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Aegisub/subprojects/luajit/src/lj_crecord.c

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/*
** Trace recorder for C data operations.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
*/
#define lj_ffrecord_c
#define LUA_CORE
#include "lj_obj.h"
#if LJ_HASJIT && LJ_HASFFI
#include "lj_err.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_frame.h"
#include "lj_ctype.h"
#include "lj_cdata.h"
#include "lj_cparse.h"
#include "lj_cconv.h"
#include "lj_clib.h"
#include "lj_ccall.h"
#include "lj_ff.h"
#include "lj_ir.h"
#include "lj_jit.h"
#include "lj_ircall.h"
#include "lj_iropt.h"
#include "lj_trace.h"
#include "lj_record.h"
#include "lj_ffrecord.h"
#include "lj_snap.h"
#include "lj_crecord.h"
#include "lj_dispatch.h"
/* Some local macros to save typing. Undef'd at the end. */
#define IR(ref) (&J->cur.ir[(ref)])
/* 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))
#define emitconv(a, dt, st, flags) \
emitir(IRT(IR_CONV, (dt)), (a), (st)|((dt) << 5)|(flags))
/* -- C type checks ------------------------------------------------------- */
static GCcdata *argv2cdata(jit_State *J, TRef tr, cTValue *o)
{
GCcdata *cd;
TRef trtypeid;
if (!tref_iscdata(tr))
lj_trace_err(J, LJ_TRERR_BADTYPE);
cd = cdataV(o);
/* Specialize to the CTypeID. */
trtypeid = emitir(IRT(IR_FLOAD, IRT_U16), tr, IRFL_CDATA_CTYPEID);
emitir(IRTG(IR_EQ, IRT_INT), trtypeid, lj_ir_kint(J, (int32_t)cd->ctypeid));
return cd;
}
/* Specialize to the CTypeID held by a cdata constructor. */
static CTypeID crec_constructor(jit_State *J, GCcdata *cd, TRef tr)
{
CTypeID id;
lua_assert(tref_iscdata(tr) && cd->ctypeid == CTID_CTYPEID);
id = *(CTypeID *)cdataptr(cd);
tr = emitir(IRT(IR_FLOAD, IRT_INT), tr, IRFL_CDATA_INT);
emitir(IRTG(IR_EQ, IRT_INT), tr, lj_ir_kint(J, (int32_t)id));
return id;
}
static CTypeID argv2ctype(jit_State *J, TRef tr, cTValue *o)
{
if (tref_isstr(tr)) {
GCstr *s = strV(o);
CPState cp;
CTypeID oldtop;
/* Specialize to the string containing the C type declaration. */
emitir(IRTG(IR_EQ, IRT_STR), tr, lj_ir_kstr(J, s));
cp.L = J->L;
cp.cts = ctype_ctsG(J2G(J));
oldtop = cp.cts->top;
cp.srcname = strdata(s);
cp.p = strdata(s);
cp.param = NULL;
cp.mode = CPARSE_MODE_ABSTRACT|CPARSE_MODE_NOIMPLICIT;
if (lj_cparse(&cp) || cp.cts->top > oldtop) /* Avoid new struct defs. */
lj_trace_err(J, LJ_TRERR_BADTYPE);
return cp.val.id;
} else {
GCcdata *cd = argv2cdata(J, tr, o);
return cd->ctypeid == CTID_CTYPEID ? crec_constructor(J, cd, tr) :
cd->ctypeid;
}
}
/* Convert CType to IRType (if possible). */
static IRType crec_ct2irt(CTState *cts, CType *ct)
{
if (ctype_isenum(ct->info)) ct = ctype_child(cts, ct);
if (LJ_LIKELY(ctype_isnum(ct->info))) {
if ((ct->info & CTF_FP)) {
if (ct->size == sizeof(double))
return IRT_NUM;
else if (ct->size == sizeof(float))
return IRT_FLOAT;
} else {
uint32_t b = lj_fls(ct->size);
if (b <= 3)
return IRT_I8 + 2*b + ((ct->info & CTF_UNSIGNED) ? 1 : 0);
}
} else if (ctype_isptr(ct->info)) {
return (LJ_64 && ct->size == 8) ? IRT_P64 : IRT_P32;
} else if (ctype_iscomplex(ct->info)) {
if (ct->size == 2*sizeof(double))
return IRT_NUM;
else if (ct->size == 2*sizeof(float))
return IRT_FLOAT;
}
return IRT_CDATA;
}
/* -- Optimized memory fill and copy -------------------------------------- */
/* Maximum length and unroll of inlined copy/fill. */
#define CREC_COPY_MAXUNROLL 16
#define CREC_COPY_MAXLEN 128
#define CREC_FILL_MAXUNROLL 16
/* Number of windowed registers used for optimized memory copy. */
#if LJ_TARGET_X86
#define CREC_COPY_REGWIN 2
#elif LJ_TARGET_PPC || LJ_TARGET_MIPS
#define CREC_COPY_REGWIN 8
#else
#define CREC_COPY_REGWIN 4
#endif
/* List of memory offsets for copy/fill. */
typedef struct CRecMemList {
CTSize ofs; /* Offset in bytes. */
IRType tp; /* Type of load/store. */
TRef trofs; /* TRef of interned offset. */
TRef trval; /* TRef of load value. */
} CRecMemList;
/* Generate copy list for element-wise struct copy. */
static MSize crec_copy_struct(CRecMemList *ml, CTState *cts, CType *ct)
{
CTypeID fid = ct->sib;
MSize mlp = 0;
while (fid) {
CType *df = ctype_get(cts, fid);
fid = df->sib;
if (ctype_isfield(df->info)) {
CType *cct;
IRType tp;
if (!gcref(df->name)) continue; /* Ignore unnamed fields. */
cct = ctype_rawchild(cts, df); /* Field type. */
tp = crec_ct2irt(cts, cct);
if (tp == IRT_CDATA) return 0; /* NYI: aggregates. */
if (mlp >= CREC_COPY_MAXUNROLL) return 0;
ml[mlp].ofs = df->size;
ml[mlp].tp = tp;
mlp++;
if (ctype_iscomplex(cct->info)) {
if (mlp >= CREC_COPY_MAXUNROLL) return 0;
ml[mlp].ofs = df->size + (cct->size >> 1);
ml[mlp].tp = tp;
mlp++;
}
} else if (!ctype_isconstval(df->info)) {
/* NYI: bitfields and sub-structures. */
return 0;
}
}
return mlp;
}
/* Generate unrolled copy list, from highest to lowest step size/alignment. */
static MSize crec_copy_unroll(CRecMemList *ml, CTSize len, CTSize step,
IRType tp)
{
CTSize ofs = 0;
MSize mlp = 0;
if (tp == IRT_CDATA) tp = IRT_U8 + 2*lj_fls(step);
do {
while (ofs + step <= len) {
if (mlp >= CREC_COPY_MAXUNROLL) return 0;
ml[mlp].ofs = ofs;
ml[mlp].tp = tp;
mlp++;
ofs += step;
}
step >>= 1;
tp -= 2;
} while (ofs < len);
return mlp;
}
/*
** Emit copy list with windowed loads/stores.
** LJ_TARGET_UNALIGNED: may emit unaligned loads/stores (not marked as such).
*/
static void crec_copy_emit(jit_State *J, CRecMemList *ml, MSize mlp,
TRef trdst, TRef trsrc)
{
MSize i, j, rwin = 0;
for (i = 0, j = 0; i < mlp; ) {
TRef trofs = lj_ir_kintp(J, ml[i].ofs);
TRef trsptr = emitir(IRT(IR_ADD, IRT_PTR), trsrc, trofs);
ml[i].trval = emitir(IRT(IR_XLOAD, ml[i].tp), trsptr, 0);
ml[i].trofs = trofs;
i++;
rwin += (LJ_SOFTFP && ml[i].tp == IRT_NUM) ? 2 : 1;
if (rwin >= CREC_COPY_REGWIN || i >= mlp) { /* Flush buffered stores. */
rwin = 0;
for ( ; j < i; j++) {
TRef trdptr = emitir(IRT(IR_ADD, IRT_PTR), trdst, ml[j].trofs);
emitir(IRT(IR_XSTORE, ml[j].tp), trdptr, ml[j].trval);
}
}
}
}
/* Optimized memory copy. */
static void crec_copy(jit_State *J, TRef trdst, TRef trsrc, TRef trlen,
CType *ct)
{
if (tref_isk(trlen)) { /* Length must be constant. */
CRecMemList ml[CREC_COPY_MAXUNROLL];
MSize mlp = 0;
CTSize step = 1, len = (CTSize)IR(tref_ref(trlen))->i;
IRType tp = IRT_CDATA;
int needxbar = 0;
if (len == 0) return; /* Shortcut. */
if (len > CREC_COPY_MAXLEN) goto fallback;
if (ct) {
CTState *cts = ctype_ctsG(J2G(J));
lua_assert(ctype_isarray(ct->info) || ctype_isstruct(ct->info));
if (ctype_isarray(ct->info)) {
CType *cct = ctype_rawchild(cts, ct);
tp = crec_ct2irt(cts, cct);
if (tp == IRT_CDATA) goto rawcopy;
step = lj_ir_type_size[tp];
lua_assert((len & (step-1)) == 0);
} else if ((ct->info & CTF_UNION)) {
step = (1u << ctype_align(ct->info));
goto rawcopy;
} else {
mlp = crec_copy_struct(ml, cts, ct);
goto emitcopy;
}
} else {
rawcopy:
needxbar = 1;
if (LJ_TARGET_UNALIGNED || step >= CTSIZE_PTR)
step = CTSIZE_PTR;
}
mlp = crec_copy_unroll(ml, len, step, tp);
emitcopy:
if (mlp) {
crec_copy_emit(J, ml, mlp, trdst, trsrc);
if (needxbar)
emitir(IRT(IR_XBAR, IRT_NIL), 0, 0);
return;
}
}
fallback:
/* Call memcpy. Always needs a barrier to disable alias analysis. */
lj_ir_call(J, IRCALL_memcpy, trdst, trsrc, trlen);
emitir(IRT(IR_XBAR, IRT_NIL), 0, 0);
}
/* Generate unrolled fill list, from highest to lowest step size/alignment. */
static MSize crec_fill_unroll(CRecMemList *ml, CTSize len, CTSize step)
{
CTSize ofs = 0;
MSize mlp = 0;
IRType tp = IRT_U8 + 2*lj_fls(step);
do {
while (ofs + step <= len) {
if (mlp >= CREC_COPY_MAXUNROLL) return 0;
ml[mlp].ofs = ofs;
ml[mlp].tp = tp;
mlp++;
ofs += step;
}
step >>= 1;
tp -= 2;
} while (ofs < len);
return mlp;
