1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addressof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks = &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 /* Here is a table, controlled by the tm.h file, listing each -m switch
1183 and which bits in `target_switches' it should set or clear.
1184 If VALUE is positive, it is bits to set.
1185 If VALUE is negative, -VALUE is bits to clear.
1186 (The sign bit is not used so there is no confusion.) */
1190 const char *const name;
1192 const char *const description;
1194 target_switches[] = TARGET_SWITCHES;
1196 /* This table is similar, but allows the switch to have a value. */
1198 #ifdef TARGET_OPTIONS
1201 const char *const prefix;
1202 const char **const variable;
1203 const char *const description;
1204 const char *const value;
1206 target_options[] = TARGET_OPTIONS;
1209 /* Nonzero means warn about function definitions that default the return type
1210 or that use a null return and have a return-type other than void. */
1212 int warn_return_type;
1214 /* Output files for assembler code (real compiler output)
1215 and debugging dumps. */
1218 FILE *aux_info_file;
1219 FILE *rtl_dump_file = NULL;
1220 FILE *cgraph_dump_file = NULL;
1222 /* Set up a default flag_random_seed and local_tick, unless the user
1223 already specified one. */
1228 if (!flag_random_seed)
1230 unsigned HOST_WIDE_INT value;
1231 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1233 /* Get some more or less random data. */
1234 #ifdef HAVE_GETTIMEOFDAY
1238 gettimeofday (&tv, NULL);
1239 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1243 time_t now = time (NULL);
1245 if (now != (time_t)-1)
1246 local_tick = (unsigned) now;
1249 value = local_tick ^ getpid ();
1251 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1252 flag_random_seed = random_seed;
1254 else if (!local_tick)
1259 /* Decode the string P as an integral parameter.
1260 If the string is indeed an integer return its numeric value else
1261 issue an Invalid Option error for the option PNAME and return DEFVAL.
1262 If PNAME is zero just return DEFVAL, do not call error. */
1265 read_integral_parameter (const char *p, const char *pname, const int defval)
1267 const char *endp = p;
1271 if (ISDIGIT (*endp))
1280 error ("invalid option argument `%s'", pname);
1287 /* Return the logarithm of X, base 2, considering X unsigned,
1288 if X is a power of 2. Otherwise, returns -1.
1290 This should be used via the `exact_log2' macro. */
1293 exact_log2_wide (unsigned HOST_WIDE_INT x)
1296 /* Test for 0 or a power of 2. */
1297 if (x == 0 || x != (x & -x))
1299 while ((x >>= 1) != 0)
1304 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1305 If X is 0, return -1.
1307 This should be used via the floor_log2 macro. */
1310 floor_log2_wide (unsigned HOST_WIDE_INT x)
1319 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1320 into ICE messages, which is much more user friendly. In case the
1321 error printer crashes, reset the signal to prevent infinite recursion. */
1324 crash_signal (int signo)
1326 signal (signo, SIG_DFL);
1327 internal_error ("%s", strsignal (signo));
1330 /* Arrange to dump core on error. (The regular error message is still
1331 printed first, except in the case of abort().) */
1334 setup_core_dumping (void)
1337 signal (SIGABRT, SIG_DFL);
1339 #if defined(HAVE_SETRLIMIT)
1342 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1343 fatal_error ("getting core file size maximum limit: %m");
1344 rlim.rlim_cur = rlim.rlim_max;
1345 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1346 fatal_error ("setting core file size limit to maximum: %m");
1349 diagnostic_abort_on_error (global_dc);
1353 /* Strip off a legitimate source ending from the input string NAME of
1354 length LEN. Rather than having to know the names used by all of
1355 our front ends, we strip off an ending of a period followed by
1356 up to five characters. (Java uses ".class".) */
1359 strip_off_ending (char *name, int len)
1362 for (i = 2; i < 6 && len > i; i++)
1364 if (name[len - i] == '.')
1366 name[len - i] = '\0';
1372 /* Output a quoted string. */
1375 output_quoted_string (FILE *asm_file, const char *string)
1377 #ifdef OUTPUT_QUOTED_STRING
1378 OUTPUT_QUOTED_STRING (asm_file, string);
1382 putc ('\"', asm_file);
1383 while ((c = *string++) != 0)
1387 if (c == '\"' || c == '\\')
1388 putc ('\\', asm_file);
1392 fprintf (asm_file, "\\%03o", (unsigned char) c);
1394 putc ('\"', asm_file);
1398 /* Output a file name in the form wanted by System V. */
1401 output_file_directive (FILE *asm_file, const char *input_name)
1403 int len = strlen (input_name);
1404 const char *na = input_name + len;
1406 /* NA gets INPUT_NAME sans directory names. */
1407 while (na > input_name)
1409 if (IS_DIR_SEPARATOR (na[-1]))
1414 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1415 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1417 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1418 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1420 fprintf (asm_file, "\t.file\t");
1421 output_quoted_string (asm_file, na);
1422 fputc ('\n', asm_file);
1427 /* Routine to open a dump file. Return true if the dump file is enabled. */
1430 open_dump_file (enum dump_file_index index, tree decl)
1433 const char *open_arg;
1436 if (! dump_file[index].enabled)
1439 timevar_push (TV_DUMP);
1440 if (rtl_dump_file != NULL)
1441 fclose (rtl_dump_file);
1443 sprintf (seq, DUMPFILE_FORMAT, index);
1445 if (! dump_file[index].initialized)
1447 /* If we've not initialized the files, do so now. */
1448 if (graph_dump_format != no_graph
1449 && dump_file[index].graph_dump_p)
1451 dump_name = concat (seq, dump_file[index].extension, NULL);
1452 clean_graph_dump_file (dump_base_name, dump_name);
1455 dump_file[index].initialized = 1;
1461 dump_name = concat (dump_base_name, seq,
1462 dump_file[index].extension, NULL);
1464 rtl_dump_file = fopen (dump_name, open_arg);
1465 if (rtl_dump_file == NULL)
1466 fatal_error ("can't open %s: %m", dump_name);
1471 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1472 (*lang_hooks.decl_printable_name) (decl, 2),
1473 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1475 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1476 ? " (unlikely executed)"
1479 timevar_pop (TV_DUMP);
1483 /* Routine to close a dump file. */
1486 close_dump_file (enum dump_file_index index,
1487 void (*func) (FILE *, rtx),
1490 if (! rtl_dump_file)
1493 timevar_push (TV_DUMP);
1495 && graph_dump_format != no_graph
1496 && dump_file[index].graph_dump_p)
1501 sprintf (seq, DUMPFILE_FORMAT, index);
1502 suffix = concat (seq, dump_file[index].extension, NULL);
1503 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1508 func (rtl_dump_file, insns);
1510 fflush (rtl_dump_file);
1511 fclose (rtl_dump_file);
1513 rtl_dump_file = NULL;
1514 timevar_pop (TV_DUMP);
1517 /* Do any final processing required for the declarations in VEC, of
1518 which there are LEN. We write out inline functions and variables
1519 that have been deferred until this point, but which are required.
1520 Returns nonzero if anything was put out. */
1523 wrapup_global_declarations (tree *vec, int len)
1528 int output_something = 0;
1530 for (i = 0; i < len; i++)
1534 /* We're not deferring this any longer. Assignment is
1535 conditional to avoid needlessly dirtying PCH pages. */
1536 if (DECL_DEFER_OUTPUT (decl) != 0)
1537 DECL_DEFER_OUTPUT (decl) = 0;
1539 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1540 (*lang_hooks.finish_incomplete_decl) (decl);
1543 /* Now emit any global variables or functions that we have been
1544 putting off. We need to loop in case one of the things emitted
1545 here references another one which comes earlier in the list. */
1549 for (i = 0; i < len; i++)
1553 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1556 /* Don't write out static consts, unless we still need them.
1558 We also keep static consts if not optimizing (for debugging),
1559 unless the user specified -fno-keep-static-consts.
1560 ??? They might be better written into the debug information.
1561 This is possible when using DWARF.
1563 A language processor that wants static constants to be always
1564 written out (even if it is not used) is responsible for
1565 calling rest_of_decl_compilation itself. E.g. the C front-end
1566 calls rest_of_decl_compilation from finish_decl.
1567 One motivation for this is that is conventional in some
1568 environments to write things like:
1569 static const char rcsid[] = "... version string ...";
1570 intending to force the string to be in the executable.
1572 A language processor that would prefer to have unneeded
1573 static constants "optimized away" would just defer writing
1574 them out until here. E.g. C++ does this, because static
1575 constants are often defined in header files.
1577 ??? A tempting alternative (for both C and C++) would be
1578 to force a constant to be written if and only if it is
1579 defined in a main file, as opposed to an include file. */
1581 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1585 if (flag_unit_at_a_time
1586 && cgraph_varpool_node (decl)->finalized)
1588 else if (flag_unit_at_a_time
1589 && (TREE_USED (decl)
1590 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1592 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1594 else if (DECL_COMDAT (decl))
1596 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1597 && (optimize || !flag_keep_static_consts
1598 || DECL_ARTIFICIAL (decl)))
1604 rest_of_decl_compilation (decl, NULL, 1, 1);
1608 if (TREE_CODE (decl) == FUNCTION_DECL
1609 && DECL_INITIAL (decl) != 0
1610 && DECL_SAVED_INSNS (decl) != 0
1611 && (flag_keep_inline_functions
1612 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1613 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1616 output_inline_function (decl);
1621 output_something = 1;
1625 return output_something;
1628 /* Issue appropriate warnings for the global declarations in VEC (of
1629 which there are LEN). Output debugging information for them. */
1632 check_global_declarations (tree *vec, int len)
1637 for (i = 0; i < len; i++)
1641 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1642 && ! TREE_ASM_WRITTEN (decl))
1643 /* Cancel the RTL for this decl so that, if debugging info
1644 output for global variables is still to come,
1645 this one will be omitted. */
1646 SET_DECL_RTL (decl, NULL_RTX);
1648 /* Warn about any function
1649 declared static but not defined.
