Script-isInCatchScope.js

Enable keyboard shortcuts

// Test if isInCatchScope properly detects catch blocks.

let g = newGlobal({newCompartment: true});

let dbg = new Debugger(g);

function test(string, mustBeCaught) {

    let index = 0;

    dbg.onExceptionUnwind = function (frame) {

        let willBeCaught = false;

        do {

            if (frame.script.isInCatchScope(frame.offset)) {

                willBeCaught = true;

                break;

            frame = frame.older;

        } while (frame != null);

        assertEq(willBeCaught, mustBeCaught[index++]);

};

    try {

        g.eval(string);

    } catch (ex) {}

    assertEq(index, mustBeCaught.length);

// Should correctly detect catch blocks

test("throw new Error();", [false]);

test("try { throw new Error(); } catch (e) {}", [true]);

test("try { throw new Error(); } finally {}", [false, false]);

test("try { throw new Error(); } catch (e) {} finally {}", [true]);

// Source of the exception shouldn't matter

test("(null)();", [false]);

test("try { (null)(); } catch (e) {}", [true]);

test("try { (null)(); } finally {}", [false, false]);

test("try { (null)(); } catch (e) {} finally {}", [true]);

// Should correctly detect catch blocks in functions

test("function f() { throw new Error(); } f();", [false, false]);

test("function f() { try { throw new Error(); } catch (e) {} } f();", [true]);

test("function f() { try { throw new Error(); } finally {} } f();", [false, false, false]);

test("function f() { try { throw new Error(); } catch (e) {} finally {} } f();", [true]);

// Should correctly detect catch blocks in evals

test("eval('throw new Error();')", [false, false]);

test("eval('try { throw new Error(); } catch (e) {}');", [true]);

test("eval('try { throw new Error(); } finally {}');", [false, false, false]);

test("eval('try { throw new Error(); } catch (e) {} finally {}');", [true]);

// Should correctly detect rethrows

test("try { throw new Error(); } catch (e) { throw e; }", [true, false]);

test("try { try { throw new Error(); } catch (e) { throw e; } } catch (e) {}", [true, true]);

test("try { try { throw new Error(); } finally {} } catch (e) {}", [true, true]);

test("function f() { try { throw new Error(); } catch (e) { throw e; } } f();", [true, false, false]);

test("function f() { try { try { throw new Error(); } catch (e) { throw e; } } catch (e) {} } f();", [true, true]);

test("function f() { try { try { throw new Error(); } finally {} } catch (e) {} } f();", [true, true]);

test("eval('try { throw new Error(); } catch (e) { throw e; }')", [true, false, false]);

test("eval('try { try { throw new Error(); } catch (e) { throw e; } } catch (e) {}')", [true, true]);

// Should correctly detect catch blocks across frame boundaries

test("function f() { throw new Error(); } try { f(); } catch (e) {}", [true, true]);

test("function f() { throw new Error(); } try { f(); } catch (e) { throw e; }", [true, true, false]);

test("try { eval('throw new Error()'); } catch (e) {}", [true, true]);

test("try { eval('throw new Error()'); } catch (e) { throw e; }", [true, true, false]);

// Should correctly detect catch blocks just before and just after throws

test("throw new Error; try {} catch (e) {}", [false]);

test("try {} catch (e) {} throw new Error();", [false]);