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 MIN(a, b)               ((a) < (b) ? (a) : (b))
  51
  52 #define R_BYTEMASK              (1 << R_RAX | 1 << R_RDX | 1 << R_RCX)
  53 #define TMP_BT(t)               ((t)->flags & TMP_ADDR ? 8 : (t)->bt)
  54 #define TMP_REG(t)              ((t)->flags & LOC_REG ? (t)->addr : reg_get(~0))
  55 #define TMP_REG2(t, r)          ((t)->flags & LOC_REG && (t)->addr != r ? \
  56                                         (t)->addr : reg_get(~(1 << r)))
  57 #define TMP_BYTEREG(t)          ((t)->flags & LOC_REG && \
  58                                  (1 << (t)->addr) & R_BYTEMASK ? \
  59                                         (t)->addr : reg_get(R_BYTEMASK))
  60 #define BT_TMPBT(bt)            (BT_SZ(bt) >= 4 ? (bt) : (bt) & BT_SIGNED | 4)
  61
  62 static char buf[SECSIZE];
  63 static char *cur;
  64 static int nogen;
  65 static long sp;
  66 static long spsub_addr;
  67 static long maxsp;
  68
  69 static struct tmp {
  70         long addr;
  71         long off;       /* used for LOC_SYM; offset from a symbol address */
  72         unsigned flags;
  73         unsigned bt;
  74 } tmp[MAXTMP];
  75 static int ntmp;
  76
  77 static int tmpsp;
  78
  79 static struct tmp *regs[NREGS];
  80 static int tmpregs[] = {R_RAX, R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
  81
  82 #define MAXRET                  (1 << 8)
  83
  84 static long ret[MAXRET];
  85 static int nret;
  86
  87 static long cmp_last;
  88 static long cmp_setl;
  89
  90 static void putint(char *s, long n, int l)
  91 {
  92         if (nogen)
  93                 return;
  94         while (l--) {
  95                 *s++ = n;
  96                 n >>= 8;
  97         }
  98 }
  99
 100 static void os(char *s, int n)
 101 {
 102         if (nogen)
 103                 return;
 104         while (n--)
 105                 *cur++ = *s++;
 106 }
 107
 108 static void oi(long n, int l)
 109 {
 110         while (l--) {
 111                 *cur++ = n;
 112                 n >>= 8;
 113         }
 114 }
 115
 116 static long codeaddr(void)
 117 {
 118         return cur - buf;
 119 }
 120
 121 static void o_op(int *op, int nop, int r1, int r2, unsigned bt)
 122 {
 123         int rex = 0;
 124         int i;
 125         if (r1 & 0x8)
 126                 rex |= 4;
 127         if (r2 & 0x8)
 128                 rex |= 1;
 129         if (BT_SZ(bt) == 8)
 130                 rex |= 8;
 131         if (rex || (bt & BT_SZMASK) == 8)
 132                 oi(0x40 | rex, 1);
 133         if ((bt & BT_SZMASK) == 2)
 134                 oi(0x66, 1);
 135         if ((bt & BT_SZMASK) == 1)
 136                 op[nop - 1] &= ~0x1;
 137         for (i = 0; i < nop; i++)
 138                 oi(op[i], 1);
 139 }
 140
 141 static void memop(int *op, int nop, int src, int base, int off, unsigned bt)
 142 {
 143         int dis = off == (char) off ? 1 : 4;
 144         int mod = dis == 4 ? 2 : 1;
 145         o_op(op, nop, src, base, bt);
 146         if (!off)
 147                 mod = 0;
 148         oi((mod << 6) | ((src & 0x07) << 3) | (base & 0x07), 1);
 149         if (off)
 150                 oi(off, dis);
 151 }
 152
 153 static void memop1(int op, int src, int base, int off, unsigned bt)
 154 {
 155         memop(&op, 1, src, base, off, bt);
 156 }
 157
 158 static void regop(int *op, int nop, int src, int dst, unsigned bt)
 159 {
 160         o_op(op, nop, src, dst, bt);
 161         oi((3 << 6) | (src << 3) | (dst & 0x07), 1);
 162 }
 163
 164 static void regop1(int op, int src, int dst, unsigned bt)
 165 {
 166         regop(&op, 1, src, dst, bt);
 167 }
 168
 169 static long sp_push(int size)
 170 {
 171         sp += size;
 172         if (sp > maxsp)
 173                 maxsp = sp;
 174         return sp;
 175 }
 176
 177 #define LOC_NEW(f, l)           (((f) & ~LOC_MASK) | (l))
 178
 179 static void tmp_mem(struct tmp *tmp)
 180 {
 181         int src = tmp->addr;
