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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [flags.h] - Blame information for rev 280

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1 280 jeremybenn
/* Compilation switch flag definitions for GCC.
2
   Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
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   2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4
   Free Software Foundation, Inc.
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify it under
9
the terms of the GNU General Public License as published by the Free
10
Software Foundation; either version 3, or (at your option) any later
11
version.
12
 
13
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14
WARRANTY; without even the implied warranty of MERCHANTABILITY or
15
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
21
 
22
#ifndef GCC_FLAGS_H
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#define GCC_FLAGS_H
24
 
25
#include "coretypes.h"
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#include "options.h"
27
 
28
enum debug_info_type
29
{
30
  NO_DEBUG,         /* Write no debug info.  */
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  DBX_DEBUG,        /* Write BSD .stabs for DBX (using dbxout.c).  */
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  SDB_DEBUG,        /* Write COFF for (old) SDB (using sdbout.c).  */
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  DWARF2_DEBUG,     /* Write Dwarf v2 debug info (using dwarf2out.c).  */
34
  XCOFF_DEBUG,      /* Write IBM/Xcoff debug info (using dbxout.c).  */
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  VMS_DEBUG,        /* Write VMS debug info (using vmsdbgout.c).  */
36
  VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
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                          and DWARF v2 debug info (using dwarf2out.c).  */
38
};
39
 
40
/* Specify which kind of debugging info to generate.  */
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extern enum debug_info_type write_symbols;
42
 
43
/* Names of debug_info_type, for error messages.  */
44
extern const char *const debug_type_names[];
45
 
46
enum debug_info_level
47
{
48
  DINFO_LEVEL_NONE,     /* Write no debugging info.  */
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  DINFO_LEVEL_TERSE,    /* Write minimal info to support tracebacks only.  */
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  DINFO_LEVEL_NORMAL,   /* Write info for all declarations (and line table).  */
51
  DINFO_LEVEL_VERBOSE   /* Write normal info plus #define/#undef info.  */
52
};
53
 
54
/* Specify how much debugging info to generate.  */
55
extern enum debug_info_level debug_info_level;
56
 
57
/* A major contribution to object and executable size is debug
58
   information size.  A major contribution to debug information
59
   size is struct descriptions replicated in several object files.
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   The following function determines whether or not debug information
61
   should be generated for a given struct.  The indirect parameter
62
   indicates that the struct is being handled indirectly, via
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   a pointer.  See opts.c for the implementation. */
64
 
65
enum debug_info_usage
66
{
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  DINFO_USAGE_DFN,      /* A struct definition. */
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  DINFO_USAGE_DIR_USE,  /* A direct use, such as the type of a variable. */
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  DINFO_USAGE_IND_USE,  /* An indirect use, such as through a pointer. */
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  DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
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};
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73
extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
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extern void set_struct_debug_option (const char *value);
75
 
76
/* Nonzero means use GNU-only extensions in the generated symbolic
77
   debugging information.  */
78
extern bool use_gnu_debug_info_extensions;
79
 
80
/* Enumerate visibility settings.  This is deliberately ordered from most
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   to least visibility.  */
82
#ifndef SYMBOL_VISIBILITY_DEFINED
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#define SYMBOL_VISIBILITY_DEFINED
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enum symbol_visibility
85
{
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  VISIBILITY_DEFAULT,
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  VISIBILITY_PROTECTED,
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  VISIBILITY_HIDDEN,
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  VISIBILITY_INTERNAL
90
};
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#endif
92
 
93
/* The default visibility for all symbols (unless overridden).  */
94
extern enum symbol_visibility default_visibility;
95
 
96
struct visibility_flags
97
{
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  unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
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  unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
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};
101
 
102
/* Global visibility options.  */
103
extern struct visibility_flags visibility_options;
104
 
105
/* Nonzero means do optimizations.  -opt.  */
106
 
107
extern int optimize;
108
 
109
/* Nonzero means optimize for size.  -Os.  */
110
 
111
extern int optimize_size;
112
 
113
/* True if this is the LTO front end (lto1).  This is used to disable
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   gimple generation and lowering passes that are normally run on the
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   output of a front end.  These passes must be bypassed for lto since
116
   they have already been done before the gimple was written.  */
117
 
118
extern bool in_lto_p;
119
 
120
/* Nonzero if we should write GIMPLE bytecode for link-time optimization.  */
121
 
122
extern int flag_generate_lto;
123
 
124
/* Used to set the level of -Wstrict-aliasing, when no level is specified.
125
   The external way to set the default level is to use
126
   -Wstrict-aliasing=level.
127
   ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
128
   and 0 otherwise.  After calling this function, wstrict_aliasing will be
129
   set to the default value of -Wstrict_aliasing=level.  */
130
 
131
extern void set_Wstrict_aliasing (int onoff);
132
 
133
/* Nonzero means warn about any objects definitions whose size is larger
134
   than N bytes.  Also want about function definitions whose returned
135
   values are larger than N bytes. The value N is in `larger_than_size'.  */
136
 
