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"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
73 #include "langhooks.h"
74 #include "cfglayout.h"
76 #include "hosthooks.h"
80 #include "value-prof.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* 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 void rest_of_handle_cse (tree, rtx);
128 static void rest_of_handle_cse2 (tree, rtx);
129 static void rest_of_handle_gcse (tree, rtx);
130 static void rest_of_handle_life (tree, rtx);
131 static void rest_of_handle_loop_optimize (tree, rtx);
132 static void rest_of_handle_loop2 (tree, rtx);
133 static void rest_of_handle_jump_bypass (tree, rtx);
134 static void rest_of_handle_sibling_calls (rtx);
135 static void rest_of_handle_null_pointer (tree, rtx);
136 static void rest_of_handle_addressof (tree, rtx);
137 static void rest_of_handle_cfg (tree, rtx);
138 static void rest_of_handle_branch_prob (tree, rtx);
139 static void rest_of_handle_value_profile_transformations (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);
150 static bool rest_of_handle_old_regalloc (tree, rtx);
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;
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. */
282 DFI_branch_target_load,
290 /* Describes all the dump files. Should be kept in order of the
291 pass and in sync with dump_file_index above.
293 Remaining -d letters:
299 static struct dump_file_info dump_file[DFI_MAX] =
301 { "cgraph", 'U', 0, 0, 0 },
302 { "rtl", 'r', 0, 0, 0 },
303 { "sibling", 'i', 0, 0, 0 },
304 { "eh", 'h', 0, 0, 0 },
305 { "jump", 'j', 0, 0, 0 },
306 { "null", 'u', 0, 0, 0 },
307 { "cse", 's', 0, 0, 0 },
308 { "addressof", 'F', 0, 0, 0 },
309 { "gcse", 'G', 1, 0, 0 },
310 { "loop", 'L', 1, 0, 0 },
311 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "cfg", 'f', 1, 0, 0 },
313 { "bp", 'b', 1, 0, 0 },
314 { "vpt", 'V', 1, 0, 0 },
315 { "ce1", 'C', 1, 0, 0 },
316 { "tracer", 'T', 1, 0, 0 },
317 { "loop2", 'L', 1, 0, 0 },
318 { "web", 'Z', 0, 0, 0 },
319 { "cse2", 't', 1, 0, 0 },
320 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
321 { "combine", 'c', 1, 0, 0 },
322 { "ce2", 'C', 1, 0, 0 },
323 { "regmove", 'N', 1, 0, 0 },
324 { "sched", 'S', 1, 0, 0 },
325 { "lreg", 'l', 1, 0, 0 },
326 { "greg", 'g', 1, 0, 0 },
327 { "postreload", 'o', 1, 0, 0 },
328 { "flow2", 'w', 1, 0, 0 },
329 { "peephole2", 'z', 1, 0, 0 },
330 { "rnreg", 'n', 1, 0, 0 },
331 { "bbro", 'B', 1, 0, 0 },
332 { "ce3", 'E', 1, 0, 0 },
333 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
334 { "sched2", 'R', 1, 0, 0 },
335 { "stack", 'k', 1, 0, 0 },
336 { "mach", 'M', 1, 0, 0 },
337 { "dbr", 'd', 0, 0, 0 },
340 static int open_dump_file (enum dump_file_index, tree);
341 static void close_dump_file (enum dump_file_index,
342 void (*) (FILE *, rtx), rtx);
344 /* Other flags saying which kinds of debugging dump have been requested. */
346 int rtl_dump_and_exit;
347 int flag_print_asm_name;
348 enum graph_dump_types graph_dump_format;
350 /* Name for output file of assembly code, specified with -o. */
352 const char *asm_file_name;
354 /* Nonzero means do optimizations. -O.
355 Particular numeric values stand for particular amounts of optimization;
356 thus, -O2 stores 2 here. However, the optimizations beyond the basic
357 ones are not controlled directly by this variable. Instead, they are
358 controlled by individual `flag_...' variables that are defaulted
359 based on this variable. */
363 /* Nonzero means optimize for size. -Os.
364 The only valid values are zero and nonzero. When optimize_size is
365 nonzero, optimize defaults to 2, but certain individual code
366 bloating optimizations are disabled. */
368 int optimize_size = 0;
370 /* The FUNCTION_DECL for the function currently being compiled,
371 or 0 if between functions. */
372 tree current_function_decl;
374 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
376 tree current_function_func_begin_label;
378 /* Nonzero if doing dwarf2 duplicate elimination. */
380 int flag_eliminate_dwarf2_dups = 0;
382 /* Nonzero if doing unused type elimination. */
384 int flag_eliminate_unused_debug_types = 1;
386 /* Nonzero means emit debugging information only for symbols which are used. */
387 int flag_debug_only_used_symbols = 0;
389 /* Nonzero if generating code to do profiling. */
391 int profile_flag = 0;
393 /* Nonzero if generating code to profile program flow graph arcs. */
395 int profile_arc_flag = 0;
397 /* Nonzero if value histograms should be measured. */
399 int flag_profile_values = 0;
401 /* Nonzero if value histograms should be used to optimize code. */
402 int flag_value_profile_transformations = 0;
404 /* Nonzero if generating info for gcov to calculate line test coverage. */
406 int flag_test_coverage = 0;
408 /* Nonzero indicates that branch taken probabilities should be calculated. */
410 int flag_branch_probabilities = 0;
412 /* Nonzero if basic blocks should be reordered. */
414 int flag_reorder_blocks = 0;
416 /* Nonzero if functions should be reordered. */
418 int flag_reorder_functions = 0;
420 /* Nonzero if registers should be renamed. */
422 int flag_rename_registers = 0;
423 int flag_cprop_registers = 0;
425 /* Nonzero for -pedantic switch: warn about anything
426 that standard spec forbids. */
430 /* Temporarily suppress certain warnings.
431 This is set while reading code from a system header file. */
433 int in_system_header = 0;
435 /* Don't print functions as they are compiled. -quiet. */
439 /* Print times taken by the various passes. -ftime-report. */
443 /* Print memory still in use at end of compilation (which may have little
444 to do with peak memory consumption). -fmem-report. */
448 /* Nonzero means to collect statistics which might be expensive
449 and to print them when we are done. */
450 int flag_detailed_statistics = 0;
452 /* A random sequence of characters, unless overridden by user. */
453 const char *flag_random_seed;
455 /* A local time stamp derived from the time of compilation. It will be
456 zero if the system cannot provide a time. It will be -1u, if the
457 user has specified a particular random seed. */
462 /* Nonzero means `char' should be signed. */
464 int flag_signed_char;
466 /* Nonzero means give an enum type only as many bytes as it needs. */
468 int flag_short_enums;
470 /* Nonzero for -fcaller-saves: allocate values in regs that need to
471 be saved across function calls, if that produces overall better code.
472 Optional now, so people can test it. */
474 #ifdef DEFAULT_CALLER_SAVES
475 int flag_caller_saves = 1;
477 int flag_caller_saves = 0;
480 /* Nonzero if structures and unions should be returned in memory.
482 This should only be defined if compatibility with another compiler or
483 with an ABI is needed, because it results in slower code. */
485 #ifndef DEFAULT_PCC_STRUCT_RETURN
486 #define DEFAULT_PCC_STRUCT_RETURN 1
489 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
491 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
493 /* Nonzero for -fforce-mem: load memory value into a register
494 before arithmetic on it. This makes better cse but slower compilation. */
496 int flag_force_mem = 0;
498 /* Nonzero for -fforce-addr: load memory address into a register before
499 reference to memory. This makes better cse but slower compilation. */
501 int flag_force_addr = 0;
503 /* Nonzero for -fdefer-pop: don't pop args after each function call;
504 instead save them up to pop many calls' args with one insns. */
506 int flag_defer_pop = 0;
508 /* Nonzero for -ffloat-store: don't allocate floats and doubles
509 in extended-precision registers. */
511 int flag_float_store = 0;
513 /* Nonzero for -fcse-follow-jumps:
514 have cse follow jumps to do a more extensive job. */
516 int flag_cse_follow_jumps;
518 /* Nonzero for -fcse-skip-blocks:
519 have cse follow a branch around a block. */
520 int flag_cse_skip_blocks;
522 /* Nonzero for -fexpensive-optimizations:
523 perform miscellaneous relatively-expensive optimizations. */
524 int flag_expensive_optimizations;
526 /* Nonzero for -fthread-jumps:
527 have jump optimize output of loop. */
529 int flag_thread_jumps;
531 /* Nonzero enables strength-reduction in loop.c. */
533 int flag_strength_reduce = 0;
535 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
536 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
537 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
540 int flag_old_unroll_loops;
542 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
543 This is generally not a win. */
545 int flag_old_unroll_all_loops;
547 /* Enables unrolling of simple loops in loop-unroll.c. */
548 int flag_unroll_loops;
550 /* Enables unrolling of all loops in loop-unroll.c. */
551 int flag_unroll_all_loops;
553 /* Nonzero enables loop peeling. */
556 /* Nonzero enables loop unswitching. */
557 int flag_unswitch_loops;
559 /* Nonzero enables prefetch optimizations for arrays in loops. */
561 int flag_prefetch_loop_arrays;
563 /* Nonzero forces all invariant computations in loops to be moved
566 int flag_move_all_movables = 0;
568 /* Nonzero forces all general induction variables in loops to be
571 int flag_reduce_all_givs = 0;
573 /* Nonzero to perform full register move optimization passes. This is the
576 int flag_regmove = 0;
578 /* Nonzero for -fwritable-strings:
579 store string constants in data segment and don't uniquize them. */
581 int flag_writable_strings = 0;
583 /* Nonzero means don't put addresses of constant functions in registers.
584 Used for compiling the Unix kernel, where strange substitutions are
585 done on the assembly output. */
587 int flag_no_function_cse = 0;
589 /* Nonzero for -fomit-frame-pointer:
590 don't make a frame pointer in simple functions that don't require one. */
592 int flag_omit_frame_pointer = 0;
594 /* Nonzero means place each function into its own section on those platforms
595 which support arbitrary section names and unlimited numbers of sections. */
597 int flag_function_sections = 0;
599 /* ... and similar for data. */
601 int flag_data_sections = 0;
603 /* Nonzero to inhibit use of define_optimization peephole opts. */
605 int flag_no_peephole = 0;
607 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
609 int flag_optimize_sibling_calls = 0;
611 /* Nonzero means the front end generally wants `errno' maintained by math
612 operations, like built-in SQRT. */
614 int flag_errno_math = 1;
616 /* Nonzero means that unsafe floating-point math optimizations are allowed
617 for the sake of speed. IEEE compliance is not guaranteed, and operations
618 are allowed to assume that their arguments and results are "normal"
619 (e.g., nonnegative for SQRT). */
621 int flag_unsafe_math_optimizations = 0;
623 /* Nonzero means that no NaNs or +-Infs are expected. */
625 int flag_finite_math_only = 0;
627 /* Zero means that floating-point math operations cannot generate a
628 (user-visible) trap. This is the case, for example, in nonstop
629 IEEE 754 arithmetic. Trapping conditions include division by zero,
630 overflow, underflow, invalid and inexact, but does not include
631 operations on signaling NaNs (see below). */
633 int flag_trapping_math = 1;
635 /* Nonzero means disable transformations that assume default floating
636 point rounding behavior. */
638 int flag_rounding_math = 0;
640 /* Nonzero means disable transformations observable by signaling NaNs.
641 This option implies that any operation on an IEEE signaling NaN can
642 generate a (user-visible) trap. */
644 int flag_signaling_nans = 0;
646 /* 0 means straightforward implementation of complex divide acceptable.
647 1 means wide ranges of inputs must work for complex divide.
648 2 means C99-like requirements for complex divide (not yet implemented). */
650 int flag_complex_divide_method = 0;
652 /* Nonzero means just do syntax checking; don't output anything. */
654 int flag_syntax_only = 0;
656 /* Nonzero means performs web construction pass. */
660 /* Nonzero means perform loop optimizer. */
662 int flag_loop_optimize;
664 /* Nonzero means perform crossjumping. */
666 int flag_crossjumping;
668 /* Nonzero means perform if conversion. */
670 int flag_if_conversion;
672 /* Nonzero means perform if conversion after reload. */
674 int flag_if_conversion2;
676 /* Nonzero means to use global dataflow analysis to eliminate
677 useless null pointer tests. */
679 int flag_delete_null_pointer_checks;
681 /* Nonzero means perform global CSE. */
685 /* Nonzero means to do the enhanced load motion during gcse, which trys
686 to hoist loads by not killing them when a store to the same location
689 int flag_gcse_lm = 1;
691 /* Nonzero means to perform store motion after gcse, which will try to
692 move stores closer to the exit block. Its not very effective without
695 int flag_gcse_sm = 1;
697 /* Nonzero if we want to perfrom redundant load after store elimination
700 int flag_gcse_las = 1;
702 /* Perform target register optimization before prologue / epilogue
705 int flag_branch_target_load_optimize = 0;
707 /* Perform target register optimization after prologue / epilogue
708 threading and jump2. */
710 int flag_branch_target_load_optimize2 = 0;
712 /* Nonzero means to rerun cse after loop optimization. This increases
713 compilation time about 20% and picks up a few more common expressions. */
715 int flag_rerun_cse_after_loop;
717 /* Nonzero means to run loop optimizations twice. */
719 int flag_rerun_loop_opt;
721 /* Nonzero for -finline-functions: ok to inline functions that look like
722 good inline candidates. */
724 int flag_inline_functions;
726 /* Nonzero for -fkeep-inline-functions: even if we make a function
727 go inline everywhere, keep its definition around for debugging
730 int flag_keep_inline_functions;
732 /* Nonzero means that functions will not be inlined. */
734 int flag_no_inline = 2;
736 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
737 not just because the tree inliner turned us off. */
739 int flag_really_no_inline = 2;
741 /* Nonzero means that we should emit static const variables
742 regardless of whether or not optimization is turned on. */
744 int flag_keep_static_consts = 1;
746 /* Nonzero means we should be saving declaration info into a .X file. */
748 int flag_gen_aux_info = 0;
750 /* Specified name of aux-info file. */
752 const char *aux_info_file_name;
754 /* Nonzero means make the text shared if supported. */
756 int flag_shared_data;
758 /* Nonzero means schedule into delayed branch slots if supported. */
760 int flag_delayed_branch;
762 /* Nonzero if we are compiling pure (sharable) code.
