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. */
293 /* Describes all the dump files. Should be kept in order of the
294 pass and in sync with dump_file_index above.
296 Remaining -d letters:
302 struct dump_file_info dump_file[DFI_MAX] =
304 { "rtl", 'r', 0, 0, 0 },
305 { "sibling", 'i', 0, 0, 0 },
306 { "eh", 'h', 0, 0, 0 },
307 { "jump", 'j', 0, 0, 0 },
308 { "ssa", 'e', 1, 0, 0 },
309 { "ssaccp", 'W', 1, 0, 0 },
310 { "ssadce", 'X', 1, 0, 0 },
311 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "cse", 's', 0, 0, 0 },
313 { "addressof", 'F', 0, 0, 0 },
314 { "gcse", 'G', 1, 0, 0 },
315 { "loop", 'L', 1, 0, 0 },
316 { "cse2", 't', 1, 0, 0 },
317 { "cfg", 'f', 1, 0, 0 },
318 { "bp", 'b', 1, 0, 0 },
319 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
320 { "combine", 'c', 1, 0, 0 },
321 { "ce", 'C', 1, 0, 0 },
322 { "regmove", 'N', 1, 0, 0 },
323 { "sched", 'S', 1, 0, 0 },
324 { "lreg", 'l', 1, 0, 0 },
325 { "greg", 'g', 1, 0, 0 },
326 { "postreload", 'o', 1, 0, 0 },
327 { "flow2", 'w', 1, 0, 0 },
328 { "peephole2", 'z', 1, 0, 0 },
329 { "rnreg", 'n', 1, 0, 0 },
330 { "ce2", 'E', 1, 0, 0 },
331 { "sched2", 'R', 1, 0, 0 },
332 { "bbro", 'B', 1, 0, 0 },
333 { "jump2", 'J', 1, 0, 0 },
334 { "mach", 'M', 1, 0, 0 },
335 { "dbr", 'd', 0, 0, 0 },
336 { "stack", 'k', 1, 0, 0 },
339 static int open_dump_file PARAMS ((enum dump_file_index, tree));
340 static void close_dump_file PARAMS ((enum dump_file_index,
341 void (*) (FILE *, rtx), rtx));
343 /* Other flags saying which kinds of debugging dump have been requested. */
345 int rtl_dump_and_exit;
346 int flag_print_asm_name;
347 static int version_flag;
348 static char *filename;
349 enum graph_dump_types graph_dump_format;
351 /* Name for output file of assembly code, specified with -o. */
355 /* Value of the -G xx switch, and whether it was passed or not. */
359 /* Type(s) of debugging information we are producing (if any).
360 See flags.h for the definitions of the different possible
361 types of debugging information. */
362 enum debug_info_type write_symbols = NO_DEBUG;
364 /* Level of debugging information we are producing. See flags.h
365 for the definitions of the different possible levels. */
366 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
368 /* Nonzero means use GNU-only extensions in the generated symbolic
369 debugging information. */
370 /* Currently, this only has an effect when write_symbols is set to
371 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
372 int use_gnu_debug_info_extensions = 0;
374 /* Nonzero means do optimizations. -O.
375 Particular numeric values stand for particular amounts of optimization;
376 thus, -O2 stores 2 here. However, the optimizations beyond the basic
377 ones are not controlled directly by this variable. Instead, they are
378 controlled by individual `flag_...' variables that are defaulted
379 based on this variable. */
383 /* Nonzero means optimize for size. -Os.
384 The only valid values are zero and non-zero. When optimize_size is
385 non-zero, optimize defaults to 2, but certain individual code
386 bloating optimizations are disabled. */
388 int optimize_size = 0;
390 /* Nonzero if we should exit after parsing options. */
391 static int exit_after_options = 0;
393 /* The FUNCTION_DECL for the function currently being compiled,
394 or 0 if between functions. */
395 tree current_function_decl;
397 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
399 tree current_function_func_begin_label;
401 /* Pointer to function to compute the name to use to print a declaration.
402 DECL is the declaration in question.
403 VERBOSITY determines what information will be printed:
404 0: DECL_NAME, demangled as necessary.
405 1: and scope information.
406 2: and any other information that might be interesting, such as function
407 parameter types in C++. */
409 const char *(*decl_printable_name) PARAMS ((tree, int));
411 /* Pointer to function to compute rtl for a language-specific tree code. */
413 typedef rtx (*lang_expand_expr_t)
414 PARAMS ((union tree_node *, rtx, enum machine_mode,
415 enum expand_modifier modifier));
417 lang_expand_expr_t lang_expand_expr = 0;
419 tree (*lang_expand_constant) PARAMS ((tree)) = 0;
421 /* Pointer to function to finish handling an incomplete decl at the
422 end of compilation. */
424 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
426 /* Nonzero if doing dwarf2 duplicate elimination. */
428 int flag_eliminate_dwarf2_dups = 0;
430 /* Nonzero if generating code to do profiling. */
432 int profile_flag = 0;
434 /* Nonzero if generating code to do profiling on a line-by-line basis. */
436 int profile_block_flag;
438 /* Nonzero if generating code to profile program flow graph arcs. */
440 int profile_arc_flag = 0;
442 /* Nonzero if generating info for gcov to calculate line test coverage. */
444 int flag_test_coverage = 0;
446 /* Nonzero indicates that branch taken probabilities should be calculated. */
448 int flag_branch_probabilities = 0;
450 /* Nonzero if basic blocks should be reordered. */
452 int flag_reorder_blocks = 0;
454 /* Nonzero if registers should be renamed. */
456 int flag_rename_registers = 0;
458 /* Nonzero for -pedantic switch: warn about anything
459 that standard spec forbids. */
463 /* Temporarily suppress certain warnings.
464 This is set while reading code from a system header file. */
466 int in_system_header = 0;
468 /* Don't print functions as they are compiled. -quiet. */
472 /* Print times taken by the various passes. -ftime-report. */
476 /* Print memory still in use at end of compilation (which may have little
477 to do with peak memory consumption). -fmem-report. */
481 /* Non-zero means to collect statistics which might be expensive
482 and to print them when we are done. */
483 int flag_detailed_statistics = 0;
488 /* Nonzero means `char' should be signed. */
490 int flag_signed_char;
492 /* Nonzero means give an enum type only as many bytes as it needs. */
494 int flag_short_enums;
496 /* Nonzero for -fcaller-saves: allocate values in regs that need to
497 be saved across function calls, if that produces overall better code.
498 Optional now, so people can test it. */
500 #ifdef DEFAULT_CALLER_SAVES
501 int flag_caller_saves = 1;
503 int flag_caller_saves = 0;
506 /* Nonzero if structures and unions should be returned in memory.
508 This should only be defined if compatibility with another compiler or
509 with an ABI is needed, because it results in slower code. */
511 #ifndef DEFAULT_PCC_STRUCT_RETURN
512 #define DEFAULT_PCC_STRUCT_RETURN 1
515 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
517 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
519 /* Nonzero for -fforce-mem: load memory value into a register
520 before arithmetic on it. This makes better cse but slower compilation. */
522 int flag_force_mem = 0;
524 /* Nonzero for -fforce-addr: load memory address into a register before
525 reference to memory. This makes better cse but slower compilation. */
527 int flag_force_addr = 0;
529 /* Nonzero for -fdefer-pop: don't pop args after each function call;
530 instead save them up to pop many calls' args with one insns. */
532 int flag_defer_pop = 0;
534 /* Nonzero for -ffloat-store: don't allocate floats and doubles
535 in extended-precision registers. */
537 int flag_float_store = 0;
539 /* Nonzero for -fcse-follow-jumps:
540 have cse follow jumps to do a more extensive job. */
542 int flag_cse_follow_jumps;
544 /* Nonzero for -fcse-skip-blocks:
545 have cse follow a branch around a block. */
546 int flag_cse_skip_blocks;
548 /* Nonzero for -fexpensive-optimizations:
549 perform miscellaneous relatively-expensive optimizations. */
550 int flag_expensive_optimizations;
552 /* Nonzero for -fthread-jumps:
553 have jump optimize output of loop. */
555 int flag_thread_jumps;
557 /* Nonzero enables strength-reduction in loop.c. */
559 int flag_strength_reduce = 0;
561 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
562 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
563 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
566 int flag_unroll_loops;
568 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
569 This is generally not a win. */
571 int flag_unroll_all_loops;
573 /* Nonzero forces all invariant computations in loops to be moved
576 int flag_move_all_movables = 0;
578 /* Nonzero forces all general induction variables in loops to be
581 int flag_reduce_all_givs = 0;
583 /* Nonzero to perform full register move optimization passes. This is the
586 int flag_regmove = 0;
588 /* Nonzero for -fwritable-strings:
589 store string constants in data segment and don't uniquize them. */
591 int flag_writable_strings = 0;
593 /* Nonzero means don't put addresses of constant functions in registers.
594 Used for compiling the Unix kernel, where strange substitutions are
595 done on the assembly output. */
597 int flag_no_function_cse = 0;
599 /* Nonzero for -fomit-frame-pointer:
600 don't make a frame pointer in simple functions that don't require one. */
602 int flag_omit_frame_pointer = 0;
604 /* Nonzero means place each function into its own section on those platforms
605 which support arbitrary section names and unlimited numbers of sections. */
607 int flag_function_sections = 0;
609 /* ... and similar for data. */
611 int flag_data_sections = 0;
613 /* Nonzero to inhibit use of define_optimization peephole opts. */
615 int flag_no_peephole = 0;
617 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
619 int flag_optimize_sibling_calls = 0;
621 /* Nonzero means the front end generally wants `errno' maintained by math
622 operations, like built-in SQRT. */
624 int flag_errno_math = 1;
626 /* Nonzero means that unsafe floating-point math optimizations are allowed
627 for the sake of speed. IEEE compliance is not guaranteed, and operations
628 are allowed to assume that their arguments and results are "normal"
629 (e.g., nonnegative for SQRT). */
631 int flag_unsafe_math_optimizations = 0;
633 /* Zero means that floating-point math operations cannot generate a
634 (user-visible) trap. This is the case, for example, in nonstop
635 IEEE 754 arithmetic. */
637 int flag_trapping_math = 1;
639 /* 0 means straightforward implementation of complex divide acceptable.
640 1 means wide ranges of inputs must work for complex divide.
641 2 means C99-like requirements for complex divide (not yet implemented). */
643 int flag_complex_divide_method = 0;
645 /* Nonzero means all references through pointers are volatile. */
649 /* Nonzero means treat all global and extern variables as volatile. */
651 int flag_volatile_global;
653 /* Nonzero means treat all static variables as volatile. */
655 int flag_volatile_static;
657 /* Nonzero means just do syntax checking; don't output anything. */
659 int flag_syntax_only = 0;
661 /* Nonzero means perform global cse. */
663 static int flag_gcse;
665 /* Nonzero means to use global dataflow analysis to eliminate
666 useless null pointer tests. */
668 static int flag_delete_null_pointer_checks;
670 /* Nonzero means to do the enhanced load motion during gcse, which trys
671 to hoist loads by not killing them when a store to the same location
674 int flag_gcse_lm = 1;
676 /* Nonzero means to perform store motion after gcse, which will try to
677 move stores closer to the exit block. Its not very effective without
680 int flag_gcse_sm = 1;
682 /* Nonzero means to rerun cse after loop optimization. This increases
683 compilation time about 20% and picks up a few more common expressions. */
685 static int flag_rerun_cse_after_loop;
687 /* Nonzero means to run loop optimizations twice. */
689 int flag_rerun_loop_opt;
691 /* Nonzero for -finline-functions: ok to inline functions that look like
692 good inline candidates. */
694 int flag_inline_functions;
696 /* Nonzero for -fkeep-inline-functions: even if we make a function
697 go inline everywhere, keep its definition around for debugging
700 int flag_keep_inline_functions;
702 /* Nonzero means that functions will not be inlined. */
706 /* Nonzero means that we should emit static const variables
707 regardless of whether or not optimization is turned on. */
709 int flag_keep_static_consts = 1;
711 /* Nonzero means we should be saving declaration info into a .X file. */
713 int flag_gen_aux_info = 0;
715 /* Specified name of aux-info file. */
717 static char *aux_info_file_name;
719 /* Nonzero means make the text shared if supported. */
721 int flag_shared_data;
723 /* Nonzero means schedule into delayed branch slots if supported. */
725 int flag_delayed_branch;
727 /* Nonzero if we are compiling pure (sharable) code.
728 Value is 1 if we are doing reasonable (i.e. simple
729 offset into offset table) pic. Value is 2 if we can
730 only perform register offsets. */
734 /* Nonzero means generate extra code for exception handling and enable
735 exception handling. */
739 /* Nonzero means generate frame unwind info table when supported. */
741 int flag_unwind_tables = 0;
743 /* Nonzero means don't place uninitialized global data in common storage
748 /* Nonzero means pretend it is OK to examine bits of target floats,
749 even if that isn't true. The resulting code will have incorrect constants,
750 but the same series of instructions that the native compiler would make. */
752 int flag_pretend_float;
754 /* Nonzero means change certain warnings into errors.
755 Usually these are warnings about failure to conform to some standard. */
757 int flag_pedantic_errors = 0;
759 /* flag_schedule_insns means schedule insns within basic blocks (before
761 flag_schedule_insns_after_reload means schedule insns after
764 int flag_schedule_insns = 0;
765 int flag_schedule_insns_after_reload = 0;
767 /* The following flags have effect only for scheduling before register
770 flag_schedule_interblock means schedule insns accross basic blocks.
771 flag_schedule_speculative means allow speculative motion of non-load insns.
772 flag_schedule_speculative_load means allow speculative motion of some
774 flag_schedule_speculative_load_dangerous allows speculative motion of more
777 int flag_schedule_interblock = 1;
778 int flag_schedule_speculative = 1;
779 int flag_schedule_speculative_load = 0;
780 int flag_schedule_speculative_load_dangerous = 0;
782 int flag_single_precision_constant;
784 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
785 by a cheaper branch on a count register. */
786 int flag_branch_on_count_reg = 1;
788 /* -finhibit-size-directive inhibits output of .size for ELF.
789 This is used only for compiling crtstuff.c,
790 and it may be extended to other effects
791 needed for crtstuff.c on other systems. */
792 int flag_inhibit_size_directive = 0;
794 /* -fverbose-asm causes extra commentary information to be produced in
795 the generated assembly code (to make it more readable). This option
796 is generally only of use to those who actually need to read the
797 generated assembly code (perhaps while debugging the compiler itself).
798 -fno-verbose-asm, the default, causes the extra information
799 to be omitted and is useful when comparing two assembler files. */
801 int flag_verbose_asm = 0;
803 /* -dA causes debug commentary information to be produced in
804 the generated assembly code (to make it more readable). This option
805 is generally only of use to those who actually need to read the
806 generated assembly code (perhaps while debugging the compiler itself).
807 Currently, this switch is only used by dwarfout.c; however, it is intended
808 to be a catchall for printing debug information in the assembler file. */
810 int flag_debug_asm = 0;
812 /* -dP causes the rtl to be emitted as a comment in assembly. */
814 int flag_dump_rtl_in_asm = 0;
816 /* -fgnu-linker specifies use of the GNU linker for initializations.
817 (Or, more generally, a linker that handles initializations.)
818 -fno-gnu-linker says that collect2 will be used. */
820 int flag_gnu_linker = 0;
822 int flag_gnu_linker = 1;
828 /* Enable ssa conditional constant propagation. */
829 int flag_ssa_ccp = 0;
831 /* Enable ssa aggressive dead code elimination. */
832 int flag_ssa_dce = 0;
834 /* Tag all structures with __attribute__(packed). */
835 int flag_pack_struct = 0;
837 /* Emit code to check for stack overflow; also may cause large objects
838 to be allocated dynamically. */
839 int flag_stack_check;
841 /* When non-NULL, indicates that whenever space is allocated on the
842 stack, the resulting stack pointer must not pass this
843 address---that is, for stacks that grow downward, the stack pointer
844 must always be greater than or equal to this address; for stacks
845 that grow upward, the stack pointer must be less than this address.
