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      1 //===- Error.cpp - system_error extensions for Object -----------*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This defines a new error_category for the Object library.
     10 //
     11 //===----------------------------------------------------------------------===//
     12 
     13 #include "llvm/Object/Error.h"
     14 #include "llvm/ADT/Twine.h"
     15 #include "llvm/Support/ErrorHandling.h"
     16 #include "llvm/Support/ManagedStatic.h"
     17 
     18 using namespace llvm;
     19 using namespace object;
     20 
     21 namespace {
     22 // FIXME: This class is only here to support the transition to llvm::Error. It
     23 // will be removed once this transition is complete. Clients should prefer to
     24 // deal with the Error value directly, rather than converting to error_code.
     25 class _object_error_category : public std::error_category {
     26 public:
     27   const char* name() const noexcept override;
     28   std::string message(int ev) const override;
     29 };
     30 }
     31 
     32 const char *_object_error_category::name() const noexcept {
     33   return "llvm.object";
     34 }
     35 
     36 std::string _object_error_category::message(int EV) const {
     37   object_error E = static_cast<object_error>(EV);
     38   switch (E) {
     39   case object_error::arch_not_found:
     40     return "No object file for requested architecture";
     41   case object_error::invalid_file_type:
     42     return "The file was not recognized as a valid object file";
     43   case object_error::parse_failed:
     44     return "Invalid data was encountered while parsing the file";
     45   case object_error::unexpected_eof:
     46     return "The end of the file was unexpectedly encountered";
     47   case object_error::string_table_non_null_end:
     48     return "String table must end with a null terminator";
     49   case object_error::invalid_section_index:
     50     return "Invalid section index";
     51   case object_error::bitcode_section_not_found:
     52     return "Bitcode section not found in object file";
     53   case object_error::invalid_symbol_index:
     54     return "Invalid symbol index";
     55   }
     56   llvm_unreachable("An enumerator of object_error does not have a message "
     57                    "defined.");
     58 }
     59 
     60 void BinaryError::anchor() {}
     61 char BinaryError::ID = 0;
     62 char GenericBinaryError::ID = 0;
     63 
     64 GenericBinaryError::GenericBinaryError(const Twine &Msg) : Msg(Msg.str()) {}
     65 
     66 GenericBinaryError::GenericBinaryError(const Twine &Msg,
     67                                        object_error ECOverride)
     68     : Msg(Msg.str()) {
     69   setErrorCode(make_error_code(ECOverride));
     70 }
     71 
     72 void GenericBinaryError::log(raw_ostream &OS) const {
     73   OS << Msg;
     74 }
     75 
     76 static ManagedStatic<_object_error_category> error_category;
     77 
     78 const std::error_category &object::object_category() {
     79   return *error_category;
     80 }
     81 
     82 llvm::Error llvm::object::isNotObjectErrorInvalidFileType(llvm::Error Err) {
     83   return handleErrors(std::move(Err), [](std::unique_ptr<ECError> M) -> Error {
     84     // Try to handle 'M'. If successful, return a success value from
     85     // the handler.
     86     if (M->convertToErrorCode() == object_error::invalid_file_type)
     87       return Error::success();
     88 
     89     // We failed to handle 'M' - return it from the handler.
     90     // This value will be passed back from catchErrors and
     91     // wind up in Err2, where it will be returned from this function.
     92     return Error(std::move(M));
     93   });
     94 }
     95