1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addressof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
284 DFI_branch_target_load,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file[DFI_MAX] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index, tree);
345 static void close_dump_file (enum dump_file_index,
346 void (*) (FILE *, rtx), rtx);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit;
351 int flag_print_asm_name;
352 enum graph_dump_types graph_dump_format;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name;
358 /* Nonzero means do optimizations. -O.
359 Particular numeric values stand for particular amounts of optimization;
360 thus, -O2 stores 2 here. However, the optimizations beyond the basic
361 ones are not controlled directly by this variable. Instead, they are
362 controlled by individual `flag_...' variables that are defaulted
363 based on this variable. */
367 /* Nonzero means optimize for size. -Os.
368 The only valid values are zero and nonzero. When optimize_size is
369 nonzero, optimize defaults to 2, but certain individual code
370 bloating optimizations are disabled. */
372 int optimize_size = 0;
374 /* The FUNCTION_DECL for the function currently being compiled,
375 or 0 if between functions. */
376 tree current_function_decl;
378 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
380 tree current_function_func_begin_label;
382 /* Nonzero if doing dwarf2 duplicate elimination. */
384 int flag_eliminate_dwarf2_dups = 0;
386 /* Nonzero if doing unused type elimination. */
388 int flag_eliminate_unused_debug_types = 1;
390 /* Nonzero means emit debugging information only for symbols which are used. */
391 int flag_debug_only_used_symbols = 0;
393 /* Nonzero if generating code to do profiling. */
395 int profile_flag = 0;
397 /* Nonzero if generating code to profile program flow graph arcs. */
399 int profile_arc_flag = 0;
401 /* Nonzero if value histograms should be measured. */
403 int flag_profile_values = 0;
405 /* Nonzero if generating info for gcov to calculate line test coverage. */
407 int flag_test_coverage = 0;
409 /* Nonzero indicates that branch taken probabilities should be calculated. */
411 int flag_branch_probabilities = 0;
413 /* Nonzero if basic blocks should be reordered. */
415 int flag_reorder_blocks = 0;
417 /* Nonzero if functions should be reordered. */
419 int flag_reorder_functions = 0;
421 /* Nonzero if registers should be renamed. */
423 int flag_rename_registers = 0;
424 int flag_cprop_registers = 0;
426 /* Nonzero for -pedantic switch: warn about anything
427 that standard spec forbids. */
431 /* Temporarily suppress certain warnings.
432 This is set while reading code from a system header file. */
434 int in_system_header = 0;
436 /* Don't print functions as they are compiled. -quiet. */
440 /* Print times taken by the various passes. -ftime-report. */
444 /* Print memory still in use at end of compilation (which may have little
445 to do with peak memory consumption). -fmem-report. */
449 /* Nonzero means to collect statistics which might be expensive
450 and to print them when we are done. */
451 int flag_detailed_statistics = 0;
453 /* A random sequence of characters, unless overridden by user. */
454 const char *flag_random_seed;
456 /* A local time stamp derived from the time of compilation. It will be
457 zero if the system cannot provide a time. It will be -1u, if the
458 user has specified a particular random seed. */
463 /* Nonzero means `char' should be signed. */
465 int flag_signed_char;
467 /* Nonzero means give an enum type only as many bytes as it needs. */
469 int flag_short_enums;
471 /* Nonzero for -fcaller-saves: allocate values in regs that need to
472 be saved across function calls, if that produces overall better code.
473 Optional now, so people can test it. */
475 #ifdef DEFAULT_CALLER_SAVES
476 int flag_caller_saves = 1;
478 int flag_caller_saves = 0;
481 /* Nonzero if structures and unions should be returned in memory.
483 This should only be defined if compatibility with another compiler or
484 with an ABI is needed, because it results in slower code. */
486 #ifndef DEFAULT_PCC_STRUCT_RETURN
487 #define DEFAULT_PCC_STRUCT_RETURN 1
490 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
492 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
494 /* Nonzero for -fforce-mem: load memory value into a register
495 before arithmetic on it. This makes better cse but slower compilation. */
497 int flag_force_mem = 0;
499 /* Nonzero for -fforce-addr: load memory address into a register before
500 reference to memory. This makes better cse but slower compilation. */
502 int flag_force_addr = 0;
504 /* Nonzero for -fdefer-pop: don't pop args after each function call;
505 instead save them up to pop many calls' args with one insns. */
507 int flag_defer_pop = 0;
509 /* Nonzero for -ffloat-store: don't allocate floats and doubles
510 in extended-precision registers. */
512 int flag_float_store = 0;
514 /* Nonzero for -fcse-follow-jumps:
515 have cse follow jumps to do a more extensive job. */
517 int flag_cse_follow_jumps;
519 /* Nonzero for -fcse-skip-blocks:
520 have cse follow a branch around a block. */
521 int flag_cse_skip_blocks;
523 /* Nonzero for -fexpensive-optimizations:
524 perform miscellaneous relatively-expensive optimizations. */
525 int flag_expensive_optimizations;
527 /* Nonzero for -fthread-jumps:
528 have jump optimize output of loop. */
530 int flag_thread_jumps;
532 /* Nonzero enables strength-reduction in loop.c. */
534 int flag_strength_reduce = 0;
536 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
537 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
538 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
541 int flag_old_unroll_loops;
543 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
544 This is generally not a win. */
546 int flag_old_unroll_all_loops;
548 /* Enables unrolling of simple loops in loop-unroll.c. */
549 int flag_unroll_loops;
551 /* Enables unrolling of all loops in loop-unroll.c. */
552 int flag_unroll_all_loops;
554 /* Nonzero enables loop peeling. */
557 /* Nonzero enables loop unswitching. */
558 int flag_unswitch_loops;
560 /* Nonzero enables prefetch optimizations for arrays in loops. */
562 int flag_prefetch_loop_arrays;
564 /* Nonzero forces all invariant computations in loops to be moved
567 int flag_move_all_movables = 0;
569 /* Nonzero forces all general induction variables in loops to be
572 int flag_reduce_all_givs = 0;
574 /* Nonzero to perform full register move optimization passes. This is the
577 int flag_regmove = 0;
579 /* Nonzero for -fwritable-strings:
580 store string constants in data segment and don't uniquize them. */
582 int flag_writable_strings = 0;
584 /* Nonzero means don't put addresses of constant functions in registers.
585 Used for compiling the Unix kernel, where strange substitutions are
586 done on the assembly output. */
588 int flag_no_function_cse = 0;
590 /* Nonzero for -fomit-frame-pointer:
591 don't make a frame pointer in simple functions that don't require one. */
593 int flag_omit_frame_pointer = 0;
595 /* Nonzero means place each function into its own section on those platforms
596 which support arbitrary section names and unlimited numbers of sections. */
598 int flag_function_sections = 0;
600 /* ... and similar for data. */
602 int flag_data_sections = 0;
604 /* Nonzero to inhibit use of define_optimization peephole opts. */
606 int flag_no_peephole = 0;
608 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
610 int flag_optimize_sibling_calls = 0;
612 /* Nonzero means the front end generally wants `errno' maintained by math
613 operations, like built-in SQRT. */
615 int flag_errno_math = 1;
617 /* Nonzero means that unsafe floating-point math optimizations are allowed
618 for the sake of speed. IEEE compliance is not guaranteed, and operations
619 are allowed to assume that their arguments and results are "normal"
620 (e.g., nonnegative for SQRT). */
622 int flag_unsafe_math_optimizations = 0;
624 /* Nonzero means that no NaNs or +-Infs are expected. */
626 int flag_finite_math_only = 0;
628 /* Zero means that floating-point math operations cannot generate a
629 (user-visible) trap. This is the case, for example, in nonstop
630 IEEE 754 arithmetic. Trapping conditions include division by zero,
631 overflow, underflow, invalid and inexact, but does not include
632 operations on signaling NaNs (see below). */
634 int flag_trapping_math = 1;
636 /* Nonzero means disable transformations that assume default floating
637 point rounding behavior. */
639 int flag_rounding_math = 0;
641 /* Nonzero means disable transformations observable by signaling NaNs.
642 This option implies that any operation on an IEEE signaling NaN can
643 generate a (user-visible) trap. */
645 int flag_signaling_nans = 0;
647 /* 0 means straightforward implementation of complex divide acceptable.
648 1 means wide ranges of inputs must work for complex divide.
649 2 means C99-like requirements for complex divide (not yet implemented). */
651 int flag_complex_divide_method = 0;
653 /* Nonzero means just do syntax checking; don't output anything. */
655 int flag_syntax_only = 0;
657 /* Nonzero means perform loop optimizer. */
659 int flag_loop_optimize;
661 /* Nonzero means perform crossjumping. */
663 int flag_crossjumping;
665 /* Nonzero means perform if conversion. */
667 int flag_if_conversion;
669 /* Nonzero means perform if conversion after reload. */
671 int flag_if_conversion2;
673 /* Nonzero means to use global dataflow analysis to eliminate
674 useless null pointer tests. */
676 int flag_delete_null_pointer_checks;
678 /* Nonzero means perform global CSE. */
682 /* Nonzero means to do the enhanced load motion during gcse, which trys
683 to hoist loads by not killing them when a store to the same location
686 int flag_gcse_lm = 1;
688 /* Nonzero means to perform store motion after gcse, which will try to
689 move stores closer to the exit block. Its not very effective without
692 int flag_gcse_sm = 1;
694 /* Perform target register optimization before prologue / epilogue
697 int flag_branch_target_load_optimize = 0;
699 /* Perform target register optimization after prologue / epilogue
700 threading and jump2. */
702 int flag_branch_target_load_optimize2 = 0;
704 /* Nonzero means to rerun cse after loop optimization. This increases
705 compilation time about 20% and picks up a few more common expressions. */
707 int flag_rerun_cse_after_loop;
709 /* Nonzero means to run loop optimizations twice. */
711 int flag_rerun_loop_opt;
713 /* Nonzero for -finline-functions: ok to inline functions that look like
714 good inline candidates. */
716 int flag_inline_functions;
718 /* Nonzero for -fkeep-inline-functions: even if we make a function
719 go inline everywhere, keep its definition around for debugging
722 int flag_keep_inline_functions;
724 /* Nonzero means that functions will not be inlined. */
726 int flag_no_inline = 2;
728 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
729 not just because the tree inliner turned us off. */
731 int flag_really_no_inline = 2;
733 /* Nonzero means that we should emit static const variables
734 regardless of whether or not optimization is turned on. */
736 int flag_keep_static_consts = 1;
738 /* Nonzero means we should be saving declaration info into a .X file. */
740 int flag_gen_aux_info = 0;
742 /* Specified name of aux-info file. */
744 const char *aux_info_file_name;
746 /* Nonzero means make the text shared if supported. */
748 int flag_shared_data;
750 /* Nonzero means schedule into delayed branch slots if supported. */
752 int flag_delayed_branch;
754 /* Nonzero if we are compiling pure (sharable) code.
755 Value is 1 if we are doing "small" pic; value is 2 if we're doing
760 /* Nonzero if we are compiling position independent code for executable.
761 The value is 1 if we are doing "small" pic; value is 2 if we're doing
766 /* Nonzero if we are compiling code for a shared library, zero for
771 /* Set to the default thread-local storage (tls) model to use. */
773 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
775 /* Nonzero means generate extra code for exception handling and enable
776 exception handling. */
780 /* Nonzero means generate frame unwind info table when supported. */
782 int flag_unwind_tables = 0;
784 /* Nonzero means generate frame unwind info table exact at each insn
787 int flag_asynchronous_unwind_tables = 0;
789 /* Nonzero means don't place uninitialized global data in common storage
794 /* Nonzero means change certain warnings into errors.
795 Usually these are warnings about failure to conform to some standard. */
797 int flag_pedantic_errors = 0;
799 /* flag_schedule_insns means schedule insns within basic blocks (before
801 flag_schedule_insns_after_reload means schedule insns after
804 int flag_schedule_insns = 0;
805 int flag_schedule_insns_after_reload = 0;
807 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
808 int flag_sched2_use_superblocks = 0;
810 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
812 int flag_sched2_use_traces = 0;
814 /* The following flags have effect only for scheduling before register
817 flag_schedule_interblock means schedule insns across basic blocks.
818 flag_schedule_speculative means allow speculative motion of non-load insns.
819 flag_schedule_speculative_load means allow speculative motion of some
821 flag_schedule_speculative_load_dangerous allows speculative motion of more
824 int flag_schedule_interblock = 1;
825 int flag_schedule_speculative = 1;
826 int flag_schedule_speculative_load = 0;
827 int flag_schedule_speculative_load_dangerous = 0;
829 int flag_single_precision_constant;
831 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
832 by a cheaper branch on a count register. */
833 int flag_branch_on_count_reg = 1;
835 /* -finhibit-size-directive inhibits output of .size for ELF.
836 This is used only for compiling crtstuff.c,
837 and it may be extended to other effects
838 needed for crtstuff.c on other systems. */
839 int flag_inhibit_size_directive = 0;
841 /* -fverbose-asm causes extra commentary information to be produced in
842 the generated assembly code (to make it more readable). This option
843 is generally only of use to those who actually need to read the
844 generated assembly code (perhaps while debugging the compiler itself).
845 -fno-verbose-asm, the default, causes the extra information
846 to be omitted and is useful when comparing two assembler files. */
848 int flag_verbose_asm = 0;
850 /* -dA causes debug commentary information to be produced in
851 the generated assembly code (to make it more readable). This option
852 is generally only of use to those who actually need to read the
853 generated assembly code (perhaps while debugging the compiler itself).
