1 /*****************************************************************************/
5 /* 6502 code generator */
9 /* (C) 1998-2001 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
63 /*****************************************************************************/
65 /*****************************************************************************/
69 /* Compiler relative stack pointer */
74 /*****************************************************************************/
76 /*****************************************************************************/
80 static void typeerror (unsigned type)
81 /* Print an error message about an invalid operand type */
83 Internal ("Invalid type in CF flags: %04X, type = %u", type, type & CF_TYPE);
88 static void CheckLocalOffs (unsigned Offs)
89 /* Check the offset into the stack for 8bit range */
92 /* Too many local vars */
93 Error ("Too many local variables");
99 static char* GetLabelName (unsigned flags, unsigned long label, unsigned offs)
101 static char lbuf [128]; /* Label name */
103 /* Create the correct label name */
104 switch (flags & CF_ADDRMASK) {
107 /* Static memory cell */
108 sprintf (lbuf, "%s+%u", LocalLabelName (label), offs);
113 sprintf (lbuf, "_%s+%u", (char*) label, offs);
117 /* Absolute address */
118 sprintf (lbuf, "$%04X", (unsigned)((label+offs) & 0xFFFF));
122 /* Variable in register bank */
123 sprintf (lbuf, "regbank+%u", (unsigned)((label+offs) & 0xFFFF));
127 Internal ("Invalid address flags");
130 /* Return a pointer to the static buffer */
136 /*****************************************************************************/
137 /* Pre- and postamble */
138 /*****************************************************************************/
142 void g_preamble (void)
143 /* Generate the assembler code preamble */
145 /* Create a new (global) segment list and remember it */
149 /* Identify the compiler version */
151 AddTextLine ("; File generated by cc65 v %u.%u.%u",
152 VER_MAJOR, VER_MINOR, VER_PATCH);
155 /* Insert some object file options */
156 AddTextLine ("\t.fopt\t\tcompiler,\"cc65 v %u.%u.%u\"",
157 VER_MAJOR, VER_MINOR, VER_PATCH);
159 /* If we're producing code for some other CPU, switch the command set */
160 if (CPU == CPU_65C02) {
161 AddTextLine ("\t.pc02");
164 /* Allow auto import for runtime library routines */
165 AddTextLine ("\t.autoimport\ton");
167 /* Switch the assembler into case sensitive mode */
168 AddTextLine ("\t.case\t\ton");
170 /* Tell the assembler if we want to generate debug info */
171 AddTextLine ("\t.debuginfo\t%s", (DebugInfo != 0)? "on" : "off");
173 /* Import the stack pointer for direct auto variable access */
174 AddTextLine ("\t.importzp\tsp, sreg, regsave, regbank, tmp1, ptr1, ptr2");
176 /* Define long branch macros */
177 AddTextLine ("\t.macpack\tlongbranch");
182 void g_fileinfo (const char* Name, unsigned long Size, unsigned long MTime)
183 /* If debug info is enabled, place a file info into the source */
186 /* We have to place this into the global text segment, so it will
187 * appear before all .dbg line statements.
189 TS_AddLine (GS->Text, "\t.dbg\t\tfile, \"%s\", %lu, %lu", Name, Size, MTime);
195 /*****************************************************************************/
196 /* Segment support */
197 /*****************************************************************************/
201 void g_userodata (void)
202 /* Switch to the read only data segment */
204 UseDataSeg (SEG_RODATA);
209 void g_usedata (void)
210 /* Switch to the data segment */
212 UseDataSeg (SEG_DATA);
218 /* Switch to the bss segment */
220 UseDataSeg (SEG_BSS);
225 void g_segname (segment_t Seg, const char* Name)
226 /* Set the name of a segment */
230 /* Remember the new name */
231 NewSegName (Seg, Name);
233 /* Emit a segment directive for the data style segments */
235 case SEG_RODATA: S = CS->ROData; break;
236 case SEG_DATA: S = CS->Data; break;
237 case SEG_BSS: S = CS->BSS; break;
238 default: S = 0; break;
241 DS_AddLine (S, ".segment\t\"%s\"", Name);
247 /*****************************************************************************/
249 /*****************************************************************************/
253 unsigned sizeofarg (unsigned flags)
254 /* Return the size of a function argument type that is encoded in flags */
256 switch (flags & CF_TYPE) {
259 return (flags & CF_FORCECHAR)? 1 : 2;
276 int pop (unsigned flags)
277 /* Pop an argument of the given size */
279 return oursp += sizeofarg (flags);
284 int push (unsigned flags)
285 /* Push an argument of the given size */
287 return oursp -= sizeofarg (flags);
292 static unsigned MakeByteOffs (unsigned Flags, unsigned Offs)
293 /* The value in Offs is an offset to an address in a/x. Make sure, an object
294 * of the type given in Flags can be loaded or stored into this address by
295 * adding part of the offset to the address in ax, so that the remaining
296 * offset fits into an index register. Return the remaining offset.
299 /* If the offset is too large for a byte register, add the high byte
300 * of the offset to the primary. Beware: We need a special correction
301 * if the offset in the low byte will overflow in the operation.
303 unsigned O = Offs & ~0xFFU;
304 if ((Offs & 0xFF) > 256 - sizeofarg (Flags)) {
305 /* We need to add the low byte also */
309 /* Do the correction if we need one */
311 g_inc (CF_INT | CF_CONST, O);
315 /* Return the new offset */
321 /*****************************************************************************/
322 /* Functions handling local labels */
323 /*****************************************************************************/
327 void g_defcodelabel (unsigned label)
328 /* Define a local code label */
330 CS_AddLabel (CS->Code, LocalLabelName (label));
335 void g_defdatalabel (unsigned label)
336 /* Define a local data label */
338 AddDataLine ("%s:", LocalLabelName (label));
343 /*****************************************************************************/
344 /* Functions handling global labels */
345 /*****************************************************************************/
349 void g_defgloblabel (const char* Name)
350 /* Define a global label with the given name */
352 /* Global labels are always data labels */
353 AddDataLine ("_%s:", Name);
358 void g_defexport (const char* Name, int ZP)
359 /* Export the given label */
362 AddTextLine ("\t.exportzp\t_%s", Name);
364 AddTextLine ("\t.export\t\t_%s", Name);
370 void g_defimport (const char* Name, int ZP)
371 /* Import the given label */
374 AddTextLine ("\t.importzp\t_%s", Name);
376 AddTextLine ("\t.import\t\t_%s", Name);
382 /*****************************************************************************/
383 /* Load functions for various registers */
384 /*****************************************************************************/
388 static void ldaconst (unsigned val)
389 /* Load a with a constant */
391 AddCodeLine ("lda #$%02X", val & 0xFF);
396 static void ldxconst (unsigned val)
397 /* Load x with a constant */
399 AddCodeLine ("ldx #$%02X", val & 0xFF);
404 static void ldyconst (unsigned val)
405 /* Load y with a constant */
407 AddCodeLine ("ldy #$%02X", val & 0xFF);
412 /*****************************************************************************/
413 /* Function entry and exit */
414 /*****************************************************************************/
418 /* Remember the argument size of a function. The variable is set by g_enter
419 * and used by g_leave. If the functions gets its argument size by the caller
420 * (variable param list or function without prototype), g_enter will set the
426 void g_enter (unsigned flags, unsigned argsize)
427 /* Function prologue */
429 if ((flags & CF_FIXARGC) != 0) {
430 /* Just remember the argument size for the leave */
434 AddCodeLine ("jsr enter");
441 /* Function epilogue */
443 /* How many bytes of locals do we have to drop? */
446 /* If we didn't have a variable argument list, don't call leave */
449 /* Drop stackframe if needed */
453 AddCodeLine ("jsr incsp%d", k);
457 AddCodeLine ("jsr addysp");
464 /* Nothing to drop */
465 AddCodeLine ("jsr leave");
467 /* We've a stack frame to drop */
469 AddCodeLine ("jsr leavey");
473 /* Add the final rts */
479 /*****************************************************************************/
480 /* Register variables */
481 /*****************************************************************************/
485 void g_save_regvars (int RegOffs, unsigned Bytes)
486 /* Save register variables */
488 /* Don't loop for up to two bytes */
491 AddCodeLine ("lda regbank%+d", RegOffs);
492 AddCodeLine ("jsr pusha");
494 } else if (Bytes == 2) {
496 AddCodeLine ("lda regbank%+d", RegOffs);
497 AddCodeLine ("ldx regbank%+d", RegOffs+1);
498 AddCodeLine ("jsr pushax");
502 /* More than two bytes - loop */
503 unsigned Label = GetLocalLabel ();
505 ldyconst (Bytes - 1);
507 g_defcodelabel (Label);
508 AddCodeLine ("lda regbank%+d,x", RegOffs-1);
509 AddCodeLine ("sta (sp),y");
512 AddCodeLine ("bne %s", LocalLabelName (Label));
516 /* We pushed stuff, correct the stack pointer */
522 void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
523 /* Restore register variables */
525 /* Calculate the actual stack offset and check it */
527 CheckLocalOffs (StackOffs);
529 /* Don't loop for up to two bytes */
532 ldyconst (StackOffs);
533 AddCodeLine ("lda (sp),y");
534 AddCodeLine ("sta regbank%+d", RegOffs);
536 } else if (Bytes == 2) {
538 ldyconst (StackOffs);
539 AddCodeLine ("lda (sp),y");
540 AddCodeLine ("sta regbank%+d", RegOffs);
542 AddCodeLine ("lda (sp),y");
543 AddCodeLine ("sta regbank%+d", RegOffs+1);
547 /* More than two bytes - loop */
548 unsigned Label = GetLocalLabel ();
549 ldyconst (StackOffs+Bytes-1);
551 g_defcodelabel (Label);
552 AddCodeLine ("lda (sp),y");
553 AddCodeLine ("sta regbank%+d,x", RegOffs-1);
556 AddCodeLine ("bne %s", LocalLabelName (Label));
563 /*****************************************************************************/
564 /* Fetching memory cells */