1650 We don't warn about variables,
1651 because many programs have static variables
1652 that exist only to get some text into the object file. */
1653 if (TREE_CODE (decl) == FUNCTION_DECL
1654 && (warn_unused_function
1655 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1656 && DECL_INITIAL (decl) == 0
1657 && DECL_EXTERNAL (decl)
1658 && ! DECL_ARTIFICIAL (decl)
1659 && ! TREE_PUBLIC (decl))
1661 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1662 pedwarn_with_decl (decl,
1663 "`%s' used but never defined");
1665 warning_with_decl (decl,
1666 "`%s' declared `static' but never defined");
1667 /* This symbol is effectively an "extern" declaration now. */
1668 TREE_PUBLIC (decl) = 1;
1669 assemble_external (decl);
1672 /* Warn about static fns or vars defined but not used. */
1673 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1674 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1675 && ! TREE_USED (decl)
1676 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1677 to handle multiple external decls in different scopes. */
1678 && ! TREE_USED (DECL_NAME (decl))
1679 && ! DECL_EXTERNAL (decl)
1680 && ! TREE_PUBLIC (decl)
1681 /* A volatile variable might be used in some non-obvious way. */
1682 && ! TREE_THIS_VOLATILE (decl)
1683 /* Global register variables must be declared to reserve them. */
1684 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1685 /* Otherwise, ask the language. */
1686 && (*lang_hooks.decls.warn_unused_global) (decl))
1687 warning_with_decl (decl, "`%s' defined but not used");
1689 /* Avoid confusing the debug information machinery when there are
1691 if (errorcount == 0 && sorrycount == 0)
1693 timevar_push (TV_SYMOUT);
1694 (*debug_hooks->global_decl) (decl);
1695 timevar_pop (TV_SYMOUT);
1700 /* Save the current INPUT_LOCATION on the top entry in the
1701 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1702 INPUT_LOCATION accordingly. */
1705 push_srcloc (const char *file, int line)
1707 struct file_stack *fs;
1709 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
1710 fs->location = input_location;
1711 fs->next = input_file_stack;
1712 input_filename = file;
1714 input_file_stack = fs;
1715 input_file_stack_tick++;
1718 /* Pop the top entry off the stack of presently open source files.
1719 Restore the INPUT_LOCATION from the new topmost entry on the
1725 struct file_stack *fs;
1727 fs = input_file_stack;
1728 input_location = fs->location;
1729 input_file_stack = fs->next;
1731 input_file_stack_tick++;
1734 /* Compile an entire translation unit. Write a file of assembly
1735 output and various debugging dumps. */
1740 /* Initialize yet another pass. */
1742 init_final (main_input_filename);
1743 coverage_init (aux_base_name);
1745 timevar_push (TV_PARSE);
1747 /* Call the parser, which parses the entire file (calling
1748 rest_of_compilation for each function). */
1749 (*lang_hooks.parse_file) (set_yydebug);
1751 /* In case there were missing block closers,
1752 get us back to the global binding level. */
1753 (*lang_hooks.clear_binding_stack) ();
1755 /* Compilation is now finished except for writing
1756 what's left of the symbol table output. */
1757 timevar_pop (TV_PARSE);
1759 if (flag_syntax_only)
1762 (*lang_hooks.decls.final_write_globals)();
1764 cgraph_varpool_assemble_pending_decls ();
1766 /* This must occur after the loop to output deferred functions.
1767 Else the coverage initializer would not be emitted if all the
1768 functions in this compilation unit were deferred. */
1771 /* Write out any pending weak symbol declarations. */
1775 /* Do dbx symbols. */
1776 timevar_push (TV_SYMOUT);
1778 #ifdef DWARF2_UNWIND_INFO
1779 if (dwarf2out_do_frame ())
1780 dwarf2out_frame_finish ();
1783 (*debug_hooks->finish) (main_input_filename);
1784 timevar_pop (TV_SYMOUT);
1786 /* Output some stuff at end of file if nec. */
1788 dw2_output_indirect_constants ();
1790 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1792 timevar_push (TV_DUMP);
1793 open_dump_file (DFI_bp, NULL);
1797 close_dump_file (DFI_bp, NULL, NULL_RTX);
1798 timevar_pop (TV_DUMP);
1801 targetm.asm_out.file_end ();
1803 /* Attach a special .ident directive to the end of the file to identify
1804 the version of GCC which compiled this code. The format of the .ident
1805 string is patterned after the ones produced by native SVR4 compilers. */
1808 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1809 IDENT_ASM_OP, version_string);
1812 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1814 timevar_push (TV_DUMP);
1815 dump_combine_total_stats (rtl_dump_file);
1816 close_dump_file (DFI_combine, NULL, NULL_RTX);
1817 timevar_pop (TV_DUMP);
1821 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1822 and TYPE_DECL nodes.
1824 This does nothing for local (non-static) variables, unless the
1825 variable is a register variable with an ASMSPEC. In that case, or
1826 if the variable is not an automatic, it sets up the RTL and
1827 outputs any assembler code (label definition, storage allocation
1828 and initialization).
1830 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1831 the assembler symbol name to be used. TOP_LEVEL is nonzero
1832 if this declaration is not within a function. */
1835 rest_of_decl_compilation (tree decl,
1836 const char *asmspec,
1840 /* We deferred calling assemble_alias so that we could collect
1841 other attributes such as visibility. Emit the alias now. */
1844 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1847 alias = TREE_VALUE (TREE_VALUE (alias));
1848 alias = get_identifier (TREE_STRING_POINTER (alias));
1849 assemble_alias (decl, alias);
1853 /* Forward declarations for nested functions are not "external",
1854 but we need to treat them as if they were. */
1855 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1856 || TREE_CODE (decl) == FUNCTION_DECL)
1858 timevar_push (TV_VARCONST);
1861 make_decl_rtl (decl, asmspec);
1863 /* Don't output anything when a tentative file-scope definition
1864 is seen. But at end of compilation, do output code for them. */
1865 if (at_end || !DECL_DEFER_OUTPUT (decl))
1867 if (flag_unit_at_a_time && !cgraph_global_info_ready
1868 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1869 cgraph_varpool_finalize_decl (decl);
1871 assemble_variable (decl, top_level, at_end, 0);
1874 #ifdef ASM_FINISH_DECLARE_OBJECT
1875 if (decl == last_assemble_variable_decl)
1877 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1882 timevar_pop (TV_VARCONST);
1884 else if (DECL_REGISTER (decl) && asmspec != 0)
1886 if (decode_reg_name (asmspec) >= 0)
1888 SET_DECL_RTL (decl, NULL_RTX);
1889 make_decl_rtl (decl, asmspec);
1893 error ("invalid register name `%s' for register variable", asmspec);
1894 DECL_REGISTER (decl) = 0;
1899 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1900 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1901 && TREE_CODE (decl) == TYPE_DECL)
1903 timevar_push (TV_SYMOUT);
1904 dbxout_symbol (decl, 0);
1905 timevar_pop (TV_SYMOUT);
1908 #ifdef SDB_DEBUGGING_INFO
1909 else if (write_symbols == SDB_DEBUG && top_level
1910 && TREE_CODE (decl) == TYPE_DECL)
1912 timevar_push (TV_SYMOUT);
1913 sdbout_symbol (decl, 0);
1914 timevar_pop (TV_SYMOUT);
1917 #ifdef DWARF2_DEBUGGING_INFO
1918 else if ((write_symbols == DWARF2_DEBUG
1919 || write_symbols == VMS_AND_DWARF2_DEBUG)
1921 && TREE_CODE (decl) == TYPE_DECL)
1923 timevar_push (TV_SYMOUT);
1924 dwarf2out_decl (decl);
1925 timevar_pop (TV_SYMOUT);
1930 /* Called after finishing a record, union or enumeral type. */
1933 rest_of_type_compilation (
1934 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1935 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1939 tree type ATTRIBUTE_UNUSED,
1940 int toplev ATTRIBUTE_UNUSED
1944 /* Avoid confusing the debug information machinery when there are
1946 if (errorcount != 0 || sorrycount != 0)
1949 timevar_push (TV_SYMOUT);
1950 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1951 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1952 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
1954 #ifdef SDB_DEBUGGING_INFO
1955 if (write_symbols == SDB_DEBUG)
1956 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
1958 #ifdef DWARF2_DEBUGGING_INFO
1959 if ((write_symbols == DWARF2_DEBUG
1960 || write_symbols == VMS_AND_DWARF2_DEBUG)
1962 dwarf2out_decl (TYPE_STUB_DECL (type));
1964 timevar_pop (TV_SYMOUT);
1967 /* Turn the RTL into assembly. */
1969 rest_of_handle_final (tree decl, rtx insns)
1971 timevar_push (TV_FINAL);
1976 /* Get the function's name, as described by its RTL. This may be
1977 different from the DECL_NAME name used in the source file. */
1979 x = DECL_RTL (decl);
1980 if (GET_CODE (x) != MEM)
1983 if (GET_CODE (x) != SYMBOL_REF)
1985 fnname = XSTR (x, 0);
1987 assemble_start_function (decl, fnname);
1988 final_start_function (insns, asm_out_file, optimize);
1989 final (insns, asm_out_file, optimize, 0);
1990 final_end_function ();
1992 #ifdef IA64_UNWIND_INFO
1993 /* ??? The IA-64 ".handlerdata" directive must be issued before
1994 the ".endp" directive that closes the procedure descriptor. */
1995 output_function_exception_table ();
1998 assemble_end_function (decl, fnname);
2000 #ifndef IA64_UNWIND_INFO
2001 /* Otherwise, it feels unclean to switch sections in the middle. */
2002 output_function_exception_table ();
2006 fflush (asm_out_file);
2008 /* Release all memory allocated by flow. */
2009 free_basic_block_vars (0);
2011 /* Release all memory held by regsets now. */
2012 regset_release_memory ();
2014 timevar_pop (TV_FINAL);
2020 /* Run delay slot optimization. */
2022 rest_of_handle_delay_slots (tree decl, rtx insns)
2024 timevar_push (TV_DBR_SCHED);
2025 open_dump_file (DFI_dbr, decl);
2027 dbr_schedule (insns, rtl_dump_file);
2029 close_dump_file (DFI_dbr, print_rtl, insns);
2030 timevar_pop (TV_DBR_SCHED);
2037 /* Convert register usage from flat register file usage to a stack
2040 rest_of_handle_stack_regs (tree decl, rtx insns)
2042 timevar_push (TV_REG_STACK);
2043 open_dump_file (DFI_stack, decl);
2045 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2047 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2048 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2049 && flag_reorder_blocks)
2051 reorder_basic_blocks ();
2052 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2056 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2057 timevar_pop (TV_REG_STACK);
2064 /* Machine independent reorg pass. */
2066 rest_of_handle_machine_reorg (tree decl, rtx insns)
2068 timevar_push (TV_MACH_DEP);
2069 open_dump_file (DFI_mach, decl);
2071 (*targetm.machine_dependent_reorg) ();
2073 close_dump_file (DFI_mach, print_rtl, insns);
2074 timevar_pop (TV_MACH_DEP);
2080 /* Run new register allocator. Return TRUE if we must exit
2081 rest_of_compilation upon return. */
