mirror of
https://github.com/cc65/cc65.git
synced 2024-12-24 11:31:31 +00:00
Reusing code from parseadd() for ArrayRef().
Now index[ptr] works in constant expressions. Fixed codegen for cast type in constant expressions. Calls on swapstk in 'i[ptr]' is avoided when possible.
This commit is contained in:
acqn
Oliver Schmidt
parent
f5972dfd08
commit
99c7fe0ada
423
src/cc65/expr.c
423
src/cc65/expr.c
@ -74,11 +74,20 @@ static GenDesc GenOASGN = { TOK_OR_ASSIGN, GEN_NOPUSH, g_or };
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/*****************************************************************************/
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/* Helper functions */
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/* Forward declarations */
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/*****************************************************************************/
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static void parseadd (ExprDesc* Expr, int DoArrayRef);
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/*****************************************************************************/
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/* Helper functions */
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/*****************************************************************************/
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static unsigned GlobalModeFlags (const ExprDesc* Expr)
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/* Return the addressing mode flags for the given expression */
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{
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@ -1333,294 +1342,6 @@ static void Primary (ExprDesc* E)
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static void ArrayRef (ExprDesc* Expr)
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/* Handle an array reference. This function needs a rewrite. */
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{
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int ConstBaseAddr;
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ExprDesc Subscript;
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CodeMark Mark1;
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CodeMark Mark2;
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TypeCode Qualifiers;
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Type* ElementType;
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Type* tptr1;
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ED_Init (&Subscript);
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Subscript.Flags |= Expr->Flags & E_MASK_KEEP_SUBEXPR;
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/* Skip the bracket */
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NextToken ();
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/* Get the type of left side */
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tptr1 = Expr->Type;
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/* We can apply a special treatment for arrays that have a const base
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** address. This is true for most arrays and will produce a lot better
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** code. Check if this is a "quasi-const base" address.
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*/
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ConstBaseAddr = ED_IsRVal (Expr) && ED_IsLocQuasiConst (Expr);
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/* If we have a quasi-const base address, we delay the address fetch */
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GetCodePos (&Mark1);
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if (!ConstBaseAddr) {
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/* Get a pointer to the array into the primary */
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LoadExpr (CF_NONE, Expr);
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/* Get the array pointer on stack. Do not push more than 16
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** bit, even if this value is greater, since we cannot handle
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** other than 16bit stuff when doing indexing.
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*/
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GetCodePos (&Mark2);
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g_push (CF_PTR, 0);
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}
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/* TOS now contains ptr to array elements. Get the subscript. */
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MarkedExprWithCheck (hie0, &Subscript);
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/* Check the types of array and subscript. We can either have a
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** pointer/array to the left, in which case the subscript must be of an
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** integer type, or we have an integer to the left, in which case the
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** subscript must be a pointer/array.
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** Since we do the necessary checking here, we can rely later on the
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** correct types.
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*/
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Qualifiers = T_QUAL_NONE;
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if (IsClassPtr (Expr->Type)) {
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if (!IsClassInt (Subscript.Type)) {
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Error ("Array subscript is not an integer");
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/* To avoid any compiler errors, make the expression a valid int */
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ED_MakeConstAbsInt (&Subscript, 0);
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}
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if (IsTypeArray (Expr->Type)) {
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Qualifiers = GetQualifier (Expr->Type);
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}
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ElementType = Indirect (Expr->Type);
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} else if (IsClassInt (Expr->Type)) {
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if (!IsClassPtr (Subscript.Type)) {
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Error ("Subscripted value is neither array nor pointer");
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/* To avoid compiler errors, make the subscript a char[] at
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** address 0.
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*/
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ED_MakeConstAbs (&Subscript, 0, GetCharArrayType (1));
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} else if (IsTypeArray (Subscript.Type)) {
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Qualifiers = GetQualifier (Subscript.Type);
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}
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ElementType = Indirect (Subscript.Type);
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} else {
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Error ("Cannot subscript");
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/* To avoid compiler errors, fake both the array and the subscript, so
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** we can just proceed.
