1: .title srch 2: .ident /03apr4/ 3: 4: .mcall (at)always,scan,genedt 5: .mcall (at)sdebug,ndebug 6: always 7: 8: .globl srchi 9: .globl search, next, scan, scanc, scanw 10: .globl append, insert, zap 11: .globl rolndx, rolupd, mactop , symbot 12: 13: .globl symovf 14: 15: .globl xmit0 16: .globl symlp, symhp, dumrol 17: .globl savreg, symbol 18: 19: .if df rsx11d 20: .globl ed.reg, edmask, symrol, regrol, cpopj 21: .endc 22: 23: xitsec ;start in default sector 24: 25: srchi: ;search init 26: mov #dumrol,r0 ;end of variable rolls 27: 1$: mov symhp,<^pl rolbas>(r0) ;point all to top 28: mov symhp,<^pl roltop>(r0) 29: clrb <^pl rolsiz>+1(r0) 30: sub #2,r0 ;get next lower 31: bge 1$ 32: mov symlp,mactop ;bottom is start of macros 33: add #bpmb-1,mactop ;must be even 34: bic #bpmb-1,mactop 35: mov symhp,symbot ;for sake of 'uplift' <<< REEDS 36: mov symhp,symlp ;symlp should always == symbot [debug, REEDS] 37: return 38: .if ndf rsx11d 39: 40: search: ;binary roll search 41: call setrol ;set roll registers 42: mov r3,-(sp) 43: sub r3,r1 ;point one slot low 44: mov r2,r3 45: sub r1,r3 ;compute size 46: clr r0 ;get set to compute search offset 47: sec ; (r0 doubles as t/f flag) 48: 1$: rol r0 ;shift bit 49: bic r0,r3 ;clear corresponding bit. last one? 50: bne 1$ ; no 51: 2$: add r0,r1 52: 3$: asr r0 ;end of iteration, halve offset 53: bic #2,r0 ;end? 54: beq 7$ ; yes 55: 4$: cmp r2,r1 ;off in no-mans's land? 56: blos 6$ ; yes 57: cmp (r4),(r1) ;no, first words match? 58: bne 5$ ; no 59: cmp 2(r4),2(r1) ;yes, how about second? 60: beq 8$ ; yes, found 61: 5$: bhi 2$ ;no, branch if too high 62: 6$: sub r0,r1 ;lower index 63: br 3$ 64: 65: 7$: cmp (r1)+,(r1)+ ;point to insertion slot 66: 8$: mov (sp)+,r3 67: br scanx ;exit through scan 68: .iff 69: 70: search: 71: call setrol 72: bit #ed.reg,edmask ;register definition enabled? 73: bne 10$ ;if ne no 74: cmp r5,#symrol ;symbol roll? 75: bne 10$ ;if ne no 76: bit #7,(r4) ;make ruff ruff test bypass 90% 77: bne 10$ ;if ne don't check for register 78: scan regrol ;scan register roll 79: mov r5,rolndx ;restore roll index 80: tst r0 ;find symbol? 81: beq 10$ ;if eq no find em 82: return ; 83: 10$: mov r1,-(sp) ;save roll base 84: cmp r1,r2 ;any in roll? 85: beq 5$ ;if eq no 86: sub r3,r2 ;calculate high and low bounds 87: mov r1,r0 ; 88: bic #177770,(sp) ; 89: 1$: mov r0,r1 ;calculate trial index 90: add r2,r1 ; 91: ror r1 ;halve result 92: bic #7,r1 ;clear garbage bits 93: bis (sp),r1 ; 94: cmp (r1),(r4) ;compare high parts 95: bhi 3$ ;if hi set new high limit 96: blo 2$ ;if lo set new low limit 97: cmp 2(r1),2(r4) ;compare low parts 98: beq 6$ ;if eq hit 99: bhi 3$ ;if hi set new high limit 100: 2$: mov r1,r0 ;set new low limit 101: add r3,r0 ;reduce by one more 102: cmp r0,r2 ;any more to search? 