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1 /* Compilation switch flag definitions for GCC.
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2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
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3 2003, 2004, 2005, 2006, 2007, 2008, 2009
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4 Free Software Foundation, Inc.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #ifndef GCC_FLAGS_H
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23 #define GCC_FLAGS_H
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24
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25 #include "coretypes.h"
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26 #include "options.h"
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27 #include "real.h"
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28
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29 enum debug_info_type
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30 {
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31 NO_DEBUG, /* Write no debug info. */
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32 DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */
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33 SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */
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34 DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */
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35 XCOFF_DEBUG, /* Write IBM/Xcoff debug info (using dbxout.c). */
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36 VMS_DEBUG, /* Write VMS debug info (using vmsdbgout.c). */
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37 VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
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38 and DWARF v2 debug info (using dwarf2out.c). */
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39 };
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40
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41 /* Specify which kind of debugging info to generate. */
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42 extern enum debug_info_type write_symbols;
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43
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44 /* Names of debug_info_type, for error messages. */
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45 extern const char *const debug_type_names[];
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46
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47 enum debug_info_level
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48 {
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49 DINFO_LEVEL_NONE, /* Write no debugging info. */
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50 DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */
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51 DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */
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52 DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */
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53 };
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54
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55 /* Specify how much debugging info to generate. */
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56 extern enum debug_info_level debug_info_level;
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57
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58 /* A major contribution to object and executable size is debug
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59 information size. A major contribution to debug information
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60 size is struct descriptions replicated in several object files.
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61 The following function determines whether or not debug information
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62 should be generated for a given struct. The indirect parameter
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63 indicates that the struct is being handled indirectly, via
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64 a pointer. See opts.c for the implementation. */
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65
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66 enum debug_info_usage
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67 {
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68 DINFO_USAGE_DFN, /* A struct definition. */
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69 DINFO_USAGE_DIR_USE, /* A direct use, such as the type of a variable. */
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70 DINFO_USAGE_IND_USE, /* An indirect use, such as through a pointer. */
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71 DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
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72 };
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73
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74 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
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75 extern void set_struct_debug_option (const char *value);
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76
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77 /* Nonzero means use GNU-only extensions in the generated symbolic
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78 debugging information. */
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79 extern bool use_gnu_debug_info_extensions;
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80
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81 /* Enumerate visibility settings. This is deliberately ordered from most
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82 to least visibility. */
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83 #ifndef SYMBOL_VISIBILITY_DEFINED
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84 #define SYMBOL_VISIBILITY_DEFINED
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85 enum symbol_visibility
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86 {
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87 VISIBILITY_DEFAULT,
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88 VISIBILITY_PROTECTED,
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89 VISIBILITY_HIDDEN,
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90 VISIBILITY_INTERNAL
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91 };
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92 #endif
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93
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94 /* The default visibility for all symbols (unless overridden). */
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95 extern enum symbol_visibility default_visibility;
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96
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97 struct visibility_flags
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98 {
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99 unsigned inpragma : 1; /* True when in #pragma GCC visibility. */
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100 unsigned inlines_hidden : 1; /* True when -finlineshidden in effect. */
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101 };
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102
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103 /* Global visibility options. */
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104 extern struct visibility_flags visibility_options;
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105
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106 /* Nonzero means do optimizations. -opt. */
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107
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108 extern int optimize;
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109
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110 /* Nonzero means optimize for size. -Os. */
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111
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112 extern int optimize_size;
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113
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114 /* Do print extra warnings (such as for uninitialized variables).
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115 -W/-Wextra. */
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116
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117 extern bool extra_warnings;
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118
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119 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
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120 The external way to set the default level is to use
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121 -Wstrict-aliasing=level.
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122 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
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123 and 0 otherwise. After calling this function, wstrict_aliasing will be
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124 set to the default value of -Wstrict_aliasing=level. */
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125
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126 extern void set_Wstrict_aliasing (int onoff);
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127
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128 /* Nonzero means warn about any objects definitions whose size is larger
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129 than N bytes. Also want about function definitions whose returned
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130 values are larger than N bytes. The value N is in `larger_than_size'. */
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131
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132 extern bool warn_larger_than;
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133 extern HOST_WIDE_INT larger_than_size;
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134
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135 /* Nonzero means warn about any function whose frame size is larger
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136 than N bytes. */
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137
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138 extern bool warn_frame_larger_than;
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139 extern HOST_WIDE_INT frame_larger_than_size;
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140
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141 /* Nonzero for -dp: annotate the assembly with a comment describing the
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142 pattern and alternative used. */
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143
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144 extern int flag_print_asm_name;
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145
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146 /* Now the symbols that are set with `-f' switches. */
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147
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148 /* Nonzero means `char' should be signed. */
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149
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150 extern int flag_signed_char;
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151
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152 /* Nonzero means give an enum type only as many bytes as it needs. A value
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153 of 2 means it has not yet been initialized. */
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154
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155 extern int flag_short_enums;
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156
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157 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
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158
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159 extern int flag_pcc_struct_return;
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160
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161 /* 0 means straightforward implementation of complex divide acceptable.
