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 extern "C" mirror::Object* artQuickGetProxyThisObject(StackReference<mirror::ArtMethod>* sp) 116 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 117 118 mirror::Object* StackVisitor::GetThisObject() const { 119 mirror::ArtMethod* m = GetMethod(); 120 if (m->IsStatic()) { 121 return NULL; 122 } else if (m->IsNative()) { 123 if (cur_quick_frame_ != NULL) { 124 HandleScope* hs = reinterpret_cast<HandleScope*>( 125 reinterpret_cast<char*>(cur_quick_frame_) + m->GetHandleScopeOffsetInBytes().SizeValue()); 126 return hs->GetReference(0); 127 } else { 128 return cur_shadow_frame_->GetVRegReference(0); 129 } 130 } else if (m->IsProxyMethod()) { 131 if (cur_quick_frame_ != nullptr) { 132 return artQuickGetProxyThisObject(cur_quick_frame_); 133 } else { 134 return cur_shadow_frame_->GetVRegReference(0); 135 } 136 } else { 137 const DexFile::CodeItem* code_item = m->GetCodeItem(); 138 if (code_item == NULL) { 139 UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method: " 140 << PrettyMethod(m); 141 return nullptr; 142 } else { 143 uint16_t reg = code_item->registers_size_ - code_item->ins_size_; 144 return reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kReferenceVReg)); 145 } 146 } 147 } 148 149 size_t StackVisitor::GetNativePcOffset() const { 150 DCHECK(!IsShadowFrame()); 151 return GetMethod()->NativePcOffset(cur_quick_frame_pc_); 152 } 153 154 bool StackVisitor::GetVReg(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind, 155 uint32_t* val) const { 156 if (cur_quick_frame_ != nullptr) { 157 DCHECK(context_ != nullptr); // You can't reliably read registers without a context. 158 DCHECK(m == GetMethod()); 159 const void* code_pointer = m->GetQuickOatCodePointer(sizeof(void*)); 160 DCHECK(code_pointer != nullptr); 161 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 162 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 163 uint32_t vmap_offset; 164 // TODO: IsInContext stops before spotting floating point registers. 165 if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { 166 bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); 167 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 168 uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); 169 uintptr_t ptr_val; 170 bool success = is_float ? GetFPR(reg, &ptr_val) : GetGPR(reg, &ptr_val); 171 if (!success) { 172 return false; 173 } 174 bool target64 = Is64BitInstructionSet(kRuntimeISA); 175 if (target64) { 176 bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); 177 bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); 178 int64_t value_long = static_cast<int64_t>(ptr_val); 179 if (wide_lo) { 180 ptr_val = static_cast<uintptr_t>(value_long & 0xFFFFFFFF); 181 } else if (wide_hi) { 182 ptr_val = static_cast<uintptr_t>(value_long >> 32); 183 } 184 } 185 *val = ptr_val; 186 return true; 187 } else { 188 const DexFile::CodeItem* code_item = m->GetCodeItem(); 189 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 190 // its instructions? 191 *val = *GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 192 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 193 return true; 194 } 195 } else { 196 *val = cur_shadow_frame_->GetVReg(vreg); 197 return true; 198 } 199 } 200 201 bool StackVisitor::GetVRegPair(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind_lo, 202 VRegKind kind_hi, uint64_t* val) const { 203 if (kind_lo == kLongLoVReg) { 204 DCHECK_EQ(kind_hi, kLongHiVReg); 205 } else if (kind_lo == kDoubleLoVReg) { 206 DCHECK_EQ(kind_hi, kDoubleHiVReg); 207 } else { 208 LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; 209 } 210 if (cur_quick_frame_ != nullptr) { 211 DCHECK(context_ != nullptr); // You can't reliably read registers without a context. 212 DCHECK(m == GetMethod()); 213 const void* code_pointer = m->GetQuickOatCodePointer(sizeof(void*)); 214 DCHECK(code_pointer != nullptr); 215 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 216 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 217 uint32_t vmap_offset_lo, vmap_offset_hi; 218 // TODO: IsInContext stops before spotting floating point registers. 