1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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 "hard-reg-set.h"
56 #include "basic-block.h"
63 #include "diagnostic.h"
67 #include "dwarf2asm.h"
68 #include "integrate.h"
71 #ifdef DWARF_DEBUGGING_INFO
75 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
76 #include "dwarf2out.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
92 /* The extra parameters substantially improve the I/O performance. */
95 vms_fopen (fname, type)
99 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
100 fixed arguments, which matches ANSI's specification but not VAXCRTL's
101 pre-ANSI implementation. This hack circumvents the mismatch problem. */
102 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
105 return (*vmslib_fopen) (fname, type, "mbc=32",
106 "deq=64", "fop=tef", "shr=nil");
108 return (*vmslib_fopen) (fname, type, "mbc=32");
111 #define fopen vms_fopen
114 #ifndef DEFAULT_GDB_EXTENSIONS
115 #define DEFAULT_GDB_EXTENSIONS 1
118 /* If more than one debugging type is supported, you must define
119 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
121 This is one long line cause VAXC can't handle a \-newline. */
122 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
123 #ifndef PREFERRED_DEBUGGING_TYPE
124 You Lose! You must define PREFERRED_DEBUGGING_TYPE!
125 #endif /* no PREFERRED_DEBUGGING_TYPE */
126 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
127 so the following code needn't care. */
128 #ifdef DBX_DEBUGGING_INFO
129 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
131 #ifdef SDB_DEBUGGING_INFO
132 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
134 #ifdef DWARF_DEBUGGING_INFO
135 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
137 #ifdef DWARF2_DEBUGGING_INFO
138 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
140 #ifdef XCOFF_DEBUGGING_INFO
141 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
143 #endif /* More than one debugger format enabled. */
145 /* If still not defined, must have been because no debugging formats
147 #ifndef PREFERRED_DEBUGGING_TYPE
148 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
151 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
152 extern char **environ;
155 /* Carry information from ASM_DECLARE_OBJECT_NAME
156 to ASM_FINISH_DECLARE_OBJECT. */
158 extern int size_directive_output;
159 extern tree last_assemble_variable_decl;
161 static void set_target_switch PARAMS ((const char *));
162 static const char *decl_name PARAMS ((tree, int));
164 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
165 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
166 static void compile_file PARAMS ((const char *));
167 static void display_help PARAMS ((void));
168 static void display_target_options PARAMS ((void));
170 static void decode_d_option PARAMS ((const char *));
171 static int decode_f_option PARAMS ((const char *));
172 static int decode_W_option PARAMS ((const char *));
173 static int decode_g_option PARAMS ((const char *));
174 static unsigned int independent_decode_option PARAMS ((int, char **));
176 static void print_version PARAMS ((FILE *, const char *));
177 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
178 const char *, const char *,
179 const char *, const char *));
180 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
181 const char *, const char *));
183 /* Length of line when printing switch values. */
186 /* Name of program invoked, sans directories. */
188 const char *progname;
190 /* Copy of arguments to toplev_main. */
194 /* Name of current original source file (what was input to cpp).
195 This comes from each #-command in the actual input. */
197 const char *input_filename;
199 /* Name of top-level original source file (what was input to cpp).
200 This comes from the #-command at the beginning of the actual input.
201 If there isn't any there, then this is the cc1 input file name. */
203 const char *main_input_filename;
205 /* Current line number in real source file. */
209 /* Nonzero if it is unsafe to create any new pseudo registers. */
212 /* Stack of currently pending input files. */
214 struct file_stack *input_file_stack;
216 /* Incremented on each change to input_file_stack. */
217 int input_file_stack_tick;
219 /* Name to use as base of names for dump output files. */
221 const char *dump_base_name;
223 /* Bit flags that specify the machine subtype we are compiling for.
224 Bits are tested using macros TARGET_... defined in the tm.h file
225 and set by `-m...' switches. Must be defined in rtlanal.c. */
227 extern int target_flags;
229 /* Debug hooks - dependent upon command line options. */
231 struct gcc_debug_hooks *debug_hooks;
233 /* Describes a dump file. */
235 struct dump_file_info
237 /* The unique extension to apply, e.g. ".jump". */
238 const char *const extension;
240 /* The -d<c> character that enables this dump file. */
241 char const debug_switch;
243 /* True if there is a corresponding graph dump file. */
244 char const graph_dump_p;
246 /* True if the user selected this dump. */
249 /* True if the files have been initialized (ie truncated). */
253 /* Enumerate the extant dump files. */
292 /* Describes all the dump files. Should be kept in order of the
293 pass and in sync with dump_file_index above.
295 Remaining -d letters:
301 struct dump_file_info dump_file[DFI_MAX] =
303 { "rtl", 'r', 0, 0, 0 },
304 { "sibling", 'i', 0, 0, 0 },
305 { "eh", 'h', 0, 0, 0 },
306 { "jump", 'j', 0, 0, 0 },
307 { "ssa", 'e', 1, 0, 0 },
308 { "ssaccp", 'W', 1, 0, 0 },
309 { "ssadce", 'X', 1, 0, 0 },
310 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
311 { "cse", 's', 0, 0, 0 },
312 { "addressof", 'F', 0, 0, 0 },
313 { "gcse", 'G', 1, 0, 0 },
314 { "loop", 'L', 1, 0, 0 },
315 { "cse2", 't', 1, 0, 0 },
316 { "cfg", 'f', 1, 0, 0 },
317 { "bp", 'b', 1, 0, 0 },
318 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
319 { "combine", 'c', 1, 0, 0 },
320 { "ce", 'C', 1, 0, 0 },
321 { "regmove", 'N', 1, 0, 0 },
322 { "sched", 'S', 1, 0, 0 },
323 { "lreg", 'l', 1, 0, 0 },
324 { "greg", 'g', 1, 0, 0 },
325 { "postreload", 'o', 1, 0, 0 },
326 { "flow2", 'w', 1, 0, 0 },
327 { "peephole2", 'z', 1, 0, 0 },
328 { "rnreg", 'n', 1, 0, 0 },
329 { "ce2", 'E', 1, 0, 0 },
330 { "sched2", 'R', 1, 0, 0 },
331 { "stack", 'k', 1, 0, 0 },
332 { "bbro", 'B', 1, 0, 0 },
333 { "mach", 'M', 1, 0, 0 },
334 { "dbr", 'd', 0, 0, 0 },
337 static int open_dump_file PARAMS ((enum dump_file_index, tree));
338 static void close_dump_file PARAMS ((enum dump_file_index,
339 void (*) (FILE *, rtx), rtx));
341 /* Other flags saying which kinds of debugging dump have been requested. */
343 int rtl_dump_and_exit;
344 int flag_print_asm_name;
345 static int version_flag;
346 static char *filename;
347 enum graph_dump_types graph_dump_format;
349 /* Name for output file of assembly code, specified with -o. */
353 /* Value of the -G xx switch, and whether it was passed or not. */
357 /* Type(s) of debugging information we are producing (if any).
358 See flags.h for the definitions of the different possible
359 types of debugging information. */
360 enum debug_info_type write_symbols = NO_DEBUG;
362 /* Level of debugging information we are producing. See flags.h
363 for the definitions of the different possible levels. */
364 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
366 /* Nonzero means use GNU-only extensions in the generated symbolic
367 debugging information. */
368 /* Currently, this only has an effect when write_symbols is set to
369 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
370 int use_gnu_debug_info_extensions = 0;
372 /* Nonzero means do optimizations. -O.
373 Particular numeric values stand for particular amounts of optimization;
374 thus, -O2 stores 2 here. However, the optimizations beyond the basic
375 ones are not controlled directly by this variable. Instead, they are
376 controlled by individual `flag_...' variables that are defaulted
377 based on this variable. */
381 /* Nonzero means optimize for size. -Os.
382 The only valid values are zero and non-zero. When optimize_size is
383 non-zero, optimize defaults to 2, but certain individual code
384 bloating optimizations are disabled. */
386 int optimize_size = 0;
388 /* Nonzero if we should exit after parsing options. */
389 static int exit_after_options = 0;
391 /* The FUNCTION_DECL for the function currently being compiled,
392 or 0 if between functions. */
393 tree current_function_decl;
395 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
397 tree current_function_func_begin_label;
399 /* Pointer to function to compute the name to use to print a declaration.
400 DECL is the declaration in question.
401 VERBOSITY determines what information will be printed:
402 0: DECL_NAME, demangled as necessary.
403 1: and scope information.
404 2: and any other information that might be interesting, such as function
405 parameter types in C++. */
407 const char *(*decl_printable_name) PARAMS ((tree, int));
409 /* Pointer to function to compute rtl for a language-specific tree code. */
411 typedef rtx (*lang_expand_expr_t)
412 PARAMS ((union tree_node *, rtx, enum machine_mode,
413 enum expand_modifier modifier));
415 lang_expand_expr_t lang_expand_expr = 0;
417 tree (*lang_expand_constant) PARAMS ((tree)) = 0;
419 /* Pointer to function to finish handling an incomplete decl at the
420 end of compilation. */
422 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
424 /* Nonzero if doing dwarf2 duplicate elimination. */
426 int flag_eliminate_dwarf2_dups = 0;
428 /* Nonzero if generating code to do profiling. */
430 int profile_flag = 0;
432 /* Nonzero if generating code to do profiling on a line-by-line basis. */
434 int profile_block_flag;
436 /* Nonzero if generating code to profile program flow graph arcs. */
438 int profile_arc_flag = 0;
440 /* Nonzero if generating info for gcov to calculate line test coverage. */
442 int flag_test_coverage = 0;
444 /* Nonzero indicates that branch taken probabilities should be calculated. */
446 int flag_branch_probabilities = 0;
448 /* Nonzero if basic blocks should be reordered. */
450 int flag_reorder_blocks = 0;
452 /* Nonzero if registers should be renamed. */
454 int flag_rename_registers = 0;
456 /* Nonzero for -pedantic switch: warn about anything
457 that standard spec forbids. */
461 /* Temporarily suppress certain warnings.
462 This is set while reading code from a system header file. */
464 int in_system_header = 0;
466 /* Don't print functions as they are compiled. -quiet. */
470 /* Print times taken by the various passes. -ftime-report. */
474 /* Print memory still in use at end of compilation (which may have little
475 to do with peak memory consumption). -fmem-report. */
479 /* Non-zero means to collect statistics which might be expensive
480 and to print them when we are done. */
481 int flag_detailed_statistics = 0;
486 /* Nonzero means `char' should be signed. */
488 int flag_signed_char;
490 /* Nonzero means give an enum type only as many bytes as it needs. */
492 int flag_short_enums;
494 /* Nonzero for -fcaller-saves: allocate values in regs that need to
495 be saved across function calls, if that produces overall better code.
496 Optional now, so people can test it. */
498 #ifdef DEFAULT_CALLER_SAVES
499 int flag_caller_saves = 1;
501 int flag_caller_saves = 0;
504 /* Nonzero if structures and unions should be returned in memory.
506 This should only be defined if compatibility with another compiler or
507 with an ABI is needed, because it results in slower code. */
509 #ifndef DEFAULT_PCC_STRUCT_RETURN
510 #define DEFAULT_PCC_STRUCT_RETURN 1
513 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
515 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
517 /* Nonzero for -fforce-mem: load memory value into a register
518 before arithmetic on it. This makes better cse but slower compilation. */
520 int flag_force_mem = 0;
522 /* Nonzero for -fforce-addr: load memory address into a register before
523 reference to memory. This makes better cse but slower compilation. */
525 int flag_force_addr = 0;
527 /* Nonzero for -fdefer-pop: don't pop args after each function call;
528 instead save them up to pop many calls' args with one insns. */
530 int flag_defer_pop = 0;
532 /* Nonzero for -ffloat-store: don't allocate floats and doubles
533 in extended-precision registers. */
535 int flag_float_store = 0;
537 /* Nonzero for -fcse-follow-jumps:
538 have cse follow jumps to do a more extensive job. */
540 int flag_cse_follow_jumps;
542 /* Nonzero for -fcse-skip-blocks:
543 have cse follow a branch around a block. */
544 int flag_cse_skip_blocks;
546 /* Nonzero for -fexpensive-optimizations:
547 perform miscellaneous relatively-expensive optimizations. */
548 int flag_expensive_optimizations;
550 /* Nonzero for -fthread-jumps:
551 have jump optimize output of loop. */
553 int flag_thread_jumps;
555 /* Nonzero enables strength-reduction in loop.c. */
557 int flag_strength_reduce = 0;
559 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
560 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
561 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
564 int flag_unroll_loops;
566 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
567 This is generally not a win. */
569 int flag_unroll_all_loops;
571 /* Nonzero forces all invariant computations in loops to be moved
574 int flag_move_all_movables = 0;
576 /* Nonzero forces all general induction variables in loops to be
579 int flag_reduce_all_givs = 0;
581 /* Nonzero to perform full register move optimization passes. This is the
584 int flag_regmove = 0;
586 /* Nonzero for -fwritable-strings:
587 store string constants in data segment and don't uniquize them. */
589 int flag_writable_strings = 0;
591 /* Nonzero means don't put addresses of constant functions in registers.
592 Used for compiling the Unix kernel, where strange substitutions are
593 done on the assembly output. */
595 int flag_no_function_cse = 0;
597 /* Nonzero for -fomit-frame-pointer:
598 don't make a frame pointer in simple functions that don't require one. */
600 int flag_omit_frame_pointer = 0;
602 /* Nonzero means place each function into its own section on those platforms
603 which support arbitrary section names and unlimited numbers of sections. */
605 int flag_function_sections = 0;
607 /* ... and similar for data. */
609 int flag_data_sections = 0;
611 /* Nonzero to inhibit use of define_optimization peephole opts. */
613 int flag_no_peephole = 0;
615 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
617 int flag_optimize_sibling_calls = 0;
619 /* Nonzero means the front end generally wants `errno' maintained by math
620 operations, like built-in SQRT. */
622 int flag_errno_math = 1;
624 /* Nonzero means that unsafe floating-point math optimizations are allowed
625 for the sake of speed. IEEE compliance is not guaranteed, and operations
626 are allowed to assume that their arguments and results are "normal"
627 (e.g., nonnegative for SQRT). */
629 int flag_unsafe_math_optimizations = 0;
631 /* Zero means that floating-point math operations cannot generate a
632 (user-visible) trap. This is the case, for example, in nonstop
633 IEEE 754 arithmetic. */
635 int flag_trapping_math = 1;
637 /* 0 means straightforward implementation of complex divide acceptable.
638 1 means wide ranges of inputs must work for complex divide.
639 2 means C99-like requirements for complex divide (not yet implemented). */
641 int flag_complex_divide_method = 0;
643 /* Nonzero means all references through pointers are volatile. */
647 /* Nonzero means treat all global and extern variables as volatile. */
649 int flag_volatile_global;
651 /* Nonzero means treat all static variables as volatile. */
653 int flag_volatile_static;
655 /* Nonzero means just do syntax checking; don't output anything. */
657 int flag_syntax_only = 0;
659 /* Nonzero means perform global cse. */
661 static int flag_gcse;
663 /* Nonzero means to use global dataflow analysis to eliminate
664 useless null pointer tests. */
666 static int flag_delete_null_pointer_checks;
668 /* Nonzero means to do the enhanced load motion during gcse, which trys
669 to hoist loads by not killing them when a store to the same location
672 int flag_gcse_lm = 1;
674 /* Nonzero means to perform store motion after gcse, which will try to
675 move stores closer to the exit block. Its not very effective without
678 int flag_gcse_sm = 1;
680 /* Nonzero means to rerun cse after loop optimization. This increases
681 compilation time about 20% and picks up a few more common expressions. */
683 static int flag_rerun_cse_after_loop;
685 /* Nonzero means to run loop optimizations twice. */
687 int flag_rerun_loop_opt;
689 /* Nonzero for -finline-functions: ok to inline functions that look like
690 good inline candidates. */
692 int flag_inline_functions;
694 /* Nonzero for -fkeep-inline-functions: even if we make a function
695 go inline everywhere, keep its definition around for debugging
698 int flag_keep_inline_functions;
700 /* Nonzero means that functions will not be inlined. */
704 /* Nonzero means that we should emit static const variables
705 regardless of whether or not optimization is turned on. */
707 int flag_keep_static_consts = 1;
709 /* Nonzero means we should be saving declaration info into a .X file. */
711 int flag_gen_aux_info = 0;
713 /* Specified name of aux-info file. */
715 static char *aux_info_file_name;
717 /* Nonzero means make the text shared if supported. */
719 int flag_shared_data;
721 /* Nonzero means schedule into delayed branch slots if supported. */
723 int flag_delayed_branch;
725 /* Nonzero if we are compiling pure (sharable) code.
