all.h

   1 #include <assert.h>
   2 #include <inttypes.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #define MAKESURE(what, x) typedef char make_sure_##what[(x)?1:-1]
   9 #define die(...) die_(__FILE__, __VA_ARGS__)
  10
  11 typedef unsigned char uchar;
  12 typedef unsigned int uint;
  13 typedef unsigned long ulong;
  14 typedef unsigned long long bits;
  15
  16 typedef struct BSet BSet;
  17 typedef struct Ref Ref;
  18 typedef struct Op Op;
  19 typedef struct Ins Ins;
  20 typedef struct Phi Phi;
  21 typedef struct Blk Blk;
  22 typedef struct Use Use;
  23 typedef struct Alias Alias;
  24 typedef struct Tmp Tmp;
  25 typedef struct Con Con;
  26 typedef struct Addr Mem;
  27 typedef struct Fn Fn;
  28 typedef struct Typ Typ;
  29 typedef struct Field Field;
  30 typedef struct Dat Dat;
  31 typedef struct Lnk Lnk;
  32 typedef struct Target Target;
  33
  34 enum {
  35         NString = 72,
  36         NIns    = 1 << 20,
  37         NAlign  = 3,
  38         NField  = 32,
  39         NBit    = CHAR_BIT * sizeof(bits),
  40 };
  41
  42 struct Target {
  43         char name[16];
  44         int gpr0;   /* first general purpose reg */
  45         int ngpr;
  46         int fpr0;   /* first floating point reg */
  47         int nfpr;
  48         bits rglob; /* globally live regs (e.g., sp, fp) */
  49         int nrglob;
  50         int *rsave; /* caller-save */
  51         int nrsave[2];
  52         bits (*retregs)(Ref, int[2]);
  53         bits (*argregs)(Ref, int[2]);
  54         int (*memargs)(int);
  55         void (*abi0)(Fn *);
  56         void (*abi1)(Fn *);
  57         void (*isel)(Fn *);
  58         void (*emitfn)(Fn *, FILE *);
  59         void (*emitfin)(FILE *);
  60         char asloc[4];
  61         char assym[4];
  62 };
  63
  64 #define BIT(n) ((bits)1 << (n))
  65
  66 enum {
  67         RXX = 0,
  68         Tmp0 = NBit, /* first non-reg temporary */
  69 };
  70
  71 struct BSet {
  72         uint nt;
  73         bits *t;
  74 };
  75
  76 struct Ref {
  77         uint type:3;
  78         uint val:29;
  79 };
  80
  81 enum {
  82         RTmp,
  83         RCon,
  84         RType,
  85         RSlot,
  86         RCall,
  87         RMem,
  88 };
  89
  90 #define R        (Ref){0, 0}
  91 #define TMP(x)   (Ref){RTmp, x}
  92 #define CON(x)   (Ref){RCon, x}
  93 #define CON_Z    CON(0)          /* reserved zero constant */
  94 #define SLOT(x)  (Ref){RSlot, (x)&0x1fffffff}
  95 #define TYPE(x)  (Ref){RType, x}
  96 #define CALL(x)  (Ref){RCall, x}
  97 #define MEM(x)   (Ref){RMem, x}
  98
  99 static inline int req(Ref a, Ref b)
 100 {
 101         return a.type == b.type && a.val == b.val;
 102 }
 103
 104 static inline int rtype(Ref r)
 105 {
 106         if (req(r, R))
 107                 return -1;
 108         return r.type;
 109 }
 110
 111 enum CmpI {
 112         Cieq,
 113         Cine,
 114         Cisge,
 115         Cisgt,
 116         Cisle,
 117         Cislt,
 118         Ciuge,
 119         Ciugt,
 120         Ciule,
 121         Ciult,
 122         NCmpI,
 123 };
 124
 125 enum CmpF {
 126         Cfeq,
 127         Cfge,
 128         Cfgt,
 129         Cfle,
 130         Cflt,
 131         Cfne,
 132         Cfo,
 133         Cfuo,
 134         NCmpF,
 135         NCmp = NCmpI + NCmpF,
 136 };
 137
 138 enum O {
 139         Oxxx,
 140 #define O(op, x, y) O##op,
 141         #include "ops.h"
 142         NOp,
 143 };
 144
