mirror of
https://github.com/c64scene-ar/llvm-6502.git
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Apparently, the style needs to be agreed upon first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240390 91177308-0d34-0410-b5e6-96231b3b80d8
477 lines
14 KiB
C++
477 lines
14 KiB
C++
//===- llvm/Support/Unix/Program.cpp -----------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Unix specific portion of the Program class.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_POSIX_SPAWN
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#ifdef __sun__
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#define _RESTRICT_KYWD
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#endif
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#include <spawn.h>
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#if defined(__APPLE__)
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#include <TargetConditionals.h>
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#endif
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#if defined(__APPLE__) && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)
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#define USE_NSGETENVIRON 1
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#else
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#define USE_NSGETENVIRON 0
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#endif
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#if !USE_NSGETENVIRON
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extern char **environ;
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#else
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#include <crt_externs.h> // _NSGetEnviron
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#endif
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#endif
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namespace llvm {
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using namespace sys;
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ProcessInfo::ProcessInfo() : Pid(0), ReturnCode(0) {}
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ErrorOr<std::string> sys::findProgramByName(StringRef Name,
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ArrayRef<StringRef> Paths) {
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assert(!Name.empty() && "Must have a name!");
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// Use the given path verbatim if it contains any slashes; this matches
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// the behavior of sh(1) and friends.
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if (Name.find('/') != StringRef::npos)
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return std::string(Name);
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SmallVector<StringRef, 16> EnvironmentPaths;
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if (Paths.empty())
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if (const char *PathEnv = std::getenv("PATH")) {
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SplitString(PathEnv, EnvironmentPaths, ":");
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Paths = EnvironmentPaths;
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}
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for (auto Path : Paths) {
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if (Path.empty())
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continue;
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// Check to see if this first directory contains the executable...
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SmallString<128> FilePath(Path);
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sys::path::append(FilePath, Name);
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if (sys::fs::can_execute(FilePath.c_str()))
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return std::string(FilePath.str()); // Found the executable!
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}
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return errc::no_such_file_or_directory;
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}
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static bool RedirectIO(const StringRef *Path, int FD, std::string* ErrMsg) {
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if (!Path) // Noop
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return false;
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std::string File;
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if (Path->empty())
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// Redirect empty paths to /dev/null
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File = "/dev/null";
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else
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File = *Path;
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// Open the file
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int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
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if (InFD == -1) {
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MakeErrMsg(ErrMsg, "Cannot open file '" + File + "' for "
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+ (FD == 0 ? "input" : "output"));
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return true;
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}
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// Install it as the requested FD
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if (dup2(InFD, FD) == -1) {
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MakeErrMsg(ErrMsg, "Cannot dup2");
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close(InFD);
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return true;
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}
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close(InFD); // Close the original FD
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return false;
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}
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#ifdef HAVE_POSIX_SPAWN
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static bool RedirectIO_PS(const std::string *Path, int FD, std::string *ErrMsg,
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posix_spawn_file_actions_t *FileActions) {
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if (!Path) // Noop
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return false;
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const char *File;
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if (Path->empty())
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// Redirect empty paths to /dev/null
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File = "/dev/null";
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else
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File = Path->c_str();
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if (int Err = posix_spawn_file_actions_addopen(
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FileActions, FD, File,
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FD == 0 ? O_RDONLY : O_WRONLY | O_CREAT, 0666))
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return MakeErrMsg(ErrMsg, "Cannot dup2", Err);
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return false;
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}
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#endif
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static void TimeOutHandler(int Sig) {
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}
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static void SetMemoryLimits (unsigned size)
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{
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#if HAVE_SYS_RESOURCE_H && HAVE_GETRLIMIT && HAVE_SETRLIMIT
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struct rlimit r;
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__typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
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// Heap size
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getrlimit (RLIMIT_DATA, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_DATA, &r);
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#ifdef RLIMIT_RSS
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// Resident set size.
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getrlimit (RLIMIT_RSS, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_RSS, &r);
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#endif
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#ifdef RLIMIT_AS // e.g. NetBSD doesn't have it.
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// Don't set virtual memory limit if built with any Sanitizer. They need 80Tb
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// of virtual memory for shadow memory mapping.
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#if !LLVM_MEMORY_SANITIZER_BUILD && !LLVM_ADDRESS_SANITIZER_BUILD
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// Virtual memory.
