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 /* Global visibility options.  */
  53 extern struct visibility_flags visibility_options;
  54
  55 /* True if this is the LTO front end (lto1).  This is used to disable
  56    gimple generation and lowering passes that are normally run on the
  57    output of a front end.  These passes must be bypassed for lto since
  58    they have already been done before the gimple was written.  */
  59
  60 extern bool in_lto_p;
  61
  62 /* Used to set the level of -Wstrict-aliasing in OPTS, when no level
  63    is specified.  The external way to set the default level is to use
  64    -Wstrict-aliasing=level.
  65    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
  66    and 0 otherwise.  After calling this function, wstrict_aliasing will be
  67    set to the default value of -Wstrict_aliasing=level.  */
  68
  69 extern void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
  70
  71 /* Nonzero for -dp: annotate the assembly with a comment describing the
  72    pattern and alternative used.  */
  73
  74 extern int flag_print_asm_name;
  75 \f
  76 /* Now the symbols that are set with `-f' switches.  */
  77
  78 /* Nonzero if we are only using compiler to check syntax errors.  */
  79
  80 extern int rtl_dump_and_exit;
  81
  82 /* True if printing into -fdump-final-insns= dump.  */
  83
  84 extern bool final_insns_dump_p;
  85
  86 /* Nonzero means make permerror produce warnings instead of errors.  */
  87
  88 extern int flag_permissive;
  89
  90 /* -dA causes debug information to be produced in
  91    the generated assembly code (to make it more readable).  This option
  92    is generally only of use to those who actually need to read the
  93    generated assembly code (perhaps while debugging the compiler itself).
  94    Currently, this switch is only used by dwarfout.c; however, it is intended
  95    to be a catchall for printing debug information in the assembler file.  */
  96
  97 extern int flag_debug_asm;
  98
  99 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 100
 101 extern int flag_next_runtime;
 102
 103 extern int flag_dump_rtl_in_asm;
 104 \f
 105 /* Other basic status info about current function.  */
 106
 107 /* Target-dependent global state.  */
 108 struct target_flag_state {
 109   /* Values of the -falign-* flags: how much to align labels in code.
 110      0 means `use default', 1 means `don't align'.
 111      For each variable, there is an _log variant which is the power
 112      of two not less than the variable, for .align output.  */
 113   int x_align_loops_log;
 114   int x_align_loops_max_skip;
 115   int x_align_jumps_log;
 116   int x_align_jumps_max_skip;
 117   int x_align_labels_log;
 118   int x_align_labels_max_skip;
 119   int x_align_functions_log;
 120
 121   /* The excess precision currently in effect.  */
 122   enum excess_precision x_flag_excess_precision;
 123 };
 124
 125 extern struct target_flag_state default_target_flag_state;
 126 #if SWITCHABLE_TARGET
 127 extern struct target_flag_state *this_target_flag_state;
 128 #else
 129 #define this_target_flag_state (&default_target_flag_state)
 130 #endif
 131
 132 #define align_loops_log \
 133   (this_target_flag_state->x_align_loops_log)
 134 #define align_loops_max_skip \
 135   (this_target_flag_state->x_align_loops_max_skip)
 136 #define align_jumps_log \
 137   (this_target_flag_state->x_align_jumps_log)
 138 #define align_jumps_max_skip \
 139   (this_target_flag_state->x_align_jumps_max_skip)
 140 #define align_labels_log \
 141   (this_target_flag_state->x_align_labels_log)
 142 #define align_labels_max_skip \
 143   (this_target_flag_state->x_align_labels_max_skip)
 144 #define align_functions_log \
 145   (this_target_flag_state->x_align_functions_log)
 146 #define flag_excess_precision \
 147   (this_target_flag_state->x_flag_excess_precision)
 148
 149 /* Nonzero if we dump in VCG format, not plain text.  */
 150 extern int dump_for_graph;
 151
 152 extern enum graph_dump_types graph_dump_format;
 153
 154 extern enum stack_check_type flag_stack_check;
 155
 156 /* Returns TRUE if generated code should match ABI version N or
 157    greater is in use.  */
 158
 159 #define abi_version_at_least(N) \
 160   (flag_abi_version == 0 || flag_abi_version >= (N))
 161
 162 /* Return whether the function should be excluded from
 163    instrumentation.  */
 164 extern bool flag_instrument_functions_exclude_p (tree fndecl);
 165
 166 /* True if overflow wraps around for the given integral type.  That
 167    is, TYPE_MAX + 1 == TYPE_MIN.  */
 168 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 169   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 170
 171 /* True if overflow is undefined for the given integral type.  We may
 172    optimize on the assumption that values in the type never overflow.
 173
 174    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 175    must issue a warning based on warn_strict_overflow.  In some cases
 176    it will be appropriate to issue the warning immediately, and in
 177    other cases it will be appropriate to simply set a flag and let the
 178    caller decide whether a warning is appropriate or not.  */
 179 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 180   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 181
 182 /* True if overflow for the given integral type should issue a
 183    trap.  */
 184 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 185   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 186
 187 /* True if pointer types have undefined overflow.  */
 188 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 189
 190 /* Whether to emit an overflow warning whose code is C.  */
 191 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 192
 193 #endif
 194
 195 #endif /* ! GCC_FLAGS_H */