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 com.codename1.tools.translator.BytecodeMethod; import org.objectweb.asm.Opcodes; /** * * @author Shai Almog */ public class VarOp extends Instruction implements AssignableExpression { private int var; public VarOp(int opcode, int var) { super(opcode); this.var = var; } public int getIndex() { return var; } @Override public boolean assignTo(String varName, StringBuilder sb) { StringBuilder b = new StringBuilder(); /* if (typeVarName != null) { switch (opcode) { case Opcodes.ALOAD: b.append("locals["); b.append(var); b.append("].type = CN1_TYPE_OBJECT; "); break; } }*/ if (varName != null) { b.append(" "); b.append(varName).append(" = "); } switch (opcode) { case Opcodes.ILOAD: b.append("ilocals_"); b.append(var); b.append("_"); break; case Opcodes.LLOAD: b.append("llocals_"); b.append(var); b.append("_"); break; case Opcodes.FLOAD: b.append("flocals_"); b.append(var); b.append("_"); break; case Opcodes.DLOAD: b.append("dlocals_"); b.append(var); b.append("_"); break; case Opcodes.ALOAD: if (getMethod() != null && !getMethod().isStatic() && var == 0) { b.append("__cn1ThisObject"); } else { b.append("locals["); b.append(var); b.append("].data.o"); } break; default: return false; } if (varName != null) { b.append(";\n"); } sb.append(b); return true; } public boolean assignFrom(AssignableExpression ex, StringBuilder b) { b.append(" /* VarOp.assignFrom */ "); switch (opcode) { case Opcodes.ISTORE: return ex.assignTo("ilocals_" + var + "_", b); case Opcodes.LSTORE: return ex.assignTo("llocals_" + var + "_", b); case Opcodes.FSTORE: return ex.assignTo("flocals_" + var + "_", b); case Opcodes.DSTORE: return ex.assignTo("dlocals_" + var + "_", b); case Opcodes.ASTORE: { StringBuilder sb = new StringBuilder(); sb.append("locals[").append(var).append("].type=CN1_TYPE_INVALID;"); boolean res = ex.assignTo("locals[" + var + "].data.o", sb); if (!res) { return false; } sb.append("locals[").append(var).append("].type=CN1_TYPE_OBJECT;"); b.append(sb); return true; } } b.append("\n"); return false; } public boolean assignFrom(CustomInvoke ex, StringBuilder b) { b.append(" /* VarOp.assignFrom */ "); StringBuilder sb = new StringBuilder(); switch (opcode) { case Opcodes.ISTORE: if (ex.appendExpression(sb)) { b.append("ilocals_").append(var).append("_ = ").append(sb.toString().trim()).append(";\n"); return true; } break; case Opcodes.LSTORE: if (ex.appendExpression(sb)) { b.append("llocals_").append(var).append("_ = ").append(sb.toString().trim()).append(";\n"); return true; } break; case Opcodes.FSTORE: if (ex.appendExpression(sb)) { b.append("flocals_").append(var).append("_ = ").append(sb.toString().trim()).append(";\n"); return true; } break; case Opcodes.DSTORE: if (ex.appendExpression(sb)) { b.append("dlocals_").append(var).append("_ = ").append(sb.toString().trim()).append(";\n"); return true; } break; case Opcodes.ASTORE: { StringBuilder sb2 = new StringBuilder(); //sb2.append("locals[").append(var).append("].type=CN1_TYPE_INVALID; "); if (ex.appendExpression(sb)) { sb2.append("locals[").append(var).append("].data.o = ").append(sb.toString().trim()).append(";"); sb2.append("locals[").append(var).append("].type=CN1_TYPE_OBJECT;"); b.append(sb2); return true; } break; } } //b.append("\n"); return false; } @Override public void appendInstruction(StringBuilder b) { b.append(" "); switch (opcode) { case Opcodes.ILOAD: b.append("(*SP).type = CN1_TYPE_INT; /* ILOAD */ \n" + " (*SP).data.i = ilocals_"); b.append(var); b.append("_; \n SP++;\n"); return; case Opcodes.LLOAD: b.append("BC_LLOAD("); break; case Opcodes.FLOAD: b.append("BC_FLOAD("); break; case Opcodes.DLOAD: b.append("BC_DLOAD("); break; case Opcodes.ALOAD: b.append("BC_ALOAD("); break; case Opcodes.ISTORE: b.append("BC_ISTORE("); break; case Opcodes.LSTORE: b.append("BC_LSTORE("); break; case Opcodes.FSTORE: b.append("BC_FSTORE("); break; case Opcodes.DSTORE: b.append("BC_DSTORE("); break; case Opcodes.ASTORE: b.append("BC_ASTORE("); break; case Opcodes.RET: b.append("/* RET TODO */"); //b.append("goto label_"); //b.append(var); //b.append("; /* RET */\n"); return; case Opcodes.SIPUSH: case Opcodes.BIPUSH: b.append("PUSH_INT("); break; case Opcodes.NEWARRAY: switch (var) { case 4: // boolean b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_BOOLEAN, sizeof(JAVA_ARRAY_BOOLEAN), 1));\n"); break; case 5: // char b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_CHAR, sizeof(JAVA_ARRAY_CHAR), 1));\n"); break; case 6: // float b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_FLOAT, sizeof(JAVA_ARRAY_FLOAT), 1));\n"); break; case 7: // double b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_DOUBLE, sizeof(JAVA_ARRAY_DOUBLE), 1));\n"); break; case 8: // byte b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_BYTE, sizeof(JAVA_ARRAY_BYTE), 1));\n"); break; case 9: // short b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_SHORT, sizeof(JAVA_ARRAY_SHORT), 1));\n"); break; case 10: // int b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_INT, sizeof(JAVA_ARRAY_INT), 1));\n"); break; case 11: // long b.append( "PUSH_OBJ(allocArray(threadStateData, POP_INT(), &class_array1__JAVA_LONG, sizeof(JAVA_ARRAY_LONG), 1));\n"); break; } return; default: throw new RuntimeException("Missing opcode: " + opcode); } b.append(var); b.append(");\n"); } }