MSan does not understand inline asm. This change preinitializes cpuid

results, and disables the use of stos.

Random mmap() addresses conflict with sanitizer memory layout.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/212723003

Patch from Evgeniy Stepanov <eugenis@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/atomicops_internals_x86_gcc.cc

@@ -77,10 +77,10 @@ namespace {
 void AtomicOps_Internalx86CPUFeaturesInit() {
   using v8::internal::AtomicOps_Internalx86CPUFeatures;
 
-  uint32_t eax;
-  uint32_t ebx;
-  uint32_t ecx;
-  uint32_t edx;
+  uint32_t eax = 0;
+  uint32_t ebx = 0;
+  uint32_t ecx = 0;
+  uint32_t edx = 0;
 
   // Get vendor string (issue CPUID with eax = 0)
   cpuid(eax, ebx, ecx, edx, 0);

src/platform-posix.cc

@@ -213,6 +213,11 @@ void* OS::GetRandomMmapAddr() {
   // smarter about using mmap address hints.
   // See http://code.google.com/p/nativeclient/issues/3341
   return NULL;
+#endif
+#if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
+    defined(THREAD_SANITIZER)
+  // Dynamic tools do not support custom mmap addresses.
+  return NULL;
 #endif
   Isolate* isolate = Isolate::UncheckedCurrent();
   // Note that the current isolate isn't set up in a call path via

src/v8utils.h

@@ -215,6 +215,11 @@ inline void MemsetPointer(T** dest, U* value, int counter) {
 #undef STOS
 #endif
 
+#if defined(MEMORY_SANITIZER)
+  // MemorySanitizer does not understand inline assembly.
+#undef STOS
+#endif
+
 #if defined(__GNUC__) && defined(STOS)
   asm volatile(
       "cld;"