llvm-6502/lib/Support/Windows/Program.inc
Alp Toker d07a8a2491 Fix initialization order warning in mingw32 build
No change in functionality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192953 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-18 07:09:58 +00:00

463 lines
14 KiB
C++

//===- Win32/Program.cpp - Win32 Program Implementation ------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Program class.
//
//===----------------------------------------------------------------------===//
#include "Windows.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/FileSystem.h"
#include <cstdio>
#include <fcntl.h>
#include <io.h>
#include <malloc.h>
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code
//===----------------------------------------------------------------------===//
namespace llvm {
using namespace sys;
ProcessInfo::ProcessInfo() : ProcessHandle(0), Pid(0), ReturnCode(0) {}
// This function just uses the PATH environment variable to find the program.
std::string sys::FindProgramByName(const std::string &progName) {
// Check some degenerate cases
if (progName.length() == 0) // no program
return "";
std::string temp = progName;
// Return paths with slashes verbatim.
if (progName.find('\\') != std::string::npos ||
progName.find('/') != std::string::npos)
return temp;
// At this point, the file name is valid and does not contain slashes.
// Let Windows search for it.
SmallVector<wchar_t, MAX_PATH> progNameUnicode;
if (windows::UTF8ToUTF16(progName, progNameUnicode))
return "";
SmallVector<wchar_t, MAX_PATH> buffer;
DWORD len = MAX_PATH;
do {
buffer.reserve(len);
len = ::SearchPathW(NULL, progNameUnicode.data(), L".exe",
buffer.capacity(), buffer.data(), NULL);
// See if it wasn't found.
if (len == 0)
return "";
// Buffer was too small; grow and retry.
} while (len > buffer.capacity());
buffer.set_size(len);
SmallVector<char, MAX_PATH> result;
if (windows::UTF16ToUTF8(buffer.begin(), buffer.size(), result))
return "";
return std::string(result.data(), result.size());
}
static HANDLE RedirectIO(const StringRef *path, int fd, std::string* ErrMsg) {
HANDLE h;
if (path == 0) {
if (!DuplicateHandle(GetCurrentProcess(), (HANDLE)_get_osfhandle(fd),
GetCurrentProcess(), &h,
0, TRUE, DUPLICATE_SAME_ACCESS))
return INVALID_HANDLE_VALUE;
return h;
}
std::string fname;
if (path->empty())
fname = "NUL";
else
fname = *path;
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = 0;
sa.bInheritHandle = TRUE;
SmallVector<wchar_t, 128> fnameUnicode;
if (windows::UTF8ToUTF16(fname, fnameUnicode))
return INVALID_HANDLE_VALUE;
h = CreateFileW(fnameUnicode.data(), fd ? GENERIC_WRITE : GENERIC_READ,
FILE_SHARE_READ, &sa, fd == 0 ? OPEN_EXISTING : CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
MakeErrMsg(ErrMsg, std::string(fname) + ": Can't open file for " +
(fd ? "input: " : "output: "));
}
return h;
}
/// ArgNeedsQuotes - Check whether argument needs to be quoted when calling
/// CreateProcess.
static bool ArgNeedsQuotes(const char *Str) {
return Str[0] == '\0' || strpbrk(Str, "\t \"&\'()*<>\\`^|") != 0;
}
/// CountPrecedingBackslashes - Returns the number of backslashes preceding Cur
/// in the C string Start.
static unsigned int CountPrecedingBackslashes(const char *Start,
const char *Cur) {
unsigned int Count = 0;
--Cur;
while (Cur >= Start && *Cur == '\\') {
++Count;
--Cur;
}
return Count;
}
/// EscapePrecedingEscapes - Append a backslash to Dst for every backslash
/// preceding Cur in the Start string. Assumes Dst has enough space.
static char *EscapePrecedingEscapes(char *Dst, const char *Start,
const char *Cur) {
unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Cur);
while (PrecedingEscapes > 0) {
*Dst++ = '\\';
--PrecedingEscapes;
}
return Dst;
}
/// ArgLenWithQuotes - Check whether argument needs to be quoted when calling
/// CreateProcess and returns length of quoted arg with escaped quotes
static unsigned int ArgLenWithQuotes(const char *Str) {
const char *Start = Str;
bool Quoted = ArgNeedsQuotes(Str);
unsigned int len = Quoted ? 2 : 0;
while (*Str != '\0') {
if (*Str == '\"') {
// We need to add a backslash, but ensure that it isn't escaped.
unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
len += PrecedingEscapes + 1;
}
// Note that we *don't* need to escape runs of backslashes that don't
// precede a double quote! See MSDN:
// http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
++len;
++Str;
}
if (Quoted) {
// Make sure the closing quote doesn't get escaped by a trailing backslash.
unsigned PrecedingEscapes = CountPrecedingBackslashes(Start, Str);
len += PrecedingEscapes + 1;
}
return len;
}
}
static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
const char **envp, const StringRef **redirects,
unsigned memoryLimit, std::string *ErrMsg) {
if (!sys::fs::can_execute(Program)) {
if (ErrMsg)
*ErrMsg = "program not executable";
return false;
}
// Windows wants a command line, not an array of args, to pass to the new
// process. We have to concatenate them all, while quoting the args that
// have embedded spaces (or are empty).
