/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/*
* $Id: MethodGenerator.java,v 1.2.4.1 2005/09/05 11:16:47 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import java.util.Hashtable;
import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.ICONST;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.MethodGen;
import com.sun.org.apache.bcel.internal.generic.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Pattern;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public class MethodGenerator extends MethodGen
implements com.sun.org.apache.xalan.internal.xsltc.compiler.Constants {
protected static final int INVALID_INDEX = -1;
private static final String START_ELEMENT_SIG
= "(" + STRING_SIG + ")V";
private static final String END_ELEMENT_SIG
= START_ELEMENT_SIG;
private InstructionList _mapTypeSub;
private static final int DOM_INDEX = 1;
private static final int ITERATOR_INDEX = 2;
private static final int HANDLER_INDEX = 3;
private Instruction _iloadCurrent;
private Instruction _istoreCurrent;
private final Instruction _astoreHandler;
private final Instruction _aloadHandler;
private final Instruction _astoreIterator;
private final Instruction _aloadIterator;
private final Instruction _aloadDom;
private final Instruction _astoreDom;
private final Instruction _startElement;
private final Instruction _endElement;
private final Instruction _startDocument;
private final Instruction _endDocument;
private final Instruction _attribute;
private final Instruction _uniqueAttribute;
private final Instruction _namespace;
private final Instruction _setStartNode;
private final Instruction _reset;
private final Instruction _nextNode;
private SlotAllocator _slotAllocator;
private boolean _allocatorInit = false;
/**
* A mapping between patterns and instruction lists used by
* test sequences to avoid compiling the same pattern multiple
* times. Note that patterns whose kernels are "*", "node()"
* and "@*" can between shared by test sequences.
*/
private Hashtable _preCompiled = new Hashtable();
public MethodGenerator(int access_flags, Type return_type,
Type[] arg_types, String[] arg_names,
String method_name, String class_name,
InstructionList il, ConstantPoolGen cpg) {
super(access_flags, return_type, arg_types, arg_names, method_name,
class_name, il, cpg);
_astoreHandler = new ASTORE(HANDLER_INDEX);
_aloadHandler = new ALOAD(HANDLER_INDEX);
_astoreIterator = new ASTORE(ITERATOR_INDEX);
_aloadIterator = new ALOAD(ITERATOR_INDEX);
_aloadDom = new ALOAD(DOM_INDEX);
_astoreDom = new ASTORE(DOM_INDEX);
final int startElement =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"startElement",
START_ELEMENT_SIG);
_startElement = new INVOKEINTERFACE(startElement, 2);
final int endElement =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"endElement",
END_ELEMENT_SIG);
_endElement = new INVOKEINTERFACE(endElement, 2);
final int attribute =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"addAttribute",
"("
+ STRING_SIG
+ STRING_SIG
+ ")V");
_attribute = new INVOKEINTERFACE(attribute, 3);
final int uniqueAttribute =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"addUniqueAttribute",
"("
+ STRING_SIG
+ STRING_SIG
+ "I)V");
_uniqueAttribute = new INVOKEINTERFACE(uniqueAttribute, 4);
final int namespace =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"namespaceAfterStartElement",
"("
+ STRING_SIG
+ STRING_SIG
+ ")V");
_namespace = new INVOKEINTERFACE(namespace, 3);
int index = cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"startDocument",
"()V");
_startDocument = new INVOKEINTERFACE(index, 1);
index = cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"endDocument",
"()V");
_endDocument = new INVOKEINTERFACE(index, 1);
index = cpg.addInterfaceMethodref(NODE_ITERATOR,
SET_START_NODE,
SET_START_NODE_SIG);
_setStartNode = new INVOKEINTERFACE(index, 2);
index = cpg.addInterfaceMethodref(NODE_ITERATOR,
"reset", "()"+NODE_ITERATOR_SIG);
_reset = new INVOKEINTERFACE(index, 1);
index = cpg.addInterfaceMethodref(NODE_ITERATOR, NEXT, NEXT_SIG);
_nextNode = new INVOKEINTERFACE(index, 1);
_slotAllocator = new SlotAllocator();
_slotAllocator.initialize(getLocalVariables());
_allocatorInit = true;
}
/**
* Allocates a local variable. If the slot allocator has already been
* initialized, then call addLocalVariable2() so that the new variable
* is known to the allocator. Failing to do this may cause the allocator
* to return a slot that is already in use.
