1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
58 #include "basic-block.h"
65 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 /* Carry information from ASM_DECLARE_OBJECT_NAME
100 to ASM_FINISH_DECLARE_OBJECT. */
102 extern int size_directive_output;
103 extern tree last_assemble_variable_decl;
105 extern void reg_alloc (void);
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 static int print_single_switch (FILE *, int, int, const char *,
120 const char *, const char *,
121 const char *, const char *);
122 static void print_switch_values (FILE *, int, int, const char *,
123 const char *, const char *);
125 /* Rest of compilation helper functions. */
126 static bool rest_of_handle_inlining (tree);
127 static rtx rest_of_handle_ssa (tree, rtx);
128 static void rest_of_handle_cse (tree, rtx);
129 static void rest_of_handle_cse2 (tree, rtx);
130 static void rest_of_handle_gcse (tree, rtx);
131 static void rest_of_handle_life (tree, rtx);
132 static void rest_of_handle_loop_optimize (tree, rtx);
133 static void rest_of_handle_loop2 (tree, rtx);
134 static void rest_of_handle_jump_bypass (tree, rtx);
135 static void rest_of_handle_sibling_calls (rtx);
136 static void rest_of_handle_null_pointer (tree, rtx);
137 static void rest_of_handle_addressof (tree, rtx);
138 static void rest_of_handle_cfg (tree, rtx);
139 static void rest_of_handle_branch_prob (tree, rtx);
140 static void rest_of_handle_if_conversion (tree, rtx);
141 static void rest_of_handle_if_after_combine (tree, rtx);
142 static void rest_of_handle_tracer (tree, rtx);
143 static void rest_of_handle_combine (tree, rtx);
144 static void rest_of_handle_regmove (tree, rtx);
145 #ifdef INSN_SCHEDULING
146 static void rest_of_handle_sched (tree, rtx);
147 static void rest_of_handle_sched2 (tree, rtx);
149 static bool rest_of_handle_new_regalloc (tree, rtx, int *);
150 static bool rest_of_handle_old_regalloc (tree, rtx, int *);
151 static void rest_of_handle_regrename (tree, rtx);
152 static void rest_of_handle_reorder_blocks (tree, rtx);
154 static void rest_of_handle_stack_regs (tree, rtx);
156 static void rest_of_handle_machine_reorg (tree, rtx);
158 static void rest_of_handle_delay_slots (tree, rtx);
160 static void rest_of_handle_final (tree, rtx);
162 /* Nonzero to dump debug info whilst parsing (-dy option). */
163 static int set_yydebug;
165 /* True if we don't need a backend (e.g. preprocessing only). */
166 static bool no_backend;
168 /* Length of line when printing switch values. */
171 /* Name of program invoked, sans directories. */
173 const char *progname;
175 /* Copy of argument vector to toplev_main. */
176 static const char **save_argv;
178 /* Name of top-level original source file (what was input to cpp).
179 This comes from the #-command at the beginning of the actual input.
180 If there isn't any there, then this is the cc1 input file name. */
182 const char *main_input_filename;
184 /* Current position in real source file. */
186 location_t input_location;
188 /* Nonzero if it is unsafe to create any new pseudo registers. */
191 /* Stack of currently pending input files. */
193 struct file_stack *input_file_stack;
195 /* Incremented on each change to input_file_stack. */
196 int input_file_stack_tick;
198 /* Name to use as base of names for dump output files. */
200 const char *dump_base_name;
202 /* Name to use as a base for auxiliary output files. */
204 const char *aux_base_name;
206 /* Format to use to print dumpfile index value */
207 #ifndef DUMPFILE_FORMAT
208 #define DUMPFILE_FORMAT ".%02d."
211 /* Bit flags that specify the machine subtype we are compiling for.
212 Bits are tested using macros TARGET_... defined in the tm.h file
213 and set by `-m...' switches. Must be defined in rtlanal.c. */
215 extern int target_flags;
217 /* A mask of target_flags that includes bit X if X was set or cleared
218 on the command line. */
220 int target_flags_explicit;
222 /* Debug hooks - dependent upon command line options. */
224 const struct gcc_debug_hooks *debug_hooks;
226 /* Describes a dump file. */
228 struct dump_file_info
230 /* The unique extension to apply, e.g. ".jump". */
231 const char *const extension;
233 /* The -d<c> character that enables this dump file. */
234 char const debug_switch;
236 /* True if there is a corresponding graph dump file. */
237 char const graph_dump_p;
239 /* True if the user selected this dump. */
242 /* True if the files have been initialized (ie truncated). */
246 /* Enumerate the extant dump files. */
284 DFI_branch_target_load,
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 static struct dump_file_info dump_file[DFI_MAX] =
303 { "cgraph", 'U', 0, 0, 0 },
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "null", 'u', 0, 0, 0 },
313 { "cse", 's', 0, 0, 0 },
314 { "addressof", 'F', 0, 0, 0 },
315 { "gcse", 'G', 1, 0, 0 },
316 { "loop", 'L', 1, 0, 0 },
317 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
318 { "cfg", 'f', 1, 0, 0 },
319 { "bp", 'b', 1, 0, 0 },
320 { "ce1", 'C', 1, 0, 0 },
321 { "tracer", 'T', 1, 0, 0 },
322 { "loop2", 'L', 1, 0, 0 },
323 { "cse2", 't', 1, 0, 0 },
324 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
325 { "combine", 'c', 1, 0, 0 },
326 { "ce2", 'C', 1, 0, 0 },
327 { "regmove", 'N', 1, 0, 0 },
328 { "sched", 'S', 1, 0, 0 },
329 { "lreg", 'l', 1, 0, 0 },
330 { "greg", 'g', 1, 0, 0 },
331 { "postreload", 'o', 1, 0, 0 },
332 { "flow2", 'w', 1, 0, 0 },
333 { "peephole2", 'z', 1, 0, 0 },
334 { "rnreg", 'n', 1, 0, 0 },
335 { "bbro", 'B', 1, 0, 0 },
336 { "ce3", 'E', 1, 0, 0 },
337 { "btl", 'd', 1, 0, 0 }, /* Yes, duplicate enable switch. */
338 { "sched2", 'R', 1, 0, 0 },
339 { "stack", 'k', 1, 0, 0 },
340 { "mach", 'M', 1, 0, 0 },
341 { "dbr", 'd', 0, 0, 0 },
344 static int open_dump_file (enum dump_file_index, tree);
345 static void close_dump_file (enum dump_file_index,
346 void (*) (FILE *, rtx), rtx);
348 /* Other flags saying which kinds of debugging dump have been requested. */
350 int rtl_dump_and_exit;
351 int flag_print_asm_name;
352 enum graph_dump_types graph_dump_format;
354 /* Name for output file of assembly code, specified with -o. */
356 const char *asm_file_name;
358 /* Nonzero means do optimizations. -O.
359 Particular numeric values stand for particular amounts of optimization;
360 thus, -O2 stores 2 here. However, the optimizations beyond the basic
361 ones are not controlled directly by this variable. Instead, they are
362 controlled by individual `flag_...' variables that are defaulted
363 based on this variable. */
367 /* Nonzero means optimize for size. -Os.
368 The only valid values are zero and nonzero. When optimize_size is
369 nonzero, optimize defaults to 2, but certain individual code
370 bloating optimizations are disabled. */
372 int optimize_size = 0;
374 /* The FUNCTION_DECL for the function currently being compiled,
375 or 0 if between functions. */
376 tree current_function_decl;
378 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
380 tree current_function_func_begin_label;
382 /* Nonzero if doing dwarf2 duplicate elimination. */
384 int flag_eliminate_dwarf2_dups = 0;
386 /* Nonzero if doing unused type elimination. */
388 int flag_eliminate_unused_debug_types = 1;
390 /* Nonzero means emit debugging information only for symbols which are used. */
391 int flag_debug_only_used_symbols = 0;
393 /* Nonzero if generating code to do profiling. */
395 int profile_flag = 0;
397 /* Nonzero if generating code to profile program flow graph arcs. */
399 int profile_arc_flag = 0;
401 /* Nonzero if value histograms should be measured. */
403 int flag_profile_values = 0;
405 /* Nonzero if generating info for gcov to calculate line test coverage. */
407 int flag_test_coverage = 0;
409 /* Nonzero indicates that branch taken probabilities should be calculated. */
411 int flag_branch_probabilities = 0;
413 /* Nonzero if basic blocks should be reordered. */
415 int flag_reorder_blocks = 0;
417 /* Nonzero if functions should be reordered. */
419 int flag_reorder_functions = 0;
421 /* Nonzero if registers should be renamed. */
423 int flag_rename_registers = 0;
424 int flag_cprop_registers = 0;
426 /* Nonzero for -pedantic switch: warn about anything
427 that standard spec forbids. */
431 /* Temporarily suppress certain warnings.
432 This is set while reading code from a system header file. */
434 int in_system_header = 0;
436 /* Don't print functions as they are compiled. -quiet. */
440 /* Print times taken by the various passes. -ftime-report. */
444 /* Print memory still in use at end of compilation (which may have little
445 to do with peak memory consumption). -fmem-report. */
449 /* Nonzero means to collect statistics which might be expensive
450 and to print them when we are done. */
451 int flag_detailed_statistics = 0;
453 /* A random sequence of characters, unless overridden by user. */
454 const char *flag_random_seed;
456 /* A local time stamp derived from the time of compilation. It will be
457 zero if the system cannot provide a time. It will be -1u, if the
458 user has specified a particular random seed. */
463 /* Nonzero means `char' should be signed. */
465 int flag_signed_char;
467 /* Nonzero means give an enum type only as many bytes as it needs. */
469 int flag_short_enums;
471 /* Nonzero for -fcaller-saves: allocate values in regs that need to
472 be saved across function calls, if that produces overall better code.
473 Optional now, so people can test it. */
475 #ifdef DEFAULT_CALLER_SAVES
476 int flag_caller_saves = 1;
478 int flag_caller_saves = 0;
481 /* Nonzero if structures and unions should be returned in memory.
483 This should only be defined if compatibility with another compiler or
484 with an ABI is needed, because it results in slower code. */
486 #ifndef DEFAULT_PCC_STRUCT_RETURN
487 #define DEFAULT_PCC_STRUCT_RETURN 1
490 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
492 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
494 /* Nonzero for -fforce-mem: load memory value into a register
495 before arithmetic on it. This makes better cse but slower compilation. */
497 int flag_force_mem = 0;
499 /* Nonzero for -fforce-addr: load memory address into a register before
500 reference to memory. This makes better cse but slower compilation. */
502 int flag_force_addr = 0;
504 /* Nonzero for -fdefer-pop: don't pop args after each function call;
505 instead save them up to pop many calls' args with one insns. */
507 int flag_defer_pop = 0;
509 /* Nonzero for -ffloat-store: don't allocate floats and doubles
510 in extended-precision registers. */
512 int flag_float_store = 0;
514 /* Nonzero for -fcse-follow-jumps:
515 have cse follow jumps to do a more extensive job. */
517 int flag_cse_follow_jumps;
519 /* Nonzero for -fcse-skip-blocks:
520 have cse follow a branch around a block. */
521 int flag_cse_skip_blocks;
523 /* Nonzero for -fexpensive-optimizations:
524 perform miscellaneous relatively-expensive optimizations. */
525 int flag_expensive_optimizations;
527 /* Nonzero for -fthread-jumps:
528 have jump optimize output of loop. */
530 int flag_thread_jumps;
532 /* Nonzero enables strength-reduction in loop.c. */
534 int flag_strength_reduce = 0;
536 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
537 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
538 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
541 int flag_old_unroll_loops;
543 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
544 This is generally not a win. */
546 int flag_old_unroll_all_loops;
548 /* Enables unrolling of simple loops in loop-unroll.c. */
549 int flag_unroll_loops;
551 /* Enables unrolling of all loops in loop-unroll.c. */
552 int flag_unroll_all_loops;
554 /* Nonzero enables loop peeling. */
557 /* Nonzero enables loop unswitching. */
558 int flag_unswitch_loops;
560 /* Nonzero enables prefetch optimizations for arrays in loops. */
562 int flag_prefetch_loop_arrays;
564 /* Nonzero forces all invariant computations in loops to be moved
567 int flag_move_all_movables = 0;
569 /* Nonzero forces all general induction variables in loops to be
572 int flag_reduce_all_givs = 0;
574 /* Nonzero to perform full register move optimization passes. This is the
577 int flag_regmove = 0;
579 /* Nonzero for -fwritable-strings:
580 store string constants in data segment and don't uniquize them. */
582 int flag_writable_strings = 0;
584 /* Nonzero means don't put addresses of constant functions in registers.
585 Used for compiling the Unix kernel, where strange substitutions are
586 done on the assembly output. */
588 int flag_no_function_cse = 0;
590 /* Nonzero for -fomit-frame-pointer:
591 don't make a frame pointer in simple functions that don't require one. */
593 int flag_omit_frame_pointer = 0;
595 /* Nonzero means place each function into its own section on those platforms
596 which support arbitrary section names and unlimited numbers of sections. */
598 int flag_function_sections = 0;
600 /* ... and similar for data. */
602 int flag_data_sections = 0;
604 /* Nonzero to inhibit use of define_optimization peephole opts. */
606 int flag_no_peephole = 0;
608 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
610 int flag_optimize_sibling_calls = 0;
612 /* Nonzero means the front end generally wants `errno' maintained by math
613 operations, like built-in SQRT. */
615 int flag_errno_math = 1;
617 /* Nonzero means that unsafe floating-point math optimizations are allowed
618 for the sake of speed. IEEE compliance is not guaranteed, and operations
619 are allowed to assume that their arguments and results are "normal"
620 (e.g., nonnegative for SQRT). */
622 int flag_unsafe_math_optimizations = 0;
624 /* Nonzero means that no NaNs or +-Infs are expected. */
626 int flag_finite_math_only = 0;
628 /* Zero means that floating-point math operations cannot generate a
629 (user-visible) trap. This is the case, for example, in nonstop
630 IEEE 754 arithmetic. Trapping conditions include division by zero,
631 overflow, underflow, invalid and inexact, but does not include
632 operations on signaling NaNs (see below). */
634 int flag_trapping_math = 1;
636 /* Nonzero means disable transformations observable by signaling NaNs.
