1 /*
2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
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
24
25 package org.graalvm.compiler.hotspot.meta;
26
27 import static org.graalvm.compiler.core.common.GraalOptions.AlwaysInlineVTableStubs;
28 import static org.graalvm.compiler.core.common.GraalOptions.InlineVTableStubs;
29 import static org.graalvm.compiler.core.common.GraalOptions.OmitHotExceptionStacktrace;
30 import static org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProviderImpl.OSR_MIGRATION_END;
31 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.CLASS_KLASS_LOCATION;
32 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.CLASS_MIRROR_HANDLE_LOCATION;
33 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.CLASS_MIRROR_LOCATION;
34 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.COMPRESSED_HUB_LOCATION;
35 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.DISPLACED_MARK_WORD_LOCATION;
36 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.HUB_LOCATION;
37 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.HUB_WRITE_LOCATION;
38 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.KLASS_LAYOUT_HELPER_LOCATION;
39 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJ_ARRAY_KLASS_ELEMENT_KLASS_LOCATION;
40 import static jdk.internal.vm.compiler.word.LocationIdentity.any;
41
42 import java.lang.ref.Reference;
43 import java.util.EnumMap;
44
45 import org.graalvm.compiler.api.directives.GraalDirectives;
46 import org.graalvm.compiler.core.common.CompressEncoding;
47 import org.graalvm.compiler.core.common.GraalOptions;
48 import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
49 import org.graalvm.compiler.core.common.spi.ForeignCallsProvider;
50 import org.graalvm.compiler.core.common.type.ObjectStamp;
51 import org.graalvm.compiler.core.common.type.Stamp;
52 import org.graalvm.compiler.core.common.type.StampFactory;
53 import org.graalvm.compiler.core.common.type.StampPair;
54 import org.graalvm.compiler.debug.DebugCloseable;
55 import org.graalvm.compiler.debug.DebugHandlersFactory;
56 import org.graalvm.compiler.debug.GraalError;
57 import org.graalvm.compiler.graph.Node;
58 import org.graalvm.compiler.graph.NodeInputList;
59 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
60 import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
61 import org.graalvm.compiler.hotspot.nodes.BeginLockScopeNode;
62 import org.graalvm.compiler.hotspot.nodes.G1ArrayRangePostWriteBarrier;
63 import org.graalvm.compiler.hotspot.nodes.G1ArrayRangePreWriteBarrier;
64 import org.graalvm.compiler.hotspot.nodes.G1PostWriteBarrier;
65 import org.graalvm.compiler.hotspot.nodes.G1PreWriteBarrier;
66 import org.graalvm.compiler.hotspot.nodes.G1ReferentFieldReadBarrier;
67 import org.graalvm.compiler.hotspot.nodes.HotSpotCompressionNode;
68 import org.graalvm.compiler.hotspot.nodes.HotSpotDirectCallTargetNode;
69 import org.graalvm.compiler.hotspot.nodes.HotSpotIndirectCallTargetNode;
70 import org.graalvm.compiler.hotspot.nodes.SerialArrayRangeWriteBarrier;
71 import org.graalvm.compiler.hotspot.nodes.SerialWriteBarrier;
72 import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode;
73 import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode;
74 import org.graalvm.compiler.hotspot.nodes.aot.ResolveDynamicConstantNode;
75 import org.graalvm.compiler.hotspot.nodes.aot.ResolveMethodAndLoadCountersNode;
76 import org.graalvm.compiler.hotspot.nodes.profiling.ProfileNode;
77 import org.graalvm.compiler.hotspot.nodes.type.HotSpotNarrowOopStamp;
78 import org.graalvm.compiler.hotspot.nodes.type.KlassPointerStamp;
79 import org.graalvm.compiler.hotspot.nodes.type.MethodPointerStamp;
80 import org.graalvm.compiler.hotspot.replacements.AssertionSnippets;
81 import org.graalvm.compiler.hotspot.replacements.ClassGetHubNode;
82 import org.graalvm.compiler.hotspot.replacements.HashCodeSnippets;
83 import org.graalvm.compiler.hotspot.replacements.HubGetClassNode;
84 import org.graalvm.compiler.hotspot.replacements.IdentityHashCodeNode;
85 import org.graalvm.compiler.hotspot.replacements.InstanceOfSnippets;
86 import org.graalvm.compiler.hotspot.replacements.KlassLayoutHelperNode;
87 import org.graalvm.compiler.hotspot.replacements.LoadExceptionObjectSnippets;
88 import org.graalvm.compiler.hotspot.replacements.MonitorSnippets;
89 import org.graalvm.compiler.hotspot.replacements.NewObjectSnippets;
90 import org.graalvm.compiler.hotspot.replacements.ObjectCloneSnippets;
91 import org.graalvm.compiler.hotspot.replacements.StringToBytesSnippets;
92 import org.graalvm.compiler.hotspot.replacements.UnsafeLoadSnippets;
93 import org.graalvm.compiler.hotspot.replacements.WriteBarrierSnippets;
94 import org.graalvm.compiler.hotspot.replacements.aot.ResolveConstantSnippets;
95 import org.graalvm.compiler.hotspot.replacements.arraycopy.HotSpotArraycopySnippets;
