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Copy pathLuaWrapper.cpp
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1877 lines (1544 loc) · 52.3 KB
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/*
https://github.com/peterix/dfhack
Copyright (c) 2009-2012 Petr Mrázek (peterix@gmail.com)
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.
Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
*/
#include "Internal.h"
#include <string>
#include <vector>
#include <map>
#include <cinttypes>
#include "MemAccess.h"
#include "Core.h"
#include "VersionInfo.h"
// must be last due to MS stupidity
#include "DataDefs.h"
#include "DataIdentity.h"
#include "LuaWrapper.h"
#include "LuaTools.h"
#include "MiscUtils.h"
#include <lua.h>
#include <lauxlib.h>
using namespace DFHack;
using namespace DFHack::LuaWrapper;
/**
* Report an error while accessing a field (index = field name).
*/
[[noreturn]] void LuaWrapper::field_error(lua_State *state, int index, const char *err, const char *mode)
{
if (lua_islightuserdata(state, UPVAL_METATABLE))
lua_pushstring(state, "(global)");
else
lua_getfield(state, UPVAL_METATABLE, "__metatable");
const char *cname = lua_tostring(state, -1);
const char *fname = index ? lua_tostring(state, index) : "*";
luaL_error(state, "Cannot %s field %s.%s: %s.",
mode, (cname ? cname : "?"), (fname ? fname : "?"), err);
std::abort(); // should never be reached but makes gcc happy
}
/* */
[[noreturn]] static int change_error(lua_State *state)
{
luaL_error(state, "Attempt to change a read-only table.\n");
std::abort(); // should never be reached but makes gcc happy
}
/**
* Wrap a table so that it can't be modified.
*/
static void freeze_table(lua_State *state, bool leave_metatable = false, const char *name = NULL)
{
// rv = {}; setmetatable(rv, { __index = in, __newindex = change_error, __metatable = name })
int base = lua_gettop(state);
lua_newtable(state);
lua_swap(state);
lua_setfield(state, base, "__index");
lua_getfield(state, LUA_REGISTRYINDEX, DFHACK_CHANGEERROR_NAME);
lua_setfield(state, base, "__newindex");
lua_newtable(state);
lua_swap(state);
lua_dup(state);
lua_setmetatable(state, base);
if (name)
{
lua_pushstring(state, name);
lua_setfield(state, -2, "__metatable");
}
// result: [frozen table] [metatable]
if (!leave_metatable)
lua_pop(state, 1);
}
static void LookupInTable(lua_State *state, LuaToken *tname)
{
lua_rawgetp(state, LUA_REGISTRYINDEX, tname);
lua_swap(state);
lua_rawget(state, -2);
lua_remove(state, -2);
}
/**
* Look up the key on the stack in DFHACK_TYPETABLE;
* if found, put result on the stack and return true.
*/
bool LuaWrapper::LookupTypeInfo(lua_State *state, bool in_method)
{
// stack: [lookup key]
if (in_method)
{
lua_rawget(state, UPVAL_TYPETABLE);
}
else
{
LookupInTable(state, &DFHACK_TYPETABLE_TOKEN);
}
// stack: [info]
if (lua_isnil(state, -1))
{
lua_pop(state, 1);
return false;
}
else
return true;
}
void LuaWrapper::LookupInTable(lua_State *state, const void *id, LuaToken *tname)
{
lua_rawgetp(state, LUA_REGISTRYINDEX, tname);
lua_rawgetp(state, -1, id);
lua_remove(state, -2);
}
void LuaWrapper::SaveInTable(lua_State *state, void *node, LuaToken *tname)
{
// stack: [info]
lua_rawgetp(state, LUA_REGISTRYINDEX, tname);
lua_pushvalue(state, -2);
lua_rawsetp(state, -2, node);
lua_pushvalue(state, -2);
lua_pushlightuserdata(state, node);
lua_rawset(state, -3);
lua_pop(state, 1);
// stack: [info]
}
void LuaWrapper::SaveTypeInfo(lua_State *state, void *node)
{
SaveInTable(state, node, &DFHACK_TYPETABLE_TOKEN);
}
static void BuildTypeMetatable(lua_State *state, const type_identity *type);
/**
* Push the pointer as DF object ref using metatable on the stack.
