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heaphistogramaction.h
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heaphistogramaction.h
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/*
* Copyright (c) 2015 the original author or authors.
*
* 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.
*/
#ifndef heaphistogramaction_h
#define heaphistogramaction_h
#include "action.h"
#include "heapstats.h"
#include <jni.h>
#include <jvmti.h>
#include <unordered_map>
using namespace std;
class HeapHistogramAction: public Action
{
public:
HeapHistogramAction(jvmtiEnv *jvmti, HeapStatsFactory* factory);
virtual ~HeapHistogramAction();
void act(JNIEnv* jniEnv, jint resourceExhaustionFlags);
jint heapReferenceCallback(jvmtiHeapReferenceKind reference_kind,
const jvmtiHeapReferenceInfo* reference_info,
jlong class_tag,
jlong referrer_class_tag,
jlong size,
jlong* tag_ptr,
jlong* referrer_tag_ptr,
jint length);
private:
jvmtiEnv* jvmti;
HeapStatsFactory* heapStatsFactory;
HeapStats* heapStats;
// Map from class tag to class signature
unordered_map<jlong, const char*> taggedClass;
jlong nextClassTag;
void printHistogram(JNIEnv* jniEnv, std::ostream *outputStream);
void tagLoadedClasses(JNIEnv* jniEnv);
void tagLoadedClass(JNIEnv* jniEnv, jclass& cls);
};
#endif // heaphistogramaction_h