96 import org.graalvm.compiler.hotspot.replacements.profiling.ProfileSnippets;
97 import org.graalvm.compiler.hotspot.stubs.ForeignCallSnippets;
98 import org.graalvm.compiler.hotspot.word.KlassPointer;
99 import org.graalvm.compiler.nodes.AbstractBeginNode;
100 import org.graalvm.compiler.nodes.AbstractDeoptimizeNode;
101 import org.graalvm.compiler.nodes.CompressionNode.CompressionOp;
102 import org.graalvm.compiler.nodes.ComputeObjectAddressNode;
103 import org.graalvm.compiler.nodes.ConstantNode;
104 import org.graalvm.compiler.nodes.FixedNode;
105 import org.graalvm.compiler.nodes.GetObjectAddressNode;
106 import org.graalvm.compiler.nodes.Invoke;
107 import org.graalvm.compiler.nodes.LogicNode;
108 import org.graalvm.compiler.nodes.LoweredCallTargetNode;
109 import org.graalvm.compiler.nodes.NodeView;
110 import org.graalvm.compiler.nodes.ParameterNode;
111 import org.graalvm.compiler.nodes.SafepointNode;
112 import org.graalvm.compiler.nodes.StartNode;
113 import org.graalvm.compiler.nodes.StructuredGraph;
114 import org.graalvm.compiler.nodes.UnwindNode;
115 import org.graalvm.compiler.nodes.ValueNode;
116 import org.graalvm.compiler.nodes.calc.AddNode;
117 import org.graalvm.compiler.nodes.calc.FloatingNode;
118 import org.graalvm.compiler.nodes.calc.IntegerDivRemNode;
119 import org.graalvm.compiler.nodes.calc.IsNullNode;
120 import org.graalvm.compiler.nodes.calc.RemNode;
121 import org.graalvm.compiler.nodes.debug.StringToBytesNode;
122 import org.graalvm.compiler.nodes.debug.VerifyHeapNode;
123 import org.graalvm.compiler.nodes.extended.BytecodeExceptionNode;
124 import org.graalvm.compiler.nodes.extended.BytecodeExceptionNode.BytecodeExceptionKind;
125 import org.graalvm.compiler.nodes.extended.ForeignCallNode;
126 import org.graalvm.compiler.nodes.extended.GetClassNode;
127 import org.graalvm.compiler.nodes.extended.GuardedUnsafeLoadNode;
128 import org.graalvm.compiler.nodes.extended.LoadHubNode;
129 import org.graalvm.compiler.nodes.extended.LoadMethodNode;
130 import org.graalvm.compiler.nodes.extended.OSRLocalNode;
131 import org.graalvm.compiler.nodes.extended.OSRLockNode;
132 import org.graalvm.compiler.nodes.extended.OSRMonitorEnterNode;
133 import org.graalvm.compiler.nodes.extended.OSRStartNode;
134 import org.graalvm.compiler.nodes.extended.RawLoadNode;
135 import org.graalvm.compiler.nodes.extended.StoreHubNode;
136 import org.graalvm.compiler.nodes.java.ClassIsAssignableFromNode;
137 import org.graalvm.compiler.nodes.java.DynamicNewArrayNode;
138 import org.graalvm.compiler.nodes.java.DynamicNewInstanceNode;
139 import org.graalvm.compiler.nodes.java.InstanceOfDynamicNode;
140 import org.graalvm.compiler.nodes.java.InstanceOfNode;
141 import org.graalvm.compiler.nodes.java.LoadExceptionObjectNode;
142 import org.graalvm.compiler.nodes.java.MethodCallTargetNode;
143 import org.graalvm.compiler.nodes.java.MonitorExitNode;
144 import org.graalvm.compiler.nodes.java.MonitorIdNode;
145 import org.graalvm.compiler.nodes.java.NewArrayNode;
146 import org.graalvm.compiler.nodes.java.NewInstanceNode;
147 import org.graalvm.compiler.nodes.java.NewMultiArrayNode;
148 import org.graalvm.compiler.nodes.java.RawMonitorEnterNode;
149 import org.graalvm.compiler.nodes.memory.FloatingReadNode;
150 import org.graalvm.compiler.nodes.memory.HeapAccess.BarrierType;
151 import org.graalvm.compiler.nodes.memory.ReadNode;
152 import org.graalvm.compiler.nodes.memory.WriteNode;
153 import org.graalvm.compiler.nodes.memory.address.AddressNode;
154 import org.graalvm.compiler.nodes.spi.LoweringProvider;
155 import org.graalvm.compiler.nodes.spi.LoweringTool;
156 import org.graalvm.compiler.nodes.spi.StampProvider;
157 import org.graalvm.compiler.nodes.type.StampTool;
158 import org.graalvm.compiler.nodes.util.GraphUtil;
159 import org.graalvm.compiler.options.OptionValues;
160 import org.graalvm.compiler.replacements.DefaultJavaLoweringProvider;
161 import org.graalvm.compiler.replacements.arraycopy.ArrayCopyNode;
162 import org.graalvm.compiler.replacements.arraycopy.ArrayCopySnippets;
163 import org.graalvm.compiler.replacements.arraycopy.ArrayCopyWithSlowPathNode;
164 import org.graalvm.compiler.replacements.nodes.AssertionNode;
165 import jdk.internal.vm.compiler.word.LocationIdentity;
166
167 import jdk.vm.ci.code.TargetDescription;
168 import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
169 import jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider;
170 import jdk.vm.ci.hotspot.HotSpotResolvedJavaField;
171 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
172 import jdk.vm.ci.meta.JavaConstant;
173 import jdk.vm.ci.meta.JavaKind;
174 import jdk.vm.ci.meta.JavaType;
175 import jdk.vm.ci.meta.MetaAccessProvider;
176 import jdk.vm.ci.meta.ResolvedJavaField;
177 import jdk.vm.ci.meta.ResolvedJavaType;
178
179 /**
180 * HotSpot implementation of {@link LoweringProvider}.
