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);
744 E->Type = GetCharArrayType (GetLiteralPoolOffs () - CurTok.IVal);
745 E->Flags = E_LOC_LITERAL | E_RTYPE_RVAL;
746 E->IVal = CurTok.IVal;
747 E->Name = LiteralPoolLabel;
754 E->Flags = E_LOC_EXPR | E_RTYPE_RVAL;
759 /* Register pseudo variable */
760 E->Type = type_uchar;
761 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
766 /* Register pseudo variable */
768 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
773 /* Register pseudo variable */
774 E->Type = type_ulong;
775 E->Flags = E_LOC_PRIMARY | E_RTYPE_LVAL;
780 /* Illegal primary. Be sure to skip the token to avoid endless
783 Error ("Expression expected");
785 ED_MakeConstAbsInt (E, 1);
792 static void ArrayRef (ExprDesc* Expr)
793 /* Handle an array reference. This function needs a rewrite. */
803 /* Skip the bracket */
806 /* Get the type of left side */
809 /* We can apply a special treatment for arrays that have a const base
810 * address. This is true for most arrays and will produce a lot better
811 * code. Check if this is a const base address.
813 ConstBaseAddr = ED_IsRVal (Expr) &&
814 (ED_IsLocConst (Expr) || ED_IsLocStack (Expr));
816 /* If we have a constant base, we delay the address fetch */
818 if (!ConstBaseAddr) {
819 /* Get a pointer to the array into the primary */
820 LoadExpr (CF_NONE, Expr);
822 /* Get the array pointer on stack. Do not push more than 16
823 * bit, even if this value is greater, since we cannot handle
824 * other than 16bit stuff when doing indexing.
830 /* TOS now contains ptr to array elements. Get the subscript. */
831 ExprWithCheck (hie0, &Subscript);
833 /* Check the types of array and subscript. We can either have a
834 * pointer/array to the left, in which case the subscript must be of an
835 * integer type, or we have an integer to the left, in which case the
836 * subscript must be a pointer/array.
837 * Since we do the necessary checking here, we can rely later on the
840 if (IsClassPtr (Expr->Type)) {
841 if (!IsClassInt (Subscript.Type)) {
842 Error ("Array subscript is not an integer");
843 /* To avoid any compiler errors, make the expression a valid int */
844 ED_MakeConstAbsInt (&Subscript, 0);
846 ElementType = Indirect (Expr->Type);
847 } else if (IsClassInt (Expr->Type)) {
848 if (!IsClassPtr (Subscript.Type)) {
849 Error ("Subscripted value is neither array nor pointer");
850 /* To avoid compiler errors, make the subscript a char[] at
853 ED_MakeConstAbs (&Subscript, 0, GetCharArrayType (1));
855 ElementType = Indirect (Subscript.Type);
857 Error ("Cannot subscript");
858 /* To avoid compiler errors, fake both the array and the subscript, so
859 * we can just proceed.
861 ED_MakeConstAbs (Expr, 0, GetCharArrayType (1));
862 ED_MakeConstAbsInt (&Subscript, 0);
863 ElementType = Indirect (Expr->Type);
866 /* If the subscript is a bit-field, load it and make it an rvalue */
867 if (ED_IsBitField (&Subscript)) {
868 LoadExpr (CF_NONE, &Subscript);
869 ED_MakeRValExpr (&Subscript);
872 /* Check if the subscript is constant absolute value */
873 if (ED_IsConstAbs (&Subscript)) {
875 /* The array subscript is a numeric constant. If we had pushed the
876 * array base address onto the stack before, we can remove this value,
877 * since we can generate expression+offset.
879 if (!ConstBaseAddr) {
882 /* Get an array pointer into the primary */
883 LoadExpr (CF_NONE, Expr);
886 if (IsClassPtr (Expr->Type)) {
888 /* Lhs is pointer/array. Scale the subscript value according to
891 Subscript.IVal *= CheckedSizeOf (ElementType);
893 /* Remove the address load code */
896 /* In case of an array, we can adjust the offset of the expression
897 * already in Expr. If the base address was a constant, we can even
898 * remove the code that loaded the address into the primary.
900 if (IsTypeArray (Expr->Type)) {
902 /* Adjust the offset */
903 Expr->IVal += Subscript.IVal;
907 /* It's a pointer, so we do have to load it into the primary
908 * first (if it's not already there).
910 if (ConstBaseAddr || ED_IsLVal (Expr)) {
911 LoadExpr (CF_NONE, Expr);
912 ED_MakeRValExpr (Expr);
916 Expr->IVal = Subscript.IVal;
921 /* Scale the rhs value according to the element type */
922 g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
924 /* Add the subscript. Since arrays are indexed by integers,
925 * we will ignore the true type of the subscript here and
926 * use always an int. #### Use offset but beware of LoadExpr!
928 g_inc (CF_INT | CF_CONST, Subscript.IVal);
934 /* Array subscript is not constant. Load it into the primary */
936 LoadExpr (CF_NONE, &Subscript);
939 if (IsClassPtr (Expr->Type)) {
941 /* Indexing is based on unsigneds, so we will just use the integer
942 * portion of the index (which is in (e)ax, so there's no further
945 g_scale (CF_INT, CheckedSizeOf (ElementType));
949 /* Get the int value on top. If we come here, we're sure, both
950 * values are 16 bit (the first one was truncated if necessary
951 * and the second one is a pointer). Note: If ConstBaseAddr is
952 * true, we don't have a value on stack, so to "swap" both, just
953 * push the subscript.
957 LoadExpr (CF_NONE, Expr);
964 g_scale (TypeOf (tptr1), CheckedSizeOf (ElementType));
968 /* The offset is now in the primary register. It we didn't have a
969 * constant base address for the lhs, the lhs address is already
970 * on stack, and we must add the offset. If the base address was
971 * constant, we call special functions to add the address to the
974 if (!ConstBaseAddr) {
976 /* The array base address is on stack and the subscript is in the
983 /* The subscript is in the primary, and the array base address is
984 * in Expr. If the subscript has itself a constant address, it is
985 * often a better idea to reverse again the order of the
986 * evaluation. This will generate better code if the subscript is
987 * a byte sized variable. But beware: This is only possible if the
988 * subscript was not scaled, that is, if this was a byte array
991 if ((ED_IsLocConst (&Subscript) || ED_IsLocStack (&Subscript)) &&
992 CheckedSizeOf (ElementType) == SIZEOF_CHAR) {
996 /* Reverse the order of evaluation */
997 if (CheckedSizeOf (Subscript.Type) == SIZEOF_CHAR) {
1002 RemoveCode (&Mark2);
1004 /* Get a pointer to the array into the primary. */
1005 LoadExpr (CF_NONE, Expr);
1007 /* Add the variable */
1008 if (ED_IsLocStack (&Subscript)) {
1009 g_addlocal (Flags, Subscript.IVal);
1011 Flags |= GlobalModeFlags (&Subscript);
1012 g_addstatic (Flags, Subscript.Name, Subscript.IVal);
1016 if (ED_IsLocAbs (Expr)) {
1017 /* Constant numeric address. Just add it */
1018 g_inc (CF_INT, Expr->IVal);
1019 } else if (ED_IsLocStack (Expr)) {
1020 /* Base address is a local variable address */
1021 if (IsTypeArray (Expr->Type)) {
1022 g_addaddr_local (CF_INT, Expr->IVal);
1024 g_addlocal (CF_PTR, Expr->IVal);
1027 /* Base address is a static variable address */
1028 unsigned Flags = CF_INT | GlobalModeFlags (Expr);
1029 if (ED_IsRVal (Expr)) {
1030 /* Add the address of the location */
1031 g_addaddr_static (Flags, Expr->Name, Expr->IVal);
1033 /* Add the contents of the location */
1034 g_addstatic (Flags, Expr->Name, Expr->IVal);
1042 /* The result is an expression in the primary */
1043 ED_MakeRValExpr (Expr);
1047 /* Result is of element type */
1048 Expr->Type = ElementType;
1050 /* An array element is actually a variable. So the rules for variables
1051 * with respect to the reference type apply: If it's an array, it is
1052 * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
1053 * but an array cannot contain functions).
