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 #ifdef DWARF_DEBUGGING_INFO
71 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
72 #include "dwarf2out.h"
75 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
79 #ifdef SDB_DEBUGGING_INFO
83 #ifdef XCOFF_DEBUGGING_INFO
88 /* The extra parameters substantially improve the I/O performance. */
91 vms_fopen (fname, type)
95 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
96 fixed arguments, which matches ANSI's specification but not VAXCRTL's
97 pre-ANSI implementation. This hack circumvents the mismatch problem. */
98 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
101 return (*vmslib_fopen) (fname, type, "mbc=32",
102 "deq=64", "fop=tef", "shr=nil");
104 return (*vmslib_fopen) (fname, type, "mbc=32");
107 #define fopen vms_fopen
110 #ifndef DEFAULT_GDB_EXTENSIONS
111 #define DEFAULT_GDB_EXTENSIONS 1
114 /* If more than one debugging type is supported, you must define
115 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
117 This is one long line cause VAXC can't handle a \-newline. */
118 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
119 #ifndef PREFERRED_DEBUGGING_TYPE
120 You Lose! You must define PREFERRED_DEBUGGING_TYPE!
121 #endif /* no PREFERRED_DEBUGGING_TYPE */
122 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
123 so the following code needn't care. */
124 #ifdef DBX_DEBUGGING_INFO
125 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
127 #ifdef SDB_DEBUGGING_INFO
128 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
130 #ifdef DWARF_DEBUGGING_INFO
131 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
133 #ifdef DWARF2_DEBUGGING_INFO
134 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
136 #ifdef XCOFF_DEBUGGING_INFO
137 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
139 #endif /* More than one debugger format enabled. */
141 /* If still not defined, must have been because no debugging formats
143 #ifndef PREFERRED_DEBUGGING_TYPE
144 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
147 #if defined (HAVE_DECL_ENVIRON) && !HAVE_DECL_ENVIRON
148 extern char **environ;
151 /* Carry information from ASM_DECLARE_OBJECT_NAME
152 to ASM_FINISH_DECLARE_OBJECT. */
154 extern int size_directive_output;
155 extern tree last_assemble_variable_decl;
157 static void set_target_switch PARAMS ((const char *));
158 static const char *decl_name PARAMS ((tree, int));
160 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
161 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
162 #ifdef ASM_IDENTIFY_LANGUAGE
163 /* This might or might not be used in ASM_IDENTIFY_LANGUAGE. */
164 static void output_lang_identify PARAMS ((FILE *)) ATTRIBUTE_UNUSED;
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 /* Describes a dump file. */
231 struct dump_file_info
233 /* The unique extension to apply, e.g. ".jump". */
234 const char *const extension;
236 /* The -d<c> character that enables this dump file. */
237 char const debug_switch;
239 /* True if there is a corresponding graph dump file. */
240 char const graph_dump_p;
242 /* True if the user selected this dump. */
245 /* True if the files have been initialized (ie truncated). */
249 /* Enumerate the extant dump files. */
287 /* Describes all the dump files. Should be kept in order of the
288 pass and in sync with dump_file_index above.
290 Remaining -d letters:
296 struct dump_file_info dump_file[DFI_MAX] =
298 { "rtl", 'r', 0, 0, 0 },
299 { "sibling", 'i', 0, 0, 0 },
300 { "jump", 'j', 0, 0, 0 },
301 { "cse", 's', 0, 0, 0 },
302 { "addressof", 'F', 0, 0, 0 },
303 { "ssa", 'e', 1, 0, 0 },
304 { "dce", 'X', 1, 0, 0 },
305 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
306 { "gcse", 'G', 1, 0, 0 },
307 { "loop", 'L', 1, 0, 0 },
308 { "cse2", 't', 1, 0, 0 },
309 { "cfg", 'f', 1, 0, 0 },
310 { "bp", 'b', 1, 0, 0 },
311 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
312 { "combine", 'c', 1, 0, 0 },
313 { "ce", 'C', 1, 0, 0 },
314 { "regmove", 'N', 1, 0, 0 },
315 { "sched", 'S', 1, 0, 0 },
316 { "lreg", 'l', 1, 0, 0 },
317 { "greg", 'g', 1, 0, 0 },
318 { "postreload", 'o', 1, 0, 0 },
319 { "flow2", 'w', 1, 0, 0 },
320 { "peephole2", 'z', 1, 0, 0 },
321 { "rnreg", 'n', 1, 0, 0 },
322 { "ce2", 'E', 1, 0, 0 },
323 { "sched2", 'R', 1, 0, 0 },
324 { "bbro", 'B', 1, 0, 0 },
325 { "jump2", 'J', 1, 0, 0 },
326 { "mach", 'M', 1, 0, 0 },
327 { "dbr", 'd', 0, 0, 0 },
328 { "stack", 'k', 1, 0, 0 },
331 static int open_dump_file PARAMS ((enum dump_file_index, tree));
332 static void close_dump_file PARAMS ((enum dump_file_index,
333 void (*) (FILE *, rtx), rtx));
335 /* Other flags saying which kinds of debugging dump have been requested. */
337 int rtl_dump_and_exit;
338 int flag_print_asm_name;
339 static int flag_print_mem;
340 static int version_flag;
341 static char *filename;
342 enum graph_dump_types graph_dump_format;
344 /* Name for output file of assembly code, specified with -o. */
348 /* Value of the -G xx switch, and whether it was passed or not. */
352 /* Type(s) of debugging information we are producing (if any).
353 See flags.h for the definitions of the different possible
354 types of debugging information. */
355 enum debug_info_type write_symbols = NO_DEBUG;
357 /* Level of debugging information we are producing. See flags.h
358 for the definitions of the different possible levels. */
359 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
361 /* Nonzero means use GNU-only extensions in the generated symbolic
362 debugging information. */
363 /* Currently, this only has an effect when write_symbols is set to
364 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
365 int use_gnu_debug_info_extensions = 0;
367 /* Nonzero means do optimizations. -O.
368 Particular numeric values stand for particular amounts of optimization;
369 thus, -O2 stores 2 here. However, the optimizations beyond the basic
370 ones are not controlled directly by this variable. Instead, they are
371 controlled by individual `flag_...' variables that are defaulted
372 based on this variable. */
376 /* Nonzero means optimize for size. -Os.
377 The only valid values are zero and non-zero. When optimize_size is
378 non-zero, optimize defaults to 2, but certain individual code
379 bloating optimizations are disabled. */
381 int optimize_size = 0;
383 /* Number of error messages and warning messages so far. */
386 int warningcount = 0;
389 /* Nonzero if we should exit after parsing options. */
390 static int exit_after_options = 0;
392 /* The FUNCTION_DECL for the function currently being compiled,
393 or 0 if between functions. */
394 tree current_function_decl;
396 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
398 tree current_function_func_begin_label;
400 /* Pointer to function to compute the name to use to print a declaration.
401 DECL is the declaration in question.
402 VERBOSITY determines what information will be printed:
403 0: DECL_NAME, demangled as necessary.
404 1: and scope information.
405 2: and any other information that might be interesting, such as function
406 parameter types in C++. */
408 const char *(*decl_printable_name) PARAMS ((tree, int));
410 /* Pointer to function to compute rtl for a language-specific tree code. */
412 typedef rtx (*lang_expand_expr_t)
413 PARAMS ((union tree_node *, rtx, enum machine_mode,
414 enum expand_modifier modifier));
416 lang_expand_expr_t lang_expand_expr = 0;
418 tree (*lang_expand_constant) PARAMS ((tree)) = 0;
420 /* Pointer to function to finish handling an incomplete decl at the
421 end of compilation. */
423 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
425 /* Nonzero if doing dwarf2 duplicate elimination. */
427 int flag_eliminate_dwarf2_dups = 0;
429 /* Nonzero if generating code to do profiling. */
431 int profile_flag = 0;
433 /* Nonzero if generating code to do profiling on a line-by-line basis. */
435 int profile_block_flag;
437 /* Nonzero if generating code to profile program flow graph arcs. */
439 int profile_arc_flag = 0;
441 /* Nonzero if generating info for gcov to calculate line test coverage. */
443 int flag_test_coverage = 0;
445 /* Nonzero indicates that branch taken probabilities should be calculated. */
447 int flag_branch_probabilities = 0;
449 /* Nonzero if basic blocks should be reordered. */
451 int flag_reorder_blocks = 0;
453 /* Nonzero if registers should be renamed. */
455 int flag_rename_registers = 0;
457 /* Nonzero for -pedantic switch: warn about anything
458 that standard spec forbids. */
462 /* Temporarily suppress certain warnings.
463 This is set while reading code from a system header file. */
465 int in_system_header = 0;
467 /* Don't print functions as they are compiled. -quiet. */
471 /* Print times taken by the various passes. -ftime-report. */
475 /* Print memory still in use at end of compilation (which may have little
476 to do with peak memory consumption). -fmem-report. */
480 /* Non-zero means to collect statistics which might be expensive
481 and to print them when we are done. */
482 int flag_detailed_statistics = 0;
487 /* Nonzero means `char' should be signed. */
489 int flag_signed_char;
491 /* Nonzero means give an enum type only as many bytes as it needs. */
493 int flag_short_enums;
495 /* Nonzero for -fcaller-saves: allocate values in regs that need to
496 be saved across function calls, if that produces overall better code.
497 Optional now, so people can test it. */
499 #ifdef DEFAULT_CALLER_SAVES
500 int flag_caller_saves = 1;
502 int flag_caller_saves = 0;
505 /* Nonzero if structures and unions should be returned in memory.
507 This should only be defined if compatibility with another compiler or
508 with an ABI is needed, because it results in slower code. */
510 #ifndef DEFAULT_PCC_STRUCT_RETURN
511 #define DEFAULT_PCC_STRUCT_RETURN 1
514 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
516 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
518 /* Nonzero for -fforce-mem: load memory value into a register
519 before arithmetic on it. This makes better cse but slower compilation. */
521 int flag_force_mem = 0;
523 /* Nonzero for -fforce-addr: load memory address into a register before
524 reference to memory. This makes better cse but slower compilation. */
526 int flag_force_addr = 0;
528 /* Nonzero for -fdefer-pop: don't pop args after each function call;
529 instead save them up to pop many calls' args with one insns. */
531 int flag_defer_pop = 0;
533 /* Nonzero for -ffloat-store: don't allocate floats and doubles
534 in extended-precision registers. */
536 int flag_float_store = 0;
538 /* Nonzero for -fcse-follow-jumps:
539 have cse follow jumps to do a more extensive job. */
541 int flag_cse_follow_jumps;
543 /* Nonzero for -fcse-skip-blocks:
544 have cse follow a branch around a block. */
545 int flag_cse_skip_blocks;
547 /* Nonzero for -fexpensive-optimizations:
548 perform miscellaneous relatively-expensive optimizations. */
549 int flag_expensive_optimizations;
551 /* Nonzero for -fthread-jumps:
552 have jump optimize output of loop. */
554 int flag_thread_jumps;
556 /* Nonzero enables strength-reduction in loop.c. */
558 int flag_strength_reduce = 0;
560 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
561 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
562 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
565 int flag_unroll_loops;
567 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
568 This is generally not a win. */
570 int flag_unroll_all_loops;
572 /* Nonzero forces all invariant computations in loops to be moved
575 int flag_move_all_movables = 0;
577 /* Nonzero forces all general induction variables in loops to be
580 int flag_reduce_all_givs = 0;
582 /* Nonzero to perform full register move optimization passes. This is the
585 int flag_regmove = 0;
587 /* Nonzero for -fwritable-strings:
588 store string constants in data segment and don't uniquize them. */
590 int flag_writable_strings = 0;
592 /* Nonzero means don't put addresses of constant functions in registers.
593 Used for compiling the Unix kernel, where strange substitutions are
594 done on the assembly output. */
596 int flag_no_function_cse = 0;
598 /* Nonzero for -fomit-frame-pointer:
599 don't make a frame pointer in simple functions that don't require one. */
601 int flag_omit_frame_pointer = 0;
603 /* Nonzero means place each function into its own section on those platforms
604 which support arbitrary section names and unlimited numbers of sections. */
606 int flag_function_sections = 0;
608 /* ... and similar for data. */
610 int flag_data_sections = 0;
612 /* Nonzero to inhibit use of define_optimization peephole opts. */
614 int flag_no_peephole = 0;
616 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
618 int flag_optimize_sibling_calls = 0;
620 /* Nonzero means the front end generally wants `errno' maintained by math
621 operations, like built-in SQRT. */
623 int flag_errno_math = 1;
625 /* Nonzero means that unsafe floating-point math optimizations are allowed
626 for the sake of speed. IEEE compliance is not guaranteed, and operations
627 are allowed to assume that their arguments and results are "normal"
628 (e.g., nonnegative for SQRT). */
630 int flag_unsafe_math_optimizations = 0;
632 /* Zero means that floating-point math operations cannot generate a
633 (user-visible) trap. This is the case, for example, in nonstop
634 IEEE 754 arithmetic. */
636 int flag_trapping_math = 1;
638 /* 0 means straightforward implementation of complex divide acceptable.
639 1 means wide ranges of inputs must work for complex divide.
640 2 means C99-like requirements for complex divide (not yet implemented). */
642 int flag_complex_divide_method = 0;
644 /* Nonzero means all references through pointers are volatile. */
648 /* Nonzero means treat all global and extern variables as volatile. */
650 int flag_volatile_global;
652 /* Nonzero means treat all static variables as volatile. */
654 int flag_volatile_static;
656 /* Nonzero means just do syntax checking; don't output anything. */
658 int flag_syntax_only = 0;
660 /* Nonzero means perform global cse. */
662 static int flag_gcse;
664 /* Nonzero means to use global dataflow analysis to eliminate
665 useless null pointer tests. */
667 static int flag_delete_null_pointer_checks;
669 /* Nonzero means to rerun cse after loop optimization. This increases
670 compilation time about 20% and picks up a few more common expressions. */
672 static int flag_rerun_cse_after_loop;
674 /* Nonzero means to run loop optimizations twice. */
676 int flag_rerun_loop_opt;
678 /* Nonzero for -finline-functions: ok to inline functions that look like
679 good inline candidates. */
681 int flag_inline_functions;
683 /* Nonzero for -fkeep-inline-functions: even if we make a function
684 go inline everywhere, keep its definition around for debugging
687 int flag_keep_inline_functions;
689 /* Nonzero means that functions will not be inlined. */
693 /* Nonzero means that we should emit static const variables
694 regardless of whether or not optimization is turned on. */
696 int flag_keep_static_consts = 1;
698 /* Nonzero means we should be saving declaration info into a .X file. */
700 int flag_gen_aux_info = 0;
702 /* Specified name of aux-info file. */
704 static char *aux_info_file_name;
706 /* Nonzero means make the text shared if supported. */
708 int flag_shared_data;
710 /* Nonzero means schedule into delayed branch slots if supported. */
712 int flag_delayed_branch;
714 /* Nonzero if we are compiling pure (sharable) code.
715 Value is 1 if we are doing reasonable (i.e. simple
716 offset into offset table) pic. Value is 2 if we can
717 only perform register offsets. */
721 /* Nonzero means generate extra code for exception handling and enable
722 exception handling. */
726 /* Nonzero means use the new model for exception handling. Replaces
727 -DNEW_EH_MODEL as a compile option. */
729 int flag_new_exceptions = 1;
731 /* Nonzero means generate frame unwind info table when supported. */
733 int flag_unwind_tables = 0;
735 /* Nonzero means don't place uninitialized global data in common storage
740 /* Nonzero means pretend it is OK to examine bits of target floats,
741 even if that isn't true. The resulting code will have incorrect constants,
742 but the same series of instructions that the native compiler would make. */
744 int flag_pretend_float;
746 /* Nonzero means change certain warnings into errors.
747 Usually these are warnings about failure to conform to some standard. */
749 int flag_pedantic_errors = 0;
751 /* flag_schedule_insns means schedule insns within basic blocks (before
753 flag_schedule_insns_after_reload means schedule insns after
756 int flag_schedule_insns = 0;
757 int flag_schedule_insns_after_reload = 0;
759 /* The following flags have effect only for scheduling before register
762 flag_schedule_interblock means schedule insns accross basic blocks.
763 flag_schedule_speculative means allow speculative motion of non-load insns.
764 flag_schedule_speculative_load means allow speculative motion of some
766 flag_schedule_speculative_load_dangerous allows speculative motion of more
769 int flag_schedule_interblock = 1;
770 int flag_schedule_speculative = 1;
771 int flag_schedule_speculative_load = 0;
772 int flag_schedule_speculative_load_dangerous = 0;
774 int flag_single_precision_constant;
776 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
777 by a cheaper branch on a count register. */
778 int flag_branch_on_count_reg = 1;
780 /* -finhibit-size-directive inhibits output of .size for ELF.
