+ * {@link Word}-type rewriting for {@link GraphBuilderContext#parsingIntrinsic intrinsic} functions + * (snippets and method substitutions), by forwarding to the {@link WordOperationPlugin}. Note that + * we forward the {@link NodePlugin} and {@link TypePlugin} methods, but not the + * {@link InlineInvokePlugin} methods implemented by {@link WordOperationPlugin}. The latter is not + * necessary because HotSpot only uses the {@link Word} type in methods that are force-inlined, + * i.e., there are never non-inlined invokes that involve the {@link Word} type. + *
+ * Constant folding of field loads. + */ +public final class HotSpotNodePlugin implements NodePlugin, TypePlugin { + protected final WordOperationPlugin wordOperationPlugin; + + public HotSpotNodePlugin(WordOperationPlugin wordOperationPlugin) { + this.wordOperationPlugin = wordOperationPlugin; + } + + @Override + public boolean canChangeStackKind(GraphBuilderContext b) { + if (b.parsingIntrinsic()) { + return wordOperationPlugin.canChangeStackKind(b); + } + return false; + } + + @Override + public StampPair interceptType(GraphBuilderTool b, JavaType declaredType, boolean nonNull) { + if (b.parsingIntrinsic()) { + return wordOperationPlugin.interceptType(b, declaredType, nonNull); + } + return null; + } + + @Override + public boolean handleInvoke(GraphBuilderContext b, ResolvedJavaMethod method, ValueNode[] args) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleInvoke(b, method, args)) { + return true; + } + return false; + } + + @Override + public boolean handleLoadField(GraphBuilderContext b, ValueNode object, ResolvedJavaField field) { + if (!ImmutableCode.getValue() || b.parsingIntrinsic()) { + if (object.isConstant()) { + JavaConstant asJavaConstant = object.asJavaConstant(); + if (tryReadField(b, field, asJavaConstant)) { + return true; + } + } + } + if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadField(b, object, field)) { + return true; + } + return false; + } + + @Override + public boolean handleLoadStaticField(GraphBuilderContext b, ResolvedJavaField field) { + if (!ImmutableCode.getValue() || b.parsingIntrinsic()) { + if (tryReadField(b, field, null)) { + return true; + } + } + if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadStaticField(b, field)) { + return true; + } + return false; + } + + private static boolean tryReadField(GraphBuilderContext b, ResolvedJavaField field, JavaConstant object) { + // FieldReadEnabledInImmutableCode is non null only if assertions are enabled + if (FieldReadEnabledInImmutableCode != null && ImmutableCode.getValue()) { + FieldReadEnabledInImmutableCode.set(Boolean.TRUE); + try { + return tryConstantFold(b, field, object); + } finally { + FieldReadEnabledInImmutableCode.set(null); + } + } else { + return tryConstantFold(b, field, object); + } + } + + private static boolean tryConstantFold(GraphBuilderContext b, ResolvedJavaField field, JavaConstant object) { + ConstantNode result = ConstantFoldUtil.tryConstantFold(b.getConstantFieldProvider(), b.getConstantReflection(), b.getMetaAccess(), field, object); + if (result != null) { + result = b.getGraph().unique(result); + b.push(field.getJavaKind(), result); + return true; + } + return false; + } + + @Override + public boolean handleStoreField(GraphBuilderContext b, ValueNode object, ResolvedJavaField field, ValueNode value) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreField(b, object, field, value)) { + return true; + } + return false; + } + + @Override + public boolean handleStoreStaticField(GraphBuilderContext b, ResolvedJavaField field, ValueNode value) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreStaticField(b, field, value)) { + return true; + } + return false; + } + + @Override + public boolean handleLoadIndexed(GraphBuilderContext b, ValueNode array, ValueNode index, JavaKind elementKind) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadIndexed(b, array, index, elementKind)) { + return true; + } + return false; + } + + @Override + public boolean handleStoreIndexed(GraphBuilderContext b, ValueNode array, ValueNode index, JavaKind elementKind, ValueNode value) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreIndexed(b, array, index, elementKind, value)) { + return true; + } + return false; + } + + @Override + public boolean handleCheckCast(GraphBuilderContext b, ValueNode object, ResolvedJavaType type, JavaTypeProfile profile) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleCheckCast(b, object, type, profile)) { + return true; + } + return false; + } + + @Override + public boolean handleInstanceOf(GraphBuilderContext b, ValueNode object, ResolvedJavaType type, JavaTypeProfile profile) { + if (b.parsingIntrinsic() && wordOperationPlugin.handleInstanceOf(b, object, type, profile)) { + return true; + } + return false; + } +}