Debugger-onNativeCall-02.js (1295B)
1 // Test that the onNativeCall hook can control the call's behavior. 2 3 var g = newGlobal({newCompartment: true}); 4 var dbg = Debugger(g); 5 var gdbg = dbg.addDebuggee(g); 6 7 g.eval(` 8 var x = []; 9 Object.defineProperty(x, "a", { 10 get: print, 11 set: print, 12 }); 13 var rv; 14 function f() { 15 x.a++; 16 try { 17 rv = x.push(4); 18 } catch (e) { 19 throw "rethrowing"; 20 } 21 } 22 `); 23 24 for (let i = 0; i < 5; i++) { 25 g.f(); 26 } 27 28 for (let i = 0; i < 5; i++) { 29 // Test terminating execution. 30 dbg.onNativeCall = (callee, reason) => { 31 return null; 32 }; 33 const len = g.x.length; 34 let v = gdbg.executeInGlobal(`f()`); 35 assertEq(v, null); 36 assertEq(g.x.length, len); 37 38 // Test throwing an exception. 39 dbg.onNativeCall = (callee, reason) => { 40 return { throw: "throwing" }; 41 }; 42 v = gdbg.executeInGlobal(`f()`); 43 assertEq(v.throw, "throwing"); 44 45 // Test throwing an exception #2. 46 dbg.onNativeCall = (callee, reason) => { 47 if (callee.name == "push") { 48 return { throw: "throwing" }; 49 } 50 }; 51 v = gdbg.executeInGlobal(`f()`); 52 assertEq(v.throw, "rethrowing"); 53 54 // Test returning a different value from the native. 55 dbg.onNativeCall = (callee, reason) => { 56 return { return: "value" }; 57 }; 58 v = gdbg.executeInGlobal(`f()`); 59 assertEq(v.return, undefined); 60 assertEq(g.rv, "value"); 61 }