summaryrefslogtreecommitdiff
path: root/Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c
diff options
context:
space:
mode:
authorAkira Kakuto <kakuto@fuk.kindai.ac.jp>2016-02-18 15:19:40 +0000
committerAkira Kakuto <kakuto@fuk.kindai.ac.jp>2016-02-18 15:19:40 +0000
commitbad5df60cd53f774b59edd997ec3ff30fba67cac (patch)
treefa7866ca8ea7529beb61a5b4a446302a50dd617b /Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c
parent6c4ba6b7612a1bfdf20246a22c71e0640471807b (diff)
libs/luajit: New convention
git-svn-id: svn://tug.org/texlive/trunk@39765 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c')
-rw-r--r--Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c752
1 files changed, 0 insertions, 752 deletions
diff --git a/Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c b/Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c
deleted file mode 100644
index 8a270766fb9..00000000000
--- a/Build/source/libs/luajit/LuaJIT-2.1.0-beta1/src/lj_cconv.c
+++ /dev/null
@@ -1,752 +0,0 @@
-/*
-** C type conversions.
-** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
-*/
-
-#include "lj_obj.h"
-
-#if LJ_HASFFI
-
-#include "lj_err.h"
-#include "lj_tab.h"
-#include "lj_ctype.h"
-#include "lj_cdata.h"
-#include "lj_cconv.h"
-#include "lj_ccallback.h"
-
-/* -- Conversion errors --------------------------------------------------- */
-
-/* Bad conversion. */
-LJ_NORET static void cconv_err_conv(CTState *cts, CType *d, CType *s,
- CTInfo flags)
-{
- const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
- const char *src;
- if ((flags & CCF_FROMTV))
- src = lj_obj_typename[1+(ctype_isnum(s->info) ? LUA_TNUMBER :
- ctype_isarray(s->info) ? LUA_TSTRING : LUA_TNIL)];
- else
- src = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, s), NULL));
- if (CCF_GETARG(flags))
- lj_err_argv(cts->L, CCF_GETARG(flags), LJ_ERR_FFI_BADCONV, src, dst);
- else
- lj_err_callerv(cts->L, LJ_ERR_FFI_BADCONV, src, dst);
-}
-
-/* Bad conversion from TValue. */
-LJ_NORET static void cconv_err_convtv(CTState *cts, CType *d, TValue *o,
- CTInfo flags)
-{
- const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
- const char *src = lj_typename(o);
- if (CCF_GETARG(flags))
- lj_err_argv(cts->L, CCF_GETARG(flags), LJ_ERR_FFI_BADCONV, src, dst);
- else
- lj_err_callerv(cts->L, LJ_ERR_FFI_BADCONV, src, dst);
-}
-
-/* Initializer overflow. */
-LJ_NORET static void cconv_err_initov(CTState *cts, CType *d)
-{
- const char *dst = strdata(lj_ctype_repr(cts->L, ctype_typeid(cts, d), NULL));
- lj_err_callerv(cts->L, LJ_ERR_FFI_INITOV, dst);
-}
-
-/* -- C type compatibility checks ----------------------------------------- */
-
-/* Get raw type and qualifiers for a child type. Resolves enums, too. */
-static CType *cconv_childqual(CTState *cts, CType *ct, CTInfo *qual)
-{
- ct = ctype_child(cts, ct);
- for (;;) {
- if (ctype_isattrib(ct->info)) {
- if (ctype_attrib(ct->info) == CTA_QUAL) *qual |= ct->size;
- } else if (!ctype_isenum(ct->info)) {
- break;
- }
- ct = ctype_child(cts, ct);
- }
- *qual |= (ct->info & CTF_QUAL);
- return ct;
-}
-
-/* Check for compatible types when converting to a pointer.
-** Note: these checks are more relaxed than what C99 mandates.
