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Improved warning messages on UB shifts.

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acqn 2020-08-03 01:15:57 +08:00 committed by Oliver Schmidt
parent 2ab7272673
commit ef5a4db12e
1 changed files with 7 additions and 2 deletions
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9
src/cc65/shiftexpr.c
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@ -139,9 +139,14 @@ void ShiftExpr (struct ExprDesc* Expr)
** the operand, the behaviour is undefined according to the ** the operand, the behaviour is undefined according to the
** standard. ** standard.
*/ */
if (Expr2.IVal < 0 || Expr2.IVal >= (long) ExprBits) { if (Expr2.IVal < 0) {
Warning ("Shift count too large for operand type"); Warning ("Shift count '%ld' is negative", Expr2.IVal);
Expr2.IVal &= ExprBits - 1;
} else if (Expr2.IVal >= (long) ExprBits) {
Warning ("Shift count '%ld' >= width of type", Expr2.IVal);
Expr2.IVal &= ExprBits - 1; Expr2.IVal &= ExprBits - 1;
} }