On Mon, Aug 26, 2019 at 12:02 AM Henri Sivonen <hsivo...@mozilla.com> wrote:
> If in a plain mochitest I do > var rope = > SpecialPowers.Cu.getJSTestingFunctions().newRope(t.head, t.tail); > var encoded = (new TextEncoder()).encode(rope); > the encode() method doesn't see the rope. Instead, the call to > encode() sees a linear string that was materialized by a copy in a > cross-compartment wrapper. > > Does SpecialPowers always introduce a compartment boundary in a plain > mochitest? For posterity: It does. Components.utils can't be exposed to an unprivileged content compartment directly. > In what type of test does > SpecialPowers.Cu.getJSTestingFunctions().newRope() actually return a > rope within the calling compartment such that passing the rope to a > WebIDL API really makes the rope enter the WebIDL bindings instead of > getting intercepted by a cross-compartment wrapper first? > > Alternatively: What kind of string lengths should I use with normal JS > string concatenation to be sure that I get a rope instead of the right > operand getting copied into an extensible left operand? > > -- > Henri Sivonen > hsivo...@mozilla.com > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
