9563738134

Committed 18 Jun 2024 10:46AM UTC coverage: 92.594% (+0.01%) from 92.58%

Build # 9563738134

Build Type

push

github

Committed by

ligurio

Commit Message

Prevent loop in snap_usedef().

Reported by XmiliaH.

(cherry picked from commit 0e66fc963)

It is possible to get an infinite loop in a function `snap_usedef`
when a `UCLO` makes a tight loop.

Sergey Bronnikov:
* added the description and the test for the problem

Part of tarantool/tarantool#9595

Run Details

5657 of 6018 branches covered (94.0%)

Branch coverage included in aggregate %.

21598 of 23417 relevant lines covered (92.23%)

2937882.77 hits per line

Source File
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93.09

/src/lj_ir.c

/*
** SSA IR (Intermediate Representation) emitter.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
*/

#define lj_ir_c
#define LUA_CORE

/* For pointers to libc/libm functions. */
#include <stdio.h>
#include <math.h>

#include "lj_obj.h"

#if LJ_HASJIT

#include "lj_gc.h"
#include "lj_buf.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_ir.h"
#include "lj_jit.h"
#include "lj_ircall.h"
#include "lj_iropt.h"
#include "lj_trace.h"
#if LJ_HASFFI
#include "lj_ctype.h"
#include "lj_cdata.h"
#include "lj_carith.h"
#endif
#include "lj_vm.h"
#include "lj_strscan.h"
#include "lj_strfmt.h"
#include "lj_lib.h"

/* Some local macros to save typing. Undef'd at the end. */
#define IR(ref)                        (&J->cur.ir[(ref)])
#define fins                        (&J->fold.ins)

/* Pass IR on to next optimization in chain (FOLD). */
#define emitir(ot, a, b)        (lj_ir_set(J, (ot), (a), (b)), lj_opt_fold(J))

/* -- IR tables ----------------------------------------------------------- */

/* IR instruction modes. */
LJ_DATADEF const uint8_t lj_ir_mode[IR__MAX+1] = {
IRDEF(IRMODE)
  0
};

/* IR type sizes. */
LJ_DATADEF const uint8_t lj_ir_type_size[IRT__MAX+1] = {
#define IRTSIZE(name, size)        size,
IRTDEF(IRTSIZE)
#undef IRTSIZE
  0
};

/* C call info for CALL* instructions. */
LJ_DATADEF const CCallInfo lj_ir_callinfo[] = {
#define IRCALLCI(cond, name, nargs, kind, type, flags) \
  { (ASMFunction)IRCALLCOND_##cond(name), \
    (nargs)|(CCI_CALL_##kind)|(IRT_##type<<CCI_OTSHIFT)|(flags) },
IRCALLDEF(IRCALLCI)
#undef IRCALLCI
  { NULL, 0 }
};

/* -- IR emitter ---------------------------------------------------------- */

/* Grow IR buffer at the top. */
void LJ_FASTCALL lj_ir_growtop(jit_State *J)
{
  IRIns *baseir = J->irbuf + J->irbotlim;
  MSize szins = J->irtoplim - J->irbotlim;
  if (szins) {
    baseir = (IRIns *)lj_mem_realloc(J->L, baseir, szins*sizeof(IRIns),
                                     2*szins*sizeof(IRIns));
    J->irtoplim = J->irbotlim + 2*szins;
  } else {
    baseir = (IRIns *)lj_mem_realloc(J->L, NULL, 0, LJ_MIN_IRSZ*sizeof(IRIns));
    J->irbotlim = REF_BASE - LJ_MIN_IRSZ/4;
    J->irtoplim = J->irbotlim + LJ_MIN_IRSZ;
  }
  J->cur.ir = J->irbuf = baseir - J->irbotlim;
}

/* Grow IR buffer at the bottom or shift it up. */
static void lj_ir_growbot(jit_State *J)
{
  IRIns *baseir = J->irbuf + J->irbotlim;
  MSize szins = J->irtoplim - J->irbotlim;
  lj_assertJ(szins != 0, "zero IR size");
  lj_assertJ(J->cur.nk == J->irbotlim || J->cur.nk-1 == J->irbotlim,
             "unexpected IR growth");
  if (J->cur.nins + (szins >> 1) < J->irtoplim) {
    /* More than half of the buffer is free on top: shift up by a quarter. */
    MSize ofs = szins >> 2;
    memmove(baseir + ofs, baseir, (J->cur.nins - J->irbotlim)*sizeof(IRIns));
    J->irbotlim -= ofs;
    J->irtoplim -= ofs;
    J->cur.ir = J->irbuf = baseir - J->irbotlim;
  } else {
    /* Double the buffer size, but split the growth amongst top/bottom. */
    IRIns *newbase = lj_mem_newt(J->L, 2*szins*sizeof(IRIns), IRIns);
    MSize ofs = szins >= 256 ? 128 : (szins >> 1);  /* Limit bottom growth. */
    memcpy(newbase + ofs, baseir, (J->cur.nins - J->irbotlim)*sizeof(IRIns));
    lj_mem_free(G(J->L), baseir, szins*sizeof(IRIns));
    J->irbotlim -= ofs;
    J->irtoplim = J->irbotlim + 2*szins;
    J->cur.ir = J->irbuf = newbase - J->irbotlim;
  }
}

