ProfileData: Introduce the InstrProfReader interface and a text reader

This introduces the ProfileData library and updates llvm-profdata to
use this library for reading profiles. InstrProfReader is an abstract
base class that will be subclassed for both the raw instrprof data
from compiler-rt and the efficient instrprof format that will be used
for PGO.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204482 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 52 insertions, 0 deletions

diff --git a/include/llvm/ProfileData/InstrProf.h b/include/llvm/ProfileData/InstrProf.h
new file mode 100644
index 0000000000..21cc170065
--- /dev/null
+++ b/include/llvm/ProfileData/InstrProf.h
@@ -0,0 +1,52 @@
+//=-- InstrProf.h - Instrumented profiling format support ---------*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Instrumentation-based profiling data is generated by instrumented
+// binaries through library functions in compiler-rt, and read by the clang
+// frontend to feed PGO.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_PROFILEDATA_INSTRPROF_H__
+#define LLVM_PROFILEDATA_INSTRPROF_H__
+
+#include "llvm/Support/system_error.h"
+
+namespace llvm {
+
+const error_category &instrprof_category();
+
+struct instrprof_error {
+  enum ErrorType {
+    success = 0,
+    eof,
+    bad_magic,
+    unsupported_version,
+    too_large,
+    truncated,
+    malformed,
+    unknown_function
+  };
+  ErrorType V;
+
+  instrprof_error(ErrorType V) : V(V) {}
+  operator ErrorType() const { return V; }
+};
+
+inline error_code make_error_code(instrprof_error E) {
+  return error_code(static_cast<int>(E), instrprof_category());
+}
+
+template <> struct is_error_code_enum<instrprof_error> : std::true_type {};
+template <> struct is_error_code_enum<instrprof_error::ErrorType>
+  : std::true_type {};
+
+} // end namespace llvm
+
+#endif // LLVM_PROFILEDATA_INSTRPROF_H__