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#pragma once
#include "bt_exception.h"
#include "strbuf.h"
#include "string.h"
#include "utility.h"
#include "va_args.h"
#include <utility>
#include <util/stream/tempbuf.h>
#include <util/system/compat.h>
#include <util/system/compiler.h>
#include <util/system/defaults.h>
#include <util/system/error.h>
#include <util/system/src_location.h>
#include <util/system/platform.h>
#include <exception>
#include <cstdio>
class TBackTrace;
namespace NPrivateException {
class TTempBufCuttingWrapperOutput: public IOutputStream {
public:
TTempBufCuttingWrapperOutput(TTempBuf& tempbuf)
: TempBuf_(tempbuf)
{
}
void DoWrite(const void* data, size_t len) override {
TempBuf_.Append(data, Min(len, TempBuf_.Left()));
}
private:
TTempBuf& TempBuf_;
};
class yexception: public std::exception {
public:
yexception();
yexception(const yexception&) = default;
yexception(yexception&&) = default;
yexception& operator=(const yexception&) = default;
yexception& operator=(yexception&&) = default;
const char* what() const noexcept override;
virtual const TBackTrace* BackTrace() const noexcept;
template <class T>
inline void Append(const T& t) {
TTempBufCuttingWrapperOutput tempBuf(Buf_);
static_cast<IOutputStream&>(tempBuf) << t;
ZeroTerminate();
}
TStringBuf AsStrBuf() const Y_LIFETIME_BOUND;
private:
void ZeroTerminate() noexcept;
private:
TTempBuf Buf_;
};
template <class E, class T>
static inline std::enable_if_t<std::is_base_of<yexception, std::decay_t<E>>::value, E&&>
operator<<(E&& e Y_LIFETIME_BOUND, const T& t) {
e.Append(t);
return std::forward<E>(e);
}
template <class T>
static inline T&& operator+(const TSourceLocation& sl, T&& t Y_LIFETIME_BOUND) {
return std::forward<T>(t << sl << TStringBuf(": "));
}
}
class yexception: public NPrivateException::yexception {
};
Y_DECLARE_OUT_SPEC(inline, yexception, stream, value) {
stream << value.AsStrBuf();
}
class TSystemError: public yexception {
public:
TSystemError(int status)
: Status_(status)
{
Init();
}
TSystemError()
: TSystemError(LastSystemError())
{
}
int Status() const noexcept {
return Status_;
}
private:
void Init();
private:
int Status_;
};
class TIoException: public TSystemError {
};
class TIoSystemError: public TIoException {
};
class TFileError: public TIoSystemError {
};
/**
* TBadArgumentException should be thrown when an argument supplied to some function (or constructor)
* is invalid or incorrect.
*
* \note
* A special case when such argument is given to a function which performs type casting
* (e.g. integer from string) is covered by the TBadCastException class which is derived from
* TBadArgumentException.
*/
struct TBadArgumentException: public virtual yexception {
};
/**
* TBadCastException should be thrown to indicate the failure of some type casting procedure
* (e.g. reading an integer parameter from string).
*/
struct TBadCastException: public virtual TBadArgumentException {
};
#define ythrow throw __LOCATION__ +
namespace NPrivate {
/// Encapsulates data for one of the most common case in which
/// exception message consists of single constant string
struct TSimpleExceptionMessage {
TSourceLocation Location;
TStringBuf Message;
};
[[noreturn]] void ThrowYException(const TSimpleExceptionMessage& sm);
[[noreturn]] void ThrowYExceptionWithBacktrace(const TSimpleExceptionMessage& sm);
}
void fputs(const std::exception& e, FILE* f = stderr);
TString CurrentExceptionMessage();
/**
* Formats current exception for logging purposes. Includes formatted backtrace if it is stored
* alongside the exception.
* The output format is a subject to change, do not depend or canonize it.
* The speed of this method is not guaranteed either. Do not call it in hot paths of your code.
*
* The lack of current exception prior to the invocation indicates logical bug in the client code.
