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0e879927 ILT |
1 | // inremental.cc -- incremental linking support for gold |
2 | ||
3 | // Copyright 2009 Free Software Foundation, Inc. | |
4 | // Written by Mikolaj Zalewski <mikolajz@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 | #include "gold.h" | |
24 | #include "elfcpp.h" | |
3ce2c28e ILT |
25 | #include "output.h" |
26 | #include "incremental.h" | |
0e879927 ILT |
27 | |
28 | using elfcpp::Convert; | |
29 | ||
30 | namespace gold { | |
31 | ||
32 | // Version information. Will change frequently during the development, later | |
33 | // we could think about backward (and forward?) compatibility. | |
34 | const int INCREMENTAL_LINK_VERSION = 1; | |
35 | ||
36 | namespace internal { | |
37 | ||
38 | // Header of the .gnu_incremental_input section. | |
3ce2c28e | 39 | struct Incremental_inputs_header_data |
0e879927 ILT |
40 | { |
41 | // Incremental linker version. | |
42 | elfcpp::Elf_Word version; | |
43 | ||
44 | // Numer of input files in the link. | |
45 | elfcpp::Elf_Word input_file_count; | |
46 | ||
47 | // Offset of command line options in .gnu_incremental_strtab. | |
48 | elfcpp::Elf_Word command_line_offset; | |
49 | ||
50 | // Padding. | |
51 | elfcpp::Elf_Word reserved; | |
52 | }; | |
53 | ||
54 | // Data stored in .gnu_incremental_input after the header for each of the | |
55 | // Incremental_input_header_data::input_file_count input entries. | |
3ce2c28e | 56 | struct Incremental_inputs_entry_data |
0e879927 ILT |
57 | { |
58 | // Offset of file name in .gnu_incremental_strtab section. | |
59 | elfcpp::Elf_Word filename_offset; | |
60 | ||
61 | // Offset of data in .gnu_incremental_input. | |
62 | elfcpp::Elf_Word data_offset; | |
63 | ||
64 | // Timestamp (in seconds). | |
65 | elfcpp::Elf_Xword timestamp_sec; | |
66 | ||
67 | // Nano-second part of timestamp (if supported). | |
68 | elfcpp::Elf_Word timestamp_usec; | |
69 | ||
70 | // Type of the input entry. | |
71 | elfcpp::Elf_Half input_type; | |
72 | ||
73 | // Padding. | |
74 | elfcpp::Elf_Half reserved; | |
75 | }; | |
76 | ||
77 | } | |
78 | ||
79 | // Accessors. | |
80 | ||
81 | // See internal::Incremental_input_header for fields descriptions. | |
82 | template<int size, bool big_endian> | |
3ce2c28e | 83 | class Incremental_inputs_header_write |
0e879927 ILT |
84 | { |
85 | public: | |
3ce2c28e ILT |
86 | Incremental_inputs_header_write(unsigned char *p) |
87 | : p_(reinterpret_cast<internal::Incremental_inputs_header_data*>(p)) | |
0e879927 | 88 | { } |
072fe7ce | 89 | |
3ce2c28e | 90 | static const int data_size = sizeof(internal::Incremental_inputs_header_data); |
0e879927 ILT |
91 | |
92 | void | |
93 | put_version(elfcpp::Elf_Word v) | |
94 | { this->p_->version = Convert<32, big_endian>::convert_host(v); } | |
95 | ||
96 | void | |
3ce2c28e | 97 | put_input_file_count(elfcpp::Elf_Word v) |
0e879927 ILT |
98 | { this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); } |
99 | ||
100 | void | |
3ce2c28e | 101 | put_command_line_offset(elfcpp::Elf_Word v) |
0e879927 ILT |
102 | { this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); } |
103 | ||
104 | void | |
3ce2c28e | 105 | put_reserved(elfcpp::Elf_Word v) |
0e879927 ILT |
106 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } |
107 | ||
108 | private: | |
3ce2c28e | 109 | internal::Incremental_inputs_header_data* p_; |
0e879927 ILT |
110 | }; |
111 | ||
112 | // See internal::Incremental_input_entry for fields descriptions. | |