846 At present, the rtx may be either a REG or a SYMBOL_REF, although
847 the support provided depends on the backend. */
850 /* -fcheck-memory-usage causes extra code to be generated in order to check
851 memory accesses. This is used by a detector of bad memory accesses such
853 int flag_check_memory_usage = 0;
855 /* -fprefix-function-name causes function name to be prefixed. This
856 can be used with -fcheck-memory-usage to isolate code compiled with
857 -fcheck-memory-usage. */
858 int flag_prefix_function_name = 0;
860 /* 0 if pointer arguments may alias each other. True in C.
861 1 if pointer arguments may not alias each other but may alias
863 2 if pointer arguments may not alias each other and may not
864 alias global variables. True in Fortran.
865 This defaults to 0 for C. */
866 int flag_argument_noalias = 0;
868 /* Nonzero if we should do (language-dependent) alias analysis.
869 Typically, this analysis will assume that expressions of certain
870 types do not alias expressions of certain other types. Only used
871 if alias analysis (in general) is enabled. */
872 int flag_strict_aliasing = 0;
874 /* Instrument functions with calls at entry and exit, for profiling. */
875 int flag_instrument_function_entry_exit = 0;
877 /* Nonzero means ignore `#ident' directives. 0 means handle them.
878 On SVR4 targets, it also controls whether or not to emit a
879 string identifying the compiler. */
881 int flag_no_ident = 0;
883 /* This will perform a peephole pass before sched2. */
884 int flag_peephole2 = 0;
886 /* This will try to guess branch probabilities. */
887 int flag_guess_branch_prob = 0;
889 /* -fbounded-pointers causes gcc to compile pointers as composite
890 objects occupying three words: the pointer value, the base address
891 of the referent object, and the address immediately beyond the end
892 of the referent object. The base and extent allow us to perform
893 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
894 int flag_bounded_pointers = 0;
896 /* -fcheck-bounds causes gcc to generate array bounds checks.
897 For C, C++: defaults to value of flag_bounded_pointers.
898 For ObjC: defaults to off.
899 For Java: defaults to on.
900 For Fortran: defaults to off.
901 For CHILL: defaults to off. */
902 int flag_bounds_check = 0;
904 /* If one, renumber instruction UIDs to reduce the number of
905 unused UIDs if there are a lot of instructions. If greater than
906 one, unconditionally renumber instruction UIDs. */
907 int flag_renumber_insns = 1;
909 /* Values of the -falign-* flags: how much to align labels in code.
910 0 means `use default', 1 means `don't align'.
911 For each variable, there is an _log variant which is the power
912 of two not less than the variable, for .align output. */
919 int align_labels_log;
921 int align_functions_log;
923 /* Table of supported debugging formats. */
927 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
928 constant expression, we use NO_DEBUG in its place. */
929 enum debug_info_type debug_type;
930 int use_extensions_p;
931 const char *description;
935 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
936 N_("Generate debugging info in default format") },
937 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
938 #ifdef DBX_DEBUGGING_INFO
939 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
940 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
942 #ifdef DWARF_DEBUGGING_INFO
943 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
944 { "dwarf+", DWARF_DEBUG, 1,
945 N_("Generate extended DWARF-1 format debug info") },
947 #ifdef DWARF2_DEBUGGING_INFO
948 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
950 #ifdef XCOFF_DEBUGGING_INFO
951 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
952 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
954 #ifdef SDB_DEBUGGING_INFO
955 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
965 const char *description;
967 lang_independent_options;
971 /* Add or remove a leading underscore from user symbols. */
972 int flag_leading_underscore = -1;
974 /* The user symbol prefix after having resolved same. */
975 const char *user_label_prefix;
977 static const param_info lang_independent_params[] = {
978 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
979 { OPTION, DEFAULT, HELP },
980 #include "params.def"
985 /* A default for same. */
986 #ifndef USER_LABEL_PREFIX
987 #define USER_LABEL_PREFIX ""
990 /* Table of language-independent -f options.
991 STRING is the option name. VARIABLE is the address of the variable.
992 ON_VALUE is the value to store in VARIABLE
993 if `-fSTRING' is seen as an option.
994 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
996 lang_independent_options f_options[] =
998 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
999 N_("Perform DWARF2 duplicate elimination") },
1000 {"float-store", &flag_float_store, 1,
1001 N_("Do not store floats in registers") },
1002 {"volatile", &flag_volatile, 1,
1003 N_("Consider all mem refs through pointers as volatile") },
1004 {"volatile-global", &flag_volatile_global, 1,
1005 N_("Consider all mem refs to global data to be volatile") },
1006 {"volatile-static", &flag_volatile_static, 1,
1007 N_("Consider all mem refs to static data to be volatile") },
1008 {"defer-pop", &flag_defer_pop, 1,
1009 N_("Defer popping functions args from stack until later") },
1010 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1011 N_("When possible do not generate stack frames") },
1012 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1013 N_("Optimize sibling and tail recursive calls") },
1014 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1015 N_("When running CSE, follow jumps to their targets") },
1016 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1017 N_("When running CSE, follow conditional jumps") },
1018 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1019 N_("Perform a number of minor, expensive optimisations") },
1020 {"thread-jumps", &flag_thread_jumps, 1,
1021 N_("Perform jump threading optimisations") },
1022 {"strength-reduce", &flag_strength_reduce, 1,
1023 N_("Perform strength reduction optimisations") },
1024 {"unroll-loops", &flag_unroll_loops, 1,
1025 N_("Perform loop unrolling when iteration count is known") },
1026 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1027 N_("Perform loop unrolling for all loops") },
1028 {"move-all-movables", &flag_move_all_movables, 1,
1029 N_("Force all loop invariant computations out of loops") },
1030 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1031 N_("Strength reduce all loop general induction variables") },
1032 {"writable-strings", &flag_writable_strings, 1,
1033 N_("Store strings in writable data section") },
1034 {"peephole", &flag_no_peephole, 0,
1035 N_("Enable machine specific peephole optimisations") },
1036 {"force-mem", &flag_force_mem, 1,
1037 N_("Copy memory operands into registers before using") },
1038 {"force-addr", &flag_force_addr, 1,
1039 N_("Copy memory address constants into regs before using") },
1040 {"function-cse", &flag_no_function_cse, 0,
1041 N_("Allow function addresses to be held in registers") },
1042 {"inline-functions", &flag_inline_functions, 1,
1043 N_("Integrate simple functions into their callers") },
1044 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1045 N_("Generate code for funcs even if they are fully inlined") },
1046 {"inline", &flag_no_inline, 0,
1047 N_("Pay attention to the 'inline' keyword") },
1048 {"keep-static-consts", &flag_keep_static_consts, 1,
1049 N_("Emit static const variables even if they are not used") },
1050 {"syntax-only", &flag_syntax_only, 1,
1051 N_("Check for syntax errors, then stop") },
1052 {"shared-data", &flag_shared_data, 1,
1053 N_("Mark data as shared rather than private") },
1054 {"caller-saves", &flag_caller_saves, 1,
1055 N_("Enable saving registers around function calls") },
1056 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1057 N_("Return 'short' aggregates in memory, not registers") },
1058 {"reg-struct-return", &flag_pcc_struct_return, 0,
1059 N_("Return 'short' aggregates in registers") },
1060 {"delayed-branch", &flag_delayed_branch, 1,
1061 N_("Attempt to fill delay slots of branch instructions") },
1062 {"gcse", &flag_gcse, 1,
1063 N_("Perform the global common subexpression elimination") },
1064 {"gcse-lm", &flag_gcse_lm, 1,
1065 N_("Perform enhanced load motion during global subexpression elimination") },
1066 {"gcse-sm", &flag_gcse_sm, 1,
1067 N_("Perform store motion after global subexpression elimination") },
1068 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1069 N_("Run CSE pass after loop optimisations") },
1070 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1071 N_("Run the loop optimiser twice") },
1072 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1073 N_("Delete useless null pointer checks") },
1074 {"pretend-float", &flag_pretend_float, 1,
1075 N_("Pretend that host and target use the same FP format") },
1076 {"schedule-insns", &flag_schedule_insns, 1,
1077 N_("Reschedule instructions before register allocation") },
1078 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1079 N_("Reschedule instructions after register allocation") },
1080 {"sched-interblock",&flag_schedule_interblock, 1,
1081 N_("Enable scheduling across basic blocks") },
1082 {"sched-spec",&flag_schedule_speculative, 1,
1083 N_("Allow speculative motion of non-loads") },
1084 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1085 N_("Allow speculative motion of some loads") },
1086 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1087 N_("Allow speculative motion of more loads") },
1088 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1089 N_("Replace add,compare,branch with branch on count reg") },
1090 {"pic", &flag_pic, 1,
1091 N_("Generate position independent code, if possible") },
1092 {"PIC", &flag_pic, 2, ""},
1093 {"exceptions", &flag_exceptions, 1,
1094 N_("Enable exception handling") },
1095 {"unwind-tables", &flag_unwind_tables, 1,
1096 N_("Just generate unwind tables for exception handling") },
1097 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1098 N_("Support synchronous non-call exceptions") },
1099 {"profile-arcs", &profile_arc_flag, 1,
1100 N_("Insert arc based program profiling code") },
1101 {"test-coverage", &flag_test_coverage, 1,
1102 N_("Create data files needed by gcov") },
1103 {"branch-probabilities", &flag_branch_probabilities, 1,
1104 N_("Use profiling information for branch probabilities") },
1105 {"reorder-blocks", &flag_reorder_blocks, 1,
1106 N_("Reorder basic blocks to improve code placement") },
1107 {"rename-registers", &flag_rename_registers, 1,
1108 N_("Do the register renaming optimization pass") },
1109 {"common", &flag_no_common, 0,
1110 N_("Do not put unitialised globals in the common section") },
1111 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1112 N_("Do not generate .size directives") },
1113 {"function-sections", &flag_function_sections, 1,
1114 N_("place each function into its own section") },
1115 {"data-sections", &flag_data_sections, 1,
1116 N_("place data items into their own section") },
1117 {"verbose-asm", &flag_verbose_asm, 1,
1118 N_("Add extra commentry to assembler output") },
1119 {"gnu-linker", &flag_gnu_linker, 1,
1120 N_("Output GNU ld formatted global initialisers") },
1121 {"regmove", &flag_regmove, 1,
1122 N_("Enables a register move optimisation") },
1123 {"optimize-register-move", &flag_regmove, 1,
1124 N_("Do the full regmove optimization pass") },
1125 {"pack-struct", &flag_pack_struct, 1,
1126 N_("Pack structure members together without holes") },
1127 {"stack-check", &flag_stack_check, 1,
1128 N_("Insert stack checking code into the program") },
1129 {"argument-alias", &flag_argument_noalias, 0,
1130 N_("Specify that arguments may alias each other & globals") },
1131 {"argument-noalias", &flag_argument_noalias, 1,
1132 N_("Assume arguments may alias globals but not each other") },
1133 {"argument-noalias-global", &flag_argument_noalias, 2,
1134 N_("Assume arguments do not alias each other or globals") },
1135 {"strict-aliasing", &flag_strict_aliasing, 1,
1136 N_("Assume strict aliasing rules apply") },
1137 {"align-loops", &align_loops, 0,
1138 N_("Align the start of loops") },
1139 {"align-jumps", &align_jumps, 0,
1140 N_("Align labels which are only reached by jumping") },
1141 {"align-labels", &align_labels, 0,
1142 N_("Align all labels") },
1143 {"align-functions", &align_functions, 0,
1144 N_("Align the start of functions") },
1145 {"check-memory-usage", &flag_check_memory_usage, 1,
1146 N_("Generate code to check every memory access") },
1147 {"prefix-function-name", &flag_prefix_function_name, 1,
1148 N_("Add a prefix to all function names") },
1149 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1150 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1151 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1152 N_("Instrument function entry/exit with profiling calls") },
1153 {"ssa", &flag_ssa, 1,
1154 N_("Enable SSA optimizations") },
1155 {"ssa-ccp", &flag_ssa_ccp, 1,
1156 N_("Enable SSA conditonal constant propagation") },
1157 {"ssa-dce", &flag_ssa_dce, 1,
1158 N_("Enable aggressive SSA dead code elimination") },
1159 {"leading-underscore", &flag_leading_underscore, 1,
1160 N_("External symbols have a leading underscore") },
1161 {"ident", &flag_no_ident, 0,
1162 N_("Process #ident directives") },
1163 { "peephole2", &flag_peephole2, 1,
1164 N_("Enables an rtl peephole pass run before sched2") },
1165 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1166 N_("Enables guessing of branch probabilities") },
1167 {"math-errno", &flag_errno_math, 1,
1168 N_("Set errno after built-in math functions") },
1169 {"trapping-math", &flag_trapping_math, 1,
1170 N_("Floating-point operations can trap") },
1171 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1172 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1173 {"bounded-pointers", &flag_bounded_pointers, 1,
1174 N_("Compile pointers as triples: value, base & end") },
1175 {"bounds-check", &flag_bounds_check, 1,
1176 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1177 {"single-precision-constant", &flag_single_precision_constant, 1,
1178 N_("Convert floating point constant to single precision constant") },
1179 {"time-report", &time_report, 1,
1180 N_("Report time taken by each compiler pass at end of run") },
1181 {"mem-report", &mem_report, 1,
1182 N_("Report on permanent memory allocation at end of run") },
1183 { "trapv", &flag_trapv, 1,
1184 N_("Trap for signed overflow in addition / subtraction / multiplication.") },
1187 /* Table of language-specific options. */
1189 static struct lang_opt
1192 const char *description;
1194 documented_lang_options[] =
1196 /* In order not to overload the --help output, the convention
1197 used here is to only describe those options which are not
1198 enabled by default. */
1201 N_("Compile just for ISO C89") },
1202 { "-fallow-single-precision",
1203 N_("Do not promote floats to double if using -traditional") },
1205 N_("Determine language standard") },
1207 { "-fsigned-bitfields", "" },
1208 { "-funsigned-bitfields",
1209 N_("Make bitfields by unsigned by default") },
1210 { "-fno-signed-bitfields", "" },
1211 { "-fno-unsigned-bitfields","" },
1213 N_("Make 'char' be signed by default") },
1214 { "-funsigned-char",
1215 N_("Make 'char' be unsigned by default") },
1216 { "-fno-signed-char", "" },
1217 { "-fno-unsigned-char", "" },
1219 { "-ftraditional", "" },
1221 N_("Attempt to support traditional K&R style C") },
1222 { "-fnotraditional", "" },
1223 { "-fno-traditional", "" },
1227 N_("Do not recognise the 'asm' keyword") },
1228 { "-fbuiltin", "" },
1230 N_("Do not recognise any built in functions") },
1232 N_("Assume normal C execution environment") },
1233 { "-fno-hosted", "" },
1235 N_("Assume that standard libraries & main might not exist") },
1236 { "-fno-freestanding", "" },
1237 { "-fcond-mismatch",
1238 N_("Allow different types as args of ? operator") },
1239 { "-fno-cond-mismatch", "" },
1240 { "-fdollars-in-identifiers",
1241 N_("Allow the use of $ inside identifiers") },
1242 { "-fno-dollars-in-identifiers", "" },
1243 { "-fpreprocessed", "" },
1244 { "-fno-preprocessed", "" },
1246 N_("Use the same size for double as for float") },
1247 { "-fno-short-double", "" },
1249 N_("Use the smallest fitting integer to hold enums") },
1250 { "-fno-short-enums", "" },
1252 N_("Override the underlying type for wchar_t to `unsigned short'") },
1253 { "-fno-short-wchar", "" },
1256 N_("Enable most warning messages") },
1257 { "-Wbad-function-cast",
1258 N_("Warn about casting functions to incompatible types") },
1259 { "-Wno-bad-function-cast", "" },
1260 { "-Wno-missing-noreturn", "" },
1261 { "-Wmissing-format-attribute",
1262 N_("Warn about functions which might be candidates for format attributes") },
1263 { "-Wno-missing-format-attribute", "" },
1265 N_("Warn about casts which discard qualifiers") },
1266 { "-Wno-cast-qual", "" },
1267 { "-Wchar-subscripts",
1268 N_("Warn about subscripts whose type is 'char'") },
1269 { "-Wno-char-subscripts", "" },
1271 N_("Warn if nested comments are detected") },
1272 { "-Wno-comment", "" },
1274 N_("Warn if nested comments are detected") },
1275 { "-Wno-comments", "" },
1277 N_("Warn about possibly confusing type conversions") },
1278 { "-Wno-conversion", "" },
1280 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1281 { "-Wno-format", "" },
1282 { "-Wformat-y2k", "" },
1283 { "-Wno-format-y2k",
1284 N_("Don't warn about strftime formats yielding 2 digit years") },
1285 { "-Wformat-extra-args", "" },
1286 { "-Wno-format-extra-args",
1287 N_("Don't warn about too many arguments to format functions") },
1288 { "-Wformat-nonliteral",
1289 N_("Warn about non-string-literal format strings") },
1290 { "-Wno-format-nonliteral", "" },
1291 { "-Wformat-security",
1292 N_("Warn about possible security problems with format functions") },
1293 { "-Wno-format-security", "" },
1294 { "-Wimplicit-function-declaration",
1295 N_("Warn about implicit function declarations") },
1296 { "-Wno-implicit-function-declaration", "" },
1297 { "-Werror-implicit-function-declaration", "" },
1299 N_("Warn when a declaration does not specify a type") },
1300 { "-Wno-implicit-int", "" },
1301 { "-Wimplicit", "" },
1302 { "-Wno-implicit", "" },
1304 N_("Warn about the use of the #import directive") },
1305 { "-Wno-import", "" },
1306 { "-Wlong-long","" },
1308 N_("Do not warn about using 'long long' when -pedantic") },
1310 N_("Warn about suspicious declarations of main") },
1311 { "-Wno-main", "" },
1312 { "-Wmissing-braces",
1313 N_("Warn about possibly missing braces around initialisers") },
1314 { "-Wno-missing-braces", "" },
1315 { "-Wmissing-declarations",
1316 N_("Warn about global funcs without previous declarations") },
1317 { "-Wno-missing-declarations", "" },
1318 { "-Wmissing-prototypes",
1319 N_("Warn about global funcs without prototypes") },
1320 { "-Wno-missing-prototypes", "" },
1322 N_("Warn about use of multicharacter literals") },
1323 { "-Wno-multichar", "" },
1324 { "-Wnested-externs",
1325 N_("Warn about externs not at file scope level") },
1326 { "-Wno-nested-externs", "" },
1328 N_("Warn about possible missing parentheses") },
1329 { "-Wno-parentheses", "" },
1330 { "-Wsequence-point",
1331 N_("Warn about possible violations of sequence point rules") },
1332 { "-Wno-sequence-point", "" },
1333 { "-Wpointer-arith",
1334 N_("Warn about function pointer arithmetic") },
1335 { "-Wno-pointer-arith", "" },
1336 { "-Wredundant-decls",
1337 N_("Warn about multiple declarations of the same object") },
1338 { "-Wno-redundant-decls", "" },
1340 N_("Warn about signed/unsigned comparisons") },
1341 { "-Wno-sign-compare", "" },
1343 N_("Warn about testing equality of floating point numbers") },
1344 { "-Wno-float-equal", "" },
1345 { "-Wunknown-pragmas",
1346 N_("Warn about unrecognized pragmas") },
1347 { "-Wno-unknown-pragmas", "" },
1348 { "-Wstrict-prototypes",
1349 N_("Warn about non-prototyped function decls") },
1350 { "-Wno-strict-prototypes", "" },
1352 N_("Warn about constructs whose meaning change in ISO C") },
1353 { "-Wno-traditional", "" },
1355 N_("Warn when trigraphs are encountered") },
1356 { "-Wno-trigraphs", "" },
1358 { "-Wno-undef", "" },
1359 { "-Wwrite-strings",
1360 N_("Mark strings as 'const char *'") },
1361 { "-Wno-write-strings", "" },
1363 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1365 #include "options.h"
1369 /* Here is a table, controlled by the tm.h file, listing each -m switch
1370 and which bits in `target_switches' it should set or clear.
