1 /* Top level of GNU C compiler
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 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-codes.h"
49 #include "insn-config.h"
57 #include "basic-block.h"
64 #ifndef ACCUMULATE_OUTGOING_ARGS
65 #define ACCUMULATE_OUTGOING_ARGS 0
68 #ifdef DWARF_DEBUGGING_INFO
72 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
73 #include "dwarf2out.h"
76 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
80 #ifdef SDB_DEBUGGING_INFO
84 #ifdef XCOFF_DEBUGGING_INFO
89 /* 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");
106 #define fopen vms_fopen
109 #ifndef DEFAULT_GDB_EXTENSIONS
110 #define DEFAULT_GDB_EXTENSIONS 1
113 /* If more than one debugging type is supported, you must define
114 PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
116 This is one long line cause VAXC can't handle a \-newline. */
117 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO))
118 #ifndef PREFERRED_DEBUGGING_TYPE
119 You Lose! You must define PREFERRED_DEBUGGING_TYPE!
120 #endif /* no PREFERRED_DEBUGGING_TYPE */
121 #else /* Only one debugging format supported. Define PREFERRED_DEBUGGING_TYPE
122 so the following code needn't care. */
123 #ifdef DBX_DEBUGGING_INFO
124 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
126 #ifdef SDB_DEBUGGING_INFO
127 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
129 #ifdef DWARF_DEBUGGING_INFO
130 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
132 #ifdef DWARF2_DEBUGGING_INFO
133 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
135 #ifdef XCOFF_DEBUGGING_INFO
136 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
138 #endif /* More than one debugger format enabled. */
140 /* If still not defined, must have been because no debugging formats
142 #ifndef PREFERRED_DEBUGGING_TYPE
143 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
146 #ifdef NEED_DECLARATION_ENVIRON
147 extern char **environ;
150 /* Carry information from ASM_DECLARE_OBJECT_NAME
151 to ASM_FINISH_DECLARE_OBJECT. */
153 extern int size_directive_output;
154 extern tree last_assemble_variable_decl;
156 static void set_target_switch PARAMS ((const char *));
157 static const char *decl_name PARAMS ((tree, int));
159 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
160 static void pipe_closed PARAMS ((int)) ATTRIBUTE_NORETURN;
161 #ifdef ASM_IDENTIFY_LANGUAGE
162 /* This might or might not be used in ASM_IDENTIFY_LANGUAGE. */
163 static void output_lang_identify PARAMS ((FILE *)) ATTRIBUTE_UNUSED;
165 static void compile_file PARAMS ((char *));
166 static void display_help PARAMS ((void));
167 static void mark_file_stack PARAMS ((void *));
169 static void decode_d_option PARAMS ((const char *));
170 static int decode_f_option PARAMS ((const char *));
171 static int decode_W_option PARAMS ((const char *));
172 static int decode_g_option PARAMS ((const char *));
173 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 main. */
194 /* Name of current original source file (what was input to cpp).
195 This comes from each #-command in the actual input. */
197 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 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. */
281 /* Describes all the dump files. Should be kept in order of the
282 pass and in sync with dump_file_index above. */
284 struct dump_file_info dump_file[DFI_MAX] =
286 { "rtl", 'r', 0, 0, 0 },
287 { "jump", 'j', 0, 0, 0 },
288 { "cse", 's', 0, 0, 0 },
289 { "addressof", 'F', 0, 0, 0 },
290 { "ssa", 'e', 1, 0, 0 },
291 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
292 { "gcse", 'G', 1, 0, 0 },
293 { "loop", 'L', 1, 0, 0 },
294 { "cse2", 't', 1, 0, 0 },
295 { "bp", 'b', 1, 0, 0 },
296 { "flow", 'f', 1, 0, 0 },
297 { "combine", 'c', 1, 0, 0 },
298 { "regmove", 'N', 1, 0, 0 },
299 { "sched", 'S', 1, 0, 0 },
300 { "lreg", 'l', 1, 0, 0 },
301 { "greg", 'g', 1, 0, 0 },
302 { "flow2", 'w', 1, 0, 0 },
303 { "peephole2", 'z', 1, 0, 0 },
304 { "sched2", 'R', 1, 0, 0 },
305 { "bbro", 'B', 1, 0, 0 },
306 { "rnreg", 'n', 1, 0, 0 },
307 { "jump2", 'J', 1, 0, 0 },
308 { "mach", 'M', 1, 0, 0 },
309 { "dbr", 'd', 0, 0, 0 },
310 { "stack", 'k', 1, 0, 0 },
313 static int open_dump_file PARAMS ((enum dump_file_index, tree));
314 static void close_dump_file PARAMS ((enum dump_file_index,
315 void (*) (FILE *, rtx), rtx));
317 /* Other flags saying which kinds of debugging dump have been requested. */
319 int rtl_dump_and_exit;
320 int flag_print_asm_name;
321 static int flag_print_mem;
322 static int version_flag;
323 static char * filename;
324 enum graph_dump_types graph_dump_format;
326 /* Name for output file of assembly code, specified with -o. */
330 /* Value of the -G xx switch, and whether it was passed or not. */
334 /* Type(s) of debugging information we are producing (if any).
335 See flags.h for the definitions of the different possible
336 types of debugging information. */
337 enum debug_info_type write_symbols = NO_DEBUG;
339 /* Level of debugging information we are producing. See flags.h
340 for the definitions of the different possible levels. */
341 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
343 /* Nonzero means use GNU-only extensions in the generated symbolic
344 debugging information. */
345 /* Currently, this only has an effect when write_symbols is set to
346 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
347 int use_gnu_debug_info_extensions = 0;
349 /* Nonzero means do optimizations. -O.
350 Particular numeric values stand for particular amounts of optimization;
351 thus, -O2 stores 2 here. However, the optimizations beyond the basic
352 ones are not controlled directly by this variable. Instead, they are
353 controlled by individual `flag_...' variables that are defaulted
354 based on this variable. */
358 /* Nonzero means optimize for size. -Os.
359 The only valid values are zero and non-zero. When optimize_size is
360 non-zero, optimize defaults to 2, but certain individual code
361 bloating optimizations are disabled. */
363 int optimize_size = 0;
365 /* Number of error messages and warning messages so far. */
368 int warningcount = 0;
371 /* The FUNCTION_DECL for the function currently being compiled,
372 or 0 if between functions. */
373 tree current_function_decl;
375 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
377 tree current_function_func_begin_label;
379 /* Pointer to function to compute the name to use to print a declaration.
380 DECL is the declaration in question.
381 VERBOSITY determines what information will be printed:
382 0: DECL_NAME, demangled as necessary.
383 1: and scope information.
384 2: and any other information that might be interesting, such as function
385 parameter types in C++. */
387 const char *(*decl_printable_name) PARAMS ((tree, int));
389 /* Pointer to function to compute rtl for a language-specific tree code. */
391 typedef rtx (*lang_expand_expr_t)
392 PARAMS ((union tree_node *, rtx, enum machine_mode,
393 enum expand_modifier modifier));
395 lang_expand_expr_t lang_expand_expr = 0;
397 tree (*lang_expand_constant) PARAMS ((tree)) = 0;
399 /* Pointer to function to finish handling an incomplete decl at the
400 end of compilation. */
402 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
404 /* Nonzero if generating code to do profiling. */
406 int profile_flag = 0;
408 /* Nonzero if generating code to do profiling on a line-by-line basis. */
410 int profile_block_flag;
412 /* Nonzero if generating code to profile program flow graph arcs. */
414 int profile_arc_flag = 0;
416 /* Nonzero if generating info for gcov to calculate line test coverage. */
418 int flag_test_coverage = 0;
420 /* Nonzero indicates that branch taken probabilities should be calculated. */
422 int flag_branch_probabilities = 0;
424 /* Nonzero if basic blocks should be reordered. */
426 int flag_reorder_blocks = 0;
428 /* Nonzero if registers should be renamed */
430 int flag_rename_registers = 0;
432 /* Nonzero for -pedantic switch: warn about anything
433 that standard spec forbids. */
437 /* Temporarily suppress certain warnings.
438 This is set while reading code from a system header file. */
440 int in_system_header = 0;
442 /* Don't print functions as they are compiled and don't print
443 times taken by the various passes. -quiet. */
449 /* Nonzero means `char' should be signed. */
451 int flag_signed_char;
453 /* Nonzero means give an enum type only as many bytes as it needs. */
455 int flag_short_enums;
457 /* Nonzero for -fcaller-saves: allocate values in regs that need to
458 be saved across function calls, if that produces overall better code.
459 Optional now, so people can test it. */
461 #ifdef DEFAULT_CALLER_SAVES
462 int flag_caller_saves = 1;
464 int flag_caller_saves = 0;
467 /* Nonzero if structures and unions should be returned in memory.
469 This should only be defined if compatibility with another compiler or
470 with an ABI is needed, because it results in slower code. */
472 #ifndef DEFAULT_PCC_STRUCT_RETURN
473 #define DEFAULT_PCC_STRUCT_RETURN 1
476 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
478 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
480 /* Nonzero for -fforce-mem: load memory value into a register
481 before arithmetic on it. This makes better cse but slower compilation. */
483 int flag_force_mem = 0;
485 /* Nonzero for -fforce-addr: load memory address into a register before
486 reference to memory. This makes better cse but slower compilation. */
488 int flag_force_addr = 0;
490 /* Nonzero for -fdefer-pop: don't pop args after each function call;
491 instead save them up to pop many calls' args with one insns. */
493 int flag_defer_pop = 0;
495 /* Nonzero for -ffloat-store: don't allocate floats and doubles
496 in extended-precision registers. */
498 int flag_float_store = 0;
500 /* Nonzero for -fcse-follow-jumps:
501 have cse follow jumps to do a more extensive job. */
503 int flag_cse_follow_jumps;
505 /* Nonzero for -fcse-skip-blocks:
506 have cse follow a branch around a block. */
507 int flag_cse_skip_blocks;
509 /* Nonzero for -fexpensive-optimizations:
510 perform miscellaneous relatively-expensive optimizations. */
511 int flag_expensive_optimizations;
513 /* Nonzero for -fthread-jumps:
514 have jump optimize output of loop. */
516 int flag_thread_jumps;
518 /* Nonzero enables strength-reduction in loop.c. */
520 int flag_strength_reduce = 0;
522 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
523 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
524 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
527 int flag_unroll_loops;
529 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
530 This is generally not a win. */
532 int flag_unroll_all_loops;
534 /* Nonzero forces all invariant computations in loops to be moved
537 int flag_move_all_movables = 0;
539 /* Nonzero forces all general induction variables in loops to be
542 int flag_reduce_all_givs = 0;
544 /* Nonzero to perform full register move optimization passes. This is the
547 int flag_regmove = 0;
549 /* Nonzero for -fwritable-strings:
550 store string constants in data segment and don't uniquize them. */
552 int flag_writable_strings = 0;
554 /* Nonzero means don't put addresses of constant functions in registers.
555 Used for compiling the Unix kernel, where strange substitutions are
556 done on the assembly output. */
558 int flag_no_function_cse = 0;
560 /* Nonzero for -fomit-frame-pointer:
561 don't make a frame pointer in simple functions that don't require one. */
563 int flag_omit_frame_pointer = 0;
565 /* Nonzero means place each function into its own section on those platforms
566 which support arbitrary section names and unlimited numbers of sections. */
568 int flag_function_sections = 0;
570 /* ... and similar for data. */
572 int flag_data_sections = 0;
574 /* Nonzero to inhibit use of define_optimization peephole opts. */
576 int flag_no_peephole = 0;
578 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
579 operations in the interest of optimization. For example it allows
580 GCC to assume arguments to sqrt are nonnegative numbers, allowing
581 faster code for sqrt to be generated. */
583 int flag_fast_math = 0;
585 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
587 int flag_optimize_sibling_calls = 0;
589 /* Nonzero means the front end generally wants `errno' maintained by math
590 operations, like built-in SQRT, unless overridden by flag_fast_math. */
592 int flag_errno_math = 1;
594 /* 0 means straightforward implementation of complex divide acceptable.
595 1 means wide ranges of inputs must work for complex divide.
596 2 means C9X-like requirements for complex divide (not yet implemented). */
598 int flag_complex_divide_method = 0;
600 /* Nonzero means all references through pointers are volatile. */
604 /* Nonzero means treat all global and extern variables as volatile. */
606 int flag_volatile_global;
608 /* Nonzero means treat all static variables as volatile. */
610 int flag_volatile_static;
612 /* Nonzero means just do syntax checking; don't output anything. */
614 int flag_syntax_only = 0;
616 /* Nonzero means perform global cse. */
618 static int flag_gcse;
620 /* Nonzero means to use global dataflow analysis to eliminate
621 useless null pointer tests. */
623 static int flag_delete_null_pointer_checks;
625 /* Nonzero means to rerun cse after loop optimization. This increases
626 compilation time about 20% and picks up a few more common expressions. */
628 static int flag_rerun_cse_after_loop;
630 /* Nonzero means to run loop optimizations twice. */
632 int flag_rerun_loop_opt;
634 /* Nonzero for -finline-functions: ok to inline functions that look like
635 good inline candidates. */
637 int flag_inline_functions;
639 /* Nonzero for -fkeep-inline-functions: even if we make a function
640 go inline everywhere, keep its definition around for debugging
643 int flag_keep_inline_functions;
645 /* Nonzero means that functions will not be inlined. */
649 /* Nonzero means that we should emit static const variables
650 regardless of whether or not optimization is turned on. */
652 int flag_keep_static_consts = 1;
654 /* Nonzero means we should be saving declaration info into a .X file. */
656 int flag_gen_aux_info = 0;
658 /* Specified name of aux-info file. */
660 static char *aux_info_file_name;
662 /* Nonzero means make the text shared if supported. */
664 int flag_shared_data;
666 /* Nonzero means schedule into delayed branch slots if supported. */
668 int flag_delayed_branch;
670 /* Nonzero if we are compiling pure (sharable) code.
671 Value is 1 if we are doing reasonable (i.e. simple
672 offset into offset table) pic. Value is 2 if we can
673 only perform register offsets. */
677 /* Nonzero means generate extra code for exception handling and enable
678 exception handling. */
682 /* Nonzero means use the new model for exception handling. Replaces
683 -DNEW_EH_MODEL as a compile option. */
685 int flag_new_exceptions = 1;
687 /* Nonzero means generate frame unwind info table when supported */
689 int flag_unwind_tables = 0;
691 /* Nonzero means don't place uninitialized global data in common storage
696 /* Nonzero means pretend it is OK to examine bits of target floats,
697 even if that isn't true. The resulting code will have incorrect constants,
698 but the same series of instructions that the native compiler would make. */
700 int flag_pretend_float;
702 /* Nonzero means change certain warnings into errors.
703 Usually these are warnings about failure to conform to some standard. */
705 int flag_pedantic_errors = 0;
707 /* flag_schedule_insns means schedule insns within basic blocks (before
709 flag_schedule_insns_after_reload means schedule insns after
712 int flag_schedule_insns = 0;
713 int flag_schedule_insns_after_reload = 0;
715 /* The following flags have effect only for scheduling before register
718 flag_schedule_interblock means schedule insns accross basic blocks.
719 flag_schedule_speculative means allow speculative motion of non-load insns.
720 flag_schedule_speculative_load means allow speculative motion of some
722 flag_schedule_speculative_load_dangerous allows speculative motion of more
725 int flag_schedule_interblock = 1;
726 int flag_schedule_speculative = 1;
727 int flag_schedule_speculative_load = 0;
728 int flag_schedule_speculative_load_dangerous = 0;
730 /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
731 by a cheaper branch, on a count register. */
732 int flag_branch_on_count_reg;
734 /* -finhibit-size-directive inhibits output of .size for ELF.
735 This is used only for compiling crtstuff.c,
736 and it may be extended to other effects
737 needed for crtstuff.c on other systems. */
738 int flag_inhibit_size_directive = 0;
740 /* -fverbose-asm causes extra commentary information to be produced in
741 the generated assembly code (to make it more readable). This option
742 is generally only of use to those who actually need to read the
743 generated assembly code (perhaps while debugging the compiler itself).
744 -fno-verbose-asm, the default, causes the extra information
745 to be omitted and is useful when comparing two assembler files. */
747 int flag_verbose_asm = 0;
749 /* -dA causes debug commentary information to be produced in
750 the generated assembly code (to make it more readable). This option
751 is generally only of use to those who actually need to read the
752 generated assembly code (perhaps while debugging the compiler itself).
