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IRGen.cpp
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//===--- IRGen.cpp - Swift LLVM IR Generation -----------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the entrypoints into IR generation.
//
//===----------------------------------------------------------------------===//
#include "../Serialization/ModuleFormat.h"
#include "IRGenModule.h"
#include "swift/ABI/MetadataValues.h"
#include "swift/AST/DiagnosticsIRGen.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/AST/IRGenRequests.h"
#include "swift/AST/LinkLibrary.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/SILGenRequests.h"
#include "swift/AST/SILOptimizerRequests.h"
#include "swift/AST/TBDGenRequests.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/Dwarf.h"
#include "swift/Basic/MD5Stream.h"
#include "swift/Basic/Platform.h"
#include "swift/Basic/Statistic.h"
#include "swift/Basic/Version.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/ClangImporter/ClangModule.h"
#include "swift/IRGen/IRGenPublic.h"
#include "swift/IRGen/IRGenSILPasses.h"
#include "swift/LLVMPasses/Passes.h"
#include "swift/LLVMPasses/PassesFwd.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILRemarkStreamer.h"
#include "swift/SILOptimizer/PassManager/PassManager.h"
#include "swift/SILOptimizer/PassManager/PassPipeline.h"
#include "swift/SILOptimizer/PassManager/Passes.h"
#include "swift/Subsystems.h"
#include "swift/TBDGen/TBDGen.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/CompilerInstance.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/Bitcode/BitcodeWriterPass.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Linker/Linker.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/StandardInstrumentations.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/Path.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Coroutines.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/AlwaysInliner.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
#include "llvm/Transforms/Instrumentation/InstrProfiling.h"
#include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
#include "llvm/Transforms/ObjCARC.h"
#include <thread>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
using namespace swift;
using namespace irgen;
using namespace llvm;
#define DEBUG_TYPE "irgen"
static cl::opt<bool> DisableObjCARCContract(
"disable-objc-arc-contract", cl::Hidden,
cl::desc("Disable running objc arc contract for testing purposes"));
// This option is for performance benchmarking: to ensure a consistent
// performance data, modules are aligned to the page size.
// Warning: this blows up the text segment size. So use this option only for
// performance benchmarking.
static cl::opt<bool> AlignModuleToPageSize(
"align-module-to-page-size", cl::Hidden,
cl::desc("Align the text section of all LLVM modules to the page size"));
namespace {
// We need this to access IRGenOptions from extension functions
class PassManagerBuilderWrapper : public PassManagerBuilder {
public:
const IRGenOptions &IRGOpts;
PassManagerBuilderWrapper(const IRGenOptions &IRGOpts)
: PassManagerBuilder(), IRGOpts(IRGOpts) {}
};
} // end anonymous namespace
static void addSwiftARCOptPass(const PassManagerBuilder &Builder,
PassManagerBase &PM) {
if (Builder.OptLevel > 0)
PM.add(createSwiftARCOptPass());
}
static void addSwiftContractPass(const PassManagerBuilder &Builder,
PassManagerBase &PM) {
if (Builder.OptLevel > 0)
PM.add(createSwiftARCContractPass());
}
static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,
legacy::PassManagerBase &PM) {
auto &BuilderWrapper =
static_cast<const PassManagerBuilderWrapper &>(Builder);
auto recover =
bool(BuilderWrapper.IRGOpts.SanitizersWithRecoveryInstrumentation &
SanitizerKind::Address);
auto useODRIndicator = BuilderWrapper.IRGOpts.SanitizeAddressUseODRIndicator;
PM.add(createAddressSanitizerFunctionPass(/*CompileKernel=*/false, recover));
PM.add(createModuleAddressSanitizerLegacyPassPass(
/*CompileKernel=*/false, recover, /*UseGlobalsGC=*/true,
useODRIndicator));
}
static void addThreadSanitizerPass(const PassManagerBuilder &Builder,
legacy::PassManagerBase &PM) {
PM.add(createThreadSanitizerLegacyPassPass());
}
static void addSwiftDbgAddrBlockSplitterPass(const PassManagerBuilder &Builder,
legacy::PassManagerBase &PM) {
PM.add(createSwiftDbgAddrBlockSplitter());
}
static void addSanitizerCoveragePass(const PassManagerBuilder &Builder,
legacy::PassManagerBase &PM) {
const PassManagerBuilderWrapper &BuilderWrapper =
static_cast<const PassManagerBuilderWrapper &>(Builder);
PM.add(createModuleSanitizerCoverageLegacyPassPass(
BuilderWrapper.IRGOpts.SanitizeCoverage));
}
std::tuple<llvm::TargetOptions, std::string, std::vector<std::string>,
std::string>
swift::getIRTargetOptions(const IRGenOptions &Opts, ASTContext &Ctx) {
// Things that maybe we should collect from the command line:
// - relocation model
// - code model
// FIXME: We should do this entirely through Clang, for consistency.