}
/*
** Emit stores for fill list.
** LJ_TARGET_UNALIGNED: may emit unaligned stores (not marked as such).
*/
static void crec_fill_emit(jit_State *J, CRecMemList *ml, MSize mlp,
TRef trdst, TRef trfill)
{
MSize i;
for (i = 0; i < mlp; i++) {
TRef trofs = lj_ir_kintp(J, ml[i].ofs);
TRef trdptr = emitir(IRT(IR_ADD, IRT_PTR), trdst, trofs);
emitir(IRT(IR_XSTORE, ml[i].tp), trdptr, trfill);
}
}
/* Optimized memory fill. */
static void crec_fill(jit_State *J, TRef trdst, TRef trlen, TRef trfill,
CTSize step)
{
if (tref_isk(trlen)) { /* Length must be constant. */
CRecMemList ml[CREC_FILL_MAXUNROLL];
MSize mlp;
CTSize len = (CTSize)IR(tref_ref(trlen))->i;
if (len == 0) return; /* Shortcut. */
if (LJ_TARGET_UNALIGNED || step >= CTSIZE_PTR)
step = CTSIZE_PTR;
if (step * CREC_FILL_MAXUNROLL < len) goto fallback;
mlp = crec_fill_unroll(ml, len, step);
if (!mlp) goto fallback;
if (tref_isk(trfill) || ml[0].tp != IRT_U8)
trfill = emitconv(trfill, IRT_INT, IRT_U8, 0);
if (ml[0].tp != IRT_U8) { /* Scatter U8 to U16/U32/U64. */
if (CTSIZE_PTR == 8 && ml[0].tp == IRT_U64) {
if (tref_isk(trfill)) /* Pointless on x64 with zero-extended regs. */
trfill = emitconv(trfill, IRT_U64, IRT_U32, 0);
trfill = emitir(IRT(IR_MUL, IRT_U64), trfill,
lj_ir_kint64(J, U64x(01010101,01010101)));
} else {
trfill = emitir(IRTI(IR_MUL), trfill,
lj_ir_kint(J, ml[0].tp == IRT_U16 ? 0x0101 : 0x01010101));
}
}
crec_fill_emit(J, ml, mlp, trdst, trfill);
} else {
fallback:
/* Call memset. Always needs a barrier to disable alias analysis. */
lj_ir_call(J, IRCALL_memset, trdst, trfill, trlen); /* Note: arg order! */
}
emitir(IRT(IR_XBAR, IRT_NIL), 0, 0);
}
/* -- Convert C type to C type -------------------------------------------- */
/*
** This code mirrors the code in lj_cconv.c. It performs the same steps
** for the trace recorder that lj_cconv.c does for the interpreter.
**
** One major difference is that we can get away with much fewer checks
** here. E.g. checks for casts, constness or correct types can often be
** omitted, even if they might fail. The interpreter subsequently throws
** an error, which aborts the trace.
**
** All operations are specialized to their C types, so the on-trace
** outcome must be the same as the outcome in the interpreter. If the
** interpreter doesn't throw an error, then the trace is correct, too.
** Care must be taken not to generate invalid (temporary) IR or to
** trigger asserts.
*/
/* Determine whether a passed number or cdata number is non-zero. */
static int crec_isnonzero(CType *s, void *p)
{
if (p == (void *)0)
return 0;
if (p == (void *)1)
return 1;
if ((s->info & CTF_FP)) {
if (s->size == sizeof(float))
return (*(float *)p != 0);
else
return (*(double *)p != 0);
} else {
if (s->size == 1)
return (*(uint8_t *)p != 0);
else if (s->size == 2)
return (*(uint16_t *)p != 0);
else if (s->size == 4)
return (*(uint32_t *)p != 0);
else
return (*(uint64_t *)p != 0);
}
}
static TRef crec_ct_ct(jit_State *J, CType *d, CType *s, TRef dp, TRef sp,
void *svisnz)
{
IRType dt = crec_ct2irt(ctype_ctsG(J2G(J)), d);
IRType st = crec_ct2irt(ctype_ctsG(J2G(J)), s);
CTSize dsize = d->size, ssize = s->size;
CTInfo dinfo = d->info, sinfo = s->info;
if (ctype_type(dinfo) > CT_MAYCONVERT || ctype_type(sinfo) > CT_MAYCONVERT)
goto err_conv;
/*
** Note: Unlike lj_cconv_ct_ct(), sp holds the _value_ of pointers and
** numbers up to 8 bytes. Otherwise sp holds a pointer.
*/
switch (cconv_idx2(dinfo, sinfo)) {
/* Destination is a bool. */
case CCX(B, B):
goto xstore; /* Source operand is already normalized. */
case CCX(B, I):
case CCX(B, F):
if (st != IRT_CDATA) {
/* Specialize to the result of a comparison against 0. */
TRef zero = (st == IRT_NUM || st == IRT_FLOAT) ? lj_ir_knum(J, 0) :
(st == IRT_I64 || st == IRT_U64) ? lj_ir_kint64(J, 0) :
lj_ir_kint(J, 0);
int isnz = crec_isnonzero(s, svisnz);
emitir(IRTG(isnz ? IR_NE : IR_EQ, st), sp, zero);
sp = lj_ir_kint(J, isnz);
goto xstore;
}
goto err_nyi;
/* Destination is an integer. */
case CCX(I, B):
case CCX(I, I):
conv_I_I:
if (dt == IRT_CDATA || st == IRT_CDATA) goto err_nyi;
/* Extend 32 to 64 bit integer. */
if (dsize == 8 && ssize < 8 && !(LJ_64 && (sinfo & CTF_UNSIGNED)))
sp = emitconv(sp, dt, ssize < 4 ? IRT_INT : st,
(sinfo & CTF_UNSIGNED) ? 0 : IRCONV_SEXT);
else if (dsize < 8 && ssize == 8) /* Truncate from 64 bit integer. */
sp = emitconv(sp, dsize < 4 ? IRT_INT : dt, st, 0);
else if (st == IRT_INT)
sp = lj_opt_narrow_toint(J, sp);
xstore:
if (dt == IRT_I64 || dt == IRT_U64) lj_needsplit(J);
if (dp == 0) return sp;
emitir(IRT(IR_XSTORE, dt), dp, sp);
break;
case CCX(I, C):
sp = emitir(IRT(IR_XLOAD, st), sp, 0); /* Load re. */
/* fallthrough */
case CCX(I, F):
if (dt == IRT_CDATA || st == IRT_CDATA) goto err_nyi;
sp = emitconv(sp, dsize < 4 ? IRT_INT : dt, st, IRCONV_TRUNC|IRCONV_ANY);
goto xstore;
case CCX(I, P):
case CCX(I, A):
sinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
ssize = CTSIZE_PTR;
st = IRT_UINTP;
if (((dsize ^ ssize) & 8) == 0) { /* Must insert no-op type conversion. */
sp = emitconv(sp, dsize < 4 ? IRT_INT : dt, IRT_PTR, 0);
goto xstore;
}
goto conv_I_I;
/* Destination is a floating-point number. */
case CCX(F, B):
case CCX(F, I):
conv_F_I:
if (dt == IRT_CDATA || st == IRT_CDATA) goto err_nyi;
sp = emitconv(sp, dt, ssize < 4 ? IRT_INT : st, 0);
goto xstore;
case CCX(F, C):
sp = emitir(IRT(IR_XLOAD, st), sp, 0); /* Load re. */
/* fallthrough */
case CCX(F, F):
conv_F_F:
if (dt == IRT_CDATA || st == IRT_CDATA) goto err_nyi;
if (dt != st) sp = emitconv(sp, dt, st, 0);
goto xstore;
/* Destination is a complex number. */
case CCX(C, I):
case CCX(C, F):
{ /* Clear im. */
TRef ptr = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, (dsize >> 1)));
emitir(IRT(IR_XSTORE, dt), ptr, lj_ir_knum(J, 0));
}
/* Convert to re. */
if ((sinfo & CTF_FP)) goto conv_F_F; else goto conv_F_I;
case CCX(C, C):
if (dt == IRT_CDATA || st == IRT_CDATA) goto err_nyi;
{
TRef re, im, ptr;
re = emitir(IRT(IR_XLOAD, st), sp, 0);
ptr = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, (ssize >> 1)));
im = emitir(IRT(IR_XLOAD, st), ptr, 0);
if (dt != st) {
re = emitconv(re, dt, st, 0);
im = emitconv(im, dt, st, 0);
}
emitir(IRT(IR_XSTORE, dt), dp, re);
ptr = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, (dsize >> 1)));
emitir(IRT(IR_XSTORE, dt), ptr, im);
}
break;
/* Destination is a vector. */
case CCX(V, I):
case CCX(V, F):
case CCX(V, C):
case CCX(V, V):
goto err_nyi;
/* Destination is a pointer. */
case CCX(P, P):
case CCX(P, A):
case CCX(P, S):
/* There are only 32 bit pointers/addresses on 32 bit machines.