753 Currently, this switch is only used by dwarfout.c; however, it is intended
754 to be a catchall for printing debug information in the assembler file. */
756 int flag_debug_asm = 0;
758 /* -fgnu-linker specifies use of the GNU linker for initializations.
759 (Or, more generally, a linker that handles initializations.)
760 -fno-gnu-linker says that collect2 will be used. */
762 int flag_gnu_linker = 0;
764 int flag_gnu_linker = 1;
770 /* Tag all structures with __attribute__(packed) */
771 int flag_pack_struct = 0;
773 /* Emit code to check for stack overflow; also may cause large objects
774 to be allocated dynamically. */
775 int flag_stack_check;
777 /* When non-NULL, indicates that whenever space is allocated on the
778 stack, the resulting stack pointer must not pass this
779 address---that is, for stacks that grow downward, the stack pointer
780 must always be greater than or equal to this address; for stacks
781 that grow upward, the stack pointer must be less than this address.
782 At present, the rtx may be either a REG or a SYMBOL_REF, although
783 the support provided depends on the backend. */
786 /* -fcheck-memory-usage causes extra code to be generated in order to check
787 memory accesses. This is used by a detector of bad memory accesses such
789 int flag_check_memory_usage = 0;
791 /* -fprefix-function-name causes function name to be prefixed. This
792 can be used with -fcheck-memory-usage to isolate code compiled with
793 -fcheck-memory-usage. */
794 int flag_prefix_function_name = 0;
796 /* 0 if pointer arguments may alias each other. True in C.
797 1 if pointer arguments may not alias each other but may alias
799 2 if pointer arguments may not alias each other and may not
800 alias global variables. True in Fortran.
801 This defaults to 0 for C. */
802 int flag_argument_noalias = 0;
804 /* Nonzero if we should do (language-dependent) alias analysis.
805 Typically, this analysis will assume that expressions of certain
806 types do not alias expressions of certain other types. Only used
807 if alias analysis (in general) is enabled. */
808 int flag_strict_aliasing = 0;
810 /* Instrument functions with calls at entry and exit, for profiling. */
811 int flag_instrument_function_entry_exit = 0;
813 /* Nonzero means ignore `#ident' directives. 0 means handle them.
814 On SVR4 targets, it also controls whether or not to emit a
815 string identifying the compiler. */
817 int flag_no_ident = 0;
819 /* This will perform a peephole pass before sched2. */
820 int flag_peephole2 = 0;
822 /* -fbounded-pointers causes gcc to compile pointers as composite
823 objects occupying three words: the pointer value, the base address
824 of the referent object, and the address immediately beyond the end
825 of the referent object. The base and extent allow us to perform
826 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
827 int flag_bounded_pointers = 0;
829 /* -fcheck-bounds causes gcc to generate array bounds checks.
830 For C, C++: defaults to value of flag_bounded_pointers.
831 For ObjC: defaults to off.
832 For Java: defaults to on.
833 For Fortran: defaults to off.
834 For CHILL: defaults to off. */
835 int flag_bounds_check = 0;
837 /* If one, renumber instruction UIDs to reduce the number of
838 unused UIDs if there are a lot of instructions. If greater than
839 one, unconditionally renumber instruction UIDs. */
840 int flag_renumber_insns = 1;
842 /* Values of the -falign-* flags: how much to align labels in code.
843 0 means `use default', 1 means `don't align'.
844 For each variable, there is an _log variant which is the power
845 of two not less than the variable, for .align output. */
852 int align_labels_log;
854 int align_functions_log;
856 /* Table of supported debugging formats. */
860 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
861 constant expression, we use NO_DEBUG in its place. */
862 enum debug_info_type debug_type;
863 int use_extensions_p;
864 const char * description;
868 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
869 "Generate default debug format output" },
870 { "gdb", NO_DEBUG, 1, "Generate default extended debug format output" },
871 #ifdef DBX_DEBUGGING_INFO
872 { "stabs", DBX_DEBUG, 0, "Generate STABS format debug output" },
873 { "stabs+", DBX_DEBUG, 1, "Generate extended STABS format debug output" },
875 #ifdef DWARF_DEBUGGING_INFO
876 { "dwarf", DWARF_DEBUG, 0, "Generate DWARF-1 format debug output"},
877 { "dwarf+", DWARF_DEBUG, 1,
878 "Generated extended DWARF-1 format debug output" },
880 #ifdef DWARF2_DEBUGGING_INFO
881 { "dwarf-2", DWARF2_DEBUG, 0, "Enable DWARF-2 debug output" },
883 #ifdef XCOFF_DEBUGGING_INFO
884 { "xcoff", XCOFF_DEBUG, 0, "Generate XCOFF format debug output" },
885 { "xcoff+", XCOFF_DEBUG, 1, "Generate extended XCOFF format debug output" },
887 #ifdef SDB_DEBUGGING_INFO
888 { "coff", SDB_DEBUG, 0, "Generate COFF format debug output" },
898 const char * description;
900 lang_independent_options;
902 /* Add or remove a leading underscore from user symbols. */
903 int flag_leading_underscore = -1;
905 /* The user symbol prefix after having resolved same. */
906 const char *user_label_prefix;
908 /* A default for same. */
909 #ifndef USER_LABEL_PREFIX
910 #define USER_LABEL_PREFIX ""
913 /* Table of language-independent -f options.
914 STRING is the option name. VARIABLE is the address of the variable.
915 ON_VALUE is the value to store in VARIABLE
916 if `-fSTRING' is seen as an option.
917 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
919 lang_independent_options f_options[] =
921 {"float-store", &flag_float_store, 1,
922 "Do not store floats in registers" },
923 {"volatile", &flag_volatile, 1,
924 "Consider all mem refs through pointers as volatile"},
925 {"volatile-global", &flag_volatile_global, 1,
926 "Consider all mem refs to global data to be volatile" },
927 {"volatile-static", &flag_volatile_static, 1,
928 "Consider all mem refs to static data to be volatile" },
929 {"defer-pop", &flag_defer_pop, 1,
930 "Defer popping functions args from stack until later" },
931 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
932 "When possible do not generate stack frames"},
933 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
934 "Optimize sibling and tail recursive calls" },
935 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
936 "When running CSE, follow jumps to their targets" },
937 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
938 "When running CSE, follow conditional jumps" },
939 {"expensive-optimizations", &flag_expensive_optimizations, 1,
940 "Perform a number of minor, expensive optimisations" },
941 {"thread-jumps", &flag_thread_jumps, 1,
942 "Perform jump threading optimisations"},
943 {"strength-reduce", &flag_strength_reduce, 1,
944 "Perform strength reduction optimisations" },
945 {"unroll-loops", &flag_unroll_loops, 1,
946 "Perform loop unrolling when iteration count is known" },
947 {"unroll-all-loops", &flag_unroll_all_loops, 1,
948 "Perform loop unrolling for all loops" },
949 {"move-all-movables", &flag_move_all_movables, 1,
950 "Force all loop invariant computations out of loops" },
951 {"reduce-all-givs", &flag_reduce_all_givs, 1,
952 "Strength reduce all loop general induction variables" },
953 {"writable-strings", &flag_writable_strings, 1,
954 "Store strings in writable data section" },
955 {"peephole", &flag_no_peephole, 0,
956 "Enable machine specific peephole optimisations" },
957 {"force-mem", &flag_force_mem, 1,
958 "Copy memory operands into registers before using" },
959 {"force-addr", &flag_force_addr, 1,
960 "Copy memory address constants into regs before using" },
961 {"function-cse", &flag_no_function_cse, 0,
962 "Allow function addresses to be held in registers" },
963 {"inline-functions", &flag_inline_functions, 1,
964 "Integrate simple functions into their callers" },
965 {"keep-inline-functions", &flag_keep_inline_functions, 1,
966 "Generate code for funcs even if they are fully inlined" },
967 {"inline", &flag_no_inline, 0,
968 "Pay attention to the 'inline' keyword"},
969 {"keep-static-consts", &flag_keep_static_consts, 1,
970 "Emit static const variables even if they are not used" },
971 {"syntax-only", &flag_syntax_only, 1,
972 "Check for syntax errors, then stop" },
973 {"shared-data", &flag_shared_data, 1,
974 "Mark data as shared rather than private" },
975 {"caller-saves", &flag_caller_saves, 1,
976 "Enable saving registers around function calls" },
977 {"pcc-struct-return", &flag_pcc_struct_return, 1,
978 "Return 'short' aggregates in memory, not registers" },
979 {"reg-struct-return", &flag_pcc_struct_return, 0,
980 "Return 'short' aggregates in registers" },
981 {"delayed-branch", &flag_delayed_branch, 1,
982 "Attempt to fill delay slots of branch instructions" },
983 {"gcse", &flag_gcse, 1,
984 "Perform the global common subexpression elimination" },
985 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
986 "Run CSE pass after loop optimisations"},
987 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
988 "Run the loop optimiser twice"},
989 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
990 "Delete useless null pointer checks" },
991 {"pretend-float", &flag_pretend_float, 1,
992 "Pretend that host and target use the same FP format"},
993 {"schedule-insns", &flag_schedule_insns, 1,
994 "Reschedule instructions to avoid pipeline stalls"},
995 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
996 "Run two passes of the instruction scheduler"},
997 {"sched-interblock",&flag_schedule_interblock, 1,
998 "Enable scheduling across basic blocks" },
999 {"sched-spec",&flag_schedule_speculative, 1,
1000 "Allow speculative motion of non-loads" },
1001 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1002 "Allow speculative motion of some loads" },
1003 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1004 "Allow speculative motion of more loads" },
1005 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1006 "Replace add,compare,branch with branch on count reg"},
1007 {"pic", &flag_pic, 1,
1008 "Generate position independent code, if possible"},
1009 {"PIC", &flag_pic, 2, ""},
1010 {"exceptions", &flag_exceptions, 1,
1011 "Enable exception handling" },
1012 {"new-exceptions", &flag_new_exceptions, 1,
1013 "Use the new model for exception handling" },
1014 {"unwind-tables", &flag_unwind_tables, 1,
1015 "Just generate unwind tables for exception handling" },
1016 {"sjlj-exceptions", &exceptions_via_longjmp, 1,
1017 "Use setjmp/longjmp to handle exceptions" },
1018 {"asynchronous-exceptions", &asynchronous_exceptions, 1,
1019 "Support asynchronous exceptions" },
1020 {"profile-arcs", &profile_arc_flag, 1,
1021 "Insert arc based program profiling code" },
1022 {"test-coverage", &flag_test_coverage, 1,
1023 "Create data files needed by gcov" },
1024 {"branch-probabilities", &flag_branch_probabilities, 1,
1025 "Use profiling information for branch probabilities" },
1026 {"reorder-blocks", &flag_reorder_blocks, 1,
1027 "Reorder basic blocks to improve code placement" },
1028 {"rename-registers", &flag_rename_registers, 1,
1029 "Do the register renaming optimization pass"},
1030 {"fast-math", &flag_fast_math, 1,
1031 "Improve FP speed by violating ANSI & IEEE rules" },
1032 {"common", &flag_no_common, 0,
1033 "Do not put unitialised globals in the common section" },
1034 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1035 "Do not generate .size directives" },
1036 {"function-sections", &flag_function_sections, 1,
1037 "place each function into its own section" },
1038 {"data-sections", &flag_data_sections, 1,
1039 "place data items into their own section" },
1040 {"verbose-asm", &flag_verbose_asm, 1,
1041 "Add extra commentry to assembler output"},
1042 {"gnu-linker", &flag_gnu_linker, 1,
1043 "Output GNU ld formatted global initialisers"},
1044 {"regmove", &flag_regmove, 1,
1045 "Enables a register move optimisation"},
1046 {"optimize-register-move", &flag_regmove, 1,
1047 "Do the full regmove optimization pass"},
1048 {"pack-struct", &flag_pack_struct, 1,
1049 "Pack structure members together without holes" },
1050 {"stack-check", &flag_stack_check, 1,
1051 "Insert stack checking code into the program" },
1052 {"argument-alias", &flag_argument_noalias, 0,
1053 "Specify that arguments may alias each other & globals"},
1054 {"argument-noalias", &flag_argument_noalias, 1,
1055 "Assume arguments may alias globals but not each other"},
1056 {"argument-noalias-global", &flag_argument_noalias, 2,
1057 "Assume arguments do not alias each other or globals" },
1058 {"strict-aliasing", &flag_strict_aliasing, 1,
1059 "Assume strict aliasing rules apply" },
1060 {"align-loops", &align_loops, 0,
1061 "Align the start of loops" },
1062 {"align-jumps", &align_jumps, 0,
1063 "Align labels which are only reached by jumping" },
1064 {"align-labels", &align_labels, 0,
1065 "Align all labels" },
1066 {"align-functions", &align_functions, 0,
1067 "Align the start of functions" },
1068 {"check-memory-usage", &flag_check_memory_usage, 1,
1069 "Generate code to check every memory access" },
1070 {"prefix-function-name", &flag_prefix_function_name, 1,
1071 "Add a prefix to all function names" },
1072 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1073 "Suppress output of instruction numbers and line number notes in debugging dumps"},
1074 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1075 "Instrument function entry/exit with profiling calls"},
1076 {"ssa", &flag_ssa, 1,
1077 "Enable SSA optimizations" },
1078 {"leading-underscore", &flag_leading_underscore, 1,
1079 "External symbols have a leading underscore" },
1080 {"ident", &flag_no_ident, 0,
1081 "Process #ident directives"},
1082 { "peephole2", &flag_peephole2, 1,
1083 "Enables an rtl peephole pass run before sched2" },
1084 {"math-errno", &flag_errno_math, 1,
1085 "Set errno after built-in math functions"},
1086 {"bounded-pointers", &flag_bounded_pointers, 1,
1087 "Compile pointers as triples: value, base & end" },
1088 {"bounds-check", &flag_bounds_check, 1,
1089 "Generate code to check bounds before dereferencing pointers and arrays" }
1092 #define NUM_ELEM(a) (sizeof (a) / sizeof ((a)[0]))
1094 /* Table of language-specific options. */
1096 static struct lang_opt
1098 const char * option;
1099 const char * description;
1101 documented_lang_options[] =
1103 /* In order not to overload the --help output, the convention
1104 used here is to only describe those options which are not
1105 enabled by default. */
1107 { "-ansi", "Compile just for ANSI C" },
1108 { "-fallow-single-precision",
1109 "Do not promote floats to double if using -traditional" },
1110 { "-std= ", "Determine language standard"},
1112 { "-fsigned-bitfields", "" },
1113 { "-funsigned-bitfields","Make bitfields by unsigned by default" },
1114 { "-fno-signed-bitfields", "" },
1115 { "-fno-unsigned-bitfields","" },
1116 { "-fsigned-char", "Make 'char' be signed by default"},
1117 { "-funsigned-char", "Make 'char' be unsigned by default"},
1118 { "-fno-signed-char", "" },
1119 { "-fno-unsigned-char", "" },
1121 { "-ftraditional", "" },
1122 { "-traditional", "Attempt to support traditional K&R style C"},
1123 { "-fnotraditional", "" },
1124 { "-fno-traditional", "" },
1127 { "-fno-asm", "Do not recognise the 'asm' keyword" },
1128 { "-fbuiltin", "" },
1129 { "-fno-builtin", "Do not recognise any built in functions" },
1130 { "-fhosted", "Assume normal C execution environment" },
1131 { "-fno-hosted", "" },
1133 "Assume that standard libraries & main might not exist" },
1134 { "-fno-freestanding", "" },
1135 { "-fcond-mismatch", "Allow different types as args of ? operator"},
1136 { "-fno-cond-mismatch", "" },
1137 { "-fdollars-in-identifiers", "Allow the use of $ inside identifiers" },
1138 { "-fno-dollars-in-identifiers", "" },
1139 { "-fpreprocessed", "" },
1140 { "-fno-preprocessed", "" },
1141 { "-fshort-double", "Use the same size for double as for float" },
1142 { "-fno-short-double", "" },
1143 { "-fshort-enums", "Use the smallest fitting integer to hold enums"},
1144 { "-fno-short-enums", "" },
1145 { "-fshort-wchar", "Override the underlying type for wchar_t to `unsigned short'" },
1146 { "-fno-short-wchar", "" },
1148 { "-Wall", "Enable most warning messages" },
1149 { "-Wbad-function-cast",
1150 "Warn about casting functions to incompatible types" },
1151 { "-Wno-bad-function-cast", "" },
1152 { "-Wmissing-noreturn",
1153 "Warn about functions which might be candidates for attribute noreturn" },
1154 { "-Wno-missing-noreturn", "" },
1155 { "-Wcast-qual", "Warn about casts which discard qualifiers"},
1156 { "-Wno-cast-qual", "" },
1157 { "-Wchar-subscripts", "Warn about subscripts whose type is 'char'"},
1158 { "-Wno-char-subscripts", "" },
1159 { "-Wcomment", "Warn if nested comments are detected" },
1160 { "-Wno-comment", "" },
1161 { "-Wcomments", "Warn if nested comments are detected" },
1162 { "-Wno-comments", "" },
1163 { "-Wconversion", "Warn about possibly confusing type conversions" },
1164 { "-Wno-conversion", "" },
1165 { "-Wformat", "Warn about printf format anomalies" },
1166 { "-Wno-format", "" },
1167 { "-Wimplicit-function-declaration",
1168 "Warn about implicit function declarations" },
1169 { "-Wno-implicit-function-declaration", "" },
1170 { "-Werror-implicit-function-declaration", "" },
1171 { "-Wimplicit-int", "Warn when a declaration does not specify a type" },
1172 { "-Wno-implicit-int", "" },
1173 { "-Wimplicit", "" },
1174 { "-Wno-implicit", "" },
1175 { "-Wimport", "Warn about the use of the #import directive" },
1176 { "-Wno-import", "" },
1177 { "-Wlong-long","" },
1178 { "-Wno-long-long", "Do not warn about using 'long long' when -pedantic" },
1179 { "-Wmain", "Warn about suspicious declarations of main" },
1180 { "-Wno-main", "" },
1181 { "-Wmissing-braces",
1182 "Warn about possibly missing braces around initialisers" },
1183 { "-Wno-missing-braces", "" },
1184 { "-Wmissing-declarations",
1185 "Warn about global funcs without previous declarations"},
1186 { "-Wno-missing-declarations", "" },
1187 { "-Wmissing-prototypes", "Warn about global funcs without prototypes" },
1188 { "-Wno-missing-prototypes", "" },
1189 { "-Wmultichar", "Warn about use of multicharacter literals"},
1190 { "-Wno-multichar", "" },
1191 { "-Wnested-externs", "Warn about externs not at file scope level" },
1192 { "-Wno-nested-externs", "" },
1193 { "-Wparentheses", "Warn about possible missing parentheses" },
1194 { "-Wno-parentheses", "" },
1195 { "-Wpointer-arith", "Warn about function pointer arithmetic" },
1196 { "-Wno-pointer-arith", "" },
1197 { "-Wredundant-decls",
1198 "Warn about multiple declarations of the same object" },
1199 { "-Wno-redundant-decls", "" },
1200 { "-Wsign-compare", "Warn about signed/unsigned comparisons" },
1201 { "-Wno-sign-compare", "" },
1202 { "-Wfloat-equal", "Warn about testing equality of floating point numbers" },
1203 { "-Wno-float-equal", "" },
1204 { "-Wunknown-pragmas", "Warn about unrecognized pragmas" },
1205 { "-Wno-unknown-pragmas", "" },
1206 { "-Wstrict-prototypes", "Warn about non-prototyped function decls" },
1207 { "-Wno-strict-prototypes", "" },
1208 { "-Wtraditional", "Warn about constructs whose meaning change in ANSI C"},
1209 { "-Wno-traditional", "" },
1210 { "-Wtrigraphs", "Warn when trigraphs are encountered" },
1211 { "-Wno-trigraphs", "" },
1213 { "-Wno-undef", "" },
1214 { "-Wwrite-strings", "Mark strings as 'const char *'"},
1215 { "-Wno-write-strings", "" },
1217 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1219 /* These are for Objective C. */
1220 DEFINE_LANG_NAME ("Objective C")
1222 { "-lang-objc", "" },
1223 { "-gen-decls", "Dump decls to a .decl file" },
1224 { "-fgnu-runtime", "Generate code for GNU runtime environment" },
1225 { "-fno-gnu-runtime", "" },
1226 { "-fnext-runtime", "Generate code for NeXT runtime environment" },
1227 { "-fno-next-runtime", "" },
1228 { "-Wselector", "Warn if a selector has multiple methods" },
1229 { "-Wno-selector", "" },
1230 { "-Wprotocol", "" },
1231 { "-Wno-protocol", "Do not warn if inherited methods are unimplemented"},
1232 { "-print-objc-runtime-info",
1233 "Generate C header of platform specific features" },
1235 #include "options.h"
1239 /* Here is a table, controlled by the tm.h file, listing each -m switch
1240 and which bits in `target_switches' it should set or clear.