 145 enum J {
 146         Jxxx,
 147 #define JMPS(X)                                 \
 148         X(retw)   X(retl)   X(rets)   X(retd)   \
 149         X(retsb)  X(retub)  X(retsh)  X(retuh)  \
 150         X(retc)   X(ret0)   X(jmp)    X(jnz)    \
 151         X(jfieq)  X(jfine)  X(jfisge) X(jfisgt) \
 152         X(jfisle) X(jfislt) X(jfiuge) X(jfiugt) \
 153         X(jfiule) X(jfiult) X(jffeq)  X(jffge)  \
 154         X(jffgt)  X(jffle)  X(jfflt)  X(jffne)  \
 155         X(jffo)   X(jffuo)
 156 #define X(j) J##j,
 157         JMPS(X)
 158 #undef X
 159         NJmp
 160 };
 161
 162 enum {
 163         Ocmpw = Oceqw,
 164         Ocmpw1 = Ocultw,
 165         Ocmpl = Oceql,
 166         Ocmpl1 = Ocultl,
 167         Ocmps = Oceqs,
 168         Ocmps1 = Ocuos,
 169         Ocmpd = Oceqd,
 170         Ocmpd1 = Ocuod,
 171         Oalloc = Oalloc4,
 172         Oalloc1 = Oalloc16,
 173         Oflag = Oflagieq,
 174         Oflag1 = Oflagfuo,
 175         NPubOp = Onop,
 176         Jjf = Jjfieq,
 177         Jjf1 = Jjffuo,
 178 };
 179
 180 #define INRANGE(x, l, u) ((unsigned)(x) - l <= u - l) /* linear in x */
 181 #define isstore(o) INRANGE(o, Ostoreb, Ostored)
 182 #define isload(o) INRANGE(o, Oloadsb, Oload)
 183 #define isext(o) INRANGE(o, Oextsb, Oextuw)
 184 #define ispar(o) INRANGE(o, Opar, Opare)
 185 #define isarg(o) INRANGE(o, Oarg, Oargv)
 186 #define isret(j) INRANGE(j, Jretw, Jret0)
 187 #define isparbh(o) INRANGE(o, Oparsb, Oparuh)
 188 #define isargbh(o) INRANGE(o, Oargsb, Oarguh)
 189 #define isretbh(j) INRANGE(j, Jretsb, Jretuh)
 190
 191 enum {
 192         Kx = -1, /* "top" class (see usecheck() and clsmerge()) */
 193         Kw,
 194         Kl,
 195         Ks,
 196         Kd
 197 };
 198
 199 #define KWIDE(k) ((k)&1)
 200 #define KBASE(k) ((k)>>1)
 201
 202 struct Op {
 203         char *name;
 204         short argcls[2][4];
 205         int canfold;
 206 };
 207
 208 struct Ins {
 209         uint op:30;
 210         uint cls:2;
 211         Ref to;
 212         Ref arg[2];
 213 };
 214
 215 struct Phi {
 216         Ref to;
 217         Ref *arg;
 218         Blk **blk;
 219         uint narg;
 220         int cls;
 221         Phi *link;
 222 };
 223
 224 struct Blk {
 225         Phi *phi;
 226         Ins *ins;
 227         uint nins;
 228         struct {
 229                 short type;
 230                 Ref arg;
 231         } jmp;
 232         Blk *s1;
 233         Blk *s2;
 234         Blk *link;
 235
 236         uint id;
 237         uint visit;
 238
 239         Blk *idom;
 240         Blk *dom, *dlink;
 241         Blk **fron;
 242         uint nfron;
 243
 244         Blk **pred;
 245         uint npred;
 246         BSet in[1], out[1], gen[1];
 247         int nlive[2];
 248         int loop;
 249         char name[NString];
 250 };
 251
 252 struct Use {
 253         enum {
 254                 UXXX,
 255                 UPhi,
 256                 UIns,
 257                 UJmp,
 258         } type;
 259         uint bid;
 260         union {
 261                 Ins *ins;
 262                 Phi *phi;
 263         } u;
 264 };
 265
 266 enum {
 267         NoAlias,
 268         MayAlias,
 269         MustAlias
 270 };
 271
 272 struct Alias {
 273         enum {
 274                 ABot = 0,
 275                 ALoc = 1, /* stack local */
 276                 ACon = 2,
 277                 AEsc = 3, /* stack escaping */
 278                 ASym = 4,
