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 /* The following flag controls the module scheduling activation. */
711 int flag_modulo_sched = 0;
713 int flag_single_precision_constant;
715 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
716 by a cheaper branch on a count register. */
717 int flag_branch_on_count_reg = 1;
719 /* -finhibit-size-directive inhibits output of .size for ELF.
720 This is used only for compiling crtstuff.c,
721 and it may be extended to other effects
722 needed for crtstuff.c on other systems. */
723 int flag_inhibit_size_directive = 0;
725 /* -fverbose-asm causes extra commentary information to be produced in
726 the generated assembly code (to make it more readable). This option
727 is generally only of use to those who actually need to read the
728 generated assembly code (perhaps while debugging the compiler itself).
729 -fno-verbose-asm, the default, causes the extra information
730 to be omitted and is useful when comparing two assembler files. */
732 int flag_verbose_asm = 0;
734 /* -dA causes debug commentary information to be produced in
735 the generated assembly code (to make it more readable). This option
736 is generally only of use to those who actually need to read the
737 generated assembly code (perhaps while debugging the compiler itself).
738 Currently, this switch is only used by dwarfout.c; however, it is intended
739 to be a catchall for printing debug information in the assembler file. */
741 int flag_debug_asm = 0;
743 /* -dP causes the rtl to be emitted as a comment in assembly. */
745 int flag_dump_rtl_in_asm = 0;
747 /* Nonzero means put zero initialized data in the bss section. */
748 int flag_zero_initialized_in_bss = 1;
750 /* Tag all structures with __attribute__(packed). */
751 int flag_pack_struct = 0;
753 /* Emit code to check for stack overflow; also may cause large objects
754 to be allocated dynamically. */
755 int flag_stack_check;
757 /* When non-NULL, indicates that whenever space is allocated on the
758 stack, the resulting stack pointer must not pass this
759 address---that is, for stacks that grow downward, the stack pointer
760 must always be greater than or equal to this address; for stacks
761 that grow upward, the stack pointer must be less than this address.
762 At present, the rtx may be either a REG or a SYMBOL_REF, although
763 the support provided depends on the backend. */
766 /* 0 if pointer arguments may alias each other. True in C.
767 1 if pointer arguments may not alias each other but may alias
769 2 if pointer arguments may not alias each other and may not
770 alias global variables. True in Fortran.
771 This defaults to 0 for C. */
772 int flag_argument_noalias = 0;
774 /* Nonzero if we should do (language-dependent) alias analysis.
775 Typically, this analysis will assume that expressions of certain
776 types do not alias expressions of certain other types. Only used
777 if alias analysis (in general) is enabled. */
778 int flag_strict_aliasing = 0;
780 /* Instrument functions with calls at entry and exit, for profiling. */
781 int flag_instrument_function_entry_exit = 0;
783 /* Nonzero means ignore `#ident' directives. 0 means handle them.
784 On SVR4 targets, it also controls whether or not to emit a
785 string identifying the compiler. */
787 int flag_no_ident = 0;
789 /* This will perform a peephole pass before sched2. */
790 int flag_peephole2 = 0;
792 /* This will try to guess branch probabilities. */
793 int flag_guess_branch_prob = 0;
795 /* -fcheck-bounds causes gcc to generate array bounds checks.
796 For C, C++, ObjC: defaults to off.
797 For Java: defaults to on.
798 For Fortran: defaults to off. */
799 int flag_bounds_check = 0;
801 /* Mudflap bounds-checking transform. */
802 int flag_mudflap = 0;
803 int flag_mudflap_threads = 0;
804 int flag_mudflap_ignore_reads = 0;
806 /* This will attempt to merge constant section constants, if 1 only
807 string constants and constants from constant pool, if 2 also constant
809 int flag_merge_constants = 1;
811 /* If one, renumber instruction UIDs to reduce the number of
812 unused UIDs if there are a lot of instructions. If greater than
813 one, unconditionally renumber instruction UIDs. */
814 int flag_renumber_insns = 1;
816 /* If nonzero, use the graph coloring register allocator. */
817 int flag_new_regalloc = 0;
819 /* If nonzero, use tree-based instead of rtl-based profiling. */
820 int flag_tree_based_profiling = 0;
822 /* Enable SSA-GVN on trees. */
823 int flag_tree_gvn = 0;
825 /* Enable the SSA-PRE tree optimization. */
826 int flag_tree_pre = 0;
828 /* Enable points-to analysis on trees. */
829 enum pta_type flag_tree_points_to = PTA_NONE;
831 /* Enable SSA-CCP on trees. */
832 int flag_tree_ccp = 0;
834 /* Enable SSA-DCE on trees. */
835 int flag_tree_dce = 0;
837 /* Enable loop header copying on tree-ssa. */
838 int flag_tree_ch = 0;
840 /* Enable scalar replacement of aggregates. */
841 int flag_tree_sra = 0;
843 /* Enable SSA->normal pass memory location coalescing. */
844 int flag_tree_combine_temps = 0;
846 /* Enable SSA->normal pass expression replacement. */
847 int flag_tree_ter = 0;
849 /* Enable SSA->normal live range splitting. */
850 int flag_tree_live_range_split = 0;
852 /* Enable dominator optimizations. */
853 int flag_tree_dom = 0;
855 /* Enable copy rename optimization. */
856 int flag_tree_copyrename = 0;
858 /* Enable dead store elimination. */
859 int flag_tree_dse = 0;
861 /* Nonzero if we perform superblock formation. */
864 /* Nonzero if we perform whole unit at a time compilation. */
866 int flag_unit_at_a_time = 0;
868 /* Nonzero if we should track variables. When
869 flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according
870 to optimize, debug_info_level and debug_hooks in process_options (). */
871 int flag_var_tracking = AUTODETECT_FLAG_VAR_TRACKING;
873 /* Values of the -falign-* flags: how much to align labels in code.
874 0 means `use default', 1 means `don't align'.
875 For each variable, there is an _log variant which is the power
876 of two not less than the variable, for .align output. */
880 int align_loops_max_skip;
883 int align_jumps_max_skip;
885 int align_labels_log;
886 int align_labels_max_skip;
888 int align_functions_log;
890 /* Like align_functions_log above, but used by front-ends to force the
891 minimum function alignment. Zero means no alignment is forced. */
892 int force_align_functions_log;
896 const char *const string;
900 lang_independent_options;
902 /* Nonzero if signed arithmetic overflow should trap. */
905 /* Nonzero if signed arithmetic overflow should wrap around. */
908 /* Nonzero if subexpressions must be evaluated from left-to-right. */
909 int flag_evaluation_order = 0;
911 /* Add or remove a leading underscore from user symbols. */
912 int flag_leading_underscore = -1;
914 /* The version of the C++ ABI in use. The following values are
917 0: The version of the ABI believed most conformant with the
918 C++ ABI specification. This ABI may change as bugs are
919 discovered and fixed. Therefore, 0 will not necessarily
920 indicate the same ABI in different versions of G++.
922 1: The version of the ABI first used in G++ 3.2.
