1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addresof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
284 DFI_branch_target_load,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file[DFI_MAX] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index, tree);
345 static void close_dump_file (enum dump_file_index,
346 void (*) (FILE *, rtx), rtx);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit;
351 int flag_print_asm_name;
352 enum graph_dump_types graph_dump_format;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name;
358 /* Type(s) of debugging information we are producing (if any).
359 See flags.h for the definitions of the different possible
360 types of debugging information. */
361 enum debug_info_type write_symbols = NO_DEBUG;
363 /* Level of debugging information we are producing. See flags.h
364 for the definitions of the different possible levels. */
365 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
367 /* Nonzero means use GNU-only extensions in the generated symbolic
368 debugging information. */
369 /* Currently, this only has an effect when write_symbols is set to
370 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
371 int use_gnu_debug_info_extensions = 0;
373 /* Nonzero means do optimizations. -O.
374 Particular numeric values stand for particular amounts of optimization;
375 thus, -O2 stores 2 here. However, the optimizations beyond the basic
376 ones are not controlled directly by this variable. Instead, they are
377 controlled by individual `flag_...' variables that are defaulted
378 based on this variable. */
382 /* Nonzero means optimize for size. -Os.
383 The only valid values are zero and nonzero. When optimize_size is
384 nonzero, optimize defaults to 2, but certain individual code
385 bloating optimizations are disabled. */
387 int optimize_size = 0;
389 /* The FUNCTION_DECL for the function currently being compiled,
390 or 0 if between functions. */
391 tree current_function_decl;
393 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
395 tree current_function_func_begin_label;
397 /* Nonzero if doing dwarf2 duplicate elimination. */
399 int flag_eliminate_dwarf2_dups = 0;
401 /* Nonzero if doing unused type elimination. */
403 int flag_eliminate_unused_debug_types = 1;
405 /* Nonzero means emit debugging information only for symbols which are used. */
406 int flag_debug_only_used_symbols = 0;
408 /* Nonzero if generating code to do profiling. */
410 int profile_flag = 0;
412 /* Nonzero if generating code to profile program flow graph arcs. */
414 int profile_arc_flag = 0;
416 /* Nonzero if value histograms should be measured. */
418 int flag_profile_values = 0;
420 /* Nonzero if generating info for gcov to calculate line test coverage. */
422 int flag_test_coverage = 0;
424 /* Nonzero indicates that branch taken probabilities should be calculated. */
426 int flag_branch_probabilities = 0;
428 /* Nonzero if basic blocks should be reordered. */
430 int flag_reorder_blocks = 0;
432 /* Nonzero if functions should be reordered. */
434 int flag_reorder_functions = 0;
436 /* Nonzero if registers should be renamed. */
438 int flag_rename_registers = 0;
439 int flag_cprop_registers = 0;
441 /* Nonzero for -pedantic switch: warn about anything
442 that standard spec forbids. */
446 /* Temporarily suppress certain warnings.
447 This is set while reading code from a system header file. */
449 int in_system_header = 0;
451 /* Don't print functions as they are compiled. -quiet. */
455 /* Print times taken by the various passes. -ftime-report. */
459 /* Print memory still in use at end of compilation (which may have little
460 to do with peak memory consumption). -fmem-report. */
464 /* Nonzero means to collect statistics which might be expensive
465 and to print them when we are done. */
466 int flag_detailed_statistics = 0;
468 /* A random sequence of characters, unless overridden by user. */
469 const char *flag_random_seed;
471 /* A local time stamp derived from the time of compilation. It will be
472 zero if the system cannot provide a time. It will be -1u, if the
473 user has specified a particular random seed. */
478 /* Nonzero means `char' should be signed. */
480 int flag_signed_char;
482 /* Nonzero means give an enum type only as many bytes as it needs. */
484 int flag_short_enums;
486 /* Nonzero for -fcaller-saves: allocate values in regs that need to
487 be saved across function calls, if that produces overall better code.
488 Optional now, so people can test it. */
490 #ifdef DEFAULT_CALLER_SAVES
491 int flag_caller_saves = 1;
493 int flag_caller_saves = 0;
496 /* Nonzero if structures and unions should be returned in memory.
498 This should only be defined if compatibility with another compiler or
499 with an ABI is needed, because it results in slower code. */
501 #ifndef DEFAULT_PCC_STRUCT_RETURN
502 #define DEFAULT_PCC_STRUCT_RETURN 1
505 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
507 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
509 /* Nonzero for -fforce-mem: load memory value into a register
510 before arithmetic on it. This makes better cse but slower compilation. */
512 int flag_force_mem = 0;
514 /* Nonzero for -fforce-addr: load memory address into a register before
515 reference to memory. This makes better cse but slower compilation. */
517 int flag_force_addr = 0;
519 /* Nonzero for -fdefer-pop: don't pop args after each function call;
520 instead save them up to pop many calls' args with one insns. */
522 int flag_defer_pop = 0;
524 /* Nonzero for -ffloat-store: don't allocate floats and doubles
525 in extended-precision registers. */
527 int flag_float_store = 0;
529 /* Nonzero for -fcse-follow-jumps:
530 have cse follow jumps to do a more extensive job. */
532 int flag_cse_follow_jumps;
534 /* Nonzero for -fcse-skip-blocks:
535 have cse follow a branch around a block. */
536 int flag_cse_skip_blocks;
538 /* Nonzero for -fexpensive-optimizations:
539 perform miscellaneous relatively-expensive optimizations. */
540 int flag_expensive_optimizations;
542 /* Nonzero for -fthread-jumps:
543 have jump optimize output of loop. */
545 int flag_thread_jumps;
547 /* Nonzero enables strength-reduction in loop.c. */
549 int flag_strength_reduce = 0;
551 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
552 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
553 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
556 int flag_old_unroll_loops;
558 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
559 This is generally not a win. */
561 int flag_old_unroll_all_loops;
563 /* Enables unrolling of simple loops in loop-unroll.c. */
564 int flag_unroll_loops;
566 /* Enables unrolling of all loops in loop-unroll.c. */
567 int flag_unroll_all_loops;
569 /* Nonzero enables loop peeling. */
572 /* Nonzero enables loop unswitching. */
573 int flag_unswitch_loops;
575 /* Nonzero enables prefetch optimizations for arrays in loops. */
577 int flag_prefetch_loop_arrays;
579 /* Nonzero forces all invariant computations in loops to be moved
582 int flag_move_all_movables = 0;
584 /* Nonzero forces all general induction variables in loops to be
587 int flag_reduce_all_givs = 0;
589 /* Nonzero to perform full register move optimization passes. This is the
592 int flag_regmove = 0;
594 /* Nonzero for -fwritable-strings:
595 store string constants in data segment and don't uniquize them. */
597 int flag_writable_strings = 0;
599 /* Nonzero means don't put addresses of constant functions in registers.
600 Used for compiling the Unix kernel, where strange substitutions are
601 done on the assembly output. */
603 int flag_no_function_cse = 0;
605 /* Nonzero for -fomit-frame-pointer:
606 don't make a frame pointer in simple functions that don't require one. */
608 int flag_omit_frame_pointer = 0;
610 /* Nonzero means place each function into its own section on those platforms
611 which support arbitrary section names and unlimited numbers of sections. */
613 int flag_function_sections = 0;
615 /* ... and similar for data. */
617 int flag_data_sections = 0;
619 /* Nonzero to inhibit use of define_optimization peephole opts. */
621 int flag_no_peephole = 0;
623 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
625 int flag_optimize_sibling_calls = 0;
627 /* Nonzero means the front end generally wants `errno' maintained by math
628 operations, like built-in SQRT. */
630 int flag_errno_math = 1;
632 /* Nonzero means that unsafe floating-point math optimizations are allowed
633 for the sake of speed. IEEE compliance is not guaranteed, and operations
634 are allowed to assume that their arguments and results are "normal"
635 (e.g., nonnegative for SQRT). */
637 int flag_unsafe_math_optimizations = 0;
639 /* Nonzero means that no NaNs or +-Infs are expected. */
641 int flag_finite_math_only = 0;
643 /* Zero means that floating-point math operations cannot generate a
644 (user-visible) trap. This is the case, for example, in nonstop
645 IEEE 754 arithmetic. Trapping conditions include division by zero,
646 overflow, underflow, invalid and inexact, but does not include
647 operations on signaling NaNs (see below). */
649 int flag_trapping_math = 1;
651 /* Nonzero means disable transformations observable by signaling NaNs.
652 This option implies that any operation on an IEEE signaling NaN can
653 generate a (user-visible) trap. */
655 int flag_signaling_nans = 0;
657 /* 0 means straightforward implementation of complex divide acceptable.
658 1 means wide ranges of inputs must work for complex divide.
659 2 means C99-like requirements for complex divide (not yet implemented). */
661 int flag_complex_divide_method = 0;
663 /* Nonzero means just do syntax checking; don't output anything. */
665 int flag_syntax_only = 0;
667 /* Nonzero means perform loop optimizer. */
669 int flag_loop_optimize;
671 /* Nonzero means perform crossjumping. */
673 int flag_crossjumping;
675 /* Nonzero means perform if conversion. */
677 int flag_if_conversion;
679 /* Nonzero means perform if conversion after reload. */
681 int flag_if_conversion2;
683 /* Nonzero means to use global dataflow analysis to eliminate
684 useless null pointer tests. */
686 int flag_delete_null_pointer_checks;
688 /* Nonzero means perform global CSE. */
692 /* Nonzero means to do the enhanced load motion during gcse, which trys
693 to hoist loads by not killing them when a store to the same location
696 int flag_gcse_lm = 1;
698 /* Nonzero means to perform store motion after gcse, which will try to
699 move stores closer to the exit block. Its not very effective without
702 int flag_gcse_sm = 1;
704 /* Perform target register optimization before prologue / epilogue
707 int flag_branch_target_load_optimize = 0;
709 /* Perform target register optimization after prologue / epilogue
710 threading and jump2. */
712 int flag_branch_target_load_optimize2 = 0;
714 /* Nonzero means to rerun cse after loop optimization. This increases
715 compilation time about 20% and picks up a few more common expressions. */
717 int flag_rerun_cse_after_loop;
719 /* Nonzero means to run loop optimizations twice. */
721 int flag_rerun_loop_opt;
723 /* Nonzero for -finline-functions: ok to inline functions that look like
724 good inline candidates. */
726 int flag_inline_functions;
728 /* Nonzero for -fkeep-inline-functions: even if we make a function
729 go inline everywhere, keep its definition around for debugging
732 int flag_keep_inline_functions;
734 /* Nonzero means that functions will not be inlined. */
736 int flag_no_inline = 2;
738 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
739 not just because the tree inliner turned us off. */
741 int flag_really_no_inline = 2;
743 /* Nonzero means that we should emit static const variables
744 regardless of whether or not optimization is turned on. */
746 int flag_keep_static_consts = 1;
748 /* Nonzero means we should be saving declaration info into a .X file. */
750 int flag_gen_aux_info = 0;
752 /* Specified name of aux-info file. */
754 const char *aux_info_file_name;
756 /* Nonzero means make the text shared if supported. */
758 int flag_shared_data;
760 /* Nonzero means schedule into delayed branch slots if supported. */
762 int flag_delayed_branch;
764 /* Nonzero if we are compiling pure (sharable) code.
765 Value is 1 if we are doing "small" pic; value is 2 if we're doing
770 /* Nonzero if we are compiling position independent code for executable.
771 The value is 1 if we are doing "small" pic; value is 2 if we're doing
776 /* Nonzero if we are compiling code for a shared library, zero for
781 /* Set to the default thread-local storage (tls) model to use. */
783 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
785 /* Nonzero means generate extra code for exception handling and enable
786 exception handling. */
790 /* Nonzero means generate frame unwind info table when supported. */
792 int flag_unwind_tables = 0;
794 /* Nonzero means generate frame unwind info table exact at each insn
797 int flag_asynchronous_unwind_tables = 0;
799 /* Nonzero means don't place uninitialized global data in common storage
804 /* Nonzero means change certain warnings into errors.
805 Usually these are warnings about failure to conform to some standard. */
807 int flag_pedantic_errors = 0;
809 /* flag_schedule_insns means schedule insns within basic blocks (before
811 flag_schedule_insns_after_reload means schedule insns after
814 int flag_schedule_insns = 0;
815 int flag_schedule_insns_after_reload = 0;
817 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
818 int flag_sched2_use_superblocks = 0;
820 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
822 int flag_sched2_use_traces = 0;
824 /* The following flags have effect only for scheduling before register
827 flag_schedule_interblock means schedule insns across basic blocks.
828 flag_schedule_speculative means allow speculative motion of non-load insns.
829 flag_schedule_speculative_load means allow speculative motion of some
831 flag_schedule_speculative_load_dangerous allows speculative motion of more
834 int flag_schedule_interblock = 1;
835 int flag_schedule_speculative = 1;
836 int flag_schedule_speculative_load = 0;
837 int flag_schedule_speculative_load_dangerous = 0;
839 int flag_single_precision_constant;
841 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
842 by a cheaper branch on a count register. */
843 int flag_branch_on_count_reg = 1;
845 /* -finhibit-size-directive inhibits output of .size for ELF.
846 This is used only for compiling crtstuff.c,
847 and it may be extended to other effects
848 needed for crtstuff.c on other systems. */
849 int flag_inhibit_size_directive = 0;
851 /* -fverbose-asm causes extra commentary information to be produced in
852 the generated assembly code (to make it more readable). This option
853 is generally only of use to those who actually need to read the
854 generated assembly code (perhaps while debugging the compiler itself).
855 -fno-verbose-asm, the default, causes the extra information
856 to be omitted and is useful when comparing two assembler files. */
858 int flag_verbose_asm = 0;
860 /* -dA causes debug commentary information to be produced in
861 the generated assembly code (to make it more readable). This option
862 is generally only of use to those who actually need to read the
863 generated assembly code (perhaps while debugging the compiler itself).
