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Added a warning if the result of a compare operation is constant. This should

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protect against missing parenthesis like in (si & 0x7F == 0). Hopefully
without too many false positives.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4057 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-27 22:00:18 +00:00
parent 55e8f67640
commit d65928829f
1 changed files with 10 additions and 8 deletions
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18
src/cc65/expr.c
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@ -1864,17 +1864,17 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
/* Make sure, the types are compatible */
if (IsClassInt (Expr->Type)) {
if (!IsClassInt (Expr2.Type) && !(IsClassPtr(Expr2.Type) && ED_IsNullPtr(Expr))) {
Error ("Incompatible types");
Error ("Incompatible types");
}
} else if (IsClassPtr (Expr->Type)) {
if (IsClassPtr (Expr2.Type)) {
/* Both pointers are allowed in comparison if they point to
* the same type, or if one of them is a void pointer.
/* Both pointers are allowed in comparison if they point to
* the same type, or if one of them is a void pointer.
*/
Type* left = Indirect (Expr->Type);
Type* right = Indirect (Expr2.Type);
if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
/* Incomatible pointers */
Type* right = Indirect (Expr2.Type);
if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
/* Incomatible pointers */
Error ("Incompatible types");
}
} else if (!ED_IsNullPtr (&Expr2)) {
@ -1885,6 +1885,8 @@ static void hie_compare (const GenDesc* Ops, /* List of generators */
/* Check for const operands */
if (ED_IsConstAbs (Expr) && rconst) {
Warning ("Result of comparison is constant");
/* Both operands are constant, remove the generated code */
RemoveCode (&Mark1);
@ -2940,7 +2942,7 @@ static void addsubeq (const GenDesc* Gen, ExprDesc *Expr)
g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Indirect (Expr->Type)));
}
}
/* Setup the code generator flags */
lflags |= TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR;
rflags |= TypeOf (Expr2.Type) | CF_FORCECHAR;
@ -2950,7 +2952,7 @@ static void addsubeq (const GenDesc* Gen, ExprDesc *Expr)
/* Output apropriate code depending on the location */
switch (ED_GetLoc (Expr)) {
case E_LOC_ABS:
/* Absolute: numeric address or const */
if (Gen->Tok == TOK_PLUS_ASSIGN) {