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 /* Names of debug_info_type, for error messages.  */
  32 extern const char *const debug_type_names[];
  33
  34 extern void strip_off_ending (char *, int);
  35 extern int base_of_path (const char *path, const char **base_out);
  36 extern void set_struct_debug_option (struct gcc_options *opts,
  37                                      const char *value);
  38
  39 /* Run the second compilation of -fcompare-debug.  Not defined using
  40    Var in common.opt because this is used in Ada code and so must be
  41    an actual variable not a macro.  */
  42 extern int flag_compare_debug;
  43
  44 /* True if this is the LTO front end (lto1).  This is used to disable
  45    gimple generation and lowering passes that are normally run on the
  46    output of a front end.  These passes must be bypassed for lto since
  47    they have already been done before the gimple was written.  */
  48
  49 extern bool in_lto_p;
  50
  51 /* Return true iff flags are set as if -ffast-math.  */
  52 extern bool fast_math_flags_set_p (const struct gcc_options *);
  53 extern bool fast_math_flags_struct_set_p (struct cl_optimization *);
  54
  55 /* Used to set the level of -Wstrict-aliasing in OPTS, when no level
  56    is specified.  The external way to set the default level is to use
  57    -Wstrict-aliasing=level.
  58    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
  59    and 0 otherwise.  After calling this function, wstrict_aliasing will be
  60    set to the default value of -Wstrict_aliasing=level.  */
  61
  62 extern void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
  63
  64 /* Nonzero for -dp: annotate the assembly with a comment describing the
  65    pattern and alternative used.  */
  66
  67 extern int flag_print_asm_name;
  68 \f
  69 /* Now the symbols that are set with `-f' switches.  */
  70
  71 /* Nonzero if we are only using compiler to check syntax errors.  */
  72
  73 extern int rtl_dump_and_exit;
  74
  75 /* True if printing into -fdump-final-insns= dump.  */
  76
  77 extern bool final_insns_dump_p;
  78
  79 /* Nonzero means make permerror produce warnings instead of errors.  */
  80
  81 extern int flag_permissive;
  82
  83 /* -dA causes debug information to be produced in
  84    the generated assembly code (to make it more readable).  This option
  85    is generally only of use to those who actually need to read the
  86    generated assembly code (perhaps while debugging the compiler itself).
  87    Currently, this switch is only used by dwarfout.c; however, it is intended
  88    to be a catchall for printing debug information in the assembler file.  */
  89
  90 extern int flag_debug_asm;
  91
  92 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
  93
  94 extern int flag_next_runtime;
  95
  96 extern int flag_dump_rtl_in_asm;
  97 \f
  98 /* Other basic status info about current function.  */
  99
 100 /* Target-dependent global state.  */
 101 struct target_flag_state {
 102   /* Values of the -falign-* flags: how much to align labels in code.
 103      0 means `use default', 1 means `don't align'.
 104      For each variable, there is an _log variant which is the power
 105      of two not less than the variable, for .align output.  */
 106   int x_align_loops_log;
 107   int x_align_loops_max_skip;
 108   int x_align_jumps_log;
 109   int x_align_jumps_max_skip;
 110   int x_align_labels_log;
 111   int x_align_labels_max_skip;
 112   int x_align_functions_log;
 113
 114   /* The excess precision currently in effect.  */
 115   enum excess_precision x_flag_excess_precision;
 116 };
 117
 118 extern struct target_flag_state default_target_flag_state;
 119 #if SWITCHABLE_TARGET
 120 extern struct target_flag_state *this_target_flag_state;
 121 #else
 122 #define this_target_flag_state (&default_target_flag_state)
 123 #endif
 124
 125 #define align_loops_log \
 126   (this_target_flag_state->x_align_loops_log)
 127 #define align_loops_max_skip \
 128   (this_target_flag_state->x_align_loops_max_skip)
 129 #define align_jumps_log \
 130   (this_target_flag_state->x_align_jumps_log)
 131 #define align_jumps_max_skip \
 132   (this_target_flag_state->x_align_jumps_max_skip)
 133 #define align_labels_log \
 134   (this_target_flag_state->x_align_labels_log)
 135 #define align_labels_max_skip \
 136   (this_target_flag_state->x_align_labels_max_skip)
 137 #define align_functions_log \
 138   (this_target_flag_state->x_align_functions_log)
 139 #define flag_excess_precision \
 140   (this_target_flag_state->x_flag_excess_precision)
 141
 142 /* Nonzero if we dump in VCG format, not plain text.  */
 143 extern int dump_for_graph;
 144
 145 extern enum graph_dump_types graph_dump_format;
 146
 147 extern enum stack_check_type flag_stack_check;
 148
 149 /* Returns TRUE if generated code should match ABI version N or
 150    greater is in use.  */
 151
 152 #define abi_version_at_least(N) \
 153   (flag_abi_version == 0 || flag_abi_version >= (N))
 154
 155 /* True if overflow wraps around for the given integral type.  That
 156    is, TYPE_MAX + 1 == TYPE_MIN.  */
 157 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 158   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 159
 160 /* True if overflow is undefined for the given integral type.  We may
 161    optimize on the assumption that values in the type never overflow.
 162
 163    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 164    must issue a warning based on warn_strict_overflow.  In some cases
 165    it will be appropriate to issue the warning immediately, and in
 166    other cases it will be appropriate to simply set a flag and let the
 167    caller decide whether a warning is appropriate or not.  */
 168 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 169   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 170
 171 /* True if overflow for the given integral type should issue a
 172    trap.  */
 173 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 174   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 175
 176 /* True if pointer types have undefined overflow.  */
 177 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 178
 179 /* Whether to emit an overflow warning whose code is C.  */
 180 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 181
 182 #endif
 183
 184 #endif /* ! GCC_FLAGS_H */