763 Value is 1 if we are doing "small" pic; value is 2 if we're doing
768 /* Nonzero if we are compiling position independent code for executable.
769 The value is 1 if we are doing "small" pic; value is 2 if we're doing
774 /* Nonzero if we are compiling code for a shared library, zero for
779 /* Set to the default thread-local storage (tls) model to use. */
781 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
783 /* Nonzero means generate extra code for exception handling and enable
784 exception handling. */
788 /* Nonzero means generate frame unwind info table when supported. */
790 int flag_unwind_tables = 0;
792 /* Nonzero means generate frame unwind info table exact at each insn
795 int flag_asynchronous_unwind_tables = 0;
797 /* Nonzero means don't place uninitialized global data in common storage
802 /* Nonzero means change certain warnings into errors.
803 Usually these are warnings about failure to conform to some standard. */
805 int flag_pedantic_errors = 0;
807 /* flag_schedule_insns means schedule insns within basic blocks (before
809 flag_schedule_insns_after_reload means schedule insns after
812 int flag_schedule_insns = 0;
813 int flag_schedule_insns_after_reload = 0;
815 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
816 int flag_sched2_use_superblocks = 0;
818 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
820 int flag_sched2_use_traces = 0;
822 /* The following flags have effect only for scheduling before register
825 flag_schedule_interblock means schedule insns across basic blocks.
826 flag_schedule_speculative means allow speculative motion of non-load insns.
827 flag_schedule_speculative_load means allow speculative motion of some
829 flag_schedule_speculative_load_dangerous allows speculative motion of more
832 int flag_schedule_interblock = 1;
833 int flag_schedule_speculative = 1;
834 int flag_schedule_speculative_load = 0;
835 int flag_schedule_speculative_load_dangerous = 0;
837 /* The following flags have an effect during scheduling after register
840 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
841 of stalled insns into the ready list.
843 flag_sched_stalled_insns_dep controls how many insn groups will be examined
844 for a dependency on a stalled insn that is candidate for premature removal
845 from the queue of stalled insns into the ready list (has an effect only if
846 the flag 'sched_stalled_insns' is set). */
848 int flag_sched_stalled_insns = 0;
849 int flag_sched_stalled_insns_dep = 1;
851 int flag_single_precision_constant;
853 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
854 by a cheaper branch on a count register. */
855 int flag_branch_on_count_reg = 1;
857 /* -finhibit-size-directive inhibits output of .size for ELF.
858 This is used only for compiling crtstuff.c,
859 and it may be extended to other effects
860 needed for crtstuff.c on other systems. */
861 int flag_inhibit_size_directive = 0;
863 /* -fverbose-asm causes extra commentary information to be produced in
864 the generated assembly code (to make it more readable). This option
865 is generally only of use to those who actually need to read the
866 generated assembly code (perhaps while debugging the compiler itself).
867 -fno-verbose-asm, the default, causes the extra information
868 to be omitted and is useful when comparing two assembler files. */
870 int flag_verbose_asm = 0;
872 /* -dA causes debug commentary information to be produced in
873 the generated assembly code (to make it more readable). This option
874 is generally only of use to those who actually need to read the
875 generated assembly code (perhaps while debugging the compiler itself).
876 Currently, this switch is only used by dwarfout.c; however, it is intended
877 to be a catchall for printing debug information in the assembler file. */
879 int flag_debug_asm = 0;
881 /* -dP causes the rtl to be emitted as a comment in assembly. */
883 int flag_dump_rtl_in_asm = 0;
885 /* -fgnu-linker specifies use of the GNU linker for initializations.
886 (Or, more generally, a linker that handles initializations.)
887 -fno-gnu-linker says that collect2 will be used. */
889 int flag_gnu_linker = 0;
891 int flag_gnu_linker = 1;
894 /* Nonzero means put zero initialized data in the bss section. */
895 int flag_zero_initialized_in_bss = 1;
897 /* Tag all structures with __attribute__(packed). */
898 int flag_pack_struct = 0;
900 /* Emit code to check for stack overflow; also may cause large objects
901 to be allocated dynamically. */
902 int flag_stack_check;
904 /* When non-NULL, indicates that whenever space is allocated on the
905 stack, the resulting stack pointer must not pass this
906 address---that is, for stacks that grow downward, the stack pointer
907 must always be greater than or equal to this address; for stacks
908 that grow upward, the stack pointer must be less than this address.
909 At present, the rtx may be either a REG or a SYMBOL_REF, although
910 the support provided depends on the backend. */
913 /* 0 if pointer arguments may alias each other. True in C.
914 1 if pointer arguments may not alias each other but may alias
916 2 if pointer arguments may not alias each other and may not
917 alias global variables. True in Fortran.
918 This defaults to 0 for C. */
919 int flag_argument_noalias = 0;
921 /* Nonzero if we should do (language-dependent) alias analysis.
922 Typically, this analysis will assume that expressions of certain
923 types do not alias expressions of certain other types. Only used
924 if alias analysis (in general) is enabled. */
925 int flag_strict_aliasing = 0;
927 /* Instrument functions with calls at entry and exit, for profiling. */
928 int flag_instrument_function_entry_exit = 0;
930 /* Nonzero means ignore `#ident' directives. 0 means handle them.
931 On SVR4 targets, it also controls whether or not to emit a
932 string identifying the compiler. */
934 int flag_no_ident = 0;
936 /* This will perform a peephole pass before sched2. */
937 int flag_peephole2 = 0;
939 /* This will try to guess branch probabilities. */
940 int flag_guess_branch_prob = 0;
942 /* -fcheck-bounds causes gcc to generate array bounds checks.
943 For C, C++, ObjC: defaults to off.
944 For Java: defaults to on.
945 For Fortran: defaults to off. */
946 int flag_bounds_check = 0;
948 /* This will attempt to merge constant section constants, if 1 only
949 string constants and constants from constant pool, if 2 also constant
951 int flag_merge_constants = 1;
953 /* If one, renumber instruction UIDs to reduce the number of
954 unused UIDs if there are a lot of instructions. If greater than
955 one, unconditionally renumber instruction UIDs. */
956 int flag_renumber_insns = 1;
958 /* If nonzero, use the graph coloring register allocator. */
959 int flag_new_regalloc = 0;
961 /* Nonzero if we perform superblock formation. */
965 /* Nonzero if we perform whole unit at a time compilation. */
967 int flag_unit_at_a_time = 0;
969 /* Values of the -falign-* flags: how much to align labels in code.
970 0 means `use default', 1 means `don't align'.
971 For each variable, there is an _log variant which is the power
972 of two not less than the variable, for .align output. */
976 int align_loops_max_skip;
979 int align_jumps_max_skip;
981 int align_labels_log;
982 int align_labels_max_skip;
984 int align_functions_log;
986 /* Like align_functions_log above, but used by front-ends to force the
987 minimum function alignment. Zero means no alignment is forced. */
988 int force_align_functions_log;
992 const char *const string;
996 lang_independent_options;
998 /* Nonzero if signed arithmetic overflow should trap. */
1001 /* Nonzero if signed arithmetic overflow should wrap around. */
1004 /* Nonzero if subexpressions must be evaluated from left-to-right. */
1005 int flag_evaluation_order = 0;
1007 /* Add or remove a leading underscore from user symbols. */
1008 int flag_leading_underscore = -1;
1010 /* The user symbol prefix after having resolved same. */
1011 const char *user_label_prefix;
1013 static const param_info lang_independent_params[] = {
1014 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1015 { OPTION, DEFAULT, HELP },
1016 #include "params.def"
1021 /* Table of language-independent -f options.
1022 STRING is the option name. VARIABLE is the address of the variable.
1023 ON_VALUE is the value to store in VARIABLE
1024 if `-fSTRING' is seen as an option.
1025 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1027 static const lang_independent_options f_options[] =
1029 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1030 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1031 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1032 {"float-store", &flag_float_store, 1 },
1033 {"defer-pop", &flag_defer_pop, 1 },
1034 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1035 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1036 {"tracer", &flag_tracer, 1 },
1037 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1038 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1039 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1040 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1041 {"thread-jumps", &flag_thread_jumps, 1 },
1042 {"strength-reduce", &flag_strength_reduce, 1 },
1043 {"unroll-loops", &flag_unroll_loops, 1 },
1044 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1045 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1046 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1047 {"peel-loops", &flag_peel_loops, 1 },
1048 {"unswitch-loops", &flag_unswitch_loops, 1 },
1049 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1050 {"move-all-movables", &flag_move_all_movables, 1 },
1051 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1052 {"writable-strings", &flag_writable_strings, 1 },
1053 {"peephole", &flag_no_peephole, 0 },
1054 {"force-mem", &flag_force_mem, 1 },
1055 {"force-addr", &flag_force_addr, 1 },
1056 {"function-cse", &flag_no_function_cse, 0 },
1057 {"inline-functions", &flag_inline_functions, 1 },
1058 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1059 {"inline", &flag_no_inline, 0 },
1060 {"keep-static-consts", &flag_keep_static_consts, 1 },
1061 {"syntax-only", &flag_syntax_only, 1 },
1062 {"shared-data", &flag_shared_data, 1 },
1063 {"caller-saves", &flag_caller_saves, 1 },
1064 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1065 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1066 {"delayed-branch", &flag_delayed_branch, 1 },
1067 {"web", &flag_web, 1},
1068 {"gcse", &flag_gcse, 1 },
1069 {"gcse-lm", &flag_gcse_lm, 1 },
1070 {"gcse-sm", &flag_gcse_sm, 1 },
1071 {"gcse-las", &flag_gcse_las, 1 },
1072 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1073 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1074 {"loop-optimize", &flag_loop_optimize, 1 },
1075 {"crossjumping", &flag_crossjumping, 1 },
1076 {"if-conversion", &flag_if_conversion, 1 },
1077 {"if-conversion2", &flag_if_conversion2, 1 },
1078 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1079 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1080 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1081 {"schedule-insns", &flag_schedule_insns, 1 },
1082 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1083 {"sched-interblock",&flag_schedule_interblock, 1 },
1084 {"sched-spec",&flag_schedule_speculative, 1 },
1085 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1086 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1087 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1088 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1089 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1090 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1091 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1092 {"pic", &flag_pic, 1 },
1093 {"PIC", &flag_pic, 2 },
1094 {"pie", &flag_pie, 1 },
1095 {"PIE", &flag_pie, 2 },
1096 {"exceptions", &flag_exceptions, 1 },
1097 {"unwind-tables", &flag_unwind_tables, 1 },
1098 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1099 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1100 {"profile-arcs", &profile_arc_flag, 1 },
1101 {"profile-values", &flag_profile_values, 1 },
1102 {"vpt", &flag_value_profile_transformations, 1 },
1103 {"test-coverage", &flag_test_coverage, 1 },
1104 {"branch-probabilities", &flag_branch_probabilities, 1 },
1105 {"profile", &profile_flag, 1 },
1106 {"reorder-blocks", &flag_reorder_blocks, 1 },
1107 {"reorder-functions", &flag_reorder_functions, 1 },
1108 {"rename-registers", &flag_rename_registers, 1 },
1109 {"cprop-registers", &flag_cprop_registers, 1 },
1110 {"common", &flag_no_common, 0 },
1111 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1112 {"function-sections", &flag_function_sections, 1 },
1113 {"data-sections", &flag_data_sections, 1 },
1114 {"verbose-asm", &flag_verbose_asm, 1 },
1115 {"gnu-linker", &flag_gnu_linker, 1 },
1116 {"regmove", &flag_regmove, 1 },
1117 {"optimize-register-move", &flag_regmove, 1 },
1118 {"pack-struct", &flag_pack_struct, 1 },
1119 {"stack-check", &flag_stack_check, 1 },
1120 {"argument-alias", &flag_argument_noalias, 0 },
1121 {"argument-noalias", &flag_argument_noalias, 1 },
1122 {"argument-noalias-global", &flag_argument_noalias, 2 },
1123 {"strict-aliasing", &flag_strict_aliasing, 1 },
1124 {"align-loops", &align_loops, 0 },
1125 {"align-jumps", &align_jumps, 0 },
1126 {"align-labels", &align_labels, 0 },
1127 {"align-functions", &align_functions, 0 },
1128 {"merge-constants", &flag_merge_constants, 1 },
1129 {"merge-all-constants", &flag_merge_constants, 2 },
1130 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1131 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1132 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1133 {"leading-underscore", &flag_leading_underscore, 1 },
1134 {"ident", &flag_no_ident, 0 },
1135 { "peephole2", &flag_peephole2, 1 },
1136 {"finite-math-only", &flag_finite_math_only, 1 },
1137 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1138 {"math-errno", &flag_errno_math, 1 },
1139 {"trapping-math", &flag_trapping_math, 1 },
1140 {"rounding-math", &flag_rounding_math, 1 },
1141 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1142 {"signaling-nans", &flag_signaling_nans, 1 },
1143 {"bounds-check", &flag_bounds_check, 1 },
1144 {"single-precision-constant", &flag_single_precision_constant, 1 },
1145 {"time-report", &time_report, 1 },
1146 {"mem-report", &mem_report, 1 },
1147 { "trapv", &flag_trapv, 1 },
1148 { "wrapv", &flag_wrapv, 1 },
1149 { "new-ra", &flag_new_regalloc, 1 }
1152 /* Here is a table, controlled by the tm.h file, listing each -m switch
1153 and which bits in `target_switches' it should set or clear.
