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BackendUtil.cpp
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BackendUtil.cpp
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//===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/CodeGen/BackendUtil.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetOptions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/Bitcode/BitcodeWriterPass.h"
#include "llvm/CodeGen/RegAllocRegistry.h"
#include "llvm/CodeGen/SchedulerRegistry.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ModuleSummaryIndex.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRPrinter/IRPrintingPasses.h"
#include "llvm/LTO/LTOBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/OffloadBinary.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Passes/StandardInstrumentations.h"
#include "llvm/Support/BuryPointer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/TimeProfiler.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/TargetParser/Triple.h"
#include "llvm/Transforms/IPO/LowerTypeTests.h"
#include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizerOptions.h"
#include "llvm/Transforms/Instrumentation/BoundsChecking.h"
#include "llvm/Transforms/Instrumentation/DataFlowSanitizer.h"
#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
#include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
#include "llvm/Transforms/Instrumentation/InstrProfiling.h"
#include "llvm/Transforms/Instrumentation/KCFI.h"
#include "llvm/Transforms/Instrumentation/MemProfiler.h"
#include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
#include "llvm/Transforms/Instrumentation/SanitizerBinaryMetadata.h"
#include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
#include "llvm/Transforms/ObjCARC.h"
#include "llvm/Transforms/Scalar/EarlyCSE.h"
#include "llvm/Transforms/Scalar/GVN.h"
#include "llvm/Transforms/Scalar/JumpThreading.h"
#include "llvm/Transforms/Utils/Debugify.h"
#include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
#include <memory>
#include <optional>
using namespace clang;
using namespace llvm;
#define HANDLE_EXTENSION(Ext) \
llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
#include "llvm/Support/Extension.def"
namespace llvm {
extern cl::opt<bool> DebugInfoCorrelate;
// Experiment to move sanitizers earlier.
static cl::opt<bool> ClSanitizeOnOptimizerEarlyEP(
"sanitizer-early-opt-ep", cl::Optional,
cl::desc("Insert sanitizers on OptimizerEarlyEP."), cl::init(false));
}
namespace {
// Default filename used for profile generation.
std::string getDefaultProfileGenName() {
return DebugInfoCorrelate ? "default_%p.proflite" : "default_%m.profraw";
}
class EmitAssemblyHelper {
DiagnosticsEngine &Diags;
const HeaderSearchOptions &HSOpts;
const CodeGenOptions &CodeGenOpts;
const clang::TargetOptions &TargetOpts;
const LangOptions &LangOpts;
Module *TheModule;
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS;
Timer CodeGenerationTime;
std::unique_ptr<raw_pwrite_stream> OS;
Triple TargetTriple;
TargetIRAnalysis getTargetIRAnalysis() const {
if (TM)
return TM->getTargetIRAnalysis();
return TargetIRAnalysis();
}
/// Generates the TargetMachine.
/// Leaves TM unchanged if it is unable to create the target machine.
/// Some of our clang tests specify triples which are not built
/// into clang. This is okay because these tests check the generated
/// IR, and they require DataLayout which depends on the triple.
/// In this case, we allow this method to fail and not report an error.
/// When MustCreateTM is used, we print an error if we are unable to load
/// the requested target.
void CreateTargetMachine(bool MustCreateTM);
/// Add passes necessary to emit assembly or LLVM IR.
///
/// \return True on success.
bool AddEmitPasses(legacy::PassManager &CodeGenPasses, BackendAction Action,
raw_pwrite_stream &OS, raw_pwrite_stream *DwoOS);
std::unique_ptr<llvm::ToolOutputFile> openOutputFile(StringRef Path) {
std::error_code EC;
auto F = std::make_unique<llvm::ToolOutputFile>(Path, EC,
llvm::sys::fs::OF_None);
if (EC) {
Diags.Report(diag::err_fe_unable_to_open_output) << Path << EC.message();
F.reset();
}
return F;
}
void
RunOptimizationPipeline(BackendAction Action,
std::unique_ptr<raw_pwrite_stream> &OS,
std::unique_ptr<llvm::ToolOutputFile> &ThinLinkOS);
void RunCodegenPipeline(BackendAction Action,
std::unique_ptr<raw_pwrite_stream> &OS,
std::unique_ptr<llvm::ToolOutputFile> &DwoOS);
/// Check whether we should emit a module summary for regular LTO.
