private VariableSlotLoader loadWithSubscript(Expression expression) {
final OperandStack operandStack = controller.getOperandStack();
// if we have a BinaryExpression, let us check if it is with
// subscription
if (expression instanceof BinaryExpression) {
BinaryExpression be = (BinaryExpression) expression;
if (be.getOperation().getType() == Types.LEFT_SQUARE_BRACKET) {
// right expression is the subscript expression
// we store the result of the subscription on the stack
Expression subscript = be.getRightExpression();
subscript.visit(controller.getAcg());
ClassNode subscriptType = operandStack.getTopOperand();
int id =
controller.getCompileStack().defineTemporaryVariable("$subscript", subscriptType, true);
VariableSlotLoader subscriptExpression =
new VariableSlotLoader(subscriptType, id, operandStack);
// do modified visit
BinaryExpression newBe =
new BinaryExpression(be.getLeftExpression(), be.getOperation(), subscriptExpression);
newBe.copyNodeMetaData(be);
newBe.setSourcePosition(be);
newBe.visit(controller.getAcg());
return subscriptExpression;
}
}
// normal loading of expression
expression.visit(controller.getAcg());
return null;
}
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);
}
public static void loadReference(String name, WriterController controller) {
CompileStack compileStack = controller.getCompileStack();
MethodVisitor mv = controller.getMethodVisitor();
ClassNode classNode = controller.getClassNode();
AsmClassGenerator acg = controller.getAcg();
// compileStack.containsVariable(name) means to ask if the variable is already declared
// compileStack.getScope().isReferencedClassVariable(name) means to ask if the variable is a
// field
// If it is no field and is not yet declared, then it is either a closure shared variable or
// an already declared variable.
if (!compileStack.containsVariable(name)
&& compileStack.getScope().isReferencedClassVariable(name)) {
acg.visitFieldExpression(new FieldExpression(classNode.getDeclaredField(name)));
} else {
BytecodeVariable v =
compileStack.getVariable(name, !classNodeUsesReferences(controller.getClassNode()));
if (v == null) {
// variable is not on stack because we are
// inside a nested Closure and this variable
// was not used before
// then load it from the Closure field
FieldNode field = classNode.getDeclaredField(name);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(
GETFIELD,
controller.getInternalClassName(),
name,
BytecodeHelper.getTypeDescription(field.getType()));
} else {
mv.visitVarInsn(ALOAD, v.getIndex());
}
controller.getOperandStack().push(ClassHelper.REFERENCE_TYPE);
}
}
protected void evaluateCompareExpression(
MethodCaller compareMethod, BinaryExpression expression) {
Expression leftExp = expression.getLeftExpression();
TypeChooser typeChooser = controller.getTypeChooser();
ClassNode cn = controller.getClassNode();
ClassNode leftType = typeChooser.resolveType(leftExp, cn);
Expression rightExp = expression.getRightExpression();
ClassNode rightType = typeChooser.resolveType(rightExp, cn);
boolean done = false;
if (ClassHelper.isPrimitiveType(leftType) && ClassHelper.isPrimitiveType(rightType)) {
BinaryExpressionMultiTypeDispatcher helper =
new BinaryExpressionMultiTypeDispatcher(getController());
done = helper.doPrimitiveCompare(leftType, rightType, expression);
}
if (!done) {
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
leftExp.visit(acg);
operandStack.box();
rightExp.visit(acg);
operandStack.box();
compareMethod.call(controller.getMethodVisitor());
ClassNode resType = ClassHelper.boolean_TYPE;
if (compareMethod == findRegexMethod) {
resType = ClassHelper.OBJECT_TYPE;
}
operandStack.replace(resType, 2);
}
}
public boolean addGeneratedClosureConstructorCall(ConstructorCallExpression call) {
ClassNode classNode = controller.getClassNode();
if (!classNode.declaresInterface(ClassHelper.GENERATED_CLOSURE_Type)) return false;
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
MethodVisitor mv = controller.getMethodVisitor();
mv.visitVarInsn(ALOAD, 0);
ClassNode callNode = classNode.getSuperClass();
TupleExpression arguments = (TupleExpression) call.getArguments();
if (arguments.getExpressions().size() != 2)
throw new GroovyBugError(
"expected 2 arguments for closure constructor super call, but got"
+ arguments.getExpressions().size());
arguments.getExpression(0).visit(acg);
operandStack.box();
arguments.getExpression(1).visit(acg);
