git.sur5r.net Git - cc65/blob - src/cc65/codeent.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 codeent.c                                 */
   4 /*                                                                           */
   5 /*                            Code segment entry                             */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2001-2003 Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 52                                             */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  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.                                    */
  18 /*                                                                           */
  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:                            */
  22 /*                                                                           */
  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              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 /* common */
  40 #include "chartype.h"
  41 #include "check.h"
  42 #include "debugflag.h"
  43 #include "xmalloc.h"
  44 #include "xsprintf.h"
  45
  46 /* cc65 */
  47 #include "codeinfo.h"
  48 #include "error.h"
  49 #include "global.h"
  50 #include "codelab.h"
  51 #include "opcodes.h"
  52 #include "codeent.h"
  53
  54
  55
  56 /*****************************************************************************/
  57 /*                                   Data                                    */
  58 /*****************************************************************************/
  59
  60
  61
  62 /* Empty argument */
  63 static char EmptyArg[] = "";
  64
  65
  66
  67 /*****************************************************************************/
  68 /*                             Helper functions                              */
  69 /*****************************************************************************/
  70
  71
  72
  73 static void FreeArg (char* Arg)
  74 /* Free a code entry argument */
  75 {
  76     if (Arg != EmptyArg) {
  77         xfree (Arg);
  78     }
  79 }
  80
  81
  82
  83 static char* GetArgCopy (const char* Arg)
  84 /* Create an argument copy for assignment */
  85 {
  86     if (Arg && Arg[0] != '\0') {
  87         /* Create a copy */
  88         return xstrdup (Arg);
  89     } else {
  90         /* Use the empty argument string */
  91         return EmptyArg;
  92     }
  93 }
  94
  95
  96
  97 static int NumArg (const char* Arg, unsigned long* Num)
  98 /* If the given argument is numerical, convert it and return true. Otherwise
  99  * set Num to zero and return false.
 100  */
 101 {
 102     char* End;
 103     unsigned long Val;
 104
 105     /* Determine the base */
 106     int Base = 10;
 107     if (*Arg == '$') {
 108         ++Arg;
 109         Base = 16;
 110     } else if (*Arg == '%') {
 111         ++Arg;
 112         Base = 2;
 113     }
 114
 115     /* Convert the value. strtol is not exactly what we want here, but it's
 116      * cheap and may be replaced by something fancier later.
 117      */
 118     Val = strtoul (Arg, &End, Base);
 119
 120     /* Check if the conversion was successful */
 121     if (*End != '\0') {
 122
 123         /* Could not convert */
 124         *Num = 0;
 125         return 0;
 126
 127     } else {
 128
 129         /* Conversion ok */
 130         *Num = Val;
 131         return 1;
 132
 133     }
 134 }
 135
 136
 137
 138 static void SetUseChgInfo (CodeEntry* E, const OPCDesc* D)
 139 /* Set the Use and Chg in E */
 140 {
 141     const ZPInfo* Info;
 142
 143     /* If this is a subroutine call, or a jump to an external function,
 144      * lookup the information about this function and use it. The jump itself
 145      * does not change any registers, so we don't need to use the data from D.
 146      */
 147     if ((E->Info & (OF_BRA | OF_CALL)) != 0 && E->JumpTo == 0) {
 148         /* A subroutine call or jump to external symbol (function exit) */
 149         GetFuncInfo (E->Arg, &E->Use, &E->Chg);
 150     } else {
 151         /* Some other instruction. Use the values from the opcode description
 152          * plus addressing mode info.
 153          */
 154         E->Use = D->Use | GetAMUseInfo (E->AM);
 155         E->Chg = D->Chg;
 156
 157         /* Check for special zero page registers used */
 158         switch (E->AM) {
 159
 160             case AM65_ACC:
 161                 if (E->OPC == OP65_ASL || E->OPC == OP65_DEC ||
 162                     E->OPC == OP65_INC || E->OPC == OP65_LSR ||
 163                     E->OPC == OP65_ROL || E->OPC == OP65_ROR) {
 164                     /* A is changed by these insns */
 165                     E->Chg |= REG_A;
 166                 }
 167                 break;
 168
 169             case AM65_ZP:
 170             case AM65_ABS:
 171             /* Be conservative: */
 172             case AM65_ZPX:
 173             case AM65_ABSX:
 174             case AM65_ABSY:
 175                 Info = GetZPInfo (E->Arg);
 176                 if (Info && Info->ByteUse != REG_NONE) {
 177                     if (E->OPC == OP65_ASL || E->OPC == OP65_DEC ||
 178                         E->OPC == OP65_INC || E->OPC == OP65_LSR ||
 179                         E->OPC == OP65_ROL || E->OPC == OP65_ROR ||
 180                         E->OPC == OP65_TRB || E->OPC == OP65_TSB) {
 181                         /* The zp loc is both, input and output */
 182                         E->Chg |= Info->ByteUse;
 183                         E->Use |= Info->ByteUse;
 184                     } else if ((E->Info & OF_STORE) != 0) {
 185                         /* Just output */
 186                         E->Chg |= Info->ByteUse;
 187                     } else {
 188                         /* Input only */
 189                         E->Use |= Info->ByteUse;
 190                     }
 191                 }
 192                 break;
 193
 194             case AM65_ZPX_IND:
 195             case AM65_ZP_INDY:
 196             case AM65_ZP_IND:
 197                 Info = GetZPInfo (E->Arg);
 198                 if (Info && Info->ByteUse != REG_NONE) {
 199                     /* These addressing modes will never change the zp loc */
 200                     E->Use |= Info->WordUse;
 201                 }
 202                 break;
 203
 204             default:
 205                 /* Keep gcc silent */
 206                 break;
 207         }
 208     }
 209 }
 210
 211
 212
 213 /*****************************************************************************/
 214 /*                                   Code                                    */
 215 /*****************************************************************************/
 216
 217
 218
 219 const char* MakeHexArg (unsigned Num)
 220 /* Convert Num into a string in the form $XY, suitable for passing it as an
 221  * argument to NewCodeEntry, and return a pointer to the string.