** Also ok on x64, since all 32 bit ops clear the upper part of the reg.
*/
goto xstore;
case CCX(P, I):
if (st == IRT_CDATA) goto err_nyi;
if (!LJ_64 && ssize == 8) /* Truncate from 64 bit integer. */
sp = emitconv(sp, IRT_U32, st, 0);
goto xstore;
case CCX(P, F):
if (st == IRT_CDATA) goto err_nyi;
/* The signed conversion is cheaper. x64 really has 47 bit pointers. */
sp = emitconv(sp, (LJ_64 && dsize == 8) ? IRT_I64 : IRT_U32,
st, IRCONV_TRUNC|IRCONV_ANY);
goto xstore;
/* Destination is an array. */
case CCX(A, A):
/* Destination is a struct/union. */
case CCX(S, S):
if (dp == 0) goto err_conv;
crec_copy(J, dp, sp, lj_ir_kint(J, dsize), d);
break;
default:
err_conv:
err_nyi:
lj_trace_err(J, LJ_TRERR_NYICONV);
break;
}
return 0;
}
/* -- Convert C type to TValue (load) ------------------------------------- */
static TRef crec_tv_ct(jit_State *J, CType *s, CTypeID sid, TRef sp)
{
CTState *cts = ctype_ctsG(J2G(J));
IRType t = crec_ct2irt(cts, s);
CTInfo sinfo = s->info;
if (ctype_isnum(sinfo)) {
TRef tr;
if (t == IRT_CDATA)
goto err_nyi; /* NYI: copyval of >64 bit integers. */
tr = emitir(IRT(IR_XLOAD, t), sp, 0);
if (t == IRT_FLOAT || t == IRT_U32) { /* Keep uint32_t/float as numbers. */
return emitconv(tr, IRT_NUM, t, 0);
} else if (t == IRT_I64 || t == IRT_U64) { /* Box 64 bit integer. */
sp = tr;
lj_needsplit(J);
} else if ((sinfo & CTF_BOOL)) {
/* Assume not equal to zero. Fixup and emit pending guard later. */
lj_ir_set(J, IRTGI(IR_NE), tr, lj_ir_kint(J, 0));
J->postproc = LJ_POST_FIXGUARD;
return TREF_TRUE;
} else {
return tr;
}
} else if (ctype_isptr(sinfo) || ctype_isenum(sinfo)) {
sp = emitir(IRT(IR_XLOAD, t), sp, 0); /* Box pointers and enums. */
} else if (ctype_isrefarray(sinfo) || ctype_isstruct(sinfo)) {
cts->L = J->L;
sid = lj_ctype_intern(cts, CTINFO_REF(sid), CTSIZE_PTR); /* Create ref. */
} else if (ctype_iscomplex(sinfo)) { /* Unbox/box complex. */
ptrdiff_t esz = (ptrdiff_t)(s->size >> 1);
TRef ptr, tr1, tr2, dp;
dp = emitir(IRTG(IR_CNEW, IRT_CDATA), lj_ir_kint(J, sid), TREF_NIL);
tr1 = emitir(IRT(IR_XLOAD, t), sp, 0);
ptr = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, esz));
tr2 = emitir(IRT(IR_XLOAD, t), ptr, 0);
ptr = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, sizeof(GCcdata)));
emitir(IRT(IR_XSTORE, t), ptr, tr1);
ptr = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, sizeof(GCcdata)+esz));
emitir(IRT(IR_XSTORE, t), ptr, tr2);
return dp;
} else {
/* NYI: copyval of vectors. */
err_nyi:
lj_trace_err(J, LJ_TRERR_NYICONV);
}
/* Box pointer, ref, enum or 64 bit integer. */
return emitir(IRTG(IR_CNEWI, IRT_CDATA), lj_ir_kint(J, sid), sp);
}
/* -- Convert TValue to C type (store) ------------------------------------ */
static TRef crec_ct_tv(jit_State *J, CType *d, TRef dp, TRef sp, cTValue *sval)
{
CTState *cts = ctype_ctsG(J2G(J));
CTypeID sid = CTID_P_VOID;
void *svisnz = 0;
CType *s;
if (LJ_LIKELY(tref_isinteger(sp))) {
sid = CTID_INT32;
svisnz = (void *)(intptr_t)(tvisint(sval)?(intV(sval)!=0):!tviszero(sval));
} else if (tref_isnum(sp)) {
sid = CTID_DOUBLE;
svisnz = (void *)(intptr_t)(tvisint(sval)?(intV(sval)!=0):!tviszero(sval));
} else if (tref_isbool(sp)) {
sp = lj_ir_kint(J, tref_istrue(sp) ? 1 : 0);
sid = CTID_BOOL;
} else if (tref_isnil(sp)) {
sp = lj_ir_kptr(J, NULL);
} else if (tref_isudata(sp)) {
GCudata *ud = udataV(sval);
if (ud->udtype == UDTYPE_IO_FILE) {
TRef tr = emitir(IRT(IR_FLOAD, IRT_U8), sp, IRFL_UDATA_UDTYPE);
emitir(IRTGI(IR_EQ), tr, lj_ir_kint(J, UDTYPE_IO_FILE));
sp = emitir(IRT(IR_FLOAD, IRT_PTR), sp, IRFL_UDATA_FILE);
} else {
sp = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, sizeof(GCudata)));
}
} else if (tref_isstr(sp)) {
if (ctype_isenum(d->info)) { /* Match string against enum constant. */
GCstr *str = strV(sval);
CTSize ofs;
CType *cct = lj_ctype_getfield(cts, d, str, &ofs);
/* Specialize to the name of the enum constant. */
emitir(IRTG(IR_EQ, IRT_STR), sp, lj_ir_kstr(J, str));
if (cct && ctype_isconstval(cct->info)) {
lua_assert(ctype_child(cts, cct)->size == 4);
svisnz = (void *)(intptr_t)(ofs != 0);
sp = lj_ir_kint(J, (int32_t)ofs);
sid = ctype_cid(cct->info);
} /* else: interpreter will throw. */
} else if (ctype_isrefarray(d->info)) { /* Copy string to array. */
lj_trace_err(J, LJ_TRERR_BADTYPE); /* NYI */
} else { /* Otherwise pass the string data as a const char[]. */
/* Don't use STRREF. It folds with SNEW, which loses the trailing NUL. */
sp = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, sizeof(GCstr)));
sid = CTID_A_CCHAR;
}
} else { /* NYI: tref_istab(sp), tref_islightud(sp). */
IRType t;
sid = argv2cdata(J, sp, sval)->ctypeid;
s = ctype_raw(cts, sid);
svisnz = cdataptr(cdataV(sval));
t = crec_ct2irt(cts, s);
if (ctype_isptr(s->info)) {
sp = emitir(IRT(IR_FLOAD, t), sp, IRFL_CDATA_PTR);
if (ctype_isref(s->info)) {
svisnz = *(void **)svisnz;
s = ctype_rawchild(cts, s);
if (ctype_isenum(s->info)) s = ctype_child(cts, s);
t = crec_ct2irt(cts, s);
} else {
goto doconv;
}
} else if (t == IRT_I64 || t == IRT_U64) {
sp = emitir(IRT(IR_FLOAD, t), sp, IRFL_CDATA_INT64);
lj_needsplit(J);
goto doconv;
} else if (t == IRT_INT || t == IRT_U32) {
if (ctype_isenum(s->info)) s = ctype_child(cts, s);
sp = emitir(IRT(IR_FLOAD, t), sp, IRFL_CDATA_INT);
goto doconv;
} else {
sp = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, sizeof(GCcdata)));
}
if (ctype_isnum(s->info) && t != IRT_CDATA)
sp = emitir(IRT(IR_XLOAD, t), sp, 0); /* Load number value. */
goto doconv;
}
s = ctype_get(cts, sid);
doconv:
if (ctype_isenum(d->info)) d = ctype_child(cts, d);
return crec_ct_ct(J, d, s, dp, sp, svisnz);
}
/* -- C data metamethods -------------------------------------------------- */
/* This would be rather difficult in FOLD, so do it here:
** (base+k)+(idx*sz)+ofs ==> (base+idx*sz)+(ofs+k)
** (base+(idx+k)*sz)+ofs ==> (base+idx*sz)+(ofs+k*sz)
*/
static TRef crec_reassoc_ofs(jit_State *J, TRef tr, ptrdiff_t *ofsp, MSize sz)
{
IRIns *ir = IR(tref_ref(tr));
if (LJ_LIKELY(J->flags & JIT_F_OPT_FOLD) && irref_isk(ir->op2) &&
(ir->o == IR_ADD || ir->o == IR_ADDOV || ir->o == IR_SUBOV)) {
