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Compilation.cpp
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//===--- Compilation.cpp - Compilation Task Data Structure ----------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//
#include "swift/Driver/Compilation.h"
#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsDriver.h"
#include "swift/AST/FineGrainedDependencies.h"
#include "swift/AST/FineGrainedDependencyFormat.h"
#include "swift/Basic/OutputFileMap.h"
#include "swift/Basic/ParseableOutput.h"
#include "swift/Basic/Program.h"
#include "swift/Basic/STLExtras.h"
#include "swift/Basic/Statistic.h"
#include "swift/Basic/TaskQueue.h"
#include "swift/Basic/Version.h"
#include "swift/Basic/type_traits.h"
#include "swift/Driver/Action.h"
#include "swift/Driver/Driver.h"
#include "swift/Driver/FineGrainedDependencyDriverGraph.h"
#include "swift/Driver/Job.h"
#include "swift/Driver/ToolChain.h"
#include "swift/Option/Options.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/TinyPtrVector.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Chrono.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/YAMLParser.h"
#include "llvm/Support/raw_ostream.h"
#include "CompilationRecord.h"
#include <fstream>
#include <signal.h>
#if defined(_WIN32)
#include <fcntl.h>
#include <io.h>
#endif
#define DEBUG_TYPE "batch-mode"
// Batch-mode has a sub-mode for testing that randomizes batch partitions,
// by user-provided seed. That is the only thing randomized here.
#include <random>
using namespace swift;
using namespace swift::sys;
using namespace swift::driver;
using namespace swift::parseable_output;
using namespace llvm::opt;
struct LogJob {
const Job *j;
LogJob(const Job *j) : j(j) {}
};
struct LogJobArray {
const ArrayRef<const Job *> js;
LogJobArray(const ArrayRef<const Job *> js) : js(js) {}
};
struct LogJobSet {
const SmallPtrSetImpl<const Job*> &js;
LogJobSet(const SmallPtrSetImpl<const Job*> &js) : js(js) {}
};
llvm::raw_ostream &operator<<(llvm::raw_ostream &os, const LogJob &lj) {
lj.j->printSummary(os);
return os;
}
llvm::raw_ostream &operator<<(llvm::raw_ostream &os, const LogJobArray &ljs) {
os << "[";
interleave(ljs.js,
[&](Job const *j) { os << LogJob(j); },
[&]() { os << ' '; });
os << "]";
return os;
}
llvm::raw_ostream &operator<<(llvm::raw_ostream &os, const LogJobSet &ljs) {
os << "{";
interleave(ljs.js,
[&](Job const *j) { os << LogJob(j); },
[&]() { os << ' '; });
os << "}";
return os;
}
// clang-format off
Compilation::Compilation(DiagnosticEngine &Diags,
const ToolChain &TC,
OutputInfo const &OI,
OutputLevel Level,
std::unique_ptr<InputArgList> InputArgs,
std::unique_ptr<DerivedArgList> TranslatedArgs,
InputFileList InputsWithTypes,
std::string CompilationRecordPath,
StringRef ArgsHash,
llvm::sys::TimePoint<> StartTime,
llvm::sys::TimePoint<> LastBuildTime,
size_t FilelistThreshold,
bool EnableIncrementalBuild,
bool EnableBatchMode,
unsigned BatchSeed,
llvm::Optional<unsigned> BatchCount,
llvm::Optional<unsigned> BatchSizeLimit,
bool SaveTemps,
bool ShowDriverTimeCompilation,
std::unique_ptr<UnifiedStatsReporter> StatsReporter,
bool OnlyOneDependencyFile,
bool VerifyFineGrainedDependencyGraphAfterEveryImport,
bool EmitFineGrainedDependencyDotFileAfterEveryImport,
bool EnableCrossModuleIncrementalBuild)
: Diags(Diags), TheToolChain(TC),
TheOutputInfo(OI),
Level(Level),
RawInputArgs(std::move(InputArgs)),
TranslatedArgs(std::move(TranslatedArgs)),
InputFilesWithTypes(std::move(InputsWithTypes)),
CompilationRecordPath(CompilationRecordPath),
ArgsHash(ArgsHash),
BuildStartTime(StartTime),
LastBuildTime(LastBuildTime),
EnableIncrementalBuild(EnableIncrementalBuild),
EnableBatchMode(EnableBatchMode),
BatchSeed(BatchSeed),
BatchCount(BatchCount),
BatchSizeLimit(BatchSizeLimit),
SaveTemps(SaveTemps),
ShowDriverTimeCompilation(ShowDriverTimeCompilation),
Stats(std::move(StatsReporter)),
FilelistThreshold(FilelistThreshold),
OnlyOneDependencyFile(OnlyOneDependencyFile),
VerifyFineGrainedDependencyGraphAfterEveryImport(
VerifyFineGrainedDependencyGraphAfterEveryImport),