2083 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2087 delete_trivially_dead_insns (insns, max_reg_num ());
2090 timevar_pop (TV_LOCAL_ALLOC);
2091 if (dump_file[DFI_lreg].enabled)
2093 timevar_push (TV_DUMP);
2095 close_dump_file (DFI_lreg, NULL, NULL);
2096 timevar_pop (TV_DUMP);
2099 /* XXX clean up the whole mess to bring live info in shape again. */
2100 timevar_push (TV_GLOBAL_ALLOC);
2101 open_dump_file (DFI_greg, decl);
2103 build_insn_chain (insns);
2104 failure = reload (insns, 0);
2106 timevar_pop (TV_GLOBAL_ALLOC);
2108 if (dump_file[DFI_greg].enabled)
2110 timevar_push (TV_DUMP);
2112 dump_global_regs (rtl_dump_file);
2114 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2115 timevar_pop (TV_DUMP);
2121 reload_completed = 1;
2127 /* Run old register allocator. Return TRUE if we must exit
2128 rest_of_compilation upon return. */
2130 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2134 /* Allocate the reg_renumber array. */
2135 allocate_reg_info (max_regno, FALSE, TRUE);
2137 /* And the reg_equiv_memory_loc array. */
2138 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
2140 allocate_initial_values (reg_equiv_memory_loc);
2142 regclass (insns, max_reg_num (), rtl_dump_file);
2143 *rebuild_notes = local_alloc ();
2145 timevar_pop (TV_LOCAL_ALLOC);
2147 if (dump_file[DFI_lreg].enabled)
2149 timevar_push (TV_DUMP);
2151 dump_flow_info (rtl_dump_file);
2152 dump_local_alloc (rtl_dump_file);
2154 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2155 timevar_pop (TV_DUMP);
2160 timevar_push (TV_GLOBAL_ALLOC);
2161 open_dump_file (DFI_greg, decl);
2163 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2164 pass fixing up any insns that are invalid. */
2167 failure = global_alloc (rtl_dump_file);
2170 build_insn_chain (insns);
2171 failure = reload (insns, 0);
2174 timevar_pop (TV_GLOBAL_ALLOC);
2176 if (dump_file[DFI_greg].enabled)
2178 timevar_push (TV_DUMP);
2180 dump_global_regs (rtl_dump_file);
2182 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2183 timevar_pop (TV_DUMP);
2189 /* Run the regrename and cprop passes. */
2191 rest_of_handle_regrename (tree decl, rtx insns)
2193 timevar_push (TV_RENAME_REGISTERS);
2194 open_dump_file (DFI_rnreg, decl);
2196 if (flag_rename_registers)
2197 regrename_optimize ();
2198 if (flag_cprop_registers)
2199 copyprop_hardreg_forward ();
2201 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2202 timevar_pop (TV_RENAME_REGISTERS);
2205 /* Reorder basic blocks. */
2207 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2209 timevar_push (TV_REORDER_BLOCKS);
2210 open_dump_file (DFI_bbro, decl);
2212 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2213 splitting possibly introduced more crossjumping opportunities. */
2214 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2215 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2217 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2219 if (flag_reorder_blocks)
2220 reorder_basic_blocks ();
2221 if (flag_reorder_blocks
2222 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2223 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2225 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2226 timevar_pop (TV_REORDER_BLOCKS);
2229 #ifdef INSN_SCHEDULING
2230 /* Run instruction scheduler. */
2232 rest_of_handle_sched (tree decl, rtx insns)
2234 timevar_push (TV_SCHED);
2236 /* Print function header into sched dump now
2237 because doing the sched analysis makes some of the dump. */
2238 if (optimize > 0 && flag_schedule_insns)
2240 open_dump_file (DFI_sched, decl);
2242 /* Do control and data sched analysis,
2243 and write some of the results to dump file. */
2245 schedule_insns (rtl_dump_file);
2247 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2249 timevar_pop (TV_SCHED);
2254 /* Run second scheduling pass after reload. */
2256 rest_of_handle_sched2 (tree decl, rtx insns)
2258 timevar_push (TV_SCHED2);
2259 open_dump_file (DFI_sched2, decl);
2261 /* Do control and data sched analysis again,
2262 and write some more of the results to dump file. */
2264 split_all_insns (1);
2266 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2268 schedule_ebbs (rtl_dump_file);
2269 /* No liveness updating code yet, but it should be easy to do.
2270 reg-stack recompute the liveness when needed for now. */
2271 count_or_remove_death_notes (NULL, 1);
2272 cleanup_cfg (CLEANUP_EXPENSIVE);
2275 schedule_insns (rtl_dump_file);
2277 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2278 timevar_pop (TV_SCHED2);
2284 /* Register allocation pre-pass, to reduce number of moves necessary
2285 for two-address machines. */
2287 rest_of_handle_regmove (tree decl, rtx insns)
2289 timevar_push (TV_REGMOVE);
2290 open_dump_file (DFI_regmove, decl);
2292 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2294 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2295 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2296 timevar_pop (TV_REGMOVE);
2303 rest_of_handle_tracer (tree decl, rtx insns)
2305 timevar_push (TV_TRACER);
2306 open_dump_file (DFI_tracer, decl);
2308 dump_flow_info (rtl_dump_file);
2310 cleanup_cfg (CLEANUP_EXPENSIVE);
2311 reg_scan (insns, max_reg_num (), 0);
2312 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2313 timevar_pop (TV_TRACER);
2316 /* If-conversion and CFG cleanup. */
2318 rest_of_handle_if_conversion (tree decl, rtx insns)
2320 open_dump_file (DFI_ce1, decl);
2321 if (flag_if_conversion)
2323 timevar_push (TV_IFCVT);
2325 dump_flow_info (rtl_dump_file);
2326 cleanup_cfg (CLEANUP_EXPENSIVE);
2327 reg_scan (insns, max_reg_num (), 0);
2329 timevar_pop (TV_IFCVT);
2331 timevar_push (TV_JUMP);
2332 cleanup_cfg (CLEANUP_EXPENSIVE);
2333 reg_scan (insns, max_reg_num (), 0);
2334 timevar_pop (TV_JUMP);
2335 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2338 /* Rerun if-conversion, as combine may have simplified things enough
2339 to now meet sequence length restrictions. */
2341 rest_of_handle_if_after_combine (tree decl, rtx insns)
2343 timevar_push (TV_IFCVT);
2344 open_dump_file (DFI_ce2, decl);
2350 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2351 timevar_pop (TV_IFCVT);
2354 /* Do branch profiling and static profile estimation passes. */
2356 rest_of_handle_branch_prob (tree decl, rtx insns)
2360 timevar_push (TV_BRANCH_PROB);
2361 open_dump_file (DFI_bp, decl);
2362 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2365 /* Discover and record the loop depth at the head of each basic
2366 block. The loop infrastructure does the real job for us. */
2367 flow_loops_find (&loops, LOOP_TREE);
2370 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2372 /* Estimate using heuristics if no profiling info is available. */
2373 if (flag_guess_branch_prob)
2374 estimate_probability (&loops);
2376 flow_loops_free (&loops);
2377 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2378 timevar_pop (TV_BRANCH_PROB);
2381 /* Do control and data flow analysis; write some of the results to the
2384 rest_of_handle_cfg (tree decl, rtx insns)
2386 open_dump_file (DFI_cfg, decl);
2388 dump_flow_info (rtl_dump_file);
2390 cleanup_cfg (CLEANUP_EXPENSIVE
2391 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2393 /* It may make more sense to mark constant functions after dead code is
2394 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2395 may insert code making function non-constant, but we still must consider
2396 it as constant, otherwise -fbranch-probabilities will not read data back.
2398 life_analysis rarely eliminates modification of external memory.
2401 mark_constant_function ();
2403 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2406 /* Purge addressofs. */
2408 rest_of_handle_addressof (tree decl, rtx insns)
2410 open_dump_file (DFI_addressof, decl);
2412 purge_addressof (insns);
2413 if (optimize && purge_all_dead_edges (0))
2414 delete_unreachable_blocks ();
2415 reg_scan (insns, max_reg_num (), 1);
2417 close_dump_file (DFI_addressof, print_rtl, insns);
2420 /* We may have potential sibling or tail recursion sites. Select one
2421 (of possibly multiple) methods of performing the call. */
2423 rest_of_handle_sibling_calls (rtx insns)
2426 optimize_sibling_and_tail_recursive_calls ();
2428 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2429 free_bb_for_insn ();
2430 find_exception_handler_labels ();
2431 rebuild_jump_labels (insns);
2432 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2434 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2435 notes before simplifying cfg and we must do lowering after sibcall
2436 that unhides parts of RTL chain and cleans up the CFG.
2438 Until sibcall is replaced by tree-level optimizer, lets just
2439 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2440 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2441 if (GET_CODE (insn) == NOTE
2442 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2445 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2448 /* Perform jump bypassing and control flow optimizations. */
2450 rest_of_handle_jump_bypass (tree decl, rtx insns)
2452 timevar_push (TV_BYPASS);
2453 open_dump_file (DFI_bypass, decl);
2455 cleanup_cfg (CLEANUP_EXPENSIVE);
2457 if (bypass_jumps (rtl_dump_file))
2459 rebuild_jump_labels (insns);
2460 cleanup_cfg (CLEANUP_EXPENSIVE);
2461 delete_trivially_dead_insns (insns, max_reg_num ());
2464 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2465 timevar_pop (TV_BYPASS);
2469 #ifdef ENABLE_CHECKING
2470 verify_flow_info ();
2474 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2475 if we must exit rest_of_compilation upon return. */
2477 rest_of_handle_inlining (tree decl)
2484 /* If we are reconsidering an inline function at the end of
2485 compilation, skip the stuff for making it inline. */
2486 if (DECL_SAVED_INSNS (decl) != 0)
2489 /* If this is nested inside an inlined external function, pretend
2490 it was only declared. Since we cannot inline such functions,
2491 generating code for this one is not only not necessary but will
2492 confuse some debugging output writers. */
2493 for (parent = DECL_CONTEXT (current_function_decl);
2494 parent != NULL_TREE;
2495 parent = get_containing_scope (parent))
2496 if (TREE_CODE (parent) == FUNCTION_DECL
2497 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2499 DECL_INITIAL (decl) = 0;
2502 else if (TYPE_P (parent))
2503 /* A function in a local class should be treated normally. */
2506 /* If requested, consider whether to make this function inline. */
2507 if ((DECL_INLINE (decl) && !flag_no_inline)
2508 || flag_inline_functions)
2510 timevar_push (TV_INTEGRATION);
2511 lose = function_cannot_inline_p (decl);
2512 timevar_pop (TV_INTEGRATION);
2513 if (lose || ! optimize)
2515 if (warn_inline && DECL_INLINE (decl))
2516 warning_with_decl (decl, lose);
2517 DECL_ABSTRACT_ORIGIN (decl) = 0;
2518 /* Don't really compile an extern inline function.
