[compiler-rt] [scudo] Add tracing framework (PR #156112)

[Fabio D'Urso via llvm-commits]

================
@@ -0,0 +1,48 @@
+//===-- tracing.h -----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SCUDO_TRACING_H_
+#define SCUDO_TRACING_H_
+
+#if defined(SCUDO_ENABLE_TRACING)
+
+// This file must include definitions for all of the functions below.
+#include "custom_scudo_tracing.h"
+
+#else
+
+// Should start a trace in the given scope, and end the trace when going out of
+// scope.
+#define SCUDO_SCOPED_TRACE(Name)
+
+// Create a trace name for the call to releaseToOS.
+static inline const char *GetReleaseToOSTraceName(scudo::ReleaseToOS) {
+  return nullptr;
+}
+
+// Create a trace name for the call to releaseToOSMaybe in the primary.
+static inline const char *
+GetPrimaryReleaseToOSMaybeTraceName(scudo::ReleaseToOS) {
+  return nullptr;
+}
+
+static inline const char *GetPrimaryReleaseToOSTraceName(scudo::ReleaseToOS) {
+  return nullptr;
+}
+
+// Create a trace name for the call to releaseToOS in the secondary.
+static inline const char *GetSecondaryReleaseToOSTraceName(scudo::ReleaseToOS) {
+  return nullptr;
+}
+
+// Create a trace name for the call to releaseOlderThan in the secondary.
+static inline const char *GetSecondaryReleaseOlderThan() { return nullptr; }
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fabio-d wrote:

nit: I think you meant `GetSecondaryReleaseOlderThanTraceName` (should we put all trace names in a dedicated `namespace`?)

https://github.com/llvm/llvm-project/pull/156112