 222  * BEWARE: The function returns a pointer to a static buffer, so the value is
 223  * gone if you call it twice (and apart from that it's not thread and signal
 224  * safe).
 225  */
 226 {
 227     static char Buf[16];
 228     xsprintf (Buf, sizeof (Buf), "$%02X", (unsigned char) Num);
 229     return Buf;
 230 }
 231
 232
 233
 234 CodeEntry* NewCodeEntry (opc_t OPC, am_t AM, const char* Arg,
 235                          CodeLabel* JumpTo, LineInfo* LI)
 236 /* Create a new code entry, initialize and return it */
 237 {
 238     /* Get the opcode description */
 239     const OPCDesc* D = GetOPCDesc (OPC);
 240
 241     /* Allocate memory */
 242     CodeEntry* E = xmalloc (sizeof (CodeEntry));
 243
 244     /* Initialize the fields */
 245     E->OPC    = D->OPC;
 246     E->AM     = AM;
 247     E->Size   = GetInsnSize (E->OPC, E->AM);
 248     E->Arg    = GetArgCopy (Arg);
 249     E->Flags  = NumArg (E->Arg, &E->Num)? CEF_NUMARG : 0;   /* Needs E->Arg */
 250     E->Info   = D->Info;
 251     E->JumpTo = JumpTo;
 252     E->LI     = UseLineInfo (LI);
 253     E->RI     = 0;
 254     SetUseChgInfo (E, D);
 255     InitCollection (&E->Labels);
 256
 257     /* If we have a label given, add this entry to the label */
 258     if (JumpTo) {
 259         CollAppend (&JumpTo->JumpFrom, E);
 260     }
 261
 262     /* Return the initialized struct */
 263     return E;
 264 }
 265
 266
 267
 268 void FreeCodeEntry (CodeEntry* E)
 269 /* Free the given code entry */
 270 {
 271     /* Free the string argument if we have one */
 272     FreeArg (E->Arg);
 273
 274     /* Cleanup the collection */
 275     DoneCollection (&E->Labels);
 276
 277     /* Release the line info */
 278     ReleaseLineInfo (E->LI);
 279
 280     /* Delete the register info */
 281     CE_FreeRegInfo (E);
 282
 283     /* Free the entry */
 284     xfree (E);
 285 }
 286
 287
 288
 289 void CE_ReplaceOPC (CodeEntry* E, opc_t OPC)
 290 /* Replace the opcode of the instruction. This will also replace related info,
 291  * Size, Use and Chg, but it will NOT update any arguments or labels.
 292  */
 293 {
 294     /* Get the opcode descriptor */
 295     const OPCDesc* D = GetOPCDesc (OPC);
 296
 297     /* Replace the opcode */
 298     E->OPC  = OPC;
 299     E->Info = D->Info;
 300     E->Size = GetInsnSize (E->OPC, E->AM);
 301     SetUseChgInfo (E, D);
 302 }
 303
 304
 305
 306 int CodeEntriesAreEqual (const CodeEntry* E1, const CodeEntry* E2)
 307 /* Check if both code entries are equal */
 308 {
 309     return E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0;
 310 }
 311
 312
 313
 314 void CE_AttachLabel (CodeEntry* E, CodeLabel* L)
 315 /* Attach the label to the entry */
 316 {
 317     /* Add it to the entries label list */
 318     CollAppend (&E->Labels, L);
 319
 320     /* Tell the label about it's owner */
 321     L->Owner = E;
 322 }
 323
 324
 325
 326 void CE_MoveLabel (CodeLabel* L, CodeEntry* E)
 327 /* Move the code label L from it's former owner to the code entry E. */
 328 {
 329     /* Delete the label from the owner */
 330     CollDeleteItem (&L->Owner->Labels, L);
 331
 332     /* Set the new owner */
 333     CollAppend (&E->Labels, L);
 334     L->Owner = E;
 335 }
 336
 337
 338
 339 void CE_SetNumArg (CodeEntry* E, long Num)
 340 /* Set a new numeric argument for the given code entry that must already
 341  * have a numeric argument.
 342  */
 343 {
 344     char Buf[16];
 345
 346     /* Check that the entry has a numerical argument */
 347     CHECK (E->Flags & CEF_NUMARG);
 348
 349     /* Make the new argument string */
 350     if (E->Size == 2) {
 351         Num &= 0xFF;
 352         xsprintf (Buf, sizeof (Buf), "$%02X", (unsigned) Num);
 353     } else if (E->Size == 3) {
 354         Num &= 0xFFFF;
 355         xsprintf (Buf, sizeof (Buf), "$%04X", (unsigned) Num);
 356     } else {
 357         Internal ("Invalid instruction size in CE_SetNumArg");
 358     }
 359
 360     /* Free the old argument */
 361     FreeArg (E->Arg);
 362
 363     /* Assign the new one */
 364     E->Arg = GetArgCopy (Buf);
 365
 366     /* Use the new numerical value */
 367     E->Num = Num;
 368 }
 369
 370
 371
 372 int CE_KnownImm (const CodeEntry* E)
 373 /* Return true if the argument of E is a known immediate value */
 374 {
 375     return (E->AM == AM65_IMM && (E->Flags & CEF_NUMARG) != 0);
 376 }
 377
 378
 379
 380 int CE_UseLoadFlags (const CodeEntry* E)
 381 /* Return true if the instruction uses any flags that are set by a load of
 382  * a register (N and Z).
