Mercurial > hg > truffle
annotate src/os/bsd/dtrace/libjvm_db.c @ 13163:1baa169508f5
made DebugScope be AutoCloseable so that try-with-resource can be used to more cleanly manage scopes
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Mon, 25 Nov 2013 18:42:51 +0100 |
parents | da91efe96a93 |
children | fd94cbe7c5da |
rev | line source |
---|---|
4006 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
4006 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include <stdio.h> | |
26 #include <stdlib.h> | |
27 #include <string.h> | |
28 #include <errno.h> | |
29 // not available on macosx #include <gelf.h> | |
30 | |
31 #include "libjvm_db.h" | |
32 #include "JvmOffsets.h" | |
33 | |
34 #define LIBJVM_SO "libjvm.so" | |
35 | |
36 #if defined(i386) || defined(__i386) || defined(__amd64) | |
37 #ifdef COMPILER2 | |
38 #define X86_COMPILER2 | |
39 #endif /* COMPILER2 */ | |
40 #endif /* i386 */ | |
41 | |
42 typedef struct { | |
43 short vf_cnt; /* number of recognized java vframes */ | |
44 short bci; /* current frame method byte code index */ | |
45 int line; /* current frame method source line */ | |
46 uint64_t new_fp; /* fp for the next frame */ | |
47 uint64_t new_pc; /* pc for the next frame */ | |
48 uint64_t new_sp; /* "raw" sp for the next frame (includes extension by interpreter/adapter */ | |
49 char locinf; /* indicates there is valid location info */ | |
50 } Jframe_t; | |
51 | |
52 int Jlookup_by_regs(jvm_agent_t* J, const prgregset_t regs, char *name, | |
53 size_t size, Jframe_t *jframe); | |
54 | |
55 int main(int arg) { return arg; } | |
56 | |
57 static int debug = 0; | |
58 | |
59 static void failed(int err, const char * file, int line) { | |
60 if (debug) { | |
61 fprintf(stderr, "failed %d at %s:%d\n", err, file, line); | |
62 } | |
63 } | |
64 | |
65 static void warn(const char * file, int line, const char * msg) { | |
66 if (debug) { | |
67 fprintf(stderr, "warning: %s at %s:%d\n", msg, file, line); | |
68 } | |
69 } | |
70 | |
71 static void warn1(const char * file, int line, const char * msg, intptr_t arg1) { | |
72 if (debug) { | |
73 fprintf(stderr, "warning: "); | |
74 fprintf(stderr, msg, arg1); | |
75 fprintf(stderr, " at %s:%d\n", file, line); | |
76 } | |
77 } | |
78 | |
79 #define CHECK_FAIL(err) \ | |
80 if (err != PS_OK) { failed(err, __FILE__, __LINE__); goto fail; } | |
81 #define WARN(msg) warn(__FILE__, __LINE__, msg) | |
82 #define WARN1(msg, arg1) warn1(__FILE__, __LINE__, msg, arg1) | |
83 | |
84 typedef struct VMStructEntry { | |
85 const char * typeName; /* The type name containing the given field (example: "Klass") */ | |
86 const char * fieldName; /* The field name within the type (example: "_name") */ | |
87 uint64_t address; /* Address of field; only used for static fields */ | |
88 /* ("offset" can not be reused because of apparent SparcWorks compiler bug */ | |
89 /* in generation of initializer data) */ | |
90 } VMStructEntry; | |
91 | |
92 /* Prototyping inlined methods */ | |
93 | |
94 int sprintf(char *s, const char *format, ...); | |
95 | |
96 #define SZ16 sizeof(int16_t) | |
97 #define SZ32 sizeof(int32_t) | |
98 | |
99 #define COMP_METHOD_SIGN '*' | |
100 | |
101 #define MAX_VFRAMES_CNT 256 | |
102 | |
103 typedef struct vframe { | |
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104 uint64_t method; |
4006 | 105 int32_t sender_decode_offset; |
106 int32_t methodIdx; | |
107 int32_t bci; | |
108 int32_t line; | |
109 } Vframe_t; | |
110 | |
111 typedef struct frame { | |
112 uintptr_t fp; | |
113 uintptr_t pc; | |
114 uintptr_t sp; | |
115 uintptr_t sender_sp; // The unextended sp of the caller | |
116 } Frame_t; | |
117 | |
118 typedef struct Nmethod_t { | |
119 struct jvm_agent* J; | |
120 Jframe_t *jframe; | |
121 | |
122 uint64_t nm; /* _nmethod */ | |
123 uint64_t pc; | |
124 uint64_t pc_desc; | |
125 | |
126 int32_t orig_pc_offset; /* _orig_pc_offset */ | |
127 int32_t instrs_beg; /* _code_offset */ | |
128 int32_t instrs_end; | |
129 int32_t deopt_beg; /* _deoptimize_offset */ | |
130 int32_t scopes_data_beg; /* _scopes_data_offset */ | |
131 int32_t scopes_data_end; | |
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132 int32_t metadata_beg; /* _metadata_offset */ |
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133 int32_t metadata_end; |
4006 | 134 int32_t scopes_pcs_beg; /* _scopes_pcs_offset */ |
135 int32_t scopes_pcs_end; | |
136 | |
137 int vf_cnt; | |
138 Vframe_t vframes[MAX_VFRAMES_CNT]; | |
139 } Nmethod_t; | |
140 | |
141 struct jvm_agent { | |
142 struct ps_prochandle* P; | |
143 | |
144 uint64_t nmethod_vtbl; | |
145 uint64_t CodeBlob_vtbl; | |
146 uint64_t BufferBlob_vtbl; | |
147 uint64_t RuntimeStub_vtbl; | |
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148 uint64_t Method_vtbl; |
4006 | 149 |
150 uint64_t Use_Compressed_Oops_address; | |
151 uint64_t Universe_narrow_oop_base_address; | |
152 uint64_t Universe_narrow_oop_shift_address; | |
153 uint64_t CodeCache_heap_address; | |
154 | |
155 /* Volatiles */ | |
156 uint8_t Use_Compressed_Oops; | |
157 uint64_t Universe_narrow_oop_base; | |
158 uint32_t Universe_narrow_oop_shift; | |
159 uint64_t CodeCache_low; | |
160 uint64_t CodeCache_high; | |
161 uint64_t CodeCache_segmap_low; | |
162 uint64_t CodeCache_segmap_high; | |
163 | |
164 int32_t SIZE_CodeCache_log2_segment; | |
165 | |
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166 uint64_t methodPtr; |
4006 | 167 uint64_t bcx; |
168 | |
169 Nmethod_t *N; /*Inlined methods support */ | |
170 Frame_t prev_fr; | |
171 Frame_t curr_fr; | |
172 }; | |
173 | |
174 static int | |
175 read_string(struct ps_prochandle *P, | |
176 char *buf, /* caller's buffer */ | |
177 size_t size, /* upper limit on bytes to read */ | |
178 uintptr_t addr) /* address in process */ | |
179 { | |
180 int err = PS_OK; | |
181 while (size-- > 1 && err == PS_OK) { | |
182 err = ps_pread(P, addr, buf, 1); | |
183 if (*buf == '\0') { | |
184 return PS_OK; | |
185 } | |
186 addr += 1; | |
187 buf += 1; | |
188 } | |
189 return -1; | |
190 } | |
191 | |
192 static int read_compressed_pointer(jvm_agent_t* J, uint64_t base, uint32_t *ptr) { | |
193 int err = -1; | |
194 uint32_t ptr32; | |
195 err = ps_pread(J->P, base, &ptr32, sizeof(uint32_t)); | |
196 *ptr = ptr32; | |
197 return err; | |
198 } | |
199 | |
200 static int read_pointer(jvm_agent_t* J, uint64_t base, uint64_t* ptr) { | |
201 int err = -1; | |
202 uint32_t ptr32; | |
203 | |
204 switch (DATA_MODEL) { | |
205 case PR_MODEL_LP64: | |
206 err = ps_pread(J->P, base, ptr, sizeof(uint64_t)); | |
207 break; | |
208 case PR_MODEL_ILP32: | |
209 err = ps_pread(J->P, base, &ptr32, sizeof(uint32_t)); | |
210 *ptr = ptr32; | |
211 break; | |
212 } | |
213 | |
214 return err; | |
215 } | |
216 | |
