1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
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"
74 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
75 #include "dwarf2out.h"
78 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
82 #ifdef SDB_DEBUGGING_INFO
86 #ifdef XCOFF_DEBUGGING_INFO
87 #include "xcoffout.h" /* Needed for external data
88 declarations for e.g. AIX 4.x. */
95 /* Carry information from ASM_DECLARE_OBJECT_NAME
96 to ASM_FINISH_DECLARE_OBJECT. */
98 extern int size_directive_output;
99 extern tree last_assemble_variable_decl;
101 static void general_init PARAMS ((char *));
102 static void parse_options_and_default_flags PARAMS ((int, char **));
103 static void do_compile PARAMS ((void));
104 static void process_options PARAMS ((void));
105 static void lang_independent_init PARAMS ((void));
106 static int lang_dependent_init PARAMS ((const char *));
107 static void init_asm_output PARAMS ((const char *));
108 static void finalize PARAMS ((void));
110 static void set_target_switch PARAMS ((const char *));
112 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
113 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
114 static void set_float_handler PARAMS ((jmp_buf));
115 static void compile_file PARAMS ((void));
116 static void display_help PARAMS ((void));
117 static void display_target_options PARAMS ((void));
119 static void decode_d_option PARAMS ((const char *));
120 static int decode_f_option PARAMS ((const char *));
121 static int decode_W_option PARAMS ((const char *));
122 static int decode_g_option PARAMS ((const char *));
123 static unsigned int independent_decode_option PARAMS ((int, char **));
125 static void print_version PARAMS ((FILE *, const char *));
126 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
127 const char *, const char *,
128 const char *, const char *));
129 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
130 const char *, const char *));
132 /* Length of line when printing switch values. */
135 /* Name of program invoked, sans directories. */
137 const char *progname;
139 /* Copy of arguments to toplev_main. */
143 /* Name of current original source file (what was input to cpp).
144 This comes from each #-command in the actual input. */
146 const char *input_filename;
148 /* Name of top-level original source file (what was input to cpp).
149 This comes from the #-command at the beginning of the actual input.
150 If there isn't any there, then this is the cc1 input file name. */
152 const char *main_input_filename;
154 /* Current line number in real source file. */
158 /* Nonzero if it is unsafe to create any new pseudo registers. */
161 /* Stack of currently pending input files. */
163 struct file_stack *input_file_stack;
165 /* Incremented on each change to input_file_stack. */
166 int input_file_stack_tick;
168 /* Name to use as base of names for dump output files. */
170 const char *dump_base_name;
172 /* Format to use to print dumpfile index value */
173 #ifndef DUMPFILE_FORMAT
174 #define DUMPFILE_FORMAT ".%02d."
177 /* Bit flags that specify the machine subtype we are compiling for.
178 Bits are tested using macros TARGET_... defined in the tm.h file
179 and set by `-m...' switches. Must be defined in rtlanal.c. */
181 extern int target_flags;
183 /* Debug hooks - dependent upon command line options. */
185 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
187 /* Describes a dump file. */
189 struct dump_file_info
191 /* The unique extension to apply, e.g. ".jump". */
192 const char *const extension;
194 /* The -d<c> character that enables this dump file. */
195 char const debug_switch;
197 /* True if there is a corresponding graph dump file. */
198 char const graph_dump_p;
200 /* True if the user selected this dump. */
203 /* True if the files have been initialized (ie truncated). */
207 /* Enumerate the extant dump files. */
247 /* Describes all the dump files. Should be kept in order of the
248 pass and in sync with dump_file_index above.
250 Remaining -d letters:
256 static struct dump_file_info dump_file[DFI_MAX] =
258 { "rtl", 'r', 0, 0, 0 },
259 { "sibling", 'i', 0, 0, 0 },
260 { "eh", 'h', 0, 0, 0 },
261 { "jump", 'j', 0, 0, 0 },
262 { "ssa", 'e', 1, 0, 0 },
263 { "ssaccp", 'W', 1, 0, 0 },
264 { "ssadce", 'X', 1, 0, 0 },
265 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
266 { "null", 'u', 0, 0, 0 },
267 { "cse", 's', 0, 0, 0 },
268 { "addressof", 'F', 0, 0, 0 },
269 { "gcse", 'G', 1, 0, 0 },
270 { "loop", 'L', 1, 0, 0 },
271 { "cfg", 'f', 1, 0, 0 },
272 { "bp", 'b', 1, 0, 0 },
273 { "cse2", 't', 1, 0, 0 },
274 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
275 { "combine", 'c', 1, 0, 0 },
276 { "ce", 'C', 1, 0, 0 },
277 { "regmove", 'N', 1, 0, 0 },
278 { "sched", 'S', 1, 0, 0 },
279 { "lreg", 'l', 1, 0, 0 },
280 { "greg", 'g', 1, 0, 0 },
281 { "postreload", 'o', 1, 0, 0 },
282 { "flow2", 'w', 1, 0, 0 },
283 { "peephole2", 'z', 1, 0, 0 },
284 { "rnreg", 'n', 1, 0, 0 },
285 { "ce2", 'E', 1, 0, 0 },
286 { "sched2", 'R', 1, 0, 0 },
287 { "stack", 'k', 1, 0, 0 },
288 { "bbro", 'B', 1, 0, 0 },
289 { "mach", 'M', 1, 0, 0 },
290 { "dbr", 'd', 0, 0, 0 },
293 static int open_dump_file PARAMS ((enum dump_file_index, tree));
294 static void close_dump_file PARAMS ((enum dump_file_index,
295 void (*) (FILE *, rtx), rtx));
297 /* Other flags saying which kinds of debugging dump have been requested. */
299 int rtl_dump_and_exit;
300 int flag_print_asm_name;
301 static int version_flag;
302 static char *filename;
303 enum graph_dump_types graph_dump_format;
305 /* Name for output file of assembly code, specified with -o. */
309 /* Value of the -G xx switch, and whether it was passed or not. */
313 /* Type(s) of debugging information we are producing (if any).
314 See flags.h for the definitions of the different possible
315 types of debugging information. */
316 enum debug_info_type write_symbols = NO_DEBUG;
318 /* Level of debugging information we are producing. See flags.h
319 for the definitions of the different possible levels. */
320 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
322 /* Nonzero means use GNU-only extensions in the generated symbolic
323 debugging information. */
324 /* Currently, this only has an effect when write_symbols is set to
325 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
326 int use_gnu_debug_info_extensions = 0;
328 /* Nonzero means do optimizations. -O.
329 Particular numeric values stand for particular amounts of optimization;
330 thus, -O2 stores 2 here. However, the optimizations beyond the basic
331 ones are not controlled directly by this variable. Instead, they are
332 controlled by individual `flag_...' variables that are defaulted
333 based on this variable. */
337 /* Nonzero means optimize for size. -Os.
338 The only valid values are zero and non-zero. When optimize_size is
339 non-zero, optimize defaults to 2, but certain individual code
340 bloating optimizations are disabled. */
342 int optimize_size = 0;
344 /* Nonzero if we should exit after parsing options. */
345 static int exit_after_options = 0;
347 /* The FUNCTION_DECL for the function currently being compiled,
348 or 0 if between functions. */
349 tree current_function_decl;
351 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
353 tree current_function_func_begin_label;
355 /* Pointer to function to compute rtl for a language-specific tree code. */
357 typedef rtx (*lang_expand_expr_t)
358 PARAMS ((union tree_node *, rtx, enum machine_mode,
359 enum expand_modifier modifier));
361 lang_expand_expr_t lang_expand_expr = 0;
363 /* Pointer to function to finish handling an incomplete decl at the
364 end of compilation. */
366 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
368 /* Nonzero if doing dwarf2 duplicate elimination. */
370 int flag_eliminate_dwarf2_dups = 0;
372 /* Nonzero if generating code to do profiling. */
374 int profile_flag = 0;
376 /* Nonzero if generating code to profile program flow graph arcs. */
378 int profile_arc_flag = 0;
380 /* Nonzero if generating info for gcov to calculate line test coverage. */
382 int flag_test_coverage = 0;
384 /* Nonzero indicates that branch taken probabilities should be calculated. */
386 int flag_branch_probabilities = 0;
388 /* Nonzero if basic blocks should be reordered. */
390 int flag_reorder_blocks = 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 to use global dataflow analysis to eliminate
617 useless null pointer tests. */
619 static int flag_delete_null_pointer_checks;
621 /* Nonzero means to do the enhanced load motion during gcse, which trys
622 to hoist loads by not killing them when a store to the same location
625 int flag_gcse_lm = 1;
627 /* Nonzero means to perform store motion after gcse, which will try to
628 move stores closer to the exit block. Its not very effective without
631 int flag_gcse_sm = 1;
633 /* Nonzero means to rerun cse after loop optimization. This increases
634 compilation time about 20% and picks up a few more common expressions. */
636 static int flag_rerun_cse_after_loop;
638 /* Nonzero means to run loop optimizations twice. */
640 int flag_rerun_loop_opt;
642 /* Nonzero for -finline-functions: ok to inline functions that look like
643 good inline candidates. */
645 int flag_inline_functions;
647 /* Nonzero for -fkeep-inline-functions: even if we make a function
648 go inline everywhere, keep its definition around for debugging
651 int flag_keep_inline_functions;
653 /* Nonzero means that functions will not be inlined. */
657 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
658 not just because the tree inliner turned us off. */
660 int flag_really_no_inline;
662 /* Nonzero means that we should emit static const variables
663 regardless of whether or not optimization is turned on. */
665 int flag_keep_static_consts = 1;
667 /* Nonzero means we should be saving declaration info into a .X file. */
669 int flag_gen_aux_info = 0;
671 /* Specified name of aux-info file. */
673 static char *aux_info_file_name;
675 /* Nonzero means make the text shared if supported. */
677 int flag_shared_data;
679 /* Nonzero means schedule into delayed branch slots if supported. */
681 int flag_delayed_branch;
683 /* Nonzero if we are compiling pure (sharable) code.
684 Value is 1 if we are doing reasonable (i.e. simple
685 offset into offset table) pic. Value is 2 if we can
686 only perform register offsets. */
690 /* Nonzero means generate extra code for exception handling and enable
691 exception handling. */
695 /* Nonzero means generate frame unwind info table when supported. */
697 int flag_unwind_tables = 0;
699 /* Nonzero means generate frame unwind info table exact at each insn boundary */
701 int flag_asynchronous_unwind_tables = 0;
703 /* Nonzero means don't place uninitialized global data in common storage
708 /* Nonzero means change certain warnings into errors.
709 Usually these are warnings about failure to conform to some standard. */
711 int flag_pedantic_errors = 0;
713 /* flag_schedule_insns means schedule insns within basic blocks (before
715 flag_schedule_insns_after_reload means schedule insns after
718 int flag_schedule_insns = 0;
719 int flag_schedule_insns_after_reload = 0;
721 /* The following flags have effect only for scheduling before register
724 flag_schedule_interblock means schedule insns accross basic blocks.
725 flag_schedule_speculative means allow speculative motion of non-load insns.
726 flag_schedule_speculative_load means allow speculative motion of some
728 flag_schedule_speculative_load_dangerous allows speculative motion of more
731 int flag_schedule_interblock = 1;
732 int flag_schedule_speculative = 1;
733 int flag_schedule_speculative_load = 0;
734 int flag_schedule_speculative_load_dangerous = 0;
736 int flag_single_precision_constant;
738 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
739 by a cheaper branch on a count register. */
740 int flag_branch_on_count_reg = 1;
742 /* -finhibit-size-directive inhibits output of .size for ELF.
743 This is used only for compiling crtstuff.c,
744 and it may be extended to other effects
745 needed for crtstuff.c on other systems. */
746 int flag_inhibit_size_directive = 0;
748 /* -fverbose-asm causes extra commentary information to be produced in
749 the generated assembly code (to make it more readable). This option
750 is generally only of use to those who actually need to read the
751 generated assembly code (perhaps while debugging the compiler itself).
752 -fno-verbose-asm, the default, causes the extra information
753 to be omitted and is useful when comparing two assembler files. */
755 int flag_verbose_asm = 0;
757 /* -dA causes debug commentary information to be produced in
758 the generated assembly code (to make it more readable). This option
759 is generally only of use to those who actually need to read the
760 generated assembly code (perhaps while debugging the compiler itself).
761 Currently, this switch is only used by dwarfout.c; however, it is intended
762 to be a catchall for printing debug information in the assembler file. */
764 int flag_debug_asm = 0;
766 /* -dP causes the rtl to be emitted as a comment in assembly. */
768 int flag_dump_rtl_in_asm = 0;
770 /* -fgnu-linker specifies use of the GNU linker for initializations.
771 (Or, more generally, a linker that handles initializations.)
772 -fno-gnu-linker says that collect2 will be used. */
774 int flag_gnu_linker = 0;
776 int flag_gnu_linker = 1;
779 /* Nonzero means put zero initialized data in the bss section. */
780 int flag_zero_initialized_in_bss = 1;
785 /* Enable ssa conditional constant propagation. */
786 int flag_ssa_ccp = 0;
788 /* Enable ssa aggressive dead code elimination. */
789 int flag_ssa_dce = 0;
791 /* Tag all structures with __attribute__(packed). */
792 int flag_pack_struct = 0;
794 /* Emit code to check for stack overflow; also may cause large objects
795 to be allocated dynamically. */
796 int flag_stack_check;
798 /* When non-NULL, indicates that whenever space is allocated on the
799 stack, the resulting stack pointer must not pass this
800 address---that is, for stacks that grow downward, the stack pointer
801 must always be greater than or equal to this address; for stacks
802 that grow upward, the stack pointer must be less than this address.
803 At present, the rtx may be either a REG or a SYMBOL_REF, although
804 the support provided depends on the backend. */
807 /* 0 if pointer arguments may alias each other. True in C.
808 1 if pointer arguments may not alias each other but may alias
810 2 if pointer arguments may not alias each other and may not
811 alias global variables. True in Fortran.
812 This defaults to 0 for C. */
813 int flag_argument_noalias = 0;
815 /* Nonzero if we should do (language-dependent) alias analysis.
816 Typically, this analysis will assume that expressions of certain
817 types do not alias expressions of certain other types. Only used
818 if alias analysis (in general) is enabled. */
819 int flag_strict_aliasing = 0;
821 /* Instrument functions with calls at entry and exit, for profiling. */
822 int flag_instrument_function_entry_exit = 0;
824 /* Nonzero means ignore `#ident' directives. 0 means handle them.
825 On SVR4 targets, it also controls whether or not to emit a
826 string identifying the compiler. */
828 int flag_no_ident = 0;
830 /* This will perform a peephole pass before sched2. */
831 int flag_peephole2 = 0;
833 /* This will try to guess branch probabilities. */
834 int flag_guess_branch_prob = 0;
836 /* -fbounded-pointers causes gcc to compile pointers as composite
837 objects occupying three words: the pointer value, the base address
838 of the referent object, and the address immediately beyond the end
839 of the referent object. The base and extent allow us to perform
840 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
841 int flag_bounded_pointers = 0;
843 /* -fcheck-bounds causes gcc to generate array bounds checks.
844 For C, C++: defaults to value of flag_bounded_pointers.
845 For ObjC: defaults to off.
846 For Java: defaults to on.
847 For Fortran: defaults to off.
848 For CHILL: defaults to off. */
849 int flag_bounds_check = 0;
851 /* This will attempt to merge constant section constants, if 1 only
852 string constants and constants from constant pool, if 2 also constant
854 int flag_merge_constants = 1;
856 /* If one, renumber instruction UIDs to reduce the number of
857 unused UIDs if there are a lot of instructions. If greater than
858 one, unconditionally renumber instruction UIDs. */
859 int flag_renumber_insns = 1;
861 /* Values of the -falign-* flags: how much to align labels in code.
