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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.classgen.asm;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.InterfaceHelperClassNode;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.CastExpression;
import org.codehaus.groovy.ast.expr.ClassExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.TupleExpression;
import org.codehaus.groovy.classgen.AsmClassGenerator;
import org.codehaus.groovy.runtime.callsite.CallSite;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import static org.objectweb.asm.Opcodes.*;
/**
* This class represents non public API used by AsmClassGenerator. Don't
* use this class in your code
* @author Jochen Theodorou
*/
public class CallSiteWriter {
private static final Set NAMES = new HashSet();
private static final Set BASIC = new HashSet();
static {
Collections.addAll(NAMES, "plus", "minus", "multiply", "div", "compareTo", "or", "and", "xor", "intdiv", "mod", "leftShift", "rightShift", "rightShiftUnsigned");
Collections.addAll(BASIC, "plus", "minus", "multiply", "div");
}
private static String [] sig = new String [255];
private static String getCreateArraySignature(int numberOfArguments) {
if (sig[numberOfArguments] == null) {
StringBuilder sb = new StringBuilder("(");
for (int i = 0; i != numberOfArguments; ++i) {
sb.append("Ljava/lang/Object;");
}
sb.append(")[Ljava/lang/Object;");
sig[numberOfArguments] = sb.toString();
}
return sig[numberOfArguments];
}
private static final int
MOD_PRIVSS = ACC_PRIVATE+ACC_STATIC+ACC_SYNTHETIC,
MOD_PUBSS = ACC_PUBLIC+ACC_STATIC+ACC_SYNTHETIC;
private static final ClassNode CALLSITE_ARRAY_NODE = ClassHelper.make(CallSite[].class);
private static final String
GET_CALLSITE_METHOD = "$getCallSiteArray",
CALLSITE_CLASS = "org/codehaus/groovy/runtime/callsite/CallSite",
CALLSITE_DESC = "[Lorg/codehaus/groovy/runtime/callsite/CallSite;",
GET_CALLSITE_DESC = "()"+CALLSITE_DESC,
CALLSITE_ARRAY_CLASS = "org/codehaus/groovy/runtime/callsite/CallSiteArray",
GET_CALLSITEARRAY_DESC = "()Lorg/codehaus/groovy/runtime/callsite/CallSiteArray;",
CALLSITE_FIELD = "$callSiteArray",
REF_CLASS = "java/lang/ref/SoftReference",
REF_DESC = "L"+REF_CLASS+";",
METHOD_OO_DESC = "(Ljava/lang/Object;)Ljava/lang/Object;",
CREATE_CSA_METHOD = "$createCallSiteArray";
public static final String CONSTRUCTOR = "<$constructor$>";
private final List callSites = new ArrayList(32);
private int callSiteArrayVarIndex = -1;
private WriterController controller;
public CallSiteWriter(WriterController wc) {
this.controller = wc;
ClassNode node = controller.getClassNode();
if(node instanceof InterfaceHelperClassNode) {
InterfaceHelperClassNode ihcn = (InterfaceHelperClassNode) node;
callSites.addAll(ihcn.getCallSites());
}
}
public void makeSiteEntry() {
if (controller.isNotClinit()) {
controller.getMethodVisitor().visitMethodInsn(INVOKESTATIC, controller.getInternalClassName(), GET_CALLSITE_METHOD, GET_CALLSITE_DESC, false);
controller.getOperandStack().push(CALLSITE_ARRAY_NODE);
callSiteArrayVarIndex = controller.getCompileStack().defineTemporaryVariable("$local$callSiteArray", CALLSITE_ARRAY_NODE, true);
}
}
public void generateCallSiteArray() {
if (!controller.getClassNode().isInterface()) {
controller.getClassVisitor().visitField(MOD_PRIVSS, CALLSITE_FIELD, REF_DESC, null, null);
generateCreateCallSiteArray();
generateGetCallSiteArray();
}
}
private void generateGetCallSiteArray() {
int visibility = (controller.getClassNode() instanceof InterfaceHelperClassNode) ? MOD_PUBSS : MOD_PRIVSS;
MethodVisitor mv = controller.getClassVisitor().visitMethod(visibility, GET_CALLSITE_METHOD, GET_CALLSITE_DESC, null, null);
controller.setMethodVisitor(mv);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, controller.getInternalClassName(), "$callSiteArray", "Ljava/lang/ref/SoftReference;");
Label l0 = new Label();
mv.visitJumpInsn(IFNULL, l0);
mv.visitFieldInsn(GETSTATIC, controller.getInternalClassName(), "$callSiteArray", "Ljava/lang/ref/SoftReference;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/ref/SoftReference", "get", "()Ljava/lang/Object;", false);
mv.visitTypeInsn(CHECKCAST, "org/codehaus/groovy/runtime/callsite/CallSiteArray");
mv.visitInsn(DUP);
mv.visitVarInsn(ASTORE, 0);
Label l1 = new Label();
mv.visitJumpInsn(IFNONNULL, l1);
mv.visitLabel(l0);
mv.visitMethodInsn(INVOKESTATIC, controller.getInternalClassName(), "$createCallSiteArray", "()Lorg/codehaus/groovy/runtime/callsite/CallSiteArray;", false);