217 static int read_string_pointer(jvm_agent_t* J, uint64_t base, const char ** stringp) { | |
218 uint64_t ptr; | |
219 int err; | |
220 char buffer[1024]; | |
221 | |
222 *stringp = NULL; | |
223 err = read_pointer(J, base, &ptr); | |
224 CHECK_FAIL(err); | |
225 if (ptr != 0) { | |
226 err = read_string(J->P, buffer, sizeof(buffer), ptr); | |
227 CHECK_FAIL(err); | |
228 *stringp = strdup(buffer); | |
229 } | |
230 return PS_OK; | |
231 | |
232 fail: | |
233 return err; | |
234 } | |
235 | |
236 static int parse_vmstruct_entry(jvm_agent_t* J, uint64_t base, VMStructEntry* vmp) { | |
237 uint64_t ptr; | |
238 int err; | |
239 | |
240 err = read_string_pointer(J, base + OFFSET_VMStructEntrytypeName, &vmp->typeName); | |
241 CHECK_FAIL(err); | |
242 err = read_string_pointer(J, base + OFFSET_VMStructEntryfieldName, &vmp->fieldName); | |
243 CHECK_FAIL(err); | |
244 err = read_pointer(J, base + OFFSET_VMStructEntryaddress, &vmp->address); | |
245 CHECK_FAIL(err); | |
246 | |
247 return PS_OK; | |
248 | |
249 fail: | |
250 if (vmp->typeName != NULL) free((void*)vmp->typeName); | |
251 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); | |
252 return err; | |
253 } | |
254 | |
255 static int parse_vmstructs(jvm_agent_t* J) { | |
256 VMStructEntry vmVar; | |
257 VMStructEntry* vmp = &vmVar; | |
258 uint64_t gHotSpotVMStructs; | |
259 psaddr_t sym_addr; | |
260 uint64_t base; | |
261 int err; | |
262 | |
263 err = ps_pglobal_lookup(J->P, LIBJVM_SO, "gHotSpotVMStructs", &sym_addr); | |
264 CHECK_FAIL(err); | |
265 err = read_pointer(J, sym_addr, &gHotSpotVMStructs); | |
266 CHECK_FAIL(err); | |
267 base = gHotSpotVMStructs; | |
268 | |
269 err = PS_OK; | |
270 while (err == PS_OK) { | |
271 memset(vmp, 0, sizeof(VMStructEntry)); | |
272 err = parse_vmstruct_entry(J, base, vmp); | |
273 if (err != PS_OK || vmp->typeName == NULL) { | |
274 break; | |
275 } | |
276 | |
277 if (vmp->typeName[0] == 'C' && strcmp("CodeCache", vmp->typeName) == 0) { | |
278 if (strcmp("_heap", vmp->fieldName) == 0) { | |
279 err = read_pointer(J, vmp->address, &J->CodeCache_heap_address); | |
280 } | |
281 } else if (vmp->typeName[0] == 'U' && strcmp("Universe", vmp->typeName) == 0) { | |
282 if (strcmp("_narrow_oop._base", vmp->fieldName) == 0) { | |
283 J->Universe_narrow_oop_base_address = vmp->address; | |
284 } | |
285 if (strcmp("_narrow_oop._shift", vmp->fieldName) == 0) { | |
286 J->Universe_narrow_oop_shift_address = vmp->address; | |
287 } | |
288 } | |
289 CHECK_FAIL(err); | |
290 | |
291 base += SIZE_VMStructEntry; | |
292 if (vmp->typeName != NULL) free((void*)vmp->typeName); | |
293 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); | |
294 } | |
295 | |
296 return PS_OK; | |
297 | |
298 fail: | |
299 if (vmp->typeName != NULL) free((void*)vmp->typeName); | |
300 if (vmp->fieldName != NULL) free((void*)vmp->fieldName); | |
301 return -1; | |
302 } | |
303 | |
304 static int find_symbol(jvm_agent_t* J, const char *name, uint64_t* valuep) { | |
305 psaddr_t sym_addr; | |
306 int err; | |
307 | |
308 err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr); | |
309 if (err != PS_OK) goto fail; | |
310 *valuep = sym_addr; | |
311 return PS_OK; | |
312 | |
313 fail: | |
314 return err; | |
315 } | |
316 | |
317 static int read_volatiles(jvm_agent_t* J) { | |
318 uint64_t ptr; | |
319 int err; | |
320 | |
321 err = find_symbol(J, "UseCompressedOops", &J->Use_Compressed_Oops_address); | |
322 if (err == PS_OK) { | |
323 err = ps_pread(J->P, J->Use_Compressed_Oops_address, &J->Use_Compressed_Oops, sizeof(uint8_t)); | |
324 CHECK_FAIL(err); | |
325 } else { | |
326 J->Use_Compressed_Oops = 0; | |
327 } | |
328 | |
329 err = read_pointer(J, J->Universe_narrow_oop_base_address, &J->Universe_narrow_oop_base); | |
330 CHECK_FAIL(err); | |
331 err = ps_pread(J->P, J->Universe_narrow_oop_shift_address, &J->Universe_narrow_oop_shift, sizeof(uint32_t)); | |
332 CHECK_FAIL(err); | |
333 | |
334 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_memory + | |
335 OFFSET_VirtualSpace_low, &J->CodeCache_low); | |
336 CHECK_FAIL(err); | |
337 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_memory + | |
338 OFFSET_VirtualSpace_high, &J->CodeCache_high); | |
339 CHECK_FAIL(err); | |
340 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_segmap + | |
341 OFFSET_VirtualSpace_low, &J->CodeCache_segmap_low); | |
342 CHECK_FAIL(err); | |
343 err = read_pointer(J, J->CodeCache_heap_address + OFFSET_CodeHeap_segmap + | |
344 OFFSET_VirtualSpace_high, &J->CodeCache_segmap_high); | |
345 CHECK_FAIL(err); | |
346 | |
347 err = ps_pread(J->P, J->CodeCache_heap_address + OFFSET_CodeHeap_log2_segment_size, | |
348 &J->SIZE_CodeCache_log2_segment, sizeof(J->SIZE_CodeCache_log2_segment)); | |
349 CHECK_FAIL(err); | |
350 | |
351 return PS_OK; | |
352 | |
353 fail: | |
354 return err; | |
355 } | |
356 | |
357 | |
358 static int codecache_contains(jvm_agent_t* J, uint64_t ptr) { | |
359 /* make sure the code cache is up to date */ | |
360 return (J->CodeCache_low <= ptr && ptr < J->CodeCache_high); | |
361 } | |
362 | |
363 static uint64_t segment_for(jvm_agent_t* J, uint64_t p) { | |
364 return (p - J->CodeCache_low) >> J->SIZE_CodeCache_log2_segment; | |
365 } | |
366 | |
367 static uint64_t block_at(jvm_agent_t* J, int i) { | |
368 return J->CodeCache_low + (i << J->SIZE_CodeCache_log2_segment); | |
369 } | |
370 | |
371 static int find_start(jvm_agent_t* J, uint64_t ptr, uint64_t *startp) { | |
372 int err; | |
373 | |
374 *startp = 0; | |
375 if (J->CodeCache_low <= ptr && ptr < J->CodeCache_high) { | |
376 int32_t used; | |
377 uint64_t segment = segment_for(J, ptr); | |
378 uint64_t block = J->CodeCache_segmap_low; | |
379 uint8_t tag; | |
380 err = ps_pread(J->P, block + segment, &tag, sizeof(tag)); | |
381 CHECK_FAIL(err); | |
382 if (tag == 0xff) | |
383 return PS_OK; | |
384 while (tag > 0) { | |
385 err = ps_pread(J->P, block + segment, &tag, sizeof(tag)); | |
386 CHECK_FAIL(err); | |
387 segment -= tag; | |
388 } | |
389 block = block_at(J, segment); | |
390 err = ps_pread(J->P, block + OFFSET_HeapBlockHeader_used, &used, sizeof(used)); | |
391 CHECK_FAIL(err); | |
392 if (used) { | |
393 *startp = block + SIZE_HeapBlockHeader; | |
394 } | |
395 } | |
396 return PS_OK; | |
397 | |
398 fail: | |
399 return -1; | |
400 } | |
401 | |
402 static int find_jlong_constant(jvm_agent_t* J, const char *name, uint64_t* valuep) { | |
403 psaddr_t sym_addr; | |
404 int err = ps_pglobal_lookup(J->P, LIBJVM_SO, name, &sym_addr); | |
405 if (err == PS_OK) { | |
406 err = ps_pread(J->P, sym_addr, valuep, sizeof(uint64_t)); | |
407 return err; | |
408 } | |
409 *valuep = -1; | |
410 return -1; | |
411 } | |
412 | |
413 jvm_agent_t *Jagent_create(struct ps_prochandle *P, int vers) { | |
414 jvm_agent_t* J; | |
415 int err; | |
416 | |