862 0 means `use default', 1 means `don't align'.
863 For each variable, there is an _log variant which is the power
864 of two not less than the variable, for .align output. */
868 int align_loops_max_skip;
871 int align_jumps_max_skip;
873 int align_labels_log;
874 int align_labels_max_skip;
876 int align_functions_log;
878 /* Table of supported debugging formats. */
881 const char *const arg;
882 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
883 constant expression, we use NO_DEBUG in its place. */
884 const enum debug_info_type debug_type;
885 const int use_extensions_p;
886 const char *const description;
890 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
891 N_("Generate debugging info in default format") },
892 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
893 #ifdef DBX_DEBUGGING_INFO
894 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
895 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
897 #ifdef DWARF_DEBUGGING_INFO
898 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
899 { "dwarf+", DWARF_DEBUG, 1,
900 N_("Generate extended DWARF-1 format debug info") },
902 #ifdef DWARF2_DEBUGGING_INFO
903 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
905 #ifdef XCOFF_DEBUGGING_INFO
906 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
907 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
909 #ifdef SDB_DEBUGGING_INFO
910 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
912 #ifdef VMS_DEBUGGING_INFO
913 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
920 const char *const string;
923 const char *const description;
925 lang_independent_options;
929 /* Add or remove a leading underscore from user symbols. */
930 int flag_leading_underscore = -1;
932 /* The user symbol prefix after having resolved same. */
933 const char *user_label_prefix;
935 static const param_info lang_independent_params[] = {
936 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
937 { OPTION, DEFAULT, HELP },
938 #include "params.def"
943 /* A default for same. */
944 #ifndef USER_LABEL_PREFIX
945 #define USER_LABEL_PREFIX ""
948 /* Table of language-independent -f options.
949 STRING is the option name. VARIABLE is the address of the variable.
950 ON_VALUE is the value to store in VARIABLE
951 if `-fSTRING' is seen as an option.
952 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
954 static const lang_independent_options f_options[] =
956 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
957 N_("Perform DWARF2 duplicate elimination") },
958 {"float-store", &flag_float_store, 1,
959 N_("Do not store floats in registers") },
960 {"volatile", &flag_volatile, 1,
961 N_("Consider all mem refs through pointers as volatile") },
962 {"volatile-global", &flag_volatile_global, 1,
963 N_("Consider all mem refs to global data to be volatile") },
964 {"volatile-static", &flag_volatile_static, 1,
965 N_("Consider all mem refs to static data to be volatile") },
966 {"defer-pop", &flag_defer_pop, 1,
967 N_("Defer popping functions args from stack until later") },
968 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
969 N_("When possible do not generate stack frames") },
970 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
971 N_("Optimize sibling and tail recursive calls") },
972 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
973 N_("When running CSE, follow jumps to their targets") },
974 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
975 N_("When running CSE, follow conditional jumps") },
976 {"expensive-optimizations", &flag_expensive_optimizations, 1,
977 N_("Perform a number of minor, expensive optimizations") },
978 {"thread-jumps", &flag_thread_jumps, 1,
979 N_("Perform jump threading optimizations") },
980 {"strength-reduce", &flag_strength_reduce, 1,
981 N_("Perform strength reduction optimizations") },
982 {"unroll-loops", &flag_unroll_loops, 1,
983 N_("Perform loop unrolling when iteration count is known") },
984 {"unroll-all-loops", &flag_unroll_all_loops, 1,
985 N_("Perform loop unrolling for all loops") },
986 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
987 N_("Generate prefetch instructions, if available, for arrays in loops") },
988 {"move-all-movables", &flag_move_all_movables, 1,
989 N_("Force all loop invariant computations out of loops") },
990 {"reduce-all-givs", &flag_reduce_all_givs, 1,
991 N_("Strength reduce all loop general induction variables") },
992 {"writable-strings", &flag_writable_strings, 1,
993 N_("Store strings in writable data section") },
994 {"peephole", &flag_no_peephole, 0,
995 N_("Enable machine specific peephole optimizations") },
996 {"force-mem", &flag_force_mem, 1,
997 N_("Copy memory operands into registers before using") },
998 {"force-addr", &flag_force_addr, 1,
999 N_("Copy memory address constants into regs before using") },
1000 {"function-cse", &flag_no_function_cse, 0,
1001 N_("Allow function addresses to be held in registers") },
1002 {"inline-functions", &flag_inline_functions, 1,
1003 N_("Integrate simple functions into their callers") },
1004 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1005 N_("Generate code for funcs even if they are fully inlined") },
1006 {"inline", &flag_no_inline, 0,
1007 N_("Pay attention to the 'inline' keyword") },
1008 {"keep-static-consts", &flag_keep_static_consts, 1,
1009 N_("Emit static const variables even if they are not used") },
1010 {"syntax-only", &flag_syntax_only, 1,
1011 N_("Check for syntax errors, then stop") },
1012 {"shared-data", &flag_shared_data, 1,
1013 N_("Mark data as shared rather than private") },
1014 {"caller-saves", &flag_caller_saves, 1,
1015 N_("Enable saving registers around function calls") },
1016 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1017 N_("Return 'short' aggregates in memory, not registers") },
1018 {"reg-struct-return", &flag_pcc_struct_return, 0,
1019 N_("Return 'short' aggregates in registers") },
1020 {"delayed-branch", &flag_delayed_branch, 1,
1021 N_("Attempt to fill delay slots of branch instructions") },
1022 {"gcse", &flag_gcse, 1,
1023 N_("Perform the global common subexpression elimination") },
1024 {"gcse-lm", &flag_gcse_lm, 1,
1025 N_("Perform enhanced load motion during global subexpression elimination") },
1026 {"gcse-sm", &flag_gcse_sm, 1,
1027 N_("Perform store motion after global subexpression elimination") },
1028 {"loop-optimize", &flag_loop_optimize, 1,
1029 N_("Perform the loop optimizations") },
1030 {"crossjumping", &flag_crossjumping, 1,
1031 N_("Perform cross-jumping optimization") },
1032 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1033 N_("Run CSE pass after loop optimizations") },
1034 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1035 N_("Run the loop optimizer twice") },
1036 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1037 N_("Delete useless null pointer checks") },
1038 {"schedule-insns", &flag_schedule_insns, 1,
1039 N_("Reschedule instructions before register allocation") },
1040 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1041 N_("Reschedule instructions after register allocation") },
1042 {"sched-interblock",&flag_schedule_interblock, 1,
1043 N_("Enable scheduling across basic blocks") },
1044 {"sched-spec",&flag_schedule_speculative, 1,
1045 N_("Allow speculative motion of non-loads") },
1046 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1047 N_("Allow speculative motion of some loads") },
1048 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1049 N_("Allow speculative motion of more loads") },
1050 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1051 N_("Replace add,compare,branch with branch on count reg") },
1052 {"pic", &flag_pic, 1,
1053 N_("Generate position independent code, if possible") },
1054 {"PIC", &flag_pic, 2, ""},
1055 {"exceptions", &flag_exceptions, 1,
1056 N_("Enable exception handling") },
1057 {"unwind-tables", &flag_unwind_tables, 1,
1058 N_("Just generate unwind tables for exception handling") },
1059 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1060 N_("Generate unwind tables exact at each instruction boundary") },
1061 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1062 N_("Support synchronous non-call exceptions") },
1063 {"profile-arcs", &profile_arc_flag, 1,
1064 N_("Insert arc based program profiling code") },
1065 {"test-coverage", &flag_test_coverage, 1,
1066 N_("Create data files needed by gcov") },
1067 {"branch-probabilities", &flag_branch_probabilities, 1,
1068 N_("Use profiling information for branch probabilities") },
1069 {"reorder-blocks", &flag_reorder_blocks, 1,
1070 N_("Reorder basic blocks to improve code placement") },
1071 {"rename-registers", &flag_rename_registers, 1,
1072 N_("Do the register renaming optimization pass") },
1073 {"cprop-registers", &flag_cprop_registers, 1,
1074 N_("Do the register copy-propagation optimization pass") },
1075 {"common", &flag_no_common, 0,
1076 N_("Do not put uninitialized globals in the common section") },
1077 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1078 N_("Do not generate .size directives") },
1079 {"function-sections", &flag_function_sections, 1,
1080 N_("place each function into its own section") },
1081 {"data-sections", &flag_data_sections, 1,
1082 N_("place data items into their own section") },
1083 {"verbose-asm", &flag_verbose_asm, 1,
1084 N_("Add extra commentry to assembler output") },
1085 {"gnu-linker", &flag_gnu_linker, 1,
1086 N_("Output GNU ld formatted global initializers") },
1087 {"regmove", &flag_regmove, 1,
1088 N_("Enables a register move optimization") },
1089 {"optimize-register-move", &flag_regmove, 1,
1090 N_("Do the full regmove optimization pass") },
1091 {"pack-struct", &flag_pack_struct, 1,
1092 N_("Pack structure members together without holes") },
1093 {"stack-check", &flag_stack_check, 1,
1094 N_("Insert stack checking code into the program") },
1095 {"argument-alias", &flag_argument_noalias, 0,
1096 N_("Specify that arguments may alias each other & globals") },
1097 {"argument-noalias", &flag_argument_noalias, 1,
1098 N_("Assume arguments may alias globals but not each other") },
1099 {"argument-noalias-global", &flag_argument_noalias, 2,
1100 N_("Assume arguments do not alias each other or globals") },
1101 {"strict-aliasing", &flag_strict_aliasing, 1,
1102 N_("Assume strict aliasing rules apply") },
1103 {"align-loops", &align_loops, 0,
1104 N_("Align the start of loops") },
1105 {"align-jumps", &align_jumps, 0,
1106 N_("Align labels which are only reached by jumping") },
1107 {"align-labels", &align_labels, 0,
1108 N_("Align all labels") },
1109 {"align-functions", &align_functions, 0,
1110 N_("Align the start of functions") },
1111 {"merge-constants", &flag_merge_constants, 1,
1112 N_("Attempt to merge identical constants accross compilation units") },
1113 {"merge-all-constants", &flag_merge_constants, 2,
1114 N_("Attempt to merge identical constants and constant variables") },
1115 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1116 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1117 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1118 N_("Instrument function entry/exit with profiling calls") },
1119 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1120 N_("Put zero initialized data in the bss section") },
1121 {"ssa", &flag_ssa, 1,
1122 N_("Enable SSA optimizations") },
1123 {"ssa-ccp", &flag_ssa_ccp, 1,
1124 N_("Enable SSA conditional constant propagation") },
1125 {"ssa-dce", &flag_ssa_dce, 1,
1126 N_("Enable aggressive SSA dead code elimination") },
1127 {"leading-underscore", &flag_leading_underscore, 1,
1128 N_("External symbols have a leading underscore") },
1129 {"ident", &flag_no_ident, 0,
1130 N_("Process #ident directives") },
1131 { "peephole2", &flag_peephole2, 1,
1132 N_("Enables an rtl peephole pass run before sched2") },
1133 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1134 N_("Enables guessing of branch probabilities") },
1135 {"math-errno", &flag_errno_math, 1,
1136 N_("Set errno after built-in math functions") },
1137 {"trapping-math", &flag_trapping_math, 1,
1138 N_("Floating-point operations can trap") },
1139 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1140 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1141 {"bounded-pointers", &flag_bounded_pointers, 1,
1142 N_("Compile pointers as triples: value, base & end") },
1143 {"bounds-check", &flag_bounds_check, 1,
1144 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1145 {"single-precision-constant", &flag_single_precision_constant, 1,
1146 N_("Convert floating point constant to single precision constant") },
1147 {"time-report", &time_report, 1,
1148 N_("Report time taken by each compiler pass at end of run") },
1149 {"mem-report", &mem_report, 1,
1150 N_("Report on permanent memory allocation at end of run") },
1151 { "trapv", &flag_trapv, 1,
1152 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1155 /* Table of language-specific options. */
1157 static const struct lang_opt
1159 const char *const option;
1160 const char *const description;
1162 documented_lang_options[] =
1164 /* In order not to overload the --help output, the convention
1165 used here is to only describe those options which are not
1166 enabled by default. */
1169 N_("Compile just for ISO C89") },
1171 N_("Determine language standard") },
1173 { "-fsigned-bitfields", "" },
1174 { "-funsigned-bitfields",
1175 N_("Make bit-fields by unsigned by default") },
1176 { "-fno-signed-bitfields", "" },
1177 { "-fno-unsigned-bitfields","" },
1179 N_("Make 'char' be signed by default") },
1180 { "-funsigned-char",
1181 N_("Make 'char' be unsigned by default") },
1182 { "-fno-signed-char", "" },
1183 { "-fno-unsigned-char", "" },
1187 N_("Do not recognize the 'asm' keyword") },
1188 { "-fbuiltin", "" },
1190 N_("Do not recognize any built in functions") },
1192 N_("Assume normal C execution environment") },
1193 { "-fno-hosted", "" },
1195 N_("Assume that standard libraries & main might not exist") },
1196 { "-fno-freestanding", "" },
1197 { "-fcond-mismatch",
1198 N_("Allow different types as args of ? operator") },
1199 { "-fno-cond-mismatch", "" },
1200 { "-fdollars-in-identifiers",
1201 N_("Allow the use of $ inside identifiers") },
1202 { "-fno-dollars-in-identifiers", "" },
1203 { "-fpreprocessed", "" },
1204 { "-fno-preprocessed", "" },
1206 N_("Use the same size for double as for float") },
1207 { "-fno-short-double", "" },
1209 N_("Use the smallest fitting integer to hold enums") },
1210 { "-fno-short-enums", "" },
1212 N_("Override the underlying type for wchar_t to `unsigned short'") },
1213 { "-fno-short-wchar", "" },
1216 N_("Enable most warning messages") },
1217 { "-Wbad-function-cast",
1218 N_("Warn about casting functions to incompatible types") },
1219 { "-Wno-bad-function-cast", "" },
1220 { "-Wmissing-format-attribute",
1221 N_("Warn about functions which might be candidates for format attributes") },
1222 { "-Wno-missing-format-attribute", "" },
1224 N_("Warn about casts which discard qualifiers") },
1225 { "-Wno-cast-qual", "" },
1226 { "-Wchar-subscripts",
1227 N_("Warn about subscripts whose type is 'char'") },
1228 { "-Wno-char-subscripts", "" },
1230 N_("Warn if nested comments are detected") },
1231 { "-Wno-comment", "" },
1233 N_("Warn if nested comments are detected") },
1234 { "-Wno-comments", "" },
1236 N_("Warn about possibly confusing type conversions") },
1237 { "-Wno-conversion", "" },
1238 { "-Wdiv-by-zero", "" },
1239 { "-Wno-div-by-zero",
1240 N_("Do not warn about compile-time integer division by zero") },
1242 N_("Warn about testing equality of floating point numbers") },
1243 { "-Wno-float-equal", "" },
1245 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1246 { "-Wno-format", "" },
1247 { "-Wformat-extra-args", "" },
1248 { "-Wno-format-extra-args",
1249 N_("Don't warn about too many arguments to format functions") },
1250 { "-Wformat-nonliteral",
1251 N_("Warn about non-string-literal format strings") },
1252 { "-Wno-format-nonliteral", "" },
1253 { "-Wformat-security",
1254 N_("Warn about possible security problems with format functions") },
1255 { "-Wno-format-security", "" },
1256 { "-Wformat-y2k", "" },
1257 { "-Wno-format-y2k",
1258 N_("Don't warn about strftime formats yielding 2 digit years") },
1259 { "-Wimplicit-function-declaration",
1260 N_("Warn about implicit function declarations") },
1261 { "-Wno-implicit-function-declaration", "" },
1262 { "-Werror-implicit-function-declaration", "" },
1264 N_("Warn when a declaration does not specify a type") },
1265 { "-Wno-implicit-int", "" },
1266 { "-Wimplicit", "" },
1267 { "-Wno-implicit", "" },
1269 N_("Warn about the use of the #import directive") },
1270 { "-Wno-import", "" },
1271 { "-Wlong-long","" },
1273 N_("Do not warn about using 'long long' when -pedantic") },
1275 N_("Warn about suspicious declarations of main") },
1276 { "-Wno-main", "" },
1277 { "-Wmissing-braces",
1278 N_("Warn about possibly missing braces around initializers") },
1279 { "-Wno-missing-braces", "" },
1280 { "-Wmissing-declarations",
1281 N_("Warn about global funcs without previous declarations") },
1282 { "-Wno-missing-declarations", "" },
1283 { "-Wmissing-prototypes",
1284 N_("Warn about global funcs without prototypes") },
1285 { "-Wno-missing-prototypes", "" },
1287 N_("Warn about use of multicharacter literals") },
1288 { "-Wno-multichar", "" },
1289 { "-Wnested-externs",
1290 N_("Warn about externs not at file scope level") },
1291 { "-Wno-nested-externs", "" },
1293 N_("Warn about possible missing parentheses") },
1294 { "-Wno-parentheses", "" },
1295 { "-Wpointer-arith",
1296 N_("Warn about function pointer arithmetic") },
1297 { "-Wno-pointer-arith", "" },
1298 { "-Wredundant-decls",
1299 N_("Warn about multiple declarations of the same object") },
1300 { "-Wno-redundant-decls", "" },
1302 N_("Warn whenever a function's return-type defaults to int") },
1303 { "-Wno-return-type", "" },
1304 { "-Wsequence-point",
1305 N_("Warn about possible violations of sequence point rules") },
1306 { "-Wno-sequence-point", "" },
1308 N_("Warn about signed/unsigned comparisons") },
1309 { "-Wno-sign-compare", "" },
1310 { "-Wstrict-prototypes",
1311 N_("Warn about non-prototyped function decls") },
1312 { "-Wno-strict-prototypes", "" },
1314 N_("Warn about constructs whose meanings change in ISO C") },
1315 { "-Wno-traditional", "" },
1317 N_("Warn when trigraphs are encountered") },
1318 { "-Wno-trigraphs", "" },
1320 { "-Wno-undef", "" },
1321 { "-Wunknown-pragmas",
1322 N_("Warn about unrecognized pragmas") },
1323 { "-Wno-unknown-pragmas", "" },
1324 { "-Wwrite-strings",
1325 N_("Mark strings as 'const char *'") },
1326 { "-Wno-write-strings", "" },
1328 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1330 #include "options.h"
1334 /* Here is a table, controlled by the tm.h file, listing each -m switch
1335 and which bits in `target_switches' it should set or clear.
