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/*
* Copyright 2021 Code Intelligence GmbH
*
* 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.
*/
#pragma once
#include <jni.h>
#include <string>
namespace jazzer {
void DumpJvmStackTraces();
// JVM is a thin wrapper around JNI_CreateJavaVM and DestroyJavaVM. The JVM
// instance is created inside the constructor with some default JNI options
// + options which can be added to via command line flags.
class JVM {
private:
JavaVM *jvm_;
JNIEnv *env_;
public:
// Creates a JVM instance with default options + options that were provided as
// command line flags.
explicit JVM(const std::string &executable_path);
// Destroy the running JVM instance.
~JVM();
// Get the JNI environment for interaction with the running JVM instance.
JNIEnv &GetEnv() const;
jclass FindClass(std::string class_name) const;
jmethodID GetStaticMethodID(jclass class_id, const std::string &method_name,
const std::string &signature,
bool is_required = true) const;
jmethodID GetMethodID(jclass class_id, const std::string &method_name,
const std::string &signature) const;
jfieldID GetStaticFieldID(jclass jclass, const std::string &field_name,
const std::string &type) const;
};
// Adds convenience methods to convert a jvm exception to std::string
// using StringWriter and PrintWriter. The stack trace can be subjected to
// further processing, such as deduplication token computation and severity
// annotation.
class ExceptionPrinter {
private:
const JVM &jvm_;
jclass string_writer_class_;
jmethodID string_writer_constructor_;
jmethodID string_writer_to_string_method_;
jclass print_writer_class_;
jmethodID print_writer_constructor_;
jmethodID print_stack_trace_method_;
jclass exception_utils_;
jmethodID compute_dedup_token_method_;
jmethodID preprocess_throwable_method_;
protected:
explicit ExceptionPrinter(JVM &jvm);
// returns the current JVM exception stack trace as a string
std::string getStackTrace(jthrowable exception) const;
// augments the throwable with additional information such as severity markers
jthrowable preprocessException(jthrowable exception) const;
// returns a hash of the exception stack trace for deduplication purposes
jlong computeDedupToken(jthrowable exception) const;
};
} /* namespace jazzer */
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