Add visibility attributes in runtime/gc/space

Bug: 260881207
Test: presubmit
Test: abtd app_compat_drm
Test: abtd app_compat_top_100
Test: abtd app_compat_banking
Change-Id: I30e2cc4d0da339711dbbba26f5d140be84b4121a

35 files changed, 55 insertions, 55 deletions

diff --git a/runtime/gc/space/bump_pointer_space-inl.h b/runtime/gc/space/bump_pointer_space-inl.h
index 2774b9e71c..6751344bc4 100644
--- a/runtime/gc/space/bump_pointer_space-inl.h
+++ b/runtime/gc/space/bump_pointer_space-inl.h
@@ -22,7 +22,7 @@
 #include "base/bit_utils.h"
 #include "mirror/object-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/bump_pointer_space-walk-inl.h b/runtime/gc/space/bump_pointer_space-walk-inl.h
index 89e42bcf27..86af0451de 100644
--- a/runtime/gc/space/bump_pointer_space-walk-inl.h
+++ b/runtime/gc/space/bump_pointer_space-walk-inl.h
@@ -25,7 +25,7 @@
 
 #include <memory>
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/bump_pointer_space.cc b/runtime/gc/space/bump_pointer_space.cc
index aa85ba1247..17e08357e8 100644
--- a/runtime/gc/space/bump_pointer_space.cc
+++ b/runtime/gc/space/bump_pointer_space.cc
@@ -20,7 +20,7 @@
 #include "mirror/object-inl.h"
 #include "thread_list.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/bump_pointer_space.h b/runtime/gc/space/bump_pointer_space.h
index d5ab5069ec..77beb476e6 100644
--- a/runtime/gc/space/bump_pointer_space.h
+++ b/runtime/gc/space/bump_pointer_space.h
@@ -22,7 +22,7 @@
 
 #include <deque>
 
-namespace art {
+namespace art HIDDEN {
 
 namespace mirror {
 class Object;
@@ -39,7 +39,7 @@ namespace space {
 
 // A bump pointer space allocates by incrementing a pointer, it doesn't provide a free
 // implementation as its intended to be evacuated.
-class BumpPointerSpace final : public ContinuousMemMapAllocSpace {
+class EXPORT BumpPointerSpace final : public ContinuousMemMapAllocSpace {
  public:
   using WalkCallback = void (*)(void *, void *, int, void *);
 
diff --git a/runtime/gc/space/dlmalloc_space-inl.h b/runtime/gc/space/dlmalloc_space-inl.h
index 6041fd02af..0d9467314b 100644
--- a/runtime/gc/space/dlmalloc_space-inl.h
+++ b/runtime/gc/space/dlmalloc_space-inl.h
@@ -21,7 +21,7 @@
 #include "gc/allocator/art-dlmalloc.h"
 #include "thread.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/dlmalloc_space.cc b/runtime/gc/space/dlmalloc_space.cc
index dda390faca..b45e4824ed 100644
--- a/runtime/gc/space/dlmalloc_space.cc
+++ b/runtime/gc/space/dlmalloc_space.cc
@@ -34,7 +34,7 @@
 #include "thread.h"
 #include "thread_list.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/dlmalloc_space.h b/runtime/gc/space/dlmalloc_space.h
index 82b3cc0b32..774d2e3c80 100644
--- a/runtime/gc/space/dlmalloc_space.h
+++ b/runtime/gc/space/dlmalloc_space.h
@@ -20,7 +20,7 @@
 #include "malloc_space.h"
 #include "space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 
 namespace collector {
diff --git a/runtime/gc/space/dlmalloc_space_random_test.cc b/runtime/gc/space/dlmalloc_space_random_test.cc
index b653bcf03a..bcca442fb8 100644
--- a/runtime/gc/space/dlmalloc_space_random_test.cc
+++ b/runtime/gc/space/dlmalloc_space_random_test.cc
@@ -18,7 +18,7 @@
 
 #include "dlmalloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 namespace {
diff --git a/runtime/gc/space/dlmalloc_space_static_test.cc b/runtime/gc/space/dlmalloc_space_static_test.cc
index 74dd765dfd..c07a8eaa8b 100644
--- a/runtime/gc/space/dlmalloc_space_static_test.cc
+++ b/runtime/gc/space/dlmalloc_space_static_test.cc
@@ -18,7 +18,7 @@
 
 #include "dlmalloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 namespace {
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 7d0bb1b674..3314c14fca 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -69,7 +69,7 @@
 #include "runtime.h"
 #include "space-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/image_space.h b/runtime/gc/space/image_space.h
index 5271489fc6..63a47c86c1 100644
--- a/runtime/gc/space/image_space.h
+++ b/runtime/gc/space/image_space.h
@@ -24,7 +24,7 @@
 #include "runtime.h"
 #include "space.h"
 
-namespace art {
+namespace art HIDDEN {
 
 class DexFile;
 enum class InstructionSet;
@@ -152,9 +152,9 @@ class ImageSpace : public MemMapSpace {
 
   // Try to open an existing app image space for an oat file,
   // using the boot image spaces from the current Runtime.
-  static std::unique_ptr<ImageSpace> CreateFromAppImage(const char* image,
-                                                        const OatFile* oat_file,
-                                                        std::string* error_msg)
+  EXPORT static std::unique_ptr<ImageSpace> CreateFromAppImage(const char* image,
+                                                               const OatFile* oat_file,
+                                                               std::string* error_msg)
       REQUIRES_SHARED(Locks::mutator_lock_);
   // Try to open an existing app image space for an the oat file and given boot image spaces.
   static std::unique_ptr<ImageSpace> CreateFromAppImage(
@@ -167,7 +167,7 @@ class ImageSpace : public MemMapSpace {
   static bool IsBootClassPathOnDisk(InstructionSet image_isa);
 
   // Give access to the OatFile.
-  const OatFile* GetOatFile() const;
+  EXPORT const OatFile* GetOatFile() const;
 
   // Releases the OatFile from the ImageSpace so it can be transfer to
   // the caller, presumably the OatFileManager.
@@ -238,8 +238,8 @@ class ImageSpace : public MemMapSpace {
   // Returns the checksums for the boot image, extensions and extra boot class path dex files,
   // based on the image spaces and boot class path dex files loaded in memory.
   // The `image_spaces` must correspond to the head of the `boot_class_path`.
-  static std::string GetBootClassPathChecksums(ArrayRef<ImageSpace* const> image_spaces,
-                                               ArrayRef<const DexFile* const> boot_class_path);
+  EXPORT static std::string GetBootClassPathChecksums(
+      ArrayRef<ImageSpace* const> image_spaces, ArrayRef<const DexFile* const> boot_class_path);
 
   // Returns the total number of components (jar files) associated with the image spaces.
   static size_t GetNumberOfComponents(ArrayRef<gc::space::ImageSpace* const> image_spaces);
@@ -255,7 +255,7 @@ class ImageSpace : public MemMapSpace {
       /*out*/std::string* error_msg);
 
