| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "stack.h" |
| |
| #include "arch/context.h" |
| #include "art_method-inl.h" |
| #include "base/hex_dump.h" |
| #include "entrypoints/entrypoint_utils-inl.h" |
| #include "entrypoints/runtime_asm_entrypoints.h" |
| #include "gc_map.h" |
| #include "gc/space/image_space.h" |
| #include "gc/space/space-inl.h" |
| #include "jit/jit.h" |
| #include "jit/jit_code_cache.h" |
| #include "linear_alloc.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "oat_quick_method_header.h" |
| #include "quick/quick_method_frame_info.h" |
| #include "runtime.h" |
| #include "thread.h" |
| #include "thread_list.h" |
| #include "verify_object-inl.h" |
| #include "vmap_table.h" |
| |
| namespace art { |
| |
| static constexpr bool kDebugStackWalk = false; |
| |
| mirror::Object* ShadowFrame::GetThisObject() const { |
| ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return nullptr; |
| } else if (m->IsNative()) { |
| return GetVRegReference(0); |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| CHECK(code_item != nullptr) << PrettyMethod(m); |
| uint16_t reg = code_item->registers_size_ - code_item->ins_size_; |
| return GetVRegReference(reg); |
| } |
| } |
| |
| mirror::Object* ShadowFrame::GetThisObject(uint16_t num_ins) const { |
| ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return nullptr; |
| } else { |
| return GetVRegReference(NumberOfVRegs() - num_ins); |
| } |
| } |
| |
| size_t ManagedStack::NumJniShadowFrameReferences() const { |
| size_t count = 0; |
| for (const ManagedStack* current_fragment = this; current_fragment != nullptr; |
| current_fragment = current_fragment->GetLink()) { |
| for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != nullptr; |
| current_frame = current_frame->GetLink()) { |
| if (current_frame->GetMethod()->IsNative()) { |
| // The JNI ShadowFrame only contains references. (For indirect reference.) |
| count += current_frame->NumberOfVRegs(); |
| } |
| } |
| } |
| return count; |
| } |
| |
| bool ManagedStack::ShadowFramesContain(StackReference<mirror::Object>* shadow_frame_entry) const { |
| for (const ManagedStack* current_fragment = this; current_fragment != nullptr; |
| current_fragment = current_fragment->GetLink()) { |
| for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != nullptr; |
| current_frame = current_frame->GetLink()) { |
| if (current_frame->Contains(shadow_frame_entry)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| StackVisitor::StackVisitor(Thread* thread, Context* context, StackWalkKind walk_kind) |
| : StackVisitor(thread, context, walk_kind, 0) {} |
| |
| StackVisitor::StackVisitor(Thread* thread, |
| Context* context, |
| StackWalkKind walk_kind, |
| size_t num_frames) |
| : thread_(thread), |
| walk_kind_(walk_kind), |
| cur_shadow_frame_(nullptr), |
| cur_quick_frame_(nullptr), |
| cur_quick_frame_pc_(0), |
| cur_oat_quick_method_header_(nullptr), |
| num_frames_(num_frames), |
| cur_depth_(0), |
| current_inlining_depth_(0), |
| context_(context) { |
| DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; |
| } |
| |
| InlineInfo StackVisitor::GetCurrentInlineInfo() const { |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| uint32_t native_pc_offset = method_header->NativeQuickPcOffset(cur_quick_frame_pc_); |
| CodeInfo code_info = method_header->GetOptimizedCodeInfo(); |
| StackMapEncoding encoding = code_info.ExtractEncoding(); |
| StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); |
| DCHECK(stack_map.IsValid()); |
| return code_info.GetInlineInfoOf(stack_map, encoding); |
| } |
| |
| ArtMethod* StackVisitor::GetMethod() const { |
| if (cur_shadow_frame_ != nullptr) { |
| return cur_shadow_frame_->GetMethod(); |
| } else if (cur_quick_frame_ != nullptr) { |
| if (IsInInlinedFrame()) { |
| size_t depth_in_stack_map = current_inlining_depth_ - 1; |
| InlineInfo inline_info = GetCurrentInlineInfo(); |
| return GetResolvedMethod(*GetCurrentQuickFrame(), inline_info, depth_in_stack_map); |
| } else { |
| return *cur_quick_frame_; |
| } |
| } |
| return nullptr; |
| } |
| |
| uint32_t StackVisitor::GetDexPc(bool abort_on_failure) const { |
| if (cur_shadow_frame_ != nullptr) { |
| return cur_shadow_frame_->GetDexPC(); |
| } else if (cur_quick_frame_ != nullptr) { |
| if (IsInInlinedFrame()) { |
| size_t depth_in_stack_map = current_inlining_depth_ - 1; |
| return GetCurrentInlineInfo().GetDexPcAtDepth(depth_in_stack_map); |
| } else if (cur_oat_quick_method_header_ == nullptr) { |
| return DexFile::kDexNoIndex; |
| } else { |
| return cur_oat_quick_method_header_->ToDexPc( |
| GetMethod(), cur_quick_frame_pc_, abort_on_failure); |
| } |
| } else { |
| return 0; |
| } |
| } |
| |
| extern "C" mirror::Object* artQuickGetProxyThisObject(ArtMethod** sp) |
| SHARED_REQUIRES(Locks::mutator_lock_); |
| |
| mirror::Object* StackVisitor::GetThisObject() const { |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), sizeof(void*)); |
| ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return nullptr; |
| } else if (m->IsNative()) { |
| if (cur_quick_frame_ != nullptr) { |
| HandleScope* hs = reinterpret_cast<HandleScope*>( |
| reinterpret_cast<char*>(cur_quick_frame_) + sizeof(ArtMethod*)); |
| return hs->GetReference(0); |
| } else { |
| return cur_shadow_frame_->GetVRegReference(0); |
| } |
| } else if (m->IsProxyMethod()) { |
| if (cur_quick_frame_ != nullptr) { |
| return artQuickGetProxyThisObject(cur_quick_frame_); |
| } else { |
| return cur_shadow_frame_->GetVRegReference(0); |
| } |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| if (code_item == nullptr) { |
| UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method: " |
| << PrettyMethod(m); |
| return nullptr; |
| } else { |
| uint16_t reg = code_item->registers_size_ - code_item->ins_size_; |
| uint32_t value = 0; |
| bool success = GetVReg(m, reg, kReferenceVReg, &value); |
| // We currently always guarantee the `this` object is live throughout the method. |
| CHECK(success) << "Failed to read the this object in " << PrettyMethod(m); |
| return reinterpret_cast<mirror::Object*>(value); |
| } |
| } |
| } |
| |
| size_t StackVisitor::GetNativePcOffset() const { |
| DCHECK(!IsShadowFrame()); |
| return GetCurrentOatQuickMethodHeader()->NativeQuickPcOffset(cur_quick_frame_pc_); |
| } |
| |
| bool StackVisitor::IsReferenceVReg(ArtMethod* m, uint16_t vreg) { |
| DCHECK_EQ(m, GetMethod()); |
| // Process register map (which native and runtime methods don't have) |
| if (m->IsNative() || m->IsRuntimeMethod() || m->IsProxyMethod()) { |
| return false; |
| } |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| if (method_header->IsOptimized()) { |
| return true; // TODO: Implement. |
| } |
| const uint8_t* native_gc_map = method_header->GetNativeGcMap(); |
| CHECK(native_gc_map != nullptr) << PrettyMethod(m); |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| // Can't be null or how would we compile its instructions? |
| DCHECK(code_item != nullptr) << PrettyMethod(m); |
| NativePcOffsetToReferenceMap map(native_gc_map); |
| size_t num_regs = std::min(map.RegWidth() * 8, static_cast<size_t>(code_item->registers_size_)); |
| const uint8_t* reg_bitmap = nullptr; |
| if (num_regs > 0) { |
| uintptr_t native_pc_offset = method_header->NativeQuickPcOffset(GetCurrentQuickFramePc()); |
| reg_bitmap = map.FindBitMap(native_pc_offset); |
| DCHECK(reg_bitmap != nullptr); |
| } |
| // Does this register hold a reference? |
| return vreg < num_regs && TestBitmap(vreg, reg_bitmap); |
| } |
| |
| bool StackVisitor::GetVRegFromDebuggerShadowFrame(uint16_t vreg, |
| VRegKind kind, |
| uint32_t* val) const { |
| size_t frame_id = const_cast<StackVisitor*>(this)->GetFrameId(); |
| ShadowFrame* shadow_frame = thread_->FindDebuggerShadowFrame(frame_id); |
| if (shadow_frame != nullptr) { |
| bool* updated_vreg_flags = thread_->GetUpdatedVRegFlags(frame_id); |
| DCHECK(updated_vreg_flags != nullptr); |
| if (updated_vreg_flags[vreg]) { |
| // Value is set by the debugger. |
| if (kind == kReferenceVReg) { |
| *val = static_cast<uint32_t>(reinterpret_cast<uintptr_t>( |
| shadow_frame->GetVRegReference(vreg))); |
| } else { |
| *val = shadow_frame->GetVReg(vreg); |
| } |
| return true; |
| } |
| } |
| // No value is set by the debugger. |
| return false; |
| } |
| |
| bool StackVisitor::GetVReg(ArtMethod* m, uint16_t vreg, VRegKind kind, uint32_t* val) const { |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| // Check if there is value set by the debugger. |
| if (GetVRegFromDebuggerShadowFrame(vreg, kind, val)) { |
| return true; |
| } |
| if (cur_oat_quick_method_header_->IsOptimized()) { |
| return GetVRegFromOptimizedCode(m, vreg, kind, val); |
| } else { |
| return GetVRegFromQuickCode(m, vreg, kind, val); |
| } |
| } else { |
| DCHECK(cur_shadow_frame_ != nullptr); |
| if (kind == kReferenceVReg) { |
| *val = static_cast<uint32_t>(reinterpret_cast<uintptr_t>( |
| cur_shadow_frame_->GetVRegReference(vreg))); |
| } else { |
| *val = cur_shadow_frame_->GetVReg(vreg); |
| } |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegFromQuickCode(ArtMethod* m, uint16_t vreg, VRegKind kind, |
| uint32_t* val) const { |
| DCHECK_EQ(m, GetMethod()); |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| QuickMethodFrameInfo frame_info = method_header->GetFrameInfo(); |
| const VmapTable vmap_table(method_header->GetVmapTable()); |
| uint32_t vmap_offset; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { |
| bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); |
| return GetRegisterIfAccessible(reg, kind, val); |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be null or how would we compile |
| // its instructions? |
| *val = *GetVRegAddrFromQuickCode(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegFromOptimizedCode(ArtMethod* m, uint16_t vreg, VRegKind kind, |
| uint32_t* val) const { |
| DCHECK_EQ(m, GetMethod()); |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be null or how would we compile |
