[scudo] Scudo thread specific data refactor, part 3

Summary:
Previous parts: D38139, D38183.

In this part of the refactor, we abstract the Linux vs Android TSD dissociation
in favor of a Exclusive vs Shared one, allowing for easier platform introduction
and configuration.

Most of this change consist of shuffling the files around to reflect the new
organization.

We introduce `scudo_platform.h` where platform specific definition lie. This
involves the TSD model and the platform specific allocator parameters. In an
upcoming CL, those will be configurable via defines, but we currently stick
with conservative defaults.

Reviewers: alekseyshl, dvyukov

Reviewed By: alekseyshl, dvyukov

Subscribers: srhines, llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D38244

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@314224 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 58 insertions, 0 deletions

diff --git a/lib/scudo/scudo_platform.h b/lib/scudo/scudo_platform.h
new file mode 100644
index 000000000..86ddc1a25
--- /dev/null
+++ b/lib/scudo/scudo_platform.h
@@ -0,0 +1,58 @@
+//===-- scudo_platform.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// Scudo platform specific definitions.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef SCUDO_PLATFORM_H_
+#define SCUDO_PLATFORM_H_
+
+#include "sanitizer_common/sanitizer_allocator.h"
+
+#if !SANITIZER_LINUX && !SANITIZER_FUCHSIA
+# error "The Scudo hardened allocator is not supported on this platform."
+#endif
+
+#if SANITIZER_ANDROID || SANITIZER_FUCHSIA
+// Android and Fuchsia use a pool of TSDs shared between threads.
+# define SCUDO_TSD_EXCLUSIVE 0
+#elif SANITIZER_LINUX && !SANITIZER_ANDROID
+// Non-Android Linux use an exclusive TSD per thread.
+# define SCUDO_TSD_EXCLUSIVE 1
+#else
+# error "No default TSD model defined for this platform."
+#endif  // SANITIZER_ANDROID || SANITIZER_FUCHSIA
+
+namespace __scudo {
+
+#if SANITIZER_CAN_USE_ALLOCATOR64
+# if defined(__aarch64__) && SANITIZER_ANDROID
+const uptr AllocatorSize = 0x2000000000ULL;  // 128G.
+typedef VeryCompactSizeClassMap SizeClassMap;
+# elif defined(__aarch64__)
+const uptr AllocatorSize = 0x10000000000ULL;  // 1T.
+typedef CompactSizeClassMap SizeClassMap;
+# else
+const uptr AllocatorSize = 0x40000000000ULL;  // 4T.
+typedef CompactSizeClassMap SizeClassMap;
+# endif
+#else
+# if SANITIZER_ANDROID
+static const uptr RegionSizeLog = 19;
+typedef VeryCompactSizeClassMap SizeClassMap;
+# else
+static const uptr RegionSizeLog = 20;
+typedef CompactSizeClassMap SizeClassMap;
+# endif
+#endif  // SANITIZER_CAN_USE_ALLOCATOR64
+
+}  // namespace __scudo
+
+#endif // SCUDO_PLATFORM_H_