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commaNode Class Reference

Comma-separated expressions. More...

#include <ast.h>

Inheritance diagram for commaNode::

List of all members.

Public Methods
	commaNode (expr_list *exprs, const Coord coord=Coord::Unknown)
	Create a new comma expression. More...
	commaNode (const Coord coord=Coord::Unknown)
	Create an empty comma expression. More...
virtual	~commaNode ()
	Destroy a commaNode. More...
typeNode *	base_type (bool TdefIndir) const
	Return the base data type of a node. More...
virtual void	eval ()
	Constant expression evaluator. More...
virtual void	dataflow (FlowVal *v, FlowProblem &fp)
	Run the dataflow analyzer. More...
virtual Node *	clone () const
	Clone the input node. More...
virtual void	output_expr (output_context &ct, Node *par, int prec, Assoc assoc)
	Output a expression. More...
virtual int	precedence (Assoc &assoc)
	Associativity and precedence. More...
Accessors
Methods to get and set fields in the class.
expr_list &	exprs ()
const expr_list &	exprs () const
AST Traversal
Methods to uniformly traverse the AST. See the documentation in the Node class.
virtual void	visit (Visitor *the_visitor)
	Dispatch a Visitor. More...
virtual void	walk (Walker &the_walker)
	Dispatch a Walker. More...
virtual Node *	change (Changer &the_changer, bool redispatch=false)
	Dispatch a Changer. More...
Private Attributes
TREE expr_list	_exprs
	The comma-separated expressions. More...

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Detailed Description

Comma-separated expressions.

This class represents a comma-separated list of expressions. Rather than represent the comma operator as a binary expression, we gather together a series of commas and put them in a single node.

The NodeType is Comma.

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Constructor & Destructor Documentation

commaNode::commaNode (  expr_list *    exprs, const Coord    coord = Coord::Unknown )

Create a new comma expression. The new comma node has the given list of expressions. The elements are removed from the list and the list is destroyed. Parameters: exprs  the list of expressions coord  the location of the construct in the source file.

commaNode::commaNode (  const Coord    coord = Coord::Unknown )

Create an empty comma expression. The new comma node has no expressions initially. They can be added by modifying the _exprs list. Parameters: coord  the location of the construct in the source file.

commaNode::~commaNode (    )  [virtual]

Destroy a commaNode. Warning: Do not use the destructors to delete AST nodes. Instead, rely on the node garbage collector.

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Member Function Documentation

typeNode * commaNode::base_type (  bool    TdefIndir )  const [virtual]

Return the base data type of a node. This method differs from the Node::type() method in two respects. First, it follows some of the simple type inferences. For example, calling it on an idNode will return the type of its declaration. Second, the boolean argument indicates whether or not to follow typedef links. Parameters: TdefIndir  pass true to follow typedefs to their definitions. Reimplemented from exprNode.

Node * commaNode::change (  Changer &    the_changer, bool    redispatch = false )  [virtual]

Dispatch a Changer. This abstract method works much the walker, but allows the tree to be changed. Parameters: the_changer  the specific Changer object to use. redispatch  pass true to revisit parts of the tree that have changed. Reimplemented from Node.

virtual Node* commaNode::clone (    )  const [inline, virtual]

Clone the input node. This is not a "deep" clone, so be careful. For a deep clone, use the clone_changer class. Returns: a shallow copy of the node (no subtrees are copied). Reimplemented from Node.

void commaNode::dataflow (  FlowVal *    v, FlowProblem &    fp )  [virtual]

Run the dataflow analyzer. Each subclass overrides this method to define it's semantics for dataflow analysis. It alters the input flow value to reflect the effect of the node within the given flow problem, calling dataflow() on it's subtrees as necessary. See the dataflow analysis documentation for more information. Parameters: v  the flow value to pass through the node. fp  the flow problem (specifying the transfer functions). Reimplemented from Node.

void commaNode::eval (    )  [virtual]

Constant expression evaluator. This method attempts to evaluate an expression at compile-time. This only yields a meaningful value when the leaves of the given expression are constants, enums, or other compile-time values (e.g., sizeof). The resulting value is stored on each exprNode, in the _value field. Each exprNode sublcass implements this method, calling it recursively when necessary. Reimplemented from exprNode.

const expr_list& commaNode::exprs (    )  const [inline]

expr_list& commaNode::exprs (    )  [inline]

void commaNode::output_expr (  output_context &    ct, Node *    parent, int    prec, Assoc    assoc )  [virtual]

Output a expression. Reimplemented from exprNode.

int commaNode::precedence (  Assoc &    assoc )  [virtual]

Associativity and precedence. Determine the associativity and precedence of the expression. Each exprNode subclass overrides this method to provide the specific results. The default is highest precedence and left-associative. See also: exprNode::output_expr() , exprNode::parens() Parameters: assoc  a reference parameter that is set to the associativity value Returns: the precedence value Reimplemented from exprNode.

void commaNode::visit (  Visitor *    the_visitor )  [virtual]

Dispatch a Visitor. This abstract method is the entry point for the visitor design pattern. Each node subclass defines a visit() method that calls the appropriate at_ method in the visitor. For more information see the Visitor documentation. Parameters: the_visitor  the specific Visitor object to use. Reimplemented from Node.

void commaNode::walk (  Walker &    the_walker )  [virtual]

Dispatch a Walker. This abstract method works much like the visitor, but instead walks the entire underlying subtree calling the appropriate at_ method at each node. For more information see the Walker documentation. Parameters: the_walker  the specific Walker object to use. Reimplemented from Node.

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Member Data Documentation

TREE expr_list commaNode::_exprs [private]

The comma-separated expressions. The expression in this list are in the order they appeared in the source.

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The documentation for this class was generated from the following files:

• ast.h
• commanode.cc

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