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*/
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ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
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ED_MakeConstAbsInt (&Subscript, 0);
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ElementType = Indirect (Expr->Type);
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}
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/* The element type has the combined qualifiers from itself and the array,
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** it is a member of (if any).
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*/
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if (GetQualifier (ElementType) != (GetQualifier (ElementType) | Qualifiers)) {
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ElementType = TypeDup (ElementType);
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ElementType->C |= Qualifiers;
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}
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/* If the subscript is a bit-field, load it and make it an rvalue */
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if (ED_IsBitField (&Subscript)) {
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LoadExpr (CF_NONE, &Subscript);
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ED_FinalizeRValLoad (&Subscript);
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}
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/* Make the address of the array element from the base and subscript */
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if (ED_IsConstAbs (&Subscript) && ED_CodeRangeIsEmpty (&Subscript)) {
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/* The array subscript is a constant. Since we can have the element
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** address directly as base+offset, we can remove the array address
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** push onto the stack before if loading subscript doesn't tamper that
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** address in the primary.
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*/
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if (!ConstBaseAddr) {
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RemoveCode (&Mark2);
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} else {
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/* Get an array pointer into the primary */
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LoadExpr (CF_NONE, Expr);
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}
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if (IsClassPtr (Expr->Type)) {
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/* Lhs is pointer/array. Scale the subscript value according to
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** the element size.
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*/
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Subscript.IVal *= CheckedSizeOf (ElementType);
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/* Remove the address load code */
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RemoveCode (&Mark1);
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/* In case of an array, we can adjust the offset of the expression
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** already in Expr. If the base address was a constant, we can even
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** remove the code that loaded the address into the primary.
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*/
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if (!IsTypeArray (Expr->Type)) {
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/* It's a pointer, so we do have to load it into the primary
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** first (if it's not already there).
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*/
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if (!ConstBaseAddr && ED_IsLVal (Expr)) {
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LoadExpr (CF_NONE, Expr);
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ED_FinalizeRValLoad (Expr);
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}
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}
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/* Adjust the offset */
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Expr->IVal += Subscript.IVal;
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} else {
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/* Scale the lhs value according to the element type */
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g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
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/* Add the subscript. Since arrays are indexed by integers,
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** we will ignore the true type of the subscript here and
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** use always an int. #### Use offset but beware of LoadExpr!
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*/
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g_inc (CF_INT | CF_CONST, Subscript.IVal);
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}
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} else {
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/* Array subscript is not constant. Load it into the primary */
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GetCodePos (&Mark2);
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LoadExpr (CF_NONE, &Subscript);
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/* Do scaling */
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if (IsClassPtr (Expr->Type)) {
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/* Indexing is based on unsigneds, so we will just use the integer
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** portion of the index (which is in (e)ax, so there's no further
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** action required).
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*/
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g_scale (CF_INT, CheckedSizeOf (ElementType));
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} else {
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/* Get the int value on top. If we come here, we're sure, both
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** values are 16 bit (the first one was truncated if necessary
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** and the second one is a pointer). Note: If ConstBaseAddr is
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** true, we don't have a value on stack, so to "swap" both, just
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** push the subscript.
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*/
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if (ConstBaseAddr) {
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g_push (CF_INT, 0);
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LoadExpr (CF_NONE, Expr);
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ConstBaseAddr = 0;
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} else {
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g_swap (CF_INT);
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}
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/* Scale it */
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g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
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}
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/* The offset is now in the primary register. It we didn't have a
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** constant base address for the lhs, the lhs address is already
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** on stack, and we must add the offset. If the base address was
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** constant, we call special functions to add the address to the
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** offset value.
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*/
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if (!ConstBaseAddr) {
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/* The array base address is on stack and the subscript is in the
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** primary. Add both.
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*/
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g_add (CF_INT, 0);
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} else {
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/* The subscript is in the primary, and the array base address is
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** in Expr. If the subscript has itself a constant address, it is
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** often a better idea to reverse again the order of the
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** evaluation. This will generate better code if the subscript is
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** a byte sized variable. But beware: This is only possible if the
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** subscript was not scaled, that is, if this was a byte array
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** or pointer.