-*/
-int lj_cconv_compatptr(CTState *cts, CType *d, CType *s, CTInfo flags)
-{
- if (!((flags & CCF_CAST) || d == s)) {
- CTInfo dqual = 0, squal = 0;
- d = cconv_childqual(cts, d, &dqual);
- if (!ctype_isstruct(s->info))
- s = cconv_childqual(cts, s, &squal);
- if ((flags & CCF_SAME)) {
- if (dqual != squal)
- return 0; /* Different qualifiers. */
- } else if (!(flags & CCF_IGNQUAL)) {
- if ((dqual & squal) != squal)
- return 0; /* Discarded qualifiers. */
- if (ctype_isvoid(d->info) || ctype_isvoid(s->info))
- return 1; /* Converting to/from void * is always ok. */
- }
- if (ctype_type(d->info) != ctype_type(s->info) ||
- d->size != s->size)
- return 0; /* Different type or different size. */
- if (ctype_isnum(d->info)) {
- if (((d->info ^ s->info) & (CTF_BOOL|CTF_FP)))
- return 0; /* Different numeric types. */
- } else if (ctype_ispointer(d->info)) {
- /* Check child types for compatibility. */
- return lj_cconv_compatptr(cts, d, s, flags|CCF_SAME);
- } else if (ctype_isstruct(d->info)) {
- if (d != s)
- return 0; /* Must be exact same type for struct/union. */
- } else if (ctype_isfunc(d->info)) {
- /* NYI: structural equality of functions. */
- }
- }
- return 1; /* Types are compatible. */
-}
-
-/* -- C type to C type conversion ----------------------------------------- */
-
-/* Convert C type to C type. Caveat: expects to get the raw CType!
-**
-** Note: This is only used by the interpreter and not optimized at all.
-** The JIT compiler will do a much better job specializing for each case.
-*/
-void lj_cconv_ct_ct(CTState *cts, CType *d, CType *s,
- uint8_t *dp, uint8_t *sp, CTInfo flags)
-{
- CTSize dsize = d->size, ssize = s->size;
- CTInfo dinfo = d->info, sinfo = s->info;
- void *tmpptr;
-
- lua_assert(!ctype_isenum(dinfo) && !ctype_isenum(sinfo));
- lua_assert(!ctype_isattrib(dinfo) && !ctype_isattrib(sinfo));
-
- if (ctype_type(dinfo) > CT_MAYCONVERT || ctype_type(sinfo) > CT_MAYCONVERT)
- goto err_conv;
-
- /* Some basic sanity checks. */
- lua_assert(!ctype_isnum(dinfo) || dsize > 0);
- lua_assert(!ctype_isnum(sinfo) || ssize > 0);
- lua_assert(!ctype_isbool(dinfo) || dsize == 1 || dsize == 4);
- lua_assert(!ctype_isbool(sinfo) || ssize == 1 || ssize == 4);
- lua_assert(!ctype_isinteger(dinfo) || (1u<<lj_fls(dsize)) == dsize);
- lua_assert(!ctype_isinteger(sinfo) || (1u<<lj_fls(ssize)) == ssize);
-
- switch (cconv_idx2(dinfo, sinfo)) {
- /* Destination is a bool. */
- case CCX(B, B):
- /* Source operand is already normalized. */
- if (dsize == 1) *dp = *sp; else *(int *)dp = *sp;
- break;
- case CCX(B, I): {
- MSize i;
- uint8_t b = 0;
- for (i = 0; i < ssize; i++) b |= sp[i];
- b = (b != 0);
- if (dsize == 1) *dp = b; else *(int *)dp = b;
- break;
- }
- case CCX(B, F): {
- uint8_t b;
- if (ssize == sizeof(double)) b = (*(double *)sp != 0);
- else if (ssize == sizeof(float)) b = (*(float *)sp != 0);
- else goto err_conv; /* NYI: long double. */
- if (dsize == 1) *dp = b; else *(int *)dp = b;
- break;
- }
-
- /* Destination is an integer. */
- case CCX(I, B):
- case CCX(I, I):