1241 If VALUE is positive, it is bits to set.
1242 If VALUE is negative, -VALUE is bits to clear.
1243 (The sign bit is not used so there is no confusion.) */
1249 const char * description;
1251 target_switches [] = TARGET_SWITCHES;
1253 /* This table is similar, but allows the switch to have a value. */
1255 #ifdef TARGET_OPTIONS
1258 const char * prefix;
1259 const char ** variable;
1260 const char * description;
1262 target_options [] = TARGET_OPTIONS;
1265 /* Options controlling warnings */
1267 /* Don't print warning messages. -w. */
1269 int inhibit_warnings = 0;
1271 /* Print various extra warnings. -W. */
1273 int extra_warnings = 0;
1275 /* Treat warnings as errors. -Werror. */
1277 int warnings_are_errors = 0;
1279 /* Nonzero to warn about unused local variables. */
1283 /* Nonzero to warn about code which is never reached. */
1285 int warn_notreached;
1287 /* Nonzero to warn about variables used before they are initialized. */
1289 int warn_uninitialized;
1291 /* Nonzero means warn about all declarations which shadow others. */
1295 /* Warn if a switch on an enum fails to have a case for every enum value. */
1299 /* Nonzero means warn about function definitions that default the return type
1300 or that use a null return and have a return-type other than void. */
1302 int warn_return_type;
1304 /* Nonzero means warn about pointer casts that increase the required
1305 alignment of the target type (and might therefore lead to a crash
1306 due to a misaligned access). */
1308 int warn_cast_align;
1310 /* Nonzero means warn about any identifiers that match in the first N
1311 characters. The value N is in `id_clash_len'. */
1316 /* Nonzero means warn about any objects definitions whose size is larger
1317 than N bytes. Also want about function definitions whose returned
1318 values are larger than N bytes. The value N is in `larger_than_size'. */
1320 int warn_larger_than;
1321 HOST_WIDE_INT larger_than_size;
1323 /* Nonzero means warn if inline function is too large. */
1327 /* Warn if a function returns an aggregate,
1328 since there are often incompatible calling conventions for doing this. */
1330 int warn_aggregate_return;
1332 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1336 /* Warn when gcc pads a structure to an alignment boundary. */
1340 /* Likewise for -W. */
1342 lang_independent_options W_options[] =
1344 {"unused", &warn_unused, 1, "Warn when a variable is unused" },
1345 {"error", &warnings_are_errors, 1, ""},
1346 {"shadow", &warn_shadow, 1, "Warn when one local variable shadows another" },
1347 {"switch", &warn_switch, 1,
1348 "Warn about enumerated switches missing a specific case" },
1349 {"aggregate-return", &warn_aggregate_return, 1,
1350 "Warn about returning structures, unions or arrays" },
1351 {"cast-align", &warn_cast_align, 1,
1352 "Warn about pointer casts which increase alignment" },
1353 {"unreachable-code", &warn_notreached, 1,
1354 "Warn about code that will never be executed" },
1355 {"uninitialized", &warn_uninitialized, 1,
1356 "Warn about unitialized automatic variables"},
1357 {"inline", &warn_inline, 1,
1358 "Warn when an inlined function cannot be inlined"},
1359 {"packed", &warn_packed, 1,
1360 "Warn when the packed attribute has no effect on struct layout"},
1361 {"padded", &warn_padded, 1,
1362 "Warn when padding is required to align struct members"}
1365 /* Output files for assembler code (real compiler output)
1366 and debugging dumps. */
1369 FILE *aux_info_file;
1370 FILE *rtl_dump_file = NULL;
1372 /* Decode the string P as an integral parameter.
1373 If the string is indeed an integer return its numeric value else
1374 issue an Invalid Option error for the option PNAME and return DEFVAL.
1375 If PNAME is zero just return DEFVAL, do not call error. */
1378 read_integral_parameter (p, pname, defval)
1383 const char *endp = p;
1387 if (*endp >= '0' && *endp <= '9')
1396 error ("Invalid option `%s'", pname);
1404 /* Time accumulators, to count the total time spent in various passes.
1405 The first three are used in other files; the latter two only here. */
1411 static long integration_time;
1412 static long jump_time;
1413 static long cse_time;
1414 static long gcse_time;
1415 static long loop_time;
1416 static long cse2_time;
1417 static long branch_prob_time;
1418 static long flow_time;
1419 static long combine_time;
1420 static long regmove_time;
1421 static long sched_time;
1422 static long local_alloc_time;
1423 static long global_alloc_time;
1424 static long flow2_time;
1425 static long peephole2_time;
1426 static long sched2_time;
1427 static long dbr_sched_time;
1428 static long reorder_blocks_time;
1429 static long rename_registers_time;
1430 static long shorten_branch_time;
1431 static long stack_reg_time;
1432 static long to_ssa_time;
1433 static long from_ssa_time;
1434 static long final_time;
1435 static long symout_time;
1436 static long dump_time;
1437 static long all_time;
1439 /* Return time used so far, in microseconds. */
1449 #else /* not BeOS */
1450 #if defined (_WIN32) && !defined (__CYGWIN__)
1454 return (clock() * 1000);
1455 #else /* not _WIN32 */
1461 tick = 1000000 / sysconf(_SC_CLK_TCK);
1463 return (tms.tms_utime + tms.tms_stime) * tick;
1469 # if HAVE_SYSCONF && defined _SC_CLK_TCK
1470 # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
1473 # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
1475 # define TICKS_PER_SECOND HZ /* traditional UNIX */
1479 return (tms.tms_utime + tms.tms_stime) * (1000000 / TICKS_PER_SECOND);
1484 struct rusage rusage;
1485 getrusage (0, &rusage);
1486 return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
1487 + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
1494 int proc_system_time;
1495 int child_user_time;
1496 int child_system_time;
1498 times ((void *) &vms_times);
1499 return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
1503 #endif /* _SC_CLK_TCK */
1505 #endif /* __BEOS__ */
1508 #define TIMEVAR(VAR, BODY) \
1510 long otime = get_run_time (); \
1512 VAR += get_run_time () - otime; \
1516 print_time (str, total)
1521 "time in %s: %ld.%06ld (%ld%%)\n",
1522 str, total / 1000000, total % 1000000,
1524 : (long) (((100.0 * (double) total) / (double) all_time) + .5));
1527 /* This is the default decl_printable_name function. */
1530 decl_name (decl, verbosity)
1532 int verbosity ATTRIBUTE_UNUSED;
1534 return IDENTIFIER_POINTER (DECL_NAME (decl));
1537 /* Mark P for GC. Also mark main_input_filename and input_filename. */
1543 struct file_stack *stack = *(struct file_stack **)p;
1545 /* We're only called for input_file_stack, so we can mark the current
1546 input_filename here as well. */
1547 ggc_mark_string (main_input_filename);
1548 ggc_mark_string (input_filename);
1552 ggc_mark_string (stack->name);
1553 stack = stack->next;
1558 /* This calls abort and is used to avoid problems when abort if a macro.
1559 It is used when we need to pass the address of abort. */
1567 /* When `malloc.c' is compiled with `rcheck' defined,
1568 it calls this function to report clobberage. */
1572 const char * s ATTRIBUTE_UNUSED;
1577 /* Return the logarithm of X, base 2, considering X unsigned,
1578 if X is a power of 2. Otherwise, returns -1.
1580 This should be used via the `exact_log2' macro. */
1584 register unsigned HOST_WIDE_INT x;
1586 register int log = 0;
1587 /* Test for 0 or a power of 2. */
1588 if (x == 0 || x != (x & -x))
1590 while ((x >>= 1) != 0)
1595 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1596 If X is 0, return -1.
1598 This should be used via the floor_log2 macro. */
1602 register unsigned HOST_WIDE_INT x;
1604 register int log = -1;
1611 static int float_handler_set;
1613 jmp_buf float_handler;
1615 /* Signals actually come here. */
1618 float_signal (signo)
1619 /* If this is missing, some compilers complain. */
1620 int signo ATTRIBUTE_UNUSED;
1622 if (float_handled == 0)
1624 #if defined (USG) || defined (hpux)
1625 signal (SIGFPE, float_signal); /* re-enable the signal catcher */
1628 signal (SIGFPE, float_signal);
1629 longjmp (float_handler, 1);
1632 /* Specify where to longjmp to when a floating arithmetic error happens.
1633 If HANDLER is 0, it means don't handle the errors any more. */
1636 set_float_handler (handler)
1639 float_handled = (handler != 0);
1641 bcopy ((char *) handler, (char *) float_handler, sizeof (float_handler));
1643 if (float_handled && ! float_handler_set)
1645 signal (SIGFPE, float_signal);
1646 float_handler_set = 1;
1650 /* This is a wrapper function for code which might elicit an
1651 arithmetic exception. That code should be passed in as a function
1652 pointer FN, and one argument DATA. DATA is usually a struct which
1653 contains the real input and output for function FN. This function
1654 returns 0 (failure) if longjmp was called (i.e. an exception
1655 occured.) It returns 1 (success) otherwise. */
1658 do_float_handler (fn, data)
1659 void (*fn) PARAMS ((PTR));
1666 /* We got here via longjmp() caused by an exception in function fn() */
1667 set_float_handler (NULL);
1671 set_float_handler (buf);
1673 set_float_handler (NULL);
1677 /* Specify, in HANDLER, where to longjmp to when a floating arithmetic
1678 error happens, pushing the previous specification into OLD_HANDLER.
1679 Return an indication of whether there was a previous handler in effect. */
1682 push_float_handler (handler, old_handler)
1683 jmp_buf handler, old_handler;
1685 int was_handled = float_handled;
1689 memcpy ((char *) old_handler, (char *) float_handler,
1690 sizeof (float_handler));
1692 memcpy ((char *) float_handler, (char *) handler, sizeof (float_handler));
1696 /* Restore the previous specification of whether and where to longjmp to
1697 when a floating arithmetic error happens. */
1700 pop_float_handler (handled, handler)
1704 float_handled = handled;
1706 bcopy ((char *) handler, (char *) float_handler, sizeof (float_handler));
1709 /* Handler for SIGPIPE. */
1713 /* If this is missing, some compilers complain. */
1714 int signo ATTRIBUTE_UNUSED;
1716 fatal ("output pipe has been closed");
1719 /* Strip off a legitimate source ending from the input string NAME of
1720 length LEN. Rather than having to know the names used by all of
1721 our front ends, we strip off an ending of a period followed by
1722 up to five characters. (Java uses ".class".) */
1725 strip_off_ending (name, len)
1730 for (i = 2; i < 6 && len > i; i++)
1732 if (name[len - i] == '.')
