1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "stack.h" 18 19 #include "arch/context.h" 20 #include "base/hex_dump.h" 21 #include "mirror/art_method-inl.h" 22 #include "mirror/class-inl.h" 23 #include "mirror/object.h" 24 #include "mirror/object-inl.h" 25 #include "mirror/object_array-inl.h" 26 #include "quick/quick_method_frame_info.h" 27 #include "runtime.h" 28 #include "thread.h" 29 #include "thread_list.h" 30 #include "throw_location.h" 31 #include "verify_object-inl.h" 32 #include "vmap_table.h" 33 34 namespace art { 35 36 mirror::Object* ShadowFrame::GetThisObject() const { 37 mirror::ArtMethod* m = GetMethod(); 38 if (m->IsStatic()) { 39 return NULL; 40 } else if (m->IsNative()) { 41 return GetVRegReference(0); 42 } else { 43 const DexFile::CodeItem* code_item = m->GetCodeItem(); 44 CHECK(code_item != NULL) << PrettyMethod(m); 45 uint16_t reg = code_item->registers_size_ - code_item->ins_size_; 46 return GetVRegReference(reg); 47 } 48 } 49 50 mirror::Object* ShadowFrame::GetThisObject(uint16_t num_ins) const { 51 mirror::ArtMethod* m = GetMethod(); 52 if (m->IsStatic()) { 53 return NULL; 54 } else { 55 return GetVRegReference(NumberOfVRegs() - num_ins); 56 } 57 } 58 59 ThrowLocation ShadowFrame::GetCurrentLocationForThrow() const { 60 return ThrowLocation(GetThisObject(), GetMethod(), GetDexPC()); 61 } 62 63 size_t ManagedStack::NumJniShadowFrameReferences() const { 64 size_t count = 0; 65 for (const ManagedStack* current_fragment = this; current_fragment != NULL; 66 current_fragment = current_fragment->GetLink()) { 67 for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != NULL; 68 current_frame = current_frame->GetLink()) { 69 if (current_frame->GetMethod()->IsNative()) { 70 // The JNI ShadowFrame only contains references. (For indirect reference.) 71 count += current_frame->NumberOfVRegs(); 72 } 73 } 74 } 75 return count; 76 } 77 78 bool ManagedStack::ShadowFramesContain(StackReference<mirror::Object>* shadow_frame_entry) const { 79 for (const ManagedStack* current_fragment = this; current_fragment != NULL; 80 current_fragment = current_fragment->GetLink()) { 81 for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != NULL; 82 current_frame = current_frame->GetLink()) { 83 if (current_frame->Contains(shadow_frame_entry)) { 84 return true; 85 } 86 } 87 } 88 return false; 89 } 90 91 StackVisitor::StackVisitor(Thread* thread, Context* context) 92 : thread_(thread), cur_shadow_frame_(NULL), 93 cur_quick_frame_(NULL), cur_quick_frame_pc_(0), num_frames_(0), cur_depth_(0), 94 context_(context) { 95 DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; 96 } 97 98 StackVisitor::StackVisitor(Thread* thread, Context* context, size_t num_frames) 99 : thread_(thread), cur_shadow_frame_(NULL), 100 cur_quick_frame_(NULL), cur_quick_frame_pc_(0), num_frames_(num_frames), cur_depth_(0), 101 context_(context) { 102 DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; 103 } 104 105 uint32_t StackVisitor::GetDexPc(bool abort_on_failure) const { 106 if (cur_shadow_frame_ != NULL) { 107 return cur_shadow_frame_->GetDexPC(); 108 } else if (cur_quick_frame_ != NULL) { 109 return GetMethod()->ToDexPc(cur_quick_frame_pc_, abort_on_failure); 110 } else { 111 return 0; 112 } 113 } 114 115 mirror::Object* StackVisitor::GetThisObject() const { 116 mirror::ArtMethod* m = GetMethod(); 117 if (m->IsStatic()) { 118 return NULL; 119 } else if (m->IsNative()) { 120 if (cur_quick_frame_ != NULL) { 121 HandleScope* hs = reinterpret_cast<HandleScope*>( 122 reinterpret_cast<char*>(cur_quick_frame_) + m->GetHandleScopeOffsetInBytes()); 123 return hs->GetReference(0); 124 } else { 125 return cur_shadow_frame_->GetVRegReference(0); 126 } 127 } else { 128 const DexFile::CodeItem* code_item = m->GetCodeItem(); 129 