliasing, 1 },
1122 {"align-loops", &align_loops, 0 },
1123 {"align-jumps", &align_jumps, 0 },
1124 {"align-labels", &align_labels, 0 },
1125 {"align-functions", &align_functions, 0 },
1126 {"merge-constants", &flag_merge_constants, 1 },
1127 {"merge-all-constants", &flag_merge_constants, 2 },
1128 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1129 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1130 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1131 {"leading-underscore", &flag_leading_underscore, 1 },
1132 {"ident", &flag_no_ident, 0 },
1133 { "peephole2", &flag_peephole2, 1 },
1134 {"finite-math-only", &flag_finite_math_only, 1 },
1135 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1136 {"math-errno", &flag_errno_math, 1 },
1137 {"trapping-math", &flag_trapping_math, 1 },
1138 {"rounding-math", &flag_rounding_math, 1 },
1139 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1140 {"signaling-nans", &flag_signaling_nans, 1 },
1141 {"bounds-check", &flag_bounds_check, 1 },
1142 {"single-precision-constant", &flag_single_precision_constant, 1 },
1143 {"time-report", &time_report, 1 },
1144 {"mem-report", &mem_report, 1 },
1145 { "trapv", &flag_trapv, 1 },
1146 { "wrapv", &flag_wrapv, 1 },
1147 { "new-ra", &flag_new_regalloc, 1 }
1150 /* Here is a table, controlled by the tm.h file, listing each -m switch
1151 and which bits in `target_switches' it should set or clear.
1152 If VALUE is positive, it is bits to set.
1153 If VALUE is negative, -VALUE is bits to clear.
1154 (The sign bit is not used so there is no confusion.) */
1158 const char *const name;
1160 const char *const description;
1162 target_switches[] = TARGET_SWITCHES;
1164 /* This table is similar, but allows the switch to have a value. */
1166 #ifdef TARGET_OPTIONS
1169 const char *const prefix;
1170 const char **const variable;
1171 const char *const description;
1172 const char *const value;
1174 target_options[] = TARGET_OPTIONS;
1177 /* Nonzero means warn about function definitions that default the return type
1178 or that use a null return and have a return-type other than void. */
1180 int warn_return_type;
1182 /* Output files for assembler code (real compiler output)
1183 and debugging dumps. */
1186 FILE *aux_info_file;
1187 FILE *rtl_dump_file = NULL;
1188 FILE *cgraph_dump_file = NULL;
1190 /* The current working directory of a translation. It's generally the
1191 directory from which compilation was initiated, but a preprocessed
1192 file may specify the original directory in which it was
1195 static const char *src_pwd;
1197 /* Initialize src_pwd with the given string, and return true. If it
1198 was already initialized, return false. As a special case, it may
1199 be called with a NULL argument to test whether src_pwd has NOT been
1203 set_src_pwd (const char *pwd)
1208 src_pwd = xstrdup (pwd);
1212 /* Return the directory from which the translation unit was initiated,
1213 in case set_src_pwd() was not called before to assign it a
1220 src_pwd = getpwd ();
1225 /* Called when the start of a function definition is parsed,
1226 this function prints on stderr the name of the function. */
1228 announce_function (tree decl)
1232 if (rtl_dump_and_exit)
1233 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1235 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1237 pp_needs_newline (global_dc->printer) = true;
1238 diagnostic_set_last_function (global_dc);
1242 /* Set up a default flag_random_seed and local_tick, unless the user
1243 already specified one. */
1248 if (!flag_random_seed)
1250 unsigned HOST_WIDE_INT value;
1251 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1253 /* Get some more or less random data. */
1254 #ifdef HAVE_GETTIMEOFDAY
1258 gettimeofday (&tv, NULL);
1259 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1263 time_t now = time (NULL);
1265 if (now != (time_t)-1)
1266 local_tick = (unsigned) now;
1269 value = local_tick ^ getpid ();
1271 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1272 flag_random_seed = random_seed;
1274 else if (!local_tick)
1279 /* Decode the string P as an integral parameter.
1280 If the string is indeed an integer return its numeric value else
1281 issue an Invalid Option error for the option PNAME and return DEFVAL.
1282 If PNAME is zero just return DEFVAL, do not call error. */
1285 read_integral_parameter (const char *p, const char *pname, const int defval)
1287 const char *endp = p;
1291 if (ISDIGIT (*endp))
1300 error ("invalid option argument `%s'", pname);
1307 /* Return the logarithm of X, base 2, considering X unsigned,
1308 if X is a power of 2. Otherwise, returns -1.
1310 This should be used via the `exact_log2' macro. */
1313 exact_log2_wide (unsigned HOST_WIDE_INT x)
1316 /* Test for 0 or a power of 2. */
1317 if (x == 0 || x != (x & -x))
1319 while ((x >>= 1) != 0)
1324 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1325 If X is 0, return -1.
1327 This should be used via the floor_log2 macro. */
1330 floor_log2_wide (unsigned HOST_WIDE_INT x)
1339 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1340 into ICE messages, which is much more user friendly. In case the
1341 error printer crashes, reset the signal to prevent infinite recursion. */
1344 crash_signal (int signo)
1346 signal (signo, SIG_DFL);
1347 internal_error ("%s", strsignal (signo));
1350 /* Arrange to dump core on error. (The regular error message is still
1351 printed first, except in the case of abort().) */
1354 setup_core_dumping (void)
1357 signal (SIGABRT, SIG_DFL);
1359 #if defined(HAVE_SETRLIMIT)
1362 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1363 fatal_error ("getting core file size maximum limit: %m");
1364 rlim.rlim_cur = rlim.rlim_max;
1365 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1366 fatal_error ("setting core file size limit to maximum: %m");
1369 diagnostic_abort_on_error (global_dc);
1373 /* Strip off a legitimate source ending from the input string NAME of
1374 length LEN. Rather than having to know the names used by all of
1375 our front ends, we strip off an ending of a period followed by
1376 up to five characters. (Java uses ".class".) */
1379 strip_off_ending (char *name, int len)
1382 for (i = 2; i < 6 && len > i; i++)
1384 if (name[len - i] == '.')
1386 name[len - i] = '\0';
1392 /* Output a quoted string. */
1395 output_quoted_string (FILE *asm_file, const char *string)
1397 #ifdef OUTPUT_QUOTED_STRING
1398 OUTPUT_QUOTED_STRING (asm_file, string);
1402 putc ('\"', asm_file);
1403 while ((c = *string++) != 0)
1407 if (c == '\"' || c == '\\')
1408 putc ('\\', asm_file);
1412 fprintf (asm_file, "\\%03o", (unsigned char) c);
1414 putc ('\"', asm_file);
1418 /* Output a file name in the form wanted by System V. */
1421 output_file_directive (FILE *asm_file, const char *input_name)
1426 if (input_name == NULL)
1427 input_name = "<stdin>";
1429 len = strlen (input_name);
1430 na = input_name + len;
1432 /* NA gets INPUT_NAME sans directory names. */
1433 while (na > input_name)
1435 if (IS_DIR_SEPARATOR (na[-1]))
1440 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1441 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1443 fprintf (asm_file, "\t.file\t");
1444 output_quoted_string (asm_file, na);
1445 fputc ('\n', asm_file);
1449 /* Routine to open a dump file. Return true if the dump file is enabled. */
1452 open_dump_file (enum dump_file_index index, tree decl)
1455 const char *open_arg;
1458 if (! dump_file[index].enabled)
1461 timevar_push (TV_DUMP);
1462 if (rtl_dump_file != NULL)
1463 fclose (rtl_dump_file);
1465 sprintf (seq, DUMPFILE_FORMAT, index);
1467 if (! dump_file[index].initialized)
1469 /* If we've not initialized the files, do so now. */
1470 if (graph_dump_format != no_graph
1471 && dump_file[index].graph_dump_p)
1473 dump_name = concat (seq, dump_file[index].extension, NULL);
1474 clean_graph_dump_file (dump_base_name, dump_name);
1477 dump_file[index].initialized = 1;
1483 dump_name = concat (dump_base_name, seq,
1484 dump_file[index].extension, NULL);
1486 rtl_dump_file = fopen (dump_name, open_arg);
1487 if (rtl_dump_file == NULL)
1488 fatal_error ("can't open %s: %m", dump_name);
1493 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1494 (*lang_hooks.decl_printable_name) (decl, 2),
1495 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1497 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1498 ? " (unlikely executed)"
1501 timevar_pop (TV_DUMP);
1505 /* Routine to close a dump file. */
1508 close_dump_file (enum dump_file_index index,
1509 void (*func) (FILE *, rtx),
1512 if (! rtl_dump_file)
1515 timevar_push (TV_DUMP);
1517 && graph_dump_format != no_graph
1518 && dump_file[index].graph_dump_p)
1523 sprintf (seq, DUMPFILE_FORMAT, index);
1524 suffix = concat (seq, dump_file[index].extension, NULL);
1525 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1530 func (rtl_dump_file, insns);
1532 fflush (rtl_dump_file);
1533 fclose (rtl_dump_file);
1535 rtl_dump_file = NULL;
1536 timevar_pop (TV_DUMP);
1539 /* Do any final processing required for the declarations in VEC, of
1540 which there are LEN. We write out inline functions and variables
1541 that have been deferred until this point, but which are required.
1542 Returns nonzero if anything was put out. */
1545 wrapup_global_declarations (tree *vec, int len)
1550 int output_something = 0;
1552 for (i = 0; i < len; i++)
1556 /* We're not deferring this any longer. Assignment is
1557 conditional to avoid needlessly dirtying PCH pages. */
1558 if (DECL_DEFER_OUTPUT (decl) != 0)
1559 DECL_DEFER_OUTPUT (decl) = 0;
1561 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1562 (*lang_hooks.finish_incomplete_decl) (decl);
1565 /* Now emit any global variables or functions that we have been
1566 putting off. We need to loop in case one of the things emitted
1567 here references another one which comes earlier in the list. */
1571 for (i = 0; i < len; i++)
1575 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1578 /* Don't write out static consts, unless we still need them.
1580 We also keep static consts if not optimizing (for debugging),
1581 unless the user specified -fno-keep-static-consts.
1582 ??? They might be better written into the debug information.
1583 This is possible when using DWARF.
1585 A language processor that wants static constants to be always
1586 written out (even if it is not used) is responsible for
1587 calling rest_of_decl_compilation itself. E.g. the C front-end
1588 calls rest_of_decl_compilation from finish_decl.
1589 One motivation for this is that is conventional in some
1590 environments to write things like:
1591 static const char rcsid[] = "... version string ...";
1592 intending to force the string to be in the executable.
1594 A language processor that would prefer to have unneeded
1595 static constants "optimized away" would just defer writing
1596 them out until here. E.g. C++ does this, because static
1597 constants are often defined in header files.
