2 /* Top level of GNU C compiler
3 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* This is the top level of cc1/c++.
24 It parses command args, opens files, invokes the various passes
25 in the proper order, and counts the time used by each.
26 Error messages and low-level interface to malloc also handled here. */
29 #undef FLOAT /* This is for hpux. They should change hpux. */
30 #undef FFS /* Some systems define this in param.h. */
34 #ifdef HAVE_SYS_RESOURCE_H
35 # include <sys/resource.h>
38 #ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
47 #include "insn-attr.h"
48 #include "insn-config.h"
49 #include "insn-flags.h"
50 #include "hard-reg-set.h"
57 #include "basic-block.h"
64 #include "diagnostic.h"
68 #include "dwarf2asm.h"
69 #include "integrate.h"
72 #include "langhooks.h"
73 #include "cfglayout.h"
75 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
76 #include "dwarf2out.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
96 /* Carry information from ASM_DECLARE_OBJECT_NAME
97 to ASM_FINISH_DECLARE_OBJECT. */
99 extern int size_directive_output;
100 extern tree last_assemble_variable_decl;
102 static void general_init PARAMS ((char *));
103 static void parse_options_and_default_flags PARAMS ((int, char **));
104 static void do_compile PARAMS ((void));
105 static void process_options PARAMS ((void));
106 static void lang_independent_init PARAMS ((void));
107 static int lang_dependent_init PARAMS ((const char *));
108 static void init_asm_output PARAMS ((const char *));
109 static void finalize PARAMS ((void));
111 static void set_target_switch PARAMS ((const char *));
113 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
114 static void compile_file PARAMS ((void));
115 static void display_help PARAMS ((void));
116 static void display_target_options PARAMS ((void));
118 static void decode_d_option PARAMS ((const char *));
119 static int decode_f_option PARAMS ((const char *));
120 static int decode_W_option PARAMS ((const char *));
121 static int decode_g_option PARAMS ((const char *));
122 static unsigned int independent_decode_option PARAMS ((int, char **));
124 static void print_version PARAMS ((FILE *, const char *));
125 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
126 const char *, const char *,
127 const char *, const char *));
128 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
129 const char *, const char *));
131 /* Nonzero to dump debug info whilst parsing (-dy option). */
132 static int set_yydebug;
134 /* Length of line when printing switch values. */
137 /* Name of program invoked, sans directories. */
139 const char *progname;
141 /* Copy of arguments to toplev_main. */
145 /* Name of current original source file (what was input to cpp).
146 This comes from each #-command in the actual input. */
148 const char *input_filename;
150 /* Name of top-level original source file (what was input to cpp).
151 This comes from the #-command at the beginning of the actual input.
152 If there isn't any there, then this is the cc1 input file name. */
154 const char *main_input_filename;
156 /* Current line number in real source file. */
160 /* Nonzero if it is unsafe to create any new pseudo registers. */
163 /* Stack of currently pending input files. */
165 struct file_stack *input_file_stack;
167 /* Incremented on each change to input_file_stack. */
168 int input_file_stack_tick;
170 /* Name to use as base of names for dump output files. */
172 const char *dump_base_name;
174 /* Format to use to print dumpfile index value */
175 #ifndef DUMPFILE_FORMAT
176 #define DUMPFILE_FORMAT ".%02d."
179 /* Bit flags that specify the machine subtype we are compiling for.
180 Bits are tested using macros TARGET_... defined in the tm.h file
181 and set by `-m...' switches. Must be defined in rtlanal.c. */
183 extern int target_flags;
185 /* Debug hooks - dependent upon command line options. */
187 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
189 /* Describes a dump file. */
191 struct dump_file_info
193 /* The unique extension to apply, e.g. ".jump". */
194 const char *const extension;
196 /* The -d<c> character that enables this dump file. */
197 char const debug_switch;
199 /* True if there is a corresponding graph dump file. */
200 char const graph_dump_p;
202 /* True if the user selected this dump. */
205 /* True if the files have been initialized (ie truncated). */
209 /* Enumerate the extant dump files. */
250 /* Describes all the dump files. Should be kept in order of the
251 pass and in sync with dump_file_index above.
253 Remaining -d letters:
259 static struct dump_file_info dump_file[DFI_MAX] =
261 { "rtl", 'r', 0, 0, 0 },
262 { "sibling", 'i', 0, 0, 0 },
263 { "eh", 'h', 0, 0, 0 },
264 { "jump", 'j', 0, 0, 0 },
265 { "ssa", 'e', 1, 0, 0 },
266 { "ssaccp", 'W', 1, 0, 0 },
267 { "ssadce", 'X', 1, 0, 0 },
268 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
269 { "null", 'u', 0, 0, 0 },
270 { "cse", 's', 0, 0, 0 },
271 { "addressof", 'F', 0, 0, 0 },
272 { "gcse", 'G', 1, 0, 0 },
273 { "loop", 'L', 1, 0, 0 },
274 { "cfg", 'f', 1, 0, 0 },
275 { "bp", 'b', 1, 0, 0 },
276 { "tracer", 'T', 1, 0, 0 },
277 { "cse2", 't', 1, 0, 0 },
278 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
279 { "combine", 'c', 1, 0, 0 },
280 { "ce", 'C', 1, 0, 0 },
281 { "regmove", 'N', 1, 0, 0 },
282 { "sched", 'S', 1, 0, 0 },
283 { "lreg", 'l', 1, 0, 0 },
284 { "greg", 'g', 1, 0, 0 },
285 { "postreload", 'o', 1, 0, 0 },
286 { "flow2", 'w', 1, 0, 0 },
287 { "peephole2", 'z', 1, 0, 0 },
288 { "rnreg", 'n', 1, 0, 0 },
289 { "ce2", 'E', 1, 0, 0 },
290 { "sched2", 'R', 1, 0, 0 },
291 { "stack", 'k', 1, 0, 0 },
292 { "bbro", 'B', 1, 0, 0 },
293 { "mach", 'M', 1, 0, 0 },
294 { "dbr", 'd', 0, 0, 0 },
297 static int open_dump_file PARAMS ((enum dump_file_index, tree));
298 static void close_dump_file PARAMS ((enum dump_file_index,
299 void (*) (FILE *, rtx), rtx));
301 /* Other flags saying which kinds of debugging dump have been requested. */
303 int rtl_dump_and_exit;
304 int flag_print_asm_name;
305 static int version_flag;
306 static char *filename;
307 enum graph_dump_types graph_dump_format;
309 /* Name for output file of assembly code, specified with -o. */
313 /* Value of the -G xx switch, and whether it was passed or not. */
317 /* Type(s) of debugging information we are producing (if any).
318 See flags.h for the definitions of the different possible
319 types of debugging information. */
320 enum debug_info_type write_symbols = NO_DEBUG;
322 /* Level of debugging information we are producing. See flags.h
323 for the definitions of the different possible levels. */
324 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
326 /* Nonzero means use GNU-only extensions in the generated symbolic
327 debugging information. */
328 /* Currently, this only has an effect when write_symbols is set to
329 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
330 int use_gnu_debug_info_extensions = 0;
332 /* Nonzero means do optimizations. -O.
333 Particular numeric values stand for particular amounts of optimization;
334 thus, -O2 stores 2 here. However, the optimizations beyond the basic
335 ones are not controlled directly by this variable. Instead, they are
336 controlled by individual `flag_...' variables that are defaulted
337 based on this variable. */
341 /* Nonzero means optimize for size. -Os.
342 The only valid values are zero and non-zero. When optimize_size is
343 non-zero, optimize defaults to 2, but certain individual code
344 bloating optimizations are disabled. */
346 int optimize_size = 0;
348 /* Nonzero if we should exit after parsing options. */
349 static int exit_after_options = 0;
351 /* The FUNCTION_DECL for the function currently being compiled,
352 or 0 if between functions. */
353 tree current_function_decl;
355 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
357 tree current_function_func_begin_label;
359 /* Nonzero if doing dwarf2 duplicate elimination. */
361 int flag_eliminate_dwarf2_dups = 0;
363 /* Nonzero if generating code to do profiling. */
365 int profile_flag = 0;
367 /* Nonzero if generating code to profile program flow graph arcs. */
369 int profile_arc_flag = 0;
371 /* Nonzero if we should not attempt to generate thread-safe
372 code to profile program flow graph arcs. */
374 int flag_unsafe_profile_arcs = 0;
376 /* Nonzero if generating info for gcov to calculate line test coverage. */
378 int flag_test_coverage = 0;
380 /* Nonzero indicates that branch taken probabilities should be calculated. */
382 int flag_branch_probabilities = 0;
384 /* Nonzero if basic blocks should be reordered. */
386 int flag_reorder_blocks = 0;
388 /* Nonzero if functions should be reordered. */
390 int flag_reorder_functions = 0;
392 /* Nonzero if registers should be renamed. */
394 int flag_rename_registers = 0;
395 int flag_cprop_registers = 0;
397 /* Nonzero for -pedantic switch: warn about anything
398 that standard spec forbids. */
402 /* Temporarily suppress certain warnings.
403 This is set while reading code from a system header file. */
405 int in_system_header = 0;
407 /* Don't print functions as they are compiled. -quiet. */
411 /* Print times taken by the various passes. -ftime-report. */
415 /* Print memory still in use at end of compilation (which may have little
416 to do with peak memory consumption). -fmem-report. */
420 /* Non-zero means to collect statistics which might be expensive
421 and to print them when we are done. */
422 int flag_detailed_statistics = 0;
427 /* Nonzero means `char' should be signed. */
429 int flag_signed_char;
431 /* Nonzero means give an enum type only as many bytes as it needs. */
433 int flag_short_enums;
435 /* Nonzero for -fcaller-saves: allocate values in regs that need to
436 be saved across function calls, if that produces overall better code.
437 Optional now, so people can test it. */
439 #ifdef DEFAULT_CALLER_SAVES
440 int flag_caller_saves = 1;
442 int flag_caller_saves = 0;
445 /* Nonzero if structures and unions should be returned in memory.
447 This should only be defined if compatibility with another compiler or
448 with an ABI is needed, because it results in slower code. */
450 #ifndef DEFAULT_PCC_STRUCT_RETURN
451 #define DEFAULT_PCC_STRUCT_RETURN 1
454 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
456 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
458 /* Nonzero for -fforce-mem: load memory value into a register
459 before arithmetic on it. This makes better cse but slower compilation. */
461 int flag_force_mem = 0;
463 /* Nonzero for -fforce-addr: load memory address into a register before
464 reference to memory. This makes better cse but slower compilation. */
466 int flag_force_addr = 0;
468 /* Nonzero for -fdefer-pop: don't pop args after each function call;
469 instead save them up to pop many calls' args with one insns. */
471 int flag_defer_pop = 0;
473 /* Nonzero for -ffloat-store: don't allocate floats and doubles
474 in extended-precision registers. */
476 int flag_float_store = 0;
478 /* Nonzero for -fcse-follow-jumps:
479 have cse follow jumps to do a more extensive job. */
481 int flag_cse_follow_jumps;
483 /* Nonzero for -fcse-skip-blocks:
484 have cse follow a branch around a block. */
485 int flag_cse_skip_blocks;
487 /* Nonzero for -fexpensive-optimizations:
488 perform miscellaneous relatively-expensive optimizations. */
489 int flag_expensive_optimizations;
491 /* Nonzero for -fthread-jumps:
492 have jump optimize output of loop. */
494 int flag_thread_jumps;
496 /* Nonzero enables strength-reduction in loop.c. */
498 int flag_strength_reduce = 0;
500 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
501 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
502 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
505 int flag_unroll_loops;
507 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
508 This is generally not a win. */
510 int flag_unroll_all_loops;
512 /* Nonzero enables prefetch optimizations for arrays in loops. */
514 int flag_prefetch_loop_arrays;
516 /* Nonzero forces all invariant computations in loops to be moved
519 int flag_move_all_movables = 0;
521 /* Nonzero forces all general induction variables in loops to be
524 int flag_reduce_all_givs = 0;
526 /* Nonzero to perform full register move optimization passes. This is the
529 int flag_regmove = 0;
531 /* Nonzero for -fwritable-strings:
532 store string constants in data segment and don't uniquize them. */
534 int flag_writable_strings = 0;
536 /* Nonzero means don't put addresses of constant functions in registers.
537 Used for compiling the Unix kernel, where strange substitutions are
538 done on the assembly output. */
540 int flag_no_function_cse = 0;
542 /* Nonzero for -fomit-frame-pointer:
543 don't make a frame pointer in simple functions that don't require one. */
545 int flag_omit_frame_pointer = 0;
547 /* Nonzero means place each function into its own section on those platforms
548 which support arbitrary section names and unlimited numbers of sections. */
550 int flag_function_sections = 0;
552 /* ... and similar for data. */
554 int flag_data_sections = 0;
556 /* Nonzero to inhibit use of define_optimization peephole opts. */
558 int flag_no_peephole = 0;
560 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
562 int flag_optimize_sibling_calls = 0;
564 /* Nonzero means the front end generally wants `errno' maintained by math
565 operations, like built-in SQRT. */
567 int flag_errno_math = 1;
569 /* Nonzero means that unsafe floating-point math optimizations are allowed
570 for the sake of speed. IEEE compliance is not guaranteed, and operations
571 are allowed to assume that their arguments and results are "normal"
572 (e.g., nonnegative for SQRT). */
574 int flag_unsafe_math_optimizations = 0;
576 /* Zero means that floating-point math operations cannot generate a
577 (user-visible) trap. This is the case, for example, in nonstop
578 IEEE 754 arithmetic. */
580 int flag_trapping_math = 1;
582 /* 0 means straightforward implementation of complex divide acceptable.
583 1 means wide ranges of inputs must work for complex divide.
584 2 means C99-like requirements for complex divide (not yet implemented). */
586 int flag_complex_divide_method = 0;
588 /* Nonzero means all references through pointers are volatile. */
592 /* Nonzero means treat all global and extern variables as volatile. */
594 int flag_volatile_global;
596 /* Nonzero means treat all static variables as volatile. */
598 int flag_volatile_static;
600 /* Nonzero means just do syntax checking; don't output anything. */
602 int flag_syntax_only = 0;
604 /* Nonzero means perform global cse. */
606 static int flag_gcse;
608 /* Nonzero means perform loop optimizer. */
610 static int flag_loop_optimize;
612 /* Nonzero means perform crossjumping. */
614 static int flag_crossjumping;
616 /* Nonzero means perform if conversion. */
618 static int flag_if_conversion;
620 /* Nonzero means perform if conversion after reload. */
622 static int flag_if_conversion2;
624 /* Nonzero means to use global dataflow analysis to eliminate
625 useless null pointer tests. */
627 static int flag_delete_null_pointer_checks;
629 /* Nonzero means to do the enhanced load motion during gcse, which trys
630 to hoist loads by not killing them when a store to the same location
633 int flag_gcse_lm = 1;
635 /* Nonzero means to perform store motion after gcse, which will try to
636 move stores closer to the exit block. Its not very effective without
639 int flag_gcse_sm = 1;
641 /* Nonzero means to rerun cse after loop optimization. This increases
642 compilation time about 20% and picks up a few more common expressions. */
644 static int flag_rerun_cse_after_loop;
646 /* Nonzero means to run loop optimizations twice. */
648 int flag_rerun_loop_opt;
650 /* Nonzero for -finline-functions: ok to inline functions that look like
651 good inline candidates. */
653 int flag_inline_functions;
655 /* Nonzero for -fkeep-inline-functions: even if we make a function
656 go inline everywhere, keep its definition around for debugging
659 int flag_keep_inline_functions;
661 /* Nonzero means that functions will not be inlined. */
663 int flag_no_inline = 2;
665 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
666 not just because the tree inliner turned us off. */
668 int flag_really_no_inline = 2;
670 /* Nonzero means that we should emit static const variables
671 regardless of whether or not optimization is turned on. */
673 int flag_keep_static_consts = 1;
675 /* Nonzero means we should be saving declaration info into a .X file. */
677 int flag_gen_aux_info = 0;
679 /* Specified name of aux-info file. */
681 static char *aux_info_file_name;
683 /* Nonzero means make the text shared if supported. */
685 int flag_shared_data;
687 /* Nonzero means schedule into delayed branch slots if supported. */
689 int flag_delayed_branch;
691 /* Nonzero if we are compiling pure (sharable) code.
692 Value is 1 if we are doing "small" pic; value is 2 if we're doing
697 /* Set to the default thread-local storage (tls) model to use. */
699 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
701 /* Nonzero means generate extra code for exception handling and enable
702 exception handling. */
706 /* Nonzero means generate frame unwind info table when supported. */
708 int flag_unwind_tables = 0;
710 /* Nonzero means generate frame unwind info table exact at each insn boundary */
712 int flag_asynchronous_unwind_tables = 0;
714 /* Nonzero means don't place uninitialized global data in common storage
719 /* Nonzero means change certain warnings into errors.