if (code_item == NULL) { 130 UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method: " 131 << PrettyMethod(m); 132 return nullptr; 133 } else { 134 uint16_t reg = code_item->registers_size_ - code_item->ins_size_; 135 return reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kReferenceVReg)); 136 } 137 } 138 } 139 140 size_t StackVisitor::GetNativePcOffset() const { 141 DCHECK(!IsShadowFrame()); 142 return GetMethod()->NativePcOffset(cur_quick_frame_pc_); 143 } 144 145 bool StackVisitor::GetVReg(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind, 146 uint32_t* val) const { 147 if (cur_quick_frame_ != nullptr) { 148 DCHECK(context_ != nullptr); // You can't reliably read registers without a context. 149 DCHECK(m == GetMethod()); 150 const void* code_pointer = m->GetQuickOatCodePointer(); 151 DCHECK(code_pointer != nullptr); 152 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 153 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 154 uint32_t vmap_offset; 155 // TODO: IsInContext stops before spotting floating point registers. 156 if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { 157 bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); 158 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 159 uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); 160 uintptr_t ptr_val; 161 bool success = is_float ? GetFPR(reg, &ptr_val) : GetGPR(reg, &ptr_val); 162 if (!success) { 163 return false; 164 } 165 bool target64 = Is64BitInstructionSet(kRuntimeISA); 166 if (target64) { 167 bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); 168 bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); 169 int64_t value_long = static_cast<int64_t>(ptr_val); 170 if (wide_lo) { 171 ptr_val = static_cast<uintptr_t>(value_long & 0xFFFFFFFF); 172 } else if (wide_hi) { 173 ptr_val = static_cast<uintptr_t>(value_long >> 32); 174 } 175 } 176 *val = ptr_val; 177 return true; 178 } else { 179 const DexFile::CodeItem* code_item = m->GetCodeItem(); 180 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 181 // its instructions? 182 *val = *GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 183 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 184 return true; 185 } 186 } else { 187 *val = cur_shadow_frame_->GetVReg(vreg); 188 return true; 189 } 190 } 191 192 bool StackVisitor::GetVRegPair(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind_lo, 193 VRegKind kind_hi, uint64_t* val) const { 194 if (kind_lo == kLongLoVReg) { 195 DCHECK_EQ(kind_hi, kLongHiVReg); 196 } else if (kind_lo == kDoubleLoVReg) { 197 DCHECK_EQ(kind_hi, kDoubleHiVReg); 198 } else { 199 LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; 200 } 201 if (cur_quick_frame_ != nullptr) { 202 DCHECK(context_ != nullptr); // You can't reliably read registers without a context. 203 DCHECK(m == GetMethod()); 204 const void* code_pointer = m->GetQuickOatCodePointer(); 205 DCHECK(code_pointer != nullptr); 206 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 207 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 208 uint32_t vmap_offset_lo, vmap_offset_hi; 209 // TODO: IsInContext stops before spotting floating point registers. 210 if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && 211 vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { 212 bool is_float = (kind_lo == kDoubleLoVReg); 213 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 214 uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); 215 uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); 216 uintptr_t ptr_val_lo, ptr_val_hi; 217 bool success = is_float ? GetFPR(reg_lo, &ptr_val_lo) : GetGPR(reg_lo, &ptr_val_lo); 218 success &= is_float ? GetFPR(reg_hi, &ptr_val_hi) : GetGPR(reg_hi, &ptr_val_hi); 219 if (!success) { 220 return