3 * Ullrich von Bassewitz, 21.06.1998
13 #include "debugflag.h"
20 #include "assignment.h"
32 #include "shiftexpr.h"
43 /*****************************************************************************/
45 /*****************************************************************************/
49 /* Generator attributes */
50 #define GEN_NOPUSH 0x01 /* Don't push lhs */
52 /* Map a generator function and its attributes to a token */
54 token_t Tok; /* Token to map to */
55 unsigned Flags; /* Flags for generator function */
56 void (*Func) (unsigned, unsigned long); /* Generator func */
59 /* Descriptors for the operations */
60 static GenDesc GenPASGN = { TOK_PLUS_ASSIGN, GEN_NOPUSH, g_add };
61 static GenDesc GenSASGN = { TOK_MINUS_ASSIGN, GEN_NOPUSH, g_sub };
62 static GenDesc GenMASGN = { TOK_MUL_ASSIGN, GEN_NOPUSH, g_mul };
63 static GenDesc GenDASGN = { TOK_DIV_ASSIGN, GEN_NOPUSH, g_div };
64 static GenDesc GenMOASGN = { TOK_MOD_ASSIGN, GEN_NOPUSH, g_mod };
65 static GenDesc GenSLASGN = { TOK_SHL_ASSIGN, GEN_NOPUSH, g_asl };
66 static GenDesc GenSRASGN = { TOK_SHR_ASSIGN, GEN_NOPUSH, g_asr };
67 static GenDesc GenAASGN = { TOK_AND_ASSIGN, GEN_NOPUSH, g_and };
68 static GenDesc GenXOASGN = { TOK_XOR_ASSIGN, GEN_NOPUSH, g_xor };
69 static GenDesc GenOASGN = { TOK_OR_ASSIGN, GEN_NOPUSH, g_or };
73 /*****************************************************************************/
74 /* Helper functions */
75 /*****************************************************************************/
79 static unsigned GlobalModeFlags (const ExprDesc* Expr)
80 /* Return the addressing mode flags for the given expression */
82 switch (ED_GetLoc (Expr)) {
83 case E_LOC_ABS: return CF_ABSOLUTE;
84 case E_LOC_GLOBAL: return CF_EXTERNAL;
85 case E_LOC_STATIC: return CF_STATIC;
86 case E_LOC_REGISTER: return CF_REGVAR;
87 case E_LOC_STACK: return CF_NONE;
88 case E_LOC_PRIMARY: return CF_NONE;
89 case E_LOC_EXPR: return CF_NONE;
90 case E_LOC_LITERAL: return CF_STATIC; /* Same as static */
92 Internal ("GlobalModeFlags: Invalid location flags value: 0x%04X", Expr->Flags);
100 void ExprWithCheck (void (*Func) (ExprDesc*), ExprDesc* Expr)
101 /* Call an expression function with checks. */
103 /* Remember the stack pointer */
104 int OldSP = StackPtr;
106 /* Call the expression function */
109 /* Do some checks if code generation is still constistent */
110 if (StackPtr != OldSP) {
113 "Code generation messed up!\n"
114 "StackPtr is %d, should be %d",
117 Internal ("StackPtr is %d, should be %d\n", StackPtr, OldSP);
124 void MarkedExprWithCheck (void (*Func) (ExprDesc*), ExprDesc* Expr)
125 /* Call an expression function with checks and record start and end of the
131 ExprWithCheck (Func, Expr);
133 ED_SetCodeRange (Expr, &Start, &End);
138 static Type* promoteint (Type* lhst, Type* rhst)
139 /* In an expression with two ints, return the type of the result */
141 /* Rules for integer types:
142 * - If one of the values is a long, the result is long.
143 * - If one of the values is unsigned, the result is also unsigned.
144 * - Otherwise the result is an int.
146 if (IsTypeLong (lhst) || IsTypeLong (rhst)) {
147 if (IsSignUnsigned (lhst) || IsSignUnsigned (rhst)) {
153 if (IsSignUnsigned (lhst) || IsSignUnsigned (rhst)) {
163 static unsigned typeadjust (ExprDesc* lhs, ExprDesc* rhs, int NoPush)
164 /* Adjust the two values for a binary operation. lhs is expected on stack or
165 * to be constant, rhs is expected to be in the primary register or constant.
166 * The function will put the type of the result into lhs and return the
167 * code generator flags for the operation.
168 * If NoPush is given, it is assumed that the operation does not expect the lhs
169 * to be on stack, and that lhs is in a register instead.
170 * Beware: The function does only accept int types.
173 unsigned ltype, rtype;
176 /* Get the type strings */
177 Type* lhst = lhs->Type;
178 Type* rhst = rhs->Type;
180 /* Generate type adjustment code if needed */
181 ltype = TypeOf (lhst);
182 if (ED_IsLocAbs (lhs)) {
186 /* Value is in primary register*/
189 rtype = TypeOf (rhst);
190 if (ED_IsLocAbs (rhs)) {
193 flags = g_typeadjust (ltype, rtype);
195 /* Set the type of the result */
196 lhs->Type = promoteint (lhst, rhst);
198 /* Return the code generator flags */
204 static const GenDesc* FindGen (token_t Tok, const GenDesc* Table)
205 /* Find a token in a generator table */
207 while (Table->Tok != TOK_INVALID) {
208 if (Table->Tok == Tok) {
218 static int TypeSpecAhead (void)
219 /* Return true if some sort of type is waiting (helper for cast and sizeof()
225 /* There's a type waiting if:
227 * We have an opening paren, and
228 * a. the next token is a type, or
229 * b. the next token is a type qualifier, or
230 * c. the next token is a typedef'd type
232 return CurTok.Tok == TOK_LPAREN && (
233 TokIsType (&NextTok) ||
234 TokIsTypeQual (&NextTok) ||
235 (NextTok.Tok == TOK_IDENT &&
236 (Entry = FindSym (NextTok.Ident)) != 0 &&
237 SymIsTypeDef (Entry)));
242 void PushAddr (const ExprDesc* Expr)
243 /* If the expression contains an address that was somehow evaluated,
244 * push this address on the stack. This is a helper function for all
245 * sorts of implicit or explicit assignment functions where the lvalue
246 * must be saved if it's not constant, before evaluating the rhs.
249 /* Get the address on stack if needed */
250 if (ED_IsLocExpr (Expr)) {
251 /* Push the address (always a pointer) */
258 /*****************************************************************************/
260 /*****************************************************************************/
264 static unsigned FunctionParamList (FuncDesc* Func, int IsFastcall)
265 /* Parse a function parameter list and pass the parameters to the called
266 * function. Depending on several criteria this may be done by just pushing
267 * each parameter separately, or creating the parameter frame once and then
268 * storing into this frame.
269 * The function returns the size of the parameters pushed.
274 /* Initialize variables */
275 SymEntry* Param = 0; /* Keep gcc silent */
276 unsigned ParamSize = 0; /* Size of parameters pushed */
277 unsigned ParamCount = 0; /* Number of parameters pushed */
278 unsigned FrameSize = 0; /* Size of parameter frame */
279 unsigned FrameParams = 0; /* Number of params in frame */
280 int FrameOffs = 0; /* Offset into parameter frame */
281 int Ellipsis = 0; /* Function is variadic */
283 /* As an optimization, we may allocate the complete parameter frame at
284 * once instead of pushing each parameter as it comes. We may do that,
287 * - optimizations that increase code size are enabled (allocating the
288 * stack frame at once gives usually larger code).
289 * - we have more than one parameter to push (don't count the last param
290 * for __fastcall__ functions).
292 * The FrameSize variable will contain a value > 0 if storing into a frame
293 * (instead of pushing) is enabled.
296 if (IS_Get (&CodeSizeFactor) >= 200) {
298 /* Calculate the number and size of the parameters */
299 FrameParams = Func->ParamCount;
300 FrameSize = Func->ParamSize;
301 if (FrameParams > 0 && IsFastcall) {
302 /* Last parameter is not pushed */
303 FrameSize -= CheckedSizeOf (Func->LastParam->Type);
307 /* Do we have more than one parameter in the frame? */
308 if (FrameParams > 1) {
309 /* Okeydokey, setup the frame */
310 FrameOffs = StackPtr;
312 StackPtr -= FrameSize;
314 /* Don't use a preallocated frame */
319 /* Parse the actual parameter list */
320 while (CurTok.Tok != TOK_RPAREN) {
324 /* Count arguments */
327 /* Fetch the pointer to the next argument, check for too many args */
328 if (ParamCount <= Func->ParamCount) {
329 /* Beware: If there are parameters with identical names, they
330 * cannot go into the same symbol table, which means that in this
331 * case of errorneous input, the number of nodes in the symbol
332 * table and ParamCount are NOT equal. We have to handle this case
333 * below to avoid segmentation violations. Since we know that this
334 * problem can only occur if there is more than one parameter,
335 * we will just use the last one.
337 if (ParamCount == 1) {
339 Param = Func->SymTab->SymHead;
340 } else if (Param->NextSym != 0) {
342 Param = Param->NextSym;
343 CHECK ((Param->Flags & SC_PARAM) != 0);
345 } else if (!Ellipsis) {
346 /* Too many arguments. Do we have an open param list? */
347 if ((Func->Flags & FD_VARIADIC) == 0) {
348 /* End of param list reached, no ellipsis */
349 Error ("Too many arguments in function call");
351 /* Assume an ellipsis even in case of errors to avoid an error
352 * message for each other argument.
357 /* Evaluate the parameter expression */
360 /* If we don't have an argument spec, accept anything, otherwise
361 * convert the actual argument to the type needed.
366 /* Convert the argument to the parameter type if needed */
367 TypeConversion (&Expr, Param->Type);
369 /* If we have a prototype, chars may be pushed as chars */
370 Flags |= CF_FORCECHAR;
374 /* No prototype available. Convert array to "pointer to first
375 * element", and function to "pointer to function".
377 Expr.Type = PtrConversion (Expr.Type);
381 /* Load the value into the primary if it is not already there */
382 LoadExpr (Flags, &Expr);
384 /* Use the type of the argument for the push */
385 Flags |= TypeOf (Expr.Type);
387 /* If this is a fastcall function, don't push the last argument */
388 if (ParamCount != Func->ParamCount || !IsFastcall) {
389 unsigned ArgSize = sizeofarg (Flags);
391 /* We have the space already allocated, store in the frame.
392 * Because of invalid type conversions (that have produced an
393 * error before), we can end up here with a non aligned stack
394 * frame. Since no output will be generated anyway, handle
395 * these cases gracefully instead of doing a CHECK.
