gcc/flags.h

   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, 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
  16 for more details.
  17
  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/>.  */
  21
  22 #ifndef GCC_FLAGS_H
  23 #define GCC_FLAGS_H
  24
  25 #include "coretypes.h"
  26 #include "flag-types.h"
  27 #include "options.h"
  28
  29 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
  30
  31 /* Specify which kind of debugging info to generate.  */
  32 extern enum debug_info_type write_symbols;
  33
  34 /* Names of debug_info_type, for error messages.  */
  35 extern const char *const debug_type_names[];
  36
  37 /* Specify how much debugging info to generate.  */
  38 extern enum debug_info_level debug_info_level;
  39
  40 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
  41 extern void set_struct_debug_option (const char *value);
  42
  43 /* Nonzero means use GNU-only extensions in the generated symbolic
  44    debugging information.  */
  45 extern bool use_gnu_debug_info_extensions;
  46
  47 /* Run the second compilation of -fcompare-debug.  Not defined using
  48    Var in common.opt because this is used in Ada code and so must be
  49    an actual variable not a macro.  */
  50 extern int flag_compare_debug;
  51
  52 /* The default visibility for all symbols (unless overridden).  */
  53 extern enum symbol_visibility default_visibility;
  54
  55 /* Global visibility options.  */
  56 extern struct visibility_flags visibility_options;
  57
  58 /* True if this is the LTO front end (lto1).  This is used to disable
  59    gimple generation and lowering passes that are normally run on the
  60    output of a front end.  These passes must be bypassed for lto since
  61    they have already been done before the gimple was written.  */
  62
  63 extern bool in_lto_p;
  64
  65 /* Nonzero if we should write GIMPLE bytecode for link-time optimization.  */
  66
  67 extern int flag_generate_lto;
  68
  69 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
  70    The external way to set the default level is to use
  71    -Wstrict-aliasing=level.
  72    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
  73    and 0 otherwise.  After calling this function, wstrict_aliasing will be
  74    set to the default value of -Wstrict_aliasing=level.  */
  75
  76 extern void set_Wstrict_aliasing (int onoff);
  77
  78 /* Nonzero means warn about any objects definitions whose size is larger
  79    than N bytes.  Also want about function definitions whose returned
  80    values are larger than N bytes. The value N is in `larger_than_size'.  */
  81
  82 extern bool warn_larger_than;
  83 extern HOST_WIDE_INT larger_than_size;
  84
  85 /* Nonzero means warn about any function whose frame size is larger
  86    than N bytes. */
  87
  88 extern bool warn_frame_larger_than;
  89 extern HOST_WIDE_INT frame_larger_than_size;
  90
  91 /* Nonzero for -dp: annotate the assembly with a comment describing the
  92    pattern and alternative used.  */
  93
  94 extern int flag_print_asm_name;
  95 \f
  96 /* Now the symbols that are set with `-f' switches.  */
  97
  98 /* Nonzero if we are only using compiler to check syntax errors.  */
  99
 100 extern int rtl_dump_and_exit;
 101
 102 /* Nonzero means we should save auxiliary info into a .X file.  */
 103
 104 extern int flag_gen_aux_info;
 105
 106 /* True if printing into -fdump-final-insns= dump.  */
 107
 108 extern bool final_insns_dump_p;
 109
 110 /* Nonzero means change certain warnings into errors.
 111    Usually these are warnings about failure to conform to some standard.  */
 112
 113 extern int flag_pedantic_errors;
 114
 115 /* Nonzero means make permerror produce warnings instead of errors.  */
 116
 117 extern int flag_permissive;
 118
 119 /* Nonzero if we are compiling code for a shared library, zero for
 120    executable.  */
 121
 122 extern int flag_shlib;
 123
 124 /* -dA causes debug information to be produced in
 125    the generated assembly code (to make it more readable).  This option
 126    is generally only of use to those who actually need to read the
 127    generated assembly code (perhaps while debugging the compiler itself).
 128    Currently, this switch is only used by dwarfout.c; however, it is intended
 129    to be a catchall for printing debug information in the assembler file.  */
 130
 131 extern int flag_debug_asm;
 132
 133 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 134
 135 extern int flag_next_runtime;
 136
 137 extern int flag_dump_rtl_in_asm;
 138
 139 /* The excess precision specified on the command line, or defaulted by
 140    the front end.  */
 141 extern enum excess_precision flag_excess_precision_cmdline;
 142 \f
 143 /* Other basic status info about current function.  */
 144
 145 /* Target-dependent global state.  */
 146 struct target_flag_state {
 147   /* Values of the -falign-* flags: how much to align labels in code.
 148      0 means `use default', 1 means `don't align'.
 149      For each variable, there is an _log variant which is the power
 150      of two not less than the variable, for .align output.  */
 151   int x_align_loops_log;
 152   int x_align_loops_max_skip;
 153   int x_align_jumps_log;
 154   int x_align_jumps_max_skip;
 155   int x_align_labels_log;
 156   int x_align_labels_max_skip;
 157   int x_align_functions_log;
 158
 159   /* The excess precision currently in effect.  */
 160   enum excess_precision x_flag_excess_precision;
 161 };
 162
 163 extern struct target_flag_state default_target_flag_state;
 164 #if SWITCHABLE_TARGET
 165 extern struct target_flag_state *this_target_flag_state;
 166 #else
 167 #define this_target_flag_state (&default_target_flag_state)
 168 #endif
 169
 170 #define align_loops_log \
 171   (this_target_flag_state->x_align_loops_log)
 172 #define align_loops_max_skip \
 173   (this_target_flag_state->x_align_loops_max_skip)
 174 #define align_jumps_log \
 175   (this_target_flag_state->x_align_jumps_log)
 176 #define align_jumps_max_skip \
 177   (this_target_flag_state->x_align_jumps_max_skip)
 178 #define align_labels_log \
 179   (this_target_flag_state->x_align_labels_log)
 180 #define align_labels_max_skip \
 181   (this_target_flag_state->x_align_labels_max_skip)
 182 #define align_functions_log \
 183   (this_target_flag_state->x_align_functions_log)
 184 #define flag_excess_precision \
 185   (this_target_flag_state->x_flag_excess_precision)
 186
 187 /* Nonzero if we dump in VCG format, not plain text.  */
 188 extern int dump_for_graph;
 189
 190 extern enum graph_dump_types graph_dump_format;
 191
 192 extern enum stack_check_type flag_stack_check;
 193
 194 /* Returns TRUE if generated code should match ABI version N or
 195    greater is in use.  */
 196
 197 #define abi_version_at_least(N) \
 198   (flag_abi_version == 0 || flag_abi_version >= (N))
 199
 200 /* Return whether the function should be excluded from
 201    instrumentation.  */
 202 extern bool flag_instrument_functions_exclude_p (tree fndecl);
 203
 204 /* True if overflow wraps around for the given integral type.  That
 205    is, TYPE_MAX + 1 == TYPE_MIN.  */
 206 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 207   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 208
 209 /* True if overflow is undefined for the given integral type.  We may
 210    optimize on the assumption that values in the type never overflow.
 211
 212    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 213    must issue a warning based on warn_strict_overflow.  In some cases
 214    it will be appropriate to issue the warning immediately, and in
 215    other cases it will be appropriate to simply set a flag and let the
 216    caller decide whether a warning is appropriate or not.  */
 217 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 218   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 219
 220 /* True if overflow for the given integral type should issue a
 221    trap.  */
 222 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 223   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 224
 225 /* True if pointer types have undefined overflow.  */
 226 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 227
 228 /* Whether to emit an overflow warning whose code is C.  */
 229 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 230
 231 #endif
 232
 233 #endif /* ! GCC_FLAGS_H */