*/
public LocalVariableGen addLocalVariable(String name, Type type,
InstructionHandle start,
InstructionHandle end)
{
return (_allocatorInit) ? addLocalVariable2(name, type, start)
: super.addLocalVariable(name, type, start, end);
}
public LocalVariableGen addLocalVariable2(String name, Type type,
InstructionHandle start)
{
return super.addLocalVariable(name, type,
_slotAllocator.allocateSlot(type),
start, null);
}
public void removeLocalVariable(LocalVariableGen lvg) {
_slotAllocator.releaseSlot(lvg);
super.removeLocalVariable(lvg);
}
public Instruction loadDOM() {
return _aloadDom;
}
public Instruction storeDOM() {
return _astoreDom;
}
public Instruction storeHandler() {
return _astoreHandler;
}
public Instruction loadHandler() {
return _aloadHandler;
}
public Instruction storeIterator() {
return _astoreIterator;
}
public Instruction loadIterator() {
return _aloadIterator;
}
public final Instruction setStartNode() {
return _setStartNode;
}
public final Instruction reset() {
return _reset;
}
public final Instruction nextNode() {
return _nextNode;
}
public final Instruction startElement() {
return _startElement;
}
public final Instruction endElement() {
return _endElement;
}
public final Instruction startDocument() {
return _startDocument;
}
public final Instruction endDocument() {
return _endDocument;
}
public final Instruction attribute() {
return _attribute;
}
public final Instruction uniqueAttribute() {
return _uniqueAttribute;
}
public final Instruction namespace() {
return _namespace;
}
public Instruction loadCurrentNode() {
if (_iloadCurrent == null) {
int idx = getLocalIndex("current");
if (idx > 0)
_iloadCurrent = new ILOAD(idx);
else
_iloadCurrent = new ICONST(0);
}
return _iloadCurrent;
}
public Instruction storeCurrentNode() {
return _istoreCurrent != null
? _istoreCurrent
: (_istoreCurrent = new ISTORE(getLocalIndex("current")));
}
/** by default context node is the same as current node. MK437 */
public Instruction loadContextNode() {
return loadCurrentNode();
}
public Instruction storeContextNode() {
return storeCurrentNode();
}
public int getLocalIndex(String name) {
return getLocalVariable(name).getIndex();
}
public LocalVariableGen getLocalVariable(String name) {
final LocalVariableGen[] vars = getLocalVariables();
for (int i = 0; i < vars.length; i++)
if (vars[i].getName().equals(name))
return vars[i];
return null;
}
public void setMaxLocals() {
// Get the current number of local variable slots
int maxLocals = super.getMaxLocals();
int prevLocals = maxLocals;
// Get numer of actual variables
final LocalVariableGen[] localVars = super.getLocalVariables();
if (localVars != null) {
if (localVars.length > maxLocals)
maxLocals = localVars.length;
}
// We want at least 5 local variable slots (for parameters)
if (maxLocals < 5) maxLocals = 5;
super.setMaxLocals(maxLocals);
}
/**
* Add a pre-compiled pattern to this mode.
*/
public void addInstructionList(Pattern pattern,
InstructionList ilist)
{
_preCompiled.put(pattern, ilist);
}
/**
* Get the instruction list for a pre-compiled pattern. Used by
* test sequences to avoid compiling patterns more than once.
*/
public InstructionList getInstructionList(Pattern pattern) {
return (InstructionList) _preCompiled.get(pattern);
}
}