1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
66 #include "diagnostic.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
81 #include "value-prof.h"
82 #include "alloc-pool.h"
84 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
85 #include "dwarf2out.h"
88 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
92 #ifdef SDB_DEBUGGING_INFO
96 #ifdef XCOFF_DEBUGGING_INFO
97 #include "xcoffout.h" /* Needed for external data
98 declarations for e.g. AIX 4.x. */
101 static void general_init (const char *);
102 static void do_compile (void);
103 static void process_options (void);
104 static void backend_init (void);
105 static int lang_dependent_init (const char *);
106 static void init_asm_output (const char *);
107 static void finalize (void);
109 static void crash_signal (int) ATTRIBUTE_NORETURN
;
110 static void setup_core_dumping (void);
111 static void compile_file (void);
113 static int print_single_switch (FILE *, int, int, const char *,
114 const char *, const char *,
115 const char *, const char *);
116 static void print_switch_values (FILE *, int, int, const char *,
117 const char *, const char *);
119 /* Nonzero to dump debug info whilst parsing (-dy option). */
120 static int set_yydebug
;
122 /* True if we don't need a backend (e.g. preprocessing only). */
123 static bool no_backend
;
125 /* Length of line when printing switch values. */
128 /* Name of program invoked, sans directories. */
130 const char *progname
;
132 /* Copy of argument vector to toplev_main. */
133 static const char **save_argv
;
135 /* Name of top-level original source file (what was input to cpp).
136 This comes from the #-command at the beginning of the actual input.
137 If there isn't any there, then this is the cc1 input file name. */
139 const char *main_input_filename
;
141 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
142 to optimize and default_debug_hooks in process_options (). */
143 #define AUTODETECT_FLAG_VAR_TRACKING 2
145 /* Current position in real source file. */
147 location_t input_location
;
149 struct line_maps line_table
;
151 /* Nonzero if it is unsafe to create any new pseudo registers. */
154 /* Stack of currently pending input files. */
156 struct file_stack
*input_file_stack
;
158 /* Incremented on each change to input_file_stack. */
159 int input_file_stack_tick
;
161 /* Name to use as base of names for dump output files. */
163 const char *dump_base_name
;
165 /* Name to use as a base for auxiliary output files. */
167 const char *aux_base_name
;
169 /* Bit flags that specify the machine subtype we are compiling for.
170 Bits are tested using macros TARGET_... defined in the tm.h file
171 and set by `-m...' switches. Must be defined in rtlanal.c. */
173 extern int target_flags
;
175 /* A mask of target_flags that includes bit X if X was set or cleared
176 on the command line. */
178 int target_flags_explicit
;
180 /* Debug hooks - dependent upon command line options. */
182 const struct gcc_debug_hooks
*debug_hooks
;
184 /* Debug hooks - target default. */
186 static const struct gcc_debug_hooks
*default_debug_hooks
;
188 /* Other flags saying which kinds of debugging dump have been requested. */
190 int rtl_dump_and_exit
;
191 int flag_print_asm_name
;
192 enum graph_dump_types graph_dump_format
;
194 /* Name for output file of assembly code, specified with -o. */
196 const char *asm_file_name
;
198 /* Nonzero means do optimizations. -O.
199 Particular numeric values stand for particular amounts of optimization;
200 thus, -O2 stores 2 here. However, the optimizations beyond the basic
201 ones are not controlled directly by this variable. Instead, they are
202 controlled by individual `flag_...' variables that are defaulted
203 based on this variable. */
207 /* Nonzero means optimize for size. -Os.
208 The only valid values are zero and nonzero. When optimize_size is
209 nonzero, optimize defaults to 2, but certain individual code
210 bloating optimizations are disabled. */
212 int optimize_size
= 0;
214 /* The FUNCTION_DECL for the function currently being compiled,
215 or 0 if between functions. */
216 tree current_function_decl
;
218 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
220 tree current_function_func_begin_label
;
222 /* Nonzero if doing dwarf2 duplicate elimination. */
224 int flag_eliminate_dwarf2_dups
= 0;
226 /* Nonzero if doing unused type elimination. */
228 int flag_eliminate_unused_debug_types
= 1;
230 /* Nonzero means emit debugging information only for symbols which are used. */
231 int flag_debug_only_used_symbols
= 0;
233 /* Nonzero if generating code to do profiling. */
235 int profile_flag
= 0;
237 /* Nonzero if generating code to profile program flow graph arcs. */
239 int profile_arc_flag
= 0;
241 /* Nonzero if value histograms should be measured. */
243 int flag_profile_values
= 0;
245 /* Nonzero if value histograms should be used to optimize code. */
246 int flag_value_profile_transformations
= 0;
248 /* Nonzero if generating info for gcov to calculate line test coverage. */
250 int flag_test_coverage
= 0;
252 /* Nonzero indicates that branch taken probabilities should be calculated. */
254 int flag_branch_probabilities
= 0;
256 /* Nonzero if basic blocks should be reordered. */
258 int flag_reorder_blocks
= 0;
260 /* Nonzero if blocks should be partitioned into hot and cold sections in
261 addition to being reordered. */
263 int flag_reorder_blocks_and_partition
= 0;
265 /* Nonzero if functions should be reordered. */
267 int flag_reorder_functions
= 0;
269 /* Nonzero if registers should be renamed. When
270 flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING it will be set
271 according to optimize and default_debug_hooks in process_options (),
272 but we do not do this yet because it triggers aborts in flow.c. */
273 int flag_rename_registers
= 0;
274 int flag_cprop_registers
= 0;
276 /* Nonzero for -pedantic switch: warn about anything
277 that standard spec forbids. */
281 /* Temporarily suppress certain warnings.
282 This is set while reading code from a system header file. */
284 int in_system_header
= 0;
286 /* Don't print functions as they are compiled. -quiet. */
290 /* Print times taken by the various passes. -ftime-report. */
294 /* Print memory still in use at end of compilation (which may have little
295 to do with peak memory consumption). -fmem-report. */
299 /* Nonzero means to collect statistics which might be expensive
300 and to print them when we are done. */
301 int flag_detailed_statistics
= 0;
303 /* A random sequence of characters, unless overridden by user. */
304 const char *flag_random_seed
;
306 /* A local time stamp derived from the time of compilation. It will be
307 zero if the system cannot provide a time. It will be -1u, if the
308 user has specified a particular random seed. */
313 /* Nonzero means `char' should be signed. */
315 int flag_signed_char
;
317 /* Nonzero means give an enum type only as many bytes as it needs. */
319 int flag_short_enums
;
321 /* Nonzero for -fcaller-saves: allocate values in regs that need to
322 be saved across function calls, if that produces overall better code.
323 Optional now, so people can test it. */
325 int flag_caller_saves
= 0;
327 /* Nonzero if structures and unions should be returned in memory.
329 This should only be defined if compatibility with another compiler or
330 with an ABI is needed, because it results in slower code. */
332 #ifndef DEFAULT_PCC_STRUCT_RETURN
333 #define DEFAULT_PCC_STRUCT_RETURN 1
336 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
338 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
340 /* Nonzero for -fforce-mem: load memory value into a register
341 before arithmetic on it. This makes better cse but slower compilation. */
343 int flag_force_mem
= 0;
345 /* Nonzero for -fforce-addr: load memory address into a register before
346 reference to memory. This makes better cse but slower compilation. */
348 int flag_force_addr
= 0;
350 /* Nonzero for -fdefer-pop: don't pop args after each function call;
351 instead save them up to pop many calls' args with one insns. */
353 int flag_defer_pop
= 0;
355 /* Nonzero for -ffloat-store: don't allocate floats and doubles
356 in extended-precision registers. */
358 int flag_float_store
= 0;
360 /* Nonzero for -fcse-follow-jumps:
361 have cse follow jumps to do a more extensive job. */
363 int flag_cse_follow_jumps
;
365 /* Nonzero for -fcse-skip-blocks:
366 have cse follow a branch around a block. */
367 int flag_cse_skip_blocks
;
369 /* Nonzero for -fexpensive-optimizations:
370 perform miscellaneous relatively-expensive optimizations. */
371 int flag_expensive_optimizations
;
373 /* Nonzero for -fthread-jumps:
374 have jump optimize output of loop. */
376 int flag_thread_jumps
;
378 /* Nonzero enables strength-reduction in loop.c. */
380 int flag_strength_reduce
= 0;
382 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
383 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
384 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
387 int flag_old_unroll_loops
;
389 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
390 This is generally not a win. */
392 int flag_old_unroll_all_loops
;
394 /* Enables unrolling of simple loops in loop-unroll.c. */
395 int flag_unroll_loops
;
397 /* Enables unrolling of all loops in loop-unroll.c. */
398 int flag_unroll_all_loops
;
400 /* Nonzero enables loop peeling. */
403 /* Nonzero enables loop unswitching. */
404 int flag_unswitch_loops
;
406 /* Nonzero enables prefetch optimizations for arrays in loops. */
408 int flag_prefetch_loop_arrays
;
410 /* Nonzero forces all invariant computations in loops to be moved
413 int flag_move_all_movables
= 0;
415 /* Nonzero forces all general induction variables in loops to be
418 int flag_reduce_all_givs
= 0;
420 /* Nonzero to perform full register move optimization passes. This is the
423 int flag_regmove
= 0;
425 /* Nonzero means don't put addresses of constant functions in registers.
