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/*jshint esversion: 6 */
"use strict";
const test = require('tape');
const beautify = require('js-beautify').js_beautify;
const VM = require("../src/lvm.js");
const OC = require('../src/lopcodes.js');
const getState = require("./tests.js").getState;
test('__index, __newindex: with actual table', function (t) {
let luaCode = `
local t = {yo=1}
return t.yo, t.lo
`, L;
t.plan(3);
t.comment("Running following code: \n" + luaCode);
t.doesNotThrow(function () {
L = getState(luaCode);
VM.luaV_execute(L);
}, "Program executed without errors");
t.strictEqual(
L.stack[L.top - 1].value,
null,
"Program output is correct"
);
t.strictEqual(
L.stack[L.top - 2].value,
1,
"Program output is correct"
);
});
test('__index: with non table', function (t) {
let luaCode = `
local t = "a string"
return t.yo
`, L;
t.plan(2);
t.comment("Running following code: \n" + luaCode);
t.doesNotThrow(function () {
L = getState(luaCode);
}, "Bytecode parsed without errors");
t.throws(function () {
VM.luaV_execute(L);
}, "Program executed with expected error");
});
test('__newindex: with non table', function (t) {
let luaCode = `
local t = "a string"
t.yo = "hello"
`, L;
t.plan(2);
t.comment("Running following code: \n" + luaCode);
t.doesNotThrow(function () {
L = getState(luaCode);
}, "Bytecode parsed without errors");
t.throws(function () {
VM.luaV_execute(L);
}, "Program executed with expected error");
});
test('__index function in metatable', function (t) {
let luaCode = `
local mt = {
__index = function (table, key)
return "__index"
end
}
local t = {}
-- setmetatable(t, mt)
return t.yo
`, L;
t.plan(8);
t.comment("Running following code: \n" + luaCode);
t.doesNotThrow(function () {
L = getState(luaCode);
}, "Bytecode parsed without errors");
// main <hello.lua:0,0> (7 instructions at 0x7fe6b4403050)
// 0+ params, 3 slots, 1 upvalue, 2 locals, 2 constants, 1 function
// 1 [1] NEWTABLE 0 0 1
// 2 [4] CLOSURE 1 0 ; 0x7fe6b4403290
// 3 [4] SETTABLE 0 -1 1 ; "__index" -
// 4 [7] NEWTABLE 1 0 0
// 5 [9] GETTABLE 2 1 -2 ; "yo" <=== We stop here
// 6 [9] RETURN 2 2
// 7 [9] RETURN 0 1
//
// function <hello.lua:2,4> (3 instructions at 0x7fe6b4403290)
// 2 params, 3 slots, 0 upvalues, 2 locals, 1 constant, 0 functions
// 1 [3] LOADK 2 -1 ; "__index"
// 2 [3] RETURN 2 2
// 3 [4] RETURN 0 1
t.strictEqual(
OC.OpCodes[L.stack[0].p.code[4].opcode],
"OP_GETTABLE",
"Correct opcode marked as breakpoint"
);
t.comment("We set a breakpoint just before 'return t.yo'")
L.stack[0].p.code[4].breakpoint = true; // Stop just before 'return t.yo'
t.doesNotThrow(function () {
VM.luaV_execute(L);
}, "First part of the program executed without errors");
t.strictEqual(
OC.OpCodes[L.ci.u.l.savedpc[L.ci.pcOff - 1].opcode],
"OP_GETTABLE",
"Stopped at correct opcode"
);
t.comment("We unset the breakpoint and correct pcOff");
L.ci.pcOff--;
L.stack[0].p.code[4].breakpoint = false;
t.ok(
L.stack[2].ttistable() && !L.stack[2].value.hash.get("__index"),
"t is on stack at 2"
);
t.ok(
L.stack[1].ttistable() && L.stack[1].value.hash.get("__index"),
"mt is on stack at 1"
);
t.comment("We manually set t's metatable to mt");
L.stack[2].metatable = L.stack[1];
t.doesNotThrow(function () {
VM.luaV_execute(L);
}, "Second part of the program executed without errors");
t.strictEqual(
L.stack[L.top - 1].value,
"__index",
"Program output is correct"
);
});
|