181 */
182 public class DefaultHotSpotLoweringProvider extends DefaultJavaLoweringProvider implements HotSpotLoweringProvider {
183
184 protected final HotSpotGraalRuntimeProvider runtime;
185 protected final HotSpotRegistersProvider registers;
186 protected final HotSpotConstantReflectionProvider constantReflection;
187
188 protected InstanceOfSnippets.Templates instanceofSnippets;
189 protected NewObjectSnippets.Templates newObjectSnippets;
190 protected MonitorSnippets.Templates monitorSnippets;
191 protected WriteBarrierSnippets.Templates writeBarrierSnippets;
192 protected LoadExceptionObjectSnippets.Templates exceptionObjectSnippets;
193 protected UnsafeLoadSnippets.Templates unsafeLoadSnippets;
194 protected AssertionSnippets.Templates assertionSnippets;
195 protected ArrayCopySnippets.Templates arraycopySnippets;
196 protected StringToBytesSnippets.Templates stringToBytesSnippets;
197 protected HashCodeSnippets.Templates hashCodeSnippets;
198 protected ResolveConstantSnippets.Templates resolveConstantSnippets;
199 protected ProfileSnippets.Templates profileSnippets;
200
201 protected ObjectCloneSnippets.Templates objectCloneSnippets;
202 protected ForeignCallSnippets.Templates foreignCallSnippets;
203
204 public DefaultHotSpotLoweringProvider(HotSpotGraalRuntimeProvider runtime, MetaAccessProvider metaAccess, ForeignCallsProvider foreignCalls, HotSpotRegistersProvider registers,
205 HotSpotConstantReflectionProvider constantReflection, TargetDescription target) {
206 super(metaAccess, foreignCalls, target, runtime.getVMConfig().useCompressedOops);
207 this.runtime = runtime;
208 this.registers = registers;
209 this.constantReflection = constantReflection;
210 }
211
212 @Override
213 public void initialize(OptionValues options, Iterable<DebugHandlersFactory> factories, HotSpotProviders providers, GraalHotSpotVMConfig config) {
214 super.initialize(options, factories, runtime, providers, providers.getSnippetReflection());
215
216 assert target == providers.getCodeCache().getTarget();
217 instanceofSnippets = new InstanceOfSnippets.Templates(options, factories, runtime, providers, target);
218 newObjectSnippets = new NewObjectSnippets.Templates(options, factories, runtime, providers, target, config);
219 monitorSnippets = new MonitorSnippets.Templates(options, factories, runtime, providers, target, config.useFastLocking);
220 writeBarrierSnippets = new WriteBarrierSnippets.Templates(options, factories, runtime, providers, target, config);
221 exceptionObjectSnippets = new LoadExceptionObjectSnippets.Templates(options, factories, providers, target);
222 unsafeLoadSnippets = new UnsafeLoadSnippets.Templates(options, factories, providers, target);
223 assertionSnippets = new AssertionSnippets.Templates(options, factories, providers, target);
224 arraycopySnippets = new ArrayCopySnippets.Templates(new HotSpotArraycopySnippets(), options, factories, runtime, providers, providers.getSnippetReflection(), target);
225 stringToBytesSnippets = new StringToBytesSnippets.Templates(options, factories, providers, target);
226 hashCodeSnippets = new HashCodeSnippets.Templates(options, factories, providers, target);
227 resolveConstantSnippets = new ResolveConstantSnippets.Templates(options, factories, providers, target);
228 profileSnippets = new ProfileSnippets.Templates(options, factories, providers, target);
229 objectCloneSnippets = new ObjectCloneSnippets.Templates(options, factories, providers, target);
230 foreignCallSnippets = new ForeignCallSnippets.Templates(options, factories, providers, target);
231 }
232
233 public MonitorSnippets.Templates getMonitorSnippets() {
234 return monitorSnippets;
235 }
236
237 @Override
238 @SuppressWarnings("try")
239 public void lower(Node n, LoweringTool tool) {
240 StructuredGraph graph = (StructuredGraph) n.graph();
241 try (DebugCloseable context = n.withNodeSourcePosition()) {
242 if (n instanceof Invoke) {
243 lowerInvoke((Invoke) n, tool, graph);
244 } else if (n instanceof LoadMethodNode) {
245 lowerLoadMethodNode((LoadMethodNode) n);
246 } else if (n instanceof GetClassNode) {
247 lowerGetClassNode((GetClassNode) n, tool, graph);
248 } else if (n instanceof StoreHubNode) {
249 lowerStoreHubNode((StoreHubNode) n, graph);
250 } else if (n instanceof OSRStartNode) {
251 lowerOSRStartNode((OSRStartNode) n);
252 } else if (n instanceof BytecodeExceptionNode) {
253 lowerBytecodeExceptionNode((BytecodeExceptionNode) n);
254 } else if (n instanceof InstanceOfNode) {
255 InstanceOfNode instanceOfNode = (InstanceOfNode) n;
256 if (graph.getGuardsStage().areDeoptsFixed()) {
257 instanceofSnippets.lower(instanceOfNode, tool);
258 } else {
259 if (instanceOfNode.allowsNull()) {
260 ValueNode object = instanceOfNode.getValue();
261 LogicNode newTypeCheck = graph.addOrUniqueWithInputs(InstanceOfNode.create(instanceOfNode.type(), object, instanceOfNode.profile(), instanceOfNode.getAnchor()));
262 LogicNode newNode = LogicNode.or(graph.unique(IsNullNode.create(object)), newTypeCheck, GraalDirectives.UNLIKELY_PROBABILITY);
263 instanceOfNode.replaceAndDelete(newNode);
264 }
265 }
266 } else if (n instanceof InstanceOfDynamicNode) {
267 InstanceOfDynamicNode instanceOfDynamicNode = (InstanceOfDynamicNode) n;
268 if (graph.getGuardsStage().areDeoptsFixed()) {
269 instanceofSnippets.lower(instanceOfDynamicNode, tool);
270 } else {
271 ValueNode mirror = instanceOfDynamicNode.getMirrorOrHub();
272 if (mirror.stamp(NodeView.DEFAULT).getStackKind() == JavaKind.Object) {
273 ClassGetHubNode classGetHub = graph.unique(new ClassGetHubNode(mirror));
274 instanceOfDynamicNode.setMirror(classGetHub);
275 }
276
277 if (instanceOfDynamicNode.allowsNull()) {
278 ValueNode object = instanceOfDynamicNode.getObject();
279 LogicNode newTypeCheck = graph.addOrUniqueWithInputs(
280 InstanceOfDynamicNode.create(graph.getAssumptions(), tool.getConstantReflection(), instanceOfDynamicNode.getMirrorOrHub(), object, false));
281 LogicNode newNode = LogicNode.or(graph.unique(IsNullNode.create(object)), newTypeCheck, GraalDirectives.UNLIKELY_PROBABILITY);
282 instanceOfDynamicNode.replaceAndDelete(newNode);
