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Driver.cpp
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Driver.cpp
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//===--- Driver.cpp - Swift compiler driver -------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file contains implementations of parts of the compiler driver.
//
//===----------------------------------------------------------------------===//
#include "swift/Driver/Driver.h"
#include "ToolChains.h"
#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsDriver.h"
#include "swift/AST/DiagnosticsFrontend.h"
#include "swift/Basic/LLVM.h"
#include "swift/Basic/LangOptions.h"
#include "swift/Basic/OutputFileMap.h"
#include "swift/Basic/Platform.h"
#include "swift/Basic/Range.h"
#include "swift/Basic/Statistic.h"
#include "swift/Basic/TaskQueue.h"
#include "swift/Basic/Version.h"
#include "swift/Config.h"
#include "swift/Driver/Action.h"
#include "swift/Driver/Compilation.h"
#include "swift/Driver/Job.h"
#include "swift/Driver/PrettyStackTrace.h"
#include "swift/Driver/ToolChain.h"
#include "swift/Option/Options.h"
#include "swift/Option/SanitizerOptions.h"
#include "swift/Parse/Lexer.h"
#include "swift/Strings.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Config/config.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Remarks/RemarkFormat.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "CompilationRecord.h"
#include <memory>
using namespace swift;
using namespace swift::driver;
using namespace llvm::opt;
Driver::Driver(StringRef DriverExecutable,
StringRef Name,
ArrayRef<const char *> Args,
DiagnosticEngine &Diags)
: Opts(createSwiftOptTable()), Diags(Diags),
Name(Name), DriverExecutable(DriverExecutable),
DefaultTargetTriple(llvm::sys::getDefaultTargetTriple()) {
// The driver kind must be parsed prior to parsing arguments, since that
// affects how arguments are parsed.
parseDriverKind(Args.slice(1));
}
Driver::~Driver() = default;
void Driver::parseDriverKind(ArrayRef<const char *> Args) {
// The default driver kind is determined by Name.
StringRef DriverName = Name;
std::string OptName;
// However, the driver kind may be overridden if the first argument is
// --driver-mode.
if (!Args.empty()) {
OptName = getOpts().getOption(options::OPT_driver_mode).getPrefixedName();
StringRef FirstArg(Args[0]);
if (FirstArg.startswith(OptName))
DriverName = FirstArg.drop_front(OptName.size());
}
Optional<DriverKind> Kind =
llvm::StringSwitch<Optional<DriverKind>>(DriverName)
.Case("swift", DriverKind::Interactive)
.Case("swiftc", DriverKind::Batch)
.Case("swift-autolink-extract", DriverKind::AutolinkExtract)
.Case("swift-indent", DriverKind::SwiftIndent)
.Case("swift-symbolgraph-extract", DriverKind::SymbolGraph)
.Case("swift-api-extract", DriverKind::APIExtract)
.Case("swift-api-digester", DriverKind::APIDigester)
.Default(None);
if (Kind.has_value())
driverKind = Kind.value();
else if (!OptName.empty())
Diags.diagnose({}, diag::error_invalid_arg_value, OptName, DriverName);
}
ArrayRef<const char *> Driver::getArgsWithoutProgramNameAndDriverMode(
ArrayRef<const char *> Args) const {
Args = Args.slice(1);
if (Args.empty())
return Args;
const std::string OptName =
getOpts().getOption(options::OPT_driver_mode).getPrefixedName();
if (StringRef(Args[0]).startswith(OptName))
Args = Args.slice(1);
return Args;
}
static void validateBridgingHeaderArgs(DiagnosticEngine &diags,
const ArgList &args) {
if (!args.hasArgNoClaim(options::OPT_import_objc_header))
return;
if (args.hasArgNoClaim(options::OPT_import_underlying_module))
diags.diagnose({}, diag::error_framework_bridging_header);
if (args.hasArgNoClaim(options::OPT_emit_module_interface,
options::OPT_emit_module_interface_path)) {
diags.diagnose({}, diag::error_bridging_header_module_interface);