426 Used for compiling the Unix kernel, where strange substitutions are
427 done on the assembly output. */
429 int flag_no_function_cse
= 0;
431 /* Nonzero for -fomit-frame-pointer:
432 don't make a frame pointer in simple functions that don't require one. */
434 int flag_omit_frame_pointer
= 0;
436 /* Nonzero means place each function into its own section on those platforms
437 which support arbitrary section names and unlimited numbers of sections. */
439 int flag_function_sections
= 0;
441 /* ... and similar for data. */
443 int flag_data_sections
= 0;
445 /* Nonzero to inhibit use of define_optimization peephole opts. */
447 int flag_no_peephole
= 0;
449 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
451 int flag_optimize_sibling_calls
= 0;
453 /* Nonzero means the front end generally wants `errno' maintained by math
454 operations, like built-in SQRT. */
456 int flag_errno_math
= 1;
458 /* Nonzero means that unsafe floating-point math optimizations are allowed
459 for the sake of speed. IEEE compliance is not guaranteed, and operations
460 are allowed to assume that their arguments and results are "normal"
461 (e.g., nonnegative for SQRT). */
463 int flag_unsafe_math_optimizations
= 0;
465 /* Nonzero means that no NaNs or +-Infs are expected. */
467 int flag_finite_math_only
= 0;
469 /* Zero means that floating-point math operations cannot generate a
470 (user-visible) trap. This is the case, for example, in nonstop
471 IEEE 754 arithmetic. Trapping conditions include division by zero,
472 overflow, underflow, invalid and inexact, but does not include
473 operations on signaling NaNs (see below). */
475 int flag_trapping_math
= 1;
477 /* Nonzero means disable transformations that assume default floating
478 point rounding behavior. */
480 int flag_rounding_math
= 0;
482 /* Nonzero means disable transformations observable by signaling NaNs.
483 This option implies that any operation on an IEEE signaling NaN can
484 generate a (user-visible) trap. */
486 int flag_signaling_nans
= 0;
488 /* 0 means straightforward implementation of complex divide acceptable.
489 1 means wide ranges of inputs must work for complex divide.
490 2 means C99-like requirements for complex divide (not yet implemented). */
492 int flag_complex_divide_method
= 0;
494 /* Nonzero means just do syntax checking; don't output anything. */
496 int flag_syntax_only
= 0;
498 /* Nonzero means performs web construction pass. When flag_web ==
499 AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize
500 and default_debug_hooks in process_options (). */
502 int flag_web
= AUTODETECT_FLAG_VAR_TRACKING
;
504 /* Nonzero means perform loop optimizer. */
506 int flag_loop_optimize
;
508 /* Nonzero means perform crossjumping. */
510 int flag_crossjumping
;
512 /* Nonzero means perform if conversion. */
514 int flag_if_conversion
;
516 /* Nonzero means perform if conversion after reload. */
518 int flag_if_conversion2
;
520 /* Nonzero means to use global dataflow analysis to eliminate
521 useless null pointer tests. */
523 int flag_delete_null_pointer_checks
;
525 /* Nonzero means perform global CSE. */
529 /* Nonzero means to do the enhanced load motion during gcse, which trys
530 to hoist loads by not killing them when a store to the same location
533 int flag_gcse_lm
= 1;
535 /* Nonzero means to perform store motion after gcse, which will try to
536 move stores closer to the exit block. Its not very effective without
539 int flag_gcse_sm
= 1;
541 /* Nonzero if we want to perform redundant load after store elimination
544 int flag_gcse_las
= 1;
546 /* Nonzero means perform global cse after register allocation. */
547 int flag_gcse_after_reload
= 0;
549 /* Perform target register optimization before prologue / epilogue
552 int flag_branch_target_load_optimize
= 0;
554 /* Perform target register optimization after prologue / epilogue
555 threading and jump2. */
557 int flag_branch_target_load_optimize2
= 0;
559 /* For the bt-load pass, nonzero means don't re-use branch target registers
560 in any basic block. */
562 int flag_btr_bb_exclusive
;
564 /* Nonzero means to rerun cse after loop optimization. This increases
565 compilation time about 20% and picks up a few more common expressions. */
567 int flag_rerun_cse_after_loop
;
569 /* Nonzero means to run loop optimizations twice. */
571 int flag_rerun_loop_opt
;
573 /* Nonzero for -finline-functions: ok to inline functions that look like
574 good inline candidates. */
576 int flag_inline_functions
;
578 /* Nonzero for -fkeep-inline-functions: even if we make a function
579 go inline everywhere, keep its definition around for debugging
582 int flag_keep_inline_functions
;
584 /* Nonzero means that functions will not be inlined. */
586 int flag_no_inline
= 2;
588 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
589 not just because the tree inliner turned us off. */
591 int flag_really_no_inline
= 2;
593 /* Nonzero means that we should emit static const variables
594 regardless of whether or not optimization is turned on. */
596 int flag_keep_static_consts
= 1;
598 /* Nonzero means we should be saving declaration info into a .X file. */
600 int flag_gen_aux_info
= 0;
602 /* Specified name of aux-info file. */
604 const char *aux_info_file_name
;
606 /* Nonzero means make the text shared if supported. */
608 int flag_shared_data
;
610 /* Nonzero means schedule into delayed branch slots if supported. */
612 int flag_delayed_branch
;
614 /* Nonzero if we are compiling pure (sharable) code.
615 Value is 1 if we are doing "small" pic; value is 2 if we're doing
620 /* Nonzero if we are compiling position independent code for executable.
621 The value is 1 if we are doing "small" pic; value is 2 if we're doing
626 /* Nonzero if we are compiling code for a shared library, zero for
631 /* Set to the default thread-local storage (tls) model to use. */
633 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
635 /* Nonzero means generate extra code for exception handling and enable
636 exception handling. */
640 /* Nonzero means generate frame unwind info table when supported. */
642 int flag_unwind_tables
= 0;
644 /* Nonzero means generate frame unwind info table exact at each insn
647 int flag_asynchronous_unwind_tables
= 0;
649 /* Nonzero means don't place uninitialized global data in common storage
654 /* Nonzero means change certain warnings into errors.
655 Usually these are warnings about failure to conform to some standard. */
657 int flag_pedantic_errors
= 0;
659 /* flag_schedule_insns means schedule insns within basic blocks (before
661 flag_schedule_insns_after_reload means schedule insns after
664 int flag_schedule_insns
= 0;
665 int flag_schedule_insns_after_reload
= 0;
667 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
668 int flag_sched2_use_superblocks
= 0;
670 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
672 int flag_sched2_use_traces
= 0;
674 /* The following flags have effect only for scheduling before register
677 flag_schedule_interblock means schedule insns across basic blocks.
678 flag_schedule_speculative means allow speculative motion of non-load insns.
679 flag_schedule_speculative_load means allow speculative motion of some
681 flag_schedule_speculative_load_dangerous allows speculative motion of more
684 int flag_schedule_interblock
= 1;
685 int flag_schedule_speculative
= 1;
686 int flag_schedule_speculative_load
= 0;
687 int flag_schedule_speculative_load_dangerous
= 0;
689 /* The following flags have an effect during scheduling after register
692 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
693 of stalled insns into the ready list.
695 flag_sched_stalled_insns_dep controls how many insn groups will be examined
696 for a dependency on a stalled insn that is candidate for premature removal
697 from the queue of stalled insns into the ready list (has an effect only if
698 the flag 'sched_stalled_insns' is set). */
700 int flag_sched_stalled_insns
= 0;
701 int flag_sched_stalled_insns_dep
= 1;
703 int flag_single_precision_constant
;
705 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
706 by a cheaper branch on a count register. */
707 int flag_branch_on_count_reg
= 1;
709 /* -finhibit-size-directive inhibits output of .size for ELF.
710 This is used only for compiling crtstuff.c,
711 and it may be extended to other effects
712 needed for crtstuff.c on other systems. */
713 int flag_inhibit_size_directive
= 0;
715 /* -fverbose-asm causes extra commentary information to be produced in
716 the generated assembly code (to make it more readable). This option
717 is generally only of use to those who actually need to read the
718 generated assembly code (perhaps while debugging the compiler itself).
719 -fno-verbose-asm, the default, causes the extra information
720 to be omitted and is useful when comparing two assembler files. */
722 int flag_verbose_asm
= 0;
724 /* -dA causes debug commentary information to be produced in
725 the generated assembly code (to make it more readable). This option
726 is generally only of use to those who actually need to read the
727 generated assembly code (perhaps while debugging the compiler itself).
728 Currently, this switch is only used by dwarfout.c; however, it is intended
729 to be a catchall for printing debug information in the assembler file. */
731 int flag_debug_asm
= 0;
733 /* -dP causes the rtl to be emitted as a comment in assembly. */
735 int flag_dump_rtl_in_asm
= 0;
737 /* Nonzero means put zero initialized data in the bss section. */
738 int flag_zero_initialized_in_bss
= 1;
740 /* Tag all structures with __attribute__(packed). */
741 int flag_pack_struct
= 0;
743 /* Emit code to check for stack overflow; also may cause large objects
744 to be allocated dynamically. */
745 int flag_stack_check
;
747 /* When non-NULL, indicates that whenever space is allocated on the
748 stack, the resulting stack pointer must not pass this
749 address---that is, for stacks that grow downward, the stack pointer
750 must always be greater than or equal to this address; for stacks
751 that grow upward, the stack pointer must be less than this address.
