Index: lib/asan/asan_allocator.h
===================================================================
--- lib/asan/asan_allocator.h
+++ lib/asan/asan_allocator.h
@@ -161,10 +161,17 @@
 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
 # endif
 typedef CompactSizeClassMap SizeClassMap;
-typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, 16,
-  SizeClassMap, kRegionSizeLog,
-  ByteMap,
-  AsanMapUnmapCallback> PrimaryAllocator;
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = 16;
+  typedef __asan::SizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = __asan::kRegionSizeLog;
+  typedef __asan::ByteMap ByteMap;
+  typedef AsanMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
 static const uptr kNumberOfSizeClasses = SizeClassMap::kNumClasses;
Index: lib/lsan/lsan_allocator.h
===================================================================
--- lib/lsan/lsan_allocator.h
+++ lib/lsan/lsan_allocator.h
@@ -55,10 +55,18 @@
 static const uptr kRegionSizeLog = 20;
 static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
 typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
-typedef CompactSizeClassMap SizeClassMap;
-typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE,
-    sizeof(ChunkMetadata), SizeClassMap, kRegionSizeLog, ByteMap>
-    PrimaryAllocator;
+
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = sizeof(ChunkMetadata);
+  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = __lsan::kRegionSizeLog;
+  typedef __lsan::ByteMap ByteMap;
+  typedef NoOpMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #elif defined(__x86_64__) || defined(__powerpc64__)
 struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
   static const uptr kSpaceBeg = 0x600000000000ULL;
Index: lib/msan/msan_allocator.cc
===================================================================
--- lib/msan/msan_allocator.cc
+++ lib/msan/msan_allocator.cc
@@ -47,12 +47,18 @@
   static const uptr kRegionSizeLog = 20;
   static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
   typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
-  typedef CompactSizeClassMap SizeClassMap;
-
-  typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, sizeof(Metadata),
-                               SizeClassMap, kRegionSizeLog, ByteMap,
-                               MsanMapUnmapCallback> PrimaryAllocator;
 
+  struct AP32 {
+    static const uptr kSpaceBeg = 0;
+    static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+    static const uptr kMetadataSize = sizeof(Metadata);
+    typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+    static const uptr kRegionSizeLog = __msan::kRegionSizeLog;
+    typedef __msan::ByteMap ByteMap;
+    typedef MsanMapUnmapCallback MapUnmapCallback;
+    static const uptr kFlags = 0;
+  };
+  typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #elif defined(__x86_64__)
 #if SANITIZER_LINUX && !defined(MSAN_LINUX_X86_64_OLD_MAPPING)
   static const uptr kAllocatorSpace = 0x700000000000ULL;
@@ -90,11 +96,18 @@
   static const uptr kRegionSizeLog = 20;
   static const uptr kNumRegions = SANITIZER_MMAP_RANGE_SIZE >> kRegionSizeLog;
   typedef TwoLevelByteMap<(kNumRegions >> 12), 1 << 12> ByteMap;
-  typedef CompactSizeClassMap SizeClassMap;
 
-  typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, sizeof(Metadata),
-                               SizeClassMap, kRegionSizeLog, ByteMap,
-                               MsanMapUnmapCallback> PrimaryAllocator;
+  struct AP32 {
+    static const uptr kSpaceBeg = 0;
+    static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+    static const uptr kMetadataSize = sizeof(Metadata);
+    typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+    static const uptr kRegionSizeLog = __msan::kRegionSizeLog;
+    typedef __msan::ByteMap ByteMap;
+    typedef MsanMapUnmapCallback MapUnmapCallback;
+    static const uptr kFlags = 0;
+  };
+  typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #endif
 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
 typedef LargeMmapAllocator<MsanMapUnmapCallback> SecondaryAllocator;
Index: lib/sanitizer_common/sanitizer_allocator_internal.h
===================================================================
--- lib/sanitizer_common/sanitizer_allocator_internal.h
+++ lib/sanitizer_common/sanitizer_allocator_internal.h
@@ -23,21 +23,25 @@
 // purposes.
 typedef CompactSizeClassMap InternalSizeClassMap;
 