854 Currently, this switch is only used by dwarfout.c; however, it is intended
855 to be a catchall for printing debug information in the assembler file. */
857 int flag_debug_asm = 0;
859 /* -dP causes the rtl to be emitted as a comment in assembly. */
861 int flag_dump_rtl_in_asm = 0;
863 /* -fgnu-linker specifies use of the GNU linker for initializations.
864 (Or, more generally, a linker that handles initializations.)
865 -fno-gnu-linker says that collect2 will be used. */
867 int flag_gnu_linker = 0;
869 int flag_gnu_linker = 1;
872 /* Nonzero means put zero initialized data in the bss section. */
873 int flag_zero_initialized_in_bss = 1;
878 /* Enable ssa conditional constant propagation. */
879 int flag_ssa_ccp = 0;
881 /* Enable ssa aggressive dead code elimination. */
882 int flag_ssa_dce = 0;
884 /* Tag all structures with __attribute__(packed). */
885 int flag_pack_struct = 0;
887 /* Emit code to check for stack overflow; also may cause large objects
888 to be allocated dynamically. */
889 int flag_stack_check;
891 /* When non-NULL, indicates that whenever space is allocated on the
892 stack, the resulting stack pointer must not pass this
893 address---that is, for stacks that grow downward, the stack pointer
894 must always be greater than or equal to this address; for stacks
895 that grow upward, the stack pointer must be less than this address.
896 At present, the rtx may be either a REG or a SYMBOL_REF, although
897 the support provided depends on the backend. */
900 /* 0 if pointer arguments may alias each other. True in C.
901 1 if pointer arguments may not alias each other but may alias
903 2 if pointer arguments may not alias each other and may not
904 alias global variables. True in Fortran.
905 This defaults to 0 for C. */
906 int flag_argument_noalias = 0;
908 /* Nonzero if we should do (language-dependent) alias analysis.
909 Typically, this analysis will assume that expressions of certain
910 types do not alias expressions of certain other types. Only used
911 if alias analysis (in general) is enabled. */
912 int flag_strict_aliasing = 0;
914 /* Instrument functions with calls at entry and exit, for profiling. */
915 int flag_instrument_function_entry_exit = 0;
917 /* Nonzero means ignore `#ident' directives. 0 means handle them.
918 On SVR4 targets, it also controls whether or not to emit a
919 string identifying the compiler. */
921 int flag_no_ident = 0;
923 /* This will perform a peephole pass before sched2. */
924 int flag_peephole2 = 0;
926 /* This will try to guess branch probabilities. */
927 int flag_guess_branch_prob = 0;
929 /* -fcheck-bounds causes gcc to generate array bounds checks.
930 For C, C++, ObjC: defaults to off.
931 For Java: defaults to on.
932 For Fortran: defaults to off. */
933 int flag_bounds_check = 0;
935 /* This will attempt to merge constant section constants, if 1 only
936 string constants and constants from constant pool, if 2 also constant
938 int flag_merge_constants = 1;
940 /* If one, renumber instruction UIDs to reduce the number of
941 unused UIDs if there are a lot of instructions. If greater than
942 one, unconditionally renumber instruction UIDs. */
943 int flag_renumber_insns = 1;
945 /* If nonzero, use the graph coloring register allocator. */
946 int flag_new_regalloc = 0;
948 /* Nonzero if we perform superblock formation. */
952 /* Nonzero if we perform whole unit at a time compilation. */
954 int flag_unit_at_a_time = 0;
956 /* Values of the -falign-* flags: how much to align labels in code.
957 0 means `use default', 1 means `don't align'.
958 For each variable, there is an _log variant which is the power
959 of two not less than the variable, for .align output. */
963 int align_loops_max_skip;
966 int align_jumps_max_skip;
968 int align_labels_log;
969 int align_labels_max_skip;
971 int align_functions_log;
973 /* Like align_functions_log above, but used by front-ends to force the
974 minimum function alignment. Zero means no alignment is forced. */
975 int force_align_functions_log;
979 const char *const string;
983 lang_independent_options;
985 /* Nonzero if signed arithmetic overflow should trap. */
988 /* Nonzero if signed arithmetic overflow should wrap around. */
991 /* Nonzero if subexpressions must be evaluated from left-to-right. */
992 int flag_evaluation_order = 0;
994 /* Add or remove a leading underscore from user symbols. */
995 int flag_leading_underscore = -1;
997 /* The user symbol prefix after having resolved same. */
998 const char *user_label_prefix;
1000 static const param_info lang_independent_params[] = {
1001 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1002 { OPTION, DEFAULT, HELP },
1003 #include "params.def"
1008 /* Table of language-independent -f options.
1009 STRING is the option name. VARIABLE is the address of the variable.
1010 ON_VALUE is the value to store in VARIABLE
1011 if `-fSTRING' is seen as an option.
1012 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1014 static const lang_independent_options f_options[] =
1016 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1017 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1018 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1019 {"float-store", &flag_float_store, 1 },
1020 {"defer-pop", &flag_defer_pop, 1 },
1021 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1022 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1023 {"tracer", &flag_tracer, 1 },
1024 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1025 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1026 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1027 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1028 {"thread-jumps", &flag_thread_jumps, 1 },
1029 {"strength-reduce", &flag_strength_reduce, 1 },
1030 {"unroll-loops", &flag_unroll_loops, 1 },
1031 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1032 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1033 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1034 {"peel-loops", &flag_peel_loops, 1 },
1035 {"unswitch-loops", &flag_unswitch_loops, 1 },
1036 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1037 {"move-all-movables", &flag_move_all_movables, 1 },
1038 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1039 {"writable-strings", &flag_writable_strings, 1 },
1040 {"peephole", &flag_no_peephole, 0 },
1041 {"force-mem", &flag_force_mem, 1 },
1042 {"force-addr", &flag_force_addr, 1 },
1043 {"function-cse", &flag_no_function_cse, 0 },
1044 {"inline-functions", &flag_inline_functions, 1 },
1045 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1046 {"inline", &flag_no_inline, 0 },
1047 {"keep-static-consts", &flag_keep_static_consts, 1 },
1048 {"syntax-only", &flag_syntax_only, 1 },
1049 {"shared-data", &flag_shared_data, 1 },
1050 {"caller-saves", &flag_caller_saves, 1 },
1051 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1052 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1053 {"delayed-branch", &flag_delayed_branch, 1 },
1054 {"gcse", &flag_gcse, 1 },
1055 {"gcse-lm", &flag_gcse_lm, 1 },
1056 {"gcse-sm", &flag_gcse_sm, 1 },
1057 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1058 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1059 {"loop-optimize", &flag_loop_optimize, 1 },
1060 {"crossjumping", &flag_crossjumping, 1 },
1061 {"if-conversion", &flag_if_conversion, 1 },
1062 {"if-conversion2", &flag_if_conversion2, 1 },
1063 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1064 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1065 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1066 {"schedule-insns", &flag_schedule_insns, 1 },
1067 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1068 {"sched-interblock",&flag_schedule_interblock, 1 },
1069 {"sched-spec",&flag_schedule_speculative, 1 },
1070 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1071 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1072 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1073 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1074 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1075 {"pic", &flag_pic, 1 },
1076 {"PIC", &flag_pic, 2 },
1077 {"pie", &flag_pie, 1 },
1078 {"PIE", &flag_pie, 2 },
1079 {"exceptions", &flag_exceptions, 1 },
1080 {"unwind-tables", &flag_unwind_tables, 1 },
1081 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1082 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1083 {"profile-arcs", &profile_arc_flag, 1 },
1084 {"test-coverage", &flag_test_coverage, 1 },
1085 {"branch-probabilities", &flag_branch_probabilities, 1 },
1086 {"profile", &profile_flag, 1 },
1087 {"reorder-blocks", &flag_reorder_blocks, 1 },
1088 {"reorder-functions", &flag_reorder_functions, 1 },
1089 {"rename-registers", &flag_rename_registers, 1 },
1090 {"cprop-registers", &flag_cprop_registers, 1 },
1091 {"common", &flag_no_common, 0 },
1092 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1093 {"function-sections", &flag_function_sections, 1 },
1094 {"data-sections", &flag_data_sections, 1 },
1095 {"verbose-asm", &flag_verbose_asm, 1 },
1096 {"gnu-linker", &flag_gnu_linker, 1 },
1097 {"regmove", &flag_regmove, 1 },
1098 {"optimize-register-move", &flag_regmove, 1 },
1099 {"pack-struct", &flag_pack_struct, 1 },
1100 {"stack-check", &flag_stack_check, 1 },
1101 {"argument-alias", &flag_argument_noalias, 0 },
1102 {"argument-noalias", &flag_argument_noalias, 1 },
1103 {"argument-noalias-global", &flag_argument_noalias, 2 },
1104 {"strict-aliasing", &flag_strict_aliasing, 1 },
1105 {"align-loops", &align_loops, 0 },
1106 {"align-jumps", &align_jumps, 0 },
1107 {"align-labels", &align_labels, 0 },
1108 {"align-functions", &align_functions, 0 },
1109 {"merge-constants", &flag_merge_constants, 1 },
1110 {"merge-all-constants", &flag_merge_constants, 2 },
1111 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1112 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1113 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1114 {"ssa", &flag_ssa, 1 },
1115 {"ssa-ccp", &flag_ssa_ccp, 1 },
1116 {"ssa-dce", &flag_ssa_dce, 1 },
1117 {"leading-underscore", &flag_leading_underscore, 1 },
1118 {"ident", &flag_no_ident, 0 },
1119 { "peephole2", &flag_peephole2, 1 },
1120 {"finite-math-only", &flag_finite_math_only, 1 },
1121 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1122 {"math-errno", &flag_errno_math, 1 },
1123 {"trapping-math", &flag_trapping_math, 1 },
1124 {"rounding-math", &flag_rounding_math, 1 },
1125 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1126 {"signaling-nans", &flag_signaling_nans, 1 },
1127 {"bounds-check", &flag_bounds_check, 1 },
1128 {"single-precision-constant", &flag_single_precision_constant, 1 },
1129 {"time-report", &time_report, 1 },
1130 {"mem-report", &mem_report, 1 },
1131 { "trapv", &flag_trapv, 1 },
1132 { "wrapv", &flag_wrapv, 1 },
1133 { "new-ra", &flag_new_regalloc, 1 }
1136 /* Here is a table, controlled by the tm.h file, listing each -m switch
1137 and which bits in `target_switches' it should set or clear.
1138 If VALUE is positive, it is bits to set.
1139 If VALUE is negative, -VALUE is bits to clear.
1140 (The sign bit is not used so there is no confusion.) */
1144 const char *const name;
1146 const char *const description;
1148 target_switches[] = TARGET_SWITCHES;
1150 /* This table is similar, but allows the switch to have a value. */
1152 #ifdef TARGET_OPTIONS
1155 const char *const prefix;
1156 const char **const variable;
1157 const char *const description;
1158 const char *const value;
1160 target_options[] = TARGET_OPTIONS;
1163 /* Nonzero means warn about function definitions that default the return type
1164 or that use a null return and have a return-type other than void. */
1166 int warn_return_type;
1168 /* Output files for assembler code (real compiler output)
1169 and debugging dumps. */
1172 FILE *aux_info_file;
1173 FILE *rtl_dump_file = NULL;
1174 FILE *cgraph_dump_file = NULL;
1176 /* The current working directory of a translation. It's generally the
1177 directory from which compilation was initiated, but a preprocessed
1178 file may specify the original directory in which it was
1181 static const char *src_pwd;
1183 /* Initialize src_pwd with the given string, and return true. If it
1184 was already initialized, return false. As a special case, it may
1185 be called with a NULL argument to test whether src_pwd has NOT been
1189 set_src_pwd (const char *pwd)
1194 src_pwd = xstrdup (pwd);
1198 /* Return the directory from which the translation unit was initiated,
1199 in case set_src_pwd() was not called before to assign it a
1206 src_pwd = getpwd ();
1211 /* Called when the start of a function definition is parsed,
1212 this function prints on stderr the name of the function. */
1214 announce_function (tree decl)
1218 if (rtl_dump_and_exit)
1219 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1221 verbatim (" %s", (*lang_hooks.decl_printable_name) (decl, 2));
1223 pp_needs_newline (global_dc->printer) = true;
1224 diagnostic_set_last_function (global_dc);
1228 /* Set up a default flag_random_seed and local_tick, unless the user
1229 already specified one. */
1234 if (!flag_random_seed)
1236 unsigned HOST_WIDE_INT value;
1237 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1239 /* Get some more or less random data. */
1240 #ifdef HAVE_GETTIMEOFDAY
1244 gettimeofday (&tv, NULL);
1245 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1249 time_t now = time (NULL);
1251 if (now != (time_t)-1)
1252 local_tick = (unsigned) now;
1255 value = local_tick ^ getpid ();
1257 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1258 flag_random_seed = random_seed;
1260 else if (!local_tick)
1265 /* Decode the string P as an integral parameter.
1266 If the string is indeed an integer return its numeric value else
1267 issue an Invalid Option error for the option PNAME and return DEFVAL.
1268 If PNAME is zero just return DEFVAL, do not call error. */
1271 read_integral_parameter (const char *p, const char *pname, const int defval)
1273 const char *endp = p;
1277 if (ISDIGIT (*endp))
1286 error ("invalid option argument `%s'", pname);
1293 /* Return the logarithm of X, base 2, considering X unsigned,
1294 if X is a power of 2. Otherwise, returns -1.
