X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=procln.c;h=9c207bfdefe8481ca71195ad1ad7c3aaaf7c3471;hp=ab9d53a0eefc98397348f71a3a55cfd7f7565608;hb=4205233c8397c581b4d27ab36ab81ec896ef3dd0;hpb=11a78647f7f170e6ea39dd04a3734a359151debb diff --git a/procln.c b/procln.c index ab9d53a..9c207bf 100644 --- a/procln.c +++ b/procln.c @@ -1,24 +1,28 @@ // -// RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System +// RMAC - Reboot's Macro Assembler for all Atari computers // PROCLN.C - Line Processing -// Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends +// Copyright (C) 199x Landon Dyer, 2011-2020 Reboot and Friends // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986 -// Source Utilised with the Kind Permission of Landon Dyer +// Source utilised with the kind permission of Landon Dyer // #include "procln.h" -#include "listing.h" +#include "6502.h" #include "amode.h" +#include "direct.h" +#include "dsp56k_amode.h" +#include "dsp56k_mach.h" #include "error.h" -#include "sect.h" #include "expr.h" +#include "listing.h" #include "mach.h" -#include "direct.h" #include "macro.h" +#include "op.h" +#include "riscasm.h" +#include "sect.h" #include "symbol.h" -#include "risca.h" -#define DEF_KW // Declare keyword values +#define DEF_KW // Declare keyword values #include "kwtab.h" // Incl generated keyword tables & defs #define DEF_MN // Incl 68k keyword definitions @@ -29,24 +33,36 @@ #define DECL_MR #include "risckw.h" +#define DEF_MP // Include 6502 keyword definitions +#define DECL_MP // Include 6502 keyword state machine tables +#include "6502kw.h" + +#define DEF_MO // Include OP keyword definitions +#define DECL_MO // Include OP keyword state machine tables +#include "opkw.h" + +#define DEF_DSP // Include DSP56K keywords definitions +#define DECL_DSP // Include DSP56K keyword state machine tables +#include "dsp56kkw.h" + IFENT * ifent; // Current ifent static IFENT ifent0; // Root ifent -static IFENT * f_ifent; // Freelist of ifents -static int disabled; // Assembly conditionally disabled -int just_bss; // 1, ds.b in microprocessor mode -VALUE pcloc; // Value of "PC" at beginning of line -IFENT * ifent; // Current ifent +IFENT * f_ifent; // Freelist of ifents +int disabled; // Assembly conditionally disabled +int just_bss; // 1, ds.b in microprocessor mode +uint32_t pcloc; // Value of "PC" at beginning of line SYM * lab_sym; // Label on line (or NULL) +char * label_defined; // The name of the last label defined in current line (if any) -char extra_stuff[] = "extra (unexpected) text found after addressing mode"; -char * comma_error = "missing comma"; -char * syntax_error = "syntax error"; -char * locgl_error = "cannot GLOBL local symbol"; -char * lab_ignored = "label ignored"; +const char extra_stuff[] = "extra (unexpected) text found after addressing mode"; +const char comma_error[] = "missing comma"; +const char syntax_error[] = "syntax error"; +const char locgl_error[] = "cannot GLOBL local symbol"; +const char lab_ignored[] = "label ignored"; // Table to convert an addressing-mode number to a bitmask. -LONG amsktab[0112] = { +LONG amsktab[0124] = { M_DREG, M_DREG, M_DREG, M_DREG, M_DREG, M_DREG, M_DREG, M_DREG, @@ -68,31 +84,45 @@ LONG amsktab[0112] = { M_AINDEXED, M_AINDEXED, M_AINDEXED, M_AINDEXED, M_AINDEXED, M_AINDEXED, M_AINDEXED, M_AINDEXED, - M_ABSW, // 070 - M_ABSL, // 071 - M_PCDISP, // 072 - M_PCINDEXED, // 073 - M_IMMED, // 074 - 0L, // 075 - 0L, // 076 - 0L, // 077 - M_ABASE, // 0100 - M_MEMPOST, // 0101 - M_MEMPRE, // 0102 - M_PCBASE, // 0103 - M_PCMPOST, // 0104 - M_PCMPRE, // 0105 - M_AM_USP, // 0106 - M_AM_SR, // 0107 - M_AM_CCR, // 0110 - M_AM_NONE // 0111 -}; // 0112 length + M_ABSW, // 070 + M_ABSL, // 071 + M_PCDISP, // 072 + M_PCINDEXED, // 073 + M_IMMED, // 074 + 0L, // 075 + 0L, // 076 + 0L, // 077 + M_ABASE, // 0100 + M_MEMPOST, // 0101 + M_MEMPRE, // 0102 + M_PCBASE, // 0103 + M_PCMPOST, // 0104 + M_PCMPRE, // 0105 + M_AM_USP, // 0106 + M_AM_SR, // 0107 + M_AM_CCR, // 0110 + M_AM_NONE, // 0111 + 0x30, // 0112 + 0x30, // 0113 + 0L, // 0114 + 0L, // 0115 + 0L, // 0116 + 0L, // 0117 + M_CACHE40, // 0120 + M_CREG, // 0121 + M_FREG, // 0122 + M_FPSCR // 0123 +}; // 0123 length + + +// Function prototypes +int HandleLabel(char *, int); // -// Initialize Line Processor +// Initialize line processor // -void init_procln(void) +void InitLineProcessor(void) { disabled = 0; ifent = &ifent0; @@ -102,7 +132,7 @@ void init_procln(void) // -// Line Processor +// Line processor // void Assemble(void) { @@ -114,7 +144,7 @@ void Assemble(void) char * equate; // Symbol (or NULL) int labtyp = 0; // Label type (':', DCOLON) int equtyp = 0; // Equ type ('=', DEQUALS) - VALUE eval; // Expression value + uint64_t eval; // Expression value WORD eattr; // Expression attributes SYM * esym; // External symbol involved in expr. WORD siz = 0; // Size suffix to mnem/diretve/macro @@ -123,19 +153,17 @@ void Assemble(void) SYM * sy, * sy2; // Symbol (temp usage) char * opname = NULL; // Name of dirctve/mnemonic/macro int listflag; // 0: Don't call listeol() - int as68mode = 0; // 1: Handle multiple labels WORD rmask; // Register list, for REG int registerbank; // RISC register bank int riscreg; // RISC register - listflag = 0; // Initialise listing flag loop: // Line processing loop label // Get another line of tokens - if (tokln() == TKEOF) + if (TokenizeLine() == TKEOF) { -if (verb_flag) printf("Assemble: Found TKEOF flag...\n"); +DEBUG { printf("Assemble: Found TKEOF flag...\n"); } if (list_flag && listflag) // Flush last line of source listeol(); @@ -145,7 +173,7 @@ if (verb_flag) printf("Assemble: Found TKEOF flag...\n"); return; } - DEBUG DumpTokenBuffer(); + DEBUG { DumpTokenBuffer(); } if (list_flag) { @@ -159,20 +187,25 @@ if (verb_flag) printf("Assemble: Found TKEOF flag...\n"); state = -3; // No keyword (just EOL) label = NULL; // No label + label_defined = NULL; // No label defined yet lab_sym = NULL; // No (exported) label equate = NULL; // No equate tk = tok; // Save first token in line - pcloc = (VALUE)sloc; // Set beginning-of-line PC + pcloc = (uint32_t)sloc; // Set beginning-of-line PC loop1: // Internal line processing loop if (*tok == EOL) // Restart loop if end-of-line goto loop; - // First token MUST be a symbol + // First token MUST be a symbol (Shamus: not sure why :-/) if (*tok != SYMBOL) { - error(syntax_error); + if ((*tok >= KW_D0) && (*tok <= KW_R31)) + error("cannot use reserved keyword as label name or .equ"); + else + error("syntax error; expected symbol"); + goto loop; } @@ -180,7 +213,6 @@ loop1: // Internal line processing loop if (j == '=' || j == DEQUALS || j == SET || j == REG || j == EQUREG || j == CCDEF) { -// equate = (char *)tok[1]; equate = string[tok[1]]; equtyp = j; tok += 3; @@ -191,43 +223,36 @@ loop1: // Internal line processing loop if (j == ':' || j == DCOLON) { as68label: -// label = (char *)tok[1]; // Get label name label = string[tok[1]]; // Get label name labtyp = tok[2]; // Get label type tok += 3; // Go to next line token - // Handle multiple labels; if there's another label, go process it, - // and come back at `as68label' above. - if (as68_flag) + // AS68 MODE: + // Looks like another label follows the previous one, so handle + // the previous one until there aren't any more + if (as68_flag && (*tok == SYMBOL && tok[2] == ':')) { - as68mode = 0; + if (HandleLabel(label, labtyp) != 0) + goto loop; - if (*tok == SYMBOL && tok[2] == ':') - { - as68mode = 1; - goto do_label; - } + label_defined = label; + + goto as68label; } } - if (*tok == EOL) // EOL is legal here... + // EOL is legal here... + if (*tok == EOL) goto normal; - // Next token MUST be a symbol + // First token MUST be a symbol (if we get here, tok didn't advance) if (*tok++ != SYMBOL) { - error(syntax_error); + error("syntax error; expected symbol"); goto loop; } -// This is the problem here: On 64-bit platforms, this cuts the native pointer -// in half. We need to figure out how to fix this. -//#warning "!!! Bad pointer !!!" -#if 0 - opname = p = (char *)*tok++; // Store opcode name here -#else opname = p = string[*tok++]; -#endif // Check to see if the SYMBOL is a keyword (a mnemonic or directive). // On output, `state' will have one of the values: @@ -260,12 +285,17 @@ as68label: // Check for ".b" ".w" ".l" after directive, macro or mnemonic. siz = SIZN; - if (*tok == DOTW) - siz = SIZW, ++tok; - else if (*tok == DOTL) - siz = SIZL, ++tok; - else if (*tok == DOTB) - siz = SIZB, ++tok; + switch (*tok) + { + case DOTW: siz = SIZW, tok++; break; + case DOTL: siz = SIZL, tok++; break; + case DOTB: siz = SIZB, tok++; break; + case DOTD: siz = SIZD, tok++; break; + case DOTP: siz = SIZP, tok++; break; + case DOTQ: siz = SIZQ, tok++; break; + case DOTS: siz = SIZS, tok++; break; + case DOTX: siz = SIZX, tok++; break; + } // Do special directives (500..999) (These must be handled in "real time") if (state >= 500 && state < 1000) @@ -273,14 +303,17 @@ as68label: switch (state) { case MN_IF: - d_if (); - goto loop; + d_if(); + goto loop; + case MN_ELSE: d_else(); goto loop; + case MN_ENDIF: - d_endif (); + d_endif(); goto loop; + case MN_IIF: // .iif --- immediate if if (disabled || expr(exprbuf, &eval, &eattr, &esym) != OK) goto loop; @@ -301,9 +334,11 @@ as68label: goto loop; goto loop1; + case MN_MACRO: // .macro --- macro definition if (!disabled) { + // Label on a macro definition is bad mojo... Warn the user if (label != NULL) warn(lab_ignored); @@ -311,6 +346,7 @@ as68label: } goto loop; + case MN_EXITM: // .exitm --- exit macro case MN_ENDM: // .endm --- same as .exitm if (!disabled) @@ -322,16 +358,24 @@ as68label: } goto loop; + case MN_REPT: if (!disabled) { - if (label != NULL) - warn(lab_ignored); + // Handle labels on REPT directive lines... + if (label) + { + if (HandleLabel(label, labtyp) != 0) + goto loop; - defrept(); + label_defined = label; + } + + HandleRept(); } goto loop; + case MN_ENDR: if (!disabled) error("mis-nested .endr"); @@ -347,11 +391,8 @@ normal: // Do equates if (equate != NULL) { - j = 0; // Pick global or local sym enviroment - - if (*equate == '.') - j = curenv; - + // Pick global or local symbol enviroment + j = (*equate == '.' ? curenv : 0); sy = lookup(equate, LABEL, j); if (sy == NULL) @@ -375,24 +416,23 @@ normal: { if ((equtyp == EQUREG) && (sy->sattre & UNDEF_EQUR)) { - sy->sattre |= ~UNDEF_EQUR; - sy->svalue = 0; + sy->sattre &= ~UNDEF_EQUR; + sy->svalue = 0; } else if ((equtyp == CCDEF) && (sy->sattre & UNDEF_CC)) { - sy->sattre |= ~UNDEF_CC; + sy->sattre &= ~UNDEF_CC; sy->svalue = 0; } else { - errors("multiple equate to '%s'", sy->sname); + error("multiple equate to '%s'", sy->sname); goto loop; } } - // Put symbol in "order of definition" list - if (!