You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
4.1 KiB
118 lines
4.1 KiB
/*
|
|
* CreatePostIncExpression (c) 1998 Jochen Hoenicke
|
|
*
|
|
* You may distribute under the terms of the GNU General Public License.
|
|
*
|
|
* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
|
|
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
|
|
* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
|
|
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
|
|
* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
|
|
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
package jode;
|
|
import sun.tools.java.Type;
|
|
|
|
public class CreatePostIncExpression implements Transformation {
|
|
|
|
public InstructionHeader transform(InstructionHeader ih)
|
|
{
|
|
InstructionHeader next = createLocalPostInc(ih);
|
|
if (next != null)
|
|
return next;
|
|
return createPostInc(ih);
|
|
}
|
|
|
|
public InstructionHeader createLocalPostInc(InstructionHeader ih) {
|
|
IIncOperator iinc;
|
|
int op;
|
|
Type type;
|
|
try {
|
|
Expression iincExpr = (Expression) ih.getInstruction();
|
|
iinc = (IIncOperator) iincExpr.getOperator();
|
|
if (iinc.getOperator() == iinc.ADD_OP + iinc.OPASSIGN_OP)
|
|
op = Operator.INC_OP;
|
|
else if (iinc.getOperator() == iinc.NEG_OP + iinc.OPASSIGN_OP)
|
|
op = Operator.DEC_OP;
|
|
else
|
|
return null;
|
|
if (!iinc.getValue().equals("1") &&
|
|
!iinc.getValue().equals("-1"))
|
|
return null;
|
|
if (iinc.getValue().equals("-1"))
|
|
op ^= 1;
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
Expression loadExpr = (Expression) ih.getInstruction();
|
|
LocalLoadOperator load =
|
|
(LocalLoadOperator)loadExpr.getOperator();
|
|
if (!iinc.matches(load))
|
|
return null;
|
|
|
|
type = MyType.intersection(load.getType(), MyType.tUInt);
|
|
} catch (NullPointerException ex) {
|
|
return null;
|
|
} catch (ClassCastException ex) {
|
|
return null;
|
|
}
|
|
Operator postop = new LocalPostFixOperator(type, op, iinc);
|
|
return ih.combine(2, postop);
|
|
}
|
|
|
|
public InstructionHeader createPostInc(InstructionHeader ih) {
|
|
StoreInstruction store;
|
|
int op;
|
|
Type type;
|
|
try {
|
|
store = (StoreInstruction) ih.getInstruction();
|
|
if (store.getLValueOperandCount() == 0)
|
|
return null;
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
BinaryOperator binOp = (BinaryOperator) ih.getInstruction();
|
|
if (binOp.getOperator() == store.ADD_OP)
|
|
op = Operator.INC_OP;
|
|
else if (store.getOperator() == store.NEG_OP)
|
|
op = Operator.DEC_OP;
|
|
else
|
|
return null;
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
Expression expr = (Expression) ih.getInstruction();
|
|
ConstOperator constOp = (ConstOperator) expr.getOperator();
|
|
if (!constOp.getValue().equals("1") &&
|
|
!constOp.getValue().equals("-1"))
|
|
return null;
|
|
if (constOp.getValue().equals("-1"))
|
|
op ^= 1;
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
DupOperator dup = (DupOperator) ih.getInstruction();
|
|
if (dup.getCount() != store.getLValueType().stackSize() ||
|
|
dup.getDepth() != store.getLValueOperandCount())
|
|
return null;
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
Operator load = (Operator) ih.getInstruction();
|
|
|
|
if (!store.matches(load))
|
|
return null;
|
|
|
|
ih = ih.getSimpleUniquePredecessor();
|
|
DupOperator dup2 = (DupOperator) ih.getInstruction();
|
|
if (dup2.getCount() != store.getLValueOperandCount() ||
|
|
dup2.getDepth() != 0)
|
|
return null;
|
|
|
|
type = MyType.intersection(load.getType(), store.getLValueType());
|
|
} catch (NullPointerException ex) {
|
|
return null;
|
|
} catch (ClassCastException ex) {
|
|
return null;
|
|
}
|
|
Operator postop = new PostFixOperator(type, op, store);
|
|
return ih.combine(6, postop);
|
|
}
|
|
}
|
|
|