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/*
* Copyright (C) 2010-2013 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.bytecode;
import static lombok.bytecode.AsmUtil.*;
import java.util.concurrent.atomic.AtomicBoolean;
import lombok.core.DiagnosticsReceiver;
import lombok.core.PostCompilerTransformation;
import org.mangosdk.spi.ProviderFor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
@ProviderFor(PostCompilerTransformation.class)
public class SneakyThrowsRemover implements PostCompilerTransformation {
@Override public byte[] applyTransformations(byte[] original, String fileName, final DiagnosticsReceiver diagnostics) {
if (!new ClassFileMetaData(original).usesMethod("lombok/Lombok", "sneakyThrow")) return null;
byte[] fixedByteCode = fixJSRInlining(original);
ClassReader reader = new ClassReader(fixedByteCode);
ClassWriter writer = new ClassWriter(reader, 0);
final AtomicBoolean changesMade = new AtomicBoolean();
class SneakyThrowsRemoverVisitor extends MethodVisitor {
SneakyThrowsRemoverVisitor(MethodVisitor mv) {
super(Opcodes.ASM4, mv);
}
private boolean methodInsnQueued = false;
@Override public void visitMethodInsn(int opcode, String owner, String name, String desc) {
if (
opcode == Opcodes.INVOKESTATIC &&
"sneakyThrow".equals(name) &&
"lombok/Lombok".equals(owner) &&
"(Ljava/lang/Throwable;)Ljava/lang/RuntimeException;".equals(desc)) {
if (System.getProperty("lombok.debugAsmOnly", null) != null) {
super.visitMethodInsn(opcode, owner, name, desc); // DEBUG for issue 470!
} else {
methodInsnQueued = true;
}
} else {
super.visitMethodInsn(opcode, owner, name, desc);
}
}
private void handleQueue() {
if (!methodInsnQueued) return;
super.visitMethodInsn(Opcodes.INVOKESTATIC, "lombok/Lombok", "sneakyThrow", "(Ljava/lang/Throwable;)Ljava/lang/RuntimeException;");
methodInsnQueued = false;
diagnostics.addWarning("Proper usage is: throw lombok.Lombok.sneakyThrow(someException);. You did not 'throw' it. Because of this, the call to sneakyThrow " +
"remains in your classfile and you will need lombok.jar on the classpath at runtime.");
}
@Override public void visitInsn(int arg0) {
if (methodInsnQueued && arg0 == Opcodes.ATHROW) {
changesMade.set(true);
// As expected, the required ATHROW. We can now safely 'eat' the previous call.
methodInsnQueued = false;
}
handleQueue();
super.visitInsn(arg0);
}
@Override public void visitFrame(int arg0, int arg1, Object[] arg2, int arg3, Object[] arg4) {
handleQueue();
super.visitFrame(arg0, arg1, arg2, arg3, arg4);
}
@Override public void visitIincInsn(int arg0, int arg1) {
handleQueue();
super.visitIincInsn(arg0, arg1);
}
@Override public void visitFieldInsn(int arg0, String arg1, String arg2, String arg3) {
handleQueue();
super.visitFieldInsn(arg0, arg1, arg2, arg3);
}
@Override public void visitIntInsn(int arg0, int arg1) {
handleQueue();
super.visitIntInsn(arg0, arg1);
}
@Override public void visitEnd() {
handleQueue();
super.visitEnd();
}
@Override public void visitInvokeDynamicInsn(String arg0, String arg1, Handle arg2, Object... arg3) {
handleQueue();
super.visitInvokeDynamicInsn(arg0, arg1, arg2, arg3);
}
@Override public void visitLabel(Label arg0) {
handleQueue();
super.visitLabel(arg0);
}
@Override public void visitJumpInsn(int arg0, Label arg1) {
handleQueue();
super.visitJumpInsn(arg0, arg1);
}
@Override public void visitLdcInsn(Object arg0) {
handleQueue();
super.visitLdcInsn(arg0);
}
@Override public void visitLocalVariable(String arg0, String arg1, String arg2, Label arg3, Label arg4, int arg5) {
handleQueue();
super.visitLocalVariable(arg0, arg1, arg2, arg3, arg4, arg5);
}
@Override public void visitMaxs(int arg0, int arg1) {
handleQueue();
super.visitMaxs(arg0, arg1);
}
@Override public void visitLookupSwitchInsn(Label arg0, int[] arg1, Label[] arg2) {
handleQueue();
super.visitLookupSwitchInsn(arg0, arg1, arg2);
}
@Override public void visitMultiANewArrayInsn(String arg0, int arg1) {
handleQueue();
super.visitMultiANewArrayInsn(arg0, arg1);
}
@Override public void visitVarInsn(int arg0, int arg1) {
handleQueue();
super.visitVarInsn(arg0, arg1);
}
@Override public void visitTryCatchBlock(Label arg0, Label arg1, Label arg2, String arg3) {
handleQueue();
super.visitTryCatchBlock(arg0, arg1, arg2, arg3);
}
@Override public void visitTableSwitchInsn(int arg0, int arg1, Label arg2, Label... arg3) {
handleQueue();
super.visitTableSwitchInsn(arg0, arg1, arg2, arg3);
}
@Override public void visitTypeInsn(int arg0, String arg1) {
handleQueue();
super.visitTypeInsn(arg0, arg1);
}
}
reader.accept(new ClassVisitor(Opcodes.ASM4, writer) {
@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
return new SneakyThrowsRemoverVisitor(super.visitMethod(access, name, desc, signature, exceptions));
}
}, 0);
return changesMade.get() ? writer.toByteArray() : null;
}
}
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