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87 lines
2.9 KiB
87 lines
2.9 KiB
/* CreateClassField Copyright (C) 1999-2002 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; see the file COPYING.LESSER. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.flow;
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import net.sf.jode.expr.*;
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import net.sf.jode.bytecode.ClassPath;
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import net.sf.jode.type.Type;
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public class CreateClassField {
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public static boolean transform(IfThenElseBlock ifBlock,
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StructuredBlock last) {
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// convert
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// if (class$classname == null)
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// class$classname = class$("java.lang.Object");
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// to
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// if (classname.class == null) {
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// }
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if (!(ifBlock.cond instanceof CompareUnaryOperator)
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|| !(((Operator)ifBlock.cond)
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.getOperatorIndex() == Operator.EQUALS_OP)
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|| !(ifBlock.thenBlock instanceof InstructionBlock)
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|| ifBlock.elseBlock != null)
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return false;
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if (ifBlock.thenBlock.jump != null
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&& (ifBlock.jump == null
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|| (ifBlock.jump.destination
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!= ifBlock.thenBlock.jump.destination)))
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return false;
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CompareUnaryOperator cmp = (CompareUnaryOperator) ifBlock.cond;
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Expression instr =
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((InstructionBlock)ifBlock.thenBlock).getInstruction();
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if (!(cmp.getSubExpressions()[0] instanceof GetFieldOperator)
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|| !(instr instanceof StoreInstruction))
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return false;
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StoreInstruction store = (StoreInstruction) instr;
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if (!(store.getLValue() instanceof PutFieldOperator))
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return false;
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PutFieldOperator put = (PutFieldOperator) store.getLValue();
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if (put.getField() == null
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|| !put.matches((GetFieldOperator)cmp.getSubExpressions()[0])
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|| !(store.getSubExpressions()[1] instanceof InvokeOperator))
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return false;
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InvokeOperator invoke = (InvokeOperator) store.getSubExpressions()[1];
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if (!invoke.isGetClass())
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return false;
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Expression param = invoke.getSubExpressions()[0];
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if (param instanceof ConstOperator
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&& ((ConstOperator)param).getValue() instanceof String) {
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String clazz = (String) ((ConstOperator)param).getValue();
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if (put.getField().setClassConstant(clazz)) {
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ClassPath cp = invoke.getClassPath();
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cmp.setSubExpressions
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(0, new ClassFieldOperator(clazz.charAt(0) == '['
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? Type.tType(cp, clazz)
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: Type.tClass(cp, clazz)));
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EmptyBlock empty = new EmptyBlock();
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empty.moveJump(ifBlock.thenBlock.jump);
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ifBlock.setThenBlock(empty);
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return true;
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}
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}
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return false;
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}
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}
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