*/
void LuaWrapper::push_object_ref(lua_State *state, void *ptr)
{
// stack: [metatable]
void* stg = lua_newuserdata(state, sizeof(DFRefHeader));
new (stg) DFRefHeader
{
.ptr = ptr,
.field_info = NULL,
.tag_ptr = NULL,
.tag_identity = NULL,
.tag_attr = NULL,
};
lua_swap(state);
lua_setmetatable(state, -2);
// stack: [userdata]
}
DFRefHeader *LuaWrapper::get_object_ref_header(lua_State *state, int val_index)
{
assert(!lua_islightuserdata(state, val_index));
auto ref = (DFRefHeader*)lua_touserdata(state, val_index);
return ref;
}
void *LuaWrapper::get_object_ref(lua_State *state, int val_index)
{
return get_object_ref_header(state, val_index)->ptr;
}
/**
* Push the pointer using given identity.
*/
void LuaWrapper::push_object_internal(lua_State *state, const type_identity *type, void *ptr, bool in_method)
{
/*
* If NULL pointer or no type, push something simple
*/
if (!ptr || !type)
{
if (!ptr)
lua_pushnil(state);
else
lua_pushlightuserdata(state, ptr);
return;
}
/*
* Resolve actual class using vtable
*/
if (type->type() == IDTYPE_CLASS)
{
const virtual_identity *class_vid = virtual_identity::get(virtual_ptr(ptr));
if (class_vid)
type = class_vid;
}
/*
* Resolve metatable by identity, and push the object
*/
lua_pushlightuserdata(state, const_cast<type_identity*>(type)); // () -> type
if (!LookupTypeInfo(state, in_method)) // type -> metatable?
BuildTypeMetatable(state, type); // () -> metatable
push_object_ref(state, ptr); // metatable -> userdata
}
static void fetch_container_details(lua_State *state, int meta, const type_identity **pitem, int *pcount)
{
if (!meta) return;
lua_getfield(state, meta, "_field_identity");
*pitem = (type_identity*)lua_touserdata(state, -1);
lua_pop(state, 1);
if (pcount)
{
lua_getfield(state, meta, "_count");
if (lua_isnumber(state, -1))
*pcount = lua_tointeger(state, -1);
lua_pop(state, 1);
}
}
/**
* Check if type1 and type2 are compatible, possibly using additional metatable data.
*/
bool LuaWrapper::is_type_compatible(lua_State *state, const type_identity *type1, int meta1,
const type_identity *type2, int meta2, bool exact_equal)
{
if (type1 == type2)
return true;
if (!exact_equal && !type1)
return true;
if (!type1 || !type2)
return false;
auto t1 = type1->type();
if (t1 != type2->type())
return false;
switch (t1)
{
case IDTYPE_POINTER:
return is_type_compatible(state,
((const pointer_identity*)type1)->getTarget(), 0,
((const pointer_identity*)type2)->getTarget(), 0,
exact_equal);
break;
case IDTYPE_BUFFER:
{
auto b1 = (const df::buffer_container_identity*)type1;
auto b2 = (const df::buffer_container_identity*)type2;
const type_identity *item1 = b1->getItemType(), *item2 = b2->getItemType();
int count1 = b1->getSize(), count2 = b2->getSize();
fetch_container_details(state, meta1, &item1, &count1);
fetch_container_details(state, meta2, &item2, &count2);
return item1 && item2 && count1 == count2 &&
is_type_compatible(state, item1, 0, item2, 0, true);
}
case IDTYPE_STL_PTR_VECTOR:
{
auto b1 = (const df::stl_ptr_vector_identity*)type1;
auto b2 = (const df::stl_ptr_vector_identity*)type2;
const type_identity *item1 = b1->getItemType(), *item2 = b2->getItemType();
fetch_container_details(state, meta1, &item1, NULL);
fetch_container_details(state, meta1, &item2, NULL);
return is_type_compatible(state, item1, 0, item2, 0, exact_equal);
}
case IDTYPE_STRUCT:
case IDTYPE_UNION:
case IDTYPE_CLASS:
{
auto b1 = (struct_identity*)type1;
auto b2 = (struct_identity*)type2;
return (!exact_equal && b1->is_subclass(b2));
}
default:
return false;
}
}
static bool is_type_compatible(lua_State *state, const type_identity *type1, int meta1,
int meta2, bool exact_equal)
{
lua_rawgetp(state, meta2, &DFHACK_IDENTITY_FIELD_TOKEN);
auto type2 = (type_identity*)lua_touserdata(state, -1);
lua_pop(state, 1);
return is_type_compatible(state, type1, meta1, type2, meta2, exact_equal);
}
static bool is_type_compatible(lua_State *state, int meta1, int meta2, bool exact_equal)
{
if (lua_rawequal(state, meta1, meta2))
return true;
lua_rawgetp(state, meta1, &DFHACK_IDENTITY_FIELD_TOKEN);
auto type1 = (type_identity*)lua_touserdata(state, -1);
lua_pop(state, 1);
return is_type_compatible(state, type1, meta1, meta2, exact_equal);
}
/**
* Verify that the value matches the identity, and return ptr if so.
