gen.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include "gen.h"
   4 #include "tok.h"
   5
   6 #define TMP_ADDR        0x0001
   7 #define LOC_REG         0x0100
   8 #define LOC_MEM         0x0200
   9 #define LOC_NUM         0x0400
  10 #define LOC_SYM         0x0800
  11 #define LOC_LOCAL       0x1000
  12 #define LOC_MASK        0xff00
  13
  14 #define R_RAX           0x00
  15 #define R_RCX           0x01
  16 #define R_RDX           0x02
  17 #define R_RBX           0x03
  18 #define R_RSP           0x04
  19 #define R_RBP           0x05
  20 #define R_RSI           0x06
  21 #define R_RDI           0x07
  22 #define R_R8            0x08
  23 #define R_R9            0x09
  24 #define R_R10           0x0a
  25 #define R_R11           0x0b
  26 #define R_R12           0x0c
  27 #define R_R13           0x0d
  28 #define R_R14           0x0e
  29 #define R_R15           0x0f
  30 #define NREGS           0x10
  31
  32 #define MOV_M2R         0x8b
  33 #define MOV_R2X         0x89
  34 #define MOV_I2X         0xc7
  35 #define MOV_I2R         0xb8
  36 #define ADD_R2X         0x03
  37 #define SUB_R2X         0x2b
  38 #define SHX_REG         0xd3
  39 #define CMP_R2X         0x3b
  40 #define LEA_M2R         0x8d
  41 #define NEG_REG         0xf7
  42 #define NOT_REG         0xf7
  43 #define CALL_REG        0xff
  44 #define MUL_A2X         0xf7
  45 #define XOR_R2X         0x33
  46 #define AND_R2X         0x23
  47 #define OR_R2X          0x0b
  48 #define TEST_R2R        0x85
  49
  50 #define R_BYTEMASK              (1 << R_RAX | 1 << R_RDX | 1 << R_RCX)
  51 #define TMP_BT(t)               ((t)->flags & TMP_ADDR ? 8 : (t)->bt)
  52 #define TMP_REG(t)              ((t)->flags & LOC_REG ? (t)->addr : reg_get(~0))
  53 #define TMP_REG2(t, r)          ((t)->flags & LOC_REG && (t)->addr != r ? \
  54                                         (t)->addr : reg_get(~(1 << r)))
  55 #define TMP_BYTEREG(t)          ((t)->flags & LOC_REG && \
  56                                  (1 << (t)->addr) & R_BYTEMASK ? \
  57                                         (t)->addr : reg_get(R_BYTEMASK))
  58 #define BT_TMPBT(bt)            (BT_SZ(bt) >= 4 ? (bt) : (bt) & BT_SIGNED | 4)
  59
  60 static char buf[SECSIZE];
  61 static char *cur;
  62 static int nogen;
  63 static long sp;
  64 static long spsub_addr;
  65 static long maxsp;
  66
  67 static struct tmp {
  68         long addr;
  69         unsigned flags;
  70         unsigned bt;
  71 } tmp[MAXTMP];
  72 static int ntmp;
  73
  74 static int tmpsp;
  75
  76 static struct tmp *regs[NREGS];
  77 static int tmpregs[] = {R_RAX, R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
  78
  79 #define MAXRET                  (1 << 8)
  80
  81 static long ret[MAXRET];
  82 static int nret;
  83
  84 static long cmp_last;
  85 static long cmp_setl;
  86
  87 static void putint(char *s, long n, int l)
  88 {
  89         if (nogen)
  90                 return;
  91         while (l--) {
  92                 *s++ = n;
  93                 n >>= 8;
  94         }
  95 }
  96
  97 static void os(char *s, int n)
  98 {
  99         if (nogen)
 100                 return;
 101         while (n--)
 102                 *cur++ = *s++;
 103 }
 104
 105 static void oi(long n, int l)
 106 {
 107         while (l--) {
 108                 *cur++ = n;
 109                 n >>= 8;
 110         }
 111 }
 112
 113 static long codeaddr(void)
 114 {
 115         return cur - buf;
 116 }
 117
 118 static void o_op(int *op, int nop, int r1, int r2, unsigned bt)
 119 {
 120         int rex = 0;
 121         int i;
 122         if (r1 & 0x8)