1055 if (IsTypeArray (Expr->Type)) {
1061 /* Consume the closing bracket */
1067 static void StructRef (ExprDesc* Expr)
1068 /* Process struct field after . or ->. */
1073 /* Skip the token and check for an identifier */
1075 if (CurTok.Tok != TOK_IDENT) {
1076 Error ("Identifier expected");
1077 Expr->Type = type_int;
1081 /* Get the symbol table entry and check for a struct field */
1082 strcpy (Ident, CurTok.Ident);
1084 Field = FindStructField (Expr->Type, Ident);
1086 Error ("Struct/union has no field named `%s'", Ident);
1087 Expr->Type = type_int;
1091 /* If we have a struct pointer that is an lvalue and not already in the
1092 * primary, load it now.
1094 if (ED_IsLVal (Expr) && IsTypePtr (Expr->Type)) {
1096 /* Load into the primary */
1097 LoadExpr (CF_NONE, Expr);
1099 /* Make it an lvalue expression */
1100 ED_MakeLValExpr (Expr);
1103 /* Set the struct field offset */
1104 Expr->IVal += Field->V.Offs;
1106 /* The type is now the type of the field */
1107 Expr->Type = Field->Type;
1109 /* An struct member is actually a variable. So the rules for variables
1110 * with respect to the reference type apply: If it's an array, it is
1111 * a rvalue, otherwise it's an lvalue. (A function would also be a rvalue,
1112 * but a struct field cannot be a function).
1114 if (IsTypeArray (Expr->Type)) {
1120 /* Make the expression a bit field if necessary */
1121 if (SymIsBitField (Field)) {
1122 ED_MakeBitField (Expr, Field->V.B.BitOffs, Field->V.B.BitWidth);
1128 static void hie11 (ExprDesc *Expr)
1129 /* Handle compound types (structs and arrays) */
1131 /* Name value used in invalid function calls */
1132 static const char IllegalFunc[] = "illegal_function_call";
1134 /* Evaluate the lhs */
1137 /* Check for a rhs */
1138 while (CurTok.Tok == TOK_LBRACK || CurTok.Tok == TOK_LPAREN ||
1139 CurTok.Tok == TOK_DOT || CurTok.Tok == TOK_PTR_REF) {
1141 switch (CurTok.Tok) {
1144 /* Array reference */
1149 /* Function call. */
1150 if (!IsTypeFunc (Expr->Type) && !IsTypeFuncPtr (Expr->Type)) {
1151 /* Not a function */
1152 Error ("Illegal function call");
1153 /* Force the type to be a implicitly defined function, one
1154 * returning an int and taking any number of arguments.
1155 * Since we don't have a name, invent one.
1157 ED_MakeConstAbs (Expr, 0, GetImplicitFuncType ());
1158 Expr->Name = (long) IllegalFunc;
1160 /* Call the function */
1161 FunctionCall (Expr);
1165 if (!IsClassStruct (Expr->Type)) {
1166 Error ("Struct expected");
1172 /* If we have an array, convert it to pointer to first element */
1173 if (IsTypeArray (Expr->Type)) {
1174 Expr->Type = ArrayToPtr (Expr->Type);
1176 if (!IsClassPtr (Expr->Type) || !IsClassStruct (Indirect (Expr->Type))) {
1177 Error ("Struct pointer expected");
1183 Internal ("Invalid token in hie11: %d", CurTok.Tok);
1191 void Store (ExprDesc* Expr, const Type* StoreType)
1192 /* Store the primary register into the location denoted by Expr. If StoreType
1193 * is given, use this type when storing instead of Expr->Type. If StoreType
1194 * is NULL, use Expr->Type instead.
1199 /* If StoreType was not given, use Expr->Type instead */
1200 if (StoreType == 0) {
1201 StoreType = Expr->Type;
1204 /* Prepare the code generator flags */
1205 Flags = TypeOf (StoreType) | GlobalModeFlags (Expr);
1207 /* Do the store depending on the location */
1208 switch (ED_GetLoc (Expr)) {
1211 /* Absolute: numeric address or const */
1212 g_putstatic (Flags, Expr->IVal, 0);
1216 /* Global variable */
1217 g_putstatic (Flags, Expr->Name, Expr->IVal);
1222 /* Static variable or literal in the literal pool */
1223 g_putstatic (Flags, Expr->Name, Expr->IVal);
1226 case E_LOC_REGISTER:
1227 /* Register variable */
1228 g_putstatic (Flags, Expr->Name, Expr->IVal);
1232 /* Value on the stack */
1233 g_putlocal (Flags, Expr->IVal, 0);
1237 /* The primary register (value is already there) */
1241 /* An expression in the primary register */
1242 g_putind (Flags, Expr->IVal);
1246 Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
1249 /* Assume that each one of the stores will invalidate CC */
1250 ED_MarkAsUntested (Expr);
1255 static void PreInc (ExprDesc* Expr)
1256 /* Handle the preincrement operators */
1261 /* Skip the operator token */
1264 /* Evaluate the expression and check that it is an lvalue */
1266 if (!ED_IsLVal (Expr)) {
1267 Error ("Invalid lvalue");
1271 /* We cannot modify const values */
1272 if (IsQualConst (Expr->Type)) {
1273 Error ("Increment of read-only variable");
1276 /* Get the data type */
1277 Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
1279 /* Get the increment value in bytes */
1280 Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
1282 /* Check the location of the data */
1283 switch (ED_GetLoc (Expr)) {
1286 /* Absolute: numeric address or const */
1287 g_addeqstatic (Flags, Expr->IVal, 0, Val);
1291 /* Global variable */
1292 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1297 /* Static variable or literal in the literal pool */
1298 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1301 case E_LOC_REGISTER:
1302 /* Register variable */
1303 g_addeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1307 /* Value on the stack */
1308 g_addeqlocal (Flags, Expr->IVal, Val);
1312 /* The primary register */
1317 /* An expression in the primary register */
1318 g_addeqind (Flags, Expr->IVal, Val);
1322 Internal ("Invalid location in PreInc(): 0x%04X", ED_GetLoc (Expr));
1325 /* Result is an expression, no reference */
1326 ED_MakeRValExpr (Expr);
1331 static void PreDec (ExprDesc* Expr)
1332 /* Handle the predecrement operators */
1337 /* Skip the operator token */
1340 /* Evaluate the expression and check that it is an lvalue */
1342 if (!ED_IsLVal (Expr)) {
1343 Error ("Invalid lvalue");
1347 /* We cannot modify const values */
1348 if (IsQualConst (Expr->Type)) {
1349 Error ("Decrement of read-only variable");
1352 /* Get the data type */
1353 Flags = TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR | CF_CONST;
1355 /* Get the increment value in bytes */
1356 Val = IsTypePtr (Expr->Type)? CheckedPSizeOf (Expr->Type) : 1;
1358 /* Check the location of the data */
1359 switch (ED_GetLoc (Expr)) {
1362 /* Absolute: numeric address or const */
1363 g_subeqstatic (Flags, Expr->IVal, 0, Val);
1367 /* Global variable */
1368 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1373 /* Static variable or literal in the literal pool */
1374 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1377 case E_LOC_REGISTER:
1378 /* Register variable */
1379 g_subeqstatic (Flags, Expr->Name, Expr->IVal, Val);
1383 /* Value on the stack */
1384 g_subeqlocal (Flags, Expr->IVal, Val);
1388 /* The primary register */