* Y_ABORT_UNLESS asserts the existence of exception, otherwise panic and abort.
*/
TString FormatCurrentException();
void FormatCurrentExceptionTo(IOutputStream& out);
/*
* A neat method that detects whether stack unwinding is in progress.
* As its std counterpart (that is std::uncaught_exception())
* was removed from the standard, this method uses std::uncaught_exceptions() internally.
*
* If you are struggling to use this method, please, consider reading
*
* http://www.gotw.ca/gotw/047.htm
* and
* http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4152.pdf
*
* DO NOT USE THIS METHOD IN DESTRUCTORS.
*/
bool UncaughtException() noexcept;
std::string CurrentExceptionTypeName();
TString FormatExc(const std::exception& exception);
#define Y_THROW_UNLESS_EX(CONDITION, THROW_EXPRESSION) \
do { \
if (Y_UNLIKELY(!(CONDITION))) { \
ythrow THROW_EXPRESSION; \
} \
} while (false)
#define Y_ENSURE_EX Y_THROW_UNLESS_EX
/// @def Y_ENSURE_SIMPLE
/// This macro works like the Y_ENSURE, but requires the second argument to be a constant string view.
/// Should not be used directly.
#define Y_ENSURE_SIMPLE(CONDITION, MESSAGE, THROW_FUNCTION) \
do { \
if (Y_UNLIKELY(!(CONDITION))) { \
/* use variable to guarantee evaluation at compile time */ \
static constexpr const ::NPrivate::TSimpleExceptionMessage __SIMPLE_EXCEPTION_MESSAGE{__LOCATION__, (MESSAGE)}; \
THROW_FUNCTION(__SIMPLE_EXCEPTION_MESSAGE); \
} \
} while (false)
#define Y_ENSURE_IMPL_1(CONDITION) Y_ENSURE_SIMPLE(CONDITION, ::TStringBuf("Condition violated: `" Y_STRINGIZE(CONDITION) "'"), ::NPrivate::ThrowYException)
#define Y_ENSURE_IMPL_2(CONDITION, MESSAGE) Y_ENSURE_EX(CONDITION, yexception() << MESSAGE)
#define Y_ENSURE_BT_IMPL_1(CONDITION) Y_ENSURE_SIMPLE(CONDITION, ::TStringBuf("Condition violated: `" Y_STRINGIZE(CONDITION) "'"), ::NPrivate::ThrowYExceptionWithBacktrace)
#define Y_ENSURE_BT_IMPL_2(CONDITION, MESSAGE) Y_ENSURE_EX(CONDITION, TWithBackTrace<yexception>() << MESSAGE)
/**
* @def Y_ENSURE
*
* This macro is intended to be used as a shortcut for `if () { throw }`.
*
* @code
* void DoSomethingLovely(const int x, const int y) {
* Y_ENSURE(x > y, "`x` must be greater than `y`");
* Y_ENSURE(x > y); // if you are too lazy
* // actually doing something nice here
* }
* @endcode
*/
#define Y_THROW_UNLESS(...) Y_PASS_VA_ARGS(Y_MACRO_IMPL_DISPATCHER_2(__VA_ARGS__, Y_ENSURE_IMPL_2, Y_ENSURE_IMPL_1)(__VA_ARGS__))
#define Y_ENSURE Y_THROW_UNLESS
/**
* @def Y_ENSURE_BT
*
* This macro is intended to be used as a shortcut for `if () { throw TWithBackTrace<yexception>() << "message"; }`.
*
* @code
* void DoSomethingLovely(const int x, const int y) {
* Y_ENSURE_BT(x > y, "`x` must be greater than `y`");
* Y_ENSURE_BT(x > y); // if you are too lazy
* // actually doing something nice here
* }
* @endcode
*/
#define Y_ENSURE_BT(...) Y_PASS_VA_ARGS(Y_MACRO_IMPL_DISPATCHER_2(__VA_ARGS__, Y_ENSURE_BT_IMPL_2, Y_ENSURE_BT_IMPL_1)(__VA_ARGS__))
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