EmitFineGrainedDependencyDotFileAfterEveryImport(
EmitFineGrainedDependencyDotFileAfterEveryImport),
EnableCrossModuleIncrementalBuild(EnableCrossModuleIncrementalBuild)
{ }
// clang-format on
static bool writeFilelistIfNecessary(const Job *job, const ArgList &args,
DiagnosticEngine &diags);
using CommandSetVector = llvm::SetVector<const Job*>;
using BatchPartition = std::vector<std::vector<const Job*>>;
using InputInfoMap = llvm::SmallMapVector<const llvm::opt::Arg *,
CompileJobAction::InputInfo, 16>;
namespace {
static DetailedTaskDescription
constructDetailedTaskDescription(const driver::Job &Cmd) {
std::string Executable = Cmd.getExecutable();
SmallVector<std::string, 16> Arguments;
std::string CommandLine;
SmallVector<CommandInput, 4> Inputs;
SmallVector<OutputPair, 8> Outputs;
for (const auto &A : Cmd.getArguments()) {
Arguments.push_back(A);
}
llvm::raw_string_ostream wrapper(CommandLine);
Cmd.printCommandLine(wrapper, "");
wrapper.flush();
for (const Action *A : Cmd.getSource().getInputs()) {
if (const auto *IA = dyn_cast<InputAction>(A))
Inputs.push_back(CommandInput(IA->getInputArg().getValue()));
}
for (const driver::Job *J : Cmd.getInputs()) {
auto OutFiles = J->getOutput().getPrimaryOutputFilenames();
if (const auto *BJAction = dyn_cast<BackendJobAction>(&Cmd.getSource())) {
Inputs.push_back(CommandInput(OutFiles[BJAction->getInputIndex()]));
} else {
for (llvm::StringRef FileName : OutFiles) {
Inputs.push_back(CommandInput(FileName));
}
}
}
// TODO: set up Outputs appropriately.
file_types::ID PrimaryOutputType = Cmd.getOutput().getPrimaryOutputType();
if (PrimaryOutputType != file_types::TY_Nothing) {
for (llvm::StringRef OutputFileName :
Cmd.getOutput().getPrimaryOutputFilenames()) {
Outputs.push_back(OutputPair(PrimaryOutputType, OutputFileName.str()));
}
}
file_types::forAllTypes([&](file_types::ID Ty) {
for (auto Output : Cmd.getOutput().getAdditionalOutputsForType(Ty)) {
Outputs.push_back(OutputPair(Ty, Output.str()));
}
});
return DetailedTaskDescription{Executable, Arguments, CommandLine, Inputs,
Outputs};
}
} // namespace
namespace swift {
namespace driver {
class PerformJobsState {
/// The containing Compilation object.
Compilation &Comp;
/// All jobs which have been scheduled for execution (whether or not
/// they've finished execution), or which have been determined that they
/// don't need to run.
CommandSet ScheduledCommands;
/// A temporary buffer to hold commands that were scheduled but haven't been
/// added to the Task Queue yet, because we might try batching them together
/// first.
CommandSetVector PendingExecution;
/// Set of synthetic BatchJobs that serve to cluster subsets of jobs waiting
/// in PendingExecution. Also used to identify (then unpack) BatchJobs back
/// to their underlying non-Batch Jobs, when running a callback from
/// TaskQueue.
CommandSet BatchJobs;
/// Persistent counter for allocating quasi-PIDs to Jobs combined into
/// BatchJobs. Quasi-PIDs are _negative_ PID-like unique keys used to
/// masquerade BatchJob constituents as (quasi)processes, when writing
/// parseable output to consumers that don't understand the idea of a batch
/// job. They are negative in order to avoid possibly colliding with real
/// PIDs (which are always positive). We start at -1000 here as a crude but
/// harmless hedge against colliding with an errno value that might slip
/// into the stream of real PIDs (say, due to a TaskQueue bug).
int64_t NextBatchQuasiPID = parseable_output::QUASI_PID_START;
/// All jobs which have finished execution or which have been determined
/// that they don't need to run.
CommandSet FinishedCommands;
/// A map from a Job to the commands it is known to be blocking.
///
/// The blocked jobs should be scheduled as soon as possible.
llvm::SmallDenseMap<const Job *, TinyPtrVector<const Job *>, 16>
BlockingCommands;
/// A map from commands that didn't get to run to whether or not they affect
/// downstream commands.
///
/// Only intended for source files.
llvm::SmallDenseMap<const Job *, bool, 16> UnfinishedCommands;
/// Jobs that incremental-mode has decided it can skip.