 182         if (!(tmp->flags & LOC_REG))
 183                 return;
 184         if (tmpsp == -1)
 185                 tmpsp = sp;
 186         tmp->addr = -sp_push(8);
 187         memop1(MOV_R2X, src, R_RBP, tmp->addr, BT_TMPBT(TMP_BT(tmp)));
 188         regs[src] = NULL;
 189         tmp->flags = LOC_NEW(tmp->flags, LOC_MEM);
 190 }
 191
 192 static int *movxx_x2r(int bt)
 193 {
 194         static int movxx[2] = {0x0f};
 195         if (BT_SZ(bt) == 1)
 196                 movxx[1] = bt & BT_SIGNED ? 0xbe : 0xb6;
 197         else
 198                 movxx[1] = bt & BT_SIGNED ? 0xbf : 0xb7;
 199         return movxx;
 200 }
 201
 202 #define MOVSXD          0x63
 203
 204 static void mov_r2r(int r1, int r2, unsigned bt1, unsigned bt2)
 205 {
 206         int s1 = bt1 & BT_SIGNED;
 207         int s2 = bt2 & BT_SIGNED;
 208         int sz1 = BT_SZ(bt1);
 209         int sz2 = BT_SZ(bt2);
 210         if (sz2 < 4 && (sz1 >= sz2 && s1 != s2)) {
 211                 regop(movxx_x2r(bt2), 2, r1, r2, 4);
 212                 return;
 213         }
 214         if (sz1 == 4 && sz2 == 8) {
 215                 regop1(MOVSXD, r2, r1, sz2);
 216                 return;
 217         }
 218         if (r1 != r2 || sz1 > sz2)
 219                 regop1(MOV_R2X, r1, r2, BT_TMPBT(bt2));
 220 }
 221
 222 static void mov_m2r(int dst, int base, int off, int bt1, int bt2)
 223 {
 224         if (BT_SZ(bt1) < 4) {
 225                 memop(movxx_x2r(bt1), 2, dst, base, off,
 226                         bt1 & BT_SIGNED && BT_SZ(bt2) == 8 ? 8 : 4);
 227                 mov_r2r(dst, dst, bt1, bt2);
 228         } else {
 229                 memop1(MOV_M2R, dst, base, off, bt1);
 230                 mov_r2r(dst, dst, bt1, bt2);
 231         }
 232 }
 233
 234 static void num_cast(struct tmp *t, unsigned bt)
 235 {
 236         if (!(bt & BT_SIGNED) && BT_SZ(bt) != 8)
 237                 t->addr &= ((1l << (long) (BT_SZ(bt) * 8)) - 1);
 238         if (bt & BT_SIGNED && BT_SZ(bt) != 8 &&
 239                                 t->addr > (1l << (BT_SZ(bt) * 8 - 1)))
 240                 t->addr = -((1l << (BT_SZ(bt) * 8)) - t->addr);
 241         t->bt = bt;
 242 }
 243
 244 static void num_reg(int reg, unsigned bt, long num)
 245 {
 246         int op = MOV_I2R + (reg & 7);
 247         if (BT_SZ(bt) == 8 && num >= 0 && num == (unsigned) num)
 248                 bt = 4;
 249         o_op(&op, 1, 0, reg, bt);
 250         oi(num, BT_SZ(bt));
 251 }
 252
 253 static void tmp_reg(struct tmp *tmp, int dst, unsigned bt, int deref)
 254 {
 255         if (deref && tmp->flags & TMP_ADDR)
 256                 tmp->flags &= ~TMP_ADDR;
 257         else
 258                 deref = 0;
 259         if (tmp->flags & LOC_NUM) {
 260                 num_cast(tmp, bt);
 261                 tmp->bt = BT_TMPBT(bt);
 262                 num_reg(dst, tmp->bt, tmp->addr);
 263                 tmp->addr = dst;
 264                 regs[dst] = tmp;
 265                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 266         }
 267         if (tmp->flags & LOC_SYM) {
 268                 regop1(MOV_I2X, 0, dst, TMP_BT(tmp));
 269                 if (!nogen)
 270                         out_rela(tmp->addr, codeaddr(), 0);
 271                 oi(tmp->off, 4);
 272                 tmp->addr = dst;
 273                 regs[dst] = tmp;
 274                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 275         }
 276         if (tmp->flags & LOC_REG) {
 277                 if (deref)
 278                         mov_m2r(dst, tmp->addr, 0, tmp->bt, bt);
 279                 else
 280                         mov_r2r(tmp->addr, dst, TMP_BT(tmp),
 281                                 tmp->flags & TMP_ADDR ? 8 : bt);
 282                 regs[tmp->addr] = NULL;
 283         }
 284         if (tmp->flags & LOC_LOCAL) {
 285                 if (deref)
 286                         mov_m2r(dst, R_RBP, tmp->addr, tmp->bt, bt);