864 Currently, this switch is only used by dwarfout.c; however, it is intended
865 to be a catchall for printing debug information in the assembler file. */
867 int flag_debug_asm = 0;
869 /* -dP causes the rtl to be emitted as a comment in assembly. */
871 int flag_dump_rtl_in_asm = 0;
873 /* -fgnu-linker specifies use of the GNU linker for initializations.
874 (Or, more generally, a linker that handles initializations.)
875 -fno-gnu-linker says that collect2 will be used. */
877 int flag_gnu_linker = 0;
879 int flag_gnu_linker = 1;
882 /* Nonzero means put zero initialized data in the bss section. */
883 int flag_zero_initialized_in_bss = 1;
888 /* Enable ssa conditional constant propagation. */
889 int flag_ssa_ccp = 0;
891 /* Enable ssa aggressive dead code elimination. */
892 int flag_ssa_dce = 0;
894 /* Tag all structures with __attribute__(packed). */
895 int flag_pack_struct = 0;
897 /* Emit code to check for stack overflow; also may cause large objects
898 to be allocated dynamically. */
899 int flag_stack_check;
901 /* When non-NULL, indicates that whenever space is allocated on the
902 stack, the resulting stack pointer must not pass this
903 address---that is, for stacks that grow downward, the stack pointer
904 must always be greater than or equal to this address; for stacks
905 that grow upward, the stack pointer must be less than this address.
906 At present, the rtx may be either a REG or a SYMBOL_REF, although
907 the support provided depends on the backend. */
910 /* 0 if pointer arguments may alias each other. True in C.
911 1 if pointer arguments may not alias each other but may alias
913 2 if pointer arguments may not alias each other and may not
914 alias global variables. True in Fortran.
915 This defaults to 0 for C. */
916 int flag_argument_noalias = 0;
918 /* Nonzero if we should do (language-dependent) alias analysis.
919 Typically, this analysis will assume that expressions of certain
920 types do not alias expressions of certain other types. Only used
921 if alias analysis (in general) is enabled. */
922 int flag_strict_aliasing = 0;
924 /* Instrument functions with calls at entry and exit, for profiling. */
925 int flag_instrument_function_entry_exit = 0;
927 /* Nonzero means ignore `#ident' directives. 0 means handle them.
928 On SVR4 targets, it also controls whether or not to emit a
929 string identifying the compiler. */
931 int flag_no_ident = 0;
933 /* This will perform a peephole pass before sched2. */
934 int flag_peephole2 = 0;
936 /* This will try to guess branch probabilities. */
937 int flag_guess_branch_prob = 0;
939 /* -fcheck-bounds causes gcc to generate array bounds checks.
940 For C, C++, ObjC: defaults to off.
941 For Java: defaults to on.
942 For Fortran: defaults to off. */
943 int flag_bounds_check = 0;
945 /* This will attempt to merge constant section constants, if 1 only
946 string constants and constants from constant pool, if 2 also constant
948 int flag_merge_constants = 1;
950 /* If one, renumber instruction UIDs to reduce the number of
951 unused UIDs if there are a lot of instructions. If greater than
952 one, unconditionally renumber instruction UIDs. */
953 int flag_renumber_insns = 1;
955 /* If nonzero, use the graph coloring register allocator. */
956 int flag_new_regalloc = 0;
958 /* Nonzero if we perform superblock formation. */
962 /* Nonzero if we perform whole unit at a time compilation. */
964 int flag_unit_at_a_time = 0;
966 /* Values of the -falign-* flags: how much to align labels in code.
967 0 means `use default', 1 means `don't align'.
968 For each variable, there is an _log variant which is the power
969 of two not less than the variable, for .align output. */
973 int align_loops_max_skip;
976 int align_jumps_max_skip;
978 int align_labels_log;
979 int align_labels_max_skip;
981 int align_functions_log;
983 /* Like align_functions_log above, but used by front-ends to force the
984 minimum function alignment. Zero means no alignment is forced. */
985 int force_align_functions_log;
987 /* Table of supported debugging formats. */
990 const char *const arg;
991 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
992 constant expression, we use NO_DEBUG in its place. */
993 const enum debug_info_type debug_type;
994 const int use_extensions_p;
995 const char *const description;
999 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
1000 N_("Generate debugging info in default format") },
1001 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
1002 #ifdef DBX_DEBUGGING_INFO
1003 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
1004 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
1006 #ifdef DWARF_DEBUGGING_INFO
1007 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
1008 { "dwarf+", DWARF_DEBUG, 1,
1009 N_("Generate extended DWARF-1 format debug info") },
1011 #ifdef DWARF2_DEBUGGING_INFO
1012 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
1014 #ifdef XCOFF_DEBUGGING_INFO
1015 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
1016 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
1018 #ifdef SDB_DEBUGGING_INFO
1019 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
1021 #ifdef VMS_DEBUGGING_INFO
1022 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
1029 const char *const string;
1030 int *const variable;
1033 lang_independent_options;
1035 /* Nonzero if signed arithmetic overflow should trap. */
1038 /* Nonzero if signed arithmetic overflow should wrap around. */
1041 /* Add or remove a leading underscore from user symbols. */
1042 int flag_leading_underscore = -1;
1044 /* The user symbol prefix after having resolved same. */
1045 const char *user_label_prefix;
1047 static const param_info lang_independent_params[] = {
1048 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
1049 { OPTION, DEFAULT, HELP },
1050 #include "params.def"
1055 /* Table of language-independent -f options.
1056 STRING is the option name. VARIABLE is the address of the variable.
1057 ON_VALUE is the value to store in VARIABLE
1058 if `-fSTRING' is seen as an option.
1059 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1061 static const lang_independent_options f_options[] =
1063 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1064 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1065 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1066 {"float-store", &flag_float_store, 1 },
1067 {"defer-pop", &flag_defer_pop, 1 },
1068 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1069 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1070 {"tracer", &flag_tracer, 1 },
1071 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1072 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1073 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1074 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1075 {"thread-jumps", &flag_thread_jumps, 1 },
1076 {"strength-reduce", &flag_strength_reduce, 1 },
1077 {"unroll-loops", &flag_unroll_loops, 1 },
1078 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1079 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1080 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1081 {"peel-loops", &flag_peel_loops, 1 },
1082 {"unswitch-loops", &flag_unswitch_loops, 1 },
1083 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1084 {"move-all-movables", &flag_move_all_movables, 1 },
1085 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1086 {"writable-strings", &flag_writable_strings, 1 },
1087 {"peephole", &flag_no_peephole, 0 },
1088 {"force-mem", &flag_force_mem, 1 },
1089 {"force-addr", &flag_force_addr, 1 },
1090 {"function-cse", &flag_no_function_cse, 0 },
1091 {"inline-functions", &flag_inline_functions, 1 },
1092 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1093 {"inline", &flag_no_inline, 0 },
1094 {"keep-static-consts", &flag_keep_static_consts, 1 },
1095 {"syntax-only", &flag_syntax_only, 1 },
1096 {"shared-data", &flag_shared_data, 1 },
1097 {"caller-saves", &flag_caller_saves, 1 },
1098 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1099 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1100 {"delayed-branch", &flag_delayed_branch, 1 },
1101 {"gcse", &flag_gcse, 1 },
1102 {"gcse-lm", &flag_gcse_lm, 1 },
1103 {"gcse-sm", &flag_gcse_sm, 1 },
1104 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1105 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1106 {"loop-optimize", &flag_loop_optimize, 1 },
1107 {"crossjumping", &flag_crossjumping, 1 },
1108 {"if-conversion", &flag_if_conversion, 1 },
1109 {"if-conversion2", &flag_if_conversion2, 1 },
1110 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1111 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1112 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1113 {"schedule-insns", &flag_schedule_insns, 1 },
1114 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1115 {"sched-interblock",&flag_schedule_interblock, 1 },
1116 {"sched-spec",&flag_schedule_speculative, 1 },
1117 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1118 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1119 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1120 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1121 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1122 {"pic", &flag_pic, 1 },
1123 {"PIC", &flag_pic, 2 },
1124 {"pie", &flag_pie, 1 },
1125 {"PIE", &flag_pie, 2 },
1126 {"exceptions", &flag_exceptions, 1 },
1127 {"unwind-tables", &flag_unwind_tables, 1 },
1128 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1129 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1130 {"profile-arcs", &profile_arc_flag, 1 },
1131 {"test-coverage", &flag_test_coverage, 1 },
1132 {"branch-probabilities", &flag_branch_probabilities, 1 },
1133 {"profile", &profile_flag, 1 },
1134 {"reorder-blocks", &flag_reorder_blocks, 1 },
1135 {"reorder-functions", &flag_reorder_functions, 1 },
1136 {"rename-registers", &flag_rename_registers, 1 },
1137 {"cprop-registers", &flag_cprop_registers, 1 },
1138 {"common", &flag_no_common, 0 },
1139 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1140 {"function-sections", &flag_function_sections, 1 },
1141 {"data-sections", &flag_data_sections, 1 },
1142 {"verbose-asm", &flag_verbose_asm, 1 },
1143 {"gnu-linker", &flag_gnu_linker, 1 },
1144 {"regmove", &flag_regmove, 1 },
1145 {"optimize-register-move", &flag_regmove, 1 },
1146 {"pack-struct", &flag_pack_struct, 1 },
1147 {"stack-check", &flag_stack_check, 1 },
1148 {"argument-alias", &flag_argument_noalias, 0 },
1149 {"argument-noalias", &flag_argument_noalias, 1 },
1150 {"argument-noalias-global", &flag_argument_noalias, 2 },
1151 {"strict-aliasing", &flag_strict_aliasing, 1 },
1152 {"align-loops", &align_loops, 0 },
1153 {"align-jumps", &align_jumps, 0 },
1154 {"align-labels", &align_labels, 0 },
1155 {"align-functions", &align_functions, 0 },
1156 {"merge-constants", &flag_merge_constants, 1 },
1157 {"merge-all-constants", &flag_merge_constants, 2 },
1158 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1159 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1160 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1161 {"ssa", &flag_ssa, 1 },
1162 {"ssa-ccp", &flag_ssa_ccp, 1 },
1163 {"ssa-dce", &flag_ssa_dce, 1 },
1164 {"leading-underscore", &flag_leading_underscore, 1 },
1165 {"ident", &flag_no_ident, 0 },
1166 { "peephole2", &flag_peephole2, 1 },
1167 {"finite-math-only", &flag_finite_math_only, 1 },
1168 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1169 {"math-errno", &flag_errno_math, 1 },
1170 {"trapping-math", &flag_trapping_math, 1 },
1171 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1172 {"signaling-nans", &flag_signaling_nans, 1 },
1173 {"bounds-check", &flag_bounds_check, 1 },
1174 {"single-precision-constant", &flag_single_precision_constant, 1 },
1175 {"time-report", &time_report, 1 },
1176 {"mem-report", &mem_report, 1 },
1177 { "trapv", &flag_trapv, 1 },
1178 { "wrapv", &flag_wrapv, 1 },
1179 { "new-ra", &flag_new_regalloc, 1 }
1182 /* Table of language-specific options. */
1184 static const struct lang_opt
1186 const char *const option;
1187 const char *const description;
1189 documented_lang_options[] =
1191 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1193 #include "options_.h"
1198 /* Here is a table, controlled by the tm.h file, listing each -m switch
1199 and which bits in `target_switches' it should set or clear.
1200 If VALUE is positive, it is bits to set.
1201 If VALUE is negative, -VALUE is bits to clear.
1202 (The sign bit is not used so there is no confusion.) */
1206 const char *const name;
1208 const char *const description;
1210 target_switches[] = TARGET_SWITCHES;
1212 /* This table is similar, but allows the switch to have a value. */
1214 #ifdef TARGET_OPTIONS
1217 const char *const prefix;
1218 const char **const variable;
1219 const char *const description;
1220 const char *const value;
1222 target_options[] = TARGET_OPTIONS;
1225 /* Nonzero means warn about function definitions that default the return type
1226 or that use a null return and have a return-type other than void. */
1228 int warn_return_type;
1230 /* Output files for assembler code (real compiler output)
1231 and debugging dumps. */
1234 FILE *aux_info_file;
1235 FILE *rtl_dump_file = NULL;
1236 FILE *cgraph_dump_file = NULL;
1238 /* Set up a default flag_random_seed and local_tick, unless the user
1239 already specified one. */
1244 if (!flag_random_seed)
1246 unsigned HOST_WIDE_INT value;
1247 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1249 /* Get some more or less random data. */
1250 #ifdef HAVE_GETTIMEOFDAY
1254 gettimeofday (&tv, NULL);
1255 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1259 time_t now = time (NULL);
1261 if (now != (time_t)-1)
1262 local_tick = (unsigned) now;
1265 value = local_tick ^ getpid ();
1267 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1268 flag_random_seed = random_seed;
1270 else if (!local_tick)
1275 /* Decode the string P as an integral parameter.
1276 If the string is indeed an integer return its numeric value else
1277 issue an Invalid Option error for the option PNAME and return DEFVAL.
1278 If PNAME is zero just return DEFVAL, do not call error. */
1281 read_integral_parameter (const char *p, const char *pname, const int defval)
1283 const char *endp = p;
1287 if (ISDIGIT (*endp))
1296 error ("invalid option argument `%s'", pname);
1303 /* Return the logarithm of X, base 2, considering X unsigned,
1304 if X is a power of 2. Otherwise, returns -1.
1306 This should be used via the `exact_log2' macro. */
1309 exact_log2_wide (unsigned HOST_WIDE_INT x)
1312 /* Test for 0 or a power of 2. */
1313 if (x == 0 || x != (x & -x))
1315 while ((x >>= 1) != 0)
1320 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1321 If X is 0, return -1.