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getrlimit (RLIMIT_AS, &r);
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r.rlim_cur = limit;
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setrlimit (RLIMIT_AS, &r);
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#endif
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#endif
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#endif
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}
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}
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static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
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const char **envp, const StringRef **redirects,
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unsigned memoryLimit, std::string *ErrMsg) {
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if (!llvm::sys::fs::exists(Program)) {
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if (ErrMsg)
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*ErrMsg = std::string("Executable \"") + Program.str() +
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std::string("\" doesn't exist!");
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return false;
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}
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// If this OS has posix_spawn and there is no memory limit being implied, use
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// posix_spawn. It is more efficient than fork/exec.
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#ifdef HAVE_POSIX_SPAWN
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if (memoryLimit == 0) {
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posix_spawn_file_actions_t FileActionsStore;
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posix_spawn_file_actions_t *FileActions = nullptr;
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// If we call posix_spawn_file_actions_addopen we have to make sure the
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// c strings we pass to it stay alive until the call to posix_spawn,
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// so we copy any StringRefs into this variable.
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std::string RedirectsStorage[3];
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if (redirects) {
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std::string *RedirectsStr[3] = {nullptr, nullptr, nullptr};
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for (int I = 0; I < 3; ++I) {
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if (redirects[I]) {
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RedirectsStorage[I] = *redirects[I];
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RedirectsStr[I] = &RedirectsStorage[I];
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}
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}
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FileActions = &FileActionsStore;
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posix_spawn_file_actions_init(FileActions);
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// Redirect stdin/stdout.
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if (RedirectIO_PS(RedirectsStr[0], 0, ErrMsg, FileActions) ||
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RedirectIO_PS(RedirectsStr[1], 1, ErrMsg, FileActions))
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return false;
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if (redirects[1] == nullptr || redirects[2] == nullptr ||
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*redirects[1] != *redirects[2]) {
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// Just redirect stderr
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if (RedirectIO_PS(RedirectsStr[2], 2, ErrMsg, FileActions))
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return false;
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} else {
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// If stdout and stderr should go to the same place, redirect stderr
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// to the FD already open for stdout.
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if (int Err = posix_spawn_file_actions_adddup2(FileActions, 1, 2))
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return !MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout", Err);
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}
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}
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if (!envp)
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#if !USE_NSGETENVIRON
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envp = const_cast<const char **>(environ);
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#else
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// environ is missing in dylibs.
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envp = const_cast<const char **>(*_NSGetEnviron());
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#endif
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// Explicitly initialized to prevent what appears to be a valgrind false
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// positive.
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pid_t PID = 0;
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int Err = posix_spawn(&PID, Program.str().c_str(), FileActions,
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/*attrp*/nullptr, const_cast<char **>(args),
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const_cast<char **>(envp));
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if (FileActions)
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posix_spawn_file_actions_destroy(FileActions);
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if (Err)
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return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
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PI.Pid = PID;
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return true;
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}
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#endif
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// Create a child process.
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int child = fork();
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switch (child) {
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// An error occurred: Return to the caller.
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case -1:
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MakeErrMsg(ErrMsg, "Couldn't fork");
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return false;
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// Child process: Execute the program.
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case 0: {
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// Redirect file descriptors...
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if (redirects) {
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// Redirect stdin
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if (RedirectIO(redirects[0], 0, ErrMsg)) { return false; }
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// Redirect stdout
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if (RedirectIO(redirects[1], 1, ErrMsg)) { return false; }
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if (redirects[1] && redirects[2] &&
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*(redirects[1]) == *(redirects[2])) {
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// If stdout and stderr should go to the same place, redirect stderr
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// to the FD already open for stdout.
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if (-1 == dup2(1,2)) {
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MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
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return false;
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}
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} else {
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// Just redirect stderr
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if (RedirectIO(redirects[2], 2, ErrMsg)) { return false; }
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}
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}
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// Set memory limits
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if (memoryLimit!=0) {
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SetMemoryLimits(memoryLimit);
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}
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// Execute!
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std::string PathStr = Program;
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if (envp != nullptr)
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execve(PathStr.c_str(),
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const_cast<char **>(args),
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const_cast<char **>(envp));
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else
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execv(PathStr.c_str(),
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const_cast<char **>(args));
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// If the execve() failed, we should exit. Follow Unix protocol and
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// return 127 if the executable was not found, and 126 otherwise.
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// Use _exit rather than exit so that atexit functions and static
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// object destructors cloned from the parent process aren't
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// redundantly run, and so that any data buffered in stdio buffers
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// cloned from the parent aren't redundantly written out.
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_exit(errno == ENOENT ? 127 : 126);
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}
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// Parent process: Break out of the switch to do our processing.
