Reland of [heap] Simplify marking of JSFunction and SFI

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7525 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Iterator);
   };
 
   DECLARE_CAST(SharedFunctionInfo)
 
   // Constants.
   static const int kDontAdaptArgumentsSentinel = -1;
 
   // Layout description.
   // Pointer fields.
-  static const int kNameOffset = HeapObject::kHeaderSize;
-  static const int kCodeOffset = kNameOffset + kPointerSize;
-  static const int kOptimizedCodeMapOffset = kCodeOffset + kPointerSize;
+  static const int kCodeOffset = HeapObject::kHeaderSize;
+  static const int kNameOffset = kCodeOffset + kPointerSize;
+  static const int kOptimizedCodeMapOffset = kNameOffset + kPointerSize;
   static const int kScopeInfoOffset = kOptimizedCodeMapOffset + kPointerSize;
   static const int kOuterScopeInfoOffset = kScopeInfoOffset + kPointerSize;
   static const int kConstructStubOffset = kOuterScopeInfoOffset + kPointerSize;
   static const int kInstanceClassNameOffset =
       kConstructStubOffset + kPointerSize;
   static const int kFunctionDataOffset =
       kInstanceClassNameOffset + kPointerSize;
   static const int kScriptOffset = kFunctionDataOffset + kPointerSize;
   static const int kDebugInfoOffset = kScriptOffset + kPointerSize;
   static const int kFunctionIdentifierOffset = kDebugInfoOffset + kPointerSize;
@@ skipping 104 matching lines @@
   static const int kSize = kAstNodeCountOffset + kIntSize;
 
 #else
 #error Unknown byte ordering
 #endif  // Big endian
 #endif  // 64-bit
 
 
   static const int kAlignedSize = POINTER_SIZE_ALIGN(kSize);
 
+  typedef FixedBodyDescriptor<kCodeOffset,
+                              kLastPointerFieldOffset + kPointerSize, kSize>
+      BodyDescriptor;
   typedef FixedBodyDescriptor<kNameOffset,
-                              kLastPointerFieldOffset + kPointerSize,
-                              kSize> BodyDescriptor;
+                              kLastPointerFieldOffset + kPointerSize, kSize>
+      BodyDescriptorWeakCode;
 
   // Bit positions in start_position_and_type.
   // The source code start position is in the 30 most significant bits of
   // the start_position_and_type field.
   static const int kIsNamedExpressionBit = 0;
   static const int kIsTopLevelBit = 1;
   static const int kStartPositionShift = 2;
   static const int kStartPositionMask = ~((1 << kStartPositionShift) - 1);
 
   // Bit positions in compiler_hints.
@@ skipping 3751 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_