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*/
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if (ED_IsLocQuasiConst (&Subscript) &&
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CheckedSizeOf (ElementType) == SIZEOF_CHAR) {
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unsigned Flags;
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/* Reverse the order of evaluation */
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if (CheckedSizeOf (Subscript.Type) == SIZEOF_CHAR) {
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Flags = CF_CHAR;
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} else {
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Flags = CF_INT;
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}
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RemoveCode (&Mark2);
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/* Get a pointer to the array into the primary. */
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LoadExpr (CF_NONE, Expr);
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/* Add the variable */
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if (ED_IsLocStack (&Subscript)) {
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g_addlocal (Flags, Subscript.IVal);
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} else {
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Flags |= GlobalModeFlags (&Subscript);
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g_addstatic (Flags, Subscript.Name, Subscript.IVal);
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}
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} else {
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if (ED_IsLocNone (Expr) ||
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(ED_IsLocAbs (Expr) && ED_IsAddrExpr (Expr))) {
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/* Constant numeric address. Just add it */
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g_inc (CF_INT, Expr->IVal);
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} else if (ED_IsLocStack (Expr)) {
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/* Base address is a local variable address */
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if (ED_IsAddrExpr (Expr)) {
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g_addaddr_local (CF_INT, Expr->IVal);
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} else {
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g_addlocal (CF_PTR, Expr->IVal);
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}
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} else {
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/* Base address is a static variable address */
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unsigned Flags = CF_INT | GlobalModeFlags (Expr);
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if (ED_IsAddrExpr (Expr)) {
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/* Add the address of the location */
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g_addaddr_static (Flags, Expr->Name, Expr->IVal);
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} else {
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/* Add the contents of the location */
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g_addstatic (Flags, Expr->Name, Expr->IVal);
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}
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}
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}
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}
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/* The address of the element is an rvalue in the primary */
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ED_FinalizeRValLoad (Expr);
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}
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/* The final result is usually an lvalue expression of element type
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** referenced in the primary, unless it is once again an array. We can just
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** assume the usual case first, and change it later if necessary.
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*/
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ED_IndExpr (Expr);
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Expr->Type = ElementType;
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/* An array element is actually a variable. So the rules for variables with
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** respect to the reference type apply: If it's an array, it is virtually
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** an rvalue address, otherwise it's an lvalue reference. (A function would
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** also be an rvalue address, but an array cannot contain functions).
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*/
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if (IsTypeArray (Expr->Type)) {
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ED_AddrExpr (Expr);
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}
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/* Consume the closing bracket */
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ConsumeRBrack ();
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}
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static void StructRef (ExprDesc* Expr)
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/* Process struct/union field after . or ->. */
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{
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@ -1793,7 +1514,7 @@ static void hie11 (ExprDesc *Expr)
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case TOK_LBRACK:
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/* Array reference */
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ArrayRef (Expr);
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parseadd (Expr, 1);
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break;
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case TOK_LPAREN:
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@ -3034,10 +2755,11 @@ static void hie9 (ExprDesc *Expr)
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static void parseadd (ExprDesc* Expr)
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/* Parse an expression with the binary plus operator. Expr contains the
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** unprocessed left hand side of the expression and will contain the
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** result of the expression on return.
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static void parseadd (ExprDesc* Expr, int DoArrayRef)
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/* Parse an expression with the binary plus or subscript operator. Expr contains
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** the unprocessed left hand side of the expression and will contain the result
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** of the expression on return. If DoArrayRef is zero, this evaluates the binary
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** plus operation. Otherwise, this evaluates the subscript operation.