/* Emit IR without any optimizations. */
TRef LJ_FASTCALL lj_ir_emit(jit_State *J)
{
  IRRef ref = lj_ir_nextins(J);
  IRIns *ir = IR(ref);
  IROp op = fins->o;
  ir->prev = J->chain[op];
  J->chain[op] = (IRRef1)ref;
  ir->o = op;
  ir->op1 = fins->op1;
  ir->op2 = fins->op2;
  J->guardemit.irt |= fins->t.irt;
  return TREF(ref, irt_t((ir->t = fins->t)));
}

/* Emit call to a C function. */
TRef lj_ir_call(jit_State *J, IRCallID id, ...)
{
  const CCallInfo *ci = &lj_ir_callinfo[id];
  uint32_t n = CCI_NARGS(ci);
  TRef tr = TREF_NIL;
  va_list argp;
  va_start(argp, id);
  if ((ci->flags & CCI_L)) n--;
  if (n > 0)
    tr = va_arg(argp, IRRef);
  while (n-- > 1)
    tr = emitir(IRT(IR_CARG, IRT_NIL), tr, va_arg(argp, IRRef));
  va_end(argp);
  if (CCI_OP(ci) == IR_CALLS)
    J->needsnap = 1;  /* Need snapshot after call with side effect. */
  return emitir(CCI_OPTYPE(ci), tr, id);
}

/* Load field of type t from GG_State + offset. Must be 32 bit aligned. */
LJ_FUNC TRef lj_ir_ggfload(jit_State *J, IRType t, uintptr_t ofs)
{
  lj_assertJ((ofs & 3) == 0, "unaligned GG_State field offset");
  ofs >>= 2;
  lj_assertJ(ofs >= IRFL__MAX && ofs <= 0x3ff,
             "GG_State field offset breaks 10 bit FOLD key limit");
  lj_ir_set(J, IRT(IR_FLOAD, t), REF_NIL, ofs);
  return lj_opt_fold(J);
}

/* -- Interning of constants ---------------------------------------------- */

/*
** IR instructions for constants are kept between J->cur.nk >= ref < REF_BIAS.
** They are chained like all other instructions, but grow downwards.
** The are interned (like strings in the VM) to facilitate reference
** comparisons. The same constant must get the same reference.
*/

/* Get ref of next IR constant and optionally grow IR.
** Note: this may invalidate all IRIns *!
*/
static LJ_AINLINE IRRef ir_nextk(jit_State *J)
{
  IRRef ref = J->cur.nk;
  if (LJ_UNLIKELY(ref <= J->irbotlim)) lj_ir_growbot(J);
  J->cur.nk = --ref;
  return ref;
}

/* Get ref of next 64 bit IR constant and optionally grow IR.
** Note: this may invalidate all IRIns *!
*/
static LJ_AINLINE IRRef ir_nextk64(jit_State *J)
{
  IRRef ref = J->cur.nk - 2;
  lj_assertJ(J->state != LJ_TRACE_ASM, "bad JIT state");
  if (LJ_UNLIKELY(ref < J->irbotlim)) lj_ir_growbot(J);
  J->cur.nk = ref;
  return ref;
}

#if LJ_GC64
#define ir_nextkgc ir_nextk64
#else
#define ir_nextkgc ir_nextk
#endif

/* Intern int32_t constant. */
TRef LJ_FASTCALL lj_ir_kint(jit_State *J, int32_t k)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef ref;
  for (ref = J->chain[IR_KINT]; ref; ref = cir[ref].prev)
    if (cir[ref].i == k)
      goto found;
  ref = ir_nextk(J);
  ir = IR(ref);
  ir->i = k;
  ir->t.irt = IRT_INT;
  ir->o = IR_KINT;
  ir->prev = J->chain[IR_KINT];
  J->chain[IR_KINT] = (IRRef1)ref;
found:
  return TREF(ref, IRT_INT);
}

/* Intern 64 bit constant, given by its 64 bit pattern. */
TRef lj_ir_k64(jit_State *J, IROp op, uint64_t u64)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef ref;
  IRType t = op == IR_KNUM ? IRT_NUM : IRT_I64;
  for (ref = J->chain[op]; ref; ref = cir[ref].prev)
    if (ir_k64(&cir[ref])->u64 == u64)
      goto found;
  ref = ir_nextk64(J);
  ir = IR(ref);
  ir[1].tv.u64 = u64;
  ir->t.irt = t;
  ir->o = op;
  ir->op12 = 0;
  ir->prev = J->chain[op];
  J->chain[op] = (IRRef1)ref;
found:
  return TREF(ref, t);
}

/* Intern FP constant, given by its 64 bit pattern. */
TRef lj_ir_knum_u64(jit_State *J, uint64_t u64)
{
  return lj_ir_k64(J, IR_KNUM, u64);
}

/* Intern 64 bit integer constant. */
TRef lj_ir_kint64(jit_State *J, uint64_t u64)
{
  return lj_ir_k64(J, IR_KINT64, u64);
}

/* Check whether a number is int and return it. -0 is NOT considered an int. */
static int numistrueint(lua_Number n, int32_t *kp)
{
  int32_t k = lj_num2int(n);
  if (n == (lua_Number)k) {
    if (kp) *kp = k;
    if (k == 0) {  /* Special check for -0. */
      TValue tv;
      setnumV(&tv, n);
      if (tv.u32.hi != 0)
        return 0;
    }
    return 1;
  }
  return 0;
}

/* Intern number as int32_t constant if possible, otherwise as FP constant. */
TRef lj_ir_knumint(jit_State *J, lua_Number n)
{
  int32_t k;
  if (numistrueint(n, &k))
    return lj_ir_kint(J, k);
  else
    return lj_ir_knum(J, n);
}

