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
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
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
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/>. */
25 #include "coretypes.h"
30 NO_DEBUG
, /* Write no debug info. */
31 DBX_DEBUG
, /* Write BSD .stabs for DBX (using dbxout.c). */
32 SDB_DEBUG
, /* Write COFF for (old) SDB (using sdbout.c). */
33 DWARF2_DEBUG
, /* Write Dwarf v2 debug info (using dwarf2out.c). */
34 XCOFF_DEBUG
, /* Write IBM/Xcoff debug info (using dbxout.c). */
35 VMS_DEBUG
, /* Write VMS debug info (using vmsdbgout.c). */
36 VMS_AND_DWARF2_DEBUG
/* Write VMS debug info (using vmsdbgout.c).
37 and DWARF v2 debug info (using dwarf2out.c). */
40 /* Specify which kind of debugging info to generate. */
41 extern enum debug_info_type write_symbols
;
43 /* Names of debug_info_type, for error messages. */
44 extern const char *const debug_type_names
[];
48 DINFO_LEVEL_NONE
, /* Write no debugging info. */
49 DINFO_LEVEL_TERSE
, /* Write minimal info to support tracebacks only. */
50 DINFO_LEVEL_NORMAL
, /* Write info for all declarations (and line table). */
51 DINFO_LEVEL_VERBOSE
/* Write normal info plus #define/#undef info. */
54 /* Specify how much debugging info to generate. */
55 extern enum debug_info_level debug_info_level
;
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.
60 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
63 a pointer. See opts.c for the implementation. */
67 DINFO_USAGE_DFN
, /* A struct definition. */
68 DINFO_USAGE_DIR_USE
, /* A direct use, such as the type of a variable. */
69 DINFO_USAGE_IND_USE
, /* An indirect use, such as through a pointer. */
70 DINFO_USAGE_NUM_ENUMS
/* The number of enumerators. */
73 extern bool should_emit_struct_debug (tree type_decl
, enum debug_info_usage
);
74 extern void set_struct_debug_option (const char *value
);
76 /* Nonzero means use GNU-only extensions in the generated symbolic
77 debugging information. */
78 extern bool use_gnu_debug_info_extensions
;
80 /* Enumerate visibility settings. This is deliberately ordered from most
81 to least visibility. */
82 #ifndef SYMBOL_VISIBILITY_DEFINED
83 #define SYMBOL_VISIBILITY_DEFINED
84 enum symbol_visibility
93 /* The default visibility for all symbols (unless overridden). */
94 extern enum symbol_visibility default_visibility
;
96 struct visibility_flags
98 unsigned inpragma
: 1; /* True when in #pragma GCC visibility. */
99 unsigned inlines_hidden
: 1; /* True when -finlineshidden in effect. */
102 /* Global visibility options. */
103 extern struct visibility_flags visibility_options
;
105 /* Nonzero means do optimizations. -opt. */
109 /* Nonzero means optimize for size. -Os. */
111 extern int optimize_size
;
113 /* Do print extra warnings (such as for uninitialized variables).
116 extern bool extra_warnings
;
118 /* Nonzero to warn about unused variables, functions et.al. Use
119 set_Wunused() to update the -Wunused-* flags that correspond to the
122 extern void set_Wunused (int setting
);
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. */
131 extern void set_Wstrict_aliasing (int onoff
);
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'. */
137 extern bool warn_larger_than
;
138 extern HOST_WIDE_INT larger_than_size
;
140 /* Nonzero means warn about constructs which might not be strict
143 extern int warn_strict_aliasing
;
145 /* Nonzero means warn about optimizations which rely on undefined
148 extern int warn_strict_overflow
;
150 /* Temporarily suppress certain warnings.
151 This is set while reading code from a system header file. */
153 extern int in_system_header
;
155 /* Nonzero for -dp: annotate the assembly with a comment describing the
156 pattern and alternative used. */
158 extern int flag_print_asm_name
;
160 /* Now the symbols that are set with `-f' switches. */
162 /* Nonzero means `char' should be signed. */
164 extern int flag_signed_char
;
166 /* Nonzero means give an enum type only as many bytes as it needs. A value
167 of 2 means it has not yet been initialized. */
169 extern int flag_short_enums
;
171 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
173 extern int flag_pcc_struct_return
;
175 /* 0 means straightforward implementation of complex divide acceptable.
176 1 means wide ranges of inputs must work for complex divide.
177 2 means C99-like requirements for complex multiply and divide. */
179 extern int flag_complex_method
;
181 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
182 not just because the tree inliner turned us off. */
184 extern int flag_really_no_inline
;
186 /* Nonzero if we are only using compiler to check syntax errors. */
188 extern int rtl_dump_and_exit
;
190 /* Nonzero means we should save auxiliary info into a .X file. */
192 extern int flag_gen_aux_info
;
194 /* Nonzero means suppress output of instruction numbers and line number
195 notes in debugging dumps. */
197 extern int flag_dump_unnumbered
;
199 /* Nonzero means change certain warnings into errors.
200 Usually these are warnings about failure to conform to some standard. */
202 extern int flag_pedantic_errors
;
204 /* Nonzero if we are compiling code for a shared library, zero for
207 extern int flag_shlib
;
209 /* -dA causes debug information to be produced in
210 the generated assembly code (to make it more readable). This option
211 is generally only of use to those who actually need to read the
212 generated assembly code (perhaps while debugging the compiler itself).