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*/
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{
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ExprDesc Expr2;
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@ -3052,7 +2774,7 @@ static void parseadd (ExprDesc* Expr)
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ED_Init (&Expr2);
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Expr2.Flags |= Expr->Flags & E_MASK_KEEP_SUBEXPR;
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/* Skip the PLUS token */
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/* Skip the PLUS or opening bracket token */
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NextToken ();
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/* Get the left hand side type, initialize operation flags */
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@ -3077,7 +2799,7 @@ static void parseadd (ExprDesc* Expr)
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if (ED_IsQuasiConst (Expr)) {
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/* The left hand side is a constant of some sort. Good. Get rhs */
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ExprWithCheck (hie9, &Expr2);
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ExprWithCheck (DoArrayRef ? hie0 : hie9, &Expr2);
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/* Right hand side is constant. Get the rhs type */
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rhst = Expr2.Type;
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@ -3094,7 +2816,7 @@ static void parseadd (ExprDesc* Expr)
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lscale = CheckedPSizeOf (rhst);
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/* Operate on pointers, result type is a pointer */
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flags = CF_PTR;
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} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
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} else if (!DoArrayRef && IsClassInt (lhst) && IsClassInt (rhst)) {
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/* Integer addition */
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flags = CF_INT;
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} else {
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@ -3123,20 +2845,22 @@ static void parseadd (ExprDesc* Expr)
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}
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if (AddDone) {
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/* Adjust the result */
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if (IsClassPtr (lhst)) {
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/* Result type is a pointer */
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Expr->Type = PtrConversion (lhst);
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} else if (IsClassPtr (rhst)) {
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/* Result type is a pointer */
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Expr->Type = PtrConversion (rhst);
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} else {
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/* Limit the calculated value to the range of its type */
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LimitExprValue (Expr);
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}
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/* Adjust the result for addition */
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if (!DoArrayRef) {
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if (IsClassPtr (lhst)) {
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/* Result type is a pointer */
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Expr->Type = lhst;
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} else if (IsClassPtr (rhst)) {
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/* Result type is a pointer */
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Expr->Type = rhst;
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} else {
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/* Limit the calculated value to the range of its type */
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LimitExprValue (Expr);
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}
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/* The result is always an rvalue */
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ED_MarkExprAsRVal (Expr);
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/* The result is always an rvalue */
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ED_MarkExprAsRVal (Expr);
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}
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} else {
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/* Decide the order */
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if (!ED_IsAbs (&Expr2) && rscale > 1) {
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@ -3214,7 +2938,7 @@ static void parseadd (ExprDesc* Expr)
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/* Operate on pointers, result type is a pointer */
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flags |= CF_PTR;
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Expr->Type = Expr2.Type;
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} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
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} else if (!DoArrayRef && IsClassInt (lhst) && IsClassInt (rhst)) {
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/* Integer addition */
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flags |= typeadjust (Expr, &Expr2, 1);
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} else {
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@ -3270,8 +2994,6 @@ static void parseadd (ExprDesc* Expr)
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g_add (CF_PTR, 0);
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}
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}
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/* Array and function types must be converted to pointer types */
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Expr->Type = PtrConversion (Expr->Type);
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/* Result is an rvalue in primary register */
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ED_FinalizeRValLoad (Expr);
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@ -3286,7 +3008,7 @@ static void parseadd (ExprDesc* Expr)
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g_push (flags, 0); /* --> stack */
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/* Evaluate the rhs */
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MarkedExprWithCheck (hie9, &Expr2);
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MarkedExprWithCheck (DoArrayRef ? hie0 : hie9, &Expr2);
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/* Get the rhs type */
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rhst = Expr2.Type;
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@ -3309,7 +3031,7 @@ static void parseadd (ExprDesc* Expr)
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/* Operate on pointers, result type is a pointer */
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flags = CF_PTR;
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Expr->Type = Expr2.Type;
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} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
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} else if (!DoArrayRef && IsClassInt (lhst) && IsClassInt (rhst)) {
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/* Integer addition */
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flags = typeadjust (Expr, &Expr2, 1);
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} else {
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@ -3356,7 +3078,7 @@ static void parseadd (ExprDesc* Expr)
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/* Operate on pointers, result type is a pointer */
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flags = CF_PTR;
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Expr->Type = Expr2.Type;
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} else if (IsClassInt (lhst) && IsClassInt (rhst)) {
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} else if (!DoArrayRef && IsClassInt (lhst) && IsClassInt (rhst)) {
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/* Integer addition. Note: Result is never constant.
