diff options
Diffstat (limited to 'upb/bindings/lua/upb/table.c')
-rw-r--r-- | upb/bindings/lua/upb/table.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/upb/bindings/lua/upb/table.c b/upb/bindings/lua/upb/table.c deleted file mode 100644 index 79120c7..0000000 --- a/upb/bindings/lua/upb/table.c +++ /dev/null @@ -1,211 +0,0 @@ -/* -** require("upb.table") -- a Lua extension for accessing upb_table -** -** This is an internal-only interface and exists for the sole purpose of -** writing a C code generator in Lua that can dump a upb_table as static C -** initializers. This lets us use Lua for convenient string manipulation while -** saving us from re-implementing the upb_table hash function and hash table -** layout / collision strategy in Lua. -** -** Since this is used only as part of the toolchain (and not part of the -** runtime) we do not hold this module to the same stringent requirements as -** the main Lua modules (for example that misbehaving Lua programs cannot -** crash the interpreter). -*/ - -#include <float.h> -#include <math.h> -#include <stdlib.h> -#include <string.h> - -#include "lauxlib.h" -#include "upb/bindings/lua/upb.h" -#include "upb/def.h" -#include "upb/structdefs.int.h" -#include "upb/table.int.h" - -static void lupbtable_setnum(lua_State *L, int tab, const char *key, - lua_Number val) { - lua_pushnumber(L, val); - lua_setfield(L, tab - 1, key); -} - -static void lupbtable_pushval(lua_State *L, upb_tabval val, upb_ctype_t ctype) { - switch (ctype) { - case UPB_CTYPE_INT32: - lua_pushnumber(L, val.val); - break; - case UPB_CTYPE_PTR: - lupb_def_pushwrapper(L, (void*)val.val, NULL); - break; - case UPB_CTYPE_CSTR: - lua_pushstring(L, (const char*)val.val); - break; - default: - luaL_error(L, "Unexpected type: %d", ctype); - } -} - -/* Sets a few fields common to both hash table entries and arrays. */ -static void lupbtable_setmetafields(lua_State *L, int ctype, const void *ptr) { - /* We tack this onto every entry so we know it even if the entries - * don't stay with the table. */ - lua_pushnumber(L, ctype); - lua_setfield(L, -2, "valtype"); - - /* Set this to facilitate linking. */ - lua_pushlightuserdata(L, (void*)ptr); - lua_setfield(L, -2, "ptr"); -} - -static void lupbtable_pushent(lua_State *L, const upb_tabent *e, - bool inttab, int ctype) { - lua_newtable(L); - if (!upb_tabent_isempty(e)) { - if (inttab) { - lua_pushnumber(L, e->key); - } else { - uint32_t len; - const char *str = upb_tabstr(e->key, &len); - lua_pushlstring(L, str, len); - } - lua_setfield(L, -2, "key"); - lupbtable_pushval(L, e->val, ctype); - lua_setfield(L, -2, "value"); - } - lua_pushlightuserdata(L, (void*)e->next); - lua_setfield(L, -2, "next"); - lupbtable_setmetafields(L, ctype, e); -} - -/* Dumps the shared part of upb_table into a Lua table. */ -static void lupbtable_pushtable(lua_State *L, const upb_table *t, bool inttab) { - size_t i; - - lua_newtable(L); - lupbtable_setnum(L, -1, "count", t->count); - lupbtable_setnum(L, -1, "mask", t->mask); - lupbtable_setnum(L, -1, "ctype", t->ctype); - lupbtable_setnum(L, -1, "size_lg2", t->size_lg2); - - lua_newtable(L); - for (i = 0; i < upb_table_size(t); i++) { - lupbtable_pushent(L, &t->entries[i], inttab, t->ctype); - lua_rawseti(L, -2, i + 1); - } - lua_setfield(L, -2, "entries"); -} - -/* Dumps a upb_inttable