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/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.nodes.graphbuilderconf;
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import static jdk.vm.ci.meta.DeoptimizationAction.InvalidateReprofile;
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import static jdk.vm.ci.meta.DeoptimizationReason.NullCheckException;
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import static org.graalvm.compiler.core.common.type.StampFactory.objectNonNull;
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import org.graalvm.compiler.bytecode.Bytecode;
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import org.graalvm.compiler.bytecode.BytecodeProvider;
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import org.graalvm.compiler.core.common.type.AbstractPointerStamp;
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import org.graalvm.compiler.core.common.type.ObjectStamp;
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import org.graalvm.compiler.core.common.type.Stamp;
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import org.graalvm.compiler.core.common.type.StampFactory;
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import org.graalvm.compiler.core.common.type.StampPair;
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import org.graalvm.compiler.nodes.CallTargetNode;
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import org.graalvm.compiler.nodes.ConstantNode;
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import org.graalvm.compiler.nodes.CallTargetNode.InvokeKind;
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import org.graalvm.compiler.nodes.FixedGuardNode;
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import org.graalvm.compiler.nodes.LogicNode;
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import org.graalvm.compiler.nodes.PiNode;
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import org.graalvm.compiler.nodes.StateSplit;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.calc.IsNullNode;
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import org.graalvm.compiler.nodes.type.StampTool;
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import jdk.vm.ci.code.BailoutException;
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import jdk.vm.ci.meta.Assumptions;
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import jdk.vm.ci.meta.DeoptimizationAction;
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import jdk.vm.ci.meta.DeoptimizationReason;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.JavaType;
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import jdk.vm.ci.meta.ResolvedJavaMethod;
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/**
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* Used by a {@link GraphBuilderPlugin} to interface with an object that parses the bytecode of a
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* single {@linkplain #getMethod() method} as part of building a {@linkplain #getGraph() graph} .
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*/
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public interface GraphBuilderContext extends GraphBuilderTool {
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/**
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* Pushes a given value to the frame state stack using an explicit kind. This should be used
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* when {@code value.getJavaKind()} is different from the kind that the bytecode instruction
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* currently being parsed pushes to the stack.
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*
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* @param kind the kind to use when type checking this operation
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* @param value the value to push to the stack. The value must already have been
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* {@linkplain #append(ValueNode) appended}.
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*/
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void push(JavaKind kind, ValueNode value);
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/**
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* Adds a node to the graph. If the returned node is a {@link StateSplit} with a null
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* {@linkplain StateSplit#stateAfter() frame state}, the frame state is initialized.
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*
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* @param value the value to add to the graph and push to the stack. The
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* {@code value.getJavaKind()} kind is used when type checking this operation.
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* @return a node equivalent to {@code value} in the graph
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*/
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default <T extends ValueNode> T add(T value) {
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if (value.graph() != null) {
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assert !(value instanceof StateSplit) || ((StateSplit) value).stateAfter() != null;
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return value;
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}
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T equivalentValue = append(value);
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if (equivalentValue instanceof StateSplit) {
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StateSplit stateSplit = (StateSplit) equivalentValue;
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if (stateSplit.stateAfter() == null && stateSplit.hasSideEffect()) {
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setStateAfter(stateSplit);
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}
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}
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return equivalentValue;
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}
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default ValueNode addNonNullCast(ValueNode value) {
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AbstractPointerStamp valueStamp = (AbstractPointerStamp) value.stamp();
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if (valueStamp.nonNull()) {
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return value;
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} else {
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LogicNode isNull = add(IsNullNode.create(value));
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FixedGuardNode fixedGuard = add(new FixedGuardNode(isNull, DeoptimizationReason.NullCheckException, DeoptimizationAction.None, true));
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Stamp newStamp = valueStamp.improveWith(StampFactory.objectNonNull());
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return add(new PiNode(value, newStamp, fixedGuard));
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}
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}
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/**
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* Adds a node with a non-void kind to the graph, pushes it to the stack. If the returned node
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* is a {@link StateSplit} with a null {@linkplain StateSplit#stateAfter() frame state}, the
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* frame state is initialized.
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*
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* @param kind the kind to use when type checking this operation
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* @param value the value to add to the graph and push to the stack
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* @return a node equivalent to {@code value} in the graph
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*/
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default <T extends ValueNode> T addPush(JavaKind kind, T value) {
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T equivalentValue = value.graph() != null ? value : append(value);
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push(kind, equivalentValue);
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if (equivalentValue instanceof StateSplit) {
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StateSplit stateSplit = (StateSplit) equivalentValue;
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if (stateSplit.stateAfter() == null && stateSplit.hasSideEffect()) {
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setStateAfter(stateSplit);
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}
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}
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return equivalentValue;
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}
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/**
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* Handles an invocation that a plugin determines can replace the original invocation (i.e., the
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* one for which the plugin was applied). This applies all standard graph builder processing to
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* the replaced invocation including applying any relevant plugins.
