516 lines
15 KiB
JavaScript
516 lines
15 KiB
JavaScript
"use strict";
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const {
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LUA_MASKCALL,
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LUA_MASKCOUNT,
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LUA_MASKLINE,
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LUA_MASKRET,
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LUA_REGISTRYINDEX,
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LUA_TFUNCTION,
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LUA_TNIL,
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LUA_TTABLE,
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LUA_TUSERDATA,
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lua_Debug,
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lua_call,
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lua_checkstack,
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lua_gethook,
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lua_gethookcount,
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lua_gethookmask,
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lua_getinfo,
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lua_getlocal,
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lua_getmetatable,
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lua_getstack,
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lua_getupvalue,
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lua_getuservalue,
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lua_insert,
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lua_iscfunction,
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lua_isfunction,
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lua_isnoneornil,
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lua_isthread,
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lua_newtable,
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lua_pcall,
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lua_pop,
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lua_pushboolean,
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lua_pushfstring,
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lua_pushinteger,
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lua_pushlightuserdata,
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lua_pushliteral,
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lua_pushnil,
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lua_pushstring,
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lua_pushvalue,
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lua_rawgetp,
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lua_rawsetp,
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lua_rotate,
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lua_setfield,
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lua_sethook,
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lua_setlocal,
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lua_setmetatable,
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lua_settop,
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lua_setupvalue,
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lua_setuservalue,
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lua_tojsstring,
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lua_toproxy,
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lua_tostring,
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lua_tothread,
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lua_touserdata,
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lua_type,
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lua_upvalueid,
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lua_upvaluejoin,
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lua_xmove
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} = require('./lua.js');
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const {
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luaL_argcheck,
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luaL_argerror,
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luaL_checkany,
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luaL_checkinteger,
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luaL_checkstring,
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luaL_checktype,
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luaL_error,
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luaL_loadbuffer,
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luaL_newlib,
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luaL_optinteger,
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luaL_optstring,
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luaL_traceback,
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lua_writestringerror
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} = require('./lauxlib.js');
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const lualib = require('./lualib.js');
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const {
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luastring_indexOf,
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to_luastring
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} = require("./fengaricore.js");
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/*
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** If L1 != L, L1 can be in any state, and therefore there are no
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** guarantees about its stack space; any push in L1 must be
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** checked.
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*/
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const checkstack = function(L, L1, n) {
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if (L !== L1 && !lua_checkstack(L1, n))
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luaL_error(L, to_luastring("stack overflow", true));
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};
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const db_getregistry = function(L) {
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lua_pushvalue(L, LUA_REGISTRYINDEX);
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return 1;
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};
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const db_getmetatable = function(L) {
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luaL_checkany(L, 1);
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if (!lua_getmetatable(L, 1)) {
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lua_pushnil(L); /* no metatable */
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}
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return 1;
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};
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const db_setmetatable = function(L) {
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const t = lua_type(L, 2);
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luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table expected");
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lua_settop(L, 2);
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lua_setmetatable(L, 1);
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return 1; /* return 1st argument */
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};
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const db_getuservalue = function(L) {
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if (lua_type(L, 1) !== LUA_TUSERDATA)
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lua_pushnil(L);
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else
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lua_getuservalue(L, 1);
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return 1;
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};
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const db_setuservalue = function(L) {
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luaL_checktype(L, 1, LUA_TUSERDATA);
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luaL_checkany(L, 2);
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lua_settop(L, 2);
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lua_setuservalue(L, 1);
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return 1;
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};
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/*
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** Auxiliary function used by several library functions: check for
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** an optional thread as function's first argument and set 'arg' with
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** 1 if this argument is present (so that functions can skip it to
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** access their other arguments)
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*/
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const getthread = function(L) {
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if (lua_isthread(L, 1)) {
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return {
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arg: 1,
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thread: lua_tothread(L, 1)
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};
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} else {
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return {
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arg: 0,
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thread: L
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}; /* function will operate over current thread */
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}
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};
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/*
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** Variations of 'lua_settable', used by 'db_getinfo' to put results
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** from 'lua_getinfo' into result table. Key is always a string;
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** value can be a string, an int, or a boolean.
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*/
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const settabss = function(L, k, v) {
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lua_pushstring(L, v);
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lua_setfield(L, -2, k);
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};
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const settabsi = function(L, k, v) {
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lua_pushinteger(L, v);
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lua_setfield(L, -2, k);
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};
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const settabsb = function(L, k, v) {
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lua_pushboolean(L, v);
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lua_setfield(L, -2, k);
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};
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/*
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** In function 'db_getinfo', the call to 'lua_getinfo' may push
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** results on the stack; later it creates the result table to put
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** these objects. Function 'treatstackoption' puts the result from
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** 'lua_getinfo' on top of the result table so that it can call
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** 'lua_setfield'.