397 if (FrameSize >= ArgSize) {
398 FrameSize -= ArgSize;
402 FrameOffs -= ArgSize;
404 g_putlocal (Flags | CF_NOKEEP, FrameOffs, Expr.IVal);
406 /* Push the argument */
407 g_push (Flags, Expr.IVal);
410 /* Calculate total parameter size */
411 ParamSize += ArgSize;
414 /* Check for end of argument list */
415 if (CurTok.Tok != TOK_COMMA) {
421 /* Check if we had enough parameters */
422 if (ParamCount < Func->ParamCount) {
423 Error ("Too few arguments in function call");
426 /* The function returns the size of all parameters pushed onto the stack.
427 * However, if there are parameters missing (which is an error and was
428 * flagged by the compiler) AND a stack frame was preallocated above,
429 * we would loose track of the stackpointer and generate an internal error
430 * later. So we correct the value by the parameters that should have been
431 * pushed to avoid an internal compiler error. Since an error was
432 * generated before, no code will be output anyway.
434 return ParamSize + FrameSize;
439 static void FunctionCall (ExprDesc* Expr)
440 /* Perform a function call. */
442 FuncDesc* Func; /* Function descriptor */
443 int IsFuncPtr; /* Flag */
444 unsigned ParamSize; /* Number of parameter bytes */
446 int PtrOffs = 0; /* Offset of function pointer on stack */
447 int IsFastcall = 0; /* True if it's a fast call function */
448 int PtrOnStack = 0; /* True if a pointer copy is on stack */
450 /* Skip the left paren */
453 /* Get a pointer to the function descriptor from the type string */
454 Func = GetFuncDesc (Expr->Type);
456 /* Handle function pointers transparently */
457 IsFuncPtr = IsTypeFuncPtr (Expr->Type);
460 /* Check wether it's a fastcall function that has parameters */
461 IsFastcall = IsQualFastcall (Expr->Type + 1) && (Func->ParamCount > 0);
463 /* Things may be difficult, depending on where the function pointer
464 * resides. If the function pointer is an expression of some sort
465 * (not a local or global variable), we have to evaluate this
466 * expression now and save the result for later. Since calls to
467 * function pointers may be nested, we must save it onto the stack.
468 * For fastcall functions we do also need to place a copy of the
469 * pointer on stack, since we cannot use a/x.
471 PtrOnStack = IsFastcall || !ED_IsConst (Expr);
474 /* Not a global or local variable, or a fastcall function. Load
475 * the pointer into the primary and mark it as an expression.
477 LoadExpr (CF_NONE, Expr);
478 ED_MakeRValExpr (Expr);
480 /* Remember the code position */
483 /* Push the pointer onto the stack and remember the offset */
489 /* Check for known standard functions and inline them */
490 if (Expr->Name != 0) {
491 int StdFunc = FindStdFunc ((const char*) Expr->Name);
493 /* Inline this function */
494 HandleStdFunc (StdFunc, Func, Expr);
499 /* If we didn't inline the function, get fastcall info */
500 IsFastcall = IsQualFastcall (Expr->Type);
503 /* Parse the parameter list */
504 ParamSize = FunctionParamList (Func, IsFastcall);
506 /* We need the closing paren here */
509 /* Special handling for function pointers */
512 /* If the function is not a fastcall function, load the pointer to
513 * the function into the primary.
517 /* Not a fastcall function - we may use the primary */
519 /* If we have no parameters, the pointer is still in the
520 * primary. Remove the code to push it and correct the
523 if (ParamSize == 0) {
527 /* Load from the saved copy */
528 g_getlocal (CF_PTR, PtrOffs);
531 /* Load from original location */
532 LoadExpr (CF_NONE, Expr);
535 /* Call the function */
536 g_callind (TypeOf (Expr->Type+1), ParamSize, PtrOffs);
540 /* Fastcall function. We cannot use the primary for the function
541 * pointer and must therefore use an offset to the stack location.
542 * Since fastcall functions may never be variadic, we can use the
543 * index register for this purpose.
545 g_callind (CF_LOCAL, ParamSize, PtrOffs);
548 /* If we have a pointer on stack, remove it */
550 g_space (- (int) sizeofarg (CF_PTR));
559 /* Normal function */
560 g_call (TypeOf (Expr->Type), (const char*) Expr->Name, ParamSize);
564 /* The function result is an rvalue in the primary register */
565 ED_MakeRValExpr (Expr);
566 Expr->Type = GetFuncReturn (Expr->Type);
571 static void Primary (ExprDesc* E)
572 /* This is the lowest level of the expression parser. */
576 /* Initialize fields in the expression stucture */
579 /* Character and integer constants. */
580 if (CurTok.Tok == TOK_ICONST || CurTok.Tok == TOK_CCONST) {
581 E->IVal = CurTok.IVal;
582 E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
583 E->Type = CurTok.Type;
588 /* Floating point constant */
589 if (CurTok.Tok == TOK_FCONST) {
590 E->FVal = CurTok.FVal;
591 E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
592 E->Type = CurTok.Type;
597 /* Process parenthesized subexpression by calling the whole parser
600 if (CurTok.Tok == TOK_LPAREN) {
607 /* If we run into an identifier in preprocessing mode, we assume that this
608 * is an undefined macro and replace it by a constant value of zero.
610 if (Preprocessing && CurTok.Tok == TOK_IDENT) {
612 ED_MakeConstAbsInt (E, 0);
616 /* All others may only be used if the expression evaluation is not called
617 * recursively by the preprocessor.
620 /* Illegal expression in PP mode */
621 Error ("Preprocessor expression expected");
622 ED_MakeConstAbsInt (E, 1);
626 switch (CurTok.Tok) {
629 /* Identifier. Get a pointer to the symbol table entry */
630 Sym = E->Sym = FindSym (CurTok.Ident);
632 /* Is the symbol known? */
635 /* We found the symbol - skip the name token */
638 /* Check for illegal symbol types */
639 CHECK ((Sym->Flags & SC_LABEL) != SC_LABEL);
640 if (Sym->Flags & SC_TYPE) {
641 /* Cannot use type symbols */
642 Error ("Variable identifier expected");
643 /* Assume an int type to make E valid */
644 E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
649 /* Mark the symbol as referenced */
650 Sym->Flags |= SC_REF;
652 /* The expression type is the symbol type */
655 /* Check for legal symbol types */
656 if ((Sym->Flags & SC_CONST) == SC_CONST) {
657 /* Enum or some other numeric constant */
658 E->Flags = E_LOC_ABS | E_RTYPE_RVAL;
659 E->IVal = Sym->V.ConstVal;
660 } else if ((Sym->Flags & SC_FUNC) == SC_FUNC) {
662 E->Flags = E_LOC_GLOBAL | E_RTYPE_LVAL;
663 E->Name = (unsigned long) Sym->Name;
664 } else if ((Sym->Flags & SC_AUTO) == SC_AUTO) {
665 /* Local variable. If this is a parameter for a variadic
666 * function, we have to add some address calculations, and the
667 * address is not const.
669 if ((Sym->Flags & SC_PARAM) == SC_PARAM && F_IsVariadic (CurrentFunc)) {
670 /* Variadic parameter */
671 g_leavariadic (Sym->V.Offs - F_GetParamSize (CurrentFunc));
672 E->Flags = E_LOC_EXPR | E_RTYPE_LVAL;
674 /* Normal parameter */
675 E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
676 E->IVal = Sym->V.Offs;
678 } else if ((Sym->Flags & SC_REGISTER) == SC_REGISTER) {
679 /* Register variable, zero page based */
680 E->Flags = E_LOC_REGISTER | E_RTYPE_LVAL;
681 E->Name = Sym->V.R.RegOffs;
682 } else if ((Sym->Flags & SC_STATIC) == SC_STATIC) {
683 /* Static variable */
684 if (Sym->Flags & (SC_EXTERN | SC_STORAGE)) {
685 E->Flags = E_LOC_GLOBAL | E_RTYPE_LVAL;
686 E->Name = (unsigned long) Sym->Name;
688 E->Flags = E_LOC_STATIC | E_RTYPE_LVAL;
689 E->Name = Sym->V.Label;
692 /* Local static variable */
693 E->Flags = E_LOC_STATIC | E_RTYPE_LVAL;
694 E->Name = Sym->V.Offs;
697 /* We've made all variables lvalues above. However, this is
698 * not always correct: An array is actually the address of its
699 * first element, which is a rvalue, and a function is a
700 * rvalue, too, because we cannot store anything in a function.
701 * So fix the flags depending on the type.
703 if (IsTypeArray (E->Type) || IsTypeFunc (E->Type)) {
709 /* We did not find the symbol. Remember the name, then skip it */
711 strcpy (Ident, CurTok.Ident);
714 /* IDENT is either an auto-declared function or an undefined variable. */
715 if (CurTok.Tok == TOK_LPAREN) {
716 /* C99 doesn't allow calls to undefined functions, so
717 * generate an error and otherwise a warning. Declare a
718 * function returning int. For that purpose, prepare a
719 * function signature for a function having an empty param
720 * list and returning int.
722 if (IS_Get (&Standard) >= STD_C99) {
723 Error ("Call to undefined function `%s'", Ident);
725 Warning ("Call to undefined function `%s'", Ident);
727 Sym = AddGlobalSym (Ident, GetImplicitFuncType(), SC_EXTERN | SC_REF | SC_FUNC);
729 E->Flags = E_LOC_GLOBAL | E_RTYPE_RVAL;
730 E->Name = (unsigned long) Sym->Name;
732 /* Undeclared Variable */
733 Sym = AddLocalSym (Ident, type_int, SC_AUTO | SC_REF, 0);
734 E->Flags = E_LOC_STACK | E_RTYPE_LVAL;
736 Error ("Undefined symbol: `%s'", Ident);
745 E->Type = GetCharArrayType (GetLiteralPoolOffs () - CurTok.IVal);
746 E->Flags = E_LOC_LITERAL | E_RTYPE_RVAL;
747 E->IVal = CurTok.IVal;
748 E->Name = LiteralPoolLabel;
755 E->Flags = E_LOC_EXPR | E_RTYPE_RVAL;
760 /* Register pseudo variable */
761 E->Type = type_uchar;
762 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
767 /* Register pseudo variable */
769 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
774 /* Register pseudo variable */
775 E->Type = type_ulong;
776 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
781 /* Illegal primary. Be sure to skip the token to avoid endless
784 Error ("Expression expected");
786 ED_MakeConstAbsInt (E, 1);
793 static void ArrayRef (ExprDesc* Expr)
794 /* Handle an array reference. This function needs a rewrite. */
804 /* Skip the bracket */
807 /* Get the type of left side */
810 /* We can apply a special treatment for arrays that have a const base
811 * address. This is true for most arrays and will produce a lot better
812 * code. Check if this is a const base address.