752 At present, the rtx may be either a REG or a SYMBOL_REF, although
753 the support provided depends on the backend. */
756 /* 0 if pointer arguments may alias each other. True in C.
757 1 if pointer arguments may not alias each other but may alias
759 2 if pointer arguments may not alias each other and may not
760 alias global variables. True in Fortran.
761 This defaults to 0 for C. */
762 int flag_argument_noalias
= 0;
764 /* Nonzero if we should do (language-dependent) alias analysis.
765 Typically, this analysis will assume that expressions of certain
766 types do not alias expressions of certain other types. Only used
767 if alias analysis (in general) is enabled. */
768 int flag_strict_aliasing
= 0;
770 /* Instrument functions with calls at entry and exit, for profiling. */
771 int flag_instrument_function_entry_exit
= 0;
773 /* Nonzero means ignore `#ident' directives. 0 means handle them.
774 On SVR4 targets, it also controls whether or not to emit a
775 string identifying the compiler. */
777 int flag_no_ident
= 0;
779 /* This will perform a peephole pass before sched2. */
780 int flag_peephole2
= 0;
782 /* This will try to guess branch probabilities. */
783 int flag_guess_branch_prob
= 0;
785 /* -fcheck-bounds causes gcc to generate array bounds checks.
786 For C, C++, ObjC: defaults to off.
787 For Java: defaults to on.
788 For Fortran: defaults to off. */
789 int flag_bounds_check
= 0;
791 /* This will attempt to merge constant section constants, if 1 only
792 string constants and constants from constant pool, if 2 also constant
794 int flag_merge_constants
= 1;
796 /* If one, renumber instruction UIDs to reduce the number of
797 unused UIDs if there are a lot of instructions. If greater than
798 one, unconditionally renumber instruction UIDs. */
799 int flag_renumber_insns
= 1;
801 /* If nonzero, use the graph coloring register allocator. */
802 int flag_new_regalloc
= 0;
804 /* Nonzero if we perform superblock formation. */
808 /* Nonzero if we perform whole unit at a time compilation. */
810 int flag_unit_at_a_time
= 0;
812 /* Nonzero if we should track variables. When
813 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
814 to optimize, debug_info_level and debug_hooks in process_options (). */
815 int flag_var_tracking
= AUTODETECT_FLAG_VAR_TRACKING
;
817 /* Values of the -falign-* flags: how much to align labels in code.
818 0 means `use default', 1 means `don't align'.
819 For each variable, there is an _log variant which is the power
820 of two not less than the variable, for .align output. */
824 int align_loops_max_skip
;
827 int align_jumps_max_skip
;
829 int align_labels_log
;
830 int align_labels_max_skip
;
832 int align_functions_log
;
834 /* Like align_functions_log above, but used by front-ends to force the
835 minimum function alignment. Zero means no alignment is forced. */
836 int force_align_functions_log
;
840 const char *const string
;
844 lang_independent_options
;
846 /* Nonzero if signed arithmetic overflow should trap. */
849 /* Nonzero if signed arithmetic overflow should wrap around. */
852 /* Nonzero if subexpressions must be evaluated from left-to-right. */
853 int flag_evaluation_order
= 0;
855 /* Add or remove a leading underscore from user symbols. */
856 int flag_leading_underscore
= -1;
858 /* The version of the C++ ABI in use. The following values are
861 0: The version of the ABI believed most conformant with the
862 C++ ABI specification. This ABI may change as bugs are
863 discovered and fixed. Therefore, 0 will not necessarily
864 indicate the same ABI in different versions of G++.
866 1: The version of the ABI first used in G++ 3.2.
868 2: The version of the ABI first used in G++ 3.4.
870 Additional positive integers will be assigned as new versions of
871 the ABI become the default version of the ABI. */
873 int flag_abi_version
= 2;
875 /* The user symbol prefix after having resolved same. */
876 const char *user_label_prefix
;
878 static const param_info lang_independent_params
[] = {
879 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
880 { OPTION, DEFAULT, HELP },
881 #include "params.def"
886 /* Table of language-independent -f options.
887 STRING is the option name. VARIABLE is the address of the variable.
888 ON_VALUE is the value to store in VARIABLE
889 if `-fSTRING' is seen as an option.
890 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
892 static const lang_independent_options f_options
[] =
894 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups
, 1 },
895 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols
, 1 },
896 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types
, 1 },
897 {"float-store", &flag_float_store
, 1 },
898 {"defer-pop", &flag_defer_pop
, 1 },
899 {"omit-frame-pointer", &flag_omit_frame_pointer
, 1 },
900 {"optimize-sibling-calls", &flag_optimize_sibling_calls
, 1 },
901 {"tracer", &flag_tracer
, 1 },
902 {"unit-at-a-time", &flag_unit_at_a_time
, 1 },
903 {"cse-follow-jumps", &flag_cse_follow_jumps
, 1 },
904 {"cse-skip-blocks", &flag_cse_skip_blocks
, 1 },
905 {"expensive-optimizations", &flag_expensive_optimizations
, 1 },
906 {"thread-jumps", &flag_thread_jumps
, 1 },
907 {"strength-reduce", &flag_strength_reduce
, 1 },
908 {"unroll-loops", &flag_unroll_loops
, 1 },
909 {"unroll-all-loops", &flag_unroll_all_loops
, 1 },
910 {"old-unroll-loops", &flag_old_unroll_loops
, 1 },
911 {"old-unroll-all-loops", &flag_old_unroll_all_loops
, 1 },
912 {"peel-loops", &flag_peel_loops
, 1 },
913 {"unswitch-loops", &flag_unswitch_loops
, 1 },
914 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays
, 1 },
915 {"move-all-movables", &flag_move_all_movables
, 1 },
916 {"reduce-all-givs", &flag_reduce_all_givs
, 1 },
917 {"peephole", &flag_no_peephole
, 0 },
918 {"force-mem", &flag_force_mem
, 1 },
919 {"force-addr", &flag_force_addr
, 1 },
920 {"function-cse", &flag_no_function_cse
, 0 },
921 {"inline-functions", &flag_inline_functions
, 1 },
922 {"keep-inline-functions", &flag_keep_inline_functions
, 1 },
923 {"inline", &flag_no_inline
, 0 },
924 {"keep-static-consts", &flag_keep_static_consts
, 1 },
925 {"syntax-only", &flag_syntax_only
, 1 },
926 {"shared-data", &flag_shared_data
, 1 },
927 {"caller-saves", &flag_caller_saves
, 1 },
928 {"pcc-struct-return", &flag_pcc_struct_return
, 1 },
929 {"reg-struct-return", &flag_pcc_struct_return
, 0 },
930 {"delayed-branch", &flag_delayed_branch
, 1 },
931 {"web", &flag_web
, 1},
932 {"gcse", &flag_gcse
, 1 },
933 {"gcse-lm", &flag_gcse_lm
, 1 },
934 {"gcse-sm", &flag_gcse_sm
, 1 },
935 {"gcse-las", &flag_gcse_las
, 1 },
936 {"gcse-after-reload", &flag_gcse_after_reload
, 1},
937 {"branch-target-load-optimize", &flag_branch_target_load_optimize
, 1 },
938 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2
, 1 },
939 {"btr-bb-exclusive", &flag_btr_bb_exclusive
, 1 },
940 {"loop-optimize", &flag_loop_optimize
, 1 },
941 {"crossjumping", &flag_crossjumping
, 1 },
942 {"if-conversion", &flag_if_conversion
, 1 },
943 {"if-conversion2", &flag_if_conversion2
, 1 },
944 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop
, 1 },
945 {"rerun-loop-opt", &flag_rerun_loop_opt
, 1 },
946 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks
, 1 },
947 {"schedule-insns", &flag_schedule_insns
, 1 },
948 {"schedule-insns2", &flag_schedule_insns_after_reload
, 1 },
949 {"sched-interblock",&flag_schedule_interblock
, 1 },
950 {"sched-spec",&flag_schedule_speculative
, 1 },
951 {"sched-spec-load",&flag_schedule_speculative_load
, 1 },
952 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous
, 1 },
953 {"sched-stalled-insns", &flag_sched_stalled_insns
, 0 },
954 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep
, 1 },
955 {"sched2-use-superblocks", &flag_sched2_use_superblocks
, 1 },
956 {"sched2-use-traces", &flag_sched2_use_traces
, 1 },
957 {"branch-count-reg",&flag_branch_on_count_reg
, 1 },
958 {"pic", &flag_pic
, 1 },
959 {"PIC", &flag_pic
, 2 },
960 {"pie", &flag_pie
, 1 },
961 {"PIE", &flag_pie
, 2 },
962 {"exceptions", &flag_exceptions
, 1 },
963 {"unwind-tables", &flag_unwind_tables
, 1 },
964 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables
, 1 },
965 {"non-call-exceptions", &flag_non_call_exceptions
, 1 },
966 {"profile-arcs", &profile_arc_flag
, 1 },
967 {"profile-values", &flag_profile_values
, 1 },
968 {"vpt", &flag_value_profile_transformations
, 1 },
969 {"test-coverage", &flag_test_coverage
, 1 },
970 {"branch-probabilities", &flag_branch_probabilities
, 1 },
971 {"profile", &profile_flag
, 1 },
972 {"reorder-blocks", &flag_reorder_blocks
