| /* |
| * Copyright (C) 2014 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 "quick_exception_handler.h" |
| #include <ios> |
| |
| #include "arch/context.h" |
| #include "art_method-inl.h" |
| #include "base/enums.h" |
| #include "base/globals.h" |
| #include "base/logging.h" // For VLOG_IS_ON. |
| #include "base/systrace.h" |
| #include "dex/dex_file_types.h" |
| #include "dex/dex_instruction.h" |
| #include "entrypoints/entrypoint_utils.h" |
| #include "entrypoints/quick/quick_entrypoints_enum.h" |
| #include "entrypoints/runtime_asm_entrypoints.h" |
| #include "handle_scope-inl.h" |
| #include "interpreter/shadow_frame-inl.h" |
| #include "jit/jit.h" |
| #include "jit/jit_code_cache.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/throwable.h" |
| #include "nterp_helpers.h" |
| #include "oat_quick_method_header.h" |
| #include "stack.h" |
| #include "stack_map.h" |
| |
| namespace art { |
| |
| static constexpr bool kDebugExceptionDelivery = false; |
| static constexpr size_t kInvalidFrameDepth = 0xffffffff; |
| |
| QuickExceptionHandler::QuickExceptionHandler(Thread* self, bool is_deoptimization) |
| : self_(self), |
| context_(self->GetLongJumpContext()), |
| is_deoptimization_(is_deoptimization), |
| method_tracing_active_(is_deoptimization || |
| Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()), |
| handler_quick_frame_(nullptr), |
| handler_quick_frame_pc_(0), |
| handler_method_header_(nullptr), |
| handler_quick_arg0_(0), |
| handler_dex_pc_(0), |
| clear_exception_(false), |
| handler_frame_depth_(kInvalidFrameDepth), |
| full_fragment_done_(false) {} |
| |
| // Finds catch handler. |
| class CatchBlockStackVisitor final : public StackVisitor { |
| public: |
| CatchBlockStackVisitor(Thread* self, |
| Context* context, |
| Handle<mirror::Throwable>* exception, |
| QuickExceptionHandler* exception_handler, |
| uint32_t skip_frames) |
| REQUIRES_SHARED(Locks::mutator_lock_) |
| : StackVisitor(self, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), |
| exception_(exception), |
| exception_handler_(exception_handler), |
| skip_frames_(skip_frames) { |
| } |
| |
| bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtMethod* method = GetMethod(); |
| exception_handler_->SetHandlerFrameDepth(GetFrameDepth()); |
| if (method == nullptr) { |
| DCHECK_EQ(skip_frames_, 0u) |
| << "We tried to skip an upcall! We should have returned to the upcall to finish delivery"; |
| // This is the upcall, we remember the frame and last pc so that we may long jump to them. |
| exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc()); |
| exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame()); |
| return false; // End stack walk. |
| } |
| if (skip_frames_ != 0) { |
| skip_frames_--; |
| return true; |
| } |
| if (method->IsRuntimeMethod()) { |
| // Ignore callee save method. |
| DCHECK(method->IsCalleeSaveMethod()); |
| return true; |
| } |
| return HandleTryItems(method); |
| } |
| |
| private: |
| bool HandleTryItems(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| uint32_t dex_pc = dex::kDexNoIndex; |
| if (!method->IsNative()) { |
| dex_pc = GetDexPc(); |
| } |
| if (dex_pc != dex::kDexNoIndex) { |
| bool clear_exception = false; |
| StackHandleScope<1> hs(GetThread()); |
| Handle<mirror::Class> to_find(hs.NewHandle((*exception_)->GetClass())); |
| uint32_t found_dex_pc = method->FindCatchBlock(to_find, dex_pc, &clear_exception); |
