MathExpr Class Reference

#include <mathexpr.hh>

Classes
class	Node
struct	OpSearch

Public Types
typedef std::function< double(std::string)>	EvalCallback

Public Member Functions
	MathExpr (std::string expr)
std::string	toStr () const
	Prints an ASCII representation of the expression tree. More...
double	eval (EvalCallback fn) const
	Evaluates the expression. More...

Private Types
enum	Operator {   bAdd, bSub, bMul, bDiv,   bPow, uNeg, sValue, sVariable,   nInvalid }
typedef double(*	binOp )(double, double)

Private Member Functions
Node *	parse (std::string expr)
	Parse and create nodes from string. More...
std::string	toStr (Node *n, std::string prefix) const
	Print tree as string. More...
double	eval (const Node *n, EvalCallback fn) const
	Eval a node. More...

Private Attributes
const int	MAX_PRIO = 4
std::array< OpSearch, uNeg+1 >	ops
	Operator list. More...
Node *	root
	Root node. More...

Detailed Description

Definition at line 48 of file mathexpr.hh.

Member Typedef Documentation

typedef double(* MathExpr::binOp)(double, double)

private

Definition at line 78 of file mathexpr.hh.

typedef std::function<double(std::string)> MathExpr::EvalCallback

Definition at line 53 of file mathexpr.hh.

Member Enumeration Documentation

enum MathExpr::Operator

private

Enumerator
bAdd
bSub
bMul
bDiv
bPow
uNeg
sValue
sVariable
nInvalid

Definition at line 72 of file mathexpr.hh.

Constructor & Destructor Documentation

MathExpr::MathExpr

(

std::string

expr

)

Definition at line 49 of file mathexpr.cc.

References ArmISA::a, ArmISA::b, bAdd, bDiv, bMul, bPow, bSub, and uNeg.

Member Function Documentation

double MathExpr::eval ( EvalCallback  fn ) const

inline

Evaluates the expression.

Parameters

fn	A callback funcion to evaluate variables

Returns

The value for this expression

Definition at line 69 of file mathexpr.hh.

References eval(), and root.

Referenced by eval(), and MathExprPowerModel::tryEval().

double MathExpr::eval ( const Node *  n, EvalCallback  fn  ) const

private

Eval a node.

Definition at line 152 of file mathexpr.cc.

References eval(), ArmISA::fn, MathExpr::Node::l, MathExpr::Node::op, ops, panic, MathExpr::Node::r, sValue, sVariable, MathExpr::Node::value, and MathExpr::Node::variable.

MathExpr::Node * MathExpr::parse ( std::string  expr )

private

Parse and create nodes from string.

This function parses a string expression into an expression tree.

It will look for operators in priority order to recursively build the tree, respecting parenthesization. Constants can be expressed in any format accepted by std::stod, whereas variables are essentially [A-Za-z0-9.$\]+

Definition at line 77 of file mathexpr.cc.

References ArmISA::c, ArmISA::i, MathExpr::Node::l, MipsISA::l, MAX_PRIO, ArmISA::n, MathExpr::Node::op, ops, MipsISA::p, MipsISA::r, MathExpr::Node::r, sValue, sVariable, ArmISA::v, MathExpr::Node::value, and MathExpr::Node::variable.

std::string MathExpr::toStr ( ) const

inline

Prints an ASCII representation of the expression tree.

Returns

A string containing the ASCII representation of the expression

Definition at line 60 of file mathexpr.hh.

References root, and toStr().

Referenced by MathExprPowerModel::eval(), and toStr().

std::string MathExpr::toStr ( Node *  n, std::string  prefix  ) const

private

Print tree as string.

Definition at line 169 of file mathexpr.cc.

References MathExpr::Node::l, MathExpr::Node::r, toStr(), and MathExpr::Node::toStr().

Member Data Documentation

const int MathExpr::MAX_PRIO = 4

private

Definition at line 77 of file mathexpr.hh.

Referenced by parse().

std::array<OpSearch, uNeg + 1> MathExpr::ops

private

Operator list.

Definition at line 88 of file mathexpr.hh.

Referenced by eval(), and parse().

Node* MathExpr::root

private

Root node.

Definition at line 114 of file mathexpr.hh.

Referenced by eval(), and toStr().

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

• sim/mathexpr.hh
• sim/mathexpr.cc