1154 If VALUE is positive, it is bits to set.
1155 If VALUE is negative, -VALUE is bits to clear.
1156 (The sign bit is not used so there is no confusion.) */
1160 const char *const name;
1162 const char *const description;
1164 target_switches[] = TARGET_SWITCHES;
1166 /* This table is similar, but allows the switch to have a value. */
1168 #ifdef TARGET_OPTIONS
1171 const char *const prefix;
1172 const char **const variable;
1173 const char *const description;
1174 const char *const value;
1176 target_options[] = TARGET_OPTIONS;
1179 /* Nonzero means warn about function definitions that default the return type
1180 or that use a null return and have a return-type other than void. */
1182 int warn_return_type;
1184 /* Output files for assembler code (real compiler output)
1185 and debugging dumps. */
1188 FILE *aux_info_file;
1189 FILE *rtl_dump_file = NULL;
1190 FILE *cgraph_dump_file = NULL;
1192 /* The current working directory of a translation. It's generally the
1193 directory from which compilation was initiated, but a preprocessed
1194 file may specify the original directory in which it was
1197 static const char *src_pwd;
1199 /* Initialize src_pwd with the given string, and return true. If it
1200 was already initialized, return false. As a special case, it may
1201 be called with a NULL argument to test whether src_pwd has NOT been
1205 set_src_pwd (const char *pwd)
1210 src_pwd = xstrdup (pwd);
1214 /* Return the directory from which the translation unit was initiated,
1215 in case set_src_pwd() was not called before to assign it a
1222 src_pwd = getpwd ();
1227 /* Called when the start of a function definition is parsed,
1228 this function prints on stderr the name of the function. */
1230 announce_function (tree decl)
1234 if (rtl_dump_and_exit)
1235 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1237 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1239 pp_needs_newline (global_dc->printer) = true;
1240 diagnostic_set_last_function (global_dc);
1244 /* Set up a default flag_random_seed and local_tick, unless the user
1245 already specified one. */
1250 if (!flag_random_seed)
1252 unsigned HOST_WIDE_INT value;
1253 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1255 /* Get some more or less random data. */
1256 #ifdef HAVE_GETTIMEOFDAY
1260 gettimeofday (&tv, NULL);
1261 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1265 time_t now = time (NULL);
1267 if (now != (time_t)-1)
1268 local_tick = (unsigned) now;
1271 value = local_tick ^ getpid ();
1273 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1274 flag_random_seed = random_seed;
1276 else if (!local_tick)
1281 /* Decode the string P as an integral parameter.
1282 If the string is indeed an integer return its numeric value else
1283 issue an Invalid Option error for the option PNAME and return DEFVAL.
1284 If PNAME is zero just return DEFVAL, do not call error. */
1287 read_integral_parameter (const char *p, const char *pname, const int defval)
1289 const char *endp = p;
1293 if (ISDIGIT (*endp))
1302 error ("invalid option argument `%s'", pname);
1309 /* Return the logarithm of X, base 2, considering X unsigned,
1310 if X is a power of 2. Otherwise, returns -1.
1312 This should be used via the `exact_log2' macro. */
1315 exact_log2_wide (unsigned HOST_WIDE_INT x)
1318 /* Test for 0 or a power of 2. */
1319 if (x == 0 || x != (x & -x))
1321 while ((x >>= 1) != 0)
1326 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1327 If X is 0, return -1.
1329 This should be used via the floor_log2 macro. */
1332 floor_log2_wide (unsigned HOST_WIDE_INT x)
1341 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1342 into ICE messages, which is much more user friendly. In case the
1343 error printer crashes, reset the signal to prevent infinite recursion. */
1346 crash_signal (int signo)
1348 signal (signo, SIG_DFL);
1349 internal_error ("%s", strsignal (signo));
1352 /* Arrange to dump core on error. (The regular error message is still
1353 printed first, except in the case of abort().) */
1356 setup_core_dumping (void)
1359 signal (SIGABRT, SIG_DFL);
1361 #if defined(HAVE_SETRLIMIT)
1364 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1365 fatal_error ("getting core file size maximum limit: %m");
1366 rlim.rlim_cur = rlim.rlim_max;
1367 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1368 fatal_error ("setting core file size limit to maximum: %m");
1371 diagnostic_abort_on_error (global_dc);
1375 /* Strip off a legitimate source ending from the input string NAME of
1376 length LEN. Rather than having to know the names used by all of
1377 our front ends, we strip off an ending of a period followed by
1378 up to five characters. (Java uses ".class".) */
1381 strip_off_ending (char *name, int len)
1384 for (i = 2; i < 6 && len > i; i++)
1386 if (name[len - i] == '.')
1388 name[len - i] = '\0';
1394 /* Output a quoted string. */
1397 output_quoted_string (FILE *asm_file, const char *string)
1399 #ifdef OUTPUT_QUOTED_STRING
1400 OUTPUT_QUOTED_STRING (asm_file, string);
1404 putc ('\"', asm_file);
1405 while ((c = *string++) != 0)
1409 if (c == '\"' || c == '\\')
1410 putc ('\\', asm_file);
1414 fprintf (asm_file, "\\%03o", (unsigned char) c);
1416 putc ('\"', asm_file);
1420 /* Output a file name in the form wanted by System V. */
1423 output_file_directive (FILE *asm_file, const char *input_name)
1428 if (input_name == NULL)
1429 input_name = "<stdin>";
1431 len = strlen (input_name);
1432 na = input_name + len;
1434 /* NA gets INPUT_NAME sans directory names. */
1435 while (na > input_name)
1437 if (IS_DIR_SEPARATOR (na[-1]))
1442 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1443 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1445 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1446 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1448 fprintf (asm_file, "\t.file\t");
1449 output_quoted_string (asm_file, na);
1450 fputc ('\n', asm_file);
1455 /* Routine to open a dump file. Return true if the dump file is enabled. */
1458 open_dump_file (enum dump_file_index index, tree decl)
1461 const char *open_arg;
1464 if (! dump_file[index].enabled)
1467 timevar_push (TV_DUMP);
1468 if (rtl_dump_file != NULL)
1469 fclose (rtl_dump_file);
1471 sprintf (seq, DUMPFILE_FORMAT, index);
1473 if (! dump_file[index].initialized)
1475 /* If we've not initialized the files, do so now. */
1476 if (graph_dump_format != no_graph
1477 && dump_file[index].graph_dump_p)
1479 dump_name = concat (seq, dump_file[index].extension, NULL);
1480 clean_graph_dump_file (dump_base_name, dump_name);
1483 dump_file[index].initialized = 1;
1489 dump_name = concat (dump_base_name, seq,
1490 dump_file[index].extension, NULL);
1492 rtl_dump_file = fopen (dump_name, open_arg);
1493 if (rtl_dump_file == NULL)
1494 fatal_error ("can't open %s: %m", dump_name);
1499 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1500 (*lang_hooks.decl_printable_name) (decl, 2),
1501 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1503 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1504 ? " (unlikely executed)"
1507 timevar_pop (TV_DUMP);
1511 /* Routine to close a dump file. */
1514 close_dump_file (enum dump_file_index index,
1515 void (*func) (FILE *, rtx),
1518 if (! rtl_dump_file)
1521 timevar_push (TV_DUMP);
1523 && graph_dump_format != no_graph
1524 && dump_file[index].graph_dump_p)
1529 sprintf (seq, DUMPFILE_FORMAT, index);
1530 suffix = concat (seq, dump_file[index].extension, NULL);
1531 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1536 func (rtl_dump_file, insns);
1538 fflush (rtl_dump_file);
1539 fclose (rtl_dump_file);
1541 rtl_dump_file = NULL;
1542 timevar_pop (TV_DUMP);
1545 /* Do any final processing required for the declarations in VEC, of
1546 which there are LEN. We write out inline functions and variables
1547 that have been deferred until this point, but which are required.
1548 Returns nonzero if anything was put out. */
1551 wrapup_global_declarations (tree *vec, int len)
1556 int output_something = 0;
1558 for (i = 0; i < len; i++)
1562 /* We're not deferring this any longer. Assignment is
1563 conditional to avoid needlessly dirtying PCH pages. */
1564 if (DECL_DEFER_OUTPUT (decl) != 0)
1565 DECL_DEFER_OUTPUT (decl) = 0;
1567 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1568 (*lang_hooks.finish_incomplete_decl) (decl);
1571 /* Now emit any global variables or functions that we have been
1572 putting off. We need to loop in case one of the things emitted
1573 here references another one which comes earlier in the list. */
1577 for (i = 0; i < len; i++)
1581 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1584 /* Don't write out static consts, unless we still need them.
1586 We also keep static consts if not optimizing (for debugging),
1587 unless the user specified -fno-keep-static-consts.
1588 ??? They might be better written into the debug information.
1589 This is possible when using DWARF.
1591 A language processor that wants static constants to be always
1592 written out (even if it is not used) is responsible for
1593 calling rest_of_decl_compilation itself. E.g. the C front-end
1594 calls rest_of_decl_compilation from finish_decl.
1595 One motivation for this is that is conventional in some
1596 environments to write things like:
1597 static const char rcsid[] = "... version string ...";
1598 intending to force the string to be in the executable.
1600 A language processor that would prefer to have unneeded
1601 static constants "optimized away" would just defer writing
1602 them out until here. E.g. C++ does this, because static
1603 constants are often defined in header files.
1605 ??? A tempting alternative (for both C and C++) would be
1606 to force a constant to be written if and only if it is
1607 defined in a main file, as opposed to an include file. */
1609 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1613 if (flag_unit_at_a_time
1614 && cgraph_varpool_node (decl)->finalized)
1616 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1617 && (TREE_USED (decl)
1618 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1620 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1622 else if (DECL_COMDAT (decl))
1624 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1625 && (optimize || !flag_keep_static_consts
1626 || DECL_ARTIFICIAL (decl)))
1632 rest_of_decl_compilation (decl, NULL, 1, 1);
1636 if (TREE_CODE (decl) == FUNCTION_DECL
1637 && DECL_INITIAL (decl) != 0
1638 && DECL_SAVED_INSNS (decl) != 0
1639 && DECL_SAVED_INSNS (decl)->saved_for_inline
1640 && (flag_keep_inline_functions
1641 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1642 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1645 output_inline_function (decl);
1650 output_something = 1;
1654 return output_something;
1657 /* Issue appropriate warnings for the global declarations in VEC (of
1658 which there are LEN). Output debugging information for them. */
1661 check_global_declarations (tree *vec, int len)
1666 for (i = 0; i < len; i++)
1670 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1671 && ! TREE_ASM_WRITTEN (decl))
1672 /* Cancel the RTL for this decl so that, if debugging info
1673 output for global variables is still to come,
1674 this one will be omitted. */
1675 SET_DECL_RTL (decl, NULL_RTX);
1677 /* Warn about any function
1678 declared static but not defined.
1679 We don't warn about variables,
1680 because many programs have static variables
1681 that exist only to get some text into the object file. */
1682 if (TREE_CODE (decl) == FUNCTION_DECL
1683 && (warn_unused_function
1684 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1685 && DECL_INITIAL (decl) == 0
1686 && DECL_EXTERNAL (decl)
1687 && ! DECL_ARTIFICIAL (decl)
1688 && ! TREE_PUBLIC (decl))
1690 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1691 pedwarn ("%J'%F' used but never defined", decl, decl);
1693 warning ("%J'%F' declared `static' but never defined", decl, decl);
1694 /* This symbol is effectively an "extern" declaration now. */
1695 TREE_PUBLIC (decl) = 1;
1696 assemble_external (decl);
1699 /* Warn about static fns or vars defined but not used. */
1700 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1701 /* We don't warn about "static const" variables because the
1702 "rcs_id" idiom uses that construction. */
1703 || (warn_unused_variable
1704 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1705 && ! DECL_IN_SYSTEM_HEADER (decl)
1706 && ! TREE_USED (decl)
1707 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1708 to handle multiple external decls in different scopes. */
1709 && ! TREE_USED (DECL_NAME (decl))
1710 && ! DECL_EXTERNAL (decl)
1711 && ! TREE_PUBLIC (decl)
1712 /* A volatile variable might be used in some non-obvious way. */
1713 && ! TREE_THIS_VOLATILE (decl)
1714 /* Global register variables must be declared to reserve them. */
1715 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1716 /* Otherwise, ask the language. */
1717 && (*lang_hooks.decls.warn_unused_global) (decl))
1718 warning ("%J'%D' defined but not used", decl, decl);
1720 /* Avoid confusing the debug information machinery when there are
1722 if (errorcount == 0 && sorrycount == 0)
1724 timevar_push (TV_SYMOUT);
1725 (*debug_hooks->global_decl) (decl);
1726 timevar_pop (TV_SYMOUT);
1731 /* Warn about a use of an identifier which was marked deprecated. */
1733 warn_deprecated_use (tree node)
1735 if (node == 0 || !warn_deprecated_decl)
1739 warning ("`%s' is deprecated (declared at %s:%d)",
1740 IDENTIFIER_POINTER (DECL_NAME (node)),
1741 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1742 else if (TYPE_P (node))
1744 const char *what = NULL;
1745 tree decl = TYPE_STUB_DECL (node);
1747 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1748 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1749 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1750 && DECL_NAME (TYPE_NAME (node)))
1751 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1756 warning ("`%s' is deprecated (declared at %s:%d)", what,
1757 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1759 warning ("`%s' is deprecated", what);
1762 warning ("type is deprecated (declared at %s:%d)",
1763 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1765 warning ("type is deprecated");
1769 /* Save the current INPUT_LOCATION on the top entry in the
1770 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1771 INPUT_LOCATION accordingly. */
1774 push_srcloc (const char *file, int line)
1776 struct file_stack *fs;
1778 fs = xmalloc (sizeof (struct file_stack));
1779 fs->location = input_location;
1780 fs->next = input_file_stack;
1781 input_filename = file;
1783 input_file_stack = fs;
1784 input_file_stack_tick++;
1787 /* Pop the top entry off the stack of presently open source files.
1788 Restore the INPUT_LOCATION from the new topmost entry on the
1794 struct file_stack *fs;
1796 fs = input_file_stack;
1797 input_location = fs->location;
1798 input_file_stack = fs->next;
1800 input_file_stack_tick++;
1803 /* Compile an entire translation unit. Write a file of assembly
1804 output and various debugging dumps. */
1809 /* Initialize yet another pass. */
1811 init_final (main_input_filename);
1812 coverage_init (aux_base_name);
1814 timevar_push (TV_PARSE);
1816 /* Call the parser, which parses the entire file (calling
1817 rest_of_compilation for each function). */
1818 (*lang_hooks.parse_file) (set_yydebug);
1820 /* In case there were missing block closers,
1821 get us back to the global binding level. */
1822 (*lang_hooks.clear_binding_stack) ();
1824 /* Compilation is now finished except for writing
1825 what's left of the symbol table output. */
1826 timevar_pop (TV_PARSE);
1828 if (flag_syntax_only)
1831 (*lang_hooks.decls.final_write_globals)();
1833 cgraph_varpool_assemble_pending_decls ();
1835 /* This must occur after the loop to output deferred functions.