1371 If VALUE is positive, it is bits to set.
1372 If VALUE is negative, -VALUE is bits to clear.
1373 (The sign bit is not used so there is no confusion.) */
1379 const char *description;
1381 target_switches [] = TARGET_SWITCHES;
1383 /* This table is similar, but allows the switch to have a value. */
1385 #ifdef TARGET_OPTIONS
1389 const char **variable;
1390 const char *description;
1392 target_options [] = TARGET_OPTIONS;
1395 /* Options controlling warnings. */
1397 /* Don't print warning messages. -w. */
1399 int inhibit_warnings = 0;
1401 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1403 int warn_system_headers = 0;
1405 /* Print various extra warnings. -W. */
1407 int extra_warnings = 0;
1409 /* Treat warnings as errors. -Werror. */
1411 int warnings_are_errors = 0;
1413 /* Nonzero to warn about unused variables, functions et.al. */
1415 int warn_unused_function;
1416 int warn_unused_label;
1417 int warn_unused_parameter;
1418 int warn_unused_variable;
1419 int warn_unused_value;
1422 set_Wunused (setting)
1425 warn_unused_function = setting;
1426 warn_unused_label = setting;
1427 /* Unused function parameter warnings are reported when either ``-W
1428 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1429 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1431 warn_unused_parameter = 0;
1432 else if (!warn_unused_parameter)
1433 warn_unused_parameter = -1;
1434 warn_unused_variable = setting;
1435 warn_unused_value = setting;
1438 /* Nonzero to warn about code which is never reached. */
1440 int warn_notreached;
1442 /* Nonzero to warn about variables used before they are initialized. */
1444 int warn_uninitialized;
1446 /* Nonzero means warn about all declarations which shadow others. */
1450 /* Warn if a switch on an enum fails to have a case for every enum value. */
1454 /* Nonzero means warn about function definitions that default the return type
1455 or that use a null return and have a return-type other than void. */
1457 int warn_return_type;
1459 /* Nonzero means warn about pointer casts that increase the required
1460 alignment of the target type (and might therefore lead to a crash
1461 due to a misaligned access). */
1463 int warn_cast_align;
1465 /* Nonzero means warn about any objects definitions whose size is larger
1466 than N bytes. Also want about function definitions whose returned
1467 values are larger than N bytes. The value N is in `larger_than_size'. */
1469 int warn_larger_than;
1470 HOST_WIDE_INT larger_than_size;
1472 /* Nonzero means warn if inline function is too large. */
1476 /* Warn if a function returns an aggregate,
1477 since there are often incompatible calling conventions for doing this. */
1479 int warn_aggregate_return;
1481 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1485 /* Warn when gcc pads a structure to an alignment boundary. */
1489 /* Warn when an optimization pass is disabled. */
1491 int warn_disabled_optimization;
1493 /* Warn about functions which might be candidates for attribute noreturn. */
1495 int warn_missing_noreturn;
1497 /* Likewise for -W. */
1499 lang_independent_options W_options[] =
1501 {"unused-function", &warn_unused_function, 1,
1502 N_("Warn when a function is unused") },
1503 {"unused-label", &warn_unused_label, 1,
1504 N_("Warn when a label is unused") },
1505 {"unused-parameter", &warn_unused_parameter, 1,
1506 N_("Warn when a function parameter is unused") },
1507 {"unused-variable", &warn_unused_variable, 1,
1508 N_("Warn when a variable is unused") },
1509 {"unused-value", &warn_unused_value, 1,
1510 N_("Warn when an expression value is unused") },
1511 {"system-headers", &warn_system_headers, 1,
1512 N_("Do not suppress warnings from system headers") },
1513 {"error", &warnings_are_errors, 1,
1514 N_("Treat all warnings as errors") },
1515 {"shadow", &warn_shadow, 1,
1516 N_("Warn when one local variable shadows another") },
1517 {"switch", &warn_switch, 1,
1518 N_("Warn about enumerated switches missing a specific case") },
1519 {"aggregate-return", &warn_aggregate_return, 1,
1520 N_("Warn about returning structures, unions or arrays") },
1521 {"cast-align", &warn_cast_align, 1,
1522 N_("Warn about pointer casts which increase alignment") },
1523 {"unreachable-code", &warn_notreached, 1,
1524 N_("Warn about code that will never be executed") },
1525 {"uninitialized", &warn_uninitialized, 1,
1526 N_("Warn about unitialized automatic variables") },
1527 {"inline", &warn_inline, 1,
1528 N_("Warn when an inlined function cannot be inlined") },
1529 {"packed", &warn_packed, 1,
1530 N_("Warn when the packed attribute has no effect on struct layout") },
1531 {"padded", &warn_padded, 1,
1532 N_("Warn when padding is required to align struct members") },
1533 {"disabled-optimization", &warn_disabled_optimization, 1,
1534 N_("Warn when an optimization pass is disabled") },
1535 {"missing-noreturn", &warn_missing_noreturn, 1,
1536 N_("Warn about functions which might be candidates for attribute noreturn") }
1539 /* The following routines are useful in setting all the flags that
1540 -ffast-math and -fno-fast-math imply. */
1543 set_fast_math_flags ()
1545 flag_trapping_math = 0;
1546 flag_unsafe_math_optimizations = 1;
1547 flag_errno_math = 0;
1551 set_no_fast_math_flags ()
1553 flag_trapping_math = 1;
1554 flag_unsafe_math_optimizations = 0;
1555 flag_errno_math = 1;
1559 /* Output files for assembler code (real compiler output)
1560 and debugging dumps. */
1563 FILE *aux_info_file;
1564 FILE *rtl_dump_file = NULL;
1566 /* Decode the string P as an integral parameter.
1567 If the string is indeed an integer return its numeric value else
1568 issue an Invalid Option error for the option PNAME and return DEFVAL.
1569 If PNAME is zero just return DEFVAL, do not call error. */
1572 read_integral_parameter (p, pname, defval)
1577 const char *endp = p;
1581 if (*endp >= '0' && *endp <= '9')
1590 error ("Invalid option `%s'", pname);
1598 /* This is the default decl_printable_name function. */
1601 decl_name (decl, verbosity)
1603 int verbosity ATTRIBUTE_UNUSED;
1605 return IDENTIFIER_POINTER (DECL_NAME (decl));
1609 /* This calls abort and is used to avoid problems when abort if a macro.
1610 It is used when we need to pass the address of abort. */
1618 /* When `malloc.c' is compiled with `rcheck' defined,
1619 it calls this function to report clobberage. */
1623 const char *s ATTRIBUTE_UNUSED;
1628 /* Return the logarithm of X, base 2, considering X unsigned,
1629 if X is a power of 2. Otherwise, returns -1.
1631 This should be used via the `exact_log2' macro. */
1635 register unsigned HOST_WIDE_INT x;
1637 register int log = 0;
1638 /* Test for 0 or a power of 2. */
1639 if (x == 0 || x != (x & -x))
1641 while ((x >>= 1) != 0)
1646 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1647 If X is 0, return -1.
1649 This should be used via the floor_log2 macro. */
1653 register unsigned HOST_WIDE_INT x;
1655 register int log = -1;
1662 static int float_handler_set;
1664 jmp_buf float_handler;
1666 /* Signals actually come here. */
1669 float_signal (signo)
1670 /* If this is missing, some compilers complain. */
1671 int signo ATTRIBUTE_UNUSED;
1673 if (float_handled == 0)
1674 crash_signal (signo);
1677 /* On System-V derived systems, we must reinstall the signal handler.
1678 This is harmless on BSD-derived systems. */
1679 signal (SIGFPE, float_signal);
1680 longjmp (float_handler, 1);
1683 /* Specify where to longjmp to when a floating arithmetic error happens.
1684 If HANDLER is 0, it means don't handle the errors any more. */
1687 set_float_handler (handler)
1690 float_handled = (handler != 0);
1692 memcpy (float_handler, handler, sizeof (float_handler));
1694 if (float_handled && ! float_handler_set)
1696 signal (SIGFPE, float_signal);
1697 float_handler_set = 1;
1701 /* This is a wrapper function for code which might elicit an
1702 arithmetic exception. That code should be passed in as a function
1703 pointer FN, and one argument DATA. DATA is usually a struct which
1704 contains the real input and output for function FN. This function
1705 returns 0 (failure) if longjmp was called (i.e. an exception
1706 occured.) It returns 1 (success) otherwise. */
1709 do_float_handler (fn, data)
1710 void (*fn) PARAMS ((PTR));
1717 /* We got here via longjmp () caused by an exception in function
1719 set_float_handler (NULL);
1723 set_float_handler (buf);
1725 set_float_handler (NULL);
1729 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1730 into ICE messages, which is much more user friendly. */
1733 crash_signal (signo)
1736 internal_error ("Internal error: %s", strsignal (signo));
1739 /* Strip off a legitimate source ending from the input string NAME of
1740 length LEN. Rather than having to know the names used by all of
1741 our front ends, we strip off an ending of a period followed by
1742 up to five characters. (Java uses ".class".) */
1745 strip_off_ending (name, len)
1750 for (i = 2; i < 6 && len > i; i++)
1752 if (name[len - i] == '.')
1754 name[len - i] = '\0';
1760 /* Output a quoted string. */
1763 output_quoted_string (asm_file, string)
1767 #ifdef OUTPUT_QUOTED_STRING
1768 OUTPUT_QUOTED_STRING (asm_file, string);
1772 putc ('\"', asm_file);
1773 while ((c = *string++) != 0)
1775 if (c == '\"' || c == '\\')
1776 putc ('\\', asm_file);
1779 putc ('\"', asm_file);
1783 /* Output a file name in the form wanted by System V. */
1786 output_file_directive (asm_file, input_name)
1788 const char *input_name;
1790 int len = strlen (input_name);
1791 const char *na = input_name + len;
1793 /* NA gets INPUT_NAME sans directory names. */
1794 while (na > input_name)
1796 if (IS_DIR_SEPARATOR (na[-1]))
1801 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1802 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1804 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1805 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1807 fprintf (asm_file, "\t.file\t");
1808 output_quoted_string (asm_file, na);
1809 fputc ('\n', asm_file);
1814 /* Routine to open a dump file. Return true if the dump file is enabled. */
1817 open_dump_file (index, decl)
1818 enum dump_file_index index;
1822 const char *open_arg;
1825 if (! dump_file[index].enabled)
1828 timevar_push (TV_DUMP);
1829 if (rtl_dump_file != NULL)
1830 fclose (rtl_dump_file);
1832 sprintf (seq, ".%02d.", index);
1834 if (! dump_file[index].initialized)
1836 /* If we've not initialized the files, do so now. */
1837 if (graph_dump_format != no_graph
1838 && dump_file[index].graph_dump_p)
1840 dump_name = concat (seq, dump_file[index].extension, NULL);
1841 clean_graph_dump_file (dump_base_name, dump_name);
1844 dump_file[index].initialized = 1;
1850 dump_name = concat (dump_base_name, seq,
1851 dump_file[index].extension, NULL);
1853 rtl_dump_file = fopen (dump_name, open_arg);
1854 if (rtl_dump_file == NULL)
1855 fatal_io_error ("can't open %s", dump_name);
1860 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1861 decl_printable_name (decl, 2));
1863 timevar_pop (TV_DUMP);
1867 /* Routine to close a dump file. */
1870 close_dump_file (index, func, insns)
1871 enum dump_file_index index;
1872 void (*func) PARAMS ((FILE *, rtx));
1875 if (! rtl_dump_file)
1878 timevar_push (TV_DUMP);
1880 && graph_dump_format != no_graph
1881 && dump_file[index].graph_dump_p)
1886 sprintf (seq, ".%02d.", index);
1887 suffix = concat (seq, dump_file[index].extension, NULL);
1888 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1893 func (rtl_dump_file, insns);
1895 fflush (rtl_dump_file);
1896 fclose (rtl_dump_file);
1898 rtl_dump_file = NULL;
1899 timevar_pop (TV_DUMP);
1902 /* Do any final processing required for the declarations in VEC, of
1903 which there are LEN. We write out inline functions and variables
1904 that have been deferred until this point, but which are required.
1905 Returns non-zero if anything was put out. */
1908 wrapup_global_declarations (vec, len)
1915 int output_something = 0;
1917 for (i = 0; i < len; i++)
1921 /* We're not deferring this any longer. */
1922 DECL_DEFER_OUTPUT (decl) = 0;
1924 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1925 && incomplete_decl_finalize_hook != 0)
1926 (*incomplete_decl_finalize_hook) (decl);
1929 /* Now emit any global variables or functions that we have been
1930 putting off. We need to loop in case one of the things emitted
1931 here references another one which comes earlier in the list. */
1935 for (i = 0; i < len; i++)
1939 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1942 /* Don't write out static consts, unless we still need them.
