1/* Compilation switch flag definitions for GCC.
2   Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
3   2003, 2004, 2005
4   Free Software Foundation, Inc.
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 2, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING.  If not, write to the Free
20Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
2102110-1301, USA.  */
22
23#ifndef GCC_FLAGS_H
24#define GCC_FLAGS_H
25
26#include "options.h"
27
28enum debug_info_type
29{
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).  */
38};
39
40/* Specify which kind of debugging info to generate.  */
41extern enum debug_info_type write_symbols;
42
43/* Names of debug_info_type, for error messages.  */
44extern const char *const debug_type_names[];
45
46enum debug_info_level
47{
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.  */
52};
53
54/* Specify how much debugging info to generate.  */
55extern enum debug_info_level debug_info_level;
56
57/* Nonzero means use GNU-only extensions in the generated symbolic
58   debugging information.  */
59extern bool use_gnu_debug_info_extensions;
60
61/* Enumerate visibility settings.  */
62#ifndef SYMBOL_VISIBILITY_DEFINED
63#define SYMBOL_VISIBILITY_DEFINED
64enum symbol_visibility
65{
66  VISIBILITY_DEFAULT,
67  VISIBILITY_INTERNAL,
68  VISIBILITY_HIDDEN,
69  VISIBILITY_PROTECTED
70};
71#endif
72
73/* The default visibility for all symbols (unless overridden).  */
74extern enum symbol_visibility default_visibility;
75
76struct visibility_flags
77{
78  unsigned inpragma : 1;	/* True when in #pragma GCC visibility.  */
79  unsigned inlines_hidden : 1;	/* True when -finlineshidden in effect.  */
80};
81
82/* Global visibility options.  */
83extern struct visibility_flags visibility_options;
84
85/* Nonzero means do optimizations.  -opt.  */
86
87extern int optimize;
88
89/* Nonzero means optimize for size.  -Os.  */
90
91extern int optimize_size;
92
93/* Do print extra warnings (such as for uninitialized variables).
94   -W/-Wextra.  */
95
96extern bool extra_warnings;
97
98/* Nonzero to warn about unused variables, functions et.al.  Use
99   set_Wunused() to update the -Wunused-* flags that correspond to the
100   -Wunused option.  */
101
102extern void set_Wunused (int setting);
103
104/* Nonzero means warn about any objects definitions whose size is larger
105   than N bytes.  Also want about function definitions whose returned
106   values are larger than N bytes. The value N is in `larger_than_size'.  */
107
108extern bool warn_larger_than;
109extern HOST_WIDE_INT larger_than_size;
110
111/* Nonzero means warn about constructs which might not be strict
112   aliasing safe.  */
113
114extern int warn_strict_aliasing;
115
116/* Temporarily suppress certain warnings.
117   This is set while reading code from a system header file.  */
118
119extern int in_system_header;
120
121/* Nonzero for -dp: annotate the assembly with a comment describing the
122   pattern and alternative used.  */
123
124extern int flag_print_asm_name;
125
126/* Now the symbols that are set with `-f' switches.  */
127
128/* Nonzero means `char' should be signed.  */
129
130extern int flag_signed_char;
131
132/* Nonzero means give an enum type only as many bytes as it needs.  A value
133   of 2 means it has not yet been initialized.  */
134
135extern int flag_short_enums;
136
137/* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
138
139extern int flag_pcc_struct_return;
140
141/* 0 means straightforward implementation of complex divide acceptable.
142   1 means wide ranges of inputs must work for complex divide.
143   2 means C99-like requirements for complex multiply and divide.  */
144
145extern int flag_complex_method;
146
147/* Nonzero means that we don't want inlining by virtue of -fno-inline,
148   not just because the tree inliner turned us off.  */
149
150extern int flag_really_no_inline;
151
152/* Nonzero if we are only using compiler to check syntax errors.  */
153
154extern int rtl_dump_and_exit;
155
156/* Nonzero means we should save auxiliary info into a .X file.  */
157
158extern int flag_gen_aux_info;
159
160/* Nonzero means suppress output of instruction numbers and line number
161   notes in debugging dumps.  */
162
163extern int flag_dump_unnumbered;
164
165/* Nonzero means change certain warnings into errors.
