SystemUtils.cpp revision 74382b7c699120fbec5cb5603c9cf4212eb37f06 
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"
19using namespace llvm;
20
21bool 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 :(
42sys::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}
57