726 Value is 1 if we are doing reasonable (i.e. simple
727 offset into offset table) pic. Value is 2 if we can
728 only perform register offsets. */
732 /* Nonzero means generate extra code for exception handling and enable
733 exception handling. */
737 /* Nonzero means generate frame unwind info table when supported. */
739 int flag_unwind_tables = 0;
741 /* Nonzero means don't place uninitialized global data in common storage
746 /* Nonzero means pretend it is OK to examine bits of target floats,
747 even if that isn't true. The resulting code will have incorrect constants,
748 but the same series of instructions that the native compiler would make. */
750 int flag_pretend_float;
752 /* Nonzero means change certain warnings into errors.
753 Usually these are warnings about failure to conform to some standard. */
755 int flag_pedantic_errors = 0;
757 /* flag_schedule_insns means schedule insns within basic blocks (before
759 flag_schedule_insns_after_reload means schedule insns after
762 int flag_schedule_insns = 0;
763 int flag_schedule_insns_after_reload = 0;
765 /* The following flags have effect only for scheduling before register
768 flag_schedule_interblock means schedule insns accross basic blocks.
769 flag_schedule_speculative means allow speculative motion of non-load insns.
770 flag_schedule_speculative_load means allow speculative motion of some
772 flag_schedule_speculative_load_dangerous allows speculative motion of more
775 int flag_schedule_interblock = 1;
776 int flag_schedule_speculative = 1;
777 int flag_schedule_speculative_load = 0;
778 int flag_schedule_speculative_load_dangerous = 0;
780 int flag_single_precision_constant;
782 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
783 by a cheaper branch on a count register. */
784 int flag_branch_on_count_reg = 1;
786 /* -finhibit-size-directive inhibits output of .size for ELF.
787 This is used only for compiling crtstuff.c,
788 and it may be extended to other effects
789 needed for crtstuff.c on other systems. */
790 int flag_inhibit_size_directive = 0;
792 /* -fverbose-asm causes extra commentary information to be produced in
793 the generated assembly code (to make it more readable). This option
794 is generally only of use to those who actually need to read the
795 generated assembly code (perhaps while debugging the compiler itself).
796 -fno-verbose-asm, the default, causes the extra information
797 to be omitted and is useful when comparing two assembler files. */
799 int flag_verbose_asm = 0;
801 /* -dA causes debug commentary information to be produced in
802 the generated assembly code (to make it more readable). This option
803 is generally only of use to those who actually need to read the
804 generated assembly code (perhaps while debugging the compiler itself).
805 Currently, this switch is only used by dwarfout.c; however, it is intended
806 to be a catchall for printing debug information in the assembler file. */
808 int flag_debug_asm = 0;
810 /* -dP causes the rtl to be emitted as a comment in assembly. */
812 int flag_dump_rtl_in_asm = 0;
814 /* -fgnu-linker specifies use of the GNU linker for initializations.
815 (Or, more generally, a linker that handles initializations.)
816 -fno-gnu-linker says that collect2 will be used. */
818 int flag_gnu_linker = 0;
820 int flag_gnu_linker = 1;
826 /* Enable ssa conditional constant propagation. */
827 int flag_ssa_ccp = 0;
829 /* Enable ssa aggressive dead code elimination. */
830 int flag_ssa_dce = 0;
832 /* Tag all structures with __attribute__(packed). */
833 int flag_pack_struct = 0;
835 /* Emit code to check for stack overflow; also may cause large objects
836 to be allocated dynamically. */
837 int flag_stack_check;
839 /* When non-NULL, indicates that whenever space is allocated on the
840 stack, the resulting stack pointer must not pass this
841 address---that is, for stacks that grow downward, the stack pointer
842 must always be greater than or equal to this address; for stacks
843 that grow upward, the stack pointer must be less than this address.
844 At present, the rtx may be either a REG or a SYMBOL_REF, although
845 the support provided depends on the backend. */
848 /* -fcheck-memory-usage causes extra code to be generated in order to check
849 memory accesses. This is used by a detector of bad memory accesses such
851 int flag_check_memory_usage = 0;
853 /* -fprefix-function-name causes function name to be prefixed. This
854 can be used with -fcheck-memory-usage to isolate code compiled with
855 -fcheck-memory-usage. */
856 int flag_prefix_function_name = 0;
858 /* 0 if pointer arguments may alias each other. True in C.
859 1 if pointer arguments may not alias each other but may alias
861 2 if pointer arguments may not alias each other and may not
862 alias global variables. True in Fortran.
863 This defaults to 0 for C. */
864 int flag_argument_noalias = 0;
866 /* Nonzero if we should do (language-dependent) alias analysis.
867 Typically, this analysis will assume that expressions of certain
868 types do not alias expressions of certain other types. Only used
869 if alias analysis (in general) is enabled. */
870 int flag_strict_aliasing = 0;
872 /* Instrument functions with calls at entry and exit, for profiling. */
873 int flag_instrument_function_entry_exit = 0;
875 /* Nonzero means ignore `#ident' directives. 0 means handle them.
876 On SVR4 targets, it also controls whether or not to emit a
877 string identifying the compiler. */
879 int flag_no_ident = 0;
881 /* This will perform a peephole pass before sched2. */
882 int flag_peephole2 = 0;
884 /* This will try to guess branch probabilities. */
885 int flag_guess_branch_prob = 0;
887 /* -fbounded-pointers causes gcc to compile pointers as composite
888 objects occupying three words: the pointer value, the base address
889 of the referent object, and the address immediately beyond the end
890 of the referent object. The base and extent allow us to perform
891 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
892 int flag_bounded_pointers = 0;
894 /* -fcheck-bounds causes gcc to generate array bounds checks.
895 For C, C++: defaults to value of flag_bounded_pointers.
896 For ObjC: defaults to off.
897 For Java: defaults to on.
898 For Fortran: defaults to off.
899 For CHILL: defaults to off. */
900 int flag_bounds_check = 0;
902 /* If one, renumber instruction UIDs to reduce the number of
903 unused UIDs if there are a lot of instructions. If greater than
904 one, unconditionally renumber instruction UIDs. */
905 int flag_renumber_insns = 1;
907 /* Values of the -falign-* flags: how much to align labels in code.
908 0 means `use default', 1 means `don't align'.
909 For each variable, there is an _log variant which is the power
910 of two not less than the variable, for .align output. */
917 int align_labels_log;
919 int align_functions_log;
921 /* Table of supported debugging formats. */
925 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
926 constant expression, we use NO_DEBUG in its place. */
927 enum debug_info_type debug_type;
928 int use_extensions_p;
929 const char *description;
933 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
934 N_("Generate debugging info in default format") },
935 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
936 #ifdef DBX_DEBUGGING_INFO
937 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
938 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
940 #ifdef DWARF_DEBUGGING_INFO
941 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
942 { "dwarf+", DWARF_DEBUG, 1,
943 N_("Generate extended DWARF-1 format debug info") },
945 #ifdef DWARF2_DEBUGGING_INFO
946 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
948 #ifdef XCOFF_DEBUGGING_INFO
949 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
950 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
952 #ifdef SDB_DEBUGGING_INFO
953 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
963 const char *description;
965 lang_independent_options;
969 /* Add or remove a leading underscore from user symbols. */
970 int flag_leading_underscore = -1;
972 /* The user symbol prefix after having resolved same. */
973 const char *user_label_prefix;
975 static const param_info lang_independent_params[] = {
976 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
977 { OPTION, DEFAULT, HELP },
978 #include "params.def"
983 /* A default for same. */
984 #ifndef USER_LABEL_PREFIX
985 #define USER_LABEL_PREFIX ""
988 /* Table of language-independent -f options.
989 STRING is the option name. VARIABLE is the address of the variable.
990 ON_VALUE is the value to store in VARIABLE
991 if `-fSTRING' is seen as an option.
992 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
994 lang_independent_options f_options[] =
996 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
997 N_("Perform DWARF2 duplicate elimination") },
998 {"float-store", &flag_float_store, 1,
999 N_("Do not store floats in registers") },
1000 {"volatile", &flag_volatile, 1,
1001 N_("Consider all mem refs through pointers as volatile") },
1002 {"volatile-global", &flag_volatile_global, 1,
1003 N_("Consider all mem refs to global data to be volatile") },
1004 {"volatile-static", &flag_volatile_static, 1,
1005 N_("Consider all mem refs to static data to be volatile") },
1006 {"defer-pop", &flag_defer_pop, 1,
1007 N_("Defer popping functions args from stack until later") },
1008 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1009 N_("When possible do not generate stack frames") },
1010 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1011 N_("Optimize sibling and tail recursive calls") },
1012 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1013 N_("When running CSE, follow jumps to their targets") },
1014 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1015 N_("When running CSE, follow conditional jumps") },
1016 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1017 N_("Perform a number of minor, expensive optimisations") },
1018 {"thread-jumps", &flag_thread_jumps, 1,
1019 N_("Perform jump threading optimisations") },
1020 {"strength-reduce", &flag_strength_reduce, 1,
1021 N_("Perform strength reduction optimisations") },
1022 {"unroll-loops", &flag_unroll_loops, 1,
1023 N_("Perform loop unrolling when iteration count is known") },
1024 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1025 N_("Perform loop unrolling for all loops") },
1026 {"move-all-movables", &flag_move_all_movables, 1,
1027 N_("Force all loop invariant computations out of loops") },
1028 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1029 N_("Strength reduce all loop general induction variables") },
1030 {"writable-strings", &flag_writable_strings, 1,
1031 N_("Store strings in writable data section") },
1032 {"peephole", &flag_no_peephole, 0,
1033 N_("Enable machine specific peephole optimisations") },
1034 {"force-mem", &flag_force_mem, 1,
1035 N_("Copy memory operands into registers before using") },
1036 {"force-addr", &flag_force_addr, 1,
1037 N_("Copy memory address constants into regs before using") },
1038 {"function-cse", &flag_no_function_cse, 0,
1039 N_("Allow function addresses to be held in registers") },
1040 {"inline-functions", &flag_inline_functions, 1,
1041 N_("Integrate simple functions into their callers") },
1042 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1043 N_("Generate code for funcs even if they are fully inlined") },
1044 {"inline", &flag_no_inline, 0,
1045 N_("Pay attention to the 'inline' keyword") },
1046 {"keep-static-consts", &flag_keep_static_consts, 1,
1047 N_("Emit static const variables even if they are not used") },
1048 {"syntax-only", &flag_syntax_only, 1,
1049 N_("Check for syntax errors, then stop") },
1050 {"shared-data", &flag_shared_data, 1,
1051 N_("Mark data as shared rather than private") },
1052 {"caller-saves", &flag_caller_saves, 1,
1053 N_("Enable saving registers around function calls") },
1054 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1055 N_("Return 'short' aggregates in memory, not registers") },
1056 {"reg-struct-return", &flag_pcc_struct_return, 0,
1057 N_("Return 'short' aggregates in registers") },
1058 {"delayed-branch", &flag_delayed_branch, 1,
1059 N_("Attempt to fill delay slots of branch instructions") },
1060 {"gcse", &flag_gcse, 1,
1061 N_("Perform the global common subexpression elimination") },
1062 {"gcse-lm", &flag_gcse_lm, 1,
1063 N_("Perform enhanced load motion during global subexpression elimination") },
1064 {"gcse-sm", &flag_gcse_sm, 1,
1065 N_("Perform store motion after global subexpression elimination") },
1066 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1067 N_("Run CSE pass after loop optimisations") },
1068 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1069 N_("Run the loop optimiser twice") },
1070 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1071 N_("Delete useless null pointer checks") },
1072 {"pretend-float", &flag_pretend_float, 1,
1073 N_("Pretend that host and target use the same FP format") },
1074 {"schedule-insns", &flag_schedule_insns, 1,
1075 N_("Reschedule instructions before register allocation") },
1076 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1077 N_("Reschedule instructions after register allocation") },
1078 {"sched-interblock",&flag_schedule_interblock, 1,
1079 N_("Enable scheduling across basic blocks") },
1080 {"sched-spec",&flag_schedule_speculative, 1,
1081 N_("Allow speculative motion of non-loads") },
1082 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1083 N_("Allow speculative motion of some loads") },
1084 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1085 N_("Allow speculative motion of more loads") },
1086 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1087 N_("Replace add,compare,branch with branch on count reg") },
1088 {"pic", &flag_pic, 1,
1089 N_("Generate position independent code, if possible") },
1090 {"PIC", &flag_pic, 2, ""},
1091 {"exceptions", &flag_exceptions, 1,
1092 N_("Enable exception handling") },
1093 {"unwind-tables", &flag_unwind_tables, 1,
1094 N_("Just generate unwind tables for exception handling") },
1095 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1096 N_("Support synchronous non-call exceptions") },
1097 {"profile-arcs", &profile_arc_flag, 1,
1098 N_("Insert arc based program profiling code") },
1099 {"test-coverage", &flag_test_coverage, 1,
1100 N_("Create data files needed by gcov") },
1101 {"branch-probabilities", &flag_branch_probabilities, 1,
1102 N_("Use profiling information for branch probabilities") },
1103 {"reorder-blocks", &flag_reorder_blocks, 1,
1104 N_("Reorder basic blocks to improve code placement") },
1105 {"rename-registers", &flag_rename_registers, 1,
1106 N_("Do the register renaming optimization pass") },
1107 {"common", &flag_no_common, 0,
1108 N_("Do not put unitialised globals in the common section") },
1109 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1110 N_("Do not generate .size directives") },
1111 {"function-sections", &flag_function_sections, 1,
1112 N_("place each function into its own section") },
1113 {"data-sections", &flag_data_sections, 1,
1114 N_("place data items into their own section") },
1115 {"verbose-asm", &flag_verbose_asm, 1,
1116 N_("Add extra commentry to assembler output") },
1117 {"gnu-linker", &flag_gnu_linker, 1,
1118 N_("Output GNU ld formatted global initialisers") },
1119 {"regmove", &flag_regmove, 1,
1120 N_("Enables a register move optimisation") },
1121 {"optimize-register-move", &flag_regmove, 1,
1122 N_("Do the full regmove optimization pass") },
1123 {"pack-struct", &flag_pack_struct, 1,
1124 N_("Pack structure members together without holes") },
1125 {"stack-check", &flag_stack_check, 1,
1126 N_("Insert stack checking code into the program") },
1127 {"argument-alias", &flag_argument_noalias, 0,
1128 N_("Specify that arguments may alias each other & globals") },
1129 {"argument-noalias", &flag_argument_noalias, 1,
1130 N_("Assume arguments may alias globals but not each other") },
1131 {"argument-noalias-global", &flag_argument_noalias, 2,
1132 N_("Assume arguments do not alias each other or globals") },
1133 {"strict-aliasing", &flag_strict_aliasing, 1,
1134 N_("Assume strict aliasing rules apply") },
1135 {"align-loops", &align_loops, 0,
1136 N_("Align the start of loops") },
1137 {"align-jumps", &align_jumps, 0,
1138 N_("Align labels which are only reached by jumping") },
1139 {"align-labels", &align_labels, 0,
1140 N_("Align all labels") },
1141 {"align-functions", &align_functions, 0,
1142 N_("Align the start of functions") },
1143 {"check-memory-usage", &flag_check_memory_usage, 1,
1144 N_("Generate code to check every memory access") },
1145 {"prefix-function-name", &flag_prefix_function_name, 1,
1146 N_("Add a prefix to all function names") },