- conv_I_I:
- if (dsize > ssize) { /* Zero-extend or sign-extend LSB. */
-#if LJ_LE
- uint8_t fill = (!(sinfo & CTF_UNSIGNED) && (sp[ssize-1]&0x80)) ? 0xff : 0;
- memcpy(dp, sp, ssize);
- memset(dp + ssize, fill, dsize-ssize);
-#else
- uint8_t fill = (!(sinfo & CTF_UNSIGNED) && (sp[0]&0x80)) ? 0xff : 0;
- memset(dp, fill, dsize-ssize);
- memcpy(dp + (dsize-ssize), sp, ssize);
-#endif
- } else { /* Copy LSB. */
-#if LJ_LE
- memcpy(dp, sp, dsize);
-#else
- memcpy(dp, sp + (ssize-dsize), dsize);
-#endif
- }
- break;
- case CCX(I, F): {
- double n; /* Always convert via double. */
- conv_I_F:
- /* Convert source to double. */
- if (ssize == sizeof(double)) n = *(double *)sp;
- else if (ssize == sizeof(float)) n = (double)*(float *)sp;
- else goto err_conv; /* NYI: long double. */
- /* Then convert double to integer. */
- /* The conversion must exactly match the semantics of JIT-compiled code! */
- if (dsize < 4 || (dsize == 4 && !(dinfo & CTF_UNSIGNED))) {
- int32_t i = (int32_t)n;
- if (dsize == 4) *(int32_t *)dp = i;
- else if (dsize == 2) *(int16_t *)dp = (int16_t)i;
- else *(int8_t *)dp = (int8_t)i;
- } else if (dsize == 4) {
- *(uint32_t *)dp = (uint32_t)n;
- } else if (dsize == 8) {
- if (!(dinfo & CTF_UNSIGNED))
- *(int64_t *)dp = (int64_t)n;
- else
- *(uint64_t *)dp = lj_num2u64(n);
- } else {
- goto err_conv; /* NYI: conversion to >64 bit integers. */
- }
- break;
- }
- case CCX(I, C):
- s = ctype_child(cts, s);
- sinfo = s->info;
- ssize = s->size;
- goto conv_I_F; /* Just convert re. */
- case CCX(I, P):
- if (!(flags & CCF_CAST)) goto err_conv;
- sinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
- goto conv_I_I;
- case CCX(I, A):
- if (!(flags & CCF_CAST)) goto err_conv;
- sinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
- ssize = CTSIZE_PTR;
- tmpptr = sp;
- sp = (uint8_t *)&tmpptr;
- goto conv_I_I;
-
- /* Destination is a floating-point number. */
- case CCX(F, B):
- case CCX(F, I): {
- double n; /* Always convert via double. */
- conv_F_I:
- /* First convert source to double. */
- /* The conversion must exactly match the semantics of JIT-compiled code! */
- if (ssize < 4 || (ssize == 4 && !(sinfo & CTF_UNSIGNED))) {
- int32_t i;
- if (ssize == 4) {
- i = *(int32_t *)sp;
- } else if (!(sinfo & CTF_UNSIGNED)) {
- if (ssize == 2) i = *(int16_t *)sp;
- else i = *(int8_t *)sp;
- } else {
- if (ssize == 2) i = *(uint16_t *)sp;
- else i = *(uint8_t *)sp;
- }
- n = (double)i;
- } else if (ssize == 4) {
- n = (double)*(uint32_t *)sp;
- } else if (ssize == 8) {
- if (!(sinfo & CTF_UNSIGNED)) n = (double)*(int64_t *)sp;
- else n = (double)*(uint64_t *)sp;
- } else {
- goto err_conv; /* NYI: conversion from >64 bit integers. */
- }
- /* Convert double to destination. */
- if (dsize == sizeof(double)) *(double *)dp = n;
- else if (dsize == sizeof(float)) *(float *)dp = (float)n;
- else goto err_conv; /* NYI: long double. */
- break;
- }
- case CCX(F, F): {
- double n; /* Always convert via double. */
- conv_F_F:
- if (ssize == dsize) goto copyval;
- /* Convert source to double. */