| exception_handler_->SetClearException(clear_exception); |
| if (found_dex_pc != dex::kDexNoIndex) { |
| exception_handler_->SetHandlerDexPc(found_dex_pc); |
| exception_handler_->SetHandlerQuickFramePc( |
| GetCurrentOatQuickMethodHeader()->ToNativeQuickPc( |
| method, found_dex_pc, /* is_for_catch_handler= */ true)); |
| exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame()); |
| exception_handler_->SetHandlerMethodHeader(GetCurrentOatQuickMethodHeader()); |
| return false; // End stack walk. |
| } else if (UNLIKELY(GetThread()->HasDebuggerShadowFrames())) { |
| // We are going to unwind this frame. Did we prepare a shadow frame for debugging? |
| size_t frame_id = GetFrameId(); |
| ShadowFrame* frame = GetThread()->FindDebuggerShadowFrame(frame_id); |
| if (frame != nullptr) { |
| // We will not execute this shadow frame so we can safely deallocate it. |
| GetThread()->RemoveDebuggerShadowFrameMapping(frame_id); |
| ShadowFrame::DeleteDeoptimizedFrame(frame); |
| } |
| } |
| } |
| return true; // Continue stack walk. |
| } |
| |
| // The exception we're looking for the catch block of. |
| Handle<mirror::Throwable>* exception_; |
| // The quick exception handler we're visiting for. |
| QuickExceptionHandler* const exception_handler_; |
| // The number of frames to skip searching for catches in. |
| uint32_t skip_frames_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CatchBlockStackVisitor); |
| }; |
| |
| // Finds the appropriate exception catch after calling all method exit instrumentation functions. |
| // Note that this might change the exception being thrown. |
| void QuickExceptionHandler::FindCatch(ObjPtr<mirror::Throwable> exception) { |
| DCHECK(!is_deoptimization_); |
| instrumentation::InstrumentationStackPopper popper(self_); |
| // The number of total frames we have so far popped. |
| uint32_t already_popped = 0; |
| bool popped_to_top = true; |
| StackHandleScope<1> hs(self_); |
| MutableHandle<mirror::Throwable> exception_ref(hs.NewHandle(exception)); |
| // Sending the instrumentation events (done by the InstrumentationStackPopper) can cause new |
| // exceptions to be thrown which will override the current exception. Therefore we need to perform |
| // the search for a catch in a loop until we have successfully popped all the way to a catch or |
| // the top of the stack. |
| do { |
| if (kDebugExceptionDelivery) { |
| ObjPtr<mirror::String> msg = exception_ref->GetDetailMessage(); |
| std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); |
| self_->DumpStack(LOG_STREAM(INFO) << "Delivering exception: " << exception_ref->PrettyTypeOf() |
| << ": " << str_msg << "\n"); |
| } |
| |
| // Walk the stack to find catch handler. |
| CatchBlockStackVisitor visitor(self_, context_, |
| &exception_ref, |
| this, |
| /*skip_frames=*/already_popped); |
| visitor.WalkStack(true); |
| uint32_t new_pop_count = handler_frame_depth_; |
| DCHECK_GE(new_pop_count, already_popped); |
| already_popped = new_pop_count; |
| |
| if (kDebugExceptionDelivery) { |
| if (*handler_quick_frame_ == nullptr) { |
| LOG(INFO) << "Handler is upcall"; |
| } |
| if (GetHandlerMethod() != nullptr) { |
| const DexFile* dex_file = GetHandlerMethod()->GetDexFile(); |
| int line_number = |
| annotations::GetLineNumFromPC(dex_file, GetHandlerMethod(), handler_dex_pc_); |
| LOG(INFO) << "Handler: " << GetHandlerMethod()->PrettyMethod() << " (line: " |
| << line_number << ")"; |
| } |
| } |
| // Exception was cleared as part of delivery. |
| DCHECK(!self_->IsExceptionPending()); |
| // If the handler is in optimized code, we need to set the catch environment. |
| if (*handler_quick_frame_ != nullptr && |
| handler_method_header_ != nullptr && |
| handler_method_header_->IsOptimized()) { |
| SetCatchEnvironmentForOptimizedHandler(&visitor); |
| } |
| popped_to_top = |
| popper.PopFramesTo(reinterpret_cast<uintptr_t>(handler_quick_frame_), exception_ref); |
| } while (!popped_to_top); |
| if (!clear_exception_) { |
| // Put exception back in root set with clear throw location. |
| self_->SetException(exception_ref.Get()); |
| } |
| } |
| |
| static VRegKind ToVRegKind(DexRegisterLocation::Kind kind) { |
| // Slightly hacky since we cannot map DexRegisterLocationKind and VRegKind |
| // one to one. However, StackVisitor::GetVRegFromOptimizedCode only needs to |
| // distinguish between core/FPU registers and low/high bits on 64-bit. |
| switch (kind) { |
| case DexRegisterLocation::Kind::kConstant: |
| case DexRegisterLocation::Kind::kInStack: |
| // VRegKind is ignored. |
| return VRegKind::kUndefined; |
| |
| case DexRegisterLocation::Kind::kInRegister: |
| // Selects core register. For 64-bit registers, selects low 32 bits. |
| return VRegKind::kLongLoVReg; |
| |
| case DexRegisterLocation::Kind::kInRegisterHigh: |
| // Selects core register. For 64-bit registers, selects high 32 bits. |
| return VRegKind::kLongHiVReg; |
| |
| case DexRegisterLocation::Kind::kInFpuRegister: |
| // Selects FPU register. For 64-bit registers, selects low 32 bits. |
| return VRegKind::kDoubleLoVReg; |
| |
| case DexRegisterLocation::Kind::kInFpuRegisterHigh: |
| // Selects FPU register. For 64-bit registers, selects high 32 bits. |
| return VRegKind::kDoubleHiVReg; |
| |
| default: |
| LOG(FATAL) << "Unexpected vreg location " << kind; |
| UNREACHABLE(); |
| } |
| } |
| |
| void QuickExceptionHandler::SetCatchEnvironmentForOptimizedHandler(StackVisitor* stack_visitor) { |
| DCHECK(!is_deoptimization_); |
| DCHECK(*handler_quick_frame_ != nullptr) << "Method should not be called on upcall exceptions"; |
| DCHECK(GetHandlerMethod() != nullptr && handler_method_header_->IsOptimized()); |
| |
| if (kDebugExceptionDelivery) { |
| self_->DumpStack(LOG_STREAM(INFO) << "Setting catch phis: "); |
| } |
| |
| CodeItemDataAccessor accessor(GetHandlerMethod()->DexInstructionData()); |
| const size_t number_of_vregs = accessor.RegistersSize(); |
| CodeInfo code_info(handler_method_header_); |
| |
| // Find stack map of the catch block. |
| StackMap catch_stack_map = code_info.GetCatchStackMapForDexPc(GetHandlerDexPc()); |
| DCHECK(catch_stack_map.IsValid()); |
| DexRegisterMap catch_vreg_map = code_info.GetDexRegisterMapOf(catch_stack_map); |
| DCHECK_EQ(catch_vreg_map.size(), number_of_vregs); |
| |
| if (!catch_vreg_map.HasAnyLiveDexRegisters()) { |
| return; |
| } |
| |
| // Find stack map of the throwing instruction. |
| StackMap throw_stack_map = |
| code_info.GetStackMapForNativePcOffset(stack_visitor->GetNativePcOffset()); |
| DCHECK(throw_stack_map.IsValid()); |
| DexRegisterMap throw_vreg_map = code_info.GetDexRegisterMapOf(throw_stack_map); |
| DCHECK_EQ(throw_vreg_map.size(), number_of_vregs); |
| |
| // Copy values between them. |
| for (uint16_t vreg = 0; vreg < number_of_vregs; ++vreg) { |
| DexRegisterLocation::Kind catch_location = catch_vreg_map[vreg].GetKind(); |
