1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
6 #include "test/cctest/cctest.h"
10 #include "src/execution.h"
11 #include "src/factory.h"
12 #include "src/global-handles.h"
13 #include "src/macro-assembler.h"
14 #include "src/objects.h"
16 using namespace v8::internal;
20 TEST(VectorStructure) {
22 v8::HandleScope scope(context->GetIsolate());
23 Isolate* isolate = CcTest::i_isolate();
24 Factory* factory = isolate->factory();
25 Zone* zone = isolate->runtime_zone();
27 // Empty vectors are the empty fixed array.
28 FeedbackVectorSpec empty;
29 Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(&empty);
30 CHECK(Handle<FixedArray>::cast(vector)
31 .is_identical_to(factory->empty_fixed_array()));
32 // Which can nonetheless be queried.
33 CHECK_EQ(0, vector->ic_with_type_info_count());
34 CHECK_EQ(0, vector->ic_generic_count());
35 CHECK_EQ(0, vector->Slots());
36 CHECK_EQ(0, vector->ICSlots());
38 FeedbackVectorSpec one_slot(1);
39 vector = factory->NewTypeFeedbackVector(&one_slot);
40 CHECK_EQ(1, vector->Slots());
41 CHECK_EQ(0, vector->ICSlots());
43 FeedbackVectorSpec one_icslot(0, Code::CALL_IC);
44 vector = factory->NewTypeFeedbackVector(&one_icslot);
45 CHECK_EQ(0, vector->Slots());
46 CHECK_EQ(1, vector->ICSlots());
48 ZoneFeedbackVectorSpec spec(zone, 3, 5);
49 for (int i = 0; i < 5; i++) spec.SetKind(i, Code::CALL_IC);
50 vector = factory->NewTypeFeedbackVector(&spec);
51 CHECK_EQ(3, vector->Slots());
52 CHECK_EQ(5, vector->ICSlots());
54 int metadata_length = vector->ic_metadata_length();
55 CHECK(metadata_length > 0);
57 int index = vector->GetIndex(FeedbackVectorSlot(0));
59 CHECK_EQ(TypeFeedbackVector::kReservedIndexCount + metadata_length, index);
60 CHECK(FeedbackVectorSlot(0) == vector->ToSlot(index));
62 index = vector->GetIndex(FeedbackVectorICSlot(0));
64 TypeFeedbackVector::kReservedIndexCount + metadata_length + 3);
65 CHECK(FeedbackVectorICSlot(0) == vector->ToICSlot(index));
66 CHECK_EQ(TypeFeedbackVector::kReservedIndexCount + metadata_length + 3 +
67 5 * TypeFeedbackVector::elements_per_ic_slot(),
72 // IC slots need an encoding to recognize what is in there.
73 TEST(VectorICMetadata) {
75 v8::HandleScope scope(context->GetIsolate());
76 Isolate* isolate = CcTest::i_isolate();
77 Factory* factory = isolate->factory();
78 Zone* zone = isolate->runtime_zone();
80 ZoneFeedbackVectorSpec spec(zone, 10, 3 * 10);
82 for (int i = 0; i < 30; i++) {
86 } else if (i % 3 == 1) {
89 kind = Code::KEYED_LOAD_IC;
91 spec.SetKind(i, kind);
94 Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(&spec);
95 CHECK_EQ(10, vector->Slots());
96 CHECK_EQ(3 * 10, vector->ICSlots());
98 // Meanwhile set some feedback values and type feedback values to
99 // verify the data structure remains intact.
100 vector->change_ic_with_type_info_count(100);
101 vector->change_ic_generic_count(3333);
102 vector->Set(FeedbackVectorSlot(0), *vector);
104 // Verify the metadata is correctly set up from the spec.
105 for (int i = 0; i < 30; i++) {
106 Code::Kind kind = vector->GetKind(FeedbackVectorICSlot(i));
108 CHECK_EQ(Code::CALL_IC, kind);
109 } else if (i % 3 == 1) {
110 CHECK_EQ(Code::LOAD_IC, kind);
112 CHECK_EQ(Code::KEYED_LOAD_IC, kind);
118 TEST(VectorSlotClearing) {
119 LocalContext context;
120 v8::HandleScope scope(context->GetIsolate());
121 Isolate* isolate = CcTest::i_isolate();
122 Factory* factory = isolate->factory();
124 // We only test clearing FeedbackVectorSlots, not FeedbackVectorICSlots.
125 // The reason is that FeedbackVectorICSlots need a full code environment
126 // to fully test (See VectorICProfilerStatistics test below).