113 | template<int size, bool big_endian> | |
3ce2c28e | 114 | class Incremental_inputs_entry_write |
0e879927 ILT |
115 | { |
116 | public: | |
3ce2c28e ILT |
117 | Incremental_inputs_entry_write(unsigned char *p) |
118 | : p_(reinterpret_cast<internal::Incremental_inputs_entry_data*>(p)) | |
0e879927 ILT |
119 | { } |
120 | ||
3ce2c28e ILT |
121 | static const int data_size = sizeof(internal::Incremental_inputs_entry_data); |
122 | ||
0e879927 ILT |
123 | void |
124 | put_filename_offset(elfcpp::Elf_Word v) | |
125 | { this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); } | |
126 | ||
127 | void | |
128 | put_data_offset(elfcpp::Elf_Word v) | |
129 | { this->p_->data_offset = Convert<32, big_endian>::convert_host(v); } | |
130 | ||
131 | void | |
132 | put_timestamp_sec(elfcpp::Elf_Word v) | |
133 | { this->p_->timestamp_sec = Convert<32, big_endian>::convert_host(v); } | |
134 | ||
135 | void | |
136 | put_timestamp_usec(elfcpp::Elf_Word v) | |
137 | { this->p_->timestamp_usec = Convert<32, big_endian>::convert_host(v); } | |
138 | ||
139 | void | |
140 | put_input_type(elfcpp::Elf_Word v) | |
141 | { this->p_->input_type = Convert<32, big_endian>::convert_host(v); } | |
142 | ||
143 | void | |
144 | put_reserved(elfcpp::Elf_Word v) | |
145 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } | |
146 | ||
147 | private: | |
3ce2c28e | 148 | internal::Incremental_inputs_entry_data* p_; |
0e879927 ILT |
149 | }; |
150 | ||
3ce2c28e ILT |
151 | // Add the command line to the string table, setting |
152 | // command_line_key_. In incremental builds, the command line is | |
153 | // stored in .gnu_incremental_inputs so that the next linker run can | |
154 | // check if the command line options didn't change. | |
155 | ||
156 | void | |
157 | Incremental_inputs::report_command_line(int argc, const char* const* argv) | |
158 | { | |
159 | // Always store 'gold' as argv[0] to avoid a full relink if the user used a | |
160 | // different path to the linker. | |
161 | std::string args("gold"); | |
162 | // Copied from collect_argv in main.cc. | |
163 | for (int i = 1; i < argc; ++i) | |
164 | { | |
b19b0c6d ILT |
165 | // Adding/removing these options should result in a full relink. |
166 | if (strcmp(argv[i], "--incremental-changed") == 0 | |
167 | || strcmp(argv[i], "--incremental-unchanged") == 0 | |
168 | || strcmp(argv[i], "--incremental-unknown") == 0) | |
169 | continue; | |
170 | ||
3ce2c28e ILT |
171 | args.append(" '"); |
172 | // Now append argv[i], but with all single-quotes escaped | |
173 | const char* argpos = argv[i]; | |
174 | while (1) | |
175 | { | |
176 | const int len = strcspn(argpos, "'"); | |
177 | args.append(argpos, len); | |
178 | if (argpos[len] == '\0') | |
179 | break; | |
180 | args.append("'\"'\"'"); | |
181 | argpos += len + 1; | |
182 | } | |
183 | args.append("'"); | |
184 | } | |
185 | this->strtab_->add(args.c_str(), true, &this->command_line_key_); | |
186 | } | |
187 | ||
072fe7ce ILT |
188 | // Record that the input argument INPUT is an achive ARCHIVE. This is |
189 | // called by Read_symbols after finding out the type of the file. | |
190 | ||
191 | void | |
192 | Incremental_inputs::report_archive(const Input_argument* input, | |
193 | Archive* archive) | |
194 | { | |
195 | Hold_lock hl(*this->lock_); | |
196 | ||
197 | Input_info info; | |
198 | info.type = INCREMENTAL_INPUT_ARCHIVE; | |
199 | info.archive = archive; | |
200 | inputs_map_.insert(std::make_pair(input, info)); | |
201 | } | |
202 | ||