2519 If we can't make it inline, pretend
2520 it was only declared. */
2521 if (DECL_EXTERNAL (decl))
2523 DECL_INITIAL (decl) = 0;
2528 /* ??? Note that we used to just make it look like if
2529 the "inline" keyword was specified when we decide
2530 to inline it (because of -finline-functions).
2531 garloff@suse.de, 2002-04-24: Add another flag to
2532 actually record this piece of information. */
2533 if (!DECL_INLINE (decl))
2534 DID_INLINE_FUNC (decl) = 1;
2535 inlinable = DECL_INLINE (decl) = 1;
2539 insns = get_insns ();
2541 /* Dump the rtl code if we are dumping rtl. */
2543 if (open_dump_file (DFI_rtl, decl))
2545 if (DECL_SAVED_INSNS (decl))
2546 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2547 close_dump_file (DFI_rtl, print_rtl, insns);
2550 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2551 sorts of eh initialization. Delay this until after the
2552 initial rtl dump so that we can see the original nesting. */
2553 convert_from_eh_region_ranges ();
2555 /* If function is inline, and we don't yet know whether to
2556 compile it by itself, defer decision till end of compilation.
2557 wrapup_global_declarations will (indirectly) call
2558 rest_of_compilation again for those functions that need to
2559 be output. Also defer those functions that we are supposed
2563 || (DECL_INLINE (decl)
2564 && flag_inline_functions
2565 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2566 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2567 && ! flag_keep_inline_functions)
2568 || DECL_EXTERNAL (decl))))
2569 DECL_DEFER_OUTPUT (decl) = 1;
2571 if (DECL_INLINE (decl))
2572 /* DWARF wants separate debugging info for abstract and
2573 concrete instances of all inline functions, including those
2574 declared inline but not inlined, and those inlined even
2575 though they weren't declared inline. Conveniently, that's
2576 what DECL_INLINE means at this point. */
2577 (*debug_hooks->deferred_inline_function) (decl);
2579 if (DECL_DEFER_OUTPUT (decl))
2581 /* If -Wreturn-type, we have to do a bit of compilation. We just
2582 want to call cleanup the cfg to figure out whether or not we can
2583 fall off the end of the function; we do the minimum amount of
2584 work necessary to make that safe. */
2585 if (warn_return_type)
2587 int saved_optimize = optimize;
2590 rebuild_jump_labels (insns);
2591 find_exception_handler_labels ();
2592 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2593 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2594 optimize = saved_optimize;
2596 /* CFG is no longer maintained up-to-date. */
2597 free_bb_for_insn ();
2600 set_nothrow_function_flags ();
2601 if (current_function_nothrow)
2602 /* Now we know that this can't throw; set the flag for the benefit
2603 of other functions later in this translation unit. */
2604 TREE_NOTHROW (current_function_decl) = 1;
2606 timevar_push (TV_INTEGRATION);
2607 save_for_inline (decl);
2608 timevar_pop (TV_INTEGRATION);
2609 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2613 /* If specified extern inline but we aren't inlining it, we are
2614 done. This goes for anything that gets here with DECL_EXTERNAL
2615 set, not just things with DECL_INLINE. */
2616 return (bool) DECL_EXTERNAL (decl);
2619 /* Rest of compilation helper to convert the rtl to SSA form. */
2621 rest_of_handle_ssa (tree decl, rtx insns)
2623 timevar_push (TV_TO_SSA);
2624 open_dump_file (DFI_ssa, decl);
2626 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2629 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2630 timevar_pop (TV_TO_SSA);
2632 /* Perform sparse conditional constant propagation, if requested. */
2635 timevar_push (TV_SSA_CCP);
2636 open_dump_file (DFI_ssa_ccp, decl);
2640 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2641 timevar_pop (TV_SSA_CCP);
2644 /* It would be useful to cleanup the CFG at this point, but block
2645 merging and possibly other transformations might leave a PHI
2646 node in the middle of a basic block, which is a strict no-no. */
2648 /* The SSA implementation uses basic block numbers in its phi
2649 nodes. Thus, changing the control-flow graph or the basic
2650 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2651 may cause problems. */
2655 /* Remove dead code. */
2657 timevar_push (TV_SSA_DCE);
2658 open_dump_file (DFI_ssa_dce, decl);
2660 insns = get_insns ();
2661 ssa_eliminate_dead_code ();
2663 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2664 timevar_pop (TV_SSA_DCE);
2667 /* Convert from SSA form. */
2669 timevar_push (TV_FROM_SSA);
2670 open_dump_file (DFI_ussa, decl);
2672 convert_from_ssa ();
2673 /* New registers have been created. Rescan their usage. */
2674 reg_scan (insns, max_reg_num (), 1);
2676 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2677 timevar_pop (TV_FROM_SSA);
2684 /* Try to identify useless null pointer tests and delete them. */
2686 rest_of_handle_null_pointer (tree decl, rtx insns)
2688 open_dump_file (DFI_null, decl);
2690 dump_flow_info (rtl_dump_file);
2692 if (delete_null_pointer_checks (insns))
2693 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2695 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2698 /* Try combining insns through substitution. */
2700 rest_of_handle_combine (tree decl, rtx insns)
2702 int rebuild_jump_labels_after_combine = 0;
2704 timevar_push (TV_COMBINE);
2705 open_dump_file (DFI_combine, decl);
2707 rebuild_jump_labels_after_combine
2708 = combine_instructions (insns, max_reg_num ());
2710 /* Combining insns may have turned an indirect jump into a
2711 direct jump. Rebuild the JUMP_LABEL fields of jumping
2713 if (rebuild_jump_labels_after_combine)
2715 timevar_push (TV_JUMP);
2716 rebuild_jump_labels (insns);
2717 timevar_pop (TV_JUMP);
2719 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2722 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2723 timevar_pop (TV_COMBINE);
2728 /* Perform life analysis. */
2730 rest_of_handle_life (tree decl, rtx insns)
2732 open_dump_file (DFI_life, decl);
2735 #ifdef ENABLE_CHECKING
2736 verify_flow_info ();
2738 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2740 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2741 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2742 timevar_pop (TV_FLOW);
2744 if (warn_uninitialized)
2746 uninitialized_vars_warning (DECL_INITIAL (decl));
2748 setjmp_args_warning ();
2753 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2755 /* Insns were inserted, and possibly pseudos created, so
2756 things might look a bit different. */
2757 insns = get_insns ();
2758 allocate_reg_life_data ();
2759 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2760 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2766 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2771 /* Perform common subexpression elimination. Nonzero value from
2772 `cse_main' means that jumps were simplified and some code may now
2773 be unreachable, so do jump optimization again. */
2775 rest_of_handle_cse (tree decl, rtx insns)
2779 open_dump_file (DFI_cse, decl);
2781 dump_flow_info (rtl_dump_file);
2782 timevar_push (TV_CSE);
2784 reg_scan (insns, max_reg_num (), 1);
2786 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2788 rebuild_jump_labels (insns);
2789 purge_all_dead_edges (0);
2791 delete_trivially_dead_insns (insns, max_reg_num ());
2793 /* If we are not running more CSE passes, then we are no longer
2794 expecting CSE to be run. But always rerun it in a cheap mode. */
2795 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2797 if (tem || optimize > 1)
2798 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2799 /* Try to identify useless null pointer tests and delete them. */
2800 if (flag_delete_null_pointer_checks)
2802 timevar_push (TV_JUMP);
2804 if (delete_null_pointer_checks (insns))
2805 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2806 timevar_pop (TV_JUMP);
2809 /* The second pass of jump optimization is likely to have
2810 removed a bunch more instructions. */
2811 renumber_insns (rtl_dump_file);
2813 timevar_pop (TV_CSE);
2814 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2817 /* Run second CSE pass after loop optimizations. */
2819 rest_of_handle_cse2 (tree decl, rtx insns)
2823 timevar_push (TV_CSE2);
2824 open_dump_file (DFI_cse2, decl);
2826 dump_flow_info (rtl_dump_file);
2827 /* CFG is no longer maintained up-to-date. */
2828 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2829 purge_all_dead_edges (0);
2830 delete_trivially_dead_insns (insns, max_reg_num ());
2834 timevar_push (TV_JUMP);
2835 rebuild_jump_labels (insns);
2836 cleanup_cfg (CLEANUP_EXPENSIVE);
2837 timevar_pop (TV_JUMP);
2839 reg_scan (insns, max_reg_num (), 0);
2840 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2842 timevar_pop (TV_CSE2);
2845 /* Perform global cse. */
2847 rest_of_handle_gcse (tree decl, rtx insns)
2849 int save_csb, save_cfj;
2852 timevar_push (TV_GCSE);
2853 open_dump_file (DFI_gcse, decl);
2855 tem = gcse_main (insns, rtl_dump_file);
2856 rebuild_jump_labels (insns);
2857 delete_trivially_dead_insns (insns, max_reg_num ());
2859 save_csb = flag_cse_skip_blocks;
2860 save_cfj = flag_cse_follow_jumps;
2861 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2863 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2864 if (current_function_calls_constant_p)
2865 purge_builtin_constant_p ();
2867 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2869 if (flag_expensive_optimizations)
2871 timevar_push (TV_CSE);
2872 reg_scan (insns, max_reg_num (), 1);
2873 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2874 purge_all_dead_edges (0);
2875 delete_trivially_dead_insns (insns, max_reg_num ());
2876 timevar_pop (TV_CSE);
2877 cse_not_expected = !flag_rerun_cse_after_loop;
2880 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2881 things up. Then possibly re-run CSE again. */
2885 timevar_push (TV_JUMP);
2886 rebuild_jump_labels (insns);
2887 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2888 timevar_pop (TV_JUMP);
2890 if (flag_expensive_optimizations)
2892 timevar_push (TV_CSE);
2893 reg_scan (insns, max_reg_num (), 1);
2894 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2895 purge_all_dead_edges (0);
2896 delete_trivially_dead_insns (insns, max_reg_num ());
2897 timevar_pop (TV_CSE);
2901 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2902 timevar_pop (TV_GCSE);
2905 flag_cse_skip_blocks = save_csb;
2906 flag_cse_follow_jumps = save_cfj;
2907 #ifdef ENABLE_CHECKING
2908 verify_flow_info ();
2912 /* Move constant computations out of loops. */
2914 rest_of_handle_loop_optimize (tree decl, rtx insns)
2916 int do_unroll, do_prefetch;
2918 timevar_push (TV_LOOP);
2919 delete_dead_jumptables ();
2920 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2921 open_dump_file (DFI_loop, decl);
2923 /* CFG is no longer maintained up-to-date. */
2924 free_bb_for_insn ();
2926 if (flag_unroll_loops)
2927 do_unroll = 0; /* Having two unrollers is useless. */
2929 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2930 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2932 if (flag_rerun_loop_opt)
2934 cleanup_barriers ();
2936 /* We only want to perform unrolling once. */
2937 loop_optimize (insns, rtl_dump_file, do_unroll);
2940 /* The first call to loop_optimize makes some instructions
2941 trivially dead. We delete those instructions now in the
2942 hope that doing so will make the heuristics in loop work
2943 better and possibly speed up compilation. */
2944 delete_trivially_dead_insns (insns, max_reg_num ());
2946 /* The regscan pass is currently necessary as the alias
2947 analysis code depends on this information. */
2948 reg_scan (insns, max_reg_num (), 1);
2950 cleanup_barriers ();
2951 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2953 /* Loop can create trivially dead instructions. */
2954 delete_trivially_dead_insns (insns, max_reg_num ());
2955 close_dump_file (DFI_loop, print_rtl, insns);
2956 timevar_pop (TV_LOOP);
2957 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2962 /* Perform loop optimizations. It might be better to do them a bit
2963 sooner, but we want the profile feedback to work more
2966 rest_of_handle_loop2 (tree decl, rtx insns)
2968 struct loops *loops;
2969 timevar_push (TV_LOOP);
2970 open_dump_file (DFI_loop2, decl);
2972 dump_flow_info (rtl_dump_file);
2974 loops = loop_optimizer_init (rtl_dump_file);
2978 /* The optimizations: */
2979 if (flag_unswitch_loops)
2980 unswitch_loops (loops);
2982 if (flag_peel_loops || flag_unroll_loops)
2983 unroll_and_peel_loops (loops,
2984 (flag_peel_loops ? UAP_PEEL : 0) |
2985 (flag_unroll_loops ? UAP_UNROLL : 0) |
2986 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
2988 loop_optimizer_finalize (loops, rtl_dump_file);
2991 cleanup_cfg (CLEANUP_EXPENSIVE);
2992 delete_trivially_dead_insns (insns, max_reg_num ());
2993 reg_scan (insns, max_reg_num (), 0);
2995 dump_flow_info (rtl_dump_file);
2996 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
2997 timevar_pop (TV_LOOP);
3001 /* This is called from finish_function (within langhooks.parse_file)
3002 after each top-level definition is parsed.