 383  */
 384 {
 385     /* A branch will use the flags */
 386     if (E->Info & OF_FBRA) {
 387         return 1;
 388     }
 389
 390     /* Call of a boolean transformer routine will also use the flags */
 391     if (E->OPC == OP65_JSR) {
 392         /* Get the condition that is evaluated and check it */
 393         switch (FindBoolCmpCond (E->Arg)) {
 394             case CMP_EQ:
 395             case CMP_NE:
 396             case CMP_GT:
 397             case CMP_GE:
 398             case CMP_LT:
 399             case CMP_LE:
 400             case CMP_UGT:
 401             case CMP_ULE:
 402                 /* Will use the N or Z flags */
 403                 return 1;
 404
 405
 406             case CMP_UGE:       /* Uses only carry */
 407             case CMP_ULT:       /* Dito */
 408             default:            /* No bool transformer subroutine */
 409                 return 0;
 410         }
 411     }
 412
 413     /* Anything else */
 414     return 0;
 415 }
 416
 417
 418
 419 void CE_FreeRegInfo (CodeEntry* E)
 420 /* Free an existing register info struct */
 421 {
 422     if (E->RI) {
 423         FreeRegInfo (E->RI);
 424         E->RI = 0;
 425     }
 426 }
 427
 428
 429
 430 void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs)
 431 /* Generate register info for this instruction. If an old info exists, it is
 432  * overwritten.
 433  */
 434 {
 435     /* Pointers to the register contents */
 436     RegContents* In;
 437     RegContents* Out;
 438
 439     /* Function register usage */
 440     unsigned short Use, Chg;
 441
 442     /* If we don't have a register info struct, allocate one. */
 443     if (E->RI == 0) {
 444         E->RI = NewRegInfo (InputRegs);
 445     } else {
 446         if (InputRegs) {
 447             E->RI->In  = *InputRegs;
 448         } else {
 449             RC_Invalidate (&E->RI->In);
 450         }
 451         E->RI->Out2 = E->RI->Out = E->RI->In;
 452     }
 453
 454     /* Get pointers to the register contents */
 455     In  = &E->RI->In;
 456     Out = &E->RI->Out;
 457
 458     /* Handle the different instructions */
 459     switch (E->OPC) {
 460
 461         case OP65_ADC:
 462             /* We don't know the value of the carry, so the result is
 463              * always unknown.
 464              */
 465             Out->RegA = UNKNOWN_REGVAL;
 466             break;
 467
 468         case OP65_AND:
 469             if (RegValIsKnown (In->RegA)) {
 470                 if (CE_KnownImm (E)) {
 471                     Out->RegA = In->RegA & (short) E->Num;
 472                 } else if (E->AM == AM65_ZP) {
 473                     switch (GetKnownReg (E->Use & REG_ZP, In)) {
 474                         case REG_TMP1:
 475                             Out->RegA = In->RegA & In->Tmp1;
 476                             break;
 477                         case REG_PTR1_LO:
 478                             Out->RegA = In->RegA & In->Ptr1Lo;
 479                             break;
 480                         case REG_PTR1_HI:
 481                             Out->RegA = In->RegA & In->Ptr1Hi;
 482                             break;
 483                         case REG_SREG_LO:
 484                             Out->RegA = In->RegA & In->SRegLo;
 485                             break;
 486                         case REG_SREG_HI:
 487                             Out->RegA = In->RegA & In->SRegHi;
 488                             break;
 489                         default:
 490                             Out->RegA = UNKNOWN_REGVAL;
 491                             break;
 492                     }
 493                 } else {
 494                     Out->RegA = UNKNOWN_REGVAL;
 495                 }
 496             }
 497             break;
 498
 499         case OP65_ASL:
 500             if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 501                 Out->RegA = (In->RegA << 1) & 0xFF;
 502             } else if (E->AM == AM65_ZP) {
 503                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 504                     case REG_TMP1:
 505                         Out->Tmp1 = (In->Tmp1 << 1) & 0xFF;
 506                         break;
 507                     case REG_PTR1_LO:
 508                         Out->Ptr1Lo = (In->Ptr1Lo << 1) & 0xFF;
 509                         break;
 510                     case REG_PTR1_HI:
 511                         Out->Ptr1Hi = (In->Ptr1Hi << 1) & 0xFF;
 512                         break;
 513                     case REG_SREG_LO:
 514                         Out->SRegLo = (In->SRegLo << 1) & 0xFF;
 515                         break;
 516                     case REG_SREG_HI:
 517                         Out->SRegHi = (In->SRegHi << 1) & 0xFF;
 518                         break;
 519                 }
 520             } else if (E->AM == AM65_ZPX) {
 521                 /* Invalidates all ZP registers */
 522                 RC_InvalidateZP (Out);
 523             }
 524             break;
 525
 526         case OP65_BCC:
 527             break;
 528
 529         case OP65_BCS:
 530             break;
 531
 532         case OP65_BEQ:
 533             break;
 534
 535         case OP65_BIT:
 536             break;
 537
 538         case OP65_BMI:
 539             break;
 540
 541         case OP65_BNE:
 542             break;
 543
 544         case OP65_BPL:
 545             break;
 546
 547         case OP65_BRA:
 548             break;
 549
 550         case OP65_BRK:
 551             break;
 552
 553         case OP65_BVC:
 554             break;
 555
 556         case OP65_BVS:
 557             break;
 558
 559         case OP65_CLC:
 560             break;
 561
 562         case OP65_CLD:
 563             break;
 564
 565         case OP65_CLI:
 566             break;
 567
 568         case OP65_CLV:
 569             break;
 570
 571         case OP65_CMP:
 572             break;
