1: /* $Header: cmd.c,v 1.0.1.1 88/01/21 21:24:16 root Exp $ 2: * 3: * $Log: cmd.c,v $ 4: * Revision 1.0.1.1 88/01/21 21:24:16 root 5: * The redo cmd got a segmentation fault because trace context stack overflowed. 6: * 7: * Revision 1.0 87/12/18 13:04:51 root 8: * Initial revision 9: * 10: */ 11: 12: #include "handy.h" 13: #include "EXTERN.h" 14: #include "search.h" 15: #include "util.h" 16: #include "perl.h" 17: 18: static STR str_chop; 19: 20: /* This is the main command loop. We try to spend as much time in this loop 21: * as possible, so lots of optimizations do their activities in here. This 22: * means things get a little sloppy. 23: */ 24: 25: STR * 26: cmd_exec(cmd) 27: register CMD *cmd; 28: { 29: SPAT *oldspat; 30: #ifdef DEBUGGING 31: int olddlevel; 32: int entdlevel; 33: #endif 34: register STR *retstr; 35: register char *tmps; 36: register int cmdflags; 37: register bool match; 38: register char *go_to = goto_targ; 39: ARG *arg; 40: FILE *fp; 41: 42: retstr = &str_no; 43: #ifdef DEBUGGING 44: entdlevel = dlevel; 45: #endif 46: tail_recursion_entry: 47: #ifdef DEBUGGING 48: dlevel = entdlevel; 49: #endif 50: if (cmd == Nullcmd) 51: return retstr; 52: cmdflags = cmd->c_flags; /* hopefully load register */ 53: if (go_to) { 54: if (cmd->c_label && strEQ(go_to,cmd->c_label)) 55: goto_targ = go_to = Nullch; /* here at last */ 56: else { 57: switch (cmd->c_type) { 58: case C_IF: 59: oldspat = curspat; 60: #ifdef DEBUGGING 61: olddlevel = dlevel; 62: #endif 63: retstr = &str_yes; 64: if (cmd->ucmd.ccmd.cc_true) { 65: #ifdef DEBUGGING 66: debname[dlevel] = 't'; 67: debdelim[dlevel++] = '_'; 68: #endif 69: retstr = cmd_exec(cmd->ucmd.ccmd.cc_true); 70: } 71: if (!goto_targ) { 72: go_to = Nullch; 73: } else { 74: retstr = &str_no; 75: if (cmd->ucmd.ccmd.cc_alt) { 76: #ifdef DEBUGGING 77: debname[dlevel] = 'e'; 78: debdelim[dlevel++] = '_'; 79: #endif 80: retstr = cmd_exec(cmd->ucmd.ccmd.cc_alt); 81: } 82: } 83: if (!goto_targ) 84: go_to = Nullch; 85: curspat = oldspat; 86: #ifdef DEBUGGING 87: dlevel = olddlevel; 88: #endif 89: break; 90: case C_BLOCK: 91: case C_WHILE: 92: if (!(cmdflags & CF_ONCE)) { 93: cmdflags |= CF_ONCE; 94: loop_ptr++; 95: loop_stack[loop_ptr].loop_label = cmd->c_label; 96: #ifdef DEBUGGING 97: if (debug & 4) { 98: deb("(Pushing label #%d %s)\n", 99: loop_ptr,cmd->c_label); 100: } 101: #endif 102: } 103: switch (setjmp(loop_stack[loop_ptr].loop_env)) { 104: case O_LAST: /* not done unless go_to found */ 105: go_to = Nullch; 106: retstr = &str_no; 107: #ifdef DEBUGGING 108: olddlevel = dlevel; 109: #endif 110: curspat = oldspat; 111: #ifdef DEBUGGING 112: if (debug & 4) { 113: deb("(Popping label #%d %s)\n",loop_ptr, 114: loop_stack[loop_ptr].loop_label); 115: } 116: #endif 117: loop_ptr--; 118: cmd = cmd->c_next; 119: goto tail_recursion_entry; 120: case O_NEXT: /* not done unless go_to found */ 121: go_to = Nullch; 122: goto next_iter; 123: case O_REDO: /* not done unless go_to found */ 124: go_to = Nullch; 125: goto doit; 126: } 127: oldspat = curspat; 