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162 1 means wide ranges of inputs must work for complex divide.
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163 2 means C99-like requirements for complex multiply and divide. */
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164
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165 extern int flag_complex_method;
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166
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167 /* Nonzero if we are only using compiler to check syntax errors. */
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168
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169 extern int rtl_dump_and_exit;
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170
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171 /* Nonzero means we should save auxiliary info into a .X file. */
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172
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173 extern int flag_gen_aux_info;
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174
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175 /* Nonzero means suppress output of instruction numbers and line number
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176 notes in debugging dumps. */
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177
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178 extern int flag_dump_unnumbered;
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179
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180 /* Nonzero means change certain warnings into errors.
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181 Usually these are warnings about failure to conform to some standard. */
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182
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183 extern int flag_pedantic_errors;
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184
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185 /* Nonzero means make permerror produce warnings instead of errors. */
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186
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187 extern int flag_permissive;
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188
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189 /* Nonzero if we are compiling code for a shared library, zero for
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190 executable. */
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191
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192 extern int flag_shlib;
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193
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194 /* -dA causes debug information to be produced in
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195 the generated assembly code (to make it more readable). This option
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196 is generally only of use to those who actually need to read the
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197 generated assembly code (perhaps while debugging the compiler itself).
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198 Currently, this switch is only used by dwarfout.c; however, it is intended
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199 to be a catchall for printing debug information in the assembler file. */
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200
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201 extern int flag_debug_asm;
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202
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203 /* Generate code for GNU or NeXT Objective-C runtime environment. */
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204
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205 extern int flag_next_runtime;
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206
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207 extern int flag_dump_rtl_in_asm;
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208
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209 /* The algorithm used for the integrated register allocator (IRA). */
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210 enum ira_algorithm
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211 {
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212 IRA_ALGORITHM_CB,
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213 IRA_ALGORITHM_PRIORITY
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214 };
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215
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216 extern enum ira_algorithm flag_ira_algorithm;
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217
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218 /* The regions used for the integrated register allocator (IRA). */
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219 enum ira_region
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220 {
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221 IRA_REGION_ONE,
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222 IRA_REGION_ALL,
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223 IRA_REGION_MIXED
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224 };
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225
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226 extern enum ira_region flag_ira_region;
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227
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228 extern unsigned int flag_ira_verbose;
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229
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230
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231 /* Other basic status info about current function. */
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232
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233 /* Nonzero if subexpressions must be evaluated from left-to-right. */
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234 extern int flag_evaluation_order;
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235
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236 /* Value of the -G xx switch, and whether it was passed or not. */
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237 extern unsigned HOST_WIDE_INT g_switch_value;
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238 extern bool g_switch_set;
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239
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240 /* Same for selective scheduling. */
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241 extern bool sel_sched_switch_set;
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242
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243 /* Values of the -falign-* flags: how much to align labels in code.
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244 0 means `use default', 1 means `don't align'.
