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"
76 #include "tree-alias-common.h"
78 #include "hosthooks.h"
82 #include "value-prof.h"
83 #include "alloc-pool.h"
85 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
86 #include "dwarf2out.h"
89 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
93 #ifdef SDB_DEBUGGING_INFO
97 #ifdef XCOFF_DEBUGGING_INFO
98 #include "xcoffout.h" /* Needed for external data
99 declarations for e.g. AIX 4.x. */
102 static void general_init (const char *);
103 static void do_compile (void);
104 static void process_options (void);
105 static void backend_init (void);
106 static int lang_dependent_init (const char *);
107 static void init_asm_output (const char *);
108 static void finalize (void);
110 static void crash_signal (int) ATTRIBUTE_NORETURN;
111 static void setup_core_dumping (void);
112 static void compile_file (void);
114 static int print_single_switch (FILE *, int, int, const char *,
115 const char *, const char *,
116 const char *, const char *);
117 static void print_switch_values (FILE *, int, int, const char *,
118 const char *, const char *);
120 /* Nonzero to dump debug info whilst parsing (-dy option). */
121 static int set_yydebug;
123 /* True if we don't need a backend (e.g. preprocessing only). */
124 static bool no_backend;
126 /* Length of line when printing switch values. */
129 /* Name of program invoked, sans directories. */
131 const char *progname;
133 /* Copy of argument vector to toplev_main. */
134 static const char **save_argv;
136 /* Name of top-level original source file (what was input to cpp).
137 This comes from the #-command at the beginning of the actual input.
138 If there isn't any there, then this is the cc1 input file name. */
140 const char *main_input_filename;
142 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
143 to optimize and default_debug_hooks in process_options (). */
144 #define AUTODETECT_FLAG_VAR_TRACKING 2
146 /* Current position in real source file. */
148 location_t input_location;
150 struct line_maps line_table;
152 /* Nonzero if it is unsafe to create any new pseudo registers. */
155 /* Stack of currently pending input files. */
157 struct file_stack *input_file_stack;
159 /* Incremented on each change to input_file_stack. */
160 int input_file_stack_tick;
162 /* Name to use as base of names for dump output files. */
164 const char *dump_base_name;
166 /* Name to use as a base for auxiliary output files. */
168 const char *aux_base_name;
170 /* Bit flags that specify the machine subtype we are compiling for.
171 Bits are tested using macros TARGET_... defined in the tm.h file
172 and set by `-m...' switches. Must be defined in rtlanal.c. */
174 extern int target_flags;
176 /* A mask of target_flags that includes bit X if X was set or cleared
177 on the command line. */
179 int target_flags_explicit;
181 /* Debug hooks - dependent upon command line options. */
183 const struct gcc_debug_hooks *debug_hooks;
185 /* Debug hooks - target default. */
187 static const struct gcc_debug_hooks *default_debug_hooks;
189 /* Other flags saying which kinds of debugging dump have been requested. */
191 int rtl_dump_and_exit;
192 int flag_print_asm_name;
193 enum graph_dump_types graph_dump_format;
195 /* Name for output file of assembly code, specified with -o. */
197 const char *asm_file_name;
199 /* Nonzero means do optimizations. -O.
200 Particular numeric values stand for particular amounts of optimization;
201 thus, -O2 stores 2 here. However, the optimizations beyond the basic
202 ones are not controlled directly by this variable. Instead, they are
203 controlled by individual `flag_...' variables that are defaulted
204 based on this variable. */
208 /* Nonzero means optimize for size. -Os.
209 The only valid values are zero and nonzero. When optimize_size is
210 nonzero, optimize defaults to 2, but certain individual code
211 bloating optimizations are disabled. */
213 int optimize_size = 0;
215 /* The FUNCTION_DECL for the function currently being compiled,
216 or 0 if between functions. */
217 tree current_function_decl;
219 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
221 tree current_function_func_begin_label;
223 /* A DECL for the current file-scope context. When using IMA, this heads a
224 chain of FILE_DECLs; currently only C uses it. */
226 tree current_file_decl;
228 /* Nonzero if doing dwarf2 duplicate elimination. */
230 int flag_eliminate_dwarf2_dups = 0;
232 /* Nonzero if doing unused type elimination. */
234 int flag_eliminate_unused_debug_types = 1;
236 /* Nonzero means emit debugging information only for symbols which are used. */
237 int flag_debug_only_used_symbols = 0;
239 /* Nonzero if generating code to do profiling. */
241 int profile_flag = 0;
243 /* Nonzero if generating code to profile program flow graph arcs. */
245 int profile_arc_flag = 0;
247 /* Nonzero if value histograms should be measured. */
249 int flag_profile_values = 0;
251 /* Nonzero if value histograms should be used to optimize code. */
252 int flag_value_profile_transformations = 0;
254 /* Nonzero if generating info for gcov to calculate line test coverage. */
256 int flag_test_coverage = 0;
258 /* Nonzero indicates that branch taken probabilities should be calculated. */
260 int flag_branch_probabilities = 0;
262 /* Nonzero if basic blocks should be reordered. */
264 int flag_reorder_blocks = 0;
266 /* Nonzero if blocks should be partitioned into hot and cold sections in
267 addition to being reordered. */
269 int flag_reorder_blocks_and_partition = 0;
271 /* Nonzero if functions should be reordered. */
273 int flag_reorder_functions = 0;
275 /* Nonzero if registers should be renamed. When
276 flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING it will be set
277 according to optimize and default_debug_hooks in process_options (),
278 but we do not do this yet because it triggers aborts in flow.c. */
279 int flag_rename_registers = 0;
280 int flag_cprop_registers = 0;
282 /* Nonzero for -pedantic switch: warn about anything
283 that standard spec forbids. */
287 /* Temporarily suppress certain warnings.
288 This is set while reading code from a system header file. */
290 int in_system_header = 0;
292 /* Don't print functions as they are compiled. -quiet. */
296 /* Print times taken by the various passes. -ftime-report. */
300 /* Print memory still in use at end of compilation (which may have little
301 to do with peak memory consumption). -fmem-report. */
305 /* Nonzero means to collect statistics which might be expensive
306 and to print them when we are done. */
307 int flag_detailed_statistics = 0;
309 /* A random sequence of characters, unless overridden by user. */
310 const char *flag_random_seed;
312 /* A local time stamp derived from the time of compilation. It will be
313 zero if the system cannot provide a time. It will be -1u, if the
314 user has specified a particular random seed. */
319 /* Nonzero means `char' should be signed. */
321 int flag_signed_char;
323 /* Nonzero means give an enum type only as many bytes as it needs. A value
324 of 2 means it has not yet been initialized. */
326 int flag_short_enums;
328 /* Nonzero for -fcaller-saves: allocate values in regs that need to
329 be saved across function calls, if that produces overall better code.
330 Optional now, so people can test it. */
332 int flag_caller_saves = 0;
334 /* Nonzero if structures and unions should be returned in memory.
336 This should only be defined if compatibility with another compiler or
337 with an ABI is needed, because it results in slower code. */
339 #ifndef DEFAULT_PCC_STRUCT_RETURN
340 #define DEFAULT_PCC_STRUCT_RETURN 1
343 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
345 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
347 /* Nonzero for -fforce-mem: load memory value into a register
348 before arithmetic on it. This makes better cse but slower compilation. */
350 int flag_force_mem = 0;
352 /* Nonzero for -fforce-addr: load memory address into a register before
353 reference to memory. This makes better cse but slower compilation. */
355 int flag_force_addr = 0;
357 /* Nonzero for -fdefer-pop: don't pop args after each function call;
358 instead save them up to pop many calls' args with one insns. */
360 int flag_defer_pop = 0;
362 /* Nonzero for -ffloat-store: don't allocate floats and doubles
363 in extended-precision registers. */
365 int flag_float_store = 0;
367 /* Nonzero for -fcse-follow-jumps:
368 have cse follow jumps to do a more extensive job. */
370 int flag_cse_follow_jumps;
372 /* Nonzero for -fcse-skip-blocks:
373 have cse follow a branch around a block. */
374 int flag_cse_skip_blocks;
376 /* Nonzero for -fexpensive-optimizations:
377 perform miscellaneous relatively-expensive optimizations. */
378 int flag_expensive_optimizations;
380 /* Nonzero for -fthread-jumps:
381 have jump optimize output of loop. */
383 int flag_thread_jumps;
385 /* Nonzero enables strength-reduction in loop.c. */
387 int flag_strength_reduce = 0;
389 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
390 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
391 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
394 int flag_old_unroll_loops;
396 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
397 This is generally not a win. */
399 int flag_old_unroll_all_loops;
401 /* Enables unrolling of simple loops in loop-unroll.c. */
402 int flag_unroll_loops;
404 /* Enables unrolling of all loops in loop-unroll.c. */
405 int flag_unroll_all_loops;
407 /* Nonzero enables loop peeling. */
410 /* Nonzero enables loop unswitching. */
411 int flag_unswitch_loops;
413 /* Nonzero enables prefetch optimizations for arrays in loops. */
415 int flag_prefetch_loop_arrays;
417 /* Nonzero forces all invariant computations in loops to be moved
420 int flag_move_all_movables = 0;
422 /* Nonzero forces all general induction variables in loops to be
425 int flag_reduce_all_givs = 0;
427 /* Nonzero to perform full register move optimization passes. This is the
430 int flag_regmove = 0;
432 /* Nonzero means don't put addresses of constant functions in registers.
