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protobuf/upb/bindings/lua/upb.c

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/*
** require("lua") -- A Lua extension for upb.
**
** Exposes only the core library
** (sub-libraries are exposed in other extensions).
**
** 64-bit woes: Lua can only represent numbers of type lua_Number (which is
** double unless the user specifically overrides this). Doubles can represent
** the entire range of 64-bit integers, but lose precision once the integers are
** greater than 2^53.
**
** Lua 5.3 is adding support for integers, which will allow for 64-bit
** integers (which can be interpreted as signed or unsigned).
**
** LuaJIT supports 64-bit signed and unsigned boxed representations
** through its "cdata" mechanism, but this is not portable to regular Lua.
**
** Hopefully Lua 5.3 will come soon enough that we can either use Lua 5.3
** integer support or LuaJIT 64-bit cdata for users that need the entire
** domain of [u]int64 values.
*/
#include <float.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "lauxlib.h"
#include "upb/bindings/lua/upb.h"
#include "upb/handlers.h"
#include "upb/pb/glue.h"
#include "upb/shim/shim.h"
/* Lua metatable types. */
#define LUPB_MSG "lupb.msg"
#define LUPB_ARRAY "lupb.array"
#define LUPB_MSGDEF "lupb.msgdef"
#define LUPB_ENUMDEF "lupb.enumdef"
#define LUPB_FIELDDEF "lupb.fielddef"
#define LUPB_FILEDEF "lupb.filedef"
#define LUPB_SYMTAB "lupb.symtab"
/* Other table constants. */
#define LUPB_OBJCACHE "lupb.objcache"
static void lupb_msgdef_init(lua_State *L);
static size_t lupb_msgdef_sizeof();
/* Lua compatibility code *****************************************************/
/* Lua 5.1 and Lua 5.2 have slightly incompatible APIs. A little bit of
* compatibility code can help hide the difference. Not too many people still
* use Lua 5.1 but LuaJIT uses the Lua 5.1 API in some ways. */
#if LUA_VERSION_NUM == 501
/* taken from lua 5.2's source. */
void *luaL_testudata(lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
if (p != NULL) { /* value is a userdata? */
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
luaL_getmetatable(L, tname); /* get correct metatable */
if (!lua_rawequal(L, -1, -2)) /* not the same? */
p = NULL; /* value is a userdata with wrong metatable */
lua_pop(L, 2); /* remove both metatables */
return p;
}
}
return NULL; /* value is not a userdata with a metatable */
}
static void lupb_newlib(lua_State *L, const char *name, const luaL_Reg *funcs) {
luaL_register(L, name, funcs);
}
#define lupb_setfuncs(L, l) luaL_register(L, NULL, l)
#elif LUA_VERSION_NUM == 502
int luaL_typerror(lua_State *L, int narg, const char *tname) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
tname, luaL_typename(L, narg));
return luaL_argerror(L, narg, msg);
}
static void lupb_newlib(lua_State *L, const char *name, const luaL_Reg *funcs) {
/* Lua 5.2 modules are not expected to set a global variable, so "name" is
* unused. */
UPB_UNUSED(name);
/* Can't use luaL_newlib(), because funcs is not the actual array.
* Could (micro-)optimize this a bit to count funcs for initial table size. */
lua_createtable(L, 0, 8);
luaL_setfuncs(L, funcs, 0);
}
#define lupb_setfuncs(L, l) luaL_setfuncs(L, l, 0)
#else
#error Only Lua 5.1 and 5.2 are supported
#endif
/* Shims for upcoming Lua 5.3 functionality. */
bool lua_isinteger(lua_State *L, int argn) {
UPB_UNUSED(L);
UPB_UNUSED(argn);
return false;
}
/* Utility functions **********************************************************/
/* We store our module table in the registry, keyed by ptr.
* For more info about the motivation/rationale, see this thread:
* http://thread.gmane.org/gmane.comp.lang.lua.general/110632 */
bool lupb_openlib(lua_State *L, void *ptr, const char *name,
const luaL_Reg *funcs) {
/* Lookup cached module table. */
lua_pushlightuserdata(L, ptr);
lua_rawget(L, LUA_REGISTRYINDEX);
if (!lua_isnil(L, -1)) {
return true;
}
lupb_newlib(L, name, funcs);
/* Save module table in cache. */
lua_pushlightuserdata(L, ptr);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX);
return false;
}
/* Pushes a new userdata with the given metatable and ensures that it has a
* uservalue. */
static void *newudata_with_userval(lua_State *L, size_t size,
const char *type) {
void *ret = lua_newuserdata(L, size);
/* Set metatable. */
luaL_getmetatable(L, type);
assert(!lua_isnil(L, -1)); /* Should have been created by luaopen_upb. */
lua_setmetatable(L, -2);
lua_newtable(L);
lua_setuservalue(L, -2);
return ret;
}
const char *lupb_checkname(lua_State *L, int narg) {
size_t len;
const char *name = luaL_checklstring(L, narg, &len);
if (strlen(name) != len)
luaL_error(L, "names cannot have embedded NULLs");
return name;
}
bool lupb_checkbool(lua_State *L, int narg) {
if (!lua_isboolean(L, narg)) {
luaL_error(L, "must be true or false");
}
return lua_toboolean(L, narg);
}
/* Unlike luaL_checkstring(), this does not allow implicit conversion to
* string. */
void lupb_checkstring(lua_State *L, int narg) {
if (lua_type(L, narg) != LUA_TSTRING)
luaL_error(L, "Expected string");
}
/* Unlike luaL_checkinteger, these do not implicitly convert from string or
* round an existing double value. We allow floating-point input, but only if
* the actual value is integral. */
#define INTCHECK(type, ctype) \
ctype lupb_check##type(lua_State *L, int narg) { \
double n; \
ctype i; \
if (lua_isinteger(L, narg)) { \
return lua_tointeger(L, narg); \
} \
\
/* Prevent implicit conversion from string. */ \
luaL_checktype(L, narg, LUA_TNUMBER); \
n = lua_tonumber(L, narg); \
\
i = (ctype)n; \
if ((double)i != n) { \
/* double -> ctype truncated or rounded. */ \
luaL_error(L, "number %f was not an integer or out of range for " #type, \
n); \
} \
return i; \
} \
void lupb_push##type(lua_State *L, ctype val) { \
/* TODO: push integer for Lua >= 5.3, 64-bit cdata for LuaJIT. */ \
/* This is lossy for some [u]int64 values, which isn't great, but */ \
/* crashing when we encounter these values seems worse. */ \
lua_pushnumber(L, val); \
}
INTCHECK(int64, int64_t)
INTCHECK(int32, int32_t)
INTCHECK(uint64, uint64_t)
INTCHECK(uint32, uint32_t)
double lupb_checkdouble(lua_State *L, int narg) {
/* If we were being really hard-nosed here, we'd check whether the input was
* an integer that has no precise double representation. But doubles aren't
* generally expected to be exact like integers are, and worse this could
* cause data-dependent runtime errors: one run of the program could work fine
* because the integer calculations happened to be exactly representable in
* double, while the next could crash because of subtly different input. */
luaL_checktype(L, narg, LUA_TNUMBER); /* lua_tonumber() auto-converts. */
return lua_tonumber(L, narg);
}
float lupb_checkfloat(lua_State *L, int narg) {
/* We don't worry about checking whether the input can be exactly converted to
* float -- see above. */
luaL_checktype(L, narg, LUA_TNUMBER); /* lua_tonumber() auto-converts. */
return lua_tonumber(L, narg);
}
void lupb_pushdouble(lua_State *L, double d) {
lua_pushnumber(L, d);
}
void lupb_pushfloat(lua_State *L, float d) {
lua_pushnumber(L, d);
}
static void lupb_checkval(lua_State *L, int narg, upb_fieldtype_t type) {
switch(type) {
case UPB_TYPE_INT32:
case UPB_TYPE_ENUM:
lupb_checkint32(L, narg);
break;
case UPB_TYPE_INT64:
lupb_checkint64(L, narg);
break;
case UPB_TYPE_UINT32:
lupb_checkuint32(L, narg);
break;
case UPB_TYPE_UINT64:
lupb_checkuint64(L, narg);
break;
case UPB_TYPE_DOUBLE:
lupb_checkdouble(L, narg);
break;
case UPB_TYPE_FLOAT:
lupb_checkfloat(L, narg);
break;
case UPB_TYPE_BOOL:
lupb_checkbool(L, narg);
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
lupb_checkstring(L, narg);
break;
case UPB_TYPE_MESSAGE:
lupb_assert(L, false);
}
}
void lupb_checkstatus(lua_State *L, upb_status *s) {
if (!upb_ok(s)) {
lua_pushstring(L, upb_status_errmsg(s));
lua_error(L);
}
}
static upb_fieldtype_t lupb_checkfieldtype(lua_State *L, int narg) {
int type = luaL_checkint(L, narg);
if (!upb_fielddef_checktype(type))
luaL_argerror(L, narg, "invalid field type");
return type;
}
#define CHK(pred) do { \
upb_status status = UPB_STATUS_INIT; \
pred; \
lupb_checkstatus(L, &status); \
} while (0)
/* lupb_refcounted ************************************************************/
/* All upb objects that use upb_refcounted have a userdata that begins with a
* pointer to that object. Each type has its own metatable. Objects are cached
* in a weak table indexed by the C pointer of the object they are caching.