 287                 else
 288                         memop1(LEA_M2R, dst, R_RBP, tmp->addr, 8);
 289         }
 290         if (tmp->flags & LOC_MEM) {
 291                 mov_m2r(dst, R_RBP, tmp->addr,
 292                         deref ? 8 : TMP_BT(tmp), deref ? 8 : bt);
 293                 if (deref)
 294                         mov_m2r(dst, dst, 0, tmp->bt, bt);
 295         }
 296         tmp->addr = dst;
 297         tmp->bt = tmp->flags & TMP_ADDR ? bt : BT_TMPBT(bt);
 298         regs[dst] = tmp;
 299         tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 300 }
 301
 302 static void reg_free(int reg)
 303 {
 304         int i;
 305         if (!regs[reg])
 306                 return;
 307         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 308                 if (!regs[tmpregs[i]]) {
 309                         tmp_reg(regs[reg], tmpregs[i], regs[reg]->bt, 0);
 310                         return;
 311                 }
 312         tmp_mem(regs[reg]);
 313 }
 314
 315 static void reg_for(int reg, struct tmp *t)
 316 {
 317         if (regs[reg] && regs[reg] != t)
 318                 reg_free(reg);
 319 }
 320
 321 static void tmp_pop_bt(unsigned bt, int reg)
 322 {
 323         struct tmp *t = &tmp[--ntmp];
 324         reg_for(reg, t);
 325         tmp_reg(t, reg, bt, 1);
 326         regs[reg] = NULL;
 327 }
 328
 329 static unsigned tmp_pop(int deref, int reg)
 330 {
 331         struct tmp *t = &tmp[--ntmp];
 332         reg_for(reg, t);
 333         tmp_reg(t, reg, deref ? t->bt : TMP_BT(t), deref);
 334         regs[reg] = NULL;
 335         return t->bt;
 336 }
 337
 338 static struct tmp *tmp_new(void)
 339 {
 340         cmp_last = -1;
 341         return &tmp[ntmp++];
 342 }
 343
 344 static void tmp_push_reg(unsigned bt, unsigned reg)
 345 {
 346         struct tmp *t = tmp_new();
 347         t->addr = reg;
 348         t->bt = bt;
 349         t->flags = LOC_REG;
 350         regs[reg] = t;
 351 }
 352
 353 void o_local(long addr, unsigned bt)
 354 {
 355         struct tmp *t = tmp_new();
 356         t->addr = -addr;
 357         t->bt = bt;
 358         t->flags = LOC_LOCAL | TMP_ADDR;
 359 }
 360
 361 void o_num(long num, unsigned bt)
 362 {
 363         struct tmp *t = tmp_new();
 364         t->addr = num;
 365         t->bt = bt;
 366         t->flags = LOC_NUM;
 367 }
 368
 369 void o_symaddr(long addr, unsigned bt)
 370 {
 371         struct tmp *t = tmp_new();
 372         t->bt = bt;
 373         t->addr = addr;
 374         t->flags = LOC_SYM | TMP_ADDR;
 375         t->off = 0;
 376 }
 377
 378 void o_tmpdrop(int n)
 379 {
 380         int i;
 381         cmp_last = -1;
 382         if (n == -1 || n > ntmp)
 383                 n = ntmp;
 384         ntmp -= n;
 385         for (i = ntmp; i < ntmp + n; i++)
 386                 if (tmp[i].flags & LOC_REG)
 387                         regs[tmp[i].addr] = NULL;
 388         if (!ntmp) {
 389                 if (tmpsp != -1)
 390                         sp = tmpsp;
 391                 tmpsp = -1;
 392         }
 393 }
 394
 395 #define FORK_REG                R_RAX
 396
 397 void o_tmpfork(void)
 398 {
 399         struct tmp *t = &tmp[ntmp - 1];
 400         reg_for(FORK_REG, t);
 401         tmp_reg(t, FORK_REG, t->bt, 1);
 402         o_tmpdrop(1);
 403 }
 404
 405 void o_tmpjoin(void)
 406 {
 407         struct tmp *t = &tmp[ntmp - 1];
 408         reg_for(FORK_REG, t);
 409         tmp_reg(t, FORK_REG, t->bt, 1);
 410 }
 411
 412 void o_tmpswap(void)
 413 {
 414         struct tmp *t1 = &tmp[ntmp - 1];
 415         struct tmp *t2 = &tmp[ntmp - 2];
 416         struct tmp t;
 417         memcpy(&t, t1, sizeof(t));
 418         memcpy(t1, t2, sizeof(t));
 419         memcpy(t2, &t, sizeof(t));
 420 }
 421
 422 static int reg_get(int mask)
 423 {
 424         int i;
 425         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 426                 if ((1 << tmpregs[i]) & mask && !regs[tmpregs[i]])
