llvm-6502/lib/System/system_error.cpp
Michael J. Spencer fae76d0734 This is the first step in adding sane error handling support to LLVMSystem.
The system API's will be shifted over to returning an error_code, and returning
other return values as out parameters to the function.

Code that needs to check error conditions will use the errc enum values which
are the same as the posix_errno defines (EBADF, E2BIG, etc...), and are
compatable with the error codes in WinError.h due to some magic in system_error.

An example would be:

if (error_code ec = KillEvil("Java")) { // error_code can be converted to bool.
  handle_error(ec);
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119360 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-16 18:31:52 +00:00

122 lines
2.7 KiB
C++

//===---------------------- system_error.cpp ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This was lifted from libc++ and modified for C++03.
//
//===----------------------------------------------------------------------===//
#include "llvm/System/system_error.h"
#include "llvm/System/Errno.h"
#include <string>
#include <cstring>
namespace llvm {
// class error_category
error_category::error_category() {
}
error_category::~error_category() {
}
error_condition
error_category::default_error_condition(int ev) const {
return error_condition(ev, *this);
}
bool
error_category::equivalent(int code, const error_condition& condition) const {
return default_error_condition(code) == condition;
}
bool
error_category::equivalent(const error_code& code, int condition) const {
return *this == code.category() && code.value() == condition;
}
std::string
_do_message::message(int ev) const {
return std::string(sys::StrError(ev));
}
class _generic_error_category : public _do_message {
public:
virtual const char* name() const;
virtual std::string message(int ev) const;
};
const char*
_generic_error_category::name() const {
return "generic";
}
std::string
_generic_error_category::message(int ev) const {
#ifdef ELAST
if (ev > ELAST)
return std::string("unspecified generic_category error");
#endif // ELAST
return _do_message::message(ev);
}
const error_category&
generic_category() {
static _generic_error_category s;
return s;
}
class _system_error_category : public _do_message {
public:
virtual const char* name() const;
virtual std::string message(int ev) const;
virtual error_condition default_error_condition(int ev) const;
};
const char*
_system_error_category::name() const {
return "system";
}
// std::string _system_error_category::message(int ev) const {
// Is in Platform/system_error.inc
// error_condition _system_error_category::default_error_condition(int ev) const
// Is in Platform/system_error.inc
const error_category&
system_category() {
static _system_error_category s;
return s;
}
// error_condition
std::string
error_condition::message() const {
return _cat_->message(_val_);
}
// error_code
std::string
error_code::message() const {
return _cat_->message(_val_);
}
} // end namespace llvm
// Include the truly platform-specific parts of this class.
#if defined(LLVM_ON_UNIX)
#include "Unix/system_error.inc"
#endif
#if defined(LLVM_ON_WIN32)
#include "Win32/system_error.inc"
#endif