false; 221 } 222 bool target64 = Is64BitInstructionSet(kRuntimeISA); 223 if (target64) { 224 int64_t value_long_lo = static_cast<int64_t>(ptr_val_lo); 225 int64_t value_long_hi = static_cast<int64_t>(ptr_val_hi); 226 ptr_val_lo = static_cast<uintptr_t>(value_long_lo & 0xFFFFFFFF); 227 ptr_val_hi = static_cast<uintptr_t>(value_long_hi >> 32); 228 } 229 *val = (static_cast<uint64_t>(ptr_val_hi) << 32) | static_cast<uint32_t>(ptr_val_lo); 230 return true; 231 } else { 232 const DexFile::CodeItem* code_item = m->GetCodeItem(); 233 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 234 // its instructions? 235 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 236 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 237 *val = *reinterpret_cast<uint64_t*>(addr); 238 return true; 239 } 240 } else { 241 *val = cur_shadow_frame_->GetVRegLong(vreg); 242 return true; 243 } 244 } 245 246 bool StackVisitor::SetVReg(mirror::ArtMethod* m, uint16_t vreg, uint32_t new_value, 247 VRegKind kind) { 248 if (cur_quick_frame_ != nullptr) { 249 DCHECK(context_ != nullptr); // You can't reliably write registers without a context. 250 DCHECK(m == GetMethod()); 251 const void* code_pointer = m->GetQuickOatCodePointer(); 252 DCHECK(code_pointer != nullptr); 253 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 254 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 255 uint32_t vmap_offset; 256 // TODO: IsInContext stops before spotting floating point registers. 257 if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { 258 bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); 259 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 260 const uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); 261 bool target64 = Is64BitInstructionSet(kRuntimeISA); 262 // Deal with 32 or 64-bit wide registers in a way that builds on all targets. 263 if (target64) { 264 bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); 265 bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); 266 if (wide_lo || wide_hi) { 267 uintptr_t old_reg_val; 268 bool success = is_float ? GetFPR(reg, &old_reg_val) : GetGPR(reg, &old_reg_val); 269 if (!success) { 270 return false; 271 } 272 uint64_t new_vreg_portion = static_cast<uint64_t>(new_value); 273 uint64_t old_reg_val_as_wide = static_cast<uint64_t>(old_reg_val); 274 uint64_t mask = 0xffffffff; 275 if (wide_lo) { 276 mask = mask << 32; 277 } else { 278 new_vreg_portion = new_vreg_portion << 32; 279 } 280 new_value = static_cast<uintptr_t>((old_reg_val_as_wide & mask) | new_vreg_portion); 281 } 282 } 283 if (is_float) { 284 return SetFPR(reg, new_value); 285 } else { 286 return SetGPR(reg, new_value); 287 } 288 } else { 289 const DexFile::CodeItem* code_item = m->GetCodeItem(); 290 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 291 // its instructions? 292 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 293 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 294 *addr = new_value; 295 return true; 296 } 297 } else { 298 cur_shadow_frame_->SetVReg(vreg, new_value); 299 return true; 300 } 301 } 302 303 bool StackVisitor::SetVRegPair(mirror::ArtMethod* m, uint16_t vreg, uint64_t new_value, 304 VRegKind kind_lo, VRegKind kind_hi) { 305 if (kind_lo == kLongLoVReg) { 306 DCHECK_EQ(kind_hi, kLongHiVReg); 307 } else if (kind_lo == kDoubleLoVReg) { 308 DCHECK_EQ(kind_hi, kDoubleHiVReg); 309 } else { 310 LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; 311 } 312 if (cur_quick_frame_ != nullptr) { 313 DCHECK(context_ != nullptr); // You can't reliably write registers without a context. 314 DCHECK(m == GetMethod()); 315 const void* code_pointer = m->GetQuickOatCodePointer(); 316 DCHECK(code_pointer != nullptr); 317 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 318 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 319 uint32_t vmap_offset_lo, vmap_offset_hi; 320 // TODO: IsInContext stops before spotting floating point registers. 