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4efc6507 DE |
1 | /* Handle JIT code generation in the inferior for GDB, the GNU Debugger. |
2 | ||
4a94e368 | 3 | Copyright (C) 2009-2022 Free Software Foundation, Inc. |
4efc6507 DE |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | ||
22 | #include "jit.h" | |
f997c383 | 23 | #include "jit-reader.h" |
1825a88d | 24 | #include "block.h" |
4efc6507 | 25 | #include "breakpoint.h" |
a255712f | 26 | #include "command.h" |
1825a88d | 27 | #include "dictionary.h" |
c9fb1240 | 28 | #include "filenames.h" |
1825a88d | 29 | #include "frame-unwind.h" |
a255712f | 30 | #include "gdbcmd.h" |
4efc6507 | 31 | #include "gdbcore.h" |
03673fc7 | 32 | #include "inferior.h" |
76727919 | 33 | #include "observable.h" |
4efc6507 | 34 | #include "objfiles.h" |
3623dc3a | 35 | #include "regcache.h" |
4efc6507 DE |
36 | #include "symfile.h" |
37 | #include "symtab.h" | |
38 | #include "target.h" | |
2d41fa11 | 39 | #include "gdbsupport/gdb-dlfcn.h" |
53ce3c39 | 40 | #include <sys/stat.h> |
cbb099e8 | 41 | #include "gdb_bfd.h" |
6571a381 TT |
42 | #include "readline/tilde.h" |
43 | #include "completer.h" | |
1b61f46d | 44 | #include <forward_list> |
4efc6507 | 45 | |
f2aec7f6 | 46 | static std::string jit_reader_dir; |
b8e0a31c | 47 | |
db92ac45 | 48 | static const char jit_break_name[] = "__jit_debug_register_code"; |
4efc6507 | 49 | |
db92ac45 | 50 | static const char jit_descriptor_name[] = "__jit_debug_descriptor"; |
4efc6507 | 51 | |
42a4fec5 | 52 | static void jit_inferior_created_hook (inferior *inf); |
20aa2c60 | 53 | static void jit_inferior_exit_hook (struct inferior *inf); |
3b2a0cf2 | 54 | |
3623dc3a SD |
55 | /* An unwinder is registered for every gdbarch. This key is used to |
56 | remember if the unwinder has been registered for a particular | |
57 | gdbarch. */ | |
58 | ||
59 | static struct gdbarch_data *jit_gdbarch_data; | |
60 | ||
062eaacb | 61 | /* True if we want to see trace of jit level stuff. */ |
a255712f | 62 | |
062eaacb | 63 | static bool jit_debug = false; |
a255712f | 64 | |
54ca9002 SM |
65 | /* Print a "jit" debug statement. */ |
66 | ||
67 | #define jit_debug_printf(fmt, ...) \ | |
68 | debug_prefixed_printf_cond (jit_debug, "jit", fmt, ##__VA_ARGS__) | |
69 | ||
a255712f PP |
70 | static void |
71 | show_jit_debug (struct ui_file *file, int from_tty, | |
72 | struct cmd_list_element *c, const char *value) | |
73 | { | |
74 | fprintf_filtered (file, _("JIT debugging is %s.\n"), value); | |
75 | } | |
76 | ||
ff770835 SM |
77 | /* Implementation of the "maintenance info jit" command. */ |
78 | ||
79 | static void | |
80 | maint_info_jit_cmd (const char *args, int from_tty) | |
81 | { | |
82 | inferior *inf = current_inferior (); | |
83 | bool printed_header = false; | |
84 | ||
85 | /* Print a line for each JIT-ed objfile. */ | |
86 | for (objfile *obj : inf->pspace->objfiles ()) | |
87 | { | |
88 | if (obj->jited_data == nullptr) | |
89 | continue; | |
90 | ||
91 | if (!printed_header) | |
92 | { | |
93 | printf_filtered ("Base address of known JIT-ed objfiles:\n"); | |
94 | printed_header = true; | |
95 | } | |
96 | ||
97 | printf_filtered (" %s\n", paddress (obj->arch (), obj->jited_data->addr)); | |
98 | } | |
99 | } | |
100 | ||
0e8621a0 TT |
101 | struct jit_reader |
102 | { | |
103 | jit_reader (struct gdb_reader_funcs *f, gdb_dlhandle_up &&h) | |
104 | : functions (f), handle (std::move (h)) | |
105 | { | |
106 | } | |
107 | ||
108 | ~jit_reader () | |
109 | { | |
110 | functions->destroy (functions); | |
111 | } | |
112 | ||
d6541620 | 113 | DISABLE_COPY_AND_ASSIGN (jit_reader); |
0e8621a0 TT |
114 | |
115 | struct gdb_reader_funcs *functions; | |
116 | gdb_dlhandle_up handle; | |
117 | }; | |
118 | ||
784c47ee SD |
119 | /* One reader that has been loaded successfully, and can potentially be used to |
120 | parse debug info. */ | |
121 | ||
0e8621a0 | 122 | static struct jit_reader *loaded_jit_reader = NULL; |
784c47ee SD |
123 | |
124 | typedef struct gdb_reader_funcs * (reader_init_fn_type) (void); | |
db92ac45 | 125 | static const char reader_init_fn_sym[] = "gdb_init_reader"; |
784c47ee SD |
126 | |
127 | /* Try to load FILE_NAME as a JIT debug info reader. */ | |
128 | ||
129 | static struct jit_reader * | |
130 | jit_reader_load (const char *file_name) | |
131 | { | |
784c47ee | 132 | reader_init_fn_type *init_fn; |
784c47ee | 133 | struct gdb_reader_funcs *funcs = NULL; |
784c47ee | 134 | |
54ca9002 SM |
135 | jit_debug_printf ("Opening shared object %s", file_name); |
136 | ||
0e8621a0 | 137 | gdb_dlhandle_up so = gdb_dlopen (file_name); |
784c47ee | 138 | |
15cf126c | 139 | init_fn = (reader_init_fn_type *) gdb_dlsym (so, reader_init_fn_sym); |
784c47ee SD |
140 | if (!init_fn) |
141 | error (_("Could not locate initialization function: %s."), | |
3a90f266 | 142 | reader_init_fn_sym); |
784c47ee SD |
143 | |
144 | if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL) | |
145 | error (_("Reader not GPL compatible.")); | |
146 | ||
147 | funcs = init_fn (); | |
148 | if (funcs->reader_version != GDB_READER_INTERFACE_VERSION) | |
149 | error (_("Reader version does not match GDB version.")); | |
150 | ||
0e8621a0 | 151 | return new jit_reader (funcs, std::move (so)); |
784c47ee SD |
152 | } |
153 | ||
154 | /* Provides the jit-reader-load command. */ | |
155 | ||
156 | static void | |
0b39b52e | 157 | jit_reader_load_command (const char *args, int from_tty) |
784c47ee | 158 | { |
784c47ee SD |
159 | if (args == NULL) |
160 | error (_("No reader name provided.")); | |
7c218e6c | 161 | gdb::unique_xmalloc_ptr<char> file (tilde_expand (args)); |
784c47ee SD |
162 | |
163 | if (loaded_jit_reader != NULL) | |
164 | error (_("JIT reader already loaded. Run jit-reader-unload first.")); | |
165 | ||
7c218e6c | 166 | if (!IS_ABSOLUTE_PATH (file.get ())) |
8579fd13 AB |
167 | file = xstrprintf ("%s%s%s", jit_reader_dir.c_str (), |
168 | SLASH_STRING, file.get ()); | |
784c47ee | 169 | |
7c218e6c | 170 | loaded_jit_reader = jit_reader_load (file.get ()); |
20aa2c60 | 171 | reinit_frame_cache (); |
32495661 | 172 | jit_inferior_created_hook (current_inferior ()); |
784c47ee SD |
173 | } |
174 | ||
175 | /* Provides the jit-reader-unload command. */ | |
176 | ||
177 | static void | |
0b39b52e | 178 | jit_reader_unload_command (const char *args, int from_tty) |
784c47ee SD |
179 | { |
180 | if (!loaded_jit_reader) | |
181 | error (_("No JIT reader loaded.")); | |
182 | ||
20aa2c60 PA |
183 | reinit_frame_cache (); |
184 | jit_inferior_exit_hook (current_inferior ()); | |
784c47ee | 185 | |
0e8621a0 | 186 | delete loaded_jit_reader; |
784c47ee SD |
187 | loaded_jit_reader = NULL; |
188 | } | |
189 | ||