1147 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1148 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1149 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1150 N_("Instrument function entry/exit with profiling calls") },
1151 {"ssa", &flag_ssa, 1,
1152 N_("Enable SSA optimizations") },
1153 {"ssa-ccp", &flag_ssa_ccp, 1,
1154 N_("Enable SSA conditonal constant propagation") },
1155 {"ssa-dce", &flag_ssa_dce, 1,
1156 N_("Enable aggressive SSA dead code elimination") },
1157 {"leading-underscore", &flag_leading_underscore, 1,
1158 N_("External symbols have a leading underscore") },
1159 {"ident", &flag_no_ident, 0,
1160 N_("Process #ident directives") },
1161 { "peephole2", &flag_peephole2, 1,
1162 N_("Enables an rtl peephole pass run before sched2") },
1163 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1164 N_("Enables guessing of branch probabilities") },
1165 {"math-errno", &flag_errno_math, 1,
1166 N_("Set errno after built-in math functions") },
1167 {"trapping-math", &flag_trapping_math, 1,
1168 N_("Floating-point operations can trap") },
1169 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1170 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1171 {"bounded-pointers", &flag_bounded_pointers, 1,
1172 N_("Compile pointers as triples: value, base & end") },
1173 {"bounds-check", &flag_bounds_check, 1,
1174 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1175 {"single-precision-constant", &flag_single_precision_constant, 1,
1176 N_("Convert floating point constant to single precision constant") },
1177 {"time-report", &time_report, 1,
1178 N_("Report time taken by each compiler pass at end of run") },
1179 {"mem-report", &mem_report, 1,
1180 N_("Report on permanent memory allocation at end of run") },
1181 { "trapv", &flag_trapv, 1,
1182 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1185 /* Table of language-specific options. */
1187 static struct lang_opt
1190 const char *description;
1192 documented_lang_options[] =
1194 /* In order not to overload the --help output, the convention
1195 used here is to only describe those options which are not
1196 enabled by default. */
1199 N_("Compile just for ISO C89") },
1200 { "-fallow-single-precision",
1201 N_("Do not promote floats to double if using -traditional") },
1203 N_("Determine language standard") },
1205 { "-fsigned-bitfields", "" },
1206 { "-funsigned-bitfields",
1207 N_("Make bitfields by unsigned by default") },
1208 { "-fno-signed-bitfields", "" },
1209 { "-fno-unsigned-bitfields","" },
1211 N_("Make 'char' be signed by default") },
1212 { "-funsigned-char",
1213 N_("Make 'char' be unsigned by default") },
1214 { "-fno-signed-char", "" },
1215 { "-fno-unsigned-char", "" },
1217 { "-ftraditional", "" },
1219 N_("Attempt to support traditional K&R style C") },
1220 { "-fnotraditional", "" },
1221 { "-fno-traditional", "" },
1225 N_("Do not recognise the 'asm' keyword") },
1226 { "-fbuiltin", "" },
1228 N_("Do not recognise any built in functions") },
1230 N_("Assume normal C execution environment") },
1231 { "-fno-hosted", "" },
1233 N_("Assume that standard libraries & main might not exist") },
1234 { "-fno-freestanding", "" },
1235 { "-fcond-mismatch",
1236 N_("Allow different types as args of ? operator") },
1237 { "-fno-cond-mismatch", "" },
1238 { "-fdollars-in-identifiers",
1239 N_("Allow the use of $ inside identifiers") },
1240 { "-fno-dollars-in-identifiers", "" },
1241 { "-fpreprocessed", "" },
1242 { "-fno-preprocessed", "" },
1244 N_("Use the same size for double as for float") },
1245 { "-fno-short-double", "" },
1247 N_("Use the smallest fitting integer to hold enums") },
1248 { "-fno-short-enums", "" },
1250 N_("Override the underlying type for wchar_t to `unsigned short'") },
1251 { "-fno-short-wchar", "" },
1254 N_("Enable most warning messages") },
1255 { "-Wbad-function-cast",
1256 N_("Warn about casting functions to incompatible types") },
1257 { "-Wno-bad-function-cast", "" },
1258 { "-Wno-missing-noreturn", "" },
1259 { "-Wmissing-format-attribute",
1260 N_("Warn about functions which might be candidates for format attributes") },
1261 { "-Wno-missing-format-attribute", "" },
1263 N_("Warn about casts which discard qualifiers") },
1264 { "-Wno-cast-qual", "" },
1265 { "-Wchar-subscripts",
1266 N_("Warn about subscripts whose type is 'char'") },
1267 { "-Wno-char-subscripts", "" },
1269 N_("Warn if nested comments are detected") },
1270 { "-Wno-comment", "" },
1272 N_("Warn if nested comments are detected") },
1273 { "-Wno-comments", "" },
1275 N_("Warn about possibly confusing type conversions") },
1276 { "-Wno-conversion", "" },
1278 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1279 { "-Wno-format", "" },
1280 { "-Wformat-y2k", "" },
1281 { "-Wno-format-y2k",
1282 N_("Don't warn about strftime formats yielding 2 digit years") },
1283 { "-Wformat-extra-args", "" },
1284 { "-Wno-format-extra-args",
1285 N_("Don't warn about too many arguments to format functions") },
1286 { "-Wformat-nonliteral",
1287 N_("Warn about non-string-literal format strings") },
1288 { "-Wno-format-nonliteral", "" },
1289 { "-Wformat-security",
1290 N_("Warn about possible security problems with format functions") },
1291 { "-Wno-format-security", "" },
1292 { "-Wimplicit-function-declaration",
1293 N_("Warn about implicit function declarations") },
1294 { "-Wno-implicit-function-declaration", "" },
1295 { "-Werror-implicit-function-declaration", "" },
1297 N_("Warn when a declaration does not specify a type") },
1298 { "-Wno-implicit-int", "" },
1299 { "-Wimplicit", "" },
1300 { "-Wno-implicit", "" },
1302 N_("Warn about the use of the #import directive") },
1303 { "-Wno-import", "" },
1304 { "-Wlong-long","" },
1306 N_("Do not warn about using 'long long' when -pedantic") },
1308 N_("Warn about suspicious declarations of main") },
1309 { "-Wno-main", "" },
1310 { "-Wmissing-braces",
1311 N_("Warn about possibly missing braces around initialisers") },
1312 { "-Wno-missing-braces", "" },
1313 { "-Wmissing-declarations",
1314 N_("Warn about global funcs without previous declarations") },
1315 { "-Wno-missing-declarations", "" },
1316 { "-Wmissing-prototypes",
1317 N_("Warn about global funcs without prototypes") },
1318 { "-Wno-missing-prototypes", "" },
1320 N_("Warn about use of multicharacter literals") },
1321 { "-Wno-multichar", "" },
1322 { "-Wnested-externs",
1323 N_("Warn about externs not at file scope level") },
1324 { "-Wno-nested-externs", "" },
1326 N_("Warn about possible missing parentheses") },
1327 { "-Wno-parentheses", "" },
1328 { "-Wsequence-point",
1329 N_("Warn about possible violations of sequence point rules") },
1330 { "-Wno-sequence-point", "" },
1331 { "-Wpointer-arith",
1332 N_("Warn about function pointer arithmetic") },
1333 { "-Wno-pointer-arith", "" },
1334 { "-Wredundant-decls",
1335 N_("Warn about multiple declarations of the same object") },
1336 { "-Wno-redundant-decls", "" },
1338 N_("Warn about signed/unsigned comparisons") },
1339 { "-Wno-sign-compare", "" },
1341 N_("Warn about testing equality of floating point numbers") },
1342 { "-Wno-float-equal", "" },
1343 { "-Wunknown-pragmas",
1344 N_("Warn about unrecognized pragmas") },
1345 { "-Wno-unknown-pragmas", "" },
1346 { "-Wstrict-prototypes",
1347 N_("Warn about non-prototyped function decls") },
1348 { "-Wno-strict-prototypes", "" },
1350 N_("Warn about constructs whose meaning change in ISO C") },
1351 { "-Wno-traditional", "" },
1353 N_("Warn when trigraphs are encountered") },
1354 { "-Wno-trigraphs", "" },
1356 { "-Wno-undef", "" },
1357 { "-Wwrite-strings",
1358 N_("Mark strings as 'const char *'") },
1359 { "-Wno-write-strings", "" },
1361 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1363 #include "options.h"
1367 /* Here is a table, controlled by the tm.h file, listing each -m switch
1368 and which bits in `target_switches' it should set or clear.
1369 If VALUE is positive, it is bits to set.
1370 If VALUE is negative, -VALUE is bits to clear.
1371 (The sign bit is not used so there is no confusion.) */
1377 const char *description;
1379 target_switches [] = TARGET_SWITCHES;
1381 /* This table is similar, but allows the switch to have a value. */
1383 #ifdef TARGET_OPTIONS
1387 const char **variable;
1388 const char *description;
1390 target_options [] = TARGET_OPTIONS;
1393 /* Options controlling warnings. */
1395 /* Don't print warning messages. -w. */
1397 int inhibit_warnings = 0;
1399 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1401 int warn_system_headers = 0;
1403 /* Print various extra warnings. -W. */
1405 int extra_warnings = 0;
1407 /* Treat warnings as errors. -Werror. */
1409 int warnings_are_errors = 0;
1411 /* Nonzero to warn about unused variables, functions et.al. */
1413 int warn_unused_function;
1414 int warn_unused_label;
1415 int warn_unused_parameter;
1416 int warn_unused_variable;
1417 int warn_unused_value;
1420 set_Wunused (setting)
1423 warn_unused_function = setting;
1424 warn_unused_label = setting;
1425 /* Unused function parameter warnings are reported when either ``-W
1426 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1427 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1429 warn_unused_parameter = 0;
1430 else if (!warn_unused_parameter)
1431 warn_unused_parameter = -1;
1432 warn_unused_variable = setting;
1433 warn_unused_value = setting;
1436 /* Nonzero to warn about code which is never reached. */
1438 int warn_notreached;
1440 /* Nonzero to warn about variables used before they are initialized. */
1442 int warn_uninitialized;
1444 /* Nonzero means warn about all declarations which shadow others. */
1448 /* Warn if a switch on an enum fails to have a case for every enum value. */
1452 /* Nonzero means warn about function definitions that default the return type
1453 or that use a null return and have a return-type other than void. */
1455 int warn_return_type;
1457 /* Nonzero means warn about pointer casts that increase the required
1458 alignment of the target type (and might therefore lead to a crash
1459 due to a misaligned access). */
1461 int warn_cast_align;
1463 /* Nonzero means warn about any objects definitions whose size is larger
1464 than N bytes. Also want about function definitions whose returned
1465 values are larger than N bytes. The value N is in `larger_than_size'. */
1467 int warn_larger_than;
1468 HOST_WIDE_INT larger_than_size;
1470 /* Nonzero means warn if inline function is too large. */
1474 /* Warn if a function returns an aggregate,
1475 since there are often incompatible calling conventions for doing this. */
1477 int warn_aggregate_return;
1479 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1483 /* Warn when gcc pads a structure to an alignment boundary. */
1487 /* Warn when an optimization pass is disabled. */
1489 int warn_disabled_optimization;
1491 /* Warn about functions which might be candidates for attribute noreturn. */
1493 int warn_missing_noreturn;
1495 /* Likewise for -W. */
1497 lang_independent_options W_options[] =
1499 {"unused-function", &warn_unused_function, 1,
1500 N_("Warn when a function is unused") },
1501 {"unused-label", &warn_unused_label, 1,
1502 N_("Warn when a label is unused") },
1503 {"unused-parameter", &warn_unused_parameter, 1,
1504 N_("Warn when a function parameter is unused") },
1505 {"unused-variable", &warn_unused_variable, 1,
1506 N_("Warn when a variable is unused") },
1507 {"unused-value", &warn_unused_value, 1,
1508 N_("Warn when an expression value is unused") },
1509 {"system-headers", &warn_system_headers, 1,
1510 N_("Do not suppress warnings from system headers") },
1511 {"error", &warnings_are_errors, 1,
1512 N_("Treat all warnings as errors") },
1513 {"shadow", &warn_shadow, 1,
1514 N_("Warn when one local variable shadows another") },
1515 {"switch", &warn_switch, 1,
1516 N_("Warn about enumerated switches missing a specific case") },
1517 {"aggregate-return", &warn_aggregate_return, 1,
1518 N_("Warn about returning structures, unions or arrays") },
1519 {"cast-align", &warn_cast_align, 1,
1520 N_("Warn about pointer casts which increase alignment") },
1521 {"unreachable-code", &warn_notreached, 1,
1522 N_("Warn about code that will never be executed") },
1523 {"uninitialized", &warn_uninitialized, 1,
1524 N_("Warn about unitialized automatic variables") },
1525 {"inline", &warn_inline, 1,
1526 N_("Warn when an inlined function cannot be inlined") },
1527 {"packed", &warn_packed, 1,
1528 N_("Warn when the packed attribute has no effect on struct layout") },
1529 {"padded", &warn_padded, 1,
1530 N_("Warn when padding is required to align struct members") },
1531 {"disabled-optimization", &warn_disabled_optimization, 1,
1532 N_("Warn when an optimization pass is disabled") },
1533 {"missing-noreturn", &warn_missing_noreturn, 1,
1534 N_("Warn about functions which might be candidates for attribute noreturn") }
1537 /* The following routines are useful in setting all the flags that
1538 -ffast-math and -fno-fast-math imply. */
1541 set_fast_math_flags ()
1543 flag_trapping_math = 0;
1544 flag_unsafe_math_optimizations = 1;
1545 flag_errno_math = 0;
1549 set_no_fast_math_flags ()
1551 flag_trapping_math = 1;
1552 flag_unsafe_math_optimizations = 0;
1553 flag_errno_math = 1;
1557 /* Output files for assembler code (real compiler output)
1558 and debugging dumps. */
1561 FILE *aux_info_file;
1562 FILE *rtl_dump_file = NULL;
1564 /* Decode the string P as an integral parameter.
1565 If the string is indeed an integer return its numeric value else
1566 issue an Invalid Option error for the option PNAME and return DEFVAL.
1567 If PNAME is zero just return DEFVAL, do not call error. */
1570 read_integral_parameter (p, pname, defval)
1575 const char *endp = p;
1579 if (*endp >= '0' && *endp <= '9')
1588 error ("Invalid option `%s'", pname);
1596 /* This is the default decl_printable_name function. */
1599 decl_name (decl, verbosity)
1601 int verbosity ATTRIBUTE_UNUSED;
1603 return IDENTIFIER_POINTER (DECL_NAME (decl));
1607 /* This calls abort and is used to avoid problems when abort if a macro.
1608 It is used when we need to pass the address of abort. */
1616 /* When `malloc.c' is compiled with `rcheck' defined,
1617 it calls this function to report clobberage. */
1621 const char *s ATTRIBUTE_UNUSED;
1626 /* Return the logarithm of X, base 2, considering X unsigned,
1627 if X is a power of 2. Otherwise, returns -1.
1629 This should be used via the `exact_log2' macro. */
1633 register unsigned HOST_WIDE_INT x;
1635 register int log = 0;
1636 /* Test for 0 or a power of 2. */
1637 if (x == 0 || x != (x & -x))
1639 while ((x >>= 1) != 0)
1644 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1645 If X is 0, return -1.
1647 This should be used via the floor_log2 macro. */
1651 register unsigned HOST_WIDE_INT x;
1653 register int log = -1;
1660 static int float_handler_set;
1662 jmp_buf float_handler;
1664 /* Signals actually come here. */
1667 float_signal (signo)
1668 /* If this is missing, some compilers complain. */
1669 int signo ATTRIBUTE_UNUSED;
1671 if (float_handled == 0)
1672 crash_signal (signo);
1675 /* On System-V derived systems, we must reinstall the signal handler.
1676 This is harmless on BSD-derived systems. */
1677 signal (SIGFPE, float_signal);
1678 longjmp (float_handler, 1);
1681 /* Specify where to longjmp to when a floating arithmetic error happens.
1682 If HANDLER is 0, it means don't handle the errors any more. */
1685 set_float_handler (handler)
1688 float_handled = (handler != 0);
1690 memcpy (float_handler, handler, sizeof (float_handler));
1692 if (float_handled && ! float_handler_set)
1694 signal (SIGFPE, float_signal);
1695 float_handler_set = 1;
1699 /* This is a wrapper function for code which might elicit an
1700 arithmetic exception. That code should be passed in as a function
1701 pointer FN, and one argument DATA. DATA is usually a struct which
1702 contains the real input and output for function FN. This function
1703 returns 0 (failure) if longjmp was called (i.e. an exception
1704 occured.) It returns 1 (success) otherwise. */
1707 do_float_handler (fn, data)
1708 void (*fn) PARAMS ((PTR));
1715 /* We got here via longjmp () caused by an exception in function
1717 set_float_handler (NULL);
1721 set_float_handler (buf);
1723 set_float_handler (NULL);
1727 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1728 into ICE messages, which is much more user friendly. */
1731 crash_signal (signo)
1734 internal_error ("Internal error: %s", strsignal (signo));
1737 /* Strip off a legitimate source ending from the input string NAME of
1738 length LEN. Rather than having to know the names used by all of
1739 our front ends, we strip off an ending of a period followed by
1740 up to five characters. (Java uses ".class".) */
1743 strip_off_ending (name, len)
1748 for (i = 2; i < 6 && len > i; i++)
1750 if (name[len - i] == '.')