219 if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && 220 vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { 221 bool is_float = (kind_lo == kDoubleLoVReg); 222 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 223 uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); 224 uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); 225 uintptr_t ptr_val_lo, ptr_val_hi; 226 bool success = is_float ? GetFPR(reg_lo, &ptr_val_lo) : GetGPR(reg_lo, &ptr_val_lo); 227 success &= is_float ? GetFPR(reg_hi, &ptr_val_hi) : GetGPR(reg_hi, &ptr_val_hi); 228 if (!success) { 229 return false; 230 } 231 bool target64 = Is64BitInstructionSet(kRuntimeISA); 232 if (target64) { 233 int64_t value_long_lo = static_cast<int64_t>(ptr_val_lo); 234 int64_t value_long_hi = static_cast<int64_t>(ptr_val_hi); 235 ptr_val_lo = static_cast<uintptr_t>(value_long_lo & 0xFFFFFFFF); 236 ptr_val_hi = static_cast<uintptr_t>(value_long_hi >> 32); 237 } 238 *val = (static_cast<uint64_t>(ptr_val_hi) << 32) | static_cast<uint32_t>(ptr_val_lo); 239 return true; 240 } else { 241 const DexFile::CodeItem* code_item = m->GetCodeItem(); 242 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 243 // its instructions? 244 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 245 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 246 *val = *reinterpret_cast<uint64_t*>(addr); 247 return true; 248 } 249 } else { 250 *val = cur_shadow_frame_->GetVRegLong(vreg); 251 return true; 252 } 253 } 254 255 bool StackVisitor::SetVReg(mirror::ArtMethod* m, uint16_t vreg, uint32_t new_value, 256 VRegKind kind) { 257 if (cur_quick_frame_ != nullptr) { 258 DCHECK(context_ != nullptr); // You can't reliably write registers without a context. 259 DCHECK(m == GetMethod()); 260 const void* code_pointer = m->GetQuickOatCodePointer(sizeof(void*)); 261 DCHECK(code_pointer != nullptr); 262 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 263 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 264 uint32_t vmap_offset; 265 // TODO: IsInContext stops before spotting floating point registers. 266 if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { 267 bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); 268 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 269 const uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); 270 bool target64 = Is64BitInstructionSet(kRuntimeISA); 271 // Deal with 32 or 64-bit wide registers in a way that builds on all targets. 272 if (target64) { 273 bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); 274 bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); 275 if (wide_lo || wide_hi) { 276 uintptr_t old_reg_val; 277 bool success = is_float ? GetFPR(reg, &old_reg_val) : GetGPR(reg, &old_reg_val); 278 if (!success) { 279 return false; 280 } 281 uint64_t new_vreg_portion = static_cast<uint64_t>(new_value); 282 uint64_t old_reg_val_as_wide = static_cast<uint64_t>(old_reg_val); 283 uint64_t mask = 0xffffffff; 284 if (wide_lo) { 285 mask = mask << 32; 286 } else { 287 new_vreg_portion = new_vreg_portion << 32; 288 } 289 new_value = static_cast<uintptr_t>((old_reg_val_as_wide & mask) | new_vreg_portion); 290 } 291 } 292 if (is_float) { 293 return SetFPR(reg, new_value); 294 } else { 295 return SetGPR(reg, new_value); 296 } 297 } else { 298 const DexFile::CodeItem* code_item = m->GetCodeItem(); 299 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 300 // its instructions? 301 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 302 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 303 *addr = new_value; 304 return true; 305 } 306 } else { 307 cur_shadow_frame_->SetVReg(vreg, new_value); 308 return true; 309 } 310 } 311 312 bool StackVisitor::SetVRegPair(mirror::ArtMethod* m, uint16_t vreg, uint64_t new_value, 313 VRegKind kind_lo, VRegKind kind_hi) { 314 if (kind_lo == kLongLoVReg) { 315 DCHECK_EQ(kind_hi, kLongHiVReg); 316 } else if (kind_lo == kDoubleLoVReg) { 317 DCHECK_EQ(kind_hi, kDoubleHiVReg); 318 } else { 319 LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; 320 } 321 if (cur_quick_frame_ != nullptr) { 322 DCHECK(context_ != nullptr); // You can't reliably write registers without a context. 323 DCHECK(m == GetMethod()); 324 const void* code_pointer = m->GetQuickOatCodePointer(sizeof(void*)); 325 DCHECK(code_pointer != nullptr); 326 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 327 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 328 uint32_t vmap_offset_lo, vmap_offset_hi; 329 // TODO: IsInContext stops before spotting floating point registers. 330 if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && 331 vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { 332 bool is_float = (kind_lo == kDoubleLoVReg); 333 uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); 334 uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); 335 uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); 336 uintptr_t new_value_lo = static_cast<uintptr_t>(new_value & 0xFFFFFFFF); 337 uintptr_t new_value_hi = static_cast<uintptr_t>(new_value >> 32); 338 bool target64 = Is64BitInstructionSet(kRuntimeISA); 339 // Deal with 32 or 64-bit wide registers in a way that builds on all targets. 340 if (target64) { 341 uintptr_t old_reg_val_lo, old_reg_val_hi; 342 bool success = is_float ? GetFPR(reg_lo, &old_reg_val_lo) : GetGPR(reg_lo, &old_reg_val_lo); 343 success &= is_float ? GetFPR(reg_hi, &old_reg_val_hi) : GetGPR(reg_hi, &old_reg_val_hi); 344 if (!success) { 345 return false; 346 } 347 uint64_t new_vreg_portion_lo = static_cast<uint64_t>(new_value_lo); 348 uint64_t new_vreg_portion_hi = static_cast<uint64_t>(new_value_hi) << 32; 349 uint64_t old_reg_val_lo_as_wide = static_cast<uint64_t>(old_reg_val_lo); 350 uint64_t old_reg_val_hi_as_wide = static_cast<uint64_t>(old_reg_val_hi); 351 uint64_t mask_lo = static_cast<uint64_t>(0xffffffff) << 32; 352 uint64_t mask_hi = 0xffffffff; 353 new_value_lo = static_cast<uintptr_t>((old_reg_val_lo_as_wide & mask_lo) | new_vreg_portion_lo); 354 new_value_hi = static_cast<uintptr_t>((old_reg_val_hi_as_wide & mask_hi) | new_vreg_portion_hi); 355 } 356 bool success = is_float ? SetFPR(reg_lo, new_value_lo) : SetGPR(reg_lo, new_value_lo); 357 success &= is_float ? SetFPR(reg_hi, new_value_hi) : SetGPR(reg_hi, new_value_hi); 358 return success; 359 } else { 360 const DexFile::CodeItem* code_item = m->GetCodeItem(); 361 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile 362 // its instructions? 363 uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), 364 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); 365 *reinterpret_cast<uint64_t*>(addr) = new_value; 366 return true; 367 } 368 } else { 369 cur_shadow_frame_->SetVRegLong(vreg, new_value); 370 return true; 371 } 372 } 373 374 uintptr_t* StackVisitor::GetGPRAddress(uint32_t reg) const { 375 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 376 return context_->GetGPRAddress(reg); 377 } 378 379 bool StackVisitor::GetGPR(uint32_t reg, uintptr_t* val) const { 380 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 381 return context_->GetGPR(reg, val); 382 } 383 384 bool StackVisitor::SetGPR(uint32_t reg, uintptr_t value) { 385 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 386 return context_->SetGPR(reg, value); 387 } 388 389 bool StackVisitor::GetFPR(uint32_t reg, uintptr_t* val) const { 390 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 391 return context_->GetFPR(reg, val); 392 } 393 394 bool StackVisitor::SetFPR(uint32_t reg, uintptr_t value) { 395 DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; 396 return context_->SetFPR(reg, value); 397 } 398 399 uintptr_t StackVisitor::GetReturnPc() const { 400 byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); 401 DCHECK(sp != NULL); 402 byte* pc_addr = sp + GetMethod()->GetReturnPcOffsetInBytes(); 403 return *reinterpret_cast<uintptr_t*>(pc_addr); 404 } 405 406 void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { 407 byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); 408 CHECK(sp != NULL); 409 byte* pc_addr = sp + GetMethod()->GetReturnPcOffsetInBytes(); 410 *reinterpret_cast<uintptr_t*>(pc_addr) = new_ret_pc; 411 } 412 413 size_t StackVisitor::ComputeNumFrames(Thread* thread) { 414 struct NumFramesVisitor : public StackVisitor { 415 explicit NumFramesVisitor(Thread* thread) 416 : StackVisitor(thread, NULL), frames(0) {} 417 418 bool VisitFrame() OVERRIDE { 419 frames++; 420 return true; 421 } 422 423 size_t frames; 424 }; 425 NumFramesVisitor visitor(thread); 426 visitor.WalkStack(true); 427 return visitor.frames; 428 } 429 430 bool StackVisitor::GetNextMethodAndDexPc(mirror::ArtMethod** next_method, uint32_t* next_dex_pc) { 431 struct HasMoreFramesVisitor : public StackVisitor { 432 explicit HasMoreFramesVisitor(Thread* thread, size_t num_frames, size_t frame_height) 433 : StackVisitor(thread, nullptr, num_frames), frame_height_(frame_height), 434 found_frame_(false), has_more_frames_(false), next_method_(nullptr), next_dex_pc_(0) { 435 } 436 437 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 438 if (found_frame_) { 439 mirror::ArtMethod* method = GetMethod(); 440 if (method != nullptr && !method->IsRuntimeMethod()) { 441 has_more_frames_ = true; 442 next_method_ = method; 443 next_dex_pc_ = GetDexPc(); 444 return false; // End stack walk once next method is found. 445 } 446 } else if (GetFrameHeight() == frame_height_) { 447 found_frame_ = true; 448 } 449 return true; 450 } 451 452 size_t frame_height_; 453 bool found_frame_; 454 bool has_more_frames_; 455 mirror::ArtMethod* next_method_; 456 uint32_t next_dex_pc_; 457 }; 458 HasMoreFramesVisitor visitor(thread_, GetNumFrames(), GetFrameHeight()); 459 visitor.WalkStack(true); 460 *next_method = visitor.next_method_; 461 *next_dex_pc = visitor.next_dex_pc_; 462 return visitor.has_more_frames_; 463 } 464 465 void StackVisitor::DescribeStack(Thread* thread) { 466 struct DescribeStackVisitor : public StackVisitor { 467 explicit DescribeStackVisitor(Thread* thread) 468 : StackVisitor(thread, NULL) {} 469 470 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 471 LOG(INFO) << "Frame Id=" << GetFrameId() << " " << DescribeLocation(); 472 return true; 473 } 474 }; 475 DescribeStackVisitor visitor(thread); 476 visitor.WalkStack(true); 477 } 478 479 std::string StackVisitor::DescribeLocation() const { 480 std::string result("Visiting method '"); 481 mirror::ArtMethod* m = GetMethod(); 482 if (m == NULL) { 483 return "upcall"; 484 } 485 result += PrettyMethod(m); 486 result += StringPrintf("' at dex PC 0x%04x", GetDexPc()); 487 if (!IsShadowFrame()) { 488 result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); 489 } 490 return result; 491 } 492 493 static instrumentation::InstrumentationStackFrame& GetInstrumentationStackFrame(Thread* thread, 494 uint32_t depth) { 495 CHECK_LT(depth, thread->GetInstrumentationStack()->size()); 496 return thread->GetInstrumentationStack()->at(depth); 497 } 498 499 void StackVisitor::SanityCheckFrame() const { 500 if (kIsDebugBuild) { 501 mirror::ArtMethod* method = GetMethod(); 502 CHECK_EQ(method->GetClass(), mirror::ArtMethod::GetJavaLangReflectArtMethod()); 503 if (cur_quick_frame_ != nullptr) { 504 method->AssertPcIsWithinQuickCode(cur_quick_frame_pc_); 505 // Frame sanity. 506 size_t frame_size = method->GetFrameSizeInBytes(); 507 CHECK_NE(frame_size, 0u); 508 // A rough guess at an upper size we expect to see for a frame. 509 // 256 registers 510 // 2 words HandleScope overhead 511 // 3+3 register spills 512 // TODO: this seems architecture specific for the case of JNI frames. 513 // TODO: 083-compiler-regressions ManyFloatArgs shows this estimate is wrong. 