P4::P4Tools::Taint Class Reference

Static Public Member Functions
static const IR::Literal *	buildTaintMask (const Model *evaluatedModel, const IR::Expression *programPacket)
static bool	hasTaint (const IR::Expression *expr)
static const IR::Expression *	propagateTaint (const IR::Expression *expr)

Static Public Attributes
static const IR::StringLiteral	TAINTED_STRING_LITERAL = IR::StringLiteral("Taint"_cs)

Member Function Documentation

buildTaintMask()

const IR::Literal * P4::P4Tools::Taint::buildTaintMask ( const Model * evaluatedModel, const IR::Expression * programPacket )

static

Returns

the mask for the corresponding program packet, indicating bits of the expression which are not tainted.

hasTaint()

bool P4::P4Tools::Taint::hasTaint ( const IR::Expression * expr )

static

Returns

whether the given expression is tainted. An expression is tainted if one or more bits of the expression are expected to evaluate to (possibly part of) IR::TaintExpression.

propagateTaint()

const IR::Expression * P4::P4Tools::Taint::propagateTaint ( const IR::Expression * expr )

static

Returns

a expression in which taint has been propagated upwards. At the end, this will either return a literal, a Member/PathExpression, or a concatenation. Any non-tainted variable is replaced with a zero constant. This function is used for the generation of taint masks.