}
}
static void validateWarningControlArgs(DiagnosticEngine &diags,
const ArgList &args) {
if (args.hasArg(options::OPT_suppress_warnings) &&
args.hasFlag(options::OPT_warnings_as_errors,
options::OPT_no_warnings_as_errors, false)) {
diags.diagnose(SourceLoc(), diag::error_conflicting_options,
"-warnings-as-errors", "-suppress-warnings");
}
}
static void validateProfilingArgs(DiagnosticEngine &diags,
const ArgList &args) {
const Arg *ProfileGenerate = args.getLastArg(options::OPT_profile_generate);
const Arg *ProfileUse = args.getLastArg(options::OPT_profile_use);
if (ProfileGenerate && ProfileUse) {
diags.diagnose(SourceLoc(), diag::error_conflicting_options,
"-profile-generate", "-profile-use");
}
// Check if the profdata is missing
if (ProfileUse && !llvm::sys::fs::exists(ProfileUse->getValue())) {
diags.diagnose(SourceLoc(), diag::error_profile_missing,
ProfileUse->getValue());
}
}
static void validateDependencyScanningArgs(DiagnosticEngine &diags,
const ArgList &args) {
const Arg *ExternalDependencyMap =
args.getLastArg(options::OPT_placeholder_dependency_module_map);
const Arg *ScanDependencies = args.getLastArg(options::OPT_scan_dependencies);
const Arg *Prescan = args.getLastArg(options::OPT_import_prescan);
const Arg *SerializeCache =
args.getLastArg(options::OPT_serialize_dependency_scan_cache);
const Arg *ReuseCache =
args.getLastArg(options::OPT_reuse_dependency_scan_cache);
const Arg *CacheSerializationPath =
args.getLastArg(options::OPT_dependency_scan_cache_path);
if (ExternalDependencyMap && !ScanDependencies) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-placeholder-dependency-module-map-file",
"-scan-dependencies");
}
if (Prescan && !ScanDependencies) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-import-prescan", "-scan-dependencies");
}
if (Prescan && !ScanDependencies) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-import-prescan", "-scan-dependencies");
}
if (SerializeCache && !ScanDependencies) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-serialize-dependency-scan-cache", "-scan-dependencies");
}
if (ReuseCache && !ScanDependencies) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-load-dependency-scan-cache", "-scan-dependencies");
}
if (SerializeCache && !CacheSerializationPath) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-serialize-dependency-scan-cache",
"-dependency-scan-cache-path");
}
if (ReuseCache && !CacheSerializationPath) {
diags.diagnose(SourceLoc(), diag::error_requirement_not_met,
"-serialize-dependency-scan-cache",
"-dependency-scan-cache-path");
}
}
static void validateDebugInfoArgs(DiagnosticEngine &diags,
const ArgList &args) {
// Check for missing debug option when verifying debug info.
if (args.hasArg(options::OPT_verify_debug_info)) {
Arg *debugOpt = args.getLastArg(swift::options::OPT_g_Group);
if (!debugOpt || debugOpt->getOption().matches(swift::options::OPT_gnone)) {
diags.diagnose(SourceLoc(),
diag::verify_debug_info_requires_debug_option);
}
}
// Check for any -*-prefix-map options that aren't of the form
// 'original=remapped' (either side can be empty, however).
for (const Arg *A : args.filtered(options::OPT_debug_prefix_map,
options::OPT_coverage_prefix_map,
options::OPT_file_prefix_map)) {
StringRef val = A->getValue();
if (val.find('=') == StringRef::npos)
diags.diagnose(SourceLoc(), diag::error_opt_invalid_mapping,
A->getOption().getPrefixedName(), val);
}
}
static void validateVerifyIncrementalDependencyArgs(DiagnosticEngine &diags,
const ArgList &args) {
// No option? No problem!
if (!args.hasArg(options::OPT_verify_incremental_dependencies)) {
return;
}
// Make sure we see -incremental but not -wmo, no matter in what order they're
// in - the build systems can pass them both and just hope the last one wins.