| if (catch_location == DexRegisterLocation::Kind::kNone) { |
| continue; |
| } |
| DCHECK(catch_location == DexRegisterLocation::Kind::kInStack); |
| |
| // Get vreg value from its current location. |
| uint32_t vreg_value; |
| VRegKind vreg_kind = ToVRegKind(throw_vreg_map[vreg].GetKind()); |
| bool get_vreg_success = |
| stack_visitor->GetVReg(stack_visitor->GetMethod(), |
| vreg, |
| vreg_kind, |
| &vreg_value, |
| throw_vreg_map[vreg]); |
| CHECK(get_vreg_success) << "VReg " << vreg << " was optimized out (" |
| << "method=" << ArtMethod::PrettyMethod(stack_visitor->GetMethod()) |
| << ", dex_pc=" << stack_visitor->GetDexPc() << ", " |
| << "native_pc_offset=" << stack_visitor->GetNativePcOffset() << ")"; |
| |
| // Copy value to the catch phi's stack slot. |
| int32_t slot_offset = catch_vreg_map[vreg].GetStackOffsetInBytes(); |
| ArtMethod** frame_top = stack_visitor->GetCurrentQuickFrame(); |
| uint8_t* slot_address = reinterpret_cast<uint8_t*>(frame_top) + slot_offset; |
| uint32_t* slot_ptr = reinterpret_cast<uint32_t*>(slot_address); |
| *slot_ptr = vreg_value; |
| } |
| } |
| |
| // Prepares deoptimization. |
| class DeoptimizeStackVisitor final : public StackVisitor { |
| public: |
| DeoptimizeStackVisitor(Thread* self, |
| Context* context, |
| QuickExceptionHandler* exception_handler, |
| bool single_frame) |
| REQUIRES_SHARED(Locks::mutator_lock_) |
| : StackVisitor(self, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), |
| exception_handler_(exception_handler), |
| prev_shadow_frame_(nullptr), |
| stacked_shadow_frame_pushed_(false), |
| single_frame_deopt_(single_frame), |
| single_frame_done_(false), |
| single_frame_deopt_method_(nullptr), |
| single_frame_deopt_quick_method_header_(nullptr), |
| callee_method_(nullptr) { |
| } |
| |
| ArtMethod* GetSingleFrameDeoptMethod() const { |
| return single_frame_deopt_method_; |
| } |
| |
| const OatQuickMethodHeader* GetSingleFrameDeoptQuickMethodHeader() const { |
| return single_frame_deopt_quick_method_header_; |
| } |
| |
| void FinishStackWalk() REQUIRES_SHARED(Locks::mutator_lock_) { |
| // This is the upcall, or the next full frame in single-frame deopt, or the |
| // code isn't deoptimizeable. We remember the frame and last pc so that we |
| // may long jump to them. |
| exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc()); |
| exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame()); |
| exception_handler_->SetHandlerMethodHeader(GetCurrentOatQuickMethodHeader()); |
| if (!stacked_shadow_frame_pushed_) { |
| // In case there is no deoptimized shadow frame for this upcall, we still |
| // need to push a nullptr to the stack since there is always a matching pop after |
| // the long jump. |
| GetThread()->PushStackedShadowFrame(nullptr, |
| StackedShadowFrameType::kDeoptimizationShadowFrame); |
| stacked_shadow_frame_pushed_ = true; |
| } |
| if (GetMethod() == nullptr) { |
| exception_handler_->SetFullFragmentDone(true); |
| } else { |
| CHECK(callee_method_ != nullptr) << GetMethod()->PrettyMethod(false); |
| exception_handler_->SetHandlerQuickArg0(reinterpret_cast<uintptr_t>(callee_method_)); |
| } |
| } |
| |
| bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) { |
| exception_handler_->SetHandlerFrameDepth(GetFrameDepth()); |
| ArtMethod* method = GetMethod(); |
| VLOG(deopt) << "Deoptimizing stack: depth: " << GetFrameDepth() |
| << " at method " << ArtMethod::PrettyMethod(method); |
| if (method == nullptr || single_frame_done_) { |
