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Expr method to invert the sense of a relational

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This commit is contained in:
Vern Paxson 2021-05-30 17:31:22 -07:00
parent b1e95d68e0
commit 4ee8bd0082
2 changed files with 31 additions and 0 deletions
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24
src/Expr.cc
View file

@ -211,6 +211,11 @@ ExprPtr Expr::MakeLvalue()
return {NewRef{}, this};
}
bool Expr::InvertSense()
{
return false;
}
void Expr::EvalIntoAggregate(const zeek::Type* /* t */, Val* /* aggr */,
Frame* /* f */) const
{
@ -2043,6 +2048,12 @@ ValPtr EqExpr::Fold(Val* v1, Val* v2) const
return BinaryExpr::Fold(v1, v2);
}
bool EqExpr::InvertSense()
{
tag = (tag == EXPR_EQ ? EXPR_NE : EXPR_EQ);
return true;
}
RelExpr::RelExpr(BroExprTag arg_tag, ExprPtr arg_op1, ExprPtr arg_op2)
: BinaryExpr(arg_tag, std::move(arg_op1), std::move(arg_op2))
{
@ -2100,6 +2111,19 @@ void RelExpr::Canonicize()
}
}
bool RelExpr::InvertSense()
{
switch ( tag ) {
case EXPR_LT: tag = EXPR_GE; return true;
case EXPR_LE: tag = EXPR_GT; return true;
case EXPR_GE: tag = EXPR_LT; return true;
case EXPR_GT: tag = EXPR_LE; return true;
default:
return false;
}
}
CondExpr::CondExpr(ExprPtr arg_op1, ExprPtr arg_op2, ExprPtr arg_op3)
: Expr(EXPR_COND),
op1(std::move(arg_op1)), op2(std::move(arg_op2)), op3(std::move(arg_op3))

7
src/Expr.h
View file

@ -197,6 +197,11 @@ public:
// the current value of expr (this is the default method).
virtual ExprPtr MakeLvalue();
// Invert the sense of the operation. Returns true if the expression
// was invertible (currently only true for relational/equality
// expressions), false otherwise.
virtual bool InvertSense();
// Marks the expression as one requiring (or at least appearing
// with) parentheses. Used for pretty-printing.
void MarkParen() { paren = true; }
@ -791,6 +796,7 @@ public:
ExprPtr Duplicate() override;
bool WillTransform(Reducer* c) const override;
ExprPtr Reduce(Reducer* c, StmtPtr& red_stmt) override;
bool InvertSense() override;
protected:
ValPtr Fold(Val* v1, Val* v2) const override;
@ -805,6 +811,7 @@ public:
ExprPtr Duplicate() override;
bool WillTransform(Reducer* c) const override;
ExprPtr Reduce(Reducer* c, StmtPtr& red_stmt) override;
bool InvertSense() override;
};
class CondExpr final : public Expr {