565 /*****************************************************************************/
569 void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs)
570 /* Load a constant into the primary register */
572 unsigned char B1, B2, B3, B4;
576 if ((Flags & CF_CONST) != 0) {
578 /* Numeric constant */
579 switch (Flags & CF_TYPE) {
582 if ((Flags & CF_FORCECHAR) != 0) {
588 ldxconst ((Val >> 8) & 0xFF);
589 ldaconst (Val & 0xFF);
593 /* Split the value into 4 bytes */
594 B1 = (unsigned char) (Val >> 0);
595 B2 = (unsigned char) (Val >> 8);
596 B3 = (unsigned char) (Val >> 16);
597 B4 = (unsigned char) (Val >> 24);
599 /* Remember which bytes are done */
603 AddCodeLine ("ldx #$%02X", B2);
606 AddCodeLine ("stx sreg");
610 AddCodeLine ("stx sreg+1");
613 if ((Done & 0x04) == 0 && B1 != B3) {
614 AddCodeLine ("lda #$%02X", B3);
615 AddCodeLine ("sta sreg");
618 if ((Done & 0x08) == 0 && B1 != B4) {
619 AddCodeLine ("lda #$%02X", B4);
620 AddCodeLine ("sta sreg+1");
623 AddCodeLine ("lda #$%02X", B1);
625 if ((Done & 0x04) == 0) {
627 AddCodeLine ("sta sreg");
629 if ((Done & 0x08) == 0) {
631 AddCodeLine ("sta sreg+1");
643 /* Some sort of label */
644 const char* Label = GetLabelName (Flags, Val, Offs);
646 /* Load the address into the primary */
647 AddCodeLine ("lda #<(%s)", Label);
648 AddCodeLine ("ldx #>(%s)", Label);
655 void g_getstatic (unsigned flags, unsigned long label, unsigned offs)
656 /* Fetch an static memory cell into the primary register */
658 /* Create the correct label name */
659 char* lbuf = GetLabelName (flags, label, offs);
661 /* Check the size and generate the correct load operation */
662 switch (flags & CF_TYPE) {
665 if ((flags & CF_FORCECHAR) || (flags & CF_TEST)) {
666 AddCodeLine ("lda %s", lbuf); /* load A from the label */
669 AddCodeLine ("lda %s", lbuf); /* load A from the label */
670 if (!(flags & CF_UNSIGNED)) {
671 /* Must sign extend */
672 unsigned L = GetLocalLabel ();
673 AddCodeLine ("bpl %s", LocalLabelName (L));
681 AddCodeLine ("lda %s", lbuf);
682 if (flags & CF_TEST) {
683 AddCodeLine ("ora %s+1", lbuf);
685 AddCodeLine ("ldx %s+1", lbuf);
690 if (flags & CF_TEST) {
691 AddCodeLine ("lda %s+3", lbuf);
692 AddCodeLine ("ora %s+2", lbuf);
693 AddCodeLine ("ora %s+1", lbuf);
694 AddCodeLine ("ora %s+0", lbuf);
696 AddCodeLine ("lda %s+3", lbuf);
697 AddCodeLine ("sta sreg+1");
698 AddCodeLine ("lda %s+2", lbuf);
699 AddCodeLine ("sta sreg");
700 AddCodeLine ("ldx %s+1", lbuf);
701 AddCodeLine ("lda %s", lbuf);
713 void g_getlocal (unsigned flags, int offs)
714 /* Fetch specified local object (local var). */
717 CheckLocalOffs (offs);
718 switch (flags & CF_TYPE) {
721 if ((flags & CF_FORCECHAR) || (flags & CF_TEST)) {
723 AddCodeLine ("lda (sp),y");
726 AddCodeLine ("ldx #$00");
727 AddCodeLine ("lda (sp),y");
728 if ((flags & CF_UNSIGNED) == 0) {
729 unsigned L = GetLocalLabel();
730 AddCodeLine ("bpl %s", LocalLabelName (L));
738 CheckLocalOffs (offs + 1);
739 if (flags & CF_TEST) {
741 AddCodeLine ("lda (sp),y");
743 AddCodeLine ("ora (sp),y");
746 AddCodeLine ("jsr ldaxysp");
752 AddCodeLine ("jsr ldeaxysp");
762 void g_getind (unsigned flags, unsigned offs)
763 /* Fetch the specified object type indirect through the primary register
764 * into the primary register
767 /* If the offset is greater than 255, add the part that is > 255 to
768 * the primary. This way we get an easy addition and use the low byte
771 offs = MakeByteOffs (flags, offs);
773 /* Handle the indirect fetch */
774 switch (flags & CF_TYPE) {
777 /* Character sized */
778 if (flags & CF_UNSIGNED) {
780 AddCodeLine ("jsr ldauidx");
783 AddCodeLine ("jsr ldaidx");
788 if (flags & CF_TEST) {
790 AddCodeLine ("sta ptr1");
791 AddCodeLine ("stx ptr1+1");
792 AddCodeLine ("lda (ptr1),y");
794 AddCodeLine ("ora (ptr1),y");
797 AddCodeLine ("jsr ldaxidx");
803 AddCodeLine ("jsr ldeaxidx");
804 if (flags & CF_TEST) {
805 AddCodeLine ("jsr tsteax");
817 void g_leasp (int offs)
818 /* Fetch the address of the specified symbol into the primary register */
820 /* Calculate the offset relative to sp */
823 /* For value 0 we do direct code */
825 AddCodeLine ("lda sp");
826 AddCodeLine ("ldx sp+1");
828 if (CodeSizeFactor < 300) {
829 ldaconst (offs); /* Load A with offset value */
830 AddCodeLine ("jsr leaasp"); /* Load effective address */
832 unsigned L = GetLocalLabel ();
833 if (CPU == CPU_65C02 && offs == 1) {
834 AddCodeLine ("lda sp");
835 AddCodeLine ("ldx sp+1");
837 AddCodeLine ("bne %s", LocalLabelName (L));
842 AddCodeLine ("ldx sp+1");
843 AddCodeLine ("adc sp");
844 AddCodeLine ("bcc %s", LocalLabelName (L));
854 void g_leavariadic (int Offs)
855 /* Fetch the address of a parameter in a variadic function into the primary
859 unsigned ArgSizeOffs;
861 /* Calculate the offset relative to sp */
864 /* Get the offset of the parameter which is stored at sp+0 on function
865 * entry and check if this offset is reachable with a byte offset.
868 ArgSizeOffs = -oursp;
869 CheckLocalOffs (ArgSizeOffs);
871 /* Get the size of all parameters. */
872 ldyconst (ArgSizeOffs);
873 AddCodeLine ("lda (sp),y");
875 /* Add the value of the stackpointer */
876 if (CodeSizeFactor > 250) {
877 unsigned L = GetLocalLabel();
878 AddCodeLine ("ldx sp+1");
880 AddCodeLine ("adc sp");
881 AddCodeLine ("bcc %s", LocalLabelName (L));
885 AddCodeLine ("jsr leaasp");
888 /* Add the offset to the primary */
890 g_inc (CF_INT | CF_CONST, Offs);
891 } else if (Offs < 0) {
892 g_dec (CF_INT | CF_CONST, -Offs);
898 /*****************************************************************************/
899 /* Store into memory */
900 /*****************************************************************************/
904 void g_putstatic (unsigned flags, unsigned long label, unsigned offs)
905 /* Store the primary register into the specified static memory cell */
907 /* Create the correct label name */
908 char* lbuf = GetLabelName (flags, label, offs);
910 /* Check the size and generate the correct store operation */
911 switch (flags & CF_TYPE) {
914 AddCodeLine ("sta %s", lbuf);
918 AddCodeLine ("sta %s", lbuf);
919 AddCodeLine ("stx %s+1", lbuf);
923 AddCodeLine ("sta %s", lbuf);
924 AddCodeLine ("stx %s+1", lbuf);
925 AddCodeLine ("ldy sreg");
926 AddCodeLine ("sty %s+2", lbuf);
927 AddCodeLine ("ldy sreg+1");
928 AddCodeLine ("sty %s+3", lbuf);
939 void g_putlocal (unsigned Flags, int Offs, long Val)
940 /* Put data into local object. */
943 CheckLocalOffs (Offs);
944 switch (Flags & CF_TYPE) {
947 if (Flags & CF_CONST) {
948 AddCodeLine ("lda #$%02X", (unsigned char) Val);
951 AddCodeLine ("sta (sp),y");
955 if (Flags & CF_CONST) {
957 AddCodeLine ("lda #$%02X", (unsigned char) (Val >> 8));
958 AddCodeLine ("sta (sp),y");
959 if ((Flags & CF_NOKEEP) == 0) {
960 /* Place high byte into X */
963 if ((Val & 0xFF) == Offs+1) {
964 /* The value we need is already in Y */
969 AddCodeLine ("lda #$%02X", (unsigned char) Val);
971 AddCodeLine ("sta (sp),y");
973 if ((Flags & CF_NOKEEP) == 0 || CodeSizeFactor < 160) {
975 AddCodeLine ("jsr staxysp");
978 AddCodeLine ("sta (sp),y");
981 AddCodeLine ("sta (sp),y");
987 if (Flags & CF_CONST) {
988 g_getimmed (Flags, Val, 0);
991 AddCodeLine ("jsr steaxysp");
1002 void g_putind (unsigned Flags, unsigned Offs)
1003 /* Store the specified object type in the primary register at the address
1004 * on the top of the stack
1007 /* We can handle offsets below $100 directly, larger offsets must be added
1008 * to the address. Since a/x is in use, best code is achieved by adding
1009 * just the high byte. Be sure to check if the low byte will overflow while
1012 if ((Offs & 0xFF) > 256 - sizeofarg (Flags | CF_FORCECHAR)) {
1014 /* Overflow - we need to add the low byte also */
1015 AddCodeLine ("ldy #$00");
1016 AddCodeLine ("clc");
1017 AddCodeLine ("pha");
1018 AddCodeLine ("lda #$%02X", Offs & 0xFF);
1019 AddCodeLine ("adc (sp),y");
1020 AddCodeLine ("sta (sp),y");
1021 AddCodeLine ("iny");
1022 AddCodeLine ("lda #$%02X", (Offs >> 8) & 0xFF);
1023 AddCodeLine ("adc (sp),y");
1024 AddCodeLine ("sta (sp),y");
1025 AddCodeLine ("pla");
1027 /* Complete address is on stack, new offset is zero */
1030 } else if ((Offs & 0xFF00) != 0) {
1032 /* We can just add the high byte */
1033 AddCodeLine ("ldy #$01");
1034 AddCodeLine ("clc");
1035 AddCodeLine ("pha");
1036 AddCodeLine ("lda #$%02X", (Offs >> 8) & 0xFF);
1037 AddCodeLine ("adc (sp),y");
1038 AddCodeLine ("sta (sp),y");
1039 AddCodeLine ("pla");
1041 /* Offset is now just the low byte */
1045 /* Check the size and determine operation */
1046 switch (Flags & CF_TYPE) {
1050 AddCodeLine ("jsr staspidx");
1055 AddCodeLine ("jsr staxspidx");
1060 AddCodeLine ("jsr steaxspidx");
1068 /* Pop the argument which is always a pointer */
1074 /*****************************************************************************/
1075 /* type conversion and similiar stuff */
1076 /*****************************************************************************/
1080 void g_toslong (unsigned flags)
1081 /* Make sure, the value on TOS is a long. Convert if necessary */
1083 switch (flags & CF_TYPE) {
1087 if (flags & CF_UNSIGNED) {
1088 AddCodeLine ("jsr tosulong");
1090 AddCodeLine ("jsr toslong");
1105 void g_tosint (unsigned flags)
1106 /* Make sure, the value on TOS is an int. Convert if necessary */
1108 switch (flags & CF_TYPE) {
1115 AddCodeLine ("jsr tosint");
1126 void g_reglong (unsigned flags)
1127 /* Make sure, the value in the primary register a long. Convert if necessary */
1129 switch (flags & CF_TYPE) {
1133 if (flags & CF_UNSIGNED) {
1134 if (CodeSizeFactor >= 200) {
1136 AddCodeLine ("sty sreg");
1137 AddCodeLine ("sty sreg+1");
1139 AddCodeLine ("jsr axulong");
1142 AddCodeLine ("jsr axlong");
1156 unsigned g_typeadjust (unsigned lhs, unsigned rhs)
1157 /* Adjust the integer operands before doing a binary operation. lhs is a flags
1158 * value, that corresponds to the value on TOS, rhs corresponds to the value
1159 * in (e)ax. The return value is the the flags value for the resulting type.