781 This is used only for compiling crtstuff.c,
782 and it may be extended to other effects
783 needed for crtstuff.c on other systems. */
784 int flag_inhibit_size_directive = 0;
786 /* -fverbose-asm causes extra commentary information to be produced in
787 the generated assembly code (to make it more readable). This option
788 is generally only of use to those who actually need to read the
789 generated assembly code (perhaps while debugging the compiler itself).
790 -fno-verbose-asm, the default, causes the extra information
791 to be omitted and is useful when comparing two assembler files. */
793 int flag_verbose_asm = 0;
795 /* -dA causes debug commentary information to be produced in
796 the generated assembly code (to make it more readable). This option
797 is generally only of use to those who actually need to read the
798 generated assembly code (perhaps while debugging the compiler itself).
799 Currently, this switch is only used by dwarfout.c; however, it is intended
800 to be a catchall for printing debug information in the assembler file. */
802 int flag_debug_asm = 0;
804 /* -dP causes the rtl to be emitted as a comment in assembly. */
806 int flag_dump_rtl_in_asm = 0;
808 /* -fgnu-linker specifies use of the GNU linker for initializations.
809 (Or, more generally, a linker that handles initializations.)
810 -fno-gnu-linker says that collect2 will be used. */
812 int flag_gnu_linker = 0;
814 int flag_gnu_linker = 1;
820 /* Enable dead code elimination. */
823 /* Tag all structures with __attribute__(packed). */
824 int flag_pack_struct = 0;
826 /* Emit code to check for stack overflow; also may cause large objects
827 to be allocated dynamically. */
828 int flag_stack_check;
830 /* When non-NULL, indicates that whenever space is allocated on the
831 stack, the resulting stack pointer must not pass this
832 address---that is, for stacks that grow downward, the stack pointer
833 must always be greater than or equal to this address; for stacks
834 that grow upward, the stack pointer must be less than this address.
835 At present, the rtx may be either a REG or a SYMBOL_REF, although
836 the support provided depends on the backend. */
839 /* -fcheck-memory-usage causes extra code to be generated in order to check
840 memory accesses. This is used by a detector of bad memory accesses such
842 int flag_check_memory_usage = 0;
844 /* -fprefix-function-name causes function name to be prefixed. This
845 can be used with -fcheck-memory-usage to isolate code compiled with
846 -fcheck-memory-usage. */
847 int flag_prefix_function_name = 0;
849 /* 0 if pointer arguments may alias each other. True in C.
850 1 if pointer arguments may not alias each other but may alias
852 2 if pointer arguments may not alias each other and may not
853 alias global variables. True in Fortran.
854 This defaults to 0 for C. */
855 int flag_argument_noalias = 0;
857 /* Nonzero if we should do (language-dependent) alias analysis.
858 Typically, this analysis will assume that expressions of certain
859 types do not alias expressions of certain other types. Only used
860 if alias analysis (in general) is enabled. */
861 int flag_strict_aliasing = 0;
863 /* Instrument functions with calls at entry and exit, for profiling. */
864 int flag_instrument_function_entry_exit = 0;
866 /* Nonzero means ignore `#ident' directives. 0 means handle them.
867 On SVR4 targets, it also controls whether or not to emit a
868 string identifying the compiler. */
870 int flag_no_ident = 0;
872 /* This will perform a peephole pass before sched2. */
873 int flag_peephole2 = 0;
875 /* This will try to guess branch probabilities. */
876 int flag_guess_branch_prob = 0;
878 /* -fbounded-pointers causes gcc to compile pointers as composite
879 objects occupying three words: the pointer value, the base address
880 of the referent object, and the address immediately beyond the end
881 of the referent object. The base and extent allow us to perform
882 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
883 int flag_bounded_pointers = 0;
885 /* -fcheck-bounds causes gcc to generate array bounds checks.
886 For C, C++: defaults to value of flag_bounded_pointers.
887 For ObjC: defaults to off.
888 For Java: defaults to on.
889 For Fortran: defaults to off.
890 For CHILL: defaults to off. */
891 int flag_bounds_check = 0;
893 /* If one, renumber instruction UIDs to reduce the number of
894 unused UIDs if there are a lot of instructions. If greater than
895 one, unconditionally renumber instruction UIDs. */
896 int flag_renumber_insns = 1;
898 /* Values of the -falign-* flags: how much to align labels in code.
899 0 means `use default', 1 means `don't align'.
900 For each variable, there is an _log variant which is the power
901 of two not less than the variable, for .align output. */
908 int align_labels_log;
910 int align_functions_log;
912 /* Table of supported debugging formats. */
916 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
917 constant expression, we use NO_DEBUG in its place. */
918 enum debug_info_type debug_type;
919 int use_extensions_p;
920 const char *description;
924 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
925 "Generate default debug format output" },
926 { "gdb", NO_DEBUG, 1, "Generate default extended debug format output" },
927 #ifdef DBX_DEBUGGING_INFO
928 { "stabs", DBX_DEBUG, 0, "Generate STABS format debug output" },
929 { "stabs+", DBX_DEBUG, 1, "Generate extended STABS format debug output" },
931 #ifdef DWARF_DEBUGGING_INFO
932 { "dwarf", DWARF_DEBUG, 0, "Generate DWARF-1 format debug output"},
933 { "dwarf+", DWARF_DEBUG, 1,
934 "Generated extended DWARF-1 format debug output" },
936 #ifdef DWARF2_DEBUGGING_INFO
937 { "dwarf-2", DWARF2_DEBUG, 0, "Enable DWARF-2 debug output" },
939 #ifdef XCOFF_DEBUGGING_INFO
940 { "xcoff", XCOFF_DEBUG, 0, "Generate XCOFF format debug output" },
941 { "xcoff+", XCOFF_DEBUG, 1, "Generate extended XCOFF format debug output" },
943 #ifdef SDB_DEBUGGING_INFO
944 { "coff", SDB_DEBUG, 0, "Generate COFF format debug output" },
954 const char *description;
956 lang_independent_options;
960 /* Add or remove a leading underscore from user symbols. */
961 int flag_leading_underscore = -1;
963 /* The user symbol prefix after having resolved same. */
964 const char *user_label_prefix;
966 static const param_info lang_independent_params[] = {
967 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
969 #include "params.def"
974 /* A default for same. */
975 #ifndef USER_LABEL_PREFIX
976 #define USER_LABEL_PREFIX ""
979 /* Table of language-independent -f options.
980 STRING is the option name. VARIABLE is the address of the variable.
981 ON_VALUE is the value to store in VARIABLE
982 if `-fSTRING' is seen as an option.
983 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
985 lang_independent_options f_options[] =
987 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
988 "Perform DWARF2 duplicate elimination"},
989 {"float-store", &flag_float_store, 1,
990 "Do not store floats in registers" },
991 {"volatile", &flag_volatile, 1,
992 "Consider all mem refs through pointers as volatile"},
993 {"volatile-global", &flag_volatile_global, 1,
994 "Consider all mem refs to global data to be volatile" },
995 {"volatile-static", &flag_volatile_static, 1,
996 "Consider all mem refs to static data to be volatile" },
997 {"defer-pop", &flag_defer_pop, 1,
998 "Defer popping functions args from stack until later" },
999 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1000 "When possible do not generate stack frames"},
1001 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1002 "Optimize sibling and tail recursive calls" },
1003 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1004 "When running CSE, follow jumps to their targets" },
1005 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1006 "When running CSE, follow conditional jumps" },
1007 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1008 "Perform a number of minor, expensive optimisations" },
1009 {"thread-jumps", &flag_thread_jumps, 1,
1010 "Perform jump threading optimisations"},
1011 {"strength-reduce", &flag_strength_reduce, 1,
1012 "Perform strength reduction optimisations" },
1013 {"unroll-loops", &flag_unroll_loops, 1,
1014 "Perform loop unrolling when iteration count is known" },
1015 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1016 "Perform loop unrolling for all loops" },
1017 {"move-all-movables", &flag_move_all_movables, 1,
1018 "Force all loop invariant computations out of loops" },
1019 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1020 "Strength reduce all loop general induction variables" },
1021 {"writable-strings", &flag_writable_strings, 1,
1022 "Store strings in writable data section" },
1023 {"peephole", &flag_no_peephole, 0,
1024 "Enable machine specific peephole optimisations" },
1025 {"force-mem", &flag_force_mem, 1,
1026 "Copy memory operands into registers before using" },
1027 {"force-addr", &flag_force_addr, 1,
1028 "Copy memory address constants into regs before using" },
1029 {"function-cse", &flag_no_function_cse, 0,
1030 "Allow function addresses to be held in registers" },
1031 {"inline-functions", &flag_inline_functions, 1,
1032 "Integrate simple functions into their callers" },
1033 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1034 "Generate code for funcs even if they are fully inlined" },
1035 {"inline", &flag_no_inline, 0,
1036 "Pay attention to the 'inline' keyword"},
1037 {"keep-static-consts", &flag_keep_static_consts, 1,
1038 "Emit static const variables even if they are not used" },
1039 {"syntax-only", &flag_syntax_only, 1,
1040 "Check for syntax errors, then stop" },
1041 {"shared-data", &flag_shared_data, 1,
1042 "Mark data as shared rather than private" },
1043 {"caller-saves", &flag_caller_saves, 1,
1044 "Enable saving registers around function calls" },
1045 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1046 "Return 'short' aggregates in memory, not registers" },
1047 {"reg-struct-return", &flag_pcc_struct_return, 0,
1048 "Return 'short' aggregates in registers" },
1049 {"delayed-branch", &flag_delayed_branch, 1,
1050 "Attempt to fill delay slots of branch instructions" },
1051 {"gcse", &flag_gcse, 1,
1052 "Perform the global common subexpression elimination" },
1053 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1054 "Run CSE pass after loop optimisations"},
1055 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1056 "Run the loop optimiser twice"},
1057 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1058 "Delete useless null pointer checks" },
1059 {"pretend-float", &flag_pretend_float, 1,
1060 "Pretend that host and target use the same FP format"},
1061 {"schedule-insns", &flag_schedule_insns, 1,
1062 "Reschedule instructions before register allocation"},
1063 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1064 "Reschedule instructions after register allocation"},
1065 {"sched-interblock",&flag_schedule_interblock, 1,
1066 "Enable scheduling across basic blocks" },
1067 {"sched-spec",&flag_schedule_speculative, 1,
1068 "Allow speculative motion of non-loads" },
1069 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1070 "Allow speculative motion of some loads" },
1071 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1072 "Allow speculative motion of more loads" },
1073 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1074 "Replace add,compare,branch with branch on count reg"},
1075 {"pic", &flag_pic, 1,
1076 "Generate position independent code, if possible"},
1077 {"PIC", &flag_pic, 2, ""},
1078 {"exceptions", &flag_exceptions, 1,
1079 "Enable exception handling" },
1080 {"new-exceptions", &flag_new_exceptions, 1,
1081 "Use the new model for exception handling" },
1082 {"unwind-tables", &flag_unwind_tables, 1,
1083 "Just generate unwind tables for exception handling" },
1084 {"sjlj-exceptions", &exceptions_via_longjmp, 1,
1085 "Use setjmp/longjmp to handle exceptions" },
1086 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1087 "Support synchronous non-call exceptions" },
1088 {"profile-arcs", &profile_arc_flag, 1,
1089 "Insert arc based program profiling code" },
1090 {"test-coverage", &flag_test_coverage, 1,
1091 "Create data files needed by gcov" },
1092 {"branch-probabilities", &flag_branch_probabilities, 1,
1093 "Use profiling information for branch probabilities" },
1094 {"reorder-blocks", &flag_reorder_blocks, 1,
1095 "Reorder basic blocks to improve code placement" },
1096 {"rename-registers", &flag_rename_registers, 1,
1097 "Do the register renaming optimization pass"},
1098 {"common", &flag_no_common, 0,
1099 "Do not put unitialised globals in the common section" },
1100 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1101 "Do not generate .size directives" },
1102 {"function-sections", &flag_function_sections, 1,
1103 "place each function into its own section" },
1104 {"data-sections", &flag_data_sections, 1,
1105 "place data items into their own section" },
1106 {"verbose-asm", &flag_verbose_asm, 1,
1107 "Add extra commentry to assembler output"},
1108 {"gnu-linker", &flag_gnu_linker, 1,
1109 "Output GNU ld formatted global initialisers"},
1110 {"regmove", &flag_regmove, 1,
1111 "Enables a register move optimisation"},
1112 {"optimize-register-move", &flag_regmove, 1,
1113 "Do the full regmove optimization pass"},
1114 {"pack-struct", &flag_pack_struct, 1,
1115 "Pack structure members together without holes" },
1116 {"stack-check", &flag_stack_check, 1,
1117 "Insert stack checking code into the program" },
1118 {"argument-alias", &flag_argument_noalias, 0,
1119 "Specify that arguments may alias each other & globals"},
1120 {"argument-noalias", &flag_argument_noalias, 1,
1121 "Assume arguments may alias globals but not each other"},
1122 {"argument-noalias-global", &flag_argument_noalias, 2,
1123 "Assume arguments do not alias each other or globals" },
1124 {"strict-aliasing", &flag_strict_aliasing, 1,
1125 "Assume strict aliasing rules apply" },
1126 {"align-loops", &align_loops, 0,
1127 "Align the start of loops" },
1128 {"align-jumps", &align_jumps, 0,
1129 "Align labels which are only reached by jumping" },
1130 {"align-labels", &align_labels, 0,
1131 "Align all labels" },
1132 {"align-functions", &align_functions, 0,
1133 "Align the start of functions" },
1134 {"check-memory-usage", &flag_check_memory_usage, 1,
1135 "Generate code to check every memory access" },
1136 {"prefix-function-name", &flag_prefix_function_name, 1,
1137 "Add a prefix to all function names" },
1138 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1139 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1140 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1141 "Instrument function entry/exit with profiling calls"},
1142 {"ssa", &flag_ssa, 1,
1143 "Enable SSA optimizations" },
1144 {"dce", &flag_dce, 1,
1145 "Enable dead code elimination" },
1146 {"leading-underscore", &flag_leading_underscore, 1,
1147 "External symbols have a leading underscore" },
1148 {"ident", &flag_no_ident, 0,
1149 "Process #ident directives"},
1150 { "peephole2", &flag_peephole2, 1,
1151 "Enables an rtl peephole pass run before sched2" },
1152 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1153 "Enables guessing of branch probabilities" },
1154 {"math-errno", &flag_errno_math, 1,
1155 "Set errno after built-in math functions"},
1156 {"trapping-math", &flag_trapping_math, 1,
1157 "Floating-point operations can trap"},
1158 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1159 "Allow math optimizations that may violate IEEE or ANSI standards"},
1160 {"bounded-pointers", &flag_bounded_pointers, 1,
1161 "Compile pointers as triples: value, base & end" },
1162 {"bounds-check", &flag_bounds_check, 1,
1163 "Generate code to check bounds before dereferencing pointers and arrays" },
1164 {"single-precision-constant", &flag_single_precision_constant, 1,
1165 "Convert floating point constant to single precision constant"},
1166 {"time-report", &time_report, 1,
1167 "Report time taken by each compiler pass at end of run"},
1168 {"mem-report", &mem_report, 1,
1169 "Report on permanent memory allocation at end of run"},
1170 { "trapv", &flag_trapv, 1,
1171 "Trap for signed overflow in addition / subtraction / multiplication." },
1174 /* Table of language-specific options. */
1176 static struct lang_opt
1179 const char *description;
1181 documented_lang_options[] =
1183 /* In order not to overload the --help output, the convention
1184 used here is to only describe those options which are not
1185 enabled by default. */
1187 { "-ansi", "Compile just for ISO C89" },
1188 { "-fallow-single-precision",
1189 "Do not promote floats to double if using -traditional" },
1190 { "-std= ", "Determine language standard"},
1192 { "-fsigned-bitfields", "" },
1193 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1194 { "-fno-signed-bitfields", "" },
1195 { "-fno-unsigned-bitfields","" },
1196 { "-fsigned-char", "Make 'char' be signed by default"},
1197 { "-funsigned-char", "Make 'char' be unsigned by default"},
1198 { "-fno-signed-char", "" },
1199 { "-fno-unsigned-char", "" },
1201 { "-ftraditional", "" },
1202 { "-traditional", "Attempt to support traditional K&R style C"},
1203 { "-fnotraditional", "" },
1204 { "-fno-traditional", "" },
1207 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1208 { "-fbuiltin", "" },
1209 { "-fno-builtin", "Do not recognise any built in functions" },
1210 { "-fhosted", "Assume normal C execution environment" },
1211 { "-fno-hosted", "" },
1213 "Assume that standard libraries & main might not exist" },
1214 { "-fno-freestanding", "" },
1215 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1216 { "-fno-cond-mismatch", "" },
1217 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1218 { "-fno-dollars-in-identifiers", "" },
1219 { "-fpreprocessed", "" },
1220 { "-fno-preprocessed", "" },
1221 { "-fshort-double", "Use the same size for double as for float" },
1222 { "-fno-short-double", "" },
1223 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1224 { "-fno-short-enums", "" },
1225 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1226 { "-fno-short-wchar", "" },
1228 { "-Wall", "Enable most warning messages" },
1229 { "-Wbad-function-cast",
1230 "Warn about casting functions to incompatible types" },
1231 { "-Wno-bad-function-cast", "" },
1232 { "-Wno-missing-noreturn", "" },
1233 { "-Wmissing-format-attribute",
1234 "Warn about functions which might be candidates for format attributes" },
1235 { "-Wno-missing-format-attribute", "" },
1236 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1237 { "-Wno-cast-qual", "" },
1238 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1239 { "-Wno-char-subscripts", "" },
1240 { "-Wcomment", "Warn if nested comments are detected" },
1241 { "-Wno-comment", "" },
1242 { "-Wcomments", "Warn if nested comments are detected" },
1243 { "-Wno-comments", "" },
1244 { "-Wconversion", "Warn about possibly confusing type conversions" },
1245 { "-Wno-conversion", "" },
1246 { "-Wformat", "Warn about printf/scanf/strftime/strfmon format anomalies" },
1247 { "-Wno-format", "" },
1248 { "-Wformat-y2k", "" },
1249 { "-Wno-format-y2k",
1250 "Don't warn about strftime formats yielding 2 digit years" },
1251 { "-Wformat-extra-args", "" },
1252 { "-Wno-format-extra-args",
1253 "Don't warn about too many arguments to format functions" },
1254 { "-Wformat-nonliteral", "Warn about non-string-literal format strings" },
1255 { "-Wno-format-nonliteral", "" },
1256 { "-Wformat-security",
1257 "Warn about possible security problems with format functions" },
1258 { "-Wno-format-security", "" },
1259 { "-Wimplicit-function-declaration",
1260 "Warn about implicit function declarations" },
1261 { "-Wno-implicit-function-declaration", "" },
1262 { "-Werror-implicit-function-declaration", "" },
1263 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1264 { "-Wno-implicit-int", "" },
1265 { "-Wimplicit", "" },
1266 { "-Wno-implicit", "" },
1267 { "-Wimport", "Warn about the use of the #import directive" },
1268 { "-Wno-import", "" },
1269 { "-Wlong-long","" },
1270 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1271 { "-Wmain", "Warn about suspicious declarations of main" },
1272 { "-Wno-main", "" },
1273 { "-Wmissing-braces",
1274 "Warn about possibly missing braces around initialisers" },
1275 { "-Wno-missing-braces", "" },
1276 { "-Wmissing-declarations",
1277 "Warn about global funcs without previous declarations"},
1278 { "-Wno-missing-declarations", "" },
1279 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1280 { "-Wno-missing-prototypes", "" },
1281 { "-Wmultichar", "Warn about use of multicharacter literals"},
1282 { "-Wno-multichar", "" },
1283 { "-Wnested-externs", "Warn about externs not at file scope level" },
1284 { "-Wno-nested-externs", "" },
1285 { "-Wparentheses", "Warn about possible missing parentheses" },
1286 { "-Wno-parentheses", "" },
1287 { "-Wsequence-point",
1288 "Warn about possible violations of sequence point rules" },
1289 { "-Wno-sequence-point", "" },
1290 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1291 { "-Wno-pointer-arith", "" },
1292 { "-Wredundant-decls",
1293 "Warn about multiple declarations of the same object" },
1294 { "-Wno-redundant-decls", "" },
1295 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1296 { "-Wno-sign-compare", "" },
1297 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1298 { "-Wno-float-equal", "" },
1299 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1300 { "-Wno-unknown-pragmas", "" },
1301 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1302 { "-Wno-strict-prototypes", "" },
1303 { "-Wtraditional", "Warn about constructs whose meaning change in ISO C"},
1304 { "-Wno-traditional", "" },
1305 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1306 { "-Wno-trigraphs", "" },
1308 { "-Wno-undef", "" },
1309 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1310 { "-Wno-write-strings", "" },
1312 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1314 #include "options.h"
1318 /* Here is a table, controlled by the tm.h file, listing each -m switch
1319 and which bits in `target_switches' it should set or clear.