if (args.hasArg(options::OPT_incremental) &&
!args.hasArg(options::OPT_whole_module_optimization)) {
return;
}
diags.diagnose(SourceLoc(),
diag::verify_incremental_dependencies_needs_incremental);
}
static void validateCompilationConditionArgs(DiagnosticEngine &diags,
const ArgList &args) {
for (const Arg *A : args.filtered(options::OPT_D)) {
StringRef name = A->getValue();
if (name.contains('=')) {
diags.diagnose(SourceLoc(),
diag::cannot_assign_value_to_conditional_compilation_flag,
name);
} else if (name.startswith("-D")) {
diags.diagnose(SourceLoc(), diag::redundant_prefix_compilation_flag,
name);
} else if (!Lexer::isIdentifier(name)) {
diags.diagnose(SourceLoc(), diag::invalid_conditional_compilation_flag,
name);
}
}
}
static void validateSearchPathArgs(DiagnosticEngine &diags,
const ArgList &args) {
for (const Arg *A : args.filtered(options::OPT_F, options::OPT_Fsystem)) {
StringRef name = A->getValue();
if (name.endswith(".framework") || name.endswith(".framework/"))
diags.diagnose(SourceLoc(),
diag::framework_search_path_includes_framework_extension,
name);
}
}
static void validateLinkArgs(DiagnosticEngine &diags, const ArgList &args) {
if (args.hasArg(options::OPT_experimental_hermetic_seal_at_link)) {
if (args.hasArg(options::OPT_enable_library_evolution)) {
diags.diagnose(SourceLoc(),
diag::error_hermetic_seal_cannot_have_library_evolution);
}
bool ltoOk = false;
if (const Arg *A = args.getLastArg(options::OPT_lto)) {
StringRef name = A->getValue();
if (name == "llvm-thin" || name == "llvm-full") {
ltoOk = true;
}
}
if (!ltoOk) {
diags.diagnose(SourceLoc(),
diag::error_hermetic_seal_requires_lto);
}
}
}
/// Perform miscellaneous early validation of arguments.
static void validateArgs(DiagnosticEngine &diags, const ArgList &args,
const llvm::Triple &T) {
validateBridgingHeaderArgs(diags, args);
validateWarningControlArgs(diags, args);
validateProfilingArgs(diags, args);
validateDependencyScanningArgs(diags, args);
validateDebugInfoArgs(diags, args);
validateCompilationConditionArgs(diags, args);
validateSearchPathArgs(diags, args);
validateVerifyIncrementalDependencyArgs(diags, args);
validateLinkArgs(diags, args);
}
std::unique_ptr<ToolChain>
Driver::buildToolChain(const llvm::opt::InputArgList &ArgList) {
if (const Arg *A = ArgList.getLastArg(options::OPT_target)) {
DefaultTargetTriple = llvm::Triple::normalize(A->getValue());
}
llvm::Triple target(DefaultTargetTriple);
// Backward compatibility hack: infer "simulator" environment for x86
// iOS/tvOS/watchOS.
if (tripleInfersSimulatorEnvironment(target)) {
// Set the simulator environment.
target.setEnvironment(llvm::Triple::EnvironmentType::Simulator);
auto newTargetTriple = target.normalize();
Diags.diagnose(SourceLoc(), diag::warning_inferred_simulator_target,
DefaultTargetTriple, newTargetTriple);
DefaultTargetTriple = newTargetTriple;
}
switch (target.getOS()) {
case llvm::Triple::IOS:
case llvm::Triple::TvOS:
case llvm::Triple::WatchOS:
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX: {
Optional<llvm::Triple> targetVariant;
if (const Arg *A = ArgList.getLastArg(options::OPT_target_variant))
targetVariant = llvm::Triple(llvm::Triple::normalize(A->getValue()));
return std::make_unique<toolchains::Darwin>(*this, target, targetVariant);
}
case llvm::Triple::Linux:
if (target.isAndroid())
return std::make_unique<toolchains::Android>(*this, target);
return std::make_unique<toolchains::GenericUnix>(*this, target);
case llvm::Triple::FreeBSD:
return std::make_unique<toolchains::FreeBSD>(*this, target);
case llvm::Triple::OpenBSD:
return std::make_unique<toolchains::OpenBSD>(*this, target);
case llvm::Triple::Win32:
if (target.isWindowsCygwinEnvironment())
return std::make_unique<toolchains::Cygwin>(*this, target);
return std::make_unique<toolchains::Windows>(*this, target);
case llvm::Triple::Haiku:
return std::make_unique<toolchains::GenericUnix>(*this, target);
case llvm::Triple::WASI:
return std::make_unique<toolchains::GenericUnix>(*this, target);
default:
Diags.diagnose(SourceLoc(), diag::error_unknown_target,
ArgList.getLastArg(options::OPT_target)->getValue());
break;
}
return nullptr;
}
std::unique_ptr<sys::TaskQueue> Driver::buildTaskQueue(const Compilation &C) {
const auto &ArgList = C.getArgs();
unsigned NumberOfParallelCommands = 1;
if (const Arg *A = ArgList.getLastArg(options::OPT_j)) {
if (StringRef(A->getValue()).getAsInteger(10, NumberOfParallelCommands)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(ArgList), A->getValue());
return nullptr;
}
}
if (environmentVariableRequestedMaximumDeterminism()) {
NumberOfParallelCommands = 1;
Diags.diagnose(SourceLoc(), diag::remark_max_determinism_overriding,
"-j");
}
const bool DriverSkipExecution =
ArgList.hasArg(options::OPT_driver_skip_execution,
options::OPT_driver_print_jobs);
if (DriverSkipExecution) {
return std::make_unique<sys::DummyTaskQueue>(NumberOfParallelCommands);
} else {
return std::make_unique<sys::TaskQueue>(NumberOfParallelCommands,
C.getStatsReporter());
}
}
static void computeArgsHash(SmallString<32> &out, const DerivedArgList &args) {
SmallVector<const Arg *, 32> interestingArgs;
interestingArgs.reserve(args.size());
std::copy_if(args.begin(), args.end(), std::back_inserter(interestingArgs),
[](const Arg *arg) {
return !arg->getOption().hasFlag(options::DoesNotAffectIncrementalBuild) &&
arg->getOption().getKind() != Option::InputClass;
});
llvm::array_pod_sort(interestingArgs.begin(), interestingArgs.end(),
[](const Arg * const *lhs, const Arg * const *rhs)->int {
auto cmpID = (*lhs)->getOption().getID() - (*rhs)->getOption().getID();
if (cmpID != 0)
return cmpID;
return (*lhs)->getIndex() - (*rhs)->getIndex();
});
llvm::MD5 hash;
for (const Arg *arg : interestingArgs) {
hash.update(arg->getOption().getID());
for (const char *value : const_cast<Arg *>(arg)->getValues())
hash.update(value);
}
llvm::MD5::MD5Result hashBuf;
hash.final(hashBuf);
llvm::MD5::stringifyResult(hashBuf, out);
}
class Driver::InputInfoMap
: public llvm::SmallDenseMap<const Arg *, CompileJobAction::InputInfo, 16> {
};
using InputInfoMap = Driver::InputInfoMap;
/// Get the filename for build record. Returns true if failed.
static bool getCompilationRecordPath(std::string &buildRecordPath,
const OutputInfo &OI,
const Optional<OutputFileMap> &OFM,
DiagnosticEngine *Diags) {
if (!OFM) {
// FIXME: This should work without an output file map. We should have
// another way to specify a build record and where to put intermediates.
if (Diags)
Diags->diagnose(SourceLoc(), diag::incremental_requires_output_file_map);
return true;
}
if (auto *masterOutputMap = OFM->getOutputMapForSingleOutput())
buildRecordPath = masterOutputMap->lookup(file_types::TY_SwiftDeps);
if (buildRecordPath.empty()) {
if (Diags)
Diags->diagnose(SourceLoc(),
diag::incremental_requires_build_record_entry,
file_types::getTypeName(file_types::TY_SwiftDeps));
return true;
}
return false;
}
static std::string failedToReadOutOfDateMap(bool ShowIncrementalBuildDecisions,
StringRef buildRecordPath,
StringRef reason = "") {
std::string why = "malformed build record file";
if (!reason.empty()) {
why += " ";
why += reason;
}
if (ShowIncrementalBuildDecisions) {
llvm::outs() << "Incremental compilation has been disabled due to " << why
<< " '" << buildRecordPath << "'.\n";
}
return why;
}
static SmallVector<StringRef, 8> findRemovedInputs(
const InputFileList &inputs,
const llvm::StringMap<CompileJobAction::InputInfo> &previousInputs);
static void dealWithRemovedInputs(ArrayRef<StringRef> removedInputs,
bool ShowIncrementalBuildDecisions);
/// Returns why ignore incrementality
static std::string
populateOutOfDateMap(InputInfoMap &map, llvm::sys::TimePoint<> &LastBuildTime,
StringRef argsHashStr, const InputFileList &inputs,
StringRef buildRecordPath,
const bool ShowIncrementalBuildDecisions) {
// Treat a missing file as "no previous build".
