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5a6f7e2d ILT |
1 | // main.cc -- gold main function. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
6cb15b7f ILT |
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 | ||
5a6f7e2d ILT |
23 | #include "gold.h" |
24 | ||
7d9e3d98 | 25 | #include <cstdio> |
04bf7072 ILT |
26 | #include <cstring> |
27 | ||
e44fcf3b ILT |
28 | #ifdef HAVE_MALLINFO |
29 | #include <malloc.h> | |
30 | #endif | |
04bf7072 | 31 | |
e44fcf3b ILT |
32 | #include "libiberty.h" |
33 | ||
e5756efb | 34 | #include "script.h" |
5a6f7e2d | 35 | #include "options.h" |
7e1edb90 | 36 | #include "parameters.h" |
75f2446e | 37 | #include "errors.h" |
7d9e3d98 | 38 | #include "mapfile.h" |
5a6f7e2d ILT |
39 | #include "dirsearch.h" |
40 | #include "workqueue.h" | |
41 | #include "object.h" | |
ac45a351 | 42 | #include "archive.h" |
5a6f7e2d ILT |
43 | #include "symtab.h" |
44 | #include "layout.h" | |
89fc3421 | 45 | #include "plugin.h" |
6d03d481 | 46 | #include "gc.h" |
ef15dade | 47 | #include "icf.h" |
3ce2c28e | 48 | #include "incremental.h" |
5a6f7e2d ILT |
49 | |
50 | using namespace gold; | |
51 | ||
cbcc4140 ILT |
52 | // This function emits the commandline to a hard-coded file in temp. |
53 | // This is useful for debugging since ld is typically invoked by gcc, | |
54 | // so its commandline is not always easy to extract. You should be | |
55 | // able to run 'gcc -B... foo.o -o foo' to invoke this linker the | |
56 | // first time, and then /tmp/ld-run-foo.sh to invoke it on subsequent | |
57 | // runes. "/tmp/ld-run-foo.sh debug" will run the linker inside gdb | |
58 | // (or whatever value the environment variable GDB is set to), for | |
59 | // even easier debugging. Since this is a debugging-only tool, and | |
60 | // creates files, it is only turned on when the user explicitly asks | |
61 | // for it, by compiling with -DDEBUG. Do not do this for release | |
62 | // versions of the linker! | |
63 | ||
64 | #ifdef DEBUG | |
65 | #include <stdio.h> | |
66 | #include <sys/stat.h> // for chmod() | |
67 | ||
68 | static std::string | |
69 | collect_argv(int argc, char** argv) | |
70 | { | |
71 | // This is used by write_debug_script(), which wants the unedited argv. | |
72 | std::string args; | |
73 | for (int i = 0; i < argc; ++i) | |
74 | { | |
75 | args.append(" '"); | |
76 | // Now append argv[i], but with all single-quotes escaped | |
77 | const char* argpos = argv[i]; | |
78 | while (1) | |
79 | { | |
80 | const int len = strcspn(argpos, "'"); | |
81 | args.append(argpos, len); | |
82 | if (argpos[len] == '\0') | |
83 | break; | |
84 | args.append("'\"'\"'"); | |
85 | argpos += len + 1; | |
86 | } | |
87 | args.append("'"); | |
88 | } | |
89 | return args; | |
90 | } | |
91 | ||
92 | static void | |
93 | write_debug_script(std::string filename_str, | |
94 | const char* argv_0, const char* args) | |
95 | { | |
96 | size_t slash = filename_str.rfind('/'); | |
97 | if (slash != std::string::npos) | |
98 | filename_str = filename_str.c_str() + slash + 1; | |
55a93433 | 99 | filename_str = std::string("/tmp/ld-run-") + filename_str + ".sh"; |
cbcc4140 ILT |
100 | const char* filename = filename_str.c_str(); |
101 | FILE* fp = fopen(filename, "w"); | |
102 | if (fp) | |
103 | { | |
fc955173 ILT |
104 | fprintf(fp, "[ \"$1\" = debug ]" |
105 | " && PREFIX=\"${GDB-gdb} --annotate=3 --fullname %s --args\"" | |
106 | " && shift\n", | |
107 | argv_0); | |
cbcc4140 ILT |
108 | fprintf(fp, "$PREFIX%s $*\n", args); |
109 | fclose(fp); | |
110 | chmod(filename, 0755); | |
111 | } | |