/* Intern GC object "constant". */
TRef lj_ir_kgc(jit_State *J, GCobj *o, IRType t)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef ref;
  lj_assertJ(!isdead(J2G(J), o), "interning of dead GC object");
  for (ref = J->chain[IR_KGC]; ref; ref = cir[ref].prev)
    if (ir_kgc(&cir[ref]) == o)
      goto found;
  ref = ir_nextkgc(J);
  ir = IR(ref);
  /* NOBARRIER: Current trace is a GC root. */
  ir->op12 = 0;
  setgcref(ir[LJ_GC64].gcr, o);
  ir->t.irt = (uint8_t)t;
  ir->o = IR_KGC;
  ir->prev = J->chain[IR_KGC];
  J->chain[IR_KGC] = (IRRef1)ref;
found:
  return TREF(ref, t);
}

/* Allocate GCtrace constant placeholder (no interning). */
TRef lj_ir_ktrace(jit_State *J)
{
  IRRef ref = ir_nextkgc(J);
  IRIns *ir = IR(ref);
  lj_assertJ(irt_toitype_(IRT_P64) == LJ_TTRACE, "mismatched type mapping");
  ir->t.irt = IRT_P64;
  ir->o = LJ_GC64 ? IR_KNUM : IR_KNULL;  /* Not IR_KGC yet, but same size. */
  ir->op12 = 0;
  ir->prev = 0;
  return TREF(ref, IRT_P64);
}

/* Intern pointer constant. */
TRef lj_ir_kptr_(jit_State *J, IROp op, void *ptr)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef ref;
#if LJ_64 && !LJ_GC64
  lj_assertJ((void *)(uintptr_t)u32ptr(ptr) == ptr, "out-of-range GC pointer");
#endif
  for (ref = J->chain[op]; ref; ref = cir[ref].prev)
    if (ir_kptr(&cir[ref]) == ptr)
      goto found;
#if LJ_GC64
  ref = ir_nextk64(J);
#else
  ref = ir_nextk(J);
#endif
  ir = IR(ref);
  ir->op12 = 0;
  setmref(ir[LJ_GC64].ptr, ptr);
  ir->t.irt = IRT_PGC;
  ir->o = op;
  ir->prev = J->chain[op];
  J->chain[op] = (IRRef1)ref;
found:
  return TREF(ref, IRT_PGC);
}

/* Intern typed NULL constant. */
TRef lj_ir_knull(jit_State *J, IRType t)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef ref;
  for (ref = J->chain[IR_KNULL]; ref; ref = cir[ref].prev)
    if (irt_t(cir[ref].t) == t)
      goto found;
  ref = ir_nextk(J);
  ir = IR(ref);
  ir->i = 0;
  ir->t.irt = (uint8_t)t;
  ir->o = IR_KNULL;
  ir->prev = J->chain[IR_KNULL];
  J->chain[IR_KNULL] = (IRRef1)ref;
found:
  return TREF(ref, t);
}

/* Intern key slot. */
TRef lj_ir_kslot(jit_State *J, TRef key, IRRef slot)
{
  IRIns *ir, *cir = J->cur.ir;
  IRRef2 op12 = IRREF2((IRRef1)key, (IRRef1)slot);
  IRRef ref;
  /* Const part is not touched by CSE/DCE, so 0-65535 is ok for IRMlit here. */
  lj_assertJ(tref_isk(key) && slot == (IRRef)(IRRef1)slot,
             "out-of-range key/slot");
  for (ref = J->chain[IR_KSLOT]; ref; ref = cir[ref].prev)
    if (cir[ref].op12 == op12)
      goto found;
  ref = ir_nextk(J);
  ir = IR(ref);
  ir->op12 = op12;
  ir->t.irt = IRT_P32;
  ir->o = IR_KSLOT;
  ir->prev = J->chain[IR_KSLOT];
  J->chain[IR_KSLOT] = (IRRef1)ref;
found:
  return TREF(ref, IRT_P32);
}

/* -- Access to IR constants ---------------------------------------------- */

/* Copy value of IR constant. */
void lj_ir_kvalue(lua_State *L, TValue *tv, const IRIns *ir)
{
  UNUSED(L);
  lj_assertL(ir->o != IR_KSLOT, "unexpected KSLOT");  /* Common mistake. */
  switch (ir->o) {
  case IR_KPRI: setpriV(tv, irt_toitype(ir->t)); break;
  case IR_KINT: setintV(tv, ir->i); break;
  case IR_KGC: setgcV(L, tv, ir_kgc(ir), irt_toitype(ir->t)); break;
  case IR_KPTR: case IR_KKPTR:
    setnumV(tv, (lua_Number)(uintptr_t)ir_kptr(ir));
    break;
  case IR_KNULL: setintV(tv, 0); break;
  case IR_KNUM: setnumV(tv, ir_knum(ir)->n); break;
#if LJ_HASFFI
  case IR_KINT64: {
    GCcdata *cd = lj_cdata_new_(L, CTID_INT64, 8);
    *(uint64_t *)cdataptr(cd) = ir_kint64(ir)->u64;
    setcdataV(L, tv, cd);
    break;
    }
#endif
  default: lj_assertL(0, "bad IR constant op %d", ir->o); break;
  }
}