 427                         return tmpregs[i];
 428         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 429                 if ((1 << tmpregs[i]) & mask) {
 430                         reg_free(tmpregs[i]);
 431                         return tmpregs[i];
 432                 }
 433         return 0;
 434 }
 435
 436 void o_tmpcopy(void)
 437 {
 438         struct tmp *t1 = &tmp[ntmp - 1];
 439         struct tmp *t2 = tmp_new();
 440         memcpy(t2, t1, sizeof(*t1));
 441         if (!(t1->flags & (LOC_REG | LOC_MEM)))
 442                 return;
 443         if (t1->flags & LOC_MEM) {
 444                 tmp_reg(t2, reg_get(~0), t2->bt, 0);
 445         } else if (t1->flags & LOC_REG) {
 446                 t2->addr = reg_get(~t1->addr);
 447                 regop1(MOV_R2X, t1->addr, t2->addr, BT_TMPBT(TMP_BT(t1)));
 448         }
 449         t2->flags = t1->flags;
 450 }
 451
 452 void o_cast(unsigned bt)
 453 {
 454         struct tmp *t = &tmp[ntmp - 1];
 455         int reg;
 456         if (t->bt == bt)
 457                 return;
 458         if (t->flags & LOC_NUM) {
 459                 num_cast(t, bt);
 460                 return;
 461         }
 462         reg = BT_SZ(bt) == 1 ? TMP_BYTEREG(t) : TMP_REG(t);
 463         tmp_pop_bt(bt, reg);
 464         tmp_push_reg(bt, reg);
 465 }
 466
 467 long o_func_beg(char *name, int global)
 468 {
 469         long addr = out_func_beg(name, global);
 470         cur = buf;
 471         os("\x55", 1);                  /* push %rbp */
 472         os("\x48\x89\xe5", 3);          /* mov %rsp, %rbp */
 473         sp = 0;
 474         maxsp = 0;
 475         ntmp = 0;
 476         tmpsp = -1;
 477         nret = 0;
 478         cmp_last = -1;
 479         memset(regs, 0, sizeof(regs));
 480         os("\x48\x81\xec", 3);          /* sub $xxx, %rsp */
 481         spsub_addr = codeaddr();
 482         oi(0, 4);
 483         return addr;
 484 }
 485
 486 void o_deref(unsigned bt)
 487 {
 488         struct tmp *t = &tmp[ntmp - 1];
 489         if (t->flags & TMP_ADDR)
 490                 tmp_reg(t, TMP_REG(t), 8, 1);
 491         t->bt = bt;
 492         t->flags |= TMP_ADDR;
 493 }
 494
 495 void o_load(void)
 496 {
 497         struct tmp *t = &tmp[ntmp - 1];
 498         tmp_reg(t, TMP_REG(t), t->bt, 1);
 499 }
 500
 501 static unsigned bt_op(unsigned bt1, unsigned bt2)
 502 {
 503         unsigned s1 = BT_SZ(bt1);
 504         unsigned s2 = BT_SZ(bt2);
 505         unsigned bt = (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 506         return BT_TMPBT(bt);
 507 }
 508
 509 #define TMP_CONST(t)    ((t)->flags & LOC_NUM && !((t)->flags & TMP_ADDR))
 510 #define LOCAL_PTR(t)    ((t)->flags & LOC_LOCAL && !((t)->flags & TMP_ADDR))
 511 #define SYM_PTR(t)      ((t)->flags & LOC_LOCAL && !((t)->flags & TMP_ADDR))
 512
 513 int o_popnum(long *c)
 514 {
 515         struct tmp *t = &tmp[ntmp - 1];
 516         if (!TMP_CONST(t))
 517                 return 1;
 518         *c = t->addr;
 519         o_tmpdrop(1);
 520         return 0;
 521 }
 522
 523 static int c_binop(long (*cop)(long a, long b, unsigned bt), unsigned bt)
 524 {
 525         struct tmp *t1 = &tmp[ntmp - 1];
 526         struct tmp *t2 = &tmp[ntmp - 2];
 527         int locals = LOCAL_PTR(t1) + LOCAL_PTR(t2);
 528         int syms = SYM_PTR(t1) + SYM_PTR(t2);
 529         int nums = TMP_CONST(t1) + TMP_CONST(t2);
 530         if (syms == 2 || syms && locals || syms + nums + locals != 2)
 531                 return 1;
 532         if (!bt) {
 533                 if (!locals)
 534                         bt = syms ? 8 : bt_op(t1->bt, t2->bt);
 535                 if (locals == 1)
 536                         bt = 8;
 537                 if (locals == 2)
 538                         bt = 4 | BT_SIGNED;
 539         }
 540         if (syms) {
 541                 long o1 = SYM_PTR(t1) ? t1->off : t1->addr;
