[TypeFeedbackVector] Root feedback vectors at function literal site.

src/contexts.cc

 // Copyright 2011 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/contexts.h"
 
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
 
@@ skipping 394 matching lines @@
   } while (follow_context_chain);
 
   if (FLAG_trace_contexts) {
     PrintF("=> no property/slot found\n");
   }
   return Handle<Object>::null();
 }
 
 static const int kSharedOffset = 0;
 static const int kCachedCodeOffset = 1;
-static const int kFeedbackVectorOffset = 2;
-static const int kOsrAstIdOffset = 3;
-static const int kEntryLength = 4;
+static const int kOsrAstIdOffset = 2;
+static const int kEntryLength = 3;
 static const int kInitialLength = kEntryLength;
 
 int Context::SearchOptimizedCodeMapEntry(SharedFunctionInfo* shared,
                                          BailoutId osr_ast_id) {
   DisallowHeapAllocation no_gc;
   DCHECK(this->IsNativeContext());
   if (!OptimizedCodeMapIsCleared()) {
     FixedArray* optimized_code_map = this->osr_code_table();
     int length = optimized_code_map->length();
     Smi* osr_ast_id_smi = Smi::FromInt(osr_ast_id.ToInt());
     for (int i = 0; i < length; i += kEntryLength) {
       if (WeakCell::cast(optimized_code_map->get(i + kSharedOffset))->value() ==
               shared &&
           optimized_code_map->get(i + kOsrAstIdOffset) == osr_ast_id_smi) {
         return i;
       }
     }
   }
   return -1;
 }
 
-void Context::SearchOptimizedCodeMap(SharedFunctionInfo* shared,
-                                     BailoutId osr_ast_id, Code** pcode,
-                                     TypeFeedbackVector** pvector) {
+Code* Context::SearchOptimizedCodeMap(SharedFunctionInfo* shared,
+                                      BailoutId osr_ast_id) {
   DCHECK(this->IsNativeContext());
   int entry = SearchOptimizedCodeMapEntry(shared, osr_ast_id);
   if (entry != -1) {
     FixedArray* code_map = osr_code_table();
     DCHECK_LE(entry + kEntryLength, code_map->length());
     WeakCell* cell = WeakCell::cast(code_map->get(entry + kCachedCodeOffset));
-    WeakCell* vector_cell =
-        WeakCell::cast(code_map->get(entry + kFeedbackVectorOffset));
-
-    *pcode = cell->cleared() ? nullptr : Code::cast(cell->value());
-    *pvector = vector_cell->cleared()
-                   ? nullptr
-                   : TypeFeedbackVector::cast(vector_cell->value());
-  } else {
-    *pcode = nullptr;
-    *pvector = nullptr;
+    return cell->cleared() ? nullptr : Code::cast(cell->value());
   }
+  return nullptr;
 }
 
 void Context::AddToOptimizedCodeMap(Handle<Context> native_context,
                                     Handle<SharedFunctionInfo> shared,
                                     Handle<Code> code,
-                                    Handle<TypeFeedbackVector> vector,
                                     BailoutId osr_ast_id) {
   DCHECK(native_context->IsNativeContext());
   Isolate* isolate = native_context->GetIsolate();
   if (isolate->serializer_enabled()) return;
 
-  STATIC_ASSERT(kEntryLength == 4);
+  STATIC_ASSERT(kEntryLength == 3);
   Handle<FixedArray> new_code_map;
   int entry;
 
   if (native_context->OptimizedCodeMapIsCleared()) {
     new_code_map = isolate->factory()->NewFixedArray(kInitialLength, TENURED);
     entry = 0;
   } else {
     Handle<FixedArray> old_code_map(native_context->osr_code_table(), isolate);
     entry = native_context->SearchOptimizedCodeMapEntry(*shared, osr_ast_id);
     if (entry >= 0) {
-      // Just set the code and literals of the entry.
+      // Just set the code of the entry.
       Handle<WeakCell> code_cell = isolate->factory()->NewWeakCell(code);
       old_code_map->set(entry + kCachedCodeOffset, *code_cell);
-      Handle<WeakCell> vector_cell = isolate->factory()->NewWeakCell(vector);
-      old_code_map->set(entry + kFeedbackVectorOffset, *vector_cell);
       return;
     }
 