operandStack.box();
// TODO: replace with normal String, p not needed
Parameter p = new Parameter(ClassHelper.OBJECT_TYPE, "_p");
String descriptor =
BytecodeHelper.getMethodDescriptor(ClassHelper.VOID_TYPE, new Parameter[] {p, p});
mv.visitMethodInsn(
INVOKESPECIAL, BytecodeHelper.getClassInternalName(callNode), "<init>", descriptor, false);
operandStack.remove(2);
return true;
}
public ClassNode getOrAddClosureClass(ClosureExpression expression, int mods) {
ClassNode closureClass = closureClassMap.get(expression);
if (closureClass == null) {
closureClass = createClosureClass(expression, mods);
closureClassMap.put(expression, closureClass);
controller.getAcg().addInnerClass(closureClass);
closureClass.addInterface(ClassHelper.GENERATED_CLOSURE_Type);
closureClass.putNodeMetaData(WriterControllerFactory.class, factory);
}
return closureClass;
}
public void pushDynamicName(Expression name) {
if (name instanceof ConstantExpression) {
ConstantExpression ce = (ConstantExpression) name;
Object value = ce.getValue();
if (value instanceof String) {
pushConstant(ce);
return;
}
}
new CastExpression(ClassHelper.STRING_TYPE, name).visit(controller.getAcg());
}
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);
}
public void writeClosure(ClosureExpression expression) {
CompileStack compileStack = controller.getCompileStack();
MethodVisitor mv = controller.getMethodVisitor();
ClassNode classNode = controller.getClassNode();
AsmClassGenerator acg = controller.getAcg();
// generate closure as public class to make sure it can be properly invoked by classes of the
// Groovy runtime without circumventing JVM access checks (see CachedMethod for example).
ClassNode closureClass = getOrAddClosureClass(expression, ACC_PUBLIC);
String closureClassinternalName = BytecodeHelper.getClassInternalName(closureClass);
List constructors = closureClass.getDeclaredConstructors();
ConstructorNode node = (ConstructorNode) constructors.get(0);
Parameter[] localVariableParams = node.getParameters();
mv.visitTypeInsn(NEW, closureClassinternalName);
mv.visitInsn(DUP);
if (controller.isStaticMethod() || compileStack.isInSpecialConstructorCall()) {
(new ClassExpression(classNode)).visit(acg);
(new ClassExpression(controller.getOutermostClass())).visit(acg);
} else {
mv.visitVarInsn(ALOAD, 0);
controller.getOperandStack().push(ClassHelper.OBJECT_TYPE);
loadThis();
}
// now let's load the various parameters we're passing
// we start at index 2 because the first variable we pass
// is the owner instance and at this point it is already
// on the stack
for (int i = 2; i < localVariableParams.length; i++) {
Parameter param = localVariableParams[i];
String name = param.getName();
loadReference(name, controller);
if (param.getNodeMetaData(ClosureWriter.UseExistingReference.class) == null) {
param.setNodeMetaData(ClosureWriter.UseExistingReference.class, Boolean.TRUE);
}
}
// we may need to pass in some other constructors
// cv.visitMethodInsn(INVOKESPECIAL, innerClassinternalName, "<init>", prototype + ")V");
mv.visitMethodInsn(
INVOKESPECIAL,
closureClassinternalName,
"<init>",
BytecodeHelper.getMethodDescriptor(ClassHelper.VOID_TYPE, localVariableParams),
false);
controller.getOperandStack().replace(ClassHelper.CLOSURE_TYPE, localVariableParams.length);
}
private void evaluateCompareTo(BinaryExpression expression) {
Expression leftExpression = expression.getLeftExpression();
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
leftExpression.visit(acg);
operandStack.box();
// if the right hand side is a boolean expression, we need to autobox
Expression rightExpression = expression.getRightExpression();
rightExpression.visit(acg);
operandStack.box();
compareToMethod.call(controller.getMethodVisitor());
operandStack.replace(ClassHelper.Integer_TYPE, 2);
}
private void evaluateInstanceof(BinaryExpression expression) {
OperandStack operandStack = controller.getOperandStack();
expression.getLeftExpression().visit(controller.getAcg());
operandStack.box();
Expression rightExp = expression.getRightExpression();
ClassNode classType;
if (rightExp instanceof ClassExpression) {
ClassExpression classExp = (ClassExpression) rightExp;
classType = classExp.getType();
} else {
throw new RuntimeException(
"Right hand side of the instanceof keyword must be a class name, not: " + rightExp);
}
String classInternalName = BytecodeHelper.getClassInternalName(classType);