1734 name[len - i] = '\0';
1740 /* Output a quoted string. */
1743 output_quoted_string (asm_file, string)
1747 #ifdef OUTPUT_QUOTED_STRING
1748 OUTPUT_QUOTED_STRING (asm_file, string);
1752 putc ('\"', asm_file);
1753 while ((c = *string++) != 0)
1755 if (c == '\"' || c == '\\')
1756 putc ('\\', asm_file);
1759 putc ('\"', asm_file);
1763 /* Output a file name in the form wanted by System V. */
1766 output_file_directive (asm_file, input_name)
1768 const char *input_name;
1770 int len = strlen (input_name);
1771 const char *na = input_name + len;
1773 /* NA gets INPUT_NAME sans directory names. */
1774 while (na > input_name)
1778 #ifdef DIR_SEPARATOR
1779 if (na[-1] == DIR_SEPARATOR)
1785 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1786 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1788 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1789 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1791 fprintf (asm_file, "\t.file\t");
1792 output_quoted_string (asm_file, na);
1793 fputc ('\n', asm_file);
1798 #ifdef ASM_IDENTIFY_LANGUAGE
1799 /* Routine to build language identifier for object file. */
1801 output_lang_identify (asm_out_file)
1804 int len = strlen (lang_identify ()) + sizeof ("__gnu_compiled_") + 1;
1805 char *s = (char *) alloca (len);
1806 sprintf (s, "__gnu_compiled_%s", lang_identify ());
1807 ASM_OUTPUT_LABEL (asm_out_file, s);
1811 /* Routine to open a dump file. Return true if the dump file is enabled. */
1814 open_dump_file (index, decl)
1815 enum dump_file_index index;
1819 const char *open_arg;
1822 if (! dump_file[index].enabled)
1828 if (rtl_dump_file != NULL)
1829 fclose (rtl_dump_file);
1831 sprintf (seq, ".%02d.", index);
1833 if (! dump_file[index].initialized)
1835 /* If we've not initialized the files, do so now. */
1836 if (graph_dump_format != no_graph
1837 && dump_file[index].graph_dump_p)
1839 dump_name = concat (seq, dump_file[index].extension, NULL);
1840 clean_graph_dump_file (dump_base_name, dump_name);
1843 dump_file[index].initialized = 1;
1849 dump_name = concat (dump_base_name, seq,
1850 dump_file[index].extension, NULL);
1852 rtl_dump_file = fopen (dump_name, open_arg);
1853 if (rtl_dump_file == NULL)
1854 pfatal_with_name (dump_name);
1859 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1860 decl_printable_name (decl, 2));
1866 /* Routine to close a dump file. */
1869 close_dump_file (index, func, insns)
1870 enum dump_file_index index;
1871 void (*func) PARAMS ((FILE *, rtx));
1874 if (! rtl_dump_file)
1881 && graph_dump_format != no_graph
1882 && dump_file[index].graph_dump_p)
1887 sprintf (seq, ".%02d.", index);
1888 suffix = concat (seq, dump_file[index].extension, NULL);
1889 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1894 func (rtl_dump_file, insns);
1896 fflush (rtl_dump_file);
1897 fclose (rtl_dump_file);
1899 rtl_dump_file = NULL;
1903 /* Do any final processing required for the declarations in VEC, of
1904 which there are LEN. We write out inline functions and variables
1905 that have been deferred until this point, but which are required.
1906 Returns non-zero if anything was put out. */
1908 wrapup_global_declarations (vec, len)
1915 int output_something = 0;
1917 for (i = 0; i < len; i++)
1921 /* We're not deferring this any longer. */
1922 DECL_DEFER_OUTPUT (decl) = 0;
1924 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1925 && incomplete_decl_finalize_hook != 0)
1926 (*incomplete_decl_finalize_hook) (decl);
1929 /* Now emit any global variables or functions that we have been
1930 putting off. We need to loop in case one of the things emitted
1931 here references another one which comes earlier in the list. */
1935 for (i = 0; i < len; i++)
1939 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1942 /* Don't write out static consts, unless we still need them.
1944 We also keep static consts if not optimizing (for debugging),
1945 unless the user specified -fno-keep-static-consts.
1946 ??? They might be better written into the debug information.
1947 This is possible when using DWARF.
1949 A language processor that wants static constants to be always
1950 written out (even if it is not used) is responsible for
1951 calling rest_of_decl_compilation itself. E.g. the C front-end
1952 calls rest_of_decl_compilation from finish_decl.
1953 One motivation for this is that is conventional in some
1954 environments to write things like:
1955 static const char rcsid[] = "... version string ...";
1956 intending to force the string to be in the executable.
1958 A language processor that would prefer to have unneeded
1959 static constants "optimized away" would just defer writing
1960 them out until here. E.g. C++ does this, because static
1961 constants are often defined in header files.
1963 ??? A tempting alternative (for both C and C++) would be
1964 to force a constant to be written if and only if it is
1965 defined in a main file, as opposed to an include file. */
1967 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1968 && (! TREE_READONLY (decl)
1969 || TREE_PUBLIC (decl)
1970 || (!optimize && flag_keep_static_consts)
1971 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1974 rest_of_decl_compilation (decl, NULL_PTR, 1, 1);
1977 if (TREE_CODE (decl) == FUNCTION_DECL
1978 && DECL_INITIAL (decl) != 0
1979 && DECL_SAVED_INSNS (decl) != 0
1980 && (flag_keep_inline_functions
1981 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1982 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1985 temporary_allocation ();
1986 output_inline_function (decl);
1987 permanent_allocation (1);
1992 output_something = 1;
1996 return output_something;
1999 /* Issue appropriate warnings for the global declarations in VEC (of
2000 which there are LEN). Output debugging information for them. */
2002 check_global_declarations (vec, len)
2009 for (i = 0; i < len; i++)
2013 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2014 && ! TREE_ASM_WRITTEN (decl))
2015 /* Cancel the RTL for this decl so that, if debugging info
2016 output for global variables is still to come,
2017 this one will be omitted. */
2018 DECL_RTL (decl) = NULL;
2020 /* Warn about any function
2021 declared static but not defined.
2022 We don't warn about variables,
2023 because many programs have static variables
2024 that exist only to get some text into the object file. */
2025 if (TREE_CODE (decl) == FUNCTION_DECL
2027 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2028 && DECL_INITIAL (decl) == 0
2029 && DECL_EXTERNAL (decl)
2030 && ! DECL_ARTIFICIAL (decl)
2031 && ! TREE_PUBLIC (decl))
2033 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2034 pedwarn_with_decl (decl,
2035 "`%s' used but never defined");
2037 warning_with_decl (decl,
2038 "`%s' declared `static' but never defined");
2039 /* This symbol is effectively an "extern" declaration now. */
2040 TREE_PUBLIC (decl) = 1;
2041 assemble_external (decl);
2044 /* Warn about static fns or vars defined but not used,
2045 but not about inline functions or static consts
2046 since defining those in header files is normal practice. */
2048 && ((TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2049 || (TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2050 && ! DECL_IN_SYSTEM_HEADER (decl)
2051 && ! DECL_EXTERNAL (decl)
2052 && ! TREE_PUBLIC (decl)
2053 && ! TREE_USED (decl)
2054 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2055 /* The TREE_USED bit for file-scope decls
2056 is kept in the identifier, to handle multiple
2057 external decls in different scopes. */
2058 && ! TREE_USED (DECL_NAME (decl)))
2059 warning_with_decl (decl, "`%s' defined but not used");
2061 #ifdef SDB_DEBUGGING_INFO
2062 /* The COFF linker can move initialized global vars to the end.
2063 And that can screw up the symbol ordering.
2064 By putting the symbols in that order to begin with,
2065 we avoid a problem. mcsun!unido!fauern!tumuc!pes@uunet.uu.net. */
2066 if (write_symbols == SDB_DEBUG && TREE_CODE (decl) == VAR_DECL
2067 && TREE_PUBLIC (decl) && DECL_INITIAL (decl)
2068 && ! DECL_EXTERNAL (decl)
2069 && DECL_RTL (decl) != 0)
2070 TIMEVAR (symout_time, sdbout_symbol (decl, 0));
2072 /* Output COFF information for non-global
2073 file-scope initialized variables. */
2074 if (write_symbols == SDB_DEBUG
2075 && TREE_CODE (decl) == VAR_DECL
2076 && DECL_INITIAL (decl)
2077 && ! DECL_EXTERNAL (decl)
2078 && DECL_RTL (decl) != 0
2079 && GET_CODE (DECL_RTL (decl)) == MEM)
2080 TIMEVAR (symout_time, sdbout_toplevel_data (decl));
2081 #endif /* SDB_DEBUGGING_INFO */
2082 #ifdef DWARF_DEBUGGING_INFO
2083 /* Output DWARF information for file-scope tentative data object
2084 declarations, file-scope (extern) function declarations (which
2085 had no corresponding body) and file-scope tagged type declarations
2086 and definitions which have not yet been forced out. */
2088 if (write_symbols == DWARF_DEBUG
2089 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2090 TIMEVAR (symout_time, dwarfout_file_scope_decl (decl, 1));
2092 #ifdef DWARF2_DEBUGGING_INFO
2093 /* Output DWARF2 information for file-scope tentative data object
2094 declarations, file-scope (extern) function declarations (which
2095 had no corresponding body) and file-scope tagged type declarations
2096 and definitions which have not yet been forced out. */
2098 if (write_symbols == DWARF2_DEBUG
2099 && (TREE_CODE (decl) != FUNCTION_DECL || !DECL_INITIAL (decl)))
2100 TIMEVAR (symout_time, dwarf2out_decl (decl));
2105 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2106 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2107 INPUT_FILENAME and LINENO accordingly. */
2110 push_srcloc (file, line)
2114 struct file_stack *fs;
2116 if (input_file_stack)
2118 input_file_stack->name = input_filename;
2119 input_file_stack->line = lineno;
2122 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2123 fs->name = input_filename = file;
2124 fs->line = lineno = line;
2125 fs->indent_level = 0;
2126 fs->next = input_file_stack;
2127 input_file_stack = fs;
2128 input_file_stack_tick++;
2131 /* Pop the top entry off the stack of presently open source files.
2132 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2138 struct file_stack *fs;
2140 fs = input_file_stack;
2141 input_file_stack = fs->next;
2143 input_file_stack_tick++;
2144 /* The initial souce file is never popped. */
2145 if (!input_file_stack)
2147 input_filename = input_file_stack->name;
2148 lineno = input_file_stack->line;
2151 /* Compile an entire file of output from cpp, named NAME.
2152 Write a file of assembly output and various debugging dumps. */
2161 int name_specified = name != 0;
2163 if (dump_base_name == 0)
2164 dump_base_name = name ? name : "gccdump";
2168 integration_time = 0;
2174 branch_prob_time = 0;
2179 local_alloc_time = 0;
2180 global_alloc_time = 0;
2185 reorder_blocks_time = 0;
2186 rename_registers_time = 0;
2187 shorten_branch_time = 0;
2195 /* Initialize data in various passes. */
2199 name = init_parse (name);
2200 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2201 || debug_info_level == DINFO_LEVEL_VERBOSE
2202 || flag_test_coverage
2203 || warn_notreached);
2205 init_decl_processing ();
2212 init_function_once ();
2213 init_stor_layout_once ();
2214 init_varasm_once ();
2216 /* The following initialization functions need to generate rtl, so
2217 provide a dummy function context for them. */
2218 init_dummy_function_start ();
2221 if (flag_caller_saves)
2222 init_caller_save ();
2223 expand_dummy_function_end ();
2225 /* If auxiliary info generation is desired, open the output file.
2226 This goes in the same directory as the source file--unlike
2227 all the other output files. */
2228 if (flag_gen_aux_info)
2230 aux_info_file = fopen (aux_info_file_name, "w");
2231 if (aux_info_file == 0)
2232 pfatal_with_name (aux_info_file_name);
2235 /* Open assembler code output file. */
2237 if (flag_syntax_only)
2238 asm_out_file = NULL;
2241 if (! name_specified && asm_file_name == 0)
2242 asm_out_file = stdout;
2245 if (asm_file_name == 0)
2247 int len = strlen (dump_base_name);
2248 char *dumpname = (char *) xmalloc (len + 6);
2249 memcpy (dumpname, dump_base_name, len + 1);
2250 strip_off_ending (dumpname, len);
2251 strcat (dumpname, ".s");
2252 asm_file_name = dumpname;
2254 if (!strcmp (asm_file_name, "-"))
2255 asm_out_file = stdout;
2257 asm_out_file = fopen (asm_file_name, "w");
2258 if (asm_out_file == 0)
2259 pfatal_with_name (asm_file_name);
2262 #ifdef IO_BUFFER_SIZE
2263 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
2264 _IOFBF, IO_BUFFER_SIZE);
2269 name = ggc_alloc_string (name, strlen (name));
2270 input_filename = name;
2272 /* Put an entry on the input file stack for the main input file. */
2273 push_srcloc (input_filename, 0);
2275 /* Perform language-specific initialization.
2276 This may set main_input_filename. */
2279 /* If the input doesn't start with a #line, use the input name
2280 as the official input file name. */
2281 if (main_input_filename == 0)
2282 main_input_filename = name;
2284 if (flag_syntax_only)
2286 write_symbols = NO_DEBUG;
2288 profile_block_flag = 0;
2292 ASM_FILE_START (asm_out_file);
2294 #ifdef ASM_COMMENT_START
2295 if (flag_verbose_asm)
2297 /* Print the list of options in effect. */
2298 print_version (asm_out_file, ASM_COMMENT_START);
2299 print_switch_values (asm_out_file, 0, MAX_LINE,
2300 ASM_COMMENT_START, " ", "\n");
2301 /* Add a blank line here so it appears in assembler output but not
2303 fprintf (asm_out_file, "\n");
2307 /* Output something to inform GDB that this compilation was by GCC. */
2308 #ifndef ASM_IDENTIFY_GCC
2309 fprintf (asm_out_file, "gcc2_compiled.:\n");
2311 ASM_IDENTIFY_GCC (asm_out_file);
2314 /* Output something to identify which front-end produced this file. */
2315 #ifdef ASM_IDENTIFY_LANGUAGE
2316 ASM_IDENTIFY_LANGUAGE (asm_out_file);
2318 } /* ! flag_syntax_only */
2320 #ifndef ASM_OUTPUT_SECTION_NAME
2321 if (flag_function_sections)
2323 warning ("-ffunction-sections not supported for this target.");
2324 flag_function_sections = 0;
2326 if (flag_data_sections)
2328 warning ("-fdata-sections not supported for this target.");
2329 flag_data_sections = 0;
2333 if (flag_function_sections
2334 && (profile_flag || profile_block_flag))
2336 warning ("-ffunction-sections disabled; it makes profiling impossible.");
2337 flag_function_sections = 0;
2340 #ifndef OBJECT_FORMAT_ELF
2341 if (flag_function_sections && write_symbols != NO_DEBUG)
2342 warning ("-ffunction-sections may affect debugging on some targets.");
2345 /* ??? Note: There used to be a conditional here
2346 to call assemble_zeros without fail if DBX_DEBUGGING_INFO is defined.
2347 This was to guarantee separation between gcc_compiled. and
2348 the first function, for the sake of dbx on Suns.
2349 However, having the extra zero here confused the Emacs
2350 code for unexec, and might confuse other programs too.
2351 Therefore, I took out that change.
2352 In future versions we should find another way to solve
2353 that dbx problem. -- rms, 23 May 93. */
2355 /* Don't let the first function fall at the same address
2356 as gcc_compiled., if profiling. */
2357 if (profile_flag || profile_block_flag)
2359 /* It's best if we can write a nop here since some
2360 assemblers don't tolerate zeros in the text section. */
2361 output_asm_insn (get_insn_template (CODE_FOR_nop, NULL), NULL_PTR);
2364 /* If dbx symbol table desired, initialize writing it
2365 and output the predefined types. */
2366 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2367 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2368 TIMEVAR (symout_time, dbxout_init (asm_out_file, main_input_filename,
2371 #ifdef SDB_DEBUGGING_INFO
2372 if (write_symbols == SDB_DEBUG)
2373 TIMEVAR (symout_time, sdbout_init (asm_out_file, main_input_filename,
2376 #ifdef DWARF_DEBUGGING_INFO
2377 if (write_symbols == DWARF_DEBUG)
2378 TIMEVAR (symout_time, dwarfout_init (asm_out_file, main_input_filename));
2380 #ifdef DWARF2_UNWIND_INFO
2381 if (dwarf2out_do_frame ())
2382 dwarf2out_frame_init ();
2384 #ifdef DWARF2_DEBUGGING_INFO
2385 if (write_symbols == DWARF2_DEBUG)
2386 TIMEVAR (symout_time, dwarf2out_init (asm_out_file, main_input_filename));
2389 /* Initialize yet another pass. */
2391 init_final (main_input_filename);
2392 init_branch_prob (dump_base_name);
2394 start_time = get_run_time ();
2396 /* Call the parser, which parses the entire file
2397 (calling rest_of_compilation for each function). */
2399 if (yyparse () != 0)
2401 if (errorcount == 0)
2402 fnotice (stderr, "Errors detected in input file (your bison.simple is out of date)\n");
2404 /* In case there were missing closebraces,
2405 get us back to the global binding level. */
2406 while (! global_bindings_p ())
2410 /* Compilation is now finished except for writing
2411 what's left of the symbol table output. */
2413 parse_time += get_run_time () - start_time;
2415 parse_time -= integration_time;
2416 parse_time -= varconst_time;
2418 if (flag_syntax_only)
2421 globals = getdecls ();
2423 /* Really define vars that have had only a tentative definition.
