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/*
* 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 "catch_block_stack_visitor.h"
#include "dex_instruction.h"
#include "catch_finder.h"
#include "sirt_ref.h"
#include "verifier/method_verifier.h"
namespace art {
bool CatchBlockStackVisitor::VisitFrame() {
catch_finder_->SetHandlerFrameId(GetFrameId());
mirror::ArtMethod* method = GetMethod();
if (method == nullptr) {
// This is the upcall, we remember the frame and last pc so that we may long jump to them.
catch_finder_->SetHandlerQuickFramePc(GetCurrentQuickFramePc());
catch_finder_->SetHandlerQuickFrame(GetCurrentQuickFrame());
return false; // End stack walk.
} else {
if (method->IsRuntimeMethod()) {
// Ignore callee save method.
DCHECK(method->IsCalleeSaveMethod());
return true;
} else if (is_deoptimization_) {
return HandleDeoptimization(method);
} else {
return HandleTryItems(method);
}
}
}
bool CatchBlockStackVisitor::HandleTryItems(mirror::ArtMethod* method) {
uint32_t dex_pc = DexFile::kDexNoIndex;
if (method->IsNative()) {
++native_method_count_;
} else {
dex_pc = GetDexPc();
}
if (dex_pc != DexFile::kDexNoIndex) {
bool clear_exception = false;
SirtRef<mirror::Class> sirt_method_to_find(Thread::Current(), to_find_);
uint32_t found_dex_pc = method->FindCatchBlock(sirt_method_to_find, dex_pc, &clear_exception);
to_find_ = sirt_method_to_find.get();
catch_finder_->SetClearException(clear_exception);
if (found_dex_pc != DexFile::kDexNoIndex) {
catch_finder_->SetHandlerDexPc(found_dex_pc);
catch_finder_->SetHandlerQuickFramePc(method->ToNativePc(found_dex_pc));
catch_finder_->SetHandlerQuickFrame(GetCurrentQuickFrame());
return false; // End stack walk.
}
}
return true; // Continue stack walk.
}
bool CatchBlockStackVisitor::HandleDeoptimization(mirror::ArtMethod* m) {
MethodHelper mh(m);
const DexFile::CodeItem* code_item = mh.GetCodeItem();
CHECK(code_item != nullptr);
uint16_t num_regs = code_item->registers_size_;
uint32_t dex_pc = GetDexPc();
const Instruction* inst = Instruction::At(code_item->insns_ + dex_pc);
uint32_t new_dex_pc = dex_pc + inst->SizeInCodeUnits();
ShadowFrame* new_frame = ShadowFrame::Create(num_regs, nullptr, m, new_dex_pc);
SirtRef<mirror::DexCache> dex_cache(self_, mh.GetDexCache());
SirtRef<mirror::ClassLoader> class_loader(self_, mh.GetClassLoader());
verifier::MethodVerifier verifier(&mh.GetDexFile(), &dex_cache, &class_loader,
&mh.GetClassDef(), code_item, m->GetDexMethodIndex(), m,
m->GetAccessFlags(), false, true);
verifier.Verify();
std::vector<int32_t> kinds = verifier.DescribeVRegs(dex_pc);
for (uint16_t reg = 0; reg < num_regs; ++reg) {
VRegKind kind = static_cast<VRegKind>(kinds.at(reg * 2));
switch (kind) {
case kUndefined:
new_frame->SetVReg(reg, 0xEBADDE09);
break;
case kConstant:
new_frame->SetVReg(reg, kinds.at((reg * 2) + 1));
break;
case kReferenceVReg:
new_frame->SetVRegReference(reg,
reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kind)));
break;
default:
new_frame->SetVReg(reg, GetVReg(m, reg, kind));
break;
}
}
if (prev_shadow_frame_ != nullptr) {
prev_shadow_frame_->SetLink(new_frame);
} else {
catch_finder_->SetTopShadowFrame(new_frame);
}
prev_shadow_frame_ = new_frame;
return true;
}
} // namespace art
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