-//===- 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 "Support/SystemUtils.h"
-#include <algorithm>
-#include <fstream>
-#include <iostream>
-#include <cstdlib>
-#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"
-
-/// 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 program
-/// being executed. This allows us to find another LLVM tool if it is built into
-/// the same directory, but that directory is neither the current directory, nor
-/// in the PATH. If the executable cannot be found, return an empty string.
-///
-std::string FindExecutable(const std::string &ExeName,
- const std::string &ProgramPath) {
- // 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 = ProgramPath;
- 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 the program 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 command line. 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;
}
-
-//
-// Function: ExecWait ()
-//
-// Description:
-// This function executes a program with the specified arguments and
-// environment. It then waits for the progarm to termiante and then returns
-// to the caller.
-//
-// Inputs:
-// argv - The arguments to the program as an array of C strings. The first
-// argument should be the name of the program to execute, and the
-// last argument should be a pointer to NULL.
-//
-// envp - The environment passes to the program as an array of C strings in
-// the form of "name=value" pairs. The last element should be a
-// pointer to NULL.
-//
-// Outputs:
-// None.
-//
-// Return value:
-// 0 - No errors.
-// 1 - The program could not be executed.
-// 1 - The program returned a non-zero exit status.
-// 1 - The program terminated abnormally.
-//
-// Notes:
-// The program will inherit the stdin, stdout, and stderr file descriptors
-// as well as other various configuration settings (umask).
-//
-// This function should not print anything to stdout/stderr on its own. It is
-// a generic library function. The caller or executed program should report
-// errors in the way it sees fit.
-//
-int
-ExecWait (char ** argv, char **envp)
-{
- // Child process ID
- register int child;
-
- // Status from child process when it exits
- int status;
-
- //
- // Because UNIX is sometimes less than convenient, we need to use
- // FindExecutable() to find the full pathname to the file to execute.
- //
- // This is becausse execvp() doesn't use PATH, and we want to look for
- // programs in the LLVM binary directory first anyway.
- //
- std::string Program = FindExecutable (argv[0], "");
- if (Program.empty())
- {
- return 1;
- }
-
- //
- // Create a child process.
- //
- switch (child=fork())
- {
- case -1:
- return 1;
- break;
-
- case 0:
- execve (Program.c_str(), argv, envp);
- return 1;
- break;
-
- default:
- break;
- }
-
- //
- // Parent process: Wait for the child process to termiante.
- //
- if ((wait (&status)) == -1)
- {
- return 1;
- }
-
- //
- // If the program exited normally with a zero exit status, return success!
- //
- if (WIFEXITED (status) && (WEXITSTATUS(status) == 0))
- {
- return 0;
- }
-
- //
- // Otherwise, return failure.
- //
- return 1;
+/// PrependMainExecutablePath - Prepend the path to the program being executed
+/// to \p ExeName, given the value of argv[0] and the address of main()
+/// itself. This allows us to find another LLVM tool if it is built in the same
+/// directory. An empty string is returned on error; note that this function
+/// just mainpulates the path and doesn't check for executability.
+/// @brief Find a named executable.
+sys::Path llvm::PrependMainExecutablePath(const std::string &ExeName,
+ const char *Argv0, void *MainAddr) {
+ // Check the directory that the calling program is in. We can do
+ // this if ProgramPath contains at least one / character, indicating that it
+ // is a relative path to the executable itself.
+ sys::Path Result = sys::Path::GetMainExecutable(Argv0, MainAddr);
+ Result.eraseComponent();
+
+ if (!Result.isEmpty()) {
+ Result.appendComponent(ExeName);
+ Result.appendSuffix(sys::Path::GetEXESuffix());
+ }
+
+ return Result;
}
-
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