src/vm/jit/m68k/emit.c

   1 /* src/vm/jit/m68k/emit.c
   2
   3    Copyright (C) 1996-2005, 2006, 2007, 2008
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <assert.h>
  29
  30 #include "vm/jit/m68k/codegen.h"
  31 #include "vm/jit/m68k/emit.h"
  32
  33 #include "mm/memory.h"
  34
  35 #include "vm/builtin.h"
  36 #include "vm/exceptions.h"
  37
  38 #include "vm/jit/asmpart.h"
  39 #include "vm/jit/emit-common.h"
  40 #include "vm/jit/trace.hpp"
  41 #include "vm/jit/trap.h"
  42
  43
  44 /* emit_mov_imm_reg **************************************************************************
  45  *
  46  *      Loads an immededat operand into an integer data register
  47  *
  48  ********************************************************************************************/
  49 void emit_mov_imm_reg (codegendata *cd, s4 imm, s4 dreg)
  50 {
  51         /* FIXME: -1 can be used as byte form 0xff, but this ifs cascade is plain wrong it seems */
  52
  53         if ( (imm & 0x0000007F) == imm) {
  54                 /* use byte form */
  55                 *((s2*)cd->mcodeptr) = 0x7000 | (dreg << 9) | imm;      /* MOVEQ.L */
  56                 cd->mcodeptr += 2;
  57         } else if ((imm  & 0x00007FFF) == imm)  {
  58                 /* use word form */
  59                 OPWORD( ((7<<6) | (dreg << 3) | 5), 7, 4);                      /* MVS.W */
  60                 *((s2*)cd->mcodeptr) = (s2)imm;
  61                 cd->mcodeptr += 2;
  62         } else {
  63                 /* use long form */
  64                 OPWORD( ((2<<6) | (dreg << 3) | 0), 7, 4);
  65                 *((s4*)cd->mcodeptr) = (s4)imm;
  66                 cd->mcodeptr += 4;
  67
  68         }
  69 }
  70
  71 /* emit_copy *******************************************************************
  72
  73    Generates a register/memory to register/memory copy.
  74
  75 *******************************************************************************/
  76
  77 void emit_copy(jitdata *jd, instruction *iptr)
  78 {
  79         codegendata *cd;
  80         varinfo     *src;
  81         varinfo     *dst;
  82         s4           s1, d;
  83
  84         /* get required compiler data */
  85
  86         cd = jd->cd;
  87
  88         /* get source and destination variables */
  89
  90         src = VAROP(iptr->s1);
  91         dst = VAROP(iptr->dst);
  92
  93         if ((src->vv.regoff != dst->vv.regoff) ||
  94                 (IS_INMEMORY(src->flags ^ dst->flags))) {
  95
  96                 if ((src->type == TYPE_RET) || (dst->type == TYPE_RET)) {
  97                         /* emit nothing, as the value won't be used anyway */
  98                         return;
  99                 }
 100
 101                 /* If one of the variables resides in memory, we can eliminate
 102                    the register move from/to the temporary register with the
 103                    order of getting the destination register and the load. */
 104
 105                 if (IS_INMEMORY(src->flags)) {
 106                         if (IS_LNG_TYPE(src->type))
 107                                 d = codegen_reg_of_var(iptr->opc, dst, REG_ITMP12_PACKED);
 108                         else
 109                                 d = codegen_reg_of_var(iptr->opc, dst, REG_IFTMP);
 110
 111                         s1 = emit_load(jd, iptr, src, d);
 112                 }
 113                 else {
 114                         if (IS_LNG_TYPE(src->type))
 115                                 s1 = emit_load(jd, iptr, src, REG_ITMP12_PACKED);
 116                         else
 117                                 s1 = emit_load(jd, iptr, src, REG_IFTMP);
 118
 119                         d = codegen_reg_of_var(iptr->opc, dst, s1);
 120                 }
 121
 122                 if (s1 != d) {
 123                         switch(src->type)       {
 124                         case TYPE_INT: M_INTMOVE(s1, d); break;
 125                         case TYPE_ADR: M_ADRMOVE(s1, d); break;
 126                         case TYPE_LNG: M_LNGMOVE(s1, d); break;
 127 #if !defined(ENABLE_SOFTFLOAT)
 128                         case TYPE_FLT: M_FLTMOVE(s1, d); break;
 129                         case TYPE_DBL: M_DBLMOVE(s1, d); break;
 130 #else
 131                         case TYPE_FLT: M_INTMOVE(s1, d); break;
 132                         case TYPE_DBL: M_LNGMOVE(s1, d); break;
 133 #endif
 134                         default:
 135                                 vm_abort("emit_copy: unknown type %d", src->type);
 136                         }
 137                 }
 138
 139                 emit_store(jd, iptr, dst, d);
 140         }
 141 }
 142
 143
 144 /* emit_store ******************************************************************