, 1 },
973 {"reorder-blocks-and-partition", &flag_reorder_blocks_and_partition
, 1},
974 {"reorder-functions", &flag_reorder_functions
, 1 },
975 {"rename-registers", &flag_rename_registers
, 1 },
976 {"cprop-registers", &flag_cprop_registers
, 1 },
977 {"common", &flag_no_common
, 0 },
978 {"inhibit-size-directive", &flag_inhibit_size_directive
, 1 },
979 {"function-sections", &flag_function_sections
, 1 },
980 {"data-sections", &flag_data_sections
, 1 },
981 {"verbose-asm", &flag_verbose_asm
, 1 },
982 {"regmove", &flag_regmove
, 1 },
983 {"optimize-register-move", &flag_regmove
, 1 },
984 {"pack-struct", &flag_pack_struct
, 1 },
985 {"stack-check", &flag_stack_check
, 1 },
986 {"argument-alias", &flag_argument_noalias
, 0 },
987 {"argument-noalias", &flag_argument_noalias
, 1 },
988 {"argument-noalias-global", &flag_argument_noalias
, 2 },
989 {"strict-aliasing", &flag_strict_aliasing
, 1 },
990 {"align-loops", &align_loops
, 0 },
991 {"align-jumps", &align_jumps
, 0 },
992 {"align-labels", &align_labels
, 0 },
993 {"align-functions", &align_functions
, 0 },
994 {"merge-constants", &flag_merge_constants
, 1 },
995 {"merge-all-constants", &flag_merge_constants
, 2 },
996 {"dump-unnumbered", &flag_dump_unnumbered
, 1 },
997 {"instrument-functions", &flag_instrument_function_entry_exit
, 1 },
998 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss
, 1 },
999 {"leading-underscore", &flag_leading_underscore
, 1 },
1000 {"ident", &flag_no_ident
, 0 },
1001 { "peephole2", &flag_peephole2
, 1 },
1002 {"finite-math-only", &flag_finite_math_only
, 1 },
1003 { "guess-branch-probability", &flag_guess_branch_prob
, 1 },
1004 {"math-errno", &flag_errno_math
, 1 },
1005 {"trapping-math", &flag_trapping_math
, 1 },
1006 {"rounding-math", &flag_rounding_math
, 1 },
1007 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations
, 1 },
1008 {"signaling-nans", &flag_signaling_nans
, 1 },
1009 {"bounds-check", &flag_bounds_check
, 1 },
1010 {"single-precision-constant", &flag_single_precision_constant
, 1 },
1011 {"time-report", &time_report
, 1 },
1012 {"mem-report", &mem_report
, 1 },
1013 { "trapv", &flag_trapv
, 1 },
1014 { "wrapv", &flag_wrapv
, 1 },
1015 { "new-ra", &flag_new_regalloc
, 1 },
1016 { "var-tracking", &flag_var_tracking
, 1}
1019 /* Here is a table, controlled by the tm.h file, listing each -m switch
1020 and which bits in `target_switches' it should set or clear.
1021 If VALUE is positive, it is bits to set.
1022 If VALUE is negative, -VALUE is bits to clear.
1023 (The sign bit is not used so there is no confusion.) */
1027 const char *const name
;
1029 const char *const description
;
1031 target_switches
[] = TARGET_SWITCHES
;
1033 /* This table is similar, but allows the switch to have a value. */
1035 #ifdef TARGET_OPTIONS
1038 const char *const prefix
;
1039 const char **const variable
;
1040 const char *const description
;
1041 const char *const value
;
1043 target_options
[] = TARGET_OPTIONS
;
1046 /* Nonzero means warn about function definitions that default the return type
1047 or that use a null return and have a return-type other than void. */
1049 int warn_return_type
;
1051 /* Output files for assembler code (real compiler output)
1052 and debugging dumps. */
1055 FILE *aux_info_file
;
1056 FILE *dump_file
= NULL
;
1057 FILE *cgraph_dump_file
= NULL
;
1059 /* The current working directory of a translation. It's generally the
1060 directory from which compilation was initiated, but a preprocessed
1061 file may specify the original directory in which it was
1064 static const char *src_pwd
;
1066 /* Initialize src_pwd with the given string, and return true. If it
1067 was already initialized, return false. As a special case, it may
1068 be called with a NULL argument to test whether src_pwd has NOT been
1072 set_src_pwd (const char *pwd
)
1076 if (strcmp (src_pwd
, pwd
) == 0)
1082 src_pwd
= xstrdup (pwd
);
1086 /* Return the directory from which the translation unit was initiated,
1087 in case set_src_pwd() was not called before to assign it a
1094 src_pwd
= getpwd ();
1099 /* Called when the start of a function definition is parsed,
1100 this function prints on stderr the name of the function. */
1102 announce_function (tree decl
)
1106 if (rtl_dump_and_exit
)
1107 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl
)));
1109 verbatim (" %s", lang_hooks
.decl_printable_name (decl
, 2));
1111 pp_needs_newline (global_dc
->printer
) = true;
1112 diagnostic_set_last_function (global_dc
);
1116 /* Set up a default flag_random_seed and local_tick, unless the user
1117 already specified one. */
1122 if (!flag_random_seed
)
1124 unsigned HOST_WIDE_INT value
;
1125 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
1127 /* Get some more or less random data. */
1128 #ifdef HAVE_GETTIMEOFDAY
1132 gettimeofday (&tv
, NULL
);
1133 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
1137 time_t now
= time (NULL
);
1139 if (now
!= (time_t)-1)
1140 local_tick
= (unsigned) now
;
1143 value
= local_tick
^ getpid ();
1145 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
1146 flag_random_seed
= random_seed
;
1148 else if (!local_tick
)
1153 /* Decode the string P as an integral parameter.
1154 If the string is indeed an integer return its numeric value else
1155 issue an Invalid Option error for the option PNAME and return DEFVAL.
1156 If PNAME is zero just return DEFVAL, do not call error. */
1159 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
1161 const char *endp
= p
;
1165 if (ISDIGIT (*endp
))
1174 error ("invalid option argument `%s'", pname
);
1181 /* Return the logarithm of X, base 2, considering X unsigned,
1182 if X is a power of 2. Otherwise, returns -1.
1184 This should be used via the `exact_log2' macro. */
1187 exact_log2_wide (unsigned HOST_WIDE_INT x
)
1190 /* Test for 0 or a power of 2. */
1191 if (x
== 0 || x
!= (x
& -x
))
1193 while ((x
>>= 1) != 0)
1198 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1199 If X is 0, return -1.
1201 This should be used via the floor_log2 macro. */
1204 floor_log2_wide (unsigned HOST_WIDE_INT x
)
1213 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1214 into ICE messages, which is much more user friendly. In case the
1215 error printer crashes, reset the signal to prevent infinite recursion. */
1218 crash_signal (int signo
)
1220 signal (signo
, SIG_DFL
);
1221 internal_error ("%s", strsignal (signo
));
1224 /* Arrange to dump core on error. (The regular error message is still
1225 printed first, except in the case of abort().) */
1228 setup_core_dumping (void)
1231 signal (SIGABRT
, SIG_DFL
);
1233 #if defined(HAVE_SETRLIMIT)
1236 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
1237 fatal_error ("getting core file size maximum limit: %m");
1238 rlim
.rlim_cur
= rlim
.rlim_max
;
1239 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
1240 fatal_error ("setting core file size limit to maximum: %m");
1243 diagnostic_abort_on_error (global_dc
);
1247 /* Strip off a legitimate source ending from the input string NAME of
1248 length LEN. Rather than having to know the names used by all of
1249 our front ends, we strip off an ending of a period followed by
1250 up to five characters. (Java uses ".class".) */
1253 strip_off_ending (char *name
, int len
)
1256 for (i
= 2; i
< 6 && len
> i
; i
++)
1258 if (name
[len
- i
] == '.')
1260 name
[len
- i
] = '\0';
1266 /* Output a quoted string. */
1269 output_quoted_string (FILE *asm_file
, const char *string
)
1271 #ifdef OUTPUT_QUOTED_STRING
1272 OUTPUT_QUOTED_STRING (asm_file
, string
);
1276 putc ('\"', asm_file
);
1277 while ((c
= *string
++) != 0)
1281 if (c
== '\"' || c
== '\\')
1282 putc ('\\', asm_file
);
1286 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
1288 putc ('\"', asm_file
);
1292 /* Output a file name in the form wanted by System V. */
1295 output_file_directive (FILE *asm_file
, const char *input_name
)
1300 if (input_name
== NULL
)
1301 input_name
= "<stdin>";
1303 len
= strlen (input_name
);
1304 na
= input_name
+ len
;
1306 /* NA gets INPUT_NAME sans directory names. */
1307 while (na
> input_name
)
1309 if (IS_DIR_SEPARATOR (na
[-1]))
1314 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1315 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
1317 fprintf (asm_file
, "\t.file\t");
1318 output_quoted_string (asm_file
, na
);
1319 fputc ('\n', asm_file
);
1323 /* Do any final processing required for the declarations in VEC, of
1324 which there are LEN. We write out inline functions and variables
1325 that have been deferred until this point, but which are required.