1393 /* An expression in the primary register */
1394 g_subeqind (Flags, Expr->IVal, Val);
1398 Internal ("Invalid location in PreDec(): 0x%04X", ED_GetLoc (Expr));
1401 /* Result is an expression, no reference */
1402 ED_MakeRValExpr (Expr);
1407 static void PostInc (ExprDesc* Expr)
1408 /* Handle the postincrement operator */
1414 /* The expression to increment must be an lvalue */
1415 if (!ED_IsLVal (Expr)) {
1416 Error ("Invalid lvalue");
1420 /* We cannot modify const values */
1421 if (IsQualConst (Expr->Type)) {
1422 Error ("Increment of read-only variable");
1425 /* Get the data type */
1426 Flags = TypeOf (Expr->Type);
1428 /* Push the address if needed */
1431 /* Fetch the value and save it (since it's the result of the expression) */
1432 LoadExpr (CF_NONE, Expr);
1433 g_save (Flags | CF_FORCECHAR);
1435 /* If we have a pointer expression, increment by the size of the type */
1436 if (IsTypePtr (Expr->Type)) {
1437 g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
1439 g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
1442 /* Store the result back */
1445 /* Restore the original value in the primary register */
1446 g_restore (Flags | CF_FORCECHAR);
1448 /* The result is always an expression, no reference */
1449 ED_MakeRValExpr (Expr);
1454 static void PostDec (ExprDesc* Expr)
1455 /* Handle the postdecrement operator */
1461 /* The expression to increment must be an lvalue */
1462 if (!ED_IsLVal (Expr)) {
1463 Error ("Invalid lvalue");
1467 /* We cannot modify const values */
1468 if (IsQualConst (Expr->Type)) {
1469 Error ("Decrement of read-only variable");
1472 /* Get the data type */
1473 Flags = TypeOf (Expr->Type);
1475 /* Push the address if needed */
1478 /* Fetch the value and save it (since it's the result of the expression) */
1479 LoadExpr (CF_NONE, Expr);
1480 g_save (Flags | CF_FORCECHAR);
1482 /* If we have a pointer expression, increment by the size of the type */
1483 if (IsTypePtr (Expr->Type)) {
1484 g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
1486 g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
1489 /* Store the result back */
1492 /* Restore the original value in the primary register */
1493 g_restore (Flags | CF_FORCECHAR);
1495 /* The result is always an expression, no reference */
1496 ED_MakeRValExpr (Expr);
1501 static void UnaryOp (ExprDesc* Expr)
1502 /* Handle unary -/+ and ~ */
1506 /* Remember the operator token and skip it */
1507 token_t Tok = CurTok.Tok;
1510 /* Get the expression */
1513 /* We can only handle integer types */
1514 if (!IsClassInt (Expr->Type)) {
1515 Error ("Argument must have integer type");
1516 ED_MakeConstAbsInt (Expr, 1);
1519 /* Check for a constant expression */
1520 if (ED_IsConstAbs (Expr)) {
1521 /* Value is constant */
1523 case TOK_MINUS: Expr->IVal = -Expr->IVal; break;
1524 case TOK_PLUS: break;
1525 case TOK_COMP: Expr->IVal = ~Expr->IVal; break;
1526 default: Internal ("Unexpected token: %d", Tok);
1529 /* Value is not constant */
1530 LoadExpr (CF_NONE, Expr);
1532 /* Get the type of the expression */
1533 Flags = TypeOf (Expr->Type);
1535 /* Handle the operation */
1537 case TOK_MINUS: g_neg (Flags); break;
1538 case TOK_PLUS: break;
1539 case TOK_COMP: g_com (Flags); break;
1540 default: Internal ("Unexpected token: %d", Tok);
1543 /* The result is a rvalue in the primary */
1544 ED_MakeRValExpr (Expr);
1550 void hie10 (ExprDesc* Expr)
1551 /* Handle ++, --, !, unary - etc. */
1555 switch (CurTok.Tok) {
1573 if (evalexpr (CF_NONE, hie10, Expr) == 0) {
1574 /* Constant expression */
1575 Expr->IVal = !Expr->IVal;
1577 g_bneg (TypeOf (Expr->Type));
1578 ED_MakeRValExpr (Expr);
1579 ED_TestDone (Expr); /* bneg will set cc */
1585 ExprWithCheck (hie10, Expr);
1586 if (ED_IsLVal (Expr) || !(ED_IsLocConst (Expr) || ED_IsLocStack (Expr))) {
1587 /* Not a const, load it into the primary and make it a
1590 LoadExpr (CF_NONE, Expr);
1591 ED_MakeRValExpr (Expr);
1593 /* If the expression is already a pointer to function, the
1594 * additional dereferencing operator must be ignored.
1596 if (IsTypeFuncPtr (Expr->Type)) {
1597 /* Expression not storable */
1600 if (IsClassPtr (Expr->Type)) {
1601 Expr->Type = Indirect (Expr->Type);
1603 Error ("Illegal indirection");
1605 /* The * operator yields an lvalue */
1612 ExprWithCheck (hie10, Expr);
1613 /* The & operator may be applied to any lvalue, and it may be
1614 * applied to functions, even if they're no lvalues.
1616 if (ED_IsRVal (Expr) && !IsTypeFunc (Expr->Type) && !IsTypeArray (Expr->Type)) {
1617 Error ("Illegal address");
1619 if (ED_IsBitField (Expr)) {
1620 Error ("Cannot take address of bit-field");
1621 /* Do it anyway, just to avoid further warnings */
1622 Expr->Flags &= ~E_BITFIELD;
1624 Expr->Type = PointerTo (Expr->Type);
1625 /* The & operator yields an rvalue */
1632 if (TypeSpecAhead ()) {
1635 Size = CheckedSizeOf (ParseType (T));
1638 /* Remember the output queue pointer */
1642 Size = CheckedSizeOf (Expr->Type);
1643 /* Remove any generated code */
1646 ED_MakeConstAbs (Expr, Size, type_size_t);
1647 ED_MarkAsUntested (Expr);
1651 if (TypeSpecAhead ()) {
1661 /* Handle post increment */
1662 switch (CurTok.Tok) {
1663 case TOK_INC: PostInc (Expr); break;
1664 case TOK_DEC: PostDec (Expr); break;
1675 static void hie_internal (const GenDesc* Ops, /* List of generators */
1677 void (*hienext) (ExprDesc*),
1679 /* Helper function */
1685 token_t Tok; /* The operator token */
1686 unsigned ltype, type;
1687 int rconst; /* Operand is a constant */
1693 while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
1695 /* Tell the caller that we handled it's ops */
1698 /* All operators that call this function expect an int on the lhs */
1699 if (!IsClassInt (Expr->Type)) {
1700 Error ("Integer expression expected");
1701 /* To avoid further errors, make Expr a valid int expression */
1702 ED_MakeConstAbsInt (Expr, 1);
1705 /* Remember the operator token, then skip it */
1709 /* Get the lhs on stack */
1710 GetCodePos (&Mark1);
1711 ltype = TypeOf (Expr->Type);
1712 if (ED_IsConstAbs (Expr)) {
1713 /* Constant value */
1714 GetCodePos (&Mark2);
1715 g_push (ltype | CF_CONST, Expr->IVal);
1717 /* Value not constant */
1718 LoadExpr (CF_NONE, Expr);
1719 GetCodePos (&Mark2);
1723 /* Get the right hand side */
1724 MarkedExprWithCheck (hienext, &Expr2);
1726 /* Check for a constant expression */
1727 rconst = (ED_IsConstAbs (&Expr2) && ED_CodeRangeIsEmpty (&Expr2));
1729 /* Not constant, load into the primary */
1730 LoadExpr (CF_NONE, &Expr2);
1733 /* Check the type of the rhs */
1734 if (!IsClassInt (Expr2.Type)) {
1735 Error ("Integer expression expected");
1738 /* Check for const operands */
1739 if (ED_IsConstAbs (Expr) && rconst) {
