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 #define TMP(i)          (&tmps[ntmp - 1 - (i)])
  70
  71 static struct tmp {
  72         long addr;
  73         long off;       /* used for LOC_SYM; offset from a symbol address */
  74         unsigned flags;
  75         unsigned bt;
  76 } tmps[MAXTMP];
  77 static int ntmp;
  78
  79 static int tmpsp;
  80
  81 static struct tmp *regs[NREGS];
  82 static int tmpregs[] = {R_RAX, R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
  83
  84 #define MAXRET                  (1 << 8)
  85
  86 static long ret[MAXRET];
  87 static int nret;
  88
  89 static long cmp_last;
  90 static long cmp_setl;
  91
  92 static void putint(char *s, long n, int l)
  93 {
  94         if (nogen)
  95                 return;
  96         while (l--) {
  97                 *s++ = n;
  98                 n >>= 8;
  99         }
 100 }
 101
 102 static void os(char *s, int n)
 103 {
 104         if (nogen)
 105                 return;
 106         while (n--)
 107                 *cur++ = *s++;
 108 }
 109
 110 static void oi(long n, int l)
 111 {
 112         while (l--) {
 113                 *cur++ = n;
 114                 n >>= 8;
 115         }
 116 }
 117
 118 static long codeaddr(void)
 119 {
 120         return cur - buf;
 121 }
 122
 123 static void o_op(int *op, int nop, int r1, int r2, unsigned bt)
 124 {
 125         int rex = 0;
 126         int i;
 127         if (r1 & 0x8)
 128                 rex |= 4;
 129         if (r2 & 0x8)
 130                 rex |= 1;
 131         if (BT_SZ(bt) == 8)
 132                 rex |= 8;
 133         if (rex || (bt & BT_SZMASK) == 8)
 134                 oi(0x40 | rex, 1);
 135         if ((bt & BT_SZMASK) == 2)
 136                 oi(0x66, 1);
 137         if ((bt & BT_SZMASK) == 1)
 138                 op[nop - 1] &= ~0x1;
 139         for (i = 0; i < nop; i++)
 140                 oi(op[i], 1);
 141 }
 142
 143 static void memop(int *op, int nop, int src, int base, int off, unsigned bt)
 144 {
 145         int dis = off == (char) off ? 1 : 4;
 146         int mod = dis == 4 ? 2 : 1;
 147         o_op(op, nop, src, base, bt);
 148         if (!off)
 149                 mod = 0;
 150         oi((mod << 6) | ((src & 0x07) << 3) | (base & 0x07), 1);
 151         if (off)
 152                 oi(off, dis);
 153 }
 154
 155 static void memop1(int op, int src, int base, int off, unsigned bt)
 156 {
 157         memop(&op, 1, src, base, off, bt);
 158 }
 159
 160 static void regop(int *op, int nop, int src, int dst, unsigned bt)
 161 {
 162         o_op(op, nop, src, dst, bt);
 163         oi((3 << 6) | (src << 3) | (dst & 0x07), 1);
 164 }
 165
 166 static void regop1(int op, int src, int dst, unsigned bt)
 167 {
 168         regop(&op, 1, src, dst, bt);
 169 }
 170
 171 static long sp_push(int size)
 172 {
 173         sp += size;
 174         if (sp > maxsp)
 175                 maxsp = sp;
 176         return sp;
 177 }
 178
 179 #define LOC_NEW(f, l)           (((f) & ~LOC_MASK) | (l))
 180
 181 static void tmp_mem(struct tmp *tmp)
 182 {
 183         int src = tmp->addr;
 184         if (!(tmp->flags & LOC_REG))
 185                 return;
 186         if (tmpsp == -1)
 187                 tmpsp = sp;
 188         tmp->addr = -sp_push(8);
 189         memop1(MOV_R2X, src, R_RBP, tmp->addr, BT_TMPBT(TMP_BT(tmp)));
 190         regs[src] = NULL;
 191         tmp->flags = LOC_NEW(tmp->flags, LOC_MEM);
 192 }
 193
 194 static int *movxx_x2r(int bt)
 195 {
 196         static int movxx[2] = {0x0f};
 197         if (BT_SZ(bt) == 1)
 198                 movxx[1] = bt & BT_SIGNED ? 0xbe : 0xb6;
 199         else
 200                 movxx[1] = bt & BT_SIGNED ? 0xbf : 0xb7;
 201         return movxx;
 202 }
 203
 204 #define MOVSXD          0x63
 205