1944 We also keep static consts if not optimizing (for debugging),
1945 unless the user specified -fno-keep-static-consts.
1946 ??? They might be better written into the debug information.
1947 This is possible when using DWARF.
1949 A language processor that wants static constants to be always
1950 written out (even if it is not used) is responsible for
1951 calling rest_of_decl_compilation itself. E.g. the C front-end
1952 calls rest_of_decl_compilation from finish_decl.
1953 One motivation for this is that is conventional in some
1954 environments to write things like:
1955 static const char rcsid[] = "... version string ...";
1956 intending to force the string to be in the executable.
1958 A language processor that would prefer to have unneeded
1959 static constants "optimized away" would just defer writing
1960 them out until here. E.g. C++ does this, because static
1961 constants are often defined in header files.
1963 ??? A tempting alternative (for both C and C++) would be
1964 to force a constant to be written if and only if it is
1965 defined in a main file, as opposed to an include file. */
1967 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1968 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1969 && !DECL_COMDAT (decl))
1971 && flag_keep_static_consts
1972 && !DECL_ARTIFICIAL (decl))
1973 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1976 rest_of_decl_compilation (decl, NULL, 1, 1);
1979 if (TREE_CODE (decl) == FUNCTION_DECL
1980 && DECL_INITIAL (decl) != 0
1981 && DECL_SAVED_INSNS (decl) != 0
1982 && (flag_keep_inline_functions
1983 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1984 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1987 output_inline_function (decl);
1992 output_something = 1;
1996 return output_something;
1999 /* Issue appropriate warnings for the global declarations in VEC (of
2000 which there are LEN). Output debugging information for them. */
2003 check_global_declarations (vec, len)
2010 for (i = 0; i < len; i++)
2014 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2015 && ! TREE_ASM_WRITTEN (decl))
2016 /* Cancel the RTL for this decl so that, if debugging info
2017 output for global variables is still to come,
2018 this one will be omitted. */
2019 SET_DECL_RTL (decl, NULL_RTX);
2021 /* Warn about any function
2022 declared static but not defined.
2023 We don't warn about variables,
2024 because many programs have static variables
2025 that exist only to get some text into the object file. */
2026 if (TREE_CODE (decl) == FUNCTION_DECL
2027 && (warn_unused_function
2028 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2029 && DECL_INITIAL (decl) == 0
2030 && DECL_EXTERNAL (decl)
2031 && ! DECL_ARTIFICIAL (decl)
2032 && ! TREE_PUBLIC (decl))
2034 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2035 pedwarn_with_decl (decl,
2036 "`%s' used but never defined");
2038 warning_with_decl (decl,
2039 "`%s' declared `static' but never defined");
2040 /* This symbol is effectively an "extern" declaration now. */
2041 TREE_PUBLIC (decl) = 1;
2042 assemble_external (decl);
2045 /* Warn about static fns or vars defined but not used,
2046 but not about inline functions or static consts
2047 since defining those in header files is normal practice. */
2048 if (((warn_unused_function
2049 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2050 || (warn_unused_variable
2051 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2052 && ! DECL_IN_SYSTEM_HEADER (decl)
2053 && ! DECL_EXTERNAL (decl)
2054 && ! TREE_PUBLIC (decl)
2055 && ! TREE_USED (decl)
2056 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2057 /* The TREE_USED bit for file-scope decls
2058 is kept in the identifier, to handle multiple
2059 external decls in different scopes. */
2060 && ! TREE_USED (DECL_NAME (decl)))
2061 warning_with_decl (decl, "`%s' defined but not used");
2063 timevar_push (TV_SYMOUT);
2064 #ifdef SDB_DEBUGGING_INFO
2065 /* The COFF linker can move initialized global vars to the end.
2066 And that can screw up the symbol ordering.
2067 By putting the symbols in that order to begin with,
2068 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2069 if (write_symbols == SDB_DEBUG && TREE_CODE (decl) == VAR_DECL
2070 && TREE_PUBLIC (decl) && DECL_INITIAL (decl)
2071 && ! DECL_EXTERNAL (decl)
2072 && DECL_RTL (decl) != 0)
2073 sdbout_symbol (decl, 0);
2075 /* Output COFF information for non-global
2076 file-scope initialized variables. */
2077 if (write_symbols == SDB_DEBUG
2078 && TREE_CODE (decl) == VAR_DECL
2079 && DECL_INITIAL (decl)
2080 && ! DECL_EXTERNAL (decl)
2081 && DECL_RTL (decl) != 0
2082 && GET_CODE (DECL_RTL (decl)) == MEM)
2083 sdbout_toplevel_data (decl);
2084 #endif /* SDB_DEBUGGING_INFO */
2085 #ifdef DWARF_DEBUGGING_INFO
2086 /* Output DWARF information for file-scope tentative data object
2087 declarations, file-scope (extern) function declarations (which
2088 had no corresponding body) and file-scope tagged type declarations
2089 and definitions which have not yet been forced out. */
2091 if (write_symbols == DWARF_DEBUG
2092 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2093 dwarfout_file_scope_decl (decl, 1);
2095 #ifdef DWARF2_DEBUGGING_INFO
2096 /* Output DWARF2 information for file-scope tentative data object
2097 declarations, file-scope (extern) function declarations (which
2098 had no corresponding body) and file-scope tagged type declarations
2099 and definitions which have not yet been forced out. */
2101 if (write_symbols == DWARF2_DEBUG
2102 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2103 dwarf2out_decl (decl);
2105 timevar_pop (TV_SYMOUT);
2109 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2110 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2111 INPUT_FILENAME and LINENO accordingly. */
2114 push_srcloc (file, line)
2118 struct file_stack *fs;
2120 if (input_file_stack)
2122 input_file_stack->name = input_filename;
2123 input_file_stack->line = lineno;
2126 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2127 fs->name = input_filename = file;
2128 fs->line = lineno = line;
2129 fs->indent_level = 0;
2130 fs->next = input_file_stack;
2131 input_file_stack = fs;
2132 input_file_stack_tick++;
2135 /* Pop the top entry off the stack of presently open source files.
2136 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2142 struct file_stack *fs;
2144 fs = input_file_stack;
2145 input_file_stack = fs->next;
2147 input_file_stack_tick++;
2148 /* The initial source file is never popped. */
2149 if (!input_file_stack)
2151 input_filename = input_file_stack->name;
2152 lineno = input_file_stack->line;
2155 /* Compile an entire file of output from cpp, named NAME.
2156 Write a file of assembly output and various debugging dumps. */
2164 int name_specified = name != 0;
2166 if (dump_base_name == 0)
2167 dump_base_name = name ? name : "gccdump";
2172 /* Start timing total execution time. */
2175 timevar_start (TV_TOTAL);
2177 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2178 because then the driver will have provided the name of a temporary
2179 file or bit bucket for us. */
2181 if (! name_specified && asm_file_name == 0)
2182 asm_out_file = stdout;
2185 if (asm_file_name == 0)
2187 int len = strlen (dump_base_name);
2188 char *dumpname = (char *) xmalloc (len + 6);
2189 memcpy (dumpname, dump_base_name, len + 1);
2190 strip_off_ending (dumpname, len);
2191 strcat (dumpname, ".s");
2192 asm_file_name = dumpname;
2194 if (!strcmp (asm_file_name, "-"))
2195 asm_out_file = stdout;
2197 asm_out_file = fopen (asm_file_name, "w");
2198 if (asm_out_file == 0)
2199 fatal_io_error ("can't open %s for writing", asm_file_name);
2202 /* Initialize data in various passes. */
2205 name = init_parse (name);
2206 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2207 || debug_info_level == DINFO_LEVEL_VERBOSE
2208 || flag_test_coverage
2209 || warn_notreached);
2212 init_decl_processing ();
2218 init_function_once ();
2219 init_stor_layout_once ();
2220 init_varasm_once ();
2221 init_EXPR_INSN_LIST_cache ();
2223 /* The following initialization functions need to generate rtl, so
2224 provide a dummy function context for them. */
2225 init_dummy_function_start ();
2228 if (flag_caller_saves)
2229 init_caller_save ();
2230 expand_dummy_function_end ();
2232 /* If auxiliary info generation is desired, open the output file.
2233 This goes in the same directory as the source file--unlike
2234 all the other output files. */
2235 if (flag_gen_aux_info)
2237 aux_info_file = fopen (aux_info_file_name, "w");
2238 if (aux_info_file == 0)
2239 fatal_io_error ("can't open %s", aux_info_file_name);
2242 #ifdef IO_BUFFER_SIZE
2243 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
2244 _IOFBF, IO_BUFFER_SIZE);
2248 name = ggc_strdup (name);
2250 input_filename = name;
2252 /* Put an entry on the input file stack for the main input file. */
2253 push_srcloc (input_filename, 0);
2255 /* Perform language-specific initialization.
2256 This may set main_input_filename. */
2257 if (lang_hooks.init)
2258 (*lang_hooks.init) ();
2260 /* If the input doesn't start with a #line, use the input name
2261 as the official input file name. */
2262 if (main_input_filename == 0)
2263 main_input_filename = name;
2265 if (flag_syntax_only)
2267 write_symbols = NO_DEBUG;
2269 profile_block_flag = 0;
2273 #ifdef ASM_FILE_START
2274 ASM_FILE_START (asm_out_file);
2277 #ifdef ASM_COMMENT_START
2278 if (flag_verbose_asm)
2280 /* Print the list of options in effect. */
2281 print_version (asm_out_file, ASM_COMMENT_START);
2282 print_switch_values (asm_out_file, 0, MAX_LINE,
2283 ASM_COMMENT_START, " ", "\n");
2284 /* Add a blank line here so it appears in assembler output but not
2286 fprintf (asm_out_file, "\n");
2289 } /* ! flag_syntax_only */
2291 /* Set up the debug hooks based on write_symbols. Default to doing
2293 debug_hooks = &do_nothing_debug_hooks;
2294 #if defined(DBX_DEBUGGING_INFO)
2295 if (write_symbols == DBX_DEBUG)
2296 debug_hooks = &dbx_debug_hooks;
2298 #if defined(XCOFF_DEBUGGING_INFO)
2299 if (write_symbols == XCOFF_DEBUG)
2300 debug_hooks = &xcoff_debug_hooks;
2302 #ifdef SDB_DEBUGGING_INFO
2303 if (write_symbols == SDB_DEBUG)
2304 debug_hooks = &sdb_debug_hooks;
2306 #ifdef DWARF_DEBUGGING_INFO
2307 if (write_symbols == DWARF_DEBUG)
2308 debug_hooks = &dwarf_debug_hooks;
2310 #ifdef DWARF2_DEBUGGING_INFO
2311 if (write_symbols == DWARF2_DEBUG)
2312 debug_hooks = &dwarf2_debug_hooks;
2315 #ifndef ASM_OUTPUT_SECTION_NAME
2316 if (flag_function_sections)
2318 warning ("-ffunction-sections not supported for this target.");
2319 flag_function_sections = 0;
2321 if (flag_data_sections)
2323 warning ("-fdata-sections not supported for this target.");
2324 flag_data_sections = 0;
2328 if (flag_function_sections
2329 && (profile_flag || profile_block_flag))
2331 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2332 flag_function_sections = 0;
2335 #ifndef OBJECT_FORMAT_ELF
2336 if (flag_function_sections && write_symbols != NO_DEBUG)
2337 warning ("-ffunction-sections may affect debugging on some targets.");
2340 /* If dbx symbol table desired, initialize writing it
2341 and output the predefined types. */
2342 timevar_push (TV_SYMOUT);
2343 #ifdef DWARF2_UNWIND_INFO
2344 if (dwarf2out_do_frame ())
2345 dwarf2out_frame_init ();
2348 (*debug_hooks->init) (asm_out_file, main_input_filename);
2349 timevar_pop (TV_SYMOUT);
2351 /* Initialize yet another pass. */
2353 init_final (main_input_filename);
2354 init_branch_prob (dump_base_name);
2356 timevar_push (TV_PARSE);
2358 /* Call the parser, which parses the entire file
2359 (calling rest_of_compilation for each function). */
2361 if (yyparse () != 0)
2363 if (errorcount == 0)
2364 fnotice (stderr, "Errors detected in input file (your bison.simple is out of date)\n");
2366 /* In case there were missing closebraces,
2367 get us back to the global binding level. */
2368 while (! global_bindings_p ())
2372 /* Compilation is now finished except for writing
2373 what's left of the symbol table output. */
2375 timevar_pop (TV_PARSE);
2377 if (flag_syntax_only)
2380 globals = getdecls ();
2382 /* Really define vars that have had only a tentative definition.
2383 Really output inline functions that must actually be callable
2384 and have not been output so far. */
2387 int len = list_length (globals);
2388 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2392 /* Process the decls in reverse order--earliest first.
2393 Put them into VEC from back to front, then take out from front. */
2395 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2396 vec[len - i - 1] = decl;
2398 wrapup_global_declarations (vec, len);
2400 /* This must occur after the loop to output deferred functions. Else
2401 the profiler initializer would not be emitted if all the functions
2402 in this compilation unit were deferred.
2404 output_func_start_profiler can not cause any additional functions or
2405 data to need to be output, so it need not be in the deferred function
2407 output_func_start_profiler ();
2409 check_global_declarations (vec, len);
2415 /* Write out any pending weak symbol declarations. */
2419 /* Do dbx symbols. */
2420 timevar_push (TV_SYMOUT);
2422 #ifdef DWARF2_UNWIND_INFO
2423 if (dwarf2out_do_frame ())
2424 dwarf2out_frame_finish ();
2427 (*debug_hooks->finish) (asm_out_file, main_input_filename);
2428 timevar_pop (TV_SYMOUT);
2430 /* Output some stuff at end of file if nec. */
2432 dw2_output_indirect_constants ();
2434 end_final (dump_base_name);
2436 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2438 timevar_push (TV_DUMP);
2439 open_dump_file (DFI_bp, NULL);
2443 close_dump_file (DFI_bp, NULL, NULL_RTX);
2444 timevar_pop (TV_DUMP);
2448 ASM_FILE_END (asm_out_file);
2451 /* Attach a special .ident directive to the end of the file to identify
2452 the version of GCC which compiled this code. The format of the .ident
2453 string is patterned after the ones produced by native SVR4 compilers. */
2456 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2457 IDENT_ASM_OP, version_string);
2460 /* Language-specific end of compilation actions. */
2462 if (lang_hooks.finish)
2463 (*lang_hooks.finish) ();
2465 /* Close the dump files. */
2467 if (flag_gen_aux_info)
2469 fclose (aux_info_file);
2471 unlink (aux_info_file_name);
2474 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2476 timevar_push (TV_DUMP);
2477 dump_combine_total_stats (rtl_dump_file);
2478 close_dump_file (DFI_combine, NULL, NULL_RTX);
2479 timevar_pop (TV_DUMP);
2482 /* Close non-debugging input and output files. Take special care to note
2483 whether fclose returns an error, since the pages might still be on the
2484 buffer chain while the file is open. */
2488 if (ferror (asm_out_file) != 0)
2489 fatal_io_error ("error writing to %s", asm_file_name);
2490 if (fclose (asm_out_file) != 0)
2491 fatal_io_error ("error closing %s", asm_file_name);
2493 /* Do whatever is necessary to finish printing the graphs. */
2494 if (graph_dump_format != no_graph)
2498 for (i = 0; i < (int) DFI_MAX; ++i)
2499 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
2504 sprintf (seq, ".%02d.", i);
2505 suffix = concat (seq, dump_file[i].extension, NULL);
2506 finish_graph_dump_file (dump_base_name, suffix);
2513 ggc_print_statistics ();
2514 stringpool_statistics ();
2517 /* Free up memory for the benefit of leak detectors. */
2520 /* Stop timing total execution time. */
2521 timevar_stop (TV_TOTAL);
2523 /* Print the times. */
2525 timevar_print (stderr);
2528 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2529 and TYPE_DECL nodes.