1320 If VALUE is positive, it is bits to set.
1321 If VALUE is negative, -VALUE is bits to clear.
1322 (The sign bit is not used so there is no confusion.) */
1328 const char *description;
1330 target_switches [] = TARGET_SWITCHES;
1332 /* This table is similar, but allows the switch to have a value. */
1334 #ifdef TARGET_OPTIONS
1338 const char **variable;
1339 const char *description;
1341 target_options [] = TARGET_OPTIONS;
1344 /* Options controlling warnings. */
1346 /* Don't print warning messages. -w. */
1348 int inhibit_warnings = 0;
1350 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1352 int warn_system_headers = 0;
1354 /* Print various extra warnings. -W. */
1356 int extra_warnings = 0;
1358 /* Treat warnings as errors. -Werror. */
1360 int warnings_are_errors = 0;
1362 /* Nonzero to warn about unused variables, functions et.al. */
1364 int warn_unused_function;
1365 int warn_unused_label;
1366 int warn_unused_parameter;
1367 int warn_unused_variable;
1368 int warn_unused_value;
1371 set_Wunused (setting)
1374 warn_unused_function = setting;
1375 warn_unused_label = setting;
1376 /* Unused function parameter warnings are reported when either ``-W
1377 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1378 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1380 warn_unused_parameter = 0;
1381 else if (!warn_unused_parameter)
1382 warn_unused_parameter = -1;
1383 warn_unused_variable = setting;
1384 warn_unused_value = setting;
1387 /* Nonzero to warn about code which is never reached. */
1389 int warn_notreached;
1391 /* Nonzero to warn about variables used before they are initialized. */
1393 int warn_uninitialized;
1395 /* Nonzero means warn about all declarations which shadow others. */
1399 /* Warn if a switch on an enum fails to have a case for every enum value. */
1403 /* Nonzero means warn about function definitions that default the return type
1404 or that use a null return and have a return-type other than void. */
1406 int warn_return_type;
1408 /* Nonzero means warn about pointer casts that increase the required
1409 alignment of the target type (and might therefore lead to a crash
1410 due to a misaligned access). */
1412 int warn_cast_align;
1414 /* Nonzero means warn about any identifiers that match in the first N
1415 characters. The value N is in `id_clash_len'. */
1420 /* Nonzero means warn about any objects definitions whose size is larger
1421 than N bytes. Also want about function definitions whose returned
1422 values are larger than N bytes. The value N is in `larger_than_size'. */
1424 int warn_larger_than;
1425 HOST_WIDE_INT larger_than_size;
1427 /* Nonzero means warn if inline function is too large. */
1431 /* Warn if a function returns an aggregate,
1432 since there are often incompatible calling conventions for doing this. */
1434 int warn_aggregate_return;
1436 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1440 /* Warn when gcc pads a structure to an alignment boundary. */
1444 /* Warn when an optimization pass is disabled. */
1446 int warn_disabled_optimization;
1448 /* Warn about functions which might be candidates for attribute noreturn. */
1450 int warn_missing_noreturn;
1452 /* Likewise for -W. */
1454 lang_independent_options W_options[] =
1456 {"unused-function", &warn_unused_function, 1, "Warn when a function is unused" },
1457 {"unused-label", &warn_unused_label, 1, "Warn when a label is unused" },
1458 {"unused-parameter", &warn_unused_parameter, 1, "Warn when a function parameter is unused" },
1459 {"unused-variable", &warn_unused_variable, 1, "Warn when a variable is unused" },
1460 {"unused-value", &warn_unused_value, 1, "Warn when an expression value is unused" },
1461 {"system-headers", &warn_system_headers, 1, "Do not suppress warnings from system headers"},
1462 {"error", &warnings_are_errors, 1, ""},
1463 {"shadow", &warn_shadow, 1, "Warn when one local variable shadows another" },
1464 {"switch", &warn_switch, 1,
1465 "Warn about enumerated switches missing a specific case" },
1466 {"aggregate-return", &warn_aggregate_return, 1,
1467 "Warn about returning structures, unions or arrays" },
1468 {"cast-align", &warn_cast_align, 1,
1469 "Warn about pointer casts which increase alignment" },
1470 {"unreachable-code", &warn_notreached, 1,
1471 "Warn about code that will never be executed" },
1472 {"uninitialized", &warn_uninitialized, 1,
1473 "Warn about unitialized automatic variables"},
1474 {"inline", &warn_inline, 1,
1475 "Warn when an inlined function cannot be inlined"},
1476 {"packed", &warn_packed, 1,
1477 "Warn when the packed attribute has no effect on struct layout"},
1478 {"padded", &warn_padded, 1,
1479 "Warn when padding is required to align struct members"},
1480 {"disabled-optimization", &warn_disabled_optimization, 1,
1481 "Warn when an optimization pass is disabled"},
1482 {"missing-noreturn", &warn_missing_noreturn, 1,
1483 "Warn about functions which might be candidates for attribute noreturn"}
1486 /* The following routines are useful in setting all the flags that
1487 -ffast-math and -fno-fast-math imply. */
1490 set_fast_math_flags ()
1492 flag_trapping_math = 0;
1493 flag_unsafe_math_optimizations = 1;
1494 flag_errno_math = 0;
1498 set_no_fast_math_flags ()
1500 flag_trapping_math = 1;
1501 flag_unsafe_math_optimizations = 0;
1502 flag_errno_math = 1;
1506 /* Output files for assembler code (real compiler output)
1507 and debugging dumps. */
1510 FILE *aux_info_file;
1511 FILE *rtl_dump_file = NULL;
1513 /* Decode the string P as an integral parameter.
1514 If the string is indeed an integer return its numeric value else
1515 issue an Invalid Option error for the option PNAME and return DEFVAL.
1516 If PNAME is zero just return DEFVAL, do not call error. */
1519 read_integral_parameter (p, pname, defval)
1524 const char *endp = p;
1528 if (*endp >= '0' && *endp <= '9')
1537 error ("Invalid option `%s'", pname);
1545 /* This is the default decl_printable_name function. */
1548 decl_name (decl, verbosity)
1550 int verbosity ATTRIBUTE_UNUSED;
1552 return IDENTIFIER_POINTER (DECL_NAME (decl));
1556 /* This calls abort and is used to avoid problems when abort if a macro.
1557 It is used when we need to pass the address of abort. */
1565 /* When `malloc.c' is compiled with `rcheck' defined,
1566 it calls this function to report clobberage. */
1570 const char *s ATTRIBUTE_UNUSED;
1575 /* Return the logarithm of X, base 2, considering X unsigned,
1576 if X is a power of 2. Otherwise, returns -1.
1578 This should be used via the `exact_log2' macro. */
1582 register unsigned HOST_WIDE_INT x;
1584 register int log = 0;
1585 /* Test for 0 or a power of 2. */
1586 if (x == 0 || x != (x & -x))
1588 while ((x >>= 1) != 0)
1593 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1594 If X is 0, return -1.
1596 This should be used via the floor_log2 macro. */
1600 register unsigned HOST_WIDE_INT x;
1602 register int log = -1;
1609 /* Return the approximate positive square root of a number N. This is for
1610 statistical reports, not code generation. */
1625 d = (s * s - x) / (2 * s);
1632 static int float_handler_set;
1634 jmp_buf float_handler;
1636 /* Signals actually come here. */
1639 float_signal (signo)
1640 /* If this is missing, some compilers complain. */
1641 int signo ATTRIBUTE_UNUSED;
1643 if (float_handled == 0)
1644 crash_signal (signo);
1645 #if defined (USG) || defined (hpux)
1646 /* Re-enable the signal catcher. */
1647 signal (SIGFPE, float_signal);
1650 signal (SIGFPE, float_signal);
1651 longjmp (float_handler, 1);
1654 /* Specify where to longjmp to when a floating arithmetic error happens.
1655 If HANDLER is 0, it means don't handle the errors any more. */
1658 set_float_handler (handler)
1661 float_handled = (handler != 0);
1663 memcpy (float_handler, handler, sizeof (float_handler));
1665 if (float_handled && ! float_handler_set)
1667 signal (SIGFPE, float_signal);
1668 float_handler_set = 1;
1672 /* This is a wrapper function for code which might elicit an
1673 arithmetic exception. That code should be passed in as a function
1674 pointer FN, and one argument DATA. DATA is usually a struct which
1675 contains the real input and output for function FN. This function
1676 returns 0 (failure) if longjmp was called (i.e. an exception
1677 occured.) It returns 1 (success) otherwise. */
1680 do_float_handler (fn, data)
1681 void (*fn) PARAMS ((PTR));
1688 /* We got here via longjmp () caused by an exception in function
1690 set_float_handler (NULL);
1694 set_float_handler (buf);
1696 set_float_handler (NULL);
1700 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1701 into ICE messages, which is much more user friendly. */
1704 crash_signal (signo)
1707 internal_error ("Internal error: %s", strsignal (signo));
1710 /* Strip off a legitimate source ending from the input string NAME of
1711 length LEN. Rather than having to know the names used by all of
1712 our front ends, we strip off an ending of a period followed by
1713 up to five characters. (Java uses ".class".) */
1716 strip_off_ending (name, len)
1721 for (i = 2; i < 6 && len > i; i++)
1723 if (name[len - i] == '.')
1725 name[len - i] = '\0';
1731 /* Output a quoted string. */
1734 output_quoted_string (asm_file, string)
1738 #ifdef OUTPUT_QUOTED_STRING
1739 OUTPUT_QUOTED_STRING (asm_file, string);
1743 putc ('\"', asm_file);
1744 while ((c = *string++) != 0)
1746 if (c == '\"' || c == '\\')
1747 putc ('\\', asm_file);
1750 putc ('\"', asm_file);
1754 /* Output a file name in the form wanted by System V. */
1757 output_file_directive (asm_file, input_name)
1759 const char *input_name;
1761 int len = strlen (input_name);
1762 const char *na = input_name + len;
1764 /* NA gets INPUT_NAME sans directory names. */
1765 while (na > input_name)
1767 if (IS_DIR_SEPARATOR (na[-1]))
1772 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1773 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1775 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1776 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1778 fprintf (asm_file, "\t.file\t");
1779 output_quoted_string (asm_file, na);
1780 fputc ('\n', asm_file);
1785 #ifdef ASM_IDENTIFY_LANGUAGE
1786 /* Routine to build language identifier for object file. */
1789 output_lang_identify (asm_out_file)
1792 int len = strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1793 char *s = (char *) alloca (len);
1795 sprintf (s, "__gnu_compiled_%s", lang_identify ());
1796 ASM_OUTPUT_LABEL (asm_out_file, s);
1800 /* Routine to open a dump file. Return true if the dump file is enabled. */
1803 open_dump_file (index, decl)
1804 enum dump_file_index index;
1808 const char *open_arg;
1811 if (! dump_file[index].enabled)
1814 timevar_push (TV_DUMP);
1815 if (rtl_dump_file != NULL)
1816 fclose (rtl_dump_file);
1818 sprintf (seq, ".%02d.", index);
1820 if (! dump_file[index].initialized)
1822 /* If we've not initialized the files, do so now. */
1823 if (graph_dump_format != no_graph
1824 && dump_file[index].graph_dump_p)
1826 dump_name = concat (seq, dump_file[index].extension, NULL);
1827 clean_graph_dump_file (dump_base_name, dump_name);
1830 dump_file[index].initialized = 1;
1836 dump_name = concat (dump_base_name, seq,
1837 dump_file[index].extension, NULL);
1839 rtl_dump_file = fopen (dump_name, open_arg);
1840 if (rtl_dump_file == NULL)
1841 fatal_io_error ("can't open %s", dump_name);
1846 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1847 decl_printable_name (decl, 2));
1849 timevar_pop (TV_DUMP);
1853 /* Routine to close a dump file. */
1856 close_dump_file (index, func, insns)
1857 enum dump_file_index index;
1858 void (*func) PARAMS ((FILE *, rtx));
1861 if (! rtl_dump_file)
1864 timevar_push (TV_DUMP);
1866 && graph_dump_format != no_graph
1867 && dump_file[index].graph_dump_p)
1872 sprintf (seq, ".%02d.", index);
1873 suffix = concat (seq, dump_file[index].extension, NULL);
1874 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1879 func (rtl_dump_file, insns);
1881 fflush (rtl_dump_file);
1882 fclose (rtl_dump_file);
1884 rtl_dump_file = NULL;
1885 timevar_pop (TV_DUMP);
1888 /* Do any final processing required for the declarations in VEC, of
1889 which there are LEN. We write out inline functions and variables
1890 that have been deferred until this point, but which are required.
