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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" | |
98fa85cb | 27 | #include "archive.h" |
0e879927 ILT |
28 | |
29 | using elfcpp::Convert; | |
30 | ||
31 | namespace gold { | |
32 | ||
33 | // Version information. Will change frequently during the development, later | |
34 | // we could think about backward (and forward?) compatibility. | |
35 | const int INCREMENTAL_LINK_VERSION = 1; | |
36 | ||
37 | namespace internal { | |
38 | ||
39 | // Header of the .gnu_incremental_input section. | |
3ce2c28e | 40 | struct Incremental_inputs_header_data |
0e879927 ILT |
41 | { |
42 | // Incremental linker version. | |
43 | elfcpp::Elf_Word version; | |
44 | ||
45 | // Numer of input files in the link. | |
46 | elfcpp::Elf_Word input_file_count; | |
47 | ||
48 | // Offset of command line options in .gnu_incremental_strtab. | |
49 | elfcpp::Elf_Word command_line_offset; | |
50 | ||
51 | // Padding. | |
52 | elfcpp::Elf_Word reserved; | |
53 | }; | |
54 | ||
55 | // Data stored in .gnu_incremental_input after the header for each of the | |
56 | // Incremental_input_header_data::input_file_count input entries. | |
3ce2c28e | 57 | struct Incremental_inputs_entry_data |
0e879927 ILT |
58 | { |
59 | // Offset of file name in .gnu_incremental_strtab section. | |
60 | elfcpp::Elf_Word filename_offset; | |
61 | ||
62 | // Offset of data in .gnu_incremental_input. | |
63 | elfcpp::Elf_Word data_offset; | |
64 | ||
65 | // Timestamp (in seconds). | |
66 | elfcpp::Elf_Xword timestamp_sec; | |
67 | ||
68 | // Nano-second part of timestamp (if supported). | |
98fa85cb | 69 | elfcpp::Elf_Word timestamp_nsec; |
0e879927 ILT |
70 | |
71 | // Type of the input entry. | |
72 | elfcpp::Elf_Half input_type; | |
73 | ||
74 | // Padding. | |
75 | elfcpp::Elf_Half reserved; | |
76 | }; | |
77 | ||
78 | } | |
79 | ||
80 | // Accessors. | |
81 | ||
82 | // See internal::Incremental_input_header for fields descriptions. | |
83 | template<int size, bool big_endian> | |
3ce2c28e | 84 | class Incremental_inputs_header_write |
0e879927 ILT |
85 | { |
86 | public: | |
3ce2c28e ILT |
87 | Incremental_inputs_header_write(unsigned char *p) |
88 | : p_(reinterpret_cast<internal::Incremental_inputs_header_data*>(p)) | |
0e879927 | 89 | { } |
072fe7ce | 90 | |
3ce2c28e | 91 | static const int data_size = sizeof(internal::Incremental_inputs_header_data); |
0e879927 ILT |
92 | |
93 | void | |
94 | put_version(elfcpp::Elf_Word v) | |
95 | { this->p_->version = Convert<32, big_endian>::convert_host(v); } | |
96 | ||
97 | void | |
3ce2c28e | 98 | put_input_file_count(elfcpp::Elf_Word v) |
0e879927 ILT |
99 | { this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); } |
100 | ||
101 | void | |
3ce2c28e | 102 | put_command_line_offset(elfcpp::Elf_Word v) |
0e879927 ILT |
103 | { this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); } |
104 | ||
105 | void | |
3ce2c28e | 106 | put_reserved(elfcpp::Elf_Word v) |
0e879927 ILT |
107 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } |
108 | ||
109 | private: | |
3ce2c28e | 110 | internal::Incremental_inputs_header_data* p_; |
0e879927 ILT |
111 | }; |
112 | ||
113 | // See internal::Incremental_input_entry for fields descriptions. | |
114 | template<int size, bool big_endian> | |
3ce2c28e | 115 | class Incremental_inputs_entry_write |
0e879927 ILT |
116 | { |
117 | public: | |
3ce2c28e ILT |
118 | Incremental_inputs_entry_write(unsigned char *p) |
119 | : p_(reinterpret_cast<internal::Incremental_inputs_entry_data*>(p)) | |
0e879927 ILT |
120 | { } |