1323 This should be used via the floor_log2 macro. */
1326 floor_log2_wide (unsigned HOST_WIDE_INT x)
1335 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1336 into ICE messages, which is much more user friendly. In case the
1337 error printer crashes, reset the signal to prevent infinite recursion. */
1340 crash_signal (int signo)
1342 signal (signo, SIG_DFL);
1343 internal_error ("%s", strsignal (signo));
1346 /* Arrange to dump core on error. (The regular error message is still
1347 printed first, except in the case of abort().) */
1350 setup_core_dumping (void)
1353 signal (SIGABRT, SIG_DFL);
1355 #if defined(HAVE_SETRLIMIT)
1358 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1359 fatal_error ("getting core file size maximum limit: %m");
1360 rlim.rlim_cur = rlim.rlim_max;
1361 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1362 fatal_error ("setting core file size limit to maximum: %m");
1365 diagnostic_abort_on_error (global_dc);
1369 /* Strip off a legitimate source ending from the input string NAME of
1370 length LEN. Rather than having to know the names used by all of
1371 our front ends, we strip off an ending of a period followed by
1372 up to five characters. (Java uses ".class".) */
1375 strip_off_ending (char *name, int len)
1378 for (i = 2; i < 6 && len > i; i++)
1380 if (name[len - i] == '.')
1382 name[len - i] = '\0';
1388 /* Output a quoted string. */
1391 output_quoted_string (FILE *asm_file, const char *string)
1393 #ifdef OUTPUT_QUOTED_STRING
1394 OUTPUT_QUOTED_STRING (asm_file, string);
1398 putc ('\"', asm_file);
1399 while ((c = *string++) != 0)
1403 if (c == '\"' || c == '\\')
1404 putc ('\\', asm_file);
1408 fprintf (asm_file, "\\%03o", (unsigned char) c);
1410 putc ('\"', asm_file);
1414 /* Output a file name in the form wanted by System V. */
1417 output_file_directive (FILE *asm_file, const char *input_name)
1419 int len = strlen (input_name);
1420 const char *na = input_name + len;
1422 /* NA gets INPUT_NAME sans directory names. */
1423 while (na > input_name)
1425 if (IS_DIR_SEPARATOR (na[-1]))
1430 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1431 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1433 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1434 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1436 fprintf (asm_file, "\t.file\t");
1437 output_quoted_string (asm_file, na);
1438 fputc ('\n', asm_file);
1443 /* Routine to open a dump file. Return true if the dump file is enabled. */
1446 open_dump_file (enum dump_file_index index, tree decl)
1449 const char *open_arg;
1452 if (! dump_file[index].enabled)
1455 timevar_push (TV_DUMP);
1456 if (rtl_dump_file != NULL)
1457 fclose (rtl_dump_file);
1459 sprintf (seq, DUMPFILE_FORMAT, index);
1461 if (! dump_file[index].initialized)
1463 /* If we've not initialized the files, do so now. */
1464 if (graph_dump_format != no_graph
1465 && dump_file[index].graph_dump_p)
1467 dump_name = concat (seq, dump_file[index].extension, NULL);
1468 clean_graph_dump_file (dump_base_name, dump_name);
1471 dump_file[index].initialized = 1;
1477 dump_name = concat (dump_base_name, seq,
1478 dump_file[index].extension, NULL);
1480 rtl_dump_file = fopen (dump_name, open_arg);
1481 if (rtl_dump_file == NULL)
1482 fatal_error ("can't open %s: %m", dump_name);
1487 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1488 (*lang_hooks.decl_printable_name) (decl, 2),
1489 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1491 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1492 ? " (unlikely executed)"
1495 timevar_pop (TV_DUMP);
1499 /* Routine to close a dump file. */
1502 close_dump_file (enum dump_file_index index,
1503 void (*func) (FILE *, rtx),
1506 if (! rtl_dump_file)
1509 timevar_push (TV_DUMP);
1511 && graph_dump_format != no_graph
1512 && dump_file[index].graph_dump_p)
1517 sprintf (seq, DUMPFILE_FORMAT, index);
1518 suffix = concat (seq, dump_file[index].extension, NULL);
1519 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1524 func (rtl_dump_file, insns);
1526 fflush (rtl_dump_file);
1527 fclose (rtl_dump_file);
1529 rtl_dump_file = NULL;
1530 timevar_pop (TV_DUMP);
1533 /* Do any final processing required for the declarations in VEC, of
1534 which there are LEN. We write out inline functions and variables
1535 that have been deferred until this point, but which are required.
1536 Returns nonzero if anything was put out. */
1539 wrapup_global_declarations (tree *vec, int len)
1544 int output_something = 0;
1546 for (i = 0; i < len; i++)
1550 /* We're not deferring this any longer. Assignment is
1551 conditional to avoid needlessly dirtying PCH pages. */
1552 if (DECL_DEFER_OUTPUT (decl) != 0)
1553 DECL_DEFER_OUTPUT (decl) = 0;
1555 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1556 (*lang_hooks.finish_incomplete_decl) (decl);
1559 /* Now emit any global variables or functions that we have been
1560 putting off. We need to loop in case one of the things emitted
1561 here references another one which comes earlier in the list. */
1565 for (i = 0; i < len; i++)
1569 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1572 /* Don't write out static consts, unless we still need them.
1574 We also keep static consts if not optimizing (for debugging),
1575 unless the user specified -fno-keep-static-consts.
1576 ??? They might be better written into the debug information.
1577 This is possible when using DWARF.
1579 A language processor that wants static constants to be always
1580 written out (even if it is not used) is responsible for
1581 calling rest_of_decl_compilation itself. E.g. the C front-end
1582 calls rest_of_decl_compilation from finish_decl.
1583 One motivation for this is that is conventional in some
1584 environments to write things like:
1585 static const char rcsid[] = "... version string ...";
1586 intending to force the string to be in the executable.
1588 A language processor that would prefer to have unneeded
1589 static constants "optimized away" would just defer writing
1590 them out until here. E.g. C++ does this, because static
1591 constants are often defined in header files.
1593 ??? A tempting alternative (for both C and C++) would be
1594 to force a constant to be written if and only if it is
1595 defined in a main file, as opposed to an include file. */
1597 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1601 if (flag_unit_at_a_time
1602 && cgraph_varpool_node (decl)->finalized)
1604 else if (flag_unit_at_a_time
1605 && (TREE_USED (decl)
1606 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1608 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1610 else if (DECL_COMDAT (decl))
1612 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1613 && (optimize || !flag_keep_static_consts
1614 || DECL_ARTIFICIAL (decl)))
1620 rest_of_decl_compilation (decl, NULL, 1, 1);
1624 if (TREE_CODE (decl) == FUNCTION_DECL
1625 && DECL_INITIAL (decl) != 0
1626 && DECL_SAVED_INSNS (decl) != 0
1627 && (flag_keep_inline_functions
1628 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1629 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1632 output_inline_function (decl);
1637 output_something = 1;
1641 return output_something;
1644 /* Issue appropriate warnings for the global declarations in VEC (of
1645 which there are LEN). Output debugging information for them. */
1648 check_global_declarations (tree *vec, int len)
1653 for (i = 0; i < len; i++)
1657 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1658 && ! TREE_ASM_WRITTEN (decl))
1659 /* Cancel the RTL for this decl so that, if debugging info
1660 output for global variables is still to come,
1661 this one will be omitted. */
1662 SET_DECL_RTL (decl, NULL_RTX);
1664 /* Warn about any function
1665 declared static but not defined.
1666 We don't warn about variables,
1667 because many programs have static variables
1668 that exist only to get some text into the object file. */
1669 if (TREE_CODE (decl) == FUNCTION_DECL
1670 && (warn_unused_function
1671 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1672 && DECL_INITIAL (decl) == 0
1673 && DECL_EXTERNAL (decl)
1674 && ! DECL_ARTIFICIAL (decl)
1675 && ! TREE_PUBLIC (decl))
1677 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1678 pedwarn_with_decl (decl,
1679 "`%s' used but never defined");
1681 warning_with_decl (decl,
1682 "`%s' declared `static' but never defined");
1683 /* This symbol is effectively an "extern" declaration now. */
1684 TREE_PUBLIC (decl) = 1;
1685 assemble_external (decl);
1688 /* Warn about static fns or vars defined but not used. */
1689 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1690 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1691 && ! TREE_USED (decl)
1692 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1693 to handle multiple external decls in different scopes. */
1694 && ! TREE_USED (DECL_NAME (decl))
1695 && ! DECL_EXTERNAL (decl)
1696 && ! TREE_PUBLIC (decl)
1697 /* A volatile variable might be used in some non-obvious way. */
1698 && ! TREE_THIS_VOLATILE (decl)
1699 /* Global register variables must be declared to reserve them. */
1700 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1701 /* Otherwise, ask the language. */
1702 && (*lang_hooks.decls.warn_unused_global) (decl))
1703 warning_with_decl (decl, "`%s' defined but not used");
1705 /* Avoid confusing the debug information machinery when there are
1707 if (errorcount == 0 && sorrycount == 0)
1709 timevar_push (TV_SYMOUT);
1710 (*debug_hooks->global_decl) (decl);
1711 timevar_pop (TV_SYMOUT);
1716 /* Save the current INPUT_LOCATION on the top entry in the
1717 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1718 INPUT_LOCATION accordingly. */
1721 push_srcloc (const char *file, int line)
1723 struct file_stack *fs;
1725 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
1726 fs->location = input_location;
1727 fs->next = input_file_stack;
1728 input_filename = file;
1730 input_file_stack = fs;
1731 input_file_stack_tick++;
1734 /* Pop the top entry off the stack of presently open source files.
1735 Restore the INPUT_LOCATION from the new topmost entry on the
1741 struct file_stack *fs;
1743 fs = input_file_stack;
1744 input_location = fs->location;
1745 input_file_stack = fs->next;
1747 input_file_stack_tick++;
1750 /* Compile an entire translation unit. Write a file of assembly
1751 output and various debugging dumps. */
1756 /* Initialize yet another pass. */
1758 init_final (main_input_filename);
1759 coverage_init (aux_base_name);
1761 timevar_push (TV_PARSE);
1763 /* Call the parser, which parses the entire file (calling
1764 rest_of_compilation for each function). */
1765 (*lang_hooks.parse_file) (set_yydebug);
1767 /* In case there were missing block closers,
1768 get us back to the global binding level. */
1769 (*lang_hooks.clear_binding_stack) ();
1771 /* Compilation is now finished except for writing
1772 what's left of the symbol table output. */
1773 timevar_pop (TV_PARSE);
1775 if (flag_syntax_only)
1778 (*lang_hooks.decls.final_write_globals)();
1780 cgraph_varpool_assemble_pending_decls ();
1782 /* This must occur after the loop to output deferred functions.
1783 Else the coverage initializer would not be emitted if all the
1784 functions in this compilation unit were deferred. */
1787 /* Write out any pending weak symbol declarations. */
1791 /* Do dbx symbols. */
1792 timevar_push (TV_SYMOUT);
1794 #ifdef DWARF2_UNWIND_INFO
1795 if (dwarf2out_do_frame ())
1796 dwarf2out_frame_finish ();
1799 (*debug_hooks->finish) (main_input_filename);
1800 timevar_pop (TV_SYMOUT);
1802 /* Output some stuff at end of file if nec. */
1804 dw2_output_indirect_constants ();
1806 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1808 timevar_push (TV_DUMP);
1809 open_dump_file (DFI_bp, NULL);
1813 close_dump_file (DFI_bp, NULL, NULL_RTX);
1814 timevar_pop (TV_DUMP);
1817 targetm.asm_out.file_end ();
1819 /* Attach a special .ident directive to the end of the file to identify
1820 the version of GCC which compiled this code. The format of the .ident
1821 string is patterned after the ones produced by native SVR4 compilers. */
1824 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1825 IDENT_ASM_OP, version_string);
1828 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1830 timevar_push (TV_DUMP);
1831 dump_combine_total_stats (rtl_dump_file);
1832 close_dump_file (DFI_combine, NULL, NULL_RTX);
1833 timevar_pop (TV_DUMP);
1837 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1838 and TYPE_DECL nodes.
1840 This does nothing for local (non-static) variables, unless the
1841 variable is a register variable with an ASMSPEC. In that case, or
1842 if the variable is not an automatic, it sets up the RTL and
1843 outputs any assembler code (label definition, storage allocation
1844 and initialization).