417 if (vers != JVM_DB_VERSION) { | |
418 errno = ENOTSUP; | |
419 return NULL; | |
420 } | |
421 | |
422 J = (jvm_agent_t*)calloc(sizeof(struct jvm_agent), 1); | |
423 | |
424 debug = getenv("LIBJVMDB_DEBUG") != NULL; | |
425 if (debug) debug = 3; | |
426 | |
427 if (debug) { | |
428 fprintf(stderr, "Jagent_create: debug=%d\n", debug); | |
429 #ifdef X86_COMPILER2 | |
430 fprintf(stderr, "Jagent_create: R_SP=%d, R_FP=%d, POINTER_SIZE=%d\n", R_SP, R_FP, POINTER_SIZE); | |
431 #endif /* X86_COMPILER2 */ | |
432 } | |
433 | |
434 J->P = P; | |
435 | |
436 // Initialize the initial previous frame | |
437 | |
438 J->prev_fr.fp = 0; | |
439 J->prev_fr.pc = 0; | |
440 J->prev_fr.sp = 0; | |
441 J->prev_fr.sender_sp = 0; | |
442 | |
443 err = find_symbol(J, "__1cHnmethodG__vtbl_", &J->nmethod_vtbl); | |
444 CHECK_FAIL(err); | |
445 err = find_symbol(J, "__1cKBufferBlobG__vtbl_", &J->BufferBlob_vtbl); | |
446 if (err != PS_OK) J->BufferBlob_vtbl = 0; | |
447 err = find_symbol(J, "__1cICodeBlobG__vtbl_", &J->CodeBlob_vtbl); | |
448 CHECK_FAIL(err); | |
449 err = find_symbol(J, "__1cLRuntimeStubG__vtbl_", &J->RuntimeStub_vtbl); | |
450 CHECK_FAIL(err); | |
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451 err = find_symbol(J, "__1cNMethodG__vtbl_", &J->Method_vtbl); |
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452 CHECK_FAIL(err); |
4006 | 453 |
454 err = parse_vmstructs(J); | |
455 CHECK_FAIL(err); | |
456 err = read_volatiles(J); | |
457 CHECK_FAIL(err); | |
458 | |
459 return J; | |
460 | |
461 fail: | |
462 Jagent_destroy(J); | |
463 return NULL; | |
464 } | |
465 | |
466 void Jagent_destroy(jvm_agent_t *J) { | |
467 if (J != NULL) { | |
468 free(J); | |
469 } | |
470 } | |
471 | |
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472 static int is_method(jvm_agent_t* J, uint64_t methodPtr) { |
4006 | 473 uint64_t klass; |
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474 int err = read_pointer(J, methodPtr, &klass); |
4006 | 475 if (err != PS_OK) goto fail; |
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476 return klass == J->Method_vtbl; |
4006 | 477 |
478 fail: | |
479 return 0; | |
480 } | |
481 | |
482 static int | |
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483 name_for_methodPtr(jvm_agent_t* J, uint64_t methodPtr, char * result, size_t size) |
4006 | 484 { |
485 short nameIndex; | |
486 short signatureIndex; | |
487 uint64_t constantPool; | |
488 uint64_t constMethod; | |
489 uint64_t nameSymbol; | |
490 uint64_t signatureSymbol; | |
491 uint64_t klassPtr; | |
492 uint64_t klassSymbol; | |
493 short klassSymbolLength; | |
494 short nameSymbolLength; | |
495 short signatureSymbolLength; | |
496 char * nameString = NULL; | |
497 char * klassString = NULL; | |
498 char * signatureString = NULL; | |
499 int err; | |
500 | |
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501 err = read_pointer(J, methodPtr + OFFSET_Method_constMethod, &constMethod); |
4006 | 502 CHECK_FAIL(err); |
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503 err = read_pointer(J, constMethod + OFFSET_ConstMethod_constants, &constantPool); |
4006 | 504 CHECK_FAIL(err); |
505 | |
506 /* To get name string */ | |
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507 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_name_index, &nameIndex, 2); |
4006 | 508 CHECK_FAIL(err); |
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509 err = read_pointer(J, constantPool + nameIndex * POINTER_SIZE + SIZE_ConstantPool, &nameSymbol); |
4006 | 510 CHECK_FAIL(err); |
511 // The symbol is a CPSlot and has lower bit set to indicate metadata | |
512 nameSymbol &= (~1); // remove metadata lsb | |
513 err = ps_pread(J->P, nameSymbol + OFFSET_Symbol_length, &nameSymbolLength, 2); | |
514 CHECK_FAIL(err); | |
515 nameString = (char*)calloc(nameSymbolLength + 1, 1); | |
516 err = ps_pread(J->P, nameSymbol + OFFSET_Symbol_body, nameString, nameSymbolLength); | |
517 CHECK_FAIL(err); | |
518 | |
519 /* To get signature string */ | |
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520 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_signature_index, &signatureIndex, 2); |
4006 | 521 CHECK_FAIL(err); |
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522 err = read_pointer(J, constantPool + signatureIndex * POINTER_SIZE + SIZE_ConstantPool, &signatureSymbol); |
4006 | 523 CHECK_FAIL(err); |
524 signatureSymbol &= (~1); // remove metadata lsb | |
525 err = ps_pread(J->P, signatureSymbol + OFFSET_Symbol_length, &signatureSymbolLength, 2); | |
526 CHECK_FAIL(err); | |
527 signatureString = (char*)calloc(signatureSymbolLength + 1, 1); | |
528 err = ps_pread(J->P, signatureSymbol + OFFSET_Symbol_body, signatureString, signatureSymbolLength); | |
529 CHECK_FAIL(err); | |
530 | |
531 /* To get klass string */ | |
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532 err = read_pointer(J, constantPool + OFFSET_ConstantPool_pool_holder, &klassPtr); |
4006 | 533 CHECK_FAIL(err); |
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534 err = read_pointer(J, klassPtr + OFFSET_Klass_name, &klassSymbol); |
4006 | 535 CHECK_FAIL(err); |
536 err = ps_pread(J->P, klassSymbol + OFFSET_Symbol_length, &klassSymbolLength, 2); | |
537 CHECK_FAIL(err); | |
538 klassString = (char*)calloc(klassSymbolLength + 1, 1); | |
539 err = ps_pread(J->P, klassSymbol + OFFSET_Symbol_body, klassString, klassSymbolLength); | |
540 CHECK_FAIL(err); | |
541 | |
542 result[0] = '\0'; | |
543 strncat(result, klassString, size); | |
544 size -= strlen(klassString); | |
545 strncat(result, ".", size); | |
546 size -= 1; | |
547 strncat(result, nameString, size); | |
548 size -= strlen(nameString); | |
549 strncat(result, signatureString, size); | |
550 | |
551 if (nameString != NULL) free(nameString); | |
552 if (klassString != NULL) free(klassString); | |
553 if (signatureString != NULL) free(signatureString); | |
554 | |
555 return PS_OK; | |
556 | |
557 fail: | |
558 if (debug) { | |
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559 fprintf(stderr, "name_for_methodPtr: FAIL \n\n"); |
4006 | 560 } |
561 if (nameString != NULL) free(nameString); | |
562 if (klassString != NULL) free(klassString); | |
563 if (signatureString != NULL) free(signatureString); | |
564 return -1; | |
565 } | |
566 | |
567 static int nmethod_info(Nmethod_t *N) | |
568 { | |
569 jvm_agent_t *J = N->J; | |
570 uint64_t nm = N->nm; | |
571 int32_t err; | |
572 | |
573 if (debug > 2 ) | |
574 fprintf(stderr, "\t nmethod_info: BEGIN \n"); | |
575 | |
576 /* Instructions */ | |
577 err = ps_pread(J->P, nm + OFFSET_CodeBlob_code_offset, &N->instrs_beg, SZ32); | |
578 CHECK_FAIL(err); | |
579 err = ps_pread(J->P, nm + OFFSET_CodeBlob_data_offset, &N->instrs_end, SZ32); | |
580 CHECK_FAIL(err); | |
