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/*
* Copyright 2023 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.
*/
package com.code_intelligence.jazzer.utils;
import java.io.PrintStream;
/**
* Provides static functions that should be used for any kind of output (structured or unstructured)
* emitted by the fuzzer.
*
* <p>Output is printed to {@link System#err} and {@link System#out} until {@link
* Log#fixOutErr(PrintStream, PrintStream)} is called, which locks in the {@link PrintStream}s to be
* used from there on.
*/
public class Log {
// Don't use directly, always use getOut() and getErr() instead - when these fields haven't been
// set yet, we want to resolve them dynamically as System.out and System.err, which may change
// over the course of the fuzzer's lifetime.
private static PrintStream fixedOut;
private static PrintStream fixedErr;
/**
* The {@link PrintStream}s to use for all output from this call on.
*/
public static void fixOutErr(PrintStream out, PrintStream err) {
if (out == null) {
throw new IllegalArgumentException("out must not be null");
}
if (err == null) {
throw new IllegalArgumentException("err must not be null");
}
Log.fixedOut = out;
Log.fixedErr = err;
}
public static void println(String message) {
getErr().println(message);
}
public static void structuredOutput(String output) {
getOut().println(output);
}
public static void info(String message) {
println("INFO: ", message, null);
}
public static void warn(String message) {
warn(message, null);
}
public static void warn(String message, Throwable t) {
println("WARN: ", message, t);
}
public static void error(String message) {
error(message, null);
}
public static void error(Throwable t) {
error(null, t);
}
public static void error(String message, Throwable t) {
println("ERROR: ", message, t);
}
public static void finding(Throwable t) {
println("\n== Java Exception: ", null, t);
}
private static void println(String prefix, String message, Throwable t) {
PrintStream err = getErr();
err.print(prefix);
if (message != null) {
err.println(message + (t != null ? ":" : ""));
}
if (t != null) {
t.printStackTrace(err);
}
}
private static PrintStream getOut() {
return fixedOut != null ? fixedOut : System.out;
}
private static PrintStream getErr() {
return fixedErr != null ? fixedErr : System.err;
}
}
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