1752 name[len - i] = '\0';
1758 /* Output a quoted string. */
1761 output_quoted_string (asm_file, string)
1765 #ifdef OUTPUT_QUOTED_STRING
1766 OUTPUT_QUOTED_STRING (asm_file, string);
1770 putc ('\"', asm_file);
1771 while ((c = *string++) != 0)
1773 if (c == '\"' || c == '\\')
1774 putc ('\\', asm_file);
1777 putc ('\"', asm_file);
1781 /* Output a file name in the form wanted by System V. */
1784 output_file_directive (asm_file, input_name)
1786 const char *input_name;
1788 int len = strlen (input_name);
1789 const char *na = input_name + len;
1791 /* NA gets INPUT_NAME sans directory names. */
1792 while (na > input_name)
1794 if (IS_DIR_SEPARATOR (na[-1]))
1799 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1800 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1802 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1803 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1805 fprintf (asm_file, "\t.file\t");
1806 output_quoted_string (asm_file, na);
1807 fputc ('\n', asm_file);
1812 /* Routine to open a dump file. Return true if the dump file is enabled. */
1815 open_dump_file (index, decl)
1816 enum dump_file_index index;
1820 const char *open_arg;
1823 if (! dump_file[index].enabled)
1826 timevar_push (TV_DUMP);
1827 if (rtl_dump_file != NULL)
1828 fclose (rtl_dump_file);
1830 sprintf (seq, ".%02d.", index);
1832 if (! dump_file[index].initialized)
1834 /* If we've not initialized the files, do so now. */
1835 if (graph_dump_format != no_graph
1836 && dump_file[index].graph_dump_p)
1838 dump_name = concat (seq, dump_file[index].extension, NULL);
1839 clean_graph_dump_file (dump_base_name, dump_name);
1842 dump_file[index].initialized = 1;
1848 dump_name = concat (dump_base_name, seq,
1849 dump_file[index].extension, NULL);
1851 rtl_dump_file = fopen (dump_name, open_arg);
1852 if (rtl_dump_file == NULL)
1853 fatal_io_error ("can't open %s", dump_name);
1858 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1859 decl_printable_name (decl, 2));
1861 timevar_pop (TV_DUMP);
1865 /* Routine to close a dump file. */
1868 close_dump_file (index, func, insns)
1869 enum dump_file_index index;
1870 void (*func) PARAMS ((FILE *, rtx));
1873 if (! rtl_dump_file)
1876 timevar_push (TV_DUMP);
1878 && graph_dump_format != no_graph
1879 && dump_file[index].graph_dump_p)
1884 sprintf (seq, ".%02d.", index);
1885 suffix = concat (seq, dump_file[index].extension, NULL);
1886 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1891 func (rtl_dump_file, insns);
1893 fflush (rtl_dump_file);
1894 fclose (rtl_dump_file);
1896 rtl_dump_file = NULL;
1897 timevar_pop (TV_DUMP);
1900 /* Do any final processing required for the declarations in VEC, of
1901 which there are LEN. We write out inline functions and variables
1902 that have been deferred until this point, but which are required.
1903 Returns non-zero if anything was put out. */
1906 wrapup_global_declarations (vec, len)
1913 int output_something = 0;
1915 for (i = 0; i < len; i++)
1919 /* We're not deferring this any longer. */
1920 DECL_DEFER_OUTPUT (decl) = 0;
1922 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1923 && incomplete_decl_finalize_hook != 0)
1924 (*incomplete_decl_finalize_hook) (decl);
1927 /* Now emit any global variables or functions that we have been
1928 putting off. We need to loop in case one of the things emitted
1929 here references another one which comes earlier in the list. */
1933 for (i = 0; i < len; i++)
1937 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1940 /* Don't write out static consts, unless we still need them.
1942 We also keep static consts if not optimizing (for debugging),
1943 unless the user specified -fno-keep-static-consts.
1944 ??? They might be better written into the debug information.
1945 This is possible when using DWARF.
1947 A language processor that wants static constants to be always
1948 written out (even if it is not used) is responsible for
1949 calling rest_of_decl_compilation itself. E.g. the C front-end
1950 calls rest_of_decl_compilation from finish_decl.
1951 One motivation for this is that is conventional in some
1952 environments to write things like:
1953 static const char rcsid[] = "... version string ...";
1954 intending to force the string to be in the executable.
1956 A language processor that would prefer to have unneeded
1957 static constants "optimized away" would just defer writing
1958 them out until here. E.g. C++ does this, because static
1959 constants are often defined in header files.
1961 ??? A tempting alternative (for both C and C++) would be
1962 to force a constant to be written if and only if it is
1963 defined in a main file, as opposed to an include file. */
1965 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1966 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1967 && !DECL_COMDAT (decl))
1969 && flag_keep_static_consts
1970 && !DECL_ARTIFICIAL (decl))
1971 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1974 rest_of_decl_compilation (decl, NULL, 1, 1);
1977 if (TREE_CODE (decl) == FUNCTION_DECL
1978 && DECL_INITIAL (decl) != 0
1979 && DECL_SAVED_INSNS (decl) != 0
1980 && (flag_keep_inline_functions
1981 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1982 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1985 output_inline_function (decl);
1990 output_something = 1;
1994 return output_something;
1997 /* Issue appropriate warnings for the global declarations in VEC (of
1998 which there are LEN). Output debugging information for them. */
2001 check_global_declarations (vec, len)
2008 for (i = 0; i < len; i++)
2012 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2013 && ! TREE_ASM_WRITTEN (decl))
2014 /* Cancel the RTL for this decl so that, if debugging info
2015 output for global variables is still to come,
2016 this one will be omitted. */
2017 SET_DECL_RTL (decl, NULL_RTX);
2019 /* Warn about any function
2020 declared static but not defined.
2021 We don't warn about variables,
2022 because many programs have static variables
2023 that exist only to get some text into the object file. */
2024 if (TREE_CODE (decl) == FUNCTION_DECL
2025 && (warn_unused_function
2026 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2027 && DECL_INITIAL (decl) == 0
2028 && DECL_EXTERNAL (decl)
2029 && ! DECL_ARTIFICIAL (decl)
2030 && ! TREE_PUBLIC (decl))
2032 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2033 pedwarn_with_decl (decl,
2034 "`%s' used but never defined");
2036 warning_with_decl (decl,
2037 "`%s' declared `static' but never defined");
2038 /* This symbol is effectively an "extern" declaration now. */
2039 TREE_PUBLIC (decl) = 1;
2040 assemble_external (decl);
2043 /* Warn about static fns or vars defined but not used,
2044 but not about inline functions or static consts
2045 since defining those in header files is normal practice. */
2046 if (((warn_unused_function
2047 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2048 || (warn_unused_variable
2049 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2050 && ! DECL_IN_SYSTEM_HEADER (decl)
2051 && ! DECL_EXTERNAL (decl)
2052 && ! TREE_PUBLIC (decl)
2053 && ! TREE_USED (decl)
2054 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2055 /* The TREE_USED bit for file-scope decls
2056 is kept in the identifier, to handle multiple
2057 external decls in different scopes. */
2058 && ! TREE_USED (DECL_NAME (decl)))
2059 warning_with_decl (decl, "`%s' defined but not used");
2061 timevar_push (TV_SYMOUT);
2062 #ifdef SDB_DEBUGGING_INFO
2063 /* The COFF linker can move initialized global vars to the end.
2064 And that can screw up the symbol ordering.
2065 By putting the symbols in that order to begin with,
2066 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2067 if (write_symbols == SDB_DEBUG && TREE_CODE (decl) == VAR_DECL
2068 && TREE_PUBLIC (decl) && DECL_INITIAL (decl)
2069 && ! DECL_EXTERNAL (decl)
2070 && DECL_RTL (decl) != 0)
2071 sdbout_symbol (decl, 0);
2073 /* Output COFF information for non-global
2074 file-scope initialized variables. */
2075 if (write_symbols == SDB_DEBUG
2076 && TREE_CODE (decl) == VAR_DECL
2077 && DECL_INITIAL (decl)
2078 && ! DECL_EXTERNAL (decl)
2079 && DECL_RTL (decl) != 0
2080 && GET_CODE (DECL_RTL (decl)) == MEM)
2081 sdbout_toplevel_data (decl);
2082 #endif /* SDB_DEBUGGING_INFO */
2083 #ifdef DWARF_DEBUGGING_INFO
2084 /* Output DWARF information for file-scope tentative data object
2085 declarations, file-scope (extern) function declarations (which
2086 had no corresponding body) and file-scope tagged type declarations
2087 and definitions which have not yet been forced out. */
2089 if (write_symbols == DWARF_DEBUG
2090 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2091 dwarfout_file_scope_decl (decl, 1);
2093 #ifdef DWARF2_DEBUGGING_INFO
2094 /* Output DWARF2 information for file-scope tentative data object
2095 declarations, file-scope (extern) function declarations (which
2096 had no corresponding body) and file-scope tagged type declarations
2097 and definitions which have not yet been forced out. */
2099 if (write_symbols == DWARF2_DEBUG
2100 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2101 dwarf2out_decl (decl);
2103 timevar_pop (TV_SYMOUT);
2107 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2108 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2109 INPUT_FILENAME and LINENO accordingly. */
2112 push_srcloc (file, line)
2116 struct file_stack *fs;
2118 if (input_file_stack)
2120 input_file_stack->name = input_filename;
2121 input_file_stack->line = lineno;
2124 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2125 fs->name = input_filename = file;
2126 fs->line = lineno = line;
2127 fs->indent_level = 0;
2128 fs->next = input_file_stack;
2129 input_file_stack = fs;
2130 input_file_stack_tick++;
2133 /* Pop the top entry off the stack of presently open source files.
2134 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2140 struct file_stack *fs;
2142 fs = input_file_stack;
2143 input_file_stack = fs->next;
2145 input_file_stack_tick++;
2146 /* The initial source file is never popped. */
2147 if (!input_file_stack)
2149 input_filename = input_file_stack->name;
2150 lineno = input_file_stack->line;
2153 /* Compile an entire file of output from cpp, named NAME.
2154 Write a file of assembly output and various debugging dumps. */
2162 int name_specified = name != 0;
2164 if (dump_base_name == 0)
2165 dump_base_name = name ? name : "gccdump";
2170 /* Start timing total execution time. */
2173 timevar_start (TV_TOTAL);
2175 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2176 because then the driver will have provided the name of a temporary
2177 file or bit bucket for us. */
2179 if (! name_specified && asm_file_name == 0)
2180 asm_out_file = stdout;
2183 if (asm_file_name == 0)
2185 int len = strlen (dump_base_name);
2186 char *dumpname = (char *) xmalloc (len + 6);
2187 memcpy (dumpname, dump_base_name, len + 1);
2188 strip_off_ending (dumpname, len);
2189 strcat (dumpname, ".s");
2190 asm_file_name = dumpname;
2192 if (!strcmp (asm_file_name, "-"))
2193 asm_out_file = stdout;
2195 asm_out_file = fopen (asm_file_name, "w");
2196 if (asm_out_file == 0)
2197 fatal_io_error ("can't open %s for writing", asm_file_name);
2200 /* Initialize data in various passes. */
2203 name = init_parse (name);
2204 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2205 || debug_info_level == DINFO_LEVEL_VERBOSE
2206 || flag_test_coverage
2207 || warn_notreached);
2210 init_decl_processing ();
2216 init_function_once ();
2217 init_stor_layout_once ();
2218 init_varasm_once ();
2219 init_EXPR_INSN_LIST_cache ();
2221 /* The following initialization functions need to generate rtl, so
2222 provide a dummy function context for them. */
2223 init_dummy_function_start ();
2226 if (flag_caller_saves)
2227 init_caller_save ();
2228 expand_dummy_function_end ();
2230 /* If auxiliary info generation is desired, open the output file.
2231 This goes in the same directory as the source file--unlike
2232 all the other output files. */
2233 if (flag_gen_aux_info)
2235 aux_info_file = fopen (aux_info_file_name, "w");
2236 if (aux_info_file == 0)
2237 fatal_io_error ("can't open %s", aux_info_file_name);
2240 #ifdef IO_BUFFER_SIZE
2241 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
2242 _IOFBF, IO_BUFFER_SIZE);
2246 name = ggc_strdup (name);
2248 input_filename = name;
2250 /* Put an entry on the input file stack for the main input file. */
2251 push_srcloc (input_filename, 0);
2253 /* Perform language-specific initialization.
2254 This may set main_input_filename. */
2255 if (lang_hooks.init)
2256 (*lang_hooks.init) ();
2258 /* If the input doesn't start with a #line, use the input name
2259 as the official input file name. */
2260 if (main_input_filename == 0)
2261 main_input_filename = name;
2263 if (flag_syntax_only)
2265 write_symbols = NO_DEBUG;
2267 profile_block_flag = 0;
2271 #ifdef ASM_FILE_START
2272 ASM_FILE_START (asm_out_file);
2275 #ifdef ASM_COMMENT_START
2276 if (flag_verbose_asm)
2278 /* Print the list of options in effect. */
2279 print_version (asm_out_file, ASM_COMMENT_START);
2280 print_switch_values (asm_out_file, 0, MAX_LINE,
2281 ASM_COMMENT_START, " ", "\n");
2282 /* Add a blank line here so it appears in assembler output but not
2284 fprintf (asm_out_file, "\n");
2287 } /* ! flag_syntax_only */
2289 /* Set up the debug hooks based on write_symbols. Default to doing
2291 debug_hooks = &do_nothing_debug_hooks;
2292 #if defined(DBX_DEBUGGING_INFO)
2293 if (write_symbols == DBX_DEBUG)
2294 debug_hooks = &dbx_debug_hooks;
2296 #if defined(XCOFF_DEBUGGING_INFO)
2297 if (write_symbols == XCOFF_DEBUG)
2298 debug_hooks = &xcoff_debug_hooks;
2300 #ifdef SDB_DEBUGGING_INFO
2301 if (write_symbols == SDB_DEBUG)
2302 debug_hooks = &sdb_debug_hooks;
2304 #ifdef DWARF_DEBUGGING_INFO
2305 if (write_symbols == DWARF_DEBUG)
2306 debug_hooks = &dwarf_debug_hooks;
2308 #ifdef DWARF2_DEBUGGING_INFO
2309 if (write_symbols == DWARF2_DEBUG)
2310 debug_hooks = &dwarf2_debug_hooks;
2313 #ifndef ASM_OUTPUT_SECTION_NAME
2314 if (flag_function_sections)
2316 warning ("-ffunction-sections not supported for this target.");
2317 flag_function_sections = 0;
2319 if (flag_data_sections)
2321 warning ("-fdata-sections not supported for this target.");
2322 flag_data_sections = 0;
2326 if (flag_function_sections
2327 && (profile_flag || profile_block_flag))
2329 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2330 flag_function_sections = 0;
2333 #ifndef OBJECT_FORMAT_ELF
2334 if (flag_function_sections && write_symbols != NO_DEBUG)
2335 warning ("-ffunction-sections may affect debugging on some targets.");
2338 /* If dbx symbol table desired, initialize writing it
2339 and output the predefined types. */
2340 timevar_push (TV_SYMOUT);
2341 #ifdef DWARF2_UNWIND_INFO
2342 if (dwarf2out_do_frame ())
2343 dwarf2out_frame_init ();
2346 (*debug_hooks->init) (main_input_filename);
2347 timevar_pop (TV_SYMOUT);
2349 /* Initialize yet another pass. */
2351 init_final (main_input_filename);
2352 init_branch_prob (dump_base_name);
2354 timevar_push (TV_PARSE);
2356 /* Call the parser, which parses the entire file
2357 (calling rest_of_compilation for each function). */
2359 if (yyparse () != 0)
2361 if (errorcount == 0)
2362 fnotice (stderr, "Errors detected in input file (your bison.simple is out of date)\n");
2364 /* In case there were missing closebraces,
2365 get us back to the global binding level. */
2366 while (! global_bindings_p ())
2370 /* Compilation is now finished except for writing
2371 what's left of the symbol table output. */
2373 timevar_pop (TV_PARSE);
2375 if (flag_syntax_only)
2378 globals = getdecls ();
2380 /* Really define vars that have had only a tentative definition.
2381 Really output inline functions that must actually be callable
2382 and have not been output so far. */
2385 int len = list_length (globals);
2386 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2390 /* Process the decls in reverse order--earliest first.
2391 Put them into VEC from back to front, then take out from front. */
2393 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2394 vec[len - i - 1] = decl;
2396 wrapup_global_declarations (vec, len);
2398 /* This must occur after the loop to output deferred functions. Else
2399 the profiler initializer would not be emitted if all the functions
2400 in this compilation unit were deferred.
