gem5::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.
double	eval (EvalCallback fn) const
	Evaluates the expression.
std::vector< std::string >	getVariables () const
	Return all variables in the this expression.

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.
std::string	toStr (Node *n, std::string prefix) const
	Print tree as string.
double	eval (const Node *n, EvalCallback fn) const
	Eval a node.
void	getVariables (const Node *n, std::vector< std::string > &vars) const
	Return all variable reachable from a node to a vector of strings.

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

Detailed Description

Definition at line 50 of file mathexpr.hh.

Member Typedef Documentation

binOp

typedef double(* gem5::MathExpr::binOp) (double, double)

private

Definition at line 98 of file mathexpr.hh.

EvalCallback

typedef std::function<double(std::string)> gem5::MathExpr::EvalCallback

Definition at line 56 of file mathexpr.hh.

Member Enumeration Documentation

Operator

enum gem5::MathExpr::Operator

private

Enumerator
bAdd
bSub
bMul
bDiv
bPow
uNeg
sValue
sVariable
nInvalid

Definition at line 91 of file mathexpr.hh.

Constructor & Destructor Documentation

MathExpr()

gem5::MathExpr::MathExpr

(

std::string

expr

)

Definition at line 50 of file mathexpr.cc.

References gem5::ArmISA::a, gem5::ArmISA::b, bAdd, bDiv, bMul, bPow, bSub, and uNeg.

Member Function Documentation

eval() [1/2]

double gem5::MathExpr::eval ( const Node * n, EvalCallback fn ) const

private

Eval a node.

Definition at line 153 of file mathexpr.cc.

References eval(), gem5::ArmISA::fn, gem5::ArmISA::n, ops, panic, sValue, and sVariable.

eval() [2/2]

double gem5::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 72 of file mathexpr.hh.

References eval(), gem5::ArmISA::fn, and root.

Referenced by eval(), eval(), and gem5::MathExprPowerModel::eval().

getVariables() [1/2]

std::vector< std::string > gem5::MathExpr::getVariables ( ) const

inline

Return all variables in the this expression.

This function starts from the root node and traverses all nodes while adding the variables it finds to a vector. Returns the found variables in a vector of strings

Returns

A Vector with the names of all variables

Definition at line 83 of file mathexpr.hh.

References getVariables(), and root.

Referenced by getVariables(), and getVariables().

getVariables() [2/2]

void gem5::MathExpr::getVariables ( const Node * n, std::vector< std::string > & vars ) const

private

Return all variable reachable from a node to a vector of strings.

Definition at line 181 of file mathexpr.cc.

References getVariables(), gem5::ArmISA::n, nInvalid, sValue, and sVariable.

parse()

MathExpr::Node * gem5::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 78 of file mathexpr.cc.

References gem5::ArmISA::c, gem5::ArmISA::i, gem5::MipsISA::l, MAX_PRIO, gem5::ArmISA::n, ops, gem5::MipsISA::p, parse(), gem5::ArmISA::priority, gem5::MipsISA::r, sValue, sVariable, and gem5::ArmISA::v.

Referenced by parse().

toStr() [1/2]

std::string gem5::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 63 of file mathexpr.hh.

References root, and toStr().

Referenced by toStr(), and toStr().

toStr() [2/2]

std::string gem5::MathExpr::toStr ( Node * n, std::string prefix ) const

private

Print tree as string.

Definition at line 170 of file mathexpr.cc.

References gem5::ArmISA::n, and toStr().

Member Data Documentation

MAX_PRIO

const int gem5::MathExpr::MAX_PRIO = 4

private

Definition at line 97 of file mathexpr.hh.

Referenced by parse().

ops

std::array<OpSearch, uNeg + 1> gem5::MathExpr::ops

private

Operator list.

Definition at line 109 of file mathexpr.hh.

Referenced by eval(), and parse().

root

Node* gem5::MathExpr::root

private

Root node.

Definition at line 136 of file mathexpr.hh.

Referenced by eval(), getVariables(), and toStr().

---

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

• sim/mathexpr.hh
• sim/mathexpr.cc