 206 static void mov_r2r(int r1, int r2, unsigned bt1, unsigned bt2)
 207 {
 208         int s1 = bt1 & BT_SIGNED;
 209         int s2 = bt2 & BT_SIGNED;
 210         int sz1 = BT_SZ(bt1);
 211         int sz2 = BT_SZ(bt2);
 212         if (sz2 < 4 && (sz1 >= sz2 && s1 != s2)) {
 213                 regop(movxx_x2r(bt2), 2, r1, r2, 4);
 214                 return;
 215         }
 216         if (sz1 == 4 && sz2 == 8) {
 217                 regop1(MOVSXD, r2, r1, sz2);
 218                 return;
 219         }
 220         if (r1 != r2 || sz1 > sz2)
 221                 regop1(MOV_R2X, r1, r2, BT_TMPBT(bt2));
 222 }
 223
 224 static void mov_m2r(int dst, int base, int off, int bt1, int bt2)
 225 {
 226         if (BT_SZ(bt1) < 4) {
 227                 memop(movxx_x2r(bt1), 2, dst, base, off,
 228                         bt1 & BT_SIGNED && BT_SZ(bt2) == 8 ? 8 : 4);
 229                 mov_r2r(dst, dst, bt1, bt2);
 230         } else {
 231                 memop1(MOV_M2R, dst, base, off, bt1);
 232                 mov_r2r(dst, dst, bt1, bt2);
 233         }
 234 }
 235
 236 static void num_cast(struct tmp *t, unsigned bt)
 237 {
 238         if (!(bt & BT_SIGNED) && BT_SZ(bt) != 8)
 239                 t->addr &= ((1l << (long) (BT_SZ(bt) * 8)) - 1);
 240         if (bt & BT_SIGNED && BT_SZ(bt) != 8 &&
 241                                 t->addr > (1l << (BT_SZ(bt) * 8 - 1)))
 242                 t->addr = -((1l << (BT_SZ(bt) * 8)) - t->addr);
 243         t->bt = bt;
 244 }
 245
 246 static void num_reg(int reg, unsigned bt, long num)
 247 {
 248         int op = MOV_I2R + (reg & 7);
 249         if (BT_SZ(bt) == 8 && num >= 0 && num == (unsigned) num)
 250                 bt = 4;
 251         o_op(&op, 1, 0, reg, bt);
 252         oi(num, BT_SZ(bt));
 253 }
 254
 255 static void tmp_reg(struct tmp *tmp, int dst, unsigned bt, int deref)
 256 {
 257         if (deref && tmp->flags & TMP_ADDR)
 258                 tmp->flags &= ~TMP_ADDR;
 259         else
 260                 deref = 0;
 261         if (tmp->flags & LOC_NUM) {
 262                 num_cast(tmp, bt);
 263                 tmp->bt = BT_TMPBT(bt);
 264                 num_reg(dst, tmp->bt, tmp->addr);
 265                 tmp->addr = dst;
 266                 regs[dst] = tmp;
 267                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 268         }
 269         if (tmp->flags & LOC_SYM) {
 270                 regop1(MOV_I2X, 0, dst, TMP_BT(tmp));
 271                 if (!nogen)
 272                         out_rela(tmp->addr, codeaddr(), 0);
 273                 oi(tmp->off, 4);
 274                 tmp->addr = dst;
 275                 regs[dst] = tmp;
 276                 tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 277         }
 278         if (tmp->flags & LOC_REG) {
 279                 if (deref)
 280                         mov_m2r(dst, tmp->addr, 0, tmp->bt, bt);
 281                 else
 282                         mov_r2r(tmp->addr, dst, TMP_BT(tmp),
 283                                 tmp->flags & TMP_ADDR ? 8 : bt);
 284                 regs[tmp->addr] = NULL;
 285         }
 286         if (tmp->flags & LOC_LOCAL) {
 287                 if (deref)
 288                         mov_m2r(dst, R_RBP, tmp->addr, tmp->bt, bt);
 289                 else
 290                         memop1(LEA_M2R, dst, R_RBP, tmp->addr, 8);
 291         }
 292         if (tmp->flags & LOC_MEM) {
 293                 mov_m2r(dst, R_RBP, tmp->addr,
 294                         deref ? 8 : TMP_BT(tmp), deref ? 8 : bt);
 295                 if (deref)
 296                         mov_m2r(dst, dst, 0, tmp->bt, bt);
 297         }
 298         tmp->addr = dst;
 299         tmp->bt = tmp->flags & TMP_ADDR ? bt : BT_TMPBT(bt);
 300         regs[dst] = tmp;