814 ConstBaseAddr = ED_IsRVal (Expr) &&
815 (ED_IsLocConst (Expr) || ED_IsLocStack (Expr));
817 /* If we have a constant base, we delay the address fetch */
819 if (!ConstBaseAddr) {
820 /* Get a pointer to the array into the primary */
821 LoadExpr (CF_NONE, Expr);
823 /* Get the array pointer on stack. Do not push more than 16
824 * bit, even if this value is greater, since we cannot handle
825 * other than 16bit stuff when doing indexing.
831 /* TOS now contains ptr to array elements. Get the subscript. */
832 MarkedExprWithCheck (hie0, &Subscript);
834 /* Check the types of array and subscript. We can either have a
835 * pointer/array to the left, in which case the subscript must be of an
836 * integer type, or we have an integer to the left, in which case the
837 * subscript must be a pointer/array.
838 * Since we do the necessary checking here, we can rely later on the
841 if (IsClassPtr (Expr->Type)) {
842 if (!IsClassInt (Subscript.Type)) {
843 Error ("Array subscript is not an integer");
844 /* To avoid any compiler errors, make the expression a valid int */
845 ED_MakeConstAbsInt (&Subscript, 0);
847 ElementType = Indirect (Expr->Type);
848 } else if (IsClassInt (Expr->Type)) {
849 if (!IsClassPtr (Subscript.Type)) {
850 Error ("Subscripted value is neither array nor pointer");
851 /* To avoid compiler errors, make the subscript a char[] at
854 ED_MakeConstAbs (&Subscript, 0, GetCharArrayType (1));
856 ElementType = Indirect (Subscript.Type);
858 Error ("Cannot subscript");
859 /* To avoid compiler errors, fake both the array and the subscript, so
860 * we can just proceed.
862 ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
863 ED_MakeConstAbsInt (&Subscript, 0);
864 ElementType = Indirect (Expr->Type);
867 /* If the subscript is a bit-field, load it and make it an rvalue */
868 if (ED_IsBitField (&Subscript)) {
869 LoadExpr (CF_NONE, &Subscript);
870 ED_MakeRValExpr (&Subscript);
873 /* Check if the subscript is constant absolute value */
874 if (ED_IsConstAbs (&Subscript) && ED_CodeRangeIsEmpty (&Subscript)) {
876 /* The array subscript is a numeric constant. If we had pushed the
877 * array base address onto the stack before, we can remove this value,
878 * since we can generate expression+offset.
880 if (!ConstBaseAddr) {
883 /* Get an array pointer into the primary */
884 LoadExpr (CF_NONE, Expr);
887 if (IsClassPtr (Expr->Type)) {
889 /* Lhs is pointer/array. Scale the subscript value according to
892 Subscript.IVal *= CheckedSizeOf (ElementType);
894 /* Remove the address load code */
897 /* In case of an array, we can adjust the offset of the expression
898 * already in Expr. If the base address was a constant, we can even
899 * remove the code that loaded the address into the primary.
901 if (IsTypeArray (Expr->Type)) {
903 /* Adjust the offset */
904 Expr->IVal += Subscript.IVal;
908 /* It's a pointer, so we do have to load it into the primary
909 * first (if it's not already there).
911 if (ConstBaseAddr || ED_IsLVal (Expr)) {
912 LoadExpr (CF_NONE, Expr);
913 ED_MakeRValExpr (Expr);
917 Expr->IVal = Subscript.IVal;
922 /* Scale the rhs value according to the element type */
923 g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
925 /* Add the subscript. Since arrays are indexed by integers,
926 * we will ignore the true type of the subscript here and
927 * use always an int. #### Use offset but beware of LoadExpr!
929 g_inc (CF_INT | CF_CONST, Subscript.IVal);
935 /* Array subscript is not constant. Load it into the primary */
937 LoadExpr (CF_NONE, &Subscript);
940 if (IsClassPtr (Expr->Type)) {
942 /* Indexing is based on unsigneds, so we will just use the integer
943 * portion of the index (which is in (e)ax, so there's no further
946 g_scale (CF_INT, CheckedSizeOf (ElementType));
950 /* Get the int value on top. If we come here, we're sure, both
951 * values are 16 bit (the first one was truncated if necessary
952 * and the second one is a pointer). Note: If ConstBaseAddr is
953 * true, we don't have a value on stack, so to "swap" both, just
954 * push the subscript.
958 LoadExpr (CF_NONE, Expr);
965 g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
969 /* The offset is now in the primary register. It we didn't have a
970 * constant base address for the lhs, the lhs address is already
971 * on stack, and we must add the offset. If the base address was
972 * constant, we call special functions to add the address to the
975 if (!ConstBaseAddr) {
977 /* The array base address is on stack and the subscript is in the
984 /* The subscript is in the primary, and the array base address is
985 * in Expr. If the subscript has itself a constant address, it is
986 * often a better idea to reverse again the order of the
987 * evaluation. This will generate better code if the subscript is
988 * a byte sized variable. But beware: This is only possible if the
989 * subscript was not scaled, that is, if this was a byte array
992 if ((ED_IsLocConst (&Subscript) || ED_IsLocStack (&Subscript)) &&
993 CheckedSizeOf (ElementType) == SIZEOF_CHAR) {
997 /* Reverse the order of evaluation */
998 if (CheckedSizeOf (Subscript.Type) == SIZEOF_CHAR) {
1003 RemoveCode (&Mark2);
1005 /* Get a pointer to the array into the primary. */
1006 LoadExpr (CF_NONE, Expr);
1008 /* Add the variable */
1009 if (ED_IsLocStack (&Subscript)) {
1010 g_addlocal (Flags, Subscript.IVal);
1012 Flags |= GlobalModeFlags (&Subscript);
1013 g_addstatic (Flags, Subscript.Name, Subscript.IVal);
1017 if (ED_IsLocAbs (Expr)) {
1018 /* Constant numeric address. Just add it */
1019 g_inc (CF_INT, Expr->IVal);
1020 } else if (ED_IsLocStack (Expr)) {
1021 /* Base address is a local variable address */
1022 if (IsTypeArray (Expr->Type)) {
1023 g_addaddr_local (CF_INT, Expr->IVal);
1025 g_addlocal (CF_PTR, Expr->IVal);
1028 /* Base address is a static variable address */
1029 unsigned Flags = CF_INT | GlobalModeFlags (Expr);
1030 if (ED_IsRVal (Expr)) {
1031 /* Add the address of the location */
1032 g_addaddr_static (Flags, Expr->Name, Expr->IVal);
1034 /* Add the contents of the location */
1035 g_addstatic (Flags, Expr->Name, Expr->IVal);
1043 /* The result is an expression in the primary */
1044 ED_MakeRValExpr (Expr);
1048 /* Result is of element type */
1049 Expr->Type = ElementType;
1051 /* An array element is actually a variable. So the rules for variables
1052 * with respect to the reference type apply: If it's an array, it is
1053 * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
1054 * but an array cannot contain functions).
1056 if (IsTypeArray (Expr->Type)) {
1062 /* Consume the closing bracket */
1068 static void StructRef (ExprDesc* Expr)
1069 /* Process struct field after . or ->. */
1075 /* Skip the token and check for an identifier */
1077 if (CurTok.Tok != TOK_IDENT) {
1078 Error ("Identifier expected");
1079 Expr->Type = type_int;
1083 /* Get the symbol table entry and check for a struct field */
1084 strcpy (Ident, CurTok.Ident);
1086 Field = FindStructField (Expr->Type, Ident);
1088 Error ("Struct/union has no field named `%s'", Ident);
1089 Expr->Type = type_int;
1093 /* If we have a struct pointer that is an lvalue and not already in the
1094 * primary, load it now.
1096 if (ED_IsLVal (Expr) && IsTypePtr (Expr->Type)) {
1098 /* Load into the primary */
1099 LoadExpr (CF_NONE, Expr);
1101 /* Make it an lvalue expression */
1102 ED_MakeLValExpr (Expr);
1105 /* Set the struct field offset */
1106 Expr->IVal += Field->V.Offs;
1108 /* The type is the type of the field plus any qualifiers from the struct */
1109 Q = GetQualifier (Expr->Type);
1110 if (GetQualifier (Field->Type) == (GetQualifier (Field->Type) | Q)) {
1111 Expr->Type = Field->Type;
1113 Expr->Type = TypeDup (Field->Type);
1117 /* An struct member is actually a variable. So the rules for variables
1118 * with respect to the reference type apply: If it's an array, it is
1119 * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
1120 * but a struct field cannot be a function).
1122 if (IsTypeArray (Expr->Type)) {
1128 /* Make the expression a bit field if necessary */
1129 if (SymIsBitField (Field)) {
1130 ED_MakeBitField (Expr, Field->V.B.BitOffs, Field->V.B.BitWidth);
1136 static void hie11 (ExprDesc *Expr)
1137 /* Handle compound types (structs and arrays) */
1139 /* Name value used in invalid function calls */
1140 static const char IllegalFunc[] = "illegal_function_call";
1142 /* Evaluate the lhs */
1145 /* Check for a rhs */
1146 while (CurTok.Tok == TOK_LBRACK || CurTok.Tok == TOK_LPAREN ||
1147 CurTok.Tok == TOK_DOT || CurTok.Tok == TOK_PTR_REF) {
1149 switch (CurTok.Tok) {
1152 /* Array reference */
1157 /* Function call. */
1158 if (!IsTypeFunc (Expr->Type) && !IsTypeFuncPtr (Expr->Type)) {
1159 /* Not a function */
1160 Error ("Illegal function call");
1161 /* Force the type to be a implicitly defined function, one
1162 * returning an int and taking any number of arguments.
1163 * Since we don't have a name, invent one.
1165 ED_MakeConstAbs (Expr, 0, GetImplicitFuncType ());
1166 Expr->Name = (long) IllegalFunc;
1168 /* Call the function */
1169 FunctionCall (Expr);
1173 if (!IsClassStruct (Expr->Type)) {
1174 Error ("Struct expected");
1180 /* If we have an array, convert it to pointer to first element */
1181 if (IsTypeArray (Expr->Type)) {
1182 Expr->Type = ArrayToPtr (Expr->Type);
1184 if (!IsClassPtr (Expr->Type) || !IsClassStruct (Indirect (Expr->Type))) {
1185 Error ("Struct pointer expected");
1191 Internal ("Invalid token in hie11: %d", CurTok.Tok);
1199 void Store (ExprDesc* Expr, const Type* StoreType)
1200 /* Store the primary register into the location denoted by Expr. If StoreType
1201 * is given, use this type when storing instead of Expr->Type. If StoreType
1202 * is NULL, use Expr->Type instead.