| // its instructions? |
| uint16_t number_of_dex_registers = code_item->registers_size_; |
| DCHECK_LT(vreg, code_item->registers_size_); |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| CodeInfo code_info = method_header->GetOptimizedCodeInfo(); |
| StackMapEncoding encoding = code_info.ExtractEncoding(); |
| |
| uint32_t native_pc_offset = method_header->NativeQuickPcOffset(cur_quick_frame_pc_); |
| StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); |
| DCHECK(stack_map.IsValid()); |
| size_t depth_in_stack_map = current_inlining_depth_ - 1; |
| |
| DexRegisterMap dex_register_map = IsInInlinedFrame() |
| ? code_info.GetDexRegisterMapAtDepth(depth_in_stack_map, |
| code_info.GetInlineInfoOf(stack_map, encoding), |
| encoding, |
| number_of_dex_registers) |
| : code_info.GetDexRegisterMapOf(stack_map, encoding, number_of_dex_registers); |
| |
| if (!dex_register_map.IsValid()) { |
| return false; |
| } |
| DexRegisterLocation::Kind location_kind = |
| dex_register_map.GetLocationKind(vreg, number_of_dex_registers, code_info, encoding); |
| switch (location_kind) { |
| case DexRegisterLocation::Kind::kInStack: { |
| const int32_t offset = dex_register_map.GetStackOffsetInBytes(vreg, |
| number_of_dex_registers, |
| code_info, |
| encoding); |
| const uint8_t* addr = reinterpret_cast<const uint8_t*>(cur_quick_frame_) + offset; |
| *val = *reinterpret_cast<const uint32_t*>(addr); |
| return true; |
| } |
| case DexRegisterLocation::Kind::kInRegister: |
| case DexRegisterLocation::Kind::kInRegisterHigh: |
| case DexRegisterLocation::Kind::kInFpuRegister: |
| case DexRegisterLocation::Kind::kInFpuRegisterHigh: { |
| uint32_t reg = |
| dex_register_map.GetMachineRegister(vreg, number_of_dex_registers, code_info, encoding); |
| return GetRegisterIfAccessible(reg, kind, val); |
| } |
| case DexRegisterLocation::Kind::kConstant: |
| *val = dex_register_map.GetConstant(vreg, number_of_dex_registers, code_info, encoding); |
| return true; |
| case DexRegisterLocation::Kind::kNone: |
| return false; |
| default: |
| LOG(FATAL) |
| << "Unexpected location kind" |
| << DexRegisterLocation::PrettyDescriptor( |
| dex_register_map.GetLocationInternalKind(vreg, |
| number_of_dex_registers, |
| code_info, |
| encoding)); |
| UNREACHABLE(); |
| } |
| } |
| |
| bool StackVisitor::GetRegisterIfAccessible(uint32_t reg, VRegKind kind, uint32_t* val) const { |
| const bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); |
| |
| // X86 float registers are 64-bit and the logic below does not apply. |
| DCHECK(!is_float || kRuntimeISA != InstructionSet::kX86); |
| |
| if (!IsAccessibleRegister(reg, is_float)) { |
| return false; |
| } |
| uintptr_t ptr_val = GetRegister(reg, is_float); |
| const bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| if (target64) { |
| const bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); |
| const bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); |
| int64_t value_long = static_cast<int64_t>(ptr_val); |
| if (wide_lo) { |
| ptr_val = static_cast<uintptr_t>(Low32Bits(value_long)); |
| } else if (wide_hi) { |
| ptr_val = static_cast<uintptr_t>(High32Bits(value_long)); |
| } |
| } |
| *val = ptr_val; |
| return true; |
| } |
| |
| bool StackVisitor::GetVRegPairFromDebuggerShadowFrame(uint16_t vreg, |
| VRegKind kind_lo, |
| VRegKind kind_hi, |
| uint64_t* val) const { |
| uint32_t low_32bits; |
| uint32_t high_32bits; |
| bool success = GetVRegFromDebuggerShadowFrame(vreg, kind_lo, &low_32bits); |
| success &= GetVRegFromDebuggerShadowFrame(vreg + 1, kind_hi, &high_32bits); |
| if (success) { |
| *val = (static_cast<uint64_t>(high_32bits) << 32) | static_cast<uint64_t>(low_32bits); |
| } |
| return success; |
| } |
| |
| bool StackVisitor::GetVRegPair(ArtMethod* m, uint16_t vreg, VRegKind kind_lo, |
| VRegKind kind_hi, uint64_t* val) const { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| UNREACHABLE(); |
| } |
| // Check if there is value set by the debugger. |
| if (GetVRegPairFromDebuggerShadowFrame(vreg, kind_lo, kind_hi, val)) { |
| return true; |
| } |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| if (cur_oat_quick_method_header_->IsOptimized()) { |
| return GetVRegPairFromOptimizedCode(m, vreg, kind_lo, kind_hi, val); |
| } else { |
| return GetVRegPairFromQuickCode(m, vreg, kind_lo, kind_hi, val); |
| } |
| } else { |
| DCHECK(cur_shadow_frame_ != nullptr); |
| *val = cur_shadow_frame_->GetVRegLong(vreg); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegPairFromQuickCode(ArtMethod* m, uint16_t vreg, VRegKind kind_lo, |
| VRegKind kind_hi, uint64_t* val) const { |
| DCHECK_EQ(m, GetMethod()); |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| QuickMethodFrameInfo frame_info = method_header->GetFrameInfo(); |
| const VmapTable vmap_table(method_header->GetVmapTable()); |
| uint32_t vmap_offset_lo, vmap_offset_hi; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && |
| vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { |
| bool is_float = (kind_lo == kDoubleLoVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); |
| uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); |
| return GetRegisterPairIfAccessible(reg_lo, reg_hi, kind_lo, val); |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be null or how would we compile |
| // its instructions? |
| uint32_t* addr = GetVRegAddrFromQuickCode( |
| cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| *val = *reinterpret_cast<uint64_t*>(addr); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegPairFromOptimizedCode(ArtMethod* m, uint16_t vreg, |
| VRegKind kind_lo, VRegKind kind_hi, |
| uint64_t* val) const { |
| uint32_t low_32bits; |
| uint32_t high_32bits; |
| bool success = GetVRegFromOptimizedCode(m, vreg, kind_lo, &low_32bits); |
| success &= GetVRegFromOptimizedCode(m, vreg + 1, kind_hi, &high_32bits); |
| if (success) { |
| *val = (static_cast<uint64_t>(high_32bits) << 32) | static_cast<uint64_t>(low_32bits); |
| } |
| return success; |
| } |
| |
| bool StackVisitor::GetRegisterPairIfAccessible(uint32_t reg_lo, uint32_t reg_hi, |
| VRegKind kind_lo, uint64_t* val) const { |
| const bool is_float = (kind_lo == kDoubleLoVReg); |
| if (!IsAccessibleRegister(reg_lo, is_float) || !IsAccessibleRegister(reg_hi, is_float)) { |
| return false; |
| } |
| uintptr_t ptr_val_lo = GetRegister(reg_lo, is_float); |
| uintptr_t ptr_val_hi = GetRegister(reg_hi, is_float); |
| bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| if (target64) { |
| int64_t value_long_lo = static_cast<int64_t>(ptr_val_lo); |
| int64_t value_long_hi = static_cast<int64_t>(ptr_val_hi); |
| ptr_val_lo = static_cast<uintptr_t>(Low32Bits(value_long_lo)); |
| ptr_val_hi = static_cast<uintptr_t>(High32Bits(value_long_hi)); |
| } |
| *val = (static_cast<uint64_t>(ptr_val_hi) << 32) | static_cast<uint32_t>(ptr_val_lo); |
| return true; |
| } |
| |
| bool StackVisitor::SetVReg(ArtMethod* m, |
| uint16_t vreg, |
| uint32_t new_value, |
| VRegKind kind) { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| if (code_item == nullptr) { |
| return false; |
| } |
| ShadowFrame* shadow_frame = GetCurrentShadowFrame(); |
| if (shadow_frame == nullptr) { |
| // This is a compiled frame: we must prepare and update a shadow frame that will |
| // be executed by the interpreter after deoptimization of the stack. |
| const size_t frame_id = GetFrameId(); |
| const uint16_t num_regs = code_item->registers_size_; |
| shadow_frame = thread_->FindOrCreateDebuggerShadowFrame(frame_id, num_regs, m, GetDexPc()); |
| CHECK(shadow_frame != nullptr); |
| // Remember the vreg has been set for debugging and must not be overwritten by the |
| // original value during deoptimization of the stack. |
| thread_->GetUpdatedVRegFlags(frame_id)[vreg] = true; |
| } |
| if (kind == kReferenceVReg) { |
| shadow_frame->SetVRegReference(vreg, reinterpret_cast<mirror::Object*>(new_value)); |
| } else { |
| shadow_frame->SetVReg(vreg, new_value); |
| } |
| return true; |
| } |
| |
| bool StackVisitor::SetVRegPair(ArtMethod* m, |
| uint16_t vreg, |
| uint64_t new_value, |
| VRegKind kind_lo, |
| VRegKind kind_hi) { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| UNREACHABLE(); |
| } |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| if (code_item == nullptr) { |
| return false; |
| } |
| ShadowFrame* shadow_frame = GetCurrentShadowFrame(); |
| if (shadow_frame == nullptr) { |
| // This is a compiled frame: we must prepare for deoptimization (see SetVRegFromDebugger). |
| const size_t frame_id = GetFrameId(); |
| const uint16_t num_regs = code_item->registers_size_; |
| shadow_frame = thread_->FindOrCreateDebuggerShadowFrame(frame_id, num_regs, m, GetDexPc()); |
| CHECK(shadow_frame != nullptr); |
| // Remember the vreg pair has been set for debugging and must not be overwritten by the |
| // original value during deoptimization of the stack. |
| thread_->GetUpdatedVRegFlags(frame_id)[vreg] = true; |
| thread_->GetUpdatedVRegFlags(frame_id)[vreg + 1] = true; |
| } |
| shadow_frame->SetVRegLong(vreg, new_value); |
| return true; |
| } |
| |
| bool StackVisitor::IsAccessibleGPR(uint32_t reg) const { |
| DCHECK(context_ != nullptr); |
| return context_->IsAccessibleGPR(reg); |
| } |
| |
| uintptr_t* StackVisitor::GetGPRAddress(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetGPRAddress(reg); |
| } |
| |
| uintptr_t StackVisitor::GetGPR(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetGPR(reg); |
| } |
| |
| bool StackVisitor::IsAccessibleFPR(uint32_t reg) const { |
| DCHECK(context_ != nullptr); |
| return context_->IsAccessibleFPR(reg); |
| } |
| |
| uintptr_t StackVisitor::GetFPR(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetFPR(reg); |
| } |
| |
| uintptr_t StackVisitor::GetReturnPc() const { |
| uint8_t* sp = reinterpret_cast<uint8_t*>(GetCurrentQuickFrame()); |
| DCHECK(sp != nullptr); |
| uint8_t* pc_addr = sp + GetCurrentQuickFrameInfo().GetReturnPcOffset(); |
| return *reinterpret_cast<uintptr_t*>(pc_addr); |
| } |
| |
| void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { |
| uint8_t* sp = reinterpret_cast<uint8_t*>(GetCurrentQuickFrame()); |
| CHECK(sp != nullptr); |
| uint8_t* pc_addr = sp + GetCurrentQuickFrameInfo().GetReturnPcOffset(); |
| *reinterpret_cast<uintptr_t*>(pc_addr) = new_ret_pc; |
| } |
| |
| size_t StackVisitor::ComputeNumFrames(Thread* thread, StackWalkKind walk_kind) { |
| struct NumFramesVisitor : public StackVisitor { |
| NumFramesVisitor(Thread* thread_in, StackWalkKind walk_kind_in) |
| : StackVisitor(thread_in, nullptr, walk_kind_in), frames(0) {} |
| |
| bool VisitFrame() OVERRIDE { |
| frames++; |
| return true; |
| } |
| |
| size_t frames; |
| }; |
| NumFramesVisitor visitor(thread, walk_kind); |
| visitor.WalkStack(true); |
| return visitor.frames; |
| } |
| |
| bool StackVisitor::GetNextMethodAndDexPc(ArtMethod** next_method, uint32_t* next_dex_pc) { |
| struct HasMoreFramesVisitor : public StackVisitor { |
| HasMoreFramesVisitor(Thread* thread, |
| StackWalkKind walk_kind, |
| size_t num_frames, |
| size_t frame_height) |
| : StackVisitor(thread, nullptr, walk_kind, num_frames), |
| frame_height_(frame_height), |
| found_frame_(false), |
| has_more_frames_(false), |
| next_method_(nullptr), |
| next_dex_pc_(0) { |
| } |
| |
| bool VisitFrame() OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { |
| if (found_frame_) { |
| ArtMethod* method = GetMethod(); |
| if (method != nullptr && !method->IsRuntimeMethod()) { |
| has_more_frames_ = true; |
| next_method_ = method; |
| next_dex_pc_ = GetDexPc(); |
| return false; // End stack walk once next method is found. |
| } |
| } else if (GetFrameHeight() == frame_height_) { |
| found_frame_ = true; |
| } |
| return true; |
| } |
| |
| size_t frame_height_; |
| bool found_frame_; |
| bool has_more_frames_; |
| ArtMethod* next_method_; |
| uint32_t next_dex_pc_; |
| }; |
| HasMoreFramesVisitor visitor(thread_, walk_kind_, GetNumFrames(), GetFrameHeight()); |
| visitor.WalkStack(true); |
| *next_method = visitor.next_method_; |
| *next_dex_pc = visitor.next_dex_pc_; |
| return visitor.has_more_frames_; |
| } |
| |
| void StackVisitor::DescribeStack(Thread* thread) { |
| struct DescribeStackVisitor : public StackVisitor { |
| explicit DescribeStackVisitor(Thread* thread_in) |
| : StackVisitor(thread_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {} |
| |
| bool VisitFrame() OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { |
| LOG(INFO) << "Frame Id=" << GetFrameId() << " " << DescribeLocation(); |
| return true; |
| } |
| }; |
| DescribeStackVisitor visitor(thread); |
| visitor.WalkStack(true); |
| } |
| |
| std::string StackVisitor::DescribeLocation() const { |
| std::string result("Visiting method '"); |
| ArtMethod* m = GetMethod(); |
| if (m == nullptr) { |
| return "upcall"; |
| } |
| result += PrettyMethod(m); |
| result += StringPrintf("' at dex PC 0x%04x", GetDexPc()); |
| if (!IsShadowFrame()) { |
| result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); |
| } |
| return result; |
| } |
| |
| static instrumentation::InstrumentationStackFrame& GetInstrumentationStackFrame(Thread* thread, |
| uint32_t depth) { |
| CHECK_LT(depth, thread->GetInstrumentationStack()->size()); |
| return thread->GetInstrumentationStack()->at(depth); |
| } |
| |
| static void AssertPcIsWithinQuickCode(ArtMethod* method, uintptr_t pc) |
| SHARED_REQUIRES(Locks::mutator_lock_) { |
| if (method->IsNative() || method->IsRuntimeMethod() || method->IsProxyMethod()) { |
| return; |
| } |
| |
| if (pc == reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc())) { |
| return; |
| } |
| |
| const void* code = method->GetEntryPointFromQuickCompiledCode(); |
| if (code == GetQuickInstrumentationEntryPoint()) { |
| return; |
| } |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| if (class_linker->IsQuickToInterpreterBridge(code) || |
| class_linker->IsQuickResolutionStub(code)) { |
| return; |
| } |
| |
| // If we are the JIT then we may have just compiled the method after the |
| // IsQuickToInterpreterBridge check. |
| jit::Jit* const jit = Runtime::Current()->GetJit(); |
| if (jit != nullptr && jit->GetCodeCache()->ContainsPc(code)) { |
| return; |
| } |
| |
| uint32_t code_size = OatQuickMethodHeader::FromEntryPoint(code)->code_size_; |
| uintptr_t code_start = reinterpret_cast<uintptr_t>(code); |
| CHECK(code_start <= pc && pc <= (code_start + code_size)) |
| << PrettyMethod(method) |
| << " pc=" << std::hex << pc |
| << " code_start=" << code_start |
| << " code_size=" << code_size; |
| } |
| |
| void StackVisitor::SanityCheckFrame() const { |
| if (kIsDebugBuild) { |
| ArtMethod* method = GetMethod(); |
| auto* declaring_class = method->GetDeclaringClass(); |
| // Runtime methods have null declaring class. |
| if (!method->IsRuntimeMethod()) { |
| CHECK(declaring_class != nullptr); |