IRIns *irk = IR(ir->op2);
ptrdiff_t k;
if (LJ_64 && irk->o == IR_KINT64)
k = (ptrdiff_t)ir_kint64(irk)->u64 * sz;
else
k = (ptrdiff_t)irk->i * sz;
if (ir->o == IR_SUBOV) *ofsp -= k; else *ofsp += k;
tr = ir->op1; /* Not a TRef, but the caller doesn't care. */
}
return tr;
}
/* Record ctype __index/__newindex metamethods. */
static void crec_index_meta(jit_State *J, CTState *cts, CType *ct,
RecordFFData *rd)
{
CTypeID id = ctype_typeid(cts, ct);
cTValue *tv = lj_ctype_meta(cts, id, rd->data ? MM_newindex : MM_index);
if (!tv)
lj_trace_err(J, LJ_TRERR_BADTYPE);
if (tvisfunc(tv)) {
J->base[-1] = lj_ir_kfunc(J, funcV(tv)) | TREF_FRAME;
rd->nres = -1; /* Pending tailcall. */
} else if (rd->data == 0 && tvistab(tv) && tref_isstr(J->base[1])) {
/* Specialize to result of __index lookup. */
cTValue *o = lj_tab_get(J->L, tabV(tv), &rd->argv[1]);
J->base[0] = lj_record_constify(J, o);
if (!J->base[0])
lj_trace_err(J, LJ_TRERR_BADTYPE);
/* Always specialize to the key. */
emitir(IRTG(IR_EQ, IRT_STR), J->base[1], lj_ir_kstr(J, strV(&rd->argv[1])));
} else {
/* NYI: resolving of non-function metamethods. */
/* NYI: non-string keys for __index table. */
/* NYI: stores to __newindex table. */
lj_trace_err(J, LJ_TRERR_BADTYPE);
}
}
void LJ_FASTCALL recff_cdata_index(jit_State *J, RecordFFData *rd)
{
TRef idx, ptr = J->base[0];
ptrdiff_t ofs = sizeof(GCcdata);
GCcdata *cd = argv2cdata(J, ptr, &rd->argv[0]);
CTState *cts = ctype_ctsG(J2G(J));
CType *ct = ctype_raw(cts, cd->ctypeid);
CTypeID sid = 0;
/* Resolve pointer or reference for cdata object. */
if (ctype_isptr(ct->info)) {
IRType t = (LJ_64 && ct->size == 8) ? IRT_P64 : IRT_P32;
if (ctype_isref(ct->info)) ct = ctype_rawchild(cts, ct);
ptr = emitir(IRT(IR_FLOAD, t), ptr, IRFL_CDATA_PTR);
ofs = 0;
ptr = crec_reassoc_ofs(J, ptr, &ofs, 1);
}
again:
idx = J->base[1];
if (tref_isnumber(idx)) {
idx = lj_opt_narrow_cindex(J, idx);
if (ctype_ispointer(ct->info)) {
CTSize sz;
integer_key:
if ((ct->info & CTF_COMPLEX))
idx = emitir(IRT(IR_BAND, IRT_INTP), idx, lj_ir_kintp(J, 1));
sz = lj_ctype_size(cts, (sid = ctype_cid(ct->info)));
idx = crec_reassoc_ofs(J, idx, &ofs, sz);
#if LJ_TARGET_ARM || LJ_TARGET_PPC
/* Hoist base add to allow fusion of index/shift into operands. */
if (LJ_LIKELY(J->flags & JIT_F_OPT_LOOP) && ofs
#if LJ_TARGET_ARM
&& (sz == 1 || sz == 4)
#endif
) {
ptr = emitir(IRT(IR_ADD, IRT_PTR), ptr, lj_ir_kintp(J, ofs));
ofs = 0;
}
#endif
idx = emitir(IRT(IR_MUL, IRT_INTP), idx, lj_ir_kintp(J, sz));
ptr = emitir(IRT(IR_ADD, IRT_PTR), idx, ptr);
}
} else if (tref_iscdata(idx)) {
GCcdata *cdk = cdataV(&rd->argv[1]);
CType *ctk = ctype_raw(cts, cdk->ctypeid);
IRType t = crec_ct2irt(cts, ctk);
if (ctype_ispointer(ct->info) && t >= IRT_I8 && t <= IRT_U64) {
if (ctk->size == 8) {
idx = emitir(IRT(IR_FLOAD, t), idx, IRFL_CDATA_INT64);
} else if (ctk->size == 4) {
idx = emitir(IRT(IR_FLOAD, t), idx, IRFL_CDATA_INT);
} else {
idx = emitir(IRT(IR_ADD, IRT_PTR), idx,
lj_ir_kintp(J, sizeof(GCcdata)));
idx = emitir(IRT(IR_XLOAD, t), idx, 0);
}
if (LJ_64 && ctk->size < sizeof(intptr_t) && !(ctk->info & CTF_UNSIGNED))
idx = emitconv(idx, IRT_INTP, IRT_INT, IRCONV_SEXT);
if (!LJ_64 && ctk->size > sizeof(intptr_t)) {
idx = emitconv(idx, IRT_INTP, t, 0);
lj_needsplit(J);
}
goto integer_key;
}
} else if (tref_isstr(idx)) {
GCstr *name = strV(&rd->argv[1]);
if (cd && cd->ctypeid == CTID_CTYPEID)
ct = ctype_raw(cts, crec_constructor(J, cd, ptr));
if (ctype_isstruct(ct->info)) {
CTSize fofs;
CType *fct;
fct = lj_ctype_getfield(cts, ct, name, &fofs);
if (fct) {
/* Always specialize to the field name. */
emitir(IRTG(IR_EQ, IRT_STR), idx, lj_ir_kstr(J, name));
if (ctype_isconstval(fct->info)) {
if (fct->size >= 0x80000000u &&
(ctype_child(cts, fct)->info & CTF_UNSIGNED)) {
J->base[0] = lj_ir_knum(J, (lua_Number)(uint32_t)fct->size);
return;
}
J->base[0] = lj_ir_kint(J, (int32_t)fct->size);
return; /* Interpreter will throw for newindex. */
} else if (ctype_isbitfield(fct->info)) {
lj_trace_err(J, LJ_TRERR_NYICONV);
} else {
lua_assert(ctype_isfield(fct->info));
sid = ctype_cid(fct->info);
}
ofs += (ptrdiff_t)fofs;
}
} else if (ctype_iscomplex(ct->info)) {
if (name->len == 2 &&
((strdata(name)[0] == 'r' && strdata(name)[1] == 'e') ||
(strdata(name)[0] == 'i' && strdata(name)[1] == 'm'))) {
/* Always specialize to the field name. */
emitir(IRTG(IR_EQ, IRT_STR), idx, lj_ir_kstr(J, name));
if (strdata(name)[0] == 'i') ofs += (ct->size >> 1);
sid = ctype_cid(ct->info);
}
}
}
if (!sid) {
if (ctype_isptr(ct->info)) { /* Automatically perform '->'. */
CType *cct = ctype_rawchild(cts, ct);
if (ctype_isstruct(cct->info)) {
ct = cct;
cd = NULL;
if (tref_isstr(idx)) goto again;
}
}
crec_index_meta(J, cts, ct, rd);
return;
}
if (ofs)
ptr = emitir(IRT(IR_ADD, IRT_PTR), ptr, lj_ir_kintp(J, ofs));
/* Resolve reference for field. */
ct = ctype_get(cts, sid);
if (ctype_isref(ct->info)) {
ptr = emitir(IRT(IR_XLOAD, IRT_PTR), ptr, 0);
sid = ctype_cid(ct->info);
ct = ctype_get(cts, sid);
}
while (ctype_isattrib(ct->info))
ct = ctype_child(cts, ct); /* Skip attributes. */
if (rd->data == 0) { /* __index metamethod. */
J->base[0] = crec_tv_ct(J, ct, sid, ptr);
} else { /* __newindex metamethod. */
rd->nres = 0;
J->needsnap = 1;
crec_ct_tv(J, ct, ptr, J->base[2], &rd->argv[2]);
}
}
/* Record setting a finalizer. */
static void crec_finalizer(jit_State *J, TRef trcd, cTValue *fin)
{
TRef trlo = lj_ir_call(J, IRCALL_lj_cdata_setfin, trcd);
TRef trhi = emitir(IRT(IR_ADD, IRT_P32), trlo, lj_ir_kint(J, 4));
if (LJ_BE) { TRef tmp = trlo; trlo = trhi; trhi = tmp; }
if (tvisfunc(fin)) {
emitir(IRT(IR_XSTORE, IRT_P32), trlo, lj_ir_kfunc(J, funcV(fin)));
emitir(IRTI(IR_XSTORE), trhi, lj_ir_kint(J, LJ_TFUNC));
} else if (tviscdata(fin)) {
emitir(IRT(IR_XSTORE, IRT_P32), trlo,
lj_ir_kgc(J, obj2gco(cdataV(fin)), IRT_CDATA));
emitir(IRTI(IR_XSTORE), trhi, lj_ir_kint(J, LJ_TCDATA));
} else {
lj_trace_err(J, LJ_TRERR_BADTYPE);
}
J->needsnap = 1;
}
/* Record cdata allocation. */
static void crec_alloc(jit_State *J, RecordFFData *rd, CTypeID id)
{