 145
 146    Emits a possible store of the destination operand.
 147
 148 *******************************************************************************/
 149
 150 void emit_store(jitdata *jd, instruction *iptr, varinfo *dst, s4 d)
 151 {
 152         codegendata  *cd;
 153
 154         /* get required compiler data */
 155
 156         cd = jd->cd;
 157
 158         if (IS_INMEMORY(dst->flags)) {
 159                 COUNT_SPILLS;
 160
 161                 switch(dst->type)       {
 162 #if defined(ENABLE_SOFTFLOAT)
 163                         case TYPE_DBL:
 164 #endif
 165                         case TYPE_LNG:
 166                                 M_LST(d, REG_SP, dst->vv.regoff);
 167                                 break;
 168 #if defined(ENABLE_SOFTFLOAT)
 169                         case TYPE_FLT:
 170 #endif
 171                         case TYPE_INT:
 172                                 M_IST(d, REG_SP, dst->vv.regoff);
 173                                 break;
 174                         case TYPE_ADR:
 175                                 M_AST(d, REG_SP, dst->vv.regoff);
 176                                 break;
 177 #if !defined(ENABLE_SOFTFLOAT)
 178                         case TYPE_DBL:
 179                                 M_DST(d, REG_SP, dst->vv.regoff);
 180                                 break;
 181                         case TYPE_FLT:
 182                                 M_FST(d, REG_SP, dst->vv.regoff);
 183                                 break;
 184 #endif
 185                         default:
 186                                 vm_abort("emit_store: unknown type %d", dst->type);
 187                 }
 188         }
 189 }
 190
 191
 192 /* emit_load *******************************************************************
 193
 194    Emits a possible load of an operand.
 195
 196 *******************************************************************************/
 197
 198 s4 emit_load(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
 199 {
 200         codegendata *cd;
 201         s4           disp;
 202         s4           reg;
 203
 204         /* get required compiler data */
 205
 206         cd = jd->cd;
 207
 208         if (IS_INMEMORY(src->flags)) {
 209                 COUNT_SPILLS;
 210
 211                 disp = src->vv.regoff;
 212
 213                 switch (src->type)      {
 214 #if defined(ENABLE_SOFTFLOAT)
 215                         case TYPE_FLT:
 216 #endif
 217                         case TYPE_INT:
 218                                 M_ILD(tempreg, REG_SP, disp);
 219                                 break;
 220 #if defined(ENABLE_SOFTFLOAT)
 221                         case TYPE_DBL:
 222 #endif
 223                         case TYPE_LNG:
 224                                 M_LLD(tempreg, REG_SP, disp);
 225                                 break;
 226                         case TYPE_ADR:
 227                                 M_ALD(tempreg, REG_SP, disp);
 228                                 break;
 229 #if !defined(ENABLE_SOFTFLOAT)
 230                         case TYPE_FLT:
 231                                 M_FLD(tempreg, REG_SP, disp);
 232                                 break;
 233                         case TYPE_DBL:
 234                                 M_DLD(tempreg, REG_SP, disp);
 235                                 break;
 236 #endif
 237                         default:
 238                                 vm_abort("emit_load: unknown type %d", src->type);
 239                 }
 240                 #if 0
 241                 if (IS_FLT_DBL_TYPE(src->type)) {
 242                         if (IS_2_WORD_TYPE(src->type)) {
 243                                 M_DLD(tempreg, REG_SP, disp);
 244                          } else {
 245                                 M_FLD(tempreg, REG_SP, disp);
 246                         }
 247                 } else {
 248                         if (IS_2_WORD_TYPE(src->type)) {
 249                                 M_LLD(tempreg, REG_SP, disp);
 250                         } else {
