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0739140b05
I expose the API with some caveats: - The C++ API involves a traditional void* opaque pointer for the fatal error callback. The C API doesn’t do this. I don’t think that the void* opaque pointer makes any sense since this is a global callback - there will only be one of them. So if you need to pass some data to your callback, just put it in a global variable. - The bindings will ignore the gen_crash_diag boolean. I ignore it because (1) I don’t know what it does, (2) it’s not documented AFAIK, and (3) I couldn’t imagine any use for it. I made the gut call that it probably wasn’t important enough to expose through the C API. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192864 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
//===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
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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 fatal error conditions. Non-fatal
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// errors (most of them) should be handled through LLVMContext.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/Threading.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm-c/Core.h"
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#include <cassert>
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#include <cstdlib>
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#if defined(HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#if defined(_MSC_VER)
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# include <io.h>
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# include <fcntl.h>
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#endif
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using namespace llvm;
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static fatal_error_handler_t ErrorHandler = 0;
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static void *ErrorHandlerUserData = 0;
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void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
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void *user_data) {
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assert(!llvm_is_multithreaded() &&
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"Cannot register error handlers after starting multithreaded mode!\n");
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assert(!ErrorHandler && "Error handler already registered!\n");
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ErrorHandler = handler;
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ErrorHandlerUserData = user_data;
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}
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void llvm::remove_fatal_error_handler() {
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ErrorHandler = 0;
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}
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void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
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report_fatal_error(Twine(Reason), GenCrashDiag);
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}
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void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
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report_fatal_error(Twine(Reason), GenCrashDiag);
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}
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void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
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report_fatal_error(Twine(Reason), GenCrashDiag);
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}
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void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
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if (ErrorHandler) {
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ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
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} else {
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// Blast the result out to stderr. We don't try hard to make sure this
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// succeeds (e.g. handling EINTR) and we can't use errs() here because
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// raw ostreams can call report_fatal_error.
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SmallVector<char, 64> Buffer;
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raw_svector_ostream OS(Buffer);
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OS << "LLVM ERROR: " << Reason << "\n";
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StringRef MessageStr = OS.str();
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ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
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(void)written; // If something went wrong, we deliberately just give up.
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}
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// If we reached here, we are failing ungracefully. Run the interrupt handlers
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// to make sure any special cleanups get done, in particular that we remove
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// files registered with RemoveFileOnSignal.
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sys::RunInterruptHandlers();
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exit(1);
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}
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void llvm::llvm_unreachable_internal(const char *msg, const char *file,
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unsigned line) {
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// This code intentionally doesn't call the ErrorHandler callback, because
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// llvm_unreachable is intended to be used to indicate "impossible"
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// situations, and not legitimate runtime errors.
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if (msg)
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dbgs() << msg << "\n";
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dbgs() << "UNREACHABLE executed";
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if (file)
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dbgs() << " at " << file << ":" << line;
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dbgs() << "!\n";
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abort();
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#ifdef LLVM_BUILTIN_UNREACHABLE
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// Windows systems and possibly others don't declare abort() to be noreturn,
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// so use the unreachable builtin to avoid a Clang self-host warning.
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LLVM_BUILTIN_UNREACHABLE;
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#endif
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}
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static void bindingsErrorHandler(void *user_data, const std::string& reason,
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bool gen_crash_diag) {
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LLVMFatalErrorHandler handler =
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reinterpret_cast<LLVMFatalErrorHandler>(user_data);
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handler(reason.c_str());
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}
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void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
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install_fatal_error_handler(
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bindingsErrorHandler, reinterpret_cast<void*>(Handler));
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}
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void LLVMResetFatalErrorHandler() {
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remove_fatal_error_handler();
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}
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