121 | ||
3ce2c28e ILT |
122 | static const int data_size = sizeof(internal::Incremental_inputs_entry_data); |
123 | ||
0e879927 ILT |
124 | void |
125 | put_filename_offset(elfcpp::Elf_Word v) | |
126 | { this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); } | |
127 | ||
128 | void | |
129 | put_data_offset(elfcpp::Elf_Word v) | |
130 | { this->p_->data_offset = Convert<32, big_endian>::convert_host(v); } | |
131 | ||
132 | void | |
98fa85cb ILT |
133 | put_timestamp_sec(elfcpp::Elf_Xword v) |
134 | { this->p_->timestamp_sec = Convert<64, big_endian>::convert_host(v); } | |
0e879927 ILT |
135 | |
136 | void | |
98fa85cb ILT |
137 | put_timestamp_nsec(elfcpp::Elf_Word v) |
138 | { this->p_->timestamp_nsec = Convert<32, big_endian>::convert_host(v); } | |
0e879927 ILT |
139 | |
140 | void | |
141 | put_input_type(elfcpp::Elf_Word v) | |
142 | { this->p_->input_type = Convert<32, big_endian>::convert_host(v); } | |
143 | ||
144 | void | |
145 | put_reserved(elfcpp::Elf_Word v) | |
146 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } | |
147 | ||
148 | private: | |
3ce2c28e | 149 | internal::Incremental_inputs_entry_data* p_; |
0e879927 ILT |
150 | }; |
151 | ||
3ce2c28e ILT |
152 | // Add the command line to the string table, setting |
153 | // command_line_key_. In incremental builds, the command line is | |
154 | // stored in .gnu_incremental_inputs so that the next linker run can | |
155 | // check if the command line options didn't change. | |
156 | ||
157 | void | |
158 | Incremental_inputs::report_command_line(int argc, const char* const* argv) | |
159 | { | |
160 | // Always store 'gold' as argv[0] to avoid a full relink if the user used a | |
161 | // different path to the linker. | |
162 | std::string args("gold"); | |
163 | // Copied from collect_argv in main.cc. | |
164 | for (int i = 1; i < argc; ++i) | |
165 | { | |
b19b0c6d ILT |
166 | // Adding/removing these options should result in a full relink. |
167 | if (strcmp(argv[i], "--incremental-changed") == 0 | |
168 | || strcmp(argv[i], "--incremental-unchanged") == 0 | |
169 | || strcmp(argv[i], "--incremental-unknown") == 0) | |
170 | continue; | |
171 | ||
3ce2c28e ILT |
172 | args.append(" '"); |
173 | // Now append argv[i], but with all single-quotes escaped | |
174 | const char* argpos = argv[i]; | |
175 | while (1) | |
176 | { | |
177 | const int len = strcspn(argpos, "'"); | |
178 | args.append(argpos, len); | |
179 | if (argpos[len] == '\0') | |
180 | break; | |
181 | args.append("'\"'\"'"); | |
182 | argpos += len + 1; | |
183 | } | |
184 | args.append("'"); | |
185 | } | |
186 | this->strtab_->add(args.c_str(), true, &this->command_line_key_); | |
187 | } | |
188 | ||
072fe7ce ILT |
189 | // Record that the input argument INPUT is an achive ARCHIVE. This is |
190 | // called by Read_symbols after finding out the type of the file. | |
191 | ||
192 | void | |
193 | Incremental_inputs::report_archive(const Input_argument* input, | |
194 | Archive* archive) | |
195 | { | |
196 | Hold_lock hl(*this->lock_); | |
197 | ||
198 | Input_info info; | |
199 | info.type = INCREMENTAL_INPUT_ARCHIVE; | |
200 | info.archive = archive; | |
98fa85cb ILT |
201 | info.mtime = archive->file().get_mtime(); |
202 | this->inputs_map_.insert(std::make_pair(input, info)); | |
072fe7ce ILT |
203 | } |
204 | ||
205 | // Record that the input argument INPUT is an object OBJ. This is | |
206 | // called by Read_symbols after finding out the type of the file. | |
207 | ||
208 | void | |
209 | Incremental_inputs::report_object(const Input_argument* input, | |