controller.getMethodVisitor().visitTypeInsn(INSTANCEOF, classInternalName);
operandStack.replace(ClassHelper.boolean_TYPE);
}
private void evaluateLogicalAndExpression(BinaryExpression expression) {
MethodVisitor mv = controller.getMethodVisitor();
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
expression.getLeftExpression().visit(acg);
operandStack.doGroovyCast(ClassHelper.boolean_TYPE);
Label falseCase = operandStack.jump(IFEQ);
expression.getRightExpression().visit(acg);
operandStack.doGroovyCast(ClassHelper.boolean_TYPE);
operandStack.jump(IFEQ, falseCase);
ConstantExpression.PRIM_TRUE.visit(acg);
Label trueCase = new Label();
mv.visitJumpInsn(GOTO, trueCase);
mv.visitLabel(falseCase);
ConstantExpression.PRIM_FALSE.visit(acg);
mv.visitLabel(trueCase);
operandStack.remove(1); // have to remove 1 because of the GOTO
}
protected void evaluateBinaryExpressionWithAssignment(
String method, BinaryExpression expression) {
Expression leftExpression = expression.getLeftExpression();
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
if (leftExpression instanceof BinaryExpression) {
BinaryExpression leftBinExpr = (BinaryExpression) leftExpression;
if (leftBinExpr.getOperation().getType() == Types.LEFT_SQUARE_BRACKET) {
evaluateArrayAssignmentWithOperator(method, expression, leftBinExpr);
return;
}
}
evaluateBinaryExpression(method, expression);
// br to leave a copy of rvalue on the stack. see also isPopRequired()
operandStack.dup();
controller.getCompileStack().pushLHS(true);
leftExpression.visit(acg);
controller.getCompileStack().popLHS();
}
protected void assignToArray(
Expression parent, Expression receiver, Expression index, Expression rhsValueLoader) {
// let's replace this assignment to a subscript operator with a
// method call
// e.g. x[5] = 10
// -> (x, [], 5), =, 10
// -> methodCall(x, "putAt", [5, 10])
ArgumentListExpression ae = new ArgumentListExpression(index, rhsValueLoader);
controller
.getInvocationWriter()
.makeCall(
parent,
receiver,
new ConstantExpression("putAt"),
ae,
InvocationWriter.invokeMethod,
false,
false,
false);
controller.getOperandStack().pop();
// return value of assignment
rhsValueLoader.visit(controller.getAcg());
}
private void execMethodAndStoreForSubscriptOperator(
int op,
String method,
Expression expression,
VariableSlotLoader usesSubscript,
Expression orig) {
final OperandStack operandStack = controller.getOperandStack();
writePostOrPrefixMethod(op, method, expression, orig);
// we need special code for arrays to store the result (like for a[1]++)
if (usesSubscript != null) {
CompileStack compileStack = controller.getCompileStack();
BinaryExpression be = (BinaryExpression) expression;
ClassNode methodResultType = operandStack.getTopOperand();
final int resultIdx =
compileStack.defineTemporaryVariable("postfix_" + method, methodResultType, true);
BytecodeExpression methodResultLoader =
new VariableSlotLoader(methodResultType, resultIdx, operandStack);
// execute the assignment, this will leave the right side
// (here the method call result) on the stack
assignToArray(be, be.getLeftExpression(), usesSubscript, methodResultLoader);
compileStack.removeVar(resultIdx);
}
// here we handle a.b++ and a++
else if (expression instanceof VariableExpression
|| expression instanceof FieldExpression
|| expression instanceof PropertyExpression) {
operandStack.dup();
controller.getCompileStack().pushLHS(true);
expression.visit(controller.getAcg());
controller.getCompileStack().popLHS();
}
// other cases don't need storing, so nothing to be done for them
}
private void evaluateLogicalOrExpression(BinaryExpression expression) {
MethodVisitor mv = controller.getMethodVisitor();
AsmClassGenerator acg = controller.getAcg();
OperandStack operandStack = controller.getOperandStack();
Label end = new Label();
expression.getLeftExpression().visit(acg);
operandStack.doGroovyCast(ClassHelper.boolean_TYPE);
Label trueCase = operandStack.jump(IFNE);
expression.getRightExpression().visit(acg);
operandStack.doGroovyCast(ClassHelper.boolean_TYPE);
Label falseCase = operandStack.jump(IFEQ);
mv.visitLabel(trueCase);
ConstantExpression.PRIM_TRUE.visit(acg);
operandStack.jump(GOTO, end);
mv.visitLabel(falseCase);
ConstantExpression.PRIM_FALSE.visit(acg);
mv.visitLabel(end);
}
public void evaluateEqual(BinaryExpression expression, boolean defineVariable) {
AsmClassGenerator acg = controller.getAcg();