2531 This does nothing for local (non-static) variables, unless the
2532 variable is a register variable with an ASMSPEC. In that case, or
2533 if the variable is not an automatic, it sets up the RTL and
2534 outputs any assembler code (label definition, storage allocation
2535 and initialization).
2537 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2538 the assembler symbol name to be used. TOP_LEVEL is nonzero
2539 if this declaration is not within a function. */
2542 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2544 const char *asmspec;
2548 /* Declarations of variables, and of functions defined elsewhere. */
2550 /* The most obvious approach, to put an #ifndef around where
2551 this macro is used, doesn't work since it's inside a macro call. */
2552 #ifndef ASM_FINISH_DECLARE_OBJECT
2553 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2556 /* Forward declarations for nested functions are not "external",
2557 but we need to treat them as if they were. */
2558 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2559 || TREE_CODE (decl) == FUNCTION_DECL)
2561 timevar_push (TV_VARCONST);
2563 make_decl_rtl (decl, asmspec);
2564 /* Don't output anything
2565 when a tentative file-scope definition is seen.
2566 But at end of compilation, do output code for them. */
2567 if (at_end || !DECL_DEFER_OUTPUT (decl))
2568 assemble_variable (decl, top_level, at_end, 0);
2569 if (decl == last_assemble_variable_decl)
2571 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2574 timevar_pop (TV_VARCONST);
2576 else if (DECL_REGISTER (decl) && asmspec != 0)
2578 if (decode_reg_name (asmspec) >= 0)
2580 SET_DECL_RTL (decl, NULL_RTX);
2581 make_decl_rtl (decl, asmspec);
2585 error ("invalid register name `%s' for register variable", asmspec);
2586 DECL_REGISTER (decl) = 0;
2591 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2592 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2593 && TREE_CODE (decl) == TYPE_DECL)
2595 timevar_push (TV_SYMOUT);
2596 dbxout_symbol (decl, 0);
2597 timevar_pop (TV_SYMOUT);
2600 #ifdef SDB_DEBUGGING_INFO
2601 else if (write_symbols == SDB_DEBUG && top_level
2602 && TREE_CODE (decl) == TYPE_DECL)
2604 timevar_push (TV_SYMOUT);
2605 sdbout_symbol (decl, 0);
2606 timevar_pop (TV_SYMOUT);
2611 /* Called after finishing a record, union or enumeral type. */
2614 rest_of_type_compilation (type, toplev)
2615 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2619 tree type ATTRIBUTE_UNUSED;
2620 int toplev ATTRIBUTE_UNUSED;
2623 timevar_push (TV_SYMOUT);
2624 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2625 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2626 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2628 #ifdef SDB_DEBUGGING_INFO
2629 if (write_symbols == SDB_DEBUG)
2630 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2632 #ifdef DWARF2_DEBUGGING_INFO
2633 if (write_symbols == DWARF2_DEBUG && toplev)
2634 dwarf2out_decl (TYPE_STUB_DECL (type));
2636 timevar_pop (TV_SYMOUT);
2639 /* DECL is an inline function, whose body is present, but which is not
2640 being output at this point. (We're putting that off until we need
2641 to do it.) If there are any actions that need to take place,
2642 including the emission of debugging information for the function,
2643 this is where they should go. This function may be called by
2644 language-dependent code for front-ends that do not even generate
2645 RTL for functions that don't need to be put out. */
2648 note_deferral_of_defined_inline_function (decl)
2649 tree decl ATTRIBUTE_UNUSED;
2651 #ifdef DWARF_DEBUGGING_INFO
2652 /* Generate the DWARF info for the "abstract" instance of a function
2653 which we may later generate inlined and/or out-of-line instances
2655 if (write_symbols == DWARF_DEBUG
2656 && (DECL_INLINE (decl) || DECL_ABSTRACT (decl))
2657 && ! DECL_ABSTRACT_ORIGIN (decl))
2659 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2660 DWARF code expects it to be set in this case. Intuitively,
2661 DECL is the function we just finished defining, so setting
2662 CURRENT_FUNCTION_DECL is sensible. */
2663 tree saved_cfd = current_function_decl;
2664 int was_abstract = DECL_ABSTRACT (decl);
2665 current_function_decl = decl;
2667 /* Let the DWARF code do its work. */
2668 set_decl_abstract_flags (decl, 1);
2669 dwarfout_file_scope_decl (decl, 0);
2671 set_decl_abstract_flags (decl, 0);
2673 /* Reset CURRENT_FUNCTION_DECL. */
2674 current_function_decl = saved_cfd;
2679 /* FNDECL is an inline function which is about to be emitted out of line.
2680 Do any preparation, such as emitting abstract debug info for the inline
2681 before it gets mangled by optimization. */
2684 note_outlining_of_inline_function (fndecl)
2685 tree fndecl ATTRIBUTE_UNUSED;
2687 #ifdef DWARF2_DEBUGGING_INFO
2688 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2689 the abstract description of inline functions until something tries to
2690 reference them. Force it out now, before optimizations mangle the
2692 if (write_symbols == DWARF2_DEBUG)
2693 dwarf2out_abstract_function (fndecl);
2697 /* This is called from finish_function (within yyparse)
2698 after each top-level definition is parsed.
2699 It is supposed to compile that function or variable
2700 and output the assembler code for it.
2701 After we return, the tree storage is freed. */
2704 rest_of_compilation (decl)
2710 int rebuild_label_notes_after_reload;
2711 int register_life_up_to_date;
2713 timevar_push (TV_REST_OF_COMPILATION);
2715 /* Now that we're out of the frontend, we shouldn't have any more
2716 CONCATs anywhere. */
2717 generating_concat_p = 0;
2719 /* When processing delayed functions, prepare_function_start() won't
2720 have been run to re-initialize it. */
2721 cse_not_expected = ! optimize;
2723 /* First, make sure that NOTE_BLOCK is set correctly for each
2724 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2725 if (!cfun->x_whole_function_mode_p)
2728 /* Then remove any notes we don't need. That will make iterating
2729 over the instruction sequence faster, and allow the garbage
2730 collector to reclaim the memory used by the notes. */
2731 remove_unnecessary_notes ();
2733 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2734 tree in sensible shape. So, we just recalculate it here. */
2735 if (cfun->x_whole_function_mode_p)
2740 /* If we are reconsidering an inline function
2741 at the end of compilation, skip the stuff for making it inline. */
2743 if (DECL_SAVED_INSNS (decl) == 0)
2749 /* If this is nested inside an inlined external function, pretend
2750 it was only declared. Since we cannot inline such functions,
2751 generating code for this one is not only not necessary but will
2752 confuse some debugging output writers. */
2753 for (parent = DECL_CONTEXT (current_function_decl);
2754 parent != NULL_TREE;
2755 parent = get_containing_scope (parent))
2756 if (TREE_CODE (parent) == FUNCTION_DECL
2757 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2759 DECL_INITIAL (decl) = 0;
2760 goto exit_rest_of_compilation;
2763 /* If requested, consider whether to make this function inline. */
2764 if ((DECL_INLINE (decl) && !flag_no_inline)
2765 || flag_inline_functions)
2767 timevar_push (TV_INTEGRATION);
2768 lose = function_cannot_inline_p (decl);
2769 timevar_pop (TV_INTEGRATION);
2770 if (lose || ! optimize)
2772 if (warn_inline && DECL_INLINE (decl))
2773 warning_with_decl (decl, lose);
2774 DECL_ABSTRACT_ORIGIN (decl) = 0;
2775 /* Don't really compile an extern inline function.
2776 If we can't make it inline, pretend
2777 it was only declared. */
2778 if (DECL_EXTERNAL (decl))
2780 DECL_INITIAL (decl) = 0;
2781 goto exit_rest_of_compilation;
2785 /* ??? Note that this has the effect of making it look
2786 like "inline" was specified for a function if we choose
2787 to inline it. This isn't quite right, but it's
2788 probably not worth the trouble to fix. */
2789 inlinable = DECL_INLINE (decl) = 1;
2792 insns = get_insns ();
2794 /* Dump the rtl code if we are dumping rtl. */
2796 if (open_dump_file (DFI_rtl, decl))
2798 if (DECL_SAVED_INSNS (decl))
2799 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2800 close_dump_file (DFI_rtl, print_rtl, insns);
2803 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2804 sorts of eh initialization. Delay this until after the
2805 initial rtl dump so that we can see the original nesting. */
2806 convert_from_eh_region_ranges ();
2808 /* If function is inline, and we don't yet know whether to
2809 compile it by itself, defer decision till end of compilation.
2810 finish_compilation will call rest_of_compilation again
2811 for those functions that need to be output. Also defer those
2812 functions that we are supposed to defer. */
2815 || (DECL_INLINE (decl)
2816 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2817 && ! flag_keep_inline_functions)
2818 || DECL_EXTERNAL (decl))))
2819 DECL_DEFER_OUTPUT (decl) = 1;
2821 if (DECL_INLINE (decl))
2822 /* DWARF wants seperate debugging info for abstract and
2823 concrete instances of all inline functions, including those
2824 declared inline but not inlined, and those inlined even
2825 though they weren't declared inline. Conveniently, that's
2826 what DECL_INLINE means at this point. */
2827 note_deferral_of_defined_inline_function (decl);
2829 if (DECL_DEFER_OUTPUT (decl))
2831 /* If -Wreturn-type, we have to do a bit of compilation. We just
2832 want to call jump_optimize to figure out whether or not we can
2833 fall off the end of the function; we do the minimum amount of
2834 work necessary to make that safe. And, we set optimize to zero
2835 to keep jump_optimize from working too hard. */
2836 if (warn_return_type)
2838 int saved_optimize = optimize;
2841 find_exception_handler_labels ();
2842 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
2843 !JUMP_AFTER_REGSCAN);
2844 optimize = saved_optimize;
2847 current_function_nothrow = nothrow_function_p ();
2848 if (current_function_nothrow)
2849 /* Now we know that this can't throw; set the flag for the benefit
2850 of other functions later in this translation unit. */
2851 TREE_NOTHROW (current_function_decl) = 1;
2853 timevar_push (TV_INTEGRATION);
2854 save_for_inline (decl);
2855 timevar_pop (TV_INTEGRATION);
2856 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2857 goto exit_rest_of_compilation;
2860 /* If specified extern inline but we aren't inlining it, we are
2861 done. This goes for anything that gets here with DECL_EXTERNAL
2862 set, not just things with DECL_INLINE. */
2863 if (DECL_EXTERNAL (decl))
2864 goto exit_rest_of_compilation;
2869 /* Initialize some variables used by the optimizers. */
2870 init_function_for_compilation ();
2872 if (! DECL_DEFER_OUTPUT (decl))
2873 TREE_ASM_WRITTEN (decl) = 1;
2875 /* Now that integrate will no longer see our rtl, we need not
2876 distinguish between the return value of this function and the
2877 return value of called functions. Also, we can remove all SETs
2878 of subregs of hard registers; they are only here because of
2879 integrate. Also, we can now initialize pseudos intended to
2880 carry magic hard reg data throughout the function. */
2881 rtx_equal_function_value_matters = 0;
2882 purge_hard_subreg_sets (get_insns ());
2883 emit_initial_value_sets ();
2885 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2886 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2887 goto exit_rest_of_compilation;
2889 /* We may have potential sibling or tail recursion sites. Select one
2890 (of possibly multiple) methods of performing the call. */
2891 if (flag_optimize_sibling_calls)
2893 timevar_push (TV_JUMP);
2894 open_dump_file (DFI_sibling, decl);
2896 optimize_sibling_and_tail_recursive_calls ();
2898 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2899 timevar_pop (TV_JUMP);
2902 /* Complete generation of exception handling code. */
2903 find_exception_handler_labels ();
2906 timevar_push (TV_JUMP);
2907 open_dump_file (DFI_eh, decl);
2909 finish_eh_generation ();
2911 close_dump_file (DFI_eh, print_rtl, get_insns ());
2912 timevar_pop (TV_JUMP);
2916 /* If we are doing position-independent code generation, now
2917 is the time to output special prologues and epilogues.
2918 We do not want to do this earlier, because it just clutters
2919 up inline functions with meaningless insns. */
2924 insns = get_insns ();
2926 /* Copy any shared structure that should not be shared. */
2927 unshare_all_rtl (current_function_decl, insns);
2929 #ifdef SETJMP_VIA_SAVE_AREA
2930 /* This must be performed before virutal register instantiation. */
2931 if (current_function_calls_alloca)
2932 optimize_save_area_alloca (insns);
2935 /* Instantiate all virtual registers. */
2936 instantiate_virtual_regs (current_function_decl, insns);
2938 open_dump_file (DFI_jump, decl);
2940 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2941 are initialized and to compute whether control can drop off the end
2944 timevar_push (TV_JUMP);
2945 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2946 before jump optimization switches branch directions. */
2947 expected_value_to_br_prob ();
2949 reg_scan (insns, max_reg_num (), 0);
2950 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
2951 JUMP_AFTER_REGSCAN);
2953 timevar_pop (TV_JUMP);
2955 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2956 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2958 close_dump_file (DFI_jump, print_rtl, insns);
2959 goto exit_rest_of_compilation;
2962 /* Long term, this should probably move before the jump optimizer too,
2963 but I didn't want to disturb the rtl_dump_and_exit and related
2964 stuff at this time. */
2965 if (optimize > 0 && flag_ssa)
2967 /* Convert to SSA form. */
2969 timevar_push (TV_TO_SSA);
2970 open_dump_file (DFI_ssa, decl);
2972 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2973 cleanup_cfg (CLEANUP_EXPENSIVE);
2976 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2977 timevar_pop (TV_TO_SSA);
2979 /* Perform sparse conditional constant propagation, if requested. */
2982 timevar_push (TV_SSA_CCP);
2983 open_dump_file (DFI_ssa_ccp, decl);
2987 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2988 timevar_pop (TV_SSA_CCP);
2991 /* It would be useful to cleanup the CFG at this point, but block
2992 merging and possibly other transformations might leave a PHI
2993 node in the middle of a basic block, which is a strict no-no. */
2995 /* The SSA implementation uses basic block numbers in its phi
2996 nodes. Thus, changing the control-flow graph or the basic
2997 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2998 may cause problems. */
3002 /* Remove dead code. */
3004 timevar_push (TV_SSA_DCE);
3005 open_dump_file (DFI_ssa_dce, decl);
3007 insns = get_insns ();
3008 ssa_eliminate_dead_code();
3010 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
3011 timevar_pop (TV_SSA_DCE);
3014 /* Convert from SSA form. */
3016 timevar_push (TV_FROM_SSA);
3017 open_dump_file (DFI_ussa, decl);
3019 convert_from_ssa ();
3020 /* New registers have been created. Rescan their usage. */
3021 reg_scan (insns, max_reg_num (), 1);
3022 /* Life analysis used in SSA adds log_links but these
3023 shouldn't be there until the flow stage, so clear
3025 clear_log_links (insns);
3027 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
3028 timevar_pop (TV_FROM_SSA);
3033 timevar_push (TV_JUMP);
3037 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3038 cleanup_cfg (CLEANUP_EXPENSIVE);
3040 /* ??? Run if-conversion before delete_null_pointer_checks,
3041 since the later does not preserve the CFG. This should
3042 be changed -- no since converting if's that are going to
3044 timevar_push (TV_IFCVT);
3046 timevar_pop (TV_IFCVT);
3048 /* Try to identify useless null pointer tests and delete them. */
3049 if (flag_delete_null_pointer_checks)
3050 delete_null_pointer_checks (insns);
3053 /* Jump optimization, and the removal of NULL pointer checks, may
3054 have reduced the number of instructions substantially. CSE, and
3055 future passes, allocate arrays whose dimensions involve the
3056 maximum instruction UID, so if we can reduce the maximum UID
3057 we'll save big on memory. */
3058 renumber_insns (rtl_dump_file);
3059 timevar_pop (TV_JUMP);
3061 close_dump_file (DFI_jump, print_rtl, insns);
3065 /* Perform common subexpression elimination.
