vendor/lldb/lldb-release_39-r276489

1 files changed, 41 insertions, 0 deletions

diff --git a/source/Plugins/Process/Linux/SingleStepCheck.h b/source/Plugins/Process/Linux/SingleStepCheck.h
new file mode 100644
index 000000000000..f83f7c973f8d
--- /dev/null
+++ b/source/Plugins/Process/Linux/SingleStepCheck.h
@@ -0,0 +1,41 @@
+//===-- SingleStepCheck.h ------------------------------------- -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_SingleStepCheck_H_
+#define liblldb_SingleStepCheck_H_
+
+namespace lldb_private
+{
+namespace process_linux
+{
+
+namespace impl
+{
+extern bool
+SingleStepWorkaroundNeeded();
+}
+
+// arm64 linux had a bug which prevented single-stepping and watchpoints from working on non-boot
+// cpus, due to them being incorrectly initialized after coming out of suspend.  This issue is
+// particularly affecting android M, which uses suspend ("doze mode") quite aggressively. This
+// code detects that situation and makes single-stepping work by doing all the step operations on
+// the boot cpu.
+//
+// The underlying issue has been fixed in android N and linux 4.4. This code can be removed once
+// these systems become obsolete.
+inline bool
+SingleStepWorkaroundNeeded()
+{
+    static bool value = impl::SingleStepWorkaroundNeeded();
+    return value;
+}
+} // end namespace process_linux
+} // end namespace lldb_private
+
+#endif // #ifndef liblldb_SingleStepCheck_H_