128: #ifdef DEBUGGING 129: olddlevel = dlevel; 130: #endif 131: if (cmd->ucmd.ccmd.cc_true) { 132: #ifdef DEBUGGING 133: debname[dlevel] = 't'; 134: debdelim[dlevel++] = '_'; 135: #endif 136: cmd_exec(cmd->ucmd.ccmd.cc_true); 137: } 138: if (!goto_targ) { 139: go_to = Nullch; 140: goto next_iter; 141: } 142: #ifdef DEBUGGING 143: dlevel = olddlevel; 144: #endif 145: if (cmd->ucmd.ccmd.cc_alt) { 146: #ifdef DEBUGGING 147: debname[dlevel] = 'a'; 148: debdelim[dlevel++] = '_'; 149: #endif 150: cmd_exec(cmd->ucmd.ccmd.cc_alt); 151: } 152: if (goto_targ) 153: break; 154: go_to = Nullch; 155: goto finish_while; 156: } 157: cmd = cmd->c_next; 158: if (cmd && cmd->c_head == cmd) /* reached end of while loop */ 159: return retstr; /* targ isn't in this block */ 160: goto tail_recursion_entry; 161: } 162: } 163: 164: until_loop: 165: 166: #ifdef DEBUGGING 167: if (debug & 2) { 168: deb("%s (%lx) r%lx t%lx a%lx n%lx cs%lx\n", 169: cmdname[cmd->c_type],cmd,cmd->c_expr, 170: cmd->ucmd.ccmd.cc_true,cmd->ucmd.ccmd.cc_alt,cmd->c_next,curspat); 171: } 172: debname[dlevel] = cmdname[cmd->c_type][0]; 173: debdelim[dlevel++] = '!'; 174: #endif 175: while (tmps_max >= 0) /* clean up after last eval */ 176: str_free(tmps_list[tmps_max--]); 177: 178: /* Here is some common optimization */ 179: 180: if (cmdflags & CF_COND) { 181: switch (cmdflags & CF_OPTIMIZE) { 182: 183: case CFT_FALSE: 184: retstr = cmd->c_first; 185: match = FALSE; 186: if (cmdflags & CF_NESURE) 187: goto maybe; 188: break; 189: case CFT_TRUE: 190: retstr = cmd->c_first; 191: match = TRUE; 192: if (cmdflags & CF_EQSURE) 193: goto flipmaybe; 194: break; 195: 196: case CFT_REG: 197: retstr = STAB_STR(cmd->c_stab); 198: match = str_true(retstr); /* => retstr = retstr, c2 should fix */ 199: if (cmdflags & (match ? CF_EQSURE : CF_NESURE)) 200: goto flipmaybe; 201: break; 202: 203: case CFT_ANCHOR: /* /^pat/ optimization */ 204: if (multiline) { 205: if (*cmd->c_first->str_ptr && !(cmdflags & CF_EQSURE)) 206: goto scanner; /* just unanchor it */ 207: else 208: break; /* must evaluate */ 209: } 210: /* FALL THROUGH */ 211: case CFT_STROP: /* string op optimization */ 212: retstr = STAB_STR(cmd->c_stab); 213: if (*cmd->c_first->str_ptr == *str_get(retstr) && 214: strnEQ(cmd->c_first->str_ptr, str_get(retstr), 215: cmd->c_flen) ) { 216: if (cmdflags & CF_EQSURE) { 217: match = !(cmdflags & CF_FIRSTNEG); 218: retstr = &str_yes; 219: goto flipmaybe; 220: } 221: } 222: else if (cmdflags & CF_NESURE) { 223: match = cmdflags & CF_FIRSTNEG; 224: retstr = &str_no; 225: goto flipmaybe; 226: } 227: break; /* must evaluate */ 228: 229: case CFT_SCAN: /* non-anchored search */ 230: scanner: 231: retstr = STAB_STR(cmd->c_stab); 232: if (instr(str_get(retstr),cmd->c_first->str_ptr)) { 233: if (cmdflags & CF_EQSURE) { 234: match = !