1296 This should be used via the `exact_log2' macro. */
1299 exact_log2_wide (unsigned HOST_WIDE_INT x)
1302 /* Test for 0 or a power of 2. */
1303 if (x == 0 || x != (x & -x))
1305 while ((x >>= 1) != 0)
1310 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1311 If X is 0, return -1.
1313 This should be used via the floor_log2 macro. */
1316 floor_log2_wide (unsigned HOST_WIDE_INT x)
1325 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1326 into ICE messages, which is much more user friendly. In case the
1327 error printer crashes, reset the signal to prevent infinite recursion. */
1330 crash_signal (int signo)
1332 signal (signo, SIG_DFL);
1333 internal_error ("%s", strsignal (signo));
1336 /* Arrange to dump core on error. (The regular error message is still
1337 printed first, except in the case of abort().) */
1340 setup_core_dumping (void)
1343 signal (SIGABRT, SIG_DFL);
1345 #if defined(HAVE_SETRLIMIT)
1348 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1349 fatal_error ("getting core file size maximum limit: %m");
1350 rlim.rlim_cur = rlim.rlim_max;
1351 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1352 fatal_error ("setting core file size limit to maximum: %m");
1355 diagnostic_abort_on_error (global_dc);
1359 /* Strip off a legitimate source ending from the input string NAME of
1360 length LEN. Rather than having to know the names used by all of
1361 our front ends, we strip off an ending of a period followed by
1362 up to five characters. (Java uses ".class".) */
1365 strip_off_ending (char *name, int len)
1368 for (i = 2; i < 6 && len > i; i++)
1370 if (name[len - i] == '.')
1372 name[len - i] = '\0';
1378 /* Output a quoted string. */
1381 output_quoted_string (FILE *asm_file, const char *string)
1383 #ifdef OUTPUT_QUOTED_STRING
1384 OUTPUT_QUOTED_STRING (asm_file, string);
1388 putc ('\"', asm_file);
1389 while ((c = *string++) != 0)
1393 if (c == '\"' || c == '\\')
1394 putc ('\\', asm_file);
1398 fprintf (asm_file, "\\%03o", (unsigned char) c);
1400 putc ('\"', asm_file);
1404 /* Output a file name in the form wanted by System V. */
1407 output_file_directive (FILE *asm_file, const char *input_name)
1409 int len = strlen (input_name);
1410 const char *na = input_name + len;
1412 /* NA gets INPUT_NAME sans directory names. */
1413 while (na > input_name)
1415 if (IS_DIR_SEPARATOR (na[-1]))
1420 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1421 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1423 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1424 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1426 fprintf (asm_file, "\t.file\t");
1427 output_quoted_string (asm_file, na);
1428 fputc ('\n', asm_file);
1433 /* Routine to open a dump file. Return true if the dump file is enabled. */
1436 open_dump_file (enum dump_file_index index, tree decl)
1439 const char *open_arg;
1442 if (! dump_file[index].enabled)
1445 timevar_push (TV_DUMP);
1446 if (rtl_dump_file != NULL)
1447 fclose (rtl_dump_file);
1449 sprintf (seq, DUMPFILE_FORMAT, index);
1451 if (! dump_file[index].initialized)
1453 /* If we've not initialized the files, do so now. */
1454 if (graph_dump_format != no_graph
1455 && dump_file[index].graph_dump_p)
1457 dump_name = concat (seq, dump_file[index].extension, NULL);
1458 clean_graph_dump_file (dump_base_name, dump_name);
1461 dump_file[index].initialized = 1;
1467 dump_name = concat (dump_base_name, seq,
1468 dump_file[index].extension, NULL);
1470 rtl_dump_file = fopen (dump_name, open_arg);
1471 if (rtl_dump_file == NULL)
1472 fatal_error ("can't open %s: %m", dump_name);
1477 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1478 (*lang_hooks.decl_printable_name) (decl, 2),
1479 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1481 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1482 ? " (unlikely executed)"
1485 timevar_pop (TV_DUMP);
1489 /* Routine to close a dump file. */
1492 close_dump_file (enum dump_file_index index,
1493 void (*func) (FILE *, rtx),
1496 if (! rtl_dump_file)
1499 timevar_push (TV_DUMP);
1501 && graph_dump_format != no_graph
1502 && dump_file[index].graph_dump_p)
1507 sprintf (seq, DUMPFILE_FORMAT, index);
1508 suffix = concat (seq, dump_file[index].extension, NULL);
1509 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1514 func (rtl_dump_file, insns);
1516 fflush (rtl_dump_file);
1517 fclose (rtl_dump_file);
1519 rtl_dump_file = NULL;
1520 timevar_pop (TV_DUMP);
1523 /* Do any final processing required for the declarations in VEC, of
1524 which there are LEN. We write out inline functions and variables
1525 that have been deferred until this point, but which are required.
1526 Returns nonzero if anything was put out. */
1529 wrapup_global_declarations (tree *vec, int len)
1534 int output_something = 0;
1536 for (i = 0; i < len; i++)
1540 /* We're not deferring this any longer. Assignment is
1541 conditional to avoid needlessly dirtying PCH pages. */
1542 if (DECL_DEFER_OUTPUT (decl) != 0)
1543 DECL_DEFER_OUTPUT (decl) = 0;
1545 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1546 (*lang_hooks.finish_incomplete_decl) (decl);
1549 /* Now emit any global variables or functions that we have been
1550 putting off. We need to loop in case one of the things emitted
1551 here references another one which comes earlier in the list. */
1555 for (i = 0; i < len; i++)
1559 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1562 /* Don't write out static consts, unless we still need them.
1564 We also keep static consts if not optimizing (for debugging),
1565 unless the user specified -fno-keep-static-consts.
1566 ??? They might be better written into the debug information.
1567 This is possible when using DWARF.
1569 A language processor that wants static constants to be always
1570 written out (even if it is not used) is responsible for
1571 calling rest_of_decl_compilation itself. E.g. the C front-end
1572 calls rest_of_decl_compilation from finish_decl.
1573 One motivation for this is that is conventional in some
1574 environments to write things like:
1575 static const char rcsid[] = "... version string ...";
1576 intending to force the string to be in the executable.
1578 A language processor that would prefer to have unneeded
1579 static constants "optimized away" would just defer writing
1580 them out until here. E.g. C++ does this, because static
1581 constants are often defined in header files.
1583 ??? A tempting alternative (for both C and C++) would be
1584 to force a constant to be written if and only if it is
1585 defined in a main file, as opposed to an include file. */
1587 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1591 if (flag_unit_at_a_time
1592 && cgraph_varpool_node (decl)->finalized)
1594 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1595 && (TREE_USED (decl)
1596 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1598 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1600 else if (DECL_COMDAT (decl))
1602 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1603 && (optimize || !flag_keep_static_consts
1604 || DECL_ARTIFICIAL (decl)))
1610 rest_of_decl_compilation (decl, NULL, 1, 1);
1614 if (TREE_CODE (decl) == FUNCTION_DECL
1615 && DECL_INITIAL (decl) != 0
1616 && DECL_SAVED_INSNS (decl) != 0
1617 && DECL_SAVED_INSNS (decl)->saved_for_inline
1618 && (flag_keep_inline_functions
1619 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1620 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1623 output_inline_function (decl);
1628 output_something = 1;
1632 return output_something;
1635 /* Issue appropriate warnings for the global declarations in VEC (of
1636 which there are LEN). Output debugging information for them. */
1639 check_global_declarations (tree *vec, int len)
1644 for (i = 0; i < len; i++)
1648 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1649 && ! TREE_ASM_WRITTEN (decl))
1650 /* Cancel the RTL for this decl so that, if debugging info
1651 output for global variables is still to come,
1652 this one will be omitted. */
1653 SET_DECL_RTL (decl, NULL_RTX);
1655 /* Warn about any function
1656 declared static but not defined.
1657 We don't warn about variables,
1658 because many programs have static variables
1659 that exist only to get some text into the object file. */
1660 if (TREE_CODE (decl) == FUNCTION_DECL
1661 && (warn_unused_function
1662 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1663 && DECL_INITIAL (decl) == 0
1664 && DECL_EXTERNAL (decl)
1665 && ! DECL_ARTIFICIAL (decl)
1666 && ! TREE_PUBLIC (decl))
1668 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1669 pedwarn ("%J'%F' used but never defined", decl, decl);
1671 warning ("%J'%F' declared `static' but never defined", decl, decl);
1672 /* This symbol is effectively an "extern" declaration now. */
1673 TREE_PUBLIC (decl) = 1;
1674 assemble_external (decl);
1677 /* Warn about static fns or vars defined but not used. */
1678 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1679 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1680 && ! TREE_USED (decl)
1681 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1682 to handle multiple external decls in different scopes. */
1683 && ! TREE_USED (DECL_NAME (decl))
1684 && ! DECL_EXTERNAL (decl)
1685 && ! TREE_PUBLIC (decl)
1686 /* A volatile variable might be used in some non-obvious way. */
1687 && ! TREE_THIS_VOLATILE (decl)
1688 /* Global register variables must be declared to reserve them. */
1689 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1690 /* Otherwise, ask the language. */
1691 && (*lang_hooks.decls.warn_unused_global) (decl))
1692 warning ("%J'%D' defined but not used", decl, decl);
1694 /* Avoid confusing the debug information machinery when there are
1696 if (errorcount == 0 && sorrycount == 0)
1698 timevar_push (TV_SYMOUT);
1699 (*debug_hooks->global_decl) (decl);
1700 timevar_pop (TV_SYMOUT);
1705 /* Warn about a use of an identifier which was marked deprecated. */
1707 warn_deprecated_use (tree node)
1709 if (node == 0 || !warn_deprecated_decl)
1713 warning ("`%s' is deprecated (declared at %s:%d)",
1714 IDENTIFIER_POINTER (DECL_NAME (node)),
1715 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1716 else if (TYPE_P (node))
1718 const char *what = NULL;
1719 tree decl = TYPE_STUB_DECL (node);
1721 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1722 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1723 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1724 && DECL_NAME (TYPE_NAME (node)))
1725 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1730 warning ("`%s' is deprecated (declared at %s:%d)", what,
1731 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1733 warning ("`%s' is deprecated", what);
1736 warning ("type is deprecated (declared at %s:%d)",
1737 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1739 warning ("type is deprecated");
1743 /* Save the current INPUT_LOCATION on the top entry in the
1744 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1745 INPUT_LOCATION accordingly. */
1748 push_srcloc (const char *file, int line)
1750 struct file_stack *fs;
1752 fs = xmalloc (sizeof (struct file_stack));
1753 fs->location = input_location;
1754 fs->next = input_file_stack;
1755 input_filename = file;
1757 input_file_stack = fs;
1758 input_file_stack_tick++;
1761 /* Pop the top entry off the stack of presently open source files.
1762 Restore the INPUT_LOCATION from the new topmost entry on the
1768 struct file_stack *fs;
1770 fs = input_file_stack;
1771 input_location = fs->location;
1772 input_file_stack = fs->next;
1774 input_file_stack_tick++;
1777 /* Compile an entire translation unit. Write a file of assembly
1778 output and various debugging dumps. */
1783 /* Initialize yet another pass. */
1785 init_final (main_input_filename);
1786 coverage_init (aux_base_name);
1788 timevar_push (TV_PARSE);
1790 /* Call the parser, which parses the entire file (calling
1791 rest_of_compilation for each function). */
1792 (*lang_hooks.parse_file) (set_yydebug);
1794 /* In case there were missing block closers,
1795 get us back to the global binding level. */
1796 (*lang_hooks.clear_binding_stack) ();
1798 /* Compilation is now finished except for writing
1799 what's left of the symbol table output. */
1800 timevar_pop (TV_PARSE);
1802 if (flag_syntax_only)
1805 (*lang_hooks.decls.final_write_globals)();
1807 cgraph_varpool_assemble_pending_decls ();
1809 /* This must occur after the loop to output deferred functions.
1810 Else the coverage initializer would not be emitted if all the
1811 functions in this compilation unit were deferred. */
1814 /* Write out any pending weak symbol declarations. */
1818 /* Do dbx symbols. */
1819 timevar_push (TV_SYMOUT);
1821 #ifdef DWARF2_UNWIND_INFO
1822 if (dwarf2out_do_frame ())
1823 dwarf2out_frame_finish ();
1826 (*debug_hooks->finish) (main_input_filename);
1827 timevar_pop (TV_SYMOUT);
1829 /* Output some stuff at end of file if nec. */
1831 dw2_output_indirect_constants ();
1833 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1835 timevar_push (TV_DUMP);
1836 open_dump_file (DFI_bp, NULL);
1840 close_dump_file (DFI_bp, NULL, NULL_RTX);
1841 timevar_pop (TV_DUMP);
1844 targetm.asm_out.file_end ();
1846 /* Attach a special .ident directive to the end of the file to identify
1847 the version of GCC which compiled this code. The format of the .ident
1848 string is patterned after the ones produced by native SVR4 compilers. */
1851 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1852 IDENT_ASM_OP, version_string);
1855 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1857 timevar_push (TV_DUMP);
1858 dump_combine_total_stats (rtl_dump_file);
1859 close_dump_file (DFI_combine, NULL, NULL_RTX);
1860 timevar_pop (TV_DUMP);
1864 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1865 and TYPE_DECL nodes.
