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Fixed a bug: It was possible to increment or decrement const qualified

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objects.


git-svn-id: svn://svn.cc65.org/cc65/trunk@3882 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2008-08-07 22:18:12 +00:00
parent 92a4690ac3
commit 66b3f9d974
1 changed files with 73 additions and 9 deletions
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80
src/cc65/expr.c
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@ -1233,6 +1233,11 @@ static void PreInc (ExprDesc* Expr)
return;
}
/* We cannot modify const values */
if (IsQualConst (Expr->Type)) {
Error ("Increment of read-only variable");
}
/* Get the data type */
Flags = TypeOf (Expr->Type) | CF_FORCECHAR | CF_CONST;
@ -1304,6 +1309,11 @@ static void PreDec (ExprDesc* Expr)
return;
}
/* We cannot modify const values */
if (IsQualConst (Expr->Type)) {
Error ("Decrement of read-only variable");
}
/* Get the data type */
Flags = TypeOf (Expr->Type) | CF_FORCECHAR | CF_CONST;
@ -1359,8 +1369,8 @@ static void PreDec (ExprDesc* Expr)
static void PostIncDec (ExprDesc* Expr, void (*inc) (unsigned, unsigned long))
/* Handle i-- and i++ */
static void PostInc (ExprDesc* Expr)
/* Handle the postincrement operator */
{
unsigned Flags;
@ -1372,6 +1382,11 @@ static void PostIncDec (ExprDesc* Expr, void (*inc) (unsigned, unsigned long))
return;
}
/* We cannot modify const values */
if (IsQualConst (Expr->Type)) {
Error ("Increment of read-only variable");
}
/* Get the data type */
Flags = TypeOf (Expr->Type);
@ -1384,9 +1399,56 @@ static void PostIncDec (ExprDesc* Expr, void (*inc) (unsigned, unsigned long))
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
inc (Flags | CF_CONST | CF_FORCECHAR, 1);
g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
/* The result is always an expression, no reference */
ED_MakeRValExpr (Expr);
}
static void PostDec (ExprDesc* Expr)
/* Handle the postdecrement operator */
{
unsigned Flags;
NextToken ();
/* The expression to increment must be an lvalue */
if (!ED_IsLVal (Expr)) {
Error ("Invalid lvalue");
return;
}
/* We cannot modify const values */
if (IsQualConst (Expr->Type)) {
Error ("Decrement of read-only variable");
}
/* Get the data type */
Flags = TypeOf (Expr->Type);
/* Push the address if needed */
PushAddr (Expr);
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
@ -1505,6 +1567,7 @@ void hie10 (ExprDesc* Expr)
} else {
Error ("Illegal indirection");
}
/* The * operator yields an lvalue */
ED_MakeLVal (Expr);
}
break;
@ -1519,6 +1582,7 @@ void hie10 (ExprDesc* Expr)
Error ("Illegal address");
} else {
Expr->Type = PointerTo (Expr->Type);
/* The & operator yields an rvalue */
ED_MakeRVal (Expr);
}
break;
@ -1555,10 +1619,10 @@ void hie10 (ExprDesc* Expr)
hie11 (Expr);
/* Handle post increment */
if (CurTok.Tok == TOK_INC) {
PostIncDec (Expr, g_inc);
} else if (CurTok.Tok == TOK_DEC) {
PostIncDec (Expr, g_dec);
switch (CurTok.Tok) {
case TOK_INC: PostInc (Expr); break;
case TOK_DEC: PostDec (Expr); break;
default: break;
}
}