CodeStubAssembler can generate code for builtins

src/compiler/code-stub-assembler.h

Index: src/compiler/code-stub-assembler.h
diff --git a/src/compiler/code-stub-assembler.h b/src/compiler/code-stub-assembler.h
index 115bc43dbc99a8e2f88204c6f3d8a873f27f846a..a12414b3d9f42e82f7100962e87b940b3dc6ed34 100644
--- a/src/compiler/code-stub-assembler.h
+++ b/src/compiler/code-stub-assembler.h
@@ -43,6 +43,7 @@ class Schedule;
   V(Int32Sub)                                 \
   V(Int32Mul)                                 \
   V(Int32GreaterThanOrEqual)                  \
+  V(Int32LessThan)                            \
   V(WordEqual)                                \
   V(WordNotEqual)                             \
   V(WordOr)                                   \
@@ -71,14 +72,26 @@ class Schedule;
   V(Word64Ror)                                \
   V(UintPtrGreaterThanOrEqual)
 
+#define CODE_STUB_ASSEMBLER_UNARY_OP_LIST(V) \
+  V(ChangeFloat64ToUint32)                   \
+  V(ChangeInt32ToInt64)                      \
+  V(ChangeUint32ToFloat64)                   \
+  V(ChangeUint32ToUint64)
+
 class CodeStubAssembler {
  public:
+  // Create with CallStub linkage.
   // |result_size| specifies the number of results returned by the stub.
   // TODO(rmcilroy): move result_size to the CallInterfaceDescriptor.
   CodeStubAssembler(Isolate* isolate, Zone* zone,
                     const CallInterfaceDescriptor& descriptor,
                     Code::Flags flags, const char* name,
                     size_t result_size = 1);
+
+  // Create with JSCall linkage.
+  CodeStubAssembler(Isolate* isolate, Zone* zone, int parameter_count,
+                    Code::Flags flags, const char* name);
+
   virtual ~CodeStubAssembler();
 
   Handle<Code> GenerateCode();
@@ -147,9 +160,10 @@ class CodeStubAssembler {
 
   Node* WordShl(Node* value, int shift);
 
-  // Conversions
-  Node* ChangeInt32ToInt64(Node* value);
-  Node* ChangeUint32ToUint64(Node* value);
+// Unary
+#define DECLARE_CODE_STUB_ASSEMBER_UNARY_OP(name) Node* name(Node* a);
+  CODE_STUB_ASSEMBLER_UNARY_OP_LIST(DECLARE_CODE_STUB_ASSEMBER_UNARY_OP)
+#undef DECLARE_CODE_STUB_ASSEMBER_UNARY_OP
 
   // Projections
   Node* Projection(int index, Node* value);
@@ -166,6 +180,7 @@ class CodeStubAssembler {
   Node* CallRuntime(Runtime::FunctionId function_id, Node* context, Node* arg1,
                     Node* arg2, Node* arg3, Node* arg4, Node* arg5);
 
+  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context);
   Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
                         Node* arg1);
   Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
@@ -197,9 +212,12 @@ class CodeStubAssembler {
   // Macros
   // ===========================================================================
 
-  // Tag and untag Smi values.
+  // Tag a Word as a Smi value.
   Node* SmiTag(Node* value);
+  // Untag a Smi value as a Word.
   Node* SmiUntag(Node* value);
+  // Untag an Smi value as a 32-bit value.
+  Node* SmiToInt32(Node* value);
 
   // Smi operations.
   Node* SmiAdd(Node* a, Node* b);
@@ -215,6 +233,8 @@ class CodeStubAssembler {
   Node* LoadBufferObject(Node* buffer, int offset);
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset);
+  // Load the HeapNumber value from a HeapNumber object.
+  Node* LoadHeapNumberValue(Node* object);
 
   // Load an array element from a FixedArray.
   Node* LoadFixedArrayElementSmiIndex(Node* object, Node* smi_index,
@@ -224,6 +244,15 @@ class CodeStubAssembler {
   // Store an array element to a FixedArray.
   Node* StoreFixedArrayElementNoWriteBarrier(Node* object, Node* index,
                                              Node* value);
+  Node* LoadInstanceType(Node* object);
+
+  // Returns a node that is true if the given bit is set in |word32|.
+  template <typename T>
+  Node* BitFieldDecode(Node* word32) {
+    return BitFieldDecode(word32, T::kShift, T::kMask);
+  }
+
+  Node* BitFieldDecode(Node* word32, uint32_t shift, uint32_t mask);
 
  protected:
   // Protected helpers which delegate to RawMachineAssembler.