2424 Really output inline functions that must actually be callable
2425 and have not been output so far. */
2428 int len = list_length (globals);
2429 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2433 /* Process the decls in reverse order--earliest first.
2434 Put them into VEC from back to front, then take out from front. */
2436 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2437 vec[len - i - 1] = decl;
2439 wrapup_global_declarations (vec, len);
2441 /* This must occur after the loop to output deferred functions. Else
2442 the profiler initializer would not be emitted if all the functions
2443 in this compilation unit were deferred.
2445 output_func_start_profiler can not cause any additional functions or
2446 data to need to be output, so it need not be in the deferred function
2448 output_func_start_profiler ();
2450 /* Now that all possible functions have been output, we can dump
2451 the exception table. */
2453 output_exception_table ();
2455 check_global_declarations (vec, len);
2461 /* Write out any pending weak symbol declarations. */
2465 /* Do dbx symbols */
2466 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2467 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2468 TIMEVAR (symout_time,
2470 dbxout_finish (asm_out_file, main_input_filename);
2474 #ifdef DWARF_DEBUGGING_INFO
2475 if (write_symbols == DWARF_DEBUG)
2476 TIMEVAR (symout_time,
2482 #ifdef DWARF2_UNWIND_INFO
2483 if (dwarf2out_do_frame ())
2484 dwarf2out_frame_finish ();
2487 #ifdef DWARF2_DEBUGGING_INFO
2488 if (write_symbols == DWARF2_DEBUG)
2489 TIMEVAR (symout_time,
2491 dwarf2out_finish ();
2495 /* Output some stuff at end of file if nec. */
2497 end_final (dump_base_name);
2499 if (flag_test_coverage || flag_branch_probabilities)
2501 open_dump_file (DFI_bp, NULL);
2503 TIMEVAR (dump_time, end_branch_prob (rtl_dump_file));
2505 close_dump_file (DFI_bp, NULL, NULL_RTX);
2509 ASM_FILE_END (asm_out_file);
2512 /* Language-specific end of compilation actions. */
2516 /* Close the dump files. */
2518 if (flag_gen_aux_info)
2520 fclose (aux_info_file);
2522 unlink (aux_info_file_name);
2525 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2527 TIMEVAR (dump_time, dump_combine_total_stats (rtl_dump_file));
2528 close_dump_file (DFI_combine, NULL, NULL_RTX);
2531 /* Close non-debugging input and output files. Take special care to note
2532 whether fclose returns an error, since the pages might still be on the
2533 buffer chain while the file is open. */
2537 if (! flag_syntax_only
2538 && (ferror (asm_out_file) != 0 || fclose (asm_out_file) != 0))
2539 fatal_io_error (asm_file_name);
2541 /* Do whatever is necessary to finish printing the graphs. */
2542 if (graph_dump_format != no_graph)
2546 for (i = 0; i < DFI_MAX; ++i)
2547 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
2552 sprintf (seq, ".%02d.", i);
2553 suffix = concat (seq, dump_file[i].extension, NULL);
2554 finish_graph_dump_file (dump_base_name, suffix);
2559 /* Free up memory for the benefit of leak detectors. */
2562 /* Print the times. */
2566 all_time = get_run_time ();
2568 fprintf (stderr,"\n");
2570 print_time ("parse", parse_time);
2571 print_time ("integration", integration_time);
2572 print_time ("jump", jump_time);
2573 print_time ("cse", cse_time);
2574 print_time ("to ssa", to_ssa_time);
2575 print_time ("from ssa", from_ssa_time);
2576 print_time ("gcse", gcse_time);
2577 print_time ("loop", loop_time);
2578 print_time ("cse2", cse2_time);
2579 print_time ("branch-prob", branch_prob_time);
2580 print_time ("flow", flow_time);
2581 print_time ("combine", combine_time);
2582 print_time ("regmove", regmove_time);
2583 #ifdef INSN_SCHEDULING
2584 print_time ("sched", sched_time);
2586 print_time ("local-alloc", local_alloc_time);
2587 print_time ("global-alloc", global_alloc_time);
2588 print_time ("flow2", flow2_time);
2589 #ifdef HAVE_peephole2
2590 print_time ("peephole2", peephole2_time);
2592 #ifdef INSN_SCHEDULING
2593 print_time ("sched2", sched2_time);
2596 print_time ("dbranch", dbr_sched_time);
2598 print_time ("bbro", reorder_blocks_time);
2599 print_time ("rnreg", rename_registers_time);
2600 print_time ("shorten-branch", shorten_branch_time);
2602 print_time ("stack-reg", stack_reg_time);
2604 print_time ("final", final_time);
2605 print_time ("varconst", varconst_time);
2606 print_time ("symout", symout_time);
2607 print_time ("dump", dump_time);
2609 print_time ("gc", gc_time);
2613 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2614 and TYPE_DECL nodes.
2616 This does nothing for local (non-static) variables, unless the
2617 variable is a register variable with an ASMSPEC. In that case, or
2618 if the variable is not an automatice, it sets up the RTL and
2619 outputs any assembler code (label definition, storage allocation
2620 and initialization).
2622 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2623 the assembler symbol name to be used. TOP_LEVEL is nonzero
2624 if this declaration is not within a function. */
2627 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2629 const char *asmspec;
2633 /* Declarations of variables, and of functions defined elsewhere. */
2635 /* The most obvious approach, to put an #ifndef around where
2636 this macro is used, doesn't work since it's inside a macro call. */
2637 #ifndef ASM_FINISH_DECLARE_OBJECT
2638 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2641 /* Forward declarations for nested functions are not "external",
2642 but we need to treat them as if they were. */
2643 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2644 || TREE_CODE (decl) == FUNCTION_DECL)
2645 TIMEVAR (varconst_time,
2647 make_decl_rtl (decl, asmspec, top_level);
2648 /* Initialized extern variable exists to be replaced
2649 with its value, or represents something that will be
2650 output in another file. */
2651 if (! (TREE_CODE (decl) == VAR_DECL
2652 && DECL_EXTERNAL (decl) && TREE_READONLY (decl)
2653 && DECL_INITIAL (decl) != 0
2654 && DECL_INITIAL (decl) != error_mark_node))
2655 /* Don't output anything
2656 when a tentative file-scope definition is seen.
2657 But at end of compilation, do output code for them. */
2658 if (! (! at_end && top_level
2659 && (DECL_INITIAL (decl) == 0
2660 || DECL_INITIAL (decl) == error_mark_node)))
2661 assemble_variable (decl, top_level, at_end, 0);
2662 if (decl == last_assemble_variable_decl)
2664 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2668 else if (DECL_REGISTER (decl) && asmspec != 0)
2670 if (decode_reg_name (asmspec) >= 0)
2672 DECL_RTL (decl) = 0;
2673 make_decl_rtl (decl, asmspec, top_level);
2676 error ("invalid register name `%s' for register variable", asmspec);
2678 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2679 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2680 && TREE_CODE (decl) == TYPE_DECL)
2681 TIMEVAR (symout_time, dbxout_symbol (decl, 0));
2683 #ifdef SDB_DEBUGGING_INFO
2684 else if (write_symbols == SDB_DEBUG && top_level
2685 && TREE_CODE (decl) == TYPE_DECL)
2686 TIMEVAR (symout_time, sdbout_symbol (decl, 0));
2690 /* Called after finishing a record, union or enumeral type. */
2693 rest_of_type_compilation (type, toplev)
2694 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2698 tree type ATTRIBUTE_UNUSED;
2699 int toplev ATTRIBUTE_UNUSED;
2702 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2703 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2704 TIMEVAR (symout_time, dbxout_symbol (TYPE_STUB_DECL (type), !toplev));
2706 #ifdef SDB_DEBUGGING_INFO
2707 if (write_symbols == SDB_DEBUG)
2708 TIMEVAR (symout_time, sdbout_symbol (TYPE_STUB_DECL (type), !toplev));
2712 /* DECL is an inline function, whose body is present, but which is not
2713 being output at this point. (We're putting that off until we need
2714 to do it.) If there are any actions that need to take place,
2715 including the emission of debugging information for the function,
2716 this is where they should go. This function may be called by
2717 language-dependent code for front-ends that do not even generate
2718 RTL for functions that don't need to be put out. */
2721 note_deferral_of_defined_inline_function (decl)
2722 tree decl ATTRIBUTE_UNUSED;
2724 #ifdef DWARF_DEBUGGING_INFO
2725 /* Generate the DWARF info for the "abstract" instance of a function
2726 which we may later generate inlined and/or out-of-line instances
2728 if (write_symbols == DWARF_DEBUG)
2730 /* The front-end may not have set CURRENT_FUNCTION_DECL, but the
2731 DWARF code expects it to be set in this case. Intuitively,
2732 DECL is the function we just finished defining, so setting
2733 CURRENT_FUNCTION_DECL is sensible. */
2734 tree saved_cfd = current_function_decl;
2735 current_function_decl = decl;
2737 /* Let the DWARF code do its work. */
2738 set_decl_abstract_flags (decl, 1);
2739 dwarfout_file_scope_decl (decl, 0);
2740 set_decl_abstract_flags (decl, 0);
2742 /* Reset CURRENT_FUNCTION_DECL. */
2743 current_function_decl = saved_cfd;
2748 /* This is called from finish_function (within yyparse)
2749 after each top-level definition is parsed.
2750 It is supposed to compile that function or variable
2751 and output the assembler code for it.
2752 After we return, the tree storage is freed. */
2755 rest_of_compilation (decl)
2759 int start_time = get_run_time ();
2762 int rebuild_label_notes_after_reload;
2764 /* When processing delayed functions, prepare_function_start() won't
2765 have been run to re-initialize it. */
2766 cse_not_expected = ! optimize;
2768 /* First, make sure that NOTE_BLOCK is set correctly for each
2769 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2770 if (!cfun->x_whole_function_mode_p)
2773 /* Then remove any notes we don't need. That will make iterating
2774 over the instruction sequence faster, and allow the garbage
2775 collector to reclaim the memory used by the notes. */
2776 remove_unncessary_notes ();
2778 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2779 tree in sensible shape. So, we just recalculate it here. */
2780 if (cfun->x_whole_function_mode_p)
2783 /* If we are reconsidering an inline function
2784 at the end of compilation, skip the stuff for making it inline. */
2786 if (DECL_SAVED_INSNS (decl) == 0)
2792 /* If this is nested inside an inlined external function, pretend
2793 it was only declared. Since we cannot inline such functions,
2794 generating code for this one is not only not necessary but will
2795 confuse some debugging output writers. */
2796 for (parent = DECL_CONTEXT (current_function_decl);
2797 parent != NULL_TREE;
2798 parent = get_containing_scope (parent))
2799 if (TREE_CODE (parent) == FUNCTION_DECL
2800 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2802 DECL_INITIAL (decl) = 0;
2803 goto exit_rest_of_compilation;
2806 /* If requested, consider whether to make this function inline. */
2807 if (DECL_INLINE (decl) || flag_inline_functions)
2808 TIMEVAR (integration_time,
2810 lose = function_cannot_inline_p (decl);
2811 if (lose || ! optimize)
2813 if (warn_inline && DECL_INLINE (decl))
2814 warning_with_decl (decl, lose);
2815 DECL_ABSTRACT_ORIGIN (decl) = 0;
2816 /* Don't really compile an extern inline function.
2817 If we can't make it inline, pretend
2818 it was only declared. */
2819 if (DECL_EXTERNAL (decl))
2821 DECL_INITIAL (decl) = 0;
2822 goto exit_rest_of_compilation;
2826 /* ??? Note that this has the effect of making it look
2827 like "inline" was specified for a function if we choose
2828 to inline it. This isn't quite right, but it's
2829 probably not worth the trouble to fix. */
2830 inlinable = DECL_INLINE (decl) = 1;
2833 insns = get_insns ();
2835 /* Dump the rtl code if we are dumping rtl. */
2837 if (open_dump_file (DFI_rtl, decl))
2839 if (DECL_SAVED_INSNS (decl))
2840 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2841 close_dump_file (DFI_rtl, print_rtl, insns);
2844 /* If function is inline, and we don't yet know whether to
2845 compile it by itself, defer decision till end of compilation.
2846 finish_compilation will call rest_of_compilation again
2847 for those functions that need to be output. Also defer those
2848 functions that we are supposed to defer. */
2851 || (DECL_INLINE (decl)
2852 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2853 && ! flag_keep_inline_functions)
2854 || DECL_EXTERNAL (decl))))
2855 DECL_DEFER_OUTPUT (decl) = 1;
2857 if (DECL_DEFER_OUTPUT (decl))
2859 /* If -Wreturn-type, we have to do a bit of compilation.
2860 However, if we just fall through we will call
2861 save_for_inline_copying() which results in excessive
2862 memory use. Instead, we just want to call
2863 jump_optimize() to figure out whether or not we can fall
2864 off the end of the function; we do the minimum amount of
2865 work necessary to make that safe. And, we set optimize
2866 to zero to keep jump_optimize from working too hard. */
2867 if (warn_return_type)
2869 int saved_optimize = optimize;
2871 find_exception_handler_labels ();
2872 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
2873 !JUMP_AFTER_REGSCAN);
2874 optimize = saved_optimize;
2877 current_function_nothrow = nothrow_function_p ();
2878 if (current_function_nothrow)
2879 /* Now we know that this can't throw; set the flag for the benefit
2880 of other functions later in this translation unit. */
2881 TREE_NOTHROW (current_function_decl) = 1;
2883 note_deferral_of_defined_inline_function (decl);
2884 TIMEVAR (integration_time, save_for_inline_nocopy (decl));
2885 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2886 goto exit_rest_of_compilation;
2889 /* If specified extern inline but we aren't inlining it, we are
2890 done. This goes for anything that gets here with DECL_EXTERNAL
2891 set, not just things with DECL_INLINE. */
2892 if (DECL_EXTERNAL (decl))
2893 goto exit_rest_of_compilation;
2896 init_EXPR_INSN_LIST_cache ();
2898 /* We may have potential sibling or tail recursion sites. Select one
2899 (of possibly multiple) methods of performing the call. */
2900 if (flag_optimize_sibling_calls)
2901 optimize_sibling_and_tail_recursive_calls ();
2906 /* Initialize some variables used by the optimizers. */
2907 init_function_for_compilation ();
2909 if (! DECL_DEFER_OUTPUT (decl))
2910 TREE_ASM_WRITTEN (decl) = 1;
2912 /* Now that integrate will no longer see our rtl, we need not distinguish
2913 between the return value of this function and the return value of called
2915 rtx_equal_function_value_matters = 0;
2917 /* Don't return yet if -Wreturn-type; we need to do jump_optimize. */
2918 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2919 goto exit_rest_of_compilation;
2921 /* Emit code to get eh context, if needed. */
2925 /* If we are doing position-independent code generation, now
2926 is the time to output special prologues and epilogues.
2927 We do not want to do this earlier, because it just clutters
2928 up inline functions with meaningless insns. */
2933 /* From now on, allocate rtl in current_obstack, not in saveable_obstack.
2934 Note that that may have been done above, in save_for_inline_copying.
2935 The call to resume_temporary_allocation near the end of this function
2936 goes back to the usual state of affairs. This must be done after
2937 we've built up any unwinders for exception handling, and done
2938 the FINALIZE_PIC work, if necessary. */
2940 rtl_in_current_obstack ();
2942 insns = get_insns ();
2944 /* Copy any shared structure that should not be shared. */
2945 unshare_all_rtl (current_function_decl, insns);
2947 #ifdef SETJMP_VIA_SAVE_AREA
2948 /* This must be performed before virutal register instantiation. */
2949 if (current_function_calls_alloca)
2950 optimize_save_area_alloca (insns);
2953 /* Instantiate all virtual registers. */
2954 instantiate_virtual_regs (current_function_decl, insns);
2956 /* Find all the EH handlers. */
2957 find_exception_handler_labels ();
2959 open_dump_file (DFI_jump, decl);
2961 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2962 are initialized and to compute whether control can drop off the end
2966 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2967 before jump optimization switches branch directions. */
2968 expected_value_to_br_prob ();
2970 reg_scan (insns, max_reg_num (), 0);
2971 jump_optimize (insns, !JUMP_CROSS_JUMP, !JUMP_NOOP_MOVES,
2972 JUMP_AFTER_REGSCAN);
2975 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2976 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2978 close_dump_file (DFI_jump, print_rtl, insns);
2979 goto exit_rest_of_compilation;
2984 /* Try to identify useless null pointer tests and delete them. */
2985 if (flag_delete_null_pointer_checks)
2987 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2988 cleanup_cfg (insns);
2989 delete_null_pointer_checks (insns);
2992 /* Jump optimization, and the removal of NULL pointer checks,
2993 may have reduced the number of instructions substantially.