1336 If VALUE is positive, it is bits to set.
1337 If VALUE is negative, -VALUE is bits to clear.
1338 (The sign bit is not used so there is no confusion.) */
1342 const char *const name;
1344 const char *const description;
1346 target_switches [] = TARGET_SWITCHES;
1348 /* This table is similar, but allows the switch to have a value. */
1350 #ifdef TARGET_OPTIONS
1353 const char *const prefix;
1354 const char **const variable;
1355 const char *const description;
1357 target_options [] = TARGET_OPTIONS;
1360 /* Options controlling warnings. */
1362 /* Don't print warning messages. -w. */
1364 int inhibit_warnings = 0;
1366 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1368 int warn_system_headers = 0;
1370 /* Print various extra warnings. -W. */
1372 int extra_warnings = 0;
1374 /* Treat warnings as errors. -Werror. */
1376 int warnings_are_errors = 0;
1378 /* Nonzero to warn about unused variables, functions et.al. */
1380 int warn_unused_function;
1381 int warn_unused_label;
1382 int warn_unused_parameter;
1383 int warn_unused_variable;
1384 int warn_unused_value;
1386 /* Nonzero to warn about code which is never reached. */
1388 int warn_notreached;
1390 /* Nonzero to warn about variables used before they are initialized. */
1392 int warn_uninitialized;
1394 /* Nonzero means warn about all declarations which shadow others. */
1398 /* Warn if a switch on an enum fails to have a case for every enum value. */
1402 /* Nonzero means warn about function definitions that default the return type
1403 or that use a null return and have a return-type other than void. */
1405 int warn_return_type;
1407 /* Nonzero means warn about pointer casts that increase the required
1408 alignment of the target type (and might therefore lead to a crash
1409 due to a misaligned access). */
1411 int warn_cast_align;
1413 /* Nonzero means warn about any objects definitions whose size is larger
1414 than N bytes. Also want about function definitions whose returned
1415 values are larger than N bytes. The value N is in `larger_than_size'. */
1417 int warn_larger_than;
1418 HOST_WIDE_INT larger_than_size;
1420 /* Nonzero means warn if inline function is too large. */
1424 /* Warn if a function returns an aggregate,
1425 since there are often incompatible calling conventions for doing this. */
1427 int warn_aggregate_return;
1429 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1433 /* Warn when gcc pads a structure to an alignment boundary. */
1437 /* Warn when an optimization pass is disabled. */
1439 int warn_disabled_optimization;
1441 /* Warn about functions which might be candidates for attribute noreturn. */
1443 int warn_missing_noreturn;
1445 /* Nonzero means warn about uses of __attribute__((deprecated))
1448 int warn_deprecated_decl = 1;
1450 /* Likewise for -W. */
1452 static const lang_independent_options W_options[] =
1454 {"unused-function", &warn_unused_function, 1,
1455 N_("Warn when a function is unused") },
1456 {"unused-label", &warn_unused_label, 1,
1457 N_("Warn when a label is unused") },
1458 {"unused-parameter", &warn_unused_parameter, 1,
1459 N_("Warn when a function parameter is unused") },
1460 {"unused-variable", &warn_unused_variable, 1,
1461 N_("Warn when a variable is unused") },
1462 {"unused-value", &warn_unused_value, 1,
1463 N_("Warn when an expression value is unused") },
1464 {"system-headers", &warn_system_headers, 1,
1465 N_("Do not suppress warnings from system headers") },
1466 {"error", &warnings_are_errors, 1,
1467 N_("Treat all warnings as errors") },
1468 {"shadow", &warn_shadow, 1,
1469 N_("Warn when one local variable shadows another") },
1470 {"switch", &warn_switch, 1,
1471 N_("Warn about enumerated switches missing a specific case") },
1472 {"aggregate-return", &warn_aggregate_return, 1,
1473 N_("Warn about returning structures, unions or arrays") },
1474 {"cast-align", &warn_cast_align, 1,
1475 N_("Warn about pointer casts which increase alignment") },
1476 {"unreachable-code", &warn_notreached, 1,
1477 N_("Warn about code that will never be executed") },
1478 {"uninitialized", &warn_uninitialized, 1,
1479 N_("Warn about uninitialized automatic variables") },
1480 {"inline", &warn_inline, 1,
1481 N_("Warn when an inlined function cannot be inlined") },
1482 {"packed", &warn_packed, 1,
1483 N_("Warn when the packed attribute has no effect on struct layout") },
1484 {"padded", &warn_padded, 1,
1485 N_("Warn when padding is required to align struct members") },
1486 {"disabled-optimization", &warn_disabled_optimization, 1,
1487 N_("Warn when an optimization pass is disabled") },
1488 {"deprecated-declarations", &warn_deprecated_decl, 1,
1489 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1490 {"missing-noreturn", &warn_missing_noreturn, 1,
1491 N_("Warn about functions which might be candidates for attribute noreturn") }
1495 set_Wunused (setting)
1498 warn_unused_function = setting;
1499 warn_unused_label = setting;
1500 /* Unused function parameter warnings are reported when either ``-W
1501 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1502 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1504 warn_unused_parameter = 0;
1505 else if (!warn_unused_parameter)
1506 warn_unused_parameter = -1;
1507 warn_unused_variable = setting;
1508 warn_unused_value = setting;
1511 /* The following routines are useful in setting all the flags that
1512 -ffast-math and -fno-fast-math imply. */
1515 set_fast_math_flags ()
1517 flag_trapping_math = 0;
1518 flag_unsafe_math_optimizations = 1;
1519 flag_errno_math = 0;
1523 set_no_fast_math_flags ()
1525 flag_trapping_math = 1;
1526 flag_unsafe_math_optimizations = 0;
1527 flag_errno_math = 1;
1531 /* Output files for assembler code (real compiler output)
1532 and debugging dumps. */
1535 FILE *aux_info_file;
1536 FILE *rtl_dump_file = NULL;
1538 /* Decode the string P as an integral parameter.
1539 If the string is indeed an integer return its numeric value else
1540 issue an Invalid Option error for the option PNAME and return DEFVAL.
1541 If PNAME is zero just return DEFVAL, do not call error. */
1544 read_integral_parameter (p, pname, defval)
1549 const char *endp = p;
1553 if (ISDIGIT (*endp))
1562 error ("invalid option `%s'", pname);
1569 /* This calls abort and is used to avoid problems when abort if a macro.
1570 It is used when we need to pass the address of abort. */
1578 /* When `malloc.c' is compiled with `rcheck' defined,
1579 it calls this function to report clobberage. */
1583 const char *s ATTRIBUTE_UNUSED;
1588 /* Return the logarithm of X, base 2, considering X unsigned,
1589 if X is a power of 2. Otherwise, returns -1.
1591 This should be used via the `exact_log2' macro. */
1595 unsigned HOST_WIDE_INT x;
1598 /* Test for 0 or a power of 2. */
1599 if (x == 0 || x != (x & -x))
1601 while ((x >>= 1) != 0)
1606 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1607 If X is 0, return -1.
1609 This should be used via the floor_log2 macro. */
1613 unsigned HOST_WIDE_INT x;
1622 static int float_handler_set;
1624 jmp_buf float_handler;
1626 /* Signals actually come here. */
1629 float_signal (signo)
1630 /* If this is missing, some compilers complain. */
1631 int signo ATTRIBUTE_UNUSED;
1633 if (float_handled == 0)
1634 crash_signal (signo);
1637 /* On System-V derived systems, we must reinstall the signal handler.
1638 This is harmless on BSD-derived systems. */
1639 signal (SIGFPE, float_signal);
1640 longjmp (float_handler, 1);
1643 /* Specify where to longjmp to when a floating arithmetic error happens.
1644 If HANDLER is 0, it means don't handle the errors any more. */
1647 set_float_handler (handler)
1650 float_handled = (handler != 0);
1652 memcpy (float_handler, handler, sizeof (float_handler));
1654 if (float_handled && ! float_handler_set)
1656 signal (SIGFPE, float_signal);
1657 float_handler_set = 1;
1661 /* This is a wrapper function for code which might elicit an
1662 arithmetic exception. That code should be passed in as a function
1663 pointer FN, and one argument DATA. DATA is usually a struct which
1664 contains the real input and output for function FN. This function
1665 returns 0 (failure) if longjmp was called (i.e. an exception
1666 occurred.) It returns 1 (success) otherwise. */
1669 do_float_handler (fn, data)
1670 void (*fn) PARAMS ((PTR));
1677 /* We got here via longjmp () caused by an exception in function
1679 set_float_handler (NULL);
1683 set_float_handler (buf);
1685 set_float_handler (NULL);
1689 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1690 into ICE messages, which is much more user friendly. */
1693 crash_signal (signo)
1696 internal_error ("internal error: %s", strsignal (signo));
1699 /* Strip off a legitimate source ending from the input string NAME of
1700 length LEN. Rather than having to know the names used by all of
1701 our front ends, we strip off an ending of a period followed by
1702 up to five characters. (Java uses ".class".) */
1705 strip_off_ending (name, len)
1710 for (i = 2; i < 6 && len > i; i++)
1712 if (name[len - i] == '.')
1714 name[len - i] = '\0';
1720 /* Output a quoted string. */
1723 output_quoted_string (asm_file, string)
1727 #ifdef OUTPUT_QUOTED_STRING
1728 OUTPUT_QUOTED_STRING (asm_file, string);
1732 putc ('\"', asm_file);
1733 while ((c = *string++) != 0)
1737 if (c == '\"' || c == '\\')
1738 putc ('\\', asm_file);
1742 fprintf (asm_file, "\\%03o", c);
1744 putc ('\"', asm_file);
1748 /* Output a file name in the form wanted by System V. */
1751 output_file_directive (asm_file, input_name)
1753 const char *input_name;
1755 int len = strlen (input_name);
1756 const char *na = input_name + len;
1758 /* NA gets INPUT_NAME sans directory names. */
1759 while (na > input_name)
1761 if (IS_DIR_SEPARATOR (na[-1]))
1766 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1767 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1769 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1770 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1772 fprintf (asm_file, "\t.file\t");
1773 output_quoted_string (asm_file, na);
1774 fputc ('\n', asm_file);
1779 /* Routine to open a dump file. Return true if the dump file is enabled. */
1782 open_dump_file (index, decl)
1783 enum dump_file_index index;
1787 const char *open_arg;
1790 if (! dump_file[index].enabled)
1793 timevar_push (TV_DUMP);
1794 if (rtl_dump_file != NULL)
1795 fclose (rtl_dump_file);
1797 sprintf (seq, DUMPFILE_FORMAT, index);
1799 if (! dump_file[index].initialized)
1801 /* If we've not initialized the files, do so now. */
1802 if (graph_dump_format != no_graph
1803 && dump_file[index].graph_dump_p)
1805 dump_name = concat (seq, dump_file[index].extension, NULL);
1806 clean_graph_dump_file (dump_base_name, dump_name);
1809 dump_file[index].initialized = 1;
1815 dump_name = concat (dump_base_name, seq,
1816 dump_file[index].extension, NULL);
1818 rtl_dump_file = fopen (dump_name, open_arg);
1819 if (rtl_dump_file == NULL)
1820 fatal_io_error ("can't open %s", dump_name);
1825 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1826 (*lang_hooks.decl_printable_name) (decl, 2));
1828 timevar_pop (TV_DUMP);
1832 /* Routine to close a dump file. */
1835 close_dump_file (index, func, insns)
1836 enum dump_file_index index;
1837 void (*func) PARAMS ((FILE *, rtx));
1840 if (! rtl_dump_file)
1843 timevar_push (TV_DUMP);
1845 && graph_dump_format != no_graph
1846 && dump_file[index].graph_dump_p)
1851 sprintf (seq, DUMPFILE_FORMAT, index);
1852 suffix = concat (seq, dump_file[index].extension, NULL);
1853 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1858 func (rtl_dump_file, insns);
1860 fflush (rtl_dump_file);
1861 fclose (rtl_dump_file);
1863 rtl_dump_file = NULL;
1864 timevar_pop (TV_DUMP);
1867 /* Do any final processing required for the declarations in VEC, of
1868 which there are LEN. We write out inline functions and variables
1869 that have been deferred until this point, but which are required.
1870 Returns non-zero if anything was put out. */
1873 wrapup_global_declarations (vec, len)
1880 int output_something = 0;
1882 for (i = 0; i < len; i++)
1886 /* We're not deferring this any longer. */
1887 DECL_DEFER_OUTPUT (decl) = 0;
1889 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1890 && incomplete_decl_finalize_hook != 0)
1891 (*incomplete_decl_finalize_hook) (decl);
1894 /* Now emit any global variables or functions that we have been
1895 putting off. We need to loop in case one of the things emitted
1896 here references another one which comes earlier in the list. */
1900 for (i = 0; i < len; i++)
1904 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1907 /* Don't write out static consts, unless we still need them.
1909 We also keep static consts if not optimizing (for debugging),
1910 unless the user specified -fno-keep-static-consts.
1911 ??? They might be better written into the debug information.
