private void evaluateElvisOperatorExpression(ElvisOperatorExpression expression) {
MethodVisitor mv = controller.getMethodVisitor();
CompileStack compileStack = controller.getCompileStack();
OperandStack operandStack = controller.getOperandStack();
TypeChooser typeChooser = controller.getTypeChooser();
Expression boolPart = expression.getBooleanExpression().getExpression();
Expression falsePart = expression.getFalseExpression();
ClassNode truePartType = typeChooser.resolveType(boolPart, controller.getClassNode());
ClassNode falsePartType = typeChooser.resolveType(falsePart, controller.getClassNode());
ClassNode common = WideningCategories.lowestUpperBound(truePartType, falsePartType);
// x?:y is equal to x?x:y, which evals to
// var t=x; boolean(t)?t:y
// first we load x, dup it, convert the dupped to boolean, then
// jump depending on the value. For true we are done, for false we
// have to load y, thus we first remove x and then load y.
// But since x and y may have different stack lengths, this cannot work
// Thus we have to have to do the following:
// Be X the type of x, Y the type of y and S the common supertype of
// X and Y, then we have to see x?:y as
// var t=x;boolean(t)?S(t):S(y)
// so we load x, dup it, store the value in a local variable (t), then
// do boolean conversion. In the true part load t and cast it to S,
// in the false part load y and cast y to S
// load x, dup it, store one in $t and cast the remaining one to boolean
int mark = operandStack.getStackLength();
boolPart.visit(controller.getAcg());
operandStack.dup();
if (ClassHelper.isPrimitiveType(truePartType)
&& !ClassHelper.isPrimitiveType(operandStack.getTopOperand())) {
truePartType = ClassHelper.getWrapper(truePartType);
}
int retValueId = compileStack.defineTemporaryVariable("$t", truePartType, true);
operandStack.castToBool(mark, true);
Label l0 = operandStack.jump(IFEQ);
// true part: load $t and cast to S
operandStack.load(truePartType, retValueId);
operandStack.doGroovyCast(common);
Label l1 = new Label();
mv.visitJumpInsn(GOTO, l1);
// false part: load false expression and cast to S
mv.visitLabel(l0);
falsePart.visit(controller.getAcg());
operandStack.doGroovyCast(common);
// finish and cleanup
mv.visitLabel(l1);
compileStack.removeVar(retValueId);
controller.getOperandStack().replace(common, 2);
}
private void doConvertAndCast(ClassNode targetType, boolean coerce) {
int size = stack.size();
throwExceptionForNoStackElement(size, targetType, coerce);
ClassNode top = stack.get(size - 1);
targetType = targetType.redirect();
if (targetType == top) return;
if (coerce) {
controller.getInvocationWriter().coerce(top, targetType);
return;
}
boolean primTarget = ClassHelper.isPrimitiveType(targetType);
boolean primTop = ClassHelper.isPrimitiveType(top);
if (primTop && primTarget) {
// here we box and unbox to get the goal type
if (convertPrimitive(top, targetType)) {
replace(targetType);
return;
}
box();
} else if (primTop) {
// top is primitive, target is not
// so box and do groovy cast
controller.getInvocationWriter().castToNonPrimitiveIfNecessary(top, targetType);
} else if (primTarget) {
// top is not primitive so unbox
// leave that BH#doCast later
} else {
controller.getInvocationWriter().castToNonPrimitiveIfNecessary(top, targetType);
}
MethodVisitor mv = controller.getMethodVisitor();
if (primTarget
&& !ClassHelper.boolean_TYPE.equals(targetType)
&& !primTop
&& ClassHelper.getWrapper(targetType).equals(top)) {
BytecodeHelper.doCastToPrimitive(mv, top, targetType);
} else {
top = stack.get(size - 1);
if (!WideningCategories.implementsInterfaceOrSubclassOf(top, targetType)) {
BytecodeHelper.doCast(mv, targetType);
}
}
replace(targetType);
}
private void evaluateNormalTernary(TernaryExpression expression) {
MethodVisitor mv = controller.getMethodVisitor();
OperandStack operandStack = controller.getOperandStack();
TypeChooser typeChooser = controller.getTypeChooser();
Expression boolPart = expression.getBooleanExpression();
Expression truePart = expression.getTrueExpression();
Expression falsePart = expression.getFalseExpression();
ClassNode truePartType = typeChooser.resolveType(truePart, controller.getClassNode());
ClassNode falsePartType = typeChooser.resolveType(falsePart, controller.getClassNode());
ClassNode common = WideningCategories.lowestUpperBound(truePartType, falsePartType);
// we compile b?x:y as
// boolean(b)?S(x):S(y), S = common super type of x,y
// so we load b, do boolean conversion.
