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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 "deoptimize_stack_visitor.h"
#include "mirror/art_method-inl.h"
#include "object_utils.h"
#include "quick_exception_handler.h"
#include "handle_scope-inl.h"
#include "verifier/method_verifier.h"
namespace art {
bool DeoptimizeStackVisitor::VisitFrame() {
exception_handler_->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.
exception_handler_->SetHandlerQuickFramePc(GetCurrentQuickFramePc());
exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
return false; // End stack walk.
} else if (method->IsRuntimeMethod()) {
// Ignore callee save method.
DCHECK(method->IsCalleeSaveMethod());
return true;
} else {
return HandleDeoptimization(method);
}
}
bool DeoptimizeStackVisitor::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);
StackHandleScope<2> hs(self_);
Handle<mirror::DexCache> dex_cache(hs.NewHandle(mh.GetDexCache()));
Handle<mirror::ClassLoader> class_loader(hs.NewHandle(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 {
self_->SetDeoptimizationShadowFrame(new_frame);
}
prev_shadow_frame_ = new_frame;
return true;
}
} // namespace art
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