1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addresof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
284 DFI_branch_target_load,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file[DFI_MAX] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index, tree);
345 static void close_dump_file (enum dump_file_index,
346 void (*) (FILE *, rtx), rtx);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit;
351 int flag_print_asm_name;
352 enum graph_dump_types graph_dump_format;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name;
358 /* Type(s) of debugging information we are producing (if any).
359 See flags.h for the definitions of the different possible
360 types of debugging information. */
361 enum debug_info_type write_symbols = NO_DEBUG;
363 /* Level of debugging information we are producing. See flags.h
364 for the definitions of the different possible levels. */
365 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
367 /* Nonzero means use GNU-only extensions in the generated symbolic
368 debugging information. */
369 /* Currently, this only has an effect when write_symbols is set to
370 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
371 int use_gnu_debug_info_extensions = 0;
373 /* Nonzero means do optimizations. -O.
374 Particular numeric values stand for particular amounts of optimization;
375 thus, -O2 stores 2 here. However, the optimizations beyond the basic
376 ones are not controlled directly by this variable. Instead, they are
377 controlled by individual `flag_...' variables that are defaulted
378 based on this variable. */
382 /* Nonzero means optimize for size. -Os.
383 The only valid values are zero and nonzero. When optimize_size is
384 nonzero, optimize defaults to 2, but certain individual code
385 bloating optimizations are disabled. */
387 int optimize_size = 0;
389 /* The FUNCTION_DECL for the function currently being compiled,
390 or 0 if between functions. */
391 tree current_function_decl;
393 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
395 tree current_function_func_begin_label;
397 /* Nonzero if doing dwarf2 duplicate elimination. */
399 int flag_eliminate_dwarf2_dups = 0;
401 /* Nonzero if doing unused type elimination. */
403 int flag_eliminate_unused_debug_types = 1;
405 /* Nonzero means emit debugging information only for symbols which are used. */
406 int flag_debug_only_used_symbols = 0;
408 /* Nonzero if generating code to do profiling. */
410 int profile_flag = 0;
412 /* Nonzero if generating code to profile program flow graph arcs. */
414 int profile_arc_flag = 0;
416 /* Nonzero if value histograms should be measured. */
418 int flag_profile_values = 0;
420 /* Nonzero if generating info for gcov to calculate line test coverage. */
422 int flag_test_coverage = 0;
424 /* Nonzero indicates that branch taken probabilities should be calculated. */
426 int flag_branch_probabilities = 0;
428 /* Nonzero if basic blocks should be reordered. */
430 int flag_reorder_blocks = 0;
432 /* Nonzero if functions should be reordered. */
434 int flag_reorder_functions = 0;
436 /* Nonzero if registers should be renamed. */
438 int flag_rename_registers = 0;
439 int flag_cprop_registers = 0;
441 /* Nonzero for -pedantic switch: warn about anything
442 that standard spec forbids. */
446 /* Temporarily suppress certain warnings.
447 This is set while reading code from a system header file. */
449 int in_system_header = 0;
451 /* Don't print functions as they are compiled. -quiet. */
455 /* Print times taken by the various passes. -ftime-report. */
459 /* Print memory still in use at end of compilation (which may have little
460 to do with peak memory consumption). -fmem-report. */
464 /* Nonzero means to collect statistics which might be expensive
465 and to print them when we are done. */
466 int flag_detailed_statistics = 0;
468 /* A random sequence of characters, unless overridden by user. */
469 const char *flag_random_seed;
471 /* A local time stamp derived from the time of compilation. It will be
472 zero if the system cannot provide a time. It will be -1u, if the
473 user has specified a particular random seed. */
478 /* Nonzero means `char' should be signed. */
480 int flag_signed_char;
482 /* Nonzero means give an enum type only as many bytes as it needs. */
484 int flag_short_enums;
486 /* Nonzero for -fcaller-saves: allocate values in regs that need to
487 be saved across function calls, if that produces overall better code.
488 Optional now, so people can test it. */
490 #ifdef DEFAULT_CALLER_SAVES
491 int flag_caller_saves = 1;
493 int flag_caller_saves = 0;
496 /* Nonzero if structures and unions should be returned in memory.
498 This should only be defined if compatibility with another compiler or
499 with an ABI is needed, because it results in slower code. */
501 #ifndef DEFAULT_PCC_STRUCT_RETURN
502 #define DEFAULT_PCC_STRUCT_RETURN 1
505 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
507 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
509 /* Nonzero for -fforce-mem: load memory value into a register
510 before arithmetic on it. This makes better cse but slower compilation. */
512 int flag_force_mem = 0;
514 /* Nonzero for -fforce-addr: load memory address into a register before
515 reference to memory. This makes better cse but slower compilation. */
517 int flag_force_addr = 0;
519 /* Nonzero for -fdefer-pop: don't pop args after each function call;
520 instead save them up to pop many calls' args with one insns. */
522 int flag_defer_pop = 0;
524 /* Nonzero for -ffloat-store: don't allocate floats and doubles
525 in extended-precision registers. */
527 int flag_float_store = 0;
529 /* Nonzero for -fcse-follow-jumps:
530 have cse follow jumps to do a more extensive job. */
532 int flag_cse_follow_jumps;
534 /* Nonzero for -fcse-skip-blocks:
535 have cse follow a branch around a block. */
536 int flag_cse_skip_blocks;
538 /* Nonzero for -fexpensive-optimizations:
539 perform miscellaneous relatively-expensive optimizations. */
540 int flag_expensive_optimizations;
542 /* Nonzero for -fthread-jumps:
543 have jump optimize output of loop. */
545 int flag_thread_jumps;
547 /* Nonzero enables strength-reduction in loop.c. */
549 int flag_strength_reduce = 0;
551 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
552 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
553 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
556 int flag_old_unroll_loops;
558 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
559 This is generally not a win. */
561 int flag_old_unroll_all_loops;
563 /* Enables unrolling of simple loops in loop-unroll.c. */
564 int flag_unroll_loops;
566 /* Enables unrolling of all loops in loop-unroll.c. */
567 int flag_unroll_all_loops;
569 /* Nonzero enables loop peeling. */
572 /* Nonzero enables loop unswitching. */
573 int flag_unswitch_loops;
575 /* Nonzero enables prefetch optimizations for arrays in loops. */
577 int flag_prefetch_loop_arrays;
579 /* Nonzero forces all invariant computations in loops to be moved
582 int flag_move_all_movables = 0;
584 /* Nonzero forces all general induction variables in loops to be
587 int flag_reduce_all_givs = 0;
589 /* Nonzero to perform full register move optimization passes. This is the
592 int flag_regmove = 0;
594 /* Nonzero for -fwritable-strings:
595 store string constants in data segment and don't uniquize them. */
597 int flag_writable_strings = 0;
599 /* Nonzero means don't put addresses of constant functions in registers.
600 Used for compiling the Unix kernel, where strange substitutions are
601 done on the assembly output. */
603 int flag_no_function_cse = 0;
605 /* Nonzero for -fomit-frame-pointer:
606 don't make a frame pointer in simple functions that don't require one. */
608 int flag_omit_frame_pointer = 0;
610 /* Nonzero means place each function into its own section on those platforms
611 which support arbitrary section names and unlimited numbers of sections. */
613 int flag_function_sections = 0;
615 /* ... and similar for data. */
617 int flag_data_sections = 0;
619 /* Nonzero to inhibit use of define_optimization peephole opts. */
621 int flag_no_peephole = 0;
623 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
625 int flag_optimize_sibling_calls = 0;
627 /* Nonzero means the front end generally wants `errno' maintained by math
628 operations, like built-in SQRT. */
630 int flag_errno_math = 1;
632 /* Nonzero means that unsafe floating-point math optimizations are allowed
633 for the sake of speed. IEEE compliance is not guaranteed, and operations
634 are allowed to assume that their arguments and results are "normal"
635 (e.g., nonnegative for SQRT). */
637 int flag_unsafe_math_optimizations = 0;
639 /* Nonzero means that no NaNs or +-Infs are expected. */
641 int flag_finite_math_only = 0;
643 /* Zero means that floating-point math operations cannot generate a
644 (user-visible) trap. This is the case, for example, in nonstop
645 IEEE 754 arithmetic. Trapping conditions include division by zero,
646 overflow, underflow, invalid and inexact, but does not include
647 operations on signaling NaNs (see below). */
649 int flag_trapping_math = 1;
651 /* Nonzero means disable transformations observable by signaling NaNs.
652 This option implies that any operation on an IEEE signaling NaN can
653 generate a (user-visible) trap. */
655 int flag_signaling_nans = 0;
657 /* 0 means straightforward implementation of complex divide acceptable.
658 1 means wide ranges of inputs must work for complex divide.
659 2 means C99-like requirements for complex divide (not yet implemented). */
661 int flag_complex_divide_method = 0;
663 /* Nonzero means just do syntax checking; don't output anything. */
665 int flag_syntax_only = 0;
667 /* Nonzero means perform loop optimizer. */
669 int flag_loop_optimize;
671 /* Nonzero means perform crossjumping. */
673 int flag_crossjumping;
675 /* Nonzero means perform if conversion. */
677 int flag_if_conversion;
679 /* Nonzero means perform if conversion after reload. */
681 int flag_if_conversion2;
683 /* Nonzero means to use global dataflow analysis to eliminate
684 useless null pointer tests. */
686 int flag_delete_null_pointer_checks;
688 /* Nonzero means perform global CSE. */
692 /* Nonzero means to do the enhanced load motion during gcse, which trys
693 to hoist loads by not killing them when a store to the same location
696 int flag_gcse_lm = 1;
698 /* Nonzero means to perform store motion after gcse, which will try to
699 move stores closer to the exit block. Its not very effective without
702 int flag_gcse_sm = 1;
704 /* Perform target register optimization before prologue / epilogue
707 int flag_branch_target_load_optimize = 0;
709 /* Perform target register optimization after prologue / epilogue
710 threading and jump2. */
712 int flag_branch_target_load_optimize2 = 0;
714 /* Nonzero means to rerun cse after loop optimization. This increases
715 compilation time about 20% and picks up a few more common expressions. */
717 int flag_rerun_cse_after_loop;
719 /* Nonzero means to run loop optimizations twice. */
721 int flag_rerun_loop_opt;
723 /* Nonzero for -finline-functions: ok to inline functions that look like
724 good inline candidates. */
726 int flag_inline_functions;
728 /* Nonzero for -fkeep-inline-functions: even if we make a function
729 go inline everywhere, keep its definition around for debugging
732 int flag_keep_inline_functions;
734 /* Nonzero means that functions will not be inlined. */
736 int flag_no_inline = 2;
738 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
739 not just because the tree inliner turned us off. */
741 int flag_really_no_inline = 2;
743 /* Nonzero means that we should emit static const variables
744 regardless of whether or not optimization is turned on. */
746 int flag_keep_static_consts = 1;
748 /* Nonzero means we should be saving declaration info into a .X file. */
750 int flag_gen_aux_info = 0;
752 /* Specified name of aux-info file. */
754 const char *aux_info_file_name;
756 /* Nonzero means make the text shared if supported. */
758 int flag_shared_data;
760 /* Nonzero means schedule into delayed branch slots if supported. */
762 int flag_delayed_branch;
764 /* Nonzero if we are compiling pure (sharable) code.
765 Value is 1 if we are doing "small" pic; value is 2 if we're doing
770 /* Nonzero if we are compiling position independent code for executable.
771 The value is 1 if we are doing "small" pic; value is 2 if we're doing
776 /* Nonzero if we are compiling code for a shared library, zero for
781 /* Set to the default thread-local storage (tls) model to use. */
783 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
785 /* Nonzero means generate extra code for exception handling and enable
786 exception handling. */
790 /* Nonzero means generate frame unwind info table when supported. */
792 int flag_unwind_tables = 0;
794 /* Nonzero means generate frame unwind info table exact at each insn
797 int flag_asynchronous_unwind_tables = 0;
799 /* Nonzero means don't place uninitialized global data in common storage
804 /* Nonzero means change certain warnings into errors.
805 Usually these are warnings about failure to conform to some standard. */
807 int flag_pedantic_errors = 0;
809 /* flag_schedule_insns means schedule insns within basic blocks (before
811 flag_schedule_insns_after_reload means schedule insns after
814 int flag_schedule_insns = 0;
815 int flag_schedule_insns_after_reload = 0;
817 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
818 int flag_sched2_use_superblocks = 0;
820 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
822 int flag_sched2_use_traces = 0;
824 /* The following flags have effect only for scheduling before register
827 flag_schedule_interblock means schedule insns across basic blocks.
828 flag_schedule_speculative means allow speculative motion of non-load insns.
829 flag_schedule_speculative_load means allow speculative motion of some
831 flag_schedule_speculative_load_dangerous allows speculative motion of more
834 int flag_schedule_interblock = 1;
835 int flag_schedule_speculative = 1;
836 int flag_schedule_speculative_load = 0;
837 int flag_schedule_speculative_load_dangerous = 0;
839 int flag_single_precision_constant;
841 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
842 by a cheaper branch on a count register. */
843 int flag_branch_on_count_reg = 1;
845 /* -finhibit-size-directive inhibits output of .size for ELF.
846 This is used only for compiling crtstuff.c,
847 and it may be extended to other effects
848 needed for crtstuff.c on other systems. */
849 int flag_inhibit_size_directive = 0;
851 /* -fverbose-asm causes extra commentary information to be produced in
852 the generated assembly code (to make it more readable). This option
853 is generally only of use to those who actually need to read the
854 generated assembly code (perhaps while debugging the compiler itself).
855 -fno-verbose-asm, the default, causes the extra information
856 to be omitted and is useful when comparing two assembler files. */
858 int flag_verbose_asm = 0;
860 /* -dA causes debug commentary information to be produced in
861 the generated assembly code (to make it more readable). This option
862 is generally only of use to those who actually need to read the
863 generated assembly code (perhaps while debugging the compiler itself).
864 Currently, this switch is only used by dwarfout.c; however, it is intended
865 to be a catchall for printing debug information in the assembler file. */
867 int flag_debug_asm = 0;
869 /* -dP causes the rtl to be emitted as a comment in assembly. */
871 int flag_dump_rtl_in_asm = 0;
873 /* -fgnu-linker specifies use of the GNU linker for initializations.
874 (Or, more generally, a linker that handles initializations.)
875 -fno-gnu-linker says that collect2 will be used. */
877 int flag_gnu_linker = 0;
879 int flag_gnu_linker = 1;
882 /* Nonzero means put zero initialized data in the bss section. */
883 int flag_zero_initialized_in_bss = 1;
888 /* Enable ssa conditional constant propagation. */
889 int flag_ssa_ccp = 0;
891 /* Enable ssa aggressive dead code elimination. */
892 int flag_ssa_dce = 0;
894 /* Tag all structures with __attribute__(packed). */
895 int flag_pack_struct = 0;
897 /* Emit code to check for stack overflow; also may cause large objects
898 to be allocated dynamically. */
899 int flag_stack_check;
901 /* When non-NULL, indicates that whenever space is allocated on the
902 stack, the resulting stack pointer must not pass this
903 address---that is, for stacks that grow downward, the stack pointer
904 must always be greater than or equal to this address; for stacks
905 that grow upward, the stack pointer must be less than this address.
906 At present, the rtx may be either a REG or a SYMBOL_REF, although
907 the support provided depends on the backend. */
910 /* 0 if pointer arguments may alias each other. True in C.