*/
void *LuaWrapper::get_object_internal(lua_State *state, const type_identity *type, int val_index, bool exact_type, bool in_method)
{
/*
* Non-userdata results in NULL; nil for NULL gets handled here too.
*/
if (!lua_isuserdata(state, val_index))
return NULL;
/*
* Light user data is allowed with null type; otherwise bail out.
*/
if (!lua_getmetatable(state, val_index)) // () -> metatable?
{
if (!type && lua_islightuserdata(state, val_index))
return lua_touserdata(state, val_index);
return NULL;
}
/*
* Verify that the metatable is known, and refers to the correct type.
* Here doing reverse lookup of identity by metatable.
*/
if (!LookupTypeInfo(state, in_method)) // metatable -> type?
return NULL;
if (type && lua_touserdata(state, -1) != type)
{
/*
* If valid but different type, do an intelligent comparison.
*/
lua_pop(state, 1); // type -> ()
lua_getmetatable(state, val_index);
if (!is_type_compatible(state, type, 0, lua_gettop(state), exact_type))
{
lua_pop(state, 1); // metatable -> ()
return NULL;
}
}
lua_pop(state, 1); // type -> ()
/*
* Finally decode the reference.
*/
return get_object_ref(state, val_index);
}
/**
* Check if the object and metatable are a valid DF reference or type.
*/
static bool is_valid_metatable(lua_State *state, int objidx, int metaidx)
{
// Verify object type validity
if (lua_isuserdata(state, objidx))
{
lua_pushvalue(state, metaidx);
lua_rawget(state, UPVAL_TYPETABLE);
}
else
{
lua_pushvalue(state, objidx);
LookupInTable(state, &DFHACK_TYPEID_TABLE_TOKEN);
}
bool ok = !lua_isnil(state, -1);
lua_pop(state, 1);
return ok;
}
bool Lua::IsDFNull(lua_State *state, int val_index)
{
if (lua_isnil(state, val_index))
return true;
if (lua_islightuserdata(state, val_index))
return lua_touserdata(state, val_index) == NULL;
return false;
}
Lua::ObjectClass Lua::IsDFObject(lua_State *state, int val_index)
{
if (lua_isnil(state, val_index))
return Lua::OBJ_NULL;
if (lua_islightuserdata(state, val_index))
return lua_touserdata(state, val_index) ? Lua::OBJ_VOIDPTR : OBJ_NULL;
Lua::ObjectClass cls;
if (lua_istable(state, val_index))
{
cls = Lua::OBJ_TYPE;
lua_pushvalue(state, val_index);
LookupInTable(state, &DFHACK_TYPEID_TABLE_TOKEN);
}
else if (lua_isuserdata(state, val_index))
{
if (!lua_getmetatable(state, val_index))
return Lua::OBJ_INVALID;
cls = Lua::OBJ_REF;
LookupInTable(state, &DFHACK_TYPETABLE_TOKEN);
}
else
return Lua::OBJ_INVALID;
bool ok = !lua_isnil(state, -1);
lua_pop(state, 1);
return ok ? cls : Lua::OBJ_INVALID;
}
static const char *const primitive_types[] = {
"string",
"ptr-string",
"char",
"int8_t", "uint8_t", "int16_t", "uint16_t",
"int32_t", "uint32_t", "int64_t", "uint64_t",
"intptr_t", "uintptr_t", "long", "unsigned long",
"bool",
"float", "double",
"pointer",
"ptr-vector",
"bit-vector",
"bit-array",
NULL
};
static const type_identity *const primitive_identities[] = {
df::identity_traits<std::string>::get(),
df::identity_traits<const char*>::get(),
df::identity_traits<char>::get(),
df::identity_traits<int8_t>::get(), df::identity_traits<uint8_t>::get(),
df::identity_traits<int16_t>::get(), df::identity_traits<uint16_t>::get(),
df::identity_traits<int32_t>::get(), df::identity_traits<uint32_t>::get(),
df::identity_traits<int64_t>::get(), df::identity_traits<uint64_t>::get(),
df::identity_traits<intptr_t>::get(), df::identity_traits<uintptr_t>::get(),
df::identity_traits<long>::get(), df::identity_traits<unsigned long>::get(),
df::identity_traits<bool>::get(),
df::identity_traits<float>::get(), df::identity_traits<double>::get(),
df::identity_traits<void*>::get(),
df::identity_traits<std::vector<void*> >::get(),
df::identity_traits<std::vector<bool> >::get(),
df::identity_traits<BitArray<int> >::get(),
NULL
};
/**
* Given a DF object reference or type, safely retrieve its identity pointer.