210 | Object* obj) | |
211 | { | |
212 | Hold_lock hl(*this->lock_); | |
213 | ||
214 | Input_info info; | |
215 | info.type = (obj->is_dynamic() | |
216 | ? INCREMENTAL_INPUT_SHARED_LIBRARY | |
217 | : INCREMENTAL_INPUT_OBJECT); | |
218 | info.object = obj; | |
98fa85cb ILT |
219 | info.mtime = obj->input_file()->file().get_mtime(); |
220 | this->inputs_map_.insert(std::make_pair(input, info)); | |
072fe7ce ILT |
221 | } |
222 | ||
223 | // Record that the input argument INPUT is an script SCRIPT. This is | |
224 | // called by read_script after parsing the script and reading the list | |
225 | // of inputs added by this script. | |
226 | ||
227 | void | |
228 | Incremental_inputs::report_script(const Input_argument* input, | |
98fa85cb | 229 | Timespec mtime, |
072fe7ce ILT |
230 | Script_info* script) |
231 | { | |
232 | Hold_lock hl(*this->lock_); | |
233 | ||
234 | Input_info info; | |
235 | info.type = INCREMENTAL_INPUT_SCRIPT; | |
236 | info.script = script; | |
98fa85cb ILT |
237 | info.mtime = mtime; |
238 | this->inputs_map_.insert(std::make_pair(input, info)); | |
072fe7ce ILT |
239 | } |
240 | ||
241 | // Compute indexes in the order in which the inputs should appear in | |
242 | // .gnu_incremental_inputs. This needs to be done after all the | |
243 | // scripts are parsed. The function is first called for the command | |
244 | // line inputs arguments and may call itself recursively for e.g. a | |
245 | // list of elements of a group or a list of inputs added by a script. | |
246 | // The [BEGIN; END) interval to analyze and *INDEX is the current | |
247 | // value of the index (that will be updated). | |
248 | ||
249 | void | |
250 | Incremental_inputs::finalize_inputs( | |
251 | Input_argument_list::const_iterator begin, | |
252 | Input_argument_list::const_iterator end, | |
253 | unsigned int* index) | |
254 | { | |
255 | for (Input_argument_list::const_iterator p = begin; p != end; ++p) | |
256 | { | |
257 | if (p->is_group()) | |
258 | { | |
259 | finalize_inputs(p->group()->begin(), p->group()->end(), index); | |
260 | continue; | |
261 | } | |
262 | ||
98fa85cb | 263 | Inputs_info_map::iterator it = this->inputs_map_.find(&(*p)); |
072fe7ce | 264 | // TODO: turn it into an assert when the code will be more stable. |
98fa85cb | 265 | if (it == this->inputs_map_.end()) |
072fe7ce ILT |
266 | { |
267 | gold_error("internal error: %s: incremental build info not provided", | |
268 | (p->is_file() ? p->file().name() : "[group]")); | |
269 | continue; | |
270 | } | |
271 | Input_info* info = &it->second; | |
272 | info->index = *index; | |
273 | (*index)++; | |
274 | this->strtab_->add(p->file().name(), false, &info->filename_key); | |
275 | if (info->type == INCREMENTAL_INPUT_SCRIPT) | |
276 | { | |
277 | finalize_inputs(info->script->inputs()->begin(), | |
278 | info->script->inputs()->end(), | |
279 | index); | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
3ce2c28e ILT |
284 | // Finalize the incremental link information. Called from |
285 | // Layout::finalize. | |
286 | ||
287 | void | |
288 | Incremental_inputs::finalize() | |
289 | { | |
072fe7ce ILT |
290 | unsigned int index = 0; |
291 | finalize_inputs(this->inputs_->begin(), this->inputs_->end(), &index); | |
292 | ||
293 | // Sanity check. | |
98fa85cb ILT |
294 | for (Inputs_info_map::const_iterator p = this->inputs_map_.begin(); |
295 | p != this->inputs_map_.end(); | |
072fe7ce ILT |
296 | ++p) |
297 | { | |
298 | gold_assert(p->second.filename_key != 0); | |
299 | } | |
300 | ||
3ce2c28e ILT |
301 | this->strtab_->set_string_offsets(); |