 542                 long o2 = SYM_PTR(t2) ? t2->off : t2->addr;
 543                 long ret = cop(o2, o1, bt);
 544                 if (!SYM_PTR(t2))
 545                         o_tmpswap();
 546                 t2->off = ret;
 547                 o_tmpdrop(1);
 548         } else {
 549                 long ret = cop(t2->addr, t1->addr, locals ? 4 | BT_SIGNED : bt);
 550                 o_tmpdrop(2);
 551                 if (locals == 1) {
 552                         o_local(-ret, bt);
 553                         o_addr();
 554                 } else {
 555                         o_num(ret, bt);
 556                 }
 557         }
 558         return 0;
 559 }
 560
 561 static int c_op(long (*cop)(long a, unsigned bt), unsigned bt)
 562 {
 563         struct tmp *t1 = &tmp[ntmp - 1];
 564         long ret;
 565         if (!TMP_CONST(t1))
 566                 return 1;
 567         if (!bt)
 568                 bt = t1->bt;
 569         ret = cop(t1->addr, bt);
 570         o_tmpdrop(1);
 571         o_num(ret, bt);
 572         return 0;
 573 }
 574
 575 static void shx(int uop, int sop)
 576 {
 577         struct tmp *t = &tmp[ntmp - 2];
 578         unsigned bt;
 579         unsigned reg = TMP_REG2(t, R_RCX);
 580         tmp_pop(1, R_RCX);
 581         bt = tmp_pop(1, reg);
 582         regop1(SHX_REG, bt & BT_SIGNED ? sop : uop, reg, BT_TMPBT(bt));
 583         tmp_push_reg(bt, reg);
 584 }
 585
 586 static long c_shl(long a, long b, unsigned bt)
 587 {
 588         return a << b;
 589 }
 590
 591 void o_shl(void)
 592 {
 593         if (!c_binop(c_shl, 0))
 594                 return;
 595         shx(4, 4);
 596 }
 597
 598 static long c_shr(long a, long b, unsigned bt)
 599 {
 600         if (bt & BT_SIGNED)
 601                 return a >> b;
 602         else
 603                 return (unsigned long) a >> b;
 604 }
 605
 606 void o_shr(void)
 607 {
 608         if (!c_binop(c_shr, 0))
 609                 return;
 610         shx(5, 7);
 611 }
 612
 613 static int mulop(int uop, int sop, int reg)
 614 {
 615         struct tmp *t1 = &tmp[ntmp - 1];
 616         struct tmp *t2 = &tmp[ntmp - 2];
 617         int bt1 = TMP_BT(t1);
 618         int bt2 = TMP_BT(t2);
 619         int bt = bt_op(bt1, bt2);
 620         if (t1->flags & LOC_REG && t1->addr != R_RAX && t1->addr != R_RDX)
 621                 reg = t1->addr;
 622         reg_for(reg, t1);
 623         tmp_reg(t1, reg, bt, 1);
 624         reg_for(R_RAX, t2);
 625         tmp_reg(t2, R_RAX, bt, 1);
 626         if (reg != R_RDX) {
 627                 int cqo = 0x99;
 628                 reg_free(R_RDX);
 629                 if (bt & BT_SIGNED)
 630                         o_op(&cqo, 1, R_RAX, R_RDX, bt);
 631                 else
 632                         regop1(XOR_R2X, R_RDX, R_RDX, bt);
 633         }
 634         o_tmpdrop(2);
 635         regop1(MUL_A2X, bt & BT_SIGNED ? sop : uop, reg, BT_TMPBT(bt2));
 636         return bt;
 637 }
 638
 639 static long c_mul(long a, long b, unsigned bt)
 640 {
 641         return a * b;
 642 }
 643
 644 void o_mul(void)
 645 {
 646         int bt;
 647         if (!c_binop(c_mul, 0))
 648                 return;
 649         bt = mulop(4, 5, R_RDX);
 650         tmp_push_reg(bt, R_RAX);
 651 }
 652
 653 static long c_div(long a, long b, unsigned bt)
 654 {
 655         return a / b;
 656 }
 657
 658 void o_div(void)
 659 {
 660         int bt;
 661         if (!c_binop(c_div, 0))
 662                 return;
 663         bt = mulop(6, 7, R_RCX);
 664         tmp_push_reg(bt, R_RAX);
 665 }
 666
 667 static long c_mod(long a, long b, unsigned bt)
 668 {
 669         return a % b;
 670 }
 671
 672 void o_mod(void)
 673 {
 674         int bt;
 675         if (!c_binop(c_mod, 0))
 676                 return;
 677         bt = mulop(6, 7, R_RCX);
 678         tmp_push_reg(bt, R_RDX);
 679 }
 680
 681 void o_addr(void)
 682 {
 683         tmp[ntmp - 1].flags &= ~TMP_ADDR;
