1 files changed, 78 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-lines-01.js b/js/src/jit-test/tests/debug/Frame-onStep-lines-01.js
new file mode 100644
index 0000000000..a32a0535da
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+++ b/js/src/jit-test/tests/debug/Frame-onStep-lines-01.js
@@ -0,0 +1,78 @@
+// Test that a frame's onStep handler gets called at least once on each line of a function.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+
+// When we hit a 'debugger' statement, set offsets to the frame's script's
+// table of line offsets --- a sparse array indexed by line number. Begin
+// single-stepping the current frame; for each source line we hit, delete
+// the line's entry in offsets. Thus, at the end, offsets is an array with
+// an element for each line we did not reach.
+var doSingleStep = true;
+var offsets;
+dbg.onDebuggerStatement = function (frame) {
+    var script = frame.script;
+    offsets = script.getAllOffsets();
+    print("debugger line: " + script.getOffsetLocation(frame.offset).lineNumber);
+    print("original lines: " + JSON.stringify(Object.keys(offsets)));
+    if (doSingleStep) {
+	frame.onStep = function onStepHandler() {
+	    var line = script.getOffsetLocation(this.offset).lineNumber;
+	    delete offsets[line];
+	};
+    }
+};
+
+g.eval(
+       'function t(a, b, c) {                \n' +
+       '    debugger;                        \n' +
+       '    var x = a;                       \n' +
+       '    x += b;                          \n' +
+       '    if (x < 10)                      \n' +
+       '        x -= c;                      \n' +
+       '    return x;                        \n' +
+       '}                                    \n'
+       );
+
+// This should stop at every line but the first of the function.
+g.eval('t(1,2,3)');
+assertEq(Object.keys(offsets).length, 1);
+
+// This should stop at every line but the first of the function, and the
+// body of the 'if'.
+g.eval('t(10,20,30)');
+assertEq(Object.keys(offsets).length, 2);
+
+// This shouldn't stop at all. It's the frame that's in single-step mode,
+// not the script, so the prior execution of t in single-step mode should
+// have no effect on this one.
+doSingleStep = false;
+g.eval('t(0, 0, 0)');
+assertEq(Object.keys(offsets).length, 7);
+doSingleStep = true;
+
+// Single-step in an eval frame. This should reach every line but the
+// first.
+g.eval(
+       'debugger;                        \n' +
+       'var a=1, b=2, c=3;               \n' +
+       'var x = a;                       \n' +
+       'x += b;                          \n' +
+       'if (x < 10)                      \n' +
+       '    x -= c;                      \n'
+       );
+print("final lines: " + JSON.stringify(Object.keys(offsets)));
+assertEq(Object.keys(offsets).length, 1);
+
+// Single-step in a global code frame. This should reach every line but the
+// first.
+g.evaluate(
+           'debugger;                        \n' +
+           'var a=1, b=2, c=3;               \n' +
+           'var x = a;                       \n' +
+           'x += b;                          \n' +
+           'if (x < 10)                      \n' +
+           '    x -= c;                      \n'
+           );
+print("final lines: " + JSON.stringify(Object.keys(offsets)));
+assertEq(Object.keys(offsets).length, 1);