0e74a041 | 190 | /* Destructor for jiter_objfile_data. */ |
03bef283 | 191 | |
0e74a041 | 192 | jiter_objfile_data::~jiter_objfile_data () |
03bef283 | 193 | { |
77208eb7 SM |
194 | if (this->jit_breakpoint != nullptr) |
195 | delete_breakpoint (this->jit_breakpoint); | |
238b5c9f | 196 | } |
03673fc7 | 197 | |
0e74a041 | 198 | /* Fetch the jiter_objfile_data associated with OBJF. If no data exists |
03bef283 TT |
199 | yet, make a new structure and attach it. */ |
200 | ||
0e74a041 SM |
201 | static jiter_objfile_data * |
202 | get_jiter_objfile_data (objfile *objf) | |
03bef283 | 203 | { |
0e74a041 | 204 | if (objf->jiter_data == nullptr) |
c1072906 | 205 | objf->jiter_data.reset (new jiter_objfile_data ()); |
03bef283 | 206 | |
0e74a041 | 207 | return objf->jiter_data.get (); |
03bef283 TT |
208 | } |
209 | ||
b4264740 SD |
210 | /* Remember OBJFILE has been created for struct jit_code_entry located |
211 | at inferior address ENTRY. */ | |
1825a88d SD |
212 | |
213 | static void | |
214 | add_objfile_entry (struct objfile *objfile, CORE_ADDR entry) | |
215 | { | |
0e74a041 | 216 | gdb_assert (objfile->jited_data == nullptr); |
1825a88d | 217 | |
0e74a041 | 218 | objfile->jited_data.reset (new jited_objfile_data (entry)); |
1825a88d SD |
219 | } |
220 | ||
1777feb0 | 221 | /* Helper function for reading the global JIT descriptor from remote |
bd920864 | 222 | memory. Returns true if all went well, false otherwise. */ |
4efc6507 | 223 | |
bd920864 | 224 | static bool |
fe053b9e TBA |
225 | jit_read_descriptor (gdbarch *gdbarch, |
226 | jit_descriptor *descriptor, | |
227 | objfile *jiter) | |
4efc6507 DE |
228 | { |
229 | int err; | |
230 | struct type *ptr_type; | |
231 | int ptr_size; | |
232 | int desc_size; | |
233 | gdb_byte *desc_buf; | |
0756c555 | 234 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
03bef283 | 235 | |
fe053b9e | 236 | gdb_assert (jiter != nullptr); |
8c1c720f SM |
237 | jiter_objfile_data *objf_data = jiter->jiter_data.get (); |
238 | gdb_assert (objf_data != nullptr); | |
03bef283 | 239 | |
2340e834 SM |
240 | CORE_ADDR addr = MSYMBOL_VALUE_ADDRESS (jiter, objf_data->descriptor); |
241 | ||
54ca9002 | 242 | jit_debug_printf ("descriptor_addr = %s", paddress (gdbarch, addr)); |
4efc6507 DE |
243 | |
244 | /* Figure out how big the descriptor is on the remote and how to read it. */ | |
0756c555 | 245 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
246 | ptr_size = TYPE_LENGTH (ptr_type); |
247 | desc_size = 8 + 2 * ptr_size; /* Two 32-bit ints and two pointers. */ | |
224c3ddb | 248 | desc_buf = (gdb_byte *) alloca (desc_size); |
4efc6507 DE |
249 | |
250 | /* Read the descriptor. */ | |
2340e834 | 251 | err = target_read_memory (addr, desc_buf, desc_size); |
4efc6507 | 252 | if (err) |
03bef283 | 253 | { |
0fed7461 TT |
254 | fprintf_unfiltered (gdb_stderr, _("Unable to read JIT descriptor from " |
255 | "remote memory\n")); | |
bd920864 | 256 | return false; |
03bef283 | 257 | } |
4efc6507 DE |
258 | |
259 | /* Fix the endianness to match the host. */ | |
260 | descriptor->version = extract_unsigned_integer (&desc_buf[0], 4, byte_order); | |
261 | descriptor->action_flag = | |
262 | extract_unsigned_integer (&desc_buf[4], 4, byte_order); | |
263 | descriptor->relevant_entry = extract_typed_address (&desc_buf[8], ptr_type); | |
264 | descriptor->first_entry = | |
265 | extract_typed_address (&desc_buf[8 + ptr_size], ptr_type); | |
03bef283 | 266 | |
bd920864 | 267 | return true; |
4efc6507 DE |
268 | } |
269 | ||
270 | /* Helper function for reading a JITed code entry from remote memory. */ | |
271 | ||
272 | static void | |
0756c555 DE |
273 | jit_read_code_entry (struct gdbarch *gdbarch, |
274 | CORE_ADDR code_addr, struct jit_code_entry *code_entry) | |
4efc6507 | 275 | { |
205c306f | 276 | int err, off; |
4efc6507 DE |
277 | struct type *ptr_type; |
278 | int ptr_size; | |
279 | int entry_size; | |
205c306f | 280 | int align_bytes; |
4efc6507 | 281 | gdb_byte *entry_buf; |
0756c555 | 282 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4efc6507 DE |
283 | |
284 | /* Figure out how big the entry is on the remote and how to read it. */ | |
0756c555 | 285 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 | 286 | ptr_size = TYPE_LENGTH (ptr_type); |
227ee7fc | 287 | |
e11fb955 TT |
288 | /* Figure out where the uint64_t value will be. */ |
289 | align_bytes = type_align (builtin_type (gdbarch)->builtin_uint64); | |
227ee7fc RH |
290 | off = 3 * ptr_size; |
291 | off = (off + (align_bytes - 1)) & ~(align_bytes - 1); | |
292 | ||
293 | entry_size = off + 8; /* Three pointers and one 64-bit int. */ | |
224c3ddb | 294 | entry_buf = (gdb_byte *) alloca (entry_size); |
4efc6507 DE |
295 | |
296 | /* Read the entry. */ | |
297 | err = target_read_memory (code_addr, entry_buf, entry_size); | |
298 | if (err) | |
299 | error (_("Unable to read JIT code entry from remote memory!")); | |
300 | ||
301 | /* Fix the endianness to match the host. */ | |
0756c555 | 302 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
303 | code_entry->next_entry = extract_typed_address (&entry_buf[0], ptr_type); |
304 | code_entry->prev_entry = | |
305 | extract_typed_address (&entry_buf[ptr_size], ptr_type); | |
306 | code_entry->symfile_addr = | |
307 | extract_typed_address (&entry_buf[2 * ptr_size], ptr_type); | |
308 | code_entry->symfile_size = | |
205c306f | 309 | extract_unsigned_integer (&entry_buf[off], 8, byte_order); |
4efc6507 DE |
310 | } |
311 | ||
1825a88d SD |
312 | /* Proxy object for building a block. */ |
313 | ||
314 | struct gdb_block | |
315 | { | |
b6112117 SM |
316 | gdb_block (gdb_block *parent, CORE_ADDR begin, CORE_ADDR end, |
317 | const char *name) | |
318 | : parent (parent), | |
319 | begin (begin), | |
320 | end (end), | |
321 | name (name != nullptr ? xstrdup (name) : nullptr) | |
322 | {} | |
323 | ||
0394eed1 SM |
324 | /* The parent of this block. */ |
325 | struct gdb_block *parent; | |
1825a88d SD |
326 | |
327 | /* Points to the "real" block that is being built out of this | |
328 | instance. This block will be added to a blockvector, which will | |
329 | then be added to a symtab. */ | |
b6112117 | 330 | struct block *real_block = nullptr; |
1825a88d SD |
331 | |
332 | /* The first and last code address corresponding to this block. */ | |
333 | CORE_ADDR begin, end; | |
334 | ||
335 | /* The name of this block (if any). If this is non-NULL, the | |
336 | FUNCTION symbol symbol is set to this value. */ | |
b6112117 | 337 | gdb::unique_xmalloc_ptr<char> name; |
1825a88d SD |
338 | }; |
339 | ||
340 | /* Proxy object for building a symtab. */ | |
341 | ||
342 | struct gdb_symtab | |
343 | { | |
89867184 SM |