637 This option implies that any operation on an IEEE signaling NaN can
638 generate a (user-visible) trap. */
640 int flag_signaling_nans = 0;
642 /* 0 means straightforward implementation of complex divide acceptable.
643 1 means wide ranges of inputs must work for complex divide.
644 2 means C99-like requirements for complex divide (not yet implemented). */
646 int flag_complex_divide_method = 0;
648 /* Nonzero means just do syntax checking; don't output anything. */
650 int flag_syntax_only = 0;
652 /* Nonzero means perform loop optimizer. */
654 int flag_loop_optimize;
656 /* Nonzero means perform crossjumping. */
658 int flag_crossjumping;
660 /* Nonzero means perform if conversion. */
662 int flag_if_conversion;
664 /* Nonzero means perform if conversion after reload. */
666 int flag_if_conversion2;
668 /* Nonzero means to use global dataflow analysis to eliminate
669 useless null pointer tests. */
671 int flag_delete_null_pointer_checks;
673 /* Nonzero means perform global CSE. */
677 /* Nonzero means to do the enhanced load motion during gcse, which trys
678 to hoist loads by not killing them when a store to the same location
681 int flag_gcse_lm = 1;
683 /* Nonzero means to perform store motion after gcse, which will try to
684 move stores closer to the exit block. Its not very effective without
687 int flag_gcse_sm = 1;
689 /* Perform target register optimization before prologue / epilogue
692 int flag_branch_target_load_optimize = 0;
694 /* Perform target register optimization after prologue / epilogue
695 threading and jump2. */
697 int flag_branch_target_load_optimize2 = 0;
699 /* Nonzero means to rerun cse after loop optimization. This increases
700 compilation time about 20% and picks up a few more common expressions. */
702 int flag_rerun_cse_after_loop;
704 /* Nonzero means to run loop optimizations twice. */
706 int flag_rerun_loop_opt;
708 /* Nonzero for -finline-functions: ok to inline functions that look like
709 good inline candidates. */
711 int flag_inline_functions;
713 /* Nonzero for -fkeep-inline-functions: even if we make a function
714 go inline everywhere, keep its definition around for debugging
717 int flag_keep_inline_functions;
719 /* Nonzero means that functions will not be inlined. */
721 int flag_no_inline = 2;
723 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
724 not just because the tree inliner turned us off. */
726 int flag_really_no_inline = 2;
728 /* Nonzero means that we should emit static const variables
729 regardless of whether or not optimization is turned on. */
731 int flag_keep_static_consts = 1;
733 /* Nonzero means we should be saving declaration info into a .X file. */
735 int flag_gen_aux_info = 0;
737 /* Specified name of aux-info file. */
739 const char *aux_info_file_name;
741 /* Nonzero means make the text shared if supported. */
743 int flag_shared_data;
745 /* Nonzero means schedule into delayed branch slots if supported. */
747 int flag_delayed_branch;
749 /* Nonzero if we are compiling pure (sharable) code.
750 Value is 1 if we are doing "small" pic; value is 2 if we're doing
755 /* Nonzero if we are compiling position independent code for executable.
756 The value is 1 if we are doing "small" pic; value is 2 if we're doing
761 /* Nonzero if we are compiling code for a shared library, zero for
766 /* Set to the default thread-local storage (tls) model to use. */
768 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
770 /* Nonzero means generate extra code for exception handling and enable
771 exception handling. */
775 /* Nonzero means generate frame unwind info table when supported. */
777 int flag_unwind_tables = 0;
779 /* Nonzero means generate frame unwind info table exact at each insn
782 int flag_asynchronous_unwind_tables = 0;
784 /* Nonzero means don't place uninitialized global data in common storage
789 /* Nonzero means change certain warnings into errors.
790 Usually these are warnings about failure to conform to some standard. */
792 int flag_pedantic_errors = 0;
794 /* flag_schedule_insns means schedule insns within basic blocks (before
796 flag_schedule_insns_after_reload means schedule insns after
799 int flag_schedule_insns = 0;
800 int flag_schedule_insns_after_reload = 0;
802 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
803 int flag_sched2_use_superblocks = 0;
805 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
807 int flag_sched2_use_traces = 0;
809 /* The following flags have effect only for scheduling before register
812 flag_schedule_interblock means schedule insns across basic blocks.
813 flag_schedule_speculative means allow speculative motion of non-load insns.
814 flag_schedule_speculative_load means allow speculative motion of some
816 flag_schedule_speculative_load_dangerous allows speculative motion of more
819 int flag_schedule_interblock = 1;
820 int flag_schedule_speculative = 1;
821 int flag_schedule_speculative_load = 0;
822 int flag_schedule_speculative_load_dangerous = 0;
824 int flag_single_precision_constant;
826 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
827 by a cheaper branch on a count register. */
828 int flag_branch_on_count_reg = 1;
830 /* -finhibit-size-directive inhibits output of .size for ELF.
831 This is used only for compiling crtstuff.c,
832 and it may be extended to other effects
833 needed for crtstuff.c on other systems. */
834 int flag_inhibit_size_directive = 0;
836 /* -fverbose-asm causes extra commentary information to be produced in
837 the generated assembly code (to make it more readable). This option
838 is generally only of use to those who actually need to read the
839 generated assembly code (perhaps while debugging the compiler itself).
840 -fno-verbose-asm, the default, causes the extra information
841 to be omitted and is useful when comparing two assembler files. */
843 int flag_verbose_asm = 0;
845 /* -dA causes debug commentary information to be produced in
846 the generated assembly code (to make it more readable). This option
847 is generally only of use to those who actually need to read the
848 generated assembly code (perhaps while debugging the compiler itself).
849 Currently, this switch is only used by dwarfout.c; however, it is intended
850 to be a catchall for printing debug information in the assembler file. */
852 int flag_debug_asm = 0;
854 /* -dP causes the rtl to be emitted as a comment in assembly. */
856 int flag_dump_rtl_in_asm = 0;
858 /* -fgnu-linker specifies use of the GNU linker for initializations.
859 (Or, more generally, a linker that handles initializations.)
860 -fno-gnu-linker says that collect2 will be used. */
862 int flag_gnu_linker = 0;
864 int flag_gnu_linker = 1;
867 /* Nonzero means put zero initialized data in the bss section. */
868 int flag_zero_initialized_in_bss = 1;
873 /* Enable ssa conditional constant propagation. */
874 int flag_ssa_ccp = 0;
876 /* Enable ssa aggressive dead code elimination. */
877 int flag_ssa_dce = 0;
879 /* Tag all structures with __attribute__(packed). */
880 int flag_pack_struct = 0;
882 /* Emit code to check for stack overflow; also may cause large objects
883 to be allocated dynamically. */
884 int flag_stack_check;
886 /* When non-NULL, indicates that whenever space is allocated on the
887 stack, the resulting stack pointer must not pass this
888 address---that is, for stacks that grow downward, the stack pointer
889 must always be greater than or equal to this address; for stacks
890 that grow upward, the stack pointer must be less than this address.
891 At present, the rtx may be either a REG or a SYMBOL_REF, although
892 the support provided depends on the backend. */
895 /* 0 if pointer arguments may alias each other. True in C.
896 1 if pointer arguments may not alias each other but may alias
898 2 if pointer arguments may not alias each other and may not
899 alias global variables. True in Fortran.
900 This defaults to 0 for C. */
901 int flag_argument_noalias = 0;
903 /* Nonzero if we should do (language-dependent) alias analysis.
904 Typically, this analysis will assume that expressions of certain
905 types do not alias expressions of certain other types. Only used
906 if alias analysis (in general) is enabled. */
907 int flag_strict_aliasing = 0;
909 /* Instrument functions with calls at entry and exit, for profiling. */
910 int flag_instrument_function_entry_exit = 0;
912 /* Nonzero means ignore `#ident' directives. 0 means handle them.
913 On SVR4 targets, it also controls whether or not to emit a
914 string identifying the compiler. */
916 int flag_no_ident = 0;
918 /* This will perform a peephole pass before sched2. */
919 int flag_peephole2 = 0;
921 /* This will try to guess branch probabilities. */
922 int flag_guess_branch_prob = 0;
924 /* -fcheck-bounds causes gcc to generate array bounds checks.
925 For C, C++, ObjC: defaults to off.
926 For Java: defaults to on.
927 For Fortran: defaults to off. */
928 int flag_bounds_check = 0;
930 /* This will attempt to merge constant section constants, if 1 only
931 string constants and constants from constant pool, if 2 also constant
933 int flag_merge_constants = 1;
935 /* If one, renumber instruction UIDs to reduce the number of
936 unused UIDs if there are a lot of instructions. If greater than
937 one, unconditionally renumber instruction UIDs. */
938 int flag_renumber_insns = 1;
940 /* If nonzero, use the graph coloring register allocator. */
941 int flag_new_regalloc = 0;
943 /* Nonzero if we perform superblock formation. */
947 /* Nonzero if we perform whole unit at a time compilation. */
949 int flag_unit_at_a_time = 0;
951 /* Values of the -falign-* flags: how much to align labels in code.
952 0 means `use default', 1 means `don't align'.
953 For each variable, there is an _log variant which is the power
954 of two not less than the variable, for .align output. */
958 int align_loops_max_skip;
961 int align_jumps_max_skip;
963 int align_labels_log;
964 int align_labels_max_skip;
966 int align_functions_log;
968 /* Like align_functions_log above, but used by front-ends to force the
969 minimum function alignment. Zero means no alignment is forced. */
970 int force_align_functions_log;
974 const char *const string;
978 lang_independent_options;
980 /* Nonzero if signed arithmetic overflow should trap. */
983 /* Nonzero if signed arithmetic overflow should wrap around. */
986 /* Add or remove a leading underscore from user symbols. */
987 int flag_leading_underscore = -1;
989 /* The user symbol prefix after having resolved same. */
990 const char *user_label_prefix;
992 static const param_info lang_independent_params[] = {
993 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
994 { OPTION, DEFAULT, HELP },
995 #include "params.def"
1000 /* Table of language-independent -f options.
1001 STRING is the option name. VARIABLE is the address of the variable.
1002 ON_VALUE is the value to store in VARIABLE
1003 if `-fSTRING' is seen as an option.
1004 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1006 static const lang_independent_options f_options[] =
1008 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
1009 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
1010 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
1011 {"float-store", &flag_float_store, 1 },
1012 {"defer-pop", &flag_defer_pop, 1 },
1013 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
1014 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
1015 {"tracer", &flag_tracer, 1 },
1016 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
1017 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
1018 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
1019 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
1020 {"thread-jumps", &flag_thread_jumps, 1 },
1021 {"strength-reduce", &flag_strength_reduce, 1 },
1022 {"unroll-loops", &flag_unroll_loops, 1 },
1023 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
1024 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
1025 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
1026 {"peel-loops", &flag_peel_loops, 1 },
1027 {"unswitch-loops", &flag_unswitch_loops, 1 },
1028 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
1029 {"move-all-movables", &flag_move_all_movables, 1 },
1030 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
1031 {"writable-strings", &flag_writable_strings, 1 },
1032 {"peephole", &flag_no_peephole, 0 },
1033 {"force-mem", &flag_force_mem, 1 },
1034 {"force-addr", &flag_force_addr, 1 },
1035 {"function-cse", &flag_no_function_cse, 0 },
1036 {"inline-functions", &flag_inline_functions, 1 },
1037 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
1038 {"inline", &flag_no_inline, 0 },
1039 {"keep-static-consts", &flag_keep_static_consts, 1 },
1040 {"syntax-only", &flag_syntax_only, 1 },
1041 {"shared-data", &flag_shared_data, 1 },
1042 {"caller-saves", &flag_caller_saves, 1 },
1043 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
1044 {"reg-struct-return", &flag_pcc_struct_return, 0 },
1045 {"delayed-branch", &flag_delayed_branch, 1 },
1046 {"gcse", &flag_gcse, 1 },
1047 {"gcse-lm", &flag_gcse_lm, 1 },
1048 {"gcse-sm", &flag_gcse_sm, 1 },
1049 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
1050 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
1051 {"loop-optimize", &flag_loop_optimize, 1 },
1052 {"crossjumping", &flag_crossjumping, 1 },
1053 {"if-conversion", &flag_if_conversion, 1 },
1054 {"if-conversion2", &flag_if_conversion2, 1 },
1055 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1056 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1057 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1058 {"schedule-insns", &flag_schedule_insns, 1 },
1059 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1060 {"sched-interblock",&flag_schedule_interblock, 1 },
1061 {"sched-spec",&flag_schedule_speculative, 1 },
1062 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1063 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1064 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1065 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1066 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1067 {"pic", &flag_pic, 1 },
1068 {"PIC", &flag_pic, 2 },
1069 {"pie", &flag_pie, 1 },
1070 {"PIE", &flag_pie, 2 },
1071 {"exceptions", &flag_exceptions, 1 },
1072 {"unwind-tables", &flag_unwind_tables, 1 },
1073 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1074 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1075 {"profile-arcs", &profile_arc_flag, 1 },
1076 {"test-coverage", &flag_test_coverage, 1 },
1077 {"branch-probabilities", &flag_branch_probabilities, 1 },
1078 {"profile", &profile_flag, 1 },
1079 {"reorder-blocks", &flag_reorder_blocks, 1 },
1080 {"reorder-functions", &flag_reorder_functions, 1 },
1081 {"rename-registers", &flag_rename_registers, 1 },
1082 {"cprop-registers", &flag_cprop_registers, 1 },
1083 {"common", &flag_no_common, 0 },
1084 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1085 {"function-sections", &flag_function_sections, 1 },
1086 {"data-sections", &flag_data_sections, 1 },
1087 {"verbose-asm", &flag_verbose_asm, 1 },
1088 {"gnu-linker", &flag_gnu_linker, 1 },
1089 {"regmove", &flag_regmove, 1 },
1090 {"optimize-register-move", &flag_regmove, 1 },
1091 {"pack-struct", &flag_pack_struct, 1 },
1092 {"stack-check", &flag_stack_check, 1 },
1093 {"argument-alias", &flag_argument_noalias, 0 },
1094 {"argument-noalias", &flag_argument_noalias, 1 },
1095 {"argument-noalias-global", &flag_argument_noalias, 2 },
1096 {"strict-aliasing", &flag_strict_aliasing, 1 },
1097 {"align-loops", &align_loops, 0 },
1098 {"align-jumps", &align_jumps, 0 },
1099 {"align-labels", &align_labels, 0 },
1100 {"align-functions", &align_functions, 0 },
1101 {"merge-constants", &flag_merge_constants, 1 },
1102 {"merge-all-constants", &flag_merge_constants, 2 },
1103 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1104 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1105 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1106 {"ssa", &flag_ssa, 1 },
1107 {"ssa-ccp", &flag_ssa_ccp, 1 },
1108 {"ssa-dce", &flag_ssa_dce, 1 },
1109 {"leading-underscore", &flag_leading_underscore, 1 },
1110 {"ident", &flag_no_ident, 0 },
1111 { "peephole2", &flag_peephole2, 1 },
1112 {"finite-math-only", &flag_finite_math_only, 1 },
1113 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1114 {"math-errno", &flag_errno_math, 1 },
1115 {"trapping-math", &flag_trapping_math, 1 },
1116 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1117 {"signaling-nans", &flag_signaling_nans, 1 },
1118 {"bounds-check", &flag_bounds_check, 1 },
1119 {"single-precision-constant", &flag_single_precision_constant, 1 },
1120 {"time-report", &time_report, 1 },
1121 {"mem-report", &mem_report, 1 },
1122 { "trapv", &flag_trapv, 1 },
1123 { "wrapv", &flag_wrapv, 1 },
1124 { "new-ra", &flag_new_regalloc, 1 }
1127 /* Here is a table, controlled by the tm.h file, listing each -m switch
1128 and which bits in `target_switches' it should set or clear.
