Java tutorial
/* * 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; } }