344 | explicit gdb_symtab (const char *file_name) |
345 | : file_name (file_name != nullptr ? file_name : "") | |
346 | {} | |
347 | ||
1825a88d | 348 | /* The list of blocks in this symtab. These will eventually be |
0394eed1 SM |
349 | converted to real blocks. |
350 | ||
351 | This is specifically a linked list, instead of, for example, a vector, | |
352 | because the pointers are returned to the user's debug info reader. So | |
353 | it's important that the objects don't change location during their | |
354 | lifetime (which would happen with a vector of objects getting resized). */ | |
355 | std::forward_list<gdb_block> blocks; | |
1825a88d SD |
356 | |
357 | /* The number of blocks inserted. */ | |
89867184 | 358 | int nblocks = 0; |
1825a88d SD |
359 | |
360 | /* A mapping between line numbers to PC. */ | |
89867184 | 361 | gdb::unique_xmalloc_ptr<struct linetable> linetable; |
1825a88d SD |
362 | |
363 | /* The source file for this symtab. */ | |
89867184 | 364 | std::string file_name; |
1825a88d SD |
365 | }; |
366 | ||
367 | /* Proxy object for building an object. */ | |
368 | ||
369 | struct gdb_object | |
370 | { | |
1b61f46d SM |
371 | /* Symtabs of this object. |
372 | ||
373 | This is specifically a linked list, instead of, for example, a vector, | |
374 | because the pointers are returned to the user's debug info reader. So | |
375 | it's important that the objects don't change location during their | |
376 | lifetime (which would happen with a vector of objects getting resized). */ | |
377 | std::forward_list<gdb_symtab> symtabs; | |
1825a88d SD |
378 | }; |
379 | ||
380 | /* The type of the `private' data passed around by the callback | |
381 | functions. */ | |
382 | ||
4a620b7e SM |
383 | struct jit_dbg_reader_data |
384 | { | |
385 | /* Address of the jit_code_entry in the inferior's address space. */ | |
386 | CORE_ADDR entry_addr; | |
387 | ||
388 | /* The code entry, copied in our address space. */ | |
389 | const jit_code_entry &entry; | |
390 | ||
391 | struct gdbarch *gdbarch; | |
392 | }; | |
1825a88d SD |
393 | |
394 | /* The reader calls into this function to read data off the targets | |
395 | address space. */ | |
396 | ||
397 | static enum gdb_status | |
398 | jit_target_read_impl (GDB_CORE_ADDR target_mem, void *gdb_buf, int len) | |
399 | { | |
cb0a2700 SM |
400 | int result = target_read_memory ((CORE_ADDR) target_mem, |
401 | (gdb_byte *) gdb_buf, len); | |
1825a88d SD |
402 | if (result == 0) |
403 | return GDB_SUCCESS; | |
404 | else | |
405 | return GDB_FAIL; | |
406 | } | |
407 | ||
408 | /* The reader calls into this function to create a new gdb_object | |
409 | which it can then pass around to the other callbacks. Right now, | |
410 | all that is required is allocating the memory. */ | |
411 | ||
412 | static struct gdb_object * | |
413 | jit_object_open_impl (struct gdb_symbol_callbacks *cb) | |
414 | { | |
415 | /* CB is not required right now, but sometime in the future we might | |
416 | need a handle to it, and we'd like to do that without breaking | |
417 | the ABI. */ | |
1b61f46d | 418 | return new gdb_object; |
1825a88d SD |
419 | } |
420 | ||
421 | /* Readers call into this function to open a new gdb_symtab, which, | |
422 | again, is passed around to other callbacks. */ | |
423 | ||
424 | static struct gdb_symtab * | |
425 | jit_symtab_open_impl (struct gdb_symbol_callbacks *cb, | |
3a90f266 SM |
426 | struct gdb_object *object, |
427 | const char *file_name) | |
1825a88d | 428 | { |
1825a88d SD |
429 | /* CB stays unused. See comment in jit_object_open_impl. */ |
430 | ||
1b61f46d SM |
431 | object->symtabs.emplace_front (file_name); |
432 | return &object->symtabs.front (); | |
1825a88d SD |
433 | } |
434 | ||
1825a88d SD |
435 | /* Called by readers to open a new gdb_block. This function also |
436 | inserts the new gdb_block in the correct place in the corresponding | |
437 | gdb_symtab. */ | |
438 | ||
439 | static struct gdb_block * | |
440 | jit_block_open_impl (struct gdb_symbol_callbacks *cb, | |
3a90f266 SM |
441 | struct gdb_symtab *symtab, struct gdb_block *parent, |
442 | GDB_CORE_ADDR begin, GDB_CORE_ADDR end, const char *name) | |
1825a88d | 443 | { |
0394eed1 SM |
444 | /* Place the block at the beginning of the list, it will be sorted when the |
445 | symtab is finalized. */ | |
446 | symtab->blocks.emplace_front (parent, begin, end, name); | |
1825a88d SD |
447 | symtab->nblocks++; |
448 | ||
0394eed1 | 449 | return &symtab->blocks.front (); |
1825a88d SD |
450 | } |
451 | ||
452 | /* Readers call this to add a line mapping (from PC to line number) to | |
453 | a gdb_symtab. */ | |
4efc6507 DE |
454 | |
455 | static void | |
1825a88d | 456 | jit_symtab_line_mapping_add_impl (struct gdb_symbol_callbacks *cb, |
3a90f266 SM |
457 | struct gdb_symtab *stab, int nlines, |
458 | struct gdb_line_mapping *map) | |
1825a88d SD |
459 | { |
460 | int i; | |
224c3ddb | 461 | int alloc_len; |
1825a88d SD |
462 | |
463 | if (nlines < 1) | |
464 | return; | |
465 | ||
224c3ddb SM |
466 | alloc_len = sizeof (struct linetable) |
467 | + (nlines - 1) * sizeof (struct linetable_entry); | |
89867184 | 468 | stab->linetable.reset (XNEWVAR (struct linetable, alloc_len)); |
1825a88d SD |
469 | stab->linetable->nitems = nlines; |
470 | for (i = 0; i < nlines; i++) | |
471 | { | |
472 | stab->linetable->item[i].pc = (CORE_ADDR) map[i].pc; | |
473 | stab->linetable->item[i].line = map[i].line; | |
8c95582d | 474 | stab->linetable->item[i].is_stmt = 1; |
1825a88d SD |
475 | } |
476 | } | |
477 | ||
478 | /* Called by readers to close a gdb_symtab. Does not need to do | |
479 | anything as of now. */ | |
480 | ||
481 | static void | |
482 | jit_symtab_close_impl (struct gdb_symbol_callbacks *cb, | |
3a90f266 | 483 | struct gdb_symtab *stab) |
1825a88d SD |
484 | { |
485 | /* Right now nothing needs to be done here. We may need to do some | |
486 | cleanup here in the future (again, without breaking the plugin | |
487 | ABI). */ | |
488 | } | |
489 | ||
490 | /* Transform STAB to a proper symtab, and add it it OBJFILE. */ | |
491 | ||
492 | static void | |
493 | finalize_symtab (struct gdb_symtab *stab, struct objfile *objfile) | |
494 | { | |
43f3e411 | 495 | struct compunit_symtab *cust; |
241fd515 | 496 | size_t blockvector_size; |
1825a88d | 497 | CORE_ADDR begin, end; |
346d1dfe | 498 | struct blockvector *bv; |
1825a88d | 499 | |
0394eed1 SM |
500 | int actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks; |
501 | ||
502 | /* Sort the blocks in the order they should appear in the blockvector. */ | |
503 | stab->blocks.sort([] (const gdb_block &a, const gdb_block &b) | |
504 | { | |
505 | if (a.begin != b.begin) | |
506 | return a.begin < b.begin; | |