911 1 if pointer arguments may not alias each other but may alias
913 2 if pointer arguments may not alias each other and may not
914 alias global variables. True in Fortran.
915 This defaults to 0 for C. */
916 int flag_argument_noalias = 0;
918 /* Nonzero if we should do (language-dependent) alias analysis.
919 Typically, this analysis will assume that expressions of certain
920 types do not alias expressions of certain other types. Only used
921 if alias analysis (in general) is enabled. */
922 int flag_strict_aliasing = 0;
924 /* Instrument functions with calls at entry and exit, for profiling. */
925 int flag_instrument_function_entry_exit = 0;
927 /* Nonzero means ignore `#ident' directives. 0 means handle them.
928 On SVR4 targets, it also controls whether or not to emit a
929 string identifying the compiler. */
931 int flag_no_ident = 0;
933 /* This will perform a peephole pass before sched2. */
934 int flag_peephole2 = 0;
936 /* This will try to guess branch probabilities. */
937 int flag_guess_branch_prob = 0;
939 /* -fcheck-bounds causes gcc to generate array bounds checks.
940 For C, C++, ObjC: defaults to off.
941 For Java: defaults to on.
942 For Fortran: defaults to off. */
943 int flag_bounds_check = 0;
945 /* This will attempt to merge constant section constants, if 1 only
946 string constants and constants from constant pool, if 2 also constant
948 int flag_merge_constants = 1;
950 /* If one, renumber instruction UIDs to reduce the number of
951 unused UIDs if there are a lot of instructions. If greater than
952 one, unconditionally renumber instruction UIDs. */
953 int flag_renumber_insns = 1;
955 /* If nonzero, use the graph coloring register allocator. */
956 int flag_new_regalloc = 0;
958 /* Nonzero if we perform superblock formation. */
962 /* Nonzero if we perform whole unit at a time compilation. */
964 int flag_unit_at_a_time = 0;
966 /* Values of the -falign-* flags: how much to align labels in code.
967 0 means `use default', 1 means `don't align'.
968 For each variable, there is an _log variant which is the power
969 of two not less than the variable, for .align output. */
973 int align_loops_max_skip;
976 int align_jumps_max_skip;
978 int align_labels_log;
979 int align_labels_max_skip;
981 int align_functions_log;
983 /* Like align_functions_log above, but used by front-ends to force the
984 minimum function alignment. Zero means no alignment is forced. */
985 int force_align_functions_log;
987 /* Table of supported debugging formats. */
990 const char *const arg;
991 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
992 constant expression, we use NO_DEBUG in its place. */
993 const enum debug_info_type debug_type;
994 const int use_extensions_p;
995 const char *const description;
999 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
1000 N_("Generate debugging info in default format") },
1001 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
1002 #ifdef DBX_DEBUGGING_INFO
1003 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
1004 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
1006 #ifdef DWARF_DEBUGGING_INFO
1007 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
1008 { "dwarf+", DWARF_DEBUG, 1,
1009 N_("Generate extended DWARF-1 format debug info") },
1011 #ifdef DWARF2_DEBUGGING_INFO
1012 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
1014 #ifdef XCOFF_DEBUGGING_INFO
1015 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
1016 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
1018 #ifdef SDB_DEBUGGING_INFO
1019 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
1021 #ifdef VMS_DEBUGGING_INFO
1022 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
1029 const char *const string;
1030 int *const variable;
1032 const char *const description;
1034 lang_independent_options;
1036 /* Nonzero if signed arithmetic overflow should trap. */
1039 /* Nonzero if signed arithmetic overflow should wrap around. */
1042 /* Add or remove a leading underscore from user symbols. */
1043 int flag_leading_underscore = -1;
1045 /* The user symbol prefix after having resolved same. */
1046 const char *user_label_prefix;
1048 static const param_info lang_independent_params[] = {
1049 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1050 { OPTION, DEFAULT, HELP },
1051 #include "params.def"
1056 /* Table of language-independent -f options.
1057 STRING is the option name. VARIABLE is the address of the variable.
1058 ON_VALUE is the value to store in VARIABLE
1059 if `-fSTRING' is seen as an option.
1060 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1062 static const lang_independent_options f_options[] =
1064 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1065 N_("Perform DWARF2 duplicate elimination") },
1066 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1,
1067 N_("Perform unused type elimination in debug info") },
1068 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1069 N_("Perform unused type elimination in debug info") },
1070 {"float-store", &flag_float_store, 1,
1071 N_("Do not store floats in registers") },
1072 {"defer-pop", &flag_defer_pop, 1,
1073 N_("Defer popping functions args from stack until later") },
1074 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1075 N_("When possible do not generate stack frames") },
1076 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1077 N_("Optimize sibling and tail recursive calls") },
1078 {"tracer", &flag_tracer, 1,
1079 N_("Perform superblock formation via tail duplication") },
1080 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1081 N_("Compile whole compilation unit at a time") },
1082 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1083 N_("When running CSE, follow jumps to their targets") },
1084 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1085 N_("When running CSE, follow conditional jumps") },
1086 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1087 N_("Perform a number of minor, expensive optimizations") },
1088 {"thread-jumps", &flag_thread_jumps, 1,
1089 N_("Perform jump threading optimizations") },
1090 {"strength-reduce", &flag_strength_reduce, 1,
1091 N_("Perform strength reduction optimizations") },
1092 {"unroll-loops", &flag_unroll_loops, 1,
1093 N_("Perform loop unrolling when iteration count is known") },
1094 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1095 N_("Perform loop unrolling for all loops") },
1096 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1097 N_("Perform loop unrolling when iteration count is known") },
1098 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1099 N_("Perform loop unrolling for all loops") },
1100 {"peel-loops", &flag_peel_loops, 1,
1101 N_("Perform loop peeling") },
1102 {"unswitch-loops", &flag_unswitch_loops, 1,
1103 N_("Perform loop unswitching") },
1104 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1105 N_("Generate prefetch instructions, if available, for arrays in loops") },
1106 {"move-all-movables", &flag_move_all_movables, 1,
1107 N_("Force all loop invariant computations out of loops") },
1108 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1109 N_("Strength reduce all loop general induction variables") },
1110 {"writable-strings", &flag_writable_strings, 1,
1111 N_("Store strings in writable data section") },
1112 {"peephole", &flag_no_peephole, 0,
1113 N_("Enable machine specific peephole optimizations") },
1114 {"force-mem", &flag_force_mem, 1,
1115 N_("Copy memory operands into registers before using") },
1116 {"force-addr", &flag_force_addr, 1,
1117 N_("Copy memory address constants into regs before using") },
1118 {"function-cse", &flag_no_function_cse, 0,
1119 N_("Allow function addresses to be held in registers") },
1120 {"inline-functions", &flag_inline_functions, 1,
1121 N_("Integrate simple functions into their callers") },
1122 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1123 N_("Generate code for funcs even if they are fully inlined") },
1124 {"inline", &flag_no_inline, 0,
1125 N_("Pay attention to the 'inline' keyword") },
1126 {"keep-static-consts", &flag_keep_static_consts, 1,
1127 N_("Emit static const variables even if they are not used") },
1128 {"syntax-only", &flag_syntax_only, 1,
1129 N_("Check for syntax errors, then stop") },
1130 {"shared-data", &flag_shared_data, 1,
1131 N_("Mark data as shared rather than private") },
1132 {"caller-saves", &flag_caller_saves, 1,
1133 N_("Enable saving registers around function calls") },
1134 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1135 N_("Return 'short' aggregates in memory, not registers") },
1136 {"reg-struct-return", &flag_pcc_struct_return, 0,
1137 N_("Return 'short' aggregates in registers") },
1138 {"delayed-branch", &flag_delayed_branch, 1,
1139 N_("Attempt to fill delay slots of branch instructions") },
1140 {"gcse", &flag_gcse, 1,
1141 N_("Perform the global common subexpression elimination") },
1142 {"gcse-lm", &flag_gcse_lm, 1,
1143 N_("Perform enhanced load motion during global subexpression elimination") },
1144 {"gcse-sm", &flag_gcse_sm, 1,
1145 N_("Perform store motion after global subexpression elimination") },
1146 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1,
1147 N_("Perform branch target load optimization before prologue / epilogue threading") },
1148 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1,
1149 N_("Perform branch target load optimization after prologue / epilogue threading") },
1150 {"loop-optimize", &flag_loop_optimize, 1,
1151 N_("Perform the loop optimizations") },
1152 {"crossjumping", &flag_crossjumping, 1,
1153 N_("Perform cross-jumping optimization") },
1154 {"if-conversion", &flag_if_conversion, 1,
1155 N_("Perform conversion of conditional jumps to branchless equivalents") },
1156 {"if-conversion2", &flag_if_conversion2, 1,
1157 N_("Perform conversion of conditional jumps to conditional execution") },
1158 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1159 N_("Run CSE pass after loop optimizations") },
1160 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1161 N_("Run the loop optimizer twice") },
1162 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1163 N_("Delete useless null pointer checks") },
1164 {"schedule-insns", &flag_schedule_insns, 1,
1165 N_("Reschedule instructions before register allocation") },
1166 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1167 N_("Reschedule instructions after register allocation") },
1168 {"sched-interblock",&flag_schedule_interblock, 1,
1169 N_("Enable scheduling across basic blocks") },
1170 {"sched-spec",&flag_schedule_speculative, 1,
1171 N_("Allow speculative motion of non-loads") },
1172 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1173 N_("Allow speculative motion of some loads") },
1174 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1175 N_("Allow speculative motion of more loads") },
1176 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1177 N_("If scheduling post reload, do superblock scheduling") },
1178 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1179 N_("If scheduling post reload, do trace scheduling") },
1180 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1181 N_("Replace add,compare,branch with branch on count reg") },
1182 {"pic", &flag_pic, 1,
1183 N_("Generate position independent code, if possible") },
1184 {"PIC", &flag_pic, 2, ""},
1185 {"pie", &flag_pie, 1,
1186 N_("Generate position independent code for executables, if possible") },
1187 {"PIE", &flag_pie, 2, ""},
1188 {"exceptions", &flag_exceptions, 1,
1189 N_("Enable exception handling") },
1190 {"unwind-tables", &flag_unwind_tables, 1,
1191 N_("Just generate unwind tables for exception handling") },
1192 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1193 N_("Generate unwind tables exact at each instruction boundary") },
1194 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1195 N_("Support synchronous non-call exceptions") },
1196 {"profile-arcs", &profile_arc_flag, 1,
1197 N_("Insert arc based program profiling code") },
1198 {"test-coverage", &flag_test_coverage, 1,
1199 N_("Create data files needed by gcov") },
1200 {"branch-probabilities", &flag_branch_probabilities, 1,
1201 N_("Use profiling information for branch probabilities") },
1202 {"profile", &profile_flag, 1,
1203 N_("Enable basic program profiling code") },
1204 {"reorder-blocks", &flag_reorder_blocks, 1,
1205 N_("Reorder basic blocks to improve code placement") },
1206 {"reorder-functions", &flag_reorder_functions, 1,
1207 N_("Reorder functions to improve code placement") },
1208 {"rename-registers", &flag_rename_registers, 1,
1209 N_("Do the register renaming optimization pass") },
1210 {"cprop-registers", &flag_cprop_registers, 1,
1211 N_("Do the register copy-propagation optimization pass") },
1212 {"common", &flag_no_common, 0,
1213 N_("Do not put uninitialized globals in the common section") },
1214 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1215 N_("Do not generate .size directives") },
1216 {"function-sections", &flag_function_sections, 1,
1217 N_("place each function into its own section") },
1218 {"data-sections", &flag_data_sections, 1,
1219 N_("place data items into their own section") },
1220 {"verbose-asm", &flag_verbose_asm, 1,
1221 N_("Add extra commentary to assembler output") },
1222 {"gnu-linker", &flag_gnu_linker, 1,
1223 N_("Output GNU ld formatted global initializers") },
1224 {"regmove", &flag_regmove, 1,
1225 N_("Enables a register move optimization") },
1226 {"optimize-register-move", &flag_regmove, 1,
1227 N_("Do the full regmove optimization pass") },
1228 {"pack-struct", &flag_pack_struct, 1,
1229 N_("Pack structure members together without holes") },
1230 {"stack-check", &flag_stack_check, 1,
1231 N_("Insert stack checking code into the program") },
1232 {"argument-alias", &flag_argument_noalias, 0,
1233 N_("Specify that arguments may alias each other & globals") },
1234 {"argument-noalias", &flag_argument_noalias, 1,
1235 N_("Assume arguments may alias globals but not each other") },
1236 {"argument-noalias-global", &flag_argument_noalias, 2,
1237 N_("Assume arguments do not alias each other or globals") },
1238 {"strict-aliasing", &flag_strict_aliasing, 1,
1239 N_("Assume strict aliasing rules apply") },
1240 {"align-loops", &align_loops, 0,
1241 N_("Align the start of loops") },
1242 {"align-jumps", &align_jumps, 0,
1243 N_("Align labels which are only reached by jumping") },
1244 {"align-labels", &align_labels, 0,
1245 N_("Align all labels") },
1246 {"align-functions", &align_functions, 0,
1247 N_("Align the start of functions") },
1248 {"merge-constants", &flag_merge_constants, 1,
1249 N_("Attempt to merge identical constants across compilation units") },
1250 {"merge-all-constants", &flag_merge_constants, 2,
1251 N_("Attempt to merge identical constants and constant variables") },
1252 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1253 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1254 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1255 N_("Instrument function entry/exit with profiling calls") },
1256 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1257 N_("Put zero initialized data in the bss section") },
1258 {"ssa", &flag_ssa, 1,
1259 N_("Enable SSA optimizations") },
1260 {"ssa-ccp", &flag_ssa_ccp, 1,
1261 N_("Enable SSA conditional constant propagation") },
1262 {"ssa-dce", &flag_ssa_dce, 1,
1263 N_("Enable aggressive SSA dead code elimination") },
1264 {"leading-underscore", &flag_leading_underscore, 1,
1265 N_("External symbols have a leading underscore") },
1266 {"ident", &flag_no_ident, 0,
1267 N_("Process #ident directives") },
1268 { "peephole2", &flag_peephole2, 1,
1269 N_("Enables an rtl peephole pass run before sched2") },
1270 {"finite-math-only", &flag_finite_math_only, 1,
1271 N_("Assume no NaNs or +-Infs are generated") },