/// The module summary should be emitted by default for regular LTO
/// except for ld64 targets.
///
/// \return True if the module summary should be emitted.
bool shouldEmitRegularLTOSummary() const {
return CodeGenOpts.PrepareForLTO && !CodeGenOpts.DisableLLVMPasses &&
TargetTriple.getVendor() != llvm::Triple::Apple;
}
public:
EmitAssemblyHelper(DiagnosticsEngine &_Diags,
const HeaderSearchOptions &HeaderSearchOpts,
const CodeGenOptions &CGOpts,
const clang::TargetOptions &TOpts,
const LangOptions &LOpts, Module *M,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS)
: Diags(_Diags), HSOpts(HeaderSearchOpts), CodeGenOpts(CGOpts),
TargetOpts(TOpts), LangOpts(LOpts), TheModule(M), VFS(std::move(VFS)),
CodeGenerationTime("codegen", "Code Generation Time"),
TargetTriple(TheModule->getTargetTriple()) {}
~EmitAssemblyHelper() {
if (CodeGenOpts.DisableFree)
BuryPointer(std::move(TM));
}
std::unique_ptr<TargetMachine> TM;
// Emit output using the new pass manager for the optimization pipeline.
void EmitAssembly(BackendAction Action,
std::unique_ptr<raw_pwrite_stream> OS);
};
}
static SanitizerCoverageOptions
getSancovOptsFromCGOpts(const CodeGenOptions &CGOpts) {
SanitizerCoverageOptions Opts;
Opts.CoverageType =
static_cast<SanitizerCoverageOptions::Type>(CGOpts.SanitizeCoverageType);
Opts.IndirectCalls = CGOpts.SanitizeCoverageIndirectCalls;
Opts.TraceBB = CGOpts.SanitizeCoverageTraceBB;
Opts.TraceCmp = CGOpts.SanitizeCoverageTraceCmp;
Opts.TraceDiv = CGOpts.SanitizeCoverageTraceDiv;
Opts.TraceGep = CGOpts.SanitizeCoverageTraceGep;
Opts.Use8bitCounters = CGOpts.SanitizeCoverage8bitCounters;
Opts.TracePC = CGOpts.SanitizeCoverageTracePC;
Opts.TracePCGuard = CGOpts.SanitizeCoverageTracePCGuard;
Opts.NoPrune = CGOpts.SanitizeCoverageNoPrune;
Opts.Inline8bitCounters = CGOpts.SanitizeCoverageInline8bitCounters;
Opts.InlineBoolFlag = CGOpts.SanitizeCoverageInlineBoolFlag;
Opts.PCTable = CGOpts.SanitizeCoveragePCTable;
Opts.StackDepth = CGOpts.SanitizeCoverageStackDepth;
Opts.TraceLoads = CGOpts.SanitizeCoverageTraceLoads;
Opts.TraceStores = CGOpts.SanitizeCoverageTraceStores;
Opts.CollectControlFlow = CGOpts.SanitizeCoverageControlFlow;
return Opts;
}
static SanitizerBinaryMetadataOptions
getSanitizerBinaryMetadataOptions(const CodeGenOptions &CGOpts) {
SanitizerBinaryMetadataOptions Opts;
Opts.Covered = CGOpts.SanitizeBinaryMetadataCovered;
Opts.Atomics = CGOpts.SanitizeBinaryMetadataAtomics;
Opts.UAR = CGOpts.SanitizeBinaryMetadataUAR;
return Opts;
}
// Check if ASan should use GC-friendly instrumentation for globals.