(sy->sattr & SDECLLIST)) - sym_decl(sy); + // Put symbol in "order of definition" list if it's not already there + AddToSymbolDeclarationList(sy); // Parse value to equate symbol to; // o .equr @@ -400,6 +440,14 @@ normal: // o everything else if (equtyp == EQUREG) { +//Linko's request to issue a warning on labels that equated to the same +//register would go here. Not sure how to implement it though. :-/ +/* +Maybe like this way: +have an array of bools with 64 entries. Whenever a register is equated, set the +corresponding register bool to true. Whenever it's undef'ed, set it to false. +When checking to see if it's already been equated, issue a warning. +*/ // Check that we are in a RISC section if (!rgpu && !rdsp) { @@ -410,35 +458,55 @@ normal: // Check for register to equate to if ((*tok >= KW_R0) && (*tok <= KW_R31)) { - sy->sattre = EQUATEDREG | RISCSYM; // Mark as equated register +// sy->sattre = EQUATEDREG | RISCSYM; // Mark as equated register + sy->sattre = EQUATEDREG; // Mark as equated register riscreg = (*tok - KW_R0); - sy->sattre |= (riscreg << 8); // Store register number +//is there any reason to do this, since we're putting this in svalue? +//i'm thinking, no. Let's test that out! :-D +// sy->sattre |= (riscreg << 8); // Store register number +//everything seems to build fine without it... We'll leave it here Just In Case(tm) + +#define DEBODGE_REGBANK +#ifdef DEBODGE_REGBANK + // Default is current state of "regbank" + registerbank = regbank; +#else + // Default is no register bank specified + registerbank = BANK_N; +#endif + // Check for "," override notation if ((tok[1] == ',') && (tok[2] == CONST)) { + // Advance token pointer to the constant tok += 3; - if (*tok == 0) + // Anything other than a 0 or a 1 will result in "No Bank" + if (*(uint64_t *)tok == 0) registerbank = BANK_0; - else if (*tok == 1) + else if (*(uint64_t *)tok == 1) registerbank = BANK_1; - else - registerbank = BANK_N; - } - else - { - registerbank = BANK_N; } +#ifdef DEBODGE_REGBANK + sy->sattre |= registerbank; // Store register bank +#else +// What needs to happen here is to prime registerbank with regbank, then use +// registerbank down below for the bank marking. +#warning "!!! regbank <-> registerbank confusion here !!!" +// The question here is why, if we're allowed to override the ".regbankN" rules +// above, then why is it using the one set by the directive in the extended +// attributes and not in what ends up in symbol->svalue? +// ".regbankN" is not an original Madmac directive, so it's suspect sy->sattre |= regbank; // Store register bank +#endif eattr = ABS | DEFINED | GLOBAL; - eval = 0x80000080 + (riscreg) + (registerbank << 8); + eval = riscreg; tok++; } // Checking for a register symbol else if (tok[0] == SYMBOL) { -// sy2 = lookup((char *)tok[1], LABEL, j); sy2 = lookup(string[tok[1]], LABEL, j); // Make sure symbol is a valid equreg @@ -466,7 +534,7 @@ normal: if (reglist(&rmask) < 0) goto loop; - eval = (VALUE)rmask; + eval = (uint32_t)rmask; eattr = ABS | DEFINED; } else if (equtyp == CCDEF) @@ -476,7 +544,6 @@ normal: if (tok[0] == SYMBOL) { -// sy2 = lookup((char *)tok[1], LABEL, j); sy2 = lookup(string[tok[1]], LABEL, j); if (!sy2 || !