924 2: The version of the ABI first used in G++ 3.4.
926 Additional positive integers will be assigned as new versions of
927 the ABI become the default version of the ABI. */
929 int flag_abi_version = 2;
931 /* The user symbol prefix after having resolved same. */
932 const char *user_label_prefix;
934 static const param_info lang_independent_params[] = {
935 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
936 { OPTION, DEFAULT, HELP },
937 #include "params.def"
942 /* Table of language-independent -f options.
943 STRING is the option name. VARIABLE is the address of the variable.
944 ON_VALUE is the value to store in VARIABLE
945 if `-fSTRING' is seen as an option.
946 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
948 static const lang_independent_options f_options[] =
950 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1 },
951 {"eliminate-unused-debug-symbols", &flag_debug_only_used_symbols, 1 },
952 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1 },
953 {"float-store", &flag_float_store, 1 },
954 {"defer-pop", &flag_defer_pop, 1 },
955 {"omit-frame-pointer", &flag_omit_frame_pointer, 1 },
956 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1 },
957 {"tracer", &flag_tracer, 1 },
958 {"unit-at-a-time", &flag_unit_at_a_time, 1 },
959 {"cse-follow-jumps", &flag_cse_follow_jumps, 1 },
960 {"cse-skip-blocks", &flag_cse_skip_blocks, 1 },
961 {"expensive-optimizations", &flag_expensive_optimizations, 1 },
962 {"thread-jumps", &flag_thread_jumps, 1 },
963 {"strength-reduce", &flag_strength_reduce, 1 },
964 {"unroll-loops", &flag_unroll_loops, 1 },
965 {"unroll-all-loops", &flag_unroll_all_loops, 1 },
966 {"old-unroll-loops", &flag_old_unroll_loops, 1 },
967 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1 },
968 {"peel-loops", &flag_peel_loops, 1 },
969 {"unswitch-loops", &flag_unswitch_loops, 1 },
970 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1 },
971 {"move-all-movables", &flag_move_all_movables, 1 },
972 {"reduce-all-givs", &flag_reduce_all_givs, 1 },
973 {"peephole", &flag_no_peephole, 0 },
974 {"force-mem", &flag_force_mem, 1 },
975 {"force-addr", &flag_force_addr, 1 },
976 {"function-cse", &flag_no_function_cse, 0 },
977 {"inline-functions", &flag_inline_functions, 1 },
978 {"keep-inline-functions", &flag_keep_inline_functions, 1 },
979 {"inline", &flag_no_inline, 0 },
980 {"keep-static-consts", &flag_keep_static_consts, 1 },
981 {"syntax-only", &flag_syntax_only, 1 },
982 {"shared-data", &flag_shared_data, 1 },
983 {"caller-saves", &flag_caller_saves, 1 },
984 {"pcc-struct-return", &flag_pcc_struct_return, 1 },
985 {"reg-struct-return", &flag_pcc_struct_return, 0 },
986 {"delayed-branch", &flag_delayed_branch, 1 },
987 {"web", &flag_web, 1},
988 {"gcse", &flag_gcse, 1 },
989 {"gcse-lm", &flag_gcse_lm, 1 },
990 {"gcse-sm", &flag_gcse_sm, 1 },
991 {"gcse-las", &flag_gcse_las, 1 },
992 {"gcse-after-reload", &flag_gcse_after_reload, 1},
993 {"branch-target-load-optimize", &flag_branch_target_load_optimize, 1 },
994 {"branch-target-load-optimize2", &flag_branch_target_load_optimize2, 1 },
995 {"btr-bb-exclusive", &flag_btr_bb_exclusive, 1 },
996 {"loop-optimize", &flag_loop_optimize, 1 },
997 {"crossjumping", &flag_crossjumping, 1 },
998 {"if-conversion", &flag_if_conversion, 1 },
999 {"if-conversion2", &flag_if_conversion2, 1 },
1000 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1 },
1001 {"rerun-loop-opt", &flag_rerun_loop_opt, 1 },
1002 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1 },
1003 {"schedule-insns", &flag_schedule_insns, 1 },
1004 {"schedule-insns2", &flag_schedule_insns_after_reload, 1 },
1005 {"sched-interblock",&flag_schedule_interblock, 1 },
1006 {"sched-spec",&flag_schedule_speculative, 1 },
1007 {"sched-spec-load",&flag_schedule_speculative_load, 1 },
1008 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1 },
1009 {"sched-stalled-insns", &flag_sched_stalled_insns, 0 },
1010 {"sched-stalled-insns-dep", &flag_sched_stalled_insns_dep, 1 },
1011 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1 },
1012 {"sched2-use-traces", &flag_sched2_use_traces, 1 },
1013 {"modulo-sched", &flag_modulo_sched, 1 },
1014 {"branch-count-reg",&flag_branch_on_count_reg, 1 },
1015 {"pic", &flag_pic, 1 },
1016 {"PIC", &flag_pic, 2 },
1017 {"pie", &flag_pie, 1 },
1018 {"PIE", &flag_pie, 2 },
1019 {"exceptions", &flag_exceptions, 1 },
1020 {"unwind-tables", &flag_unwind_tables, 1 },
1021 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1 },
1022 {"non-call-exceptions", &flag_non_call_exceptions, 1 },
1023 {"profile-arcs", &profile_arc_flag, 1 },
1024 {"profile-values", &flag_profile_values, 1 },
1025 {"vpt", &flag_value_profile_transformations, 1 },
1026 {"test-coverage", &flag_test_coverage, 1 },
1027 {"branch-probabilities", &flag_branch_probabilities, 1 },
1028 {"profile", &profile_flag, 1 },
1029 {"tree-based-profiling", &flag_tree_based_profiling, 1 },
1030 {"reorder-blocks", &flag_reorder_blocks, 1 },
1031 {"reorder-blocks-and-partition", &flag_reorder_blocks_and_partition, 1},
1032 {"reorder-functions", &flag_reorder_functions, 1 },
1033 {"rename-registers", &flag_rename_registers, 1 },
1034 {"cprop-registers", &flag_cprop_registers, 1 },
1035 {"common", &flag_no_common, 0 },
1036 {"inhibit-size-directive", &flag_inhibit_size_directive, 1 },
1037 {"function-sections", &flag_function_sections, 1 },
1038 {"data-sections", &flag_data_sections, 1 },
1039 {"verbose-asm", &flag_verbose_asm, 1 },
1040 {"regmove", &flag_regmove, 1 },
1041 {"optimize-register-move", &flag_regmove, 1 },
1042 {"pack-struct", &flag_pack_struct, 1 },
1043 {"stack-check", &flag_stack_check, 1 },
1044 {"argument-alias", &flag_argument_noalias, 0 },
1045 {"argument-noalias", &flag_argument_noalias, 1 },
1046 {"argument-noalias-global", &flag_argument_noalias, 2 },
1047 {"strict-aliasing", &flag_strict_aliasing, 1 },
1048 {"align-loops", &align_loops, 0 },
1049 {"align-jumps", &align_jumps, 0 },
1050 {"align-labels", &align_labels, 0 },
1051 {"align-functions", &align_functions, 0 },
1052 {"merge-constants", &flag_merge_constants, 1 },
1053 {"merge-all-constants", &flag_merge_constants, 2 },
1054 {"dump-unnumbered", &flag_dump_unnumbered, 1 },
1055 {"instrument-functions", &flag_instrument_function_entry_exit, 1 },
1056 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1 },
1057 {"leading-underscore", &flag_leading_underscore, 1 },
