GrammarFuzzer.java

// Copyright 2022 Google LLC
//
// 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.
//
////////////////////////////////////////////////////////////////////////////////

importcom.code_intelligence.jazzer.api.FuzzedDataProvider;

importorg.antlr.v4.runtime.CharStreams;
importorg.antlr.v4.runtime.CommonTokenStream;
importorg.antlr.v4.runtime.LexerInterpreter;
importorg.antlr.v4.runtime.ParserInterpreter;
importorg.antlr.v4.runtime.RecognitionException;
importorg.antlr.v4.tool.LexerGrammar;
importorg.antlr.v4.tool.Grammar;

publicclassGrammarFuzzer {
publicstaticvoidfuzzerTestOneInput(FuzzedDataProviderdata) {

LexerGrammarlg;
Grammarg;
try{ 
lg = newLexerGrammar(data.consumeString(1000));
g = newGrammar(data.consumeString(1000));
 }
catch (org.antlr.runtime.RecognitionException | UnsupportedOperationExceptione){
return;
 }

LexerInterpreterlexEngine = lg.createLexerInterpreter(CharStreams.fromString(data.consumeRemainingAsString()));
CommonTokenStreamtokens = newCommonTokenStream(lexEngine);
ParserInterpreterparser = g.createParserInterpreter(tokens);
 }
}