1867 This does nothing for local (non-static) variables, unless the
1868 variable is a register variable with an ASMSPEC. In that case, or
1869 if the variable is not an automatic, it sets up the RTL and
1870 outputs any assembler code (label definition, storage allocation
1871 and initialization).
1873 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1874 the assembler symbol name to be used. TOP_LEVEL is nonzero
1875 if this declaration is not within a function. */
1878 rest_of_decl_compilation (tree decl,
1879 const char *asmspec,
1883 /* We deferred calling assemble_alias so that we could collect
1884 other attributes such as visibility. Emit the alias now. */
1887 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1890 alias = TREE_VALUE (TREE_VALUE (alias));
1891 alias = get_identifier (TREE_STRING_POINTER (alias));
1892 assemble_alias (decl, alias);
1896 /* Forward declarations for nested functions are not "external",
1897 but we need to treat them as if they were. */
1898 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1899 || TREE_CODE (decl) == FUNCTION_DECL)
1901 timevar_push (TV_VARCONST);
1904 make_decl_rtl (decl, asmspec);
1906 /* Don't output anything when a tentative file-scope definition
1907 is seen. But at end of compilation, do output code for them. */
1908 if ((at_end || !DECL_DEFER_OUTPUT (decl)) && !DECL_EXTERNAL (decl))
1910 if (flag_unit_at_a_time && !cgraph_global_info_ready
1911 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1912 cgraph_varpool_finalize_decl (decl);
1914 assemble_variable (decl, top_level, at_end, 0);
1917 #ifdef ASM_FINISH_DECLARE_OBJECT
1918 if (decl == last_assemble_variable_decl)
1920 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1925 timevar_pop (TV_VARCONST);
1927 else if (DECL_REGISTER (decl) && asmspec != 0)
1929 if (decode_reg_name (asmspec) >= 0)
1931 SET_DECL_RTL (decl, NULL_RTX);
1932 make_decl_rtl (decl, asmspec);
1936 error ("invalid register name `%s' for register variable", asmspec);
1937 DECL_REGISTER (decl) = 0;
1942 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1943 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1944 && TREE_CODE (decl) == TYPE_DECL)
1946 timevar_push (TV_SYMOUT);
1947 dbxout_symbol (decl, 0);
1948 timevar_pop (TV_SYMOUT);
1951 #ifdef SDB_DEBUGGING_INFO
1952 else if (write_symbols == SDB_DEBUG && top_level
1953 && TREE_CODE (decl) == TYPE_DECL)
1955 timevar_push (TV_SYMOUT);
1956 sdbout_symbol (decl, 0);
1957 timevar_pop (TV_SYMOUT);
1960 #ifdef DWARF2_DEBUGGING_INFO
1961 else if ((write_symbols == DWARF2_DEBUG
1962 || write_symbols == VMS_AND_DWARF2_DEBUG)
1964 && TREE_CODE (decl) == TYPE_DECL)
1966 timevar_push (TV_SYMOUT);
1967 dwarf2out_decl (decl);
1968 timevar_pop (TV_SYMOUT);
1973 /* Called after finishing a record, union or enumeral type. */
1976 rest_of_type_compilation (
1977 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1978 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1982 tree type ATTRIBUTE_UNUSED,
1983 int toplev ATTRIBUTE_UNUSED
1987 /* Avoid confusing the debug information machinery when there are
1989 if (errorcount != 0 || sorrycount != 0)
1992 timevar_push (TV_SYMOUT);
1993 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1994 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1995 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
1997 #ifdef SDB_DEBUGGING_INFO
1998 if (write_symbols == SDB_DEBUG)
1999 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2001 #ifdef DWARF2_DEBUGGING_INFO
2002 if ((write_symbols == DWARF2_DEBUG
2003 || write_symbols == VMS_AND_DWARF2_DEBUG)
2005 dwarf2out_decl (TYPE_STUB_DECL (type));
2007 timevar_pop (TV_SYMOUT);
2010 /* Turn the RTL into assembly. */
2012 rest_of_handle_final (tree decl, rtx insns)
2014 timevar_push (TV_FINAL);
2019 /* Get the function's name, as described by its RTL. This may be
2020 different from the DECL_NAME name used in the source file. */
2022 x = DECL_RTL (decl);
2023 if (GET_CODE (x) != MEM)
2026 if (GET_CODE (x) != SYMBOL_REF)
2028 fnname = XSTR (x, 0);
2030 assemble_start_function (decl, fnname);
2031 final_start_function (insns, asm_out_file, optimize);
2032 final (insns, asm_out_file, optimize, 0);
2033 final_end_function ();
2035 #ifdef IA64_UNWIND_INFO
2036 /* ??? The IA-64 ".handlerdata" directive must be issued before
2037 the ".endp" directive that closes the procedure descriptor. */
2038 output_function_exception_table ();
2041 assemble_end_function (decl, fnname);
2043 #ifndef IA64_UNWIND_INFO
2044 /* Otherwise, it feels unclean to switch sections in the middle. */
2045 output_function_exception_table ();
2049 fflush (asm_out_file);
2051 /* Release all memory allocated by flow. */
2052 free_basic_block_vars (0);
2054 /* Release all memory held by regsets now. */
2055 regset_release_memory ();
2057 timevar_pop (TV_FINAL);
2063 /* Run delay slot optimization. */
2065 rest_of_handle_delay_slots (tree decl, rtx insns)
2067 timevar_push (TV_DBR_SCHED);
2068 open_dump_file (DFI_dbr, decl);
2070 dbr_schedule (insns, rtl_dump_file);
2072 close_dump_file (DFI_dbr, print_rtl, insns);
2073 timevar_pop (TV_DBR_SCHED);
2080 /* Convert register usage from flat register file usage to a stack
2083 rest_of_handle_stack_regs (tree decl, rtx insns)
2085 #if defined (HAVE_ATTR_length)
2086 /* If flow2 creates new instructions which need splitting
2087 and scheduling after reload is not done, they might not be
2088 splitten until final which doesn't allow splitting
2089 if HAVE_ATTR_length. */
2090 #ifdef INSN_SCHEDULING
2091 if (optimize && !flag_schedule_insns_after_reload)
2096 timevar_push (TV_SHORTEN_BRANCH);
2097 split_all_insns (1);
2098 timevar_pop (TV_SHORTEN_BRANCH);
2102 timevar_push (TV_REG_STACK);
2103 open_dump_file (DFI_stack, decl);
2105 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2107 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2108 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2109 && flag_reorder_blocks)
2111 reorder_basic_blocks ();
2112 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2116 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2117 timevar_pop (TV_REG_STACK);
2124 /* Machine independent reorg pass. */
2126 rest_of_handle_machine_reorg (tree decl, rtx insns)
2128 timevar_push (TV_MACH_DEP);
2129 open_dump_file (DFI_mach, decl);
2131 (*targetm.machine_dependent_reorg) ();
2133 close_dump_file (DFI_mach, print_rtl, insns);
2134 timevar_pop (TV_MACH_DEP);
2140 /* Run new register allocator. Return TRUE if we must exit
2141 rest_of_compilation upon return. */
2143 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2147 delete_trivially_dead_insns (insns, max_reg_num ());
2150 timevar_pop (TV_LOCAL_ALLOC);
2151 if (dump_file[DFI_lreg].enabled)
2153 timevar_push (TV_DUMP);
2155 close_dump_file (DFI_lreg, NULL, NULL);
2156 timevar_pop (TV_DUMP);
2159 /* XXX clean up the whole mess to bring live info in shape again. */
2160 timevar_push (TV_GLOBAL_ALLOC);
2161 open_dump_file (DFI_greg, decl);
2163 build_insn_chain (insns);
2164 failure = reload (insns, 0);
2166 timevar_pop (TV_GLOBAL_ALLOC);
2168 if (dump_file[DFI_greg].enabled)
2170 timevar_push (TV_DUMP);
2172 dump_global_regs (rtl_dump_file);
2174 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2175 timevar_pop (TV_DUMP);
2181 reload_completed = 1;
2187 /* Run old register allocator. Return TRUE if we must exit
2188 rest_of_compilation upon return. */
2190 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2194 /* Allocate the reg_renumber array. */
2195 allocate_reg_info (max_regno, FALSE, TRUE);
2197 /* And the reg_equiv_memory_loc array. */
2198 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2200 allocate_initial_values (reg_equiv_memory_loc);
2202 regclass (insns, max_reg_num (), rtl_dump_file);
2203 *rebuild_notes = local_alloc ();
2205 timevar_pop (TV_LOCAL_ALLOC);
2207 if (dump_file[DFI_lreg].enabled)
2209 timevar_push (TV_DUMP);
2211 dump_flow_info (rtl_dump_file);
2212 dump_local_alloc (rtl_dump_file);
2214 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2215 timevar_pop (TV_DUMP);
2220 timevar_push (TV_GLOBAL_ALLOC);
2221 open_dump_file (DFI_greg, decl);
2223 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2224 pass fixing up any insns that are invalid. */
2227 failure = global_alloc (rtl_dump_file);
2230 build_insn_chain (insns);
2231 failure = reload (insns, 0);
2234 timevar_pop (TV_GLOBAL_ALLOC);
2236 if (dump_file[DFI_greg].enabled)
2238 timevar_push (TV_DUMP);
2240 dump_global_regs (rtl_dump_file);
2242 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2243 timevar_pop (TV_DUMP);
2249 /* Run the regrename and cprop passes. */
2251 rest_of_handle_regrename (tree decl, rtx insns)
2253 timevar_push (TV_RENAME_REGISTERS);
2254 open_dump_file (DFI_rnreg, decl);
2256 if (flag_rename_registers)
2257 regrename_optimize ();
2258 if (flag_cprop_registers)
2259 copyprop_hardreg_forward ();
2261 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2262 timevar_pop (TV_RENAME_REGISTERS);
2265 /* Reorder basic blocks. */
2267 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2269 timevar_push (TV_REORDER_BLOCKS);
2270 open_dump_file (DFI_bbro, decl);
2272 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2273 splitting possibly introduced more crossjumping opportunities. */
2274 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2275 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2277 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2279 if (flag_reorder_blocks)
2280 reorder_basic_blocks ();
2281 if (flag_reorder_blocks
2282 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2283 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2285 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2286 timevar_pop (TV_REORDER_BLOCKS);
2289 #ifdef INSN_SCHEDULING
2290 /* Run instruction scheduler. */
2292 rest_of_handle_sched (tree decl, rtx insns)
2294 timevar_push (TV_SCHED);
2296 /* Print function header into sched dump now
2297 because doing the sched analysis makes some of the dump. */
2298 if (optimize > 0 && flag_schedule_insns)
2300 open_dump_file (DFI_sched, decl);
2302 /* Do control and data sched analysis,
2303 and write some of the results to dump file. */
2305 schedule_insns (rtl_dump_file);
2307 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2309 timevar_pop (TV_SCHED);
2314 /* Run second scheduling pass after reload. */
2316 rest_of_handle_sched2 (tree decl, rtx insns)
2318 timevar_push (TV_SCHED2);
2319 open_dump_file (DFI_sched2, decl);
2321 /* Do control and data sched analysis again,
2322 and write some more of the results to dump file. */
2324 split_all_insns (1);
2326 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2328 schedule_ebbs (rtl_dump_file);
2329 /* No liveness updating code yet, but it should be easy to do.
2330 reg-stack recompute the liveness when needed for now. */
2331 count_or_remove_death_notes (NULL, 1);
2332 cleanup_cfg (CLEANUP_EXPENSIVE);
2335 schedule_insns (rtl_dump_file);
2337 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2338 timevar_pop (TV_SCHED2);
2344 /* Register allocation pre-pass, to reduce number of moves necessary
2345 for two-address machines. */
2347 rest_of_handle_regmove (tree decl, rtx insns)
2349 timevar_push (TV_REGMOVE);
2350 open_dump_file (DFI_regmove, decl);
2352 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2354 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2355 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2356 timevar_pop (TV_REGMOVE);
2363 rest_of_handle_tracer (tree decl, rtx insns)
2365 timevar_push (TV_TRACER);
2366 open_dump_file (DFI_tracer, decl);
2368 dump_flow_info (rtl_dump_file);
2370 cleanup_cfg (CLEANUP_EXPENSIVE);
2371 reg_scan (insns, max_reg_num (), 0);
2372 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2373 timevar_pop (TV_TRACER);
2376 /* If-conversion and CFG cleanup. */
2378 rest_of_handle_if_conversion (tree decl, rtx insns)
2380 open_dump_file (DFI_ce1, decl);
2381 if (flag_if_conversion)
2383 timevar_push (TV_IFCVT);
2385 dump_flow_info (rtl_dump_file);
2386 cleanup_cfg (CLEANUP_EXPENSIVE);
2387 reg_scan (insns, max_reg_num (), 0);
2389 timevar_pop (TV_IFCVT);
2391 timevar_push (TV_JUMP);
2392 cleanup_cfg (CLEANUP_EXPENSIVE);
2393 reg_scan (insns, max_reg_num (), 0);
2394 timevar_pop (TV_JUMP);
2395 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2398 /* Rerun if-conversion, as combine may have simplified things enough
2399 to now meet sequence length restrictions. */
2401 rest_of_handle_if_after_combine (tree decl, rtx insns)
2403 timevar_push (TV_IFCVT);
2404 open_dump_file (DFI_ce2, decl);
2410 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2411 timevar_pop (TV_IFCVT);
2414 /* Do branch profiling and static profile estimation passes. */
2416 rest_of_handle_branch_prob (tree decl, rtx insns)
2420 timevar_push (TV_BRANCH_PROB);
2421 open_dump_file (DFI_bp, decl);
2422 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2425 /* Discover and record the loop depth at the head of each basic
2426 block. The loop infrastructure does the real job for us. */
2427 flow_loops_find (&loops, LOOP_TREE);
2430 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2432 /* Estimate using heuristics if no profiling info is available. */
2433 if (flag_guess_branch_prob)
2434 estimate_probability (&loops);
2436 flow_loops_free (&loops);
2437 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2438 timevar_pop (TV_BRANCH_PROB);
2441 /* Do control and data flow analysis; write some of the results to the
2444 rest_of_handle_cfg (tree decl, rtx insns)
2446 open_dump_file (DFI_cfg, decl);
2448 dump_flow_info (rtl_dump_file);
2450 cleanup_cfg (CLEANUP_EXPENSIVE
2451 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2453 /* It may make more sense to mark constant functions after dead code is
2454 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2455 may insert code making function non-constant, but we still must consider
2456 it as constant, otherwise -fbranch-probabilities will not read data back.