CommandSet DeferredCommands;
public:
/// Dependency graphs for deciding which jobs are dirty (need running)
/// or clean (can be skipped).
fine_grained_dependencies::ModuleDepGraph FineGrainedDepGraph;
private:
/// TaskQueue for execution.
std::unique_ptr<TaskQueue> TQ;
/// Cumulative result of PerformJobs(), accumulated from subprocesses.
int ResultCode = EXIT_SUCCESS;
/// True if any Job crashed.
bool AnyAbnormalExit = false;
/// Timers for monitoring execution time of subprocesses.
llvm::TimerGroup DriverTimerGroup {"driver", "Driver Compilation Time"};
llvm::SmallDenseMap<const Job *, std::unique_ptr<llvm::Timer>, 16>
DriverTimers;
void noteBuilding(const Job *cmd, const bool willBeBuilding,
StringRef reason) const {
if (!Comp.getShowIncrementalBuildDecisions())
return;
if (ScheduledCommands.count(cmd))
return;
if (!willBeBuilding)
return;
llvm::outs() << "Queuing " << reason << ": " << LogJob(cmd) << "\n";
getFineGrainedDepGraph().printPath(llvm::outs(), cmd);
}
template <typename JobsCollection>
void noteBuildingJobs(const JobsCollection &unsortedJobsArg,
const StringRef reason) const {
if (!Comp.getShowIncrementalBuildDecisions() &&
!Comp.getShowJobLifecycle())
return;
// Sigh, must manually convert SmallPtrSet to ArrayRef-able container
llvm::SmallVector<const Job *, 16> unsortedJobs;
for (const Job *j : unsortedJobsArg)
unsortedJobs.push_back(j);
llvm::SmallVector<const Job *, 16> sortedJobs;
Comp.sortJobsToMatchCompilationInputs(unsortedJobs, sortedJobs);
for (const Job *j : sortedJobs)
noteBuilding(j, /*willBeBuilding=*/true, reason);
}
const Job *findUnfinishedJob(ArrayRef<const Job *> JL) {
for (const Job *Cmd : JL) {
if (!FinishedCommands.count(Cmd))
return Cmd;
}
return nullptr;
}
/// Schedule the given Job if it has not been scheduled and if all of
/// its inputs are in FinishedCommands.
void scheduleCommandIfNecessaryAndPossible(const Job *Cmd) {
if (ScheduledCommands.count(Cmd)) {
if (Comp.getShowJobLifecycle()) {
llvm::outs() << "Already scheduled: " << LogJob(Cmd) << "\n";
}
return;
}
if (auto Blocking = findUnfinishedJob(Cmd->getInputs())) {
BlockingCommands[Blocking].push_back(Cmd);
if (Comp.getShowJobLifecycle()) {
llvm::outs() << "Blocked by: " << LogJob(Blocking)
<< ", now blocking jobs: "
<< LogJobArray(BlockingCommands[Blocking]) << "\n";
}
return;
}
#ifndef NDEBUG
// If we can, assert that no compile jobs are scheduled beyond the second
// wave. If this assertion fails, it indicates one of:
// 1) A failure of the driver's job tracing machinery to follow a
// dependency arc.
// 2) A failure of the frontend to emit a dependency arc.
if (isa<CompileJobAction>(Cmd->getSource()) && Cmd->getWave() > 2) {
llvm_unreachable("Scheduled a command into a third wave!");
}
#endif
// Adding to scheduled means we've committed to its completion (not
// distinguished from skipping). We never remove it once inserted.
ScheduledCommands.insert(Cmd);
// Adding to pending means it should be in the next round of additions to
// the task queue (either batched or singularly); we remove Jobs from
// PendingExecution once we hand them over to the TaskQueue.
PendingExecution.insert(Cmd);
}
// Sort for ease of testing
template <typename Jobs>
void scheduleCommandsInSortedOrder(const Jobs &jobs) {
llvm::SmallVector<const Job *, 16> sortedJobs;
Comp.sortJobsToMatchCompilationInputs(jobs, sortedJobs);
for (const Job *Cmd : sortedJobs)
scheduleCommandIfNecessaryAndPossible(Cmd);
}
void addPendingJobToTaskQueue(const Job *Cmd) {
// FIXME: Failing here should not take down the whole process.
bool success =
writeFilelistIfNecessary(Cmd, Comp.getArgs(), Comp.getDiags());
assert(success && "failed to write filelist");
(void)success;
assert(Cmd->getExtraEnvironment().empty() &&
"not implemented for compilations with multiple jobs");
if (Comp.getShowJobLifecycle())
llvm::outs() << "Added to TaskQueue: " << LogJob(Cmd) << "\n";
TQ->addTask(Cmd->getExecutable(), Cmd->getArgumentsForTaskExecution(),
llvm::None, (void *)Cmd);
}
/// When a task finishes, check other Jobs that may be blocked.