1272 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1273 N_("Enables guessing of branch probabilities") },
1274 {"math-errno", &flag_errno_math, 1,
1275 N_("Set errno after built-in math functions") },
1276 {"trapping-math", &flag_trapping_math, 1,
1277 N_("Floating-point operations can trap") },
1278 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1279 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1280 {"signaling-nans", &flag_signaling_nans, 1,
1281 N_("Disable optimizations observable by IEEE signaling NaNs") },
1282 {"bounds-check", &flag_bounds_check, 1,
1283 N_("Generate code to check bounds before indexing arrays") },
1284 {"single-precision-constant", &flag_single_precision_constant, 1,
1285 N_("Convert floating point constant to single precision constant") },
1286 {"time-report", &time_report, 1,
1287 N_("Report time taken by each compiler pass at end of run") },
1288 {"mem-report", &mem_report, 1,
1289 N_("Report on permanent memory allocation at end of run") },
1290 { "trapv", &flag_trapv, 1,
1291 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1292 { "wrapv", &flag_wrapv, 1,
1293 N_("Assume signed arithmetic overflow wraps around") },
1294 { "new-ra", &flag_new_regalloc, 1,
1295 N_("Use graph coloring register allocation.") },
1298 /* Table of language-specific options. */
1300 static const struct lang_opt
1302 const char *const option;
1303 const char *const description;
1305 documented_lang_options[] =
1307 /* In order not to overload the --help output, the convention
1308 used here is to only describe those options which are not
1309 enabled by default. */
1312 N_("Compile just for ISO C90") },
1314 N_("Determine language standard") },
1316 { "-fsigned-bitfields", "" },
1317 { "-funsigned-bitfields",
1318 N_("Make bit-fields by unsigned by default") },
1319 { "-fno-signed-bitfields", "" },
1320 { "-fno-unsigned-bitfields","" },
1322 N_("Make 'char' be signed by default") },
1323 { "-funsigned-char",
1324 N_("Make 'char' be unsigned by default") },
1325 { "-fno-signed-char", "" },
1326 { "-fno-unsigned-char", "" },
1330 N_("Do not recognize the 'asm' keyword") },
1331 { "-fbuiltin", "" },
1333 N_("Do not recognize any built in functions") },
1335 N_("Assume normal C execution environment") },
1336 { "-fno-hosted", "" },
1338 N_("Assume that standard libraries & main might not exist") },
1339 { "-fno-freestanding", "" },
1340 { "-fcond-mismatch",
1341 N_("Allow different types as args of ? operator") },
1342 { "-fno-cond-mismatch", "" },
1343 { "-fdollars-in-identifiers",
1344 N_("Allow the use of $ inside identifiers") },
1345 { "-fno-dollars-in-identifiers", "" },
1346 { "-fpreprocessed", "" },
1347 { "-fno-preprocessed", "" },
1349 N_("Use the same size for double as for float") },
1350 { "-fno-short-double", "" },
1352 N_("Use the smallest fitting integer to hold enums") },
1353 { "-fno-short-enums", "" },
1355 N_("Override the underlying type for wchar_t to `unsigned short'") },
1356 { "-fno-short-wchar", "" },
1359 N_("Enable most warning messages") },
1360 { "-Wbad-function-cast",
1361 N_("Warn about casting functions to incompatible types") },
1362 { "-Wno-bad-function-cast", "" },
1363 { "-Wmissing-format-attribute",
1364 N_("Warn about functions which might be candidates for format attributes") },
1365 { "-Wno-missing-format-attribute", "" },
1367 N_("Warn about casts which discard qualifiers") },
1368 { "-Wno-cast-qual", "" },
1369 { "-Wchar-subscripts",
1370 N_("Warn about subscripts whose type is 'char'") },
1371 { "-Wno-char-subscripts", "" },
1373 N_("Warn if nested comments are detected") },
1374 { "-Wno-comment", "" },
1376 N_("Warn if nested comments are detected") },
1377 { "-Wno-comments", "" },
1379 N_("Warn about possibly confusing type conversions") },
1380 { "-Wno-conversion", "" },
1381 { "-Wdiv-by-zero", "" },
1382 { "-Wno-div-by-zero",
1383 N_("Do not warn about compile-time integer division by zero") },
1385 N_("Warn about testing equality of floating point numbers") },
1386 { "-Wno-float-equal", "" },
1388 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1389 { "-Wno-format", "" },
1390 { "-Wformat-extra-args", "" },
1391 { "-Wno-format-extra-args",
1392 N_("Don't warn about too many arguments to format functions") },
1393 { "-Wformat-nonliteral",
1394 N_("Warn about non-string-literal format strings") },
1395 { "-Wno-format-nonliteral", "" },
1396 { "-Wformat-security",
1397 N_("Warn about possible security problems with format functions") },
1398 { "-Wno-format-security", "" },
1399 { "-Wformat-y2k", "" },
1400 { "-Wno-format-y2k",
1401 N_("Don't warn about strftime formats yielding 2 digit years") },
1402 { "-Wimplicit-function-declaration",
1403 N_("Warn about implicit function declarations") },
1404 { "-Wno-implicit-function-declaration", "" },
1405 { "-Werror-implicit-function-declaration", "" },
1407 N_("Warn when a declaration does not specify a type") },
1408 { "-Wno-implicit-int", "" },
1409 { "-Wimplicit", "" },
1410 { "-Wno-implicit", "" },
1412 N_("Warn about the use of the #import directive") },
1413 { "-Wno-import", "" },
1415 N_("Warn about PCH files that are found but not used") },
1416 { "-Wlong-long","" },
1418 N_("Do not warn about using 'long long' when -pedantic") },
1420 N_("Warn about suspicious declarations of main") },
1421 { "-Wno-main", "" },
1422 { "-Wmissing-braces",
1423 N_("Warn about possibly missing braces around initializers") },
1424 { "-Wno-missing-braces", "" },
1425 { "-Wmissing-declarations",
1426 N_("Warn about global funcs without previous declarations") },
1427 { "-Wno-missing-declarations", "" },
1428 { "-Wmissing-prototypes",
1429 N_("Warn about global funcs without prototypes") },
1430 { "-Wno-missing-prototypes", "" },
1432 N_("Warn about use of multicharacter literals") },
1433 { "-Wno-multichar", "" },
1434 { "-Wnested-externs",
1435 N_("Warn about externs not at file scope level") },
1436 { "-Wno-nested-externs", "" },
1438 N_("Warn about possible missing parentheses") },
1439 { "-Wno-parentheses", "" },
1440 { "-Wpointer-arith",
1441 N_("Warn about function pointer arithmetic") },
1442 { "-Wno-pointer-arith", "" },
1443 { "-Wredundant-decls",
1444 N_("Warn about multiple declarations of the same object") },
1445 { "-Wno-redundant-decls", "" },
1447 N_("Warn whenever a function's return-type defaults to int") },
1448 { "-Wno-return-type", "" },
1449 { "-Wsequence-point",
1450 N_("Warn about possible violations of sequence point rules") },
1451 { "-Wno-sequence-point", "" },
1453 N_("Warn about signed/unsigned comparisons") },
1454 { "-Wno-sign-compare", "" },
1455 { "-Wstrict-prototypes",
1456 N_("Warn about non-prototyped function decls") },
1457 { "-Wno-strict-prototypes", "" },
1459 N_("Warn about constructs whose meanings change in ISO C") },
1460 { "-Wno-traditional", "" },
1462 N_("Warn when trigraphs are encountered") },
1463 { "-Wno-trigraphs", "" },
1465 { "-Wno-undef", "" },
1466 { "-Wunknown-pragmas",
1467 N_("Warn about unrecognized pragmas") },
1468 { "-Wno-unknown-pragmas", "" },
1469 { "-Wwrite-strings",
1470 N_("Mark strings as 'const char *'") },
1471 { "-Wno-write-strings", "" },
1473 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1475 #include "options_.h"
1479 /* Here is a table, controlled by the tm.h file, listing each -m switch
1480 and which bits in `target_switches' it should set or clear.
1481 If VALUE is positive, it is bits to set.
1482 If VALUE is negative, -VALUE is bits to clear.
1483 (The sign bit is not used so there is no confusion.) */
1487 const char *const name;
1489 const char *const description;
1491 target_switches[] = TARGET_SWITCHES;
1493 /* This table is similar, but allows the switch to have a value. */
1495 #ifdef TARGET_OPTIONS
1498 const char *const prefix;
1499 const char **const variable;
1500 const char *const description;
1501 const char *const value;
1503 target_options[] = TARGET_OPTIONS;
1506 /* Nonzero means warn about function definitions that default the return type
1507 or that use a null return and have a return-type other than void. */
1509 int warn_return_type;
1511 /* Output files for assembler code (real compiler output)
1512 and debugging dumps. */
1515 FILE *aux_info_file;
1516 FILE *rtl_dump_file = NULL;
1517 FILE *cgraph_dump_file = NULL;
1519 /* Set up a default flag_random_seed and local_tick, unless the user
1520 already specified one. */
1525 if (!flag_random_seed)
1527 unsigned HOST_WIDE_INT value;
1528 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1530 /* Get some more or less random data. */
1531 #ifdef HAVE_GETTIMEOFDAY
1535 gettimeofday (&tv, NULL);
1536 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1540 time_t now = time (NULL);
1542 if (now != (time_t)-1)
1543 local_tick = (unsigned) now;
1546 value = local_tick ^ getpid ();
1548 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1549 flag_random_seed = random_seed;
1551 else if (!local_tick)
1556 /* Decode the string P as an integral parameter.
1557 If the string is indeed an integer return its numeric value else
1558 issue an Invalid Option error for the option PNAME and return DEFVAL.
1559 If PNAME is zero just return DEFVAL, do not call error. */
1562 read_integral_parameter (const char *p, const char *pname, const int defval)
1564 const char *endp = p;
1568 if (ISDIGIT (*endp))
1577 error ("invalid option argument `%s'", pname);
1584 /* Return the logarithm of X, base 2, considering X unsigned,
1585 if X is a power of 2. Otherwise, returns -1.
1587 This should be used via the `exact_log2' macro. */
1590 exact_log2_wide (unsigned HOST_WIDE_INT x)
1593 /* Test for 0 or a power of 2. */
1594 if (x == 0 || x != (x & -x))
1596 while ((x >>= 1) != 0)
1601 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1602 If X is 0, return -1.
1604 This should be used via the floor_log2 macro. */
1607 floor_log2_wide (unsigned HOST_WIDE_INT x)
1616 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1617 into ICE messages, which is much more user friendly. In case the
1618 error printer crashes, reset the signal to prevent infinite recursion. */
1621 crash_signal (int signo)
1623 signal (signo, SIG_DFL);
1624 internal_error ("%s", strsignal (signo));
1627 /* Arrange to dump core on error. (The regular error message is still
1628 printed first, except in the case of abort().) */
1631 setup_core_dumping (void)
1634 signal (SIGABRT, SIG_DFL);
1636 #if defined(HAVE_SETRLIMIT)
1639 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1640 fatal_error ("getting core file size maximum limit: %m");
1641 rlim.rlim_cur = rlim.rlim_max;
1642 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1643 fatal_error ("setting core file size limit to maximum: %m");
1646 diagnostic_abort_on_error (global_dc);
1650 /* Strip off a legitimate source ending from the input string NAME of
1651 length LEN. Rather than having to know the names used by all of
1652 our front ends, we strip off an ending of a period followed by
1653 up to five characters. (Java uses ".class".) */
1656 strip_off_ending (char *name, int len)
1659 for (i = 2; i < 6 && len > i; i++)
1661 if (name[len - i] == '.')
1663 name[len - i] = '\0';
1669 /* Output a quoted string. */
1672 output_quoted_string (FILE *asm_file, const char *string)
1674 #ifdef OUTPUT_QUOTED_STRING
1675 OUTPUT_QUOTED_STRING (asm_file, string);
1679 putc ('\"', asm_file);
1680 while ((c = *string++) != 0)
1684 if (c == '\"' || c == '\\')
1685 putc ('\\', asm_file);
1689 fprintf (asm_file, "\\%03o", (unsigned char) c);
1691 putc ('\"', asm_file);
1695 /* Output a file name in the form wanted by System V. */
1698 output_file_directive (FILE *asm_file, const char *input_name)
1700 int len = strlen (input_name);
1701 const char *na = input_name + len;
1703 /* NA gets INPUT_NAME sans directory names. */
1704 while (na > input_name)
1706 if (IS_DIR_SEPARATOR (na[-1]))
1711 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1712 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1714 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1715 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1717 fprintf (asm_file, "\t.file\t");
1718 output_quoted_string (asm_file, na);
1719 fputc ('\n', asm_file);
1724 /* Routine to open a dump file. Return true if the dump file is enabled. */
1727 open_dump_file (enum dump_file_index index, tree decl)
1730 const char *open_arg;
1733 if (! dump_file[index].enabled)
1736 timevar_push (TV_DUMP);
1737 if (rtl_dump_file != NULL)
1738 fclose (rtl_dump_file);
1740 sprintf (seq, DUMPFILE_FORMAT, index);
1742 if (! dump_file[index].initialized)
1744 /* If we've not initialized the files, do so now. */
1745 if (graph_dump_format != no_graph
1746 && dump_file[index].graph_dump_p)
1748 dump_name = concat (seq, dump_file[index].extension, NULL);
1749 clean_graph_dump_file (dump_base_name, dump_name);
1752 dump_file[index].initialized = 1;
1758 dump_name = concat (dump_base_name, seq,
1759 dump_file[index].extension, NULL);
1761 rtl_dump_file = fopen (dump_name, open_arg);
1762 if (rtl_dump_file == NULL)
1763 fatal_error ("can't open %s: %m", dump_name);
1768 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1769 (*lang_hooks.decl_printable_name) (decl, 2),
1770 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1772 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1773 ? " (unlikely executed)"
1776 timevar_pop (TV_DUMP);
1780 /* Routine to close a dump file. */
1783 close_dump_file (enum dump_file_index index,
1784 void (*func) (FILE *, rtx),
1787 if (! rtl_dump_file)
1790 timevar_push (TV_DUMP);
1792 && graph_dump_format != no_graph
1793 && dump_file[index].graph_dump_p)
1798 sprintf (seq, DUMPFILE_FORMAT, index);
1799 suffix = concat (seq, dump_file[index].extension, NULL);
1800 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1805 func (rtl_dump_file, insns);
1807 fflush (rtl_dump_file);
1808 fclose (rtl_dump_file);
1810 rtl_dump_file = NULL;
1811 timevar_pop (TV_DUMP);
1814 /* Do any final processing required for the declarations in VEC, of
1815 which there are LEN. We write out inline functions and variables
1816 that have been deferred until this point, but which are required.
1817 Returns nonzero if anything was put out. */
1820 wrapup_global_declarations (tree *vec, int len)
1825 int output_something = 0;
1827 for (i = 0; i < len; i++)
1831 /* We're not deferring this any longer. Assignment is
1832 conditional to avoid needlessly dirtying PCH pages. */
1833 if (DECL_DEFER_OUTPUT (decl) != 0)
1834 DECL_DEFER_OUTPUT (decl) = 0;
1836 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1837 (*lang_hooks.finish_incomplete_decl) (decl);
1840 /* Now emit any global variables or functions that we have been
1841 putting off. We need to loop in case one of the things emitted
1842 here references another one which comes earlier in the list. */
1846 for (i = 0; i < len; i++)
1850 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1853 /* Don't write out static consts, unless we still need them.
1855 We also keep static consts if not optimizing (for debugging),
1856 unless the user specified -fno-keep-static-consts.
1857 ??? They might be better written into the debug information.
1858 This is possible when using DWARF.
1860 A language processor that wants static constants to be always
1861 written out (even if it is not used) is responsible for
1862 calling rest_of_decl_compilation itself. E.g. the C front-end
1863 calls rest_of_decl_compilation from finish_decl.
1864 One motivation for this is that is conventional in some
1865 environments to write things like:
1866 static const char rcsid[] = "... version string ...";
1867 intending to force the string to be in the executable.
1869 A language processor that would prefer to have unneeded
1870 static constants "optimized away" would just defer writing
1871 them out until here. E.g. C++ does this, because static
1872 constants are often defined in header files.
