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Copy pathrefvalue.cpp
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333 lines (306 loc) · 9.15 KB
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#include "util/refvalue.h"
#include <bee/nonstd/unreachable.h>
#include <cassert>
#include <cstring>
#include "compat/table.h"
#include "rdebug_lua.h"
namespace luadebug::refvalue {
template <typename T>
int eval(T&, lua_State*, value*);
template <>
int eval<FRAME_LOCAL>(FRAME_LOCAL& v, lua_State* hL, value*) {
lua_Debug ar;
if (lua_getstack(hL, v.frame, &ar) == 0)
return LUA_TNONE;
const char* name = lua_getlocal(hL, &ar, v.n);
if (name) {
return lua_type(hL, -1);
}
return LUA_TNONE;
}
template <>
int eval<FRAME_FUNC>(FRAME_FUNC& v, lua_State* hL, value*) {
lua_Debug ar;
if (lua_getstack(hL, v.frame, &ar) == 0)
return LUA_TNONE;
if (lua_getinfo(hL, "f", &ar) == 0)
return LUA_TNONE;
return LUA_TFUNCTION;
}
template <>
int eval<GLOBAL>(GLOBAL& v, lua_State* hL, value*) {
#if LUA_VERSION_NUM == 501
lua_pushvalue(hL, LUA_GLOBALSINDEX);
return LUA_TTABLE;
#else
return lua::rawgeti(hL, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
#endif
}
template <>
int eval<REGISTRY>(REGISTRY& v, lua_State* hL, value*) {
switch (v.type) {
case REGISTRY_TYPE::REGISTRY:
lua_pushvalue(hL, LUA_REGISTRYINDEX);
return LUA_TTABLE;
case REGISTRY_TYPE::DEBUG_REF:
return lua::getfield(hL, LUA_REGISTRYINDEX, "__debugger_ref");
case REGISTRY_TYPE::DEBUG_WATCH:
return lua::getfield(hL, LUA_REGISTRYINDEX, "__debugger_watch");
default:
std::unreachable();
}
}
template <>
int eval<STACK>(STACK& v, lua_State* hL, value*) {
lua_pushvalue(hL, v.index);
return lua_type(hL, -1);
}
template <>
int eval<UPVALUE>(UPVALUE& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TFUNCTION) {
lua_pop(hL, 1);
return LUA_TNONE;
}
if (lua_getupvalue(hL, -1, v.n)) {
lua_replace(hL, -2);
return lua_type(hL, -1);
}
else {
lua_pop(hL, 1);
return LUA_TNONE;
}
}
template <>
int eval<METATABLE>(METATABLE& v, lua_State* hL, value* parent) {
switch (v.type) {
case LUA_TNIL:
lua_pushnil(hL);
break;
case LUA_TBOOLEAN:
lua_pushboolean(hL, 0);
break;
case LUA_TNUMBER:
lua_pushinteger(hL, 0);
break;
case LUA_TSTRING:
lua_pushstring(hL, "");
break;
case LUA_TLIGHTUSERDATA:
lua_pushlightuserdata(hL, NULL);
break;
case LUA_TTABLE:
case LUA_TUSERDATA: {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TTABLE && t != LUA_TUSERDATA) {
lua_pop(hL, 1);
return LUA_TNONE;
}
break;
}
default:
return LUA_TNONE;
}
if (lua_getmetatable(hL, -1)) {
lua_replace(hL, -2);
return lua_type(hL, -1);
}
else {
lua_pop(hL, 1);
return LUA_TNONE;
}
}
template <>
int eval<USERVALUE>(USERVALUE& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TUSERDATA) {
lua_pop(hL, 1);
return LUA_TNONE;
}
t = lua_getiuservalue(hL, -1, v.n);
lua_replace(hL, -2);
return t;
}
template <>
int eval<TABLE_ARRAY>(TABLE_ARRAY& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TTABLE) {
lua_pop(hL, 1);
return LUA_TNONE;
}
const void* tv = lua_topointer(hL, -1);
if (!tv) {
lua_pop(hL, 1);
return LUA_TNONE;
}
if (!luadebug::table::get_array(hL, tv, v.index)) {
lua_pop(hL, 1);
return LUA_TNONE;
}
lua_replace(hL, -2);
return lua_type(hL, -1);
}
template <>
int eval<TABLE_HASH_KEY>(TABLE_HASH_KEY& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TTABLE) {
lua_pop(hL, 1);
return LUA_TNONE;
}
