diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Script-sourceMapURL.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Script-sourceMapURL.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,70 @@
+// Script.prototype.sourceMapURL can be a string or null.
+
+let g = newGlobal();
+let dbg = new Debugger;
+let gw = dbg.addDebuggee(g);
+
+function getSourceMapURL() {
+    let fw = gw.makeDebuggeeValue(g.f);
+    return fw.script.sourceMapURL;
+}
+
+// Without a source map
+g.evaluate("function f(x) { return 2*x; }");
+assertEq(getSourceMapURL(), null);
+
+// With a source map
+g.evaluate("function f(x) { return 2*x; }", {sourceMapURL: 'file:///var/foo.js.map'});
+assertEq(getSourceMapURL(), 'file:///var/foo.js.map');
+
+// Nested functions
+let fired = false;
+dbg.onDebuggerStatement = function (frame) {
+    fired = true;
+    assertEq(frame.script.sourceMapURL, 'file:///var/bar.js.map');
+};
+g.evaluate('(function () { (function () { debugger; })(); })();',
+           {sourceMapURL: 'file:///var/bar.js.map'});
+assertEq(fired, true);
+
+// Comment pragmas
+g.evaluate('function f() {}\n' +
+           '//# sourceMappingURL=file:///var/quux.js.map');
+assertEq(getSourceMapURL(), 'file:///var/quux.js.map');
+
+g.evaluate('function f() {}\n' +
+           '/*//# sourceMappingURL=file:///var/quux.js.map*/');
+assertEq(getSourceMapURL(), 'file:///var/quux.js.map');
+
+g.evaluate('function f() {}\n' +
+           '/*\n' +
+           '//# sourceMappingURL=file:///var/quux.js.map\n' +
+           '*/');
+assertEq(getSourceMapURL(), 'file:///var/quux.js.map');
+
+// Spaces are disallowed by the URL spec (they should have been
+// percent-encoded).
+g.evaluate('function f() {}\n' +
+           '//# sourceMappingURL=http://example.com/has illegal spaces.map');
+assertEq(getSourceMapURL(), 'http://example.com/has');
+
+// When the URL is missing, we don't set the sourceMapURL and we don't skip the
+// next line of input.
+g.evaluate('function f() {}\n' +
+           '//# sourceMappingURL=\n' +
+           'function z() {}');
+assertEq(getSourceMapURL(), null);
+assertEq('z' in g, true);
+
+// The last comment pragma we see should be the one which sets the source map's
+// URL.
+g.evaluate('function f() {}\n' +
+           '//# sourceMappingURL=http://example.com/foo.js.map\n' +
+           '//# sourceMappingURL=http://example.com/bar.js.map');
+assertEq(getSourceMapURL(), 'http://example.com/bar.js.map');
+
+// With both a comment and the evaluate option.
+g.evaluate('function f() {}\n' +
+           '//# sourceMappingURL=http://example.com/foo.js.map',
+           {sourceMapURL: 'http://example.com/bar.js.map'});
+assertEq(getSourceMapURL(), 'http://example.com/foo.js.map');