| FinishStackWalk(); |
| return false; // End stack walk. |
| } else if (method->IsRuntimeMethod()) { |
| // Ignore callee save method. |
| DCHECK(method->IsCalleeSaveMethod()); |
| return true; |
| } else if (method->IsNative()) { |
| // If we return from JNI with a pending exception and want to deoptimize, we need to skip |
| // the native method. |
| // The top method is a runtime method, the native method comes next. |
| CHECK_EQ(GetFrameDepth(), 1U); |
| callee_method_ = method; |
| return true; |
| } else if (!single_frame_deopt_ && |
| !Runtime::Current()->IsAsyncDeoptimizeable(GetCurrentQuickFramePc())) { |
| // We hit some code that's not deoptimizeable. However, Single-frame deoptimization triggered |
| // from compiled code is always allowed since HDeoptimize always saves the full environment. |
| LOG(WARNING) << "Got request to deoptimize un-deoptimizable method " |
| << method->PrettyMethod(); |
| FinishStackWalk(); |
| return false; // End stack walk. |
| } else { |
| // Check if a shadow frame already exists for debugger's set-local-value purpose. |
| const size_t frame_id = GetFrameId(); |
| ShadowFrame* new_frame = GetThread()->FindDebuggerShadowFrame(frame_id); |
| const bool* updated_vregs; |
| CodeItemDataAccessor accessor(method->DexInstructionData()); |
| const size_t num_regs = accessor.RegistersSize(); |
| if (new_frame == nullptr) { |
| new_frame = ShadowFrame::CreateDeoptimizedFrame(num_regs, nullptr, method, GetDexPc()); |
| updated_vregs = nullptr; |
| } else { |
| updated_vregs = GetThread()->GetUpdatedVRegFlags(frame_id); |
| DCHECK(updated_vregs != nullptr); |
| } |
| if (GetCurrentOatQuickMethodHeader()->IsNterpMethodHeader()) { |
| HandleNterpDeoptimization(method, new_frame, updated_vregs); |
| } else { |
| HandleOptimizingDeoptimization(method, new_frame, updated_vregs); |
| } |
| if (updated_vregs != nullptr) { |
| // Calling Thread::RemoveDebuggerShadowFrameMapping will also delete the updated_vregs |
| // array so this must come after we processed the frame. |
| GetThread()->RemoveDebuggerShadowFrameMapping(frame_id); |
| DCHECK(GetThread()->FindDebuggerShadowFrame(frame_id) == nullptr); |
| } |
| if (prev_shadow_frame_ != nullptr) { |
| prev_shadow_frame_->SetLink(new_frame); |
| } else { |
| // Will be popped after the long jump after DeoptimizeStack(), |
| // right before interpreter::EnterInterpreterFromDeoptimize(). |
| stacked_shadow_frame_pushed_ = true; |
| GetThread()->PushStackedShadowFrame( |
| new_frame, StackedShadowFrameType::kDeoptimizationShadowFrame); |
| } |
| prev_shadow_frame_ = new_frame; |
| |
| if (single_frame_deopt_ && !IsInInlinedFrame()) { |
| // Single-frame deopt ends at the first non-inlined frame and needs to store that method. |
| single_frame_done_ = true; |
| single_frame_deopt_method_ = method; |
| single_frame_deopt_quick_method_header_ = GetCurrentOatQuickMethodHeader(); |
| } |
| callee_method_ = method; |
| return true; |
| } |
| } |
| |
| private: |
| void HandleNterpDeoptimization(ArtMethod* m, |
| ShadowFrame* new_frame, |
| const bool* updated_vregs) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); |
| StackReference<mirror::Object>* vreg_ref_base = |
| reinterpret_cast<StackReference<mirror::Object>*>(NterpGetReferenceArray(cur_quick_frame)); |
| int32_t* vreg_int_base = |
| reinterpret_cast<int32_t*>(NterpGetRegistersArray(cur_quick_frame)); |