1891 Returns non-zero if anything was put out. */
1894 wrapup_global_declarations (vec, len)
1901 int output_something = 0;
1903 for (i = 0; i < len; i++)
1907 /* We're not deferring this any longer. */
1908 DECL_DEFER_OUTPUT (decl) = 0;
1910 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1911 && incomplete_decl_finalize_hook != 0)
1912 (*incomplete_decl_finalize_hook) (decl);
1915 /* Now emit any global variables or functions that we have been
1916 putting off. We need to loop in case one of the things emitted
1917 here references another one which comes earlier in the list. */
1921 for (i = 0; i < len; i++)
1925 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1928 /* Don't write out static consts, unless we still need them.
1930 We also keep static consts if not optimizing (for debugging),
1931 unless the user specified -fno-keep-static-consts.
1932 ??? They might be better written into the debug information.
1933 This is possible when using DWARF.
1935 A language processor that wants static constants to be always
1936 written out (even if it is not used) is responsible for
1937 calling rest_of_decl_compilation itself. E.g. the C front-end
1938 calls rest_of_decl_compilation from finish_decl.
1939 One motivation for this is that is conventional in some
1940 environments to write things like:
1941 static const char rcsid[] = "... version string ...";
1942 intending to force the string to be in the executable.
1944 A language processor that would prefer to have unneeded
1945 static constants "optimized away" would just defer writing
1946 them out until here. E.g. C++ does this, because static
1947 constants are often defined in header files.
1949 ??? A tempting alternative (for both C and C++) would be
1950 to force a constant to be written if and only if it is
1951 defined in a main file, as opposed to an include file. */
1953 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1954 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1955 && !DECL_COMDAT (decl))
1957 && flag_keep_static_consts
1958 && !DECL_ARTIFICIAL (decl))
1959 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1962 rest_of_decl_compilation (decl, NULL_PTR, 1, 1);
1965 if (TREE_CODE (decl) == FUNCTION_DECL
1966 && DECL_INITIAL (decl) != 0
1967 && DECL_SAVED_INSNS (decl) != 0
1968 && (flag_keep_inline_functions
1969 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1970 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1973 output_inline_function (decl);
1978 output_something = 1;
1982 return output_something;
1985 /* Issue appropriate warnings for the global declarations in VEC (of
1986 which there are LEN). Output debugging information for them. */
1989 check_global_declarations (vec, len)
1996 for (i = 0; i < len; i++)
2000 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2001 && ! TREE_ASM_WRITTEN (decl))
2002 /* Cancel the RTL for this decl so that, if debugging info
2003 output for global variables is still to come,
2004 this one will be omitted. */
2005 SET_DECL_RTL (decl, NULL_RTX);
2007 /* Warn about any function
2008 declared static but not defined.
2009 We don't warn about variables,
2010 because many programs have static variables
2011 that exist only to get some text into the object file. */
2012 if (TREE_CODE (decl) == FUNCTION_DECL
2013 && (warn_unused_function
2014 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2015 && DECL_INITIAL (decl) == 0
2016 && DECL_EXTERNAL (decl)
2017 && ! DECL_ARTIFICIAL (decl)
2018 && ! TREE_PUBLIC (decl))
2020 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2021 pedwarn_with_decl (decl,
2022 "`%s' used but never defined");
2024 warning_with_decl (decl,
2025 "`%s' declared `static' but never defined");
2026 /* This symbol is effectively an "extern" declaration now. */
2027 TREE_PUBLIC (decl) = 1;
2028 assemble_external (decl);
2031 /* Warn about static fns or vars defined but not used,
2032 but not about inline functions or static consts
2033 since defining those in header files is normal practice. */
2034 if (((warn_unused_function
2035 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2036 || (warn_unused_variable
2037 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2038 && ! DECL_IN_SYSTEM_HEADER (decl)
2039 && ! DECL_EXTERNAL (decl)
2040 && ! TREE_PUBLIC (decl)
2041 && ! TREE_USED (decl)
2042 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2043 /* The TREE_USED bit for file-scope decls
2044 is kept in the identifier, to handle multiple
2045 external decls in different scopes. */
2046 && ! TREE_USED (DECL_NAME (decl)))
2047 warning_with_decl (decl, "`%s' defined but not used");
2049 timevar_push (TV_SYMOUT);
2050 #ifdef SDB_DEBUGGING_INFO
2051 /* The COFF linker can move initialized global vars to the end.
2052 And that can screw up the symbol ordering.
2053 By putting the symbols in that order to begin with,
2054 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2055 if (write_symbols == SDB_DEBUG && TREE_CODE (decl) == VAR_DECL
2056 && TREE_PUBLIC (decl) && DECL_INITIAL (decl)
2057 && ! DECL_EXTERNAL (decl)
2058 && DECL_RTL (decl) != 0)
2059 sdbout_symbol (decl, 0);
2061 /* Output COFF information for non-global
2062 file-scope initialized variables. */
2063 if (write_symbols == SDB_DEBUG
2064 && TREE_CODE (decl) == VAR_DECL
2065 && DECL_INITIAL (decl)
2066 && ! DECL_EXTERNAL (decl)
2067 && DECL_RTL (decl) != 0
2068 && GET_CODE (DECL_RTL (decl)) == MEM)
2069 sdbout_toplevel_data (decl);
2070 #endif /* SDB_DEBUGGING_INFO */
2071 #ifdef DWARF_DEBUGGING_INFO
2072 /* Output DWARF information for file-scope tentative data object
2073 declarations, file-scope (extern) function declarations (which
2074 had no corresponding body) and file-scope tagged type declarations
2075 and definitions which have not yet been forced out. */
2077 if (write_symbols == DWARF_DEBUG
2078 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2079 dwarfout_file_scope_decl (decl, 1);
2081 #ifdef DWARF2_DEBUGGING_INFO
2082 /* Output DWARF2 information for file-scope tentative data object
2083 declarations, file-scope (extern) function declarations (which
2084 had no corresponding body) and file-scope tagged type declarations
2085 and definitions which have not yet been forced out. */
2087 if (write_symbols == DWARF2_DEBUG
2088 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2089 dwarf2out_decl (decl);
2091 timevar_pop (TV_SYMOUT);
2095 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2096 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2097 INPUT_FILENAME and LINENO accordingly. */
2100 push_srcloc (file, line)
2104 struct file_stack *fs;
2106 if (input_file_stack)
2108 input_file_stack->name = input_filename;
2109 input_file_stack->line = lineno;
2112 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2113 fs->name = input_filename = file;
2114 fs->line = lineno = line;
2115 fs->indent_level = 0;
2116 fs->next = input_file_stack;
2117 input_file_stack = fs;
2118 input_file_stack_tick++;
2121 /* Pop the top entry off the stack of presently open source files.
2122 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2128 struct file_stack *fs;
2130 fs = input_file_stack;
2131 input_file_stack = fs->next;
2133 input_file_stack_tick++;
2134 /* The initial source file is never popped. */
2135 if (!input_file_stack)
2137 input_filename = input_file_stack->name;
2138 lineno = input_file_stack->line;
2141 /* Compile an entire file of output from cpp, named NAME.
2142 Write a file of assembly output and various debugging dumps. */
2150 int name_specified = name != 0;
2152 if (dump_base_name == 0)
2153 dump_base_name = name ? name : "gccdump";
2158 /* Start timing total execution time. */
2161 timevar_start (TV_TOTAL);
2163 /* Initialize data in various passes. */
2166 name = init_parse (name);
2167 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2168 || debug_info_level == DINFO_LEVEL_VERBOSE
2169 || flag_test_coverage
2170 || warn_notreached);
2173 init_decl_processing ();
2179 init_function_once ();
2180 init_stor_layout_once ();
2181 init_varasm_once ();
2182 init_EXPR_INSN_LIST_cache ();
2184 /* The following initialization functions need to generate rtl, so
2185 provide a dummy function context for them. */
2186 init_dummy_function_start ();
2189 if (flag_caller_saves)
2190 init_caller_save ();
2191 expand_dummy_function_end ();
2193 /* If auxiliary info generation is desired, open the output file.
2194 This goes in the same directory as the source file--unlike
2195 all the other output files. */
2196 if (flag_gen_aux_info)
2198 aux_info_file = fopen (aux_info_file_name, "w");
2199 if (aux_info_file == 0)
2200 fatal_io_error ("can't open %s", aux_info_file_name);
2203 /* Open assembler code output file. Do this even if -fsyntax-only is on,
2204 because then the driver will have provided the name of a temporary
2205 file or bit bucket for us. */
2207 if (! name_specified && asm_file_name == 0)
2208 asm_out_file = stdout;
2211 if (asm_file_name == 0)
2213 int len = strlen (dump_base_name);
2214 char *dumpname = (char *) xmalloc (len + 6);
2215 memcpy (dumpname, dump_base_name, len + 1);
2216 strip_off_ending (dumpname, len);
2217 strcat (dumpname, ".s");
2218 asm_file_name = dumpname;
2220 if (!strcmp (asm_file_name, "-"))
2221 asm_out_file = stdout;
2223 asm_out_file = fopen (asm_file_name, "w");
2224 if (asm_out_file == 0)
2225 fatal_io_error ("can't open %s for writing", asm_file_name);
2228 #ifdef IO_BUFFER_SIZE
2229 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
2230 _IOFBF, IO_BUFFER_SIZE);
2234 name = ggc_strdup (name);
2236 input_filename = name;
2238 /* Put an entry on the input file stack for the main input file. */
2239 push_srcloc (input_filename, 0);
2241 /* Perform language-specific initialization.
2242 This may set main_input_filename. */
2243 if (lang_hooks.init)
2244 (*lang_hooks.init) ();
2246 /* If the input doesn't start with a #line, use the input name
2247 as the official input file name. */
2248 if (main_input_filename == 0)
2249 main_input_filename = name;
2251 if (flag_syntax_only)
2253 write_symbols = NO_DEBUG;
2255 profile_block_flag = 0;
2259 ASM_FILE_START (asm_out_file);
2261 #ifdef ASM_COMMENT_START
2262 if (flag_verbose_asm)
2264 /* Print the list of options in effect. */
2265 print_version (asm_out_file, ASM_COMMENT_START);
2266 print_switch_values (asm_out_file, 0, MAX_LINE,
2267 ASM_COMMENT_START, " ", "\n");
2268 /* Add a blank line here so it appears in assembler output but not
2270 fprintf (asm_out_file, "\n");
2274 /* Output something to inform GDB that this compilation was by GCC. */
2275 #ifndef ASM_IDENTIFY_GCC
2276 fprintf (asm_out_file, "gcc2_compiled.:\n");
2278 ASM_IDENTIFY_GCC (asm_out_file);
2281 /* Output something to identify which front-end produced this file. */
2282 #ifdef ASM_IDENTIFY_LANGUAGE
2283 ASM_IDENTIFY_LANGUAGE (asm_out_file);
2285 } /* ! flag_syntax_only */
2287 #ifndef ASM_OUTPUT_SECTION_NAME
2288 if (flag_function_sections)
2290 warning ("-ffunction-sections not supported for this target.");
2291 flag_function_sections = 0;
2293 if (flag_data_sections)
2295 warning ("-fdata-sections not supported for this target.");
2296 flag_data_sections = 0;
2300 if (flag_function_sections
2301 && (profile_flag || profile_block_flag))
2303 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2304 flag_function_sections = 0;
2307 #ifndef OBJECT_FORMAT_ELF
2308 if (flag_function_sections && write_symbols != NO_DEBUG)
2309 warning ("-ffunction-sections may affect debugging on some targets.");
2312 /* ??? Note: There used to be a conditional here
2313 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2314 This was to guarantee separation between gcc_compiled. and
2315 the first function, for the sake of dbx on Suns.
2316 However, having the extra zero here confused the Emacs
2317 code for unexec, and might confuse other programs too.
2318 Therefore, I took out that change.
2319 In future versions we should find another way to solve
2320 that dbx problem. -- rms, 23 May 93. */
2322 /* Don't let the first function fall at the same address
2323 as gcc_compiled., if profiling. */
2324 if (profile_flag || profile_block_flag)
2326 /* It's best if we can write a nop here since some
2327 assemblers don't tolerate zeros in the text section. */
2328 output_asm_insn (get_insn_template (CODE_FOR_nop, NULL), NULL_PTR);
2331 /* If dbx symbol table desired, initialize writing it
2332 and output the predefined types. */
2333 timevar_push (TV_SYMOUT);
2334 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2335 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2336 dbxout_init (asm_out_file, main_input_filename, getdecls ());
2338 #ifdef SDB_DEBUGGING_INFO
2339 if (write_symbols == SDB_DEBUG)
2340 sdbout_init (asm_out_file, main_input_filename, getdecls ());
2342 #ifdef DWARF_DEBUGGING_INFO
2343 if (write_symbols == DWARF_DEBUG)
2344 dwarfout_init (asm_out_file, main_input_filename);
2346 #ifdef DWARF2_UNWIND_INFO
2347 if (dwarf2out_do_frame ())
2348 dwarf2out_frame_init ();
2350 #ifdef DWARF2_DEBUGGING_INFO
2351 if (write_symbols == DWARF2_DEBUG)
2352 dwarf2out_init (asm_out_file, main_input_filename);
2354 timevar_pop (TV_SYMOUT);
2356 /* Initialize yet another pass. */
2358 init_final (main_input_filename);
2359 init_branch_prob (dump_base_name);
2361 timevar_push (TV_PARSE);
2363 /* Call the parser, which parses the entire file
2364 (calling rest_of_compilation for each function). */
2366 if (yyparse () != 0)
2368 if (errorcount == 0)
2369 fnotice (stderr, "Errors detected in input file (your bison.simple is out of date)\n");
2371 /* In case there were missing closebraces,
2372 get us back to the global binding level. */
2373 while (! global_bindings_p ())
2377 /* Compilation is now finished except for writing
2378 what's left of the symbol table output. */
2380 timevar_pop (TV_PARSE);
2382 if (flag_syntax_only)
2385 globals = getdecls ();
2387 /* Really define vars that have had only a tentative definition.
2388 Really output inline functions that must actually be callable
2389 and have not been output so far. */
2392 int len = list_length (globals);
2393 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2397 /* Process the decls in reverse order--earliest first.
2398 Put them into VEC from back to front, then take out from front. */
2400 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2401 vec[len - i - 1] = decl;
2403 wrapup_global_declarations (vec, len);
2405 /* This must occur after the loop to output deferred functions. Else
2406 the profiler initializer would not be emitted if all the functions
2407 in this compilation unit were deferred.
2409 output_func_start_profiler can not cause any additional functions or
2410 data to need to be output, so it need not be in the deferred function
2412 output_func_start_profiler ();
2414 /* Now that all possible functions have been output, we can dump
2415 the exception table. */
2417 #ifndef IA64_UNWIND_INFO
2418 output_exception_table ();
2420 free_exception_table ();
2422 check_global_declarations (vec, len);
2428 /* Write out any pending weak symbol declarations. */
2432 /* Do dbx symbols. */
2433 timevar_push (TV_SYMOUT);
2434 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2435 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2436 dbxout_finish (asm_out_file, main_input_filename);
2439 #ifdef DWARF_DEBUGGING_INFO
2440 if (write_symbols == DWARF_DEBUG)
2444 #ifdef DWARF2_UNWIND_INFO
2445 if (dwarf2out_do_frame ())
2446 dwarf2out_frame_finish ();
2449 #ifdef DWARF2_DEBUGGING_INFO
2450 if (write_symbols == DWARF2_DEBUG)
2451 dwarf2out_finish ();
2453 timevar_pop (TV_SYMOUT);
2455 /* Output some stuff at end of file if nec. */
2457 end_final (dump_base_name);
2459 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2461 timevar_push (TV_DUMP);
2462 open_dump_file (DFI_bp, NULL);
2466 close_dump_file (DFI_bp, NULL, NULL_RTX);
2467 timevar_pop (TV_DUMP);
2471 ASM_FILE_END (asm_out_file);
2474 /* Language-specific end of compilation actions. */
2476 if (lang_hooks.finish)
2477 (*lang_hooks.finish) ();
2479 /* Close the dump files. */
2481 if (flag_gen_aux_info)
2483 fclose (aux_info_file);
2485 unlink (aux_info_file_name);
2488 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2490 timevar_push (TV_DUMP);
2491 dump_combine_total_stats (rtl_dump_file);
2492 close_dump_file (DFI_combine, NULL, NULL_RTX);
2493 timevar_pop (TV_DUMP);
2496 /* Close non-debugging input and output files. Take special care to note
2497 whether fclose returns an error, since the pages might still be on the
2498 buffer chain while the file is open. */
2502 if (ferror (asm_out_file) != 0)
2503 fatal_io_error ("error writing to %s", asm_file_name);
2504 if (fclose (asm_out_file) != 0)
2505 fatal_io_error ("error closing %s", asm_file_name);
2507 /* Do whatever is necessary to finish printing the graphs. */
2508 if (graph_dump_format != no_graph)
2512 for (i = 0; i < (int) DFI_MAX; ++i)
2513 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
2518 sprintf (seq, ".%02d.", i);
2519 suffix = concat (seq, dump_file[i].extension, NULL);
2520 finish_graph_dump_file (dump_base_name, suffix);
2527 ggc_print_statistics ();
2528 stringpool_statistics ();
2531 /* Free up memory for the benefit of leak detectors. */
2534 /* Stop timing total execution time. */
2535 timevar_stop (TV_TOTAL);
2537 /* Print the times. */
2539 timevar_print (stderr);
2542 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2543 and TYPE_DECL nodes.
