[llvm-commits] [llvm] r157317 - /llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp

[Evgeniy Stepanov]

Author: eugenis
Date: Wed May 23 06:52:12 2012
New Revision: 157317

URL: http://llvm.org/viewvc/llvm-project?rev=157317&view=rev
Log:
Use zero-based shadow by default on Android.


Modified:
    llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp

Modified: llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp?rev=157317&r1=157316&r2=157317&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp Wed May 23 06:52:12 2012
@@ -22,6 +22,7 @@
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/Function.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/LLVMContext.h"
@@ -47,6 +48,7 @@
 static const uint64_t kDefaultShadowScale = 3;
 static const uint64_t kDefaultShadowOffset32 = 1ULL << 29;
 static const uint64_t kDefaultShadowOffset64 = 1ULL << 44;
+static const uint64_t kDefaultShadowOffsetAndroid = 0;
 
 static const size_t kMaxStackMallocSize = 1 << 16;  // 64K
 static const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3;
@@ -571,8 +573,11 @@
   AsanInitFunction->setLinkage(Function::ExternalLinkage);
   IRB.CreateCall(AsanInitFunction);
 
-  MappingOffset = LongSize == 32
-      ? kDefaultShadowOffset32 : kDefaultShadowOffset64;
+  llvm::Triple targetTriple(M.getTargetTriple());
+  bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::ANDROIDEABI;
+
+  MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid :
+    (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64);
   if (ClMappingOffsetLog >= 0) {
     if (ClMappingOffsetLog == 0) {
       // special case