1836 Else the coverage initializer would not be emitted if all the
1837 functions in this compilation unit were deferred. */
1840 /* Write out any pending weak symbol declarations. */
1844 /* Do dbx symbols. */
1845 timevar_push (TV_SYMOUT);
1847 #ifdef DWARF2_UNWIND_INFO
1848 if (dwarf2out_do_frame ())
1849 dwarf2out_frame_finish ();
1852 (*debug_hooks->finish) (main_input_filename);
1853 timevar_pop (TV_SYMOUT);
1855 /* Output some stuff at end of file if nec. */
1857 dw2_output_indirect_constants ();
1859 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1861 timevar_push (TV_DUMP);
1862 open_dump_file (DFI_bp, NULL);
1866 close_dump_file (DFI_bp, NULL, NULL_RTX);
1867 timevar_pop (TV_DUMP);
1870 targetm.asm_out.file_end ();
1872 /* Attach a special .ident directive to the end of the file to identify
1873 the version of GCC which compiled this code. The format of the .ident
1874 string is patterned after the ones produced by native SVR4 compilers. */
1877 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1878 IDENT_ASM_OP, version_string);
1881 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1883 timevar_push (TV_DUMP);
1884 dump_combine_total_stats (rtl_dump_file);
1885 close_dump_file (DFI_combine, NULL, NULL_RTX);
1886 timevar_pop (TV_DUMP);
1890 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1891 and TYPE_DECL nodes.
1893 This does nothing for local (non-static) variables, unless the
1894 variable is a register variable with an ASMSPEC. In that case, or
1895 if the variable is not an automatic, it sets up the RTL and
1896 outputs any assembler code (label definition, storage allocation
1897 and initialization).
1899 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1900 the assembler symbol name to be used. TOP_LEVEL is nonzero
1901 if this declaration is not within a function. */
1904 rest_of_decl_compilation (tree decl,
1905 const char *asmspec,
1909 /* We deferred calling assemble_alias so that we could collect
1910 other attributes such as visibility. Emit the alias now. */
1913 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1916 alias = TREE_VALUE (TREE_VALUE (alias));
1917 alias = get_identifier (TREE_STRING_POINTER (alias));
1918 assemble_alias (decl, alias);
1922 /* Forward declarations for nested functions are not "external",
1923 but we need to treat them as if they were. */
1924 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1925 || TREE_CODE (decl) == FUNCTION_DECL)
1927 timevar_push (TV_VARCONST);
1930 make_decl_rtl (decl, asmspec);
1932 /* Don't output anything when a tentative file-scope definition
1933 is seen. But at end of compilation, do output code for them. */
1934 if ((at_end || !DECL_DEFER_OUTPUT (decl)) && !DECL_EXTERNAL (decl))
1936 if (flag_unit_at_a_time && !cgraph_global_info_ready
1937 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1938 cgraph_varpool_finalize_decl (decl);
1940 assemble_variable (decl, top_level, at_end, 0);
1943 #ifdef ASM_FINISH_DECLARE_OBJECT
1944 if (decl == last_assemble_variable_decl)
1946 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1951 timevar_pop (TV_VARCONST);
1953 else if (DECL_REGISTER (decl) && asmspec != 0)
1955 if (decode_reg_name (asmspec) >= 0)
1957 SET_DECL_RTL (decl, NULL_RTX);
1958 make_decl_rtl (decl, asmspec);
1962 error ("invalid register name `%s' for register variable", asmspec);
1963 DECL_REGISTER (decl) = 0;
1968 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1969 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1970 && TREE_CODE (decl) == TYPE_DECL)
1972 timevar_push (TV_SYMOUT);
1973 dbxout_symbol (decl, 0);
1974 timevar_pop (TV_SYMOUT);
1977 #ifdef SDB_DEBUGGING_INFO
1978 else if (write_symbols == SDB_DEBUG && top_level
1979 && TREE_CODE (decl) == TYPE_DECL)
1981 timevar_push (TV_SYMOUT);
1982 sdbout_symbol (decl, 0);
1983 timevar_pop (TV_SYMOUT);
1986 #ifdef DWARF2_DEBUGGING_INFO
1987 else if ((write_symbols == DWARF2_DEBUG
1988 || write_symbols == VMS_AND_DWARF2_DEBUG)
1990 && TREE_CODE (decl) == TYPE_DECL)
1992 timevar_push (TV_SYMOUT);
1993 dwarf2out_decl (decl);
1994 timevar_pop (TV_SYMOUT);
1999 /* Called after finishing a record, union or enumeral type. */
2002 rest_of_type_compilation (
2003 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2004 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2008 tree type ATTRIBUTE_UNUSED,
2009 int toplev ATTRIBUTE_UNUSED
2013 /* Avoid confusing the debug information machinery when there are
2015 if (errorcount != 0 || sorrycount != 0)
2018 timevar_push (TV_SYMOUT);
2019 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2020 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2021 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2023 #ifdef SDB_DEBUGGING_INFO
2024 if (write_symbols == SDB_DEBUG)
2025 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2027 #ifdef DWARF2_DEBUGGING_INFO
2028 if ((write_symbols == DWARF2_DEBUG
2029 || write_symbols == VMS_AND_DWARF2_DEBUG)
2031 dwarf2out_decl (TYPE_STUB_DECL (type));
2033 timevar_pop (TV_SYMOUT);
2036 /* Turn the RTL into assembly. */
2038 rest_of_handle_final (tree decl, rtx insns)
2040 timevar_push (TV_FINAL);
2045 /* Get the function's name, as described by its RTL. This may be
2046 different from the DECL_NAME name used in the source file. */
2048 x = DECL_RTL (decl);
2049 if (GET_CODE (x) != MEM)
2052 if (GET_CODE (x) != SYMBOL_REF)
2054 fnname = XSTR (x, 0);
2056 assemble_start_function (decl, fnname);
2057 final_start_function (insns, asm_out_file, optimize);
2058 final (insns, asm_out_file, optimize, 0);
2059 final_end_function ();
2061 #ifdef IA64_UNWIND_INFO
2062 /* ??? The IA-64 ".handlerdata" directive must be issued before
2063 the ".endp" directive that closes the procedure descriptor. */
2064 output_function_exception_table ();
2067 assemble_end_function (decl, fnname);
2069 #ifndef IA64_UNWIND_INFO
2070 /* Otherwise, it feels unclean to switch sections in the middle. */
2071 output_function_exception_table ();
2075 fflush (asm_out_file);
2077 /* Release all memory allocated by flow. */
2078 free_basic_block_vars (0);
2080 /* Release all memory held by regsets now. */
2081 regset_release_memory ();
2083 timevar_pop (TV_FINAL);
2089 /* Run delay slot optimization. */
2091 rest_of_handle_delay_slots (tree decl, rtx insns)
2093 timevar_push (TV_DBR_SCHED);
2094 open_dump_file (DFI_dbr, decl);
2096 dbr_schedule (insns, rtl_dump_file);
2098 close_dump_file (DFI_dbr, print_rtl, insns);
2099 timevar_pop (TV_DBR_SCHED);
2106 /* Convert register usage from flat register file usage to a stack
2109 rest_of_handle_stack_regs (tree decl, rtx insns)
2111 #if defined (HAVE_ATTR_length)
2112 /* If flow2 creates new instructions which need splitting
2113 and scheduling after reload is not done, they might not be
2114 splitten until final which doesn't allow splitting
2115 if HAVE_ATTR_length. */
2116 #ifdef INSN_SCHEDULING
2117 if (optimize && !flag_schedule_insns_after_reload)
2122 timevar_push (TV_SHORTEN_BRANCH);
2123 split_all_insns (1);
2124 timevar_pop (TV_SHORTEN_BRANCH);
2128 timevar_push (TV_REG_STACK);
2129 open_dump_file (DFI_stack, decl);
2131 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2133 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2134 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2135 && flag_reorder_blocks)
2137 reorder_basic_blocks ();
2138 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2142 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2143 timevar_pop (TV_REG_STACK);
2150 /* Machine independent reorg pass. */
2152 rest_of_handle_machine_reorg (tree decl, rtx insns)
2154 timevar_push (TV_MACH_DEP);
2155 open_dump_file (DFI_mach, decl);
2157 (*targetm.machine_dependent_reorg) ();
2159 close_dump_file (DFI_mach, print_rtl, insns);
2160 timevar_pop (TV_MACH_DEP);
2166 /* Run new register allocator. Return TRUE if we must exit
2167 rest_of_compilation upon return. */
2169 rest_of_handle_new_regalloc (tree decl, rtx insns)
2173 delete_trivially_dead_insns (insns, max_reg_num ());
2176 timevar_pop (TV_LOCAL_ALLOC);
2177 if (dump_file[DFI_lreg].enabled)
2179 timevar_push (TV_DUMP);
2181 close_dump_file (DFI_lreg, NULL, NULL);
2182 timevar_pop (TV_DUMP);
2185 /* XXX clean up the whole mess to bring live info in shape again. */
2186 timevar_push (TV_GLOBAL_ALLOC);
2187 open_dump_file (DFI_greg, decl);
2189 build_insn_chain (insns);
2190 failure = reload (insns, 0);
2192 timevar_pop (TV_GLOBAL_ALLOC);
2194 if (dump_file[DFI_greg].enabled)
2196 timevar_push (TV_DUMP);
2198 dump_global_regs (rtl_dump_file);
2200 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2201 timevar_pop (TV_DUMP);
2207 reload_completed = 1;
2212 /* Run old register allocator. Return TRUE if we must exit
2213 rest_of_compilation upon return. */
2215 rest_of_handle_old_regalloc (tree decl, rtx insns)
2220 /* Allocate the reg_renumber array. */
2221 allocate_reg_info (max_regno, FALSE, TRUE);
2223 /* And the reg_equiv_memory_loc array. */
2224 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2226 allocate_initial_values (reg_equiv_memory_loc);
2228 regclass (insns, max_reg_num (), rtl_dump_file);
2229 rebuild_notes = local_alloc ();
2231 timevar_pop (TV_LOCAL_ALLOC);
2233 /* Local allocation may have turned an indirect jump into a direct
2234 jump. If so, we must rebuild the JUMP_LABEL fields of jumping
2238 timevar_push (TV_JUMP);
2240 rebuild_jump_labels (insns);
2241 purge_all_dead_edges (0);
2243 timevar_pop (TV_JUMP);
2246 if (dump_file[DFI_lreg].enabled)
2248 timevar_push (TV_DUMP);
2250 dump_flow_info (rtl_dump_file);
2251 dump_local_alloc (rtl_dump_file);
2253 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2254 timevar_pop (TV_DUMP);
2259 timevar_push (TV_GLOBAL_ALLOC);
2260 open_dump_file (DFI_greg, decl);
2262 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2263 pass fixing up any insns that are invalid. */
2266 failure = global_alloc (rtl_dump_file);
2269 build_insn_chain (insns);
2270 failure = reload (insns, 0);
2273 timevar_pop (TV_GLOBAL_ALLOC);
2275 if (dump_file[DFI_greg].enabled)
2277 timevar_push (TV_DUMP);
2279 dump_global_regs (rtl_dump_file);
2281 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2282 timevar_pop (TV_DUMP);
2288 /* Run the regrename and cprop passes. */
2290 rest_of_handle_regrename (tree decl, rtx insns)
2292 timevar_push (TV_RENAME_REGISTERS);
2293 open_dump_file (DFI_rnreg, decl);
2295 if (flag_rename_registers)
2296 regrename_optimize ();
2297 if (flag_cprop_registers)
2298 copyprop_hardreg_forward ();
2300 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2301 timevar_pop (TV_RENAME_REGISTERS);
2304 /* Reorder basic blocks. */
2306 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2308 timevar_push (TV_REORDER_BLOCKS);
2309 open_dump_file (DFI_bbro, decl);
2311 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2312 splitting possibly introduced more crossjumping opportunities. */
2313 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2314 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2316 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2318 if (flag_reorder_blocks)
2319 reorder_basic_blocks ();
2320 if (flag_reorder_blocks
2321 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2322 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2324 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2325 timevar_pop (TV_REORDER_BLOCKS);
2328 #ifdef INSN_SCHEDULING
2329 /* Run instruction scheduler. */
2331 rest_of_handle_sched (tree decl, rtx insns)
2333 timevar_push (TV_SCHED);
2335 /* Print function header into sched dump now
2336 because doing the sched analysis makes some of the dump. */
2337 if (optimize > 0 && flag_schedule_insns)
2339 open_dump_file (DFI_sched, decl);
2341 /* Do control and data sched analysis,
2342 and write some of the results to dump file. */
2344 schedule_insns (rtl_dump_file);
2346 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2348 timevar_pop (TV_SCHED);
2353 /* Run second scheduling pass after reload. */
2355 rest_of_handle_sched2 (tree decl, rtx insns)
2357 timevar_push (TV_SCHED2);
2358 open_dump_file (DFI_sched2, decl);
2360 /* Do control and data sched analysis again,
2361 and write some more of the results to dump file. */
2363 split_all_insns (1);
2365 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2367 schedule_ebbs (rtl_dump_file);
2368 /* No liveness updating code yet, but it should be easy to do.