433 Used for compiling the Unix kernel, where strange substitutions are
434 done on the assembly output. */
436 int flag_no_function_cse = 0;
438 /* Nonzero for -fomit-frame-pointer:
439 don't make a frame pointer in simple functions that don't require one. */
441 int flag_omit_frame_pointer = 0;
443 /* Nonzero means place each function into its own section on those platforms
444 which support arbitrary section names and unlimited numbers of sections. */
446 int flag_function_sections = 0;
448 /* ... and similar for data. */
450 int flag_data_sections = 0;
452 /* Nonzero to inhibit use of define_optimization peephole opts. */
454 int flag_no_peephole = 0;
456 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
458 int flag_optimize_sibling_calls = 0;
460 /* Nonzero means the front end generally wants `errno' maintained by math
461 operations, like built-in SQRT. */
463 int flag_errno_math = 1;
465 /* Nonzero means that unsafe floating-point math optimizations are allowed
466 for the sake of speed. IEEE compliance is not guaranteed, and operations
467 are allowed to assume that their arguments and results are "normal"
468 (e.g., nonnegative for SQRT). */
470 int flag_unsafe_math_optimizations = 0;
472 /* Nonzero means that no NaNs or +-Infs are expected. */
474 int flag_finite_math_only = 0;
476 /* Zero means that floating-point math operations cannot generate a
477 (user-visible) trap. This is the case, for example, in nonstop
478 IEEE 754 arithmetic. Trapping conditions include division by zero,
479 overflow, underflow, invalid and inexact, but does not include
480 operations on signaling NaNs (see below). */
482 int flag_trapping_math = 1;
484 /* Nonzero means disable transformations that assume default floating
485 point rounding behavior. */
487 int flag_rounding_math = 0;
489 /* Nonzero means disable transformations observable by signaling NaNs.
490 This option implies that any operation on an IEEE signaling NaN can
491 generate a (user-visible) trap. */
493 int flag_signaling_nans = 0;
495 /* 0 means straightforward implementation of complex divide acceptable.
496 1 means wide ranges of inputs must work for complex divide.
497 2 means C99-like requirements for complex divide (not yet implemented). */
499 int flag_complex_divide_method = 0;
501 /* Nonzero means just do syntax checking; don't output anything. */
503 int flag_syntax_only = 0;
505 /* Nonzero means performs web construction pass. When flag_web ==
506 AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize
507 and default_debug_hooks in process_options (). */
509 int flag_web = AUTODETECT_FLAG_VAR_TRACKING;
511 /* Nonzero means perform loop optimizer. */
513 int flag_loop_optimize;
515 /* Nonzero means perform crossjumping. */
517 int flag_crossjumping;
519 /* Nonzero means perform if conversion. */
521 int flag_if_conversion;
523 /* Nonzero means perform if conversion after reload. */
525 int flag_if_conversion2;
527 /* Nonzero means to use global dataflow analysis to eliminate
528 useless null pointer tests. */
530 int flag_delete_null_pointer_checks;
532 /* Nonzero means perform global CSE. */
536 /* Nonzero means to do the enhanced load motion during gcse, which trys
537 to hoist loads by not killing them when a store to the same location
540 int flag_gcse_lm = 1;
542 /* Nonzero means to perform store motion after gcse, which will try to
543 move stores closer to the exit block. Its not very effective without
546 int flag_gcse_sm = 1;
548 /* Nonzero if we want to perform redundant load after store elimination
551 int flag_gcse_las = 1;
553 /* Nonzero means perform global cse after register allocation. */
554 int flag_gcse_after_reload = 0;
556 /* Perform target register optimization before prologue / epilogue
559 int flag_branch_target_load_optimize = 0;
561 /* Perform target register optimization after prologue / epilogue
562 threading and jump2. */
564 int flag_branch_target_load_optimize2 = 0;
566 /* For the bt-load pass, nonzero means don't re-use branch target registers
567 in any basic block. */
569 int flag_btr_bb_exclusive;
571 /* Nonzero means to rerun cse after loop optimization. This increases
572 compilation time about 20% and picks up a few more common expressions. */
574 int flag_rerun_cse_after_loop;
576 /* Nonzero means to run loop optimizations twice. */
578 int flag_rerun_loop_opt;
580 /* Nonzero for -finline-functions: ok to inline functions that look like
581 good inline candidates. */
583 int flag_inline_functions;
585 /* Nonzero for -fkeep-inline-functions: even if we make a function
586 go inline everywhere, keep its definition around for debugging
589 int flag_keep_inline_functions;
591 /* Nonzero means that functions will not be inlined. */
593 int flag_no_inline = 2;
595 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
596 not just because the tree inliner turned us off. */
598 int flag_really_no_inline = 2;
600 /* Nonzero means that we should emit static const variables
601 regardless of whether or not optimization is turned on. */
603 int flag_keep_static_consts = 1;
605 /* Nonzero means we should be saving declaration info into a .X file. */
607 int flag_gen_aux_info = 0;
609 /* Specified name of aux-info file. */
611 const char *aux_info_file_name;
613 /* Nonzero means make the text shared if supported. */
615 int flag_shared_data;
617 /* Nonzero means schedule into delayed branch slots if supported. */
619 int flag_delayed_branch;
621 /* Nonzero if we are compiling pure (sharable) code.
622 Value is 1 if we are doing "small" pic; value is 2 if we're doing
627 /* Nonzero if we are compiling position independent code for executable.
628 The value is 1 if we are doing "small" pic; value is 2 if we're doing
633 /* Nonzero if we are compiling code for a shared library, zero for
638 /* Set to the default thread-local storage (tls) model to use. */
640 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
642 /* Nonzero means generate extra code for exception handling and enable
643 exception handling. */
647 /* Nonzero means generate frame unwind info table when supported. */
649 int flag_unwind_tables = 0;
651 /* Nonzero means generate frame unwind info table exact at each insn
654 int flag_asynchronous_unwind_tables = 0;
656 /* Nonzero means don't place uninitialized global data in common storage
661 /* Nonzero means change certain warnings into errors.
662 Usually these are warnings about failure to conform to some standard. */
664 int flag_pedantic_errors = 0;
666 /* flag_schedule_insns means schedule insns within basic blocks (before
668 flag_schedule_insns_after_reload means schedule insns after
671 int flag_schedule_insns = 0;
672 int flag_schedule_insns_after_reload = 0;
674 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
675 int flag_sched2_use_superblocks = 0;
677 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
679 int flag_sched2_use_traces = 0;
681 /* The following flags have effect only for scheduling before register
684 flag_schedule_interblock means schedule insns across basic blocks.
685 flag_schedule_speculative means allow speculative motion of non-load insns.
686 flag_schedule_speculative_load means allow speculative motion of some
688 flag_schedule_speculative_load_dangerous allows speculative motion of more
691 int flag_schedule_interblock = 1;
692 int flag_schedule_speculative = 1;
693 int flag_schedule_speculative_load = 0;
694 int flag_schedule_speculative_load_dangerous = 0;
696 /* The following flags have an effect during scheduling after register
699 flag_sched_stalled_insns means that insns can be moved prematurely from the queue
700 of stalled insns into the ready list.
702 flag_sched_stalled_insns_dep controls how many insn groups will be examined
703 for a dependency on a stalled insn that is candidate for premature removal
704 from the queue of stalled insns into the ready list (has an effect only if
705 the flag 'sched_stalled_insns' is set). */
707 int flag_sched_stalled_insns = 0;
708 int flag_sched_stalled_insns_dep = 1;
710 int flag_single_precision_constant;
712 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
713 by a cheaper branch on a count register. */
714 int flag_branch_on_count_reg = 1;
716 /* -finhibit-size-directive inhibits output of .size for ELF.
717 This is used only for compiling crtstuff.c,
718 and it may be extended to other effects
719 needed for crtstuff.c on other systems. */
720 int flag_inhibit_size_directive = 0;
722 /* -fverbose-asm causes extra commentary information to be produced in
723 the generated assembly code (to make it more readable). This option
724 is generally only of use to those who actually need to read the
725 generated assembly code (perhaps while debugging the compiler itself).