 573
 574         case OP65_CPX:
 575             break;
 576
 577         case OP65_CPY:
 578             break;
 579
 580         case OP65_DEA:
 581             if (RegValIsKnown (In->RegA)) {
 582                 Out->RegA = (In->RegA - 1) & 0xFF;
 583             }
 584             break;
 585
 586         case OP65_DEC:
 587             if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 588                 Out->RegA = (In->RegA - 1) & 0xFF;
 589             } else if (E->AM == AM65_ZP) {
 590                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 591                     case REG_TMP1:
 592                         Out->Tmp1 = (In->Tmp1 - 1) & 0xFF;
 593                         break;
 594                     case REG_PTR1_LO:
 595                         Out->Ptr1Lo = (In->Ptr1Lo - 1) & 0xFF;
 596                         break;
 597                     case REG_PTR1_HI:
 598                         Out->Ptr1Hi = (In->Ptr1Hi - 1) & 0xFF;
 599                         break;
 600                     case REG_SREG_LO:
 601                         Out->SRegLo = (In->SRegLo - 1) & 0xFF;
 602                         break;
 603                     case REG_SREG_HI:
 604                         Out->SRegHi = (In->SRegHi - 1) & 0xFF;
 605                         break;
 606                 }
 607             } else if (E->AM == AM65_ZPX) {
 608                 /* Invalidates all ZP registers */
 609                 RC_InvalidateZP (Out);
 610             }
 611             break;
 612
 613         case OP65_DEX:
 614             if (RegValIsKnown (In->RegX)) {
 615                 Out->RegX = (In->RegX - 1) & 0xFF;
 616             }
 617             break;
 618
 619         case OP65_DEY:
 620             if (RegValIsKnown (In->RegY)) {
 621                 Out->RegY = (In->RegY - 1) & 0xFF;
 622             }
 623             break;
 624
 625         case OP65_EOR:
 626             if (RegValIsKnown (In->RegA)) {
 627                 if (CE_KnownImm (E)) {
 628                     Out->RegA = In->RegA ^ (short) E->Num;
 629                 } else if (E->AM == AM65_ZP) {
 630                     switch (GetKnownReg (E->Use & REG_ZP, In)) {
 631                         case REG_TMP1:
 632                             Out->RegA = In->RegA ^ In->Tmp1;
 633                             break;
 634                         case REG_PTR1_LO:
 635                             Out->RegA = In->RegA ^ In->Ptr1Lo;
 636                             break;
 637                         case REG_PTR1_HI:
 638                             Out->RegA = In->RegA ^ In->Ptr1Hi;
 639                             break;
 640                         case REG_SREG_LO:
 641                             Out->RegA = In->RegA ^ In->SRegLo;
 642                             break;
 643                         case REG_SREG_HI:
 644                             Out->RegA = In->RegA ^ In->SRegHi;
 645                             break;
 646                         default:
 647                             Out->RegA = UNKNOWN_REGVAL;
 648                             break;
 649                     }
 650                 } else {
 651                     Out->RegA = UNKNOWN_REGVAL;
 652                 }
 653             }
 654             break;
 655
 656         case OP65_INA:
 657             if (RegValIsKnown (In->RegA)) {
 658                 Out->RegA = (In->RegA + 1) & 0xFF;
 659             }
 660             break;
 661
 662         case OP65_INC:
 663             if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 664                 Out->RegA = (In->RegA + 1) & 0xFF;
 665             } else if (E->AM == AM65_ZP) {
 666                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 667                     case REG_TMP1:
 668                         Out->Tmp1 = (In->Tmp1 + 1) & 0xFF;
 669                         break;
 670                     case REG_PTR1_LO:
 671                         Out->Ptr1Lo = (In->Ptr1Lo + 1) & 0xFF;
 672                         break;
 673                     case REG_PTR1_HI:
 674                         Out->Ptr1Hi = (In->Ptr1Hi + 1) & 0xFF;
 675                         break;
 676                     case REG_SREG_LO:
 677                         Out->SRegLo = (In->SRegLo + 1) & 0xFF;
 678                         break;
 679                     case REG_SREG_HI:
 680                         Out->SRegHi = (In->SRegHi + 1) & 0xFF;
 681                         break;
 682                 }
 683             } else if (E->AM == AM65_ZPX) {
 684                 /* Invalidates all ZP registers */
 685                 RC_InvalidateZP (Out);
 686             }
 687             break;
 688
 689         case OP65_INX:
 690             if (RegValIsKnown (In->RegX)) {
 691                 Out->RegX = (In->RegX + 1) & 0xFF;
 692             }
 693             break;
 694
 695         case OP65_INY:
 696             if (RegValIsKnown (In->RegY)) {
 697                 Out->RegY = (In->RegY + 1) & 0xFF;
 698             }
 699             break;
 700
 701         case OP65_JCC:
 702             break;
 703
 704         case OP65_JCS:
 705             break;
 706
 707         case OP65_JEQ:
 708             break;
 709
 710         case OP65_JMI:
 711             break;
 712
 713         case OP65_JMP:
 714             break;
 715
 716         case OP65_JNE:
 717             break;
 718
 719         case OP65_JPL:
 720             break;
 721
 722         case OP65_JSR:
 723             /* Get the code info for the function */
 724             GetFuncInfo (E->Arg, &Use, &Chg);
 725             if (Chg & REG_A) {
 726                 Out->RegA = UNKNOWN_REGVAL;
 727             }
 728             if (Chg & REG_X) {
 729                 Out->RegX = UNKNOWN_REGVAL;
 730             }
 731             if (Chg & REG_Y) {
 732                 Out->RegY = UNKNOWN_REGVAL;
 733             }
 734             if (Chg & REG_TMP1) {
