michael@0: // When there are multiple debuggers, their hooks are called in order.
michael@0: 
michael@0: var g = newGlobal();
michael@0: var log;
michael@0: var arr = [];
michael@0: 
michael@0: function addDebug(msg) {
michael@0:     var dbg = new Debugger(g);
michael@0:     dbg.onDebuggerStatement = function (stack) { log += msg; };
michael@0:     arr.push(dbg);
michael@0: }
michael@0: 
michael@0: addDebug('a');
michael@0: addDebug('b');
michael@0: addDebug('c');
michael@0: 
michael@0: log = '';
michael@0: assertEq(g.eval("debugger; 0;"), 0);
michael@0: assertEq(log, 'abc');
michael@0: 
michael@0: // Calling debugger hooks stops as soon as any hook returns a resumption value
michael@0: // other than undefined.
michael@0: 
michael@0: arr[0].onDebuggerStatement = function (stack) {
michael@0:     log += 'a';
michael@0:     return {return: 1};
michael@0: };
michael@0: 
michael@0: log = '';
michael@0: assertEq(g.eval("debugger; 0;"), 1);
michael@0: assertEq(log, 'a');