1207 /* If StoreType was not given, use Expr->Type instead */
1208 if (StoreType == 0) {
1209 StoreType = Expr->Type;
1212 /* Prepare the code generator flags */
1213 Flags = TypeOf (StoreType) | GlobalModeFlags (Expr);
1215 /* Do the store depending on the location */
1216 switch (ED_GetLoc (Expr)) {
1219 /* Absolute: numeric address or const */
1220 g_putstatic (Flags, Expr->IVal, 0);
1224 /* Global variable */
1225 g_putstatic (Flags, Expr->Name, Expr->IVal);
1230 /* Static variable or literal in the literal pool */
1231 g_putstatic (Flags, Expr->Name, Expr->IVal);
1234 case E_LOC_REGISTER:
1235 /* Register variable */
1236 g_putstatic (Flags, Expr->Name, Expr->IVal);
1240 /* Value on the stack */
1241 g_putlocal (Flags, Expr->IVal, 0);
1245 /* The primary register (value is already there) */
1249 /* An expression in the primary register */
1250 g_putind (Flags, Expr->IVal);
1254 Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
1257 /* Assume that each one of the stores will invalidate CC */
1258 ED_MarkAsUntested (Expr);
1263 static void PreInc (ExprDesc* Expr)
1264 /* Handle the preincrement operators */
1269 /* Skip the operator token */
1272 /* Evaluate the expression and check that it is an lvalue */
1274 if (!ED_IsLVal (Expr)) {
1275 Error ("Invalid lvalue");
1279 /* We cannot modify const values */
1280 if (IsQualConst (Expr->Type)) {
1281 Error ("Increment of read-only variable");
1284 /* Get the data type */
1285 Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
1287 /* Get the increment value in bytes */
1288 Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
1290 /* Check the location of the data */
1291 switch (ED_GetLoc (Expr)) {
1294 /* Absolute: numeric address or const */
1295 g_addeqstatic (Flags, Expr->IVal, 0, Val);
1299 /* Global variable */
1300 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1305 /* Static variable or literal in the literal pool */
1306 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1309 case E_LOC_REGISTER:
1310 /* Register variable */
1311 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1315 /* Value on the stack */
1316 g_addeqlocal (Flags, Expr->IVal, Val);
1320 /* The primary register */
1325 /* An expression in the primary register */
1326 g_addeqind (Flags, Expr->IVal, Val);
1330 Internal ("Invalid location in PreInc(): 0x%04X", ED_GetLoc (Expr));
1333 /* Result is an expression, no reference */
1334 ED_MakeRValExpr (Expr);
1339 static void PreDec (ExprDesc* Expr)
1340 /* Handle the predecrement operators */
1345 /* Skip the operator token */
1348 /* Evaluate the expression and check that it is an lvalue */
1350 if (!ED_IsLVal (Expr)) {
1351 Error ("Invalid lvalue");
1355 /* We cannot modify const values */
1356 if (IsQualConst (Expr->Type)) {
1357 Error ("Decrement of read-only variable");
1360 /* Get the data type */
1361 Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
1363 /* Get the increment value in bytes */
1364 Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
1366 /* Check the location of the data */
1367 switch (ED_GetLoc (Expr)) {
1370 /* Absolute: numeric address or const */
1371 g_subeqstatic (Flags, Expr->IVal, 0, Val);
1375 /* Global variable */
1376 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1381 /* Static variable or literal in the literal pool */
1382 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1385 case E_LOC_REGISTER:
1386 /* Register variable */
1387 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1391 /* Value on the stack */
1392 g_subeqlocal (Flags, Expr->IVal, Val);
1396 /* The primary register */
1401 /* An expression in the primary register */
1402 g_subeqind (Flags, Expr->IVal, Val);
1406 Internal ("Invalid location in PreDec(): 0x%04X", ED_GetLoc (Expr));
1409 /* Result is an expression, no reference */
1410 ED_MakeRValExpr (Expr);
1415 static void PostInc (ExprDesc* Expr)
1416 /* Handle the postincrement operator */
1422 /* The expression to increment must be an lvalue */
1423 if (!ED_IsLVal (Expr)) {
1424 Error ("Invalid lvalue");
1428 /* We cannot modify const values */
1429 if (IsQualConst (Expr->Type)) {
1430 Error ("Increment of read-only variable");
1433 /* Get the data type */
1434 Flags = TypeOf (Expr->Type);
1436 /* Push the address if needed */
1439 /* Fetch the value and save it (since it's the result of the expression) */
1440 LoadExpr (CF_NONE, Expr);
1441 g_save (Flags | CF_FORCECHAR);
1443 /* If we have a pointer expression, increment by the size of the type */
1444 if (IsTypePtr (Expr->Type)) {
1445 g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
1447 g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
1450 /* Store the result back */
1453 /* Restore the original value in the primary register */
1454 g_restore (Flags | CF_FORCECHAR);
1456 /* The result is always an expression, no reference */
1457 ED_MakeRValExpr (Expr);
1462 static void PostDec (ExprDesc* Expr)
1463 /* Handle the postdecrement operator */
1469 /* The expression to increment must be an lvalue */
1470 if (!ED_IsLVal (Expr)) {
1471 Error ("Invalid lvalue");
1475 /* We cannot modify const values */
1476 if (IsQualConst (Expr->Type)) {
1477 Error ("Decrement of read-only variable");
1480 /* Get the data type */
1481 Flags = TypeOf (Expr->Type);
1483 /* Push the address if needed */
1486 /* Fetch the value and save it (since it's the result of the expression) */
1487 LoadExpr (CF_NONE, Expr);
1488 g_save (Flags | CF_FORCECHAR);
1490 /* If we have a pointer expression, increment by the size of the type */
1491 if (IsTypePtr (Expr->Type)) {
1492 g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
1494 g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
1497 /* Store the result back */
1500 /* Restore the original value in the primary register */
1501 g_restore (Flags | CF_FORCECHAR);
1503 /* The result is always an expression, no reference */
1504 ED_MakeRValExpr (Expr);
1509 static void UnaryOp (ExprDesc* Expr)
1510 /* Handle unary -/+ and ~ */
1514 /* Remember the operator token and skip it */
1515 token_t Tok = CurTok.Tok;
1518 /* Get the expression */
1521 /* We can only handle integer types */
1522 if (!IsClassInt (Expr->Type)) {
1523 Error ("Argument must have integer type");
1524 ED_MakeConstAbsInt (Expr, 1);
1527 /* Check for a constant expression */
1528 if (ED_IsConstAbs (Expr)) {
1529 /* Value is constant */
1531 case TOK_MINUS: Expr->IVal = -Expr->IVal; break;
1532 case TOK_PLUS: break;
1533 case TOK_COMP: Expr->IVal = ~Expr->IVal; break;
1534 default: Internal ("Unexpected token: %d", Tok);
1537 /* Value is not constant */
1538 LoadExpr (CF_NONE, Expr);
1540 /* Get the type of the expression */
1541 Flags = TypeOf (Expr->Type);
1543 /* Handle the operation */
1545 case TOK_MINUS: g_neg (Flags); break;
1546 case TOK_PLUS: break;
1547 case TOK_COMP: g_com (Flags); break;
1548 default: Internal ("Unexpected token: %d", Tok);
1551 /* The result is a rvalue in the primary */
1552 ED_MakeRValExpr (Expr);
1558 void hie10 (ExprDesc* Expr)
1559 /* Handle ++, --, !, unary - etc. */
1563 switch (CurTok.Tok) {
1581 if (evalexpr (CF_NONE, hie10, Expr) == 0) {
1582 /* Constant expression */
1583 Expr->IVal = !Expr->IVal;
1585 g_bneg (TypeOf (Expr->Type));
1586 ED_MakeRValExpr (Expr);
1587 ED_TestDone (Expr); /* bneg will set cc */
1593 ExprWithCheck (hie10, Expr);
1594 if (ED_IsLVal (Expr) || !(ED_IsLocConst (Expr) || ED_IsLocStack (Expr))) {
1595 /* Not a const, load it into the primary and make it a
1598 LoadExpr (CF_NONE, Expr);
1599 ED_MakeRValExpr (Expr);
1601 /* If the expression is already a pointer to function, the
1602 * additional dereferencing operator must be ignored. A function
1603 * itself is represented as "pointer to function", so any number
1604 * of dereference operators is legal, since the result will
1605 * always be converted to "pointer to function".
1607 if (IsTypeFuncPtr (Expr->Type) || IsTypeFunc (Expr->Type)) {
1608 /* Expression not storable */
1611 if (IsClassPtr (Expr->Type)) {
1612 Expr->Type = Indirect (Expr->Type);
1614 Error ("Illegal indirection");
1616 /* The * operator yields an lvalue */
1623 ExprWithCheck (hie10, Expr);
1624 /* The & operator may be applied to any lvalue, and it may be
1625 * applied to functions, even if they're no lvalues.
