gold/gold.h

   1 // gold.h -- general definitions for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #ifndef GOLD_GOLD_H
  24 #define GOLD_GOLD_H
  25
  26 #include "config.h"
  27 #include "ansidecl.h"
  28
  29 #ifdef ENABLE_NLS
  30 # include <libintl.h>
  31 # define _(String) gettext (String)
  32 # ifdef gettext_noop
  33 #  define N_(String) gettext_noop (String)
  34 # else
  35 #  define N_(String) (String)
  36 # endif
  37 #else
  38 # define gettext(Msgid) (Msgid)
  39 # define dgettext(Domainname, Msgid) (Msgid)
  40 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  41 # define textdomain(Domainname) while (0) /* nothing */
  42 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
  43 # define _(String) (String)
  44 # define N_(String) (String)
  45 #endif
  46
  47 // Figure out how to get a hash set and a hash map.
  48
  49 #if defined(HAVE_TR1_UNORDERED_SET) && defined(HAVE_TR1_UNORDERED_MAP)
  50
  51 #include <tr1/unordered_set>
  52 #include <tr1/unordered_map>
  53
  54 // We need a template typedef here.
  55
  56 #define Unordered_set std::tr1::unordered_set
  57 #define Unordered_map std::tr1::unordered_map
  58
  59 #elif defined(HAVE_EXT_HASH_MAP) && defined(HAVE_EXT_HASH_SET)
  60
  61 #include <ext/hash_map>
  62 #include <ext/hash_set>
  63 #include <string>
  64
  65 #define Unordered_set __gnu_cxx::hash_set
  66 #define Unordered_map __gnu_cxx::hash_map
  67
  68 namespace __gnu_cxx
  69 {
  70
  71 template<>
  72 struct hash<std::string>
  73 {
  74   size_t
  75   operator()(std::string s) const
  76   { return __stl_hash_string(s.c_str()); }
  77 };
  78
  79 template<typename T>
  80 struct hash<T*>
  81 {
  82   size_t
  83   operator()(T* p) const
  84   { return reinterpret_cast<size_t>(p); }
  85 };
  86
  87 }
  88
  89 #else
  90
  91 // The fallback is to just use set and map.
  92
  93 #include <set>
  94 #include <map>
  95
  96 #define Unordered_set std::set
  97 #define Unordered_map std::map
  98
  99 #endif
 100
 101 #ifndef HAVE_PREAD
 102 extern "C" ssize_t pread(int, void*, size_t, off_t);
 103 #endif
 104
 105 namespace gold
 106 {
 107 // This is a hack to work around a problem with older versions of g++.
 108 // The problem is that they don't support calling a member template by
 109 // specifying the template parameters.  It works to pass in an
 110 // argument for argument dependent lookup.
 111
 112 // To use this, the member template method declaration should put
 113 // ACCEPT_SIZE or ACCEPT_SIZE_ENDIAN after the last parameter.  If the
 114 // method takes no parameters, use ACCEPT_SIZE_ONLY or
 115 // ACCEPT_SIZE_ENDIAN_ONLY.
 116
 117 // When calling the method, instead of using fn<size>, use fn
 118 // SELECT_SIZE_NAME or SELECT_SIZE_ENDIAN_NAME.  And after the last
 119 // argument, put SELECT_SIZE(size) or SELECT_SIZE_ENDIAN(size,
 120 // big_endian).  If there is only one argment, use the _ONLY variants.
 121
 122 #ifdef HAVE_MEMBER_TEMPLATE_SPECIFICATIONS
 123
 124 #define SELECT_SIZE_NAME(size) <size>
 125 #define SELECT_SIZE(size)
 126 #define SELECT_SIZE_ONLY(size)
 127 #define ACCEPT_SIZE
 128 #define ACCEPT_SIZE_ONLY
 129 #define ACCEPT_SIZE_EXPLICIT(size)
 130
 131 #define SELECT_SIZE_ENDIAN_NAME(size, big_endian) <size, big_endian>
 132 #define SELECT_SIZE_ENDIAN(size, big_endian)
 133 #define SELECT_SIZE_ENDIAN_ONLY(size, big_endian)
 134 #define ACCEPT_SIZE_ENDIAN
 135 #define ACCEPT_SIZE_ENDIAN_ONLY
 136 #define ACCEPT_SIZE_ENDIAN_EXPLICIT(size, big_endian)
 137
 138 #else // !defined(HAVE_MEMBER_TEMPLATE_SPECIFICATIONS)
 139
 140 template<int size>
 141 class Select_size { };
 142 template<int size, bool big_endian>
 143 class Select_size_endian { };
 144
 145 #define SELECT_SIZE_NAME(size)
 146 #define SELECT_SIZE(size) , Select_size<size>()
 147 #define SELECT_SIZE_ONLY(size) Select_size<size>()
 148 #define ACCEPT_SIZE , Select_size<size>
 149 #define ACCEPT_SIZE_ONLY Select_size<size>
 150 #define ACCEPT_SIZE_EXPLICIT(size) , Select_size<size>
 151
 152 #define SELECT_SIZE_ENDIAN_NAME(size, big_endian)
 153 #define SELECT_SIZE_ENDIAN(size, big_endian) \
 154   , Select_size_endian<size, big_endian>()
 155 #define SELECT_SIZE_ENDIAN_ONLY(size, big_endian) \
 156   Select_size_endian<size, big_endian>()
 157 #define ACCEPT_SIZE_ENDIAN , Select_size_endian<size, big_endian>
 158 #define ACCEPT_SIZE_ENDIAN_ONLY Select_size_endian<size, big_endian>
 159 #define ACCEPT_SIZE_ENDIAN_EXPLICIT(size, big_endian) \
 160   , Select_size_endian<size, big_endian>
 161
 162 #endif // !defined(HAVE_MEMBER_TEMPLATE_SPECIFICATIONS)
 163
 164 // General declarations.