283 }
284 }
285 } else if (n instanceof ClassIsAssignableFromNode) {
286 if (graph.getGuardsStage().areDeoptsFixed()) {
287 instanceofSnippets.lower((ClassIsAssignableFromNode) n, tool);
288 }
289 } else if (n instanceof NewInstanceNode) {
290 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
291 newObjectSnippets.lower((NewInstanceNode) n, registers, tool);
292 }
293 } else if (n instanceof DynamicNewInstanceNode) {
294 DynamicNewInstanceNode newInstanceNode = (DynamicNewInstanceNode) n;
295 if (newInstanceNode.getClassClass() == null) {
296 JavaConstant classClassMirror = constantReflection.asJavaClass(metaAccess.lookupJavaType(Class.class));
297 ConstantNode classClass = ConstantNode.forConstant(classClassMirror, tool.getMetaAccess(), graph);
298 newInstanceNode.setClassClass(classClass);
299 }
300 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
301 newObjectSnippets.lower(newInstanceNode, registers, tool);
302 }
303 } else if (n instanceof NewArrayNode) {
304 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
305 newObjectSnippets.lower((NewArrayNode) n, registers, tool);
306 }
307 } else if (n instanceof DynamicNewArrayNode) {
308 DynamicNewArrayNode dynamicNewArrayNode = (DynamicNewArrayNode) n;
309 if (dynamicNewArrayNode.getVoidClass() == null) {
310 JavaConstant voidClassMirror = constantReflection.asJavaClass(metaAccess.lookupJavaType(void.class));
311 ConstantNode voidClass = ConstantNode.forConstant(voidClassMirror, tool.getMetaAccess(), graph);
312 dynamicNewArrayNode.setVoidClass(voidClass);
313 }
314 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
315 newObjectSnippets.lower(dynamicNewArrayNode, registers, tool);
316 }
317 } else if (n instanceof VerifyHeapNode) {
318 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
319 newObjectSnippets.lower((VerifyHeapNode) n, registers, tool);
320 }
321 } else if (n instanceof RawMonitorEnterNode) {
322 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
323 monitorSnippets.lower((RawMonitorEnterNode) n, registers, tool);
324 }
325 } else if (n instanceof MonitorExitNode) {
326 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
327 monitorSnippets.lower((MonitorExitNode) n, registers, tool);
328 }
329 } else if (n instanceof ArrayCopyNode) {
330 arraycopySnippets.lower((ArrayCopyNode) n, tool);
331 } else if (n instanceof ArrayCopyWithSlowPathNode) {
332 arraycopySnippets.lower((ArrayCopyWithSlowPathNode) n, tool);
333 } else if (n instanceof G1PreWriteBarrier) {
334 writeBarrierSnippets.lower((G1PreWriteBarrier) n, registers, tool);
335 } else if (n instanceof G1PostWriteBarrier) {
336 writeBarrierSnippets.lower((G1PostWriteBarrier) n, registers, tool);
337 } else if (n instanceof G1ReferentFieldReadBarrier) {
338 writeBarrierSnippets.lower((G1ReferentFieldReadBarrier) n, registers, tool);
339 } else if (n instanceof SerialWriteBarrier) {
340 writeBarrierSnippets.lower((SerialWriteBarrier) n, tool);
341 } else if (n instanceof SerialArrayRangeWriteBarrier) {
342 writeBarrierSnippets.lower((SerialArrayRangeWriteBarrier) n, tool);
343 } else if (n instanceof G1ArrayRangePreWriteBarrier) {
344 writeBarrierSnippets.lower((G1ArrayRangePreWriteBarrier) n, registers, tool);
345 } else if (n instanceof G1ArrayRangePostWriteBarrier) {
346 writeBarrierSnippets.lower((G1ArrayRangePostWriteBarrier) n, registers, tool);
347 } else if (n instanceof NewMultiArrayNode) {
348 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
349 newObjectSnippets.lower((NewMultiArrayNode) n, tool);
350 }
351 } else if (n instanceof LoadExceptionObjectNode) {
352 exceptionObjectSnippets.lower((LoadExceptionObjectNode) n, registers, tool);
353 } else if (n instanceof AssertionNode) {
354 assertionSnippets.lower((AssertionNode) n, tool);
355 } else if (n instanceof StringToBytesNode) {
356 if (graph.getGuardsStage().areDeoptsFixed()) {
357 stringToBytesSnippets.lower((StringToBytesNode) n, tool);
358 }
359 } else if (n instanceof IntegerDivRemNode) {
360 // Nothing to do for division nodes. The HotSpot signal handler catches divisions by
361 // zero and the MIN_VALUE / -1 cases.
362 } else if (n instanceof AbstractDeoptimizeNode || n instanceof UnwindNode || n instanceof RemNode || n instanceof SafepointNode) {
363 /* No lowering, we generate LIR directly for these nodes. */
364 } else if (n instanceof ClassGetHubNode) {
365 lowerClassGetHubNode((ClassGetHubNode) n, tool);
366 } else if (n instanceof HubGetClassNode) {
367 lowerHubGetClassNode((HubGetClassNode) n, tool);
368 } else if (n instanceof KlassLayoutHelperNode) {
369 lowerKlassLayoutHelperNode((KlassLayoutHelperNode) n, tool);
370 } else if (n instanceof ComputeObjectAddressNode) {
371 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
372 lowerComputeObjectAddressNode((ComputeObjectAddressNode) n);
373 }
374 } else if (n instanceof IdentityHashCodeNode) {
375 hashCodeSnippets.lower((IdentityHashCodeNode) n, tool);
376 } else if (n instanceof ResolveDynamicConstantNode) {
377 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
378 resolveConstantSnippets.lower((ResolveDynamicConstantNode) n, tool);
379 }
380 } else if (n instanceof ResolveConstantNode) {
381 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
382 resolveConstantSnippets.lower((ResolveConstantNode) n, tool);
383 }
384 } else if (n instanceof ResolveMethodAndLoadCountersNode) {
385 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
386 resolveConstantSnippets.lower((ResolveMethodAndLoadCountersNode) n, tool);
387 }
388 } else if (n instanceof InitializeKlassNode) {
389 if (graph.getGuardsStage().areFrameStatesAtDeopts()) {
390 resolveConstantSnippets.lower((InitializeKlassNode) n, tool);
391 }
392 } else if (n instanceof ProfileNode) {
393 profileSnippets.lower((ProfileNode) n, tool);
394 } else {
395 super.lower(n, tool);
396 }
397 }
398 }
399
400 private static void lowerComputeObjectAddressNode(ComputeObjectAddressNode n) {
401 /*
402 * Lower the node into a ComputeObjectAddress node and an Add but ensure that it's below any
403 * potential safepoints and above it's uses.
