include/llvm/Support/InitLLVM.h

   1 //===- InitLLVM.h -----------------------------------------------*- C++ -*-===//
   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 #ifndef LLVM_SUPPORT_LLVM_H
  10 #define LLVM_SUPPORT_LLVM_H
  11
  12 #include "llvm/ADT/SmallVector.h"
  13 #include "llvm/Support/Allocator.h"
  14 #include "llvm/Support/PrettyStackTrace.h"
  15
  16 // The main() functions in typical LLVM tools start with InitLLVM which does
  17 // the following one-time initializations:
  18 //
  19 //  1. Setting up a signal handler so that pretty stack trace is printed out
  20 //     if a process crashes.
  21 //
  22 //  2. Set up the global new-handler which is called when a memory allocation
  23 //     attempt fails.
  24 //
  25 //  3. If running on Windows, obtain command line arguments using a
  26 //     multibyte character-aware API and convert arguments into UTF-8
  27 //     encoding, so that you can assume that command line arguments are
  28 //     always encoded in UTF-8 on any platform.
  29 //
  30 // InitLLVM calls llvm_shutdown() on destruction, which cleans up
  31 // ManagedStatic objects.
  32 namespace llvm {
  33 class InitLLVM {
  34 public:
  35   InitLLVM(int &Argc, const char **&Argv);
  36   InitLLVM(int &Argc, char **&Argv)
  37       : InitLLVM(Argc, const_cast<const char **&>(Argv)) {}
  38
  39   ~InitLLVM();
  40
  41 private:
  42   BumpPtrAllocator Alloc;
  43   SmallVector<const char *, 0> Args;
  44   PrettyStackTraceProgram StackPrinter;
  45 };
  46 } // namespace llvm
  47
  48 #endif