-static const uptr kInternalAllocatorSpace = 0;
-static const u64 kInternalAllocatorSize = SANITIZER_MMAP_RANGE_SIZE;
 static const uptr kInternalAllocatorRegionSizeLog = 20;
-#if SANITIZER_WORDSIZE == 32
 static const uptr kInternalAllocatorNumRegions =
-    kInternalAllocatorSize >> kInternalAllocatorRegionSizeLog;
+    SANITIZER_MMAP_RANGE_SIZE >> kInternalAllocatorRegionSizeLog;
+#if SANITIZER_WORDSIZE == 32
 typedef FlatByteMap<kInternalAllocatorNumRegions> ByteMap;
 #else
-static const uptr kInternalAllocatorNumRegions =
-    kInternalAllocatorSize >> kInternalAllocatorRegionSizeLog;
 typedef TwoLevelByteMap<(kInternalAllocatorNumRegions >> 12), 1 << 12> ByteMap;
 #endif
-typedef SizeClassAllocator32<
-    kInternalAllocatorSpace, kInternalAllocatorSize, 0, InternalSizeClassMap,
-    kInternalAllocatorRegionSizeLog, ByteMap> PrimaryInternalAllocator;
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = 0;
+  typedef InternalSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = kInternalAllocatorRegionSizeLog;
+  typedef __sanitizer::ByteMap ByteMap;
+  typedef NoOpMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryInternalAllocator;
 
 typedef SizeClassAllocatorLocalCache<PrimaryInternalAllocator>
     InternalAllocatorCache;
Index: lib/sanitizer_common/sanitizer_allocator_primary32.h
===================================================================
--- lib/sanitizer_common/sanitizer_allocator_primary32.h
+++ lib/sanitizer_common/sanitizer_allocator_primary32.h
@@ -36,13 +36,27 @@
 //
 // In order to avoid false sharing the objects of this class should be
 // chache-line aligned.
-template <const uptr kSpaceBeg, const u64 kSpaceSize,
-          const uptr kMetadataSize, class SizeClassMap,
-          const uptr kRegionSizeLog,
-          class ByteMap,
-          class MapUnmapCallback = NoOpMapUnmapCallback>
+
+struct SizeClassAllocator32FlagMasks {  //  Bit masks.
+  enum {
+    kRandomShuffleChunks = 1,
+  };
+};
+
+template <class Params>
 class SizeClassAllocator32 {
  public:
+  static const uptr kSpaceBeg = Params::kSpaceBeg;
+  static const u64 kSpaceSize = Params::kSpaceSize;
+  static const uptr kMetadataSize = Params::kMetadataSize;
+  typedef typename Params::SizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = Params::kRegionSizeLog;
+  typedef typename Params::ByteMap ByteMap;
+  typedef typename Params::MapUnmapCallback MapUnmapCallback;
+
+  static const bool kRandomShuffleChunks =
+      Params::kFlags & SizeClassAllocator32FlagMasks::kRandomShuffleChunks;
+
   struct TransferBatch {
     static const uptr kMaxNumCached = SizeClassMap::kMaxNumCachedHint - 2;
     void SetFromArray(uptr region_beg_unused, void *batch[], uptr count) {
@@ -86,8 +100,7 @@
     return SizeClassMap::Size(class_id);
   }
 
-  typedef SizeClassAllocator32<kSpaceBeg, kSpaceSize, kMetadataSize,
-      SizeClassMap, kRegionSizeLog, ByteMap, MapUnmapCallback> ThisT;
+  typedef SizeClassAllocator32<Params> ThisT;
   typedef SizeClassAllocator32LocalCache<ThisT> AllocatorCache;
 
   void Init(s32 release_to_os_interval_ms) {
Index: lib/sanitizer_common/tests/sanitizer_allocator_test.cc
===================================================================
--- lib/sanitizer_common/tests/sanitizer_allocator_test.cc
+++ lib/sanitizer_common/tests/sanitizer_allocator_test.cc
@@ -108,13 +108,17 @@
 static const uptr kRegionSizeLog = FIRST_32_SECOND_64(20, 24);
 static const uptr kFlatByteMapSize = kAddressSpaceSize >> kRegionSizeLog;
 
-typedef SizeClassAllocator32<
-  0, kAddressSpaceSize,
-  /*kMetadataSize*/16,
-  CompactSizeClassMap,
-  kRegionSizeLog,
-  FlatByteMap<kFlatByteMapSize> >
-  Allocator32Compact;
+struct AP32Compact {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = kAddressSpaceSize;
+  static const uptr kMetadataSize = 16;
+  typedef CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = ::kRegionSizeLog;
+  typedef FlatByteMap<kFlatByteMapSize> ByteMap;
+  typedef NoOpMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32Compact> Allocator32Compact;
 
 template <class SizeClassMap>
 void TestSizeClassMap() {
@@ -386,17 +390,21 @@
 #endif
 #endif
 