1874 ??? A tempting alternative (for both C and C++) would be
1875 to force a constant to be written if and only if it is
1876 defined in a main file, as opposed to an include file. */
1878 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1882 if (flag_unit_at_a_time
1883 && cgraph_varpool_node (decl)->finalized)
1885 else if (flag_unit_at_a_time
1886 && (TREE_USED (decl)
1887 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1889 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1891 else if (DECL_COMDAT (decl))
1893 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1894 && (optimize || !flag_keep_static_consts
1895 || DECL_ARTIFICIAL (decl)))
1901 rest_of_decl_compilation (decl, NULL, 1, 1);
1905 if (TREE_CODE (decl) == FUNCTION_DECL
1906 && DECL_INITIAL (decl) != 0
1907 && DECL_SAVED_INSNS (decl) != 0
1908 && (flag_keep_inline_functions
1909 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1910 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1913 output_inline_function (decl);
1918 output_something = 1;
1922 return output_something;
1925 /* Issue appropriate warnings for the global declarations in VEC (of
1926 which there are LEN). Output debugging information for them. */
1929 check_global_declarations (tree *vec, int len)
1934 for (i = 0; i < len; i++)
1938 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1939 && ! TREE_ASM_WRITTEN (decl))
1940 /* Cancel the RTL for this decl so that, if debugging info
1941 output for global variables is still to come,
1942 this one will be omitted. */
1943 SET_DECL_RTL (decl, NULL_RTX);
1945 /* Warn about any function
1946 declared static but not defined.
1947 We don't warn about variables,
1948 because many programs have static variables
1949 that exist only to get some text into the object file. */
1950 if (TREE_CODE (decl) == FUNCTION_DECL
1951 && (warn_unused_function
1952 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1953 && DECL_INITIAL (decl) == 0
1954 && DECL_EXTERNAL (decl)
1955 && ! DECL_ARTIFICIAL (decl)
1956 && ! TREE_PUBLIC (decl))
1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1959 pedwarn_with_decl (decl,
1960 "`%s' used but never defined");
1962 warning_with_decl (decl,
1963 "`%s' declared `static' but never defined");
1964 /* This symbol is effectively an "extern" declaration now. */
1965 TREE_PUBLIC (decl) = 1;
1966 assemble_external (decl);
1969 /* Warn about static fns or vars defined but not used. */
1970 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1971 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1972 && ! TREE_USED (decl)
1973 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1974 to handle multiple external decls in different scopes. */
1975 && ! TREE_USED (DECL_NAME (decl))
1976 && ! DECL_EXTERNAL (decl)
1977 && ! TREE_PUBLIC (decl)
1978 /* A volatile variable might be used in some non-obvious way. */
1979 && ! TREE_THIS_VOLATILE (decl)
1980 /* Global register variables must be declared to reserve them. */
1981 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1982 /* Otherwise, ask the language. */
1983 && (*lang_hooks.decls.warn_unused_global) (decl))
1984 warning_with_decl (decl, "`%s' defined but not used");
1986 /* Avoid confusing the debug information machinery when there are
1988 if (errorcount == 0 && sorrycount == 0)
1990 timevar_push (TV_SYMOUT);
1991 (*debug_hooks->global_decl) (decl);
1992 timevar_pop (TV_SYMOUT);
1997 /* Save the current INPUT_LOCATION on the top entry in the
1998 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1999 INPUT_LOCATION accordingly. */
2002 push_srcloc (const char *file, int line)
2004 struct file_stack *fs;
2006 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2007 fs->location = input_location;
2008 fs->next = input_file_stack;
2009 input_filename = file;
2011 input_file_stack = fs;
2012 input_file_stack_tick++;
2015 /* Pop the top entry off the stack of presently open source files.
2016 Restore the INPUT_LOCATION from the new topmost entry on the
2022 struct file_stack *fs;
2024 fs = input_file_stack;
2025 input_location = fs->location;
2026 input_file_stack = fs->next;
2028 input_file_stack_tick++;
2031 /* Compile an entire translation unit. Write a file of assembly
2032 output and various debugging dumps. */
2037 /* Initialize yet another pass. */
2039 init_final (main_input_filename);
2040 coverage_init (aux_base_name);
2042 timevar_push (TV_PARSE);
2044 /* Call the parser, which parses the entire file (calling
2045 rest_of_compilation for each function). */
2046 (*lang_hooks.parse_file) (set_yydebug);
2048 /* In case there were missing block closers,
2049 get us back to the global binding level. */
2050 (*lang_hooks.clear_binding_stack) ();
2052 /* Compilation is now finished except for writing
2053 what's left of the symbol table output. */
2054 timevar_pop (TV_PARSE);
2056 if (flag_syntax_only)
2059 (*lang_hooks.decls.final_write_globals)();
2061 cgraph_varpool_assemble_pending_decls ();
2063 /* This must occur after the loop to output deferred functions.
2064 Else the coverage initializer would not be emitted if all the
2065 functions in this compilation unit were deferred. */
2068 /* Write out any pending weak symbol declarations. */
2072 /* Do dbx symbols. */
2073 timevar_push (TV_SYMOUT);
2075 #ifdef DWARF2_UNWIND_INFO
2076 if (dwarf2out_do_frame ())
2077 dwarf2out_frame_finish ();
2080 (*debug_hooks->finish) (main_input_filename);
2081 timevar_pop (TV_SYMOUT);
2083 /* Output some stuff at end of file if nec. */
2085 dw2_output_indirect_constants ();
2087 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2089 timevar_push (TV_DUMP);
2090 open_dump_file (DFI_bp, NULL);
2094 close_dump_file (DFI_bp, NULL, NULL_RTX);
2095 timevar_pop (TV_DUMP);
2098 targetm.asm_out.file_end ();
2100 /* Attach a special .ident directive to the end of the file to identify
2101 the version of GCC which compiled this code. The format of the .ident
2102 string is patterned after the ones produced by native SVR4 compilers. */
2105 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2106 IDENT_ASM_OP, version_string);
2109 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2111 timevar_push (TV_DUMP);
2112 dump_combine_total_stats (rtl_dump_file);
2113 close_dump_file (DFI_combine, NULL, NULL_RTX);
2114 timevar_pop (TV_DUMP);
2118 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2119 and TYPE_DECL nodes.
2121 This does nothing for local (non-static) variables, unless the
2122 variable is a register variable with an ASMSPEC. In that case, or
2123 if the variable is not an automatic, it sets up the RTL and
2124 outputs any assembler code (label definition, storage allocation
2125 and initialization).
2127 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2128 the assembler symbol name to be used. TOP_LEVEL is nonzero
2129 if this declaration is not within a function. */
2132 rest_of_decl_compilation (tree decl,
2133 const char *asmspec,
2137 /* We deferred calling assemble_alias so that we could collect
2138 other attributes such as visibility. Emit the alias now. */
2141 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2144 alias = TREE_VALUE (TREE_VALUE (alias));
2145 alias = get_identifier (TREE_STRING_POINTER (alias));
2146 assemble_alias (decl, alias);
2150 /* Forward declarations for nested functions are not "external",
2151 but we need to treat them as if they were. */
2152 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2153 || TREE_CODE (decl) == FUNCTION_DECL)
2155 timevar_push (TV_VARCONST);
2158 make_decl_rtl (decl, asmspec);
2160 /* Don't output anything when a tentative file-scope definition
2161 is seen. But at end of compilation, do output code for them. */
2162 if (at_end || !DECL_DEFER_OUTPUT (decl))
2164 if (flag_unit_at_a_time && !cgraph_global_info_ready
2165 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
2166 cgraph_varpool_finalize_decl (decl);
2168 assemble_variable (decl, top_level, at_end, 0);
2171 #ifdef ASM_FINISH_DECLARE_OBJECT
2172 if (decl == last_assemble_variable_decl)
2174 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2179 timevar_pop (TV_VARCONST);
2181 else if (DECL_REGISTER (decl) && asmspec != 0)
2183 if (decode_reg_name (asmspec) >= 0)
2185 SET_DECL_RTL (decl, NULL_RTX);
2186 make_decl_rtl (decl, asmspec);
2190 error ("invalid register name `%s' for register variable", asmspec);
2191 DECL_REGISTER (decl) = 0;
2196 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2197 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2198 && TREE_CODE (decl) == TYPE_DECL)
2200 timevar_push (TV_SYMOUT);
2201 dbxout_symbol (decl, 0);
2202 timevar_pop (TV_SYMOUT);
2205 #ifdef SDB_DEBUGGING_INFO
2206 else if (write_symbols == SDB_DEBUG && top_level
2207 && TREE_CODE (decl) == TYPE_DECL)
2209 timevar_push (TV_SYMOUT);
2210 sdbout_symbol (decl, 0);
2211 timevar_pop (TV_SYMOUT);
2214 #ifdef DWARF2_DEBUGGING_INFO
2215 else if ((write_symbols == DWARF2_DEBUG
2216 || write_symbols == VMS_AND_DWARF2_DEBUG)
2218 && TREE_CODE (decl) == TYPE_DECL)
2220 timevar_push (TV_SYMOUT);
2221 dwarf2out_decl (decl);
2222 timevar_pop (TV_SYMOUT);
2227 /* Called after finishing a record, union or enumeral type. */
2230 rest_of_type_compilation (
2231 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2232 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2236 tree type ATTRIBUTE_UNUSED,
2237 int toplev ATTRIBUTE_UNUSED
2241 /* Avoid confusing the debug information machinery when there are
2243 if (errorcount != 0 || sorrycount != 0)
2246 timevar_push (TV_SYMOUT);
2247 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2248 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2249 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2251 #ifdef SDB_DEBUGGING_INFO
2252 if (write_symbols == SDB_DEBUG)
2253 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2255 #ifdef DWARF2_DEBUGGING_INFO
2256 if ((write_symbols == DWARF2_DEBUG
2257 || write_symbols == VMS_AND_DWARF2_DEBUG)
2259 dwarf2out_decl (TYPE_STUB_DECL (type));
2261 timevar_pop (TV_SYMOUT);
2264 /* Turn the RTL into assembly. */
2266 rest_of_handle_final (tree decl, rtx insns)
2268 timevar_push (TV_FINAL);
2273 /* Get the function's name, as described by its RTL. This may be
2274 different from the DECL_NAME name used in the source file. */
2276 x = DECL_RTL (decl);
2277 if (GET_CODE (x) != MEM)
2280 if (GET_CODE (x) != SYMBOL_REF)
2282 fnname = XSTR (x, 0);
2284 assemble_start_function (decl, fnname);
2285 final_start_function (insns, asm_out_file, optimize);
2286 final (insns, asm_out_file, optimize, 0);
2287 final_end_function ();
2289 #ifdef IA64_UNWIND_INFO
2290 /* ??? The IA-64 ".handlerdata" directive must be issued before
2291 the ".endp" directive that closes the procedure descriptor. */
2292 output_function_exception_table ();
2295 assemble_end_function (decl, fnname);
2297 #ifndef IA64_UNWIND_INFO
2298 /* Otherwise, it feels unclean to switch sections in the middle. */
2299 output_function_exception_table ();
2303 fflush (asm_out_file);
2305 /* Release all memory allocated by flow. */
2306 free_basic_block_vars (0);
2308 /* Release all memory held by regsets now. */
2309 regset_release_memory ();
2311 timevar_pop (TV_FINAL);
2317 /* Run delay slot optimization. */
2319 rest_of_handle_delay_slots (tree decl, rtx insns)
2321 timevar_push (TV_DBR_SCHED);
2322 open_dump_file (DFI_dbr, decl);
2324 dbr_schedule (insns, rtl_dump_file);
2326 close_dump_file (DFI_dbr, print_rtl, insns);
2327 timevar_pop (TV_DBR_SCHED);
2334 /* Convert register usage from flat register file usage to a stack
2337 rest_of_handle_stack_regs (tree decl, rtx insns)
2339 timevar_push (TV_REG_STACK);
2340 open_dump_file (DFI_stack, decl);
2342 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2344 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2345 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2346 && flag_reorder_blocks)
2348 reorder_basic_blocks ();
2349 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2353 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2354 timevar_pop (TV_REG_STACK);
2361 /* Machine independent reorg pass. */
2363 rest_of_handle_machine_reorg (tree decl, rtx insns)
2365 timevar_push (TV_MACH_DEP);
2366 open_dump_file (DFI_mach, decl);
2368 (*targetm.machine_dependent_reorg) ();
2370 close_dump_file (DFI_mach, print_rtl, insns);
2371 timevar_pop (TV_MACH_DEP);
2377 /* Run new register allocator. Return TRUE if we must exit
2378 rest_of_compilation upon return. */
2380 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2384 delete_trivially_dead_insns (insns, max_reg_num ());
2387 timevar_pop (TV_LOCAL_ALLOC);
2388 if (dump_file[DFI_lreg].enabled)
2390 timevar_push (TV_DUMP);
2392 close_dump_file (DFI_lreg, NULL, NULL);
2393 timevar_pop (TV_DUMP);
2396 /* XXX clean up the whole mess to bring live info in shape again. */
2397 timevar_push (TV_GLOBAL_ALLOC);
2398 open_dump_file (DFI_greg, decl);
2400 build_insn_chain (insns);
2401 failure = reload (insns, 0);
2403 timevar_pop (TV_GLOBAL_ALLOC);
2405 if (dump_file[DFI_greg].enabled)
2407 timevar_push (TV_DUMP);
2409 dump_global_regs (rtl_dump_file);
2411 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2412 timevar_pop (TV_DUMP);
2418 reload_completed = 1;
2424 /* Run old register allocator. Return TRUE if we must exit
2425 rest_of_compilation upon return. */
2427 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2431 /* Allocate the reg_renumber array. */
2432 allocate_reg_info (max_regno, FALSE, TRUE);
2434 /* And the reg_equiv_memory_loc array. */
2435 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
2437 allocate_initial_values (reg_equiv_memory_loc);
2439 regclass (insns, max_reg_num (), rtl_dump_file);
2440 *rebuild_notes = local_alloc ();
2442 timevar_pop (TV_LOCAL_ALLOC);
2444 if (dump_file[DFI_lreg].enabled)
2446 timevar_push (TV_DUMP);
2448 dump_flow_info (rtl_dump_file);
2449 dump_local_alloc (rtl_dump_file);
2451 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2452 timevar_pop (TV_DUMP);
2457 timevar_push (TV_GLOBAL_ALLOC);
2458 open_dump_file (DFI_greg, decl);
2460 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2461 pass fixing up any insns that are invalid. */
2464 failure = global_alloc (rtl_dump_file);
2467 build_insn_chain (insns);
2468 failure = reload (insns, 0);
2471 timevar_pop (TV_GLOBAL_ALLOC);
2473 if (dump_file[DFI_greg].enabled)
2475 timevar_push (TV_DUMP);
2477 dump_global_regs (rtl_dump_file);
2479 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2480 timevar_pop (TV_DUMP);
2486 /* Run the regrename and cprop passes. */
2488 rest_of_handle_regrename (tree decl, rtx insns)
2490 timevar_push (TV_RENAME_REGISTERS);
2491 open_dump_file (DFI_rnreg, decl);
2493 if (flag_rename_registers)
2494 regrename_optimize ();
2495 if (flag_cprop_registers)
2496 copyprop_hardreg_forward ();
2498 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2499 timevar_pop (TV_RENAME_REGISTERS);
2502 /* Reorder basic blocks. */
2504 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2506 timevar_push (TV_REORDER_BLOCKS);
2507 open_dump_file (DFI_bbro, decl);
2509 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2510 splitting possibly introduced more crossjumping opportunities. */
2511 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2512 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2514 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2516 if (flag_reorder_blocks)
2517 reorder_basic_blocks ();
2518 if (flag_reorder_blocks
2519 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2520 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2522 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2523 timevar_pop (TV_REORDER_BLOCKS);
2526 #ifdef INSN_SCHEDULING
2527 /* Run instruction scheduler. */
2529 rest_of_handle_sched (tree decl, rtx insns)
2531 timevar_push (TV_SCHED);
2533 /* Print function header into sched dump now
2534 because doing the sched analysis makes some of the dump. */
2535 if (optimize > 0 && flag_schedule_insns)
2537 open_dump_file (DFI_sched, decl);
2539 /* Do control and data sched analysis,
2540 and write some of the results to dump file. */
2542 schedule_insns (rtl_dump_file);
2544 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2546 timevar_pop (TV_SCHED);
2551 /* Run second scheduling pass after reload. */
2553 rest_of_handle_sched2 (tree decl, rtx insns)
2555 timevar_push (TV_SCHED2);
2556 open_dump_file (DFI_sched2, decl);
2558 /* Do control and data sched analysis again,
2559 and write some more of the results to dump file. */
2561 split_all_insns (1);
2563 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2565 schedule_ebbs (rtl_dump_file);
2566 /* No liveness updating code yet, but it should be easy to do.