/* -- Convert IR operand types -------------------------------------------- */

/* Convert from string to number. */
TRef LJ_FASTCALL lj_ir_tonumber(jit_State *J, TRef tr)
{
  if (!tref_isnumber(tr)) {
    if (tref_isstr(tr))
      tr = emitir(IRTG(IR_STRTO, IRT_NUM), tr, 0);
    else
      lj_trace_err(J, LJ_TRERR_BADTYPE);
  }
  return tr;
}

/* Convert from integer or string to number. */
TRef LJ_FASTCALL lj_ir_tonum(jit_State *J, TRef tr)
{
  if (!tref_isnum(tr)) {
    if (tref_isinteger(tr))
      tr = emitir(IRTN(IR_CONV), tr, IRCONV_NUM_INT);
    else if (tref_isstr(tr))
      tr = emitir(IRTG(IR_STRTO, IRT_NUM), tr, 0);
    else
      lj_trace_err(J, LJ_TRERR_BADTYPE);
  }
  return tr;
}

/* Convert from integer or number to string. */
TRef LJ_FASTCALL lj_ir_tostr(jit_State *J, TRef tr)
{
  if (!tref_isstr(tr)) {
    if (!tref_isnumber(tr))
      lj_trace_err(J, LJ_TRERR_BADTYPE);
    tr = emitir(IRT(IR_TOSTR, IRT_STR), tr,
                tref_isnum(tr) ? IRTOSTR_NUM : IRTOSTR_INT);
  }
  return tr;
}

/* -- Miscellaneous IR ops ------------------------------------------------ */

/* Evaluate numeric comparison. */
int lj_ir_numcmp(lua_Number a, lua_Number b, IROp op)
{
  switch (op) {
  case IR_EQ: return (a == b);
  case IR_NE: return (a != b);
  case IR_LT: return (a < b);
  case IR_GE: return (a >= b);
  case IR_LE: return (a <= b);
  case IR_GT: return (a > b);
  case IR_ULT: return !(a >= b);
  case IR_UGE: return !(a < b);
  case IR_ULE: return !(a > b);
  case IR_UGT: return !(a <= b);
  default: lj_assertX(0, "bad IR op %d", op); return 0;
  }
}

/* Evaluate string comparison. */
int lj_ir_strcmp(GCstr *a, GCstr *b, IROp op)
{
  int res = lj_str_cmp(a, b);
  switch (op) {
  case IR_LT: return (res < 0);
  case IR_GE: return (res >= 0);
  case IR_LE: return (res <= 0);
  case IR_GT: return (res > 0);
  default: lj_assertX(0, "bad IR op %d", op); return 0;
  }
}

/* Rollback IR to previous state. */
void lj_ir_rollback(jit_State *J, IRRef ref)
{
  IRRef nins = J->cur.nins;
  while (nins > ref) {
    IRIns *ir;
    nins--;
    ir = IR(nins);
    J->chain[ir->o] = ir->prev;
  }
  J->cur.nins = nins;
}