to a Lua table. */ -static void lupbtable_pushinttable(lua_State *L, const upb_inttable *t) { - size_t i; - - lupbtable_pushtable(L, &t->t, true); - lupbtable_setnum(L, -1, "array_size", t->array_size); - lupbtable_setnum(L, -1, "array_count", t->array_count); - - lua_newtable(L); - for (i = 0; i < t->array_size; i++) { - lua_newtable(L); - if (upb_arrhas(t->array[i])) { - lupbtable_pushval(L, t->array[i], t->t.ctype); - lua_setfield(L, -2, "val"); - } - lupbtable_setmetafields(L, t->t.ctype, &t->array[i]); - lua_rawseti(L, -2, i + 1); - } - lua_setfield(L, -2, "array"); -} - -static void lupbtable_pushstrtable(lua_State *L, const upb_strtable *t) { - lupbtable_pushtable(L, &t->t, false); -} - -static int lupbtable_msgdef_itof(lua_State *L) { - const upb_msgdef *m = lupb_msgdef_check(L, 1); - lupbtable_pushinttable(L, &m->itof); - return 1; -} - -static int lupbtable_msgdef_ntof(lua_State *L) { - const upb_msgdef *m = lupb_msgdef_check(L, 1); - lupbtable_pushstrtable(L, &m->ntof); - return 1; -} - -static int lupbtable_enumdef_iton(lua_State *L) { - const upb_enumdef *e = lupb_enumdef_check(L, 1); - lupbtable_pushinttable(L, &e->iton); - return 1; -} - -static int lupbtable_enumdef_ntoi(lua_State *L) { - const upb_enumdef *e = lupb_enumdef_check(L, 1); - lupbtable_pushstrtable(L, &e->ntoi); - return 1; -} - -static int lupbtable_symtab_symtab(lua_State *L) { - const upb_symtab *s = lupb_symtab_check(L, 1); - lupbtable_pushstrtable(L, &s->symtab); - return 1; -} - -static void lupbtable_setfieldi(lua_State *L, const char *field, int i) { - lua_pushnumber(L, i); - lua_setfield(L, -2, field); -} - -/* These aren't from the table, but they access other internal-only - * definitions. */ -static int lupb_fielddef_selectorbase(lua_State *L) { - const upb_fielddef *f = lupb_fielddef_check(L, 1); - if (!upb_fielddef_isfrozen(f)) - luaL_error(L, "_selectorbase is only defined for frozen fielddefs"); - lua_pushinteger(L, f->selector_base); - return 1; -} - -static int lupb_msgdef_selectorcount(lua_State *L) { - const upb_msgdef *m = lupb_msgdef_check(L, 1); - lua_pushinteger(L, m->selector_count); - return 1; -} - -static int lupb_msgdef_submsgfieldcount(lua_State *L) { - const upb_msgdef *m = lupb_msgdef_check(L, 1); - lua_pushinteger(L, m->submsg_field_count); - return 1; -} - -static const struct luaL_Reg lupbtable_toplevel_m[] = { - {"msgdef_itof", lupbtable_msgdef_itof}, - {"msgdef_ntof", lupbtable_msgdef_ntof}, - {"enumdef_iton", lupbtable_enumdef_iton}, - {"enumdef_ntoi", lupbtable_enumdef_ntoi}, - {"symtab_symtab", lupbtable_symtab_symtab}, - - {"msgdef_selector_count", lupb_msgdef_selectorcount}, - {"msgdef_submsg_field_count", lupb_msgdef_submsgfieldcount}, - - {"fielddef_selector_base", lupb_fielddef_selectorbase}, - - {NULL, NULL} -}; - -int luaopen_upb_table_c(lua_State *L) { - static char module_key; - if (lupb_openlib(L, &module_key, "upb.table", lupbtable_toplevel_m)) { - return 1; - } - - /* We define these here because they are not public. */ - lupbtable_setfieldi(L, "CTYPE_PTR", UPB_CTYPE_PTR); - lupbtable_setfieldi(L, "CTYPE_CSTR", UPB_CTYPE_CSTR); - lupbtable_setfieldi(L, "CTYPE_INT32", UPB_CTYPE_INT32); - - lua_pushlightuserdata(L, NULL); - lua_setfield(L, -2, "NULL"); - - return 1; /* Return a single Lua value, the package table created above. */ -} |