*/
const type_identity *LuaWrapper::get_object_identity(lua_State *state, int objidx,
const char *ctx, bool allow_type,
bool keep_metatable)
{
if (allow_type && !keep_metatable && lua_isstring(state, objidx))
{
int idx = luaL_checkoption(state, objidx, NULL, primitive_types);
return primitive_identities[idx];
}
if (!lua_getmetatable(state, objidx))
luaL_error(state, "Invalid object in %s", ctx);
if (!allow_type && !lua_isuserdata(state, objidx))
luaL_error(state, "Object expected in %s", ctx);
if (!is_valid_metatable(state, objidx, -1))
luaL_error(state, "Invalid object metatable in %s", ctx);
// Extract identity from metatable
lua_rawgetp(state, -1, &DFHACK_IDENTITY_FIELD_TOKEN);
type_identity *id = (type_identity*)lua_touserdata(state, -1);
if (!id)
luaL_error(state, "Invalid object identity in %s", ctx);
lua_pop(state, keep_metatable ? 1 : 2);
return id;
}
static bool check_type_compatible(lua_State *state, int obj1, int obj2,
const type_identity **type1, const type_identity **type2,
const char *ctx, bool allow_type, bool exact, bool error = true)
{
int base = lua_gettop(state);
*type1 = get_object_identity(state, obj1, ctx, allow_type, true);
*type2 = get_object_identity(state, obj2, ctx, allow_type, true);
if (!is_type_compatible(state, *type1, base+1, *type2, base+2, exact))
{
if (!error)
{
lua_pop(state, 2);
return false;
}
lua_getfield(state, base+1, "__metatable");
const char *cname1 = lua_tostring(state, -1);
lua_getfield(state, base+2, "__metatable");
const char *cname2 = lua_tostring(state, -1);
luaL_error(state, "Types %s and %s incompatible in %s", cname1, cname2, ctx);
}
lua_pop(state, 2);
return true;
}
/**
* Metamethod: compare two DF object references.
*
* Equal if same pointer and same metatable.
*/
static int meta_ptr_compare(lua_State *state)
{
if (!lua_isuserdata(state, 1) || !lua_isuserdata(state, 2) ||
!lua_getmetatable(state, 1) || !lua_getmetatable(state, 2) ||
get_object_ref(state, 1) != get_object_ref(state, 2) ||
!is_type_compatible(state, 3, 4, true))
{
lua_pushboolean(state, false);
return 1;
}
lua_pushboolean(state, true);
return 1;
}
/**
* Method: sizeof for DF object references.
*
* Returns: size[, address]
*/
static int meta_sizeof(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 1)
luaL_error(state, "Usage: object:sizeof() or df.sizeof(object)");
// Two special cases: nil and lightuserdata for NULL and void*
if (lua_isnil(state, 1) || lua_islightuserdata(state, 1))
{
lua_pushnil(state);
lua_pushinteger(state, (size_t)lua_touserdata(state, 1));
return 2;
}
const type_identity *id = get_object_identity(state, 1, "df.sizeof()", true, true);
// Static arrays need special handling
if (id->type() == IDTYPE_BUFFER)
{
auto buf = (const df::buffer_container_identity*)id;
const type_identity *item = buf->getItemType();
int count = buf->getSize();
fetch_container_details(state, lua_gettop(state), &item, &count);
lua_pushinteger(state, item->byte_size() * count);
}
else
lua_pushinteger(state, id->byte_size());
// Add the address
if (lua_isuserdata(state, 1))
{
lua_pushinteger(state, (size_t)get_object_ref(state, 1));
return 2;
}
else
return 1;
}
/**
* Method: displace for DF object references.