(sy2->sattre & EQUATEDCC)) @@ -495,10 +562,9 @@ normal: else if (expr(exprbuf, &eval, &eattr, &esym) != OK) goto loop; } - //equ a equr + // equ an equr else if (*tok == SYMBOL) { -// sy2 = lookup((char *)tok[1], LABEL, j); sy2 = lookup(string[tok[1]], LABEL, j); if (sy2 && (sy2->sattre & EQUATEDREG)) @@ -506,7 +572,7 @@ normal: sy->stype = sy2->stype; sy->sattr = sy2->sattr; sy->sattre = sy2->sattre; - sy->svalue = (sy2->svalue & 0xFFFFF0FF); + sy->svalue = sy2->svalue; goto loop; } else if (expr(exprbuf, &eval, &eattr, &esym) != OK) @@ -521,95 +587,139 @@ normal: goto loop; } - sy->sattr |= eattr | EQUATED; // Symbol inherits value and attributes + sy->sattr |= eattr | EQUATED; // Symbol inherits value and attributes sy->svalue = eval; - if (list_flag) // Put value in listing - listvalue(eval); + if (list_flag) // Put value in listing + listvalue((uint32_t)eval); - at_eol(); // Must be at EOL now + ErrorIfNotAtEOL(); // Must be at EOL now goto loop; } // Do labels if (label != NULL) { -do_label: - // Check for dot in front of label; means this is a local label if present -#if 0 - j = 0; + // Non-zero == error occurred + if (HandleLabel(label, labtyp) != 0) + goto loop; - if (*label == '.') - j = curenv; -#else - j = (*label == '.' ? curenv : 0); -#endif + label_defined = label; + } - sy = lookup(label, LABEL, j); + // Punt on EOL + if (state == -3) + goto loop; - if (sy == NULL) + // If we're in 6502 mode and are still in need of a mnemonic, then search + // for valid 6502 mnemonic. + if (m6502 && (state < 0 || state >= 1000)) + { +#ifdef ST + state = kmatch(opname, mpbase, mpcheck, mptab, mpaccept); +#else + for(state=0, p=opname; state>= 0; ) { - sy = NewSymbol(label, LABEL, j); - sy->sattr = 0; - sy->sattre = RISCSYM; + j = mpbase[state] + tolowertab[*p]; + + if (mpcheck[j] != state) // Reject, character doesn't match + { + state = -1; // No match + break; + } + + if (!*++p) + { // Must accept or reject at EOS + state = mpaccept[j]; // (-1 on no terminal match) + break; + } + + state = mptab[j]; } - else if (sy->sattr & DEFINED) +#endif + + // Call 6502 code generator if we found a mnemonic + if (state >= 2000) { - errors("multiply-defined label '%s'", label); + m6502cg(state - 2000); goto loop; } + } - // Put symbol in "order of definition" list - if (!(sy->sattr & SDECLLIST)) - sym_decl(sy); - - if (orgactive) + // If we are in GPU or DSP mode and still in need of a mnemonic then search + // for one + if ((rgpu || rdsp) && (state < 0 || state >= 1000)) + { + for(state=0, p=opname; state>=0;) { - sy->svalue = orgaddr; - sy->sattr |= ABS | DEFINED | EQUATED; + j = mrbase[state] + (int)tolowertab[*p]; + + // Reject, character doesn't match + if (mrcheck[j] != state) + { + state = -1; // No match + break; + } + + // Must accept or reject at EOS + if (!*++p) + { + state = mraccept[j]; // (-1 on no terminal match) + break; + } + + state = mrtab[j]; } - else + + // Call RISC code generator if we found a mnemonic + if (state >= 3000) { - sy->svalue = sloc; - sy->sattr |= DEFINED | cursect; + GenerateRISCCode(state); + goto loop; } + } - lab_sym = sy; + // If we are in OP mode and still in need of a mnemonic then search for one + if (robjproc && ((state < 0) || (state >= 1000))) + { + for(state=0, p=opname; state>=0;) + { + j = mobase[state] + (int)tolowertab[*p]; - if (!j) - curenv++; + // Reject, character doesn't match + if (mocheck[j] != state) + { + state = -1; // No match + break; + } - // Make label global - if (labtyp == DCOLON) - { - if (j) + // Must accept or reject at EOS + if (!