1627 if (ED_IsRVal (Expr) && !IsTypeFunc (Expr->Type) && !IsTypeArray (Expr->Type)) {
1628 Error ("Illegal address");
1630 if (ED_IsBitField (Expr)) {
1631 Error ("Cannot take address of bit-field");
1632 /* Do it anyway, just to avoid further warnings */
1633 Expr->Flags &= ~E_BITFIELD;
1635 Expr->Type = PointerTo (Expr->Type);
1636 /* The & operator yields an rvalue */
1643 if (TypeSpecAhead ()) {
1646 Size = CheckedSizeOf (ParseType (T));
1649 /* Remember the output queue pointer */
1653 Size = CheckedSizeOf (Expr->Type);
1654 /* Remove any generated code */
1657 ED_MakeConstAbs (Expr, Size, type_size_t);
1658 ED_MarkAsUntested (Expr);
1662 if (TypeSpecAhead ()) {
1672 /* Handle post increment */
1673 switch (CurTok.Tok) {
1674 case TOK_INC: PostInc (Expr); break;
1675 case TOK_DEC: PostDec (Expr); break;
1686 static void hie_internal (const GenDesc* Ops, /* List of generators */
1688 void (*hienext) (ExprDesc*),
1690 /* Helper function */
1696 token_t Tok; /* The operator token */
1697 unsigned ltype, type;
1698 int rconst; /* Operand is a constant */
1704 while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
1706 /* Tell the caller that we handled it's ops */
1709 /* All operators that call this function expect an int on the lhs */
1710 if (!IsClassInt (Expr->Type)) {
1711 Error ("Integer expression expected");
1712 /* To avoid further errors, make Expr a valid int expression */
1713 ED_MakeConstAbsInt (Expr, 1);
1716 /* Remember the operator token, then skip it */
1720 /* Get the lhs on stack */
1721 GetCodePos (&Mark1);
1722 ltype = TypeOf (Expr->Type);
1723 if (ED_IsConstAbs (Expr)) {
1724 /* Constant value */
1725 GetCodePos (&Mark2);
1726 g_push (ltype | CF_CONST, Expr->IVal);
1728 /* Value not constant */
1729 LoadExpr (CF_NONE, Expr);
1730 GetCodePos (&Mark2);
1734 /* Get the right hand side */
1735 MarkedExprWithCheck (hienext, &Expr2);
1737 /* Check for a constant expression */
1738 rconst = (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2));
1740 /* Not constant, load into the primary */
1741 LoadExpr (CF_NONE, &Expr2);
1744 /* Check the type of the rhs */
1745 if (!IsClassInt (Expr2.Type)) {
1746 Error ("Integer expression expected");
1749 /* Check for const operands */
1750 if (ED_IsConstAbs (Expr) && rconst) {
1752 /* Both operands are constant, remove the generated code */
1753 RemoveCode (&Mark1);
1755 /* Get the type of the result */
1756 Expr->Type = promoteint (Expr->Type, Expr2.Type);
1758 /* Handle the op differently for signed and unsigned types */
1759 if (IsSignSigned (Expr->Type)) {
1761 /* Evaluate the result for signed operands */
1762 signed long Val1 = Expr->IVal;
1763 signed long Val2 = Expr2.IVal;
1766 Expr->IVal = (Val1 | Val2);
1769 Expr->IVal = (Val1 ^ Val2);
1772 Expr->IVal = (Val1 & Val2);
1775 Expr->IVal = (Val1 * Val2);
1779 Error ("Division by zero");
1780 Expr->IVal = 0x7FFFFFFF;
1782 Expr->IVal = (Val1 / Val2);
1787 Error ("Modulo operation with zero");
1790 Expr->IVal = (Val1 % Val2);
1794 Internal ("hie_internal: got token 0x%X\n", Tok);
1798 /* Evaluate the result for unsigned operands */
1799 unsigned long Val1 = Expr->IVal;
1800 unsigned long Val2 = Expr2.IVal;
1803 Expr->IVal = (Val1 | Val2);
1806 Expr->IVal = (Val1 ^ Val2);
1809 Expr->IVal = (Val1 & Val2);
1812 Expr->IVal = (Val1 * Val2);
1816 Error ("Division by zero");
1817 Expr->IVal = 0xFFFFFFFF;
1819 Expr->IVal = (Val1 / Val2);
1824 Error ("Modulo operation with zero");
1827 Expr->IVal = (Val1 % Val2);
1831 Internal ("hie_internal: got token 0x%X\n", Tok);
1837 /* If the right hand side is constant, and the generator function
1838 * expects the lhs in the primary, remove the push of the primary
1841 unsigned rtype = TypeOf (Expr2.Type);
1844 /* Second value is constant - check for div */
1847 if (Tok == TOK_DIV && Expr2.IVal == 0) {
1848 Error ("Division by zero");
1849 } else if (Tok == TOK_MOD && Expr2.IVal == 0) {
1850 Error ("Modulo operation with zero");
1852 if ((Gen->Flags & GEN_NOPUSH) != 0) {
1853 RemoveCode (&Mark2);
1854 ltype |= CF_REG; /* Value is in register */
1858 /* Determine the type of the operation result. */
1859 type |= g_typeadjust (ltype, rtype);
1860 Expr->Type = promoteint (Expr->Type, Expr2.Type);
1863 Gen->Func (type, Expr2.IVal);
1865 /* We have a rvalue in the primary now */
1866 ED_MakeRValExpr (Expr);
1873 static void hie_compare (const GenDesc* Ops, /* List of generators */
1875 void (*hienext) (ExprDesc*))
1876 /* Helper function for the compare operators */
1882 token_t Tok; /* The operator token */
1884 int rconst; /* Operand is a constant */
1889 while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
1891 /* Remember the operator token, then skip it */
1895 /* Get the lhs on stack */
1896 GetCodePos (&Mark1);
1897 ltype = TypeOf (Expr->Type);
1898 if (ED_IsConstAbs (Expr)) {
1899 /* Constant value */
1900 GetCodePos (&Mark2);
1901 g_push (ltype | CF_CONST, Expr->IVal);
1903 /* Value not constant */
1904 LoadExpr (CF_NONE, Expr);
1905 GetCodePos (&Mark2);
1909 /* Get the right hand side */
1910 MarkedExprWithCheck (hienext, &Expr2);
1912 /* Check for a constant expression */
1913 rconst = (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2));
1915 /* Not constant, load into the primary */
1916 LoadExpr (CF_NONE, &Expr2);
1919 /* Make sure, the types are compatible */
1920 if (IsClassInt (Expr->Type)) {
1921 if (!IsClassInt (Expr2.Type) && !(IsClassPtr(Expr2.Type) && ED_IsNullPtr(Expr))) {
1922 Error ("Incompatible types");
1924 } else if (IsClassPtr (Expr->Type)) {
1925 if (IsClassPtr (Expr2.Type)) {
1926 /* Both pointers are allowed in comparison if they point to
1927 * the same type, or if one of them is a void pointer.
1929 Type* left = Indirect (Expr->Type);
1930 Type* right = Indirect (Expr2.Type);
1931 if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
1932 /* Incomatible pointers */
1933 Error ("Incompatible types");
1935 } else if (!ED_IsNullPtr (&Expr2)) {
1936 Error ("Incompatible types");
1940 /* Check for const operands */
1941 if (ED_IsConstAbs (Expr) && rconst) {
1943 /* If the result is constant, this is suspicious when not in
1944 * preprocessor mode.
1946 if (!Preprocessing) {
1947 Warning ("Result of comparison is constant");
1950 /* Both operands are constant, remove the generated code */
1951 RemoveCode (&Mark1);
1953 /* Determine if this is a signed or unsigned compare */
1954 if (IsClassInt (Expr->Type) && IsSignSigned (Expr->Type) &&
1955 IsClassInt (Expr2.Type) && IsSignSigned (Expr2.Type)) {
1957 /* Evaluate the result for signed operands */
1958 signed long Val1 = Expr->IVal;
1959 signed long Val2 = Expr2.IVal;
1961 case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
1962 case TOK_NE: Expr->IVal = (Val1 != Val2); break;
1963 case TOK_LT: Expr->IVal = (Val1 < Val2); break;
1964 case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
1965 case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
1966 case TOK_GT: Expr->IVal = (Val1 > Val2); break;
1967 default: Internal ("hie_compare: got token 0x%X\n", Tok);
1972 /* Evaluate the result for unsigned operands */
1973 unsigned long Val1 = Expr->IVal;
1974 unsigned long Val2 = Expr2.IVal;
1976 case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
1977 case TOK_NE: Expr->IVal = (Val1 != Val2); break;
1978 case TOK_LT: Expr->IVal = (Val1 < Val2); break;
1979 case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
1980 case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
1981 case TOK_GT: Expr->IVal = (Val1 > Val2); break;
1982 default: Internal ("hie_compare: got token 0x%X\n", Tok);
1988 /* If the right hand side is constant, and the generator function
1989 * expects the lhs in the primary, remove the push of the primary
1995 if ((Gen->Flags & GEN_NOPUSH) != 0) {
1996 RemoveCode (&Mark2);
1997 ltype |= CF_REG; /* Value is in register */
2001 /* Determine the type of the operation result. If the left
2002 * operand is of type char and the right is a constant, or
2003 * if both operands are of type char, we will encode the
2004 * operation as char operation. Otherwise the default
2005 * promotions are used.
2007 if (IsTypeChar (Expr->Type) && (IsTypeChar (Expr2.Type) || rconst)) {
2009 if (IsSignUnsigned (Expr->Type) || IsSignUnsigned (Expr2.Type)) {
2010 flags |= CF_UNSIGNED;
2013 flags |= CF_FORCECHAR;
2016 unsigned rtype = TypeOf (Expr2.Type) | (flags & CF_CONST);
2017 flags |= g_typeadjust (ltype, rtype);
2021 Gen->Func (flags, Expr2.IVal);
2023 /* The result is an rvalue in the primary */
2024 ED_MakeRValExpr (Expr);
2027 /* Result type is always int */
2028 Expr->Type = type_int;
2030 /* Condition codes are set */
2037 static void hie9 (ExprDesc *Expr)
2038 /* Process * and / operators. */
2040 static const GenDesc hie9_ops[] = {
2041 { TOK_STAR, GEN_NOPUSH, g_mul },
2042 { TOK_DIV, GEN_NOPUSH, g_div },
2043 { TOK_MOD, GEN_NOPUSH, g_mod },
2044 { TOK_INVALID, 0, 0 }
2048 hie_internal (hie9_ops, Expr, hie10, &UsedGen);
2053 static void parseadd (ExprDesc* Expr)
2054 /* Parse an expression with the binary plus operator. Expr contains the
2055 * unprocessed left hand side of the expression and will contain the
2056 * result of the expression on return.
2060 unsigned flags; /* Operation flags */
2061 CodeMark Mark; /* Remember code position */
2062 Type* lhst; /* Type of left hand side */
2063 Type* rhst; /* Type of right hand side */
2066 /* Skip the PLUS token */
2069 /* Get the left hand side type, initialize operation flags */
2073 /* Check for constness on both sides */
2074 if (ED_IsConst (Expr)) {
2076 /* The left hand side is a constant of some sort. Good. Get rhs */
2078 if (ED_IsConstAbs (&Expr2)) {
2080 /* Right hand side is a constant numeric value. Get the rhs type */
2083 /* Both expressions are constants. Check for pointer arithmetic */
2084 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2085 /* Left is pointer, right is int, must scale rhs */
2086 Expr->IVal += Expr2.IVal * CheckedPSizeOf (lhst);
2087 /* Result type is a pointer */
2088 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2089 /* Left is int, right is pointer, must scale lhs */
2090 Expr->IVal = Expr->IVal * CheckedPSizeOf (rhst) + Expr2.IVal;
2091 /* Result type is a pointer */
2092 Expr->Type = Expr2.Type;
2093 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2094 /* Integer addition */
2095 Expr->IVal += Expr2.IVal;
2096 typeadjust (Expr, &Expr2, 1);
2099 Error ("Invalid operands for binary operator `+'");
2104 /* lhs is a constant and rhs is not constant. Load rhs into
2107 LoadExpr (CF_NONE, &Expr2);
2109 /* Beware: The check above (for lhs) lets not only pass numeric
2110 * constants, but also constant addresses (labels), maybe even
2111 * with an offset. We have to check for that here.
