src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/MemoryGraphCanonicalizeTest.java
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package org.graalvm.compiler.core.test;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.memory.WriteNode;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.phases.common.FloatingReadPhase;
import org.graalvm.compiler.phases.common.IncrementalCanonicalizerPhase;
import org.graalvm.compiler.phases.common.LoweringPhase;
import org.graalvm.compiler.phases.tiers.HighTierContext;
import org.junit.Test;
public class MemoryGraphCanonicalizeTest extends GraalCompilerTest {
static class TestObject {
Object object;
Integer integer;
int value;
volatile boolean written;
}
public static void simpleElimination(TestObject object) {
object.object = object;
object.value = object.integer;
object.value = object.integer + 2;
object.value = object.integer + 3;
}
@Test
public void testSimpleElimination() {
testGraph("simpleElimination", 2);
}
public static void complexElimination(TestObject object) {
object.object = object;
object.value = object.integer;
object.value = object.integer + 2;
if (object.object == null) {
object.value = object.integer + 3;
} else {
object.object = new Object();
}
object.written = true;
object.value = 5;
}
@Test
public void testComplexElimination() {
testGraph("complexElimination", 6);
}
public void testGraph(String name, int expectedWrites) {
StructuredGraph graph = parseEager(name, StructuredGraph.AllowAssumptions.YES);
HighTierContext context = getDefaultHighTierContext();
new LoweringPhase(createCanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
new IncrementalCanonicalizerPhase<>(createCanonicalizerPhase(), new FloatingReadPhase()).apply(graph, context);
createCanonicalizerPhase().apply(graph, context);
int writes = graph.getNodes().filter(WriteNode.class).count();
assertTrue(writes == expectedWrites, "Expected %d writes, found %d", expectedWrites, writes);
}
}