1162 unsigned ltype, rtype;
1165 /* Get the type spec from the flags */
1166 ltype = lhs & CF_TYPE;
1167 rtype = rhs & CF_TYPE;
1169 /* Check if a conversion is needed */
1170 if (ltype == CF_LONG && rtype != CF_LONG && (rhs & CF_CONST) == 0) {
1171 /* We must promote the primary register to long */
1173 /* Get the new rhs type */
1174 rhs = (rhs & ~CF_TYPE) | CF_LONG;
1176 } else if (ltype != CF_LONG && (lhs & CF_CONST) == 0 && rtype == CF_LONG) {
1177 /* We must promote the lhs to long */
1183 /* Get the new rhs type */
1184 lhs = (lhs & ~CF_TYPE) | CF_LONG;
1188 /* Determine the result type for the operation:
1189 * - The result is const if both operands are const.
1190 * - The result is unsigned if one of the operands is unsigned.
1191 * - The result is long if one of the operands is long.
1192 * - Otherwise the result is int sized.
1194 result = (lhs & CF_CONST) & (rhs & CF_CONST);
1195 result |= (lhs & CF_UNSIGNED) | (rhs & CF_UNSIGNED);
1196 if (rtype == CF_LONG || ltype == CF_LONG) {
1206 unsigned g_typecast (unsigned lhs, unsigned rhs)
1207 /* Cast the value in the primary register to the operand size that is flagged
1208 * by the lhs value. Return the result value.
1211 unsigned ltype, rtype;
1213 /* Get the type spec from the flags */
1214 ltype = lhs & CF_TYPE;
1215 rtype = rhs & CF_TYPE;
1217 /* Check if a conversion is needed */
1218 if (ltype == CF_LONG && rtype != CF_LONG && (rhs & CF_CONST) == 0) {
1219 /* We must promote the primary register to long */
1223 /* Do not need any other action. If the left type is int, and the primary
1224 * register is long, it will be automagically truncated. If the right hand
1225 * side is const, it is not located in the primary register and handled by
1226 * the expression parser code.
1229 /* Result is const if the right hand side was const */
1230 lhs |= (rhs & CF_CONST);
1232 /* The resulting type is that of the left hand side (that's why you called
1240 void g_scale (unsigned flags, long val)
1241 /* Scale the value in the primary register by the given value. If val is positive,
1242 * scale up, is val is negative, scale down. This function is used to scale
1243 * the operands or results of pointer arithmetic by the size of the type, the
1244 * pointer points to.
1249 /* Value may not be zero */
1251 Internal ("Data type has no size");
1252 } else if (val > 0) {
1255 if ((p2 = powerof2 (val)) > 0 && p2 <= 4) {
1257 /* Factor is 2, 4, 8 and 16, use special function */
1258 switch (flags & CF_TYPE) {
1261 if (flags & CF_FORCECHAR) {
1263 AddCodeLine ("asl a");
1270 if (CodeSizeFactor >= (p2+1)*130U) {
1271 AddCodeLine ("stx tmp1");
1273 AddCodeLine ("asl a");
1274 AddCodeLine ("rol tmp1");
1276 AddCodeLine ("ldx tmp1");
1278 if (flags & CF_UNSIGNED) {
1279 AddCodeLine ("jsr shlax%d", p2);
1281 AddCodeLine ("jsr aslax%d", p2);
1287 if (flags & CF_UNSIGNED) {
1288 AddCodeLine ("jsr shleax%d", p2);
1290 AddCodeLine ("jsr asleax%d", p2);
1299 } else if (val != 1) {
1301 /* Use a multiplication instead */
1302 g_mul (flags | CF_CONST, val);
1310 if ((p2 = powerof2 (val)) > 0 && p2 <= 4) {
1312 /* Factor is 2, 4, 8 and 16 use special function */
1313 switch (flags & CF_TYPE) {
1316 if (flags & CF_FORCECHAR) {
1317 if (flags & CF_UNSIGNED) {
1319 AddCodeLine ("lsr a");
1322 } else if (p2 <= 2) {
1323 AddCodeLine ("cmp #$80");
1324 AddCodeLine ("ror a");
1331 if (flags & CF_UNSIGNED) {
1332 if (CodeSizeFactor >= (p2+1)*130U) {
1333 AddCodeLine ("stx tmp1");
1335 AddCodeLine ("lsr tmp1");
1336 AddCodeLine ("ror a");
1338 AddCodeLine ("ldx tmp1");
1340 AddCodeLine ("jsr lsrax%d", p2);
1343 if (CodeSizeFactor >= (p2+1)*150U) {
1344 AddCodeLine ("stx tmp1");
1346 AddCodeLine ("cpx #$80");
1347 AddCodeLine ("ror tmp1");
1348 AddCodeLine ("ror a");
1350 AddCodeLine ("ldx tmp1");
1352 AddCodeLine ("jsr asrax%d", p2);
1358 if (flags & CF_UNSIGNED) {
1359 AddCodeLine ("jsr lsreax%d", p2);
1361 AddCodeLine ("jsr asreax%d", p2);
1370 } else if (val != 1) {
1372 /* Use a division instead */
1373 g_div (flags | CF_CONST, val);
1381 /*****************************************************************************/
1382 /* Adds and subs of variables fix a fixed address */
1383 /*****************************************************************************/
1387 void g_addlocal (unsigned flags, int offs)
1388 /* Add a local variable to ax */
1392 /* Correct the offset and check it */
1394 CheckLocalOffs (offs);
1396 switch (flags & CF_TYPE) {
1399 L = GetLocalLabel();
1400 AddCodeLine ("ldy #$%02X", offs & 0xFF);
1401 AddCodeLine ("clc");
1402 AddCodeLine ("adc (sp),y");
1403 AddCodeLine ("bcc %s", LocalLabelName (L));
1404 AddCodeLine ("inx");
1409 AddCodeLine ("ldy #$%02X", offs & 0xFF);
1410 AddCodeLine ("clc");
1411 AddCodeLine ("adc (sp),y");
1412 AddCodeLine ("pha");
1413 AddCodeLine ("txa");
1414 AddCodeLine ("iny");
1415 AddCodeLine ("adc (sp),y");
1416 AddCodeLine ("tax");
1417 AddCodeLine ("pla");
1421 /* Do it the old way */
1423 g_getlocal (flags, offs);
1435 void g_addstatic (unsigned flags, unsigned long label, unsigned offs)
1436 /* Add a static variable to ax */
1440 /* Create the correct label name */
1441 char* lbuf = GetLabelName (flags, label, offs);
1443 switch (flags & CF_TYPE) {
1446 L = GetLocalLabel();
1447 AddCodeLine ("clc");
1448 AddCodeLine ("adc %s", lbuf);
1449 AddCodeLine ("bcc %s", LocalLabelName (L));
1450 AddCodeLine ("inx");
1455 AddCodeLine ("clc");
1456 AddCodeLine ("adc %s", lbuf);
1457 AddCodeLine ("tay");
1458 AddCodeLine ("txa");
1459 AddCodeLine ("adc %s+1", lbuf);
1460 AddCodeLine ("tax");
1461 AddCodeLine ("tya");
1465 /* Do it the old way */
1467 g_getstatic (flags, label, offs);
1479 /*****************************************************************************/
1480 /* Special op= functions */
1481 /*****************************************************************************/
1485 void g_addeqstatic (unsigned flags, unsigned long label, unsigned offs,
1487 /* Emit += for a static variable */
1489 /* Create the correct label name */
1490 char* lbuf = GetLabelName (flags, label, offs);
1492 /* Check the size and determine operation */
1493 switch (flags & CF_TYPE) {
1496 if (flags & CF_FORCECHAR) {
1497 AddCodeLine ("ldx #$00");
1498 if (flags & CF_CONST) {
1500 AddCodeLine ("inc %s", lbuf);
1501 AddCodeLine ("lda %s", lbuf);
1503 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1504 AddCodeLine ("clc");
1505 AddCodeLine ("adc %s", lbuf);
1506 AddCodeLine ("sta %s", lbuf);
1509 AddCodeLine ("clc");
1510 AddCodeLine ("adc %s", lbuf);
1511 AddCodeLine ("sta %s", lbuf);
1513 if ((flags & CF_UNSIGNED) == 0) {
1514 unsigned L = GetLocalLabel();
1515 AddCodeLine ("bpl %s", LocalLabelName (L));
1516 AddCodeLine ("dex");
1524 if (flags & CF_CONST) {
1526 unsigned L = GetLocalLabel ();
1527 AddCodeLine ("inc %s", lbuf);
1528 AddCodeLine ("bne %s", LocalLabelName (L));
1529 AddCodeLine ("inc %s+1", lbuf);
1531 AddCodeLine ("lda %s", lbuf); /* Hmmm... */
1532 AddCodeLine ("ldx %s+1", lbuf);
1534 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1535 AddCodeLine ("clc");
1536 AddCodeLine ("adc %s", lbuf);
1537 AddCodeLine ("sta %s", lbuf);
1539 unsigned L = GetLocalLabel ();
1540 AddCodeLine ("bcc %s", LocalLabelName (L));
1541 AddCodeLine ("inc %s+1", lbuf);
1543 AddCodeLine ("ldx %s+1", lbuf);
1545 AddCodeLine ("lda #$%02X", (unsigned char)(val >> 8));
1546 AddCodeLine ("adc %s+1", lbuf);