720 Usually these are warnings about failure to conform to some standard. */
722 int flag_pedantic_errors = 0;
724 /* flag_schedule_insns means schedule insns within basic blocks (before
726 flag_schedule_insns_after_reload means schedule insns after
729 int flag_schedule_insns = 0;
730 int flag_schedule_insns_after_reload = 0;
732 /* The following flags have effect only for scheduling before register
735 flag_schedule_interblock means schedule insns accross basic blocks.
736 flag_schedule_speculative means allow speculative motion of non-load insns.
737 flag_schedule_speculative_load means allow speculative motion of some
739 flag_schedule_speculative_load_dangerous allows speculative motion of more
742 int flag_schedule_interblock = 1;
743 int flag_schedule_speculative = 1;
744 int flag_schedule_speculative_load = 0;
745 int flag_schedule_speculative_load_dangerous = 0;
747 int flag_single_precision_constant;
749 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
750 by a cheaper branch on a count register. */
751 int flag_branch_on_count_reg = 1;
753 /* -finhibit-size-directive inhibits output of .size for ELF.
754 This is used only for compiling crtstuff.c,
755 and it may be extended to other effects
756 needed for crtstuff.c on other systems. */
757 int flag_inhibit_size_directive = 0;
759 /* -fverbose-asm causes extra commentary information to be produced in
760 the generated assembly code (to make it more readable). This option
761 is generally only of use to those who actually need to read the
762 generated assembly code (perhaps while debugging the compiler itself).
763 -fno-verbose-asm, the default, causes the extra information
764 to be omitted and is useful when comparing two assembler files. */
766 int flag_verbose_asm = 0;
768 /* -dA causes debug commentary information to be produced in
769 the generated assembly code (to make it more readable). This option
770 is generally only of use to those who actually need to read the
771 generated assembly code (perhaps while debugging the compiler itself).
772 Currently, this switch is only used by dwarfout.c; however, it is intended
773 to be a catchall for printing debug information in the assembler file. */
775 int flag_debug_asm = 0;
777 /* -dP causes the rtl to be emitted as a comment in assembly. */
779 int flag_dump_rtl_in_asm = 0;
781 /* -fgnu-linker specifies use of the GNU linker for initializations.
782 (Or, more generally, a linker that handles initializations.)
783 -fno-gnu-linker says that collect2 will be used. */
785 int flag_gnu_linker = 0;
787 int flag_gnu_linker = 1;
790 /* Nonzero means put zero initialized data in the bss section. */
791 int flag_zero_initialized_in_bss = 1;
796 /* Enable ssa conditional constant propagation. */
797 int flag_ssa_ccp = 0;
799 /* Enable ssa aggressive dead code elimination. */
800 int flag_ssa_dce = 0;
802 /* Tag all structures with __attribute__(packed). */
803 int flag_pack_struct = 0;
805 /* Emit code to check for stack overflow; also may cause large objects
806 to be allocated dynamically. */
807 int flag_stack_check;
809 /* When non-NULL, indicates that whenever space is allocated on the
810 stack, the resulting stack pointer must not pass this
811 address---that is, for stacks that grow downward, the stack pointer
812 must always be greater than or equal to this address; for stacks
813 that grow upward, the stack pointer must be less than this address.
814 At present, the rtx may be either a REG or a SYMBOL_REF, although
815 the support provided depends on the backend. */
818 /* 0 if pointer arguments may alias each other. True in C.
819 1 if pointer arguments may not alias each other but may alias
821 2 if pointer arguments may not alias each other and may not
822 alias global variables. True in Fortran.
823 This defaults to 0 for C. */
824 int flag_argument_noalias = 0;
826 /* Nonzero if we should do (language-dependent) alias analysis.
827 Typically, this analysis will assume that expressions of certain
828 types do not alias expressions of certain other types. Only used
829 if alias analysis (in general) is enabled. */
830 int flag_strict_aliasing = 0;
832 /* Instrument functions with calls at entry and exit, for profiling. */
833 int flag_instrument_function_entry_exit = 0;
835 /* Nonzero means ignore `#ident' directives. 0 means handle them.
836 On SVR4 targets, it also controls whether or not to emit a
837 string identifying the compiler. */
839 int flag_no_ident = 0;
841 /* This will perform a peephole pass before sched2. */
842 int flag_peephole2 = 0;
844 /* This will try to guess branch probabilities. */
845 int flag_guess_branch_prob = 0;
847 /* -fbounded-pointers causes gcc to compile pointers as composite
848 objects occupying three words: the pointer value, the base address
849 of the referent object, and the address immediately beyond the end
850 of the referent object. The base and extent allow us to perform
851 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
852 int flag_bounded_pointers = 0;
854 /* -fcheck-bounds causes gcc to generate array bounds checks.
855 For C, C++: defaults to value of flag_bounded_pointers.
856 For ObjC: defaults to off.
857 For Java: defaults to on.
858 For Fortran: defaults to off.
859 For CHILL: defaults to off. */
860 int flag_bounds_check = 0;
862 /* This will attempt to merge constant section constants, if 1 only
863 string constants and constants from constant pool, if 2 also constant
865 int flag_merge_constants = 1;
867 /* If one, renumber instruction UIDs to reduce the number of
868 unused UIDs if there are a lot of instructions. If greater than
869 one, unconditionally renumber instruction UIDs. */
870 int flag_renumber_insns = 1;
872 /* Nonzero if we perform superblock formation. */
876 /* Values of the -falign-* flags: how much to align labels in code.
877 0 means `use default', 1 means `don't align'.
878 For each variable, there is an _log variant which is the power
879 of two not less than the variable, for .align output. */
883 int align_loops_max_skip;
886 int align_jumps_max_skip;
888 int align_labels_log;
889 int align_labels_max_skip;
891 int align_functions_log;
893 /* Table of supported debugging formats. */
896 const char *const arg;
897 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
898 constant expression, we use NO_DEBUG in its place. */
899 const enum debug_info_type debug_type;
900 const int use_extensions_p;
901 const char *const description;
905 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
906 N_("Generate debugging info in default format") },
907 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
908 #ifdef DBX_DEBUGGING_INFO
909 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
910 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
912 #ifdef DWARF_DEBUGGING_INFO
913 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
914 { "dwarf+", DWARF_DEBUG, 1,
915 N_("Generate extended DWARF-1 format debug info") },
917 #ifdef DWARF2_DEBUGGING_INFO
918 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
920 #ifdef XCOFF_DEBUGGING_INFO
921 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
922 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
924 #ifdef SDB_DEBUGGING_INFO
925 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
927 #ifdef VMS_DEBUGGING_INFO
928 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
935 const char *const string;
938 const char *const description;
940 lang_independent_options;
944 /* Add or remove a leading underscore from user symbols. */
945 int flag_leading_underscore = -1;
947 /* The user symbol prefix after having resolved same. */
948 const char *user_label_prefix;
950 static const param_info lang_independent_params[] = {
951 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
952 { OPTION, DEFAULT, HELP },
953 #include "params.def"
958 /* A default for same. */
959 #ifndef USER_LABEL_PREFIX
960 #define USER_LABEL_PREFIX ""
963 /* Table of language-independent -f options.
964 STRING is the option name. VARIABLE is the address of the variable.
965 ON_VALUE is the value to store in VARIABLE
966 if `-fSTRING' is seen as an option.
967 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
969 static const lang_independent_options f_options[] =
971 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
972 N_("Perform DWARF2 duplicate elimination") },
973 {"float-store", &flag_float_store, 1,
974 N_("Do not store floats in registers") },
975 {"volatile", &flag_volatile, 1,
976 N_("Consider all mem refs through pointers as volatile") },
977 {"volatile-global", &flag_volatile_global, 1,
978 N_("Consider all mem refs to global data to be volatile") },
979 {"volatile-static", &flag_volatile_static, 1,
980 N_("Consider all mem refs to static data to be volatile") },
981 {"defer-pop", &flag_defer_pop, 1,
982 N_("Defer popping functions args from stack until later") },
983 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
984 N_("When possible do not generate stack frames") },
985 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
986 N_("Optimize sibling and tail recursive calls") },
987 {"tracer", &flag_tracer, 1,
988 N_("Perform superblock formation via tail duplication") },
989 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
990 N_("When running CSE, follow jumps to their targets") },
991 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
992 N_("When running CSE, follow conditional jumps") },
993 {"expensive-optimizations", &flag_expensive_optimizations, 1,
994 N_("Perform a number of minor, expensive optimizations") },
995 {"thread-jumps", &flag_thread_jumps, 1,
996 N_("Perform jump threading optimizations") },
997 {"strength-reduce", &flag_strength_reduce, 1,
998 N_("Perform strength reduction optimizations") },
999 {"unroll-loops", &flag_unroll_loops, 1,
1000 N_("Perform loop unrolling when iteration count is known") },
1001 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1002 N_("Perform loop unrolling for all loops") },
1003 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1004 N_("Generate prefetch instructions, if available, for arrays in loops") },
1005 {"move-all-movables", &flag_move_all_movables, 1,
1006 N_("Force all loop invariant computations out of loops") },
1007 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1008 N_("Strength reduce all loop general induction variables") },
1009 {"writable-strings", &flag_writable_strings, 1,
1010 N_("Store strings in writable data section") },
1011 {"peephole", &flag_no_peephole, 0,
1012 N_("Enable machine specific peephole optimizations") },
1013 {"force-mem", &flag_force_mem, 1,
1014 N_("Copy memory operands into registers before using") },
1015 {"force-addr", &flag_force_addr, 1,
1016 N_("Copy memory address constants into regs before using") },
1017 {"function-cse", &flag_no_function_cse, 0,
1018 N_("Allow function addresses to be held in registers") },
1019 {"inline-functions", &flag_inline_functions, 1,
1020 N_("Integrate simple functions into their callers") },
1021 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1022 N_("Generate code for funcs even if they are fully inlined") },
1023 {"inline", &flag_no_inline, 0,
1024 N_("Pay attention to the 'inline' keyword") },
1025 {"keep-static-consts", &flag_keep_static_consts, 1,
1026 N_("Emit static const variables even if they are not used") },
1027 {"syntax-only", &flag_syntax_only, 1,
1028 N_("Check for syntax errors, then stop") },
1029 {"shared-data", &flag_shared_data, 1,
1030 N_("Mark data as shared rather than private") },
1031 {"caller-saves", &flag_caller_saves, 1,
1032 N_("Enable saving registers around function calls") },
1033 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1034 N_("Return 'short' aggregates in memory, not registers") },
1035 {"reg-struct-return", &flag_pcc_struct_return, 0,
1036 N_("Return 'short' aggregates in registers") },
1037 {"delayed-branch", &flag_delayed_branch, 1,
1038 N_("Attempt to fill delay slots of branch instructions") },
1039 {"gcse", &flag_gcse, 1,
1040 N_("Perform the global common subexpression elimination") },
1041 {"gcse-lm", &flag_gcse_lm, 1,
1042 N_("Perform enhanced load motion during global subexpression elimination") },
1043 {"gcse-sm", &flag_gcse_sm, 1,
1044 N_("Perform store motion after global subexpression elimination") },
1045 {"loop-optimize", &flag_loop_optimize, 1,
1046 N_("Perform the loop optimizations") },
1047 {"crossjumping", &flag_crossjumping, 1,
1048 N_("Perform cross-jumping optimization") },
1049 {"if-conversion", &flag_if_conversion, 1,
1050 N_("Perform conversion of conditional jumps to branchless equivalents") },
1051 {"if-conversion2", &flag_if_conversion2, 1,
1052 N_("Perform conversion of conditional jumps to conditional execution") },
1053 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1054 N_("Run CSE pass after loop optimizations") },
1055 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1056 N_("Run the loop optimizer twice") },
1057 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1058 N_("Delete useless null pointer checks") },
1059 {"schedule-insns", &flag_schedule_insns, 1,
1060 N_("Reschedule instructions before register allocation") },
1061 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1062 N_("Reschedule instructions after register allocation") },
1063 {"sched-interblock",&flag_schedule_interblock, 1,
1064 N_("Enable scheduling across basic blocks") },
1065 {"sched-spec",&flag_schedule_speculative, 1,
1066 N_("Allow speculative motion of non-loads") },
1067 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1068 N_("Allow speculative motion of some loads") },
1069 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1070 N_("Allow speculative motion of more loads") },
1071 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1072 N_("Replace add,compare,branch with branch on count reg") },
1073 {"pic", &flag_pic, 1,
1074 N_("Generate position independent code, if possible") },
1075 {"PIC", &flag_pic, 2, ""},
1076 {"exceptions", &flag_exceptions, 1,
1077 N_("Enable exception handling") },
1078 {"unwind-tables", &flag_unwind_tables, 1,
1079 N_("Just generate unwind tables for exception handling") },
1080 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1081 N_("Generate unwind tables exact at each instruction boundary") },
1082 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1083 N_("Support synchronous non-call exceptions") },
1084 {"profile-arcs", &profile_arc_flag, 1,
1085 N_("Insert arc based program profiling code") },
1086 {"unsafe-profile-arcs", &flag_unsafe_profile_arcs, 1,
1087 N_("Avoid thread safety profiling overhead") },
1088 {"test-coverage", &flag_test_coverage, 1,
1089 N_("Create data files needed by gcov") },
1090 {"branch-probabilities", &flag_branch_probabilities, 1,
1091 N_("Use profiling information for branch probabilities") },
1092 {"profile", &profile_flag, 1,
1093 N_("Enable basic program profiling code") },
1094 {"reorder-blocks", &flag_reorder_blocks, 1,
1095 N_("Reorder basic blocks to improve code placement") },
1096 {"reorder-functions", &flag_reorder_functions, 1,
1097 N_("Reorder functions to improve code placement") },
1098 {"rename-registers", &flag_rename_registers, 1,
1099 N_("Do the register renaming optimization pass") },
1100 {"cprop-registers", &flag_cprop_registers, 1,
1101 N_("Do the register copy-propagation optimization pass") },
1102 {"common", &flag_no_common, 0,
1103 N_("Do not put uninitialized globals in the common section") },
1104 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1105 N_("Do not generate .size directives") },
1106 {"function-sections", &flag_function_sections, 1,
1107 N_("place each function into its own section") },
1108 {"data-sections", &flag_data_sections, 1,
1109 N_("place data items into their own section") },
1110 {"verbose-asm", &flag_verbose_asm, 1,
1111 N_("Add extra commentry to assembler output") },
1112 {"gnu-linker", &flag_gnu_linker, 1,
1113 N_("Output GNU ld formatted global initializers") },
1114 {"regmove", &flag_regmove, 1,
1115 N_("Enables a register move optimization") },
1116 {"optimize-register-move", &flag_regmove, 1,
1117 N_("Do the full regmove optimization pass") },
1118 {"pack-struct", &flag_pack_struct, 1,
1119 N_("Pack structure members together without holes") },
1120 {"stack-check", &flag_stack_check, 1,
1121 N_("Insert stack checking code into the program") },
1122 {"argument-alias", &flag_argument_noalias, 0,
1123 N_("Specify that arguments may alias each other & globals") },
1124 {"argument-noalias", &flag_argument_noalias, 1,
1125 N_("Assume arguments may alias globals but not each other") },
1126 {"argument-noalias-global", &flag_argument_noalias, 2,
1127 N_("Assume arguments do not alias each other or globals") },
1128 {"strict-aliasing", &flag_strict_aliasing, 1,
