359 lines
14 KiB
C++
359 lines
14 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "quick_exception_handler.h"
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#include "arch/context.h"
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#include "dex_instruction.h"
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#include "entrypoints/entrypoint_utils.h"
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#include "handle_scope-inl.h"
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#include "mirror/art_method-inl.h"
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#include "mirror/class-inl.h"
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#include "mirror/class_loader.h"
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#include "mirror/throwable.h"
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#include "verifier/method_verifier.h"
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namespace art {
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static constexpr bool kDebugExceptionDelivery = false;
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static constexpr size_t kInvalidFrameDepth = 0xffffffff;
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QuickExceptionHandler::QuickExceptionHandler(Thread* self, bool is_deoptimization)
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: self_(self), context_(self->GetLongJumpContext()), is_deoptimization_(is_deoptimization),
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method_tracing_active_(is_deoptimization ||
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Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()),
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handler_quick_frame_(nullptr), handler_quick_frame_pc_(0), handler_method_(nullptr),
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handler_dex_pc_(0), clear_exception_(false), handler_frame_depth_(kInvalidFrameDepth) {
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}
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// Finds catch handler or prepares for deoptimization.
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class CatchBlockStackVisitor FINAL : public StackVisitor {
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public:
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CatchBlockStackVisitor(Thread* self, Context* context, Handle<mirror::Throwable>* exception,
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QuickExceptionHandler* exception_handler)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
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: StackVisitor(self, context), self_(self), exception_(exception),
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exception_handler_(exception_handler) {
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}
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bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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mirror::ArtMethod* method = GetMethod();
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exception_handler_->SetHandlerFrameDepth(GetFrameDepth());
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if (method == nullptr) {
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// This is the upcall, we remember the frame and last pc so that we may long jump to them.
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exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc());
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exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
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uint32_t next_dex_pc;
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mirror::ArtMethod* next_art_method;
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bool has_next = GetNextMethodAndDexPc(&next_art_method, &next_dex_pc);
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// Report the method that did the down call as the handler.
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exception_handler_->SetHandlerDexPc(next_dex_pc);
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exception_handler_->SetHandlerMethod(next_art_method);
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if (!has_next) {
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// No next method? Check exception handler is set up for the unhandled exception handler
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// case.
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DCHECK_EQ(0U, exception_handler_->GetHandlerDexPc());
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DCHECK(nullptr == exception_handler_->GetHandlerMethod());
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}
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return false; // End stack walk.
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}
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if (method->IsRuntimeMethod()) {
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// Ignore callee save method.
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DCHECK(method->IsCalleeSaveMethod());
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return true;
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}
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StackHandleScope<1> hs(self_);
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return HandleTryItems(hs.NewHandle(method));
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}
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private:
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bool HandleTryItems(Handle<mirror::ArtMethod> method)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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uint32_t dex_pc = DexFile::kDexNoIndex;
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if (!method->IsNative()) {
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dex_pc = GetDexPc();
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}
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if (dex_pc != DexFile::kDexNoIndex) {
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bool clear_exception = false;
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StackHandleScope<1> hs(Thread::Current());
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Handle<mirror::Class> to_find(hs.NewHandle((*exception_)->GetClass()));
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uint32_t found_dex_pc = mirror::ArtMethod::FindCatchBlock(method, to_find, dex_pc,
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&clear_exception);
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exception_handler_->SetClearException(clear_exception);
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if (found_dex_pc != DexFile::kDexNoIndex) {
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exception_handler_->SetHandlerMethod(method.Get());
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exception_handler_->SetHandlerDexPc(found_dex_pc);
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exception_handler_->SetHandlerQuickFramePc(method->ToNativePc(found_dex_pc));
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exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
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return false; // End stack walk.
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}
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}
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return true; // Continue stack walk.
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}
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Thread* const self_;
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// The exception we're looking for the catch block of.
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Handle<mirror::Throwable>* exception_;
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// The quick exception handler we're visiting for.
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QuickExceptionHandler* const exception_handler_;
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DISALLOW_COPY_AND_ASSIGN(CatchBlockStackVisitor);
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};
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void QuickExceptionHandler::FindCatch(const ThrowLocation& throw_location,
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mirror::Throwable* exception,
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bool is_exception_reported) {
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DCHECK(!is_deoptimization_);
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if (kDebugExceptionDelivery) {
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mirror::String* msg = exception->GetDetailMessage();
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std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : "");
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self_->DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception)
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<< ": " << str_msg << "\n");
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}
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StackHandleScope<1> hs(self_);
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Handle<mirror::Throwable> exception_ref(hs.NewHandle(exception));
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// Walk the stack to find catch handler or prepare for deoptimization.