 123                 rex |= 4;
 124         if (r2 & 0x8)
 125                 rex |= 1;
 126         if (BT_SZ(bt) == 8)
 127                 rex |= 8;
 128         if (rex || (bt & BT_SZMASK) == 8)
 129                 oi(0x40 | rex, 1);
 130         if ((bt & BT_SZMASK) == 2)
 131                 oi(0x66, 1);
 132         if ((bt & BT_SZMASK) == 1)
 133                 op[nop - 1] &= ~0x1;
 134         for (i = 0; i < nop; i++)
 135                 oi(op[i], 1);
 136 }
 137
 138 static void memop(int *op, int nop, int src, int base, int off, unsigned bt)
 139 {
 140         int dis = off == (char) off ? 1 : 4;
 141         int mod = dis == 4 ? 2 : 1;
 142         o_op(op, nop, src, base, bt);
 143         if (!off)
 144                 mod = 0;
 145         oi((mod << 6) | ((src & 0x07) << 3) | (base & 0x07), 1);
 146         if (off)
 147                 oi(off, dis);
 148 }
 149
 150 static void memop1(int op, int src, int base, int off, unsigned bt)
 151 {
 152         memop(&op, 1, src, base, off, bt);
 153 }
 154
 155 static void regop(int *op, int nop, int src, int dst, unsigned bt)
 156 {
 157         o_op(op, nop, src, dst, bt);
 158         oi((3 << 6) | (src << 3) | (dst & 0x07), 1);
 159 }
 160
 161 static void regop1(int op, int src, int dst, unsigned bt)
 162 {
 163         regop(&op, 1, src, dst, bt);
 164 }
 165
 166 static long sp_push(int size)
 167 {
 168         sp += size;
 169         if (sp > maxsp)
 170                 maxsp = sp;
 171         return sp;
 172 }
 173
 174 #define LOC_NEW(f, l)           (((f) & ~LOC_MASK) | (l))
 175
 176 static void tmp_mem(struct tmp *tmp)
 177 {
 178         int src = tmp->addr;
 179         if (!(tmp->flags & LOC_REG))
 180                 return;
 181         if (tmpsp == -1)
 182                 tmpsp = sp;
 183         tmp->addr = sp_push(8);
 184         memop1(MOV_R2X, src, R_RBP, -tmp->addr, BT_TMPBT(TMP_BT(tmp)));
 185         regs[src] = NULL;
 186         tmp->flags = LOC_NEW(tmp->flags, LOC_MEM);
 187 }
 188
 189 static int *movxx_x2r(int bt)
 190 {
 191         static int movxx[2] = {0x0f};
 192         if (BT_SZ(bt) == 1)
 193                 movxx[1] = bt & BT_SIGNED ? 0xbe : 0xb6;
 194         else
 195                 movxx[1] = bt & BT_SIGNED ? 0xbf : 0xb7;
 196         return movxx;
 197 }
 198
 199 #define MOVSXD          0x63
 200
 201 static void mov_r2r(int r1, int r2, unsigned bt1, unsigned bt2)
 202 {
 203         int s1 = bt1 & BT_SIGNED;
 204         int s2 = bt2 & BT_SIGNED;
 205         int sz1 = BT_SZ(bt1);
 206         int sz2 = BT_SZ(bt2);
 207         if (sz2 < 4 && (sz1 >= sz2 && s1 != s2)) {
 208                 regop(movxx_x2r(bt2), 2, r1, r2, 4);
 209                 return;
 210         }
 211         if (sz1 == 4 && sz2 == 8) {
 212                 regop1(MOVSXD, r1, r2, sz2);
 213                 return;
 214         }
 215         if (r1 != r2 || sz1 > sz2)
 216                 regop1(MOV_R2X, r1, r2, BT_TMPBT(bt2));
 217 }
 218
 219 static void mov_m2r(int dst, int base, int off, int bt1, int bt2)
 220 {
 221         if (BT_SZ(bt1) < 4) {
 222                 memop(movxx_x2r(bt1), 2, dst, base, off,
 223                         bt1 & BT_SIGNED && BT_SZ(bt2) == 8 ? 8 : 4);
 224                 mov_r2r(dst, dst, bt1, bt2);
 225         } else {
 226                 memop1(MOV_M2R, dst, base, off, bt1);
 227                 mov_r2r(dst, dst, bt1, bt2);
 228         }
 229 }
 230
 231 static void num_cast(struct tmp *t, unsigned bt)
 232 {
 233         if (!(bt & BT_SIGNED) && BT_SZ(bt) != 8)
 234                 t->addr &= ((1l << (long) (BT_SZ(bt) * 8)) - 1);