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*/
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const treatstackoption = function(L, L1, fname) {
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if (L == L1)
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lua_rotate(L, -2, 1); /* exchange object and table */
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else
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lua_xmove(L1, L, 1); /* move object to the "main" stack */
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lua_setfield(L, -2, fname); /* put object into table */
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};
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/*
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** Calls 'lua_getinfo' and collects all results in a new table.
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** L1 needs stack space for an optional input (function) plus
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** two optional outputs (function and line table) from function
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** 'lua_getinfo'.
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*/
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const db_getinfo = function(L) {
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let ar = new lua_Debug();
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let thread = getthread(L);
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let arg = thread.arg;
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let L1 = thread.thread;
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let options = luaL_optstring(L, arg + 2, "flnStu");
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checkstack(L, L1, 3);
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if (lua_isfunction(L, arg + 1)) { /* info about a function? */
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options = lua_pushfstring(L, to_luastring(">%s"), options); /* add '>' to 'options' */
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lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */
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lua_xmove(L, L1, 1);
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} else { /* stack level */
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if (!lua_getstack(L1, luaL_checkinteger(L, arg + 1), ar)) {
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lua_pushnil(L); /* level out of range */
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return 1;
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}
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}
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if (!lua_getinfo(L1, options, ar))
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luaL_argerror(L, arg + 2, "invalid option");
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lua_newtable(L); /* table to collect results */
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if (luastring_indexOf(options, 83 /* 'S'.charCodeAt(0) */) > -1) {
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settabss(L, to_luastring("source", true), ar.source);
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settabss(L, to_luastring("short_src", true), ar.short_src);
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settabsi(L, to_luastring("linedefined", true), ar.linedefined);
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settabsi(L, to_luastring("lastlinedefined", true), ar.lastlinedefined);
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settabss(L, to_luastring("what", true), ar.what);
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}
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if (luastring_indexOf(options, 108 /* 'l'.charCodeAt(0) */) > -1)
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settabsi(L, to_luastring("currentline", true), ar.currentline);
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if (luastring_indexOf(options, 117 /* 'u'.charCodeAt(0) */) > -1) {
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settabsi(L, to_luastring("nups", true), ar.nups);
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settabsi(L, to_luastring("nparams", true), ar.nparams);
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settabsb(L, to_luastring("isvararg", true), ar.isvararg);
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}
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if (luastring_indexOf(options, 110 /* 'n'.charCodeAt(0) */) > -1) {
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settabss(L, to_luastring("name", true), ar.name);
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settabss(L, to_luastring("namewhat", true), ar.namewhat);
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}
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if (luastring_indexOf(options, 116 /* 't'.charCodeAt(0) */) > -1)
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settabsb(L, to_luastring("istailcall", true), ar.istailcall);
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if (luastring_indexOf(options, 76 /* 'L'.charCodeAt(0) */) > -1)
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treatstackoption(L, L1, to_luastring("activelines", true));
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if (luastring_indexOf(options, 102 /* 'f'.charCodeAt(0) */) > -1)
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treatstackoption(L, L1, to_luastring("func", true));
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return 1; /* return table */
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};
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const db_getlocal = function(L) {
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let thread = getthread(L);
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let L1 = thread.thread;
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let arg = thread.arg;
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let ar = new lua_Debug();
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let nvar = luaL_checkinteger(L, arg + 2); /* local-variable index */
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if (lua_isfunction(L, arg + 1)) {
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lua_pushvalue(L, arg + 1); /* push function */
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lua_pushstring(L, lua_getlocal(L, null, nvar)); /* push local name */
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return 1; /* return only name (there is no value) */
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} else { /* stack-level argument */
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let level = luaL_checkinteger(L, arg + 1);
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if (!lua_getstack(L1, level, ar)) /* out of range? */
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return luaL_argerror(L, arg+1, "level out of range");
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checkstack(L, L1, 1);
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let name = lua_getlocal(L1, ar, nvar);
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if (name) {
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lua_xmove(L1, L, 1); /* move local value */
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lua_pushstring(L, name); /* push name */
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lua_rotate(L, -2, 1); /* re-order */
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return 2;
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}
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else {
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lua_pushnil(L); /* no name (nor value) */
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return 1;
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}
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}
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};
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const db_setlocal = function(L) {
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let thread = getthread(L);
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let L1 = thread.thread;
