| 1 | // parameters.h -- general parameters for a link using gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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_PARAMETERS_H |
| 24 | #define GOLD_PARAMETERS_H |
| 25 | |
| 26 | namespace gold |
| 27 | { |
| 28 | |
| 29 | class General_options; |
| 30 | class Errors; |
| 31 | class Target; |
| 32 | template<int size, bool big_endian> |
| 33 | class Sized_target; |
| 34 | class Set_parameters_target_once; |
| 35 | |
| 36 | // Here we define the Parameters class which simply holds simple |
| 37 | // general parameters which apply to the entire link. We use a global |
| 38 | // variable for this. The parameters class holds three types of data: |
| 39 | // 1) An Errors struct. Any part of the code that wants to log an |
| 40 | // error can use parameters->errors(). |
| 41 | // 2) A const General_options. These are the options as read on |
| 42 | // the commandline. |
| 43 | // 3) Target information, such as size and endian-ness. This is |
| 44 | // available as soon as we've decided on the Target (after |
| 45 | // parsing the first .o file). |
| 46 | // 4) Whether we're doing a static link or not. This is set |
| 47 | // after all inputs have been read and we know if any is a |
| 48 | // dynamic library. |
| 49 | |
| 50 | class Parameters |
| 51 | { |
| 52 | public: |
| 53 | Parameters(); |
| 54 | |
| 55 | // These should be called as soon as they are known. |
| 56 | void |
| 57 | set_errors(Errors* errors); |
| 58 | |
| 59 | void |
| 60 | set_options(const General_options* options); |
| 61 | |
| 62 | void |
| 63 | set_target(Target* target); |
| 64 | |
| 65 | void |
| 66 | set_doing_static_link(bool doing_static_link); |
| 67 | |
| 68 | // Return the error object. |
| 69 | Errors* |
| 70 | errors() const |
| 71 | { return this->errors_; } |
| 72 | |
| 73 | // Whether the options are valid. This should not normally be |
| 74 | // called, but it is needed by gold_exit. |
| 75 | bool |
| 76 | options_valid() const |
| 77 | { return this->options_ != NULL; } |
| 78 | |
| 79 | // Return the options object. |
| 80 | const General_options& |
| 81 | options() const |
| 82 | { |
| 83 | gold_assert(this->options_valid()); |
| 84 | return *this->options_; |
| 85 | } |
| 86 | |
| 87 | // Return whether the target field has been set. |
| 88 | bool |
| 89 | target_valid() const |
| 90 | { return this->target_ != NULL; } |
| 91 | |
| 92 | // The target of the output file we are generating. |
| 93 | const Target& |
| 94 | target() const |
| 95 | { |
| 96 | gold_assert(this->target_valid()); |
| 97 | return *this->target_; |
| 98 | } |
| 99 | |
| 100 | // The Sized_target of the output file. The caller must request the |
| 101 | // right size and endianness. |
| 102 | template<int size, bool big_endian> |
| 103 | Sized_target<size, big_endian>* |
| 104 | sized_target() const |
| 105 | { |
| 106 | gold_assert(this->target_valid()); |
| 107 | return static_cast<Sized_target<size, big_endian>*>(this->target_); |
| 108 | } |
| 109 | |
| 110 | // Clear the target, for testing. |
| 111 | void |
| 112 | clear_target(); |
| 113 | |
| 114 | // Return true if TARGET is compatible with the current target. |
| 115 | bool |
| 116 | is_compatible_target(const Target*) const; |
| 117 | |
| 118 | bool |
| 119 | doing_static_link() const |
| 120 | { |
| 121 | gold_assert(this->doing_static_link_valid_); |
| 122 | return this->doing_static_link_; |
| 123 | } |
| 124 | |
| 125 | // This is just a copy of options().debug(). We make a copy so we |