127 FeedbackVectorSpec spec(5);
128 Handle<TypeFeedbackVector> vector = factory->NewTypeFeedbackVector(&spec);
130 // Fill with information
131 vector->Set(FeedbackVectorSlot(0), Smi::FromInt(1));
132 Handle<WeakCell> cell = factory->NewWeakCell(factory->fixed_array_map());
133 vector->Set(FeedbackVectorSlot(1), *cell);
134 Handle<AllocationSite> site = factory->NewAllocationSite();
135 vector->Set(FeedbackVectorSlot(2), *site);
137 // GC time clearing leaves slots alone.
138 vector->ClearSlotsAtGCTime(NULL);
139 Object* obj = vector->Get(FeedbackVectorSlot(1));
140 CHECK(obj->IsWeakCell() && !WeakCell::cast(obj)->cleared());
142 vector->ClearSlots(NULL);
144 // The feedback vector slots are cleared. AllocationSites are still granted
145 // an exemption from clearing, as are smis.
146 CHECK_EQ(Smi::FromInt(1), vector->Get(FeedbackVectorSlot(0)));
147 CHECK_EQ(*TypeFeedbackVector::UninitializedSentinel(isolate),
148 vector->Get(FeedbackVectorSlot(1)));
149 CHECK(vector->Get(FeedbackVectorSlot(2))->IsAllocationSite());
153 TEST(VectorICProfilerStatistics) {
154 if (i::FLAG_always_opt) return;
155 CcTest::InitializeVM();
156 LocalContext context;
157 v8::HandleScope scope(context->GetIsolate());
158 Isolate* isolate = CcTest::i_isolate();
159 Heap* heap = isolate->heap();
161 // Make sure function f has a call that uses a type feedback slot.
164 "function f(a) { a(); } f(fun);");
165 Handle<JSFunction> f = v8::Utils::OpenHandle(
166 *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
167 // There should be one IC.
168 Handle<Code> code = handle(f->shared()->code(), isolate);
169 TypeFeedbackInfo* feedback_info =
170 TypeFeedbackInfo::cast(code->type_feedback_info());
171 CHECK_EQ(1, feedback_info->ic_total_count());
172 CHECK_EQ(0, feedback_info->ic_with_type_info_count());
173 CHECK_EQ(0, feedback_info->ic_generic_count());
174 Handle<TypeFeedbackVector> feedback_vector =
175 handle(f->shared()->feedback_vector(), isolate);
177 CallICNexus nexus(feedback_vector, FeedbackVectorICSlot(ic_slot));
178 CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
179 CHECK_EQ(0, feedback_vector->ic_generic_count());
181 // Now send the information generic.
182 CompileRun("f(Object);");
183 CHECK_EQ(0, feedback_vector->ic_with_type_info_count());
184 CHECK_EQ(1, feedback_vector->ic_generic_count());
186 // A collection will not affect the site.
187 heap->CollectAllGarbage();
188 CHECK_EQ(0, feedback_vector->ic_with_type_info_count());
189 CHECK_EQ(1, feedback_vector->ic_generic_count());
191 // The Array function is special. A call to array remains monomorphic
192 // and isn't cleared by gc because an AllocationSite is being held.
193 // Clear the IC manually in order to test this case.
195 CompileRun("f(Array);");
196 CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
197 CHECK_EQ(0, feedback_vector->ic_generic_count());
200 CHECK(nexus.GetFeedback()->IsAllocationSite());
201 heap->CollectAllGarbage();
202 CHECK_EQ(1, feedback_vector->ic_with_type_info_count());
203 CHECK_EQ(0, feedback_vector->ic_generic_count());
204 CHECK(nexus.GetFeedback()->IsAllocationSite());
208 TEST(VectorCallICStates) {
209 if (i::FLAG_always_opt) return;
210 CcTest::InitializeVM();
211 LocalContext context;
212 v8::HandleScope scope(context->GetIsolate());
213 Isolate* isolate = CcTest::i_isolate();
214 Heap* heap = isolate->heap();
216 // Make sure function f has a call that uses a type feedback slot.
218 "function foo() { return 17; }"
219 "function f(a) { a(); } f(foo);");
220 Handle<JSFunction> f = v8::Utils::OpenHandle(
221 *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
222 // There should be one IC.
223 Handle<TypeFeedbackVector> feedback_vector =
224 Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
225 FeedbackVectorICSlot slot(1);
226 CallICNexus nexus(feedback_vector, slot);
227 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
228 // CallIC doesn't return map feedback.
229 CHECK(!nexus.FindFirstMap());
231 CompileRun("f(function() { return 16; })");
232 CHECK_EQ(GENERIC, nexus.StateFromFeedback());
234 // After a collection, state should remain GENERIC.
235 heap->CollectAllGarbage();
236 CHECK_EQ(GENERIC, nexus.StateFromFeedback());
238 // A call to Array is special, it contains an AllocationSite as feedback.
239 // Clear the IC manually in order to test this case.