1129 N_("Assume strict aliasing rules apply") },
1130 {"align-loops", &align_loops, 0,
1131 N_("Align the start of loops") },
1132 {"align-jumps", &align_jumps, 0,
1133 N_("Align labels which are only reached by jumping") },
1134 {"align-labels", &align_labels, 0,
1135 N_("Align all labels") },
1136 {"align-functions", &align_functions, 0,
1137 N_("Align the start of functions") },
1138 {"merge-constants", &flag_merge_constants, 1,
1139 N_("Attempt to merge identical constants accross compilation units") },
1140 {"merge-all-constants", &flag_merge_constants, 2,
1141 N_("Attempt to merge identical constants and constant variables") },
1142 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1143 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1144 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1145 N_("Instrument function entry/exit with profiling calls") },
1146 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1147 N_("Put zero initialized data in the bss section") },
1148 {"ssa", &flag_ssa, 1,
1149 N_("Enable SSA optimizations") },
1150 {"ssa-ccp", &flag_ssa_ccp, 1,
1151 N_("Enable SSA conditional constant propagation") },
1152 {"ssa-dce", &flag_ssa_dce, 1,
1153 N_("Enable aggressive SSA dead code elimination") },
1154 {"leading-underscore", &flag_leading_underscore, 1,
1155 N_("External symbols have a leading underscore") },
1156 {"ident", &flag_no_ident, 0,
1157 N_("Process #ident directives") },
1158 { "peephole2", &flag_peephole2, 1,
1159 N_("Enables an rtl peephole pass run before sched2") },
1160 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1161 N_("Enables guessing of branch probabilities") },
1162 {"math-errno", &flag_errno_math, 1,
1163 N_("Set errno after built-in math functions") },
1164 {"trapping-math", &flag_trapping_math, 1,
1165 N_("Floating-point operations can trap") },
1166 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1167 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1168 {"bounded-pointers", &flag_bounded_pointers, 1,
1169 N_("Compile pointers as triples: value, base & end") },
1170 {"bounds-check", &flag_bounds_check, 1,
1171 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1172 {"single-precision-constant", &flag_single_precision_constant, 1,
1173 N_("Convert floating point constant to single precision constant") },
1174 {"time-report", &time_report, 1,
1175 N_("Report time taken by each compiler pass at end of run") },
1176 {"mem-report", &mem_report, 1,
1177 N_("Report on permanent memory allocation at end of run") },
1178 { "trapv", &flag_trapv, 1,
1179 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1182 /* Table of language-specific options. */
1184 static const struct lang_opt
1186 const char *const option;
1187 const char *const description;
1189 documented_lang_options[] =
1191 /* In order not to overload the --help output, the convention
1192 used here is to only describe those options which are not
1193 enabled by default. */
1196 N_("Compile just for ISO C89") },
1198 N_("Determine language standard") },
1200 { "-fsigned-bitfields", "" },
1201 { "-funsigned-bitfields",
1202 N_("Make bit-fields by unsigned by default") },
1203 { "-fno-signed-bitfields", "" },
1204 { "-fno-unsigned-bitfields","" },
1206 N_("Make 'char' be signed by default") },
1207 { "-funsigned-char",
1208 N_("Make 'char' be unsigned by default") },
1209 { "-fno-signed-char", "" },
1210 { "-fno-unsigned-char", "" },
1214 N_("Do not recognize the 'asm' keyword") },
1215 { "-fbuiltin", "" },
1217 N_("Do not recognize any built in functions") },
1219 N_("Assume normal C execution environment") },
1220 { "-fno-hosted", "" },
1222 N_("Assume that standard libraries & main might not exist") },
1223 { "-fno-freestanding", "" },
1224 { "-fcond-mismatch",
1225 N_("Allow different types as args of ? operator") },
1226 { "-fno-cond-mismatch", "" },
1227 { "-fdollars-in-identifiers",
1228 N_("Allow the use of $ inside identifiers") },
1229 { "-fno-dollars-in-identifiers", "" },
1230 { "-fpreprocessed", "" },
1231 { "-fno-preprocessed", "" },
1233 N_("Use the same size for double as for float") },
1234 { "-fno-short-double", "" },
1236 N_("Use the smallest fitting integer to hold enums") },
1237 { "-fno-short-enums", "" },
1239 N_("Override the underlying type for wchar_t to `unsigned short'") },
1240 { "-fno-short-wchar", "" },
1243 N_("Enable most warning messages") },
1244 { "-Wbad-function-cast",
1245 N_("Warn about casting functions to incompatible types") },
1246 { "-Wno-bad-function-cast", "" },
1247 { "-Wmissing-format-attribute",
1248 N_("Warn about functions which might be candidates for format attributes") },
1249 { "-Wno-missing-format-attribute", "" },
1251 N_("Warn about casts which discard qualifiers") },
1252 { "-Wno-cast-qual", "" },
1253 { "-Wchar-subscripts",
1254 N_("Warn about subscripts whose type is 'char'") },
1255 { "-Wno-char-subscripts", "" },
1257 N_("Warn if nested comments are detected") },
1258 { "-Wno-comment", "" },
1260 N_("Warn if nested comments are detected") },
1261 { "-Wno-comments", "" },
1263 N_("Warn about possibly confusing type conversions") },
1264 { "-Wno-conversion", "" },
1265 { "-Wdiv-by-zero", "" },
1266 { "-Wno-div-by-zero",
1267 N_("Do not warn about compile-time integer division by zero") },
1269 N_("Warn about testing equality of floating point numbers") },
1270 { "-Wno-float-equal", "" },
1272 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1273 { "-Wno-format", "" },
1274 { "-Wformat-extra-args", "" },
1275 { "-Wno-format-extra-args",
1276 N_("Don't warn about too many arguments to format functions") },
1277 { "-Wformat-nonliteral",
1278 N_("Warn about non-string-literal format strings") },
1279 { "-Wno-format-nonliteral", "" },
1280 { "-Wformat-security",
1281 N_("Warn about possible security problems with format functions") },
1282 { "-Wno-format-security", "" },
1283 { "-Wformat-y2k", "" },
1284 { "-Wno-format-y2k",
1285 N_("Don't warn about strftime formats yielding 2 digit years") },
1286 { "-Wimplicit-function-declaration",
1287 N_("Warn about implicit function declarations") },
1288 { "-Wno-implicit-function-declaration", "" },
1289 { "-Werror-implicit-function-declaration", "" },
1291 N_("Warn when a declaration does not specify a type") },
1292 { "-Wno-implicit-int", "" },
1293 { "-Wimplicit", "" },
1294 { "-Wno-implicit", "" },
1296 N_("Warn about the use of the #import directive") },
1297 { "-Wno-import", "" },
1298 { "-Wlong-long","" },
1300 N_("Do not warn about using 'long long' when -pedantic") },
1302 N_("Warn about suspicious declarations of main") },
1303 { "-Wno-main", "" },
1304 { "-Wmissing-braces",
1305 N_("Warn about possibly missing braces around initializers") },
1306 { "-Wno-missing-braces", "" },
1307 { "-Wmissing-declarations",
1308 N_("Warn about global funcs without previous declarations") },
1309 { "-Wno-missing-declarations", "" },
1310 { "-Wmissing-prototypes",
1311 N_("Warn about global funcs without prototypes") },
1312 { "-Wno-missing-prototypes", "" },
1314 N_("Warn about use of multicharacter literals") },
1315 { "-Wno-multichar", "" },
1316 { "-Wnested-externs",
1317 N_("Warn about externs not at file scope level") },
1318 { "-Wno-nested-externs", "" },
1320 N_("Warn about possible missing parentheses") },
1321 { "-Wno-parentheses", "" },
1322 { "-Wpointer-arith",
1323 N_("Warn about function pointer arithmetic") },
1324 { "-Wno-pointer-arith", "" },
1325 { "-Wredundant-decls",
1326 N_("Warn about multiple declarations of the same object") },
1327 { "-Wno-redundant-decls", "" },
1329 N_("Warn whenever a function's return-type defaults to int") },
1330 { "-Wno-return-type", "" },
1331 { "-Wsequence-point",
1332 N_("Warn about possible violations of sequence point rules") },
1333 { "-Wno-sequence-point", "" },
1335 N_("Warn about signed/unsigned comparisons") },
1336 { "-Wno-sign-compare", "" },
1337 { "-Wstrict-prototypes",
1338 N_("Warn about non-prototyped function decls") },
1339 { "-Wno-strict-prototypes", "" },
1341 N_("Warn about constructs whose meanings change in ISO C") },
1342 { "-Wno-traditional", "" },
1344 N_("Warn when trigraphs are encountered") },
1345 { "-Wno-trigraphs", "" },
1347 { "-Wno-undef", "" },
1348 { "-Wunknown-pragmas",
1349 N_("Warn about unrecognized pragmas") },
1350 { "-Wno-unknown-pragmas", "" },
1351 { "-Wwrite-strings",
1352 N_("Mark strings as 'const char *'") },
1353 { "-Wno-write-strings", "" },
1355 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1357 #include "options.h"
1361 /* Here is a table, controlled by the tm.h file, listing each -m switch
1362 and which bits in `target_switches' it should set or clear.
1363 If VALUE is positive, it is bits to set.
1364 If VALUE is negative, -VALUE is bits to clear.
1365 (The sign bit is not used so there is no confusion.) */
1369 const char *const name;
1371 const char *const description;
1373 target_switches[] = TARGET_SWITCHES;
1375 /* This table is similar, but allows the switch to have a value. */
1377 #ifdef TARGET_OPTIONS
1380 const char *const prefix;
1381 const char **const variable;
1382 const char *const description;
1384 target_options[] = TARGET_OPTIONS;
1387 /* Options controlling warnings. */
1389 /* Don't print warning messages. -w. */
1391 int inhibit_warnings = 0;
1393 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1395 int warn_system_headers = 0;
1397 /* Print various extra warnings. -W. */
1399 int extra_warnings = 0;
1401 /* Treat warnings as errors. -Werror. */
1403 int warnings_are_errors = 0;
1405 /* Nonzero to warn about unused variables, functions et.al. */
1407 int warn_unused_function;
1408 int warn_unused_label;
1409 int warn_unused_parameter;
1410 int warn_unused_variable;
1411 int warn_unused_value;
1413 /* Nonzero to warn about code which is never reached. */
1415 int warn_notreached;
1417 /* Nonzero to warn about variables used before they are initialized. */
1419 int warn_uninitialized;
1421 /* Nonzero means warn about all declarations which shadow others. */
1425 /* Warn if a switch on an enum, that does not have a default case,
1426 fails to have a case for every enum value. */
1430 /* Warn if a switch does not have a default case. */
1432 int warn_switch_default;
1434 /* Warn if a switch on an enum fails to have a case for every enum
1435 value (regardless of the presence or otherwise of a default case). */
1437 int warn_switch_enum;
1439 /* Nonzero means warn about function definitions that default the return type
1440 or that use a null return and have a return-type other than void. */
1442 int warn_return_type;
1444 /* Nonzero means warn about pointer casts that increase the required
1445 alignment of the target type (and might therefore lead to a crash
1446 due to a misaligned access). */
1448 int warn_cast_align;
1450 /* Nonzero means warn about any objects definitions whose size is larger
1451 than N bytes. Also want about function definitions whose returned
1452 values are larger than N bytes. The value N is in `larger_than_size'. */
1454 int warn_larger_than;
1455 HOST_WIDE_INT larger_than_size;
1457 /* Nonzero means warn if inline function is too large. */
1461 /* Warn if a function returns an aggregate,
1462 since there are often incompatible calling conventions for doing this. */
1464 int warn_aggregate_return;
1466 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1470 /* Warn when gcc pads a structure to an alignment boundary. */
1474 /* Warn when an optimization pass is disabled. */
1476 int warn_disabled_optimization;
1478 /* Warn about functions which might be candidates for attribute noreturn. */
1480 int warn_missing_noreturn;
1482 /* Nonzero means warn about uses of __attribute__((deprecated))
1485 int warn_deprecated_decl = 1;
1487 /* Likewise for -W. */
1489 static const lang_independent_options W_options[] =
1491 {"unused-function", &warn_unused_function, 1,
1492 N_("Warn when a function is unused") },
1493 {"unused-label", &warn_unused_label, 1,
1494 N_("Warn when a label is unused") },
1495 {"unused-parameter", &warn_unused_parameter, 1,
1496 N_("Warn when a function parameter is unused") },
1497 {"unused-variable", &warn_unused_variable, 1,
1498 N_("Warn when a variable is unused") },
1499 {"unused-value", &warn_unused_value, 1,
1500 N_("Warn when an expression value is unused") },
1501 {"system-headers", &warn_system_headers, 1,
1502 N_("Do not suppress warnings from system headers") },
1503 {"error", &warnings_are_errors, 1,
1504 N_("Treat all warnings as errors") },
1505 {"shadow", &warn_shadow, 1,
1506 N_("Warn when one local variable shadows another") },
1507 {"switch", &warn_switch, 1,
1508 N_("Warn about enumerated switches, with no default, missing a case") },
1509 {"switch-default", &warn_switch_default, 1,
1510 N_("Warn about enumerated switches missing a default case") },
1511 {"switch-enum", &warn_switch_enum, 1,
1512 N_("Warn about all enumerated switches missing a specific case") },
1513 {"aggregate-return", &warn_aggregate_return, 1,
1514 N_("Warn about returning structures, unions or arrays") },
1515 {"cast-align", &warn_cast_align, 1,
1516 N_("Warn about pointer casts which increase alignment") },
1517 {"unreachable-code", &warn_notreached, 1,
1518 N_("Warn about code that will never be executed") },
1519 {"uninitialized", &warn_uninitialized, 1,
1520 N_("Warn about uninitialized automatic variables") },
1521 {"inline", &warn_inline, 1,
1522 N_("Warn when an inlined function cannot be inlined") },
1523 {"packed", &warn_packed, 1,
1524 N_("Warn when the packed attribute has no effect on struct layout") },
1525 {"padded", &warn_padded, 1,
1526 N_("Warn when padding is required to align struct members") },
1527 {"disabled-optimization", &warn_disabled_optimization, 1,
1528 N_("Warn when an optimization pass is disabled") },
1529 {"deprecated-declarations", &warn_deprecated_decl, 1,
1530 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1531 {"missing-noreturn", &warn_missing_noreturn, 1,
1532 N_("Warn about functions which might be candidates for attribute noreturn") }
1536 set_Wunused (setting)
1539 warn_unused_function = setting;
1540 warn_unused_label = setting;
1541 /* Unused function parameter warnings are reported when either ``-W
1542 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1543 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1545 warn_unused_parameter = 0;
1546 else if (!warn_unused_parameter)
1547 warn_unused_parameter = -1;
1548 warn_unused_variable = setting;
1549 warn_unused_value = setting;
1552 /* The following routines are useful in setting all the flags that
1553 -ffast-math and -fno-fast-math imply. */
1556 set_fast_math_flags (int set)
1558 flag_trapping_math = !set;
1559 flag_unsafe_math_optimizations = set;
1560 flag_errno_math = !set;
1563 /* Return true iff flags are set as if -ffast-math. */
1565 fast_math_flags_set_p ()
1567 return (!flag_trapping_math
1568 && flag_unsafe_math_optimizations
1569 && !flag_errno_math);
1573 /* Output files for assembler code (real compiler output)
1574 and debugging dumps. */
1577 FILE *aux_info_file;
1578 FILE *rtl_dump_file = NULL;
1580 /* Decode the string P as an integral parameter.
1581 If the string is indeed an integer return its numeric value else
1582 issue an Invalid Option error for the option PNAME and return DEFVAL.
1583 If PNAME is zero just return DEFVAL, do not call error. */
1586 read_integral_parameter (p, pname, defval)
1591 const char *endp = p;
1595 if (ISDIGIT (*endp))
1604 error ("invalid option `%s'", pname);
1611 /* This calls abort and is used to avoid problems when abort if a macro.
1612 It is used when we need to pass the address of abort. */
1620 /* When `malloc.c' is compiled with `rcheck' defined,
1621 it calls this function to report clobberage. */
1625 const char *s ATTRIBUTE_UNUSED;
1630 /* Return the logarithm of X, base 2, considering X unsigned,
1631 if X is a power of 2. Otherwise, returns -1.
1633 This should be used via the `exact_log2' macro. */
1637 unsigned HOST_WIDE_INT x;
1640 /* Test for 0 or a power of 2. */
1641 if (x == 0 || x != (x & -x))
1643 while ((x >>= 1) != 0)
1648 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1649 If X is 0, return -1.
1651 This should be used via the floor_log2 macro. */
1655 unsigned HOST_WIDE_INT x;
1664 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1665 into ICE messages, which is much more user friendly. */
1668 crash_signal (signo)
1671 internal_error ("internal error: %s", strsignal (signo));
1674 /* Strip off a legitimate source ending from the input string NAME of
1675 length LEN. Rather than having to know the names used by all of
1676 our front ends, we strip off an ending of a period followed by
1677 up to five characters. (Java uses ".class".) */
1680 strip_off_ending (name, len)
1685 for (i = 2; i < 6 && len > i; i++)
1687 if (name[len - i] == '.')