1326 Returns nonzero if anything was put out. */
1329 wrapup_global_declarations (tree
*vec
, int len
)
1334 int output_something
= 0;
1336 for (i
= 0; i
< len
; i
++)
1340 /* We're not deferring this any longer. Assignment is
1341 conditional to avoid needlessly dirtying PCH pages. */
1342 if (DECL_DEFER_OUTPUT (decl
) != 0)
1343 DECL_DEFER_OUTPUT (decl
) = 0;
1345 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
1346 lang_hooks
.finish_incomplete_decl (decl
);
1349 /* Now emit any global variables or functions that we have been
1350 putting off. We need to loop in case one of the things emitted
1351 here references another one which comes earlier in the list. */
1355 for (i
= 0; i
< len
; i
++)
1359 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
1362 /* Don't write out static consts, unless we still need them.
1364 We also keep static consts if not optimizing (for debugging),
1365 unless the user specified -fno-keep-static-consts.
1366 ??? They might be better written into the debug information.
1367 This is possible when using DWARF.
1369 A language processor that wants static constants to be always
1370 written out (even if it is not used) is responsible for
1371 calling rest_of_decl_compilation itself. E.g. the C front-end
1372 calls rest_of_decl_compilation from finish_decl.
1373 One motivation for this is that is conventional in some
1374 environments to write things like:
1375 static const char rcsid[] = "... version string ...";
1376 intending to force the string to be in the executable.
1378 A language processor that would prefer to have unneeded
1379 static constants "optimized away" would just defer writing
1380 them out until here. E.g. C++ does this, because static
1381 constants are often defined in header files.
1383 ??? A tempting alternative (for both C and C++) would be
1384 to force a constant to be written if and only if it is
1385 defined in a main file, as opposed to an include file. */
1387 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
1391 if (flag_unit_at_a_time
1392 && cgraph_varpool_node (decl
)->finalized
)
1394 else if ((flag_unit_at_a_time
&& !cgraph_global_info_ready
)
1395 && (TREE_USED (decl
)
1396 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
1398 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1400 else if (DECL_COMDAT (decl
))
1402 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
1403 && (optimize
|| !flag_keep_static_consts
1404 || DECL_ARTIFICIAL (decl
)))
1410 rest_of_decl_compilation (decl
, NULL
, 1, 1);
1414 if (TREE_CODE (decl
) == FUNCTION_DECL
1415 && DECL_INITIAL (decl
) != 0
1416 && DECL_STRUCT_FUNCTION (decl
) != 0
1417 && DECL_STRUCT_FUNCTION (decl
)->saved_for_inline
1418 && (flag_keep_inline_functions
1419 || (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1420 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
1423 output_inline_function (decl
);
1428 output_something
= 1;
1432 return output_something
;
1435 /* Issue appropriate warnings for the global declarations in VEC (of
1436 which there are LEN). Output debugging information for them. */
1439 check_global_declarations (tree
*vec
, int len
)
1444 for (i
= 0; i
< len
; i
++)
1448 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
)
1449 && ! TREE_ASM_WRITTEN (decl
))
1450 /* Cancel the RTL for this decl so that, if debugging info
1451 output for global variables is still to come,
1452 this one will be omitted. */
1453 SET_DECL_RTL (decl
, NULL_RTX
);
1455 /* Warn about any function
1456 declared static but not defined.
1457 We don't warn about variables,
1458 because many programs have static variables
1459 that exist only to get some text into the object file. */
1460 if (TREE_CODE (decl
) == FUNCTION_DECL
1461 && (warn_unused_function
1462 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1463 && DECL_INITIAL (decl
) == 0
1464 && DECL_EXTERNAL (decl
)
1465 && ! DECL_ARTIFICIAL (decl
)
1466 && ! TREE_PUBLIC (decl
))
1468 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
1469 pedwarn ("%J'%F' used but never defined", decl
, decl
);
1471 warning ("%J'%F' declared `static' but never defined", decl
, decl
);
1472 /* This symbol is effectively an "extern" declaration now. */
1473 TREE_PUBLIC (decl
) = 1;
1474 assemble_external (decl
);
1477 /* Warn about static fns or vars defined but not used. */
1478 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
1479 /* We don't warn about "static const" variables because the
1480 "rcs_id" idiom uses that construction. */
1481 || (warn_unused_variable
1482 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
1483 && ! DECL_IN_SYSTEM_HEADER (decl
)
1484 && ! TREE_USED (decl
)
1485 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1486 to handle multiple external decls in different scopes. */
1487 && ! TREE_USED (DECL_NAME (decl
))
1488 && ! DECL_EXTERNAL (decl
)
1489 && ! TREE_PUBLIC (decl
)
1490 /* A volatile variable might be used in some non-obvious way. */
1491 && ! TREE_THIS_VOLATILE (decl
)
1492 /* Global register variables must be declared to reserve them. */
1493 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
1494 /* Otherwise, ask the language. */
1495 && lang_hooks
.decls
.warn_unused_global (decl
))
1496 warning ("%J'%D' defined but not used", decl
, decl
);
1498 /* Avoid confusing the debug information machinery when there are
1500 if (errorcount
== 0 && sorrycount
== 0)
1502 timevar_push (TV_SYMOUT
);
1503 (*debug_hooks
->global_decl
) (decl
);
1504 timevar_pop (TV_SYMOUT
);
1509 /* Warn about a use of an identifier which was marked deprecated. */
1511 warn_deprecated_use (tree node
)
1513 if (node
== 0 || !warn_deprecated_decl
)
1517 warning ("`%s' is deprecated (declared at %s:%d)",
1518 IDENTIFIER_POINTER (DECL_NAME (node
)),
1519 DECL_SOURCE_FILE (node
), DECL_SOURCE_LINE (node
));
1520 else if (TYPE_P (node
))
1522 const char *what
= NULL
;
1523 tree decl
= TYPE_STUB_DECL (node
);
1525 if (TREE_CODE (TYPE_NAME (node
)) == IDENTIFIER_NODE
)
1526 what
= IDENTIFIER_POINTER (TYPE_NAME (node
));
1527 else if (TREE_CODE (TYPE_NAME (node
)) == TYPE_DECL
1528 && DECL_NAME (TYPE_NAME (node
)))
1529 what
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node
)));
1534 warning ("`%s' is deprecated (declared at %s:%d)", what
,
1535 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1537 warning ("`%s' is deprecated", what
);
1540 warning ("type is deprecated (declared at %s:%d)",
1541 DECL_SOURCE_FILE (decl
), DECL_SOURCE_LINE (decl
));
1543 warning ("type is deprecated");
1547 /* Save the current INPUT_LOCATION on the top entry in the
1548 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1549 INPUT_LOCATION accordingly. */
1552 push_srcloc (const char *file
, int line
)
1554 struct file_stack
*fs
;
1556 fs
= xmalloc (sizeof (struct file_stack
));
1557 fs
->location
= input_location
;
1558 fs
->next
= input_file_stack
;
1559 input_filename
= file
;
1561 input_file_stack
= fs
;
1562 input_file_stack_tick
++;
1565 /* Pop the top entry off the stack of presently open source files.
1566 Restore the INPUT_LOCATION from the new topmost entry on the
1572 struct file_stack
*fs
;
1574 fs
= input_file_stack
;
1575 input_location
= fs
->location
;
1576 input_file_stack
= fs
->next
;
1578 input_file_stack_tick
++;
1581 /* Compile an entire translation unit. Write a file of assembly
1582 output and various debugging dumps. */
1587 /* Initialize yet another pass. */
1589 init_final (main_input_filename
);
1590 coverage_init (aux_base_name
);
1592 timevar_push (TV_PARSE
);
1594 /* Call the parser, which parses the entire file (calling
1595 rest_of_compilation for each function). */
1596 lang_hooks
.parse_file (set_yydebug
);
1598 /* In case there were missing block closers,
1599 get us back to the global binding level. */
1600 lang_hooks
.clear_binding_stack ();
1602 /* Compilation is now finished except for writing
1603 what's left of the symbol table output. */
1604 timevar_pop (TV_PARSE
);
1606 if (flag_syntax_only
)
1609 lang_hooks
.decls
.final_write_globals ();
1611 cgraph_varpool_assemble_pending_decls ();
1613 /* This must occur after the loop to output deferred functions.
