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Bug 1445973: Part 2: Add 'clearSavedFrames' testing function to JS shell. r=jorendorff

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OOM tests often depend on invoking a function repeatedly, failing a different
allocation each time. Flushing the caches helps ensure consistent behavior from
one invocation to the next.

--HG--
extra : rebase_source : 0bf4a46c7c3e0bceb0fe77bbf96e422558a988c4
extra : source : 1a11067ab1e6b62602b79081e3208dcad31807bd
This commit is contained in:
Jim Blandy 2018-04-06 11:33:57 -07:00
parent 663b9d62d5
commit 8490101998
1 changed files with 23 additions and 0 deletions
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23
js/src/builtin/TestingFunctions.cpp
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@ -1241,6 +1241,23 @@ GetSavedFrameCount(JSContext* cx, unsigned argc, Value* vp)
return true;
}
static bool
ClearSavedFrames(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
js::SavedStacks& savedStacks = cx->compartment()->savedStacks();
if (savedStacks.initialized())
savedStacks.clear();
for (ActivationIterator iter(cx); !iter.done(); ++iter) {
iter->clearLiveSavedFrameCache();
}
args.rval().setUndefined();
return true;
}
static bool
SaveStack(JSContext* cx, unsigned argc, Value* vp)
{
@ -5170,6 +5187,12 @@ static const JSFunctionSpecWithHelp TestingFunctions[] = {
" Return the number of SavedFrame instances stored in this compartment's\n"
" SavedStacks cache."),
JS_FN_HELP("clearSavedFrames", ClearSavedFrames, 0, 0,
"clearSavedFrames()",
" Empty the current compartment's cache of SavedFrame objects, so that\n"
" subsequent stack captures allocate fresh objects to represent frames.\n"
" Clear the current stack's LiveSavedFrameCaches."),
JS_FN_HELP("saveStack", SaveStack, 0, 0,
"saveStack([maxDepth [, compartment]])",
" Capture a stack. If 'maxDepth' is given, capture at most 'maxDepth' number\n"