1846 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1847 the assembler symbol name to be used. TOP_LEVEL is nonzero
1848 if this declaration is not within a function. */
1851 rest_of_decl_compilation (tree decl,
1852 const char *asmspec,
1856 /* We deferred calling assemble_alias so that we could collect
1857 other attributes such as visibility. Emit the alias now. */
1860 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1863 alias = TREE_VALUE (TREE_VALUE (alias));
1864 alias = get_identifier (TREE_STRING_POINTER (alias));
1865 assemble_alias (decl, alias);
1869 /* Forward declarations for nested functions are not "external",
1870 but we need to treat them as if they were. */
1871 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1872 || TREE_CODE (decl) == FUNCTION_DECL)
1874 timevar_push (TV_VARCONST);
1877 make_decl_rtl (decl, asmspec);
1879 /* Don't output anything when a tentative file-scope definition
1880 is seen. But at end of compilation, do output code for them. */
1881 if (at_end || !DECL_DEFER_OUTPUT (decl))
1883 if (flag_unit_at_a_time && !cgraph_global_info_ready
1884 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1885 cgraph_varpool_finalize_decl (decl);
1887 assemble_variable (decl, top_level, at_end, 0);
1890 #ifdef ASM_FINISH_DECLARE_OBJECT
1891 if (decl == last_assemble_variable_decl)
1893 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1898 timevar_pop (TV_VARCONST);
1900 else if (DECL_REGISTER (decl) && asmspec != 0)
1902 if (decode_reg_name (asmspec) >= 0)
1904 SET_DECL_RTL (decl, NULL_RTX);
1905 make_decl_rtl (decl, asmspec);
1909 error ("invalid register name `%s' for register variable", asmspec);
1910 DECL_REGISTER (decl) = 0;
1915 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1916 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1917 && TREE_CODE (decl) == TYPE_DECL)
1919 timevar_push (TV_SYMOUT);
1920 dbxout_symbol (decl, 0);
1921 timevar_pop (TV_SYMOUT);
1924 #ifdef SDB_DEBUGGING_INFO
1925 else if (write_symbols == SDB_DEBUG && top_level
1926 && TREE_CODE (decl) == TYPE_DECL)
1928 timevar_push (TV_SYMOUT);
1929 sdbout_symbol (decl, 0);
1930 timevar_pop (TV_SYMOUT);
1933 #ifdef DWARF2_DEBUGGING_INFO
1934 else if ((write_symbols == DWARF2_DEBUG
1935 || write_symbols == VMS_AND_DWARF2_DEBUG)
1937 && TREE_CODE (decl) == TYPE_DECL)
1939 timevar_push (TV_SYMOUT);
1940 dwarf2out_decl (decl);
1941 timevar_pop (TV_SYMOUT);
1946 /* Called after finishing a record, union or enumeral type. */
1949 rest_of_type_compilation (
1950 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1951 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1955 tree type ATTRIBUTE_UNUSED,
1956 int toplev ATTRIBUTE_UNUSED
1960 /* Avoid confusing the debug information machinery when there are
1962 if (errorcount != 0 || sorrycount != 0)
1965 timevar_push (TV_SYMOUT);
1966 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1967 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1968 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
1970 #ifdef SDB_DEBUGGING_INFO
1971 if (write_symbols == SDB_DEBUG)
1972 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
1974 #ifdef DWARF2_DEBUGGING_INFO
1975 if ((write_symbols == DWARF2_DEBUG
1976 || write_symbols == VMS_AND_DWARF2_DEBUG)
1978 dwarf2out_decl (TYPE_STUB_DECL (type));
1980 timevar_pop (TV_SYMOUT);
1983 /* Turn the RTL into assembly. */
1985 rest_of_handle_final (tree decl, rtx insns)
1987 timevar_push (TV_FINAL);
1992 /* Get the function's name, as described by its RTL. This may be
1993 different from the DECL_NAME name used in the source file. */
1995 x = DECL_RTL (decl);
1996 if (GET_CODE (x) != MEM)
1999 if (GET_CODE (x) != SYMBOL_REF)
2001 fnname = XSTR (x, 0);
2003 assemble_start_function (decl, fnname);
2004 final_start_function (insns, asm_out_file, optimize);
2005 final (insns, asm_out_file, optimize, 0);
2006 final_end_function ();
2008 #ifdef IA64_UNWIND_INFO
2009 /* ??? The IA-64 ".handlerdata" directive must be issued before
2010 the ".endp" directive that closes the procedure descriptor. */
2011 output_function_exception_table ();
2014 assemble_end_function (decl, fnname);
2016 #ifndef IA64_UNWIND_INFO
2017 /* Otherwise, it feels unclean to switch sections in the middle. */
2018 output_function_exception_table ();
2022 fflush (asm_out_file);
2024 /* Release all memory allocated by flow. */
2025 free_basic_block_vars (0);
2027 /* Release all memory held by regsets now. */
2028 regset_release_memory ();
2030 timevar_pop (TV_FINAL);
2036 /* Run delay slot optimization. */
2038 rest_of_handle_delay_slots (tree decl, rtx insns)
2040 timevar_push (TV_DBR_SCHED);
2041 open_dump_file (DFI_dbr, decl);
2043 dbr_schedule (insns, rtl_dump_file);
2045 close_dump_file (DFI_dbr, print_rtl, insns);
2046 timevar_pop (TV_DBR_SCHED);
2053 /* Convert register usage from flat register file usage to a stack
2056 rest_of_handle_stack_regs (tree decl, rtx insns)
2058 timevar_push (TV_REG_STACK);
2059 open_dump_file (DFI_stack, decl);
2061 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2063 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2064 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2065 && flag_reorder_blocks)
2067 reorder_basic_blocks ();
2068 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2072 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2073 timevar_pop (TV_REG_STACK);
2080 /* Machine independent reorg pass. */
2082 rest_of_handle_machine_reorg (tree decl, rtx insns)
2084 timevar_push (TV_MACH_DEP);
2085 open_dump_file (DFI_mach, decl);
2087 (*targetm.machine_dependent_reorg) ();
2089 close_dump_file (DFI_mach, print_rtl, insns);
2090 timevar_pop (TV_MACH_DEP);
2096 /* Run new register allocator. Return TRUE if we must exit
2097 rest_of_compilation upon return. */
2099 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2103 delete_trivially_dead_insns (insns, max_reg_num ());
2106 timevar_pop (TV_LOCAL_ALLOC);
2107 if (dump_file[DFI_lreg].enabled)
2109 timevar_push (TV_DUMP);
2111 close_dump_file (DFI_lreg, NULL, NULL);
2112 timevar_pop (TV_DUMP);
2115 /* XXX clean up the whole mess to bring live info in shape again. */
2116 timevar_push (TV_GLOBAL_ALLOC);
2117 open_dump_file (DFI_greg, decl);
2119 build_insn_chain (insns);
2120 failure = reload (insns, 0);
2122 timevar_pop (TV_GLOBAL_ALLOC);
2124 if (dump_file[DFI_greg].enabled)
2126 timevar_push (TV_DUMP);
2128 dump_global_regs (rtl_dump_file);
2130 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2131 timevar_pop (TV_DUMP);
2137 reload_completed = 1;
2143 /* Run old register allocator. Return TRUE if we must exit
2144 rest_of_compilation upon return. */
2146 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2150 /* Allocate the reg_renumber array. */
2151 allocate_reg_info (max_regno, FALSE, TRUE);
2153 /* And the reg_equiv_memory_loc array. */
2154 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
2156 allocate_initial_values (reg_equiv_memory_loc);
2158 regclass (insns, max_reg_num (), rtl_dump_file);
2159 *rebuild_notes = local_alloc ();
2161 timevar_pop (TV_LOCAL_ALLOC);
2163 if (dump_file[DFI_lreg].enabled)
2165 timevar_push (TV_DUMP);
2167 dump_flow_info (rtl_dump_file);
2168 dump_local_alloc (rtl_dump_file);
2170 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2171 timevar_pop (TV_DUMP);
2176 timevar_push (TV_GLOBAL_ALLOC);
2177 open_dump_file (DFI_greg, decl);
2179 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2180 pass fixing up any insns that are invalid. */
2183 failure = global_alloc (rtl_dump_file);
2186 build_insn_chain (insns);
2187 failure = reload (insns, 0);
2190 timevar_pop (TV_GLOBAL_ALLOC);
2192 if (dump_file[DFI_greg].enabled)
2194 timevar_push (TV_DUMP);
2196 dump_global_regs (rtl_dump_file);
2198 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2199 timevar_pop (TV_DUMP);
2205 /* Run the regrename and cprop passes. */
2207 rest_of_handle_regrename (tree decl, rtx insns)
2209 timevar_push (TV_RENAME_REGISTERS);
2210 open_dump_file (DFI_rnreg, decl);
2212 if (flag_rename_registers)
2213 regrename_optimize ();
2214 if (flag_cprop_registers)
2215 copyprop_hardreg_forward ();
2217 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2218 timevar_pop (TV_RENAME_REGISTERS);
2221 /* Reorder basic blocks. */
2223 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2225 timevar_push (TV_REORDER_BLOCKS);
2226 open_dump_file (DFI_bbro, decl);
2228 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2229 splitting possibly introduced more crossjumping opportunities. */
2230 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2231 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2233 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2235 if (flag_reorder_blocks)
2236 reorder_basic_blocks ();
2237 if (flag_reorder_blocks
2238 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2239 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2241 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2242 timevar_pop (TV_REORDER_BLOCKS);
2245 #ifdef INSN_SCHEDULING
2246 /* Run instruction scheduler. */
2248 rest_of_handle_sched (tree decl, rtx insns)
2250 timevar_push (TV_SCHED);
2252 /* Print function header into sched dump now
2253 because doing the sched analysis makes some of the dump. */
2254 if (optimize > 0 && flag_schedule_insns)
2256 open_dump_file (DFI_sched, decl);
2258 /* Do control and data sched analysis,
2259 and write some of the results to dump file. */
2261 schedule_insns (rtl_dump_file);
2263 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2265 timevar_pop (TV_SCHED);
2270 /* Run second scheduling pass after reload. */
2272 rest_of_handle_sched2 (tree decl, rtx insns)
2274 timevar_push (TV_SCHED2);
2275 open_dump_file (DFI_sched2, decl);
2277 /* Do control and data sched analysis again,
2278 and write some more of the results to dump file. */
2280 split_all_insns (1);
2282 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2284 schedule_ebbs (rtl_dump_file);
2285 /* No liveness updating code yet, but it should be easy to do.
2286 reg-stack recompute the liveness when needed for now. */
2287 count_or_remove_death_notes (NULL, 1);
2288 cleanup_cfg (CLEANUP_EXPENSIVE);
2291 schedule_insns (rtl_dump_file);
2293 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2294 timevar_pop (TV_SCHED2);
2300 /* Register allocation pre-pass, to reduce number of moves necessary
2301 for two-address machines. */
2303 rest_of_handle_regmove (tree decl, rtx insns)
2305 timevar_push (TV_REGMOVE);
2306 open_dump_file (DFI_regmove, decl);
2308 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2310 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2311 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2312 timevar_pop (TV_REGMOVE);
2319 rest_of_handle_tracer (tree decl, rtx insns)
2321 timevar_push (TV_TRACER);
2322 open_dump_file (DFI_tracer, decl);
2324 dump_flow_info (rtl_dump_file);
2326 cleanup_cfg (CLEANUP_EXPENSIVE);
2327 reg_scan (insns, max_reg_num (), 0);
2328 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2329 timevar_pop (TV_TRACER);
2332 /* If-conversion and CFG cleanup. */
2334 rest_of_handle_if_conversion (tree decl, rtx insns)
2336 open_dump_file (DFI_ce1, decl);
2337 if (flag_if_conversion)
2339 timevar_push (TV_IFCVT);
2341 dump_flow_info (rtl_dump_file);
2342 cleanup_cfg (CLEANUP_EXPENSIVE);
2343 reg_scan (insns, max_reg_num (), 0);
2345 timevar_pop (TV_IFCVT);
2347 timevar_push (TV_JUMP);
2348 cleanup_cfg (CLEANUP_EXPENSIVE);
2349 reg_scan (insns, max_reg_num (), 0);
2350 timevar_pop (TV_JUMP);
2351 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2354 /* Rerun if-conversion, as combine may have simplified things enough
2355 to now meet sequence length restrictions. */
2357 rest_of_handle_if_after_combine (tree decl, rtx insns)
2359 timevar_push (TV_IFCVT);
2360 open_dump_file (DFI_ce2, decl);
2366 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2367 timevar_pop (TV_IFCVT);
2370 /* Do branch profiling and static profile estimation passes. */
2372 rest_of_handle_branch_prob (tree decl, rtx insns)
2376 timevar_push (TV_BRANCH_PROB);
2377 open_dump_file (DFI_bp, decl);
2378 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2381 /* Discover and record the loop depth at the head of each basic
2382 block. The loop infrastructure does the real job for us. */
2383 flow_loops_find (&loops, LOOP_TREE);
2386 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2388 /* Estimate using heuristics if no profiling info is available. */
2389 if (flag_guess_branch_prob)
2390 estimate_probability (&loops);
2392 flow_loops_free (&loops);
2393 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2394 timevar_pop (TV_BRANCH_PROB);
2397 /* Do control and data flow analysis; write some of the results to the
2400 rest_of_handle_cfg (tree decl, rtx insns)
2402 open_dump_file (DFI_cfg, decl);
2404 dump_flow_info (rtl_dump_file);
2406 cleanup_cfg (CLEANUP_EXPENSIVE
2407 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2409 /* It may make more sense to mark constant functions after dead code is
2410 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2411 may insert code making function non-constant, but we still must consider
2412 it as constant, otherwise -fbranch-probabilities will not read data back.
2414 life_analysis rarely eliminates modification of external memory.
2417 mark_constant_function ();
2419 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2422 /* Purge addressofs. */
2424 rest_of_handle_addresof (tree decl, rtx insns)
2426 open_dump_file (DFI_addressof, decl);
2428 purge_addressof (insns);
2430 purge_all_dead_edges (0);
2431 reg_scan (insns, max_reg_num (), 1);
2433 close_dump_file (DFI_addressof, print_rtl, insns);
2436 /* We may have potential sibling or tail recursion sites. Select one
2437 (of possibly multiple) methods of performing the call. */
2439 rest_of_handle_sibling_calls (rtx insns)
2442 optimize_sibling_and_tail_recursive_calls ();
2444 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2445 free_bb_for_insn ();
2446 find_exception_handler_labels ();
2447 rebuild_jump_labels (insns);
2448 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2450 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2451 notes before simplifying cfg and we must do lowering after sibcall
2452 that unhides parts of RTL chain and cleans up the CFG.