1058 {"ident", &flag_no_ident, 0 },
1059 { "peephole2", &flag_peephole2, 1 },
1060 {"finite-math-only", &flag_finite_math_only, 1 },
1061 { "guess-branch-probability", &flag_guess_branch_prob, 1 },
1062 {"math-errno", &flag_errno_math, 1 },
1063 {"trapping-math", &flag_trapping_math, 1 },
1064 {"rounding-math", &flag_rounding_math, 1 },
1065 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1 },
1066 {"signaling-nans", &flag_signaling_nans, 1 },
1067 {"bounds-check", &flag_bounds_check, 1 },
1068 {"single-precision-constant", &flag_single_precision_constant, 1 },
1069 {"time-report", &time_report, 1 },
1070 {"mem-report", &mem_report, 1 },
1071 { "trapv", &flag_trapv, 1 },
1072 { "wrapv", &flag_wrapv, 1 },
1073 { "new-ra", &flag_new_regalloc, 1 },
1074 { "var-tracking", &flag_var_tracking, 1},
1075 { "tree-gvn", &flag_tree_gvn, 1 },
1076 { "tree-pre", &flag_tree_pre, 1 },
1077 { "tree-ccp", &flag_tree_ccp, 1 },
1078 { "tree-dce", &flag_tree_dce, 1 },
1079 { "tree-dominator-opts", &flag_tree_dom, 1 },
1080 { "tree-copyrename", &flag_tree_copyrename, 1 },
1081 { "tree-dse", &flag_tree_dse, 1 },
1082 { "tree-combine-temps", &flag_tree_combine_temps, 1 },
1083 { "tree-ter", &flag_tree_ter, 1 },
1084 { "tree-lrs", &flag_tree_live_range_split, 1 },
1085 { "tree-ch", &flag_tree_ch, 1 }
1088 /* Here is a table, controlled by the tm.h file, listing each -m switch
1089 and which bits in `target_switches' it should set or clear.
1090 If VALUE is positive, it is bits to set.
1091 If VALUE is negative, -VALUE is bits to clear.
1092 (The sign bit is not used so there is no confusion.) */
1096 const char *const name;
1098 const char *const description;
1100 target_switches[] = TARGET_SWITCHES;
1102 /* This table is similar, but allows the switch to have a value. */
1104 #ifdef TARGET_OPTIONS
1107 const char *const prefix;
1108 const char **const variable;
1109 const char *const description;
1110 const char *const value;
1112 target_options[] = TARGET_OPTIONS;
1115 /* Nonzero means warn about function definitions that default the return type
1116 or that use a null return and have a return-type other than void. */
1118 int warn_return_type;
1120 /* Output files for assembler code (real compiler output)
1121 and debugging dumps. */
1124 FILE *aux_info_file;
1125 FILE *dump_file = NULL;
1126 FILE *cgraph_dump_file = NULL;
1128 /* The current working directory of a translation. It's generally the
1129 directory from which compilation was initiated, but a preprocessed
1130 file may specify the original directory in which it was
1133 static const char *src_pwd;
1135 /* Initialize src_pwd with the given string, and return true. If it
1136 was already initialized, return false. As a special case, it may
1137 be called with a NULL argument to test whether src_pwd has NOT been
1141 set_src_pwd (const char *pwd)
1145 if (strcmp (src_pwd, pwd) == 0)
1151 src_pwd = xstrdup (pwd);
1155 /* Return the directory from which the translation unit was initiated,
1156 in case set_src_pwd() was not called before to assign it a
1163 src_pwd = getpwd ();
1168 /* Called when the start of a function definition is parsed,
1169 this function prints on stderr the name of the function. */
1171 announce_function (tree decl)
1175 if (rtl_dump_and_exit)
1176 verbatim ("%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
1178 verbatim (" %s", lang_hooks.decl_printable_name (decl, 2));
1180 pp_needs_newline (global_dc->printer) = true;
1181 diagnostic_set_last_function (global_dc);
1185 /* Set up a default flag_random_seed and local_tick, unless the user
1186 already specified one. */
1191 if (!flag_random_seed)
1193 unsigned HOST_WIDE_INT value;
1194 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
1196 /* Get some more or less random data. */
1197 #ifdef HAVE_GETTIMEOFDAY
1201 gettimeofday (&tv, NULL);
1202 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
1206 time_t now = time (NULL);
1208 if (now != (time_t)-1)
1209 local_tick = (unsigned) now;
1212 value = local_tick ^ getpid ();
1214 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
1215 flag_random_seed = random_seed;
1217 else if (!local_tick)
1222 /* Decode the string P as an integral parameter.
1223 If the string is indeed an integer return its numeric value else
1224 issue an Invalid Option error for the option PNAME and return DEFVAL.
1225 If PNAME is zero just return DEFVAL, do not call error. */
1228 read_integral_parameter (const char *p, const char *pname, const int defval)
1230 const char *endp = p;
1234 if (ISDIGIT (*endp))
1243 error ("invalid option argument `%s'", pname);
1250 /* Return the logarithm of X, base 2, considering X unsigned,
1251 if X is a power of 2. Otherwise, returns -1.
1253 This should be used via the `exact_log2' macro. */
1256 exact_log2_wide (unsigned HOST_WIDE_INT x)
1259 /* Test for 0 or a power of 2. */
1260 if (x == 0 || x != (x & -x))
1262 while ((x >>= 1) != 0)
1267 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1268 If X is 0, return -1.
1270 This should be used via the floor_log2 macro. */
1273 floor_log2_wide (unsigned HOST_WIDE_INT x)
1282 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1283 into ICE messages, which is much more user friendly. In case the
1284 error printer crashes, reset the signal to prevent infinite recursion. */
1287 crash_signal (int signo)
1289 signal (signo, SIG_DFL);
1290 internal_error ("%s", strsignal (signo));
1293 /* Arrange to dump core on error. (The regular error message is still
1294 printed first, except in the case of abort().) */
1297 setup_core_dumping (void)
1300 signal (SIGABRT, SIG_DFL);
1302 #if defined(HAVE_SETRLIMIT)
1305 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1306 fatal_error ("getting core file size maximum limit: %m");
1307 rlim.rlim_cur = rlim.rlim_max;
1308 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1309 fatal_error ("setting core file size limit to maximum: %m");
1312 diagnostic_abort_on_error (global_dc);
1316 /* Strip off a legitimate source ending from the input string NAME of
1317 length LEN. Rather than having to know the names used by all of
1318 our front ends, we strip off an ending of a period followed by
1319 up to five characters. (Java uses ".class".) */
1322 strip_off_ending (char *name, int len)
1325 for (i = 2; i < 6 && len > i; i++)
1327 if (name[len - i] == '.')