2994 CSE, and future passes, allocate arrays whose dimensions
2995 involve the maximum instruction UID, so if we can reduce
2996 the maximum UID we'll save big on memory. */
2997 renumber_insns (rtl_dump_file);
3000 close_dump_file (DFI_jump, print_rtl, insns);
3005 /* Perform common subexpression elimination.
3006 Nonzero value from `cse_main' means that jumps were simplified
3007 and some code may now be unreachable, so do
3008 jump optimization again. */
3012 open_dump_file (DFI_cse, decl);
3014 TIMEVAR (cse_time, reg_scan (insns, max_reg_num (), 1));
3016 if (flag_thread_jumps)
3017 TIMEVAR (jump_time, thread_jumps (insns, max_reg_num (), 1));
3019 TIMEVAR (cse_time, tem = cse_main (insns, max_reg_num (),
3022 /* If we are not running the second CSE pass, then we are no longer
3023 expecting CSE to be run. */
3024 cse_not_expected = !flag_rerun_cse_after_loop;
3026 if (tem || optimize > 1)
3027 TIMEVAR (jump_time, jump_optimize (insns, !JUMP_CROSS_JUMP,
3029 !JUMP_AFTER_REGSCAN));
3031 /* Run this after jump optmizations remove all the unreachable code
3032 so that unreachable code will not keep values live. */
3033 TIMEVAR (cse_time, delete_trivially_dead_insns (insns, max_reg_num ()));
3035 /* Try to identify useless null pointer tests and delete them. */
3036 if (flag_delete_null_pointer_checks)
3039 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3040 cleanup_cfg (insns);
3041 delete_null_pointer_checks (insns);
3044 /* The second pass of jump optimization is likely to have
3045 removed a bunch more instructions. */
3046 renumber_insns (rtl_dump_file);
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);
3061 if (optimize > 0 && flag_ssa)
3063 open_dump_file (DFI_ssa, decl);
3065 TIMEVAR (to_ssa_time,
3067 find_basic_blocks (insns, max_reg_num(), rtl_dump_file);
3068 cleanup_cfg (insns);
3072 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
3074 open_dump_file (DFI_ussa, decl);
3076 TIMEVAR (from_ssa_time,
3078 convert_from_ssa ();
3080 /* New registers have been created. Rescan their usage. */
3081 reg_scan (insns, max_reg_num (), 1);
3083 /* Life analysis used in SSA adds log_links but these
3084 shouldn't be there until the flow stage, so clear
3086 clear_log_links (insns);
3089 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
3095 /* Perform global cse. */
3097 if (optimize > 0 && flag_gcse)
3099 open_dump_file (DFI_gcse, decl);
3103 find_basic_blocks (insns, max_reg_num(), rtl_dump_file);
3104 cleanup_cfg (insns);
3105 tem = gcse_main (insns, rtl_dump_file);
3108 /* If gcse altered any jumps, rerun jump optimizations to clean
3112 TIMEVAR (jump_time, jump_optimize (insns, !JUMP_CROSS_JUMP,
3114 !JUMP_AFTER_REGSCAN));
3117 close_dump_file (DFI_gcse, print_rtl, insns);
3123 /* Move constant computations out of loops. */
3127 open_dump_file (DFI_loop, decl);
3132 if (flag_rerun_loop_opt)
3134 /* We only want to perform unrolling once. */
3136 loop_optimize (insns, rtl_dump_file, 0, 0);
3138 /* The first call to loop_optimize makes some instructions
3139 trivially dead. We delete those instructions now in the
3140 hope that doing so will make the heuristics in loop work
3141 better and possibly speed up compilation. */
3142 delete_trivially_dead_insns (insns, max_reg_num ());
3144 /* The regscan pass is currently necessary as the alias
3145 analysis code depends on this information. */
3146 reg_scan (insns, max_reg_num (), 1);
3148 loop_optimize (insns, rtl_dump_file, flag_unroll_loops, 1);
3151 close_dump_file (DFI_loop, print_rtl, insns);
3157 /* ??? Well, nearly. If HAVE_conditional_arithmetic, jump_optimize
3158 has put off all if-conversion until "after CSE". If we put this
3159 off any longer we may miss out doing if-conversion entirely. */
3160 cse_not_expected = 1;
3164 open_dump_file (DFI_cse2, decl);
3166 if (flag_rerun_cse_after_loop)
3168 /* Running another jump optimization pass before the second
3169 cse pass sometimes simplifies the RTL enough to allow
3170 the second CSE pass to do a better job. Jump_optimize can change
3171 max_reg_num so we must rerun reg_scan afterwards.
3172 ??? Rework to not call reg_scan so often. */
3175 reg_scan (insns, max_reg_num (), 0);
3176 jump_optimize (insns, !JUMP_CROSS_JUMP,
3177 !JUMP_NOOP_MOVES, JUMP_AFTER_REGSCAN);
3182 reg_scan (insns, max_reg_num (), 0);
3183 tem = cse_main (insns, max_reg_num (),
3188 TIMEVAR (jump_time, jump_optimize (insns, !JUMP_CROSS_JUMP,
3190 !JUMP_AFTER_REGSCAN));
3193 if (flag_thread_jumps)
3195 /* This pass of jump threading straightens out code
3196 that was kinked by loop optimization. */
3199 reg_scan (insns, max_reg_num (), 0);
3200 thread_jumps (insns, max_reg_num (), 0);
3204 close_dump_file (DFI_cse2, print_rtl, insns);
3210 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
3212 open_dump_file (DFI_bp, decl);
3214 TIMEVAR (branch_prob_time,
3216 branch_prob (insns, rtl_dump_file);
3219 close_dump_file (DFI_bp, print_rtl, insns);
3227 /* Print function header into flow dump now
3228 because doing the flow analysis makes some of the dump. */
3230 open_dump_file (DFI_flow, decl);
3232 /* Do control and data flow analysis; wrote some of the results to
3238 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3239 cleanup_cfg (insns);
3241 calculate_loop_depth (rtl_dump_file);
3242 life_analysis (insns, max_reg_num (), rtl_dump_file, 1);
3243 mark_constant_function ();
3246 if (warn_uninitialized || extra_warnings)
3248 uninitialized_vars_warning (DECL_INITIAL (decl));
3250 setjmp_args_warning ();
3253 close_dump_file (DFI_flow, print_rtl_with_bb, insns);
3258 /* The first life analysis pass has finished. From now on we can not
3259 generate any new pseudos. */
3262 /* If -opt, try combining insns through substitution. */
3266 int rebuild_jump_labels_after_combine = 0;
3268 open_dump_file (DFI_combine, decl);
3270 TIMEVAR (combine_time,
3272 rebuild_jump_labels_after_combine
3273 = combine_instructions (insns, max_reg_num ());
3276 /* Combining insns may have turned an indirect jump into a
3277 direct jump. Rebuid the JUMP_LABEL fields of jumping
3279 if (rebuild_jump_labels_after_combine)
3281 TIMEVAR (jump_time, rebuild_jump_labels (insns));
3284 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3290 /* Register allocation pre-pass, to reduce number of moves
3291 necessary for two-address machines. */
3292 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3294 open_dump_file (DFI_regmove, decl);
3296 TIMEVAR (regmove_time, regmove_optimize (insns, max_reg_num (),
3299 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3305 if (optimize && n_basic_blocks)
3307 TIMEVAR (gcse_time, optimize_mode_switching (NULL_PTR));
3310 #ifdef INSN_SCHEDULING
3312 /* Print function header into sched dump now
3313 because doing the sched analysis makes some of the dump. */
3314 if (optimize > 0 && flag_schedule_insns)
3316 open_dump_file (DFI_sched, decl);
3318 /* Do control and data sched analysis,
3319 and write some of the results to dump file. */
3321 TIMEVAR (sched_time, schedule_insns (rtl_dump_file));
3323 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3330 /* Determine if the current function is a leaf before running reload
3331 since this can impact optimizations done by the prologue and
3332 epilogue thus changing register elimination offsets. */
3333 current_function_is_leaf = leaf_function_p ();
3335 open_dump_file (DFI_lreg, decl);
3337 /* Allocate pseudo-regs that are used only within 1 basic block.
3339 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3340 jump optimizer after register allocation and reloading are finished. */
3342 TIMEVAR (local_alloc_time,
3344 /* We recomputed reg usage as part of updating the rest
3345 of life info during sched. */
3346 if (! flag_schedule_insns)
3347 recompute_reg_usage (insns, ! optimize_size);
3348 regclass (insns, max_reg_num (), rtl_dump_file);
3349 rebuild_label_notes_after_reload = local_alloc ();
3352 if (dump_file[DFI_lreg].enabled)
3356 dump_flow_info (rtl_dump_file);
3357 dump_local_alloc (rtl_dump_file);
3360 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3366 open_dump_file (DFI_greg, decl);
3368 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3369 pass fixing up any insns that are invalid. */
3371 TIMEVAR (global_alloc_time,
3374 failure = global_alloc (rtl_dump_file);
3377 build_insn_chain (insns);
3378 failure = reload (insns, 0, rtl_dump_file);
3383 goto exit_rest_of_compilation;
3388 /* Do a very simple CSE pass over just the hard registers. */
3390 reload_cse_regs (insns);
3392 /* If optimizing, then go ahead and split insns now since we are about
3393 to recompute flow information anyway. */
3395 split_all_insns (0);
3397 /* Register allocation and reloading may have turned an indirect jump into
3398 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3399 jumping instructions. */
3400 if (rebuild_label_notes_after_reload)
3401 TIMEVAR (jump_time, rebuild_jump_labels (insns));
3403 if (dump_file[DFI_greg].enabled)
3405 TIMEVAR (dump_time, dump_global_regs (rtl_dump_file));
3406 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3409 /* Re-create the death notes which were deleted during reload. */
3410 open_dump_file (DFI_flow2, decl);
3412 TIMEVAR (flow2_time,
3414 jump_optimize_minimal (insns);
3415 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3418 /* On some machines, the prologue and epilogue code, or parts thereof,
3419 can be represented as RTL. Doing so lets us schedule insns between
3420 it and the rest of the code and also allows delayed branch
3421 scheduling to operate in the epilogue. */
3422 thread_prologue_and_epilogue_insns (insns);
3426 TIMEVAR (flow2_time,
3428 cleanup_cfg (insns);
3429 life_analysis (insns, max_reg_num (), rtl_dump_file, 1);
3432 /* This is kind of heruistics. We need to run combine_stack_adjustments
3433 even for machines with possibly nonzero RETURN_POPS_ARGS
3434 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3435 push instructions will have popping returns. */
3436 #ifndef PUSH_ROUNDING
3437 if (!ACCUMULATE_OUTGOING_ARGS)
3439 TIMEVAR (flow2_time, { combine_stack_adjustments (); });
3445 flow2_completed = 1;
3447 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3449 #ifdef HAVE_peephole2
3450 if (optimize > 0 && flag_peephole2)
3452 open_dump_file (DFI_peephole2, decl);
3454 TIMEVAR (peephole2_time, peephole2_optimize (rtl_dump_file));
3456 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3460 #ifdef INSN_SCHEDULING
3461 if (optimize > 0 && flag_schedule_insns_after_reload)
3463 open_dump_file (DFI_sched2, decl);
3465 /* Do control and data sched analysis again,
3466 and write some more of the results to dump file. */
3468 TIMEVAR (sched2_time, schedule_insns (rtl_dump_file));
3470 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3477 #ifdef LEAF_REGISTERS
3478 current_function_uses_only_leaf_regs
3479 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3482 if (optimize > 0 && flag_reorder_blocks)
3484 open_dump_file (DFI_bbro, decl);
3486 TIMEVAR (reorder_blocks_time, reorder_basic_blocks ());
3488 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3491 if (optimize > 0 && flag_rename_registers)
3493 open_dump_file (DFI_rnreg, decl);
3495 TIMEVAR (rename_registers_time, regrename_optimize ());
3497 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3500 /* One more attempt to remove jumps to .+1 left by dead-store elimination.
3501 Also do cross-jumping this time and delete no-op move insns. */
3505 open_dump_file (DFI_jump2, decl);
3507 TIMEVAR (jump_time, jump_optimize (insns, JUMP_CROSS_JUMP,
3509 !JUMP_AFTER_REGSCAN));
3511 close_dump_file (DFI_jump2, print_rtl_with_bb, insns);
3514 /* If a machine dependent reorganization is needed, call it. */
3515 #ifdef MACHINE_DEPENDENT_REORG
3516 open_dump_file (DFI_mach, decl);
3518 MACHINE_DEPENDENT_REORG (insns);
3520 close_dump_file (DFI_mach, print_rtl_with_bb, insns);
3526 /* If a scheduling pass for delayed branches is to be done,
3527 call the scheduling code. */
3530 if (optimize > 0 && flag_delayed_branch)
3532 open_dump_file (DFI_dbr, decl);
3537 dbr_schedule (insns, rtl_dump_file);
3540 close_dump_file (DFI_dbr, print_rtl_with_bb, insns);
3547 /* Shorten branches.
3549 Note this must run before reg-stack because of death note (ab)use
3550 in the ia32 backend. */
3551 TIMEVAR (shorten_branch_time, shorten_branches (get_insns ()));
3554 open_dump_file (DFI_stack, decl);
3556 TIMEVAR (stack_reg_time, reg_to_stack (insns, rtl_dump_file));
3558 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3564 current_function_nothrow = nothrow_function_p ();
3565 if (current_function_nothrow)
3566 /* Now we know that this can't throw; set the flag for the benefit
3567 of other functions later in this translation unit. */
3568 TREE_NOTHROW (current_function_decl) = 1;
3570 /* Now turn the rtl into assembler code. */
3572 TIMEVAR (final_time,
3577 /* Get the function's name, as described by its RTL.
3578 This may be different from the DECL_NAME name used
3579 in the source file. */
3581 x = DECL_RTL (decl);
3582 if (GET_CODE (x) != MEM)
3585 if (GET_CODE (x) != SYMBOL_REF)
3587 fnname = XSTR (x, 0);
3589 assemble_start_function (decl, fnname);
3590 final_start_function (insns, asm_out_file, optimize);
3591 final (insns, asm_out_file, optimize, 0);
3592 final_end_function (insns, asm_out_file, optimize);
3593 assemble_end_function (decl, fnname);
3595 fflush (asm_out_file);
3597 /* Release all memory allocated by flow. */
3598 free_basic_block_vars (0);
3600 /* Release all memory held by regsets now */
3601 regset_release_memory ();
3607 /* Write DBX symbols if requested */
3609 /* Note that for those inline functions where we don't initially
3610 know for certain that we will be generating an out-of-line copy,
3611 the first invocation of this routine (rest_of_compilation) will
3612 skip over this code by doing a `goto exit_rest_of_compilation;'.
3613 Later on, finish_compilation will call rest_of_compilation again
3614 for those inline functions that need to have out-of-line copies
3615 generated. During that call, we *will* be routed past here. */
3617 #ifdef DBX_DEBUGGING_INFO
3618 if (write_symbols == DBX_DEBUG)
3619 TIMEVAR (symout_time, dbxout_function (decl));
3622 #ifdef DWARF_DEBUGGING_INFO
3623 if (write_symbols == DWARF_DEBUG)
3624 TIMEVAR (symout_time, dwarfout_file_scope_decl (decl, 0));
3627 #ifdef DWARF2_DEBUGGING_INFO
3628 if (write_symbols == DWARF2_DEBUG)
3629 TIMEVAR (symout_time, dwarf2out_decl (decl));
3632 exit_rest_of_compilation:
3634 /* In case the function was not output,
3635 don't leave any temporary anonymous types
3636 queued up for sdb output. */
3637 #ifdef SDB_DEBUGGING_INFO
3638 if (write_symbols == SDB_DEBUG)
3639 sdbout_types (NULL_TREE);
3642 reload_completed = 0;
3643 flow2_completed = 0;
3646 TIMEVAR (final_time,
3648 /* Clear out the insn_length contents now that they are no
3650 init_insn_lengths ();
3652 /* Clear out the real_constant_chain before some of the rtx's
3653 it runs through become garbage. */
3654 clear_const_double_mem ();
3656 /* Cancel the effect of rtl_in_current_obstack. */
3657 resume_temporary_allocation ();
3659 /* Show no temporary slots allocated. */
3662 free_basic_block_vars (0);
3665 /* Make sure volatile mem refs aren't considered valid operands for
3666 arithmetic insns. We must call this here if this is a nested inline
3667 function, since the above code leaves us in the init_recog state
3668 (from final.c), and the function context push/pop code does not
3669 save/restore volatile_ok.
