[Atomics] code stubs for atomic operations

src/compiler/code-stub-assembler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 #define V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 
+#include <limits>
+#include <vector>
+
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
 #include "src/builtins.h"
+#include "src/machine-type.h"
 #include "src/runtime/runtime.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class Isolate;
 class Zone;
 
 namespace compiler {
 
 class CallDescriptor;
 class Graph;
 class Node;
 class Operator;
 class RawMachineAssembler;
+class RawMachineLabel;
 class Schedule;
 
 class CodeStubAssembler {
  public:
+  class Label;
+
+  // Create with CallStub linkage.
   CodeStubAssembler(Isolate* isolate, Zone* zone,
                     const CallInterfaceDescriptor& descriptor,
                     Code::Flags flags, const char* name);
+
+  // Create with JSCall linkage.
+  CodeStubAssembler(Isolate* isolate, Zone* zone, int parameter_count,
+                    Code::Flags flags, const char* name);
+
   virtual ~CodeStubAssembler();
 
   Handle<Code> GenerateCode();
 
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* HeapConstant(Handle<HeapObject> object);
+  Node* UndefinedConstant();
   Node* BooleanConstant(bool value);
 
+  // Memory Operations.
+  Node* Load(MachineType rep, Node* base);
+  Node* Load(MachineType rep, Node* base, Node* index);
+
   Node* Parameter(int value);
-  void Return(Node* value);
 
   // Tag and untag Smi values.
   Node* SmiTag(Node* value);
   Node* SmiUntag(Node* value);
 
   // Basic arithmetic operations.
   Node* IntPtrAdd(Node* a, Node* b);
   Node* IntPtrSub(Node* a, Node* b);
   Node* WordShl(Node* value, int shift);
+  Node* WordEqual(Node* a, Node* b);
+  Node* WordOr(Node* a, Node* b);
+  Node* WordAnd(Node* a, Node* b);
+  Node* Int32GreaterThanOrEqual(Node* a, Node* b);
+  Node* Int32LessThan(Node* a, Node* b);
 
-  // Load a field from an object on the heap.
+  // Heap objects.
   Node* LoadObjectField(Node* object, int offset);
+  Node* IsHeapObject(Node* tagged);
+  Node* InstanceType(Node* object);
+
+  // Returns a node that is true if the given bit is set in |word32|.
+  template <typename T>
+  Node* BitFieldValue(Node* word32) {
+    return BitFieldValue(word32, T::kShift, T::kMask);
+  }
+
+  Node* BitFieldValue(Node* word32, uint32_t shift, uint32_t mask);
 
   // Call runtime function.
-  Node* CallRuntime(Runtime::FunctionId function_id, Node* context, Node* arg1);
-  Node* CallRuntime(Runtime::FunctionId function_id, Node* context, Node* arg1,
-                    Node* arg2);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2);
 
-  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
-                        Node* arg1);
-  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
-                        Node* arg1, Node* arg2);
+  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* arg1);
+  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* arg1,
+                        Node* arg2);
+
+  // Control flow.
+  void Goto(Label* label);
+  void Branch(Node* cond, Label* true_label, Label* false_label);
+  void Bind(Label* label);
+  void Return(Node* value);
+
+  // Variables.
+  Node* Phi(MachineRepresentation rep, Node* n1, Node* n2);
 
  private:
   friend class CodeStubAssemblerTester;
 
+  Node* Context();
   Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
   Node* TailCallN(CallDescriptor* descriptor, Node* code_target, Node** args);
 
   Node* SmiShiftBitsConstant();
+  RawMachineLabel* GetOrCreateRawMachineLabel(Label* label);
 
   // Private helpers which delegate to RawMachineAssembler.
   Graph* graph();
   Isolate* isolate();
   Zone* zone();
 
+  enum class LinkageDescriptorType { kStubCall, kJSCall };
+
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   Code::Flags flags_;
   const char* name_;
   bool code_generated_;
+  std::vector<RawMachineLabel*> labels_;
+  LinkageDescriptorType linkage_type_;
+  int parameter_count_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeStubAssembler);
 };
 
+
+class CodeStubAssembler::Label {
+ public:
+  Label() : raw_label_(nullptr) {}
+
+ private:
+  friend class CodeStubAssembler;
+
+  RawMachineLabel* raw_label_;

[Jarin, 2016/02/08 10:25:04]

Why is this a pointer? Can't it be an embedded field?

+};
+
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_