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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 "mirror/art_method-inl.h"
#include "quick_exception_handler.h"
#include "handle_scope-inl.h"
#include "verifier/method_verifier.h"
namespace art {
bool CatchBlockStackVisitor::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 HandleTryItems(method);
}
}
}
bool CatchBlockStackVisitor::HandleTryItems(mirror::ArtMethod* method) {
uint32_t dex_pc = DexFile::kDexNoIndex;
if (!method->IsNative()) {
dex_pc = GetDexPc();
}
if (dex_pc != DexFile::kDexNoIndex) {
bool clear_exception = false;
bool exc_changed = false;
StackHandleScope<1> hs(Thread::Current());
Handle<mirror::Class> to_find(hs.NewHandle((*exception_)->GetClass()));
uint32_t found_dex_pc = method->FindCatchBlock(to_find, dex_pc, &clear_exception,
&exc_changed);
if (UNLIKELY(exc_changed)) {
DCHECK_EQ(DexFile::kDexNoIndex, found_dex_pc);
exception_->Assign(self_->GetException(nullptr)); // TODO: Throw location?
// There is a new context installed, delete it.
delete self_->GetLongJumpContext();
}
exception_handler_->SetClearException(clear_exception);
if (found_dex_pc != DexFile::kDexNoIndex) {
exception_handler_->SetHandlerDexPc(found_dex_pc);
exception_handler_->SetHandlerQuickFramePc(method->ToNativePc(found_dex_pc));
exception_handler_->SetHandlerQuickFrame(GetCurrentQuickFrame());
return false; // End stack walk.
}
}
return true; // Continue stack walk.
}
} // namespace art
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