TargetOptions TargetOpts;
// Explicitly request debugger tuning for LLDB which is the default
// on Darwin platforms but not on others.
TargetOpts.DebuggerTuning = llvm::DebuggerKind::LLDB;
TargetOpts.FunctionSections = Opts.FunctionSections;
auto *Clang = static_cast<ClangImporter *>(Ctx.getClangModuleLoader());
// WebAssembly doesn't support atomics yet, see https://bugs.swift.org/browse/SR-12097
// for more details.
if (Clang->getTargetInfo().getTriple().isOSBinFormatWasm())
TargetOpts.ThreadModel = llvm::ThreadModel::Single;
if (Opts.EnableGlobalISel) {
TargetOpts.EnableGlobalISel = true;
TargetOpts.GlobalISelAbort = GlobalISelAbortMode::DisableWithDiag;
}
switch (Opts.SwiftAsyncFramePointer) {
case SwiftAsyncFramePointerKind::Never:
TargetOpts.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Never;
break;
case SwiftAsyncFramePointerKind::Auto:
TargetOpts.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::DeploymentBased;
break;
case SwiftAsyncFramePointerKind::Always:
TargetOpts.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Always;
break;
}
clang::TargetOptions &ClangOpts = Clang->getTargetInfo().getTargetOpts();
return std::make_tuple(TargetOpts, ClangOpts.CPU, ClangOpts.Features, ClangOpts.Triple);
}
void setModuleFlags(IRGenModule &IGM) {
auto *Module = IGM.getModule();
// These module flags don't affect code generation; they just let us
// error during LTO if the user tries to combine files across ABIs.
Module->addModuleFlag(llvm::Module::Error, "Swift Version",
IRGenModule::swiftVersion);
if (IGM.getOptions().VirtualFunctionElimination ||
IGM.getOptions().WitnessMethodElimination) {
Module->addModuleFlag(llvm::Module::Error, "Virtual Function Elim", 1);
}
}
static void align(llvm::Module *Module) {
// For performance benchmarking: Align the module to the page size by
// aligning the first function of the module.
unsigned pageSize =
#if HAVE_UNISTD_H
sysconf(_SC_PAGESIZE));
#else
4096; // Use a default value
#endif
for (auto I = Module->begin(), E = Module->end(); I != E; ++I) {
if (!I->isDeclaration()) {
I->setAlignment(llvm::MaybeAlign(pageSize));
break;
}
}
}
static void
performOptimizationsUsingLegacyPassManger(const IRGenOptions &Opts,
llvm::Module *Module,
llvm::TargetMachine *TargetMachine) {
// Set up a pipeline.
PassManagerBuilderWrapper PMBuilder(Opts);
if (Opts.shouldOptimize() && !Opts.DisableLLVMOptzns) {
PMBuilder.OptLevel = 2; // -Os
PMBuilder.SizeLevel = 1; // -Os
PMBuilder.Inliner = llvm::createFunctionInliningPass(200);
PMBuilder.SLPVectorize = true;
PMBuilder.LoopVectorize = true;
PMBuilder.MergeFunctions = true;
} else {
PMBuilder.OptLevel = 0;
if (!Opts.DisableLLVMOptzns)
PMBuilder.Inliner =
llvm::createAlwaysInlinerLegacyPass(/*insertlifetime*/false);
}
bool RunSwiftMergeFunctions = true;
// LLVM MergeFunctions and SwiftMergeFunctions don't understand that the
// string in the metadata on calls in @llvm.type.checked.load intrinsics is
// semantically meaningful, and mis-compile (mis-merge) unrelated functions.
if (Opts.VirtualFunctionElimination || Opts.WitnessMethodElimination) {
PMBuilder.MergeFunctions = false;
RunSwiftMergeFunctions = false;
}
bool RunSwiftSpecificLLVMOptzns =
!Opts.DisableSwiftSpecificLLVMOptzns && !Opts.DisableLLVMOptzns;
// If the optimizer is enabled, we run the ARCOpt pass in the scalar optimizer
// and the Contract pass as late as possible.
