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      1 //===- Error.cpp - system_error extensions for PDB --------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #include "llvm/DebugInfo/PDB/GenericError.h"
     11 #include "llvm/Support/ErrorHandling.h"
     12 #include "llvm/Support/ManagedStatic.h"
     13 
     14 using namespace llvm;
     15 using namespace llvm::pdb;
     16 
     17 namespace {
     18 // FIXME: This class is only here to support the transition to llvm::Error. It
     19 // will be removed once this transition is complete. Clients should prefer to
     20 // deal with the Error value directly, rather than converting to error_code.
     21 class GenericErrorCategory : public std::error_category {
     22 public:
     23   const char *name() const LLVM_NOEXCEPT override { return "llvm.pdb"; }
     24 
     25   std::string message(int Condition) const override {
     26     switch (static_cast<generic_error_code>(Condition)) {
     27     case generic_error_code::unspecified:
     28       return "An unknown error has occurred.";
     29     case generic_error_code::dia_sdk_not_present:
     30       return "LLVM was not compiled with support for DIA.  This usually means "
     31              "that you are are not using MSVC, or your Visual Studio "
     32              "installation "
     33              "is corrupt.";
     34     case generic_error_code::invalid_path:
     35       return "Unable to load PDB.  Make sure the file exists and is readable.";
     36     }
     37     llvm_unreachable("Unrecognized generic_error_code");
     38   }
     39 };
     40 } // end anonymous namespace
     41 
     42 static ManagedStatic<GenericErrorCategory> Category;
     43 
     44 char GenericError::ID = 0;
     45 
     46 GenericError::GenericError(generic_error_code C) : GenericError(C, "") {}
     47 
     48 GenericError::GenericError(const std::string &Context)
     49     : GenericError(generic_error_code::unspecified, Context) {}
     50 
     51 GenericError::GenericError(generic_error_code C, const std::string &Context)
     52     : Code(C) {
     53   ErrMsg = "PDB Error: ";
     54   std::error_code EC = convertToErrorCode();
     55   if (Code != generic_error_code::unspecified)
     56     ErrMsg += EC.message() + "  ";
     57   if (!Context.empty())
     58     ErrMsg += Context;
     59 }
     60 
     61 void GenericError::log(raw_ostream &OS) const { OS << ErrMsg << "\n"; }
     62 
     63 const std::string &GenericError::getErrorMessage() const { return ErrMsg; }
     64 
     65 std::error_code GenericError::convertToErrorCode() const {
     66   return std::error_code(static_cast<int>(Code), *Category);
     67 }
     68