2567 reg-stack recompute the liveness when needed for now. */
2568 count_or_remove_death_notes (NULL, 1);
2569 cleanup_cfg (CLEANUP_EXPENSIVE);
2572 schedule_insns (rtl_dump_file);
2574 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2575 timevar_pop (TV_SCHED2);
2581 /* Register allocation pre-pass, to reduce number of moves necessary
2582 for two-address machines. */
2584 rest_of_handle_regmove (tree decl, rtx insns)
2586 timevar_push (TV_REGMOVE);
2587 open_dump_file (DFI_regmove, decl);
2589 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2591 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2592 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2593 timevar_pop (TV_REGMOVE);
2600 rest_of_handle_tracer (tree decl, rtx insns)
2602 timevar_push (TV_TRACER);
2603 open_dump_file (DFI_tracer, decl);
2605 dump_flow_info (rtl_dump_file);
2607 cleanup_cfg (CLEANUP_EXPENSIVE);
2608 reg_scan (insns, max_reg_num (), 0);
2609 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2610 timevar_pop (TV_TRACER);
2613 /* If-conversion and CFG cleanup. */
2615 rest_of_handle_if_conversion (tree decl, rtx insns)
2617 open_dump_file (DFI_ce1, decl);
2618 if (flag_if_conversion)
2620 timevar_push (TV_IFCVT);
2622 dump_flow_info (rtl_dump_file);
2623 cleanup_cfg (CLEANUP_EXPENSIVE);
2624 reg_scan (insns, max_reg_num (), 0);
2626 timevar_pop (TV_IFCVT);
2628 timevar_push (TV_JUMP);
2629 cleanup_cfg (CLEANUP_EXPENSIVE);
2630 reg_scan (insns, max_reg_num (), 0);
2631 timevar_pop (TV_JUMP);
2632 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2635 /* Rerun if-conversion, as combine may have simplified things enough
2636 to now meet sequence length restrictions. */
2638 rest_of_handle_if_after_combine (tree decl, rtx insns)
2640 timevar_push (TV_IFCVT);
2641 open_dump_file (DFI_ce2, decl);
2647 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2648 timevar_pop (TV_IFCVT);
2651 /* Do branch profiling and static profile estimation passes. */
2653 rest_of_handle_branch_prob (tree decl, rtx insns)
2657 timevar_push (TV_BRANCH_PROB);
2658 open_dump_file (DFI_bp, decl);
2659 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2662 /* Discover and record the loop depth at the head of each basic
2663 block. The loop infrastructure does the real job for us. */
2664 flow_loops_find (&loops, LOOP_TREE);
2667 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2669 /* Estimate using heuristics if no profiling info is available. */
2670 if (flag_guess_branch_prob)
2671 estimate_probability (&loops);
2673 flow_loops_free (&loops);
2674 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2675 timevar_pop (TV_BRANCH_PROB);
2678 /* Do control and data flow analysis; write some of the results to the
2681 rest_of_handle_cfg (tree decl, rtx insns)
2683 open_dump_file (DFI_cfg, decl);
2685 dump_flow_info (rtl_dump_file);
2687 cleanup_cfg (CLEANUP_EXPENSIVE
2688 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2690 /* It may make more sense to mark constant functions after dead code is
2691 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2692 may insert code making function non-constant, but we still must consider
2693 it as constant, otherwise -fbranch-probabilities will not read data back.
2695 life_analysis rarely eliminates modification of external memory.
2698 mark_constant_function ();
2700 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2703 /* Purge addressofs. */
2705 rest_of_handle_addresof (tree decl, rtx insns)
2707 open_dump_file (DFI_addressof, decl);
2709 purge_addressof (insns);
2711 purge_all_dead_edges (0);
2712 reg_scan (insns, max_reg_num (), 1);
2714 close_dump_file (DFI_addressof, print_rtl, insns);
2717 /* We may have potential sibling or tail recursion sites. Select one
2718 (of possibly multiple) methods of performing the call. */
2720 rest_of_handle_sibling_calls (rtx insns)
2723 optimize_sibling_and_tail_recursive_calls ();
2725 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2726 free_bb_for_insn ();
2727 find_exception_handler_labels ();
2728 rebuild_jump_labels (insns);
2729 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2731 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2732 notes before simplifying cfg and we must do lowering after sibcall
2733 that unhides parts of RTL chain and cleans up the CFG.
2735 Until sibcall is replaced by tree-level optimizer, lets just
2736 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2737 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2738 if (GET_CODE (insn) == NOTE
2739 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2742 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2745 /* Perform jump bypassing and control flow optimizations. */
2747 rest_of_handle_jump_bypass (tree decl, rtx insns)
2749 timevar_push (TV_BYPASS);
2750 open_dump_file (DFI_bypass, decl);
2752 cleanup_cfg (CLEANUP_EXPENSIVE);
2754 if (bypass_jumps (rtl_dump_file))
2756 rebuild_jump_labels (insns);
2757 cleanup_cfg (CLEANUP_EXPENSIVE);
2758 delete_trivially_dead_insns (insns, max_reg_num ());
2761 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2762 timevar_pop (TV_BYPASS);
2766 #ifdef ENABLE_CHECKING
2767 verify_flow_info ();
2771 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2772 if we must exit rest_of_compilation upon return. */
2774 rest_of_handle_inlining (tree decl)
2781 /* If we are reconsidering an inline function at the end of
2782 compilation, skip the stuff for making it inline. */
2783 if (DECL_SAVED_INSNS (decl) != 0)
2786 /* If this is nested inside an inlined external function, pretend
2787 it was only declared. Since we cannot inline such functions,
2788 generating code for this one is not only not necessary but will
2789 confuse some debugging output writers. */
2790 for (parent = DECL_CONTEXT (current_function_decl);
2791 parent != NULL_TREE;
2792 parent = get_containing_scope (parent))
2793 if (TREE_CODE (parent) == FUNCTION_DECL
2794 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2796 DECL_INITIAL (decl) = 0;
2799 else if (TYPE_P (parent))
2800 /* A function in a local class should be treated normally. */
2803 /* If requested, consider whether to make this function inline. */
2804 if ((DECL_INLINE (decl) && !flag_no_inline)
2805 || flag_inline_functions)
2807 timevar_push (TV_INTEGRATION);
2808 lose = function_cannot_inline_p (decl);
2809 timevar_pop (TV_INTEGRATION);
2810 if (lose || ! optimize)
2812 if (warn_inline && DECL_INLINE (decl))
2813 warning_with_decl (decl, lose);
2814 DECL_ABSTRACT_ORIGIN (decl) = 0;
2815 /* Don't really compile an extern inline function.
2816 If we can't make it inline, pretend
2817 it was only declared. */
2818 if (DECL_EXTERNAL (decl))
2820 DECL_INITIAL (decl) = 0;
2825 /* ??? Note that we used to just make it look like if
2826 the "inline" keyword was specified when we decide
2827 to inline it (because of -finline-functions).
2828 garloff@suse.de, 2002-04-24: Add another flag to
2829 actually record this piece of information. */
2830 if (!DECL_INLINE (decl))
2831 DID_INLINE_FUNC (decl) = 1;
2832 inlinable = DECL_INLINE (decl) = 1;
2836 insns = get_insns ();
2838 /* Dump the rtl code if we are dumping rtl. */
2840 if (open_dump_file (DFI_rtl, decl))
2842 if (DECL_SAVED_INSNS (decl))
2843 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2844 close_dump_file (DFI_rtl, print_rtl, insns);
2847 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2848 sorts of eh initialization. Delay this until after the
2849 initial rtl dump so that we can see the original nesting. */
2850 convert_from_eh_region_ranges ();
2852 /* If function is inline, and we don't yet know whether to
2853 compile it by itself, defer decision till end of compilation.
2854 wrapup_global_declarations will (indirectly) call
2855 rest_of_compilation again for those functions that need to
2856 be output. Also defer those functions that we are supposed
2860 || (DECL_INLINE (decl)
2861 && flag_inline_functions
2862 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2863 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2864 && ! flag_keep_inline_functions)
2865 || DECL_EXTERNAL (decl))))
2866 DECL_DEFER_OUTPUT (decl) = 1;
2868 if (DECL_INLINE (decl))
2869 /* DWARF wants separate debugging info for abstract and
2870 concrete instances of all inline functions, including those
2871 declared inline but not inlined, and those inlined even
2872 though they weren't declared inline. Conveniently, that's
2873 what DECL_INLINE means at this point. */
2874 (*debug_hooks->deferred_inline_function) (decl);
2876 if (DECL_DEFER_OUTPUT (decl))
2878 /* If -Wreturn-type, we have to do a bit of compilation. We just
2879 want to call cleanup the cfg to figure out whether or not we can
2880 fall off the end of the function; we do the minimum amount of
2881 work necessary to make that safe. */
2882 if (warn_return_type)
2884 int saved_optimize = optimize;
2887 rebuild_jump_labels (insns);
2888 find_exception_handler_labels ();
2889 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2890 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2891 optimize = saved_optimize;
2893 /* CFG is no longer maintained up-to-date. */
2894 free_bb_for_insn ();
2897 set_nothrow_function_flags ();
2898 if (current_function_nothrow)
2899 /* Now we know that this can't throw; set the flag for the benefit
2900 of other functions later in this translation unit. */
2901 TREE_NOTHROW (current_function_decl) = 1;
2903 timevar_push (TV_INTEGRATION);
2904 save_for_inline (decl);
2905 timevar_pop (TV_INTEGRATION);
2906 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2910 /* If specified extern inline but we aren't inlining it, we are
2911 done. This goes for anything that gets here with DECL_EXTERNAL
2912 set, not just things with DECL_INLINE. */
2913 return (bool) DECL_EXTERNAL (decl);
2916 /* Rest of compilation helper to convert the rtl to SSA form. */
2918 rest_of_handle_ssa (tree decl, rtx insns)
2920 timevar_push (TV_TO_SSA);
2921 open_dump_file (DFI_ssa, decl);
2923 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2926 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2927 timevar_pop (TV_TO_SSA);
2929 /* Perform sparse conditional constant propagation, if requested. */
2932 timevar_push (TV_SSA_CCP);
2933 open_dump_file (DFI_ssa_ccp, decl);
2937 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2938 timevar_pop (TV_SSA_CCP);
2941 /* It would be useful to cleanup the CFG at this point, but block
2942 merging and possibly other transformations might leave a PHI
2943 node in the middle of a basic block, which is a strict no-no. */
2945 /* The SSA implementation uses basic block numbers in its phi
2946 nodes. Thus, changing the control-flow graph or the basic
2947 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2948 may cause problems. */
2952 /* Remove dead code. */
2954 timevar_push (TV_SSA_DCE);
2955 open_dump_file (DFI_ssa_dce, decl);
2957 insns = get_insns ();
2958 ssa_eliminate_dead_code ();
2960 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2961 timevar_pop (TV_SSA_DCE);
2964 /* Convert from SSA form. */
2966 timevar_push (TV_FROM_SSA);
2967 open_dump_file (DFI_ussa, decl);
2969 convert_from_ssa ();
2970 /* New registers have been created. Rescan their usage. */
2971 reg_scan (insns, max_reg_num (), 1);
2973 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2974 timevar_pop (TV_FROM_SSA);
2981 /* Try to identify useless null pointer tests and delete them. */
2983 rest_of_handle_null_pointer (tree decl, rtx insns)
2985 open_dump_file (DFI_null, decl);
2987 dump_flow_info (rtl_dump_file);
2989 if (delete_null_pointer_checks (insns))
2990 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2992 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2995 /* Try combining insns through substitution. */
2997 rest_of_handle_combine (tree decl, rtx insns)
2999 int rebuild_jump_labels_after_combine = 0;
3001 timevar_push (TV_COMBINE);
3002 open_dump_file (DFI_combine, decl);
3004 rebuild_jump_labels_after_combine
3005 = combine_instructions (insns, max_reg_num ());
3007 /* Combining insns may have turned an indirect jump into a
3008 direct jump. Rebuild the JUMP_LABEL fields of jumping
3010 if (rebuild_jump_labels_after_combine)
3012 timevar_push (TV_JUMP);
3013 rebuild_jump_labels (insns);
3014 timevar_pop (TV_JUMP);
3016 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3019 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3020 timevar_pop (TV_COMBINE);
3025 /* Perform life analysis. */
3027 rest_of_handle_life (tree decl, rtx insns)
3029 open_dump_file (DFI_life, decl);
3032 #ifdef ENABLE_CHECKING
3033 verify_flow_info ();
3035 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3037 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3038 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3039 timevar_pop (TV_FLOW);
3041 if (warn_uninitialized)
3043 uninitialized_vars_warning (DECL_INITIAL (decl));
3045 setjmp_args_warning ();
3050 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3052 /* Insns were inserted, and possibly pseudos created, so
3053 things might look a bit different. */
3054 insns = get_insns ();
3055 allocate_reg_life_data ();
3056 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3057 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3063 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3068 /* Perform common subexpression elimination. Nonzero value from
3069 `cse_main' means that jumps were simplified and some code may now
3070 be unreachable, so do jump optimization again. */
3072 rest_of_handle_cse (tree decl, rtx insns)
3076 open_dump_file (DFI_cse, decl);
3078 dump_flow_info (rtl_dump_file);
3079 timevar_push (TV_CSE);
3081 reg_scan (insns, max_reg_num (), 1);
3083 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3085 rebuild_jump_labels (insns);
3086 purge_all_dead_edges (0);
3088 delete_trivially_dead_insns (insns, max_reg_num ());
3090 /* If we are not running more CSE passes, then we are no longer
3091 expecting CSE to be run. But always rerun it in a cheap mode. */
3092 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
3094 if (tem || optimize > 1)
3095 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3096 /* Try to identify useless null pointer tests and delete them. */
3097 if (flag_delete_null_pointer_checks)
3099 timevar_push (TV_JUMP);
3101 if (delete_null_pointer_checks (insns))
3102 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3103 timevar_pop (TV_JUMP);
3106 /* The second pass of jump optimization is likely to have
3107 removed a bunch more instructions. */
3108 renumber_insns (rtl_dump_file);
3110 timevar_pop (TV_CSE);
3111 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
3114 /* Run second CSE pass after loop optimizations. */
3116 rest_of_handle_cse2 (tree decl, rtx insns)
3120 timevar_push (TV_CSE2);
3121 open_dump_file (DFI_cse2, decl);
3123 dump_flow_info (rtl_dump_file);
3124 /* CFG is no longer maintained up-to-date. */
3125 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3126 purge_all_dead_edges (0);
3127 delete_trivially_dead_insns (insns, max_reg_num ());
3131 timevar_push (TV_JUMP);
3132 rebuild_jump_labels (insns);
3133 cleanup_cfg (CLEANUP_EXPENSIVE);
3134 timevar_pop (TV_JUMP);
3136 reg_scan (insns, max_reg_num (), 0);
3137 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3139 timevar_pop (TV_CSE2);
3142 /* Perform global cse. */
3144 rest_of_handle_gcse (tree decl, rtx insns)
3146 int save_csb, save_cfj;
3149 timevar_push (TV_GCSE);
3150 open_dump_file (DFI_gcse, decl);
3152 tem = gcse_main (insns, rtl_dump_file);
3153 rebuild_jump_labels (insns);
3154 delete_trivially_dead_insns (insns, max_reg_num ());
3156 save_csb = flag_cse_skip_blocks;
3157 save_cfj = flag_cse_follow_jumps;
3158 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
3160 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
3161 if (current_function_calls_constant_p)
3162 purge_builtin_constant_p ();
3164 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3166 if (flag_expensive_optimizations)
3168 timevar_push (TV_CSE);
3169 reg_scan (insns, max_reg_num (), 1);
3170 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3171 purge_all_dead_edges (0);
3172 delete_trivially_dead_insns (insns, max_reg_num ());
3173 timevar_pop (TV_CSE);
3174 cse_not_expected = !flag_rerun_cse_after_loop;
3177 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3178 things up. Then possibly re-run CSE again. */
3182 timevar_push (TV_JUMP);
3183 rebuild_jump_labels (insns);
3184 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3185 timevar_pop (TV_JUMP);
3187 if (flag_expensive_optimizations)
3189 timevar_push (TV_CSE);
3190 reg_scan (insns, max_reg_num (), 1);
3191 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3192 purge_all_dead_edges (0);