const void* tv = lua_topointer(hL, -1);
if (!tv) {
lua_pop(hL, 1);
return LUA_TNONE;
}
if (!luadebug::table::get_hash_k(hL, tv, v.index)) {
lua_pop(hL, 1);
return LUA_TNONE;
}
lua_replace(hL, -2);
return lua_type(hL, -1);
}
template <>
int eval<TABLE_HASH_VAL>(TABLE_HASH_VAL& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return LUA_TNONE;
if (t != LUA_TTABLE) {
lua_pop(hL, 1);
return LUA_TNONE;
}
const void* tv = lua_topointer(hL, -1);
if (!tv) {
lua_pop(hL, 1);
return LUA_TNONE;
}
if (!luadebug::table::get_hash_v(hL, tv, v.index)) {
lua_pop(hL, 1);
return LUA_TNONE;
}
lua_replace(hL, -2);
return lua_type(hL, -1);
}
int eval(value* v, lua_State* hL) {
return visit([hL, v](auto&& arg) { return eval(arg, hL, v + 1); }, *v);
}
template <typename T>
bool assign(T&, lua_State*, value*) {
return false;
}
template <>
bool assign<FRAME_LOCAL>(FRAME_LOCAL& v, lua_State* hL, value*) {
lua_Debug ar;
if (lua_getstack(hL, v.frame, &ar) == 0) {
return false;
}
if (lua_setlocal(hL, &ar, v.n) != NULL) {
return true;
}
return false;
}
template <>
bool assign<UPVALUE>(UPVALUE& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t != LUA_TFUNCTION)
return false;
lua_insert(hL, -2);
return lua_setupvalue(hL, -2, v.n) != NULL;
}
template <>
bool assign<METATABLE>(METATABLE& v, lua_State* hL, value* parent) {
switch (v.type) {
case LUA_TNIL:
lua_pushnil(hL);
break;
case LUA_TBOOLEAN:
lua_pushboolean(hL, 0);
break;
case LUA_TNUMBER:
lua_pushinteger(hL, 0);
break;
case LUA_TSTRING:
lua_pushstring(hL, "");
break;
case LUA_TLIGHTUSERDATA:
lua_pushlightuserdata(hL, NULL);
break;
case LUA_TTABLE:
case LUA_TUSERDATA: {
int t = eval(parent, hL);
if (t != LUA_TTABLE && t != LUA_TUSERDATA) {
return false;
}
break;
}
default:
return false;
}
lua_insert(hL, -2);
int metattype = lua_type(hL, -1);
if (metattype != LUA_TNIL && metattype != LUA_TTABLE) {
return false;
}
lua_setmetatable(hL, -2);
return true;
}
template <>
bool assign<USERVALUE>(USERVALUE& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t != LUA_TUSERDATA)
return false;
lua_insert(hL, -2);
lua_setiuservalue(hL, -2, v.n);
return true;
}
template <>
bool assign<TABLE_ARRAY>(TABLE_ARRAY& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t != LUA_TTABLE)
return false;
lua_insert(hL, -2);
const void* tv = lua_topointer(hL, -2);
if (!tv)
return false;
return luadebug::table::set_array(hL, tv, v.index);
}
template <>
bool assign<TABLE_HASH_VAL>(TABLE_HASH_VAL& v, lua_State* hL, value* parent) {
int t = eval(parent, hL);
if (t == LUA_TNONE)
return false;
if (t != LUA_TTABLE)
return false;
lua_insert(hL, -2);
const void* tv = lua_topointer(hL, -2);
if (!tv)
return false;
return luadebug::table::set_hash_v(hL, tv, v.index);
}
bool assign(value* v, lua_State* hL) {
int top = lua_gettop(hL);
bool ok = visit([hL, v](auto&& arg) { return assign(arg, hL, v + 1); }, *v);
lua_settop(hL, top - 1);
return ok;
}
value* create_userdata(luadbg_State* L, int n) {
return (value*)luadbg_newuserdatauv(L, n * sizeof(value), 0);
}
value* create_userdata(luadbg_State* L, int n, int parent) {
assert(luadbg_type(L, parent) == LUADBG_TUSERDATA);
void* parent_data = luadbg_touserdata(L, parent);
size_t parent_size = static_cast<size_t>(luadbg_rawlen(L, parent));
void* v = luadbg_newuserdatauv(L, n * sizeof(value) + parent_size, 0);
memcpy((std::byte*)v + n * sizeof(value), parent_data, parent_size);
return (value*)v;
}
}