#undef IR
#undef fins
#undef emitir

#endif

1	/*
2	** SSA IR (Intermediate Representation) emitter.
3	** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
4	*/
5
6	#define lj_ir_c
7	#define LUA_CORE
8
9	/* For pointers to libc/libm functions. */
10	#include <stdio.h>
11	#include <math.h>
12
13	#include "lj_obj.h"
14
15	#if LJ_HASJIT
16
17	#include "lj_gc.h"
18	#include "lj_buf.h"
19	#include "lj_str.h"
20	#include "lj_tab.h"
21	#include "lj_ir.h"
22	#include "lj_jit.h"
23	#include "lj_ircall.h"
24	#include "lj_iropt.h"
25	#include "lj_trace.h"
26	#if LJ_HASFFI
27	#include "lj_ctype.h"
28	#include "lj_cdata.h"
29	#include "lj_carith.h"
30	#endif
31	#include "lj_vm.h"
32	#include "lj_strscan.h"
33	#include "lj_strfmt.h"
34	#include "lj_lib.h"
35
36	/* Some local macros to save typing. Undef'd at the end. */
37	#define IR(ref) (&J->cur.ir[(ref)])
38	#define fins (&J->fold.ins)
39
40	/* Pass IR on to next optimization in chain (FOLD). */
41	#define emitir(ot, a, b) (lj_ir_set(J, (ot), (a), (b)), lj_opt_fold(J))
42
43	/* -- IR tables ----------------------------------------------------------- */
44
45	/* IR instruction modes. */
46	LJ_DATADEF const uint8_t lj_ir_mode[IR__MAX+1] = {
47	IRDEF(IRMODE)
48	0
49	};
50
51	/* IR type sizes. */
52	LJ_DATADEF const uint8_t lj_ir_type_size[IRT__MAX+1] = {
53	#define IRTSIZE(name, size) size,
54	IRTDEF(IRTSIZE)
55	#undef IRTSIZE
56	0
57	};
58
59	/* C call info for CALL* instructions. */
60	LJ_DATADEF const CCallInfo lj_ir_callinfo[] = {
61	#define IRCALLCI(cond, name, nargs, kind, type, flags) \
62	{ (ASMFunction)IRCALLCOND_##cond(name), \
63	(nargs)\|(CCI_CALL_##kind)\|(IRT_##type<<CCI_OTSHIFT)\|(flags) },
64	IRCALLDEF(IRCALLCI)
65	#undef IRCALLCI
66	{ NULL, 0 }
67	};
68
69	/* -- IR emitter ---------------------------------------------------------- */
70
71	/* Grow IR buffer at the top. */
72	void LJ_FASTCALL lj_ir_growtop(jit_State *J)	198✔
73	{
74	IRIns *baseir = J->irbuf + J->irbotlim;	198✔
75	MSize szins = J->irtoplim - J->irbotlim;	198✔
76	if (szins) {	198✔
77	baseir = (IRIns )lj_mem_realloc(J->L, baseir, szinssizeof(IRIns),	154✔
78	2szinssizeof(IRIns));	77✔
79	J->irtoplim = J->irbotlim + 2*szins;	77✔
80	} else {
81	baseir = (IRIns )lj_mem_realloc(J->L, NULL, 0, LJ_MIN_IRSZsizeof(IRIns));	121✔
82	J->irbotlim = REF_BASE - LJ_MIN_IRSZ/4;	121✔
83	J->irtoplim = J->irbotlim + LJ_MIN_IRSZ;	121✔
84	}
85	J->cur.ir = J->irbuf = baseir - J->irbotlim;	198✔
86	}	198✔
87
88	/* Grow IR buffer at the bottom or shift it up. */
89	static void lj_ir_growbot(jit_State *J)	293✔
90	{
91	IRIns *baseir = J->irbuf + J->irbotlim;	293✔
92	MSize szins = J->irtoplim - J->irbotlim;	293✔
93	lj_assertJ(szins != 0, "zero IR size");	293✔
94	lj_assertJ(J->cur.nk == J->irbotlim \|\| J->cur.nk-1 == J->irbotlim,	293✔
95	"unexpected IR growth");
96	if (J->cur.nins + (szins >> 1) < J->irtoplim) {	293✔
97	/* More than half of the buffer is free on top: shift up by a quarter. */
98	MSize ofs = szins >> 2;	76✔
99	memmove(baseir + ofs, baseir, (J->cur.nins - J->irbotlim)*sizeof(IRIns));	76✔
100	J->irbotlim -= ofs;	76✔
101	J->irtoplim -= ofs;	76✔
102	J->cur.ir = J->irbuf = baseir - J->irbotlim;	76✔
103	} else {
104	/* Double the buffer size, but split the growth amongst top/bottom. */
105	IRIns newbase = lj_mem_newt(J->L, 2szins*sizeof(IRIns), IRIns);	217✔
106	MSize ofs = szins >= 256 ? 128 : (szins >> 1); /* Limit bottom growth. */	217✔
107	memcpy(newbase + ofs, baseir, (J->cur.nins - J->irbotlim)*sizeof(IRIns));	217✔
108	lj_mem_free(G(J->L), baseir, szins*sizeof(IRIns));	217✔
109	J->irbotlim -= ofs;	217✔
110	J->irtoplim = J->irbotlim + 2*szins;	217✔
111	J->cur.ir = J->irbuf = newbase - J->irbotlim;	217✔
112	}
113	}	293✔
114
115	/* Emit IR without any optimizations. */
116	TRef LJ_FASTCALL lj_ir_emit(jit_State *J)	1,981,912✔
117	{
118	IRRef ref = lj_ir_nextins(J);	1,981,912✔
119	IRIns *ir = IR(ref);	1,981,912✔
120	IROp op = fins->o;	1,981,912✔
121	ir->prev = J->chain[op];	1,981,912✔
122	J->chain[op] = (IRRef1)ref;	1,981,912✔
123	ir->o = op;	1,981,912✔
124	ir->op1 = fins->op1;	1,981,912✔
125	ir->op2 = fins->op2;	1,981,912✔
