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583b6dbcc5
error handling mechanisms. Please correct these if I've misunderstood something. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79505 91177308-0d34-0410-b5e6-96231b3b80d8
88 lines
3.5 KiB
C++
88 lines
3.5 KiB
C++
//===- llvm/Support/ErrorHandling.h - Callbacks for errors ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an API used to indicate error conditions.
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// Callbacks can be registered for these errors through this API.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ERRORHANDLING_H
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#define LLVM_SUPPORT_ERRORHANDLING_H
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#include "llvm/Support/Compiler.h"
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#include <string>
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namespace llvm {
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class Twine;
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/// An error handler callback.
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typedef void (*llvm_error_handler_t)(void *user_data,
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const std::string& reason);
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/// llvm_instal_error_handler - Installs a new error handler to be used
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/// whenever a serious (non-recoverable) error is encountered by LLVM.
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///
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/// If you are using llvm_start_multithreaded, you should register the handler
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/// before doing that.
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///
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/// If no error handler is installed the default is to print the error message
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/// to stderr, and call exit(1). If an error handler is installed then it is
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/// the handler's responsibility to log the message, it will no longer be
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/// printed to stderr. If the error handler returns, then exit(1) will be
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/// called.
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///
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/// It is dangerous to naively use an error handler which throws an exception.
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/// Even though some applications desire to gracefully recover from arbitrary
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/// faults, blindly throwing exceptions through unfamiliar code isn't a way to
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/// achieve this.
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///
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/// \param user_data - An argument which will be passed to the install error
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/// handler.
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void llvm_install_error_handler(llvm_error_handler_t handler,
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void *user_data = 0);
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/// Restores default error handling behaviour.
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/// This must not be called between llvm_start_multithreaded() and
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/// llvm_stop_multithreaded().
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void llvm_remove_error_handler();
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/// Reports a serious error, calling any installed error handler. These
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/// functions are intended to be used for error conditions which are outside
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/// the control of the compiler (I/O errors, invalid user input, etc.)
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///
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/// If no error handler is installed the default is to print the message to
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/// standard error, followed by a newline.
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/// After the error handler is called this function will call exit(1), it
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/// does not return.
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void llvm_report_error(const char *reason) NORETURN;
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void llvm_report_error(const std::string &reason) NORETURN;
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void llvm_report_error(const Twine &reason) NORETURN;
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/// This function calls abort(), and prints the optional message to stderr.
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/// Use the llvm_unreachable macro (that adds location info), instead of
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/// calling this function directly.
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void llvm_unreachable_internal(const char *msg=0, const char *file=0,
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unsigned line=0) NORETURN;
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}
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/// Prints the message and location info to stderr in !NDEBUG builds.
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/// This is intended to be used for "impossible" situations that imply
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/// a bug in the compiler.
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///
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/// In NDEBUG mode it only prints "UNREACHABLE executed".
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/// Use this instead of assert(0), so that the compiler knows this path
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/// is not reachable even for NDEBUG builds.
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#ifndef NDEBUG
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#define llvm_unreachable(msg) llvm_unreachable_internal(msg, __FILE__, __LINE__)
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#else
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#define llvm_unreachable(msg) llvm_unreachable_internal()
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#endif
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#endif
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