3193 delete_trivially_dead_insns (insns, max_reg_num ());
3194 timevar_pop (TV_CSE);
3198 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
3199 timevar_pop (TV_GCSE);
3202 flag_cse_skip_blocks = save_csb;
3203 flag_cse_follow_jumps = save_cfj;
3204 #ifdef ENABLE_CHECKING
3205 verify_flow_info ();
3209 /* Move constant computations out of loops. */
3211 rest_of_handle_loop_optimize (tree decl, rtx insns)
3213 int do_unroll, do_prefetch;
3215 timevar_push (TV_LOOP);
3216 delete_dead_jumptables ();
3217 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3218 open_dump_file (DFI_loop, decl);
3220 /* CFG is no longer maintained up-to-date. */
3221 free_bb_for_insn ();
3223 if (flag_unroll_loops)
3224 do_unroll = 0; /* Having two unrollers is useless. */
3226 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3227 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3229 if (flag_rerun_loop_opt)
3231 cleanup_barriers ();
3233 /* We only want to perform unrolling once. */
3234 loop_optimize (insns, rtl_dump_file, do_unroll);
3237 /* The first call to loop_optimize makes some instructions
3238 trivially dead. We delete those instructions now in the
3239 hope that doing so will make the heuristics in loop work
3240 better and possibly speed up compilation. */
3241 delete_trivially_dead_insns (insns, max_reg_num ());
3243 /* The regscan pass is currently necessary as the alias
3244 analysis code depends on this information. */
3245 reg_scan (insns, max_reg_num (), 1);
3247 cleanup_barriers ();
3248 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3250 /* Loop can create trivially dead instructions. */
3251 delete_trivially_dead_insns (insns, max_reg_num ());
3252 close_dump_file (DFI_loop, print_rtl, insns);
3253 timevar_pop (TV_LOOP);
3254 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3259 /* Perform loop optimizations. It might be better to do them a bit
3260 sooner, but we want the profile feedback to work more
3263 rest_of_handle_loop2 (tree decl, rtx insns)
3265 struct loops *loops;
3266 timevar_push (TV_LOOP);
3267 open_dump_file (DFI_loop2, decl);
3269 dump_flow_info (rtl_dump_file);
3271 loops = loop_optimizer_init (rtl_dump_file);
3275 /* The optimizations: */
3276 if (flag_unswitch_loops)
3277 unswitch_loops (loops);
3279 if (flag_peel_loops || flag_unroll_loops)
3280 unroll_and_peel_loops (loops,
3281 (flag_peel_loops ? UAP_PEEL : 0) |
3282 (flag_unroll_loops ? UAP_UNROLL : 0) |
3283 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3285 loop_optimizer_finalize (loops, rtl_dump_file);
3288 cleanup_cfg (CLEANUP_EXPENSIVE);
3289 delete_trivially_dead_insns (insns, max_reg_num ());
3290 reg_scan (insns, max_reg_num (), 0);
3292 dump_flow_info (rtl_dump_file);
3293 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3294 timevar_pop (TV_LOOP);
3298 /* This is called from finish_function (within langhooks.parse_file)
3299 after each top-level definition is parsed.
3300 It is supposed to compile that function or variable
3301 and output the assembler code for it.
3302 After we return, the tree storage is freed. */
3305 rest_of_compilation (tree decl)
3308 int rebuild_label_notes_after_reload;
3310 timevar_push (TV_REST_OF_COMPILATION);
3312 /* Register rtl specific functions for cfg. */
3313 rtl_register_cfg_hooks ();
3315 /* Now that we're out of the frontend, we shouldn't have any more
3316 CONCATs anywhere. */
3317 generating_concat_p = 0;
3319 /* When processing delayed functions, prepare_function_start() won't
3320 have been run to re-initialize it. */
3321 cse_not_expected = ! optimize;
3323 /* First, make sure that NOTE_BLOCK is set correctly for each
3324 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3325 if (!cfun->x_whole_function_mode_p)
3328 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3329 tree in sensible shape. So, we just recalculate it here. */
3330 if (cfun->x_whole_function_mode_p)
3335 if (rest_of_handle_inlining (decl))
3336 goto exit_rest_of_compilation;
3338 /* If we're emitting a nested function, make sure its parent gets
3339 emitted as well. Doing otherwise confuses debug info. */
3342 for (parent = DECL_CONTEXT (current_function_decl);
3343 parent != NULL_TREE;
3344 parent = get_containing_scope (parent))
3345 if (TREE_CODE (parent) == FUNCTION_DECL)
3346 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3349 /* We are now committed to emitting code for this function. Do any
3350 preparation, such as emitting abstract debug info for the inline
3351 before it gets mangled by optimization. */
3352 if (DECL_INLINE (decl))
3353 (*debug_hooks->outlining_inline_function) (decl);
3355 /* Remove any notes we don't need. That will make iterating
3356 over the instruction sequence faster, and allow the garbage
3357 collector to reclaim the memory used by the notes. */
3358 remove_unnecessary_notes ();
3363 /* Initialize some variables used by the optimizers. */
3364 init_function_for_compilation ();
3366 if (! DECL_DEFER_OUTPUT (decl))
3367 TREE_ASM_WRITTEN (decl) = 1;
3369 /* Now that integrate will no longer see our rtl, we need not
3370 distinguish between the return value of this function and the
3371 return value of called functions. Also, we can remove all SETs
3372 of subregs of hard registers; they are only here because of
3373 integrate. Also, we can now initialize pseudos intended to
3374 carry magic hard reg data throughout the function. */
3375 rtx_equal_function_value_matters = 0;
3376 purge_hard_subreg_sets (get_insns ());
3378 /* Early return if there were errors. We can run afoul of our
3379 consistency checks, and there's not really much point in fixing them.
3380 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3381 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3382 || errorcount || sorrycount)
3383 goto exit_rest_of_compilation;
3385 timevar_push (TV_JUMP);
3386 open_dump_file (DFI_sibling, decl);
3387 insns = get_insns ();
3388 rebuild_jump_labels (insns);
3389 find_exception_handler_labels ();
3390 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3392 delete_unreachable_blocks ();
3394 /* We have to issue these warnings now already, because CFG cleanups
3395 further down may destroy the required information. */
3396 check_function_return_warnings ();
3398 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3399 if (flag_guess_branch_prob)
3401 timevar_push (TV_BRANCH_PROB);
3402 note_prediction_to_br_prob ();
3403 timevar_pop (TV_BRANCH_PROB);
3406 if (flag_optimize_sibling_calls)
3407 rest_of_handle_sibling_calls (insns);
3409 timevar_pop (TV_JUMP);
3411 insn_locators_initialize ();
3412 /* Complete generation of exception handling code. */
3415 timevar_push (TV_JUMP);
3416 open_dump_file (DFI_eh, decl);
3418 finish_eh_generation ();
3420 close_dump_file (DFI_eh, print_rtl, get_insns ());
3421 timevar_pop (TV_JUMP);
3424 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3425 generation, which might create new sets. */
3426 emit_initial_value_sets ();
3429 /* If we are doing position-independent code generation, now
3430 is the time to output special prologues and epilogues.
3431 We do not want to do this earlier, because it just clutters
3432 up inline functions with meaningless insns. */
3437 insns = get_insns ();
3439 /* Copy any shared structure that should not be shared. */
3440 unshare_all_rtl (current_function_decl, insns);
3442 #ifdef SETJMP_VIA_SAVE_AREA
3443 /* This must be performed before virtual register instantiation.
3444 Please be aware the everything in the compiler that can look
3445 at the RTL up to this point must understand that REG_SAVE_AREA
3446 is just like a use of the REG contained inside. */
3447 if (current_function_calls_alloca)
3448 optimize_save_area_alloca (insns);
3451 /* Instantiate all virtual registers. */
3452 instantiate_virtual_regs (current_function_decl, insns);
3454 open_dump_file (DFI_jump, decl);
3456 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3457 are initialized and to compute whether control can drop off the end
3460 timevar_push (TV_JUMP);
3461 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3462 before jump optimization switches branch directions. */
3463 if (flag_guess_branch_prob)
3464 expected_value_to_br_prob ();
3466 reg_scan (insns, max_reg_num (), 0);
3467 rebuild_jump_labels (insns);
3468 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3469 delete_trivially_dead_insns (insns, max_reg_num ());
3471 dump_flow_info (rtl_dump_file);
3472 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3473 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3477 free_bb_for_insn ();
3478 copy_loop_headers (insns);
3479 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3481 purge_line_number_notes (insns);
3483 timevar_pop (TV_JUMP);
3484 close_dump_file (DFI_jump, print_rtl, insns);
3486 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3487 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3488 goto exit_rest_of_compilation;
3490 /* Long term, this should probably move before the jump optimizer too,
3491 but I didn't want to disturb the rtl_dump_and_exit and related
3492 stuff at this time. */
3493 if (optimize > 0 && flag_ssa)
3494 insns = rest_of_handle_ssa (decl, insns);
3496 timevar_push (TV_JUMP);
3499 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3501 if (flag_delete_null_pointer_checks)
3502 rest_of_handle_null_pointer (decl, insns);
3504 /* Jump optimization, and the removal of NULL pointer checks, may
3505 have reduced the number of instructions substantially. CSE, and
3506 future passes, allocate arrays whose dimensions involve the
3507 maximum instruction UID, so if we can reduce the maximum UID
3508 we'll save big on memory. */
3509 renumber_insns (rtl_dump_file);
3510 timevar_pop (TV_JUMP);
3512 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3517 rest_of_handle_cse (decl, insns);
3519 rest_of_handle_addresof (decl, insns);
3526 rest_of_handle_gcse (decl, insns);
3528 if (flag_loop_optimize)
3529 rest_of_handle_loop_optimize (decl, insns);
3532 rest_of_handle_jump_bypass (decl, insns);
3535 timevar_push (TV_FLOW);
3537 rest_of_handle_cfg (decl, insns);
3540 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3541 rest_of_handle_branch_prob (decl, insns);
3544 rest_of_handle_if_conversion (decl, insns);
3547 rest_of_handle_tracer (decl, insns);
3550 && (flag_unswitch_loops
3552 || flag_unroll_loops))
3553 rest_of_handle_loop2 (decl, insns);
3555 if (flag_rerun_cse_after_loop)
3556 rest_of_handle_cse2 (decl, insns);
3558 cse_not_expected = 1;
3560 rest_of_handle_life (decl, insns);
3563 rest_of_handle_combine (decl, insns);
3565 if (flag_if_conversion)
3566 rest_of_handle_if_after_combine (decl, insns);
3568 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3569 rest_of_handle_regmove (decl, insns);
3571 /* Do unconditional splitting before register allocation to allow machine
3572 description to add extra information not needed previously. */
3573 split_all_insns (1);
3575 #ifdef OPTIMIZE_MODE_SWITCHING
3576 timevar_push (TV_MODE_SWITCH);
3579 optimize_mode_switching (NULL);
3582 timevar_pop (TV_MODE_SWITCH);
3585 /* Any of the several passes since flow1 will have munged register
3586 lifetime data a bit. We need it to be up to date for scheduling
3587 (see handling of reg_known_equiv in init_alias_analysis). */
3588 recompute_reg_usage (insns, !optimize_size);
3590 #ifdef INSN_SCHEDULING
3591 rest_of_handle_sched (decl, insns);
3594 /* Determine if the current function is a leaf before running reload
3595 since this can impact optimizations done by the prologue and
3596 epilogue thus changing register elimination offsets. */
3597 current_function_is_leaf = leaf_function_p ();
3599 timevar_push (TV_LOCAL_ALLOC);
3600 open_dump_file (DFI_lreg, decl);
3602 if (flag_new_regalloc)
3604 if (rest_of_handle_new_regalloc (decl, insns,
3605 &rebuild_label_notes_after_reload))
3606 goto exit_rest_of_compilation;
3610 if (rest_of_handle_old_regalloc (decl, insns,
3611 &rebuild_label_notes_after_reload))
3612 goto exit_rest_of_compilation;
3617 open_dump_file (DFI_postreload, decl);
3619 /* Do a very simple CSE pass over just the hard registers. */
3622 timevar_push (TV_RELOAD_CSE_REGS);
3623 reload_cse_regs (insns);
3624 timevar_pop (TV_RELOAD_CSE_REGS);
3627 /* Register allocation and reloading may have turned an indirect jump into
3628 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3629 jumping instructions. */
3630 if (rebuild_label_notes_after_reload)
3632 timevar_push (TV_JUMP);
3634 rebuild_jump_labels (insns);
3635 purge_all_dead_edges (0);
3637 timevar_pop (TV_JUMP);
3640 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3642 /* Re-create the death notes which were deleted during reload. */
3643 timevar_push (TV_FLOW2);
3644 open_dump_file (DFI_flow2, decl);
3646 #ifdef ENABLE_CHECKING
3647 verify_flow_info ();
3650 /* If optimizing, then go ahead and split insns now. */
3654 split_all_insns (0);
3656 if (flag_branch_target_load_optimize)
3658 open_dump_file (DFI_branch_target_load, decl);
3660 branch_target_load_optimize (insns, false);
3662 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3668 cleanup_cfg (CLEANUP_EXPENSIVE);
3670 /* On some machines, the prologue and epilogue code, or parts thereof,
3671 can be represented as RTL. Doing so lets us schedule insns between
3672 it and the rest of the code and also allows delayed branch
3673 scheduling to operate in the epilogue. */
3674 thread_prologue_and_epilogue_insns (insns);
3675 epilogue_completed = 1;
3679 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3680 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3681 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3683 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3684 even for machines with possibly nonzero RETURN_POPS_ARGS
3685 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3686 push instructions will have popping returns. */
3687 #ifndef PUSH_ROUNDING
3688 if (!ACCUMULATE_OUTGOING_ARGS)
3690 combine_stack_adjustments ();
3695 flow2_completed = 1;
3697 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3698 timevar_pop (TV_FLOW2);
3700 #ifdef HAVE_peephole2
3701 if (optimize > 0 && flag_peephole2)
3703 timevar_push (TV_PEEPHOLE2);
3704 open_dump_file (DFI_peephole2, decl);
3706 peephole2_optimize (rtl_dump_file);
3708 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3709 timevar_pop (TV_PEEPHOLE2);
3715 if (flag_rename_registers || flag_cprop_registers)
3716 rest_of_handle_regrename (decl, insns);
3718 rest_of_handle_reorder_blocks (decl, insns);
3721 if (flag_if_conversion2)
3723 timevar_push (TV_IFCVT2);
3724 open_dump_file (DFI_ce3, decl);
3728 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3729 timevar_pop (TV_IFCVT2);
3732 if (flag_branch_target_load_optimize2)
3734 /* Leave this a warning for now so that it is possible to experiment
3735 with running this pass twice. In 3.6, we should either make this
3736 an error, or use separate dump files. */
3737 if (flag_branch_target_load_optimize)
3738 warning ("branch target register load optimization is not intended "
3741 open_dump_file (DFI_branch_target_load, decl);
3743 branch_target_load_optimize (insns, true);
3745 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3750 #ifdef INSN_SCHEDULING
3751 if (optimize > 0 && flag_schedule_insns_after_reload)
3752 rest_of_handle_sched2 (decl, insns);
3755 #ifdef LEAF_REGISTERS
3756 current_function_uses_only_leaf_regs
3757 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3761 rest_of_handle_stack_regs (decl, insns);
3764 compute_alignments ();
3766 /* CFG is no longer maintained up-to-date. */
3767 free_bb_for_insn ();
3769 if (targetm.machine_dependent_reorg != 0)
3770 rest_of_handle_machine_reorg (decl, insns);
3772 purge_line_number_notes (insns);
3773 cleanup_barriers ();
3776 if (optimize > 0 && flag_delayed_branch)
3777 rest_of_handle_delay_slots (decl, insns);
3780 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3781 timevar_push (TV_SHORTEN_BRANCH);
3782 split_all_insns_noflow ();
3783 timevar_pop (TV_SHORTEN_BRANCH);
3786 convert_to_eh_region_ranges ();
3788 /* Shorten branches. */
3789 timevar_push (TV_SHORTEN_BRANCH);
3790 shorten_branches (get_insns ());
3791 timevar_pop (TV_SHORTEN_BRANCH);
3793 set_nothrow_function_flags ();
3794 if (current_function_nothrow)
3795 /* Now we know that this can't throw; set the flag for the benefit
3796 of other functions later in this translation unit. */
3797 TREE_NOTHROW (current_function_decl) = 1;
3799 rest_of_handle_final (decl, insns);
3801 /* Write DBX symbols if requested. */
3803 /* Note that for those inline functions where we don't initially
3804 know for certain that we will be generating an out-of-line copy,
3805 the first invocation of this routine (rest_of_compilation) will
3806 skip over this code by doing a `goto exit_rest_of_compilation;'.