126	J->guardemit.irt \|= fins->t.irt;	1,981,912✔
127	return TREF(ref, irt_t((ir->t = fins->t)));	1,981,912✔
128	}
129
130	/* Emit call to a C function. */
131	TRef lj_ir_call(jit_State *J, IRCallID id, ...)	602✔
132	{
133	const CCallInfo *ci = &lj_ir_callinfo[id];	602✔
134	uint32_t n = CCI_NARGS(ci);	602✔
135	TRef tr = TREF_NIL;	602✔
136	va_list argp;	602✔
137	va_start(argp, id);	602✔
138	if ((ci->flags & CCI_L)) n--;	602✔
139	if (n > 0)	602✔
140	tr = va_arg(argp, IRRef);	601✔
141	while (n-- > 1)	1,750✔
142	tr = emitir(IRT(IR_CARG, IRT_NIL), tr, va_arg(argp, IRRef));	1,148✔
143	va_end(argp);	602✔
144	if (CCI_OP(ci) == IR_CALLS)	602✔
145	J->needsnap = 1; /* Need snapshot after call with side effect. */	152✔
146	return emitir(CCI_OPTYPE(ci), tr, id);	602✔
147	}
148
149	/* Load field of type t from GG_State + offset. Must be 32 bit aligned. */
150	LJ_FUNC TRef lj_ir_ggfload(jit_State *J, IRType t, uintptr_t ofs)	466✔
151	{
152	lj_assertJ((ofs & 3) == 0, "unaligned GG_State field offset");	466✔
153	ofs >>= 2;	466✔
154	lj_assertJ(ofs >= IRFL__MAX && ofs <= 0x3ff,	466✔
155	"GG_State field offset breaks 10 bit FOLD key limit");
156	lj_ir_set(J, IRT(IR_FLOAD, t), REF_NIL, ofs);	466✔
157	return lj_opt_fold(J);	466✔
158	}
159
160	/* -- Interning of constants ---------------------------------------------- */
161
162	/*
163	** IR instructions for constants are kept between J->cur.nk >= ref < REF_BIAS.
164	** They are chained like all other instructions, but grow downwards.
165	** The are interned (like strings in the VM) to facilitate reference
166	** comparisons. The same constant must get the same reference.
167	*/
168
169	/* Get ref of next IR constant and optionally grow IR.
170	** Note: this may invalidate all IRIns *!
171	*/
172	static LJ_AINLINE IRRef ir_nextk(jit_State *J)	389,884✔
173	{
174	IRRef ref = J->cur.nk;	389,884✔
175	if (LJ_UNLIKELY(ref <= J->irbotlim)) lj_ir_growbot(J);	78✔
176	J->cur.nk = --ref;	389,884✔
177	return ref;	389,884✔
178	}
179
180	/* Get ref of next 64 bit IR constant and optionally grow IR.
181	** Note: this may invalidate all IRIns *!
182	*/
183	static LJ_AINLINE IRRef ir_nextk64(jit_State *J)	888,989✔
184	{
185	IRRef ref = J->cur.nk - 2;	888,989✔
186	lj_assertJ(J->state != LJ_TRACE_ASM, "bad JIT state");	888,989✔
187	if (LJ_UNLIKELY(ref < J->irbotlim)) lj_ir_growbot(J);	215✔
188	J->cur.nk = ref;	888,989✔
189	return ref;	888,989✔
190	}
191
192	#if LJ_GC64
193	#define ir_nextkgc ir_nextk64
194	#else
195	#define ir_nextkgc ir_nextk
196	#endif
197
198	/* Intern int32_t constant. */
199	TRef LJ_FASTCALL lj_ir_kint(jit_State *J, int32_t k)	2,090,037✔
200	{
201	IRIns ir, cir = J->cur.ir;	2,090,037✔
202	IRRef ref;	2,090,037✔
203	for (ref = J->chain[IR_KINT]; ref; ref = cir[ref].prev)	8,629,418✔
204	if (cir[ref].i == k)	8,461,468✔
205	goto found;	1,922,087✔
206	ref = ir_nextk(J);	167,950✔
207	ir = IR(ref);	167,950✔
208	ir->i = k;	167,950✔
209	ir->t.irt = IRT_INT;	167,950✔
210	ir->o = IR_KINT;	167,950✔
211	ir->prev = J->chain[IR_KINT];	167,950✔
212	J->chain[IR_KINT] = (IRRef1)ref;	167,950✔
213	found:	2,090,037✔
214	return TREF(ref, IRT_INT);	2,090,037✔
215	}
216
217	/* Intern 64 bit constant, given by its 64 bit pattern. */
218	TRef lj_ir_k64(jit_State *J, IROp op, uint64_t u64)	1,261,321✔
219	{
220	IRIns ir, cir = J->cur.ir;	1,261,321✔
221	IRRef ref;	1,261,321✔
222	IRType t = op == IR_KNUM ? IRT_NUM : IRT_I64;	1,261,321✔
223	for (ref = J->chain[op]; ref; ref = cir[ref].prev)	9,177,771✔
224	if (ir_k64(&cir[ref])->u64 == u64)	8,877,652✔
225	goto found;	961,202✔
226	ref = ir_nextk64(J);	300,119✔
227	ir = IR(ref);	300,119✔
228	ir[1].tv.u64 = u64;	300,119✔
229	ir->t.irt = t;	300,119✔
230	ir->o = op;	300,119✔
231	ir->op12 = 0;	300,119✔
232	ir->prev = J->chain[op];	300,119✔
233	J->chain[op] = (IRRef1)ref;	300,119✔
234	found:	1,261,321✔
235	return TREF(ref, t);	1,261,321✔
236	}
237
238	/* Intern FP constant, given by its 64 bit pattern. */
239	TRef lj_ir_knum_u64(jit_State *J, uint64_t u64)	376,705✔
240	{
241	return lj_ir_k64(J, IR_KNUM, u64);	376,705✔
242	}
243
244	/* Intern 64 bit integer constant. */
