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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.turbine.bytecode;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;
import com.google.common.jimfs.Configuration;
import com.google.common.jimfs.Jimfs;
import com.google.turbine.testing.AsmUtils;
import com.sun.source.util.JavacTask;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.objectweb.asm.ModuleVisitor;
import org.objectweb.asm.Opcodes;
@RunWith(JUnit4.class)
public class ClassWriterTest {
// a simple end-to-end test for ClassReader and ClassWriter
@Test
public void roundTrip() throws Exception {
FileSystem fs = Jimfs.newFileSystem(Configuration.unix());
Path path = fs.getPath("test/Test.java");
Files.createDirectories(path.getParent());
Files.write(
path,
ImmutableList.of(
"package test;",
"import java.util.List;",
"class Test<T extends String> implements Runnable {", //
" public void run() {}",
" public <T extends Exception> void f() throws T {}",
" public static int X;",
" class Inner {}",
"}"),
UTF_8);
Path out = fs.getPath("out");
Files.createDirectories(out);
JavacFileManager fileManager = new JavacFileManager(new Context(), false, UTF_8);
fileManager.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, ImmutableList.of(out));
DiagnosticCollector<JavaFileObject> collector = new DiagnosticCollector<>();
JavacTask task =
JavacTool.create()
.getTask(
new PrintWriter(
new BufferedWriter(new OutputStreamWriter(System.err, UTF_8)), true),
fileManager,
collector,
ImmutableList.of("-source", "8", "-target", "8"),
/* classes= */ null,
fileManager.getJavaFileObjects(path));
assertWithMessage(collector.getDiagnostics().toString()).that(task.call()).isTrue();
byte[] original = Files.readAllBytes(out.resolve("test/Test.class"));
byte[] actual = ClassWriter.writeClass(ClassReader.read(null, original));
assertThat(AsmUtils.textify(original, /* skipDebug= */ true))
.isEqualTo(AsmUtils.textify(actual, /* skipDebug= */ true));
}
// Test that >Short.MAX_VALUE constants round-trip through the constant pool.
// Regression test for signed-ness issues.
@Test
public void manyManyConstants() {
ConstantPool pool = new ConstantPool();
Map<Integer, String> entries = new LinkedHashMap<>();
int i = 0;
while (pool.nextEntry < 0xffff) {
String value = "c" + i++;
entries.put(pool.classInfo(value), value);
}
ByteArrayDataOutput bytes = ByteStreams.newDataOutput();
ClassWriter.writeConstantPool(pool, bytes);
ConstantPoolReader reader =
ConstantPoolReader.readConstantPool(new ByteReader(bytes.toByteArray(), 0));
for (Map.Entry<Integer, String> entry : entries.entrySet()) {
assertThat(reader.classInfo(entry.getKey())).isEqualTo(entry.getValue());
}
}
@Test
public void module() throws Exception {
org.objectweb.asm.ClassWriter cw = new org.objectweb.asm.ClassWriter(0);
cw.visit(53, /* access= */ 53, "module-info", null, null, null);
ModuleVisitor mv = cw.visitModule("mod", Opcodes.ACC_OPEN, "mod-ver");
mv.visitRequire("r1", Opcodes.ACC_TRANSITIVE, "r1-ver");
mv.visitRequire("r2", Opcodes.ACC_STATIC_PHASE, "r2-ver");
mv.visitRequire("r3", Opcodes.ACC_STATIC_PHASE | Opcodes.ACC_TRANSITIVE, "r3-ver");
mv.visitExport("e1", Opcodes.ACC_SYNTHETIC, "e1m1", "e1m2", "e1m3");
mv.visitExport("e2", Opcodes.ACC_MANDATED, "e2m1", "e2m2");
mv.visitExport("e3", /* access= */ 0, "e3m1");
mv.visitOpen("o1", Opcodes.ACC_SYNTHETIC, "o1m1", "o1m2", "o1m3");
mv.visitOpen("o2", Opcodes.ACC_MANDATED, "o2m1", "o2m2");
mv.visitOpen("o3", /* access= */ 0, "o3m1");
mv.visitUse("u1");
mv.visitUse("u2");
mv.visitUse("u3");
mv.visitUse("u4");
mv.visitProvide("p1", "p1i1", "p1i2");
mv.visitProvide("p2", "p2i1", "p2i2", "p2i3");
byte[] inputBytes = cw.toByteArray();
byte[] outputBytes = ClassWriter.writeClass(ClassReader.read("module-info", inputBytes));
assertThat(AsmUtils.textify(inputBytes, /* skipDebug= */ true))
.isEqualTo(AsmUtils.textify(outputBytes, /* skipDebug= */ true));
// test a round trip
outputBytes = ClassWriter.writeClass(ClassReader.read("module-info", outputBytes));
assertThat(AsmUtils.textify(inputBytes, /* skipDebug= */ true))
.isEqualTo(AsmUtils.textify(outputBytes, /* skipDebug= */ true));
}
}
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