*
* Note that we consistently use memcpy() to read to/from the object. This
* allows the userdata to use its own struct without violating aliasing, as
* long as it begins with a pointer. */
/* Checks type; if it matches, pulls the pointer out of the wrapper. */
void *lupb_refcounted_check(lua_State *L, int narg, const char *type) {
void *ud = luaL_checkudata(L, narg, type);
void *ret;
memcpy(&ret, ud, sizeof ret);
if (!ret) luaL_error(L, "called into dead object");
return ret;
}
bool lupb_refcounted_pushwrapper(lua_State *L, const upb_refcounted *obj,
const char *type, const void *ref_donor,
size_t size) {
bool create;
void *ud;
if (obj == NULL) {
lua_pushnil(L);
return false;
}
/* Lookup our cache in the registry (we don't put our objects in the registry
* directly because we need our cache to be a weak table). */
lua_getfield(L, LUA_REGISTRYINDEX, LUPB_OBJCACHE);
assert(!lua_isnil(L, -1)); /* Should have been created by luaopen_upb. */
lua_pushlightuserdata(L, (void*)obj);
lua_rawget(L, -2);
/* Stack is now: objcache, cached value. */
create = false;
if (lua_isnil(L, -1)) {
create = true;
} else {
void *ud = lua_touserdata(L, -1);
void *ud_obj;
lupb_assert(L, ud);
memcpy(&ud_obj, ud, sizeof(void*));
/* A corner case: it is possible for the value to be GC'd
* already, in which case we should evict this entry and create
* a new one. */
if (ud_obj == NULL) {
create = true;
}
}
ud = NULL;
if (create) {
/* Remove bad cached value and push new value. */
lua_pop(L, 1);
/* All of our userdata begin with a pointer to the obj. */
ud = lua_newuserdata(L, size);
memcpy(ud, &obj, sizeof(void*));
upb_refcounted_donateref(obj, ref_donor, ud);
luaL_getmetatable(L, type);
/* Should have been created by luaopen_upb. */
lupb_assert(L, !lua_isnil(L, -1));
lua_setmetatable(L, -2);
/* Set it in the cache. */
lua_pushlightuserdata(L, (void*)obj);
lua_pushvalue(L, -2);
lua_rawset(L, -4);
} else {
/* Existing wrapper obj already has a ref. */
ud = lua_touserdata(L, -1);
upb_refcounted_checkref(obj, ud);
if (ref_donor)
upb_refcounted_unref(obj, ref_donor);
}
lua_insert(L, -2);
lua_pop(L, 1);
return create;
}
void lupb_refcounted_pushnewrapper(lua_State *L, const upb_refcounted *obj,
const char *type, const void *ref_donor) {
bool created =
lupb_refcounted_pushwrapper(L, obj, type, ref_donor, sizeof(void *));
UPB_ASSERT_VAR(created, created == true);
}
static int lupb_refcounted_gc(lua_State *L) {
void *ud = lua_touserdata(L, 1);
void *nullp;
upb_refcounted *obj;
memcpy(&obj, ud, sizeof(obj));
upb_refcounted_unref(obj, ud);
/* Zero out pointer so we can detect a call into a GC'd object. */
nullp = NULL;
memcpy(ud, &nullp, sizeof(nullp));
return 0;
}
static const struct luaL_Reg lupb_refcounted_mm[] = {
{"__gc", lupb_refcounted_gc},
{NULL, NULL}
};
/* lupb_def *******************************************************************/
static const upb_def *lupb_def_check(lua_State *L, int narg) {
upb_def *ret;
void *ud = luaL_testudata(L, narg, LUPB_MSGDEF);
if (!ud) ud = luaL_testudata(L, narg, LUPB_ENUMDEF);
if (!ud) ud = luaL_testudata(L, narg, LUPB_FIELDDEF);
if (!ud) luaL_typerror(L, narg, "upb def");
memcpy(&ret, ud, sizeof ret);
if (!ret) luaL_error(L, "called into dead object");
return ret;
}
static upb_def *lupb_def_checkmutable(lua_State *L, int narg) {
const upb_def *def = lupb_def_check(L, narg);
if (upb_def_isfrozen(def))
luaL_error(L, "not allowed on frozen value");
return (upb_def*)def;
}
bool lupb_def_pushwrapper(lua_State *L, const upb_def *def,
const void *ref_donor) {
const char *type = NULL;
size_t size = sizeof(void*);
bool created;
if (def == NULL) {
lua_pushnil(L);
return false;
}
switch (upb_def_type(def)) {
case UPB_DEF_MSG: {
type = LUPB_MSGDEF;
size = lupb_msgdef_sizeof();
break;
}
case UPB_DEF_ENUM: type = LUPB_ENUMDEF; break;
case UPB_DEF_FIELD: type = LUPB_FIELDDEF; break;
default: luaL_error(L, "unknown deftype %d", upb_def_type(def));
}
created =
lupb_refcounted_pushwrapper(L, upb_def_upcast(def), type, ref_donor, size);
if (created && upb_def_type(def) == UPB_DEF_MSG) {
lupb_msgdef_init(L);
}
return created;
}
void lupb_def_pushnewrapper(lua_State *L, const upb_def *def,
const void *ref_donor) {
bool created = lupb_def_pushwrapper(L, def, ref_donor);
UPB_ASSERT_VAR(created, created == true);
}
static int lupb_def_type(lua_State *L) {
const upb_def *def = lupb_def_check(L, 1);
lua_pushinteger(L, upb_def_type(def));
return 1;
}
static int lupb_def_freeze(lua_State *L) {
upb_def *def = lupb_def_checkmutable(L, 1);
CHK(upb_def_freeze(&def, 1, &status));
return 0;
}
static int lupb_def_isfrozen(lua_State *L) {
const upb_def *def = lupb_def_check(L, 1);
lua_pushboolean(L, upb_def_isfrozen(def));
return 1;
}
static int lupb_def_fullname(lua_State *L) {
const upb_def *def = lupb_def_check(L, 1);
lua_pushstring(L, upb_def_fullname(def));
return 1;
}
static int lupb_def_name(lua_State *L) {
const upb_def *def = lupb_def_check(L, 1);
lua_pushstring(L, upb_def_name(def));
return 1;
}
static int lupb_def_setfullname(lua_State *L) {
const char *name = lupb_checkname(L, 2);
CHK(upb_def_setfullname(lupb_def_checkmutable(L, 1), name, &status));
return 0;
}
#define LUPB_COMMON_DEF_METHODS \
{"def_type", lupb_def_type}, \
{"full_name", lupb_def_fullname}, \
{"freeze", lupb_def_freeze}, \
{"is_frozen", lupb_def_isfrozen}, \
{"name", lupb_def_name}, \
{"set_full_name", lupb_def_setfullname}, \
/* lupb_fielddef **************************************************************/
const upb_fielddef *lupb_fielddef_check(lua_State *L, int narg) {
return lupb_refcounted_check(L, narg, LUPB_FIELDDEF);
}
static upb_fielddef *lupb_fielddef_checkmutable(lua_State *L, int narg) {
const upb_fielddef *f = lupb_fielddef_check(L, narg);
if (upb_fielddef_isfrozen(f))
luaL_error(L, "not allowed on frozen value");
return (upb_fielddef*)f;
}
static int lupb_fielddef_new(lua_State *L) {
upb_fielddef *f = upb_fielddef_new(&f);
lupb_def_pushnewrapper(L, upb_fielddef_upcast(f), &f);
return 1;
}
/* Getters */
static int lupb_fielddef_containingtype(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lupb_def_pushwrapper(L, upb_msgdef_upcast(upb_fielddef_containingtype(f)),
NULL);
return 1;
}
static int lupb_fielddef_containingtypename(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
lua_pushstring(L, upb_fielddef_containingtypename(f));
return 1;
}
static int lupb_fielddef_default(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
switch (upb_fielddef_type(f)) {
case UPB_TYPE_INT32:
int32:
lupb_pushint32(L, upb_fielddef_defaultint32(f)); break;
case UPB_TYPE_INT64:
lupb_pushint64(L, upb_fielddef_defaultint64(f)); break;
case UPB_TYPE_UINT32:
lupb_pushuint32(L, upb_fielddef_defaultuint32(f)); break;
case UPB_TYPE_UINT64:
lupb_pushuint64(L, upb_fielddef_defaultuint64(f)); break;