3671 ??? Maybe it isn't necessary for expand_start_function to call this
3672 anymore if we do it here? */
3674 init_recog_no_volatile ();
3676 /* We're done with this function. Free up memory if we can. */
3677 free_after_parsing (cfun);
3678 if (! DECL_DEFER_OUTPUT (decl))
3679 free_after_compilation (cfun);
3685 /* The parsing time is all the time spent in yyparse
3686 *except* what is spent in this function. */
3688 parse_time -= get_run_time () - start_time;
3699 printf ("Usage: %s input [switches]\n", progname);
3700 printf ("Switches:\n");
3702 printf (" -ffixed-<register> Mark <register> as being unavailable to the compiler\n");
3703 printf (" -fcall-used-<register> Mark <register> as being corrupted by function calls\n");
3704 printf (" -fcall-saved-<register> Mark <register> as being preserved across functions\n");
3705 printf (" -finline-limit=<number> Limits the size of inlined functions to <number>\n");
3707 for (i = NUM_ELEM (f_options); i--;)
3709 const char * description = f_options[i].description;
3711 if (description != NULL && * description != 0)
3712 printf (" -f%-21s %s\n",
3713 f_options[i].string, description);
3716 printf (" -O[number] Set optimisation level to [number]\n");
3717 printf (" -Os Optimise for space rather than speed\n");
3718 printf (" -pedantic Issue warnings needed by strict compliance to ANSI C\n");
3719 printf (" -pedantic-errors Like -pedantic except that errors are produced\n");
3720 printf (" -w Suppress warnings\n");
3721 printf (" -W Enable extra warnings\n");
3723 for (i = NUM_ELEM (W_options); i--;)
3725 const char * description = W_options[i].description;
3727 if (description != NULL && * description != 0)
3728 printf (" -W%-21s %s\n",
3729 W_options[i].string, description);
3732 printf (" -Wid-clash-<num> Warn if 2 identifiers have the same first <num> chars\n");
3733 printf (" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n");
3734 printf (" -p Enable function profiling\n");
3735 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3736 printf (" -a Enable block profiling \n");
3738 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3739 printf (" -ax Enable jump profiling \n");
3741 printf (" -o <file> Place output into <file> \n");
3742 printf (" -G <number> Put global and static data smaller than <number>\n");
3743 printf (" bytes into a special section (on some targets)\n");
3745 for (i = NUM_ELEM (debug_args); i--;)
3747 if (debug_args[i].description != NULL)
3748 printf (" -g%-21s %s\n", debug_args[i].arg, debug_args[i].description);
3751 printf (" -aux-info <file> Emit declaration info into <file>.X\n");
3752 printf (" -quiet Do not display functions compiled or elapsed time\n");
3753 printf (" -version Display the compiler's version\n");
3754 printf (" -d[letters] Enable dumps from specific passes of the compiler\n");
3755 printf (" -dumpbase <file> Base name to be used for dumps from specific passes\n");
3756 #if defined INSN_SCHEDULING
3757 printf (" -fsched-verbose=<number> Set the verbosity level of the scheduler\n");
3759 printf (" --help Display this information\n");
3764 /* Display descriptions of language specific options.
3765 If there is no description, note that there is an undocumented option.
3766 If the description is empty, do not display anything. (This allows
3767 options to be deliberately undocumented, for whatever reason).
3768 If the option string is missing, then this is a marker, indicating
3769 that the description string is in fact the name of a language, whose
3770 language specific options are to follow. */
3772 if (NUM_ELEM (documented_lang_options) > 1)
3774 printf ("\nLanguage specific options:\n");
3776 for (i = 0; i < NUM_ELEM (documented_lang_options); i++)
3778 const char * description = documented_lang_options[i].description;
3779 const char * option = documented_lang_options[i].option;
3781 if (description == NULL)
3786 printf (" %-23.23s [undocumented]\n", option);
3788 else if (* description == 0)
3790 else if (option == NULL)
3794 ("\nThere are undocumented %s specific options as well.\n",
3798 printf ("\n Options for %s:\n", description);
3803 printf (" %-23.23s %s\n", option, description);
3808 printf ("\nThere are undocumented %s specific options as well.\n", lang);
3810 if (NUM_ELEM (target_switches) > 1
3811 #ifdef TARGET_OPTIONS
3812 || NUM_ELEM (target_options) > 1
3820 printf ("\nTarget specific options:\n");
3822 for (i = NUM_ELEM (target_switches); i--;)
3824 const char * option = target_switches[i].name;
3825 const char * description = target_switches[i].description;
3827 if (option == NULL || * option == 0)
3829 else if (description == NULL)
3834 printf (" -m%-21.21s [undocumented]\n", option);
3836 else if (* description != 0)
3837 doc += printf (" -m%-21.21s %s\n", option, description);
3840 #ifdef TARGET_OPTIONS
3841 for (i = NUM_ELEM (target_options); i--;)
3843 const char * option = target_options[i].prefix;
3844 const char * description = target_options[i].description;
3846 if (option == NULL || * option == 0)
3848 else if (description == NULL)
3853 printf (" -m%-21.21s [undocumented]\n", option);
3855 else if (* description != 0)
3856 doc += printf (" -m%-21.21s %s\n", option, description);
3862 printf ("\nThere are undocumented target specific options as well.\n");
3864 printf (" They exist, but they are not documented.\n");
3869 /* Parse a -d... comand line switch. */
3872 decode_d_option (arg)
3881 for (i = 0; i < DFI_MAX; ++i)
3882 dump_file[i].enabled = 1;
3891 flag_print_asm_name = 1;
3894 graph_dump_format = vcg;
3897 rtl_dump_and_exit = 1;
3902 case 'D': /* These are handled by the preprocessor. */
3908 for (i = 0; i < DFI_MAX; ++i)
3909 if (c == dump_file[i].debug_switch)
3911 dump_file[i].enabled = 1;
3916 warning ("unrecognized gcc debugging option: %c", c);
3921 /* Parse a -f... comand line switch. ARG is the value after the -f.
3922 It is safe to access 'ARG - 2' to generate the full switch name.
3923 Return the number of strings consumed. */
3926 decode_f_option (arg)
3931 /* Search for the option in the table of binary f options. */
3932 for (j = sizeof (f_options) / sizeof (f_options[0]); j--;)
3934 if (!strcmp (arg, f_options[j].string))
3936 *f_options[j].variable = f_options[j].on_value;
3940 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3941 && ! strcmp (arg + 3, f_options[j].string))
3943 *f_options[j].variable = ! f_options[j].on_value;
3948 if (!strncmp (arg, "inline-limit-", 13)
3949 || !strncmp (arg, "inline-limit=", 13))
3951 read_integral_parameter (arg + 13, arg - 2, inline_max_insns);
3952 #ifdef INSN_SCHEDULING
3953 else if (!strncmp (arg, "sched-verbose=", 14))
3954 fix_sched_param ("verbose", (const char *)(arg + 14));
3956 else if (!strncmp (arg, "fixed-", 6))
3957 fix_register ((const char *)(arg + 6), 1, 1);
3958 else if (!strncmp (arg, "call-used-", 10))
3959 fix_register ((const char *)(arg + 10), 0, 1);
3960 else if (!strncmp (arg, "call-saved-", 11))
3961 fix_register ((const char *)(arg + 11), 0, 0);
3962 else if (!strncmp (arg, "align-loops=", 12))
3963 align_loops = read_integral_parameter (arg + 12, arg - 2, align_loops);
3964 else if (!strncmp (arg, "align-functions=", 16))
3966 = read_integral_parameter (arg + 16, arg - 2, align_functions);
3967 else if (!strncmp (arg, "align-jumps=", 12))
3968 align_jumps = read_integral_parameter (arg + 12, arg - 2, align_jumps);
3969 else if (!strncmp (arg, "align-labels=", 13))
3970 align_labels = read_integral_parameter (arg + 13, arg - 2, align_labels);
3971 else if (!strncmp (arg, "stack-limit-register=", 21))
3973 int reg = decode_reg_name (arg + 21);
3975 error ("unrecognized register name `%s'", arg + 21);
3977 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3979 else if (!strncmp (arg, "stack-limit-symbol=", 19))
3983 nm = ggc_alloc_string (arg + 19, strlen (arg + 19));
3985 nm = xstrdup (arg + 19);
3986 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3988 else if (!strcmp (arg, "no-stack-limit"))
3989 stack_limit_rtx = NULL_RTX;
3990 else if (!strcmp (arg, "preprocessed"))
3991 /* Recognise this switch but do nothing. This prevents warnings
3992 about an unrecognized switch if cpplib has not been linked in. */
4000 /* Parse a -W... comand line switch. ARG is the value after the -W.
4001 It is safe to access 'ARG - 2' to generate the full switch name.
4002 Return the number of strings consumed. */
4005 decode_W_option (arg)
4010 /* Search for the option in the table of binary W options. */
4012 for (j = sizeof (W_options) / sizeof (W_options[0]); j--;)
4014 if (!strcmp (arg, W_options[j].string))
4016 *W_options[j].variable = W_options[j].on_value;
4020 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4021 && ! strcmp (arg + 3, W_options[j].string))
4023 *W_options[j].variable = ! W_options[j].on_value;
4028 if (!strncmp (arg, "id-clash-", 9))
4030 id_clash_len = read_integral_parameter (arg + 9, arg - 2, -1);
4032 if (id_clash_len != -1)
4035 else if (!strncmp (arg, "larger-than-", 12))
4037 larger_than_size = read_integral_parameter (arg + 12, arg - 2, -1);
4039 if (larger_than_size != -1)
4040 warn_larger_than = 1;
4048 /* Parse a -g... comand line switch. ARG is the value after the -g.
4049 It is safe to access 'ARG - 2' to generate the full switch name.
4050 Return the number of strings consumed. */
4053 decode_g_option (arg)
4057 /* A lot of code assumes write_symbols == NO_DEBUG if the
4058 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4059 of what debugging type has been selected). This records the
4060 selected type. It is an error to specify more than one
4062 static enum debug_info_type selected_debug_type = NO_DEBUG;
4063 /* Non-zero if debugging format has been explicitly set.
4064 -g and -ggdb don't explicitly set the debugging format so
4065 -gdwarf -g3 is equivalent to -gdwarf3. */
4066 static int type_explicitly_set_p = 0;
4067 /* Indexed by enum debug_info_type. */
4068 static const char * debug_type_names[] =
4070 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff"
4073 /* The maximum admissible debug level value. */
4074 static const unsigned max_debug_level = 3;
4076 /* Look up ARG in the table. */
4077 for (da = debug_args; da->arg; da++)
4079 const int da_len = strlen (da->arg);
4081 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4083 enum debug_info_type type = da->debug_type;
4084 const char * p = arg + da_len;
4086 if (*p && (*p < '0' || *p > '9'))
4089 /* A debug flag without a level defaults to level 2.
4090 Note we do not want to call read_integral_parameter
4091 for that case since it will call atoi which
4094 ??? We may want to generalize the interface to
4095 read_integral_parameter to better handle this case
4096 if this case shows up often. */
4098 level = read_integral_parameter (p, 0, max_debug_level + 1);
4102 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4104 error ("use -gdwarf -g%d for DWARF v1, level %d",
4107 error ("use -gdwarf-2 for DWARF v2");
4110 if (level > max_debug_level)
4113 ignoring option `%s' due to invalid debug level specification",
4115 level = debug_info_level;
4118 if (type == NO_DEBUG)
4120 type = PREFERRED_DEBUGGING_TYPE;
4122 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4124 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4125 type = DWARF2_DEBUG;
4127 #ifdef DBX_DEBUGGING_INFO
4134 if (type == NO_DEBUG)
4135 warning ("`%s': unknown or unsupported -g option", arg - 2);
4137 /* Does it conflict with an already selected type? */
4138 if (type_explicitly_set_p
4139 /* -g/-ggdb don't conflict with anything */
4140 && da->debug_type != NO_DEBUG
4141 && type != selected_debug_type)
4142 warning ("`%s' ignored, conflicts with `-g%s'",
4143 arg - 2, debug_type_names[(int) selected_debug_type]);
4146 /* If the format has already been set, -g/-ggdb
4147 only change the debug level. */
4148 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4149 ; /* don't change debugging type */
4152 selected_debug_type = type;
4153 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4156 write_symbols = (level == 0
4158 : selected_debug_type);
4159 use_gnu_debug_info_extensions = da->use_extensions_p;
4160 debug_info_level = (enum debug_info_level) level;
4168 warning ("`%s': unknown or unsupported -g option", arg - 2);
4173 /* Decode the first argument in the argv as a language-independent option.
4174 Return the number of strings consumed. 'strings_processed' is the
4175 number of strings that have already been decoded in a language
4176 specific fashion before this function was invoked. */
4179 independent_decode_option (argc, argv, strings_processed)
4182 unsigned int strings_processed;
4184 char *arg = argv[0];
4186 if (arg[0] != '-' || arg[1] == 0)
4198 if (!strcmp (arg, "-help"))
4213 /* Already been treated in main (). Do nothing. */
4217 set_target_switch (arg + 1);
4221 return decode_f_option (arg + 1);
4224 if (strings_processed == 0)
4225 return decode_g_option (arg + 1);
4227 return strings_processed;
4230 if (!strcmp (arg, "dumpbase"))
4235 dump_base_name = argv[1];
4239 decode_d_option (arg + 1);
4243 if (!strcmp (arg, "pedantic"))
4245 else if (!strcmp (arg, "pedantic-errors"))
4246 flag_pedantic_errors = pedantic = 1;
4247 else if (arg[1] == 0)
4254 if (!strcmp (arg, "quiet"))
4261 if (!strcmp (arg, "version"))
4269 inhibit_warnings = 1;
4278 /* We save the value of warn_uninitialized, since if they put
4279 -Wuninitialized on the command line, we need to generate a
4280 warning about not using it without also specifying -O. */
4281 if (warn_uninitialized != 1)
4282 warn_uninitialized = 2;
4285 return decode_W_option (arg + 1);
4291 #if !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4292 warning ("`-a' option (basic block profile) not supported");
4294 profile_block_flag = (profile_block_flag < 2) ? 1 : 3;
4297 else if (!strcmp (arg, "ax"))
4299 #if !defined (FUNCTION_BLOCK_PROFILER_EXIT) || !defined (BLOCK_PROFILER) || !defined (FUNCTION_BLOCK_PROFILER)
4300 warning ("`-ax' option (jump profiling) not supported");
4302 profile_block_flag = (!profile_block_flag
4303 || profile_block_flag == 2) ? 2 : 3;
4306 else if (!strncmp (arg, "aux-info", 8))
4308 flag_gen_aux_info = 1;
4314 aux_info_file_name = argv[1];
4318 aux_info_file_name = arg + 8;
4330 asm_file_name = argv[1];
4345 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4350 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4354 if (g_switch_val == -1)
4358 g_switch_set = TRUE;
4359 g_switch_value = g_switch_val;
4369 /* Entry point of cc1/c++. Decode command args, then call compile_file.
