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/*******************************************************************************
* Copyright (c) 2009, 2018 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.analysis.filter;
import java.util.ArrayList;
import java.util.List;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.TableSwitchInsnNode;
/**
* Filters branches that Kotlin compiler generates for coroutines.
*/
public final class KotlinCoroutineFilter implements IFilter {
static boolean isLastArgumentContinuation(final MethodNode methodNode) {
final Type methodType = Type.getMethodType(methodNode.desc);
final int lastArgument = methodType.getArgumentTypes().length - 1;
return lastArgument >= 0 && "kotlin.coroutines.Continuation".equals(
methodType.getArgumentTypes()[lastArgument].getClassName());
}
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if (!KotlinGeneratedFilter.isKotlinClass(context)) {
return;
}
if (!"invokeSuspend".equals(methodNode.name)) {
return;
}
new Matcher().match(methodNode, output);
}
private static class Matcher extends AbstractMatcher {
private void match(final MethodNode methodNode,
final IFilterOutput output) {
cursor = methodNode.instructions.getFirst();
nextIsInvokeStatic("kotlin/coroutines/intrinsics/IntrinsicsKt",
"getCOROUTINE_SUSPENDED");
nextIsVar(Opcodes.ASTORE, "COROUTINE_SUSPENDED");
nextIsVar(Opcodes.ALOAD, "this");
nextIs(Opcodes.GETFIELD);
nextIs(Opcodes.TABLESWITCH);
if (cursor == null) {
return;
}
final TableSwitchInsnNode s = (TableSwitchInsnNode) cursor;
final List<AbstractInsnNode> ignore = new ArrayList<AbstractInsnNode>(
s.labels.size() * 2);
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.DUP);
nextIsType(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
nextIs(Opcodes.IFEQ);
nextIsType(Opcodes.CHECKCAST, "kotlin/Result$Failure");
nextIs(Opcodes.GETFIELD);
nextIs(Opcodes.ATHROW);
nextIs(Opcodes.POP);
if (cursor == null) {
return;
}
ignore.add(s);
ignore.add(cursor);
int suspensionPoint = 1;
for (AbstractInsnNode i = cursor; i != null
&& suspensionPoint < s.labels.size(); i = i.getNext()) {
cursor = i;
nextIsVar(Opcodes.ALOAD, "COROUTINE_SUSPENDED");
nextIs(Opcodes.IF_ACMPNE);
if (cursor == null) {
continue;
}
final AbstractInsnNode continuationAfterLoadedResult = skipNonOpcodes(
(((JumpInsnNode) cursor)).label);
nextIsVar(Opcodes.ALOAD, "COROUTINE_SUSPENDED");
nextIs(Opcodes.ARETURN);
if (cursor == null
|| skipNonOpcodes(cursor.getNext()) != skipNonOpcodes(
s.labels.get(suspensionPoint))) {
continue;
}
for (AbstractInsnNode j = i; j != null; j = j.getNext()) {
cursor = j;
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.DUP);
nextIsType(Opcodes.INSTANCEOF, "kotlin/Result$Failure");
nextIs(Opcodes.IFEQ);
nextIsType(Opcodes.CHECKCAST, "kotlin/Result$Failure");
nextIs(Opcodes.GETFIELD);
nextIs(Opcodes.ATHROW);
nextIs(Opcodes.POP);
nextIs(Opcodes.ALOAD);
if (cursor != null && skipNonOpcodes(cursor
.getNext()) == continuationAfterLoadedResult) {
ignore.add(i);
ignore.add(cursor);
suspensionPoint++;
break;
}
}
}
cursor = s.dflt;
nextIsType(Opcodes.NEW, "java/lang/IllegalStateException");
nextIs(Opcodes.DUP);
nextIs(Opcodes.LDC);
if (!((LdcInsnNode) cursor).cst.equals(
"call to 'resume' before 'invoke' with coroutine")) {
return;
}
nextIsInvokeSuper("java/lang/IllegalStateException",
"(Ljava/lang/String;)V");
nextIs(Opcodes.ATHROW);
if (cursor == null) {
return;
}
output.ignore(s.dflt, cursor);
for (int i = 0; i < ignore.size(); i += 2) {
output.ignore(ignore.get(i), ignore.get(i + 1));
}
}
}
}
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