1614 Else the coverage initializer would not be emitted if all the
1615 functions in this compilation unit were deferred. */
1618 /* Write out any pending weak symbol declarations. */
1622 /* Do dbx symbols. */
1623 timevar_push (TV_SYMOUT
);
1625 #ifdef DWARF2_UNWIND_INFO
1626 if (dwarf2out_do_frame ())
1627 dwarf2out_frame_finish ();
1630 (*debug_hooks
->finish
) (main_input_filename
);
1631 timevar_pop (TV_SYMOUT
);
1633 /* Output some stuff at end of file if nec. */
1635 dw2_output_indirect_constants ();
1637 /* Attach a special .ident directive to the end of the file to identify
1638 the version of GCC which compiled this code. The format of the .ident
1639 string is patterned after the ones produced by native SVR4 compilers. */
1642 fprintf (asm_out_file
, "%s\"GCC: (GNU) %s\"\n",
1643 IDENT_ASM_OP
, version_string
);
1646 /* This must be at the end. Some target ports emit end of file directives
1647 into the assembly file here, and hence we can not output anything to the
1648 assembly file after this point. */
1649 targetm
.asm_out
.file_end ();
1652 /* Display help for target options. */
1654 display_target_options (void)
1657 static bool displayed
= false;
1659 /* Avoid double printing for --help --target-help. */
1665 if (ARRAY_SIZE (target_switches
) > 1
1666 #ifdef TARGET_OPTIONS
1667 || ARRAY_SIZE (target_options
) > 1
1675 printf (_("\nTarget specific options:\n"));
1677 for (i
= ARRAY_SIZE (target_switches
); i
--;)
1679 const char *option
= target_switches
[i
].name
;
1680 const char *description
= target_switches
[i
].description
;
1682 if (option
== NULL
|| *option
== 0)
1684 else if (description
== NULL
)
1689 printf (_(" -m%-23s [undocumented]\n"), option
);
1691 else if (*description
!= 0)
1692 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
1695 #ifdef TARGET_OPTIONS
1696 for (i
= ARRAY_SIZE (target_options
); i
--;)
1698 const char *option
= target_options
[i
].prefix
;
1699 const char *description
= target_options
[i
].description
;
1701 if (option
== NULL
|| *option
== 0)
1703 else if (description
== NULL
)
1708 printf (_(" -m%-23s [undocumented]\n"), option
);
1710 else if (*description
!= 0)
1711 doc
+= printf (" -m%-23s %s\n", option
, _(description
));
1717 printf (_("\nThere are undocumented target specific options as well.\n"));
1719 printf (_(" They exist, but they are not documented.\n"));
1724 /* Parse a -d... command line switch. */
1727 decode_d_option (const char *arg
)
1738 flag_print_asm_name
= 1;
1741 flag_dump_rtl_in_asm
= 1;
1742 flag_print_asm_name
= 1;
1745 graph_dump_format
= vcg
;
1748 rtl_dump_and_exit
= 1;
1753 case 'D': /* These are handled by the preprocessor. */
1757 setup_core_dumping();
1762 if (!enable_rtl_dump_file (c
))
1763 warning ("unrecognized gcc debugging option: %c", c
);
1768 /* Indexed by enum debug_info_type. */
1769 const char *const debug_type_names
[] =
1771 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1774 /* Decode -m switches. */
1775 /* Decode the switch -mNAME. */
1778 set_target_switch (const char *name
)
1781 int valid_target_option
= 0;
1783 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
1784 if (!strcmp (target_switches
[j
].name
, name
))
1786 if (target_switches
[j
].value
< 0)
1787 target_flags
&= ~-target_switches
[j
].value
;
1789 target_flags
|= target_switches
[j
].value
;
1792 if (target_switches
[j
].value
< 0)
1793 target_flags_explicit
|= -target_switches
[j
].value
;
1795 target_flags_explicit
|= target_switches
[j
].value
;
1797 valid_target_option
= 1;
1800 #ifdef TARGET_OPTIONS
1801 if (!valid_target_option
)
1802 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
1804 int len
= strlen (target_options
[j
].prefix
);
1805 if (target_options
[j
].value
)
1807 if (!strcmp (target_options
[j
].prefix
, name
))
1809 *target_options
[j
].variable
= target_options
[j
].value
;
1810 valid_target_option
= 1;
1815 if (!strncmp (target_options
[j
].prefix
, name
, len
))
1817 *target_options
[j
].variable
= name
+ len
;
1818 valid_target_option
= 1;
1824 if (!valid_target_option
)
1825 error ("invalid option `%s'", name
);
1828 /* Print version information to FILE.
1829 Each line begins with INDENT (for the case where FILE is the
1830 assembler output file). */
1833 print_version (FILE *file
, const char *indent
)
1836 #define __VERSION__ "[?]"
1840 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1842 "%s%s%s version %s (%s) compiled by CC.\n"
1844 , indent
, *indent
!= 0 ? " " : "",
1845 lang_hooks
.name
, version_string
, TARGET_NAME
,
1846 indent
, __VERSION__
);
1847 fnotice (file
, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1848 indent
, *indent
!= 0 ? " " : "",
1849 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
1852 /* Print an option value and return the adjusted position in the line.
1853 ??? We don't handle error returns from fprintf (disk full); presumably
1854 other code will catch a disk full though. */
1857 print_single_switch (FILE *file
, int pos
, int max
,
1858 const char *indent
, const char *sep
, const char *term
,
1859 const char *type
, const char *name
)
1861 /* The ultrix fprintf returns 0 on success, so compute the result we want
1862 here since we need it for the following test. */
1863 int len
= strlen (sep
) + strlen (type
) + strlen (name
);
1868 fprintf (file
, "%s", term
);
1873 fprintf (file
, "%s", indent
);
1874 pos
= strlen (indent
);
1876 fprintf (file
, "%s%s%s", sep
, type
, name
);
1881 /* Print active target switches to FILE.
1882 POS is the current cursor position and MAX is the size of a "line".
1883 Each line begins with INDENT and ends with TERM.
1884 Each switch is separated from the next by SEP. */
1887 print_switch_values (FILE *file
, int pos
, int max
,
1888 const char *indent
, const char *sep
, const char *term
)
1893 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1894 that it can be printed below. This helps reproducibility. */
1897 /* Print the options as passed. */
1898 pos
= print_single_switch (file
, pos
, max
, indent
, *indent
? " " : "", term
,
1899 _("options passed: "), "");
1901 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
1905 if (strcmp (*p
, "-o") == 0)
1911 if (strcmp (*p
, "-quiet") == 0)
1913 if (strcmp (*p
, "-version") == 0)
1918 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
, *p
, "");
1921 fprintf (file
, "%s", term
);
1923 /* Print the -f and -m options that have been enabled.
1924 We don't handle language specific options but printing argv
1927 pos
= print_single_switch (file
, 0, max
, indent
, *indent
? " " : "", term
,
1928 _("options enabled: "), "");
1930 for (j
= 0; j
< ARRAY_SIZE (f_options
); j
++)
1931 if (*f_options
[j
].variable
== f_options
[j
].on_value
)
1932 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
1933 "-f", f_options
[j
].string
);
1935 /* Print target specific options. */
1937 for (j
= 0; j
< ARRAY_SIZE (target_switches
); j
++)
1938 if (target_switches
[j
].name
[0] != '\0'
1939 && target_switches
[j
].value
> 0
1940 && ((target_switches
[j
].value
& target_flags
)
1941 == target_switches
[j
].value
))
1943 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
1944 "-m", target_switches
[j
].name
);
1947 #ifdef TARGET_OPTIONS
1948 for (j
= 0; j
< ARRAY_SIZE (target_options
); j
++)
1949 if (*target_options
[j
].variable
!= NULL
)
1952 sprintf (prefix
, "-m%s", target_options
[j
].prefix
);
1953 pos
= print_single_switch (file
, pos
, max
, indent
, sep
, term
,
1954 prefix
, *target_options
[j
].variable
);
1958 fprintf (file
, "%s", term
);
1961 /* Open assembly code output file. Do this even if -fsyntax-only is
1962 on, because then the driver will have provided the name of a
1963 temporary file or bit bucket for us. NAME is the file specified on
1964 the command line, possibly NULL. */
1966 init_asm_output (const char *name
)
1968 if (name
== NULL
&& asm_file_name
== 0)
1969 asm_out_file
= stdout
;
1972 if (asm_file_name
== 0)
1974 int len
= strlen (dump_base_name
);
1975 char *dumpname
= xmalloc (len
+ 6);
1976 memcpy (dumpname
, dump_base_name
, len
+ 1);
1977 strip_off_ending (dumpname
, len
);
1978 strcat (dumpname
, ".s");
1979 asm_file_name
= dumpname
;
1981 if (!strcmp (asm_file_name
, "-"))
1982 asm_out_file
= stdout
;
1984 asm_out_file
= fopen (asm_file_name
, "w+");
1985 if (asm_out_file
== 0)
1986 fatal_error ("can't open %s for writing: %m", asm_file_name
);
1989 #ifdef IO_BUFFER_SIZE
1990 setvbuf (asm_out_file
, xmalloc (IO_BUFFER_SIZE
),
1991 _IOFBF
, IO_BUFFER_SIZE
);
1994 if (!flag_syntax_only
)
1996 targetm
.asm_out
.file_start ();
1998 #ifdef ASM_COMMENT_START
1999 if (flag_verbose_asm
)
2001 /* Print the list of options in effect. */
2002 print_version (asm_out_file
, ASM_COMMENT_START
);
2003 print_switch_values (asm_out_file
, 0, MAX_LINE
,
2004 ASM_COMMENT_START
, " ", "\n");
2005 /* Add a blank line here so it appears in assembler output but not
2007 fprintf (asm_out_file
, "\n");
2013 /* Default version of get_pch_validity.