1129 If VALUE is positive, it is bits to set.
1130 If VALUE is negative, -VALUE is bits to clear.
1131 (The sign bit is not used so there is no confusion.) */
1135 const char *const name;
1137 const char *const description;
1139 target_switches[] = TARGET_SWITCHES;
1141 /* This table is similar, but allows the switch to have a value. */
1143 #ifdef TARGET_OPTIONS
1146 const char *const prefix;
1147 const char **const variable;
1148 const char *const description;
1149 const char *const value;
1151 target_options[] = TARGET_OPTIONS;
1154 /* Nonzero means warn about function definitions that default the return type
1155 or that use a null return and have a return-type other than void. */
1157 int warn_return_type;
1159 /* Output files for assembler code (real compiler output)
1160 and debugging dumps. */
1163 FILE *aux_info_file;
1164 FILE *rtl_dump_file = NULL;
1165 FILE *cgraph_dump_file = NULL;
1167 /* The current working directory of a translation. It's generally the
1168 directory from which compilation was initiated, but a preprocessed
1169 file may specify the original directory in which it was
1172 static const char *src_pwd;
1174 /* Initialize src_pwd with the given string, and return true. If it
1175 was already initialized, return false. As a special case, it may
1176 be called with a NULL argument to test whether src_pwd has NOT been
1180 set_src_pwd (const char *pwd)
1185 src_pwd = xstrdup (pwd);
1189 /* Return the directory from which the translation unit was initiated,
1190 in case set_src_pwd() was not called before to assign it a
1197 src_pwd = getpwd ();
1202 /* Set up a default flag_random_seed and local_tick, unless the user
1203 already specified one. */
1208 if (!flag_random_seed)
1210 unsigned HOST_WIDE_INT value;
1211 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1213 /* Get some more or less random data. */
1214 #ifdef HAVE_GETTIMEOFDAY
1218 gettimeofday (&tv, NULL);
1219 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1223 time_t now = time (NULL);
1225 if (now != (time_t)-1)
1226 local_tick = (unsigned) now;
1229 value = local_tick ^ getpid ();
1231 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1232 flag_random_seed = random_seed;
1234 else if (!local_tick)
1239 /* Decode the string P as an integral parameter.
1240 If the string is indeed an integer return its numeric value else
1241 issue an Invalid Option error for the option PNAME and return DEFVAL.
1242 If PNAME is zero just return DEFVAL, do not call error. */
1245 read_integral_parameter (const char *p, const char *pname, const int defval)
1247 const char *endp = p;
1251 if (ISDIGIT (*endp))
1260 error ("invalid option argument `%s'", pname);
1267 /* Return the logarithm of X, base 2, considering X unsigned,
1268 if X is a power of 2. Otherwise, returns -1.
1270 This should be used via the `exact_log2' macro. */
1273 exact_log2_wide (unsigned HOST_WIDE_INT x)
1276 /* Test for 0 or a power of 2. */
1277 if (x == 0 || x != (x & -x))
1279 while ((x >>= 1) != 0)
1284 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1285 If X is 0, return -1.
1287 This should be used via the floor_log2 macro. */
1290 floor_log2_wide (unsigned HOST_WIDE_INT x)
1299 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1300 into ICE messages, which is much more user friendly. In case the
1301 error printer crashes, reset the signal to prevent infinite recursion. */
1304 crash_signal (int signo)
1306 signal (signo, SIG_DFL);
1307 internal_error ("%s", strsignal (signo));
1310 /* Arrange to dump core on error. (The regular error message is still
1311 printed first, except in the case of abort().) */
1314 setup_core_dumping (void)
1317 signal (SIGABRT, SIG_DFL);
1319 #if defined(HAVE_SETRLIMIT)
1322 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1323 fatal_error ("getting core file size maximum limit: %m");
1324 rlim.rlim_cur = rlim.rlim_max;
1325 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1326 fatal_error ("setting core file size limit to maximum: %m");
1329 diagnostic_abort_on_error (global_dc);
1333 /* Strip off a legitimate source ending from the input string NAME of
1334 length LEN. Rather than having to know the names used by all of
1335 our front ends, we strip off an ending of a period followed by
1336 up to five characters. (Java uses ".class".) */
1339 strip_off_ending (char *name, int len)
1342 for (i = 2; i < 6 && len > i; i++)
1344 if (name[len - i] == '.')
1346 name[len - i] = '\0';
1352 /* Output a quoted string. */
1355 output_quoted_string (FILE *asm_file, const char *string)
1357 #ifdef OUTPUT_QUOTED_STRING
1358 OUTPUT_QUOTED_STRING (asm_file, string);
1362 putc ('\"', asm_file);
1363 while ((c = *string++) != 0)
1367 if (c == '\"' || c == '\\')
1368 putc ('\\', asm_file);
1372 fprintf (asm_file, "\\%03o", (unsigned char) c);
1374 putc ('\"', asm_file);
1378 /* Output a file name in the form wanted by System V. */
1381 output_file_directive (FILE *asm_file, const char *input_name)
1383 int len = strlen (input_name);
1384 const char *na = input_name + len;
1386 /* NA gets INPUT_NAME sans directory names. */
1387 while (na > input_name)
1389 if (IS_DIR_SEPARATOR (na[-1]))
1394 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1395 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1397 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1398 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1400 fprintf (asm_file, "\t.file\t");
1401 output_quoted_string (asm_file, na);
1402 fputc ('\n', asm_file);
1407 /* Routine to open a dump file. Return true if the dump file is enabled. */
1410 open_dump_file (enum dump_file_index index, tree decl)
1413 const char *open_arg;
1416 if (! dump_file[index].enabled)
1419 timevar_push (TV_DUMP);
1420 if (rtl_dump_file != NULL)
1421 fclose (rtl_dump_file);
1423 sprintf (seq, DUMPFILE_FORMAT, index);
1425 if (! dump_file[index].initialized)
1427 /* If we've not initialized the files, do so now. */
1428 if (graph_dump_format != no_graph
1429 && dump_file[index].graph_dump_p)
1431 dump_name = concat (seq, dump_file[index].extension, NULL);
1432 clean_graph_dump_file (dump_base_name, dump_name);
1435 dump_file[index].initialized = 1;
1441 dump_name = concat (dump_base_name, seq,
1442 dump_file[index].extension, NULL);
1444 rtl_dump_file = fopen (dump_name, open_arg);
1445 if (rtl_dump_file == NULL)
1446 fatal_error ("can't open %s: %m", dump_name);
1451 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1452 (*lang_hooks.decl_printable_name) (decl, 2),
1453 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1455 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1456 ? " (unlikely executed)"
1459 timevar_pop (TV_DUMP);
1463 /* Routine to close a dump file. */
1466 close_dump_file (enum dump_file_index index,
1467 void (*func) (FILE *, rtx),
1470 if (! rtl_dump_file)
1473 timevar_push (TV_DUMP);
1475 && graph_dump_format != no_graph
1476 && dump_file[index].graph_dump_p)
1481 sprintf (seq, DUMPFILE_FORMAT, index);
1482 suffix = concat (seq, dump_file[index].extension, NULL);
1483 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1488 func (rtl_dump_file, insns);
1490 fflush (rtl_dump_file);
1491 fclose (rtl_dump_file);
1493 rtl_dump_file = NULL;
1494 timevar_pop (TV_DUMP);
1497 /* Do any final processing required for the declarations in VEC, of
1498 which there are LEN. We write out inline functions and variables
1499 that have been deferred until this point, but which are required.
1500 Returns nonzero if anything was put out. */
1503 wrapup_global_declarations (tree *vec, int len)
1508 int output_something = 0;
1510 for (i = 0; i < len; i++)
1514 /* We're not deferring this any longer. Assignment is
1515 conditional to avoid needlessly dirtying PCH pages. */
1516 if (DECL_DEFER_OUTPUT (decl) != 0)
1517 DECL_DEFER_OUTPUT (decl) = 0;
1519 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1520 (*lang_hooks.finish_incomplete_decl) (decl);
1523 /* Now emit any global variables or functions that we have been
1524 putting off. We need to loop in case one of the things emitted
1525 here references another one which comes earlier in the list. */
1529 for (i = 0; i < len; i++)
1533 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1536 /* Don't write out static consts, unless we still need them.
1538 We also keep static consts if not optimizing (for debugging),
1539 unless the user specified -fno-keep-static-consts.
1540 ??? They might be better written into the debug information.
1541 This is possible when using DWARF.
1543 A language processor that wants static constants to be always
1544 written out (even if it is not used) is responsible for
1545 calling rest_of_decl_compilation itself. E.g. the C front-end
1546 calls rest_of_decl_compilation from finish_decl.
1547 One motivation for this is that is conventional in some
1548 environments to write things like:
1549 static const char rcsid[] = "... version string ...";
1550 intending to force the string to be in the executable.
1552 A language processor that would prefer to have unneeded
1553 static constants "optimized away" would just defer writing
1554 them out until here. E.g. C++ does this, because static
1555 constants are often defined in header files.
1557 ??? A tempting alternative (for both C and C++) would be
1558 to force a constant to be written if and only if it is
1559 defined in a main file, as opposed to an include file. */
1561 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1565 if (flag_unit_at_a_time
1566 && cgraph_varpool_node (decl)->finalized)
1568 else if (flag_unit_at_a_time
1569 && (TREE_USED (decl)
1570 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1572 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1574 else if (DECL_COMDAT (decl))
1576 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1577 && (optimize || !flag_keep_static_consts
1578 || DECL_ARTIFICIAL (decl)))
1584 rest_of_decl_compilation (decl, NULL, 1, 1);
1588 if (TREE_CODE (decl) == FUNCTION_DECL
1589 && DECL_INITIAL (decl) != 0
1590 && DECL_SAVED_INSNS (decl) != 0
1591 && (flag_keep_inline_functions
1592 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1593 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1596 output_inline_function (decl);
1601 output_something = 1;
1605 return output_something;
1608 /* Issue appropriate warnings for the global declarations in VEC (of
1609 which there are LEN). Output debugging information for them. */
1612 check_global_declarations (tree *vec, int len)
1617 for (i = 0; i < len; i++)
1621 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1622 && ! TREE_ASM_WRITTEN (decl))
1623 /* Cancel the RTL for this decl so that, if debugging info
1624 output for global variables is still to come,
1625 this one will be omitted. */
1626 SET_DECL_RTL (decl, NULL_RTX);
1628 /* Warn about any function
1629 declared static but not defined.
1630 We don't warn about variables,
1631 because many programs have static variables
1632 that exist only to get some text into the object file. */
1633 if (TREE_CODE (decl) == FUNCTION_DECL
1634 && (warn_unused_function
1635 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1636 && DECL_INITIAL (decl) == 0
1637 && DECL_EXTERNAL (decl)
1638 && ! DECL_ARTIFICIAL (decl)
1639 && ! TREE_PUBLIC (decl))
1641 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1642 pedwarn ("%H'%F' used but never defined",
1643 &DECL_SOURCE_LOCATION (decl), decl);
1645 warning ("%H'%F' declared `static' but never defined",
1646 &DECL_SOURCE_LOCATION (decl), decl);
1647 /* This symbol is effectively an "extern" declaration now. */
1648 TREE_PUBLIC (decl) = 1;
1649 assemble_external (decl);
1652 /* Warn about static fns or vars defined but not used. */
1653 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1654 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
1655 && ! TREE_USED (decl)
1656 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1657 to handle multiple external decls in different scopes. */
1658 && ! TREE_USED (DECL_NAME (decl))
1659 && ! DECL_EXTERNAL (decl)
1660 && ! TREE_PUBLIC (decl)
1661 /* A volatile variable might be used in some non-obvious way. */
1662 && ! TREE_THIS_VOLATILE (decl)
1663 /* Global register variables must be declared to reserve them. */
1664 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1665 /* Otherwise, ask the language. */
1666 && (*lang_hooks.decls.warn_unused_global) (decl))
1667 warning ("%H'%D' defined but not used",
1668 &DECL_SOURCE_LOCATION (decl), decl);
1670 /* Avoid confusing the debug information machinery when there are
1672 if (errorcount == 0 && sorrycount == 0)
1674 timevar_push (TV_SYMOUT);
1675 (*debug_hooks->global_decl) (decl);
1676 timevar_pop (TV_SYMOUT);
1681 /* Save the current INPUT_LOCATION on the top entry in the
1682 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1683 INPUT_LOCATION accordingly. */
1686 push_srcloc (const char *file, int line)
1688 struct file_stack *fs;
1690 fs = xmalloc (sizeof (struct file_stack));
1691 fs->location = input_location;
1692 fs->next = input_file_stack;
1693 input_filename = file;
1695 input_file_stack = fs;
1696 input_file_stack_tick++;
1699 /* Pop the top entry off the stack of presently open source files.