(cmdflags & CF_FIRSTNEG); 235: retstr = &str_yes; 236: goto flipmaybe; 237: } 238: } 239: else if (cmdflags & CF_NESURE) { 240: match = cmdflags & CF_FIRSTNEG; 241: retstr = &str_no; 242: goto flipmaybe; 243: } 244: break; /* must evaluate */ 245: 246: case CFT_GETS: /* really a while (<file>) */ 247: last_in_stab = cmd->c_stab; 248: fp = last_in_stab->stab_io->fp; 249: retstr = defstab->stab_val; 250: if (fp && str_gets(retstr, fp)) { 251: last_in_stab->stab_io->lines++; 252: match = TRUE; 253: } 254: else if (last_in_stab->stab_io->flags & IOF_ARGV) 255: goto doeval; /* doesn't necessarily count as EOF yet */ 256: else { 257: retstr = &str_no; 258: match = FALSE; 259: } 260: goto flipmaybe; 261: case CFT_EVAL: 262: break; 263: case CFT_UNFLIP: 264: retstr = eval(cmd->c_expr,Null(char***)); 265: match = str_true(retstr); 266: if (cmd->c_expr->arg_type == O_FLIP) /* undid itself? */ 267: cmdflags = copyopt(cmd,cmd->c_expr[3].arg_ptr.arg_cmd); 268: goto maybe; 269: case CFT_CHOP: 270: retstr = cmd->c_stab->stab_val; 271: match = (retstr->str_cur != 0); 272: tmps = str_get(retstr); 273: tmps += retstr->str_cur - match; 274: str_set(&str_chop,tmps); 275: *tmps = '\0'; 276: retstr->str_nok = 0; 277: retstr->str_cur = tmps - retstr->str_ptr; 278: retstr = &str_chop; 279: goto flipmaybe; 280: } 281: 282: /* we have tried to make this normal case as abnormal as possible */ 283: 284: doeval: 285: retstr = eval(cmd->c_expr,Null(char***)); 286: match = str_true(retstr); 287: goto maybe; 288: 289: /* if flipflop was true, flop it */ 290: 291: flipmaybe: 292: if (match && cmdflags & CF_FLIP) { 293: if (cmd->c_expr->arg_type == O_FLOP) { /* currently toggled? */ 294: retstr = eval(cmd->c_expr,Null(char***)); /* let eval undo it */ 295: cmdflags = copyopt(cmd,cmd->c_expr[3].arg_ptr.arg_cmd); 296: } 297: else { 298: retstr = eval(cmd->c_expr,Null(char***)); /* let eval do it */ 299: if (cmd->c_expr->arg_type == O_FLOP) /* still toggled? */ 300: cmdflags = copyopt(cmd,cmd->c_expr[4].arg_ptr.arg_cmd); 301: } 302: } 303: else if (cmdflags & CF_FLIP) { 304: if (cmd->c_expr->arg_type == O_FLOP) { /* currently toggled? */ 305: match = TRUE; /* force on */ 306: } 307: } 308: 309: /* at this point, match says whether our expression was true */ 310: 311: maybe: 312: if (cmdflags & CF_INVERT) 313: match = !match; 314: if (!match && cmd->c_type != C_IF) { 315: cmd = cmd->c_next; 316: goto tail_recursion_entry; 317: } 318: } 319: 320: /* now to do the actual command, if any */ 321: 322: switch (cmd->c_type) { 323: case C_NULL: 324: fatal("panic: cmd_exec\n"); 325: case C_EXPR: /* evaluated for side effects */ 326: if (cmd->ucmd.acmd.ac_expr) { /* more to do? */ 327: retstr = eval(cmd->ucmd.acmd.ac_expr,Null(char***)); 328: } 329: break; 330: case C_IF: 331: oldspat = curspat; 332: #ifdef DEBUGGING 333: olddlevel = dlevel; 334: #endif 335: if (match) { 336: retstr = &str_yes; 337: if (cmd->ucmd.ccmd.cc_true) { 338: #ifdef DEBUGGING 339: debname[dlevel] = 't'; 340: debdelim[dlevel++] = '_'; 341: #endif 342: retstr = cmd_exec(cmd->ucmd.ccmd.cc_true); 343: } 344: } 345: else { 346: retstr = &str_no; 347: if (cmd->ucmd.ccmd.cc_alt) { 348: #ifdef DEBUGGING 349: debname[dlevel] = 'e'; 350: debdelim[dlevel++] = '_'; 351: #endif 352: retstr = cmd_exec(cmd->ucmd.ccmd.cc_alt); 353: } 354: } 355: curspat = oldspat; 356: #ifdef DEBUGGING 357: dlevel = olddlevel; 358: #endif 359: break; 360: case C_BLOCK: 361: case C_WHILE: 362: if (!