1689 name[len - i] = '\0';
1695 /* Output a quoted string. */
1698 output_quoted_string (asm_file, string)
1702 #ifdef OUTPUT_QUOTED_STRING
1703 OUTPUT_QUOTED_STRING (asm_file, string);
1707 putc ('\"', asm_file);
1708 while ((c = *string++) != 0)
1712 if (c == '\"' || c == '\\')
1713 putc ('\\', asm_file);
1717 fprintf (asm_file, "\\%03o", (unsigned char) c);
1719 putc ('\"', asm_file);
1723 /* Output NAME into FILE after having turned it into something
1724 usable as an identifier in a target's assembly file. */
1726 output_clean_symbol_name (file, name)
1730 /* Make a copy of NAME. */
1731 char *id = xstrdup (name);
1733 /* Make it look like a valid identifier for an assembler. */
1734 clean_symbol_name (id);
1741 /* Output a file name in the form wanted by System V. */
1744 output_file_directive (asm_file, input_name)
1746 const char *input_name;
1748 int len = strlen (input_name);
1749 const char *na = input_name + len;
1751 /* NA gets INPUT_NAME sans directory names. */
1752 while (na > input_name)
1754 if (IS_DIR_SEPARATOR (na[-1]))
1759 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1760 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1762 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1763 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1765 fprintf (asm_file, "\t.file\t");
1766 output_quoted_string (asm_file, na);
1767 fputc ('\n', asm_file);
1772 /* Routine to open a dump file. Return true if the dump file is enabled. */
1775 open_dump_file (index, decl)
1776 enum dump_file_index index;
1780 const char *open_arg;
1783 if (! dump_file[index].enabled)
1786 timevar_push (TV_DUMP);
1787 if (rtl_dump_file != NULL)
1788 fclose (rtl_dump_file);
1790 sprintf (seq, DUMPFILE_FORMAT, index);
1792 if (! dump_file[index].initialized)
1794 /* If we've not initialized the files, do so now. */
1795 if (graph_dump_format != no_graph
1796 && dump_file[index].graph_dump_p)
1798 dump_name = concat (seq, dump_file[index].extension, NULL);
1799 clean_graph_dump_file (dump_base_name, dump_name);
1802 dump_file[index].initialized = 1;
1808 dump_name = concat (dump_base_name, seq,
1809 dump_file[index].extension, NULL);
1811 rtl_dump_file = fopen (dump_name, open_arg);
1812 if (rtl_dump_file == NULL)
1813 fatal_io_error ("can't open %s", dump_name);
1818 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1819 (*lang_hooks.decl_printable_name) (decl, 2),
1820 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1822 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1823 ? " (unlikely executed)"
1826 timevar_pop (TV_DUMP);
1830 /* Routine to close a dump file. */
1833 close_dump_file (index, func, insns)
1834 enum dump_file_index index;
1835 void (*func) PARAMS ((FILE *, rtx));
1838 if (! rtl_dump_file)
1841 timevar_push (TV_DUMP);
1843 && graph_dump_format != no_graph
1844 && dump_file[index].graph_dump_p)
1849 sprintf (seq, DUMPFILE_FORMAT, index);
1850 suffix = concat (seq, dump_file[index].extension, NULL);
1851 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1856 func (rtl_dump_file, insns);
1858 fflush (rtl_dump_file);
1859 fclose (rtl_dump_file);
1861 rtl_dump_file = NULL;
1862 timevar_pop (TV_DUMP);
1865 /* Do any final processing required for the declarations in VEC, of
1866 which there are LEN. We write out inline functions and variables
1867 that have been deferred until this point, but which are required.
1868 Returns non-zero if anything was put out. */
1871 wrapup_global_declarations (vec, len)
1878 int output_something = 0;
1880 for (i = 0; i < len; i++)
1884 /* We're not deferring this any longer. */
1885 DECL_DEFER_OUTPUT (decl) = 0;
1887 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1888 (*lang_hooks.finish_incomplete_decl) (decl);
1891 /* Now emit any global variables or functions that we have been
1892 putting off. We need to loop in case one of the things emitted
1893 here references another one which comes earlier in the list. */
1897 for (i = 0; i < len; i++)
1901 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1904 /* Don't write out static consts, unless we still need them.
1906 We also keep static consts if not optimizing (for debugging),
1907 unless the user specified -fno-keep-static-consts.
1908 ??? They might be better written into the debug information.
1909 This is possible when using DWARF.
1911 A language processor that wants static constants to be always
1912 written out (even if it is not used) is responsible for
1913 calling rest_of_decl_compilation itself. E.g. the C front-end
1914 calls rest_of_decl_compilation from finish_decl.
1915 One motivation for this is that is conventional in some
1916 environments to write things like:
1917 static const char rcsid[] = "... version string ...";
1918 intending to force the string to be in the executable.
1920 A language processor that would prefer to have unneeded
1921 static constants "optimized away" would just defer writing
1922 them out until here. E.g. C++ does this, because static
1923 constants are often defined in header files.
1925 ??? A tempting alternative (for both C and C++) would be
1926 to force a constant to be written if and only if it is
1927 defined in a main file, as opposed to an include file. */
1929 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1933 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1935 else if (DECL_COMDAT (decl))
1937 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1938 && (optimize || !flag_keep_static_consts
1939 || DECL_ARTIFICIAL (decl)))
1945 rest_of_decl_compilation (decl, NULL, 1, 1);
1949 if (TREE_CODE (decl) == FUNCTION_DECL
1950 && DECL_INITIAL (decl) != 0
1951 && DECL_SAVED_INSNS (decl) != 0
1952 && (flag_keep_inline_functions
1953 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1954 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1957 output_inline_function (decl);
1962 output_something = 1;
1966 return output_something;
1969 /* Issue appropriate warnings for the global declarations in VEC (of
1970 which there are LEN). Output debugging information for them. */
1973 check_global_declarations (vec, len)
1980 for (i = 0; i < len; i++)
1984 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1985 && ! TREE_ASM_WRITTEN (decl))
1986 /* Cancel the RTL for this decl so that, if debugging info
1987 output for global variables is still to come,
1988 this one will be omitted. */
1989 SET_DECL_RTL (decl, NULL_RTX);
1991 /* Warn about any function
1992 declared static but not defined.
1993 We don't warn about variables,
1994 because many programs have static variables
1995 that exist only to get some text into the object file. */
1996 if (TREE_CODE (decl) == FUNCTION_DECL
1997 && (warn_unused_function
1998 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1999 && DECL_INITIAL (decl) == 0
2000 && DECL_EXTERNAL (decl)
2001 && ! DECL_ARTIFICIAL (decl)
2002 && ! TREE_PUBLIC (decl))
2004 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2005 pedwarn_with_decl (decl,
2006 "`%s' used but never defined");
2008 warning_with_decl (decl,
2009 "`%s' declared `static' but never defined");
2010 /* This symbol is effectively an "extern" declaration now. */
2011 TREE_PUBLIC (decl) = 1;
2012 assemble_external (decl);
2015 /* Warn about static fns or vars defined but not used. */
2016 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2017 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2018 && ! TREE_USED (decl)
2019 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2020 to handle multiple external decls in different scopes. */
2021 && ! TREE_USED (DECL_NAME (decl))
2022 && ! DECL_EXTERNAL (decl)
2023 && ! TREE_PUBLIC (decl)
2024 /* Global register variables must be declared to reserve them. */
2025 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2026 /* Otherwise, ask the language. */
2027 && (*lang_hooks.decls.warn_unused_global) (decl))
2028 warning_with_decl (decl, "`%s' defined but not used");
2030 timevar_push (TV_SYMOUT);
2031 (*debug_hooks->global_decl) (decl);
2032 timevar_pop (TV_SYMOUT);
2036 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2037 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2038 INPUT_FILENAME and LINENO accordingly. */
2041 push_srcloc (file, line)
2045 struct file_stack *fs;
2047 if (input_file_stack)
2049 input_file_stack->name = input_filename;
2050 input_file_stack->line = lineno;
2053 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2054 fs->name = input_filename = file;
2055 fs->line = lineno = line;
2056 fs->next = input_file_stack;
2057 input_file_stack = fs;
2058 input_file_stack_tick++;
2061 /* Pop the top entry off the stack of presently open source files.
2062 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2068 struct file_stack *fs;
2070 fs = input_file_stack;
2071 input_file_stack = fs->next;
2073 input_file_stack_tick++;
2074 /* The initial source file is never popped. */
2075 if (!input_file_stack)
2077 input_filename = input_file_stack->name;
2078 lineno = input_file_stack->line;
2081 /* Compile an entire translation unit. Write a file of assembly
2082 output and various debugging dumps. */
2089 /* Initialize yet another pass. */
2091 init_final (main_input_filename);
2092 init_branch_prob (dump_base_name);
2094 timevar_push (TV_PARSE);
2096 /* Call the parser, which parses the entire file (calling
2097 rest_of_compilation for each function). */
2098 (*lang_hooks.parse_file) (set_yydebug);
2100 /* In case there were missing block closers,
2101 get us back to the global binding level. */
2102 (*lang_hooks.clear_binding_stack) ();
2104 /* Compilation is now finished except for writing
2105 what's left of the symbol table output. */
2106 timevar_pop (TV_PARSE);
2108 if (flag_syntax_only)
2111 globals = (*lang_hooks.decls.getdecls) ();
2113 /* Really define vars that have had only a tentative definition.
2114 Really output inline functions that must actually be callable
2115 and have not been output so far. */
2118 int len = list_length (globals);
2119 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2123 /* Process the decls in reverse order--earliest first.
2124 Put them into VEC from back to front, then take out from front. */
2126 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2127 vec[len - i - 1] = decl;
2129 wrapup_global_declarations (vec, len);
2131 /* This must occur after the loop to output deferred functions. Else
2132 the profiler initializer would not be emitted if all the functions
2133 in this compilation unit were deferred.
2135 output_func_start_profiler can not cause any additional functions or
2136 data to need to be output, so it need not be in the deferred function
2138 output_func_start_profiler ();
2140 check_global_declarations (vec, len);
2146 /* Write out any pending weak symbol declarations. */
2150 /* Do dbx symbols. */
2151 timevar_push (TV_SYMOUT);
2153 #ifdef DWARF2_UNWIND_INFO
2154 if (dwarf2out_do_frame ())
2155 dwarf2out_frame_finish ();
2158 (*debug_hooks->finish) (main_input_filename);
2159 timevar_pop (TV_SYMOUT);
2161 /* Output some stuff at end of file if nec. */
2163 dw2_output_indirect_constants ();
2165 end_final (dump_base_name);
2167 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2169 timevar_push (TV_DUMP);
2170 open_dump_file (DFI_bp, NULL);
2174 close_dump_file (DFI_bp, NULL, NULL_RTX);
2175 timevar_pop (TV_DUMP);
2179 ASM_FILE_END (asm_out_file);
2182 /* Attach a special .ident directive to the end of the file to identify
2183 the version of GCC which compiled this code. The format of the .ident
2184 string is patterned after the ones produced by native SVR4 compilers. */
2187 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2188 IDENT_ASM_OP, version_string);
2191 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2193 timevar_push (TV_DUMP);
2194 dump_combine_total_stats (rtl_dump_file);
2195 close_dump_file (DFI_combine, NULL, NULL_RTX);
2196 timevar_pop (TV_DUMP);
2200 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2201 and TYPE_DECL nodes.
2203 This does nothing for local (non-static) variables, unless the
2204 variable is a register variable with an ASMSPEC. In that case, or
2205 if the variable is not an automatic, it sets up the RTL and
2206 outputs any assembler code (label definition, storage allocation
2207 and initialization).
2209 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2210 the assembler symbol name to be used. TOP_LEVEL is nonzero
2211 if this declaration is not within a function. */
2214 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2216 const char *asmspec;
2220 /* Declarations of variables, and of functions defined elsewhere. */
2222 /* The most obvious approach, to put an #ifndef around where
2223 this macro is used, doesn't work since it's inside a macro call. */
2224 #ifndef ASM_FINISH_DECLARE_OBJECT
2225 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2228 /* We deferred calling assemble_alias so that we could collect
2229 other attributes such as visibility. Emit the alias now. */
2232 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2235 alias = TREE_VALUE (TREE_VALUE (alias));
2236 alias = get_identifier (TREE_STRING_POINTER (alias));
2237 assemble_alias (decl, alias);
2241 /* Forward declarations for nested functions are not "external",
2242 but we need to treat them as if they were. */
2243 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2244 || TREE_CODE (decl) == FUNCTION_DECL)
2246 timevar_push (TV_VARCONST);
2249 make_decl_rtl (decl, asmspec);
2251 /* Don't output anything when a tentative file-scope definition
2252 is seen. But at end of compilation, do output code for them. */
2253 if (at_end || !DECL_DEFER_OUTPUT (decl))
2254 assemble_variable (decl, top_level, at_end, 0);
2255 if (decl == last_assemble_variable_decl)
2257 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2261 timevar_pop (TV_VARCONST);
2263 else if (DECL_REGISTER (decl) && asmspec != 0)
2265 if (decode_reg_name (asmspec) >= 0)
2267 SET_DECL_RTL (decl, NULL_RTX);
2268 make_decl_rtl (decl, asmspec);
2272 error ("invalid register name `%s' for register variable", asmspec);
2273 DECL_REGISTER (decl) = 0;
2278 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2279 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2280 && TREE_CODE (decl) == TYPE_DECL)
2282 timevar_push (TV_SYMOUT);
2283 dbxout_symbol (decl, 0);
2284 timevar_pop (TV_SYMOUT);
2287 #ifdef SDB_DEBUGGING_INFO
2288 else if (write_symbols == SDB_DEBUG && top_level
2289 && TREE_CODE (decl) == TYPE_DECL)
2291 timevar_push (TV_SYMOUT);
2292 sdbout_symbol (decl, 0);
2293 timevar_pop (TV_SYMOUT);
2298 /* Called after finishing a record, union or enumeral type. */
2301 rest_of_type_compilation (type, toplev)
2302 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2306 tree type ATTRIBUTE_UNUSED;
2307 int toplev ATTRIBUTE_UNUSED;
2310 timevar_push (TV_SYMOUT);
2311 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2312 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2313 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2315 #ifdef SDB_DEBUGGING_INFO
2316 if (write_symbols == SDB_DEBUG)
2317 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2319 #ifdef DWARF2_DEBUGGING_INFO
2320 if ((write_symbols == DWARF2_DEBUG
2321 || write_symbols == VMS_AND_DWARF2_DEBUG)
2323 dwarf2out_decl (TYPE_STUB_DECL (type));
2325 timevar_pop (TV_SYMOUT);
2328 /* This is called from finish_function (within langhooks.parse_file)
2329 after each top-level definition is parsed.
2330 It is supposed to compile that function or variable
2331 and output the assembler code for it.
2332 After we return, the tree storage is freed. */
2335 rest_of_compilation (decl)
2341 int rebuild_label_notes_after_reload;
2342 int register_life_up_to_date;
2344 timevar_push (TV_REST_OF_COMPILATION);
2346 /* Now that we're out of the frontend, we shouldn't have any more
2347 CONCATs anywhere. */
2348 generating_concat_p = 0;
2350 /* When processing delayed functions, prepare_function_start() won't
2351 have been run to re-initialize it. */
2352 cse_not_expected = ! optimize;
2354 /* First, make sure that NOTE_BLOCK is set correctly for each
2355 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2356 if (!cfun->x_whole_function_mode_p)
2359 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2360 tree in sensible shape. So, we just recalculate it here. */
2361 if (cfun->x_whole_function_mode_p)
2366 /* If we are reconsidering an inline function
2367 at the end of compilation, skip the stuff for making it inline. */
2369 if (DECL_SAVED_INSNS (decl) == 0)
2375 /* If this is nested inside an inlined external function, pretend
2376 it was only declared. Since we cannot inline such functions,
2377 generating code for this one is not only not necessary but will
2378 confuse some debugging output writers. */
2379 for (parent = DECL_CONTEXT (current_function_decl);
2380 parent != NULL_TREE;
2381 parent = get_containing_scope (parent))
2382 if (TREE_CODE (parent) == FUNCTION_DECL
2383 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2385 DECL_INITIAL (decl) = 0;
2386 goto exit_rest_of_compilation;
2389 /* If requested, consider whether to make this function inline. */
2390 if ((DECL_INLINE (decl) && !flag_no_inline)
2391 || flag_inline_functions)
2393 timevar_push (TV_INTEGRATION);
2394 lose = function_cannot_inline_p (decl);
2395 timevar_pop (TV_INTEGRATION);
2396 if (lose || ! optimize)
2398 if (warn_inline && DECL_INLINE (decl))
2399 warning_with_decl (decl, lose);
2400 DECL_ABSTRACT_ORIGIN (decl) = 0;
2401 /* Don't really compile an extern inline function.
2402 If we can't make it inline, pretend
2403 it was only declared. */
2404 if (DECL_EXTERNAL (decl))
2406 DECL_INITIAL (decl) = 0;
2407 goto exit_rest_of_compilation;
2411 /* ??? Note that this has the effect of making it look
2412 like "inline" was specified for a function if we choose
2413 to inline it. This isn't quite right, but it's
2414 probably not worth the trouble to fix. */
2415 inlinable = DECL_INLINE (decl) = 1;
2418 insns = get_insns ();
2420 /* Dump the rtl code if we are dumping rtl. */
2422 if (open_dump_file (DFI_rtl, decl))
2424 if (DECL_SAVED_INSNS (decl))
2425 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2426 close_dump_file (DFI_rtl, print_rtl, insns);
2429 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2430 sorts of eh initialization. Delay this until after the
2431 initial rtl dump so that we can see the original nesting. */
2432 convert_from_eh_region_ranges ();
2434 /* If function is inline, and we don't yet know whether to
2435 compile it by itself, defer decision till end of compilation.