581 err = ps_pread(J->P, nm + OFFSET_nmethod_deoptimize_offset, &N->deopt_beg, SZ32); | |
582 CHECK_FAIL(err); | |
583 err = ps_pread(J->P, nm + OFFSET_nmethod_orig_pc_offset, &N->orig_pc_offset, SZ32); | |
584 CHECK_FAIL(err); | |
585 | |
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586 /* Metadata */ |
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587 err = ps_pread(J->P, nm + OFFSET_nmethod_metadata_offset, &N->metadata_beg, SZ32); |
4006 | 588 CHECK_FAIL(err); |
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589 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_data_offset, &N->metadata_end, SZ32); |
4006 | 590 CHECK_FAIL(err); |
591 | |
592 /* scopes_pcs */ | |
593 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_pcs_offset, &N->scopes_pcs_beg, SZ32); | |
594 CHECK_FAIL(err); | |
595 err = ps_pread(J->P, nm + OFFSET_nmethod_handler_table_offset, &N->scopes_pcs_end, SZ32); | |
596 CHECK_FAIL(err); | |
597 | |
598 /* scopes_data */ | |
599 err = ps_pread(J->P, nm + OFFSET_nmethod_scopes_data_offset, &N->scopes_data_beg, SZ32); | |
600 CHECK_FAIL(err); | |
601 | |
602 if (debug > 2 ) { | |
603 N->scopes_data_end = N->scopes_pcs_beg; | |
604 | |
605 fprintf(stderr, "\t nmethod_info: instrs_beg: %#x, instrs_end: %#x\n", | |
606 N->instrs_beg, N->instrs_end); | |
607 | |
608 fprintf(stderr, "\t nmethod_info: deopt_beg: %#x \n", | |
609 N->deopt_beg); | |
610 | |
611 fprintf(stderr, "\t nmethod_info: orig_pc_offset: %#x \n", | |
612 N->orig_pc_offset); | |
613 | |
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614 fprintf(stderr, "\t nmethod_info: metadata_beg: %#x, metadata_end: %#x\n", |
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615 N->metadata_beg, N->metadata_end); |
4006 | 616 |
617 fprintf(stderr, "\t nmethod_info: scopes_data_beg: %#x, scopes_data_end: %#x\n", | |
618 N->scopes_data_beg, N->scopes_data_end); | |
619 | |
620 fprintf(stderr, "\t nmethod_info: scopes_pcs_beg: %#x, scopes_pcs_end: %#x\n", | |
621 N->scopes_pcs_beg, N->scopes_pcs_end); | |
622 | |
623 fprintf(stderr, "\t nmethod_info: END \n\n"); | |
624 } | |
625 return PS_OK; | |
626 | |
627 fail: | |
628 return err; | |
629 } | |
630 | |
631 static int | |
632 raw_read_int(jvm_agent_t* J, uint64_t *buffer, int32_t *val) | |
633 { | |
634 int shift = 0; | |
635 int value = 0; | |
636 uint8_t ch = 0; | |
637 int32_t err; | |
638 int32_t sum; | |
639 // Constants for UNSIGNED5 coding of Pack200 | |
640 // see compressedStream.hpp | |
641 enum { | |
642 lg_H = 6, | |
643 H = 1<<lg_H, | |
644 BitsPerByte = 8, | |
645 L = (1<<BitsPerByte)-H, | |
646 }; | |
647 int i; | |
648 | |
649 err = ps_pread(J->P, (*buffer)++, &ch, sizeof(uint8_t)); | |
650 CHECK_FAIL(err); | |
651 if (debug > 2) | |
652 fprintf(stderr, "\t\t\t raw_read_int: *buffer: %#llx, ch: %#x\n", *buffer, ch); | |
653 | |
654 sum = ch; | |
655 if ( sum >= L ) { | |
656 int32_t lg_H_i = lg_H; | |
657 // Read maximum of 5 total bytes (we've already read 1). | |
658 // See CompressedReadStream::read_int_mb | |
659 for ( i = 0; i < 4; i++) { | |
660 err = ps_pread(J->P, (*buffer)++, &ch, sizeof(uint8_t)); | |
661 CHECK_FAIL(err); | |
662 sum += ch << lg_H_i; | |
663 if (ch < L ) { | |
664 *val = sum; | |
665 return PS_OK; | |
666 } | |
667 lg_H_i += lg_H; | |
668 } | |
669 } | |
670 *val = sum; | |
671 return PS_OK; | |
672 | |
673 fail: | |
674 return err; | |
675 } | |
676 | |
677 static int | |
678 read_pair(jvm_agent_t* J, uint64_t *buffer, int32_t *bci, int32_t *line) | |
679 { | |
680 uint8_t next = 0; | |
681 int32_t bci_delta; | |
682 int32_t line_delta; | |
683 int32_t err; | |
684 | |
685 if (debug > 2) | |
686 fprintf(stderr, "\t\t read_pair: BEGIN\n"); | |
687 | |
688 err = ps_pread(J->P, (*buffer)++, &next, sizeof(uint8_t)); | |
689 CHECK_FAIL(err); | |
690 | |
691 if (next == 0) { | |
692 if (debug > 2) | |
693 fprintf(stderr, "\t\t read_pair: END: next == 0\n"); | |
694 return 1; /* stream terminated */ | |
695 } | |
696 if (next == 0xFF) { | |
697 if (debug > 2) | |
698 fprintf(stderr, "\t\t read_pair: END: next == 0xFF\n"); | |
699 | |
700 /* Escape character, regular compression used */ | |
701 | |
702 err = raw_read_int(J, buffer, &bci_delta); | |
703 CHECK_FAIL(err); | |
704 | |
705 err = raw_read_int(J, buffer, &line_delta); | |
706 CHECK_FAIL(err); | |
707 | |
708 *bci += bci_delta; | |
709 *line += line_delta; | |
710 | |
711 if (debug > 2) { | |
712 fprintf(stderr, "\t\t read_pair: delta = (line %d: %d)\n", | |
713 line_delta, bci_delta); | |
714 fprintf(stderr, "\t\t read_pair: unpack= (line %d: %d)\n", | |
715 *line, *bci); | |
716 } | |
717 } else { | |
718 /* Single byte compression used */ | |
719 *bci += next >> 3; | |
720 *line += next & 0x7; | |
721 if (debug > 2) { | |
722 fprintf(stderr, "\t\t read_pair: delta = (line %d: %d)\n", | |
723 next & 0x7, next >> 3); | |
724 fprintf(stderr, "\t\t read_pair: unpack= (line %d: %d)\n", | |
725 *line, *bci); | |
726 } | |
727 } | |
728 if (debug > 2) | |
729 fprintf(stderr, "\t\t read_pair: END\n"); | |
730 return PS_OK; | |
731 | |
732 fail: | |
733 if (debug) | |
734 fprintf(stderr, "\t\t read_pair: FAIL\n"); | |
735 return err; | |
736 } | |
737 | |
738 static int | |
739 line_number_from_bci(jvm_agent_t* J, Vframe_t *vf) | |
740 { | |
741 uint64_t buffer; | |
742 uint16_t code_size; | |
743 uint64_t code_end_delta; | |
744 uint64_t constMethod; | |
745 int8_t access_flags; | |
746 int32_t best_bci = 0; | |
747 int32_t stream_bci = 0; | |
748 int32_t stream_line = 0; | |
749 int32_t err; | |
750 | |
751 if (debug > 2) { | |
752 char name[256]; | |
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753 err = name_for_methodPtr(J, vf->method, name, 256); |
4006 | 754 CHECK_FAIL(err); |
755 fprintf(stderr, "\t line_number_from_bci: BEGIN, method name: %s, targ bci: %d\n", | |
756 name, vf->bci); | |
757 } | |
758 | |
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759 err = read_pointer(J, vf->method + OFFSET_Method_constMethod, &constMethod); |
4006 | 760 CHECK_FAIL(err); |
761 | |
762 vf->line = 0; | |
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763 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_flags, &access_flags, sizeof(int8_t)); |
4006 | 764 CHECK_FAIL(err); |
765 | |
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766 if (!(access_flags & ConstMethod_has_linenumber_table)) { |
4006 | 767 if (debug > 2) |
768 fprintf(stderr, "\t line_number_from_bci: END: !HAS_LINE_NUMBER_TABLE \n\n"); | |
769 return PS_OK; | |
770 } | |
771 | |
772 /* The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
773 * Not necessarily sorted and not necessarily one-to-one. | |
774 */ | |
775 | |
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776 err = ps_pread(J->P, constMethod + OFFSET_ConstMethod_code_size, &code_size, SZ16); |
