1 //===-- InitLLVM.cpp -----------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Support/InitLLVM.h" 10 #include "llvm/Support/Error.h" 11 #include "llvm/Support/ManagedStatic.h" 12 #include "llvm/Support/PrettyStackTrace.h" 13 #include "llvm/Support/Process.h" 14 #include "llvm/Support/Signals.h" 15 #include <string> 16 17 #ifdef _WIN32 18 #include "llvm/Support/Windows/WindowsSupport.h" 19 #endif 20 21 using namespace llvm; 22 using namespace llvm::sys; 23 24 InitLLVM::InitLLVM(int &Argc, const char **&Argv, 25 bool InstallPipeSignalExitHandler) { 26 if (InstallPipeSignalExitHandler) 27 // The pipe signal handler must be installed before any other handlers are 28 // registered. This is because the Unix \ref RegisterHandlers function does 29 // not perform a sigaction() for SIGPIPE unless a one-shot handler is 30 // present, to allow long-lived processes (like lldb) to fully opt-out of 31 // llvm's SIGPIPE handling and ignore the signal safely. 32 sys::SetOneShotPipeSignalFunction(sys::DefaultOneShotPipeSignalHandler); 33 // Initialize the stack printer after installing the one-shot pipe signal 34 // handler, so we can perform a sigaction() for SIGPIPE on Unix if requested. 35 StackPrinter.emplace(Argc, Argv); 36 sys::PrintStackTraceOnErrorSignal(Argv[0]); 37 install_out_of_memory_new_handler(); 38 39 #ifdef _WIN32 40 // We use UTF-8 as the internal character encoding. On Windows, 41 // arguments passed to main() may not be encoded in UTF-8. In order 42 // to reliably detect encoding of command line arguments, we use an 43 // Windows API to obtain arguments, convert them to UTF-8, and then 44 // write them back to the Argv vector. 45 // 46 // There's probably other way to do the same thing (e.g. using 47 // wmain() instead of main()), but this way seems less intrusive 48 // than that. 49 std::string Banner = std::string(Argv[0]) + ": "; 50 ExitOnError ExitOnErr(Banner); 51 52 ExitOnErr(errorCodeToError(windows::GetCommandLineArguments(Args, Alloc))); 53 54 // GetCommandLineArguments doesn't terminate the vector with a 55 // nullptr. Do it to make it compatible with the real argv. 56 Args.push_back(nullptr); 57 58 Argc = Args.size() - 1; 59 Argv = Args.data(); 60 #endif 61 } 62 63 InitLLVM::~InitLLVM() { llvm_shutdown(); } 64