| CodeItemDataAccessor accessor(m->DexInstructionData()); |
| const uint16_t num_regs = accessor.RegistersSize(); |
| // An nterp frame has two arrays: a dex register array and a reference array |
| // that shadows the dex register array but only containing references |
| // (non-reference dex registers have nulls). See nterp_helpers.cc. |
| for (size_t reg = 0; reg < num_regs; ++reg) { |
| if (updated_vregs != nullptr && updated_vregs[reg]) { |
| // Keep the value set by debugger. |
| continue; |
| } |
| StackReference<mirror::Object>* ref_addr = vreg_ref_base + reg; |
| mirror::Object* ref = ref_addr->AsMirrorPtr(); |
| if (ref != nullptr) { |
| new_frame->SetVRegReference(reg, ref); |
| } else { |
| new_frame->SetVReg(reg, vreg_int_base[reg]); |
| } |
| } |
| } |
| |
| void HandleOptimizingDeoptimization(ArtMethod* m, |
| ShadowFrame* new_frame, |
| const bool* updated_vregs) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| CodeInfo code_info(method_header); |
| uintptr_t native_pc_offset = method_header->NativeQuickPcOffset(GetCurrentQuickFramePc()); |
| StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset); |
| CodeItemDataAccessor accessor(m->DexInstructionData()); |
| const size_t number_of_vregs = accessor.RegistersSize(); |
| uint32_t register_mask = code_info.GetRegisterMaskOf(stack_map); |
| BitMemoryRegion stack_mask = code_info.GetStackMaskOf(stack_map); |
| DexRegisterMap vreg_map = IsInInlinedFrame() |
| ? code_info.GetInlineDexRegisterMapOf(stack_map, GetCurrentInlinedFrame()) |
| : code_info.GetDexRegisterMapOf(stack_map); |
| |
| if (kIsDebugBuild || UNLIKELY(Runtime::Current()->IsJavaDebuggable())) { |
| CHECK_EQ(vreg_map.size(), number_of_vregs) << *Thread::Current() |
| << "Deopting: " << m->PrettyMethod() |
| << " inlined? " |
| << std::boolalpha << IsInInlinedFrame(); |
| } |
| if (vreg_map.empty()) { |
| return; |
| } |
| |
| for (uint16_t vreg = 0; vreg < number_of_vregs; ++vreg) { |
| if (updated_vregs != nullptr && updated_vregs[vreg]) { |
| // Keep the value set by debugger. |
| continue; |
| } |
| |
| DexRegisterLocation::Kind location = vreg_map[vreg].GetKind(); |
| static constexpr uint32_t kDeadValue = 0xEBADDE09; |
| uint32_t value = kDeadValue; |
| bool is_reference = false; |
| |
| switch (location) { |
| case DexRegisterLocation::Kind::kInStack: { |
| const int32_t offset = vreg_map[vreg].GetStackOffsetInBytes(); |
| const uint8_t* addr = reinterpret_cast<const uint8_t*>(GetCurrentQuickFrame()) + offset; |
| value = *reinterpret_cast<const uint32_t*>(addr); |
| uint32_t bit = (offset >> 2); |
| if (bit < stack_mask.size_in_bits() && stack_mask.LoadBit(bit)) { |
| is_reference = true; |
| } |
| break; |
| } |
| case DexRegisterLocation::Kind::kInRegister: |
| case DexRegisterLocation::Kind::kInRegisterHigh: |
| case DexRegisterLocation::Kind::kInFpuRegister: |
| case DexRegisterLocation::Kind::kInFpuRegisterHigh: { |
| uint32_t reg = vreg_map[vreg].GetMachineRegister(); |
| bool result = GetRegisterIfAccessible(reg, location, &value); |
| CHECK(result); |
| if (location == DexRegisterLocation::Kind::kInRegister) { |
| if (((1u << reg) & register_mask) != 0) { |
| is_reference = true; |
| } |
| } |
| break; |
| } |
| case DexRegisterLocation::Kind::kConstant: { |
| value = vreg_map[vreg].GetConstant(); |
| if (value == 0) { |
| // Make it a reference for extra safety. |
| is_reference = true; |
| } |
| break; |
| } |
| case DexRegisterLocation::Kind::kNone: { |