 235         t->bt = bt;
 236 }
 237
 238 static void num_reg(int reg, unsigned bt, long num)
 239 {
 240         int op = MOV_I2R + (reg & 7);
 241         if (BT_SZ(bt) == 8 && num >= 0 && num == (unsigned) num)
 242                 bt = 4;
 243         o_op(&op, 1, 0, reg, bt);
 244         oi(num, BT_SZ(bt));
 245 }
 246
 247 static void tmp_reg(struct tmp *tmp, int dst, unsigned bt, int deref)
 248 {
 249         if (!(tmp->flags & TMP_ADDR))
 250                 deref = 0;
 251         if (deref)
 252                 tmp->flags &= ~TMP_ADDR;
 253         if (tmp->flags & LOC_NUM) {
 254                 num_cast(tmp, bt);
 255                 tmp->bt = BT_TMPBT(bt);
 256                 num_reg(dst, tmp->bt, tmp->addr);
 257                 tmp->addr = dst;
 258                 regs[dst] = tmp;
 259                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 260         }
 261         if (tmp->flags & LOC_SYM) {
 262                 regop1(MOV_I2X, 0, dst, TMP_BT(tmp));
 263                 if (!nogen)
 264                         out_rela(tmp->addr, codeaddr(), 0);
 265                 oi(0, 4);
 266                 tmp->addr = dst;
 267                 regs[dst] = tmp;
 268                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 269         }
 270         if (tmp->flags & LOC_REG) {
 271                 if (deref)
 272                         mov_m2r(dst, tmp->addr, 0, tmp->bt, bt);
 273                 else
 274                         mov_r2r(tmp->addr, dst, TMP_BT(tmp), bt);
 275                 regs[tmp->addr] = NULL;
 276                 tmp->addr = dst;
 277                 tmp->bt = BT_TMPBT(bt);
 278                 regs[dst] = tmp;
 279                 return;
 280         }
 281         if (tmp->flags & LOC_LOCAL) {
 282                 if (deref)
 283                         mov_m2r(dst, R_RBP, -tmp->addr, tmp->bt, bt);
 284                 else
 285                         memop1(LEA_M2R, dst, R_RBP, -tmp->addr, 8);
 286         }
 287         if (tmp->flags & LOC_MEM) {
 288                 mov_m2r(dst, R_RBP, -tmp->addr,
 289                         deref ? 8 : TMP_BT(tmp), deref ? 8 : bt);
 290                 if (deref)
 291                         mov_m2r(dst, dst, 0, tmp->bt, bt);
 292         }
 293         tmp->addr = dst;
 294         tmp->bt = BT_TMPBT(bt);
 295         regs[dst] = tmp;
 296         tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 297 }
 298
 299 static void reg_free(int reg)
 300 {
 301         int i;
 302         if (!regs[reg])
 303                 return;
 304         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 305                 if (!regs[tmpregs[i]]) {
 306                         tmp_reg(regs[reg], tmpregs[i], regs[reg]->bt, 0);
 307                         return;
 308                 }
 309         tmp_mem(regs[reg]);
 310 }
 311
 312 static void reg_for(int reg, struct tmp *t)
 313 {
 314         if (regs[reg] && regs[reg] != t)
 315                 reg_free(reg);
 316 }
 317
 318 static void tmp_pop_bt(unsigned bt, int reg)
 319 {
 320         struct tmp *t = &tmp[--ntmp];
 321         reg_for(reg, t);
 322         tmp_reg(t, reg, bt, 1);
 323         regs[reg] = NULL;
 324 }
 325
 326 static unsigned tmp_pop(int deref, int reg)
 327 {
 328         struct tmp *t = &tmp[--ntmp];
 329         reg_for(reg, t);
 330         tmp_reg(t, reg, deref ? t->bt : TMP_BT(t), deref);
 331         regs[reg] = NULL;
 332         return t->bt;
 333 }
 334
 335 static void tmp_push_reg(unsigned bt, unsigned reg)
 336 {
 337         struct tmp *t = &tmp[ntmp++];
