Environment-identity-01.js

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// The value of frame.environment is the same Environment object at different

// times within a single visit to a scope.

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

var dbg = Debugger(g);

g.eval("function h() { debugger; }");

var hits, env;

dbg.onDebuggerStatement = function (hframe) {

    var frame = hframe.older;

    var e = frame.environment;

    // frame.environment is at least cached from one moment to the next.

    assertEq(e, frame.environment);

    // frame.environment is cached from statement to statement within a call frame.

    if (env === undefined)

        env = e;

    else

        assertEq(e, env);

    hits++;

};

hits = 0;

env = undefined;

g.eval("function f() { (function () { var i = 0; h(); var j = 2; h(); })(); }");

g.f();

assertEq(hits, 2);

hits = 0;

env = undefined;

g.eval("function f2() { { let i = 0; h(); let j = 2; h(); } }");

g.f2();

assertEq(hits, 2);

hits = 0;

env = undefined;

g.eval("function f3() { { let i; for (i = 0; i < 2; i++) h(); } }");

g.f3();

assertEq(hits, 2);