2458 life_analysis rarely eliminates modification of external memory.
2461 mark_constant_function ();
2463 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2466 /* Purge addressofs. */
2468 rest_of_handle_addressof (tree decl, rtx insns)
2470 open_dump_file (DFI_addressof, decl);
2472 purge_addressof (insns);
2473 if (optimize && purge_all_dead_edges (0))
2474 delete_unreachable_blocks ();
2475 reg_scan (insns, max_reg_num (), 1);
2477 close_dump_file (DFI_addressof, print_rtl, insns);
2480 /* We may have potential sibling or tail recursion sites. Select one
2481 (of possibly multiple) methods of performing the call. */
2483 rest_of_handle_sibling_calls (rtx insns)
2486 optimize_sibling_and_tail_recursive_calls ();
2488 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2489 free_bb_for_insn ();
2490 find_exception_handler_labels ();
2491 rebuild_jump_labels (insns);
2492 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2494 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2495 notes before simplifying cfg and we must do lowering after sibcall
2496 that unhides parts of RTL chain and cleans up the CFG.
2498 Until sibcall is replaced by tree-level optimizer, lets just
2499 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2500 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2501 if (GET_CODE (insn) == NOTE
2502 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2505 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2508 /* Perform jump bypassing and control flow optimizations. */
2510 rest_of_handle_jump_bypass (tree decl, rtx insns)
2512 timevar_push (TV_BYPASS);
2513 open_dump_file (DFI_bypass, decl);
2515 cleanup_cfg (CLEANUP_EXPENSIVE);
2517 if (bypass_jumps (rtl_dump_file))
2519 rebuild_jump_labels (insns);
2520 cleanup_cfg (CLEANUP_EXPENSIVE);
2521 delete_trivially_dead_insns (insns, max_reg_num ());
2524 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2525 timevar_pop (TV_BYPASS);
2529 #ifdef ENABLE_CHECKING
2530 verify_flow_info ();
2534 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2535 if we must exit rest_of_compilation upon return. */
2537 rest_of_handle_inlining (tree decl)
2544 /* If we are reconsidering an inline function at the end of
2545 compilation, skip the stuff for making it inline. */
2546 if (cfun->rtl_inline_init)
2548 cfun->rtl_inline_init = 1;
2550 /* If this is nested inside an inlined external function, pretend
2551 it was only declared. Since we cannot inline such functions,
2552 generating code for this one is not only not necessary but will
2553 confuse some debugging output writers. */
2554 for (parent = DECL_CONTEXT (current_function_decl);
2555 parent != NULL_TREE;
2556 parent = get_containing_scope (parent))
2557 if (TREE_CODE (parent) == FUNCTION_DECL
2558 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2560 DECL_INITIAL (decl) = 0;
2563 else if (TYPE_P (parent))
2564 /* A function in a local class should be treated normally. */
2567 /* If requested, consider whether to make this function inline. */
2568 if ((DECL_INLINE (decl) && !flag_no_inline)
2569 || flag_inline_functions)
2571 timevar_push (TV_INTEGRATION);
2572 lose = function_cannot_inline_p (decl);
2573 timevar_pop (TV_INTEGRATION);
2574 if (lose || ! optimize)
2576 if (warn_inline && lose && DECL_INLINE (decl))
2578 char *msg = concat ("%J", lose, NULL);
2579 warning (msg, decl);
2582 DECL_ABSTRACT_ORIGIN (decl) = 0;
2583 /* Don't really compile an extern inline function.
2584 If we can't make it inline, pretend
2585 it was only declared. */
2586 if (DECL_EXTERNAL (decl))
2588 DECL_INITIAL (decl) = 0;
2593 inlinable = DECL_INLINE (decl) = 1;
2596 insns = get_insns ();
2598 /* Dump the rtl code if we are dumping rtl. */
2600 if (open_dump_file (DFI_rtl, decl))
2602 if (DECL_SAVED_INSNS (decl) && DECL_SAVED_INSNS (decl)->saved_for_inline)
2603 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2604 close_dump_file (DFI_rtl, print_rtl, insns);
2607 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2608 sorts of eh initialization. Delay this until after the
2609 initial rtl dump so that we can see the original nesting. */
2610 convert_from_eh_region_ranges ();
2612 /* If function is inline, and we don't yet know whether to
2613 compile it by itself, defer decision till end of compilation.
2614 wrapup_global_declarations will (indirectly) call
2615 rest_of_compilation again for those functions that need to
2616 be output. Also defer those functions that we are supposed
2620 || (DECL_INLINE (decl)
2621 && flag_inline_functions
2622 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2623 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2624 && ! flag_keep_inline_functions)
2625 || DECL_EXTERNAL (decl))))
2626 DECL_DEFER_OUTPUT (decl) = 1;
2628 if (DECL_INLINE (decl))
2629 /* DWARF wants separate debugging info for abstract and
2630 concrete instances of all inline functions, including those
2631 declared inline but not inlined, and those inlined even
2632 though they weren't declared inline. Conveniently, that's
2633 what DECL_INLINE means at this point. */
2634 (*debug_hooks->deferred_inline_function) (decl);
2636 if (DECL_DEFER_OUTPUT (decl))
2638 /* If -Wreturn-type, we have to do a bit of compilation. We just
2639 want to call cleanup the cfg to figure out whether or not we can
2640 fall off the end of the function; we do the minimum amount of
2641 work necessary to make that safe. */
2642 if (warn_return_type)
2644 int saved_optimize = optimize;
2647 rebuild_jump_labels (insns);
2648 find_exception_handler_labels ();
2649 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2650 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2651 optimize = saved_optimize;
2653 /* CFG is no longer maintained up-to-date. */
2654 free_bb_for_insn ();
2657 set_nothrow_function_flags ();
2658 if (current_function_nothrow)
2659 /* Now we know that this can't throw; set the flag for the benefit
2660 of other functions later in this translation unit. */
2661 TREE_NOTHROW (current_function_decl) = 1;
2663 timevar_push (TV_INTEGRATION);
2664 save_for_inline (decl);
2665 timevar_pop (TV_INTEGRATION);
2666 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2670 /* If specified extern inline but we aren't inlining it, we are
2671 done. This goes for anything that gets here with DECL_EXTERNAL
2672 set, not just things with DECL_INLINE. */
2673 return (bool) DECL_EXTERNAL (decl);
2676 /* Rest of compilation helper to convert the rtl to SSA form. */
2678 rest_of_handle_ssa (tree decl, rtx insns)
2680 timevar_push (TV_TO_SSA);
2681 open_dump_file (DFI_ssa, decl);
2683 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2686 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2687 timevar_pop (TV_TO_SSA);
2689 /* Perform sparse conditional constant propagation, if requested. */
2692 timevar_push (TV_SSA_CCP);
2693 open_dump_file (DFI_ssa_ccp, decl);
2697 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2698 timevar_pop (TV_SSA_CCP);
2701 /* It would be useful to cleanup the CFG at this point, but block
2702 merging and possibly other transformations might leave a PHI
2703 node in the middle of a basic block, which is a strict no-no. */
2705 /* The SSA implementation uses basic block numbers in its phi
2706 nodes. Thus, changing the control-flow graph or the basic
2707 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2708 may cause problems. */
2712 /* Remove dead code. */
2714 timevar_push (TV_SSA_DCE);
2715 open_dump_file (DFI_ssa_dce, decl);
2717 insns = get_insns ();
2718 ssa_eliminate_dead_code ();
2720 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2721 timevar_pop (TV_SSA_DCE);
2724 /* Convert from SSA form. */
2726 timevar_push (TV_FROM_SSA);
2727 open_dump_file (DFI_ussa, decl);
2729 convert_from_ssa ();
2730 /* New registers have been created. Rescan their usage. */
2731 reg_scan (insns, max_reg_num (), 1);
2733 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2734 timevar_pop (TV_FROM_SSA);
2741 /* Try to identify useless null pointer tests and delete them. */
2743 rest_of_handle_null_pointer (tree decl, rtx insns)
2745 open_dump_file (DFI_null, decl);
2747 dump_flow_info (rtl_dump_file);
2749 if (delete_null_pointer_checks (insns))
2750 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2752 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2755 /* Try combining insns through substitution. */
2757 rest_of_handle_combine (tree decl, rtx insns)
2759 int rebuild_jump_labels_after_combine = 0;
2761 timevar_push (TV_COMBINE);
2762 open_dump_file (DFI_combine, decl);
2764 rebuild_jump_labels_after_combine
2765 = combine_instructions (insns, max_reg_num ());
2767 /* Combining insns may have turned an indirect jump into a
2768 direct jump. Rebuild the JUMP_LABEL fields of jumping
2770 if (rebuild_jump_labels_after_combine)
2772 timevar_push (TV_JUMP);
2773 rebuild_jump_labels (insns);
2774 timevar_pop (TV_JUMP);
2776 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2779 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2780 timevar_pop (TV_COMBINE);
2785 /* Perform life analysis. */
2787 rest_of_handle_life (tree decl, rtx insns)
2789 open_dump_file (DFI_life, decl);
2792 #ifdef ENABLE_CHECKING
2793 verify_flow_info ();
2795 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2797 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2798 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2799 timevar_pop (TV_FLOW);
2801 if (warn_uninitialized)
2803 uninitialized_vars_warning (DECL_INITIAL (decl));
2805 setjmp_args_warning ();
2810 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2812 /* Insns were inserted, and possibly pseudos created, so
2813 things might look a bit different. */
2814 insns = get_insns ();
2815 allocate_reg_life_data ();
2816 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2817 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2823 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2828 /* Perform common subexpression elimination. Nonzero value from
2829 `cse_main' means that jumps were simplified and some code may now
2830 be unreachable, so do jump optimization again. */
2832 rest_of_handle_cse (tree decl, rtx insns)
2836 open_dump_file (DFI_cse, decl);
2838 dump_flow_info (rtl_dump_file);
2839 timevar_push (TV_CSE);
2841 reg_scan (insns, max_reg_num (), 1);
2843 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2845 rebuild_jump_labels (insns);
2846 if (purge_all_dead_edges (0))
2847 delete_unreachable_blocks ();
2849 delete_trivially_dead_insns (insns, max_reg_num ());
2851 /* If we are not running more CSE passes, then we are no longer
2852 expecting CSE to be run. But always rerun it in a cheap mode. */
2853 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2855 if (tem || optimize > 1)
2856 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2857 /* Try to identify useless null pointer tests and delete them. */
2858 if (flag_delete_null_pointer_checks)
2860 timevar_push (TV_JUMP);
2862 if (delete_null_pointer_checks (insns))
2863 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2864 timevar_pop (TV_JUMP);
2867 /* The second pass of jump optimization is likely to have
2868 removed a bunch more instructions. */
2869 renumber_insns (rtl_dump_file);
2871 timevar_pop (TV_CSE);
2872 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2875 /* Run second CSE pass after loop optimizations. */
2877 rest_of_handle_cse2 (tree decl, rtx insns)
2881 timevar_push (TV_CSE2);
2882 open_dump_file (DFI_cse2, decl);
2884 dump_flow_info (rtl_dump_file);
2885 /* CFG is no longer maintained up-to-date. */
2886 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2887 purge_all_dead_edges (0);
2888 delete_trivially_dead_insns (insns, max_reg_num ());
2892 timevar_push (TV_JUMP);
2893 rebuild_jump_labels (insns);
2894 cleanup_cfg (CLEANUP_EXPENSIVE);
2895 timevar_pop (TV_JUMP);
2897 reg_scan (insns, max_reg_num (), 0);
2898 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2900 timevar_pop (TV_CSE2);
2903 /* Perform global cse. */
2905 rest_of_handle_gcse (tree decl, rtx insns)
2907 int save_csb, save_cfj;
2910 timevar_push (TV_GCSE);
2911 open_dump_file (DFI_gcse, decl);
2913 tem = gcse_main (insns, rtl_dump_file);
2914 rebuild_jump_labels (insns);
2915 delete_trivially_dead_insns (insns, max_reg_num ());
2917 save_csb = flag_cse_skip_blocks;
2918 save_cfj = flag_cse_follow_jumps;
2919 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2921 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2922 if (current_function_calls_constant_p)
2923 purge_builtin_constant_p ();
2925 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2927 if (flag_expensive_optimizations)
2929 timevar_push (TV_CSE);
2930 reg_scan (insns, max_reg_num (), 1);
2931 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2932 purge_all_dead_edges (0);
2933 delete_trivially_dead_insns (insns, max_reg_num ());
2934 timevar_pop (TV_CSE);
2935 cse_not_expected = !flag_rerun_cse_after_loop;
2938 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2939 things up. Then possibly re-run CSE again. */
2943 timevar_push (TV_JUMP);
2944 rebuild_jump_labels (insns);
2945 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2946 timevar_pop (TV_JUMP);
2948 if (flag_expensive_optimizations)
2950 timevar_push (TV_CSE);
2951 reg_scan (insns, max_reg_num (), 1);
2952 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2953 purge_all_dead_edges (0);
2954 delete_trivially_dead_insns (insns, max_reg_num ());
2955 timevar_pop (TV_CSE);
2959 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2960 timevar_pop (TV_GCSE);
2963 flag_cse_skip_blocks = save_csb;
2964 flag_cse_follow_jumps = save_cfj;
2965 #ifdef ENABLE_CHECKING
2966 verify_flow_info ();
2970 /* Move constant computations out of loops. */
2972 rest_of_handle_loop_optimize (tree decl, rtx insns)
2974 int do_unroll, do_prefetch;
2976 timevar_push (TV_LOOP);
2977 delete_dead_jumptables ();
2978 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2979 open_dump_file (DFI_loop, decl);
2981 /* CFG is no longer maintained up-to-date. */
2982 free_bb_for_insn ();
2984 if (flag_unroll_loops)
2985 do_unroll = 0; /* Having two unrollers is useless. */
2987 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2988 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2990 if (flag_rerun_loop_opt)
2992 cleanup_barriers ();
2994 /* We only want to perform unrolling once. */
2995 loop_optimize (insns, rtl_dump_file, do_unroll);
2998 /* The first call to loop_optimize makes some instructions
2999 trivially dead. We delete those instructions now in the
3000 hope that doing so will make the heuristics in loop work
3001 better and possibly speed up compilation. */
3002 delete_trivially_dead_insns (insns, max_reg_num ());
3004 /* The regscan pass is currently necessary as the alias
3005 analysis code depends on this information. */
3006 reg_scan (insns, max_reg_num (), 1);
3008 cleanup_barriers ();
3009 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3011 /* Loop can create trivially dead instructions. */
3012 delete_trivially_dead_insns (insns, max_reg_num ());
3013 close_dump_file (DFI_loop, print_rtl, insns);
3014 timevar_pop (TV_LOOP);
3015 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3020 /* Perform loop optimizations. It might be better to do them a bit
3021 sooner, but we want the profile feedback to work more
3024 rest_of_handle_loop2 (tree decl, rtx insns)
3026 struct loops *loops;
3027 timevar_push (TV_LOOP);
3028 open_dump_file (DFI_loop2, decl);
3030 dump_flow_info (rtl_dump_file);
3032 loops = loop_optimizer_init (rtl_dump_file);
3036 /* The optimizations: */
3037 if (flag_unswitch_loops)
3038 unswitch_loops (loops);
3040 if (flag_peel_loops || flag_unroll_loops)
3041 unroll_and_peel_loops (loops,
3042 (flag_peel_loops ? UAP_PEEL : 0) |
3043 (flag_unroll_loops ? UAP_UNROLL : 0) |
3044 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3046 loop_optimizer_finalize (loops, rtl_dump_file);
3049 cleanup_cfg (CLEANUP_EXPENSIVE);
3050 delete_trivially_dead_insns (insns, max_reg_num ());
3051 reg_scan (insns, max_reg_num (), 0);
3053 dump_flow_info (rtl_dump_file);
3054 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3055 timevar_pop (TV_LOOP);
3059 /* This is called from finish_function (within langhooks.parse_file)
3060 after each top-level definition is parsed.