- if (ssize == sizeof(double)) n = *(double *)sp;
- else if (ssize == sizeof(float)) n = (double)*(float *)sp;
- else goto err_conv; /* NYI: long double. */
- /* Convert double to destination. */
- if (dsize == sizeof(double)) *(double *)dp = n;
- else if (dsize == sizeof(float)) *(float *)dp = (float)n;
- else goto err_conv; /* NYI: long double. */
- break;
- }
- case CCX(F, C):
- s = ctype_child(cts, s);
- sinfo = s->info;
- ssize = s->size;
- goto conv_F_F; /* Ignore im, and convert from re. */
-
- /* Destination is a complex number. */
- case CCX(C, I):
- d = ctype_child(cts, d);
- dinfo = d->info;
- dsize = d->size;
- memset(dp + dsize, 0, dsize); /* Clear im. */
- goto conv_F_I; /* Convert to re. */
- case CCX(C, F):
- d = ctype_child(cts, d);
- dinfo = d->info;
- dsize = d->size;
- memset(dp + dsize, 0, dsize); /* Clear im. */
- goto conv_F_F; /* Convert to re. */
-
- case CCX(C, C):
- if (dsize != ssize) { /* Different types: convert re/im separately. */
- CType *dc = ctype_child(cts, d);
- CType *sc = ctype_child(cts, s);
- lj_cconv_ct_ct(cts, dc, sc, dp, sp, flags);
- lj_cconv_ct_ct(cts, dc, sc, dp + dc->size, sp + sc->size, flags);
- return;
- }
- goto copyval; /* Otherwise this is easy. */
-
- /* Destination is a vector. */
- case CCX(V, I):
- case CCX(V, F):
- case CCX(V, C): {
- CType *dc = ctype_child(cts, d);
- CTSize esize;
- /* First convert the scalar to the first element. */
- lj_cconv_ct_ct(cts, dc, s, dp, sp, flags);
- /* Then replicate it to the other elements (splat). */
- for (sp = dp, esize = dc->size; dsize > esize; dsize -= esize) {
- dp += esize;
- memcpy(dp, sp, esize);
- }
- break;
- }
-
- case CCX(V, V):
- /* Copy same-sized vectors, even for different lengths/element-types. */
- if (dsize != ssize) goto err_conv;
- goto copyval;
-
- /* Destination is a pointer. */
- case CCX(P, I):
- if (!(flags & CCF_CAST)) goto err_conv;
- dinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
- goto conv_I_I;
-
- case CCX(P, F):
- if (!(flags & CCF_CAST) || !(flags & CCF_FROMTV)) goto err_conv;
- /* The signed conversion is cheaper. x64 really has 47 bit pointers. */
- dinfo = CTINFO(CT_NUM, (LJ_64 && dsize == 8) ? 0 : CTF_UNSIGNED);
- goto conv_I_F;
-
- case CCX(P, P):
- if (!lj_cconv_compatptr(cts, d, s, flags)) goto err_conv;
- cdata_setptr(dp, dsize, cdata_getptr(sp, ssize));
- break;
-
- case CCX(P, A):
- case CCX(P, S):
- if (!lj_cconv_compatptr(cts, d, s, flags)) goto err_conv;
- cdata_setptr(dp, dsize, sp);
- break;
-
- /* Destination is an array. */
- case CCX(A, A):
- if ((flags & CCF_CAST) || (d->info & CTF_VLA) || dsize != ssize ||
- d->size == CTSIZE_INVALID || !lj_cconv_compatptr(cts, d, s, flags))
- goto err_conv;
- goto copyval;
-
- /* Destination is a struct/union. */
- case CCX(S, S):
- if ((flags & CCF_CAST) || (d->info & CTF_VLA) || d != s)
- goto err_conv; /* Must be exact same type. */
-copyval: /* Copy value. */
- lua_assert(dsize == ssize);
- memcpy(dp, sp, dsize);
- break;
-
- default:
- err_conv:
- cconv_err_conv(cts, d, s, flags);
- }