2369 reg-stack recompute the liveness when needed for now. */
2370 count_or_remove_death_notes (NULL, 1);
2371 cleanup_cfg (CLEANUP_EXPENSIVE);
2374 schedule_insns (rtl_dump_file);
2376 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2377 timevar_pop (TV_SCHED2);
2383 /* Register allocation pre-pass, to reduce number of moves necessary
2384 for two-address machines. */
2386 rest_of_handle_regmove (tree decl, rtx insns)
2388 timevar_push (TV_REGMOVE);
2389 open_dump_file (DFI_regmove, decl);
2391 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2393 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2394 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2395 timevar_pop (TV_REGMOVE);
2402 rest_of_handle_tracer (tree decl, rtx insns)
2404 timevar_push (TV_TRACER);
2405 open_dump_file (DFI_tracer, decl);
2407 dump_flow_info (rtl_dump_file);
2409 cleanup_cfg (CLEANUP_EXPENSIVE);
2410 reg_scan (insns, max_reg_num (), 0);
2411 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2412 timevar_pop (TV_TRACER);
2415 /* If-conversion and CFG cleanup. */
2417 rest_of_handle_if_conversion (tree decl, rtx insns)
2419 open_dump_file (DFI_ce1, decl);
2420 if (flag_if_conversion)
2422 timevar_push (TV_IFCVT);
2424 dump_flow_info (rtl_dump_file);
2425 cleanup_cfg (CLEANUP_EXPENSIVE);
2426 reg_scan (insns, max_reg_num (), 0);
2428 timevar_pop (TV_IFCVT);
2430 timevar_push (TV_JUMP);
2431 cleanup_cfg (CLEANUP_EXPENSIVE);
2432 reg_scan (insns, max_reg_num (), 0);
2433 timevar_pop (TV_JUMP);
2434 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2437 /* Rerun if-conversion, as combine may have simplified things enough
2438 to now meet sequence length restrictions. */
2440 rest_of_handle_if_after_combine (tree decl, rtx insns)
2442 timevar_push (TV_IFCVT);
2443 open_dump_file (DFI_ce2, decl);
2449 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2450 timevar_pop (TV_IFCVT);
2454 rest_of_handle_web (tree decl, rtx insns)
2456 open_dump_file (DFI_web, decl);
2457 timevar_push (TV_WEB);
2459 delete_trivially_dead_insns (insns, max_reg_num ());
2460 cleanup_cfg (CLEANUP_EXPENSIVE);
2462 timevar_pop (TV_WEB);
2463 close_dump_file (DFI_web, print_rtl_with_bb, insns);
2464 reg_scan (get_insns (), max_reg_num (), 0);
2467 /* Do branch profiling and static profile estimation passes. */
2469 rest_of_handle_branch_prob (tree decl, rtx insns)
2473 timevar_push (TV_BRANCH_PROB);
2474 open_dump_file (DFI_bp, decl);
2476 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2479 /* Discover and record the loop depth at the head of each basic
2480 block. The loop infrastructure does the real job for us. */
2481 flow_loops_find (&loops, LOOP_TREE);
2484 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2486 /* Estimate using heuristics if no profiling info is available. */
2487 if (flag_guess_branch_prob)
2488 estimate_probability (&loops);
2490 flow_loops_free (&loops);
2491 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2492 timevar_pop (TV_BRANCH_PROB);
2495 /* Do optimizations based on expression value profiles. */
2497 rest_of_handle_value_profile_transformations (tree decl, rtx insns)
2499 open_dump_file (DFI_vpt, decl);
2500 timevar_push (TV_VPT);
2502 if (value_profile_transformations ())
2503 cleanup_cfg (CLEANUP_EXPENSIVE);
2505 timevar_pop (TV_VPT);
2506 close_dump_file (DFI_vpt, print_rtl_with_bb, insns);
2509 /* Do control and data flow analysis; write some of the results to the
2512 rest_of_handle_cfg (tree decl, rtx insns)
2514 open_dump_file (DFI_cfg, decl);
2516 dump_flow_info (rtl_dump_file);
2518 cleanup_cfg (CLEANUP_EXPENSIVE
2519 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2521 /* It may make more sense to mark constant functions after dead code is
2522 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2523 may insert code making function non-constant, but we still must consider
2524 it as constant, otherwise -fbranch-probabilities will not read data back.
2526 life_analysis rarely eliminates modification of external memory.
2529 mark_constant_function ();
2531 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2534 /* Purge addressofs. */
2536 rest_of_handle_addressof (tree decl, rtx insns)
2538 open_dump_file (DFI_addressof, decl);
2540 purge_addressof (insns);
2541 if (optimize && purge_all_dead_edges (0))
2542 delete_unreachable_blocks ();
2543 reg_scan (insns, max_reg_num (), 1);
2545 close_dump_file (DFI_addressof, print_rtl, insns);
2548 /* We may have potential sibling or tail recursion sites. Select one
2549 (of possibly multiple) methods of performing the call. */
2551 rest_of_handle_sibling_calls (rtx insns)
2554 optimize_sibling_and_tail_recursive_calls ();
2556 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2557 free_bb_for_insn ();
2558 find_exception_handler_labels ();
2559 rebuild_jump_labels (insns);
2560 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2562 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2563 notes before simplifying cfg and we must do lowering after sibcall
2564 that unhides parts of RTL chain and cleans up the CFG.
2566 Until sibcall is replaced by tree-level optimizer, lets just
2567 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2568 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2569 if (GET_CODE (insn) == NOTE
2570 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2573 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2576 /* Perform jump bypassing and control flow optimizations. */
2578 rest_of_handle_jump_bypass (tree decl, rtx insns)
2580 timevar_push (TV_BYPASS);
2581 open_dump_file (DFI_bypass, decl);
2583 cleanup_cfg (CLEANUP_EXPENSIVE);
2585 if (bypass_jumps (rtl_dump_file))
2587 rebuild_jump_labels (insns);
2588 cleanup_cfg (CLEANUP_EXPENSIVE);
2589 delete_trivially_dead_insns (insns, max_reg_num ());
2592 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2593 timevar_pop (TV_BYPASS);
2597 #ifdef ENABLE_CHECKING
2598 verify_flow_info ();
2602 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2603 if we must exit rest_of_compilation upon return. */
2605 rest_of_handle_inlining (tree decl)
2612 /* If we are reconsidering an inline function at the end of
2613 compilation, skip the stuff for making it inline. */
2614 if (cfun->rtl_inline_init)
2616 cfun->rtl_inline_init = 1;
2618 /* If this is nested inside an inlined external function, pretend
2619 it was only declared. Since we cannot inline such functions,
2620 generating code for this one is not only not necessary but will
2621 confuse some debugging output writers. */
2622 for (parent = DECL_CONTEXT (current_function_decl);
2623 parent != NULL_TREE;
2624 parent = get_containing_scope (parent))
2625 if (TREE_CODE (parent) == FUNCTION_DECL
2626 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2628 DECL_INITIAL (decl) = 0;
2631 else if (TYPE_P (parent))
2632 /* A function in a local class should be treated normally. */
2635 /* If requested, consider whether to make this function inline. */
2636 if ((DECL_INLINE (decl) && !flag_no_inline)
2637 || flag_inline_functions)
2639 timevar_push (TV_INTEGRATION);
2640 lose = function_cannot_inline_p (decl);
2641 timevar_pop (TV_INTEGRATION);
2642 if (lose || ! optimize)
2644 if (warn_inline && lose && DECL_INLINE (decl))
2646 char *msg = concat ("%J", lose, NULL);
2647 warning (msg, decl);
2650 DECL_ABSTRACT_ORIGIN (decl) = 0;
2651 /* Don't really compile an extern inline function.
2652 If we can't make it inline, pretend
2653 it was only declared. */
2654 if (DECL_EXTERNAL (decl))
2656 DECL_INITIAL (decl) = 0;
2661 inlinable = DECL_INLINE (decl) = 1;
2664 insns = get_insns ();
2666 /* Dump the rtl code if we are dumping rtl. */
2668 if (open_dump_file (DFI_rtl, decl))
2670 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2671 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2672 close_dump_file (DFI_rtl, print_rtl, insns);
2675 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2676 sorts of eh initialization. Delay this until after the
2677 initial rtl dump so that we can see the original nesting. */
2678 convert_from_eh_region_ranges ();
2680 /* If function is inline, and we don't yet know whether to
2681 compile it by itself, defer decision till end of compilation.
2682 wrapup_global_declarations will (indirectly) call
2683 rest_of_compilation again for those functions that need to
2684 be output. Also defer those functions that we are supposed
2688 || (DECL_INLINE (decl)
2689 && flag_inline_functions
2690 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2691 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2692 && ! flag_keep_inline_functions)
2693 || DECL_EXTERNAL (decl))))
2694 DECL_DEFER_OUTPUT (decl) = 1;
2696 if (DECL_INLINE (decl))
2697 /* DWARF wants separate debugging info for abstract and
2698 concrete instances of all inline functions, including those
2699 declared inline but not inlined, and those inlined even
2700 though they weren't declared inline. Conveniently, that's
2701 what DECL_INLINE means at this point. */
2702 (*debug_hooks->deferred_inline_function) (decl);
2704 if (DECL_DEFER_OUTPUT (decl))
2706 /* If -Wreturn-type, we have to do a bit of compilation. We just
2707 want to call cleanup the cfg to figure out whether or not we can
2708 fall off the end of the function; we do the minimum amount of
2709 work necessary to make that safe. */
2710 if (warn_return_type)
2712 int saved_optimize = optimize;
2715 rebuild_jump_labels (insns);
2716 find_exception_handler_labels ();
2717 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2718 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2719 optimize = saved_optimize;
2721 /* CFG is no longer maintained up-to-date. */
2722 free_bb_for_insn ();
2725 set_nothrow_function_flags ();
2726 if (current_function_nothrow)
2727 /* Now we know that this can't throw; set the flag for the benefit
2728 of other functions later in this translation unit. */
2729 TREE_NOTHROW (current_function_decl) = 1;
2731 timevar_push (TV_INTEGRATION);
2732 save_for_inline (decl);
2733 timevar_pop (TV_INTEGRATION);
2734 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2738 /* If specified extern inline but we aren't inlining it, we are
2739 done. This goes for anything that gets here with DECL_EXTERNAL
2740 set, not just things with DECL_INLINE. */
2741 return (bool) DECL_EXTERNAL (decl);
2744 /* Try to identify useless null pointer tests and delete them. */
2746 rest_of_handle_null_pointer (tree decl, rtx insns)
2748 open_dump_file (DFI_null, decl);
2750 dump_flow_info (rtl_dump_file);
2752 if (delete_null_pointer_checks (insns))
2753 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2755 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2758 /* Try combining insns through substitution. */
2760 rest_of_handle_combine (tree decl, rtx insns)
2762 int rebuild_jump_labels_after_combine = 0;
2764 timevar_push (TV_COMBINE);
2765 open_dump_file (DFI_combine, decl);
2767 rebuild_jump_labels_after_combine
2768 = combine_instructions (insns, max_reg_num ());
2770 /* Combining insns may have turned an indirect jump into a
2771 direct jump. Rebuild the JUMP_LABEL fields of jumping
2773 if (rebuild_jump_labels_after_combine)
2775 timevar_push (TV_JUMP);
2776 rebuild_jump_labels (insns);
2777 timevar_pop (TV_JUMP);
2779 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2782 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2783 timevar_pop (TV_COMBINE);
2788 /* Perform life analysis. */
2790 rest_of_handle_life (tree decl, rtx insns)
2792 open_dump_file (DFI_life, decl);
2795 #ifdef ENABLE_CHECKING
2796 verify_flow_info ();
2798 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2800 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2801 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2802 timevar_pop (TV_FLOW);
2804 if (warn_uninitialized)
2806 uninitialized_vars_warning (DECL_INITIAL (decl));
2808 setjmp_args_warning ();
2813 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2815 /* Insns were inserted, and possibly pseudos created, so
2816 things might look a bit different. */
2817 insns = get_insns ();
2818 allocate_reg_life_data ();
2819 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2820 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2826 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2831 /* Perform common subexpression elimination. Nonzero value from
2832 `cse_main' means that jumps were simplified and some code may now
2833 be unreachable, so do jump optimization again. */
2835 rest_of_handle_cse (tree decl, rtx insns)
2839 open_dump_file (DFI_cse, decl);
2841 dump_flow_info (rtl_dump_file);
2842 timevar_push (TV_CSE);
2844 reg_scan (insns, max_reg_num (), 1);
2846 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2848 rebuild_jump_labels (insns);
2849 if (purge_all_dead_edges (0))
2850 delete_unreachable_blocks ();
2852 delete_trivially_dead_insns (insns, max_reg_num ());
2854 /* If we are not running more CSE passes, then we are no longer
2855 expecting CSE to be run. But always rerun it in a cheap mode. */
2856 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2858 if (tem || optimize > 1)
2859 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2860 /* Try to identify useless null pointer tests and delete them. */
2861 if (flag_delete_null_pointer_checks)
2863 timevar_push (TV_JUMP);
2865 if (delete_null_pointer_checks (insns))
2866 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2867 timevar_pop (TV_JUMP);
2870 /* The second pass of jump optimization is likely to have
2871 removed a bunch more instructions. */
2872 renumber_insns (rtl_dump_file);
2874 timevar_pop (TV_CSE);
2875 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2878 /* Run second CSE pass after loop optimizations. */
2880 rest_of_handle_cse2 (tree decl, rtx insns)
2884 timevar_push (TV_CSE2);
2885 open_dump_file (DFI_cse2, decl);
2887 dump_flow_info (rtl_dump_file);
2888 /* CFG is no longer maintained up-to-date. */
2889 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2890 purge_all_dead_edges (0);
2891 delete_trivially_dead_insns (insns, max_reg_num ());
2895 timevar_push (TV_JUMP);
2896 rebuild_jump_labels (insns);
2897 cleanup_cfg (CLEANUP_EXPENSIVE);
2898 timevar_pop (TV_JUMP);
2900 reg_scan (insns, max_reg_num (), 0);
2901 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2903 timevar_pop (TV_CSE2);
2906 /* Perform global cse. */
2908 rest_of_handle_gcse (tree decl, rtx insns)
2910 int save_csb, save_cfj;
2913 timevar_push (TV_GCSE);
2914 open_dump_file (DFI_gcse, decl);
2916 tem = gcse_main (insns, rtl_dump_file);
2917 rebuild_jump_labels (insns);
2918 delete_trivially_dead_insns (insns, max_reg_num ());
2920 save_csb = flag_cse_skip_blocks;
2921 save_cfj = flag_cse_follow_jumps;
2922 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2924 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2925 if (current_function_calls_constant_p)
2926 purge_builtin_constant_p ();
2928 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2930 if (flag_expensive_optimizations)
2932 timevar_push (TV_CSE);
2933 reg_scan (insns, max_reg_num (), 1);
2934 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2935 purge_all_dead_edges (0);
2936 delete_trivially_dead_insns (insns, max_reg_num ());
2937 timevar_pop (TV_CSE);
2938 cse_not_expected = !flag_rerun_cse_after_loop;
2941 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2942 things up. Then possibly re-run CSE again. */
2946 timevar_push (TV_JUMP);
2947 rebuild_jump_labels (insns);
2948 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2949 timevar_pop (TV_JUMP);
2951 if (flag_expensive_optimizations)
2953 timevar_push (TV_CSE);
2954 reg_scan (insns, max_reg_num (), 1);
2955 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2956 purge_all_dead_edges (0);
2957 delete_trivially_dead_insns (insns, max_reg_num ());
2958 timevar_pop (TV_CSE);
2962 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2963 timevar_pop (TV_GCSE);
2966 flag_cse_skip_blocks = save_csb;
2967 flag_cse_follow_jumps = save_cfj;
2968 #ifdef ENABLE_CHECKING
2969 verify_flow_info ();
2973 /* Move constant computations out of loops. */
2975 rest_of_handle_loop_optimize (tree decl, rtx insns)
2977 int do_unroll, do_prefetch;
2979 timevar_push (TV_LOOP);
2980 delete_dead_jumptables ();
2981 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2982 open_dump_file (DFI_loop, decl);
2984 /* CFG is no longer maintained up-to-date. */
2985 free_bb_for_insn ();
2987 if (flag_unroll_loops)
2988 do_unroll = 0; /* Having two unrollers is useless. */
2990 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2991 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2993 if (flag_rerun_loop_opt)
2995 cleanup_barriers ();
2997 /* We only want to perform unrolling once. */
2998 loop_optimize (insns, rtl_dump_file, do_unroll);
3001 /* The first call to loop_optimize makes some instructions
3002 trivially dead. We delete those instructions now in the
3003 hope that doing so will make the heuristics in loop work
3004 better and possibly speed up compilation. */
3005 delete_trivially_dead_insns (insns, max_reg_num ());
3007 /* The regscan pass is currently necessary as the alias
3008 analysis code depends on this information. */
3009 reg_scan (insns, max_reg_num (), 1);
3011 cleanup_barriers ();
3012 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3014 /* Loop can create trivially dead instructions. */
3015 delete_trivially_dead_insns (insns, max_reg_num ());
3016 close_dump_file (DFI_loop, print_rtl, insns);
3017 timevar_pop (TV_LOOP);
3018 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3023 /* Perform loop optimizations. It might be better to do them a bit
3024 sooner, but we want the profile feedback to work more
3027 rest_of_handle_loop2 (tree decl, rtx insns)
3029 struct loops *loops;
3030 timevar_push (TV_LOOP);
3031 open_dump_file (DFI_loop2, decl);
3033 dump_flow_info (rtl_dump_file);
3035 loops = loop_optimizer_init (rtl_dump_file);
3039 /* The optimizations: */
3040 if (flag_unswitch_loops)
3041 unswitch_loops (loops);
3043 if (flag_peel_loops || flag_unroll_loops)
3044 unroll_and_peel_loops (loops,
3045 (flag_peel_loops ? UAP_PEEL : 0) |
3046 (flag_unroll_loops ? UAP_UNROLL : 0) |
3047 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3049 loop_optimizer_finalize (loops, rtl_dump_file);
3052 cleanup_cfg (CLEANUP_EXPENSIVE);
3053 delete_trivially_dead_insns (insns, max_reg_num ());
3054 reg_scan (insns, max_reg_num (), 0);
3056 dump_flow_info (rtl_dump_file);
3057 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3058 timevar_pop (TV_LOOP);
3062 /* This is called from finish_function (within langhooks.parse_file)
3063 after each top-level definition is parsed.