1329 name[len - i] = '\0';
1335 /* Output a quoted string. */
1338 output_quoted_string (FILE *asm_file, const char *string)
1340 #ifdef OUTPUT_QUOTED_STRING
1341 OUTPUT_QUOTED_STRING (asm_file, string);
1345 putc ('\"', asm_file);
1346 while ((c = *string++) != 0)
1350 if (c == '\"' || c == '\\')
1351 putc ('\\', asm_file);
1355 fprintf (asm_file, "\\%03o", (unsigned char) c);
1357 putc ('\"', asm_file);
1361 /* Output a file name in the form wanted by System V. */
1364 output_file_directive (FILE *asm_file, const char *input_name)
1369 if (input_name == NULL)
1370 input_name = "<stdin>";
1372 len = strlen (input_name);
1373 na = input_name + len;
1375 /* NA gets INPUT_NAME sans directory names. */
1376 while (na > input_name)
1378 if (IS_DIR_SEPARATOR (na[-1]))
1383 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1384 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1386 fprintf (asm_file, "\t.file\t");
1387 output_quoted_string (asm_file, na);
1388 fputc ('\n', asm_file);
1392 /* Do any final processing required for the declarations in VEC, of
1393 which there are LEN. We write out inline functions and variables
1394 that have been deferred until this point, but which are required.
1395 Returns nonzero if anything was put out. */
1398 wrapup_global_declarations (tree *vec, int len)
1403 int output_something = 0;
1405 for (i = 0; i < len; i++)
1409 /* We're not deferring this any longer. Assignment is
1410 conditional to avoid needlessly dirtying PCH pages. */
1411 if (DECL_DEFER_OUTPUT (decl) != 0)
1412 DECL_DEFER_OUTPUT (decl) = 0;
1414 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1415 lang_hooks.finish_incomplete_decl (decl);
1418 /* Now emit any global variables or functions that we have been
1419 putting off. We need to loop in case one of the things emitted
1420 here references another one which comes earlier in the list. */
1424 for (i = 0; i < len; i++)
1428 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1431 /* Don't write out static consts, unless we still need them.
1433 We also keep static consts if not optimizing (for debugging),
1434 unless the user specified -fno-keep-static-consts.
1435 ??? They might be better written into the debug information.
1436 This is possible when using DWARF.
1438 A language processor that wants static constants to be always
1439 written out (even if it is not used) is responsible for
1440 calling rest_of_decl_compilation itself. E.g. the C front-end
1441 calls rest_of_decl_compilation from finish_decl.
1442 One motivation for this is that is conventional in some
1443 environments to write things like:
1444 static const char rcsid[] = "... version string ...";
1445 intending to force the string to be in the executable.
1447 A language processor that would prefer to have unneeded
1448 static constants "optimized away" would just defer writing
1449 them out until here. E.g. C++ does this, because static
1450 constants are often defined in header files.
1452 ??? A tempting alternative (for both C and C++) would be
1453 to force a constant to be written if and only if it is
1454 defined in a main file, as opposed to an include file. */
1456 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1460 if (flag_unit_at_a_time
1461 && cgraph_varpool_node (decl)->finalized)
1463 else if ((flag_unit_at_a_time && !cgraph_global_info_ready)
1464 && (TREE_USED (decl)
1465 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
1467 else if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1469 else if (DECL_COMDAT (decl))
1471 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1472 && (optimize || !flag_keep_static_consts
1473 || DECL_ARTIFICIAL (decl)))
1479 rest_of_decl_compilation (decl, NULL, 1, 1);
1485 output_something = 1;
1489 return output_something;
1492 /* Issue appropriate warnings for the global declarations in VEC (of
1493 which there are LEN). Output debugging information for them. */
1496 check_global_declarations (tree *vec, int len)
1501 for (i = 0; i < len; i++)
1505 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1506 && ! TREE_ASM_WRITTEN (decl))
1507 /* Cancel the RTL for this decl so that, if debugging info
1508 output for global variables is still to come,
1509 this one will be omitted. */
1510 SET_DECL_RTL (decl, NULL_RTX);
1512 /* Warn about any function
1513 declared static but not defined.
1514 We don't warn about variables,
1515 because many programs have static variables
1516 that exist only to get some text into the object file. */
1517 if (TREE_CODE (decl) == FUNCTION_DECL
1518 && (warn_unused_function
1519 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1520 && DECL_INITIAL (decl) == 0
1521 && DECL_EXTERNAL (decl)
1522 && ! DECL_ARTIFICIAL (decl)
1523 && ! TREE_PUBLIC (decl))
1525 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1526 pedwarn ("%J'%F' used but never defined", decl, decl);
1528 warning ("%J'%F' declared `static' but never defined", decl, decl);
1529 /* This symbol is effectively an "extern" declaration now. */
1530 TREE_PUBLIC (decl) = 1;
1531 assemble_external (decl);
1534 /* Warn about static fns or vars defined but not used. */
1535 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
1536 /* We don't warn about "static const" variables because the
1537 "rcs_id" idiom uses that construction. */
1538 || (warn_unused_variable
1539 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
1540 && ! DECL_IN_SYSTEM_HEADER (decl)
1541 && ! TREE_USED (decl)
1542 /* The TREE_USED bit for file-scope decls is kept in the identifier,
1543 to handle multiple external decls in different scopes. */
1544 && ! TREE_USED (DECL_NAME (decl))
1545 && ! DECL_EXTERNAL (decl)
1546 && ! TREE_PUBLIC (decl)
1547 /* A volatile variable might be used in some non-obvious way. */
1548 && ! TREE_THIS_VOLATILE (decl)
1549 /* Global register variables must be declared to reserve them. */
1550 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
1551 /* Otherwise, ask the language. */
1552 && lang_hooks.decls.warn_unused_global (decl))
1553 warning ("%J'%D' defined but not used", decl, decl);
1555 /* Avoid confusing the debug information machinery when there are
1557 if (errorcount == 0 && sorrycount == 0)
1559 timevar_push (TV_SYMOUT);
1560 (*debug_hooks->global_decl) (decl);
1561 timevar_pop (TV_SYMOUT);
1566 /* Warn about a use of an identifier which was marked deprecated. */
1568 warn_deprecated_use (tree node)
1570 if (node == 0 || !warn_deprecated_decl)
1574 warning ("`%s' is deprecated (declared at %s:%d)",
1575 IDENTIFIER_POINTER (DECL_NAME (node)),
1576 DECL_SOURCE_FILE (node), DECL_SOURCE_LINE (node));
1577 else if (TYPE_P (node))
1579 const char *what = NULL;
1580 tree decl = TYPE_STUB_DECL (node);
1582 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
1583 what = IDENTIFIER_POINTER (TYPE_NAME (node));
1584 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
1585 && DECL_NAME (TYPE_NAME (node)))
1586 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
1591 warning ("`%s' is deprecated (declared at %s:%d)", what,
1592 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1594 warning ("`%s' is deprecated", what);
1597 warning ("type is deprecated (declared at %s:%d)",
1598 DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl));
1600 warning ("type is deprecated");
1604 /* Save the current INPUT_LOCATION on the top entry in the
1605 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
1606 INPUT_LOCATION accordingly. */
1609 push_srcloc (const char *file, int line)
1611 struct file_stack *fs;
1613 fs = xmalloc (sizeof (struct file_stack));
1614 fs->location = input_location;
1615 fs->next = input_file_stack;
1616 input_filename = file;
1618 input_file_stack = fs;
1619 input_file_stack_tick++;
1622 /* Pop the top entry off the stack of presently open source files.