2436 finish_compilation will call rest_of_compilation again
2437 for those functions that need to be output. Also defer those
2438 functions that we are supposed to defer. */
2441 || (DECL_INLINE (decl)
2442 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2443 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2444 && ! flag_keep_inline_functions)
2445 || DECL_EXTERNAL (decl))))
2446 DECL_DEFER_OUTPUT (decl) = 1;
2448 if (DECL_INLINE (decl))
2449 /* DWARF wants separate debugging info for abstract and
2450 concrete instances of all inline functions, including those
2451 declared inline but not inlined, and those inlined even
2452 though they weren't declared inline. Conveniently, that's
2453 what DECL_INLINE means at this point. */
2454 (*debug_hooks->deferred_inline_function) (decl);
2456 if (DECL_DEFER_OUTPUT (decl))
2458 /* If -Wreturn-type, we have to do a bit of compilation. We just
2459 want to call cleanup the cfg to figure out whether or not we can
2460 fall off the end of the function; we do the minimum amount of
2461 work necessary to make that safe. */
2462 if (warn_return_type)
2464 int saved_optimize = optimize;
2467 rebuild_jump_labels (insns);
2468 find_exception_handler_labels ();
2469 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2470 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2471 optimize = saved_optimize;
2473 /* CFG is no longer maintained up-to-date. */
2474 free_bb_for_insn ();
2477 current_function_nothrow = nothrow_function_p ();
2478 if (current_function_nothrow)
2479 /* Now we know that this can't throw; set the flag for the benefit
2480 of other functions later in this translation unit. */
2481 TREE_NOTHROW (current_function_decl) = 1;
2483 timevar_push (TV_INTEGRATION);
2484 save_for_inline (decl);
2485 timevar_pop (TV_INTEGRATION);
2486 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2487 goto exit_rest_of_compilation;
2490 /* If specified extern inline but we aren't inlining it, we are
2491 done. This goes for anything that gets here with DECL_EXTERNAL
2492 set, not just things with DECL_INLINE. */
2493 if (DECL_EXTERNAL (decl))
2494 goto exit_rest_of_compilation;
2497 /* If we're emitting a nested function, make sure its parent gets
2498 emitted as well. Doing otherwise confuses debug info. */
2501 for (parent = DECL_CONTEXT (current_function_decl);
2502 parent != NULL_TREE;
2503 parent = get_containing_scope (parent))
2504 if (TREE_CODE (parent) == FUNCTION_DECL)
2505 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2508 /* We are now committed to emitting code for this function. Do any
2509 preparation, such as emitting abstract debug info for the inline
2510 before it gets mangled by optimization. */
2511 if (DECL_INLINE (decl))
2512 (*debug_hooks->outlining_inline_function) (decl);
2514 /* Remove any notes we don't need. That will make iterating
2515 over the instruction sequence faster, and allow the garbage
2516 collector to reclaim the memory used by the notes. */
2517 remove_unnecessary_notes ();
2522 /* Initialize some variables used by the optimizers. */
2523 init_function_for_compilation ();
2525 if (! DECL_DEFER_OUTPUT (decl))
2526 TREE_ASM_WRITTEN (decl) = 1;
2528 /* Now that integrate will no longer see our rtl, we need not
2529 distinguish between the return value of this function and the
2530 return value of called functions. Also, we can remove all SETs
2531 of subregs of hard registers; they are only here because of
2532 integrate. Also, we can now initialize pseudos intended to
2533 carry magic hard reg data throughout the function. */
2534 rtx_equal_function_value_matters = 0;
2535 purge_hard_subreg_sets (get_insns ());
2537 /* Early return if there were errors. We can run afoul of our
2538 consistency checks, and there's not really much point in fixing them.
2539 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2540 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2541 || errorcount || sorrycount)
2542 goto exit_rest_of_compilation;
2544 timevar_push (TV_JUMP);
2545 open_dump_file (DFI_sibling, decl);
2546 insns = get_insns ();
2547 rebuild_jump_labels (insns);
2548 find_exception_handler_labels ();
2549 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2551 delete_unreachable_blocks ();
2553 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2554 note_prediction_to_br_prob ();
2556 /* We may have potential sibling or tail recursion sites. Select one
2557 (of possibly multiple) methods of performing the call. */
2558 if (flag_optimize_sibling_calls)
2561 optimize_sibling_and_tail_recursive_calls ();
2563 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2564 notes before simplifying cfg and we must do lowering after sibcall
2565 that unhides parts of RTL chain and cleans up the CFG.
2567 Until sibcall is replaced by tree-level optimizer, lets just
2568 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2569 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2570 if (GET_CODE (insn) == NOTE
2571 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2574 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2575 timevar_pop (TV_JUMP);
2577 scope_to_insns_initialize ();
2578 /* Complete generation of exception handling code. */
2579 find_exception_handler_labels ();
2582 timevar_push (TV_JUMP);
2583 open_dump_file (DFI_eh, decl);
2585 finish_eh_generation ();
2587 close_dump_file (DFI_eh, print_rtl, get_insns ());
2588 timevar_pop (TV_JUMP);
2591 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2592 generation, which might create new sets. */
2593 emit_initial_value_sets ();
2596 /* If we are doing position-independent code generation, now
2597 is the time to output special prologues and epilogues.
2598 We do not want to do this earlier, because it just clutters
2599 up inline functions with meaningless insns. */
2604 insns = get_insns ();
2606 /* Copy any shared structure that should not be shared. */
2607 unshare_all_rtl (current_function_decl, insns);
2609 #ifdef SETJMP_VIA_SAVE_AREA
2610 /* This must be performed before virtual register instantiation.
2611 Please be aware the everything in the compiler that can look
2612 at the RTL up to this point must understand that REG_SAVE_AREA
2613 is just like a use of the REG contained inside. */
2614 if (current_function_calls_alloca)
2615 optimize_save_area_alloca (insns);
2618 /* Instantiate all virtual registers. */
2619 instantiate_virtual_regs (current_function_decl, insns);
2621 open_dump_file (DFI_jump, decl);
2623 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2624 are initialized and to compute whether control can drop off the end
2627 timevar_push (TV_JUMP);
2628 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2629 before jump optimization switches branch directions. */
2630 expected_value_to_br_prob ();
2632 reg_scan (insns, max_reg_num (), 0);
2633 rebuild_jump_labels (insns);
2634 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2636 dump_flow_info (rtl_dump_file);
2637 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2638 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2640 /* CFG is no longer maintained up-to-date. */
2641 free_bb_for_insn ();
2642 copy_loop_headers (insns);
2643 purge_line_number_notes (insns);
2645 timevar_pop (TV_JUMP);
2646 close_dump_file (DFI_jump, print_rtl, insns);
2648 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2649 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2651 goto exit_rest_of_compilation;
2654 /* Long term, this should probably move before the jump optimizer too,
2655 but I didn't want to disturb the rtl_dump_and_exit and related
2656 stuff at this time. */
2657 if (optimize > 0 && flag_ssa)
2659 /* Convert to SSA form. */
2661 timevar_push (TV_TO_SSA);
2662 open_dump_file (DFI_ssa, decl);
2664 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2665 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2668 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2669 timevar_pop (TV_TO_SSA);
2671 /* Perform sparse conditional constant propagation, if requested. */
2674 timevar_push (TV_SSA_CCP);
2675 open_dump_file (DFI_ssa_ccp, decl);
2679 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2680 timevar_pop (TV_SSA_CCP);
2683 /* It would be useful to cleanup the CFG at this point, but block
2684 merging and possibly other transformations might leave a PHI
2685 node in the middle of a basic block, which is a strict no-no. */
2687 /* The SSA implementation uses basic block numbers in its phi
2688 nodes. Thus, changing the control-flow graph or the basic
2689 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2690 may cause problems. */
2694 /* Remove dead code. */
2696 timevar_push (TV_SSA_DCE);
2697 open_dump_file (DFI_ssa_dce, decl);
2699 insns = get_insns ();
2700 ssa_eliminate_dead_code ();
2702 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2703 timevar_pop (TV_SSA_DCE);
2706 /* Convert from SSA form. */
2708 timevar_push (TV_FROM_SSA);
2709 open_dump_file (DFI_ussa, decl);
2711 convert_from_ssa ();
2712 /* New registers have been created. Rescan their usage. */
2713 reg_scan (insns, max_reg_num (), 1);
2715 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2716 timevar_pop (TV_FROM_SSA);
2719 /* CFG is no longer maintained up-to-date. */
2720 free_bb_for_insn ();
2723 timevar_push (TV_JUMP);
2725 if (flag_delete_null_pointer_checks || flag_if_conversion)
2727 open_dump_file (DFI_null, decl);
2728 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2730 dump_flow_info (rtl_dump_file);
2731 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2733 /* Try to identify useless null pointer tests and delete them. */
2734 if (flag_delete_null_pointer_checks)
2735 delete_null_pointer_checks (insns);
2737 timevar_push (TV_IFCVT);
2738 if (flag_if_conversion)
2740 timevar_pop (TV_IFCVT);
2741 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2742 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2745 /* Jump optimization, and the removal of NULL pointer checks, may
2746 have reduced the number of instructions substantially. CSE, and
2747 future passes, allocate arrays whose dimensions involve the
2748 maximum instruction UID, so if we can reduce the maximum UID
2749 we'll save big on memory. */
2750 renumber_insns (rtl_dump_file);
2752 compute_bb_for_insn (get_max_uid ());
2753 timevar_pop (TV_JUMP);
2755 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2759 /* Perform common subexpression elimination.
2760 Nonzero value from `cse_main' means that jumps were simplified
2761 and some code may now be unreachable, so do
2762 jump optimization again. */
2766 open_dump_file (DFI_cse, decl);
2768 dump_flow_info (rtl_dump_file);
2769 timevar_push (TV_CSE);
2771 reg_scan (insns, max_reg_num (), 1);
2773 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2775 rebuild_jump_labels (insns);
2776 purge_all_dead_edges (0);
2778 delete_trivially_dead_insns (insns, max_reg_num ());
2780 /* If we are not running more CSE passes, then we are no longer
2781 expecting CSE to be run. But always rerun it in a cheap mode. */
2782 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2784 if (tem || optimize > 1)
2785 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2786 /* Try to identify useless null pointer tests and delete them. */
2787 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2789 timevar_push (TV_JUMP);
2791 if (flag_delete_null_pointer_checks)
2792 delete_null_pointer_checks (insns);
2793 /* CFG is no longer maintained up-to-date. */
2794 timevar_pop (TV_JUMP);
2797 /* The second pass of jump optimization is likely to have
2798 removed a bunch more instructions. */
2799 renumber_insns (rtl_dump_file);
2800 compute_bb_for_insn (get_max_uid ());
2802 timevar_pop (TV_CSE);
2803 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2806 open_dump_file (DFI_addressof, decl);
2808 purge_addressof (insns);
2810 purge_all_dead_edges (0);
2811 reg_scan (insns, max_reg_num (), 1);
2813 close_dump_file (DFI_addressof, print_rtl, insns);
2817 /* Perform global cse. */
2819 if (optimize > 0 && flag_gcse)
2821 int save_csb, save_cfj;
2824 timevar_push (TV_GCSE);
2825 open_dump_file (DFI_gcse, decl);
2827 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2828 tem = gcse_main (insns, rtl_dump_file);
2829 rebuild_jump_labels (insns);
2830 delete_trivially_dead_insns (insns, max_reg_num ());
2832 save_csb = flag_cse_skip_blocks;
2833 save_cfj = flag_cse_follow_jumps;
2834 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2836 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2838 if (flag_expensive_optimizations)
2840 timevar_push (TV_CSE);
2841 reg_scan (insns, max_reg_num (), 1);
2842 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2843 purge_all_dead_edges (0);
2844 delete_trivially_dead_insns (insns, max_reg_num ());
2845 timevar_pop (TV_CSE);
2846 cse_not_expected = !flag_rerun_cse_after_loop;
2849 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2850 things up. Then possibly re-run CSE again. */
2854 timevar_push (TV_JUMP);
2855 rebuild_jump_labels (insns);
2856 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2857 timevar_pop (TV_JUMP);
2859 if (flag_expensive_optimizations)
2861 timevar_push (TV_CSE);
2862 reg_scan (insns, max_reg_num (), 1);
2863 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2864 purge_all_dead_edges (0);
2865 delete_trivially_dead_insns (insns, max_reg_num ());
2866 timevar_pop (TV_CSE);
2870 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2871 timevar_pop (TV_GCSE);
2874 flag_cse_skip_blocks = save_csb;
2875 flag_cse_follow_jumps = save_cfj;
2876 #ifdef ENABLE_CHECKING
2877 verify_flow_info ();
2881 /* Move constant computations out of loops. */
2883 if (optimize > 0 && flag_loop_optimize)
2885 timevar_push (TV_LOOP);
2886 delete_dead_jumptables ();
2887 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2888 open_dump_file (DFI_loop, decl);
2889 /* CFG is no longer maintained up-to-date. */
2890 free_bb_for_insn ();
2892 if (flag_rerun_loop_opt)
2894 cleanup_barriers ();
2896 /* We only want to perform unrolling once. */
2897 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2899 /* The first call to loop_optimize makes some instructions
2900 trivially dead. We delete those instructions now in the
2901 hope that doing so will make the heuristics in loop work
2902 better and possibly speed up compilation. */
2903 delete_trivially_dead_insns (insns, max_reg_num ());
2905 /* The regscan pass is currently necessary as the alias
2906 analysis code depends on this information. */
2907 reg_scan (insns, max_reg_num (), 1);
2909 cleanup_barriers ();
2910 loop_optimize (insns, rtl_dump_file,
2911 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2912 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2914 /* Loop can create trivially dead instructions. */
2915 delete_trivially_dead_insns (insns, max_reg_num ());
2916 close_dump_file (DFI_loop, print_rtl, insns);
2917 timevar_pop (TV_LOOP);
2922 /* Do control and data flow analysis; wrote some of the results to
2925 timevar_push (TV_FLOW);
2926 open_dump_file (DFI_cfg, decl);
2928 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2930 dump_flow_info (rtl_dump_file);
2931 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2932 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2934 /* It may make more sense to mark constant functions after dead code is
2935 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2936 may insert code making function non-constant, but we still must consider
2937 it as constant, otherwise -fbranch-probabilities will not read data back.
2939 life_analyzis rarely eliminates modification of external memory.
