/*
* Copyright (c) 2012, Codename One 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. Codename One 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 Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.tools.translator.bytecodes;
import java.util.List;
import org.objectweb.asm.Opcodes;
/**
*
* @author Shai Almog
*/
public class Field extends Instruction implements AssignableExpression {
private String owner;
private String name;
private String desc;
//private boolean useThis;
private Instruction targetOp;
private Instruction valueOp;
public Field(int opcode, String owner, String name, String desc) {
super(opcode);
this.owner = owner;
this.name = name.replace('$', '_');
this.desc = desc;
}
public boolean isObject() {
char c = desc.charAt(0);
return c == '[' || c == 'L';
}
@Override
public void addDependencies(List<String> dependencyList) {
String t = owner.replace('.', '_').replace('/', '_').replace('$', '_');
t = unarray(t);
if(t != null && !dependencyList.contains(t)) {
dependencyList.add(t);
}
if (targetOp != null) {
targetOp.addDependencies(dependencyList);
}
if (valueOp != null) {
valueOp.addDependencies(dependencyList);
}
}
public String getFieldFromThis() {
return "get_field_" + owner.replace('/', '_').replace('$', '_') +
"_" + name + "(__cn1ThisObject)";
}
public String setFieldFromThis(int arg) {
// special case for this
if(arg == 0) {
return " set_field_" + owner.replace('/', '_').replace('$', '_') +
"_" + name + "(threadStateData, __cn1ThisObject, __cn1ThisObject);\n";
}
if(isObject()) {
return " set_field_" + owner.replace('/', '_').replace('$', '_') +
"_" + name + "(threadStateData, __cn1Arg" + arg + ", __cn1ThisObject);\n";
}
return " set_field_" + owner.replace('/', '_').replace('$', '_') +
"_" + name + "(threadStateData, __cn1Arg" + arg + ", __cn1ThisObject);\n";
}
public String pushFieldFromThis() {
StringBuilder b = new StringBuilder(" ");
switch(desc.charAt(0)) {
case 'L':
case '[':
b.append("PUSH_POINTER");
break;
case 'D':
b.append("PUSH_DOUBLE");
break;
case 'F':
b.append("PUSH_FLOAT");
break;
case 'J':
b.append("PUSH_LONG");
break;
default:
b.append("PUSH_INT");
break;
}
b.append("(get_field_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name);
b.append("(__cn1ThisObject));\n");
return b.toString();
}
@Override
public boolean assignTo(String varName, StringBuilder sb) {
if (opcode == Opcodes.GETSTATIC || (opcode == Opcodes.GETFIELD)) {
StringBuilder b = new StringBuilder();
if (varName != null) {
b.append(varName).append(" = ");
}
if (opcode == Opcodes.GETSTATIC) {
b.append("get_static_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name.replace('/', '_').replace('$', '_'));
b.append("(threadStateData)");
} else {
b.append("get_field_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name);
StringBuilder sb3 = new StringBuilder();
boolean targetProvided = (targetOp != null &&
targetOp instanceof AssignableExpression &&
((AssignableExpression)targetOp).assignTo(null, sb3));
if (targetProvided) {
b.append("(").append(sb3.toString().trim()).append(")");
//} else if (useThis) {
// b.append("(__cn1ThisObject)");
} else {
return false;
}
}
if (varName != null) {
b.append(";\n");
}
sb.append(b);
return true;
}
return false;
}
@Override
public void appendInstruction(StringBuilder b, List<Instruction> l) {
StringBuilder sb = new StringBuilder();
appendInstruction(sb); //To change body of generated methods, choose Tools | Templates.
if (valueOp != null && !valueOpAppended) {
valueOp.appendInstruction(b, l);
valueOpAppended = true;
}
if (targetOp != null && !targetOpAppended) {
targetOp.appendInstruction(b, l);
targetOpAppended = true;
}
b.append(sb);
}
private boolean valueOpAppended;
private boolean targetOpAppended;
@Override
public void appendInstruction(StringBuilder sbOut) {
valueOpAppended = false;
targetOpAppended = false;
StringBuilder b = new StringBuilder();
b.append(" ");
switch(opcode) {
case Opcodes.GETSTATIC:
switch(desc.charAt(0)) {
case 'L':
case '[':
b.append("PUSH_POINTER");
break;
case 'D':
b.append("PUSH_DOUBLE");
break;
case 'F':
b.append("PUSH_FLOAT");
break;
case 'J':
b.append("PUSH_LONG");
break;
default:
b.append("PUSH_INT");
break;
}
b.append("(get_static_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name.replace('/', '_').replace('$', '_'));
b.append("(threadStateData));\n");
break;
case Opcodes.PUTSTATIC: {
//b.append("SAFE_RETAIN(1);\n ");
b.append("set_static_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name.replace('/', '_').replace('$', '_'));
b.append("(threadStateData, ");
StringBuilder sb2 = new StringBuilder();
StringBuilder sb3 = new StringBuilder();
if (valueOp != null && valueOp instanceof AssignableExpression && ((AssignableExpression)valueOp).assignTo(null, sb2)) {
b.append(sb2.toString().trim()).append(");\n");
valueOpAppended = true;
} else if (valueOp != null && valueOp instanceof CustomInvoke && ((CustomInvoke)valueOp).appendExpression(sb3)) {
b.append(sb3.toString().trim()).append(");\n");
