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FFI: Add ffi.load() and ffi.C default namespace.

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This commit is contained in:
Mike Pall
2011-01-10 03:43:18 +01:00
parent d215747fd5
commit ddf6596333
11 changed files with 435 additions and 15 deletions
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88
src/lib_ffi.c
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@@ -22,6 +22,7 @@
#include "lj_cdata.h"
#include "lj_cconv.h"
#include "lj_ccall.h"
#include "lj_clib.h"
#include "lj_ff.h"
#include "lj_lib.h"
@@ -357,6 +358,77 @@ checkgc:
#include "lj_libdef.h"
/* -- C library metamethods ----------------------------------------------- */
#define LJLIB_MODULE_ffi_clib
/* Index C library by a name. */
static TValue *ffi_clib_index(lua_State *L)
{
TValue *o = L->base;
CLibrary *cl;
if (!(o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB))
lj_err_argt(L, 1, LUA_TUSERDATA);
cl = (CLibrary *)uddata(udataV(o));
if (!(o+1 < L->top && tvisstr(o+1)))
lj_err_argt(L, 2, LUA_TSTRING);
return lj_clib_index(L, cl, strV(o+1));
}
LJLIB_CF(ffi_clib___index)
{
TValue *tv = ffi_clib_index(L);
if (tviscdata(tv)) {
CTState *cts = ctype_cts(L);
GCcdata *cd = cdataV(tv);
CType *s = ctype_get(cts, cd->typeid);
if (ctype_isextern(s->info)) {
CTypeID sid = ctype_cid(s->info);
void *sp = *(void **)cdataptr(cd);
if (lj_cconv_tv_ct(cts, ctype_raw(cts, sid), sid, L->top-1, sp))
lj_gc_check(L);
return 1;
}
}
copyTV(L, L->top-1, tv);
return 1;
}
LJLIB_CF(ffi_clib___newindex)
{
TValue *tv = ffi_clib_index(L);
TValue *o = L->base+2;
if (o < L->top && tviscdata(tv)) {
CTState *cts = ctype_cts(L);
GCcdata *cd = cdataV(tv);
CType *d = ctype_get(cts, cd->typeid);
if (ctype_isextern(d->info)) {
CTInfo qual = 0;
for (;;) { /* Skip attributes and collect qualifiers. */
d = ctype_child(cts, d);
if (!ctype_isattrib(d->info)) break;
if (ctype_attrib(d->info) == CTA_QUAL) qual |= d->size;
}
if (!((d->info|qual) & CTF_CONST)) {
lj_cconv_ct_tv(cts, d, *(void **)cdataptr(cd), o, 0);
return 0;
}
}
}
lj_err_caller(L, LJ_ERR_FFI_WRCONST);
return 0; /* unreachable */
}
LJLIB_CF(ffi_clib___gc)
{
TValue *o = L->base;
if (o < L->top && tvisudata(o) && udataV(o)->udtype == UDTYPE_FFI_CLIB)
lj_clib_unload((CLibrary *)uddata(udataV(o)));
return 0;
}
#include "lj_libdef.h"
/* -- FFI library functions ----------------------------------------------- */
#define LJLIB_MODULE_ffi
@@ -567,6 +639,17 @@ LJLIB_CF(ffi_abi)
#undef H_
LJLIB_PUSH(top-5) LJLIB_SET(!) /* Store clib metatable in func environment. */
LJLIB_CF(ffi_load)
{
GCstr *name = lj_lib_checkstr(L, 1);
int global = (L->base+1 < L->top && tvistruecond(L->base+1));
lj_clib_load(L, tabref(curr_func(L)->c.env), name, global);
return 1;
}
LJLIB_PUSH(top-4) LJLIB_SET(C)
LJLIB_PUSH(top-3) LJLIB_SET(os)
LJLIB_PUSH(top-2) LJLIB_SET(arch)
@@ -579,8 +662,9 @@ LUALIB_API int luaopen_ffi(lua_State *L)
lj_ctype_init(L);
LJ_LIB_REG_(L, NULL, ffi_meta);
/* NOBARRIER: basemt is a GC root. */
L->top--;
setgcref(basemt_it(G(L), LJ_TCDATA), obj2gco(tabV(L->top)));
setgcref(basemt_it(G(L), LJ_TCDATA), obj2gco(tabV(L->top-1)));
LJ_LIB_REG_(L, NULL, ffi_clib);
lj_clib_default(L, tabV(L->top-1)); /* Create ffi.C default namespace. */
lua_pushliteral(L, LJ_OS_NAME);
lua_pushliteral(L, LJ_ARCH_NAME);
LJ_LIB_REG_(L, NULL, ffi); /* Note: no global "ffi" created! */