+struct AP32WithCallback {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = kAddressSpaceSize;
+  static const uptr kMetadataSize = 16;
+  typedef CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = ::kRegionSizeLog;
+  typedef FlatByteMap<kFlatByteMapSize> ByteMap;
+  typedef TestMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+
 TEST(SanitizerCommon, SizeClassAllocator32MapUnmapCallback) {
   TestMapUnmapCallback::map_count = 0;
   TestMapUnmapCallback::unmap_count = 0;
-  typedef SizeClassAllocator32<
-      0, kAddressSpaceSize,
-      /*kMetadataSize*/16,
-      CompactSizeClassMap,
-      kRegionSizeLog,
-      FlatByteMap<kFlatByteMapSize>,
-      TestMapUnmapCallback>
-    Allocator32WithCallBack;
+  typedef SizeClassAllocator32<AP32WithCallback> Allocator32WithCallBack;
   Allocator32WithCallBack *a = new Allocator32WithCallBack;
   a->Init(kReleaseToOSIntervalNever);
   EXPECT_EQ(TestMapUnmapCallback::map_count, 0);
Index: lib/scudo/scudo_allocator.h
===================================================================
--- lib/scudo/scudo_allocator.h
+++ lib/scudo/scudo_allocator.h
@@ -80,7 +80,7 @@
 const uptr AllocatorSize = 0x40000000000ULL;  // 4T.
 # endif
 typedef DefaultSizeClassMap SizeClassMap;
-struct AP {
+struct AP64 {
   static const uptr kSpaceBeg = AllocatorSpace;
   static const uptr kSpaceSize = AllocatorSize;
   static const uptr kMetadataSize = 0;
@@ -89,7 +89,7 @@
   static const uptr kFlags =
       SizeClassAllocator64FlagMasks::kRandomShuffleChunks;
 };
-typedef SizeClassAllocator64<AP> PrimaryAllocator;
+typedef SizeClassAllocator64<AP64> PrimaryAllocator;
 #else
 // Currently, the 32-bit Sanitizer allocator has not yet benefited from all the
 // security improvements brought to the 64-bit one. This makes the 32-bit
@@ -102,8 +102,18 @@
 typedef TwoLevelByteMap<(NumRegions >> 12), 1 << 12> ByteMap;
 # endif  // SANITIZER_WORDSIZE
 typedef DefaultSizeClassMap SizeClassMap;
-typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, 0, SizeClassMap,
-    RegionSizeLog, ByteMap> PrimaryAllocator;
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = 0;
+  typedef __scudo::SizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = RegionSizeLog;
+  typedef __scudo::ByteMap ByteMap;
+  typedef NoOpMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags =
+      SizeClassAllocator32FlagMasks::kRandomShuffleChunks;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
 #include "scudo_allocator_secondary.h"
Index: lib/tsan/rtl/tsan_rtl.h
===================================================================
--- lib/tsan/rtl/tsan_rtl.h
+++ lib/tsan/rtl/tsan_rtl.h
@@ -55,16 +55,22 @@
 #if !SANITIZER_GO
 struct MapUnmapCallback;
 #if defined(__mips64) || defined(__aarch64__) || defined(__powerpc__)
-static const uptr kAllocatorSpace = 0;
-static const uptr kAllocatorSize = SANITIZER_MMAP_RANGE_SIZE;
 static const uptr kAllocatorRegionSizeLog = 20;
 static const uptr kAllocatorNumRegions =
-    kAllocatorSize >> kAllocatorRegionSizeLog;
+    SANITIZER_MMAP_RANGE_SIZE >> kAllocatorRegionSizeLog;
 typedef TwoLevelByteMap<(kAllocatorNumRegions >> 12), 1 << 12,
     MapUnmapCallback> ByteMap;
-typedef SizeClassAllocator32<kAllocatorSpace, kAllocatorSize, 0,
-    CompactSizeClassMap, kAllocatorRegionSizeLog, ByteMap,
-    MapUnmapCallback> PrimaryAllocator;
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = 0;
+  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = kAllocatorRegionSizeLog;
+  typedef __tsan::ByteMap ByteMap;
+  typedef __tsan::MapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
 #else
 struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
   static const uptr kSpaceBeg = Mapping::kHeapMemBeg;