1700 Restore the INPUT_LOCATION from the new topmost entry on the
1706 struct file_stack *fs;
1708 fs = input_file_stack;
1709 input_location = fs->location;
1710 input_file_stack = fs->next;
1712 input_file_stack_tick++;
1715 /* Compile an entire translation unit. Write a file of assembly
1716 output and various debugging dumps. */
1721 /* Initialize yet another pass. */
1723 init_final (main_input_filename);
1724 coverage_init (aux_base_name);
1726 timevar_push (TV_PARSE);
1728 /* Call the parser, which parses the entire file (calling
1729 rest_of_compilation for each function). */
1730 (*lang_hooks.parse_file) (set_yydebug);
1732 /* In case there were missing block closers,
1733 get us back to the global binding level. */
1734 (*lang_hooks.clear_binding_stack) ();
1736 /* Compilation is now finished except for writing
1737 what's left of the symbol table output. */
1738 timevar_pop (TV_PARSE);
1740 if (flag_syntax_only)
1743 (*lang_hooks.decls.final_write_globals)();
1745 cgraph_varpool_assemble_pending_decls ();
1747 /* This must occur after the loop to output deferred functions.
1748 Else the coverage initializer would not be emitted if all the
1749 functions in this compilation unit were deferred. */
1752 /* Write out any pending weak symbol declarations. */
1756 /* Do dbx symbols. */
1757 timevar_push (TV_SYMOUT);
1759 #ifdef DWARF2_UNWIND_INFO
1760 if (dwarf2out_do_frame ())
1761 dwarf2out_frame_finish ();
1764 (*debug_hooks->finish) (main_input_filename);
1765 timevar_pop (TV_SYMOUT);
1767 /* Output some stuff at end of file if nec. */
1769 dw2_output_indirect_constants ();
1771 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
1773 timevar_push (TV_DUMP);
1774 open_dump_file (DFI_bp, NULL);
1778 close_dump_file (DFI_bp, NULL, NULL_RTX);
1779 timevar_pop (TV_DUMP);
1782 targetm.asm_out.file_end ();
1784 /* Attach a special .ident directive to the end of the file to identify
1785 the version of GCC which compiled this code. The format of the .ident
1786 string is patterned after the ones produced by native SVR4 compilers. */
1789 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1790 IDENT_ASM_OP, version_string);
1793 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
1795 timevar_push (TV_DUMP);
1796 dump_combine_total_stats (rtl_dump_file);
1797 close_dump_file (DFI_combine, NULL, NULL_RTX);
1798 timevar_pop (TV_DUMP);
1802 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
1803 and TYPE_DECL nodes.
1805 This does nothing for local (non-static) variables, unless the
1806 variable is a register variable with an ASMSPEC. In that case, or
1807 if the variable is not an automatic, it sets up the RTL and
1808 outputs any assembler code (label definition, storage allocation
1809 and initialization).
1811 DECL is the declaration. If ASMSPEC is nonzero, it specifies
1812 the assembler symbol name to be used. TOP_LEVEL is nonzero
1813 if this declaration is not within a function. */
1816 rest_of_decl_compilation (tree decl,
1817 const char *asmspec,
1821 /* We deferred calling assemble_alias so that we could collect
1822 other attributes such as visibility. Emit the alias now. */
1825 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
1828 alias = TREE_VALUE (TREE_VALUE (alias));
1829 alias = get_identifier (TREE_STRING_POINTER (alias));
1830 assemble_alias (decl, alias);
1834 /* Forward declarations for nested functions are not "external",
1835 but we need to treat them as if they were. */
1836 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
1837 || TREE_CODE (decl) == FUNCTION_DECL)
1839 timevar_push (TV_VARCONST);
1842 make_decl_rtl (decl, asmspec);
1844 /* Don't output anything when a tentative file-scope definition
1845 is seen. But at end of compilation, do output code for them. */
1846 if (at_end || !DECL_DEFER_OUTPUT (decl))
1848 if (flag_unit_at_a_time && !cgraph_global_info_ready
1849 && TREE_CODE (decl) != FUNCTION_DECL && top_level)
1850 cgraph_varpool_finalize_decl (decl);
1852 assemble_variable (decl, top_level, at_end, 0);
1855 #ifdef ASM_FINISH_DECLARE_OBJECT
1856 if (decl == last_assemble_variable_decl)
1858 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
1863 timevar_pop (TV_VARCONST);
1865 else if (DECL_REGISTER (decl) && asmspec != 0)
1867 if (decode_reg_name (asmspec) >= 0)
1869 SET_DECL_RTL (decl, NULL_RTX);
1870 make_decl_rtl (decl, asmspec);
1874 error ("invalid register name `%s' for register variable", asmspec);
1875 DECL_REGISTER (decl) = 0;
1880 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1881 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1882 && TREE_CODE (decl) == TYPE_DECL)
1884 timevar_push (TV_SYMOUT);
1885 dbxout_symbol (decl, 0);
1886 timevar_pop (TV_SYMOUT);
1889 #ifdef SDB_DEBUGGING_INFO
1890 else if (write_symbols == SDB_DEBUG && top_level
1891 && TREE_CODE (decl) == TYPE_DECL)
1893 timevar_push (TV_SYMOUT);
1894 sdbout_symbol (decl, 0);
1895 timevar_pop (TV_SYMOUT);
1898 #ifdef DWARF2_DEBUGGING_INFO
1899 else if ((write_symbols == DWARF2_DEBUG
1900 || write_symbols == VMS_AND_DWARF2_DEBUG)
1902 && TREE_CODE (decl) == TYPE_DECL)
1904 timevar_push (TV_SYMOUT);
1905 dwarf2out_decl (decl);
1906 timevar_pop (TV_SYMOUT);
1911 /* Called after finishing a record, union or enumeral type. */
1914 rest_of_type_compilation (
1915 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
1916 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
1920 tree type ATTRIBUTE_UNUSED,
1921 int toplev ATTRIBUTE_UNUSED
1925 /* Avoid confusing the debug information machinery when there are
1927 if (errorcount != 0 || sorrycount != 0)
1930 timevar_push (TV_SYMOUT);
1931 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
1932 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
1933 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
1935 #ifdef SDB_DEBUGGING_INFO
1936 if (write_symbols == SDB_DEBUG)
1937 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
1939 #ifdef DWARF2_DEBUGGING_INFO
1940 if ((write_symbols == DWARF2_DEBUG
1941 || write_symbols == VMS_AND_DWARF2_DEBUG)
1943 dwarf2out_decl (TYPE_STUB_DECL (type));
1945 timevar_pop (TV_SYMOUT);
1948 /* Turn the RTL into assembly. */
1950 rest_of_handle_final (tree decl, rtx insns)
1952 timevar_push (TV_FINAL);
1957 /* Get the function's name, as described by its RTL. This may be
1958 different from the DECL_NAME name used in the source file. */
1960 x = DECL_RTL (decl);
1961 if (GET_CODE (x) != MEM)
1964 if (GET_CODE (x) != SYMBOL_REF)
1966 fnname = XSTR (x, 0);
1968 assemble_start_function (decl, fnname);
1969 final_start_function (insns, asm_out_file, optimize);
1970 final (insns, asm_out_file, optimize, 0);
1971 final_end_function ();
1973 #ifdef IA64_UNWIND_INFO
1974 /* ??? The IA-64 ".handlerdata" directive must be issued before
1975 the ".endp" directive that closes the procedure descriptor. */
1976 output_function_exception_table ();
1979 assemble_end_function (decl, fnname);
1981 #ifndef IA64_UNWIND_INFO
1982 /* Otherwise, it feels unclean to switch sections in the middle. */
1983 output_function_exception_table ();
1987 fflush (asm_out_file);
1989 /* Release all memory allocated by flow. */
1990 free_basic_block_vars (0);
1992 /* Release all memory held by regsets now. */
1993 regset_release_memory ();
1995 timevar_pop (TV_FINAL);
2001 /* Run delay slot optimization. */
2003 rest_of_handle_delay_slots (tree decl, rtx insns)
2005 timevar_push (TV_DBR_SCHED);
2006 open_dump_file (DFI_dbr, decl);
2008 dbr_schedule (insns, rtl_dump_file);
2010 close_dump_file (DFI_dbr, print_rtl, insns);
2011 timevar_pop (TV_DBR_SCHED);
2018 /* Convert register usage from flat register file usage to a stack
2021 rest_of_handle_stack_regs (tree decl, rtx insns)
2023 timevar_push (TV_REG_STACK);
2024 open_dump_file (DFI_stack, decl);
2026 if (reg_to_stack (insns, rtl_dump_file) && optimize)
2028 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
2029 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
2030 && flag_reorder_blocks)
2032 reorder_basic_blocks ();
2033 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
2037 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
2038 timevar_pop (TV_REG_STACK);
2045 /* Machine independent reorg pass. */
2047 rest_of_handle_machine_reorg (tree decl, rtx insns)
2049 timevar_push (TV_MACH_DEP);
2050 open_dump_file (DFI_mach, decl);
2052 (*targetm.machine_dependent_reorg) ();
2054 close_dump_file (DFI_mach, print_rtl, insns);
2055 timevar_pop (TV_MACH_DEP);
2061 /* Run new register allocator. Return TRUE if we must exit
2062 rest_of_compilation upon return. */
2064 rest_of_handle_new_regalloc (tree decl, rtx insns, int *rebuild_notes)
2068 delete_trivially_dead_insns (insns, max_reg_num ());
2071 timevar_pop (TV_LOCAL_ALLOC);
2072 if (dump_file[DFI_lreg].enabled)
2074 timevar_push (TV_DUMP);
2076 close_dump_file (DFI_lreg, NULL, NULL);
2077 timevar_pop (TV_DUMP);
2080 /* XXX clean up the whole mess to bring live info in shape again. */
2081 timevar_push (TV_GLOBAL_ALLOC);
2082 open_dump_file (DFI_greg, decl);
2084 build_insn_chain (insns);
2085 failure = reload (insns, 0);
2087 timevar_pop (TV_GLOBAL_ALLOC);
2089 if (dump_file[DFI_greg].enabled)
2091 timevar_push (TV_DUMP);
2093 dump_global_regs (rtl_dump_file);
2095 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2096 timevar_pop (TV_DUMP);
2102 reload_completed = 1;
2108 /* Run old register allocator. Return TRUE if we must exit
2109 rest_of_compilation upon return. */
2111 rest_of_handle_old_regalloc (tree decl, rtx insns, int *rebuild_notes)
2115 /* Allocate the reg_renumber array. */
2116 allocate_reg_info (max_regno, FALSE, TRUE);
2118 /* And the reg_equiv_memory_loc array. */
2119 reg_equiv_memory_loc = xcalloc (max_regno, sizeof (rtx));
2121 allocate_initial_values (reg_equiv_memory_loc);
2123 regclass (insns, max_reg_num (), rtl_dump_file);
2124 *rebuild_notes = local_alloc ();
2126 timevar_pop (TV_LOCAL_ALLOC);
2128 if (dump_file[DFI_lreg].enabled)
2130 timevar_push (TV_DUMP);
2132 dump_flow_info (rtl_dump_file);
2133 dump_local_alloc (rtl_dump_file);
2135 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
2136 timevar_pop (TV_DUMP);
2141 timevar_push (TV_GLOBAL_ALLOC);
2142 open_dump_file (DFI_greg, decl);
2144 /* If optimizing, allocate remaining pseudo-regs. Do the reload
2145 pass fixing up any insns that are invalid. */
2148 failure = global_alloc (rtl_dump_file);
2151 build_insn_chain (insns);
2152 failure = reload (insns, 0);
2155 timevar_pop (TV_GLOBAL_ALLOC);
2157 if (dump_file[DFI_greg].enabled)
2159 timevar_push (TV_DUMP);
2161 dump_global_regs (rtl_dump_file);
2163 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
2164 timevar_pop (TV_DUMP);
2170 /* Run the regrename and cprop passes. */
2172 rest_of_handle_regrename (tree decl, rtx insns)
2174 timevar_push (TV_RENAME_REGISTERS);
2175 open_dump_file (DFI_rnreg, decl);
2177 if (flag_rename_registers)
2178 regrename_optimize ();
2179 if (flag_cprop_registers)
2180 copyprop_hardreg_forward ();
2182 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
2183 timevar_pop (TV_RENAME_REGISTERS);
2186 /* Reorder basic blocks. */
2188 rest_of_handle_reorder_blocks (tree decl, rtx insns)
2190 timevar_push (TV_REORDER_BLOCKS);
2191 open_dump_file (DFI_bbro, decl);
2193 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
2194 splitting possibly introduced more crossjumping opportunities. */
2195 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
2196 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
2198 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
2200 if (flag_reorder_blocks)
2201 reorder_basic_blocks ();
2202 if (flag_reorder_blocks
2203 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
2204 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2206 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
2207 timevar_pop (TV_REORDER_BLOCKS);
2210 #ifdef INSN_SCHEDULING
2211 /* Run instruction scheduler. */
2213 rest_of_handle_sched (tree decl, rtx insns)
2215 timevar_push (TV_SCHED);
2217 /* Print function header into sched dump now
2218 because doing the sched analysis makes some of the dump. */
2219 if (optimize > 0 && flag_schedule_insns)
2221 open_dump_file (DFI_sched, decl);
2223 /* Do control and data sched analysis,
2224 and write some of the results to dump file. */
2226 schedule_insns (rtl_dump_file);
2228 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
2230 timevar_pop (TV_SCHED);
2235 /* Run second scheduling pass after reload. */
2237 rest_of_handle_sched2 (tree decl, rtx insns)
2239 timevar_push (TV_SCHED2);
2240 open_dump_file (DFI_sched2, decl);
2242 /* Do control and data sched analysis again,
2243 and write some more of the results to dump file. */
2245 split_all_insns (1);
2247 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
2249 schedule_ebbs (rtl_dump_file);
2250 /* No liveness updating code yet, but it should be easy to do.