1599 ??? A tempting alternative (for both C and C++) would be
1600 to force a constant to be written if and only if it is
1601 defined in a main file, as opposed to an include file. */
1603 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1607 if (flag_unit_at_a_time
1608 && cgraph_varpool_node (decl)->finalized)
1610 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1611 && (TREE_USED (decl)
1612 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1614 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1616 else if (DECL_COMDAT (decl))
1618 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1619 && (optimize || !flag_keep_static_consts
1620 || DECL_ARTIFICIAL (decl)))
1626 rest_of_decl_compilation (decl, NULL, 1, 1);
1630 if (TREE_CODE (decl) == FUNCTION_DECL
1631 && DECL_INITIAL (decl) != 0
1632 && DECL_SAVED_INSNS (decl) != 0
1633 && DECL_SAVED_INSNS (decl)->saved_for_inline
1634 && (flag_keep_inline_functions
1635 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1636 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1639 output_inline_function (decl);
1644 output_something = 1;
1648 return output_something;
1651 /* Issue appropriate warnings for the global declarations in VEC (of
1652 which there are LEN). Output debugging information for them. */
1655 check_global_declarations (tree *vec, int len)
1660 for (i = 0; i < len; i++)
1664 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1665 && ! TREE_ASM_WRITTEN (decl))
1666 /* Cancel the RTL for this decl so that, if debugging info
1667 output for global variables is still to come,
1668 this one will be omitted. */
1669 SET_DECL_RTL (decl, NULL_RTX);
1671 /* Warn about any function
1672 declared static but not defined.
1673 We don't warn about variables,
1674 because many programs have static variables
1675 that exist only to get some text into the object file. */
1676 if (TREE_CODE (decl) == FUNCTION_DECL
1677 && (warn_unused_function
1678 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1679 && DECL_INITIAL (decl) == 0
1680 && DECL_EXTERNAL (decl)
1681 && ! DECL_ARTIFICIAL (decl)
1682 && ! TREE_PUBLIC (decl))
1684 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1685 pedwarn ("%J'%F' used but never defined", decl, decl);
1687 warning ("%J'%F' declared `static' but never defined", decl, decl);
1688 /* This symbol is effectively an "extern" declaration now. */
1689 TREE_PUBLIC (decl) = 1;
1690 assemble_external (decl);
1693 /* Warn about static fns or vars defined but not used. */
1694 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1695 /* We don't warn about "static const" variables because the
1696 "rcs_id" idiom uses that construction. */
1697 || (warn_unused_variable
1698 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1699 && ! DECL_IN_SYSTEM_HEADER (decl)
1700 && ! TREE_USED (decl)
1701 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1702 to handle multiple external decls in different scopes. */
1703 && ! TREE_USED (DECL_NAME (decl))
1704 && ! DECL_EXTERNAL (decl)
1705 && ! TREE_PUBLIC (decl)
1706 /* A volatile variable might be used in some non-obvious way. */
1707 && ! TREE_THIS_VOLATILE (decl)
1708 /* Global register variables must be declared to reserve them. */
1709 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1710 /* Otherwise, ask the language. */
1711 && (*lang_hooks.decls.warn_unused_global) (decl))
1712 warning ("%J'%D' defined but not used", decl, decl);
1714 /* Avoid confusing the debug information machinery when there are
1716 if (errorcount == 0 && sorrycount == 0)
1718 timevar_push (TV_SYMOUT);
1719 (*debug_hooks->global_decl) (decl);
1720 timevar_pop (TV_SYMOUT);
1725 /* Warn about a use of an identifier which was marked deprecated. */
1727 warn_deprecated_use (tree node)
1729 if (node == 0 || !warn_deprecated_decl)
1733 warning ("`%s' is deprecated (declared at %s:%d)",
1734 IDENTIFIER_POINTER (DECL_NAME (node)),
1735 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1736 else if (TYPE_P (node))
1738 const char *what = NULL;
1739 tree decl = TYPE_STUB_DECL (node);
1741 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1742 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1743 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1744 && DECL_NAME (TYPE_NAME (node)))
1745 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1750 warning ("`%s' is deprecated (declared at %s:%d)", what,
1751 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1753 warning ("`%s' is deprecated", what);
1756 warning ("type is deprecated (declared at %s:%d)",
1757 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1759 warning ("type is deprecated");
1763 /* Save the current INPUT_LOCATION on the top entry in the
1764 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1765 INPUT_LOCATION accordingly. */
1768 push_srcloc (const char *file, int line)
1770 struct file_stack *fs;
1772 fs = xmalloc (sizeof (struct file_stack));
1773 fs->location = input_location;
1774 fs->next = input_file_stack;
1775 input_filename = file;
1777 input_file_stack = fs;
1778 input_file_stack_tick++;
1781 /* Pop the top entry off the stack of presently open source files.
1782 Restore the INPUT_LOCATION from the new topmost entry on the
1788 struct file_stack *fs;
1790 fs = input_file_stack;
1791 input_location = fs->location;
1792 input_file_stack = fs->next;
1794 input_file_stack_tick++;
1797 /* Compile an entire translation unit. Write a file of assembly
1798 output and various debugging dumps. */
1803 /* Initialize yet another pass. */
1805 init_final (main_input_filename);
1806 coverage_init (aux_base_name);
1808 timevar_push (TV_PARSE);
1810 /* Call the parser, which parses the entire file (calling
1811 rest_of_compilation for each function). */
1812 (*lang_hooks.parse_file) (set_yydebug);
1814 /* In case there were missing block closers,
1815 get us back to the global binding level. */
1816 (*lang_hooks.clear_binding_stack) ();
1818 /* Compilation is now finished except for writing
1819 what's left of the symbol table output. */
1820 timevar_pop (TV_PARSE);
1822 if (flag_syntax_only)
1825 (*lang_hooks.decls.final_write_globals)();
1827 cgraph_varpool_assemble_pending_decls ();
1829 /* This must occur after the loop to output deferred functions.
1830 Else the coverage initializer would not be emitted if all the
1831 functions in this compilation unit were deferred. */
1834 /* Write out any pending weak symbol declarations. */
1838 /* Do dbx symbols. */
1839 timevar_push (TV_SYMOUT);
1841 #ifdef DWARF2_UNWIND_INFO
1842 if (dwarf2out_do_frame ())
1843 dwarf2out_frame_finish ();
1846 (*debug_hooks->finish) (main_input_filename);
1847 timevar_pop (TV_SYMOUT);
1849 /* Output some stuff at end of file if nec. */
1851 dw2_output_indirect_constants ();
1853 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1855 timevar_push (TV_DUMP);
1856 open_dump_file (DFI_bp, NULL);
1860 close_dump_file (DFI_bp, NULL, NULL_RTX);
1861 timevar_pop (TV_DUMP);
1864 targetm.asm_out.file_end ();
1866 /* Attach a special .ident directive to the end of the file to identify
1867 the version of GCC which compiled this code. The format of the .ident
1868 string is patterned after the ones produced by native SVR4 compilers. */
1871 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1872 IDENT_ASM_OP, version_string);
1875 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1877 timevar_push (TV_DUMP);
1878 dump_combine_total_stats (rtl_dump_file);
1879 close_dump_file (DFI_combine, NULL, NULL_RTX);
1880 timevar_pop (TV_DUMP);
1884 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1885 and TYPE_DECL nodes.
1887 This does nothing for local (non-static) variables, unless the
1888 variable is a register variable with an ASMSPEC. In that case, or
1889 if the variable is not an automatic, it sets up the RTL and
1890 outputs any assembler code (label definition, storage allocation
1891 and initialization).
1893 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1894 the assembler symbol name to be used. TOP_LEVEL is nonzero
1895 if this declaration is not within a function. */
1898 rest_of_decl_compilation (tree decl,
1899 const char *asmspec,
1903 /* We deferred calling assemble_alias so that we could collect
1904 other attributes such as visibility. Emit the alias now. */
1907 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1910 alias = TREE_VALUE (TREE_VALUE (alias));
1911 alias = get_identifier (TREE_STRING_POINTER (alias));
1912 assemble_alias (decl, alias);
1916 /* Forward declarations for nested functions are not "external",
1917 but we need to treat them as if they were. */
1918 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1919 || TREE_CODE (decl) == FUNCTION_DECL)
1921 timevar_push (TV_VARCONST);
1924 make_decl_rtl (decl, asmspec);
1926 /* Don't output anything when a tentative file-scope definition
1927 is seen. But at end of compilation, do output code for them.
