X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FSystemUtils.cpp;h=2036364dc51d99a58e02615b5a8261bdf809be99;hb=b9536ac581d0d74b29c11dcb33e22200b22b86b1;hp=ec0bcb3296e0c5937de442226577b9f3c719fd57;hpb=794a58ed197f082c96a1ea33fdb9c6d0a8f151d8;p=oota-llvm.git diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp index ec0bcb3296e..2036364dc51 100644 --- a/lib/Support/SystemUtils.cpp +++ b/lib/Support/SystemUtils.cpp @@ -1,192 +1,33 @@ -//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===// +//===- SystemUtils.cpp - Utilities for low-level system tasks -------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// // // This file contains functions used to do a variety of low-level, often // system-specific, tasks. // //===----------------------------------------------------------------------===// -#include "SystemUtils.h" -#include -#include -#include -#include -#include "Config/sys/types.h" -#include "Config/sys/stat.h" -#include "Config/fcntl.h" -#include "Config/sys/wait.h" -#include "Config/unistd.h" -#include "Config/errno.h" - -/// removeFile - Delete the specified file -/// -void removeFile(const std::string &Filename) { - std::remove(Filename.c_str()); -} - -/// getUniqueFilename - Return a filename with the specified prefix. If the -/// file does not exist yet, return it, otherwise add a suffix to make it -/// unique. -/// -std::string getUniqueFilename(const std::string &FilenameBase) { - if (!std::ifstream(FilenameBase.c_str())) - return FilenameBase; // Couldn't open the file? Use it! - - // Create a pattern for mkstemp... - char *FNBuffer = new char[FilenameBase.size()+8]; - strcpy(FNBuffer, FilenameBase.c_str()); - strcpy(FNBuffer+FilenameBase.size(), "-XXXXXX"); - - // Agree on a temporary file name to use.... - int TempFD; - if ((TempFD = mkstemp(FNBuffer)) == -1) { - std::cerr << "bugpoint: ERROR: Cannot create temporary file in the current " - << " directory!\n"; - exit(1); - } - - // We don't need to hold the temp file descriptor... we will trust that noone - // will overwrite/delete the file while we are working on it... - close(TempFD); - std::string Result(FNBuffer); - delete[] FNBuffer; - return Result; -} - -/// isExecutableFile - This function returns true if the filename specified -/// exists and is executable. -/// -bool isExecutableFile(const std::string &ExeFileName) { - struct stat Buf; - if (stat(ExeFileName.c_str(), &Buf)) - return false; // Must not be executable! - - if (!(Buf.st_mode & S_IFREG)) - return false; // Not a regular file? - - if (Buf.st_uid == getuid()) // Owner of file? - return Buf.st_mode & S_IXUSR; - else if (Buf.st_gid == getgid()) // In group of file? - return Buf.st_mode & S_IXGRP; - else // Unrelated to file? - return Buf.st_mode & S_IXOTH; -} - - -// FindExecutable - Find a named executable, giving the argv[0] of bugpoint. -// This assumes the executable is in the same directory as bugpoint itself. -// If the executable cannot be found, return an empty string. -// -std::string FindExecutable(const std::string &ExeName, - const std::string &BugPointPath) { - // First check the directory that bugpoint is in. We can do this if - // BugPointPath contains at least one / character, indicating that it is a - // relative path to bugpoint itself. - // - std::string Result = BugPointPath; - while (!Result.empty() && Result[Result.size()-1] != '/') - Result.erase(Result.size()-1, 1); - - if (!Result.empty()) { - Result += ExeName; - if (isExecutableFile(Result)) return Result; // Found it? - } - - // Okay, if the path to bugpoint didn't tell us anything, try using the PATH - // environment variable. - const char *PathStr = getenv("PATH"); - if (PathStr == 0) return ""; - - // Now we have a colon separated list of directories to search... try them... - unsigned PathLen = strlen(PathStr); - while (PathLen) { - // Find the first colon... - const char *Colon = std::find(PathStr, PathStr+PathLen, ':'); - - // Check to see if this first directory contains the executable... - std::string FilePath = std::string(PathStr, Colon) + '/' + ExeName; - if (isExecutableFile(FilePath)) - return FilePath; // Found the executable! - - // Nope it wasn't in this directory, check the next range! - PathLen -= Colon-PathStr; - PathStr = Colon; - while (*PathStr == ':') { // Advance past colons - PathStr++; - PathLen--; - } - } - - // If we fell out, we ran out of directories in PATH to search, return failure - return ""; -} - -static void RedirectFD(const std::string &File, int FD) { - if (File.empty()) return; // Noop - - // Open the file - int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666); - if (InFD == -1) { - std::cerr << "Error opening file '" << File << "' for " - << (FD == 0 ? "input" : "output") << "!\n"; - exit(1); - } - - dup2(InFD, FD); // Install it as the requested FD - close(InFD); // Close the original FD -} - -/// RunProgramWithTimeout - This function executes the specified program, with -/// the specified null-terminated argument array, with the stdin/out/err fd's -/// redirected, with a timeout specified on the commandline. This terminates -/// the calling program if there is an error executing the specified program. -/// It returns the return value of the program, or -1 if a timeout is detected. -/// -int RunProgramWithTimeout(const std::string &ProgramPath, const char **Args, - const std::string &StdInFile, - const std::string &StdOutFile, - const std::string &StdErrFile) { - - // FIXME: install sigalarm handler here for timeout... - - int Child = fork(); - switch (Child) { - case -1: - std::cerr << "ERROR forking!\n"; - exit(1); - case 0: // Child - RedirectFD(StdInFile, 0); // Redirect file descriptors... - RedirectFD(StdOutFile, 1); - RedirectFD(StdErrFile, 2); - - execv(ProgramPath.c_str(), (char *const *)Args); - std::cerr << "Error executing program '" << ProgramPath; - for (; *Args; ++Args) - std::cerr << " " << *Args; - exit(1); - - default: break; - } - - // Make sure all output has been written while waiting - std::cout << std::flush; - - int Status; - if (wait(&Status) != Child) { - if (errno == EINTR) { - static bool FirstTimeout = true; - if (FirstTimeout) { - std::cout << - "*** Program execution timed out! This mechanism is designed to handle\n" - " programs stuck in infinite loops gracefully. The -timeout option\n" - " can be used to change the timeout threshold or disable it completely\n" - " (with -timeout=0). This message is only displayed once.\n"; - FirstTimeout = false; - } - return -1; // Timeout detected +#include "llvm/Support/SystemUtils.h" +#include "llvm/Support/Process.h" +#include "llvm/Support/Program.h" +#include "llvm/Support/raw_ostream.h" +using namespace llvm; + +bool llvm::CheckBitcodeOutputToConsole(raw_ostream &stream_to_check, + bool print_warning) { + if (stream_to_check.is_displayed()) { + if (print_warning) { + errs() << "WARNING: You're attempting to print out a bitcode file.\n" + "This is inadvisable as it may cause display problems. If\n" + "you REALLY want to taste LLVM bitcode first-hand, you\n" + "can force output with the `-f' option.\n\n"; } - - std::cerr << "Error waiting for child process!\n"; - exit(1); + return true; } - return Status; + return false; }