[PATCH] D43981: [XRay] [compiler-rt] [macosx] Add getTSCFrequency implementation for macOS.

[Nicholas Levin via Phabricator via llvm-commits]

nglevin created this revision.
nglevin added a reviewer: dberris.
Herald added subscribers: Sanitizers, llvm-commits, delcypher.

Use mach_absolute_time and mach_timebase as an alternative to clock_gettime(2) on macOS platforms, to support earlier versions of the OS.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D43981

Files:
  lib/xray/xray_x86_64.cc


Index: lib/xray/xray_x86_64.cc
===================================================================
--- lib/xray/xray_x86_64.cc
+++ lib/xray/xray_x86_64.cc
@@ -6,6 +6,8 @@
 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
 #include <sys/types.h>
 #include <sys/sysctl.h>
+#elif SANITIZER_MAC
+#include <mach/mach_time.h>
 #endif
 
 #include <atomic>
@@ -92,6 +94,18 @@
     return 0;
     
 }
+#elif SANITIZER_MAC
+static mach_timebase_info_data_t TimebaseInfo;
+
+uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT {
+    if (TimebaseInfo.denom == 0) {
+      mach_timebase_info(&TimebaseInfo);
+    }
+    uint64_t currentTime = mach_absolute_time();
+    currentTime *= TimebaseInfo.numer;
+    currentTime /= TimebaseInfo.denom;
+    return currentTime;
+}
 #else
 uint64_t getTSCFrequency() XRAY_NEVER_INSTRUMENT {
     /* Not supported */


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