 338         t->addr = reg;
 339         t->bt = bt;
 340         t->flags = LOC_REG;
 341         regs[reg] = t;
 342 }
 343
 344 void o_local(long addr, unsigned bt)
 345 {
 346         struct tmp *t = &tmp[ntmp++];
 347         t->addr = addr;
 348         t->bt = bt;
 349         t->flags = LOC_LOCAL | TMP_ADDR;
 350 }
 351
 352 void o_num(long num, unsigned bt)
 353 {
 354         struct tmp *t = &tmp[ntmp++];
 355         t->addr = num;
 356         t->bt = bt;
 357         t->flags = LOC_NUM;
 358 }
 359
 360 void o_symaddr(long addr, unsigned bt)
 361 {
 362         struct tmp *t = &tmp[ntmp++];
 363         t->bt = bt;
 364         t->addr = addr;
 365         t->flags = LOC_SYM | TMP_ADDR;
 366 }
 367
 368 void o_tmpdrop(int n)
 369 {
 370         int i;
 371         if (n == -1 || n > ntmp)
 372                 n = ntmp;
 373         ntmp -= n;
 374         for (i = ntmp; i < ntmp + n; i++)
 375                 if (tmp[i].flags & LOC_REG)
 376                         regs[tmp[i].addr] = NULL;
 377         if (!ntmp) {
 378                 if (tmpsp != -1)
 379                         sp = tmpsp;
 380                 tmpsp = -1;
 381         }
 382 }
 383
 384 #define FORK_REG                R_RAX
 385
 386 void o_tmpfork(void)
 387 {
 388         struct tmp *t = &tmp[ntmp - 1];
 389         reg_for(FORK_REG, t);
 390         tmp_reg(t, FORK_REG, t->bt, 0);
 391         o_tmpdrop(1);
 392 }
 393
 394 void o_tmpjoin(void)
 395 {
 396         struct tmp *t = &tmp[ntmp - 1];
 397         reg_for(FORK_REG, t);
 398         tmp_reg(t, FORK_REG, t->bt, 0);
 399 }
 400
 401 void o_tmpswap(void)
 402 {
 403         struct tmp *t1 = &tmp[ntmp - 1];
 404         struct tmp *t2 = &tmp[ntmp - 2];
 405         struct tmp t;
 406         memcpy(&t, t1, sizeof(t));
 407         memcpy(t1, t2, sizeof(t));
 408         memcpy(t2, &t, sizeof(t));
 409 }
 410
 411 static int reg_get(int mask)
 412 {
 413         int i;
 414         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 415                 if ((1 << tmpregs[i]) & mask && !regs[tmpregs[i]])
 416                         return tmpregs[i];
 417         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 418                 if ((1 << tmpregs[i]) & mask) {
 419                         reg_free(tmpregs[i]);
 420                         return tmpregs[i];
 421                 }
 422         return 0;
 423 }
 424
 425 void o_tmpcopy(void)
 426 {
 427         struct tmp *t1 = &tmp[ntmp - 1];
 428         struct tmp *t2 = &tmp[ntmp++];
 429         memcpy(t2, t1, sizeof(*t1));
 430         if (!(t1->flags & (LOC_REG | LOC_MEM)))
 431                 return;
 432         if (t1->flags & LOC_MEM) {
 433                 tmp_reg(t2, reg_get(~0), t2->bt, 0);
 434         } else if (t1->flags & LOC_REG) {
 435                 t2->addr = reg_get(~t1->addr);
 436                 regop1(MOV_R2X, t1->addr, t2->addr, BT_TMPBT(TMP_BT(tmp)));
 437         }
 438         t2->flags = t1->flags;
 439 }
 440
 441 void o_cast(unsigned bt)
 442 {
 443         struct tmp *t = &tmp[ntmp - 1];
 444         int reg;
 445         if (t->bt == bt)
 446                 return;
 447         if (t->flags & LOC_NUM) {
 448                 num_cast(t, bt);
 449                 return;
 450         }
 451         reg = BT_SZ(bt) == 1 ? TMP_BYTEREG(t) : TMP_REG(t);
 452         tmp_pop_bt(bt, reg);
 453         tmp_push_reg(bt, reg);
 454 }
 455
 456 long o_func_beg(char *name, int global)
 457 {
 458         long addr = out_func_beg(name, global);
 459         cur = buf;
 460         os("\x55", 1);                  /* push %rbp */