1912 This is possible when using DWARF.
1914 A language processor that wants static constants to be always
1915 written out (even if it is not used) is responsible for
1916 calling rest_of_decl_compilation itself. E.g. the C front-end
1917 calls rest_of_decl_compilation from finish_decl.
1918 One motivation for this is that is conventional in some
1919 environments to write things like:
1920 static const char rcsid[] = "... version string ...";
1921 intending to force the string to be in the executable.
1923 A language processor that would prefer to have unneeded
1924 static constants "optimized away" would just defer writing
1925 them out until here. E.g. C++ does this, because static
1926 constants are often defined in header files.
1928 ??? A tempting alternative (for both C and C++) would be
1929 to force a constant to be written if and only if it is
1930 defined in a main file, as opposed to an include file. */
1932 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1936 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1938 else if (DECL_COMDAT (decl))
1940 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1941 && (optimize || !flag_keep_static_consts
1942 || DECL_ARTIFICIAL (decl)))
1948 rest_of_decl_compilation (decl, NULL, 1, 1);
1952 if (TREE_CODE (decl) == FUNCTION_DECL
1953 && DECL_INITIAL (decl) != 0
1954 && DECL_SAVED_INSNS (decl) != 0
1955 && (flag_keep_inline_functions
1956 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1957 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1960 output_inline_function (decl);
1965 output_something = 1;
1969 return output_something;
1972 /* Issue appropriate warnings for the global declarations in VEC (of
1973 which there are LEN). Output debugging information for them. */
1976 check_global_declarations (vec, len)
1983 for (i = 0; i < len; i++)
1987 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1988 && ! TREE_ASM_WRITTEN (decl))
1989 /* Cancel the RTL for this decl so that, if debugging info
1990 output for global variables is still to come,
1991 this one will be omitted. */
1992 SET_DECL_RTL (decl, NULL_RTX);
1994 /* Warn about any function
1995 declared static but not defined.
1996 We don't warn about variables,
1997 because many programs have static variables
1998 that exist only to get some text into the object file. */
1999 if (TREE_CODE (decl) == FUNCTION_DECL
2000 && (warn_unused_function
2001 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2002 && DECL_INITIAL (decl) == 0
2003 && DECL_EXTERNAL (decl)
2004 && ! DECL_ARTIFICIAL (decl)
2005 && ! TREE_PUBLIC (decl))
2007 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2008 pedwarn_with_decl (decl,
2009 "`%s' used but never defined");
2011 warning_with_decl (decl,
2012 "`%s' declared `static' but never defined");
2013 /* This symbol is effectively an "extern" declaration now. */
2014 TREE_PUBLIC (decl) = 1;
2015 assemble_external (decl);
2018 /* Warn about static fns or vars defined but not used,
2019 but not about inline functions or static consts
2020 since defining those in header files is normal practice. */
2021 if (((warn_unused_function
2022 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2023 || (warn_unused_variable
2024 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2025 && ! DECL_IN_SYSTEM_HEADER (decl)
2026 && ! DECL_EXTERNAL (decl)
2027 && ! TREE_PUBLIC (decl)
2028 && ! TREE_USED (decl)
2029 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2030 /* The TREE_USED bit for file-scope decls
2031 is kept in the identifier, to handle multiple
2032 external decls in different scopes. */
2033 && ! TREE_USED (DECL_NAME (decl)))
2034 warning_with_decl (decl, "`%s' defined but not used");
2036 timevar_push (TV_SYMOUT);
2037 (*debug_hooks->global_decl) (decl);
2038 timevar_pop (TV_SYMOUT);
2042 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2043 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2044 INPUT_FILENAME and LINENO accordingly. */
2047 push_srcloc (file, line)
2051 struct file_stack *fs;
2053 if (input_file_stack)
2055 input_file_stack->name = input_filename;
2056 input_file_stack->line = lineno;
2059 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2060 fs->name = input_filename = file;
2061 fs->line = lineno = line;
2062 fs->indent_level = 0;
2063 fs->next = input_file_stack;
2064 input_file_stack = fs;
2065 input_file_stack_tick++;
2068 /* Pop the top entry off the stack of presently open source files.
2069 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2075 struct file_stack *fs;
2077 fs = input_file_stack;
2078 input_file_stack = fs->next;
2080 input_file_stack_tick++;
2081 /* The initial source file is never popped. */
2082 if (!input_file_stack)
2084 input_filename = input_file_stack->name;
2085 lineno = input_file_stack->line;
2088 /* Compile an entire translation unit. Write a file of assembly
2089 output and various debugging dumps. */
2096 /* Initialize yet another pass. */
2098 init_final (main_input_filename);
2099 init_branch_prob (dump_base_name);
2101 timevar_push (TV_PARSE);
2103 /* Call the parser, which parses the entire file (calling
2104 rest_of_compilation for each function). */
2105 (*lang_hooks.parse_file) ();
2107 /* In case there were missing block closers,
2108 get us back to the global binding level. */
2109 (*lang_hooks.clear_binding_stack) ();
2111 /* Compilation is now finished except for writing
2112 what's left of the symbol table output. */
2113 timevar_pop (TV_PARSE);
2115 if (flag_syntax_only)
2118 globals = (*lang_hooks.decls.getdecls) ();
2120 /* Really define vars that have had only a tentative definition.
2121 Really output inline functions that must actually be callable
2122 and have not been output so far. */
2125 int len = list_length (globals);
2126 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2130 /* Process the decls in reverse order--earliest first.
2131 Put them into VEC from back to front, then take out from front. */
2133 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2134 vec[len - i - 1] = decl;
2136 wrapup_global_declarations (vec, len);
2138 /* This must occur after the loop to output deferred functions. Else
2139 the profiler initializer would not be emitted if all the functions
2140 in this compilation unit were deferred.
2142 output_func_start_profiler can not cause any additional functions or
2143 data to need to be output, so it need not be in the deferred function
2145 output_func_start_profiler ();
2147 check_global_declarations (vec, len);
2153 /* Write out any pending weak symbol declarations. */
2157 /* Do dbx symbols. */
2158 timevar_push (TV_SYMOUT);
2160 #ifdef DWARF2_UNWIND_INFO
2161 if (dwarf2out_do_frame ())
2162 dwarf2out_frame_finish ();
2165 (*debug_hooks->finish) (main_input_filename);
2166 timevar_pop (TV_SYMOUT);
2168 /* Output some stuff at end of file if nec. */
2170 dw2_output_indirect_constants ();
2172 end_final (dump_base_name);
2174 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2176 timevar_push (TV_DUMP);
2177 open_dump_file (DFI_bp, NULL);
2181 close_dump_file (DFI_bp, NULL, NULL_RTX);
2182 timevar_pop (TV_DUMP);
2186 ASM_FILE_END (asm_out_file);
2189 /* Attach a special .ident directive to the end of the file to identify
2190 the version of GCC which compiled this code. The format of the .ident
2191 string is patterned after the ones produced by native SVR4 compilers. */
2194 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2195 IDENT_ASM_OP, version_string);
2198 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2200 timevar_push (TV_DUMP);
2201 dump_combine_total_stats (rtl_dump_file);
2202 close_dump_file (DFI_combine, NULL, NULL_RTX);
2203 timevar_pop (TV_DUMP);
2207 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2208 and TYPE_DECL nodes.
2210 This does nothing for local (non-static) variables, unless the
2211 variable is a register variable with an ASMSPEC. In that case, or
2212 if the variable is not an automatic, it sets up the RTL and
2213 outputs any assembler code (label definition, storage allocation
2214 and initialization).
2216 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2217 the assembler symbol name to be used. TOP_LEVEL is nonzero
2218 if this declaration is not within a function. */
2221 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2223 const char *asmspec;
2227 /* Declarations of variables, and of functions defined elsewhere. */
2229 /* The most obvious approach, to put an #ifndef around where
2230 this macro is used, doesn't work since it's inside a macro call. */
2231 #ifndef ASM_FINISH_DECLARE_OBJECT
2232 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2235 /* We deferred calling assemble_alias so that we could collect
2236 other attributes such as visibility. Emit the alias now. */
2239 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2242 alias = TREE_VALUE (TREE_VALUE (alias));
2243 alias = get_identifier (TREE_STRING_POINTER (alias));
2244 assemble_alias (decl, alias);
2248 /* Forward declarations for nested functions are not "external",
2249 but we need to treat them as if they were. */
2250 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2251 || TREE_CODE (decl) == FUNCTION_DECL)
2253 timevar_push (TV_VARCONST);
2256 make_decl_rtl (decl, asmspec);
2258 /* Don't output anything when a tentative file-scope definition
2259 is seen. But at end of compilation, do output code for them. */
2260 if (at_end || !DECL_DEFER_OUTPUT (decl))
2261 assemble_variable (decl, top_level, at_end, 0);
2262 if (decl == last_assemble_variable_decl)
2264 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2268 timevar_pop (TV_VARCONST);
2270 else if (DECL_REGISTER (decl) && asmspec != 0)
2272 if (decode_reg_name (asmspec) >= 0)
2274 SET_DECL_RTL (decl, NULL_RTX);
2275 make_decl_rtl (decl, asmspec);
2279 error ("invalid register name `%s' for register variable", asmspec);
2280 DECL_REGISTER (decl) = 0;
2285 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2286 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2287 && TREE_CODE (decl) == TYPE_DECL)
2289 timevar_push (TV_SYMOUT);
2290 dbxout_symbol (decl, 0);
2291 timevar_pop (TV_SYMOUT);
2294 #ifdef SDB_DEBUGGING_INFO
2295 else if (write_symbols == SDB_DEBUG && top_level
2296 && TREE_CODE (decl) == TYPE_DECL)
2298 timevar_push (TV_SYMOUT);
2299 sdbout_symbol (decl, 0);
2300 timevar_pop (TV_SYMOUT);
2305 /* Called after finishing a record, union or enumeral type. */
2308 rest_of_type_compilation (type, toplev)
2309 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2313 tree type ATTRIBUTE_UNUSED;
2314 int toplev ATTRIBUTE_UNUSED;
2317 timevar_push (TV_SYMOUT);
2318 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2319 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2320 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2322 #ifdef SDB_DEBUGGING_INFO
2323 if (write_symbols == SDB_DEBUG)
2324 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2326 #ifdef DWARF2_DEBUGGING_INFO
2327 if ((write_symbols == DWARF2_DEBUG
2328 || write_symbols == VMS_AND_DWARF2_DEBUG)
2330 dwarf2out_decl (TYPE_STUB_DECL (type));
2332 timevar_pop (TV_SYMOUT);
2335 /* This is called from finish_function (within langhooks.parse_file)
2336 after each top-level definition is parsed.
2337 It is supposed to compile that function or variable
2338 and output the assembler code for it.
2339 After we return, the tree storage is freed. */
2342 rest_of_compilation (decl)
2348 int rebuild_label_notes_after_reload;
2349 int register_life_up_to_date;
2351 timevar_push (TV_REST_OF_COMPILATION);
2353 /* Now that we're out of the frontend, we shouldn't have any more
2354 CONCATs anywhere. */
2355 generating_concat_p = 0;
2357 /* When processing delayed functions, prepare_function_start() won't
2358 have been run to re-initialize it. */
2359 cse_not_expected = ! optimize;
2361 /* First, make sure that NOTE_BLOCK is set correctly for each
2362 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2363 if (!cfun->x_whole_function_mode_p)
2366 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2367 tree in sensible shape. So, we just recalculate it here. */
2368 if (cfun->x_whole_function_mode_p)
2373 /* If we are reconsidering an inline function
2374 at the end of compilation, skip the stuff for making it inline. */
2376 if (DECL_SAVED_INSNS (decl) == 0)
2382 /* If this is nested inside an inlined external function, pretend
2383 it was only declared. Since we cannot inline such functions,
2384 generating code for this one is not only not necessary but will
2385 confuse some debugging output writers. */
2386 for (parent = DECL_CONTEXT (current_function_decl);
2387 parent != NULL_TREE;
2388 parent = get_containing_scope (parent))
2389 if (TREE_CODE (parent) == FUNCTION_DECL
2390 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2392 DECL_INITIAL (decl) = 0;
2393 goto exit_rest_of_compilation;
2396 /* If requested, consider whether to make this function inline. */
2397 if ((DECL_INLINE (decl) && !flag_no_inline)
2398 || flag_inline_functions)
2400 timevar_push (TV_INTEGRATION);
2401 lose = function_cannot_inline_p (decl);
2402 timevar_pop (TV_INTEGRATION);
2403 if (lose || ! optimize)
2405 if (warn_inline && DECL_INLINE (decl))
2406 warning_with_decl (decl, lose);
2407 DECL_ABSTRACT_ORIGIN (decl) = 0;
2408 /* Don't really compile an extern inline function.
2409 If we can't make it inline, pretend
2410 it was only declared. */
2411 if (DECL_EXTERNAL (decl))
2413 DECL_INITIAL (decl) = 0;
2414 goto exit_rest_of_compilation;
2418 /* ??? Note that this has the effect of making it look
2419 like "inline" was specified for a function if we choose
2420 to inline it. This isn't quite right, but it's
2421 probably not worth the trouble to fix. */
2422 inlinable = DECL_INLINE (decl) = 1;
2425 insns = get_insns ();
2427 /* Dump the rtl code if we are dumping rtl. */
2429 if (open_dump_file (DFI_rtl, decl))
2431 if (DECL_SAVED_INSNS (decl))
2432 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2433 close_dump_file (DFI_rtl, print_rtl, insns);
2436 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2437 sorts of eh initialization. Delay this until after the
2438 initial rtl dump so that we can see the original nesting. */
2439 convert_from_eh_region_ranges ();
2441 /* If function is inline, and we don't yet know whether to
2442 compile it by itself, defer decision till end of compilation.
2443 finish_compilation will call rest_of_compilation again
2444 for those functions that need to be output. Also defer those
2445 functions that we are supposed to defer. */
2448 || (DECL_INLINE (decl)
2449 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2450 && ! flag_keep_inline_functions)
2451 || DECL_EXTERNAL (decl))))
2452 DECL_DEFER_OUTPUT (decl) = 1;
2454 if (DECL_INLINE (decl))
2455 /* DWARF wants separate debugging info for abstract and
2456 concrete instances of all inline functions, including those
2457 declared inline but not inlined, and those inlined even
2458 though they weren't declared inline. Conveniently, that's
2459 what DECL_INLINE means at this point. */
2460 (*debug_hooks->deferred_inline_function) (decl);
2462 if (DECL_DEFER_OUTPUT (decl))
2464 /* If -Wreturn-type, we have to do a bit of compilation. We just
2465 want to call cleanup the cfg to figure out whether or not we can
2466 fall off the end of the function; we do the minimum amount of
2467 work necessary to make that safe. */
2468 if (warn_return_type)
2470 int saved_optimize = optimize;
2473 rebuild_jump_labels (insns);
2474 find_exception_handler_labels ();
2475 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2476 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2477 optimize = saved_optimize;
2479 /* CFG is no longer maintained up-to-date. */
2480 free_bb_for_insn ();
2483 current_function_nothrow = nothrow_function_p ();
2484 if (current_function_nothrow)
2485 /* Now we know that this can't throw; set the flag for the benefit
2486 of other functions later in this translation unit. */
2487 TREE_NOTHROW (current_function_decl) = 1;
2489 timevar_push (TV_INTEGRATION);
2490 save_for_inline (decl);
2491 timevar_pop (TV_INTEGRATION);
2492 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2493 goto exit_rest_of_compilation;
2496 /* If specified extern inline but we aren't inlining it, we are
2497 done. This goes for anything that gets here with DECL_EXTERNAL
2498 set, not just things with DECL_INLINE. */
2499 if (DECL_EXTERNAL (decl))
2500 goto exit_rest_of_compilation;
2503 /* If we're emitting a nested function, make sure its parent gets
2504 emitted as well. Doing otherwise confuses debug info. */
2507 for (parent = DECL_CONTEXT (current_function_decl);
2508 parent != NULL_TREE;
2509 parent = get_containing_scope (parent))
2510 if (TREE_CODE (parent) == FUNCTION_DECL)
2511 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2514 /* We are now committed to emitting code for this function. Do any
2515 preparation, such as emitting abstract debug info for the inline
2516 before it gets mangled by optimization. */
2517 if (DECL_INLINE (decl))
2518 (*debug_hooks->outlining_inline_function) (decl);
2520 /* Remove any notes we don't need. That will make iterating
2521 over the instruction sequence faster, and allow the garbage
2522 collector to reclaim the memory used by the notes. */
2523 remove_unnecessary_notes ();
2528 /* Initialize some variables used by the optimizers. */
2529 init_function_for_compilation ();
2531 if (! DECL_DEFER_OUTPUT (decl))
2532 TREE_ASM_WRITTEN (decl) = 1;
2534 /* Now that integrate will no longer see our rtl, we need not
2535 distinguish between the return value of this function and the
2536 return value of called functions. Also, we can remove all SETs
2537 of subregs of hard registers; they are only here because of
2538 integrate. Also, we can now initialize pseudos intended to
2539 carry magic hard reg data throughout the function. */
2540 rtx_equal_function_value_matters = 0;
2541 purge_hard_subreg_sets (get_insns ());
2542 emit_initial_value_sets ();
2544 /* Early return if there were errors. We can run afoul of our
2545 consistency checks, and there's not really much point in fixing them.