1547 AddCodeLine ("sta %s+1", lbuf);
1548 AddCodeLine ("tax");
1549 AddCodeLine ("lda %s", lbuf);
1553 AddCodeLine ("clc");
1554 AddCodeLine ("adc %s", lbuf);
1555 AddCodeLine ("sta %s", lbuf);
1556 AddCodeLine ("txa");
1557 AddCodeLine ("adc %s+1", lbuf);
1558 AddCodeLine ("sta %s+1", lbuf);
1559 AddCodeLine ("tax");
1560 AddCodeLine ("lda %s", lbuf);
1565 if (flags & CF_CONST) {
1567 AddCodeLine ("ldy #<(%s)", lbuf);
1568 AddCodeLine ("sty ptr1");
1569 AddCodeLine ("ldy #>(%s+1)", lbuf);
1571 AddCodeLine ("jsr laddeq1");
1573 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1574 AddCodeLine ("jsr laddeqa");
1577 g_getstatic (flags, label, offs);
1579 g_putstatic (flags, label, offs);
1582 AddCodeLine ("ldy #<(%s)", lbuf);
1583 AddCodeLine ("sty ptr1");
1584 AddCodeLine ("ldy #>(%s+1)", lbuf);
1585 AddCodeLine ("jsr laddeq");
1596 void g_addeqlocal (unsigned flags, int offs, unsigned long val)
1597 /* Emit += for a local variable */
1599 /* Calculate the true offset, check it, load it into Y */
1601 CheckLocalOffs (offs);
1603 /* Check the size and determine operation */
1604 switch (flags & CF_TYPE) {
1607 if (flags & CF_FORCECHAR) {
1609 AddCodeLine ("ldx #$00");
1610 if (flags & CF_CONST) {
1611 AddCodeLine ("clc");
1612 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1613 AddCodeLine ("adc (sp),y");
1614 AddCodeLine ("sta (sp),y");
1616 AddCodeLine ("clc");
1617 AddCodeLine ("adc (sp),y");
1618 AddCodeLine ("sta (sp),y");
1620 if ((flags & CF_UNSIGNED) == 0) {
1621 unsigned L = GetLocalLabel();
1622 AddCodeLine ("bpl %s", LocalLabelName (L));
1623 AddCodeLine ("dex");
1632 if (flags & CF_CONST) {
1633 if (CodeSizeFactor >= 400) {
1634 AddCodeLine ("clc");
1635 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1636 AddCodeLine ("adc (sp),y");
1637 AddCodeLine ("sta (sp),y");
1638 AddCodeLine ("iny");
1639 AddCodeLine ("lda #$%02X", (int) ((val >> 8) & 0xFF));
1640 AddCodeLine ("adc (sp),y");
1641 AddCodeLine ("sta (sp),y");
1642 AddCodeLine ("tax");
1643 AddCodeLine ("dey");
1644 AddCodeLine ("lda (sp),y");
1646 g_getimmed (flags, val, 0);
1647 AddCodeLine ("jsr addeqysp");
1650 AddCodeLine ("jsr addeqysp");
1655 if (flags & CF_CONST) {
1656 g_getimmed (flags, val, 0);
1659 AddCodeLine ("jsr laddeqysp");
1669 void g_addeqind (unsigned flags, unsigned offs, unsigned long val)
1670 /* Emit += for the location with address in ax */
1672 /* If the offset is too large for a byte register, add the high byte
1673 * of the offset to the primary. Beware: We need a special correction
1674 * if the offset in the low byte will overflow in the operation.
1676 offs = MakeByteOffs (flags, offs);
1678 /* Check the size and determine operation */
1679 switch (flags & CF_TYPE) {
1682 AddCodeLine ("sta ptr1");
1683 AddCodeLine ("stx ptr1+1");
1684 AddCodeLine ("ldy #$%02X", offs);
1685 AddCodeLine ("ldx #$00");
1686 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1687 AddCodeLine ("clc");
1688 AddCodeLine ("adc (ptr1),y");
1689 AddCodeLine ("sta (ptr1),y");
1693 if (CodeSizeFactor >= 200) {
1694 /* Lots of code, use only if size is not important */
1695 AddCodeLine ("sta ptr1");
1696 AddCodeLine ("stx ptr1+1");
1697 AddCodeLine ("ldy #$%02X", offs);
1698 AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
1699 AddCodeLine ("clc");
1700 AddCodeLine ("adc (ptr1),y");
1701 AddCodeLine ("sta (ptr1),y");
1702 AddCodeLine ("pha");
1703 AddCodeLine ("iny");
1704 AddCodeLine ("lda #$%02X", (unsigned char)(val >> 8));
1705 AddCodeLine ("adc (ptr1),y");
1706 AddCodeLine ("sta (ptr1),y");
1707 AddCodeLine ("tax");
1708 AddCodeLine ("pla");
1714 AddCodeLine ("jsr pushax"); /* Push the address */
1715 push (CF_PTR); /* Correct the internal sp */
1716 g_getind (flags, offs); /* Fetch the value */
1717 g_inc (flags, val); /* Increment value in primary */
1718 g_putind (flags, offs); /* Store the value back */
1728 void g_subeqstatic (unsigned flags, unsigned long label, unsigned offs,
1730 /* Emit -= for a static variable */
1732 /* Create the correct label name */
1733 char* lbuf = GetLabelName (flags, label, offs);
1735 /* Check the size and determine operation */
1736 switch (flags & CF_TYPE) {
1739 if (flags & CF_FORCECHAR) {
1740 AddCodeLine ("ldx #$00");
1741 if (flags & CF_CONST) {
1743 AddCodeLine ("dec %s", lbuf);
1744 AddCodeLine ("lda %s", lbuf);
1746 AddCodeLine ("sec");
1747 AddCodeLine ("lda %s", lbuf);
1748 AddCodeLine ("sbc #$%02X", (int)(val & 0xFF));
1749 AddCodeLine ("sta %s", lbuf);
1752 AddCodeLine ("sec");
1753 AddCodeLine ("sta tmp1");
1754 AddCodeLine ("lda %s", lbuf);
1755 AddCodeLine ("sbc tmp1");
1756 AddCodeLine ("sta %s", lbuf);
1758 if ((flags & CF_UNSIGNED) == 0) {
1759 unsigned L = GetLocalLabel();
1760 AddCodeLine ("bpl %s", LocalLabelName (L));
1761 AddCodeLine ("dex");
1769 AddCodeLine ("sec");
1770 if (flags & CF_CONST) {
1771 AddCodeLine ("lda %s", lbuf);
1772 AddCodeLine ("sbc #$%02X", (unsigned char)val);
1773 AddCodeLine ("sta %s", lbuf);
1775 unsigned L = GetLocalLabel ();
1776 AddCodeLine ("bcs %s", LocalLabelName (L));
1777 AddCodeLine ("dec %s+1", lbuf);
1779 AddCodeLine ("ldx %s+1", lbuf);
1781 AddCodeLine ("lda %s+1", lbuf);
1782 AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
1783 AddCodeLine ("sta %s+1", lbuf);
1784 AddCodeLine ("tax");
1785 AddCodeLine ("lda %s", lbuf);
1788 AddCodeLine ("sta tmp1");
1789 AddCodeLine ("lda %s", lbuf);
1790 AddCodeLine ("sbc tmp1");
1791 AddCodeLine ("sta %s", lbuf);
1792 AddCodeLine ("stx tmp1");
1793 AddCodeLine ("lda %s+1", lbuf);
1794 AddCodeLine ("sbc tmp1");
1795 AddCodeLine ("sta %s+1", lbuf);
1796 AddCodeLine ("tax");
1797 AddCodeLine ("lda %s", lbuf);
1802 if (flags & CF_CONST) {
1804 AddCodeLine ("ldy #<(%s)", lbuf);
1805 AddCodeLine ("sty ptr1");
1806 AddCodeLine ("ldy #>(%s+1)", lbuf);
1807 AddCodeLine ("lda #$%02X", (unsigned char)val);
1808 AddCodeLine ("jsr lsubeqa");
1810 g_getstatic (flags, label, offs);
1812 g_putstatic (flags, label, offs);
1815 AddCodeLine ("ldy #<(%s)", lbuf);
1816 AddCodeLine ("sty ptr1");
1817 AddCodeLine ("ldy #>(%s+1)", lbuf);
1818 AddCodeLine ("jsr lsubeq");
1829 void g_subeqlocal (unsigned flags, int offs, unsigned long val)
1830 /* Emit -= for a local variable */
1832 /* Calculate the true offset, check it, load it into Y */
1834 CheckLocalOffs (offs);
1836 /* Check the size and determine operation */
1837 switch (flags & CF_TYPE) {
1840 if (flags & CF_FORCECHAR) {
1842 AddCodeLine ("ldx #$00");
1843 AddCodeLine ("sec");
1844 if (flags & CF_CONST) {
1845 AddCodeLine ("lda (sp),y");
1846 AddCodeLine ("sbc #$%02X", (unsigned char)val);
1848 AddCodeLine ("sta tmp1");
1849 AddCodeLine ("lda (sp),y");
1850 AddCodeLine ("sbc tmp1");
1852 AddCodeLine ("sta (sp),y");
1853 if ((flags & CF_UNSIGNED) == 0) {
1854 unsigned L = GetLocalLabel();
1855 AddCodeLine ("bpl %s", LocalLabelName (L));
1856 AddCodeLine ("dex");
1864 if (flags & CF_CONST) {
1865 g_getimmed (flags, val, 0);
1868 AddCodeLine ("jsr subeqysp");
1872 if (flags & CF_CONST) {
1873 g_getimmed (flags, val, 0);
1876 AddCodeLine ("jsr lsubeqysp");
1886 void g_subeqind (unsigned flags, unsigned offs, unsigned long val)
1887 /* Emit -= for the location with address in ax */
1889 /* If the offset is too large for a byte register, add the high byte
1890 * of the offset to the primary. Beware: We need a special correction
1891 * if the offset in the low byte will overflow in the operation.