726 -fno-verbose-asm, the default, causes the extra information
727 to be omitted and is useful when comparing two assembler files. */
729 int flag_verbose_asm = 0;
731 /* -dA causes debug commentary information to be produced in
732 the generated assembly code (to make it more readable). This option
733 is generally only of use to those who actually need to read the
734 generated assembly code (perhaps while debugging the compiler itself).
735 Currently, this switch is only used by dwarfout.c; however, it is intended
736 to be a catchall for printing debug information in the assembler file. */
738 int flag_debug_asm = 0;
740 /* -dP causes the rtl to be emitted as a comment in assembly. */
742 int flag_dump_rtl_in_asm = 0;
744 /* Nonzero means put zero initialized data in the bss section. */
745 int flag_zero_initialized_in_bss = 1;
747 /* Tag all structures with __attribute__(packed). */
748 int flag_pack_struct = 0;
750 /* Emit code to check for stack overflow; also may cause large objects
751 to be allocated dynamically. */
752 int flag_stack_check;
754 /* When non-NULL, indicates that whenever space is allocated on the
755 stack, the resulting stack pointer must not pass this
756 address---that is, for stacks that grow downward, the stack pointer
757 must always be greater than or equal to this address; for stacks
758 that grow upward, the stack pointer must be less than this address.
759 At present, the rtx may be either a REG or a SYMBOL_REF, although
760 the support provided depends on the backend. */
763 /* 0 if pointer arguments may alias each other. True in C.
764 1 if pointer arguments may not alias each other but may alias
766 2 if pointer arguments may not alias each other and may not
767 alias global variables. True in Fortran.
768 This defaults to 0 for C. */
769 int flag_argument_noalias = 0;
771 /* Nonzero if we should do (language-dependent) alias analysis.
772 Typically, this analysis will assume that expressions of certain
773 types do not alias expressions of certain other types. Only used
774 if alias analysis (in general) is enabled. */
775 int flag_strict_aliasing = 0;
777 /* Instrument functions with calls at entry and exit, for profiling. */
778 int flag_instrument_function_entry_exit = 0;
780 /* Nonzero means ignore `#ident' directives. 0 means handle them.
781 On SVR4 targets, it also controls whether or not to emit a
782 string identifying the compiler. */
784 int flag_no_ident = 0;
786 /* This will perform a peephole pass before sched2. */
787 int flag_peephole2 = 0;
789 /* This will try to guess branch probabilities. */
790 int flag_guess_branch_prob = 0;
792 /* -fcheck-bounds causes gcc to generate array bounds checks.
793 For C, C++, ObjC: defaults to off.
794 For Java: defaults to on.
795 For Fortran: defaults to off. */
796 int flag_bounds_check = 0;
798 /* Mudflap bounds-checking transform. */
799 int flag_mudflap = 0;
800 int flag_mudflap_threads = 0;
801 int flag_mudflap_ignore_reads = 0;
803 /* This will attempt to merge constant section constants, if 1 only
804 string constants and constants from constant pool, if 2 also constant
806 int flag_merge_constants = 1;
808 /* If one, renumber instruction UIDs to reduce the number of
809 unused UIDs if there are a lot of instructions. If greater than
810 one, unconditionally renumber instruction UIDs. */
811 int flag_renumber_insns = 1;
813 /* If nonzero, use the graph coloring register allocator. */
814 int flag_new_regalloc = 0;
816 /* If nonzero, use tree-based instead of rtl-based profiling. */
817 int flag_tree_based_profiling = 0;
819 /* Enable SSA-GVN on trees. */
820 int flag_tree_gvn = 0;
822 /* Enable the SSA-PRE tree optimization. */
823 int flag_tree_pre = 0;
825 /* Enable points-to analysis on trees. */
826 enum pta_type flag_tree_points_to = PTA_NONE;
828 /* Enable SSA-CCP on trees. */
829 int flag_tree_ccp = 0;
831 /* Enable SSA-DCE on trees. */
832 int flag_tree_dce = 0;
834 /* Enable loop header copying on tree-ssa. */
835 int flag_tree_ch = 0;
837 /* Enable scalar replacement of aggregates. */
838 int flag_tree_sra = 0;
840 /* Enable SSA->normal pass memory location coalescing. */
841 int flag_tree_combine_temps = 0;
843 /* Enable SSA->normal pass expression replacement. */
844 int flag_tree_ter = 0;
846 /* Enable SSA->normal live range splitting. */
847 int flag_tree_live_range_split = 0;
849 /* Enable dominator optimizations. */
850 int flag_tree_dom = 0;
852 /* Enable copy rename optimization. */
853 int flag_tree_copyrename = 0;
855 /* Enable dead store elimination. */
856 int flag_tree_dse = 0;
858 /* Nonzero if we perform superblock formation. */
861 /* Nonzero if we perform whole unit at a time compilation. */
863 int flag_unit_at_a_time = 0;
865 /* Nonzero if we should track variables. When
866 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
867 to optimize, debug_info_level and debug_hooks in process_options (). */
868 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
870 /* Values of the -falign-* flags: how much to align labels in code.
871 0 means `use default', 1 means `don't align'.
872 For each variable, there is an _log variant which is the power
873 of two not less than the variable, for .align output. */
877 int align_loops_max_skip;
880 int align_jumps_max_skip;
882 int align_labels_log;
883 int align_labels_max_skip;
885 int align_functions_log;
887 /* Like align_functions_log above, but used by front-ends to force the
888 minimum function alignment. Zero means no alignment is forced. */
889 int force_align_functions_log;
893 const char *const string;
897 lang_independent_options;
899 /* Nonzero if signed arithmetic overflow should trap. */
902 /* Nonzero if signed arithmetic overflow should wrap around. */
905 /* Nonzero if subexpressions must be evaluated from left-to-right. */
906 int flag_evaluation_order = 0;
908 /* Add or remove a leading underscore from user symbols. */
909 int flag_leading_underscore = -1;
911 /* The version of the C++ ABI in use. The following values are
914 0: The version of the ABI believed most conformant with the
915 C++ ABI specification. This ABI may change as bugs are
916 discovered and fixed. Therefore, 0 will not necessarily
917 indicate the same ABI in different versions of G++.
919 1: The version of the ABI first used in G++ 3.2.
921 2: The version of the ABI first used in G++ 3.4.
923 Additional positive integers will be assigned as new versions of
924 the ABI become the default version of the ABI. */
926 int flag_abi_version = 2;
928 /* The user symbol prefix after having resolved same. */
929 const char *user_label_prefix;
931 static const param_info lang_independent_params[] = {
932 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
933 { OPTION, DEFAULT, HELP },
934 #include "params.def"
939 /* Table of language-independent -f options.
940 STRING is the option name. VARIABLE is the address of the variable.
941 ON_VALUE is the value to store in VARIABLE
942 if `-fSTRING' is seen as an option.