mv.visitVarInsn(ASTORE, 0);
mv.visitTypeInsn(NEW, "java/lang/ref/SoftReference");
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/ref/SoftReference", "", "(Ljava/lang/Object;)V", false);
mv.visitFieldInsn(PUTSTATIC, controller.getInternalClassName(), "$callSiteArray", "Ljava/lang/ref/SoftReference;");
mv.visitLabel(l1);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "org/codehaus/groovy/runtime/callsite/CallSiteArray", "array", "[Lorg/codehaus/groovy/runtime/callsite/CallSite;");
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private void generateCreateCallSiteArray() {
List callSiteInitMethods = new LinkedList();
int index = 0;
int methodIndex = 0;
final int size = callSites.size();
final int maxArrayInit = 5000;
// create array initialization methods
while (index < size) {
methodIndex++;
String methodName = "$createCallSiteArray_" + methodIndex;
callSiteInitMethods.add(methodName);
MethodVisitor mv = controller.getClassVisitor().visitMethod(MOD_PRIVSS, methodName, "([Ljava/lang/String;)V", null, null);
controller.setMethodVisitor(mv);
mv.visitCode();
int methodLimit = size;
// check if the next block is over the max allowed
if ((methodLimit - index) > maxArrayInit) {
methodLimit = index + maxArrayInit;
}
for (; index < methodLimit; index++) {
mv.visitVarInsn(ALOAD, 0);
mv.visitLdcInsn(index);
mv.visitLdcInsn(callSites.get(index));
mv.visitInsn(AASTORE);
}
mv.visitInsn(RETURN);
mv.visitMaxs(2,1);
mv.visitEnd();
}
// create base createCallSiteArray method
MethodVisitor mv = controller.getClassVisitor().visitMethod(MOD_PRIVSS, CREATE_CSA_METHOD, GET_CALLSITEARRAY_DESC, null, null);
controller.setMethodVisitor(mv);
mv.visitCode();
mv.visitLdcInsn(size);
mv.visitTypeInsn(ANEWARRAY, "java/lang/String");
mv.visitVarInsn(ASTORE, 0);
for (String methodName : callSiteInitMethods) {
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESTATIC, controller.getInternalClassName(), methodName, "([Ljava/lang/String;)V", false);
}
mv.visitTypeInsn(NEW, CALLSITE_ARRAY_CLASS);
mv.visitInsn(DUP);
controller.getAcg().visitClassExpression(new ClassExpression(controller.getClassNode()));
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, CALLSITE_ARRAY_CLASS, "", "(Ljava/lang/Class;[Ljava/lang/String;)V", false);
mv.visitInsn(ARETURN);
mv.visitMaxs(0,0);
mv.visitEnd();
}
private int allocateIndex(String name) {
callSites.add(name);
return callSites.size()-1;
}
private void invokeSafe(boolean safe, String unsafeMethod, String safeMethod) {
String method = unsafeMethod;
if (safe) method = safeMethod;
controller.getMethodVisitor().visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, method, METHOD_OO_DESC, true);
controller.getOperandStack().replace(ClassHelper.OBJECT_TYPE);
}
public void prepareCallSite(String message) {
MethodVisitor mv = controller.getMethodVisitor();
if (controller.isNotClinit()) {
mv.visitVarInsn(ALOAD, callSiteArrayVarIndex);
} else {
mv.visitMethodInsn(INVOKESTATIC, controller.getClassName(), GET_CALLSITE_METHOD, GET_CALLSITE_DESC, false);
}
final int index = allocateIndex(message);
mv.visitLdcInsn(index);
mv.visitInsn(AALOAD);
}
private void prepareSiteAndReceiver(Expression receiver, String methodName, boolean implicitThis) {
prepareSiteAndReceiver(receiver, methodName, implicitThis, false);
}
protected void prepareSiteAndReceiver(Expression receiver, String methodName, boolean implicitThis, boolean lhs) {
//site
prepareCallSite(methodName);
// receiver
CompileStack compileStack = controller.getCompileStack();
compileStack.pushImplicitThis(implicitThis);
compileStack.pushLHS(lhs);
receiver.visit(controller.getAcg());
controller.getOperandStack().box();
compileStack.popLHS();
compileStack.popImplicitThis();
}
protected void visitBoxedArgument(Expression exp) {
exp.visit(controller.getAcg());
if (!(exp instanceof TupleExpression)) {
// we are not in a tuple, so boxing might be missing for
// this single argument call
controller.getOperandStack().box();
}
}
public void makeSingleArgumentCall(Expression receiver, String message, Expression arguments) {
OperandStack operandStack = controller.getOperandStack();
int m1 = operandStack.getStackLength();
//slow Path
prepareSiteAndReceiver(receiver, message, false, controller.getCompileStack().isLHS());
visitBoxedArgument(arguments);
int m2 = operandStack.getStackLength();
controller.getMethodVisitor().visitMethodInsn(INVOKEINTERFACE, "org/codehaus/groovy/runtime/callsite/CallSite", "call", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", true);