1741 /* Both operands are constant, remove the generated code */
1742 RemoveCode (&Mark1);
1744 /* Get the type of the result */
1745 Expr->Type = promoteint (Expr->Type, Expr2.Type);
1747 /* Handle the op differently for signed and unsigned types */
1748 if (IsSignSigned (Expr->Type)) {
1750 /* Evaluate the result for signed operands */
1751 signed long Val1 = Expr->IVal;
1752 signed long Val2 = Expr2.IVal;
1755 Expr->IVal = (Val1 | Val2);
1758 Expr->IVal = (Val1 ^ Val2);
1761 Expr->IVal = (Val1 & Val2);
1764 Expr->IVal = (Val1 * Val2);
1768 Error ("Division by zero");
1769 Expr->IVal = 0x7FFFFFFF;
1771 Expr->IVal = (Val1 / Val2);
1776 Error ("Modulo operation with zero");
1779 Expr->IVal = (Val1 % Val2);
1783 Internal ("hie_internal: got token 0x%X\n", Tok);
1787 /* Evaluate the result for unsigned operands */
1788 unsigned long Val1 = Expr->IVal;
1789 unsigned long Val2 = Expr2.IVal;
1792 Expr->IVal = (Val1 | Val2);
1795 Expr->IVal = (Val1 ^ Val2);
1798 Expr->IVal = (Val1 & Val2);
1801 Expr->IVal = (Val1 * Val2);
1805 Error ("Division by zero");
1806 Expr->IVal = 0xFFFFFFFF;
1808 Expr->IVal = (Val1 / Val2);
1813 Error ("Modulo operation with zero");
1816 Expr->IVal = (Val1 % Val2);
1820 Internal ("hie_internal: got token 0x%X\n", Tok);
1826 /* If the right hand side is constant, and the generator function
1827 * expects the lhs in the primary, remove the push of the primary
1830 unsigned rtype = TypeOf (Expr2.Type);
1833 /* Second value is constant - check for div */
1836 if (Tok == TOK_DIV && Expr2.IVal == 0) {
1837 Error ("Division by zero");
1838 } else if (Tok == TOK_MOD && Expr2.IVal == 0) {
1839 Error ("Modulo operation with zero");
1841 if ((Gen->Flags & GEN_NOPUSH) != 0) {
1842 RemoveCode (&Mark2);
1843 ltype |= CF_REG; /* Value is in register */
1847 /* Determine the type of the operation result. */
1848 type |= g_typeadjust (ltype, rtype);
1849 Expr->Type = promoteint (Expr->Type, Expr2.Type);
1852 Gen->Func (type, Expr2.IVal);
1854 /* We have a rvalue in the primary now */
1855 ED_MakeRValExpr (Expr);
1862 static void hie_compare (const GenDesc* Ops, /* List of generators */
1864 void (*hienext) (ExprDesc*))
1865 /* Helper function for the compare operators */
1871 token_t Tok; /* The operator token */
1873 int rconst; /* Operand is a constant */
1878 while ((Gen = FindGen (CurTok.Tok, Ops)) != 0) {
1880 /* Remember the operator token, then skip it */
1884 /* Get the lhs on stack */
1885 GetCodePos (&Mark1);
1886 ltype = TypeOf (Expr->Type);
1887 if (ED_IsConstAbs (Expr)) {
1888 /* Constant value */
1889 GetCodePos (&Mark2);
1890 g_push (ltype | CF_CONST, Expr->IVal);
1892 /* Value not constant */
1893 LoadExpr (CF_NONE, Expr);
1894 GetCodePos (&Mark2);
1898 /* Get the right hand side */
1899 rconst = (evalexpr (CF_NONE, hienext, &Expr2) == 0);
1901 /* Make sure, the types are compatible */
1902 if (IsClassInt (Expr->Type)) {
1903 if (!IsClassInt (Expr2.Type) && !(IsClassPtr(Expr2.Type) && ED_IsNullPtr(Expr))) {
1904 Error ("Incompatible types");
1906 } else if (IsClassPtr (Expr->Type)) {
1907 if (IsClassPtr (Expr2.Type)) {
1908 /* Both pointers are allowed in comparison if they point to
1909 * the same type, or if one of them is a void pointer.
1911 Type* left = Indirect (Expr->Type);
1912 Type* right = Indirect (Expr2.Type);
1913 if (TypeCmp (left, right) < TC_EQUAL && left->C != T_VOID && right->C != T_VOID) {
1914 /* Incomatible pointers */
1915 Error ("Incompatible types");
1917 } else if (!ED_IsNullPtr (&Expr2)) {
1918 Error ("Incompatible types");
1922 /* Check for const operands */
1923 if (ED_IsConstAbs (Expr) && rconst) {
1925 /* If the result is constant, this is suspicious when not in
1926 * preprocessor mode.
1928 if (!Preprocessing) {
1929 Warning ("Result of comparison is constant");
1932 /* Both operands are constant, remove the generated code */
1933 RemoveCode (&Mark1);
1935 /* Determine if this is a signed or unsigned compare */
1936 if (IsClassInt (Expr->Type) && IsSignSigned (Expr->Type) &&
1937 IsClassInt (Expr2.Type) && IsSignSigned (Expr2.Type)) {
1939 /* Evaluate the result for signed operands */
1940 signed long Val1 = Expr->IVal;
1941 signed long Val2 = Expr2.IVal;
1943 case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
1944 case TOK_NE: Expr->IVal = (Val1 != Val2); break;
1945 case TOK_LT: Expr->IVal = (Val1 < Val2); break;
1946 case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
1947 case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
1948 case TOK_GT: Expr->IVal = (Val1 > Val2); break;
1949 default: Internal ("hie_compare: got token 0x%X\n", Tok);
1954 /* Evaluate the result for unsigned operands */
1955 unsigned long Val1 = Expr->IVal;
1956 unsigned long Val2 = Expr2.IVal;
1958 case TOK_EQ: Expr->IVal = (Val1 == Val2); break;
1959 case TOK_NE: Expr->IVal = (Val1 != Val2); break;
1960 case TOK_LT: Expr->IVal = (Val1 < Val2); break;
1961 case TOK_LE: Expr->IVal = (Val1 <= Val2); break;
1962 case TOK_GE: Expr->IVal = (Val1 >= Val2); break;
1963 case TOK_GT: Expr->IVal = (Val1 > Val2); break;
1964 default: Internal ("hie_compare: got token 0x%X\n", Tok);
1970 /* If the right hand side is constant, and the generator function
1971 * expects the lhs in the primary, remove the push of the primary
1977 if ((Gen->Flags & GEN_NOPUSH) != 0) {
1978 RemoveCode (&Mark2);
1979 ltype |= CF_REG; /* Value is in register */
1983 /* Determine the type of the operation result. If the left
1984 * operand is of type char and the right is a constant, or
1985 * if both operands are of type char, we will encode the
1986 * operation as char operation. Otherwise the default
1987 * promotions are used.
1989 if (IsTypeChar (Expr->Type) && (IsTypeChar (Expr2.Type) || rconst)) {
1991 if (IsSignUnsigned (Expr->Type) || IsSignUnsigned (Expr2.Type)) {
1992 flags |= CF_UNSIGNED;
1995 flags |= CF_FORCECHAR;
1998 unsigned rtype = TypeOf (Expr2.Type) | (flags & CF_CONST);
1999 flags |= g_typeadjust (ltype, rtype);
2003 Gen->Func (flags, Expr2.IVal);
2005 /* The result is an rvalue in the primary */
2006 ED_MakeRValExpr (Expr);
2009 /* Result type is always int */
2010 Expr->Type = type_int;
2012 /* Condition codes are set */
2019 static void hie9 (ExprDesc *Expr)
2020 /* Process * and / operators. */
2022 static const GenDesc hie9_ops[] = {
2023 { TOK_STAR, GEN_NOPUSH, g_mul },
2024 { TOK_DIV, GEN_NOPUSH, g_div },
2025 { TOK_MOD, GEN_NOPUSH, g_mod },
2026 { TOK_INVALID, 0, 0 }
2030 hie_internal (hie9_ops, Expr, hie10, &UsedGen);
2035 static void parseadd (ExprDesc* Expr)
2036 /* Parse an expression with the binary plus operator. Expr contains the
2037 * unprocessed left hand side of the expression and will contain the
2038 * result of the expression on return.
