[asan] On OS X, tag mapped regions with VM_MEMORY_ANALYSIS_TOOL tag

This will tag all mmapped memory sanitizers use with "Performance tool data"
when viewed in vmmap. (Even though sanitizers are not performance tools, it's
the best available match and better than having the unidentified objects.)

http://reviews.llvm.org/D13609

llvm-svn: 251445

1 files changed, 2 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index d448ddaba64..3151cf8b911 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -41,6 +41,7 @@ extern char **environ;
 #include <libkern/OSAtomic.h>
 #include <mach-o/dyld.h>
 #include <mach/mach.h>
+#include <mach/vm_statistics.h>
 #include <pthread.h>
 #include <sched.h>
 #include <signal.h>
@@ -59,6 +60,7 @@ namespace __sanitizer {
 // ---------------------- sanitizer_libc.h
 uptr internal_mmap(void *addr, size_t length, int prot, int flags,
                    int fd, u64 offset) {
+  if (fd == -1) fd = VM_MAKE_TAG(VM_MEMORY_ANALYSIS_TOOL);
   return (uptr)mmap(addr, length, prot, flags, fd, offset);
 }