if (RunSwiftSpecificLLVMOptzns) {
PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,
addSwiftARCOptPass);
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addSwiftContractPass);
}
if (!Opts.DisableSwiftSpecificLLVMOptzns)
addCoroutinePassesToExtensionPoints(PMBuilder);
if (Opts.Sanitizers & SanitizerKind::Address) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addAddressSanitizerPasses);
PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
addAddressSanitizerPasses);
}
if (Opts.Sanitizers & SanitizerKind::Thread) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addThreadSanitizerPass);
PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
addThreadSanitizerPass);
}
if (Opts.SanitizeCoverage.CoverageType !=
llvm::SanitizerCoverageOptions::SCK_None) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addSanitizerCoveragePass);
PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
addSanitizerCoveragePass);
}
if (RunSwiftSpecificLLVMOptzns && RunSwiftMergeFunctions) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
[&](const PassManagerBuilder &Builder, PassManagerBase &PM) {
if (Builder.OptLevel > 0) {
const PointerAuthSchema &schema = Opts.PointerAuth.FunctionPointers;
unsigned key = (schema.isEnabled() ? schema.getKey() : 0);
PM.add(createLegacySwiftMergeFunctionsPass(schema.isEnabled(), key));
}
});
}
if (RunSwiftSpecificLLVMOptzns) {
PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
addSwiftDbgAddrBlockSplitterPass);
PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
addSwiftDbgAddrBlockSplitterPass);
}
// Configure the function passes.
legacy::FunctionPassManager FunctionPasses(Module);
FunctionPasses.add(createTargetTransformInfoWrapperPass(
TargetMachine->getTargetIRAnalysis()));
if (Opts.Verify)
FunctionPasses.add(createVerifierPass());
PMBuilder.populateFunctionPassManager(FunctionPasses);
// The PMBuilder only knows about LLVM AA passes. We should explicitly add
// the swift AA pass after the other ones.
if (RunSwiftSpecificLLVMOptzns) {
FunctionPasses.add(createSwiftAAWrapperPass());
FunctionPasses.add(createExternalAAWrapperPass([](Pass &P, Function &,
AAResults &AAR) {
if (auto *WrapperPass = P.getAnalysisIfAvailable<SwiftAAWrapperPass>())
AAR.addAAResult(WrapperPass->getResult());
}));
}
// Run the function passes.
FunctionPasses.doInitialization();
for (auto I = Module->begin(), E = Module->end(); I != E; ++I)
if (!I->isDeclaration())
FunctionPasses.run(*I);
FunctionPasses.doFinalization();
// Configure the module passes.
legacy::PassManager ModulePasses;
ModulePasses.add(createTargetTransformInfoWrapperPass(
TargetMachine->getTargetIRAnalysis()));
// If we're generating a profile, add the lowering pass now.
if (Opts.GenerateProfile) {
// TODO: Surface the option to emit atomic profile counter increments at
// the driver level.
InstrProfOptions Options;
Options.Atomic = bool(Opts.Sanitizers & SanitizerKind::Thread);
ModulePasses.add(createInstrProfilingLegacyPass(Options));
}
PMBuilder.populateModulePassManager(ModulePasses);
// The PMBuilder only knows about LLVM AA passes. We should explicitly add
// the swift AA pass after the other ones.
if (RunSwiftSpecificLLVMOptzns) {
ModulePasses.add(createSwiftAAWrapperPass());
ModulePasses.add(createExternalAAWrapperPass([](Pass &P, Function &,
AAResults &AAR) {
if (auto *WrapperPass = P.getAnalysisIfAvailable<SwiftAAWrapperPass>())
AAR.addAAResult(WrapperPass->getResult());
}));
}
if (Opts.Verify)
ModulePasses.add(createVerifierPass());
if (Opts.PrintInlineTree)
ModulePasses.add(createInlineTreePrinterPass());
// Make sure we do ARC contraction under optimization. We don't
// rely on any other LLVM ARC transformations, but we do need ARC
// contraction to add the objc_retainAutoreleasedReturnValue
// assembly markers and remove clang.arc.used.
if (Opts.shouldOptimize() && !DisableObjCARCContract &&
!Opts.DisableLLVMOptzns)
ModulePasses.add(createObjCARCContractPass());
// Do it.
