[compiler] Introduce initial StrictEqualStub.

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 <map>
 
 // 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/heap/heap.h"
 #include "src/machine-type.h"
 #include "src/runtime/runtime.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class Isolate;
+class Factory;
 class Zone;
 
 namespace compiler {
 
 class CallDescriptor;
 class Graph;
 class Node;
 class Operator;
 class RawMachineAssembler;
 class RawMachineLabel;
@@ skipping 33 matching lines @@
   V(Word64Or)                                 \
   V(Word64And)                                \
   V(Word64Xor)                                \
   V(Word64Shr)                                \
   V(Word64Sar)                                \
   V(Word64Ror)                                \
   V(UintPtrGreaterThanOrEqual)
 
 #define CODE_STUB_ASSEMBLER_UNARY_OP_LIST(V) \
   V(ChangeFloat64ToUint32)                   \
+  V(ChangeInt32ToFloat64)                    \
   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,
@@ skipping 30 matching lines @@
 
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* SmiConstant(Smi* value);
   Node* HeapConstant(Handle<HeapObject> object);
   Node* BooleanConstant(bool value);
   Node* ExternalConstant(ExternalReference address);
   Node* Float64Constant(double value);
+  Node* HeapNumberMapConstant();
 
   Node* Parameter(int value);
   void Return(Node* value);
 
   void Bind(Label* label);
   void Goto(Label* label);
   void Branch(Node* condition, Label* true_label, Label* false_label);
 
   void Switch(Node* index, Label* default_label, int32_t* case_values,
               Label** case_labels, size_t case_count);
@@ skipping 60 matching lines @@
   Node* CallStub(const CallInterfaceDescriptor& descriptor, Node* target,
                  Node* context, Node* arg1, Node* arg2, Node* arg3,
                  size_t result_size = 1);
   Node* CallStub(const CallInterfaceDescriptor& descriptor, Node* target,
                  Node* context, Node* arg1, Node* arg2, Node* arg3, Node* arg4,
                  size_t result_size = 1);
   Node* CallStub(const CallInterfaceDescriptor& descriptor, Node* target,
                  Node* context, Node* arg1, Node* arg2, Node* arg3, Node* arg4,
                  Node* arg5, size_t result_size = 1);
 
-  Node* TailCallStub(CodeStub& stub, Node** args);
+  Node* TailCallStub(const CallInterfaceDescriptor& descriptor, Node* target,
+                     Node* context, Node* arg1, Node* arg2,
+                     size_t result_size = 1);
+
   Node* TailCall(const CallInterfaceDescriptor& descriptor, Node* target,
                  Node** args, size_t result_size = 1);
 
   // ===========================================================================
   // Macros
   // ===========================================================================
 
   // 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.
+
+  // Smi conversions.
+  Node* SmiToFloat64(Node* value);
   Node* SmiToInt32(Node* value);
 
   // Smi operations.
   Node* SmiAdd(Node* a, Node* b);
   Node* SmiEqual(Node* a, Node* b);
 
   // Load a value from the root array.
   Node* LoadRoot(Heap::RootListIndex root_index);
 
   // Check a value for smi-ness
   Node* WordIsSmi(Node* a);
 
   // Load an object pointer from a buffer that isn't in the heap.
   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.
+  // Load the floating point value of a HeapNumber.
   Node* LoadHeapNumberValue(Node* object);
+  // Load the instance type of a Map.
+  Node* LoadMapInstanceType(Node* map);
 
   // Load an array element from a FixedArray.
   Node* LoadFixedArrayElementSmiIndex(Node* object, Node* smi_index,
                                       int additional_offset = 0);
   Node* LoadFixedArrayElementConstantIndex(Node* object, int index);
 
   // 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);
 
+  // Branching helpers.
+  // TODO(danno): Can we be more cleverish wrt. edge-split?
+  void BranchIfFloat64Equal(Node* a, Node* b, Label* if_true, Label* if_false);
+  void BranchIfFloat64IsNaN(Node* value, Label* if_true, Label* if_false) {
+    BranchIfFloat64Equal(value, value, if_false, if_true);
+  }
+
  protected:
   // Protected helpers which delegate to RawMachineAssembler.
-  Graph* graph();
-  Isolate* isolate();
-  Zone* zone();
+  Graph* graph() const;
+  Factory* factory() const;
+  Isolate* isolate() const;
+  Zone* zone() const;
 
   // Enables subclasses to perform operations before and after a call.
   virtual void CallPrologue();
   virtual void CallEpilogue();
 
  private:
   friend class CodeStubAssemblerTester;
 
   Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
   Node* TailCallN(CallDescriptor* descriptor, Node* code_target, Node** args);
@@ skipping 34 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_