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CatchBlockStackVisitor visitor(self_, context_, &exception_ref, this);
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visitor.WalkStack(true);
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if (kDebugExceptionDelivery) {
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if (handler_quick_frame_->AsMirrorPtr() == nullptr) {
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LOG(INFO) << "Handler is upcall";
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}
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if (handler_method_ != nullptr) {
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const DexFile& dex_file = *handler_method_->GetDeclaringClass()->GetDexCache()->GetDexFile();
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int line_number = dex_file.GetLineNumFromPC(handler_method_, handler_dex_pc_);
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LOG(INFO) << "Handler: " << PrettyMethod(handler_method_) << " (line: " << line_number << ")";
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}
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}
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if (clear_exception_) {
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// Exception was cleared as part of delivery.
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DCHECK(!self_->IsExceptionPending());
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} else {
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// Put exception back in root set with clear throw location.
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self_->SetException(ThrowLocation(), exception_ref.Get());
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self_->SetExceptionReportedToInstrumentation(is_exception_reported);
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}
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// The debugger may suspend this thread and walk its stack. Let's do this before popping
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// instrumentation frames.
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if (!is_exception_reported) {
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instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation();
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instrumentation->ExceptionCaughtEvent(self_, throw_location, handler_method_, handler_dex_pc_,
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exception_ref.Get());
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// We're not catching this exception but let's remind we already reported the exception above
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// to avoid reporting it twice.
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self_->SetExceptionReportedToInstrumentation(true);
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}
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bool caught_exception = (handler_method_ != nullptr && handler_dex_pc_ != DexFile::kDexNoIndex);
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if (caught_exception) {
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// We're catching this exception so we finish reporting it. We do it here to avoid doing it
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// in the compiled code.
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self_->SetExceptionReportedToInstrumentation(false);
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}
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}
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// Prepares deoptimization.
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class DeoptimizeStackVisitor FINAL : public StackVisitor {
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public:
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DeoptimizeStackVisitor(Thread* self, Context* context, QuickExceptionHandler* exception_handler)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
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: StackVisitor(self, context), self_(self), exception_handler_(exception_handler),
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prev_shadow_frame_(nullptr) {
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CHECK(!self_->HasDeoptimizationShadowFrame());
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}
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bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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exception_handler_->SetHandlerFrameDepth(GetFrameDepth());
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mirror::ArtMethod* method = GetMethod();
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if (method == nullptr) {
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// This is the upcall, we remember the frame and last pc so that we may long jump to them.
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exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc());
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exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
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return false; // End stack walk.
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} else if (method->IsRuntimeMethod()) {
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// Ignore callee save method.
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DCHECK(method->IsCalleeSaveMethod());
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return true;
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} else {
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return HandleDeoptimization(method);
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}
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}
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private:
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static VRegKind GetVRegKind(uint16_t reg, const std::vector<int32_t>& kinds) {
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return static_cast<VRegKind>(kinds.at(reg * 2));
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}
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bool HandleDeoptimization(mirror::ArtMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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const DexFile::CodeItem* code_item = m->GetCodeItem();
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CHECK(code_item != nullptr);
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uint16_t num_regs = code_item->registers_size_;
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uint32_t dex_pc = GetDexPc();
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StackHandleScope<3> hs(self_); // Dex cache, class loader and method.
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mirror::Class* declaring_class = m->GetDeclaringClass();
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Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(declaring_class->GetDexCache()));
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Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(declaring_class->GetClassLoader()));
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Handle<mirror::ArtMethod> h_method(hs.NewHandle(m));
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verifier::MethodVerifier verifier(h_dex_cache->GetDexFile(), &h_dex_cache, &h_class_loader,
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&m->GetClassDef(), code_item, m->GetDexMethodIndex(), m,
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m->GetAccessFlags(), true, true, true);
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bool verifier_success = verifier.Verify();
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CHECK(verifier_success) << PrettyMethod(h_method.Get());
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ShadowFrame* new_frame = ShadowFrame::Create(num_regs, nullptr, h_method.Get(), dex_pc);
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self_->SetShadowFrameUnderConstruction(new_frame);
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const std::vector<int32_t> kinds(verifier.DescribeVRegs(dex_pc));
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for (uint16_t reg = 0; reg < num_regs; ++reg) {
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VRegKind kind = GetVRegKind(reg, kinds);
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switch (kind) {
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case kUndefined:
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new_frame->SetVReg(reg, 0xEBADDE09);
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break;
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case kConstant:
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new_frame->SetVReg(reg, kinds.at((reg * 2) + 1));
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break;
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case kReferenceVReg:
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new_frame->SetVRegReference(reg,
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reinterpret_cast<mirror::Object*>(GetVReg(h_method.Get(),
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reg, kind)));
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break;
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case kLongLoVReg:
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if (GetVRegKind(reg + 1, kinds) == kLongHiVReg) {
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// Treat it as a "long" register pair.