ModulePasses.run(*Module);
if (AlignModuleToPageSize) {
align(Module);
}
}
static void
performOptimizationsUsingNewPassManger(const IRGenOptions &Opts,
llvm::Module *Module,
llvm::TargetMachine *TargetMachine) {
Optional<PGOOptions> PGOOpt;
PipelineTuningOptions PTO;
bool RunSwiftMergeFunctions = true;
// LLVM MergeFunctions and SwiftMergeFunctions don't understand that the
// string in the metadata on calls in @llvm.type.checked.load intrinsics is
// semantically meaningful, and mis-compile (mis-merge) unrelated functions.
if (Opts.VirtualFunctionElimination || Opts.WitnessMethodElimination) {
RunSwiftMergeFunctions = false;
}
bool RunSwiftSpecificLLVMOptzns =
!Opts.DisableSwiftSpecificLLVMOptzns && !Opts.DisableLLVMOptzns;
PTO.CallGraphProfile = false;
llvm::OptimizationLevel level = llvm::OptimizationLevel::O0;
if (Opts.shouldOptimize() && !Opts.DisableLLVMOptzns) {
// For historical reasons, loop interleaving is set to mirror setting for
// loop unrolling.
PTO.LoopInterleaving = true;
PTO.LoopVectorization = true;
PTO.SLPVectorization = true;
PTO.MergeFunctions = RunSwiftMergeFunctions;
level = llvm::OptimizationLevel::Os;
} else {
level = llvm::OptimizationLevel::O0;
}
LoopAnalysisManager LAM;
FunctionAnalysisManager FAM;
CGSCCAnalysisManager CGAM;
ModuleAnalysisManager MAM;
bool DebugPassStructure = false;
PassInstrumentationCallbacks PIC;
PrintPassOptions PrintPassOpts;
PrintPassOpts.Indent = DebugPassStructure;
PrintPassOpts.SkipAnalyses = DebugPassStructure;
StandardInstrumentations SI(DebugPassStructure, /*VerifyEach*/ false,
PrintPassOpts);
SI.registerCallbacks(PIC, &FAM);
PassBuilder PB(TargetMachine, PTO, PGOOpt, &PIC);
// Register the AA manager first so that our version is the one used.
FAM.registerPass([&] {
auto AA = PB.buildDefaultAAPipeline();
if (RunSwiftSpecificLLVMOptzns)
AA.registerFunctionAnalysis<SwiftAA>();
return AA;
});
FAM.registerPass([&] { return SwiftAA(); });
// Register all the basic analyses with the managers.
PB.registerModuleAnalyses(MAM);
PB.registerCGSCCAnalyses(CGAM);
PB.registerFunctionAnalyses(FAM);
PB.registerLoopAnalyses(LAM);
PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
ModulePassManager MPM;
if (RunSwiftSpecificLLVMOptzns) {
PB.registerScalarOptimizerLateEPCallback(
[](FunctionPassManager &FPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0)
FPM.addPass(SwiftARCOptPass());
});
PB.registerOptimizerLastEPCallback([](ModulePassManager &MPM,
OptimizationLevel Level) {
if (Level != OptimizationLevel::O0)
MPM.addPass(createModuleToFunctionPassAdaptor(SwiftARCContractPass()));
});
}
// PassBuilder adds coroutine passes per default.
//
if (Opts.Sanitizers & SanitizerKind::Address) {
PB.registerOptimizerLastEPCallback([&](ModulePassManager &MPM,
OptimizationLevel Level) {
auto Recover = bool(Opts.SanitizersWithRecoveryInstrumentation &
SanitizerKind::Address);
bool UseAfterScope = false;
bool ModuleUseAfterScope = true;
bool UseOdrIndicator = Opts.SanitizeAddressUseODRIndicator;
llvm::AsanDtorKind DestructorKind = llvm::AsanDtorKind::Global;
llvm::AsanDetectStackUseAfterReturnMode UseAfterReturn =
llvm::AsanDetectStackUseAfterReturnMode::Runtime;
MPM.addPass(
RequireAnalysisPass<ASanGlobalsMetadataAnalysis, llvm::Module>());
MPM.addPass(ModuleAddressSanitizerPass(false, Recover,
ModuleUseAfterScope,
UseOdrIndicator, DestructorKind));
MPM.addPass(createModuleToFunctionPassAdaptor(AddressSanitizerPass(
{false, Recover, UseAfterScope, UseAfterReturn})));
});
