v8/test/cctest/test-feedback-vector.cc
2014-10-20 17:32:06 +00:00

140 lines
5.1 KiB
C++

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/v8.h"
#include "test/cctest/cctest.h"
#include "src/api.h"
#include "src/debug.h"
#include "src/execution.h"
#include "src/factory.h"
#include "src/global-handles.h"
#include "src/macro-assembler.h"
#include "src/objects.h"
using namespace v8::internal;
namespace {
TEST(VectorStructure) {
LocalContext context;
v8::HandleScope scope(context->GetIsolate());
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
// Empty vectors are the empty fixed array.
Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(0, 0);
CHECK(Handle<FixedArray>::cast(vector)
.is_identical_to(factory->empty_fixed_array()));
// Which can nonetheless be queried.
CHECK_EQ(0, vector->ic_with_type_info_count());
CHECK_EQ(0, vector->ic_generic_count());
CHECK_EQ(0, vector->Slots());
CHECK_EQ(0, vector->ICSlots());
vector = factory->NewTypeFeedbackVector(1, 0);
CHECK_EQ(1, vector->Slots());
CHECK_EQ(0, vector->ICSlots());
vector = factory->NewTypeFeedbackVector(0, 1);
CHECK_EQ(0, vector->Slots());
CHECK_EQ(1, vector->ICSlots());
vector = factory->NewTypeFeedbackVector(3, 5);
CHECK_EQ(3, vector->Slots());
CHECK_EQ(5, vector->ICSlots());
int index = vector->GetIndex(FeedbackVectorSlot(0));
CHECK_EQ(TypeFeedbackVector::kReservedIndexCount, index);
CHECK(FeedbackVectorSlot(0) == vector->ToSlot(index));
index = vector->GetIndex(FeedbackVectorICSlot(0));
CHECK_EQ(index, TypeFeedbackVector::kReservedIndexCount + 3);
CHECK(FeedbackVectorICSlot(0) == vector->ToICSlot(index));
CHECK_EQ(TypeFeedbackVector::kReservedIndexCount + 3 + 5, vector->length());
}
TEST(VectorSlotClearing) {
LocalContext context;
v8::HandleScope scope(context->GetIsolate());
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
// We only test clearing FeedbackVectorSlots, not FeedbackVectorICSlots.
// The reason is that FeedbackVectorICSlots need a full code environment
// to fully test (See VectorICProfilerStatistics test below).
Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(5, 0);
// Fill with information
vector->Set(FeedbackVectorSlot(0), Smi::FromInt(1));
vector->Set(FeedbackVectorSlot(1), *factory->fixed_array_map());
Handle<AllocationSite> site = factory->NewAllocationSite();
vector->Set(FeedbackVectorSlot(2), *site);
vector->ClearSlots(NULL);
// The feedback vector slots are cleared. AllocationSites are granted
// an exemption from clearing, as are smis.
CHECK_EQ(Smi::FromInt(1), vector->Get(FeedbackVectorSlot(0)));
CHECK_EQ(*TypeFeedbackVector::UninitializedSentinel(isolate),
vector->Get(FeedbackVectorSlot(1)));
CHECK(vector->Get(FeedbackVectorSlot(2))->IsAllocationSite());
}
TEST(VectorICProfilerStatistics) {
if (i::FLAG_always_opt) return;
CcTest::InitializeVM();
LocalContext context;
v8::HandleScope scope(context->GetIsolate());
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
// Make sure function f has a call that uses a type feedback slot.
CompileRun(
"function fun() {};"
"function f(a) { a(); } f(fun);");
Handle<JSFunction> f = v8::Utils::OpenHandle(
*v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
// There should be one IC.
Code* code = f->shared()->code();
TypeFeedbackInfo* feedback_info =
TypeFeedbackInfo::cast(code->type_feedback_info());
CHECK_EQ(1, feedback_info->ic_total_count());
CHECK_EQ(0, feedback_info->ic_with_type_info_count());
CHECK_EQ(0, feedback_info->ic_generic_count());
TypeFeedbackVector* feedback_vector = f->shared()->feedback_vector();
CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
CHECK_EQ(0, feedback_vector->ic_generic_count());
// Now send the information generic.
CompileRun("f(Object);");
feedback_vector = f->shared()->feedback_vector();
CHECK_EQ(0, feedback_vector->ic_with_type_info_count());
CHECK_EQ(1, feedback_vector->ic_generic_count());
// A collection will make the site uninitialized again.
heap->CollectAllGarbage(i::Heap::kNoGCFlags);
feedback_vector = f->shared()->feedback_vector();
CHECK_EQ(0, feedback_vector->ic_with_type_info_count());
CHECK_EQ(0, feedback_vector->ic_generic_count());
// The Array function is special. A call to array remains monomorphic
// and isn't cleared by gc because an AllocationSite is being held.
CompileRun("f(Array);");
feedback_vector = f->shared()->feedback_vector();
CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
CHECK_EQ(0, feedback_vector->ic_generic_count());
CHECK(feedback_vector->Get(FeedbackVectorICSlot(0))->IsAllocationSite());
heap->CollectAllGarbage(i::Heap::kNoGCFlags);
feedback_vector = f->shared()->feedback_vector();
CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
CHECK_EQ(0, feedback_vector->ic_generic_count());
CHECK(feedback_vector->Get(FeedbackVectorICSlot(0))->IsAllocationSite());
}
}