2042 unsigned flags; /* Operation flags */
2043 CodeMark Mark; /* Remember code position */
2044 Type* lhst; /* Type of left hand side */
2045 Type* rhst; /* Type of right hand side */
2048 /* Skip the PLUS token */
2051 /* Get the left hand side type, initialize operation flags */
2055 /* Check for constness on both sides */
2056 if (ED_IsConst (Expr)) {
2058 /* The left hand side is a constant of some sort. Good. Get rhs */
2060 if (ED_IsConstAbs (&Expr2)) {
2062 /* Right hand side is a constant numeric value. Get the rhs type */
2065 /* Both expressions are constants. Check for pointer arithmetic */
2066 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2067 /* Left is pointer, right is int, must scale rhs */
2068 Expr->IVal += Expr2.IVal * CheckedPSizeOf (lhst);
2069 /* Result type is a pointer */
2070 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2071 /* Left is int, right is pointer, must scale lhs */
2072 Expr->IVal = Expr->IVal * CheckedPSizeOf (rhst) + Expr2.IVal;
2073 /* Result type is a pointer */
2074 Expr->Type = Expr2.Type;
2075 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2076 /* Integer addition */
2077 Expr->IVal += Expr2.IVal;
2078 typeadjust (Expr, &Expr2, 1);
2081 Error ("Invalid operands for binary operator `+'");
2086 /* lhs is a constant and rhs is not constant. Load rhs into
2089 LoadExpr (CF_NONE, &Expr2);
2091 /* Beware: The check above (for lhs) lets not only pass numeric
2092 * constants, but also constant addresses (labels), maybe even
2093 * with an offset. We have to check for that here.
2096 /* First, get the rhs type. */
2100 if (ED_IsLocAbs (Expr)) {
2101 /* A numerical constant */
2104 /* Constant address label */
2105 flags |= GlobalModeFlags (Expr) | CF_CONSTADDR;
2108 /* Check for pointer arithmetic */
2109 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2110 /* Left is pointer, right is int, must scale rhs */
2111 g_scale (CF_INT, CheckedPSizeOf (lhst));
2112 /* Operate on pointers, result type is a pointer */
2114 /* Generate the code for the add */
2115 if (ED_GetLoc (Expr) == E_LOC_ABS) {
2116 /* Numeric constant */
2117 g_inc (flags, Expr->IVal);
2119 /* Constant address */
2120 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2122 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2124 /* Left is int, right is pointer, must scale lhs. */
2125 unsigned ScaleFactor = CheckedPSizeOf (rhst);
2127 /* Operate on pointers, result type is a pointer */
2129 Expr->Type = Expr2.Type;
2131 /* Since we do already have rhs in the primary, if lhs is
2132 * not a numeric constant, and the scale factor is not one
2133 * (no scaling), we must take the long way over the stack.
2135 if (ED_IsLocAbs (Expr)) {
2136 /* Numeric constant, scale lhs */
2137 Expr->IVal *= ScaleFactor;
2138 /* Generate the code for the add */
2139 g_inc (flags, Expr->IVal);
2140 } else if (ScaleFactor == 1) {
2141 /* Constant address but no need to scale */
2142 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2144 /* Constant address that must be scaled */
2145 g_push (TypeOf (Expr2.Type), 0); /* rhs --> stack */
2146 g_getimmed (flags, Expr->Name, Expr->IVal);
2147 g_scale (CF_PTR, ScaleFactor);
2150 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2151 /* Integer addition */
2152 flags |= typeadjust (Expr, &Expr2, 1);
2153 /* Generate the code for the add */
2154 if (ED_IsLocAbs (Expr)) {
2155 /* Numeric constant */
2156 g_inc (flags, Expr->IVal);
2158 /* Constant address */
2159 g_addaddr_static (flags, Expr->Name, Expr->IVal);
2163 Error ("Invalid operands for binary operator `+'");
2167 /* Result is a rvalue in primary register */
2168 ED_MakeRValExpr (Expr);
2173 /* Left hand side is not constant. Get the value onto the stack. */
2174 LoadExpr (CF_NONE, Expr); /* --> primary register */
2176 g_push (TypeOf (Expr->Type), 0); /* --> stack */
2178 /* Evaluate the rhs */
2179 if (evalexpr (CF_NONE, hie9, &Expr2) == 0) {
2181 /* Right hand side is a constant. Get the rhs type */
2184 /* Remove pushed value from stack */
2187 /* Check for pointer arithmetic */
2188 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2189 /* Left is pointer, right is int, must scale rhs */
2190 Expr2.IVal *= CheckedPSizeOf (lhst);
2191 /* Operate on pointers, result type is a pointer */
2193 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2194 /* Left is int, right is pointer, must scale lhs (ptr only) */
2195 g_scale (CF_INT | CF_CONST, CheckedPSizeOf (rhst));
2196 /* Operate on pointers, result type is a pointer */
2198 Expr->Type = Expr2.Type;
2199 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2200 /* Integer addition */
2201 flags = typeadjust (Expr, &Expr2, 1);
2204 Error ("Invalid operands for binary operator `+'");
2208 /* Generate code for the add */
2209 g_inc (flags | CF_CONST, Expr2.IVal);
2213 /* lhs and rhs are not constant. Get the rhs type. */
2216 /* Check for pointer arithmetic */
2217 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2218 /* Left is pointer, right is int, must scale rhs */
2219 g_scale (CF_INT, CheckedPSizeOf (lhst));
2220 /* Operate on pointers, result type is a pointer */
2222 } else if (IsClassInt (lhst) && IsClassPtr (rhst)) {
2223 /* Left is int, right is pointer, must scale lhs */
2224 g_tosint (TypeOf (rhst)); /* Make sure, TOS is int */
2225 g_swap (CF_INT); /* Swap TOS and primary */
2226 g_scale (CF_INT, CheckedPSizeOf (rhst));
2227 /* Operate on pointers, result type is a pointer */
2229 Expr->Type = Expr2.Type;
2230 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2231 /* Integer addition. Note: Result is never constant.
2232 * Problem here is that typeadjust does not know if the
2233 * variable is an rvalue or lvalue, so if both operands
2234 * are dereferenced constant numeric addresses, typeadjust
2235 * thinks the operation works on constants. Removing
2236 * CF_CONST here means handling the symptoms, however, the
2237 * whole parser is such a mess that I fear to break anything
2238 * when trying to apply another solution.
2240 flags = typeadjust (Expr, &Expr2, 0) & ~CF_CONST;
2243 Error ("Invalid operands for binary operator `+'");
2247 /* Generate code for the add */
2252 /* Result is a rvalue in primary register */
2253 ED_MakeRValExpr (Expr);
2256 /* Condition codes not set */
2257 ED_MarkAsUntested (Expr);
2263 static void parsesub (ExprDesc* Expr)
2264 /* Parse an expression with the binary minus operator. Expr contains the
2265 * unprocessed left hand side of the expression and will contain the
2266 * result of the expression on return.
2270 unsigned flags; /* Operation flags */
2271 Type* lhst; /* Type of left hand side */
2272 Type* rhst; /* Type of right hand side */
2273 CodeMark Mark1; /* Save position of output queue */
2274 CodeMark Mark2; /* Another position in the queue */
2275 int rscale; /* Scale factor for the result */
2278 /* Skip the MINUS token */
2281 /* Get the left hand side type, initialize operation flags */
2283 rscale = 1; /* Scale by 1, that is, don't scale */
2285 /* Remember the output queue position, then bring the value onto the stack */
2286 GetCodePos (&Mark1);
2287 LoadExpr (CF_NONE, Expr); /* --> primary register */
2288 GetCodePos (&Mark2);
2289 g_push (TypeOf (lhst), 0); /* --> stack */
2291 /* Parse the right hand side */
2292 if (evalexpr (CF_NONE, hie9, &Expr2) == 0) {
2294 /* The right hand side is constant. Get the rhs type. */
2297 /* Check left hand side */
2298 if (ED_IsConstAbs (Expr)) {
2300 /* Both sides are constant, remove generated code */
2301 RemoveCode (&Mark1);
2303 /* Check for pointer arithmetic */
2304 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2305 /* Left is pointer, right is int, must scale rhs */
2306 Expr->IVal -= Expr2.IVal * CheckedPSizeOf (lhst);
2307 /* Operate on pointers, result type is a pointer */
2308 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2309 /* Left is pointer, right is pointer, must scale result */
2310 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2311 Error ("Incompatible pointer types");
2313 Expr->IVal = (Expr->IVal - Expr2.IVal) /
2314 CheckedPSizeOf (lhst);
2316 /* Operate on pointers, result type is an integer */
2317 Expr->Type = type_int;
2318 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2319 /* Integer subtraction */
2320 typeadjust (Expr, &Expr2, 1);
2321 Expr->IVal -= Expr2.IVal;
2324 Error ("Invalid operands for binary operator `-'");
2327 /* Result is constant, condition codes not set */
2328 ED_MarkAsUntested (Expr);
2332 /* Left hand side is not constant, right hand side is.