1929 We do output all variables when unit-at-a-time is active and rely on
1930 callgraph code to defer them except for forward declarations
1931 (see gcc.c-torture/compile/920624-1.c) */
1933 || !DECL_DEFER_OUTPUT (decl)
1934 || (flag_unit_at_a_time && DECL_INITIAL (decl)))
1935 && !DECL_EXTERNAL (decl))
1937 if (flag_unit_at_a_time && !cgraph_global_info_ready
1938 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1939 cgraph_varpool_finalize_decl (decl);
1941 assemble_variable (decl, top_level, at_end, 0);
1944 #ifdef ASM_FINISH_DECLARE_OBJECT
1945 if (decl == last_assemble_variable_decl)
1947 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1952 timevar_pop (TV_VARCONST);
1954 else if (DECL_REGISTER (decl) && asmspec != 0)
1956 if (decode_reg_name (asmspec) >= 0)
1958 SET_DECL_RTL (decl, NULL_RTX);
1959 make_decl_rtl (decl, asmspec);
1963 error ("invalid register name `%s' for register variable", asmspec);
1964 DECL_REGISTER (decl) = 0;
1969 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1970 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1971 && TREE_CODE (decl) == TYPE_DECL)
1973 timevar_push (TV_SYMOUT);
1974 dbxout_symbol (decl, 0);
1975 timevar_pop (TV_SYMOUT);
1978 #ifdef SDB_DEBUGGING_INFO
1979 else if (write_symbols == SDB_DEBUG && top_level
1980 && TREE_CODE (decl) == TYPE_DECL)
1982 timevar_push (TV_SYMOUT);
1983 sdbout_symbol (decl, 0);
1984 timevar_pop (TV_SYMOUT);
1987 #ifdef DWARF2_DEBUGGING_INFO
1988 else if ((write_symbols == DWARF2_DEBUG
1989 || write_symbols == VMS_AND_DWARF2_DEBUG)
1991 && TREE_CODE (decl) == TYPE_DECL)
1993 timevar_push (TV_SYMOUT);
1994 dwarf2out_decl (decl);
1995 timevar_pop (TV_SYMOUT);
2000 /* Called after finishing a record, union or enumeral type. */
2003 rest_of_type_compilation (
2004 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2005 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2009 tree type ATTRIBUTE_UNUSED,
2010 int toplev ATTRIBUTE_UNUSED
2014 /* Avoid confusing the debug information machinery when there are
2016 if (errorcount != 0 || sorrycount != 0)
2019 timevar_push (TV_SYMOUT);
2020 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2021 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2022 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2024 #ifdef SDB_DEBUGGING_INFO
2025 if (write_symbols == SDB_DEBUG)
2026 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2028 #ifdef DWARF2_DEBUGGING_INFO
2029 if ((write_symbols == DWARF2_DEBUG
2030 || write_symbols == VMS_AND_DWARF2_DEBUG)
2032 dwarf2out_decl (TYPE_STUB_DECL (type));
2034 timevar_pop (TV_SYMOUT);
2037 /* Turn the RTL into assembly. */
2039 rest_of_handle_final (tree decl, rtx insns)
2041 timevar_push (TV_FINAL);
2046 /* Get the function's name, as described by its RTL. This may be
2047 different from the DECL_NAME name used in the source file. */
2049 x = DECL_RTL (decl);
2050 if (GET_CODE (x) != MEM)
2053 if (GET_CODE (x) != SYMBOL_REF)
2055 fnname = XSTR (x, 0);
2057 assemble_start_function (decl, fnname);
2058 final_start_function (insns, asm_out_file, optimize);
2059 final (insns, asm_out_file, optimize, 0);
2060 final_end_function ();
2062 #ifdef IA64_UNWIND_INFO
2063 /* ??? The IA-64 ".handlerdata" directive must be issued before
2064 the ".endp" directive that closes the procedure descriptor. */
2065 output_function_exception_table ();
2068 assemble_end_function (decl, fnname);
2070 #ifndef IA64_UNWIND_INFO
2071 /* Otherwise, it feels unclean to switch sections in the middle. */
2072 output_function_exception_table ();
2076 fflush (asm_out_file);
2078 /* Release all memory allocated by flow. */
2079 free_basic_block_vars (0);
2081 /* Release all memory held by regsets now. */
2082 regset_release_memory ();
2084 timevar_pop (TV_FINAL);
2090 /* Run delay slot optimization. */
2092 rest_of_handle_delay_slots (tree decl, rtx insns)
2094 timevar_push (TV_DBR_SCHED);
2095 open_dump_file (DFI_dbr, decl);
2097 dbr_schedule (insns, rtl_dump_file);
2099 close_dump_file (DFI_dbr, print_rtl, insns);
2100 timevar_pop (TV_DBR_SCHED);
2107 /* Convert register usage from flat register file usage to a stack
2110 rest_of_handle_stack_regs (tree decl, rtx insns)
2112 #if defined (HAVE_ATTR_length)
2113 /* If flow2 creates new instructions which need splitting
2114 and scheduling after reload is not done, they might not be
2115 split until final which doesn't allow splitting
2116 if HAVE_ATTR_length. */
2117 #ifdef INSN_SCHEDULING
2118 if (optimize && !flag_schedule_insns_after_reload)
2123 timevar_push (TV_SHORTEN_BRANCH);
2124 split_all_insns (1);
2125 timevar_pop (TV_SHORTEN_BRANCH);
2129 timevar_push (TV_REG_STACK);
2130 open_dump_file (DFI_stack, decl);
2132 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2134 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2135 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2136 && flag_reorder_blocks)
2138 reorder_basic_blocks ();
2139 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2143 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2144 timevar_pop (TV_REG_STACK);
2151 /* Machine independent reorg pass. */
2153 rest_of_handle_machine_reorg (tree decl, rtx insns)
2155 timevar_push (TV_MACH_DEP);
2156 open_dump_file (DFI_mach, decl);
2158 (*targetm.machine_dependent_reorg) ();
2160 close_dump_file (DFI_mach, print_rtl, insns);
2161 timevar_pop (TV_MACH_DEP);
2167 /* Run new register allocator. Return TRUE if we must exit
2168 rest_of_compilation upon return. */
2170 rest_of_handle_new_regalloc (tree decl, rtx insns)
2174 delete_trivially_dead_insns (insns, max_reg_num ());
2177 timevar_pop (TV_LOCAL_ALLOC);
2178 if (dump_file[DFI_lreg].enabled)
2180 timevar_push (TV_DUMP);
2182 close_dump_file (DFI_lreg, NULL, NULL);
2183 timevar_pop (TV_DUMP);
2186 /* XXX clean up the whole mess to bring live info in shape again. */
2187 timevar_push (TV_GLOBAL_ALLOC);
2188 open_dump_file (DFI_greg, decl);
2190 build_insn_chain (insns);
2191 failure = reload (insns, 0);
2193 timevar_pop (TV_GLOBAL_ALLOC);
2195 if (dump_file[DFI_greg].enabled)
2197 timevar_push (TV_DUMP);
2199 dump_global_regs (rtl_dump_file);
2201 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2202 timevar_pop (TV_DUMP);
2208 reload_completed = 1;
2213 /* Run old register allocator. Return TRUE if we must exit
2214 rest_of_compilation upon return. */
2216 rest_of_handle_old_regalloc (tree decl, rtx insns)
2221 /* Allocate the reg_renumber array. */
2222 allocate_reg_info (max_regno, FALSE, TRUE);
2224 /* And the reg_equiv_memory_loc array. */
2225 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2227 allocate_initial_values (reg_equiv_memory_loc);
2229 regclass (insns, max_reg_num (), rtl_dump_file);
2230 rebuild_notes = local_alloc ();
2232 timevar_pop (TV_LOCAL_ALLOC);
2234 /* Local allocation may have turned an indirect jump into a direct
2235 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2239 timevar_push (TV_JUMP);
2241 rebuild_jump_labels (insns);
2242 purge_all_dead_edges (0);
2244 timevar_pop (TV_JUMP);
2247 if (dump_file[DFI_lreg].enabled)
2249 timevar_push (TV_DUMP);
2251 dump_flow_info (rtl_dump_file);
2252 dump_local_alloc (rtl_dump_file);
2254 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2255 timevar_pop (TV_DUMP);
2260 timevar_push (TV_GLOBAL_ALLOC);
2261 open_dump_file (DFI_greg, decl);
2263 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2264 pass fixing up any insns that are invalid. */
2267 failure = global_alloc (rtl_dump_file);
2270 build_insn_chain (insns);
2271 failure = reload (insns, 0);
2274 timevar_pop (TV_GLOBAL_ALLOC);
2276 if (dump_file[DFI_greg].enabled)
2278 timevar_push (TV_DUMP);
2280 dump_global_regs (rtl_dump_file);
2282 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2283 timevar_pop (TV_DUMP);
2289 /* Run the regrename and cprop passes. */
2291 rest_of_handle_regrename (tree decl, rtx insns)
2293 timevar_push (TV_RENAME_REGISTERS);
2294 open_dump_file (DFI_rnreg, decl);
2296 if (flag_rename_registers)
2297 regrename_optimize ();
2298 if (flag_cprop_registers)
2299 copyprop_hardreg_forward ();
2301 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2302 timevar_pop (TV_RENAME_REGISTERS);
2305 /* Reorder basic blocks. */
2307 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2310 open_dump_file (DFI_bbro, decl);
2312 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2313 splitting possibly introduced more crossjumping opportunities. */
2314 changed = cleanup_cfg (CLEANUP_EXPENSIVE
2315 | (!HAVE_conditional_execution
2316 ? CLEANUP_UPDATE_LIFE : 0));
2318 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2320 if (flag_reorder_blocks)
2321 reorder_basic_blocks ();
2322 if (flag_reorder_blocks
2323 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2324 changed |= cleanup_cfg (CLEANUP_EXPENSIVE
2325 | (!HAVE_conditional_execution
2326 ? CLEANUP_UPDATE_LIFE : 0));
2328 /* On conditional execution targets we can not update the life cheaply, so
2329 we deffer the updating to after both cleanups. This may lose some cases
2330 but should not be terribly bad. */
2331 if (changed && HAVE_conditional_execution)
2332 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2333 PROP_DEATH_NOTES | PROP_REG_INFO);
2334 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2337 #ifdef INSN_SCHEDULING
2338 /* Run instruction scheduler. */
2340 rest_of_handle_sched (tree decl, rtx insns)
2342 timevar_push (TV_SCHED);
2344 /* Print function header into sched dump now
2345 because doing the sched analysis makes some of the dump. */
2346 if (optimize > 0 && flag_schedule_insns)
2348 open_dump_file (DFI_sched, decl);
2350 /* Do control and data sched analysis,
2351 and write some of the results to dump file. */
2353 schedule_insns (rtl_dump_file);
2355 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2357 timevar_pop (TV_SCHED);
2362 /* Run second scheduling pass after reload. */
2364 rest_of_handle_sched2 (tree decl, rtx insns)
2366 timevar_push (TV_SCHED2);
2367 open_dump_file (DFI_sched2, decl);
2369 /* Do control and data sched analysis again,
2370 and write some more of the results to dump file. */
2372 split_all_insns (1);
2374 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2376 schedule_ebbs (rtl_dump_file);
2377 /* No liveness updating code yet, but it should be easy to do.
2378 reg-stack recompute the liveness when needed for now. */
2379 count_or_remove_death_notes (NULL, 1);
2380 cleanup_cfg (CLEANUP_EXPENSIVE);
2383 schedule_insns (rtl_dump_file);
2385 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2386 timevar_pop (TV_SCHED2);
2392 /* Register allocation pre-pass, to reduce number of moves necessary
2393 for two-address machines. */
2395 rest_of_handle_regmove (tree decl, rtx insns)
2397 timevar_push (TV_REGMOVE);
2398 open_dump_file (DFI_regmove, decl);
2400 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2402 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2403 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2404 timevar_pop (TV_REGMOVE);
2411 rest_of_handle_tracer (tree decl, rtx insns)
2413 open_dump_file (DFI_tracer, decl);
2415 dump_flow_info (rtl_dump_file);
2417 cleanup_cfg (CLEANUP_EXPENSIVE);
2418 reg_scan (insns, max_reg_num (), 0);
2419 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2422 /* If-conversion and CFG cleanup. */
2424 rest_of_handle_if_conversion (tree decl, rtx insns)
2426 open_dump_file (DFI_ce1, decl);
2427 if (flag_if_conversion)
2429 timevar_push (TV_IFCVT);
2431 dump_flow_info (rtl_dump_file);
2432 cleanup_cfg (CLEANUP_EXPENSIVE);
2433 reg_scan (insns, max_reg_num (), 0);
2435 timevar_pop (TV_IFCVT);
2437 timevar_push (TV_JUMP);
2438 cleanup_cfg (CLEANUP_EXPENSIVE);
2439 reg_scan (insns, max_reg_num (), 0);
2440 timevar_pop (TV_JUMP);
2441 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2444 /* Rerun if-conversion, as combine may have simplified things enough
2445 to now meet sequence length restrictions. */
2447 rest_of_handle_if_after_combine (tree decl, rtx insns)
2449 timevar_push (TV_IFCVT);
2450 open_dump_file (DFI_ce2, decl);
2456 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2457 timevar_pop (TV_IFCVT);
2461 rest_of_handle_web (tree decl, rtx insns)
2463 open_dump_file (DFI_web, decl);
2464 timevar_push (TV_WEB);
2466 delete_trivially_dead_insns (insns, max_reg_num ());
2467 cleanup_cfg (CLEANUP_EXPENSIVE);
2469 timevar_pop (TV_WEB);
2470 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2471 reg_scan (get_insns (), max_reg_num (), 0);
2474 /* Do branch profiling and static profile estimation passes. */
2476 rest_of_handle_branch_prob (tree decl, rtx insns)
2480 timevar_push (TV_BRANCH_PROB);
2481 open_dump_file (DFI_bp, decl);
2483 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2486 /* Discover and record the loop depth at the head of each basic
2487 block. The loop infrastructure does the real job for us. */
2488 flow_loops_find (&loops, LOOP_TREE);
2491 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2493 /* Estimate using heuristics if no profiling info is available. */
2494 if (flag_guess_branch_prob)
2495 estimate_probability (&loops);
2497 flow_loops_free (&loops);
2498 free_dominance_info (CDI_DOMINATORS);
2499 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2500 timevar_pop (TV_BRANCH_PROB);
2503 /* Do optimizations based on expression value profiles. */
2505 rest_of_handle_value_profile_transformations (tree decl, rtx insns)
2507 open_dump_file (DFI_vpt, decl);
2508 timevar_push (TV_VPT);
2510 if (value_profile_transformations ())
2511 cleanup_cfg (CLEANUP_EXPENSIVE);
2513 timevar_pop (TV_VPT);
2514 close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
2517 /* Do control and data flow analysis; write some of the results to the
2520 rest_of_handle_cfg (tree decl, rtx insns)
2522 open_dump_file (DFI_cfg, decl);
2524 dump_flow_info (rtl_dump_file);
2526 cleanup_cfg (CLEANUP_EXPENSIVE
2527 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2529 /* It may make more sense to mark constant functions after dead code is
2530 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2531 may insert code making function non-constant, but we still must consider
2532 it as constant, otherwise -fbranch-probabilities will not read data back.