3066 Nonzero value from `cse_main' means that jumps were simplified
3067 and some code may now be unreachable, so do
3068 jump optimization again. */
3072 open_dump_file (DFI_cse, decl);
3073 timevar_push (TV_CSE);
3075 reg_scan (insns, max_reg_num (), 1);
3077 if (flag_thread_jumps)
3079 timevar_push (TV_JUMP);
3080 thread_jumps (insns, max_reg_num (), 1);
3081 timevar_pop (TV_JUMP);
3084 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3086 /* If we are not running more CSE passes, then we are no longer
3087 expecting CSE to be run. But always rerun it in a cheap mode. */
3088 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
3090 if (tem || optimize > 1)
3092 timevar_push (TV_JUMP);
3093 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
3094 !JUMP_AFTER_REGSCAN);
3095 timevar_pop (TV_JUMP);
3098 /* Run this after jump optmizations remove all the unreachable code
3099 so that unreachable code will not keep values live. */
3100 delete_trivially_dead_insns (insns, max_reg_num ());
3102 /* Try to identify useless null pointer tests and delete them. */
3103 if (flag_delete_null_pointer_checks)
3105 timevar_push (TV_JUMP);
3106 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3108 cleanup_cfg (CLEANUP_EXPENSIVE);
3110 delete_null_pointer_checks (insns);
3111 timevar_pop (TV_JUMP);
3114 /* The second pass of jump optimization is likely to have
3115 removed a bunch more instructions. */
3116 renumber_insns (rtl_dump_file);
3118 timevar_pop (TV_CSE);
3119 close_dump_file (DFI_cse, print_rtl, insns);
3122 open_dump_file (DFI_addressof, decl);
3124 purge_addressof (insns);
3125 reg_scan (insns, max_reg_num (), 1);
3127 close_dump_file (DFI_addressof, print_rtl, insns);
3131 /* Perform global cse. */
3133 if (optimize > 0 && flag_gcse)
3135 int save_csb, save_cfj;
3138 timevar_push (TV_GCSE);
3139 open_dump_file (DFI_gcse, decl);
3141 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3142 cleanup_cfg (CLEANUP_EXPENSIVE);
3143 tem = gcse_main (insns, rtl_dump_file);
3145 save_csb = flag_cse_skip_blocks;
3146 save_cfj = flag_cse_follow_jumps;
3147 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
3149 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3151 if (flag_expensive_optimizations)
3153 timevar_push (TV_CSE);
3154 reg_scan (insns, max_reg_num (), 1);
3155 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3156 timevar_pop (TV_CSE);
3157 cse_not_expected = !flag_rerun_cse_after_loop;
3160 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3161 things up. Then possibly re-run CSE again. */
3165 timevar_push (TV_JUMP);
3166 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
3167 !JUMP_AFTER_REGSCAN);
3168 timevar_pop (TV_JUMP);
3170 if (flag_expensive_optimizations)
3172 timevar_push (TV_CSE);
3173 reg_scan (insns, max_reg_num (), 1);
3174 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3175 timevar_pop (TV_CSE);
3179 close_dump_file (DFI_gcse, print_rtl, insns);
3180 timevar_pop (TV_GCSE);
3183 flag_cse_skip_blocks = save_csb;
3184 flag_cse_follow_jumps = save_cfj;
3187 /* Move constant computations out of loops. */
3191 timevar_push (TV_LOOP);
3192 open_dump_file (DFI_loop, decl);
3194 if (flag_rerun_loop_opt)
3196 /* We only want to perform unrolling once. */
3198 loop_optimize (insns, rtl_dump_file, 0);
3200 /* The first call to loop_optimize makes some instructions
3201 trivially dead. We delete those instructions now in the
3202 hope that doing so will make the heuristics in loop work
3203 better and possibly speed up compilation. */
3204 delete_trivially_dead_insns (insns, max_reg_num ());
3206 /* The regscan pass is currently necessary as the alias
3207 analysis code depends on this information. */
3208 reg_scan (insns, max_reg_num (), 1);
3210 loop_optimize (insns, rtl_dump_file,
3211 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT);
3213 close_dump_file (DFI_loop, print_rtl, insns);
3214 timevar_pop (TV_LOOP);
3221 timevar_push (TV_CSE2);
3222 open_dump_file (DFI_cse2, decl);
3224 if (flag_rerun_cse_after_loop)
3226 /* Running another jump optimization pass before the second
3227 cse pass sometimes simplifies the RTL enough to allow
3228 the second CSE pass to do a better job. Jump_optimize can change
3229 max_reg_num so we must rerun reg_scan afterwards.
3230 ??? Rework to not call reg_scan so often. */
3231 timevar_push (TV_JUMP);
3233 /* The previous call to loop_optimize makes some instructions
3234 trivially dead. We delete those instructions now in the
3235 hope that doing so will make the heuristics in jump work
3236 better and possibly speed up compilation. */
3237 delete_trivially_dead_insns (insns, max_reg_num ());
3239 reg_scan (insns, max_reg_num (), 0);
3240 jump_optimize (insns, !JUMP_CROSS_JUMP,
3241 !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN);
3243 timevar_push (TV_IFCVT);
3245 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3246 cleanup_cfg (CLEANUP_EXPENSIVE);
3249 timevar_pop(TV_IFCVT);
3251 timevar_pop (TV_JUMP);
3253 reg_scan (insns, max_reg_num (), 0);
3254 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3258 timevar_push (TV_JUMP);
3259 jump_optimize (insns, !JUMP_CROSS_JUMP,
3260 !JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3261 timevar_pop (TV_JUMP);
3265 if (flag_thread_jumps)
3267 /* This pass of jump threading straightens out code
3268 that was kinked by loop optimization. */
3269 timevar_push (TV_JUMP);
3270 reg_scan (insns, max_reg_num (), 0);
3271 thread_jumps (insns, max_reg_num (), 0);
3272 timevar_pop (TV_JUMP);
3275 close_dump_file (DFI_cse2, print_rtl, insns);
3276 timevar_pop (TV_CSE2);
3281 cse_not_expected = 1;
3285 /* Do control and data flow analysis; wrote some of the results to
3288 timevar_push (TV_FLOW);
3289 open_dump_file (DFI_cfg, decl);
3291 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3292 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3293 check_function_return_warnings ();
3295 /* It may make more sense to mark constant functions after dead code is
3296 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
3297 may insert code making function non-constant, but we still must consider
3298 it as constant, otherwise -fbranch-probabilities will not read data back.
3300 life_analyzis rarely eliminates modification of external memory.
3302 mark_constant_function ();
3304 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3306 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3308 timevar_push (TV_BRANCH_PROB);
3309 open_dump_file (DFI_bp, decl);
3313 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3314 timevar_pop (TV_BRANCH_PROB);
3317 open_dump_file (DFI_life, decl);
3322 /* Discover and record the loop depth at the head of each basic
3323 block. The loop infrastructure does the real job for us. */
3324 flow_loops_find (&loops, LOOP_TREE);
3326 /* Estimate using heuristics if no profiling info is available. */
3327 if (flag_guess_branch_prob)
3328 estimate_probability (&loops);
3331 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3333 flow_loops_free (&loops);
3335 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3336 timevar_pop (TV_FLOW);
3338 register_life_up_to_date = 1;
3341 if (warn_uninitialized || extra_warnings)
3343 uninitialized_vars_warning (DECL_INITIAL (decl));
3345 setjmp_args_warning ();
3348 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3352 /* If -opt, try combining insns through substitution. */
3356 int rebuild_jump_labels_after_combine = 0;
3358 timevar_push (TV_COMBINE);
3359 open_dump_file (DFI_combine, decl);
3361 rebuild_jump_labels_after_combine
3362 = combine_instructions (insns, max_reg_num ());
3364 /* Combining insns may have turned an indirect jump into a
3365 direct jump. Rebuid the JUMP_LABEL fields of jumping
3367 if (rebuild_jump_labels_after_combine)
3369 timevar_push (TV_JUMP);
3370 rebuild_jump_labels (insns);
3371 timevar_pop (TV_JUMP);
3373 timevar_push (TV_FLOW);
3374 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3375 cleanup_cfg (CLEANUP_EXPENSIVE);
3377 /* Blimey. We've got to have the CFG up to date for the call to
3378 if_convert below. However, the random deletion of blocks
3379 without updating life info can wind up with Wierd Stuff in
3380 global_live_at_end. We then run sched1, which updates things
3381 properly, discovers the wierdness and aborts. */
3382 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3383 PROP_DEATH_NOTES | PROP_KILL_DEAD_CODE
3384 | PROP_SCAN_DEAD_CODE);
3386 timevar_pop (TV_FLOW);
3389 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3390 timevar_pop (TV_COMBINE);
3395 /* Rerun if-conversion, as combine may have simplified things enough to
3396 now meet sequence length restrictions. */
3399 timevar_push (TV_IFCVT);
3400 open_dump_file (DFI_ce, decl);
3406 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3407 timevar_pop (TV_IFCVT);
3410 /* Register allocation pre-pass, to reduce number of moves
3411 necessary for two-address machines. */
3412 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3414 timevar_push (TV_REGMOVE);
3415 open_dump_file (DFI_regmove, decl);
3417 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3419 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3420 timevar_pop (TV_REGMOVE);
3425 /* Any of the several passes since flow1 will have munged register
3426 lifetime data a bit. */
3428 register_life_up_to_date = 0;
3430 #ifdef OPTIMIZE_MODE_SWITCHING
3431 timevar_push (TV_GCSE);
3433 if (optimize_mode_switching (NULL))
3435 /* We did work, and so had to regenerate global life information.
3436 Take advantage of this and don't re-recompute register life
3437 information below. */
3438 register_life_up_to_date = 1;
3441 timevar_pop (TV_GCSE);
3444 timevar_push (TV_SCHED);
3446 split_all_insns (1);
3448 #ifdef INSN_SCHEDULING
3450 /* Print function header into sched dump now
3451 because doing the sched analysis makes some of the dump. */
3452 if (optimize > 0 && flag_schedule_insns)
3454 open_dump_file (DFI_sched, decl);
3456 /* Do control and data sched analysis,
3457 and write some of the results to dump file. */
3459 schedule_insns (rtl_dump_file);
3461 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3463 /* Register lifetime information was updated as part of verifying
3465 register_life_up_to_date = 1;
3468 timevar_pop (TV_SCHED);
3472 /* Determine if the current function is a leaf before running reload
3473 since this can impact optimizations done by the prologue and
3474 epilogue thus changing register elimination offsets. */
3475 current_function_is_leaf = leaf_function_p ();
3477 timevar_push (TV_LOCAL_ALLOC);
3478 open_dump_file (DFI_lreg, decl);
3480 /* Allocate pseudo-regs that are used only within 1 basic block.
3482 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3483 jump optimizer after register allocation and reloading are finished. */
3485 if (! register_life_up_to_date)
3486 recompute_reg_usage (insns, ! optimize_size);
3487 regclass (insns, max_reg_num (), rtl_dump_file);
3488 rebuild_label_notes_after_reload = local_alloc ();
3490 timevar_pop (TV_LOCAL_ALLOC);
3492 if (dump_file[DFI_lreg].enabled)
3494 timevar_push (TV_DUMP);
3496 dump_flow_info (rtl_dump_file);
3497 dump_local_alloc (rtl_dump_file);
3499 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3500 timevar_pop (TV_DUMP);
3505 timevar_push (TV_GLOBAL_ALLOC);
3506 open_dump_file (DFI_greg, decl);
3508 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3509 pass fixing up any insns that are invalid. */
3512 failure = global_alloc (rtl_dump_file);
3515 build_insn_chain (insns);
3516 failure = reload (insns, 0);
3519 timevar_pop (TV_GLOBAL_ALLOC);
3521 if (dump_file[DFI_greg].enabled)
3523 timevar_push (TV_DUMP);
3525 dump_global_regs (rtl_dump_file);
3527 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3528 timevar_pop (TV_DUMP);
3532 goto exit_rest_of_compilation;
3536 open_dump_file (DFI_postreload, decl);
3538 /* Do a very simple CSE pass over just the hard registers. */
3541 timevar_push (TV_RELOAD_CSE_REGS);
3542 reload_cse_regs (insns);
3543 timevar_pop (TV_RELOAD_CSE_REGS);
3546 /* If optimizing, then go ahead and split insns now since we are about
3547 to recompute flow information anyway. */
3550 int old_labelnum = max_label_num ();
3552 split_all_insns (0);
3553 rebuild_label_notes_after_reload |= old_labelnum != max_label_num ();
3556 /* Register allocation and reloading may have turned an indirect jump into
3557 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3558 jumping instructions. */
3559 if (rebuild_label_notes_after_reload)
3561 timevar_push (TV_JUMP);
3563 rebuild_jump_labels (insns);
3565 timevar_pop (TV_JUMP);
3568 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3570 /* Re-create the death notes which were deleted during reload. */
3571 timevar_push (TV_FLOW2);
3572 open_dump_file (DFI_flow2, decl);
3574 jump_optimize (insns, !JUMP_CROSS_JUMP,
3575 JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3576 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3578 /* On some machines, the prologue and epilogue code, or parts thereof,
3579 can be represented as RTL. Doing so lets us schedule insns between
3580 it and the rest of the code and also allows delayed branch
3581 scheduling to operate in the epilogue. */
3582 thread_prologue_and_epilogue_insns (insns);
3586 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3587 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3589 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3590 even for machines with possibly nonzero RETURN_POPS_ARGS
3591 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3592 push instructions will have popping returns. */
3593 #ifndef PUSH_ROUNDING
3594 if (!ACCUMULATE_OUTGOING_ARGS)
3596 combine_stack_adjustments ();
3601 flow2_completed = 1;
3603 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3604 timevar_pop (TV_FLOW2);
3606 #ifdef HAVE_peephole2
3607 if (optimize > 0 && flag_peephole2)
3609 timevar_push (TV_PEEPHOLE2);
3610 open_dump_file (DFI_peephole2, decl);
3612 peephole2_optimize (rtl_dump_file);
3614 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3615 timevar_pop (TV_PEEPHOLE2);
3619 if (optimize > 0 && flag_rename_registers)
3621 timevar_push (TV_RENAME_REGISTERS);
3622 open_dump_file (DFI_rnreg, decl);
3624 regrename_optimize ();
3626 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3627 timevar_pop (TV_RENAME_REGISTERS);
3632 timevar_push (TV_IFCVT2);
3633 open_dump_file (DFI_ce2, decl);
3637 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3638 timevar_pop (TV_IFCVT2);
3641 #ifdef INSN_SCHEDULING
3642 if (optimize > 0 && flag_schedule_insns_after_reload)
3644 timevar_push (TV_SCHED2);
3645 open_dump_file (DFI_sched2, decl);
3647 /* Do control and data sched analysis again,
3648 and write some more of the results to dump file. */
3650 split_all_insns (1);
3652 schedule_insns (rtl_dump_file);
3654 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3655 timevar_pop (TV_SCHED2);
3661 #ifdef LEAF_REGISTERS
3662 current_function_uses_only_leaf_regs
3663 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3666 if (optimize > 0 && flag_reorder_blocks)
3668 timevar_push (TV_REORDER_BLOCKS);
3669 open_dump_file (DFI_bbro, decl);
3671 reorder_basic_blocks ();
3673 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3674 timevar_pop (TV_REORDER_BLOCKS);
3677 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3678 Also do cross-jumping this time and delete no-op move insns. */
3682 timevar_push (TV_JUMP);
3683 open_dump_file (DFI_jump2, decl);
3685 jump_optimize (insns, JUMP_CROSS_JUMP, JUMP_NOOP_MOVES,
3686 !JUMP_AFTER_REGSCAN);
3688 /* CFG no longer kept up to date. */
3690 close_dump_file (DFI_jump2, print_rtl, insns);
3691 timevar_pop (TV_JUMP);
3694 /* If a machine dependent reorganization is needed, call it. */
3695 #ifdef MACHINE_DEPENDENT_REORG
3696 open_dump_file (DFI_mach, decl);
3698 MACHINE_DEPENDENT_REORG (insns);
3700 close_dump_file (DFI_mach, print_rtl, insns);
3705 /* If a scheduling pass for delayed branches is to be done,
3706 call the scheduling code. */
3709 if (optimize > 0 && flag_delayed_branch)
3711 timevar_push (TV_DBR_SCHED);
3712 open_dump_file (DFI_dbr, decl);
3714 dbr_schedule (insns, rtl_dump_file);
3716 close_dump_file (DFI_dbr, print_rtl, insns);
3717 timevar_pop (TV_DBR_SCHED);
3723 timevar_push (TV_SHORTEN_BRANCH);
3725 #ifdef HAVE_ATTR_length
3732 split_all_insns (0);
3733 timevar_pop (TV_SHORTEN_BRANCH);
3736 timevar_push (TV_REG_STACK);
3737 open_dump_file (DFI_stack, decl);
3739 reg_to_stack (insns, rtl_dump_file);
3741 close_dump_file (DFI_stack, print_rtl, insns);
3742 timevar_pop (TV_REG_STACK);
3747 convert_to_eh_region_ranges ();
3749 /* Shorten branches. */
3750 timevar_push (TV_SHORTEN_BRANCH);
3751 shorten_branches (get_insns ());
3752 timevar_pop (TV_SHORTEN_BRANCH);
3754 current_function_nothrow = nothrow_function_p ();
3755 if (current_function_nothrow)
3756 /* Now we know that this can't throw; set the flag for the benefit
3757 of other functions later in this translation unit. */
3758 TREE_NOTHROW (current_function_decl) = 1;
3760 /* Now turn the rtl into assembler code. */
3762 timevar_push (TV_FINAL);
3767 /* Get the function's name, as described by its RTL. This may be
3768 different from the DECL_NAME name used in the source file. */
3770 x = DECL_RTL (decl);
3771 if (GET_CODE (x) != MEM)
3774 if (GET_CODE (x) != SYMBOL_REF)
3776 fnname = XSTR (x, 0);
3778 assemble_start_function (decl, fnname);
3779 final_start_function (insns, asm_out_file, optimize);
3780 final (insns, asm_out_file, optimize, 0);
3781 final_end_function (insns, asm_out_file, optimize);
3783 #ifdef IA64_UNWIND_INFO
3784 /* ??? The IA-64 ".handlerdata" directive must be issued before
3785 the ".endp" directive that closes the procedure descriptor. */
3786 output_function_exception_table ();
3789 assemble_end_function (decl, fnname);
3791 #ifndef IA64_UNWIND_INFO
3792 /* Otherwise, it feels unclean to switch sections in the middle. */
3793 output_function_exception_table ();
3797 fflush (asm_out_file);
3799 /* Release all memory allocated by flow. */
3800 free_basic_block_vars (0);
3802 /* Release all memory held by regsets now. */
3803 regset_release_memory ();
3805 timevar_pop (TV_FINAL);
3809 /* Write DBX symbols if requested. */
3811 /* Note that for those inline functions where we don't initially
3812 know for certain that we will be generating an out-of-line copy,
3813 the first invocation of this routine (rest_of_compilation) will
3814 skip over this code by doing a `goto exit_rest_of_compilation;'.