2546 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2547 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2548 || errorcount || sorrycount)
2549 goto exit_rest_of_compilation;
2551 /* We may have potential sibling or tail recursion sites. Select one
2552 (of possibly multiple) methods of performing the call. */
2553 if (flag_optimize_sibling_calls)
2555 timevar_push (TV_JUMP);
2556 open_dump_file (DFI_sibling, decl);
2558 optimize_sibling_and_tail_recursive_calls ();
2560 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2561 timevar_pop (TV_JUMP);
2564 /* Complete generation of exception handling code. */
2565 find_exception_handler_labels ();
2568 timevar_push (TV_JUMP);
2569 open_dump_file (DFI_eh, decl);
2571 finish_eh_generation ();
2573 close_dump_file (DFI_eh, print_rtl, get_insns ());
2574 timevar_pop (TV_JUMP);
2578 /* If we are doing position-independent code generation, now
2579 is the time to output special prologues and epilogues.
2580 We do not want to do this earlier, because it just clutters
2581 up inline functions with meaningless insns. */
2586 insns = get_insns ();
2588 /* Copy any shared structure that should not be shared. */
2589 unshare_all_rtl (current_function_decl, insns);
2591 #ifdef SETJMP_VIA_SAVE_AREA
2592 /* This must be performed before virtual register instantiation. */
2593 if (current_function_calls_alloca)
2594 optimize_save_area_alloca (insns);
2597 /* Instantiate all virtual registers. */
2598 instantiate_virtual_regs (current_function_decl, insns);
2600 open_dump_file (DFI_jump, decl);
2602 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2603 are initialized and to compute whether control can drop off the end
2606 timevar_push (TV_JUMP);
2607 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2608 before jump optimization switches branch directions. */
2609 expected_value_to_br_prob ();
2611 reg_scan (insns, max_reg_num (), 0);
2612 rebuild_jump_labels (insns);
2613 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2615 dump_flow_info (rtl_dump_file);
2616 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2617 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2619 /* CFG is no longer maintained up-to-date. */
2620 free_bb_for_insn ();
2621 copy_loop_headers (insns);
2622 purge_line_number_notes (insns);
2624 timevar_pop (TV_JUMP);
2625 close_dump_file (DFI_jump, print_rtl, insns);
2627 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2628 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2630 goto exit_rest_of_compilation;
2633 /* Long term, this should probably move before the jump optimizer too,
2634 but I didn't want to disturb the rtl_dump_and_exit and related
2635 stuff at this time. */
2636 if (optimize > 0 && flag_ssa)
2638 /* Convert to SSA form. */
2640 timevar_push (TV_TO_SSA);
2641 open_dump_file (DFI_ssa, decl);
2643 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2644 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2647 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2648 timevar_pop (TV_TO_SSA);
2650 /* Perform sparse conditional constant propagation, if requested. */
2653 timevar_push (TV_SSA_CCP);
2654 open_dump_file (DFI_ssa_ccp, decl);
2658 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2659 timevar_pop (TV_SSA_CCP);
2662 /* It would be useful to cleanup the CFG at this point, but block
2663 merging and possibly other transformations might leave a PHI
2664 node in the middle of a basic block, which is a strict no-no. */
2666 /* The SSA implementation uses basic block numbers in its phi
2667 nodes. Thus, changing the control-flow graph or the basic
2668 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2669 may cause problems. */
2673 /* Remove dead code. */
2675 timevar_push (TV_SSA_DCE);
2676 open_dump_file (DFI_ssa_dce, decl);
2678 insns = get_insns ();
2679 ssa_eliminate_dead_code();
2681 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2682 timevar_pop (TV_SSA_DCE);
2685 /* Convert from SSA form. */
2687 timevar_push (TV_FROM_SSA);
2688 open_dump_file (DFI_ussa, decl);
2690 convert_from_ssa ();
2691 /* New registers have been created. Rescan their usage. */
2692 reg_scan (insns, max_reg_num (), 1);
2694 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2695 timevar_pop (TV_FROM_SSA);
2698 /* CFG is no longer maintained up-to-date. */
2699 free_bb_for_insn ();
2702 timevar_push (TV_JUMP);
2706 open_dump_file (DFI_null, decl);
2707 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2709 dump_flow_info (rtl_dump_file);
2710 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2712 /* Try to identify useless null pointer tests and delete them. */
2713 if (flag_delete_null_pointer_checks)
2714 delete_null_pointer_checks (insns);
2716 timevar_push (TV_IFCVT);
2718 timevar_pop (TV_IFCVT);
2719 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2720 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2723 /* Jump optimization, and the removal of NULL pointer checks, may
2724 have reduced the number of instructions substantially. CSE, and
2725 future passes, allocate arrays whose dimensions involve the
2726 maximum instruction UID, so if we can reduce the maximum UID
2727 we'll save big on memory. */
2728 renumber_insns (rtl_dump_file);
2730 compute_bb_for_insn (get_max_uid ());
2731 timevar_pop (TV_JUMP);
2733 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2737 /* Perform common subexpression elimination.
2738 Nonzero value from `cse_main' means that jumps were simplified
2739 and some code may now be unreachable, so do
2740 jump optimization again. */
2744 open_dump_file (DFI_cse, decl);
2746 dump_flow_info (rtl_dump_file);
2747 timevar_push (TV_CSE);
2749 reg_scan (insns, max_reg_num (), 1);
2751 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2753 rebuild_jump_labels (insns);
2754 purge_all_dead_edges (0);
2756 delete_trivially_dead_insns (insns, max_reg_num ());
2758 /* If we are not running more CSE passes, then we are no longer
2759 expecting CSE to be run. But always rerun it in a cheap mode. */
2760 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2762 if (tem || optimize > 1)
2763 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2764 /* Try to identify useless null pointer tests and delete them. */
2765 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2767 timevar_push (TV_JUMP);
2769 if (flag_delete_null_pointer_checks)
2770 delete_null_pointer_checks (insns);
2771 /* CFG is no longer maintained up-to-date. */
2772 timevar_pop (TV_JUMP);
2775 /* The second pass of jump optimization is likely to have
2776 removed a bunch more instructions. */
2777 renumber_insns (rtl_dump_file);
2778 compute_bb_for_insn (get_max_uid ());
2780 timevar_pop (TV_CSE);
2781 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2784 open_dump_file (DFI_addressof, decl);
2786 purge_addressof (insns);
2788 purge_all_dead_edges (0);
2789 reg_scan (insns, max_reg_num (), 1);
2791 close_dump_file (DFI_addressof, print_rtl, insns);
2795 /* Perform global cse. */
2797 if (optimize > 0 && flag_gcse)
2799 int save_csb, save_cfj;
2802 timevar_push (TV_GCSE);
2803 open_dump_file (DFI_gcse, decl);
2805 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2806 tem = gcse_main (insns, rtl_dump_file);
2807 rebuild_jump_labels (insns);
2808 delete_trivially_dead_insns (insns, max_reg_num ());
2810 save_csb = flag_cse_skip_blocks;
2811 save_cfj = flag_cse_follow_jumps;
2812 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2814 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2816 if (flag_expensive_optimizations)
2818 timevar_push (TV_CSE);
2819 reg_scan (insns, max_reg_num (), 1);
2820 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2821 purge_all_dead_edges (0);
2822 delete_trivially_dead_insns (insns, max_reg_num ());
2823 timevar_pop (TV_CSE);
2824 cse_not_expected = !flag_rerun_cse_after_loop;
2827 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2828 things up. Then possibly re-run CSE again. */
2832 timevar_push (TV_JUMP);
2833 rebuild_jump_labels (insns);
2834 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2835 timevar_pop (TV_JUMP);
2837 if (flag_expensive_optimizations)
2839 timevar_push (TV_CSE);
2840 reg_scan (insns, max_reg_num (), 1);
2841 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2842 purge_all_dead_edges (0);
2843 delete_trivially_dead_insns (insns, max_reg_num ());
2844 timevar_pop (TV_CSE);
2848 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2849 timevar_pop (TV_GCSE);
2852 flag_cse_skip_blocks = save_csb;
2853 flag_cse_follow_jumps = save_cfj;
2854 #ifdef ENABLE_CHECKING
2855 verify_flow_info ();
2859 /* Move constant computations out of loops. */
2861 if (optimize > 0 && flag_loop_optimize)
2863 timevar_push (TV_LOOP);
2864 delete_dead_jumptables ();
2865 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2866 open_dump_file (DFI_loop, decl);
2867 /* CFG is no longer maintained up-to-date. */
2868 free_bb_for_insn ();
2870 if (flag_rerun_loop_opt)
2872 cleanup_barriers ();
2874 /* We only want to perform unrolling once. */
2876 loop_optimize (insns, rtl_dump_file, 0);
2878 /* The first call to loop_optimize makes some instructions
2879 trivially dead. We delete those instructions now in the
2880 hope that doing so will make the heuristics in loop work
2881 better and possibly speed up compilation. */
2882 delete_trivially_dead_insns (insns, max_reg_num ());
2884 /* The regscan pass is currently necessary as the alias
2885 analysis code depends on this information. */
2886 reg_scan (insns, max_reg_num (), 1);
2888 cleanup_barriers ();
2889 loop_optimize (insns, rtl_dump_file,
2890 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2891 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2893 /* Loop can create trivially dead instructions. */
2894 delete_trivially_dead_insns (insns, max_reg_num ());
2895 close_dump_file (DFI_loop, print_rtl, insns);
2896 timevar_pop (TV_LOOP);
2901 /* Do control and data flow analysis; wrote some of the results to
2904 timevar_push (TV_FLOW);
2905 open_dump_file (DFI_cfg, decl);
2907 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2909 dump_flow_info (rtl_dump_file);
2910 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2911 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2913 /* It may make more sense to mark constant functions after dead code is
2914 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2915 may insert code making function non-constant, but we still must consider
2916 it as constant, otherwise -fbranch-probabilities will not read data back.
2918 life_analyzis rarely eliminates modification of external memory.
2920 mark_constant_function ();
2922 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2924 /* Do branch profiling and static profile estimation passes. */
2925 if (optimize > 0 || profile_arc_flag || flag_test_coverage
2926 || flag_branch_probabilities)
2930 timevar_push (TV_BRANCH_PROB);
2931 open_dump_file (DFI_bp, decl);
2932 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2935 /* Discover and record the loop depth at the head of each basic
2936 block. The loop infrastructure does the real job for us. */
2937 flow_loops_find (&loops, LOOP_TREE);
2939 /* Estimate using heuristics if no profiling info is available. */
2940 if (flag_guess_branch_prob)
2941 estimate_probability (&loops);
2944 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
2946 flow_loops_free (&loops);
2947 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2948 timevar_pop (TV_BRANCH_PROB);
2953 timevar_push (TV_CSE2);
2954 open_dump_file (DFI_cse2, decl);
2956 dump_flow_info (rtl_dump_file);
2958 if (flag_rerun_cse_after_loop)
2960 timevar_push (TV_JUMP);
2962 reg_scan (insns, max_reg_num (), 0);
2964 timevar_push (TV_IFCVT);
2965 cleanup_cfg (CLEANUP_EXPENSIVE);
2967 timevar_pop(TV_IFCVT);
2969 timevar_pop (TV_JUMP);
2970 /* CFG is no longer maintained up-to-date. */
2971 reg_scan (insns, max_reg_num (), 0);
2972 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2973 purge_all_dead_edges (0);
2974 delete_trivially_dead_insns (insns, max_reg_num ());
2978 timevar_push (TV_JUMP);
2979 rebuild_jump_labels (insns);
2980 cleanup_cfg (CLEANUP_EXPENSIVE);
2981 timevar_pop (TV_JUMP);
2985 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
2986 timevar_pop (TV_CSE2);
2991 cse_not_expected = 1;
2993 open_dump_file (DFI_life, decl);
2996 check_function_return_warnings ();
2998 #ifdef ENABLE_CHECKING
2999 verify_flow_info ();
3001 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3003 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3004 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3005 timevar_pop (TV_FLOW);
3009 if (warn_uninitialized || extra_warnings)
3011 uninitialized_vars_warning (DECL_INITIAL (decl));
3013 setjmp_args_warning ();
3019 if (initialize_uninitialized_subregs ())
3021 /* Insns were inserted, so things might look a bit different. */
3022 insns = get_insns ();
3023 update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
3024 PROP_LOG_LINKS | PROP_REG_INFO
3025 | PROP_DEATH_NOTES);
3029 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3033 /* If -opt, try combining insns through substitution. */
3037 int rebuild_jump_labels_after_combine = 0;
3039 timevar_push (TV_COMBINE);
3040 open_dump_file (DFI_combine, decl);
3042 rebuild_jump_labels_after_combine
3043 = combine_instructions (insns, max_reg_num ());
3045 /* Combining insns may have turned an indirect jump into a
3046 direct jump. Rebuid the JUMP_LABEL fields of jumping
3048 if (rebuild_jump_labels_after_combine)
3050 timevar_push (TV_JUMP);
3051 rebuild_jump_labels (insns);
3052 timevar_pop (TV_JUMP);
3054 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3057 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3058 timevar_pop (TV_COMBINE);
3063 /* Rerun if-conversion, as combine may have simplified things enough to
3064 now meet sequence length restrictions. */
3067 timevar_push (TV_IFCVT);
3068 open_dump_file (DFI_ce, decl);
3074 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3075 timevar_pop (TV_IFCVT);
3078 /* Register allocation pre-pass, to reduce number of moves
3079 necessary for two-address machines. */
3080 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3082 timevar_push (TV_REGMOVE);
3083 open_dump_file (DFI_regmove, decl);
3085 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3087 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3088 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3089 timevar_pop (TV_REGMOVE);
3094 /* Do unconditional splitting before register allocation to allow machine
3095 description to add extra information not needed previously. */
3096 split_all_insns (1);
3098 /* Any of the several passes since flow1 will have munged register
3099 lifetime data a bit. */
3100 register_life_up_to_date = 0;
3102 #ifdef OPTIMIZE_MODE_SWITCHING
3103 timevar_push (TV_MODE_SWITCH);
3106 optimize_mode_switching (NULL);
3109 timevar_pop (TV_MODE_SWITCH);
3112 timevar_push (TV_SCHED);
3114 #ifdef INSN_SCHEDULING
3116 /* Print function header into sched dump now
3117 because doing the sched analysis makes some of the dump. */
3118 if (optimize > 0 && flag_schedule_insns)
3120 open_dump_file (DFI_sched, decl);
3122 /* Do control and data sched analysis,
3123 and write some of the results to dump file. */
3125 schedule_insns (rtl_dump_file);
3127 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3129 /* Register lifetime information was updated as part of verifying
3131 register_life_up_to_date = 1;
3134 timevar_pop (TV_SCHED);
3138 /* Determine if the current function is a leaf before running reload
3139 since this can impact optimizations done by the prologue and
3140 epilogue thus changing register elimination offsets. */
3141 current_function_is_leaf = leaf_function_p ();
3143 timevar_push (TV_LOCAL_ALLOC);
3144 open_dump_file (DFI_lreg, decl);
3146 /* Allocate pseudo-regs that are used only within 1 basic block.