2402 output_func_start_profiler can not cause any additional functions or
2403 data to need to be output, so it need not be in the deferred function
2405 output_func_start_profiler ();
2407 check_global_declarations (vec, len);
2413 /* Write out any pending weak symbol declarations. */
2417 /* Do dbx symbols. */
2418 timevar_push (TV_SYMOUT);
2420 #ifdef DWARF2_UNWIND_INFO
2421 if (dwarf2out_do_frame ())
2422 dwarf2out_frame_finish ();
2425 (*debug_hooks->finish) (main_input_filename);
2426 timevar_pop (TV_SYMOUT);
2428 /* Output some stuff at end of file if nec. */
2430 dw2_output_indirect_constants ();
2432 end_final (dump_base_name);
2434 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2436 timevar_push (TV_DUMP);
2437 open_dump_file (DFI_bp, NULL);
2441 close_dump_file (DFI_bp, NULL, NULL_RTX);
2442 timevar_pop (TV_DUMP);
2446 ASM_FILE_END (asm_out_file);
2449 /* Attach a special .ident directive to the end of the file to identify
2450 the version of GCC which compiled this code. The format of the .ident
2451 string is patterned after the ones produced by native SVR4 compilers. */
2454 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2455 IDENT_ASM_OP, version_string);
2458 /* Language-specific end of compilation actions. */
2460 if (lang_hooks.finish)
2461 (*lang_hooks.finish) ();
2463 /* Close the dump files. */
2465 if (flag_gen_aux_info)
2467 fclose (aux_info_file);
2469 unlink (aux_info_file_name);
2472 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2474 timevar_push (TV_DUMP);
2475 dump_combine_total_stats (rtl_dump_file);
2476 close_dump_file (DFI_combine, NULL, NULL_RTX);
2477 timevar_pop (TV_DUMP);
2480 /* Close non-debugging input and output files. Take special care to note
2481 whether fclose returns an error, since the pages might still be on the
2482 buffer chain while the file is open. */
2486 if (ferror (asm_out_file) != 0)
2487 fatal_io_error ("error writing to %s", asm_file_name);
2488 if (fclose (asm_out_file) != 0)
2489 fatal_io_error ("error closing %s", asm_file_name);
2491 /* Do whatever is necessary to finish printing the graphs. */
2492 if (graph_dump_format != no_graph)
2496 for (i = 0; i < (int) DFI_MAX; ++i)
2497 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
2502 sprintf (seq, ".%02d.", i);
2503 suffix = concat (seq, dump_file[i].extension, NULL);
2504 finish_graph_dump_file (dump_base_name, suffix);
2511 ggc_print_statistics ();
2512 stringpool_statistics ();
2515 /* Free up memory for the benefit of leak detectors. */
2518 /* Stop timing total execution time. */
2519 timevar_stop (TV_TOTAL);
2521 /* Print the times. */
2523 timevar_print (stderr);
2526 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2527 and TYPE_DECL nodes.
2529 This does nothing for local (non-static) variables, unless the
2530 variable is a register variable with an ASMSPEC. In that case, or
2531 if the variable is not an automatic, it sets up the RTL and
2532 outputs any assembler code (label definition, storage allocation
2533 and initialization).
2535 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2536 the assembler symbol name to be used. TOP_LEVEL is nonzero
2537 if this declaration is not within a function. */
2540 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2542 const char *asmspec;
2546 /* Declarations of variables, and of functions defined elsewhere. */
2548 /* The most obvious approach, to put an #ifndef around where
2549 this macro is used, doesn't work since it's inside a macro call. */
2550 #ifndef ASM_FINISH_DECLARE_OBJECT
2551 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2554 /* Forward declarations for nested functions are not "external",
2555 but we need to treat them as if they were. */
2556 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2557 || TREE_CODE (decl) == FUNCTION_DECL)
2559 timevar_push (TV_VARCONST);
2561 make_decl_rtl (decl, asmspec);
2562 /* Don't output anything
2563 when a tentative file-scope definition is seen.
2564 But at end of compilation, do output code for them. */
2565 if (at_end || !DECL_DEFER_OUTPUT (decl))
2566 assemble_variable (decl, top_level, at_end, 0);
2567 if (decl == last_assemble_variable_decl)
2569 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2572 timevar_pop (TV_VARCONST);
2574 else if (DECL_REGISTER (decl) && asmspec != 0)
2576 if (decode_reg_name (asmspec) >= 0)
2578 SET_DECL_RTL (decl, NULL_RTX);
2579 make_decl_rtl (decl, asmspec);
2583 error ("invalid register name `%s' for register variable", asmspec);
2584 DECL_REGISTER (decl) = 0;
2589 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2590 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2591 && TREE_CODE (decl) == TYPE_DECL)
2593 timevar_push (TV_SYMOUT);
2594 dbxout_symbol (decl, 0);
2595 timevar_pop (TV_SYMOUT);
2598 #ifdef SDB_DEBUGGING_INFO
2599 else if (write_symbols == SDB_DEBUG && top_level
2600 && TREE_CODE (decl) == TYPE_DECL)
2602 timevar_push (TV_SYMOUT);
2603 sdbout_symbol (decl, 0);
2604 timevar_pop (TV_SYMOUT);
2609 /* Called after finishing a record, union or enumeral type. */
2612 rest_of_type_compilation (type, toplev)
2613 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2617 tree type ATTRIBUTE_UNUSED;
2618 int toplev ATTRIBUTE_UNUSED;
2621 timevar_push (TV_SYMOUT);
2622 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2623 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2624 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2626 #ifdef SDB_DEBUGGING_INFO
2627 if (write_symbols == SDB_DEBUG)
2628 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2630 #ifdef DWARF2_DEBUGGING_INFO
2631 if (write_symbols == DWARF2_DEBUG && toplev)
2632 dwarf2out_decl (TYPE_STUB_DECL (type));
2634 timevar_pop (TV_SYMOUT);
2637 /* DECL is an inline function, whose body is present, but which is not
2638 being output at this point. (We're putting that off until we need
2639 to do it.) If there are any actions that need to take place,
2640 including the emission of debugging information for the function,
2641 this is where they should go. This function may be called by
2642 language-dependent code for front-ends that do not even generate
2643 RTL for functions that don't need to be put out. */
2646 note_deferral_of_defined_inline_function (decl)
2647 tree decl ATTRIBUTE_UNUSED;
2649 #ifdef DWARF_DEBUGGING_INFO
2650 /* Generate the DWARF info for the "abstract" instance of a function
2651 which we may later generate inlined and/or out-of-line instances
2653 if (write_symbols == DWARF_DEBUG
2654 && (DECL_INLINE (decl) || DECL_ABSTRACT (decl))
2655 && ! DECL_ABSTRACT_ORIGIN (decl))
2657 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2658 DWARF code expects it to be set in this case. Intuitively,
2659 DECL is the function we just finished defining, so setting
2660 CURRENT_FUNCTION_DECL is sensible. */
2661 tree saved_cfd = current_function_decl;
2662 int was_abstract = DECL_ABSTRACT (decl);
2663 current_function_decl = decl;
2665 /* Let the DWARF code do its work. */
2666 set_decl_abstract_flags (decl, 1);
2667 dwarfout_file_scope_decl (decl, 0);
2669 set_decl_abstract_flags (decl, 0);
2671 /* Reset CURRENT_FUNCTION_DECL. */
2672 current_function_decl = saved_cfd;
2677 /* FNDECL is an inline function which is about to be emitted out of line.
2678 Do any preparation, such as emitting abstract debug info for the inline
2679 before it gets mangled by optimization. */
2682 note_outlining_of_inline_function (fndecl)
2683 tree fndecl ATTRIBUTE_UNUSED;
2685 #ifdef DWARF2_DEBUGGING_INFO
2686 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2687 the abstract description of inline functions until something tries to
2688 reference them. Force it out now, before optimizations mangle the
2690 if (write_symbols == DWARF2_DEBUG)
2691 dwarf2out_abstract_function (fndecl);
2695 /* This is called from finish_function (within yyparse)
2696 after each top-level definition is parsed.
2697 It is supposed to compile that function or variable
2698 and output the assembler code for it.
2699 After we return, the tree storage is freed. */
2702 rest_of_compilation (decl)
2708 int rebuild_label_notes_after_reload;
2709 int register_life_up_to_date;
2711 timevar_push (TV_REST_OF_COMPILATION);
2713 /* Now that we're out of the frontend, we shouldn't have any more
2714 CONCATs anywhere. */
2715 generating_concat_p = 0;
2717 /* When processing delayed functions, prepare_function_start() won't
2718 have been run to re-initialize it. */
2719 cse_not_expected = ! optimize;
2721 /* First, make sure that NOTE_BLOCK is set correctly for each
2722 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2723 if (!cfun->x_whole_function_mode_p)
2726 /* Then remove any notes we don't need. That will make iterating
2727 over the instruction sequence faster, and allow the garbage
2728 collector to reclaim the memory used by the notes. */
2729 remove_unnecessary_notes ();
2731 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2732 tree in sensible shape. So, we just recalculate it here. */
2733 if (cfun->x_whole_function_mode_p)
2738 /* If we are reconsidering an inline function
2739 at the end of compilation, skip the stuff for making it inline. */
2741 if (DECL_SAVED_INSNS (decl) == 0)
2747 /* If this is nested inside an inlined external function, pretend
2748 it was only declared. Since we cannot inline such functions,
2749 generating code for this one is not only not necessary but will
2750 confuse some debugging output writers. */
2751 for (parent = DECL_CONTEXT (current_function_decl);
2752 parent != NULL_TREE;
2753 parent = get_containing_scope (parent))
2754 if (TREE_CODE (parent) == FUNCTION_DECL
2755 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2757 DECL_INITIAL (decl) = 0;
2758 goto exit_rest_of_compilation;
2761 /* If requested, consider whether to make this function inline. */
2762 if ((DECL_INLINE (decl) && !flag_no_inline)
2763 || flag_inline_functions)
2765 timevar_push (TV_INTEGRATION);
2766 lose = function_cannot_inline_p (decl);
2767 timevar_pop (TV_INTEGRATION);
2768 if (lose || ! optimize)
2770 if (warn_inline && DECL_INLINE (decl))
2771 warning_with_decl (decl, lose);
2772 DECL_ABSTRACT_ORIGIN (decl) = 0;
2773 /* Don't really compile an extern inline function.
2774 If we can't make it inline, pretend
2775 it was only declared. */
2776 if (DECL_EXTERNAL (decl))
2778 DECL_INITIAL (decl) = 0;
2779 goto exit_rest_of_compilation;
2783 /* ??? Note that this has the effect of making it look
2784 like "inline" was specified for a function if we choose
2785 to inline it. This isn't quite right, but it's
2786 probably not worth the trouble to fix. */
2787 inlinable = DECL_INLINE (decl) = 1;
2790 insns = get_insns ();
2792 /* Dump the rtl code if we are dumping rtl. */
2794 if (open_dump_file (DFI_rtl, decl))
2796 if (DECL_SAVED_INSNS (decl))
2797 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2798 close_dump_file (DFI_rtl, print_rtl, insns);
2801 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2802 sorts of eh initialization. Delay this until after the
2803 initial rtl dump so that we can see the original nesting. */
2804 convert_from_eh_region_ranges ();
2806 /* If function is inline, and we don't yet know whether to
2807 compile it by itself, defer decision till end of compilation.
2808 finish_compilation will call rest_of_compilation again
2809 for those functions that need to be output. Also defer those
2810 functions that we are supposed to defer. */
2813 || (DECL_INLINE (decl)
2814 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2815 && ! flag_keep_inline_functions)
2816 || DECL_EXTERNAL (decl))))
2817 DECL_DEFER_OUTPUT (decl) = 1;
2819 if (DECL_INLINE (decl))
2820 /* DWARF wants seperate debugging info for abstract and
2821 concrete instances of all inline functions, including those
2822 declared inline but not inlined, and those inlined even
2823 though they weren't declared inline. Conveniently, that's
2824 what DECL_INLINE means at this point. */
2825 note_deferral_of_defined_inline_function (decl);
2827 if (DECL_DEFER_OUTPUT (decl))
2829 /* If -Wreturn-type, we have to do a bit of compilation. We just
2830 want to call cleanup the cfg to figure out whether or not we can
2831 fall off the end of the function; we do the minimum amount of
2832 work necessary to make that safe. */
2833 if (warn_return_type)
2835 int saved_optimize = optimize;
2838 rebuild_jump_labels (insns);
2839 find_exception_handler_labels ();
2840 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2841 cleanup_cfg (CLEANUP_PRE_SIBCALL);
2842 optimize = saved_optimize;
2845 current_function_nothrow = nothrow_function_p ();
2846 if (current_function_nothrow)
2847 /* Now we know that this can't throw; set the flag for the benefit
2848 of other functions later in this translation unit. */
2849 TREE_NOTHROW (current_function_decl) = 1;
2851 timevar_push (TV_INTEGRATION);
2852 save_for_inline (decl);
2853 timevar_pop (TV_INTEGRATION);
2854 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2855 goto exit_rest_of_compilation;
2858 /* If specified extern inline but we aren't inlining it, we are
2859 done. This goes for anything that gets here with DECL_EXTERNAL
2860 set, not just things with DECL_INLINE. */
2861 if (DECL_EXTERNAL (decl))
2862 goto exit_rest_of_compilation;
2867 /* Initialize some variables used by the optimizers. */
2868 init_function_for_compilation ();
2870 if (! DECL_DEFER_OUTPUT (decl))
2871 TREE_ASM_WRITTEN (decl) = 1;
2873 /* Now that integrate will no longer see our rtl, we need not
2874 distinguish between the return value of this function and the
2875 return value of called functions. Also, we can remove all SETs
2876 of subregs of hard registers; they are only here because of
2877 integrate. Also, we can now initialize pseudos intended to
2878 carry magic hard reg data throughout the function. */
2879 rtx_equal_function_value_matters = 0;
2880 purge_hard_subreg_sets (get_insns ());
2881 emit_initial_value_sets ();
2883 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2884 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2885 goto exit_rest_of_compilation;
2887 /* We may have potential sibling or tail recursion sites. Select one
2888 (of possibly multiple) methods of performing the call. */
2889 if (flag_optimize_sibling_calls)
2891 timevar_push (TV_JUMP);
2892 open_dump_file (DFI_sibling, decl);
2894 optimize_sibling_and_tail_recursive_calls ();
2896 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2897 timevar_pop (TV_JUMP);
2900 /* Complete generation of exception handling code. */
2901 find_exception_handler_labels ();
2904 timevar_push (TV_JUMP);
2905 open_dump_file (DFI_eh, decl);
2907 finish_eh_generation ();
2909 close_dump_file (DFI_eh, print_rtl, get_insns ());
2910 timevar_pop (TV_JUMP);
2914 /* If we are doing position-independent code generation, now
2915 is the time to output special prologues and epilogues.
2916 We do not want to do this earlier, because it just clutters
2917 up inline functions with meaningless insns. */
2922 insns = get_insns ();
2924 /* Copy any shared structure that should not be shared. */
2925 unshare_all_rtl (current_function_decl, insns);
2927 #ifdef SETJMP_VIA_SAVE_AREA
2928 /* This must be performed before virutal register instantiation. */
2929 if (current_function_calls_alloca)
2930 optimize_save_area_alloca (insns);
2933 /* Instantiate all virtual registers. */
2934 instantiate_virtual_regs (current_function_decl, insns);
2936 open_dump_file (DFI_jump, decl);
2938 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2939 are initialized and to compute whether control can drop off the end
2942 timevar_push (TV_JUMP);
2943 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2944 before jump optimization switches branch directions. */
2945 expected_value_to_br_prob ();
2947 reg_scan (insns, max_reg_num (), 0);
2948 jump_optimize (insns, !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN);
2950 timevar_pop (TV_JUMP);
2952 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2953 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2955 close_dump_file (DFI_jump, print_rtl, insns);
2956 goto exit_rest_of_compilation;
2959 /* Long term, this should probably move before the jump optimizer too,
2960 but I didn't want to disturb the rtl_dump_and_exit and related
2961 stuff at this time. */
2962 if (optimize > 0 && flag_ssa)
2964 /* Convert to SSA form. */
2966 timevar_push (TV_TO_SSA);
2967 open_dump_file (DFI_ssa, decl);
2969 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2970 cleanup_cfg (CLEANUP_EXPENSIVE);
2973 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2974 timevar_pop (TV_TO_SSA);
2976 /* Perform sparse conditional constant propagation, if requested. */
2979 timevar_push (TV_SSA_CCP);
2980 open_dump_file (DFI_ssa_ccp, decl);
2984 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2985 timevar_pop (TV_SSA_CCP);
2988 /* It would be useful to cleanup the CFG at this point, but block
2989 merging and possibly other transformations might leave a PHI
2990 node in the middle of a basic block, which is a strict no-no. */
2992 /* The SSA implementation uses basic block numbers in its phi
2993 nodes. Thus, changing the control-flow graph or the basic
2994 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2995 may cause problems. */
2999 /* Remove dead code. */
3001 timevar_push (TV_SSA_DCE);
3002 open_dump_file (DFI_ssa_dce, decl);
3004 insns = get_insns ();
3005 ssa_eliminate_dead_code();
3007 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
3008 timevar_pop (TV_SSA_DCE);
3011 /* Convert from SSA form. */
3013 timevar_push (TV_FROM_SSA);
3014 open_dump_file (DFI_ussa, decl);
3016 convert_from_ssa ();
3017 /* New registers have been created. Rescan their usage. */
3018 reg_scan (insns, max_reg_num (), 1);
3019 /* Life analysis used in SSA adds log_links but these
3020 shouldn't be there until the flow stage, so clear
3022 clear_log_links (insns);
3024 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
3025 timevar_pop (TV_FROM_SSA);
3030 timevar_push (TV_JUMP);
3034 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3035 cleanup_cfg (CLEANUP_EXPENSIVE);
3037 /* ??? Run if-conversion before delete_null_pointer_checks,
3038 since the later does not preserve the CFG. This should
3039 be changed -- no since converting if's that are going to
3041 timevar_push (TV_IFCVT);
3043 timevar_pop (TV_IFCVT);
3045 /* Try to identify useless null pointer tests and delete them. */
3046 if (flag_delete_null_pointer_checks)
3047 delete_null_pointer_checks (insns);
3050 /* Jump optimization, and the removal of NULL pointer checks, may
3051 have reduced the number of instructions substantially. CSE, and
3052 future passes, allocate arrays whose dimensions involve the
3053 maximum instruction UID, so if we can reduce the maximum UID
3054 we'll save big on memory. */
3055 renumber_insns (rtl_dump_file);
3056 timevar_pop (TV_JUMP);
3058 close_dump_file (DFI_jump, print_rtl, insns);
3062 /* Perform common subexpression elimination.