3815 Later on, finish_compilation will call rest_of_compilation again
3816 for those inline functions that need to have out-of-line copies
3817 generated. During that call, we *will* be routed past here. */
3819 timevar_push (TV_SYMOUT);
3820 #ifdef DBX_DEBUGGING_INFO
3821 if (write_symbols == DBX_DEBUG)
3822 dbxout_function (decl);
3825 #ifdef DWARF_DEBUGGING_INFO
3826 if (write_symbols == DWARF_DEBUG)
3827 dwarfout_file_scope_decl (decl, 0);
3830 #ifdef DWARF2_DEBUGGING_INFO
3831 if (write_symbols == DWARF2_DEBUG)
3832 dwarf2out_decl (decl);
3834 timevar_pop (TV_SYMOUT);
3836 exit_rest_of_compilation:
3838 /* In case the function was not output,
3839 don't leave any temporary anonymous types
3840 queued up for sdb output. */
3841 #ifdef SDB_DEBUGGING_INFO
3842 if (write_symbols == SDB_DEBUG)
3843 sdbout_types (NULL_TREE);
3846 reload_completed = 0;
3847 flow2_completed = 0;
3850 timevar_push (TV_FINAL);
3852 /* Clear out the insn_length contents now that they are no
3854 init_insn_lengths ();
3856 /* Clear out the real_constant_chain before some of the rtx's
3857 it runs through become garbage. */
3858 clear_const_double_mem ();
3860 /* Show no temporary slots allocated. */
3863 free_basic_block_vars (0);
3865 timevar_pop (TV_FINAL);
3867 /* Make sure volatile mem refs aren't considered valid operands for
3868 arithmetic insns. We must call this here if this is a nested inline
3869 function, since the above code leaves us in the init_recog state
3870 (from final.c), and the function context push/pop code does not
3871 save/restore volatile_ok.
3873 ??? Maybe it isn't necessary for expand_start_function to call this
3874 anymore if we do it here? */
3876 init_recog_no_volatile ();
3878 /* We're done with this function. Free up memory if we can. */
3879 free_after_parsing (cfun);
3880 if (! DECL_DEFER_OUTPUT (decl))
3881 free_after_compilation (cfun);
3886 timevar_pop (TV_REST_OF_COMPILATION);
3896 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3897 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3898 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3899 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3900 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3901 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"));
3903 for (i = ARRAY_SIZE (f_options); i--;)
3905 const char *description = f_options[i].description;
3907 if (description != NULL && * description != 0)
3908 printf (" -f%-21s %s\n",
3909 f_options[i].string, _(description));
3912 printf (_(" -O[number] Set optimisation level to [number]\n"));
3913 printf (_(" -Os Optimise for space rather than speed\n"));
3914 for (i = LAST_PARAM; i--;)
3916 const char *description = compiler_params[i].help;
3917 const int length = 21-strlen(compiler_params[i].option);
3919 if (description != NULL && * description != 0)
3920 printf (" --param %s=<value>%.*s%s\n",
3921 compiler_params[i].option,
3922 length > 0 ? length : 1, " ",
3925 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3926 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3927 printf (_(" -w Suppress warnings\n"));
3928 printf (_(" -W Enable extra warnings\n"));
3930 for (i = ARRAY_SIZE (W_options); i--;)
3932 const char *description = W_options[i].description;
3934 if (description != NULL && * description != 0)
3935 printf (" -W%-21s %s\n",
3936 W_options[i].string, _(description));
3939 printf (_(" -Wunused Enable unused warnings\n"));
3940 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3941 printf (_(" -p Enable function profiling\n"));
3942 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3943 printf (_(" -a Enable block profiling \n"));
3945 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3946 printf (_(" -ax Enable jump profiling \n"));
3948 printf (_(" -o <file> Place output into <file> \n"));
3950 -G <number> Put global and static data smaller than <number>\n\
3951 bytes into a special section (on some targets)\n"));
3953 for (i = ARRAY_SIZE (debug_args); i--;)
3955 if (debug_args[i].description != NULL)
3956 printf (" -g%-21s %s\n",
3957 debug_args[i].arg, _(debug_args[i].description));
3960 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3961 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3962 printf (_(" -version Display the compiler's version\n"));
3963 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3964 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3965 #if defined INSN_SCHEDULING
3966 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3968 printf (_(" --help Display this information\n"));
3973 /* Display descriptions of language specific options.
3974 If there is no description, note that there is an undocumented option.
3975 If the description is empty, do not display anything. (This allows
3976 options to be deliberately undocumented, for whatever reason).
3977 If the option string is missing, then this is a marker, indicating
3978 that the description string is in fact the name of a language, whose
3979 language specific options are to follow. */
3981 if (ARRAY_SIZE (documented_lang_options) > 1)
3983 printf (_("\nLanguage specific options:\n"));
3985 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3987 const char *description = documented_lang_options[i].description;
3988 const char *option = documented_lang_options[i].option;
3990 if (description == NULL)
3995 printf (_(" %-23.23s [undocumented]\n"), option);
3997 else if (*description == 0)
3999 else if (option == NULL)
4003 (_("\nThere are undocumented %s specific options as well.\n"),
4007 printf (_("\n Options for %s:\n"), description);
4012 printf (" %-23.23s %s\n", option, _(description));
4017 printf (_("\nThere are undocumented %s specific options as well.\n"),
4020 display_target_options ();
4024 display_target_options ()
4028 if (ARRAY_SIZE (target_switches) > 1
4029 #ifdef TARGET_OPTIONS
4030 || ARRAY_SIZE (target_options) > 1
4038 printf (_("\nTarget specific options:\n"));
4040 for (i = ARRAY_SIZE (target_switches); i--;)
4042 const char *option = target_switches[i].name;
4043 const char *description = target_switches[i].description;
4045 if (option == NULL || *option == 0)
4047 else if (description == NULL)
4052 printf (_(" -m%-23.23s [undocumented]\n"), option);
4054 else if (* description != 0)
4055 doc += printf (" -m%-23.23s %s\n", option, _(description));
4058 #ifdef TARGET_OPTIONS
4059 for (i = ARRAY_SIZE (target_options); i--;)
4061 const char *option = target_options[i].prefix;
4062 const char *description = target_options[i].description;
4064 if (option == NULL || *option == 0)
4066 else if (description == NULL)
4071 printf (_(" -m%-23.23s [undocumented]\n"), option);
4073 else if (* description != 0)
4074 doc += printf (" -m%-23.23s %s\n", option, _(description));
4080 printf (_("\nThere are undocumented target specific options as well.\n"));
4082 printf (_(" They exist, but they are not documented.\n"));
4087 /* Parse a -d... comand line switch. */
4090 decode_d_option (arg)
4099 for (i = 0; i < (int) DFI_MAX; ++i)
4100 dump_file[i].enabled = 1;
4106 flag_print_asm_name = 1;
4109 flag_dump_rtl_in_asm = 1;
4110 flag_print_asm_name = 1;
4113 graph_dump_format = vcg;
4116 rtl_dump_and_exit = 1;
4121 case 'D': /* These are handled by the preprocessor. */
4127 for (i = 0; i < (int) DFI_MAX; ++i)
4128 if (c == dump_file[i].debug_switch)
4130 dump_file[i].enabled = 1;
4135 warning ("unrecognized gcc debugging option: %c", c);
4140 /* Parse a -f... comand line switch. ARG is the value after the -f.
4141 It is safe to access 'ARG - 2' to generate the full switch name.
4142 Return the number of strings consumed. */
4145 decode_f_option (arg)
4149 const char *option_value = NULL;
4151 /* Search for the option in the table of binary f options. */
4152 for (j = ARRAY_SIZE (f_options); j--;)
4154 if (!strcmp (arg, f_options[j].string))
4156 *f_options[j].variable = f_options[j].on_value;
4160 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4161 && ! strcmp (arg + 3, f_options[j].string))
4163 *f_options[j].variable = ! f_options[j].on_value;
4168 if (!strcmp (arg, "fast-math"))
4169 set_fast_math_flags();
4170 else if (!strcmp (arg, "no-fast-math"))
4171 set_no_fast_math_flags();
4172 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4173 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4176 read_integral_parameter (option_value, arg - 2,
4178 set_param_value ("max-inline-insns", val);
4180 #ifdef INSN_SCHEDULING
4181 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4182 fix_sched_param ("verbose", option_value);
4184 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4185 fix_register (option_value, 1, 1);
4186 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4187 fix_register (option_value, 0, 1);
4188 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4189 fix_register (option_value, 0, 0);
4190 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4191 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4192 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4194 = read_integral_parameter (option_value, arg - 2, align_functions);
4195 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4196 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4197 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4199 = read_integral_parameter (option_value, arg - 2, align_labels);
4200 else if ((option_value
4201 = skip_leading_substring (arg, "stack-limit-register=")))
4203 int reg = decode_reg_name (option_value);
4205 error ("unrecognized register name `%s'", option_value);
4207 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4209 else if ((option_value
4210 = skip_leading_substring (arg, "stack-limit-symbol=")))
4213 nm = ggc_strdup (option_value);
4214 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4216 else if ((option_value
4217 = skip_leading_substring (arg, "message-length=")))
4218 output_set_maximum_length
4219 (&global_dc->buffer, read_integral_parameter
4220 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4221 else if ((option_value
4222 = skip_leading_substring (arg, "diagnostics-show-location=")))
4224 if (!strcmp (option_value, "once"))
4225 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4226 else if (!strcmp (option_value, "every-line"))
4227 diagnostic_prefixing_rule (global_dc)
4228 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4230 error ("Unrecognized option `%s'", arg - 2);
4232 else if (!strcmp (arg, "no-stack-limit"))
4233 stack_limit_rtx = NULL_RTX;
4234 else if (!strcmp (arg, "preprocessed"))
4235 /* Recognise this switch but do nothing. This prevents warnings
4236 about an unrecognized switch if cpplib has not been linked in. */
4244 /* Parse a -W... comand line switch. ARG is the value after the -W.
4245 It is safe to access 'ARG - 2' to generate the full switch name.
4246 Return the number of strings consumed. */
4249 decode_W_option (arg)
4252 const char *option_value = NULL;
4255 /* Search for the option in the table of binary W options. */
4257 for (j = ARRAY_SIZE (W_options); j--;)
4259 if (!strcmp (arg, W_options[j].string))
4261 *W_options[j].variable = W_options[j].on_value;
4265 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4266 && ! strcmp (arg + 3, W_options[j].string))
4268 *W_options[j].variable = ! W_options[j].on_value;
4273 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4274 warning ("-Wid-clash-LEN is no longer supported");
4275 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4277 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4279 warn_larger_than = larger_than_size != -1;
4281 else if (!strcmp (arg, "unused"))
4285 else if (!strcmp (arg, "no-unused"))
4295 /* Parse a -g... comand line switch. ARG is the value after the -g.
4296 It is safe to access 'ARG - 2' to generate the full switch name.
4297 Return the number of strings consumed. */
4300 decode_g_option (arg)
4303 static unsigned level=0;
4304 /* A lot of code assumes write_symbols == NO_DEBUG if the
4305 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4306 of what debugging type has been selected). This records the
4307 selected type. It is an error to specify more than one
4309 static enum debug_info_type selected_debug_type = NO_DEBUG;
4310 /* Non-zero if debugging format has been explicitly set.
4311 -g and -ggdb don't explicitly set the debugging format so
4312 -gdwarf -g3 is equivalent to -gdwarf3. */
4313 static int type_explicitly_set_p = 0;
4314 /* Indexed by enum debug_info_type. */
4315 static const char *debug_type_names[] =
4317 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4320 /* The maximum admissible debug level value. */
4321 static const unsigned max_debug_level = 3;
4323 /* Look up ARG in the table. */
4324 for (da = debug_args; da->arg; da++)
4326 const int da_len = strlen (da->arg);
4328 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4330 enum debug_info_type type = da->debug_type;
4331 const char *p = arg + da_len;
4333 if (*p && (*p < '0' || *p > '9'))
4336 /* A debug flag without a level defaults to level 2.
4337 Note we do not want to call read_integral_parameter
4338 for that case since it will call atoi which
4341 ??? We may want to generalize the interface to
4342 read_integral_parameter to better handle this case
4343 if this case shows up often. */
4345 level = read_integral_parameter (p, 0, max_debug_level + 1);
4347 level = (level == 0) ? 2 : level;
4349 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4351 error ("use -gdwarf -g%d for DWARF v1, level %d",
4354 error ("use -gdwarf-2 for DWARF v2");
4357 if (level > max_debug_level)
4360 ignoring option `%s' due to invalid debug level specification",
4362 level = debug_info_level;
4365 if (type == NO_DEBUG)
4367 type = PREFERRED_DEBUGGING_TYPE;
4369 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4371 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4372 type = DWARF2_DEBUG;
4374 #ifdef DBX_DEBUGGING_INFO
4381 if (type == NO_DEBUG)
4382 warning ("`%s': unknown or unsupported -g option", arg - 2);
4384 /* Does it conflict with an already selected type? */
4385 if (type_explicitly_set_p
4386 /* -g/-ggdb don't conflict with anything. */
4387 && da->debug_type != NO_DEBUG
4388 && type != selected_debug_type)
4389 warning ("`%s' ignored, conflicts with `-g%s'",
4390 arg - 2, debug_type_names[(int) selected_debug_type]);
4393 /* If the format has already been set, -g/-ggdb
4394 only change the debug level. */
4395 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4396 /* Don't change debugging type. */
4400 selected_debug_type = type;
4401 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4404 write_symbols = (level == 0
4406 : selected_debug_type);
4407 use_gnu_debug_info_extensions = da->use_extensions_p;
4408 debug_info_level = (enum debug_info_level) level;
4421 /* Decode the first argument in the argv as a language-independent option.