3064 It is supposed to compile that function or variable
3065 and output the assembler code for it.
3066 After we return, the tree storage is freed. */
3069 rest_of_compilation (tree decl)
3073 timevar_push (TV_REST_OF_COMPILATION);
3075 /* Register rtl specific functions for cfg. */
3076 rtl_register_cfg_hooks ();
3078 /* Now that we're out of the frontend, we shouldn't have any more
3079 CONCATs anywhere. */
3080 generating_concat_p = 0;
3082 /* When processing delayed functions, prepare_function_start() won't
3083 have been run to re-initialize it. */
3084 cse_not_expected = ! optimize;
3086 /* First, make sure that NOTE_BLOCK is set correctly for each
3087 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3088 if (!cfun->x_whole_function_mode_p)
3091 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3092 tree in sensible shape. So, we just recalculate it here. */
3093 if (cfun->x_whole_function_mode_p)
3098 if (rest_of_handle_inlining (decl))
3099 goto exit_rest_of_compilation;
3101 /* If we're emitting a nested function, make sure its parent gets
3102 emitted as well. Doing otherwise confuses debug info. */
3105 for (parent = DECL_CONTEXT (current_function_decl);
3106 parent != NULL_TREE;
3107 parent = get_containing_scope (parent))
3108 if (TREE_CODE (parent) == FUNCTION_DECL)
3109 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3112 /* We are now committed to emitting code for this function. Do any
3113 preparation, such as emitting abstract debug info for the inline
3114 before it gets mangled by optimization. */
3115 if (cgraph_function_possibly_inlined_p (decl))
3116 (*debug_hooks->outlining_inline_function) (decl);
3118 /* Remove any notes we don't need. That will make iterating
3119 over the instruction sequence faster, and allow the garbage
3120 collector to reclaim the memory used by the notes. */
3121 remove_unnecessary_notes ();
3126 /* Initialize some variables used by the optimizers. */
3127 init_function_for_compilation ();
3129 if (! DECL_DEFER_OUTPUT (decl))
3130 TREE_ASM_WRITTEN (decl) = 1;
3132 /* Now that integrate will no longer see our rtl, we need not
3133 distinguish between the return value of this function and the
3134 return value of called functions. Also, we can remove all SETs
3135 of subregs of hard registers; they are only here because of
3136 integrate. Also, we can now initialize pseudos intended to
3137 carry magic hard reg data throughout the function. */
3138 rtx_equal_function_value_matters = 0;
3139 purge_hard_subreg_sets (get_insns ());
3141 /* Early return if there were errors. We can run afoul of our
3142 consistency checks, and there's not really much point in fixing them.
3143 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3144 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3145 || errorcount || sorrycount)
3146 goto exit_rest_of_compilation;
3148 timevar_push (TV_JUMP);
3149 open_dump_file (DFI_sibling, decl);
3150 insns = get_insns ();
3151 rebuild_jump_labels (insns);
3152 find_exception_handler_labels ();
3153 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3155 delete_unreachable_blocks ();
3157 /* We have to issue these warnings now already, because CFG cleanups
3158 further down may destroy the required information. */
3159 check_function_return_warnings ();
3161 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3162 if (flag_guess_branch_prob)
3164 timevar_push (TV_BRANCH_PROB);
3165 note_prediction_to_br_prob ();
3166 timevar_pop (TV_BRANCH_PROB);
3169 if (flag_optimize_sibling_calls)
3170 rest_of_handle_sibling_calls (insns);
3172 timevar_pop (TV_JUMP);
3174 insn_locators_initialize ();
3175 /* Complete generation of exception handling code. */
3178 timevar_push (TV_JUMP);
3179 open_dump_file (DFI_eh, decl);
3181 finish_eh_generation ();
3183 close_dump_file (DFI_eh, print_rtl, get_insns ());
3184 timevar_pop (TV_JUMP);
3187 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3188 generation, which might create new sets. */
3189 emit_initial_value_sets ();
3192 /* If we are doing position-independent code generation, now
3193 is the time to output special prologues and epilogues.
3194 We do not want to do this earlier, because it just clutters
3195 up inline functions with meaningless insns. */
3200 insns = get_insns ();
3202 /* Copy any shared structure that should not be shared. */
3203 unshare_all_rtl (current_function_decl, insns);
3205 #ifdef SETJMP_VIA_SAVE_AREA
3206 /* This must be performed before virtual register instantiation.
3207 Please be aware the everything in the compiler that can look
3208 at the RTL up to this point must understand that REG_SAVE_AREA
3209 is just like a use of the REG contained inside. */
3210 if (current_function_calls_alloca)
3211 optimize_save_area_alloca (insns);
3214 /* Instantiate all virtual registers. */
3215 instantiate_virtual_regs (current_function_decl, insns);
3217 open_dump_file (DFI_jump, decl);
3219 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3220 are initialized and to compute whether control can drop off the end
3223 timevar_push (TV_JUMP);
3224 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3225 before jump optimization switches branch directions. */
3226 if (flag_guess_branch_prob)
3227 expected_value_to_br_prob ();
3229 reg_scan (insns, max_reg_num (), 0);
3230 rebuild_jump_labels (insns);
3231 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3232 delete_trivially_dead_insns (insns, max_reg_num ());
3234 dump_flow_info (rtl_dump_file);
3235 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3236 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3240 free_bb_for_insn ();
3241 copy_loop_headers (insns);
3242 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3244 purge_line_number_notes (insns);
3246 timevar_pop (TV_JUMP);
3247 close_dump_file (DFI_jump, print_rtl, insns);
3249 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3250 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3251 goto exit_rest_of_compilation;
3253 timevar_push (TV_JUMP);
3256 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3258 if (flag_delete_null_pointer_checks)
3259 rest_of_handle_null_pointer (decl, insns);
3261 /* Jump optimization, and the removal of NULL pointer checks, may
3262 have reduced the number of instructions substantially. CSE, and
3263 future passes, allocate arrays whose dimensions involve the
3264 maximum instruction UID, so if we can reduce the maximum UID
3265 we'll save big on memory. */
3266 renumber_insns (rtl_dump_file);
3267 timevar_pop (TV_JUMP);
3269 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3274 rest_of_handle_cse (decl, insns);
3276 rest_of_handle_addressof (decl, insns);
3283 rest_of_handle_gcse (decl, insns);
3285 if (flag_loop_optimize)
3286 rest_of_handle_loop_optimize (decl, insns);
3289 rest_of_handle_jump_bypass (decl, insns);
3292 timevar_push (TV_FLOW);
3294 rest_of_handle_cfg (decl, insns);
3297 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3299 rest_of_handle_branch_prob (decl, insns);
3301 if (flag_branch_probabilities
3302 && flag_profile_values
3303 && flag_value_profile_transformations)
3304 rest_of_handle_value_profile_transformations (decl, insns);
3306 /* Remove the death notes created for vpt. */
3307 if (flag_profile_values)
3308 count_or_remove_death_notes (NULL, 1);
3312 rest_of_handle_if_conversion (decl, insns);
3315 rest_of_handle_tracer (decl, insns);
3318 && (flag_unswitch_loops
3320 || flag_unroll_loops))
3321 rest_of_handle_loop2 (decl, insns);
3324 rest_of_handle_web (decl, insns);
3326 if (flag_rerun_cse_after_loop)
3327 rest_of_handle_cse2 (decl, insns);
3329 cse_not_expected = 1;
3331 rest_of_handle_life (decl, insns);
3334 rest_of_handle_combine (decl, insns);
3336 if (flag_if_conversion)
3337 rest_of_handle_if_after_combine (decl, insns);
3339 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3340 rest_of_handle_regmove (decl, insns);
3342 /* Do unconditional splitting before register allocation to allow machine
3343 description to add extra information not needed previously. */
3344 split_all_insns (1);
3346 #ifdef OPTIMIZE_MODE_SWITCHING
3347 timevar_push (TV_MODE_SWITCH);
3350 optimize_mode_switching (NULL);
3353 timevar_pop (TV_MODE_SWITCH);
3356 /* Any of the several passes since flow1 will have munged register
3357 lifetime data a bit. We need it to be up to date for scheduling
3358 (see handling of reg_known_equiv in init_alias_analysis). */
3359 recompute_reg_usage (insns, !optimize_size);
3361 #ifdef INSN_SCHEDULING
3362 rest_of_handle_sched (decl, insns);
3365 /* Determine if the current function is a leaf before running reload
3366 since this can impact optimizations done by the prologue and
3367 epilogue thus changing register elimination offsets. */
3368 current_function_is_leaf = leaf_function_p ();
3370 timevar_push (TV_LOCAL_ALLOC);
3371 open_dump_file (DFI_lreg, decl);
3373 if (flag_new_regalloc)
3375 if (rest_of_handle_new_regalloc (decl, insns))
3376 goto exit_rest_of_compilation;
3380 if (rest_of_handle_old_regalloc (decl, insns))
3381 goto exit_rest_of_compilation;
3386 open_dump_file (DFI_postreload, decl);
3388 /* Do a very simple CSE pass over just the hard registers. */
3391 timevar_push (TV_RELOAD_CSE_REGS);
3392 reload_cse_regs (insns);
3393 timevar_pop (TV_RELOAD_CSE_REGS);
3396 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3398 /* Re-create the death notes which were deleted during reload. */
3399 timevar_push (TV_FLOW2);
3400 open_dump_file (DFI_flow2, decl);
3402 #ifdef ENABLE_CHECKING
3403 verify_flow_info ();
3406 /* If optimizing, then go ahead and split insns now. */
3410 split_all_insns (0);
3412 if (flag_branch_target_load_optimize)
3414 open_dump_file (DFI_branch_target_load, decl);
3416 branch_target_load_optimize (insns, false);
3418 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3424 cleanup_cfg (CLEANUP_EXPENSIVE);
3426 /* On some machines, the prologue and epilogue code, or parts thereof,
3427 can be represented as RTL. Doing so lets us schedule insns between
3428 it and the rest of the code and also allows delayed branch
3429 scheduling to operate in the epilogue. */
3430 thread_prologue_and_epilogue_insns (insns);
3431 epilogue_completed = 1;
3435 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3436 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3437 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3439 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3440 even for machines with possibly nonzero RETURN_POPS_ARGS
3441 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3442 push instructions will have popping returns. */
3443 #ifndef PUSH_ROUNDING
3444 if (!ACCUMULATE_OUTGOING_ARGS)
3446 combine_stack_adjustments ();
3451 flow2_completed = 1;
3453 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3454 timevar_pop (TV_FLOW2);
3456 #ifdef HAVE_peephole2
3457 if (optimize > 0 && flag_peephole2)
3459 timevar_push (TV_PEEPHOLE2);
3460 open_dump_file (DFI_peephole2, decl);
3462 peephole2_optimize (rtl_dump_file);
3464 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3465 timevar_pop (TV_PEEPHOLE2);
3471 if (flag_rename_registers || flag_cprop_registers)
3472 rest_of_handle_regrename (decl, insns);
3474 rest_of_handle_reorder_blocks (decl, insns);
3477 if (flag_if_conversion2)
3479 timevar_push (TV_IFCVT2);
3480 open_dump_file (DFI_ce3, decl);
3484 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3485 timevar_pop (TV_IFCVT2);
3488 if (flag_branch_target_load_optimize2)
3490 /* Leave this a warning for now so that it is possible to experiment
3491 with running this pass twice. In 3.6, we should either make this
3492 an error, or use separate dump files. */
3493 if (flag_branch_target_load_optimize)
3494 warning ("branch target register load optimization is not intended "
3497 open_dump_file (DFI_branch_target_load, decl);
3499 branch_target_load_optimize (insns, true);
3501 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3506 #ifdef INSN_SCHEDULING
3507 if (optimize > 0 && flag_schedule_insns_after_reload)
3508 rest_of_handle_sched2 (decl, insns);
3511 #ifdef LEAF_REGISTERS
3512 current_function_uses_only_leaf_regs
3513 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3517 rest_of_handle_stack_regs (decl, insns);
3520 compute_alignments ();
3522 /* CFG is no longer maintained up-to-date. */
3523 free_bb_for_insn ();
3525 if (targetm.machine_dependent_reorg != 0)
3526 rest_of_handle_machine_reorg (decl, insns);
3528 purge_line_number_notes (insns);
3529 cleanup_barriers ();
3532 if (optimize > 0 && flag_delayed_branch)
3533 rest_of_handle_delay_slots (decl, insns);
3536 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3537 timevar_push (TV_SHORTEN_BRANCH);
3538 split_all_insns_noflow ();
3539 timevar_pop (TV_SHORTEN_BRANCH);
3542 convert_to_eh_region_ranges ();
3544 /* Shorten branches. */
3545 timevar_push (TV_SHORTEN_BRANCH);
3546 shorten_branches (get_insns ());
3547 timevar_pop (TV_SHORTEN_BRANCH);
3549 set_nothrow_function_flags ();
3550 if (current_function_nothrow)
3551 /* Now we know that this can't throw; set the flag for the benefit
3552 of other functions later in this translation unit. */
3553 TREE_NOTHROW (current_function_decl) = 1;
3555 rest_of_handle_final (decl, insns);
3557 /* Write DBX symbols if requested. */
3559 /* Note that for those inline functions where we don't initially
3560 know for certain that we will be generating an out-of-line copy,
3561 the first invocation of this routine (rest_of_compilation) will
3562 skip over this code by doing a `goto exit_rest_of_compilation;'.