 301         tmp->flags = LOC_NEW(tmp->flags, LOC_REG);
 302 }
 303
 304 static void reg_free(int reg)
 305 {
 306         int i;
 307         if (!regs[reg])
 308                 return;
 309         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 310                 if (!regs[tmpregs[i]]) {
 311                         tmp_reg(regs[reg], tmpregs[i], regs[reg]->bt, 0);
 312                         return;
 313                 }
 314         tmp_mem(regs[reg]);
 315 }
 316
 317 static void reg_for(int reg, struct tmp *t)
 318 {
 319         if (regs[reg] && regs[reg] != t)
 320                 reg_free(reg);
 321 }
 322
 323 static void tmp_mv(struct tmp *t, int reg)
 324 {
 325         reg_for(reg, t);
 326         tmp_reg(t, reg, t->bt, 0);
 327 }
 328
 329 static void tmp_to(struct tmp *t, int reg, int bt)
 330 {
 331         reg_for(reg, t);
 332         tmp_reg(t, reg, bt ? bt : t->bt, 1);
 333 }
 334
 335 static void tmp_drop(int n)
 336 {
 337         int i;
 338         for (i = ntmp - n; i < ntmp; i++)
 339                 if (tmps[i].flags & LOC_REG)
 340                         regs[tmps[i].addr] = NULL;
 341         cmp_last = -1;
 342         ntmp -= n;
 343 }
 344
 345 static int tmp_pop(int reg, int bt)
 346 {
 347         struct tmp *t = TMP(0);
 348         tmp_to(t, reg, bt);
 349         tmp_drop(1);
 350         return t->bt;
 351 }
 352
 353 static struct tmp *tmp_new(void)
 354 {
 355         cmp_last = -1;
 356         return &tmps[ntmp++];
 357 }
 358
 359 static void tmp_push(int reg, unsigned bt)
 360 {
 361         struct tmp *t = tmp_new();
 362         t->addr = reg;
 363         t->bt = bt;
 364         t->flags = LOC_REG;
 365         regs[reg] = t;
 366 }
 367
 368 void o_local(long addr, unsigned bt)
 369 {
 370         struct tmp *t = tmp_new();
 371         t->addr = -addr;
 372         t->bt = bt;
 373         t->flags = LOC_LOCAL | TMP_ADDR;
 374 }
 375
 376 void o_num(long num, unsigned bt)
 377 {
 378         struct tmp *t = tmp_new();
 379         t->addr = num;
 380         t->bt = bt;
 381         t->flags = LOC_NUM;
 382 }
 383
 384 void o_symaddr(long addr, unsigned bt)
 385 {
 386         struct tmp *t = tmp_new();
 387         t->bt = bt;
 388         t->addr = addr;
 389         t->flags = LOC_SYM | TMP_ADDR;
 390         t->off = 0;
 391 }
 392
 393 void o_tmpdrop(int n)
 394 {
 395         int i;
 396         if (n == -1 || n > ntmp)
 397                 n = ntmp;
 398         tmp_drop(n);
 399         if (!ntmp) {
 400                 if (tmpsp != -1)
 401                         sp = tmpsp;
 402                 tmpsp = -1;
 403         }
 404 }
 405
 406 #define FORK_REG                R_RAX
 407
 408 void o_tmpfork(void)
 409 {
 410         tmp_pop(FORK_REG, 0);
 411 }
 412
 413 void o_tmpjoin(void)
 414 {
 415         tmp_to(TMP(0), FORK_REG, 0);
 416 }
 417
 418 void o_tmpswap(void)
 419 {
 420         struct tmp *t1 = TMP(0);
 421         struct tmp *t2 = TMP(1);
 422         struct tmp t;
 423         memcpy(&t, t1, sizeof(t));
 424         memcpy(t1, t2, sizeof(t));
 425         memcpy(t2, &t, sizeof(t));
 426         if (t1->flags & LOC_REG)
 427                 regs[t1->addr] = t1;
 428         if (t2->flags & LOC_REG)
 429                 regs[t2->addr] = t2;
 430 }
 431
 432 static int reg_get(int mask)
 433 {
 434         int i;
 435         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 436                 if ((1 << tmpregs[i]) & mask && !regs[tmpregs[i]])
 437                         return tmpregs[i];
 438         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
 439                 if ((1 << tmpregs[i]) & mask) {
 440                         reg_free(tmpregs[i]);
 441                         return tmpregs[i];
 442                 }
 443         return 0;
 444 }
 445
 446 void o_tmpcopy(void)
