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+// ASM: a very small and fast Java bytecode manipulation framework
+// Copyright (c) 2000-2011 INRIA, France Telecom
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// 3. Neither the name of the copyright holders nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+// THE POSSIBILITY OF SUCH DAMAGE.
+package org.objectweb.asm.tree.analysis;
+
+import static java.time.Duration.ofSeconds;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.test.AsmTest;
+import org.objectweb.asm.test.AsmTest.PrecompiledClass;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.MethodNode;
+
+/**
+ * Unit tests for {@link Analyzer}, when used with a {@link BasicInterpreter}.
+ *
+ * @author Eric Bruneton
+ */
+class AnalyzerWithBasicInterpreterTest extends AsmTest {
+
+ private static final String CLASS_NAME = "C";
+
+ @Test
+ void testConstructor() {
+ assertDoesNotThrow(() -> new BasicInterpreter());
+ assertThrows(IllegalStateException.class, () -> new BasicInterpreter() {});
+ }
+
+ @Test
+ void testAnalyze_invalidNewArray() {
+ MethodNode methodNode =
+ new MethodNodeBuilder().iconst_0().intInsn(Opcodes.NEWARRAY, -1).vreturn().build();
+
+ Executable analyze =
+ () -> new Analyzer<BasicValue>(new BasicInterpreter()).analyze(CLASS_NAME, methodNode);
+
+ String message = assertThrows(AnalyzerException.class, analyze).getMessage();
+ assertTrue(message.contains("Invalid array type"));
+ }
+
+ /**
+ * Tests that the precompiled classes can be successfully analyzed with a BasicInterpreter, and
+ * that Analyzer can be subclassed to use custom frames.
+ *
+ * @throws AnalyzerException if the test class can't be analyzed.
+ */
+ @ParameterizedTest
+ @MethodSource(ALL_CLASSES_AND_LATEST_API)
+ void testAnalyze_basicInterpreter(final PrecompiledClass classParameter, final Api apiParameter)
+ throws AnalyzerException {
+ ClassNode classNode = new ClassNode();
+ new ClassReader(classParameter.getBytes()).accept(classNode, 0);
+ Analyzer<BasicValue> analyzer =
+ new Analyzer<BasicValue>(new BasicInterpreter()) {
+ @Override
+ protected Frame<BasicValue> newFrame(final int numLocals, final int numStack) {
+ return new CustomFrame(numLocals, numStack);
+ }
+
+ @Override
+ protected Frame<BasicValue> newFrame(final Frame<? extends BasicValue> src) {
+ return new CustomFrame(src);
+ }
+ };
+
+ ArrayList<Frame<? extends BasicValue>[]> methodFrames = new ArrayList<>();
+ for (MethodNode methodNode : classNode.methods) {
+ methodFrames.add(analyzer.analyze(classNode.name, methodNode));
+ }
+
+ for (Frame<? extends BasicValue>[] frames : methodFrames) {
+ for (Frame<? extends BasicValue> frame : frames) {
+ assertTrue(frame == null || frame instanceof CustomFrame);
+ }
+ }
+ }
+
+ /**
+ * Tests that the precompiled classes can be successfully analyzed with a BasicInterpreter, even
+ * if the method node's max locals and max stack size are not set.
+ *
+ * @throws AnalyzerException if the test class can't be analyzed.
+ */
+ @ParameterizedTest
+ @MethodSource(ALL_CLASSES_AND_LATEST_API)
+ void testAnalyzeAndComputeMaxs_basicInterpreter(
+ final PrecompiledClass classParameter, final Api apiParameter) throws AnalyzerException {
+ ClassNode classNode = new ClassNode();
+ new ClassReader(classParameter.getBytes()).accept(classNode, 0);
+ ArrayList<MethodMaxs> methodMaxs = new ArrayList<>();
+ for (MethodNode methodNode : classNode.methods) {
+ methodMaxs.add(new MethodMaxs(methodNode.maxStack, methodNode.maxLocals));
+ methodNode.maxLocals = 0;
+ methodNode.maxStack = 0;
+ }
+ Analyzer<BasicValue> analyzer = new Analyzer<BasicValue>(new BasicInterpreter());
+
+ ArrayList<MethodMaxs> analyzedMethodMaxs = new ArrayList<>();
+ for (MethodNode methodNode : classNode.methods) {
+ analyzer.analyzeAndComputeMaxs(classNode.name, methodNode);
+ analyzedMethodMaxs.add(new MethodMaxs(methodNode.maxStack, methodNode.maxLocals));
+ }
+
+ // jdk3.SubOptimalMaxStackAndLocals has non optimal max stack and max local values on purpose.