 461         os("\x48\x89\xe5", 3);          /* mov %rsp, %rbp */
 462         sp = 0;
 463         maxsp = 0;
 464         ntmp = 0;
 465         tmpsp = -1;
 466         nret = 0;
 467         cmp_last = -1;
 468         memset(regs, 0, sizeof(regs));
 469         os("\x48\x81\xec", 3);          /* sub $xxx, %rsp */
 470         spsub_addr = codeaddr();
 471         oi(0, 4);
 472         return addr;
 473 }
 474
 475 void o_deref(unsigned bt)
 476 {
 477         struct tmp *t = &tmp[ntmp - 1];
 478         if (t->flags & TMP_ADDR)
 479                 tmp_reg(t, TMP_REG(t), 8, 1);
 480         t->bt = bt;
 481         t->flags |= TMP_ADDR;
 482 }
 483
 484 void o_load(void)
 485 {
 486         struct tmp *t = &tmp[ntmp - 1];
 487         tmp_reg(t, TMP_REG(t), t->bt, 1);
 488 }
 489
 490 static unsigned bt_op(unsigned bt1, unsigned bt2)
 491 {
 492         unsigned s1 = BT_SZ(bt1);
 493         unsigned s2 = BT_SZ(bt2);
 494         unsigned bt = (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 495         return BT_TMPBT(bt);
 496 }
 497
 498 #define TMP_CONST(t)    ((t)->flags & LOC_NUM && !((t)->flags & TMP_ADDR))
 499
 500 int o_popnum(long *c)
 501 {
 502         struct tmp *t = &tmp[ntmp - 1];
 503         if (!TMP_CONST(t))
 504                 return 1;
 505         *c = t->addr;
 506         o_tmpdrop(1);
 507         return 0;
 508 }
 509
 510 static int c_binop(long (*cop)(long a, long b, unsigned bt), unsigned bt)
 511 {
 512         struct tmp *t1 = &tmp[ntmp - 1];
 513         struct tmp *t2 = &tmp[ntmp - 2];
 514         long ret;
 515         if (!TMP_CONST(t1) || !TMP_CONST(t2))
 516                 return 1;
 517         if (!bt)
 518                 bt = bt_op(t1->bt, t2->bt);
 519         ret = cop(t2->addr, t1->addr, bt);
 520         o_tmpdrop(2);
 521         o_num(ret, bt);
 522         return 0;
 523 }
 524
 525 static int c_op(long (*cop)(long a, unsigned bt), unsigned bt)
 526 {
 527         struct tmp *t1 = &tmp[ntmp - 1];
 528         long ret;
 529         if (!TMP_CONST(t1))
 530                 return 1;
 531         if (!bt)
 532                 bt = t1->bt;
 533         ret = cop(t1->addr, bt);
 534         o_tmpdrop(1);
 535         o_num(ret, bt);
 536         return 0;
 537 }
 538
 539 static void shx(int uop, int sop)
 540 {
 541         struct tmp *t = &tmp[ntmp - 2];
 542         unsigned bt;
 543         unsigned reg = TMP_REG2(t, R_RCX);
 544         tmp_pop(1, R_RCX);
 545         bt = tmp_pop(1, reg);
 546         regop1(SHX_REG, bt & BT_SIGNED ? sop : uop, reg, BT_TMPBT(bt));
 547         tmp_push_reg(bt, reg);
 548 }
 549
 550 static long c_shl(long a, long b, unsigned bt)
 551 {
 552         return a << b;
 553 }
 554
 555 void o_shl(void)
 556 {
 557         if (!c_binop(c_shl, 0))
 558                 return;
 559         shx(4, 4);
 560 }
 561
 562 static long c_shr(long a, long b, unsigned bt)
 563 {
 564         if (bt & BT_SIGNED)
 565                 return a >> b;
 566         else
 567                 return (unsigned long) a >> b;
 568 }
 569
 570 void o_shr(void)
 571 {
 572         if (!c_binop(c_shr, 0))
 573                 return;
 574         shx(5, 7);
 575 }
 576
 577 static int mulop(int uop, int sop, int reg)
 578 {
 579         struct tmp *t1 = &tmp[ntmp - 1];
 580         struct tmp *t2 = &tmp[ntmp - 2];
 581         int bt1 = TMP_BT(t1);
 582         int bt2 = TMP_BT(t2);
 583         int bt = bt_op(bt1, bt2);
 584         if (t1->flags & LOC_REG && t1->addr != R_RAX && t1->addr != R_RDX)
 585                 reg = t1->addr;
 586         reg_for(reg, t1);
 587         tmp_reg(t1, reg, bt, 1);