auto buffer = llvm::MemoryBuffer::getFile(buildRecordPath);
if (!buffer) {
if (ShowIncrementalBuildDecisions)
llvm::outs() << "Incremental compilation could not read build record.\n";
return "could not read build record";
}
namespace yaml = llvm::yaml;
using InputInfo = CompileJobAction::InputInfo;
llvm::SourceMgr SM;
yaml::Stream stream(buffer.get()->getMemBufferRef(), SM);
auto I = stream.begin();
if (I == stream.end() || !I->getRoot())
return failedToReadOutOfDateMap(ShowIncrementalBuildDecisions,
buildRecordPath);
auto *topLevelMap = dyn_cast<yaml::MappingNode>(I->getRoot());
if (!topLevelMap)
return failedToReadOutOfDateMap(ShowIncrementalBuildDecisions,
buildRecordPath);
SmallString<64> scratch;
llvm::StringMap<InputInfo> previousInputs;
bool versionValid = false;
bool optionsMatch = true;
auto readTimeValue = [&scratch](yaml::Node *node,
llvm::sys::TimePoint<> &timeValue) -> bool {
auto *seq = dyn_cast<yaml::SequenceNode>(node);
if (!seq)
return true;
auto seqI = seq->begin(), seqE = seq->end();
if (seqI == seqE)
return true;
auto *secondsRaw = dyn_cast<yaml::ScalarNode>(&*seqI);
if (!secondsRaw)
return true;
std::time_t parsedSeconds;
if (secondsRaw->getValue(scratch).getAsInteger(10, parsedSeconds))
return true;
++seqI;
if (seqI == seqE)
return true;
auto *nanosecondsRaw = dyn_cast<yaml::ScalarNode>(&*seqI);
if (!nanosecondsRaw)
return true;
std::chrono::system_clock::rep parsedNanoseconds;
if (nanosecondsRaw->getValue(scratch).getAsInteger(10, parsedNanoseconds))
return true;
++seqI;
if (seqI != seqE)
return true;
timeValue = llvm::sys::TimePoint<>(std::chrono::seconds(parsedSeconds));
timeValue += std::chrono::nanoseconds(parsedNanoseconds);
return false;
};
// FIXME: LLVM's YAML support does incremental parsing in such a way that
// for-range loops break.
SmallString<64> CompilationRecordSwiftVersion;
for (auto i = topLevelMap->begin(), e = topLevelMap->end(); i != e; ++i) {
auto *key = cast<yaml::ScalarNode>(i->getKey());
StringRef keyStr = key->getValue(scratch);
using compilation_record::TopLevelKey;
if (keyStr == compilation_record::getName(TopLevelKey::Version)) {
auto *value = dyn_cast<yaml::ScalarNode>(i->getValue());
if (!value) {
auto reason = ("Malformed value for key '" + keyStr + "'.")
.toStringRef(scratch);
return failedToReadOutOfDateMap(ShowIncrementalBuildDecisions,
buildRecordPath, reason);
}
// NB: We check against
// swift::version::Version::getCurrentLanguageVersion() here because any
// -swift-version argument is handled in the argsHashStr check that
// follows.
CompilationRecordSwiftVersion = value->getValue(scratch);
versionValid = (CompilationRecordSwiftVersion
== version::getSwiftFullVersion(
version::Version::getCurrentLanguageVersion()));
} else if (keyStr == compilation_record::getName(TopLevelKey::Options)) {
auto *value = dyn_cast<yaml::ScalarNode>(i->getValue());
if (!value)
return "no name node in build record";
optionsMatch = (argsHashStr == value->getValue(scratch));
} else if (keyStr == compilation_record::getName(TopLevelKey::BuildTime)) {
auto *value = dyn_cast<yaml::SequenceNode>(i->getValue());
if (!value) {
auto reason = ("Malformed value for key '" + keyStr + "'.")
.toStringRef(scratch);
return failedToReadOutOfDateMap(ShowIncrementalBuildDecisions,
buildRecordPath, reason);
}
llvm::sys::TimePoint<> timeVal;
if (readTimeValue(i->getValue(), timeVal))
return "could not read time value in build record";
LastBuildTime = timeVal;
} else if (keyStr == compilation_record::getName(TopLevelKey::Inputs)) {
auto *inputMap = dyn_cast<yaml::MappingNode>(i->getValue());
if (!inputMap) {
auto reason = ("Malformed value for key '" + keyStr + "'.")