3807 Later on, wrapup_global_declarations will (indirectly) call
3808 rest_of_compilation again for those inline functions that need
3809 to have out-of-line copies generated. During that call, we
3810 *will* be routed past here. */
3812 timevar_push (TV_SYMOUT);
3813 (*debug_hooks->function_decl) (decl);
3814 timevar_pop (TV_SYMOUT);
3816 exit_rest_of_compilation:
3818 coverage_end_function ();
3820 /* In case the function was not output,
3821 don't leave any temporary anonymous types
3822 queued up for sdb output. */
3823 #ifdef SDB_DEBUGGING_INFO
3824 if (write_symbols == SDB_DEBUG)
3825 sdbout_types (NULL_TREE);
3828 reload_completed = 0;
3829 epilogue_completed = 0;
3830 flow2_completed = 0;
3833 timevar_push (TV_FINAL);
3835 /* Clear out the insn_length contents now that they are no
3837 init_insn_lengths ();
3839 /* Show no temporary slots allocated. */
3842 free_basic_block_vars (0);
3843 free_bb_for_insn ();
3845 timevar_pop (TV_FINAL);
3847 if ((*targetm.binds_local_p) (current_function_decl))
3849 int pref = cfun->preferred_stack_boundary;
3850 if (cfun->recursive_call_emit
3851 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3852 pref = cfun->stack_alignment_needed;
3853 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3857 /* Make sure volatile mem refs aren't considered valid operands for
3858 arithmetic insns. We must call this here if this is a nested inline
3859 function, since the above code leaves us in the init_recog state
3860 (from final.c), and the function context push/pop code does not
3861 save/restore volatile_ok.
3863 ??? Maybe it isn't necessary for expand_start_function to call this
3864 anymore if we do it here? */
3866 init_recog_no_volatile ();
3868 /* We're done with this function. Free up memory if we can. */
3869 free_after_parsing (cfun);
3870 if (! DECL_DEFER_OUTPUT (decl))
3872 free_after_compilation (cfun);
3874 /* Clear integrate.c's pointer to the cfun structure we just
3876 DECL_SAVED_INSNS (decl) = 0;
3882 timevar_pop (TV_REST_OF_COMPILATION);
3885 /* Display help for generic options. */
3893 for (i = ARRAY_SIZE (f_options); i--;)
3895 const char *description = f_options[i].description;
3897 if (description != NULL && *description != 0)
3898 printf (" -f%-21s %s\n",
3899 f_options[i].string, _(description));
3902 for (i = LAST_PARAM; i--;)
3904 const char *description = compiler_params[i].help;
3905 const int length = 21 - strlen (compiler_params[i].option);
3907 if (description != NULL && *description != 0)
3908 printf (" --param %s=<value>%.*s%s\n",
3909 compiler_params[i].option,
3910 length > 0 ? length : 1, " ",
3914 for (i = ARRAY_SIZE (debug_args); i--;)
3916 if (debug_args[i].description != NULL)
3917 printf (" -g%-21s %s\n",
3918 debug_args[i].arg, _(debug_args[i].description));
3924 /* Display descriptions of language specific options.
3925 If there is no description, note that there is an undocumented option.
3926 If the description is empty, do not display anything. (This allows
3927 options to be deliberately undocumented, for whatever reason).
3928 If the option string is missing, then this is a marker, indicating
3929 that the description string is in fact the name of a language, whose
3930 language specific options are to follow. */
3932 if (ARRAY_SIZE (documented_lang_options) > 1)
3934 printf (_("\nLanguage specific options:\n"));
3936 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3938 const char *description = documented_lang_options[i].description;
3939 const char *option = documented_lang_options[i].option;
3941 if (description == NULL)
3946 printf (_(" %-23.23s [undocumented]\n"), option);
3948 else if (*description == 0)
3950 else if (option == NULL)
3954 (_("\nThere are undocumented %s specific options as well.\n"),
3958 printf (_("\n Options for %s:\n"), description);
3963 printf (" %-23.23s %s\n", option, _(description));
3968 printf (_("\nThere are undocumented %s specific options as well.\n"),
3971 display_target_options ();
3974 /* Display help for target options. */
3976 display_target_options (void)
3979 static bool displayed = false;
3981 /* Avoid double printing for --help --target-help. */
3987 if (ARRAY_SIZE (target_switches) > 1
3988 #ifdef TARGET_OPTIONS
3989 || ARRAY_SIZE (target_options) > 1
3997 printf (_("\nTarget specific options:\n"));
3999 for (i = ARRAY_SIZE (target_switches); i--;)
4001 const char *option = target_switches[i].name;
4002 const char *description = target_switches[i].description;
4004 if (option == NULL || *option == 0)
4006 else if (description == NULL)
4011 printf (_(" -m%-23.23s [undocumented]\n"), option);
4013 else if (*description != 0)
4014 doc += printf (" -m%-23.23s %s\n", option, _(description));
4017 #ifdef TARGET_OPTIONS
4018 for (i = ARRAY_SIZE (target_options); i--;)
4020 const char *option = target_options[i].prefix;
4021 const char *description = target_options[i].description;
4023 if (option == NULL || *option == 0)
4025 else if (description == NULL)
4030 printf (_(" -m%-23.23s [undocumented]\n"), option);
4032 else if (*description != 0)
4033 doc += printf (" -m%-23.23s %s\n", option, _(description));
4039 printf (_("\nThere are undocumented target specific options as well.\n"));
4041 printf (_(" They exist, but they are not documented.\n"));
4046 /* Parse a -d... command line switch. */
4049 decode_d_option (const char *arg)
4057 for (i = 0; i < (int) DFI_MAX; ++i)
4058 dump_file[i].enabled = 1;
4064 flag_print_asm_name = 1;
4067 flag_dump_rtl_in_asm = 1;
4068 flag_print_asm_name = 1;
4071 graph_dump_format = vcg;
4074 rtl_dump_and_exit = 1;
4079 case 'D': /* These are handled by the preprocessor. */
4083 setup_core_dumping();
4088 for (i = 0; i < (int) DFI_MAX; ++i)
4089 if (c == dump_file[i].debug_switch)
4091 dump_file[i].enabled = 1;
4096 warning ("unrecognized gcc debugging option: %c", c);
4101 /* Indexed by enum debug_info_type. */
4102 const char *const debug_type_names[] =
4104 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4107 /* Parse a -g... command line switch. ARG is the value after the -g.
4108 It is safe to access 'ARG - 2' to generate the full switch name.
4109 Return the number of strings consumed. */
4112 decode_g_option (const char *arg)
4114 static unsigned level = 0;
4115 /* A lot of code assumes write_symbols == NO_DEBUG if the
4116 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4117 of what debugging type has been selected). This records the
4118 selected type. It is an error to specify more than one
4120 static enum debug_info_type selected_debug_type = NO_DEBUG;
4121 /* Nonzero if debugging format has been explicitly set.
4122 -g and -ggdb don't explicitly set the debugging format so
4123 -gdwarf -g3 is equivalent to -gdwarf3. */
4124 static int type_explicitly_set_p = 0;
4126 /* The maximum admissible debug level value. */
4127 static const unsigned max_debug_level = 3;
4129 /* Look up ARG in the table. */
4130 for (da = debug_args; da->arg; da++)
4132 const int da_len = strlen (da->arg);
4134 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4136 enum debug_info_type type = da->debug_type;
4137 const char *p = arg + da_len;
4139 if (*p && ! ISDIGIT (*p))
4142 /* A debug flag without a level defaults to level 2.
4143 Note we do not want to call read_integral_parameter
4144 for that case since it will call atoi which
4147 ??? We may want to generalize the interface to
4148 read_integral_parameter to better handle this case
4149 if this case shows up often. */
4151 level = read_integral_parameter (p, 0, max_debug_level + 1);
4153 level = (level == 0) ? 2 : level;
4155 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4157 error ("use -gdwarf -g%d for DWARF v1, level %d",
4160 error ("use -gdwarf-2 for DWARF v2");
4163 if (level > max_debug_level)
4166 ignoring option `%s' due to invalid debug level specification",
4168 level = debug_info_level;
4171 if (type == NO_DEBUG)
4173 type = PREFERRED_DEBUGGING_TYPE;
4175 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4177 #ifdef DWARF2_DEBUGGING_INFO
4178 type = DWARF2_DEBUG;
4180 #ifdef DBX_DEBUGGING_INFO
4187 if (type == NO_DEBUG)
4188 warning ("`%s': unknown or unsupported -g option", arg - 2);
4190 /* Does it conflict with an already selected type? */
4191 if (type_explicitly_set_p
4192 /* -g/-ggdb don't conflict with anything. */
4193 && da->debug_type != NO_DEBUG
4194 && type != selected_debug_type)
4195 warning ("`%s' ignored, conflicts with `-g%s'",
4196 arg - 2, debug_type_names[(int) selected_debug_type]);
4199 /* If the format has already been set, -g/-ggdb
4200 only change the debug level. */
4201 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4202 /* Don't change debugging type. */
4206 selected_debug_type = type;
4207 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4210 write_symbols = (level == 0
4212 : selected_debug_type);
4213 use_gnu_debug_info_extensions = da->use_extensions_p;
4214 debug_info_level = (enum debug_info_level) level;
4222 warning ("`-g%s': unknown or unsupported -g option", arg);
4225 /* Decode -m switches. */
4226 /* Decode the switch -mNAME. */
4229 set_target_switch (const char *name)
4232 int valid_target_option = 0;
4234 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4235 if (!strcmp (target_switches[j].name, name))
4237 if (target_switches[j].value < 0)
4238 target_flags &= ~-target_switches[j].value;
4240 target_flags |= target_switches[j].value;
4243 if (target_switches[j].value < 0)
4244 target_flags_explicit |= -target_switches[j].value;
4246 target_flags_explicit |= target_switches[j].value;
4248 valid_target_option = 1;
4251 #ifdef TARGET_OPTIONS
4252 if (!valid_target_option)
4253 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4255 int len = strlen (target_options[j].prefix);
4256 if (target_options[j].value)
4258 if (!strcmp (target_options[j].prefix, name))
4260 *target_options[j].variable = target_options[j].value;
4261 valid_target_option = 1;
4266 if (!strncmp (target_options[j].prefix, name, len))
4268 *target_options[j].variable = name + len;
4269 valid_target_option = 1;
4275 if (!valid_target_option)
4276 error ("invalid option `%s'", name);
4279 /* Print version information to FILE.
4280 Each line begins with INDENT (for the case where FILE is the
4281 assembler output file). */
4284 print_version (FILE *file, const char *indent)
4287 #define __VERSION__ "[?]"
4291 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4293 "%s%s%s version %s (%s) compiled by CC.\n"
4295 , indent, *indent != 0 ? " " : "",
4296 lang_hooks.name, version_string, TARGET_NAME,
4297 indent, __VERSION__);
4298 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4299 indent, *indent != 0 ? " " : "",
4300 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4303 /* Print an option value and return the adjusted position in the line.
4304 ??? We don't handle error returns from fprintf (disk full); presumably
4305 other code will catch a disk full though. */
4308 print_single_switch (FILE *file, int pos, int max,
4309 const char *indent, const char *sep, const char *term,
4310 const char *type, const char *name)
4312 /* The ultrix fprintf returns 0 on success, so compute the result we want
4313 here since we need it for the following test. */
4314 int len = strlen (sep) + strlen (type) + strlen (name);
4319 fprintf (file, "%s", term);
4324 fprintf (file, "%s", indent);
4325 pos = strlen (indent);
4327 fprintf (file, "%s%s%s", sep, type, name);
4332 /* Print active target switches to FILE.