213 Currently, this switch is only used by dwarfout.c; however, it is intended
214 to be a catchall for printing debug information in the assembler file. */
216 extern int flag_debug_asm
;
218 /* Generate code for GNU or NeXT Objective-C runtime environment. */
220 extern int flag_next_runtime
;
222 extern int flag_dump_rtl_in_asm
;
224 /* Other basic status info about current function. */
226 /* Nonzero means current function must be given a frame pointer.
227 Set in stmt.c if anything is allocated on the stack there.
228 Set in reload1.c if anything is allocated on the stack there. */
230 extern int frame_pointer_needed
;
232 /* Nonzero if subexpressions must be evaluated from left-to-right. */
233 extern int flag_evaluation_order
;
235 /* Value of the -G xx switch, and whether it was passed or not. */
236 extern unsigned HOST_WIDE_INT g_switch_value
;
237 extern bool g_switch_set
;
239 /* Values of the -falign-* flags: how much to align labels in code.
240 0 means `use default', 1 means `don't align'.
241 For each variable, there is an _log variant which is the power
242 of two not less than the variable, for .align output. */
244 extern int align_loops_log
;
245 extern int align_loops_max_skip
;
246 extern int align_jumps_log
;
247 extern int align_jumps_max_skip
;
248 extern int align_labels_log
;
249 extern int align_labels_max_skip
;
250 extern int align_functions_log
;
252 /* Nonzero if we dump in VCG format, not plain text. */
253 extern int dump_for_graph
;
255 /* Selection of the graph form. */
256 enum graph_dump_types
261 extern enum graph_dump_types graph_dump_format
;
263 /* Nonzero means to collect statistics which might be expensive
264 and to print them when we are done. */
265 extern int flag_detailed_statistics
;
267 /* Nonzero means that we defer emitting functions until they are actually
269 extern int flag_remove_unreachable_functions
;
271 /* Nonzero if we should track variables. */
272 extern int flag_var_tracking
;
274 /* True if flag_speculative_prefetching was set by user. Used to suppress
275 warning message in case flag was set by -fprofile-{generate,use}. */
276 extern bool flag_speculative_prefetching_set
;
278 /* Returns TRUE if generated code should match ABI version N or
279 greater is in use. */
281 #define abi_version_at_least(N) \
282 (flag_abi_version == 0 || flag_abi_version >= (N))
284 /* True if the given mode has a NaN representation and the treatment of
285 NaN operands is important. Certain optimizations, such as folding
286 x * 0 into 0, are not correct for NaN operands, and are normally
287 disabled for modes with NaNs. The user can ask for them to be
288 done anyway using the -funsafe-math-optimizations switch. */
289 #define HONOR_NANS(MODE) \
290 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
292 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
293 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
295 /* As for HONOR_NANS, but true if the mode can represent infinity and
296 the treatment of infinite values is important. */
297 #define HONOR_INFINITIES(MODE) \
298 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
300 /* Like HONOR_NANS, but true if the given mode distinguishes between
301 positive and negative zero, and the sign of zero is important. */
302 #define HONOR_SIGNED_ZEROS(MODE) \
303 (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
305 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
306 and the rounding mode is important. */
307 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
308 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
310 /* True if overflow wraps around for the given integral type. That
311 is, TYPE_MAX + 1 == TYPE_MIN. */
312 #define TYPE_OVERFLOW_WRAPS(TYPE) \
313 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
315 /* True if overflow is undefined for the given integral type. We may
316 optimize on the assumption that values in the type never overflow.
318 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
319 must issue a warning based on warn_strict_overflow. In some cases
320 it will be appropriate to issue the warning immediately, and in
321 other cases it will be appropriate to simply set a flag and let the
322 caller decide whether a warning is appropriate or not. */
323 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
324 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
326 /* True if overflow for the given integral type should issue a
328 #define TYPE_OVERFLOW_TRAPS(TYPE) \
329 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
331 /* Names for the different levels of -Wstrict-overflow=N. The numeric
332 values here correspond to N. */
334 enum warn_strict_overflow_code
336 /* Overflow warning that should be issued with -Wall: a questionable
337 construct that is easy to avoid even when using macros. Example:
338 folding (x + CONSTANT > x) to 1. */
339 WARN_STRICT_OVERFLOW_ALL
= 1,
340 /* Overflow warning about folding a comparison to a constant because
341 of undefined signed overflow, other than cases covered by
342 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
343 (this is false when x == INT_MIN). */
344 WARN_STRICT_OVERFLOW_CONDITIONAL
= 2,
345 /* Overflow warning about changes to comparisons other than folding
346 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
347 WARN_STRICT_OVERFLOW_COMPARISON
= 3,
348 /* Overflow warnings not covered by the above cases. Example:
349 folding ((x * 10) / 5) to (x * 2). */
350 WARN_STRICT_OVERFLOW_MISC
= 4,
351 /* Overflow warnings about reducing magnitude of constants in
352 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
353 WARN_STRICT_OVERFLOW_MAGNITUDE
= 5
356 /* Whether to emit an overflow warning whose code is C. */
357 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
359 #endif /* ! GCC_FLAGS_H */