404 */
405 for (Node use : n.usages().snapshot()) {
406 if (use instanceof FixedNode) {
407 FixedNode fixed = (FixedNode) use;
408 StructuredGraph graph = n.graph();
409 GetObjectAddressNode address = graph.add(new GetObjectAddressNode(n.getObject()));
410 graph.addBeforeFixed(fixed, address);
411 AddNode add = graph.addOrUnique(new AddNode(address, n.getOffset()));
412 use.replaceFirstInput(n, add);
413 } else {
414 throw GraalError.shouldNotReachHere("Unexpected floating use of ComputeObjectAddressNode " + n);
415 }
416 }
417 GraphUtil.unlinkFixedNode(n);
418 n.safeDelete();
419 }
420
421 private void lowerKlassLayoutHelperNode(KlassLayoutHelperNode n, LoweringTool tool) {
422 if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) {
423 return;
424 }
425 StructuredGraph graph = n.graph();
426 assert !n.getHub().isConstant();
427 AddressNode address = createOffsetAddress(graph, n.getHub(), runtime.getVMConfig().klassLayoutHelperOffset);
428 n.replaceAtUsagesAndDelete(graph.unique(new FloatingReadNode(address, KLASS_LAYOUT_HELPER_LOCATION, null, n.stamp(NodeView.DEFAULT), null, BarrierType.NONE)));
429 }
430
431 private void lowerHubGetClassNode(HubGetClassNode n, LoweringTool tool) {
432 if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) {
433 return;
434 }
435
436 ValueNode hub = n.getHub();
437 GraalHotSpotVMConfig vmConfig = runtime.getVMConfig();
438 StructuredGraph graph = n.graph();
439 assert !hub.isConstant() || GraalOptions.ImmutableCode.getValue(graph.getOptions());
440 AddressNode mirrorAddress = createOffsetAddress(graph, hub, vmConfig.classMirrorOffset);
441 FloatingReadNode read = graph.unique(
442 new FloatingReadNode(mirrorAddress, CLASS_MIRROR_LOCATION, null, vmConfig.classMirrorIsHandle ? StampFactory.forKind(target.wordJavaKind) : n.stamp(NodeView.DEFAULT),
443 null, BarrierType.NONE));
444 if (vmConfig.classMirrorIsHandle) {
445 AddressNode address = createOffsetAddress(graph, read, 0);
446 read = graph.unique(new FloatingReadNode(address, CLASS_MIRROR_HANDLE_LOCATION, null, n.stamp(NodeView.DEFAULT), null, BarrierType.NONE));
447 }
448 n.replaceAtUsagesAndDelete(read);
449 }
450
451 private void lowerClassGetHubNode(ClassGetHubNode n, LoweringTool tool) {
452 if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) {
453 return;
454 }
455
456 StructuredGraph graph = n.graph();
457 assert !n.getValue().isConstant();
458 AddressNode address = createOffsetAddress(graph, n.getValue(), runtime.getVMConfig().klassOffset);
459 FloatingReadNode read = graph.unique(new FloatingReadNode(address, CLASS_KLASS_LOCATION, null, n.stamp(NodeView.DEFAULT), null, BarrierType.NONE));
460 n.replaceAtUsagesAndDelete(read);
461 }
462
463 private void lowerInvoke(Invoke invoke, LoweringTool tool, StructuredGraph graph) {
464 if (invoke.callTarget() instanceof MethodCallTargetNode) {
465 MethodCallTargetNode callTarget = (MethodCallTargetNode) invoke.callTarget();
466 NodeInputList<ValueNode> parameters = callTarget.arguments();
467 ValueNode receiver = parameters.size() <= 0 ? null : parameters.get(0);
468 if (!callTarget.isStatic() && receiver.stamp(NodeView.DEFAULT) instanceof ObjectStamp && !StampTool.isPointerNonNull(receiver)) {
469 ValueNode nonNullReceiver = createNullCheckedValue(receiver, invoke.asNode(), tool);
470 parameters.set(0, nonNullReceiver);
471 receiver = nonNullReceiver;
472 }
473 JavaType[] signature = callTarget.targetMethod().getSignature().toParameterTypes(callTarget.isStatic() ? null : callTarget.targetMethod().getDeclaringClass());
474
475 LoweredCallTargetNode loweredCallTarget = null;
476 OptionValues options = graph.getOptions();
477 if (InlineVTableStubs.getValue(options) && callTarget.invokeKind().isIndirect() && (AlwaysInlineVTableStubs.getValue(options) || invoke.isPolymorphic())) {
478 HotSpotResolvedJavaMethod hsMethod = (HotSpotResolvedJavaMethod) callTarget.targetMethod();
479 ResolvedJavaType receiverType = invoke.getReceiverType();
480 if (hsMethod.isInVirtualMethodTable(receiverType)) {
481 JavaKind wordKind = runtime.getTarget().wordJavaKind;
482 ValueNode hub = createReadHub(graph, receiver, tool);
483
484 ReadNode metaspaceMethod = createReadVirtualMethod(graph, hub, hsMethod, receiverType);
485 // We use LocationNode.ANY_LOCATION for the reads that access the
486 // compiled code entry as HotSpot does not guarantee they are final
487 // values.