3148 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3149 jump optimizer after register allocation and reloading are finished. */
3151 if (! register_life_up_to_date)
3152 recompute_reg_usage (insns, ! optimize_size);
3154 /* Allocate the reg_renumber array. */
3155 allocate_reg_info (max_regno, FALSE, TRUE);
3157 /* And the reg_equiv_memory_loc array. */
3158 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3160 allocate_initial_values (reg_equiv_memory_loc);
3162 regclass (insns, max_reg_num (), rtl_dump_file);
3163 rebuild_label_notes_after_reload = local_alloc ();
3165 timevar_pop (TV_LOCAL_ALLOC);
3167 if (dump_file[DFI_lreg].enabled)
3169 timevar_push (TV_DUMP);
3171 dump_flow_info (rtl_dump_file);
3172 dump_local_alloc (rtl_dump_file);
3174 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3175 timevar_pop (TV_DUMP);
3180 timevar_push (TV_GLOBAL_ALLOC);
3181 open_dump_file (DFI_greg, decl);
3183 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3184 pass fixing up any insns that are invalid. */
3187 failure = global_alloc (rtl_dump_file);
3190 build_insn_chain (insns);
3191 failure = reload (insns, 0);
3194 timevar_pop (TV_GLOBAL_ALLOC);
3196 if (dump_file[DFI_greg].enabled)
3198 timevar_push (TV_DUMP);
3200 dump_global_regs (rtl_dump_file);
3202 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3203 timevar_pop (TV_DUMP);
3207 goto exit_rest_of_compilation;
3211 open_dump_file (DFI_postreload, decl);
3213 /* Do a very simple CSE pass over just the hard registers. */
3216 timevar_push (TV_RELOAD_CSE_REGS);
3217 reload_cse_regs (insns);
3218 timevar_pop (TV_RELOAD_CSE_REGS);
3221 /* Register allocation and reloading may have turned an indirect jump into
3222 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3223 jumping instructions. */
3224 if (rebuild_label_notes_after_reload)
3226 timevar_push (TV_JUMP);
3228 rebuild_jump_labels (insns);
3229 purge_all_dead_edges (0);
3231 timevar_pop (TV_JUMP);
3234 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3236 /* Re-create the death notes which were deleted during reload. */
3237 timevar_push (TV_FLOW2);
3238 open_dump_file (DFI_flow2, decl);
3240 #ifdef ENABLE_CHECKING
3241 verify_flow_info ();
3244 /* If optimizing, then go ahead and split insns now. */
3246 split_all_insns (0);
3248 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3250 /* On some machines, the prologue and epilogue code, or parts thereof,
3251 can be represented as RTL. Doing so lets us schedule insns between
3252 it and the rest of the code and also allows delayed branch
3253 scheduling to operate in the epilogue. */
3254 thread_prologue_and_epilogue_insns (insns);
3258 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3259 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3260 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3262 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3263 even for machines with possibly nonzero RETURN_POPS_ARGS
3264 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3265 push instructions will have popping returns. */
3266 #ifndef PUSH_ROUNDING
3267 if (!ACCUMULATE_OUTGOING_ARGS)
3269 combine_stack_adjustments ();
3274 flow2_completed = 1;
3276 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3277 timevar_pop (TV_FLOW2);
3279 #ifdef HAVE_peephole2
3280 if (optimize > 0 && flag_peephole2)
3282 timevar_push (TV_PEEPHOLE2);
3283 open_dump_file (DFI_peephole2, decl);
3285 peephole2_optimize (rtl_dump_file);
3287 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3288 timevar_pop (TV_PEEPHOLE2);
3292 if (flag_rename_registers || flag_cprop_registers)
3294 timevar_push (TV_RENAME_REGISTERS);
3295 open_dump_file (DFI_rnreg, decl);
3297 if (flag_rename_registers)
3298 regrename_optimize ();
3299 if (flag_cprop_registers)
3300 copyprop_hardreg_forward ();
3302 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3303 timevar_pop (TV_RENAME_REGISTERS);
3308 timevar_push (TV_IFCVT2);
3309 open_dump_file (DFI_ce2, decl);
3313 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3314 timevar_pop (TV_IFCVT2);
3318 split_all_insns (1);
3321 #ifdef INSN_SCHEDULING
3322 if (optimize > 0 && flag_schedule_insns_after_reload)
3324 timevar_push (TV_SCHED2);
3325 open_dump_file (DFI_sched2, decl);
3327 /* Do control and data sched analysis again,
3328 and write some more of the results to dump file. */
3330 split_all_insns (1);
3332 schedule_insns (rtl_dump_file);
3334 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3335 timevar_pop (TV_SCHED2);
3341 #ifdef LEAF_REGISTERS
3342 current_function_uses_only_leaf_regs
3343 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3347 timevar_push (TV_REG_STACK);
3348 open_dump_file (DFI_stack, decl);
3350 reg_to_stack (insns, rtl_dump_file);
3352 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3353 timevar_pop (TV_REG_STACK);
3359 timevar_push (TV_REORDER_BLOCKS);
3360 open_dump_file (DFI_bbro, decl);
3362 /* Last attempt to optimize CFG, as scheduling, peepholing
3363 and insn splitting possibly introduced more crossjumping
3365 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3366 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3367 if (flag_reorder_blocks)
3369 reorder_basic_blocks ();
3370 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3373 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3374 timevar_pop (TV_REORDER_BLOCKS);
3376 compute_alignments ();
3378 /* CFG is no longer maintained up-to-date. */
3379 free_bb_for_insn ();
3381 /* If a machine dependent reorganization is needed, call it. */
3382 #ifdef MACHINE_DEPENDENT_REORG
3383 timevar_push (TV_MACH_DEP);
3384 open_dump_file (DFI_mach, decl);
3386 MACHINE_DEPENDENT_REORG (insns);
3388 close_dump_file (DFI_mach, print_rtl, insns);
3389 timevar_pop (TV_MACH_DEP);
3394 purge_line_number_notes (insns);
3395 cleanup_barriers ();
3397 /* If a scheduling pass for delayed branches is to be done,
3398 call the scheduling code. */
3401 if (optimize > 0 && flag_delayed_branch)
3403 timevar_push (TV_DBR_SCHED);
3404 open_dump_file (DFI_dbr, decl);
3406 dbr_schedule (insns, rtl_dump_file);
3408 close_dump_file (DFI_dbr, print_rtl, insns);
3409 timevar_pop (TV_DBR_SCHED);
3415 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3416 timevar_push (TV_SHORTEN_BRANCH);
3417 split_all_insns_noflow ();
3418 timevar_pop (TV_SHORTEN_BRANCH);
3421 convert_to_eh_region_ranges ();
3423 /* Shorten branches. */
3424 timevar_push (TV_SHORTEN_BRANCH);
3425 shorten_branches (get_insns ());
3426 timevar_pop (TV_SHORTEN_BRANCH);
3428 current_function_nothrow = nothrow_function_p ();
3429 if (current_function_nothrow)
3430 /* Now we know that this can't throw; set the flag for the benefit
3431 of other functions later in this translation unit. */
3432 TREE_NOTHROW (current_function_decl) = 1;
3434 /* Now turn the rtl into assembler code. */
3436 timevar_push (TV_FINAL);
3441 /* Get the function's name, as described by its RTL. This may be
3442 different from the DECL_NAME name used in the source file. */
3444 x = DECL_RTL (decl);
3445 if (GET_CODE (x) != MEM)
3448 if (GET_CODE (x) != SYMBOL_REF)
3450 fnname = XSTR (x, 0);
3452 assemble_start_function (decl, fnname);
3453 final_start_function (insns, asm_out_file, optimize);
3454 final (insns, asm_out_file, optimize, 0);
3455 final_end_function ();
3457 #ifdef IA64_UNWIND_INFO
3458 /* ??? The IA-64 ".handlerdata" directive must be issued before
3459 the ".endp" directive that closes the procedure descriptor. */
3460 output_function_exception_table ();
3463 assemble_end_function (decl, fnname);
3465 #ifndef IA64_UNWIND_INFO
3466 /* Otherwise, it feels unclean to switch sections in the middle. */
3467 output_function_exception_table ();
3471 fflush (asm_out_file);
3473 /* Release all memory allocated by flow. */
3474 free_basic_block_vars (0);
3476 /* Release all memory held by regsets now. */
3477 regset_release_memory ();
3479 timevar_pop (TV_FINAL);
3483 /* Write DBX symbols if requested. */
3485 /* Note that for those inline functions where we don't initially
3486 know for certain that we will be generating an out-of-line copy,
3487 the first invocation of this routine (rest_of_compilation) will
3488 skip over this code by doing a `goto exit_rest_of_compilation;'.
3489 Later on, finish_compilation will call rest_of_compilation again
3490 for those inline functions that need to have out-of-line copies
3491 generated. During that call, we *will* be routed past here. */
3493 timevar_push (TV_SYMOUT);
3494 (*debug_hooks->function_decl) (decl);
3495 timevar_pop (TV_SYMOUT);
3497 exit_rest_of_compilation:
3499 /* In case the function was not output,
3500 don't leave any temporary anonymous types
3501 queued up for sdb output. */
3502 #ifdef SDB_DEBUGGING_INFO
3503 if (write_symbols == SDB_DEBUG)
3504 sdbout_types (NULL_TREE);
3507 reload_completed = 0;
3508 flow2_completed = 0;
3511 timevar_push (TV_FINAL);
3513 /* Clear out the insn_length contents now that they are no
3515 init_insn_lengths ();
3517 /* Clear out the real_constant_chain before some of the rtx's
3518 it runs through become garbage. */
3519 clear_const_double_mem ();
3521 /* Show no temporary slots allocated. */
3524 free_basic_block_vars (0);
3525 free_bb_for_insn ();
3527 timevar_pop (TV_FINAL);
3529 /* Make sure volatile mem refs aren't considered valid operands for
3530 arithmetic insns. We must call this here if this is a nested inline
3531 function, since the above code leaves us in the init_recog state
3532 (from final.c), and the function context push/pop code does not
3533 save/restore volatile_ok.
3535 ??? Maybe it isn't necessary for expand_start_function to call this
3536 anymore if we do it here? */
3538 init_recog_no_volatile ();
3540 /* We're done with this function. Free up memory if we can. */
3541 free_after_parsing (cfun);
3542 if (! DECL_DEFER_OUTPUT (decl))
3544 free_after_compilation (cfun);
3546 /* Clear integrate.c's pointer to the cfun structure we just
3548 DECL_SAVED_INSNS (decl) = 0;
3554 timevar_pop (TV_REST_OF_COMPILATION);
3564 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3565 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3566 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3567 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3568 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3569 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"));
3571 for (i = ARRAY_SIZE (f_options); i--;)
3573 const char *description = f_options[i].description;
3575 if (description != NULL && * description != 0)
3576 printf (" -f%-21s %s\n",
3577 f_options[i].string, _(description));
3580 printf (_(" -O[number] Set optimization level to [number]\n"));
3581 printf (_(" -Os Optimize for space rather than speed\n"));
3582 for (i = LAST_PARAM; i--;)
3584 const char *description = compiler_params[i].help;
3585 const int length = 21-strlen(compiler_params[i].option);
3587 if (description != NULL && * description != 0)
3588 printf (" --param %s=<value>%.*s%s\n",
3589 compiler_params[i].option,
3590 length > 0 ? length : 1, " ",
3593 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3594 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3595 printf (_(" -w Suppress warnings\n"));
3596 printf (_(" -W Enable extra warnings\n"));
3598 for (i = ARRAY_SIZE (W_options); i--;)
3600 const char *description = W_options[i].description;
3602 if (description != NULL && * description != 0)
3603 printf (" -W%-21s %s\n",
3604 W_options[i].string, _(description));
3607 printf (_(" -Wunused Enable unused warnings\n"));
3608 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3609 printf (_(" -p Enable function profiling\n"));
3610 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3611 printf (_(" -a Enable block profiling \n"));
3613 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3614 printf (_(" -ax Enable jump profiling \n"));
3616 printf (_(" -o <file> Place output into <file> \n"));
3618 -G <number> Put global and static data smaller than <number>\n\
3619 bytes into a special section (on some targets)\n"));
3621 for (i = ARRAY_SIZE (debug_args); i--;)
3623 if (debug_args[i].description != NULL)
3624 printf (" -g%-21s %s\n",
3625 debug_args[i].arg, _(debug_args[i].description));
3628 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3629 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3630 printf (_(" -version Display the compiler's version\n"));
3631 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3632 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3633 #if defined INSN_SCHEDULING
3634 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3636 printf (_(" --help Display this information\n"));
3641 /* Display descriptions of language specific options.
3642 If there is no description, note that there is an undocumented option.
3643 If the description is empty, do not display anything. (This allows
3644 options to be deliberately undocumented, for whatever reason).
3645 If the option string is missing, then this is a marker, indicating
3646 that the description string is in fact the name of a language, whose
3647 language specific options are to follow. */
3649 if (ARRAY_SIZE (documented_lang_options) > 1)
3651 printf (_("\nLanguage specific options:\n"));
3653 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3655 const char *description = documented_lang_options[i].description;
3656 const char *option = documented_lang_options[i].option;
3658 if (description == NULL)
3663 printf (_(" %-23.23s [undocumented]\n"), option);
3665 else if (*description == 0)
3667 else if (option == NULL)
3671 (_("\nThere are undocumented %s specific options as well.\n"),
3675 printf (_("\n Options for %s:\n"), description);
3680 printf (" %-23.23s %s\n", option, _(description));
3685 printf (_("\nThere are undocumented %s specific options as well.\n"),
3688 display_target_options ();
3692 display_target_options ()
3695 static bool displayed = false;
3697 /* Avoid double printing for --help --target-help. */
3702 if (ARRAY_SIZE (target_switches) > 1
3703 #ifdef TARGET_OPTIONS
3704 || ARRAY_SIZE (target_options) > 1
3712 printf (_("\nTarget specific options:\n"));
3714 for (i = ARRAY_SIZE (target_switches); i--;)
3716 const char *option = target_switches[i].name;
3717 const char *description = target_switches[i].description;
3719 if (option == NULL || *option == 0)
3721 else if (description == NULL)
3726 printf (_(" -m%-23.23s [undocumented]\n"), option);
3728 else if (* description != 0)
3729 doc += printf (" -m%-23.23s %s\n", option, _(description));
3732 #ifdef TARGET_OPTIONS
3733 for (i = ARRAY_SIZE (target_options); i--;)
3735 const char *option = target_options[i].prefix;
3736 const char *description = target_options[i].description;
3738 if (option == NULL || *option == 0)
3740 else if (description == NULL)
3745 printf (_(" -m%-23.23s [undocumented]\n"), option);
3747 else if (* description != 0)
3748 doc += printf (" -m%-23.23s %s\n", option, _(description));
3754 printf (_("\nThere are undocumented target specific options as well.\n"));
3756 printf (_(" They exist, but they are not documented.\n"));
3761 /* Parse a -d... command line switch. */
3764 decode_d_option (arg)
3773 for (i = 0; i < (int) DFI_MAX; ++i)
3774 dump_file[i].enabled = 1;
3780 flag_print_asm_name = 1;
3783 flag_dump_rtl_in_asm = 1;
3784 flag_print_asm_name = 1;
3787 graph_dump_format = vcg;
3790 rtl_dump_and_exit = 1;
3793 (*lang_hooks.set_yydebug) (1);
3795 case 'D': /* These are handled by the preprocessor. */
3801 for (i = 0; i < (int) DFI_MAX; ++i)
3802 if (c == dump_file[i].debug_switch)
3804 dump_file[i].enabled = 1;
3809 warning ("unrecognized gcc debugging option: %c", c);
3814 /* Parse a -f... command line switch. ARG is the value after the -f.