2454 Until sibcall is replaced by tree-level optimizer, lets just
2455 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2456 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2457 if (GET_CODE (insn) == NOTE
2458 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2461 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2464 /* Perform jump bypassing and control flow optimizations. */
2466 rest_of_handle_jump_bypass (tree decl, rtx insns)
2468 timevar_push (TV_BYPASS);
2469 open_dump_file (DFI_bypass, decl);
2471 cleanup_cfg (CLEANUP_EXPENSIVE);
2473 if (bypass_jumps (rtl_dump_file))
2475 rebuild_jump_labels (insns);
2476 cleanup_cfg (CLEANUP_EXPENSIVE);
2477 delete_trivially_dead_insns (insns, max_reg_num ());
2480 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2481 timevar_pop (TV_BYPASS);
2485 #ifdef ENABLE_CHECKING
2486 verify_flow_info ();
2490 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2491 if we must exit rest_of_compilation upon return. */
2493 rest_of_handle_inlining (tree decl)
2500 /* If we are reconsidering an inline function at the end of
2501 compilation, skip the stuff for making it inline. */
2502 if (DECL_SAVED_INSNS (decl) != 0)
2505 /* If this is nested inside an inlined external function, pretend
2506 it was only declared. Since we cannot inline such functions,
2507 generating code for this one is not only not necessary but will
2508 confuse some debugging output writers. */
2509 for (parent = DECL_CONTEXT (current_function_decl);
2510 parent != NULL_TREE;
2511 parent = get_containing_scope (parent))
2512 if (TREE_CODE (parent) == FUNCTION_DECL
2513 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2515 DECL_INITIAL (decl) = 0;
2518 else if (TYPE_P (parent))
2519 /* A function in a local class should be treated normally. */
2522 /* If requested, consider whether to make this function inline. */
2523 if ((DECL_INLINE (decl) && !flag_no_inline)
2524 || flag_inline_functions)
2526 timevar_push (TV_INTEGRATION);
2527 lose = function_cannot_inline_p (decl);
2528 timevar_pop (TV_INTEGRATION);
2529 if (lose || ! optimize)
2531 if (warn_inline && DECL_INLINE (decl))
2532 warning_with_decl (decl, lose);
2533 DECL_ABSTRACT_ORIGIN (decl) = 0;
2534 /* Don't really compile an extern inline function.
2535 If we can't make it inline, pretend
2536 it was only declared. */
2537 if (DECL_EXTERNAL (decl))
2539 DECL_INITIAL (decl) = 0;
2544 /* ??? Note that we used to just make it look like if
2545 the "inline" keyword was specified when we decide
2546 to inline it (because of -finline-functions).
2547 garloff@suse.de, 2002-04-24: Add another flag to
2548 actually record this piece of information. */
2549 if (!DECL_INLINE (decl))
2550 DID_INLINE_FUNC (decl) = 1;
2551 inlinable = DECL_INLINE (decl) = 1;
2555 insns = get_insns ();
2557 /* Dump the rtl code if we are dumping rtl. */
2559 if (open_dump_file (DFI_rtl, decl))
2561 if (DECL_SAVED_INSNS (decl))
2562 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2563 close_dump_file (DFI_rtl, print_rtl, insns);
2566 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2567 sorts of eh initialization. Delay this until after the
2568 initial rtl dump so that we can see the original nesting. */
2569 convert_from_eh_region_ranges ();
2571 /* If function is inline, and we don't yet know whether to
2572 compile it by itself, defer decision till end of compilation.
2573 wrapup_global_declarations will (indirectly) call
2574 rest_of_compilation again for those functions that need to
2575 be output. Also defer those functions that we are supposed
2579 || (DECL_INLINE (decl)
2580 && flag_inline_functions
2581 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2582 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2583 && ! flag_keep_inline_functions)
2584 || DECL_EXTERNAL (decl))))
2585 DECL_DEFER_OUTPUT (decl) = 1;
2587 if (DECL_INLINE (decl))
2588 /* DWARF wants separate debugging info for abstract and
2589 concrete instances of all inline functions, including those
2590 declared inline but not inlined, and those inlined even
2591 though they weren't declared inline. Conveniently, that's
2592 what DECL_INLINE means at this point. */
2593 (*debug_hooks->deferred_inline_function) (decl);
2595 if (DECL_DEFER_OUTPUT (decl))
2597 /* If -Wreturn-type, we have to do a bit of compilation. We just
2598 want to call cleanup the cfg to figure out whether or not we can
2599 fall off the end of the function; we do the minimum amount of
2600 work necessary to make that safe. */
2601 if (warn_return_type)
2603 int saved_optimize = optimize;
2606 rebuild_jump_labels (insns);
2607 find_exception_handler_labels ();
2608 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2609 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2610 optimize = saved_optimize;
2612 /* CFG is no longer maintained up-to-date. */
2613 free_bb_for_insn ();
2616 set_nothrow_function_flags ();
2617 if (current_function_nothrow)
2618 /* Now we know that this can't throw; set the flag for the benefit
2619 of other functions later in this translation unit. */
2620 TREE_NOTHROW (current_function_decl) = 1;
2622 timevar_push (TV_INTEGRATION);
2623 save_for_inline (decl);
2624 timevar_pop (TV_INTEGRATION);
2625 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2629 /* If specified extern inline but we aren't inlining it, we are
2630 done. This goes for anything that gets here with DECL_EXTERNAL
2631 set, not just things with DECL_INLINE. */
2632 return (bool) DECL_EXTERNAL (decl);
2635 /* Rest of compilation helper to convert the rtl to SSA form. */
2637 rest_of_handle_ssa (tree decl, rtx insns)
2639 timevar_push (TV_TO_SSA);
2640 open_dump_file (DFI_ssa, decl);
2642 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2645 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2646 timevar_pop (TV_TO_SSA);
2648 /* Perform sparse conditional constant propagation, if requested. */
2651 timevar_push (TV_SSA_CCP);
2652 open_dump_file (DFI_ssa_ccp, decl);
2656 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2657 timevar_pop (TV_SSA_CCP);
2660 /* It would be useful to cleanup the CFG at this point, but block
2661 merging and possibly other transformations might leave a PHI
2662 node in the middle of a basic block, which is a strict no-no. */
2664 /* The SSA implementation uses basic block numbers in its phi
2665 nodes. Thus, changing the control-flow graph or the basic
2666 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2667 may cause problems. */
2671 /* Remove dead code. */
2673 timevar_push (TV_SSA_DCE);
2674 open_dump_file (DFI_ssa_dce, decl);
2676 insns = get_insns ();
2677 ssa_eliminate_dead_code ();
2679 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2680 timevar_pop (TV_SSA_DCE);
2683 /* Convert from SSA form. */
2685 timevar_push (TV_FROM_SSA);
2686 open_dump_file (DFI_ussa, decl);
2688 convert_from_ssa ();
2689 /* New registers have been created. Rescan their usage. */
2690 reg_scan (insns, max_reg_num (), 1);
2692 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2693 timevar_pop (TV_FROM_SSA);
2700 /* Try to identify useless null pointer tests and delete them. */
2702 rest_of_handle_null_pointer (tree decl, rtx insns)
2704 open_dump_file (DFI_null, decl);
2706 dump_flow_info (rtl_dump_file);
2708 if (delete_null_pointer_checks (insns))
2709 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2711 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2714 /* Try combining insns through substitution. */
2716 rest_of_handle_combine (tree decl, rtx insns)
2718 int rebuild_jump_labels_after_combine = 0;
2720 timevar_push (TV_COMBINE);
2721 open_dump_file (DFI_combine, decl);
2723 rebuild_jump_labels_after_combine
2724 = combine_instructions (insns, max_reg_num ());
2726 /* Combining insns may have turned an indirect jump into a
2727 direct jump. Rebuild the JUMP_LABEL fields of jumping
2729 if (rebuild_jump_labels_after_combine)
2731 timevar_push (TV_JUMP);
2732 rebuild_jump_labels (insns);
2733 timevar_pop (TV_JUMP);
2735 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2738 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2739 timevar_pop (TV_COMBINE);
2744 /* Perform life analysis. */
2746 rest_of_handle_life (tree decl, rtx insns)
2748 open_dump_file (DFI_life, decl);
2751 #ifdef ENABLE_CHECKING
2752 verify_flow_info ();
2754 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2756 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2757 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2758 timevar_pop (TV_FLOW);
2760 if (warn_uninitialized)
2762 uninitialized_vars_warning (DECL_INITIAL (decl));
2764 setjmp_args_warning ();
2769 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2771 /* Insns were inserted, and possibly pseudos created, so
2772 things might look a bit different. */
2773 insns = get_insns ();
2774 allocate_reg_life_data ();
2775 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2776 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2782 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2787 /* Perform common subexpression elimination. Nonzero value from
2788 `cse_main' means that jumps were simplified and some code may now
2789 be unreachable, so do jump optimization again. */
2791 rest_of_handle_cse (tree decl, rtx insns)
2795 open_dump_file (DFI_cse, decl);
2797 dump_flow_info (rtl_dump_file);
2798 timevar_push (TV_CSE);
2800 reg_scan (insns, max_reg_num (), 1);
2802 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2804 rebuild_jump_labels (insns);
2805 purge_all_dead_edges (0);
2807 delete_trivially_dead_insns (insns, max_reg_num ());
2809 /* If we are not running more CSE passes, then we are no longer
2810 expecting CSE to be run. But always rerun it in a cheap mode. */
2811 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2813 if (tem || optimize > 1)
2814 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2815 /* Try to identify useless null pointer tests and delete them. */
2816 if (flag_delete_null_pointer_checks)
2818 timevar_push (TV_JUMP);
2820 if (delete_null_pointer_checks (insns))
2821 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2822 timevar_pop (TV_JUMP);
2825 /* The second pass of jump optimization is likely to have
2826 removed a bunch more instructions. */
2827 renumber_insns (rtl_dump_file);
2829 timevar_pop (TV_CSE);
2830 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2833 /* Run second CSE pass after loop optimizations. */
2835 rest_of_handle_cse2 (tree decl, rtx insns)
2839 timevar_push (TV_CSE2);
2840 open_dump_file (DFI_cse2, decl);
2842 dump_flow_info (rtl_dump_file);
2843 /* CFG is no longer maintained up-to-date. */
2844 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2845 purge_all_dead_edges (0);
2846 delete_trivially_dead_insns (insns, max_reg_num ());
2850 timevar_push (TV_JUMP);
2851 rebuild_jump_labels (insns);
2852 cleanup_cfg (CLEANUP_EXPENSIVE);
2853 timevar_pop (TV_JUMP);
2855 reg_scan (insns, max_reg_num (), 0);
2856 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2858 timevar_pop (TV_CSE2);
2861 /* Perform global cse. */
2863 rest_of_handle_gcse (tree decl, rtx insns)
2865 int save_csb, save_cfj;
2868 timevar_push (TV_GCSE);
2869 open_dump_file (DFI_gcse, decl);
2871 tem = gcse_main (insns, rtl_dump_file);
2872 rebuild_jump_labels (insns);
2873 delete_trivially_dead_insns (insns, max_reg_num ());
2875 save_csb = flag_cse_skip_blocks;
2876 save_cfj = flag_cse_follow_jumps;
2877 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2879 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2880 if (current_function_calls_constant_p)
2881 purge_builtin_constant_p ();
2883 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2885 if (flag_expensive_optimizations)
2887 timevar_push (TV_CSE);
2888 reg_scan (insns, max_reg_num (), 1);
2889 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2890 purge_all_dead_edges (0);
2891 delete_trivially_dead_insns (insns, max_reg_num ());
2892 timevar_pop (TV_CSE);
2893 cse_not_expected = !flag_rerun_cse_after_loop;
2896 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2897 things up. Then possibly re-run CSE again. */
2901 timevar_push (TV_JUMP);
2902 rebuild_jump_labels (insns);
2903 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2904 timevar_pop (TV_JUMP);
2906 if (flag_expensive_optimizations)
2908 timevar_push (TV_CSE);
2909 reg_scan (insns, max_reg_num (), 1);
2910 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2911 purge_all_dead_edges (0);
2912 delete_trivially_dead_insns (insns, max_reg_num ());
2913 timevar_pop (TV_CSE);
2917 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2918 timevar_pop (TV_GCSE);
2921 flag_cse_skip_blocks = save_csb;
2922 flag_cse_follow_jumps = save_cfj;
2923 #ifdef ENABLE_CHECKING
2924 verify_flow_info ();
2928 /* Move constant computations out of loops. */
2930 rest_of_handle_loop_optimize (tree decl, rtx insns)
2932 int do_unroll, do_prefetch;
2934 timevar_push (TV_LOOP);
2935 delete_dead_jumptables ();
2936 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2937 open_dump_file (DFI_loop, decl);
2939 /* CFG is no longer maintained up-to-date. */
2940 free_bb_for_insn ();
2942 if (flag_unroll_loops)
2943 do_unroll = 0; /* Having two unrollers is useless. */
2945 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2946 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2948 if (flag_rerun_loop_opt)
2950 cleanup_barriers ();
2952 /* We only want to perform unrolling once. */
2953 loop_optimize (insns, rtl_dump_file, do_unroll);
2956 /* The first call to loop_optimize makes some instructions
2957 trivially dead. We delete those instructions now in the
2958 hope that doing so will make the heuristics in loop work
2959 better and possibly speed up compilation. */
2960 delete_trivially_dead_insns (insns, max_reg_num ());
2962 /* The regscan pass is currently necessary as the alias
2963 analysis code depends on this information. */
2964 reg_scan (insns, max_reg_num (), 1);
2966 cleanup_barriers ();
2967 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2969 /* Loop can create trivially dead instructions. */
2970 delete_trivially_dead_insns (insns, max_reg_num ());
2971 close_dump_file (DFI_loop, print_rtl, insns);
2972 timevar_pop (TV_LOOP);
2973 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2978 /* Perform loop optimizations. It might be better to do them a bit
2979 sooner, but we want the profile feedback to work more
2982 rest_of_handle_loop2 (tree decl, rtx insns)
2984 struct loops *loops;
2985 timevar_push (TV_LOOP);
2986 open_dump_file (DFI_loop2, decl);
2988 dump_flow_info (rtl_dump_file);
2990 loops = loop_optimizer_init (rtl_dump_file);
2994 /* The optimizations: */
2995 if (flag_unswitch_loops)
2996 unswitch_loops (loops);
2998 if (flag_peel_loops || flag_unroll_loops)
2999 unroll_and_peel_loops (loops,
3000 (flag_peel_loops ? UAP_PEEL : 0) |
3001 (flag_unroll_loops ? UAP_UNROLL : 0) |
3002 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3004 loop_optimizer_finalize (loops, rtl_dump_file);
3007 cleanup_cfg (CLEANUP_EXPENSIVE);
3008 delete_trivially_dead_insns (insns, max_reg_num ());
3009 reg_scan (insns, max_reg_num (), 0);
3011 dump_flow_info (rtl_dump_file);
3012 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3013 timevar_pop (TV_LOOP);
3017 /* This is called from finish_function (within langhooks.parse_file)
3018 after each top-level definition is parsed.
