re PR testsuite/40567 (Revision 149002 caused many failures)
[official-gcc.git] / gcc / flags.h
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1 /* Compilation switch flag definitions for GCC.
2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
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.
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
16 for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 #ifndef GCC_FLAGS_H
23 #define GCC_FLAGS_H
25 #include "coretypes.h"
26 #include "options.h"
27 #include "real.h"
29 enum debug_info_type
31 NO_DEBUG, /* Write no debug info. */
32 DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */
33 SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */
34 DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */
35 XCOFF_DEBUG, /* Write IBM/Xcoff debug info (using dbxout.c). */
36 VMS_DEBUG, /* Write VMS debug info (using vmsdbgout.c). */
37 VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
38 and DWARF v2 debug info (using dwarf2out.c). */
41 /* Specify which kind of debugging info to generate. */
42 extern enum debug_info_type write_symbols;
44 /* Names of debug_info_type, for error messages. */
45 extern const char *const debug_type_names[];
47 enum debug_info_level
49 DINFO_LEVEL_NONE, /* Write no debugging info. */
50 DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */
51 DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */
52 DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */
55 /* Specify how much debugging info to generate. */
56 extern enum debug_info_level debug_info_level;
58 /* A major contribution to object and executable size is debug
59 information size. A major contribution to debug information
60 size is struct descriptions replicated in several object files.
61 The following function determines whether or not debug information
62 should be generated for a given struct. The indirect parameter
63 indicates that the struct is being handled indirectly, via
64 a pointer. See opts.c for the implementation. */
66 enum debug_info_usage
68 DINFO_USAGE_DFN, /* A struct definition. */
69 DINFO_USAGE_DIR_USE, /* A direct use, such as the type of a variable. */
70 DINFO_USAGE_IND_USE, /* An indirect use, such as through a pointer. */
71 DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
74 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
75 extern void set_struct_debug_option (const char *value);
77 /* Nonzero means use GNU-only extensions in the generated symbolic
78 debugging information. */
79 extern bool use_gnu_debug_info_extensions;
81 /* Enumerate visibility settings. This is deliberately ordered from most
82 to least visibility. */
83 #ifndef SYMBOL_VISIBILITY_DEFINED
84 #define SYMBOL_VISIBILITY_DEFINED
85 enum symbol_visibility
87 VISIBILITY_DEFAULT,
88 VISIBILITY_PROTECTED,
89 VISIBILITY_HIDDEN,
90 VISIBILITY_INTERNAL
92 #endif
94 /* The default visibility for all symbols (unless overridden). */
95 extern enum symbol_visibility default_visibility;
97 struct visibility_flags
99 unsigned inpragma : 1; /* True when in #pragma GCC visibility. */
100 unsigned inlines_hidden : 1; /* True when -finlineshidden in effect. */
103 /* Global visibility options. */
104 extern struct visibility_flags visibility_options;
106 /* Nonzero means do optimizations. -opt. */
108 extern int optimize;
110 /* Nonzero means optimize for size. -Os. */
112 extern int optimize_size;
114 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
115 The external way to set the default level is to use
116 -Wstrict-aliasing=level.
117 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
118 and 0 otherwise. After calling this function, wstrict_aliasing will be
119 set to the default value of -Wstrict_aliasing=level. */
121 extern void set_Wstrict_aliasing (int onoff);
123 /* Nonzero means warn about any objects definitions whose size is larger
124 than N bytes. Also want about function definitions whose returned
125 values are larger than N bytes. The value N is in `larger_than_size'. */
127 extern bool warn_larger_than;
128 extern HOST_WIDE_INT larger_than_size;
130 /* Nonzero means warn about any function whose frame size is larger
131 than N bytes. */
133 extern bool warn_frame_larger_than;
134 extern HOST_WIDE_INT frame_larger_than_size;
136 /* Nonzero for -dp: annotate the assembly with a comment describing the
137 pattern and alternative used. */
139 extern int flag_print_asm_name;
141 /* Now the symbols that are set with `-f' switches. */
143 /* Nonzero means `char' should be signed. */
145 extern int flag_signed_char;
147 /* Nonzero means give an enum type only as many bytes as it needs. A value
148 of 2 means it has not yet been initialized. */
150 extern int flag_short_enums;
152 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
154 extern int flag_pcc_struct_return;
156 /* 0 means straightforward implementation of complex divide acceptable.