943 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
945 static const lang_independent_options f_options[] =
947 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
948 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
949 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
950 {"float-store", &flag_float_store, 1 },
951 {"defer-pop", &flag_defer_pop, 1 },
952 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
953 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
954 {"tracer", &flag_tracer, 1 },
955 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
956 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
957 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
958 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
959 {"thread-jumps", &flag_thread_jumps, 1 },
960 {"strength-reduce", &flag_strength_reduce, 1 },
961 {"unroll-loops", &flag_unroll_loops, 1 },
962 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
963 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
964 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
965 {"peel-loops", &flag_peel_loops, 1 },
966 {"unswitch-loops", &flag_unswitch_loops, 1 },
967 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
968 {"move-all-movables", &flag_move_all_movables, 1 },
969 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
970 {"peephole", &flag_no_peephole, 0 },
971 {"force-mem", &flag_force_mem, 1 },
972 {"force-addr", &flag_force_addr, 1 },
973 {"function-cse", &flag_no_function_cse, 0 },
974 {"inline-functions", &flag_inline_functions, 1 },
975 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
976 {"inline", &flag_no_inline, 0 },
977 {"keep-static-consts", &flag_keep_static_consts, 1 },
978 {"syntax-only", &flag_syntax_only, 1 },
979 {"shared-data", &flag_shared_data, 1 },
980 {"caller-saves", &flag_caller_saves, 1 },
981 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
982 {"reg-struct-return", &flag_pcc_struct_return, 0 },
983 {"delayed-branch", &flag_delayed_branch, 1 },
984 {"web", &flag_web, 1},
985 {"gcse", &flag_gcse, 1 },
986 {"gcse-lm", &flag_gcse_lm, 1 },
987 {"gcse-sm", &flag_gcse_sm, 1 },
988 {"gcse-las", &flag_gcse_las, 1 },
989 {"gcse-after-reload", &flag_gcse_after_reload, 1},
990 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
991 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
992 {"btr-bb-exclusive", &flag_btr_bb_exclusive, 1 },
993 {"loop-optimize", &flag_loop_optimize, 1 },
994 {"crossjumping", &flag_crossjumping, 1 },
995 {"if-conversion", &flag_if_conversion, 1 },
996 {"if-conversion2", &flag_if_conversion2, 1 },
997 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
998 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
999 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1000 {"schedule-insns", &flag_schedule_insns, 1 },
1001 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1002 {"sched-interblock",&flag_schedule_interblock, 1 },
1003 {"sched-spec",&flag_schedule_speculative, 1 },
1004 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1005 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1006 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1007 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1008 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1009 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1010 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1011 {"pic", &flag_pic, 1 },
1012 {"PIC", &flag_pic, 2 },
1013 {"pie", &flag_pie, 1 },
1014 {"PIE", &flag_pie, 2 },
1015 {"exceptions", &flag_exceptions, 1 },
1016 {"unwind-tables", &flag_unwind_tables, 1 },
1017 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1018 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1019 {"profile-arcs", &profile_arc_flag, 1 },
1020 {"profile-values", &flag_profile_values, 1 },
1021 {"vpt", &flag_value_profile_transformations, 1 },
1022 {"test-coverage", &flag_test_coverage, 1 },
1023 {"branch-probabilities", &flag_branch_probabilities, 1 },
1024 {"profile", &profile_flag, 1 },
1025 {"tree-based-profiling", &flag_tree_based_profiling, 1 },
1026 {"reorder-blocks", &flag_reorder_blocks, 1 },
1027 {"reorder-blocks-and-partition", &flag_reorder_blocks_and_partition, 1},
1028 {"reorder-functions", &flag_reorder_functions, 1 },
1029 {"rename-registers", &flag_rename_registers, 1 },
1030 {"cprop-registers", &flag_cprop_registers, 1 },
1031 {"common", &flag_no_common, 0 },
1032 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1033 {"function-sections", &flag_function_sections, 1 },
1034 {"data-sections", &flag_data_sections, 1 },
1035 {"verbose-asm", &flag_verbose_asm, 1 },
1036 {"regmove", &flag_regmove, 1 },
1037 {"optimize-register-move", &flag_regmove, 1 },
1038 {"pack-struct", &flag_pack_struct, 1 },
1039 {"stack-check", &flag_stack_check, 1 },
1040 {"argument-alias", &flag_argument_noalias, 0 },
1041 {"argument-noalias", &flag_argument_noalias, 1 },
1042 {"argument-noalias-global", &flag_argument_noalias, 2 },
1043 {"strict-aliasing", &flag_strict_aliasing, 1 },
1044 {"align-loops", &align_loops, 0 },
1045 {"align-jumps", &align_jumps, 0 },
1046 {"align-labels", &align_labels, 0 },
1047 {"align-functions", &align_functions, 0 },
1048 {"merge-constants", &flag_merge_constants, 1 },
1049 {"merge-all-constants", &flag_merge_constants, 2 },
1050 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1051 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1052 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1053 {"leading-underscore", &flag_leading_underscore, 1 },
1054 {"ident", &flag_no_ident, 0 },
1055 { "peephole2", &flag_peephole2, 1 },
1056 {"finite-math-only", &flag_finite_math_only, 1 },
1057 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1058 {"math-errno", &flag_errno_math, 1 },
1059 {"trapping-math", &flag_trapping_math, 1 },
1060 {"rounding-math", &flag_rounding_math, 1 },
1061 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1062 {"signaling-nans", &flag_signaling_nans, 1 },
1063 {"bounds-check", &flag_bounds_check, 1 },
1064 {"single-precision-constant", &flag_single_precision_constant, 1 },
1065 {"time-report", &time_report, 1 },
1066 {"mem-report", &mem_report, 1 },
1067 { "trapv", &flag_trapv, 1 },
1068 { "wrapv", &flag_wrapv, 1 },
1069 { "new-ra", &flag_new_regalloc, 1 },
1070 { "var-tracking", &flag_var_tracking, 1},
1071 { "tree-gvn", &flag_tree_gvn, 1 },
1072 { "tree-pre", &flag_tree_pre, 1 },
1073 { "tree-ccp", &flag_tree_ccp, 1 },
1074 { "tree-dce", &flag_tree_dce, 1 },
1075 { "tree-dominator-opts", &flag_tree_dom, 1 },
1076 { "tree-copyrename", &flag_tree_copyrename, 1 },
1077 { "tree-dse", &flag_tree_dse, 1 },
1078 { "tree-combine-temps", &flag_tree_combine_temps, 1 },
1079 { "tree-ter", &flag_tree_ter, 1 },
1080 { "tree-lrs", &flag_tree_live_range_split, 1 },
1081 { "tree-ch", &flag_tree_ch, 1 }
1084 /* Here is a table, controlled by the tm.h file, listing each -m switch
1085 and which bits in `target_switches' it should set or clear.
1086 If VALUE is positive, it is bits to set.
1087 If VALUE is negative, -VALUE is bits to clear.
1088 (The sign bit is not used so there is no confusion.) */
1092 const char *const name;
1094 const char *const description;
1096 target_switches[] = TARGET_SWITCHES;
1098 /* This table is similar, but allows the switch to have a value. */
1100 #ifdef TARGET_OPTIONS
1103 const char *const prefix;
1104 const char **const variable;
1105 const char *const description;
1106 const char *const value;
1108 target_options[] = TARGET_OPTIONS;
1111 /* Nonzero means warn about function definitions that default the return type
1112 or that use a null return and have a return-type other than void. */
1114 int warn_return_type;
1116 /* Output files for assembler code (real compiler output)
1117 and debugging dumps. */
1120 FILE *aux_info_file;
1121 FILE *dump_file = NULL;
1122 FILE *cgraph_dump_file = NULL;
1124 /* The current working directory of a translation. It's generally the
1125 directory from which compilation was initiated, but a preprocessed
1126 file may specify the original directory in which it was
1129 static const char *src_pwd;
1131 /* Initialize src_pwd with the given string, and return true. If it
1132 was already initialized, return false. As a special case, it may
1133 be called with a NULL argument to test whether src_pwd has NOT been
1137 set_src_pwd (const char *pwd)
1141 if (strcmp (src_pwd, pwd) == 0)
1147 src_pwd = xstrdup (pwd);
1151 /* Return the directory from which the translation unit was initiated,
1152 in case set_src_pwd() was not called before to assign it a
1159 src_pwd = getpwd ();
1164 /* Called when the start of a function definition is parsed,
1165 this function prints on stderr the name of the function. */
1167 announce_function (tree decl)
1171 if (rtl_dump_and_exit)
1172 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1174 verbatim (" %s", lang_hooks.decl_printable_name (decl, 2));
1176 pp_needs_newline (global_dc->printer) = true;
1177 diagnostic_set_last_function (global_dc);
1181 /* Set up a default flag_random_seed and local_tick, unless the user
1182 already specified one. */
1187 if (!flag_random_seed)
1189 unsigned HOST_WIDE_INT value;
1190 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1192 /* Get some more or less random data. */
1193 #ifdef HAVE_GETTIMEOFDAY
1197 gettimeofday (&tv, NULL);
1198 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1202 time_t now = time (NULL);
1204 if (now != (time_t)-1)
1205 local_tick = (unsigned) now;
1208 value = local_tick ^ getpid ();
1210 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1211 flag_random_seed = random_seed;
1213 else if (!local_tick)
1218 /* Decode the string P as an integral parameter.
1219 If the string is indeed an integer return its numeric value else
1220 issue an Invalid Option error for the option PNAME and return DEFVAL.
1221 If PNAME is zero just return DEFVAL, do not call error. */
1224 read_integral_parameter (const char *p, const char *pname, const int defval)
1226 const char *endp = p;
1230 if (ISDIGIT (*endp))
1239 error ("invalid option argument `%s'", pname);
1246 /* Return the logarithm of X, base 2, considering X unsigned,
1247 if X is a power of 2. Otherwise, returns -1.
1249 This should be used via the `exact_log2' macro. */
1252 exact_log2_wide (unsigned HOST_WIDE_INT x)
1255 /* Test for 0 or a power of 2. */
1256 if (x == 0 || x != (x & -x))
1258 while ((x >>= 1) != 0)
1263 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1264 If X is 0, return -1.