2333 * Remove pushed value from stack.
2335 RemoveCode (&Mark2);
2337 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2338 /* Left is pointer, right is int, must scale rhs */
2339 Expr2.IVal *= CheckedPSizeOf (lhst);
2340 /* Operate on pointers, result type is a pointer */
2342 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2343 /* Left is pointer, right is pointer, must scale result */
2344 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2345 Error ("Incompatible pointer types");
2347 rscale = CheckedPSizeOf (lhst);
2349 /* Operate on pointers, result type is an integer */
2351 Expr->Type = type_int;
2352 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2353 /* Integer subtraction */
2354 flags = typeadjust (Expr, &Expr2, 1);
2357 Error ("Invalid operands for binary operator `-'");
2361 /* Do the subtraction */
2362 g_dec (flags | CF_CONST, Expr2.IVal);
2364 /* If this was a pointer subtraction, we must scale the result */
2366 g_scale (flags, -rscale);
2369 /* Result is a rvalue in the primary register */
2370 ED_MakeRValExpr (Expr);
2371 ED_MarkAsUntested (Expr);
2377 /* Right hand side is not constant. Get the rhs type. */
2380 /* Check for pointer arithmetic */
2381 if (IsClassPtr (lhst) && IsClassInt (rhst)) {
2382 /* Left is pointer, right is int, must scale rhs */
2383 g_scale (CF_INT, CheckedPSizeOf (lhst));
2384 /* Operate on pointers, result type is a pointer */
2386 } else if (IsClassPtr (lhst) && IsClassPtr (rhst)) {
2387 /* Left is pointer, right is pointer, must scale result */
2388 if (TypeCmp (Indirect (lhst), Indirect (rhst)) < TC_QUAL_DIFF) {
2389 Error ("Incompatible pointer types");
2391 rscale = CheckedPSizeOf (lhst);
2393 /* Operate on pointers, result type is an integer */
2395 Expr->Type = type_int;
2396 } else if (IsClassInt (lhst) && IsClassInt (rhst)) {
2397 /* Integer subtraction. If the left hand side descriptor says that
2398 * the lhs is const, we have to remove this mark, since this is no
2399 * longer true, lhs is on stack instead.
2401 if (ED_IsLocAbs (Expr)) {
2402 ED_MakeRValExpr (Expr);
2404 /* Adjust operand types */
2405 flags = typeadjust (Expr, &Expr2, 0);
2408 Error ("Invalid operands for binary operator `-'");
2412 /* Generate code for the sub (the & is a hack here) */
2413 g_sub (flags & ~CF_CONST, 0);
2415 /* If this was a pointer subtraction, we must scale the result */
2417 g_scale (flags, -rscale);
2420 /* Result is a rvalue in the primary register */
2421 ED_MakeRValExpr (Expr);
2422 ED_MarkAsUntested (Expr);
2428 void hie8 (ExprDesc* Expr)
2429 /* Process + and - binary operators. */
2432 while (CurTok.Tok == TOK_PLUS || CurTok.Tok == TOK_MINUS) {
2433 if (CurTok.Tok == TOK_PLUS) {
2443 static void hie6 (ExprDesc* Expr)
2444 /* Handle greater-than type comparators */
2446 static const GenDesc hie6_ops [] = {
2447 { TOK_LT, GEN_NOPUSH, g_lt },
2448 { TOK_LE, GEN_NOPUSH, g_le },
2449 { TOK_GE, GEN_NOPUSH, g_ge },
2450 { TOK_GT, GEN_NOPUSH, g_gt },
2451 { TOK_INVALID, 0, 0 }
2453 hie_compare (hie6_ops, Expr, ShiftExpr);
2458 static void hie5 (ExprDesc* Expr)
2459 /* Handle == and != */
2461 static const GenDesc hie5_ops[] = {
2462 { TOK_EQ, GEN_NOPUSH, g_eq },
2463 { TOK_NE, GEN_NOPUSH, g_ne },
2464 { TOK_INVALID, 0, 0 }
2466 hie_compare (hie5_ops, Expr, hie6);
2471 static void hie4 (ExprDesc* Expr)
2472 /* Handle & (bitwise and) */
2474 static const GenDesc hie4_ops[] = {
2475 { TOK_AND, GEN_NOPUSH, g_and },
2476 { TOK_INVALID, 0, 0 }
2480 hie_internal (hie4_ops, Expr, hie5, &UsedGen);
2485 static void hie3 (ExprDesc* Expr)
2486 /* Handle ^ (bitwise exclusive or) */
2488 static const GenDesc hie3_ops[] = {
2489 { TOK_XOR, GEN_NOPUSH, g_xor },
2490 { TOK_INVALID, 0, 0 }
2494 hie_internal (hie3_ops, Expr, hie4, &UsedGen);
2499 static void hie2 (ExprDesc* Expr)
2500 /* Handle | (bitwise or) */
2502 static const GenDesc hie2_ops[] = {
2503 { TOK_OR, GEN_NOPUSH, g_or },
2504 { TOK_INVALID, 0, 0 }
2508 hie_internal (hie2_ops, Expr, hie3, &UsedGen);
2513 static void hieAndPP (ExprDesc* Expr)
2514 /* Process "exp && exp" in preprocessor mode (that is, when the parser is
2515 * called recursively from the preprocessor.
2520 ConstAbsIntExpr (hie2, Expr);
2521 while (CurTok.Tok == TOK_BOOL_AND) {
2527 ConstAbsIntExpr (hie2, &Expr2);
2529 /* Combine the two */
2530 Expr->IVal = (Expr->IVal && Expr2.IVal);
2536 static void hieOrPP (ExprDesc *Expr)
2537 /* Process "exp || exp" in preprocessor mode (that is, when the parser is
2538 * called recursively from the preprocessor.
2543 ConstAbsIntExpr (hieAndPP, Expr);
2544 while (CurTok.Tok == TOK_BOOL_OR) {
2550 ConstAbsIntExpr (hieAndPP, &Expr2);
2552 /* Combine the two */
2553 Expr->IVal = (Expr->IVal || Expr2.IVal);
2559 static void hieAnd (ExprDesc* Expr, unsigned TrueLab, int* BoolOp)
2560 /* Process "exp && exp" */
2566 if (CurTok.Tok == TOK_BOOL_AND) {
2568 /* Tell our caller that we're evaluating a boolean */
2571 /* Get a label that we will use for false expressions */
2572 FalseLab = GetLocalLabel ();
2574 /* If the expr hasn't set condition codes, set the force-test flag */
2575 if (!ED_IsTested (Expr)) {
2576 ED_MarkForTest (Expr);
2579 /* Load the value */
2580 LoadExpr (CF_FORCECHAR, Expr);
2582 /* Generate the jump */
2583 g_falsejump (CF_NONE, FalseLab);
2585 /* Parse more boolean and's */
2586 while (CurTok.Tok == TOK_BOOL_AND) {
2593 if (!ED_IsTested (&Expr2)) {
2594 ED_MarkForTest (&Expr2);
2596 LoadExpr (CF_FORCECHAR, &Expr2);
2598 /* Do short circuit evaluation */
2599 if (CurTok.Tok == TOK_BOOL_AND) {
2600 g_falsejump (CF_NONE, FalseLab);
2602 /* Last expression - will evaluate to true */
2603 g_truejump (CF_NONE, TrueLab);
2607 /* Define the false jump label here */
2608 g_defcodelabel (FalseLab);
2610 /* The result is an rvalue in primary */
2611 ED_MakeRValExpr (Expr);
2612 ED_TestDone (Expr); /* Condition codes are set */
2618 static void hieOr (ExprDesc *Expr)
2619 /* Process "exp || exp". */
2622 int BoolOp = 0; /* Did we have a boolean op? */
2623 int AndOp; /* Did we have a && operation? */
2624 unsigned TrueLab; /* Jump to this label if true */
2628 TrueLab = GetLocalLabel ();
2630 /* Call the next level parser */
2631 hieAnd (Expr, TrueLab, &BoolOp);
2633 /* Any boolean or's? */
2634 if (CurTok.Tok == TOK_BOOL_OR) {
2636 /* If the expr hasn't set condition codes, set the force-test flag */
2637 if (!ED_IsTested (Expr)) {
2638 ED_MarkForTest (Expr);
2641 /* Get first expr */
2642 LoadExpr (CF_FORCECHAR, Expr);
2644 /* For each expression jump to TrueLab if true. Beware: If we
2645 * had && operators, the jump is already in place!
2648 g_truejump (CF_NONE, TrueLab);
2651 /* Remember that we had a boolean op */
2654 /* while there's more expr */
2655 while (CurTok.Tok == TOK_BOOL_OR) {
2662 hieAnd (&Expr2, TrueLab, &AndOp);
2663 if (!ED_IsTested (&Expr2)) {
2664 ED_MarkForTest (&Expr2);
2666 LoadExpr (CF_FORCECHAR, &Expr2);
2668 /* If there is more to come, add shortcut boolean eval. */
2669 g_truejump (CF_NONE, TrueLab);
2673 /* The result is an rvalue in primary */
2674 ED_MakeRValExpr (Expr);
2675 ED_TestDone (Expr); /* Condition codes are set */
2678 /* If we really had boolean ops, generate the end sequence */
2680 DoneLab = GetLocalLabel ();
2681 g_getimmed (CF_INT | CF_CONST, 0, 0); /* Load FALSE */
2682 g_falsejump (CF_NONE, DoneLab);
2683 g_defcodelabel (TrueLab);
2684 g_getimmed (CF_INT | CF_CONST, 1, 0); /* Load TRUE */
2685 g_defcodelabel (DoneLab);
2691 static void hieQuest (ExprDesc* Expr)
2692 /* Parse the ternary operator */
2696 CodeMark TrueCodeEnd;
2697 ExprDesc Expr2; /* Expression 2 */
2698 ExprDesc Expr3; /* Expression 3 */
2699 int Expr2IsNULL; /* Expression 2 is a NULL pointer */
2700 int Expr3IsNULL; /* Expression 3 is a NULL pointer */
2701 Type* ResultType; /* Type of result */
2704 /* Call the lower level eval routine */
2705 if (Preprocessing) {
2711 /* Check if it's a ternary expression */
2712 if (CurTok.Tok == TOK_QUEST) {
2714 if (!ED_IsTested (Expr)) {
2715 /* Condition codes not set, request a test */
2716 ED_MarkForTest (Expr);
2718 LoadExpr (CF_NONE, Expr);
2719 FalseLab = GetLocalLabel ();
2720 g_falsejump (CF_NONE, FalseLab);
2722 /* Parse second expression. Remember for later if it is a NULL pointer
2723 * expression, then load it into the primary.
2725 ExprWithCheck (hie1, &Expr2);
2726 Expr2IsNULL = ED_IsNullPtr (&Expr2);
2727 if (!IsTypeVoid (Expr2.Type)) {
2728 /* Load it into the primary */
2729 LoadExpr (CF_NONE, &Expr2);
2730 ED_MakeRValExpr (&Expr2);
2731 Expr2.Type = PtrConversion (Expr2.Type);
2734 /* Remember the current code position */
2735 GetCodePos (&TrueCodeEnd);
2737 /* Jump around the evaluation of the third expression */
2738 TrueLab = GetLocalLabel ();
2742 /* Jump here if the first expression was false */
2743 g_defcodelabel (FalseLab);
2745 /* Parse third expression. Remember for later if it is a NULL pointer
2746 * expression, then load it into the primary.
2748 ExprWithCheck (hie1, &Expr3);
2749 Expr3IsNULL = ED_IsNullPtr (&Expr3);
2750 if (!IsTypeVoid (Expr3.Type)) {
2751 /* Load it into the primary */
2752 LoadExpr (CF_NONE, &Expr3);
2753 ED_MakeRValExpr (&Expr3);
2754 Expr3.Type = PtrConversion (Expr3.Type);
2757 /* Check if any conversions are needed, if so, do them.
2758 * Conversion rules for ?: expression are:
2759 * - if both expressions are int expressions, default promotion
2760 * rules for ints apply.
2761 * - if both expressions are pointers of the same type, the
2762 * result of the expression is of this type.
2763 * - if one of the expressions is a pointer and the other is
2764 * a zero constant, the resulting type is that of the pointer
2766 * - if both expressions are void expressions, the result is of
2768 * - all other cases are flagged by an error.
2770 if (IsClassInt (Expr2.Type) && IsClassInt (Expr3.Type)) {
2772 CodeMark CvtCodeStart;
2773 CodeMark CvtCodeEnd;
2776 /* Get common type */
2777 ResultType = promoteint (Expr2.Type, Expr3.Type);
2779 /* Convert the third expression to this type if needed */
2780 TypeConversion (&Expr3, ResultType);
2782 /* Emit conversion code for the second expression, but remember
2783 * where it starts end ends.
2785 GetCodePos (&CvtCodeStart);
2786 TypeConversion (&Expr2, ResultType);
2787 GetCodePos (&CvtCodeEnd);
2789 /* If we had conversion code, move it to the right place */
2790 if (!CodeRangeIsEmpty (&CvtCodeStart, &CvtCodeEnd)) {
2791 MoveCode (&CvtCodeStart, &CvtCodeEnd, &TrueCodeEnd);
2794 } else if (IsClassPtr (Expr2.Type) && IsClassPtr (Expr3.Type)) {
2795 /* Must point to same type */
2796 if (TypeCmp (Indirect (Expr2.Type), Indirect (Expr3.Type)) < TC_EQUAL) {
2797 Error ("Incompatible pointer types");
2799 /* Result has the common type */
2800 ResultType = Expr2.Type;
2801 } else if (IsClassPtr (Expr2.Type) && Expr3IsNULL) {
2802 /* Result type is pointer, no cast needed */
2803 ResultType = Expr2.Type;
2804 } else if (Expr2IsNULL && IsClassPtr (Expr3.Type)) {
2805 /* Result type is pointer, no cast needed */
2806 ResultType = Expr3.Type;
2807 } else if (IsTypeVoid (Expr2.Type) && IsTypeVoid (Expr3.Type)) {
2808 /* Result type is void */
2809 ResultType = Expr3.Type;
2811 Error ("Incompatible types");
2812 ResultType = Expr2.Type; /* Doesn't matter here */
2815 /* Define the final label */
2816 g_defcodelabel (TrueLab);
2818 /* Setup the target expression */
2819 ED_MakeRValExpr (Expr);
2820 Expr->Type = ResultType;
2826 static void opeq (const GenDesc* Gen, ExprDesc* Expr)
2827 /* Process "op=" operators. */
2834 /* op= can only be used with lvalues */
2835 if (!ED_IsLVal (Expr)) {
2836 Error ("Invalid lvalue in assignment");
2840 /* The left side must not be const qualified */
2841 if (IsQualConst (Expr->Type)) {
2842 Error ("Assignment to const");
2845 /* There must be an integer or pointer on the left side */
2846 if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
2847 Error ("Invalid left operand type");
2848 /* Continue. Wrong code will be generated, but the compiler won't
2849 * break, so this is the best error recovery.
2853 /* Skip the operator token */
2856 /* Determine the type of the lhs */
2857 flags = TypeOf (Expr->Type);
2858 MustScale = (Gen->Func == g_add || Gen->Func == g_sub) && IsTypePtr (Expr->Type);
2860 /* Get the lhs address on stack (if needed) */
2863 /* Fetch the lhs into the primary register if needed */
2864 LoadExpr (CF_NONE, Expr);
2866 /* Bring the lhs on stack */
2870 /* Evaluate the rhs */
2871 if (evalexpr (CF_NONE, hie1, &Expr2) == 0) {
2872 /* The resulting value is a constant. If the generator has the NOPUSH
2873 * flag set, don't push the lhs.
2875 if (Gen->Flags & GEN_NOPUSH) {
2879 /* lhs is a pointer, scale rhs */
2880 Expr2.IVal *= CheckedSizeOf (Expr->Type+1);
2883 /* If the lhs is character sized, the operation may be later done
2886 if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
2887 flags |= CF_FORCECHAR;
2890 /* Special handling for add and sub - some sort of a hack, but short code */
2891 if (Gen->Func == g_add) {
2892 g_inc (flags | CF_CONST, Expr2.IVal);
2893 } else if (Gen->Func == g_sub) {
2894 g_dec (flags | CF_CONST, Expr2.IVal);
2896 if (Expr2.IVal == 0) {
2897 /* Check for div by zero/mod by zero */
2898 if (Gen->Func == g_div) {
2899 Error ("Division by zero");
2900 } else if (Gen->Func == g_mod) {
2901 Error ("Modulo operation with zero");
2904 Gen->Func (flags | CF_CONST, Expr2.IVal);
2907 /* rhs is not constant and already in the primary register */
2909 /* lhs is a pointer, scale rhs */
2910 g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Expr->Type+1));
2913 /* If the lhs is character sized, the operation may be later done
2916 if (CheckedSizeOf (Expr->Type) == SIZEOF_CHAR) {
2917 flags |= CF_FORCECHAR;
2920 /* Adjust the types of the operands if needed */
2921 Gen->Func (g_typeadjust (flags, TypeOf (Expr2.Type)), 0);
2924 ED_MakeRValExpr (Expr);
2929 static void addsubeq (const GenDesc* Gen, ExprDesc *Expr)
2930 /* Process the += and -= operators */
2938 /* We're currently only able to handle some adressing modes */
2939 if (ED_GetLoc (Expr) == E_LOC_EXPR || ED_GetLoc (Expr) == E_LOC_PRIMARY) {
2940 /* Use generic routine */
2945 /* We must have an lvalue */
2946 if (ED_IsRVal (Expr)) {
2947 Error ("Invalid lvalue in assignment");
2951 /* The left side must not be const qualified */
2952 if (IsQualConst (Expr->Type)) {
2953 Error ("Assignment to const");
2956 /* There must be an integer or pointer on the left side */
2957 if (!IsClassInt (Expr->Type) && !IsTypePtr (Expr->Type)) {
2958 Error ("Invalid left operand type");
2959 /* Continue. Wrong code will be generated, but the compiler won't
2960 * break, so this is the best error recovery.
2964 /* Skip the operator */
2967 /* Check if we have a pointer expression and must scale rhs */
2968 MustScale = IsTypePtr (Expr->Type);
2970 /* Initialize the code generator flags */
2974 /* Evaluate the rhs */
2976 if (ED_IsConstAbs (&Expr2)) {
2977 /* The resulting value is a constant. Scale it. */
2979 Expr2.IVal *= CheckedSizeOf (Indirect (Expr->Type));
2984 /* Not constant, load into the primary */
2985 LoadExpr (CF_NONE, &Expr2);
2987 /* lhs is a pointer, scale rhs */
2988 g_scale (TypeOf (Expr2.Type), CheckedSizeOf (Indirect (Expr->Type)));
2992 /* Setup the code generator flags */
2993 lflags |= TypeOf (Expr->Type) | GlobalModeFlags (Expr) | CF_FORCECHAR;
2994 rflags |= TypeOf (Expr2.Type) | CF_FORCECHAR;
2996 /* Convert the type of the lhs to that of the rhs */
2997 g_typecast (lflags, rflags);
2999 /* Output apropriate code depending on the location */
3000 switch (ED_GetLoc (Expr)) {
3003 /* Absolute: numeric address or const */
3004 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3005 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3007 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3012 /* Global variable */
3013 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3014 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3016 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3022 /* Static variable or literal in the literal pool */
3023 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3024 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3026 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3030 case E_LOC_REGISTER:
3031 /* Register variable */
3032 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3033 g_addeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3035 g_subeqstatic (lflags, Expr->Name, Expr->IVal, Expr2.IVal);
3040 /* Value on the stack */
3041 if (Gen->Tok == TOK_PLUS_ASSIGN) {
3042 g_addeqlocal (lflags, Expr->IVal, Expr2.IVal);
3044 g_subeqlocal (lflags, Expr->IVal, Expr2.IVal);
3049 Internal ("Invalid location in Store(): 0x%04X", ED_GetLoc (Expr));
3052 /* Expression is a rvalue in the primary now */
3053 ED_MakeRValExpr (Expr);
3058 void hie1 (ExprDesc* Expr)
3059 /* Parse first level of expression hierarchy. */
3062 switch (CurTok.Tok) {
3068 case TOK_PLUS_ASSIGN:
3069 addsubeq (&GenPASGN, Expr);
3072 case TOK_MINUS_ASSIGN:
3073 addsubeq (&GenSASGN, Expr);
3076 case TOK_MUL_ASSIGN:
3077 opeq (&GenMASGN, Expr);
3080 case TOK_DIV_ASSIGN:
3081 opeq (&GenDASGN, Expr);
3084 case TOK_MOD_ASSIGN:
3085 opeq (&GenMOASGN, Expr);
3088 case TOK_SHL_ASSIGN:
3089 opeq (&GenSLASGN, Expr);
3092 case TOK_SHR_ASSIGN:
3093 opeq (&GenSRASGN, Expr);
3096 case TOK_AND_ASSIGN:
3097 opeq (&GenAASGN, Expr);
3100 case TOK_XOR_ASSIGN:
3101 opeq (&GenXOASGN, Expr);
3105 opeq (&GenOASGN, Expr);
3115 void hie0 (ExprDesc *Expr)
3116 /* Parse comma operator. */
3119 while (CurTok.Tok == TOK_COMMA) {
3127 int evalexpr (unsigned Flags, void (*Func) (ExprDesc*), ExprDesc* Expr)
3128 /* Will evaluate an expression via the given function. If the result is a
3129 * constant, 0 is returned and the value is put in the Expr struct. If the
3130 * result is not constant, LoadExpr is called to bring the value into the
3131 * primary register and 1 is returned.
3135 ExprWithCheck (Func, Expr);
3137 /* Check for a constant expression */
3138 if (ED_IsConstAbs (Expr)) {
3139 /* Constant expression */
3142 /* Not constant, load into the primary */
3143 LoadExpr (Flags, Expr);
3150 void Expression0 (ExprDesc* Expr)
3151 /* Evaluate an expression via hie0 and put the result into the primary register */
3153 ExprWithCheck (hie0, Expr);
3154 LoadExpr (CF_NONE, Expr);
3159 void ConstExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3160 /* Will evaluate an expression via the given function. If the result is not
3161 * a constant of some sort, a diagnostic will be printed, and the value is
3162 * replaced by a constant one to make sure there are no internal errors that
3163 * result from this input error.
3166 ExprWithCheck (Func, Expr);
3167 if (!ED_IsConst (Expr)) {
3168 Error ("Constant expression expected");
3169 /* To avoid any compiler errors, make the expression a valid const */
3170 ED_MakeConstAbsInt (Expr, 1);
3176 void BoolExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3177 /* Will evaluate an expression via the given function. If the result is not
3178 * something that may be evaluated in a boolean context, a diagnostic will be
3179 * printed, and the value is replaced by a constant one to make sure there
3180 * are no internal errors that result from this input error.
3183 ExprWithCheck (Func, Expr);
3184 if (!ED_IsBool (Expr)) {
3185 Error ("Boolean expression expected");
3186 /* To avoid any compiler errors, make the expression a valid int */
3187 ED_MakeConstAbsInt (Expr, 1);
3193 void ConstAbsIntExpr (void (*Func) (ExprDesc*), ExprDesc* Expr)
3194 /* Will evaluate an expression via the given function. If the result is not
3195 * a constant numeric integer value, a diagnostic will be printed, and the
3196 * value is replaced by a constant one to make sure there are no internal
3197 * errors that result from this input error.
3200 ExprWithCheck (Func, Expr);
3201 if (!ED_IsConstAbsInt (Expr)) {
3202 Error ("Constant integer expression expected");
3203 /* To avoid any compiler errors, make the expression a valid const */
3204 ED_MakeConstAbsInt (Expr, 1);