3063 Nonzero value from `cse_main' means that jumps were simplified
3064 and some code may now be unreachable, so do
3065 jump optimization again. */
3069 open_dump_file (DFI_cse, decl);
3070 timevar_push (TV_CSE);
3072 reg_scan (insns, max_reg_num (), 1);
3074 if (flag_thread_jumps)
3076 timevar_push (TV_JUMP);
3077 thread_jumps (insns, max_reg_num (), 1);
3078 timevar_pop (TV_JUMP);
3081 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3083 /* If we are not running more CSE passes, then we are no longer
3084 expecting CSE to be run. But always rerun it in a cheap mode. */
3085 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
3087 if (tem || optimize > 1)
3089 timevar_push (TV_JUMP);
3090 jump_optimize (insns, !JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3091 timevar_pop (TV_JUMP);
3094 /* Run this after jump optmizations remove all the unreachable code
3095 so that unreachable code will not keep values live. */
3096 delete_trivially_dead_insns (insns, max_reg_num (), 0);
3098 /* Try to identify useless null pointer tests and delete them. */
3099 if (flag_delete_null_pointer_checks)
3101 timevar_push (TV_JUMP);
3102 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3104 cleanup_cfg (CLEANUP_EXPENSIVE);
3106 delete_null_pointer_checks (insns);
3107 timevar_pop (TV_JUMP);
3110 /* The second pass of jump optimization is likely to have
3111 removed a bunch more instructions. */
3112 renumber_insns (rtl_dump_file);
3114 timevar_pop (TV_CSE);
3115 close_dump_file (DFI_cse, print_rtl, insns);
3118 open_dump_file (DFI_addressof, decl);
3120 purge_addressof (insns);
3121 reg_scan (insns, max_reg_num (), 1);
3123 close_dump_file (DFI_addressof, print_rtl, insns);
3127 /* Perform global cse. */
3129 if (optimize > 0 && flag_gcse)
3131 int save_csb, save_cfj;
3134 timevar_push (TV_GCSE);
3135 open_dump_file (DFI_gcse, decl);
3137 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3138 cleanup_cfg (CLEANUP_EXPENSIVE);
3139 tem = gcse_main (insns, rtl_dump_file);
3141 save_csb = flag_cse_skip_blocks;
3142 save_cfj = flag_cse_follow_jumps;
3143 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
3145 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3147 if (flag_expensive_optimizations)
3149 timevar_push (TV_CSE);
3150 reg_scan (insns, max_reg_num (), 1);
3151 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3152 timevar_pop (TV_CSE);
3153 cse_not_expected = !flag_rerun_cse_after_loop;
3156 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3157 things up. Then possibly re-run CSE again. */
3161 timevar_push (TV_JUMP);
3162 jump_optimize (insns, !JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3163 timevar_pop (TV_JUMP);
3165 if (flag_expensive_optimizations)
3167 timevar_push (TV_CSE);
3168 reg_scan (insns, max_reg_num (), 1);
3169 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3170 timevar_pop (TV_CSE);
3174 close_dump_file (DFI_gcse, print_rtl, insns);
3175 timevar_pop (TV_GCSE);
3178 flag_cse_skip_blocks = save_csb;
3179 flag_cse_follow_jumps = save_cfj;
3182 /* Move constant computations out of loops. */
3186 timevar_push (TV_LOOP);
3187 open_dump_file (DFI_loop, decl);
3189 if (flag_rerun_loop_opt)
3191 /* We only want to perform unrolling once. */
3193 loop_optimize (insns, rtl_dump_file, 0);
3195 /* The first call to loop_optimize makes some instructions
3196 trivially dead. We delete those instructions now in the
3197 hope that doing so will make the heuristics in loop work
3198 better and possibly speed up compilation. */
3199 delete_trivially_dead_insns (insns, max_reg_num (), 0);
3201 /* The regscan pass is currently necessary as the alias
3202 analysis code depends on this information. */
3203 reg_scan (insns, max_reg_num (), 1);
3205 loop_optimize (insns, rtl_dump_file,
3206 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT);
3208 close_dump_file (DFI_loop, print_rtl, insns);
3209 timevar_pop (TV_LOOP);
3216 timevar_push (TV_CSE2);
3217 open_dump_file (DFI_cse2, decl);
3219 if (flag_rerun_cse_after_loop)
3221 /* Running another jump optimization pass before the second
3222 cse pass sometimes simplifies the RTL enough to allow
3223 the second CSE pass to do a better job. Jump_optimize can change
3224 max_reg_num so we must rerun reg_scan afterwards.
3225 ??? Rework to not call reg_scan so often. */
3226 timevar_push (TV_JUMP);
3228 /* The previous call to loop_optimize makes some instructions
3229 trivially dead. We delete those instructions now in the
3230 hope that doing so will make the heuristics in jump work
3231 better and possibly speed up compilation. */
3232 delete_trivially_dead_insns (insns, max_reg_num (), 0);
3234 reg_scan (insns, max_reg_num (), 0);
3235 jump_optimize (insns, !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN);
3237 timevar_push (TV_IFCVT);
3239 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3240 cleanup_cfg (CLEANUP_EXPENSIVE);
3243 timevar_pop(TV_IFCVT);
3245 timevar_pop (TV_JUMP);
3247 reg_scan (insns, max_reg_num (), 0);
3248 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3252 timevar_push (TV_JUMP);
3253 jump_optimize (insns, !JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3254 timevar_pop (TV_JUMP);
3258 if (flag_thread_jumps)
3260 /* This pass of jump threading straightens out code
3261 that was kinked by loop optimization. */
3262 timevar_push (TV_JUMP);
3263 reg_scan (insns, max_reg_num (), 0);
3264 thread_jumps (insns, max_reg_num (), 0);
3265 timevar_pop (TV_JUMP);
3268 close_dump_file (DFI_cse2, print_rtl, insns);
3269 timevar_pop (TV_CSE2);
3274 cse_not_expected = 1;
3278 /* Do control and data flow analysis; wrote some of the results to
3281 timevar_push (TV_FLOW);
3282 open_dump_file (DFI_cfg, decl);
3284 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3285 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3286 check_function_return_warnings ();
3288 /* It may make more sense to mark constant functions after dead code is
3289 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3290 may insert code making function non-constant, but we still must consider
3291 it as constant, otherwise -fbranch-probabilities will not read data back.
3293 life_analyzis rarely eliminates modification of external memory.
3295 mark_constant_function ();
3297 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3299 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3301 timevar_push (TV_BRANCH_PROB);
3302 open_dump_file (DFI_bp, decl);
3306 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3307 timevar_pop (TV_BRANCH_PROB);
3310 open_dump_file (DFI_life, decl);
3315 /* Discover and record the loop depth at the head of each basic
3316 block. The loop infrastructure does the real job for us. */
3317 flow_loops_find (&loops, LOOP_TREE);
3319 /* Estimate using heuristics if no profiling info is available. */
3320 if (flag_guess_branch_prob)
3321 estimate_probability (&loops);
3324 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3326 flow_loops_free (&loops);
3328 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3329 timevar_pop (TV_FLOW);
3333 if (warn_uninitialized || extra_warnings)
3335 uninitialized_vars_warning (DECL_INITIAL (decl));
3337 setjmp_args_warning ();
3340 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3344 /* If -opt, try combining insns through substitution. */
3348 int rebuild_jump_labels_after_combine = 0;
3350 timevar_push (TV_COMBINE);
3351 open_dump_file (DFI_combine, decl);
3353 rebuild_jump_labels_after_combine
3354 = combine_instructions (insns, max_reg_num ());
3356 /* Combining insns may have turned an indirect jump into a
3357 direct jump. Rebuid the JUMP_LABEL fields of jumping
3359 if (rebuild_jump_labels_after_combine)
3361 timevar_push (TV_JUMP);
3362 rebuild_jump_labels (insns);
3363 timevar_pop (TV_JUMP);
3365 timevar_push (TV_FLOW);
3366 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3367 cleanup_cfg (CLEANUP_EXPENSIVE);
3369 /* Blimey. We've got to have the CFG up to date for the call to
3370 if_convert below. However, the random deletion of blocks
3371 without updating life info can wind up with Wierd Stuff in
3372 global_live_at_end. We then run sched1, which updates things
3373 properly, discovers the wierdness and aborts. */
3374 allocate_bb_life_data ();
3375 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3376 PROP_DEATH_NOTES | PROP_KILL_DEAD_CODE
3377 | PROP_SCAN_DEAD_CODE);
3379 timevar_pop (TV_FLOW);
3382 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3383 timevar_pop (TV_COMBINE);
3388 /* Rerun if-conversion, as combine may have simplified things enough to
3389 now meet sequence length restrictions. */
3392 timevar_push (TV_IFCVT);
3393 open_dump_file (DFI_ce, decl);
3399 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3400 timevar_pop (TV_IFCVT);
3403 /* Register allocation pre-pass, to reduce number of moves
3404 necessary for two-address machines. */
3405 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3407 timevar_push (TV_REGMOVE);
3408 open_dump_file (DFI_regmove, decl);
3410 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3412 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3413 timevar_pop (TV_REGMOVE);
3418 /* Do unconditional splitting before register allocation to allow machine
3419 description to add extra information not needed previously. */
3420 split_all_insns (1);
3422 /* Any of the several passes since flow1 will have munged register
3423 lifetime data a bit. */
3424 register_life_up_to_date = 0;
3426 #ifdef OPTIMIZE_MODE_SWITCHING
3427 timevar_push (TV_GCSE);
3430 if (optimize_mode_switching (NULL))
3432 /* We did work, and so had to regenerate global life information.
3433 Take advantage of this and don't re-recompute register life
3434 information below. */
3435 register_life_up_to_date = 1;
3439 timevar_pop (TV_GCSE);
3442 timevar_push (TV_SCHED);
3444 #ifdef INSN_SCHEDULING
3446 /* Print function header into sched dump now
3447 because doing the sched analysis makes some of the dump. */
3448 if (optimize > 0 && flag_schedule_insns)
3450 open_dump_file (DFI_sched, decl);
3452 /* Do control and data sched analysis,
3453 and write some of the results to dump file. */
3455 schedule_insns (rtl_dump_file);
3457 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3459 /* Register lifetime information was updated as part of verifying
3461 register_life_up_to_date = 1;
3464 timevar_pop (TV_SCHED);
3468 /* Determine if the current function is a leaf before running reload
3469 since this can impact optimizations done by the prologue and
3470 epilogue thus changing register elimination offsets. */
3471 current_function_is_leaf = leaf_function_p ();
3473 timevar_push (TV_LOCAL_ALLOC);
3474 open_dump_file (DFI_lreg, decl);
3476 /* Allocate pseudo-regs that are used only within 1 basic block.
3478 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3479 jump optimizer after register allocation and reloading are finished. */
3481 if (! register_life_up_to_date)
3482 recompute_reg_usage (insns, ! optimize_size);
3483 regclass (insns, max_reg_num (), rtl_dump_file);
3484 rebuild_label_notes_after_reload = local_alloc ();
3486 timevar_pop (TV_LOCAL_ALLOC);
3488 if (dump_file[DFI_lreg].enabled)
3490 timevar_push (TV_DUMP);
3492 dump_flow_info (rtl_dump_file);
3493 dump_local_alloc (rtl_dump_file);
3495 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3496 timevar_pop (TV_DUMP);
3501 timevar_push (TV_GLOBAL_ALLOC);
3502 open_dump_file (DFI_greg, decl);
3504 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3505 pass fixing up any insns that are invalid. */
3508 failure = global_alloc (rtl_dump_file);
3511 build_insn_chain (insns);
3512 failure = reload (insns, 0);
3515 timevar_pop (TV_GLOBAL_ALLOC);
3517 if (dump_file[DFI_greg].enabled)
3519 timevar_push (TV_DUMP);
3521 dump_global_regs (rtl_dump_file);
3523 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3524 timevar_pop (TV_DUMP);
3528 goto exit_rest_of_compilation;
3532 open_dump_file (DFI_postreload, decl);
3534 /* Do a very simple CSE pass over just the hard registers. */
3537 timevar_push (TV_RELOAD_CSE_REGS);
3538 reload_cse_regs (insns);
3539 timevar_pop (TV_RELOAD_CSE_REGS);
3542 /* If optimizing, then go ahead and split insns now since we are about
3543 to recompute flow information anyway. */
3546 int old_labelnum = max_label_num ();
3548 split_all_insns (0);
3549 rebuild_label_notes_after_reload |= old_labelnum != max_label_num ();
3552 /* Register allocation and reloading may have turned an indirect jump into
3553 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3554 jumping instructions. */
3555 if (rebuild_label_notes_after_reload)
3557 timevar_push (TV_JUMP);
3559 rebuild_jump_labels (insns);
3561 timevar_pop (TV_JUMP);
3564 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3566 /* Re-create the death notes which were deleted during reload. */
3567 timevar_push (TV_FLOW2);
3568 open_dump_file (DFI_flow2, decl);
3570 jump_optimize (insns, JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3571 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3573 /* On some machines, the prologue and epilogue code, or parts thereof,
3574 can be represented as RTL. Doing so lets us schedule insns between
3575 it and the rest of the code and also allows delayed branch
3576 scheduling to operate in the epilogue. */
3577 thread_prologue_and_epilogue_insns (insns);
3581 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3582 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3584 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3585 even for machines with possibly nonzero RETURN_POPS_ARGS
3586 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3587 push instructions will have popping returns. */
3588 #ifndef PUSH_ROUNDING
3589 if (!ACCUMULATE_OUTGOING_ARGS)
3591 combine_stack_adjustments ();
3596 flow2_completed = 1;
3598 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3599 timevar_pop (TV_FLOW2);
3601 #ifdef HAVE_peephole2
3602 if (optimize > 0 && flag_peephole2)
3604 timevar_push (TV_PEEPHOLE2);
3605 open_dump_file (DFI_peephole2, decl);
3607 peephole2_optimize (rtl_dump_file);
3609 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3610 timevar_pop (TV_PEEPHOLE2);
3614 if (optimize > 0 && flag_rename_registers)
3616 timevar_push (TV_RENAME_REGISTERS);
3617 open_dump_file (DFI_rnreg, decl);
3619 regrename_optimize ();
3621 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3622 timevar_pop (TV_RENAME_REGISTERS);
3627 timevar_push (TV_IFCVT2);
3628 open_dump_file (DFI_ce2, decl);
3632 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3633 timevar_pop (TV_IFCVT2);
3637 split_all_insns (1);
3640 #ifdef INSN_SCHEDULING
3641 if (optimize > 0 && flag_schedule_insns_after_reload)
3643 timevar_push (TV_SCHED2);
3644 open_dump_file (DFI_sched2, decl);
3646 /* Do control and data sched analysis again,
3647 and write some more of the results to dump file. */
3649 split_all_insns (1);
3651 schedule_insns (rtl_dump_file);
3653 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3654 timevar_pop (TV_SCHED2);
3660 #ifdef LEAF_REGISTERS
3661 current_function_uses_only_leaf_regs
3662 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3666 timevar_push (TV_REG_STACK);
3667 open_dump_file (DFI_stack, decl);
3669 reg_to_stack (insns, rtl_dump_file);
3671 close_dump_file (DFI_stack, print_rtl, insns);
3672 timevar_pop (TV_REG_STACK);
3678 timevar_push (TV_REORDER_BLOCKS);
3679 open_dump_file (DFI_bbro, decl);
3681 /* Last attempt to optimize CFG, as life analyzis possibly removed
3682 some instructions. */
3683 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3684 | CLEANUP_CROSSJUMP);
3685 if (flag_reorder_blocks)
3687 reorder_basic_blocks ();
3688 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3691 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3692 timevar_pop (TV_REORDER_BLOCKS);
3695 /* If a machine dependent reorganization is needed, call it. */
3696 #ifdef MACHINE_DEPENDENT_REORG
3697 open_dump_file (DFI_mach, decl);
3699 MACHINE_DEPENDENT_REORG (insns);
3701 close_dump_file (DFI_mach, print_rtl, insns);
3706 /* CFG no longer kept up to date. */
3708 /* If a scheduling pass for delayed branches is to be done,
3709 call the scheduling code. */
3712 if (optimize > 0 && flag_delayed_branch)
3714 timevar_push (TV_DBR_SCHED);
3715 open_dump_file (DFI_dbr, decl);
3717 dbr_schedule (insns, rtl_dump_file);
3719 close_dump_file (DFI_dbr, print_rtl, insns);
3720 timevar_pop (TV_DBR_SCHED);
3726 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3727 timevar_push (TV_SHORTEN_BRANCH);
3728 split_all_insns (0);
3729 timevar_pop (TV_SHORTEN_BRANCH);
3732 convert_to_eh_region_ranges ();
3734 /* Shorten branches. */
3735 timevar_push (TV_SHORTEN_BRANCH);
3736 shorten_branches (get_insns ());
3737 timevar_pop (TV_SHORTEN_BRANCH);
3739 current_function_nothrow = nothrow_function_p ();
3740 if (current_function_nothrow)
3741 /* Now we know that this can't throw; set the flag for the benefit
3742 of other functions later in this translation unit. */
3743 TREE_NOTHROW (current_function_decl) = 1;
3745 /* Now turn the rtl into assembler code. */
3747 timevar_push (TV_FINAL);
3752 /* Get the function's name, as described by its RTL. This may be
3753 different from the DECL_NAME name used in the source file. */
3755 x = DECL_RTL (decl);
3756 if (GET_CODE (x) != MEM)
3759 if (GET_CODE (x) != SYMBOL_REF)
3761 fnname = XSTR (x, 0);
3763 assemble_start_function (decl, fnname);
3764 final_start_function (insns, asm_out_file, optimize);
3765 final (insns, asm_out_file, optimize, 0);
3766 final_end_function ();
3768 #ifdef IA64_UNWIND_INFO
3769 /* ??? The IA-64 ".handlerdata" directive must be issued before
3770 the ".endp" directive that closes the procedure descriptor. */
3771 output_function_exception_table ();
3774 assemble_end_function (decl, fnname);
3776 #ifndef IA64_UNWIND_INFO
3777 /* Otherwise, it feels unclean to switch sections in the middle. */
3778 output_function_exception_table ();
3782 fflush (asm_out_file);
3784 /* Release all memory allocated by flow. */
3785 free_basic_block_vars (0);
3787 /* Release all memory held by regsets now. */
3788 regset_release_memory ();
3790 timevar_pop (TV_FINAL);
3794 /* Write DBX symbols if requested. */
3796 /* Note that for those inline functions where we don't initially
3797 know for certain that we will be generating an out-of-line copy,
3798 the first invocation of this routine (rest_of_compilation) will
3799 skip over this code by doing a `goto exit_rest_of_compilation;'.