1266 This should be used via the floor_log2 macro. */
1269 floor_log2_wide (unsigned HOST_WIDE_INT x)
1278 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1279 into ICE messages, which is much more user friendly. In case the
1280 error printer crashes, reset the signal to prevent infinite recursion. */
1283 crash_signal (int signo)
1285 signal (signo, SIG_DFL);
1286 internal_error ("%s", strsignal (signo));
1289 /* Arrange to dump core on error. (The regular error message is still
1290 printed first, except in the case of abort().) */
1293 setup_core_dumping (void)
1296 signal (SIGABRT, SIG_DFL);
1298 #if defined(HAVE_SETRLIMIT)
1301 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1302 fatal_error ("getting core file size maximum limit: %m");
1303 rlim.rlim_cur = rlim.rlim_max;
1304 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1305 fatal_error ("setting core file size limit to maximum: %m");
1308 diagnostic_abort_on_error (global_dc);
1312 /* Strip off a legitimate source ending from the input string NAME of
1313 length LEN. Rather than having to know the names used by all of
1314 our front ends, we strip off an ending of a period followed by
1315 up to five characters. (Java uses ".class".) */
1318 strip_off_ending (char *name, int len)
1321 for (i = 2; i < 6 && len > i; i++)
1323 if (name[len - i] == '.')
1325 name[len - i] = '\0';
1331 /* Output a quoted string. */
1334 output_quoted_string (FILE *asm_file, const char *string)
1336 #ifdef OUTPUT_QUOTED_STRING
1337 OUTPUT_QUOTED_STRING (asm_file, string);
1341 putc ('\"', asm_file);
1342 while ((c = *string++) != 0)
1346 if (c == '\"' || c == '\\')
1347 putc ('\\', asm_file);
1351 fprintf (asm_file, "\\%03o", (unsigned char) c);
1353 putc ('\"', asm_file);
1357 /* Output a file name in the form wanted by System V. */
1360 output_file_directive (FILE *asm_file, const char *input_name)
1365 if (input_name == NULL)
1366 input_name = "<stdin>";
1368 len = strlen (input_name);
1369 na = input_name + len;
1371 /* NA gets INPUT_NAME sans directory names. */
1372 while (na > input_name)
1374 if (IS_DIR_SEPARATOR (na[-1]))
1379 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1380 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1382 fprintf (asm_file, "\t.file\t");
1383 output_quoted_string (asm_file, na);
1384 fputc ('\n', asm_file);
1388 /* Do any final processing required for the declarations in VEC, of
1389 which there are LEN. We write out inline functions and variables
1390 that have been deferred until this point, but which are required.
1391 Returns nonzero if anything was put out. */
1394 wrapup_global_declarations (tree *vec, int len)
1399 int output_something = 0;
1401 for (i = 0; i < len; i++)
1405 /* We're not deferring this any longer. Assignment is
1406 conditional to avoid needlessly dirtying PCH pages. */
1407 if (DECL_DEFER_OUTPUT (decl) != 0)
1408 DECL_DEFER_OUTPUT (decl) = 0;
1410 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1411 lang_hooks.finish_incomplete_decl (decl);
1414 /* Now emit any global variables or functions that we have been
1415 putting off. We need to loop in case one of the things emitted
1416 here references another one which comes earlier in the list. */
1420 for (i = 0; i < len; i++)
1424 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1427 /* Don't write out static consts, unless we still need them.
1429 We also keep static consts if not optimizing (for debugging),
1430 unless the user specified -fno-keep-static-consts.
1431 ??? They might be better written into the debug information.
1432 This is possible when using DWARF.
1434 A language processor that wants static constants to be always
1435 written out (even if it is not used) is responsible for
1436 calling rest_of_decl_compilation itself. E.g. the C front-end
1437 calls rest_of_decl_compilation from finish_decl.
1438 One motivation for this is that is conventional in some
1439 environments to write things like:
1440 static const char rcsid[] = "... version string ...";
1441 intending to force the string to be in the executable.
1443 A language processor that would prefer to have unneeded
1444 static constants "optimized away" would just defer writing
1445 them out until here. E.g. C++ does this, because static
1446 constants are often defined in header files.
1448 ??? A tempting alternative (for both C and C++) would be
1449 to force a constant to be written if and only if it is
1450 defined in a main file, as opposed to an include file. */
1452 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1456 if (flag_unit_at_a_time
1457 && cgraph_varpool_node (decl)->finalized)
1459 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1460 && (TREE_USED (decl)
1461 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1463 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1465 else if (DECL_COMDAT (decl))
1467 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1468 && (optimize || !flag_keep_static_consts
1469 || DECL_ARTIFICIAL (decl)))
1475 rest_of_decl_compilation (decl, NULL, 1, 1);
1481 output_something = 1;
1485 return output_something;
1488 /* Issue appropriate warnings for the global declarations in VEC (of
1489 which there are LEN). Output debugging information for them. */
1492 check_global_declarations (tree *vec, int len)
1497 for (i = 0; i < len; i++)
1501 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1502 && ! TREE_ASM_WRITTEN (decl))
1503 /* Cancel the RTL for this decl so that, if debugging info
1504 output for global variables is still to come,
1505 this one will be omitted. */
1506 SET_DECL_RTL (decl, NULL_RTX);
1508 /* Warn about any function
1509 declared static but not defined.
1510 We don't warn about variables,
1511 because many programs have static variables
1512 that exist only to get some text into the object file. */
1513 if (TREE_CODE (decl) == FUNCTION_DECL
1514 && (warn_unused_function
1515 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1516 && DECL_INITIAL (decl) == 0
1517 && DECL_EXTERNAL (decl)
1518 && ! DECL_ARTIFICIAL (decl)
1519 && ! TREE_PUBLIC (decl))
1521 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1522 pedwarn ("%J'%F' used but never defined", decl, decl);
1524 warning ("%J'%F' declared `static' but never defined", decl, decl);
1525 /* This symbol is effectively an "extern" declaration now. */
1526 TREE_PUBLIC (decl) = 1;
1527 assemble_external (decl);
1530 /* Warn about static fns or vars defined but not used. */
1531 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1532 /* We don't warn about "static const" variables because the
1533 "rcs_id" idiom uses that construction. */
1534 || (warn_unused_variable
1535 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1536 && ! DECL_IN_SYSTEM_HEADER (decl)
1537 && ! TREE_USED (decl)
1538 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1539 to handle multiple external decls in different scopes. */
1540 && ! TREE_USED (DECL_NAME (decl))
1541 && ! DECL_EXTERNAL (decl)
1542 && ! TREE_PUBLIC (decl)
1543 /* A volatile variable might be used in some non-obvious way. */
1544 && ! TREE_THIS_VOLATILE (decl)
1545 /* Global register variables must be declared to reserve them. */
1546 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1547 /* Otherwise, ask the language. */
1548 && lang_hooks.decls.warn_unused_global (decl))
1549 warning ("%J'%D' defined but not used", decl, decl);
1551 /* Avoid confusing the debug information machinery when there are
1553 if (errorcount == 0 && sorrycount == 0)
1555 timevar_push (TV_SYMOUT);
1556 (*debug_hooks->global_decl) (decl);
1557 timevar_pop (TV_SYMOUT);
1562 /* Warn about a use of an identifier which was marked deprecated. */
1564 warn_deprecated_use (tree node)
1566 if (node == 0 || !warn_deprecated_decl)
1570 warning ("`%s' is deprecated (declared at %s:%d)",
1571 IDENTIFIER_POINTER (DECL_NAME (node)),
1572 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1573 else if (TYPE_P (node))
1575 const char *what = NULL;
1576 tree decl = TYPE_STUB_DECL (node);
1578 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1579 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1580 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1581 && DECL_NAME (TYPE_NAME (node)))
1582 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1587 warning ("`%s' is deprecated (declared at %s:%d)", what,
1588 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1590 warning ("`%s' is deprecated", what);
1593 warning ("type is deprecated (declared at %s:%d)",
1594 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1596 warning ("type is deprecated");
1600 /* Save the current INPUT_LOCATION on the top entry in the
1601 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1602 INPUT_LOCATION accordingly. */
1605 push_srcloc (const char *file, int line)
1607 struct file_stack *fs;
1609 fs = xmalloc (sizeof (struct file_stack));
1610 fs->location = input_location;
1611 fs->next = input_file_stack;
1612 input_filename = file;
1614 input_file_stack = fs;
1615 input_file_stack_tick++;
1618 /* Pop the top entry off the stack of presently open source files.
1619 Restore the INPUT_LOCATION from the new topmost entry on the
1625 struct file_stack *fs;
1627 fs = input_file_stack;
1628 input_location = fs->location;
1629 input_file_stack = fs->next;
1631 input_file_stack_tick++;
1634 /* Compile an entire translation unit. Write a file of assembly
1635 output and various debugging dumps. */
1640 /* Initialize yet another pass. */
1642 init_final (main_input_filename);
1643 coverage_init (aux_base_name);
1645 timevar_push (TV_PARSE);
1647 /* Call the parser, which parses the entire file (calling
1648 rest_of_compilation for each function). */
1649 lang_hooks.parse_file (set_yydebug);
1651 /* In case there were missing block closers,
1652 get us back to the global binding level. */
1653 lang_hooks.clear_binding_stack ();
1655 /* Compilation is now finished except for writing
1656 what's left of the symbol table output. */
1657 timevar_pop (TV_PARSE);
1659 if (flag_syntax_only)
1662 lang_hooks.decls.final_write_globals ();
1664 cgraph_varpool_assemble_pending_decls ();
1666 /* This must occur after the loop to output deferred functions.