 251                                 M_ILD(tempreg, REG_SP, disp);
 252                         }
 253                 }
 254                 #endif
 255
 256                 reg = tempreg;
 257         }
 258         else
 259                 reg = src->vv.regoff;
 260
 261         return reg;
 262 }
 263
 264 s4 emit_load_low(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
 265 {
 266         codegendata  *cd;
 267         s4            disp;
 268         s4            reg;
 269
 270 #if !defined(ENABLE_SOFTFLOAT)
 271         assert(src->type == TYPE_LNG);
 272 #else
 273         assert(src->type == TYPE_LNG || src->type == TYPE_DBL);
 274 #endif
 275
 276         /* get required compiler data */
 277         cd = jd->cd;
 278
 279         if (IS_INMEMORY(src->flags)) {
 280                 COUNT_SPILLS;
 281
 282                 disp = src->vv.regoff;
 283                 M_ILD(tempreg, REG_SP, disp + 4);
 284                 reg = tempreg;
 285         } else {
 286                 reg = GET_LOW_REG(src->vv.regoff);
 287         }
 288         return reg;
 289 }
 290 s4 emit_load_high(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
 291 {
 292         codegendata  *cd;
 293         s4            disp;
 294         s4            reg;
 295
 296 #if !defined(ENABLE_SOFTFLOAT)
 297         assert(src->type == TYPE_LNG);
 298 #else
 299         assert(src->type == TYPE_LNG || src->type == TYPE_DBL);
 300 #endif
 301         /* get required compiler data */
 302         cd = jd->cd;
 303
 304         if (IS_INMEMORY(src->flags)) {
 305                 COUNT_SPILLS;
 306                 disp = src->vv.regoff;
 307                 M_ILD(tempreg, REG_SP, disp);
 308                 reg = tempreg;
 309         } else {
 310                 reg = GET_HIGH_REG(src->vv.regoff);
 311         }
 312         return reg;
 313 }
 314 /* emit_branch *****************************************************************
 315
 316    Emits the code for conditional and unconditional branchs.
 317
 318 *******************************************************************************/
 319 void emit_branch(codegendata *cd, s4 disp, s4 condition, s4 reg, u4 opt)
 320 {
 321         /* calculate the different displacements */
 322         /* PC is a at branch instruction + 2 */
 323         /* coditional and uncondition branching work the same way */
 324         /* short branches have signed 16 bit offset */
 325         /* long branches are signed 32 bit */
 326         /* the 8 bit offset branching instructions are not used */
 327
 328         disp  =  disp - 2;
 329
 330         /* check displacement for overflow */
 331         if ((disp & 0x0000FFFF) != disp)        {
 332                 if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
 333                         cd->flags |= (CODEGENDATA_FLAG_ERROR | CODEGENDATA_FLAG_LONGBRANCHES);
 334                 }
 335         }
 336
 337         /* check which branch to generate */
 338
 339         if (condition == BRANCH_UNCONDITIONAL) {
 340                 if (CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd))      {
 341                         M_BR_32(disp);
 342                 } else  {
 343                         M_BR_16(disp);
 344                 }
 345         } else {
 346                 if (CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
 347                         switch (condition) {
 348                         case BRANCH_EQ:
 349                                 M_BEQ_32(disp);
 350                                 break;
 351                         case BRANCH_NE:
 352                                 M_BNE_32(disp);
 353                                 break;
 354                         case BRANCH_LT:
 355                                 M_BLT_32(disp);
 356                                 break;
 357                         case BRANCH_GE:
 358                                 M_BGE_32(disp);
 359                                 break;
 360                         case BRANCH_GT:
 361                                 M_BGT_32(disp);
 362                                 break;