488 int methodCompiledEntryOffset = runtime.getVMConfig().methodCompiledEntryOffset;
489 AddressNode address = createOffsetAddress(graph, metaspaceMethod, methodCompiledEntryOffset);
490 ReadNode compiledEntry = graph.add(new ReadNode(address, any(), StampFactory.forKind(wordKind), BarrierType.NONE));
491
492 loweredCallTarget = graph.add(new HotSpotIndirectCallTargetNode(metaspaceMethod, compiledEntry, parameters.toArray(new ValueNode[parameters.size()]), callTarget.returnStamp(),
493 signature, callTarget.targetMethod(),
494 HotSpotCallingConventionType.JavaCall, callTarget.invokeKind()));
495
496 graph.addBeforeFixed(invoke.asNode(), metaspaceMethod);
497 graph.addAfterFixed(metaspaceMethod, compiledEntry);
498 }
499 }
500
501 if (loweredCallTarget == null) {
502 loweredCallTarget = graph.add(new HotSpotDirectCallTargetNode(parameters.toArray(new ValueNode[parameters.size()]), callTarget.returnStamp(),
503 signature, callTarget.targetMethod(),
504 HotSpotCallingConventionType.JavaCall,
505 callTarget.invokeKind()));
506 }
507 callTarget.replaceAndDelete(loweredCallTarget);
508 }
509 }
510
511 private CompressEncoding getOopEncoding() {
512 return runtime.getVMConfig().getOopEncoding();
513 }
514
515 @Override
516 protected Stamp loadCompressedStamp(ObjectStamp stamp) {
517 return HotSpotNarrowOopStamp.compressed(stamp, getOopEncoding());
518 }
519
520 @Override
521 protected ValueNode newCompressionNode(CompressionOp op, ValueNode value) {
522 return new HotSpotCompressionNode(op, value, getOopEncoding());
523 }
524
525 @Override
526 public ValueNode staticFieldBase(StructuredGraph graph, ResolvedJavaField f) {
527 HotSpotResolvedJavaField field = (HotSpotResolvedJavaField) f;
528 JavaConstant base = constantReflection.asJavaClass(field.getDeclaringClass());
529 return ConstantNode.forConstant(base, metaAccess, graph);
530 }
531
532 @Override
533 protected ValueNode createReadArrayComponentHub(StructuredGraph graph, ValueNode arrayHub, FixedNode anchor) {
534 /*
535 * Anchor the read of the element klass to the cfg, because it is only valid when arrayClass
536 * is an object class, which might not be the case in other parts of the compiled method.
537 */
538 AddressNode address = createOffsetAddress(graph, arrayHub, runtime.getVMConfig().arrayClassElementOffset);
539 return graph.unique(new FloatingReadNode(address, OBJ_ARRAY_KLASS_ELEMENT_KLASS_LOCATION, null, KlassPointerStamp.klassNonNull(), AbstractBeginNode.prevBegin(anchor)));
540 }
541
542 @Override
543 protected void lowerUnsafeLoadNode(RawLoadNode load, LoweringTool tool) {
544 StructuredGraph graph = load.graph();
545 if (!(load instanceof GuardedUnsafeLoadNode) && !graph.getGuardsStage().allowsFloatingGuards() && addReadBarrier(load)) {
546 unsafeLoadSnippets.lower(load, tool);
547 } else {
548 super.lowerUnsafeLoadNode(load, tool);
549 }
550 }
551
552 private void lowerLoadMethodNode(LoadMethodNode loadMethodNode) {
553 StructuredGraph graph = loadMethodNode.graph();
554 HotSpotResolvedJavaMethod method = (HotSpotResolvedJavaMethod) loadMethodNode.getMethod();
555 ReadNode metaspaceMethod = createReadVirtualMethod(graph, loadMethodNode.getHub(), method, loadMethodNode.getReceiverType());
556 graph.replaceFixed(loadMethodNode, metaspaceMethod);
557 }
558
559 private static void lowerGetClassNode(GetClassNode getClass, LoweringTool tool, StructuredGraph graph) {
560 StampProvider stampProvider = tool.getStampProvider();
561 LoadHubNode hub = graph.unique(new LoadHubNode(stampProvider, getClass.getObject()));
562 HubGetClassNode hubGetClass = graph.unique(new HubGetClassNode(tool.getMetaAccess(), hub));
563 getClass.replaceAtUsagesAndDelete(hubGetClass);
564 hub.lower(tool);
565 hubGetClass.lower(tool);
566 }
567
568 private void lowerStoreHubNode(StoreHubNode storeHub, StructuredGraph graph) {
569 WriteNode hub = createWriteHub(graph, storeHub.getObject(), storeHub.getValue());
570 graph.replaceFixed(storeHub, hub);
571 }
572
573 @Override
574 public BarrierType fieldInitializationBarrier(JavaKind entryKind) {
575 return (entryKind == JavaKind.Object && !runtime.getVMConfig().useDeferredInitBarriers) ? BarrierType.IMPRECISE : BarrierType.NONE;
576 }
577
578 @Override
579 public BarrierType arrayInitializationBarrier(JavaKind entryKind) {
580 return (entryKind == JavaKind.Object && !runtime.getVMConfig().useDeferredInitBarriers) ? BarrierType.PRECISE : BarrierType.NONE;
581 }
582
583 private void lowerOSRStartNode(OSRStartNode osrStart) {
584 StructuredGraph graph = osrStart.graph();
585 if (graph.getGuardsStage() == StructuredGraph.GuardsStage.FIXED_DEOPTS) {
586 StartNode newStart = graph.add(new StartNode());
587 ParameterNode buffer = graph.addWithoutUnique(new ParameterNode(0, StampPair.createSingle(StampFactory.forKind(runtime.getTarget().wordJavaKind))));
588 ForeignCallNode migrationEnd = graph.add(new ForeignCallNode(foreignCalls, OSR_MIGRATION_END, buffer));
589 migrationEnd.setStateAfter(osrStart.stateAfter());
590 newStart.setNext(migrationEnd);
591 FixedNode next = osrStart.next();
592 osrStart.setNext(null);
593 migrationEnd.setNext(next);
594 graph.setStart(newStart);