 588         reg_for(R_RAX, t2);
 589         tmp_reg(t2, R_RAX, bt, 1);
 590         if (reg != R_RDX)
 591                 reg_free(R_RDX);
 592         o_tmpdrop(2);
 593         regop1(MUL_A2X, bt & BT_SIGNED ? sop : uop, reg, BT_TMPBT(bt2));
 594         return bt;
 595 }
 596
 597 static long c_mul(long a, long b, unsigned bt)
 598 {
 599         return a * b;
 600 }
 601
 602 void o_mul(void)
 603 {
 604         int bt;
 605         if (!c_binop(c_mul, 0))
 606                 return;
 607         bt = mulop(4, 5, R_RDX);
 608         tmp_push_reg(bt, R_RAX);
 609 }
 610
 611 static long c_div(long a, long b, unsigned bt)
 612 {
 613         return a / b;
 614 }
 615
 616 void o_div(void)
 617 {
 618         int bt;
 619         if (!c_binop(c_div, 0))
 620                 return;
 621         bt = mulop(6, 7, R_RCX);
 622         tmp_push_reg(bt, R_RAX);
 623 }
 624
 625 static long c_mod(long a, long b, unsigned bt)
 626 {
 627         return a % b;
 628 }
 629
 630 void o_mod(void)
 631 {
 632         int bt;
 633         if (!c_binop(c_mod, 0))
 634                 return;
 635         bt = mulop(6, 7, R_RCX);
 636         tmp_push_reg(bt, R_RDX);
 637 }
 638
 639 void o_addr(void)
 640 {
 641         tmp[ntmp - 1].flags &= ~TMP_ADDR;
 642         tmp[ntmp - 1].bt = 8;
 643 }
 644
 645 void o_ret(unsigned bt)
 646 {
 647         if (bt)
 648                 tmp_pop_bt(bt, R_RAX);
 649         else
 650                 os("\x31\xc0", 2);      /* xor %eax, %eax */
 651         ret[nret++] = o_jmp(0);
 652 }
 653
 654 static int binop(int op, int *reg)
 655 {
 656         struct tmp *t1 = &tmp[ntmp - 1];
 657         struct tmp *t2 = &tmp[ntmp - 2];
 658         int r1;
 659         unsigned bt;
 660         r1 = TMP_REG(t1);
 661         *reg = TMP_REG2(t2, r1);
 662         bt = bt_op(t1->bt, t2->bt);
 663         tmp_pop_bt(bt, r1);
 664         tmp_pop_bt(bt, *reg);
 665         regop1(op, *reg, r1, bt);
 666         return bt;
 667 }
 668
 669 static long c_add(long a, long b, unsigned bt)
 670 {
 671         return a + b;
 672 }
 673
 674 void o_add(void)
 675 {
 676         int reg;
 677         int bt;
 678         if (!c_binop(c_add, 0))
 679                 return;
 680         bt = binop(ADD_R2X, &reg);
 681         tmp_push_reg(bt, reg);
 682 }
 683
 684 static long c_xor(long a, long b, unsigned bt)
 685 {
 686         return a ^ b;
 687 }
 688
 689 void o_xor(void)
 690 {
 691         int reg;
 692         int bt;
 693         if (!c_binop(c_xor, 0))
 694                 return;
 695         bt = binop(XOR_R2X, &reg);
 696         tmp_push_reg(bt, reg);
 697 }
 698
 699 static long c_and(long a, long b, unsigned bt)
 700 {
 701         return a & b;
 702 }
 703
 704 void o_and(void)
 705 {
 706         int reg;
 707         int bt;
 708         if (!c_binop(c_and, 0))
 709                 return;
 710         bt = binop(AND_R2X, &reg);
 711         tmp_push_reg(bt, reg);
 712 }
 713
 714 static long c_or(long a, long b, unsigned bt)
 715 {
 716         return a | b;
 717 }
 718
 719 void o_or(void)
 720 {
 721         int reg;
 722         int bt;
 723         if (!c_binop(c_or, 0))
 724                 return;
 725         bt = binop(OR_R2X, &reg);
 726         tmp_push_reg(bt, reg);
 727 }
 728
 729 static long c_sub(long a, long b, unsigned bt)
 730 {
 731         return a - b;
 732 }
 733
 734 void o_sub(void)
 735 {
 736         int reg;
 737         int bt;
 738         if (!c_binop(c_sub, 0))
 739                 return;
 740         bt = binop(SUB_R2X, &reg);
 741         tmp_push_reg(bt, reg);
 742 }
 743
 744 static void o_cmp(int uop, int sop)