   // Expand a single image location to multi-image locations based on the dex locations.
-  static std::vector<std::string> ExpandMultiImageLocations(
+  EXPORT static std::vector<std::string> ExpandMultiImageLocations(
       ArrayRef<const std::string> dex_locations,
       const std::string& image_location,
       bool boot_image_extension = false);
diff --git a/runtime/gc/space/image_space_test.cc b/runtime/gc/space/image_space_test.cc
index 8fb39e849b..e6b758fe55 100644
--- a/runtime/gc/space/image_space_test.cc
+++ b/runtime/gc/space/image_space_test.cc
@@ -28,7 +28,7 @@
 #include "noop_compiler_callbacks.h"
 #include "oat_file.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/large_object_space.cc b/runtime/gc/space/large_object_space.cc
index b0db30b176..3d9fd5a620 100644
--- a/runtime/gc/space/large_object_space.cc
+++ b/runtime/gc/space/large_object_space.cc
@@ -36,7 +36,7 @@
 #include "space-inl.h"
 #include "thread-current-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/large_object_space.h b/runtime/gc/space/large_object_space.h
index 5588f5f7c6..ae1526d818 100644
--- a/runtime/gc/space/large_object_space.h
+++ b/runtime/gc/space/large_object_space.h
@@ -27,7 +27,7 @@
 #include <set>
 #include <vector>
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/large_object_space_test.cc b/runtime/gc/space/large_object_space_test.cc
index 99a67c5812..1d1bc6e683 100644
--- a/runtime/gc/space/large_object_space_test.cc
+++ b/runtime/gc/space/large_object_space_test.cc
@@ -19,7 +19,7 @@
 #include "base/time_utils.h"
 #include "space_test.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/malloc_space.cc b/runtime/gc/space/malloc_space.cc
index b25c4fab38..ca2991a8b8 100644
--- a/runtime/gc/space/malloc_space.cc
+++ b/runtime/gc/space/malloc_space.cc
@@ -35,7 +35,7 @@
 #include "thread.h"
 #include "thread_list.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/malloc_space.h b/runtime/gc/space/malloc_space.h
index 59ab3f3214..73ce4e7436 100644
--- a/runtime/gc/space/malloc_space.h
+++ b/runtime/gc/space/malloc_space.h
@@ -24,7 +24,7 @@
 #include "base/memory_tool.h"
 #include "base/mutex.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 
 namespace collector {
diff --git a/runtime/gc/space/memory_tool_malloc_space-inl.h b/runtime/gc/space/memory_tool_malloc_space-inl.h
index ba088893f7..3fc2b7ab40 100644
--- a/runtime/gc/space/memory_tool_malloc_space-inl.h
+++ b/runtime/gc/space/memory_tool_malloc_space-inl.h
@@ -23,7 +23,7 @@
 #include "memory_tool_settings.h"
 #include "mirror/object-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/memory_tool_malloc_space.h b/runtime/gc/space/memory_tool_malloc_space.h
index ce72b5b435..c76bb9c4ad 100644
--- a/runtime/gc/space/memory_tool_malloc_space.h
+++ b/runtime/gc/space/memory_tool_malloc_space.h
@@ -19,7 +19,7 @@
 
 #include "malloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/memory_tool_settings.h b/runtime/gc/space/memory_tool_settings.h
index e9333c8c97..6fe4f59c34 100644
--- a/runtime/gc/space/memory_tool_settings.h
+++ b/runtime/gc/space/memory_tool_settings.h
@@ -17,7 +17,7 @@
 #ifndef ART_RUNTIME_GC_SPACE_MEMORY_TOOL_SETTINGS_H_
 #define ART_RUNTIME_GC_SPACE_MEMORY_TOOL_SETTINGS_H_
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/region_space-inl.h b/runtime/gc/space/region_space-inl.h
index 4376137cb4..d67fc0ef47 100644
--- a/runtime/gc/space/region_space-inl.h
+++ b/runtime/gc/space/region_space-inl.h
@@ -22,7 +22,7 @@
 #include "region_space.h"
 #include "thread-current-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/region_space.cc b/runtime/gc/space/region_space.cc
index 49ea2d64e6..e891739ec7 100644
--- a/runtime/gc/space/region_space.cc
+++ b/runtime/gc/space/region_space.cc
@@ -24,7 +24,7 @@
 #include "mirror/object-inl.h"
 #include "thread_list.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/region_space.h b/runtime/gc/space/region_space.h
index 98f2060df1..c6b68250fc 100644
--- a/runtime/gc/space/region_space.h
+++ b/runtime/gc/space/region_space.h
@@ -25,7 +25,7 @@
 #include <functional>
 #include <map>
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 
 namespace accounting {
@@ -99,7 +99,7 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!region_lock_) {
     return AllocationSizeNonvirtual(obj, usable_size);
   }
-  size_t AllocationSizeNonvirtual(mirror::Object* obj, size_t* usable_size)
+  EXPORT size_t AllocationSizeNonvirtual(mirror::Object* obj, size_t* usable_size)
       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!region_lock_);
 
   size_t Free(Thread*, mirror::Object*) override {
@@ -117,7 +117,7 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
     return &mark_bitmap_;
   }
 
-  void Clear() override REQUIRES(!region_lock_);
+  EXPORT void Clear() override REQUIRES(!region_lock_);
 