 735                 Out->Tmp1 = UNKNOWN_REGVAL;
 736             }
 737             if (Chg & REG_PTR1_LO) {
 738                 Out->Ptr1Lo = UNKNOWN_REGVAL;
 739             }
 740             if (Chg & REG_PTR1_HI) {
 741                 Out->Ptr1Hi = UNKNOWN_REGVAL;
 742             }
 743             if (Chg & REG_SREG_LO) {
 744                 Out->SRegLo = UNKNOWN_REGVAL;
 745             }
 746             if (Chg & REG_SREG_HI) {
 747                 Out->SRegHi = UNKNOWN_REGVAL;
 748             }
 749             /* ## FIXME: Quick hack for some known functions: */
 750             if (strcmp (E->Arg, "tosandax") == 0) {
 751                 if (In->RegA == 0) {
 752                     Out->RegA = 0;
 753                 }
 754                 if (In->RegX == 0) {
 755                     Out->RegX = 0;
 756                 }
 757             } else if (strcmp (E->Arg, "tosorax") == 0) {
 758                 if (In->RegA == 0xFF) {
 759                     Out->RegA = 0xFF;
 760                 }
 761                 if (In->RegX == 0xFF) {
 762                     Out->RegX = 0xFF;
 763                 }
 764             } else if (FindBoolCmpCond (E->Arg) != CMP_INV) {
 765                 Out->RegX = 0;
 766             }
 767             break;
 768
 769         case OP65_JVC:
 770             break;
 771
 772         case OP65_JVS:
 773             break;
 774
 775         case OP65_LDA:
 776             if (CE_KnownImm (E)) {
 777                 Out->RegA = (unsigned char) E->Num;
 778             } else if (E->AM == AM65_ZP) {
 779                 switch (GetKnownReg (E->Use & REG_ZP, In)) {
 780                     case REG_TMP1:
 781                         Out->RegA = In->Tmp1;
 782                         break;
 783                     case REG_PTR1_LO:
 784                         Out->RegA = In->Ptr1Lo;
 785                         break;
 786                     case REG_PTR1_HI:
 787                         Out->RegA = In->Ptr1Hi;
 788                         break;
 789                     case REG_SREG_LO:
 790                         Out->RegA = In->SRegLo;
 791                         break;
 792                     case REG_SREG_HI:
 793                         Out->RegA = In->SRegHi;
 794                         break;
 795                     default:
 796                         Out->RegA = UNKNOWN_REGVAL;
 797                         break;
 798                 }
 799             } else {
 800                 /* A is now unknown */
 801                 Out->RegA = UNKNOWN_REGVAL;
 802             }
 803             break;
 804
 805         case OP65_LDX:
 806             if (CE_KnownImm (E)) {
 807                 Out->RegX = (unsigned char) E->Num;
 808             } else if (E->AM == AM65_ZP) {
 809                 switch (GetKnownReg (E->Use & REG_ZP, In)) {
 810                     case REG_TMP1:
 811                         Out->RegX = In->Tmp1;
 812                         break;
 813                     case REG_PTR1_LO:
 814                         Out->RegX = In->Ptr1Lo;
 815                         break;
 816                     case REG_PTR1_HI:
 817                         Out->RegX = In->Ptr1Hi;
 818                         break;
 819                     case REG_SREG_LO:
 820                         Out->RegX = In->SRegLo;
 821                         break;
 822                     case REG_SREG_HI:
 823                         Out->RegX = In->SRegHi;
 824                         break;
 825                     default:
 826                         Out->RegX = UNKNOWN_REGVAL;
 827                         break;
 828                 }
 829             } else {
 830                 /* X is now unknown */
 831                 Out->RegX = UNKNOWN_REGVAL;
 832             }
 833             break;
 834
 835         case OP65_LDY:
 836             if (CE_KnownImm (E)) {
 837                 Out->RegY = (unsigned char) E->Num;
 838             } else if (E->AM == AM65_ZP) {
 839                 switch (GetKnownReg (E->Use & REG_ZP, In)) {
 840                     case REG_TMP1:
 841                         Out->RegY = In->Tmp1;
 842                         break;
 843                     case REG_PTR1_LO:
 844                         Out->RegY = In->Ptr1Lo;
 845                         break;
 846                     case REG_PTR1_HI:
 847                         Out->RegY = In->Ptr1Hi;
 848                         break;
 849                     case REG_SREG_LO:
 850                         Out->RegY = In->SRegLo;
 851                         break;
 852                     case REG_SREG_HI:
 853                         Out->RegY = In->SRegHi;
 854                         break;
 855                     default:
 856                         Out->RegY = UNKNOWN_REGVAL;
 857                         break;
 858                 }
 859             } else {
 860                 /* Y is now unknown */
 861                 Out->RegY = UNKNOWN_REGVAL;
 862             }
 863             break;
 864
 865         case OP65_LSR:
 866             if (E->AM == AM65_ACC && RegValIsKnown (In->RegA)) {
 867                 Out->RegA = (In->RegA >> 1) & 0xFF;
 868             } else if (E->AM == AM65_ZP) {
 869                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 870                     case REG_TMP1:
 871                         Out->Tmp1 = (In->Tmp1 >> 1) & 0xFF;
 872                         break;
 873                     case REG_PTR1_LO:
 874                         Out->Ptr1Lo = (In->Ptr1Lo >> 1) & 0xFF;
 875                         break;
 876                     case REG_PTR1_HI:
 877                         Out->Ptr1Hi = (In->Ptr1Hi >> 1) & 0xFF;
 878                         break;
 879                     case REG_SREG_LO:
 880                         Out->SRegLo = (In->SRegLo >> 1) & 0xFF;
 881                         break;
 882                     case REG_SREG_HI:
 883                         Out->SRegHi = (In->SRegHi >> 1) & 0xFF;
 884                         break;
 885                 }
 886             } else if (E->AM == AM65_ZPX) {
 887                 /* Invalidates all ZP registers */
 888                 RC_InvalidateZP (Out);
 889             }
 890             break;
 891
 892         case OP65_NOP:
 893             break;
 894
 895         case OP65_ORA:
 896             if (RegValIsKnown (In->RegA)) {
 897                 if (CE_KnownImm (E)) {
 898                     Out->RegA = In->RegA | (short) E->Num;
 899                 } else if (E->AM == AM65_ZP) {
 900                     switch (GetKnownReg (E->Use & REG_ZP, In)) {
 901                         case REG_TMP1:
 902                             Out->RegA = In->RegA | In->Tmp1;
 903                             break;
 904                         case REG_PTR1_LO:
 905                             Out->RegA = In->RegA | In->Ptr1Lo;
 906                             break;
 907                         case REG_PTR1_HI:
 908                             Out->RegA = In->RegA | In->Ptr1Hi;
 909                             break;
 910                         case REG_SREG_LO:
 911                             Out->RegA = In->RegA | In->SRegLo;
 912                             break;
 913                         case REG_SREG_HI:
 914                             Out->RegA = In->RegA | In->SRegHi;
 915                             break;
 916                         default:
 917                             Out->RegA = UNKNOWN_REGVAL;
 918                             break;
 919                     }
 920                 } else {
 921                     /* A is now unknown */
 922                     Out->RegA = UNKNOWN_REGVAL;
 923                 }
 924             }
 925             break;
 926
 927         case OP65_PHA:
 928             break;
 929
 930         case OP65_PHP:
 931             break;
 932
 933         case OP65_PHX:
 934             break;
 935
 936         case OP65_PHY:
 937             break;
 938
 939         case OP65_PLA:
 940             Out->RegA = UNKNOWN_REGVAL;
 941             break;
 942
 943         case OP65_PLP:
 944             break;
 945
 946         case OP65_PLX:
 947             Out->RegX = UNKNOWN_REGVAL;
 948             break;
 949
 950         case OP65_PLY:
 951             Out->RegY = UNKNOWN_REGVAL;
 952             break;
 953
 954         case OP65_ROL:
 955             /* We don't know the value of the carry bit */
 956             if (E->AM == AM65_ACC) {
 957                 Out->RegA = UNKNOWN_REGVAL;
 958             } else if (E->AM == AM65_ZP) {
 959                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 960                     case REG_TMP1:
 961                         Out->Tmp1 = UNKNOWN_REGVAL;
 962                         break;
 963                     case REG_PTR1_LO:
 964                         Out->Ptr1Lo = UNKNOWN_REGVAL;
 965                         break;
 966                     case REG_PTR1_HI:
 967                         Out->Ptr1Hi = UNKNOWN_REGVAL;
 968                         break;
 969                     case REG_SREG_LO:
 970                         Out->SRegLo = UNKNOWN_REGVAL;
 971                         break;
 972                     case REG_SREG_HI:
 973                         Out->SRegHi = UNKNOWN_REGVAL;
 974                         break;
 975                 }
 976             } else if (E->AM == AM65_ZPX) {
 977                 /* Invalidates all ZP registers */
 978                 RC_InvalidateZP (Out);
 979             }
 980             break;
 981
 982         case OP65_ROR:
 983             /* We don't know the value of the carry bit */
 984             if (E->AM == AM65_ACC) {
 985                 Out->RegA = UNKNOWN_REGVAL;
 986             } else if (E->AM == AM65_ZP) {
 987                 switch (GetKnownReg (E->Chg & REG_ZP, In)) {
 988                     case REG_TMP1:
 989                         Out->Tmp1 = UNKNOWN_REGVAL;
 990                         break;
 991                     case REG_PTR1_LO:
 992                         Out->Ptr1Lo = UNKNOWN_REGVAL;
 993                         break;
 994                     case REG_PTR1_HI:
 995                         Out->Ptr1Hi = UNKNOWN_REGVAL;
 996                         break;
 997                     case REG_SREG_LO:
 998                         Out->SRegLo = UNKNOWN_REGVAL;
 999                         break;
1000                     case REG_SREG_HI:
1001                         Out->SRegHi = UNKNOWN_REGVAL;
1002                         break;
1003                 }
1004             } else if (E->AM == AM65_ZPX) {
1005                 /* Invalidates all ZP registers */
1006                 RC_InvalidateZP (Out);
1007             }
1008             break;
1009
1010         case OP65_RTI:
1011             break;
1012
1013         case OP65_RTS:
1014             break;
1015
1016         case OP65_SBC:
1017             /* We don't know the value of the carry bit */
1018             Out->RegA = UNKNOWN_REGVAL;
1019             break;
1020
1021         case OP65_SEC:
1022             break;
1023
1024         case OP65_SED:
1025             break;
1026
1027         case OP65_SEI:
1028             break;
1029
1030         case OP65_STA:
1031             if (E->AM == AM65_ZP) {
1032                 switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
1033                     case REG_TMP1:
1034                         Out->Tmp1 = In->RegA;
1035                         break;
1036                     case REG_PTR1_LO:
1037                         Out->Ptr1Lo = In->RegA;
1038                         break;
1039                     case REG_PTR1_HI:
1040                         Out->Ptr1Hi = In->RegA;
1041                         break;
1042                     case REG_SREG_LO:
1043                         Out->SRegLo = In->RegA;