 745 {
 746         char set[] = "\x0f\x00\xc0";
 747         int reg;
 748         int bt = binop(CMP_R2X, &reg);
 749         set[1] = bt & BT_SIGNED ? sop : uop;
 750         reg_free(R_RAX);
 751         cmp_setl = codeaddr();
 752         os(set, 3);                     /* setl %al */
 753         os("\x0f\xb6\xc0", 3);          /* movzbl %al, %eax */
 754         tmp_push_reg(4 | BT_SIGNED, R_RAX);
 755         cmp_last = codeaddr();
 756 }
 757
 758 static long c_lt(long a, long b, unsigned bt)
 759 {
 760         return a < b;
 761 }
 762
 763 void o_lt(void)
 764 {
 765         if (!c_binop(c_lt, 4))
 766                 return;
 767         o_cmp(0x92, 0x9c);
 768 }
 769
 770 static long c_gt(long a, long b, unsigned bt)
 771 {
 772         return a > b;
 773 }
 774
 775 void o_gt(void)
 776 {
 777         if (!c_binop(c_gt, 4))
 778                 return;
 779         o_cmp(0x97, 0x9f);
 780 }
 781
 782 static long c_le(long a, long b, unsigned bt)
 783 {
 784         return a <= b;
 785 }
 786
 787 void o_le(void)
 788 {
 789         if (!c_binop(c_le, 4))
 790                 return;
 791         o_cmp(0x96, 0x9e);
 792 }
 793
 794 static long c_ge(long a, long b, unsigned bt)
 795 {
 796         return a >= b;
 797 }
 798
 799 void o_ge(void)
 800 {
 801         if (!c_binop(c_ge, 4))
 802                 return;
 803         o_cmp(0x93, 0x9d);
 804 }
 805
 806 static long c_eq(long a, long b, unsigned bt)
 807 {
 808         return a == b;
 809 }
 810
 811 void o_eq(void)
 812 {
 813         if (!c_binop(c_eq, 4))
 814                 return;
 815         o_cmp(0x94, 0x94);
 816 }
 817
 818 static long c_neq(long a, long b, unsigned bt)
 819 {
 820         return a != b;
 821 }
 822
 823 void o_neq(void)
 824 {
 825         if (!c_binop(c_neq, 4))
 826                 return;
 827         o_cmp(0x95, 0x95);
 828 }
 829
 830 static long c_lnot(long a, unsigned bt)
 831 {
 832         return !a;
 833 }
 834
 835 void o_lnot(void)
 836 {
 837         if (!c_op(c_lnot, 4))
 838                 return;
 839         if (cmp_last == codeaddr()) {
 840                 buf[cmp_setl + 1] ^= 0x10;
 841         } else {
 842                 o_num(0, 4 | BT_SIGNED);
 843                 o_eq();
 844         }
 845 }
 846
 847 static long c_neg(long a, unsigned bt)
 848 {
 849         return -a;
 850 }
 851
 852 void o_neg(void)
 853 {
 854         struct tmp *t = &tmp[ntmp - 1];
 855         int reg;
 856         unsigned bt = BT_TMPBT(t->bt);
 857         if (!c_op(c_neg, t->bt | BT_SIGNED))
 858                 return;
 859         reg = TMP_REG(t);
 860         tmp_pop_bt(bt, reg);
 861         regop1(NEG_REG, 3, reg, bt);
 862         tmp_push_reg(bt, reg);
 863 }
 864
 865 static long c_not(long a, unsigned bt)
 866 {
 867         return ~a;
 868 }
 869
 870 void o_not(void)
 871 {
 872         struct tmp *t = &tmp[ntmp - 1];
 873         int reg;
 874         unsigned bt = BT_TMPBT(t->bt);
 875         if (!c_op(c_not, 0))
 876                 return;
 877         reg = TMP_REG(t);
 878         tmp_pop_bt(bt, reg);
 879         regop1(NOT_REG, 2, reg, bt);
 880         tmp_push_reg(t->bt, reg);
 881 }
 882
 883 void o_func_end(void)
 884 {
 885         int i;
 886         for (i = 0; i < nret; i++)
 887                 o_filljmp(ret[i]);
 888         os("\xc9\xc3", 2);              /* leave; ret; */
 889         putint(buf + spsub_addr, (maxsp + 7) & ~0x07, 4);
 890         out_func_end(buf, cur - buf);
 891 }
 892
 893 long o_mklocal(int size)
 894 {
 895         return sp_push((size + 7) & ~0x07);
 896 }
 897
 898 void o_rmlocal(long addr, int sz)