 684         tmp[ntmp - 1].bt = 8;
 685 }
 686
 687 void o_ret(unsigned bt)
 688 {
 689         if (bt)
 690                 tmp_pop_bt(bt, R_RAX);
 691         else
 692                 os("\x31\xc0", 2);      /* xor %eax, %eax */
 693         ret[nret++] = o_jmp(0);
 694 }
 695
 696 static int binop(int op, int *reg)
 697 {
 698         struct tmp *t1 = &tmp[ntmp - 1];
 699         struct tmp *t2 = &tmp[ntmp - 2];
 700         int r1;
 701         unsigned bt;
 702         r1 = TMP_REG(t1);
 703         *reg = TMP_REG2(t2, r1);
 704         bt = bt_op(t1->bt, t2->bt);
 705         tmp_pop_bt(bt, r1);
 706         tmp_pop_bt(bt, *reg);
 707         regop1(op, *reg, r1, bt);
 708         return bt;
 709 }
 710
 711 static long c_add(long a, long b, unsigned bt)
 712 {
 713         return a + b;
 714 }
 715
 716 void o_add(void)
 717 {
 718         int reg;
 719         int bt;
 720         if (!c_binop(c_add, 0))
 721                 return;
 722         bt = binop(ADD_R2X, &reg);
 723         tmp_push_reg(bt, reg);
 724 }
 725
 726 static long c_xor(long a, long b, unsigned bt)
 727 {
 728         return a ^ b;
 729 }
 730
 731 void o_xor(void)
 732 {
 733         int reg;
 734         int bt;
 735         if (!c_binop(c_xor, 0))
 736                 return;
 737         bt = binop(XOR_R2X, &reg);
 738         tmp_push_reg(bt, reg);
 739 }
 740
 741 static long c_and(long a, long b, unsigned bt)
 742 {
 743         return a & b;
 744 }
 745
 746 void o_and(void)
 747 {
 748         int reg;
 749         int bt;
 750         if (!c_binop(c_and, 0))
 751                 return;
 752         bt = binop(AND_R2X, &reg);
 753         tmp_push_reg(bt, reg);
 754 }
 755
 756 static long c_or(long a, long b, unsigned bt)
 757 {
 758         return a | b;
 759 }
 760
 761 void o_or(void)
 762 {
 763         int reg;
 764         int bt;
 765         if (!c_binop(c_or, 0))
 766                 return;
 767         bt = binop(OR_R2X, &reg);
 768         tmp_push_reg(bt, reg);
 769 }
 770
 771 static long c_sub(long a, long b, unsigned bt)
 772 {
 773         return a - b;
 774 }
 775
 776 void o_sub(void)
 777 {
 778         int reg;
 779         int bt;
 780         if (!c_binop(c_sub, 0))
 781                 return;
 782         bt = binop(SUB_R2X, &reg);
 783         tmp_push_reg(bt, reg);
 784 }
 785
 786 static void o_cmp(int uop, int sop)
 787 {
 788         char set[] = "\x0f\x00\xc0";
 789         int reg;
 790         int bt = binop(CMP_R2X, &reg);
 791         set[1] = bt & BT_SIGNED ? sop : uop;
 792         reg_free(R_RAX);
 793         cmp_setl = codeaddr();
 794         os(set, 3);                     /* setl %al */
 795         os("\x0f\xb6\xc0", 3);          /* movzbl %al, %eax */
 796         tmp_push_reg(4 | BT_SIGNED, R_RAX);
 797         cmp_last = codeaddr();
 798 }
 799
 800 static long c_lt(long a, long b, unsigned bt)
 801 {
 802         return a < b;
 803 }
 804
 805 void o_lt(void)
 806 {
 807         if (!c_binop(c_lt, 4))
 808                 return;
 809         o_cmp(0x92, 0x9c);
 810 }
 811
 812 static long c_gt(long a, long b, unsigned bt)
 813 {
 814         return a > b;
 815 }
 816
 817 void o_gt(void)
 818 {
 819         if (!c_binop(c_gt, 4))
 820                 return;
 821         o_cmp(0x97, 0x9f);
 822 }
 823
 824 static long c_le(long a, long b, unsigned bt)
 825 {
 826         return a <= b;
 827 }
 828
 829 void o_le(void)
 830 {
 831         if (!c_binop(c_le, 4))
 832                 return;
 833         o_cmp(0x96, 0x9e);
 834 }
 835
 836 static long c_ge(long a, long b, unsigned bt)
 837 {
 838         return a >= b;
 839 }
 840
 841 void o_ge(void)
 842 {
 843         if (!c_binop(c_ge, 4))
 844                 return;
 845         o_cmp(0x93, 0x9d);
 846 }
 847
 848 static long c_eq(long a, long b, unsigned bt)
 849 {
 850         return a == b;
 851 }
 852
 853 void o_eq(void)
 854 {
 855         if (!c_binop(c_eq, 4))