1623 Restore the INPUT_LOCATION from the new topmost entry on the
1629 struct file_stack *fs;
1631 fs = input_file_stack;
1632 input_location = fs->location;
1633 input_file_stack = fs->next;
1635 input_file_stack_tick++;
1638 /* Compile an entire translation unit. Write a file of assembly
1639 output and various debugging dumps. */
1644 /* Initialize yet another pass. */
1646 init_final (main_input_filename);
1647 coverage_init (aux_base_name);
1649 timevar_push (TV_PARSE);
1651 /* Call the parser, which parses the entire file (calling
1652 rest_of_compilation for each function). */
1653 lang_hooks.parse_file (set_yydebug);
1655 /* In case there were missing block closers,
1656 get us back to the global binding level. */
1657 lang_hooks.clear_binding_stack ();
1659 /* Compilation is now finished except for writing
1660 what's left of the symbol table output. */
1661 timevar_pop (TV_PARSE);
1663 if (flag_syntax_only)
1666 lang_hooks.decls.final_write_globals ();
1668 cgraph_varpool_assemble_pending_decls ();
1670 /* This must occur after the loop to output deferred functions.
1671 Else the coverage initializer would not be emitted if all the
1672 functions in this compilation unit were deferred. */
1675 /* Write out any pending weak symbol declarations. */
1679 /* Do dbx symbols. */
1680 timevar_push (TV_SYMOUT);
1682 #ifdef DWARF2_UNWIND_INFO
1683 if (dwarf2out_do_frame ())
1684 dwarf2out_frame_finish ();
1687 (*debug_hooks->finish) (main_input_filename);
1688 timevar_pop (TV_SYMOUT);
1690 /* Output some stuff at end of file if nec. */
1692 dw2_output_indirect_constants ();
1694 /* Attach a special .ident directive to the end of the file to identify
1695 the version of GCC which compiled this code. The format of the .ident
1696 string is patterned after the ones produced by native SVR4 compilers. */
1699 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
1700 IDENT_ASM_OP, version_string);
1703 /* This must be at the end. Some target ports emit end of file directives
1704 into the assembly file here, and hence we can not output anything to the
1705 assembly file after this point. */
1706 targetm.asm_out.file_end ();
1709 /* Display help for target options. */
1711 display_target_options (void)
1714 static bool displayed = false;
1716 /* Avoid double printing for --help --target-help. */
1722 if (ARRAY_SIZE (target_switches) > 1
1723 #ifdef TARGET_OPTIONS
1724 || ARRAY_SIZE (target_options) > 1
1732 printf (_("\nTarget specific options:\n"));
1734 for (i = ARRAY_SIZE (target_switches); i--;)
1736 const char *option = target_switches[i].name;
1737 const char *description = target_switches[i].description;
1739 if (option == NULL || *option == 0)
1741 else if (description == NULL)
1746 printf (_(" -m%-23s [undocumented]\n"), option);
1748 else if (*description != 0)
1749 doc += printf (" -m%-23s %s\n", option, _(description));
1752 #ifdef TARGET_OPTIONS
1753 for (i = ARRAY_SIZE (target_options); i--;)
1755 const char *option = target_options[i].prefix;
1756 const char *description = target_options[i].description;
1758 if (option == NULL || *option == 0)
1760 else if (description == NULL)
1765 printf (_(" -m%-23s [undocumented]\n"), option);
1767 else if (*description != 0)
1768 doc += printf (" -m%-23s %s\n", option, _(description));
1774 printf (_("\nThere are undocumented target specific options as well.\n"));
1776 printf (_(" They exist, but they are not documented.\n"));
1781 /* Parse a -d... command line switch. */
1784 decode_d_option (const char *arg)
1795 flag_print_asm_name = 1;
1798 flag_dump_rtl_in_asm = 1;
1799 flag_print_asm_name = 1;
1802 graph_dump_format = vcg;
1805 rtl_dump_and_exit = 1;
1810 case 'D': /* These are handled by the preprocessor. */
1814 setup_core_dumping();
1819 if (!enable_rtl_dump_file (c))
1820 warning ("unrecognized gcc debugging option: %c", c);
1825 /* Indexed by enum debug_info_type. */
1826 const char *const debug_type_names[] =
1828 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
1831 /* Decode -m switches. */
1832 /* Decode the switch -mNAME. */
1835 set_target_switch (const char *name)
1838 int valid_target_option = 0;
1840 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1841 if (!strcmp (target_switches[j].name, name))
1843 if (target_switches[j].value < 0)
1844 target_flags &= ~-target_switches[j].value;
1846 target_flags |= target_switches[j].value;
1849 if (target_switches[j].value < 0)
1850 target_flags_explicit |= -target_switches[j].value;
1852 target_flags_explicit |= target_switches[j].value;
1854 valid_target_option = 1;
1857 #ifdef TARGET_OPTIONS
1858 if (!valid_target_option)
1859 for (j = 0; j < ARRAY_SIZE (target_options); j++)
1861 int len = strlen (target_options[j].prefix);
1862 if (target_options[j].value)
1864 if (!strcmp (target_options[j].prefix, name))
1866 *target_options[j].variable = target_options[j].value;
1867 valid_target_option = 1;
1872 if (!strncmp (target_options[j].prefix, name, len))
1874 *target_options[j].variable = name + len;
1875 valid_target_option = 1;
1881 if (!valid_target_option)
1882 error ("invalid option `%s'", name);
1885 /* Print version information to FILE.
1886 Each line begins with INDENT (for the case where FILE is the
1887 assembler output file). */
1890 print_version (FILE *file, const char *indent)
1893 #define __VERSION__ "[?]"
1897 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
1899 "%s%s%s version %s (%s) compiled by CC.\n"
1901 , indent, *indent != 0 ? " " : "",
1902 lang_hooks.name, version_string, TARGET_NAME,
1903 indent, __VERSION__);
1904 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
1905 indent, *indent != 0 ? " " : "",
1906 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1909 /* Print an option value and return the adjusted position in the line.
1910 ??? We don't handle error returns from fprintf (disk full); presumably
1911 other code will catch a disk full though. */
1914 print_single_switch (FILE *file, int pos, int max,
1915 const char *indent, const char *sep, const char *term,
1916 const char *type, const char *name)
1918 /* The ultrix fprintf returns 0 on success, so compute the result we want
1919 here since we need it for the following test. */
1920 int len = strlen (sep) + strlen (type) + strlen (name);
1925 fprintf (file, "%s", term);
1930 fprintf (file, "%s", indent);
1931 pos = strlen (indent);
1933 fprintf (file, "%s%s%s", sep, type, name);
1938 /* Print active target switches to FILE.
