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debug #12

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22 changes: 22 additions & 0 deletions lualua.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ static const char lualua_host_refname[] =
"github.com/lua-wow-tools/lualua/host";
static const char lualua_sandbox_refname[] =
"github.com/lua-wow-tools/lualua/sandbox";
static const char lualua_debug_metatable[] = "lualua debug";
static const char lualua_state_metatable[] = "lualua state";
static const char lualua_gctoken_metatable[] = "lualua gctoken";

Expand Down Expand Up @@ -214,6 +215,20 @@ static int lualua_getmetatable(lua_State *L) {
return 1;
}

static int lualua_getstack(lua_State *L) {
lualua_State *S = lualua_checkstate(L, 1);
int level = luaL_checkint(L, 2);
lua_Debug *ar = lua_newuserdata(L, sizeof(lua_Debug));
if (lua_getstack(S->state, level, ar)) {
luaL_getmetatable(L, lualua_debug_metatable);
lua_setmetatable(L, -2);
} else {
lua_pop(L, 1);
lua_pushnil(L);
}
return 1;
}

static int lualua_gettable(lua_State *L) {
lualua_State *S = lualua_checkstate(L, 1);
int index = lualua_checkacceptableindex(L, 2, S);
Expand Down Expand Up @@ -754,6 +769,7 @@ static const struct luaL_Reg lualua_state_index[] = {
{"getfield", lualua_getfield},
{"getglobal", lualua_getglobal},
{"getmetatable", lualua_getmetatable},
{"getstack", lualua_getstack},
{"gettable", lualua_gettable},
{"gettop", lualua_gettop},
{"insert", lualua_insert},
Expand Down Expand Up @@ -867,6 +883,12 @@ int luaopen_lualua(lua_State *L) {
lua_settable(L, -3);
}
lua_pop(L, 1);
if (luaL_newmetatable(L, lualua_debug_metatable)) {
lua_pushstring(L, "__metatable");
lua_pushstring(L, lualua_debug_metatable);
lua_settable(L, -3);
}
lua_pop(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, lualua_host_refname);
if (lua_isnil(L, -1)) {
lua_newtable(L);
Expand Down
16 changes: 16 additions & 0 deletions spec/lualua_spec.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -400,6 +400,22 @@ describe('lualua', function()
end)
end)

describe('getstack', function()
it('is nil on bare state', function()
local s = lib.newstate()
local d = s:getstack(0)
assert.Nil(d)
end)
it('works inside a pushcfunction', function()
local s = lib.newstate()
s:pushcfunction(function(ss)
local d = ss:getstack(0)
assert.same('userdata', type(d))
end)
s:call(0, 0)
end)
end)

describe('gettable', function()
it('fails on empty stack', function()
local s = lib.newstate()
Expand Down