3061 It is supposed to compile that function or variable
3062 and output the assembler code for it.
3063 After we return, the tree storage is freed. */
3066 rest_of_compilation (tree decl)
3069 int rebuild_label_notes_after_reload;
3071 timevar_push (TV_REST_OF_COMPILATION);
3073 /* Register rtl specific functions for cfg. */
3074 rtl_register_cfg_hooks ();
3076 /* Now that we're out of the frontend, we shouldn't have any more
3077 CONCATs anywhere. */
3078 generating_concat_p = 0;
3080 /* When processing delayed functions, prepare_function_start() won't
3081 have been run to re-initialize it. */
3082 cse_not_expected = ! optimize;
3084 /* First, make sure that NOTE_BLOCK is set correctly for each
3085 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3086 if (!cfun->x_whole_function_mode_p)
3089 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3090 tree in sensible shape. So, we just recalculate it here. */
3091 if (cfun->x_whole_function_mode_p)
3096 if (rest_of_handle_inlining (decl))
3097 goto exit_rest_of_compilation;
3099 /* If we're emitting a nested function, make sure its parent gets
3100 emitted as well. Doing otherwise confuses debug info. */
3103 for (parent = DECL_CONTEXT (current_function_decl);
3104 parent != NULL_TREE;
3105 parent = get_containing_scope (parent))
3106 if (TREE_CODE (parent) == FUNCTION_DECL)
3107 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3110 /* We are now committed to emitting code for this function. Do any
3111 preparation, such as emitting abstract debug info for the inline
3112 before it gets mangled by optimization. */
3113 if (DECL_INLINE (decl))
3114 (*debug_hooks->outlining_inline_function) (decl);
3116 /* Remove any notes we don't need. That will make iterating
3117 over the instruction sequence faster, and allow the garbage
3118 collector to reclaim the memory used by the notes. */
3119 remove_unnecessary_notes ();
3124 /* Initialize some variables used by the optimizers. */
3125 init_function_for_compilation ();
3127 if (! DECL_DEFER_OUTPUT (decl))
3128 TREE_ASM_WRITTEN (decl) = 1;
3130 /* Now that integrate will no longer see our rtl, we need not
3131 distinguish between the return value of this function and the
3132 return value of called functions. Also, we can remove all SETs
3133 of subregs of hard registers; they are only here because of
3134 integrate. Also, we can now initialize pseudos intended to
3135 carry magic hard reg data throughout the function. */
3136 rtx_equal_function_value_matters = 0;
3137 purge_hard_subreg_sets (get_insns ());
3139 /* Early return if there were errors. We can run afoul of our
3140 consistency checks, and there's not really much point in fixing them.
3141 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3142 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3143 || errorcount || sorrycount)
3144 goto exit_rest_of_compilation;
3146 timevar_push (TV_JUMP);
3147 open_dump_file (DFI_sibling, decl);
3148 insns = get_insns ();
3149 rebuild_jump_labels (insns);
3150 find_exception_handler_labels ();
3151 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3153 delete_unreachable_blocks ();
3155 /* We have to issue these warnings now already, because CFG cleanups
3156 further down may destroy the required information. */
3157 check_function_return_warnings ();
3159 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3160 if (flag_guess_branch_prob)
3162 timevar_push (TV_BRANCH_PROB);
3163 note_prediction_to_br_prob ();
3164 timevar_pop (TV_BRANCH_PROB);
3167 if (flag_optimize_sibling_calls)
3168 rest_of_handle_sibling_calls (insns);
3170 timevar_pop (TV_JUMP);
3172 insn_locators_initialize ();
3173 /* Complete generation of exception handling code. */
3176 timevar_push (TV_JUMP);
3177 open_dump_file (DFI_eh, decl);
3179 finish_eh_generation ();
3181 close_dump_file (DFI_eh, print_rtl, get_insns ());
3182 timevar_pop (TV_JUMP);
3185 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3186 generation, which might create new sets. */
3187 emit_initial_value_sets ();
3190 /* If we are doing position-independent code generation, now
3191 is the time to output special prologues and epilogues.
3192 We do not want to do this earlier, because it just clutters
3193 up inline functions with meaningless insns. */
3198 insns = get_insns ();
3200 /* Copy any shared structure that should not be shared. */
3201 unshare_all_rtl (current_function_decl, insns);
3203 #ifdef SETJMP_VIA_SAVE_AREA
3204 /* This must be performed before virtual register instantiation.
3205 Please be aware the everything in the compiler that can look
3206 at the RTL up to this point must understand that REG_SAVE_AREA
3207 is just like a use of the REG contained inside. */
3208 if (current_function_calls_alloca)
3209 optimize_save_area_alloca (insns);
3212 /* Instantiate all virtual registers. */
3213 instantiate_virtual_regs (current_function_decl, insns);
3215 open_dump_file (DFI_jump, decl);
3217 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3218 are initialized and to compute whether control can drop off the end
3221 timevar_push (TV_JUMP);
3222 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3223 before jump optimization switches branch directions. */
3224 if (flag_guess_branch_prob)
3225 expected_value_to_br_prob ();
3227 reg_scan (insns, max_reg_num (), 0);
3228 rebuild_jump_labels (insns);
3229 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3230 delete_trivially_dead_insns (insns, max_reg_num ());
3232 dump_flow_info (rtl_dump_file);
3233 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3234 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3238 free_bb_for_insn ();
3239 copy_loop_headers (insns);
3240 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3242 purge_line_number_notes (insns);
3244 timevar_pop (TV_JUMP);
3245 close_dump_file (DFI_jump, print_rtl, insns);
3247 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3248 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3249 goto exit_rest_of_compilation;
3251 /* Long term, this should probably move before the jump optimizer too,
3252 but I didn't want to disturb the rtl_dump_and_exit and related
3253 stuff at this time. */
3254 if (optimize > 0 && flag_ssa)
3255 insns = rest_of_handle_ssa (decl, insns);
3257 timevar_push (TV_JUMP);
3260 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3262 if (flag_delete_null_pointer_checks)
3263 rest_of_handle_null_pointer (decl, insns);
3265 /* Jump optimization, and the removal of NULL pointer checks, may
3266 have reduced the number of instructions substantially. CSE, and
3267 future passes, allocate arrays whose dimensions involve the
3268 maximum instruction UID, so if we can reduce the maximum UID
3269 we'll save big on memory. */
3270 renumber_insns (rtl_dump_file);
3271 timevar_pop (TV_JUMP);
3273 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3278 rest_of_handle_cse (decl, insns);
3280 rest_of_handle_addressof (decl, insns);
3287 rest_of_handle_gcse (decl, insns);
3289 if (flag_loop_optimize)
3290 rest_of_handle_loop_optimize (decl, insns);
3293 rest_of_handle_jump_bypass (decl, insns);
3296 timevar_push (TV_FLOW);
3298 rest_of_handle_cfg (decl, insns);
3301 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3302 rest_of_handle_branch_prob (decl, insns);
3305 rest_of_handle_if_conversion (decl, insns);
3308 rest_of_handle_tracer (decl, insns);
3311 && (flag_unswitch_loops
3313 || flag_unroll_loops))
3314 rest_of_handle_loop2 (decl, insns);
3316 if (flag_rerun_cse_after_loop)
3317 rest_of_handle_cse2 (decl, insns);
3319 cse_not_expected = 1;
3321 rest_of_handle_life (decl, insns);
3324 rest_of_handle_combine (decl, insns);
3326 if (flag_if_conversion)
3327 rest_of_handle_if_after_combine (decl, insns);
3329 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3330 rest_of_handle_regmove (decl, insns);
3332 /* Do unconditional splitting before register allocation to allow machine
3333 description to add extra information not needed previously. */
3334 split_all_insns (1);
3336 #ifdef OPTIMIZE_MODE_SWITCHING
3337 timevar_push (TV_MODE_SWITCH);
3340 optimize_mode_switching (NULL);
3343 timevar_pop (TV_MODE_SWITCH);
3346 /* Any of the several passes since flow1 will have munged register
3347 lifetime data a bit. We need it to be up to date for scheduling
3348 (see handling of reg_known_equiv in init_alias_analysis). */
3349 recompute_reg_usage (insns, !optimize_size);
3351 #ifdef INSN_SCHEDULING
3352 rest_of_handle_sched (decl, insns);
3355 /* Determine if the current function is a leaf before running reload
3356 since this can impact optimizations done by the prologue and
3357 epilogue thus changing register elimination offsets. */
3358 current_function_is_leaf = leaf_function_p ();
3360 timevar_push (TV_LOCAL_ALLOC);
3361 open_dump_file (DFI_lreg, decl);
3363 if (flag_new_regalloc)
3365 if (rest_of_handle_new_regalloc (decl, insns,
3366 &rebuild_label_notes_after_reload))
3367 goto exit_rest_of_compilation;
3371 if (rest_of_handle_old_regalloc (decl, insns,
3372 &rebuild_label_notes_after_reload))
3373 goto exit_rest_of_compilation;
3378 open_dump_file (DFI_postreload, decl);
3380 /* Do a very simple CSE pass over just the hard registers. */
3383 timevar_push (TV_RELOAD_CSE_REGS);
3384 reload_cse_regs (insns);
3385 timevar_pop (TV_RELOAD_CSE_REGS);
3388 /* Register allocation and reloading may have turned an indirect jump into
3389 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3390 jumping instructions. */
3391 if (rebuild_label_notes_after_reload)
3393 timevar_push (TV_JUMP);
3395 rebuild_jump_labels (insns);
3396 purge_all_dead_edges (0);
3398 timevar_pop (TV_JUMP);
3401 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3403 /* Re-create the death notes which were deleted during reload. */
3404 timevar_push (TV_FLOW2);
3405 open_dump_file (DFI_flow2, decl);
3407 #ifdef ENABLE_CHECKING
3408 verify_flow_info ();
3411 /* If optimizing, then go ahead and split insns now. */
3415 split_all_insns (0);
3417 if (flag_branch_target_load_optimize)
3419 open_dump_file (DFI_branch_target_load, decl);
3421 branch_target_load_optimize (insns, false);
3423 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3429 cleanup_cfg (CLEANUP_EXPENSIVE);
3431 /* On some machines, the prologue and epilogue code, or parts thereof,
3432 can be represented as RTL. Doing so lets us schedule insns between
3433 it and the rest of the code and also allows delayed branch
3434 scheduling to operate in the epilogue. */
3435 thread_prologue_and_epilogue_insns (insns);
3436 epilogue_completed = 1;
3440 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3441 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3442 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3444 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3445 even for machines with possibly nonzero RETURN_POPS_ARGS
3446 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3447 push instructions will have popping returns. */
3448 #ifndef PUSH_ROUNDING
3449 if (!ACCUMULATE_OUTGOING_ARGS)
3451 combine_stack_adjustments ();
3456 flow2_completed = 1;
3458 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3459 timevar_pop (TV_FLOW2);
3461 #ifdef HAVE_peephole2
3462 if (optimize > 0 && flag_peephole2)
3464 timevar_push (TV_PEEPHOLE2);
3465 open_dump_file (DFI_peephole2, decl);
3467 peephole2_optimize (rtl_dump_file);
3469 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3470 timevar_pop (TV_PEEPHOLE2);
3476 if (flag_rename_registers || flag_cprop_registers)
3477 rest_of_handle_regrename (decl, insns);
3479 rest_of_handle_reorder_blocks (decl, insns);
3482 if (flag_if_conversion2)
3484 timevar_push (TV_IFCVT2);
3485 open_dump_file (DFI_ce3, decl);
3489 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3490 timevar_pop (TV_IFCVT2);
3493 if (flag_branch_target_load_optimize2)
3495 /* Leave this a warning for now so that it is possible to experiment
3496 with running this pass twice. In 3.6, we should either make this
3497 an error, or use separate dump files. */
3498 if (flag_branch_target_load_optimize)
3499 warning ("branch target register load optimization is not intended "
3502 open_dump_file (DFI_branch_target_load, decl);
3504 branch_target_load_optimize (insns, true);
3506 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3511 #ifdef INSN_SCHEDULING
3512 if (optimize > 0 && flag_schedule_insns_after_reload)
3513 rest_of_handle_sched2 (decl, insns);
3516 #ifdef LEAF_REGISTERS
3517 current_function_uses_only_leaf_regs
3518 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3522 rest_of_handle_stack_regs (decl, insns);
3525 compute_alignments ();
3527 /* CFG is no longer maintained up-to-date. */
3528 free_bb_for_insn ();
3530 if (targetm.machine_dependent_reorg != 0)
3531 rest_of_handle_machine_reorg (decl, insns);
3533 purge_line_number_notes (insns);
3534 cleanup_barriers ();
3537 if (optimize > 0 && flag_delayed_branch)
3538 rest_of_handle_delay_slots (decl, insns);
3541 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3542 timevar_push (TV_SHORTEN_BRANCH);
3543 split_all_insns_noflow ();
3544 timevar_pop (TV_SHORTEN_BRANCH);
3547 convert_to_eh_region_ranges ();
3549 /* Shorten branches. */
3550 timevar_push (TV_SHORTEN_BRANCH);
3551 shorten_branches (get_insns ());
3552 timevar_pop (TV_SHORTEN_BRANCH);
3554 set_nothrow_function_flags ();
3555 if (current_function_nothrow)
3556 /* Now we know that this can't throw; set the flag for the benefit
3557 of other functions later in this translation unit. */
3558 TREE_NOTHROW (current_function_decl) = 1;
3560 rest_of_handle_final (decl, insns);
3562 /* Write DBX symbols if requested. */
3564 /* Note that for those inline functions where we don't initially
3565 know for certain that we will be generating an out-of-line copy,
3566 the first invocation of this routine (rest_of_compilation) will
3567 skip over this code by doing a `goto exit_rest_of_compilation;'.