4006 | 777 CHECK_FAIL(err); |
778 | |
779 /* inlined_table_start() */ | |
780 code_end_delta = (uint64_t) (access_flags & AccessFlags_NATIVE) ? 2*POINTER_SIZE : 0; | |
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781 buffer = constMethod + (uint64_t) SIZE_ConstMethod + (uint64_t) code_size + code_end_delta; |
4006 | 782 |
783 if (debug > 2) { | |
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784 fprintf(stderr, "\t\t line_number_from_bci: method: %#llx, native: %d\n", |
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785 vf->method, (access_flags & AccessFlags_NATIVE)); |
4006 | 786 fprintf(stderr, "\t\t line_number_from_bci: buffer: %#llx, code_size: %d\n", |
787 buffer, (int) code_size); | |
788 } | |
789 | |
790 while (read_pair(J, &buffer, &stream_bci, &stream_line) == 0) { | |
791 if (stream_bci == vf->bci) { | |
792 /* perfect match */ | |
793 if (debug > 2) | |
794 fprintf(stderr, "\t line_number_from_bci: END: exact line: %ld \n\n", vf->line); | |
795 vf->line = stream_line; | |
796 return PS_OK; | |
797 } else { | |
798 /* update best_bci/line */ | |
799 if (stream_bci < vf->bci && stream_bci >= best_bci) { | |
800 best_bci = stream_bci; | |
801 vf->line = stream_line; | |
802 if (debug > 2) { | |
803 fprintf(stderr, "\t line_number_from_bci: best_bci: %ld, best_line: %ld\n", | |
804 best_bci, vf->line); | |
805 } | |
806 } | |
807 } | |
808 } | |
809 if (debug > 2) | |
810 fprintf(stderr, "\t line_number_from_bci: END: line: %ld \n\n", vf->line); | |
811 return PS_OK; | |
812 | |
813 fail: | |
814 if (debug) | |
815 fprintf(stderr, "\t line_number_from_bci: FAIL\n"); | |
816 return err; | |
817 } | |
818 | |
819 static int | |
820 get_real_pc(Nmethod_t *N, uint64_t pc_desc, uint64_t *real_pc) | |
821 { | |
822 int32_t pc_offset; | |
823 int32_t err; | |
824 | |
825 err = ps_pread(N->J->P, pc_desc + OFFSET_PcDesc_pc_offset, &pc_offset, SZ32); | |
826 CHECK_FAIL(err); | |
827 | |
828 *real_pc = N->nm + N->instrs_beg + pc_offset; | |
829 if (debug > 2) { | |
830 fprintf(stderr, "\t\t get_real_pc: pc_offset: %lx, real_pc: %llx\n", | |
831 pc_offset, *real_pc); | |
832 } | |
833 return PS_OK; | |
834 | |
835 fail: | |
836 return err; | |
837 } | |
838 | |
839 /* Finds a PcDesc with real-pc equal to N->pc */ | |
840 static int pc_desc_at(Nmethod_t *N) | |
841 { | |
842 uint64_t pc_diff; | |
843 int32_t offs; | |
844 int32_t err; | |
845 | |
846 if (debug > 2) | |
847 fprintf(stderr, "\t pc_desc_at: BEGIN\n"); | |
848 | |
849 N->vf_cnt = 0; | |
850 N->pc_desc = 0; | |
851 | |
852 for (offs = N->scopes_pcs_beg; offs < N->scopes_pcs_end; offs += SIZE_PcDesc) { | |
853 uint64_t pd; | |
854 uint64_t best_pc_diff = 16; /* some approximation */ | |
855 uint64_t real_pc = 0; | |
856 | |
857 pd = N->nm + offs; | |
858 err = get_real_pc(N, pd, &real_pc); | |
859 CHECK_FAIL(err); | |
860 | |
861 pc_diff = real_pc - N->pc; | |
862 | |
863 /* In general, this fragment should work */ | |
864 if (pc_diff == 0) { | |
865 N->pc_desc = pd; | |
866 if (debug) { | |
867 fprintf(stderr, "\t pc_desc_at: END: pc_desc: FOUND: %#lx \n\n", pd); | |
868 } | |
869 return PS_OK; | |
870 } | |
871 /* This fragment is to be able to find out an appropriate | |
872 * pc_desc entry even if pc_desc info is inaccurate. | |
873 */ | |
874 if (best_pc_diff > pc_diff && pc_diff > 0) { | |
875 best_pc_diff = pc_diff; | |
876 N->pc_desc = pd; | |
877 } | |
878 } | |
879 if (debug) { | |
880 fprintf(stderr, "\t pc_desc_at: END: pc_desc NOT FOUND"); | |
881 if (pc_diff < 20) | |
882 fprintf(stderr, ", best pc_diff: %d\n\n", pc_diff); | |
883 else | |
884 fprintf(stderr, "\n\n"); | |
885 } | |
886 return PS_OK; | |
887 | |
888 fail: | |
889 return err; | |
890 } | |
891 | |
892 static int | |
893 scope_desc_at(Nmethod_t *N, int32_t decode_offset, Vframe_t *vf) | |
894 { | |
895 uint64_t buffer; | |
896 int32_t err; | |
897 | |
898 if (debug > 2) { | |
899 fprintf(stderr, "\t\t scope_desc_at: BEGIN \n"); | |
900 } | |
901 | |
902 buffer = N->nm + N->scopes_data_beg + decode_offset; | |
903 | |
904 err = raw_read_int(N->J, &buffer, &vf->sender_decode_offset); | |
905 CHECK_FAIL(err); | |
906 | |
907 err = raw_read_int(N->J, &buffer, &vf->methodIdx); | |
908 CHECK_FAIL(err); | |
909 | |
910 err = raw_read_int(N->J, &buffer, &vf->bci); | |
911 CHECK_FAIL(err); | |
912 | |
913 if (debug > 2) { | |
914 fprintf(stderr, "\t\t scope_desc_at: sender_decode_offset: %#x\n", | |
915 vf->sender_decode_offset); | |
916 fprintf(stderr, "\t\t scope_desc_at: methodIdx: %d\n", vf->methodIdx); | |
917 fprintf(stderr, "\t\t scope_desc_at: bci: %d\n", vf->bci); | |
918 | |
919 fprintf(stderr, "\t\t scope_desc_at: END \n\n"); | |
920 } | |
921 return PS_OK; | |
922 | |
923 fail: | |
924 return err; | |
925 } | |
926 | |
927 static int scopeDesc_chain(Nmethod_t *N) { | |
928 int32_t decode_offset = 0; | |
929 int32_t err; | |
930 | |
931 if (debug > 2) { | |
932 fprintf(stderr, "\t scopeDesc_chain: BEGIN\n"); | |
933 } | |
934 | |
935 err = ps_pread(N->J->P, N->pc_desc + OFFSET_PcDesc_scope_decode_offset, | |
936 &decode_offset, SZ32); | |
937 CHECK_FAIL(err); | |
938 | |
939 while (decode_offset > 0) { | |
940 Vframe_t *vf = &N->vframes[N->vf_cnt]; | |
941 | |
942 if (debug > 2) { | |
943 fprintf(stderr, "\t scopeDesc_chain: decode_offset: %#x\n", decode_offset); | |
944 } | |
945 | |
946 err = scope_desc_at(N, decode_offset, vf); | |
947 CHECK_FAIL(err); | |
948 | |
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949 if (vf->methodIdx > ((N->metadata_end - N->metadata_beg) / POINTER_SIZE)) { |
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950 fprintf(stderr, "\t scopeDesc_chain: (methodIdx > metadata length) !\n"); |
4006 | 951 return -1; |
952 } | |
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953 err = read_pointer(N->J, N->nm + N->metadata_beg + (vf->methodIdx-1)*POINTER_SIZE, |
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954 &vf->method); |
4006 | 955 CHECK_FAIL(err); |
956 | |
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957 if (vf->method) { |
4006 | 958 N->vf_cnt++; |
959 err = line_number_from_bci(N->J, vf); | |
960 CHECK_FAIL(err); | |
961 if (debug > 2) { | |
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962 fprintf(stderr, "\t scopeDesc_chain: method: %#8llx, line: %ld\n", |
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963 vf->method, vf->line); |
4006 | 964 } |
965 } | |
966 decode_offset = vf->sender_decode_offset; | |
967 } | |
968 if (debug > 2) { | |
969 fprintf(stderr, "\t scopeDesc_chain: END \n\n"); | |
970 } | |
971 return PS_OK; | |
972 | |
973 fail: | |
974 if (debug) { | |
975 fprintf(stderr, "\t scopeDesc_chain: FAIL \n\n"); | |
976 } | |
977 return err; | |
978 } | |
979 | |
980 | |
981 static int | |
