Create a new paged heap space for global property cells. The new...

src/objects.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 805 matching lines @@
   static const int kMinValue = -(1 << (kSmiNumBits - 1));
   static const int kMaxValue = (1 << (kSmiNumBits - 1)) - 1;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Smi);
 };
 
 
 // Failure is used for reporting out of memory situations and
 // propagating exceptions through the runtime system.  Failure objects
-// are transient and cannot occur as part of the objects graph.
+// are transient and cannot occur as part of the object graph.
 //
 // Failures are a single word, encoded as follows:
 // +-------------------------+---+--+--+
 // |rrrrrrrrrrrrrrrrrrrrrrrrr|sss|tt|11|
 // +-------------------------+---+--+--+
+//  3                       7 6 4 32 10
+//  1
 //
 // The low two bits, 0-1, are the failure tag, 11.  The next two bits,
 // 2-3, are a failure type tag 'tt' with possible values:
 //   00 RETRY_AFTER_GC
 //   01 EXCEPTION
 //   10 INTERNAL_ERROR
 //   11 OUT_OF_MEMORY_EXCEPTION
 //
 // The next three bits, 4-6, are an allocation space tag 'sss'.  The
 // allocation space tag is 000 for all failure types except
-// RETRY_AFTER_GC.  For RETRY_AFTER_GC, the possible values are
-// (the encoding is found in globals.h):
-//   000 NEW_SPACE
-//   001 OLD_SPACE
-//   010 CODE_SPACE
-//   011 MAP_SPACE
-//   100 LO_SPACE
+// RETRY_AFTER_GC.  For RETRY_AFTER_GC, the possible values are the
+// allocation spaces (the encoding is found in globals.h).
 //
-// The remaining bits is the number of words requested by the
-// allocation request that failed, and is zeroed except for
-// RETRY_AFTER_GC failures.  The 25 bits (on a 32 bit platform) gives
-// a representable range of 2^27 bytes (128MB).
+// The remaining bits is the size of the allocation request in units
+// of the pointer size, and is zeroed except for RETRY_AFTER_GC
+// failures.  The 25 bits (on a 32 bit platform) gives a representable
+// range of 2^27 bytes (128MB).
 
 // Failure type tag info.
 const int kFailureTypeTagSize = 2;
 const int kFailureTypeTagMask = (1 << kFailureTypeTagSize) - 1;
 
 class Failure: public Object {
  public:
   // RuntimeStubs assumes EXCEPTION = 1 in the compiler-generated code.
   enum Type {
     RETRY_AFTER_GC = 0,
@@ skipping 109 matching lines @@
 
   // During serialization: the map word is used to hold an encoded
   // address, and possibly a mark bit (set and cleared with SetMark
   // and ClearMark).
 
   // Create a map word from an encoded address.
   static inline MapWord FromEncodedAddress(Address address);
 
   inline Address ToEncodedAddress();
 
- private:
-  // HeapObject calls the private constructor and directly reads the value.
-  friend class HeapObject;
-
-  explicit MapWord(uintptr_t value) : value_(value) {}
-
-  uintptr_t value_;
-
   // Bits used by the marking phase of the garbage collector.
   //
   // The first word of a heap object is normally a map pointer. The last two
   // bits are tagged as '01' (kHeapObjectTag). We reuse the last two bits to
   // mark an object as live and/or overflowed:
   //   last bit = 0, marked as alive
   //   second bit = 1, overflowed
   // An object is only marked as overflowed when it is marked as live while
   // the marking stack is overflowed.
   static const int kMarkingBit = 0;  // marking bit
@@ skipping 21 matching lines @@
   static const uint32_t kMapPageIndexMask =
       (1 << kMapPageOffsetShift) - 1;
 
   // 0x001FFC00
   static const uint32_t kMapPageOffsetMask =
       ((1 << kForwardingOffsetShift) - 1) & ~kMapPageIndexMask;
 
   // 0xFFE00000
   static const uint32_t kForwardingOffsetMask =
       ~(kMapPageIndexMask | kMapPageOffsetMask);
+
+ private:
+  // HeapObject calls the private constructor and directly reads the value.
+  friend class HeapObject;
+
+  explicit MapWord(uintptr_t value) : value_(value) {}
+
+  uintptr_t value_;
 };
 
 
 // HeapObject is the superclass for all classes describing heap allocated
 // objects.
 class HeapObject: public Object {
  public:
   // [map]: Contains a map which contains the object's reflective
   // information.
   inline Map* map();
@@ skipping 3579 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_