3003 It is supposed to compile that function or variable
3004 and output the assembler code for it.
3005 After we return, the tree storage is freed. */
3008 rest_of_compilation (tree decl)
3011 int rebuild_label_notes_after_reload;
3013 timevar_push (TV_REST_OF_COMPILATION);
3015 /* Register rtl specific functions for cfg. */
3016 rtl_register_cfg_hooks ();
3018 /* Now that we're out of the frontend, we shouldn't have any more
3019 CONCATs anywhere. */
3020 generating_concat_p = 0;
3022 /* When processing delayed functions, prepare_function_start() won't
3023 have been run to re-initialize it. */
3024 cse_not_expected = ! optimize;
3026 /* First, make sure that NOTE_BLOCK is set correctly for each
3027 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3028 if (!cfun->x_whole_function_mode_p)
3031 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3032 tree in sensible shape. So, we just recalculate it here. */
3033 if (cfun->x_whole_function_mode_p)
3038 if (rest_of_handle_inlining (decl))
3039 goto exit_rest_of_compilation;
3041 /* If we're emitting a nested function, make sure its parent gets
3042 emitted as well. Doing otherwise confuses debug info. */
3045 for (parent = DECL_CONTEXT (current_function_decl);
3046 parent != NULL_TREE;
3047 parent = get_containing_scope (parent))
3048 if (TREE_CODE (parent) == FUNCTION_DECL)
3049 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3052 /* We are now committed to emitting code for this function. Do any
3053 preparation, such as emitting abstract debug info for the inline
3054 before it gets mangled by optimization. */
3055 if (DECL_INLINE (decl))
3056 (*debug_hooks->outlining_inline_function) (decl);
3058 /* Remove any notes we don't need. That will make iterating
3059 over the instruction sequence faster, and allow the garbage
3060 collector to reclaim the memory used by the notes. */
3061 remove_unnecessary_notes ();
3066 /* Initialize some variables used by the optimizers. */
3067 init_function_for_compilation ();
3069 if (! DECL_DEFER_OUTPUT (decl))
3070 TREE_ASM_WRITTEN (decl) = 1;
3072 /* Now that integrate will no longer see our rtl, we need not
3073 distinguish between the return value of this function and the
3074 return value of called functions. Also, we can remove all SETs
3075 of subregs of hard registers; they are only here because of
3076 integrate. Also, we can now initialize pseudos intended to
3077 carry magic hard reg data throughout the function. */
3078 rtx_equal_function_value_matters = 0;
3079 purge_hard_subreg_sets (get_insns ());
3081 /* Early return if there were errors. We can run afoul of our
3082 consistency checks, and there's not really much point in fixing them.
3083 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3084 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3085 || errorcount || sorrycount)
3086 goto exit_rest_of_compilation;
3088 timevar_push (TV_JUMP);
3089 open_dump_file (DFI_sibling, decl);
3090 insns = get_insns ();
3091 rebuild_jump_labels (insns);
3092 find_exception_handler_labels ();
3093 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3095 delete_unreachable_blocks ();
3097 /* We have to issue these warnings now already, because CFG cleanups
3098 further down may destroy the required information. */
3099 check_function_return_warnings ();
3101 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3102 if (flag_guess_branch_prob)
3104 timevar_push (TV_BRANCH_PROB);
3105 note_prediction_to_br_prob ();
3106 timevar_pop (TV_BRANCH_PROB);
3109 if (flag_optimize_sibling_calls)
3110 rest_of_handle_sibling_calls (insns);
3112 timevar_pop (TV_JUMP);
3114 insn_locators_initialize ();
3115 /* Complete generation of exception handling code. */
3118 timevar_push (TV_JUMP);
3119 open_dump_file (DFI_eh, decl);
3121 finish_eh_generation ();
3123 close_dump_file (DFI_eh, print_rtl, get_insns ());
3124 timevar_pop (TV_JUMP);
3127 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3128 generation, which might create new sets. */
3129 emit_initial_value_sets ();
3132 /* If we are doing position-independent code generation, now
3133 is the time to output special prologues and epilogues.
3134 We do not want to do this earlier, because it just clutters
3135 up inline functions with meaningless insns. */
3140 insns = get_insns ();
3142 /* Copy any shared structure that should not be shared. */
3143 unshare_all_rtl (current_function_decl, insns);
3145 #ifdef SETJMP_VIA_SAVE_AREA
3146 /* This must be performed before virtual register instantiation.
3147 Please be aware the everything in the compiler that can look
3148 at the RTL up to this point must understand that REG_SAVE_AREA
3149 is just like a use of the REG contained inside. */
3150 if (current_function_calls_alloca)
3151 optimize_save_area_alloca (insns);
3154 /* Instantiate all virtual registers. */
3155 instantiate_virtual_regs (current_function_decl, insns);
3157 open_dump_file (DFI_jump, decl);
3159 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3160 are initialized and to compute whether control can drop off the end
3163 timevar_push (TV_JUMP);
3164 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3165 before jump optimization switches branch directions. */
3166 if (flag_guess_branch_prob)
3167 expected_value_to_br_prob ();
3169 reg_scan (insns, max_reg_num (), 0);
3170 rebuild_jump_labels (insns);
3171 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3172 delete_trivially_dead_insns (insns, max_reg_num ());
3174 dump_flow_info (rtl_dump_file);
3175 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3176 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3180 free_bb_for_insn ();
3181 copy_loop_headers (insns);
3182 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3184 purge_line_number_notes (insns);
3186 timevar_pop (TV_JUMP);
3187 close_dump_file (DFI_jump, print_rtl, insns);
3189 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3190 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3191 goto exit_rest_of_compilation;
3193 /* Long term, this should probably move before the jump optimizer too,
3194 but I didn't want to disturb the rtl_dump_and_exit and related
3195 stuff at this time. */
3196 if (optimize > 0 && flag_ssa)
3197 insns = rest_of_handle_ssa (decl, insns);
3199 timevar_push (TV_JUMP);
3202 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3204 if (flag_delete_null_pointer_checks)
3205 rest_of_handle_null_pointer (decl, insns);
3207 /* Jump optimization, and the removal of NULL pointer checks, may
3208 have reduced the number of instructions substantially. CSE, and
3209 future passes, allocate arrays whose dimensions involve the
3210 maximum instruction UID, so if we can reduce the maximum UID
3211 we'll save big on memory. */
3212 renumber_insns (rtl_dump_file);
3213 timevar_pop (TV_JUMP);
3215 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3220 rest_of_handle_cse (decl, insns);
3222 rest_of_handle_addressof (decl, insns);
3229 rest_of_handle_gcse (decl, insns);
3231 if (flag_loop_optimize)
3232 rest_of_handle_loop_optimize (decl, insns);
3235 rest_of_handle_jump_bypass (decl, insns);
3238 timevar_push (TV_FLOW);
3240 rest_of_handle_cfg (decl, insns);
3243 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3244 rest_of_handle_branch_prob (decl, insns);
3247 rest_of_handle_if_conversion (decl, insns);
3250 rest_of_handle_tracer (decl, insns);
3253 && (flag_unswitch_loops
3255 || flag_unroll_loops))
3256 rest_of_handle_loop2 (decl, insns);
3258 if (flag_rerun_cse_after_loop)
3259 rest_of_handle_cse2 (decl, insns);
3261 cse_not_expected = 1;
3263 rest_of_handle_life (decl, insns);
3266 rest_of_handle_combine (decl, insns);
3268 if (flag_if_conversion)
3269 rest_of_handle_if_after_combine (decl, insns);
3271 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3272 rest_of_handle_regmove (decl, insns);
3274 /* Do unconditional splitting before register allocation to allow machine
3275 description to add extra information not needed previously. */
3276 split_all_insns (1);
3278 #ifdef OPTIMIZE_MODE_SWITCHING
3279 timevar_push (TV_MODE_SWITCH);
3282 optimize_mode_switching (NULL);
3285 timevar_pop (TV_MODE_SWITCH);
3288 /* Any of the several passes since flow1 will have munged register
3289 lifetime data a bit. We need it to be up to date for scheduling
3290 (see handling of reg_known_equiv in init_alias_analysis). */
3291 recompute_reg_usage (insns, !optimize_size);
3293 #ifdef INSN_SCHEDULING
3294 rest_of_handle_sched (decl, insns);
3297 /* Determine if the current function is a leaf before running reload
3298 since this can impact optimizations done by the prologue and
3299 epilogue thus changing register elimination offsets. */
3300 current_function_is_leaf = leaf_function_p ();
3302 timevar_push (TV_LOCAL_ALLOC);
3303 open_dump_file (DFI_lreg, decl);
3305 if (flag_new_regalloc)
3307 if (rest_of_handle_new_regalloc (decl, insns,
3308 &rebuild_label_notes_after_reload))
3309 goto exit_rest_of_compilation;
3313 if (rest_of_handle_old_regalloc (decl, insns,
3314 &rebuild_label_notes_after_reload))
3315 goto exit_rest_of_compilation;
3320 open_dump_file (DFI_postreload, decl);
3322 /* Do a very simple CSE pass over just the hard registers. */
3325 timevar_push (TV_RELOAD_CSE_REGS);
3326 reload_cse_regs (insns);