3815 It is safe to access 'ARG - 2' to generate the full switch name.
3816 Return the number of strings consumed. */
3819 decode_f_option (arg)
3823 const char *option_value = NULL;
3825 /* Search for the option in the table of binary f options. */
3826 for (j = ARRAY_SIZE (f_options); j--;)
3828 if (!strcmp (arg, f_options[j].string))
3830 *f_options[j].variable = f_options[j].on_value;
3834 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3835 && ! strcmp (arg + 3, f_options[j].string))
3837 *f_options[j].variable = ! f_options[j].on_value;
3842 if (!strcmp (arg, "fast-math"))
3843 set_fast_math_flags ();
3844 else if (!strcmp (arg, "no-fast-math"))
3845 set_no_fast_math_flags ();
3846 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3847 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3850 read_integral_parameter (option_value, arg - 2,
3852 set_param_value ("max-inline-insns", val);
3854 #ifdef INSN_SCHEDULING
3855 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3856 fix_sched_param ("verbose", option_value);
3858 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3859 fix_register (option_value, 1, 1);
3860 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3861 fix_register (option_value, 0, 1);
3862 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3863 fix_register (option_value, 0, 0);
3864 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3865 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3866 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3868 = read_integral_parameter (option_value, arg - 2, align_functions);
3869 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3870 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3871 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3873 = read_integral_parameter (option_value, arg - 2, align_labels);
3874 else if ((option_value
3875 = skip_leading_substring (arg, "stack-limit-register=")))
3877 int reg = decode_reg_name (option_value);
3879 error ("unrecognized register name `%s'", option_value);
3881 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3883 else if ((option_value
3884 = skip_leading_substring (arg, "stack-limit-symbol=")))
3887 nm = ggc_strdup (option_value);
3888 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3890 else if ((option_value
3891 = skip_leading_substring (arg, "message-length=")))
3892 output_set_maximum_length
3893 (&global_dc->buffer, read_integral_parameter
3894 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3895 else if ((option_value
3896 = skip_leading_substring (arg, "diagnostics-show-location=")))
3898 if (!strcmp (option_value, "once"))
3899 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3900 else if (!strcmp (option_value, "every-line"))
3901 diagnostic_prefixing_rule (global_dc)
3902 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3904 error ("unrecognized option `%s'", arg - 2);
3906 else if (!strcmp (arg, "no-stack-limit"))
3907 stack_limit_rtx = NULL_RTX;
3908 else if (!strcmp (arg, "preprocessed"))
3909 /* Recognise this switch but do nothing. This prevents warnings
3910 about an unrecognized switch if cpplib has not been linked in. */
3918 /* Parse a -W... command line switch. ARG is the value after the -W.
3919 It is safe to access 'ARG - 2' to generate the full switch name.
3920 Return the number of strings consumed. */
3923 decode_W_option (arg)
3926 const char *option_value = NULL;
3929 /* Search for the option in the table of binary W options. */
3931 for (j = ARRAY_SIZE (W_options); j--;)
3933 if (!strcmp (arg, W_options[j].string))
3935 *W_options[j].variable = W_options[j].on_value;
3939 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3940 && ! strcmp (arg + 3, W_options[j].string))
3942 *W_options[j].variable = ! W_options[j].on_value;
3947 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3948 warning ("-Wid-clash-LEN is no longer supported");
3949 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3951 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3953 warn_larger_than = larger_than_size != -1;
3955 else if (!strcmp (arg, "unused"))
3959 else if (!strcmp (arg, "no-unused"))
3969 /* Parse a -g... command line switch. ARG is the value after the -g.
3970 It is safe to access 'ARG - 2' to generate the full switch name.
3971 Return the number of strings consumed. */
3974 decode_g_option (arg)
3977 static unsigned level=0;
3978 /* A lot of code assumes write_symbols == NO_DEBUG if the
3979 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3980 of what debugging type has been selected). This records the
3981 selected type. It is an error to specify more than one
3983 static enum debug_info_type selected_debug_type = NO_DEBUG;
3984 /* Non-zero if debugging format has been explicitly set.
3985 -g and -ggdb don't explicitly set the debugging format so
3986 -gdwarf -g3 is equivalent to -gdwarf3. */
3987 static int type_explicitly_set_p = 0;
3988 /* Indexed by enum debug_info_type. */
3989 static const char *const debug_type_names[] =
3991 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
3994 /* The maximum admissible debug level value. */
3995 static const unsigned max_debug_level = 3;
3997 /* Look up ARG in the table. */
3998 for (da = debug_args; da->arg; da++)
4000 const int da_len = strlen (da->arg);
4002 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4004 enum debug_info_type type = da->debug_type;
4005 const char *p = arg + da_len;
4007 if (*p && ! ISDIGIT (*p))
4010 /* A debug flag without a level defaults to level 2.
4011 Note we do not want to call read_integral_parameter
4012 for that case since it will call atoi which
4015 ??? We may want to generalize the interface to
4016 read_integral_parameter to better handle this case
4017 if this case shows up often. */
4019 level = read_integral_parameter (p, 0, max_debug_level + 1);
4021 level = (level == 0) ? 2 : level;
4023 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4025 error ("use -gdwarf -g%d for DWARF v1, level %d",
4028 error ("use -gdwarf-2 for DWARF v2");
4031 if (level > max_debug_level)
4034 ignoring option `%s' due to invalid debug level specification",
4036 level = debug_info_level;
4039 if (type == NO_DEBUG)
4041 type = PREFERRED_DEBUGGING_TYPE;
4043 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4045 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4046 type = DWARF2_DEBUG;
4048 #ifdef DBX_DEBUGGING_INFO
4055 if (type == NO_DEBUG)
4056 warning ("`%s': unknown or unsupported -g option", arg - 2);
4058 /* Does it conflict with an already selected type? */
4059 if (type_explicitly_set_p
4060 /* -g/-ggdb don't conflict with anything. */
4061 && da->debug_type != NO_DEBUG
4062 && type != selected_debug_type)
4063 warning ("`%s' ignored, conflicts with `-g%s'",
4064 arg - 2, debug_type_names[(int) selected_debug_type]);
4067 /* If the format has already been set, -g/-ggdb
4068 only change the debug level. */
4069 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4070 /* Don't change debugging type. */
4074 selected_debug_type = type;
4075 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4078 write_symbols = (level == 0
4080 : selected_debug_type);
4081 use_gnu_debug_info_extensions = da->use_extensions_p;
4082 debug_info_level = (enum debug_info_level) level;
4095 /* Decode the first argument in the argv as a language-independent option.
4096 Return the number of strings consumed. */
4099 independent_decode_option (argc, argv)
4103 char *arg = argv[0];
4105 if (arg[0] != '-' || arg[1] == 0)
4117 if (!strcmp (arg, "-help"))
4120 exit_after_options = 1;
4123 if (!strcmp (arg, "-target-help"))
4125 display_target_options ();
4126 exit_after_options = 1;
4129 if (!strcmp (arg, "-version"))
4131 print_version (stderr, "");
4132 exit_after_options = 1;
4135 /* Handle '--param <name>=<value>'. */
4136 if (strcmp (arg, "-param") == 0)
4142 error ("-param option missing argument");
4146 /* Get the '<name>=<value>' parameter. */
4148 /* Look for the `='. */
4149 equal = strchr (arg, '=');
4151 error ("invalid --param option: %s", arg);
4156 /* Zero out the `=' sign so that we get two separate strings. */
4158 /* Figure out what value is specified. */
4159 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4160 if (val != INVALID_PARAM_VAL)
4161 set_param_value (arg, val);
4163 error ("invalid parameter value `%s'", equal + 1);
4178 /* Already been treated in main (). Do nothing. */
4182 set_target_switch (arg + 1);
4186 return decode_f_option (arg + 1);
4189 return decode_g_option (arg + 1);
4192 if (!strcmp (arg, "dumpbase"))
4197 dump_base_name = argv[1];
4201 decode_d_option (arg + 1);
4205 if (!strcmp (arg, "pedantic"))
4207 else if (!strcmp (arg, "pedantic-errors"))
4208 flag_pedantic_errors = pedantic = 1;
4209 else if (arg[1] == 0)
4216 if (!strcmp (arg, "quiet"))
4223 if (!strcmp (arg, "version"))
4231 inhibit_warnings = 1;
4240 /* We save the value of warn_uninitialized, since if they put
4241 -Wuninitialized on the command line, we need to generate a
4242 warning about not using it without also specifying -O. */
4243 if (warn_uninitialized != 1)
4244 warn_uninitialized = 2;
4247 return decode_W_option (arg + 1);
4251 if (!strncmp (arg, "aux-info", 8))
4258 aux_info_file_name = argv[1];
4259 flag_gen_aux_info = 1;
4262 else if (arg[8] == '=')
4264 aux_info_file_name = arg + 9;
4265 flag_gen_aux_info = 1;
4280 asm_file_name = argv[1];
4295 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4300 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4304 if (g_switch_val == -1)
4308 g_switch_set = TRUE;
4309 g_switch_value = g_switch_val;
4319 /* Decode -m switches. */
4320 /* Decode the switch -mNAME. */
4323 set_target_switch (name)
4327 int valid_target_option = 0;
4329 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4330 if (!strcmp (target_switches[j].name, name))
4332 if (target_switches[j].value < 0)
4333 target_flags &= ~-target_switches[j].value;
4335 target_flags |= target_switches[j].value;
4336 valid_target_option = 1;
4339 #ifdef TARGET_OPTIONS
4340 if (!valid_target_option)
4341 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4343 int len = strlen (target_options[j].prefix);
4344 if (!strncmp (target_options[j].prefix, name, len))
4346 *target_options[j].variable = name + len;
4347 valid_target_option = 1;
4352 if (!valid_target_option)
4353 error ("invalid option `%s'", name);
4356 /* Print version information to FILE.
4357 Each line begins with INDENT (for the case where FILE is the
4358 assembler output file). */
4361 print_version (file, indent)
4366 #define __VERSION__ "[?]"
4370 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4372 "%s%s%s version %s (%s) compiled by CC.\n"
4374 , indent, *indent != 0 ? " " : "",
4375 lang_hooks.name, version_string, TARGET_NAME,
4376 indent, __VERSION__);
4379 /* Print an option value and return the adjusted position in the line.
4380 ??? We don't handle error returns from fprintf (disk full); presumably
4381 other code will catch a disk full though. */
4384 print_single_switch (file, pos, max, indent, sep, term, type, name)
4387 const char *indent, *sep, *term, *type, *name;
4389 /* The ultrix fprintf returns 0 on success, so compute the result we want
4390 here since we need it for the following test. */
4391 int len = strlen (sep) + strlen (type) + strlen (name);
4396 fprintf (file, "%s", term);
4401 fprintf (file, "%s", indent);
4402 pos = strlen (indent);
4404 fprintf (file, "%s%s%s", sep, type, name);
4409 /* Print active target switches to FILE.
4410 POS is the current cursor position and MAX is the size of a "line".
4411 Each line begins with INDENT and ends with TERM.
4412 Each switch is separated from the next by SEP. */
4415 print_switch_values (file, pos, max, indent, sep, term)
4418 const char *indent, *sep, *term;
4423 /* Print the options as passed. */
4425 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4426 _("options passed: "), "");
4428 for (p = &save_argv[1]; *p != NULL; p++)
4432 if (strcmp (*p, "-o") == 0)
4438 if (strcmp (*p, "-quiet") == 0)
4440 if (strcmp (*p, "-version") == 0)
4445 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4448 fprintf (file, "%s", term);
4450 /* Print the -f and -m options that have been enabled.
4451 We don't handle language specific options but printing argv
4454 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4455 _("options enabled: "), "");
4457 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4458 if (*f_options[j].variable == f_options[j].on_value)
4459 pos = print_single_switch (file, pos, max, indent, sep, term,
4460 "-f", f_options[j].string);
4462 /* Print target specific options. */
4464 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4465 if (target_switches[j].name[0] != '\0'
4466 && target_switches[j].value > 0
4467 && ((target_switches[j].value & target_flags)
4468 == target_switches[j].value))
4470 pos = print_single_switch (file, pos, max, indent, sep, term,
4471 "-m", target_switches[j].name);
4474 #ifdef TARGET_OPTIONS
4475 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4476 if (*target_options[j].variable != NULL)
4479 sprintf (prefix, "-m%s", target_options[j].prefix);
4480 pos = print_single_switch (file, pos, max, indent, sep, term,
4481 prefix, *target_options[j].variable);
4485 fprintf (file, "%s", term);
4488 /* Open assembly code output file. Do this even if -fsyntax-only is
4489 on, because then the driver will have provided the name of a
4490 temporary file or bit bucket for us. NAME is the file specified on
4491 the command line, possibly NULL. */
4493 init_asm_output (name)
4496 if (name == NULL && asm_file_name == 0)
4497 asm_out_file = stdout;
4500 if (asm_file_name == 0)
4502 int len = strlen (dump_base_name);
4503 char *dumpname = (char *) xmalloc (len + 6);
4504 memcpy (dumpname, dump_base_name, len + 1);
4505 strip_off_ending (dumpname, len);
4506 strcat (dumpname, ".s");
4507 asm_file_name = dumpname;
4509 if (!strcmp (asm_file_name, "-"))
4510 asm_out_file = stdout;
4512 asm_out_file = fopen (asm_file_name, "w");
4513 if (asm_out_file == 0)
4514 fatal_io_error ("can't open %s for writing", asm_file_name);
4517 #ifdef IO_BUFFER_SIZE
4518 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4519 _IOFBF, IO_BUFFER_SIZE);
4522 if (!flag_syntax_only)
4524 #ifdef ASM_FILE_START
4525 ASM_FILE_START (asm_out_file);
4528 #ifdef ASM_COMMENT_START
4529 if (flag_verbose_asm)
4531 /* Print the list of options in effect. */
4532 print_version (asm_out_file, ASM_COMMENT_START);
4533 print_switch_values (asm_out_file, 0, MAX_LINE,
4534 ASM_COMMENT_START, " ", "\n");
4535 /* Add a blank line here so it appears in assembler output but not
4537 fprintf (asm_out_file, "\n");
4543 /* Initialization of the front end environment, before command line
4544 options are parsed. Signal handlers, internationalization etc.
