Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/lib/DebugInfo/PDB/DIA/DIAError.cpp

@@ -0,0 +1,58 @@
+#include "llvm/DebugInfo/PDB/DIA/DIAError.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+
+using namespace llvm;
+using namespace llvm::pdb;
+
+// FIXME: This class is only here to support the transition to llvm::Error. It
+// will be removed once this transition is complete. Clients should prefer to
+// deal with the Error value directly, rather than converting to error_code.
+class DIAErrorCategory : public std::error_category {
+public:
+  const char *name() const noexcept override { return "llvm.pdb.dia"; }
+
+  std::string message(int Condition) const override {
+    switch (static_cast<dia_error_code>(Condition)) {
+    case dia_error_code::could_not_create_impl:
+      return "Failed to connect to DIA at runtime.  Verify that Visual Studio "
+             "is properly installed, or that msdiaXX.dll is in your PATH.";
+    case dia_error_code::invalid_file_format:
+      return "Unable to load PDB.  The file has an unrecognized format.";
+    case dia_error_code::invalid_parameter:
+      return "The parameter is incorrect.";
+    case dia_error_code::already_loaded:
+      return "Unable to load the PDB or EXE, because it is already loaded.";
+    case dia_error_code::debug_info_mismatch:
+      return "The PDB file and the EXE file do not match.";
+    case dia_error_code::unspecified:
+      return "An unknown error has occurred.";
+    }
+    llvm_unreachable("Unrecognized DIAErrorCode");
+  }
+};
+
+static ManagedStatic<DIAErrorCategory> Category;
+
+char DIAError::ID = 0;
+
+DIAError::DIAError(dia_error_code C) : DIAError(C, "") {}
+
+DIAError::DIAError(StringRef Context)
+    : DIAError(dia_error_code::unspecified, Context) {}
+
+DIAError::DIAError(dia_error_code C, StringRef Context) : Code(C) {
+  ErrMsg = "DIA Error: ";
+  std::error_code EC = convertToErrorCode();
+  ErrMsg += EC.message() + "  ";
+  if (!Context.empty())
+    ErrMsg += Context;
+}
+
+void DIAError::log(raw_ostream &OS) const { OS << ErrMsg << "\n"; }
+
+StringRef DIAError::getErrorMessage() const { return ErrMsg; }
+
+std::error_code DIAError::convertToErrorCode() const {
+  return std::error_code(static_cast<int>(Code), *Category);
+}