*++p) { - error(locgl_error); - goto loop; + state = moaccept[j]; // (-1 on no terminal match) + break; } - sy->sattr |= GLOBAL; + state = motab[j]; } - // If we're in as68 mode, and there's another label, go back and handle it - if (as68_flag && as68mode) - goto as68label; + // Call OP code generator if we found a mnemonic + if (state >= 3100) + { + GenerateOPCode(state); + goto loop; + } } - // Punt on EOL - if (state == -3) - goto loop; - - // If we are in GPU or DSP mode and still in need of a mnemonic then search - // for one - if ((rgpu || rdsp) && (state < 0 || state >= 1000)) + // If we are in 56K mode and still in need of a mnemonic then search for one + if (dsp56001 && ((state < 0) || (state >= 1000))) { for(state=0, p=opname; state>=0;) { - j = mrbase[state] + (int)tolowertab[*p]; + j = dspbase[state] + (int)tolowertab[*p]; // Reject, character doesn't match - if (mrcheck[j] != state) + if (dspcheck[j] != state) { state = -1; // No match break; @@ -618,17 +728,72 @@ do_label: // Must accept or reject at EOS if (!*++p) { - state = mraccept[j]; // (-1 on no terminal match) + state = dspaccept[j]; // (-1 on no terminal match) break; } - state = mrtab[j]; + state = dsptab[j]; } - // Call RISC code generator if we found a mnemonic - if (state >= 3000) + // Call DSP code generator if we found a mnemonic + if (state >= 2000) { - GenerateRISCCode(state); + LONG parcode; + int operands; + MNTABDSP * md = &dsp56k_machtab[state - 2000]; + deposit_extra_ea = 0; // Assume no extra word needed + + if (md->mnfunc == dsp_mult) + { + // Special case for multiplication instructions: they require + // 3 operands + if ((operands = dsp_amode(3)) == ERROR) + goto loop; + } + else if ((md->mnattr & PARMOVE) && md->mn0 != M_AM_NONE) + { + if (dsp_amode(2) == ERROR) + goto loop; + } + else if ((md->mnattr & PARMOVE) && md->mn0 == M_AM_NONE) + { + // Instructions that have parallel moves but use no operands + // (probably only move). In this case, don't parse addressing + // modes--just go straight to parallel parse + dsp_am0 = dsp_am1 = M_AM_NONE; + } + else + { + // Non parallel move instructions can have up to 4 parameters + // (well, only tcc instructions really) + if ((operands = dsp_amode(4)) == ERROR) + goto loop; + + if (operands == 4) + { + dsp_tcc4(md->mninst); + goto loop; + } + } + + if (md->mnattr & PARMOVE) + { + // Check for parallel moves + if ((parcode = parmoves(dsp_a1reg)) == ERROR) + goto loop; + } + else + { + if (*tok != EOL) + error("parallel moves not allowed with this instruction"); + + parcode = 0; + } + + while ((dsp_am0 & md->mn0) == 0 || (dsp_am1 & md->mn1) == 0) + md = &dsp56k_machtab[md->mncont]; + + (*md->mnfunc)(md->mninst | (parcode << 8)); goto loop; } } @@ -636,10 +801,10 @@ do_label: // Invoke macro or complain about bad mnemonic if (state < 0) { - if ((sy = lookup(opname, MACRO, 0)) != NULL) + if ((sy = lookup(opname, MACRO, 0)) != NULL) InvokeMacro(sy, siz); else - errors("unknown op '%s'", opname); + error("unknown op '%s'", opname); goto loop; } @@ -652,20 +817,20 @@ do_label: } // Do mnemonics - // o can't deposit instrs in BSS or ABS - // o do automatic .EVEN for instrs - // o allocate space for largest possible instr - // o can't do ".b" operations with an address register + // o can't deposit instrs in BSS or ABS + // o do automatic .EVEN for instrs + // o allocate space for largest possible