1667 Else the coverage initializer would not be emitted if all the
1668 functions in this compilation unit were deferred. */
1671 /* Write out any pending weak symbol declarations. */
1675 /* Do dbx symbols. */
1676 timevar_push (TV_SYMOUT);
1678 #ifdef DWARF2_UNWIND_INFO
1679 if (dwarf2out_do_frame ())
1680 dwarf2out_frame_finish ();
1683 (*debug_hooks->finish) (main_input_filename);
1684 timevar_pop (TV_SYMOUT);
1686 /* Output some stuff at end of file if nec. */
1688 dw2_output_indirect_constants ();
1690 /* Attach a special .ident directive to the end of the file to identify
1691 the version of GCC which compiled this code. The format of the .ident
1692 string is patterned after the ones produced by native SVR4 compilers. */
1695 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1696 IDENT_ASM_OP, version_string);
1699 /* This must be at the end. Some target ports emit end of file directives
1700 into the assembly file here, and hence we can not output anything to the
1701 assembly file after this point. */
1702 targetm.asm_out.file_end ();
1705 /* Display help for target options. */
1707 display_target_options (void)
1710 static bool displayed = false;
1712 /* Avoid double printing for --help --target-help. */
1718 if (ARRAY_SIZE (target_switches) > 1
1719 #ifdef TARGET_OPTIONS
1720 || ARRAY_SIZE (target_options) > 1
1728 printf (_("\nTarget specific options:\n"));
1730 for (i = ARRAY_SIZE (target_switches); i--;)
1732 const char *option = target_switches[i].name;
1733 const char *description = target_switches[i].description;
1735 if (option == NULL || *option == 0)
1737 else if (description == NULL)
1742 printf (_(" -m%-23s [undocumented]\n"), option);
1744 else if (*description != 0)
1745 doc += printf (" -m%-23s %s\n", option, _(description));
1748 #ifdef TARGET_OPTIONS
1749 for (i = ARRAY_SIZE (target_options); i--;)
1751 const char *option = target_options[i].prefix;
1752 const char *description = target_options[i].description;
1754 if (option == NULL || *option == 0)
1756 else if (description == NULL)
1761 printf (_(" -m%-23s [undocumented]\n"), option);
1763 else if (*description != 0)
1764 doc += printf (" -m%-23s %s\n", option, _(description));
1770 printf (_("\nThere are undocumented target specific options as well.\n"));
1772 printf (_(" They exist, but they are not documented.\n"));
1777 /* Parse a -d... command line switch. */
1780 decode_d_option (const char *arg)
1791 flag_print_asm_name = 1;
1794 flag_dump_rtl_in_asm = 1;
1795 flag_print_asm_name = 1;
1798 graph_dump_format = vcg;
1801 rtl_dump_and_exit = 1;
1806 case 'D': /* These are handled by the preprocessor. */
1810 setup_core_dumping();
1815 if (!enable_rtl_dump_file (c))
1816 warning ("unrecognized gcc debugging option: %c", c);
1821 /* Indexed by enum debug_info_type. */
1822 const char *const debug_type_names[] =
1824 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1827 /* Decode -m switches. */
1828 /* Decode the switch -mNAME. */
1831 set_target_switch (const char *name)
1834 int valid_target_option = 0;
1836 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1837 if (!strcmp (target_switches[j].name, name))
1839 if (target_switches[j].value < 0)
1840 target_flags &= ~-target_switches[j].value;
1842 target_flags |= target_switches[j].value;
1845 if (target_switches[j].value < 0)
1846 target_flags_explicit |= -target_switches[j].value;
1848 target_flags_explicit |= target_switches[j].value;
1850 valid_target_option = 1;
1853 #ifdef TARGET_OPTIONS
1854 if (!valid_target_option)
1855 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1857 int len = strlen (target_options[j].prefix);
1858 if (target_options[j].value)
1860 if (!strcmp (target_options[j].prefix, name))
1862 *target_options[j].variable = target_options[j].value;
1863 valid_target_option = 1;
1868 if (!strncmp (target_options[j].prefix, name, len))
1870 *target_options[j].variable = name + len;
1871 valid_target_option = 1;
1877 if (!valid_target_option)
1878 error ("invalid option `%s'", name);
1881 /* Print version information to FILE.
1882 Each line begins with INDENT (for the case where FILE is the
1883 assembler output file). */
1886 print_version (FILE *file, const char *indent)
1889 #define __VERSION__ "[?]"
1893 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1895 "%s%s%s version %s (%s) compiled by CC.\n"
1897 , indent, *indent != 0 ? " " : "",
1898 lang_hooks.name, version_string, TARGET_NAME,
1899 indent, __VERSION__);
1900 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1901 indent, *indent != 0 ? " " : "",
1902 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1905 /* Print an option value and return the adjusted position in the line.
1906 ??? We don't handle error returns from fprintf (disk full); presumably
1907 other code will catch a disk full though. */
1910 print_single_switch (FILE *file, int pos, int max,
1911 const char *indent, const char *sep, const char *term,
1912 const char *type, const char *name)
1914 /* The ultrix fprintf returns 0 on success, so compute the result we want
1915 here since we need it for the following test. */
1916 int len = strlen (sep) + strlen (type) + strlen (name);
1921 fprintf (file, "%s", term);
1926 fprintf (file, "%s", indent);
1927 pos = strlen (indent);
1929 fprintf (file, "%s%s%s", sep, type, name);
1934 /* Print active target switches to FILE.
1935 POS is the current cursor position and MAX is the size of a "line".
1936 Each line begins with INDENT and ends with TERM.
1937 Each switch is separated from the next by SEP. */
1940 print_switch_values (FILE *file, int pos, int max,
1941 const char *indent, const char *sep, const char *term)
1946 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1947 that it can be printed below. This helps reproducibility. */
1950 /* Print the options as passed. */
1951 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1952 _("options passed: "), "");
1954 for (p = &save_argv[1]; *p != NULL; p++)
1958 if (strcmp (*p, "-o") == 0)
1964 if (strcmp (*p, "-quiet") == 0)
1966 if (strcmp (*p, "-version") == 0)
1971 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1974 fprintf (file, "%s", term);
1976 /* Print the -f and -m options that have been enabled.
1977 We don't handle language specific options but printing argv
1980 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1981 _("options enabled: "), "");
1983 for (j = 0; j < ARRAY_SIZE (f_options); j++)
1984 if (*f_options[j].variable == f_options[j].on_value)
1985 pos = print_single_switch (file, pos, max, indent, sep, term,
1986 "-f", f_options[j].string);
1988 /* Print target specific options. */
1990 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1991 if (target_switches[j].name[0] != '\0'
1992 && target_switches[j].value > 0
1993 && ((target_switches[j].value & target_flags)
1994 == target_switches[j].value))
1996 pos = print_single_switch (file, pos, max, indent, sep, term,
1997 "-m", target_switches[j].name);
2000 #ifdef TARGET_OPTIONS
2001 for (j = 0; j < ARRAY_SIZE (target_options); j++)
2002 if (*target_options[j].variable != NULL)
2005 sprintf (prefix, "-m%s", target_options[j].prefix);
2006 pos = print_single_switch (file, pos, max, indent, sep, term,
2007 prefix, *target_options[j].variable);
2011 fprintf (file, "%s", term);
2014 /* Open assembly code output file. Do this even if -fsyntax-only is
2015 on, because then the driver will have provided the name of a
2016 temporary file or bit bucket for us. NAME is the file specified on
2017 the command line, possibly NULL. */
2019 init_asm_output (const char *name)
2021 if (name == NULL && asm_file_name == 0)
2022 asm_out_file = stdout;
2025 if (asm_file_name == 0)
2027 int len = strlen (dump_base_name);
2028 char *dumpname = xmalloc (len + 6);
2029 memcpy (dumpname, dump_base_name, len + 1);
2030 strip_off_ending (dumpname, len);
2031 strcat (dumpname, ".s");
2032 asm_file_name = dumpname;
2034 if (!strcmp (asm_file_name, "-"))
2035 asm_out_file = stdout;
2037 asm_out_file = fopen (asm_file_name, "w+");
2038 if (asm_out_file == 0)
2039 fatal_error ("can't open %s for writing: %m", asm_file_name);
2042 #ifdef IO_BUFFER_SIZE
2043 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
2044 _IOFBF, IO_BUFFER_SIZE);
2047 if (!flag_syntax_only)
2049 targetm.asm_out.file_start ();
2051 #ifdef ASM_COMMENT_START
2052 if (flag_verbose_asm)
2054 /* Print the list of options in effect. */
2055 print_version (asm_out_file, ASM_COMMENT_START);
2056 print_switch_values (asm_out_file, 0, MAX_LINE,
2057 ASM_COMMENT_START, " ", "\n");
2058 /* Add a blank line here so it appears in assembler output but not
2060 fprintf (asm_out_file, "\n");
2066 /* Default version of get_pch_validity.