.toStringRef(scratch);
return failedToReadOutOfDateMap(ShowIncrementalBuildDecisions,
buildRecordPath, reason);
}
// FIXME: LLVM's YAML support does incremental parsing in such a way that
// for-range loops break.
for (auto i = inputMap->begin(), e = inputMap->end(); i != e; ++i) {
auto *key = dyn_cast<yaml::ScalarNode>(i->getKey());
if (!key)
return "no input entry in build record";
auto *value = dyn_cast<yaml::SequenceNode>(i->getValue());
if (!value)
return "no sequence node for input entry in build record";
using compilation_record::getInfoStatusForIdentifier;
auto previousBuildState =
getInfoStatusForIdentifier(value->getRawTag());
if (!previousBuildState)
return "no previous build state in build record";
llvm::sys::TimePoint<> timeValue;
if (readTimeValue(value, timeValue))
return "could not read time value in build record";
auto inputName = key->getValue(scratch);
previousInputs[inputName] = { *previousBuildState, timeValue };
}
}
}
if (!versionValid) {
if (ShowIncrementalBuildDecisions) {
auto v = version::getSwiftFullVersion(
version::Version::getCurrentLanguageVersion());
llvm::outs() << "Incremental compilation has been disabled, due to a "
<< "compiler version mismatch.\n"
<< "\tCompiling with: " << v << "\n"
<< "\tPreviously compiled with: "
<< CompilationRecordSwiftVersion << "\n";
}
return "compiler version mismatch";
}
if (!optionsMatch) {
if (ShowIncrementalBuildDecisions) {
llvm::outs() << "Incremental compilation has been disabled, because "
<< "different arguments were passed to the compiler.\n";
}
return "different arguments passed to compiler";
}
unsigned numMatchingPreviouslyCompiledInputs = 0;
for (auto &inputPair : inputs) {
auto iter = previousInputs.find(inputPair.second->getValue());
if (iter == previousInputs.end())
map[inputPair.second] = CompileJobAction::InputInfo::makeNewlyAdded();
else {
map[inputPair.second] = iter->getValue();
++numMatchingPreviouslyCompiledInputs;
}
}
assert(numMatchingPreviouslyCompiledInputs <= previousInputs.size());
auto const wereAnyInputsRemoved =
numMatchingPreviouslyCompiledInputs < previousInputs.size();
if (!wereAnyInputsRemoved)
return "";
const auto removedInputs = findRemovedInputs(inputs, previousInputs);
assert(!removedInputs.empty());
dealWithRemovedInputs(removedInputs, ShowIncrementalBuildDecisions);
return "an input was removed"; // recompile everything; could do better
// someday
}
static SmallVector<StringRef, 8> findRemovedInputs(
const InputFileList &inputs,
const llvm::StringMap<CompileJobAction::InputInfo> &previousInputs) {
llvm::DenseSet<StringRef> inputArgs;
for (auto &inputPair : inputs) {
inputArgs.insert(inputPair.second->getValue());
}
SmallVector<StringRef, 8> missingInputs;
for (auto &previousInput : previousInputs) {
auto previousInputArg = previousInput.getKey();
if (!inputArgs.contains(previousInputArg)) {
missingInputs.push_back(previousInputArg);
}
}
return missingInputs;
}
static void showRemovedInputs(ArrayRef<StringRef> removedInputs);
/// Return true if hadError
static void dealWithRemovedInputs(ArrayRef<StringRef> removedInputs,
const bool ShowIncrementalBuildDecisions) {
// If a file was removed, we've lost its dependency info. Rebuild everything.
// FIXME: Can we do better?
if (ShowIncrementalBuildDecisions)
showRemovedInputs(removedInputs);
}
static void showRemovedInputs(ArrayRef<StringRef> removedInputs) {
llvm::outs() << "Incremental compilation has been disabled, because "
<< "the following inputs were used in the previous "
<< "compilation, but not in the current compilation:\n";
for (auto &missing : removedInputs)
llvm::outs() << "\t" << missing << "\n";
}
// warn if -embed-bitcode is set and the output type is not an object
static void validateEmbedBitcode(DerivedArgList &Args, const OutputInfo &OI,
DiagnosticEngine &Diags) {
if (Args.hasArg(options::OPT_embed_bitcode) &&
OI.CompilerOutputType != file_types::TY_Object) {
Diags.diagnose(SourceLoc(), diag::warn_ignore_embed_bitcode);
Args.eraseArg(options::OPT_embed_bitcode);
}
if (Args.hasArg(options::OPT_embed_bitcode_marker) &&
OI.CompilerOutputType != file_types::TY_Object) {
Diags.diagnose(SourceLoc(), diag::warn_ignore_embed_bitcode_marker);
Args.eraseArg(options::OPT_embed_bitcode_marker);
}
}
/// Gets the filelist threshold to use. Diagnoses and returns true on error.