-}
-
-/* -- C type to TValue conversion ----------------------------------------- */
-
-/* Convert C type to TValue. Caveat: expects to get the raw CType! */
-int lj_cconv_tv_ct(CTState *cts, CType *s, CTypeID sid,
- TValue *o, uint8_t *sp)
-{
- CTInfo sinfo = s->info;
- if (ctype_isnum(sinfo)) {
- if (!ctype_isbool(sinfo)) {
- if (ctype_isinteger(sinfo) && s->size > 4) goto copyval;
- if (LJ_DUALNUM && ctype_isinteger(sinfo)) {
- int32_t i;
- lj_cconv_ct_ct(cts, ctype_get(cts, CTID_INT32), s,
- (uint8_t *)&i, sp, 0);
- if ((sinfo & CTF_UNSIGNED) && i < 0)
- setnumV(o, (lua_Number)(uint32_t)i);
- else
- setintV(o, i);
- } else {
- lj_cconv_ct_ct(cts, ctype_get(cts, CTID_DOUBLE), s,
- (uint8_t *)&o->n, sp, 0);
- /* Numbers are NOT canonicalized here! Beware of uninitialized data. */
- lua_assert(tvisnum(o));
- }
- } else {
- uint32_t b = s->size == 1 ? (*sp != 0) : (*(int *)sp != 0);
- setboolV(o, b);
- setboolV(&cts->g->tmptv2, b); /* Remember for trace recorder. */
- }
- return 0;
- } else if (ctype_isrefarray(sinfo) || ctype_isstruct(sinfo)) {
- /* Create reference. */
- setcdataV(cts->L, o, lj_cdata_newref(cts, sp, sid));
- return 1; /* Need GC step. */
- } else {
- GCcdata *cd;
- CTSize sz;
- copyval: /* Copy value. */
- sz = s->size;
- lua_assert(sz != CTSIZE_INVALID);
- /* Attributes are stripped, qualifiers are kept (but mostly ignored). */
- cd = lj_cdata_new(cts, ctype_typeid(cts, s), sz);
- setcdataV(cts->L, o, cd);
- memcpy(cdataptr(cd), sp, sz);
- return 1; /* Need GC step. */
- }
-}
-
-/* Convert bitfield to TValue. */
-int lj_cconv_tv_bf(CTState *cts, CType *s, TValue *o, uint8_t *sp)
-{
- CTInfo info = s->info;
- CTSize pos, bsz;
- uint32_t val;
- lua_assert(ctype_isbitfield(info));
- /* NYI: packed bitfields may cause misaligned reads. */
- switch (ctype_bitcsz(info)) {
- case 4: val = *(uint32_t *)sp; break;
- case 2: val = *(uint16_t *)sp; break;
- case 1: val = *(uint8_t *)sp; break;
- default: lua_assert(0); val = 0; break;
- }
- /* Check if a packed bitfield crosses a container boundary. */
- pos = ctype_bitpos(info);
- bsz = ctype_bitbsz(info);
- lua_assert(pos < 8*ctype_bitcsz(info));
- lua_assert(bsz > 0 && bsz <= 8*ctype_bitcsz(info));
- if (pos + bsz > 8*ctype_bitcsz(info))
- lj_err_caller(cts->L, LJ_ERR_FFI_NYIPACKBIT);
- if (!(info & CTF_BOOL)) {
- CTSize shift = 32 - bsz;
- if (!(info & CTF_UNSIGNED)) {
- setintV(o, (int32_t)(val << (shift-pos)) >> shift);
- } else {
- val = (val << (shift-pos)) >> shift;
- if (!LJ_DUALNUM || (int32_t)val < 0)
- setnumV(o, (lua_Number)(uint32_t)val);
- else
- setintV(o, (int32_t)val);
- }
- } else {
- lua_assert(bsz == 1);
- setboolV(o, (val >> pos) & 1);
- }
- return 0; /* No GC step needed. */
-}
-
-/* -- TValue to C type conversion ----------------------------------------- */
-
-/* Convert table to array. */
-static void cconv_array_tab(CTState *cts, CType *d,
- uint8_t *dp, GCtab *t, CTInfo flags)
-{
- int32_t i;
- CType *dc = ctype_rawchild(cts, d); /* Array element type. */
- CTSize size = d->size, esize = dc->size, ofs = 0;