2534 life_analysis rarely eliminates modification of external memory.
2538 /* Alias analysis depends on this information and mark_constant_function
2539 depends on alias analysis. */
2540 reg_scan (insns, max_reg_num (), 1);
2541 mark_constant_function ();
2544 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2547 /* Purge addressofs. */
2549 rest_of_handle_addressof (tree decl, rtx insns)
2551 open_dump_file (DFI_addressof, decl);
2553 purge_addressof (insns);
2554 if (optimize && purge_all_dead_edges (0))
2555 delete_unreachable_blocks ();
2556 reg_scan (insns, max_reg_num (), 1);
2558 close_dump_file (DFI_addressof, print_rtl, insns);
2561 /* We may have potential sibling or tail recursion sites. Select one
2562 (of possibly multiple) methods of performing the call. */
2564 rest_of_handle_sibling_calls (rtx insns)
2567 optimize_sibling_and_tail_recursive_calls ();
2569 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2570 free_bb_for_insn ();
2571 find_exception_handler_labels ();
2572 rebuild_jump_labels (insns);
2573 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2575 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2576 notes before simplifying cfg and we must do lowering after sibcall
2577 that unhides parts of RTL chain and cleans up the CFG.
2579 Until sibcall is replaced by tree-level optimizer, lets just
2580 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2581 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2582 if (GET_CODE (insn) == NOTE
2583 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2586 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2589 /* Perform jump bypassing and control flow optimizations. */
2591 rest_of_handle_jump_bypass (tree decl, rtx insns)
2593 timevar_push (TV_BYPASS);
2594 open_dump_file (DFI_bypass, decl);
2596 cleanup_cfg (CLEANUP_EXPENSIVE);
2597 reg_scan (insns, max_reg_num (), 1);
2599 if (bypass_jumps (rtl_dump_file))
2601 rebuild_jump_labels (insns);
2602 cleanup_cfg (CLEANUP_EXPENSIVE);
2603 delete_trivially_dead_insns (insns, max_reg_num ());
2606 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2607 timevar_pop (TV_BYPASS);
2611 #ifdef ENABLE_CHECKING
2612 verify_flow_info ();
2616 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2617 if we must exit rest_of_compilation upon return. */
2619 rest_of_handle_inlining (tree decl)
2626 /* If we are reconsidering an inline function at the end of
2627 compilation, skip the stuff for making it inline. */
2628 if (cfun->rtl_inline_init)
2630 cfun->rtl_inline_init = 1;
2632 /* If this is nested inside an inlined external function, pretend
2633 it was only declared. Since we cannot inline such functions,
2634 generating code for this one is not only not necessary but will
2635 confuse some debugging output writers. */
2636 for (parent = DECL_CONTEXT (current_function_decl);
2637 parent != NULL_TREE;
2638 parent = get_containing_scope (parent))
2639 if (TREE_CODE (parent) == FUNCTION_DECL
2640 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2642 DECL_INITIAL (decl) = 0;
2645 else if (TYPE_P (parent))
2646 /* A function in a local class should be treated normally. */
2649 /* If requested, consider whether to make this function inline. */
2650 if ((DECL_INLINE (decl) && !flag_no_inline)
2651 || flag_inline_functions)
2653 timevar_push (TV_INTEGRATION);
2654 lose = function_cannot_inline_p (decl);
2655 timevar_pop (TV_INTEGRATION);
2656 if (lose || ! optimize)
2658 if (warn_inline && lose && DECL_INLINE (decl))
2660 char *msg = concat ("%J", lose, NULL);
2661 warning (msg, decl);
2664 DECL_ABSTRACT_ORIGIN (decl) = 0;
2665 /* Don't really compile an extern inline function.
2666 If we can't make it inline, pretend
2667 it was only declared. */
2668 if (DECL_EXTERNAL (decl))
2670 DECL_INITIAL (decl) = 0;
2675 inlinable = DECL_INLINE (decl) = 1;
2678 insns = get_insns ();
2680 /* Dump the rtl code if we are dumping rtl. */
2682 if (open_dump_file (DFI_rtl, decl))
2684 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2685 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2686 close_dump_file (DFI_rtl, print_rtl, insns);
2689 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2690 sorts of eh initialization. Delay this until after the
2691 initial rtl dump so that we can see the original nesting. */
2692 convert_from_eh_region_ranges ();
2694 /* If function is inline, and we don't yet know whether to
2695 compile it by itself, defer decision till end of compilation.
2696 wrapup_global_declarations will (indirectly) call
2697 rest_of_compilation again for those functions that need to
2698 be output. Also defer those functions that we are supposed
2702 || (DECL_INLINE (decl)
2703 /* Egad. This RTL deferral test conflicts with Fortran assumptions
2704 for unreferenced symbols. See g77.f-torture/execute/980520-1.f.
2705 But removing this line from the check breaks all languages that
2706 use the call graph to output symbols. This hard-coded check is
2707 the least invasive work-around. */
2708 && (flag_inline_functions
2709 || strcmp (lang_hooks.name, "GNU F77") == 0)
2710 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2711 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2712 && ! flag_keep_inline_functions)
2713 || DECL_EXTERNAL (decl))))
2714 DECL_DEFER_OUTPUT (decl) = 1;
2716 if (DECL_INLINE (decl))
2717 /* DWARF wants separate debugging info for abstract and
2718 concrete instances of all inline functions, including those
2719 declared inline but not inlined, and those inlined even
2720 though they weren't declared inline. Conveniently, that's
2721 what DECL_INLINE means at this point. */
2722 (*debug_hooks->deferred_inline_function) (decl);
2724 if (DECL_DEFER_OUTPUT (decl))
2726 /* If -Wreturn-type, we have to do a bit of compilation. We just
2727 want to call cleanup the cfg to figure out whether or not we can
2728 fall off the end of the function; we do the minimum amount of
2729 work necessary to make that safe. */
2730 if (warn_return_type)
2732 int saved_optimize = optimize;
2735 rebuild_jump_labels (insns);
2736 find_exception_handler_labels ();
2737 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2738 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2739 optimize = saved_optimize;
2741 /* CFG is no longer maintained up-to-date. */
2742 free_bb_for_insn ();
2745 set_nothrow_function_flags ();
2746 if (current_function_nothrow)
2747 /* Now we know that this can't throw; set the flag for the benefit
2748 of other functions later in this translation unit. */
2749 TREE_NOTHROW (current_function_decl) = 1;
2751 timevar_push (TV_INTEGRATION);
2752 save_for_inline (decl);
2753 timevar_pop (TV_INTEGRATION);
2754 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2758 /* If specified extern inline but we aren't inlining it, we are
2759 done. This goes for anything that gets here with DECL_EXTERNAL
2760 set, not just things with DECL_INLINE. */
2761 return (bool) DECL_EXTERNAL (decl);
2764 /* Try to identify useless null pointer tests and delete them. */
2766 rest_of_handle_null_pointer (tree decl, rtx insns)
2768 open_dump_file (DFI_null, decl);
2770 dump_flow_info (rtl_dump_file);
2772 if (delete_null_pointer_checks (insns))
2773 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2775 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2778 /* Try combining insns through substitution. */
2780 rest_of_handle_combine (tree decl, rtx insns)
2782 int rebuild_jump_labels_after_combine = 0;
2784 timevar_push (TV_COMBINE);
2785 open_dump_file (DFI_combine, decl);
2787 rebuild_jump_labels_after_combine
2788 = combine_instructions (insns, max_reg_num ());
2790 /* Combining insns may have turned an indirect jump into a
2791 direct jump. Rebuild the JUMP_LABEL fields of jumping
2793 if (rebuild_jump_labels_after_combine)
2795 timevar_push (TV_JUMP);
2796 rebuild_jump_labels (insns);
2797 timevar_pop (TV_JUMP);
2799 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2802 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2803 timevar_pop (TV_COMBINE);
2808 /* Perform life analysis. */
2810 rest_of_handle_life (tree decl, rtx insns)
2812 open_dump_file (DFI_life, decl);
2815 #ifdef ENABLE_CHECKING
2816 verify_flow_info ();
2818 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2820 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2822 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2823 timevar_pop (TV_FLOW);
2825 if (warn_uninitialized)
2827 uninitialized_vars_warning (DECL_INITIAL (decl));
2829 setjmp_args_warning ();
2834 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2836 /* Insns were inserted, and possibly pseudos created, so
2837 things might look a bit different. */
2838 insns = get_insns ();
2839 allocate_reg_life_data ();
2840 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2841 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2847 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2852 /* Perform common subexpression elimination. Nonzero value from
2853 `cse_main' means that jumps were simplified and some code may now
2854 be unreachable, so do jump optimization again. */
2856 rest_of_handle_cse (tree decl, rtx insns)
2860 open_dump_file (DFI_cse, decl);
2862 dump_flow_info (rtl_dump_file);
2863 timevar_push (TV_CSE);
2865 reg_scan (insns, max_reg_num (), 1);
2867 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2869 rebuild_jump_labels (insns);
2870 if (purge_all_dead_edges (0))
2871 delete_unreachable_blocks ();
2873 delete_trivially_dead_insns (insns, max_reg_num ());
2875 /* If we are not running more CSE passes, then we are no longer
2876 expecting CSE to be run. But always rerun it in a cheap mode. */
2877 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2879 if (tem || optimize > 1)
2880 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2881 /* Try to identify useless null pointer tests and delete them. */
2882 if (flag_delete_null_pointer_checks)
2884 timevar_push (TV_JUMP);
2886 if (delete_null_pointer_checks (insns))
2887 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2888 timevar_pop (TV_JUMP);
2891 /* The second pass of jump optimization is likely to have
2892 removed a bunch more instructions. */