     // Can we reuse an entry?
     DCHECK(entry < 0);
     int length = old_code_map->length();
     for (int i = 0; i < length; i += kEntryLength) {
       if (WeakCell::cast(old_code_map->get(i + kSharedOffset))->cleared()) {
         new_code_map = old_code_map;
         entry = i;
         break;
       }
     }
 
     if (entry < 0) {
       // Copy old optimized code map and append one new entry.
       new_code_map = isolate->factory()->CopyFixedArrayAndGrow(
           old_code_map, kEntryLength, TENURED);
       entry = old_code_map->length();
     }
   }
 
   Handle<WeakCell> code_cell = isolate->factory()->NewWeakCell(code);
-  Handle<WeakCell> vector_cell = isolate->factory()->NewWeakCell(vector);
   Handle<WeakCell> shared_cell = isolate->factory()->NewWeakCell(shared);
 
   new_code_map->set(entry + kSharedOffset, *shared_cell);
   new_code_map->set(entry + kCachedCodeOffset, *code_cell);
-  new_code_map->set(entry + kFeedbackVectorOffset, *vector_cell);
   new_code_map->set(entry + kOsrAstIdOffset, Smi::FromInt(osr_ast_id.ToInt()));
 
 #ifdef DEBUG
   for (int i = 0; i < new_code_map->length(); i += kEntryLength) {
     WeakCell* cell = WeakCell::cast(new_code_map->get(i + kSharedOffset));
     DCHECK(cell->cleared() || cell->value()->IsSharedFunctionInfo());
     cell = WeakCell::cast(new_code_map->get(i + kCachedCodeOffset));
     DCHECK(cell->cleared() ||
            (cell->value()->IsCode() &&
             Code::cast(cell->value())->kind() == Code::OPTIMIZED_FUNCTION));
-    cell = WeakCell::cast(new_code_map->get(i + kFeedbackVectorOffset));
-    DCHECK(cell->cleared() || cell->value()->IsFixedArray());
     DCHECK(new_code_map->get(i + kOsrAstIdOffset)->IsSmi());
   }
 #endif
 
   FixedArray* old_code_map = native_context->osr_code_table();
   if (old_code_map != *new_code_map) {
     native_context->set_osr_code_table(*new_code_map);
   }
 }
 
@@ skipping 20 matching lines @@
         PrintF(" (osr ast id %d)]\n", osr.ToInt());
       }
       // Evict the src entry by not copying it to the dst entry.
       continue;
     }
     // Keep the src entry by copying it to the dst entry.
     if (dst != src) {
       code_map->set(dst + kSharedOffset, code_map->get(src + kSharedOffset));
       code_map->set(dst + kCachedCodeOffset,
                     code_map->get(src + kCachedCodeOffset));
-      code_map->set(dst + kFeedbackVectorOffset,
-                    code_map->get(src + kFeedbackVectorOffset));
       code_map->set(dst + kOsrAstIdOffset,
                     code_map->get(src + kOsrAstIdOffset));
     }
     dst += kEntryLength;
   }
   if (dst != length) {
     // Always trim even when array is cleared because of heap verifier.
     heap->RightTrimFixedArray(code_map, length - dst);
     if (code_map->length() == 0) {
       ClearOptimizedCodeMap();
@@ skipping 190 matching lines @@
 
   int previous_value = errors_thrown()->value();
   set_errors_thrown(Smi::FromInt(previous_value + 1));
 }
 
 
 int Context::GetErrorsThrown() { return errors_thrown()->value(); }
 
 }  // namespace internal
 }  // namespace v8