 363                         case BRANCH_LE:
 364                                 M_BLE_32(disp);
 365                                 break;
 366                         case BRANCH_NAN:
 367                                 M_BNAN_32(disp);
 368                                 break;
 369                         case BRANCH_UGT:
 370                                 M_BHI_32(disp);
 371                                 break;
 372
 373                         default:
 374                                 vm_abort("emit_branch: unknown condition %d", condition);
 375                         }
 376                 } else {
 377                         switch (condition) {
 378                         case BRANCH_EQ:
 379                                 M_BEQ_16(disp);
 380                                 break;
 381                         case BRANCH_NE:
 382                                 M_BNE_16(disp);
 383                                 break;
 384                         case BRANCH_LT:
 385                                 M_BLT_16(disp);
 386                                 break;
 387                         case BRANCH_GE:
 388                                 M_BGE_16(disp);
 389                                 break;
 390                         case BRANCH_GT:
 391                                 M_BGT_16(disp);
 392                                 break;
 393                         case BRANCH_LE:
 394                                 M_BLE_16(disp);
 395                                 break;
 396                         case BRANCH_NAN:
 397                                 M_BNAN_16(disp);
 398                                 break;
 399                         case BRANCH_UGT:
 400                                 M_BHI_16(disp);
 401                                 break;
 402                         default:
 403                                 vm_abort("emit_branch: unknown condition %d", condition);
 404                         }
 405                 }
 406         }
 407 }
 408
 409
 410 #if !defined(NDEBUG)
 411 /*
 412  *      Trace functions. Implement -verbose:call flag
 413  *      code marked by real NOP, but performance is no matter when using -verbose:call :)
 414  */
 415 void emit_verbosecall_enter(jitdata* jd)
 416 {
 417         methodinfo   *m;
 418         codegendata  *cd;
 419         registerdata *rd;
 420         methoddesc   *md;
 421
 422         if (!JITDATA_HAS_FLAG_VERBOSECALL(jd))
 423                 return;
 424
 425         /* get required compiler data */
 426         m  = jd->m;
 427         cd = jd->cd;
 428         rd = jd->rd;
 429         md = m->parseddesc;
 430
 431         /* mark trace code */
 432         M_NOP;
 433
 434         M_IPUSH(REG_D0);
 435         M_IPUSH(REG_D1);
 436         M_APUSH(REG_A0);
 437         M_APUSH(REG_A1);
 438         M_AMOV(REG_SP, REG_A0); /* simpyfy stack offset calculation */
 439
 440 #if !defined(ENABLE_SOFTFLOAT)
 441         M_AADD_IMM(-8*2, REG_SP);
 442         M_FSTORE(REG_F0, REG_SP, 8);
 443         M_FSTORE(REG_F1, REG_SP, 0);
 444 #endif
 445
 446         M_AADD_IMM(4*4 + 4, REG_A0);
 447         M_APUSH(REG_A0);                /* third arg is original argument stack */
 448         M_IPUSH_IMM(0);                 /* second arg is number of argument registers (=0) */
 449         M_IPUSH_IMM(m);                 /* first arg is methodpointer */
 450
 451         M_JSR_IMM(trace_java_call_enter);
 452         /* pop arguments off stack */
 453         M_AADD_IMM(3*4, REG_SP);
 454
 455 #if !defined(ENABLE_SOFTFLOAT)
 456         M_FSTORE(REG_F1, REG_SP, 0);
 457         M_FSTORE(REG_F0, REG_SP, 8);
 458         M_AADD_IMM(8*2, REG_SP);
 459 #endif
 460
 461         M_APOP(REG_A1);
 462         M_APOP(REG_A0);
 463         M_IPOP(REG_D1);
 464         M_IPOP(REG_D0);
 465
 466         M_NOP;
 467 }
 468 void emit_verbosecall_exit(jitdata* jd)
 469 {
 470         methodinfo   *m;
 471         codegendata  *cd;
 472         registerdata *rd;
 473         methoddesc   *md;
 474
 475         if (!JITDATA_HAS_FLAG_VERBOSECALL(jd))