982 name_for_nmethod(jvm_agent_t* J, | |
983 uint64_t nm, | |
984 uint64_t pc, | |
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985 uint64_t method, |
4006 | 986 char *result, |
987 size_t size, | |
988 Jframe_t *jframe | |
989 ) { | |
990 Nmethod_t *N; | |
991 Vframe_t *vf; | |
992 int32_t err; | |
993 int deoptimized = 0; | |
994 | |
995 if (debug) { | |
996 fprintf(stderr, "name_for_nmethod: BEGIN: nmethod: %#llx, pc: %#llx\n", nm, pc); | |
997 } | |
998 if (J->N == NULL) { | |
999 J->N = (Nmethod_t *) malloc(sizeof(Nmethod_t)); | |
1000 } | |
1001 memset(J->N, 0, sizeof(Nmethod_t)); /* Initial stat: all values are zeros */ | |
1002 N = J->N; | |
1003 N->J = J; | |
1004 N->nm = nm; | |
1005 N->pc = pc; | |
1006 N->jframe = jframe; | |
1007 | |
1008 err = nmethod_info(N); | |
1009 CHECK_FAIL(err); | |
1010 if (debug) { | |
1011 fprintf(stderr, "name_for_nmethod: pc: %#llx, deopt_pc: %#llx\n", | |
1012 pc, N->nm + N->deopt_beg); | |
1013 } | |
1014 | |
1015 /* check for a deoptimized frame */ | |
1016 if ( pc == N->nm + N->deopt_beg) { | |
1017 uint64_t base; | |
1018 if (debug) { | |
1019 fprintf(stderr, "name_for_nmethod: found deoptimized frame\n"); | |
1020 } | |
1021 if (J->prev_fr.sender_sp != 0) { | |
1022 base = J->prev_fr.sender_sp + N->orig_pc_offset; | |
1023 } else { | |
1024 base = J->curr_fr.sp + N->orig_pc_offset; | |
1025 } | |
1026 err = read_pointer(J, base, &N->pc); | |
1027 CHECK_FAIL(err); | |
1028 if (debug) { | |
1029 fprintf(stderr, "name_for_nmethod: found deoptimized frame converting pc from %#8llx to %#8llx\n", | |
1030 pc, N->pc); | |
1031 } | |
1032 deoptimized = 1; | |
1033 } | |
1034 | |
1035 err = pc_desc_at(N); | |
1036 CHECK_FAIL(err); | |
1037 | |
1038 if (N->pc_desc > 0) { | |
1039 jframe->locinf = 1; | |
1040 err = scopeDesc_chain(N); | |
1041 CHECK_FAIL(err); | |
1042 } | |
1043 result[0] = COMP_METHOD_SIGN; | |
1044 vf = &N->vframes[0]; | |
1045 if (N->vf_cnt > 0) { | |
1046 jframe->vf_cnt = N->vf_cnt; | |
1047 jframe->bci = vf->bci; | |
1048 jframe->line = vf->line; | |
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1049 err = name_for_methodPtr(J, N->vframes[0].method, result+1, size-1); |
4006 | 1050 CHECK_FAIL(err); |
1051 } else { | |
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1052 err = name_for_methodPtr(J, method, result+1, size-1); |
4006 | 1053 CHECK_FAIL(err); |
1054 } | |
1055 if (deoptimized) { | |
1056 strncat(result + 1, " [deoptimized frame]; ", size-1); | |
1057 } else { | |
1058 strncat(result + 1, " [compiled] ", size-1); | |
1059 } | |
1060 if (debug) | |
1061 fprintf(stderr, "name_for_nmethod: END: method name: %s, vf_cnt: %d\n\n", | |
1062 result, N->vf_cnt); | |
1063 return PS_OK; | |
1064 | |
1065 fail: | |
1066 if (debug) | |
1067 fprintf(stderr, "name_for_nmethod: FAIL \n\n"); | |
1068 return err; | |
1069 } | |
1070 | |
1071 int is_bci(intptr_t bcx) { | |
1072 switch (DATA_MODEL) { | |
1073 case PR_MODEL_LP64: | |
1074 return ((uintptr_t) bcx) <= ((uintptr_t) MAX_METHOD_CODE_SIZE) ; | |
1075 case PR_MODEL_ILP32: | |
1076 default: | |
1077 return 0 <= bcx && bcx <= MAX_METHOD_CODE_SIZE; | |
1078 } | |
1079 } | |
1080 | |
1081 static int | |
1082 name_for_imethod(jvm_agent_t* J, | |
1083 uint64_t bcx, | |
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1084 uint64_t method, |
4006 | 1085 char *result, |
1086 size_t size, | |
1087 Jframe_t *jframe | |
1088 ) { | |
1089 uint64_t bci; | |
1090 uint64_t constMethod; | |
1091 Vframe_t vframe = {0}; | |
1092 Vframe_t *vf = &vframe; | |
1093 int32_t err; | |
1094 | |
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1095 err = read_pointer(J, method + OFFSET_Method_constMethod, &constMethod); |
4006 | 1096 CHECK_FAIL(err); |
1097 | |
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1098 bci = is_bci(bcx) ? bcx : bcx - (constMethod + (uint64_t) SIZE_ConstMethod); |
4006 | 1099 |
1100 if (debug) | |
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1101 fprintf(stderr, "\t name_for_imethod: BEGIN: method: %#llx\n", method); |
4006 | 1102 |
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1103 err = name_for_methodPtr(J, method, result, size); |
4006 | 1104 CHECK_FAIL(err); |
1105 if (debug) | |
1106 fprintf(stderr, "\t name_for_imethod: method name: %s\n", result); | |
1107 | |
1108 if (bci > 0) { | |
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1109 vf->method = method; |
4006 | 1110 vf->bci = bci; |
1111 err = line_number_from_bci(J, vf); | |
1112 CHECK_FAIL(err); | |
1113 } | |
1114 jframe->bci = vf->bci; | |
1115 jframe->line = vf->line; | |
1116 jframe->locinf = 1; | |
1117 | |
1118 if (debug) { | |
1119 fprintf(stderr, "\t name_for_imethod: END: bci: %d, line: %d\n\n", | |
1120 vf->bci, vf->line); | |
1121 } | |
1122 return PS_OK; | |
1123 | |
1124 fail: | |
1125 if (debug) | |
1126 fprintf(stderr, "\t name_for_imethod: FAIL\n"); | |
1127 return err; | |
1128 } | |
1129 | |
1130 static int | |
1131 name_for_codecache(jvm_agent_t* J, uint64_t fp, uint64_t pc, char * result, | |
1132 size_t size, Jframe_t *jframe, int* is_interpreted) | |
1133 { | |
1134 uint64_t start; | |
1135 uint64_t vtbl; | |
1136 int32_t err; | |
1137 *is_interpreted = 0; | |
1138 | |
1139 result[0] = '\0'; | |
1140 | |
1141 err = find_start(J, pc, &start); | |
1142 CHECK_FAIL(err); | |
1143 | |
1144 err = read_pointer(J, start, &vtbl); | |
1145 CHECK_FAIL(err); | |
1146 | |
1147 if (vtbl == J->nmethod_vtbl) { | |
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1148 uint64_t method; |
4006 | 1149 |
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1150 err = read_pointer(J, start + OFFSET_nmethod_method, &method); |
4006 | 1151 CHECK_FAIL(err); |
1152 | |
1153 if (debug) { | |
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1154 fprintf(stderr, "name_for_codecache: start: %#8llx, pc: %#8llx, method: %#8llx \n", |
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1155 start, pc, method); |
4006 | 1156 } |
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1157 err = name_for_nmethod(J, start, pc, method, result, size, jframe); |
4006 | 1158 CHECK_FAIL(err); |
1159 } else if (vtbl == J->BufferBlob_vtbl) { | |
1160 const char * name; | |
1161 | |
1162 err = read_string_pointer(J, start + OFFSET_CodeBlob_name, &name); | |
1163 | |
1164 /* | |
1165 * Temporary usage of string "Interpreter". | |
1166 * We need some other way to distinguish "StubRoutines" | |
1167 * and regular interpreted frames. | |
1168 */ | |
1169 if (err == PS_OK && strncmp(name, "Interpreter", 11) == 0) { | |
1170 *is_interpreted = 1; | |
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1171 if (is_method(J, J->methodPtr)) { |
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1172 return name_for_imethod(J, J->bcx, J->methodPtr, result, size, jframe); |
