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//===--- TaskQueue.inc - Default serial TaskQueue ---------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains a platform-agnostic implementation of TaskQueue
/// using the functions from llvm/Support/Program.h.
///
/// \note The default implementation of TaskQueue does not support parallel
/// execution, nor does it support output buffering. As a result,
/// platform-specific implementations should be preferred.
///
//===----------------------------------------------------------------------===//
#include "swift/Basic/TaskQueue.h"
#include "swift/Basic/LLVM.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Signals.h"
#if defined(_WIN32)
#define NOMINMAX
#include <Windows.h>
#include <psapi.h>
#endif
#include "Task.inc"
using namespace llvm::sys;
bool TaskQueue::supportsBufferingOutput() {
// The default implementation supports buffering output.
return true;
}
bool TaskQueue::supportsParallelExecution() {
// The default implementation does not support parallel execution.
return false;
}
unsigned TaskQueue::getNumberOfParallelTasks() const {
// The default implementation does not support parallel execution.
return 1;
}
void TaskQueue::addTask(const char *ExecPath, ArrayRef<const char *> Args,
ArrayRef<const char *> Env, void *Context,
bool SeparateErrors) {
auto T = make_unique<Task>(ExecPath, Args, Env, Context, SeparateErrors);
QueuedTasks.push(std::move(T));
}
bool TaskQueue::execute(TaskBeganCallback Began, TaskFinishedCallback Finished,
TaskSignalledCallback Signalled) {
bool ContinueExecution = true;
// This implementation of TaskQueue doesn't support parallel execution.
// We need to reference NumberOfParallelTasks to avoid warnings, though.
(void)NumberOfParallelTasks;
while (!QueuedTasks.empty() && ContinueExecution) {
std::unique_ptr<Task> T(QueuedTasks.front().release());
QueuedTasks.pop();
bool ExecutionFailed = T->execute();
if (ExecutionFailed) {
return true;
}
if (Began) {
Began(T->PI.Pid, T->Context);
}
std::string ErrMsg;
T->PI = Wait(T->PI, 0, true, &ErrMsg);
int ReturnCode = T->PI.ReturnCode;
auto StdoutBuffer = llvm::MemoryBuffer::getFile(T->StdoutPath);
StringRef StdoutContents = StdoutBuffer.get()->getBuffer();
StringRef StderrContents;
if (T->SeparateErrors) {
auto StderrBuffer = llvm::MemoryBuffer::getFile(T->StderrPath);
StderrContents = StderrBuffer.get()->getBuffer();
}
#if defined(_WIN32)
// Wait() sets the upper two bits of the return code to indicate warnings
// (10) and errors (11).
//
// This isn't a true signal on Windows, but we'll treat it as such so that
// we clean up after it properly
bool Crashed = ReturnCode & 0xC0000000;
FILETIME CreationTime;
FILETIME ExitTime;
FILETIME UtimeTicks;
FILETIME StimeTicks;
PROCESS_MEMORY_COUNTERS Counters = {};
GetProcessTimes(T->PI.Process, &CreationTime, &ExitTime, &StimeTicks,
&UtimeTicks);
// Each tick is 100ns
uint64_t Utime =
((uint64_t)UtimeTicks.dwHighDateTime << 32 | UtimeTicks.dwLowDateTime) /
10;
uint64_t Stime =
((uint64_t)StimeTicks.dwHighDateTime << 32 | StimeTicks.dwLowDateTime) /
10;
GetProcessMemoryInfo(T->PI.Process, &Counters, sizeof(Counters));
TaskProcessInformation TPI(T->PI.Pid, Utime, Stime,
Counters.PeakWorkingSetSize);
#else
// Wait() returning a return code of -2 indicates the process received
// a signal during execution.
bool Crashed = ReturnCode == -2;
TaskProcessInformation TPI(T->PI.Pid);
#endif
if (Crashed) {
if (Signalled) {
TaskFinishedResponse Response =
Signalled(T->PI.Pid, ErrMsg, StdoutContents, StderrContents,
T->Context, ReturnCode, TPI);
ContinueExecution = Response != TaskFinishedResponse::StopExecution;
} else {
// If we don't have a Signalled callback, unconditionally stop.
ContinueExecution = false;
}
} else {
// Wait() returned a normal return code, so just indicate that the task
// finished.
if (Finished) {
TaskFinishedResponse Response =
Finished(T->PI.Pid, T->PI.ReturnCode, StdoutContents,
StderrContents, TPI, T->Context);
ContinueExecution = Response != TaskFinishedResponse::StopExecution;
} else if (T->PI.ReturnCode != 0) {
ContinueExecution = false;
}
}
llvm::sys::fs::remove(T->StdoutPath);
if (T->SeparateErrors)
llvm::sys::fs::remove(T->StderrPath);
}
return !ContinueExecution;
}
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