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** Problem here is that typeadjust does not know if the
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** variable is an rvalue or lvalue, so if both operands
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@ -3380,18 +3102,69 @@ static void parseadd (ExprDesc* Expr)
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}
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/* Array and function types must be converted to pointer types */
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Expr->Type = PtrConversion (Expr->Type);
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/* Result is an rvalue in primary register */
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ED_FinalizeRValLoad (Expr);
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}
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if (AddDone < 0) {
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Error ("Invalid operands for binary operator '+'");
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/* Deal with array ref */
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if (DoArrayRef) {
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TypeCode Qualifiers = T_QUAL_NONE;
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Type* ElementType;
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/* Check the types of array and subscript */
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if (IsClassPtr (lhst)) {
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if (!IsClassInt (rhst)) {
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Error ("Array subscript is not an integer");
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ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
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} else if (IsTypeArray (lhst)) {
|
||||
Qualifiers = GetQualifier (lhst);
|
||||
}
|
||||
} else if (IsClassInt (lhst)) {
|
||||
if (!IsClassPtr (rhst)) {
|
||||
Error ("Subscripted value is neither array nor pointer");
|
||||
ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
|
||||
} else if (IsTypeArray (rhst)) {
|
||||
Qualifiers = GetQualifier (rhst);
|
||||
}
|
||||
} else {
|
||||
Error ("Cannot subscript");
|
||||
ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
|
||||
}
|
||||
|
||||
/* The element type has the combined qualifiers from itself and the array,
|
||||
** it is a member of (if any).
|
||||
*/
|
||||
ElementType = Indirect (Expr->Type);
|
||||
if (GetQualifier (ElementType) != (GetQualifier (ElementType) | Qualifiers)) {
|
||||
ElementType = TypeDup (ElementType);
|
||||
ElementType->C |= Qualifiers;
|
||||
}
|
||||
|
||||
/* The final result is usually an lvalue expression of element type
|
||||
** referenced in the primary, unless it is once again an array. We can just
|
||||
** assume the usual case first, and change it later if necessary.
|
||||
*/
|
||||
ED_IndExpr (Expr);
|
||||
Expr->Type = ElementType;
|
||||
|
||||
/* An array element is actually a variable. So the rules for variables with
|
||||
** respect to the reference type apply: If it's an array, it is virtually
|
||||
** an rvalue address, otherwise it's an lvalue reference. (A function would
|
||||
** also be an rvalue address, but an array cannot contain functions).
|
||||
*/
|
||||
if (IsTypeArray (Expr->Type)) {
|
||||
ED_AddrExpr (Expr);
|
||||
}
|
||||
|
||||
/* Consume the closing bracket */
|
||||
ConsumeRBrack ();
|
||||
} else {
|
||||
/* Array and function types must be converted to pointer types */
|
||||
Expr->Type = PtrConversion (Expr->Type);
|
||||
if (AddDone < 0) {
|
||||
Error ("Invalid operands for binary operator '+'");
|
||||
} else {
|
||||
/* Array and function types must be converted to pointer types */
|
||||
Expr->Type = PtrConversion (Expr->Type);
|
||||
}
|
||||
}
|
||||
|
||||
/* Condition code not set */
|
||||
@ -3436,7 +3209,7 @@ static void parsesub (ExprDesc* Expr)
|
||||
|
||||
/* Remember the output queue position, then bring the value onto the stack */
|
||||
GetCodePos (&Mark1);
|
||||
LoadExpr (CF_NONE, Expr); /* --> primary register */
|
||||
LoadExpr (CF_NONE, Expr); /* --> primary register */
|
||||
GetCodePos (&Mark2);
|
||||
g_push (TypeOf (lhst), 0); /* --> stack */
|
||||
|
||||
@ -3658,7 +3431,7 @@ void hie8 (ExprDesc* Expr)
|
||||
ExprWithCheck (hie9, Expr);
|
||||
while (CurTok.Tok == TOK_PLUS || CurTok.Tok == TOK_MINUS) {
|
||||
if (CurTok.Tok == TOK_PLUS) {
|
||||
parseadd (Expr);
|
||||
parseadd (Expr, 0);
|
||||
} else {
|
||||
parsesub (Expr);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user