 447 {
 448         struct tmp *t1 = TMP(0);
 449         struct tmp *t2 = tmp_new();
 450         memcpy(t2, t1, sizeof(*t1));
 451         if (!(t1->flags & (LOC_REG | LOC_MEM)))
 452                 return;
 453         if (t1->flags & LOC_MEM) {
 454                 tmp_reg(t2, reg_get(~0), t2->bt, 0);
 455         } else if (t1->flags & LOC_REG) {
 456                 t2->addr = reg_get(~(1 << t1->addr));
 457                 regop1(MOV_R2X, t1->addr, t2->addr, BT_TMPBT(TMP_BT(t1)));
 458                 regs[t2->addr] = t2;
 459         }
 460         t2->flags = t1->flags;
 461 }
 462
 463 void o_cast(unsigned bt)
 464 {
 465         struct tmp *t = TMP(0);
 466         int reg;
 467         if (t->bt == bt)
 468                 return;
 469         if (t->flags & LOC_NUM) {
 470                 num_cast(t, bt);
 471                 return;
 472         }
 473         reg = BT_SZ(bt) == 1 ? TMP_BYTEREG(t) : TMP_REG(t);
 474         tmp_to(t, reg, bt);
 475 }
 476
 477 long o_func_beg(char *name, int global)
 478 {
 479         long addr = out_func_beg(name, global);
 480         cur = buf;
 481         os("\x55", 1);                  /* push %rbp */
 482         os("\x48\x89\xe5", 3);          /* mov %rsp, %rbp */
 483         sp = 0;
 484         maxsp = 0;
 485         ntmp = 0;
 486         tmpsp = -1;
 487         nret = 0;
 488         cmp_last = -1;
 489         memset(regs, 0, sizeof(regs));
 490         os("\x48\x81\xec", 3);          /* sub $xxx, %rsp */
 491         spsub_addr = codeaddr();
 492         oi(0, 4);
 493         return addr;
 494 }
 495
 496 void o_deref(unsigned bt)
 497 {
 498         struct tmp *t = TMP(0);
 499         if (t->flags & TMP_ADDR)
 500                 tmp_to(t, TMP_REG(t), t->bt);
 501         t->bt = bt;
 502         t->flags |= TMP_ADDR;
 503 }
 504
 505 void o_load(void)
 506 {
 507         struct tmp *t = TMP(0);
 508         tmp_to(t, TMP_REG(t), t->bt);
 509 }
 510
 511 static unsigned bt_op(unsigned bt1, unsigned bt2)
 512 {
 513         unsigned s1 = BT_SZ(bt1);
 514         unsigned s2 = BT_SZ(bt2);
 515         unsigned bt = (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 516         return BT_TMPBT(bt);
 517 }
 518
 519 #define TMP_CONST(t)    ((t)->flags & LOC_NUM && !((t)->flags & TMP_ADDR))
 520 #define LOCAL_PTR(t)    ((t)->flags & LOC_LOCAL && !((t)->flags & TMP_ADDR))
 521 #define SYM_PTR(t)      ((t)->flags & LOC_LOCAL && !((t)->flags & TMP_ADDR))
 522
 523 int o_popnum(long *c)
 524 {
 525         struct tmp *t = TMP(0);
 526         if (!TMP_CONST(t))
 527                 return 1;
 528         *c = t->addr;
 529         tmp_drop(1);
 530         return 0;
 531 }
 532
 533 static int c_binop(long (*cop)(long a, long b, unsigned bt), unsigned bt)
 534 {
 535         struct tmp *t1 = TMP(0);
 536         struct tmp *t2 = TMP(1);
 537         int locals = LOCAL_PTR(t1) + LOCAL_PTR(t2);
 538         int syms = SYM_PTR(t1) + SYM_PTR(t2);
 539         int nums = TMP_CONST(t1) + TMP_CONST(t2);
 540         if (syms == 2 || syms && locals || syms + nums + locals != 2)
 541                 return 1;
 542         if (!bt) {
 543                 if (!locals)
 544                         bt = syms ? 8 : bt_op(t1->bt, t2->bt);
 545                 if (locals == 1)
 546                         bt = 8;
 547                 if (locals == 2)
 548                         bt = 4 | BT_SIGNED;
 549         }
 550         if (syms) {
 551                 long o1 = SYM_PTR(t1) ? t1->off : t1->addr;
 552                 long o2 = SYM_PTR(t2) ? t2->off : t2->addr;
 553                 long ret = cop(o2, o1, bt);
 554                 if (!SYM_PTR(t2))
 555                         o_tmpswap();
 556                 t2->off = ret;
 557                 tmp_drop(1);
 558         } else {