CTState *cts = ctype_ctsG(J2G(J));
CTSize sz;
CTInfo info = lj_ctype_info(cts, id, &sz);
CType *d = ctype_raw(cts, id);
TRef trid;
if (!sz || sz > 128 || (info & CTF_VLA) || ctype_align(info) > CT_MEMALIGN)
lj_trace_err(J, LJ_TRERR_NYICONV); /* NYI: large/special allocations. */
trid = lj_ir_kint(J, id);
/* Use special instruction to box pointer or 32/64 bit integer. */
if (ctype_isptr(info) || (ctype_isinteger(info) && (sz == 4 || sz == 8))) {
TRef sp = J->base[1] ? crec_ct_tv(J, d, 0, J->base[1], &rd->argv[1]) :
ctype_isptr(info) ? lj_ir_kptr(J, NULL) :
sz == 4 ? lj_ir_kint(J, 0) :
(lj_needsplit(J), lj_ir_kint64(J, 0));
J->base[0] = emitir(IRTG(IR_CNEWI, IRT_CDATA), trid, sp);
} else {
TRef trcd = emitir(IRTG(IR_CNEW, IRT_CDATA), trid, TREF_NIL);
cTValue *fin;
J->base[0] = trcd;
if (J->base[1] && !J->base[2] &&
!lj_cconv_multi_init(cts, d, &rd->argv[1])) {
goto single_init;
} else if (ctype_isarray(d->info)) {
CType *dc = ctype_rawchild(cts, d); /* Array element type. */
CTSize ofs, esize = dc->size;
TRef sp = 0;
TValue tv;
TValue *sval = &tv;
MSize i;
tv.u64 = 0;
if (!(ctype_isnum(dc->info) || ctype_isptr(dc->info)))
lj_trace_err(J, LJ_TRERR_NYICONV); /* NYI: init array of aggregates. */
for (i = 1, ofs = 0; ofs < sz; ofs += esize) {
TRef dp = emitir(IRT(IR_ADD, IRT_PTR), trcd,
lj_ir_kintp(J, ofs + sizeof(GCcdata)));
if (J->base[i]) {
sp = J->base[i];
sval = &rd->argv[i];
i++;
} else if (i != 2) {
sp = ctype_isnum(dc->info) ? lj_ir_kint(J, 0) : TREF_NIL;
}
crec_ct_tv(J, dc, dp, sp, sval);
}
} else if (ctype_isstruct(d->info)) {
CTypeID fid = d->sib;
MSize i = 1;
while (fid) {
CType *df = ctype_get(cts, fid);
fid = df->sib;
if (ctype_isfield(df->info)) {
CType *dc;
TRef sp, dp;
TValue tv;
TValue *sval = &tv;
setintV(&tv, 0);
if (!gcref(df->name)) continue; /* Ignore unnamed fields. */
dc = ctype_rawchild(cts, df); /* Field type. */
if (!(ctype_isnum(dc->info) || ctype_isptr(dc->info) ||
ctype_isenum(dc->info)))
lj_trace_err(J, LJ_TRERR_NYICONV); /* NYI: init aggregates. */
if (J->base[i]) {
sp = J->base[i];
sval = &rd->argv[i];
i++;
} else {
sp = ctype_isptr(dc->info) ? TREF_NIL : lj_ir_kint(J, 0);
}
dp = emitir(IRT(IR_ADD, IRT_PTR), trcd,
lj_ir_kintp(J, df->size + sizeof(GCcdata)));
crec_ct_tv(J, dc, dp, sp, sval);
} else if (!ctype_isconstval(df->info)) {
/* NYI: init bitfields and sub-structures. */
lj_trace_err(J, LJ_TRERR_NYICONV);
}
}
} else {
TRef dp;
single_init:
dp = emitir(IRT(IR_ADD, IRT_PTR), trcd, lj_ir_kintp(J, sizeof(GCcdata)));
if (J->base[1]) {
crec_ct_tv(J, d, dp, J->base[1], &rd->argv[1]);
} else {
TValue tv;
tv.u64 = 0;
crec_ct_tv(J, d, dp, lj_ir_kint(J, 0), &tv);
}
}
/* Handle __gc metamethod. */
fin = lj_ctype_meta(cts, id, MM_gc);
if (fin)
crec_finalizer(J, trcd, fin);
}
}
/* Record argument conversions. */
static TRef crec_call_args(jit_State *J, RecordFFData *rd,
CTState *cts, CType *ct)
{
TRef args[CCI_NARGS_MAX];
CTypeID fid;
MSize i, n;
TRef tr, *base;
cTValue *o;
#if LJ_TARGET_X86
#if LJ_ABI_WIN
TRef *arg0 = NULL, *arg1 = NULL;
#endif
int ngpr = 0;
if (ctype_cconv(ct->info) == CTCC_THISCALL)
ngpr = 1;
else if (ctype_cconv(ct->info) == CTCC_FASTCALL)
ngpr = 2;
#endif
/* Skip initial attributes. */
fid = ct->sib;
while (fid) {
CType *ctf = ctype_get(cts, fid);
if (!ctype_isattrib(ctf->info)) break;
fid = ctf->sib;
}
args[0] = TREF_NIL;
for (n = 0, base = J->base+1, o = rd->argv+1; *base; n++, base++, o++) {
CTypeID did;
CType *d;
if (n >= CCI_NARGS_MAX)
lj_trace_err(J, LJ_TRERR_NYICALL);
if (fid) { /* Get argument type from field. */
CType *ctf = ctype_get(cts, fid);
fid = ctf->sib;
lua_assert(ctype_isfield(ctf->info));
did = ctype_cid(ctf->info);
} else {
if (!(ct->info & CTF_VARARG))
lj_trace_err(J, LJ_TRERR_NYICALL); /* Too many arguments. */
did = lj_ccall_ctid_vararg(cts, o); /* Infer vararg type. */
}
d = ctype_raw(cts, did);
if (!(ctype_isnum(d->info) || ctype_isptr(d->info) ||
ctype_isenum(d->info)))
lj_trace_err(J, LJ_TRERR_NYICALL);
tr = crec_ct_tv(J, d, 0, *base, o);
if (ctype_isinteger_or_bool(d->info)) {
if (d->size < 4) {
if ((d->info & CTF_UNSIGNED))
tr = emitconv(tr, IRT_INT, d->size==1 ? IRT_U8 : IRT_U16, 0);
else
tr = emitconv(tr, IRT_INT, d->size==1 ? IRT_I8 : IRT_I16,IRCONV_SEXT);
}
} else if (LJ_SOFTFP && ctype_isfp(d->info) && d->size > 4) {
lj_needsplit(J);
}
#if LJ_TARGET_X86
/* 64 bit args must not end up in registers for fastcall/thiscall. */
#if LJ_ABI_WIN
if (!ctype_isfp(d->info)) {
/* Sigh, the Windows/x86 ABI allows reordering across 64 bit args. */
if (tref_typerange(tr, IRT_I64, IRT_U64)) {
if (ngpr) {
arg0 = &args[n]; args[n++] = TREF_NIL; ngpr--;
if (ngpr) {
arg1 = &args[n]; args[n++] = TREF_NIL; ngpr--;
}
}
} else {
if (arg0) { *arg0 = tr; arg0 = NULL; n--; continue; }
if (arg1) { *arg1 = tr; arg1 = NULL; n--; continue; }
if (ngpr) ngpr--;
}
}
#else
if (!ctype_isfp(d->info) && ngpr) {
if (tref_typerange(tr, IRT_I64, IRT_U64)) {
/* No reordering for other x86 ABIs. Simply add alignment args. */
do { args[n++] = TREF_NIL; } while (--ngpr);
} else {
ngpr--;
}
}
#endif
#endif
args[n] = tr;
}
tr = args[0];
for (i = 1; i < n; i++)
tr = emitir(IRT(IR_CARG, IRT_NIL), tr, args[i]);
return tr;
}
/* Create a snapshot for the caller, simulating a 'false' return value. */
static void crec_snap_caller(jit_State *J)
{
lua_State *L = J->L;
TValue *base = L->base, *top = L->top;
const BCIns *pc = J->pc;
TRef ftr = J->base[-1];
ptrdiff_t delta;
if (!frame_islua(base-1) || J->framedepth <= 0)
lj_trace_err(J, LJ_TRERR_NYICALL);
J->pc = frame_pc(base-1); delta = 1+bc_a(J->pc[-1]);
L->top = base; L->base = base - delta;
J->base[-1] = TREF_FALSE;
J->base -= delta; J->baseslot -= (BCReg)delta;
J->maxslot = (BCReg)delta; J->framedepth--;
lj_snap_add(J);
L->base = base; L->top = top;
J->framedepth++; J->maxslot = 1;
J->base += delta; J->baseslot += (BCReg)delta;
J->base[-1] = ftr; J->pc = pc;
}
/* Record function call. */
static int crec_call(jit_State *J, RecordFFData *rd, GCcdata *cd)
{
CTState *cts = ctype_ctsG(J2G(J));
CType *ct = ctype_raw(cts, cd->ctypeid);
IRType tp = IRT_PTR;
if (ctype_isptr(ct->info)) {
