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third_party/crashpad/crashpad/util/win/critical_section_with_debug_info.cc

Index: third_party/crashpad/crashpad/util/win/critical_section_with_debug_info.cc
diff --git a/third_party/crashpad/crashpad/util/win/critical_section_with_debug_info.cc b/third_party/crashpad/crashpad/util/win/critical_section_with_debug_info.cc
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index 0000000000000000000000000000000000000000..1613a51236e24351ed510f10f919e434e61f4825
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+++ b/third_party/crashpad/crashpad/util/win/critical_section_with_debug_info.cc
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+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/win/critical_section_with_debug_info.h"
+
+#include "base/logging.h"
+#include "util/win/get_function.h"
+
+namespace crashpad {
+
+namespace {
+
+bool CrashpadInitializeCriticalSectionEx(
+    CRITICAL_SECTION* critical_section,
+    DWORD spin_count,
+    DWORD flags) {
+  static const auto initialize_critical_section_ex =
+      GET_FUNCTION_REQUIRED(L"kernel32.dll", ::InitializeCriticalSectionEx);
+  BOOL ret =
+      initialize_critical_section_ex(critical_section, spin_count, flags);
+  if (!ret) {
+    PLOG(ERROR) << "InitializeCriticalSectionEx";
+    return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+bool InitializeCriticalSectionWithDebugInfoIfPossible(
+    CRITICAL_SECTION* critical_section) {
+  // On XP and Vista, a plain initialization causes the CRITICAL_SECTION to be
+  // allocated with .DebugInfo. On 8 and above, we can pass an additional flag
+  // to InitializeCriticalSectionEx() to force the .DebugInfo on. Before Win 8,
+  // that flag causes InitializeCriticalSectionEx() to fail. So, for XP, Vista,
+  // and 7 we use InitializeCriticalSection(), and for 8 and above,
+  // InitializeCriticalSectionEx() with the additional flag.
+  //
+  // TODO(scottmg): Try to find a solution for Win 7. It's unclear how to force
+  // it on for Win 7, however the Loader Lock does have .DebugInfo so there may
+  // be a way to do it. The comments in winnt.h imply that perhaps it's passed
+  // to InitializeCriticalSectionAndSpinCount() as the top bits of the spin
+  // count, but that doesn't appear to work. For now, we initialize a valid
+  // CRITICAL_SECTION, but without .DebugInfo.
+
+  const DWORD version = GetVersion();
+  const DWORD major_version = LOBYTE(LOWORD(version));
+  const DWORD minor_version = HIBYTE(LOWORD(version));
+  const bool win7_or_lower =
+      major_version < 6 || (major_version == 6 && minor_version <= 1);
+
+  if (win7_or_lower) {
+    InitializeCriticalSection(critical_section);
+    return true;
+  }
+
+  return CrashpadInitializeCriticalSectionEx(
+      critical_section, 0, RTL_CRITICAL_SECTION_FLAG_FORCE_DEBUG_INFO);
+}
+
+}  // namespace crashpad