321 if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && 322 vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { 323 bool is_float = (kind_lo == kDoubleLoVReg); 324 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 325 uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); 326 uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); 327 uintptr_t new_value_lo = static_cast<uintptr_t>(new_value & 0xFFFFFFFF); 328 uintptr_t new_value_hi = static_cast<uintptr_t>(new_value >> 32); 329 bool target64 = Is64BitInstructionSet(kRuntimeISA); 330 // Deal with 32 or 64-bit wide registers in a way that builds on all targets. 331 if (target64) { 332 uintptr_t old_reg_val_lo, old_reg_val_hi; 333 bool success = is_float ? GetFPR(reg_lo, &old_reg_val_lo) : GetGPR(reg_lo, &old_reg_val_lo); 334 success &= is_float ? GetFPR(reg_hi, &old_reg_val_hi) : GetGPR(reg_hi, &old_reg_val_hi); 335 if (!success) { 336 return false; 337 } 338 uint64_t new_vreg_portion_lo = static_cast<uint64_t>(new_value_lo); 339 uint64_t new_vreg_portion_hi = static_cast<uint64_t>(new_value_hi) << 32; 340 uint64_t old_reg_val_lo_as_wide = static_cast<uint64_t>(old_reg_val_lo); 341 uint64_t old_reg_val_hi_as_wide = static_cast<uint64_t>(old_reg_val_hi); 342 uint64_t mask_lo = static_cast<uint64_t>(0xffffffff) << 32; 343 uint64_t mask_hi = 0xffffffff; 344 new_value_lo = static_cast<uintptr_t>((old_reg_val_lo_as_wide & mask_lo) | new_vreg_portion_lo); 345 new_value_hi = static_cast<uintptr_t>((old_reg_val_hi_as_wide & mask_hi) | new_vreg_portion_hi); 346 } 347 bool success = is_float ? SetFPR(reg_lo, new_value_lo) : SetGPR(reg_lo, new_value_lo); 348 success &= is_float ? SetFPR(reg_hi, new_value_hi) : SetGPR(reg_hi, new_value_hi); 349 return success; 350 } else { 351 const DexFile::CodeItem* code_item = m->GetCodeItem(); 352 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 353 // its instructions? 354 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 355 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 356 *reinterpret_cast<uint64_t*>(addr) = new_value; 357 return true; 358 } 359 } else { 360 cur_shadow_frame_->SetVRegLong(vreg, new_value); 361 return true; 362 } 363 } 364 365 uintptr_t* StackVisitor::GetGPRAddress(uint32_t reg) const { 366 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 367 return context_->GetGPRAddress(reg); 368 } 369 370 bool StackVisitor::GetGPR(uint32_t reg, uintptr_t* val) const { 371 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 372 return context_->GetGPR(reg, val); 373 } 374 375 bool StackVisitor::SetGPR(uint32_t reg, uintptr_t value) { 376 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 377 return context_->SetGPR(reg, value); 378 } 379 380 bool StackVisitor::GetFPR(uint32_t reg, uintptr_t* val) const { 381 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 382 return context_->GetFPR(reg, val); 383 } 384 385 bool StackVisitor::SetFPR(uint32_t reg, uintptr_t value) { 386 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 387 return context_->SetFPR(reg, value); 388 } 389 390 uintptr_t StackVisitor::GetReturnPc() const { 391 byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); 392 DCHECK(sp != NULL); 393 byte* pc_addr = sp + GetMethod()->GetReturnPcOffsetInBytes(); 394 return *reinterpret_cast<uintptr_t*>(pc_addr); 395 } 396 397 void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { 398 byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); 399 CHECK(sp != NULL); 400 byte* pc_addr = sp + GetMethod()->GetReturnPcOffsetInBytes(); 401 *reinterpret_cast<uintptr_t*>(pc_addr) = new_ret_pc; 402 } 403 