2545 This does nothing for local (non-static) variables, unless the
2546 variable is a register variable with an ASMSPEC. In that case, or
2547 if the variable is not an automatice, it sets up the RTL and
2548 outputs any assembler code (label definition, storage allocation
2549 and initialization).
2551 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2552 the assembler symbol name to be used. TOP_LEVEL is nonzero
2553 if this declaration is not within a function. */
2556 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2558 const char *asmspec;
2562 /* Declarations of variables, and of functions defined elsewhere. */
2564 /* The most obvious approach, to put an #ifndef around where
2565 this macro is used, doesn't work since it's inside a macro call. */
2566 #ifndef ASM_FINISH_DECLARE_OBJECT
2567 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2570 /* Forward declarations for nested functions are not "external",
2571 but we need to treat them as if they were. */
2572 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2573 || TREE_CODE (decl) == FUNCTION_DECL)
2575 timevar_push (TV_VARCONST);
2577 make_decl_rtl (decl, asmspec);
2578 /* Don't output anything
2579 when a tentative file-scope definition is seen.
2580 But at end of compilation, do output code for them. */
2581 if (at_end || !DECL_DEFER_OUTPUT (decl))
2582 assemble_variable (decl, top_level, at_end, 0);
2583 if (decl == last_assemble_variable_decl)
2585 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2588 timevar_pop (TV_VARCONST);
2590 else if (DECL_REGISTER (decl) && asmspec != 0)
2592 if (decode_reg_name (asmspec) >= 0)
2594 SET_DECL_RTL (decl, NULL_RTX);
2595 make_decl_rtl (decl, asmspec);
2599 error ("invalid register name `%s' for register variable", asmspec);
2600 DECL_REGISTER (decl) = 0;
2605 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2606 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2607 && TREE_CODE (decl) == TYPE_DECL)
2609 timevar_push (TV_SYMOUT);
2610 dbxout_symbol (decl, 0);
2611 timevar_pop (TV_SYMOUT);
2614 #ifdef SDB_DEBUGGING_INFO
2615 else if (write_symbols == SDB_DEBUG && top_level
2616 && TREE_CODE (decl) == TYPE_DECL)
2618 timevar_push (TV_SYMOUT);
2619 sdbout_symbol (decl, 0);
2620 timevar_pop (TV_SYMOUT);
2625 /* Called after finishing a record, union or enumeral type. */
2628 rest_of_type_compilation (type, toplev)
2629 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2633 tree type ATTRIBUTE_UNUSED;
2634 int toplev ATTRIBUTE_UNUSED;
2637 timevar_push (TV_SYMOUT);
2638 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2639 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2640 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2642 #ifdef SDB_DEBUGGING_INFO
2643 if (write_symbols == SDB_DEBUG)
2644 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2646 #ifdef DWARF2_DEBUGGING_INFO
2647 if (write_symbols == DWARF2_DEBUG && toplev)
2648 dwarf2out_decl (TYPE_STUB_DECL (type));
2650 timevar_pop (TV_SYMOUT);
2653 /* DECL is an inline function, whose body is present, but which is not
2654 being output at this point. (We're putting that off until we need
2655 to do it.) If there are any actions that need to take place,
2656 including the emission of debugging information for the function,
2657 this is where they should go. This function may be called by
2658 language-dependent code for front-ends that do not even generate
2659 RTL for functions that don't need to be put out. */
2662 note_deferral_of_defined_inline_function (decl)
2663 tree decl ATTRIBUTE_UNUSED;
2665 #ifdef DWARF_DEBUGGING_INFO
2666 /* Generate the DWARF info for the "abstract" instance of a function
2667 which we may later generate inlined and/or out-of-line instances
2669 if (write_symbols == DWARF_DEBUG
2670 && (DECL_INLINE (decl) || DECL_ABSTRACT (decl))
2671 && ! DECL_ABSTRACT_ORIGIN (decl))
2673 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2674 DWARF code expects it to be set in this case. Intuitively,
2675 DECL is the function we just finished defining, so setting
2676 CURRENT_FUNCTION_DECL is sensible. */
2677 tree saved_cfd = current_function_decl;
2678 int was_abstract = DECL_ABSTRACT (decl);
2679 current_function_decl = decl;
2681 /* Let the DWARF code do its work. */
2682 set_decl_abstract_flags (decl, 1);
2683 dwarfout_file_scope_decl (decl, 0);
2685 set_decl_abstract_flags (decl, 0);
2687 /* Reset CURRENT_FUNCTION_DECL. */
2688 current_function_decl = saved_cfd;
2693 /* FNDECL is an inline function which is about to be emitted out of line.
2694 Do any preparation, such as emitting abstract debug info for the inline
2695 before it gets mangled by optimization. */
2698 note_outlining_of_inline_function (fndecl)
2699 tree fndecl ATTRIBUTE_UNUSED;
2701 #ifdef DWARF2_DEBUGGING_INFO
2702 /* The DWARF 2 backend tries to reduce debugging bloat by not emitting
2703 the abstract description of inline functions until something tries to
2704 reference them. Force it out now, before optimizations mangle the
2706 if (write_symbols == DWARF2_DEBUG)
2707 dwarf2out_abstract_function (fndecl);
2711 /* This is called from finish_function (within yyparse)
2712 after each top-level definition is parsed.
2713 It is supposed to compile that function or variable
2714 and output the assembler code for it.
2715 After we return, the tree storage is freed. */
2718 rest_of_compilation (decl)
2724 int rebuild_label_notes_after_reload;
2725 int register_life_up_to_date;
2727 timevar_push (TV_REST_OF_COMPILATION);
2729 /* Now that we're out of the frontend, we shouldn't have any more
2730 CONCATs anywhere. */
2731 generating_concat_p = 0;
2733 /* When processing delayed functions, prepare_function_start() won't
2734 have been run to re-initialize it. */
2735 cse_not_expected = ! optimize;
2737 /* First, make sure that NOTE_BLOCK is set correctly for each
2738 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2739 if (!cfun->x_whole_function_mode_p)
2742 /* Then remove any notes we don't need. That will make iterating
2743 over the instruction sequence faster, and allow the garbage
2744 collector to reclaim the memory used by the notes. */
2745 remove_unnecessary_notes ();
2747 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2748 tree in sensible shape. So, we just recalculate it here. */
2749 if (cfun->x_whole_function_mode_p)
2754 /* If we are reconsidering an inline function
2755 at the end of compilation, skip the stuff for making it inline. */
2757 if (DECL_SAVED_INSNS (decl) == 0)
2763 /* If this is nested inside an inlined external function, pretend
2764 it was only declared. Since we cannot inline such functions,
2765 generating code for this one is not only not necessary but will
2766 confuse some debugging output writers. */
2767 for (parent = DECL_CONTEXT (current_function_decl);
2768 parent != NULL_TREE;
2769 parent = get_containing_scope (parent))
2770 if (TREE_CODE (parent) == FUNCTION_DECL
2771 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2773 DECL_INITIAL (decl) = 0;
2774 goto exit_rest_of_compilation;
2777 /* If requested, consider whether to make this function inline. */
2778 if ((DECL_INLINE (decl) && !flag_no_inline)
2779 || flag_inline_functions)
2781 timevar_push (TV_INTEGRATION);
2782 lose = function_cannot_inline_p (decl);
2783 timevar_pop (TV_INTEGRATION);
2784 if (lose || ! optimize)
2786 if (warn_inline && DECL_INLINE (decl))
2787 warning_with_decl (decl, lose);
2788 DECL_ABSTRACT_ORIGIN (decl) = 0;
2789 /* Don't really compile an extern inline function.
2790 If we can't make it inline, pretend
2791 it was only declared. */
2792 if (DECL_EXTERNAL (decl))
2794 DECL_INITIAL (decl) = 0;
2795 goto exit_rest_of_compilation;
2799 /* ??? Note that this has the effect of making it look
2800 like "inline" was specified for a function if we choose
2801 to inline it. This isn't quite right, but it's
2802 probably not worth the trouble to fix. */
2803 inlinable = DECL_INLINE (decl) = 1;
2806 insns = get_insns ();
2808 /* Dump the rtl code if we are dumping rtl. */
2810 if (open_dump_file (DFI_rtl, decl))
2812 if (DECL_SAVED_INSNS (decl))
2813 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2814 close_dump_file (DFI_rtl, print_rtl, insns);
2817 /* If function is inline, and we don't yet know whether to
2818 compile it by itself, defer decision till end of compilation.
2819 finish_compilation will call rest_of_compilation again
2820 for those functions that need to be output. Also defer those
2821 functions that we are supposed to defer. */
2824 || (DECL_INLINE (decl)
2825 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2826 && ! flag_keep_inline_functions)
2827 || DECL_EXTERNAL (decl))))
2828 DECL_DEFER_OUTPUT (decl) = 1;
2830 if (DECL_INLINE (decl))
2831 /* DWARF wants seperate debugging info for abstract and
2832 concrete instances of all inline functions, including those
2833 declared inline but not inlined, and those inlined even
2834 though they weren't declared inline. Conveniently, that's
2835 what DECL_INLINE means at this point. */
2836 note_deferral_of_defined_inline_function (decl);
2838 if (DECL_DEFER_OUTPUT (decl))
2840 /* If -Wreturn-type, we have to do a bit of compilation. We just
2841 want to call jump_optimize to figure out whether or not we can
2842 fall off the end of the function; we do the minimum amount of
2843 work necessary to make that safe. And, we set optimize to zero
2844 to keep jump_optimize from working too hard. */
2845 if (warn_return_type)
2847 int saved_optimize = optimize;
2850 find_exception_handler_labels ();
2851 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
2852 !JUMP_AFTER_REGSCAN);
2853 optimize = saved_optimize;
2856 current_function_nothrow = nothrow_function_p ();
2857 if (current_function_nothrow)
2858 /* Now we know that this can't throw; set the flag for the benefit
2859 of other functions later in this translation unit. */
2860 TREE_NOTHROW (current_function_decl) = 1;
2862 timevar_push (TV_INTEGRATION);
2863 save_for_inline (decl);
2864 timevar_pop (TV_INTEGRATION);
2865 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2866 goto exit_rest_of_compilation;
2869 /* If specified extern inline but we aren't inlining it, we are
2870 done. This goes for anything that gets here with DECL_EXTERNAL
2871 set, not just things with DECL_INLINE. */
2872 if (DECL_EXTERNAL (decl))
2873 goto exit_rest_of_compilation;
2878 /* Initialize some variables used by the optimizers. */
2879 init_function_for_compilation ();
2881 if (! DECL_DEFER_OUTPUT (decl))
2882 TREE_ASM_WRITTEN (decl) = 1;
2884 /* Now that integrate will no longer see our rtl, we need not
2885 distinguish between the return value of this function and the
2886 return value of called functions. Also, we can remove all SETs
2887 of subregs of hard registers; they are only here because of
2889 rtx_equal_function_value_matters = 0;
2890 purge_hard_subreg_sets (get_insns ());
2892 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2893 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2894 goto exit_rest_of_compilation;
2896 /* Emit code to get eh context, if needed. */
2899 /* We may have potential sibling or tail recursion sites. Select one
2900 (of possibly multiple) methods of performing the call. */
2901 if (flag_optimize_sibling_calls)
2903 timevar_push (TV_JUMP);
2904 open_dump_file (DFI_sibling, decl);
2906 optimize_sibling_and_tail_recursive_calls ();
2908 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2909 timevar_pop (TV_JUMP);
2913 /* If we are doing position-independent code generation, now
2914 is the time to output special prologues and epilogues.
2915 We do not want to do this earlier, because it just clutters
2916 up inline functions with meaningless insns. */
2921 insns = get_insns ();
2923 /* Copy any shared structure that should not be shared. */
2924 unshare_all_rtl (current_function_decl, insns);
2926 #ifdef SETJMP_VIA_SAVE_AREA
2927 /* This must be performed before virutal register instantiation. */
2928 if (current_function_calls_alloca)
2929 optimize_save_area_alloca (insns);
2932 /* Instantiate all virtual registers. */
2933 instantiate_virtual_regs (current_function_decl, insns);
2935 /* Find all the EH handlers. */
2936 find_exception_handler_labels ();
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 timevar_push (TV_JUMP);
2966 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2967 cleanup_cfg (insns);
2969 /* ??? Run if-conversion before delete_null_pointer_checks,
2970 since the later does not preserve the CFG. This should
2971 be changed -- no since converting if's that are going to
2973 timevar_push (TV_IFCVT);
2975 timevar_pop (TV_IFCVT);
2977 /* Try to identify useless null pointer tests and delete them. */
2978 if (flag_delete_null_pointer_checks)
2979 delete_null_pointer_checks (insns);
2982 /* Jump optimization, and the removal of NULL pointer checks, may
2983 have reduced the number of instructions substantially. CSE, and
2984 future passes, allocate arrays whose dimensions involve the
2985 maximum instruction UID, so if we can reduce the maximum UID
2986 we'll save big on memory. */
2987 renumber_insns (rtl_dump_file);
2988 timevar_pop (TV_JUMP);
2990 close_dump_file (DFI_jump, print_rtl, insns);
2994 /* Perform common subexpression elimination.
2995 Nonzero value from `cse_main' means that jumps were simplified
2996 and some code may now be unreachable, so do
2997 jump optimization again. */
3001 open_dump_file (DFI_cse, decl);
3002 timevar_push (TV_CSE);
3004 reg_scan (insns, max_reg_num (), 1);
3006 if (flag_thread_jumps)
3008 timevar_push (TV_JUMP);
3009 thread_jumps (insns, max_reg_num (), 1);
3010 timevar_pop (TV_JUMP);
3013 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3015 /* If we are not running more CSE passes, then we are no longer
3016 expecting CSE to be run. But always rerun it in a cheap mode. */
3017 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
3019 if (tem || optimize > 1)
3021 timevar_push (TV_JUMP);
3022 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
3023 !JUMP_AFTER_REGSCAN);
3024 timevar_pop (TV_JUMP);
3027 /* Run this after jump optmizations remove all the unreachable code
3028 so that unreachable code will not keep values live. */
3029 delete_trivially_dead_insns (insns, max_reg_num ());
3031 /* Try to identify useless null pointer tests and delete them. */
3032 if (flag_delete_null_pointer_checks)
3034 timevar_push (TV_JUMP);
3035 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3037 cleanup_cfg (insns);
3039 delete_null_pointer_checks (insns);
3040 timevar_pop (TV_JUMP);
3043 /* The second pass of jump optimization is likely to have
3044 removed a bunch more instructions. */
3045 renumber_insns (rtl_dump_file);
3047 timevar_pop (TV_CSE);
3048 close_dump_file (DFI_cse, print_rtl, insns);
3051 open_dump_file (DFI_addressof, decl);
3053 purge_addressof (insns);
3054 reg_scan (insns, max_reg_num (), 1);
3056 close_dump_file (DFI_addressof, print_rtl, insns);
3060 if (optimize > 0 && flag_ssa)
3062 /* Convert to SSA form. */
3064 timevar_push (TV_TO_SSA);
3065 open_dump_file (DFI_ssa, decl);
3067 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3068 cleanup_cfg (insns);
3071 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
3072 timevar_pop (TV_TO_SSA);
3074 /* The SSA implementation uses basic block numbers in its phi
3075 nodes. Thus, changing the control-flow graph or the basic
3076 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
3077 may cause problems. */
3081 /* Remove dead code. */
3083 timevar_push (TV_DEAD_CODE_ELIM);
3084 open_dump_file (DFI_dce, decl);
3086 insns = get_insns ();
3087 eliminate_dead_code();
3089 close_dump_file (DFI_dce, print_rtl_with_bb, insns);
3090 timevar_pop (TV_DEAD_CODE_ELIM);
3093 /* Convert from SSA form. */
3095 timevar_push (TV_FROM_SSA);
3096 open_dump_file (DFI_ussa, decl);
3098 convert_from_ssa ();
3099 /* New registers have been created. Rescan their usage. */
3100 reg_scan (insns, max_reg_num (), 1);
3101 /* Life analysis used in SSA adds log_links but these
3102 shouldn't be there until the flow stage, so clear
3104 clear_log_links (insns);
3106 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
3107 timevar_pop (TV_FROM_SSA);
3112 /* Perform global cse. */
3114 if (optimize > 0 && flag_gcse)
3116 int save_csb, save_cfj;
3119 timevar_push (TV_GCSE);
3120 open_dump_file (DFI_gcse, decl);
3122 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3123 cleanup_cfg (insns);
3124 tem = gcse_main (insns, rtl_dump_file);
3126 save_csb = flag_cse_skip_blocks;
3127 save_cfj = flag_cse_follow_jumps;
3128 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
3130 /* If -fexpensive-optimizations, re-run CSE to clean up things done
3132 if (flag_expensive_optimizations)
3134 timevar_push (TV_CSE);
3135 reg_scan (insns, max_reg_num (), 1);
3136 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
3137 timevar_pop (TV_CSE);
3138 cse_not_expected = !flag_rerun_cse_after_loop;
3141 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
3142 things up. Then possibly re-run CSE again. */
3146 timevar_push (TV_JUMP);
3147 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
3148 !JUMP_AFTER_REGSCAN);
3149 timevar_pop (TV_JUMP);
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);
3160 close_dump_file (DFI_gcse, print_rtl, insns);
3161 timevar_pop (TV_GCSE);
3164 flag_cse_skip_blocks = save_csb;
3165 flag_cse_follow_jumps = save_cfj;
3168 /* Move constant computations out of loops. */
3172 timevar_push (TV_LOOP);
3173 open_dump_file (DFI_loop, decl);
3175 if (flag_rerun_loop_opt)
3177 /* We only want to perform unrolling once. */
3179 loop_optimize (insns, rtl_dump_file, 0);
3181 /* The first call to loop_optimize makes some instructions
3182 trivially dead. We delete those instructions now in the
3183 hope that doing so will make the heuristics in loop work
3184 better and possibly speed up compilation. */
3185 delete_trivially_dead_insns (insns, max_reg_num ());
3187 /* The regscan pass is currently necessary as the alias
3188 analysis code depends on this information. */
3189 reg_scan (insns, max_reg_num (), 1);
3191 loop_optimize (insns, rtl_dump_file,
3192 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT);
3194 close_dump_file (DFI_loop, print_rtl, insns);
3195 timevar_pop (TV_LOOP);
3202 timevar_push (TV_CSE2);
3203 open_dump_file (DFI_cse2, decl);
3205 if (flag_rerun_cse_after_loop)
3207 /* Running another jump optimization pass before the second
3208 cse pass sometimes simplifies the RTL enough to allow
3209 the second CSE pass to do a better job. Jump_optimize can change
3210 max_reg_num so we must rerun reg_scan afterwards.