operandStack.replace(ClassHelper.OBJECT_TYPE, m2-m1);
}
public void makeGroovyObjectGetPropertySite(Expression receiver, String methodName, boolean safe, boolean implicitThis) {
prepareSiteAndReceiver(receiver, methodName, implicitThis);
invokeSafe(safe, "callGroovyObjectGetProperty", "callGroovyObjectGetPropertySafe");
}
public void makeGetPropertySite(Expression receiver, String methodName, boolean safe, boolean implicitThis) {
prepareSiteAndReceiver(receiver, methodName, implicitThis);
invokeSafe(safe, "callGetProperty", "callGetPropertySafe");
}
public void makeCallSite(Expression receiver, String message, Expression arguments, boolean safe, boolean implicitThis, boolean callCurrent, boolean callStatic) {
prepareSiteAndReceiver(receiver, message, implicitThis);
CompileStack compileStack = controller.getCompileStack();
compileStack.pushImplicitThis(implicitThis);
compileStack.pushLHS(false);
boolean constructor = message.equals(CONSTRUCTOR);
OperandStack operandStack = controller.getOperandStack();
// arguments
boolean containsSpreadExpression = AsmClassGenerator.containsSpreadExpression(arguments);
int numberOfArguments = containsSpreadExpression ? -1 : AsmClassGenerator.argumentSize(arguments);
int operandsToReplace = 1;
if (numberOfArguments > MethodCallerMultiAdapter.MAX_ARGS || containsSpreadExpression) {
ArgumentListExpression ae;
if (arguments instanceof ArgumentListExpression) {
ae = (ArgumentListExpression) arguments;
} else if (arguments instanceof TupleExpression) {
TupleExpression te = (TupleExpression) arguments;
ae = new ArgumentListExpression(te.getExpressions());
} else {
ae = new ArgumentListExpression();
ae.addExpression(arguments);
}
controller.getCompileStack().pushImplicitThis(false);
if (containsSpreadExpression) {
numberOfArguments = -1;
controller.getAcg().despreadList(ae.getExpressions(), true);
} else {
numberOfArguments = ae.getExpressions().size();
for (int i = 0; i < numberOfArguments; i++) {
Expression argument = ae.getExpression(i);
argument.visit(controller.getAcg());
operandStack.box();
if (argument instanceof CastExpression) controller.getAcg().loadWrapper(argument);
}
operandsToReplace += numberOfArguments;
}
controller.getCompileStack().popImplicitThis();
}
controller.getCompileStack().popLHS();
controller.getCompileStack().popImplicitThis();
MethodVisitor mv = controller.getMethodVisitor();
if (numberOfArguments > 4) {
final String createArraySignature = getCreateArraySignature(numberOfArguments);
mv.visitMethodInsn(INVOKESTATIC, "org/codehaus/groovy/runtime/ArrayUtil", "createArray", createArraySignature, false);
//TODO: use pre-generated Object[]
operandStack.replace(ClassHelper.OBJECT_TYPE.makeArray(),numberOfArguments);
operandsToReplace = operandsToReplace-numberOfArguments+1;
}
final String desc = getDescForParamNum(numberOfArguments);
if (callStatic) {
mv.visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, "callStatic", "(Ljava/lang/Class;" + desc, true);
} else if (constructor) {
mv.visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, "callConstructor", "(Ljava/lang/Object;" + desc, true);
} else if (callCurrent) {
mv.visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, "callCurrent", "(Lgroovy/lang/GroovyObject;" + desc, true);
} else if (safe) {
mv.visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, "callSafe", "(Ljava/lang/Object;" + desc, true);
} else {
mv.visitMethodInsn(INVOKEINTERFACE, CALLSITE_CLASS, "call", "(Ljava/lang/Object;" + desc, true);
}
operandStack.replace(ClassHelper.OBJECT_TYPE,operandsToReplace);
}
private static String getDescForParamNum(int numberOfArguments) {
switch (numberOfArguments) {
case 0:
return ")Ljava/lang/Object;";
case 1:
return "Ljava/lang/Object;)Ljava/lang/Object;";
case 2:
return "Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;";
case 3:
return "Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;";
case 4:
return "Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;";
default:
return "[Ljava/lang/Object;)Ljava/lang/Object;";
}
}
public List getCallSites() {
return callSites;
}
public void makeCallSiteArrayInitializer() {
final String classInternalName = BytecodeHelper.getClassInternalName(controller.getClassNode());
MethodVisitor mv = controller.getMethodVisitor();
mv.visitInsn(ACONST_NULL);
mv.visitFieldInsn(PUTSTATIC, classInternalName, "$callSiteArray", "Ljava/lang/ref/SoftReference;");
}
public boolean hasCallSiteUse() {
return callSiteArrayVarIndex>=0;
}
}