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241 lines
8.2 KiB
241 lines
8.2 KiB
/* CreateNewConstructor Copyright (C) 1998-2002 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.Reference;
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import net.sf.jode.decompiler.MethodAnalyzer;
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import net.sf.jode.type.Type;
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public class CreateNewConstructor {
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public static boolean transform(InstructionContainer ic,
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StructuredBlock last) {
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return transformNormal(ic, last) || transformJikesString(ic, last);
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}
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static boolean transformJikesString(InstructionContainer ic,
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StructuredBlock last) {
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/* special Situation for Jikes String +=:
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*
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* PUSH new StringBuffer()
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* SWAP
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* PUSH POP.append(POP)
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*
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* We transform it to the javac String +=:
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*
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* PUSH new StringBuffer(String.valueOf(POP))
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*/
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if (!(last.outer instanceof SequentialBlock)
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|| !(ic.getInstruction() instanceof InvokeOperator))
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return false;
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InvokeOperator appendCall = (InvokeOperator) ic.getInstruction();
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if (!appendCall.getClassType().equals(Type.tStringBuffer)
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|| !appendCall.isFreeOperator(2)
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|| appendCall.isStatic()
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|| !appendCall.getMethodName().equals("append")
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|| appendCall.getMethodType().getParameterTypes().length != 1)
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return false;
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SequentialBlock sequBlock = (SequentialBlock) last.outer;
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if (!(sequBlock.outer instanceof SequentialBlock)
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|| !(sequBlock.subBlocks[0] instanceof SpecialBlock))
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return false;
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SpecialBlock swapBlock = (SpecialBlock) sequBlock.subBlocks[0];
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sequBlock = (SequentialBlock) sequBlock.outer;
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if (swapBlock.type != SpecialBlock.SWAP
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|| !(sequBlock.subBlocks[0] instanceof InstructionBlock)
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|| !(sequBlock.outer instanceof SequentialBlock))
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return false;
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InstructionBlock ib = (InstructionBlock) sequBlock.subBlocks[0];
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sequBlock = (SequentialBlock) sequBlock.outer;
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if (!(ib.getInstruction() instanceof InvokeOperator)
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|| !(sequBlock.subBlocks[0] instanceof InstructionBlock))
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return false;
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InvokeOperator constr = (InvokeOperator) ib.getInstruction();
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ib = (InstructionBlock) sequBlock.subBlocks[0];
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if (!constr.isConstructor()
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|| !constr.getClassType().equals(Type.tStringBuffer)
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|| constr.isVoid()
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|| constr.getMethodType().getParameterTypes().length != 0)
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return false;
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/* Okay everything checked. */
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MethodAnalyzer methodAna = ib.flowBlock.method;
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Expression expr = ib.getInstruction();
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Type appendType = appendCall.getMethodType().getParameterTypes()[0];
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if (!appendType.equals(Type.tString)) {
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InvokeOperator valueOf = new InvokeOperator
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(methodAna, InvokeOperator.STATIC,
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Reference.getReference("Ljava/lang/String;", "valueOf",
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"(" + appendType.getTypeSignature()
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+ ")Ljava/lang/String;"));
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expr = valueOf.addOperand(expr);
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}
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InvokeOperator newConstr = new InvokeOperator
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(methodAna, InvokeOperator.CONSTRUCTOR,
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Reference.getReference("Ljava/lang/StringBuffer;", "<init>",
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"(Ljava/lang/String;)V"));
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newConstr.makeNonVoid();
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newConstr.setSubExpressions(0, constr.getSubExpressions()[0]);
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newConstr.setSubExpressions(1, expr);
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ic.setInstruction(newConstr);
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last.replace(sequBlock);
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return true;
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}
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static boolean transformNormal(InstructionContainer ic,
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StructuredBlock last) {
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/* Situation (normal):
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*
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* new <object>
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* (optional DUP)
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* (void resolved expressions)
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* stack_n.<init>(resolved expressions)
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*
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* transform it to
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*
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* (void resolved expressions)
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* (optional PUSH) new <object>((optional: stack_n),
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* resolved expressions)
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*
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* special situation for string1 += string2:
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*
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* new <object>
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* (optional DUP)
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* (void resolved expressions)
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* PUSH load_ops