3568 Later on, wrapup_global_declarations will (indirectly) call
3569 rest_of_compilation again for those inline functions that need
3570 to have out-of-line copies generated. During that call, we
3571 *will* be routed past here. */
3573 timevar_push (TV_SYMOUT);
3574 (*debug_hooks->function_decl) (decl);
3575 timevar_pop (TV_SYMOUT);
3577 exit_rest_of_compilation:
3579 coverage_end_function ();
3581 /* In case the function was not output,
3582 don't leave any temporary anonymous types
3583 queued up for sdb output. */
3584 #ifdef SDB_DEBUGGING_INFO
3585 if (write_symbols == SDB_DEBUG)
3586 sdbout_types (NULL_TREE);
3589 reload_completed = 0;
3590 epilogue_completed = 0;
3591 flow2_completed = 0;
3594 timevar_push (TV_FINAL);
3596 /* Clear out the insn_length contents now that they are no
3598 init_insn_lengths ();
3600 /* Show no temporary slots allocated. */
3603 free_basic_block_vars (0);
3604 free_bb_for_insn ();
3606 timevar_pop (TV_FINAL);
3608 if ((*targetm.binds_local_p) (current_function_decl))
3610 int pref = cfun->preferred_stack_boundary;
3611 if (cfun->recursive_call_emit
3612 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3613 pref = cfun->stack_alignment_needed;
3614 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3618 /* Make sure volatile mem refs aren't considered valid operands for
3619 arithmetic insns. We must call this here if this is a nested inline
3620 function, since the above code leaves us in the init_recog state
3621 (from final.c), and the function context push/pop code does not
3622 save/restore volatile_ok.
3624 ??? Maybe it isn't necessary for expand_start_function to call this
3625 anymore if we do it here? */
3627 init_recog_no_volatile ();
3629 /* We're done with this function. Free up memory if we can. */
3630 free_after_parsing (cfun);
3631 if (! DECL_DEFER_OUTPUT (decl))
3633 free_after_compilation (cfun);
3634 DECL_SAVED_INSNS (decl) = 0;
3640 timevar_pop (TV_REST_OF_COMPILATION);
3643 /* Display help for target options. */
3645 display_target_options (void)
3648 static bool displayed = false;
3650 /* Avoid double printing for --help --target-help. */
3656 if (ARRAY_SIZE (target_switches) > 1
3657 #ifdef TARGET_OPTIONS
3658 || ARRAY_SIZE (target_options) > 1
3666 printf (_("\nTarget specific options:\n"));
3668 for (i = ARRAY_SIZE (target_switches); i--;)
3670 const char *option = target_switches[i].name;
3671 const char *description = target_switches[i].description;
3673 if (option == NULL || *option == 0)
3675 else if (description == NULL)
3680 printf (_(" -m%-23s [undocumented]\n"), option);
3682 else if (*description != 0)
3683 doc += printf (" -m%-23s %s\n", option, _(description));
3686 #ifdef TARGET_OPTIONS
3687 for (i = ARRAY_SIZE (target_options); i--;)
3689 const char *option = target_options[i].prefix;
3690 const char *description = target_options[i].description;
3692 if (option == NULL || *option == 0)
3694 else if (description == NULL)
3699 printf (_(" -m%-23s [undocumented]\n"), option);
3701 else if (*description != 0)
3702 doc += printf (" -m%-23s %s\n", option, _(description));
3708 printf (_("\nThere are undocumented target specific options as well.\n"));
3710 printf (_(" They exist, but they are not documented.\n"));
3715 /* Parse a -d... command line switch. */
3718 decode_d_option (const char *arg)
3726 for (i = 0; i < (int) DFI_MAX; ++i)
3727 dump_file[i].enabled = 1;
3733 flag_print_asm_name = 1;
3736 flag_dump_rtl_in_asm = 1;
3737 flag_print_asm_name = 1;
3740 graph_dump_format = vcg;
3743 rtl_dump_and_exit = 1;
3748 case 'D': /* These are handled by the preprocessor. */
3752 setup_core_dumping();
3757 for (i = 0; i < (int) DFI_MAX; ++i)
3758 if (c == dump_file[i].debug_switch)
3760 dump_file[i].enabled = 1;
3765 warning ("unrecognized gcc debugging option: %c", c);
3770 /* Indexed by enum debug_info_type. */
3771 const char *const debug_type_names[] =
3773 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3776 /* Decode -m switches. */
3777 /* Decode the switch -mNAME. */
3780 set_target_switch (const char *name)
3783 int valid_target_option = 0;
3785 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3786 if (!strcmp (target_switches[j].name, name))
3788 if (target_switches[j].value < 0)
3789 target_flags &= ~-target_switches[j].value;
3791 target_flags |= target_switches[j].value;
3794 if (target_switches[j].value < 0)
3795 target_flags_explicit |= -target_switches[j].value;
3797 target_flags_explicit |= target_switches[j].value;
3799 valid_target_option = 1;
3802 #ifdef TARGET_OPTIONS
3803 if (!valid_target_option)
3804 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3806 int len = strlen (target_options[j].prefix);
3807 if (target_options[j].value)
3809 if (!strcmp (target_options[j].prefix, name))
3811 *target_options[j].variable = target_options[j].value;
3812 valid_target_option = 1;
3817 if (!strncmp (target_options[j].prefix, name, len))
3819 *target_options[j].variable = name + len;
3820 valid_target_option = 1;
3826 if (!valid_target_option)
3827 error ("invalid option `%s'", name);
3830 /* Print version information to FILE.
3831 Each line begins with INDENT (for the case where FILE is the
3832 assembler output file). */
3835 print_version (FILE *file, const char *indent)
3838 #define __VERSION__ "[?]"
3842 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3844 "%s%s%s version %s (%s) compiled by CC.\n"
3846 , indent, *indent != 0 ? " " : "",
3847 lang_hooks.name, version_string, TARGET_NAME,
3848 indent, __VERSION__);
3849 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3850 indent, *indent != 0 ? " " : "",
3851 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3854 /* Print an option value and return the adjusted position in the line.
3855 ??? We don't handle error returns from fprintf (disk full); presumably
3856 other code will catch a disk full though. */
3859 print_single_switch (FILE *file, int pos, int max,
3860 const char *indent, const char *sep, const char *term,
3861 const char *type, const char *name)
3863 /* The ultrix fprintf returns 0 on success, so compute the result we want
3864 here since we need it for the following test. */
3865 int len = strlen (sep) + strlen (type) + strlen (name);
3870 fprintf (file, "%s", term);
3875 fprintf (file, "%s", indent);
3876 pos = strlen (indent);
3878 fprintf (file, "%s%s%s", sep, type, name);
3883 /* Print active target switches to FILE.
3884 POS is the current cursor position and MAX is the size of a "line".
3885 Each line begins with INDENT and ends with TERM.
3886 Each switch is separated from the next by SEP. */
3889 print_switch_values (FILE *file, int pos, int max,
3890 const char *indent, const char *sep, const char *term)
3895 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3896 that it can be printed below. This helps reproducibility. */
3899 /* Print the options as passed. */
3900 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3901 _("options passed: "), "");
3903 for (p = &save_argv[1]; *p != NULL; p++)
3907 if (strcmp (*p, "-o") == 0)
3913 if (strcmp (*p, "-quiet") == 0)
3915 if (strcmp (*p, "-version") == 0)
3920 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3923 fprintf (file, "%s", term);
3925 /* Print the -f and -m options that have been enabled.
3926 We don't handle language specific options but printing argv
3929 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3930 _("options enabled: "), "");
3932 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3933 if (*f_options[j].variable == f_options[j].on_value)
3934 pos = print_single_switch (file, pos, max, indent, sep, term,
3935 "-f", f_options[j].string);
3937 /* Print target specific options. */
3939 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3940 if (target_switches[j].name[0] != '\0'
3941 && target_switches[j].value > 0
3942 && ((target_switches[j].value & target_flags)
3943 == target_switches[j].value))
3945 pos = print_single_switch (file, pos, max, indent, sep, term,
3946 "-m", target_switches[j].name);
3949 #ifdef TARGET_OPTIONS
3950 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3951 if (*target_options[j].variable != NULL)
3954 sprintf (prefix, "-m%s", target_options[j].prefix);
3955 pos = print_single_switch (file, pos, max, indent, sep, term,
3956 prefix, *target_options[j].variable);
3960 fprintf (file, "%s", term);
3963 /* Open assembly code output file. Do this even if -fsyntax-only is
3964 on, because then the driver will have provided the name of a
3965 temporary file or bit bucket for us. NAME is the file specified on
3966 the command line, possibly NULL. */
3968 init_asm_output (const char *name)
3970 if (name == NULL && asm_file_name == 0)
3971 asm_out_file = stdout;
3974 if (asm_file_name == 0)
3976 int len = strlen (dump_base_name);
3977 char *dumpname = xmalloc (len + 6);
3978 memcpy (dumpname, dump_base_name, len + 1);
3979 strip_off_ending (dumpname, len);
3980 strcat (dumpname, ".s");
3981 asm_file_name = dumpname;
3983 if (!strcmp (asm_file_name, "-"))
3984 asm_out_file = stdout;
3986 asm_out_file = fopen (asm_file_name, "w+");
3987 if (asm_out_file == 0)
3988 fatal_error ("can't open %s for writing: %m", asm_file_name);
3991 #ifdef IO_BUFFER_SIZE
3992 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
3993 _IOFBF, IO_BUFFER_SIZE);
3996 if (!flag_syntax_only)
3998 targetm.asm_out.file_start ();
4000 #ifdef ASM_COMMENT_START
4001 if (flag_verbose_asm)
4003 /* Print the list of options in effect. */
4004 print_version (asm_out_file, ASM_COMMENT_START);
4005 print_switch_values (asm_out_file, 0, MAX_LINE,
4006 ASM_COMMENT_START, " ", "\n");
4007 /* Add a blank line here so it appears in assembler output but not
4009 fprintf (asm_out_file, "\n");
4015 /* Default tree printer. Handles declarations only. */
4017 default_tree_printer (pretty_printer * pp, text_info *text)
4019 switch (*text->format_spec)
4025 tree t = va_arg (*text->args_ptr, tree);
4026 const char *n = DECL_NAME (t)
4027 ? (*lang_hooks.decl_printable_name) (t, 2)
4038 /* Initialization of the front end environment, before command line
4039 options are parsed. Signal handlers, internationalization etc.