2067 By default, every flag difference is fatal; that will be mostly right for
2068 most targets, but completely right for very few. */
2071 default_get_pch_validity (size_t *len)
2073 #ifdef TARGET_OPTIONS
2078 *len = sizeof (target_flags) + 2;
2079 #ifdef TARGET_OPTIONS
2080 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2083 if (*target_options[i].variable)
2084 *len += strlen (*target_options[i].variable);
2088 result = r = xmalloc (*len);
2092 memcpy (r, &target_flags, sizeof (target_flags));
2093 r += sizeof (target_flags);
2095 #ifdef TARGET_OPTIONS
2096 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2098 const char *str = *target_options[i].variable;
2102 l = strlen (str) + 1;
2111 /* Default version of pch_valid_p. */
2114 default_pch_valid_p (const void *data_p, size_t len)
2116 const char *data = (const char *)data_p;
2117 const char *flag_that_differs = NULL;
2120 /* -fpic and -fpie also usually make a PCH invalid. */
2121 if (data[0] != flag_pic)
2122 return _("created and used with different settings of -fpic");
2123 if (data[1] != flag_pie)
2124 return _("created and used with different settings of -fpie");
2127 /* Check target_flags. */
2128 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
2130 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
2135 memcpy (&tf, data, sizeof (target_flags));
2137 bits = target_switches[i].value;
2140 if ((target_flags & bits) != (tf & bits))
2142 flag_that_differs = target_switches[i].name;
2148 data += sizeof (target_flags);
2149 len -= sizeof (target_flags);
2151 /* Check string options. */
2152 #ifdef TARGET_OPTIONS
2153 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2155 const char *str = *target_options[i].variable;
2159 l = strlen (str) + 1;
2160 if (len < l || memcmp (data, str, l) != 0)
2162 flag_that_differs = target_options[i].prefix;
2175 asprintf (&r, _("created and used with differing settings of `-m%s'"),
2178 return _("out of memory");
2183 /* Default tree printer. Handles declarations only. */
2185 default_tree_printer (pretty_printer * pp, text_info *text)
2187 switch (*text->format_spec)
2193 tree t = va_arg (*text->args_ptr, tree);
2194 const char *n = DECL_NAME (t)
2195 ? lang_hooks.decl_printable_name (t, 2)
2206 /* Initialization of the front end environment, before command line
2207 options are parsed. Signal handlers, internationalization etc.
2208 ARGV0 is main's argv[0]. */
2210 general_init (const char *argv0)
2214 p = argv0 + strlen (argv0);
2215 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
2219 xmalloc_set_program_name (progname);
2223 gcc_init_libintl ();
2225 /* Initialize the diagnostics reporting machinery, so option parsing
2226 can give warnings and errors. */
2227 diagnostic_initialize (global_dc);
2228 /* Set a default printer. Language specific initializations will
2229 override it later. */
2230 pp_format_decoder (global_dc->printer) = &default_tree_printer;
2232 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
2234 signal (SIGSEGV, crash_signal);
2237 signal (SIGILL, crash_signal);
2240 signal (SIGBUS, crash_signal);
2243 signal (SIGABRT, crash_signal);
2245 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
2246 signal (SIGIOT, crash_signal);
2249 signal (SIGFPE, crash_signal);
2252 /* Other host-specific signal setup. */
2253 (*host_hooks.extra_signals)();
2255 /* Initialize the garbage-collector, string pools and tree type hash
2259 linemap_init (&line_table);
2262 /* Initialize register usage now so switches may override. */
2265 /* Register the language-independent parameters. */
2266 add_params (lang_independent_params, LAST_PARAM);
2268 /* This must be done after add_params but before argument processing. */
2269 init_ggc_heuristics();
2270 init_tree_optimization_passes ();
2273 /* Process the options that have been parsed. */
2275 process_options (void)
2277 /* Allow the front end to perform consistency checks and do further
2278 initialization based on the command line options. This hook also
2279 sets the original filename if appropriate (e.g. foo.i -> foo.c)
2280 so we can correctly initialize debug output. */
2281 no_backend = lang_hooks.post_options (&main_input_filename);
2282 input_filename = main_input_filename;
2284 #ifdef OVERRIDE_OPTIONS
2285 /* Some machines may reject certain combinations of options. */
2289 if (flag_short_enums == 2)
2290 flag_short_enums = targetm.default_short_enums ();
2292 /* Set aux_base_name if not already set. */
2295 else if (main_input_filename)
2297 char *name = xstrdup (lbasename (main_input_filename));
2299 strip_off_ending (name, strlen (name));
2300 aux_base_name = name;
2303 aux_base_name = "gccaux";
2305 /* Set up the align_*_log variables, defaulting them to 1 if they
2306 were still unset. */
2307 if (align_loops <= 0) align_loops = 1;
2308 if (align_loops_max_skip > align_loops || !align_loops)
2309 align_loops_max_skip = align_loops - 1;
2310 align_loops_log = floor_log2 (align_loops * 2 - 1);
2311 if (align_jumps <= 0) align_jumps = 1;
2312 if (align_jumps_max_skip > align_jumps || !align_jumps)
2313 align_jumps_max_skip = align_jumps - 1;
2314 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
2315 if (align_labels <= 0) align_labels = 1;
2316 align_labels_log = floor_log2 (align_labels * 2 - 1);
2317 if (align_labels_max_skip > align_labels || !align_labels)
2318 align_labels_max_skip = align_labels - 1;
2319 if (align_functions <= 0) align_functions = 1;
2320 align_functions_log = floor_log2 (align_functions * 2 - 1);
2322 /* Unrolling all loops implies that standard loop unrolling must also
2324 if (flag_unroll_all_loops)
2325 flag_unroll_loops = 1;
2327 if (flag_unroll_loops)
2329 flag_old_unroll_loops = 0;
2330 flag_old_unroll_all_loops = 0;
2333 if (flag_old_unroll_all_loops)
2334 flag_old_unroll_loops = 1;
2336 /* Old loop unrolling requires that strength_reduction be on also. Silently
2337 turn on strength reduction here if it isn't already on. Also, the loop
2338 unrolling code assumes that cse will be run after loop, so that must
2339 be turned on also. */
2340 if (flag_old_unroll_loops)
2342 flag_strength_reduce = 1;
2343 flag_rerun_cse_after_loop = 1;
2345 if (flag_unroll_loops || flag_peel_loops)
2346 flag_rerun_cse_after_loop = 1;
2348 if (flag_non_call_exceptions)
2349 flag_asynchronous_unwind_tables = 1;
2350 if (flag_asynchronous_unwind_tables)
2351 flag_unwind_tables = 1;
2353 /* Disable unit-at-a-time mode for frontends not supporting callgraph
2355 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
2356 flag_unit_at_a_time = 0;
2358 if (flag_value_profile_transformations)
2359 flag_profile_values = 1;
2361 /* Warn about options that are not supported on this machine. */
2362 #ifndef INSN_SCHEDULING
2363 if (flag_schedule_insns || flag_schedule_insns_after_reload)
2364 warning ("instruction scheduling not supported on this target machine");
2367 if (flag_delayed_branch)
2368 warning ("this target machine does not have delayed branches");
2371 if (flag_tree_based_profiling && flag_test_coverage)
2372 sorry ("test-coverage not yet implemented in trees.");
2373 if (flag_tree_based_profiling && flag_profile_values)
2374 sorry ("value-based profiling not yet implemented in trees.");
2376 user_label_prefix = USER_LABEL_PREFIX;
2377 if (flag_leading_underscore != -1)
2379 /* If the default prefix is more complicated than "" or "_",
2380 issue a warning and ignore this option. */
2381 if (user_label_prefix[0] == 0 ||
2382 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
2384 user_label_prefix = flag_leading_underscore ? "_" : "";
2387 warning ("-f%sleading-underscore not supported on this target machine",
2388 flag_leading_underscore ? "" : "no-");
2391 /* If we are in verbose mode, write out the version and maybe all the
2392 option flags in use. */
2395 print_version (stderr, "");
2397 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
2400 if (flag_syntax_only)
2402 write_symbols = NO_DEBUG;
2406 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
2408 if (debug_info_level == DINFO_LEVEL_NONE)
2409 write_symbols = NO_DEBUG;
2411 /* Now we know write_symbols, set up the debug hooks based on it.