404 size_t StackVisitor::ComputeNumFrames(Thread* thread) { 405 struct NumFramesVisitor : public StackVisitor { 406 explicit NumFramesVisitor(Thread* thread) 407 : StackVisitor(thread, NULL), frames(0) {} 408 409 bool VisitFrame() OVERRIDE { 410 frames++; 411 return true; 412 } 413 414 size_t frames; 415 }; 416 NumFramesVisitor visitor(thread); 417 visitor.WalkStack(true); 418 return visitor.frames; 419 } 420 421 bool StackVisitor::GetNextMethodAndDexPc(mirror::ArtMethod** next_method, uint32_t* next_dex_pc) { 422 struct HasMoreFramesVisitor : public StackVisitor { 423 explicit HasMoreFramesVisitor(Thread* thread, size_t num_frames, size_t frame_height) 424 : StackVisitor(thread, nullptr, num_frames), frame_height_(frame_height), 425 found_frame_(false), has_more_frames_(false), next_method_(nullptr), next_dex_pc_(0) { 426 } 427 428 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 429 if (found_frame_) { 430 mirror::ArtMethod* method = GetMethod(); 431 if (method != nullptr && !method->IsRuntimeMethod()) { 432 has_more_frames_ = true; 433 next_method_ = method; 434 next_dex_pc_ = GetDexPc(); 435 return false; // End stack walk once next method is found. 436 } 437 } else if (GetFrameHeight() == frame_height_) { 438 found_frame_ = true; 439 } 440 return true; 441 } 442 443 size_t frame_height_; 444 bool found_frame_; 445 bool has_more_frames_; 446 mirror::ArtMethod* next_method_; 447 uint32_t next_dex_pc_; 448 }; 449 HasMoreFramesVisitor visitor(thread_, GetNumFrames(), GetFrameHeight()); 450 visitor.WalkStack(true); 451 *next_method = visitor.next_method_; 452 *next_dex_pc = visitor.next_dex_pc_; 453 return visitor.has_more_frames_; 454 } 455 456 void StackVisitor::DescribeStack(Thread* thread) { 457 struct DescribeStackVisitor : public StackVisitor { 458 explicit DescribeStackVisitor(Thread* thread) 459 : StackVisitor(thread, NULL) {} 460 461 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 462 LOG(INFO) << "Frame Id=" << GetFrameId() << " " << DescribeLocation(); 463 return true; 464 } 465 }; 466 DescribeStackVisitor visitor(thread); 467 visitor.WalkStack(true); 468 } 469 470 std::string StackVisitor::DescribeLocation() const { 471 std::string result("Visiting method '"); 472 mirror::ArtMethod* m = GetMethod(); 473 if (m == NULL) { 474 return "upcall"; 475 } 476 result += PrettyMethod(m); 477 result += StringPrintf("' at dex PC 0x%04x", GetDexPc()); 478 if (!IsShadowFrame()) { 479 result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); 480 } 481 return result; 482 } 483 484 static instrumentation::InstrumentationStackFrame& GetInstrumentationStackFrame(Thread* thread, 485 uint32_t depth) { 486 CHECK_LT(depth, thread->GetInstrumentationStack()->size()); 487 return thread->GetInstrumentationStack()->at(depth); 488 } 489 490 void StackVisitor::SanityCheckFrame() const { 491 if (kIsDebugBuild) { 492 mirror::ArtMethod* method = GetMethod(); 493 CHECK_EQ(method->GetClass(), mirror::ArtMethod::GetJavaLangReflectArtMethod()); 494 if (cur_quick_frame_ != nullptr) { 495 method->AssertPcIsWithinQuickCode(cur_quick_frame_pc_); 496 // Frame sanity. 497 size_t frame_size = method->GetFrameSizeInBytes(); 498 CHECK_NE(frame_size, 0u); 499 // A rough guess at an upper size we expect to see for a frame. 500 // 256 registers 501 // 2 words HandleScope overhead 502 // 3+3 register spills 503 // TODO: this seems architecture specific for the case of JNI frames. 504 // TODO: 083-compiler-regressions ManyFloatArgs shows this estimate is wrong. 