}
if (Opts.Sanitizers & SanitizerKind::Thread) {
PB.registerOptimizerLastEPCallback(
[&](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(ModuleThreadSanitizerPass());
MPM.addPass(createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
});
}
if (Opts.SanitizeCoverage.CoverageType !=
llvm::SanitizerCoverageOptions::SCK_None) {
PB.registerOptimizerLastEPCallback([&](ModulePassManager &MPM,
OptimizationLevel Level) {
std::vector<std::string> allowlistFiles;
std::vector<std::string> ignorelistFiles;
MPM.addPass(ModuleSanitizerCoveragePass(Opts.SanitizeCoverage,
allowlistFiles, ignorelistFiles));
});
}
if (RunSwiftSpecificLLVMOptzns && RunSwiftMergeFunctions) {
PB.registerOptimizerLastEPCallback(
[&](ModulePassManager &MPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0) {
const PointerAuthSchema &schema = Opts.PointerAuth.FunctionPointers;
unsigned key = (schema.isEnabled() ? schema.getKey() : 0);
MPM.addPass(SwiftMergeFunctionsPass(schema.isEnabled(), key));
}
});
}
if (RunSwiftSpecificLLVMOptzns) {
PB.registerOptimizerLastEPCallback([&](ModulePassManager &MPM,
OptimizationLevel Level) {
MPM.addPass(
createModuleToFunctionPassAdaptor(SwiftDbgAddrBlockSplitterPass()));
});
}
if (Opts.GenerateProfile) {
InstrProfOptions options;
options.Atomic = bool(Opts.Sanitizers & SanitizerKind::Thread);
PB.registerPipelineStartEPCallback(
[options](ModulePassManager &MPM, OptimizationLevel level) {
MPM.addPass(InstrProfiling(options, false));
});
}
if (!Opts.shouldOptimize() || Opts.DisableLLVMOptzns) {
MPM = PB.buildO0DefaultPipeline(level, false);
} else {
MPM = PB.buildPerModuleDefaultPipeline(level);
}
// Make sure we do ARC contraction under optimization. We don't
// rely on any other LLVM ARC transformations, but we do need ARC
// contraction to add the objc_retainAutoreleasedReturnValue
// assembly markers and remove clang.arc.used.
if (Opts.shouldOptimize() && !DisableObjCARCContract &&
!Opts.DisableLLVMOptzns)
MPM.addPass(createModuleToFunctionPassAdaptor(ObjCARCContractPass()));
if (Opts.Verify) {
// Run verification before we run the pipeline.
ModulePassManager VerifyPM;
VerifyPM.addPass(VerifierPass());
VerifyPM.run(*Module, MAM);
// PB.registerPipelineStartEPCallback(
// [](ModulePassManager &MPM, OptimizationLevel Level) {
// MPM.addPass(VerifierPass());
// });
// Run verification after we ran the pipeline;
MPM.addPass(VerifierPass());
}
if (Opts.PrintInlineTree)
MPM.addPass(InlineTreePrinterPass());
if (!Opts.DisableLLVMOptzns)
MPM.run(*Module, MAM);
if (AlignModuleToPageSize) {
align(Module);
}
}
void swift::performLLVMOptimizations(const IRGenOptions &Opts,
llvm::Module *Module,
llvm::TargetMachine *TargetMachine) {
if (Opts.LegacyPassManager)
performOptimizationsUsingLegacyPassManger(Opts, Module, TargetMachine);
else
performOptimizationsUsingNewPassManger(Opts, Module, TargetMachine);
}
/// Computes the MD5 hash of the llvm \p Module including the compiler version
/// and options which influence the compilation.
static MD5::MD5Result getHashOfModule(const IRGenOptions &Opts,
const llvm::Module *Module) {
// Calculate the hash of the whole llvm module.
MD5Stream HashStream;
llvm::WriteBitcodeToFile(*Module, HashStream);
// Update the hash with the compiler version. We want to recompile if the
// llvm pipeline of the compiler changed.
HashStream << version::getSwiftFullVersion();
// Add all options which influence the llvm compilation but are not yet
// reflected in the llvm module itself.
