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:
name() const23   const char *name() const LLVM_NOEXCEPT override { return "llvm.pdb"; }
24 
message(int Condition) const25   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 
GenericError(generic_error_code C)46 GenericError::GenericError(generic_error_code C) : GenericError(C, "") {}
47 
GenericError(const std::string & Context)48 GenericError::GenericError(const std::string &Context)
49     : GenericError(generic_error_code::unspecified, Context) {}
50 
GenericError(generic_error_code C,const std::string & Context)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 
log(raw_ostream & OS) const61 void GenericError::log(raw_ostream &OS) const { OS << ErrMsg << "\n"; }
62 
getErrorMessage() const63 const std::string &GenericError::getErrorMessage() const { return ErrMsg; }
64 
convertToErrorCode() const65 std::error_code GenericError::convertToErrorCode() const {
66   return std::error_code(static_cast<int>(Code), *Category);
67 }
68