valueOpAppended = true;
} else {
switch(desc.charAt(0)) {
case 'L':
case '[':
b.append("PEEK_OBJ(1));\n SP--;\n");
sbOut.append(b);
return;
case 'D':
b.append("POP_DOUBLE");
break;
case 'F':
b.append("POP_FLOAT");
break;
case 'J':
b.append("POP_LONG");
break;
default:
b.append("POP_INT");
break;
}
b.append("());\n");
}
break;
}
case Opcodes.GETFIELD: {
StringBuilder sb3 = new StringBuilder();
boolean targetProvided = (targetOp != null &&
targetOp instanceof AssignableExpression &&
((AssignableExpression)targetOp).assignTo(null, sb3));
switch(desc.charAt(0)) {
case 'L':
case '[':
b.append("PUSH_POINTER");
break;
case 'D':
b.append("PUSH_DOUBLE");
break;
case 'F':
b.append("PUSH_FLOAT");
break;
case 'J':
b.append("PUSH_LONG");
break;
default:
b.append("PUSH_INT");
break;
}
b.append("(get_field_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name);
if (targetProvided) {
b.append("(").append(sb3.toString().trim()).append("));\n");
targetOpAppended = true;
//} else if(useThis) {
// b.append("(__cn1ThisObject));\n");
} else {
b.append("(POP_OBJ()));\n");
}
break;
}
case Opcodes.PUTFIELD: {
//b.append("SAFE_RETAIN(1);\n ");
b.append("set_field_");
b.append(owner.replace('/', '_').replace('$', '_'));
b.append("_");
b.append(name);
b.append("(threadStateData, ");
StringBuilder sb2 = new StringBuilder();
StringBuilder sb3 = new StringBuilder();
String targetLiteral = null;
String valueLiteral = null;
if (valueOp != null && valueOp instanceof AssignableExpression && ((AssignableExpression)valueOp).assignTo(null, sb2)) {
valueLiteral = sb2.toString().trim();
} else if (valueOp != null && valueOp instanceof CustomInvoke && ((CustomInvoke)valueOp).appendExpression(sb3)) {
valueLiteral = sb3.toString().trim();
}
sb3.setLength(0);
if (targetOp != null && targetOp instanceof AssignableExpression && ((AssignableExpression)targetOp).assignTo(null, sb3)) {
targetLiteral = sb3.toString().trim();
}
if (valueLiteral != null && targetLiteral != null) {
b.append(valueLiteral).append(", ").append(targetLiteral).append(");\n");
valueOpAppended = true;
targetOpAppended = true;
} else {
switch(desc.charAt(0)) {
case 'L':
case '[':
b.append("PEEK_OBJ");
//if(useThis) {
// b.append("(1), __cn1ThisObject);\n SP--;\n");
//} else {
b.append("(1), PEEK_OBJ(2));\n POP_MANY(2);\n");
//}
sbOut.append(b);
return;
case 'D':
b.append("POP_DOUBLE");
break;
case 'F':
b.append("POP_FLOAT");
break;
case 'J':
b.append("POP_LONG");
break;
default:
b.append("POP_INT");
break;
}
//if(useThis) {
// b.append("(), __cn1ThisObject);\n");
//} else {
b.append("(), POP_OBJ());\n");
//}
}
break;
}
}
if (valueOp != null && !valueOpAppended) {
valueOp.appendInstruction(sbOut);
valueOpAppended = true;
}
if (targetOp != null && !targetOpAppended) {
targetOp.appendInstruction(sbOut);
targetOpAppended = true;
}
sbOut.append(b);
}
/**
* @return the useThis
*/
//public boolean isUseThis() {
// return useThis;
//}
/**
* @param useThis the useThis to set
*/
//public void setUseThis(boolean useThis) {
// this.useThis = useThis;
//}
public static int tryReduce(List<Instruction> instructions, int index) {
Instruction instr = instructions.get(index);
if (!(instr instanceof Field)) {
return -1;
}
if (instr.getOpcode() == Opcodes.PUTFIELD) {
if (index < 2) {
return -1;
}
Field f = (Field)instr;
if (f.targetOp != null || f.valueOp != null) {
return -1;
}
Instruction targetInstr = instructions.get(index-2);
if (!(targetInstr instanceof AssignableExpression)) {
return -1;
}
Instruction valueInstr = instructions.get(index-1);
if (!(valueInstr instanceof AssignableExpression)) {
return -1;
}
StringBuilder sb = new StringBuilder();
AssignableExpression targetExpr = (AssignableExpression) targetInstr;
if (!targetExpr.assignTo(null, sb)) {
return -1;
}
AssignableExpression valueExpr = (AssignableExpression) valueInstr;
if (!valueExpr.assignTo(null, sb)) {
return -1;
}
f.targetOp = targetInstr;
f.valueOp = valueInstr;
instructions.remove(index-2);
instructions.remove(index-2);
return index-2;
} else if (instr.getOpcode() == Opcodes.PUTSTATIC) {
if (index < 1) {
return -1;
}
Field f = (Field)instr;
if (f.valueOp != null) {
return -1;
}
Instruction valueInstr = instructions.get(index-1);
if (!(valueInstr instanceof AssignableExpression)) {
return -1;
}
StringBuilder sb = new StringBuilder();
AssignableExpression valueExpr = (AssignableExpression) valueInstr;
if (!valueExpr.assignTo(null, sb)) {
return -1;
}
f.valueOp = valueInstr;
instructions.remove(index-1);
return index-1;
} else if (instr.getOpcode() == Opcodes.GETFIELD) {
if (index < 1) {
return -1;
}
Field f = (Field)instr;
//if (f.useThis) {
// return -1;
//}
Instruction targetInstr = instructions.get(index-1);
if (!(targetInstr instanceof AssignableExpression)) {
return -1;
}
StringBuilder sb = new StringBuilder();
AssignableExpression targetExpr = (AssignableExpression) targetInstr;
if (!targetExpr.assignTo(null, sb)) {
return -1;
}
f.targetOp = targetInstr;
instructions.remove(index-1);
return index-1;
}
return -1;
}
}