4422 Return the number of strings consumed. */
4425 independent_decode_option (argc, argv)
4429 char *arg = argv[0];
4431 if (arg[0] != '-' || arg[1] == 0)
4443 if (!strcmp (arg, "-help"))
4446 exit_after_options = 1;
4449 if (!strcmp (arg, "-target-help"))
4451 display_target_options ();
4452 exit_after_options = 1;
4455 if (!strcmp (arg, "-version"))
4457 print_version (stderr, "");
4458 exit_after_options = 1;
4461 /* Handle '--param <name>=<value>'. */
4462 if (strcmp (arg, "-param") == 0)
4468 error ("-param option missing argument");
4472 /* Get the '<name>=<value>' parameter. */
4474 /* Look for the `='. */
4475 equal = strchr (arg, '=');
4477 error ("invalid --param option: %s", arg);
4482 /* Zero out the `=' sign so that we get two separate strings. */
4484 /* Figure out what value is specified. */
4485 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4486 if (val != INVALID_PARAM_VAL)
4487 set_param_value (arg, val);
4489 error ("invalid parameter value `%s'", equal + 1);
4504 /* Already been treated in main (). Do nothing. */
4508 set_target_switch (arg + 1);
4512 return decode_f_option (arg + 1);
4515 return decode_g_option (arg + 1);
4518 if (!strcmp (arg, "dumpbase"))
4523 dump_base_name = argv[1];
4527 decode_d_option (arg + 1);
4531 if (!strcmp (arg, "pedantic"))
4533 else if (!strcmp (arg, "pedantic-errors"))
4534 flag_pedantic_errors = pedantic = 1;
4535 else if (arg[1] == 0)
4542 if (!strcmp (arg, "quiet"))
4549 if (!strcmp (arg, "version"))
4557 inhibit_warnings = 1;
4566 /* We save the value of warn_uninitialized, since if they put
4567 -Wuninitialized on the command line, we need to generate a
4568 warning about not using it without also specifying -O. */
4569 if (warn_uninitialized != 1)
4570 warn_uninitialized = 2;
4573 return decode_W_option (arg + 1);
4579 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4580 warning ("`-a' option (basic block profile) not supported");
4582 profile_block_flag = (profile_block_flag < 2) ? 1 : 3;
4585 else if (!strcmp (arg, "ax"))
4587 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4588 warning ("`-ax' option (jump profiling) not supported");
4590 profile_block_flag = (!profile_block_flag
4591 || profile_block_flag == 2) ? 2 : 3;
4594 else if (!strncmp (arg, "aux-info", 8))
4601 aux_info_file_name = argv[1];
4602 flag_gen_aux_info = 1;
4605 else if (arg[8] == '=')
4607 aux_info_file_name = arg + 9;
4608 flag_gen_aux_info = 1;
4623 asm_file_name = argv[1];
4638 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4643 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4647 if (g_switch_val == -1)
4651 g_switch_set = TRUE;
4652 g_switch_value = g_switch_val;
4662 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4663 Decode command args, then call compile_file.
4664 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4665 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4667 It is not safe to call this function more than once. */
4670 toplev_main (argc, argv)
4677 /* save in case md file wants to emit args as a comment. */
4681 p = argv[0] + strlen (argv[0]);
4682 while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
4686 xmalloc_set_program_name (progname);
4688 /* LC_CTYPE determines the character set used by the terminal so it has be set
4689 to output messages correctly. */
4691 #ifdef HAVE_LC_MESSAGES
4692 setlocale (LC_CTYPE, "");
4693 setlocale (LC_MESSAGES, "");
4695 setlocale (LC_ALL, "");
4698 (void) bindtextdomain (PACKAGE, localedir);
4699 (void) textdomain (PACKAGE);
4701 /* Install handler for SIGFPE, which may be received while we do
4702 compile-time floating point arithmetic. */
4703 signal (SIGFPE, float_signal);
4705 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4707 signal (SIGSEGV, crash_signal);
4710 signal (SIGILL, crash_signal);
4713 signal (SIGBUS, crash_signal);
4716 signal (SIGABRT, crash_signal);
4718 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4719 signal (SIGIOT, crash_signal);
4722 decl_printable_name = decl_name;
4723 lang_expand_expr = (lang_expand_expr_t) do_abort;
4725 /* Initialize whether `char' is signed. */
4726 flag_signed_char = DEFAULT_SIGNED_CHAR;
4727 #ifdef DEFAULT_SHORT_ENUMS
4728 /* Initialize how much space enums occupy, by default. */
4729 flag_short_enums = DEFAULT_SHORT_ENUMS;
4732 /* Initialize the garbage-collector. */
4735 ggc_add_rtx_root (&stack_limit_rtx, 1);
4736 ggc_add_tree_root (¤t_function_decl, 1);
4737 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4739 /* Initialize the diagnostics reporting machinery. */
4740 diagnostic_initialize (global_dc);
4742 /* Register the language-independent parameters. */
4743 add_params (lang_independent_params, LAST_PARAM);
4745 /* Perform language-specific options intialization. */
4746 if (lang_hooks.init_options)
4747 (*lang_hooks.init_options) ();
4749 /* Scan to see what optimization level has been specified. That will
4750 determine the default value of many flags. */
4751 for (i = 1; i < argc; i++)
4753 if (!strcmp (argv[i], "-O"))
4758 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4760 /* Handle -Os, -O2, -O3, -O69, ... */
4761 char *p = &argv[i][2];
4763 if ((p[0] == 's') && (p[1] == 0))
4767 /* Optimizing for size forces optimize to be 2. */
4772 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4773 if (optimize_val != -1)
4775 optimize = optimize_val;
4785 flag_thread_jumps = 1;
4787 flag_delayed_branch = 1;
4789 #ifdef CAN_DEBUG_WITHOUT_FP
4790 flag_omit_frame_pointer = 1;
4792 flag_guess_branch_prob = 1;
4797 flag_optimize_sibling_calls = 1;
4798 flag_cse_follow_jumps = 1;
4799 flag_cse_skip_blocks = 1;
4801 flag_expensive_optimizations = 1;
4802 flag_strength_reduce = 1;
4803 flag_rerun_cse_after_loop = 1;
4804 flag_rerun_loop_opt = 1;
4805 flag_caller_saves = 1;
4808 #ifdef INSN_SCHEDULING
4809 flag_schedule_insns = 1;
4810 flag_schedule_insns_after_reload = 1;
4813 flag_strict_aliasing = 1;
4814 flag_delete_null_pointer_checks = 1;
4815 flag_reorder_blocks = 1;
4820 flag_inline_functions = 1;
4821 flag_rename_registers = 1;
4824 if (optimize < 2 || optimize_size)
4829 align_functions = 1;
4832 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4835 set_target_switch ("");
4837 /* Unwind tables are always present in an ABI-conformant IA-64
4838 object file, so the default should be ON. */
4839 #ifdef IA64_UNWIND_INFO
4840 flag_unwind_tables = IA64_UNWIND_INFO;
4843 #ifdef OPTIMIZATION_OPTIONS
4844 /* Allow default optimizations to be specified on a per-machine basis. */
4845 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4848 /* Initialize register usage now so switches may override. */
4851 /* Perform normal command line switch decoding. */
4852 for (i = 1; i < argc;)
4855 int indep_processed;
4857 /* Give the language a chance to decode the option for itself. */
4858 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4860 if (lang_processed >= 0)
4861 /* Now see if the option also has a language independent meaning.
4862 Some options are both language specific and language independent,
4864 indep_processed = independent_decode_option (argc - i, argv + i);
4867 lang_processed = -lang_processed;
4868 indep_processed = 0;
4871 if (lang_processed || indep_processed)
4872 i += MAX (lang_processed, indep_processed);
4875 const char *option = NULL;
4876 const char *lang = NULL;
4879 /* It is possible that the command line switch is not valid for the
4880 current language, but it is valid for another language. In order
4881 to be compatible with previous versions of the compiler (which
4882 did not issue an error message in this case) we check for this
4883 possibility here. If we do find a match, then if extra_warnings
4884 is set we generate a warning message, otherwise we will just
4885 ignore the option. */
4886 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4888 option = documented_lang_options[j].option;
4891 lang = documented_lang_options[j].description;
4892 else if (! strncmp (argv[i], option, strlen (option)))
4896 if (j != ARRAY_SIZE (documented_lang_options))
4900 warning ("Ignoring command line option '%s'", argv[i]);
4903 ("(It is valid for %s but not the selected language)",
4907 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4908 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4910 error ("Unrecognized option `%s'", argv[i]);
4916 /* All command line options have been processed. */
4917 if (lang_hooks.post_options)
4918 (*lang_hooks.post_options) ();
4920 if (exit_after_options)
4923 /* Checker uses the frame pointer. */
4924 if (flag_check_memory_usage)
4925 flag_omit_frame_pointer = 0;
4929 /* Inlining does not work if not optimizing,
4930 so force it not to be done. */
4934 /* The c_decode_option function and decode_option hook set
4935 this to `2' if -Wall is used, so we can avoid giving out
4936 lots of errors for people who don't realize what -Wall does. */
4937 if (warn_uninitialized == 1)
4938 warning ("-Wuninitialized is not supported without -O");
4941 /* We do not currently support sibling-call optimization in the
4942 presence of exceptions. See PR2975 for a test-case that will
4943 fail if we try to combine both of these features. */
4944 if (flag_exceptions)
4945 flag_optimize_sibling_calls = 0;
4947 #ifdef OVERRIDE_OPTIONS
4948 /* Some machines may reject certain combinations of options. */
4952 /* Set up the align_*_log variables, defaulting them to 1 if they
4953 were still unset. */
4954 if (align_loops <= 0) align_loops = 1;
4955 align_loops_log = floor_log2 (align_loops * 2 - 1);
4956 if (align_jumps <= 0) align_jumps = 1;
4957 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4958 if (align_labels <= 0) align_labels = 1;
4959 align_labels_log = floor_log2 (align_labels * 2 - 1);
4960 if (align_functions <= 0) align_functions = 1;
4961 align_functions_log = floor_log2 (align_functions * 2 - 1);
4963 if (profile_block_flag == 3)
4965 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4966 profile_block_flag = 2;
4969 /* Unrolling all loops implies that standard loop unrolling must also
4971 if (flag_unroll_all_loops)
4972 flag_unroll_loops = 1;
4973 /* Loop unrolling requires that strength_reduction be on also. Silently
4974 turn on strength reduction here if it isn't already on. Also, the loop
4975 unrolling code assumes that cse will be run after loop, so that must
4976 be turned on also. */
4977 if (flag_unroll_loops)
4979 flag_strength_reduce = 1;
4980 flag_rerun_cse_after_loop = 1;
4983 /* Warn about options that are not supported on this machine. */
4984 #ifndef INSN_SCHEDULING
4985 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4986 warning ("instruction scheduling not supported on this target machine");
4989 if (flag_delayed_branch)
4990 warning ("this target machine does not have delayed branches");
4993 /* Some operating systems do not allow profiling without a frame
4995 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4997 && flag_omit_frame_pointer)
4999 error ("profiling does not work without a frame pointer");
5000 flag_omit_frame_pointer = 0;
5003 user_label_prefix = USER_LABEL_PREFIX;
5004 if (flag_leading_underscore != -1)
5006 /* If the default prefix is more complicated than "" or "_",
5007 issue a warning and ignore this option. */
5008 if (user_label_prefix[0] == 0 ||
5009 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5011 user_label_prefix = flag_leading_underscore ? "_" : "";
5014 warning ("-f%sleading-underscore not supported on this target machine",
5015 flag_leading_underscore ? "" : "no-");
5018 /* If we are in verbose mode, write out the version and maybe all the
5019 option flags in use. */
5022 print_version (stderr, "");
5024 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5027 compile_file (filename);
5030 return (FATAL_EXIT_CODE);
5032 return (FATAL_EXIT_CODE);
5033 return (SUCCESS_EXIT_CODE);
5036 /* Decode -m switches. */
5037 /* Decode the switch -mNAME. */
5040 set_target_switch (name)
5044 int valid_target_option = 0;
5046 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5047 if (!strcmp (target_switches[j].name, name))
5049 if (target_switches[j].value < 0)
5050 target_flags &= ~-target_switches[j].value;
5052 target_flags |= target_switches[j].value;
5053 valid_target_option = 1;
5056 #ifdef TARGET_OPTIONS
5057 if (!valid_target_option)
5058 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5060 int len = strlen (target_options[j].prefix);
5061 if (!strncmp (target_options[j].prefix, name, len))
5063 *target_options[j].variable = name + len;
5064 valid_target_option = 1;
5069 if (!valid_target_option)
5070 error ("Invalid option `%s'", name);
5073 /* Print version information to FILE.
5074 Each line begins with INDENT (for the case where FILE is the
5075 assembler output file). */
5078 print_version (file, indent)
5083 #define __VERSION__ "[?]"
5087 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5089 "%s%s%s version %s (%s) compiled by CC.\n"
5091 , indent, *indent != 0 ? " " : "",
5092 language_string, version_string, TARGET_NAME,
5093 indent, __VERSION__);
5096 /* Print an option value and return the adjusted position in the line.
5097 ??? We don't handle error returns from fprintf (disk full); presumably
5098 other code will catch a disk full though. */
5101 print_single_switch (file, pos, max, indent, sep, term, type, name)
5104 const char *indent, *sep, *term, *type, *name;
5106 /* The ultrix fprintf returns 0 on success, so compute the result we want
5107 here since we need it for the following test. */
5108 int len = strlen (sep) + strlen (type) + strlen (name);
5113 fprintf (file, "%s", term);
5118 fprintf (file, "%s", indent);
5119 pos = strlen (indent);
5121 fprintf (file, "%s%s%s", sep, type, name);
5126 /* Print active target switches to FILE.
5127 POS is the current cursor position and MAX is the size of a "line".
5128 Each line begins with INDENT and ends with TERM.
5129 Each switch is separated from the next by SEP. */
5132 print_switch_values (file, pos, max, indent, sep, term)
5135 const char *indent, *sep, *term;
5140 /* Print the options as passed. */
5142 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
5143 _("options passed: "), "");
5145 for (p = &save_argv[1]; *p != NULL; p++)
5149 if (strcmp (*p, "-o") == 0)
5155 if (strcmp (*p, "-quiet") == 0)
5157 if (strcmp (*p, "-version") == 0)
5162 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
5165 fprintf (file, "%s", term);
5167 /* Print the -f and -m options that have been enabled.
5168 We don't handle language specific options but printing argv
5171 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
5172 _("options enabled: "), "");
5174 for (j = 0; j < ARRAY_SIZE (f_options); j++)
5175 if (*f_options[j].variable == f_options[j].on_value)
5176 pos = print_single_switch (file, pos, max, indent, sep, term,
5177 "-f", f_options[j].string);
5179 /* Print target specific options. */
5181 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5182 if (target_switches[j].name[0] != '\0'
5183 && target_switches[j].value > 0
5184 && ((target_switches[j].value & target_flags)
5185 == target_switches[j].value))
5187 pos = print_single_switch (file, pos, max, indent, sep, term,
5188 "-m", target_switches[j].name);
5191 #ifdef TARGET_OPTIONS
5192 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5193 if (*target_options[j].variable != NULL)
5196 sprintf (prefix, "-m%s", target_options[j].prefix);
5197 pos = print_single_switch (file, pos, max, indent, sep, term,
5198 prefix, *target_options[j].variable);
5202 fprintf (file, "%s", term);
5205 /* Returns nonzero if it is appropriate not to emit any debugging
5206 information for BLOCK, because it doesn't contain any instructions.
5207 This may not be the case for blocks containing nested functions, since
5208 we may actually call such a function even though the BLOCK information
5212 debug_ignore_block (block)
5213 tree block ATTRIBUTE_UNUSED;
5215 /* Never delete the BLOCK for the outermost scope
5216 of the function; we can refer to names from
5217 that scope even if the block notes are messed up. */
5218 if (is_body_block (block))
5221 #ifdef DWARF2_DEBUGGING_INFO
5222 if (write_symbols == DWARF2_DEBUG)
5223 return dwarf2out_ignore_block (block);