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[llvm-exegesis] Check perf event validity. 

This was part of https://reviews.llvm.org/D46821.

Authored by Guillaume Chatelet

llvm-svn: 332330
This commit is contained in:
Clement Courbet 2018-05-15 07:35:21 +00:00
parent 11adbacac8
commit 27d4ca2df9
1 changed files with 5 additions and 1 deletions
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6
llvm/tools/llvm-exegesis/lib/PerfHelper.cpp
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@ -15,6 +15,7 @@
#include "perfmon/pfmlib.h"
#include "perfmon/pfmlib_perf_event.h"
#endif
#include <cassert>
namespace exegesis {
namespace pfm {
@ -88,6 +89,7 @@ llvm::StringRef PerfEvent::getPfmEventString() const {
#ifdef HAVE_LIBPFM
Counter::Counter(const PerfEvent &Event) {
assert(Event.valid());
const pid_t Pid = 0; // measure current process/thread.
const int Cpu = -1; // measure any processor.
const int GroupFd = -1; // no grouping of counters.
@ -108,8 +110,10 @@ void Counter::stop() { ioctl(FileDescriptor, PERF_EVENT_IOC_DISABLE, 0); }
int64_t Counter::read() const {
int64_t Count = 0;
ssize_t ReadSize = ::read(FileDescriptor, &Count, sizeof(Count));
if (ReadSize != sizeof(Count))
if (ReadSize != sizeof(Count)) {
Count = -1;
llvm::errs() << "Failed to read event counter\n";
}
return Count;
}