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//===-- Status.h ------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_UTILITY_STATUS_H
#define LLDB_UTILITY_STATUS_H
#include "lldb/lldb-defines.h"
#include "lldb/lldb-enumerations.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FormatVariadic.h"
#include <cstdarg>
#include <cstdint>
#include <string>
#include <system_error>
#include <type_traits>
namespace llvm {
class raw_ostream;
}
namespace lldb_private {
/// \class Status Status.h "lldb/Utility/Status.h" An error handling class.
///
/// This class is designed to be able to hold any error code that can be
/// encountered on a given platform. The errors are stored as a value of type
/// Status::ValueType. This value should be large enough to hold any and all
/// errors that the class supports. Each error has an associated type that is
/// of type lldb::ErrorType. New types can be added to support new error
/// types, and architecture specific types can be enabled. In the future we
/// may wish to switch to a registration mechanism where new error types can
/// be registered at runtime instead of a hard coded scheme.
///
/// All errors in this class also know how to generate a string representation
/// of themselves for printing results and error codes. The string value will
/// be fetched on demand and its string value will be cached until the error
/// is cleared of the value of the error changes.
class Status {
public:
/// Every error value that this object can contain needs to be able to fit
/// into ValueType.
typedef uint32_t ValueType;
Status();
/// Initialize the error object with a generic success value.
///
/// \param[in] err
/// An error code.
///
/// \param[in] type
/// The type for \a err.
explicit Status(ValueType err,
lldb::ErrorType type = lldb::eErrorTypeGeneric);
Status(std::error_code EC);
explicit Status(const char *format, ...)
__attribute__((format(printf, 2, 3)));
~Status();
// llvm::Error support
explicit Status(llvm::Error error) { *this = std::move(error); }
const Status &operator=(llvm::Error error);
llvm::Error ToError() const;
/// Get the error string associated with the current error.
//
/// Gets the error value as a NULL terminated C string. The error string
/// will be fetched and cached on demand. The error string will be retrieved
/// from a callback that is appropriate for the type of the error and will
/// be cached until the error value is changed or cleared.
///
/// \return
/// The error as a NULL terminated C string value if the error
/// is valid and is able to be converted to a string value,
/// NULL otherwise.
const char *AsCString(const char *default_error_str = "unknown error") const;
/// Clear the object state.
///
/// Reverts the state of this object to contain a generic success value and
/// frees any cached error string value.
void Clear();
/// Test for error condition.
///
/// \return
/// \b true if this object contains an error, \b false
/// otherwise.
bool Fail() const;
/// Access the error value.
///
/// \return
/// The error value.
ValueType GetError() const;
/// Access the error type.
///
/// \return
/// The error type enumeration value.
lldb::ErrorType GetType() const;
/// Set accessor from a kern_return_t.
///
/// Set accessor for the error value to \a err and the error type to \c
/// MachKernel.
///
/// \param[in] err
/// A mach error code.
void SetMachError(uint32_t err);
void SetExpressionError(lldb::ExpressionResults, const char *mssg);
int SetExpressionErrorWithFormat(lldb::ExpressionResults, const char *format,
...) __attribute__((format(printf, 3, 4)));
/// Set accessor with an error value and type.
///
/// Set accessor for the error value to \a err and the error type to \a
/// type.
///
/// \param[in] err
/// A mach error code.
///
/// \param[in] type
/// The type for \a err.
void SetError(ValueType err, lldb::ErrorType type);
/// Set the current error to errno.
///
/// Update the error value to be \c errno and update the type to be \c
/// Status::POSIX.
void SetErrorToErrno();
/// Set the current error to a generic error.
///
/// Update the error value to be \c LLDB_GENERIC_ERROR and update the type
/// to be \c Status::Generic.
void SetErrorToGenericError();
/// Set the current error string to \a err_str.
///
/// Set accessor for the error string value for a generic errors, or to
/// supply additional details above and beyond the standard error strings
/// that the standard type callbacks typically provide. This allows custom
/// strings to be supplied as an error explanation. The error string value
/// will remain until the error value is cleared or a new error value/type
/// is assigned.
///
/// \param err_str
/// The new custom error string to copy and cache.
void SetErrorString(llvm::StringRef err_str);
/// Set the current error string to a formatted error string.
///
/// \param format
/// A printf style format string
int SetErrorStringWithFormat(const char *format, ...)
__attribute__((format(printf, 2, 3)));
int SetErrorStringWithVarArg(const char *format, va_list args);
template <typename... Args>
void SetErrorStringWithFormatv(const char *format, Args &&... args) {
SetErrorString(llvm::formatv(format, std::forward<Args>(args)...).str());
}
/// Test for success condition.
///
/// Returns true if the error code in this object is considered a successful
/// return value.
///
/// \return
/// \b true if this object contains an value that describes
/// success (non-erro), \b false otherwise.
bool Success() const;
protected:
/// Member variables
ValueType m_code = 0; ///< Status code as an integer value.
lldb::ErrorType m_type =
lldb::eErrorTypeInvalid; ///< The type of the above error code.
mutable std::string m_string; ///< A string representation of the error code.
};
} // namespace lldb_private
namespace llvm {
template <> struct format_provider<lldb_private::Status> {
static void format(const lldb_private::Status &error, llvm::raw_ostream &OS,
llvm::StringRef Options);
};
}
#define LLDB_ERRORF(status, fmt, ...) \
do { \
if (status) { \
(status)->SetErrorStringWithFormat((fmt), __VA_ARGS__); \
} \
} while (0);
#endif // LLDB_UTILITY_STATUS_H
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