1044                         break;
1045                     case REG_SREG_HI:
1046                         Out->SRegHi = In->RegA;
1047                         break;
1048                 }
1049             } else if (E->AM == AM65_ZPX) {
1050                 /* Invalidates all ZP registers */
1051                 RC_InvalidateZP (Out);
1052             }
1053             break;
1054
1055         case OP65_STX:
1056             if (E->AM == AM65_ZP) {
1057                 switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
1058                     case REG_TMP1:
1059                         Out->Tmp1 = In->RegX;
1060                         break;
1061                     case REG_PTR1_LO:
1062                         Out->Ptr1Lo = In->RegX;
1063                         break;
1064                     case REG_PTR1_HI:
1065                         Out->Ptr1Hi = In->RegX;
1066                         break;
1067                     case REG_SREG_LO:
1068                         Out->SRegLo = In->RegX;
1069                         break;
1070                     case REG_SREG_HI:
1071                         Out->SRegHi = In->RegX;
1072                         break;
1073                 }
1074             } else if (E->AM == AM65_ZPX) {
1075                 /* Invalidates all ZP registers */
1076                 RC_InvalidateZP (Out);
1077             }
1078             break;
1079
1080         case OP65_STY:
1081             if (E->AM == AM65_ZP) {
1082                 switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
1083                     case REG_TMP1:
1084                         Out->Tmp1 = In->RegY;
1085                         break;
1086                     case REG_PTR1_LO:
1087                         Out->Ptr1Lo = In->RegY;
1088                         break;
1089                     case REG_PTR1_HI:
1090                         Out->Ptr1Hi = In->RegY;
1091                         break;
1092                     case REG_SREG_LO:
1093                         Out->SRegLo = In->RegY;
1094                         break;
1095                     case REG_SREG_HI:
1096                         Out->SRegHi = In->RegY;
1097                         break;
1098                 }
1099             } else if (E->AM == AM65_ZPX) {
1100                 /* Invalidates all ZP registers */
1101                 RC_InvalidateZP (Out);
1102             }
1103             break;
1104
1105         case OP65_STZ:
1106             if (E->AM == AM65_ZP) {
1107                 switch (GetKnownReg (E->Chg & REG_ZP, 0)) {
1108                     case REG_TMP1:
1109                         Out->Tmp1 = 0;
1110                         break;
1111                     case REG_PTR1_LO:
1112                         Out->Ptr1Lo = 0;
1113                         break;
1114                     case REG_PTR1_HI:
1115                         Out->Ptr1Hi = 0;
1116                         break;
1117                     case REG_SREG_LO:
1118                         Out->SRegLo = 0;
1119                         break;
1120                     case REG_SREG_HI:
1121                         Out->SRegHi = 0;
1122                         break;
1123                 }
1124             } else if (E->AM == AM65_ZPX) {
1125                 /* Invalidates all ZP registers */
1126                 RC_InvalidateZP (Out);
1127             }
1128             break;
1129
1130         case OP65_TAX:
1131             Out->RegX = In->RegA;
1132             break;
1133
1134         case OP65_TAY:
1135             Out->RegY = In->RegA;
1136             break;
1137
1138         case OP65_TRB:
1139             if (E->AM == AM65_ZPX) {
1140                 /* Invalidates all ZP registers */
1141                 RC_InvalidateZP (Out);
1142             } else if (E->AM == AM65_ZP) {
1143                 if (RegValIsKnown (In->RegA)) {
1144                     switch (GetKnownReg (E->Chg & REG_ZP, In)) {
1145                         case REG_TMP1:
1146                             Out->Tmp1 &= ~In->RegA;
1147                             break;
1148                         case REG_PTR1_LO:
1149                             Out->Ptr1Lo &= ~In->RegA;
1150                             break;
1151                         case REG_PTR1_HI:
1152                             Out->Ptr1Hi &= ~In->RegA;
1153                             break;
1154                         case REG_SREG_LO:
1155                             Out->SRegLo &= ~In->RegA;
1156                             break;
1157                         case REG_SREG_HI:
1158                             Out->SRegHi &= ~In->RegA;
1159                             break;
1160                     }
1161                 } else {
1162                     switch (GetKnownReg (E->Chg & REG_ZP, In)) {
1163                         case REG_TMP1:
1164                             Out->Tmp1 = UNKNOWN_REGVAL;
1165                             break;
1166                         case REG_PTR1_LO:
1167                             Out->Ptr1Lo = UNKNOWN_REGVAL;
1168                             break;
1169                         case REG_PTR1_HI:
1170                             Out->Ptr1Hi = UNKNOWN_REGVAL;
1171                             break;
1172                         case REG_SREG_LO:
1173                             Out->SRegLo = UNKNOWN_REGVAL;
1174                             break;
1175                         case REG_SREG_HI:
1176                             Out->SRegHi = UNKNOWN_REGVAL;
1177                             break;
1178                     }
1179                 }
1180             }
1181             break;
1182
1183         case OP65_TSB:
1184             if (E->AM == AM65_ZPX) {
1185                 /* Invalidates all ZP registers */
1186                 RC_InvalidateZP (Out);
1187             } else if (E->AM == AM65_ZP) {
1188                 if (RegValIsKnown (In->RegA)) {