3019 It is supposed to compile that function or variable
3020 and output the assembler code for it.
3021 After we return, the tree storage is freed. */
3024 rest_of_compilation (tree decl)
3027 int rebuild_label_notes_after_reload;
3029 timevar_push (TV_REST_OF_COMPILATION);
3031 /* Register rtl specific functions for cfg. */
3032 rtl_register_cfg_hooks ();
3034 /* Now that we're out of the frontend, we shouldn't have any more
3035 CONCATs anywhere. */
3036 generating_concat_p = 0;
3038 /* When processing delayed functions, prepare_function_start() won't
3039 have been run to re-initialize it. */
3040 cse_not_expected = ! optimize;
3042 /* First, make sure that NOTE_BLOCK is set correctly for each
3043 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3044 if (!cfun->x_whole_function_mode_p)
3047 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3048 tree in sensible shape. So, we just recalculate it here. */
3049 if (cfun->x_whole_function_mode_p)
3054 if (rest_of_handle_inlining (decl))
3055 goto exit_rest_of_compilation;
3057 /* If we're emitting a nested function, make sure its parent gets
3058 emitted as well. Doing otherwise confuses debug info. */
3061 for (parent = DECL_CONTEXT (current_function_decl);
3062 parent != NULL_TREE;
3063 parent = get_containing_scope (parent))
3064 if (TREE_CODE (parent) == FUNCTION_DECL)
3065 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3068 /* We are now committed to emitting code for this function. Do any
3069 preparation, such as emitting abstract debug info for the inline
3070 before it gets mangled by optimization. */
3071 if (DECL_INLINE (decl))
3072 (*debug_hooks->outlining_inline_function) (decl);
3074 /* Remove any notes we don't need. That will make iterating
3075 over the instruction sequence faster, and allow the garbage
3076 collector to reclaim the memory used by the notes. */
3077 remove_unnecessary_notes ();
3082 /* Initialize some variables used by the optimizers. */
3083 init_function_for_compilation ();
3085 if (! DECL_DEFER_OUTPUT (decl))
3086 TREE_ASM_WRITTEN (decl) = 1;
3088 /* Now that integrate will no longer see our rtl, we need not
3089 distinguish between the return value of this function and the
3090 return value of called functions. Also, we can remove all SETs
3091 of subregs of hard registers; they are only here because of
3092 integrate. Also, we can now initialize pseudos intended to
3093 carry magic hard reg data throughout the function. */
3094 rtx_equal_function_value_matters = 0;
3095 purge_hard_subreg_sets (get_insns ());
3097 /* Early return if there were errors. We can run afoul of our
3098 consistency checks, and there's not really much point in fixing them.
3099 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3100 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3101 || errorcount || sorrycount)
3102 goto exit_rest_of_compilation;
3104 timevar_push (TV_JUMP);
3105 open_dump_file (DFI_sibling, decl);
3106 insns = get_insns ();
3107 rebuild_jump_labels (insns);
3108 find_exception_handler_labels ();
3109 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3111 delete_unreachable_blocks ();
3113 /* We have to issue these warnings now already, because CFG cleanups
3114 further down may destroy the required information. */
3115 check_function_return_warnings ();
3117 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3118 if (flag_guess_branch_prob)
3120 timevar_push (TV_BRANCH_PROB);
3121 note_prediction_to_br_prob ();
3122 timevar_pop (TV_BRANCH_PROB);
3125 if (flag_optimize_sibling_calls)
3126 rest_of_handle_sibling_calls (insns);
3128 timevar_pop (TV_JUMP);
3130 insn_locators_initialize ();
3131 /* Complete generation of exception handling code. */
3134 timevar_push (TV_JUMP);
3135 open_dump_file (DFI_eh, decl);
3137 finish_eh_generation ();
3139 close_dump_file (DFI_eh, print_rtl, get_insns ());
3140 timevar_pop (TV_JUMP);
3143 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3144 generation, which might create new sets. */
3145 emit_initial_value_sets ();
3148 /* If we are doing position-independent code generation, now
3149 is the time to output special prologues and epilogues.
3150 We do not want to do this earlier, because it just clutters
3151 up inline functions with meaningless insns. */
3156 insns = get_insns ();
3158 /* Copy any shared structure that should not be shared. */
3159 unshare_all_rtl (current_function_decl, insns);
3161 #ifdef SETJMP_VIA_SAVE_AREA
3162 /* This must be performed before virtual register instantiation.
3163 Please be aware the everything in the compiler that can look
3164 at the RTL up to this point must understand that REG_SAVE_AREA
3165 is just like a use of the REG contained inside. */
3166 if (current_function_calls_alloca)
3167 optimize_save_area_alloca (insns);
3170 /* Instantiate all virtual registers. */
3171 instantiate_virtual_regs (current_function_decl, insns);
3173 open_dump_file (DFI_jump, decl);
3175 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3176 are initialized and to compute whether control can drop off the end
3179 timevar_push (TV_JUMP);
3180 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3181 before jump optimization switches branch directions. */
3182 if (flag_guess_branch_prob)
3183 expected_value_to_br_prob ();
3185 reg_scan (insns, max_reg_num (), 0);
3186 rebuild_jump_labels (insns);
3187 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3188 delete_trivially_dead_insns (insns, max_reg_num ());
3190 dump_flow_info (rtl_dump_file);
3191 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3192 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3196 free_bb_for_insn ();
3197 copy_loop_headers (insns);
3198 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3200 purge_line_number_notes (insns);
3202 timevar_pop (TV_JUMP);
3203 close_dump_file (DFI_jump, print_rtl, insns);
3205 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3206 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3207 goto exit_rest_of_compilation;
3209 /* Long term, this should probably move before the jump optimizer too,
3210 but I didn't want to disturb the rtl_dump_and_exit and related
3211 stuff at this time. */
3212 if (optimize > 0 && flag_ssa)
3213 insns = rest_of_handle_ssa (decl, insns);
3215 timevar_push (TV_JUMP);
3218 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3220 if (flag_delete_null_pointer_checks)
3221 rest_of_handle_null_pointer (decl, insns);
3223 /* Jump optimization, and the removal of NULL pointer checks, may
3224 have reduced the number of instructions substantially. CSE, and
3225 future passes, allocate arrays whose dimensions involve the
3226 maximum instruction UID, so if we can reduce the maximum UID
3227 we'll save big on memory. */
3228 renumber_insns (rtl_dump_file);
3229 timevar_pop (TV_JUMP);
3231 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3236 rest_of_handle_cse (decl, insns);
3238 rest_of_handle_addresof (decl, insns);
3245 rest_of_handle_gcse (decl, insns);
3247 if (flag_loop_optimize)
3248 rest_of_handle_loop_optimize (decl, insns);
3251 rest_of_handle_jump_bypass (decl, insns);
3254 timevar_push (TV_FLOW);
3256 rest_of_handle_cfg (decl, insns);
3259 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3260 rest_of_handle_branch_prob (decl, insns);
3263 rest_of_handle_if_conversion (decl, insns);
3266 rest_of_handle_tracer (decl, insns);
3269 && (flag_unswitch_loops
3271 || flag_unroll_loops))
3272 rest_of_handle_loop2 (decl, insns);
3274 if (flag_rerun_cse_after_loop)
3275 rest_of_handle_cse2 (decl, insns);
3277 cse_not_expected = 1;
3279 rest_of_handle_life (decl, insns);
3282 rest_of_handle_combine (decl, insns);
3284 if (flag_if_conversion)
3285 rest_of_handle_if_after_combine (decl, insns);
3287 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3288 rest_of_handle_regmove (decl, insns);
3290 /* Do unconditional splitting before register allocation to allow machine
3291 description to add extra information not needed previously. */
3292 split_all_insns (1);
3294 #ifdef OPTIMIZE_MODE_SWITCHING
3295 timevar_push (TV_MODE_SWITCH);
3298 optimize_mode_switching (NULL);
3301 timevar_pop (TV_MODE_SWITCH);
3304 /* Any of the several passes since flow1 will have munged register
3305 lifetime data a bit. We need it to be up to date for scheduling
3306 (see handling of reg_known_equiv in init_alias_analysis). */
3307 recompute_reg_usage (insns, !optimize_size);
3309 #ifdef INSN_SCHEDULING
3310 rest_of_handle_sched (decl, insns);
3313 /* Determine if the current function is a leaf before running reload
3314 since this can impact optimizations done by the prologue and
3315 epilogue thus changing register elimination offsets. */
3316 current_function_is_leaf = leaf_function_p ();
3318 timevar_push (TV_LOCAL_ALLOC);
3319 open_dump_file (DFI_lreg, decl);
3321 if (flag_new_regalloc)
3323 if (rest_of_handle_new_regalloc (decl, insns,
3324 &rebuild_label_notes_after_reload))
3325 goto exit_rest_of_compilation;
3329 if (rest_of_handle_old_regalloc (decl, insns,
3330 &rebuild_label_notes_after_reload))
3331 goto exit_rest_of_compilation;
3336 open_dump_file (DFI_postreload, decl);
3338 /* Do a very simple CSE pass over just the hard registers. */
3341 timevar_push (TV_RELOAD_CSE_REGS);
3342 reload_cse_regs (insns);
3343 timevar_pop (TV_RELOAD_CSE_REGS);
3346 /* Register allocation and reloading may have turned an indirect jump into
3347 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3348 jumping instructions. */
3349 if (rebuild_label_notes_after_reload)
3351 timevar_push (TV_JUMP);
3353 rebuild_jump_labels (insns);
3354 purge_all_dead_edges (0);
3356 timevar_pop (TV_JUMP);
3359 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3361 /* Re-create the death notes which were deleted during reload. */
3362 timevar_push (TV_FLOW2);
3363 open_dump_file (DFI_flow2, decl);
3365 #ifdef ENABLE_CHECKING
3366 verify_flow_info ();
3369 /* If optimizing, then go ahead and split insns now. */
3373 split_all_insns (0);
3375 if (flag_branch_target_load_optimize)
3377 open_dump_file (DFI_branch_target_load, decl);
3379 branch_target_load_optimize (insns, false);
3381 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3387 cleanup_cfg (CLEANUP_EXPENSIVE);
3389 /* On some machines, the prologue and epilogue code, or parts thereof,
3390 can be represented as RTL. Doing so lets us schedule insns between
3391 it and the rest of the code and also allows delayed branch
3392 scheduling to operate in the epilogue. */
3393 thread_prologue_and_epilogue_insns (insns);
3394 epilogue_completed = 1;
3398 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3399 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3400 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3402 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3403 even for machines with possibly nonzero RETURN_POPS_ARGS
3404 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3405 push instructions will have popping returns. */
3406 #ifndef PUSH_ROUNDING
3407 if (!ACCUMULATE_OUTGOING_ARGS)
3409 combine_stack_adjustments ();
3414 flow2_completed = 1;
3416 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3417 timevar_pop (TV_FLOW2);
3419 #ifdef HAVE_peephole2
3420 if (optimize > 0 && flag_peephole2)
3422 timevar_push (TV_PEEPHOLE2);
3423 open_dump_file (DFI_peephole2, decl);
3425 peephole2_optimize (rtl_dump_file);
3427 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3428 timevar_pop (TV_PEEPHOLE2);
3434 if (flag_rename_registers || flag_cprop_registers)
3435 rest_of_handle_regrename (decl, insns);
3437 rest_of_handle_reorder_blocks (decl, insns);
3440 if (flag_if_conversion2)
3442 timevar_push (TV_IFCVT2);
3443 open_dump_file (DFI_ce3, decl);
3447 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3448 timevar_pop (TV_IFCVT2);
3451 if (flag_branch_target_load_optimize2)
3453 /* Leave this a warning for now so that it is possible to experiment
3454 with running this pass twice. In 3.6, we should either make this
3455 an error, or use separate dump files. */
3456 if (flag_branch_target_load_optimize)
3457 warning ("branch target register load optimization is not intended "
3460 open_dump_file (DFI_branch_target_load, decl);
3462 branch_target_load_optimize (insns, true);
3464 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3469 #ifdef INSN_SCHEDULING
3470 if (optimize > 0 && flag_schedule_insns_after_reload)
3471 rest_of_handle_sched2 (decl, insns);
3474 #ifdef LEAF_REGISTERS
3475 current_function_uses_only_leaf_regs
3476 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3480 rest_of_handle_stack_regs (decl, insns);
3483 compute_alignments ();
3485 /* CFG is no longer maintained up-to-date. */
3486 free_bb_for_insn ();
3488 if (targetm.machine_dependent_reorg != 0)
3489 rest_of_handle_machine_reorg (decl, insns);
3491 purge_line_number_notes (insns);
3492 cleanup_barriers ();
3495 if (optimize > 0 && flag_delayed_branch)
3496 rest_of_handle_delay_slots (decl, insns);
3499 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3500 timevar_push (TV_SHORTEN_BRANCH);
3501 split_all_insns_noflow ();
3502 timevar_pop (TV_SHORTEN_BRANCH);
3505 convert_to_eh_region_ranges ();
3507 /* Shorten branches. */
3508 timevar_push (TV_SHORTEN_BRANCH);
3509 shorten_branches (get_insns ());
3510 timevar_pop (TV_SHORTEN_BRANCH);
3512 set_nothrow_function_flags ();
3513 if (current_function_nothrow)
3514 /* Now we know that this can't throw; set the flag for the benefit
3515 of other functions later in this translation unit. */
3516 TREE_NOTHROW (current_function_decl) = 1;
3518 rest_of_handle_final (decl, insns);
3520 /* Write DBX symbols if requested. */
3522 /* Note that for those inline functions where we don't initially
3523 know for certain that we will be generating an out-of-line copy,
3524 the first invocation of this routine (rest_of_compilation) will
3525 skip over this code by doing a `goto exit_rest_of_compilation;'.