*
* Returns: a reference with the same type, but modified address
*/
static int meta_displace(lua_State *state)
{
int argc = lua_gettop(state);
bool has_step = (argc >= 3);
if ((argc < 2 || argc > 3) ||
!lua_isnumber(state, 2) ||
(has_step && !lua_isnumber(state, 3)))
{
luaL_error(state, "Usage: object:_displace(index[,step]) or df._displace(object,...)");
}
int index = lua_tointeger(state, 2);
int step = has_step ? lua_tointeger(state, 3) : 1;
// Two special cases: nil and lightuserdata for NULL and void*
if (lua_isnil(state, 1))
{
lua_pushnil(state);
return 1;
}
if (lua_islightuserdata(state, 1))
{
if (!has_step)
luaL_error(state, "Step is mandatory in _displace of void*");
auto ptr = (uint8_t*)lua_touserdata(state, 1);
lua_pushlightuserdata(state, ptr + index*step);
return 1;
}
const type_identity *id = get_object_identity(state, 1, "df._displace()");
if (!has_step)
step = id->byte_size();
if (index == 0 || step == 0)
{
lua_pushvalue(state, 1);
}
else
{
auto ptr = (uint8_t*)get_object_ref(state, 1);
lua_getmetatable(state, 1);
push_object_ref(state, ptr + index*step);
}
return 1;
}
/**
* Method: allocation for DF object references.
*/
static int meta_new(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 1 && argc != 2)
luaL_error(state, "Usage: object:new() or df.new(object) or df.new(ptype,count)");
const type_identity *id = get_object_identity(state, 1, "df.new()", true);
void *ptr = nullptr;
std::string err_context;
// Support arrays of primitive types
if (argc == 2)
{
int cnt = luaL_checkint(state, 2);
if (cnt <= 0)
luaL_error(state, "Invalid array size in df.new()");
if (id->type() != IDTYPE_PRIMITIVE)
luaL_error(state, "Cannot allocate arrays of non-primitive types.");
size_t sz = id->byte_size() * cnt;
ptr = malloc(sz);
if (ptr)
memset(ptr, 0, sz);
}
else
{
try {
ptr = id->allocate();
}
catch (std::exception &e) {
if (e.what()) {
err_context = e.what();
}
}
}
if (!ptr)
luaL_error(state, "Cannot allocate %s%s%s",
id->getFullName().c_str(),
err_context.empty() ? "" : ": ",
err_context.c_str()
);
if (lua_isuserdata(state, 1))
{
lua_getmetatable(state, 1);
push_object_ref(state, ptr);
id->copy(ptr, get_object_ref(state, 1));
}
else
push_object_internal(state, id, ptr);
return 1;
}
/**
* Method: type casting of pointers.
*/
static int meta_reinterpret_cast(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 2)
luaL_error(state, "Usage: df.reinterpret_cast(type,ptr)");
const type_identity *id = get_object_identity(state, 1, "df.reinterpret_cast()", true);
// Find the raw pointer value
void *ptr;
if (lua_isnil(state, 2))
ptr = NULL;
else if (lua_isnumber(state, 2))
ptr = (void*)lua_tounsigned(state, 2);
else
{
ptr = get_object_internal(state, NULL, 2, false, true);
if (!ptr)
luaL_error(state, "Invalid pointer argument in df.reinterpret_cast.\n");
}
// Convert it to the appropriate representation
if (ptr == NULL)
{
lua_pushnil(state);
}
else if (lua_isuserdata(state, 1))
{
lua_getmetatable(state, 1);
push_object_ref(state, ptr);
}
else
push_object_internal(state, id, ptr);
return 1;
}
static void invoke_resize(lua_State *state, int table, lua_Integer size)
{
lua_getfield(state, table, "resize");
lua_pushvalue(state, table);
lua_pushinteger(state, size);
lua_call(state, 2, 0);
}
static void copy_table(lua_State *state, int dest, int src, int skipbase)
{
// stack: (skipbase) skipkey skipkey |
int top = lua_gettop(state);
lua_pushnil(state);
while (lua_next(state, src))
{
for (int i = skipbase+1; i <= top; i++)
{
if (lua_rawequal(state, -2, i))
{
lua_pop(state, 1);
goto next_outer;
}
}
{
lua_pushvalue(state, -2);
lua_swap(state);
lua_settable(state, dest);
}
next_outer:;
}
}
/**
* Method: assign data between objects.