+ assumeTrue(classParameter != PrecompiledClass.JDK3_SUB_OPTIMAL_MAX_STACK_AND_LOCALS);
+ for (int i = 0; i < analyzedMethodMaxs.size(); ++i) {
+ assertTrue(analyzedMethodMaxs.get(i).maxLocals >= methodMaxs.get(i).maxLocals);
+ assertTrue(analyzedMethodMaxs.get(i).maxStack >= methodMaxs.get(i).maxStack);
+ }
+ }
+
+ /**
+ * Tests that analyzeAndComputeMaxs computes the smallest possible maxLocals for static methods.
+ *
+ * @throws AnalyzerException if the test class can't be analyzed.
+ */
+ @Test
+ void testAnalyzeAndComputeMaxs_staticMethod() throws AnalyzerException {
+ MethodNode methodNode =
+ new MethodNodeBuilder("(I)V", /* maxStack = */ 0, /* maxLocals = */ 0).vreturn().build();
+ methodNode.access |= Opcodes.ACC_STATIC;
+ Analyzer<BasicValue> analyzer = new Analyzer<BasicValue>(new BasicInterpreter());
+
+ analyzer.analyzeAndComputeMaxs("C", methodNode);
+
+ assertEquals(1, methodNode.maxLocals);
+ assertEquals(0, methodNode.maxStack);
+ }
+
+ /**
+ * Tests that the analyzer does not loop infinitely, even if the {@link Interpreter#merge} method
+ * does not follow its required contract (namely that if the merge result is equal to the first
+ * argument, the first argument should be returned - see #316326).
+ *
+ * @throws AnalyzerException if the test class can't be analyzed.
+ */
+ @Test
+ void testAnalyze_badInterpreter() {
+ ClassNode classNode = new ClassNode();
+ new ClassReader(PrecompiledClass.JDK8_ALL_FRAMES.getBytes()).accept(classNode, 0);
+ Analyzer<BasicValue> analyzer =
+ new Analyzer<BasicValue>(
+ new BasicInterpreter(/* latest */ Opcodes.ASM10_EXPERIMENTAL) {
+ @Override
+ public BasicValue merge(final BasicValue value1, final BasicValue value2) {
+ return new BasicValue(super.merge(value1, value2).getType());
+ }
+ });
+
+ ArrayList<Executable> analyses = new ArrayList<>();
+ for (MethodNode methodNode : classNode.methods) {
+ analyses.add(() -> analyzer.analyze(CLASS_NAME, methodNode));
+ }
+
+ for (Executable analysis : analyses) {
+ assertTimeoutPreemptively(ofSeconds(1), analysis);
+ }
+ }
+
+ /**
+ * Tests that stack map frames are correctly merged when a JSR instruction can be reached from two
+ * different control flow paths, with different local variable types (#316204).
+ *
+ * @throws IOException if the test class can't be loaded.
+ * @throws AnalyzerException if the test class can't be analyzed.
+ */
+ @Test
+ void testAnalyze_mergeWithJsrReachableFromTwoDifferentPaths()
+ throws IOException, AnalyzerException {
+ ClassReader classReader =
+ new ClassReader(Files.newInputStream(Paths.get("src/test/resources/Issue316204.class")));
+ ClassNode classNode = new ClassNode();
+ classReader.accept(classNode, 0);
+ Analyzer<BasicValue> analyzer = new Analyzer<>(new BasicInterpreter());
+
+ analyzer.analyze(classNode.name, getMethod(classNode, "basicStopBundles"));
+
+ assertEquals("RIR..... ", analyzer.getFrames()[104].toString());
+ }
+
+ private static MethodNode getMethod(final ClassNode classNode, final String name) {
+ for (MethodNode methodNode : classNode.methods) {
+ if (methodNode.name.equals(name)) {
+ return methodNode;
+ }
+ }
+ return null;
+ }
+
+ private static class CustomFrame extends Frame<BasicValue> {
+
+ CustomFrame(final int numLocals, final int numStack) {
+ super(numLocals, numStack);
+ }
+
+ CustomFrame(final Frame<? extends BasicValue> frame) {
+ super(frame);
+ }
+
+ @Override
+ public Frame<BasicValue> init(final Frame<? extends BasicValue> frame) {
+ assertTrue(frame instanceof CustomFrame);
+ return super.init(frame);
+ }
+ }
+
+ private static class MethodMaxs {
+
+ public final int maxStack;
+ public final int maxLocals;
+
+ public MethodMaxs(final int maxStack, final int maxLocals) {
+ this.maxStack = maxStack;
+ this.maxLocals = maxLocals;
+ }
+ }
+}