 165
 166 class General_options;
 167 class Command_line;
 168 class Input_argument_list;
 169 class Dirsearch;
 170 class Input_objects;
 171 class Symbol;
 172 class Symbol_table;
 173 class Layout;
 174 class Task;
 175 class Workqueue;
 176 class Output_file;
 177 template<int size, bool big_endian>
 178 struct Relocate_info;
 179
 180 // Some basic types.  For these we use lower case initial letters.
 181
 182 // For an offset in an input or output file, use off_t.  Note that
 183 // this will often be a 64-bit type even for a 32-bit build.
 184
 185 // The size of a section if we are going to look at the contents.
 186 typedef size_t section_size_type;
 187
 188 // An offset within a section when we are looking at the contents.
 189 typedef ptrdiff_t section_offset_type;
 190
 191 // The name of the program as used in error messages.
 192 extern const char* program_name;
 193
 194 // This function is called to exit the program.  Status is true to
 195 // exit success (0) and false to exit failure (1).
 196 extern void
 197 gold_exit(bool status) ATTRIBUTE_NORETURN;
 198
 199 // This function is called to emit an error message and then
 200 // immediately exit with failure.
 201 extern void
 202 gold_fatal(const char* format, ...) ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF_1;
 203
 204 // This function is called to issue an error.  This will cause gold to
 205 // eventually exit with failure.
 206 extern void
 207 gold_error(const char* msg, ...) ATTRIBUTE_PRINTF_1;
 208
 209 // This function is called to issue a warning.
 210 extern void
 211 gold_warning(const char* msg, ...) ATTRIBUTE_PRINTF_1;
 212
 213 // This function is called to issue an error at the location of a
 214 // reloc.
 215 template<int size, bool big_endian>
 216 extern void
 217 gold_error_at_location(const Relocate_info<size, big_endian>*,
 218                        size_t, off_t, const char* format, ...)
 219   ATTRIBUTE_PRINTF_4;
 220
 221 // This function is called to issue a warning at the location of a
 222 // reloc.
 223 template<int size, bool big_endian>
 224 extern void
 225 gold_warning_at_location(const Relocate_info<size, big_endian>*,
 226                          size_t, off_t, const char* format, ...)
 227   ATTRIBUTE_PRINTF_4;
 228
 229 // This function is called to report an undefined symbol.
 230 template<int size, bool big_endian>
 231 extern void
 232 gold_undefined_symbol(const Symbol*,
 233                       const Relocate_info<size, big_endian>*,
 234                       size_t, off_t);
 235
 236 // This is function is called in some cases if we run out of memory.
 237 extern void
 238 gold_nomem() ATTRIBUTE_NORETURN;
 239
 240 // This macro and function are used in cases which can not arise if
 241 // the code is written correctly.
 242
 243 #define gold_unreachable() \
 244   (gold::do_gold_unreachable(__FILE__, __LINE__, __FUNCTION__))
 245
 246 extern void do_gold_unreachable(const char*, int, const char*)
 247   ATTRIBUTE_NORETURN;
 248
 249 // Assertion check.
 250
 251 #define gold_assert(expr) ((void)(!(expr) ? gold_unreachable(), 0 : 0))
 252
 253 // Print version information.
 254 extern void
 255 print_version(bool print_short);
 256
 257 // Get the version string.
 258 extern const char*
 259 get_version_string();
 260
 261 // Convert numeric types without unnoticed loss of precision.
 262 template<typename To, typename From>
 263 inline To
 264 convert_types(const From from)
 265 {
 266   To to = from;
 267   gold_assert(static_cast<From>(to) == from);
 268   return to;
 269 }
 270
 271 // A common case of convert_types<>: convert to section_size_type.
 272 template<typename From>
 273 inline section_size_type
 274 convert_to_section_size_type(const From from)
 275 { return convert_types<section_size_type, From>(from); }
 276
 277 // Queue up the first set of tasks.
 278 extern void
 279 queue_initial_tasks(const General_options&,
 280                     Dirsearch&,
 281                     const Command_line&,
 282                     Workqueue*,
 283                     Input_objects*,
 284                     Symbol_table*,
 285                     Layout*);
 286
 287 // Queue up the middle set of tasks.
 288 extern void
 289 queue_middle_tasks(const General_options&,
 290                    const Task*,
 291                    const Input_objects*,
 292                    Symbol_table*,
 293                    Layout*,
 294                    Workqueue*);
 295
 296 // Queue up the final set of tasks.
 297 extern void
 298 queue_final_tasks(const General_options&,
 299                   const Input_objects*,
 300                   const Symbol_table*,
 301                   Layout*,
 302                   Workqueue*,
 303                   Output_file* of);
 304
 305 } // End namespace gold.
 306
 307 #endif // !defined(GOLD_GOLD_H)