// In the true part load x and cast it to S,
// in the false part load y and cast y to S
// load b and convert to boolean
int mark = operandStack.getStackLength();
boolPart.visit(controller.getAcg());
operandStack.castToBool(mark, true);
Label l0 = operandStack.jump(IFEQ);
// true part: load x and cast to S
truePart.visit(controller.getAcg());
operandStack.doGroovyCast(common);
Label l1 = new Label();
mv.visitJumpInsn(GOTO, l1);
// false part: load y and cast to S
mv.visitLabel(l0);
falsePart.visit(controller.getAcg());
operandStack.doGroovyCast(common);
// finish and cleanup
mv.visitLabel(l1);
controller.getOperandStack().replace(common, 2);
}
Expression transformBinaryExpression(final BinaryExpression bin) {
if (bin instanceof DeclarationExpression) {
Expression optimized = transformDeclarationExpression(bin);
if (optimized != null) {
return optimized;
}
}
Object[] list = bin.getNodeMetaData(BINARY_EXP_TARGET);
Token operation = bin.getOperation();
int operationType = operation.getType();
Expression rightExpression = bin.getRightExpression();
Expression leftExpression = bin.getLeftExpression();
if (bin instanceof DeclarationExpression && leftExpression instanceof VariableExpression) {
ClassNode declarationType = ((VariableExpression) leftExpression).getOriginType();
if (rightExpression instanceof ConstantExpression) {
ClassNode unwrapper = ClassHelper.getUnwrapper(declarationType);
ClassNode wrapper = ClassHelper.getWrapper(declarationType);
if (!rightExpression.getType().equals(declarationType)
&& wrapper.isDerivedFrom(ClassHelper.Number_TYPE)
&& WideningCategories.isDoubleCategory(unwrapper)) {
ConstantExpression constant = (ConstantExpression) rightExpression;
if (constant.getValue() != null) {
return optimizeConstantInitialization(
bin, operation, constant, leftExpression, declarationType);
}
}
}
}
if (operationType == Types.EQUAL && leftExpression instanceof PropertyExpression) {
MethodNode directMCT =
leftExpression.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
if (directMCT != null) {
return transformPropertyAssignmentToSetterCall(
(PropertyExpression) leftExpression, rightExpression, directMCT);
}
}
if (operationType == Types.COMPARE_EQUAL || operationType == Types.COMPARE_NOT_EQUAL) {
// let's check if one of the operands is the null constant
CompareToNullExpression compareToNullExpression = null;
if (isNullConstant(leftExpression)) {
compareToNullExpression =
new CompareToNullExpression(
staticCompilationTransformer.transform(rightExpression),
operationType == Types.COMPARE_EQUAL);
} else if (isNullConstant(rightExpression)) {
compareToNullExpression =
new CompareToNullExpression(
staticCompilationTransformer.transform(leftExpression),
operationType == Types.COMPARE_EQUAL);
}
if (compareToNullExpression != null) {
compareToNullExpression.setSourcePosition(bin);
return compareToNullExpression;
}
} else if (operationType == Types.KEYWORD_IN) {
return convertInOperatorToTernary(bin, rightExpression, leftExpression);
}
if (list != null) {
if (operationType == Types.COMPARE_TO) {
StaticTypesTypeChooser typeChooser = staticCompilationTransformer.getTypeChooser();
ClassNode classNode = staticCompilationTransformer.getClassNode();
ClassNode leftType = typeChooser.resolveType(leftExpression, classNode);
if (leftType.implementsInterface(ClassHelper.COMPARABLE_TYPE)) {
ClassNode rightType = typeChooser.resolveType(rightExpression, classNode);
if (rightType.implementsInterface(ClassHelper.COMPARABLE_TYPE)) {
Expression left = staticCompilationTransformer.transform(leftExpression);
Expression right = staticCompilationTransformer.transform(rightExpression);
MethodCallExpression call =
new MethodCallExpression(left, "compareTo", new ArgumentListExpression(right));
call.setImplicitThis(false);
call.setMethodTarget(COMPARE_TO_METHOD);
CompareIdentityExpression compareIdentity = new CompareIdentityExpression(left, right);
compareIdentity.putNodeMetaData(
StaticTypesMarker.INFERRED_RETURN_TYPE, ClassHelper.boolean_TYPE);
TernaryExpression result =
new TernaryExpression(