| break; |
| } |
| default: { |
| LOG(FATAL) << "Unexpected location kind " << vreg_map[vreg].GetKind(); |
| UNREACHABLE(); |
| } |
| } |
| if (is_reference) { |
| new_frame->SetVRegReference(vreg, reinterpret_cast<mirror::Object*>(value)); |
| } else { |
| new_frame->SetVReg(vreg, value); |
| } |
| } |
| } |
| |
| static VRegKind GetVRegKind(uint16_t reg, const std::vector<int32_t>& kinds) { |
| return static_cast<VRegKind>(kinds[reg * 2]); |
| } |
| |
| QuickExceptionHandler* const exception_handler_; |
| ShadowFrame* prev_shadow_frame_; |
| bool stacked_shadow_frame_pushed_; |
| const bool single_frame_deopt_; |
| bool single_frame_done_; |
| ArtMethod* single_frame_deopt_method_; |
| const OatQuickMethodHeader* single_frame_deopt_quick_method_header_; |
| ArtMethod* callee_method_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DeoptimizeStackVisitor); |
| }; |
| |
| void QuickExceptionHandler::PrepareForLongJumpToInvokeStubOrInterpreterBridge() { |
| if (full_fragment_done_) { |
| // Restore deoptimization exception. When returning from the invoke stub, |
| // ArtMethod::Invoke() will see the special exception to know deoptimization |
| // is needed. |
| self_->SetException(Thread::GetDeoptimizationException()); |
| } else { |
| // PC needs to be of the quick-to-interpreter bridge. |
| int32_t offset; |
| offset = GetThreadOffset<kRuntimePointerSize>(kQuickQuickToInterpreterBridge).Int32Value(); |
| handler_quick_frame_pc_ = *reinterpret_cast<uintptr_t*>( |
| reinterpret_cast<uint8_t*>(self_) + offset); |
| } |
| } |
| |
| void QuickExceptionHandler::DeoptimizeStack() { |
| DCHECK(is_deoptimization_); |
| if (kDebugExceptionDelivery) { |
| self_->DumpStack(LOG_STREAM(INFO) << "Deoptimizing: "); |
| } |
| |
| DeoptimizeStackVisitor visitor(self_, context_, this, false); |
| visitor.WalkStack(true); |
| PrepareForLongJumpToInvokeStubOrInterpreterBridge(); |
| } |
| |
| void QuickExceptionHandler::DeoptimizeSingleFrame(DeoptimizationKind kind) { |
| DCHECK(is_deoptimization_); |
| |
| DeoptimizeStackVisitor visitor(self_, context_, this, true); |
| visitor.WalkStack(true); |
| |
| // Compiled code made an explicit deoptimization. |
| ArtMethod* deopt_method = visitor.GetSingleFrameDeoptMethod(); |
| SCOPED_TRACE << "Deoptimizing " |
| << deopt_method->PrettyMethod() |
| << ": " << GetDeoptimizationKindName(kind); |
| |
| DCHECK(deopt_method != nullptr); |
| if (VLOG_IS_ON(deopt) || kDebugExceptionDelivery) { |
| LOG(INFO) << "Single-frame deopting: " |
| << deopt_method->PrettyMethod() |
| << " due to " |
| << GetDeoptimizationKindName(kind); |
| DumpFramesWithType(self_, /* details= */ true); |
| } |
| // When deoptimizing for debug support the optimized code is still valid and |
| // can be reused when debugging support (like breakpoints) are no longer |
| // needed fot this method. |
| if (Runtime::Current()->UseJitCompilation() && (kind != DeoptimizationKind::kDebugging)) { |
| Runtime::Current()->GetJit()->GetCodeCache()->InvalidateCompiledCodeFor( |
| deopt_method, visitor.GetSingleFrameDeoptQuickMethodHeader()); |
| } else { |
| // Transfer the code to interpreter. |
| Runtime::Current()->GetInstrumentation()->UpdateMethodsCode( |
| deopt_method, GetQuickToInterpreterBridge()); |
| } |
| |
| PrepareForLongJumpToInvokeStubOrInterpreterBridge(); |
| } |
| |
| void QuickExceptionHandler::DeoptimizePartialFragmentFixup(uintptr_t return_pc) { |