3327 timevar_pop (TV_RELOAD_CSE_REGS);
3330 /* Register allocation and reloading may have turned an indirect jump into
3331 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3332 jumping instructions. */
3333 if (rebuild_label_notes_after_reload)
3335 timevar_push (TV_JUMP);
3337 rebuild_jump_labels (insns);
3338 purge_all_dead_edges (0);
3340 timevar_pop (TV_JUMP);
3343 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3345 /* Re-create the death notes which were deleted during reload. */
3346 timevar_push (TV_FLOW2);
3347 open_dump_file (DFI_flow2, decl);
3349 #ifdef ENABLE_CHECKING
3350 verify_flow_info ();
3353 /* If optimizing, then go ahead and split insns now. */
3357 split_all_insns (0);
3359 if (flag_branch_target_load_optimize)
3361 open_dump_file (DFI_branch_target_load, decl);
3363 branch_target_load_optimize (insns, false);
3365 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3371 cleanup_cfg (CLEANUP_EXPENSIVE);
3373 /* On some machines, the prologue and epilogue code, or parts thereof,
3374 can be represented as RTL. Doing so lets us schedule insns between
3375 it and the rest of the code and also allows delayed branch
3376 scheduling to operate in the epilogue. */
3377 thread_prologue_and_epilogue_insns (insns);
3378 epilogue_completed = 1;
3382 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3383 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3384 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3386 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3387 even for machines with possibly nonzero RETURN_POPS_ARGS
3388 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3389 push instructions will have popping returns. */
3390 #ifndef PUSH_ROUNDING
3391 if (!ACCUMULATE_OUTGOING_ARGS)
3393 combine_stack_adjustments ();
3398 flow2_completed = 1;
3400 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3401 timevar_pop (TV_FLOW2);
3403 #ifdef HAVE_peephole2
3404 if (optimize > 0 && flag_peephole2)
3406 timevar_push (TV_PEEPHOLE2);
3407 open_dump_file (DFI_peephole2, decl);
3409 peephole2_optimize (rtl_dump_file);
3411 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3412 timevar_pop (TV_PEEPHOLE2);
3418 if (flag_rename_registers || flag_cprop_registers)
3419 rest_of_handle_regrename (decl, insns);
3421 rest_of_handle_reorder_blocks (decl, insns);
3424 if (flag_if_conversion2)
3426 timevar_push (TV_IFCVT2);
3427 open_dump_file (DFI_ce3, decl);
3431 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3432 timevar_pop (TV_IFCVT2);
3435 if (flag_branch_target_load_optimize2)
3437 /* Leave this a warning for now so that it is possible to experiment
3438 with running this pass twice. In 3.6, we should either make this
3439 an error, or use separate dump files. */
3440 if (flag_branch_target_load_optimize)
3441 warning ("branch target register load optimization is not intended "
3444 open_dump_file (DFI_branch_target_load, decl);
3446 branch_target_load_optimize (insns, true);
3448 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3453 #ifdef INSN_SCHEDULING
3454 if (optimize > 0 && flag_schedule_insns_after_reload)
3455 rest_of_handle_sched2 (decl, insns);
3458 #ifdef LEAF_REGISTERS
3459 current_function_uses_only_leaf_regs
3460 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3464 rest_of_handle_stack_regs (decl, insns);
3467 compute_alignments ();
3469 /* CFG is no longer maintained up-to-date. */
3470 free_bb_for_insn ();
3472 if (targetm.machine_dependent_reorg != 0)
3473 rest_of_handle_machine_reorg (decl, insns);
3475 purge_line_number_notes (insns);
3476 cleanup_barriers ();
3479 if (optimize > 0 && flag_delayed_branch)
3480 rest_of_handle_delay_slots (decl, insns);
3483 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3484 timevar_push (TV_SHORTEN_BRANCH);
3485 split_all_insns_noflow ();
3486 timevar_pop (TV_SHORTEN_BRANCH);
3489 convert_to_eh_region_ranges ();
3491 /* Shorten branches. */
3492 timevar_push (TV_SHORTEN_BRANCH);
3493 shorten_branches (get_insns ());
3494 timevar_pop (TV_SHORTEN_BRANCH);
3496 set_nothrow_function_flags ();
3497 if (current_function_nothrow)
3498 /* Now we know that this can't throw; set the flag for the benefit
3499 of other functions later in this translation unit. */
3500 TREE_NOTHROW (current_function_decl) = 1;
3502 rest_of_handle_final (decl, insns);
3504 /* Write DBX symbols if requested. */
3506 /* Note that for those inline functions where we don't initially
3507 know for certain that we will be generating an out-of-line copy,
3508 the first invocation of this routine (rest_of_compilation) will
3509 skip over this code by doing a `goto exit_rest_of_compilation;'.
3510 Later on, wrapup_global_declarations will (indirectly) call
3511 rest_of_compilation again for those inline functions that need
3512 to have out-of-line copies generated. During that call, we
3513 *will* be routed past here. */
3515 timevar_push (TV_SYMOUT);
3516 (*debug_hooks->function_decl) (decl);
3517 timevar_pop (TV_SYMOUT);
3519 exit_rest_of_compilation:
3521 coverage_end_function ();
3523 /* In case the function was not output,
3524 don't leave any temporary anonymous types
3525 queued up for sdb output. */
3526 #ifdef SDB_DEBUGGING_INFO
3527 if (write_symbols == SDB_DEBUG)
3528 sdbout_types (NULL_TREE);
3531 reload_completed = 0;
3532 epilogue_completed = 0;
3533 flow2_completed = 0;
3536 timevar_push (TV_FINAL);
3538 /* Clear out the insn_length contents now that they are no
3540 init_insn_lengths ();
3542 /* Show no temporary slots allocated. */
3545 free_basic_block_vars (0);
3546 free_bb_for_insn ();
3548 timevar_pop (TV_FINAL);
3550 if ((*targetm.binds_local_p) (current_function_decl))
3552 int pref = cfun->preferred_stack_boundary;
3553 if (cfun->recursive_call_emit
3554 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3555 pref = cfun->stack_alignment_needed;
3556 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3560 /* Make sure volatile mem refs aren't considered valid operands for
3561 arithmetic insns. We must call this here if this is a nested inline
3562 function, since the above code leaves us in the init_recog state
3563 (from final.c), and the function context push/pop code does not
3564 save/restore volatile_ok.
3566 ??? Maybe it isn't necessary for expand_start_function to call this
3567 anymore if we do it here? */
3569 init_recog_no_volatile ();
3571 /* We're done with this function. Free up memory if we can. */
3572 free_after_parsing (cfun);
3573 if (! DECL_DEFER_OUTPUT (decl))
3575 free_after_compilation (cfun);
3577 /* Clear integrate.c's pointer to the cfun structure we just
3579 DECL_SAVED_INSNS (decl) = 0;
3585 timevar_pop (TV_REST_OF_COMPILATION);
3588 /* Display help for generic options. */
3594 for (i = LAST_PARAM; i--;)
3596 const char *description = compiler_params[i].help;
3597 const int length = 21 - strlen (compiler_params[i].option);
3599 if (description != NULL && *description != 0)
3600 printf (" --param %s=<value>%.*s%s\n",
3601 compiler_params[i].option,
3602 length > 0 ? length : 1, " ",
3606 for (i = ARRAY_SIZE (debug_args); i--;)
3608 if (debug_args[i].description != NULL)
3609 printf (" -g%-21s %s\n",
3610 debug_args[i].arg, _(debug_args[i].description));
3613 display_target_options ();
3616 /* Display help for target options. */
3618 display_target_options (void)
3621 static bool displayed = false;
3623 /* Avoid double printing for --help --target-help. */
3629 if (ARRAY_SIZE (target_switches) > 1
3630 #ifdef TARGET_OPTIONS
3631 || ARRAY_SIZE (target_options) > 1
3639 printf (_("\nTarget specific options:\n"));
3641 for (i = ARRAY_SIZE (target_switches); i--;)
3643 const char *option = target_switches[i].name;
3644 const char *description = target_switches[i].description;
3646 if (option == NULL || *option == 0)
3648 else if (description == NULL)
3653 printf (_(" -m%-23s [undocumented]\n"), option);
3655 else if (*description != 0)
3656 doc += printf (" -m%-23s %s\n", option, _(description));
3659 #ifdef TARGET_OPTIONS
3660 for (i = ARRAY_SIZE (target_options); i--;)
3662 const char *option = target_options[i].prefix;
3663 const char *description = target_options[i].description;
3665 if (option == NULL || *option == 0)
3667 else if (description == NULL)
3672 printf (_(" -m%-23s [undocumented]\n"), option);
3674 else if (*description != 0)
3675 doc += printf (" -m%-23s %s\n", option, _(description));
3681 printf (_("\nThere are undocumented target specific options as well.\n"));
3683 printf (_(" They exist, but they are not documented.\n"));
3688 /* Parse a -d... command line switch. */
3691 decode_d_option (const char *arg)
3699 for (i = 0; i < (int) DFI_MAX; ++i)
3700 dump_file[i].enabled = 1;
3706 flag_print_asm_name = 1;
3709 flag_dump_rtl_in_asm = 1;
3710 flag_print_asm_name = 1;
3713 graph_dump_format = vcg;
3716 rtl_dump_and_exit = 1;
3721 case 'D': /* These are handled by the preprocessor. */
3725 setup_core_dumping();
3730 for (i = 0; i < (int) DFI_MAX; ++i)
3731 if (c == dump_file[i].debug_switch)
3733 dump_file[i].enabled = 1;
3738 warning ("unrecognized gcc debugging option: %c", c);
3743 /* Indexed by enum debug_info_type. */
3744 const char *const debug_type_names[] =
3746 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3749 /* Parse a -g... command line switch. ARG is the value after the -g.