2893 renumber_insns (rtl_dump_file);
2895 timevar_pop (TV_CSE);
2896 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2899 /* Run second CSE pass after loop optimizations. */
2901 rest_of_handle_cse2 (tree decl, rtx insns)
2905 timevar_push (TV_CSE2);
2906 open_dump_file (DFI_cse2, decl);
2908 dump_flow_info (rtl_dump_file);
2909 /* CFG is no longer maintained up-to-date. */
2910 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2912 /* Run a pass to eliminate duplicated assignments to condition code
2913 registers. We have to run this after bypass_jumps, because it
2914 makes it harder for that pass to determine whether a jump can be
2916 cse_condition_code_reg ();
2918 purge_all_dead_edges (0);
2919 delete_trivially_dead_insns (insns, max_reg_num ());
2923 timevar_push (TV_JUMP);
2924 rebuild_jump_labels (insns);
2925 cleanup_cfg (CLEANUP_EXPENSIVE);
2926 timevar_pop (TV_JUMP);
2928 reg_scan (insns, max_reg_num (), 0);
2929 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2931 timevar_pop (TV_CSE2);
2934 /* Perform global cse. */
2936 rest_of_handle_gcse (tree decl, rtx insns)
2938 int save_csb, save_cfj;
2941 timevar_push (TV_GCSE);
2942 open_dump_file (DFI_gcse, decl);
2944 tem = gcse_main (insns, rtl_dump_file);
2945 rebuild_jump_labels (insns);
2946 delete_trivially_dead_insns (insns, max_reg_num ());
2948 save_csb = flag_cse_skip_blocks;
2949 save_cfj = flag_cse_follow_jumps;
2950 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2952 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2953 if (current_function_calls_constant_p)
2954 purge_builtin_constant_p ();
2956 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2958 if (flag_expensive_optimizations)
2960 timevar_push (TV_CSE);
2961 reg_scan (insns, max_reg_num (), 1);
2962 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2963 purge_all_dead_edges (0);
2964 delete_trivially_dead_insns (insns, max_reg_num ());
2965 timevar_pop (TV_CSE);
2966 cse_not_expected = !flag_rerun_cse_after_loop;
2969 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2970 things up. Then possibly re-run CSE again. */
2974 timevar_push (TV_JUMP);
2975 rebuild_jump_labels (insns);
2976 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2977 timevar_pop (TV_JUMP);
2979 if (flag_expensive_optimizations)
2981 timevar_push (TV_CSE);
2982 reg_scan (insns, max_reg_num (), 1);
2983 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2984 purge_all_dead_edges (0);
2985 delete_trivially_dead_insns (insns, max_reg_num ());
2986 timevar_pop (TV_CSE);
2990 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2991 timevar_pop (TV_GCSE);
2994 flag_cse_skip_blocks = save_csb;
2995 flag_cse_follow_jumps = save_cfj;
2996 #ifdef ENABLE_CHECKING
2997 verify_flow_info ();
3001 /* Move constant computations out of loops. */
3003 rest_of_handle_loop_optimize (tree decl, rtx insns)
3005 int do_unroll, do_prefetch;
3007 timevar_push (TV_LOOP);
3008 delete_dead_jumptables ();
3009 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3010 open_dump_file (DFI_loop, decl);
3012 /* CFG is no longer maintained up-to-date. */
3013 free_bb_for_insn ();
3015 if (flag_unroll_loops)
3016 do_unroll = LOOP_AUTO_UNROLL; /* Having two unrollers is useless. */
3018 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3019 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3021 if (flag_rerun_loop_opt)
3023 cleanup_barriers ();
3025 /* We only want to perform unrolling once. */
3026 loop_optimize (insns, rtl_dump_file, do_unroll);
3029 /* The first call to loop_optimize makes some instructions
3030 trivially dead. We delete those instructions now in the
3031 hope that doing so will make the heuristics in loop work
3032 better and possibly speed up compilation. */
3033 delete_trivially_dead_insns (insns, max_reg_num ());
3035 /* The regscan pass is currently necessary as the alias
3036 analysis code depends on this information. */
3037 reg_scan (insns, max_reg_num (), 1);
3039 cleanup_barriers ();
3040 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3042 /* Loop can create trivially dead instructions. */
3043 delete_trivially_dead_insns (insns, max_reg_num ());
3044 close_dump_file (DFI_loop, print_rtl, insns);
3045 timevar_pop (TV_LOOP);
3046 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3051 /* Perform loop optimizations. It might be better to do them a bit
3052 sooner, but we want the profile feedback to work more
3055 rest_of_handle_loop2 (tree decl, rtx insns)
3057 struct loops *loops;
3058 timevar_push (TV_LOOP);
3059 open_dump_file (DFI_loop2, decl);
3061 dump_flow_info (rtl_dump_file);
3063 loops = loop_optimizer_init (rtl_dump_file);
3067 /* The optimizations: */
3068 if (flag_unswitch_loops)
3069 unswitch_loops (loops);
3071 if (flag_peel_loops || flag_unroll_loops)
3072 unroll_and_peel_loops (loops,
3073 (flag_peel_loops ? UAP_PEEL : 0) |
3074 (flag_unroll_loops ? UAP_UNROLL : 0) |
3075 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3077 loop_optimizer_finalize (loops, rtl_dump_file);
3080 cleanup_cfg (CLEANUP_EXPENSIVE);
3081 delete_trivially_dead_insns (insns, max_reg_num ());
3082 reg_scan (insns, max_reg_num (), 0);
3084 dump_flow_info (rtl_dump_file);
3085 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3086 timevar_pop (TV_LOOP);
3090 /* This is called from finish_function (within langhooks.parse_file)
3091 after each top-level definition is parsed.
3092 It is supposed to compile that function or variable
3093 and output the assembler code for it.
3094 After we return, the tree storage is freed. */
3097 rest_of_compilation (tree decl)
3101 timevar_push (TV_REST_OF_COMPILATION);
3103 /* Register rtl specific functions for cfg. */
3104 rtl_register_cfg_hooks ();
3106 /* Now that we're out of the frontend, we shouldn't have any more
3107 CONCATs anywhere. */
3108 generating_concat_p = 0;
3110 /* When processing delayed functions, prepare_function_start() won't
3111 have been run to re-initialize it. */
3112 cse_not_expected = ! optimize;
3114 /* First, make sure that NOTE_BLOCK is set correctly for each
3115 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3116 if (!cfun->x_whole_function_mode_p)
3119 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3120 tree in sensible shape. So, we just recalculate it here. */
3121 if (cfun->x_whole_function_mode_p)
3126 if (rest_of_handle_inlining (decl))
3127 goto exit_rest_of_compilation;
3129 /* If we're emitting a nested function, make sure its parent gets
3130 emitted as well. Doing otherwise confuses debug info. */
3133 for (parent = DECL_CONTEXT (current_function_decl);
3134 parent != NULL_TREE;
3135 parent = get_containing_scope (parent))
3136 if (TREE_CODE (parent) == FUNCTION_DECL)
3137 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3140 /* We are now committed to emitting code for this function. Do any
3141 preparation, such as emitting abstract debug info for the inline
3142 before it gets mangled by optimization. */
3143 if (cgraph_function_possibly_inlined_p (decl))
3144 (*debug_hooks->outlining_inline_function) (decl);
3146 /* Remove any notes we don't need. That will make iterating
3147 over the instruction sequence faster, and allow the garbage
3148 collector to reclaim the memory used by the notes. */
3149 remove_unnecessary_notes ();
3154 /* Initialize some variables used by the optimizers. */
3155 init_function_for_compilation ();
3157 if (! DECL_DEFER_OUTPUT (decl))
3158 TREE_ASM_WRITTEN (decl) = 1;
3160 /* Now that integrate will no longer see our rtl, we need not
3161 distinguish between the return value of this function and the
3162 return value of called functions. Also, we can remove all SETs
3163 of subregs of hard registers; they are only here because of
3164 integrate. Also, we can now initialize pseudos intended to
3165 carry magic hard reg data throughout the function. */
3166 rtx_equal_function_value_matters = 0;
3167 purge_hard_subreg_sets (get_insns ());
3169 /* Early return if there were errors. We can run afoul of our
3170 consistency checks, and there's not really much point in fixing them.
3171 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3172 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3173 || errorcount || sorrycount)
3174 goto exit_rest_of_compilation;
3176 timevar_push (TV_JUMP);
3177 open_dump_file (DFI_sibling, decl);
3178 insns = get_insns ();
3179 rebuild_jump_labels (insns);
3180 find_exception_handler_labels ();
3181 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3183 delete_unreachable_blocks ();
3185 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3186 if (flag_guess_branch_prob)
3188 timevar_push (TV_BRANCH_PROB);
3189 note_prediction_to_br_prob ();
3190 timevar_pop (TV_BRANCH_PROB);
3193 if (flag_optimize_sibling_calls)
3194 rest_of_handle_sibling_calls (insns);
3196 /* We have to issue these warnings now already, because CFG cleanups
3197 further down may destroy the required information. However, this
3198 must be done after the sibcall optimization pass because the barrier
3199 emitted for noreturn calls that are candidate for the optimization
3200 is folded into the CALL_PLACEHOLDER until after this pass, so the
3201 CFG is inaccurate. */
3202 check_function_return_warnings ();
3204 timevar_pop (TV_JUMP);
3206 insn_locators_initialize ();
3207 /* Complete generation of exception handling code. */
3210 timevar_push (TV_JUMP);
3211 open_dump_file (DFI_eh, decl);
3213 finish_eh_generation ();
3215 close_dump_file (DFI_eh, print_rtl, get_insns ());
3216 timevar_pop (TV_JUMP);
3219 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3220 generation, which might create new sets. */
3221 emit_initial_value_sets ();
3224 /* If we are doing position-independent code generation, now
3225 is the time to output special prologues and epilogues.
3226 We do not want to do this earlier, because it just clutters
3227 up inline functions with meaningless insns. */
3232 insns = get_insns ();
3234 /* Copy any shared structure that should not be shared. */
3235 unshare_all_rtl (current_function_decl, insns);
3237 #ifdef SETJMP_VIA_SAVE_AREA
3238 /* This must be performed before virtual register instantiation.