1893 offs = MakeByteOffs (flags, offs);
1895 /* Check the size and determine operation */
1896 switch (flags & CF_TYPE) {
1899 AddCodeLine ("sta ptr1");
1900 AddCodeLine ("stx ptr1+1");
1901 AddCodeLine ("ldy #$%02X", offs);
1902 AddCodeLine ("ldx #$00");
1903 AddCodeLine ("lda (ptr1),y");
1904 AddCodeLine ("sec");
1905 AddCodeLine ("sbc #$%02X", (unsigned char)val);
1906 AddCodeLine ("sta (ptr1),y");
1910 if (CodeSizeFactor >= 200) {
1911 /* Lots of code, use only if size is not important */
1912 AddCodeLine ("sta ptr1");
1913 AddCodeLine ("stx ptr1+1");
1914 AddCodeLine ("ldy #$%02X", offs);
1915 AddCodeLine ("lda (ptr1),y");
1916 AddCodeLine ("sec");
1917 AddCodeLine ("sbc #$%02X", (unsigned char)val);
1918 AddCodeLine ("sta (ptr1),y");
1919 AddCodeLine ("pha");
1920 AddCodeLine ("iny");
1921 AddCodeLine ("lda (ptr1),y");
1922 AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
1923 AddCodeLine ("sta (ptr1),y");
1924 AddCodeLine ("tax");
1925 AddCodeLine ("pla");
1931 AddCodeLine ("jsr pushax"); /* Push the address */
1932 push (CF_PTR); /* Correct the internal sp */
1933 g_getind (flags, offs); /* Fetch the value */
1934 g_dec (flags, val); /* Increment value in primary */
1935 g_putind (flags, offs); /* Store the value back */
1945 /*****************************************************************************/
1946 /* Add a variable address to the value in ax */
1947 /*****************************************************************************/
1951 void g_addaddr_local (unsigned flags attribute ((unused)), int offs)
1952 /* Add the address of a local variable to ax */
1956 /* Add the offset */
1959 /* We cannot address more then 256 bytes of locals anyway */
1960 L = GetLocalLabel();
1961 CheckLocalOffs (offs);
1962 AddCodeLine ("clc");
1963 AddCodeLine ("adc #$%02X", offs & 0xFF);
1964 /* Do also skip the CLC insn below */
1965 AddCodeLine ("bcc %s", LocalLabelName (L));
1966 AddCodeLine ("inx");
1969 /* Add the current stackpointer value */
1970 AddCodeLine ("clc");
1972 /* Label was used above */
1975 AddCodeLine ("adc sp");
1976 AddCodeLine ("tay");
1977 AddCodeLine ("txa");
1978 AddCodeLine ("adc sp+1");
1979 AddCodeLine ("tax");
1980 AddCodeLine ("tya");
1985 void g_addaddr_static (unsigned flags, unsigned long label, unsigned offs)
1986 /* Add the address of a static variable to ax */
1988 /* Create the correct label name */
1989 char* lbuf = GetLabelName (flags, label, offs);
1991 /* Add the address to the current ax value */
1992 AddCodeLine ("clc");
1993 AddCodeLine ("adc #<(%s)", lbuf);
1994 AddCodeLine ("tay");
1995 AddCodeLine ("txa");
1996 AddCodeLine ("adc #>(%s)", lbuf);
1997 AddCodeLine ("tax");
1998 AddCodeLine ("tya");
2003 /*****************************************************************************/
2005 /*****************************************************************************/
2009 void g_save (unsigned flags)
2010 /* Copy primary register to hold register. */
2012 /* Check the size and determine operation */
2013 switch (flags & CF_TYPE) {
2016 if (flags & CF_FORCECHAR) {
2017 AddCodeLine ("pha");
2023 AddCodeLine ("sta regsave");
2024 AddCodeLine ("stx regsave+1");
2028 AddCodeLine ("jsr saveeax");
2038 void g_restore (unsigned flags)
2039 /* Copy hold register to primary. */
2041 /* Check the size and determine operation */
2042 switch (flags & CF_TYPE) {
2045 if (flags & CF_FORCECHAR) {
2046 AddCodeLine ("pla");
2052 AddCodeLine ("lda regsave");
2053 AddCodeLine ("ldx regsave+1");
2057 AddCodeLine ("jsr resteax");
2067 void g_cmp (unsigned flags, unsigned long val)
2068 /* Immidiate compare. The primary register will not be changed, Z flag
2074 /* Check the size and determine operation */
2075 switch (flags & CF_TYPE) {
2078 if (flags & CF_FORCECHAR) {
2079 AddCodeLine ("cmp #$%02X", (unsigned char)val);
2085 L = GetLocalLabel();
2086 AddCodeLine ("cmp #$%02X", (unsigned char)val);
2087 AddCodeLine ("bne %s", LocalLabelName (L));
2088 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
2093 Internal ("g_cmp: Long compares not implemented");
2103 static void oper (unsigned flags, unsigned long val, char** subs)
2104 /* Encode a binary operation. subs is a pointer to four groups of three
2106 * 0-2 --> Operate on ints
2107 * 3-5 --> Operate on unsigneds
2108 * 6-8 --> Operate on longs
2109 * 9-11 --> Operate on unsigned longs
2111 * The first subroutine names in each string group is used to encode an
2112 * operation with a zero constant, the second to encode an operation with
2113 * a 8 bit constant, and the third is used in all other cases.
2118 /* Determine the offset into the array */
2119 offs = (flags & CF_UNSIGNED)? 3 : 0;
2120 switch (flags & CF_TYPE) {
2133 /* Encode the operation */
2134 if (flags & CF_CONST) {
2135 /* Constant value given */
2136 if (val == 0 && subs [offs+0]) {
2137 /* Special case: constant with value zero */
2138 AddCodeLine ("jsr %s", subs [offs+0]);
2139 } else if (val < 0x100 && subs [offs+1]) {
2140 /* Special case: constant with high byte zero */
2141 ldaconst (val); /* Load low byte */
2142 AddCodeLine ("jsr %s", subs [offs+1]);
2144 /* Others: arbitrary constant value */
2145 g_getimmed (flags, val, 0); /* Load value */
2146 AddCodeLine ("jsr %s", subs [offs+2]);
2149 /* Value not constant (is already in (e)ax) */
2150 AddCodeLine ("jsr %s", subs [offs+2]);
2153 /* The operation will pop it's argument */
2159 void g_test (unsigned flags)
2160 /* Test the value in the primary and set the condition codes */
2162 switch (flags & CF_TYPE) {
2165 if (flags & CF_FORCECHAR) {
2166 AddCodeLine ("tax");
2172 AddCodeLine ("stx tmp1");
2173 AddCodeLine ("ora tmp1");
2177 if (flags & CF_UNSIGNED) {
2178 AddCodeLine ("jsr utsteax");
2180 AddCodeLine ("jsr tsteax");
2192 void g_push (unsigned flags, unsigned long val)
2193 /* Push the primary register or a constant value onto the stack */
2195 if (flags & CF_CONST && (flags & CF_TYPE) != CF_LONG) {
2197 /* We have a constant 8 or 16 bit value */
2198 if ((flags & CF_TYPE) == CF_CHAR && (flags & CF_FORCECHAR)) {
2200 /* Handle as 8 bit value */
2202 AddCodeLine ("jsr pusha");
2206 /* Handle as 16 bit value */
2207 g_getimmed (flags, val, 0);
2208 AddCodeLine ("jsr pushax");
2213 /* Value is not 16 bit or not constant */
2214 if (flags & CF_CONST) {
2215 /* Constant 32 bit value, load into eax */
2216 g_getimmed (flags, val, 0);
2219 /* Push the primary register */
2220 switch (flags & CF_TYPE) {
2223 if (flags & CF_FORCECHAR) {
2224 /* Handle as char */
2225 AddCodeLine ("jsr pusha");
2230 AddCodeLine ("jsr pushax");
2234 AddCodeLine ("jsr pusheax");
2244 /* Adjust the stack offset */
2250 void g_swap (unsigned flags)
2251 /* Swap the primary register and the top of the stack. flags give the type
2252 * of *both* values (must have same size).
2255 switch (flags & CF_TYPE) {
2259 AddCodeLine ("jsr swapstk");
2263 AddCodeLine ("jsr swapestk");
2274 void g_call (unsigned Flags, const char* Label, unsigned ArgSize)
2275 /* Call the specified subroutine name */
2277 if ((Flags & CF_FIXARGC) == 0) {
2278 /* Pass the argument count */
2281 AddCodeLine ("jsr _%s", Label);
2282 oursp += ArgSize; /* callee pops args */
2287 void g_callind (unsigned Flags, unsigned ArgSize, int Offs)
2288 /* Call subroutine indirect */
2290 if ((Flags & CF_LOCAL) == 0) {
2291 /* Address is in a/x */
2292 if ((Flags & CF_FIXARGC) == 0) {
2293 /* Pass arg count */
2296 AddCodeLine ("jsr callax");
2298 /* The address is on stack, offset is on Val */
2300 CheckLocalOffs (Offs);
2301 AddCodeLine ("pha");
2302 AddCodeLine ("ldy #$%02X", Offs);
2303 AddCodeLine ("lda (sp),y");
2304 AddCodeLine ("sta jmpvec+1");
2305 AddCodeLine ("iny");
2306 AddCodeLine ("lda (sp),y");
2307 AddCodeLine ("sta jmpvec+2");
2308 AddCodeLine ("pla");
2309 AddCodeLine ("jsr jmpvec");
2312 /* Callee pops args */
2318 void g_jump (unsigned Label)
2319 /* Jump to specified internal label number */
2321 AddCodeLine ("jmp %s", LocalLabelName (Label));
2326 void g_truejump (unsigned flags attribute ((unused)), unsigned label)
2327 /* Jump to label if zero flag clear */
2329 AddCodeLine ("jne %s", LocalLabelName (label));
2334 void g_falsejump (unsigned flags attribute ((unused)), unsigned label)
2335 /* Jump to label if zero flag set */
2337 AddCodeLine ("jeq %s", LocalLabelName (label));
2342 static void mod_internal (int k, char* verb1, char* verb2)
2345 AddCodeLine ("jsr %ssp%c", verb1, k + '0');
2349 AddCodeLine ("jsr %ssp", verb2);
2355 void g_space (int space)
2356 /* Create or drop space on the stack */
2359 mod_internal (-space, "inc", "addy");
2360 } else if (space > 0) {
2361 mod_internal (space, "dec", "suby");
2367 void g_cstackcheck (void)
2368 /* Check for a C stack overflow */
2370 AddCodeLine ("jsr cstkchk");
2375 void g_stackcheck (void)
2376 /* Check for a stack overflow */
2378 AddCodeLine ("jsr stkchk");
2383 void g_add (unsigned flags, unsigned long val)
2384 /* Primary = TOS + Primary */
2386 static char* ops [12] = {
2387 0, "tosadda0", "tosaddax",
2388 0, "tosadda0", "tosaddax",
2393 if (flags & CF_CONST) {
2394 flags &= ~CF_FORCECHAR; /* Handle chars as ints */
2395 g_push (flags & ~CF_CONST, 0);
2397 oper (flags, val, ops);
2402 void g_sub (unsigned flags, unsigned long val)
2403 /* Primary = TOS - Primary */
2405 static char* ops [12] = {
2406 0, "tossuba0", "tossubax",
2407 0, "tossuba0", "tossubax",
2412 if (flags & CF_CONST) {
2413 flags &= ~CF_FORCECHAR; /* Handle chars as ints */
2414 g_push (flags & ~CF_CONST, 0);
2416 oper (flags, val, ops);
2421 void g_rsub (unsigned flags, unsigned long val)
2422 /* Primary = Primary - TOS */
2424 static char* ops [12] = {
2425 0, "tosrsuba0", "tosrsubax",
2426 0, "tosrsuba0", "tosrsubax",
2430 oper (flags, val, ops);
2435 void g_mul (unsigned flags, unsigned long val)
2436 /* Primary = TOS * Primary */
2438 static char* ops [12] = {
2439 0, "tosmula0", "tosmulax",
2440 0, "tosumula0", "tosumulax",
2447 /* Do strength reduction if the value is constant and a power of two */
2448 if (flags & CF_CONST && (p2 = powerof2 (val)) >= 0) {
2449 /* Generate a shift instead */
2454 /* If the right hand side is const, the lhs is not on stack but still
2455 * in the primary register.
