diff options
| -rw-r--r-- | src/lstring.js | 3 | ||||
| -rw-r--r-- | src/ltable.js | 42 |
2 files changed, 43 insertions, 2 deletions
diff --git a/src/lstring.js b/src/lstring.js index 1887e85..a5ee669 100644 --- a/src/lstring.js +++ b/src/lstring.js @@ -27,7 +27,8 @@ const luaS_eqlngstr = function(a, b) { return a == b || (a.realstring.length == b.realstring.length && a.realstring.join() == b.realstring.join()); }; -/* converts strings (arrays) to a consistent map key */ +/* converts strings (arrays) to a consistent map key + make sure this doesn't conflict with any of the anti-collision strategies in ltable */ const luaS_hash = function(str) { assert(Array.isArray(str)); return str.map(e => `${e}|`).join(''); diff --git a/src/ltable.js b/src/ltable.js index c8bf7a2..88b09e3 100644 --- a/src/ltable.js +++ b/src/ltable.js @@ -7,8 +7,20 @@ const defs = require('./defs.js'); const ldebug = require('./ldebug.js'); const lobject = require('./lobject.js'); const lstring = require('./lstring.js'); +const lstate = require('./lstate.js'); const CT = defs.constant_types; +/* used to prevent conflicts with lightuserdata keys */ +let lightuserdata_hashes = new WeakMap(); +const get_lightuserdata_hash = function(v) { + let hash = lightuserdata_hashes.get(v); + if (!hash) { + hash = Symbol("lightuserdata"); + lightuserdata_hashes.set(v, hash); + } + return hash; +}; + const table_hash = function(L, key) { switch(key.type) { case CT.LUA_TNIL: @@ -18,7 +30,6 @@ const table_hash = function(L, key) { return ldebug.luaG_runerror(L, defs.to_luastring("table index is NaN", true)); /* fall through */ case CT.LUA_TBOOLEAN: - case CT.LUA_TLIGHTUSERDATA: /* XXX: if user pushes conflicting lightuserdata then the table will do odd things */ case CT.LUA_TNUMINT: case CT.LUA_TTABLE: case CT.LUA_TLCL: @@ -30,6 +41,35 @@ const table_hash = function(L, key) { case CT.LUA_TSHRSTR: case CT.LUA_TLNGSTR: return lstring.luaS_hashlongstr(key.tsvalue()); + case CT.LUA_TLIGHTUSERDATA: + let v = key.value; + switch(typeof v) { + case "string": + /* possible conflict with LUA_TSTRING. + prefix this string with "*" so they don't clash */ + return "*" + v; + case "number": + /* possible conflict with LUA_TNUMBER. + turn into string and prefix with "#" to avoid clash with other strings */ + return "#" + v; + case "boolean": + /* possible conflict with LUA_TBOOLEAN. use strings ?true and ?false instead */ + return v?"?true":"?false"; + case "function": + /* possible conflict with LUA_TLCF. + indirect via a weakmap */ + return get_lightuserdata_hash(v); + case "object": + /* v shouldn't be a CClosure, LClosure, Table or Userdata from this state as they're never exposed + the only exposed internal type is a lua_State */ + if (v instanceof lstate.lua_State && v.l_G === L.l_G) { + /* indirect via a weakmap */ + return get_lightuserdata_hash(v); + } + /* fall through */ + default: + return v; + } default: throw new Error("unknown key type: " + key.type); } |