void markFinished(const Job *Cmd, bool Skipped=false) {
if (Comp.getShowJobLifecycle()) {
llvm::outs() << "Job "
<< (Skipped ? "skipped" : "finished")
<< ": " << LogJob(Cmd) << "\n";
}
FinishedCommands.insert(Cmd);
if (auto *Stats = Comp.getStatsReporter()) {
auto &D = Stats->getDriverCounters();
if (Skipped)
++D.NumDriverJobsSkipped;
else
++D.NumDriverJobsRun;
}
auto BlockedIter = BlockingCommands.find(Cmd);
if (BlockedIter != BlockingCommands.end()) {
auto AllBlocked = std::move(BlockedIter->second);
if (Comp.getShowJobLifecycle()) {
llvm::outs() << "Scheduling maybe-unblocked jobs: "
<< LogJobArray(AllBlocked) << "\n";
}
BlockingCommands.erase(BlockedIter);
scheduleCommandsInSortedOrder(AllBlocked);
}
}
bool isBatchJob(const Job *MaybeBatchJob) const {
return BatchJobs.count(MaybeBatchJob) != 0;
}
/// Callback which will be called immediately after a task has started. This
/// callback may be used to provide output indicating that the task began.
void taskBegan(ProcessId Pid, void *Context) {
// TODO: properly handle task began.
const Job *BeganCmd = (const Job *)Context;
if (Comp.getShowDriverTimeCompilation()) {
llvm::SmallString<128> TimerName;
llvm::raw_svector_ostream OS(TimerName);
OS << LogJob(BeganCmd);
DriverTimers.insert({
BeganCmd,
std::unique_ptr<llvm::Timer>(
new llvm::Timer("task", OS.str(), DriverTimerGroup))
});
DriverTimers[BeganCmd]->startTimer();
}
switch (Comp.getOutputLevel()) {
case OutputLevel::Normal:
break;
// For command line or verbose output, print out each command as it
// begins execution.
case OutputLevel::PrintJobs:
BeganCmd->printCommandLineAndEnvironment(llvm::outs());
break;
case OutputLevel::Verbose:
BeganCmd->printCommandLine(llvm::errs());
break;
case OutputLevel::Parseable:
BeganCmd->forEachContainedJobAndPID(Pid, [&](const Job *J, Job::PID P) {
auto TascDesc = constructDetailedTaskDescription(*J);
parseable_output::emitBeganMessage(llvm::errs(),
J->getSource().getClassName(),
TascDesc, P,
TaskProcessInformation(Pid));
});
break;
}
}
/// Note that a .swiftdeps file failed to load and take corrective actions:
/// disable incremental logic and schedule all existing deferred commands.
void
dependencyLoadFailed(StringRef DependenciesFile, bool Warn=true) {
if (Warn && Comp.getShowIncrementalBuildDecisions())
Comp.getDiags().diagnose(SourceLoc(),
diag::warn_unable_to_load_dependencies,
DependenciesFile);
Comp.disableIncrementalBuild(
Twine("malformed swift dependencies file '") + DependenciesFile +
"'");
}
/// Helper that attempts to reload a job's .swiftdeps file after the job
/// exits, and re-run transitive marking to ensure everything is properly
/// invalidated by any new dependency edges introduced by it. If reloading
/// fails, this can cause deferred jobs to be immediately scheduled.
std::vector<const Job*>
reloadAndRemarkDeps(const Job *FinishedCmd, int ReturnCode) {
const CommandOutput &Output = FinishedCmd->getOutput();
StringRef DependenciesFile =
Output.getAdditionalOutputForType(file_types::TY_SwiftDeps);
if (DependenciesFile.empty()) {
// If this job doesn't track dependencies, it must always be run.
