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