4370 Exit code is 35 if can't open files, 34 if fatal error,
4371 33 if had nonfatal errors, else success. */
4373 extern int main PARAMS ((int, char **));
4383 /* save in case md file wants to emit args as a comment. */
4387 p = argv[0] + strlen (argv[0]);
4388 while (p != argv[0] && p[-1] != '/'
4389 #ifdef DIR_SEPARATOR
4390 && p[-1] != DIR_SEPARATOR
4396 #ifdef HAVE_LC_MESSAGES
4397 setlocale (LC_MESSAGES, "");
4399 (void) bindtextdomain (PACKAGE, localedir);
4400 (void) textdomain (PACKAGE);
4402 signal (SIGFPE, float_signal);
4405 signal (SIGPIPE, pipe_closed);
4408 decl_printable_name = decl_name;
4409 lang_expand_expr = (lang_expand_expr_t) do_abort;
4411 /* Initialize whether `char' is signed. */
4412 flag_signed_char = DEFAULT_SIGNED_CHAR;
4413 #ifdef DEFAULT_SHORT_ENUMS
4414 /* Initialize how much space enums occupy, by default. */
4415 flag_short_enums = DEFAULT_SHORT_ENUMS;
4418 /* Initialize the garbage-collector. */
4420 ggc_add_root (&input_file_stack, 1, sizeof input_file_stack,
4422 ggc_add_rtx_root (&stack_limit_rtx, 1);
4423 ggc_add_tree_root (¤t_function_decl, 1);
4424 ggc_add_tree_root (¤t_function_func_begin_label, 1);
4426 /* Perform language-specific options intialization. */
4427 lang_init_options ();
4429 /* Scan to see what optimization level has been specified. That will
4430 determine the default value of many flags. */
4431 for (i = 1; i < argc; i++)
4433 if (!strcmp (argv[i], "-O"))
4438 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4440 /* Handle -Os, -O2, -O3, -O69, ... */
4441 char *p = &argv[i][2];
4443 if ((p[0] == 's') && (p[1] == 0))
4447 /* Optimizing for size forces optimize to be 2. */
4452 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4453 if (optimize_val != -1)
4455 optimize = optimize_val;
4465 flag_thread_jumps = 1;
4467 flag_delayed_branch = 1;
4469 #ifdef CAN_DEBUG_WITHOUT_FP
4470 flag_omit_frame_pointer = 1;
4476 flag_optimize_sibling_calls = 1;
4477 flag_cse_follow_jumps = 1;
4478 flag_cse_skip_blocks = 1;
4480 flag_expensive_optimizations = 1;
4481 flag_strength_reduce = 1;
4482 flag_rerun_cse_after_loop = 1;
4483 flag_rerun_loop_opt = 1;
4484 flag_caller_saves = 1;
4487 #ifdef INSN_SCHEDULING
4488 flag_schedule_insns = 1;
4489 flag_schedule_insns_after_reload = 1;
4492 flag_strict_aliasing = 1;
4493 flag_delete_null_pointer_checks = 1;
4498 flag_inline_functions = 1;
4501 if (optimize < 2 || optimize_size)
4506 align_functions = 1;
4509 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4512 set_target_switch ("");
4514 #ifdef OPTIMIZATION_OPTIONS
4515 /* Allow default optimizations to be specified on a per-machine basis. */
4516 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4519 /* Initialize register usage now so switches may override. */
4522 /* Perform normal command line switch decoding. */
4523 for (i = 1; i < argc;)
4525 unsigned int lang_processed;
4526 unsigned int indep_processed;
4528 /* Give the language a chance to decode the option for itself. */
4529 lang_processed = lang_decode_option (argc - i, argv + i);
4531 /* Now see if the option also has a language independent meaning.
4532 Some options are both language specific and language independent,
4533 eg --help. It is possible that there might be options that should
4534 only be decoded in a language independent way if they were not
4535 decoded in a langauge specific way, which is why 'lang_processed'
4537 indep_processed = independent_decode_option (argc - i, argv + i,
4540 if (lang_processed || indep_processed)
4541 i += (lang_processed > indep_processed
4542 ? lang_processed : indep_processed);
4545 const char * option = NULL;
4546 const char * lang = NULL;
4549 /* It is possible that the command line switch is not valid for the
4550 current language, but it is valid for another language. In order
4551 to be compatible with previous versions of the compiler (which
4552 did not issue an error message in this case) we check for this
4553 possibilty here. If we do find a match, then if extra_warnings
4554 is set we generate a warning message, otherwise we will just
4555 ignore the option. */
4556 for (j = 0; j < NUM_ELEM (documented_lang_options); j++)
4558 option = documented_lang_options[j].option;
4561 lang = documented_lang_options[j].description;
4562 else if (! strncmp (argv[i], option, strlen (option)))
4566 if (j != NUM_ELEM (documented_lang_options))
4570 warning ("Ignoring command line option '%s'", argv[i]);
4573 (It is valid for %s but not the selected langauge)", lang);
4577 error ("Unrecognized option `%s'", argv[i]);
4583 /* Checker uses the frame pointer. */
4584 if (flag_check_memory_usage)
4585 flag_omit_frame_pointer = 0;
4589 /* Inlining does not work if not optimizing,
4590 so force it not to be done. */
4594 /* The c_decode_option and lang_decode_option functions set
4595 this to `2' if -Wall is used, so we can avoid giving out
4596 lots of errors for people who don't realize what -Wall does. */
4597 if (warn_uninitialized == 1)
4598 warning ("-Wuninitialized is not supported without -O");
4601 #ifdef OVERRIDE_OPTIONS
4602 /* Some machines may reject certain combinations of options. */
4606 if (exceptions_via_longjmp == 2)
4608 #ifdef DWARF2_UNWIND_INFO
4609 exceptions_via_longjmp = ! DWARF2_UNWIND_INFO;
4611 exceptions_via_longjmp = 1;
4615 /* Set up the align_*_log variables, defaulting them to 1 if they
4616 were still unset. */
4617 if (align_loops <= 0) align_loops = 1;
4618 align_loops_log = floor_log2 (align_loops*2-1);
4619 if (align_jumps <= 0) align_jumps = 1;
4620 align_jumps_log = floor_log2 (align_jumps*2-1);
4621 if (align_labels <= 0) align_labels = 1;
4622 align_labels_log = floor_log2 (align_labels*2-1);
4623 if (align_functions <= 0) align_functions = 1;
4624 align_functions_log = floor_log2 (align_functions*2-1);
4626 if (profile_block_flag == 3)
4628 warning ("`-ax' and `-a' are conflicting options. `-a' ignored.");
4629 profile_block_flag = 2;
4632 /* Unrolling all loops implies that standard loop unrolling must also
4634 if (flag_unroll_all_loops)
4635 flag_unroll_loops = 1;
4636 /* Loop unrolling requires that strength_reduction be on also. Silently
4637 turn on strength reduction here if it isn't already on. Also, the loop
4638 unrolling code assumes that cse will be run after loop, so that must
4639 be turned on also. */
4640 if (flag_unroll_loops)
4642 flag_strength_reduce = 1;
4643 flag_rerun_cse_after_loop = 1;
4646 /* Warn about options that are not supported on this machine. */
4647 #ifndef INSN_SCHEDULING
4648 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4649 warning ("instruction scheduling not supported on this target machine");
4652 if (flag_delayed_branch)
4653 warning ("this target machine does not have delayed branches");
4656 user_label_prefix = USER_LABEL_PREFIX;
4657 if (flag_leading_underscore != -1)
4659 /* If the default prefix is more complicated than "" or "_",
4660 issue a warning and ignore this option. */
4661 if (user_label_prefix[0] == 0 ||
4662 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4664 user_label_prefix = flag_leading_underscore ? "_" : "";
4667 warning ("-f%sleading-underscore not supported on this target machine",
4668 flag_leading_underscore ? "" : "no-");
4671 /* If we are in verbose mode, write out the version and maybe all the
4672 option flags in use. */
4675 print_version (stderr, "");
4677 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4680 compile_file (filename);
4682 #if !defined(OS2) && !defined(VMS) && (!defined(_WIN32) || defined (__CYGWIN__)) && !defined(__INTERIX)
4685 char *lim = (char *) sbrk (0);
4687 fnotice (stderr, "Data size %ld.\n", (long) (lim - (char *) &environ));
4692 system ("ps -l 1>&2");
4695 #endif /* not USG */
4698 #endif /* ! OS2 && ! VMS && (! _WIN32 || CYGWIN) && ! __INTERIX */
4701 return (FATAL_EXIT_CODE);
4703 return (FATAL_EXIT_CODE);
4704 return (SUCCESS_EXIT_CODE);
4707 /* Decode -m switches. */
4708 /* Decode the switch -mNAME. */
4711 set_target_switch (name)
4715 int valid_target_option = 0;
4717 for (j = 0; j < sizeof target_switches / sizeof target_switches[0]; j++)
4718 if (!strcmp (target_switches[j].name, name))
4720 if (target_switches[j].value < 0)
4721 target_flags &= ~-target_switches[j].value;
4723 target_flags |= target_switches[j].value;
4724 valid_target_option = 1;
4727 #ifdef TARGET_OPTIONS
4728 if (!valid_target_option)
4729 for (j = 0; j < sizeof target_options / sizeof target_options[0]; j++)
4731 int len = strlen (target_options[j].prefix);
4732 if (!strncmp (target_options[j].prefix, name, len))
4734 *target_options[j].variable = name + len;
4735 valid_target_option = 1;
4740 if (!valid_target_option)
4741 error ("Invalid option `%s'", name);
4744 /* Print version information to FILE.
4745 Each line begins with INDENT (for the case where FILE is the
4746 assembler output file). */
4749 print_version (file, indent)
4754 #define __VERSION__ "[?]"
4758 "%s%s%s version %s (%s) compiled by GNU C version %s.\n"
4760 "%s%s%s version %s (%s) compiled by CC.\n"
4762 , indent, *indent != 0 ? " " : "",
4763 language_string, version_string, TARGET_NAME, __VERSION__);
4766 /* Print an option value and return the adjusted position in the line.
4767 ??? We don't handle error returns from fprintf (disk full); presumably
4768 other code will catch a disk full though. */
4771 print_single_switch (file, pos, max, indent, sep, term, type, name)
4774 const char *indent, *sep, *term, *type, *name;
4776 /* The ultrix fprintf returns 0 on success, so compute the result we want
4777 here since we need it for the following test. */
4778 int len = strlen (sep) + strlen (type) + strlen (name);
4783 fprintf (file, "%s", term);
4788 fprintf (file, "%s", indent);
4789 pos = strlen (indent);
4791 fprintf (file, "%s%s%s", sep, type, name);
4796 /* Print active target switches to FILE.
4797 POS is the current cursor position and MAX is the size of a "line".
4798 Each line begins with INDENT and ends with TERM.
4799 Each switch is separated from the next by SEP. */
4802 print_switch_values (file, pos, max, indent, sep, term)
4805 const char *indent, *sep, *term;
4810 /* Print the options as passed. */
4812 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4813 _("options passed: "), "");
4815 for (p = &save_argv[1]; *p != NULL; p++)
4819 if (strcmp (*p, "-o") == 0)
4825 if (strcmp (*p, "-quiet") == 0)
4827 if (strcmp (*p, "-version") == 0)
4832 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4835 fprintf (file, "%s", term);
4837 /* Print the -f and -m options that have been enabled.
4838 We don't handle language specific options but printing argv
4841 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4842 _("options enabled: "), "");
4844 for (j = 0; j < sizeof f_options / sizeof f_options[0]; j++)
4845 if (*f_options[j].variable == f_options[j].on_value)
4846 pos = print_single_switch (file, pos, max, indent, sep, term,
4847 "-f", f_options[j].string);
4849 /* Print target specific options. */
4851 for (j = 0; j < sizeof target_switches / sizeof target_switches[0]; j++)
4852 if (target_switches[j].name[0] != '\0'
4853 && target_switches[j].value > 0
4854 && ((target_switches[j].value & target_flags)
4855 == target_switches[j].value))
4857 pos = print_single_switch (file, pos, max, indent, sep, term,
4858 "-m", target_switches[j].name);
4861 #ifdef TARGET_OPTIONS
4862 for (j = 0; j < sizeof target_options / sizeof target_options[0]; j++)
4863 if (*target_options[j].variable != NULL)
4866 sprintf (prefix, "-m%s", target_options[j].prefix);
4867 pos = print_single_switch (file, pos, max, indent, sep, term,
4868 prefix, *target_options[j].variable);
4872 fprintf (file, "%s", term);
4875 /* Record the beginning of a new source file, named FILENAME. */
4878 debug_start_source_file (filename)
4879 register char *filename ATTRIBUTE_UNUSED;
4881 #ifdef DBX_DEBUGGING_INFO
4882 if (write_symbols == DBX_DEBUG)
4883 dbxout_start_new_source_file (filename);
4885 #ifdef DWARF_DEBUGGING_INFO
4886 if (debug_info_level == DINFO_LEVEL_VERBOSE
4887 && write_symbols == DWARF_DEBUG)
4888 dwarfout_start_new_source_file (filename);
4889 #endif /* DWARF_DEBUGGING_INFO */
4890 #ifdef DWARF2_DEBUGGING_INFO
4891 if (debug_info_level == DINFO_LEVEL_VERBOSE
4892 && write_symbols == DWARF2_DEBUG)
4893 dwarf2out_start_source_file (filename);
4894 #endif /* DWARF2_DEBUGGING_INFO */
4895 #ifdef SDB_DEBUGGING_INFO
4896 if (write_symbols == SDB_DEBUG)
4897 sdbout_start_new_source_file (filename);
4901 /* Record the resumption of a source file. LINENO is the line number in
4902 the source file we are returning to. */
4905 debug_end_source_file (lineno)
4906 register unsigned lineno ATTRIBUTE_UNUSED;
4908 #ifdef DBX_DEBUGGING_INFO
4909 if (write_symbols == DBX_DEBUG)
4910 dbxout_resume_previous_source_file ();
4912 #ifdef DWARF_DEBUGGING_INFO
4913 if (debug_info_level == DINFO_LEVEL_VERBOSE
4914 && write_symbols == DWARF_DEBUG)
4915 dwarfout_resume_previous_source_file (lineno);
4916 #endif /* DWARF_DEBUGGING_INFO */
4917 #ifdef DWARF2_DEBUGGING_INFO
4918 if (debug_info_level == DINFO_LEVEL_VERBOSE
4919 && write_symbols == DWARF2_DEBUG)
4920 dwarf2out_end_source_file ();
4921 #endif /* DWARF2_DEBUGGING_INFO */
4922 #ifdef SDB_DEBUGGING_INFO
4923 if (write_symbols == SDB_DEBUG)
4924 sdbout_resume_previous_source_file ();
4928 /* Called from check_newline in c-parse.y. The `buffer' parameter contains
4929 the tail part of the directive line, i.e. the part which is past the
4930 initial whitespace, #, whitespace, directive-name, whitespace part. */
4933 debug_define (lineno, buffer)
4934 register unsigned lineno ATTRIBUTE_UNUSED;
4935 register char *buffer ATTRIBUTE_UNUSED;
4937 #ifdef DWARF_DEBUGGING_INFO
4938 if (debug_info_level == DINFO_LEVEL_VERBOSE
4939 && write_symbols == DWARF_DEBUG)
4940 dwarfout_define (lineno, buffer);
4941 #endif /* DWARF_DEBUGGING_INFO */
4942 #ifdef DWARF2_DEBUGGING_INFO
4943 if (debug_info_level == DINFO_LEVEL_VERBOSE
4944 && write_symbols == DWARF2_DEBUG)
4945 dwarf2out_define (lineno, buffer);
4946 #endif /* DWARF2_DEBUGGING_INFO */
4949 /* Called from check_newline in c-parse.y. The `buffer' parameter contains
4950 the tail part of the directive line, i.e. the part which is past the
4951 initial whitespace, #, whitespace, directive-name, whitespace part. */
4954 debug_undef (lineno, buffer)
4955 register unsigned lineno ATTRIBUTE_UNUSED;
4956 register char *buffer ATTRIBUTE_UNUSED;
4958 #ifdef DWARF_DEBUGGING_INFO
4959 if (debug_info_level == DINFO_LEVEL_VERBOSE
4960 && write_symbols == DWARF_DEBUG)
4961 dwarfout_undef (lineno, buffer);
4962 #endif /* DWARF_DEBUGGING_INFO */
4963 #ifdef DWARF2_DEBUGGING_INFO
4964 if (debug_info_level == DINFO_LEVEL_VERBOSE
4965 && write_symbols == DWARF2_DEBUG)
4966 dwarf2out_undef (lineno, buffer);
4967 #endif /* DWARF2_DEBUGGING_INFO */
4970 /* Tell the debugging backend that we've decided not to emit any
4971 debugging information for BLOCK, so it can clean up after any local
4972 classes or nested functions. */
4975 debug_ignore_block (block)
4976 tree block ATTRIBUTE_UNUSED;
4978 #ifdef DWARF2_DEBUGGING_INFO
4979 if (write_symbols == DWARF2_DEBUG)
4980 dwarf2out_ignore_block (block);