[compiler-rt] [XRay] Basic initialization and flag definition for XRay runtime

Summary:
This patch implements the initialisation and patching routines for the XRay runtime, along with the necessary trampolines for function entry/exit handling. For now we only define the basic hooks for allowing an implementation to define a handler that gets run on function entry/exit. We expose a minimal API for controlling the behaviour of the runtime (patching, cleanup, and setting the handler to invoke when instrumenting).

Depends on D19904

Reviewers: echristo, kcc, rnk

Subscribers: rnk, mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D21612

llvm-svn: 276117

1 files changed, 40 insertions, 0 deletions

diff --git a/compiler-rt/lib/xray/xray_interface_internal.h b/compiler-rt/lib/xray/xray_interface_internal.h
new file mode 100644
index 00000000000..b381107f709
--- /dev/null
+++ b/compiler-rt/lib/xray/xray_interface_internal.h
@@ -0,0 +1,40 @@
+//===-- xray_interface_internal.h -------------------------------*- C++ -*-===//
+//
+//                     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 XRay, a dynamic runtime instrumentation system.
+//
+// Implementation of the API functions. See also include/xray/xray_interface.h.
+//
+//===----------------------------------------------------------------------===//
+#ifndef XRAY_INTERFACE_INTERNAL_H
+#define XRAY_INTERFACE_INTERNAL_H
+
+#include "xray/xray_interface.h"
+#include <cstdint>
+
+extern "C" {
+
+struct XRaySledEntry {
+  uint64_t Address;
+  uint64_t Function;
+  unsigned char Kind;
+  unsigned char AlwaysInstrument;
+  unsigned char Padding[14]; // Need 32 bytes
+};
+}
+
+namespace __xray {
+
+struct XRaySledMap {
+  const XRaySledEntry *Sleds;
+  std::size_t Entries;
+};
+}
+
+#endif