Profile: Add a library for the instrumentation based profiling format

This provides a library to work with the instrumentation based
profiling format that is used by clang's -fprofile-instr-* options and
by the llvm-profdata tool. This is a binary format, rather than the
textual one that's currently in use.

The tests are in the subsequent commits that use this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203703 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Profile/ProfileData.cpp

@@ -0,0 +1,54 @@
+//=-- ProfileData.cpp - Instrumented profiling format support ---------------=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for clang's instrumentation based PGO and
+// coverage.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Profile/ProfileData.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+namespace {
+class ProfileDataErrorCategoryType : public _do_message {
+  const char *name() const override { return "llvm.profiledata"; }
+  std::string message(int IE) const {
+    profiledata_error::ErrorType E =
+        static_cast<profiledata_error::ErrorType>(IE);
+    switch (E) {
+    case profiledata_error::success: return "Success";
+    case profiledata_error::bad_magic:
+      return "Invalid file format (bad magic)";
+    case profiledata_error::unsupported_version:
+      return "Unsupported format version";
+    case profiledata_error::too_large:
+      return "Too much profile data";
+    case profiledata_error::truncated:
+      return "Truncated profile data";
+    case profiledata_error::malformed:
+      return "Malformed profile data";
+    case profiledata_error::unknown_function:
+      return "No profile data available for function";
+    }
+    llvm_unreachable("A value of profiledata_error has no message.");
+  }
+  error_condition default_error_condition(int EV) const {
+    if (EV == profiledata_error::success)
+      return errc::success;
+    return errc::invalid_argument;
+  }
+};
+}
+
+const error_category &llvm::profiledata_category() {
+  static ProfileDataErrorCategoryType C;
+  return C;
+}