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/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.codegen;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import java.lang.invoke.MethodType;
import java.util.ArrayList;
import java.util.List;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.ir.Expression;
import jdk.nashorn.internal.ir.FunctionNode;
import jdk.nashorn.internal.runtime.ScriptFunction;
import jdk.nashorn.internal.runtime.linker.LinkerCallSite;
/**
* Class that generates function signatures for dynamic calls
*/
public final class FunctionSignature {
/** parameter types that ASM can understand */
private final Type[] paramTypes;
/** return type that ASM can understand */
private final Type returnType;
/** valid Java descriptor string for function */
private final String descriptor;
/** {@link MethodType} for function */
private final MethodType methodType;
/**
* Constructor
*
* Create a FunctionSignature given arguments as AST Nodes
*
* @param hasSelf does the function have a self slot?
* @param hasCallee does the function need a callee variable
* @param retType what is the return type
* @param args argument list of AST Nodes
*/
public FunctionSignature(final boolean hasSelf, final boolean hasCallee, final Type retType, final List<? extends Expression> args) {
this(hasSelf, hasCallee, retType, FunctionSignature.typeArray(args));
}
/**
* Constructor
*
* Create a FunctionSignature given arguments as AST Nodes
*
* @param hasSelf does the function have a self slot?
* @param hasCallee does the function need a callee variable
* @param retType what is the return type
* @param nArgs number of arguments
*/
public FunctionSignature(final boolean hasSelf, final boolean hasCallee, final Type retType, final int nArgs) {
this(hasSelf, hasCallee, retType, FunctionSignature.objectArgs(nArgs));
}
/**
* Constructor
*
* Create a FunctionSignature given argument types only
*
* @param hasSelf does the function have a self slot?
* @param hasCallee does the function have a callee slot?
* @param retType what is the return type
* @param argTypes argument list of AST Nodes
*/
private FunctionSignature(final boolean hasSelf, final boolean hasCallee, final Type retType, final Type... argTypes) {
final boolean isVarArg;
int count = 1;
if (argTypes == null) {
isVarArg = true;
} else {
isVarArg = argTypes.length > LinkerCallSite.ARGLIMIT;
count = isVarArg ? 1 : argTypes.length;
}
if (hasCallee) {
count++;
}
if (hasSelf) {
count++;
}
paramTypes = new Type[count];
int next = 0;
if (hasCallee) {
paramTypes[next++] = Type.typeFor(ScriptFunction.class);
}
if (hasSelf) {
paramTypes[next++] = Type.OBJECT;
}
if (isVarArg) {
paramTypes[next] = Type.OBJECT_ARRAY;
} else if (argTypes != null) {
for (int j = 0; next < count;) {
final Type type = argTypes[j++];
// TODO: for now, turn java/lang/String into java/lang/Object as we aren't as specific.
paramTypes[next++] = type.isObject() ? Type.OBJECT : type;
}
} else {
assert false : "isVarArgs cannot be false when argTypes are null";
}
this.returnType = retType;
this.descriptor = Type.getMethodDescriptor(returnType, paramTypes);
final List<Class<?>> paramTypeList = new ArrayList<>();
for (final Type paramType : paramTypes) {
paramTypeList.add(paramType.getTypeClass());
}
this.methodType = MH.type(returnType.getTypeClass(), paramTypeList.toArray(new Class[paramTypes.length]));
}
/**
* Create a function signature given a function node, using as much
* type information for parameters and return types that is available
*
* @param functionNode the function node
*/
public FunctionSignature(final FunctionNode functionNode) {
this(
true,
functionNode.needsCallee(),
functionNode.getReturnType(),
(functionNode.isVarArg() && !functionNode.isProgram()) ?
null :
functionNode.getParameters());
}
/**
* Internal function that converts an array of nodes to their Types
*
* @param args node arg list
*
* @return the array of types
*/
private static Type[] typeArray(final List<? extends Expression> args) {
if (args == null) {
return null;
}
final Type[] typeArray = new Type[args.size()];
int pos = 0;
for (final Expression arg : args) {
typeArray[pos++] = arg.getType();
}
return typeArray;
}
@Override
public String toString() {
return descriptor;
}
/**
* @return the number of param types
*/
public int size() {
return paramTypes.length;
}
/**
* Return the {@link MethodType} for this function signature
* @return the method type
*/
public MethodType getMethodType() {
return methodType;
}
/**
* Return the return type for this function signature
* @return the return type
*/
public Type getReturnType() {
return returnType;
}
private static Type[] objectArgs(final int nArgs) {
final Type[] array = new Type[nArgs];
for (int i = 0; i < nArgs; i++) {
array[i] = Type.OBJECT;
}
return array;
}
}
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