3526 Later on, wrapup_global_declarations will (indirectly) call
3527 rest_of_compilation again for those inline functions that need
3528 to have out-of-line copies generated. During that call, we
3529 *will* be routed past here. */
3531 timevar_push (TV_SYMOUT);
3532 (*debug_hooks->function_decl) (decl);
3533 timevar_pop (TV_SYMOUT);
3535 exit_rest_of_compilation:
3537 coverage_end_function ();
3539 /* In case the function was not output,
3540 don't leave any temporary anonymous types
3541 queued up for sdb output. */
3542 #ifdef SDB_DEBUGGING_INFO
3543 if (write_symbols == SDB_DEBUG)
3544 sdbout_types (NULL_TREE);
3547 reload_completed = 0;
3548 epilogue_completed = 0;
3549 flow2_completed = 0;
3552 timevar_push (TV_FINAL);
3554 /* Clear out the insn_length contents now that they are no
3556 init_insn_lengths ();
3558 /* Show no temporary slots allocated. */
3561 free_basic_block_vars (0);
3562 free_bb_for_insn ();
3564 timevar_pop (TV_FINAL);
3566 if ((*targetm.binds_local_p) (current_function_decl))
3568 int pref = cfun->preferred_stack_boundary;
3569 if (cfun->recursive_call_emit
3570 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3571 pref = cfun->stack_alignment_needed;
3572 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3576 /* Make sure volatile mem refs aren't considered valid operands for
3577 arithmetic insns. We must call this here if this is a nested inline
3578 function, since the above code leaves us in the init_recog state
3579 (from final.c), and the function context push/pop code does not
3580 save/restore volatile_ok.
3582 ??? Maybe it isn't necessary for expand_start_function to call this
3583 anymore if we do it here? */
3585 init_recog_no_volatile ();
3587 /* We're done with this function. Free up memory if we can. */
3588 free_after_parsing (cfun);
3589 if (! DECL_DEFER_OUTPUT (decl))
3591 free_after_compilation (cfun);
3593 /* Clear integrate.c's pointer to the cfun structure we just
3595 DECL_SAVED_INSNS (decl) = 0;
3601 timevar_pop (TV_REST_OF_COMPILATION);
3604 /* Display help for generic options. */
3612 for (i = LAST_PARAM; i--;)
3614 const char *description = compiler_params[i].help;
3615 const int length = 21 - strlen (compiler_params[i].option);
3617 if (description != NULL && *description != 0)
3618 printf (" --param %s=<value>%.*s%s\n",
3619 compiler_params[i].option,
3620 length > 0 ? length : 1, " ",
3624 for (i = ARRAY_SIZE (debug_args); i--;)
3626 if (debug_args[i].description != NULL)
3627 printf (" -g%-21s %s\n",
3628 debug_args[i].arg, _(debug_args[i].description));
3634 /* Display descriptions of language specific options.
3635 If there is no description, note that there is an undocumented option.
3636 If the description is empty, do not display anything. (This allows
3637 options to be deliberately undocumented, for whatever reason).
3638 If the option string is missing, then this is a marker, indicating
3639 that the description string is in fact the name of a language, whose
3640 language specific options are to follow. */
3642 if (ARRAY_SIZE (documented_lang_options) > 1)
3644 printf (_("\nLanguage specific options:\n"));
3646 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3648 const char *description = documented_lang_options[i].description;
3649 const char *option = documented_lang_options[i].option;
3651 if (description == NULL)
3656 printf (_(" %-23s [undocumented]\n"), option);
3658 else if (*description == 0)
3660 else if (option == NULL)
3664 (_("\nThere are undocumented %s specific options as well.\n"),
3668 printf (_("\n Options for %s:\n"), description);
3673 printf (" %-23s %s\n", option, _(description));
3678 printf (_("\nThere are undocumented %s specific options as well.\n"),
3681 display_target_options ();
3684 /* Display help for target options. */
3686 display_target_options (void)
3689 static bool displayed = false;
3691 /* Avoid double printing for --help --target-help. */
3697 if (ARRAY_SIZE (target_switches) > 1
3698 #ifdef TARGET_OPTIONS
3699 || ARRAY_SIZE (target_options) > 1
3707 printf (_("\nTarget specific options:\n"));
3709 for (i = ARRAY_SIZE (target_switches); i--;)
3711 const char *option = target_switches[i].name;
3712 const char *description = target_switches[i].description;
3714 if (option == NULL || *option == 0)
3716 else if (description == NULL)
3721 printf (_(" -m%-23s [undocumented]\n"), option);
3723 else if (*description != 0)
3724 doc += printf (" -m%-23s %s\n", option, _(description));
3727 #ifdef TARGET_OPTIONS
3728 for (i = ARRAY_SIZE (target_options); i--;)
3730 const char *option = target_options[i].prefix;
3731 const char *description = target_options[i].description;
3733 if (option == NULL || *option == 0)
3735 else if (description == NULL)
3740 printf (_(" -m%-23s [undocumented]\n"), option);
3742 else if (*description != 0)
3743 doc += printf (" -m%-23s %s\n", option, _(description));
3749 printf (_("\nThere are undocumented target specific options as well.\n"));
3751 printf (_(" They exist, but they are not documented.\n"));
3756 /* Parse a -d... command line switch. */
3759 decode_d_option (const char *arg)
3767 for (i = 0; i < (int) DFI_MAX; ++i)
3768 dump_file[i].enabled = 1;
3774 flag_print_asm_name = 1;
3777 flag_dump_rtl_in_asm = 1;
3778 flag_print_asm_name = 1;
3781 graph_dump_format = vcg;
3784 rtl_dump_and_exit = 1;
3789 case 'D': /* These are handled by the preprocessor. */
3793 setup_core_dumping();
3798 for (i = 0; i < (int) DFI_MAX; ++i)
3799 if (c == dump_file[i].debug_switch)
3801 dump_file[i].enabled = 1;
3806 warning ("unrecognized gcc debugging option: %c", c);
3811 /* Indexed by enum debug_info_type. */
3812 const char *const debug_type_names[] =
3814 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3817 /* Parse a -g... command line switch. ARG is the value after the -g.
3818 It is safe to access 'ARG - 2' to generate the full switch name.
3819 Return the number of strings consumed. */
3822 decode_g_option (const char *arg)
3824 static unsigned level = 0;
3825 /* A lot of code assumes write_symbols == NO_DEBUG if the
3826 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3827 of what debugging type has been selected). This records the
3828 selected type. It is an error to specify more than one
3830 static enum debug_info_type selected_debug_type = NO_DEBUG;
3831 /* Nonzero if debugging format has been explicitly set.
3832 -g and -ggdb don't explicitly set the debugging format so
3833 -gdwarf -g3 is equivalent to -gdwarf3. */
3834 static int type_explicitly_set_p = 0;
3836 /* The maximum admissible debug level value. */
3837 static const unsigned max_debug_level = 3;
3839 /* Look up ARG in the table. */
3840 for (da = debug_args; da->arg; da++)
3842 const int da_len = strlen (da->arg);
3844 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3846 enum debug_info_type type = da->debug_type;
3847 const char *p = arg + da_len;
3849 if (*p && ! ISDIGIT (*p))
3852 /* A debug flag without a level defaults to level 2.
3853 Note we do not want to call read_integral_parameter
3854 for that case since it will call atoi which
3857 ??? We may want to generalize the interface to
3858 read_integral_parameter to better handle this case
3859 if this case shows up often. */
3861 level = read_integral_parameter (p, 0, max_debug_level + 1);
3863 level = (level == 0) ? 2 : level;
3865 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3867 error ("use -gdwarf -g%d for DWARF v1, level %d",
3870 error ("use -gdwarf-2 for DWARF v2");
3873 if (level > max_debug_level)
3876 ignoring option `%s' due to invalid debug level specification",
3878 level = debug_info_level;
3881 if (type == NO_DEBUG)
3883 type = PREFERRED_DEBUGGING_TYPE;
3885 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3887 #ifdef DWARF2_DEBUGGING_INFO
3888 type = DWARF2_DEBUG;
3890 #ifdef DBX_DEBUGGING_INFO
3897 if (type == NO_DEBUG)
3898 warning ("`%s': unknown or unsupported -g option", arg - 2);
3900 /* Does it conflict with an already selected type? */
3901 if (type_explicitly_set_p
3902 /* -g/-ggdb don't conflict with anything. */
3903 && da->debug_type != NO_DEBUG
3904 && type != selected_debug_type)
3905 warning ("`%s' ignored, conflicts with `-g%s'",
3906 arg - 2, debug_type_names[(int) selected_debug_type]);
3909 /* If the format has already been set, -g/-ggdb
3910 only change the debug level. */
3911 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
3912 /* Don't change debugging type. */
3916 selected_debug_type = type;
3917 type_explicitly_set_p = da->debug_type != NO_DEBUG;
3920 write_symbols = (level == 0
3922 : selected_debug_type);
3923 use_gnu_debug_info_extensions = da->use_extensions_p;
3924 debug_info_level = (enum debug_info_level) level;
3932 warning ("`-g%s': unknown or unsupported -g option", arg);
3935 /* Decode -m switches. */
3936 /* Decode the switch -mNAME. */
3939 set_target_switch (const char *name)
3942 int valid_target_option = 0;
3944 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3945 if (!strcmp (target_switches[j].name, name))
3947 if (target_switches[j].value < 0)
3948 target_flags &= ~-target_switches[j].value;
3950 target_flags |= target_switches[j].value;
3953 if (target_switches[j].value < 0)
3954 target_flags_explicit |= -target_switches[j].value;
3956 target_flags_explicit |= target_switches[j].value;
3958 valid_target_option = 1;
3961 #ifdef TARGET_OPTIONS
3962 if (!valid_target_option)
3963 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3965 int len = strlen (target_options[j].prefix);
3966 if (target_options[j].value)
3968 if (!strcmp (target_options[j].prefix, name))
3970 *target_options[j].variable = target_options[j].value;
3971 valid_target_option = 1;
3976 if (!strncmp (target_options[j].prefix, name, len))
3978 *target_options[j].variable = name + len;
3979 valid_target_option = 1;
3985 if (!valid_target_option)
3986 error ("invalid option `%s'", name);
3989 /* Print version information to FILE.
3990 Each line begins with INDENT (for the case where FILE is the
3991 assembler output file). */
3994 print_version (FILE *file, const char *indent)
3997 #define __VERSION__ "[?]"
4001 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4003 "%s%s%s version %s (%s) compiled by CC.\n"
4005 , indent, *indent != 0 ? " " : "",
4006 lang_hooks.name, version_string, TARGET_NAME,
4007 indent, __VERSION__);
4008 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4009 indent, *indent != 0 ? " " : "",
4010 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4013 /* Print an option value and return the adjusted position in the line.
4014 ??? We don't handle error returns from fprintf (disk full); presumably
4015 other code will catch a disk full though. */
4018 print_single_switch (FILE *file, int pos, int max,
4019 const char *indent, const char *sep, const char *term,
4020 const char *type, const char *name)
4022 /* The ultrix fprintf returns 0 on success, so compute the result we want
4023 here since we need it for the following test. */
4024 int len = strlen (sep) + strlen (type) + strlen (name);
4029 fprintf (file, "%s", term);
4034 fprintf (file, "%s", indent);
4035 pos = strlen (indent);
4037 fprintf (file, "%s%s%s", sep, type, name);
4042 /* Print active target switches to FILE.
4043 POS is the current cursor position and MAX is the size of a "line".
4044 Each line begins with INDENT and ends with TERM.
4045 Each switch is separated from the next by SEP. */
4048 print_switch_values (FILE *file, int pos, int max,
4049 const char *indent, const char *sep, const char *term)
4054 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4055 that it can be printed below. This helps reproducibility. */
4058 /* Print the options as passed. */
4059 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4060 _("options passed: "), "");
4062 for (p = &save_argv[1]; *p != NULL; p++)
4066 if (strcmp (*p, "-o") == 0)
4072 if (strcmp (*p, "-quiet") == 0)
4074 if (strcmp (*p, "-version") == 0)
4079 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4082 fprintf (file, "%s", term);
4084 /* Print the -f and -m options that have been enabled.
