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89 lines
2.9 KiB
89 lines
2.9 KiB
/*
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* Copyright (C) 2015 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 "jni.h"
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#include <iostream>
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#include "art_method.h"
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#include "base/casts.h"
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#include "class_linker.h"
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#include "jit/jit.h"
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#include "linear_alloc.h"
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#include "nativehelper/ScopedUtfChars.h"
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#include "runtime.h"
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#include "scoped_thread_state_change-inl.h"
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#include "thread-current-inl.h"
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namespace art {
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namespace {
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class FindPointerAllocatorVisitor : public AllocatorVisitor {
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public:
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explicit FindPointerAllocatorVisitor(void* ptr) : is_found(false), ptr_(ptr) {}
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bool Visit(LinearAlloc* alloc)
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REQUIRES_SHARED(Locks::classlinker_classes_lock_, Locks::mutator_lock_) override {
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is_found = alloc->Contains(ptr_);
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return !is_found;
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}
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bool is_found;
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private:
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void* ptr_;
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};
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extern "C" JNIEXPORT jlong JNICALL Java_Main_getArtMethod(JNIEnv* env,
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jclass,
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jobject java_method) {
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ScopedObjectAccess soa(env);
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ArtMethod* method = ArtMethod::FromReflectedMethod(soa, java_method);
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return reinterpret_cast64<jlong>(method);
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_reuseArenaOfMethod(JNIEnv*,
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jclass,
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jlong art_method) {
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void* ptr = reinterpret_cast64<void*>(art_method);
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ReaderMutexLock mu(Thread::Current(), *Locks::mutator_lock_);
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ReaderMutexLock mu2(Thread::Current(), *Locks::classlinker_classes_lock_);
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// Check if the arena was already implicitly reused by boot classloader.
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if (Runtime::Current()->GetLinearAlloc()->Contains(ptr)) {
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return;
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}
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// Check if the arena was already implicitly reused by some other classloader.
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FindPointerAllocatorVisitor visitor(ptr);
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Runtime::Current()->GetClassLinker()->VisitAllocators(&visitor);
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if (visitor.is_found) {
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return;
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}
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// The arena was not reused yet. Do it explicitly.
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// Create a new allocation and use it to request new arenas until one of them is
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// a reused one that covers the art_method pointer.
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std::unique_ptr<LinearAlloc> alloc(Runtime::Current()->CreateLinearAlloc());
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do {
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// Ask for a byte - it's sufficient to get an arena.
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alloc->Alloc(Thread::Current(), 1);
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} while (!alloc->Contains(ptr));
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}
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} // namespace
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} // namespace art
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