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package org.graalvm.compiler.replacements.test;

import org.graalvm.compiler.core.test.GraalCompilerTest;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.FixedNode;
import org.graalvm.compiler.nodes.ReturnNode;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.ValueNode;
import jdk.vm.ci.meta.JavaConstant;
import org.junit.Test;

import jdk.vm.ci.meta.ResolvedJavaMethod;
import static org.hamcrest.CoreMatchers.instanceOf;
import org.junit.Assert;

Tests constant folding of String.hashCode().
/** * Tests constant folding of {@link String#hashCode()}. */
public class StringHashConstantTest extends GraalCompilerTest { private static final String A_CONSTANT_STRING = "a constant string"; private ValueNode asConstant(StructuredGraph graph, String str) { return ConstantNode.forConstant(getSnippetReflection().forObject(str), getMetaAccess(), graph); } @Test public void test1() { ResolvedJavaMethod method = getResolvedJavaMethod("parameterizedHashCode"); StructuredGraph graph = parseForCompile(method); String s = "some string"; int expected = s.hashCode(); graph.getParameter(0).replaceAndDelete(asConstant(graph, s)); compile(method, graph); FixedNode firstFixed = graph.start().next(); Assert.assertThat(firstFixed, instanceOf(ReturnNode.class)); ReturnNode ret = (ReturnNode) firstFixed; JavaConstant result = ret.result().asJavaConstant(); if (result == null) { Assert.fail("result not constant: " + ret.result()); } else { Assert.assertEquals("result", expected, result.asInt()); } } public static int parameterizedHashCode(String value) { return value.hashCode(); } @Test public void test2() { ResolvedJavaMethod method = getResolvedJavaMethod("constantHashCode"); StructuredGraph graph = parseForCompile(method); FixedNode firstFixed = graph.start().next(); Assert.assertThat(firstFixed, instanceOf(ReturnNode.class)); ReturnNode ret = (ReturnNode) firstFixed; JavaConstant result = ret.result().asJavaConstant(); if (result == null) { Assert.fail("result not constant: " + ret.result()); } else { int expected = A_CONSTANT_STRING.hashCode(); Assert.assertEquals("result", expected, result.asInt()); } } public static int constantHashCode() { return A_CONSTANT_STRING.hashCode(); } }