tp = (LJ_64 && ct->size == 8) ? IRT_P64 : IRT_P32;
ct = ctype_rawchild(cts, ct);
}
if (ctype_isfunc(ct->info)) {
TRef func = emitir(IRT(IR_FLOAD, tp), J->base[0], IRFL_CDATA_PTR);
CType *ctr = ctype_rawchild(cts, ct);
IRType t = crec_ct2irt(cts, ctr);
TRef tr;
TValue tv;
/* Check for blacklisted C functions that might call a callback. */
setlightudV(&tv,
cdata_getptr(cdataptr(cd), (LJ_64 && tp == IRT_P64) ? 8 : 4));
if (tvistrue(lj_tab_get(J->L, cts->miscmap, &tv)))
lj_trace_err(J, LJ_TRERR_BLACKL);
if (ctype_isvoid(ctr->info)) {
t = IRT_NIL;
rd->nres = 0;
} else if (!(ctype_isnum(ctr->info) || ctype_isptr(ctr->info) ||
ctype_isenum(ctr->info)) || t == IRT_CDATA) {
lj_trace_err(J, LJ_TRERR_NYICALL);
}
if ((ct->info & CTF_VARARG)
#if LJ_TARGET_X86
|| ctype_cconv(ct->info) != CTCC_CDECL
#endif
)
func = emitir(IRT(IR_CARG, IRT_NIL), func,
lj_ir_kint(J, ctype_typeid(cts, ct)));
tr = emitir(IRT(IR_CALLXS, t), crec_call_args(J, rd, cts, ct), func);
if (ctype_isbool(ctr->info)) {
if (frame_islua(J->L->base-1) && bc_b(frame_pc(J->L->base-1)[-1]) == 1) {
/* Don't check result if ignored. */
tr = TREF_NIL;
} else {
crec_snap_caller(J);
#if LJ_TARGET_X86ORX64
/* Note: only the x86/x64 backend supports U8 and only for EQ(tr, 0). */
lj_ir_set(J, IRTG(IR_NE, IRT_U8), tr, lj_ir_kint(J, 0));
#else
lj_ir_set(J, IRTGI(IR_NE), tr, lj_ir_kint(J, 0));
#endif
J->postproc = LJ_POST_FIXGUARDSNAP;
tr = TREF_TRUE;
}
} else if (t == IRT_PTR || (LJ_64 && t == IRT_P32) ||
t == IRT_I64 || t == IRT_U64 || ctype_isenum(ctr->info)) {
TRef trid = lj_ir_kint(J, ctype_cid(ct->info));
tr = emitir(IRTG(IR_CNEWI, IRT_CDATA), trid, tr);
if (t == IRT_I64 || t == IRT_U64) lj_needsplit(J);
} else if (t == IRT_FLOAT || t == IRT_U32) {
tr = emitconv(tr, IRT_NUM, t, 0);
} else if (t == IRT_I8 || t == IRT_I16) {
tr = emitconv(tr, IRT_INT, t, IRCONV_SEXT);
} else if (t == IRT_U8 || t == IRT_U16) {
tr = emitconv(tr, IRT_INT, t, 0);
}
J->base[0] = tr;
J->needsnap = 1;
return 1;
}
return 0;
}
void LJ_FASTCALL recff_cdata_call(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
GCcdata *cd = argv2cdata(J, J->base[0], &rd->argv[0]);
CTypeID id = cd->ctypeid;
CType *ct;
cTValue *tv;
MMS mm = MM_call;
if (id == CTID_CTYPEID) {
id = crec_constructor(J, cd, J->base[0]);
mm = MM_new;
} else if (crec_call(J, rd, cd)) {
return;
}
/* Record ctype __call/__new metamethod. */
ct = ctype_raw(cts, id);
tv = lj_ctype_meta(cts, ctype_isptr(ct->info) ? ctype_cid(ct->info) : id, mm);
if (tv) {
if (tvisfunc(tv)) {
J->base[-1] = lj_ir_kfunc(J, funcV(tv)) | TREF_FRAME;
rd->nres = -1; /* Pending tailcall. */
return;
}
} else if (mm == MM_new) {
crec_alloc(J, rd, id);
return;
}
/* No metamethod or NYI: non-function metamethods. */
lj_trace_err(J, LJ_TRERR_BADTYPE);
}
static TRef crec_arith_int64(jit_State *J, TRef *sp, CType **s, MMS mm)
{
if (sp[0] && sp[1] && ctype_isnum(s[0]->info) && ctype_isnum(s[1]->info)) {
IRType dt;
CTypeID id;
TRef tr;
MSize i;
IROp op;
lj_needsplit(J);
if (((s[0]->info & CTF_UNSIGNED) && s[0]->size == 8) ||
((s[1]->info & CTF_UNSIGNED) && s[1]->size == 8)) {
dt = IRT_U64; id = CTID_UINT64;
} else {
dt = IRT_I64; id = CTID_INT64;
if (mm < MM_add &&
!((s[0]->info | s[1]->info) & CTF_FP) &&
s[0]->size == 4 && s[1]->size == 4) { /* Try to narrow comparison. */
if (!((s[0]->info ^ s[1]->info) & CTF_UNSIGNED) ||
(tref_isk(sp[1]) && IR(tref_ref(sp[1]))->i >= 0)) {
dt = (s[0]->info & CTF_UNSIGNED) ? IRT_U32 : IRT_INT;
goto comp;
} else if (tref_isk(sp[0]) && IR(tref_ref(sp[0]))->i >= 0) {
dt = (s[1]->info & CTF_UNSIGNED) ? IRT_U32 : IRT_INT;
goto comp;
}
}
}
for (i = 0; i < 2; i++) {
IRType st = tref_type(sp[i]);
if (st == IRT_NUM || st == IRT_FLOAT)
sp[i] = emitconv(sp[i], dt, st, IRCONV_TRUNC|IRCONV_ANY);
else if (!(st == IRT_I64 || st == IRT_U64))
sp[i] = emitconv(sp[i], dt, IRT_INT,
(s[i]->info & CTF_UNSIGNED) ? 0 : IRCONV_SEXT);
}
if (mm < MM_add) {
comp:
/* Assume true comparison. Fixup and emit pending guard later. */
if (mm == MM_eq) {
op = IR_EQ;
} else {
op = mm == MM_lt ? IR_LT : IR_LE;
if (dt == IRT_U32 || dt == IRT_U64)
op += (IR_ULT-IR_LT);
}
lj_ir_set(J, IRTG(op, dt), sp[0], sp[1]);
J->postproc = LJ_POST_FIXGUARD;
return TREF_TRUE;
} else {
tr = emitir(IRT(mm+(int)IR_ADD-(int)MM_add, dt), sp[0], sp[1]);
}
return emitir(IRTG(IR_CNEWI, IRT_CDATA), lj_ir_kint(J, id), tr);
}
return 0;
}
static TRef crec_arith_ptr(jit_State *J, TRef *sp, CType **s, MMS mm)
{
CTState *cts = ctype_ctsG(J2G(J));
CType *ctp = s[0];
if (!(sp[0] && sp[1])) return 0;
if (ctype_isptr(ctp->info) || ctype_isrefarray(ctp->info)) {
if ((mm == MM_sub || mm == MM_eq || mm == MM_lt || mm == MM_le) &&
(ctype_isptr(s[1]->info) || ctype_isrefarray(s[1]->info))) {
if (mm == MM_sub) { /* Pointer difference. */
TRef tr;
CTSize sz = lj_ctype_size(cts, ctype_cid(ctp->info));
if (sz == 0 || (sz & (sz-1)) != 0)
return 0; /* NYI: integer division. */
tr = emitir(IRT(IR_SUB, IRT_INTP), sp[0], sp[1]);
tr = emitir(IRT(IR_BSAR, IRT_INTP), tr, lj_ir_kint(J, lj_fls(sz)));
#if LJ_64
tr = emitconv(tr, IRT_NUM, IRT_INTP, 0);
#endif
return tr;
} else { /* Pointer comparison (unsigned). */
/* Assume true comparison. Fixup and emit pending guard later. */
IROp op = mm == MM_eq ? IR_EQ : mm == MM_lt ? IR_ULT : IR_ULE;
lj_ir_set(J, IRTG(op, IRT_PTR), sp[0], sp[1]);
J->postproc = LJ_POST_FIXGUARD;
return TREF_TRUE;
}
}
if (!((mm == MM_add || mm == MM_sub) && ctype_isnum(s[1]->info)))
return 0;
} else if (mm == MM_add && ctype_isnum(ctp->info) &&
(ctype_isptr(s[1]->info) || ctype_isrefarray(s[1]->info))) {
TRef tr = sp[0]; sp[0] = sp[1]; sp[1] = tr; /* Swap pointer and index. */
ctp = s[1];
} else {
return 0;
}
{
TRef tr = sp[1];
IRType t = tref_type(tr);
CTSize sz = lj_ctype_size(cts, ctype_cid(ctp->info));
CTypeID id;
#if LJ_64
if (t == IRT_NUM || t == IRT_FLOAT)
tr = emitconv(tr, IRT_INTP, t, IRCONV_TRUNC|IRCONV_ANY);
else if (!(t == IRT_I64 || t == IRT_U64))
tr = emitconv(tr, IRT_INTP, IRT_INT,
((t - IRT_I8) & 1) ? 0 : IRCONV_SEXT);
#else
if (!tref_typerange(sp[1], IRT_I8, IRT_U32)) {
tr = emitconv(tr, IRT_INTP, t,
(t == IRT_NUM || t == IRT_FLOAT) ?