| CHECK_EQ(declaring_class->GetClass(), declaring_class->GetClass()->GetClass()) |
| << declaring_class; |
| } else { |
| CHECK(declaring_class == nullptr); |
| } |
| Runtime* const runtime = Runtime::Current(); |
| LinearAlloc* const linear_alloc = runtime->GetLinearAlloc(); |
| if (!linear_alloc->Contains(method)) { |
| // Check class linker linear allocs. |
| mirror::Class* klass = method->GetDeclaringClass(); |
| LinearAlloc* const class_linear_alloc = (klass != nullptr) |
| ? ClassLinker::GetAllocatorForClassLoader(klass->GetClassLoader()) |
| : linear_alloc; |
| if (!class_linear_alloc->Contains(method)) { |
| // Check image space. |
| bool in_image = false; |
| for (auto& space : runtime->GetHeap()->GetContinuousSpaces()) { |
| if (space->IsImageSpace()) { |
| auto* image_space = space->AsImageSpace(); |
| const auto& header = image_space->GetImageHeader(); |
| const auto* methods = &header.GetMethodsSection(); |
| if (methods->Contains(reinterpret_cast<const uint8_t*>(method) - image_space->Begin())) { |
| in_image = true; |
| break; |
| } |
| } |
| } |
| CHECK(in_image) << PrettyMethod(method) << " not in linear alloc or image"; |
| } |
| } |
| if (cur_quick_frame_ != nullptr) { |
| AssertPcIsWithinQuickCode(method, cur_quick_frame_pc_); |
| // Frame sanity. |
| size_t frame_size = GetCurrentQuickFrameInfo().FrameSizeInBytes(); |
| CHECK_NE(frame_size, 0u); |
| // A rough guess at an upper size we expect to see for a frame. |
| // 256 registers |
| // 2 words HandleScope overhead |
| // 3+3 register spills |
| // TODO: this seems architecture specific for the case of JNI frames. |
| // TODO: 083-compiler-regressions ManyFloatArgs shows this estimate is wrong. |
| // const size_t kMaxExpectedFrameSize = (256 + 2 + 3 + 3) * sizeof(word); |
| const size_t kMaxExpectedFrameSize = 2 * KB; |
| CHECK_LE(frame_size, kMaxExpectedFrameSize) << PrettyMethod(method); |
| size_t return_pc_offset = GetCurrentQuickFrameInfo().GetReturnPcOffset(); |
| CHECK_LT(return_pc_offset, frame_size); |
| } |
| } |
| } |
| |
| // Counts the number of references in the parameter list of the corresponding method. |
| // Note: Thus does _not_ include "this" for non-static methods. |
| static uint32_t GetNumberOfReferenceArgsWithoutReceiver(ArtMethod* method) |
| SHARED_REQUIRES(Locks::mutator_lock_) { |
| uint32_t shorty_len; |
| const char* shorty = method->GetShorty(&shorty_len); |
| uint32_t refs = 0; |
| for (uint32_t i = 1; i < shorty_len ; ++i) { |
| if (shorty[i] == 'L') { |
| refs++; |
| } |
| } |
| return refs; |
| } |
| |
| QuickMethodFrameInfo StackVisitor::GetCurrentQuickFrameInfo() const { |
| if (cur_oat_quick_method_header_ != nullptr) { |
| return cur_oat_quick_method_header_->GetFrameInfo(); |
| } |
| |
| ArtMethod* method = GetMethod(); |
| Runtime* runtime = Runtime::Current(); |
| |
| if (method->IsAbstract()) { |
| return runtime->GetCalleeSaveMethodFrameInfo(Runtime::kRefsAndArgs); |
| } |
| |
| // This goes before IsProxyMethod since runtime methods have a null declaring class. |
| if (method->IsRuntimeMethod()) { |
| return runtime->GetRuntimeMethodFrameInfo(method); |
| } |
| |
| if (method->IsProxyMethod()) { |
| // There is only one direct method of a proxy class: the constructor. A direct method is |
| // cloned from the original java.lang.reflect.Proxy and is executed as usual quick |
| // compiled method without any stubs. Therefore the method must have a OatQuickMethodHeader. |
| DCHECK(!method->IsDirect() && !method->IsConstructor()) |
| << "Constructors of proxy classes must have a OatQuickMethodHeader"; |
| return runtime->GetCalleeSaveMethodFrameInfo(Runtime::kRefsAndArgs); |
| } |
| |
| // The only remaining case is if the method is native and uses the generic JNI stub. |
| DCHECK(method->IsNative()); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(method, sizeof(void*)); |
| DCHECK(class_linker->IsQuickGenericJniStub(entry_point)) << PrettyMethod(method); |
| // Generic JNI frame. |
| uint32_t handle_refs = GetNumberOfReferenceArgsWithoutReceiver(method) + 1; |
| size_t scope_size = HandleScope::SizeOf(handle_refs); |
| QuickMethodFrameInfo callee_info = runtime->GetCalleeSaveMethodFrameInfo(Runtime::kRefsAndArgs); |
| |
| // Callee saves + handle scope + method ref + alignment |
| // Note: -sizeof(void*) since callee-save frame stores a whole method pointer. |
| size_t frame_size = RoundUp( |
| callee_info.FrameSizeInBytes() - sizeof(void*) + sizeof(ArtMethod*) + scope_size, |
| kStackAlignment); |
| return QuickMethodFrameInfo(frame_size, callee_info.CoreSpillMask(), callee_info.FpSpillMask()); |
| } |
| |
| void StackVisitor::WalkStack(bool include_transitions) { |
| DCHECK(thread_ == Thread::Current() || thread_->IsSuspended()); |
| CHECK_EQ(cur_depth_, 0U); |
| bool exit_stubs_installed = Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled(); |
| uint32_t instrumentation_stack_depth = 0; |
| size_t inlined_frames_count = 0; |
| |