// Note: In theory CheckDependencies makes sense as well (for a leaf
// node in the dependency graph), and maybe even NewlyAdded (for very
// coarse dependencies that always affect downstream nodes), but we're
// not using either of those right now, and this logic should probably
// be revisited when we are.
assert(isa<MergeModuleJobAction>(FinishedCmd->getSource()) ||
FinishedCmd->getCondition() == Job::Condition::Always);
return {};
}
const bool compileExitedNormally =
ReturnCode == EXIT_SUCCESS || ReturnCode == EXIT_FAILURE;
return !compileExitedNormally
? reloadAndRemarkDepsOnAbnormalExit(FinishedCmd)
: reloadAndRemarkDepsOnNormalExit(FinishedCmd, /*cmdFailed=*/
ReturnCode != EXIT_SUCCESS,
DependenciesFile);
}
// If we have a dependency file /and/ the frontend task exited normally,
// we can be discerning about what downstream files to rebuild.
std::vector<const Job *>
reloadAndRemarkDepsOnNormalExit(const Job *FinishedCmd,
const bool cmdFailed,
StringRef DependenciesFile) {
const auto changedNodes = getFineGrainedDepGraph().loadFromPath(
FinishedCmd, DependenciesFile, Comp.getDiags());
const bool loadFailed = !changedNodes;
if (loadFailed) {
handleDependenciesReloadFailure(cmdFailed, DependenciesFile);
return {};
}
return getFineGrainedDepGraph()
.findJobsToRecompileWhenNodesChange(changedNodes.value());
}
void handleDependenciesReloadFailure(const bool cmdFailed,
const StringRef DependenciesFile) {
if (cmdFailed) {
// let the next build handle it.
return;
}
dependencyLoadFailed(DependenciesFile);
// Better try compiling whatever was waiting on more info.
for (const Job *Cmd : DeferredCommands)
scheduleCommandIfNecessaryAndPossible(Cmd);
DeferredCommands.clear();
};
std::vector<const Job *>
reloadAndRemarkDepsOnAbnormalExit(const Job *FinishedCmd) {
// If there's an abnormal exit (a crash), assume the worst.
switch (FinishedCmd->getCondition()) {
case Job::Condition::NewlyAdded:
// The job won't be treated as newly added next time. Conservatively
// mark it as affecting other jobs, because some of them may have
// completed already.
return findJobsToRecompileWhenWholeJobChanges(FinishedCmd);
case Job::Condition::Always:
// Any incremental task that shows up here has already been marked;
// we didn't need to wait for it to finish to start downstream
// tasks.
break;
case Job::Condition::RunWithoutCascading:
// If this file changed, it might have been a non-cascading change
// and it might not. Unfortunately, the interface hash has been
// updated or compromised, so we don't actually know anymore; we
// have to conservatively assume the changes could affect other
// files.
return findJobsToRecompileWhenWholeJobChanges(FinishedCmd);
case Job::Condition::CheckDependencies:
// If the only reason we're running this is because something else
// changed, then we can trust the dependency graph as to whether
// it's a cascading or non-cascading change. That is, if whatever
// /caused/ the error isn't supposed to affect other files, and
// whatever /fixes/ the error isn't supposed to affect other files,
// then there's no need to recompile any other inputs. If either of
// those are false, we /do/ need to recompile other inputs.
break;
}
return {};
}
/// Check to see if a job produced a zero-length serialized diagnostics
/// file, which is used to indicate batch-constituents that were batched
/// together with a failing constituent but did not, themselves, produce any
/// errors.
bool jobWasBatchedWithFailingJobs(const Job *J) const {
auto DiaPath =
J->getOutput().getAnyOutputForType(file_types::TY_SerializedDiagnostics);
if (DiaPath.empty())
return false;
if (!llvm::sys::fs::is_regular_file(DiaPath))
return false;
uint64_t Size;
auto EC = llvm::sys::fs::file_size(DiaPath, Size);
if (EC)
return false;
return Size == 0;
}
/// If a batch-constituent job happens to be batched together with a job
/// that exits with an error, the batch-constituent may be considered
/// "cancelled".
bool jobIsCancelledBatchConstituent(int ReturnCode,
const Job *ContainerJob,
const Job *ConstituentJob) {
return ReturnCode != 0 &&
isBatchJob(ContainerJob) &&
jobWasBatchedWithFailingJobs(ConstituentJob);
}
/// Unpack a \c BatchJob that has finished into its constituent \c Job
/// members, and call \c taskFinished on each, propagating any \c
/// TaskFinishedResponse other than \c
/// TaskFinishedResponse::ContinueExecution from any of the constituent
/// calls.
TaskFinishedResponse
unpackAndFinishBatch(int ReturnCode, StringRef Output,
StringRef Errors, const BatchJob *B) {
if (Comp.getShowJobLifecycle())
llvm::outs() << "Batch job finished: " << LogJob(B) << "\n";
auto res = TaskFinishedResponse::ContinueExecution;
for (const Job *J : B->getCombinedJobs()) {
if (Comp.getShowJobLifecycle())
llvm::outs() << " ==> Unpacked batch constituent finished: "
<< LogJob(J) << "\n";
auto r = taskFinished(
llvm::sys::ProcessInfo::InvalidPid, ReturnCode, Output, Errors,
TaskProcessInformation(llvm::sys::ProcessInfo::InvalidPid),
(void *)J);
if (r != TaskFinishedResponse::ContinueExecution)
res = r;
}
return res;
}
void
emitParseableOutputForEachFinishedJob(ProcessId Pid, int ReturnCode,
StringRef Output,
const Job *FinishedCmd,
TaskProcessInformation ProcInfo) {
FinishedCmd->forEachContainedJobAndPID(Pid, [&](const Job *J,
Job::PID P) {
if (jobIsCancelledBatchConstituent(ReturnCode, FinishedCmd, J)) {
// Simulate SIGINT-interruption to parseable-output consumer for any
// constituent of a failing batch job that produced no errors of its
// own.