4333 POS is the current cursor position and MAX is the size of a "line".
4334 Each line begins with INDENT and ends with TERM.
4335 Each switch is separated from the next by SEP. */
4338 print_switch_values (FILE *file, int pos, int max,
4339 const char *indent, const char *sep, const char *term)
4344 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4345 that it can be printed below. This helps reproducibility. */
4348 /* Print the options as passed. */
4349 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4350 _("options passed: "), "");
4352 for (p = &save_argv[1]; *p != NULL; p++)
4356 if (strcmp (*p, "-o") == 0)
4362 if (strcmp (*p, "-quiet") == 0)
4364 if (strcmp (*p, "-version") == 0)
4369 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4372 fprintf (file, "%s", term);
4374 /* Print the -f and -m options that have been enabled.
4375 We don't handle language specific options but printing argv
4378 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4379 _("options enabled: "), "");
4381 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4382 if (*f_options[j].variable == f_options[j].on_value)
4383 pos = print_single_switch (file, pos, max, indent, sep, term,
4384 "-f", f_options[j].string);
4386 /* Print target specific options. */
4388 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4389 if (target_switches[j].name[0] != '\0'
4390 && target_switches[j].value > 0
4391 && ((target_switches[j].value & target_flags)
4392 == target_switches[j].value))
4394 pos = print_single_switch (file, pos, max, indent, sep, term,
4395 "-m", target_switches[j].name);
4398 #ifdef TARGET_OPTIONS
4399 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4400 if (*target_options[j].variable != NULL)
4403 sprintf (prefix, "-m%s", target_options[j].prefix);
4404 pos = print_single_switch (file, pos, max, indent, sep, term,
4405 prefix, *target_options[j].variable);
4409 fprintf (file, "%s", term);
4412 /* Open assembly code output file. Do this even if -fsyntax-only is
4413 on, because then the driver will have provided the name of a
4414 temporary file or bit bucket for us. NAME is the file specified on
4415 the command line, possibly NULL. */
4417 init_asm_output (const char *name)
4419 if (name == NULL && asm_file_name == 0)
4420 asm_out_file = stdout;
4423 if (asm_file_name == 0)
4425 int len = strlen (dump_base_name);
4426 char *dumpname = (char *) xmalloc (len + 6);
4427 memcpy (dumpname, dump_base_name, len + 1);
4428 strip_off_ending (dumpname, len);
4429 strcat (dumpname, ".s");
4430 asm_file_name = dumpname;
4432 if (!strcmp (asm_file_name, "-"))
4433 asm_out_file = stdout;
4435 asm_out_file = fopen (asm_file_name, "w+");
4436 if (asm_out_file == 0)
4437 fatal_error ("can't open %s for writing: %m", asm_file_name);
4440 #ifdef IO_BUFFER_SIZE
4441 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4442 _IOFBF, IO_BUFFER_SIZE);
4445 if (!flag_syntax_only)
4447 targetm.asm_out.file_start ();
4449 #ifdef ASM_COMMENT_START
4450 if (flag_verbose_asm)
4452 /* Print the list of options in effect. */
4453 print_version (asm_out_file, ASM_COMMENT_START);
4454 print_switch_values (asm_out_file, 0, MAX_LINE,
4455 ASM_COMMENT_START, " ", "\n");
4456 /* Add a blank line here so it appears in assembler output but not
4458 fprintf (asm_out_file, "\n");
4464 /* Initialization of the front end environment, before command line
4465 options are parsed. Signal handlers, internationalization etc.
4466 ARGV0 is main's argv[0]. */
4468 general_init (const char *argv0)
4472 p = argv0 + strlen (argv0);
4473 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4477 xmalloc_set_program_name (progname);
4481 gcc_init_libintl ();
4483 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4485 signal (SIGSEGV, crash_signal);
4488 signal (SIGILL, crash_signal);
4491 signal (SIGBUS, crash_signal);
4494 signal (SIGABRT, crash_signal);
4496 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4497 signal (SIGIOT, crash_signal);
4500 signal (SIGFPE, crash_signal);
4503 /* Other host-specific signal setup. */
4504 (*host_hooks.extra_signals)();
4506 /* Initialize the diagnostics reporting machinery, so option parsing
4507 can give warnings and errors. */
4508 diagnostic_initialize (global_dc);
4510 /* Initialize the garbage-collector, string pools and tree type hash
4516 /* Initialize register usage now so switches may override. */
4519 /* Register the language-independent parameters. */
4520 add_params (lang_independent_params, LAST_PARAM);
4522 /* This must be done after add_params but before argument processing. */
4523 init_ggc_heuristics();
4526 /* Process the options that have been parsed. */
4528 process_options (void)
4530 /* Allow the front end to perform consistency checks and do further
4531 initialization based on the command line options. This hook also
4532 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4533 so we can correctly initialize debug output. */
4534 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4535 input_filename = main_input_filename;
4537 #ifdef OVERRIDE_OPTIONS
4538 /* Some machines may reject certain combinations of options. */
4542 /* Set aux_base_name if not already set. */
4545 else if (main_input_filename)
4547 char *name = xstrdup (lbasename (main_input_filename));
4549 strip_off_ending (name, strlen (name));
4550 aux_base_name = name;
4553 aux_base_name = "gccaux";
4555 /* Set up the align_*_log variables, defaulting them to 1 if they
4556 were still unset. */
4557 if (align_loops <= 0) align_loops = 1;
4558 if (align_loops_max_skip > align_loops || !align_loops)
4559 align_loops_max_skip = align_loops - 1;
4560 align_loops_log = floor_log2 (align_loops * 2 - 1);
4561 if (align_jumps <= 0) align_jumps = 1;
4562 if (align_jumps_max_skip > align_jumps || !align_jumps)
4563 align_jumps_max_skip = align_jumps - 1;
4564 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4565 if (align_labels <= 0) align_labels = 1;
4566 align_labels_log = floor_log2 (align_labels * 2 - 1);
4567 if (align_labels_max_skip > align_labels || !align_labels)
4568 align_labels_max_skip = align_labels - 1;
4569 if (align_functions <= 0) align_functions = 1;
4570 align_functions_log = floor_log2 (align_functions * 2 - 1);
4572 /* Unrolling all loops implies that standard loop unrolling must also
4574 if (flag_unroll_all_loops)
4575 flag_unroll_loops = 1;
4577 if (flag_unroll_loops)
4579 flag_old_unroll_loops = 0;
4580 flag_old_unroll_all_loops = 0;
4583 if (flag_old_unroll_all_loops)
4584 flag_old_unroll_loops = 1;
4586 /* Old loop unrolling requires that strength_reduction be on also. Silently
4587 turn on strength reduction here if it isn't already on. Also, the loop
4588 unrolling code assumes that cse will be run after loop, so that must
4589 be turned on also. */
4590 if (flag_old_unroll_loops)
4592 flag_strength_reduce = 1;
4593 flag_rerun_cse_after_loop = 1;
4595 if (flag_unroll_loops || flag_peel_loops)
4596 flag_rerun_cse_after_loop = 1;
4598 if (flag_non_call_exceptions)
4599 flag_asynchronous_unwind_tables = 1;
4600 if (flag_asynchronous_unwind_tables)
4601 flag_unwind_tables = 1;
4603 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4605 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4606 flag_unit_at_a_time = 0;
4608 /* Warn about options that are not supported on this machine. */
4609 #ifndef INSN_SCHEDULING
4610 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4611 warning ("instruction scheduling not supported on this target machine");
4614 if (flag_delayed_branch)
4615 warning ("this target machine does not have delayed branches");
4618 user_label_prefix = USER_LABEL_PREFIX;
4619 if (flag_leading_underscore != -1)
4621 /* If the default prefix is more complicated than "" or "_",
4622 issue a warning and ignore this option. */
4623 if (user_label_prefix[0] == 0 ||
4624 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4626 user_label_prefix = flag_leading_underscore ? "_" : "";
4629 warning ("-f%sleading-underscore not supported on this target machine",
4630 flag_leading_underscore ? "" : "no-");
4633 /* If we are in verbose mode, write out the version and maybe all the
4634 option flags in use. */
4637 print_version (stderr, "");
4639 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4642 if (flag_syntax_only)
4644 write_symbols = NO_DEBUG;
4648 /* Now we know write_symbols, set up the debug hooks based on it.
4649 By default we do nothing for debug output. */
4650 #if defined(DBX_DEBUGGING_INFO)
4651 if (write_symbols == DBX_DEBUG)
4652 debug_hooks = &dbx_debug_hooks;
4654 #if defined(XCOFF_DEBUGGING_INFO)
4655 if (write_symbols == XCOFF_DEBUG)
4656 debug_hooks = &xcoff_debug_hooks;
4658 #ifdef SDB_DEBUGGING_INFO
4659 if (write_symbols == SDB_DEBUG)
4660 debug_hooks = &sdb_debug_hooks;
4662 #ifdef DWARF_DEBUGGING_INFO
4663 if (write_symbols == DWARF_DEBUG)
4664 debug_hooks = &dwarf_debug_hooks;
4666 #ifdef DWARF2_DEBUGGING_INFO
4667 if (write_symbols == DWARF2_DEBUG)
4668 debug_hooks = &dwarf2_debug_hooks;
4670 #ifdef VMS_DEBUGGING_INFO
4671 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4672 debug_hooks = &vmsdbg_debug_hooks;
4675 /* If auxiliary info generation is desired, open the output file.
4676 This goes in the same directory as the source file--unlike
4677 all the other output files. */
4678 if (flag_gen_aux_info)
4680 aux_info_file = fopen (aux_info_file_name, "w");
4681 if (aux_info_file == 0)
4682 fatal_error ("can't open %s: %m", aux_info_file_name);
4685 if (! targetm.have_named_sections)
4687 if (flag_function_sections)
4689 warning ("-ffunction-sections not supported for this target");
4690 flag_function_sections = 0;
4692 if (flag_data_sections)
4694 warning ("-fdata-sections not supported for this target");
4695 flag_data_sections = 0;
4699 if (flag_function_sections && profile_flag)
4701 warning ("-ffunction-sections disabled; it makes profiling impossible");
4702 flag_function_sections = 0;
4705 #ifndef HAVE_prefetch
4706 if (flag_prefetch_loop_arrays)
4708 warning ("-fprefetch-loop-arrays not supported for this target");
4709 flag_prefetch_loop_arrays = 0;
4712 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4714 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4715 flag_prefetch_loop_arrays = 0;
4719 /* This combination of options isn't handled for i386 targets and doesn't
4720 make much sense anyway, so don't allow it. */
4721 if (flag_prefetch_loop_arrays && optimize_size)
4723 warning ("-fprefetch-loop-arrays is not supported with -Os");
4724 flag_prefetch_loop_arrays = 0;
4727 #ifndef OBJECT_FORMAT_ELF
4728 if (flag_function_sections && write_symbols != NO_DEBUG)
4729 warning ("-ffunction-sections may affect debugging on some targets");
4732 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4733 if (flag_signaling_nans)
4734 flag_trapping_math = 1;
4737 /* Initialize the compiler back end. */
4741 /* init_emit_once uses reg_raw_mode and therefore must be called
4742 after init_regs which initialized reg_raw_mode. */
4744 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4745 || debug_info_level == DINFO_LEVEL_VERBOSE
4746 #ifdef VMS_DEBUGGING_INFO
4747 /* Enable line number info for traceback. */
4748 || debug_info_level > DINFO_LEVEL_NONE
4750 || flag_test_coverage
4751 || warn_notreached);
4752 init_fake_stack_mems ();
4756 init_function_once ();
4757 init_varasm_once ();
4759 /* The following initialization functions need to generate rtl, so
4760 provide a dummy function context for them. */
4761 init_dummy_function_start ();
4763 if (flag_caller_saves)
4764 init_caller_save ();
4765 expand_dummy_function_end ();
4768 /* Language-dependent initialization. Returns nonzero on success. */
4770 lang_dependent_init (const char *name)
4772 if (dump_base_name == 0)
4773 dump_base_name = name ? name : "gccdump";
4775 /* Other front-end initialization. */
4776 if ((*lang_hooks.init) () == 0)
4779 init_asm_output (name);
4781 /* These create various _DECL nodes, so need to be called after the
4782 front end is initialized. */
4786 /* The following initialization functions need to generate rtl, so
4787 provide a dummy function context for them. */
4788 init_dummy_function_start ();
4790 expand_dummy_function_end ();
4792 /* If dbx symbol table desired, initialize writing it and output the
4793 predefined types. */
4794 timevar_push (TV_SYMOUT);
4796 #ifdef DWARF2_UNWIND_INFO
4797 if (dwarf2out_do_frame ())
4798 dwarf2out_frame_init ();
4801 /* Now we have the correct original filename, we can initialize
4803 (*debug_hooks->init) (name);
4805 timevar_pop (TV_SYMOUT);
4810 /* Clean up: close opened files, etc. */
4815 /* Close the dump files. */
4816 if (flag_gen_aux_info)
4818 fclose (aux_info_file);
4820 unlink (aux_info_file_name);
4823 /* Close non-debugging input and output files. Take special care to note
4824 whether fclose returns an error, since the pages might still be on the
4825 buffer chain while the file is open. */
4829 if (ferror (asm_out_file) != 0)
4830 fatal_error ("error writing to %s: %m", asm_file_name);
4831 if (fclose (asm_out_file) != 0)
4832 fatal_error ("error closing %s: %m", asm_file_name);
4835 /* Do whatever is necessary to finish printing the graphs. */
4836 if (graph_dump_format != no_graph)
4840 for (i = 0; i < (int) DFI_MAX; ++i)
4841 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4846 sprintf (seq, DUMPFILE_FORMAT, i);
4847 suffix = concat (seq, dump_file[i].extension, NULL);
4848 finish_graph_dump_file (dump_base_name, suffix);
4855 ggc_print_statistics ();
4856 stringpool_statistics ();
4857 dump_tree_statistics ();
4860 /* Free up memory for the benefit of leak detectors. */
4863 /* Language-specific end of compilation actions. */
4864 (*lang_hooks.finish) ();
4867 /* Initialize the compiler, and compile the input file. */
4871 /* Initialize timing first. The C front ends read the main file in
4872 the post_options hook, and C++ does file timings. */
4873 if (time_report || !quiet_flag || flag_detailed_statistics)
4875 timevar_start (TV_TOTAL);
4879 /* Don't do any more if an error has already occurred. */
4882 /* Set up the back-end if requested. */
4886 if (flag_unit_at_a_time)
4888 open_dump_file (DFI_cgraph, NULL);
4889 cgraph_dump_file = rtl_dump_file;
4890 rtl_dump_file = NULL;
4892 /* Language-dependent initialization. Returns true on success. */
4893 if (lang_dependent_init (main_input_filename))
4896 if (flag_unit_at_a_time)
4898 rtl_dump_file = cgraph_dump_file;
4899 cgraph_dump_file = NULL;
4900 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4906 /* Stop timing and print the times. */
4907 timevar_stop (TV_TOTAL);
4908 timevar_print (stderr);
4911 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4912 Decode command args, then call compile_file.
4913 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4914 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4916 It is not safe to call this function more than once. */
4919 toplev_main (unsigned int argc, const char **argv)
4923 /* Initialization of GCC's environment, and diagnostics. */
4924 general_init (argv[0]);
4926 /* Parse the options and do minimal processing; basically just
4927 enough to default flags appropriately. */
4928 decode_options (argc, argv);
4932 /* Exit early if we can (e.g. -help). */
4933 if (!exit_after_options)
4936 if (errorcount || sorrycount)
4937 return (FATAL_EXIT_CODE);
4939 return (SUCCESS_EXIT_CODE);