203 | // Record that the input argument INPUT is an object OBJ. This is | |
204 | // called by Read_symbols after finding out the type of the file. | |
205 | ||
206 | void | |
207 | Incremental_inputs::report_object(const Input_argument* input, | |
208 | Object* obj) | |
209 | { | |
210 | Hold_lock hl(*this->lock_); | |
211 | ||
212 | Input_info info; | |
213 | info.type = (obj->is_dynamic() | |
214 | ? INCREMENTAL_INPUT_SHARED_LIBRARY | |
215 | : INCREMENTAL_INPUT_OBJECT); | |
216 | info.object = obj; | |
217 | inputs_map_.insert(std::make_pair(input, info)); | |
218 | } | |
219 | ||
220 | // Record that the input argument INPUT is an script SCRIPT. This is | |
221 | // called by read_script after parsing the script and reading the list | |
222 | // of inputs added by this script. | |
223 | ||
224 | void | |
225 | Incremental_inputs::report_script(const Input_argument* input, | |
226 | Script_info* script) | |
227 | { | |
228 | Hold_lock hl(*this->lock_); | |
229 | ||
230 | Input_info info; | |
231 | info.type = INCREMENTAL_INPUT_SCRIPT; | |
232 | info.script = script; | |
233 | inputs_map_.insert(std::make_pair(input, info)); | |
234 | } | |
235 | ||
236 | // Compute indexes in the order in which the inputs should appear in | |
237 | // .gnu_incremental_inputs. This needs to be done after all the | |
238 | // scripts are parsed. The function is first called for the command | |
239 | // line inputs arguments and may call itself recursively for e.g. a | |
240 | // list of elements of a group or a list of inputs added by a script. | |
241 | // The [BEGIN; END) interval to analyze and *INDEX is the current | |
242 | // value of the index (that will be updated). | |
243 | ||
244 | void | |
245 | Incremental_inputs::finalize_inputs( | |
246 | Input_argument_list::const_iterator begin, | |
247 | Input_argument_list::const_iterator end, | |
248 | unsigned int* index) | |
249 | { | |
250 | for (Input_argument_list::const_iterator p = begin; p != end; ++p) | |
251 | { | |
252 | if (p->is_group()) | |
253 | { | |
254 | finalize_inputs(p->group()->begin(), p->group()->end(), index); | |
255 | continue; | |
256 | } | |
257 | ||
258 | Inputs_info_map::iterator it = inputs_map_.find(&(*p)); | |
259 | // TODO: turn it into an assert when the code will be more stable. | |
260 | if (it == inputs_map_.end()) | |
261 | { | |
262 | gold_error("internal error: %s: incremental build info not provided", | |
263 | (p->is_file() ? p->file().name() : "[group]")); | |
264 | continue; | |
265 | } | |
266 | Input_info* info = &it->second; | |
267 | info->index = *index; | |
268 | (*index)++; | |
269 | this->strtab_->add(p->file().name(), false, &info->filename_key); | |
270 | if (info->type == INCREMENTAL_INPUT_SCRIPT) | |
271 | { | |
272 | finalize_inputs(info->script->inputs()->begin(), | |
273 | info->script->inputs()->end(), | |
274 | index); | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
3ce2c28e ILT |
279 | // Finalize the incremental link information. Called from |
280 | // Layout::finalize. | |
281 | ||
282 | void | |
283 | Incremental_inputs::finalize() | |
284 | { | |
072fe7ce ILT |
285 | unsigned int index = 0; |
286 | finalize_inputs(this->inputs_->begin(), this->inputs_->end(), &index); | |
287 | ||
288 | // Sanity check. | |
289 | for (Inputs_info_map::const_iterator p = inputs_map_.begin(); | |
290 | p != inputs_map_.end(); | |
291 | ++p) | |
292 | { | |
293 | gold_assert(p->second.filename_key != 0); | |
294 | } | |
295 | ||
3ce2c28e ILT |
296 | this->strtab_->set_string_offsets(); |
