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constNode Class Reference

Constant expression. More...

#include <ast.h>

Inheritance diagram for constNode::

List of all members.

Public Methods
	constNode (constant value, const char *text="", const Coord coord=Coord::Unknown)
	Create a new constant value. More...
virtual	~constNode ()
	Destroy a constNode. More...
typeNode *	usual_unary_conversion_type ()
	Usual unary conversions. 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...
Accessors
Methods to get and set fields in the class.
string &	text ()
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
string	_text
	textual representation of the constant. More...

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Detailed Description

Constant expression.

This node holds a single constant value. The actual value is held in the exprNode::_value field. For constants derived from parsing, we also save the original textual representation of the constant.

The NodeType is Const.

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Constructor & Destructor Documentation

constNode::constNode (  constant    val, const char *    text = "", const Coord    coord = Coord::Unknown )

Create a new constant value. The new constant should have a value, but need not have a textual representation. The input string is copied, and not deleted. Parameters: value  the value of the constant text  a textual representation of the constant (optional) coord  the location of the construct in the source file.

constNode::~constNode (    )  [virtual]

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

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Member Function Documentation

Node * constNode::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* constNode::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 constNode::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 constNode::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.

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

Output a expression. Reimplemented from exprNode.

string& constNode::text (    )  [inline]

typeNode* constNode::usual_unary_conversion_type (    )  [inline]

Usual unary conversions. Warning: This method is probably obsolete

void constNode::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 constNode::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

string constNode::_text [private]

textual representation of the constant. We store the original textual representation or constants that come directly from the input source code. This allows us to regenerate the input code more accurately. It is not required, and can be automatically generated by the semantic type checker. See also: semcheck_walker

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

• ast.h
• constnode.cc

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