3563 Later on, wrapup_global_declarations will (indirectly) call
3564 rest_of_compilation again for those inline functions that need
3565 to have out-of-line copies generated. During that call, we
3566 *will* be routed past here. */
3568 timevar_push (TV_SYMOUT);
3569 (*debug_hooks->function_decl) (decl);
3570 timevar_pop (TV_SYMOUT);
3572 exit_rest_of_compilation:
3574 coverage_end_function ();
3576 /* In case the function was not output,
3577 don't leave any temporary anonymous types
3578 queued up for sdb output. */
3579 #ifdef SDB_DEBUGGING_INFO
3580 if (write_symbols == SDB_DEBUG)
3581 sdbout_types (NULL_TREE);
3584 reload_completed = 0;
3585 epilogue_completed = 0;
3586 flow2_completed = 0;
3589 timevar_push (TV_FINAL);
3591 /* Clear out the insn_length contents now that they are no
3593 init_insn_lengths ();
3595 /* Show no temporary slots allocated. */
3598 free_basic_block_vars (0);
3599 free_bb_for_insn ();
3601 timevar_pop (TV_FINAL);
3603 if ((*targetm.binds_local_p) (current_function_decl))
3605 int pref = cfun->preferred_stack_boundary;
3606 if (cfun->recursive_call_emit
3607 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3608 pref = cfun->stack_alignment_needed;
3609 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3613 /* Make sure volatile mem refs aren't considered valid operands for
3614 arithmetic insns. We must call this here if this is a nested inline
3615 function, since the above code leaves us in the init_recog state
3616 (from final.c), and the function context push/pop code does not
3617 save/restore volatile_ok.
3619 ??? Maybe it isn't necessary for expand_start_function to call this
3620 anymore if we do it here? */
3622 init_recog_no_volatile ();
3624 /* We're done with this function. Free up memory if we can. */
3625 free_after_parsing (cfun);
3626 if (! DECL_DEFER_OUTPUT (decl))
3628 free_after_compilation (cfun);
3629 DECL_SAVED_INSNS (decl) = 0;
3635 timevar_pop (TV_REST_OF_COMPILATION);
3638 /* Display help for target options. */
3640 display_target_options (void)
3643 static bool displayed = false;
3645 /* Avoid double printing for --help --target-help. */
3651 if (ARRAY_SIZE (target_switches) > 1
3652 #ifdef TARGET_OPTIONS
3653 || ARRAY_SIZE (target_options) > 1
3661 printf (_("\nTarget specific options:\n"));
3663 for (i = ARRAY_SIZE (target_switches); i--;)
3665 const char *option = target_switches[i].name;
3666 const char *description = target_switches[i].description;
3668 if (option == NULL || *option == 0)
3670 else if (description == NULL)
3675 printf (_(" -m%-23s [undocumented]\n"), option);
3677 else if (*description != 0)
3678 doc += printf (" -m%-23s %s\n", option, _(description));
3681 #ifdef TARGET_OPTIONS
3682 for (i = ARRAY_SIZE (target_options); i--;)
3684 const char *option = target_options[i].prefix;
3685 const char *description = target_options[i].description;
3687 if (option == NULL || *option == 0)
3689 else if (description == NULL)
3694 printf (_(" -m%-23s [undocumented]\n"), option);
3696 else if (*description != 0)
3697 doc += printf (" -m%-23s %s\n", option, _(description));
3703 printf (_("\nThere are undocumented target specific options as well.\n"));
3705 printf (_(" They exist, but they are not documented.\n"));
3710 /* Parse a -d... command line switch. */
3713 decode_d_option (const char *arg)
3721 for (i = 0; i < (int) DFI_MAX; ++i)
3722 dump_file[i].enabled = 1;
3728 flag_print_asm_name = 1;
3731 flag_dump_rtl_in_asm = 1;
3732 flag_print_asm_name = 1;
3735 graph_dump_format = vcg;
3738 rtl_dump_and_exit = 1;
3743 case 'D': /* These are handled by the preprocessor. */
3747 setup_core_dumping();
3752 for (i = 0; i < (int) DFI_MAX; ++i)
3753 if (c == dump_file[i].debug_switch)
3755 dump_file[i].enabled = 1;
3760 warning ("unrecognized gcc debugging option: %c", c);
3765 /* Indexed by enum debug_info_type. */
3766 const char *const debug_type_names[] =
3768 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3771 /* Decode -m switches. */
3772 /* Decode the switch -mNAME. */
3775 set_target_switch (const char *name)
3778 int valid_target_option = 0;
3780 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3781 if (!strcmp (target_switches[j].name, name))
3783 if (target_switches[j].value < 0)
3784 target_flags &= ~-target_switches[j].value;
3786 target_flags |= target_switches[j].value;
3789 if (target_switches[j].value < 0)
3790 target_flags_explicit |= -target_switches[j].value;
3792 target_flags_explicit |= target_switches[j].value;
3794 valid_target_option = 1;
3797 #ifdef TARGET_OPTIONS
3798 if (!valid_target_option)
3799 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3801 int len = strlen (target_options[j].prefix);
3802 if (target_options[j].value)
3804 if (!strcmp (target_options[j].prefix, name))
3806 *target_options[j].variable = target_options[j].value;
3807 valid_target_option = 1;
3812 if (!strncmp (target_options[j].prefix, name, len))
3814 *target_options[j].variable = name + len;
3815 valid_target_option = 1;
3821 if (!valid_target_option)
3822 error ("invalid option `%s'", name);
3825 /* Print version information to FILE.
3826 Each line begins with INDENT (for the case where FILE is the
3827 assembler output file). */
3830 print_version (FILE *file, const char *indent)
3833 #define __VERSION__ "[?]"
3837 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3839 "%s%s%s version %s (%s) compiled by CC.\n"
3841 , indent, *indent != 0 ? " " : "",
3842 lang_hooks.name, version_string, TARGET_NAME,
3843 indent, __VERSION__);
3844 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3845 indent, *indent != 0 ? " " : "",
3846 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3849 /* Print an option value and return the adjusted position in the line.
3850 ??? We don't handle error returns from fprintf (disk full); presumably
3851 other code will catch a disk full though. */
3854 print_single_switch (FILE *file, int pos, int max,
3855 const char *indent, const char *sep, const char *term,
3856 const char *type, const char *name)
3858 /* The ultrix fprintf returns 0 on success, so compute the result we want
3859 here since we need it for the following test. */
3860 int len = strlen (sep) + strlen (type) + strlen (name);
3865 fprintf (file, "%s", term);
3870 fprintf (file, "%s", indent);
3871 pos = strlen (indent);
3873 fprintf (file, "%s%s%s", sep, type, name);
3878 /* Print active target switches to FILE.
3879 POS is the current cursor position and MAX is the size of a "line".
3880 Each line begins with INDENT and ends with TERM.
3881 Each switch is separated from the next by SEP. */
3884 print_switch_values (FILE *file, int pos, int max,
3885 const char *indent, const char *sep, const char *term)
3890 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3891 that it can be printed below. This helps reproducibility. */
3894 /* Print the options as passed. */
3895 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3896 _("options passed: "), "");
3898 for (p = &save_argv[1]; *p != NULL; p++)
3902 if (strcmp (*p, "-o") == 0)
3908 if (strcmp (*p, "-quiet") == 0)
3910 if (strcmp (*p, "-version") == 0)
3915 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3918 fprintf (file, "%s", term);
3920 /* Print the -f and -m options that have been enabled.
3921 We don't handle language specific options but printing argv
3924 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3925 _("options enabled: "), "");
3927 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3928 if (*f_options[j].variable == f_options[j].on_value)
3929 pos = print_single_switch (file, pos, max, indent, sep, term,
3930 "-f", f_options[j].string);
3932 /* Print target specific options. */
3934 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3935 if (target_switches[j].name[0] != '\0'
3936 && target_switches[j].value > 0
3937 && ((target_switches[j].value & target_flags)
3938 == target_switches[j].value))
3940 pos = print_single_switch (file, pos, max, indent, sep, term,
3941 "-m", target_switches[j].name);
3944 #ifdef TARGET_OPTIONS
3945 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3946 if (*target_options[j].variable != NULL)
3949 sprintf (prefix, "-m%s", target_options[j].prefix);
3950 pos = print_single_switch (file, pos, max, indent, sep, term,
3951 prefix, *target_options[j].variable);
3955 fprintf (file, "%s", term);
3958 /* Open assembly code output file. Do this even if -fsyntax-only is
3959 on, because then the driver will have provided the name of a
3960 temporary file or bit bucket for us. NAME is the file specified on
3961 the command line, possibly NULL. */
3963 init_asm_output (const char *name)
3965 if (name == NULL && asm_file_name == 0)
3966 asm_out_file = stdout;
3969 if (asm_file_name == 0)
3971 int len = strlen (dump_base_name);
3972 char *dumpname = xmalloc (len + 6);
3973 memcpy (dumpname, dump_base_name, len + 1);
3974 strip_off_ending (dumpname, len);
3975 strcat (dumpname, ".s");
3976 asm_file_name = dumpname;
3978 if (!strcmp (asm_file_name, "-"))
3979 asm_out_file = stdout;
3981 asm_out_file = fopen (asm_file_name, "w+");
3982 if (asm_out_file == 0)
3983 fatal_error ("can't open %s for writing: %m", asm_file_name);
3986 #ifdef IO_BUFFER_SIZE
3987 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
3988 _IOFBF, IO_BUFFER_SIZE);
3991 if (!flag_syntax_only)
3993 targetm.asm_out.file_start ();
3995 #ifdef ASM_COMMENT_START
3996 if (flag_verbose_asm)
3998 /* Print the list of options in effect. */
3999 print_version (asm_out_file, ASM_COMMENT_START);
4000 print_switch_values (asm_out_file, 0, MAX_LINE,
4001 ASM_COMMENT_START, " ", "\n");
4002 /* Add a blank line here so it appears in assembler output but not
4004 fprintf (asm_out_file, "\n");
4010 /* Default version of get_pch_validity.