112 | else | |
113 | filename = "[none]"; | |
114 | fprintf(stderr, "Welcome to gold! Commandline written to %s.\n", filename); | |
115 | fflush(stderr); | |
116 | } | |
117 | ||
118 | #else // !defined(DEBUG) | |
119 | ||
120 | static inline std::string | |
121 | collect_argv(int, char**) | |
122 | { | |
123 | return ""; | |
124 | } | |
125 | ||
126 | static inline void | |
127 | write_debug_script(std::string, const char*, const char*) | |
128 | { | |
129 | } | |
130 | ||
131 | #endif // !defined(DEBUG) | |
132 | ||
133 | ||
5a6f7e2d ILT |
134 | int |
135 | main(int argc, char** argv) | |
136 | { | |
137 | #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) | |
138 | setlocale (LC_MESSAGES, ""); | |
139 | #endif | |
140 | #if defined (HAVE_SETLOCALE) | |
141 | setlocale (LC_CTYPE, ""); | |
142 | #endif | |
143 | bindtextdomain (PACKAGE, LOCALEDIR); | |
144 | textdomain (PACKAGE); | |
145 | ||
146 | program_name = argv[0]; | |
147 | ||
fc955173 ILT |
148 | // In libiberty; expands @filename to the args in "filename". |
149 | expandargv(&argc, &argv); | |
150 | ||
cbcc4140 ILT |
151 | // This is used by write_debug_script(), which wants the unedited argv. |
152 | std::string args = collect_argv(argc, argv); | |
153 | ||
75f2446e ILT |
154 | Errors errors(program_name); |
155 | ||
3c2fafa5 ILT |
156 | // Initialize the global parameters, to let random code get to the |
157 | // errors object. | |
8851ecca | 158 | set_parameters_errors(&errors); |
3c2fafa5 | 159 | |
5a6f7e2d | 160 | // Handle the command line options. |
a5dc0706 | 161 | Command_line command_line; |
ee1fe73e | 162 | command_line.process(argc - 1, const_cast<const char**>(argv + 1)); |
e44fcf3b ILT |
163 | |
164 | long start_time = 0; | |
7cc619c3 | 165 | if (command_line.options().stats()) |
e44fcf3b ILT |
166 | start_time = get_run_time(); |
167 | ||
3c2fafa5 | 168 | // Store some options in the globally accessible parameters. |
8851ecca | 169 | set_parameters_options(&command_line.options()); |
5a6f7e2d | 170 | |
cbcc4140 ILT |
171 | // Do this as early as possible (since it prints a welcome message). |
172 | write_debug_script(command_line.options().output_file_name(), | |
173 | program_name, args.c_str()); | |
174 | ||
7d9e3d98 ILT |
175 | // If the user asked for a map file, open it. |
176 | Mapfile* mapfile = NULL; | |
177 | if (command_line.options().user_set_Map()) | |
178 | { | |
179 | mapfile = new Mapfile(); | |
180 | if (!mapfile->open(command_line.options().Map())) | |
181 | { | |
182 | delete mapfile; | |
183 | mapfile = NULL; | |
184 | } | |
185 | } | |
186 | ||
1ef1f3d3 ILT |
187 | // The GNU linker ignores version scripts when generating |
188 | // relocatable output. If we are not compatible, then we break the | |
189 | // Linux kernel build, which uses a linker script with -r which must | |
190 | // not force symbols to be local. It would actually be useful to | |
191 | // permit symbols to be forced local with -r, though, as it would | |
192 | // permit some linker optimizations. Perhaps we need yet another | |
193 | // option to control this. FIXME. | |
8851ecca | 194 | if (parameters->options().relocatable()) |
a5dc0706 | 195 | command_line.script_options().version_script_info()->clear(); |
1ef1f3d3 | 196 | |
89fc3421 CC |
197 | // Load plugin libraries. |
198 | if (command_line.options().has_plugins()) | |
199 | command_line.options().plugins()->load_plugins(); | |
200 | ||
5a6f7e2d ILT |
201 | // The work queue. |
202 | Workqueue workqueue(command_line.options()); | |
203 | ||
204 | // The list of input objects. | |