3750 It is safe to access 'ARG - 2' to generate the full switch name.
3751 Return the number of strings consumed. */
3754 decode_g_option (const char *arg)
3756 static unsigned level = 0;
3757 /* A lot of code assumes write_symbols == NO_DEBUG if the
3758 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3759 of what debugging type has been selected). This records the
3760 selected type. It is an error to specify more than one
3762 static enum debug_info_type selected_debug_type = NO_DEBUG;
3763 /* Nonzero if debugging format has been explicitly set.
3764 -g and -ggdb don't explicitly set the debugging format so
3765 -gdwarf -g3 is equivalent to -gdwarf3. */
3766 static int type_explicitly_set_p = 0;
3768 /* The maximum admissible debug level value. */
3769 static const unsigned max_debug_level = 3;
3771 /* Look up ARG in the table. */
3772 for (da = debug_args; da->arg; da++)
3774 const int da_len = strlen (da->arg);
3776 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
3778 enum debug_info_type type = da->debug_type;
3779 const char *p = arg + da_len;
3781 if (*p && ! ISDIGIT (*p))
3784 /* A debug flag without a level defaults to level 2.
3785 Note we do not want to call read_integral_parameter
3786 for that case since it will call atoi which
3789 ??? We may want to generalize the interface to
3790 read_integral_parameter to better handle this case
3791 if this case shows up often. */
3793 level = read_integral_parameter (p, 0, max_debug_level + 1);
3795 level = (level == 0) ? 2 : level;
3797 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
3799 error ("use -gdwarf -g%d for DWARF v1, level %d",
3802 error ("use -gdwarf-2 for DWARF v2");
3805 if (level > max_debug_level)
3808 ignoring option `%s' due to invalid debug level specification",
3810 level = debug_info_level;
3813 if (type == NO_DEBUG)
3815 type = PREFERRED_DEBUGGING_TYPE;
3817 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
3819 #ifdef DWARF2_DEBUGGING_INFO
3820 type = DWARF2_DEBUG;
3822 #ifdef DBX_DEBUGGING_INFO
3829 if (type == NO_DEBUG)
3830 warning ("`%s': unknown or unsupported -g option", arg - 2);
3832 /* Does it conflict with an already selected type? */
3833 if (type_explicitly_set_p
3834 /* -g/-ggdb don't conflict with anything. */
3835 && da->debug_type != NO_DEBUG
3836 && type != selected_debug_type)
3837 warning ("`%s' ignored, conflicts with `-g%s'",
3838 arg - 2, debug_type_names[(int) selected_debug_type]);
3841 /* If the format has already been set, -g/-ggdb
3842 only change the debug level. */
3843 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
3844 /* Don't change debugging type. */
3848 selected_debug_type = type;
3849 type_explicitly_set_p = da->debug_type != NO_DEBUG;
3852 write_symbols = (level == 0
3854 : selected_debug_type);
3855 use_gnu_debug_info_extensions = da->use_extensions_p;
3856 debug_info_level = (enum debug_info_level) level;
3864 warning ("`-g%s': unknown or unsupported -g option", arg);
3867 /* Decode -m switches. */
3868 /* Decode the switch -mNAME. */
3871 set_target_switch (const char *name)
3874 int valid_target_option = 0;
3876 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3877 if (!strcmp (target_switches[j].name, name))
3879 if (target_switches[j].value < 0)
3880 target_flags &= ~-target_switches[j].value;
3882 target_flags |= target_switches[j].value;
3885 if (target_switches[j].value < 0)
3886 target_flags_explicit |= -target_switches[j].value;
3888 target_flags_explicit |= target_switches[j].value;
3890 valid_target_option = 1;
3893 #ifdef TARGET_OPTIONS
3894 if (!valid_target_option)
3895 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3897 int len = strlen (target_options[j].prefix);
3898 if (target_options[j].value)
3900 if (!strcmp (target_options[j].prefix, name))
3902 *target_options[j].variable = target_options[j].value;
3903 valid_target_option = 1;
3908 if (!strncmp (target_options[j].prefix, name, len))
3910 *target_options[j].variable = name + len;
3911 valid_target_option = 1;
3917 if (!valid_target_option)
3918 error ("invalid option `%s'", name);
3921 /* Print version information to FILE.
3922 Each line begins with INDENT (for the case where FILE is the
3923 assembler output file). */
3926 print_version (FILE *file, const char *indent)
3929 #define __VERSION__ "[?]"
3933 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3935 "%s%s%s version %s (%s) compiled by CC.\n"
3937 , indent, *indent != 0 ? " " : "",
3938 lang_hooks.name, version_string, TARGET_NAME,
3939 indent, __VERSION__);
3940 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3941 indent, *indent != 0 ? " " : "",
3942 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3945 /* Print an option value and return the adjusted position in the line.
3946 ??? We don't handle error returns from fprintf (disk full); presumably
3947 other code will catch a disk full though. */
3950 print_single_switch (FILE *file, int pos, int max,
3951 const char *indent, const char *sep, const char *term,
3952 const char *type, const char *name)
3954 /* The ultrix fprintf returns 0 on success, so compute the result we want
3955 here since we need it for the following test. */
3956 int len = strlen (sep) + strlen (type) + strlen (name);
3961 fprintf (file, "%s", term);
3966 fprintf (file, "%s", indent);
3967 pos = strlen (indent);
3969 fprintf (file, "%s%s%s", sep, type, name);
3974 /* Print active target switches to FILE.
3975 POS is the current cursor position and MAX is the size of a "line".
3976 Each line begins with INDENT and ends with TERM.
3977 Each switch is separated from the next by SEP. */
3980 print_switch_values (FILE *file, int pos, int max,
3981 const char *indent, const char *sep, const char *term)
3986 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3987 that it can be printed below. This helps reproducibility. */
3990 /* Print the options as passed. */
3991 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3992 _("options passed: "), "");
3994 for (p = &save_argv[1]; *p != NULL; p++)
3998 if (strcmp (*p, "-o") == 0)
4004 if (strcmp (*p, "-quiet") == 0)
4006 if (strcmp (*p, "-version") == 0)
4011 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4014 fprintf (file, "%s", term);
4016 /* Print the -f and -m options that have been enabled.
4017 We don't handle language specific options but printing argv
4020 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4021 _("options enabled: "), "");
4023 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4024 if (*f_options[j].variable == f_options[j].on_value)
4025 pos = print_single_switch (file, pos, max, indent, sep, term,
4026 "-f", f_options[j].string);
4028 /* Print target specific options. */
4030 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4031 if (target_switches[j].name[0] != '\0'
4032 && target_switches[j].value > 0
4033 && ((target_switches[j].value & target_flags)
4034 == target_switches[j].value))
4036 pos = print_single_switch (file, pos, max, indent, sep, term,
4037 "-m", target_switches[j].name);
4040 #ifdef TARGET_OPTIONS
4041 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4042 if (*target_options[j].variable != NULL)
4045 sprintf (prefix, "-m%s", target_options[j].prefix);
4046 pos = print_single_switch (file, pos, max, indent, sep, term,
4047 prefix, *target_options[j].variable);
4051 fprintf (file, "%s", term);
4054 /* Open assembly code output file. Do this even if -fsyntax-only is
4055 on, because then the driver will have provided the name of a
4056 temporary file or bit bucket for us. NAME is the file specified on
4057 the command line, possibly NULL. */
4059 init_asm_output (const char *name)
4061 if (name == NULL && asm_file_name == 0)
4062 asm_out_file = stdout;
4065 if (asm_file_name == 0)
4067 int len = strlen (dump_base_name);
4068 char *dumpname = (char *) xmalloc (len + 6);
4069 memcpy (dumpname, dump_base_name, len + 1);
4070 strip_off_ending (dumpname, len);
4071 strcat (dumpname, ".s");
4072 asm_file_name = dumpname;
4074 if (!strcmp (asm_file_name, "-"))
4075 asm_out_file = stdout;
4077 asm_out_file = fopen (asm_file_name, "w+");
4078 if (asm_out_file == 0)
4079 fatal_error ("can't open %s for writing: %m", asm_file_name);
4082 #ifdef IO_BUFFER_SIZE
4083 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4084 _IOFBF, IO_BUFFER_SIZE);
4087 if (!flag_syntax_only)
4089 targetm.asm_out.file_start ();
4091 #ifdef ASM_COMMENT_START
4092 if (flag_verbose_asm)
4094 /* Print the list of options in effect. */
4095 print_version (asm_out_file, ASM_COMMENT_START);
4096 print_switch_values (asm_out_file, 0, MAX_LINE,
4097 ASM_COMMENT_START, " ", "\n");
4098 /* Add a blank line here so it appears in assembler output but not
4100 fprintf (asm_out_file, "\n");
4106 /* Initialization of the front end environment, before command line
4107 options are parsed. Signal handlers, internationalization etc.