3211 ??? Rework to not call reg_scan so often. */
3212 timevar_push (TV_JUMP);
3214 reg_scan (insns, max_reg_num (), 0);
3215 jump_optimize (insns, !JUMP_CROSS_JUMP,
3216 !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN);
3218 timevar_push (TV_IFCVT);
3220 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3221 cleanup_cfg (insns);
3224 timevar_pop(TV_IFCVT);
3226 timevar_pop (TV_JUMP);
3228 reg_scan (insns, max_reg_num (), 0);
3229 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3233 timevar_push (TV_JUMP);
3234 jump_optimize (insns, !JUMP_CROSS_JUMP,
3235 !JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3236 timevar_pop (TV_JUMP);
3240 if (flag_thread_jumps)
3242 /* This pass of jump threading straightens out code
3243 that was kinked by loop optimization. */
3244 timevar_push (TV_JUMP);
3245 reg_scan (insns, max_reg_num (), 0);
3246 thread_jumps (insns, max_reg_num (), 0);
3247 timevar_pop (TV_JUMP);
3250 close_dump_file (DFI_cse2, print_rtl, insns);
3251 timevar_pop (TV_CSE2);
3256 cse_not_expected = 1;
3260 /* Do control and data flow analysis; wrote some of the results to
3263 timevar_push (TV_FLOW);
3264 open_dump_file (DFI_cfg, decl);
3266 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3267 cleanup_cfg (insns);
3268 check_function_return_warnings ();
3270 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3272 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3274 timevar_push (TV_BRANCH_PROB);
3275 open_dump_file (DFI_bp, decl);
3279 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3280 timevar_pop (TV_BRANCH_PROB);
3283 open_dump_file (DFI_life, decl);
3288 /* Discover and record the loop depth at the head of each basic
3289 block. The loop infrastructure does the real job for us. */
3290 flow_loops_find (&loops, LOOP_TREE);
3292 /* Estimate using heuristics if no profiling info is available. */
3293 if (flag_guess_branch_prob)
3294 estimate_probability (&loops);
3297 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3299 flow_loops_free (&loops);
3301 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3302 mark_constant_function ();
3303 timevar_pop (TV_FLOW);
3305 register_life_up_to_date = 1;
3308 if (warn_uninitialized || extra_warnings)
3310 uninitialized_vars_warning (DECL_INITIAL (decl));
3312 setjmp_args_warning ();
3315 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3319 /* If -opt, try combining insns through substitution. */
3323 int rebuild_jump_labels_after_combine = 0;
3325 timevar_push (TV_COMBINE);
3326 open_dump_file (DFI_combine, decl);
3328 rebuild_jump_labels_after_combine
3329 = combine_instructions (insns, max_reg_num ());
3331 /* Combining insns may have turned an indirect jump into a
3332 direct jump. Rebuid the JUMP_LABEL fields of jumping
3334 if (rebuild_jump_labels_after_combine)
3336 timevar_push (TV_JUMP);
3337 rebuild_jump_labels (insns);
3338 timevar_pop (TV_JUMP);
3340 timevar_push (TV_FLOW);
3341 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3342 cleanup_cfg (insns);
3344 /* Blimey. We've got to have the CFG up to date for the call to
3345 if_convert below. However, the random deletion of blocks
3346 without updating life info can wind up with Wierd Stuff in
3347 global_live_at_end. We then run sched1, which updates things
3348 properly, discovers the wierdness and aborts. */
3349 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3350 PROP_DEATH_NOTES | PROP_KILL_DEAD_CODE
3351 | PROP_SCAN_DEAD_CODE);
3353 timevar_pop (TV_FLOW);
3356 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3357 timevar_pop (TV_COMBINE);
3362 /* Rerun if-conversion, as combine may have simplified things enough to
3363 now meet sequence length restrictions. */
3366 timevar_push (TV_IFCVT);
3367 open_dump_file (DFI_ce, decl);
3373 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3374 timevar_pop (TV_IFCVT);
3377 /* Register allocation pre-pass, to reduce number of moves
3378 necessary for two-address machines. */
3379 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3381 timevar_push (TV_REGMOVE);
3382 open_dump_file (DFI_regmove, decl);
3384 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3386 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3387 timevar_pop (TV_REGMOVE);
3392 /* Any of the several passes since flow1 will have munged register
3393 lifetime data a bit. */
3395 register_life_up_to_date = 0;
3397 #ifdef OPTIMIZE_MODE_SWITCHING
3398 timevar_push (TV_GCSE);
3400 if (optimize_mode_switching (NULL_PTR))
3402 /* We did work, and so had to regenerate global life information.
3403 Take advantage of this and don't re-recompute register life
3404 information below. */
3405 register_life_up_to_date = 1;
3408 timevar_pop (TV_GCSE);
3411 #ifdef INSN_SCHEDULING
3413 /* Print function header into sched dump now
3414 because doing the sched analysis makes some of the dump. */
3415 if (optimize > 0 && flag_schedule_insns)
3417 timevar_push (TV_SCHED);
3418 open_dump_file (DFI_sched, decl);
3420 /* Do control and data sched analysis,
3421 and write some of the results to dump file. */
3423 schedule_insns (rtl_dump_file);
3425 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3426 timevar_pop (TV_SCHED);
3430 /* Register lifetime information was updated as part of verifying
3432 register_life_up_to_date = 1;
3436 /* Determine if the current function is a leaf before running reload
3437 since this can impact optimizations done by the prologue and
3438 epilogue thus changing register elimination offsets. */
3439 current_function_is_leaf = leaf_function_p ();
3441 timevar_push (TV_LOCAL_ALLOC);
3442 open_dump_file (DFI_lreg, decl);
3444 /* Allocate pseudo-regs that are used only within 1 basic block.
3446 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3447 jump optimizer after register allocation and reloading are finished. */
3449 if (! register_life_up_to_date)
3450 recompute_reg_usage (insns, ! optimize_size);
3451 regclass (insns, max_reg_num (), rtl_dump_file);
3452 rebuild_label_notes_after_reload = local_alloc ();
3454 timevar_pop (TV_LOCAL_ALLOC);
3456 if (dump_file[DFI_lreg].enabled)
3458 timevar_push (TV_DUMP);
3460 dump_flow_info (rtl_dump_file);
3461 dump_local_alloc (rtl_dump_file);
3463 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3464 timevar_pop (TV_DUMP);
3469 timevar_push (TV_GLOBAL_ALLOC);
3470 open_dump_file (DFI_greg, decl);
3472 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3473 pass fixing up any insns that are invalid. */
3476 failure = global_alloc (rtl_dump_file);
3479 build_insn_chain (insns);
3480 failure = reload (insns, 0);
3483 timevar_pop (TV_GLOBAL_ALLOC);
3485 if (dump_file[DFI_greg].enabled)
3487 timevar_push (TV_DUMP);
3489 dump_global_regs (rtl_dump_file);
3491 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3492 timevar_pop (TV_DUMP);
3496 goto exit_rest_of_compilation;
3500 open_dump_file (DFI_postreload, decl);
3502 /* Do a very simple CSE pass over just the hard registers. */
3505 timevar_push (TV_RELOAD_CSE_REGS);
3506 reload_cse_regs (insns);
3507 timevar_pop (TV_RELOAD_CSE_REGS);
3510 /* If optimizing, then go ahead and split insns now since we are about
3511 to recompute flow information anyway. Since we can't split insns after
3512 reload, do the splitting unconditionally here to avoid gcc from losing
3520 int old_labelnum = max_label_num ();
3522 split_all_insns (0);
3523 rebuild_label_notes_after_reload |= old_labelnum != max_label_num ();
3526 /* Register allocation and reloading may have turned an indirect jump into
3527 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3528 jumping instructions. */
3529 if (rebuild_label_notes_after_reload)
3531 timevar_push (TV_JUMP);
3533 rebuild_jump_labels (insns);
3535 timevar_pop (TV_JUMP);
3538 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3540 /* Re-create the death notes which were deleted during reload. */
3541 timevar_push (TV_FLOW2);
3542 open_dump_file (DFI_flow2, decl);
3544 jump_optimize (insns, !JUMP_CROSS_JUMP,
3545 JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
3546 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3548 /* On some machines, the prologue and epilogue code, or parts thereof,
3549 can be represented as RTL. Doing so lets us schedule insns between
3550 it and the rest of the code and also allows delayed branch
3551 scheduling to operate in the epilogue. */
3552 thread_prologue_and_epilogue_insns (insns);
3556 cleanup_cfg (insns);
3557 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3559 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3560 even for machines with possibly nonzero RETURN_POPS_ARGS
3561 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3562 push instructions will have popping returns. */
3563 #ifndef PUSH_ROUNDING
3564 if (!ACCUMULATE_OUTGOING_ARGS)
3566 combine_stack_adjustments ();
3571 flow2_completed = 1;
3573 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3574 timevar_pop (TV_FLOW2);
3576 #ifdef HAVE_peephole2
3577 if (optimize > 0 && flag_peephole2)
3579 timevar_push (TV_PEEPHOLE2);
3580 open_dump_file (DFI_peephole2, decl);
3582 peephole2_optimize (rtl_dump_file);
3584 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3585 timevar_pop (TV_PEEPHOLE2);
3589 if (optimize > 0 && flag_rename_registers)
3591 timevar_push (TV_RENAME_REGISTERS);
3592 open_dump_file (DFI_rnreg, decl);
3594 regrename_optimize ();
3596 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3597 timevar_pop (TV_RENAME_REGISTERS);
3602 timevar_push (TV_IFCVT2);
3603 open_dump_file (DFI_ce2, decl);
3607 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3608 timevar_pop (TV_IFCVT2);
3611 #ifdef INSN_SCHEDULING
3612 if (optimize > 0 && flag_schedule_insns_after_reload)
3614 timevar_push (TV_SCHED2);
3615 open_dump_file (DFI_sched2, decl);
3617 /* Do control and data sched analysis again,
3618 and write some more of the results to dump file. */
3620 schedule_insns (rtl_dump_file);
3622 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3623 timevar_pop (TV_SCHED2);
3629 #ifdef LEAF_REGISTERS
3630 current_function_uses_only_leaf_regs
3631 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3634 if (optimize > 0 && flag_reorder_blocks)
3636 timevar_push (TV_REORDER_BLOCKS);
3637 open_dump_file (DFI_bbro, decl);
3639 reorder_basic_blocks ();
3641 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3642 timevar_pop (TV_REORDER_BLOCKS);
3645 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3646 Also do cross-jumping this time and delete no-op move insns. */
3650 timevar_push (TV_JUMP);
3651 open_dump_file (DFI_jump2, decl);
3653 jump_optimize (insns, JUMP_CROSS_JUMP, JUMP_NOOP_MOVES,
3654 !JUMP_AFTER_REGSCAN);
3656 /* CFG no longer kept up to date. */
3658 close_dump_file (DFI_jump2, print_rtl, insns);
3659 timevar_pop (TV_JUMP);
3662 /* If a machine dependent reorganization is needed, call it. */
3663 #ifdef MACHINE_DEPENDENT_REORG
3664 open_dump_file (DFI_mach, decl);
3666 MACHINE_DEPENDENT_REORG (insns);
3668 close_dump_file (DFI_mach, print_rtl, insns);
3673 /* If a scheduling pass for delayed branches is to be done,
3674 call the scheduling code. */
3677 if (optimize > 0 && flag_delayed_branch)
3679 timevar_push (TV_DBR_SCHED);
3680 open_dump_file (DFI_dbr, decl);
3682 dbr_schedule (insns, rtl_dump_file);
3684 close_dump_file (DFI_dbr, print_rtl, insns);
3685 timevar_pop (TV_DBR_SCHED);
3691 /* Shorten branches.
3693 Note this must run before reg-stack because of death note (ab)use
3694 in the ia32 backend. */
3695 timevar_push (TV_SHORTEN_BRANCH);
3696 shorten_branches (get_insns ());
3697 timevar_pop (TV_SHORTEN_BRANCH);
3700 timevar_push (TV_REG_STACK);
3701 open_dump_file (DFI_stack, decl);
3703 reg_to_stack (insns, rtl_dump_file);
3705 close_dump_file (DFI_stack, print_rtl, insns);
3706 timevar_pop (TV_REG_STACK);
3711 current_function_nothrow = nothrow_function_p ();
3712 if (current_function_nothrow)
3713 /* Now we know that this can't throw; set the flag for the benefit
3714 of other functions later in this translation unit. */
3715 TREE_NOTHROW (current_function_decl) = 1;
3717 /* Now turn the rtl into assembler code. */
3719 timevar_push (TV_FINAL);
3724 /* Get the function's name, as described by its RTL. This may be
3725 different from the DECL_NAME name used in the source file. */
3727 x = DECL_RTL (decl);
3728 if (GET_CODE (x) != MEM)
3731 if (GET_CODE (x) != SYMBOL_REF)
3733 fnname = XSTR (x, 0);
3735 assemble_start_function (decl, fnname);
3736 final_start_function (insns, asm_out_file, optimize);
3737 final (insns, asm_out_file, optimize, 0);
3738 final_end_function (insns, asm_out_file, optimize);
3739 assemble_end_function (decl, fnname);
3741 fflush (asm_out_file);
3743 /* Release all memory allocated by flow. */
3744 free_basic_block_vars (0);
3746 /* Release all memory held by regsets now. */
3747 regset_release_memory ();
3749 timevar_pop (TV_FINAL);
3753 /* Write DBX symbols if requested. */
3755 /* Note that for those inline functions where we don't initially
3756 know for certain that we will be generating an out-of-line copy,
3757 the first invocation of this routine (rest_of_compilation) will
3758 skip over this code by doing a `goto exit_rest_of_compilation;'.
