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/*******************************************************************************
* Copyright (c) 2009, 2023 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.flow;
import static org.junit.Assert.assertEquals;
import org.jacoco.core.instr.MethodRecorder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.AnalyzerAdapter;
/**
* Unit tests for {@link FrameSnapshot}.
*/
public class FrameSnapshotTest {
private AnalyzerAdapter analyzer;
private IFrame frame;
private MethodRecorder expected;
private MethodVisitor expectedVisitor;
@Before
public void setup() {
analyzer = new AnalyzerAdapter("Foo", 0, "doit", "()V", null);
expected = new MethodRecorder();
expectedVisitor = expected.getVisitor();
}
@After
public void teardown() {
MethodRecorder actual = new MethodRecorder();
frame.accept(actual.getVisitor());
assertEquals(expected, actual);
}
@Test
public void should_not_capture_frame_when_no_analyzer_is_given() {
frame = FrameSnapshot.create(null, 0);
}
@Test
public void should_not_capture_frame_when_no_frame_is_defined() {
analyzer.visitJumpInsn(Opcodes.GOTO, new Label());
frame = FrameSnapshot.create(analyzer, 0);
}
@Test
public void should_capture_frame_when_frame_is_defined() {
analyzer.visitInsn(Opcodes.FCONST_0);
analyzer.visitVarInsn(Opcodes.FSTORE, 1);
analyzer.visitInsn(Opcodes.ICONST_0);
frame = FrameSnapshot.create(analyzer, 0);
expectedVisitor.visitFrame(Opcodes.F_FULL, 2, arr("Foo", Opcodes.FLOAT),
1, arr(Opcodes.INTEGER));
}
@Test
public void should_combine_slots_when_doube_or_long_types_are_given() {
analyzer.visitInsn(Opcodes.DCONST_0);
analyzer.visitVarInsn(Opcodes.DSTORE, 1);
analyzer.visitInsn(Opcodes.FCONST_0);
analyzer.visitVarInsn(Opcodes.FSTORE, 3);
analyzer.visitInsn(Opcodes.ICONST_0);
analyzer.visitInsn(Opcodes.LCONST_0);
analyzer.visitInsn(Opcodes.ICONST_0);
analyzer.visitInsn(Opcodes.DCONST_0);
frame = FrameSnapshot.create(analyzer, 0);
final Object[] vars = arr("Foo", Opcodes.DOUBLE, Opcodes.FLOAT);
final Object[] stack = arr(Opcodes.INTEGER, Opcodes.LONG,
Opcodes.INTEGER, Opcodes.DOUBLE);
expectedVisitor.visitFrame(Opcodes.F_FULL, 3, vars, 4, stack);
}
@Test
public void should_decrease_stack_when_popCount_is_given() {
analyzer.visitInsn(Opcodes.ICONST_0);
analyzer.visitInsn(Opcodes.LCONST_0);
analyzer.visitInsn(Opcodes.ICONST_0);
analyzer.visitInsn(Opcodes.ICONST_0);
frame = FrameSnapshot.create(analyzer, 2);
final Object[] stack = arr(Opcodes.INTEGER, Opcodes.LONG);
expectedVisitor.visitFrame(Opcodes.F_FULL, 1, arr("Foo"), 2, stack);
}
/**
* Test of <a href="https://gitlab.ow2.org/asm/asm/issues/317793">ASM
* bug</a>: according to <a href=
* "https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.10.1.9.aaload">JVMS
* "4.10.1.9 Type Checking Instructions, AALOAD"</a> resulting type on the
* operand stack should be null if the input array is null.
*/
@Test
public void after_aaload_stack_should_contain_null_when_input_array_is_null() {
analyzer.visitInsn(Opcodes.ACONST_NULL);
analyzer.visitInsn(Opcodes.ICONST_0);
analyzer.visitInsn(Opcodes.AALOAD);
frame = FrameSnapshot.create(analyzer, 0);
final Object[] stack = arr(Opcodes.NULL);
expectedVisitor.visitFrame(Opcodes.F_FULL, 1, arr("Foo"), 1, stack);
}
private Object[] arr(Object... elements) {
return elements;
}
}
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