case UPB_TYPE_DOUBLE:
lua_pushnumber(L, upb_fielddef_defaultdouble(f)); break;
case UPB_TYPE_FLOAT:
lua_pushnumber(L, upb_fielddef_defaultfloat(f)); break;
case UPB_TYPE_BOOL:
lua_pushboolean(L, upb_fielddef_defaultbool(f)); break;
case UPB_TYPE_ENUM:
if (upb_fielddef_enumhasdefaultstr(f)) {
goto str;
} else if (upb_fielddef_enumhasdefaultint32(f)) {
goto int32;
} else {
lua_pushnil(L);
}
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
str: {
size_t len;
const char *data = upb_fielddef_defaultstr(f, &len);
lua_pushlstring(L, data, len);
break;
}
case UPB_TYPE_MESSAGE:
return luaL_error(L, "Message fields do not have explicit defaults.");
}
return 1;
}
static int lupb_fielddef_getsel(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
upb_selector_t sel;
if (upb_handlers_getselector(f, luaL_checknumber(L, 2), &sel)) {
lua_pushinteger(L, sel);
return 1;
} else {
return 0;
}
}
static int lupb_fielddef_hassubdef(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushboolean(L, upb_fielddef_hassubdef(f));
return 1;
}
static int lupb_fielddef_index(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushinteger(L, upb_fielddef_index(f));
return 1;
}
static int lupb_fielddef_intfmt(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushinteger(L, upb_fielddef_intfmt(f));
return 1;
}
static int lupb_fielddef_isextension(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushboolean(L, upb_fielddef_isextension(f));
return 1;
}
static int lupb_fielddef_istagdelim(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushboolean(L, upb_fielddef_istagdelim(f));
return 1;
}
static int lupb_fielddef_label(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushinteger(L, upb_fielddef_label(f));
return 1;
}
static int lupb_fielddef_lazy(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushboolean(L, upb_fielddef_lazy(f));
return 1;
}
static int lupb_fielddef_name(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushstring(L, upb_fielddef_name(f));
return 1;
}
static int lupb_fielddef_number(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
int32_t num = upb_fielddef_number(f);
if (num)
lua_pushinteger(L, num);
else
lua_pushnil(L);
return 1;
}
static int lupb_fielddef_packed(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
lua_pushboolean(L, upb_fielddef_packed(f));
return 1;
}
static int lupb_fielddef_subdef(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
const upb_def *def;
if (!upb_fielddef_hassubdef(f))
luaL_error(L, "Tried to get subdef of non-message field");
def = upb_fielddef_subdef(f);
lupb_def_pushwrapper(L, def, NULL);
return 1;
}
static int lupb_fielddef_subdefname(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
if (!upb_fielddef_hassubdef(f))
luaL_error(L, "Tried to get subdef name of non-message field");
lua_pushstring(L, upb_fielddef_subdefname(f));
return 1;
}
static int lupb_fielddef_type(lua_State *L) {
const upb_fielddef *f = lupb_fielddef_check(L, 1);
if (upb_fielddef_typeisset(f))
lua_pushinteger(L, upb_fielddef_type(f));
else
lua_pushnil(L);
return 1;
}
/* Setters */
static int lupb_fielddef_setcontainingtypename(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
const char *name = NULL;
if (!lua_isnil(L, 2))
name = lupb_checkname(L, 2);
CHK(upb_fielddef_setcontainingtypename(f, name, &status));
return 0;
}
static int lupb_fielddef_setdefault(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
switch (upb_fielddef_type(f)) {
case UPB_TYPE_INT32:
upb_fielddef_setdefaultint32(f, lupb_checkint32(L, 2));
break;
case UPB_TYPE_INT64:
upb_fielddef_setdefaultint64(f, lupb_checkint64(L, 2));
break;
case UPB_TYPE_UINT32:
upb_fielddef_setdefaultuint32(f, lupb_checkuint32(L, 2));
break;
case UPB_TYPE_UINT64:
upb_fielddef_setdefaultuint64(f, lupb_checkuint64(L, 2));
break;
case UPB_TYPE_DOUBLE:
upb_fielddef_setdefaultdouble(f, lupb_checkdouble(L, 2));
break;
case UPB_TYPE_FLOAT:
upb_fielddef_setdefaultfloat(f, lupb_checkfloat(L, 2));
break;
case UPB_TYPE_BOOL:
upb_fielddef_setdefaultbool(f, lupb_checkbool(L, 2));
break;
case UPB_TYPE_MESSAGE:
return luaL_error(L, "Message types cannot have defaults.");
case UPB_TYPE_ENUM:
if (lua_type(L, 2) != LUA_TSTRING) {
upb_fielddef_setdefaultint32(f, lupb_checkint32(L, 2));
break;
}
/* Else fall through and set string default. */
case UPB_TYPE_BYTES:
case UPB_TYPE_STRING: {
size_t len;
const char *str = lua_tolstring(L, 2, &len);
CHK(upb_fielddef_setdefaultstr(f, str, len, &status));
}
}
return 0;
}
static int lupb_fielddef_setisextension(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
CHK(upb_fielddef_setisextension(f, lupb_checkbool(L, 2)));
return 0;
}
static int lupb_fielddef_setlabel(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
int label = luaL_checkint(L, 2);
if (!upb_fielddef_checklabel(label))
luaL_argerror(L, 2, "invalid field label");
upb_fielddef_setlabel(f, label);
return 0;
}
static int lupb_fielddef_setlazy(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
upb_fielddef_setlazy(f, lupb_checkbool(L, 2));
return 0;
}
static int lupb_fielddef_setname(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
CHK(upb_fielddef_setname(f, lupb_checkname(L, 2), &status));
return 0;
}
static int lupb_fielddef_setnumber(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
CHK(upb_fielddef_setnumber(f, luaL_checkint(L, 2), &status));
return 0;
}
static int lupb_fielddef_setpacked(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
upb_fielddef_setpacked(f, lupb_checkbool(L, 2));
return 0;
}
static int lupb_fielddef_setsubdef(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
const upb_def *def = NULL;
if (!lua_isnil(L, 2))
def = lupb_def_check(L, 2);
CHK(upb_fielddef_setsubdef(f, def, &status));
return 0;
}
static int lupb_fielddef_setsubdefname(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
const char *name = NULL;
if (!lua_isnil(L, 2))
name = lupb_checkname(L, 2);
CHK(upb_fielddef_setsubdefname(f, name, &status));
return 0;
}
static int lupb_fielddef_settype(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
upb_fielddef_settype(f, lupb_checkfieldtype(L, 2));
return 0;
}
static int lupb_fielddef_setintfmt(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
int32_t intfmt = luaL_checknumber(L, 2);
if (!upb_fielddef_checkintfmt(intfmt))
luaL_argerror(L, 2, "invalid intfmt");
upb_fielddef_setintfmt(f, intfmt);
return 0;
}
static int lupb_fielddef_settagdelim(lua_State *L) {
upb_fielddef *f = lupb_fielddef_checkmutable(L, 1);
bool is_tag_delim = lupb_checkbool(L, 2);
CHK(upb_fielddef_settagdelim(f, is_tag_delim));
return 0;
}
static const struct luaL_Reg lupb_fielddef_m[] = {
LUPB_COMMON_DEF_METHODS
{"containing_type", lupb_fielddef_containingtype},
{"containing_type_name", lupb_fielddef_containingtypename},
{"default", lupb_fielddef_default},