595
596 final int wordSize = target.wordSize;
597
598 // @formatter:off
599 // taken from c2 locals_addr = osr_buf + (max_locals-1)*wordSize)
600 // @formatter:on
601 int localsOffset = (graph.method().getMaxLocals() - 1) * wordSize;
602 for (OSRLocalNode osrLocal : graph.getNodes(OSRLocalNode.TYPE)) {
603 int size = osrLocal.getStackKind().getSlotCount();
604 int offset = localsOffset - (osrLocal.index() + size - 1) * wordSize;
605 AddressNode address = createOffsetAddress(graph, buffer, offset);
606 ReadNode load = graph.add(new ReadNode(address, any(), osrLocal.stamp(NodeView.DEFAULT), BarrierType.NONE));
607 osrLocal.replaceAndDelete(load);
608 graph.addBeforeFixed(migrationEnd, load);
609 }
610
611 // @formatter:off
612 // taken from c2 monitors_addr = osr_buf + (max_locals+mcnt*2-1)*wordSize);
613 // @formatter:on
614 final int lockCount = osrStart.stateAfter().locksSize();
615 final int locksOffset = (graph.method().getMaxLocals() + lockCount * 2 - 1) * wordSize;
616
617 // first initialize the lock slots for all enters with the displaced marks read from the
618 // buffer
619 for (OSRMonitorEnterNode osrMonitorEnter : graph.getNodes(OSRMonitorEnterNode.TYPE)) {
620 MonitorIdNode monitorID = osrMonitorEnter.getMonitorId();
621 OSRLockNode lock = (OSRLockNode) osrMonitorEnter.object();
622 final int index = lock.index();
623
624 final int offsetDisplacedHeader = locksOffset - ((index * 2) + 1) * wordSize;
625 final int offsetLockObject = locksOffset - index * 2 * wordSize;
626
627 // load the displaced mark from the osr buffer
628 AddressNode addressDisplacedHeader = createOffsetAddress(graph, buffer, offsetDisplacedHeader);
629 ReadNode loadDisplacedHeader = graph.add(new ReadNode(addressDisplacedHeader, any(), lock.stamp(NodeView.DEFAULT), BarrierType.NONE));
630 graph.addBeforeFixed(migrationEnd, loadDisplacedHeader);
631
632 // we need to initialize the stack slot for the lock
633 BeginLockScopeNode beginLockScope = graph.add(new BeginLockScopeNode(lock.getStackKind(), monitorID.getLockDepth()));
634 graph.addBeforeFixed(migrationEnd, beginLockScope);
635
636 // write the displaced mark to the correct stack slot
637 AddressNode addressDisplacedMark = createOffsetAddress(graph, beginLockScope, runtime.getVMConfig().basicLockDisplacedHeaderOffset);
638 WriteNode writeStackSlot = graph.add(new WriteNode(addressDisplacedMark, DISPLACED_MARK_WORD_LOCATION, loadDisplacedHeader, BarrierType.NONE));
639 graph.addBeforeFixed(migrationEnd, writeStackSlot);
640
641 // load the lock object from the osr buffer
642 AddressNode addressLockObject = createOffsetAddress(graph, buffer, offsetLockObject);
643 ReadNode loadObject = graph.add(new ReadNode(addressLockObject, any(), lock.stamp(NodeView.DEFAULT), BarrierType.NONE));
644 lock.replaceAndDelete(loadObject);
645 graph.addBeforeFixed(migrationEnd, loadObject);
646 }
647
648 osrStart.replaceAtUsagesAndDelete(newStart);
649 }
650 }
651
652 static final class Exceptions {
653 protected static final EnumMap<BytecodeExceptionKind, RuntimeException> cachedExceptions;
654
655 static {
656 cachedExceptions = new EnumMap<>(BytecodeExceptionKind.class);
657 cachedExceptions.put(BytecodeExceptionKind.NULL_POINTER, clearStackTrace(new NullPointerException()));
658 cachedExceptions.put(BytecodeExceptionKind.OUT_OF_BOUNDS, clearStackTrace(new ArrayIndexOutOfBoundsException()));
659 cachedExceptions.put(BytecodeExceptionKind.CLASS_CAST, clearStackTrace(new ClassCastException()));
660 cachedExceptions.put(BytecodeExceptionKind.ARRAY_STORE, clearStackTrace(new ArrayStoreException()));
661 cachedExceptions.put(BytecodeExceptionKind.DIVISION_BY_ZERO, clearStackTrace(new ArithmeticException()));
662 }
663
664 private static RuntimeException clearStackTrace(RuntimeException ex) {
665 ex.setStackTrace(new StackTraceElement[0]);
666 return ex;
667 }
668 }
669
670 public static final class RuntimeCalls {
671 public static final EnumMap<BytecodeExceptionKind, ForeignCallDescriptor> runtimeCalls;
672
673 static {
674 runtimeCalls = new EnumMap<>(BytecodeExceptionKind.class);
675 runtimeCalls.put(BytecodeExceptionKind.ARRAY_STORE, new ForeignCallDescriptor("createArrayStoreException", ArrayStoreException.class, Object.class));
676 runtimeCalls.put(BytecodeExceptionKind.CLASS_CAST, new ForeignCallDescriptor("createClassCastException", ClassCastException.class, Object.class, KlassPointer.class));
677 runtimeCalls.put(BytecodeExceptionKind.NULL_POINTER, new ForeignCallDescriptor("createNullPointerException", NullPointerException.class));
678 runtimeCalls.put(BytecodeExceptionKind.OUT_OF_BOUNDS, new ForeignCallDescriptor("createOutOfBoundsException", ArrayIndexOutOfBoundsException.class, int.class, int.class));
679 runtimeCalls.put(BytecodeExceptionKind.DIVISION_BY_ZERO, new ForeignCallDescriptor("createDivisionByZeroException", ArithmeticException.class));
680 runtimeCalls.put(BytecodeExceptionKind.INTEGER_EXACT_OVERFLOW, new ForeignCallDescriptor("createIntegerExactOverflowException", ArithmeticException.class));
681 runtimeCalls.put(BytecodeExceptionKind.LONG_EXACT_OVERFLOW, new ForeignCallDescriptor("createLongExactOverflowException", ArithmeticException.class));