 279                 AUnk = 6,
 280         #define astack(t) ((t) & 1)
 281         } type;
 282         Ref base;
 283         uint32_t label;
 284         int64_t offset;
 285         Alias *slot;
 286 };
 287
 288 struct Tmp {
 289         char name[NString];
 290         Use *use;
 291         uint ndef, nuse;
 292         uint bid; /* id of a defining block */
 293         uint cost;
 294         int slot; /* -1 for unset */
 295         short cls;
 296         struct {
 297                 int r;  /* register or -1 */
 298                 int w;  /* weight */
 299                 bits m; /* avoid these registers */
 300         } hint;
 301         int phi;
 302         Alias alias;
 303         enum {
 304                 WFull,
 305                 Wsb, /* must match Oload/Oext order */
 306                 Wub,
 307                 Wsh,
 308                 Wuh,
 309                 Wsw,
 310                 Wuw
 311         } width;
 312         int visit;
 313 };
 314
 315 struct Con {
 316         enum {
 317                 CUndef,
 318                 CBits,
 319                 CAddr,
 320         } type;
 321         uint32_t label;
 322         union {
 323                 int64_t i;
 324                 double d;
 325                 float s;
 326         } bits;
 327         char flt; /* 1 to print as s, 2 to print as d */
 328         char local;
 329 };
 330
 331 typedef struct Addr Addr;
 332
 333 struct Addr { /* amd64 addressing */
 334         Con offset;
 335         Ref base;
 336         Ref index;
 337         int scale;
 338 };
 339
 340 struct Lnk {
 341         char export;
 342         char align;
 343         char *sec;
 344         char *secf;
 345 };
 346
 347 struct Fn {
 348         Blk *start;
 349         Tmp *tmp;
 350         Con *con;
 351         Mem *mem;
 352         int ntmp;
 353         int ncon;
 354         int nmem;
 355         uint nblk;
 356         int retty; /* index in typ[], -1 if no aggregate return */
 357         Ref retr;
 358         Blk **rpo;
 359         bits reg;
 360         int slot;
 361         char vararg;
 362         char dynalloc;
 363         char name[NString];
 364         Lnk lnk;
 365 };
 366
 367 struct Typ {
 368         char name[NString];
 369         char isdark;
 370         char isunion;
 371         int align;
 372         uint64_t size;
 373         uint nunion;
 374         struct Field {
 375                 enum {
 376                         FEnd,
 377                         Fb,
 378                         Fh,
 379                         Fw,
 380                         Fl,
 381                         Fs,
 382                         Fd,
 383                         FPad,
 384                         FTyp,
 385                 } type;
 386                 uint len; /* or index in typ[] for FTyp */
 387         } (*fields)[NField+1];
 388 };
 389
 390 struct Dat {
 391         enum {
 392                 DStart,
 393                 DEnd,
 394                 DB,
 395                 DH,
 396                 DW,
 397                 DL,
 398                 DZ
 399         } type;
 400         char *name;
 401         Lnk *lnk;
 402         union {
 403                 int64_t num;
 404                 double fltd;
 405                 float flts;
 406                 char *str;
 407                 struct {
 408                         char *name;
 409                         int64_t off;
 410                 } ref;
