[clang] [compiler-rt] [llvm] Dataflow Sanitizer support for SystemZ. (PR #162195)

[Thurston Dang via cfe-commits]

================
@@ -44,9 +44,24 @@ struct DFsanMapUnmapCallback {
 // duplicated as MappingDesc::ALLOCATOR in dfsan_platform.h.
 #if defined(__aarch64__)
 const uptr kAllocatorSpace = 0xE00000000000ULL;
+#elif defined(__s390x__)
+const uptr kAllocatorSpace = 0x440000000000ULL;
 #else
 const uptr kAllocatorSpace = 0x700000000000ULL;
 #endif
+#if defined(__s390x__)
+const uptr kMaxAllowedMallocSize = 2UL << 30;  // 2G
+
+struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+  static const uptr kSpaceBeg = kAllocatorSpace;
+  static const uptr kSpaceSize = 0x020000000000;  // 2T.
+  static const uptr kMetadataSize = sizeof(Metadata);
+  using SizeClassMap = DefaultSizeClassMap;
+  using MapUnmapCallback = DFsanMapUnmapCallback;
+  static const uptr kFlags = 0;
+  using AddressSpaceView = LocalAddressSpaceView;
+};
+#else
----------------
thurstond wrote:

Looks like the allocator and shadow constants are the tried-and-tested constants from MSan?

https://github.com/llvm/llvm-project/pull/162195