3759 Later on, finish_compilation will call rest_of_compilation again
3760 for those inline functions that need to have out-of-line copies
3761 generated. During that call, we *will* be routed past here. */
3763 timevar_push (TV_SYMOUT);
3764 #ifdef DBX_DEBUGGING_INFO
3765 if (write_symbols == DBX_DEBUG)
3766 dbxout_function (decl);
3769 #ifdef DWARF_DEBUGGING_INFO
3770 if (write_symbols == DWARF_DEBUG)
3771 dwarfout_file_scope_decl (decl, 0);
3774 #ifdef DWARF2_DEBUGGING_INFO
3775 if (write_symbols == DWARF2_DEBUG)
3776 dwarf2out_decl (decl);
3778 timevar_pop (TV_SYMOUT);
3780 exit_rest_of_compilation:
3782 /* In case the function was not output,
3783 don't leave any temporary anonymous types
3784 queued up for sdb output. */
3785 #ifdef SDB_DEBUGGING_INFO
3786 if (write_symbols == SDB_DEBUG)
3787 sdbout_types (NULL_TREE);
3790 reload_completed = 0;
3791 flow2_completed = 0;
3794 timevar_push (TV_FINAL);
3796 /* Clear out the insn_length contents now that they are no
3798 init_insn_lengths ();
3800 /* Clear out the real_constant_chain before some of the rtx's
3801 it runs through become garbage. */
3802 clear_const_double_mem ();
3804 /* Show no temporary slots allocated. */
3807 free_basic_block_vars (0);
3809 timevar_pop (TV_FINAL);
3811 /* Make sure volatile mem refs aren't considered valid operands for
3812 arithmetic insns. We must call this here if this is a nested inline
3813 function, since the above code leaves us in the init_recog state
3814 (from final.c), and the function context push/pop code does not
3815 save/restore volatile_ok.
3817 ??? Maybe it isn't necessary for expand_start_function to call this
3818 anymore if we do it here? */
3820 init_recog_no_volatile ();
3822 /* We're done with this function. Free up memory if we can. */
3823 free_after_parsing (cfun);
3824 if (! DECL_DEFER_OUTPUT (decl))
3825 free_after_compilation (cfun);
3830 timevar_pop (TV_REST_OF_COMPILATION);
3840 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3841 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3842 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3843 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3844 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3845 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"));
3847 for (i = ARRAY_SIZE (f_options); i--;)
3849 const char *description = f_options[i].description;
3851 if (description != NULL && * description != 0)
3852 printf (" -f%-21s %s\n",
3853 f_options[i].string, description);
3856 printf (_(" -O[number] Set optimisation level to [number]\n"));
3857 printf (_(" -Os Optimise for space rather than speed\n"));
3858 printf (_(" --param <name>=<value> Set constant controlling optimization\n"));
3859 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3860 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3861 printf (_(" -w Suppress warnings\n"));
3862 printf (_(" -W Enable extra warnings\n"));
3864 for (i = ARRAY_SIZE (W_options); i--;)
3866 const char *description = W_options[i].description;
3868 if (description != NULL && * description != 0)
3869 printf (" -W%-21s %s\n",
3870 W_options[i].string, description);
3873 printf (_(" -Wunused Enable unused warnings\n"));
3874 printf (_(" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n"));
3875 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3876 printf (_(" -p Enable function profiling\n"));
3877 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3878 printf (_(" -a Enable block profiling \n"));
3880 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3881 printf (_(" -ax Enable jump profiling \n"));
3883 printf (_(" -o <file> Place output into <file> \n"));
3885 -G <number> Put global and static data smaller than <number>\n\
3886 bytes into a special section (on some targets)\n"));
3888 for (i = ARRAY_SIZE (debug_args); i--;)
3890 if (debug_args[i].description != NULL)
3891 printf (" -g%-21s %s\n",
3892 debug_args[i].arg, debug_args[i].description);
3895 printf (_(" -aux-info <file> Emit declaration info into <file>.X\n"));
3896 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3897 printf (_(" -version Display the compiler's version\n"));
3898 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3899 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3900 #if defined INSN_SCHEDULING
3901 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3903 printf (_(" --help Display this information\n"));
3908 /* Display descriptions of language specific options.
3909 If there is no description, note that there is an undocumented option.
3910 If the description is empty, do not display anything. (This allows
3911 options to be deliberately undocumented, for whatever reason).
3912 If the option string is missing, then this is a marker, indicating
3913 that the description string is in fact the name of a language, whose
3914 language specific options are to follow. */
3916 if (ARRAY_SIZE (documented_lang_options) > 1)
3918 printf (_("\nLanguage specific options:\n"));
3920 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3922 const char *description = documented_lang_options[i].description;
3923 const char *option = documented_lang_options[i].option;
3925 if (description == NULL)
3930 printf (_(" %-23.23s [undocumented]\n"), option);
3932 else if (*description == 0)
3934 else if (option == NULL)
3938 (_("\nThere are undocumented %s specific options as well.\n"),
3942 printf (_("\n Options for %s:\n"), description);
3947 printf (" %-23.23s %s\n", option, description);
3952 printf (_("\nThere are undocumented %s specific options as well.\n"),
3955 display_target_options ();
3959 display_target_options ()
3963 if (ARRAY_SIZE (target_switches) > 1
3964 #ifdef TARGET_OPTIONS
3965 || ARRAY_SIZE (target_options) > 1
3973 printf (_("\nTarget specific options:\n"));
3975 for (i = ARRAY_SIZE (target_switches); i--;)
3977 const char *option = target_switches[i].name;
3978 const char *description = target_switches[i].description;
3980 if (option == NULL || *option == 0)
3982 else if (description == NULL)
3987 printf (_(" -m%-23.23s [undocumented]\n"), option);
3989 else if (* description != 0)
3990 doc += printf (" -m%-23.23s %s\n", option, description);
3993 #ifdef TARGET_OPTIONS
3994 for (i = ARRAY_SIZE (target_options); i--;)
3996 const char *option = target_options[i].prefix;
3997 const char *description = target_options[i].description;
3999 if (option == NULL || *option == 0)
4001 else if (description == NULL)
4006 printf (_(" -m%-23.23s [undocumented]\n"), option);
4008 else if (* description != 0)
4009 doc += printf (" -m%-23.23s %s\n", option, description);
4015 printf (_("\nThere are undocumented target specific options as well.\n"));
4017 printf (_(" They exist, but they are not documented.\n"));
4022 /* Parse a -d... comand line switch. */
4025 decode_d_option (arg)
4034 for (i = 0; i < (int) DFI_MAX; ++i)
4035 dump_file[i].enabled = 1;
4044 flag_print_asm_name = 1;
4047 flag_dump_rtl_in_asm = 1;
4048 flag_print_asm_name = 1;
4051 graph_dump_format = vcg;
4054 rtl_dump_and_exit = 1;
4059 case 'D': /* These are handled by the preprocessor. */
4065 for (i = 0; i < (int) DFI_MAX; ++i)
4066 if (c == dump_file[i].debug_switch)
4068 dump_file[i].enabled = 1;
4073 warning ("unrecognized gcc debugging option: %c", c);
4078 /* Parse a -f... comand line switch. ARG is the value after the -f.
4079 It is safe to access 'ARG - 2' to generate the full switch name.
4080 Return the number of strings consumed. */
4083 decode_f_option (arg)
4087 const char *option_value = NULL;
4089 /* Search for the option in the table of binary f options. */
4090 for (j = ARRAY_SIZE (f_options); j--;)
4092 if (!strcmp (arg, f_options[j].string))
4094 *f_options[j].variable = f_options[j].on_value;
4098 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4099 && ! strcmp (arg + 3, f_options[j].string))
4101 *f_options[j].variable = ! f_options[j].on_value;
4106 if (!strcmp (arg, "fast-math"))
4107 set_fast_math_flags();
4108 else if (!strcmp (arg, "no-fast-math"))
4109 set_no_fast_math_flags();
4110 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4111 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4114 read_integral_parameter (option_value, arg - 2,
4116 set_param_value ("max-inline-insns", val);
4118 #ifdef INSN_SCHEDULING
4119 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4120 fix_sched_param ("verbose", option_value);
4122 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4123 fix_register (option_value, 1, 1);
4124 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4125 fix_register (option_value, 0, 1);
4126 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4127 fix_register (option_value, 0, 0);
4128 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4129 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4130 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4132 = read_integral_parameter (option_value, arg - 2, align_functions);
4133 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4134 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4135 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4137 = read_integral_parameter (option_value, arg - 2, align_labels);
4138 else if ((option_value
4139 = skip_leading_substring (arg, "stack-limit-register=")))
4141 int reg = decode_reg_name (option_value);
4143 error ("unrecognized register name `%s'", option_value);
4145 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4147 else if ((option_value
4148 = skip_leading_substring (arg, "stack-limit-symbol=")))
4151 nm = ggc_strdup (option_value);
4152 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4154 else if ((option_value
4155 = skip_leading_substring (arg, "message-length=")))
4156 diagnostic_message_length_per_line =
4157 read_integral_parameter (option_value, arg - 2,
4158 diagnostic_message_length_per_line);
4159 else if ((option_value
4160 = skip_leading_substring (arg, "diagnostics-show-location=")))
4162 if (!strcmp (option_value, "once"))
4163 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_ONCE);
4164 else if (!strcmp (option_value, "every-line"))
4165 set_message_prefixing_rule (DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE);
4167 error ("Unrecognized option `%s'", arg - 2);
4169 else if (!strcmp (arg, "no-stack-limit"))
4170 stack_limit_rtx = NULL_RTX;
4171 else if (!strcmp (arg, "preprocessed"))
4172 /* Recognise this switch but do nothing. This prevents warnings
4173 about an unrecognized switch if cpplib has not been linked in. */
4181 /* Parse a -W... comand line switch. ARG is the value after the -W.
4182 It is safe to access 'ARG - 2' to generate the full switch name.
4183 Return the number of strings consumed. */
4186 decode_W_option (arg)
4189 const char *option_value = NULL;
4192 /* Search for the option in the table of binary W options. */
4194 for (j = ARRAY_SIZE (W_options); j--;)
4196 if (!strcmp (arg, W_options[j].string))
4198 *W_options[j].variable = W_options[j].on_value;
4202 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4203 && ! strcmp (arg + 3, W_options[j].string))
4205 *W_options[j].variable = ! W_options[j].on_value;
4210 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4212 id_clash_len = read_integral_parameter (option_value, arg - 2, -1);
4214 if (id_clash_len != -1)
4217 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4219 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4221 warn_larger_than = larger_than_size != -1;
4223 else if (!strcmp (arg, "unused"))
4227 else if (!strcmp (arg, "no-unused"))
4237 /* Parse a -g... comand line switch. ARG is the value after the -g.
4238 It is safe to access 'ARG - 2' to generate the full switch name.
4239 Return the number of strings consumed. */
4242 decode_g_option (arg)
4246 /* A lot of code assumes write_symbols == NO_DEBUG if the
4247 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4248 of what debugging type has been selected). This records the
4249 selected type. It is an error to specify more than one
4251 static enum debug_info_type selected_debug_type = NO_DEBUG;
4252 /* Non-zero if debugging format has been explicitly set.
4253 -g and -ggdb don't explicitly set the debugging format so
4254 -gdwarf -g3 is equivalent to -gdwarf3. */
4255 static int type_explicitly_set_p = 0;
4256 /* Indexed by enum debug_info_type. */
4257 static const char *debug_type_names[] =
4259 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4262 /* The maximum admissible debug level value. */
4263 static const unsigned max_debug_level = 3;
4265 /* Look up ARG in the table. */
4266 for (da = debug_args; da->arg; da++)
4268 const int da_len = strlen (da->arg);
4270 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4272 enum debug_info_type type = da->debug_type;
4273 const char *p = arg + da_len;
4275 if (*p && (*p < '0' || *p > '9'))
4278 /* A debug flag without a level defaults to level 2.
4279 Note we do not want to call read_integral_parameter
4280 for that case since it will call atoi which
4283 ??? We may want to generalize the interface to
4284 read_integral_parameter to better handle this case
4285 if this case shows up often. */
4287 level = read_integral_parameter (p, 0, max_debug_level + 1);
4291 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4293 error ("use -gdwarf -g%d for DWARF v1, level %d",
4296 error ("use -gdwarf-2 for DWARF v2");
4299 if (level > max_debug_level)
4302 ignoring option `%s' due to invalid debug level specification",
4304 level = debug_info_level;
4307 if (type == NO_DEBUG)
4309 type = PREFERRED_DEBUGGING_TYPE;
4311 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4313 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4314 type = DWARF2_DEBUG;
4316 #ifdef DBX_DEBUGGING_INFO
4323 if (type == NO_DEBUG)
4324 warning ("`%s': unknown or unsupported -g option", arg - 2);
4326 /* Does it conflict with an already selected type? */
4327 if (type_explicitly_set_p
4328 /* -g/-ggdb don't conflict with anything. */
4329 && da->debug_type != NO_DEBUG
4330 && type != selected_debug_type)
4331 warning ("`%s' ignored, conflicts with `-g%s'",
4332 arg - 2, debug_type_names[(int) selected_debug_type]);
4335 /* If the format has already been set, -g/-ggdb
4336 only change the debug level. */
4337 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4338 /* Don't change debugging type. */
4342 selected_debug_type = type;
4343 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4346 write_symbols = (level == 0
4348 : selected_debug_type);
4349 use_gnu_debug_info_extensions = da->use_extensions_p;
4350 debug_info_level = (enum debug_info_level) level;
4363 /* Decode the first argument in the argv as a language-independent option.
4364 Return the number of strings consumed. */
4367 independent_decode_option (argc, argv)
4371 char *arg = argv[0];
4373 if (arg[0] != '-' || arg[1] == 0)
4385 if (!strcmp (arg, "-help"))
4388 exit_after_options = 1;
4391 if (!strcmp (arg, "-target-help"))
4393 display_target_options ();
4394 exit_after_options = 1;
4397 if (!strcmp (arg, "-version"))
4399 print_version (stderr, "");
4400 exit_after_options = 1;
4403 /* Handle '--param <name>=<value>'. */
4404 if (strcmp (arg, "-param") == 0)
4410 error ("-param option missing argument");
4414 /* Get the '<name>=<value>' parameter. */
4416 /* Look for the `='. */
4417 equal = strchr (arg, '=');
4419 error ("invalid --param option: %s", arg);
4424 /* Zero out the `=' sign so that we get two separate strings. */
4426 /* Figure out what value is specified. */
4427 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4428 if (val != INVALID_PARAM_VAL)
4429 set_param_value (arg, val);
4431 error ("invalid parameter value `%s'", equal + 1);
4446 /* Already been treated in main (). Do nothing. */
4450 set_target_switch (arg + 1);
4454 return decode_f_option (arg + 1);
4457 return decode_g_option (arg + 1);
4460 if (!strcmp (arg, "dumpbase"))
4465 dump_base_name = argv[1];
4469 decode_d_option (arg + 1);
4473 if (!strcmp (arg, "pedantic"))
4475 else if (!strcmp (arg, "pedantic-errors"))
4476 flag_pedantic_errors = pedantic = 1;
4477 else if (arg[1] == 0)
4484 if (!strcmp (arg, "quiet"))
4491 if (!strcmp (arg, "version"))
4499 inhibit_warnings = 1;
4508 /* We save the value of warn_uninitialized, since if they put
4509 -Wuninitialized on the command line, we need to generate a
4510 warning about not using it without also specifying -O. */
4511 if (warn_uninitialized != 1)
4512 warn_uninitialized = 2;
4515 return decode_W_option (arg + 1);
4521 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4522 warning ("`-a' option (basic block profile) not supported");
4524 profile_block_flag = (profile_block_flag < 2) ? 1 : 3;
4527 else if (!strcmp (arg, "ax"))
4529 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4530 warning ("`-ax' option (jump profiling) not supported");
4532 profile_block_flag = (!profile_block_flag
4533 || profile_block_flag == 2) ? 2 : 3;
4536 else if (!strncmp (arg, "aux-info", 8))
4538 flag_gen_aux_info = 1;
4544 aux_info_file_name = argv[1];
4548 aux_info_file_name = arg + 8;
4560 asm_file_name = argv[1];
4575 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4580 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4584 if (g_switch_val == -1)
4588 g_switch_set = TRUE;
4589 g_switch_value = g_switch_val;
4599 /* Entry point of cc1, cc1plus, jc1, f771, etc.