 559                 long ret = cop(t2->addr, t1->addr, locals ? 4 | BT_SIGNED : bt);
 560                 tmp_drop(2);
 561                 if (locals == 1) {
 562                         o_local(-ret, bt);
 563                         o_addr();
 564                 } else {
 565                         o_num(ret, bt);
 566                 }
 567         }
 568         return 0;
 569 }
 570
 571 static int c_op(long (*cop)(long a, unsigned bt), unsigned bt)
 572 {
 573         struct tmp *t1 = TMP(0);
 574         long ret;
 575         if (!TMP_CONST(t1))
 576                 return 1;
 577         if (!bt)
 578                 bt = t1->bt;
 579         ret = cop(t1->addr, bt);
 580         tmp_drop(1);
 581         o_num(ret, bt);
 582         return 0;
 583 }
 584
 585 static void shx(int uop, int sop)
 586 {
 587         struct tmp *t2 = TMP(1);
 588         int r2 = TMP_REG2(t2, R_RCX);
 589         int bt;
 590         tmp_pop(R_RCX, 0);
 591         bt = tmp_pop(r2, 0);
 592         regop1(SHX_REG, bt & BT_SIGNED ? sop : uop, r2, BT_TMPBT(bt));
 593         tmp_push(r2, bt);
 594 }
 595
 596 static long c_shl(long a, long b, unsigned bt)
 597 {
 598         return a << b;
 599 }
 600
 601 void o_shl(void)
 602 {
 603         if (!c_binop(c_shl, 0))
 604                 return;
 605         shx(4, 4);
 606 }
 607
 608 static long c_shr(long a, long b, unsigned bt)
 609 {
 610         if (bt & BT_SIGNED)
 611                 return a >> b;
 612         else
 613                 return (unsigned long) a >> b;
 614 }
 615
 616 void o_shr(void)
 617 {
 618         if (!c_binop(c_shr, 0))
 619                 return;
 620         shx(5, 7);
 621 }
 622
 623 static int mulop(int uop, int sop, int reg)
 624 {
 625         struct tmp *t1 = TMP(0);
 626         struct tmp *t2 = TMP(1);
 627         int bt1 = TMP_BT(t1);
 628         int bt2 = TMP_BT(t2);
 629         int bt = bt_op(bt1, bt2);
 630         if (t1->flags & LOC_REG && t1->addr != R_RAX && t1->addr != R_RDX)
 631                 reg = t1->addr;
 632         tmp_to(t1, reg, bt);
 633         tmp_to(t2, R_RAX, bt);
 634         if (reg != R_RDX) {
 635                 int cqo = 0x99;
 636                 reg_free(R_RDX);
 637                 if (bt & BT_SIGNED)
 638                         o_op(&cqo, 1, R_RAX, R_RDX, bt);
 639                 else
 640                         regop1(XOR_R2X, R_RDX, R_RDX, bt);
 641         }
 642         tmp_drop(2);
 643         regop1(MUL_A2X, bt & BT_SIGNED ? sop : uop, reg, BT_TMPBT(bt2));
 644         return bt;
 645 }
 646
 647 static long c_mul(long a, long b, unsigned bt)
 648 {
 649         return a * b;
 650 }
 651
 652 void o_mul(void)
 653 {
 654         int bt;
 655         if (!c_binop(c_mul, 0))
 656                 return;
 657         bt = mulop(4, 5, R_RDX);
 658         tmp_push(R_RAX, bt);
 659 }
 660
 661 static long c_div(long a, long b, unsigned bt)
 662 {
 663         return a / b;
 664 }
 665
 666 void o_div(void)
 667 {
 668         int bt;
 669         if (!c_binop(c_div, 0))
 670                 return;
 671         bt = mulop(6, 7, R_RCX);
 672         tmp_push(R_RAX, bt);
 673 }
 674
 675 static long c_mod(long a, long b, unsigned bt)
 676 {
 677         return a % b;
 678 }
 679
 680 void o_mod(void)
 681 {
 682         int bt;
 683         if (!c_binop(c_mod, 0))
 684                 return;
 685         bt = mulop(6, 7, R_RCX);
 686         tmp_push(R_RDX, bt);
 687 }
 688
 689 void o_addr(void)
 690 {
 691         tmps[ntmp - 1].flags &= ~TMP_ADDR;
 692         tmps[ntmp - 1].bt = 8;
 693 }
 694
 695 void o_ret(unsigned bt)
 696 {
 697         if (bt)
 698                 tmp_pop(R_RAX, bt);
 699         else
 700                 os("\x31\xc0", 2);      /* xor %eax, %eax */
 701         ret[nret++] = o_jmp(0);
 702 }
 703