4040 ARGV0 is main's argv[0]. */
4042 general_init (const char *argv0)
4046 p = argv0 + strlen (argv0);
4047 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4051 xmalloc_set_program_name (progname);
4055 gcc_init_libintl ();
4057 /* Initialize the diagnostics reporting machinery, so option parsing
4058 can give warnings and errors. */
4059 diagnostic_initialize (global_dc);
4060 /* Set a default printer. Language specific initializations will
4061 override it later. */
4062 pp_format_decoder (global_dc->printer) = &default_tree_printer;
4064 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4066 signal (SIGSEGV, crash_signal);
4069 signal (SIGILL, crash_signal);
4072 signal (SIGBUS, crash_signal);
4075 signal (SIGABRT, crash_signal);
4077 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4078 signal (SIGIOT, crash_signal);
4081 signal (SIGFPE, crash_signal);
4084 /* Other host-specific signal setup. */
4085 (*host_hooks.extra_signals)();
4087 /* Initialize the garbage-collector, string pools and tree type hash
4093 /* Initialize register usage now so switches may override. */
4096 /* Register the language-independent parameters. */
4097 add_params (lang_independent_params, LAST_PARAM);
4099 /* This must be done after add_params but before argument processing. */
4100 init_ggc_heuristics();
4103 /* Process the options that have been parsed. */
4105 process_options (void)
4107 /* Allow the front end to perform consistency checks and do further
4108 initialization based on the command line options. This hook also
4109 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4110 so we can correctly initialize debug output. */
4111 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4112 input_filename = main_input_filename;
4114 #ifdef OVERRIDE_OPTIONS
4115 /* Some machines may reject certain combinations of options. */
4119 /* Set aux_base_name if not already set. */
4122 else if (main_input_filename)
4124 char *name = xstrdup (lbasename (main_input_filename));
4126 strip_off_ending (name, strlen (name));
4127 aux_base_name = name;
4130 aux_base_name = "gccaux";
4132 /* Set up the align_*_log variables, defaulting them to 1 if they
4133 were still unset. */
4134 if (align_loops <= 0) align_loops = 1;
4135 if (align_loops_max_skip > align_loops || !align_loops)
4136 align_loops_max_skip = align_loops - 1;
4137 align_loops_log = floor_log2 (align_loops * 2 - 1);
4138 if (align_jumps <= 0) align_jumps = 1;
4139 if (align_jumps_max_skip > align_jumps || !align_jumps)
4140 align_jumps_max_skip = align_jumps - 1;
4141 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4142 if (align_labels <= 0) align_labels = 1;
4143 align_labels_log = floor_log2 (align_labels * 2 - 1);
4144 if (align_labels_max_skip > align_labels || !align_labels)
4145 align_labels_max_skip = align_labels - 1;
4146 if (align_functions <= 0) align_functions = 1;
4147 align_functions_log = floor_log2 (align_functions * 2 - 1);
4149 /* Unrolling all loops implies that standard loop unrolling must also
4151 if (flag_unroll_all_loops)
4152 flag_unroll_loops = 1;
4154 if (flag_unroll_loops)
4156 flag_old_unroll_loops = 0;
4157 flag_old_unroll_all_loops = 0;
4160 if (flag_old_unroll_all_loops)
4161 flag_old_unroll_loops = 1;
4163 /* Old loop unrolling requires that strength_reduction be on also. Silently
4164 turn on strength reduction here if it isn't already on. Also, the loop
4165 unrolling code assumes that cse will be run after loop, so that must
4166 be turned on also. */
4167 if (flag_old_unroll_loops)
4169 flag_strength_reduce = 1;
4170 flag_rerun_cse_after_loop = 1;
4172 if (flag_unroll_loops || flag_peel_loops)
4173 flag_rerun_cse_after_loop = 1;
4175 if (flag_non_call_exceptions)
4176 flag_asynchronous_unwind_tables = 1;
4177 if (flag_asynchronous_unwind_tables)
4178 flag_unwind_tables = 1;
4180 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4182 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4183 flag_unit_at_a_time = 0;
4185 /* Warn about options that are not supported on this machine. */
4186 #ifndef INSN_SCHEDULING
4187 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4188 warning ("instruction scheduling not supported on this target machine");
4191 if (flag_delayed_branch)
4192 warning ("this target machine does not have delayed branches");
4195 user_label_prefix = USER_LABEL_PREFIX;
4196 if (flag_leading_underscore != -1)
4198 /* If the default prefix is more complicated than "" or "_",
4199 issue a warning and ignore this option. */
4200 if (user_label_prefix[0] == 0 ||
4201 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4203 user_label_prefix = flag_leading_underscore ? "_" : "";
4206 warning ("-f%sleading-underscore not supported on this target machine",
4207 flag_leading_underscore ? "" : "no-");
4210 /* If we are in verbose mode, write out the version and maybe all the
4211 option flags in use. */
4214 print_version (stderr, "");
4216 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4219 if (flag_syntax_only)
4221 write_symbols = NO_DEBUG;
4225 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4227 if (debug_info_level == DINFO_LEVEL_NONE)
4228 write_symbols = NO_DEBUG;
4230 /* Now we know write_symbols, set up the debug hooks based on it.
4231 By default we do nothing for debug output. */
4232 if (write_symbols == NO_DEBUG)
4233 debug_hooks = &do_nothing_debug_hooks;
4234 #if defined(DBX_DEBUGGING_INFO)
4235 else if (write_symbols == DBX_DEBUG)
4236 debug_hooks = &dbx_debug_hooks;
4238 #if defined(XCOFF_DEBUGGING_INFO)
4239 else if (write_symbols == XCOFF_DEBUG)
4240 debug_hooks = &xcoff_debug_hooks;
4242 #ifdef SDB_DEBUGGING_INFO
4243 else if (write_symbols == SDB_DEBUG)
4244 debug_hooks = &sdb_debug_hooks;
4246 #ifdef DWARF_DEBUGGING_INFO
4247 else if (write_symbols == DWARF_DEBUG)
4248 debug_hooks = &dwarf_debug_hooks;
4250 #ifdef DWARF2_DEBUGGING_INFO
4251 else if (write_symbols == DWARF2_DEBUG)
4252 debug_hooks = &dwarf2_debug_hooks;
4254 #ifdef VMS_DEBUGGING_INFO
4255 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4256 debug_hooks = &vmsdbg_debug_hooks;
4259 error ("target system does not support the \"%s\" debug format",
4260 debug_type_names[write_symbols]);
4262 /* If auxiliary info generation is desired, open the output file.
4263 This goes in the same directory as the source file--unlike
4264 all the other output files. */
4265 if (flag_gen_aux_info)
4267 aux_info_file = fopen (aux_info_file_name, "w");
4268 if (aux_info_file == 0)
4269 fatal_error ("can't open %s: %m", aux_info_file_name);
4272 if (! targetm.have_named_sections)
4274 if (flag_function_sections)
4276 warning ("-ffunction-sections not supported for this target");
4277 flag_function_sections = 0;
4279 if (flag_data_sections)
4281 warning ("-fdata-sections not supported for this target");
4282 flag_data_sections = 0;
4286 if (flag_function_sections && profile_flag)
4288 warning ("-ffunction-sections disabled; it makes profiling impossible");
4289 flag_function_sections = 0;
4292 #ifndef HAVE_prefetch
4293 if (flag_prefetch_loop_arrays)
4295 warning ("-fprefetch-loop-arrays not supported for this target");
4296 flag_prefetch_loop_arrays = 0;
4299 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4301 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4302 flag_prefetch_loop_arrays = 0;
4306 /* This combination of options isn't handled for i386 targets and doesn't
4307 make much sense anyway, so don't allow it. */
4308 if (flag_prefetch_loop_arrays && optimize_size)
4310 warning ("-fprefetch-loop-arrays is not supported with -Os");
4311 flag_prefetch_loop_arrays = 0;
4314 #ifndef OBJECT_FORMAT_ELF
4315 if (flag_function_sections && write_symbols != NO_DEBUG)
4316 warning ("-ffunction-sections may affect debugging on some targets");
4319 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4320 if (flag_signaling_nans)
4321 flag_trapping_math = 1;
4324 /* Initialize the compiler back end. */
4328 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4329 || debug_info_level == DINFO_LEVEL_VERBOSE
4330 #ifdef VMS_DEBUGGING_INFO
4331 /* Enable line number info for traceback. */
4332 || debug_info_level > DINFO_LEVEL_NONE
4334 || flag_test_coverage
4335 || warn_notreached);
4338 init_fake_stack_mems ();
4342 init_function_once ();
4343 init_varasm_once ();
4345 /* The following initialization functions need to generate rtl, so
4346 provide a dummy function context for them. */
4347 init_dummy_function_start ();
4349 if (flag_caller_saves)
4350 init_caller_save ();
4351 expand_dummy_function_end ();
4354 /* Language-dependent initialization. Returns nonzero on success. */
4356 lang_dependent_init (const char *name)
4358 if (dump_base_name == 0)
4359 dump_base_name = name ? name : "gccdump";
4361 /* Other front-end initialization. */
4362 if ((*lang_hooks.init) () == 0)
4365 init_asm_output (name);
4367 /* These create various _DECL nodes, so need to be called after the
4368 front end is initialized. */
4372 /* The following initialization functions need to generate rtl, so
4373 provide a dummy function context for them. */
4374 init_dummy_function_start ();
4376 expand_dummy_function_end ();
4378 /* If dbx symbol table desired, initialize writing it and output the
4379 predefined types. */
4380 timevar_push (TV_SYMOUT);
4382 #ifdef DWARF2_UNWIND_INFO
4383 if (dwarf2out_do_frame ())
4384 dwarf2out_frame_init ();
4387 /* Now we have the correct original filename, we can initialize
4389 (*debug_hooks->init) (name);
4391 timevar_pop (TV_SYMOUT);
4396 /* Clean up: close opened files, etc. */
4401 /* Close the dump files. */
4402 if (flag_gen_aux_info)
4404 fclose (aux_info_file);
4406 unlink (aux_info_file_name);
4409 /* Close non-debugging input and output files. Take special care to note
4410 whether fclose returns an error, since the pages might still be on the
4411 buffer chain while the file is open. */
4415 if (ferror (asm_out_file) != 0)
4416 fatal_error ("error writing to %s: %m", asm_file_name);
4417 if (fclose (asm_out_file) != 0)
4418 fatal_error ("error closing %s: %m", asm_file_name);
4421 /* Do whatever is necessary to finish printing the graphs. */
4422 if (graph_dump_format != no_graph)
4426 for (i = 0; i < (int) DFI_MAX; ++i)
4427 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4432 sprintf (seq, DUMPFILE_FORMAT, i);
4433 suffix = concat (seq, dump_file[i].extension, NULL);
4434 finish_graph_dump_file (dump_base_name, suffix);
4441 ggc_print_statistics ();
4442 stringpool_statistics ();
4443 dump_tree_statistics ();
4446 /* Free up memory for the benefit of leak detectors. */
4449 /* Language-specific end of compilation actions. */
4450 (*lang_hooks.finish) ();
4453 /* Initialize the compiler, and compile the input file. */
4457 /* Initialize timing first. The C front ends read the main file in
4458 the post_options hook, and C++ does file timings. */
4459 if (time_report || !quiet_flag || flag_detailed_statistics)
4461 timevar_start (TV_TOTAL);
4465 /* Don't do any more if an error has already occurred. */
4468 /* Set up the back-end if requested. */
4472 /* Language-dependent initialization. Returns true on success. */
4473 if (lang_dependent_init (main_input_filename))
4475 if (flag_unit_at_a_time)
4477 open_dump_file (DFI_cgraph, NULL);
4478 cgraph_dump_file = rtl_dump_file;
4479 rtl_dump_file = NULL;
4484 if (flag_unit_at_a_time)
4486 rtl_dump_file = cgraph_dump_file;
4487 cgraph_dump_file = NULL;
4488 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4495 /* Stop timing and print the times. */
4496 timevar_stop (TV_TOTAL);
4497 timevar_print (stderr);
4500 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4501 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4502 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4504 It is not safe to call this function more than once. */
4507 toplev_main (unsigned int argc, const char **argv)
4511 /* Initialization of GCC's environment, and diagnostics. */
4512 general_init (argv[0]);
4514 /* Parse the options and do minimal processing; basically just
4515 enough to default flags appropriately. */
4516 decode_options (argc, argv);
4520 /* Exit early if we can (e.g. -help). */
4521 if (!exit_after_options)
4524 if (errorcount || sorrycount)
4525 return (FATAL_EXIT_CODE);
4527 return (SUCCESS_EXIT_CODE);