static bool getFilelistThreshold(DerivedArgList &Args, size_t &FilelistThreshold,
DiagnosticEngine &Diags) {
FilelistThreshold = 128;
// claim and diagnose deprecated -driver-use-filelists
bool HasUseFilelists = Args.hasArg(options::OPT_driver_use_filelists);
if (HasUseFilelists)
Diags.diagnose(SourceLoc(), diag::warn_use_filelists_deprecated);
if (const Arg *A = Args.getLastArg(options::OPT_driver_filelist_threshold)) {
// Use the supplied threshold
if (StringRef(A->getValue()).getAsInteger(10, FilelistThreshold)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(Args), A->getValue());
return true;
}
} else if (HasUseFilelists) {
// Treat -driver-use-filelists as -driver-filelist-threshold=0
FilelistThreshold = 0;
} // else stick with the default
return false;
}
static unsigned
getDriverBatchSeed(llvm::opt::InputArgList &ArgList,
DiagnosticEngine &Diags) {
unsigned DriverBatchSeed = 0;
if (const Arg *A = ArgList.getLastArg(options::OPT_driver_batch_seed)) {
if (StringRef(A->getValue()).getAsInteger(10, DriverBatchSeed)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(ArgList), A->getValue());
}
}
return DriverBatchSeed;
}
static Optional<unsigned>
getDriverBatchCount(llvm::opt::InputArgList &ArgList,
DiagnosticEngine &Diags)
{
if (const Arg *A = ArgList.getLastArg(options::OPT_driver_batch_count)) {
unsigned Count = 0;
if (StringRef(A->getValue()).getAsInteger(10, Count)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(ArgList), A->getValue());
} else {
return Count;
}
}
return None;
}
static bool computeIncremental(const llvm::opt::InputArgList *ArgList,
const bool ShowIncrementalBuildDecisions) {
if (!ArgList->hasArg(options::OPT_incremental))
return false;
const char *ReasonToDisable =
ArgList->hasFlag(options::OPT_whole_module_optimization,
options::OPT_no_whole_module_optimization,
false)
? "is not compatible with whole module optimization."
: ArgList->hasArg(options::OPT_embed_bitcode)
? "is not currently compatible with embedding LLVM IR bitcode."
: nullptr;
if (!ReasonToDisable)
return true;
if (ShowIncrementalBuildDecisions) {
llvm::outs() << "Incremental compilation has been disabled, because it "
<< ReasonToDisable
<< "\n";
}
return false;
}
static std::string
computeWorkingDirectory(const llvm::opt::InputArgList *ArgList) {
if (auto *A = ArgList->getLastArg(options::OPT_working_directory)) {
SmallString<128> workingDirectory;
workingDirectory = A->getValue();
llvm::sys::fs::make_absolute(workingDirectory);
std::string result = workingDirectory.str().str();
return result;
}
return std::string();
}
static std::unique_ptr<UnifiedStatsReporter>
createStatsReporter(const llvm::opt::InputArgList *ArgList,
const InputFileList &Inputs, const OutputInfo OI,
StringRef DefaultTargetTriple) {
const Arg *A = ArgList->getLastArgNoClaim(options::OPT_stats_output_dir);
if (!A)
return nullptr;
StringRef OptType;
if (const Arg *OptA = ArgList->getLastArgNoClaim(options::OPT_O_Group)) {
OptType = OptA->getSpelling();
}
StringRef InputName;
if (Inputs.size() == 1) {
InputName = Inputs[0].second->getSpelling();
}
StringRef OutputType = file_types::getExtension(OI.CompilerOutputType);
return std::make_unique<UnifiedStatsReporter>("swift-driver",
OI.ModuleName,
InputName,
DefaultTargetTriple,
OutputType,
OptType,
A->getValue());
}
static bool
computeContinueBuildingAfterErrors(const bool BatchMode,
const llvm::opt::InputArgList *ArgList) {
// Note: Batch mode handling of serialized diagnostics requires that all
// batches get to run, in order to make sure that all diagnostics emitted
// during the compilation end up in at least one serialized diagnostic file.
// Therefore, treat batch mode as implying -continue-building-after-errors.
// (This behavior could be limited to only when serialized diagnostics are
// being emitted, but this seems more consistent and less surprising for
// users.)
// FIXME: We don't really need (or want) a full ContinueBuildingAfterErrors.