297 | } | |
298 | ||
299 | // Create the content of the .gnu_incremental_inputs section. | |
300 | ||
301 | Output_section_data* | |
302 | Incremental_inputs::create_incremental_inputs_section_data() | |
303 | { | |
304 | switch (parameters->size_and_endianness()) | |
305 | { | |
306 | #ifdef HAVE_TARGET_32_LITTLE | |
307 | case Parameters::TARGET_32_LITTLE: | |
308 | return this->sized_create_inputs_section_data<32, false>(); | |
309 | #endif | |
310 | #ifdef HAVE_TARGET_32_BIG | |
311 | case Parameters::TARGET_32_BIG: | |
312 | return this->sized_create_inputs_section_data<32, true>(); | |
313 | #endif | |
314 | #ifdef HAVE_TARGET_64_LITTLE | |
315 | case Parameters::TARGET_64_LITTLE: | |
316 | return this->sized_create_inputs_section_data<64, false>(); | |
317 | #endif | |
318 | #ifdef HAVE_TARGET_64_BIG | |
319 | case Parameters::TARGET_64_BIG: | |
320 | return this->sized_create_inputs_section_data<64, true>(); | |
321 | #endif | |
322 | default: | |
323 | gold_unreachable(); | |
072fe7ce | 324 | } |
3ce2c28e ILT |
325 | } |
326 | ||
327 | // Sized creation of .gnu_incremental_inputs section. | |
328 | ||
329 | template<int size, bool big_endian> | |
330 | Output_section_data* | |
331 | Incremental_inputs::sized_create_inputs_section_data() | |
072fe7ce ILT |
332 | { |
333 | const int entry_size = | |
334 | Incremental_inputs_entry_write<size, big_endian>::data_size; | |
335 | const int header_size = | |
3ce2c28e | 336 | Incremental_inputs_header_write<size, big_endian>::data_size; |
072fe7ce ILT |
337 | |
338 | unsigned int sz = header_size + entry_size * this->inputs_map_.size(); | |
3ce2c28e | 339 | unsigned char* buffer = new unsigned char[sz]; |
072fe7ce ILT |
340 | unsigned char* inputs_base = buffer + header_size; |
341 | ||
3ce2c28e | 342 | Incremental_inputs_header_write<size, big_endian> header_writer(buffer); |
3ce2c28e ILT |
343 | gold_assert(this->command_line_key_ > 0); |
344 | int cmd_offset = this->strtab_->get_offset_from_key(this->command_line_key_); | |
072fe7ce | 345 | |
3ce2c28e | 346 | header_writer.put_version(INCREMENTAL_LINK_VERSION); |
072fe7ce | 347 | header_writer.put_input_file_count(this->inputs_map_.size()); |
3ce2c28e ILT |
348 | header_writer.put_command_line_offset(cmd_offset); |
349 | header_writer.put_reserved(0); | |
072fe7ce ILT |
350 | |
351 | for (Inputs_info_map::const_iterator it = this->inputs_map_.begin(); | |
352 | it != this->inputs_map_.end(); | |
353 | ++it) | |
354 | { | |
355 | gold_assert(it->second.index < this->inputs_map_.size()); | |
356 | ||
357 | unsigned char* entry_buffer = | |
358 | inputs_base + it->second.index * entry_size; | |
359 | Incremental_inputs_entry_write<size, big_endian> entry(entry_buffer); | |
360 | int filename_offset = | |
361 | this->strtab_->get_offset_from_key(it->second.filename_key); | |
362 | entry.put_filename_offset(filename_offset); | |
363 | // TODO: add per input data and timestamp. Currently we store | |
364 | // an out-of-bounds offset for future version of gold to reject | |
365 | // such an incremental_inputs section. | |
366 | entry.put_data_offset(0xffffffff); | |
367 | entry.put_timestamp_sec(0); | |
368 | entry.put_timestamp_usec(0); | |
369 | entry.put_input_type(it->second.type); | |
370 | entry.put_reserved(0); | |
371 | } | |
372 | ||
3ce2c28e | 373 | return new Output_data_const_buffer(buffer, sz, 8, |
072fe7ce | 374 | "** incremental link inputs list"); |
3ce2c28e ILT |
375 | } |
376 | ||
0e879927 | 377 | } // End namespace gold. |