240 nexus.Clear(f->shared()->code());
241 CompileRun("f(Array)");
242 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
243 CHECK(nexus.GetFeedback()->IsAllocationSite());
245 heap->CollectAllGarbage();
246 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
250 TEST(VectorLoadICStates) {
251 if (i::FLAG_always_opt) return;
252 CcTest::InitializeVM();
253 LocalContext context;
254 v8::HandleScope scope(context->GetIsolate());
255 Isolate* isolate = CcTest::i_isolate();
256 Heap* heap = isolate->heap();
258 // Make sure function f has a call that uses a type feedback slot.
260 "var o = { foo: 3 };"
261 "function f(a) { return a.foo; } f(o);");
262 Handle<JSFunction> f = v8::Utils::OpenHandle(
263 *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
264 // There should be one IC.
265 Handle<TypeFeedbackVector> feedback_vector =
266 Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
267 FeedbackVectorICSlot slot(1);
268 LoadICNexus nexus(feedback_vector, slot);
269 CHECK_EQ(PREMONOMORPHIC, nexus.StateFromFeedback());
272 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
273 // Verify that the monomorphic map is the one we expect.
274 Handle<JSObject> o = v8::Utils::OpenHandle(
275 *v8::Handle<v8::Object>::Cast(CcTest::global()->Get(v8_str("o"))));
276 CHECK_EQ(o->map(), nexus.FindFirstMap());
278 // Now go polymorphic.
279 CompileRun("f({ blarg: 3, foo: 2 })");
280 CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
285 CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
287 CompileRun("f({ blarg: 3, torino: 10, foo: 2 })");
288 CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
290 nexus.FindAllMaps(&maps);
291 CHECK_EQ(4, maps.length());
293 // Finally driven megamorphic.
294 CompileRun("f({ blarg: 3, gran: 3, torino: 10, foo: 2 })");
295 CHECK_EQ(MEGAMORPHIC, nexus.StateFromFeedback());
296 CHECK(!nexus.FindFirstMap());
298 // After a collection, state should not be reset to PREMONOMORPHIC.
299 heap->CollectAllGarbage();
300 CHECK_EQ(MEGAMORPHIC, nexus.StateFromFeedback());
304 TEST(VectorLoadICSlotSharing) {
305 if (i::FLAG_always_opt) return;
306 CcTest::InitializeVM();
307 LocalContext context;
308 v8::HandleScope scope(context->GetIsolate());
309 Isolate* isolate = CcTest::i_isolate();
311 // Function f has 3 LoadICs, one for each o, but the ICs share the same
312 // feedback vector IC slot.
320 Handle<JSFunction> f = v8::Utils::OpenHandle(
321 *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
322 // There should be one IC slot.
323 Handle<TypeFeedbackVector> feedback_vector =
324 Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
325 CHECK_EQ(2, feedback_vector->ICSlots());
326 FeedbackVectorICSlot slot(1);
327 LoadICNexus nexus(feedback_vector, slot);
328 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
332 TEST(VectorLoadICOnSmi) {
333 if (i::FLAG_always_opt) return;
334 CcTest::InitializeVM();
335 LocalContext context;
336 v8::HandleScope scope(context->GetIsolate());
337 Isolate* isolate = CcTest::i_isolate();
338 Heap* heap = isolate->heap();
340 // Make sure function f has a call that uses a type feedback slot.
342 "var o = { foo: 3 };"
343 "function f(a) { return a.foo; } f(o);");
344 Handle<JSFunction> f = v8::Utils::OpenHandle(
345 *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
346 // There should be one IC.
347 Handle<TypeFeedbackVector> feedback_vector =
348 Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
349 FeedbackVectorICSlot slot(1);
350 LoadICNexus nexus(feedback_vector, slot);
351 CHECK_EQ(PREMONOMORPHIC, nexus.StateFromFeedback());
354 CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
355 // Verify that the monomorphic map is the one we expect.
356 Map* number_map = heap->heap_number_map();
357 CHECK_EQ(number_map, nexus.FindFirstMap());
359 // Now go polymorphic on o.
361 CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
364 nexus.FindAllMaps(&maps);
365 CHECK_EQ(2, maps.length());
367 // One of the maps should be the o map.
368 Handle<JSObject> o = v8::Utils::OpenHandle(
369 *v8::Handle<v8::Object>::Cast(CcTest::global()->Get(v8_str("o"))));
370 bool number_map_found = false;
371 bool o_map_found = false;
372 for (int i = 0; i < maps.length(); i++) {
373 Handle<Map> current = maps[i];
374 if (*current == number_map)
375 number_map_found = true;
376 else if (*current == o->map())
379 CHECK(number_map_found && o_map_found);
381 // The degree of polymorphism doesn't change.
382 CompileRun("f(100)");
383 CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
385 nexus.FindAllMaps(&maps2);
386 CHECK_EQ(2, maps2.length());