19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.graalvm.compiler.core.test;
24
25 import org.junit.Assert;
26 import org.junit.Test;
27
28 import org.graalvm.compiler.debug.Debug;
29 import org.graalvm.compiler.debug.Debug.Scope;
30 import org.graalvm.compiler.debug.DebugDumpScope;
31 import org.graalvm.compiler.nodes.ParameterNode;
32 import org.graalvm.compiler.nodes.StructuredGraph;
33 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
34 import org.graalvm.compiler.nodes.memory.FloatingReadNode;
35 import org.graalvm.compiler.nodes.spi.LoweringTool;
36 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
37 import org.graalvm.compiler.phases.common.FloatingReadPhase;
38 import org.graalvm.compiler.phases.common.LoweringPhase;
39 import org.graalvm.compiler.phases.common.OptimizeGuardAnchorsPhase;
40 import org.graalvm.compiler.phases.tiers.PhaseContext;
41
42 /* consider
43 * B b = (B) a;
44 * return b.x10;
45 *
46 * With snippets a typecheck is performed and if it was successful, a PiNode is created.
47 * For the read node, however, there is only a dependency to the PiNode, but not to the
48 * typecheck itself. With special crafting, it's possible to get the scheduler moving the
49 * FloatingReadNode before the typecheck. Assuming the object is of the wrong type (here for
50 * example A), an invalid field read is done.
51 *
52 * In order to avoid this situation, an anchor node is introduced in CheckCastSnippts.
53 */
54
55 public class ReadAfterCheckCastTest extends GraphScheduleTest {
56
57 public static long foo = 0;
58
59 public static class A {
76 b.x10 += 1;
77 return b.x10;
78 }
79 }
80
81 @Test
82 public void test1() {
83 test("test1Snippet");
84 }
85
86 @SuppressWarnings("try")
87 private void test(final String snippet) {
88 try (Scope s = Debug.scope("ReadAfterCheckCastTest", new DebugDumpScope(snippet))) {
89 // check shape of graph, with lots of assumptions. will probably fail if graph
90 // structure changes significantly
91 StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
92 PhaseContext context = new PhaseContext(getProviders());
93 CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
94 new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
95 new FloatingReadPhase().apply(graph);
96 new OptimizeGuardAnchorsPhase().apply(graph);
97 canonicalizer.apply(graph, context);
98
99 Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "After lowering");
100
101 for (FloatingReadNode node : graph.getNodes(ParameterNode.TYPE).first().usages().filter(FloatingReadNode.class)) {
102 // Checking that the parameter a is not directly used for the access to field
103 // x10 (because x10 must be guarded by the checkcast).
104 Assert.assertTrue(node.getLocationIdentity().isImmutable());
105 }
106 } catch (Throwable e) {
107 throw Debug.handle(e);
108 }
109 }
110 }
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.graalvm.compiler.core.test;
24
25 import org.junit.Assert;
26 import org.junit.Test;
27
28 import org.graalvm.compiler.debug.Debug;
29 import org.graalvm.compiler.debug.Debug.Scope;
30 import org.graalvm.compiler.debug.DebugDumpScope;
31 import org.graalvm.compiler.nodes.ParameterNode;
32 import org.graalvm.compiler.nodes.StructuredGraph;
33 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
34 import org.graalvm.compiler.nodes.memory.FloatingReadNode;
35 import org.graalvm.compiler.nodes.spi.LoweringTool;
36 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
37 import org.graalvm.compiler.phases.common.FloatingReadPhase;
38 import org.graalvm.compiler.phases.common.LoweringPhase;
39 import org.graalvm.compiler.phases.tiers.PhaseContext;
40
41 /* consider
42 * B b = (B) a;
43 * return b.x10;
44 *
45 * With snippets a typecheck is performed and if it was successful, a PiNode is created.
46 * For the read node, however, there is only a dependency to the PiNode, but not to the
47 * typecheck itself. With special crafting, it's possible to get the scheduler moving the
48 * FloatingReadNode before the typecheck. Assuming the object is of the wrong type (here for
49 * example A), an invalid field read is done.
50 *
51 * In order to avoid this situation, an anchor node is introduced in CheckCastSnippts.
52 */
53
54 public class ReadAfterCheckCastTest extends GraphScheduleTest {
55
56 public static long foo = 0;
57
58 public static class A {
75 b.x10 += 1;
76 return b.x10;
77 }
78 }
79
80 @Test
81 public void test1() {
82 test("test1Snippet");
83 }
84
85 @SuppressWarnings("try")
86 private void test(final String snippet) {
87 try (Scope s = Debug.scope("ReadAfterCheckCastTest", new DebugDumpScope(snippet))) {
88 // check shape of graph, with lots of assumptions. will probably fail if graph
89 // structure changes significantly
90 StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
91 PhaseContext context = new PhaseContext(getProviders());
92 CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
93 new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
94 new FloatingReadPhase().apply(graph);
95 canonicalizer.apply(graph, context);
96
97 Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "After lowering");
98
99 for (FloatingReadNode node : graph.getNodes(ParameterNode.TYPE).first().usages().filter(FloatingReadNode.class)) {
100 // Checking that the parameter a is not directly used for the access to field
101 // x10 (because x10 must be guarded by the checkcast).
102 Assert.assertTrue(node.getLocationIdentity().isImmutable());
103 }
104 } catch (Throwable e) {
105 throw Debug.handle(e);
106 }
107 }
108 }
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