 411         } u;
 412         char isref;
 413         char isstr;
 414 };
 415
 416 /* main.c */
 417 extern Target T;
 418 extern char debug['Z'+1];
 419
 420 /* util.c */
 421 typedef enum {
 422         PHeap, /* free() necessary */
 423         PFn, /* discarded after processing the function */
 424 } Pool;
 425
 426 extern Typ *typ;
 427 extern Ins insb[NIns], *curi;
 428 uint32_t hash(char *);
 429 void die_(char *, char *, ...) __attribute__((noreturn));
 430 void *emalloc(size_t);
 431 void *alloc(size_t);
 432 void freeall(void);
 433 void *vnew(ulong, size_t, Pool);
 434 void vfree(void *);
 435 void vgrow(void *, ulong);
 436 uint32_t intern(char *);
 437 char *str(uint32_t);
 438 int argcls(Ins *, int);
 439 int isreg(Ref);
 440 int iscmp(int, int *, int *);
 441 void emit(int, int, Ref, Ref, Ref);
 442 void emiti(Ins);
 443 void idup(Ins **, Ins *, ulong);
 444 Ins *icpy(Ins *, Ins *, ulong);
 445 int cmpop(int);
 446 int cmpneg(int);
 447 int clsmerge(short *, short);
 448 int phicls(int, Tmp *);
 449 Ref newtmp(char *, int, Fn *);
 450 void chuse(Ref, int, Fn *);
 451 Ref newcon(Con *, Fn *);
 452 Ref getcon(int64_t, Fn *);
 453 int addcon(Con *, Con *);
 454 void blit(Ref, uint, Ref, uint, uint, Fn *);
 455 void blit0(Ref, Ref, uint, Fn *);
 456 void salloc(Ref, Ref, Fn *);
 457 void dumpts(BSet *, Tmp *, FILE *);
 458
 459 void bsinit(BSet *, uint);
 460 void bszero(BSet *);
 461 uint bscount(BSet *);
 462 void bsset(BSet *, uint);
 463 void bsclr(BSet *, uint);
 464 void bscopy(BSet *, BSet *);
 465 void bsunion(BSet *, BSet *);
 466 void bsinter(BSet *, BSet *);
 467 void bsdiff(BSet *, BSet *);
 468 int bsequal(BSet *, BSet *);
 469 int bsiter(BSet *, int *);
 470
 471 static inline int
 472 bshas(BSet *bs, uint elt)
 473 {
 474         assert(elt < bs->nt * NBit);
 475         return (bs->t[elt/NBit] & BIT(elt%NBit)) != 0;
 476 }
 477
 478 /* parse.c */
 479 extern Op optab[NOp];
 480 void parse(FILE *, char *, void (Dat *), void (Fn *));
 481 void printfn(Fn *, FILE *);
 482 void printref(Ref, Fn *, FILE *);
 483 void err(char *, ...) __attribute__((noreturn));
 484
 485 /* abi.c */
 486 void elimsb(Fn *);
 487
 488 /* cfg.c */
 489 Blk *blknew(void);
 490 void edgedel(Blk *, Blk **);
 491 void fillpreds(Fn *);
 492 void fillrpo(Fn *);
 493 void filldom(Fn *);
 494 int sdom(Blk *, Blk *);
 495 int dom(Blk *, Blk *);
 496 void fillfron(Fn *);
 497 void loopiter(Fn *, void (*)(Blk *, Blk *));
 498 void fillloop(Fn *);
 499 void simpljmp(Fn *);
 500
 501 /* mem.c */
 502 void memopt(Fn *);
 503
 504 /* alias.c */
 505 void fillalias(Fn *);
 506 int alias(Ref, int, Ref, int, int *, Fn *);
 507 int escapes(Ref, Fn *);
 508
 509 /* load.c */
 510 int loadsz(Ins *);
 511 int storesz(Ins *);
 512 void loadopt(Fn *);
 513
 514 /* ssa.c */
 515 void filluse(Fn *);
 516 void fillpreds(Fn *);
 517 void fillrpo(Fn *);
 518 void ssa(Fn *);
 519 void ssacheck(Fn *);
 520
 521 /* copy.c */
 522 void copy(Fn *);
 523
 524 /* fold.c */
 525 void fold(Fn *);
 526
 527 /* live.c */
 528 void liveon(BSet *, Blk *, Blk *);
 529 void filllive(Fn *);
 530
 531 /* spill.c */
 532 void fillcost(Fn *);
 533 void spill(Fn *);
 534
 535 /* rega.c */
 536 void rega(Fn *);
 537
 538 /* emit.c */
 539 void emitlnk(char *, Lnk *, char *, FILE *);
 540 void emitdat(Dat *, FILE *);
 541 int stashbits(void *, int);
 542 void elf_emitfnfin(char *, FILE *);
 543 void elf_emitfin(FILE *);
 544 void macho_emitfin(FILE *);