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// Functions for checking results returned by
// Debugger.Memory.prototype.takeCensus and
// HeapSnapshot.prototype.takeCensus. Adapted from js/src/jit-test/lib/census.js.
export const Census = {};
function dumpn(msg) {
dump("DBG-TEST: Census.jsm: " + msg + "\n");
}
// Census.walkCensus(subject, name, walker)
//
// Use |walker| to check |subject|, a census object of the sort returned by
// Debugger.Memory.prototype.takeCensus: a tree of objects with integers at the
// leaves. Use |name| as the name for |subject| in diagnostic messages. Return
// the number of leaves of |subject| we visited.
//
// A walker is an object with three methods:
//
// - enter(prop): Return the walker we should use to check the property of the
// subject census named |prop|. This is for recursing into the subobjects of
// the subject.
//
// - done(): Called after we have called 'enter' on every property of the
// subject.
//
// - check(value): Check |value|, a leaf in the subject.
//
// Walker methods are expected to simply throw if a node we visit doesn't look
// right.
Census.walkCensus = (subject, name, walker) => walk(subject, name, walker, 0);
function walk(subject, name, walker, count) {
if (typeof subject === "object") {
dumpn(name);
for (const prop in subject) {
count = walk(
subject[prop],
name + "[" + uneval(prop) + "]",
walker.enter(prop),
count
);
}
walker.done();
} else {
dumpn(name + " = " + uneval(subject));
walker.check(subject);
count++;
}
return count;
}
// A walker that doesn't check anything.
Census.walkAnything = {
enter: () => Census.walkAnything,
done: () => undefined,
check: () => undefined,
};
// A walker that requires all leaves to be zeros.
Census.assertAllZeros = {
enter: () => Census.assertAllZeros,
done: () => undefined,
check: elt => {
if (elt !== 0) {
throw new Error("Census mismatch: expected zero, found " + elt);
}
},
};
function expectedObject() {
throw new Error(
"Census mismatch: subject has leaf where basis has nested object"
);
}
function expectedLeaf() {
throw new Error(
"Census mismatch: subject has nested object where basis has leaf"
);
}
// Return a function that, given a 'basis' census, returns a census walker that
// compares the subject census against the basis. The returned walker calls the
// given |compare|, |missing|, and |extra| functions as follows:
//
// - compare(subjectLeaf, basisLeaf): Check a leaf of the subject against the
// corresponding leaf of the basis.
//
// - missing(prop, value): Called when the subject is missing a property named
// |prop| which is present in the basis with value |value|.
//
// - extra(prop): Called when the subject has a property named |prop|, but the
// basis has no such property. This should return a walker that can check
// the subject's value.
function makeBasisChecker({ compare, missing, extra }) {
return function makeWalker(basis) {
if (typeof basis === "object") {
const unvisited = new Set(Object.getOwnPropertyNames(basis));
return {
enter: prop => {
unvisited.delete(prop);
if (prop in basis) {
return makeWalker(basis[prop]);
}
return extra(prop);
},
done: () => unvisited.forEach(prop => missing(prop, basis[prop])),
check: expectedObject,
};
}
return {
enter: expectedLeaf,
done: expectedLeaf,
check: elt => compare(elt, basis),
};
};
}
function missingProp(prop) {
throw new Error(
"Census mismatch: subject lacks property present in basis: " + prop
);
}
function extraProp(prop) {
throw new Error(
"Census mismatch: subject has property not present in basis: " + prop
);
}
// Return a walker that checks that the subject census has counts all equal to
// |basis|.
Census.assertAllEqual = makeBasisChecker({
compare: (a, b) => {
if (a !== b) {
throw new Error("Census mismatch: expected " + a + " got " + b);
}
},
missing: missingProp,
extra: extraProp,
});
function ok(val) {
if (!val) {
throw new Error("Census mismatch: expected truthy, got " + val);
}
}
// Return a walker that checks that the subject census has at least as many
// items of each category as |basis|.
Census.assertAllNotLessThan = makeBasisChecker({
compare: (subject, basis) => ok(subject >= basis),
missing: missingProp,
extra: () => Census.walkAnything,
});
// Return a walker that checks that the subject census has at most as many
// items of each category as |basis|.
Census.assertAllNotMoreThan = makeBasisChecker({
compare: (subject, basis) => ok(subject <= basis),
missing: missingProp,
extra: () => Census.walkAnything,
});
// Return a walker that checks that the subject census has within |fudge|
// items of each category of the count in |basis|.
Census.assertAllWithin = function (fudge, basis) {
return makeBasisChecker({
compare: (subject, base) => ok(Math.abs(subject - base) <= fudge),
missing: missingProp,
extra: () => Census.walkAnything,
})(basis);
};
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