2251 reg-stack recompute the liveness when needed for now. */
2252 count_or_remove_death_notes (NULL, 1);
2253 cleanup_cfg (CLEANUP_EXPENSIVE);
2256 schedule_insns (rtl_dump_file);
2258 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
2259 timevar_pop (TV_SCHED2);
2265 /* Register allocation pre-pass, to reduce number of moves necessary
2266 for two-address machines. */
2268 rest_of_handle_regmove (tree decl, rtx insns)
2270 timevar_push (TV_REGMOVE);
2271 open_dump_file (DFI_regmove, decl);
2273 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
2275 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2276 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
2277 timevar_pop (TV_REGMOVE);
2284 rest_of_handle_tracer (tree decl, rtx insns)
2286 timevar_push (TV_TRACER);
2287 open_dump_file (DFI_tracer, decl);
2289 dump_flow_info (rtl_dump_file);
2291 cleanup_cfg (CLEANUP_EXPENSIVE);
2292 reg_scan (insns, max_reg_num (), 0);
2293 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2294 timevar_pop (TV_TRACER);
2297 /* If-conversion and CFG cleanup. */
2299 rest_of_handle_if_conversion (tree decl, rtx insns)
2301 open_dump_file (DFI_ce1, decl);
2302 if (flag_if_conversion)
2304 timevar_push (TV_IFCVT);
2306 dump_flow_info (rtl_dump_file);
2307 cleanup_cfg (CLEANUP_EXPENSIVE);
2308 reg_scan (insns, max_reg_num (), 0);
2310 timevar_pop (TV_IFCVT);
2312 timevar_push (TV_JUMP);
2313 cleanup_cfg (CLEANUP_EXPENSIVE);
2314 reg_scan (insns, max_reg_num (), 0);
2315 timevar_pop (TV_JUMP);
2316 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
2319 /* Rerun if-conversion, as combine may have simplified things enough
2320 to now meet sequence length restrictions. */
2322 rest_of_handle_if_after_combine (tree decl, rtx insns)
2324 timevar_push (TV_IFCVT);
2325 open_dump_file (DFI_ce2, decl);
2331 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
2332 timevar_pop (TV_IFCVT);
2335 /* Do branch profiling and static profile estimation passes. */
2337 rest_of_handle_branch_prob (tree decl, rtx insns)
2341 timevar_push (TV_BRANCH_PROB);
2342 open_dump_file (DFI_bp, decl);
2343 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2346 /* Discover and record the loop depth at the head of each basic
2347 block. The loop infrastructure does the real job for us. */
2348 flow_loops_find (&loops, LOOP_TREE);
2351 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2353 /* Estimate using heuristics if no profiling info is available. */
2354 if (flag_guess_branch_prob)
2355 estimate_probability (&loops);
2357 flow_loops_free (&loops);
2358 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2359 timevar_pop (TV_BRANCH_PROB);
2362 /* Do control and data flow analysis; write some of the results to the
2365 rest_of_handle_cfg (tree decl, rtx insns)
2367 open_dump_file (DFI_cfg, decl);
2369 dump_flow_info (rtl_dump_file);
2371 cleanup_cfg (CLEANUP_EXPENSIVE
2372 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2374 /* It may make more sense to mark constant functions after dead code is
2375 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
2376 may insert code making function non-constant, but we still must consider
2377 it as constant, otherwise -fbranch-probabilities will not read data back.
2379 life_analysis rarely eliminates modification of external memory.
2382 mark_constant_function ();
2384 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2387 /* Purge addressofs. */
2389 rest_of_handle_addressof (tree decl, rtx insns)
2391 open_dump_file (DFI_addressof, decl);
2393 purge_addressof (insns);
2394 if (optimize && purge_all_dead_edges (0))
2395 delete_unreachable_blocks ();
2396 reg_scan (insns, max_reg_num (), 1);
2398 close_dump_file (DFI_addressof, print_rtl, insns);
2401 /* We may have potential sibling or tail recursion sites. Select one
2402 (of possibly multiple) methods of performing the call. */
2404 rest_of_handle_sibling_calls (rtx insns)
2407 optimize_sibling_and_tail_recursive_calls ();
2409 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2410 free_bb_for_insn ();
2411 find_exception_handler_labels ();
2412 rebuild_jump_labels (insns);
2413 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2415 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2416 notes before simplifying cfg and we must do lowering after sibcall
2417 that unhides parts of RTL chain and cleans up the CFG.
2419 Until sibcall is replaced by tree-level optimizer, lets just
2420 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2421 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2422 if (GET_CODE (insn) == NOTE
2423 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2426 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2429 /* Perform jump bypassing and control flow optimizations. */
2431 rest_of_handle_jump_bypass (tree decl, rtx insns)
2433 timevar_push (TV_BYPASS);
2434 open_dump_file (DFI_bypass, decl);
2436 cleanup_cfg (CLEANUP_EXPENSIVE);
2438 if (bypass_jumps (rtl_dump_file))
2440 rebuild_jump_labels (insns);
2441 cleanup_cfg (CLEANUP_EXPENSIVE);
2442 delete_trivially_dead_insns (insns, max_reg_num ());
2445 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
2446 timevar_pop (TV_BYPASS);
2450 #ifdef ENABLE_CHECKING
2451 verify_flow_info ();
2455 /* Handle inlining of functions in rest_of_compilation. Return TRUE
2456 if we must exit rest_of_compilation upon return. */
2458 rest_of_handle_inlining (tree decl)
2465 /* If we are reconsidering an inline function at the end of
2466 compilation, skip the stuff for making it inline. */
2467 if (DECL_SAVED_INSNS (decl) != 0)
2470 /* If this is nested inside an inlined external function, pretend
2471 it was only declared. Since we cannot inline such functions,
2472 generating code for this one is not only not necessary but will
2473 confuse some debugging output writers. */
2474 for (parent = DECL_CONTEXT (current_function_decl);
2475 parent != NULL_TREE;
2476 parent = get_containing_scope (parent))
2477 if (TREE_CODE (parent) == FUNCTION_DECL
2478 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2480 DECL_INITIAL (decl) = 0;
2483 else if (TYPE_P (parent))
2484 /* A function in a local class should be treated normally. */
2487 /* If requested, consider whether to make this function inline. */
2488 if ((DECL_INLINE (decl) && !flag_no_inline)
2489 || flag_inline_functions)
2491 timevar_push (TV_INTEGRATION);
2492 lose = function_cannot_inline_p (decl);
2493 timevar_pop (TV_INTEGRATION);
2494 if (lose || ! optimize)
2496 if (warn_inline && lose && DECL_INLINE (decl))
2498 char *msg = xmalloc (2 + strlen (lose) + 1);
2501 strcpy(msg + 2, lose);
2502 warning (msg, &DECL_SOURCE_LOCATION (decl));
2505 DECL_ABSTRACT_ORIGIN (decl) = 0;
2506 /* Don't really compile an extern inline function.
2507 If we can't make it inline, pretend
2508 it was only declared. */
2509 if (DECL_EXTERNAL (decl))
2511 DECL_INITIAL (decl) = 0;
2516 inlinable = DECL_INLINE (decl) = 1;
2519 insns = get_insns ();
2521 /* Dump the rtl code if we are dumping rtl. */
2523 if (open_dump_file (DFI_rtl, decl))
2525 if (DECL_SAVED_INSNS (decl))
2526 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2527 close_dump_file (DFI_rtl, print_rtl, insns);
2530 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2531 sorts of eh initialization. Delay this until after the
2532 initial rtl dump so that we can see the original nesting. */
2533 convert_from_eh_region_ranges ();
2535 /* If function is inline, and we don't yet know whether to
2536 compile it by itself, defer decision till end of compilation.
2537 wrapup_global_declarations will (indirectly) call
2538 rest_of_compilation again for those functions that need to
2539 be output. Also defer those functions that we are supposed
2543 || (DECL_INLINE (decl)
2544 && flag_inline_functions
2545 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2546 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2547 && ! flag_keep_inline_functions)
2548 || DECL_EXTERNAL (decl))))
2549 DECL_DEFER_OUTPUT (decl) = 1;
2551 if (DECL_INLINE (decl))
2552 /* DWARF wants separate debugging info for abstract and
2553 concrete instances of all inline functions, including those
2554 declared inline but not inlined, and those inlined even
2555 though they weren't declared inline. Conveniently, that's
2556 what DECL_INLINE means at this point. */
2557 (*debug_hooks->deferred_inline_function) (decl);
2559 if (DECL_DEFER_OUTPUT (decl))
2561 /* If -Wreturn-type, we have to do a bit of compilation. We just
2562 want to call cleanup the cfg to figure out whether or not we can
2563 fall off the end of the function; we do the minimum amount of
2564 work necessary to make that safe. */
2565 if (warn_return_type)
2567 int saved_optimize = optimize;
2570 rebuild_jump_labels (insns);
2571 find_exception_handler_labels ();
2572 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2573 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2574 optimize = saved_optimize;
2576 /* CFG is no longer maintained up-to-date. */
2577 free_bb_for_insn ();
2580 set_nothrow_function_flags ();
2581 if (current_function_nothrow)
2582 /* Now we know that this can't throw; set the flag for the benefit
2583 of other functions later in this translation unit. */
2584 TREE_NOTHROW (current_function_decl) = 1;
2586 timevar_push (TV_INTEGRATION);
2587 save_for_inline (decl);
2588 timevar_pop (TV_INTEGRATION);
2589 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2593 /* If specified extern inline but we aren't inlining it, we are
2594 done. This goes for anything that gets here with DECL_EXTERNAL
2595 set, not just things with DECL_INLINE. */
2596 return (bool) DECL_EXTERNAL (decl);
2599 /* Rest of compilation helper to convert the rtl to SSA form. */
2601 rest_of_handle_ssa (tree decl, rtx insns)
2603 timevar_push (TV_TO_SSA);
2604 open_dump_file (DFI_ssa, decl);
2606 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2609 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2610 timevar_pop (TV_TO_SSA);
2612 /* Perform sparse conditional constant propagation, if requested. */
2615 timevar_push (TV_SSA_CCP);
2616 open_dump_file (DFI_ssa_ccp, decl);
2620 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2621 timevar_pop (TV_SSA_CCP);
2624 /* It would be useful to cleanup the CFG at this point, but block
2625 merging and possibly other transformations might leave a PHI
2626 node in the middle of a basic block, which is a strict no-no. */
2628 /* The SSA implementation uses basic block numbers in its phi
2629 nodes. Thus, changing the control-flow graph or the basic
2630 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2631 may cause problems. */
2635 /* Remove dead code. */
2637 timevar_push (TV_SSA_DCE);
2638 open_dump_file (DFI_ssa_dce, decl);
2640 insns = get_insns ();
2641 ssa_eliminate_dead_code ();
2643 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2644 timevar_pop (TV_SSA_DCE);
2647 /* Convert from SSA form. */
2649 timevar_push (TV_FROM_SSA);
2650 open_dump_file (DFI_ussa, decl);
2652 convert_from_ssa ();
2653 /* New registers have been created. Rescan their usage. */
2654 reg_scan (insns, max_reg_num (), 1);
2656 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2657 timevar_pop (TV_FROM_SSA);
2664 /* Try to identify useless null pointer tests and delete them. */
2666 rest_of_handle_null_pointer (tree decl, rtx insns)
2668 open_dump_file (DFI_null, decl);
2670 dump_flow_info (rtl_dump_file);
2672 if (delete_null_pointer_checks (insns))
2673 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2675 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2678 /* Try combining insns through substitution. */
2680 rest_of_handle_combine (tree decl, rtx insns)
2682 int rebuild_jump_labels_after_combine = 0;
2684 timevar_push (TV_COMBINE);
2685 open_dump_file (DFI_combine, decl);
2687 rebuild_jump_labels_after_combine
2688 = combine_instructions (insns, max_reg_num ());
2690 /* Combining insns may have turned an indirect jump into a
2691 direct jump. Rebuild the JUMP_LABEL fields of jumping
2693 if (rebuild_jump_labels_after_combine)
2695 timevar_push (TV_JUMP);
2696 rebuild_jump_labels (insns);
2697 timevar_pop (TV_JUMP);
2699 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
2702 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
2703 timevar_pop (TV_COMBINE);
2708 /* Perform life analysis. */
2710 rest_of_handle_life (tree decl, rtx insns)
2712 open_dump_file (DFI_life, decl);
2715 #ifdef ENABLE_CHECKING
2716 verify_flow_info ();
2718 life_analysis (insns, rtl_dump_file, PROP_FINAL);
2720 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
2721 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2722 timevar_pop (TV_FLOW);
2724 if (warn_uninitialized)
2726 uninitialized_vars_warning (DECL_INITIAL (decl));
2728 setjmp_args_warning ();
2733 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
2735 /* Insns were inserted, and possibly pseudos created, so
2736 things might look a bit different. */
2737 insns = get_insns ();
2738 allocate_reg_life_data ();
2739 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
2740 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
2746 close_dump_file (DFI_life, print_rtl_with_bb, insns);
2751 /* Perform common subexpression elimination. Nonzero value from
2752 `cse_main' means that jumps were simplified and some code may now
2753 be unreachable, so do jump optimization again. */
2755 rest_of_handle_cse (tree decl, rtx insns)
2759 open_dump_file (DFI_cse, decl);
2761 dump_flow_info (rtl_dump_file);
2762 timevar_push (TV_CSE);
2764 reg_scan (insns, max_reg_num (), 1);
2766 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2768 rebuild_jump_labels (insns);
2769 purge_all_dead_edges (0);
2771 delete_trivially_dead_insns (insns, max_reg_num ());
2773 /* If we are not running more CSE passes, then we are no longer
2774 expecting CSE to be run. But always rerun it in a cheap mode. */
2775 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2777 if (tem || optimize > 1)
2778 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2779 /* Try to identify useless null pointer tests and delete them. */
2780 if (flag_delete_null_pointer_checks)
2782 timevar_push (TV_JUMP);
2784 if (delete_null_pointer_checks (insns))
2785 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2786 timevar_pop (TV_JUMP);
2789 /* The second pass of jump optimization is likely to have
2790 removed a bunch more instructions. */
2791 renumber_insns (rtl_dump_file);
2793 timevar_pop (TV_CSE);
2794 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2797 /* Run second CSE pass after loop optimizations. */
