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8024130: We no longer need slots for temporaries in self-assign indices

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Reviewed-by: jlaskey, lagergren
This commit is contained in:
Attila Szegedi 2013-09-11 10:27:25 +02:00
parent 12d6f7df9b
commit ab77668a9a
1 changed files with 3 additions and 37 deletions
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40
nashorn/src/jdk/nashorn/internal/codegen/Attr.java
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@ -886,10 +886,9 @@ final class Attr extends NodeOperatorVisitor<LexicalContext> {
@Override
public Node leaveDECINC(final UnaryNode unaryNode) {
// @see assignOffset
final UnaryNode newUnaryNode = unaryNode.setRHS(ensureAssignmentSlots(unaryNode.rhs()));
final Type type = arithType();
newType(newUnaryNode.rhs().getSymbol(), type);
return end(ensureSymbol(type, newUnaryNode));
newType(unaryNode.rhs().getSymbol(), type);
return end(ensureSymbol(type, unaryNode));
}
@Override
@ -1574,39 +1573,6 @@ final class Attr extends NodeOperatorVisitor<LexicalContext> {
return newInternal(lc.getCurrentFunction().uniqueName(EXCEPTION_PREFIX.symbolName()), Type.typeFor(EXCEPTION_PREFIX.type()));
}
/**
* In an assignment, recursively make sure that there are slots for
* everything that has to be laid out as temporary storage, which is the
* case if we are assign-op:ing a BaseNode subclass. This has to be
* recursive to handle things like multi dimensional arrays as lhs
*
* see NASHORN-258
*
* @param assignmentDest the destination node of the assignment, e.g. lhs for binary nodes
*/
private Expression ensureAssignmentSlots(final Expression assignmentDest) {
final LexicalContext attrLexicalContext = lc;
return (Expression)assignmentDest.accept(new NodeVisitor<LexicalContext>(new LexicalContext()) {
@Override
public Node leaveIndexNode(final IndexNode indexNode) {
assert indexNode.getSymbol().isTemp();
final Expression index = indexNode.getIndex();
//only temps can be set as needing slots. the others will self resolve
//it is illegal to take a scope var and force it to be a slot, that breaks
Symbol indexSymbol = index.getSymbol();
if (indexSymbol.isTemp() && !indexSymbol.isConstant() && !indexSymbol.hasSlot()) {
if(indexSymbol.isShared()) {
indexSymbol = temporarySymbols.createUnshared(indexSymbol);
}
indexSymbol.setNeedsSlot(true);
attrLexicalContext.getCurrentBlock().putSymbol(attrLexicalContext, indexSymbol);
return indexNode.setIndex(index.setSymbol(attrLexicalContext, indexSymbol));
}
return indexNode;
}
});
}
/**
* Return the type that arithmetic ops should use. Until we have implemented better type
* analysis (range based) or overflow checks that are fast enough for int arithmetic,
@ -1704,7 +1670,7 @@ final class Attr extends NodeOperatorVisitor<LexicalContext> {
newType(lhs.getSymbol(), destType); //may not narrow if dest is already wider than destType
// ensureSymbol(destType, binaryNode); //for OP= nodes, the node can carry a narrower types than its lhs rhs. This is perfectly fine
return end(ensureSymbol(destType, ensureAssignmentSlots(binaryNode)));
return end(ensureSymbol(destType, binaryNode));
}
private Expression ensureSymbol(final Type type, final Expression expr) {