137
extern bool warn_larger_than;
138
extern HOST_WIDE_INT larger_than_size;
139
 
140
/* Nonzero means warn about any function whose frame size is larger
141
   than N bytes. */
142
 
143
extern bool warn_frame_larger_than;
144
extern HOST_WIDE_INT frame_larger_than_size;
145
 
146
/* Nonzero for -dp: annotate the assembly with a comment describing the
147
   pattern and alternative used.  */
148
 
149
extern int flag_print_asm_name;
150
 
151
/* Now the symbols that are set with `-f' switches.  */
152
 
153
/* Nonzero means `char' should be signed.  */
154
 
155
extern int flag_signed_char;
156
 
157
/* Nonzero means give an enum type only as many bytes as it needs.  A value
158
   of 2 means it has not yet been initialized.  */
159
 
160
extern int flag_short_enums;
161
 
162
/* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
163
 
164
extern int flag_pcc_struct_return;
165
 
166
/* 0 means straightforward implementation of complex divide acceptable.
167
   1 means wide ranges of inputs must work for complex divide.
168
   2 means C99-like requirements for complex multiply and divide.  */
169
 
170
extern int flag_complex_method;
171
 
172
/* Nonzero if we are only using compiler to check syntax errors.  */
173
 
174
extern int rtl_dump_and_exit;
175
 
176
/* Nonzero means we should save auxiliary info into a .X file.  */
177
 
178
extern int flag_gen_aux_info;
179
 
180
/* Nonzero means suppress output of instruction numbers and line number
181
   notes in debugging dumps.  */
182
 
183
extern int flag_dump_unnumbered;
184
 
185
/* True if printing into -fdump-final-insns= dump.  */
186
 
187
extern bool final_insns_dump_p;
188
 
189
/* Nonzero means change certain warnings into errors.
190
   Usually these are warnings about failure to conform to some standard.  */
191
 
192
extern int flag_pedantic_errors;
193
 
194
/* Nonzero means make permerror produce warnings instead of errors.  */
195
 
196
extern int flag_permissive;
197
 
198
/* Nonzero if we are compiling code for a shared library, zero for
199
   executable.  */
200
 
201
extern int flag_shlib;
202
 
203
/* -dA causes debug information to be produced in
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   the generated assembly code (to make it more readable).  This option
205
   is generally only of use to those who actually need to read the
206
   generated assembly code (perhaps while debugging the compiler itself).
207
   Currently, this switch is only used by dwarfout.c; however, it is intended
208
   to be a catchall for printing debug information in the assembler file.  */
209
 
210
extern int flag_debug_asm;
211
 
212
/* Generate code for GNU or NeXT Objective-C runtime environment.  */
213
 
214
extern int flag_next_runtime;
215
 
216
extern int flag_dump_rtl_in_asm;
217
 
218
/* The algorithm used for the integrated register allocator (IRA).  */
219
enum ira_algorithm
220
{
221
  IRA_ALGORITHM_CB,
222
  IRA_ALGORITHM_PRIORITY
223
};
224
 
225
extern enum ira_algorithm flag_ira_algorithm;
226
 
227
/* The regions used for the integrated register allocator (IRA).  */
228
enum ira_region
229
{
230
  IRA_REGION_ONE,
231
  IRA_REGION_ALL,
232
  IRA_REGION_MIXED
233
};
234
 
235
extern enum ira_region flag_ira_region;
236
 
237
extern unsigned int flag_ira_verbose;
238
 
239
/* The options for excess precision.  */
240
enum excess_precision
241
{
242
  EXCESS_PRECISION_DEFAULT,
243
  EXCESS_PRECISION_FAST,
244
  EXCESS_PRECISION_STANDARD
245
};
246
 
247
/* The excess precision specified on the command line, or defaulted by
248
   the front end.  */
249
extern enum excess_precision flag_excess_precision_cmdline;
250
 
251
/* The excess precision currently in effect.  */
252
extern enum excess_precision flag_excess_precision;
253
 
254
 
255
/* Other basic status info about current function.  */
256
 
257
/* Nonzero if subexpressions must be evaluated from left-to-right.  */
258
extern int flag_evaluation_order;
259
 
260
/* Value of the -G xx switch, and whether it was passed or not.  */
261
extern unsigned HOST_WIDE_INT g_switch_value;
262
extern bool g_switch_set;
263
 
264
/* Same for selective scheduling.  */
265
extern bool sel_sched_switch_set;
266
 
267
/* Whether to run the warn_unused_result attribute pass.  */
268
extern bool flag_warn_unused_result;
269
 
270
/* Values of the -falign-* flags: how much to align labels in code.
271
 
272
   For each variable, there is an _log variant which is the power
273
   of two not less than the variable, for .align output.  */
274
 