4011 By default, every flag difference is fatal; that will be mostly right for
4012 most targets, but completely right for very few. */
4015 default_get_pch_validity (size_t *len)
4017 #ifdef TARGET_OPTIONS
4022 *len = sizeof (target_flags) + 2;
4023 #ifdef TARGET_OPTIONS
4024 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4027 if (*target_options[i].variable)
4028 *len += strlen (*target_options[i].variable);
4032 result = r = xmalloc (*len);
4036 memcpy (r, &target_flags, sizeof (target_flags));
4037 r += sizeof (target_flags);
4039 #ifdef TARGET_OPTIONS
4040 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4042 const char *str = *target_options[i].variable;
4046 l = strlen (str) + 1;
4055 /* Default version of pch_valid_p. */
4058 default_pch_valid_p (const void *data_p, size_t len)
4060 const char *data = (const char *)data_p;
4061 const char *flag_that_differs = NULL;
4064 /* -fpic and -fpie also usually make a PCH invalid. */
4065 if (data[0] != flag_pic)
4066 return _("created and used with different settings of -fpic");
4067 if (data[1] != flag_pie)
4068 return _("created and used with different settings of -fpie");
4071 /* Check target_flags. */
4072 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
4074 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
4079 memcpy (&tf, data, sizeof (target_flags));
4081 bits = target_switches[i].value;
4084 if ((target_flags & bits) != (tf & bits))
4086 flag_that_differs = target_switches[i].name;
4092 data += sizeof (target_flags);
4093 len -= sizeof (target_flags);
4095 /* Check string options. */
4096 #ifdef TARGET_OPTIONS
4097 for (i = 0; i < ARRAY_SIZE (target_options); i++)
4099 const char *str = *target_options[i].variable;
4103 l = strlen (str) + 1;
4104 if (len < l || memcmp (data, str, l) != 0)
4106 flag_that_differs = target_options[i].prefix;
4119 asprintf (&r, _("created and used with differing settings of `-m%s'"),
4122 return _("out of memory");
4127 /* Default tree printer. Handles declarations only. */
4129 default_tree_printer (pretty_printer * pp, text_info *text)
4131 switch (*text->format_spec)
4137 tree t = va_arg (*text->args_ptr, tree);
4138 const char *n = DECL_NAME (t)
4139 ? (*lang_hooks.decl_printable_name) (t, 2)
4150 /* Initialization of the front end environment, before command line
4151 options are parsed. Signal handlers, internationalization etc.
4152 ARGV0 is main's argv[0]. */
4154 general_init (const char *argv0)
4158 p = argv0 + strlen (argv0);
4159 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4163 xmalloc_set_program_name (progname);
4167 gcc_init_libintl ();
4169 /* Initialize the diagnostics reporting machinery, so option parsing
4170 can give warnings and errors. */
4171 diagnostic_initialize (global_dc);
4172 /* Set a default printer. Language specific initializations will
4173 override it later. */
4174 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4176 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4178 signal (SIGSEGV, crash_signal);
4181 signal (SIGILL, crash_signal);
4184 signal (SIGBUS, crash_signal);
4187 signal (SIGABRT, crash_signal);
4189 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4190 signal (SIGIOT, crash_signal);
4193 signal (SIGFPE, crash_signal);
4196 /* Other host-specific signal setup. */
4197 (*host_hooks.extra_signals)();
4199 /* Initialize the garbage-collector, string pools and tree type hash
4205 /* Initialize register usage now so switches may override. */
4208 /* Register the language-independent parameters. */
4209 add_params (lang_independent_params, LAST_PARAM);
4211 /* This must be done after add_params but before argument processing. */
4212 init_ggc_heuristics();
4215 /* Process the options that have been parsed. */
4217 process_options (void)
4219 /* Allow the front end to perform consistency checks and do further
4220 initialization based on the command line options. This hook also
4221 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4222 so we can correctly initialize debug output. */
4223 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4224 input_filename = main_input_filename;
4226 #ifdef OVERRIDE_OPTIONS
4227 /* Some machines may reject certain combinations of options. */
4231 /* Set aux_base_name if not already set. */
4234 else if (main_input_filename)
4236 char *name = xstrdup (lbasename (main_input_filename));
4238 strip_off_ending (name, strlen (name));
4239 aux_base_name = name;
4242 aux_base_name = "gccaux";
4244 /* Set up the align_*_log variables, defaulting them to 1 if they
4245 were still unset. */
4246 if (align_loops <= 0) align_loops = 1;
4247 if (align_loops_max_skip > align_loops || !align_loops)
4248 align_loops_max_skip = align_loops - 1;
4249 align_loops_log = floor_log2 (align_loops * 2 - 1);
4250 if (align_jumps <= 0) align_jumps = 1;
4251 if (align_jumps_max_skip > align_jumps || !align_jumps)
4252 align_jumps_max_skip = align_jumps - 1;
4253 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4254 if (align_labels <= 0) align_labels = 1;
4255 align_labels_log = floor_log2 (align_labels * 2 - 1);
4256 if (align_labels_max_skip > align_labels || !align_labels)
4257 align_labels_max_skip = align_labels - 1;
4258 if (align_functions <= 0) align_functions = 1;
4259 align_functions_log = floor_log2 (align_functions * 2 - 1);
4261 /* Unrolling all loops implies that standard loop unrolling must also
4263 if (flag_unroll_all_loops)
4264 flag_unroll_loops = 1;
4266 if (flag_unroll_loops)
4268 flag_old_unroll_loops = 0;
4269 flag_old_unroll_all_loops = 0;
4272 if (flag_old_unroll_all_loops)
4273 flag_old_unroll_loops = 1;
4275 /* Old loop unrolling requires that strength_reduction be on also. Silently
4276 turn on strength reduction here if it isn't already on. Also, the loop
4277 unrolling code assumes that cse will be run after loop, so that must
4278 be turned on also. */
4279 if (flag_old_unroll_loops)
4281 flag_strength_reduce = 1;
4282 flag_rerun_cse_after_loop = 1;
4284 if (flag_unroll_loops || flag_peel_loops)
4285 flag_rerun_cse_after_loop = 1;
4287 if (flag_non_call_exceptions)
4288 flag_asynchronous_unwind_tables = 1;
4289 if (flag_asynchronous_unwind_tables)
4290 flag_unwind_tables = 1;
4292 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4294 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4295 flag_unit_at_a_time = 0;
4297 if (flag_value_profile_transformations)
4298 flag_profile_values = 1;
4300 /* Warn about options that are not supported on this machine. */
4301 #ifndef INSN_SCHEDULING
4302 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4303 warning ("instruction scheduling not supported on this target machine");
4306 if (flag_delayed_branch)
4307 warning ("this target machine does not have delayed branches");
4310 user_label_prefix = USER_LABEL_PREFIX;
4311 if (flag_leading_underscore != -1)
4313 /* If the default prefix is more complicated than "" or "_",
4314 issue a warning and ignore this option. */
4315 if (user_label_prefix[0] == 0 ||
4316 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4318 user_label_prefix = flag_leading_underscore ? "_" : "";
4321 warning ("-f%sleading-underscore not supported on this target machine",
4322 flag_leading_underscore ? "" : "no-");
4325 /* If we are in verbose mode, write out the version and maybe all the
4326 option flags in use. */
4329 print_version (stderr, "");
4331 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4334 if (flag_syntax_only)
4336 write_symbols = NO_DEBUG;
4340 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4342 if (debug_info_level == DINFO_LEVEL_NONE)
4343 write_symbols = NO_DEBUG;
4345 /* Now we know write_symbols, set up the debug hooks based on it.
4346 By default we do nothing for debug output. */
4347 if (write_symbols == NO_DEBUG)
4348 debug_hooks = &do_nothing_debug_hooks;
4349 #if defined(DBX_DEBUGGING_INFO)
4350 else if (write_symbols == DBX_DEBUG)
4351 debug_hooks = &dbx_debug_hooks;
4353 #if defined(XCOFF_DEBUGGING_INFO)
4354 else if (write_symbols == XCOFF_DEBUG)
4355 debug_hooks = &xcoff_debug_hooks;
4357 #ifdef SDB_DEBUGGING_INFO
4358 else if (write_symbols == SDB_DEBUG)
4359 debug_hooks = &sdb_debug_hooks;
4361 #ifdef DWARF_DEBUGGING_INFO
4362 else if (write_symbols == DWARF_DEBUG)
4363 debug_hooks = &dwarf_debug_hooks;
4365 #ifdef DWARF2_DEBUGGING_INFO
4366 else if (write_symbols == DWARF2_DEBUG)
4367 debug_hooks = &dwarf2_debug_hooks;
4369 #ifdef VMS_DEBUGGING_INFO
4370 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4371 debug_hooks = &vmsdbg_debug_hooks;
4374 error ("target system does not support the \"%s\" debug format",
4375 debug_type_names[write_symbols]);
4377 /* If auxiliary info generation is desired, open the output file.
4378 This goes in the same directory as the source file--unlike
4379 all the other output files. */
4380 if (flag_gen_aux_info)
4382 aux_info_file = fopen (aux_info_file_name, "w");
4383 if (aux_info_file == 0)
4384 fatal_error ("can't open %s: %m", aux_info_file_name);
4387 if (! targetm.have_named_sections)
4389 if (flag_function_sections)
4391 warning ("-ffunction-sections not supported for this target");
4392 flag_function_sections = 0;
4394 if (flag_data_sections)
4396 warning ("-fdata-sections not supported for this target");
4397 flag_data_sections = 0;
4401 if (flag_function_sections && profile_flag)
4403 warning ("-ffunction-sections disabled; it makes profiling impossible");
4404 flag_function_sections = 0;
4407 #ifndef HAVE_prefetch
4408 if (flag_prefetch_loop_arrays)
4410 warning ("-fprefetch-loop-arrays not supported for this target");
4411 flag_prefetch_loop_arrays = 0;
4414 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4416 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4417 flag_prefetch_loop_arrays = 0;
4421 /* This combination of options isn't handled for i386 targets and doesn't
4422 make much sense anyway, so don't allow it. */
4423 if (flag_prefetch_loop_arrays && optimize_size)
4425 warning ("-fprefetch-loop-arrays is not supported with -Os");
4426 flag_prefetch_loop_arrays = 0;
4429 #ifndef OBJECT_FORMAT_ELF
4430 if (flag_function_sections && write_symbols != NO_DEBUG)
4431 warning ("-ffunction-sections may affect debugging on some targets");
4434 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4435 if (flag_signaling_nans)
4436 flag_trapping_math = 1;
4439 /* Initialize the compiler back end. */
4443 init_adjust_machine_modes ();
4445 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4446 || debug_info_level == DINFO_LEVEL_VERBOSE
4447 #ifdef VMS_DEBUGGING_INFO
4448 /* Enable line number info for traceback. */
4449 || debug_info_level > DINFO_LEVEL_NONE
4451 || flag_test_coverage
4452 || warn_notreached);
4455 init_fake_stack_mems ();
4459 init_function_once ();
4460 init_varasm_once ();
4462 /* The following initialization functions need to generate rtl, so
4463 provide a dummy function context for them. */
4464 init_dummy_function_start ();
4466 if (flag_caller_saves)
4467 init_caller_save ();
4468 expand_dummy_function_end ();
4471 /* Language-dependent initialization. Returns nonzero on success. */
4473 lang_dependent_init (const char *name)
4475 if (dump_base_name == 0)
4476 dump_base_name = name ? name : "gccdump";
4478 /* Other front-end initialization. */
4479 if ((*lang_hooks.init) () == 0)
4482 init_asm_output (name);
4484 /* These create various _DECL nodes, so need to be called after the
4485 front end is initialized. */
4489 /* The following initialization functions need to generate rtl, so
4490 provide a dummy function context for them. */
4491 init_dummy_function_start ();
4493 expand_dummy_function_end ();
4495 /* If dbx symbol table desired, initialize writing it and output the
4496 predefined types. */
4497 timevar_push (TV_SYMOUT);
4499 #ifdef DWARF2_UNWIND_INFO
4500 if (dwarf2out_do_frame ())
4501 dwarf2out_frame_init ();
4504 /* Now we have the correct original filename, we can initialize
4506 (*debug_hooks->init) (name);
4508 timevar_pop (TV_SYMOUT);
4513 /* Clean up: close opened files, etc. */
4518 /* Close the dump files. */
4519 if (flag_gen_aux_info)
4521 fclose (aux_info_file);
4523 unlink (aux_info_file_name);
4526 /* Close non-debugging input and output files. Take special care to note
4527 whether fclose returns an error, since the pages might still be on the
4528 buffer chain while the file is open. */
4532 if (ferror (asm_out_file) != 0)
4533 fatal_error ("error writing to %s: %m", asm_file_name);
4534 if (fclose (asm_out_file) != 0)
4535 fatal_error ("error closing %s: %m", asm_file_name);
4538 /* Do whatever is necessary to finish printing the graphs. */
4539 if (graph_dump_format != no_graph)
4543 for (i = 0; i < (int) DFI_MAX; ++i)
4544 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4549 sprintf (seq, DUMPFILE_FORMAT, i);
4550 suffix = concat (seq, dump_file[i].extension, NULL);
4551 finish_graph_dump_file (dump_base_name, suffix);
4558 ggc_print_statistics ();
4559 stringpool_statistics ();
4560 dump_tree_statistics ();
4563 /* Free up memory for the benefit of leak detectors. */
4566 /* Language-specific end of compilation actions. */
4567 (*lang_hooks.finish) ();
4570 /* Initialize the compiler, and compile the input file. */
4574 /* Initialize timing first. The C front ends read the main file in
4575 the post_options hook, and C++ does file timings. */
4576 if (time_report || !quiet_flag || flag_detailed_statistics)
4578 timevar_start (TV_TOTAL);
4582 /* Don't do any more if an error has already occurred. */
4585 /* Set up the back-end if requested. */
4589 /* Language-dependent initialization. Returns true on success. */
4590 if (lang_dependent_init (main_input_filename))
4592 if (flag_unit_at_a_time)
4594 open_dump_file (DFI_cgraph, NULL);
4595 cgraph_dump_file = rtl_dump_file;
4596 rtl_dump_file = NULL;
4601 if (flag_unit_at_a_time)
4603 rtl_dump_file = cgraph_dump_file;
4604 cgraph_dump_file = NULL;
4605 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4612 /* Stop timing and print the times. */
4613 timevar_stop (TV_TOTAL);
4614 timevar_print (stderr);
4617 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4618 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4619 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4621 It is not safe to call this function more than once. */
4624 toplev_main (unsigned int argc, const char **argv)
4628 /* Initialization of GCC's environment, and diagnostics. */
4629 general_init (argv[0]);
4631 /* Parse the options and do minimal processing; basically just
4632 enough to default flags appropriately. */
4633 decode_options (argc, argv);
4637 /* Exit early if we can (e.g. -help). */
4638 if (!exit_after_options)
4641 if (errorcount || sorrycount)
4642 return (FATAL_EXIT_CODE);
4644 return (SUCCESS_EXIT_CODE);