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/Streams.h"
  16 #include "llvm/Support/SystemUtils.h"
  17 #include "llvm/System/Process.h"
  18 #include "llvm/System/Program.h"
  19 #include <ostream>
  20 using namespace llvm;
  21
  22 bool llvm::CheckBitcodeOutputToConsole(raw_ostream* stream_to_check,
  23                                        bool print_warning) {
  24   if (stream_to_check == &outs() &&
  25       sys::Process::StandardOutIsDisplayed()) {
  26     if (print_warning) {
  27       cerr << "WARNING: You're attempting to print out a bitcode file.\n"
  28            << "This is inadvisable as it may cause display problems. If\n"
  29            << "you REALLY want to taste LLVM bitcode first-hand, you\n"
  30            << "can force output with the `-f' option.\n\n";
  31     }
  32     return true;
  33   }
  34   return false;
  35 }
  36
  37 bool llvm::CheckBitcodeOutputToConsole(std::ostream* stream_to_check,
  38                                        bool print_warning) {
  39   if (stream_to_check == cout.stream() &&
  40       sys::Process::StandardOutIsDisplayed()) {
  41     if (print_warning) {
  42       cerr << "WARNING: You're attempting to print out a bitcode file.\n"
  43            << "This is inadvisable as it may cause display problems. If\n"
  44            << "you REALLY want to taste LLVM bitcode first-hand, you\n"
  45            << "can force output with the `-f' option.\n\n";
  46     }
  47     return true;
  48   }
  49   return false;
  50 }
  51
  52 /// FindExecutable - Find a named executable, giving the argv[0] of program
  53 /// being executed. This allows us to find another LLVM tool if it is built in
  54 /// the same directory.  If the executable cannot be found, return an
  55 /// empty string.
  56 /// @brief Find a named executable.
  57 #undef FindExecutable   // needed on windows :(
  58 sys::Path llvm::FindExecutable(const std::string &ExeName,
  59                                const char *Argv0, void *MainAddr) {
  60   // Check the directory that the calling program is in.  We can do
  61   // this if ProgramPath contains at least one / character, indicating that it
  62   // is a relative path to the executable itself.
  63   sys::Path Result = sys::Path::GetMainExecutable(Argv0, MainAddr);
  64   Result.eraseComponent();
  65   if (!Result.isEmpty()) {
  66     Result.appendComponent(ExeName);
  67     if (Result.canExecute())
  68       return Result;
  69   }
  70
  71   return sys::Path();
  72 }