2114 /* First, get the rhs type. */
2118 if (ED_IsLocAbs (Expr)) {
2119 /* A numerical constant */
2122 /* Constant address label */
2123 flags |= GlobalModeFlags (Expr) | CF_CONSTADDR;
2126 /* Check for pointer arithmetic */
2127 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2128 /* Left is pointer, right is int, must scale rhs */
2129 g_scale (CF_INT, CheckedPSizeOf (lhst));
2130 /* Operate on pointers, result type is a pointer */
2132 /* Generate the code for the add */
2133 if (ED_GetLoc (Expr) == E_LOC_ABS) {
2134 /* Numeric constant */
2135 g_inc (flags, Expr->IVal);
2137 /* Constant address */
2138 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2140 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2142 /* Left is int, right is pointer, must scale lhs. */
2143 unsigned ScaleFactor = CheckedPSizeOf (rhst);
2145 /* Operate on pointers, result type is a pointer */
2147 Expr->Type = Expr2.Type;
2149 /* Since we do already have rhs in the primary, if lhs is
2150 * not a numeric constant, and the scale factor is not one
2151 * (no scaling), we must take the long way over the stack.
2153 if (ED_IsLocAbs (Expr)) {
2154 /* Numeric constant, scale lhs */
2155 Expr->IVal *= ScaleFactor;
2156 /* Generate the code for the add */
2157 g_inc (flags, Expr->IVal);
2158 } else if (ScaleFactor == 1) {
2159 /* Constant address but no need to scale */
2160 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2162 /* Constant address that must be scaled */
2163 g_push (TypeOf (Expr2.Type), 0); /* rhs --> stack */
2164 g_getimmed (flags, Expr->Name, Expr->IVal);
2165 g_scale (CF_PTR, ScaleFactor);
2168 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2169 /* Integer addition */
2170 flags |= typeadjust (Expr, &Expr2, 1);
2171 /* Generate the code for the add */
2172 if (ED_IsLocAbs (Expr)) {
2173 /* Numeric constant */
2174 g_inc (flags, Expr->IVal);
2176 /* Constant address */
2177 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2181 Error ("Invalid operands for binary operator `+'");
2185 /* Result is a rvalue in primary register */
2186 ED_MakeRValExpr (Expr);
2191 /* Left hand side is not constant. Get the value onto the stack. */
2192 LoadExpr (CF_NONE, Expr); /* --> primary register */
2194 g_push (TypeOf (Expr->Type), 0); /* --> stack */
2196 /* Evaluate the rhs */
2197 MarkedExprWithCheck (hie9, &Expr2);
2199 /* Check for a constant rhs expression */
2200 if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
2202 /* Right hand side is a constant. Get the rhs type */
2205 /* Remove pushed value from stack */
2208 /* Check for pointer arithmetic */
2209 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2210 /* Left is pointer, right is int, must scale rhs */
2211 Expr2.IVal *= CheckedPSizeOf (lhst);
2212 /* Operate on pointers, result type is a pointer */
2214 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2215 /* Left is int, right is pointer, must scale lhs (ptr only) */
2216 g_scale (CF_INT | CF_CONST, CheckedPSizeOf (rhst));
2217 /* Operate on pointers, result type is a pointer */
2219 Expr->Type = Expr2.Type;
2220 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2221 /* Integer addition */
2222 flags = typeadjust (Expr, &Expr2, 1);
2225 Error ("Invalid operands for binary operator `+'");
2229 /* Generate code for the add */
2230 g_inc (flags | CF_CONST, Expr2.IVal);
2234 /* Not constant, load into the primary */
2235 LoadExpr (CF_NONE, &Expr2);
2237 /* lhs and rhs are not constant. Get the rhs type. */
2240 /* Check for pointer arithmetic */
2241 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2242 /* Left is pointer, right is int, must scale rhs */
2243 g_scale (CF_INT, CheckedPSizeOf (lhst));
2244 /* Operate on pointers, result type is a pointer */
2246 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2247 /* Left is int, right is pointer, must scale lhs */
2248 g_tosint (TypeOf (rhst)); /* Make sure, TOS is int */
2249 g_swap (CF_INT); /* Swap TOS and primary */
2250 g_scale (CF_INT, CheckedPSizeOf (rhst));
2251 /* Operate on pointers, result type is a pointer */
2253 Expr->Type = Expr2.Type;
2254 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2255 /* Integer addition. Note: Result is never constant.
2256 * Problem here is that typeadjust does not know if the
2257 * variable is an rvalue or lvalue, so if both operands
2258 * are dereferenced constant numeric addresses, typeadjust
2259 * thinks the operation works on constants. Removing
2260 * CF_CONST here means handling the symptoms, however, the
2261 * whole parser is such a mess that I fear to break anything
2262 * when trying to apply another solution.
2264 flags = typeadjust (Expr, &Expr2, 0) & ~CF_CONST;
2267 Error ("Invalid operands for binary operator `+'");
2271 /* Generate code for the add */
2276 /* Result is a rvalue in primary register */
2277 ED_MakeRValExpr (Expr);
2280 /* Condition codes not set */
2281 ED_MarkAsUntested (Expr);
2287 static void parsesub (ExprDesc* Expr)
2288 /* Parse an expression with the binary minus operator. Expr contains the
2289 * unprocessed left hand side of the expression and will contain the
2290 * result of the expression on return.
2294 unsigned flags; /* Operation flags */
2295 Type* lhst; /* Type of left hand side */
2296 Type* rhst; /* Type of right hand side */
2297 CodeMark Mark1; /* Save position of output queue */
2298 CodeMark Mark2; /* Another position in the queue */
2299 int rscale; /* Scale factor for the result */
2302 /* Skip the MINUS token */
2305 /* Get the left hand side type, initialize operation flags */
2307 rscale = 1; /* Scale by 1, that is, don't scale */
2309 /* Remember the output queue position, then bring the value onto the stack */
2310 GetCodePos (&Mark1);
2311 LoadExpr (CF_NONE, Expr); /* --> primary register */
2312 GetCodePos (&Mark2);
2313 g_push (TypeOf (lhst), 0); /* --> stack */
2315 /* Parse the right hand side */
2316 MarkedExprWithCheck (hie9, &Expr2);
2318 /* Check for a constant rhs expression */
2319 if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
2321 /* The right hand side is constant. Get the rhs type. */
2324 /* Check left hand side */
2325 if (ED_IsConstAbs (Expr)) {
2327 /* Both sides are constant, remove generated code */
2328 RemoveCode (&Mark1);
2330 /* Check for pointer arithmetic */
2331 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2332 /* Left is pointer, right is int, must scale rhs */
2333 Expr->IVal -= Expr2.IVal * CheckedPSizeOf (lhst);
2334 /* Operate on pointers, result type is a pointer */
2335 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2336 /* Left is pointer, right is pointer, must scale result */
2337 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2338 Error ("Incompatible pointer types");
2340 Expr->IVal = (Expr->IVal - Expr2.IVal) /
2341 CheckedPSizeOf (lhst);
2343 /* Operate on pointers, result type is an integer */
2344 Expr->Type = type_int;
2345 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2346 /* Integer subtraction */
2347 typeadjust (Expr, &Expr2, 1);
2348 Expr->IVal -= Expr2.IVal;
2351 Error ("Invalid operands for binary operator `-'");
2354 /* Result is constant, condition codes not set */
2355 ED_MarkAsUntested (Expr);
2359 /* Left hand side is not constant, right hand side is.
2360 * Remove pushed value from stack.
2362 RemoveCode (&Mark2);
2364 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2365 /* Left is pointer, right is int, must scale rhs */
2366 Expr2.IVal *= CheckedPSizeOf (lhst);
2367 /* Operate on pointers, result type is a pointer */
2369 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2370 /* Left is pointer, right is pointer, must scale result */
2371 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2372 Error ("Incompatible pointer types");
2374 rscale = CheckedPSizeOf (lhst);
2376 /* Operate on pointers, result type is an integer */
2378 Expr->Type = type_int;
2379 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2380 /* Integer subtraction */
2381 flags = typeadjust (Expr, &Expr2, 1);
2384 Error ("Invalid operands for binary operator `-'");
2388 /* Do the subtraction */
2389 g_dec (flags | CF_CONST, Expr2.IVal);
2391 /* If this was a pointer subtraction, we must scale the result */
2393 g_scale (flags, -rscale);
2396 /* Result is a rvalue in the primary register */
2397 ED_MakeRValExpr (Expr);
2398 ED_MarkAsUntested (Expr);
2404 /* Not constant, load into the primary */
2405 LoadExpr (CF_NONE, &Expr2);
2407 /* Right hand side is not constant. Get the rhs type. */
2410 /* Check for pointer arithmetic */
2411 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2412 /* Left is pointer, right is int, must scale rhs */
2413 g_scale (CF_INT, CheckedPSizeOf (lhst));
2414 /* Operate on pointers, result type is a pointer */
2416 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2417 /* Left is pointer, right is pointer, must scale result */
2418 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2419 Error ("Incompatible pointer types");
2421 rscale = CheckedPSizeOf (lhst);
2423 /* Operate on pointers, result type is an integer */
2425 Expr->Type = type_int;
2426 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2427 /* Integer subtraction. If the left hand side descriptor says that
2428 * the lhs is const, we have to remove this mark, since this is no
2429 * longer true, lhs is on stack instead.