- for (i = 0; ; i++) {
- TValue *tv = (TValue *)lj_tab_getint(t, i);
- if (!tv || tvisnil(tv)) {
- if (i == 0) continue; /* Try again for 1-based tables. */
- break; /* Stop at first nil. */
- }
- if (ofs >= size)
- cconv_err_initov(cts, d);
- lj_cconv_ct_tv(cts, dc, dp + ofs, tv, flags);
- ofs += esize;
- }
- if (size != CTSIZE_INVALID) { /* Only fill up arrays with known size. */
- if (ofs == esize) { /* Replicate a single element. */
- for (; ofs < size; ofs += esize) memcpy(dp + ofs, dp, esize);
- } else { /* Otherwise fill the remainder with zero. */
- memset(dp + ofs, 0, size - ofs);
- }
- }
-}
-
-/* Convert table to sub-struct/union. */
-static void cconv_substruct_tab(CTState *cts, CType *d, uint8_t *dp,
- GCtab *t, int32_t *ip, CTInfo flags)
-{
- CTypeID id = d->sib;
- while (id) {
- CType *df = ctype_get(cts, id);
- id = df->sib;
- if (ctype_isfield(df->info) || ctype_isbitfield(df->info)) {
- TValue *tv;
- int32_t i = *ip, iz = i;
- if (!gcref(df->name)) continue; /* Ignore unnamed fields. */
- if (i >= 0) {
- retry:
- tv = (TValue *)lj_tab_getint(t, i);
- if (!tv || tvisnil(tv)) {
- if (i == 0) { i = 1; goto retry; } /* 1-based tables. */
- if (iz == 0) { *ip = i = -1; goto tryname; } /* Init named fields. */
- break; /* Stop at first nil. */
- }
- *ip = i + 1;
- } else {
- tryname:
- tv = (TValue *)lj_tab_getstr(t, gco2str(gcref(df->name)));
- if (!tv || tvisnil(tv)) continue;
- }
- if (ctype_isfield(df->info))
- lj_cconv_ct_tv(cts, ctype_rawchild(cts, df), dp+df->size, tv, flags);
- else
- lj_cconv_bf_tv(cts, df, dp+df->size, tv);
- if ((d->info & CTF_UNION)) break;
- } else if (ctype_isxattrib(df->info, CTA_SUBTYPE)) {
- cconv_substruct_tab(cts, ctype_rawchild(cts, df),
- dp+df->size, t, ip, flags);
- } /* Ignore all other entries in the chain. */
- }
-}
-
-/* Convert table to struct/union. */
-static void cconv_struct_tab(CTState *cts, CType *d,
- uint8_t *dp, GCtab *t, CTInfo flags)
-{
- int32_t i = 0;
- memset(dp, 0, d->size); /* Much simpler to clear the struct first. */
- cconv_substruct_tab(cts, d, dp, t, &i, flags);
-}
-
-/* Convert TValue to C type. Caveat: expects to get the raw CType! */
-void lj_cconv_ct_tv(CTState *cts, CType *d,
- uint8_t *dp, TValue *o, CTInfo flags)
-{
- CTypeID sid = CTID_P_VOID;
- CType *s;
- void *tmpptr;
- uint8_t tmpbool, *sp = (uint8_t *)&tmpptr;
- if (LJ_LIKELY(tvisint(o))) {
- sp = (uint8_t *)&o->i;
- sid = CTID_INT32;
- flags |= CCF_FROMTV;
- } else if (LJ_LIKELY(tvisnum(o))) {
- sp = (uint8_t *)&o->n;
- sid = CTID_DOUBLE;
- flags |= CCF_FROMTV;
- } else if (tviscdata(o)) {
- sp = cdataptr(cdataV(o));
- sid = cdataV(o)->ctypeid;
- s = ctype_get(cts, sid);
- if (ctype_isref(s->info)) { /* Resolve reference for value. */
- lua_assert(s->size == CTSIZE_PTR);
- sp = *(void **)sp;
- sid = ctype_cid(s->info);
- }
- s = ctype_raw(cts, sid);
- if (ctype_isfunc(s->info)) {
- sid = lj_ctype_intern(cts, CTINFO(CT_PTR, CTALIGN_PTR|sid), CTSIZE_PTR);
- } else {
- if (ctype_isenum(s->info)) s = ctype_child(cts, s);
- goto doconv;
- }