3800 Later on, finish_compilation will call rest_of_compilation again
3801 for those inline functions that need to have out-of-line copies
3802 generated. During that call, we *will* be routed past here. */
3804 timevar_push (TV_SYMOUT);
3805 #ifdef DBX_DEBUGGING_INFO
3806 if (write_symbols == DBX_DEBUG)
3807 dbxout_function (decl);
3810 #ifdef DWARF_DEBUGGING_INFO
3811 if (write_symbols == DWARF_DEBUG)
3812 dwarfout_file_scope_decl (decl, 0);
3815 #ifdef DWARF2_DEBUGGING_INFO
3816 if (write_symbols == DWARF2_DEBUG)
3817 dwarf2out_decl (decl);
3819 timevar_pop (TV_SYMOUT);
3821 exit_rest_of_compilation:
3823 /* In case the function was not output,
3824 don't leave any temporary anonymous types
3825 queued up for sdb output. */
3826 #ifdef SDB_DEBUGGING_INFO
3827 if (write_symbols == SDB_DEBUG)
3828 sdbout_types (NULL_TREE);
3831 reload_completed = 0;
3832 flow2_completed = 0;
3835 timevar_push (TV_FINAL);
3837 /* Clear out the insn_length contents now that they are no
3839 init_insn_lengths ();
3841 /* Clear out the real_constant_chain before some of the rtx's
3842 it runs through become garbage. */
3843 clear_const_double_mem ();
3845 /* Show no temporary slots allocated. */
3848 free_basic_block_vars (0);
3850 timevar_pop (TV_FINAL);
3852 /* Make sure volatile mem refs aren't considered valid operands for
3853 arithmetic insns. We must call this here if this is a nested inline
3854 function, since the above code leaves us in the init_recog state
3855 (from final.c), and the function context push/pop code does not
3856 save/restore volatile_ok.
3858 ??? Maybe it isn't necessary for expand_start_function to call this
3859 anymore if we do it here? */
3861 init_recog_no_volatile ();
3863 /* We're done with this function. Free up memory if we can. */
3864 free_after_parsing (cfun);
3865 if (! DECL_DEFER_OUTPUT (decl))
3866 free_after_compilation (cfun);
3871 timevar_pop (TV_REST_OF_COMPILATION);
3881 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3882 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3883 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3884 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3885 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3886 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"));
3888 for (i = ARRAY_SIZE (f_options); i--;)
3890 const char *description = f_options[i].description;
3892 if (description != NULL && * description != 0)
3893 printf (" -f%-21s %s\n",
3894 f_options[i].string, _(description));
3897 printf (_(" -O[number] Set optimisation level to [number]\n"));
3898 printf (_(" -Os Optimise for space rather than speed\n"));
3899 for (i = LAST_PARAM; i--;)
3901 const char *description = compiler_params[i].help;
3902 const int length = 21-strlen(compiler_params[i].option);
3904 if (description != NULL && * description != 0)
3905 printf (" --param %s=<value>%.*s%s\n",
3906 compiler_params[i].option,
3907 length > 0 ? length : 1, " ",
3910 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3911 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3912 printf (_(" -w Suppress warnings\n"));
3913 printf (_(" -W Enable extra warnings\n"));
3915 for (i = ARRAY_SIZE (W_options); i--;)
3917 const char *description = W_options[i].description;
3919 if (description != NULL && * description != 0)
3920 printf (" -W%-21s %s\n",
3921 W_options[i].string, _(description));
3924 printf (_(" -Wunused Enable unused warnings\n"));
3925 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3926 printf (_(" -p Enable function profiling\n"));
3927 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3928 printf (_(" -a Enable block profiling \n"));
3930 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3931 printf (_(" -ax Enable jump profiling \n"));
3933 printf (_(" -o <file> Place output into <file> \n"));
3935 -G <number> Put global and static data smaller than <number>\n\
3936 bytes into a special section (on some targets)\n"));
3938 for (i = ARRAY_SIZE (debug_args); i--;)
3940 if (debug_args[i].description != NULL)
3941 printf (" -g%-21s %s\n",
3942 debug_args[i].arg, _(debug_args[i].description));
3945 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3946 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3947 printf (_(" -version Display the compiler's version\n"));
3948 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3949 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3950 #if defined INSN_SCHEDULING
3951 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3953 printf (_(" --help Display this information\n"));
3958 /* Display descriptions of language specific options.
3959 If there is no description, note that there is an undocumented option.
3960 If the description is empty, do not display anything. (This allows
3961 options to be deliberately undocumented, for whatever reason).
3962 If the option string is missing, then this is a marker, indicating
3963 that the description string is in fact the name of a language, whose
3964 language specific options are to follow. */
3966 if (ARRAY_SIZE (documented_lang_options) > 1)
3968 printf (_("\nLanguage specific options:\n"));
3970 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3972 const char *description = documented_lang_options[i].description;
3973 const char *option = documented_lang_options[i].option;
3975 if (description == NULL)
3980 printf (_(" %-23.23s [undocumented]\n"), option);
3982 else if (*description == 0)
3984 else if (option == NULL)
3988 (_("\nThere are undocumented %s specific options as well.\n"),
3992 printf (_("\n Options for %s:\n"), description);
3997 printf (" %-23.23s %s\n", option, _(description));
4002 printf (_("\nThere are undocumented %s specific options as well.\n"),
4005 display_target_options ();
4009 display_target_options ()
4013 if (ARRAY_SIZE (target_switches) > 1
4014 #ifdef TARGET_OPTIONS
4015 || ARRAY_SIZE (target_options) > 1
4023 printf (_("\nTarget specific options:\n"));
4025 for (i = ARRAY_SIZE (target_switches); i--;)
4027 const char *option = target_switches[i].name;
4028 const char *description = target_switches[i].description;
4030 if (option == NULL || *option == 0)
4032 else if (description == NULL)
4037 printf (_(" -m%-23.23s [undocumented]\n"), option);
4039 else if (* description != 0)
4040 doc += printf (" -m%-23.23s %s\n", option, _(description));
4043 #ifdef TARGET_OPTIONS
4044 for (i = ARRAY_SIZE (target_options); i--;)
4046 const char *option = target_options[i].prefix;
4047 const char *description = target_options[i].description;
4049 if (option == NULL || *option == 0)
4051 else if (description == NULL)
4056 printf (_(" -m%-23.23s [undocumented]\n"), option);
4058 else if (* description != 0)
4059 doc += printf (" -m%-23.23s %s\n", option, _(description));
4065 printf (_("\nThere are undocumented target specific options as well.\n"));
4067 printf (_(" They exist, but they are not documented.\n"));
4072 /* Parse a -d... comand line switch. */
4075 decode_d_option (arg)
4084 for (i = 0; i < (int) DFI_MAX; ++i)
4085 dump_file[i].enabled = 1;
4091 flag_print_asm_name = 1;
4094 flag_dump_rtl_in_asm = 1;
4095 flag_print_asm_name = 1;
4098 graph_dump_format = vcg;
4101 rtl_dump_and_exit = 1;
4106 case 'D': /* These are handled by the preprocessor. */
4112 for (i = 0; i < (int) DFI_MAX; ++i)
4113 if (c == dump_file[i].debug_switch)
4115 dump_file[i].enabled = 1;
4120 warning ("unrecognized gcc debugging option: %c", c);
4125 /* Parse a -f... comand line switch. ARG is the value after the -f.
4126 It is safe to access 'ARG - 2' to generate the full switch name.
4127 Return the number of strings consumed. */
4130 decode_f_option (arg)
4134 const char *option_value = NULL;
4136 /* Search for the option in the table of binary f options. */
4137 for (j = ARRAY_SIZE (f_options); j--;)
4139 if (!strcmp (arg, f_options[j].string))
4141 *f_options[j].variable = f_options[j].on_value;
4145 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4146 && ! strcmp (arg + 3, f_options[j].string))
4148 *f_options[j].variable = ! f_options[j].on_value;
4153 if (!strcmp (arg, "fast-math"))
4154 set_fast_math_flags();
4155 else if (!strcmp (arg, "no-fast-math"))
4156 set_no_fast_math_flags();
4157 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4158 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4161 read_integral_parameter (option_value, arg - 2,
4163 set_param_value ("max-inline-insns", val);
4165 #ifdef INSN_SCHEDULING
4166 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4167 fix_sched_param ("verbose", option_value);
4169 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4170 fix_register (option_value, 1, 1);
4171 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4172 fix_register (option_value, 0, 1);
4173 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4174 fix_register (option_value, 0, 0);
4175 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4176 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4177 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4179 = read_integral_parameter (option_value, arg - 2, align_functions);
4180 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4181 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4182 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4184 = read_integral_parameter (option_value, arg - 2, align_labels);
4185 else if ((option_value
4186 = skip_leading_substring (arg, "stack-limit-register=")))
4188 int reg = decode_reg_name (option_value);
4190 error ("unrecognized register name `%s'", option_value);
4192 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4194 else if ((option_value
4195 = skip_leading_substring (arg, "stack-limit-symbol=")))
4198 nm = ggc_strdup (option_value);
4199 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4201 else if ((option_value
4202 = skip_leading_substring (arg, "message-length=")))
4203 output_set_maximum_length
4204 (&global_dc->buffer, read_integral_parameter
4205 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4206 else if ((option_value
4207 = skip_leading_substring (arg, "diagnostics-show-location=")))
4209 if (!strcmp (option_value, "once"))
4210 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4211 else if (!strcmp (option_value, "every-line"))
4212 diagnostic_prefixing_rule (global_dc)
4213 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4215 error ("Unrecognized option `%s'", arg - 2);
4217 else if (!strcmp (arg, "no-stack-limit"))
4218 stack_limit_rtx = NULL_RTX;
4219 else if (!strcmp (arg, "preprocessed"))
4220 /* Recognise this switch but do nothing. This prevents warnings
4221 about an unrecognized switch if cpplib has not been linked in. */
4229 /* Parse a -W... comand line switch. ARG is the value after the -W.
4230 It is safe to access 'ARG - 2' to generate the full switch name.
4231 Return the number of strings consumed. */
4234 decode_W_option (arg)
4237 const char *option_value = NULL;
4240 /* Search for the option in the table of binary W options. */
4242 for (j = ARRAY_SIZE (W_options); j--;)
4244 if (!strcmp (arg, W_options[j].string))
4246 *W_options[j].variable = W_options[j].on_value;
4250 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4251 && ! strcmp (arg + 3, W_options[j].string))
4253 *W_options[j].variable = ! W_options[j].on_value;
4258 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4259 warning ("-Wid-clash-LEN is no longer supported");
4260 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4262 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4264 warn_larger_than = larger_than_size != -1;
4266 else if (!strcmp (arg, "unused"))
4270 else if (!strcmp (arg, "no-unused"))
4280 /* Parse a -g... comand line switch. ARG is the value after the -g.
4281 It is safe to access 'ARG - 2' to generate the full switch name.
4282 Return the number of strings consumed. */
4285 decode_g_option (arg)
4288 static unsigned level=0;
4289 /* A lot of code assumes write_symbols == NO_DEBUG if the
4290 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4291 of what debugging type has been selected). This records the
4292 selected type. It is an error to specify more than one
4294 static enum debug_info_type selected_debug_type = NO_DEBUG;
4295 /* Non-zero if debugging format has been explicitly set.
4296 -g and -ggdb don't explicitly set the debugging format so
4297 -gdwarf -g3 is equivalent to -gdwarf3. */
4298 static int type_explicitly_set_p = 0;
4299 /* Indexed by enum debug_info_type. */
4300 static const char *debug_type_names[] =
4302 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4305 /* The maximum admissible debug level value. */
4306 static const unsigned max_debug_level = 3;
4308 /* Look up ARG in the table. */
4309 for (da = debug_args; da->arg; da++)
4311 const int da_len = strlen (da->arg);
4313 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4315 enum debug_info_type type = da->debug_type;
4316 const char *p = arg + da_len;
4318 if (*p && (*p < '0' || *p > '9'))
4321 /* A debug flag without a level defaults to level 2.
4322 Note we do not want to call read_integral_parameter
4323 for that case since it will call atoi which
4326 ??? We may want to generalize the interface to
4327 read_integral_parameter to better handle this case
4328 if this case shows up often. */
4330 level = read_integral_parameter (p, 0, max_debug_level + 1);
4332 level = (level == 0) ? 2 : level;
4334 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4336 error ("use -gdwarf -g%d for DWARF v1, level %d",
4339 error ("use -gdwarf-2 for DWARF v2");
4342 if (level > max_debug_level)
4345 ignoring option `%s' due to invalid debug level specification",
4347 level = debug_info_level;
4350 if (type == NO_DEBUG)
4352 type = PREFERRED_DEBUGGING_TYPE;
4354 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4356 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4357 type = DWARF2_DEBUG;
4359 #ifdef DBX_DEBUGGING_INFO
4366 if (type == NO_DEBUG)
4367 warning ("`%s': unknown or unsupported -g option", arg - 2);
4369 /* Does it conflict with an already selected type? */
4370 if (type_explicitly_set_p
4371 /* -g/-ggdb don't conflict with anything. */
4372 && da->debug_type != NO_DEBUG
4373 && type != selected_debug_type)
4374 warning ("`%s' ignored, conflicts with `-g%s'",
4375 arg - 2, debug_type_names[(int) selected_debug_type]);
4378 /* If the format has already been set, -g/-ggdb
4379 only change the debug level. */
4380 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4381 /* Don't change debugging type. */
4385 selected_debug_type = type;
4386 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4389 write_symbols = (level == 0
4391 : selected_debug_type);
4392 use_gnu_debug_info_extensions = da->use_extensions_p;
4393 debug_info_level = (enum debug_info_level) level;
4406 /* Decode the first argument in the argv as a language-independent option.