514 // const size_t kMaxExpectedFrameSize = (256 + 2 + 3 + 3) * sizeof(word); 515 const size_t kMaxExpectedFrameSize = 2 * KB; 516 CHECK_LE(frame_size, kMaxExpectedFrameSize); 517 size_t return_pc_offset = method->GetReturnPcOffsetInBytes(); 518 CHECK_LT(return_pc_offset, frame_size); 519 } 520 } 521 } 522 523 void StackVisitor::WalkStack(bool include_transitions) { 524 DCHECK(thread_ == Thread::Current() || thread_->IsSuspended()); 525 CHECK_EQ(cur_depth_, 0U); 526 bool exit_stubs_installed = Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled(); 527 uint32_t instrumentation_stack_depth = 0; 528 529 for (const ManagedStack* current_fragment = thread_->GetManagedStack(); current_fragment != NULL; 530 current_fragment = current_fragment->GetLink()) { 531 cur_shadow_frame_ = current_fragment->GetTopShadowFrame(); 532 cur_quick_frame_ = current_fragment->GetTopQuickFrame(); 533 cur_quick_frame_pc_ = current_fragment->GetTopQuickFramePc(); 534 535 if (cur_quick_frame_ != NULL) { // Handle quick stack frames. 536 // Can't be both a shadow and a quick fragment. 537 DCHECK(current_fragment->GetTopShadowFrame() == NULL); 538 mirror::ArtMethod* method = cur_quick_frame_->AsMirrorPtr(); 539 while (method != NULL) { 540 SanityCheckFrame(); 541 bool should_continue = VisitFrame(); 542 if (UNLIKELY(!should_continue)) { 543 return; 544 } 545 546 if (context_ != NULL) { 547 context_->FillCalleeSaves(*this); 548 } 549 size_t frame_size = method->GetFrameSizeInBytes(); 550 // Compute PC for next stack frame from return PC. 551 size_t return_pc_offset = method->GetReturnPcOffsetInBytes(frame_size); 552 byte* return_pc_addr = reinterpret_cast<byte*>(cur_quick_frame_) + return_pc_offset; 553 uintptr_t return_pc = *reinterpret_cast<uintptr_t*>(return_pc_addr); 554 if (UNLIKELY(exit_stubs_installed)) { 555 // While profiling, the return pc is restored from the side stack, except when walking 556 // the stack for an exception where the side stack will be unwound in VisitFrame. 557 if (GetQuickInstrumentationExitPc() == return_pc) { 558 const instrumentation::InstrumentationStackFrame& instrumentation_frame = 559 GetInstrumentationStackFrame(thread_, instrumentation_stack_depth); 560 instrumentation_stack_depth++; 561 if (GetMethod() == Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveAll)) { 562 // Skip runtime save all callee frames which are used to deliver exceptions. 563 } else if (instrumentation_frame.interpreter_entry_) { 564 mirror::ArtMethod* callee = Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); 565 CHECK_EQ(GetMethod(), callee) << "Expected: " << PrettyMethod(callee) << " Found: " 566 << PrettyMethod(GetMethod()); 567 } else if (instrumentation_frame.method_ != GetMethod()) { 568 LOG(FATAL) << "Expected: " << PrettyMethod(instrumentation_frame.method_) 569 << " Found: " << PrettyMethod(GetMethod()); 570 } 571 if (num_frames_ != 0) { 572 // Check agreement of frame Ids only if num_frames_ is computed to avoid infinite 573 // recursion. 574 CHECK(instrumentation_frame.frame_id_ == GetFrameId()) 575 << "Expected: " << instrumentation_frame.frame_id_ 576 << " Found: " << GetFrameId(); 577 } 578 return_pc = instrumentation_frame.return_pc_; 579 } 580 } 581 cur_quick_frame_pc_ = return_pc; 582 byte* next_frame = reinterpret_cast<byte*>(cur_quick_frame_) + frame_size; 583 cur_quick_frame_ = reinterpret_cast<StackReference<mirror::ArtMethod>*>(next_frame); 584 cur_depth_++; 585 method = cur_quick_frame_->AsMirrorPtr(); 586 } 587 } else if (cur_shadow_frame_ != NULL) { 588 do { 589 SanityCheckFrame(); 590 bool should_continue = VisitFrame(); 591 if (UNLIKELY(!should_continue)) { 592 return; 593 } 594 cur_depth_++; 595 cur_shadow_frame_ = cur_shadow_frame_->GetLink(); 596 } while (cur_shadow_frame_ != NULL); 597 } 598 if (include_transitions) { 599 bool should_continue = VisitFrame(); 600 if (!should_continue) { 601 return; 602 } 603 } 604 cur_depth_++; 605 } 606 if (num_frames_ != 0) { 607 CHECK_EQ(cur_depth_, num_frames_); 608 } 609 } 610 611 void JavaFrameRootInfo::Describe(std::ostream& os) const { 612 const StackVisitor* visitor = stack_visitor_; 613 CHECK(visitor != nullptr); 614 os << "Type=" << GetType() << " thread_id=" << GetThreadId() << " location=" << 615 visitor->DescribeLocation() << " vreg=" << vreg_; 616 } 617 618 } // namespace art 619