2942 mark_constant_function ();
2944 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2946 /* Do branch profiling and static profile estimation passes. */
2947 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
2951 timevar_push (TV_BRANCH_PROB);
2952 open_dump_file (DFI_bp, decl);
2953 if (cfun->arc_profile || flag_branch_probabilities)
2956 /* Discover and record the loop depth at the head of each basic
2957 block. The loop infrastructure does the real job for us. */
2958 flow_loops_find (&loops, LOOP_TREE);
2960 /* Estimate using heuristics if no profiling info is available. */
2961 if (flag_guess_branch_prob)
2962 estimate_probability (&loops);
2965 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2967 flow_loops_free (&loops);
2968 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2969 timevar_pop (TV_BRANCH_PROB);
2973 timevar_push (TV_TRACER);
2974 open_dump_file (DFI_tracer, decl);
2976 dump_flow_info (rtl_dump_file);
2977 cleanup_cfg (CLEANUP_EXPENSIVE);
2979 cleanup_cfg (CLEANUP_EXPENSIVE);
2980 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
2981 timevar_pop (TV_TRACER);
2982 reg_scan (get_insns (), max_reg_num (), 0);
2987 timevar_push (TV_CSE2);
2988 open_dump_file (DFI_cse2, decl);
2990 dump_flow_info (rtl_dump_file);
2992 if (flag_rerun_cse_after_loop)
2994 timevar_push (TV_JUMP);
2996 reg_scan (insns, max_reg_num (), 0);
2998 timevar_push (TV_IFCVT);
2999 cleanup_cfg (CLEANUP_EXPENSIVE);
3000 if (flag_if_conversion)
3002 timevar_pop (TV_IFCVT);
3004 timevar_pop (TV_JUMP);
3005 /* CFG is no longer maintained up-to-date. */
3006 reg_scan (insns, max_reg_num (), 0);
3007 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3008 purge_all_dead_edges (0);
3009 delete_trivially_dead_insns (insns, max_reg_num ());
3013 timevar_push (TV_JUMP);
3014 rebuild_jump_labels (insns);
3015 cleanup_cfg (CLEANUP_EXPENSIVE);
3016 timevar_pop (TV_JUMP);
3020 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3021 timevar_pop (TV_CSE2);
3026 cse_not_expected = 1;
3028 open_dump_file (DFI_life, decl);
3031 check_function_return_warnings ();
3033 #ifdef ENABLE_CHECKING
3034 verify_flow_info ();
3036 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3038 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3039 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3040 timevar_pop (TV_FLOW);
3044 if (warn_uninitialized || extra_warnings)
3046 uninitialized_vars_warning (DECL_INITIAL (decl));
3048 setjmp_args_warning ();
3054 if (initialize_uninitialized_subregs ())
3056 /* Insns were inserted, so things might look a bit different. */
3057 insns = get_insns ();
3058 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3059 PROP_LOG_LINKS | PROP_REG_INFO
3060 | PROP_DEATH_NOTES);
3064 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3068 /* If -opt, try combining insns through substitution. */
3072 int rebuild_jump_labels_after_combine = 0;
3074 timevar_push (TV_COMBINE);
3075 open_dump_file (DFI_combine, decl);
3077 rebuild_jump_labels_after_combine
3078 = combine_instructions (insns, max_reg_num ());
3080 /* Combining insns may have turned an indirect jump into a
3081 direct jump. Rebuid the JUMP_LABEL fields of jumping
3083 if (rebuild_jump_labels_after_combine)
3085 timevar_push (TV_JUMP);
3086 rebuild_jump_labels (insns);
3087 timevar_pop (TV_JUMP);
3089 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3092 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3093 timevar_pop (TV_COMBINE);
3098 /* Rerun if-conversion, as combine may have simplified things enough to
3099 now meet sequence length restrictions. */
3100 if (flag_if_conversion)
3102 timevar_push (TV_IFCVT);
3103 open_dump_file (DFI_ce, decl);
3109 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3110 timevar_pop (TV_IFCVT);
3113 /* Register allocation pre-pass, to reduce number of moves
3114 necessary for two-address machines. */
3115 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3117 timevar_push (TV_REGMOVE);
3118 open_dump_file (DFI_regmove, decl);
3120 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3122 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3123 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3124 timevar_pop (TV_REGMOVE);
3129 /* Do unconditional splitting before register allocation to allow machine
3130 description to add extra information not needed previously. */
3131 split_all_insns (1);
3133 /* Any of the several passes since flow1 will have munged register
3134 lifetime data a bit. */
3135 register_life_up_to_date = 0;
3137 #ifdef OPTIMIZE_MODE_SWITCHING
3138 timevar_push (TV_MODE_SWITCH);
3141 optimize_mode_switching (NULL);
3144 timevar_pop (TV_MODE_SWITCH);
3147 timevar_push (TV_SCHED);
3149 #ifdef INSN_SCHEDULING
3151 /* Print function header into sched dump now
3152 because doing the sched analysis makes some of the dump. */
3153 if (optimize > 0 && flag_schedule_insns)
3155 open_dump_file (DFI_sched, decl);
3157 /* Do control and data sched analysis,
3158 and write some of the results to dump file. */
3160 schedule_insns (rtl_dump_file);
3162 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3164 /* Register lifetime information was updated as part of verifying
3166 register_life_up_to_date = 1;
3169 timevar_pop (TV_SCHED);
3173 /* Determine if the current function is a leaf before running reload
3174 since this can impact optimizations done by the prologue and
3175 epilogue thus changing register elimination offsets. */
3176 current_function_is_leaf = leaf_function_p ();
3178 timevar_push (TV_LOCAL_ALLOC);
3179 open_dump_file (DFI_lreg, decl);
3181 /* Allocate pseudo-regs that are used only within 1 basic block.
3183 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3184 jump optimizer after register allocation and reloading are finished. */
3186 if (! register_life_up_to_date)
3187 recompute_reg_usage (insns, ! optimize_size);
3189 /* Allocate the reg_renumber array. */
3190 allocate_reg_info (max_regno, FALSE, TRUE);
3192 /* And the reg_equiv_memory_loc array. */
3193 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3195 allocate_initial_values (reg_equiv_memory_loc);
3197 regclass (insns, max_reg_num (), rtl_dump_file);
3198 rebuild_label_notes_after_reload = local_alloc ();
3200 timevar_pop (TV_LOCAL_ALLOC);
3202 if (dump_file[DFI_lreg].enabled)
3204 timevar_push (TV_DUMP);
3206 dump_flow_info (rtl_dump_file);
3207 dump_local_alloc (rtl_dump_file);
3209 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3210 timevar_pop (TV_DUMP);
3215 timevar_push (TV_GLOBAL_ALLOC);
3216 open_dump_file (DFI_greg, decl);
3218 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3219 pass fixing up any insns that are invalid. */
3222 failure = global_alloc (rtl_dump_file);
3225 build_insn_chain (insns);
3226 failure = reload (insns, 0);
3229 timevar_pop (TV_GLOBAL_ALLOC);
3231 if (dump_file[DFI_greg].enabled)
3233 timevar_push (TV_DUMP);
3235 dump_global_regs (rtl_dump_file);
3237 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3238 timevar_pop (TV_DUMP);
3242 goto exit_rest_of_compilation;
3246 open_dump_file (DFI_postreload, decl);
3248 /* Do a very simple CSE pass over just the hard registers. */
3251 timevar_push (TV_RELOAD_CSE_REGS);
3252 reload_cse_regs (insns);
3253 timevar_pop (TV_RELOAD_CSE_REGS);
3256 /* Register allocation and reloading may have turned an indirect jump into
3257 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3258 jumping instructions. */
3259 if (rebuild_label_notes_after_reload)
3261 timevar_push (TV_JUMP);
3263 rebuild_jump_labels (insns);
3264 purge_all_dead_edges (0);
3266 timevar_pop (TV_JUMP);
3269 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3271 /* Re-create the death notes which were deleted during reload. */
3272 timevar_push (TV_FLOW2);
3273 open_dump_file (DFI_flow2, decl);
3275 #ifdef ENABLE_CHECKING
3276 verify_flow_info ();
3279 /* If optimizing, then go ahead and split insns now. */
3281 split_all_insns (0);
3283 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3285 /* On some machines, the prologue and epilogue code, or parts thereof,
3286 can be represented as RTL. Doing so lets us schedule insns between
3287 it and the rest of the code and also allows delayed branch
3288 scheduling to operate in the epilogue. */
3289 thread_prologue_and_epilogue_insns (insns);
3293 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3294 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3295 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3297 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3298 even for machines with possibly nonzero RETURN_POPS_ARGS
3299 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3300 push instructions will have popping returns. */
3301 #ifndef PUSH_ROUNDING
3302 if (!ACCUMULATE_OUTGOING_ARGS)
3304 combine_stack_adjustments ();
3309 flow2_completed = 1;
3311 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3312 timevar_pop (TV_FLOW2);
3314 #ifdef HAVE_peephole2
3315 if (optimize > 0 && flag_peephole2)
3317 timevar_push (TV_PEEPHOLE2);
3318 open_dump_file (DFI_peephole2, decl);
3320 peephole2_optimize (rtl_dump_file);
3322 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3323 timevar_pop (TV_PEEPHOLE2);
3327 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3329 timevar_push (TV_RENAME_REGISTERS);
3330 open_dump_file (DFI_rnreg, decl);
3332 if (flag_rename_registers)
3333 regrename_optimize ();
3334 if (flag_cprop_registers)
3335 copyprop_hardreg_forward ();
3337 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3338 timevar_pop (TV_RENAME_REGISTERS);
3341 if (flag_if_conversion2)
3343 timevar_push (TV_IFCVT2);
3344 open_dump_file (DFI_ce2, decl);
3348 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3349 timevar_pop (TV_IFCVT2);
3353 split_all_insns (1);
3356 #ifdef INSN_SCHEDULING
3357 if (optimize > 0 && flag_schedule_insns_after_reload)
3359 timevar_push (TV_SCHED2);
3360 open_dump_file (DFI_sched2, decl);
3362 /* Do control and data sched analysis again,
3363 and write some more of the results to dump file. */
3365 split_all_insns (1);
3367 schedule_insns (rtl_dump_file);
3369 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3370 timevar_pop (TV_SCHED2);
3376 #ifdef LEAF_REGISTERS
3377 current_function_uses_only_leaf_regs
3378 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3382 timevar_push (TV_REG_STACK);
3383 open_dump_file (DFI_stack, decl);
3385 reg_to_stack (insns, rtl_dump_file);
3387 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3388 timevar_pop (TV_REG_STACK);
3394 timevar_push (TV_REORDER_BLOCKS);
3395 open_dump_file (DFI_bbro, decl);
3397 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3398 splitting possibly introduced more crossjumping oppurtuntities.
3399 Except that we can't actually run crossjumping without running
3400 another DCE pass, which we can't do after reg-stack. */
3401 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3402 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3403 if (flag_reorder_blocks)
3405 reorder_basic_blocks ();
3406 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3409 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3410 timevar_pop (TV_REORDER_BLOCKS);
3412 compute_alignments ();
3414 /* CFG is no longer maintained up-to-date. */
3415 free_bb_for_insn ();
3417 /* If a machine dependent reorganization is needed, call it. */
3418 #ifdef MACHINE_DEPENDENT_REORG
3419 timevar_push (TV_MACH_DEP);
3420 open_dump_file (DFI_mach, decl);
3422 MACHINE_DEPENDENT_REORG (insns);
3424 close_dump_file (DFI_mach, print_rtl, insns);
3425 timevar_pop (TV_MACH_DEP);
3430 purge_line_number_notes (insns);
3431 cleanup_barriers ();
3433 /* If a scheduling pass for delayed branches is to be done,
3434 call the scheduling code. */
3437 if (optimize > 0 && flag_delayed_branch)
3439 timevar_push (TV_DBR_SCHED);
3440 open_dump_file (DFI_dbr, decl);
3442 dbr_schedule (insns, rtl_dump_file);
3444 close_dump_file (DFI_dbr, print_rtl, insns);
3445 timevar_pop (TV_DBR_SCHED);
3451 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3452 timevar_push (TV_SHORTEN_BRANCH);
3453 split_all_insns_noflow ();
3454 timevar_pop (TV_SHORTEN_BRANCH);
3457 convert_to_eh_region_ranges ();
3459 /* Shorten branches. */
3460 timevar_push (TV_SHORTEN_BRANCH);
3461 shorten_branches (get_insns ());
3462 timevar_pop (TV_SHORTEN_BRANCH);
3464 current_function_nothrow = nothrow_function_p ();
3465 if (current_function_nothrow)
3466 /* Now we know that this can't throw; set the flag for the benefit
3467 of other functions later in this translation unit. */
3468 TREE_NOTHROW (current_function_decl) = 1;
3470 /* Now turn the rtl into assembler code. */
3472 timevar_push (TV_FINAL);
3477 /* Get the function's name, as described by its RTL. This may be
3478 different from the DECL_NAME name used in the source file. */
3480 x = DECL_RTL (decl);
3481 if (GET_CODE (x) != MEM)
3484 if (GET_CODE (x) != SYMBOL_REF)
3486 fnname = XSTR (x, 0);
3488 assemble_start_function (decl, fnname);
3489 final_start_function (insns, asm_out_file, optimize);
3490 final (insns, asm_out_file, optimize, 0);
3491 final_end_function ();
3493 #ifdef IA64_UNWIND_INFO
3494 /* ??? The IA-64 ".handlerdata" directive must be issued before
3495 the ".endp" directive that closes the procedure descriptor. */
3496 output_function_exception_table ();
3499 assemble_end_function (decl, fnname);
3501 #ifndef IA64_UNWIND_INFO
3502 /* Otherwise, it feels unclean to switch sections in the middle. */
3503 output_function_exception_table ();
3507 fflush (asm_out_file);
3509 /* Release all memory allocated by flow. */
3510 free_basic_block_vars (0);
3512 /* Release all memory held by regsets now. */
3513 regset_release_memory ();
3515 timevar_pop (TV_FINAL);
3519 /* Write DBX symbols if requested. */
3521 /* Note that for those inline functions where we don't initially
3522 know for certain that we will be generating an out-of-line copy,
3523 the first invocation of this routine (rest_of_compilation) will
3524 skip over this code by doing a `goto exit_rest_of_compilation;'.
3525 Later on, finish_compilation will call rest_of_compilation again
3526 for those inline functions that need to have out-of-line copies
3527 generated. During that call, we *will* be routed past here. */
3529 timevar_push (TV_SYMOUT);
3530 (*debug_hooks->function_decl) (decl);
3531 timevar_pop (TV_SYMOUT);
3533 exit_rest_of_compilation:
3535 /* In case the function was not output,
3536 don't leave any temporary anonymous types
3537 queued up for sdb output. */
3538 #ifdef SDB_DEBUGGING_INFO
3539 if (write_symbols == SDB_DEBUG)
3540 sdbout_types (NULL_TREE);
3543 reload_completed = 0;
3544 flow2_completed = 0;
3547 timevar_push (TV_FINAL);
3549 /* Clear out the insn_length contents now that they are no
3551 init_insn_lengths ();
3553 /* Show no temporary slots allocated. */
3556 free_basic_block_vars (0);
3557 free_bb_for_insn ();
3559 timevar_pop (TV_FINAL);
3561 /* Make sure volatile mem refs aren't considered valid operands for
3562 arithmetic insns. We must call this here if this is a nested inline
3563 function, since the above code leaves us in the init_recog state
3564 (from final.c), and the function context push/pop code does not
3565 save/restore volatile_ok.
3567 ??? Maybe it isn't necessary for expand_start_function to call this
3568 anymore if we do it here? */
3570 init_recog_no_volatile ();
3572 /* We're done with this function. Free up memory if we can. */
3573 free_after_parsing (cfun);
3574 if (! DECL_DEFER_OUTPUT (decl))
3576 free_after_compilation (cfun);
3578 /* Clear integrate.c's pointer to the cfun structure we just
3580 DECL_SAVED_INSNS (decl) = 0;
3586 timevar_pop (TV_REST_OF_COMPILATION);
3596 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3597 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3598 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3599 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3600 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3601 printf (_(" -fdiagnostics-show-location=[once | every-line] Indicates how often source location information should be emitted, as prefix, at the beginning of diagnostics when line-wrapping\n"));
3602 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3604 for (i = ARRAY_SIZE (f_options); i--;)
3606 const char *description = f_options[i].description;
3608 if (description != NULL && *description != 0)
3609 printf (" -f%-21s %s\n",
3610 f_options[i].string, _(description));
3613 printf (_(" -O[number] Set optimization level to [number]\n"));
3614 printf (_(" -Os Optimize for space rather than speed\n"));
3615 for (i = LAST_PARAM; i--;)
3617 const char *description = compiler_params[i].help;
3618 const int length = 21 - strlen (compiler_params[i].option);
3620 if (description != NULL && *description != 0)
3621 printf (" --param %s=<value>%.*s%s\n",
3622 compiler_params[i].option,
3623 length > 0 ? length : 1, " ",
3626 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3627 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3628 printf (_(" -w Suppress warnings\n"));
3629 printf (_(" -W Enable extra warnings\n"));
3631 for (i = ARRAY_SIZE (W_options); i--;)
3633 const char *description = W_options[i].description;
3635 if (description != NULL && *description != 0)
3636 printf (" -W%-21s %s\n",
3637 W_options[i].string, _(description));
3640 printf (_(" -Wunused Enable unused warnings\n"));
3641 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3642 printf (_(" -p Enable function profiling\n"));
3643 printf (_(" -o <file> Place output into <file> \n"));
3645 -G <number> Put global and static data smaller than <number>\n\
3646 bytes into a special section (on some targets)\n"));
3648 for (i = ARRAY_SIZE (debug_args); i--;)
3650 if (debug_args[i].description != NULL)
3651 printf (" -g%-21s %s\n",
3652 debug_args[i].arg, _(debug_args[i].description));
3655 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3656 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3657 printf (_(" -version Display the compiler's version\n"));
3658 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3659 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3660 #if defined INSN_SCHEDULING
3661 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3663 printf (_(" --help Display this information\n"));
3668 /* Display descriptions of language specific options.
3669 If there is no description, note that there is an undocumented option.
3670 If the description is empty, do not display anything. (This allows
3671 options to be deliberately undocumented, for whatever reason).