4108 ARGV0 is main's argv[0]. */
4110 general_init (const char *argv0)
4114 p = argv0 + strlen (argv0);
4115 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4119 xmalloc_set_program_name (progname);
4123 gcc_init_libintl ();
4125 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4127 signal (SIGSEGV, crash_signal);
4130 signal (SIGILL, crash_signal);
4133 signal (SIGBUS, crash_signal);
4136 signal (SIGABRT, crash_signal);
4138 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4139 signal (SIGIOT, crash_signal);
4142 signal (SIGFPE, crash_signal);
4145 /* Other host-specific signal setup. */
4146 (*host_hooks.extra_signals)();
4148 /* Initialize the diagnostics reporting machinery, so option parsing
4149 can give warnings and errors. */
4150 diagnostic_initialize (global_dc);
4152 /* Initialize the garbage-collector, string pools and tree type hash
4158 /* Initialize register usage now so switches may override. */
4161 /* Register the language-independent parameters. */
4162 add_params (lang_independent_params, LAST_PARAM);
4164 /* This must be done after add_params but before argument processing. */
4165 init_ggc_heuristics();
4168 /* Process the options that have been parsed. */
4170 process_options (void)
4172 /* Allow the front end to perform consistency checks and do further
4173 initialization based on the command line options. This hook also
4174 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4175 so we can correctly initialize debug output. */
4176 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4177 input_filename = main_input_filename;
4179 #ifdef OVERRIDE_OPTIONS
4180 /* Some machines may reject certain combinations of options. */
4184 /* Set aux_base_name if not already set. */
4187 else if (main_input_filename)
4189 char *name = xstrdup (lbasename (main_input_filename));
4191 strip_off_ending (name, strlen (name));
4192 aux_base_name = name;
4195 aux_base_name = "gccaux";
4197 /* Set up the align_*_log variables, defaulting them to 1 if they
4198 were still unset. */
4199 if (align_loops <= 0) align_loops = 1;
4200 if (align_loops_max_skip > align_loops || !align_loops)
4201 align_loops_max_skip = align_loops - 1;
4202 align_loops_log = floor_log2 (align_loops * 2 - 1);
4203 if (align_jumps <= 0) align_jumps = 1;
4204 if (align_jumps_max_skip > align_jumps || !align_jumps)
4205 align_jumps_max_skip = align_jumps - 1;
4206 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4207 if (align_labels <= 0) align_labels = 1;
4208 align_labels_log = floor_log2 (align_labels * 2 - 1);
4209 if (align_labels_max_skip > align_labels || !align_labels)
4210 align_labels_max_skip = align_labels - 1;
4211 if (align_functions <= 0) align_functions = 1;
4212 align_functions_log = floor_log2 (align_functions * 2 - 1);
4214 /* Unrolling all loops implies that standard loop unrolling must also
4216 if (flag_unroll_all_loops)
4217 flag_unroll_loops = 1;
4219 if (flag_unroll_loops)
4221 flag_old_unroll_loops = 0;
4222 flag_old_unroll_all_loops = 0;
4225 if (flag_old_unroll_all_loops)
4226 flag_old_unroll_loops = 1;
4228 /* Old loop unrolling requires that strength_reduction be on also. Silently
4229 turn on strength reduction here if it isn't already on. Also, the loop
4230 unrolling code assumes that cse will be run after loop, so that must
4231 be turned on also. */
4232 if (flag_old_unroll_loops)
4234 flag_strength_reduce = 1;
4235 flag_rerun_cse_after_loop = 1;
4237 if (flag_unroll_loops || flag_peel_loops)
4238 flag_rerun_cse_after_loop = 1;
4240 if (flag_non_call_exceptions)
4241 flag_asynchronous_unwind_tables = 1;
4242 if (flag_asynchronous_unwind_tables)
4243 flag_unwind_tables = 1;
4245 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4247 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4248 flag_unit_at_a_time = 0;
4250 /* Warn about options that are not supported on this machine. */
4251 #ifndef INSN_SCHEDULING
4252 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4253 warning ("instruction scheduling not supported on this target machine");
4256 if (flag_delayed_branch)
4257 warning ("this target machine does not have delayed branches");
4260 user_label_prefix = USER_LABEL_PREFIX;
4261 if (flag_leading_underscore != -1)
4263 /* If the default prefix is more complicated than "" or "_",
4264 issue a warning and ignore this option. */
4265 if (user_label_prefix[0] == 0 ||
4266 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4268 user_label_prefix = flag_leading_underscore ? "_" : "";
4271 warning ("-f%sleading-underscore not supported on this target machine",
4272 flag_leading_underscore ? "" : "no-");
4275 /* If we are in verbose mode, write out the version and maybe all the
4276 option flags in use. */
4279 print_version (stderr, "");
4281 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4284 if (flag_syntax_only)
4286 write_symbols = NO_DEBUG;
4290 /* Now we know write_symbols, set up the debug hooks based on it.
4291 By default we do nothing for debug output. */
4292 #if defined(DBX_DEBUGGING_INFO)
4293 if (write_symbols == DBX_DEBUG)
4294 debug_hooks = &dbx_debug_hooks;
4296 #if defined(XCOFF_DEBUGGING_INFO)
4297 if (write_symbols == XCOFF_DEBUG)
4298 debug_hooks = &xcoff_debug_hooks;
4300 #ifdef SDB_DEBUGGING_INFO
4301 if (write_symbols == SDB_DEBUG)
4302 debug_hooks = &sdb_debug_hooks;
4304 #ifdef DWARF_DEBUGGING_INFO
4305 if (write_symbols == DWARF_DEBUG)
4306 debug_hooks = &dwarf_debug_hooks;
4308 #ifdef DWARF2_DEBUGGING_INFO
4309 if (write_symbols == DWARF2_DEBUG)
4310 debug_hooks = &dwarf2_debug_hooks;
4312 #ifdef VMS_DEBUGGING_INFO
4313 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4314 debug_hooks = &vmsdbg_debug_hooks;
4317 /* If auxiliary info generation is desired, open the output file.
4318 This goes in the same directory as the source file--unlike
4319 all the other output files. */
4320 if (flag_gen_aux_info)
4322 aux_info_file = fopen (aux_info_file_name, "w");
4323 if (aux_info_file == 0)
4324 fatal_error ("can't open %s: %m", aux_info_file_name);
4327 if (! targetm.have_named_sections)
4329 if (flag_function_sections)
4331 warning ("-ffunction-sections not supported for this target");
4332 flag_function_sections = 0;
4334 if (flag_data_sections)
4336 warning ("-fdata-sections not supported for this target");
4337 flag_data_sections = 0;
4341 if (flag_function_sections && profile_flag)
4343 warning ("-ffunction-sections disabled; it makes profiling impossible");
4344 flag_function_sections = 0;
4347 #ifndef HAVE_prefetch
4348 if (flag_prefetch_loop_arrays)
4350 warning ("-fprefetch-loop-arrays not supported for this target");
4351 flag_prefetch_loop_arrays = 0;
4354 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4356 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4357 flag_prefetch_loop_arrays = 0;
4361 /* This combination of options isn't handled for i386 targets and doesn't
4362 make much sense anyway, so don't allow it. */
4363 if (flag_prefetch_loop_arrays && optimize_size)
4365 warning ("-fprefetch-loop-arrays is not supported with -Os");
4366 flag_prefetch_loop_arrays = 0;
4369 #ifndef OBJECT_FORMAT_ELF
4370 if (flag_function_sections && write_symbols != NO_DEBUG)
4371 warning ("-ffunction-sections may affect debugging on some targets");
4374 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4375 if (flag_signaling_nans)
4376 flag_trapping_math = 1;
4379 /* Initialize the compiler back end. */
4383 /* init_emit_once uses reg_raw_mode and therefore must be called
4384 after init_regs which initialized reg_raw_mode. */
4386 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4387 || debug_info_level == DINFO_LEVEL_VERBOSE
4388 #ifdef VMS_DEBUGGING_INFO
4389 /* Enable line number info for traceback. */
4390 || debug_info_level > DINFO_LEVEL_NONE
4392 || flag_test_coverage
4393 || warn_notreached);
4394 init_fake_stack_mems ();
4398 init_function_once ();
4399 init_varasm_once ();
4401 /* The following initialization functions need to generate rtl, so
4402 provide a dummy function context for them. */
4403 init_dummy_function_start ();
4405 if (flag_caller_saves)
4406 init_caller_save ();
4407 expand_dummy_function_end ();
4410 /* Language-dependent initialization. Returns nonzero on success. */
4412 lang_dependent_init (const char *name)
4414 if (dump_base_name == 0)
4415 dump_base_name = name ? name : "gccdump";
4417 /* Other front-end initialization. */
4418 if ((*lang_hooks.init) () == 0)
4421 init_asm_output (name);
4423 /* These create various _DECL nodes, so need to be called after the
4424 front end is initialized. */
4428 /* The following initialization functions need to generate rtl, so
4429 provide a dummy function context for them. */
4430 init_dummy_function_start ();
4432 expand_dummy_function_end ();
4434 /* If dbx symbol table desired, initialize writing it and output the
4435 predefined types. */
4436 timevar_push (TV_SYMOUT);
4438 #ifdef DWARF2_UNWIND_INFO
4439 if (dwarf2out_do_frame ())
4440 dwarf2out_frame_init ();
4443 /* Now we have the correct original filename, we can initialize
4445 (*debug_hooks->init) (name);
4447 timevar_pop (TV_SYMOUT);
4452 /* Clean up: close opened files, etc. */
4457 /* Close the dump files. */
4458 if (flag_gen_aux_info)
4460 fclose (aux_info_file);
4462 unlink (aux_info_file_name);
4465 /* Close non-debugging input and output files. Take special care to note
4466 whether fclose returns an error, since the pages might still be on the
4467 buffer chain while the file is open. */
4471 if (ferror (asm_out_file) != 0)
4472 fatal_error ("error writing to %s: %m", asm_file_name);
4473 if (fclose (asm_out_file) != 0)
4474 fatal_error ("error closing %s: %m", asm_file_name);
4477 /* Do whatever is necessary to finish printing the graphs. */
4478 if (graph_dump_format != no_graph)
4482 for (i = 0; i < (int) DFI_MAX; ++i)
4483 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4488 sprintf (seq, DUMPFILE_FORMAT, i);
4489 suffix = concat (seq, dump_file[i].extension, NULL);
4490 finish_graph_dump_file (dump_base_name, suffix);
4497 ggc_print_statistics ();
4498 stringpool_statistics ();
4499 dump_tree_statistics ();
4502 /* Free up memory for the benefit of leak detectors. */
4505 /* Language-specific end of compilation actions. */
4506 (*lang_hooks.finish) ();
4509 /* Initialize the compiler, and compile the input file. */
4513 /* Initialize timing first. The C front ends read the main file in
4514 the post_options hook, and C++ does file timings. */
4515 if (time_report || !quiet_flag || flag_detailed_statistics)
4517 timevar_start (TV_TOTAL);
4521 /* Don't do any more if an error has already occurred. */
4524 /* Set up the back-end if requested. */
4528 /* Language-dependent initialization. Returns true on success. */
4529 if (lang_dependent_init (main_input_filename))
4531 if (flag_unit_at_a_time)
4533 open_dump_file (DFI_cgraph, NULL);
4534 cgraph_dump_file = rtl_dump_file;
4535 rtl_dump_file = NULL;
4540 if (flag_unit_at_a_time)
4542 rtl_dump_file = cgraph_dump_file;
4543 cgraph_dump_file = NULL;
4544 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4551 /* Stop timing and print the times. */
4552 timevar_stop (TV_TOTAL);
4553 timevar_print (stderr);
4556 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4557 Decode command args, then call compile_file.
4558 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4559 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4561 It is not safe to call this function more than once. */
4564 toplev_main (unsigned int argc, const char **argv)
4568 /* Initialization of GCC's environment, and diagnostics. */
4569 general_init (argv[0]);
4571 /* Parse the options and do minimal processing; basically just
4572 enough to default flags appropriately. */
4573 decode_options (argc, argv);
4577 /* Exit early if we can (e.g. -help). */
4578 if (!exit_after_options)
4581 if (errorcount || sorrycount)
4582 return (FATAL_EXIT_CODE);
4584 return (SUCCESS_EXIT_CODE);