IRCONV_TRUNC|IRCONV_ANY : 0);
}
#endif
tr = emitir(IRT(IR_MUL, IRT_INTP), tr, lj_ir_kintp(J, sz));
tr = emitir(IRT(mm+(int)IR_ADD-(int)MM_add, IRT_PTR), sp[0], tr);
id = lj_ctype_intern(cts, CTINFO(CT_PTR, CTALIGN_PTR|ctype_cid(ctp->info)),
CTSIZE_PTR);
return emitir(IRTG(IR_CNEWI, IRT_CDATA), lj_ir_kint(J, id), tr);
}
}
/* Record ctype arithmetic metamethods. */
static TRef crec_arith_meta(jit_State *J, TRef *sp, CType **s, CTState *cts,
RecordFFData *rd)
{
cTValue *tv = NULL;
if (J->base[0]) {
if (tviscdata(&rd->argv[0])) {
CTypeID id = argv2cdata(J, J->base[0], &rd->argv[0])->ctypeid;
CType *ct = ctype_raw(cts, id);
if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
tv = lj_ctype_meta(cts, id, (MMS)rd->data);
}
if (!tv && J->base[1] && tviscdata(&rd->argv[1])) {
CTypeID id = argv2cdata(J, J->base[1], &rd->argv[1])->ctypeid;
CType *ct = ctype_raw(cts, id);
if (ctype_isptr(ct->info)) id = ctype_cid(ct->info);
tv = lj_ctype_meta(cts, id, (MMS)rd->data);
}
}
if (tv) {
if (tvisfunc(tv)) {
J->base[-1] = lj_ir_kfunc(J, funcV(tv)) | TREF_FRAME;
rd->nres = -1; /* Pending tailcall. */
return 0;
} /* NYI: non-function metamethods. */
} else if ((MMS)rd->data == MM_eq) { /* Fallback cdata pointer comparison. */
if (sp[0] && sp[1] && ctype_isnum(s[0]->info) == ctype_isnum(s[1]->info)) {
/* Assume true comparison. Fixup and emit pending guard later. */
lj_ir_set(J, IRTG(IR_EQ, IRT_PTR), sp[0], sp[1]);
J->postproc = LJ_POST_FIXGUARD;
return TREF_TRUE;
} else {
return TREF_FALSE;
}
}
lj_trace_err(J, LJ_TRERR_BADTYPE);
return 0;
}
void LJ_FASTCALL recff_cdata_arith(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
TRef sp[2];
CType *s[2];
MSize i;
for (i = 0; i < 2; i++) {
TRef tr = J->base[i];
CType *ct = ctype_get(cts, CTID_DOUBLE);
if (!tr) {
lj_trace_err(J, LJ_TRERR_BADTYPE);
} else if (tref_iscdata(tr)) {
CTypeID id = argv2cdata(J, tr, &rd->argv[i])->ctypeid;
IRType t;
ct = ctype_raw(cts, id);
t = crec_ct2irt(cts, ct);
if (ctype_isptr(ct->info)) { /* Resolve pointer or reference. */
tr = emitir(IRT(IR_FLOAD, t), tr, IRFL_CDATA_PTR);
if (ctype_isref(ct->info)) {
ct = ctype_rawchild(cts, ct);
t = crec_ct2irt(cts, ct);
}
} else if (t == IRT_I64 || t == IRT_U64) {
tr = emitir(IRT(IR_FLOAD, t), tr, IRFL_CDATA_INT64);
lj_needsplit(J);
goto ok;
} else if (t == IRT_INT || t == IRT_U32) {
tr = emitir(IRT(IR_FLOAD, t), tr, IRFL_CDATA_INT);
if (ctype_isenum(ct->info)) ct = ctype_child(cts, ct);
goto ok;
} else if (ctype_isfunc(ct->info)) {
tr = emitir(IRT(IR_FLOAD, IRT_PTR), tr, IRFL_CDATA_PTR);
ct = ctype_get(cts,
lj_ctype_intern(cts, CTINFO(CT_PTR, CTALIGN_PTR|id), CTSIZE_PTR));
goto ok;
} else {
tr = emitir(IRT(IR_ADD, IRT_PTR), tr, lj_ir_kintp(J, sizeof(GCcdata)));
}
if (ctype_isenum(ct->info)) ct = ctype_child(cts, ct);
if (ctype_isnum(ct->info)) {
if (t == IRT_CDATA) {
tr = 0;
} else {
if (t == IRT_I64 || t == IRT_U64) lj_needsplit(J);
tr = emitir(IRT(IR_XLOAD, t), tr, 0);
}
}
} else if (tref_isnil(tr)) {
tr = lj_ir_kptr(J, NULL);
ct = ctype_get(cts, CTID_P_VOID);
} else if (tref_isinteger(tr)) {
ct = ctype_get(cts, CTID_INT32);
} else if (tref_isstr(tr)) {
TRef tr2 = J->base[1-i];
CTypeID id = argv2cdata(J, tr2, &rd->argv[1-i])->ctypeid;
ct = ctype_raw(cts, id);
if (ctype_isenum(ct->info)) { /* Match string against enum constant. */
GCstr *str = strV(&rd->argv[i]);
CTSize ofs;
CType *cct = lj_ctype_getfield(cts, ct, str, &ofs);
if (cct && ctype_isconstval(cct->info)) {
/* Specialize to the name of the enum constant. */
emitir(IRTG(IR_EQ, IRT_STR), tr, lj_ir_kstr(J, str));
ct = ctype_child(cts, cct);
tr = lj_ir_kint(J, (int32_t)ofs);
} else { /* Interpreter will throw or return false. */
ct = ctype_get(cts, CTID_P_VOID);
}
} else if (ctype_isptr(ct->info)) {
tr = emitir(IRT(IR_ADD, IRT_PTR), tr, lj_ir_kintp(J, sizeof(GCstr)));
} else {
ct = ctype_get(cts, CTID_P_VOID);
}
} else if (!tref_isnum(tr)) {
tr = 0;
ct = ctype_get(cts, CTID_P_VOID);
}
ok:
s[i] = ct;
sp[i] = tr;
}
{
TRef tr;
if (!(tr = crec_arith_int64(J, sp, s, (MMS)rd->data)) &&
!(tr = crec_arith_ptr(J, sp, s, (MMS)rd->data)) &&
!(tr = crec_arith_meta(J, sp, s, cts, rd)))
return;
J->base[0] = tr;
/* Fixup cdata comparisons, too. Avoids some cdata escapes. */
if (J->postproc == LJ_POST_FIXGUARD && frame_iscont(J->L->base-1) &&
!irt_isguard(J->guardemit)) {
const BCIns *pc = frame_contpc(J->L->base-1) - 1;
if (bc_op(*pc) <= BC_ISNEP) {
setframe_pc(&J2G(J)->tmptv, pc);
J2G(J)->tmptv.u32.lo = ((tref_istrue(tr) ^ bc_op(*pc)) & 1);
J->postproc = LJ_POST_FIXCOMP;
}
}
}
}
/* -- C library namespace metamethods ------------------------------------- */
void LJ_FASTCALL recff_clib_index(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
if (tref_isudata(J->base[0]) && tref_isstr(J->base[1]) &&
udataV(&rd->argv[0])->udtype == UDTYPE_FFI_CLIB) {
CLibrary *cl = (CLibrary *)uddata(udataV(&rd->argv[0]));
GCstr *name = strV(&rd->argv[1]);
CType *ct;
CTypeID id = lj_ctype_getname(cts, &ct, name, CLNS_INDEX);
cTValue *tv = lj_tab_getstr(cl->cache, name);
rd->nres = rd->data;
if (id && tv && !tvisnil(tv)) {
/* Specialize to the symbol name and make the result a constant. */
emitir(IRTG(IR_EQ, IRT_STR), J->base[1], lj_ir_kstr(J, name));
if (ctype_isconstval(ct->info)) {
if (ct->size >= 0x80000000u &&
(ctype_child(cts, ct)->info & CTF_UNSIGNED))
J->base[0] = lj_ir_knum(J, (lua_Number)(uint32_t)ct->size);
else
J->base[0] = lj_ir_kint(J, (int32_t)ct->size);
} else if (ctype_isextern(ct->info)) {
CTypeID sid = ctype_cid(ct->info);
