1 files changed, 46 insertions, 0 deletions
diff --git a/lib/tsan/rtl/tsan_stack_trace.cc b/lib/tsan/rtl/tsan_stack_trace.cc
new file mode 100644
index 0000000000000..ceca3f8e8738d
--- /dev/null
+++ b/lib/tsan/rtl/tsan_stack_trace.cc
@@ -0,0 +1,46 @@
+//===-- tsan_stack_trace.cc -----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer (TSan), a race detector.
+//
+//===----------------------------------------------------------------------===//
+#include "tsan_stack_trace.h"
+#include "tsan_rtl.h"
+#include "tsan_mman.h"
+
+namespace __tsan {
+
+VarSizeStackTrace::VarSizeStackTrace()
+    : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
+
+VarSizeStackTrace::~VarSizeStackTrace() {
+  ResizeBuffer(0);
+}
+
+void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
+  if (trace_buffer) {
+    internal_free(trace_buffer);
+  }
+  trace_buffer =
+      (new_size > 0)
+          ? (uptr *)internal_alloc(MBlockStackTrace,
+                                   new_size * sizeof(trace_buffer[0]))
+          : nullptr;
+  trace = trace_buffer;
+  size = new_size;
+}
+
+void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
+  ResizeBuffer(cnt + !!extra_top_pc);
+  internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
+  if (extra_top_pc)
+    trace_buffer[cnt] = extra_top_pc;
+}
+
+}  // namespace __tsan