parseable_output::emitSignalledMessage(llvm::errs(),
J->getSource().getClassName(),
"cancelled batch constituent",
"", SIGINT, P, ProcInfo);
} else {
parseable_output::emitFinishedMessage(llvm::errs(),
J->getSource().getClassName(),
Output.str(), ReturnCode,
P, ProcInfo);
}
});
}
/// Callback which will be called immediately after a task has finished
/// execution. Determines if execution should continue, and also schedule
/// any additional Jobs which we now know we need to run.
TaskFinishedResponse taskFinished(ProcessId Pid, int ReturnCode,
StringRef Output, StringRef Errors,
TaskProcessInformation ProcInfo,
void *Context) {
const Job *const FinishedCmd = (const Job *)Context;
if (Pid != llvm::sys::ProcessInfo::InvalidPid) {
if (Comp.getShowDriverTimeCompilation()) {
DriverTimers[FinishedCmd]->stopTimer();
}
processOutputOfFinishedProcess(Pid, ReturnCode, FinishedCmd, Output,
ProcInfo);
}
if (Comp.getStatsReporter() && ProcInfo.getResourceUsage().has_value())
Comp.getStatsReporter()->recordJobMaxRSS(
ProcInfo.getResourceUsage()->Maxrss);
if (isBatchJob(FinishedCmd)) {
return unpackAndFinishBatch(ReturnCode, Output, Errors,
static_cast<const BatchJob *>(FinishedCmd));
}
CommandSet DependentsInEffect =
subsequentJobsNeeded(FinishedCmd, ReturnCode);
if (ReturnCode != EXIT_SUCCESS)
return taskFailed(FinishedCmd, ReturnCode);
// When a task finishes, we need to reevaluate the other commands that
// might have been blocked.
markFinished(FinishedCmd);
noteBuildingJobs(DependentsInEffect,
"because of dependencies discovered later");
scheduleCommandsInSortedOrder(DependentsInEffect);
for (const Job *Cmd : DependentsInEffect) {
if (DeferredCommands.erase(Cmd)) {
#ifndef NDEBUG
if (isa<CompileJobAction>(FinishedCmd->getSource()))
Cmd->setWave(FinishedCmd->getWave() + 1);
#else
continue;
#endif
}
}
return TaskFinishedResponse::ContinueExecution;
}
TaskFinishedResponse taskFailed(const Job *FinishedCmd,
const int ReturnCode) {
// The task failed, so return true without performing any further
// dependency analysis.
// Store this task's ReturnCode as our Result if we haven't stored
// anything yet.
if (ResultCode == EXIT_SUCCESS)
ResultCode = ReturnCode;
if (!isa<CompileJobAction>(FinishedCmd->getSource()) ||
ReturnCode != EXIT_FAILURE) {
Comp.getDiags().diagnose(SourceLoc(), diag::error_command_failed,
FinishedCmd->getSource().getClassName(),
ReturnCode);
}
// See how ContinueBuildingAfterErrors gets set up in Driver.cpp for
// more info.
assert((Comp.getContinueBuildingAfterErrors() ||
!Comp.getBatchModeEnabled()) &&
"batch mode diagnostics require ContinueBuildingAfterErrors");
return Comp.getContinueBuildingAfterErrors()
? TaskFinishedResponse::ContinueExecution
: TaskFinishedResponse::StopExecution;
}
#if defined(_WIN32)
struct FileBinaryModeRAII {
FileBinaryModeRAII(FILE *F) : F(F) {
PrevMode = _setmode(_fileno(F), _O_BINARY);
}
~FileBinaryModeRAII() {
_setmode(_fileno(F), PrevMode);
}
FILE *F;
int PrevMode;
};
#else
struct FileBinaryModeRAII {
FileBinaryModeRAII(FILE *) {}
};
#endif
void processOutputOfFinishedProcess(ProcessId Pid, int ReturnCode,
const Job *const FinishedCmd,
StringRef Output,
TaskProcessInformation ProcInfo) {
switch (Comp.getOutputLevel()) {
case OutputLevel::PrintJobs:
// Only print the jobs, not the outputs
break;
case OutputLevel::Normal:
case OutputLevel::Verbose:
// Send the buffered output to stderr, though only if we
// support getting buffered output.
if (TaskQueue::supportsBufferingOutput()) {
// Temporarily change stderr to binary mode to avoid double
// LF -> CR LF conversions on the outputs from child
// processes, which have already this conversion appplied.