157 1 means wide ranges of inputs must work for complex divide.
158 2 means C99-like requirements for complex multiply and divide. */
160 extern int flag_complex_method;
162 /* Nonzero if we are only using compiler to check syntax errors. */
164 extern int rtl_dump_and_exit;
166 /* Nonzero means we should save auxiliary info into a .X file. */
168 extern int flag_gen_aux_info;
170 /* Nonzero means suppress output of instruction numbers and line number
171 notes in debugging dumps. */
173 extern int flag_dump_unnumbered;
175 /* Nonzero means change certain warnings into errors.
176 Usually these are warnings about failure to conform to some standard. */
178 extern int flag_pedantic_errors;
180 /* Nonzero means make permerror produce warnings instead of errors. */
182 extern int flag_permissive;
184 /* Nonzero if we are compiling code for a shared library, zero for
185 executable. */
187 extern int flag_shlib;
189 /* -dA causes debug information to be produced in
190 the generated assembly code (to make it more readable). This option
191 is generally only of use to those who actually need to read the
192 generated assembly code (perhaps while debugging the compiler itself).
193 Currently, this switch is only used by dwarfout.c; however, it is intended
194 to be a catchall for printing debug information in the assembler file. */
196 extern int flag_debug_asm;
198 /* Generate code for GNU or NeXT Objective-C runtime environment. */
200 extern int flag_next_runtime;
202 extern int flag_dump_rtl_in_asm;
204 /* The algorithm used for the integrated register allocator (IRA). */
205 enum ira_algorithm
207 IRA_ALGORITHM_CB,
208 IRA_ALGORITHM_PRIORITY
211 extern enum ira_algorithm flag_ira_algorithm;
213 /* The regions used for the integrated register allocator (IRA). */
214 enum ira_region
216 IRA_REGION_ONE,
217 IRA_REGION_ALL,
218 IRA_REGION_MIXED
221 extern enum ira_region flag_ira_region;
223 extern unsigned int flag_ira_verbose;
225 /* The options for excess precision. */
226 enum excess_precision
228 EXCESS_PRECISION_DEFAULT,
229 EXCESS_PRECISION_FAST,
230 EXCESS_PRECISION_STANDARD
233 /* The excess precision specified on the command line, or defaulted by
234 the front end. */
235 extern enum excess_precision flag_excess_precision_cmdline;
237 /* The excess precision currently in effect. */
238 extern enum excess_precision flag_excess_precision;
241 /* Other basic status info about current function. */
243 /* Nonzero if subexpressions must be evaluated from left-to-right. */
244 extern int flag_evaluation_order;
246 /* Value of the -G xx switch, and whether it was passed or not. */
247 extern unsigned HOST_WIDE_INT g_switch_value;
248 extern bool g_switch_set;
250 /* Same for selective scheduling. */
251 extern bool sel_sched_switch_set;
253 /* Values of the -falign-* flags: how much to align labels in code.
254 0 means `use default', 1 means `don't align'.