2014 By default, every flag difference is fatal; that will be mostly right for
2015 most targets, but completely right for very few. */
2018 default_get_pch_validity (size_t *len
)
2020 #ifdef TARGET_OPTIONS
2025 *len
= sizeof (target_flags
) + 2;
2026 #ifdef TARGET_OPTIONS
2027 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
2030 if (*target_options
[i
].variable
)
2031 *len
+= strlen (*target_options
[i
].variable
);
2035 result
= r
= xmalloc (*len
);
2039 memcpy (r
, &target_flags
, sizeof (target_flags
));
2040 r
+= sizeof (target_flags
);
2042 #ifdef TARGET_OPTIONS
2043 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
2045 const char *str
= *target_options
[i
].variable
;
2049 l
= strlen (str
) + 1;
2058 /* Default version of pch_valid_p. */
2061 default_pch_valid_p (const void *data_p
, size_t len
)
2063 const char *data
= (const char *)data_p
;
2064 const char *flag_that_differs
= NULL
;
2067 /* -fpic and -fpie also usually make a PCH invalid. */
2068 if (data
[0] != flag_pic
)
2069 return _("created and used with different settings of -fpic");
2070 if (data
[1] != flag_pie
)
2071 return _("created and used with different settings of -fpie");
2074 /* Check target_flags. */
2075 if (memcmp (data
, &target_flags
, sizeof (target_flags
)) != 0)
2077 for (i
= 0; i
< ARRAY_SIZE (target_switches
); i
++)
2082 memcpy (&tf
, data
, sizeof (target_flags
));
2084 bits
= target_switches
[i
].value
;
2087 if ((target_flags
& bits
) != (tf
& bits
))
2089 flag_that_differs
= target_switches
[i
].name
;
2095 data
+= sizeof (target_flags
);
2096 len
-= sizeof (target_flags
);
2098 /* Check string options. */
2099 #ifdef TARGET_OPTIONS
2100 for (i
= 0; i
< ARRAY_SIZE (target_options
); i
++)
2102 const char *str
= *target_options
[i
].variable
;
2106 l
= strlen (str
) + 1;
2107 if (len
< l
|| memcmp (data
, str
, l
) != 0)
2109 flag_that_differs
= target_options
[i
].prefix
;
2122 asprintf (&r
, _("created and used with differing settings of `-m%s'"),
2125 return _("out of memory");
2130 /* Default tree printer. Handles declarations only. */
2132 default_tree_printer (pretty_printer
* pp
, text_info
*text
)
2134 switch (*text
->format_spec
)
2140 tree t
= va_arg (*text
->args_ptr
, tree
);
2141 const char *n
= DECL_NAME (t
)
2142 ? lang_hooks
.decl_printable_name (t
, 2)
2153 /* Initialization of the front end environment, before command line
2154 options are parsed. Signal handlers, internationalization etc.
2155 ARGV0 is main's argv[0]. */
2157 general_init (const char *argv0
)
2161 p
= argv0
+ strlen (argv0
);
2162 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
2166 xmalloc_set_program_name (progname
);
2170 gcc_init_libintl ();
2172 /* Initialize the diagnostics reporting machinery, so option parsing
2173 can give warnings and errors. */
2174 diagnostic_initialize (global_dc
);
2175 /* Set a default printer. Language specific initializations will
2176 override it later. */
2177 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
2179 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
2181 signal (SIGSEGV
, crash_signal
);
2184 signal (SIGILL
, crash_signal
);
2187 signal (SIGBUS
, crash_signal
);
2190 signal (SIGABRT
, crash_signal
);
2192 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
2193 signal (SIGIOT
, crash_signal
);
2196 signal (SIGFPE
, crash_signal
);
2199 /* Other host-specific signal setup. */
2200 (*host_hooks
.extra_signals
)();
2202 /* Initialize the garbage-collector, string pools and tree type hash
2206 linemap_init (&line_table
);
2209 /* Initialize register usage now so switches may override. */
2212 /* Register the language-independent parameters. */
2213 add_params (lang_independent_params
, LAST_PARAM
);
2215 /* This must be done after add_params but before argument processing. */
2216 init_ggc_heuristics();
2219 /* Process the options that have been parsed. */
2221 process_options (void)
2223 /* Allow the front end to perform consistency checks and do further
2224 initialization based on the command line options. This hook also
2225 sets the original filename if appropriate (e.g. foo.i -> foo.c)
2226 so we can correctly initialize debug output. */
2227 no_backend
= lang_hooks
.post_options (&main_input_filename
);
2228 input_filename
= main_input_filename
;
2230 #ifdef OVERRIDE_OPTIONS
2231 /* Some machines may reject certain combinations of options. */
2235 /* Set aux_base_name if not already set. */
2238 else if (main_input_filename
)
2240 char *name
= xstrdup (lbasename (main_input_filename
));
2242 strip_off_ending (name
, strlen (name
));
2243 aux_base_name
= name
;
2246 aux_base_name
= "gccaux";
2248 /* Set up the align_*_log variables, defaulting them to 1 if they
2249 were still unset. */
2250 if (align_loops
<= 0) align_loops
= 1;
2251 if (align_loops_max_skip
> align_loops
|| !align_loops
)
2252 align_loops_max_skip
= align_loops
- 1;
2253 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
2254 if (align_jumps
<= 0) align_jumps
= 1;
2255 if (align_jumps_max_skip
> align_jumps
|| !align_jumps
)
2256 align_jumps_max_skip
= align_jumps
- 1;
2257 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
2258 if (align_labels
<= 0) align_labels
= 1;
2259 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
2260 if (align_labels_max_skip
> align_labels
|| !align_labels
)
2261 align_labels_max_skip
= align_labels
- 1;
2262 if (align_functions
<= 0) align_functions
= 1;
2263 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
2265 /* Unrolling all loops implies that standard loop unrolling must also
2267 if (flag_unroll_all_loops
)
2268 flag_unroll_loops
= 1;
2270 if (flag_unroll_loops
)
2272 flag_old_unroll_loops
= 0;
2273 flag_old_unroll_all_loops
= 0;
2276 if (flag_old_unroll_all_loops
)
2277 flag_old_unroll_loops
= 1;
2279 /* Old loop unrolling requires that strength_reduction be on also. Silently
2280 turn on strength reduction here if it isn't already on. Also, the loop
2281 unrolling code assumes that cse will be run after loop, so that must
2282 be turned on also. */
2283 if (flag_old_unroll_loops
)
2285 flag_strength_reduce
= 1;
2286 flag_rerun_cse_after_loop
= 1;
2288 if (flag_unroll_loops
|| flag_peel_loops
)
2289 flag_rerun_cse_after_loop
= 1;
2291 if (flag_non_call_exceptions
)
2292 flag_asynchronous_unwind_tables
= 1;
2293 if (flag_asynchronous_unwind_tables
)
2294 flag_unwind_tables
= 1;
2296 /* Disable unit-at-a-time mode for frontends not supporting callgraph
2298 if (flag_unit_at_a_time
&& ! lang_hooks
.callgraph
.expand_function
)
2299 flag_unit_at_a_time
= 0;
2301 if (flag_value_profile_transformations
)
2302 flag_profile_values
= 1;
2304 /* Warn about options that are not supported on this machine. */
2305 #ifndef INSN_SCHEDULING
2306 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
2307 warning ("instruction scheduling not supported on this target machine");
2310 if (flag_delayed_branch
)
2311 warning ("this target machine does not have delayed branches");
2314 user_label_prefix
= USER_LABEL_PREFIX
;
2315 if (flag_leading_underscore
!= -1)
2317 /* If the default prefix is more complicated than "" or "_",
2318 issue a warning and ignore this option. */
2319 if (user_label_prefix
[0] == 0 ||
2320 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
2322 user_label_prefix
= flag_leading_underscore
? "_" : "";
2325 warning ("-f%sleading-underscore not supported on this target machine",
2326 flag_leading_underscore
? "" : "no-");
2329 /* If we are in verbose mode, write out the version and maybe all the
2330 option flags in use. */
2333 print_version (stderr
, "");
2335 print_switch_values (stderr
, 0, MAX_LINE
, "", " ", "\n");
2338 if (flag_syntax_only
)
2340 write_symbols
= NO_DEBUG
;
2344 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
2346 if (debug_info_level
== DINFO_LEVEL_NONE
)
2347 write_symbols
= NO_DEBUG
;
2349 /* Now we know write_symbols, set up the debug hooks based on it.