// If we fail to precompile a bridging header, for example, there's no need
// to go on to compilation of source files, and if compilation of source files
// fails, we shouldn't try to link. Instead, we'd want to let all jobs finish
// but not schedule any new ones.
return BatchMode ||
ArgList->hasArg(options::OPT_continue_building_after_errors);
}
static Optional<unsigned>
getDriverBatchSizeLimit(llvm::opt::InputArgList &ArgList,
DiagnosticEngine &Diags)
{
if (const Arg *A = ArgList.getLastArg(options::OPT_driver_batch_size_limit)) {
unsigned Limit = 0;
if (StringRef(A->getValue()).getAsInteger(10, Limit)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
A->getAsString(ArgList), A->getValue());
} else {
return Limit;
}
}
return None;
}
std::unique_ptr<Compilation>
Driver::buildCompilation(const ToolChain &TC,
std::unique_ptr<llvm::opt::InputArgList> ArgList,
bool AllowErrors) {
llvm::PrettyStackTraceString CrashInfo("Compilation construction");
llvm::sys::TimePoint<> StartTime = std::chrono::system_clock::now();
// Claim --driver-mode here, since it's already been handled.
(void) ArgList->hasArg(options::OPT_driver_mode);
DriverPrintBindings = ArgList->hasArg(options::OPT_driver_print_bindings);
const std::string workingDirectory = computeWorkingDirectory(ArgList.get());
std::unique_ptr<DerivedArgList> TranslatedArgList(
translateInputAndPathArgs(*ArgList, workingDirectory));
validateArgs(Diags, *TranslatedArgList, TC.getTriple());
// Perform toolchain specific args validation.
TC.validateArguments(Diags, *TranslatedArgList, DefaultTargetTriple);
if (Diags.hadAnyError() && !AllowErrors)
return nullptr;
if (!handleImmediateArgs(*TranslatedArgList, TC)) {
return nullptr;
}
// Construct the list of inputs.
InputFileList Inputs;
buildInputs(TC, *TranslatedArgList, Inputs);
if (Diags.hadAnyError() && !AllowErrors)
return nullptr;
// Determine the OutputInfo for the driver.
OutputInfo OI;
bool BatchMode = false;
OI.CompilerMode = computeCompilerMode(*TranslatedArgList, Inputs, BatchMode);
buildOutputInfo(TC, *TranslatedArgList, BatchMode, Inputs, OI);
if (Diags.hadAnyError() && !AllowErrors)
return nullptr;
assert(OI.CompilerOutputType != file_types::ID::TY_INVALID &&
"buildOutputInfo() must set a valid output type!");
TC.validateOutputInfo(Diags, OI);
if (Diags.hadAnyError() && !AllowErrors)
return nullptr;
validateEmbedBitcode(*TranslatedArgList, OI, Diags);
if (OI.CompilerMode == OutputInfo::Mode::REPL)
// REPL mode expects no input files, so suppress the error.
SuppressNoInputFilesError = true;
Optional<OutputFileMap> OFM = buildOutputFileMap(
*TranslatedArgList, workingDirectory);
if (Diags.hadAnyError() && !AllowErrors)
return nullptr;
if (ArgList->hasArg(options::OPT_driver_print_output_file_map)) {
if (OFM)
OFM->dump(llvm::errs(), true);
else
Diags.diagnose(SourceLoc(), diag::error_no_output_file_map_specified);
if (!AllowErrors) {
return nullptr;
}
}
const bool ShowIncrementalBuildDecisions =
ArgList->hasArg(options::OPT_driver_show_incremental);
const bool Incremental =
computeIncremental(ArgList.get(), ShowIncrementalBuildDecisions);
std::string buildRecordPath;
getCompilationRecordPath(buildRecordPath,
OI, OFM, Incremental ? &Diags : nullptr);
SmallString<32> ArgsHash;
computeArgsHash(ArgsHash, *TranslatedArgList);
llvm::sys::TimePoint<> LastBuildTime = llvm::sys::TimePoint<>::min();
InputInfoMap outOfDateMap;
std::string whyIgnoreIncrementality =
!Incremental
? ""
: buildRecordPath.empty()
? "no build record path"
: populateOutOfDateMap(outOfDateMap, LastBuildTime, ArgsHash,
Inputs, buildRecordPath,
ShowIncrementalBuildDecisions);
// FIXME: Distinguish errors from "file removed", which is benign.
size_t DriverFilelistThreshold;
if (getFilelistThreshold(*TranslatedArgList, DriverFilelistThreshold, Diags))
return nullptr;
OutputLevel Level = OutputLevel::Normal;
if (const Arg *A =
ArgList->getLastArg(options::OPT_driver_print_jobs, options::OPT_v,
options::OPT_parseable_output)) {
if (A->getOption().matches(options::OPT_driver_print_jobs))