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let arg = thread.arg;
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let ar = new lua_Debug();
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let level = luaL_checkinteger(L, arg + 1);
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let nvar = luaL_checkinteger(L, arg + 2);
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if (!lua_getstack(L1, level, ar)) /* out of range? */
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return luaL_argerror(L, arg + 1, "level out of range");
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luaL_checkany(L, arg + 3);
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lua_settop(L, arg + 3);
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checkstack(L, L1, 1);
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lua_xmove(L, L1, 1);
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let name = lua_setlocal(L1, ar, nvar);
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if (name === null)
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lua_pop(L1, 1); /* pop value (if not popped by 'lua_setlocal') */
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lua_pushstring(L, name);
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return 1;
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};
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/*
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** get (if 'get' is true) or set an upvalue from a closure
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*/
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const auxupvalue = function(L, get) {
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let n = luaL_checkinteger(L, 2); /* upvalue index */
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luaL_checktype(L, 1, LUA_TFUNCTION); /* closure */
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let name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
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if (name === null) return 0;
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lua_pushstring(L, name);
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lua_insert(L, -(get+1)); /* no-op if get is false */
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return get + 1;
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};
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const db_getupvalue = function(L) {
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return auxupvalue(L, 1);
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};
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const db_setupvalue = function(L) {
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luaL_checkany(L, 3);
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return auxupvalue(L, 0);
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};
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/*
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** Check whether a given upvalue from a given closure exists and
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** returns its index
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*/
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const checkupval = function(L, argf, argnup) {
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let nup = luaL_checkinteger(L, argnup); /* upvalue index */
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luaL_checktype(L, argf, LUA_TFUNCTION); /* closure */
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luaL_argcheck(L, (lua_getupvalue(L, argf, nup) !== null), argnup, "invalid upvalue index");
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return nup;
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};
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const db_upvalueid = function(L) {
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let n = checkupval(L, 1, 2);
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lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
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return 1;
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};
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const db_upvaluejoin = function(L) {
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let n1 = checkupval(L, 1, 2);
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let n2 = checkupval(L, 3, 4);
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luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
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luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
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lua_upvaluejoin(L, 1, n1, 3, n2);
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return 0;
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};
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/*
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** The hook table at registry[HOOKKEY] maps threads to their current
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** hook function. (We only need the unique address of 'HOOKKEY'.)
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*/
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const HOOKKEY = to_luastring("__hooks__", true);
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const hooknames = ["call", "return", "line", "count", "tail call"].map(e => to_luastring(e));
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/*
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** Call hook function registered at hook table for the current
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** thread (if there is one)
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*/
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const hookf = function(L, ar) {
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lua_rawgetp(L, LUA_REGISTRYINDEX, HOOKKEY);
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let hooktable = lua_touserdata(L, -1);
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let proxy = hooktable.get(L);
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if (proxy) { /* is there a hook function? */
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proxy(L);
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lua_pushstring(L, hooknames[ar.event]); /* push event name */
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if (ar.currentline >= 0)
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lua_pushinteger(L, ar.currentline); /* push current line */
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else lua_pushnil(L);
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lualib.lua_assert(lua_getinfo(L, to_luastring("lS"), ar));
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lua_call(L, 2, 0); /* call hook function */
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}
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};
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/*
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** Convert a string mask (for 'sethook') into a bit mask
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*/
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const makemask = function(smask, count) {
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let mask = 0;
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if (luastring_indexOf(smask, 99 /* 'c'.charCodeAt(0) */) > -1) mask |= LUA_MASKCALL;
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if (luastring_indexOf(smask, 114 /* 'r'.charCodeAt(0) */) > -1) mask |= LUA_MASKRET;
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if (luastring_indexOf(smask, 108 /* 'l'.charCodeAt(0) */) > -1) mask |= LUA_MASKLINE;
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if (count > 0) mask |= LUA_MASKCOUNT;
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return mask;
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};
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/*
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** Convert a bit mask (for 'gethook') into a string mask
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*/
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const unmakemask = function(mask, smask) {