// First, determine the length of the command line.
unsigned len = 0;
for (unsigned i = 0; args[i]; i++) {
len += ArgLenWithQuotes(args[i]) + 1;
}
// Now build the command line.
OwningArrayPtr<char> command(new char[len+1]);
char *p = command.get();
for (unsigned i = 0; args[i]; i++) {
const char *arg = args[i];
const char *start = arg;
bool needsQuoting = ArgNeedsQuotes(arg);
if (needsQuoting)
*p++ = '"';
while (*arg != '\0') {
if (*arg == '\"') {
// Escape all preceding escapes (if any), and then escape the quote.
p = EscapePrecedingEscapes(p, start, arg);
*p++ = '\\';
}
*p++ = *arg++;
}
if (needsQuoting) {
// Make sure our quote doesn't get escaped by a trailing backslash.
p = EscapePrecedingEscapes(p, start, arg);
*p++ = '"';
}
*p++ = ' ';
}
*p = 0;
// The pointer to the environment block for the new process.
std::vector<wchar_t> EnvBlock;
if (envp) {
// An environment block consists of a null-terminated block of
// null-terminated strings. Convert the array of environment variables to
// an environment block by concatenating them.
for (unsigned i = 0; envp[i]; ++i) {
SmallVector<wchar_t, MAX_PATH> EnvString;
if (error_code ec = windows::UTF8ToUTF16(envp[i], EnvString)) {
SetLastError(ec.value());
MakeErrMsg(ErrMsg, "Unable to convert environment variable to UTF-16");
return false;
}
EnvBlock.insert(EnvBlock.end(), EnvString.begin(), EnvString.end());
EnvBlock.push_back(0);
}
EnvBlock.push_back(0);
}
// Create a child process.
STARTUPINFOW si;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.hStdInput = INVALID_HANDLE_VALUE;
si.hStdOutput = INVALID_HANDLE_VALUE;
si.hStdError = INVALID_HANDLE_VALUE;
if (redirects) {
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = RedirectIO(redirects[0], 0, ErrMsg);
if (si.hStdInput == INVALID_HANDLE_VALUE) {
MakeErrMsg(ErrMsg, "can't redirect stdin");
return false;
}
si.hStdOutput = RedirectIO(redirects[1], 1, ErrMsg);
if (si.hStdOutput == INVALID_HANDLE_VALUE) {
CloseHandle(si.hStdInput);
MakeErrMsg(ErrMsg, "can't redirect stdout");
return false;
}
if (redirects[1] && redirects[2] && *(redirects[1]) == *(redirects[2])) {
// If stdout and stderr should go to the same place, redirect stderr
// to the handle already open for stdout.
if (!DuplicateHandle(GetCurrentProcess(), si.hStdOutput,
GetCurrentProcess(), &si.hStdError,
0, TRUE, DUPLICATE_SAME_ACCESS)) {
CloseHandle(si.hStdInput);
CloseHandle(si.hStdOutput);
MakeErrMsg(ErrMsg, "can't dup stderr to stdout");
return false;
}
} else {
// Just redirect stderr
si.hStdError = RedirectIO(redirects[2], 2, ErrMsg);
if (si.hStdError == INVALID_HANDLE_VALUE) {
CloseHandle(si.hStdInput);
CloseHandle(si.hStdOutput);
MakeErrMsg(ErrMsg, "can't redirect stderr");
return false;
}
}
}
PROCESS_INFORMATION pi;
memset(&pi, 0, sizeof(pi));
fflush(stdout);
fflush(stderr);
SmallVector<wchar_t, MAX_PATH> ProgramUtf16;
if (error_code ec = windows::UTF8ToUTF16(Program, ProgramUtf16)) {
SetLastError(ec.value());
MakeErrMsg(ErrMsg,
std::string("Unable to convert application name to UTF-16"));
return false;
}
SmallVector<wchar_t, MAX_PATH> CommandUtf16;
if (error_code ec = windows::UTF8ToUTF16(command.get(), CommandUtf16)) {
SetLastError(ec.value());
MakeErrMsg(ErrMsg,
std::string("Unable to convert command-line to UTF-16"));
return false;
}
BOOL rc = CreateProcessW(ProgramUtf16.data(), CommandUtf16.data(), 0, 0,
TRUE, CREATE_UNICODE_ENVIRONMENT,
EnvBlock.empty() ? 0 : EnvBlock.data(), 0, &si,
&pi);
DWORD err = GetLastError();
// Regardless of whether the process got created or not, we are done with
// the handles we created for it to inherit.