 476                 return;
 477
 478         /* get required compiler data */
 479         m  = jd->m;
 480         cd = jd->cd;
 481         rd = jd->rd;
 482         md = m->parseddesc;
 483
 484         /* void builtin_verbosecall_exit(s8 l, double d, float f, methodinfo *m); */
 485
 486     /* void trace_java_call_exit(methodinfo *m, uint64_t *return_regs) */
 487
 488         /* mark trace code */
 489         M_NOP;
 490
 491         /* to store result on stack */
 492         M_AADD_IMM(-8, REG_SP);                 /* create space for array */
 493
 494         switch (md->returntype.type)    {
 495                 case TYPE_ADR:
 496                 case TYPE_INT:
 497         #if defined(ENABLE_SOFTFLOAT)
 498                 case TYPE_FLT:
 499         #endif
 500                         M_IST(REG_D0, REG_SP, 0);
 501                         break;
 502
 503                 case TYPE_LNG:
 504         #if defined(ENABLE_SOFTFLOAT)
 505                 case TYPE_DBL:
 506         #endif
 507                         M_LST(REG_D1, REG_SP, 0);
 508                         break;
 509
 510         #if !defined(ENABLE_SOFTFLOAT)
 511                 case TYPE_FLT:  /* FIXME */
 512                 case TYPE_DBL:  /* FIXME */
 513         #endif
 514
 515                 case TYPE_VOID: /* nothing */
 516                         break;
 517
 518                 default:
 519                         assert(0);
 520         }
 521
 522         M_APUSH(REG_SP);                                /* push address of array */
 523         M_IPUSH_IMM(m);                                 /* push methodinfo */
 524         M_JSR_IMM(trace_java_call_exit);
 525
 526         M_AADD_IMM(8, REG_SP);                  /* remove args */
 527         /* poping result registers from stack */
 528         switch (md->returntype.type)    {
 529                 case TYPE_ADR:
 530                 case TYPE_INT:
 531         #if defined(ENABLE_SOFTFLOAT)
 532                 case TYPE_FLT:
 533         #endif
 534                         M_ILD(REG_D0, REG_SP, 0);
 535                         break;
 536
 537                 case TYPE_LNG:
 538         #if defined(ENABLE_SOFTFLOAT)
 539                 case TYPE_DBL:
 540         #endif
 541                         M_LLD(REG_D1, REG_SP, 0);
 542                         break;
 543
 544         #if !defined(ENABLE_SOFTFLOAT)
 545                 case TYPE_FLT:  /* FIXME */
 546                 case TYPE_DBL:  /* FIXME */
 547         #endif
 548
 549                 case TYPE_VOID: /* nothing */
 550                         break;
 551
 552                 default:
 553                         assert(0);
 554         }
 555
 556         M_AADD_IMM(8, REG_SP);                  /* remove space for array */
 557
 558         M_NOP;
 559 }
 560 #endif
 561
 562 /* emit_classcast_check ********************************************************
 563
 564    Emit a ClassCastException check.
 565
 566 *******************************************************************************/
 567
 568 void emit_classcast_check(codegendata *cd, instruction *iptr, s4 condition, s4 reg, s4 s1)
 569 {
 570         if (INSTRUCTION_MUST_CHECK(iptr)) {
 571                 switch (condition) {
 572                 case BRANCH_LE:
 573                         M_BGT(4);
 574                         break;
 575                 case BRANCH_EQ:
 576                         M_BNE(4);
 577                         break;
 578                 case BRANCH_GT:
 579                         M_BLE(4);
 580                         break;
 581                 case BRANCH_UGT:
 582                         M_BLS(4);
 583                         break;
 584                 default:
 585                         vm_abort("emit_classcast_check: unknown condition %d", condition);
 586                 }
 587                 M_TRAP_SETREGISTER(s1);
 588                 M_TRAP(TRAP_ClassCastException);
 589         }
 590 }
 591
 592 /* emit_arrayindexoutofbounds_check ********************************************
