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string += implemented

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git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@92 379699f6-c40d-0410-875b-85095c16579e
stable
jochen 27 years ago
parent 58142d1683
commit c25af54827
1 changed files with 117 additions and 78 deletions
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  1. 195
      jode/jode/flow/CreateAssignExpression.java

195
jode/jode/flow/CreateAssignExpression.java
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@ -23,108 +23,147 @@ import jode.*;
public class CreateAssignExpression implements Transformation{
public boolean transform(FlowBlock flow) {
if (!(flow.lastModified instanceof InstructionContainer)
|| !(flow.lastModified.outer instanceof SequentialBlock)
|| !(((InstructionContainer)flow.lastModified).getInstruction()
instanceof StoreInstruction)
|| !(((InstructionContainer)flow.lastModified).getInstruction()
.isVoid()))
return false;
return (createAssignOp(flow) || createAssignExpression(flow));
}
public boolean createAssignOp(FlowBlock flow) {
Expression rightHandSide;
StoreInstruction store;
BinaryOperator binop;
InstructionContainer lastBlock;
SequentialBlock opBlock;
SequentialBlock sequBlock;
boolean isExpression = false;
try {
InstructionBlock ib;
lastBlock = (InstructionContainer) flow.lastModified;
store = (StoreInstruction) lastBlock.getInstruction();
opBlock = (SequentialBlock) lastBlock.outer;
if (opBlock.subBlocks[1] != lastBlock)
/* Situation:
*
* (push loadstoreOps) <- not checked
* sequBlock:
* dup
* opBlock:
* load(stack) * rightHandSide
* (optional dup_x)
* store(stack)
*
* We transform it to:
* (push loadstoreOps)
* rightHandSide
* store(stack) *= (stack)
*
* If the optional dup is present the store*= becomes non void.
*/
InstructionContainer lastBlock
= (InstructionContainer) flow.lastModified;
SequentialBlock opBlock = (SequentialBlock) lastBlock.outer;
StoreInstruction store
= (StoreInstruction) lastBlock.getInstruction();
boolean isAssignOp = false;
if (opBlock.subBlocks[0] instanceof SpecialBlock) {
SpecialBlock dup = (SpecialBlock) opBlock.subBlocks[0];
if (dup.type != SpecialBlock.DUP
|| dup.depth != store.getLValueOperandCount()
|| dup.count != store.getLValueType().stackSize()
|| !(opBlock.outer instanceof SequentialBlock))
return false;
opBlock = (SequentialBlock) opBlock.outer;
isAssignOp = true;
}
if (opBlock.subBlocks[0] instanceof SpecialBlock) {
SpecialBlock dup = (SpecialBlock) opBlock.subBlocks[0];
if (dup.type != SpecialBlock.DUP
|| dup.depth != store.getLValueOperandCount()
|| dup.count != store.getLValueType().stackSize())
return false;
opBlock = (SequentialBlock) lastBlock.outer;
isExpression = true;
}
if (!(opBlock.subBlocks[0] instanceof InstructionBlock))
return false;
ib = (InstructionBlock) opBlock.subBlocks[0];
ComplexExpression binopExpr =
(ComplexExpression) ib.getInstruction();
binop = (BinaryOperator) binopExpr.getOperator();
if (binop.getOperatorIndex() < binop.ADD_OP ||
binop.getOperatorIndex() >= binop.ASSIGN_OP)
return false;
InstructionBlock ib = (InstructionBlock) opBlock.subBlocks[0];
if (!(opBlock.outer instanceof SequentialBlock)
|| !(opBlock.outer.getSubBlocks()[0] instanceof SpecialBlock))
return false;
rightHandSide = binopExpr.getSubExpressions()[1];
if (rightHandSide.isVoid())
return false; /* XXX */
SequentialBlock sequBlock = (SequentialBlock) opBlock.outer;
SpecialBlock dup = (SpecialBlock) sequBlock.subBlocks[0];
if (dup.type != SpecialBlock.DUP
|| dup.depth != 0
|| dup.count != store.getLValueOperandCount())
return false;
Operator load = (Operator) binopExpr.getSubExpressions()[0];
if (!store.matches(load))
return false;
if (!(ib.getInstruction() instanceof ComplexExpression))
return false;
ComplexExpression expr = (ComplexExpression) ib.getInstruction();
sequBlock = (SequentialBlock) opBlock.outer;
int opIndex;
Expression rightHandSide;
SpecialBlock dup = (SpecialBlock) sequBlock.subBlocks[0];
if (dup.type != SpecialBlock.DUP
|| dup.depth != 0
|| dup.count != store.getLValueOperandCount())
if (expr.getOperator() instanceof BinaryOperator) {
BinaryOperator binop = (BinaryOperator) expr.getOperator();
opIndex = binop.getOperatorIndex();
if (opIndex < binop.ADD_OP || opIndex >= binop.ASSIGN_OP
|| !(expr.getSubExpressions()[0] instanceof Operator)
|| !store.matches((Operator) expr.getSubExpressions()[0]))
return false;
} catch (ClassCastException ex) {
return false;
} catch (NullPointerException ex) {
return false;
rightHandSide = expr.getSubExpressions()[1];
} else {
Expression simple = expr.simplifyString();
rightHandSide = simple;
/* Now search for the leftmost operand ... */
ComplexExpression last = null;
while (simple instanceof ComplexExpression
&& simple.getOperator() instanceof StringAddOperator) {
last = (ComplexExpression) simple;
simple = last.getSubExpressions()[0];
}
/* ... check it ... */
if (last == null || !(simple instanceof Operator)
|| !store.matches((Operator) simple))
return false;
/* ... and remove it. */
if (last.getParent() != null) {
((ComplexExpression)last.getParent()).getSubExpressions()[0]
= last.getSubExpressions()[1];
} else
rightHandSide = last.getSubExpressions()[1];
opIndex = Operator.ADD_OP;
}
((InstructionBlock)opBlock.subBlocks[0])
.setInstruction(rightHandSide);
opBlock.moveDefinitions(sequBlock, opBlock);
opBlock.replace(sequBlock);
store.setOperatorIndex(store.OPASSIGN_OP+binop.getOperatorIndex());
store.setLValueType(binop.getType()
.intersection(store.getLValueType()));
if (isExpression)
lastBlock.setInstruction
(new AssignOperator(store.getOperatorIndex(), store));
else
lastBlock.setInstruction(store);
lastBlock.moveDefinitions(opBlock.subBlocks[1], lastBlock);
dup.removeBlock();
ib.setInstruction(rightHandSide);
store.setOperatorIndex(store.OPASSIGN_OP+opIndex);
if (isAssignOp)
store.makeNonVoid();
lastBlock.replace(opBlock.subBlocks[1]);
return true;
}
public boolean createAssignExpression(FlowBlock flow) {
StoreInstruction store;
InstructionContainer lastBlock;
SequentialBlock sequBlock;
try {
lastBlock = (InstructionContainer) flow.lastModified;
store = (StoreInstruction) lastBlock.getInstruction();
sequBlock = (SequentialBlock) lastBlock.outer;
/* Situation:
* sequBlock:
* dup_X(lvalue_count)
* store instruction
*/
InstructionContainer lastBlock
= (InstructionContainer) flow.lastModified;
SequentialBlock sequBlock = (SequentialBlock) lastBlock.outer;
StoreInstruction store = (StoreInstruction) lastBlock.getInstruction();
if (sequBlock.subBlocks[0] instanceof SpecialBlock) {
SpecialBlock dup = (SpecialBlock) sequBlock.subBlocks[0];
if (dup.type != SpecialBlock.DUP
|| dup.depth != store.getLValueOperandCount()
|| dup.count != store.getLValueType().stackSize())
return false;
} catch (NullPointerException ex) {
return false;
} catch (ClassCastException ex) {
return false;
dup.removeBlock();
store.makeNonVoid();
return true;
}
lastBlock.setInstruction
(new AssignOperator(store.getOperatorIndex(), store));
lastBlock.moveDefinitions(sequBlock, lastBlock);
lastBlock.replace(sequBlock);
return true;
return false;
}
}

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