4545 ARGV0 is main's argv[0]. */
4547 general_init (argv0)
4552 p = argv0 + strlen (argv0);
4553 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4557 xmalloc_set_program_name (progname);
4559 gcc_init_libintl ();
4561 /* Install handler for SIGFPE, which may be received while we do
4562 compile-time floating point arithmetic. */
4563 signal (SIGFPE, float_signal);
4565 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4567 signal (SIGSEGV, crash_signal);
4570 signal (SIGILL, crash_signal);
4573 signal (SIGBUS, crash_signal);
4576 signal (SIGABRT, crash_signal);
4578 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4579 signal (SIGIOT, crash_signal);
4582 /* Initialize the diagnostics reporting machinery, so option parsing
4583 can give warnings and errors. */
4584 diagnostic_initialize (global_dc);
4587 /* Parse command line options and set default flag values, called
4588 after language-independent option-independent initialization. Do
4589 minimal options processing. Outputting diagnostics is OK, but GC
4590 and identifier hashtables etc. are not initialized yet. */
4592 parse_options_and_default_flags (argc, argv)
4598 /* Save in case md file wants to emit args as a comment. */
4602 /* Initialize register usage now so switches may override. */
4605 /* Register the language-independent parameters. */
4606 add_params (lang_independent_params, LAST_PARAM);
4608 /* Perform language-specific options initialization. */
4609 (*lang_hooks.init_options) ();
4611 /* Scan to see what optimization level has been specified. That will
4612 determine the default value of many flags. */
4613 for (i = 1; i < argc; i++)
4615 if (!strcmp (argv[i], "-O"))
4620 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4622 /* Handle -Os, -O2, -O3, -O69, ... */
4623 char *p = &argv[i][2];
4625 if ((p[0] == 's') && (p[1] == 0))
4629 /* Optimizing for size forces optimize to be 2. */
4634 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4635 if (optimize_val != -1)
4637 optimize = optimize_val;
4646 flag_merge_constants = 0;
4652 flag_thread_jumps = 1;
4654 flag_delayed_branch = 1;
4656 #ifdef CAN_DEBUG_WITHOUT_FP
4657 flag_omit_frame_pointer = 1;
4659 flag_guess_branch_prob = 1;
4660 flag_cprop_registers = 1;
4661 flag_loop_optimize = 1;
4662 flag_crossjumping = 1;
4667 flag_optimize_sibling_calls = 1;
4668 flag_cse_follow_jumps = 1;
4669 flag_cse_skip_blocks = 1;
4671 flag_expensive_optimizations = 1;
4672 flag_strength_reduce = 1;
4673 flag_rerun_cse_after_loop = 1;
4674 flag_rerun_loop_opt = 1;
4675 flag_caller_saves = 1;
4678 #ifdef INSN_SCHEDULING
4679 flag_schedule_insns = 1;
4680 flag_schedule_insns_after_reload = 1;
4683 flag_strict_aliasing = 1;
4684 flag_delete_null_pointer_checks = 1;
4685 flag_reorder_blocks = 1;
4690 flag_inline_functions = 1;
4691 flag_rename_registers = 1;
4694 if (optimize < 2 || optimize_size)
4699 align_functions = 1;
4702 /* Initialize whether `char' is signed. */
4703 flag_signed_char = DEFAULT_SIGNED_CHAR;
4704 #ifdef DEFAULT_SHORT_ENUMS
4705 /* Initialize how much space enums occupy, by default. */
4706 flag_short_enums = DEFAULT_SHORT_ENUMS;
4709 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4712 set_target_switch ("");
4714 /* Unwind tables are always present in an ABI-conformant IA-64
4715 object file, so the default should be ON. */
4716 #ifdef IA64_UNWIND_INFO
4717 flag_unwind_tables = IA64_UNWIND_INFO;
4720 #ifdef OPTIMIZATION_OPTIONS
4721 /* Allow default optimizations to be specified on a per-machine basis. */
4722 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4725 /* Perform normal command line switch decoding. */
4726 for (i = 1; i < argc;)
4729 int indep_processed;
4731 /* Give the language a chance to decode the option for itself. */
4732 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4734 if (lang_processed >= 0)
4735 /* Now see if the option also has a language independent meaning.
4736 Some options are both language specific and language independent,
4738 indep_processed = independent_decode_option (argc - i, argv + i);
4741 lang_processed = -lang_processed;
4742 indep_processed = 0;
4745 if (lang_processed || indep_processed)
4746 i += MAX (lang_processed, indep_processed);
4749 const char *option = NULL;
4750 const char *lang = NULL;
4753 /* It is possible that the command line switch is not valid for the
4754 current language, but it is valid for another language. In order
4755 to be compatible with previous versions of the compiler (which
4756 did not issue an error message in this case) we check for this
4757 possibility here. If we do find a match, then if extra_warnings
4758 is set we generate a warning message, otherwise we will just
4759 ignore the option. */
4760 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4762 option = documented_lang_options[j].option;
4765 lang = documented_lang_options[j].description;
4766 else if (! strncmp (argv[i], option, strlen (option)))
4770 if (j != ARRAY_SIZE (documented_lang_options))
4774 warning ("ignoring command line option '%s'", argv[i]);
4777 ("(it is valid for %s but not the selected language)",
4781 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4782 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4784 error ("unrecognized option `%s'", argv[i]);
4790 /* Set flag_no_inline before the post_options () hook. The C front
4791 ends use it to determine tree inlining defaults. FIXME: such
4792 code should be lang-independent when all front ends use tree
4793 inlining, in which case it, and this condition, should be moved
4794 to the top of process_options() instead. */
4797 /* Inlining does not work if not optimizing,
4798 so force it not to be done. */
4802 /* The c_decode_option function and decode_option hook set
4803 this to `2' if -Wall is used, so we can avoid giving out
4804 lots of errors for people who don't realize what -Wall does. */
4805 if (warn_uninitialized == 1)
4806 warning ("-Wuninitialized is not supported without -O");
4809 /* All command line options have been parsed; allow the front end to
4810 perform consistency checks, etc. */
4811 (*lang_hooks.post_options) ();
4814 /* Process the options that have been parsed. */
4818 #ifdef OVERRIDE_OPTIONS
4819 /* Some machines may reject certain combinations of options. */
4823 /* Set up the align_*_log variables, defaulting them to 1 if they
4824 were still unset. */
4825 if (align_loops <= 0) align_loops = 1;
4826 if (align_loops_max_skip > align_loops || !align_loops)
4827 align_loops_max_skip = align_loops - 1;
4828 align_loops_log = floor_log2 (align_loops * 2 - 1);
4829 if (align_jumps <= 0) align_jumps = 1;
4830 if (align_jumps_max_skip > align_jumps || !align_jumps)
4831 align_jumps_max_skip = align_jumps - 1;
4832 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4833 if (align_labels <= 0) align_labels = 1;
4834 align_labels_log = floor_log2 (align_labels * 2 - 1);
4835 if (align_labels_max_skip > align_labels || !align_labels)
4836 align_labels_max_skip = align_labels - 1;
4837 if (align_functions <= 0) align_functions = 1;
4838 align_functions_log = floor_log2 (align_functions * 2 - 1);
4840 /* Unrolling all loops implies that standard loop unrolling must also
4842 if (flag_unroll_all_loops)
4843 flag_unroll_loops = 1;
4844 /* Loop unrolling requires that strength_reduction be on also. Silently
4845 turn on strength reduction here if it isn't already on. Also, the loop
4846 unrolling code assumes that cse will be run after loop, so that must
4847 be turned on also. */
4848 if (flag_unroll_loops)
4850 flag_strength_reduce = 1;
4851 flag_rerun_cse_after_loop = 1;
4854 if (flag_non_call_exceptions)
4855 flag_asynchronous_unwind_tables = 1;
4856 if (flag_asynchronous_unwind_tables)
4857 flag_unwind_tables = 1;
4859 /* Warn about options that are not supported on this machine. */
4860 #ifndef INSN_SCHEDULING
4861 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4862 warning ("instruction scheduling not supported on this target machine");
4865 if (flag_delayed_branch)
4866 warning ("this target machine does not have delayed branches");
4869 /* Some operating systems do not allow profiling without a frame
4871 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4873 && flag_omit_frame_pointer)
4875 error ("profiling does not work without a frame pointer");
4876 flag_omit_frame_pointer = 0;
4879 user_label_prefix = USER_LABEL_PREFIX;
4880 if (flag_leading_underscore != -1)
4882 /* If the default prefix is more complicated than "" or "_",
4883 issue a warning and ignore this option. */
4884 if (user_label_prefix[0] == 0 ||
4885 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4887 user_label_prefix = flag_leading_underscore ? "_" : "";
4890 warning ("-f%sleading-underscore not supported on this target machine",
4891 flag_leading_underscore ? "" : "no-");
4894 /* If we are in verbose mode, write out the version and maybe all the
4895 option flags in use. */
4898 print_version (stderr, "");
4900 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4906 if (flag_syntax_only)
4908 write_symbols = NO_DEBUG;
4912 /* Now we know write_symbols, set up the debug hooks based on it.
4913 By default we do nothing for debug output. */
4914 #if defined(DBX_DEBUGGING_INFO)
4915 if (write_symbols == DBX_DEBUG)
4916 debug_hooks = &dbx_debug_hooks;
4918 #if defined(XCOFF_DEBUGGING_INFO)
4919 if (write_symbols == XCOFF_DEBUG)
4920 debug_hooks = &xcoff_debug_hooks;
4922 #ifdef SDB_DEBUGGING_INFO
4923 if (write_symbols == SDB_DEBUG)
4924 debug_hooks = &sdb_debug_hooks;
4926 #ifdef DWARF_DEBUGGING_INFO
4927 if (write_symbols == DWARF_DEBUG)
4928 debug_hooks = &dwarf_debug_hooks;
4930 #ifdef DWARF2_DEBUGGING_INFO
4931 if (write_symbols == DWARF2_DEBUG)
4932 debug_hooks = &dwarf2_debug_hooks;
4934 #ifdef VMS_DEBUGGING_INFO
4935 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4936 debug_hooks = &vmsdbg_debug_hooks;
4939 /* If auxiliary info generation is desired, open the output file.
4940 This goes in the same directory as the source file--unlike
4941 all the other output files. */
4942 if (flag_gen_aux_info)
4944 aux_info_file = fopen (aux_info_file_name, "w");
4945 if (aux_info_file == 0)
4946 fatal_io_error ("can't open %s", aux_info_file_name);
4949 if (! targetm.have_named_sections)
4951 if (flag_function_sections)
4953 warning ("-ffunction-sections not supported for this target");
4954 flag_function_sections = 0;
4956 if (flag_data_sections)
4958 warning ("-fdata-sections not supported for this target");
4959 flag_data_sections = 0;
4963 if (flag_function_sections && profile_flag)
4965 warning ("-ffunction-sections disabled; it makes profiling impossible");
4966 flag_function_sections = 0;
4969 #ifndef HAVE_prefetch
4970 if (flag_prefetch_loop_arrays)
4972 warning ("-fprefetch-loop-arrays not supported for this target");
4973 flag_prefetch_loop_arrays = 0;
4976 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
4978 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
4979 flag_prefetch_loop_arrays = 0;
4983 /* This combination of options isn't handled for i386 targets and doesn't
4984 make much sense anyway, so don't allow it. */
4985 if (flag_prefetch_loop_arrays && optimize_size)
4987 warning ("-fprefetch-loop-arrays is not supported with -Os");
4988 flag_prefetch_loop_arrays = 0;
4991 #ifndef OBJECT_FORMAT_ELF
4992 if (flag_function_sections && write_symbols != NO_DEBUG)
4993 warning ("-ffunction-sections may affect debugging on some targets");
4997 /* Language-independent initialization, before language-dependent
5000 lang_independent_init ()
5002 lang_expand_expr = (lang_expand_expr_t) do_abort;
5004 /* Initialize the garbage-collector, and string pools. */
5006 ggc_add_rtx_root (&stack_limit_rtx, 1);
5007 ggc_add_tree_root (¤t_function_decl, 1);
5008 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5013 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5014 || debug_info_level == DINFO_LEVEL_VERBOSE
5015 #ifdef VMS_DEBUGGING_INFO
5016 /* Enable line number info for traceback */
5017 || debug_info_level > DINFO_LEVEL_NONE
5019 || flag_test_coverage
5020 || warn_notreached);
5026 init_function_once ();
5027 init_stor_layout_once ();
5028 init_varasm_once ();
5029 init_EXPR_INSN_LIST_cache ();
5031 /* The following initialization functions need to generate rtl, so
5032 provide a dummy function context for them. */
5033 init_dummy_function_start ();
5036 if (flag_caller_saves)
5037 init_caller_save ();
5038 expand_dummy_function_end ();
5041 /* Language-dependent initialization. Returns non-zero on success. */
5043 lang_dependent_init (name)
5046 if (dump_base_name == 0)
5047 dump_base_name = name ? name : "gccdump";
5049 /* Front-end initialization. This hook can assume that GC,
5050 identifier hashes etc. are set up, but debug initialization is
5051 not done yet. This routine must return the original filename
5052 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5053 name = (*lang_hooks.init) (name);
5057 /* Is this duplication necessary? */
5058 name = ggc_strdup (name);
5059 main_input_filename = input_filename = name;
5060 init_asm_output (name);
5062 /* These create various _DECL nodes, so need to be called after the
5063 front end is initialized. */
5067 /* Put an entry on the input file stack for the main input file. */
5068 push_srcloc (input_filename, 0);
5070 /* If dbx symbol table desired, initialize writing it and output the
5071 predefined types. */
5072 timevar_push (TV_SYMOUT);
5074 #ifdef DWARF2_UNWIND_INFO
5075 if (dwarf2out_do_frame ())
5076 dwarf2out_frame_init ();
5079 /* Now we have the correct original filename, we can initialize
5081 (*debug_hooks->init) (name);
5083 timevar_pop (TV_SYMOUT);
5088 /* Clean up: close opened files, etc. */
5093 /* Close the dump files. */
5094 if (flag_gen_aux_info)
5096 fclose (aux_info_file);
5098 unlink (aux_info_file_name);
5101 /* Close non-debugging input and output files. Take special care to note
5102 whether fclose returns an error, since the pages might still be on the
5103 buffer chain while the file is open. */
5107 if (ferror (asm_out_file) != 0)
5108 fatal_io_error ("error writing to %s", asm_file_name);
5109 if (fclose (asm_out_file) != 0)
5110 fatal_io_error ("error closing %s", asm_file_name);
5113 /* Do whatever is necessary to finish printing the graphs. */
5114 if (graph_dump_format != no_graph)
5118 for (i = 0; i < (int) DFI_MAX; ++i)
5119 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5124 sprintf (seq, DUMPFILE_FORMAT, i);
5125 suffix = concat (seq, dump_file[i].extension, NULL);
5126 finish_graph_dump_file (dump_base_name, suffix);
5133 ggc_print_statistics ();
5134 stringpool_statistics ();
5135 dump_tree_statistics ();
5138 /* Free up memory for the benefit of leak detectors. */
5141 /* Language-specific end of compilation actions. */
5142 (*lang_hooks.finish) ();
5145 /* Initialize the compiler, and compile the input file. */
5149 /* The bulk of command line switch processing. */
5152 /* We cannot start timing until after options are processed since that
5153 says if we run timers or not. */
5155 timevar_start (TV_TOTAL);
5157 /* Language-independent initialization. Also sets up GC, identifier
5159 lang_independent_init ();
5161 /* Language-dependent initialization. Returns true on success. */
5162 if (lang_dependent_init (filename))
5167 /* Stop timing and print the times. */
5168 timevar_stop (TV_TOTAL);
5169 timevar_print (stderr);
5172 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5173 Decode command args, then call compile_file.
5174 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5175 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5177 It is not safe to call this function more than once. */
5180 toplev_main (argc, argv)
5186 /* Initialization of GCC's environment, and diagnostics. */
5187 general_init (argv [0]);
5189 /* Parse the options and do minimal processing; basically just
5190 enough to default flags appropriately. */
5191 parse_options_and_default_flags (argc, argv);
5193 /* Exit early if we can (e.g. -help). */
5194 if (!exit_after_options)
5197 if (errorcount || sorrycount)
5198 return (FATAL_EXIT_CODE);
5200 return (SUCCESS_EXIT_CODE);