llvm/lib/Support/InitLLVM.cpp

   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(); }