 704 static int binop(int op, int *reg)
 705 {
 706         struct tmp *t1 = TMP(0);
 707         struct tmp *t2 = TMP(1);
 708         int r1, r2;
 709         unsigned bt = bt_op(t1->bt, t2->bt);
 710         r1 = TMP_REG(t1);
 711         r2 = TMP_REG2(t2, r1);
 712         tmp_pop(r1, bt);
 713         tmp_pop(r2, bt);
 714         regop1(op, r2, r1, bt);
 715         *reg = r2;
 716         return bt;
 717 }
 718
 719 static long c_add(long a, long b, unsigned bt)
 720 {
 721         return a + b;
 722 }
 723
 724 void o_add(void)
 725 {
 726         int reg;
 727         int bt;
 728         if (!c_binop(c_add, 0))
 729                 return;
 730         bt = binop(ADD_R2X, &reg);
 731         tmp_push(reg, bt);
 732 }
 733
 734 static long c_xor(long a, long b, unsigned bt)
 735 {
 736         return a ^ b;
 737 }
 738
 739 void o_xor(void)
 740 {
 741         int reg;
 742         int bt;
 743         if (!c_binop(c_xor, 0))
 744                 return;
 745         bt = binop(XOR_R2X, &reg);
 746         tmp_push(reg, bt);
 747 }
 748
 749 static long c_and(long a, long b, unsigned bt)
 750 {
 751         return a & b;
 752 }
 753
 754 void o_and(void)
 755 {
 756         int reg;
 757         int bt;
 758         if (!c_binop(c_and, 0))
 759                 return;
 760         bt = binop(AND_R2X, &reg);
 761         tmp_push(reg, bt);
 762 }
 763
 764 static long c_or(long a, long b, unsigned bt)
 765 {
 766         return a | b;
 767 }
 768
 769 void o_or(void)
 770 {
 771         int reg;
 772         int bt;
 773         if (!c_binop(c_or, 0))
 774                 return;
 775         bt = binop(OR_R2X, &reg);
 776         tmp_push(reg, bt);
 777 }
 778
 779 static long c_sub(long a, long b, unsigned bt)
 780 {
 781         return a - b;
 782 }
 783
 784 void o_sub(void)
 785 {
 786         int reg;
 787         int bt;
 788         if (!c_binop(c_sub, 0))
 789                 return;
 790         bt = binop(SUB_R2X, &reg);
 791         tmp_push(reg, bt);
 792 }
 793
 794 static void o_cmp(int uop, int sop)
 795 {
 796         struct tmp *t1 = TMP(0);
 797         struct tmp *t2 = TMP(1);
 798         char set[] = "\x0f\x00\xc0";
 799         int reg;
 800         int bt;
 801         if (regs[R_RAX] && regs[R_RAX] != t1 && regs[R_RAX] != t2)
 802                 reg_free(R_RAX);
 803         bt = binop(CMP_R2X, &reg);
 804         set[1] = bt & BT_SIGNED ? sop : uop;
 805         cmp_setl = codeaddr();
 806         os(set, 3);                     /* setl %al */
 807         os("\x0f\xb6\xc0", 3);          /* movzbl %al, %eax */
 808         tmp_push(R_RAX, 4 | BT_SIGNED);
 809         cmp_last = codeaddr();
 810 }
 811
 812 static long c_lt(long a, long b, unsigned bt)
 813 {
 814         return a < b;
 815 }
 816
 817 void o_lt(void)
 818 {
 819         if (!c_binop(c_lt, 4))
 820                 return;
 821         o_cmp(0x92, 0x9c);
 822 }
 823
 824 static long c_gt(long a, long b, unsigned bt)
 825 {
 826         return a > b;
 827 }
 828
 829 void o_gt(void)
 830 {
 831         if (!c_binop(c_gt, 4))
 832                 return;
 833         o_cmp(0x97, 0x9f);
 834 }
 835
 836 static long c_le(long a, long b, unsigned bt)
 837 {
 838         return a <= b;
 839 }
 840
 841 void o_le(void)
 842 {
 843         if (!c_binop(c_le, 4))
 844                 return;
 845         o_cmp(0x96, 0x9e);
 846 }
 847
 848 static long c_ge(long a, long b, unsigned bt)
 849 {
 850         return a >= b;
 851 }
 852
 853 void o_ge(void)
 854 {
 855         if (!c_binop(c_ge, 4))
 856                 return;
 857         o_cmp(0x93, 0x9d);
 858 }
 859
 860 static long c_eq(long a, long b, unsigned bt)
 861 {
 862         return a == b;
 863 }
 864
 865 void o_eq(void)
 866 {
 867         if (!c_binop(c_eq, 4))
 868                 return;