{"getsel", lupb_fielddef_getsel},
{"has_subdef", lupb_fielddef_hassubdef},
{"index", lupb_fielddef_index},
{"intfmt", lupb_fielddef_intfmt},
{"is_extension", lupb_fielddef_isextension},
{"istagdelim", lupb_fielddef_istagdelim},
{"label", lupb_fielddef_label},
{"lazy", lupb_fielddef_lazy},
{"name", lupb_fielddef_name},
{"number", lupb_fielddef_number},
{"packed", lupb_fielddef_packed},
{"subdef", lupb_fielddef_subdef},
{"subdef_name", lupb_fielddef_subdefname},
{"type", lupb_fielddef_type},
{"set_containing_type_name", lupb_fielddef_setcontainingtypename},
{"set_default", lupb_fielddef_setdefault},
{"set_is_extension", lupb_fielddef_setisextension},
{"set_label", lupb_fielddef_setlabel},
{"set_lazy", lupb_fielddef_setlazy},
{"set_name", lupb_fielddef_setname},
{"set_number", lupb_fielddef_setnumber},
{"set_packed", lupb_fielddef_setpacked},
{"set_subdef", lupb_fielddef_setsubdef},
{"set_subdef_name", lupb_fielddef_setsubdefname},
{"set_type", lupb_fielddef_settype},
{"set_intfmt", lupb_fielddef_setintfmt},
{"set_tagdelim", lupb_fielddef_settagdelim},
{NULL, NULL}
};
/* lupb_msgdef ****************************************************************/
typedef struct {
const upb_msgdef *md;
/* These members are initialized lazily the first time a message is created
* for this def. */
uint16_t *field_offsets;
size_t msg_size;
size_t hasbits_size;
lua_State *L;
} lupb_msgdef;
static size_t lupb_msgdef_sizeof() {
return sizeof(lupb_msgdef);
}
const upb_msgdef *lupb_msgdef_check(lua_State *L, int narg) {
return lupb_refcounted_check(L, narg, LUPB_MSGDEF);
}
lupb_msgdef *lupb_msgdef_check2(lua_State *L, int narg) {
return luaL_checkudata(L, narg, LUPB_MSGDEF);
}
static upb_msgdef *lupb_msgdef_checkmutable(lua_State *L, int narg) {
const upb_msgdef *m = lupb_msgdef_check(L, narg);
if (upb_msgdef_isfrozen(m))
luaL_error(L, "not allowed on frozen value");
return (upb_msgdef*)m;
}
static int lupb_msgdef_new(lua_State *L) {
upb_msgdef *md = upb_msgdef_new(&md);
lupb_def_pushnewrapper(L, upb_msgdef_upcast(md), &md);
return 1;
}
/* Unlike other refcounted types we need a custom __gc so that we free our field
* offsets. */
static int lupb_msgdef_gc(lua_State *L) {
lupb_msgdef *lmd = luaL_checkudata(L, 1, LUPB_MSGDEF);
free(lmd->field_offsets);
lupb_refcounted_gc(L);
return 0;
}
static void lupb_msgdef_init(lua_State *L) {
lupb_msgdef *lmd = luaL_checkudata(L, -1, LUPB_MSGDEF);
lmd->L = L;
lmd->field_offsets = NULL;
}
static int lupb_msgdef_add(lua_State *L) {
upb_msgdef *m = lupb_msgdef_checkmutable(L, 1);
upb_fielddef *f = lupb_fielddef_checkmutable(L, 2);
CHK(upb_msgdef_addfield(m, f, NULL, &status));
return 0;
}
static int lupb_msgdef_len(lua_State *L) {
const upb_msgdef *m = lupb_msgdef_check(L, 1);
lua_pushinteger(L, upb_msgdef_numfields(m));
return 1;
}
static int lupb_msgdef_field(lua_State *L) {
const upb_msgdef *m = lupb_msgdef_check(L, 1);
int type = lua_type(L, 2);
const upb_fielddef *f;
if (type == LUA_TNUMBER) {
f = upb_msgdef_itof(m, lua_tointeger(L, 2));
} else if (type == LUA_TSTRING) {
f = upb_msgdef_ntofz(m, lua_tostring(L, 2));
} else {
const char *msg = lua_pushfstring(L, "number or string expected, got %s",
luaL_typename(L, 2));
return luaL_argerror(L, 2, msg);
}
lupb_def_pushwrapper(L, upb_fielddef_upcast(f), NULL);
return 1;
}
static int lupb_msgiter_next(lua_State *L) {
upb_msg_field_iter *i = lua_touserdata(L, lua_upvalueindex(1));
if (upb_msg_field_done(i)) return 0;
lupb_def_pushwrapper(L, upb_fielddef_upcast(upb_msg_iter_field(i)), NULL);
upb_msg_field_next(i);
return 1;
}
static int lupb_msgdef_fields(lua_State *L) {
const upb_msgdef *m = lupb_msgdef_check(L, 1);
upb_msg_field_iter *i = lua_newuserdata(L, sizeof(upb_msg_field_iter));
upb_msg_field_begin(i, m);
/* Need to guarantee that the msgdef outlives the iter. */
lua_pushvalue(L, 1);
lua_pushcclosure(L, &lupb_msgiter_next, 2);
return 1;
}
static const struct luaL_Reg lupb_msgdef_mm[] = {
{"__gc", lupb_msgdef_gc},
{"__len", lupb_msgdef_len},
{NULL, NULL}
};
static const struct luaL_Reg lupb_msgdef_m[] = {
LUPB_COMMON_DEF_METHODS
{"add", lupb_msgdef_add},
{"field", lupb_msgdef_field},
{"fields", lupb_msgdef_fields},
{NULL, NULL}
};
/* lupb_enumdef ***************************************************************/
const upb_enumdef *lupb_enumdef_check(lua_State *L, int narg) {
return lupb_refcounted_check(L, narg, LUPB_ENUMDEF);
}
static upb_enumdef *lupb_enumdef_checkmutable(lua_State *L, int narg) {
const upb_enumdef *f = lupb_enumdef_check(L, narg);
if (upb_enumdef_isfrozen(f))
luaL_error(L, "not allowed on frozen value");
return (upb_enumdef*)f;
}
static int lupb_enumdef_new(lua_State *L) {
upb_enumdef *e = upb_enumdef_new(&e);
lupb_def_pushnewrapper(L, upb_enumdef_upcast(e), &e);
return 1;
}
static int lupb_enumdef_add(lua_State *L) {
upb_enumdef *e = lupb_enumdef_checkmutable(L, 1);
const char *name = lupb_checkname(L, 2);
int32_t val = lupb_checkint32(L, 3);
CHK(upb_enumdef_addval(e, name, val, &status));
return 0;
}
static int lupb_enumdef_len(lua_State *L) {
const upb_enumdef *e = lupb_enumdef_check(L, 1);
lua_pushinteger(L, upb_enumdef_numvals(e));
return 1;
}
static int lupb_enumdef_value(lua_State *L) {
const upb_enumdef *e = lupb_enumdef_check(L, 1);
int type = lua_type(L, 2);
if (type == LUA_TNUMBER) {
/* Pushes "nil" for a NULL pointer. */
int32_t key = lupb_checkint32(L, 2);
lua_pushstring(L, upb_enumdef_iton(e, key));
} else if (type == LUA_TSTRING) {
const char *key = lua_tostring(L, 2);
int32_t num;
if (upb_enumdef_ntoiz(e, key, &num)) {
lua_pushinteger(L, num);
} else {
lua_pushnil(L);
}
} else {
const char *msg = lua_pushfstring(L, "number or string expected, got %s",
luaL_typename(L, 2));
return luaL_argerror(L, 2, msg);
}
return 1;
}
static int lupb_enumiter_next(lua_State *L) {
upb_enum_iter *i = lua_touserdata(L, lua_upvalueindex(1));
if (upb_enum_done(i)) return 0;
lua_pushstring(L, upb_enum_iter_name(i));
lua_pushinteger(L, upb_enum_iter_number(i));
upb_enum_next(i);
return 2;
}
static int lupb_enumdef_values(lua_State *L) {
const upb_enumdef *e = lupb_enumdef_check(L, 1);
upb_enum_iter *i = lua_newuserdata(L, sizeof(upb_enum_iter));
upb_enum_begin(i, e);
/* Need to guarantee that the enumdef outlives the iter. */
lua_pushvalue(L, 1);
lua_pushcclosure(L, &lupb_enumiter_next, 2);
return 1;
}
static const struct luaL_Reg lupb_enumdef_mm[] = {
{"__len", lupb_enumdef_len},
{NULL, NULL}
};
static const struct luaL_Reg lupb_enumdef_m[] = {
LUPB_COMMON_DEF_METHODS
{"add", lupb_enumdef_add},
{"value", lupb_enumdef_value},
{"values", lupb_enumdef_values},
{NULL, NULL}
};
/* lupb_filedef ***************************************************************/
void lupb_filedef_pushwrapper(lua_State *L, const upb_filedef *f,
const void *ref_donor) {