507 | ||
508 | return a.end > b.end; | |
509 | }); | |
1825a88d | 510 | |
89867184 SM |
511 | cust = allocate_compunit_symtab (objfile, stab->file_name.c_str ()); |
512 | allocate_symtab (cust, stab->file_name.c_str ()); | |
43f3e411 DE |
513 | add_compunit_symtab_to_objfile (cust); |
514 | ||
1825a88d | 515 | /* JIT compilers compile in memory. */ |
43f3e411 | 516 | COMPUNIT_DIRNAME (cust) = NULL; |
1825a88d SD |
517 | |
518 | /* Copy over the linetable entry if one was provided. */ | |
519 | if (stab->linetable) | |
520 | { | |
241fd515 AM |
521 | size_t size = ((stab->linetable->nitems - 1) |
522 | * sizeof (struct linetable_entry) | |
523 | + sizeof (struct linetable)); | |
43f3e411 | 524 | SYMTAB_LINETABLE (COMPUNIT_FILETABS (cust)) |
224c3ddb | 525 | = (struct linetable *) obstack_alloc (&objfile->objfile_obstack, size); |
89867184 SM |
526 | memcpy (SYMTAB_LINETABLE (COMPUNIT_FILETABS (cust)), |
527 | stab->linetable.get (), size); | |
1825a88d SD |
528 | } |
529 | ||
530 | blockvector_size = (sizeof (struct blockvector) | |
3a90f266 | 531 | + (actual_nblocks - 1) * sizeof (struct block *)); |
224c3ddb SM |
532 | bv = (struct blockvector *) obstack_alloc (&objfile->objfile_obstack, |
533 | blockvector_size); | |
43f3e411 | 534 | COMPUNIT_BLOCKVECTOR (cust) = bv; |
1825a88d | 535 | |
0394eed1 SM |
536 | /* At the end of this function, (begin, end) will contain the PC range this |
537 | entire blockvector spans. */ | |
346d1dfe | 538 | BLOCKVECTOR_MAP (bv) = NULL; |
0394eed1 SM |
539 | begin = stab->blocks.front ().begin; |
540 | end = stab->blocks.front ().end; | |
346d1dfe | 541 | BLOCKVECTOR_NBLOCKS (bv) = actual_nblocks; |
1825a88d SD |
542 | |
543 | /* First run over all the gdb_block objects, creating a real block | |
544 | object for each. Simultaneously, keep setting the real_block | |
545 | fields. */ | |
0394eed1 SM |
546 | int block_idx = FIRST_LOCAL_BLOCK; |
547 | for (gdb_block &gdb_block_iter : stab->blocks) | |
1825a88d SD |
548 | { |
549 | struct block *new_block = allocate_block (&objfile->objfile_obstack); | |
8c14c3a3 | 550 | struct symbol *block_name = new (&objfile->objfile_obstack) symbol; |
08feed99 | 551 | struct type *block_type = arch_type (objfile->arch (), |
2535757a | 552 | TYPE_CODE_VOID, |
77b7c781 | 553 | TARGET_CHAR_BIT, |
2535757a | 554 | "void"); |
1825a88d | 555 | |
b026f593 KS |
556 | BLOCK_MULTIDICT (new_block) |
557 | = mdict_create_linear (&objfile->objfile_obstack, NULL); | |
1825a88d | 558 | /* The address range. */ |
0394eed1 SM |
559 | BLOCK_START (new_block) = (CORE_ADDR) gdb_block_iter.begin; |
560 | BLOCK_END (new_block) = (CORE_ADDR) gdb_block_iter.end; | |
1825a88d SD |
561 | |
562 | /* The name. */ | |
1825a88d | 563 | SYMBOL_DOMAIN (block_name) = VAR_DOMAIN; |
f1e6e072 | 564 | SYMBOL_ACLASS_INDEX (block_name) = LOC_BLOCK; |
08be3fe3 | 565 | symbol_set_symtab (block_name, COMPUNIT_FILETABS (cust)); |
2535757a | 566 | SYMBOL_TYPE (block_name) = lookup_function_type (block_type); |
1825a88d SD |
567 | SYMBOL_BLOCK_VALUE (block_name) = new_block; |
568 | ||
4d4eaa30 CB |
569 | block_name->m_name = obstack_strdup (&objfile->objfile_obstack, |
570 | gdb_block_iter.name.get ()); | |
1825a88d SD |
571 | |
572 | BLOCK_FUNCTION (new_block) = block_name; | |
573 | ||
0394eed1 | 574 | BLOCKVECTOR_BLOCK (bv, block_idx) = new_block; |
1825a88d | 575 | if (begin > BLOCK_START (new_block)) |
3a90f266 | 576 | begin = BLOCK_START (new_block); |
1825a88d | 577 | if (end < BLOCK_END (new_block)) |
3a90f266 | 578 | end = BLOCK_END (new_block); |
1825a88d | 579 | |
0394eed1 SM |
580 | gdb_block_iter.real_block = new_block; |
581 | ||
582 | block_idx++; | |
1825a88d SD |
583 | } |
584 | ||
585 | /* Now add the special blocks. */ | |
0394eed1 SM |
586 | struct block *block_iter = NULL; |
587 | for (enum block_enum i : { GLOBAL_BLOCK, STATIC_BLOCK }) | |
1825a88d | 588 | { |
84a146c9 TT |
589 | struct block *new_block; |
590 | ||
591 | new_block = (i == GLOBAL_BLOCK | |
592 | ? allocate_global_block (&objfile->objfile_obstack) | |
593 | : allocate_block (&objfile->objfile_obstack)); | |
b026f593 KS |
594 | BLOCK_MULTIDICT (new_block) |
595 | = mdict_create_linear (&objfile->objfile_obstack, NULL); | |
1825a88d SD |
596 | BLOCK_SUPERBLOCK (new_block) = block_iter; |
597 | block_iter = new_block; | |
598 | ||
599 | BLOCK_START (new_block) = (CORE_ADDR) begin; | |
600 | BLOCK_END (new_block) = (CORE_ADDR) end; | |
601 | ||
346d1dfe | 602 | BLOCKVECTOR_BLOCK (bv, i) = new_block; |
84a146c9 TT |
603 | |
604 | if (i == GLOBAL_BLOCK) | |
43f3e411 | 605 | set_block_compunit_symtab (new_block, cust); |
1825a88d SD |
606 | } |
607 | ||
608 | /* Fill up the superblock fields for the real blocks, using the | |
609 | real_block fields populated earlier. */ | |
0394eed1 | 610 | for (gdb_block &gdb_block_iter : stab->blocks) |
1825a88d | 611 | { |
0394eed1 | 612 | if (gdb_block_iter.parent != NULL) |
db334a01 SD |
613 | { |
614 | /* If the plugin specifically mentioned a parent block, we | |
615 | use that. */ | |
0394eed1 SM |
616 | BLOCK_SUPERBLOCK (gdb_block_iter.real_block) = |
617 | gdb_block_iter.parent->real_block; | |
db334a01 SD |
618 | } |
619 | else | |
620 | { | |
621 | /* And if not, we set a default parent block. */ | |
0394eed1 | 622 | BLOCK_SUPERBLOCK (gdb_block_iter.real_block) = |
346d1dfe | 623 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK); |
db334a01 | 624 | } |
1825a88d | 625 | } |
1825a88d SD |
626 | } |
627 | ||
628 | /* Called when closing a gdb_objfile. Converts OBJ to a proper | |
629 | objfile. */ | |
630 | ||
631 | static void | |
632 | jit_object_close_impl (struct gdb_symbol_callbacks *cb, | |
3a90f266 | 633 | struct gdb_object *obj) |
1825a88d | 634 | { |
4a620b7e SM |
635 | jit_dbg_reader_data *priv_data = (jit_dbg_reader_data *) cb->priv_data; |
636 | std::string objfile_name | |
637 | = string_printf ("<< JIT compiled code at %s >>", | |
638 | paddress (priv_data->gdbarch, | |
639 | priv_data->entry.symfile_addr)); | |
1825a88d | 640 | |
4a620b7e SM |
641 | objfile *objfile = objfile::make (nullptr, objfile_name.c_str (), |
642 | OBJF_NOT_FILENAME); | |
643 | objfile->per_bfd->gdbarch = priv_data->gdbarch; | |
1825a88d | 644 | |
1b61f46d SM |
645 | for (gdb_symtab &symtab : obj->symtabs) |
646 | finalize_symtab (&symtab, objfile); | |
647 | ||
4a620b7e | 648 | add_objfile_entry (objfile, priv_data->entry_addr); |
1b61f46d SM |
649 | |
650 | delete obj; | |
1825a88d SD |
651 | } |
652 | ||
744ab88c | 653 | /* Try to read CODE_ENTRY using the loaded jit reader (if any). |
b4264740 SD |
654 | ENTRY_ADDR is the address of the struct jit_code_entry in the |
655 | inferior address space. */ | |
1825a88d SD |