Opts.writeLLVMCodeGenOptionsTo(HashStream);
MD5::MD5Result result;
HashStream.final(result);
return result;
}
/// Returns false if the hash of the current module \p HashData matches the
/// hash which is stored in an existing output object file.
static bool needsRecompile(StringRef OutputFilename, ArrayRef<uint8_t> HashData,
llvm::GlobalVariable *HashGlobal,
llvm::sys::Mutex *DiagMutex) {
if (OutputFilename.empty())
return true;
auto BinaryOwner = object::createBinary(OutputFilename);
if (!BinaryOwner) {
consumeError(BinaryOwner.takeError());
return true;
}
auto *ObjectFile = dyn_cast<object::ObjectFile>(BinaryOwner->getBinary());
if (!ObjectFile)
return true;
StringRef HashSectionName = HashGlobal->getSection();
// Strip the segment name. For mach-o the GlobalVariable's section name format
// is <segment>,<section>.
size_t Comma = HashSectionName.find_last_of(',');
if (Comma != StringRef::npos)
HashSectionName = HashSectionName.substr(Comma + 1);
// Search for the section which holds the hash.
for (auto &Section : ObjectFile->sections()) {
llvm::Expected<StringRef> SectionNameOrErr = Section.getName();
if (!SectionNameOrErr) {
llvm::consumeError(SectionNameOrErr.takeError());
continue;
}
StringRef SectionName = *SectionNameOrErr;
if (SectionName == HashSectionName) {
llvm::Expected<llvm::StringRef> SectionData = Section.getContents();
if (!SectionData) {
return true;
}
ArrayRef<uint8_t> PrevHashData(
reinterpret_cast<const uint8_t *>(SectionData->data()),
SectionData->size());
LLVM_DEBUG(if (PrevHashData.size() == sizeof(MD5::MD5Result)) {
if (DiagMutex) DiagMutex->lock();
SmallString<32> HashStr;
MD5::stringifyResult(
*reinterpret_cast<MD5::MD5Result *>(
const_cast<unsigned char *>(PrevHashData.data())),
HashStr);
llvm::dbgs() << OutputFilename << ": prev MD5=" << HashStr <<
(HashData == PrevHashData ? " skipping\n" : " recompiling\n");
if (DiagMutex) DiagMutex->unlock();
});
if (HashData == PrevHashData)
return false;
return true;
}
}
return true;
}
static void countStatsPostIRGen(UnifiedStatsReporter &Stats,
const llvm::Module& Module) {
auto &C = Stats.getFrontendCounters();
// FIXME: calculate these in constant time if possible.
C.NumIRGlobals += Module.getGlobalList().size();
C.NumIRFunctions += Module.getFunctionList().size();
C.NumIRAliases += Module.getAliasList().size();
C.NumIRIFuncs += Module.getIFuncList().size();
C.NumIRNamedMetaData += Module.getNamedMDList().size();
C.NumIRValueSymbols += Module.getValueSymbolTable().size();
C.NumIRComdatSymbols += Module.getComdatSymbolTable().size();
for (auto const &Func : Module) {
for (auto const &BB : Func) {
++C.NumIRBasicBlocks;
C.NumIRInsts += BB.size();
}
}
}
template<typename ...ArgTypes>
void
diagnoseSync(DiagnosticEngine &Diags, llvm::sys::Mutex *DiagMutex,
SourceLoc Loc, Diag<ArgTypes...> ID,
typename swift::detail::PassArgument<ArgTypes>::type... Args) {
if (DiagMutex)
DiagMutex->lock();
Diags.diagnose(Loc, ID, std::move(Args)...);
if (DiagMutex)
DiagMutex->unlock();
}
/// Run the LLVM passes. In multi-threaded compilation this will be done for
/// multiple LLVM modules in parallel.
bool swift::performLLVM(const IRGenOptions &Opts,
DiagnosticEngine &Diags,
llvm::sys::Mutex *DiagMutex,
llvm::GlobalVariable *HashGlobal,
llvm::Module *Module,
llvm::TargetMachine *TargetMachine,
StringRef OutputFilename,
UnifiedStatsReporter *Stats) {
if (Opts.UseIncrementalLLVMCodeGen && HashGlobal) {
// Check if we can skip the llvm part of the compilation if we have an
// existing object file which was generated from the same llvm IR.
auto hash = getHashOfModule(Opts, Module);
LLVM_DEBUG(
if (DiagMutex) DiagMutex->lock();
SmallString<32> ResultStr;
MD5::stringifyResult(hash, ResultStr);
llvm::dbgs() << OutputFilename << ": MD5=" << ResultStr << '\n';
if (DiagMutex) DiagMutex->unlock();
);
ArrayRef<uint8_t> HashData(reinterpret_cast<uint8_t *>(&hash),
sizeof(hash));
if (Opts.OutputKind == IRGenOutputKind::ObjectFile &&
!Opts.PrintInlineTree &&
!needsRecompile(OutputFilename, HashData, HashGlobal, DiagMutex)) {
// The llvm IR did not change. We don't need to re-create the object file.
return false;
}
// Store the hash in the global variable so that it is written into the
// object file.
auto *HashConstant = ConstantDataArray::get(Module->getContext(), HashData);
HashGlobal->setInitializer(HashConstant);
}
Optional<raw_fd_ostream> RawOS;
if (!OutputFilename.empty()) {
// Try to open the output file. Clobbering an existing file is fine.