 856                 return;
 857         o_cmp(0x94, 0x94);
 858 }
 859
 860 static long c_neq(long a, long b, unsigned bt)
 861 {
 862         return a != b;
 863 }
 864
 865 void o_neq(void)
 866 {
 867         if (!c_binop(c_neq, 4))
 868                 return;
 869         o_cmp(0x95, 0x95);
 870 }
 871
 872 static long c_lnot(long a, unsigned bt)
 873 {
 874         return !a;
 875 }
 876
 877 void o_lnot(void)
 878 {
 879         if (!c_op(c_lnot, 4))
 880                 return;
 881         if (cmp_last == codeaddr()) {
 882                 buf[cmp_setl + 1] ^= 0x10;
 883         } else {
 884                 o_num(0, 4 | BT_SIGNED);
 885                 o_eq();
 886         }
 887 }
 888
 889 static long c_neg(long a, unsigned bt)
 890 {
 891         return -a;
 892 }
 893
 894 void o_neg(void)
 895 {
 896         struct tmp *t = &tmp[ntmp - 1];
 897         int reg;
 898         unsigned bt = BT_TMPBT(t->bt);
 899         if (!c_op(c_neg, t->bt | BT_SIGNED))
 900                 return;
 901         reg = TMP_REG(t);
 902         tmp_pop_bt(bt, reg);
 903         regop1(NEG_REG, 3, reg, bt);
 904         tmp_push_reg(bt, reg);
 905 }
 906
 907 static long c_not(long a, unsigned bt)
 908 {
 909         return ~a;
 910 }
 911
 912 void o_not(void)
 913 {
 914         struct tmp *t = &tmp[ntmp - 1];
 915         int reg;
 916         unsigned bt = BT_TMPBT(t->bt);
 917         if (!c_op(c_not, 0))
 918                 return;
 919         reg = TMP_REG(t);
 920         tmp_pop_bt(bt, reg);
 921         regop1(NOT_REG, 2, reg, bt);
 922         tmp_push_reg(t->bt, reg);
 923 }
 924
 925 void o_func_end(void)
 926 {
 927         int i;
 928         for (i = 0; i < nret; i++)
 929                 o_filljmp(ret[i]);
 930         os("\xc9\xc3", 2);              /* leave; ret; */
 931         putint(buf + spsub_addr, (maxsp + 7) & ~0x07, 4);
 932         out_func_end(buf, cur - buf);
 933 }
 934
 935 long o_mklocal(int size)
 936 {
 937         return sp_push((size + 7) & ~0x07);
 938 }
 939
 940 void o_rmlocal(long addr, int sz)
 941 {
 942         sp = addr - sz;
 943 }
 944
 945 static int arg_regs[] = {R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
 946
 947 #define R_NARGS                 ARRAY_SIZE(arg_regs)
 948
 949 long o_arg(int i, unsigned bt)
 950 {
 951         long addr;
 952         if (i < R_NARGS) {
 953                 addr = o_mklocal(BT_SZ(bt));
 954                 memop1(MOV_R2X, arg_regs[i], R_RBP, -addr, bt);
 955         } else {
 956                 addr = -8 * (i - R_NARGS + 2);
 957         }
 958         return addr;
 959 }
 960
 961 void o_assign(unsigned bt)
 962 {
 963         struct tmp *t1 = &tmp[ntmp - 1];
 964         struct tmp *t2 = &tmp[ntmp - 2];
 965         int r1 = BT_SZ(bt) > 1 ? TMP_REG(t1) : TMP_BYTEREG(t1);
 966         int reg;
 967         int off;
 968         tmp_pop_bt(BT_TMPBT(bt), r1);
 969         if (t2->flags & LOC_LOCAL) {
 970                 reg = R_RBP;
 971                 off = t2->addr;
 972                 o_tmpdrop(1);
 973         } else {
 974                 reg = TMP_REG2(t2, r1);
 975                 off = 0;
 976                 tmp_pop(0, reg);
 977         }
 978         memop1(MOV_R2X, r1, reg, off, bt);
 979         tmp_push_reg(bt, r1);
 980 }
 981
 982 static void tmp_to(struct tmp *t, int reg)
 983 {
 984         reg_for(reg, t);
 985         tmp_reg(t, reg, t->bt, 0);
 986 }
 987
 988 void o_memcpy(int sz)
 989 {
 990         struct tmp *t0 = &tmp[ntmp];
 991         struct tmp *t1 = &tmp[ntmp - 1];
 992         struct tmp *t2 = &tmp[ntmp - 2];
 993         o_num(sz, 4);
 994         tmp_to(t0, R_RCX);
 995         tmp_to(t1, R_RSI);
 996         tmp_to(t2, R_RDI);
 997         os("\xf3\xa4", 2);              /* rep movs */
 998         o_tmpdrop(2);
 999 }
1000
1001 void o_memset(int x, int sz)
1002 {
1003         struct tmp *t0 = &tmp[ntmp + 1];
1004         struct tmp *t1 = &tmp[ntmp];