4600 Decode command args, then call compile_file.
4601 Exit code is FATAL_EXIT_CODE if can't open files or if there were
4602 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
4604 It is not safe to call this function more than once. */
4607 toplev_main (argc, argv)
4614 /* save in case md file wants to emit args as a comment. */
4618 p = argv[0] + strlen (argv[0]);
4619 while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
4623 xmalloc_set_program_name (progname);
4625 /* LC_CTYPE determines the character set used by the terminal so it has be set
4626 to output messages correctly. */
4628 #ifdef HAVE_LC_MESSAGES
4629 setlocale (LC_CTYPE, "");
4630 setlocale (LC_MESSAGES, "");
4632 setlocale (LC_ALL, "");
4635 (void) bindtextdomain (PACKAGE, localedir);
4636 (void) textdomain (PACKAGE);
4638 /* Install handler for SIGFPE, which may be received while we do
4639 compile-time floating point arithmetic. */
4640 signal (SIGFPE, float_signal);
4642 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4644 signal (SIGSEGV, crash_signal);
4647 signal (SIGILL, crash_signal);
4650 signal (SIGBUS, crash_signal);
4653 signal (SIGABRT, crash_signal);
4655 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4656 signal (SIGIOT, crash_signal);
4659 decl_printable_name = decl_name;
4660 lang_expand_expr = (lang_expand_expr_t) do_abort;
4662 /* Initialize whether `char' is signed. */
4663 flag_signed_char = DEFAULT_SIGNED_CHAR;
4664 #ifdef DEFAULT_SHORT_ENUMS
4665 /* Initialize how much space enums occupy, by default. */
4666 flag_short_enums = DEFAULT_SHORT_ENUMS;
4669 /* Initialize the garbage-collector. */
4672 ggc_add_rtx_root (&stack_limit_rtx, 1);
4673 ggc_add_tree_root (¤t_function_decl, 1);
4674 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4676 /* Initialize the diagnostics reporting machinery. */
4677 initialize_diagnostics ();
4679 /* Register the language-independent parameters. */
4680 add_params (lang_independent_params, LAST_PARAM);
4682 /* Perform language-specific options intialization. */
4683 if (lang_hooks.init_options)
4684 (*lang_hooks.init_options) ();
4686 /* Scan to see what optimization level has been specified. That will
4687 determine the default value of many flags. */
4688 for (i = 1; i < argc; i++)
4690 if (!strcmp (argv[i], "-O"))
4695 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4697 /* Handle -Os, -O2, -O3, -O69, ... */
4698 char *p = &argv[i][2];
4700 if ((p[0] == 's') && (p[1] == 0))
4704 /* Optimizing for size forces optimize to be 2. */
4709 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4710 if (optimize_val != -1)
4712 optimize = optimize_val;
4722 flag_thread_jumps = 1;
4724 flag_delayed_branch = 1;
4726 #ifdef CAN_DEBUG_WITHOUT_FP
4727 flag_omit_frame_pointer = 1;
4729 flag_guess_branch_prob = 1;
4734 flag_optimize_sibling_calls = 1;
4735 flag_cse_follow_jumps = 1;
4736 flag_cse_skip_blocks = 1;
4738 flag_expensive_optimizations = 1;
4739 flag_strength_reduce = 1;
4740 flag_rerun_cse_after_loop = 1;
4741 flag_rerun_loop_opt = 1;
4742 flag_caller_saves = 1;
4745 #ifdef INSN_SCHEDULING
4746 flag_schedule_insns = 1;
4747 flag_schedule_insns_after_reload = 1;
4750 flag_strict_aliasing = 1;
4751 flag_delete_null_pointer_checks = 1;
4752 flag_reorder_blocks = 1;
4757 flag_inline_functions = 1;
4758 flag_rename_registers = 1;
4761 if (optimize < 2 || optimize_size)
4766 align_functions = 1;
4769 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4772 set_target_switch ("");
4774 /* Unwind tables are always present in an ABI-conformant IA-64
4775 object file, so the default should be ON. */
4776 #ifdef IA64_UNWIND_INFO
4777 flag_unwind_tables = IA64_UNWIND_INFO;
4780 #ifdef OPTIMIZATION_OPTIONS
4781 /* Allow default optimizations to be specified on a per-machine basis. */
4782 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4785 /* Initialize register usage now so switches may override. */
4788 /* Perform normal command line switch decoding. */
4789 for (i = 1; i < argc;)
4791 unsigned int lang_processed;
4792 unsigned int indep_processed;
4794 /* Give the language a chance to decode the option for itself. */
4795 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4797 /* Now see if the option also has a language independent meaning.
4798 Some options are both language specific and language independent,
4800 indep_processed = independent_decode_option (argc - i, argv + i);
4802 if (lang_processed || indep_processed)
4803 i += MAX (lang_processed, indep_processed);
4806 const char *option = NULL;
4807 const char *lang = NULL;
4810 /* It is possible that the command line switch is not valid for the
4811 current language, but it is valid for another language. In order
4812 to be compatible with previous versions of the compiler (which
4813 did not issue an error message in this case) we check for this
4814 possibility here. If we do find a match, then if extra_warnings
4815 is set we generate a warning message, otherwise we will just
4816 ignore the option. */
4817 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4819 option = documented_lang_options[j].option;
4822 lang = documented_lang_options[j].description;
4823 else if (! strncmp (argv[i], option, strlen (option)))
4827 if (j != ARRAY_SIZE (documented_lang_options))
4831 warning ("Ignoring command line option '%s'", argv[i]);
4834 ("(It is valid for %s but not the selected language)",
4838 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4839 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4841 error ("Unrecognized option `%s'", argv[i]);
4847 /* All command line options have been processed. */
4848 if (lang_hooks.post_options)
4849 (*lang_hooks.post_options) ();
4851 if (exit_after_options)
4854 /* Reflect any language-specific diagnostic option setting. */
4855 reshape_diagnostic_buffer ();
4857 /* Checker uses the frame pointer. */
4858 if (flag_check_memory_usage)
4859 flag_omit_frame_pointer = 0;
4863 /* Inlining does not work if not optimizing,
4864 so force it not to be done. */
4868 /* The c_decode_option function and decode_option hook set
4869 this to `2' if -Wall is used, so we can avoid giving out
4870 lots of errors for people who don't realize what -Wall does. */
4871 if (warn_uninitialized == 1)
4872 warning ("-Wuninitialized is not supported without -O");
4875 #ifdef OVERRIDE_OPTIONS
4876 /* Some machines may reject certain combinations of options. */
4880 if (exceptions_via_longjmp == 2)
4882 #ifdef DWARF2_UNWIND_INFO
4883 exceptions_via_longjmp = ! DWARF2_UNWIND_INFO;
4885 #ifdef IA64_UNWIND_INFO
4886 exceptions_via_longjmp = ! IA64_UNWIND_INFO;
4888 exceptions_via_longjmp = 1;
4893 /* Since each function gets its own handler data, we can't support the
4894 new model currently, since it depend on a specific rethrow label
4895 which is declared at the front of the table, and we can only
4896 have one such symbol in a file. */
4897 #ifdef IA64_UNWIND_INFO
4898 flag_new_exceptions = 0;
4901 /* Set up the align_*_log variables, defaulting them to 1 if they
4902 were still unset. */
4903 if (align_loops <= 0) align_loops = 1;
4904 align_loops_log = floor_log2 (align_loops * 2 - 1);
4905 if (align_jumps <= 0) align_jumps = 1;
4906 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4907 if (align_labels <= 0) align_labels = 1;
4908 align_labels_log = floor_log2 (align_labels * 2 - 1);
4909 if (align_functions <= 0) align_functions = 1;
4910 align_functions_log = floor_log2 (align_functions * 2 - 1);
4912 if (profile_block_flag == 3)
4914 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4915 profile_block_flag = 2;
4918 /* Unrolling all loops implies that standard loop unrolling must also
4920 if (flag_unroll_all_loops)
4921 flag_unroll_loops = 1;
4922 /* Loop unrolling requires that strength_reduction be on also. Silently
4923 turn on strength reduction here if it isn't already on. Also, the loop
4924 unrolling code assumes that cse will be run after loop, so that must
4925 be turned on also. */
4926 if (flag_unroll_loops)
4928 flag_strength_reduce = 1;
4929 flag_rerun_cse_after_loop = 1;
4932 /* Warn about options that are not supported on this machine. */
4933 #ifndef INSN_SCHEDULING
4934 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4935 warning ("instruction scheduling not supported on this target machine");
4938 if (flag_delayed_branch)
4939 warning ("this target machine does not have delayed branches");
4942 user_label_prefix = USER_LABEL_PREFIX;
4943 if (flag_leading_underscore != -1)
4945 /* If the default prefix is more complicated than "" or "_",
4946 issue a warning and ignore this option. */
4947 if (user_label_prefix[0] == 0 ||
4948 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4950 user_label_prefix = flag_leading_underscore ? "_" : "";
4953 warning ("-f%sleading-underscore not supported on this target machine",
4954 flag_leading_underscore ? "" : "no-");
4957 /* If we are in verbose mode, write out the version and maybe all the
4958 option flags in use. */
4961 print_version (stderr, "");
4963 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4966 compile_file (filename);
4968 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4971 char *lim = (char *) sbrk (0);
4973 fnotice (stderr, "Data size %ld.\n", (long) (lim - (char *) &environ));
4978 system ("ps -l 1>&2");
4981 #endif /* not USG */
4984 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4987 return (FATAL_EXIT_CODE);
4989 return (FATAL_EXIT_CODE);
4990 return (SUCCESS_EXIT_CODE);
4993 /* Decode -m switches. */
4994 /* Decode the switch -mNAME. */
4997 set_target_switch (name)
5001 int valid_target_option = 0;
5003 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5004 if (!strcmp (target_switches[j].name, name))
5006 if (target_switches[j].value < 0)
5007 target_flags &= ~-target_switches[j].value;
5009 target_flags |= target_switches[j].value;
5010 valid_target_option = 1;
5013 #ifdef TARGET_OPTIONS
5014 if (!valid_target_option)
5015 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5017 int len = strlen (target_options[j].prefix);
5018 if (!strncmp (target_options[j].prefix, name, len))
5020 *target_options[j].variable = name + len;
5021 valid_target_option = 1;
5026 if (!valid_target_option)
5027 error ("Invalid option `%s'", name);
5030 /* Print version information to FILE.
5031 Each line begins with INDENT (for the case where FILE is the
5032 assembler output file). */
5035 print_version (file, indent)
5040 #define __VERSION__ "[?]"
5044 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
5046 "%s%s%s version %s (%s) compiled by CC.\n"
5048 , indent, *indent != 0 ? " " : "",
5049 language_string, version_string, TARGET_NAME,
5050 indent, __VERSION__);
5053 /* Print an option value and return the adjusted position in the line.
5054 ??? We don't handle error returns from fprintf (disk full); presumably
5055 other code will catch a disk full though. */
5058 print_single_switch (file, pos, max, indent, sep, term, type, name)
5061 const char *indent, *sep, *term, *type, *name;
5063 /* The ultrix fprintf returns 0 on success, so compute the result we want
5064 here since we need it for the following test. */
5065 int len = strlen (sep) + strlen (type) + strlen (name);
5070 fprintf (file, "%s", term);
5075 fprintf (file, "%s", indent);
5076 pos = strlen (indent);
5078 fprintf (file, "%s%s%s", sep, type, name);
5083 /* Print active target switches to FILE.
5084 POS is the current cursor position and MAX is the size of a "line".
5085 Each line begins with INDENT and ends with TERM.
5086 Each switch is separated from the next by SEP. */
5089 print_switch_values (file, pos, max, indent, sep, term)
5092 const char *indent, *sep, *term;
5097 /* Print the options as passed. */
5099 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
5100 _("options passed: "), "");
5102 for (p = &save_argv[1]; *p != NULL; p++)
5106 if (strcmp (*p, "-o") == 0)
5112 if (strcmp (*p, "-quiet") == 0)
5114 if (strcmp (*p, "-version") == 0)
5119 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
5122 fprintf (file, "%s", term);
5124 /* Print the -f and -m options that have been enabled.
5125 We don't handle language specific options but printing argv
5128 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
5129 _("options enabled: "), "");
5131 for (j = 0; j < ARRAY_SIZE (f_options); j++)
5132 if (*f_options[j].variable == f_options[j].on_value)
5133 pos = print_single_switch (file, pos, max, indent, sep, term,
5134 "-f", f_options[j].string);
5136 /* Print target specific options. */
5138 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
5139 if (target_switches[j].name[0] != '\0'
5140 && target_switches[j].value > 0
5141 && ((target_switches[j].value & target_flags)
5142 == target_switches[j].value))
5144 pos = print_single_switch (file, pos, max, indent, sep, term,
5145 "-m", target_switches[j].name);
5148 #ifdef TARGET_OPTIONS
5149 for (j = 0; j < ARRAY_SIZE (target_options); j++)
5150 if (*target_options[j].variable != NULL)
5153 sprintf (prefix, "-m%s", target_options[j].prefix);
5154 pos = print_single_switch (file, pos, max, indent, sep, term,
5155 prefix, *target_options[j].variable);
5159 fprintf (file, "%s", term);
5162 /* Record the beginning of a new source file, named FILENAME. */
5165 debug_start_source_file (filename)
5166 register const char *filename ATTRIBUTE_UNUSED;
5168 #ifdef DBX_DEBUGGING_INFO
5169 if (write_symbols == DBX_DEBUG)
5170 dbxout_start_new_source_file (filename);
5172 #ifdef DWARF_DEBUGGING_INFO
5173 if (debug_info_level == DINFO_LEVEL_VERBOSE
5174 && write_symbols == DWARF_DEBUG)
5175 dwarfout_start_new_source_file (filename);
5176 #endif /* DWARF_DEBUGGING_INFO */
5177 #ifdef DWARF2_DEBUGGING_INFO
5178 if (write_symbols == DWARF2_DEBUG)
5179 dwarf2out_start_source_file (filename);
5180 #endif /* DWARF2_DEBUGGING_INFO */
5181 #ifdef SDB_DEBUGGING_INFO
5182 if (write_symbols == SDB_DEBUG)
5183 sdbout_start_new_source_file (filename);
5187 /* Record the resumption of a source file. LINENO is the line number in
5188 the source file we are returning to. */
5191 debug_end_source_file (lineno)
5192 register unsigned lineno ATTRIBUTE_UNUSED;
5194 #ifdef DBX_DEBUGGING_INFO
5195 if (write_symbols == DBX_DEBUG)
5196 dbxout_resume_previous_source_file ();
5198 #ifdef DWARF_DEBUGGING_INFO
5199 if (debug_info_level == DINFO_LEVEL_VERBOSE
5200 && write_symbols == DWARF_DEBUG)
5201 dwarfout_resume_previous_source_file (lineno);
5202 #endif /* DWARF_DEBUGGING_INFO */
5203 #ifdef DWARF2_DEBUGGING_INFO
5204 if (write_symbols == DWARF2_DEBUG)
5205 dwarf2out_end_source_file ();
5206 #endif /* DWARF2_DEBUGGING_INFO */
5207 #ifdef SDB_DEBUGGING_INFO
5208 if (write_symbols == SDB_DEBUG)
5209 sdbout_resume_previous_source_file ();
5213 /* Called from cb_define in c-lex.c. The `buffer' parameter contains
5214 the tail part of the directive line, i.e. the part which is past the
5215 initial whitespace, #, whitespace, directive-name, whitespace part. */
5218 debug_define (lineno, buffer)
5219 register unsigned lineno ATTRIBUTE_UNUSED;
5220 register const char *buffer ATTRIBUTE_UNUSED;
5222 #ifdef DWARF_DEBUGGING_INFO
5223 if (write_symbols == DWARF_DEBUG)
5224 dwarfout_define (lineno, buffer);
5225 #endif /* DWARF_DEBUGGING_INFO */
5226 #ifdef DWARF2_DEBUGGING_INFO
5227 if (write_symbols == DWARF2_DEBUG)
5228 dwarf2out_define (lineno, buffer);
5229 #endif /* DWARF2_DEBUGGING_INFO */
5232 /* Called from cb_undef in c-lex.c. The `buffer' parameter contains
5233 the tail part of the directive line, i.e. the part which is past the
5234 initial whitespace, #, whitespace, directive-name, whitespace part. */
5237 debug_undef (lineno, buffer)
5238 register unsigned lineno ATTRIBUTE_UNUSED;
5239 register const char *buffer ATTRIBUTE_UNUSED;
5241 #ifdef DWARF_DEBUGGING_INFO
5242 if (write_symbols == DWARF_DEBUG)
5243 dwarfout_undef (lineno, buffer);
5244 #endif /* DWARF_DEBUGGING_INFO */
5245 #ifdef DWARF2_DEBUGGING_INFO
5246 if (write_symbols == DWARF2_DEBUG)
5247 dwarf2out_undef (lineno, buffer);
5248 #endif /* DWARF2_DEBUGGING_INFO */
5251 /* Returns nonzero if it is appropriate not to emit any debugging
5252 information for BLOCK, because it doesn't contain any instructions.
5253 This may not be the case for blocks containing nested functions, since
5254 we may actually call such a function even though the BLOCK information
5258 debug_ignore_block (block)
5259 tree block ATTRIBUTE_UNUSED;
5261 /* Never delete the BLOCK for the outermost scope
5262 of the function; we can refer to names from
5263 that scope even if the block notes are messed up. */
5264 if (is_body_block (block))
5267 #ifdef DWARF2_DEBUGGING_INFO
5268 if (write_symbols == DWARF2_DEBUG)
5269 return dwarf2out_ignore_block (block);