656 | |
657 | static int | |
4a620b7e | 658 | jit_reader_try_read_symtab (gdbarch *gdbarch, jit_code_entry *code_entry, |
3a90f266 | 659 | CORE_ADDR entry_addr) |
1825a88d | 660 | { |
1825a88d | 661 | int status; |
4a620b7e SM |
662 | jit_dbg_reader_data priv_data |
663 | { | |
664 | entry_addr, | |
665 | *code_entry, | |
666 | gdbarch | |
667 | }; | |
1825a88d | 668 | struct gdb_reader_funcs *funcs; |
1825a88d SD |
669 | struct gdb_symbol_callbacks callbacks = |
670 | { | |
671 | jit_object_open_impl, | |
672 | jit_symtab_open_impl, | |
673 | jit_block_open_impl, | |
674 | jit_symtab_close_impl, | |
675 | jit_object_close_impl, | |
676 | ||
677 | jit_symtab_line_mapping_add_impl, | |
678 | jit_target_read_impl, | |
679 | ||
680 | &priv_data | |
681 | }; | |
682 | ||
1825a88d SD |
683 | if (!loaded_jit_reader) |
684 | return 0; | |
685 | ||
7190276c | 686 | gdb::byte_vector gdb_mem (code_entry->symfile_size); |
1825a88d SD |
687 | |
688 | status = 1; | |
a70b8144 | 689 | try |
492d29ea | 690 | { |
7190276c | 691 | if (target_read_memory (code_entry->symfile_addr, gdb_mem.data (), |
492d29ea PA |
692 | code_entry->symfile_size)) |
693 | status = 0; | |
694 | } | |
230d2906 | 695 | catch (const gdb_exception &e) |
492d29ea | 696 | { |
1825a88d | 697 | status = 0; |
492d29ea | 698 | } |
1825a88d SD |
699 | |
700 | if (status) | |
701 | { | |
702 | funcs = loaded_jit_reader->functions; | |
7190276c SM |
703 | if (funcs->read (funcs, &callbacks, gdb_mem.data (), |
704 | code_entry->symfile_size) | |
3a90f266 SM |
705 | != GDB_SUCCESS) |
706 | status = 0; | |
1825a88d SD |
707 | } |
708 | ||
54ca9002 SM |
709 | if (status == 0) |
710 | jit_debug_printf ("Could not read symtab using the loaded JIT reader."); | |
711 | ||
1825a88d SD |
712 | return status; |
713 | } | |
714 | ||
744ab88c | 715 | /* Try to read CODE_ENTRY using BFD. ENTRY_ADDR is the address of the |
b4264740 | 716 | struct jit_code_entry in the inferior address space. */ |
1825a88d SD |
717 | |
718 | static void | |
719 | jit_bfd_try_read_symtab (struct jit_code_entry *code_entry, | |
3a90f266 SM |
720 | CORE_ADDR entry_addr, |
721 | struct gdbarch *gdbarch) | |
4efc6507 | 722 | { |
4efc6507 DE |
723 | struct bfd_section *sec; |
724 | struct objfile *objfile; | |
4efc6507 | 725 | const struct bfd_arch_info *b; |
4efc6507 | 726 | |
54ca9002 SM |
727 | jit_debug_printf ("symfile_addr = %s, symfile_size = %s", |
728 | paddress (gdbarch, code_entry->symfile_addr), | |
729 | pulongest (code_entry->symfile_size)); | |
a255712f | 730 | |
15cc148f MS |
731 | gdb_bfd_ref_ptr nbfd (gdb_bfd_open_from_target_memory |
732 | (code_entry->symfile_addr, code_entry->symfile_size, gnutarget)); | |
4dfb2365 JK |
733 | if (nbfd == NULL) |
734 | { | |
0fed7461 TT |
735 | fputs_unfiltered (_("Error opening JITed symbol file, ignoring it.\n"), |
736 | gdb_stderr); | |
4dfb2365 JK |
737 | return; |
738 | } | |
4efc6507 DE |
739 | |
740 | /* Check the format. NOTE: This initializes important data that GDB uses! | |
741 | We would segfault later without this line. */ | |
192b62ce | 742 | if (!bfd_check_format (nbfd.get (), bfd_object)) |
4efc6507 | 743 | { |
0fed7461 | 744 | fprintf_unfiltered (gdb_stderr, _("\ |
4efc6507 | 745 | JITed symbol file is not an object file, ignoring it.\n")); |
4efc6507 DE |
746 | return; |
747 | } | |
748 | ||
749 | /* Check bfd arch. */ | |
0756c555 | 750 | b = gdbarch_bfd_arch_info (gdbarch); |
192b62ce | 751 | if (b->compatible (b, bfd_get_arch_info (nbfd.get ())) != b) |
4efc6507 | 752 | warning (_("JITed object file architecture %s is not compatible " |
3a90f266 | 753 | "with target architecture %s."), |
192b62ce TT |
754 | bfd_get_arch_info (nbfd.get ())->printable_name, |
755 | b->printable_name); | |
4efc6507 DE |
756 | |
757 | /* Read the section address information out of the symbol file. Since the | |
758 | file is generated by the JIT at runtime, it should all of the absolute | |
759 | addresses that we care about. */ | |
37e136b1 | 760 | section_addr_info sai; |
4efc6507 | 761 | for (sec = nbfd->sections; sec != NULL; sec = sec->next) |
fd361982 | 762 | if ((bfd_section_flags (sec) & (SEC_ALLOC|SEC_LOAD)) != 0) |
4efc6507 | 763 | { |
3a90f266 SM |
764 | /* We assume that these virtual addresses are absolute, and do not |
765 | treat them as offsets. */ | |
fd361982 AM |
766 | sai.emplace_back (bfd_section_vma (sec), |
767 | bfd_section_name (sec), | |
37e136b1 | 768 | sec->index); |
4efc6507 DE |
769 | } |
770 | ||
8ac244b4 | 771 | /* This call does not take ownership of SAI. */ |
192b62ce | 772 | objfile = symbol_file_add_from_bfd (nbfd.get (), |
37e136b1 TT |
773 | bfd_get_filename (nbfd.get ()), 0, |
774 | &sai, | |
40135bb1 | 775 | OBJF_SHARED | OBJF_NOT_FILENAME, NULL); |
4efc6507 | 776 | |
744ab88c | 777 | add_objfile_entry (objfile, entry_addr); |
1825a88d SD |
778 | } |
779 | ||
780 | /* This function registers code associated with a JIT code entry. It uses the | |
781 | pointer and size pair in the entry to read the symbol file from the remote | |
782 | and then calls symbol_file_add_from_local_memory to add it as though it were | |
783 | a symbol file added by the user. */ | |
784 | ||
785 | static void | |
786 | jit_register_code (struct gdbarch *gdbarch, | |
3a90f266 | 787 | CORE_ADDR entry_addr, struct jit_code_entry *code_entry) |
1825a88d | 788 | { |
974a734b | 789 | int success; |
1825a88d | 790 | |
54ca9002 SM |
791 | jit_debug_printf ("symfile_addr = %s, symfile_size = %s", |
792 | paddress (gdbarch, code_entry->symfile_addr), | |
793 | pulongest (code_entry->symfile_size)); | |
1825a88d | 794 | |
4a620b7e | 795 | success = jit_reader_try_read_symtab (gdbarch, code_entry, entry_addr); |
1825a88d SD |
796 | |
797 | if (!success) | |
744ab88c | 798 | jit_bfd_try_read_symtab (code_entry, entry_addr, gdbarch); |
4efc6507 DE |
799 | } |
800 | ||
4efc6507 DE |
801 | /* Look up the objfile with this code entry address. */ |
802 | ||
803 | static struct objfile * | |
804 | jit_find_objf_with_entry_addr (CORE_ADDR entry_addr) | |
805 | { | |
2030c079 | 806 | for (objfile *objf : current_program_space->objfiles ()) |
4efc6507 | 807 | { |
0e74a041 | 808 | if (objf->jited_data != nullptr && objf->jited_data->addr == entry_addr) |
3a90f266 | 809 | return objf; |
4efc6507 | 810 | } |
238b5c9f | 811 | |
4efc6507 DE |
812 | return NULL; |
813 | } | |
814 | ||
f25c0135 TT |
815 | /* This is called when a breakpoint is deleted. It updates the |
816 | inferior's cache, if needed. */ | |
817 | ||
818 | static void | |
819 | jit_breakpoint_deleted (struct breakpoint *b) | |
820 | { | |
f25c0135 TT |
821 | if (b->type != bp_jit_event) |
822 | return; | |
823 | ||
40cb8ca5 | 824 | for (bp_location *iter : b->locations ()) |