1189                     switch (GetKnownReg (E->Chg & REG_ZP, In)) {
1190                         case REG_TMP1:
1191                             Out->Tmp1 |= In->RegA;
1192                             break;
1193                         case REG_PTR1_LO:
1194                             Out->Ptr1Lo |= In->RegA;
1195                             break;
1196                         case REG_PTR1_HI:
1197                             Out->Ptr1Hi |= In->RegA;
1198                             break;
1199                         case REG_SREG_LO:
1200                             Out->SRegLo |= In->RegA;
1201                             break;
1202                         case REG_SREG_HI:
1203                             Out->SRegHi |= In->RegA;
1204                             break;
1205                     }
1206                 } else {
1207                     switch (GetKnownReg (E->Chg & REG_ZP, In)) {
1208                         case REG_TMP1:
1209                             Out->Tmp1 = UNKNOWN_REGVAL;
1210                             break;
1211                         case REG_PTR1_LO:
1212                             Out->Ptr1Lo = UNKNOWN_REGVAL;
1213                             break;
1214                         case REG_PTR1_HI:
1215                             Out->Ptr1Hi = UNKNOWN_REGVAL;
1216                             break;
1217                         case REG_SREG_LO:
1218                             Out->SRegLo = UNKNOWN_REGVAL;
1219                             break;
1220                         case REG_SREG_HI:
1221                             Out->SRegHi = UNKNOWN_REGVAL;
1222                             break;
1223                     }
1224                 }
1225             }
1226             break;
1227
1228         case OP65_TSX:
1229             Out->RegX = UNKNOWN_REGVAL;
1230             break;
1231
1232         case OP65_TXA:
1233             Out->RegA = In->RegX;
1234             break;
1235
1236         case OP65_TXS:
1237             break;
1238
1239         case OP65_TYA:
1240             Out->RegA = In->RegY;
1241             break;
1242
1243         default:
1244             break;
1245
1246     }
1247 }
1248
1249
1250
1251 static char* RegInfoDesc (unsigned U, char* Buf)
1252 /* Return a string containing register info */
1253 {
1254     Buf[0] = '\0';
1255
1256     strcat (Buf, U & REG_SREG_HI? "H" : "_");
1257     strcat (Buf, U & REG_SREG_LO? "L" : "_");
1258     strcat (Buf, U & REG_A?       "A" : "_");
1259     strcat (Buf, U & REG_X?       "X" : "_");
1260     strcat (Buf, U & REG_Y?       "Y" : "_");
1261     strcat (Buf, U & REG_TMP1?    "T1" : "__");
1262     strcat (Buf, U & REG_PTR1?    "1" : "_");
1263     strcat (Buf, U & REG_PTR2?    "2" : "_");
1264     strcat (Buf, U & REG_SAVE?    "V"  : "_");
1265     strcat (Buf, U & REG_SP?      "S" : "_");
1266
1267     return Buf;
1268 }
1269
1270
1271
1272 void CE_Output (const CodeEntry* E, FILE* F)
1273 /* Output the code entry to a file */
1274 {
1275     const OPCDesc* D;
1276     unsigned Chars;
1277     const char* Target;
1278
1279     /* If we have a label, print that */
1280     unsigned LabelCount = CollCount (&E->Labels);
1281     unsigned I;
1282     for (I = 0; I < LabelCount; ++I) {
1283         CL_Output (CollConstAt (&E->Labels, I), F);
1284     }
1285
1286     /* Get the opcode description */
1287     D = GetOPCDesc (E->OPC);
1288
1289     /* Print the mnemonic */
1290     Chars = fprintf (F, "\t%s", D->Mnemo);
1291
1292     /* Print the operand */
1293     switch (E->AM) {
1294
1295         case AM_IMP:
1296         case AM65_IMP:
1297             /* implicit */
1298             break;
1299
1300         case AM65_ACC:
1301             /* accumulator */
1302             Chars += fprintf (F, "%*sa", 9-Chars, "");
1303             break;
1304
1305         case AM_IMM:
1306         case AM65_IMM:
1307             /* immidiate */
1308             Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg);
1309             break;
1310
1311         case AM_ABS:
1312         case AM65_ZP:
1313         case AM65_ABS:
1314             /* zeropage and absolute */
1315             Chars += fprintf (F, "%*s%s", 9-Chars, "", E->Arg);
1316             break;
1317
1318         case AM65_ZPX:
1319         case AM65_ABSX:
1320             /* zeropage,X and absolute,X */
1321             Chars += fprintf (F, "%*s%s,x", 9-Chars, "", E->Arg);
1322             break;
1323
1324         case AM65_ABSY:
1325             /* absolute,Y */
1326             Chars += fprintf (F, "%*s%s,y", 9-Chars, "", E->Arg);
1327             break;
1328
1329         case AM65_ZPX_IND:
1330             /* (zeropage,x) */
1331             Chars += fprintf (F, "%*s(%s,x)", 9-Chars, "", E->Arg);
1332             break;
1333
1334         case AM65_ZP_INDY:
1335             /* (zeropage),y */
1336             Chars += fprintf (F, "%*s(%s),y", 9-Chars, "", E->Arg);
1337             break;
1338
1339         case AM65_ZP_IND:
1340             /* (zeropage) */
1341             Chars += fprintf (F, "%*s(%s)", 9-Chars, "", E->Arg);
1342             break;
1343
1344         case AM65_BRA:
1345             /* branch */
1346             Target = E->JumpTo? E->JumpTo->Name : E->Arg;
1347             Chars += fprintf (F, "%*s%s", 9-Chars, "", Target);
1348             break;
1349
1350         default:
1351             Internal ("Invalid addressing mode");
1352
1353     }
1354
1355     /* Print usage info if requested by the debugging flag */
1356     if (Debug) {
1357         char Use [128];
1358         char Chg [128];
1359         fprintf (F,
1360                  "%*s; USE: %-12s CHG: %-12s SIZE: %u\n",
1361                  30-Chars, "",
1362                  RegInfoDesc (E->Use, Use),
1363                  RegInfoDesc (E->Chg, Chg),
1364                  E->Size);
1365     } else {
1366         /* Terminate the line */
1367         fprintf (F, "\n");
1368     }
1369 }
1370
1371
1372
1373
1374
1375