- } else if (tvisstr(o)) {
- GCstr *str = strV(o);
- if (ctype_isenum(d->info)) { /* Match string against enum constant. */
- CTSize ofs;
- CType *cct = lj_ctype_getfield(cts, d, str, &ofs);
- if (!cct || !ctype_isconstval(cct->info))
- goto err_conv;
- lua_assert(d->size == 4);
- sp = (uint8_t *)&cct->size;
- sid = ctype_cid(cct->info);
- } else if (ctype_isrefarray(d->info)) { /* Copy string to array. */
- CType *dc = ctype_rawchild(cts, d);
- CTSize sz = str->len+1;
- if (!ctype_isinteger(dc->info) || dc->size != 1)
- goto err_conv;
- if (d->size != 0 && d->size < sz)
- sz = d->size;
- memcpy(dp, strdata(str), sz);
- return;
- } else { /* Otherwise pass it as a const char[]. */
- sp = (uint8_t *)strdata(str);
- sid = CTID_A_CCHAR;
- flags |= CCF_FROMTV;
- }
- } else if (tvistab(o)) {
- if (ctype_isarray(d->info)) {
- cconv_array_tab(cts, d, dp, tabV(o), flags);
- return;
- } else if (ctype_isstruct(d->info)) {
- cconv_struct_tab(cts, d, dp, tabV(o), flags);
- return;
- } else {
- goto err_conv;
- }
- } else if (tvisbool(o)) {
- tmpbool = boolV(o);
- sp = &tmpbool;
- sid = CTID_BOOL;
- } else if (tvisnil(o)) {
- tmpptr = (void *)0;
- flags |= CCF_FROMTV;
- } else if (tvisudata(o)) {
- GCudata *ud = udataV(o);
- tmpptr = uddata(ud);
- if (ud->udtype == UDTYPE_IO_FILE)
- tmpptr = *(void **)tmpptr;
- } else if (tvislightud(o)) {
- tmpptr = lightudV(o);
- } else if (tvisfunc(o)) {
- void *p = lj_ccallback_new(cts, d, funcV(o));
- if (p) {
- *(void **)dp = p;
- return;
- }
- goto err_conv;
- } else {
- err_conv:
- cconv_err_convtv(cts, d, o, flags);
- }
- s = ctype_get(cts, sid);
-doconv:
- if (ctype_isenum(d->info)) d = ctype_child(cts, d);
- lj_cconv_ct_ct(cts, d, s, dp, sp, flags);
-}
-
-/* Convert TValue to bitfield. */
-void lj_cconv_bf_tv(CTState *cts, CType *d, uint8_t *dp, TValue *o)
-{
- CTInfo info = d->info;
- CTSize pos, bsz;
- uint32_t val, mask;
- lua_assert(ctype_isbitfield(info));
- if ((info & CTF_BOOL)) {
- uint8_t tmpbool;
- lua_assert(ctype_bitbsz(info) == 1);
- lj_cconv_ct_tv(cts, ctype_get(cts, CTID_BOOL), &tmpbool, o, 0);
- val = tmpbool;
- } else {
- CTypeID did = (info & CTF_UNSIGNED) ? CTID_UINT32 : CTID_INT32;
- lj_cconv_ct_tv(cts, ctype_get(cts, did), (uint8_t *)&val, o, 0);
- }
- pos = ctype_bitpos(info);
- bsz = ctype_bitbsz(info);
- lua_assert(pos < 8*ctype_bitcsz(info));
- lua_assert(bsz > 0 && bsz <= 8*ctype_bitcsz(info));
- /* Check if a packed bitfield crosses a container boundary. */
- if (pos + bsz > 8*ctype_bitcsz(info))
- lj_err_caller(cts->L, LJ_ERR_FFI_NYIPACKBIT);
- mask = ((1u << bsz) - 1u) << pos;
- val = (val << pos) & mask;
- /* NYI: packed bitfields may cause misaligned reads/writes. */
- switch (ctype_bitcsz(info)) {
- case 4: *(uint32_t *)dp = (*(uint32_t *)dp & ~mask) | (uint32_t)val; break;
- case 2: *(uint16_t *)dp = (*(uint16_t *)dp & ~mask) | (uint16_t)val; break;
- case 1: *(uint8_t *)dp = (*(uint8_t *)dp & ~mask) | (uint8_t)val; break;
- default: lua_assert(0); break;
- }
-}
-
-/* -- Initialize C type with TValues -------------------------------------- */