 593
 594    Emit a ArrayIndexOutOfBoundsException check.
 595
 596 *******************************************************************************/
 597 void emit_arrayindexoutofbounds_check(codegendata *cd, instruction *iptr, s4 s1, s4 s2)
 598 {
 599         if (INSTRUCTION_MUST_CHECK(iptr)) {
 600                 M_ILD(REG_ITMP3, s1, OFFSET(java_array_t, size));
 601                 M_ICMP(s2, REG_ITMP3);
 602                 M_BHI(4);
 603                 M_TRAP_SETREGISTER(s2);
 604                 M_TRAP(TRAP_ArrayIndexOutOfBoundsException);
 605         }
 606 }
 607
 608
 609 /* emit_arraystore_check *******************************************************
 610
 611    Emit an ArrayStoreException check.
 612
 613 *******************************************************************************/
 614
 615 void emit_arraystore_check(codegendata *cd, instruction *iptr)
 616 {
 617         if (INSTRUCTION_MUST_CHECK(iptr)) {
 618                 M_ITST(REG_RESULT);
 619                 M_BNE(2);
 620                 M_TRAP(TRAP_ArrayStoreException);
 621         }
 622 }
 623
 624
 625 /* emit_nullpointer_check ******************************************************
 626
 627    Emit a NullPointerException check.
 628
 629 *******************************************************************************/
 630
 631 void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
 632 {
 633         if (INSTRUCTION_MUST_CHECK(iptr)) {
 634                 /* XXX: this check is copied to call monitor_enter
 635                  * invocation at the beginning of codegen.c */
 636                 M_ATST(reg);
 637                 M_BNE(2);
 638                 M_TRAP(TRAP_NullPointerException);
 639         }
 640 }
 641
 642 /* emit_arithmetic_check *******************************************************
 643
 644    Emit an ArithmeticException check.
 645
 646 *******************************************************************************/
 647
 648 void emit_arithmetic_check(codegendata *cd, instruction *iptr, s4 reg)
 649 {
 650         if (INSTRUCTION_MUST_CHECK(iptr)) {
 651                 M_ITST(reg);
 652                 M_BNE(2);
 653                 M_TRAP(TRAP_ArithmeticException);
 654         }
 655 }
 656
 657 /* emit_exception_check_ireg **************************************************
 658
 659    Emit an Exception check. Teste register is integer REG_RESULT
 660
 661 *******************************************************************************/
 662 void emit_exception_check(codegendata *cd, instruction *iptr)
 663 {
 664         if (INSTRUCTION_MUST_CHECK(iptr)) {
 665                 M_ITST(REG_RESULT);
 666                 M_BNE(2);
 667                 M_TRAP(TRAP_CHECK_EXCEPTION);
 668         }
 669 }
 670
 671 /* emit_trap_compiler **********************************************************
 672
 673    Emit a trap instruction which calls the JIT compiler.
 674
 675 *******************************************************************************/
 676
 677 void emit_trap_compiler(codegendata *cd)
 678 {
 679         M_TRAP_SETREGISTER(REG_METHODPTR);
 680         M_TRAP(TRAP_COMPILER);
 681 }
 682
 683
 684 /* emit_trap *******************************************************************
 685
 686    Emit a trap instruction and return the original machine code.
 687
 688 *******************************************************************************/
 689
 690 uint32_t emit_trap(codegendata *cd)
 691 {
 692         uint32_t mcode;
 693
 694         /* Get machine code which is patched back in later. The
 695            trap is 2 bytes long. */
 696
 697         mcode = *((uint32_t *) cd->mcodeptr);
 698
 699         M_TRAP(TRAP_PATCHER);
 700
 701         return mcode;
 702 }
 703
 704
 705
 706 /*
 707  * These are local overrides for various environment variables in Emacs.
 708  * Please do not remove this and leave it at the end of the file, where
 709  * Emacs will automagically detect them.
 710  * ---------------------------------------------------------------------
 711  * Local variables:
 712  * mode: c
 713  * indent-tabs-mode: t
 714  * c-basic-offset: 4
 715  * tab-width: 4
 716  * End:
 717  * vim:noexpandtab:sw=4:ts=4:
 718  */