void *sp = *(void **)cdataptr(cdataV(tv));
TRef ptr;
ct = ctype_raw(cts, sid);
if (LJ_64 && !checkptr32(sp))
ptr = lj_ir_kintp(J, (uintptr_t)sp);
else
ptr = lj_ir_kptr(J, sp);
if (rd->data) {
J->base[0] = crec_tv_ct(J, ct, sid, ptr);
} else {
J->needsnap = 1;
crec_ct_tv(J, ct, ptr, J->base[2], &rd->argv[2]);
}
} else {
J->base[0] = lj_ir_kgc(J, obj2gco(cdataV(tv)), IRT_CDATA);
}
} else {
lj_trace_err(J, LJ_TRERR_NOCACHE);
}
} /* else: interpreter will throw. */
}
/* -- FFI library functions ----------------------------------------------- */
static TRef crec_toint(jit_State *J, CTState *cts, TRef sp, TValue *sval)
{
return crec_ct_tv(J, ctype_get(cts, CTID_INT32), 0, sp, sval);
}
void LJ_FASTCALL recff_ffi_new(jit_State *J, RecordFFData *rd)
{
crec_alloc(J, rd, argv2ctype(J, J->base[0], &rd->argv[0]));
}
void LJ_FASTCALL recff_ffi_errno(jit_State *J, RecordFFData *rd)
{
UNUSED(rd);
if (J->base[0])
lj_trace_err(J, LJ_TRERR_NYICALL);
J->base[0] = lj_ir_call(J, IRCALL_lj_vm_errno);
}
void LJ_FASTCALL recff_ffi_string(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
TRef tr = J->base[0];
if (tr) {
TRef trlen = J->base[1];
if (!tref_isnil(trlen)) {
trlen = crec_toint(J, cts, trlen, &rd->argv[1]);
tr = crec_ct_tv(J, ctype_get(cts, CTID_P_CVOID), 0, tr, &rd->argv[0]);
} else {
tr = crec_ct_tv(J, ctype_get(cts, CTID_P_CCHAR), 0, tr, &rd->argv[0]);
trlen = lj_ir_call(J, IRCALL_strlen, tr);
}
J->base[0] = emitir(IRT(IR_XSNEW, IRT_STR), tr, trlen);
} /* else: interpreter will throw. */
}
void LJ_FASTCALL recff_ffi_copy(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
TRef trdst = J->base[0], trsrc = J->base[1], trlen = J->base[2];
if (trdst && trsrc && (trlen || tref_isstr(trsrc))) {
trdst = crec_ct_tv(J, ctype_get(cts, CTID_P_VOID), 0, trdst, &rd->argv[0]);
trsrc = crec_ct_tv(J, ctype_get(cts, CTID_P_CVOID), 0, trsrc, &rd->argv[1]);
if (trlen) {
trlen = crec_toint(J, cts, trlen, &rd->argv[2]);
} else {
trlen = emitir(IRTI(IR_FLOAD), J->base[1], IRFL_STR_LEN);
trlen = emitir(IRTI(IR_ADD), trlen, lj_ir_kint(J, 1));
}
rd->nres = 0;
crec_copy(J, trdst, trsrc, trlen, NULL);
} /* else: interpreter will throw. */
}
void LJ_FASTCALL recff_ffi_fill(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
TRef trdst = J->base[0], trlen = J->base[1], trfill = J->base[2];
if (trdst && trlen) {
CTSize step = 1;
if (tviscdata(&rd->argv[0])) { /* Get alignment of original destination. */
CTSize sz;
CType *ct = ctype_raw(cts, cdataV(&rd->argv[0])->ctypeid);
if (ctype_isptr(ct->info))
ct = ctype_rawchild(cts, ct);
step = (1u<<ctype_align(lj_ctype_info(cts, ctype_typeid(cts, ct), &sz)));
}
trdst = crec_ct_tv(J, ctype_get(cts, CTID_P_VOID), 0, trdst, &rd->argv[0]);
trlen = crec_toint(J, cts, trlen, &rd->argv[1]);
if (trfill)
trfill = crec_toint(J, cts, trfill, &rd->argv[2]);
else
trfill = lj_ir_kint(J, 0);
rd->nres = 0;
crec_fill(J, trdst, trlen, trfill, step);
} /* else: interpreter will throw. */
}
void LJ_FASTCALL recff_ffi_typeof(jit_State *J, RecordFFData *rd)
{
if (tref_iscdata(J->base[0])) {
TRef trid = lj_ir_kint(J, argv2ctype(J, J->base[0], &rd->argv[0]));
J->base[0] = emitir(IRTG(IR_CNEWI, IRT_CDATA),
lj_ir_kint(J, CTID_CTYPEID), trid);
} else {
setfuncV(J->L, &J->errinfo, J->fn);
lj_trace_err_info(J, LJ_TRERR_NYIFFU);
}
}
void LJ_FASTCALL recff_ffi_istype(jit_State *J, RecordFFData *rd)
{
argv2ctype(J, J->base[0], &rd->argv[0]);
if (tref_iscdata(J->base[1])) {
argv2ctype(J, J->base[1], &rd->argv[1]);
J->postproc = LJ_POST_FIXBOOL;
J->base[0] = TREF_TRUE;
} else {
J->base[0] = TREF_FALSE;
}
}
void LJ_FASTCALL recff_ffi_abi(jit_State *J, RecordFFData *rd)
{
if (tref_isstr(J->base[0])) {
/* Specialize to the ABI string to make the boolean result a constant. */
emitir(IRTG(IR_EQ, IRT_STR), J->base[0], lj_ir_kstr(J, strV(&rd->argv[0])));
J->postproc = LJ_POST_FIXBOOL;
J->base[0] = TREF_TRUE;
} else {
lj_trace_err(J, LJ_TRERR_BADTYPE);
}
}
/* Record ffi.sizeof(), ffi.alignof(), ffi.offsetof(). */
void LJ_FASTCALL recff_ffi_xof(jit_State *J, RecordFFData *rd)
{
CTypeID id = argv2ctype(J, J->base[0], &rd->argv[0]);
if (rd->data == FF_ffi_sizeof) {
CType *ct = lj_ctype_rawref(ctype_ctsG(J2G(J)), id);
if (ctype_isvltype(ct->info))
lj_trace_err(J, LJ_TRERR_BADTYPE);
} else if (rd->data == FF_ffi_offsetof) { /* Specialize to the field name. */
if (!tref_isstr(J->base[1]))
lj_trace_err(J, LJ_TRERR_BADTYPE);
emitir(IRTG(IR_EQ, IRT_STR), J->base[1], lj_ir_kstr(J, strV(&rd->argv[1])));
rd->nres = 3; /* Just in case. */
}
J->postproc = LJ_POST_FIXCONST;
J->base[0] = J->base[1] = J->base[2] = TREF_NIL;
}
void LJ_FASTCALL recff_ffi_gc(jit_State *J, RecordFFData *rd)
{
argv2cdata(J, J->base[0], &rd->argv[0]);
crec_finalizer(J, J->base[0], &rd->argv[1]);
}
/* -- Miscellaneous library functions ------------------------------------- */
void LJ_FASTCALL lj_crecord_tonumber(jit_State *J, RecordFFData *rd)
{
CTState *cts = ctype_ctsG(J2G(J));
CType *d, *ct = lj_ctype_rawref(cts, cdataV(&rd->argv[0])->ctypeid);
if (ctype_isenum(ct->info)) ct = ctype_child(cts, ct);
if (ctype_isnum(ct->info) || ctype_iscomplex(ct->info)) {
if (ctype_isinteger_or_bool(ct->info) && ct->size <= 4 &&
!(ct->size == 4 && (ct->info & CTF_UNSIGNED)))
d = ctype_get(cts, CTID_INT32);
else
d = ctype_get(cts, CTID_DOUBLE);
J->base[0] = crec_ct_tv(J, d, 0, J->base[0], &rd->argv[0]);
} else {
J->base[0] = TREF_NIL;
}
}
#undef IR
#undef emitir
#undef emitconv
#endif
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