8eacb197 | 825 | { |
c8474dc3 | 826 | for (objfile *objf : iter->pspace->objfiles ()) |
8eacb197 | 827 | { |
77208eb7 SM |
828 | jiter_objfile_data *jiter_data = objf->jiter_data.get (); |
829 | ||
c8474dc3 TBA |
830 | if (jiter_data != nullptr |
831 | && jiter_data->jit_breakpoint == iter->owner) | |
77208eb7 SM |
832 | { |
833 | jiter_data->cached_code_address = 0; | |
834 | jiter_data->jit_breakpoint = nullptr; | |
835 | } | |
8eacb197 TT |
836 | } |
837 | } | |
f25c0135 TT |
838 | } |
839 | ||
c8474dc3 TBA |
840 | /* (Re-)Initialize the jit breakpoints for JIT-producing objfiles in |
841 | PSPACE. */ | |
03673fc7 | 842 | |
c8474dc3 TBA |
843 | static void |
844 | jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, program_space *pspace) | |
03673fc7 | 845 | { |
c8474dc3 | 846 | for (objfile *the_objfile : pspace->objfiles ()) |
f25c0135 | 847 | { |
6d1a09b7 TV |
848 | /* Skip separate debug objects. */ |
849 | if (the_objfile->separate_debug_objfile_backlink != nullptr) | |
850 | continue; | |
851 | ||
a7b4ff4f SM |
852 | if (the_objfile->skip_jit_symbol_lookup) |
853 | continue; | |
854 | ||
f25c0135 TT |
855 | /* Lookup the registration symbol. If it is missing, then we |
856 | assume we are not attached to a JIT. */ | |
c8474dc3 TBA |
857 | bound_minimal_symbol reg_symbol |
858 | = lookup_minimal_symbol (jit_break_name, nullptr, the_objfile); | |
7cbd4a93 | 859 | if (reg_symbol.minsym == NULL |
77e371c0 | 860 | || BMSYMBOL_VALUE_ADDRESS (reg_symbol) == 0) |
a7b4ff4f SM |
861 | { |
862 | /* No need to repeat the lookup the next time. */ | |
863 | the_objfile->skip_jit_symbol_lookup = true; | |
864 | continue; | |
865 | } | |
03bef283 | 866 | |
c8474dc3 TBA |
867 | bound_minimal_symbol desc_symbol |
868 | = lookup_minimal_symbol (jit_descriptor_name, NULL, the_objfile); | |
3b7344d5 | 869 | if (desc_symbol.minsym == NULL |
77e371c0 | 870 | || BMSYMBOL_VALUE_ADDRESS (desc_symbol) == 0) |
a7b4ff4f SM |
871 | { |
872 | /* No need to repeat the lookup the next time. */ | |
873 | the_objfile->skip_jit_symbol_lookup = true; | |
874 | continue; | |
875 | } | |
03bef283 | 876 | |
2340e834 | 877 | jiter_objfile_data *objf_data |
6d1a09b7 | 878 | = get_jiter_objfile_data (the_objfile); |
7cbd4a93 | 879 | objf_data->register_code = reg_symbol.minsym; |
3b7344d5 | 880 | objf_data->descriptor = desc_symbol.minsym; |
03bef283 | 881 | |
c8474dc3 TBA |
882 | CORE_ADDR addr = MSYMBOL_VALUE_ADDRESS (the_objfile, |
883 | objf_data->register_code); | |
03bef283 | 884 | |
54ca9002 | 885 | jit_debug_printf ("breakpoint_addr = %s", paddress (gdbarch, addr)); |
f25c0135 | 886 | |
c8474dc3 TBA |
887 | /* Check if we need to re-create the breakpoint. */ |
888 | if (objf_data->cached_code_address == addr) | |
889 | continue; | |
03673fc7 | 890 | |
c8474dc3 TBA |
891 | /* Delete the old breakpoint. */ |
892 | if (objf_data->jit_breakpoint != nullptr) | |
893 | delete_breakpoint (objf_data->jit_breakpoint); | |
03673fc7 | 894 | |
c8474dc3 TBA |
895 | /* Put a breakpoint in the registration symbol. */ |
896 | objf_data->cached_code_address = addr; | |
897 | objf_data->jit_breakpoint = create_jit_event_breakpoint (gdbarch, addr); | |
898 | } | |
03673fc7 PP |
899 | } |
900 | ||
3623dc3a SD |
901 | /* The private data passed around in the frame unwind callback |
902 | functions. */ | |
903 | ||
904 | struct jit_unwind_private | |
905 | { | |
906 | /* Cached register values. See jit_frame_sniffer to see how this | |
907 | works. */ | |
c8ec2f33 | 908 | detached_regcache *regcache; |
3623dc3a SD |
909 | |
910 | /* The frame being unwound. */ | |
911 | struct frame_info *this_frame; | |
912 | }; | |
913 | ||
914 | /* Sets the value of a particular register in this frame. */ | |
915 | ||
916 | static void | |
917 | jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum, | |
3a90f266 | 918 | struct gdb_reg_value *value) |
3623dc3a SD |
919 | { |
920 | struct jit_unwind_private *priv; | |
921 | int gdb_reg; | |
922 | ||
9a3c8263 | 923 | priv = (struct jit_unwind_private *) cb->priv_data; |
3623dc3a SD |
924 | |
925 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame), | |
3a90f266 | 926 | dwarf_regnum); |
3623dc3a SD |
927 | if (gdb_reg == -1) |
928 | { | |
54ca9002 | 929 | jit_debug_printf ("Could not recognize DWARF regnum %d", dwarf_regnum); |
20aa2c60 | 930 | value->free (value); |
3623dc3a SD |
931 | return; |
932 | } | |
933 | ||
c8ec2f33 | 934 | priv->regcache->raw_supply (gdb_reg, value->value); |
20aa2c60 | 935 | value->free (value); |
3623dc3a SD |
936 | } |
937 | ||
938 | static void | |
939 | reg_value_free_impl (struct gdb_reg_value *value) | |
940 | { | |
941 | xfree (value); | |
942 | } | |
943 | ||
944 | /* Get the value of register REGNUM in the previous frame. */ | |
945 | ||
946 | static struct gdb_reg_value * | |
947 | jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum) | |
948 | { | |
949 | struct jit_unwind_private *priv; | |
950 | struct gdb_reg_value *value; | |
951 | int gdb_reg, size; | |
952 | struct gdbarch *frame_arch; | |
953 | ||
9a3c8263 | 954 | priv = (struct jit_unwind_private *) cb->priv_data; |
3623dc3a SD |
955 | frame_arch = get_frame_arch (priv->this_frame); |
956 | ||
957 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum); | |
958 | size = register_size (frame_arch, gdb_reg); | |
224c3ddb SM |
959 | value = ((struct gdb_reg_value *) |
960 | xmalloc (sizeof (struct gdb_reg_value) + size - 1)); | |
ca9d61b9 JB |
961 | value->defined = deprecated_frame_register_read (priv->this_frame, gdb_reg, |
962 | value->value); | |
3623dc3a SD |
963 | value->size = size; |
964 | value->free = reg_value_free_impl; | |
965 | return value; | |
966 | } | |
967 | ||
968 | /* gdb_reg_value has a free function, which must be called on each | |
969 | saved register value. */ | |
970 | ||
971 | static void | |
972 | jit_dealloc_cache (struct frame_info *this_frame, void *cache) | |
973 | { | |
9a3c8263 | 974 | struct jit_unwind_private *priv_data = (struct jit_unwind_private *) cache; |
3623dc3a | 975 | |
20aa2c60 | 976 | gdb_assert (priv_data->regcache != NULL); |
c0e383c6 | 977 | delete priv_data->regcache; |
3623dc3a SD |
978 | xfree (priv_data); |
979 | } | |
980 | ||
981 | /* The frame sniffer for the pseudo unwinder. | |
982 | ||
983 | While this is nominally a frame sniffer, in the case where the JIT | |
984 | reader actually recognizes the frame, it does a lot more work -- it | |
985 | unwinds the frame and saves the corresponding register values in | |
986 | the cache. jit_frame_prev_register simply returns the saved | |
987 | register values. */ | |
988 | ||
989 | static int | |
990 | jit_frame_sniffer (const struct frame_unwind *self, | |