4407 Return the number of strings consumed. */
4410 independent_decode_option (argc, argv)
4414 char *arg = argv[0];
4416 if (arg[0] != '-' || arg[1] == 0)
4428 if (!strcmp (arg, "-help"))
4431 exit_after_options = 1;
4434 if (!strcmp (arg, "-target-help"))
4436 display_target_options ();
4437 exit_after_options = 1;
4440 if (!strcmp (arg, "-version"))
4442 print_version (stderr, "");
4443 exit_after_options = 1;
4446 /* Handle '--param <name>=<value>'. */
4447 if (strcmp (arg, "-param") == 0)
4453 error ("-param option missing argument");
4457 /* Get the '<name>=<value>' parameter. */
4459 /* Look for the `='. */
4460 equal = strchr (arg, '=');
4462 error ("invalid --param option: %s", arg);
4467 /* Zero out the `=' sign so that we get two separate strings. */
4469 /* Figure out what value is specified. */
4470 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4471 if (val != INVALID_PARAM_VAL)
4472 set_param_value (arg, val);
4474 error ("invalid parameter value `%s'", equal + 1);
4489 /* Already been treated in main (). Do nothing. */
4493 set_target_switch (arg + 1);
4497 return decode_f_option (arg + 1);
4500 return decode_g_option (arg + 1);
4503 if (!strcmp (arg, "dumpbase"))
4508 dump_base_name = argv[1];
4512 decode_d_option (arg + 1);
4516 if (!strcmp (arg, "pedantic"))
4518 else if (!strcmp (arg, "pedantic-errors"))
4519 flag_pedantic_errors = pedantic = 1;
4520 else if (arg[1] == 0)
4527 if (!strcmp (arg, "quiet"))
4534 if (!strcmp (arg, "version"))
4542 inhibit_warnings = 1;
4551 /* We save the value of warn_uninitialized, since if they put
4552 -Wuninitialized on the command line, we need to generate a
4553 warning about not using it without also specifying -O. */
4554 if (warn_uninitialized != 1)
4555 warn_uninitialized = 2;
4558 return decode_W_option (arg + 1);
4564 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4565 warning ("`-a' option (basic block profile) not supported");
4567 profile_block_flag = (profile_block_flag < 2) ? 1 : 3;
4570 else if (!strcmp (arg, "ax"))
4572 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4573 warning ("`-ax' option (jump profiling) not supported");
4575 profile_block_flag = (!profile_block_flag
4576 || profile_block_flag == 2) ? 2 : 3;
4579 else if (!strncmp (arg, "aux-info", 8))
4586 aux_info_file_name = argv[1];
4587 flag_gen_aux_info = 1;
4590 else if (arg[8] == '=')
4592 aux_info_file_name = arg + 9;
4593 flag_gen_aux_info = 1;
4608 asm_file_name = argv[1];
4623 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4628 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4632 if (g_switch_val == -1)
4636 g_switch_set = TRUE;
4637 g_switch_value = g_switch_val;
4647 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4648 Decode command args, then call compile_file.
4649 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4650 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4652 It is not safe to call this function more than once. */
4655 toplev_main (argc, argv)
4662 /* save in case md file wants to emit args as a comment. */
4666 p = argv[0] + strlen (argv[0]);
4667 while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
4671 xmalloc_set_program_name (progname);
4673 /* LC_CTYPE determines the character set used by the terminal so it has be set
4674 to output messages correctly. */
4676 #ifdef HAVE_LC_MESSAGES
4677 setlocale (LC_CTYPE, "");
4678 setlocale (LC_MESSAGES, "");
4680 setlocale (LC_ALL, "");
4683 (void) bindtextdomain (PACKAGE, localedir);
4684 (void) textdomain (PACKAGE);
4686 /* Install handler for SIGFPE, which may be received while we do
4687 compile-time floating point arithmetic. */
4688 signal (SIGFPE, float_signal);
4690 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4692 signal (SIGSEGV, crash_signal);
4695 signal (SIGILL, crash_signal);
4698 signal (SIGBUS, crash_signal);
4701 signal (SIGABRT, crash_signal);
4703 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4704 signal (SIGIOT, crash_signal);
4707 decl_printable_name = decl_name;
4708 lang_expand_expr = (lang_expand_expr_t) do_abort;
4710 /* Initialize whether `char' is signed. */
4711 flag_signed_char = DEFAULT_SIGNED_CHAR;
4712 #ifdef DEFAULT_SHORT_ENUMS
4713 /* Initialize how much space enums occupy, by default. */
4714 flag_short_enums = DEFAULT_SHORT_ENUMS;
4717 /* Initialize the garbage-collector. */
4720 ggc_add_rtx_root (&stack_limit_rtx, 1);
4721 ggc_add_tree_root (¤t_function_decl, 1);
4722 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4724 /* Initialize the diagnostics reporting machinery. */
4725 diagnostic_initialize (global_dc);
4727 /* Register the language-independent parameters. */
4728 add_params (lang_independent_params, LAST_PARAM);
4730 /* Perform language-specific options intialization. */
4731 if (lang_hooks.init_options)
4732 (*lang_hooks.init_options) ();
4734 /* Scan to see what optimization level has been specified. That will
4735 determine the default value of many flags. */
4736 for (i = 1; i < argc; i++)
4738 if (!strcmp (argv[i], "-O"))
4743 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4745 /* Handle -Os, -O2, -O3, -O69, ... */
4746 char *p = &argv[i][2];
4748 if ((p[0] == 's') && (p[1] == 0))
4752 /* Optimizing for size forces optimize to be 2. */
4757 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4758 if (optimize_val != -1)
4760 optimize = optimize_val;
4770 flag_thread_jumps = 1;
4772 flag_delayed_branch = 1;
4774 #ifdef CAN_DEBUG_WITHOUT_FP
4775 flag_omit_frame_pointer = 1;
4777 flag_guess_branch_prob = 1;
4782 flag_optimize_sibling_calls = 1;
4783 flag_cse_follow_jumps = 1;
4784 flag_cse_skip_blocks = 1;
4786 flag_expensive_optimizations = 1;
4787 flag_strength_reduce = 1;
4788 flag_rerun_cse_after_loop = 1;
4789 flag_rerun_loop_opt = 1;
4790 flag_caller_saves = 1;
4793 #ifdef INSN_SCHEDULING
4794 flag_schedule_insns = 1;
4795 flag_schedule_insns_after_reload = 1;
4798 flag_strict_aliasing = 1;
4799 flag_delete_null_pointer_checks = 1;
4800 flag_reorder_blocks = 1;
4805 flag_inline_functions = 1;
4806 flag_rename_registers = 1;
4809 if (optimize < 2 || optimize_size)
4814 align_functions = 1;
4817 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4820 set_target_switch ("");
4822 /* Unwind tables are always present in an ABI-conformant IA-64
4823 object file, so the default should be ON. */
4824 #ifdef IA64_UNWIND_INFO
4825 flag_unwind_tables = IA64_UNWIND_INFO;
4828 #ifdef OPTIMIZATION_OPTIONS
4829 /* Allow default optimizations to be specified on a per-machine basis. */
4830 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4833 /* Initialize register usage now so switches may override. */
4836 /* Perform normal command line switch decoding. */
4837 for (i = 1; i < argc;)
4840 int indep_processed;
4842 /* Give the language a chance to decode the option for itself. */
4843 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4845 if (lang_processed >= 0)
4846 /* Now see if the option also has a language independent meaning.
4847 Some options are both language specific and language independent,
4849 indep_processed = independent_decode_option (argc - i, argv + i);
4852 lang_processed = -lang_processed;
4853 indep_processed = 0;
4856 if (lang_processed || indep_processed)
4857 i += MAX (lang_processed, indep_processed);
4860 const char *option = NULL;
4861 const char *lang = NULL;
4864 /* It is possible that the command line switch is not valid for the
4865 current language, but it is valid for another language. In order
4866 to be compatible with previous versions of the compiler (which
4867 did not issue an error message in this case) we check for this
4868 possibility here. If we do find a match, then if extra_warnings
4869 is set we generate a warning message, otherwise we will just
4870 ignore the option. */
4871 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4873 option = documented_lang_options[j].option;
4876 lang = documented_lang_options[j].description;
4877 else if (! strncmp (argv[i], option, strlen (option)))
4881 if (j != ARRAY_SIZE (documented_lang_options))
4885 warning ("Ignoring command line option '%s'", argv[i]);
4888 ("(It is valid for %s but not the selected language)",
4892 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4893 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4895 error ("Unrecognized option `%s'", argv[i]);
4901 /* All command line options have been processed. */
4902 if (lang_hooks.post_options)
4903 (*lang_hooks.post_options) ();
4905 if (exit_after_options)
4908 /* Checker uses the frame pointer. */
4909 if (flag_check_memory_usage)
4910 flag_omit_frame_pointer = 0;
4914 /* Inlining does not work if not optimizing,
4915 so force it not to be done. */
4919 /* The c_decode_option function and decode_option hook set
4920 this to `2' if -Wall is used, so we can avoid giving out
4921 lots of errors for people who don't realize what -Wall does. */
4922 if (warn_uninitialized == 1)
4923 warning ("-Wuninitialized is not supported without -O");
4926 /* We do not currently support sibling-call optimization in the
4927 presence of exceptions. See PR2975 for a test-case that will
4928 fail if we try to combine both of these features. */
4929 if (flag_exceptions)
4930 flag_optimize_sibling_calls = 0;
4932 #ifdef OVERRIDE_OPTIONS
4933 /* Some machines may reject certain combinations of options. */
4937 /* Set up the align_*_log variables, defaulting them to 1 if they
4938 were still unset. */
4939 if (align_loops <= 0) align_loops = 1;
4940 align_loops_log = floor_log2 (align_loops * 2 - 1);
4941 if (align_jumps <= 0) align_jumps = 1;
4942 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4943 if (align_labels <= 0) align_labels = 1;
4944 align_labels_log = floor_log2 (align_labels * 2 - 1);
4945 if (align_functions <= 0) align_functions = 1;
4946 align_functions_log = floor_log2 (align_functions * 2 - 1);
4948 if (profile_block_flag == 3)
4950 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4951 profile_block_flag = 2;
4954 /* Unrolling all loops implies that standard loop unrolling must also
4956 if (flag_unroll_all_loops)
4957 flag_unroll_loops = 1;
4958 /* Loop unrolling requires that strength_reduction be on also. Silently
4959 turn on strength reduction here if it isn't already on. Also, the loop
4960 unrolling code assumes that cse will be run after loop, so that must
4961 be turned on also. */
4962 if (flag_unroll_loops)
4964 flag_strength_reduce = 1;
4965 flag_rerun_cse_after_loop = 1;
4968 /* Warn about options that are not supported on this machine. */
4969 #ifndef INSN_SCHEDULING
4970 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4971 warning ("instruction scheduling not supported on this target machine");
4974 if (flag_delayed_branch)
4975 warning ("this target machine does not have delayed branches");
4978 /* Some operating systems do not allow profiling without a frame
4980 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4982 && flag_omit_frame_pointer)
4984 error ("profiling does not work without a frame pointer");
4985 flag_omit_frame_pointer = 0;
4988 user_label_prefix = USER_LABEL_PREFIX;
4989 if (flag_leading_underscore != -1)
4991 /* If the default prefix is more complicated than "" or "_",
4992 issue a warning and ignore this option. */
4993 if (user_label_prefix[0] == 0 ||
4994 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4996 user_label_prefix = flag_leading_underscore ? "_" : "";
4999 warning ("-f%sleading-underscore not supported on this target machine",
5000 flag_leading_underscore ? "" : "no-");
5003 /* If we are in verbose mode, write out the version and maybe all the
5004 option flags in use. */
5007 print_version (stderr, "");
5009 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5012 compile_file (filename);
5015 return (FATAL_EXIT_CODE);
5017 return (FATAL_EXIT_CODE);
5018 return (SUCCESS_EXIT_CODE);
5021 /* Decode -m switches. */
5022 /* Decode the switch -mNAME. */
5025 set_target_switch (name)
5029 int valid_target_option = 0;
5031 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5032 if (!strcmp (target_switches[j].name, name))
5034 if (target_switches[j].value < 0)
5035 target_flags &= ~-target_switches[j].value;
5037 target_flags |= target_switches[j].value;
5038 valid_target_option = 1;
5041 #ifdef TARGET_OPTIONS
5042 if (!valid_target_option)
5043 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5045 int len = strlen (target_options[j].prefix);
5046 if (!strncmp (target_options[j].prefix, name, len))
5048 *target_options[j].variable = name + len;
5049 valid_target_option = 1;
5054 if (!valid_target_option)
5055 error ("Invalid option `%s'", name);
5058 /* Print version information to FILE.
5059 Each line begins with INDENT (for the case where FILE is the
5060 assembler output file). */
5063 print_version (file, indent)
5068 #define __VERSION__ "[?]"
5072 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5074 "%s%s%s version %s (%s) compiled by CC.\n"
5076 , indent, *indent != 0 ? " " : "",
5077 language_string, version_string, TARGET_NAME,
5078 indent, __VERSION__);
5081 /* Print an option value and return the adjusted position in the line.
5082 ??? We don't handle error returns from fprintf (disk full); presumably
5083 other code will catch a disk full though. */
5086 print_single_switch (file, pos, max, indent, sep, term, type, name)
5089 const char *indent, *sep, *term, *type, *name;
5091 /* The ultrix fprintf returns 0 on success, so compute the result we want
5092 here since we need it for the following test. */
5093 int len = strlen (sep) + strlen (type) + strlen (name);
5098 fprintf (file, "%s", term);
5103 fprintf (file, "%s", indent);
5104 pos = strlen (indent);
5106 fprintf (file, "%s%s%s", sep, type, name);
5111 /* Print active target switches to FILE.
5112 POS is the current cursor position and MAX is the size of a "line".
5113 Each line begins with INDENT and ends with TERM.
5114 Each switch is separated from the next by SEP. */
5117 print_switch_values (file, pos, max, indent, sep, term)
5120 const char *indent, *sep, *term;
5125 /* Print the options as passed. */
5127 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
5128 _("options passed: "), "");
5130 for (p = &save_argv[1]; *p != NULL; p++)
5134 if (strcmp (*p, "-o") == 0)
5140 if (strcmp (*p, "-quiet") == 0)
5142 if (strcmp (*p, "-version") == 0)
5147 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
5150 fprintf (file, "%s", term);
5152 /* Print the -f and -m options that have been enabled.
5153 We don't handle language specific options but printing argv
5156 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
5157 _("options enabled: "), "");
5159 for (j = 0; j < ARRAY_SIZE (f_options); j++)
5160 if (*f_options[j].variable == f_options[j].on_value)
5161 pos = print_single_switch (file, pos, max, indent, sep, term,
5162 "-f", f_options[j].string);
5164 /* Print target specific options. */
5166 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5167 if (target_switches[j].name[0] != '\0'
5168 && target_switches[j].value > 0
5169 && ((target_switches[j].value & target_flags)
5170 == target_switches[j].value))
5172 pos = print_single_switch (file, pos, max, indent, sep, term,
5173 "-m", target_switches[j].name);
5176 #ifdef TARGET_OPTIONS
5177 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5178 if (*target_options[j].variable != NULL)
5181 sprintf (prefix, "-m%s", target_options[j].prefix);
5182 pos = print_single_switch (file, pos, max, indent, sep, term,
5183 prefix, *target_options[j].variable);
5187 fprintf (file, "%s", term);
5190 /* Returns nonzero if it is appropriate not to emit any debugging
5191 information for BLOCK, because it doesn't contain any instructions.
5192 This may not be the case for blocks containing nested functions, since
5193 we may actually call such a function even though the BLOCK information
5197 debug_ignore_block (block)
5198 tree block ATTRIBUTE_UNUSED;
5200 /* Never delete the BLOCK for the outermost scope
5201 of the function; we can refer to names from
5202 that scope even if the block notes are messed up. */
5203 if (is_body_block (block))
5206 #ifdef DWARF2_DEBUGGING_INFO
5207 if (write_symbols == DWARF2_DEBUG)
5208 return dwarf2out_ignore_block (block);