171 lines
7.3 KiB
C++
171 lines
7.3 KiB
C++
//===- llvm/Support/Signals.h - Signal Handling support ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines some helpful functions for dealing with the possibility of
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// unix signals occurring while your program is running.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_SIGNALS_H
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#define LLVM_SUPPORT_SIGNALS_H
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Support/Compiler.h"
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#include <cstdint>
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#include <string>
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#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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// Typedefs that are convenient but only used by the stack-trace-collection code
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// added if DebugLoc origin-tracking is enabled.
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using AddressSet = DenseSet<void *>;
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using SymbolizedAddressMap = DenseMap<void *, SmallVector<std::string, 0>>;
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} // namespace llvm
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#endif
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namespace llvm {
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class StringRef;
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class raw_ostream;
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namespace sys {
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/// This function runs all the registered interrupt handlers, including the
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/// removal of files registered by RemoveFileOnSignal.
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LLVM_ABI void RunInterruptHandlers();
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/// This function registers signal handlers to ensure that if a signal gets
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/// delivered that the named file is removed.
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/// Remove a file if a fatal signal occurs.
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LLVM_ABI bool RemoveFileOnSignal(StringRef Filename,
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std::string *ErrMsg = nullptr);
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/// This function removes a file from the list of files to be removed on
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/// signal delivery.
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LLVM_ABI void DontRemoveFileOnSignal(StringRef Filename);
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/// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
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/// process, print a stack trace and then exit.
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/// Print a stack trace if a fatal signal occurs.
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/// \param Argv0 the current binary name, used to find the symbolizer
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/// relative to the current binary before searching $PATH; can be
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/// StringRef(), in which case we will only search $PATH.
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/// \param DisableCrashReporting if \c true, disable the normal crash
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/// reporting mechanisms on the underlying operating system.
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LLVM_ABI void PrintStackTraceOnErrorSignal(StringRef Argv0,
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bool DisableCrashReporting = false);
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/// Disable all system dialog boxes that appear when the process crashes.
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LLVM_ABI void DisableSystemDialogsOnCrash();
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/// Print the stack trace using the given \c raw_ostream object.
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/// \param Depth refers to the number of stackframes to print. If not
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/// specified, the entire frame is printed.
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LLVM_ABI void PrintStackTrace(raw_ostream &OS, int Depth = 0);
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#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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#ifdef NDEBUG
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#error DebugLoc origin-tracking should not be enabled in Release builds.
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#endif
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/// Populates the given array with a stack trace of the current program, up to
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/// MaxDepth frames. Returns the number of frames returned, which will be
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/// inserted into \p StackTrace from index 0. All entries after the returned
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/// depth will be unmodified. NB: This is only intended to be used for
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/// introspection of LLVM by Debugify, will not be enabled in release builds,
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/// and should not be relied on for other purposes.
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template <unsigned long MaxDepth>
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int getStackTrace(std::array<void *, MaxDepth> &StackTrace);
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/// Takes a set of \p Addresses, symbolizes them and stores the result in the
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/// provided \p SymbolizedAddresses map.
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/// NB: This is only intended to be used for introspection of LLVM by
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/// Debugify, will not be enabled in release builds, and should not be relied
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/// on for other purposes.
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void symbolizeAddresses(AddressSet &Addresses,
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SymbolizedAddressMap &SymbolizedAddresses);
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#endif
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// Run all registered signal handlers.
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LLVM_ABI void RunSignalHandlers();
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using SignalHandlerCallback = void (*)(void *);
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/// Add a function to be called when an abort/kill signal is delivered to the
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/// process. The handler can have a cookie passed to it to identify what
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/// instance of the handler it is. The NeedsPOSIXUtilitySignalHandling
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/// argument indicates whether POSIX signal handling semantics are followed,
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/// so that the signal handler resignals itself to terminate after handling
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/// the signal.
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LLVM_ABI void AddSignalHandler(SignalHandlerCallback FnPtr, void *Cookie,
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bool NeedsPOSIXUtilitySignalHandling = false);
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/// This function registers a function to be called when the user "interrupts"
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/// the program (typically by pressing ctrl-c). When the user interrupts the
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/// program, the specified interrupt function is called instead of the program
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/// being killed, and the interrupt function automatically disabled.
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///
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/// Note that interrupt functions are not allowed to call any non-reentrant
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/// functions. An null interrupt function pointer disables the current
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/// installed function. Note also that the handler may be executed on a
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/// different thread on some platforms.
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LLVM_ABI void SetInterruptFunction(void (*IF)());
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/// Registers a function to be called when an "info" signal is delivered to
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/// the process.
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///
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/// On POSIX systems, this will be SIGUSR1; on systems that have it, SIGINFO
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/// will also be used (typically ctrl-t).
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///
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/// Note that signal handlers are not allowed to call any non-reentrant
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/// functions. An null function pointer disables the current installed
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/// function. Note also that the handler may be executed on a different
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/// thread on some platforms.
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LLVM_ABI void SetInfoSignalFunction(void (*Handler)());
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/// Registers a function to be called in a "one-shot" manner when a pipe
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/// signal is delivered to the process (i.e., on a failed write to a pipe).
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/// After the pipe signal is handled once, the handler is unregistered.
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///
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/// The LLVM signal handling code will not install any handler for the pipe
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/// signal unless one is provided with this API (see \ref
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/// DefaultOneShotPipeSignalHandler). This handler must be provided before
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/// any other LLVM signal handlers are installed: the \ref InitLLVM
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/// constructor has a flag that can simplify this setup.
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///
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/// Note that the handler is not allowed to call any non-reentrant
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/// functions. A null handler pointer disables the current installed
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/// function. Note also that the handler may be executed on a
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/// different thread on some platforms.
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LLVM_ABI void SetOneShotPipeSignalFunction(void (*Handler)());
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/// On Unix systems and Windows, this function exits with an "IO error" exit
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/// code.
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LLVM_ABI void DefaultOneShotPipeSignalHandler();
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#ifdef _WIN32
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/// Windows does not support signals and this handler must be called manually.
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LLVM_ABI void CallOneShotPipeSignalHandler();
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#endif
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/// This function does the following:
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/// - clean up any temporary files registered with RemoveFileOnSignal()
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/// - dump the callstack from the exception context
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/// - call any relevant interrupt/signal handlers
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/// - create a core/mini dump of the exception context whenever possible
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/// Context is a system-specific failure context: it is the signal type on
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/// Unix; the ExceptionContext on Windows.
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LLVM_ABI void CleanupOnSignal(uintptr_t Context);
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LLVM_ABI void unregisterHandlers();
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} // namespace sys
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} // namespace llvm
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#endif
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