lupb_refcounted_pushwrapper(L, upb_filedef_upcast(f), LUPB_FILEDEF, ref_donor,
sizeof(void *));
}
void lupb_filedef_pushnewrapper(lua_State *L, const upb_filedef *f,
const void *ref_donor) {
lupb_refcounted_pushnewrapper(L, upb_filedef_upcast(f), LUPB_FILEDEF,
ref_donor);
}
const upb_filedef *lupb_filedef_check(lua_State *L, int narg) {
return lupb_refcounted_check(L, narg, LUPB_FILEDEF);
}
static upb_filedef *lupb_filedef_checkmutable(lua_State *L, int narg) {
const upb_filedef *f = lupb_filedef_check(L, narg);
if (upb_filedef_isfrozen(f))
luaL_error(L, "not allowed on frozen value");
return (upb_filedef*)f;
}
static int lupb_filedef_new(lua_State *L) {
upb_filedef *f = upb_filedef_new(&f);
lupb_filedef_pushnewrapper(L, f, &f);
return 1;
}
static int lupb_filedef_def(lua_State *L) {
const upb_filedef *f = lupb_filedef_check(L, 1);
int index = luaL_checkint(L, 2);
const upb_def *def = upb_filedef_def(f, index);
if (!def) {
return luaL_error(L, "index out of range");
}
lupb_def_pushwrapper(L, def, NULL);
return 1;
}
static int lupb_filedef_name(lua_State *L) {
const upb_filedef *f = lupb_filedef_check(L, 1);
lua_pushstring(L, upb_filedef_name(f));
return 1;
}
static int lupb_filedef_package(lua_State *L) {
const upb_filedef *f = lupb_filedef_check(L, 1);
lua_pushstring(L, upb_filedef_package(f));
return 1;
}
static int lupb_filedef_len(lua_State *L) {
const upb_filedef *f = lupb_filedef_check(L, 1);
lua_pushinteger(L, upb_filedef_defcount(f));
return 1;
}
static int lupb_filedef_setname(lua_State *L) {
upb_filedef *f = lupb_filedef_checkmutable(L, 1);
CHK(upb_filedef_setname(f, lupb_checkname(L, 2), &status));
return 0;
}
static int lupb_filedef_setpackage(lua_State *L) {
upb_filedef *f = lupb_filedef_checkmutable(L, 1);
CHK(upb_filedef_setpackage(f, lupb_checkname(L, 2), &status));
return 0;
}
static int lupb_filedefiter_next(lua_State *L) {
const upb_filedef *f = lupb_filedef_check(L, lua_upvalueindex(1));
int type = lua_tointeger(L, lua_upvalueindex(2));
size_t i = lua_tointeger(L, lua_upvalueindex(3));
size_t n = upb_filedef_defcount(f);
for (; i < n; i++) {
const upb_def *def;
def = upb_filedef_def(f, i);
assert(def);
if (type == UPB_DEF_ANY || upb_def_type(def) == type) {
lua_pushinteger(L, i + 1);
lua_replace(L, lua_upvalueindex(3));
lupb_def_pushwrapper(L, def, NULL);
return 1;
}
}
return 0;
}
static int lupb_filedef_defs(lua_State *L) {
lupb_filedef_check(L, 1);
luaL_checkinteger(L, 2); /* Def type. Could make this optional. */
lua_pushnumber(L, 0); /* Index, starts at zero. */
lua_pushcclosure(L, &lupb_filedefiter_next, 3);
return 1;
}
static const struct luaL_Reg lupb_filedef_mm[] = {
{"__len", lupb_filedef_len},
{NULL, NULL}
};
static const struct luaL_Reg lupb_filedef_m[] = {
{"def", lupb_filedef_def},
{"defs", lupb_filedef_defs},
{"name", lupb_filedef_name},
{"package", lupb_filedef_package},
{"set_name", lupb_filedef_setname},
{"set_package", lupb_filedef_setpackage},
{NULL, NULL}
};
/* lupb_symtab ****************************************************************/
/* Inherits a ref on the symtab.
* Checks that narg is a proper lupb_symtab object. If it is, leaves its
* metatable on the stack for cache lookups/updates. */
const upb_symtab *lupb_symtab_check(lua_State *L, int narg) {
return lupb_refcounted_check(L, narg, LUPB_SYMTAB);
}
static upb_symtab *lupb_symtab_checkmutable(lua_State *L, int narg) {
const upb_symtab *s = lupb_symtab_check(L, narg);
if (upb_symtab_isfrozen(s))
luaL_error(L, "not allowed on frozen value");
return (upb_symtab*)s;
}
void lupb_symtab_pushwrapper(lua_State *L, const upb_symtab *s,
const void *ref_donor) {
lupb_refcounted_pushwrapper(L, upb_symtab_upcast(s), LUPB_SYMTAB, ref_donor,
sizeof(void *));
}
void lupb_symtab_pushnewrapper(lua_State *L, const upb_symtab *s,
const void *ref_donor) {
lupb_refcounted_pushnewrapper(L, upb_symtab_upcast(s), LUPB_SYMTAB,
ref_donor);
}
static int lupb_symtab_new(lua_State *L) {
upb_symtab *s = upb_symtab_new(&s);
lupb_symtab_pushnewrapper(L, s, &s);
return 1;
}
static int lupb_symtab_freeze(lua_State *L) {
upb_symtab_freeze(lupb_symtab_checkmutable(L, 1));
return 0;
}
static int lupb_symtab_isfrozen(lua_State *L) {
lua_pushboolean(L, upb_symtab_isfrozen(lupb_symtab_check(L, 1)));
return 1;
}
static int lupb_symtab_add(lua_State *L) {
upb_symtab *s = lupb_symtab_checkmutable(L, 1);
int n;
upb_def **defs;
luaL_checktype(L, 2, LUA_TTABLE);
/* Iterate over table twice. First iteration to count entries and
* check constraints. */
n = 0;
for (lua_pushnil(L); lua_next(L, 2); lua_pop(L, 1)) {
lupb_def_checkmutable(L, -1);
++n;
}
/* Second iteration to build deflist.
* Allocate list with lua_newuserdata() so it is anchored as a GC root in
* case any Lua functions longjmp(). */
defs = lua_newuserdata(L, n * sizeof(*defs));
n = 0;
for (lua_pushnil(L); lua_next(L, 2); lua_pop(L, 1)) {
upb_def *def = lupb_def_checkmutable(L, -1);
defs[n++] = def;
}
CHK(upb_symtab_add(s, defs, n, NULL, &status));
return 0;
}
static int lupb_symtab_addfile(lua_State *L) {
upb_symtab *s = lupb_symtab_checkmutable(L, 1);
upb_filedef *f = lupb_filedef_checkmutable(L, 2);
CHK(upb_symtab_addfile(s, f, &status));
return 0;
}
static int lupb_symtab_lookup(lua_State *L) {
const upb_symtab *s = lupb_symtab_check(L, 1);
int i;
for (i = 2; i <= lua_gettop(L); i++) {
const upb_def *def = upb_symtab_lookup(s, luaL_checkstring(L, i));
lupb_def_pushwrapper(L, def, NULL);
lua_replace(L, i);
}
return lua_gettop(L) - 1;
}
static int lupb_symtabiter_next(lua_State *L) {
upb_symtab_iter *i = lua_touserdata(L, lua_upvalueindex(1));
if (upb_symtab_done(i)) return 0;
lupb_def_pushwrapper(L, upb_symtab_iter_def(i), NULL);
upb_symtab_next(i);
return 1;
}
static int lupb_symtab_defs(lua_State *L) {
const upb_symtab *s = lupb_symtab_check(L, 1);
upb_deftype_t type = lua_gettop(L) > 1 ? luaL_checkint(L, 2) : UPB_DEF_ANY;
upb_symtab_iter *i = lua_newuserdata(L, sizeof(upb_symtab_iter));
upb_symtab_begin(i, s, type);
/* Need to guarantee that the symtab outlives the iter. */
lua_pushvalue(L, 1);
lua_pushcclosure(L, &lupb_symtabiter_next, 2);
return 1;
}
static const struct luaL_Reg lupb_symtab_m[] = {
{"add", lupb_symtab_add},
{"add_file", lupb_symtab_addfile},
{"defs", lupb_symtab_defs},
{"freeze", lupb_symtab_freeze},
{"is_frozen", lupb_symtab_isfrozen},
{"lookup", lupb_symtab_lookup},
{NULL, NULL}
};
/* lupb_array *****************************************************************/
/* A lupb_array provides a strongly-typed array.
*
* For the moment we store all values in the userdata's environment table /
* userval, for simplicity. Later we may wish to move the data into raw
* memory as both a space and time optimization
*
* Compared to regular Lua tables:
*
* - we only allow integer indices.
* - all entries must match the type of the table.
