LLVM API Documentation

SystemUtils.cpp

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00001 //===- SystemUtils.cpp - Utilities for low-level system tasks -------------===//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // This file contains functions used to do a variety of low-level, often
00011 // system-specific, tasks.
00012 //
00013 //===----------------------------------------------------------------------===//
00014 
00015 #include "llvm/Support/SystemUtils.h"
00016 #include "llvm/System/Process.h"
00017 #include "llvm/System/Program.h"
00018 #include <iostream>
00019 using namespace llvm;
00020 
00021 bool llvm::CheckBytecodeOutputToConsole(std::ostream* stream_to_check,
00022                                         bool print_warning) {
00023   if (stream_to_check == &std::cout && sys::Process::StandardOutIsDisplayed()) {
00024     if (print_warning) {
00025       std::cerr << "WARNING: You're attempting to print out a bytecode file.\n"
00026                    "This is inadvisable as it may cause display problems. If\n"
00027                    "you REALLY want to taste LLVM bytecode first-hand, you\n"
00028                    "can force output with the `-f' option.\n\n";
00029     }
00030     return true;
00031   }
00032   return false;
00033 }
00034 
00035 /// FindExecutable - Find a named executable, giving the argv[0] of program
00036 /// being executed. This allows us to find another LLVM tool if it is built
00037 /// into the same directory, but that directory is neither the current
00038 /// directory, nor in the PATH.  If the executable cannot be found, return an
00039 /// empty string.
00040 ///
00041 #undef FindExecutable   // needed on windows :(
00042 sys::Path llvm::FindExecutable(const std::string &ExeName,
00043                                const std::string &ProgramPath) {
00044   // First check the directory that the calling program is in.  We can do this
00045   // if ProgramPath contains at least one / character, indicating that it is a
00046   // relative path to bugpoint itself.
00047   sys::Path Result ( ProgramPath );
00048   Result.eraseComponent();
00049   if (!Result.isEmpty()) {
00050     Result.appendComponent(ExeName);
00051     if (Result.canExecute())
00052       return Result;
00053   }
00054 
00055   return sys::Program::FindProgramByName(ExeName);
00056 }