new BooleanExpression(compareIdentity), // a==b
CONSTANT_ZERO,
new TernaryExpression(
new BooleanExpression(new CompareToNullExpression(left, true)), // a==null
CONSTANT_MINUS_ONE,
new TernaryExpression(
new BooleanExpression(
new CompareToNullExpression(right, true)), // b==null
CONSTANT_ONE,
call)));
compareIdentity.putNodeMetaData(
StaticTypesMarker.INFERRED_RETURN_TYPE, ClassHelper.int_TYPE);
result.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, ClassHelper.int_TYPE);
TernaryExpression expr = (TernaryExpression) result.getFalseExpression();
expr.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, ClassHelper.int_TYPE);
expr.getFalseExpression()
.putNodeMetaData(StaticTypesMarker.INFERRED_TYPE, ClassHelper.int_TYPE);
return result;
}
}
}
boolean isAssignment = StaticTypeCheckingSupport.isAssignment(operationType);
MethodCallExpression call;
MethodNode node = (MethodNode) list[0];
String name = (String) list[1];
Expression left = staticCompilationTransformer.transform(leftExpression);
Expression right = staticCompilationTransformer.transform(rightExpression);
BinaryExpression optimized = tryOptimizeCharComparison(left, right, bin);
if (optimized != null) {
optimized.removeNodeMetaData(BINARY_EXP_TARGET);
return transformBinaryExpression(optimized);
}
call = new MethodCallExpression(left, name, new ArgumentListExpression(right));
call.setImplicitThis(false);
call.setMethodTarget(node);
MethodNode adapter = StaticCompilationTransformer.BYTECODE_BINARY_ADAPTERS.get(operationType);
if (adapter != null) {
ClassExpression sba =
new ClassExpression(StaticCompilationTransformer.BYTECODE_ADAPTER_CLASS);
// replace with compareEquals
call =
new MethodCallExpression(sba, "compareEquals", new ArgumentListExpression(left, right));
call.setMethodTarget(adapter);
call.setImplicitThis(false);
}
if (!isAssignment) return call;
// case of +=, -=, /=, ...
// the method represents the operation type only, and we must add an assignment
return new BinaryExpression(
left, Token.newSymbol("=", operation.getStartLine(), operation.getStartColumn()), call);
}
if (bin.getOperation().getType() == Types.EQUAL
&& leftExpression instanceof TupleExpression
&& rightExpression instanceof ListExpression) {
// multiple assignment
ListOfExpressionsExpression cle = new ListOfExpressionsExpression();
boolean isDeclaration = bin instanceof DeclarationExpression;
List<Expression> leftExpressions = ((TupleExpression) leftExpression).getExpressions();
List<Expression> rightExpressions = ((ListExpression) rightExpression).getExpressions();
Iterator<Expression> leftIt = leftExpressions.iterator();
Iterator<Expression> rightIt = rightExpressions.iterator();
if (isDeclaration) {
while (leftIt.hasNext()) {
Expression left = leftIt.next();
if (rightIt.hasNext()) {
Expression right = rightIt.next();
BinaryExpression bexp = new DeclarationExpression(left, bin.getOperation(), right);
bexp.setSourcePosition(right);
cle.addExpression(bexp);
}
}
} else {
// (next, result) = [ result, next+result ]
// -->
// def tmp1 = result
// def tmp2 = next+result
// next = tmp1
// result = tmp2
int size = rightExpressions.size();
List<Expression> tmpAssignments = new ArrayList<Expression>(size);
List<Expression> finalAssignments = new ArrayList<Expression>(size);
for (int i = 0; i < Math.min(size, leftExpressions.size()); i++) {
Expression left = leftIt.next();
Expression right = rightIt.next();
VariableExpression tmpVar = new VariableExpression("$tmpVar$" + tmpVarCounter++);
BinaryExpression bexp = new DeclarationExpression(tmpVar, bin.getOperation(), right);
bexp.setSourcePosition(right);
tmpAssignments.add(bexp);
bexp = new BinaryExpression(left, bin.getOperation(), new VariableExpression(tmpVar));
bexp.setSourcePosition(left);
finalAssignments.add(bexp);
}
for (Expression tmpAssignment : tmpAssignments) {
cle.addExpression(tmpAssignment);
}
for (Expression finalAssignment : finalAssignments) {
cle.addExpression(finalAssignment);
}
}
return staticCompilationTransformer.transform(cle);
}
return staticCompilationTransformer.superTransform(bin);
}