michael@0: function errorToString(e) {
michael@0:     try {} catch (e2) {}
michael@0: }
michael@0: Object.getOwnPropertyNames(this);
michael@0: if (false) {
michael@0:     for (let x of constructors)
michael@0:     print(x);
michael@0: }
michael@0: var tryRunning = tryRunningDirectly;
michael@0: function unlikelyToHang(code) {
michael@0:     var codeL = code.replace(/\s/g, " ");
michael@0:     return true && code.indexOf("infloop") == -1 && !(codeL.match(/const.*for/)) // can be an infinite loop: function() { const x = 1; for each(x in ({a1:1})) dumpln(3); }
michael@0:     && !(codeL.match(/for.*const/)) // can be an infinite loop: for each(x in ...); const x;
michael@0:     && !(codeL.match(/for.*in.*uneval/)) // can be slow to loop through the huge string uneval(this), for example
michael@0:     && !(codeL.match(/for.*for.*for/)) // nested for loops (including for..in, array comprehensions, etc) can take a while
michael@0:     && !(codeL.match(/for.*for.*gc/))
michael@0: }
michael@0: function whatToTestSpidermonkeyTrunk(code) {
michael@0:     var codeL = code.replace(/\s/g, " ");
michael@0:     return {
michael@0:         allowParse: true,
michael@0:         allowExec: unlikelyToHang(code),
michael@0:         allowIter: true,
michael@0:         expectConsistentOutput: true && code.indexOf("Date") == -1 // time marches on
michael@0:         && code.indexOf("random") == -1 && code.indexOf("dumpObject") == -1 // shows heap addresses
michael@0:         && code.indexOf("oomAfterAllocations") == -1 && code.indexOf("ParallelArray") == -1,
michael@0:         expectConsistentOutputAcrossIter: true && code.indexOf("options") == -1 // options() is per-cx, and the js shell doesn't create a new cx for each sandbox/compartment
michael@0:         ,
michael@0:         expectConsistentOutputAcrossJITs: true && code.indexOf("'strict") == -1 // bug 743425
michael@0:         && code.indexOf("preventExtensions") == -1 // bug 887521
michael@0:         && !(codeL.match(/\/.*[\u0000\u0080-\uffff]/)) // doesn't stay valid utf-8 after going through python (?)
michael@0:     };
michael@0: }
michael@0: function tryRunningDirectly(f, code, wtt) {
michael@0:     try {
michael@0:         eval(code);
michael@0:     } catch (e) {}
michael@0:     try {
michael@0:         var rv = f();
michael@0:         tryIteration(rv);
michael@0:     } catch (runError) {
michael@0:         var err = errorToString(runError);
michael@0:     }
michael@0:     tryEnsureSanity();
michael@0: }
michael@0: var realEval = eval;
michael@0: var realMath = Math;
michael@0: var realFunction = Function;
michael@0: var realGC = gc;
michael@0: var realUneval = uneval;
michael@0: function tryEnsureSanity() {
michael@0:     try {
michael@0:         delete this.Math;
michael@0:         delete this.Function;
michael@0:         delete this.gc;
michael@0:         delete this.uneval;
michael@0:         this.Math = realMath;
michael@0:         this.eval = realEval;
michael@0:         this.Function = realFunction;
michael@0:         this.gc = realGC;
michael@0:         this.uneval = realUneval;
michael@0:     } catch (e) {}
michael@0: }
michael@0: function tryIteration(rv) {
michael@0:     try {
michael@0:         var iterCount = 0;
michael@0:         for /* each */
michael@0:         ( /* let */ iterValue in rv)
michael@0:         print("Iterating succeeded, iterCount == " + iterCount);
michael@0:     } catch (iterError) {}
michael@0: }
michael@0: function failsToCompileInTry(code) {
michael@0:     try {
michael@0:         new Function(" try { " + code + " } catch(e) { }");
michael@0:     } catch (e) {}
michael@0: }
michael@0: function tryItOut(code) {
michael@0:     if (count % 1000 == 0) {
michael@0:         gc();
michael@0:     }
michael@0:     var wtt = whatToTestSpidermonkeyTrunk(code);
michael@0:     code = code.replace(/\/\*DUPTRY\d+\*\//, function(k) {
michael@0:         var n = parseInt(k.substr(8), 10);
michael@0:         print(n);
michael@0:         return strTimes("try{}catch(e){}", n);
michael@0:     })
michael@0:     try {
michael@0:         f = new Function(code);
michael@0:     } catch (compileError) {}
michael@0:     if (code.indexOf("\n") == -1 && code.indexOf("\r") == -1 && code.indexOf("\f") == -1 && code.indexOf("\0") == -1 && code.indexOf("\u2028") == -1 && code.indexOf("\u2029") == -1 && code.indexOf("<--") == -1 && code.indexOf("-->") == -1 && code.indexOf("//") == -1) {
michael@0:         var nCode = code;
michael@0:         if (nCode.indexOf("return") != -1 || nCode.indexOf("yield") != -1 || nCode.indexOf("const") != -1 || failsToCompileInTry(nCode)) nCode = "(function(){" + nCode + "})()"
michael@0:     }
michael@0:     tryRunning(f, code, false);
michael@0: }
michael@0: var count = 0;
michael@0: tryItOut("");
michael@0: count = 2
michael@0: tryItOut("");
michael@0: tryItOut("");
michael@0: tryItOut("o")
michael@0: tryItOut("")
michael@0: tryItOut("")
michael@0: tryItOut("\
michael@0:          with((/ /-7))\
michael@0:          {\
michael@0:          for(let mjcpxc=0;mjcpxc<9;++mjcpxc)\
michael@0:          {\
michael@0:          e=mjcpxc;\
michael@0:          yield/x/\
michael@0:          }}")
michael@0: