[PATCH] add supporting ASAN instrumentation on FreeBSD platform

[Viktor Kutuzov]

Hi kcc,

This patch adds the shadow range offsets to support the Address Sanitizer instrumentation on FreeBSD platform (9.x).

http://llvm-reviews.chandlerc.com/D2635

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp

Index: lib/Transforms/Instrumentation/AddressSanitizer.cpp
===================================================================
--- lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -59,6 +59,8 @@
 static const uint64_t kDefaultShort64bitShadowOffset = 0x7FFF8000;  // < 2G.
 static const uint64_t kPPC64_ShadowOffset64 = 1ULL << 41;
 static const uint64_t kMIPS32_ShadowOffset32 = 0x0aaa8000;
+static const uint64_t kFreeBSD_ShadowOffset32 = 1ULL << 30;
+static const uint64_t kFreeBSD_ShadowOffset64 = 1ULL << 46;
 
 static const size_t kMinStackMallocSize = 1 << 6;  // 64B
 static const size_t kMaxStackMallocSize = 1 << 16;  // 64K
@@ -239,6 +241,7 @@
   llvm::Triple TargetTriple(M.getTargetTriple());
   bool IsAndroid = TargetTriple.getEnvironment() == llvm::Triple::Android;
   bool IsMacOSX = TargetTriple.getOS() == llvm::Triple::MacOSX;
+  bool IsFreeBSD = TargetTriple.getOS() == llvm::Triple::FreeBSD;
   bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64 ||
                  TargetTriple.getArch() == llvm::Triple::ppc64le;
   bool IsX86_64 = TargetTriple.getArch() == llvm::Triple::x86_64;
@@ -254,11 +257,13 @@
 
   Mapping.Offset = (IsAndroid || ZeroBaseShadow) ? 0 :
       (LongSize == 32 ?
-       (IsMIPS32 ? kMIPS32_ShadowOffset32 : kDefaultShadowOffset32) :
+       (IsMIPS32 ? kMIPS32_ShadowOffset32 :
+        (IsFreeBSD ? kFreeBSD_ShadowOffset32 : kDefaultShadowOffset32)) :
        IsPPC64 ? kPPC64_ShadowOffset64 : kDefaultShadowOffset64);
   if (!ZeroBaseShadow && ClShort64BitOffset && IsX86_64 && !IsMacOSX) {
     assert(LongSize == 64);
-    Mapping.Offset = kDefaultShort64bitShadowOffset;
+    Mapping.Offset = (IsFreeBSD ?
+                      kFreeBSD_ShadowOffset64 : kDefaultShort64bitShadowOffset);
   }
   if (!ZeroBaseShadow && ClMappingOffsetLog >= 0) {
     // Zero offset log is the special case.
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