2799 rest_of_handle_cse2 (tree decl, rtx insns)
2803 timevar_push (TV_CSE2);
2804 open_dump_file (DFI_cse2, decl);
2806 dump_flow_info (rtl_dump_file);
2807 /* CFG is no longer maintained up-to-date. */
2808 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2809 purge_all_dead_edges (0);
2810 delete_trivially_dead_insns (insns, max_reg_num ());
2814 timevar_push (TV_JUMP);
2815 rebuild_jump_labels (insns);
2816 cleanup_cfg (CLEANUP_EXPENSIVE);
2817 timevar_pop (TV_JUMP);
2819 reg_scan (insns, max_reg_num (), 0);
2820 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2822 timevar_pop (TV_CSE2);
2825 /* Perform global cse. */
2827 rest_of_handle_gcse (tree decl, rtx insns)
2829 int save_csb, save_cfj;
2832 timevar_push (TV_GCSE);
2833 open_dump_file (DFI_gcse, decl);
2835 tem = gcse_main (insns, rtl_dump_file);
2836 rebuild_jump_labels (insns);
2837 delete_trivially_dead_insns (insns, max_reg_num ());
2839 save_csb = flag_cse_skip_blocks;
2840 save_cfj = flag_cse_follow_jumps;
2841 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2843 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2844 if (current_function_calls_constant_p)
2845 purge_builtin_constant_p ();
2847 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2849 if (flag_expensive_optimizations)
2851 timevar_push (TV_CSE);
2852 reg_scan (insns, max_reg_num (), 1);
2853 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2854 purge_all_dead_edges (0);
2855 delete_trivially_dead_insns (insns, max_reg_num ());
2856 timevar_pop (TV_CSE);
2857 cse_not_expected = !flag_rerun_cse_after_loop;
2860 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2861 things up. Then possibly re-run CSE again. */
2865 timevar_push (TV_JUMP);
2866 rebuild_jump_labels (insns);
2867 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2868 timevar_pop (TV_JUMP);
2870 if (flag_expensive_optimizations)
2872 timevar_push (TV_CSE);
2873 reg_scan (insns, max_reg_num (), 1);
2874 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2875 purge_all_dead_edges (0);
2876 delete_trivially_dead_insns (insns, max_reg_num ());
2877 timevar_pop (TV_CSE);
2881 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2882 timevar_pop (TV_GCSE);
2885 flag_cse_skip_blocks = save_csb;
2886 flag_cse_follow_jumps = save_cfj;
2887 #ifdef ENABLE_CHECKING
2888 verify_flow_info ();
2892 /* Move constant computations out of loops. */
2894 rest_of_handle_loop_optimize (tree decl, rtx insns)
2896 int do_unroll, do_prefetch;
2898 timevar_push (TV_LOOP);
2899 delete_dead_jumptables ();
2900 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2901 open_dump_file (DFI_loop, decl);
2903 /* CFG is no longer maintained up-to-date. */
2904 free_bb_for_insn ();
2906 if (flag_unroll_loops)
2907 do_unroll = 0; /* Having two unrollers is useless. */
2909 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
2910 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
2912 if (flag_rerun_loop_opt)
2914 cleanup_barriers ();
2916 /* We only want to perform unrolling once. */
2917 loop_optimize (insns, rtl_dump_file, do_unroll);
2920 /* The first call to loop_optimize makes some instructions
2921 trivially dead. We delete those instructions now in the
2922 hope that doing so will make the heuristics in loop work
2923 better and possibly speed up compilation. */
2924 delete_trivially_dead_insns (insns, max_reg_num ());
2926 /* The regscan pass is currently necessary as the alias
2927 analysis code depends on this information. */
2928 reg_scan (insns, max_reg_num (), 1);
2930 cleanup_barriers ();
2931 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
2933 /* Loop can create trivially dead instructions. */
2934 delete_trivially_dead_insns (insns, max_reg_num ());
2935 close_dump_file (DFI_loop, print_rtl, insns);
2936 timevar_pop (TV_LOOP);
2937 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2942 /* Perform loop optimizations. It might be better to do them a bit
2943 sooner, but we want the profile feedback to work more
2946 rest_of_handle_loop2 (tree decl, rtx insns)
2948 struct loops *loops;
2949 timevar_push (TV_LOOP);
2950 open_dump_file (DFI_loop2, decl);
2952 dump_flow_info (rtl_dump_file);
2954 loops = loop_optimizer_init (rtl_dump_file);
2958 /* The optimizations: */
2959 if (flag_unswitch_loops)
2960 unswitch_loops (loops);
2962 if (flag_peel_loops || flag_unroll_loops)
2963 unroll_and_peel_loops (loops,
2964 (flag_peel_loops ? UAP_PEEL : 0) |
2965 (flag_unroll_loops ? UAP_UNROLL : 0) |
2966 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
2968 loop_optimizer_finalize (loops, rtl_dump_file);
2971 cleanup_cfg (CLEANUP_EXPENSIVE);
2972 delete_trivially_dead_insns (insns, max_reg_num ());
2973 reg_scan (insns, max_reg_num (), 0);
2975 dump_flow_info (rtl_dump_file);
2976 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
2977 timevar_pop (TV_LOOP);
2981 /* This is called from finish_function (within langhooks.parse_file)
2982 after each top-level definition is parsed.
2983 It is supposed to compile that function or variable
2984 and output the assembler code for it.
2985 After we return, the tree storage is freed. */
2988 rest_of_compilation (tree decl)
2991 int rebuild_label_notes_after_reload;
2993 timevar_push (TV_REST_OF_COMPILATION);
2995 /* Register rtl specific functions for cfg. */
2996 rtl_register_cfg_hooks ();
2998 /* Now that we're out of the frontend, we shouldn't have any more
2999 CONCATs anywhere. */
3000 generating_concat_p = 0;
3002 /* When processing delayed functions, prepare_function_start() won't
3003 have been run to re-initialize it. */
3004 cse_not_expected = ! optimize;
3006 /* First, make sure that NOTE_BLOCK is set correctly for each
3007 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
3008 if (!cfun->x_whole_function_mode_p)
3011 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
3012 tree in sensible shape. So, we just recalculate it here. */
3013 if (cfun->x_whole_function_mode_p)
3018 if (rest_of_handle_inlining (decl))
3019 goto exit_rest_of_compilation;
3021 /* If we're emitting a nested function, make sure its parent gets
3022 emitted as well. Doing otherwise confuses debug info. */
3025 for (parent = DECL_CONTEXT (current_function_decl);
3026 parent != NULL_TREE;
3027 parent = get_containing_scope (parent))
3028 if (TREE_CODE (parent) == FUNCTION_DECL)
3029 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
3032 /* We are now committed to emitting code for this function. Do any
3033 preparation, such as emitting abstract debug info for the inline
3034 before it gets mangled by optimization. */
3035 if (DECL_INLINE (decl))
3036 (*debug_hooks->outlining_inline_function) (decl);
3038 /* Remove any notes we don't need. That will make iterating
3039 over the instruction sequence faster, and allow the garbage
3040 collector to reclaim the memory used by the notes. */
3041 remove_unnecessary_notes ();
3046 /* Initialize some variables used by the optimizers. */
3047 init_function_for_compilation ();
3049 if (! DECL_DEFER_OUTPUT (decl))
3050 TREE_ASM_WRITTEN (decl) = 1;
3052 /* Now that integrate will no longer see our rtl, we need not
3053 distinguish between the return value of this function and the
3054 return value of called functions. Also, we can remove all SETs
3055 of subregs of hard registers; they are only here because of
3056 integrate. Also, we can now initialize pseudos intended to
3057 carry magic hard reg data throughout the function. */
3058 rtx_equal_function_value_matters = 0;
3059 purge_hard_subreg_sets (get_insns ());
3061 /* Early return if there were errors. We can run afoul of our
3062 consistency checks, and there's not really much point in fixing them.
3063 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
3064 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
3065 || errorcount || sorrycount)
3066 goto exit_rest_of_compilation;
3068 timevar_push (TV_JUMP);
3069 open_dump_file (DFI_sibling, decl);
3070 insns = get_insns ();
3071 rebuild_jump_labels (insns);
3072 find_exception_handler_labels ();
3073 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3075 delete_unreachable_blocks ();
3077 /* We have to issue these warnings now already, because CFG cleanups
3078 further down may destroy the required information. */
3079 check_function_return_warnings ();
3081 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
3082 if (flag_guess_branch_prob)
3084 timevar_push (TV_BRANCH_PROB);
3085 note_prediction_to_br_prob ();
3086 timevar_pop (TV_BRANCH_PROB);
3089 if (flag_optimize_sibling_calls)
3090 rest_of_handle_sibling_calls (insns);
3092 timevar_pop (TV_JUMP);
3094 insn_locators_initialize ();
3095 /* Complete generation of exception handling code. */
3098 timevar_push (TV_JUMP);
3099 open_dump_file (DFI_eh, decl);
3101 finish_eh_generation ();
3103 close_dump_file (DFI_eh, print_rtl, get_insns ());
3104 timevar_pop (TV_JUMP);
3107 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
3108 generation, which might create new sets. */
3109 emit_initial_value_sets ();
3112 /* If we are doing position-independent code generation, now
3113 is the time to output special prologues and epilogues.
3114 We do not want to do this earlier, because it just clutters
3115 up inline functions with meaningless insns. */
3120 insns = get_insns ();
3122 /* Copy any shared structure that should not be shared. */
3123 unshare_all_rtl (current_function_decl, insns);
3125 #ifdef SETJMP_VIA_SAVE_AREA
3126 /* This must be performed before virtual register instantiation.
3127 Please be aware the everything in the compiler that can look
3128 at the RTL up to this point must understand that REG_SAVE_AREA
3129 is just like a use of the REG contained inside. */
3130 if (current_function_calls_alloca)
3131 optimize_save_area_alloca (insns);
3134 /* Instantiate all virtual registers. */
3135 instantiate_virtual_regs (current_function_decl, insns);
3137 open_dump_file (DFI_jump, decl);
3139 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
3140 are initialized and to compute whether control can drop off the end
3143 timevar_push (TV_JUMP);
3144 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
3145 before jump optimization switches branch directions. */
3146 if (flag_guess_branch_prob)
3147 expected_value_to_br_prob ();
3149 reg_scan (insns, max_reg_num (), 0);
3150 rebuild_jump_labels (insns);
3151 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3152 delete_trivially_dead_insns (insns, max_reg_num ());
3154 dump_flow_info (rtl_dump_file);
3155 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
3156 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3160 free_bb_for_insn ();
3161 copy_loop_headers (insns);
3162 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3164 purge_line_number_notes (insns);
3166 timevar_pop (TV_JUMP);
3167 close_dump_file (DFI_jump, print_rtl, insns);
3169 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
3170 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
3171 goto exit_rest_of_compilation;
3173 /* Long term, this should probably move before the jump optimizer too,
3174 but I didn't want to disturb the rtl_dump_and_exit and related
3175 stuff at this time. */
3176 if (optimize > 0 && flag_ssa)
3177 insns = rest_of_handle_ssa (decl, insns);
3179 timevar_push (TV_JUMP);
3182 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3184 if (flag_delete_null_pointer_checks)
3185 rest_of_handle_null_pointer (decl, insns);
3187 /* Jump optimization, and the removal of NULL pointer checks, may
3188 have reduced the number of instructions substantially. CSE, and
3189 future passes, allocate arrays whose dimensions involve the
3190 maximum instruction UID, so if we can reduce the maximum UID
3191 we'll save big on memory. */
3192 renumber_insns (rtl_dump_file);
3193 timevar_pop (TV_JUMP);
3195 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
3200 rest_of_handle_cse (decl, insns);
3202 rest_of_handle_addressof (decl, insns);
3209 rest_of_handle_gcse (decl, insns);
3211 if (flag_loop_optimize)
3212 rest_of_handle_loop_optimize (decl, insns);
3215 rest_of_handle_jump_bypass (decl, insns);
3218 timevar_push (TV_FLOW);
3220 rest_of_handle_cfg (decl, insns);
3223 || profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3224 rest_of_handle_branch_prob (decl, insns);
3227 rest_of_handle_if_conversion (decl, insns);
3230 rest_of_handle_tracer (decl, insns);
3233 && (flag_unswitch_loops
3235 || flag_unroll_loops))
3236 rest_of_handle_loop2 (decl, insns);
3238 if (flag_rerun_cse_after_loop)
3239 rest_of_handle_cse2 (decl, insns);
3241 cse_not_expected = 1;
3243 rest_of_handle_life (decl, insns);
3246 rest_of_handle_combine (decl, insns);
3248 if (flag_if_conversion)
3249 rest_of_handle_if_after_combine (decl, insns);
3251 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3252 rest_of_handle_regmove (decl, insns);
3254 /* Do unconditional splitting before register allocation to allow machine
3255 description to add extra information not needed previously. */
3256 split_all_insns (1);
3258 #ifdef OPTIMIZE_MODE_SWITCHING
3259 timevar_push (TV_MODE_SWITCH);
3262 optimize_mode_switching (NULL);
3265 timevar_pop (TV_MODE_SWITCH);
3268 /* Any of the several passes since flow1 will have munged register
3269 lifetime data a bit. We need it to be up to date for scheduling
3270 (see handling of reg_known_equiv in init_alias_analysis). */
3271 recompute_reg_usage (insns, !optimize_size);
3273 #ifdef INSN_SCHEDULING
3274 rest_of_handle_sched (decl, insns);
3277 /* Determine if the current function is a leaf before running reload
3278 since this can impact optimizations done by the prologue and
3279 epilogue thus changing register elimination offsets. */
3280 current_function_is_leaf = leaf_function_p ();
3282 timevar_push (TV_LOCAL_ALLOC);
3283 open_dump_file (DFI_lreg, decl);
3285 if (flag_new_regalloc)
3287 if (rest_of_handle_new_regalloc (decl, insns,
3288 &rebuild_label_notes_after_reload))
3289 goto exit_rest_of_compilation;
3293 if (rest_of_handle_old_regalloc (decl, insns,
3294 &rebuild_label_notes_after_reload))
3295 goto exit_rest_of_compilation;
3300 open_dump_file (DFI_postreload, decl);
3302 /* Do a very simple CSE pass over just the hard registers. */
3305 timevar_push (TV_RELOAD_CSE_REGS);
3306 reload_cse_regs (insns);
3307 timevar_pop (TV_RELOAD_CSE_REGS);
3310 /* Register allocation and reloading may have turned an indirect jump into
3311 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3312 jumping instructions. */
3313 if (rebuild_label_notes_after_reload)
3315 timevar_push (TV_JUMP);
