Critical Issue
The C2H Compiler always evaluates both operands of logical
(&&
, ||
) and conditional (?:
)
operators. This is different from expected American National Standards
Institute (ANSI) C behavior, where operands are evaluated left-to-right,
and unnecessary operands are skipped.
For example, in the expression (i-- && j--)
,
if the value of i
is zero, ANSI C does not evaluate
the right-hand-side (RHS) expression, and j
is not
decremented. By contrast, the C2H Compiler evaluates both sides,
decrementing j
.
The following expressions are other examples that might be affected by this issue:
if (i-- || j )
...;
a = ((cond == 1)? i : j );
Use logical and conditional operations whose operators have
no side effects. Operations with side effects include pre- and post-
increment and decrement operations (
, --
),
memory operations (*
, []
, ., ->
),
and function calls.