(cmdflags & CF_ONCE)) { /* first time through here? */ 363: cmdflags |= CF_ONCE; 364: loop_ptr++; 365: loop_stack[loop_ptr].loop_label = cmd->c_label; 366: #ifdef DEBUGGING 367: if (debug & 4) { 368: deb("(Pushing label #%d %s)\n", 369: loop_ptr,cmd->c_label); 370: } 371: #endif 372: } 373: switch (setjmp(loop_stack[loop_ptr].loop_env)) { 374: case O_LAST: 375: retstr = &str_no; 376: curspat = oldspat; 377: #ifdef DEBUGGING 378: if (debug & 4) { 379: deb("(Popping label #%d %s)\n",loop_ptr, 380: loop_stack[loop_ptr].loop_label); 381: } 382: #endif 383: loop_ptr--; 384: cmd = cmd->c_next; 385: goto tail_recursion_entry; 386: case O_NEXT: 387: goto next_iter; 388: case O_REDO: 389: #ifdef DEBUGGING 390: dlevel = olddlevel; 391: #endif 392: goto doit; 393: } 394: oldspat = curspat; 395: #ifdef DEBUGGING 396: olddlevel = dlevel; 397: #endif 398: doit: 399: if (cmd->ucmd.ccmd.cc_true) { 400: #ifdef DEBUGGING 401: debname[dlevel] = 't'; 402: debdelim[dlevel++] = '_'; 403: #endif 404: cmd_exec(cmd->ucmd.ccmd.cc_true); 405: } 406: /* actually, this spot is never reached anymore since the above 407: * cmd_exec() returns through longjmp(). Hooray for structure. 408: */ 409: next_iter: 410: #ifdef DEBUGGING 411: dlevel = olddlevel; 412: #endif 413: if (cmd->ucmd.ccmd.cc_alt) { 414: #ifdef DEBUGGING 415: debname[dlevel] = 'a'; 416: debdelim[dlevel++] = '_'; 417: #endif 418: cmd_exec(cmd->ucmd.ccmd.cc_alt); 419: } 420: finish_while: 421: curspat = oldspat; 422: #ifdef DEBUGGING 423: dlevel = olddlevel - 1; 424: #endif 425: if (cmd->c_type != C_BLOCK) 426: goto until_loop; /* go back and evaluate conditional again */ 427: } 428: if (cmdflags & CF_LOOP) { 429: cmdflags |= CF_COND; /* now test the condition */ 430: goto until_loop; 431: } 432: cmd = cmd->c_next; 433: goto tail_recursion_entry; 434: } 435: 436: #ifdef DEBUGGING 437: /*VARARGS1*/ 438: deb(pat,a1,a2,a3,a4,a5,a6,a7,a8) 439: char *pat; 440: { 441: register int i; 442: 443: for (i=0; i<dlevel; i++) 444: fprintf(stderr,"%c%c ",debname[i],debdelim[i]); 445: fprintf(stderr,pat,a1,a2,a3,a4,a5,a6,a7,a8); 446: } 447: #endif 448: 449: copyopt(cmd,which) 450: register CMD *cmd; 451: register CMD *which; 452: { 453: cmd->c_flags &= CF_ONCE|CF_COND|CF_LOOP; 454: cmd->c_flags |= which->c_flags; 455: cmd->c_first = which->c_first; 456: cmd->c_flen = which->c_flen; 457: cmd->c_stab = which->c_stab; 458: return cmd->c_flags; 459: }
Defined functions
cmd_exec
defined in line 25; used 14 times
- in line 69, 80, 136, 150, 342, 352, 404, 418
- in /usr/src/new/PORT/perl.1.0.16/arg.c line 968, 1294
- in /usr/src/new/PORT/perl.1.0.16/cmd.h line 126
- in /usr/src/new/PORT/perl.1.0.16/perly.c line 220, 2517
- in /usr/src/new/PORT/perl.1.0.16/stab.c line 295
Defined variables
|
Last modified: 2002-12-19
Generated: 2016-12-26 |
Generated by src2html V0.67
page hit count: 4139 |
|