   // Remove read and write memory protection from the whole region space,
   // i.e. make memory pages backing the region area not readable and not
@@ -128,7 +128,7 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
   // pages backing the region area readable and writable. This method is useful
   // to avoid page protection faults when dumping information about an invalid
   // reference.
-  void Unprotect();
+  EXPORT void Unprotect();
 
   // Change the non growth limit capacity to new capacity by shrinking or expanding the map.
   // Currently, only shrinking is supported.
@@ -137,15 +137,15 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
   // growth limit.
   void ClampGrowthLimit(size_t new_capacity) REQUIRES(!region_lock_);
 
-  void Dump(std::ostream& os) const override;
+  EXPORT void Dump(std::ostream& os) const override;
   void DumpRegions(std::ostream& os) REQUIRES(!region_lock_);
   // Dump region containing object `obj`. Precondition: `obj` is in the region space.
   void DumpRegionForObject(std::ostream& os, mirror::Object* obj) REQUIRES(!region_lock_);
-  void DumpNonFreeRegions(std::ostream& os) REQUIRES(!region_lock_);
+  EXPORT void DumpNonFreeRegions(std::ostream& os) REQUIRES(!region_lock_);
 
-  size_t RevokeThreadLocalBuffers(Thread* thread) override REQUIRES(!region_lock_);
+  EXPORT size_t RevokeThreadLocalBuffers(Thread* thread) override REQUIRES(!region_lock_);
   size_t RevokeThreadLocalBuffers(Thread* thread, const bool reuse) REQUIRES(!region_lock_);
-  size_t RevokeAllThreadLocalBuffers() override
+  EXPORT size_t RevokeAllThreadLocalBuffers() override
       REQUIRES(!Locks::runtime_shutdown_lock_, !Locks::thread_list_lock_, !region_lock_);
   void AssertThreadLocalBuffersAreRevoked(Thread* thread) REQUIRES(!region_lock_);
   void AssertAllThreadLocalBuffersAreRevoked()
@@ -227,7 +227,7 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
   accounting::ContinuousSpaceBitmap::SweepCallback* GetSweepCallback() override {
     return nullptr;
   }
-  bool LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) override
+  EXPORT bool LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) override
       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!region_lock_);
 
   // Object alignment within the space.
@@ -453,11 +453,11 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
         REQUIRES(region_space->region_lock_);
 
     // Given a free region, declare it non-free (allocated) and large.
-    void UnfreeLarge(RegionSpace* region_space, uint32_t alloc_time)
+    EXPORT void UnfreeLarge(RegionSpace* region_space, uint32_t alloc_time)
         REQUIRES(region_space->region_lock_);
 
     // Given a free region, declare it non-free (allocated) and large tail.
-    void UnfreeLargeTail(RegionSpace* region_space, uint32_t alloc_time)
+    EXPORT void UnfreeLargeTail(RegionSpace* region_space, uint32_t alloc_time)
         REQUIRES(region_space->region_lock_);
 
     void MarkAsAllocated(RegionSpace* region_space, uint32_t alloc_time)
@@ -715,7 +715,7 @@ class RegionSpace final : public ContinuousMemMapAllocSpace {
     }
   }
 
-  Region* AllocateRegion(bool for_evac) REQUIRES(region_lock_);
+  EXPORT Region* AllocateRegion(bool for_evac) REQUIRES(region_lock_);
   void RevokeThreadLocalBuffersLocked(Thread* thread, bool reuse) REQUIRES(region_lock_);
 