3317 rebuild_jump_labels (insns);
3318 purge_all_dead_edges (0);
3320 timevar_pop (TV_JUMP);
3323 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3325 /* Re-create the death notes which were deleted during reload. */
3326 timevar_push (TV_FLOW2);
3327 open_dump_file (DFI_flow2, decl);
3329 #ifdef ENABLE_CHECKING
3330 verify_flow_info ();
3333 /* If optimizing, then go ahead and split insns now. */
3337 split_all_insns (0);
3339 if (flag_branch_target_load_optimize)
3341 open_dump_file (DFI_branch_target_load, decl);
3343 branch_target_load_optimize (insns, false);
3345 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3351 cleanup_cfg (CLEANUP_EXPENSIVE);
3353 /* On some machines, the prologue and epilogue code, or parts thereof,
3354 can be represented as RTL. Doing so lets us schedule insns between
3355 it and the rest of the code and also allows delayed branch
3356 scheduling to operate in the epilogue. */
3357 thread_prologue_and_epilogue_insns (insns);
3358 epilogue_completed = 1;
3362 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3363 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3364 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3366 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3367 even for machines with possibly nonzero RETURN_POPS_ARGS
3368 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3369 push instructions will have popping returns. */
3370 #ifndef PUSH_ROUNDING
3371 if (!ACCUMULATE_OUTGOING_ARGS)
3373 combine_stack_adjustments ();
3378 flow2_completed = 1;
3380 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3381 timevar_pop (TV_FLOW2);
3383 #ifdef HAVE_peephole2
3384 if (optimize > 0 && flag_peephole2)
3386 timevar_push (TV_PEEPHOLE2);
3387 open_dump_file (DFI_peephole2, decl);
3389 peephole2_optimize (rtl_dump_file);
3391 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3392 timevar_pop (TV_PEEPHOLE2);
3398 if (flag_rename_registers || flag_cprop_registers)
3399 rest_of_handle_regrename (decl, insns);
3401 rest_of_handle_reorder_blocks (decl, insns);
3404 if (flag_if_conversion2)
3406 timevar_push (TV_IFCVT2);
3407 open_dump_file (DFI_ce3, decl);
3411 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3412 timevar_pop (TV_IFCVT2);
3415 if (flag_branch_target_load_optimize2)
3417 /* Leave this a warning for now so that it is possible to experiment
3418 with running this pass twice. In 3.6, we should either make this
3419 an error, or use separate dump files. */
3420 if (flag_branch_target_load_optimize)
3421 warning ("branch target register load optimization is not intended "
3424 open_dump_file (DFI_branch_target_load, decl);
3426 branch_target_load_optimize (insns, true);
3428 close_dump_file (DFI_branch_target_load, print_rtl_with_bb, insns);
3433 #ifdef INSN_SCHEDULING
3434 if (optimize > 0 && flag_schedule_insns_after_reload)
3435 rest_of_handle_sched2 (decl, insns);
3438 #ifdef LEAF_REGISTERS
3439 current_function_uses_only_leaf_regs
3440 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3444 rest_of_handle_stack_regs (decl, insns);
3447 compute_alignments ();
3449 /* CFG is no longer maintained up-to-date. */
3450 free_bb_for_insn ();
3452 if (targetm.machine_dependent_reorg != 0)
3453 rest_of_handle_machine_reorg (decl, insns);
3455 purge_line_number_notes (insns);
3456 cleanup_barriers ();
3459 if (optimize > 0 && flag_delayed_branch)
3460 rest_of_handle_delay_slots (decl, insns);
3463 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3464 timevar_push (TV_SHORTEN_BRANCH);
3465 split_all_insns_noflow ();
3466 timevar_pop (TV_SHORTEN_BRANCH);
3469 convert_to_eh_region_ranges ();
3471 /* Shorten branches. */
3472 timevar_push (TV_SHORTEN_BRANCH);
3473 shorten_branches (get_insns ());
3474 timevar_pop (TV_SHORTEN_BRANCH);
3476 set_nothrow_function_flags ();
3477 if (current_function_nothrow)
3478 /* Now we know that this can't throw; set the flag for the benefit
3479 of other functions later in this translation unit. */
3480 TREE_NOTHROW (current_function_decl) = 1;
3482 rest_of_handle_final (decl, insns);
3484 /* Write DBX symbols if requested. */
3486 /* Note that for those inline functions where we don't initially
3487 know for certain that we will be generating an out-of-line copy,
3488 the first invocation of this routine (rest_of_compilation) will
3489 skip over this code by doing a `goto exit_rest_of_compilation;'.
3490 Later on, wrapup_global_declarations will (indirectly) call
3491 rest_of_compilation again for those inline functions that need
3492 to have out-of-line copies generated. During that call, we
3493 *will* be routed past here. */
3495 timevar_push (TV_SYMOUT);
3496 (*debug_hooks->function_decl) (decl);
3497 timevar_pop (TV_SYMOUT);
3499 exit_rest_of_compilation:
3501 coverage_end_function ();
3503 /* In case the function was not output,
3504 don't leave any temporary anonymous types
3505 queued up for sdb output. */
3506 #ifdef SDB_DEBUGGING_INFO
3507 if (write_symbols == SDB_DEBUG)
3508 sdbout_types (NULL_TREE);
3511 reload_completed = 0;
3512 epilogue_completed = 0;
3513 flow2_completed = 0;
3516 timevar_push (TV_FINAL);
3518 /* Clear out the insn_length contents now that they are no
3520 init_insn_lengths ();
3522 /* Show no temporary slots allocated. */
3525 free_basic_block_vars (0);
3526 free_bb_for_insn ();
3528 timevar_pop (TV_FINAL);
3530 if ((*targetm.binds_local_p) (current_function_decl))
3532 int pref = cfun->preferred_stack_boundary;
3533 if (cfun->recursive_call_emit
3534 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3535 pref = cfun->stack_alignment_needed;
3536 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3540 /* Make sure volatile mem refs aren't considered valid operands for
3541 arithmetic insns. We must call this here if this is a nested inline
3542 function, since the above code leaves us in the init_recog state
3543 (from final.c), and the function context push/pop code does not
3544 save/restore volatile_ok.
3546 ??? Maybe it isn't necessary for expand_start_function to call this
3547 anymore if we do it here? */
3549 init_recog_no_volatile ();
3551 /* We're done with this function. Free up memory if we can. */
3552 free_after_parsing (cfun);
3553 if (! DECL_DEFER_OUTPUT (decl))
3555 free_after_compilation (cfun);
3557 /* Clear integrate.c's pointer to the cfun structure we just
3559 DECL_SAVED_INSNS (decl) = 0;
3565 timevar_pop (TV_REST_OF_COMPILATION);
3568 /* Display help for target options. */
3570 display_target_options (void)
3573 static bool displayed = false;
3575 /* Avoid double printing for --help --target-help. */
3581 if (ARRAY_SIZE (target_switches) > 1
3582 #ifdef TARGET_OPTIONS
3583 || ARRAY_SIZE (target_options) > 1
3591 printf (_("\nTarget specific options:\n"));
3593 for (i = ARRAY_SIZE (target_switches); i--;)
3595 const char *option = target_switches[i].name;
3596 const char *description = target_switches[i].description;
3598 if (option == NULL || *option == 0)
3600 else if (description == NULL)
3605 printf (_(" -m%-23s [undocumented]\n"), option);
3607 else if (*description != 0)
3608 doc += printf (" -m%-23s %s\n", option, _(description));
3611 #ifdef TARGET_OPTIONS
3612 for (i = ARRAY_SIZE (target_options); i--;)
3614 const char *option = target_options[i].prefix;
3615 const char *description = target_options[i].description;
3617 if (option == NULL || *option == 0)
3619 else if (description == NULL)
3624 printf (_(" -m%-23s [undocumented]\n"), option);
3626 else if (*description != 0)
3627 doc += printf (" -m%-23s %s\n", option, _(description));
3633 printf (_("\nThere are undocumented target specific options as well.\n"));
3635 printf (_(" They exist, but they are not documented.\n"));
3640 /* Parse a -d... command line switch. */
3643 decode_d_option (const char *arg)
3651 for (i = 0; i < (int) DFI_MAX; ++i)
3652 dump_file[i].enabled = 1;
3658 flag_print_asm_name = 1;
3661 flag_dump_rtl_in_asm = 1;
3662 flag_print_asm_name = 1;
3665 graph_dump_format = vcg;
3668 rtl_dump_and_exit = 1;
3673 case 'D': /* These are handled by the preprocessor. */
3677 setup_core_dumping();
3682 for (i = 0; i < (int) DFI_MAX; ++i)
3683 if (c == dump_file[i].debug_switch)
3685 dump_file[i].enabled = 1;
3690 warning ("unrecognized gcc debugging option: %c", c);
3695 /* Indexed by enum debug_info_type. */
3696 const char *const debug_type_names[] =
3698 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3701 /* Decode -m switches. */
3702 /* Decode the switch -mNAME. */
3705 set_target_switch (const char *name)
3708 int valid_target_option = 0;
3710 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3711 if (!strcmp (target_switches[j].name, name))
3713 if (target_switches[j].value < 0)
3714 target_flags &= ~-target_switches[j].value;
3716 target_flags |= target_switches[j].value;
3719 if (target_switches[j].value < 0)
3720 target_flags_explicit |= -target_switches[j].value;
3722 target_flags_explicit |= target_switches[j].value;
3724 valid_target_option = 1;
3727 #ifdef TARGET_OPTIONS
3728 if (!valid_target_option)
3729 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3731 int len = strlen (target_options[j].prefix);
3732 if (target_options[j].value)
3734 if (!strcmp (target_options[j].prefix, name))
3736 *target_options[j].variable = target_options[j].value;
3737 valid_target_option = 1;
3742 if (!strncmp (target_options[j].prefix, name, len))
3744 *target_options[j].variable = name + len;
3745 valid_target_option = 1;
3751 if (!valid_target_option)
3752 error ("invalid option `%s'", name);
3755 /* Print version information to FILE.
3756 Each line begins with INDENT (for the case where FILE is the
3757 assembler output file). */
3760 print_version (FILE *file, const char *indent)
3763 #define __VERSION__ "[?]"
3767 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
3769 "%s%s%s version %s (%s) compiled by CC.\n"
3771 , indent, *indent != 0 ? " " : "",
3772 lang_hooks.name, version_string, TARGET_NAME,
3773 indent, __VERSION__);
3774 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
3775 indent, *indent != 0 ? " " : "",
3776 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
3779 /* Print an option value and return the adjusted position in the line.
3780 ??? We don't handle error returns from fprintf (disk full); presumably
3781 other code will catch a disk full though. */
3784 print_single_switch (FILE *file, int pos, int max,
3785 const char *indent, const char *sep, const char *term,
3786 const char *type, const char *name)
3788 /* The ultrix fprintf returns 0 on success, so compute the result we want
3789 here since we need it for the following test. */
3790 int len = strlen (sep) + strlen (type) + strlen (name);
3795 fprintf (file, "%s", term);
3800 fprintf (file, "%s", indent);
3801 pos = strlen (indent);
3803 fprintf (file, "%s%s%s", sep, type, name);
3808 /* Print active target switches to FILE.
3809 POS is the current cursor position and MAX is the size of a "line".
3810 Each line begins with INDENT and ends with TERM.
3811 Each switch is separated from the next by SEP. */
3814 print_switch_values (FILE *file, int pos, int max,
3815 const char *indent, const char *sep, const char *term)
3820 /* Fill in the -frandom-seed option, if the user didn't pass it, so
3821 that it can be printed below. This helps reproducibility. */
3824 /* Print the options as passed. */
3825 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
3826 _("options passed: "), "");
3828 for (p = &save_argv[1]; *p != NULL; p++)
3832 if (strcmp (*p, "-o") == 0)
3838 if (strcmp (*p, "-quiet") == 0)
3840 if (strcmp (*p, "-version") == 0)
3845 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
3848 fprintf (file, "%s", term);
3850 /* Print the -f and -m options that have been enabled.
3851 We don't handle language specific options but printing argv
3854 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
3855 _("options enabled: "), "");
3857 for (j = 0; j < ARRAY_SIZE (f_options); j++)
3858 if (*f_options[j].variable == f_options[j].on_value)
3859 pos = print_single_switch (file, pos, max, indent, sep, term,
3860 "-f", f_options[j].string);
3862 /* Print target specific options. */
3864 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
3865 if (target_switches[j].name[0] != '\0'
3866 && target_switches[j].value > 0
3867 && ((target_switches[j].value & target_flags)
3868 == target_switches[j].value))
3870 pos = print_single_switch (file, pos, max, indent, sep, term,
3871 "-m", target_switches[j].name);
3874 #ifdef TARGET_OPTIONS
3875 for (j = 0; j < ARRAY_SIZE (target_options); j++)
3876 if (*target_options[j].variable != NULL)
3879 sprintf (prefix, "-m%s", target_options[j].prefix);
3880 pos = print_single_switch (file, pos, max, indent, sep, term,
3881 prefix, *target_options[j].variable);
3885 fprintf (file, "%s", term);
3888 /* Open assembly code output file. Do this even if -fsyntax-only is
3889 on, because then the driver will have provided the name of a
3890 temporary file or bit bucket for us. NAME is the file specified on
3891 the command line, possibly NULL. */
3893 init_asm_output (const char *name)
3895 if (name == NULL && asm_file_name == 0)
3896 asm_out_file = stdout;
3899 if (asm_file_name == 0)
3901 int len = strlen (dump_base_name);
3902 char *dumpname = xmalloc (len + 6);
3903 memcpy (dumpname, dump_base_name, len + 1);
3904 strip_off_ending (dumpname, len);
3905 strcat (dumpname, ".s");
3906 asm_file_name = dumpname;
3908 if (!strcmp (asm_file_name, "-"))
3909 asm_out_file = stdout;
3911 asm_out_file = fopen (asm_file_name, "w+");
3912 if (asm_out_file == 0)
3913 fatal_error ("can't open %s for writing: %m", asm_file_name);
3916 #ifdef IO_BUFFER_SIZE
3917 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
3918 _IOFBF, IO_BUFFER_SIZE);
3921 if (!flag_syntax_only)
3923 targetm.asm_out.file_start ();
3925 #ifdef ASM_COMMENT_START
3926 if (flag_verbose_asm)
3928 /* Print the list of options in effect. */
3929 print_version (asm_out_file, ASM_COMMENT_START);
3930 print_switch_values (asm_out_file, 0, MAX_LINE,
3931 ASM_COMMENT_START, " ", "\n");
3932 /* Add a blank line here so it appears in assembler output but not
3934 fprintf (asm_out_file, "\n");
3940 /* Default tree printer. Handles declarations only. */
3942 default_tree_printer (pretty_printer * pp, text_info *text)
3944 switch (*text->format_spec)
3950 tree t = va_arg (*text->args_ptr, tree);
3951 const char *n = DECL_NAME (t)
3952 ? (*lang_hooks.decl_printable_name) (t, 2)
3963 /* Initialization of the front end environment, before command line
3964 options are parsed. Signal handlers, internationalization etc.