302 | } | |
303 | ||
304 | // Create the content of the .gnu_incremental_inputs section. | |
305 | ||
306 | Output_section_data* | |
307 | Incremental_inputs::create_incremental_inputs_section_data() | |
308 | { | |
309 | switch (parameters->size_and_endianness()) | |
310 | { | |
311 | #ifdef HAVE_TARGET_32_LITTLE | |
312 | case Parameters::TARGET_32_LITTLE: | |
313 | return this->sized_create_inputs_section_data<32, false>(); | |
314 | #endif | |
315 | #ifdef HAVE_TARGET_32_BIG | |
316 | case Parameters::TARGET_32_BIG: | |
317 | return this->sized_create_inputs_section_data<32, true>(); | |
318 | #endif | |
319 | #ifdef HAVE_TARGET_64_LITTLE | |
320 | case Parameters::TARGET_64_LITTLE: | |
321 | return this->sized_create_inputs_section_data<64, false>(); | |
322 | #endif | |
323 | #ifdef HAVE_TARGET_64_BIG | |
324 | case Parameters::TARGET_64_BIG: | |
325 | return this->sized_create_inputs_section_data<64, true>(); | |
326 | #endif | |
327 | default: | |
328 | gold_unreachable(); | |
072fe7ce | 329 | } |
3ce2c28e ILT |
330 | } |
331 | ||
332 | // Sized creation of .gnu_incremental_inputs section. | |
333 | ||
334 | template<int size, bool big_endian> | |
335 | Output_section_data* | |
336 | Incremental_inputs::sized_create_inputs_section_data() | |
072fe7ce ILT |
337 | { |
338 | const int entry_size = | |
339 | Incremental_inputs_entry_write<size, big_endian>::data_size; | |
340 | const int header_size = | |
3ce2c28e | 341 | Incremental_inputs_header_write<size, big_endian>::data_size; |
072fe7ce ILT |
342 | |
343 | unsigned int sz = header_size + entry_size * this->inputs_map_.size(); | |
3ce2c28e | 344 | unsigned char* buffer = new unsigned char[sz]; |
072fe7ce ILT |
345 | unsigned char* inputs_base = buffer + header_size; |
346 | ||
3ce2c28e | 347 | Incremental_inputs_header_write<size, big_endian> header_writer(buffer); |
3ce2c28e ILT |
348 | gold_assert(this->command_line_key_ > 0); |
349 | int cmd_offset = this->strtab_->get_offset_from_key(this->command_line_key_); | |
072fe7ce | 350 | |
3ce2c28e | 351 | header_writer.put_version(INCREMENTAL_LINK_VERSION); |
072fe7ce | 352 | header_writer.put_input_file_count(this->inputs_map_.size()); |
3ce2c28e ILT |
353 | header_writer.put_command_line_offset(cmd_offset); |
354 | header_writer.put_reserved(0); | |
072fe7ce ILT |
355 | |
356 | for (Inputs_info_map::const_iterator it = this->inputs_map_.begin(); | |
357 | it != this->inputs_map_.end(); | |
358 | ++it) | |
359 | { | |
360 | gold_assert(it->second.index < this->inputs_map_.size()); | |
361 | ||
362 | unsigned char* entry_buffer = | |
363 | inputs_base + it->second.index * entry_size; | |
364 | Incremental_inputs_entry_write<size, big_endian> entry(entry_buffer); | |
365 | int filename_offset = | |
366 | this->strtab_->get_offset_from_key(it->second.filename_key); | |
367 | entry.put_filename_offset(filename_offset); | |
368 | // TODO: add per input data and timestamp. Currently we store | |
369 | // an out-of-bounds offset for future version of gold to reject | |
370 | // such an incremental_inputs section. | |
371 | entry.put_data_offset(0xffffffff); | |
98fa85cb ILT |
372 | entry.put_timestamp_sec(it->second.mtime.seconds); |
373 | entry.put_timestamp_nsec(it->second.mtime.nanoseconds); | |
072fe7ce ILT |
374 | entry.put_input_type(it->second.type); |
375 | entry.put_reserved(0); | |
376 | } | |
377 | ||
3ce2c28e | 378 | return new Output_data_const_buffer(buffer, sz, 8, |
072fe7ce | 379 | "** incremental link inputs list"); |
3ce2c28e ILT |
380 | } |
381 | ||
0e879927 | 382 | } // End namespace gold. |