 869         o_cmp(0x94, 0x94);
 870 }
 871
 872 static long c_neq(long a, long b, unsigned bt)
 873 {
 874         return a != b;
 875 }
 876
 877 void o_neq(void)
 878 {
 879         if (!c_binop(c_neq, 4))
 880                 return;
 881         o_cmp(0x95, 0x95);
 882 }
 883
 884 static long c_lnot(long a, unsigned bt)
 885 {
 886         return !a;
 887 }
 888
 889 void o_lnot(void)
 890 {
 891         if (!c_op(c_lnot, 4))
 892                 return;
 893         if (cmp_last == codeaddr()) {
 894                 buf[cmp_setl + 1] ^= 0x10;
 895         } else {
 896                 o_num(0, 4 | BT_SIGNED);
 897                 o_eq();
 898         }
 899 }
 900
 901 static long c_neg(long a, unsigned bt)
 902 {
 903         return -a;
 904 }
 905
 906 void o_neg(void)
 907 {
 908         struct tmp *t = TMP(0);
 909         int reg;
 910         unsigned bt = BT_TMPBT(t->bt);
 911         if (!c_op(c_neg, t->bt | BT_SIGNED))
 912                 return;
 913         reg = TMP_REG(t);
 914         tmp_to(t, reg, bt);
 915         regop1(NEG_REG, 3, reg, bt);
 916 }
 917
 918 static long c_not(long a, unsigned bt)
 919 {
 920         return ~a;
 921 }
 922
 923 void o_not(void)
 924 {
 925         struct tmp *t = TMP(0);
 926         int reg;
 927         unsigned bt = BT_TMPBT(t->bt);
 928         if (!c_op(c_not, 0))
 929                 return;
 930         reg = TMP_REG(t);
 931         tmp_to(t, reg, bt);
 932         regop1(NOT_REG, 2, reg, bt);
 933 }
 934
 935 void o_func_end(void)
 936 {
 937         int i;
 938         for (i = 0; i < nret; i++)
 939                 o_filljmp(ret[i]);
 940         os("\xc9\xc3", 2);              /* leave; ret; */
 941         putint(buf + spsub_addr, (maxsp + 7) & ~0x07, 4);
 942         out_func_end(buf, cur - buf);
 943 }
 944
 945 long o_mklocal(int size)
 946 {
 947         return sp_push((size + 7) & ~0x07);
 948 }
 949
 950 void o_rmlocal(long addr, int sz)
 951 {
 952         sp = addr - sz;
 953 }
 954
 955 static int arg_regs[] = {R_RDI, R_RSI, R_RDX, R_RCX, R_R8, R_R9};
 956
 957 #define R_NARGS                 ARRAY_SIZE(arg_regs)
 958
 959 long o_arg(int i, unsigned bt)
 960 {
 961         long addr;
 962         if (i < R_NARGS) {
 963                 addr = o_mklocal(BT_SZ(bt));
 964                 memop1(MOV_R2X, arg_regs[i], R_RBP, -addr, bt);
 965         } else {
 966                 addr = -8 * (i - R_NARGS + 2);
 967         }
 968         return addr;
 969 }
 970
 971 void o_assign(unsigned bt)
 972 {
 973         struct tmp *t1 = TMP(0);
 974         struct tmp *t2 = TMP(1);
 975         int r1 = BT_SZ(bt) > 1 ? TMP_REG(t1) : TMP_BYTEREG(t1);
 976         int reg;
 977         int off;
 978         tmp_to(t1, r1, BT_TMPBT(bt));
 979         if (t2->flags & LOC_LOCAL) {
 980                 reg = R_RBP;
 981                 off = t2->addr;
 982         } else {
 983                 reg = TMP_REG2(t2, r1);
 984                 off = 0;
 985                 tmp_mv(t2, reg);
 986         }
 987         tmp_drop(2);
 988         memop1(MOV_R2X, r1, reg, off, bt);
 989         tmp_push(r1, bt);
 990 }
 991
 992 void o_memcpy(int sz)
 993 {
 994         struct tmp *t0 = TMP(-1);
 995         struct tmp *t1 = TMP(0);
 996         struct tmp *t2 = TMP(1);
 997         o_num(sz, 4);
 998         tmp_to(t0, R_RCX, 0);
 999         tmp_mv(t1, R_RSI);
1000         tmp_mv(t2, R_RDI);
1001         os("\xf3\xa4", 2);              /* rep movs */
1002         tmp_drop(2);
1003 }
1004
1005 void o_memset(int x, int sz)
1006 {
1007         struct tmp *t0 = TMP(-2);
1008         struct tmp *t1 = TMP(-1);
1009         struct tmp *t2 = TMP(0);
1010         o_num(sz, 4);
1011         o_num(x, 4);
1012         tmp_to(t0, R_RAX, 0);
1013         tmp_to(t1, R_RCX, 0);
1014         tmp_mv(t2, R_RDI);