103: blos 1$ ;if los yes 104: add r3,r1 ;point to proper entry 105: br 5$ ;exit 106: 3$: mov r1,r2 ;se new high limit 107: sub r3,r2 ;reduce by one more 108: cmp r0,r2 ;any more to search? 109: blos 1$ ;if los yes 110: 5$: clr r0 ;set false flag 111: 6$: tst (sp)+ ;clean stack 112: br scanx ;vammoosa 113: 114: genedt reg 115: 116: .endc 117: next: ;get the next entry 118: call setrol 119: mov rolupd,r0 120: add r0,r1 121: add r3,r0 122: cmp r1,r2 123: blo scanx 124: br scanxf 125: 126: scanw: ;scan one word 127: call setrol ;set registers 128: clr r0 ;assume false 129: 1$: inc r0 ;tally entry count 130: cmp (r4),(r1) ;match? 131: beq scany ; yes 132: add r3,r1 ;no, increment pointer 133: cmp r1,r2 ;finished? 134: blo 1$ ; no 135: clr r0 136: return ;yes, exit false 137: 138: scanc: ;scan continuation 139: call setrof ;set regs 140: mov rolpnt,r1 ;get current pointer 141: add r3,r1 ;update 142: br scanf ;jump into middle 143: 144: scan: ;linear roll scan 145: call setrol ;set roll registers 146: scanf: clr r0 ;assume false 147: 1$: cmp r1,r2 ;end? 148: bhis scanxf ; yes, exit false 149: inc r0 150: cmp (r4),(r1) ;no, match on first words? 151: bne 2$ ; yes 152: cmp 2(r4),2(r1) ;no, how about second? 153: beq scanx ; yes 154: 2$: add r3,r1 ;increment by size 155: br 1$ 156: 157: .enabl lsb 158: scanxf: clr r0 ;false exit 159: scanx: mov r1,rolpnt ;set entry pointer 160: mov r0,rolupd ;save flag 161: beq 1$ ;branch if not found 162: scany: mov r4,r2 ;pointer to "symbol" 163: neg r3 ;negate entry size 164: jmp xmit0(r3) ;found, xfer arguments 165: 166: 1$: cmp (r4)+,(r4)+ ;bypass symbol itself 167: asr r3 ;get word count 168: sub #2,r3 ;compensate for above cmp 169: ble 3$ ;branch if end 170: 2$: clr (r4)+ ;clear word 171: sob r3,2$ 172: 3$: return 173: .dsabl lsb 174: append: ;append to end of roll 175: call setrol 176: mov r2,rolpnt ;set pointer 177: clr rolupd 178: br inserf 179: 180: insert: ;insert in roll 181: call setrof ;set roll registers (but no arg) 182: inserf: mov rolpnt,r0 ;points to proper slot 183: tst rolupd ;was search true? 184: bne 5$ ; yes 185: incb <^pl rolsiz>+1(r5) ;update entry count 186: add r3,<^pl roltop>(r5) ;update top pointer 187: cmp r2,<^pl rolbas>+2(r5) ;gap between rolls? 188: bne 5$ ; yes, just stuff it 189: mov <^pl rolbas>,r1 ;ditto for separate stack 190: mov r1,r2 191: sub r3,r2 192: mov r2,symbot 193: ;cmp r2,mactop ;room? 194: ;bhi 1$ ; yes 195: ;jmp symovf ;no, error 196: mov #symovf,upbomb ; where to go on error 197: call uplift 198: add upgap,r0 199: add upgap,r1 200: add upgap,r2 201: 202: ; fall through... 203: 1$: sub r1,r0 ;compute byte count 204: asr r0 ; now word count 205: beq 4$ ;branch if first time 206: 207: 2$: mov (r1)+,(r2)+ ;move an entry down 208: sob r0,2$ 209: 4$: sub r3,<^pl rolbas>(r5) ;decrement pointers 210: sub r3,<^pl roltop>(r5) 211: sub #2,r5 ;more rolls? 