* - we do not allow "holes" in the array; you can only assign to an existing
* index or one past the end (which will grow the array by one). */
typedef struct {
uint32_t size;
upb_fieldtype_t type;
const upb_msgdef *msgdef; /* Only when type == UPB_TYPE_MESSAGE */
} lupb_array;
static lupb_array *lupb_array_check(lua_State *L, int narg) {
return luaL_checkudata(L, narg, LUPB_ARRAY);
}
static uint32_t lupb_array_checkindex(lua_State *L, int narg, uint32_t max) {
uint32_t n = lupb_checkuint32(L, narg);
if (n == 0 || n > max) { /* Lua uses 1-based indexing. :( */
luaL_error(L, "Invalid array index.");
}
return n;
}
static int lupb_array_new(lua_State *L) {
lupb_array *array = newudata_with_userval(L, sizeof(*array), LUPB_ARRAY);
array->size = 0;
if (lua_type(L, 1) == LUA_TNUMBER) {
array->type = lupb_checkfieldtype(L, 1);
if (array->type == UPB_TYPE_MESSAGE) {
return luaL_error(
L, "For message arrays construct with the specific message type.");
}
} else {
array->type = UPB_TYPE_MESSAGE;
array->msgdef = lupb_msgdef_check(L, 1);
/* Store a reference to this msgdef in the environment table to ensure it
* outlives this array. */
lua_getuservalue(L, -1);
lua_pushvalue(L, 1);
lua_rawseti(L, -2, 0);
lua_pop(L, 1); /* Pop userval. */
}
return 1;
}
static int lupb_array_newindex(lua_State *L) {
lupb_array *array = lupb_array_check(L, 1);
uint32_t n = lupb_array_checkindex(L, 2, array->size + 1);
if (n == array->size + 1) {
array->size++;
}
if (array->type == UPB_TYPE_MESSAGE) {
if (array->msgdef != lupb_msg_checkdef(L, 3)) {
return luaL_error(L, "Tried to assign wrong message type.");
}
} else {
lupb_checkval(L, 3, array->type);
}
/* Write value to userval table. */
lua_getuservalue(L, 1);
lua_pushvalue(L, 3);
lua_rawseti(L, -2, n);
return 0; /* 1 for chained assignments? */
}
static int lupb_array_index(lua_State *L) {
lupb_array *array = lupb_array_check(L, 1);
uint32_t n = lupb_array_checkindex(L, 2, array->size);
lua_getuservalue(L, 1);
lua_rawgeti(L, -1, n);
return 1;
}
static int lupb_array_len(lua_State *L) {
lupb_array *array = lupb_array_check(L, 1);
lua_pushnumber(L, array->size);
return 1;
}
static const struct luaL_Reg lupb_array_mm[] = {
{"__index", lupb_array_index},
{"__len", lupb_array_len},
{"__newindex", lupb_array_newindex},
{NULL, NULL}
};
/* lupb_msg **************************************************************/
/* A lupb_msg is a userdata where:
*
* - the userdata's memory contains hasbits and primitive fields.
* - the userdata's environment table / uservalue contains references to string
* fields, submessage fields, and array fields. */
typedef struct {
const lupb_msgdef *lmd;
/* Data follows, in a flat buffer. */
} lupb_msg;
#define MSGDEF_INDEX 0
static bool in_userval(const upb_fielddef *f) {
return upb_fielddef_isseq(f) || upb_fielddef_issubmsg(f) ||
upb_fielddef_isstring(f);
}
static size_t lupb_sizeof(lua_State *L, const upb_fielddef *f) {
switch (upb_fielddef_type(f)) {
case UPB_TYPE_BOOL:
return 1;
case UPB_TYPE_INT32:
case UPB_TYPE_UINT32:
case UPB_TYPE_ENUM:
case UPB_TYPE_FLOAT:
return 4;
case UPB_TYPE_INT64:
case UPB_TYPE_UINT64:
case UPB_TYPE_DOUBLE:
return 8;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
case UPB_TYPE_MESSAGE:
break;
}
lupb_assert(L, false);
return 0;
}
static int div_round_up(size_t n, size_t d) {
int ret = n / d;
/* If there was a positive remainder, then the result was rounded down and we
* need to compensate by adding one. */
if (n % d > 0) ++ret;
return ret;
}
static size_t align_up(size_t val, size_t align) {
return val % align == 0 ? val : val + align - (val % align);
}
/* If we always read/write as a consistent type to each value, this shouldn't
* violate aliasing.
*
* Note that the slightly prettier option of:
*
* *(type*)(&msg->data[ofs])
*
* ...is potentially more questionable wrt the C standard and aliasing.
* Does the expression &msg->data[ofs] "access the stored value"? If so,
* this would violate aliasing. So instead we use the expression:
*
* (char*)msg + sizeof(lupb_msg) + ofs
*
* ...which unambigiously is doing nothing but calculating a pointer address. */
#define CHARPTR_AT(msg, ofs) ((char*)msg + sizeof(lupb_msg) + ofs)
#define DEREF(msg, ofs, type) *(type*)CHARPTR_AT(msg, ofs)
lupb_msg *lupb_msg_check(lua_State *L, int narg) {
lupb_msg *msg = luaL_checkudata(L, narg, LUPB_MSG);
if (!msg->lmd) luaL_error(L, "called into dead msg");
return msg;
}
const upb_msgdef *lupb_msg_checkdef(lua_State *L, int narg) {
return lupb_msg_check(L, narg)->lmd->md;
}
static const upb_fielddef *lupb_msg_checkfield(lua_State *L,
const lupb_msgdef *lmd,
int fieldarg) {
size_t len;
const char *fieldname = luaL_checklstring(L, fieldarg, &len);
const upb_fielddef *f = upb_msgdef_ntof(lmd->md, fieldname, len);
if (!f) {
const char *msg = lua_pushfstring(L, "no such field: %s", fieldname);
luaL_argerror(L, fieldarg, msg);
return NULL; /* Never reached. */
}
return f;
}
/* Assigns offsets for storing data in instances of messages for this type, if
* they have not already been assigned. "narg" should be the stack location of
* a Lua msgdef object. It should be frozen (if it is not, we will throw an
* error). It should not throw errors in any other case, since we may have
* values on our stack that would leak if we longjmp'd across them.
*
* TODO(haberman): (if we want to avoid this and be robust against even lua
* errors due to OOM, we should stop using upb_handlers_newfrozen() and
* implement it ourselves with a Lua table as cache, since that would get
* cleaned up properly on error). */
static lupb_msgdef *lupb_msg_assignoffsets(lua_State *L, int narg) {
int idx;
upb_msg_field_iter i;
lupb_msgdef *lmd = lupb_msgdef_check2(L, narg);
if (!upb_msgdef_isfrozen(lmd->md))
luaL_error(L, "msgdef must be frozen");
if (lmd->field_offsets) {
/* Already assigned. */
return lmd;
}
{
int n = upb_msgdef_numfields(lmd->md);
uint16_t *offsets = malloc(sizeof(*offsets) * n);
/* Offset with the raw data part; starts with hasbits. */
size_t hasbits_size = div_round_up(n, 8);
size_t data_ofs = hasbits_size;
/* Index within the userval.