2457 if (flags & CF_CONST) {
2459 switch (flags & CF_TYPE) {
2462 if (flags & CF_FORCECHAR) {
2463 /* Handle some special cases */
2467 AddCodeLine ("sta tmp1");
2468 AddCodeLine ("asl a");
2469 AddCodeLine ("clc");
2470 AddCodeLine ("adc tmp1");
2474 AddCodeLine ("sta tmp1");
2475 AddCodeLine ("asl a");
2476 AddCodeLine ("asl a");
2477 AddCodeLine ("clc");
2478 AddCodeLine ("adc tmp1");
2482 AddCodeLine ("sta tmp1");
2483 AddCodeLine ("asl a");
2484 AddCodeLine ("asl a");
2485 AddCodeLine ("clc");
2486 AddCodeLine ("adc tmp1");
2487 AddCodeLine ("asl a");
2496 AddCodeLine ("jsr mulax3");
2499 AddCodeLine ("jsr mulax5");
2502 AddCodeLine ("jsr mulax10");
2514 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2515 * into the normal, non-optimized stuff.
2517 flags &= ~CF_FORCECHAR; /* Handle chars as ints */
2518 g_push (flags & ~CF_CONST, 0);
2522 /* Use long way over the stack */
2523 oper (flags, val, ops);
2528 void g_div (unsigned flags, unsigned long val)
2529 /* Primary = TOS / Primary */
2531 static char* ops [12] = {
2532 0, "tosdiva0", "tosdivax",
2533 0, "tosudiva0", "tosudivax",
2538 /* Do strength reduction if the value is constant and a power of two */
2540 if ((flags & CF_CONST) && (p2 = powerof2 (val)) >= 0) {
2541 /* Generate a shift instead */
2544 /* Generate a division */
2545 if (flags & CF_CONST) {
2546 /* lhs is not on stack */
2547 flags &= ~CF_FORCECHAR; /* Handle chars as ints */
2548 g_push (flags & ~CF_CONST, 0);
2550 oper (flags, val, ops);
2556 void g_mod (unsigned flags, unsigned long val)
2557 /* Primary = TOS % Primary */
2559 static char* ops [12] = {
2560 0, "tosmoda0", "tosmodax",
2561 0, "tosumoda0", "tosumodax",
2567 /* Check if we can do some cost reduction */
2568 if ((flags & CF_CONST) && (flags & CF_UNSIGNED) && val != 0xFFFFFFFF && (p2 = powerof2 (val)) >= 0) {
2569 /* We can do that with an AND operation */
2570 g_and (flags, val - 1);
2572 /* Do it the hard way... */
2573 if (flags & CF_CONST) {
2574 /* lhs is not on stack */
2575 flags &= ~CF_FORCECHAR; /* Handle chars as ints */
2576 g_push (flags & ~CF_CONST, 0);
2578 oper (flags, val, ops);
2584 void g_or (unsigned flags, unsigned long val)
2585 /* Primary = TOS | Primary */
2587 static char* ops [12] = {
2588 0, "tosora0", "tosorax",
2589 0, "tosora0", "tosorax",
2594 /* If the right hand side is const, the lhs is not on stack but still
2595 * in the primary register.
2597 if (flags & CF_CONST) {
2599 switch (flags & CF_TYPE) {
2602 if (flags & CF_FORCECHAR) {
2603 if ((val & 0xFF) != 0xFF) {
2604 AddCodeLine ("ora #$%02X", (unsigned char)val);
2612 AddCodeLine ("ora #$%02X", (unsigned char)val);
2619 AddCodeLine ("ora #$%02X", (unsigned char)val);
2628 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2629 * into the normal, non-optimized stuff.
2631 g_push (flags & ~CF_CONST, 0);
2635 /* Use long way over the stack */
2636 oper (flags, val, ops);
2641 void g_xor (unsigned flags, unsigned long val)
2642 /* Primary = TOS ^ Primary */
2644 static char* ops [12] = {
2645 0, "tosxora0", "tosxorax",
2646 0, "tosxora0", "tosxorax",
2652 /* If the right hand side is const, the lhs is not on stack but still
2653 * in the primary register.
2655 if (flags & CF_CONST) {
2657 switch (flags & CF_TYPE) {
2660 if (flags & CF_FORCECHAR) {
2661 if ((val & 0xFF) != 0) {
2662 AddCodeLine ("eor #$%02X", (unsigned char)val);
2671 AddCodeLine ("eor #$%02X", (unsigned char)val);
2674 } else if ((val & 0xFF) == 0) {
2675 AddCodeLine ("pha");
2676 AddCodeLine ("txa");
2677 AddCodeLine ("eor #$%02X", (unsigned char)(val >> 8));
2678 AddCodeLine ("tax");
2679 AddCodeLine ("pla");
2687 AddCodeLine ("eor #$%02X", (unsigned char)val);
2697 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2698 * into the normal, non-optimized stuff.
2700 g_push (flags & ~CF_CONST, 0);
2704 /* Use long way over the stack */
2705 oper (flags, val, ops);
2710 void g_and (unsigned flags, unsigned long val)
2711 /* Primary = TOS & Primary */
2713 static char* ops [12] = {
2714 0, "tosanda0", "tosandax",
2715 0, "tosanda0", "tosandax",
2720 /* If the right hand side is const, the lhs is not on stack but still
2721 * in the primary register.
2723 if (flags & CF_CONST) {
2725 switch (flags & CF_TYPE) {
2728 if (flags & CF_FORCECHAR) {
2729 AddCodeLine ("and #$%02X", (unsigned char)val);
2734 if ((val & 0xFFFF) != 0xFFFF) {
2739 } else if (val != 0xFF) {
2740 AddCodeLine ("and #$%02X", (unsigned char)val);
2742 } else if ((val & 0xFF00) == 0xFF00) {
2743 AddCodeLine ("and #$%02X", (unsigned char)val);
2744 } else if ((val & 0x00FF) == 0x0000) {
2745 AddCodeLine ("txa");
2746 AddCodeLine ("and #$%02X", (unsigned char)(val >> 8));
2747 AddCodeLine ("tax");
2750 AddCodeLine ("tay");
2751 AddCodeLine ("txa");
2752 AddCodeLine ("and #$%02X", (unsigned char)(val >> 8));
2753 AddCodeLine ("tax");
2754 AddCodeLine ("tya");
2755 if ((val & 0x00FF) != 0x00FF) {
2756 AddCodeLine ("and #$%02X", (unsigned char)val);
2765 AddCodeLine ("stx sreg+1");
2766 AddCodeLine ("stx sreg");
2767 if ((val & 0xFF) != 0xFF) {
2768 AddCodeLine ("and #$%02X", (unsigned char)val);
2771 } else if (val == 0xFF00) {
2773 AddCodeLine ("sta sreg+1");
2774 AddCodeLine ("sta sreg");
2783 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2784 * into the normal, non-optimized stuff.
2786 g_push (flags & ~CF_CONST, 0);
2790 /* Use long way over the stack */
2791 oper (flags, val, ops);
2796 void g_asr (unsigned flags, unsigned long val)
2797 /* Primary = TOS >> Primary */
2799 static char* ops [12] = {
2800 0, "tosasra0", "tosasrax",
2801 0, "tosshra0", "tosshrax",
2806 /* If the right hand side is const, the lhs is not on stack but still
2807 * in the primary register.
2809 if (flags & CF_CONST) {
2811 switch (flags & CF_TYPE) {
2815 if (val >= 8 && (flags & CF_UNSIGNED)) {
2816 AddCodeLine ("txa");
2823 } else if (val >= 1 && val <= 4) {
2824 if (flags & CF_UNSIGNED) {
2825 AddCodeLine ("jsr shrax%ld", val);
2827 AddCodeLine ("jsr asrax%ld", val);
2837 } else if (val >= 1 && val <= 4) {
2838 if (flags & CF_UNSIGNED) {
2839 AddCodeLine ("jsr shreax%ld", val);
2841 AddCodeLine ("jsr asreax%ld", val);
2844 } else if (val == 8 && (flags & CF_UNSIGNED)) {
2845 AddCodeLine ("txa");
2846 AddCodeLine ("ldx sreg");
2847 AddCodeLine ("ldy sreg+1");
2848 AddCodeLine ("sty sreg");
2849 AddCodeLine ("ldy #$00");
2850 AddCodeLine ("sty sreg+1");
2852 } else if (val == 16) {
2853 AddCodeLine ("ldy #$00");
2854 AddCodeLine ("ldx sreg+1");
2855 if ((flags & CF_UNSIGNED) == 0) {
2856 unsigned L = GetLocalLabel();
2857 AddCodeLine ("bpl %s", LocalLabelName (L));
2858 AddCodeLine ("dey");
2861 AddCodeLine ("lda sreg");
2862 AddCodeLine ("sty sreg+1");
2863 AddCodeLine ("sty sreg");
2872 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2873 * into the normal, non-optimized stuff.