2431 if (ED_IsLocAbs (Expr)) {
2432 ED_MakeRValExpr (Expr);
2434 /* Adjust operand types */
2435 flags = typeadjust (Expr, &Expr2, 0);
2438 Error ("Invalid operands for binary operator `-'");
2442 /* Generate code for the sub (the & is a hack here) */
2443 g_sub (flags & ~CF_CONST, 0);
2445 /* If this was a pointer subtraction, we must scale the result */
2447 g_scale (flags, -rscale);
2450 /* Result is a rvalue in the primary register */
2451 ED_MakeRValExpr (Expr);
2452 ED_MarkAsUntested (Expr);
2458 void hie8 (ExprDesc* Expr)
2459 /* Process + and - binary operators. */
2462 while (CurTok.Tok == TOK_PLUS || CurTok.Tok == TOK_MINUS) {
2463 if (CurTok.Tok == TOK_PLUS) {
2473 static void hie6 (ExprDesc* Expr)
2474 /* Handle greater-than type comparators */
2476 static const GenDesc hie6_ops [] = {
2477 { TOK_LT, GEN_NOPUSH, g_lt },
2478 { TOK_LE, GEN_NOPUSH, g_le },
2479 { TOK_GE, GEN_NOPUSH, g_ge },
2480 { TOK_GT, GEN_NOPUSH, g_gt },
2481 { TOK_INVALID, 0, 0 }
2483 hie_compare (hie6_ops, Expr, ShiftExpr);
2488 static void hie5 (ExprDesc* Expr)
2489 /* Handle == and != */
2491 static const GenDesc hie5_ops[] = {
2492 { TOK_EQ, GEN_NOPUSH, g_eq },
2493 { TOK_NE, GEN_NOPUSH, g_ne },
2494 { TOK_INVALID, 0, 0 }
2496 hie_compare (hie5_ops, Expr, hie6);
2501 static void hie4 (ExprDesc* Expr)
2502 /* Handle & (bitwise and) */
2504 static const GenDesc hie4_ops[] = {
2505 { TOK_AND, GEN_NOPUSH, g_and },
2506 { TOK_INVALID, 0, 0 }
2510 hie_internal (hie4_ops, Expr, hie5, &UsedGen);
2515 static void hie3 (ExprDesc* Expr)
2516 /* Handle ^ (bitwise exclusive or) */
2518 static const GenDesc hie3_ops[] = {
2519 { TOK_XOR, GEN_NOPUSH, g_xor },
2520 { TOK_INVALID, 0, 0 }
2524 hie_internal (hie3_ops, Expr, hie4, &UsedGen);
2529 static void hie2 (ExprDesc* Expr)
2530 /* Handle | (bitwise or) */
2532 static const GenDesc hie2_ops[] = {
2533 { TOK_OR, GEN_NOPUSH, g_or },
2534 { TOK_INVALID, 0, 0 }
2538 hie_internal (hie2_ops, Expr, hie3, &UsedGen);
2543 static void hieAndPP (ExprDesc* Expr)
2544 /* Process "exp && exp" in preprocessor mode (that is, when the parser is
2545 * called recursively from the preprocessor.
2550 ConstAbsIntExpr (hie2, Expr);
2551 while (CurTok.Tok == TOK_BOOL_AND) {
2557 ConstAbsIntExpr (hie2, &Expr2);
2559 /* Combine the two */
2560 Expr->IVal = (Expr->IVal && Expr2.IVal);
2566 static void hieOrPP (ExprDesc *Expr)
2567 /* Process "exp || exp" in preprocessor mode (that is, when the parser is
2568 * called recursively from the preprocessor.
2573 ConstAbsIntExpr (hieAndPP, Expr);
2574 while (CurTok.Tok == TOK_BOOL_OR) {
2580 ConstAbsIntExpr (hieAndPP, &Expr2);
2582 /* Combine the two */
2583 Expr->IVal = (Expr->IVal || Expr2.IVal);
2589 static void hieAnd (ExprDesc* Expr, unsigned TrueLab, int* BoolOp)
2590 /* Process "exp && exp" */
2596 if (CurTok.Tok == TOK_BOOL_AND) {
2598 /* Tell our caller that we're evaluating a boolean */
2601 /* Get a label that we will use for false expressions */
2602 FalseLab = GetLocalLabel ();
2604 /* If the expr hasn't set condition codes, set the force-test flag */
2605 if (!ED_IsTested (Expr)) {
2606 ED_MarkForTest (Expr);
2609 /* Load the value */
2610 LoadExpr (CF_FORCECHAR, Expr);
2612 /* Generate the jump */
2613 g_falsejump (CF_NONE, FalseLab);
2615 /* Parse more boolean and's */
2616 while (CurTok.Tok == TOK_BOOL_AND) {
2623 if (!ED_IsTested (&Expr2)) {
2624 ED_MarkForTest (&Expr2);
2626 LoadExpr (CF_FORCECHAR, &Expr2);
2628 /* Do short circuit evaluation */
2629 if (CurTok.Tok == TOK_BOOL_AND) {
2630 g_falsejump (CF_NONE, FalseLab);
2632 /* Last expression - will evaluate to true */
2633 g_truejump (CF_NONE, TrueLab);
2637 /* Define the false jump label here */
2638 g_defcodelabel (FalseLab);
2640 /* The result is an rvalue in primary */
2641 ED_MakeRValExpr (Expr);
2642 ED_TestDone (Expr); /* Condition codes are set */
2648 static void hieOr (ExprDesc *Expr)
2649 /* Process "exp || exp". */
2652 int BoolOp = 0; /* Did we have a boolean op? */
2653 int AndOp; /* Did we have a && operation? */
2654 unsigned TrueLab; /* Jump to this label if true */
2658 TrueLab = GetLocalLabel ();
2660 /* Call the next level parser */
2661 hieAnd (Expr, TrueLab, &BoolOp);
2663 /* Any boolean or's? */
2664 if (CurTok.Tok == TOK_BOOL_OR) {
2666 /* If the expr hasn't set condition codes, set the force-test flag */
2667 if (!ED_IsTested (Expr)) {
2668 ED_MarkForTest (Expr);
2671 /* Get first expr */
2672 LoadExpr (CF_FORCECHAR, Expr);
2674 /* For each expression jump to TrueLab if true. Beware: If we
2675 * had && operators, the jump is already in place!
2678 g_truejump (CF_NONE, TrueLab);
2681 /* Remember that we had a boolean op */
2684 /* while there's more expr */
2685 while (CurTok.Tok == TOK_BOOL_OR) {
2692 hieAnd (&Expr2, TrueLab, &AndOp);
2693 if (!ED_IsTested (&Expr2)) {
2694 ED_MarkForTest (&Expr2);
2696 LoadExpr (CF_FORCECHAR, &Expr2);
2698 /* If there is more to come, add shortcut boolean eval. */
2699 g_truejump (CF_NONE, TrueLab);
2703 /* The result is an rvalue in primary */
2704 ED_MakeRValExpr (Expr);
2705 ED_TestDone (Expr); /* Condition codes are set */
2708 /* If we really had boolean ops, generate the end sequence */
2710 DoneLab = GetLocalLabel ();
2711 g_getimmed (CF_INT | CF_CONST, 0, 0); /* Load FALSE */
2712 g_falsejump (CF_NONE, DoneLab);
2713 g_defcodelabel (TrueLab);
2714 g_getimmed (CF_INT | CF_CONST, 1, 0); /* Load TRUE */
2715 g_defcodelabel (DoneLab);
2721 static void hieQuest (ExprDesc* Expr)
2722 /* Parse the ternary operator */
2726 CodeMark TrueCodeEnd;
2727 ExprDesc Expr2; /* Expression 2 */
2728 ExprDesc Expr3; /* Expression 3 */
2729 int Expr2IsNULL; /* Expression 2 is a NULL pointer */
2730 int Expr3IsNULL; /* Expression 3 is a NULL pointer */
2731 Type* ResultType; /* Type of result */
2734 /* Call the lower level eval routine */
2735 if (Preprocessing) {
2741 /* Check if it's a ternary expression */
2742 if (CurTok.Tok == TOK_QUEST) {
2744 if (!ED_IsTested (Expr)) {
2745 /* Condition codes not set, request a test */
2746 ED_MarkForTest (Expr);
2748 LoadExpr (CF_NONE, Expr);
2749 FalseLab = GetLocalLabel ();
2750 g_falsejump (CF_NONE, FalseLab);
2752 /* Parse second expression. Remember for later if it is a NULL pointer
2753 * expression, then load it into the primary.
2755 ExprWithCheck (hie1, &Expr2);
2756 Expr2IsNULL = ED_IsNullPtr (&Expr2);
2757 if (!IsTypeVoid (Expr2.Type)) {
2758 /* Load it into the primary */
2759 LoadExpr (CF_NONE, &Expr2);
2760 ED_MakeRValExpr (&Expr2);
2761 Expr2.Type = PtrConversion (Expr2.Type);
2764 /* Remember the current code position */
2765 GetCodePos (&TrueCodeEnd);
2767 /* Jump around the evaluation of the third expression */
2768 TrueLab = GetLocalLabel ();
2772 /* Jump here if the first expression was false */
2773 g_defcodelabel (FalseLab);
2775 /* Parse third expression. Remember for later if it is a NULL pointer
2776 * expression, then load it into the primary.
2778 ExprWithCheck (hie1, &Expr3);
2779 Expr3IsNULL = ED_IsNullPtr (&Expr3);
2780 if (!IsTypeVoid (Expr3.Type)) {
2781 /* Load it into the primary */
2782 LoadExpr (CF_NONE, &Expr3);
2783 ED_MakeRValExpr (&Expr3);
2784 Expr3.Type = PtrConversion (Expr3.Type);
2787 /* Check if any conversions are needed, if so, do them.
2788 * Conversion rules for ?: expression are:
2789 * - if both expressions are int expressions, default promotion
2790 * rules for ints apply.
2791 * - if both expressions are pointers of the same type, the
2792 * result of the expression is of this type.
2793 * - if one of the expressions is a pointer and the other is
2794 * a zero constant, the resulting type is that of the pointer
2796 * - if both expressions are void expressions, the result is of
2798 * - all other cases are flagged by an error.
2800 if (IsClassInt (Expr2.Type) && IsClassInt (Expr3.Type)) {
2802 CodeMark CvtCodeStart;
2803 CodeMark CvtCodeEnd;
2806 /* Get common type */
2807 ResultType = promoteint (Expr2.Type, Expr3.Type);
2809 /* Convert the third expression to this type if needed */
2810 TypeConversion (&Expr3, ResultType);
2812 /* Emit conversion code for the second expression, but remember
2813 * where it starts end ends.
