/**
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2005 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.objectweb.asm.util.attrs;
import java.util.List;
import java.util.Map;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Label;
import org.objectweb.asm.attrs.StackMapAttribute;
import org.objectweb.asm.attrs.StackMapFrame;
import org.objectweb.asm.attrs.StackMapType;
/**
* An {@link ASMifiable} {@link StackMapAttribute} sub class.
*
* @author Eugene Kuleshov
*/
public class ASMStackMapAttribute extends StackMapAttribute implements
ASMifiable,
Traceable
{
/**
* Length of the attribute used for comparison
*/
private int len;
public ASMStackMapAttribute() {
super();
}
public ASMStackMapAttribute(List frames, int len) {
super(frames);
this.len = len;
}
protected Attribute read(
ClassReader cr,
int off,
int len,
char[] buf,
int codeOff,
Label[] labels)
{
StackMapAttribute attr = (StackMapAttribute) super.read(cr,
off,
len,
buf,
codeOff,
labels);
return new ASMStackMapAttribute(attr.getFrames(), len);
}
public void asmify(StringBuffer buf, String varName, Map labelNames) {
List frames = getFrames();
buf.append("{\n");
buf.append("StackMapAttribute ").append(varName).append("Attr");
buf.append(" = new StackMapAttribute();\n");
if (frames.size() > 0) {
for (int i = 0; i < frames.size(); i++) {
asmify((StackMapFrame) frames.get(i), buf, varName + "frame"
+ i, labelNames);
}
}
buf.append(varName).append(".visitAttribute(").append(varName);
buf.append("Attr);\n}\n");
}
void asmify(
StackMapFrame f,
StringBuffer buf,
String varName,
Map labelNames)
{
declareLabel(buf, labelNames, f.label);
buf.append("{\n");
buf.append("StackMapFrame ")
.append(varName)
.append(" = new StackMapFrame();\n");
buf.append(varName)
.append(".label = ")
.append(labelNames.get(f.label))
.append(";\n");
asmifyTypeInfo(buf, varName, labelNames, f.locals, "locals");
asmifyTypeInfo(buf, varName, labelNames, f.stack, "stack");
buf.append("cvAttr.frames.add(").append(varName).append(");\n");
buf.append("}\n");
}
void asmifyTypeInfo(
StringBuffer buf,
String varName,
Map labelNames,
List infos,
String field)
{
if (infos.size() > 0) {
buf.append("{\n");
for (int i = 0; i < infos.size(); i++) {
StackMapType typeInfo = (StackMapType) infos.get(i);
String localName = varName + "Info" + i;
int type = typeInfo.getType();
buf.append("StackMapType ")
.append(localName)
.append(" = StackMapType.getTypeInfo( StackMapType.ITEM_")
.append(StackMapType.ITEM_NAMES[type])
.append(");\n");
switch (type) {
case StackMapType.ITEM_Object: //
buf.append(localName)
.append(".setObject(\"")
.append(typeInfo.getObject())
.append("\");\n");
break;
case StackMapType.ITEM_Uninitialized: //
declareLabel(buf, labelNames, typeInfo.getLabel());
buf.append(localName)
.append(".setLabel(")
.append(labelNames.get(typeInfo.getLabel()))
.append(");\n");
break;
}
buf.append(varName)
.append(".")
.append(field)
.append(".add(")
.append(localName)
.append(");\n");
}
buf.append("}\n");
}
}
static void declareLabel(StringBuffer buf, Map labelNames, Label l) {
String name = (String) labelNames.get(l);
if (name == null) {
name = "l" + labelNames.size();
labelNames.put(l, name);
buf.append("Label ").append(name).append(" = new Label();\n");
}
}
public void trace(StringBuffer buf, Map labelNames) {
List frames = getFrames();
buf.append("[\n");
for (int i = 0; i < frames.size(); i++) {
StackMapFrame f = (StackMapFrame) frames.get(i);
buf.append(" Frame:");
appendLabel(buf, labelNames, f.label);
buf.append(" locals[");
traceTypeInfo(buf, labelNames, f.locals);
buf.append("]");
buf.append(" stack[");
traceTypeInfo(buf, labelNames, f.stack);
buf.append("]\n");
}
buf.append(" ] length:").append(len).append("\n");
}
private void traceTypeInfo(StringBuffer buf, Map labelNames, List infos) {
String sep = "";
for (int i = 0; i < infos.size(); i++) {
StackMapType t = (StackMapType) infos.get(i);
buf.append(sep).append(StackMapType.ITEM_NAMES[t.getType()]);
sep = ", ";
if (t.getType() == StackMapType.ITEM_Object) {
buf.append(":").append(t.getObject());
}
if (t.getType() == StackMapType.ITEM_Uninitialized) {
buf.append(":");
appendLabel(buf, labelNames, t.getLabel());
}
}
}
protected void appendLabel(StringBuffer buf, Map labelNames, Label l) {
String name = (String) labelNames.get(l);
if (name == null) {
name = "L" + labelNames.size();
labelNames.put(l, name);
}
buf.append(name);
}
}