// First of all, there is no point if -fdata-sections is off (expect for MachO,
// where this is not a factor). Also, on ELF this feature requires an assembler
// extension that only works with -integrated-as at the moment.
static bool asanUseGlobalsGC(const Triple &T, const CodeGenOptions &CGOpts) {
if (!CGOpts.SanitizeAddressGlobalsDeadStripping)
return false;
switch (T.getObjectFormat()) {
case Triple::MachO:
case Triple::COFF:
return true;
case Triple::ELF:
return !CGOpts.DisableIntegratedAS;
case Triple::GOFF:
llvm::report_fatal_error("ASan not implemented for GOFF");
case Triple::XCOFF:
llvm::report_fatal_error("ASan not implemented for XCOFF.");
case Triple::Wasm:
case Triple::DXContainer:
case Triple::SPIRV:
case Triple::UnknownObjectFormat:
break;
}
return false;
}
static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,
const CodeGenOptions &CodeGenOpts) {
TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
switch (CodeGenOpts.getVecLib()) {
case CodeGenOptions::Accelerate:
TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate,
TargetTriple);
break;
case CodeGenOptions::LIBMVEC:
TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::LIBMVEC_X86,
TargetTriple);
break;
case CodeGenOptions::MASSV:
TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::MASSV,
TargetTriple);
break;
case CodeGenOptions::SVML:
TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::SVML,
TargetTriple);
break;
case CodeGenOptions::SLEEF:
TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::SLEEFGNUABI,
TargetTriple);
break;
case CodeGenOptions::Darwin_libsystem_m:
TLII->addVectorizableFunctionsFromVecLib(
TargetLibraryInfoImpl::DarwinLibSystemM, TargetTriple);
break;
default:
break;
}
return TLII;
}
static std::optional<llvm::CodeModel::Model>
getCodeModel(const CodeGenOptions &CodeGenOpts) {
unsigned CodeModel = llvm::StringSwitch<unsigned>(CodeGenOpts.CodeModel)
.Case("tiny", llvm::CodeModel::Tiny)
.Case("small", llvm::CodeModel::Small)
.Case("kernel", llvm::CodeModel::Kernel)
.Case("medium", llvm::CodeModel::Medium)
.Case("large", llvm::CodeModel::Large)
.Case("default", ~1u)
.Default(~0u);
assert(CodeModel != ~0u && "invalid code model!");
if (CodeModel == ~1u)
return std::nullopt;
return static_cast<llvm::CodeModel::Model>(CodeModel);
}
static CodeGenFileType getCodeGenFileType(BackendAction Action) {
if (Action == Backend_EmitObj)
return CGFT_ObjectFile;
else if (Action == Backend_EmitMCNull)
return CGFT_Null;
else {
assert(Action == Backend_EmitAssembly && "Invalid action!");
return CGFT_AssemblyFile;
}
}
static bool actionRequiresCodeGen(BackendAction Action) {
return Action != Backend_EmitNothing && Action != Backend_EmitBC &&
Action != Backend_EmitLL;
}
static bool initTargetOptions(DiagnosticsEngine &Diags,
llvm::TargetOptions &Options,
const CodeGenOptions &CodeGenOpts,
const clang::TargetOptions &TargetOpts,
const LangOptions &LangOpts,
const HeaderSearchOptions &HSOpts) {
switch (LangOpts.getThreadModel()) {
case LangOptions::ThreadModelKind::POSIX:
Options.ThreadModel = llvm::ThreadModel::POSIX;
break;
case LangOptions::ThreadModelKind::Single:
Options.ThreadModel = llvm::ThreadModel::Single;
break;
}
// Set float ABI type.
assert((CodeGenOpts.FloatABI == "soft" || CodeGenOpts.FloatABI == "softfp" ||
CodeGenOpts.FloatABI == "hard" || CodeGenOpts.FloatABI.empty()) &&
"Invalid Floating Point ABI!");
Options.FloatABIType =
llvm::StringSwitch<llvm::FloatABI::ABIType>(CodeGenOpts.FloatABI)
.Case("soft", llvm::FloatABI::Soft)
.Case("softfp", llvm::FloatABI::Soft)
.Case("hard", llvm::FloatABI::Hard)
.Default(llvm::FloatABI::Default);
// Set FP fusion mode.
switch (LangOpts.getDefaultFPContractMode()) {
case LangOptions::FPM_Off:
// Preserve any contraction performed by the front-end. (Strict performs
// splitting of the muladd intrinsic in the backend.)
Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
break;
case LangOptions::FPM_On:
case LangOptions::FPM_FastHonorPragmas:
Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
break;
case LangOptions::FPM_Fast:
Options.AllowFPOpFusion = llvm::FPOpFusion::Fast;
break;
}
Options.BinutilsVersion =
llvm::TargetMachine::parseBinutilsVersion(CodeGenOpts.BinutilsVersion);
Options.UseInitArray = CodeGenOpts.UseInitArray;
Options.DisableIntegratedAS = CodeGenOpts.DisableIntegratedAS;
Options.CompressDebugSections = CodeGenOpts.getCompressDebugSections();
Options.RelaxELFRelocations = CodeGenOpts.RelaxELFRelocations;
// Set EABI version.
Options.EABIVersion = TargetOpts.EABIVersion;
if (LangOpts.hasSjLjExceptions())
Options.ExceptionModel = llvm::ExceptionHandling::SjLj;
if (LangOpts.hasSEHExceptions())
Options.ExceptionModel = llvm::ExceptionHandling::WinEH;
if (LangOpts.hasDWARFExceptions())
Options.ExceptionModel = llvm::ExceptionHandling::DwarfCFI;
if (LangOpts.hasWasmExceptions())
Options.ExceptionModel = llvm::ExceptionHandling::Wasm;
Options.NoInfsFPMath = LangOpts.NoHonorInfs;
Options.NoNaNsFPMath = LangOpts.NoHonorNaNs;
Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
Options.UnsafeFPMath = LangOpts.AllowFPReassoc && LangOpts.AllowRecip &&
LangOpts.NoSignedZero && LangOpts.ApproxFunc &&
(LangOpts.getDefaultFPContractMode() ==
LangOptions::FPModeKind::FPM_Fast ||
LangOpts.getDefaultFPContractMode() ==
LangOptions::FPModeKind::FPM_FastHonorPragmas);
Options.ApproxFuncFPMath = LangOpts.ApproxFunc;
Options.BBSections =
llvm::StringSwitch<llvm::BasicBlockSection>(CodeGenOpts.BBSections)
.Case("all", llvm::BasicBlockSection::All)
.Case("labels", llvm::BasicBlockSection::Labels)
.StartsWith("list=", llvm::BasicBlockSection::List)
.Case("none", llvm::BasicBlockSection::None)
.Default(llvm::BasicBlockSection::None);
if (Options.BBSections == llvm::BasicBlockSection::List) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
MemoryBuffer::getFile(CodeGenOpts.BBSections.substr(5));
if (!MBOrErr) {
Diags.Report(diag::err_fe_unable_to_load_basic_block_sections_file)
<< MBOrErr.getError().message();
return false;
}
Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
}
Options.EnableMachineFunctionSplitter = CodeGenOpts.SplitMachineFunctions;
Options.FunctionSections = CodeGenOpts.FunctionSections;
Options.DataSections = CodeGenOpts.DataSections;
Options.IgnoreXCOFFVisibility = LangOpts.IgnoreXCOFFVisibility;
Options.UniqueSectionNames = CodeGenOpts.UniqueSectionNames;
Options.UniqueBasicBlockSectionNames =
CodeGenOpts.UniqueBasicBlockSectionNames;
Options.TLSSize = CodeGenOpts.TLSSize;
Options.EmulatedTLS = CodeGenOpts.EmulatedTLS;
Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();
Options.EmitStackSizeSection = CodeGenOpts.StackSizeSection;
Options.StackUsageOutput = CodeGenOpts.StackUsageOutput;
Options.EmitAddrsig = CodeGenOpts.Addrsig;
Options.ForceDwarfFrameSection = CodeGenOpts.ForceDwarfFrameSection;
Options.EmitCallSiteInfo = CodeGenOpts.EmitCallSiteInfo;
Options.EnableAIXExtendedAltivecABI = LangOpts.EnableAIXExtendedAltivecABI;
Options.XRayOmitFunctionIndex = CodeGenOpts.XRayOmitFunctionIndex;
Options.LoopAlignment = CodeGenOpts.LoopAlignment;
Options.DebugStrictDwarf = CodeGenOpts.DebugStrictDwarf;
Options.ObjectFilenameForDebug = CodeGenOpts.ObjectFilenameForDebug;
Options.Hotpatch = CodeGenOpts.HotPatch;
Options.JMCInstrument = CodeGenOpts.JMCInstrument;
Options.XCOFFReadOnlyPointers = CodeGenOpts.XCOFFReadOnlyPointers;