* Starts at one to not collide with MSGDEF_INDEX. */
size_t userval_idx = 1;
/* Assign offsets. */
for (upb_msg_field_begin(&i, lmd->md);
!upb_msg_field_done(&i);
upb_msg_field_next(&i)) {
upb_fielddef *f = upb_msg_iter_field(&i);
if (in_userval(f)) {
offsets[upb_fielddef_index(f)] = userval_idx++;
} else {
size_t size = lupb_sizeof(L, f);
data_ofs = align_up(data_ofs, size);
offsets[upb_fielddef_index(f)] = data_ofs;
data_ofs += size;
}
}
lmd->field_offsets = offsets;
lmd->msg_size = sizeof(lupb_msg) + data_ofs;
lmd->hasbits_size = hasbits_size;
}
/* Now recursively assign offsets for all submessages, and also add them to
* the uservalue to ensure that all the lupb_msgdef objects for our
* submessages outlive us. This is particularly important if/when we build
* handlers to populate this msgdef. */
lua_pushvalue(L, narg);
lua_newtable(L); /* This will be our userval. */
idx = 1;
for (upb_msg_field_begin(&i, lmd->md);
!upb_msg_field_done(&i);
upb_msg_field_next(&i)) {
upb_fielddef *f = upb_msg_iter_field(&i);
if (upb_fielddef_type(f) == UPB_TYPE_MESSAGE) {
bool created = lupb_def_pushwrapper(L, upb_fielddef_subdef(f), NULL);
UPB_ASSERT_VAR(created, !created);
lupb_msg_assignoffsets(L, -1);
lua_rawseti(L, -2, idx++); /* Append to uservalue. */
}
}
lua_setuservalue(L, -2);
lua_pop(L, 1); /* copy of msgdef */
return lmd;
}
void lupb_msg_pushnew(lua_State *L, int narg) {
lupb_msgdef *lmd = lupb_msg_assignoffsets(L, narg);
lupb_msg *msg;
/* Add passed-in MessageDef to a table which will become the msg's userval. */
lua_pushvalue(L, narg);
lua_newtable(L);
lua_pushvalue(L, narg);
lua_rawseti(L, -2, MSGDEF_INDEX);
msg = newudata_with_userval(L, lmd->msg_size, LUPB_MSG);
memset(msg, 0, lmd->msg_size);
/* Create a msg->msgdef reference, both:
* 1. a pointer in the userdata itself (for easy access) and */
msg->lmd = lmd;
/* 2. a reference in Lua-space from the msg's uservalue to the messagedef
* wrapper object (so the msgdef wrapper object will always outlive us,
* GC-wise). */
lua_pushvalue(L, -2); /* Push the table from before. */
lua_setuservalue(L, -2); /* Pop table, now msg is at top again. */
lua_remove(L, -2); /* Remove table, so new message is only new val. */
}
static int lupb_msg_new(lua_State *L) {
lupb_msg_pushnew(L, 1);
return 1;
}
static bool lupb_msg_has(const lupb_msg *msg, const upb_fielddef *f) {
uint16_t idx = upb_fielddef_index(f);
return *CHARPTR_AT(msg, idx / 8) & (1 << (idx % 8));
}
static void lupb_msg_set(lupb_msg *msg, const upb_fielddef *f) {
uint16_t idx = upb_fielddef_index(f);
*CHARPTR_AT(msg, idx / 8) |= (1 << (idx % 8));
}
static int lupb_msg_index(lua_State *L) {
lupb_msg *msg = lupb_msg_check(L, 1);
const upb_fielddef *f = lupb_msg_checkfield(L, msg->lmd, 2);
int ofs;
if (!upb_fielddef_isseq(f) && !lupb_msg_has(msg, f)) {
lua_pushnil(L);
return 1;
}
ofs = msg->lmd->field_offsets[upb_fielddef_index(f)];
if (in_userval(f)) {
lua_getuservalue(L, 1);
lua_pushinteger(L, ofs);
lua_rawget(L, -2);
} else {
switch (upb_fielddef_type(f)) {
case UPB_TYPE_FLOAT:
lupb_pushfloat(L, DEREF(msg, ofs, float));
break;
case UPB_TYPE_DOUBLE:
lupb_pushdouble(L, DEREF(msg, ofs, double));
break;
case UPB_TYPE_BOOL:
lua_pushboolean(L, DEREF(msg, ofs, bool));
break;
case UPB_TYPE_ENUM:
case UPB_TYPE_INT32:
lupb_pushint32(L, DEREF(msg, ofs, int32_t));
break;
case UPB_TYPE_UINT32:
lupb_pushuint32(L, DEREF(msg, ofs, uint32_t));
break;
case UPB_TYPE_INT64:
if (LUA_VERSION_NUM < 503) {
/* Check value? Lua < 5.3.0 has no native integer support, lua_Number
* is probably double which can't exactly represent large int64s. */
}
lupb_pushint64(L, DEREF(msg, ofs, int64_t));
break;
case UPB_TYPE_UINT64:
if (LUA_VERSION_NUM < 503) {
/* Check value? Lua < 5.3.0 has no native integer support, lua_Number
* is probably double which can't exactly represent large uint64s. */
}
lupb_pushuint64(L, DEREF(msg, ofs, uint64_t));
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
case UPB_TYPE_MESSAGE:
lupb_assert(L, false);
break;
}
}
return 1;
}
int lupb_msg_newindex(lua_State *L) {
lupb_msg *msg = lupb_msg_check(L, 1);
const upb_fielddef *f = lupb_msg_checkfield(L, msg->lmd, 2);
int ofs;
lupb_msg_set(msg, f);
ofs = msg->lmd->field_offsets[upb_fielddef_index(f)];
if (in_userval(f)) {
/* Type-check and then store in the userval. */
if (upb_fielddef_isseq(f)) {
lupb_array *array = lupb_array_check(L, 3);
if (array->type != upb_fielddef_type(f) ||
(array->type == UPB_TYPE_MESSAGE &&
array->msgdef != upb_fielddef_msgsubdef(f))) {
return luaL_error(L, "Array type mismatch");
}
} else if (upb_fielddef_isstring(f)) {
lupb_checkstring(L, 3);
} else {
if (lupb_msg_checkdef(L, 3) != upb_fielddef_msgsubdef(f)) {
return luaL_error(L, "Message type mismatch");
}
}
lua_getuservalue(L, 1);
lua_pushvalue(L, 3);
lua_rawseti(L, -2, ofs);
} else {
switch (upb_fielddef_type(f)) {
case UPB_TYPE_FLOAT:
DEREF(msg, ofs, float) = lupb_checkfloat(L, 3);
break;
case UPB_TYPE_DOUBLE:
DEREF(msg, ofs, double) = lupb_checkdouble(L, 3);
break;
case UPB_TYPE_ENUM:
case UPB_TYPE_INT32:
DEREF(msg, ofs, int32_t) = lupb_checkint32(L, 3);
break;
case UPB_TYPE_UINT32:
DEREF(msg, ofs, uint32_t) = lupb_checkuint32(L, 3);
break;
case UPB_TYPE_INT64:
DEREF(msg, ofs, int64_t) = lupb_checkint64(L, 3);
break;
case UPB_TYPE_UINT64:
DEREF(msg, ofs, uint64_t) = lupb_checkuint64(L, 3);
break;
case UPB_TYPE_BOOL:
DEREF(msg, ofs, bool) = lupb_checkbool(L, 3);
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
case UPB_TYPE_MESSAGE:
lupb_assert(L, false);
}
}
return 0; /* 1 for chained assignments? */
}
static const struct luaL_Reg lupb_msg_mm[] = {
{"__index", lupb_msg_index},
{"__newindex", lupb_msg_newindex},
{NULL, NULL}
};
/* lupb_msg populating handlers ***********************************************/
/* NOTE: doesn't support repeated or submessage fields yet. Coming soon. */
typedef struct {
uint32_t ofs;
uint32_t hasbit;
} lupb_handlerdata;
static void lupb_sethasbit(lupb_msg *msg, uint32_t hasbit) {
*CHARPTR_AT(msg, hasbit / 8) |= 1 << (hasbit % 8);
}
static size_t strhandler(void *closure, const void *hd, const char *str,
size_t len, const upb_bufhandle *handle) {
lupb_msg *msg = closure;
const lupb_handlerdata *data = hd;
lua_State *L = msg->lmd->L;
UPB_UNUSED(handle);
lua_pushlstring(L, str, len);
lua_rawseti(L, -2, data->ofs);
lupb_sethasbit(msg, data->hasbit);
return len;
}
const void *newhandlerdata(upb_handlers *h, uint32_t ofs, uint32_t hasbit) {
lupb_handlerdata *data = malloc(sizeof(*data));
data->ofs = ofs;
data->hasbit = hasbit;
upb_handlers_addcleanup(h, data, free);
return data;
}
void callback(const void *closure, upb_handlers *h) {
lua_State *L = (lua_State*)closure;
lupb_msgdef *lmd;
upb_msg_field_iter i;
lupb_def_pushwrapper(L, upb_msgdef_upcast(upb_handlers_msgdef(h)), NULL);
lmd = lupb_msg_assignoffsets(L, -1);
upb_msg_field_begin(&i, upb_handlers_msgdef(h));
for (; !upb_msg_field_done(&i); upb_msg_field_next(&i)) {
upb_fielddef *f = upb_msg_iter_field(&i);
int hasbit = upb_fielddef_index(f);
uint16_t ofs = lmd->field_offsets[upb_fielddef_index(f)];
if (upb_fielddef_isseq(f)) {
luaL_error(L, "Doesn't support repeated fields yet.");
} else {
switch (upb_fielddef_type(f)) {
case UPB_TYPE_BOOL:
case UPB_TYPE_INT32:
case UPB_TYPE_UINT32:
case UPB_TYPE_ENUM:
case UPB_TYPE_FLOAT:
case UPB_TYPE_INT64:
case UPB_TYPE_UINT64:
case UPB_TYPE_DOUBLE:
hasbit += sizeof(lupb_msg) * 8;
ofs += sizeof(lupb_msg);
upb_shim_set(h, f, ofs, hasbit);
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES: {
upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;
upb_handlerattr_sethandlerdata(&attr, newhandlerdata(h, ofs, hasbit));
/* XXX: does't currently handle split buffers. */
upb_handlers_setstring(h, f, strhandler, &attr);
upb_handlerattr_uninit(&attr);
break;
}
case UPB_TYPE_MESSAGE:
luaL_error(L, "Doesn't support submessages yet.");
break;
}
}
}
lua_pop(L, 1); /* msgdef wrapper */
}
const upb_handlers *lupb_msg_newwritehandlers(lua_State *L, int narg,
const void *owner) {
lupb_msgdef *lmd = lupb_msg_assignoffsets(L, narg);
return upb_handlers_newfrozen(lmd->md, owner, callback, L);
}
/* lupb toplevel **************************************************************/
static int lupb_freeze(lua_State *L) {
int n = lua_gettop(L);
int i;
/* Scratch memory; lua_newuserdata() anchors it as a GC root in case any Lua
* functions fail. */
upb_def **defs = lua_newuserdata(L, n * sizeof(upb_def*));
for (i = 0; i < n; i++) {
/* Could allow an array of defs here also. */
defs[i] = lupb_def_checkmutable(L, i + 1);
}
CHK(upb_def_freeze(defs, n, &status));
return 0;
}
/* This is a *temporary* API that will be removed once pending refactorings are
* complete (it does not belong here in core because it depends on both
* the descriptor.proto schema and the protobuf binary format. */
static int lupb_loaddescriptor(lua_State *L) {
size_t len;
const char *str = luaL_checklstring(L, 1, &len);
size_t i;
upb_filedef **files = NULL;
CHK(files = upb_loaddescriptor(str, len, &files, &status));
lua_newtable(L);
for (i = 1; *files; i++, files++) {
lupb_filedef_pushnewrapper(L, *files, &files);
lua_rawseti(L, -2, i);
}
return 1;
}
static const struct luaL_Reg lupb_toplevel_m[] = {
{"Array", lupb_array_new},
{"EnumDef", lupb_enumdef_new},
{"FieldDef", lupb_fielddef_new},
{"FileDef", lupb_filedef_new},
{"Message", lupb_msg_new},
{"MessageDef", lupb_msgdef_new},
{"SymbolTable", lupb_symtab_new},
{"freeze", lupb_freeze},
{"load_descriptor", lupb_loaddescriptor},
{NULL, NULL}
};
void lupb_register_type(lua_State *L, const char *name, const luaL_Reg *m,
const luaL_Reg *mm, bool refcount_gc) {
luaL_newmetatable(L, name);
if (mm) {
lupb_setfuncs(L, mm);
}
if (refcount_gc) {
lupb_setfuncs(L, lupb_refcounted_mm);
}
if (m) {
/* Methods go in the mt's __index method. This implies that you can'
* implement __index and also have methods. */
lua_getfield(L, -1, "__index");
lupb_assert(L, lua_isnil(L, -1));
lua_pop(L, 1);
lua_createtable(L, 0, 0);
lupb_setfuncs(L, m);
lua_setfield(L, -2, "__index");
}
lua_pop(L, 1); /* The mt. */
}
static void lupb_setfieldi(lua_State *L, const char *field, int i) {
lua_pushinteger(L, i);
lua_setfield(L, -2, field);
}
int luaopen_upb_c(lua_State *L) {
static char module_key;
if (lupb_openlib(L, &module_key, "upb_c", lupb_toplevel_m)) {
return 1;
}
/* Non-refcounted types. */
lupb_register_type(L, LUPB_ARRAY, NULL, lupb_array_mm, false);
lupb_register_type(L, LUPB_MSG, NULL, lupb_msg_mm, false);
/* Refcounted types. */
lupb_register_type(L, LUPB_ENUMDEF, lupb_enumdef_m, lupb_enumdef_mm, true);
lupb_register_type(L, LUPB_FIELDDEF, lupb_fielddef_m, NULL, true);
lupb_register_type(L, LUPB_FILEDEF, lupb_filedef_m, lupb_filedef_mm, true);
lupb_register_type(L, LUPB_SYMTAB, lupb_symtab_m, NULL, true);
/* Refcounted but with custom __gc. */
lupb_register_type(L, LUPB_MSGDEF, lupb_msgdef_m, lupb_msgdef_mm, false);
/* Create our object cache. */
lua_newtable(L);
lua_createtable(L, 0, 1); /* Cache metatable. */
lua_pushstring(L, "v"); /* Values are weak. */
lua_setfield(L, -2, "__mode");
lua_setmetatable(L, -2);
lua_setfield(L, LUA_REGISTRYINDEX, LUPB_OBJCACHE);
/* Register constants. */
lupb_setfieldi(L, "LABEL_OPTIONAL", UPB_LABEL_OPTIONAL);
lupb_setfieldi(L, "LABEL_REQUIRED", UPB_LABEL_REQUIRED);
lupb_setfieldi(L, "LABEL_REPEATED", UPB_LABEL_REPEATED);
lupb_setfieldi(L, "TYPE_DOUBLE", UPB_TYPE_DOUBLE);
lupb_setfieldi(L, "TYPE_FLOAT", UPB_TYPE_FLOAT);
lupb_setfieldi(L, "TYPE_INT64", UPB_TYPE_INT64);
lupb_setfieldi(L, "TYPE_UINT64", UPB_TYPE_UINT64);
lupb_setfieldi(L, "TYPE_INT32", UPB_TYPE_INT32);
lupb_setfieldi(L, "TYPE_BOOL", UPB_TYPE_BOOL);
lupb_setfieldi(L, "TYPE_STRING", UPB_TYPE_STRING);
lupb_setfieldi(L, "TYPE_MESSAGE", UPB_TYPE_MESSAGE);
lupb_setfieldi(L, "TYPE_BYTES", UPB_TYPE_BYTES);
lupb_setfieldi(L, "TYPE_UINT32", UPB_TYPE_UINT32);
lupb_setfieldi(L, "TYPE_ENUM", UPB_TYPE_ENUM);
lupb_setfieldi(L, "INTFMT_VARIABLE", UPB_INTFMT_VARIABLE);
lupb_setfieldi(L, "INTFMT_FIXED", UPB_INTFMT_FIXED);
lupb_setfieldi(L, "INTFMT_ZIGZAG", UPB_INTFMT_ZIGZAG);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_DOUBLE", UPB_DESCRIPTOR_TYPE_DOUBLE);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_FLOAT", UPB_DESCRIPTOR_TYPE_FLOAT);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_INT64", UPB_DESCRIPTOR_TYPE_INT64);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_UINT64", UPB_DESCRIPTOR_TYPE_UINT64);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_INT32", UPB_DESCRIPTOR_TYPE_INT32);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_FIXED64", UPB_DESCRIPTOR_TYPE_FIXED64);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_FIXED32", UPB_DESCRIPTOR_TYPE_FIXED32);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_BOOL", UPB_DESCRIPTOR_TYPE_BOOL);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_STRING", UPB_DESCRIPTOR_TYPE_STRING);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_GROUP", UPB_DESCRIPTOR_TYPE_GROUP);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_MESSAGE", UPB_DESCRIPTOR_TYPE_MESSAGE);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_BYTES", UPB_DESCRIPTOR_TYPE_BYTES);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_UINT32", UPB_DESCRIPTOR_TYPE_UINT32);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_ENUM", UPB_DESCRIPTOR_TYPE_ENUM);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_SFIXED32", UPB_DESCRIPTOR_TYPE_SFIXED32);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_SFIXED64", UPB_DESCRIPTOR_TYPE_SFIXED64);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_SINT32", UPB_DESCRIPTOR_TYPE_SINT32);
lupb_setfieldi(L, "DESCRIPTOR_TYPE_SINT64", UPB_DESCRIPTOR_TYPE_SINT64);
lupb_setfieldi(L, "DEF_MSG", UPB_DEF_MSG);
lupb_setfieldi(L, "DEF_FIELD", UPB_DEF_FIELD);
lupb_setfieldi(L, "DEF_ENUM", UPB_DEF_ENUM);
lupb_setfieldi(L, "DEF_SERVICE", UPB_DEF_SERVICE);
lupb_setfieldi(L, "DEF_ANY", UPB_DEF_ANY);
lupb_setfieldi(L, "HANDLER_INT32", UPB_HANDLER_INT32);
lupb_setfieldi(L, "HANDLER_INT64", UPB_HANDLER_INT64);
lupb_setfieldi(L, "HANDLER_UINT32", UPB_HANDLER_UINT32);
lupb_setfieldi(L, "HANDLER_UINT64", UPB_HANDLER_UINT64);
lupb_setfieldi(L, "HANDLER_FLOAT", UPB_HANDLER_FLOAT);
lupb_setfieldi(L, "HANDLER_DOUBLE", UPB_HANDLER_DOUBLE);
lupb_setfieldi(L, "HANDLER_BOOL", UPB_HANDLER_BOOL);
lupb_setfieldi(L, "HANDLER_STARTSTR", UPB_HANDLER_STARTSTR);
lupb_setfieldi(L, "HANDLER_STRING", UPB_HANDLER_STRING);
lupb_setfieldi(L, "HANDLER_ENDSTR", UPB_HANDLER_ENDSTR);
lupb_setfieldi(L, "HANDLER_STARTSUBMSG", UPB_HANDLER_STARTSUBMSG);
lupb_setfieldi(L, "HANDLER_ENDSUBMSG", UPB_HANDLER_ENDSUBMSG);
lupb_setfieldi(L, "HANDLER_STARTSEQ", UPB_HANDLER_STARTSEQ);
lupb_setfieldi(L, "HANDLER_ENDSEQ", UPB_HANDLER_ENDSEQ);
return 1; /* Return package table. */
}