1939 POS is the current cursor position and MAX is the size of a "line".
1940 Each line begins with INDENT and ends with TERM.
1941 Each switch is separated from the next by SEP. */
1944 print_switch_values (FILE *file, int pos, int max,
1945 const char *indent, const char *sep, const char *term)
1950 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1951 that it can be printed below. This helps reproducibility. */
1954 /* Print the options as passed. */
1955 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
1956 _("options passed: "), "");
1958 for (p = &save_argv[1]; *p != NULL; p++)
1962 if (strcmp (*p, "-o") == 0)
1968 if (strcmp (*p, "-quiet") == 0)
1970 if (strcmp (*p, "-version") == 0)
1975 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
1978 fprintf (file, "%s", term);
1980 /* Print the -f and -m options that have been enabled.
1981 We don't handle language specific options but printing argv
1984 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
1985 _("options enabled: "), "");
1987 for (j = 0; j < ARRAY_SIZE (f_options); j++)
1988 if (*f_options[j].variable == f_options[j].on_value)
1989 pos = print_single_switch (file, pos, max, indent, sep, term,
1990 "-f", f_options[j].string);
1992 /* Print target specific options. */
1994 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
1995 if (target_switches[j].name[0] != '\0'
1996 && target_switches[j].value > 0
1997 && ((target_switches[j].value & target_flags)
1998 == target_switches[j].value))
2000 pos = print_single_switch (file, pos, max, indent, sep, term,
2001 "-m", target_switches[j].name);
2004 #ifdef TARGET_OPTIONS
2005 for (j = 0; j < ARRAY_SIZE (target_options); j++)
2006 if (*target_options[j].variable != NULL)
2009 sprintf (prefix, "-m%s", target_options[j].prefix);
2010 pos = print_single_switch (file, pos, max, indent, sep, term,
2011 prefix, *target_options[j].variable);
2015 fprintf (file, "%s", term);
2018 /* Open assembly code output file. Do this even if -fsyntax-only is
2019 on, because then the driver will have provided the name of a
2020 temporary file or bit bucket for us. NAME is the file specified on
2021 the command line, possibly NULL. */
2023 init_asm_output (const char *name)
2025 if (name == NULL && asm_file_name == 0)
2026 asm_out_file = stdout;
2029 if (asm_file_name == 0)
2031 int len = strlen (dump_base_name);
2032 char *dumpname = xmalloc (len + 6);
2033 memcpy (dumpname, dump_base_name, len + 1);
2034 strip_off_ending (dumpname, len);
2035 strcat (dumpname, ".s");
2036 asm_file_name = dumpname;
2038 if (!strcmp (asm_file_name, "-"))
2039 asm_out_file = stdout;
2041 asm_out_file = fopen (asm_file_name, "w+");
2042 if (asm_out_file == 0)
2043 fatal_error ("can't open %s for writing: %m", asm_file_name);
2046 #ifdef IO_BUFFER_SIZE
2047 setvbuf (asm_out_file, xmalloc (IO_BUFFER_SIZE),
2048 _IOFBF, IO_BUFFER_SIZE);
2051 if (!flag_syntax_only)
2053 targetm.asm_out.file_start ();
2055 #ifdef ASM_COMMENT_START
2056 if (flag_verbose_asm)
2058 /* Print the list of options in effect. */
2059 print_version (asm_out_file, ASM_COMMENT_START);
2060 print_switch_values (asm_out_file, 0, MAX_LINE,
2061 ASM_COMMENT_START, " ", "\n");
2062 /* Add a blank line here so it appears in assembler output but not
2064 fprintf (asm_out_file, "\n");
2070 /* Default version of get_pch_validity.
2071 By default, every flag difference is fatal; that will be mostly right for
2072 most targets, but completely right for very few. */
2075 default_get_pch_validity (size_t *len)
2077 #ifdef TARGET_OPTIONS
2082 *len = sizeof (target_flags) + 2;
2083 #ifdef TARGET_OPTIONS
2084 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2087 if (*target_options[i].variable)
2088 *len += strlen (*target_options[i].variable);
2092 result = r = xmalloc (*len);
2096 memcpy (r, &target_flags, sizeof (target_flags));
2097 r += sizeof (target_flags);
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;
2115 /* Default version of pch_valid_p. */
2118 default_pch_valid_p (const void *data_p, size_t len)
2120 const char *data = (const char *)data_p;
2121 const char *flag_that_differs = NULL;
2124 /* -fpic and -fpie also usually make a PCH invalid. */
2125 if (data[0] != flag_pic)
2126 return _("created and used with different settings of -fpic");
2127 if (data[1] != flag_pie)
2128 return _("created and used with different settings of -fpie");
2131 /* Check target_flags. */
2132 if (memcmp (data, &target_flags, sizeof (target_flags)) != 0)
2134 for (i = 0; i < ARRAY_SIZE (target_switches); i++)
2139 memcpy (&tf, data, sizeof (target_flags));
2141 bits = target_switches[i].value;
2144 if ((target_flags & bits) != (tf & bits))
2146 flag_that_differs = target_switches[i].name;
2152 data += sizeof (target_flags);
2153 len -= sizeof (target_flags);
2155 /* Check string options. */
2156 #ifdef TARGET_OPTIONS
2157 for (i = 0; i < ARRAY_SIZE (target_options); i++)
2159 const char *str = *target_options[i].variable;
2163 l = strlen (str) + 1;
2164 if (len < l || memcmp (data, str, l) != 0)
2166 flag_that_differs = target_options[i].prefix;
2179 asprintf (&r, _("created and used with differing settings of `-m%s'"),
2182 return _("out of memory");
2187 /* Default tree printer. Handles declarations only. */
2189 default_tree_printer (pretty_printer * pp, text_info *text)
2191 switch (*text->format_spec)
2197 tree t = va_arg (*text->args_ptr, tree);
2198 const char *n = DECL_NAME (t)
2199 ? lang_hooks.decl_printable_name (t, 2)
2210 /* Initialization of the front end environment, before command line
2211 options are parsed. Signal handlers, internationalization etc.