4006 | 1173 } |
1174 } | |
1175 | |
1176 if (err == PS_OK) { | |
1177 strncpy(result, name, size); | |
1178 free((void*)name); | |
1179 } else { | |
1180 strncpy(result, "<unknown BufferBlob>", size); | |
1181 } | |
1182 /* return PS_OK; */ | |
1183 } else { | |
1184 const char * name; | |
1185 | |
1186 err = read_string_pointer(J, start + OFFSET_CodeBlob_name, &name); | |
1187 if (err == PS_OK) { | |
1188 strncpy(result, name, size); | |
1189 free((void*)name); | |
1190 } else { | |
1191 strncpy(result, "<unknown CodeBlob>", size); | |
1192 WARN1("unknown CodeBlob: vtbl = 0x%x", vtbl); | |
1193 } | |
1194 } | |
1195 result[size-1] = '\0'; | |
1196 | |
1197 #ifdef X86_COMPILER2 | |
1198 if (vtbl != J->RuntimeStub_vtbl) { | |
1199 uint64_t trial_pc; | |
1200 int frame_size; | |
1201 err = ps_pread(J->P, start + OFFSET_CodeBlob_frame_size, | |
1202 &frame_size, SZ32); | |
1203 CHECK_FAIL(err); | |
1204 | |
1205 // frame_size is in words, we want bytes. | |
1206 frame_size *= POINTER_SIZE; /* word => byte conversion */ | |
1207 | |
1208 /* | |
1209 Because c2 doesn't use FP as a framepointer the value of sp/fp we receive | |
1210 in the initial entry to a set of stack frames containing server frames | |
1211 will pretty much be nonsense. We can detect that nonsense by looking to | |
1212 see if the PC we received is correct if we look at the expected storage | |
1213 location in relation to the FP (ie. POINTER_SIZE(FP) ) | |
1214 */ | |
1215 | |
1216 err = read_pointer(J, fp + POINTER_SIZE , &trial_pc); | |
1217 if ( (err != PS_OK || trial_pc != pc) && frame_size > 0 ) { | |
1218 // Either we couldn't even read at the "fp" or the pc didn't match | |
1219 // both are sure clues that the fp is bogus. We no search the stack | |
1220 // for a reasonable number of words trying to find the bogus fp | |
1221 // and the current pc in adjacent words. The we will be able to | |
1222 // deduce an approximation of the frame pointer and actually get | |
1223 // the correct stack pointer. Which we can then unwind for the | |
1224 // next frame. | |
1225 int i; | |
1226 uint64_t check; | |
1227 uint64_t base = J->curr_fr.sp; | |
1228 uint64_t prev_fp = 0; | |
1229 for ( i = 0; i < frame_size * 5 ; i++, base += POINTER_SIZE ) { | |
1230 err = read_pointer(J, base , &check); | |
1231 CHECK_FAIL(err); | |
1232 if (check == fp) { | |
1233 base += POINTER_SIZE; | |
1234 err = read_pointer(J, base , &check); | |
1235 CHECK_FAIL(err); | |
1236 if (check == pc) { | |
1237 if (debug) { | |
1238 fprintf(stderr, "name_for_codecache: found matching fp/pc combo at 0x%llx\n", base - POINTER_SIZE); | |
1239 } | |
1240 prev_fp = base - 2 * POINTER_SIZE; | |
1241 break; | |
1242 } | |
1243 } | |
1244 } | |
1245 if ( prev_fp != 0 ) { | |
1246 // real_sp is the sp we should have received for this frame | |
1247 uint64_t real_sp = prev_fp + 2 * POINTER_SIZE; | |
1248 // +POINTER_SIZE because callee owns the return address so caller's sp is +1 word | |
1249 jframe->new_sp = real_sp + frame_size + POINTER_SIZE; | |
1250 err = read_pointer(J, jframe->new_sp - POINTER_SIZE , &jframe->new_pc); | |
1251 CHECK_FAIL(err); | |
1252 err = read_pointer(J, jframe->new_sp - 2*POINTER_SIZE, &jframe->new_fp); | |
1253 CHECK_FAIL(err); | |
1254 return PS_OK; | |
1255 } | |
1256 } | |
1257 | |
1258 /* A prototype to workaround FP absence */ | |
1259 /* | |
1260 * frame_size can be 0 for StubRoutines (1) frame. | |
1261 * In this case it should work with fp as usual. | |
1262 */ | |
1263 if (frame_size > 0) { | |
1264 jframe->new_fp = J->prev_fr.fp + frame_size; | |
1265 jframe->new_sp = jframe->new_fp + 2 * POINTER_SIZE; | |
1266 } else { | |
1267 memset(&J->curr_fr, 0, sizeof(Frame_t)); | |
1268 err = read_pointer(J, fp, &jframe->new_fp); | |
1269 CHECK_FAIL(err); | |
1270 | |
1271 err = read_pointer(J, jframe->new_fp + POINTER_SIZE, &jframe->new_pc); | |
1272 CHECK_FAIL(err); | |
1273 } | |
1274 if (debug) { | |
1275 fprintf(stderr, "name_for_codecache: %s, frame_size=%#lx\n", | |
1276 result, frame_size); | |
1277 fprintf(stderr, "name_for_codecache: prev_fr.fp=%#lx, fp=%#lx\n", | |
1278 J->prev_fr.fp, jframe->new_fp); | |
1279 } | |
1280 } | |
1281 #endif /* X86_COMPILER2 */ | |
1282 | |
1283 return PS_OK; | |
1284 | |
1285 fail: | |
1286 return err; | |
1287 } | |
1288 | |
1289 int Jget_vframe(jvm_agent_t* J, int vframe_no, | |
1290 char *name, size_t size, Jframe_t *jframe) | |
1291 { | |
1292 Nmethod_t *N = J->N; | |
1293 Vframe_t *vf; | |
1294 int32_t err; | |
1295 | |
1296 if (vframe_no >= N->vf_cnt) { | |
1297 (void) sprintf(name, "Wrong inlinedMethod%1d()", vframe_no); | |
1298 return -1; | |
1299 } | |
1300 vf = N->vframes + vframe_no; | |
1301 name[0] = COMP_METHOD_SIGN; | |
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1302 err = name_for_methodPtr(J, vf->method, name + 1, size); |
4006 | 1303 CHECK_FAIL(err); |
1304 | |
1305 jframe->bci = vf->bci; | |
1306 jframe->line = vf->line; | |
1307 if (debug) { | |
1308 fprintf(stderr, "\t Jget_vframe: method name: %s, line: %ld\n", | |
1309 name, vf->line); | |
1310 } | |
1311 return PS_OK; | |
1312 | |
1313 fail: | |
1314 if (debug) { | |
1315 fprintf(stderr, "\t Jget_vframe: FAIL\n"); | |
1316 } | |
1317 return err; | |
1318 } | |
1319 | |
1320 #define MAX_SYM_SIZE 256 | |
1321 | |
1322 int Jlookup_by_regs(jvm_agent_t* J, const prgregset_t regs, char *name, | |
1323 size_t size, Jframe_t *jframe) { | |
1324 uintptr_t fp; | |
1325 uintptr_t pc; | |
1326 /* arguments given to read_pointer need to be worst case sized */ | |
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1327 uint64_t methodPtr = 0; |
4006 | 1328 uint64_t sender_sp; |
1329 uint64_t bcx = 0; | |
1330 int is_interpreted = 0; | |
1331 int result = PS_OK; | |
1332 int err = PS_OK; | |
1333 | |
1334 if (J == NULL) { | |
1335 return -1; | |
1336 } | |
1337 | |
1338 jframe->vf_cnt = 1; | |
1339 jframe->new_fp = 0; | |
1340 jframe->new_pc = 0; | |
1341 jframe->line = 0; | |
1342 jframe->bci = 0; | |
1343 jframe->locinf = 0; | |
1344 | |
1345 read_volatiles(J); | |
1346 pc = (uintptr_t) regs[R_PC]; | |
1347 J->curr_fr.pc = pc; | |
1348 J->curr_fr.fp = regs[R_FP]; | |
1349 J->curr_fr.sp = regs[R_SP]; | |
1350 | |
1351 if (debug) | |
1352 fprintf(stderr, "Jlookup_by_regs: BEGINs: fp=%#lx, pc=%#lx\n", regs[R_FP], pc); | |
1353 | |
1354 #if defined(sparc) || defined(__sparc) | |
1355 /* The following workaround is for SPARC. CALL instruction occupates 8 bytes. | |
1356 * In the pcDesc structure return pc offset is recorded for CALL instructions. | |
1357 * regs[R_PC] contains a CALL instruction pc offset. | |
1358 */ | |
1359 pc += 8; | |
1360 bcx = (uintptr_t) regs[R_L1]; | |
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1361 methodPtr = (uintptr_t) regs[R_L2]; |
4006 | 1362 sender_sp = regs[R_I5]; |