| for (const ManagedStack* current_fragment = thread_->GetManagedStack(); |
| current_fragment != nullptr; current_fragment = current_fragment->GetLink()) { |
| cur_shadow_frame_ = current_fragment->GetTopShadowFrame(); |
| cur_quick_frame_ = current_fragment->GetTopQuickFrame(); |
| cur_quick_frame_pc_ = 0; |
| cur_oat_quick_method_header_ = nullptr; |
| |
| if (cur_quick_frame_ != nullptr) { // Handle quick stack frames. |
| // Can't be both a shadow and a quick fragment. |
| DCHECK(current_fragment->GetTopShadowFrame() == nullptr); |
| ArtMethod* method = *cur_quick_frame_; |
| while (method != nullptr) { |
| cur_oat_quick_method_header_ = method->GetOatQuickMethodHeader(cur_quick_frame_pc_); |
| SanityCheckFrame(); |
| |
| if ((walk_kind_ == StackWalkKind::kIncludeInlinedFrames) |
| && (cur_oat_quick_method_header_ != nullptr) |
| && cur_oat_quick_method_header_->IsOptimized()) { |
| CodeInfo code_info = cur_oat_quick_method_header_->GetOptimizedCodeInfo(); |
| StackMapEncoding encoding = code_info.ExtractEncoding(); |
| uint32_t native_pc_offset = |
| cur_oat_quick_method_header_->NativeQuickPcOffset(cur_quick_frame_pc_); |
| StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); |
| if (stack_map.IsValid() && stack_map.HasInlineInfo(encoding)) { |
| InlineInfo inline_info = code_info.GetInlineInfoOf(stack_map, encoding); |
| DCHECK_EQ(current_inlining_depth_, 0u); |
| for (current_inlining_depth_ = inline_info.GetDepth(); |
| current_inlining_depth_ != 0; |
| --current_inlining_depth_) { |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| cur_depth_++; |
| inlined_frames_count++; |
| } |
| } |
| } |
| |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| |
| QuickMethodFrameInfo frame_info = GetCurrentQuickFrameInfo(); |
| if (context_ != nullptr) { |
| context_->FillCalleeSaves(reinterpret_cast<uint8_t*>(cur_quick_frame_), frame_info); |
| } |
| // Compute PC for next stack frame from return PC. |
| size_t frame_size = frame_info.FrameSizeInBytes(); |
| size_t return_pc_offset = frame_size - sizeof(void*); |
| uint8_t* return_pc_addr = reinterpret_cast<uint8_t*>(cur_quick_frame_) + return_pc_offset; |
| uintptr_t return_pc = *reinterpret_cast<uintptr_t*>(return_pc_addr); |
| |
| if (UNLIKELY(exit_stubs_installed)) { |
| // While profiling, the return pc is restored from the side stack, except when walking |
| // the stack for an exception where the side stack will be unwound in VisitFrame. |
| if (reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) == return_pc) { |
| const instrumentation::InstrumentationStackFrame& instrumentation_frame = |
| GetInstrumentationStackFrame(thread_, instrumentation_stack_depth); |
| instrumentation_stack_depth++; |
| if (GetMethod() == Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveAll)) { |
| // Skip runtime save all callee frames which are used to deliver exceptions. |
| } else if (instrumentation_frame.interpreter_entry_) { |
| ArtMethod* callee = Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); |
| CHECK_EQ(GetMethod(), callee) << "Expected: " << PrettyMethod(callee) << " Found: " |
| << PrettyMethod(GetMethod()); |
| } else { |
| CHECK_EQ(instrumentation_frame.method_, GetMethod()) |
| << "Expected: " << PrettyMethod(instrumentation_frame.method_) |
| << " Found: " << PrettyMethod(GetMethod()); |
| } |
| if (num_frames_ != 0) { |
| // Check agreement of frame Ids only if num_frames_ is computed to avoid infinite |
| // recursion. |
| size_t frame_id = instrumentation::Instrumentation::ComputeFrameId( |
| thread_, |
| cur_depth_, |
| inlined_frames_count); |
| CHECK_EQ(instrumentation_frame.frame_id_, frame_id); |
| } |
| return_pc = instrumentation_frame.return_pc_; |
| } |
| } |
| |
| cur_quick_frame_pc_ = return_pc; |
| uint8_t* next_frame = reinterpret_cast<uint8_t*>(cur_quick_frame_) + frame_size; |
| cur_quick_frame_ = reinterpret_cast<ArtMethod**>(next_frame); |
| |
| if (kDebugStackWalk) { |
| LOG(INFO) << PrettyMethod(method) << "@" << method << " size=" << frame_size |
| << std::boolalpha |
| << " optimized=" << (cur_oat_quick_method_header_ != nullptr && |
| cur_oat_quick_method_header_->IsOptimized()) |
| << " native=" << method->IsNative() |
| << std::noboolalpha |
| << " entrypoints=" << method->GetEntryPointFromQuickCompiledCode() |
| << "," << method->GetEntryPointFromJni() |
| << " next=" << *cur_quick_frame_; |
| } |
| |
| cur_depth_++; |
| method = *cur_quick_frame_; |
| } |
| } else if (cur_shadow_frame_ != nullptr) { |
| do { |
| SanityCheckFrame(); |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| cur_depth_++; |
| cur_shadow_frame_ = cur_shadow_frame_->GetLink(); |
| } while (cur_shadow_frame_ != nullptr); |
| } |
| if (include_transitions) { |
| bool should_continue = VisitFrame(); |
| if (!should_continue) { |
| return; |
| } |
| } |
| cur_depth_++; |
| } |
| if (num_frames_ != 0) { |
| CHECK_EQ(cur_depth_, num_frames_); |
| } |
| } |
| |
| void JavaFrameRootInfo::Describe(std::ostream& os) const { |