1015         os("\xf3\xaa", 2);              /* rep stosb */
1016         tmp_drop(2);
1017 }
1018
1019 long o_mklabel(void)
1020 {
1021         return codeaddr();
1022 }
1023
1024 static long jx(int x, long addr)
1025 {
1026         char op[2] = {0x0f};
1027         op[1] = x;
1028         os(op, 2);              /* jx $addr */
1029         oi(addr - codeaddr() - 4, 4);
1030         return codeaddr() - 4;
1031 }
1032
1033 static long jxtest(int x, long addr)
1034 {
1035         int bt = tmp_pop(R_RAX, 0);
1036         regop1(TEST_R2R, R_RAX, R_RAX, bt);
1037         return jx(x, addr);
1038 }
1039
1040 static long jxcmp(long addr, int inv)
1041 {
1042         int x;
1043         if (codeaddr() != cmp_last)
1044                 return -1;
1045         tmp_drop(1);
1046         cur = buf + cmp_setl;
1047         x = (unsigned char) buf[cmp_setl + 1];
1048         if (!(x & 0x10))
1049                 inv = !inv;
1050         return jx((inv ? x : x ^ 0x01) & ~0x10, addr);
1051 }
1052
1053 long o_jz(long addr)
1054 {
1055         long ret = jxcmp(addr, 0);
1056         return ret != -1 ? ret : jxtest(0x84, addr);
1057 }
1058
1059 long o_jnz(long addr)
1060 {
1061         long ret = jxcmp(addr, 1);
1062         return ret != -1 ? ret : jxtest(0x85, addr);
1063 }
1064
1065 long o_jmp(long addr)
1066 {
1067         os("\xe9", 1);                  /* jmp $addr */
1068         oi(addr - codeaddr() - 4, 4);
1069         return codeaddr() - 4;
1070 }
1071
1072 void o_filljmp2(long addr, long jmpdst)
1073 {
1074         putint(buf + addr, jmpdst - addr - 4, 4);
1075 }
1076
1077 void o_filljmp(long addr)
1078 {
1079         o_filljmp2(addr, codeaddr());
1080 }
1081
1082 void o_call(int argc, unsigned *bt, unsigned ret_bt)
1083 {
1084         int i;
1085         struct tmp *t;
1086         for (i = 0; i < ARRAY_SIZE(tmpregs); i++)
1087                 if (regs[tmpregs[i]] && regs[tmpregs[i]] - tmps < ntmp - argc)
1088                         tmp_mem(regs[tmpregs[i]]);
1089         if (argc > R_NARGS) {
1090                 long addr = sp_push(8 * (argc - R_NARGS));
1091                 for (i = argc - 1; i >= R_NARGS; --i) {
1092                         int reg = TMP_REG(TMP(0));
1093                         tmp_pop(reg, bt[i]);
1094                         memop1(MOV_R2X, reg, R_RBP,
1095                                 -(addr - (i - R_NARGS) * 8), BT_TMPBT(bt[i]));
1096                 }
1097         }
1098         for (i = MIN(argc, R_NARGS) - 1; i >= 0; i--)
1099                 tmp_pop(arg_regs[i], bt[i]);
1100         t = TMP(0);
1101         if (t->flags & LOC_SYM) {
1102                 os("\x31\xc0", 2);      /* xor %eax, %eax */
1103                 os("\xe8", 1);          /* call $x */
1104                 if (!nogen)
1105                         out_rela(t->addr, codeaddr(), 1);
1106                 oi(-4 + t->off, 4);
1107                 tmp_drop(1);
1108         } else {
1109                 tmp_mv(TMP(0), R_RAX);
1110                 tmp_drop(1);
1111                 regop1(CALL_REG, 2, R_RAX, 4);
1112         }
1113         if (ret_bt)
1114                 tmp_push(R_RAX, ret_bt);
1115 }
1116
1117 int o_nogen(void)
1118 {
1119         return nogen++;
1120 }
1121
1122 void o_dogen(void)
1123 {
1124         nogen = 0;
1125 }
1126
1127 void o_datset(long addr, int off, unsigned bt)
1128 {
1129         struct tmp *t = TMP(0);
1130         if (t->flags & LOC_NUM && !(t->flags & TMP_ADDR)) {
1131                 num_cast(t, bt);
1132                 out_datcpy(addr, off, (void *) &t->addr, BT_SZ(bt));
1133         }
1134         if (t->flags & LOC_SYM && !(t->flags & TMP_ADDR)) {
1135                 out_datrela(t->addr, addr, off);
1136                 out_datcpy(addr, off, (void *) &t->off, BT_SZ(bt));
1137         }
1138         tmp_drop(1);
1139 }