1363 if (debug > 2) { | |
1364 fprintf(stderr, "\nregs[R_I1]=%lx, regs[R_I2]=%lx, regs[R_I5]=%lx, regs[R_L1]=%lx, regs[R_L2]=%lx\n", | |
1365 regs[R_I1], regs[R_I2], regs[R_I5], regs[R_L1], regs[R_L2]); | |
1366 } | |
1367 #elif defined(i386) || defined(__i386) || defined(__amd64) | |
1368 | |
1369 fp = (uintptr_t) regs[R_FP]; | |
1370 if (J->prev_fr.fp == 0) { | |
1371 #ifdef X86_COMPILER2 | |
1372 /* A workaround for top java frames */ | |
1373 J->prev_fr.fp = (uintptr_t)(regs[R_SP] - 2 * POINTER_SIZE); | |
1374 #else | |
1375 J->prev_fr.fp = (uintptr_t)(regs[R_SP] - POINTER_SIZE); | |
1376 #endif /* COMPILER2 */ | |
1377 } | |
1378 if (debug > 2) { | |
1379 printf("Jlookup_by_regs: J->prev_fr.fp = %#lx\n", J->prev_fr.fp); | |
1380 } | |
1381 | |
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1382 if (read_pointer(J, fp + OFFSET_interpreter_frame_method, &methodPtr) != PS_OK) { |
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1383 methodPtr = 0; |
4006 | 1384 } |
1385 if (read_pointer(J, fp + OFFSET_interpreter_frame_sender_sp, &sender_sp) != PS_OK) { | |
1386 sender_sp = 0; | |
1387 } | |
1388 if (read_pointer(J, fp + OFFSET_interpreter_frame_bcx_offset, &bcx) != PS_OK) { | |
1389 bcx = 0; | |
1390 } | |
1391 #endif /* i386 */ | |
1392 | |
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1393 J->methodPtr = methodPtr; |
4006 | 1394 J->bcx = bcx; |
1395 | |
1396 /* On x86 with C2 JVM: native frame may have wrong regs[R_FP] | |
1397 * For example: JVM_SuspendThread frame poins to the top interpreted frame. | |
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1398 * If we call is_method(J, methodPtr) before codecache_contains(J, pc) |
4006 | 1399 * then we go over and omit both: nmethod and I2CAdapter frames. |
1400 * Note, that regs[R_PC] is always correct if frame defined correctly. | |
1401 * So it is better to call codecache_contains(J, pc) from the beginning. | |
1402 */ | |
1403 #ifndef X86_COMPILER2 | |
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1404 if (is_method(J, J->methodPtr)) { |
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1405 result = name_for_imethod(J, bcx, J->methodPtr, name, size, jframe); |
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1406 /* If the methodPtr is a method then this is highly likely to be |
4006 | 1407 an interpreter frame */ |
1408 if (result >= 0) { | |
1409 is_interpreted = 1; | |
1410 } | |
1411 } else | |
1412 #endif /* ! X86_COMPILER2 */ | |
1413 | |
1414 if (codecache_contains(J, pc)) { | |
1415 result = name_for_codecache(J, fp, pc, name, size, jframe, &is_interpreted); | |
1416 } | |
1417 #ifdef X86_COMPILER2 | |
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1418 else if (is_method(J, J->methodPtr)) { |
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1419 result = name_for_imethod(J, bcx, J->methodPtr, name, size, jframe); |
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1420 /* If the methodPtr is a method then this is highly likely to be |
4006 | 1421 an interpreter frame */ |
1422 if (result >= 0) { | |
1423 is_interpreted = 1; | |
1424 } | |
1425 } | |
1426 #endif /* X86_COMPILER2 */ | |
1427 else { | |
1428 if (debug) { | |
1429 fprintf(stderr, "Jlookup_by_regs: END with -1\n\n"); | |
1430 } | |
1431 result = -1; | |
1432 } | |
1433 if (!is_interpreted) { | |
1434 sender_sp = 0; | |
1435 } | |
1436 J->curr_fr.sender_sp = sender_sp; | |
1437 | |
1438 #ifdef X86_COMPILER2 | |
1439 if (!J->curr_fr.fp) { | |
1440 J->curr_fr.fp = (jframe->new_fp) ? jframe->new_fp : (uintptr_t)regs[R_FP]; | |
1441 } | |
1442 if (!jframe->new_pc && jframe->new_fp) { | |
1443 // This seems dubious | |
1444 read_pointer(J, jframe->new_fp + POINTER_SIZE, &jframe->new_pc); | |
1445 CHECK_FAIL(err); | |
1446 if (debug > 2) { | |
1447 printf("Jlookup_by_regs: (update pc) jframe->new_fp: %#llx, jframe->new_pc: %#llx\n", | |
1448 jframe->new_fp, jframe->new_pc); | |
1449 } | |
1450 } | |
1451 | |
1452 #endif /* X86_COMPILER2 */ | |
1453 J->prev_fr = J->curr_fr; | |
1454 | |
1455 if (debug) | |
1456 fprintf(stderr, "Jlookup_by_regs: END\n\n"); | |
1457 | |
1458 return result; | |
1459 | |
1460 fail: | |
1461 return err; | |
1462 } | |
1463 | |
1464 void update_gregs(prgregset_t gregs, Jframe_t jframe) { | |
1465 #ifdef X86_COMPILER2 | |
1466 if (debug > 0) { | |
1467 fprintf(stderr, "update_gregs: before update sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); | |
1468 } | |
1469 /* | |
1470 * A workaround for java C2 frames with unconventional FP. | |
1471 * may have to modify regset with new values for FP/PC/SP when needed. | |
1472 */ | |
1473 if (jframe.new_sp) { | |
1474 *((uintptr_t *) &gregs[R_SP]) = (uintptr_t) jframe.new_sp; | |
1475 } else { | |
1476 // *((uintptr_t *) &gregs[R_SP]) = (uintptr_t) gregs[R_FP] + 2 * POINTER_SIZE; | |
1477 } | |
1478 | |
1479 if (jframe.new_fp) { | |
1480 *((uintptr_t *) &gregs[R_FP]) = (uintptr_t) jframe.new_fp; | |
1481 } | |
1482 if (jframe.new_pc) { | |
1483 *((uintptr_t *) &gregs[R_PC]) = (uintptr_t) jframe.new_pc; | |
1484 } | |
1485 if (debug > 0) { | |
1486 fprintf(stderr, "update_gregs: after update sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); | |
1487 } | |
1488 #endif /* X86_COMPILER2 */ | |
1489 } | |
1490 | |
1491 /* | |
1492 * Iterates over java frames at current location given by 'gregs'. | |
1493 * | |
1494 * Returns -1 if no java frames are present or if an error is encountered. | |
1495 * Returns the result of calling 'func' if the return value is non-zero. | |
1496 * Returns 0 otherwise. | |
1497 */ | |
1498 int Jframe_iter(jvm_agent_t *J, prgregset_t gregs, java_stack_f *func, void* cld) { | |
1499 char buf[MAX_SYM_SIZE + 1]; | |
1500 Jframe_t jframe; | |
1501 int i = 0, res; | |
1502 #ifdef X86_COMPILER2 | |
1503 if (debug > 0) { | |
1504 fprintf(stderr, "Jframe_iter: Entry sp = 0x%llx, fp = 0x%llx, pc = 0x%llx\n", gregs[R_SP], gregs[R_FP], gregs[R_PC]); | |
1505 } | |
1506 #endif /* X86_COMPILER2 */ | |
1507 | |
1508 memset(&jframe, 0, sizeof(Jframe_t)); | |
1509 memset(buf, 0, sizeof(buf)); | |
1510 res = Jlookup_by_regs(J, gregs, buf, sizeof(buf), &jframe); | |
1511 if (res != PS_OK) | |
1512 return (-1); | |
1513 | |
1514 | |
1515 res = func(cld, gregs, buf, (jframe.locinf)? jframe.bci : -1, | |
1516 jframe.line, NULL); | |
1517 if (res != 0) { | |
1518 update_gregs(gregs, jframe); | |
1519 return (res); | |
1520 } | |
1521 for (i = 1; i < jframe.vf_cnt; i++) { | |
1522 Jget_vframe(J, i, buf, sizeof(buf), &jframe); | |
1523 res = func(cld, gregs, buf, (jframe.locinf)? jframe.bci : -1, | |
1524 jframe.line, NULL); | |
1525 if (res != 0) { | |
1526 update_gregs(gregs, jframe); | |
1527 return (res); | |
1528 } | |
1529 } | |
1530 update_gregs(gregs, jframe); | |
1531 return (0); | |
1532 } |