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new_frame->SetVRegLong(reg, GetVRegPair(h_method.Get(), reg, kLongLoVReg, kLongHiVReg));
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} else {
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new_frame->SetVReg(reg, GetVReg(h_method.Get(), reg, kind));
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}
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break;
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case kLongHiVReg:
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if (GetVRegKind(reg - 1, kinds) == kLongLoVReg) {
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// Nothing to do: we treated it as a "long" register pair.
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} else {
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new_frame->SetVReg(reg, GetVReg(h_method.Get(), reg, kind));
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}
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break;
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case kDoubleLoVReg:
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if (GetVRegKind(reg + 1, kinds) == kDoubleHiVReg) {
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// Treat it as a "double" register pair.
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new_frame->SetVRegLong(reg, GetVRegPair(h_method.Get(), reg, kDoubleLoVReg, kDoubleHiVReg));
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} else {
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new_frame->SetVReg(reg, GetVReg(h_method.Get(), reg, kind));
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}
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break;
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case kDoubleHiVReg:
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if (GetVRegKind(reg - 1, kinds) == kDoubleLoVReg) {
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// Nothing to do: we treated it as a "double" register pair.
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} else {
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new_frame->SetVReg(reg, GetVReg(h_method.Get(), reg, kind));
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}
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break;
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default:
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new_frame->SetVReg(reg, GetVReg(h_method.Get(), reg, kind));
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break;
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}
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}
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if (prev_shadow_frame_ != nullptr) {
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prev_shadow_frame_->SetLink(new_frame);
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} else {
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self_->SetDeoptimizationShadowFrame(new_frame);
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}
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self_->ClearShadowFrameUnderConstruction();
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prev_shadow_frame_ = new_frame;
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return true;
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}
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Thread* const self_;
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QuickExceptionHandler* const exception_handler_;
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ShadowFrame* prev_shadow_frame_;
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DISALLOW_COPY_AND_ASSIGN(DeoptimizeStackVisitor);
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};
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void QuickExceptionHandler::DeoptimizeStack() {
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DCHECK(is_deoptimization_);
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if (kDebugExceptionDelivery) {
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self_->DumpStack(LOG(INFO) << "Deoptimizing: ");
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}
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DeoptimizeStackVisitor visitor(self_, context_, this);
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visitor.WalkStack(true);
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// Restore deoptimization exception
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self_->SetException(ThrowLocation(), Thread::GetDeoptimizationException());
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}
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// Unwinds all instrumentation stack frame prior to catch handler or upcall.
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class InstrumentationStackVisitor : public StackVisitor {
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public:
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InstrumentationStackVisitor(Thread* self, bool is_deoptimization, size_t frame_depth)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
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: StackVisitor(self, nullptr),
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self_(self), frame_depth_(frame_depth),
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instrumentation_frames_to_pop_(0) {
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CHECK_NE(frame_depth_, kInvalidFrameDepth);
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}
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bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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size_t current_frame_depth = GetFrameDepth();
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if (current_frame_depth < frame_depth_) {
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CHECK(GetMethod() != nullptr);
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if (UNLIKELY(GetQuickInstrumentationExitPc() == GetReturnPc())) {
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++instrumentation_frames_to_pop_;
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}
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return true;
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} else {
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// We reached the frame of the catch handler or the upcall.
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return false;
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}
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}
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size_t GetInstrumentationFramesToPop() const {
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return instrumentation_frames_to_pop_;
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}
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private:
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Thread* const self_;
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const size_t frame_depth_;
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size_t instrumentation_frames_to_pop_;
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DISALLOW_COPY_AND_ASSIGN(InstrumentationStackVisitor);
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};
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void QuickExceptionHandler::UpdateInstrumentationStack() {
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if (method_tracing_active_) {
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InstrumentationStackVisitor visitor(self_, is_deoptimization_, handler_frame_depth_);
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visitor.WalkStack(true);
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size_t instrumentation_frames_to_pop = visitor.GetInstrumentationFramesToPop();
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instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation();
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for (size_t i = 0; i < instrumentation_frames_to_pop; ++i) {
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instrumentation->PopMethodForUnwind(self_, is_deoptimization_);
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}
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}
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}
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void QuickExceptionHandler::DoLongJump() {
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// Place context back on thread so it will be available when we continue.
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self_->ReleaseLongJumpContext(context_);
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context_->SetSP(reinterpret_cast<uintptr_t>(handler_quick_frame_));
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CHECK_NE(handler_quick_frame_pc_, 0u);
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context_->SetPC(handler_quick_frame_pc_);
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context_->SmashCallerSaves();
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context_->DoLongJump();
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}
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} // namespace art
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