CompileStack compileStack = controller.getCompileStack();
OperandStack operandStack = controller.getOperandStack();
Expression rightExpression = expression.getRightExpression();
Expression leftExpression = expression.getLeftExpression();
ClassNode lhsType =
controller.getTypeChooser().resolveType(leftExpression, controller.getClassNode());
if (defineVariable
&& rightExpression instanceof EmptyExpression
&& !(leftExpression instanceof TupleExpression)) {
VariableExpression ve = (VariableExpression) leftExpression;
BytecodeVariable var =
compileStack.defineVariable(
ve, controller.getTypeChooser().resolveType(ve, controller.getClassNode()), false);
operandStack.loadOrStoreVariable(var, false);
return;
}
// let's evaluate the RHS and store the result
ClassNode rhsType;
if (rightExpression instanceof ListExpression && lhsType.isArray()) {
ListExpression list = (ListExpression) rightExpression;
ArrayExpression array =
new ArrayExpression(lhsType.getComponentType(), list.getExpressions());
array.setSourcePosition(list);
array.visit(acg);
} else if (rightExpression instanceof EmptyExpression) {
rhsType = leftExpression.getType();
loadInitValue(rhsType);
} else {
rightExpression.visit(acg);
}
rhsType = operandStack.getTopOperand();
boolean directAssignment = defineVariable && !(leftExpression instanceof TupleExpression);
int rhsValueId;
if (directAssignment) {
VariableExpression var = (VariableExpression) leftExpression;
if (var.isClosureSharedVariable() && ClassHelper.isPrimitiveType(rhsType)) {
// GROOVY-5570: if a closure shared variable is a primitive type, it must be boxed
rhsType = ClassHelper.getWrapper(rhsType);
operandStack.box();
}
// ensure we try to unbox null to cause a runtime NPE in case we assign
// null to a primitive typed variable, even if it is used only in boxed
// form as it is closure shared
if (var.isClosureSharedVariable()
&& ClassHelper.isPrimitiveType(var.getOriginType())
&& isNull(rightExpression)) {
operandStack.doGroovyCast(var.getOriginType());
// these two are never reached in bytecode and only there
// to avoid verifyerrors and compiler infrastructure hazzle
operandStack.box();
operandStack.doGroovyCast(lhsType);
}
// normal type transformation
if (!ClassHelper.isPrimitiveType(lhsType) && isNull(rightExpression)) {
operandStack.replace(lhsType);
} else {
operandStack.doGroovyCast(lhsType);
}
rhsType = lhsType;
rhsValueId = compileStack.defineVariable(var, lhsType, true).getIndex();
} else {
rhsValueId = compileStack.defineTemporaryVariable("$rhs", rhsType, true);
}
// TODO: if rhs is VariableSlotLoader already, then skip crating a new one
BytecodeExpression rhsValueLoader = new VariableSlotLoader(rhsType, rhsValueId, operandStack);
// assignment for subscript
if (leftExpression instanceof BinaryExpression) {
BinaryExpression leftBinExpr = (BinaryExpression) leftExpression;
if (leftBinExpr.getOperation().getType() == Types.LEFT_SQUARE_BRACKET) {
assignToArray(
expression,
leftBinExpr.getLeftExpression(),
leftBinExpr.getRightExpression(),
rhsValueLoader);
}
compileStack.removeVar(rhsValueId);
return;
}
compileStack.pushLHS(true);
// multiple declaration
if (leftExpression instanceof TupleExpression) {
TupleExpression tuple = (TupleExpression) leftExpression;
int i = 0;
for (Expression e : tuple.getExpressions()) {
VariableExpression var = (VariableExpression) e;
MethodCallExpression call =
new MethodCallExpression(
rhsValueLoader, "getAt", new ArgumentListExpression(new ConstantExpression(i)));
call.visit(acg);
i++;
if (defineVariable) {
operandStack.doGroovyCast(var);
compileStack.defineVariable(var, true);
operandStack.remove(1);
} else {
acg.visitVariableExpression(var);
}
}
}
// single declaration
else if (defineVariable) {
rhsValueLoader.visit(acg);
operandStack.remove(1);
compileStack.popLHS();
return;
}
// normal assignment
else {
int mark = operandStack.getStackLength();
// to leave a copy of the rightExpression value on the stack after the assignment.
rhsValueLoader.visit(acg);
TypeChooser typeChooser = controller.getTypeChooser();
ClassNode targetType = typeChooser.resolveType(leftExpression, controller.getClassNode());
operandStack.doGroovyCast(targetType);
leftExpression.visit(acg);
operandStack.remove(operandStack.getStackLength() - mark);
}
compileStack.popLHS();
// return value of assignment
rhsValueLoader.visit(acg);
compileStack.removeVar(rhsValueId);
}