3239 Please be aware the everything in the compiler that can look
3240 at the RTL up to this point must understand that REG_SAVE_AREA
3241 is just like a use of the REG contained inside. */
3242 if (current_function_calls_alloca)
3243 optimize_save_area_alloca (insns);
3246 /* Instantiate all virtual registers. */
3247 instantiate_virtual_regs (current_function_decl, insns);
3249 open_dump_file (DFI_jump, decl);
3251 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3252 are initialized and to compute whether control can drop off the end
3255 timevar_push (TV_JUMP);
3256 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3257 before jump optimization switches branch directions. */
3258 if (flag_guess_branch_prob)
3259 expected_value_to_br_prob ();
3261 reg_scan (insns, max_reg_num (), 0);
3262 rebuild_jump_labels (insns);
3263 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3264 delete_trivially_dead_insns (insns, max_reg_num ());
3266 dump_flow_info (rtl_dump_file);
3267 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3268 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3272 free_bb_for_insn ();
3273 copy_loop_headers (insns);
3274 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3276 purge_line_number_notes (insns);
3278 timevar_pop (TV_JUMP);
3279 close_dump_file (DFI_jump, print_rtl, insns);
3281 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3282 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3283 goto exit_rest_of_compilation;
3285 timevar_push (TV_JUMP);
3288 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3290 if (flag_delete_null_pointer_checks)
3291 rest_of_handle_null_pointer (decl, insns);
3293 /* Jump optimization, and the removal of NULL pointer checks, may
3294 have reduced the number of instructions substantially. CSE, and
3295 future passes, allocate arrays whose dimensions involve the
3296 maximum instruction UID, so if we can reduce the maximum UID
3297 we'll save big on memory. */
3298 renumber_insns (rtl_dump_file);
3299 timevar_pop (TV_JUMP);
3301 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3306 rest_of_handle_cse (decl, insns);
3308 rest_of_handle_addressof (decl, insns);
3315 rest_of_handle_gcse (decl, insns);
3317 if (flag_loop_optimize)
3318 rest_of_handle_loop_optimize (decl, insns);
3321 timevar_push (TV_FLOW);
3323 rest_of_handle_cfg (decl, insns);
3326 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3328 rest_of_handle_branch_prob (decl, insns);
3330 if (flag_branch_probabilities
3331 && flag_profile_values
3332 && flag_value_profile_transformations)
3333 rest_of_handle_value_profile_transformations (decl, insns);
3335 /* Remove the death notes created for vpt. */
3336 if (flag_profile_values)
3337 count_or_remove_death_notes (NULL, 1);
3341 rest_of_handle_if_conversion (decl, insns);
3344 rest_of_handle_tracer (decl, insns);
3348 if (flag_unswitch_loops
3350 || flag_unroll_loops)
3351 rest_of_handle_loop2 (decl, insns);
3354 rest_of_handle_jump_bypass (decl, insns);
3358 rest_of_handle_web (decl, insns);
3360 if (flag_rerun_cse_after_loop)
3361 rest_of_handle_cse2 (decl, insns);
3363 cse_not_expected = 1;
3365 rest_of_handle_life (decl, insns);
3368 rest_of_handle_combine (decl, insns);
3370 if (flag_if_conversion)
3371 rest_of_handle_if_after_combine (decl, insns);
3373 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3374 rest_of_handle_regmove (decl, insns);
3376 /* Do unconditional splitting before register allocation to allow machine
3377 description to add extra information not needed previously. */
3378 split_all_insns (1);
3380 #ifdef OPTIMIZE_MODE_SWITCHING
3381 timevar_push (TV_MODE_SWITCH);
3384 optimize_mode_switching (NULL);
3387 timevar_pop (TV_MODE_SWITCH);
3390 /* Any of the several passes since flow1 will have munged register
3391 lifetime data a bit. We need it to be up to date for scheduling
3392 (see handling of reg_known_equiv in init_alias_analysis). */
3393 recompute_reg_usage (insns, !optimize_size);
3395 #ifdef INSN_SCHEDULING
3396 rest_of_handle_sched (decl, insns);
3399 /* Determine if the current function is a leaf before running reload
3400 since this can impact optimizations done by the prologue and
3401 epilogue thus changing register elimination offsets. */
3402 current_function_is_leaf = leaf_function_p ();
3404 timevar_push (TV_LOCAL_ALLOC);
3405 open_dump_file (DFI_lreg, decl);
3407 if (flag_new_regalloc)
3409 if (rest_of_handle_new_regalloc (decl, insns))
3410 goto exit_rest_of_compilation;
3414 if (rest_of_handle_old_regalloc (decl, insns))
3415 goto exit_rest_of_compilation;
3420 open_dump_file (DFI_postreload, decl);
3422 /* Do a very simple CSE pass over just the hard registers. */
3425 timevar_push (TV_RELOAD_CSE_REGS);
3426 reload_cse_regs (insns);
3427 /* reload_cse_regs can eliminate potentially-trapping MEMs.
3428 Remove any EH edges associated with them. */
3429 if (flag_non_call_exceptions)
3430 purge_all_dead_edges (0);
3431 timevar_pop (TV_RELOAD_CSE_REGS);
3434 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3436 /* Re-create the death notes which were deleted during reload. */
3437 timevar_push (TV_FLOW2);
3438 open_dump_file (DFI_flow2, decl);
3440 #ifdef ENABLE_CHECKING
3441 verify_flow_info ();
3444 /* If optimizing, then go ahead and split insns now. */
3448 split_all_insns (0);
3450 if (flag_branch_target_load_optimize)
3452 open_dump_file (DFI_branch_target_load, decl);
3454 branch_target_load_optimize (insns, false);
3456 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3462 cleanup_cfg (CLEANUP_EXPENSIVE);
3464 /* On some machines, the prologue and epilogue code, or parts thereof,
3465 can be represented as RTL. Doing so lets us schedule insns between
3466 it and the rest of the code and also allows delayed branch
3467 scheduling to operate in the epilogue. */
3468 thread_prologue_and_epilogue_insns (insns);
3469 epilogue_completed = 1;
3473 life_analysis (insns, rtl_dump_file, PROP_POSTRELOAD);
3474 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3475 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3477 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3478 even for machines with possibly nonzero RETURN_POPS_ARGS
3479 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3480 push instructions will have popping returns. */
3481 #ifndef PUSH_ROUNDING
3482 if (!ACCUMULATE_OUTGOING_ARGS)
3484 combine_stack_adjustments ();
3489 flow2_completed = 1;
3491 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3492 timevar_pop (TV_FLOW2);
3494 #ifdef HAVE_peephole2
3495 if (optimize > 0 && flag_peephole2)
3497 timevar_push (TV_PEEPHOLE2);
3498 open_dump_file (DFI_peephole2, decl);
3500 peephole2_optimize (rtl_dump_file);
3502 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3503 timevar_pop (TV_PEEPHOLE2);
3507 open_dump_file (DFI_ce3, decl);
3509 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3510 splitting possibly introduced more crossjumping opportunities. */
3511 cleanup_cfg (CLEANUP_EXPENSIVE
3512 | CLEANUP_UPDATE_LIFE
3513 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3514 if (flag_if_conversion2)
3516 timevar_push (TV_IFCVT2);
3520 timevar_pop (TV_IFCVT2);
3522 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3526 if (flag_rename_registers || flag_cprop_registers)
3527 rest_of_handle_regrename (decl, insns);
3529 rest_of_handle_reorder_blocks (decl, insns);
3532 if (flag_branch_target_load_optimize2)
3534 /* Leave this a warning for now so that it is possible to experiment
3535 with running this pass twice. In 3.6, we should either make this
3536 an error, or use separate dump files. */
3537 if (flag_branch_target_load_optimize)
3538 warning ("branch target register load optimization is not intended "
3541 open_dump_file (DFI_branch_target_load, decl);
3543 branch_target_load_optimize (insns, true);
3545 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3550 #ifdef INSN_SCHEDULING
3551 if (optimize > 0 && flag_schedule_insns_after_reload)
3552 rest_of_handle_sched2 (decl, insns);
3555 #ifdef LEAF_REGISTERS
3556 current_function_uses_only_leaf_regs
3557 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3561 rest_of_handle_stack_regs (decl, insns);
3564 compute_alignments ();
3566 /* CFG is no longer maintained up-to-date. */
3567 free_bb_for_insn ();
3569 if (targetm.machine_dependent_reorg != 0)
3570 rest_of_handle_machine_reorg (decl, insns);
3572 purge_line_number_notes (insns);
3573 cleanup_barriers ();
3576 if (optimize > 0 && flag_delayed_branch)
3577 rest_of_handle_delay_slots (decl, insns);
3580 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3581 timevar_push (TV_SHORTEN_BRANCH);
3582 split_all_insns_noflow ();
3583 timevar_pop (TV_SHORTEN_BRANCH);
3586 convert_to_eh_region_ranges ();
3588 /* Shorten branches. */
3589 timevar_push (TV_SHORTEN_BRANCH);
3590 shorten_branches (get_insns ());
3591 timevar_pop (TV_SHORTEN_BRANCH);
3593 set_nothrow_function_flags ();
3594 if (current_function_nothrow)
3595 /* Now we know that this can't throw; set the flag for the benefit
3596 of other functions later in this translation unit. */
3597 TREE_NOTHROW (current_function_decl) = 1;
3599 rest_of_handle_final (decl, insns);
3601 /* Write DBX symbols if requested. */
3603 /* Note that for those inline functions where we don't initially
3604 know for certain that we will be generating an out-of-line copy,
3605 the first invocation of this routine (rest_of_compilation) will
3606 skip over this code by doing a `goto exit_rest_of_compilation;'.
3607 Later on, wrapup_global_declarations will (indirectly) call
3608 rest_of_compilation again for those inline functions that need
3609 to have out-of-line copies generated. During that call, we
3610 *will* be routed past here. */
3612 timevar_push (TV_SYMOUT);
3613 (*debug_hooks->function_decl) (decl);
3614 timevar_pop (TV_SYMOUT);
3616 exit_rest_of_compilation:
3618 coverage_end_function ();
3620 /* In case the function was not output,
3621 don't leave any temporary anonymous types
3622 queued up for sdb output. */
3623 #ifdef SDB_DEBUGGING_INFO
3624 if (write_symbols == SDB_DEBUG)
3625 sdbout_types (NULL_TREE);
3628 reload_completed = 0;
3629 epilogue_completed = 0;
3630 flow2_completed = 0;
3633 timevar_push (TV_FINAL);
3635 /* Clear out the insn_length contents now that they are no
3637 init_insn_lengths ();
3639 /* Show no temporary slots allocated. */
3642 free_basic_block_vars (0);
3643 free_bb_for_insn ();
3645 timevar_pop (TV_FINAL);
3647 if ((*targetm.binds_local_p) (current_function_decl))
3649 int pref = cfun->preferred_stack_boundary;
3650 if (cfun->recursive_call_emit
3651 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3652 pref = cfun->stack_alignment_needed;
3653 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3657 /* Make sure volatile mem refs aren't considered valid operands for
3658 arithmetic insns. We must call this here if this is a nested inline
3659 function, since the above code leaves us in the init_recog state
3660 (from final.c), and the function context push/pop code does not
3661 save/restore volatile_ok.