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let i = 0;
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if (mask & LUA_MASKCALL) smask[i++] = 99 /* 'c'.charCodeAt(0) */;
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if (mask & LUA_MASKRET) smask[i++] = 114 /* 'r'.charCodeAt(0) */;
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if (mask & LUA_MASKLINE) smask[i++] = 108 /* 'l'.charCodeAt(0) */;
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return smask.subarray(0, i);
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};
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const db_sethook = function(L) {
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let mask, count, func;
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let thread = getthread(L);
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let L1 = thread.thread;
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let arg = thread.arg;
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if (lua_isnoneornil(L, arg+1)) { /* no hook? */
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lua_settop(L, arg+1);
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func = null; mask = 0; count = 0; /* turn off hooks */
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}
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else {
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const smask = luaL_checkstring(L, arg + 2);
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luaL_checktype(L, arg+1, LUA_TFUNCTION);
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count = luaL_optinteger(L, arg + 3, 0);
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func = hookf; mask = makemask(smask, count);
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}
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/* as weak tables are not supported; use a JS weak-map */
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let hooktable;
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if (lua_rawgetp(L, LUA_REGISTRYINDEX, HOOKKEY) === LUA_TNIL) {
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hooktable = new WeakMap();
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lua_pushlightuserdata(L, hooktable);
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lua_rawsetp(L, LUA_REGISTRYINDEX, HOOKKEY); /* set it in position */
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} else {
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hooktable = lua_touserdata(L, -1);
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}
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let proxy = lua_toproxy(L, arg + 1); /* value (hook function) */
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hooktable.set(L1, proxy);
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lua_sethook(L1, func, mask, count);
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return 0;
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};
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const db_gethook = function(L) {
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let thread = getthread(L);
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let L1 = thread.thread;
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let buff = new Uint8Array(5);
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let mask = lua_gethookmask(L1);
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let hook = lua_gethook(L1);
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if (hook === null) /* no hook? */
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lua_pushnil(L);
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else if (hook !== hookf) /* external hook? */
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lua_pushliteral(L, "external hook");
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else { /* hook table must exist */
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lua_rawgetp(L, LUA_REGISTRYINDEX, HOOKKEY);
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let hooktable = lua_touserdata(L, -1);
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let proxy = hooktable.get(L1);
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proxy(L);
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}
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lua_pushstring(L, unmakemask(mask, buff)); /* 2nd result = mask */
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lua_pushinteger(L, lua_gethookcount(L1)); /* 3rd result = count */
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return 3;
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};
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const db_traceback = function(L) {
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let thread = getthread(L);
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let L1 = thread.thread;
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let arg = thread.arg;
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let msg = lua_tostring(L, arg + 1);
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if (msg === null && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
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lua_pushvalue(L, arg + 1); /* return it untouched */
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else {
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let level = luaL_optinteger(L, arg + 2, L === L1 ? 1 : 0);
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luaL_traceback(L, L1, msg, level);
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}
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return 1;
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};
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const dblib = {
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"gethook": db_gethook,
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"getinfo": db_getinfo,
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"getlocal": db_getlocal,
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"getmetatable": db_getmetatable,
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"getregistry": db_getregistry,
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"getupvalue": db_getupvalue,
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"getuservalue": db_getuservalue,
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"sethook": db_sethook,
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"setlocal": db_setlocal,
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"setmetatable": db_setmetatable,
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"setupvalue": db_setupvalue,
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"setuservalue": db_setuservalue,
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"traceback": db_traceback,
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"upvalueid": db_upvalueid,
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"upvaluejoin": db_upvaluejoin
|
|
};
|
|
|
|
let getinput;
|
|
if (typeof process !== "undefined") { // Only with Node
|
|
const readlineSync = require('readline-sync');
|
|
readlineSync.setDefaultOptions({
|
|
prompt: 'lua_debug> '
|
|
});
|
|
getinput = function() {
|
|
return readlineSync.prompt();
|
|
};
|
|
} else if (typeof window !== "undefined") {
|
|
/* if in browser use window.prompt. Doesn't work from web workers.
|
|
See https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt
|
|
*/
|
|
getinput = function() {
|
|
let input = prompt("lua_debug>", "");
|
|
return (input !== null) ? input : "";
|
|
};
|
|
}
|
|
if (getinput) {
|
|
dblib.debug = function(L) {
|
|
for (;;) {
|
|
let input = getinput();
|
|
|
|
if (input === "cont")
|
|
return 0;
|
|
|
|
if (input.length === 0)
|
|
continue;
|
|
|
|
let buffer = to_luastring(input);
|
|
if (luaL_loadbuffer(L, buffer, buffer.length, to_luastring("=(debug command)", true))
|
|
|| lua_pcall(L, 0, 0, 0)) {
|
|
lua_writestringerror(lua_tojsstring(L, -1), "\n");
|
|
}
|
|
lua_settop(L, 0); /* remove eventual returns */
|
|
}
|
|
};
|
|
}
|
|
|
|
const luaopen_debug = function(L) {
|
|
luaL_newlib(L, dblib);
|
|
return 1;
|
|
};
|
|
|
|
module.exports.luaopen_debug = luaopen_debug;
|