166   Usually these are warnings about failure to conform to some standard.  */
167
168extern int flag_pedantic_errors;
169
170/* Nonzero if we are compiling code for a shared library, zero for
171   executable.  */
172
173extern int flag_shlib;
174
175/* -dA causes debug information to be produced in
176   the generated assembly code (to make it more readable).  This option
177   is generally only of use to those who actually need to read the
178   generated assembly code (perhaps while debugging the compiler itself).
179   Currently, this switch is only used by dwarfout.c; however, it is intended
180   to be a catchall for printing debug information in the assembler file.  */
181
182extern int flag_debug_asm;
183
184/* Generate code for GNU or NeXT Objective-C runtime environment.  */
185
186extern int flag_next_runtime;
187
188extern int flag_dump_rtl_in_asm;
189
190/* If one, renumber instruction UIDs to reduce the number of
191   unused UIDs if there are a lot of instructions.  If greater than
192   one, unconditionally renumber instruction UIDs.  */
193extern int flag_renumber_insns;
194
195/* Other basic status info about current function.  */
196
197/* Nonzero means current function must be given a frame pointer.
198   Set in stmt.c if anything is allocated on the stack there.
199   Set in reload1.c if anything is allocated on the stack there.  */
200
201extern int frame_pointer_needed;
202
203/* Nonzero if subexpressions must be evaluated from left-to-right.  */
204extern int flag_evaluation_order;
205
206/* Value of the -G xx switch, and whether it was passed or not.  */
207extern unsigned HOST_WIDE_INT g_switch_value;
208extern bool g_switch_set;
209
210/* Values of the -falign-* flags: how much to align labels in code.
211   0 means `use default', 1 means `don't align'.
212   For each variable, there is an _log variant which is the power
213   of two not less than the variable, for .align output.  */
214
215extern int align_loops_log;
216extern int align_loops_max_skip;
217extern int align_jumps_log;
218extern int align_jumps_max_skip;
219extern int align_labels_log;
220extern int align_labels_max_skip;
221extern int align_functions_log;
222
223/* Like align_functions_log above, but used by front-ends to force the
224   minimum function alignment.  Zero means no alignment is forced.  */
225extern int force_align_functions_log;
226
227/* Nonzero if we dump in VCG format, not plain text.  */
228extern int dump_for_graph;
229
230/* Selection of the graph form.  */
231enum graph_dump_types
232{
233  no_graph = 0,
234  vcg
235};
236extern enum graph_dump_types graph_dump_format;
237
238/* Nonzero means to collect statistics which might be expensive
239   and to print them when we are done.  */
240extern int flag_detailed_statistics;
241
242/* Nonzero means that we defer emitting functions until they are actually
243   used.  */
244extern int flag_remove_unreachable_functions;
245
246/* Nonzero if we should track variables.  */
247extern int flag_var_tracking;
248
249/* True if flag_speculative_prefetching was set by user.  Used to suppress
250   warning message in case flag was set by -fprofile-{generate,use}.  */
251extern bool flag_speculative_prefetching_set;
252
253/* A string that's used when a random name is required.  NULL means
254   to make it really random.  */
255
256extern const char *flag_random_seed;
257
258/* Returns TRUE if generated code should match ABI version N or
259   greater is in use.  */
260
261#define abi_version_at_least(N) \
262  (flag_abi_version == 0 || flag_abi_version >= (N))
263
264/* True if the given mode has a NaN representation and the treatment of
265   NaN operands is important.  Certain optimizations, such as folding
266   x * 0 into x, are not correct for NaN operands, and are normally
267   disabled for modes with NaNs.  The user can ask for them to be
268   done anyway using the -funsafe-math-optimizations switch.  */
269#define HONOR_NANS(MODE) \
270  (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
271
272/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
273#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
274
275/* As for HONOR_NANS, but true if the mode can represent infinity and
276   the treatment of infinite values is important.  */
277#define HONOR_INFINITIES(MODE) \
278  (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
279
280/* Like HONOR_NANS, but true if the given mode distinguishes between
281   positive and negative zero, and the sign of zero is important.  */
282#define HONOR_SIGNED_ZEROS(MODE) \
283  (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
284
285/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
286   and the rounding mode is important.  */
287#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
288  (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
289
290#endif /* ! GCC_FLAGS_H */
291