2815 GetCodePos (&CvtCodeStart);
2816 TypeConversion (&Expr2, ResultType);
2817 GetCodePos (&CvtCodeEnd);
2819 /* If we had conversion code, move it to the right place */
2820 if (!CodeRangeIsEmpty (&CvtCodeStart, &CvtCodeEnd)) {
2821 MoveCode (&CvtCodeStart, &CvtCodeEnd, &TrueCodeEnd);
2824 } else if (IsClassPtr (Expr2.Type) && IsClassPtr (Expr3.Type)) {
2825 /* Must point to same type */
2826 if (TypeCmp (Indirect (Expr2.Type), Indirect (Expr3.Type)) < TC_EQUAL) {
2827 Error ("Incompatible pointer types");
2829 /* Result has the common type */
2830 ResultType = Expr2.Type;
2831 } else if (IsClassPtr (Expr2.Type) && Expr3IsNULL) {
2832 /* Result type is pointer, no cast needed */
2833 ResultType = Expr2.Type;
2834 } else if (Expr2IsNULL && IsClassPtr (Expr3.Type)) {
2835 /* Result type is pointer, no cast needed */
2836 ResultType = Expr3.Type;
2837 } else if (IsTypeVoid (Expr2.Type) && IsTypeVoid (Expr3.Type)) {
2838 /* Result type is void */
2839 ResultType = Expr3.Type;
2841 Error ("Incompatible types");
2842 ResultType = Expr2.Type; /* Doesn't matter here */
2845 /* Define the final label */
2846 g_defcodelabel (TrueLab);
2848 /* Setup the target expression */
2849 ED_MakeRValExpr (Expr);
2850 Expr->Type = ResultType;
2856 static void opeq (const GenDesc* Gen, ExprDesc* Expr, const char* Op)
2857 /* Process "op=" operators. */
2864 /* op= can only be used with lvalues */
2865 if (!ED_IsLVal (Expr)) {
2866 Error ("Invalid lvalue in assignment");
2870 /* The left side must not be const qualified */
2871 if (IsQualConst (Expr->Type)) {
2872 Error ("Assignment to const");
2875 /* There must be an integer or pointer on the left side */
2876 if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
2877 Error ("Invalid left operand type");
2878 /* Continue. Wrong code will be generated, but the compiler won't
2879 * break, so this is the best error recovery.
2883 /* Skip the operator token */
2886 /* Determine the type of the lhs */
2887 flags = TypeOf (Expr->Type);
2888 MustScale = (Gen->Func == g_add || Gen->Func == g_sub) && IsTypePtr (Expr->Type);
2890 /* Get the lhs address on stack (if needed) */
2893 /* Fetch the lhs into the primary register if needed */
2894 LoadExpr (CF_NONE, Expr);
2896 /* Bring the lhs on stack */
2900 /* Evaluate the rhs */
2901 MarkedExprWithCheck (hie1, &Expr2);
2903 /* The rhs must be an integer (or a float, but we don't support that yet */
2904 if (!IsClassInt (Expr2.Type)) {
2905 Error ("Invalid right operand for binary operator `%s'", Op);
2906 /* Continue. Wrong code will be generated, but the compiler won't
2907 * break, so this is the best error recovery.
2911 /* Check for a constant expression */
2912 if (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2)) {
2913 /* The resulting value is a constant. If the generator has the NOPUSH
2914 * flag set, don't push the lhs.
2916 if (Gen->Flags & GEN_NOPUSH) {
2920 /* lhs is a pointer, scale rhs */
2921 Expr2.IVal *= CheckedSizeOf (Expr->Type+1);
2924 /* If the lhs is character sized, the operation may be later done
2927 if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
2928 flags |= CF_FORCECHAR;
2931 /* Special handling for add and sub - some sort of a hack, but short code */
2932 if (Gen->Func == g_add) {
2933 g_inc (flags | CF_CONST, Expr2.IVal);
2934 } else if (Gen->Func == g_sub) {
2935 g_dec (flags | CF_CONST, Expr2.IVal);
2937 if (Expr2.IVal == 0) {
2938 /* Check for div by zero/mod by zero */
2939 if (Gen->Func == g_div) {
2940 Error ("Division by zero");
2941 } else if (Gen->Func == g_mod) {
2942 Error ("Modulo operation with zero");
2945 Gen->Func (flags | CF_CONST, Expr2.IVal);
2949 /* rhs is not constant. Load into the primary */
2950 LoadExpr (CF_NONE, &Expr2);
2952 /* lhs is a pointer, scale rhs */
2953 g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Expr->Type+1));
2956 /* If the lhs is character sized, the operation may be later done
2959 if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
2960 flags |= CF_FORCECHAR;
2963 /* Adjust the types of the operands if needed */
2964 Gen->Func (g_typeadjust (flags, TypeOf (Expr2.Type)), 0);
2967 ED_MakeRValExpr (Expr);
2972 static void addsubeq (const GenDesc* Gen, ExprDesc *Expr, const char* Op)
2973 /* Process the += and -= operators */
2981 /* We're currently only able to handle some adressing modes */
2982 if (ED_GetLoc (Expr) == E_LOC_EXPR || ED_GetLoc (Expr) == E_LOC_PRIMARY) {
2983 /* Use generic routine */
2984 opeq (Gen, Expr, Op);
2988 /* We must have an lvalue */
2989 if (ED_IsRVal (Expr)) {
2990 Error ("Invalid lvalue in assignment");
2994 /* The left side must not be const qualified */
2995 if (IsQualConst (Expr->Type)) {
2996 Error ("Assignment to const");
2999 /* There must be an integer or pointer on the left side */
3000 if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
3001 Error ("Invalid left operand type");
3002 /* Continue. Wrong code will be generated, but the compiler won't
3003 * break, so this is the best error recovery.
3007 /* Skip the operator */
3010 /* Check if we have a pointer expression and must scale rhs */
3011 MustScale = IsTypePtr (Expr->Type);
3013 /* Initialize the code generator flags */
3017 /* Evaluate the rhs. We expect an integer here, since float is not
3021 if (!IsClassInt (Expr2.Type)) {
3022 Error ("Invalid right operand for binary operator `%s'", Op);
3023 /* Continue. Wrong code will be generated, but the compiler won't
3024 * break, so this is the best error recovery.
3027 if (ED_IsConstAbs (&Expr2)) {
3028 /* The resulting value is a constant. Scale it. */
3030 Expr2.IVal *= CheckedSizeOf (Indirect (Expr->Type));
3035 /* Not constant, load into the primary */
3036 LoadExpr (CF_NONE, &Expr2);
3038 /* lhs is a pointer, scale rhs */
3039 g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Indirect (Expr->Type)));
3043 /* Setup the code generator flags */
3044 lflags |= TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR;
3045 rflags |= TypeOf (Expr2.Type) | CF_FORCECHAR;
3047 /* Convert the type of the lhs to that of the rhs */
3048 g_typecast (lflags, rflags);
3050 /* Output apropriate code depending on the location */
3051 switch (ED_GetLoc (Expr)) {
3054 /* Absolute: numeric address or const */
3055 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3056 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3058 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3063 /* Global variable */
3064 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3065 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3067 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3073 /* Static variable or literal in the literal pool */
3074 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3075 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3077 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3081 case E_LOC_REGISTER:
3082 /* Register variable */
3083 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3084 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3086 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3091 /* Value on the stack */
3092 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3093 g_addeqlocal (lflags, Expr->IVal, Expr2.IVal);
3095 g_subeqlocal (lflags, Expr->IVal, Expr2.IVal);
3100 Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
3103 /* Expression is a rvalue in the primary now */
3104 ED_MakeRValExpr (Expr);
3109 void hie1 (ExprDesc* Expr)
3110 /* Parse first level of expression hierarchy. */
3113 switch (CurTok.Tok) {
3119 case TOK_PLUS_ASSIGN:
3120 addsubeq (&GenPASGN, Expr, "+=");
3123 case TOK_MINUS_ASSIGN:
3124 addsubeq (&GenSASGN, Expr, "-=");
3127 case TOK_MUL_ASSIGN:
3128 opeq (&GenMASGN, Expr, "*=");
3131 case TOK_DIV_ASSIGN:
3132 opeq (&GenDASGN, Expr, "/=");
3135 case TOK_MOD_ASSIGN:
3136 opeq (&GenMOASGN, Expr, "%=");
3139 case TOK_SHL_ASSIGN:
3140 opeq (&GenSLASGN, Expr, "<<=");
3143 case TOK_SHR_ASSIGN:
3144 opeq (&GenSRASGN, Expr, ">>=");
3147 case TOK_AND_ASSIGN:
3148 opeq (&GenAASGN, Expr, "&=");
3151 case TOK_XOR_ASSIGN:
3152 opeq (&GenXOASGN, Expr, "^=");
3156 opeq (&GenOASGN, Expr, "|=");
3166 void hie0 (ExprDesc *Expr)
3167 /* Parse comma operator. */
3170 while (CurTok.Tok == TOK_COMMA) {
3178 int evalexpr (unsigned Flags, void (*Func) (ExprDesc*), ExprDesc* Expr)
3179 /* Will evaluate an expression via the given function. If the result is a
3180 * constant, 0 is returned and the value is put in the Expr struct. If the
3181 * result is not constant, LoadExpr is called to bring the value into the
3182 * primary register and 1 is returned.
3186 ExprWithCheck (Func, Expr);
3188 /* Check for a constant expression */
3189 if (ED_IsConstAbs (Expr)) {
3190 /* Constant expression */
3193 /* Not constant, load into the primary */
3194 LoadExpr (Flags, Expr);
3201 void Expression0 (ExprDesc* Expr)
3202 /* Evaluate an expression via hie0 and put the result into the primary register */
3204 ExprWithCheck (hie0, Expr);
3205 LoadExpr (CF_NONE, Expr);
3210 void ConstExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3211 /* Will evaluate an expression via the given function. If the result is not
3212 * a constant of some sort, a diagnostic will be printed, and the value is
3213 * replaced by a constant one to make sure there are no internal errors that
3214 * result from this input error.
3217 ExprWithCheck (Func, Expr);
3218 if (!ED_IsConst (Expr)) {
3219 Error ("Constant expression expected");
3220 /* To avoid any compiler errors, make the expression a valid const */
3221 ED_MakeConstAbsInt (Expr, 1);
3227 void BoolExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3228 /* Will evaluate an expression via the given function. If the result is not
3229 * something that may be evaluated in a boolean context, a diagnostic will be
3230 * printed, and the value is replaced by a constant one to make sure there
3231 * are no internal errors that result from this input error.
3234 ExprWithCheck (Func, Expr);
3235 if (!ED_IsBool (Expr)) {
3236 Error ("Boolean expression expected");
3237 /* To avoid any compiler errors, make the expression a valid int */
3238 ED_MakeConstAbsInt (Expr, 1);
3244 void ConstAbsIntExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3245 /* Will evaluate an expression via the given function. If the result is not
3246 * a constant numeric integer value, a diagnostic will be printed, and the
3247 * value is replaced by a constant one to make sure there are no internal
3248 * errors that result from this input error.
3251 ExprWithCheck (Func, Expr);
3252 if (!ED_IsConstAbsInt (Expr)) {
3253 Error ("Constant integer expression expected");
3254 /* To avoid any compiler errors, make the expression a valid const */
3255 ED_MakeConstAbsInt (Expr, 1);