 899 {
 900         sp = addr - sz;
 901 }
 902
 903 static int arg_regs[] = {R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
 904
 905 long o_arg(int i, unsigned bt)
 906 {
 907         long addr = o_mklocal(BT_SZ(bt));
 908         memop1(MOV_R2X, arg_regs[i], R_RBP, -addr, bt);
 909         return addr;
 910 }
 911
 912 void o_assign(unsigned bt)
 913 {
 914         struct tmp *t1 = &tmp[ntmp - 1];
 915         struct tmp *t2 = &tmp[ntmp - 2];
 916         int r1 = BT_SZ(bt) > 1 ? TMP_REG(t1) : TMP_BYTEREG(t1);
 917         int reg;
 918         int off;
 919         tmp_pop_bt(BT_TMPBT(bt), r1);
 920         if (t2->flags & LOC_LOCAL) {
 921                 reg = R_RBP;
 922                 off = -t2->addr;
 923                 o_tmpdrop(1);
 924         } else {
 925                 reg = TMP_REG2(t2, r1);
 926                 off = 0;
 927                 tmp_pop(0, reg);
 928         }
 929         memop1(MOV_R2X, r1, reg, off, bt);
 930         tmp_push_reg(bt, r1);
 931 }
 932
 933 long o_mklabel(void)
 934 {
 935         return codeaddr();
 936 }
 937
 938 static long jx(int x, long addr)
 939 {
 940         char op[2] = {0x0f};
 941         op[1] = x;
 942         os(op, 2);              /* jx $addr */
 943         oi(addr - codeaddr() - 4, 4);
 944         return codeaddr() - 4;
 945 }
 946
 947 static long jxtest(int x, long addr)
 948 {
 949         int bt = tmp_pop(1, R_RAX);
 950         regop1(TEST_R2R, R_RAX, R_RAX, bt);
 951         return jx(x, addr);
 952 }
 953
 954 static long jxcmp(long addr, int inv)
 955 {
 956         int x;
 957         if (codeaddr() != cmp_last)
 958                 return -1;
 959         o_tmpdrop(1);
 960         cur = buf + cmp_setl;
 961         x = (unsigned char) buf[cmp_setl + 1];
 962         return jx((inv ? x : x ^ 0x01) & ~0x10, addr);
 963 }
 964
 965 long o_jz(long addr)
 966 {
 967         long ret = jxcmp(addr, 0);
 968         return ret != -1 ? ret : jxtest(0x84, addr);
 969 }
 970
 971 long o_jnz(long addr)
 972 {
 973         long ret = jxcmp(addr, 1);
 974         return ret != -1 ? ret : jxtest(0x85, addr);
 975 }
 976
 977 long o_jmp(long addr)
 978 {
 979         os("\xe9", 1);                  /* jmp $addr */
 980         oi(addr - codeaddr() - 4, 4);
 981         return codeaddr() - 4;
 982 }
 983
 984 void o_filljmp2(long addr, long jmpdst)
 985 {
 986         putint(buf + addr, jmpdst - addr - 4, 4);
 987 }
 988
 989 void o_filljmp(long addr)
 990 {
 991         o_filljmp2(addr, codeaddr());
 992 }
 993
 994 void o_call(int argc, unsigned *bt, unsigned ret_bt)
 995 {
 996         int i;
 997         struct tmp *t;
 998         for (i = 0; i < argc; i++)
 999                 tmp_pop_bt(bt[argc - i - 1], arg_regs[argc - i - 1]);
1000         t = &tmp[ntmp - 1];
1001         if (t->flags & LOC_SYM) {
1002                 os("\x31\xc0", 2);      /* xor %eax, %eax */
1003                 os("\xe8", 1);          /* call $x */
1004                 if (!nogen)
1005                         out_rela(t->addr, codeaddr(), 1);
1006                 oi(-4, 4);
1007                 o_tmpdrop(1);
1008         } else {
1009                 tmp_pop(0, R_RAX);
1010                 regop1(CALL_REG, 2, R_RAX, 4);
1011         }
1012         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
1013                 if (regs[i])
1014                         tmp_mem(regs[i]);
1015         if (ret_bt)
1016                 tmp_push_reg(ret_bt, R_RAX);
1017 }
1018
1019 int o_nogen(void)
1020 {
1021         return nogen++;
1022 }
1023
1024 void o_dogen(void)
1025 {
1026         nogen = 0;
1027 }