switch (CodeGenOpts.getSwiftAsyncFramePointer()) {
case CodeGenOptions::SwiftAsyncFramePointerKind::Auto:
Options.SwiftAsyncFramePointer =
SwiftAsyncFramePointerMode::DeploymentBased;
break;
case CodeGenOptions::SwiftAsyncFramePointerKind::Always:
Options.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Always;
break;
case CodeGenOptions::SwiftAsyncFramePointerKind::Never:
Options.SwiftAsyncFramePointer = SwiftAsyncFramePointerMode::Never;
break;
}
Options.MCOptions.SplitDwarfFile = CodeGenOpts.SplitDwarfFile;
Options.MCOptions.EmitDwarfUnwind = CodeGenOpts.getEmitDwarfUnwind();
Options.MCOptions.MCRelaxAll = CodeGenOpts.RelaxAll;
Options.MCOptions.MCSaveTempLabels = CodeGenOpts.SaveTempLabels;
Options.MCOptions.MCUseDwarfDirectory =
CodeGenOpts.NoDwarfDirectoryAsm
? llvm::MCTargetOptions::DisableDwarfDirectory
: llvm::MCTargetOptions::EnableDwarfDirectory;
Options.MCOptions.MCNoExecStack = CodeGenOpts.NoExecStack;
Options.MCOptions.MCIncrementalLinkerCompatible =
CodeGenOpts.IncrementalLinkerCompatible;
Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
Options.MCOptions.MCNoWarn = CodeGenOpts.NoWarn;
Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
Options.MCOptions.Dwarf64 = CodeGenOpts.Dwarf64;
Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;
Options.MCOptions.ABIName = TargetOpts.ABI;
for (const auto &Entry : HSOpts.UserEntries)
if (!Entry.IsFramework &&
(Entry.Group == frontend::IncludeDirGroup::Quoted ||
Entry.Group == frontend::IncludeDirGroup::Angled ||
Entry.Group == frontend::IncludeDirGroup::System))
Options.MCOptions.IASSearchPaths.push_back(
Entry.IgnoreSysRoot ? Entry.Path : HSOpts.Sysroot + Entry.Path);
Options.MCOptions.Argv0 = CodeGenOpts.Argv0;
Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;
Options.MCOptions.AsSecureLogFile = CodeGenOpts.AsSecureLogFile;
Options.MisExpect = CodeGenOpts.MisExpect;
return true;
}
static std::optional<GCOVOptions>
getGCOVOptions(const CodeGenOptions &CodeGenOpts, const LangOptions &LangOpts) {
if (!CodeGenOpts.EmitGcovArcs && !CodeGenOpts.EmitGcovNotes)
return std::nullopt;
// Not using 'GCOVOptions::getDefault' allows us to avoid exiting if
// LLVM's -default-gcov-version flag is set to something invalid.
GCOVOptions Options;
Options.EmitNotes = CodeGenOpts.EmitGcovNotes;
Options.EmitData = CodeGenOpts.EmitGcovArcs;
llvm::copy(CodeGenOpts.CoverageVersion, std::begin(Options.Version));
Options.NoRedZone = CodeGenOpts.DisableRedZone;
Options.Filter = CodeGenOpts.ProfileFilterFiles;
Options.Exclude = CodeGenOpts.ProfileExcludeFiles;
Options.Atomic = CodeGenOpts.AtomicProfileUpdate;
return Options;
}
static std::optional<InstrProfOptions>
getInstrProfOptions(const CodeGenOptions &CodeGenOpts,
const LangOptions &LangOpts) {
if (!CodeGenOpts.hasProfileClangInstr())
return std::nullopt;
InstrProfOptions Options;
Options.NoRedZone = CodeGenOpts.DisableRedZone;
Options.InstrProfileOutput = CodeGenOpts.InstrProfileOutput;
Options.Atomic = CodeGenOpts.AtomicProfileUpdate;
return Options;
}
static void setCommandLineOpts(const CodeGenOptions &CodeGenOpts) {
SmallVector<const char *, 16> BackendArgs;
BackendArgs.push_back("clang"); // Fake program name.
if (!CodeGenOpts.DebugPass.empty()) {
BackendArgs.push_back("-debug-pass");
BackendArgs.push_back(CodeGenOpts.DebugPass.c_str());
}
if (!CodeGenOpts.LimitFloatPrecision.empty()) {
BackendArgs.push_back("-limit-float-precision");
BackendArgs.push_back(CodeGenOpts.LimitFloatPrecision.c_str());
}
// Check for the default "clang" invocation that won't set any cl::opt values.