// Open in binary mode if we're doing binary output.
llvm::sys::fs::OpenFlags OSFlags = llvm::sys::fs::OF_None;
std::error_code EC;
RawOS.emplace(OutputFilename, EC, OSFlags);
if (RawOS->has_error() || EC) {
diagnoseSync(Diags, DiagMutex,
SourceLoc(), diag::error_opening_output,
OutputFilename, EC.message());
RawOS->clear_error();
return true;
}
if (Opts.OutputKind == IRGenOutputKind::LLVMAssemblyBeforeOptimization) {
Module->print(RawOS.getValue(), nullptr);
return false;
}
} else {
assert(Opts.OutputKind == IRGenOutputKind::Module && "no output specified");
}
performLLVMOptimizations(Opts, Module, TargetMachine);
if (Stats) {
if (DiagMutex)
DiagMutex->lock();
countStatsPostIRGen(*Stats, *Module);
if (DiagMutex)
DiagMutex->unlock();
}
if (!RawOS)
return false;
return compileAndWriteLLVM(Module, TargetMachine, Opts, Stats, Diags, *RawOS,
DiagMutex);
}
bool swift::compileAndWriteLLVM(llvm::Module *module,
llvm::TargetMachine *targetMachine,
const IRGenOptions &opts,
UnifiedStatsReporter *stats,
DiagnosticEngine &diags,
llvm::raw_pwrite_stream &out,
llvm::sys::Mutex *diagMutex) {
legacy::PassManager EmitPasses;
// Set up the final emission passes.
switch (opts.OutputKind) {
case IRGenOutputKind::LLVMAssemblyBeforeOptimization:
llvm_unreachable("Should be handled earlier.");
case IRGenOutputKind::Module:
break;
case IRGenOutputKind::LLVMAssemblyAfterOptimization:
EmitPasses.add(createPrintModulePass(out));
break;
case IRGenOutputKind::LLVMBitcode: {
if (opts.LLVMLTOKind == IRGenLLVMLTOKind::Thin) {
EmitPasses.add(createWriteThinLTOBitcodePass(out));
} else {
EmitPasses.add(createBitcodeWriterPass(out));
}
break;
}
case IRGenOutputKind::NativeAssembly:
case IRGenOutputKind::ObjectFile: {
CodeGenFileType FileType;
FileType =
(opts.OutputKind == IRGenOutputKind::NativeAssembly ? CGFT_AssemblyFile
: CGFT_ObjectFile);
EmitPasses.add(createTargetTransformInfoWrapperPass(
targetMachine->getTargetIRAnalysis()));
bool fail = targetMachine->addPassesToEmitFile(EmitPasses, out, nullptr,
FileType, !opts.Verify);
if (fail) {
diagnoseSync(diags, diagMutex, SourceLoc(),
diag::error_codegen_init_fail);
return true;
}
break;
}
}
EmitPasses.run(*module);
if (stats) {
if (diagMutex)
diagMutex->lock();
stats->getFrontendCounters().NumLLVMBytesOutput += out.tell();
if (diagMutex)
diagMutex->unlock();
}
return false;
}
static void setPointerAuthOptions(PointerAuthOptions &opts,
const clang::PointerAuthOptions &clangOpts){
// Intentionally do a slice-assignment to copy over the clang options.
static_cast<clang::PointerAuthOptions&>(opts) = clangOpts;
assert(clangOpts.FunctionPointers);
if (clangOpts.FunctionPointers.getKind() != PointerAuthSchema::Kind::ARM8_3)
return;
using Discrimination = PointerAuthSchema::Discrimination;
// A key suitable for code pointers that might be used anywhere in the ABI.
auto codeKey = clangOpts.FunctionPointers.getARM8_3Key();
// A key suitable for data pointers that might be used anywhere in the ABI.