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*
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* @param invokeKind the kind of the replacement invocation
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* @param targetMethod the target of the replacement invocation
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* @param args the arguments to the replacement invocation
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* @param forceInlineEverything specifies if all invocations encountered in the scope of
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* handling the replaced invoke are to be force inlined
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*/
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void handleReplacedInvoke(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] args, boolean forceInlineEverything);
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void handleReplacedInvoke(CallTargetNode callTarget, JavaKind resultType);
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/**
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* Intrinsifies an invocation of a given method by inlining the bytecodes of a given
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* substitution method.
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*
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* @param bytecodeProvider used to get the bytecodes to parse for the substitution method
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* @param targetMethod the method being intrinsified
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* @param substitute the intrinsic implementation
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* @param receiver the receiver, or null for static methods
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* @param argsIncludingReceiver the arguments with which to inline the invocation
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*
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* @return whether the intrinsification was successful
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*/
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boolean intrinsify(BytecodeProvider bytecodeProvider, ResolvedJavaMethod targetMethod, ResolvedJavaMethod substitute, InvocationPlugin.Receiver receiver, ValueNode[] argsIncludingReceiver);
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/**
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* Creates a snap shot of the current frame state with the BCI of the instruction after the one
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* currently being parsed and assigns it to a given {@linkplain StateSplit#hasSideEffect() side
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* effect} node.
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*
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* @param sideEffect a side effect node just appended to the graph
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*/
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void setStateAfter(StateSplit sideEffect);
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/**
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* Gets the parsing context for the method that inlines the method being parsed by this context.
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*/
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GraphBuilderContext getParent();
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/**
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* Gets the first ancestor parsing context that is not parsing a {@linkplain #parsingIntrinsic()
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* intrinsic}.
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*/
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default GraphBuilderContext getNonIntrinsicAncestor() {
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GraphBuilderContext ancestor = getParent();
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while (ancestor != null && ancestor.parsingIntrinsic()) {
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ancestor = ancestor.getParent();
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}
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return ancestor;
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}
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/**
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* Gets the code being parsed.
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*/
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Bytecode getCode();
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/**
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* Gets the method being parsed by this context.
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*/
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ResolvedJavaMethod getMethod();
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/**
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* Gets the index of the bytecode instruction currently being parsed.
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*/
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int bci();
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/**
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* Gets the kind of invocation currently being parsed.
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*/
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InvokeKind getInvokeKind();
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/**
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* Gets the return type of the invocation currently being parsed.
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*/
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JavaType getInvokeReturnType();
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default StampPair getInvokeReturnStamp(Assumptions assumptions) {
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JavaType returnType = getInvokeReturnType();
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return StampFactory.forDeclaredType(assumptions, returnType, false);
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}
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/**
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* Gets the inline depth of this context. A return value of 0 implies that this is the context
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* for the parse root.
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*/
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default int getDepth() {
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GraphBuilderContext parent = getParent();
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return parent == null ? 0 : 1 + parent.getDepth();
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}
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/**
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* Determines if this parsing context is within the bytecode of an intrinsic or a method inlined
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* by an intrinsic.
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*/
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@Override
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default boolean parsingIntrinsic() {
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return getIntrinsic() != null;
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}
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/**
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* Gets the intrinsic of the current parsing context or {@code null} if not
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* {@link #parsingIntrinsic() parsing an intrinsic}.
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*/
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IntrinsicContext getIntrinsic();
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BailoutException bailout(String string);
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default ValueNode nullCheckedValue(ValueNode value) {
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return nullCheckedValue(value, InvalidateReprofile);
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}
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/**
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* Gets a version of a given value that has a {@linkplain StampTool#isPointerNonNull(ValueNode)
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* non-null} stamp.
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*/
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default ValueNode nullCheckedValue(ValueNode value, DeoptimizationAction action) {
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if (!StampTool.isPointerNonNull(value.stamp())) {
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LogicNode condition = getGraph().unique(IsNullNode.create(value));
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ObjectStamp receiverStamp = (ObjectStamp) value.stamp();
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Stamp stamp = receiverStamp.join(objectNonNull());
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FixedGuardNode fixedGuard = append(new FixedGuardNode(condition, NullCheckException, action, true));
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PiNode nonNullReceiver = getGraph().unique(new PiNode(value, stamp, fixedGuard));
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// TODO: Propogating the non-null into the frame state would
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// remove subsequent null-checks on the same value. However,
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// it currently causes an assertion failure when merging states.
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//
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// frameState.replace(value, nonNullReceiver);
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return nonNullReceiver;
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}
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return value;
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}
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@SuppressWarnings("unused")
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default void notifyReplacedCall(ResolvedJavaMethod targetMethod, ConstantNode node) {
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}
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}
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