Port DebugInfoPDB over to using llvm::Error.

Differential Revision: http://reviews.llvm.org/D19940
Reviewed By: rnk

llvm-svn: 268791

1 files changed, 62 insertions, 0 deletions

diff --git a/llvm/lib/DebugInfo/PDB/GenericError.cpp b/llvm/lib/DebugInfo/PDB/GenericError.cpp
new file mode 100644
index 0000000..ca2d65d
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/GenericError.cpp
@@ -0,0 +1,62 @@
+//===- Error.cpp - system_error extensions for PDB --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/GenericError.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+
+using namespace llvm;
+using namespace llvm::pdb;
+
+class GenericErrorCategory : public std::error_category {
+public:
+  const char *name() const LLVM_NOEXCEPT override { return "llvm.pdb"; }
+
+  std::string message(int Condition) const override {
+    switch (static_cast<generic_error_code>(Condition)) {
+    case generic_error_code::unspecified:
+      return "An unknown error has occurred.";
+    case generic_error_code::dia_sdk_not_present:
+      return "LLVM was not compiled with support for DIA.  This usually means "
+             "that you are are not using MSVC, or your Visual Studio "
+             "installation "
+             "is corrupt.";
+    case generic_error_code::invalid_path:
+      return "Unable to load PDB.  Make sure the file exists and is readable.";
+    }
+    llvm_unreachable("Unrecognized generic_error_code");
+  }
+};
+
+static ManagedStatic<GenericErrorCategory> Category;
+
+char GenericError::ID = 0;
+
+GenericError::GenericError(generic_error_code C) : GenericError(C, "") {}
+
+GenericError::GenericError(const std::string &Context)
+    : GenericError(generic_error_code::unspecified, Context) {}
+
+GenericError::GenericError(generic_error_code C, const std::string &Context)
+    : Code(C) {
+  ErrMsg = "PDB Error: ";
+  std::error_code EC = convertToErrorCode();
+  if (Code != generic_error_code::unspecified)
+    ErrMsg += EC.message() + "  ";
+  if (!Context.empty())
+    ErrMsg += Context;
+}
+
+void GenericError::log(raw_ostream &OS) const { OS << ErrMsg << "\n"; }
+
+const std::string &GenericError::getErrorMessage() const { return ErrMsg; }
+
+std::error_code GenericError::convertToErrorCode() const {
+  return std::error_code(static_cast<int>(Code), *Category);
+}