4085 We don't handle language specific options but printing argv
4088 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4089 _("options enabled: "), "");
4091 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4092 if (*f_options[j].variable == f_options[j].on_value)
4093 pos = print_single_switch (file, pos, max, indent, sep, term,
4094 "-f", f_options[j].string);
4096 /* Print target specific options. */
4098 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4099 if (target_switches[j].name[0] != '\0'
4100 && target_switches[j].value > 0
4101 && ((target_switches[j].value & target_flags)
4102 == target_switches[j].value))
4104 pos = print_single_switch (file, pos, max, indent, sep, term,
4105 "-m", target_switches[j].name);
4108 #ifdef TARGET_OPTIONS
4109 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4110 if (*target_options[j].variable != NULL)
4113 sprintf (prefix, "-m%s", target_options[j].prefix);
4114 pos = print_single_switch (file, pos, max, indent, sep, term,
4115 prefix, *target_options[j].variable);
4119 fprintf (file, "%s", term);
4122 /* Open assembly code output file. Do this even if -fsyntax-only is
4123 on, because then the driver will have provided the name of a
4124 temporary file or bit bucket for us. NAME is the file specified on
4125 the command line, possibly NULL. */
4127 init_asm_output (const char *name)
4129 if (name == NULL && asm_file_name == 0)
4130 asm_out_file = stdout;
4133 if (asm_file_name == 0)
4135 int len = strlen (dump_base_name);
4136 char *dumpname = (char *) xmalloc (len + 6);
4137 memcpy (dumpname, dump_base_name, len + 1);
4138 strip_off_ending (dumpname, len);
4139 strcat (dumpname, ".s");
4140 asm_file_name = dumpname;
4142 if (!strcmp (asm_file_name, "-"))
4143 asm_out_file = stdout;
4145 asm_out_file = fopen (asm_file_name, "w+");
4146 if (asm_out_file == 0)
4147 fatal_error ("can't open %s for writing: %m", asm_file_name);
4150 #ifdef IO_BUFFER_SIZE
4151 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4152 _IOFBF, IO_BUFFER_SIZE);
4155 if (!flag_syntax_only)
4157 targetm.asm_out.file_start ();
4159 #ifdef ASM_COMMENT_START
4160 if (flag_verbose_asm)
4162 /* Print the list of options in effect. */
4163 print_version (asm_out_file, ASM_COMMENT_START);
4164 print_switch_values (asm_out_file, 0, MAX_LINE,
4165 ASM_COMMENT_START, " ", "\n");
4166 /* Add a blank line here so it appears in assembler output but not
4168 fprintf (asm_out_file, "\n");
4174 /* Initialization of the front end environment, before command line
4175 options are parsed. Signal handlers, internationalization etc.
4176 ARGV0 is main's argv[0]. */
4178 general_init (const char *argv0)
4182 p = argv0 + strlen (argv0);
4183 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4187 xmalloc_set_program_name (progname);
4191 gcc_init_libintl ();
4193 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4195 signal (SIGSEGV, crash_signal);
4198 signal (SIGILL, crash_signal);
4201 signal (SIGBUS, crash_signal);
4204 signal (SIGABRT, crash_signal);
4206 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4207 signal (SIGIOT, crash_signal);
4210 signal (SIGFPE, crash_signal);
4213 /* Other host-specific signal setup. */
4214 (*host_hooks.extra_signals)();
4216 /* Initialize the diagnostics reporting machinery, so option parsing
4217 can give warnings and errors. */
4218 diagnostic_initialize (global_dc);
4220 /* Initialize the garbage-collector, string pools and tree type hash
4226 /* Initialize register usage now so switches may override. */
4229 /* Register the language-independent parameters. */
4230 add_params (lang_independent_params, LAST_PARAM);
4232 /* This must be done after add_params but before argument processing. */
4233 init_ggc_heuristics();
4236 /* Process the options that have been parsed. */
4238 process_options (void)
4240 /* Allow the front end to perform consistency checks and do further
4241 initialization based on the command line options. This hook also
4242 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4243 so we can correctly initialize debug output. */
4244 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4245 input_filename = main_input_filename;
4247 #ifdef OVERRIDE_OPTIONS
4248 /* Some machines may reject certain combinations of options. */
4252 /* Set aux_base_name if not already set. */
4255 else if (main_input_filename)
4257 char *name = xstrdup (lbasename (main_input_filename));
4259 strip_off_ending (name, strlen (name));
4260 aux_base_name = name;
4263 aux_base_name = "gccaux";
4265 /* Set up the align_*_log variables, defaulting them to 1 if they
4266 were still unset. */
4267 if (align_loops <= 0) align_loops = 1;
4268 if (align_loops_max_skip > align_loops || !align_loops)
4269 align_loops_max_skip = align_loops - 1;
4270 align_loops_log = floor_log2 (align_loops * 2 - 1);
4271 if (align_jumps <= 0) align_jumps = 1;
4272 if (align_jumps_max_skip > align_jumps || !align_jumps)
4273 align_jumps_max_skip = align_jumps - 1;
4274 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4275 if (align_labels <= 0) align_labels = 1;
4276 align_labels_log = floor_log2 (align_labels * 2 - 1);
4277 if (align_labels_max_skip > align_labels || !align_labels)
4278 align_labels_max_skip = align_labels - 1;
4279 if (align_functions <= 0) align_functions = 1;
4280 align_functions_log = floor_log2 (align_functions * 2 - 1);
4282 /* Unrolling all loops implies that standard loop unrolling must also
4284 if (flag_unroll_all_loops)
4285 flag_unroll_loops = 1;
4287 if (flag_unroll_loops)
4289 flag_old_unroll_loops = 0;
4290 flag_old_unroll_all_loops = 0;
4293 if (flag_old_unroll_all_loops)
4294 flag_old_unroll_loops = 1;
4296 /* Old loop unrolling requires that strength_reduction be on also. Silently
4297 turn on strength reduction here if it isn't already on. Also, the loop
4298 unrolling code assumes that cse will be run after loop, so that must
4299 be turned on also. */
4300 if (flag_old_unroll_loops)
4302 flag_strength_reduce = 1;
4303 flag_rerun_cse_after_loop = 1;
4305 if (flag_unroll_loops || flag_peel_loops)
4306 flag_rerun_cse_after_loop = 1;
4308 if (flag_non_call_exceptions)
4309 flag_asynchronous_unwind_tables = 1;
4310 if (flag_asynchronous_unwind_tables)
4311 flag_unwind_tables = 1;
4313 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4315 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4316 flag_unit_at_a_time = 0;
4318 /* Warn about options that are not supported on this machine. */
4319 #ifndef INSN_SCHEDULING
4320 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4321 warning ("instruction scheduling not supported on this target machine");
4324 if (flag_delayed_branch)
4325 warning ("this target machine does not have delayed branches");
4328 user_label_prefix = USER_LABEL_PREFIX;
4329 if (flag_leading_underscore != -1)
4331 /* If the default prefix is more complicated than "" or "_",
4332 issue a warning and ignore this option. */
4333 if (user_label_prefix[0] == 0 ||
4334 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4336 user_label_prefix = flag_leading_underscore ? "_" : "";
4339 warning ("-f%sleading-underscore not supported on this target machine",
4340 flag_leading_underscore ? "" : "no-");
4343 /* If we are in verbose mode, write out the version and maybe all the
4344 option flags in use. */
4347 print_version (stderr, "");
4349 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4352 if (flag_syntax_only)
4354 write_symbols = NO_DEBUG;
4358 /* Now we know write_symbols, set up the debug hooks based on it.
4359 By default we do nothing for debug output. */
4360 #if defined(DBX_DEBUGGING_INFO)
4361 if (write_symbols == DBX_DEBUG)
4362 debug_hooks = &dbx_debug_hooks;
4364 #if defined(XCOFF_DEBUGGING_INFO)
4365 if (write_symbols == XCOFF_DEBUG)
4366 debug_hooks = &xcoff_debug_hooks;
4368 #ifdef SDB_DEBUGGING_INFO
4369 if (write_symbols == SDB_DEBUG)
4370 debug_hooks = &sdb_debug_hooks;
4372 #ifdef DWARF_DEBUGGING_INFO
4373 if (write_symbols == DWARF_DEBUG)
4374 debug_hooks = &dwarf_debug_hooks;
4376 #ifdef DWARF2_DEBUGGING_INFO
4377 if (write_symbols == DWARF2_DEBUG)
4378 debug_hooks = &dwarf2_debug_hooks;
4380 #ifdef VMS_DEBUGGING_INFO
4381 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4382 debug_hooks = &vmsdbg_debug_hooks;
4385 /* If auxiliary info generation is desired, open the output file.
4386 This goes in the same directory as the source file--unlike
4387 all the other output files. */
4388 if (flag_gen_aux_info)
4390 aux_info_file = fopen (aux_info_file_name, "w");
4391 if (aux_info_file == 0)
4392 fatal_error ("can't open %s: %m", aux_info_file_name);
4395 if (! targetm.have_named_sections)
4397 if (flag_function_sections)
4399 warning ("-ffunction-sections not supported for this target");
4400 flag_function_sections = 0;
4402 if (flag_data_sections)
4404 warning ("-fdata-sections not supported for this target");
4405 flag_data_sections = 0;
4409 if (flag_function_sections && profile_flag)
4411 warning ("-ffunction-sections disabled; it makes profiling impossible");
4412 flag_function_sections = 0;
4415 #ifndef HAVE_prefetch
4416 if (flag_prefetch_loop_arrays)
4418 warning ("-fprefetch-loop-arrays not supported for this target");
4419 flag_prefetch_loop_arrays = 0;
4422 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4424 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4425 flag_prefetch_loop_arrays = 0;
4429 /* This combination of options isn't handled for i386 targets and doesn't
4430 make much sense anyway, so don't allow it. */
4431 if (flag_prefetch_loop_arrays && optimize_size)
4433 warning ("-fprefetch-loop-arrays is not supported with -Os");
4434 flag_prefetch_loop_arrays = 0;
4437 #ifndef OBJECT_FORMAT_ELF
4438 if (flag_function_sections && write_symbols != NO_DEBUG)
4439 warning ("-ffunction-sections may affect debugging on some targets");
4442 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4443 if (flag_signaling_nans)
4444 flag_trapping_math = 1;
4447 /* Initialize the compiler back end. */
4451 /* init_emit_once uses reg_raw_mode and therefore must be called
4452 after init_regs which initialized reg_raw_mode. */
4454 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4455 || debug_info_level == DINFO_LEVEL_VERBOSE
4456 #ifdef VMS_DEBUGGING_INFO
4457 /* Enable line number info for traceback. */
4458 || debug_info_level > DINFO_LEVEL_NONE
4460 || flag_test_coverage
4461 || warn_notreached);
4462 init_fake_stack_mems ();
4466 init_function_once ();
4467 init_varasm_once ();
4469 /* The following initialization functions need to generate rtl, so
4470 provide a dummy function context for them. */
4471 init_dummy_function_start ();
4473 if (flag_caller_saves)
4474 init_caller_save ();
4475 expand_dummy_function_end ();
4478 /* Language-dependent initialization. Returns nonzero on success. */
4480 lang_dependent_init (const char *name)
4482 if (dump_base_name == 0)
4483 dump_base_name = name ? name : "gccdump";
4485 /* Other front-end initialization. */
4486 if ((*lang_hooks.init) () == 0)
4489 init_asm_output (name);
4491 /* These create various _DECL nodes, so need to be called after the
4492 front end is initialized. */
4496 /* The following initialization functions need to generate rtl, so
4497 provide a dummy function context for them. */
4498 init_dummy_function_start ();
4500 expand_dummy_function_end ();
4502 /* If dbx symbol table desired, initialize writing it and output the
4503 predefined types. */
4504 timevar_push (TV_SYMOUT);
4506 #ifdef DWARF2_UNWIND_INFO
4507 if (dwarf2out_do_frame ())
4508 dwarf2out_frame_init ();
4511 /* Now we have the correct original filename, we can initialize
4513 (*debug_hooks->init) (name);
4515 timevar_pop (TV_SYMOUT);
4520 /* Clean up: close opened files, etc. */
4525 /* Close the dump files. */
4526 if (flag_gen_aux_info)
4528 fclose (aux_info_file);
4530 unlink (aux_info_file_name);
4533 /* Close non-debugging input and output files. Take special care to note
4534 whether fclose returns an error, since the pages might still be on the
4535 buffer chain while the file is open. */
4539 if (ferror (asm_out_file) != 0)
4540 fatal_error ("error writing to %s: %m", asm_file_name);
4541 if (fclose (asm_out_file) != 0)
4542 fatal_error ("error closing %s: %m", asm_file_name);
4545 /* Do whatever is necessary to finish printing the graphs. */
4546 if (graph_dump_format != no_graph)
4550 for (i = 0; i < (int) DFI_MAX; ++i)
4551 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4556 sprintf (seq, DUMPFILE_FORMAT, i);
4557 suffix = concat (seq, dump_file[i].extension, NULL);
4558 finish_graph_dump_file (dump_base_name, suffix);
4565 ggc_print_statistics ();
4566 stringpool_statistics ();
4567 dump_tree_statistics ();
4570 /* Free up memory for the benefit of leak detectors. */
4573 /* Language-specific end of compilation actions. */
4574 (*lang_hooks.finish) ();
4577 /* Initialize the compiler, and compile the input file. */
4581 /* Initialize timing first. The C front ends read the main file in
4582 the post_options hook, and C++ does file timings. */
4583 if (time_report || !quiet_flag || flag_detailed_statistics)
4585 timevar_start (TV_TOTAL);
4589 /* Don't do any more if an error has already occurred. */
4592 /* Set up the back-end if requested. */
4596 /* Language-dependent initialization. Returns true on success. */
4597 if (lang_dependent_init (main_input_filename))
4599 if (flag_unit_at_a_time)
4601 open_dump_file (DFI_cgraph, NULL);
4602 cgraph_dump_file = rtl_dump_file;
4603 rtl_dump_file = NULL;
4608 if (flag_unit_at_a_time)
4610 rtl_dump_file = cgraph_dump_file;
4611 cgraph_dump_file = NULL;
4612 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4619 /* Stop timing and print the times. */
4620 timevar_stop (TV_TOTAL);
4621 timevar_print (stderr);
4624 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4625 Decode command args, then call compile_file.
4626 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4627 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4629 It is not safe to call this function more than once. */
4632 toplev_main (unsigned int argc, const char **argv)
4636 /* Initialization of GCC's environment, and diagnostics. */
4637 general_init (argv[0]);
4639 /* Parse the options and do minimal processing; basically just
4640 enough to default flags appropriately. */
4641 decode_options (argc, argv);
4645 /* Exit early if we can (e.g. -help). */
4646 if (!exit_after_options)
4649 if (errorcount || sorrycount)
4650 return (FATAL_EXIT_CODE);
4652 return (SUCCESS_EXIT_CODE);