   // Scan region range [`begin`, `end`) in increasing order to try to
diff --git a/runtime/gc/space/rosalloc_space-inl.h b/runtime/gc/space/rosalloc_space-inl.h
index 09aa7cf8a3..f37376377e 100644
--- a/runtime/gc/space/rosalloc_space-inl.h
+++ b/runtime/gc/space/rosalloc_space-inl.h
@@ -24,7 +24,7 @@
 #include "gc/space/memory_tool_settings.h"
 #include "thread.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/rosalloc_space.cc b/runtime/gc/space/rosalloc_space.cc
index 86a5d3a794..2639755015 100644
--- a/runtime/gc/space/rosalloc_space.cc
+++ b/runtime/gc/space/rosalloc_space.cc
@@ -31,7 +31,7 @@
 #include "thread.h"
 #include "thread_list.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/rosalloc_space.h b/runtime/gc/space/rosalloc_space.h
index 7becea0828..712b344a4f 100644
--- a/runtime/gc/space/rosalloc_space.h
+++ b/runtime/gc/space/rosalloc_space.h
@@ -21,7 +21,7 @@
 #include "malloc_space.h"
 #include "space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 
 namespace collector {
diff --git a/runtime/gc/space/rosalloc_space_random_test.cc b/runtime/gc/space/rosalloc_space_random_test.cc
index 3010b775f3..211c6be515 100644
--- a/runtime/gc/space/rosalloc_space_random_test.cc
+++ b/runtime/gc/space/rosalloc_space_random_test.cc
@@ -18,7 +18,7 @@
 
 #include "rosalloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 namespace {
diff --git a/runtime/gc/space/rosalloc_space_static_test.cc b/runtime/gc/space/rosalloc_space_static_test.cc
index 860a4615e4..fcb03cec65 100644
--- a/runtime/gc/space/rosalloc_space_static_test.cc
+++ b/runtime/gc/space/rosalloc_space_static_test.cc
@@ -18,7 +18,7 @@
 
 #include "rosalloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 namespace {
diff --git a/runtime/gc/space/space-inl.h b/runtime/gc/space/space-inl.h
index 3ea68cf9ca..d5fb081a78 100644
--- a/runtime/gc/space/space-inl.h
+++ b/runtime/gc/space/space-inl.h
@@ -24,7 +24,7 @@
 #include "image_space.h"
 #include "large_object_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/space.cc b/runtime/gc/space/space.cc
index cae9ce8f06..5fc09b83df 100644
--- a/runtime/gc/space/space.cc
+++ b/runtime/gc/space/space.cc
@@ -25,7 +25,7 @@
 #include "runtime.h"
 #include "thread-current-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/space.h b/runtime/gc/space/space.h
index 160c73097c..abe26b4e26 100644
--- a/runtime/gc/space/space.h
+++ b/runtime/gc/space/space.h
@@ -28,7 +28,7 @@
 #include "gc/collector/object_byte_pair.h"
 #include "runtime_globals.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace mirror {
 class Object;
 }  // namespace mirror
@@ -77,7 +77,7 @@ enum SpaceType {
 std::ostream& operator<<(std::ostream& os, SpaceType space_type);
 
 // A space contains memory allocated for managed objects.
-class Space {
+class EXPORT Space {
  public:
   // Dump space. Also key method for C++ vtables.
   virtual void Dump(std::ostream& os) const;
diff --git a/runtime/gc/space/space_create_test.cc b/runtime/gc/space/space_create_test.cc
index 25bc12e85b..83568351b3 100644
--- a/runtime/gc/space/space_create_test.cc
+++ b/runtime/gc/space/space_create_test.cc
@@ -20,7 +20,7 @@
 #include "rosalloc_space.h"
 #include "scoped_thread_state_change-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/space_test.h b/runtime/gc/space/space_test.h
index 4b01e83b38..2be1b9445a 100644
--- a/runtime/gc/space/space_test.h
+++ b/runtime/gc/space/space_test.h
@@ -31,7 +31,7 @@
 #include "thread_list.h"
 #include "zygote_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/zygote_space.cc b/runtime/gc/space/zygote_space.cc
index f40061ff88..cab183ef94 100644
--- a/runtime/gc/space/zygote_space.cc
+++ b/runtime/gc/space/zygote_space.cc
@@ -25,7 +25,7 @@
 #include "runtime.h"
 #include "thread-current-inl.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 namespace space {
 
diff --git a/runtime/gc/space/zygote_space.h b/runtime/gc/space/zygote_space.h
index 3ebc943d96..12cc5c7e8b 100644
--- a/runtime/gc/space/zygote_space.h
+++ b/runtime/gc/space/zygote_space.h
@@ -21,7 +21,7 @@
 #include "gc/accounting/space_bitmap.h"
 #include "malloc_space.h"
 
-namespace art {
+namespace art HIDDEN {
 namespace gc {
 
 namespace space {