[PATCH] D13609: [asan] On OS X, tag mapped regions with VM_MEMORY_ANALYSIS_TOOL tag

[Anna Zaks via llvm-commits]

zaks.anna created this revision.
zaks.anna added reviewers: kcc, glider, kubabrecka.
zaks.anna added a subscriber: llvm-commits.

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

Files:
  lib/sanitizer_common/sanitizer_mac.cc

Index: lib/sanitizer_common/sanitizer_mac.cc
===================================================================
--- lib/sanitizer_common/sanitizer_mac.cc
+++ lib/sanitizer_common/sanitizer_mac.cc
@@ -41,6 +41,7 @@
 #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 @@
 // ---------------------- 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);
 }
 


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