255 For each variable, there is an _log variant which is the power
256 of two not less than the variable, for .align output. */
258 extern int align_loops_log;
259 extern int align_loops_max_skip;
260 extern int align_jumps_log;
261 extern int align_jumps_max_skip;
262 extern int align_labels_log;
263 extern int align_labels_max_skip;
264 extern int align_functions_log;
266 /* Nonzero if we dump in VCG format, not plain text. */
267 extern int dump_for_graph;
269 /* Selection of the graph form. */
270 enum graph_dump_types
272 no_graph = 0,
275 extern enum graph_dump_types graph_dump_format;
277 /* Nonzero means to collect statistics which might be expensive
278 and to print them when we are done. */
279 extern int flag_detailed_statistics;
281 /* Nonzero means that we defer emitting functions until they are actually
282 used. */
283 extern int flag_remove_unreachable_functions;
285 /* Nonzero if we should track variables. */
286 extern int flag_var_tracking;
288 /* True if flag_speculative_prefetching was set by user. Used to suppress
289 warning message in case flag was set by -fprofile-{generate,use}. */
290 extern bool flag_speculative_prefetching_set;
292 /* Type of stack check. */
293 enum stack_check_type
295 /* Do not check the stack. */
296 NO_STACK_CHECK = 0,
298 /* Check the stack generically, i.e. assume no specific support
299 from the target configuration files. */
300 GENERIC_STACK_CHECK,
302 /* Check the stack and rely on the target configuration files to
303 check the static frame of functions, i.e. use the generic
304 mechanism only for dynamic stack allocations. */
305 STATIC_BUILTIN_STACK_CHECK,
307 /* Check the stack and entirely rely on the target configuration
308 files, i.e. do not use the generic mechanism at all. */
309 FULL_BUILTIN_STACK_CHECK
311 extern enum stack_check_type flag_stack_check;
313 /* Returns TRUE if generated code should match ABI version N or
314 greater is in use. */
316 #define abi_version_at_least(N) \
317 (flag_abi_version == 0 || flag_abi_version >= (N))
319 /* Return whether the function should be excluded from
320 instrumentation. */
321 extern bool flag_instrument_functions_exclude_p (tree fndecl);
323 /* True if the given mode has a NaN representation and the treatment of
324 NaN operands is important. Certain optimizations, such as folding
325 x * 0 into 0, are not correct for NaN operands, and are normally
326 disabled for modes with NaNs. The user can ask for them to be
327 done anyway using the -funsafe-math-optimizations switch. */
328 #define HONOR_NANS(MODE) \
329 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
331 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
332 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
334 /* As for HONOR_NANS, but true if the mode can represent infinity and
335 the treatment of infinite values is important. */
336 #define HONOR_INFINITIES(MODE) \
337 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
339 /* Like HONOR_NANS, but true if the given mode distinguishes between
340 positive and negative zero, and the sign of zero is important. */
341 #define HONOR_SIGNED_ZEROS(MODE) \
342 (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
344 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
345 and the rounding mode is important. */
346 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
347 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
349 /* True if overflow wraps around for the given integral type. That
350 is, TYPE_MAX + 1 == TYPE_MIN. */
351 #define TYPE_OVERFLOW_WRAPS(TYPE) \
352 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
354 /* True if overflow is undefined for the given integral type. We may
355 optimize on the assumption that values in the type never overflow.
357 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
358 must issue a warning based on warn_strict_overflow. In some cases
359 it will be appropriate to issue the warning immediately, and in
360 other cases it will be appropriate to simply set a flag and let the
361 caller decide whether a warning is appropriate or not. */
362 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
363 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
365 /* True if overflow for the given integral type should issue a
366 trap. */
367 #define TYPE_OVERFLOW_TRAPS(TYPE) \
368 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
370 /* True if pointer types have undefined overflow. */
371 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
373 /* Names for the different levels of -Wstrict-overflow=N. The numeric
374 values here correspond to N. */
376 enum warn_strict_overflow_code
378 /* Overflow warning that should be issued with -Wall: a questionable
379 construct that is easy to avoid even when using macros. Example:
380 folding (x + CONSTANT > x) to 1. */
381 WARN_STRICT_OVERFLOW_ALL = 1,
382 /* Overflow warning about folding a comparison to a constant because
383 of undefined signed overflow, other than cases covered by
384 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
385 (this is false when x == INT_MIN). */
386 WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
387 /* Overflow warning about changes to comparisons other than folding
388 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
389 WARN_STRICT_OVERFLOW_COMPARISON = 3,
390 /* Overflow warnings not covered by the above cases. Example:
391 folding ((x * 10) / 5) to (x * 2). */
392 WARN_STRICT_OVERFLOW_MISC = 4,
393 /* Overflow warnings about reducing magnitude of constants in
394 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
395 WARN_STRICT_OVERFLOW_MAGNITUDE = 5
398 /* Whether to emit an overflow warning whose code is C. */
399 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
401 #endif /* ! GCC_FLAGS_H */