3965 ARGV0 is main's argv[0]. */
3967 general_init (const char *argv0)
3971 p = argv0 + strlen (argv0);
3972 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
3976 xmalloc_set_program_name (progname);
3980 gcc_init_libintl ();
3982 /* Initialize the diagnostics reporting machinery, so option parsing
3983 can give warnings and errors. */
3984 diagnostic_initialize (global_dc);
3985 /* Set a default printer. Language specific initializations will
3986 override it later. */
3987 pp_format_decoder (global_dc->printer) = &default_tree_printer;
3989 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
3991 signal (SIGSEGV, crash_signal);
3994 signal (SIGILL, crash_signal);
3997 signal (SIGBUS, crash_signal);
4000 signal (SIGABRT, crash_signal);
4002 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4003 signal (SIGIOT, crash_signal);
4006 signal (SIGFPE, crash_signal);
4009 /* Other host-specific signal setup. */
4010 (*host_hooks.extra_signals)();
4012 /* Initialize the garbage-collector, string pools and tree type hash
4018 /* Initialize register usage now so switches may override. */
4021 /* Register the language-independent parameters. */
4022 add_params (lang_independent_params, LAST_PARAM);
4024 /* This must be done after add_params but before argument processing. */
4025 init_ggc_heuristics();
4028 /* Process the options that have been parsed. */
4030 process_options (void)
4032 /* Allow the front end to perform consistency checks and do further
4033 initialization based on the command line options. This hook also
4034 sets the original filename if appropriate (e.g. foo.i -> foo.c)
4035 so we can correctly initialize debug output. */
4036 no_backend = (*lang_hooks.post_options) (&main_input_filename);
4037 input_filename = main_input_filename;
4039 #ifdef OVERRIDE_OPTIONS
4040 /* Some machines may reject certain combinations of options. */
4044 /* Set aux_base_name if not already set. */
4047 else if (main_input_filename)
4049 char *name = xstrdup (lbasename (main_input_filename));
4051 strip_off_ending (name, strlen (name));
4052 aux_base_name = name;
4055 aux_base_name = "gccaux";
4057 /* Set up the align_*_log variables, defaulting them to 1 if they
4058 were still unset. */
4059 if (align_loops <= 0) align_loops = 1;
4060 if (align_loops_max_skip > align_loops || !align_loops)
4061 align_loops_max_skip = align_loops - 1;
4062 align_loops_log = floor_log2 (align_loops * 2 - 1);
4063 if (align_jumps <= 0) align_jumps = 1;
4064 if (align_jumps_max_skip > align_jumps || !align_jumps)
4065 align_jumps_max_skip = align_jumps - 1;
4066 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4067 if (align_labels <= 0) align_labels = 1;
4068 align_labels_log = floor_log2 (align_labels * 2 - 1);
4069 if (align_labels_max_skip > align_labels || !align_labels)
4070 align_labels_max_skip = align_labels - 1;
4071 if (align_functions <= 0) align_functions = 1;
4072 align_functions_log = floor_log2 (align_functions * 2 - 1);
4074 /* Unrolling all loops implies that standard loop unrolling must also
4076 if (flag_unroll_all_loops)
4077 flag_unroll_loops = 1;
4079 if (flag_unroll_loops)
4081 flag_old_unroll_loops = 0;
4082 flag_old_unroll_all_loops = 0;
4085 if (flag_old_unroll_all_loops)
4086 flag_old_unroll_loops = 1;
4088 /* Old loop unrolling requires that strength_reduction be on also. Silently
4089 turn on strength reduction here if it isn't already on. Also, the loop
4090 unrolling code assumes that cse will be run after loop, so that must
4091 be turned on also. */
4092 if (flag_old_unroll_loops)
4094 flag_strength_reduce = 1;
4095 flag_rerun_cse_after_loop = 1;
4097 if (flag_unroll_loops || flag_peel_loops)
4098 flag_rerun_cse_after_loop = 1;
4100 if (flag_non_call_exceptions)
4101 flag_asynchronous_unwind_tables = 1;
4102 if (flag_asynchronous_unwind_tables)
4103 flag_unwind_tables = 1;
4105 /* Disable unit-at-a-time mode for frontends not supporting callgraph
4107 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
4108 flag_unit_at_a_time = 0;
4110 /* Warn about options that are not supported on this machine. */
4111 #ifndef INSN_SCHEDULING
4112 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4113 warning ("instruction scheduling not supported on this target machine");
4116 if (flag_delayed_branch)
4117 warning ("this target machine does not have delayed branches");
4120 user_label_prefix = USER_LABEL_PREFIX;
4121 if (flag_leading_underscore != -1)
4123 /* If the default prefix is more complicated than "" or "_",
4124 issue a warning and ignore this option. */
4125 if (user_label_prefix[0] == 0 ||
4126 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4128 user_label_prefix = flag_leading_underscore ? "_" : "";
4131 warning ("-f%sleading-underscore not supported on this target machine",
4132 flag_leading_underscore ? "" : "no-");
4135 /* If we are in verbose mode, write out the version and maybe all the
4136 option flags in use. */
4139 print_version (stderr, "");
4141 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4144 if (flag_syntax_only)
4146 write_symbols = NO_DEBUG;
4150 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
4152 if (debug_info_level == DINFO_LEVEL_NONE)
4153 write_symbols = NO_DEBUG;
4155 /* Now we know write_symbols, set up the debug hooks based on it.
4156 By default we do nothing for debug output. */
4157 if (write_symbols == NO_DEBUG)
4158 debug_hooks = &do_nothing_debug_hooks;
4159 #if defined(DBX_DEBUGGING_INFO)
4160 else if (write_symbols == DBX_DEBUG)
4161 debug_hooks = &dbx_debug_hooks;
4163 #if defined(XCOFF_DEBUGGING_INFO)
4164 else if (write_symbols == XCOFF_DEBUG)
4165 debug_hooks = &xcoff_debug_hooks;
4167 #ifdef SDB_DEBUGGING_INFO
4168 else if (write_symbols == SDB_DEBUG)
4169 debug_hooks = &sdb_debug_hooks;
4171 #ifdef DWARF_DEBUGGING_INFO
4172 else if (write_symbols == DWARF_DEBUG)
4173 debug_hooks = &dwarf_debug_hooks;
4175 #ifdef DWARF2_DEBUGGING_INFO
4176 else if (write_symbols == DWARF2_DEBUG)
4177 debug_hooks = &dwarf2_debug_hooks;
4179 #ifdef VMS_DEBUGGING_INFO
4180 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4181 debug_hooks = &vmsdbg_debug_hooks;
4184 error ("target system does not support the \"%s\" debug format",
4185 debug_type_names[write_symbols]);
4187 /* If auxiliary info generation is desired, open the output file.
4188 This goes in the same directory as the source file--unlike
4189 all the other output files. */
4190 if (flag_gen_aux_info)
4192 aux_info_file = fopen (aux_info_file_name, "w");
4193 if (aux_info_file == 0)
4194 fatal_error ("can't open %s: %m", aux_info_file_name);
4197 if (! targetm.have_named_sections)
4199 if (flag_function_sections)
4201 warning ("-ffunction-sections not supported for this target");
4202 flag_function_sections = 0;
4204 if (flag_data_sections)
4206 warning ("-fdata-sections not supported for this target");
4207 flag_data_sections = 0;
4211 if (flag_function_sections && profile_flag)
4213 warning ("-ffunction-sections disabled; it makes profiling impossible");
4214 flag_function_sections = 0;
4217 #ifndef HAVE_prefetch
4218 if (flag_prefetch_loop_arrays)
4220 warning ("-fprefetch-loop-arrays not supported for this target");
4221 flag_prefetch_loop_arrays = 0;
4224 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4226 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4227 flag_prefetch_loop_arrays = 0;
4231 /* This combination of options isn't handled for i386 targets and doesn't
4232 make much sense anyway, so don't allow it. */
4233 if (flag_prefetch_loop_arrays && optimize_size)
4235 warning ("-fprefetch-loop-arrays is not supported with -Os");
4236 flag_prefetch_loop_arrays = 0;
4239 #ifndef OBJECT_FORMAT_ELF
4240 if (flag_function_sections && write_symbols != NO_DEBUG)
4241 warning ("-ffunction-sections may affect debugging on some targets");
4244 /* The presence of IEEE signaling NaNs, implies all math can trap. */
4245 if (flag_signaling_nans)
4246 flag_trapping_math = 1;
4249 /* Initialize the compiler back end. */
4253 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
4254 || debug_info_level == DINFO_LEVEL_VERBOSE
4255 #ifdef VMS_DEBUGGING_INFO
4256 /* Enable line number info for traceback. */
4257 || debug_info_level > DINFO_LEVEL_NONE
4259 || flag_test_coverage
4260 || warn_notreached);
4263 init_fake_stack_mems ();
4267 init_function_once ();
4268 init_varasm_once ();
4270 /* The following initialization functions need to generate rtl, so
4271 provide a dummy function context for them. */
4272 init_dummy_function_start ();
4274 if (flag_caller_saves)
4275 init_caller_save ();
4276 expand_dummy_function_end ();
4279 /* Language-dependent initialization. Returns nonzero on success. */
4281 lang_dependent_init (const char *name)
4283 if (dump_base_name == 0)
4284 dump_base_name = name ? name : "gccdump";
4286 /* Other front-end initialization. */
4287 if ((*lang_hooks.init) () == 0)
4290 init_asm_output (name);
4292 /* These create various _DECL nodes, so need to be called after the
4293 front end is initialized. */
4297 /* The following initialization functions need to generate rtl, so
4298 provide a dummy function context for them. */
4299 init_dummy_function_start ();
4301 expand_dummy_function_end ();
4303 /* If dbx symbol table desired, initialize writing it and output the
4304 predefined types. */
4305 timevar_push (TV_SYMOUT);
4307 #ifdef DWARF2_UNWIND_INFO
4308 if (dwarf2out_do_frame ())
4309 dwarf2out_frame_init ();
4312 /* Now we have the correct original filename, we can initialize
4314 (*debug_hooks->init) (name);
4316 timevar_pop (TV_SYMOUT);
4321 /* Clean up: close opened files, etc. */
4326 /* Close the dump files. */
4327 if (flag_gen_aux_info)
4329 fclose (aux_info_file);
4331 unlink (aux_info_file_name);
4334 /* Close non-debugging input and output files. Take special care to note
4335 whether fclose returns an error, since the pages might still be on the
4336 buffer chain while the file is open. */
4340 if (ferror (asm_out_file) != 0)
4341 fatal_error ("error writing to %s: %m", asm_file_name);
4342 if (fclose (asm_out_file) != 0)
4343 fatal_error ("error closing %s: %m", asm_file_name);
4346 /* Do whatever is necessary to finish printing the graphs. */
4347 if (graph_dump_format != no_graph)
4351 for (i = 0; i < (int) DFI_MAX; ++i)
4352 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
4357 sprintf (seq, DUMPFILE_FORMAT, i);
4358 suffix = concat (seq, dump_file[i].extension, NULL);
4359 finish_graph_dump_file (dump_base_name, suffix);
4366 ggc_print_statistics ();
4367 stringpool_statistics ();
4368 dump_tree_statistics ();
4371 /* Free up memory for the benefit of leak detectors. */
4374 /* Language-specific end of compilation actions. */
4375 (*lang_hooks.finish) ();
4378 /* Initialize the compiler, and compile the input file. */
4382 /* Initialize timing first. The C front ends read the main file in
4383 the post_options hook, and C++ does file timings. */
4384 if (time_report || !quiet_flag || flag_detailed_statistics)
4386 timevar_start (TV_TOTAL);
4390 /* Don't do any more if an error has already occurred. */
4393 /* Set up the back-end if requested. */
4397 /* Language-dependent initialization. Returns true on success. */
4398 if (lang_dependent_init (main_input_filename))
4400 if (flag_unit_at_a_time)
4402 open_dump_file (DFI_cgraph, NULL);
4403 cgraph_dump_file = rtl_dump_file;
4404 rtl_dump_file = NULL;
4409 if (flag_unit_at_a_time)
4411 rtl_dump_file = cgraph_dump_file;
4412 cgraph_dump_file = NULL;
4413 close_dump_file (DFI_cgraph, NULL, NULL_RTX);
4420 /* Stop timing and print the times. */
4421 timevar_stop (TV_TOTAL);
4422 timevar_print (stderr);
4425 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4426 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4427 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4429 It is not safe to call this function more than once. */
4432 toplev_main (unsigned int argc, const char **argv)
4436 /* Initialization of GCC's environment, and diagnostics. */
4437 general_init (argv[0]);
4439 /* Parse the options and do minimal processing; basically just
4440 enough to default flags appropriately. */
4441 decode_options (argc, argv);
4445 /* Exit early if we can (e.g. -help). */
4446 if (!exit_after_options)
4449 if (errorcount || sorrycount)
4450 return (FATAL_EXIT_CODE);
4452 return (SUCCESS_EXIT_CODE);