// This makes a difference only for Windows.
FileBinaryModeRAII F(stderr);
llvm::errs() << Output;
}
break;
case OutputLevel::Parseable:
emitParseableOutputForEachFinishedJob(Pid, ReturnCode, Output,
FinishedCmd, ProcInfo);
break;
}
}
/// In order to handle both old dependencies that have disappeared and new
/// dependencies that have arisen, we need to reload the dependency file.
/// Do this whether or not the build succeeded.
///
/// FIXME: too much global state floating around, e.g.
/// getIncrementalBuildEnabled
CommandSet subsequentJobsNeeded(const Job *FinishedCmd,
const int ReturnCode) {
if (!Comp.getIncrementalBuildEnabled())
return {};
auto Dependents = reloadAndRemarkDeps(FinishedCmd, ReturnCode);
CommandSet DepSet;
for (const Job *Cmd : Dependents)
DepSet.insert(Cmd);
return DepSet;
}
TaskFinishedResponse taskSignalled(ProcessId Pid, StringRef ErrorMsg,
StringRef Output, StringRef Errors,
void *Context,
llvm::Optional<int> Signal,
TaskProcessInformation ProcInfo) {
const Job *SignalledCmd = (const Job *)Context;
if (Comp.getShowDriverTimeCompilation()) {
DriverTimers[SignalledCmd]->stopTimer();
}
if (Comp.getOutputLevel() == OutputLevel::Parseable) {
// Parseable output was requested.
SignalledCmd->forEachContainedJobAndPID(Pid, [&](const Job *J,
Job::PID P) {
parseable_output::emitSignalledMessage(llvm::errs(),
J->getSource().getClassName(),
ErrorMsg, Output, Signal, P,
ProcInfo);
});
} else {
// Otherwise, send the buffered output to stderr, though only if we
// support getting buffered output.
if (TaskQueue::supportsBufferingOutput())
llvm::errs() << Output;
}
if (Comp.getStatsReporter() && ProcInfo.getResourceUsage().has_value())
Comp.getStatsReporter()->recordJobMaxRSS(
ProcInfo.getResourceUsage()->Maxrss);
if (!ErrorMsg.empty())
Comp.getDiags().diagnose(SourceLoc(),
diag::error_unable_to_execute_command,
ErrorMsg);
if (Signal.has_value()) {
Comp.getDiags().diagnose(SourceLoc(), diag::error_command_signalled,
SignalledCmd->getSource().getClassName(),
Signal.value());
} else {
Comp.getDiags()
.diagnose(SourceLoc(),
diag::error_command_signalled_without_signal_number,
SignalledCmd->getSource().getClassName());
}
// Since the task signalled, unconditionally set result to -2.
ResultCode = -2;
AnyAbnormalExit = true;
return TaskFinishedResponse::StopExecution;
}
public:
PerformJobsState(Compilation &Comp, std::unique_ptr<TaskQueue> &&TaskQueue)
: Comp(Comp),
FineGrainedDepGraph(
Comp.getVerifyFineGrainedDependencyGraphAfterEveryImport(),
Comp.getEmitFineGrainedDependencyDotFileAfterEveryImport(),
Comp.getTraceDependencies(),
Comp.getStatsReporter()),
TQ(std::move(TaskQueue)) {}
/// Schedule and run initial, additional, and batch jobs.
void runJobs() {
scheduleJobsBeforeBatching();
formBatchJobsAndAddPendingJobsToTaskQueue();
runTaskQueueToCompletion();
checkUnfinishedJobs();
}
private:
void scheduleJobsBeforeBatching() {
if (Comp.getIncrementalBuildEnabled())
scheduleFirstRoundJobsForIncrementalCompilation();
else
scheduleJobsForNonIncrementalCompilation();
}
void scheduleJobsForNonIncrementalCompilation() {
for (const Job *Cmd : Comp.getJobs())
scheduleCommandIfNecessaryAndPossible(Cmd);
}
void scheduleFirstRoundJobsForIncrementalCompilation() {
CommandSet compileJobsToSchedule =
computeFirstRoundCompileJobsForIncrementalCompilation();
for (const Job *Cmd : Comp.getJobs()) {
if (!isa<IncrementalJobAction>(Cmd->getSource()) ||
compileJobsToSchedule.count(Cmd)) {
scheduleCommandIfNecessaryAndPossible(Cmd);
noteBuilding(Cmd, /*willBeBuilding*/ true, "");
} else {
DeferredCommands.insert(Cmd);
noteBuilding(Cmd, /*willBeBuilding*/ false, "");
}
}
}
/// Figure out the best strategy and return those jobs. May return
/// duplicates.