2212 ARGV0 is main's argv[0]. */
2214 general_init (const char *argv0)
2218 p = argv0 + strlen (argv0);
2219 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
2223 xmalloc_set_program_name (progname);
2227 gcc_init_libintl ();
2229 /* Initialize the diagnostics reporting machinery, so option parsing
2230 can give warnings and errors. */
2231 diagnostic_initialize (global_dc);
2232 /* Set a default printer. Language specific initializations will
2233 override it later. */
2234 pp_format_decoder (global_dc->printer) = &default_tree_printer;
2236 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
2238 signal (SIGSEGV, crash_signal);
2241 signal (SIGILL, crash_signal);
2244 signal (SIGBUS, crash_signal);
2247 signal (SIGABRT, crash_signal);
2249 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
2250 signal (SIGIOT, crash_signal);
2253 signal (SIGFPE, crash_signal);
2256 /* Other host-specific signal setup. */
2257 (*host_hooks.extra_signals)();
2259 /* Initialize the garbage-collector, string pools and tree type hash
2263 linemap_init (&line_table);
2266 /* Initialize register usage now so switches may override. */
2269 /* Register the language-independent parameters. */
2270 add_params (lang_independent_params, LAST_PARAM);
2272 /* This must be done after add_params but before argument processing. */
2273 init_ggc_heuristics();
2274 init_tree_optimization_passes ();
2277 /* Process the options that have been parsed. */
2279 process_options (void)
2281 /* Allow the front end to perform consistency checks and do further
2282 initialization based on the command line options. This hook also
2283 sets the original filename if appropriate (e.g. foo.i -> foo.c)
2284 so we can correctly initialize debug output. */
2285 no_backend = lang_hooks.post_options (&main_input_filename);
2286 input_filename = main_input_filename;
2288 #ifdef OVERRIDE_OPTIONS
2289 /* Some machines may reject certain combinations of options. */
2293 if (flag_short_enums == 2)
2294 flag_short_enums = targetm.default_short_enums ();
2296 /* Set aux_base_name if not already set. */
2299 else if (main_input_filename)
2301 char *name = xstrdup (lbasename (main_input_filename));
2303 strip_off_ending (name, strlen (name));
2304 aux_base_name = name;
2307 aux_base_name = "gccaux";
2309 /* Set up the align_*_log variables, defaulting them to 1 if they
2310 were still unset. */
2311 if (align_loops <= 0) align_loops = 1;
2312 if (align_loops_max_skip > align_loops || !align_loops)
2313 align_loops_max_skip = align_loops - 1;
2314 align_loops_log = floor_log2 (align_loops * 2 - 1);
2315 if (align_jumps <= 0) align_jumps = 1;
2316 if (align_jumps_max_skip > align_jumps || !align_jumps)
2317 align_jumps_max_skip = align_jumps - 1;
2318 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
2319 if (align_labels <= 0) align_labels = 1;
2320 align_labels_log = floor_log2 (align_labels * 2 - 1);
2321 if (align_labels_max_skip > align_labels || !align_labels)
2322 align_labels_max_skip = align_labels - 1;
2323 if (align_functions <= 0) align_functions = 1;
2324 align_functions_log = floor_log2 (align_functions * 2 - 1);
2326 /* Unrolling all loops implies that standard loop unrolling must also
2328 if (flag_unroll_all_loops)
2329 flag_unroll_loops = 1;
2331 if (flag_unroll_loops)
2333 flag_old_unroll_loops = 0;
2334 flag_old_unroll_all_loops = 0;
2337 if (flag_old_unroll_all_loops)
2338 flag_old_unroll_loops = 1;
2340 /* Old loop unrolling requires that strength_reduction be on also. Silently
2341 turn on strength reduction here if it isn't already on. Also, the loop
2342 unrolling code assumes that cse will be run after loop, so that must
2343 be turned on also. */
2344 if (flag_old_unroll_loops)
2346 flag_strength_reduce = 1;
2347 flag_rerun_cse_after_loop = 1;
2349 if (flag_unroll_loops || flag_peel_loops)
2350 flag_rerun_cse_after_loop = 1;
2352 if (flag_non_call_exceptions)
2353 flag_asynchronous_unwind_tables = 1;
2354 if (flag_asynchronous_unwind_tables)
2355 flag_unwind_tables = 1;
2357 /* Disable unit-at-a-time mode for frontends not supporting callgraph
2359 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
2360 flag_unit_at_a_time = 0;
2362 if (flag_value_profile_transformations)
2363 flag_profile_values = 1;
2365 /* Warn about options that are not supported on this machine. */
2366 #ifndef INSN_SCHEDULING
2367 if (flag_schedule_insns || flag_schedule_insns_after_reload)
2368 warning ("instruction scheduling not supported on this target machine");
2371 if (flag_delayed_branch)
2372 warning ("this target machine does not have delayed branches");
2375 if (flag_tree_based_profiling && flag_test_coverage)
2376 sorry ("test-coverage not yet implemented in trees.");
2377 if (flag_tree_based_profiling && flag_profile_values)
2378 sorry ("value-based profiling not yet implemented in trees.");
2380 user_label_prefix = USER_LABEL_PREFIX;
2381 if (flag_leading_underscore != -1)
2383 /* If the default prefix is more complicated than "" or "_",
2384 issue a warning and ignore this option. */
2385 if (user_label_prefix[0] == 0 ||
2386 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
2388 user_label_prefix = flag_leading_underscore ? "_" : "";
2391 warning ("-f%sleading-underscore not supported on this target machine",
2392 flag_leading_underscore ? "" : "no-");
2395 /* If we are in verbose mode, write out the version and maybe all the
2396 option flags in use. */
2399 print_version (stderr, "");
2401 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
2404 if (flag_syntax_only)
2406 write_symbols = NO_DEBUG;
2410 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
2412 if (debug_info_level == DINFO_LEVEL_NONE)
2413 write_symbols = NO_DEBUG;
2415 /* Now we know write_symbols, set up the debug hooks based on it.
2416 By default we do nothing for debug output. */
2417 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
2418 default_debug_hooks = &do_nothing_debug_hooks;
2419 #if defined(DBX_DEBUGGING_INFO)
2420 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
2421 default_debug_hooks = &dbx_debug_hooks;
2423 #if defined(XCOFF_DEBUGGING_INFO)
2424 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
2425 default_debug_hooks = &xcoff_debug_hooks;
2427 #ifdef SDB_DEBUGGING_INFO
2428 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
2429 default_debug_hooks = &sdb_debug_hooks;
2431 #ifdef DWARF2_DEBUGGING_INFO
2432 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
2433 default_debug_hooks = &dwarf2_debug_hooks;
2435 #ifdef VMS_DEBUGGING_INFO
2436 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
2437 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
2438 default_debug_hooks = &vmsdbg_debug_hooks;
2441 if (write_symbols == NO_DEBUG)
2442 debug_hooks = &do_nothing_debug_hooks;
2443 #if defined(DBX_DEBUGGING_INFO)
2444 else if (write_symbols == DBX_DEBUG)
2445 debug_hooks = &dbx_debug_hooks;
2447 #if defined(XCOFF_DEBUGGING_INFO)
2448 else if (write_symbols == XCOFF_DEBUG)
2449 debug_hooks = &xcoff_debug_hooks;
2451 #ifdef SDB_DEBUGGING_INFO
2452 else if (write_symbols == SDB_DEBUG)
2453 debug_hooks = &sdb_debug_hooks;
2455 #ifdef DWARF2_DEBUGGING_INFO
2456 else if (write_symbols == DWARF2_DEBUG)
2457 debug_hooks = &dwarf2_debug_hooks;
2459 #ifdef VMS_DEBUGGING_INFO
2460 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
2461 debug_hooks = &vmsdbg_debug_hooks;
2464 error ("target system does not support the \"%s\" debug format",
2465 debug_type_names[write_symbols]);
2467 /* Now we know which debug output will be used so we can set
2468 flag_var_tracking, flag_rename_registers and flag_web if the user has
2469 not specified them. */
2470 if (debug_info_level < DINFO_LEVEL_NORMAL
2471 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
2473 if (flag_var_tracking == 1)
2475 if (debug_info_level < DINFO_LEVEL_NORMAL)
2476 warning ("variable tracking requested, but useless unless "
2477 "producing debug info");
2479 warning ("variable tracking requested, but not supported "
2480 "by this debug format");
2482 flag_var_tracking = 0;
2485 if (flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING)
2486 flag_rename_registers = default_debug_hooks->var_location
2487 != do_nothing_debug_hooks.var_location;
2489 if (flag_web == AUTODETECT_FLAG_VAR_TRACKING)
2490 flag_web = optimize >= 2 && (default_debug_hooks->var_location
2491 != do_nothing_debug_hooks.var_location);
2493 if (flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING)
2494 flag_var_tracking = optimize >= 1;
2496 /* If auxiliary info generation is desired, open the output file.
2497 This goes in the same directory as the source file--unlike
2498 all the other output files. */
2499 if (flag_gen_aux_info)
2501 aux_info_file = fopen (aux_info_file_name, "w");
2502 if (aux_info_file == 0)
2503 fatal_error ("can't open %s: %m", aux_info_file_name);
2506 if (! targetm.have_named_sections)
2508 if (flag_function_sections)
2510 warning ("-ffunction-sections not supported for this target");
2511 flag_function_sections = 0;
2513 if (flag_data_sections)
2515 warning ("-fdata-sections not supported for this target");
2516 flag_data_sections = 0;
2520 if (flag_function_sections && profile_flag)
2522 warning ("-ffunction-sections disabled; it makes profiling impossible");
2523 flag_function_sections = 0;
2526 #ifndef HAVE_prefetch
2527 if (flag_prefetch_loop_arrays)
2529 warning ("-fprefetch-loop-arrays not supported for this target");
2530 flag_prefetch_loop_arrays = 0;
2533 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
2535 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
2536 flag_prefetch_loop_arrays = 0;
2540 /* This combination of options isn't handled for i386 targets and doesn't
2541 make much sense anyway, so don't allow it. */
2542 if (flag_prefetch_loop_arrays && optimize_size)
2544 warning ("-fprefetch-loop-arrays is not supported with -Os");
2545 flag_prefetch_loop_arrays = 0;
2548 #ifndef OBJECT_FORMAT_ELF
2549 if (flag_function_sections && write_symbols != NO_DEBUG)
2550 warning ("-ffunction-sections may affect debugging on some targets");
2553 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2554 if (flag_signaling_nans)
2555 flag_trapping_math = 1;
2558 /* Initialize the compiler back end. */
2562 init_adjust_machine_modes ();
2564 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2565 || debug_info_level == DINFO_LEVEL_VERBOSE
2566 #ifdef VMS_DEBUGGING_INFO
2567 /* Enable line number info for traceback. */
2568 || debug_info_level > DINFO_LEVEL_NONE
2570 || flag_test_coverage
2571 || warn_notreached);
2574 init_fake_stack_mems ();
2578 init_function_once ();
2579 init_varasm_once ();
2581 /* The following initialization functions need to generate rtl, so
2582 provide a dummy function context for them. */
2583 init_dummy_function_start ();
2585 if (flag_caller_saves)
2586 init_caller_save ();
2587 expand_dummy_function_end ();
2590 /* Language-dependent initialization. Returns nonzero on success. */
2592 lang_dependent_init (const char *name)
2594 if (dump_base_name == 0)
2595 dump_base_name = name ? name : "gccdump";
2597 /* Other front-end initialization. */
2598 if (lang_hooks.init () == 0)
2601 init_asm_output (name);
2603 /* These create various _DECL nodes, so need to be called after the
2604 front end is initialized. */
2607 init_optimization_passes ();
2609 /* The following initialization functions need to generate rtl, so
2610 provide a dummy function context for them. */
2611 init_dummy_function_start ();
2613 expand_dummy_function_end ();
2615 /* If dbx symbol table desired, initialize writing it and output the
2616 predefined types. */
2617 timevar_push (TV_SYMOUT);
2619 #ifdef DWARF2_UNWIND_INFO
2620 if (dwarf2out_do_frame ())
2621 dwarf2out_frame_init ();
2624 /* Now we have the correct original filename, we can initialize
2626 (*debug_hooks->init) (name);
2628 timevar_pop (TV_SYMOUT);
2633 /* Clean up: close opened files, etc. */
2638 /* Close the dump files. */
2639 if (flag_gen_aux_info)
2641 fclose (aux_info_file);
2643 unlink (aux_info_file_name);
2646 /* Close non-debugging input and output files. Take special care to note
2647 whether fclose returns an error, since the pages might still be on the
2648 buffer chain while the file is open. */
2652 if (ferror (asm_out_file) != 0)
2653 fatal_error ("error writing to %s: %m", asm_file_name);
2654 if (fclose (asm_out_file) != 0)
2655 fatal_error ("error closing %s: %m", asm_file_name);
2658 finish_optimization_passes ();
2662 ggc_print_statistics ();
2663 stringpool_statistics ();
2664 dump_tree_statistics ();
2665 dump_rtx_statistics ();
2666 dump_varray_statistics ();
2667 dump_alloc_pool_statistics ();
2668 dump_ggc_loc_statistics ();
2671 /* Free up memory for the benefit of leak detectors. */
2674 /* Language-specific end of compilation actions. */
2675 lang_hooks.finish ();
2678 /* Initialize the compiler, and compile the input file. */
2682 /* Initialize timing first. The C front ends read the main file in
2683 the post_options hook, and C++ does file timings. */
2684 if (time_report || !quiet_flag || flag_detailed_statistics)
2686 timevar_start (TV_TOTAL);
2690 /* Don't do any more if an error has already occurred. */
2693 /* Set up the back-end if requested. */
2697 /* Language-dependent initialization. Returns true on success. */
2698 if (lang_dependent_init (main_input_filename))
2704 /* Stop timing and print the times. */
2705 timevar_stop (TV_TOTAL);
2706 timevar_print (stderr);
2709 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2710 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2711 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2713 It is not safe to call this function more than once. */
2716 toplev_main (unsigned int argc, const char **argv)
2720 /* Initialization of GCC's environment, and diagnostics. */
2721 general_init (argv[0]);
2723 /* Parse the options and do minimal processing; basically just
2724 enough to default flags appropriately. */
2725 decode_options (argc, argv);
2729 /* Exit early if we can (e.g. -help). */
2730 if (!exit_after_options)
2733 if (errorcount || sorrycount)
2734 return (FATAL_EXIT_CODE);
2736 return (SUCCESS_EXIT_CODE);