2412 By default we do nothing for debug output. */
2413 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
2414 default_debug_hooks = &do_nothing_debug_hooks;
2415 #if defined(DBX_DEBUGGING_INFO)
2416 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
2417 default_debug_hooks = &dbx_debug_hooks;
2419 #if defined(XCOFF_DEBUGGING_INFO)
2420 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
2421 default_debug_hooks = &xcoff_debug_hooks;
2423 #ifdef SDB_DEBUGGING_INFO
2424 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
2425 default_debug_hooks = &sdb_debug_hooks;
2427 #ifdef DWARF2_DEBUGGING_INFO
2428 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
2429 default_debug_hooks = &dwarf2_debug_hooks;
2431 #ifdef VMS_DEBUGGING_INFO
2432 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
2433 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
2434 default_debug_hooks = &vmsdbg_debug_hooks;
2437 if (write_symbols == NO_DEBUG)
2438 debug_hooks = &do_nothing_debug_hooks;
2439 #if defined(DBX_DEBUGGING_INFO)
2440 else if (write_symbols == DBX_DEBUG)
2441 debug_hooks = &dbx_debug_hooks;
2443 #if defined(XCOFF_DEBUGGING_INFO)
2444 else if (write_symbols == XCOFF_DEBUG)
2445 debug_hooks = &xcoff_debug_hooks;
2447 #ifdef SDB_DEBUGGING_INFO
2448 else if (write_symbols == SDB_DEBUG)
2449 debug_hooks = &sdb_debug_hooks;
2451 #ifdef DWARF2_DEBUGGING_INFO
2452 else if (write_symbols == DWARF2_DEBUG)
2453 debug_hooks = &dwarf2_debug_hooks;
2455 #ifdef VMS_DEBUGGING_INFO
2456 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
2457 debug_hooks = &vmsdbg_debug_hooks;
2460 error ("target system does not support the \"%s\" debug format",
2461 debug_type_names[write_symbols]);
2463 /* Now we know which debug output will be used so we can set
2464 flag_var_tracking, flag_rename_registers and flag_web if the user has
2465 not specified them. */
2466 if (debug_info_level < DINFO_LEVEL_NORMAL
2467 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
2469 if (flag_var_tracking == 1)
2471 if (debug_info_level < DINFO_LEVEL_NORMAL)
2472 warning ("variable tracking requested, but useless unless "
2473 "producing debug info");
2475 warning ("variable tracking requested, but not supported "
2476 "by this debug format");
2478 flag_var_tracking = 0;
2481 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
2482 flag_rename_registers = default_debug_hooks->var_location
2483 != do_nothing_debug_hooks.var_location;
2485 if (flag_web == AUTODETECT_FLAG_VAR_TRACKING)
2486 flag_web = optimize >= 2 && (default_debug_hooks->var_location
2487 != do_nothing_debug_hooks.var_location);
2489 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
2490 flag_var_tracking = optimize >= 1;
2492 /* If auxiliary info generation is desired, open the output file.
2493 This goes in the same directory as the source file--unlike
2494 all the other output files. */
2495 if (flag_gen_aux_info)
2497 aux_info_file = fopen (aux_info_file_name, "w");
2498 if (aux_info_file == 0)
2499 fatal_error ("can't open %s: %m", aux_info_file_name);
2502 if (! targetm.have_named_sections)
2504 if (flag_function_sections)
2506 warning ("-ffunction-sections not supported for this target");
2507 flag_function_sections = 0;
2509 if (flag_data_sections)
2511 warning ("-fdata-sections not supported for this target");
2512 flag_data_sections = 0;
2516 if (flag_function_sections && profile_flag)
2518 warning ("-ffunction-sections disabled; it makes profiling impossible");
2519 flag_function_sections = 0;
2522 #ifndef HAVE_prefetch
2523 if (flag_prefetch_loop_arrays)
2525 warning ("-fprefetch-loop-arrays not supported for this target");
2526 flag_prefetch_loop_arrays = 0;
2529 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
2531 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
2532 flag_prefetch_loop_arrays = 0;
2536 /* This combination of options isn't handled for i386 targets and doesn't
2537 make much sense anyway, so don't allow it. */
2538 if (flag_prefetch_loop_arrays && optimize_size)
2540 warning ("-fprefetch-loop-arrays is not supported with -Os");
2541 flag_prefetch_loop_arrays = 0;
2544 #ifndef OBJECT_FORMAT_ELF
2545 if (flag_function_sections && write_symbols != NO_DEBUG)
2546 warning ("-ffunction-sections may affect debugging on some targets");
2549 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2550 if (flag_signaling_nans)
2551 flag_trapping_math = 1;
2554 /* Initialize the compiler back end. */
2558 init_adjust_machine_modes ();
2560 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2561 || debug_info_level == DINFO_LEVEL_VERBOSE
2562 #ifdef VMS_DEBUGGING_INFO
2563 /* Enable line number info for traceback. */
2564 || debug_info_level > DINFO_LEVEL_NONE
2566 || flag_test_coverage
2567 || warn_notreached);
2570 init_fake_stack_mems ();
2574 init_function_once ();
2575 init_varasm_once ();
2577 /* The following initialization functions need to generate rtl, so
2578 provide a dummy function context for them. */
2579 init_dummy_function_start ();
2581 if (flag_caller_saves)
2582 init_caller_save ();
2583 expand_dummy_function_end ();
2586 /* Language-dependent initialization. Returns nonzero on success. */
2588 lang_dependent_init (const char *name)
2590 if (dump_base_name == 0)
2591 dump_base_name = name ? name : "gccdump";
2593 /* Other front-end initialization. */
2594 if (lang_hooks.init () == 0)
2597 init_asm_output (name);
2599 /* These create various _DECL nodes, so need to be called after the
2600 front end is initialized. */
2603 init_optimization_passes ();
2605 /* The following initialization functions need to generate rtl, so
2606 provide a dummy function context for them. */
2607 init_dummy_function_start ();
2609 expand_dummy_function_end ();
2611 /* If dbx symbol table desired, initialize writing it and output the
2612 predefined types. */
2613 timevar_push (TV_SYMOUT);
2615 #ifdef DWARF2_UNWIND_INFO
2616 if (dwarf2out_do_frame ())
2617 dwarf2out_frame_init ();
2620 /* Now we have the correct original filename, we can initialize
2622 (*debug_hooks->init) (name);
2624 timevar_pop (TV_SYMOUT);
2629 /* Clean up: close opened files, etc. */
2634 /* Close the dump files. */
2635 if (flag_gen_aux_info)
2637 fclose (aux_info_file);
2639 unlink (aux_info_file_name);
2642 /* Close non-debugging input and output files. Take special care to note
2643 whether fclose returns an error, since the pages might still be on the
2644 buffer chain while the file is open. */
2648 if (ferror (asm_out_file) != 0)
2649 fatal_error ("error writing to %s: %m", asm_file_name);
2650 if (fclose (asm_out_file) != 0)
2651 fatal_error ("error closing %s: %m", asm_file_name);
2654 finish_optimization_passes ();
2658 ggc_print_statistics ();
2659 stringpool_statistics ();
2660 dump_tree_statistics ();
2661 dump_rtx_statistics ();
2662 dump_varray_statistics ();
2663 dump_alloc_pool_statistics ();
2664 dump_ggc_loc_statistics ();
2667 /* Free up memory for the benefit of leak detectors. */
2670 /* Language-specific end of compilation actions. */
2671 lang_hooks.finish ();
2674 /* Initialize the compiler, and compile the input file. */
2678 /* Initialize timing first. The C front ends read the main file in
2679 the post_options hook, and C++ does file timings. */
2680 if (time_report || !quiet_flag || flag_detailed_statistics)
2682 timevar_start (TV_TOTAL);
2686 /* Don't do any more if an error has already occurred. */
2689 /* Set up the back-end if requested. */
2693 /* Language-dependent initialization. Returns true on success. */
2694 if (lang_dependent_init (main_input_filename))
2700 /* Stop timing and print the times. */
2701 timevar_stop (TV_TOTAL);
2702 timevar_print (stderr);
2705 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2706 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2707 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2709 It is not safe to call this function more than once. */
2712 toplev_main (unsigned int argc, const char **argv)
2716 /* Initialization of GCC's environment, and diagnostics. */
2717 general_init (argv[0]);
2719 /* Parse the options and do minimal processing; basically just
2720 enough to default flags appropriately. */
2721 decode_options (argc, argv);
2725 /* Exit early if we can (e.g. -help). */
2726 if (!exit_after_options)
2729 if (errorcount || sorrycount)
2730 return (FATAL_EXIT_CODE);
2732 return (SUCCESS_EXIT_CODE);