682 }
683 }
684
685 private void throwCachedException(BytecodeExceptionNode node) {
686 Throwable exception = Exceptions.cachedExceptions.get(node.getExceptionKind());
687 assert exception != null;
688
689 StructuredGraph graph = node.graph();
690 FloatingNode exceptionNode = ConstantNode.forConstant(constantReflection.forObject(exception), metaAccess, graph);
691 graph.replaceFixedWithFloating(node, exceptionNode);
692 }
693
694 private void lowerBytecodeExceptionNode(BytecodeExceptionNode node) {
695 if (OmitHotExceptionStacktrace.getValue(node.getOptions())) {
696 throwCachedException(node);
697 return;
698 }
699
700 ForeignCallDescriptor descriptor = RuntimeCalls.runtimeCalls.get(node.getExceptionKind());
701 assert descriptor != null;
702
703 StructuredGraph graph = node.graph();
704 ForeignCallNode foreignCallNode = graph.add(new ForeignCallNode(foreignCalls, descriptor, node.stamp(NodeView.DEFAULT), node.getArguments()));
705 graph.replaceFixedWithFixed(node, foreignCallNode);
706 }
707
708 private boolean addReadBarrier(RawLoadNode load) {
709 if (runtime.getVMConfig().useG1GC && load.graph().getGuardsStage() == StructuredGraph.GuardsStage.FIXED_DEOPTS && load.object().getStackKind() == JavaKind.Object &&
710 load.accessKind() == JavaKind.Object && !StampTool.isPointerAlwaysNull(load.object())) {
711 ResolvedJavaType type = StampTool.typeOrNull(load.object());
712 if (type != null && !type.isArray()) {
713 return true;
714 }
715 }
716 return false;
717 }
718
719 private ReadNode createReadVirtualMethod(StructuredGraph graph, ValueNode hub, HotSpotResolvedJavaMethod method, ResolvedJavaType receiverType) {
720 return createReadVirtualMethod(graph, hub, method.vtableEntryOffset(receiverType));
721 }
722
723 private ReadNode createReadVirtualMethod(StructuredGraph graph, ValueNode hub, int vtableEntryOffset) {
724 assert vtableEntryOffset > 0;
725 // We use LocationNode.ANY_LOCATION for the reads that access the vtable
726 // entry as HotSpot does not guarantee that this is a final value.
727 Stamp methodStamp = MethodPointerStamp.methodNonNull();
728 AddressNode address = createOffsetAddress(graph, hub, vtableEntryOffset);
729 ReadNode metaspaceMethod = graph.add(new ReadNode(address, any(), methodStamp, BarrierType.NONE));
730 return metaspaceMethod;
731 }
732
733 @Override
734 protected ValueNode createReadHub(StructuredGraph graph, ValueNode object, LoweringTool tool) {
735 if (tool.getLoweringStage() != LoweringTool.StandardLoweringStage.LOW_TIER) {
736 return graph.unique(new LoadHubNode(tool.getStampProvider(), object));
737 }
738 assert !object.isConstant() || object.isNullConstant();
739
740 KlassPointerStamp hubStamp = KlassPointerStamp.klassNonNull();
741 if (runtime.getVMConfig().useCompressedClassPointers) {
742 hubStamp = hubStamp.compressed(runtime.getVMConfig().getKlassEncoding());
743 }
744
745 AddressNode address = createOffsetAddress(graph, object, runtime.getVMConfig().hubOffset);
746 LocationIdentity hubLocation = runtime.getVMConfig().useCompressedClassPointers ? COMPRESSED_HUB_LOCATION : HUB_LOCATION;
747 FloatingReadNode memoryRead = graph.unique(new FloatingReadNode(address, hubLocation, null, hubStamp, null, BarrierType.NONE));
748 if (runtime.getVMConfig().useCompressedClassPointers) {
749 return HotSpotCompressionNode.uncompress(memoryRead, runtime.getVMConfig().getKlassEncoding());
750 } else {
751 return memoryRead;
752 }
753 }
754
755 private WriteNode createWriteHub(StructuredGraph graph, ValueNode object, ValueNode value) {
756 assert !object.isConstant() || object.asConstant().isDefaultForKind();
757
758 ValueNode writeValue = value;
759 if (runtime.getVMConfig().useCompressedClassPointers) {
760 writeValue = HotSpotCompressionNode.compress(value, runtime.getVMConfig().getKlassEncoding());
761 }
762
763 AddressNode address = createOffsetAddress(graph, object, runtime.getVMConfig().hubOffset);
764 return graph.add(new WriteNode(address, HUB_WRITE_LOCATION, writeValue, BarrierType.NONE));
765 }
766
767 @Override
768 protected BarrierType fieldLoadBarrierType(ResolvedJavaField f) {
769 HotSpotResolvedJavaField loadField = (HotSpotResolvedJavaField) f;
770 BarrierType barrierType = BarrierType.NONE;
771 if (runtime.getVMConfig().useG1GC && loadField.getJavaKind() == JavaKind.Object && metaAccess.lookupJavaType(Reference.class).equals(loadField.getDeclaringClass()) &&
772 loadField.getName().equals("referent")) {
773 barrierType = BarrierType.PRECISE;
774 }
775 return barrierType;
776 }
777
778 @Override
779 public int fieldOffset(ResolvedJavaField f) {
780 return f.getOffset();
781 }
782
783 @Override
784 public int arrayLengthOffset() {
785 return runtime.getVMConfig().arrayOopDescLengthOffset();
786 }
787
788 @Override
789 protected final JavaKind getStorageKind(ResolvedJavaField field) {
790 return field.getJavaKind();
791 }
792
793 @Override
794 public ObjectCloneSnippets.Templates getObjectCloneSnippets() {
795 return objectCloneSnippets;
796 }
797
798 @Override
799 public ForeignCallSnippets.Templates getForeignCallSnippets() {
800 return foreignCallSnippets;
801 }
802 }