| // At this point, the instrumentation stack has been updated. We need to install |
| // the real return pc on stack, in case instrumentation stub is stored there, |
| // so that the interpreter bridge code can return to the right place. |
| if (return_pc != 0) { |
| uintptr_t* pc_addr = reinterpret_cast<uintptr_t*>(handler_quick_frame_); |
| CHECK(pc_addr != nullptr); |
| pc_addr--; |
| *reinterpret_cast<uintptr_t*>(pc_addr) = return_pc; |
| } |
| |
| // Architecture-dependent work. This is to get the LR right for x86 and x86-64. |
| if (kRuntimeISA == InstructionSet::kX86 || kRuntimeISA == InstructionSet::kX86_64) { |
| // On x86, the return address is on the stack, so just reuse it. Otherwise we would have to |
| // change how longjump works. |
| handler_quick_frame_ = reinterpret_cast<ArtMethod**>( |
| reinterpret_cast<uintptr_t>(handler_quick_frame_) - sizeof(void*)); |
| } |
| } |
| |
| uintptr_t QuickExceptionHandler::UpdateInstrumentationStack() { |
| DCHECK(is_deoptimization_) << "Non-deoptimization handlers should use FindCatch"; |
| uintptr_t return_pc = 0; |
| if (method_tracing_active_) { |
| instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); |
| return_pc = instrumentation->PopFramesForDeoptimization( |
| self_, reinterpret_cast<uintptr_t>(handler_quick_frame_)); |
| } |
| return return_pc; |
| } |
| |
| void QuickExceptionHandler::DoLongJump(bool smash_caller_saves) { |
| // Place context back on thread so it will be available when we continue. |
| self_->ReleaseLongJumpContext(context_); |
| context_->SetSP(reinterpret_cast<uintptr_t>(handler_quick_frame_)); |
| CHECK_NE(handler_quick_frame_pc_, 0u); |
| context_->SetPC(handler_quick_frame_pc_); |
| context_->SetArg0(handler_quick_arg0_); |
| if (smash_caller_saves) { |
| context_->SmashCallerSaves(); |
| } |
| if (!is_deoptimization_ && |
| handler_method_header_ != nullptr && |
| handler_method_header_->IsNterpMethodHeader()) { |
| context_->SetNterpDexPC(reinterpret_cast<uintptr_t>( |
| GetHandlerMethod()->DexInstructions().Insns() + handler_dex_pc_)); |
| } |
| context_->DoLongJump(); |
| UNREACHABLE(); |
| } |
| |
| void QuickExceptionHandler::DumpFramesWithType(Thread* self, bool details) { |
| StackVisitor::WalkStack( |
| [&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtMethod* method = stack_visitor->GetMethod(); |
| if (details) { |
| LOG(INFO) << "|> pc = " << std::hex << stack_visitor->GetCurrentQuickFramePc(); |
| LOG(INFO) << "|> addr = " << std::hex |
| << reinterpret_cast<uintptr_t>(stack_visitor->GetCurrentQuickFrame()); |
| if (stack_visitor->GetCurrentQuickFrame() != nullptr && method != nullptr) { |
| LOG(INFO) << "|> ret = " << std::hex << stack_visitor->GetReturnPc(); |
| } |
| } |
| if (method == nullptr) { |
| // Transition, do go on, we want to unwind over bridges, all the way. |
| if (details) { |
| LOG(INFO) << "N <transition>"; |
| } |
| return true; |
| } else if (method->IsRuntimeMethod()) { |
| if (details) { |
| LOG(INFO) << "R " << method->PrettyMethod(true); |
| } |
| return true; |
| } else { |
| bool is_shadow = stack_visitor->GetCurrentShadowFrame() != nullptr; |
| LOG(INFO) << (is_shadow ? "S" : "Q") |
| << ((!is_shadow && stack_visitor->IsInInlinedFrame()) ? "i" : " ") |
| << " " |
| << method->PrettyMethod(true); |
| return true; // Go on. |
| } |
| }, |
| self, |
| /* context= */ nullptr, |
| art::StackVisitor::StackWalkKind::kIncludeInlinedFrames); |
| } |
| |
| } // namespace art |