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.is_displayed()) {
  24     if (print_warning) {
  25       errs() << "WARNING: You're attempting to print out a bitcode file.\n"
  26              << "This is inadvisable as it may cause display problems. If\n"
  27              << "you REALLY want to taste LLVM bitcode first-hand, you\n"
  28              << "can force output with the `-f' option.\n\n";
  29     }
  30     return true;
  31   }
  32   return false;
  33 }
  34
  35 /// FindExecutable - Find a named executable, giving the argv[0] of program
  36 /// being executed. This allows us to find another LLVM tool if it is built in
  37 /// the same directory.  If the executable cannot be found, return an
  38 /// empty string.
  39 /// @brief Find a named executable.
  40 #undef FindExecutable   // needed on windows :(
  41 sys::Path llvm::FindExecutable(const std::string &ExeName,
  42                                const char *Argv0, void *MainAddr) {
  43   // Check the directory that the calling program is in.  We can do
  44   // this if ProgramPath contains at least one / character, indicating that it
  45   // is a relative path to the executable itself.
  46   sys::Path Result = sys::Path::GetMainExecutable(Argv0, MainAddr);
  47   Result.eraseComponent();
  48   if (!Result.isEmpty()) {
  49     Result.appendComponent(ExeName);
  50     if (Result.canExecute())
  51       return Result;
  52   }
  53
  54   return sys::Path();
  55 }