505 // const size_t kMaxExpectedFrameSize = (256 + 2 + 3 + 3) * sizeof(word); 506 const size_t kMaxExpectedFrameSize = 2 * KB; 507 CHECK_LE(frame_size, kMaxExpectedFrameSize); 508 size_t return_pc_offset = method->GetReturnPcOffsetInBytes(); 509 CHECK_LT(return_pc_offset, frame_size); 510 } 511 } 512 } 513 514 void StackVisitor::WalkStack(bool include_transitions) { 515 DCHECK(thread_ == Thread::Current() || thread_->IsSuspended()); 516 CHECK_EQ(cur_depth_, 0U); 517 bool exit_stubs_installed = Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled(); 518 uint32_t instrumentation_stack_depth = 0; 519 520 for (const ManagedStack* current_fragment = thread_->GetManagedStack(); current_fragment != NULL; 521 current_fragment = current_fragment->GetLink()) { 522 cur_shadow_frame_ = current_fragment->GetTopShadowFrame(); 523 cur_quick_frame_ = current_fragment->GetTopQuickFrame(); 524 cur_quick_frame_pc_ = current_fragment->GetTopQuickFramePc(); 525 526 if (cur_quick_frame_ != NULL) { // Handle quick stack frames. 527 // Can't be both a shadow and a quick fragment. 528 DCHECK(current_fragment->GetTopShadowFrame() == NULL); 529 mirror::ArtMethod* method = cur_quick_frame_->AsMirrorPtr(); 530 while (method != NULL) { 531 SanityCheckFrame(); 532 bool should_continue = VisitFrame(); 533 if (UNLIKELY(!should_continue)) { 534 return; 535 } 536 537 if (context_ != NULL) { 538 context_->FillCalleeSaves(*this); 539 } 540 size_t frame_size = method->GetFrameSizeInBytes(); 541 // Compute PC for next stack frame from return PC. 542 size_t return_pc_offset = method->GetReturnPcOffsetInBytes(frame_size); 543 byte* return_pc_addr = reinterpret_cast<byte*>(cur_quick_frame_) + return_pc_offset; 544 uintptr_t return_pc = *reinterpret_cast<uintptr_t*>(return_pc_addr); 545 if (UNLIKELY(exit_stubs_installed)) { 546 // While profiling, the return pc is restored from the side stack, except when walking 547 // the stack for an exception where the side stack will be unwound in VisitFrame. 548 if (GetQuickInstrumentationExitPc() == return_pc) { 549 const instrumentation::InstrumentationStackFrame& instrumentation_frame = 550 GetInstrumentationStackFrame(thread_, instrumentation_stack_depth); 551 instrumentation_stack_depth++; 552 if (GetMethod() == Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveAll)) { 553 // Skip runtime save all callee frames which are used to deliver exceptions. 554 } else if (instrumentation_frame.interpreter_entry_) { 555 mirror::ArtMethod* callee = Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 556 CHECK_EQ(GetMethod(), callee) << "Expected: " << PrettyMethod(callee) << " Found: " 557 << PrettyMethod(GetMethod()); 558 } else if (instrumentation_frame.method_ != GetMethod()) { 559 LOG(FATAL) << "Expected: " << PrettyMethod(instrumentation_frame.method_) 560 << " Found: " << PrettyMethod(GetMethod()); 561 } 562 if (num_frames_ != 0) { 563 // Check agreement of frame Ids only if num_frames_ is computed to avoid infinite 564 // recursion. 565 CHECK(instrumentation_frame.frame_id_ == GetFrameId()) 566 << "Expected: " << instrumentation_frame.frame_id_ 567 << " Found: " << GetFrameId(); 568 } 569 return_pc = instrumentation_frame.return_pc_; 570 } 571 } 572 cur_quick_frame_pc_ = return_pc; 573 byte* next_frame = reinterpret_cast<byte*>(cur_quick_frame_) + frame_size; 574 cur_quick_frame_ = reinterpret_cast<StackReference<mirror::ArtMethod>*>(next_frame); 575 cur_depth_++; 576 method = cur_quick_frame_->AsMirrorPtr(); 577 } 578 } else if (cur_shadow_frame_ != NULL) { 579 do { 580 SanityCheckFrame(); 581 bool should_continue = VisitFrame(); 582 if (UNLIKELY(!should_continue)) { 583 return; 584 } 585 cur_depth_++; 586 cur_shadow_frame_ = cur_shadow_frame_->GetLink(); 587 } while (cur_shadow_frame_ != NULL); 588 } 589 if (include_transitions) { 590 bool should_continue = VisitFrame(); 591 if (!should_continue) { 592 return; 593 } 594 } 595 cur_depth_++; 596 } 597 if (num_frames_ != 0) { 598 CHECK_EQ(cur_depth_, num_frames_); 599 } 600 } 601 602 } // namespace art 603