| 126 | // don't have to #include options.h in order to inline |
| 127 | // is_debugging_enabled, below. |
| 128 | int |
| 129 | debug() const |
| 130 | { |
| 131 | // This can be called before the options are set up. |
| 132 | if (!this->options_valid()) |
| 133 | return 0; |
| 134 | return debug_; |
| 135 | } |
| 136 | |
| 137 | // Return the name of the entry symbol. |
| 138 | const char* |
| 139 | entry() const; |
| 140 | |
| 141 | // A convenience routine for combining size and endianness. It also |
| 142 | // checks the HAVE_TARGET_FOO configure options and dies if the |
| 143 | // current target's size/endianness is not supported according to |
| 144 | // HAVE_TARGET_FOO. Otherwise it returns this enum |
| 145 | enum Target_size_endianness |
| 146 | { TARGET_32_LITTLE, TARGET_32_BIG, TARGET_64_LITTLE, TARGET_64_BIG }; |
| 147 | |
| 148 | Target_size_endianness |
| 149 | size_and_endianness() const; |
| 150 | |
| 151 | // Set the incremental linking mode to INCREMENTAL_FULL. Used when |
| 152 | // the linker determines that an incremental update is not possible. |
| 153 | // Returns false if the incremental mode was INCREMENTAL_UPDATE, |
| 154 | // indicating that the linker should exit if an update is not possible. |
| 155 | bool |
| 156 | set_incremental_full(); |
| 157 | |
| 158 | // Return true if we need to prepare incremental linking information. |
| 159 | bool |
| 160 | incremental() const; |
| 161 | |
| 162 | // Return true if we are doing a full incremental link. |
| 163 | bool |
| 164 | incremental_full() const; |
| 165 | |
| 166 | // Return true if we are doing an incremental update. |
| 167 | bool |
| 168 | incremental_update() const; |
| 169 | |
| 170 | private: |
| 171 | void |
| 172 | set_target_once(Target*); |
| 173 | |
| 174 | void |
| 175 | check_target_endianness(); |
| 176 | |
| 177 | friend class Set_parameters_target_once; |
| 178 | |
| 179 | Errors* errors_; |
| 180 | const General_options* options_; |
| 181 | Target* target_; |
| 182 | bool doing_static_link_valid_; |
| 183 | bool doing_static_link_; |
| 184 | int debug_; |
| 185 | int incremental_mode_; |
| 186 | Set_parameters_target_once* set_parameters_target_once_; |
| 187 | }; |
| 188 | |
| 189 | // This is a global variable. |
| 190 | extern const Parameters* parameters; |
| 191 | |
| 192 | // We use free functions for these since they affect a global variable |
| 193 | // that is internal to parameters.cc. |
| 194 | |
| 195 | extern void |
| 196 | set_parameters_errors(Errors* errors); |
| 197 | |
| 198 | extern void |
| 199 | set_parameters_options(const General_options* options); |
| 200 | |
| 201 | extern void |
| 202 | set_parameters_target(Target* target); |
| 203 | |
| 204 | extern void |
| 205 | set_parameters_doing_static_link(bool doing_static_link); |
| 206 | |
| 207 | extern bool |
| 208 | set_parameters_incremental_full(); |
| 209 | |
| 210 | // Ensure that the target to be valid by using the default target if |
| 211 | // necessary. |
| 212 | |
| 213 | extern void |
| 214 | parameters_force_valid_target(); |
| 215 | |
| 216 | // Clear the current target, for testing. |
| 217 | |
| 218 | extern void |
| 219 | parameters_clear_target(); |
| 220 | |
| 221 | // Return whether we are doing a particular debugging type. The |
| 222 | // argument is one of the flags from debug.h. |
| 223 | |
| 224 | inline bool |
| 225 | is_debugging_enabled(unsigned int type) |
| 226 | { return (parameters->debug() & type) != 0; } |
| 227 | |
| 228 | } // End namespace gold. |
| 229 | |
| 230 | #endif // !defined(GOLD_PARAMETERS_H) |