1005         struct tmp *t2 = &tmp[ntmp - 1];
1006         o_num(sz, 4);
1007         o_num(x, 4);
1008         tmp_to(t0, R_RAX);
1009         tmp_to(t1, R_RCX);
1010         tmp_to(t2, R_RDI);
1011         os("\xf3\xaa", 2);              /* rep stosb */
1012         o_tmpdrop(2);
1013 }
1014
1015 long o_mklabel(void)
1016 {
1017         return codeaddr();
1018 }
1019
1020 static long jx(int x, long addr)
1021 {
1022         char op[2] = {0x0f};
1023         op[1] = x;
1024         os(op, 2);              /* jx $addr */
1025         oi(addr - codeaddr() - 4, 4);
1026         return codeaddr() - 4;
1027 }
1028
1029 static long jxtest(int x, long addr)
1030 {
1031         int bt = tmp_pop(1, R_RAX);
1032         regop1(TEST_R2R, R_RAX, R_RAX, bt);
1033         return jx(x, addr);
1034 }
1035
1036 static long jxcmp(long addr, int inv)
1037 {
1038         int x;
1039         if (codeaddr() != cmp_last)
1040                 return -1;
1041         o_tmpdrop(1);
1042         cur = buf + cmp_setl;
1043         x = (unsigned char) buf[cmp_setl + 1];
1044         return jx((inv ? x : x ^ 0x01) & ~0x10, addr);
1045 }
1046
1047 long o_jz(long addr)
1048 {
1049         long ret = jxcmp(addr, 0);
1050         return ret != -1 ? ret : jxtest(0x84, addr);
1051 }
1052
1053 long o_jnz(long addr)
1054 {
1055         long ret = jxcmp(addr, 1);
1056         return ret != -1 ? ret : jxtest(0x85, addr);
1057 }
1058
1059 long o_jmp(long addr)
1060 {
1061         os("\xe9", 1);                  /* jmp $addr */
1062         oi(addr - codeaddr() - 4, 4);
1063         return codeaddr() - 4;
1064 }
1065
1066 void o_filljmp2(long addr, long jmpdst)
1067 {
1068         putint(buf + addr, jmpdst - addr - 4, 4);
1069 }
1070
1071 void o_filljmp(long addr)
1072 {
1073         o_filljmp2(addr, codeaddr());
1074 }
1075
1076 void o_call(int argc, unsigned *bt, unsigned ret_bt)
1077 {
1078         int i;
1079         struct tmp *t;
1080         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
1081                 if (regs[tmpregs[i]] && regs[tmpregs[i]] - tmp < ntmp - argc)
1082                         tmp_mem(regs[tmpregs[i]]);
1083         if (argc > R_NARGS) {
1084                 long addr = sp_push(8 * (argc - R_NARGS));
1085                 for (i = argc - 1; i >= R_NARGS; --i) {
1086                         int reg = TMP_REG(&tmp[ntmp - 1]);
1087                         tmp_pop_bt(bt[i], reg);
1088                         memop1(MOV_R2X, reg, R_RBP,
1089                                 -(addr - (i - R_NARGS) * 8), BT_TMPBT(bt[i]));
1090                 }
1091         }
1092         for (i = MIN(argc, R_NARGS) - 1; i >= 0; i--)
1093                 tmp_pop_bt(bt[i], arg_regs[i]);
1094         t = &tmp[ntmp - 1];
1095         if (t->flags & LOC_SYM) {
1096                 os("\x31\xc0", 2);      /* xor %eax, %eax */
1097                 os("\xe8", 1);          /* call $x */
1098                 if (!nogen)
1099                         out_rela(t->addr, codeaddr(), 1);
1100                 oi(-4 + t->off, 4);
1101                 o_tmpdrop(1);
1102         } else {
1103                 tmp_pop(0, R_RAX);
1104                 regop1(CALL_REG, 2, R_RAX, 4);
1105         }
1106         if (ret_bt)
1107                 tmp_push_reg(ret_bt, R_RAX);
1108 }
1109
1110 int o_nogen(void)
1111 {
1112         return nogen++;
1113 }
1114
1115 void o_dogen(void)
1116 {
1117         nogen = 0;
1118 }
1119
1120 void o_datset(long addr, int off, unsigned bt)
1121 {
1122         struct tmp *t = &tmp[ntmp - 1];
1123         if (t->flags & LOC_NUM && !(t->flags & TMP_ADDR)) {
1124                 num_cast(t, bt);
1125                 out_datcpy(addr, off, (void *) &t->addr, BT_SZ(bt));
1126         }
1127         if (t->flags & LOC_SYM && !(t->flags & TMP_ADDR)) {
1128                 out_datrela(tmp->addr, addr, off);
1129                 out_datcpy(addr, off, (void *) &t->off, BT_SZ(bt));
1130         }
1131         o_tmpdrop(1);
1132 }