CloseHandle(si.hStdInput);
CloseHandle(si.hStdOutput);
CloseHandle(si.hStdError);
// Now return an error if the process didn't get created.
if (!rc) {
SetLastError(err);
MakeErrMsg(ErrMsg, std::string("Couldn't execute program '") +
Program.str() + "'");
return false;
}
PI.Pid = pi.dwProcessId;
PI.ProcessHandle = pi.hProcess;
// Make sure these get closed no matter what.
ScopedCommonHandle hThread(pi.hThread);
// Assign the process to a job if a memory limit is defined.
ScopedJobHandle hJob;
if (memoryLimit != 0) {
hJob = CreateJobObjectW(0, 0);
bool success = false;
if (hJob) {
JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli;
memset(&jeli, 0, sizeof(jeli));
jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;
jeli.ProcessMemoryLimit = uintptr_t(memoryLimit) * 1048576;
if (SetInformationJobObject(hJob, JobObjectExtendedLimitInformation,
&jeli, sizeof(jeli))) {
if (AssignProcessToJobObject(hJob, pi.hProcess))
success = true;
}
}
if (!success) {
SetLastError(GetLastError());
MakeErrMsg(ErrMsg, std::string("Unable to set memory limit"));
TerminateProcess(pi.hProcess, 1);
WaitForSingleObject(pi.hProcess, INFINITE);
return false;
}
}
return true;
}
namespace llvm {
ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
bool WaitUntilChildTerminates, std::string *ErrMsg) {
assert(PI.Pid && "invalid pid to wait on, process not started?");
assert(PI.ProcessHandle &&
"invalid process handle to wait on, process not started?");
DWORD milliSecondsToWait = 0;
if (WaitUntilChildTerminates)
milliSecondsToWait = INFINITE;
else if (SecondsToWait > 0)
milliSecondsToWait = SecondsToWait * 1000;
ProcessInfo WaitResult = PI;
DWORD WaitStatus = WaitForSingleObject(PI.ProcessHandle, milliSecondsToWait);
if (WaitStatus == WAIT_TIMEOUT) {
if (SecondsToWait) {
if (!TerminateProcess(PI.ProcessHandle, 1)) {
if (ErrMsg)
MakeErrMsg(ErrMsg, "Failed to terminate timed-out program.");
// -2 indicates a crash or timeout as opposed to failure to execute.
WaitResult.ReturnCode = -2;
CloseHandle(PI.ProcessHandle);
return WaitResult;
}
WaitForSingleObject(PI.ProcessHandle, INFINITE);
CloseHandle(PI.ProcessHandle);
} else {
// Non-blocking wait.
return ProcessInfo();
}
}
// Get its exit status.
DWORD status;
BOOL rc = GetExitCodeProcess(PI.ProcessHandle, &status);
DWORD err = GetLastError();
CloseHandle(PI.ProcessHandle);
if (!rc) {
SetLastError(err);
if (ErrMsg)
MakeErrMsg(ErrMsg, "Failed getting status for program.");
// -2 indicates a crash or timeout as opposed to failure to execute.
WaitResult.ReturnCode = -2;
return WaitResult;
}
if (!status)
return WaitResult;
// Pass 10(Warning) and 11(Error) to the callee as negative value.
if ((status & 0xBFFF0000U) == 0x80000000U)
WaitResult.ReturnCode = static_cast<int>(status);
else if (status & 0xFF)
WaitResult.ReturnCode = status & 0x7FFFFFFF;
else
WaitResult.ReturnCode = 1;
return WaitResult;
}
error_code sys::ChangeStdinToBinary(){
int result = _setmode( _fileno(stdin), _O_BINARY );
if (result == -1)
return error_code(errno, generic_category());
return make_error_code(errc::success);
}
error_code sys::ChangeStdoutToBinary(){
int result = _setmode( _fileno(stdout), _O_BINARY );
if (result == -1)
return error_code(errno, generic_category());
return make_error_code(errc::success);
}
error_code sys::ChangeStderrToBinary(){
int result = _setmode( _fileno(stderr), _O_BINARY );
if (result == -1)
return error_code(errno, generic_category());
return make_error_code(errc::success);
}
bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
// The documented max length of the command line passed to CreateProcess.
static const size_t MaxCommandStringLength = 32768;
size_t ArgLength = 0;
for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
I != E; ++I) {
// Account for the trailing space for every arg but the last one and the
// trailing NULL of the last argument.
ArgLength += ArgLenWithQuotes(*I) + 1;
if (ArgLength > MaxCommandStringLength) {
return false;
}
}
return true;
}
}