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245 For each variable, there is an _log variant which is the power
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246 of two not less than the variable, for .align output. */
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247
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248 extern int align_loops_log;
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249 extern int align_loops_max_skip;
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250 extern int align_jumps_log;
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251 extern int align_jumps_max_skip;
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252 extern int align_labels_log;
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253 extern int align_labels_max_skip;
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254 extern int align_functions_log;
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255
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256 /* Nonzero if we dump in VCG format, not plain text. */
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257 extern int dump_for_graph;
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258
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259 /* Selection of the graph form. */
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260 enum graph_dump_types
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261 {
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262 no_graph = 0,
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263 vcg
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264 };
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265 extern enum graph_dump_types graph_dump_format;
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266
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267 /* Nonzero means to collect statistics which might be expensive
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268 and to print them when we are done. */
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269 extern int flag_detailed_statistics;
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270
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271 /* Nonzero means that we defer emitting functions until they are actually
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272 used. */
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273 extern int flag_remove_unreachable_functions;
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274
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275 /* Nonzero if we should track variables. */
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276 extern int flag_var_tracking;
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277
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278 /* True if flag_speculative_prefetching was set by user. Used to suppress
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279 warning message in case flag was set by -fprofile-{generate,use}. */
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280 extern bool flag_speculative_prefetching_set;
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281
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282 /* Type of stack check. */
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283 enum stack_check_type
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284 {
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285 /* Do not check the stack. */
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286 NO_STACK_CHECK = 0,
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287
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288 /* Check the stack generically, i.e. assume no specific support
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289 from the target configuration files. */
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290 GENERIC_STACK_CHECK,
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291
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292 /* Check the stack and rely on the target configuration files to
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293 check the static frame of functions, i.e. use the generic
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294 mechanism only for dynamic stack allocations. */
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295 STATIC_BUILTIN_STACK_CHECK,
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296
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297 /* Check the stack and entirely rely on the target configuration
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298 files, i.e. do not use the generic mechanism at all. */
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299 FULL_BUILTIN_STACK_CHECK
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300 };
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301 extern enum stack_check_type flag_stack_check;
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302
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303 /* Returns TRUE if generated code should match ABI version N or
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304 greater is in use. */
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305
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306 #define abi_version_at_least(N) \
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307 (flag_abi_version == 0 || flag_abi_version >= (N))
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308
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309 /* Return whether the function should be excluded from
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310 instrumentation. */
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311 extern bool flag_instrument_functions_exclude_p (tree fndecl);
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312
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313 /* True if the given mode has a NaN representation and the treatment of
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314 NaN operands is important. Certain optimizations, such as folding
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315 x * 0 into 0, are not correct for NaN operands, and are normally
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316 disabled for modes with NaNs. The user can ask for them to be
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317 done anyway using the -funsafe-math-optimizations switch. */
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318 #define HONOR_NANS(MODE) \
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319 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
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320
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321 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
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322 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
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323
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324 /* As for HONOR_NANS, but true if the mode can represent infinity and
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325 the treatment of infinite values is important. */
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326 #define HONOR_INFINITIES(MODE) \
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327 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
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328
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329 /* Like HONOR_NANS, but true if the given mode distinguishes between
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330 positive and negative zero, and the sign of zero is important. */
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331 #define HONOR_SIGNED_ZEROS(MODE) \
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332 (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
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333
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334 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
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335 and the rounding mode is important. */
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336 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
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337 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
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338
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339 /* True if overflow wraps around for the given integral type. That
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340 is, TYPE_MAX + 1 == TYPE_MIN. */
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341 #define TYPE_OVERFLOW_WRAPS(TYPE) \
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342 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
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343
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344 /* True if overflow is undefined for the given integral type. We may
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345 optimize on the assumption that values in the type never overflow.
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346
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347 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
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348 must issue a warning based on warn_strict_overflow. In some cases
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349 it will be appropriate to issue the warning immediately, and in
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350 other cases it will be appropriate to simply set a flag and let the
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351 caller decide whether a warning is appropriate or not. */
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352 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
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353 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
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354
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355 /* True if overflow for the given integral type should issue a
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356 trap. */
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357 #define TYPE_OVERFLOW_TRAPS(TYPE) \
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358 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
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359
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360 /* True if pointer types have undefined overflow. */
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361 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
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362
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363 /* Names for the different levels of -Wstrict-overflow=N. The numeric
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364 values here correspond to N. */
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365
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366 enum warn_strict_overflow_code
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367 {
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368 /* Overflow warning that should be issued with -Wall: a questionable
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369 construct that is easy to avoid even when using macros. Example:
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370 folding (x + CONSTANT > x) to 1. */
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371 WARN_STRICT_OVERFLOW_ALL = 1,
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372 /* Overflow warning about folding a comparison to a constant because
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373 of undefined signed overflow, other than cases covered by
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374 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
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375 (this is false when x == INT_MIN). */
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376 WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
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377 /* Overflow warning about changes to comparisons other than folding
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378 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
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379 WARN_STRICT_OVERFLOW_COMPARISON = 3,
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380 /* Overflow warnings not covered by the above cases. Example:
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381 folding ((x * 10) / 5) to (x * 2). */
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382 WARN_STRICT_OVERFLOW_MISC = 4,
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383 /* Overflow warnings about reducing magnitude of constants in
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384 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
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385 WARN_STRICT_OVERFLOW_MAGNITUDE = 5
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386 };
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387
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388 /* Whether to emit an overflow warning whose code is C. */
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389 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
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390
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391 #endif /* ! GCC_FLAGS_H */
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