208 lines
7.0 KiB
Java
208 lines
7.0 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.classLoader;
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import com.ibm.wala.ipa.callgraph.CGNode;
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import com.ibm.wala.ipa.callgraph.ContextItem;
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import com.ibm.wala.shrikeBT.BytecodeConstants;
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import com.ibm.wala.shrikeBT.IInvokeInstruction;
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import com.ibm.wala.ssa.IR;
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import com.ibm.wala.types.MethodReference;
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import com.ibm.wala.util.debug.Assertions;
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/**
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* Simple object that represents a static call site (ie., an invoke instruction in the bytecode)
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*
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* Note that the identity of a call site reference depends on two things: the program counter, and the containing IR. Thus, it
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* suffices to define equals() and hashCode() from {@link ProgramCounter}, since this class does not maintain a pointer to the
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* containing {@link IR} (or {@link CGNode}) anyway. If using a hashtable of CallSiteReference from different IRs, you probably want
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* to use a wrapper which also holds a pointer to the governing CGNode.
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*/
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public abstract class CallSiteReference extends ProgramCounter implements BytecodeConstants, ContextItem {
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final private MethodReference declaredTarget;
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/**
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* @param programCounter Index into bytecode describing this instruction
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* @param declaredTarget The method target as declared at the call site
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*/
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protected CallSiteReference(int programCounter, MethodReference declaredTarget) {
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super(programCounter);
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this.declaredTarget = declaredTarget;
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = super.hashCode();
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result = prime * result + ((declaredTarget == null) ? 0 : declaredTarget.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (!super.equals(obj))
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return false;
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if (getClass() != obj.getClass())
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return false;
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CallSiteReference other = (CallSiteReference) obj;
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if (declaredTarget == null) {
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if (other.declaredTarget != null)
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return false;
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} else if (!declaredTarget.equals(other.declaredTarget))
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return false;
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return true;
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}
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// the following atrocities are needed to save a word of space by
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// declaring these classes static, so they don't keep a pointer
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// to the enclosing environment
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// Java makes you type!
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static class StaticCall extends CallSiteReference {
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StaticCall(int programCounter, MethodReference declaredTarget) {
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super(programCounter, declaredTarget);
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}
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@Override
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public IInvokeInstruction.IDispatch getInvocationCode() {
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return IInvokeInstruction.Dispatch.STATIC;
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}
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}
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static class SpecialCall extends CallSiteReference {
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SpecialCall(int programCounter, MethodReference declaredTarget) {
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super(programCounter, declaredTarget);
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}
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@Override
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public IInvokeInstruction.IDispatch getInvocationCode() {
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return IInvokeInstruction.Dispatch.SPECIAL;
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}
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}
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static class VirtualCall extends CallSiteReference {
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VirtualCall(int programCounter, MethodReference declaredTarget) {
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super(programCounter, declaredTarget);
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}
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@Override
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public IInvokeInstruction.IDispatch getInvocationCode() {
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return IInvokeInstruction.Dispatch.VIRTUAL;
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}
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}
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static class InterfaceCall extends CallSiteReference {
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InterfaceCall(int programCounter, MethodReference declaredTarget) {
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super(programCounter, declaredTarget);
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}
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@Override
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public IInvokeInstruction.IDispatch getInvocationCode() {
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return IInvokeInstruction.Dispatch.INTERFACE;
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}
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}
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/**
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* This factory method plays a little game to avoid storing the invocation code in the object; this saves a byte (probably
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* actually a whole word) in each created object.
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*
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* TODO: Consider canonicalization?
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*/
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public static CallSiteReference make(int programCounter, MethodReference declaredTarget,
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IInvokeInstruction.IDispatch invocationCode) {
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if (invocationCode == IInvokeInstruction.Dispatch.SPECIAL)
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return new SpecialCall(programCounter, declaredTarget);
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if (invocationCode == IInvokeInstruction.Dispatch.VIRTUAL)
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return new VirtualCall(programCounter, declaredTarget);
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if (invocationCode == IInvokeInstruction.Dispatch.INTERFACE)
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return new InterfaceCall(programCounter, declaredTarget);
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if (invocationCode == IInvokeInstruction.Dispatch.STATIC)
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return new StaticCall(programCounter, declaredTarget);
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throw new IllegalArgumentException("unsupported code: " + invocationCode);
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}
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/**
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* Return the Method that this call site calls. This represents the method declared in the invoke instruction only.
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*/
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public MethodReference getDeclaredTarget() {
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return declaredTarget;
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}
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/**
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* Return one of INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, or INVOKEINTERFACE
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*/
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abstract public IInvokeInstruction.IDispatch getInvocationCode();
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@Override
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public String toString() {
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return "invoke" + getInvocationString(getInvocationCode()) + " " + declaredTarget + "@" + getProgramCounter();
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}
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protected String getInvocationString(IInvokeInstruction.IDispatch invocationCode) {
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if (invocationCode == IInvokeInstruction.Dispatch.STATIC)
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return "static";
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if (invocationCode == IInvokeInstruction.Dispatch.SPECIAL)
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return "special";
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if (invocationCode == IInvokeInstruction.Dispatch.VIRTUAL)
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return "virtual";
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if (invocationCode == IInvokeInstruction.Dispatch.INTERFACE)
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return "interface";
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Assertions.UNREACHABLE();
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return null;
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}
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public String getInvocationString() {
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return getInvocationString(getInvocationCode());
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}
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/**
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* Is this an invokeinterface call site?
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*/
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public final boolean isInterface() {
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return (getInvocationCode() == IInvokeInstruction.Dispatch.INTERFACE);
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}
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/**
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* Is this an invokevirtual call site?
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*/
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public final boolean isVirtual() {
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return (getInvocationCode() == IInvokeInstruction.Dispatch.VIRTUAL);
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}
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/**
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* Is this an invokespecial call site?
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*/
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public final boolean isSpecial() {
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return (getInvocationCode() == IInvokeInstruction.Dispatch.SPECIAL);
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}
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/**
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* Is this an invokestatic call site?
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*/
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public boolean isStatic() {
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return (getInvocationCode() == IInvokeInstruction.Dispatch.STATIC);
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}
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public boolean isFixed() {
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return isStatic() || isSpecial();
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}
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public boolean isDispatch() {
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return isVirtual() || isInterface();
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}
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}
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