diff options
Diffstat (limited to 'llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp index f2b5179b436..635e0894d94 100644 --- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp +++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp @@ -204,10 +204,13 @@ static cl::opt<bool> ClSkipPromotableAllocas( // These flags allow to change the shadow mapping. // The shadow mapping looks like -// Shadow = (Mem >> scale) + (1 << offset_log) +// Shadow = (Mem >> scale) + offset static cl::opt<int> ClMappingScale("asan-mapping-scale", cl::desc("scale of asan shadow mapping"), cl::Hidden, cl::init(0)); +static cl::opt<unsigned long long> ClMappingOffset("asan-mapping-offset", + cl::desc("offset of asan shadow mapping [EXPERIMENTAL]"), + cl::Hidden, cl::init(0)); // Optimization flags. Not user visible, used mostly for testing // and benchmarking the tool. @@ -404,10 +407,14 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize, } Mapping.Scale = kDefaultShadowScale; - if (ClMappingScale) { + if (ClMappingScale.getNumOccurrences() > 0) { Mapping.Scale = ClMappingScale; } + if (ClMappingOffset.getNumOccurrences() > 0) { + Mapping.Offset = ClMappingOffset; + } + // OR-ing shadow offset if more efficient (at least on x86) if the offset // is a power of two, but on ppc64 we have to use add since the shadow // offset is not necessary 1/8-th of the address space. On SystemZ, |
