X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FSystemUtils.cpp;h=2036364dc51d99a58e02615b5a8261bdf809be99;hb=3259d61895c6a2bc88c32df4fe429e2117e9cb5f;hp=f016db2b99d9cd34683df35175bb154f99edeb04;hpb=b48730372594d6a476d0a32c4ce12d963ee3812a;p=oota-llvm.git diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp index f016db2b99d..2036364dc51 100644 --- a/lib/Support/SystemUtils.cpp +++ b/lib/Support/SystemUtils.cpp @@ -1,10 +1,10 @@ -//===- SystemUtils.h - Utilities to do low-level system stuff --*- C++ -*--===// -// +//===- SystemUtils.cpp - Utilities for low-level system tasks -------------===// +// // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. -// +// 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 @@ -12,317 +12,22 @@ // //===----------------------------------------------------------------------===// -#define _POSIX_MAPPED_FILES -#include "Support/SystemUtils.h" -#include "Config/sys/types.h" -#include "Config/sys/stat.h" -#include "Config/fcntl.h" -#include "Config/pagesize.h" -#include "Config/sys/wait.h" -#include "Config/sys/mman.h" -#include "Config/unistd.h" -#include -#include -#include -#include -#include -#include "Config/windows.h" +#include "llvm/Support/SystemUtils.h" +#include "llvm/Support/Process.h" +#include "llvm/Support/Program.h" +#include "llvm/Support/raw_ostream.h" using namespace llvm; -/// isExecutableFile - This function returns true if the filename specified -/// exists and is executable. -/// -bool llvm::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; -} - -/// isStandardOutAConsole - Return true if we can tell that the standard output -/// stream goes to a terminal window or console. -bool llvm::isStandardOutAConsole() { -#if HAVE_ISATTY - return isatty(1); -#endif - // If we don't have isatty, just return false. - return false; -} - - -/// 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. -/// -#undef FindExecutable // needed on windows :( -std::string llvm::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 llvm::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... - -#ifdef HAVE_SYS_WAIT_H - 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); - if (StdOutFile != StdErrFile) - RedirectFD(StdErrFile, 2); - else - dup2(1, 2); - - execv(ProgramPath.c_str(), (char *const *)Args); - std::cerr << "Error executing program: '" << ProgramPath; - for (; *Args; ++Args) - std::cerr << " " << *Args; - std::cerr << "'\n"; - 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 +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; - -#else - std::cerr << "RunProgramWithTimeout not implemented on this platform!\n"; - return -1; -#endif -} - - -// ExecWait - 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. -// -// This function does not use $PATH to find programs. -// -int llvm::ExecWait(const char * const old_argv[], - const char * const old_envp[]) { -#ifdef HAVE_SYS_WAIT_H - // Create local versions of the parameters that can be passed into execve() - // without creating const problems. - char ** const argv = (char ** const) old_argv; - char ** const envp = (char ** const) old_envp; - - // Create a child process. - switch (fork()) { - // An error occured: Return to the caller. - case -1: - return 1; - break; - - // Child process: Execute the program. - case 0: - execve (argv[0], argv, envp); - // If the execve() failed, we should exit and let the parent pick up - // our non-zero exit status. - exit (1); - - // Parent process: Break out of the switch to do our processing. - default: - break; - } - - // Parent process: Wait for the child process to terminate. - int status; - 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; -#else - std::cerr << "llvm::ExecWait not implemented on this platform!\n"; -#endif - - // Otherwise, return failure. - return 1; -} - -/// AllocateRWXMemory - Allocate a slab of memory with read/write/execute -/// permissions. This is typically used for JIT applications where we want -/// to emit code to the memory then jump to it. Getting this type of memory -/// is very OS specific. -/// -void *llvm::AllocateRWXMemory(unsigned NumBytes) { - if (NumBytes == 0) return 0; - -#if defined(HAVE_WINDOWS_H) - // On windows we use VirtualAlloc. - void *P = VirtualAlloc(0, NumBytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE); - if (P == 0) { - std::cerr << "Error allocating executable memory!\n"; - abort(); - } - return P; - -#elif defined(HAVE_MMAP) - static const long pageSize = GetPageSize(); - unsigned NumPages = (NumBytes+pageSize-1)/pageSize; - -/* FIXME: This should use the proper autoconf flags */ -#if defined(i386) || defined(__i386__) || defined(__x86__) - /* Linux and *BSD tend to have these flags named differently. */ -#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS) -# define MAP_ANONYMOUS MAP_ANON -#endif /* defined(MAP_ANON) && !defined(MAP_ANONYMOUS) */ -#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9) -/* nothing */ -#else - std::cerr << "This architecture has an unknown MMAP implementation!\n"; - abort(); - return 0; -#endif - - int fd = -1; -#if defined(__linux__) - fd = 0; -#endif - - unsigned mmapFlags = MAP_PRIVATE|MAP_ANONYMOUS; -#ifdef MAP_NORESERVE - mmapFlags |= MAP_NORESERVE; -#endif - - void *pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC, - mmapFlags, fd, 0); - if (pa == MAP_FAILED) { - perror("mmap"); - abort(); - } - return pa; -#else - std::cerr << "Do not know how to allocate mem for the JIT without mmap!\n"; - abort(); - return 0; -#endif + return false; } - -