2875 g_push (flags & ~CF_CONST, 0);
2879 /* Use long way over the stack */
2880 oper (flags, val, ops);
2885 void g_asl (unsigned flags, unsigned long val)
2886 /* Primary = TOS << Primary */
2888 static char* ops [12] = {
2889 0, "tosasla0", "tosaslax",
2890 0, "tosshla0", "tosshlax",
2896 /* If the right hand side is const, the lhs is not on stack but still
2897 * in the primary register.
2899 if (flags & CF_CONST) {
2901 switch (flags & CF_TYPE) {
2906 AddCodeLine ("tax");
2907 AddCodeLine ("lda #$00");
2913 } else if (val >= 1 && val <= 4) {
2914 if (flags & CF_UNSIGNED) {
2915 AddCodeLine ("jsr shlax%ld", val);
2917 AddCodeLine ("jsr aslax%ld", val);
2927 } else if (val >= 1 && val <= 4) {
2928 if (flags & CF_UNSIGNED) {
2929 AddCodeLine ("jsr shleax%ld", val);
2931 AddCodeLine ("jsr asleax%ld", val);
2934 } else if (val == 8) {
2935 AddCodeLine ("ldy sreg");
2936 AddCodeLine ("sty sreg+1");
2937 AddCodeLine ("stx sreg");
2938 AddCodeLine ("tax");
2939 AddCodeLine ("lda #$00");
2941 } else if (val == 16) {
2942 AddCodeLine ("stx sreg+1");
2943 AddCodeLine ("sta sreg");
2944 AddCodeLine ("lda #$00");
2945 AddCodeLine ("tax");
2954 /* If we go here, we didn't emit code. Push the lhs on stack and fall
2955 * into the normal, non-optimized stuff.
2957 g_push (flags & ~CF_CONST, 0);
2961 /* Use long way over the stack */
2962 oper (flags, val, ops);
2967 void g_neg (unsigned flags)
2968 /* Primary = -Primary */
2970 switch (flags & CF_TYPE) {
2974 AddCodeLine ("jsr negax");
2978 AddCodeLine ("jsr negeax");
2988 void g_bneg (unsigned flags)
2989 /* Primary = !Primary */
2991 switch (flags & CF_TYPE) {
2994 AddCodeLine ("jsr bnega");
2998 AddCodeLine ("jsr bnegax");
3002 AddCodeLine ("jsr bnegeax");
3012 void g_com (unsigned flags)
3013 /* Primary = ~Primary */
3015 switch (flags & CF_TYPE) {
3019 AddCodeLine ("jsr complax");
3023 AddCodeLine ("jsr compleax");
3033 void g_inc (unsigned flags, unsigned long val)
3034 /* Increment the primary register by a given number */
3036 /* Don't inc by zero */
3041 /* Generate code for the supported types */
3043 switch (flags & CF_TYPE) {
3046 if (flags & CF_FORCECHAR) {
3047 if (CPU == CPU_65C02 && val <= 2) {
3049 AddCodeLine ("ina");
3052 AddCodeLine ("clc");
3053 AddCodeLine ("adc #$%02X", (unsigned char)val);
3060 if (CPU == CPU_65C02 && val == 1) {
3061 unsigned L = GetLocalLabel();
3062 AddCodeLine ("ina");
3063 AddCodeLine ("bne %s", LocalLabelName (L));
3064 AddCodeLine ("inx");
3066 } else if (CodeSizeFactor < 200) {
3069 AddCodeLine ("jsr incax%lu", val);
3070 } else if (val <= 255) {
3072 AddCodeLine ("jsr incaxy");
3074 g_add (flags | CF_CONST, val);
3077 /* Inline the code */
3079 if ((val & 0xFF) != 0) {
3080 unsigned L = GetLocalLabel();
3081 AddCodeLine ("clc");
3082 AddCodeLine ("adc #$%02X", (unsigned char) val);
3083 AddCodeLine ("bcc %s", LocalLabelName (L));
3084 AddCodeLine ("inx");
3088 AddCodeLine ("inx");
3091 AddCodeLine ("inx");
3094 AddCodeLine ("inx");
3097 AddCodeLine ("clc");
3098 if ((val & 0xFF) != 0) {
3099 AddCodeLine ("adc #$%02X", (unsigned char) val);
3101 AddCodeLine ("pha");
3102 AddCodeLine ("txa");
3103 AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
3104 AddCodeLine ("tax");
3105 AddCodeLine ("pla");
3113 AddCodeLine ("jsr inceaxy");
3115 g_add (flags | CF_CONST, val);
3127 void g_dec (unsigned flags, unsigned long val)
3128 /* Decrement the primary register by a given number */
3130 /* Don't dec by zero */
3135 /* Generate code for the supported types */
3137 switch (flags & CF_TYPE) {
3140 if (flags & CF_FORCECHAR) {
3141 if (CPU == CPU_65C02 && val <= 2) {
3143 AddCodeLine ("dea");
3146 AddCodeLine ("sec");
3147 AddCodeLine ("sbc #$%02X", (unsigned char)val);
3154 if (CodeSizeFactor < 200) {
3155 /* Use subroutines */
3157 AddCodeLine ("jsr decax%d", (int) val);
3158 } else if (val <= 255) {
3160 AddCodeLine ("jsr decaxy");
3162 g_sub (flags | CF_CONST, val);
3165 /* Inline the code */
3167 if ((val & 0xFF) != 0) {
3168 unsigned L = GetLocalLabel();
3169 AddCodeLine ("sec");
3170 AddCodeLine ("sbc #$%02X", (unsigned char) val);
3171 AddCodeLine ("bcs %s", LocalLabelName (L));
3172 AddCodeLine ("dex");
3176 AddCodeLine ("dex");
3179 AddCodeLine ("dex");
3182 AddCodeLine ("sec");
3183 if ((val & 0xFF) != 0) {
3184 AddCodeLine ("sbc #$%02X", (unsigned char) val);
3186 AddCodeLine ("pha");
3187 AddCodeLine ("txa");
3188 AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
3189 AddCodeLine ("tax");
3190 AddCodeLine ("pla");
3198 AddCodeLine ("jsr deceaxy");
3200 g_sub (flags | CF_CONST, val);
3213 * Following are the conditional operators. They compare the TOS against
3214 * the primary and put a literal 1 in the primary if the condition is
3215 * true, otherwise they clear the primary register
3220 void g_eq (unsigned flags, unsigned long val)
3221 /* Test for equal */
3223 static char* ops [12] = {
3224 "toseq00", "toseqa0", "toseqax",
3225 "toseq00", "toseqa0", "toseqax",
3232 /* If the right hand side is const, the lhs is not on stack but still
3233 * in the primary register.
3235 if (flags & CF_CONST) {
3237 switch (flags & CF_TYPE) {
3240 if (flags & CF_FORCECHAR) {
3241 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3242 AddCodeLine ("jsr booleq");
3248 L = GetLocalLabel();
3249 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3250 AddCodeLine ("bne %s", LocalLabelName (L));
3251 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3253 AddCodeLine ("jsr booleq");
3263 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3264 * into the normal, non-optimized stuff.
3266 g_push (flags & ~CF_CONST, 0);
3270 /* Use long way over the stack */
3271 oper (flags, val, ops);
3276 void g_ne (unsigned flags, unsigned long val)
3277 /* Test for not equal */
3279 static char* ops [12] = {
3280 "tosne00", "tosnea0", "tosneax",
3281 "tosne00", "tosnea0", "tosneax",
3288 /* If the right hand side is const, the lhs is not on stack but still
3289 * in the primary register.
3291 if (flags & CF_CONST) {
3293 switch (flags & CF_TYPE) {
3296 if (flags & CF_FORCECHAR) {
3297 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3298 AddCodeLine ("jsr boolne");
3304 L = GetLocalLabel();
3305 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3306 AddCodeLine ("bne %s", LocalLabelName (L));
3307 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3309 AddCodeLine ("jsr boolne");
3319 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3320 * into the normal, non-optimized stuff.
3322 g_push (flags & ~CF_CONST, 0);
3326 /* Use long way over the stack */
3327 oper (flags, val, ops);
3332 void g_lt (unsigned flags, unsigned long val)
3333 /* Test for less than */
3335 static char* ops [12] = {
3336 "toslt00", "toslta0", "tosltax",
3337 "tosult00", "tosulta0", "tosultax",
3342 /* If the right hand side is const, the lhs is not on stack but still
3343 * in the primary register.
3345 if (flags & CF_CONST) {
3347 /* Give a warning in some special cases */
3348 if ((flags & CF_UNSIGNED) && val == 0) {
3349 Warning ("Condition is never true");
3352 /* Look at the type */
3353 switch (flags & CF_TYPE) {
3356 if (flags & CF_FORCECHAR) {
3357 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3358 if (flags & CF_UNSIGNED) {
3359 AddCodeLine ("jsr boolult");
3361 AddCodeLine ("jsr boollt");
3368 if ((flags & CF_UNSIGNED) == 0 && val == 0) {
3369 /* If we have a signed compare against zero, we only need to
3370 * test the high byte.
3372 AddCodeLine ("txa");
3373 AddCodeLine ("jsr boollt");
3376 /* Direct code only for unsigned data types */
3377 if (flags & CF_UNSIGNED) {
3378 unsigned L = GetLocalLabel();
3379 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3380 AddCodeLine ("bne %s", LocalLabelName (L));
3381 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3383 AddCodeLine ("jsr boolult");
3389 if ((flags & CF_UNSIGNED) == 0 && val == 0) {
3390 /* If we have a signed compare against zero, we only need to
3391 * test the high byte.
3393 AddCodeLine ("lda sreg+1");
3394 AddCodeLine ("jsr boollt");
3403 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3404 * into the normal, non-optimized stuff.