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default:
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break;
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}
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PI.Pid = child;
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return true;
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}
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namespace llvm {
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ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
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bool WaitUntilTerminates, std::string *ErrMsg) {
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#ifdef HAVE_SYS_WAIT_H
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struct sigaction Act, Old;
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assert(PI.Pid && "invalid pid to wait on, process not started?");
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int WaitPidOptions = 0;
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pid_t ChildPid = PI.Pid;
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if (WaitUntilTerminates) {
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SecondsToWait = 0;
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} else if (SecondsToWait) {
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// Install a timeout handler. The handler itself does nothing, but the
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// simple fact of having a handler at all causes the wait below to return
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// with EINTR, unlike if we used SIG_IGN.
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memset(&Act, 0, sizeof(Act));
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Act.sa_handler = TimeOutHandler;
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sigemptyset(&Act.sa_mask);
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sigaction(SIGALRM, &Act, &Old);
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alarm(SecondsToWait);
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} else if (SecondsToWait == 0)
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WaitPidOptions = WNOHANG;
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// Parent process: Wait for the child process to terminate.
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int status;
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ProcessInfo WaitResult;
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do {
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WaitResult.Pid = waitpid(ChildPid, &status, WaitPidOptions);
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} while (WaitUntilTerminates && WaitResult.Pid == -1 && errno == EINTR);
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if (WaitResult.Pid != PI.Pid) {
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if (WaitResult.Pid == 0) {
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// Non-blocking wait.
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return WaitResult;
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} else {
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if (SecondsToWait && errno == EINTR) {
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// Kill the child.
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kill(PI.Pid, SIGKILL);
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// Turn off the alarm and restore the signal handler
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alarm(0);
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sigaction(SIGALRM, &Old, nullptr);
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// Wait for child to die
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if (wait(&status) != ChildPid)
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MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
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else
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MakeErrMsg(ErrMsg, "Child timed out", 0);
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WaitResult.ReturnCode = -2; // Timeout detected
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return WaitResult;
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} else if (errno != EINTR) {
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MakeErrMsg(ErrMsg, "Error waiting for child process");
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WaitResult.ReturnCode = -1;
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return WaitResult;
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}
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}
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}
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// We exited normally without timeout, so turn off the timer.
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if (SecondsToWait && !WaitUntilTerminates) {
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alarm(0);
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sigaction(SIGALRM, &Old, nullptr);
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}
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// Return the proper exit status. Detect error conditions
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// so we can return -1 for them and set ErrMsg informatively.
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int result = 0;
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if (WIFEXITED(status)) {
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result = WEXITSTATUS(status);
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WaitResult.ReturnCode = result;
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if (result == 127) {
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if (ErrMsg)
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*ErrMsg = llvm::sys::StrError(ENOENT);
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WaitResult.ReturnCode = -1;
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return WaitResult;
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}
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if (result == 126) {
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if (ErrMsg)
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*ErrMsg = "Program could not be executed";
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WaitResult.ReturnCode = -1;
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return WaitResult;
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}
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} else if (WIFSIGNALED(status)) {
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if (ErrMsg) {
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*ErrMsg = strsignal(WTERMSIG(status));
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#ifdef WCOREDUMP
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if (WCOREDUMP(status))
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*ErrMsg += " (core dumped)";
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#endif
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}
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// Return a special value to indicate that the process received an unhandled
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// signal during execution as opposed to failing to execute.
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WaitResult.ReturnCode = -2;
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}
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#else
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if (ErrMsg)
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*ErrMsg = "Program::Wait is not implemented on this platform yet!";
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ProcessInfo WaitResult;
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WaitResult.ReturnCode = -2;
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#endif
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return WaitResult;
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}
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std::error_code sys::ChangeStdinToBinary(){
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// Do nothing, as Unix doesn't differentiate between text and binary.
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return std::error_code();
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}
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std::error_code sys::ChangeStdoutToBinary(){
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// Do nothing, as Unix doesn't differentiate between text and binary.
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return std::error_code();
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}
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std::error_code
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llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
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WindowsEncodingMethod Encoding /*unused*/) {
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std::error_code EC;
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llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::F_Text);
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if (EC)
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return EC;
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OS << Contents;
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if (OS.has_error())
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return make_error_code(errc::io_error);
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return EC;
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}
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bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
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static long ArgMax = sysconf(_SC_ARG_MAX);
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// System says no practical limit.
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if (ArgMax == -1)
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return true;
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// Conservatively account for space required by environment variables.
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long HalfArgMax = ArgMax / 2;
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size_t ArgLength = 0;
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for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
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I != E; ++I) {
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ArgLength += strlen(*I) + 1;
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if (ArgLength > size_t(HalfArgMax)) {
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return false;
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}
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}
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return true;
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}
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}
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