-
-/* Initialize an array with TValues. */
-static void cconv_array_init(CTState *cts, CType *d, CTSize sz, uint8_t *dp,
- TValue *o, MSize len)
-{
- CType *dc = ctype_rawchild(cts, d); /* Array element type. */
- CTSize ofs, esize = dc->size;
- MSize i;
- if (len*esize > sz)
- cconv_err_initov(cts, d);
- for (i = 0, ofs = 0; i < len; i++, ofs += esize)
- lj_cconv_ct_tv(cts, dc, dp + ofs, o + i, 0);
- if (ofs == esize) { /* Replicate a single element. */
- for (; ofs < sz; ofs += esize) memcpy(dp + ofs, dp, esize);
- } else { /* Otherwise fill the remainder with zero. */
- memset(dp + ofs, 0, sz - ofs);
- }
-}
-
-/* Initialize a sub-struct/union with TValues. */
-static void cconv_substruct_init(CTState *cts, CType *d, uint8_t *dp,
- TValue *o, MSize len, MSize *ip)
-{
- CTypeID id = d->sib;
- while (id) {
- CType *df = ctype_get(cts, id);
- id = df->sib;
- if (ctype_isfield(df->info) || ctype_isbitfield(df->info)) {
- MSize i = *ip;
- if (!gcref(df->name)) continue; /* Ignore unnamed fields. */
- if (i >= len) break;
- *ip = i + 1;
- if (ctype_isfield(df->info))
- lj_cconv_ct_tv(cts, ctype_rawchild(cts, df), dp+df->size, o + i, 0);
- else
- lj_cconv_bf_tv(cts, df, dp+df->size, o + i);
- if ((d->info & CTF_UNION)) break;
- } else if (ctype_isxattrib(df->info, CTA_SUBTYPE)) {
- cconv_substruct_init(cts, ctype_rawchild(cts, df),
- dp+df->size, o, len, ip);
- if ((d->info & CTF_UNION)) break;
- } /* Ignore all other entries in the chain. */
- }
-}
-
-/* Initialize a struct/union with TValues. */
-static void cconv_struct_init(CTState *cts, CType *d, CTSize sz, uint8_t *dp,
- TValue *o, MSize len)
-{
- MSize i = 0;
- memset(dp, 0, sz); /* Much simpler to clear the struct first. */
- cconv_substruct_init(cts, d, dp, o, len, &i);
- if (i < len)
- cconv_err_initov(cts, d);
-}
-
-/* Check whether to use a multi-value initializer.
-** This is true if an aggregate is to be initialized with a value.
-** Valarrays are treated as values here so ct_tv handles (V|C, I|F).
-*/
-int lj_cconv_multi_init(CTState *cts, CType *d, TValue *o)
-{
- if (!(ctype_isrefarray(d->info) || ctype_isstruct(d->info)))
- return 0; /* Destination is not an aggregate. */
- if (tvistab(o) || (tvisstr(o) && !ctype_isstruct(d->info)))
- return 0; /* Initializer is not a value. */
- if (tviscdata(o) && lj_ctype_rawref(cts, cdataV(o)->ctypeid) == d)
- return 0; /* Source and destination are identical aggregates. */
- return 1; /* Otherwise the initializer is a value. */
-}
-
-/* Initialize C type with TValues. Caveat: expects to get the raw CType! */
-void lj_cconv_ct_init(CTState *cts, CType *d, CTSize sz,
- uint8_t *dp, TValue *o, MSize len)
-{
- if (len == 0)
- memset(dp, 0, sz);
- else if (len == 1 && !lj_cconv_multi_init(cts, d, o))
- lj_cconv_ct_tv(cts, d, dp, o, 0);
- else if (ctype_isarray(d->info)) /* Also handles valarray init with len>1. */
- cconv_array_init(cts, d, sz, dp, o, len);
- else if (ctype_isstruct(d->info))
- cconv_struct_init(cts, d, sz, dp, o, len);
- else
- cconv_err_initov(cts, d);
-}
-
-#endif