3406 g_push (flags & ~CF_CONST, 0);
3410 /* Use long way over the stack */
3411 oper (flags, val, ops);
3416 void g_le (unsigned flags, unsigned long val)
3417 /* Test for less than or equal to */
3419 static char* ops [12] = {
3420 "tosle00", "toslea0", "tosleax",
3421 "tosule00", "tosulea0", "tosuleax",
3427 /* If the right hand side is const, the lhs is not on stack but still
3428 * in the primary register.
3430 if (flags & CF_CONST) {
3432 /* <= is not very effective on the 6502, so try to convert
3433 * it into < if the value is in a valid range.
3436 /* Look at the type */
3437 switch (flags & CF_TYPE) {
3440 if (flags & CF_FORCECHAR) {
3441 if (flags & CF_UNSIGNED) {
3443 AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
3444 AddCodeLine ("jsr boolult");
3446 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3447 AddCodeLine ("jsr boolule");
3451 AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
3452 AddCodeLine ("jsr boollt");
3454 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3455 AddCodeLine ("jsr boolle");
3463 if (flags & CF_UNSIGNED) {
3464 unsigned L = GetLocalLabel();
3465 const char* Name = "boolule";
3470 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3471 AddCodeLine ("bne %s", LocalLabelName (L));
3472 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3474 AddCodeLine ("jsr %s", Name);
3486 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3487 * into the normal, non-optimized stuff.
3489 g_push (flags & ~CF_CONST, 0);
3493 /* Use long way over the stack */
3494 oper (flags, val, ops);
3499 void g_gt (unsigned flags, unsigned long val)
3500 /* Test for greater than */
3502 static char* ops [12] = {
3503 "tosgt00", "tosgta0", "tosgtax",
3504 "tosugt00", "tosugta0", "tosugtax",
3510 /* If the right hand side is const, the lhs is not on stack but still
3511 * in the primary register.
3513 if (flags & CF_CONST) {
3515 /* > is not very effective on the 6502, so try to convert
3516 * it into >= if the value is in a valid range.
3519 /* Look at the type */
3520 switch (flags & CF_TYPE) {
3523 if (flags & CF_FORCECHAR) {
3524 if (flags & CF_UNSIGNED) {
3525 /* If we have a compare > 0, we will replace it by
3526 * != 0 here, since both are identical but the latter
3527 * is easier to optimize.
3530 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3531 AddCodeLine ("jsr boolne");
3532 } else if (val < 255) {
3533 AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
3534 AddCodeLine ("jsr booluge");
3536 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3537 AddCodeLine ("jsr boolugt");
3541 AddCodeLine ("cmp #$%02X", (unsigned char)val+1);
3542 AddCodeLine ("jsr boolge");
3544 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3545 AddCodeLine ("jsr boolgt");
3553 if (flags & CF_UNSIGNED) {
3554 /* If we have a compare > 0, we will replace it by
3555 * != 0 here, since both are identical but the latter
3556 * is easier to optimize.
3559 AddCodeLine ("stx tmp1");
3560 AddCodeLine ("ora tmp1");
3561 AddCodeLine ("jsr boolne");
3563 unsigned L = GetLocalLabel();
3564 const char* Name = "boolugt";
3569 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3570 AddCodeLine ("bne %s", LocalLabelName (L));
3571 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3573 AddCodeLine ("jsr %s", Name);
3586 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3587 * into the normal, non-optimized stuff.
3589 g_push (flags & ~CF_CONST, 0);
3593 /* Use long way over the stack */
3594 oper (flags, val, ops);
3599 void g_ge (unsigned flags, unsigned long val)
3600 /* Test for greater than or equal to */
3602 static char* ops [12] = {
3603 "tosge00", "tosgea0", "tosgeax",
3604 "tosuge00", "tosugea0", "tosugeax",
3610 /* If the right hand side is const, the lhs is not on stack but still
3611 * in the primary register.
3613 if (flags & CF_CONST) {
3615 /* Give a warning in some special cases */
3616 if ((flags & CF_UNSIGNED) && val == 0) {
3617 Warning ("Condition is always true");
3620 /* Look at the type */
3621 switch (flags & CF_TYPE) {
3624 if (flags & CF_FORCECHAR) {
3625 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3626 if (flags & CF_UNSIGNED) {
3627 AddCodeLine ("jsr booluge");
3629 AddCodeLine ("jsr boolge");
3636 if ((flags & CF_UNSIGNED) == 0 && val == 0) {
3637 /* If we have a signed compare against zero, we only need to
3638 * test the high byte.
3640 AddCodeLine ("txa");
3641 AddCodeLine ("jsr boolge");
3644 /* Direct code only for unsigned data types */
3645 if (flags & CF_UNSIGNED) {
3646 unsigned L = GetLocalLabel();
3647 AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
3648 AddCodeLine ("bne %s", LocalLabelName (L));
3649 AddCodeLine ("cmp #$%02X", (unsigned char)val);
3651 AddCodeLine ("jsr booluge");
3657 if ((flags & CF_UNSIGNED) == 0 && val == 0) {
3658 /* If we have a signed compare against zero, we only need to
3659 * test the high byte.
3661 AddCodeLine ("lda sreg+1");
3662 AddCodeLine ("jsr boolge");
3671 /* If we go here, we didn't emit code. Push the lhs on stack and fall
3672 * into the normal, non-optimized stuff.
3674 g_push (flags & ~CF_CONST, 0);
3678 /* Use long way over the stack */
3679 oper (flags, val, ops);
3684 /*****************************************************************************/
3685 /* Allocating static storage */
3686 /*****************************************************************************/
3690 void g_res (unsigned n)
3691 /* Reserve static storage, n bytes */
3693 AddDataLine ("\t.res\t%u,$00", n);
3698 void g_defdata (unsigned flags, unsigned long val, unsigned offs)
3699 /* Define data with the size given in flags */
3701 if (flags & CF_CONST) {
3703 /* Numeric constant */
3704 switch (flags & CF_TYPE) {
3707 AddDataLine ("\t.byte\t$%02lX", val & 0xFF);
3711 AddDataLine ("\t.word\t$%04lX", val & 0xFFFF);
3715 AddDataLine ("\t.dword\t$%08lX", val & 0xFFFFFFFF);
3726 /* Create the correct label name */
3727 const char* Label = GetLabelName (flags, val, offs);
3729 /* Labels are always 16 bit */
3730 AddDataLine ("\t.addr\t%s", Label);
3737 void g_defbytes (const void* Bytes, unsigned Count)
3738 /* Output a row of bytes as a constant */
3744 /* Cast the buffer pointer */
3745 const unsigned char* Data = (const unsigned char*) Bytes;
3747 /* Output the stuff */
3750 /* How many go into this line? */
3751 if ((Chunk = Count) > 16) {
3756 /* Output one line */
3757 strcpy (Buf, "\t.byte\t");
3760 B += sprintf (B, "$%02X", *Data++);
3766 /* Output the line */
3773 void g_zerobytes (unsigned n)
3774 /* Output n bytes of data initialized with zero */
3776 AddDataLine ("\t.res\t%u,$00", n);
3781 /*****************************************************************************/
3782 /* Switch statement */
3783 /*****************************************************************************/
3787 void g_switch (Collection* Nodes, unsigned DefaultLabel, unsigned Depth)
3788 /* Generate code for a switch statement */
3790 unsigned NextLabel = 0;
3793 /* Setup registers and determine which compare insn to use */
3794 const char* Compare;
3797 Compare = "cmp #$%02X";
3800 Compare = "cpx #$%02X";
3803 AddCodeLine ("ldy sreg");
3804 Compare = "cpy #$%02X";
3807 AddCodeLine ("ldy sreg+1");
3808 Compare = "cpy #$%02X";
3811 Internal ("Invalid depth in g_switch: %u", Depth);
3814 /* Walk over all nodes */
3815 for (I = 0; I < CollCount (Nodes); ++I) {
3817 /* Get the next case node */
3818 CaseNode* N = CollAtUnchecked (Nodes, I);
3820 /* If we have a next label, define it */
3822 g_defcodelabel (NextLabel);
3826 /* Do the compare */
3827 AddCodeLine (Compare, CN_GetValue (N));
3829 /* If this is the last level, jump directly to the case code if found */
3832 /* Branch if equal */
3833 g_falsejump (0, CN_GetLabel (N));
3837 /* Determine the next label */
3838 if (I == CollCount (Nodes) - 1) {
3839 /* Last node means not found */
3840 g_truejump (0, DefaultLabel);
3842 /* Jump to the next check */
3843 NextLabel = GetLocalLabel ();
3844 g_truejump (0, NextLabel);
3847 /* Check the next level */
3848 g_switch (N->Nodes, DefaultLabel, Depth-1);
3853 /* If we go here, we haven't found the label */
3854 g_jump (DefaultLabel);
3859 /*****************************************************************************/
3860 /* User supplied assembler code */
3861 /*****************************************************************************/
3865 void g_asmcode (struct StrBuf* B)
3866 /* Output one line of assembler code. */
3868 AddCodeLine ("%.*s", SB_GetLen (B), SB_GetConstBuf (B));
3873 /*****************************************************************************/
3874 /* Inlined known functions */
3875 /*****************************************************************************/
3879 void g_strlen (unsigned flags, unsigned long val, unsigned offs)
3880 /* Inline the strlen() function */
3882 /* We need a label in both cases */
3883 unsigned label = GetLocalLabel ();
3885 /* Two different encodings */
3886 if (flags & CF_CONST) {
3888 /* The address of the string is constant. Create the correct label name */
3889 char* lbuf = GetLabelName (flags, val, offs);
3891 /* Generate the strlen code */
3892 AddCodeLine ("ldy #$FF");
3893 g_defcodelabel (label);
3894 AddCodeLine ("iny");
3895 AddCodeLine ("lda %s,y", lbuf);
3896 AddCodeLine ("bne %s", LocalLabelName (label));
3897 AddCodeLine ("tax");
3898 AddCodeLine ("tya");
3902 /* Address not constant but in primary */
3903 if (CodeSizeFactor < 400) {
3904 /* This is too much code, so call strlen instead of inlining */
3905 AddCodeLine ("jsr _strlen");
3907 /* Inline the function */
3908 AddCodeLine ("sta ptr1");
3909 AddCodeLine ("stx ptr1+1");
3910 AddCodeLine ("ldy #$FF");
3911 g_defcodelabel (label);
3912 AddCodeLine ("iny");
3913 AddCodeLine ("lda (ptr1),y");
3914 AddCodeLine ("bne %s", LocalLabelName (label));
3915 AddCodeLine ("tax");
3916 AddCodeLine ("tya");