Field Detail

• protected Set<MethodNode> alreadyVisitedMethods

  Methods already visited during the current checking pass.

• protected final Map<VariableExpression, List<ClassNode>> closureSharedVariablesAssignmentTypes

  A map used to store every type used in closure shared variable assignments. In a second pass, we will compute the LUB of each type and check that method calls on those variables are valid.

• protected CompilationUnit compilationUnit

  Compilation unit associated with the current type-checking run.

• protected Map<Parameter, ClassNode> controlStructureVariables

  Types tracked for variables introduced by control structures.

• protected DelegationMetadata delegationMetadata

  Whenever a method using a closure as argument (typically, "with") is detected, this list is updated with the receiver type of the with method.

• protected final LinkedList<BinaryExpression> enclosingBinaryExpressions

  Stack of enclosing binary expressions.

• protected final LinkedList<ClassNode> enclosingClassNodes

  Stack of enclosing class nodes.

• protected final LinkedList<EnclosingClosure> enclosingClosures

  Stack of enclosing closures.

• protected final LinkedList<Expression> enclosingMethodCalls

  Stack of enclosing method-call expressions.

• protected final LinkedList<MethodNode> enclosingMethods

  Stack of enclosing methods.

• protected final LinkedList<ErrorCollector> errorCollectors

  Error collectors stacked for nested type-checking operations.

• protected Map<VariableExpression, List<ClassNode>> ifElseForWhileAssignmentTracker

  This field is used to track assignments in if/else branches, for loops and while loops. For example, in the following code: if (cond) { x = 1 } else { x = '123' } the inferred type of x after the if/else statement should be the LUB of int and String.

• protected boolean isInStaticContext

  Indicates whether the current visit happens in a static context.

• protected ClassNode lastImplicitItType

  The type of the last encountered "it" implicit parameter.

• protected Set<MethodNode> methodsToBeVisited

  Optional filter restricting which methods should be visited.

• protected final Set<Long> reportedErrors

  Source positions that already produced a type-checking error.

• protected final LinkedHashSet<SecondPassExpression> secondPassExpressions

  Some expressions need to be visited twice, because type information may be insufficient at some point. For example, for closure shared variables, we need a first pass to collect every type which is assigned to a closure shared variable, then a second pass to ensure that every method call on such a variable is made on a LUB.

• protected SourceUnit source

  Source unit currently being type checked.

• protected final LinkedList<SwitchStatement> switchStatements

  Stack of enclosing switch statements.

• protected Stack<Map<Object, List<ClassNode>>> temporaryIfBranchTypeInformation

  Stores information which is valid in the "then" branch of an if-then-else statement. This is used when the if condition expression makes use of an instanceof check.

• protected final StaticTypeCheckingVisitor visitor

  Visitor that owns this context.

Constructor Detail

• public TypeCheckingContext(StaticTypeCheckingVisitor visitor)

  Creates a context for the supplied type-checking visitor.

Method Detail

• public CompilationUnit getCompilationUnit()

  Returns the compilation unit associated with this context.

• public BinaryExpression getEnclosingBinaryExpression()

  Returns the binary expression which is on the top of the stack, or null if there's no such element.

• public List<BinaryExpression> getEnclosingBinaryExpressionStack()

  Returns the current stack of enclosing binary expressions. The first element is the top of the stack.

• public ClassNode getEnclosingClassNode()

  Returns the class node which is on the top of the stack, or null if there's no such element.

• public List<ClassNode> getEnclosingClassNodes()

  Returns the current stack of enclosing classes. The first element is the top of the stack, that is to say the currently visited class.

• public TypeCheckingContext.EnclosingClosure getEnclosingClosure()

  Returns the closure expression which is on the top of the stack, or null if there's no such element.

• public List<EnclosingClosure> getEnclosingClosureStack()

  Returns the current stack of enclosing closure expressions. The first element is the top of the stack.

• public MethodNode getEnclosingMethod()

  Returns the method node which is on the top of the stack, or null if there's no such element.

• public Expression getEnclosingMethodCall()

  Returns the method call which is on the top of the stack, or null if there's no such element.

• public List<Expression> getEnclosingMethodCalls()

  Returns the current stack of enclosing method calls. The first element is the top of the stack, that is to say the currently visited method call.

• public List<MethodNode> getEnclosingMethods()

  Returns the current stack of enclosing methods. The first element is the top of the stack, that is to say the last visited method.

• public SwitchStatement getEnclosingSwitchStatement()

  Returns the switch statement which is on the top of the stack, or null if there's no such element.

• public List<SwitchStatement> getEnclosingSwitchStatements()

  Returns the current stack of enclosing switch statements. The first element is the top of the stack, that is to say the last visited switch statement.

• public ErrorCollector getErrorCollector()

  Returns the current error collector, or null if none is active.

• public List<ErrorCollector> getErrorCollectors()

  Returns the active error collector stack.

• public SourceUnit getSource()

  Returns the source unit currently being type checked.

• public boolean isTargetOfEnclosingAssignment(Expression expression)

  Indicates whether the expression is the left-hand side of the current assignment.

• public BinaryExpression popEnclosingBinaryExpression()

  Pops a binary expression from the binary expression stack.

• public ClassNode popEnclosingClassNode()

  Pops a class from the enclosing classes stack.

• public TypeCheckingContext.EnclosingClosure popEnclosingClosure()

  Pops a closure expression from the closure expression stack.

• public MethodNode popEnclosingMethod()

  Pops a method from the enclosing methods stack.

• public Expression popEnclosingMethodCall()

  Pops a method call from the enclosing method call stack.

• public SwitchStatement popEnclosingSwitchStatement()

  Pops a switch statement from the enclosing switch statements stack.

• public ErrorCollector popErrorCollector()

  Pops the current error collector.

• public void popTemporaryTypeInfo()

  Pops the current temporary type-information frame.

• public void pushEnclosingBinaryExpression(BinaryExpression binaryExpression)

  Pushes a binary expression into the binary expression stack.

• public void pushEnclosingClassNode(ClassNode classNode)

  Pushes a class into the classes stack.

• public void pushEnclosingClosureExpression(ClosureExpression closureExpression)

  Pushes a closure expression into the closure expression stack.

• public void pushEnclosingMethod(MethodNode methodNode)

  Pushes a method into the method stack.

• public void pushEnclosingMethodCall(Expression call)

  Pushes a method call into the method call stack.

  Parameters:

  call - the call expression to be pushed, either a MethodCallExpression or a StaticMethodCallExpression

• public void pushEnclosingSwitchStatement(SwitchStatement switchStatement)

  Pushes a switch statement into the switch statement stack.

• public ErrorCollector pushErrorCollector()

  Pushes a fresh error collector derived from the current compiler configuration.

• public void pushErrorCollector(ErrorCollector collector)

  Pushes the supplied error collector.

• public void pushTemporaryTypeInfo()

  Pushes a temporary type-information frame.

• public void setCompilationUnit(CompilationUnit compilationUnit)

  Sets the compilation unit associated with this context.