From a7018c1d070645a9ac6fe476933b02ebf48e9d9c Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka@google.com>
Date: Sat, 23 Sep 2017 02:47:21 +0000
Subject: [ubsan] Replace CommonSanitizerReportMutex with ScopedErrorReportLock

Reviewers: eugenis, alekseyshl

Subscribers: kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D38194

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@314053 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/sanitizer_common/sanitizer_common.h          |  2 ++
 lib/sanitizer_common/sanitizer_common_libcdep.cc |  4 ++++
 lib/ubsan/ubsan_diag.cc                          | 10 ++++------
 lib/ubsan/ubsan_diag.h                           |  8 ++++++++
 4 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/lib/sanitizer_common/sanitizer_common.h b/lib/sanitizer_common/sanitizer_common.h
index 0c5ea0999..a65f732eb 100644
--- a/lib/sanitizer_common/sanitizer_common.h
+++ b/lib/sanitizer_common/sanitizer_common.h
@@ -213,6 +213,8 @@ class ScopedErrorReportLock {
  public:
   ScopedErrorReportLock();
   ~ScopedErrorReportLock();
+
+  static void CheckLocked();
 };
 
 extern uptr stoptheworld_tracer_pid;
diff --git a/lib/sanitizer_common/sanitizer_common_libcdep.cc b/lib/sanitizer_common/sanitizer_common_libcdep.cc
index cce544dd8..4048960a0 100644
--- a/lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -334,6 +334,10 @@ ScopedErrorReportLock::~ScopedErrorReportLock() {
   atomic_store_relaxed(&reporting_thread, 0);
 }
 
+void ScopedErrorReportLock::CheckLocked() {
+  CommonSanitizerReportMutex.CheckLocked();
+}
+
 }  // namespace __sanitizer
 
 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_sandbox_on_notify,
diff --git a/lib/ubsan/ubsan_diag.cc b/lib/ubsan/ubsan_diag.cc
index e73fe9042..bc170660c 100644
--- a/lib/ubsan/ubsan_diag.cc
+++ b/lib/ubsan/ubsan_diag.cc
@@ -337,7 +337,7 @@ static void PrintMemorySnippet(const Decorator &Decor, MemoryLocation Loc,
 
 Diag::~Diag() {
   // All diagnostics should be printed under report mutex.
-  CommonSanitizerReportMutex.CheckLocked();
+  ScopedReport::CheckLocked();
   Decorator Decor;
   InternalScopedString Buffer(1024);
 
@@ -365,17 +365,15 @@ Diag::~Diag() {
     PrintMemorySnippet(Decor, Loc.getMemoryLocation(), Ranges, NumRanges, Args);
 }
 
+ScopedReport::Initializer::Initializer() { InitAsStandaloneIfNecessary(); }
+
 ScopedReport::ScopedReport(ReportOptions Opts, Location SummaryLoc,
                            ErrorType Type)
-    : Opts(Opts), SummaryLoc(SummaryLoc), Type(Type) {
-  InitAsStandaloneIfNecessary();
-  CommonSanitizerReportMutex.Lock();
-}
+    : Opts(Opts), SummaryLoc(SummaryLoc), Type(Type) {}
 
 ScopedReport::~ScopedReport() {
   MaybePrintStackTrace(Opts.pc, Opts.bp);
   MaybeReportErrorSummary(SummaryLoc, Type);
-  CommonSanitizerReportMutex.Unlock();
   if (flags()->halt_on_error)
     Die();
 }
diff --git a/lib/ubsan/ubsan_diag.h b/lib/ubsan/ubsan_diag.h
index 2e1983947..72b258628 100644
--- a/lib/ubsan/ubsan_diag.h
+++ b/lib/ubsan/ubsan_diag.h
@@ -239,6 +239,12 @@ void GetStackTraceWithPcBpAndContext(BufferedStackTrace *stack, uptr max_depth,
 /// report. This class ensures that reports from different threads and from
 /// different sanitizers won't be mixed.
 class ScopedReport {
+  struct Initializer {
+    Initializer();
+  };
+  Initializer initializer_;
+  ScopedErrorReportLock report_lock_;
+
   ReportOptions Opts;
   Location SummaryLoc;
   ErrorType Type;
@@ -246,6 +252,8 @@ class ScopedReport {
 public:
   ScopedReport(ReportOptions Opts, Location SummaryLoc, ErrorType Type);
   ~ScopedReport();
+
+  static void CheckLocked() { ScopedErrorReportLock::CheckLocked(); }
 };
 
 void InitializeSuppressions();
-- 
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