// Using a data key for data pointers and vice-versa is important for
// ABI future-proofing.
auto dataKey = PointerAuthSchema::ARM8_3Key::ASDA;
// A key suitable for code pointers that are only used in private
// situations. Do not use this key for any sort of signature that
// might end up on a global constant initializer.
auto nonABICodeKey = PointerAuthSchema::ARM8_3Key::ASIB;
// A key suitable for data pointers that are only used in private
// situations. Do not use this key for any sort of signature that
// might end up on a global constant initializer.
auto nonABIDataKey = PointerAuthSchema::ARM8_3Key::ASDB;
// If you change anything here, be sure to update <ptrauth.h>.
opts.SwiftFunctionPointers =
PointerAuthSchema(codeKey, /*address*/ false, Discrimination::Type);
opts.KeyPaths =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.ValueWitnesses =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.ProtocolWitnesses =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.ProtocolAssociatedTypeAccessFunctions =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.ProtocolAssociatedTypeWitnessTableAccessFunctions =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.SwiftClassMethods =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.SwiftClassMethodPointers =
PointerAuthSchema(codeKey, /*address*/ false, Discrimination::Decl);
opts.HeapDestructors =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
// Partial-apply captures are not ABI and can use a more aggressive key.
opts.PartialApplyCapture =
PointerAuthSchema(nonABICodeKey, /*address*/ true, Discrimination::Decl);
opts.TypeDescriptors =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.TypeDescriptorsAsArguments =
PointerAuthSchema(dataKey, /*address*/ false, Discrimination::Decl);
opts.SwiftDynamicReplacements =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Decl);
opts.SwiftDynamicReplacementKeys =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.ProtocolConformanceDescriptors =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.ProtocolConformanceDescriptorsAsArguments =
PointerAuthSchema(dataKey, /*address*/ false, Discrimination::Decl);
// Coroutine resumption functions are never stored globally in the ABI,
// so we can do some things that aren't normally okay to do. However,
// we can't use ASIB because that would break ARM64 interoperation.
// The address used in the discrimination is not the address where the
// function pointer is signed, but the address of the coroutine buffer.
opts.YieldManyResumeFunctions =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Type);
opts.YieldOnceResumeFunctions =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Type);
opts.ResilientClassStubInitCallbacks =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::ResilientClassStubInitCallback);
opts.AsyncSwiftFunctionPointers =
PointerAuthSchema(dataKey, /*address*/ false, Discrimination::Type);
opts.AsyncSwiftClassMethods =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.AsyncProtocolWitnesses =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.AsyncSwiftClassMethodPointers =
PointerAuthSchema(dataKey, /*address*/ false, Discrimination::Decl);
opts.AsyncSwiftDynamicReplacements =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Decl);
opts.AsyncPartialApplyCapture =
PointerAuthSchema(nonABIDataKey, /*address*/ true, Discrimination::Decl);
opts.AsyncContextParent =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::AsyncContextParent);
opts.AsyncContextResume =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::AsyncContextResume);
opts.TaskResumeFunction =
PointerAuthSchema(codeKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::TaskResumeFunction);
opts.TaskResumeContext =
PointerAuthSchema(dataKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::TaskResumeContext);
opts.AsyncContextExtendedFrameEntry = PointerAuthSchema(
dataKey, /*address*/ true, Discrimination::Constant,
SpecialPointerAuthDiscriminators::SwiftAsyncContextExtendedFrameEntry);
opts.ExtendedExistentialTypeShape =
PointerAuthSchema(dataKey, /*address*/ false,
Discrimination::Constant,
SpecialPointerAuthDiscriminators
::ExtendedExistentialTypeShape);
opts.NonUniqueExtendedExistentialTypeShape =
PointerAuthSchema(dataKey, /*address*/ false,
Discrimination::Constant,
SpecialPointerAuthDiscriminators
::NonUniqueExtendedExistentialTypeShape);
}
std::unique_ptr<llvm::TargetMachine>
swift::createTargetMachine(const IRGenOptions &Opts, ASTContext &Ctx) {
CodeGenOpt::Level OptLevel = Opts.shouldOptimize()
? CodeGenOpt::Default // -Os
: CodeGenOpt::None;
// Set up TargetOptions and create the target features string.
TargetOptions TargetOpts;
std::string CPU;
std::string EffectiveClangTriple;
std::vector<std::string> targetFeaturesArray;
std::tie(TargetOpts, CPU, targetFeaturesArray, EffectiveClangTriple)
= getIRTargetOptions(Opts, Ctx);
const llvm::Triple &EffectiveTriple = llvm::Triple(EffectiveClangTriple);
std::string targetFeatures;
if (!targetFeaturesArray.empty()) {
llvm::SubtargetFeatures features;
for (const std::string &feature : targetFeaturesArray)