245	TRef lj_ir_kint64(jit_State *J, uint64_t u64)	113,958✔
246	{
247	return lj_ir_k64(J, IR_KINT64, u64);	113,958✔
248	}
249
250	/* Check whether a number is int and return it. -0 is NOT considered an int. */
251	static int numistrueint(lua_Number n, int32_t *kp)	233,094✔
252	{
253	int32_t k = lj_num2int(n);	233,094✔
254	if (n == (lua_Number)k) {	233,094✔
255	if (kp) *kp = k;	231,079✔
256	if (k == 0) { /* Special check for -0. */	231,079✔
257	TValue tv;	31,609✔
258	setnumV(&tv, n);	31,609✔
259	if (tv.u32.hi != 0)	31,609✔
260	return 0;
261	}
262	return 1;	231,079✔
263	}
264	return 0;
265	}
266
267	/* Intern number as int32_t constant if possible, otherwise as FP constant. */
268	TRef lj_ir_knumint(jit_State *J, lua_Number n)	233,094✔
269	{
270	int32_t k;	233,094✔
271	if (numistrueint(n, &k))	233,094✔
272	return lj_ir_kint(J, k);	231,079✔
273	else
274	return lj_ir_knum(J, n);	2,015✔
275	}
276
277	/* Intern GC object "constant". */
278	TRef lj_ir_kgc(jit_State J, GCobj o, IRType t)	3,787,315✔
279	{
280	IRIns ir, cir = J->cur.ir;	3,787,315✔
281	IRRef ref;	3,787,315✔
282	lj_assertJ(!isdead(J2G(J), o), "interning of dead GC object");	3,787,315✔
283	for (ref = J->chain[IR_KGC]; ref; ref = cir[ref].prev)	33,002,297✔
284	if (ir_kgc(&cir[ref]) == o)	32,485,885✔
285	goto found;	3,270,903✔
286	ref = ir_nextkgc(J);	516,412✔
287	ir = IR(ref);	516,412✔
288	/* NOBARRIER: Current trace is a GC root. */
289	ir->op12 = 0;	516,412✔
290	setgcref(ir[LJ_GC64].gcr, o);	516,412✔
291	ir->t.irt = (uint8_t)t;	516,412✔
292	ir->o = IR_KGC;	516,412✔
293	ir->prev = J->chain[IR_KGC];	516,412✔
294	J->chain[IR_KGC] = (IRRef1)ref;	516,412✔
295	found:	3,787,315✔
296	return TREF(ref, t);	3,787,315✔
297	}
298
299	/* Allocate GCtrace constant placeholder (no interning). */
300	TRef lj_ir_ktrace(jit_State *J)	200✔
301	{
302	IRRef ref = ir_nextkgc(J);	200✔
303	IRIns *ir = IR(ref);	200✔
304	lj_assertJ(irt_toitype_(IRT_P64) == LJ_TTRACE, "mismatched type mapping");	200✔
305	ir->t.irt = IRT_P64;	200✔
306	ir->o = LJ_GC64 ? IR_KNUM : IR_KNULL; /* Not IR_KGC yet, but same size. */	200✔
307	ir->op12 = 0;	200✔
308	ir->prev = 0;	200✔
309	return TREF(ref, IRT_P64);	200✔
310	}
311
312	/* Intern pointer constant. */
313	TRef lj_ir_kptr_(jit_State J, IROp op, void ptr)	184,394✔
314	{
315	IRIns ir, cir = J->cur.ir;	184,394✔
316	IRRef ref;	184,394✔
317	#if LJ_64 && !LJ_GC64
318	lj_assertJ((void *)(uintptr_t)u32ptr(ptr) == ptr, "out-of-range GC pointer");
319	#endif
320	for (ref = J->chain[op]; ref; ref = cir[ref].prev)	342,609✔
321	if (ir_kptr(&cir[ref]) == ptr)	270,351✔
322	goto found;	112,136✔
323	#if LJ_GC64
324	ref = ir_nextk64(J);	72,258✔
325	#else
326	ref = ir_nextk(J);
327	#endif
328	ir = IR(ref);	72,258✔
329	ir->op12 = 0;	72,258✔
330	setmref(ir[LJ_GC64].ptr, ptr);	72,258✔
331	ir->t.irt = IRT_PGC;	72,258✔
332	ir->o = op;	72,258✔
333	ir->prev = J->chain[op];	72,258✔
334	J->chain[op] = (IRRef1)ref;	72,258✔
335	found:	184,394✔
336	return TREF(ref, IRT_PGC);	184,394✔
337	}
338
339	/* Intern typed NULL constant. */
340	TRef lj_ir_knull(jit_State *J, IRType t)	305,603✔
341	{
342	IRIns ir, cir = J->cur.ir;	305,603✔
343	IRRef ref;	305,603✔
344	for (ref = J->chain[IR_KNULL]; ref; ref = cir[ref].prev)	305,686✔
345	if (irt_t(cir[ref].t) == t)	290,390✔
346	goto found;	290,307✔
347	ref = ir_nextk(J);	15,296✔
348	ir = IR(ref);	15,296✔
349	ir->i = 0;	15,296✔
350	ir->t.irt = (uint8_t)t;	15,296✔
351	ir->o = IR_KNULL;	15,296✔
352	ir->prev = J->chain[IR_KNULL];	15,296✔
353	J->chain[IR_KNULL] = (IRRef1)ref;	15,296✔
354	found:	305,603✔
355	return TREF(ref, t);	305,603✔
356	}
357
358	/* Intern key slot. */
359	TRef lj_ir_kslot(jit_State *J, TRef key, IRRef slot)	1,354,877✔
360	{
361	IRIns ir, cir = J->cur.ir;	1,354,877✔
362	IRRef2 op12 = IRREF2((IRRef1)key, (IRRef1)slot);	1,354,877✔
363	IRRef ref;	1,354,877✔
364	/* Const part is not touched by CSE/DCE, so 0-65535 is ok for IRMlit here. */
365	lj_assertJ(tref_isk(key) && slot == (IRRef)(IRRef1)slot,	1,354,877✔
366	"out-of-range key/slot");
367	for (ref = J->chain[IR_KSLOT]; ref; ref = cir[ref].prev)	5,961,729✔
368	if (cir[ref].op12 == op12)	5,755,091✔
369	goto found;	1,148,239✔
370	ref = ir_nextk(J);	206,638✔
371	ir = IR(ref);	206,638✔
372	ir->op12 = op12;	206,638✔
373	ir->t.irt = IRT_P32;	206,638✔
374	ir->o = IR_KSLOT;	206,638✔
375	ir->prev = J->chain[IR_KSLOT];	206,638✔
376	J->chain[IR_KSLOT] = (IRRef1)ref;	206,638✔
377	found:	1,354,877✔
378	return TREF(ref, IRT_P32);	1,354,877✔
379	}
380
381	/* -- Access to IR constants ---------------------------------------------- */
382
383	/* Copy value of IR constant. */
384	void lj_ir_kvalue(lua_State L, TValue tv, const IRIns *ir)	556,070✔
385	{
386	UNUSED(L);	556,070✔
387	lj_assertL(ir->o != IR_KSLOT, "unexpected KSLOT"); /* Common mistake. */	556,070✔
388	switch (ir->o) {	556,070✔
389	case IR_KPRI: setpriV(tv, irt_toitype(ir->t)); break;	15,496✔
390	case IR_KINT: setintV(tv, ir->i); break;	10,509✔
391	case IR_KGC: setgcV(L, tv, ir_kgc(ir), irt_toitype(ir->t)); break;	381,297✔
392	case IR_KPTR: case IR_KKPTR:	×
393	setnumV(tv, (lua_Number)(uintptr_t)ir_kptr(ir));	×
394	break;	×
395	case IR_KNULL: setintV(tv, 0); break;	1✔
396	case IR_KNUM: setnumV(tv, ir_knum(ir)->n); break;	148,767✔
397	#if LJ_HASFFI
398	case IR_KINT64: {
399	GCcdata *cd = lj_cdata_new_(L, CTID_INT64, 8);	×
400	(uint64_t )cdataptr(cd) = ir_kint64(ir)->u64;	×
401	setcdataV(L, tv, cd);	×
402	break;
403	}
404	#endif
405	default: lj_assertL(0, "bad IR constant op %d", ir->o); break;
406	}
407	}	556,070✔
408
409	/* -- Convert IR operand types -------------------------------------------- */
410
411	/* Convert from string to number. */
412	TRef LJ_FASTCALL lj_ir_tonumber(jit_State *J, TRef tr)	209,560✔
413	{
414	if (!tref_isnumber(tr)) {	209,560✔
415	if (tref_isstr(tr))	×
416	tr = emitir(IRTG(IR_STRTO, IRT_NUM), tr, 0);	×
417	else
418	lj_trace_err(J, LJ_TRERR_BADTYPE);	×
419	}
420	return tr;	209,560✔
421	}
422
423	/* Convert from integer or string to number. */
424	TRef LJ_FASTCALL lj_ir_tonum(jit_State *J, TRef tr)	927✔
425	{
426	if (!tref_isnum(tr)) {	927✔
427	if (tref_isinteger(tr))	222✔
428	tr = emitir(IRTN(IR_CONV), tr, IRCONV_NUM_INT);	222✔
429	else if (tref_isstr(tr))	×
430	tr = emitir(IRTG(IR_STRTO, IRT_NUM), tr, 0);	×
431	else
432	lj_trace_err(J, LJ_TRERR_BADTYPE);	×
433	}
434	return tr;	927✔
435	}
436
437	/* Convert from integer or number to string. */
438	TRef LJ_FASTCALL lj_ir_tostr(jit_State *J, TRef tr)	697✔
439	{
440	if (!tref_isstr(tr)) {	697✔
441	if (!tref_isnumber(tr))	4✔
442	lj_trace_err(J, LJ_TRERR_BADTYPE);	×
443	tr = emitir(IRT(IR_TOSTR, IRT_STR), tr,	4✔
444	tref_isnum(tr) ? IRTOSTR_NUM : IRTOSTR_INT);
445	}
446	return tr;	697✔
447	}
448
449	/* -- Miscellaneous IR ops ------------------------------------------------ */
450
451	/* Evaluate numeric comparison. */
452	int lj_ir_numcmp(lua_Number a, lua_Number b, IROp op)	204,336✔
453	{
454	switch (op) {	204,336✔
455	case IR_EQ: return (a == b);	4✔
456	case IR_NE: return (a != b);	×
457	case IR_LT: return (a < b);	34✔
458	case IR_GE: return (a >= b);	33✔
459	case IR_LE: return (a <= b);	291✔
460	case IR_GT: return (a > b);	12✔
461	case IR_ULT: return !(a >= b);	×
462	case IR_UGE: return !(a < b);	13,539✔
463	case IR_ULE: return !(a > b);	×
464	case IR_UGT: return !(a <= b);	190,423✔
465	default: lj_assertX(0, "bad IR op %d", op); return 0;
466	}
467	}
468
469	/* Evaluate string comparison. */
470	int lj_ir_strcmp(GCstr a, GCstr b, IROp op)	1✔
471	{
472	int res = lj_str_cmp(a, b);	1✔
473	switch (op) {	1✔
474	case IR_LT: return (res < 0);	×
475	case IR_GE: return (res >= 0);	×
476	case IR_LE: return (res <= 0);	1✔
477	case IR_GT: return (res > 0);	×
478	default: lj_assertX(0, "bad IR op %d", op); return 0;
479	}
480	}
481
482	/* Rollback IR to previous state. */
483	void lj_ir_rollback(jit_State *J, IRRef ref)	539,713✔
484	{
485	IRRef nins = J->cur.nins;	539,713✔
486	while (nins > ref) {	545,222✔
487	IRIns *ir;	5,509✔
488	nins--;	5,509✔
489	ir = IR(nins);	5,509✔
490	J->chain[ir->o] = ir->prev;	5,509✔
491	}
492	J->cur.nins = nins;	539,713✔
493	}	539,713✔
494
495	#undef IR
496	#undef fins
497	#undef emitir
498
499	#endif

tarantool / luajit / 9563738134

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