instr + // o can't do ".b" operations with an address register if (scattr & SBSS) { error("cannot initialize non-storage (BSS) section"); goto loop; } - if (sloc & 1) // Automatic .even + if (sloc & 1) // Automatic .even auto_even(); - if (challoc - ch_size < 18) // Make sure have space in current chunk + if (challoc - ch_size < 18) // Make sure have space in current chunk chcheck(0); m = &machtab[state - 1000]; @@ -677,7 +842,7 @@ do_label: goto loop; } - if (amode(1) < 0) // Parse 0, 1 or 2 addr modes + if (amode(1) < 0) // Parse 0, 1 or 2 addr modes goto loop; if (*tok != EOL) @@ -694,89 +859,67 @@ do_label: goto loop; } - for(;;) - { - if ((m->mnattr & siz) && (amsk0 & m->mn0) != 0 && (amsk1 & m->mn1) != 0) - { - (*m->mnfunc)(m->mninst, siz); - goto loop; - } + // Keep a backup of chptr (used for optimisations during codegen) + chptr_opcode = chptr; + while (!(m->mnattr & siz) || (amsk0 & m->mn0) == 0 || (amsk1 & m->mn1) == 0) m = &machtab[m->mncont]; - } + + DEBUG { printf(" 68K: mninst=$%X, siz=$%X, mnattr=$%X, amsk0=$%X, mn0=$%X, amsk1=$%X, mn1=$%X\n", m->mninst, siz, m->mnattr, amsk0, m->mn0, amsk1, m->mn1); } + + (*m->mnfunc)(m->mninst, siz); + goto loop; } -// -// .if, Start Conditional Assembly // -int d_if(void) +// Handle the creation of labels +// +int HandleLabel(char * label, int labelType) { - IFENT * rif; - WORD eattr; - VALUE eval; - SYM * esym; - - // Alloc an IFENTRY - if ((rif = f_ifent) == NULL) - rif = (IFENT *)malloc(sizeof(IFENT)); - else - f_ifent = rif->if_prev; - - rif->if_prev = ifent; - ifent = rif; + // Check for dot in front of label; means this is a local label if present + int environment = (*label == '.' ? curenv : 0); + SYM * symbol = lookup(label, LABEL, environment); - if (!disabled) + if (symbol == NULL) { - if (expr(exprbuf, &eval, &eattr, &esym) != OK) - return 0; - - if ((eattr & DEFINED) == 0) - return error(undef_error); - - disabled = !eval; + symbol = NewSymbol(label, LABEL, environment); + symbol->sattr = 0; + symbol->sattre = 0; } + else if (symbol->sattr & DEFINED) + return error("multiply-defined label '%s'", label); - rif->if_state = (WORD)disabled; - return 0; -} - - -// -// .else, Do Alternate Case For .if -// -int d_else(void) -{ - IFENT * rif = ifent; - - if (rif->if_prev == NULL) - return error("mismatched .else"); + // Put symbol in "order of definition" list if it's not already in it + AddToSymbolDeclarationList(symbol); - if (disabled) - disabled = rif->if_prev->if_state; + if (orgactive) + { + symbol->svalue = orgaddr; + symbol->sattr |= ABS | DEFINED | EQUATED; + } else - disabled = 1; + { + symbol->svalue = sloc; + symbol->sattr |= DEFINED | cursect; + } - rif->if_state = (WORD)disabled; - return 0; -} + lab_sym = symbol; + // Yes, our CS professors told us to write checks for equality this way, + // but damn, it hurts my brain every time I look at it. :-/ + if (0 == environment) + curenv++; -// -// .endif, End of conditional assembly block -// This is also called by fpop() to pop levels of IFENTs in case a macro or -// include file exits early with `exitm' or `end'. -// -int d_endif (void) -{ - IFENT * rif = ifent; + // Make label global if it has a double colon + if (labelType == DCOLON) + { + if (environment != 0) + return error(locgl_error); - if (rif->if_prev == NULL) - return error("mismatched .endif"); + symbol->sattr |= GLOBAL; + } - ifent = rif->if_prev; - disabled = rif->if_prev->if_state; - rif->if_prev = f_ifent; - f_ifent = rif; return 0; } +