3663 ??? Maybe it isn't necessary for expand_start_function to call this
3664 anymore if we do it here? */
3666 init_recog_no_volatile ();
3668 /* We're done with this function. Free up memory if we can. */
3669 free_after_parsing (cfun);
3670 if (! DECL_DEFER_OUTPUT (decl))
3672 free_after_compilation (cfun);
3673 DECL_SAVED_INSNS (decl) = 0;
3679 timevar_pop (TV_REST_OF_COMPILATION);
3682 /* Display help for target options. */
3684 display_target_options (void)
3687 static bool displayed = false;
3689 /* Avoid double printing for --help --target-help. */
3695 if (ARRAY_SIZE (target_switches) > 1
3696 #ifdef TARGET_OPTIONS
3697 || ARRAY_SIZE (target_options) > 1
3705 printf (_("\nTarget specific options:\n"));
3707 for (i = ARRAY_SIZE (target_switches); i--;)
3709 const char *option = target_switches[i].name;
3710 const char *description = target_switches[i].description;
3712 if (option == NULL || *option == 0)
3714 else if (description == NULL)
3719 printf (_(" -m%-23s [undocumented]\n"), option);
3721 else if (*description != 0)
3722 doc += printf (" -m%-23s %s\n", option, _(description));
3725 #ifdef TARGET_OPTIONS
3726 for (i = ARRAY_SIZE (target_options); i--;)
3728 const char *option = target_options[i].prefix;
3729 const char *description = target_options[i].description;
3731 if (option == NULL || *option == 0)
3733 else if (description == NULL)
3738 printf (_(" -m%-23s [undocumented]\n"), option);
3740 else if (*description != 0)
3741 doc += printf (" -m%-23s %s\n", option, _(description));
3747 printf (_("\nThere are undocumented target specific options as well.\n"));
3749 printf (_(" They exist, but they are not documented.\n"));
3754 /* Parse a -d... command line switch. */
3757 decode_d_option (const char *arg)
3765 for (i = 0; i < (int) DFI_MAX; ++i)
3766 dump_file[i].enabled = 1;
3772 flag_print_asm_name = 1;
3775 flag_dump_rtl_in_asm = 1;
3776 flag_print_asm_name = 1;
3779 graph_dump_format = vcg;
3782 rtl_dump_and_exit = 1;
3787 case 'D': /* These are handled by the preprocessor. */
3791 setup_core_dumping();
3796 for (i = 0; i < (int) DFI_MAX; ++i)
3797 if (c == dump_file[i].debug_switch)
3799 dump_file[i].enabled = 1;
3804 warning ("unrecognized gcc debugging option: %c", c);
3809 /* Indexed by enum debug_info_type. */
3810 const char *const debug_type_names[] =
3812 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3815 /* Decode -m switches. */
3816 /* Decode the switch -mNAME. */
3819 set_target_switch (const char *name)
3822 int valid_target_option = 0;
3824 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3825 if (!strcmp (target_switches[j].name, name))
3827 if (target_switches[j].value < 0)
3828 target_flags &= ~-target_switches[j].value;
3830 target_flags |= target_switches[j].value;
3833 if (target_switches[j].value < 0)
3834 target_flags_explicit |= -target_switches[j].value;
3836 target_flags_explicit |= target_switches[j].value;
3838 valid_target_option = 1;
3841 #ifdef TARGET_OPTIONS
3842 if (!valid_target_option)
3843 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3845 int len = strlen (target_options[j].prefix);
3846 if (target_options[j].value)
3848 if (!strcmp (target_options[j].prefix, name))
3850 *target_options[j].variable = target_options[j].value;
3851 valid_target_option = 1;
3856 if (!strncmp (target_options[j].prefix, name, len))
3858 *target_options[j].variable = name + len;
3859 valid_target_option = 1;
3865 if (!valid_target_option)
3866 error ("invalid option `%s'", name);
3869 /* Print version information to FILE.
3870 Each line begins with INDENT (for the case where FILE is the
3871 assembler output file). */
3874 print_version (FILE *file, const char *indent)
3877 #define __VERSION__ "[?]"
3881 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3883 "%s%s%s version %s (%s) compiled by CC.\n"
3885 , indent, *indent != 0 ? " " : "",
3886 lang_hooks.name, version_string, TARGET_NAME,
3887 indent, __VERSION__);
3888 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3889 indent, *indent != 0 ? " " : "",
3890 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3893 /* Print an option value and return the adjusted position in the line.
3894 ??? We don't handle error returns from fprintf (disk full); presumably
3895 other code will catch a disk full though. */
3898 print_single_switch (FILE *file, int pos, int max,
3899 const char *indent, const char *sep, const char *term,
3900 const char *type, const char *name)
3902 /* The ultrix fprintf returns 0 on success, so compute the result we want
3903 here since we need it for the following test. */
3904 int len = strlen (sep) + strlen (type) + strlen (name);
3909 fprintf (file, "%s", term);
3914 fprintf (file, "%s", indent);
3915 pos = strlen (indent);
3917 fprintf (file, "%s%s%s", sep, type, name);
3922 /* Print active target switches to FILE.
3923 POS is the current cursor position and MAX is the size of a "line".
3924 Each line begins with INDENT and ends with TERM.
3925 Each switch is separated from the next by SEP. */
3928 print_switch_values (FILE *file, int pos, int max,
3929 const char *indent, const char *sep, const char *term)
3934 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3935 that it can be printed below. This helps reproducibility. */
3938 /* Print the options as passed. */
3939 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3940 _("options passed: "), "");
3942 for (p = &save_argv[1]; *p != NULL; p++)
3946 if (strcmp (*p, "-o") == 0)
3952 if (strcmp (*p, "-quiet") == 0)
3954 if (strcmp (*p, "-version") == 0)
3959 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3962 fprintf (file, "%s", term);
3964 /* Print the -f and -m options that have been enabled.
3965 We don't handle language specific options but printing argv
3968 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3969 _("options enabled: "), "");
3971 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3972 if (*f_options[j].variable == f_options[j].on_value)
3973 pos = print_single_switch (file, pos, max, indent, sep, term,
3974 "-f", f_options[j].string);
3976 /* Print target specific options. */
3978 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3979 if (target_switches[j].name[0] != '\0'
3980 && target_switches[j].value > 0
3981 && ((target_switches[j].value & target_flags)
3982 == target_switches[j].value))
3984 pos = print_single_switch (file, pos, max, indent, sep, term,
3985 "-m", target_switches[j].name);
3988 #ifdef TARGET_OPTIONS
3989 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3990 if (*target_options[j].variable != NULL)
3993 sprintf (prefix, "-m%s", target_options[j].prefix);
3994 pos = print_single_switch (file, pos, max, indent, sep, term,
3995 prefix, *target_options[j].variable);
3999 fprintf (file, "%s", term);
4002 /* Open assembly code output file. Do this even if -fsyntax-only is
4003 on, because then the driver will have provided the name of a
4004 temporary file or bit bucket for us. NAME is the file specified on
4005 the command line, possibly NULL. */
4007 init_asm_output (const char *name)
4009 if (name == NULL && asm_file_name == 0)
4010 asm_out_file = stdout;
4013 if (asm_file_name == 0)
4015 int len = strlen (dump_base_name);
4016 char *dumpname = xmalloc (len + 6);
4017 memcpy (dumpname, dump_base_name, len + 1);
4018 strip_off_ending (dumpname, len);
4019 strcat (dumpname, ".s");
4020 asm_file_name = dumpname;
4022 if (!strcmp (asm_file_name, "-"))
4023 asm_out_file = stdout;
4025 asm_out_file = fopen (asm_file_name, "w+");
4026 if (asm_out_file == 0)
4027 fatal_error ("can't open %s for writing: %m", asm_file_name);
4030 #ifdef IO_BUFFER_SIZE
4031 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
4032 _IOFBF, IO_BUFFER_SIZE);
4035 if (!flag_syntax_only)
4037 targetm.asm_out.file_start ();
4039 #ifdef ASM_COMMENT_START
4040 if (flag_verbose_asm)
4042 /* Print the list of options in effect. */
4043 print_version (asm_out_file, ASM_COMMENT_START);
4044 print_switch_values (asm_out_file, 0, MAX_LINE,
4045 ASM_COMMENT_START, " ", "\n");
4046 /* Add a blank line here so it appears in assembler output but not
4048 fprintf (asm_out_file, "\n");
4054 /* Default version of get_pch_validity.
4055 By default, every flag difference is fatal; that will be mostly right for
4056 most targets, but completely right for very few. */
4059 default_get_pch_validity (size_t *len)
4061 #ifdef TARGET_OPTIONS
4066 *len = sizeof (target_flags) + 2;
4067 #ifdef TARGET_OPTIONS
4068 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4071 if (*target_options[i].variable)
4072 *len += strlen (*target_options[i].variable);
4076 result = r = xmalloc (*len);
4080 memcpy (r, &target_flags, sizeof (target_flags));
4081 r += sizeof (target_flags);
4083 #ifdef TARGET_OPTIONS
4084 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4086 const char *str = *target_options[i].variable;
4090 l = strlen (str) + 1;
4099 /* Default version of pch_valid_p. */
4102 default_pch_valid_p (const void *data_p, size_t len)
4104 const char *data = (const char *)data_p;
4105 const char *flag_that_differs = NULL;
4108 /* -fpic and -fpie also usually make a PCH invalid. */
4109 if (data[0] != flag_pic)
4110 return _("created and used with different settings of -fpic");
4111 if (data[1] != flag_pie)
4112 return _("created and used with different settings of -fpie");
4115 /* Check target_flags. */
4116 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
4118 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
4123 memcpy (&tf, data, sizeof (target_flags));
4125 bits = target_switches[i].value;
4128 if ((target_flags & bits) != (tf & bits))
4130 flag_that_differs = target_switches[i].name;
4136 data += sizeof (target_flags);
4137 len -= sizeof (target_flags);
4139 /* Check string options. */
4140 #ifdef TARGET_OPTIONS
4141 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4143 const char *str = *target_options[i].variable;
4147 l = strlen (str) + 1;
4148 if (len < l || memcmp (data, str, l) != 0)
4150 flag_that_differs = target_options[i].prefix;
4163 asprintf (&r, _("created and used with differing settings of `-m%s'"),
4166 return _("out of memory");
4171 /* Default tree printer. Handles declarations only. */
4173 default_tree_printer (pretty_printer * pp, text_info *text)
4175 switch (*text->format_spec)
4181 tree t = va_arg (*text->args_ptr, tree);
4182 const char *n = DECL_NAME (t)
4183 ? (*lang_hooks.decl_printable_name) (t, 2)
4194 /* Initialization of the front end environment, before command line
4195 options are parsed. Signal handlers, internationalization etc.
