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//===-- InitLLVM.cpp -----------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/InitLLVM.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/AutoConvert.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Signals.h"
#ifdef _WIN32
#include "llvm/Support/Windows/WindowsSupport.h"
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#else
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
#endif
void CleanupStdHandles(void *Cookie) {
llvm::raw_ostream *Outs = &llvm::outs(), *Errs = &llvm::errs();
Outs->flush();
Errs->flush();
llvm::restoreStdHandleAutoConversion(STDIN_FILENO);
llvm::restoreStdHandleAutoConversion(STDOUT_FILENO);
llvm::restoreStdHandleAutoConversion(STDERR_FILENO);
}
using namespace llvm;
using namespace llvm::sys;
InitLLVM::InitLLVM(int &Argc, const char **&Argv,
bool InstallPipeSignalExitHandler) {
#ifndef NDEBUG
static std::atomic<bool> Initialized{false};
assert(!Initialized && "InitLLVM was already initialized!");
Initialized = true;
#endif
// Bring stdin/stdout/stderr into a known state.
sys::AddSignalHandler(CleanupStdHandles, nullptr);
if (InstallPipeSignalExitHandler)
// The pipe signal handler must be installed before any other handlers are
// registered. This is because the Unix \ref RegisterHandlers function does
// not perform a sigaction() for SIGPIPE unless a one-shot handler is
// present, to allow long-lived processes (like lldb) to fully opt-out of
// llvm's SIGPIPE handling and ignore the signal safely.
sys::SetOneShotPipeSignalFunction(sys::DefaultOneShotPipeSignalHandler);
// Initialize the stack printer after installing the one-shot pipe signal
// handler, so we can perform a sigaction() for SIGPIPE on Unix if requested.
StackPrinter.emplace(Argc, Argv);
sys::PrintStackTraceOnErrorSignal(Argv[0]);
install_out_of_memory_new_handler();
#ifdef __MVS__
// We use UTF-8 as the internal character encoding. On z/OS, all external
// output is encoded in EBCDIC. In order to be able to read all
// error messages, we turn conversion to EBCDIC on for stderr fd.
std::string Banner = std::string(Argv[0]) + ": ";
ExitOnError ExitOnErr(Banner);
// If turning on conversion for stderr fails then the error message
// may be garbled. There is no solution to this problem.
ExitOnErr(errorCodeToError(llvm::enableAutoConversion(STDERR_FILENO)));
ExitOnErr(errorCodeToError(llvm::enableAutoConversion(STDOUT_FILENO)));
#endif
#ifdef _WIN32
// We use UTF-8 as the internal character encoding. On Windows,
// arguments passed to main() may not be encoded in UTF-8. In order
// to reliably detect encoding of command line arguments, we use an
// Windows API to obtain arguments, convert them to UTF-8, and then
// write them back to the Argv vector.
//
// There's probably other way to do the same thing (e.g. using
// wmain() instead of main()), but this way seems less intrusive
// than that.
std::string Banner = std::string(Argv[0]) + ": ";
ExitOnError ExitOnErr(Banner);
ExitOnErr(errorCodeToError(windows::GetCommandLineArguments(Args, Alloc)));
// GetCommandLineArguments doesn't terminate the vector with a
// nullptr. Do it to make it compatible with the real argv.
Args.push_back(nullptr);
Argc = Args.size() - 1;
Argv = Args.data();
#endif
}
InitLLVM::~InitLLVM() {
CleanupStdHandles(nullptr);
llvm_shutdown();
}
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