205 | Input_objects input_objects; | |
206 | ||
ef15dade | 207 | // The Garbage Collection (GC, --gc-sections) Object. |
6d03d481 ST |
208 | Garbage_collection gc; |
209 | ||
ef15dade ST |
210 | // The Identical Code Folding (ICF, --icf) Object. |
211 | Icf icf; | |
212 | ||
6d013333 ILT |
213 | // The symbol table. We're going to guess here how many symbols |
214 | // we're going to see based on the number of input files. Even when | |
cbcc4140 | 215 | // this is off, it means at worst we don't quite optimize hashtable |
6d013333 | 216 | // resizing as well as we could have (perhap using more memory). |
09124467 | 217 | Symbol_table symtab(command_line.number_of_input_files() * 1024, |
a5dc0706 | 218 | command_line.version_script()); |
5a6f7e2d | 219 | |
6d03d481 ST |
220 | if (parameters->options().gc_sections()) |
221 | symtab.set_gc(&gc); | |
222 | ||
032ce4e9 | 223 | if (parameters->options().icf_enabled()) |
ef15dade ST |
224 | symtab.set_icf(&icf); |
225 | ||
5a6f7e2d | 226 | // The layout object. |
e55bde5e ILT |
227 | Layout layout(command_line.number_of_input_files(), |
228 | &command_line.script_options()); | |
5a6f7e2d | 229 | |
3ce2c28e | 230 | if (layout.incremental_inputs() != NULL) |
072fe7ce ILT |
231 | { |
232 | layout.incremental_inputs()->report_command_line(argc, argv); | |
233 | layout.incremental_inputs()->report_inputs(command_line.inputs()); | |
234 | } | |
3ce2c28e | 235 | |
5a6f7e2d ILT |
236 | // Get the search path from the -L options. |
237 | Dirsearch search_path; | |
7cc619c3 | 238 | search_path.initialize(&workqueue, &command_line.options().library_path()); |
5a6f7e2d ILT |
239 | |
240 | // Queue up the first set of tasks. | |
241 | queue_initial_tasks(command_line.options(), search_path, | |
242 | command_line, &workqueue, &input_objects, | |
7d9e3d98 | 243 | &symtab, &layout, mapfile); |
5a6f7e2d ILT |
244 | |
245 | // Run the main task processing loop. | |
17a1d0a9 | 246 | workqueue.process(0); |
5a6f7e2d | 247 | |
7cc619c3 | 248 | if (command_line.options().stats()) |
e44fcf3b ILT |
249 | { |
250 | long run_time = get_run_time() - start_time; | |
251 | fprintf(stderr, _("%s: total run time: %ld.%06ld seconds\n"), | |
252 | program_name, run_time / 1000000, run_time % 1000000); | |
253 | #ifdef HAVE_MALLINFO | |
254 | struct mallinfo m = mallinfo(); | |
255 | fprintf(stderr, _("%s: total space allocated by malloc: %d bytes\n"), | |
256 | program_name, m.arena); | |
257 | #endif | |
258 | File_read::print_stats(); | |
ac45a351 | 259 | Archive::print_stats(); |
e44fcf3b ILT |
260 | fprintf(stderr, _("%s: output file size: %lld bytes\n"), |
261 | program_name, static_cast<long long>(layout.output_file_size())); | |
abaa3995 | 262 | symtab.print_stats(); |
ad8f37d1 | 263 | layout.print_stats(); |
e44fcf3b ILT |
264 | } |
265 | ||
7d9e3d98 ILT |
266 | if (mapfile != NULL) |
267 | mapfile->close(); | |
268 | ||
92de84a6 ILT |
269 | // Issue defined symbol report. |
270 | if (command_line.options().user_set_print_symbol_counts()) | |
271 | input_objects.print_symbol_counts(&symtab); | |
272 | ||
d82a5bcc ILT |
273 | if (parameters->options().fatal_warnings() |
274 | && errors.warning_count() > 0 | |
275 | && errors.error_count() == 0) | |
276 | gold_error("treating warnings as errors"); | |
277 | ||
cdb0b8f5 ILT |
278 | // If the user used --noinhibit-exec, we force the exit status to be |
279 | // successful. This is compatible with GNU ld. | |
280 | gold_exit(errors.error_count() == 0 | |
281 | || parameters->options().noinhibit_exec()); | |
5a6f7e2d | 282 | } |