3672 If the option string is missing, then this is a marker, indicating
3673 that the description string is in fact the name of a language, whose
3674 language specific options are to follow. */
3676 if (ARRAY_SIZE (documented_lang_options) > 1)
3678 printf (_("\nLanguage specific options:\n"));
3680 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3682 const char *description = documented_lang_options[i].description;
3683 const char *option = documented_lang_options[i].option;
3685 if (description == NULL)
3690 printf (_(" %-23.23s [undocumented]\n"), option);
3692 else if (*description == 0)
3694 else if (option == NULL)
3698 (_("\nThere are undocumented %s specific options as well.\n"),
3702 printf (_("\n Options for %s:\n"), description);
3707 printf (" %-23.23s %s\n", option, _(description));
3712 printf (_("\nThere are undocumented %s specific options as well.\n"),
3715 display_target_options ();
3719 display_target_options ()
3722 static bool displayed = false;
3724 /* Avoid double printing for --help --target-help. */
3729 if (ARRAY_SIZE (target_switches) > 1
3730 #ifdef TARGET_OPTIONS
3731 || ARRAY_SIZE (target_options) > 1
3739 printf (_("\nTarget specific options:\n"));
3741 for (i = ARRAY_SIZE (target_switches); i--;)
3743 const char *option = target_switches[i].name;
3744 const char *description = target_switches[i].description;
3746 if (option == NULL || *option == 0)
3748 else if (description == NULL)
3753 printf (_(" -m%-23.23s [undocumented]\n"), option);
3755 else if (*description != 0)
3756 doc += printf (" -m%-23.23s %s\n", option, _(description));
3759 #ifdef TARGET_OPTIONS
3760 for (i = ARRAY_SIZE (target_options); i--;)
3762 const char *option = target_options[i].prefix;
3763 const char *description = target_options[i].description;
3765 if (option == NULL || *option == 0)
3767 else if (description == NULL)
3772 printf (_(" -m%-23.23s [undocumented]\n"), option);
3774 else if (*description != 0)
3775 doc += printf (" -m%-23.23s %s\n", option, _(description));
3781 printf (_("\nThere are undocumented target specific options as well.\n"));
3783 printf (_(" They exist, but they are not documented.\n"));
3788 /* Parse a -d... command line switch. */
3791 decode_d_option (arg)
3800 for (i = 0; i < (int) DFI_MAX; ++i)
3801 dump_file[i].enabled = 1;
3807 flag_print_asm_name = 1;
3810 flag_dump_rtl_in_asm = 1;
3811 flag_print_asm_name = 1;
3814 graph_dump_format = vcg;
3817 rtl_dump_and_exit = 1;
3822 case 'D': /* These are handled by the preprocessor. */
3828 for (i = 0; i < (int) DFI_MAX; ++i)
3829 if (c == dump_file[i].debug_switch)
3831 dump_file[i].enabled = 1;
3836 warning ("unrecognized gcc debugging option: %c", c);
3841 /* Parse a -f... command line switch. ARG is the value after the -f.
3842 It is safe to access 'ARG - 2' to generate the full switch name.
3843 Return the number of strings consumed. */
3846 decode_f_option (arg)
3850 const char *option_value = NULL;
3852 /* Search for the option in the table of binary f options. */
3853 for (j = ARRAY_SIZE (f_options); j--;)
3855 if (!strcmp (arg, f_options[j].string))
3857 *f_options[j].variable = f_options[j].on_value;
3861 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3862 && ! strcmp (arg + 3, f_options[j].string))
3864 *f_options[j].variable = ! f_options[j].on_value;
3869 if (!strcmp (arg, "fast-math"))
3870 set_fast_math_flags (1);
3871 else if (!strcmp (arg, "no-fast-math"))
3872 set_fast_math_flags (0);
3873 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3874 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3877 read_integral_parameter (option_value, arg - 2,
3879 set_param_value ("max-inline-insns", val);
3881 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
3883 if (strcmp (option_value, "global-dynamic") == 0)
3884 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
3885 else if (strcmp (option_value, "local-dynamic") == 0)
3886 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
3887 else if (strcmp (option_value, "initial-exec") == 0)
3888 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
3889 else if (strcmp (option_value, "local-exec") == 0)
3890 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
3892 warning ("`%s': unknown tls-model option", arg - 2);
3894 #ifdef INSN_SCHEDULING
3895 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3896 fix_sched_param ("verbose", option_value);
3898 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3899 fix_register (option_value, 1, 1);
3900 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3901 fix_register (option_value, 0, 1);
3902 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3903 fix_register (option_value, 0, 0);
3904 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3905 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3906 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3908 = read_integral_parameter (option_value, arg - 2, align_functions);
3909 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3910 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3911 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3913 = read_integral_parameter (option_value, arg - 2, align_labels);
3914 else if ((option_value
3915 = skip_leading_substring (arg, "stack-limit-register=")))
3917 int reg = decode_reg_name (option_value);
3919 error ("unrecognized register name `%s'", option_value);
3921 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3923 else if ((option_value
3924 = skip_leading_substring (arg, "stack-limit-symbol=")))
3927 nm = ggc_strdup (option_value);
3928 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3930 else if ((option_value
3931 = skip_leading_substring (arg, "message-length=")))
3932 output_set_maximum_length
3933 (&global_dc->buffer, read_integral_parameter
3934 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3935 else if ((option_value
3936 = skip_leading_substring (arg, "diagnostics-show-location=")))
3938 if (!strcmp (option_value, "once"))
3939 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3940 else if (!strcmp (option_value, "every-line"))
3941 diagnostic_prefixing_rule (global_dc)
3942 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3944 error ("unrecognized option `%s'", arg - 2);
3946 else if (!strcmp (arg, "no-stack-limit"))
3947 stack_limit_rtx = NULL_RTX;
3948 else if (!strcmp (arg, "preprocessed"))
3949 /* Recognise this switch but do nothing. This prevents warnings
3950 about an unrecognized switch if cpplib has not been linked in. */
3958 /* Parse a -W... command line switch. ARG is the value after the -W.
3959 It is safe to access 'ARG - 2' to generate the full switch name.
3960 Return the number of strings consumed. */
3963 decode_W_option (arg)
3966 const char *option_value = NULL;
3969 /* Search for the option in the table of binary W options. */
3971 for (j = ARRAY_SIZE (W_options); j--;)
3973 if (!strcmp (arg, W_options[j].string))
3975 *W_options[j].variable = W_options[j].on_value;
3979 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3980 && ! strcmp (arg + 3, W_options[j].string))
3982 *W_options[j].variable = ! W_options[j].on_value;
3987 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3988 warning ("-Wid-clash-LEN is no longer supported");
3989 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3991 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3993 warn_larger_than = larger_than_size != -1;
3995 else if (!strcmp (arg, "unused"))
3999 else if (!strcmp (arg, "no-unused"))
4009 /* Parse a -g... command line switch. ARG is the value after the -g.
4010 It is safe to access 'ARG - 2' to generate the full switch name.
4011 Return the number of strings consumed. */
4014 decode_g_option (arg)
4017 static unsigned level = 0;
4018 /* A lot of code assumes write_symbols == NO_DEBUG if the
4019 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4020 of what debugging type has been selected). This records the
4021 selected type. It is an error to specify more than one
4023 static enum debug_info_type selected_debug_type = NO_DEBUG;
4024 /* Non-zero if debugging format has been explicitly set.
4025 -g and -ggdb don't explicitly set the debugging format so
4026 -gdwarf -g3 is equivalent to -gdwarf3. */
4027 static int type_explicitly_set_p = 0;
4028 /* Indexed by enum debug_info_type. */
4029 static const char *const debug_type_names[] =
4031 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4034 /* The maximum admissible debug level value. */
4035 static const unsigned max_debug_level = 3;
4037 /* Look up ARG in the table. */
4038 for (da = debug_args; da->arg; da++)
4040 const int da_len = strlen (da->arg);
4042 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4044 enum debug_info_type type = da->debug_type;
4045 const char *p = arg + da_len;
4047 if (*p && ! ISDIGIT (*p))
4050 /* A debug flag without a level defaults to level 2.
4051 Note we do not want to call read_integral_parameter
4052 for that case since it will call atoi which
4055 ??? We may want to generalize the interface to
4056 read_integral_parameter to better handle this case
4057 if this case shows up often. */
4059 level = read_integral_parameter (p, 0, max_debug_level + 1);
4061 level = (level == 0) ? 2 : level;
4063 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4065 error ("use -gdwarf -g%d for DWARF v1, level %d",
4068 error ("use -gdwarf-2 for DWARF v2");
4071 if (level > max_debug_level)
4074 ignoring option `%s' due to invalid debug level specification",
4076 level = debug_info_level;
4079 if (type == NO_DEBUG)
4081 type = PREFERRED_DEBUGGING_TYPE;
4083 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4085 #ifdef DWARF2_DEBUGGING_INFO
4086 type = DWARF2_DEBUG;
4088 #ifdef DBX_DEBUGGING_INFO
4095 if (type == NO_DEBUG)
4096 warning ("`%s': unknown or unsupported -g option", arg - 2);
4098 /* Does it conflict with an already selected type? */
4099 if (type_explicitly_set_p
4100 /* -g/-ggdb don't conflict with anything. */
4101 && da->debug_type != NO_DEBUG
4102 && type != selected_debug_type)
4103 warning ("`%s' ignored, conflicts with `-g%s'",
4104 arg - 2, debug_type_names[(int) selected_debug_type]);
4107 /* If the format has already been set, -g/-ggdb
4108 only change the debug level. */
4109 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4110 /* Don't change debugging type. */
4114 selected_debug_type = type;
4115 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4118 write_symbols = (level == 0
4120 : selected_debug_type);
4121 use_gnu_debug_info_extensions = da->use_extensions_p;
4122 debug_info_level = (enum debug_info_level) level;
4135 /* Decode the first argument in the argv as a language-independent option.
4136 Return the number of strings consumed. */
4139 independent_decode_option (argc, argv)
4143 char *arg = argv[0];
4145 if (arg[0] != '-' || arg[1] == 0)
4157 if (!strcmp (arg, "-help"))
4160 exit_after_options = 1;
4163 if (!strcmp (arg, "-target-help"))
4165 display_target_options ();
4166 exit_after_options = 1;
4169 if (!strcmp (arg, "-version"))
4171 print_version (stderr, "");
4172 exit_after_options = 1;
4175 /* Handle '--param <name>=<value>'. */
4176 if (strcmp (arg, "-param") == 0)
4182 error ("-param option missing argument");
4186 /* Get the '<name>=<value>' parameter. */
4188 /* Look for the `='. */
4189 equal = strchr (arg, '=');
4191 error ("invalid --param option: %s", arg);
4196 /* Zero out the `=' sign so that we get two separate strings. */
4198 /* Figure out what value is specified. */
4199 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4200 if (val != INVALID_PARAM_VAL)
4201 set_param_value (arg, val);
4203 error ("invalid parameter value `%s'", equal + 1);
4218 /* Already been treated in main (). Do nothing. */
4222 set_target_switch (arg + 1);
4226 return decode_f_option (arg + 1);
4229 return decode_g_option (arg + 1);
4232 if (!strcmp (arg, "dumpbase"))
4237 dump_base_name = argv[1];
4241 decode_d_option (arg + 1);
4245 if (!strcmp (arg, "pedantic"))
4247 else if (!strcmp (arg, "pedantic-errors"))
4248 flag_pedantic_errors = pedantic = 1;
4249 else if (arg[1] == 0)
4256 if (!strcmp (arg, "quiet"))
4263 if (!strcmp (arg, "version"))
4271 inhibit_warnings = 1;
4280 /* We save the value of warn_uninitialized, since if they put
4281 -Wuninitialized on the command line, we need to generate a
4282 warning about not using it without also specifying -O. */
4283 if (warn_uninitialized != 1)
4284 warn_uninitialized = 2;
4287 return decode_W_option (arg + 1);
4291 if (!strncmp (arg, "aux-info", 8))
4298 aux_info_file_name = argv[1];
4299 flag_gen_aux_info = 1;
4302 else if (arg[8] == '=')
4304 aux_info_file_name = arg + 9;
4305 flag_gen_aux_info = 1;
4320 asm_file_name = argv[1];
4335 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4340 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4344 if (g_switch_val == -1)
4348 g_switch_set = TRUE;
4349 g_switch_value = g_switch_val;
4359 /* Decode -m switches. */
4360 /* Decode the switch -mNAME. */
4363 set_target_switch (name)
4367 int valid_target_option = 0;
4369 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4370 if (!strcmp (target_switches[j].name, name))
4372 if (target_switches[j].value < 0)
4373 target_flags &= ~-target_switches[j].value;
4375 target_flags |= target_switches[j].value;
4376 valid_target_option = 1;
4379 #ifdef TARGET_OPTIONS
4380 if (!valid_target_option)
4381 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4383 int len = strlen (target_options[j].prefix);
4384 if (!strncmp (target_options[j].prefix, name, len))
4386 *target_options[j].variable = name + len;
4387 valid_target_option = 1;
4392 if (!valid_target_option)
4393 error ("invalid option `%s'", name);
4396 /* Print version information to FILE.
4397 Each line begins with INDENT (for the case where FILE is the
4398 assembler output file). */
4401 print_version (file, indent)
4406 #define __VERSION__ "[?]"
4410 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4412 "%s%s%s version %s (%s) compiled by CC.\n"
4414 , indent, *indent != 0 ? " " : "",
4415 lang_hooks.name, version_string, TARGET_NAME,
4416 indent, __VERSION__);
4419 /* Print an option value and return the adjusted position in the line.
4420 ??? We don't handle error returns from fprintf (disk full); presumably
4421 other code will catch a disk full though. */
4424 print_single_switch (file, pos, max, indent, sep, term, type, name)
4427 const char *indent, *sep, *term, *type, *name;
4429 /* The ultrix fprintf returns 0 on success, so compute the result we want
4430 here since we need it for the following test. */
4431 int len = strlen (sep) + strlen (type) + strlen (name);
4436 fprintf (file, "%s", term);
4441 fprintf (file, "%s", indent);
4442 pos = strlen (indent);
4444 fprintf (file, "%s%s%s", sep, type, name);
4449 /* Print active target switches to FILE.
4450 POS is the current cursor position and MAX is the size of a "line".
4451 Each line begins with INDENT and ends with TERM.
4452 Each switch is separated from the next by SEP. */
4455 print_switch_values (file, pos, max, indent, sep, term)
4458 const char *indent, *sep, *term;
4463 /* Print the options as passed. */
4465 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4466 _("options passed: "), "");
4468 for (p = &save_argv[1]; *p != NULL; p++)
4472 if (strcmp (*p, "-o") == 0)
4478 if (strcmp (*p, "-quiet") == 0)
4480 if (strcmp (*p, "-version") == 0)
4485 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4488 fprintf (file, "%s", term);
4490 /* Print the -f and -m options that have been enabled.
4491 We don't handle language specific options but printing argv
4494 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4495 _("options enabled: "), "");
4497 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4498 if (*f_options[j].variable == f_options[j].on_value)
4499 pos = print_single_switch (file, pos, max, indent, sep, term,
4500 "-f", f_options[j].string);
4502 /* Print target specific options. */
4504 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4505 if (target_switches[j].name[0] != '\0'
4506 && target_switches[j].value > 0
4507 && ((target_switches[j].value & target_flags)
4508 == target_switches[j].value))
4510 pos = print_single_switch (file, pos, max, indent, sep, term,
4511 "-m", target_switches[j].name);
4514 #ifdef TARGET_OPTIONS
4515 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4516 if (*target_options[j].variable != NULL)
4519 sprintf (prefix, "-m%s", target_options[j].prefix);
4520 pos = print_single_switch (file, pos, max, indent, sep, term,
4521 prefix, *target_options[j].variable);
4525 fprintf (file, "%s", term);
4528 /* Open assembly code output file. Do this even if -fsyntax-only is
4529 on, because then the driver will have provided the name of a
4530 temporary file or bit bucket for us. NAME is the file specified on
4531 the command line, possibly NULL. */
4533 init_asm_output (name)
4536 if (name == NULL && asm_file_name == 0)
4537 asm_out_file = stdout;
4540 if (asm_file_name == 0)
4542 int len = strlen (dump_base_name);
4543 char *dumpname = (char *) xmalloc (len + 6);
4544 memcpy (dumpname, dump_base_name, len + 1);
4545 strip_off_ending (dumpname, len);
4546 strcat (dumpname, ".s");
4547 asm_file_name = dumpname;
4549 if (!strcmp (asm_file_name, "-"))
4550 asm_out_file = stdout;
4552 asm_out_file = fopen (asm_file_name, "w");
4553 if (asm_out_file == 0)
4554 fatal_io_error ("can't open %s for writing", asm_file_name);
4557 #ifdef IO_BUFFER_SIZE
4558 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4559 _IOFBF, IO_BUFFER_SIZE);
4562 if (!flag_syntax_only)
4564 #ifdef ASM_FILE_START
4565 ASM_FILE_START (asm_out_file);
4568 #ifdef ASM_COMMENT_START
4569 if (flag_verbose_asm)
4571 /* Print the list of options in effect. */
4572 print_version (asm_out_file, ASM_COMMENT_START);
4573 print_switch_values (asm_out_file, 0, MAX_LINE,
4574 ASM_COMMENT_START, " ", "\n");
4575 /* Add a blank line here so it appears in assembler output but not
4577 fprintf (asm_out_file, "\n");
4583 /* Initialization of the front end environment, before command line
4584 options are parsed. Signal handlers, internationalization etc.
