1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/debugger-frames.js b/js/src/jit-test/tests/modules/debugger-frames.js
new file mode 100644
index 0000000000..c343627d51
--- /dev/null
+++ b/js/src/jit-test/tests/modules/debugger-frames.js
@@ -0,0 +1,83 @@
+// Test debugger access to frames and environments work as expected inside a module.
+
+load(libdir + "asserts.js");
+
+function assertArrayEq(actual, expected)
+{
+    var eq = actual.length == expected.length;
+    if (eq) {
+        for (var i = 0; i < actual.length; i++) {
+            if (actual[i] !== expected[i]) {
+                eq = false;
+                break;
+            }
+        }
+    }
+    if (!eq) {
+        print("Assertion failed: got " + JSON.stringify(actual) +
+              ", expected " + JSON.stringify(expected));
+        quit(3);
+    }
+}
+
+var g2 = newGlobal({newCompartment: true});
+
+var dbg = Debugger(g2);
+dbg.onDebuggerStatement = function (frame) {
+    // The current frame is a module frame.
+    assertEq(frame.type, 'module');
+    assertEq(frame.this, undefined);
+
+    // The frame's environement is a module environment.
+    let env = frame.environment;
+    assertEq(env.type, 'declarative');
+    assertEq(env.calleeScript, null);
+
+    // Top level module definitions and imports are visible.
+    assertArrayEq(env.names().sort(), ['a', 'b', 'c', 'x', 'y', 'z']);
+    assertArrayEq(['a', 'b', 'c'].map(env.getVariable, env), [1, 2, 3]);
+    assertArrayEq(['x', 'y', 'z'].map(env.getVariable, env), [4, 5, 6]);
+
+    // Cannot set imports or const bindings.
+    assertThrowsInstanceOf(() => env.setVariable('a', 10), TypeError);
+    assertThrowsInstanceOf(() => env.setVariable('b', 11), TypeError);
+    assertThrowsInstanceOf(() => env.setVariable('c', 12), TypeError);
+    env.setVariable('x', 7);
+    env.setVariable('y', 8);
+    assertThrowsInstanceOf(() => env.setVariable('z', 9), TypeError);
+    assertArrayEq(['a', 'b', 'c'].map(env.getVariable, env), [1, 2, 3]);
+    assertArrayEq(['x', 'y', 'z'].map(env.getVariable, env), [7, 8, 6]);
+
+    // The global lexical is the next thing after the module on the scope chain,
+    // followed by the global.
+    assertEq(env.parent.type, 'declarative');
+    assertEq(env.parent.parent.type, 'object');
+    assertEq(env.parent.parent.parent, null);
+};
+
+f = g2.eval(
+`
+    // Set up a module to import from.
+    a = registerModule('a', parseModule(
+    \`
+        export var a = 1;
+        export let b = 2;
+        export const c = 3;
+        export function f(x) { return x + 1; }
+    \`));
+    moduleLink(a);
+    moduleEvaluate(a);
+
+    let m = parseModule(
+    \`
+        import { a, b, c } from 'a';
+        var x = 4;
+        let y = 5;
+        const z = 6;
+
+        eval("");
+        debugger;
+    \`);
+    moduleLink(m);
+    moduleEvaluate(m);
+`);