3a90f266 | 991 | struct frame_info *this_frame, void **cache) |
3623dc3a | 992 | { |
3623dc3a | 993 | struct jit_unwind_private *priv_data; |
3623dc3a SD |
994 | struct gdb_unwind_callbacks callbacks; |
995 | struct gdb_reader_funcs *funcs; | |
996 | ||
3623dc3a SD |
997 | callbacks.reg_get = jit_unwind_reg_get_impl; |
998 | callbacks.reg_set = jit_unwind_reg_set_impl; | |
999 | callbacks.target_read = jit_target_read_impl; | |
1000 | ||
1001 | if (loaded_jit_reader == NULL) | |
1002 | return 0; | |
1003 | ||
1004 | funcs = loaded_jit_reader->functions; | |
1005 | ||
1006 | gdb_assert (!*cache); | |
1007 | ||
41bf6aca | 1008 | *cache = XCNEW (struct jit_unwind_private); |
9a3c8263 | 1009 | priv_data = (struct jit_unwind_private *) *cache; |
c8ec2f33 YQ |
1010 | /* Take a snapshot of current regcache. */ |
1011 | priv_data->regcache = new detached_regcache (get_frame_arch (this_frame), | |
1012 | true); | |
3623dc3a SD |
1013 | priv_data->this_frame = this_frame; |
1014 | ||
1015 | callbacks.priv_data = priv_data; | |
1016 | ||
1017 | /* Try to coax the provided unwinder to unwind the stack */ | |
1018 | if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS) | |
1019 | { | |
54ca9002 | 1020 | jit_debug_printf ("Successfully unwound frame using JIT reader."); |
3623dc3a SD |
1021 | return 1; |
1022 | } | |
54ca9002 SM |
1023 | |
1024 | jit_debug_printf ("Could not unwind frame using JIT reader."); | |
3623dc3a SD |
1025 | |
1026 | jit_dealloc_cache (this_frame, *cache); | |
1027 | *cache = NULL; | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | /* The frame_id function for the pseudo unwinder. Relays the call to | |
1034 | the loaded plugin. */ | |
1035 | ||
1036 | static void | |
1037 | jit_frame_this_id (struct frame_info *this_frame, void **cache, | |
3a90f266 | 1038 | struct frame_id *this_id) |
3623dc3a | 1039 | { |
fe978cb0 | 1040 | struct jit_unwind_private priv; |
3623dc3a SD |
1041 | struct gdb_frame_id frame_id; |
1042 | struct gdb_reader_funcs *funcs; | |
1043 | struct gdb_unwind_callbacks callbacks; | |
1044 | ||
20aa2c60 | 1045 | priv.regcache = NULL; |
fe978cb0 | 1046 | priv.this_frame = this_frame; |
3623dc3a SD |
1047 | |
1048 | /* We don't expect the frame_id function to set any registers, so we | |
1049 | set reg_set to NULL. */ | |
1050 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1051 | callbacks.reg_set = NULL; | |
1052 | callbacks.target_read = jit_target_read_impl; | |
fe978cb0 | 1053 | callbacks.priv_data = &priv; |
3623dc3a SD |
1054 | |
1055 | gdb_assert (loaded_jit_reader); | |
1056 | funcs = loaded_jit_reader->functions; | |
1057 | ||
1058 | frame_id = funcs->get_frame_id (funcs, &callbacks); | |
1059 | *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address); | |
1060 | } | |
1061 | ||
1062 | /* Pseudo unwinder function. Reads the previously fetched value for | |
1063 | the register from the cache. */ | |
1064 | ||
1065 | static struct value * | |
1066 | jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg) | |
1067 | { | |
9a3c8263 | 1068 | struct jit_unwind_private *priv = (struct jit_unwind_private *) *cache; |
20aa2c60 | 1069 | struct gdbarch *gdbarch; |
3623dc3a SD |
1070 | |
1071 | if (priv == NULL) | |
1072 | return frame_unwind_got_optimized (this_frame, reg); | |
1073 | ||
ac7936df | 1074 | gdbarch = priv->regcache->arch (); |
3f5a868b YQ |
1075 | gdb_byte *buf = (gdb_byte *) alloca (register_size (gdbarch, reg)); |
1076 | enum register_status status = priv->regcache->cooked_read (reg, buf); | |
20aa2c60 | 1077 | |
3f5a868b YQ |
1078 | if (status == REG_VALID) |
1079 | return frame_unwind_got_bytes (this_frame, reg, buf); | |
3623dc3a | 1080 | else |
3f5a868b | 1081 | return frame_unwind_got_optimized (this_frame, reg); |
3623dc3a SD |
1082 | } |
1083 | ||
1084 | /* Relay everything back to the unwinder registered by the JIT debug | |
1085 | info reader.*/ | |
1086 | ||
1087 | static const struct frame_unwind jit_frame_unwind = | |
1088 | { | |
a154d838 | 1089 | "jit", |
3623dc3a SD |
1090 | NORMAL_FRAME, |
1091 | default_frame_unwind_stop_reason, | |
1092 | jit_frame_this_id, | |
1093 | jit_frame_prev_register, | |
1094 | NULL, | |
1095 | jit_frame_sniffer, | |
1096 | jit_dealloc_cache | |
1097 | }; | |
1098 | ||
1099 | ||
1100 | /* This is the information that is stored at jit_gdbarch_data for each | |
1101 | architecture. */ | |
1102 | ||
1103 | struct jit_gdbarch_data_type | |
1104 | { | |
1105 | /* Has the (pseudo) unwinder been prepended? */ | |
1106 | int unwinder_registered; | |
1107 | }; | |
1108 | ||
1109 | /* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */ | |
1110 | ||
1111 | static void | |
1112 | jit_prepend_unwinder (struct gdbarch *gdbarch) | |
1113 | { | |
1114 | struct jit_gdbarch_data_type *data; | |
1115 | ||
9a3c8263 SM |
1116 | data |
1117 | = (struct jit_gdbarch_data_type *) gdbarch_data (gdbarch, jit_gdbarch_data); | |
3623dc3a SD |
1118 | if (!data->unwinder_registered) |
1119 | { | |
1120 | frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind); | |
1121 | data->unwinder_registered = 1; | |
1122 | } | |
1123 | } | |
1124 | ||
03673fc7 | 1125 | /* Register any already created translations. */ |
0756c555 DE |
1126 | |
1127 | static void | |
32495661 | 1128 | jit_inferior_init (inferior *inf) |
4efc6507 | 1129 | { |
4efc6507 DE |
1130 | struct jit_descriptor descriptor; |
1131 | struct jit_code_entry cur_entry; | |
1132 | CORE_ADDR cur_entry_addr; | |
32495661 SM |
1133 | struct gdbarch *gdbarch = inf->gdbarch; |
1134 | program_space *pspace = inf->pspace; | |
4efc6507 | 1135 | |
54ca9002 | 1136 | jit_debug_printf ("called"); |
a255712f | 1137 | |
3623dc3a SD |
1138 | jit_prepend_unwinder (gdbarch); |
1139 | ||
32495661 | 1140 | jit_breakpoint_re_set_internal (gdbarch, pspace); |
4efc6507 | 1141 | |
32495661 | 1142 | for (objfile *jiter : pspace->objfiles ()) |
c8474dc3 TBA |
1143 | { |
1144 | if (jiter->jiter_data == nullptr) | |
1145 | continue; | |
fe053b9e | 1146 | |
c8474dc3 TBA |
1147 | /* Read the descriptor so we can check the version number and load |
1148 | any already JITed functions. */ | |
1149 | if (!jit_read_descriptor (gdbarch, &descriptor, jiter)) | |
1150 | continue; | |
4efc6507 | 1151 | |
c8474dc3 TBA |
1152 | /* Check that the version number agrees with that we support. */ |
1153 | if (descriptor.version != 1) | |
1154 | { | |
0fed7461 TT |
1155 | fprintf_unfiltered (gdb_stderr, |
1156 | _("Unsupported JIT protocol version %ld " | |
1157 | "in descriptor (expected 1)\n"), | |
1158 | (long) descriptor.version); | |
c8474dc3 TBA |
1159 | continue; |
1160 | } | |
4efc6507 | 1161 | |
c8474dc3 TBA |
1162 | /* If we've attached to a running program, we need to check the |
1163 | descriptor to register any functions that were already | |
1164 | generated. */ | |
1165 | for (cur_entry_addr = descriptor.first_entry; | |
1166 | cur_entry_addr != 0; | |
1167 | cur_entry_addr = cur_entry.next_entry) | |
1168 | { | |
1169 | jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry); | |
4efc6507 | 1170 | |
c8474dc3 TBA |
1171 | /* This hook may be called many times during setup, so make sure |
1172 | we don't add the same symbol file twice. */ | |
1173 | if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL) | |
1174 | continue; | |
4efc6507 | 1175 | |
c8474dc3 TBA |
1176 | jit_register_code (gdbarch, cur_entry_addr, &cur_entry); |
1177 | } | |
4efc6507 DE |
1178 | } |
1179 | } | |
1180 | ||
42a4fec5 SM |
1181 | /* Looks for the descriptor and registration symbols and breakpoints |
1182 | the registration function. If it finds both, it registers all the | |
1183 | already JITed code. If it has already found the symbols, then it | |
1184 | doesn't try again. */ | |
0756c555 | 1185 | |
42a4fec5 | 1186 | static void |
32495661 | 1187 | jit_inferior_created_hook (inferior *inf) |
0756c555 | 1188 | { |
32495661 | 1189 | jit_inferior_init (inf); |
0756c555 DE |
1190 | } |
1191 | ||
1192 | /* Exported routine to call to re-set the jit breakpoints, | |
1193 | e.g. when a program is rerun. */ | |
1194 | ||
1195 | void | |
1196 | jit_breakpoint_re_set (void) | |
1197 | { | |
c8474dc3 | 1198 | jit_breakpoint_re_set_internal (target_gdbarch (), current_program_space); |
03673fc7 PP |
1199 | } |
1200 | ||
1777feb0 MS |
1201 | /* This function cleans up any code entries left over when the |
1202 | inferior exits. We get left over code when the inferior exits | |
1203 | without unregistering its code, for example when it crashes. */ | |
4efc6507 DE |
1204 | |
1205 | static void | |
a79b8f6e | 1206 | jit_inferior_exit_hook (struct inferior *inf) |
4efc6507 | 1207 | { |
7e955d83 | 1208 | for (objfile *objf : current_program_space->objfiles_safe ()) |
03bef283 | 1209 | { |
0e74a041 | 1210 | if (objf->jited_data != nullptr && objf->jited_data->addr != 0) |
268e4f09 | 1211 | objf->unlink (); |
03bef283 | 1212 | } |
03673fc7 PP |
1213 | } |
1214 | ||
4efc6507 | 1215 | void |
fe053b9e | 1216 | jit_event_handler (gdbarch *gdbarch, objfile *jiter) |
4efc6507 DE |
1217 | { |
1218 | struct jit_descriptor descriptor; | |
4efc6507 | 1219 | |
8c1c720f SM |
1220 | /* If we get a JIT breakpoint event for this objfile, it is necessarily a |
1221 | JITer. */ | |
1222 | gdb_assert (jiter->jiter_data != nullptr); | |
1223 | ||
4efc6507 | 1224 | /* Read the descriptor from remote memory. */ |
fe053b9e | 1225 | if (!jit_read_descriptor (gdbarch, &descriptor, jiter)) |
03bef283 | 1226 | return; |
2340e834 | 1227 | CORE_ADDR entry_addr = descriptor.relevant_entry; |
4efc6507 | 1228 | |
1777feb0 | 1229 | /* Do the corresponding action. */ |
4efc6507 DE |
1230 | switch (descriptor.action_flag) |
1231 | { | |
1232 | case JIT_NOACTION: | |
1233 | break; | |
2340e834 | 1234 | |
4efc6507 | 1235 | case JIT_REGISTER: |
2340e834 SM |
1236 | { |
1237 | jit_code_entry code_entry; | |
1238 | jit_read_code_entry (gdbarch, entry_addr, &code_entry); | |
1239 | jit_register_code (gdbarch, entry_addr, &code_entry); | |
1240 | break; | |
1241 | } | |
1242 | ||
4efc6507 | 1243 | case JIT_UNREGISTER: |
2340e834 SM |
1244 | { |
1245 | objfile *jited = jit_find_objf_with_entry_addr (entry_addr); | |
1246 | if (jited == nullptr) | |
0fed7461 TT |
1247 | fprintf_unfiltered (gdb_stderr, |
1248 | _("Unable to find JITed code " | |
1249 | "entry at address: %s\n"), | |
1250 | paddress (gdbarch, entry_addr)); | |
2340e834 SM |
1251 | else |
1252 | jited->unlink (); | |
1253 | ||
1254 | break; | |
1255 | } | |
4efc6507 | 1256 | |
4efc6507 DE |
1257 | default: |
1258 | error (_("Unknown action_flag value in JIT descriptor!")); | |
1259 | break; | |
1260 | } | |
1261 | } | |
1262 | ||
3623dc3a SD |
1263 | /* Initialize the jit_gdbarch_data slot with an instance of struct |
1264 | jit_gdbarch_data_type */ | |
1265 | ||
1266 | static void * | |
1267 | jit_gdbarch_data_init (struct obstack *obstack) | |
1268 | { | |
8d749320 SM |
1269 | struct jit_gdbarch_data_type *data = |
1270 | XOBNEW (obstack, struct jit_gdbarch_data_type); | |
3623dc3a | 1271 | |
3623dc3a | 1272 | data->unwinder_registered = 0; |
8d749320 | 1273 | |
3623dc3a SD |
1274 | return data; |
1275 | } | |
1276 | ||
6c265988 | 1277 | void _initialize_jit (); |
4efc6507 | 1278 | void |
6c265988 | 1279 | _initialize_jit () |
4efc6507 | 1280 | { |
b8e0a31c | 1281 | jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR, |
3a90f266 | 1282 | JIT_READER_DIR_RELOCATABLE); |
062eaacb SM |
1283 | add_setshow_boolean_cmd ("jit", class_maintenance, &jit_debug, |
1284 | _("Set JIT debugging."), | |
1285 | _("Show JIT debugging."), | |
54ca9002 | 1286 | _("When set, JIT debugging is enabled."), |
062eaacb SM |
1287 | NULL, |
1288 | show_jit_debug, | |
1289 | &setdebuglist, &showdebuglist); | |
a255712f | 1290 | |
ff770835 SM |
1291 | add_cmd ("jit", class_maintenance, maint_info_jit_cmd, |
1292 | _("Print information about JIT-ed code objects."), | |
1293 | &maintenanceinfolist); | |
1294 | ||
c90e7d63 SM |
1295 | gdb::observers::inferior_created.attach (jit_inferior_created_hook, "jit"); |
1296 | gdb::observers::inferior_execd.attach (jit_inferior_created_hook, "jit"); | |
1297 | gdb::observers::inferior_exit.attach (jit_inferior_exit_hook, "jit"); | |
1298 | gdb::observers::breakpoint_deleted.attach (jit_breakpoint_deleted, "jit"); | |
f25c0135 | 1299 | |
3623dc3a | 1300 | jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init); |
784c47ee SD |
1301 | if (is_dl_available ()) |
1302 | { | |
6571a381 TT |
1303 | struct cmd_list_element *c; |
1304 | ||
1305 | c = add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\ | |
784c47ee SD |
1306 | Load FILE as debug info reader and unwinder for JIT compiled code.\n\ |
1307 | Usage: jit-reader-load FILE\n\ | |
1308 | Try to load file FILE as a debug info reader (and unwinder) for\n\ | |
1309 | JIT compiled code. The file is loaded from " JIT_READER_DIR ",\n\ | |
1310 | relocated relative to the GDB executable if required.")); | |
6571a381 TT |
1311 | set_cmd_completer (c, filename_completer); |
1312 | ||
1313 | c = add_com ("jit-reader-unload", no_class, | |
1314 | jit_reader_unload_command, _("\ | |
784c47ee | 1315 | Unload the currently loaded JIT debug info reader.\n\ |
6571a381 | 1316 | Usage: jit-reader-unload\n\n\ |
784c47ee | 1317 | Do \"help jit-reader-load\" for info on loading debug info readers.")); |
6571a381 | 1318 | set_cmd_completer (c, noop_completer); |
784c47ee | 1319 | } |
4efc6507 | 1320 | } |