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* DUP_X2/1 <= 2 if above DUP is present
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* stack_n.<init>(stack_n, resolved expressions)
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*
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* transform it to
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*
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* (void resolved expressions)
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* PUSH load_ops
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* DUP <= remove the depth
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* (optional PUSH) new <object>(stack_n, resolved expressions)
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*/
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if (!(last.outer instanceof SequentialBlock))
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return false;
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if (!(ic.getInstruction() instanceof InvokeOperator))
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return false;
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InvokeOperator constrCall = (InvokeOperator) ic.getInstruction();
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if (!constrCall.isConstructor() || !constrCall.isVoid())
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return false;
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/* The rest should probably succeed */
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SpecialBlock optDupX2 = null;
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SequentialBlock sequBlock = (SequentialBlock) last.outer;
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Expression[] subs = constrCall.getSubExpressions();
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int opcount = constrCall.getFreeOperandCount();
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if (subs != null) {
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if (!(subs[0] instanceof NopOperator))
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return false;
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if (constrCall.getFreeOperandCount() > 1) {
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if (!(sequBlock.outer instanceof SequentialBlock)
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|| !(sequBlock.subBlocks[0] instanceof SpecialBlock))
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return false;
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optDupX2 = (SpecialBlock) sequBlock.subBlocks[0];
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sequBlock = (SequentialBlock) sequBlock.outer;
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if (optDupX2.type != SpecialBlock.DUP
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|| optDupX2.depth == 0)
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return false;
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int count = optDupX2.count;
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do {
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if (!(sequBlock.outer instanceof SequentialBlock)
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|| !(sequBlock.subBlocks[0]
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instanceof InstructionBlock))
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return false;
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Expression expr =
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((InstructionBlock)
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sequBlock.subBlocks[0]).getInstruction();
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sequBlock = (SequentialBlock) sequBlock.outer;
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if (expr.isVoid())
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continue;
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count -= expr.getType().stackSize();
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opcount--;
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} while (count > 0 && opcount > 1);
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if (count != 0)
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return false;
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}
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}
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if (opcount != 1)
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return false;
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while (sequBlock.subBlocks[0] instanceof InstructionBlock
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&& sequBlock.outer instanceof SequentialBlock) {
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Expression expr
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= ((InstructionBlock)sequBlock.subBlocks[0]).getInstruction();
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if (!expr.isVoid() || expr.getFreeOperandCount() > 0)
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break;
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sequBlock = (SequentialBlock) sequBlock.outer;
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}
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SpecialBlock dup = null;
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if (sequBlock.outer instanceof SequentialBlock
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&& sequBlock.subBlocks[0] instanceof SpecialBlock) {
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dup = (SpecialBlock) sequBlock.subBlocks[0];
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if (dup.type != SpecialBlock.DUP
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|| dup.count != 1 || dup.depth != 0)
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return false;
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sequBlock = (SequentialBlock)sequBlock.outer;
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if (optDupX2 != null && optDupX2.depth != 2)
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return false;
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} else if (optDupX2 != null && optDupX2.depth != 1)
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return false;
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if (!(sequBlock.subBlocks[0] instanceof InstructionBlock))
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return false;
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InstructionBlock block = (InstructionBlock) sequBlock.subBlocks[0];
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if (!(block.getInstruction() instanceof NewOperator))
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return false;
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NewOperator op = (NewOperator) block.getInstruction();
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if (constrCall.getClassType() != op.getType())
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return false;
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block.removeBlock();
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if (dup != null)
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dup.removeBlock();
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if (optDupX2 != null)
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optDupX2.depth = 0;
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constrCall.setSubExpressions(0, op);
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if (dup != null)
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constrCall.makeNonVoid();
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// Expression newExpr = new ConstructorOperator
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// (constrCall, dup == null);
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// if (subs != null) {
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// for (int i=subs.length; i-- > 1; )
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// newExpr = newExpr.addOperand(subs[i]);
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// }
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// ic.setInstruction(newExpr);
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return true;
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}
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}
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