212: bge 4$ ; yes 213: mov r2,r0 ;point to insertion slot 214: 5$: asr r3 ;halve size count 215: 6$: mov (r4)+,(r0)+ ;move an entry into place 216: sob r3,6$ ;loop if not end 217: mov <^pl rolbas>,symbot 218: mov <^pl rolbas>,symlp 219: return 220: 221: 222: .globl $brkad, $brksy ; defined in exec.m11 223: 224: .globl putn 225: uplift:: ;<<< REEDS. move all the rolls up in core 226: ; can be called from 'insert' above and also 227: ; from 'getblk' in mac.m11. Thanks to Steve 228: ; Ragle for showing the need for a call from 229: ; otherwise growing macros can scribble. 230: ; And to Joel Rubin for debugging help. 231: .irpc xx,<0123> 232: mov r'xx,-(sp) 233: .endm 234: cmp symbot,mactop 235: blos 10$ 236: clr upgap 237: jmp 99$ 238: 10$: ; go here if symbot <= mactop 239: 240: mov symhp,upgap ; stash old highest in-space address 241: add #10102,symhp 242: bic #77,symhp ; click bic rounds to next highest mult of 64 243: 244: mov symhp,$brkad 245: trap 0 ; indirect 'brk' sys call 246: $brksy 247: bcc 1$ 248: jmp @upbomb ; error bail-out: symovf or macovf 249: 1$: 250: sub #2,symhp ; new highest in-space address 251: mov symhp,r0 252: mov upgap,r1 ; recall old highest address 253: mov r0,r3 254: sub r1,r3 ; r3 has the distance syms were shifted 255: mov symlp,r2 ; symlp is OLD bottom of symbols. 256: tst -(r2) ; r2 ==> word before old bottom 257: 2$: 258: mov (r1),(r0) 259: tst -(r1) 260: tst -(r0) 261: cmp r1,r2 262: bne 2$ 263: 264: 9$: mov r3,upgap ; how much the syms were lifted 265: mov #dumrol,r0 ; swiped from srchi 266: 3$: add r3,<^pl rolbas>(r0) 267: add r3,<^pl roltop>(r0) 268: sub #2,r0 269: bge 3$ 270: 271: add r3,rolpnt 272: add r3,symlp 273: mov symlp,symbot 274: tst rolupd 275: beq 30$ 276: add r3,rolupd 277: 30$: 278: 99$: 279: .irpc xx,<3210> 280: mov (sp)+,r'xx 281: .endm 282: return 283: 284: entsect mixed 285: upgap: .blkw 286: upbomb:: .blkw ; contains address of error handler 287: xitsec 288: zap: ;empty a roll 289: call setrol 290: mov r1,<^pl roltop>(r5) ;make top = bottom 291: clrb <^pl rolsiz>+1(r5) ;clear entry count 292: return 293: 294: 295: setrol: ;set roll registers 296: mov r0,rolndx ;set argument 297: setrof: mov (sp)+,r0 ;save return address 298: call savreg ;save registers 299: mov r5,-(sp) ; and current character 300: mov rolndx,r5 ;set index 301: mov <^pl rolbas>(r5),r1 ;current base 302: mov <^pl roltop>(r5),r2 ;current top 303: movb <^pl rolsiz>(r5),r3 ;entry size 304: mov #symbol,r4 ;pointer to symbol 305: call (r0) ;call proper routine 306: mov (sp)+,r5 ;restore current character 307: return ; and rest of regs 308: 309: entsec mixed 310: rolndx: .blkw ;roll index 311: rolpnt: .blkw ;roll pointer 312: rolupd: .blkw ;roll update 313: mactop: .blkw ;current top of macro storage 314: symbot: .blkw ;current bottom of dynamic rolls. 315: ; @mactop<=@symbot or uplift will fix it 316: xitsec 317: 318: .end
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