CommandSet computeFirstRoundCompileJobsForIncrementalCompilation() {
auto getEveryCompileJob = [&] {
CommandSet everyIncrementalJob;
for (const Job *Cmd : Comp.getJobs()) {
if (isa<IncrementalJobAction>(Cmd->getSource()))
everyIncrementalJob.insert(Cmd);
}
return everyIncrementalJob;
};
bool sawModuleWrapJob = false;
const Job *mergeModulesJob = nullptr;
CommandSet jobsToSchedule;
CommandSet initialCascadingCommands;
for (const Job *cmd : Comp.getJobs()) {
// A modulewrap job consumes the output of merge-modules. If it is
// in the queue, we must run merge-modules or empty temporary files
// will be consumed by the job instead.
// FIXME: We should be able to ditch this if we compare the timestamps
// of the temporary file to the build record, if it exists.
sawModuleWrapJob |= isa<ModuleWrapJobAction>(cmd->getSource());
// Skip jobs that have no associated incremental info.
if (!isa<IncrementalJobAction>(cmd->getSource())) {
continue;
}
if (isa<MergeModuleJobAction>(cmd->getSource())) {
assert(!mergeModulesJob && "multiple scheduled merge-modules jobs?");
mergeModulesJob = cmd;
}
const llvm::Optional<std::pair<bool, bool>> shouldSchedAndIsCascading =
computeShouldInitiallyScheduleJobAndDependents(cmd);
if (!shouldSchedAndIsCascading)
return getEveryCompileJob(); // Load error, just run them all
const bool &shouldSchedule = shouldSchedAndIsCascading->first;
const bool &isCascading = shouldSchedAndIsCascading->second;
if (shouldSchedule)
jobsToSchedule.insert(cmd);
if (isCascading)
initialCascadingCommands.insert(cmd);
}
for (const auto *cmd : collectCascadedJobsFromDependencyGraph(
initialCascadingCommands))
jobsToSchedule.insert(cmd);
for (const auto cmd :
collectExternallyDependentJobsFromDependencyGraph())
jobsToSchedule.insert(cmd);
// The merge-modules job is special: it *must* be scheduled if any other
// job has been scheduled because any other job can influence the
// structure of the resulting module. Additionally, the initial scheduling
// predicate above is only aware of intra-module changes. External
// dependencies changing *must* cause merge-modules to be scheduled.
if ((!jobsToSchedule.empty() || sawModuleWrapJob) && mergeModulesJob) {
jobsToSchedule.insert(mergeModulesJob);
}
return jobsToSchedule;
}
/// Return whether \p Cmd should be scheduled when using dependencies, and if
/// the job is cascading. Or if there was a dependency-read error, return
/// \c None to indicate don't-know.
llvm::Optional<std::pair<bool, bool>>
computeShouldInitiallyScheduleJobAndDependents(const Job *Cmd) {
auto CondAndHasDepsIfNoError =
loadDependenciesAndComputeCondition(Cmd);
if (!CondAndHasDepsIfNoError)
return llvm::None; // swiftdeps read error, abandon dependencies
Job::Condition Cond;
bool HasDependenciesFileName;
std::tie(Cond, HasDependenciesFileName) =
CondAndHasDepsIfNoError.value();
const bool shouldSched = shouldScheduleCompileJobAccordingToCondition(
Cmd, Cond, HasDependenciesFileName);
const bool isCascading = isCascadingJobAccordingToCondition(
Cmd, Cond, HasDependenciesFileName);
return std::make_pair(shouldSched, isCascading);
}
/// Returns job condition, and whether a dependency file was specified.
/// But returns None if there was a dependency read error.
llvm::Optional<std::pair<Job::Condition, bool>>
loadDependenciesAndComputeCondition(const Job *const Cmd) {
// merge-modules Jobs do not have .swiftdeps files associated with them,
// however, their compilation condition is computed as a function of their
// inputs, so their condition can be used as normal.
if (isa<MergeModuleJobAction>(Cmd->getSource())) {
return std::make_pair(Cmd->getCondition(), true);
}
// Try to load the dependencies file for this job. If there isn't one, we
// always have to run the job, but it doesn't affect any other jobs. If
// there should be one but it's not present or can't be loaded, we have to
// run all the jobs.
// FIXME: We can probably do better here!