2350 By default we do nothing for debug output. */
2351 if (PREFERRED_DEBUGGING_TYPE
== NO_DEBUG
)
2352 default_debug_hooks
= &do_nothing_debug_hooks
;
2353 #if defined(DBX_DEBUGGING_INFO)
2354 else if (PREFERRED_DEBUGGING_TYPE
== DBX_DEBUG
)
2355 default_debug_hooks
= &dbx_debug_hooks
;
2357 #if defined(XCOFF_DEBUGGING_INFO)
2358 else if (PREFERRED_DEBUGGING_TYPE
== XCOFF_DEBUG
)
2359 default_debug_hooks
= &xcoff_debug_hooks
;
2361 #ifdef SDB_DEBUGGING_INFO
2362 else if (PREFERRED_DEBUGGING_TYPE
== SDB_DEBUG
)
2363 default_debug_hooks
= &sdb_debug_hooks
;
2365 #ifdef DWARF2_DEBUGGING_INFO
2366 else if (PREFERRED_DEBUGGING_TYPE
== DWARF2_DEBUG
)
2367 default_debug_hooks
= &dwarf2_debug_hooks
;
2369 #ifdef VMS_DEBUGGING_INFO
2370 else if (PREFERRED_DEBUGGING_TYPE
== VMS_DEBUG
2371 || PREFERRED_DEBUGGING_TYPE
== VMS_AND_DWARF2_DEBUG
)
2372 default_debug_hooks
= &vmsdbg_debug_hooks
;
2375 if (write_symbols
== NO_DEBUG
)
2376 debug_hooks
= &do_nothing_debug_hooks
;
2377 #if defined(DBX_DEBUGGING_INFO)
2378 else if (write_symbols
== DBX_DEBUG
)
2379 debug_hooks
= &dbx_debug_hooks
;
2381 #if defined(XCOFF_DEBUGGING_INFO)
2382 else if (write_symbols
== XCOFF_DEBUG
)
2383 debug_hooks
= &xcoff_debug_hooks
;
2385 #ifdef SDB_DEBUGGING_INFO
2386 else if (write_symbols
== SDB_DEBUG
)
2387 debug_hooks
= &sdb_debug_hooks
;
2389 #ifdef DWARF2_DEBUGGING_INFO
2390 else if (write_symbols
== DWARF2_DEBUG
)
2391 debug_hooks
= &dwarf2_debug_hooks
;
2393 #ifdef VMS_DEBUGGING_INFO
2394 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
2395 debug_hooks
= &vmsdbg_debug_hooks
;
2398 error ("target system does not support the \"%s\" debug format",
2399 debug_type_names
[write_symbols
]);
2401 /* Now we know which debug output will be used so we can set
2402 flag_var_tracking, flag_rename_registers and flag_web if the user has
2403 not specified them. */
2404 if (debug_info_level
< DINFO_LEVEL_NORMAL
2405 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
2407 if (flag_var_tracking
== 1)
2409 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
2410 warning ("variable tracking requested, but useless unless "
2411 "producing debug info");
2413 warning ("variable tracking requested, but not supported "
2414 "by this debug format");
2416 flag_var_tracking
= 0;
2419 if (flag_rename_registers
== AUTODETECT_FLAG_VAR_TRACKING
)
2420 flag_rename_registers
= default_debug_hooks
->var_location
2421 != do_nothing_debug_hooks
.var_location
;
2423 if (flag_web
== AUTODETECT_FLAG_VAR_TRACKING
)
2424 flag_web
= optimize
>= 2 && (default_debug_hooks
->var_location
2425 != do_nothing_debug_hooks
.var_location
);
2427 if (flag_var_tracking
== AUTODETECT_FLAG_VAR_TRACKING
)
2428 flag_var_tracking
= optimize
>= 1;
2430 /* If auxiliary info generation is desired, open the output file.
2431 This goes in the same directory as the source file--unlike
2432 all the other output files. */
2433 if (flag_gen_aux_info
)
2435 aux_info_file
= fopen (aux_info_file_name
, "w");
2436 if (aux_info_file
== 0)
2437 fatal_error ("can't open %s: %m", aux_info_file_name
);
2440 if (! targetm
.have_named_sections
)
2442 if (flag_function_sections
)
2444 warning ("-ffunction-sections not supported for this target");
2445 flag_function_sections
= 0;
2447 if (flag_data_sections
)
2449 warning ("-fdata-sections not supported for this target");
2450 flag_data_sections
= 0;
2454 if (flag_function_sections
&& profile_flag
)
2456 warning ("-ffunction-sections disabled; it makes profiling impossible");
2457 flag_function_sections
= 0;
2460 #ifndef HAVE_prefetch
2461 if (flag_prefetch_loop_arrays
)
2463 warning ("-fprefetch-loop-arrays not supported for this target");
2464 flag_prefetch_loop_arrays
= 0;
2467 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
2469 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
2470 flag_prefetch_loop_arrays
= 0;
2474 /* This combination of options isn't handled for i386 targets and doesn't
2475 make much sense anyway, so don't allow it. */
2476 if (flag_prefetch_loop_arrays
&& optimize_size
)
2478 warning ("-fprefetch-loop-arrays is not supported with -Os");
2479 flag_prefetch_loop_arrays
= 0;
2482 #ifndef OBJECT_FORMAT_ELF
2483 if (flag_function_sections
&& write_symbols
!= NO_DEBUG
)
2484 warning ("-ffunction-sections may affect debugging on some targets");
2487 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2488 if (flag_signaling_nans
)
2489 flag_trapping_math
= 1;
2492 /* Initialize the compiler back end. */
2496 init_adjust_machine_modes ();
2498 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2499 || debug_info_level
== DINFO_LEVEL_VERBOSE
2500 #ifdef VMS_DEBUGGING_INFO
2501 /* Enable line number info for traceback. */
2502 || debug_info_level
> DINFO_LEVEL_NONE
2504 || flag_test_coverage
2505 || warn_notreached
);
2508 init_fake_stack_mems ();
2512 init_function_once ();
2513 init_varasm_once ();
2515 /* The following initialization functions need to generate rtl, so
2516 provide a dummy function context for them. */
2517 init_dummy_function_start ();
2519 if (flag_caller_saves
)
2520 init_caller_save ();
2521 expand_dummy_function_end ();
2524 /* Language-dependent initialization. Returns nonzero on success. */
2526 lang_dependent_init (const char *name
)
2528 if (dump_base_name
== 0)
2529 dump_base_name
= name
? name
: "gccdump";
2531 /* Other front-end initialization. */
2532 if (lang_hooks
.init () == 0)
2535 init_asm_output (name
);
2537 /* These create various _DECL nodes, so need to be called after the
2538 front end is initialized. */
2541 init_optimization_passes ();
2543 /* The following initialization functions need to generate rtl, so
2544 provide a dummy function context for them. */
2545 init_dummy_function_start ();
2547 expand_dummy_function_end ();
2549 /* If dbx symbol table desired, initialize writing it and output the
2550 predefined types. */
2551 timevar_push (TV_SYMOUT
);
2553 #ifdef DWARF2_UNWIND_INFO
2554 if (dwarf2out_do_frame ())
2555 dwarf2out_frame_init ();
2558 /* Now we have the correct original filename, we can initialize
2560 (*debug_hooks
->init
) (name
);
2562 timevar_pop (TV_SYMOUT
);
2567 /* Clean up: close opened files, etc. */
2572 /* Close the dump files. */
2573 if (flag_gen_aux_info
)
2575 fclose (aux_info_file
);
2577 unlink (aux_info_file_name
);
2580 /* Close non-debugging input and output files. Take special care to note
2581 whether fclose returns an error, since the pages might still be on the
2582 buffer chain while the file is open. */
2586 if (ferror (asm_out_file
) != 0)
2587 fatal_error ("error writing to %s: %m", asm_file_name
);
2588 if (fclose (asm_out_file
) != 0)
2589 fatal_error ("error closing %s: %m", asm_file_name
);
2592 finish_optimization_passes ();
2596 ggc_print_statistics ();
2597 stringpool_statistics ();
2598 dump_tree_statistics ();
2599 dump_rtx_statistics ();
2600 dump_varray_statistics ();
2601 dump_alloc_pool_statistics ();
2602 dump_ggc_loc_statistics ();
2605 /* Free up memory for the benefit of leak detectors. */
2608 /* Language-specific end of compilation actions. */
2609 lang_hooks
.finish ();
2612 /* Initialize the compiler, and compile the input file. */
2616 /* Initialize timing first. The C front ends read the main file in
2617 the post_options hook, and C++ does file timings. */
2618 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
2620 timevar_start (TV_TOTAL
);
2624 /* Don't do any more if an error has already occurred. */
2627 /* Set up the back-end if requested. */
2631 /* Language-dependent initialization. Returns true on success. */
2632 if (lang_dependent_init (main_input_filename
))
2638 /* Stop timing and print the times. */
2639 timevar_stop (TV_TOTAL
);
2640 timevar_print (stderr
);
2643 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2644 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2645 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2647 It is not safe to call this function more than once. */
2650 toplev_main (unsigned int argc
, const char **argv
)
2654 /* Initialization of GCC's environment, and diagnostics. */
2655 general_init (argv
[0]);
2657 /* Parse the options and do minimal processing; basically just
2658 enough to default flags appropriately. */
2659 decode_options (argc
, argv
);
2663 /* Exit early if we can (e.g. -help). */
2664 if (!exit_after_options
)
2667 if (errorcount
|| sorrycount
)
2668 return (FATAL_EXIT_CODE
);
2670 return (SUCCESS_EXIT_CODE
);