4196 ARGV0 is main's argv[0]. */
4198 general_init (const char *argv0)
4202 p = argv0 + strlen (argv0);
4203 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4207 xmalloc_set_program_name (progname);
4211 gcc_init_libintl ();
4213 /* Initialize the diagnostics reporting machinery, so option parsing
4214 can give warnings and errors. */
4215 diagnostic_initialize (global_dc);
4216 /* Set a default printer. Language specific initializations will
4217 override it later. */
4218 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4220 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4222 signal (SIGSEGV, crash_signal);
4225 signal (SIGILL, crash_signal);
4228 signal (SIGBUS, crash_signal);
4231 signal (SIGABRT, crash_signal);
4233 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4234 signal (SIGIOT, crash_signal);
4237 signal (SIGFPE, crash_signal);
4240 /* Other host-specific signal setup. */
4241 (*host_hooks.extra_signals)();
4243 /* Initialize the garbage-collector, string pools and tree type hash
4247 linemap_init (&line_table);
4250 /* Initialize register usage now so switches may override. */
4253 /* Register the language-independent parameters. */
4254 add_params (lang_independent_params, LAST_PARAM);
4256 /* This must be done after add_params but before argument processing. */
4257 init_ggc_heuristics();
4260 /* Process the options that have been parsed. */
4262 process_options (void)
4264 /* Allow the front end to perform consistency checks and do further
4265 initialization based on the command line options. This hook also
4266 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4267 so we can correctly initialize debug output. */
4268 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4269 input_filename = main_input_filename;
4271 #ifdef OVERRIDE_OPTIONS
4272 /* Some machines may reject certain combinations of options. */
4276 /* Set aux_base_name if not already set. */
4279 else if (main_input_filename)
4281 char *name = xstrdup (lbasename (main_input_filename));
4283 strip_off_ending (name, strlen (name));
4284 aux_base_name = name;
4287 aux_base_name = "gccaux";
4289 /* Set up the align_*_log variables, defaulting them to 1 if they
4290 were still unset. */
4291 if (align_loops <= 0) align_loops = 1;
4292 if (align_loops_max_skip > align_loops || !align_loops)
4293 align_loops_max_skip = align_loops - 1;
4294 align_loops_log = floor_log2 (align_loops * 2 - 1);
4295 if (align_jumps <= 0) align_jumps = 1;
4296 if (align_jumps_max_skip > align_jumps || !align_jumps)
4297 align_jumps_max_skip = align_jumps - 1;
4298 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4299 if (align_labels <= 0) align_labels = 1;
4300 align_labels_log = floor_log2 (align_labels * 2 - 1);
4301 if (align_labels_max_skip > align_labels || !align_labels)
4302 align_labels_max_skip = align_labels - 1;
4303 if (align_functions <= 0) align_functions = 1;
4304 align_functions_log = floor_log2 (align_functions * 2 - 1);
4306 /* Unrolling all loops implies that standard loop unrolling must also
4308 if (flag_unroll_all_loops)
4309 flag_unroll_loops = 1;
4311 if (flag_unroll_loops)
4313 flag_old_unroll_loops = 0;
4314 flag_old_unroll_all_loops = 0;
4317 if (flag_old_unroll_all_loops)
4318 flag_old_unroll_loops = 1;
4320 /* Old loop unrolling requires that strength_reduction be on also. Silently
4321 turn on strength reduction here if it isn't already on. Also, the loop
4322 unrolling code assumes that cse will be run after loop, so that must
4323 be turned on also. */
4324 if (flag_old_unroll_loops)
4326 flag_strength_reduce = 1;
4327 flag_rerun_cse_after_loop = 1;
4329 if (flag_unroll_loops || flag_peel_loops)
4330 flag_rerun_cse_after_loop = 1;
4332 if (flag_non_call_exceptions)
4333 flag_asynchronous_unwind_tables = 1;
4334 if (flag_asynchronous_unwind_tables)
4335 flag_unwind_tables = 1;
4337 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4339 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4340 flag_unit_at_a_time = 0;
4342 if (flag_value_profile_transformations)
4343 flag_profile_values = 1;
4345 /* Warn about options that are not supported on this machine. */
4346 #ifndef INSN_SCHEDULING
4347 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4348 warning ("instruction scheduling not supported on this target machine");
4351 if (flag_delayed_branch)
4352 warning ("this target machine does not have delayed branches");
4355 user_label_prefix = USER_LABEL_PREFIX;
4356 if (flag_leading_underscore != -1)
4358 /* If the default prefix is more complicated than "" or "_",
4359 issue a warning and ignore this option. */
4360 if (user_label_prefix[0] == 0 ||
4361 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4363 user_label_prefix = flag_leading_underscore ? "_" : "";
4366 warning ("-f%sleading-underscore not supported on this target machine",
4367 flag_leading_underscore ? "" : "no-");
4370 /* If we are in verbose mode, write out the version and maybe all the
4371 option flags in use. */
4374 print_version (stderr, "");
4376 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4379 if (flag_syntax_only)
4381 write_symbols = NO_DEBUG;
4385 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4387 if (debug_info_level == DINFO_LEVEL_NONE)
4388 write_symbols = NO_DEBUG;
4390 /* Now we know write_symbols, set up the debug hooks based on it.
4391 By default we do nothing for debug output. */
4392 if (write_symbols == NO_DEBUG)
4393 debug_hooks = &do_nothing_debug_hooks;
4394 #if defined(DBX_DEBUGGING_INFO)
4395 else if (write_symbols == DBX_DEBUG)
4396 debug_hooks = &dbx_debug_hooks;
4398 #if defined(XCOFF_DEBUGGING_INFO)
4399 else if (write_symbols == XCOFF_DEBUG)
4400 debug_hooks = &xcoff_debug_hooks;
4402 #ifdef SDB_DEBUGGING_INFO
4403 else if (write_symbols == SDB_DEBUG)
4404 debug_hooks = &sdb_debug_hooks;
4406 #ifdef DWARF2_DEBUGGING_INFO
4407 else if (write_symbols == DWARF2_DEBUG)
4408 debug_hooks = &dwarf2_debug_hooks;
4410 #ifdef VMS_DEBUGGING_INFO
4411 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4412 debug_hooks = &vmsdbg_debug_hooks;
4415 error ("target system does not support the \"%s\" debug format",
4416 debug_type_names[write_symbols]);
4418 /* If auxiliary info generation is desired, open the output file.
4419 This goes in the same directory as the source file--unlike
4420 all the other output files. */
4421 if (flag_gen_aux_info)
4423 aux_info_file = fopen (aux_info_file_name, "w");
4424 if (aux_info_file == 0)
4425 fatal_error ("can't open %s: %m", aux_info_file_name);
4428 if (! targetm.have_named_sections)
4430 if (flag_function_sections)
4432 warning ("-ffunction-sections not supported for this target");
4433 flag_function_sections = 0;
4435 if (flag_data_sections)
4437 warning ("-fdata-sections not supported for this target");
4438 flag_data_sections = 0;
4442 if (flag_function_sections && profile_flag)
4444 warning ("-ffunction-sections disabled; it makes profiling impossible");
4445 flag_function_sections = 0;
4448 #ifndef HAVE_prefetch
4449 if (flag_prefetch_loop_arrays)
4451 warning ("-fprefetch-loop-arrays not supported for this target");
4452 flag_prefetch_loop_arrays = 0;
4455 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4457 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4458 flag_prefetch_loop_arrays = 0;
4462 /* This combination of options isn't handled for i386 targets and doesn't
4463 make much sense anyway, so don't allow it. */
4464 if (flag_prefetch_loop_arrays && optimize_size)
4466 warning ("-fprefetch-loop-arrays is not supported with -Os");
4467 flag_prefetch_loop_arrays = 0;
4470 #ifndef OBJECT_FORMAT_ELF
4471 if (flag_function_sections && write_symbols != NO_DEBUG)
4472 warning ("-ffunction-sections may affect debugging on some targets");
4475 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4476 if (flag_signaling_nans)
4477 flag_trapping_math = 1;
4480 /* Initialize the compiler back end. */
4484 init_adjust_machine_modes ();
4486 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4487 || debug_info_level == DINFO_LEVEL_VERBOSE
4488 #ifdef VMS_DEBUGGING_INFO
4489 /* Enable line number info for traceback. */
4490 || debug_info_level > DINFO_LEVEL_NONE
4492 || flag_test_coverage
4493 || warn_notreached);
4496 init_fake_stack_mems ();
4500 init_function_once ();
4501 init_varasm_once ();
4503 /* The following initialization functions need to generate rtl, so
4504 provide a dummy function context for them. */
4505 init_dummy_function_start ();
4507 if (flag_caller_saves)
4508 init_caller_save ();
4509 expand_dummy_function_end ();
4512 /* Language-dependent initialization. Returns nonzero on success. */
4514 lang_dependent_init (const char *name)
4516 if (dump_base_name == 0)
4517 dump_base_name = name ? name : "gccdump";
4519 /* Other front-end initialization. */
4520 if ((*lang_hooks.init) () == 0)
4523 init_asm_output (name);
4525 /* These create various _DECL nodes, so need to be called after the
4526 front end is initialized. */
4530 /* The following initialization functions need to generate rtl, so
4531 provide a dummy function context for them. */
4532 init_dummy_function_start ();
4534 expand_dummy_function_end ();
4536 /* If dbx symbol table desired, initialize writing it and output the
4537 predefined types. */
4538 timevar_push (TV_SYMOUT);
4540 #ifdef DWARF2_UNWIND_INFO
4541 if (dwarf2out_do_frame ())
4542 dwarf2out_frame_init ();
4545 /* Now we have the correct original filename, we can initialize
4547 (*debug_hooks->init) (name);
4549 timevar_pop (TV_SYMOUT);
4554 /* Clean up: close opened files, etc. */
4559 /* Close the dump files. */
4560 if (flag_gen_aux_info)
4562 fclose (aux_info_file);
4564 unlink (aux_info_file_name);
4567 /* Close non-debugging input and output files. Take special care to note
4568 whether fclose returns an error, since the pages might still be on the
4569 buffer chain while the file is open. */
4573 if (ferror (asm_out_file) != 0)
4574 fatal_error ("error writing to %s: %m", asm_file_name);
4575 if (fclose (asm_out_file) != 0)
4576 fatal_error ("error closing %s: %m", asm_file_name);
4579 /* Do whatever is necessary to finish printing the graphs. */
4580 if (graph_dump_format != no_graph)
4584 for (i = 0; i < (int) DFI_MAX; ++i)
4585 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4590 sprintf (seq, DUMPFILE_FORMAT, i);
4591 suffix = concat (seq, dump_file[i].extension, NULL);
4592 finish_graph_dump_file (dump_base_name, suffix);
4599 ggc_print_statistics ();
4600 stringpool_statistics ();
4601 dump_tree_statistics ();
4602 dump_rtx_statistics ();
4603 dump_varray_statistics ();
4606 /* Free up memory for the benefit of leak detectors. */
4609 /* Language-specific end of compilation actions. */
4610 (*lang_hooks.finish) ();
4613 /* Initialize the compiler, and compile the input file. */
4617 /* Initialize timing first. The C front ends read the main file in
4618 the post_options hook, and C++ does file timings. */
4619 if (time_report || !quiet_flag || flag_detailed_statistics)
4621 timevar_start (TV_TOTAL);
4625 /* Don't do any more if an error has already occurred. */
4628 /* Set up the back-end if requested. */
4632 /* Language-dependent initialization. Returns true on success. */
4633 if (lang_dependent_init (main_input_filename))
4635 if (flag_unit_at_a_time)
4637 open_dump_file (DFI_cgraph, NULL);
4638 cgraph_dump_file = rtl_dump_file;
4639 rtl_dump_file = NULL;
4644 if (flag_unit_at_a_time)
4646 rtl_dump_file = cgraph_dump_file;
4647 cgraph_dump_file = NULL;
4648 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4655 /* Stop timing and print the times. */
4656 timevar_stop (TV_TOTAL);
4657 timevar_print (stderr);
4660 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4661 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4662 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4664 It is not safe to call this function more than once. */
4667 toplev_main (unsigned int argc, const char **argv)
4671 /* Initialization of GCC's environment, and diagnostics. */
4672 general_init (argv[0]);
4674 /* Parse the options and do minimal processing; basically just
4675 enough to default flags appropriately. */
4676 decode_options (argc, argv);
4680 /* Exit early if we can (e.g. -help). */
4681 if (!exit_after_options)
4684 if (errorcount || sorrycount)
4685 return (FATAL_EXIT_CODE);
4687 return (SUCCESS_EXIT_CODE);