What does PerformEval mean?

#1

Mark wanted to disentangle the meaning of inputs to PerformEval and raised an example https://github.com/tc39/ecma262/pull/1504#discussion_r273709029

Given

const outerRealm = Realm.makeRootRealm();
const outerEval = outerRealm.global.eval;
const innerRealm = Realm.makeRootRealm();
const innerEval = innerRealm.global.eval;

For each of the following two cases, for the evaluation of the code ‘1+2’, what are the evalRealm, the callerRealm, the calleeRealm, the current realm:

direct eval:

outerEval('eval => eval("1 + 2;");')(innerEval);

indirect eval:

outerEval('innerEval => innerEval("1 + 2;");')(innerEval);
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