275
extern int align_loops_log;
276
extern int align_loops_max_skip;
277
extern int align_jumps_log;
278
extern int align_jumps_max_skip;
279
extern int align_labels_log;
280
extern int align_labels_max_skip;
281
extern int align_functions_log;
282
 
283
/* Nonzero if we dump in VCG format, not plain text.  */
284
extern int dump_for_graph;
285
 
286
/* Selection of the graph form.  */
287
enum graph_dump_types
288
{
289
  no_graph = 0,
290
  vcg
291
};
292
extern enum graph_dump_types graph_dump_format;
293
 
294
/* Nonzero means to collect statistics which might be expensive
295
   and to print them when we are done.  */
296
extern int flag_detailed_statistics;
297
 
298
/* Nonzero means that we defer emitting functions until they are actually
299
   used.  */
300
extern int flag_remove_unreachable_functions;
301
 
302
/* Nonzero if we should track variables.  */
303
extern int flag_var_tracking;
304
 
305
/* True if flag_speculative_prefetching was set by user.  Used to suppress
306
   warning message in case flag was set by -fprofile-{generate,use}.  */
307
extern bool flag_speculative_prefetching_set;
308
 
309
/* Type of stack check.  */
310
enum stack_check_type
311
{
312
  /* Do not check the stack.  */
313
  NO_STACK_CHECK = 0,
314
 
315
  /* Check the stack generically, i.e. assume no specific support
316
     from the target configuration files.  */
317
  GENERIC_STACK_CHECK,
318
 
319
  /* Check the stack and rely on the target configuration files to
320
     check the static frame of functions, i.e. use the generic
321
     mechanism only for dynamic stack allocations.  */
322
  STATIC_BUILTIN_STACK_CHECK,
323
 
324
  /* Check the stack and entirely rely on the target configuration
325
     files, i.e. do not use the generic mechanism at all.  */
326
  FULL_BUILTIN_STACK_CHECK
327
};
328
extern enum stack_check_type flag_stack_check;
329
 
330
/* Returns TRUE if generated code should match ABI version N or
331
   greater is in use.  */
332
 
333
#define abi_version_at_least(N) \
334
  (flag_abi_version == 0 || flag_abi_version >= (N))
335
 
336
/* Return whether the function should be excluded from
337
   instrumentation.  */
338
extern bool flag_instrument_functions_exclude_p (tree fndecl);
339
 
340
/* True if overflow wraps around for the given integral type.  That
341
   is, TYPE_MAX + 1 == TYPE_MIN.  */
342
#define TYPE_OVERFLOW_WRAPS(TYPE) \
343
  (TYPE_UNSIGNED (TYPE) || flag_wrapv)
344
 
345
/* True if overflow is undefined for the given integral type.  We may
346
   optimize on the assumption that values in the type never overflow.
347
 
348
   IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
349
   must issue a warning based on warn_strict_overflow.  In some cases
350
   it will be appropriate to issue the warning immediately, and in
351
   other cases it will be appropriate to simply set a flag and let the
352
   caller decide whether a warning is appropriate or not.  */
353
#define TYPE_OVERFLOW_UNDEFINED(TYPE) \
354
  (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
355
 
356
/* True if overflow for the given integral type should issue a
357
   trap.  */
358
#define TYPE_OVERFLOW_TRAPS(TYPE) \
359
  (!TYPE_UNSIGNED (TYPE) && flag_trapv)
360
 
361
/* True if pointer types have undefined overflow.  */
362
#define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
363
 
364
/* Names for the different levels of -Wstrict-overflow=N.  The numeric
365
   values here correspond to N.  */
366
 
367
enum warn_strict_overflow_code
368
{
369
  /* Overflow warning that should be issued with -Wall: a questionable
370
     construct that is easy to avoid even when using macros.  Example:
371
     folding (x + CONSTANT > x) to 1.  */
372
  WARN_STRICT_OVERFLOW_ALL = 1,
373
  /* Overflow warning about folding a comparison to a constant because
374
     of undefined signed overflow, other than cases covered by
375
     WARN_STRICT_OVERFLOW_ALL.  Example: folding (abs (x) >= 0) to 1
376
     (this is false when x == INT_MIN).  */
377
  WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
378
  /* Overflow warning about changes to comparisons other than folding
379
     them to a constant.  Example: folding (x + 1 > 1) to (x > 0).  */
380
  WARN_STRICT_OVERFLOW_COMPARISON = 3,
381
  /* Overflow warnings not covered by the above cases.  Example:
382
     folding ((x * 10) / 5) to (x * 2).  */
383
  WARN_STRICT_OVERFLOW_MISC = 4,
384
  /* Overflow warnings about reducing magnitude of constants in
385
     comparison.  Example: folding (x + 2 > y) to (x + 1 >= y).  */
386
  WARN_STRICT_OVERFLOW_MAGNITUDE = 5
387
};
388
 
389
/* Whether to emit an overflow warning whose code is C.  */
390
#define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
391
 
392
#endif /* ! GCC_FLAGS_H */

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