lib/Support/SystemUtils.cpp

   1 //===- SystemUtils.cpp - Utilities for low-level system tasks -------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains functions used to do a variety of low-level, often
  11 // system-specific, tasks.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Support/SystemUtils.h"
  16 #include "llvm/System/Process.h"
  17 #include "llvm/System/Program.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 using namespace llvm;
  20
  21 bool llvm::CheckBitcodeOutputToConsole(raw_ostream &stream_to_check,
  22                                        bool print_warning) {
  23   if (&stream_to_check == &outs() &&
  24       sys::Process::StandardOutIsDisplayed()) {
  25     if (print_warning) {
  26       errs() << "WARNING: You're attempting to print out a bitcode file.\n"
  27              << "This is inadvisable as it may cause display problems. If\n"
  28              << "you REALLY want to taste LLVM bitcode first-hand, you\n"
  29              << "can force output with the `-f' option.\n\n";
  30     }
  31     return true;
  32   }
  33   return false;
  34 }
  35
  36 /// FindExecutable - Find a named executable, giving the argv[0] of program
  37 /// being executed. This allows us to find another LLVM tool if it is built in
  38 /// the same directory.  If the executable cannot be found, return an
  39 /// empty string.
  40 /// @brief Find a named executable.
  41 #undef FindExecutable   // needed on windows :(
  42 sys::Path llvm::FindExecutable(const std::string &ExeName,
  43                                const char *Argv0, void *MainAddr) {
  44   // Check the directory that the calling program is in.  We can do
  45   // this if ProgramPath contains at least one / character, indicating that it
  46   // is a relative path to the executable itself.
  47   sys::Path Result = sys::Path::GetMainExecutable(Argv0, MainAddr);
  48   Result.eraseComponent();
  49   if (!Result.isEmpty()) {
  50     Result.appendComponent(ExeName);
  51     if (Result.canExecute())
  52       return Result;
  53   }
  54
  55   return sys::Path();
  56 }