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