/*
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* Copyright (C) 2018 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 "arch/context.h"
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#include "art_method-inl.h"
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#include "jni.h"
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#include "oat_quick_method_header.h"
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#include "scoped_thread_state_change-inl.h"
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#include "stack.h"
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#include "thread.h"
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namespace art {
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namespace {
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// Visit a proxy method Quick frame at a given depth.
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class GetProxyQuickFrameVisitor final : public StackVisitor {
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public:
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GetProxyQuickFrameVisitor(art::Thread* target, art::Context* ctx, size_t frame_depth)
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REQUIRES_SHARED(art::Locks::mutator_lock_)
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: art::StackVisitor(target, ctx, art::StackVisitor::StackWalkKind::kIncludeInlinedFrames),
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cur_depth_(0u),
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frame_depth_(frame_depth),
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quick_frame_(nullptr) {}
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bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) {
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if (GetMethod()->IsRuntimeMethod()) {
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return true;
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}
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if (cur_depth_ == frame_depth_) {
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// Found frame.
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ShadowFrame* shadow_frame = GetCurrentShadowFrame();
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if (shadow_frame != nullptr) {
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// Nothing to do.
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} else {
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VisitQuickFrameAtSearchedDepth();
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}
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return false;
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} else {
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++cur_depth_;
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return true;
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}
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}
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void VisitQuickFrameAtSearchedDepth() REQUIRES_SHARED(Locks::mutator_lock_) {
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quick_frame_ = GetCurrentQuickFrame();
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CHECK(quick_frame_ != nullptr);
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ArtMethod* method = *quick_frame_;
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CHECK(method != nullptr);
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CHECK(method->IsProxyMethod()) << method->PrettyMethod();
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}
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// Return the found Quick frame.
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ArtMethod** GetQuickFrame() {
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return quick_frame_;
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}
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private:
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// The depth of the currently visited frame.
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size_t cur_depth_;
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// The depth of the currently searched frame.
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size_t frame_depth_;
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// The quick frame, if found.
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ArtMethod** quick_frame_;
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// Method name
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DISALLOW_COPY_AND_ASSIGN(GetProxyQuickFrameVisitor);
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};
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extern "C" StackReference<mirror::Object>* artQuickGetProxyReferenceArgumentAt(size_t arg_pos,
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ArtMethod** sp)
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REQUIRES_SHARED(Locks::mutator_lock_);
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jobject GetProxyReferenceArgument(size_t arg_pos, size_t proxy_method_frame_depth) {
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Thread* self = Thread::Current();
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ScopedObjectAccess soa(self);
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std::unique_ptr<Context> context(Context::Create());
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GetProxyQuickFrameVisitor visitor(self, context.get(), proxy_method_frame_depth);
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visitor.WalkStack();
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ArtMethod** quick_frame = visitor.GetQuickFrame();
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CHECK(quick_frame != nullptr);
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// Find reference argument in frame.
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StackReference<mirror::Object>* ref_arg =
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artQuickGetProxyReferenceArgumentAt(arg_pos, quick_frame);
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CHECK(ref_arg != nullptr);
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art::ObjPtr<mirror::Object> obj = ref_arg->AsMirrorPtr();
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return obj.IsNull() ? nullptr : soa.AddLocalReference<jobject>(obj);
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}
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extern "C" JNIEXPORT jobject JNICALL Java_TestInvocationHandler_getArgument(
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JNIEnv* env ATTRIBUTE_UNUSED, jobject thiz ATTRIBUTE_UNUSED, int arg_pos, int frame_depth) {
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return GetProxyReferenceArgument(arg_pos, frame_depth);
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}
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} // namespace
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} // namespace art
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