Comment #1 on issue 3212 by [email protected]: Type feedback is lost
on recompile with deoptimization support
http://code.google.com/p/v8/issues/detail?id=3212
When this bug is fixed, the following test should be added to
test-compiler.cc:
TEST(FeedbackVectorPreservedAcrossRecompiles) {
if (i::FLAG_always_opt || !i::FLAG_crankshaft) return;
i::FLAG_allow_natives_syntax = true;
CcTest::InitializeVM();
if (!CcTest::i_isolate()->use_crankshaft()) return;
v8::HandleScope scope(CcTest::isolate());
// Make sure function f has a call that uses a type feedback slot.
CompileRun("function fun() {};"
"fun1 = fun;"
"function f(a) { a(); } f(fun1);");
Handle<JSFunction> f =
v8::Utils::OpenHandle(
*v8::Handle<v8::Function>::Cast(
CcTest::global()->Get(v8_str("f"))));
// We shouldn't have deoptimization support. We want to recompile and
// verify that our feedback vector preserves information.
CHECK(!f->shared()->has_deoptimization_support());
Handle<FixedArray> feedback_vector(f->shared()->feedback_vector());
// Verify that we gathered feedback.
CHECK_EQ(1, feedback_vector->length());
CHECK(feedback_vector->get(0)->IsJSFunction());
CompileRun("%OptimizeFunctionOnNextCall(f); f(fun1);");
// Verify that the feedback is still "gathered" despite a recompilation
// of the full code.
CHECK(f->shared()->has_deoptimization_support());
CHECK(f->shared()->feedback_vector()->get(0)->IsJSFunction());
}
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