4585 ARGV0 is main's argv[0]. */
4587 general_init (argv0)
4592 p = argv0 + strlen (argv0);
4593 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4597 xmalloc_set_program_name (progname);
4599 gcc_init_libintl ();
4601 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4603 signal (SIGSEGV, crash_signal);
4606 signal (SIGILL, crash_signal);
4609 signal (SIGBUS, crash_signal);
4612 signal (SIGABRT, crash_signal);
4614 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4615 signal (SIGIOT, crash_signal);
4618 signal (SIGFPE, crash_signal);
4621 /* Initialize the diagnostics reporting machinery, so option parsing
4622 can give warnings and errors. */
4623 diagnostic_initialize (global_dc);
4626 /* Parse command line options and set default flag values, called
4627 after language-independent option-independent initialization. Do
4628 minimal options processing. Outputting diagnostics is OK, but GC
4629 and identifier hashtables etc. are not initialized yet. */
4631 parse_options_and_default_flags (argc, argv)
4637 /* Save in case md file wants to emit args as a comment. */
4641 /* Initialize register usage now so switches may override. */
4644 /* Register the language-independent parameters. */
4645 add_params (lang_independent_params, LAST_PARAM);
4647 /* Perform language-specific options initialization. */
4648 (*lang_hooks.init_options) ();
4650 /* Scan to see what optimization level has been specified. That will
4651 determine the default value of many flags. */
4652 for (i = 1; i < argc; i++)
4654 if (!strcmp (argv[i], "-O"))
4659 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4661 /* Handle -Os, -O2, -O3, -O69, ... */
4662 char *p = &argv[i][2];
4664 if ((p[0] == 's') && (p[1] == 0))
4668 /* Optimizing for size forces optimize to be 2. */
4673 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4674 if (optimize_val != -1)
4676 optimize = optimize_val;
4685 flag_merge_constants = 0;
4691 flag_thread_jumps = 1;
4693 flag_delayed_branch = 1;
4695 #ifdef CAN_DEBUG_WITHOUT_FP
4696 flag_omit_frame_pointer = 1;
4698 flag_guess_branch_prob = 1;
4699 flag_cprop_registers = 1;
4700 flag_loop_optimize = 1;
4701 flag_crossjumping = 1;
4702 flag_if_conversion = 1;
4703 flag_if_conversion2 = 1;
4708 flag_optimize_sibling_calls = 1;
4709 flag_cse_follow_jumps = 1;
4710 flag_cse_skip_blocks = 1;
4712 flag_expensive_optimizations = 1;
4713 flag_strength_reduce = 1;
4714 flag_rerun_cse_after_loop = 1;
4715 flag_rerun_loop_opt = 1;
4716 flag_caller_saves = 1;
4719 #ifdef INSN_SCHEDULING
4720 flag_schedule_insns = 1;
4721 flag_schedule_insns_after_reload = 1;
4724 flag_strict_aliasing = 1;
4725 flag_delete_null_pointer_checks = 1;
4726 flag_reorder_blocks = 1;
4727 flag_reorder_functions = 1;
4732 flag_inline_functions = 1;
4733 flag_rename_registers = 1;
4736 if (optimize < 2 || optimize_size)
4741 align_functions = 1;
4744 /* Initialize whether `char' is signed. */
4745 flag_signed_char = DEFAULT_SIGNED_CHAR;
4746 #ifdef DEFAULT_SHORT_ENUMS
4747 /* Initialize how much space enums occupy, by default. */
4748 flag_short_enums = DEFAULT_SHORT_ENUMS;
4751 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4754 set_target_switch ("");
4756 /* Unwind tables are always present in an ABI-conformant IA-64
4757 object file, so the default should be ON. */
4758 #ifdef IA64_UNWIND_INFO
4759 flag_unwind_tables = IA64_UNWIND_INFO;
4762 #ifdef OPTIMIZATION_OPTIONS
4763 /* Allow default optimizations to be specified on a per-machine basis. */
4764 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4767 /* Perform normal command line switch decoding. */
4768 for (i = 1; i < argc;)
4771 int indep_processed;
4773 /* Give the language a chance to decode the option for itself. */
4774 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4776 if (lang_processed >= 0)
4777 /* Now see if the option also has a language independent meaning.
4778 Some options are both language specific and language independent,
4780 indep_processed = independent_decode_option (argc - i, argv + i);
4783 lang_processed = -lang_processed;
4784 indep_processed = 0;
4787 if (lang_processed || indep_processed)
4788 i += MAX (lang_processed, indep_processed);
4791 const char *option = NULL;
4792 const char *lang = NULL;
4795 /* It is possible that the command line switch is not valid for the
4796 current language, but it is valid for another language. In order
4797 to be compatible with previous versions of the compiler (which
4798 did not issue an error message in this case) we check for this
4799 possibility here. If we do find a match, then if extra_warnings
4800 is set we generate a warning message, otherwise we will just
4801 ignore the option. */
4802 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4804 option = documented_lang_options[j].option;
4807 lang = documented_lang_options[j].description;
4808 else if (! strncmp (argv[i], option, strlen (option)))
4812 if (j != ARRAY_SIZE (documented_lang_options))
4816 warning ("ignoring command line option '%s'", argv[i]);
4819 ("(it is valid for %s but not the selected language)",
4823 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4824 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4826 error ("unrecognized option `%s'", argv[i]);
4832 if (flag_no_inline == 2)
4835 flag_really_no_inline = flag_no_inline;
4837 /* Set flag_no_inline before the post_options () hook. The C front
4838 ends use it to determine tree inlining defaults. FIXME: such
4839 code should be lang-independent when all front ends use tree
4840 inlining, in which case it, and this condition, should be moved
4841 to the top of process_options() instead. */
4844 /* Inlining does not work if not optimizing,
4845 so force it not to be done. */
4849 /* The c_decode_option function and decode_option hook set
4850 this to `2' if -Wall is used, so we can avoid giving out
4851 lots of errors for people who don't realize what -Wall does. */
4852 if (warn_uninitialized == 1)
4853 warning ("-Wuninitialized is not supported without -O");
4856 if (flag_really_no_inline == 2)
4857 flag_really_no_inline = flag_no_inline;
4859 /* All command line options have been parsed; allow the front end to
4860 perform consistency checks, etc. */
4861 (*lang_hooks.post_options) ();
4864 /* Process the options that have been parsed. */
4868 #ifdef OVERRIDE_OPTIONS
4869 /* Some machines may reject certain combinations of options. */
4873 /* Set up the align_*_log variables, defaulting them to 1 if they
4874 were still unset. */
4875 if (align_loops <= 0) align_loops = 1;
4876 if (align_loops_max_skip > align_loops || !align_loops)
4877 align_loops_max_skip = align_loops - 1;
4878 align_loops_log = floor_log2 (align_loops * 2 - 1);
4879 if (align_jumps <= 0) align_jumps = 1;
4880 if (align_jumps_max_skip > align_jumps || !align_jumps)
4881 align_jumps_max_skip = align_jumps - 1;
4882 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4883 if (align_labels <= 0) align_labels = 1;
4884 align_labels_log = floor_log2 (align_labels * 2 - 1);
4885 if (align_labels_max_skip > align_labels || !align_labels)
4886 align_labels_max_skip = align_labels - 1;
4887 if (align_functions <= 0) align_functions = 1;
4888 align_functions_log = floor_log2 (align_functions * 2 - 1);
4890 /* Unrolling all loops implies that standard loop unrolling must also
4892 if (flag_unroll_all_loops)
4893 flag_unroll_loops = 1;
4894 /* Loop unrolling requires that strength_reduction be on also. Silently
4895 turn on strength reduction here if it isn't already on. Also, the loop
4896 unrolling code assumes that cse will be run after loop, so that must
4897 be turned on also. */
4898 if (flag_unroll_loops)
4900 flag_strength_reduce = 1;
4901 flag_rerun_cse_after_loop = 1;
4904 if (flag_non_call_exceptions)
4905 flag_asynchronous_unwind_tables = 1;
4906 if (flag_asynchronous_unwind_tables)
4907 flag_unwind_tables = 1;
4909 /* Warn about options that are not supported on this machine. */
4910 #ifndef INSN_SCHEDULING
4911 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4912 warning ("instruction scheduling not supported on this target machine");
4915 if (flag_delayed_branch)
4916 warning ("this target machine does not have delayed branches");
4919 user_label_prefix = USER_LABEL_PREFIX;
4920 if (flag_leading_underscore != -1)
4922 /* If the default prefix is more complicated than "" or "_",
4923 issue a warning and ignore this option. */
4924 if (user_label_prefix[0] == 0 ||
4925 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4927 user_label_prefix = flag_leading_underscore ? "_" : "";
4930 warning ("-f%sleading-underscore not supported on this target machine",
4931 flag_leading_underscore ? "" : "no-");
4934 /* If we are in verbose mode, write out the version and maybe all the
4935 option flags in use. */
4938 print_version (stderr, "");
4940 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4946 if (flag_syntax_only)
4948 write_symbols = NO_DEBUG;
4952 /* Now we know write_symbols, set up the debug hooks based on it.
4953 By default we do nothing for debug output. */
4954 #if defined(DBX_DEBUGGING_INFO)
4955 if (write_symbols == DBX_DEBUG)
4956 debug_hooks = &dbx_debug_hooks;
4958 #if defined(XCOFF_DEBUGGING_INFO)
4959 if (write_symbols == XCOFF_DEBUG)
4960 debug_hooks = &xcoff_debug_hooks;
4962 #ifdef SDB_DEBUGGING_INFO
4963 if (write_symbols == SDB_DEBUG)
4964 debug_hooks = &sdb_debug_hooks;
4966 #ifdef DWARF_DEBUGGING_INFO
4967 if (write_symbols == DWARF_DEBUG)
4968 debug_hooks = &dwarf_debug_hooks;
4970 #ifdef DWARF2_DEBUGGING_INFO
4971 if (write_symbols == DWARF2_DEBUG)
4972 debug_hooks = &dwarf2_debug_hooks;
4974 #ifdef VMS_DEBUGGING_INFO
4975 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4976 debug_hooks = &vmsdbg_debug_hooks;
4979 /* If auxiliary info generation is desired, open the output file.
4980 This goes in the same directory as the source file--unlike
4981 all the other output files. */
4982 if (flag_gen_aux_info)
4984 aux_info_file = fopen (aux_info_file_name, "w");
4985 if (aux_info_file == 0)
4986 fatal_io_error ("can't open %s", aux_info_file_name);
4989 if (! targetm.have_named_sections)
4991 if (flag_function_sections)
4993 warning ("-ffunction-sections not supported for this target");
4994 flag_function_sections = 0;
4996 if (flag_data_sections)
4998 warning ("-fdata-sections not supported for this target");
4999 flag_data_sections = 0;
5003 if (flag_function_sections && profile_flag)
5005 warning ("-ffunction-sections disabled; it makes profiling impossible");
5006 flag_function_sections = 0;
5009 #ifndef HAVE_prefetch
5010 if (flag_prefetch_loop_arrays)
5012 warning ("-fprefetch-loop-arrays not supported for this target");
5013 flag_prefetch_loop_arrays = 0;
5016 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5018 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5019 flag_prefetch_loop_arrays = 0;
5023 /* This combination of options isn't handled for i386 targets and doesn't
5024 make much sense anyway, so don't allow it. */
5025 if (flag_prefetch_loop_arrays && optimize_size)
5027 warning ("-fprefetch-loop-arrays is not supported with -Os");
5028 flag_prefetch_loop_arrays = 0;
5031 #ifndef OBJECT_FORMAT_ELF
5032 if (flag_function_sections && write_symbols != NO_DEBUG)
5033 warning ("-ffunction-sections may affect debugging on some targets");
5037 /* Language-independent initialization, before language-dependent
5040 lang_independent_init ()
5042 /* Initialize the garbage-collector, and string pools. */
5044 ggc_add_rtx_root (&stack_limit_rtx, 1);
5045 ggc_add_tree_root (¤t_function_decl, 1);
5046 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5051 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5052 || debug_info_level == DINFO_LEVEL_VERBOSE
5053 #ifdef VMS_DEBUGGING_INFO
5054 /* Enable line number info for traceback */
5055 || debug_info_level > DINFO_LEVEL_NONE
5057 || flag_test_coverage
5058 || warn_notreached);
5064 init_function_once ();
5065 init_stor_layout_once ();
5066 init_varasm_once ();
5067 init_EXPR_INSN_LIST_cache ();
5069 /* The following initialization functions need to generate rtl, so
5070 provide a dummy function context for them. */
5071 init_dummy_function_start ();
5073 if (flag_caller_saves)
5074 init_caller_save ();
5075 expand_dummy_function_end ();
5078 /* Language-dependent initialization. Returns non-zero on success. */
5080 lang_dependent_init (name)
5083 if (dump_base_name == 0)
5084 dump_base_name = name ? name : "gccdump";
5086 /* Front-end initialization. This hook can assume that GC,
5087 identifier hashes etc. are set up, but debug initialization is
5088 not done yet. This routine must return the original filename
5089 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5090 name = (*lang_hooks.init) (name);
5094 /* Is this duplication necessary? */
5095 name = ggc_strdup (name);
5096 main_input_filename = input_filename = name;
5097 init_asm_output (name);
5099 /* These create various _DECL nodes, so need to be called after the
5100 front end is initialized. */
5105 /* Put an entry on the input file stack for the main input file. */
5106 push_srcloc (input_filename, 0);
5108 /* If dbx symbol table desired, initialize writing it and output the
5109 predefined types. */
5110 timevar_push (TV_SYMOUT);
5112 #ifdef DWARF2_UNWIND_INFO
5113 if (dwarf2out_do_frame ())
5114 dwarf2out_frame_init ();
5117 /* Now we have the correct original filename, we can initialize
5119 (*debug_hooks->init) (name);
5121 timevar_pop (TV_SYMOUT);
5126 /* Clean up: close opened files, etc. */
5131 /* Close the dump files. */
5132 if (flag_gen_aux_info)
5134 fclose (aux_info_file);
5136 unlink (aux_info_file_name);
5139 /* Close non-debugging input and output files. Take special care to note
5140 whether fclose returns an error, since the pages might still be on the
5141 buffer chain while the file is open. */
5145 if (ferror (asm_out_file) != 0)
5146 fatal_io_error ("error writing to %s", asm_file_name);
5147 if (fclose (asm_out_file) != 0)
5148 fatal_io_error ("error closing %s", asm_file_name);
5151 /* Do whatever is necessary to finish printing the graphs. */
5152 if (graph_dump_format != no_graph)
5156 for (i = 0; i < (int) DFI_MAX; ++i)
5157 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5162 sprintf (seq, DUMPFILE_FORMAT, i);
5163 suffix = concat (seq, dump_file[i].extension, NULL);
5164 finish_graph_dump_file (dump_base_name, suffix);
5171 ggc_print_statistics ();
5172 stringpool_statistics ();
5173 dump_tree_statistics ();
5176 /* Free up memory for the benefit of leak detectors. */
5179 /* Language-specific end of compilation actions. */
5180 (*lang_hooks.finish) ();
5183 /* Initialize the compiler, and compile the input file. */
5187 /* The bulk of command line switch processing. */
5190 /* We cannot start timing until after options are processed since that
5191 says if we run timers or not. */
5193 timevar_start (TV_TOTAL);
5195 /* Language-independent initialization. Also sets up GC, identifier
5197 lang_independent_init ();
5199 /* Language-dependent initialization. Returns true on success. */
5200 if (lang_dependent_init (filename))
5205 /* Stop timing and print the times. */
5206 timevar_stop (TV_TOTAL);
5207 timevar_print (stderr);
5210 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5211 Decode command args, then call compile_file.
5212 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5213 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5215 It is not safe to call this function more than once. */
5218 toplev_main (argc, argv)
5224 /* Initialization of GCC's environment, and diagnostics. */
5225 general_init (argv[0]);
5227 /* Parse the options and do minimal processing; basically just
5228 enough to default flags appropriately. */
5229 parse_options_and_default_flags (argc, argv);
5231 /* Exit early if we can (e.g. -help). */
5232 if (!errorcount && !exit_after_options)
5235 if (errorcount || sorrycount)
5236 return (FATAL_EXIT_CODE);
5238 return (SUCCESS_EXIT_CODE);