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.

llvm-svn: 204482

1 files changed, 56 insertions, 0 deletions

diff --git a/llvm/lib/ProfileData/InstrProf.cpp b/llvm/lib/ProfileData/InstrProf.cpp
new file mode 100644
index 00000000000..329abf84e6e
--- /dev/null
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@@ -0,0 +1,56 @@
+//=-- InstrProf.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/ProfileData/InstrProf.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+namespace {
+class InstrProfErrorCategoryType : public error_category {
+  const char *name() const override { return "llvm.instrprof"; }
+  std::string message(int IE) const override {
+    instrprof_error::ErrorType E = static_cast<instrprof_error::ErrorType>(IE);
+    switch (E) {
+    case instrprof_error::success:
+      return "Success";
+    case instrprof_error::eof:
+      return "End of File";
+    case instrprof_error::bad_magic:
+      return "Invalid file format (bad magic)";
+    case instrprof_error::unsupported_version:
+      return "Unsupported format version";
+    case instrprof_error::too_large:
+      return "Too much profile data";
+    case instrprof_error::truncated:
+      return "Truncated profile data";
+    case instrprof_error::malformed:
+      return "Malformed profile data";
+    case instrprof_error::unknown_function:
+      return "No profile data available for function";
+    }
+    llvm_unreachable("A value of instrprof_error has no message.");
+  }
+  error_condition default_error_condition(int EV) const {
+    if (EV == instrprof_error::success)
+      return errc::success;
+    return errc::invalid_argument;
+  }
+};
+}
+
+const error_category &llvm::instrprof_category() {
+  static InstrProfErrorCategoryType C;
+  return C;
+}