*/
static int meta_assign(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 2)
luaL_error(state, "Usage: target:assign(src) or df.assign(target,src)");
if (!lua_istable(state, 2))
{
const type_identity *id1, *id2;
check_type_compatible(state, 1, 2, &id1, &id2, "df.assign()", false, false);
if (!id1->copy(get_object_ref(state, 1), get_object_ref(state, 2)))
luaL_error(state, "No copy support for %s", id1->getFullName().c_str());
}
else
{
const type_identity *id = get_object_identity(state, 1, "df.assign()", false);
if (lua_getmetatable(state, 2))
luaL_error(state, "cannot use lua tables with metatable in df.assign()");
int base = lua_gettop(state);
// x:assign{ assign = foo } => x:assign(foo)
bool has_assign = false;
lua_pushstring(state, "assign");
lua_dup(state);
lua_rawget(state, 2);
if (!lua_isnil(state,-1))
{
has_assign = true;
lua_getfield(state, LUA_REGISTRYINDEX, DFHACK_ASSIGN_NAME);
lua_pushvalue(state, 1);
lua_pushvalue(state, base+2);
lua_call(state, 2, 0);
}
lua_pop(state, 1);
// new is used by autovivification and should be skipped
lua_pushstring(state, "new");
if (id->isContainer())
{
// check resize field
lua_pushstring(state, "resize");
lua_dup(state);
lua_rawget(state, 2);
if (lua_isnil(state,-1) && !has_assign)
{
/*
* no assign && nil or missing resize field => 1-based lua array
*/
int size = lua_rawlen(state, 2);
lua_pop(state, 1);
invoke_resize(state, 1, size);
for (int i = 1; i <= size; i++)
{
lua_pushinteger(state, i-1);
lua_rawgeti(state, 2, i);
lua_settable(state, 1);
}
}
else
{
if (lua_isboolean(state, -1) || lua_isnil(state, -1))
{
// resize=false => just assign
// resize=true => find the largest index
if (lua_toboolean(state, -1))
{
lua_Integer size = 0;
lua_pushnil(state);
while (lua_next(state, 2))
{
lua_pop(state, 1);
if (lua_isnumber(state,-1))
size = std::max(size, lua_tointeger(state,-1)+1);
}
invoke_resize(state, 1, size);
}
}
else
{
// otherwise, must be an explicit number
if (!lua_isnumber(state,-1))
luaL_error(state, "Invalid container.resize value in df.assign()");
invoke_resize(state, 1, lua_tointeger(state, -1));
}
lua_pop(state, 1);
copy_table(state, 1, 2, base);
}
}
else
{
copy_table(state, 1, 2, base);
}
}
return 0;
}
/**
* Method: check if the two objects are assignment-compatible.
*/
static int meta_is_instance(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 2)
luaL_error(state, "Usage: type:is_instance(obj) or df.is_instance(type,obj)");
// If garbage as second argument, return nil
if (!lua_istable(state, 2) && (!lua_isuserdata(state,2) || lua_islightuserdata(state, 2)))
{
lua_pushnil(state);
return 1;
}
const type_identity *id1, *id2;
bool ok = check_type_compatible(state, 1, 2, &id1, &id2, "df.is_instance()", true, false, false);
lua_pushboolean(state, ok);
return 1;
}
/**
* Method: deallocation for DF object references.
*/
static int meta_delete(lua_State *state)
{
int argc = lua_gettop(state);
if (argc != 1)
luaL_error(state, "Usage: object:delete() or df.delete(object)");
if (lua_isnil(state, 1))
{
lua_pushboolean(state, true);
return 1;
}
const type_identity *id = get_object_identity(state, 1, "df.delete()", false);
bool ok = id->destroy(get_object_ref(state, 1));
lua_pushboolean(state, ok);
return 1;
}
/**
* Verify that the object is a DF ref with UPVAL_METATABLE.
* If everything ok, extract the address.
*/
uint8_t *LuaWrapper::get_object_addr(lua_State *state, int obj, int field, const char *mode)
{
if (!lua_isuserdata(state, obj) ||
!lua_getmetatable(state, obj))
field_error(state, field, "invalid object", mode);
if (!lua_rawequal(state, -1, UPVAL_METATABLE))
field_error(state, field, "invalid object metatable", mode);
lua_pop(state, 1);
return (uint8_t*)get_object_ref(state, obj);
}
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