| const StackVisitor* visitor = stack_visitor_; |
| CHECK(visitor != nullptr); |
| os << "Type=" << GetType() << " thread_id=" << GetThreadId() << " location=" << |
| visitor->DescribeLocation() << " vreg=" << vreg_; |
| } |
| |
| int StackVisitor::GetVRegOffsetFromQuickCode(const DexFile::CodeItem* code_item, |
| uint32_t core_spills, uint32_t fp_spills, |
| size_t frame_size, int reg, InstructionSet isa) { |
| size_t pointer_size = InstructionSetPointerSize(isa); |
| if (kIsDebugBuild) { |
| auto* runtime = Runtime::Current(); |
| if (runtime != nullptr) { |
| CHECK_EQ(runtime->GetClassLinker()->GetImagePointerSize(), pointer_size); |
| } |
| } |
| DCHECK_ALIGNED(frame_size, kStackAlignment); |
| DCHECK_NE(reg, -1); |
| int spill_size = POPCOUNT(core_spills) * GetBytesPerGprSpillLocation(isa) |
| + POPCOUNT(fp_spills) * GetBytesPerFprSpillLocation(isa) |
| + sizeof(uint32_t); // Filler. |
| int num_regs = code_item->registers_size_ - code_item->ins_size_; |
| int temp_threshold = code_item->registers_size_; |
| const int max_num_special_temps = 1; |
| if (reg == temp_threshold) { |
| // The current method pointer corresponds to special location on stack. |
| return 0; |
| } else if (reg >= temp_threshold + max_num_special_temps) { |
| /* |
| * Special temporaries may have custom locations and the logic above deals with that. |
| * However, non-special temporaries are placed relative to the outs. |
| */ |
| int temps_start = code_item->outs_size_ * sizeof(uint32_t) + pointer_size /* art method */; |
| int relative_offset = (reg - (temp_threshold + max_num_special_temps)) * sizeof(uint32_t); |
| return temps_start + relative_offset; |
| } else if (reg < num_regs) { |
| int locals_start = frame_size - spill_size - num_regs * sizeof(uint32_t); |
| return locals_start + (reg * sizeof(uint32_t)); |
| } else { |
| // Handle ins. |
| return frame_size + ((reg - num_regs) * sizeof(uint32_t)) + pointer_size /* art method */; |
| } |
| } |
| |
| void LockCountData::AddMonitorInternal(Thread* self, mirror::Object* obj) { |
| if (obj == nullptr) { |
| return; |
| } |
| |
| // If there's an error during enter, we won't have locked the monitor. So check there's no |
| // exception. |
| if (self->IsExceptionPending()) { |
| return; |
| } |
| |
| if (monitors_ == nullptr) { |
| monitors_.reset(new std::vector<mirror::Object*>()); |
| } |
| monitors_->push_back(obj); |
| } |
| |
| void LockCountData::RemoveMonitorInternal(Thread* self, const mirror::Object* obj) { |
| if (obj == nullptr) { |
| return; |
| } |
| bool found_object = false; |
| if (monitors_ != nullptr) { |
| // We need to remove one pointer to ref, as duplicates are used for counting recursive locks. |
| // We arbitrarily choose the first one. |
| auto it = std::find(monitors_->begin(), monitors_->end(), obj); |
| if (it != monitors_->end()) { |
| monitors_->erase(it); |
| found_object = true; |
| } |
| } |
| if (!found_object) { |
| // The object wasn't found. Time for an IllegalMonitorStateException. |
| // The order here isn't fully clear. Assume that any other pending exception is swallowed. |
| // TODO: Maybe make already pending exception a suppressed exception. |
| self->ClearException(); |
| self->ThrowNewExceptionF("Ljava/lang/IllegalMonitorStateException;", |
| "did not lock monitor on object of type '%s' before unlocking", |
| PrettyTypeOf(const_cast<mirror::Object*>(obj)).c_str()); |
| } |
| } |
| |
| // Helper to unlock a monitor. Must be NO_THREAD_SAFETY_ANALYSIS, as we can't statically show |
| // that the object was locked. |
| void MonitorExitHelper(Thread* self, mirror::Object* obj) NO_THREAD_SAFETY_ANALYSIS { |
| DCHECK(self != nullptr); |
| DCHECK(obj != nullptr); |
| obj->MonitorExit(self); |
| } |
| |
| bool LockCountData::CheckAllMonitorsReleasedInternal(Thread* self) { |
| DCHECK(self != nullptr); |
| if (monitors_ != nullptr) { |
| if (!monitors_->empty()) { |
| // There may be an exception pending, if the method is terminating abruptly. Clear it. |
| // TODO: Should we add this as a suppressed exception? |
| self->ClearException(); |
| |
| // OK, there are monitors that are still locked. To enforce structured locking (and avoid |
| // deadlocks) we unlock all of them before we raise the IllegalMonitorState exception. |
| for (mirror::Object* obj : *monitors_) { |
| MonitorExitHelper(self, obj); |
| // If this raised an exception, ignore. TODO: Should we add this as suppressed |
| // exceptions? |
| if (self->IsExceptionPending()) { |
| self->ClearException(); |
| } |
| } |
| // Raise an exception, just give the first object as the sample. |
| mirror::Object* first = (*monitors_)[0]; |
| self->ThrowNewExceptionF("Ljava/lang/IllegalMonitorStateException;", |
| "did not unlock monitor on object of type '%s'", |
| PrettyTypeOf(first).c_str()); |
| |
| // To make sure this path is not triggered again, clean out the monitors. |
| monitors_->clear(); |
| |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } // namespace art |