// Skip trying to parse the command line invocation to avoid the issues
// described below.
if (BackendArgs.size() == 1)
return;
BackendArgs.push_back(nullptr);
// FIXME: The command line parser below is not thread-safe and shares a global
// state, so this call might crash or overwrite the options of another Clang
// instance in the same process.
llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
BackendArgs.data());
}
void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
// Create the TargetMachine for generating code.
std::string Error;
std::string Triple = TheModule->getTargetTriple();
const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
if (!TheTarget) {
if (MustCreateTM)
Diags.Report(diag::err_fe_unable_to_create_target) << Error;
return;
}
std::optional<llvm::CodeModel::Model> CM = getCodeModel(CodeGenOpts);
std::string FeaturesStr =
llvm::join(TargetOpts.Features.begin(), TargetOpts.Features.end(), ",");
llvm::Reloc::Model RM = CodeGenOpts.RelocationModel;
std::optional<CodeGenOpt::Level> OptLevelOrNone =
CodeGenOpt::getLevel(CodeGenOpts.OptimizationLevel);
assert(OptLevelOrNone && "Invalid optimization level!");
CodeGenOpt::Level OptLevel = *OptLevelOrNone;
llvm::TargetOptions Options;
if (!initTargetOptions(Diags, Options, CodeGenOpts, TargetOpts, LangOpts,
HSOpts))
return;
TM.reset(TheTarget->createTargetMachine(Triple, TargetOpts.CPU, FeaturesStr,
Options, RM, CM, OptLevel));
}
bool EmitAssemblyHelper::AddEmitPasses(legacy::PassManager &CodeGenPasses,
BackendAction Action,
raw_pwrite_stream &OS,
raw_pwrite_stream *DwoOS) {
// Add LibraryInfo.
std::unique_ptr<TargetLibraryInfoImpl> TLII(
createTLII(TargetTriple, CodeGenOpts));
CodeGenPasses.add(new TargetLibraryInfoWrapperPass(*TLII));
// Normal mode, emit a .s or .o file by running the code generator. Note,
// this also adds codegenerator level optimization passes.
CodeGenFileType CGFT = getCodeGenFileType(Action);
// Add ObjC ARC final-cleanup optimizations. This is done as part of the
// "codegen" passes so that it isn't run multiple times when there is
// inlining happening.
if (CodeGenOpts.OptimizationLevel > 0)
CodeGenPasses.add(createObjCARCContractPass());
if (TM->addPassesToEmitFile(CodeGenPasses, OS, DwoOS, CGFT,
/*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
Diags.Report(diag::err_fe_unable_to_interface_with_target);
return false;
}
return true;
}
static OptimizationLevel mapToLevel(const CodeGenOptions &Opts) {
switch (Opts.OptimizationLevel) {
default:
llvm_unreachable("Invalid optimization level!");
case 0:
return OptimizationLevel::O0;
case 1:
return OptimizationLevel::O1;
case 2:
switch (Opts.OptimizeSize) {
default:
llvm_unreachable("Invalid optimization level for size!");
case 0:
return OptimizationLevel::O2;
case 1:
return OptimizationLevel::Os;
case 2:
return OptimizationLevel::Oz;
}
case 3:
return OptimizationLevel::O3;
}
}
static void addKCFIPass(const Triple &TargetTriple, const LangOptions &LangOpts,
PassBuilder &PB) {
// If the back-end supports KCFI operand bundle lowering, skip KCFIPass.
if (TargetTriple.getArch() == llvm::Triple::x86_64 ||
TargetTriple.isAArch64(64))
return;
// