1 // Copyright 2016 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. 4 5 #include "src/code-stub-assembler.h" 6 7 namespace v8 { 8 namespace internal { 9 10 typedef compiler::Node Node; 11 typedef compiler::CodeAssemblerState CodeAssemblerState; 12 typedef compiler::CodeAssemblerLabel CodeAssemblerLabel; 13 14 class ConstructorBuiltinsAssembler : public CodeStubAssembler { 15 public: 16 explicit ConstructorBuiltinsAssembler(CodeAssemblerState* state) 17 : CodeStubAssembler(state) {} 18 19 Node* EmitFastNewClosure(Node* shared_info, Node* feedback_vector, Node* slot, 20 Node* context); 21 Node* EmitFastNewFunctionContext(Node* closure, Node* slots, Node* context, 22 ScopeType scope_type); 23 static int MaximumFunctionContextSlots(); 24 25 Node* EmitFastCloneRegExp(Node* closure, Node* literal_index, Node* pattern, 26 Node* flags, Node* context); 27 Node* EmitFastCloneShallowArray(Node* closure, Node* literal_index, 28 Node* context, 29 CodeAssemblerLabel* call_runtime, 30 AllocationSiteMode allocation_site_mode); 31 32 // Maximum number of elements in copied array (chosen so that even an array 33 // backed by a double backing store will fit into new-space). 34 static const int kMaximumClonedShallowArrayElements = 35 JSArray::kInitialMaxFastElementArray * kPointerSize / kDoubleSize; 36 37 void CreateFastCloneShallowArrayBuiltin( 38 AllocationSiteMode allocation_site_mode); 39 40 // Maximum number of properties in copied objects. 41 static const int kMaximumClonedShallowObjectProperties = 6; 42 static int FastCloneShallowObjectPropertiesCount(int literal_length); 43 Node* EmitFastCloneShallowObject(CodeAssemblerLabel* call_runtime, 44 Node* closure, Node* literals_index, 45 Node* properties_count); 46 void CreateFastCloneShallowObjectBuiltin(int properties_count); 47 48 Node* EmitFastNewObject(Node* context, Node* target, Node* new_target); 49 50 Node* EmitFastNewObject(Node* context, Node* target, Node* new_target, 51 CodeAssemblerLabel* call_runtime); 52 53 private: 54 static const int kMaximumSlots = 0x8000; 55 static const int kSmallMaximumSlots = 10; 56 57 Node* NonEmptyShallowClone(Node* boilerplate, Node* boilerplate_map, 58 Node* boilerplate_elements, Node* allocation_site, 59 Node* capacity, ElementsKind kind); 60 61 // FastNewFunctionContext can only allocate closures which fit in the 62 // new space. 63 STATIC_ASSERT(((kMaximumSlots + Context::MIN_CONTEXT_SLOTS) * kPointerSize + 64 FixedArray::kHeaderSize) < kMaxRegularHeapObjectSize); 65 }; 66 67 } // namespace internal 68 } // namespace v8 69
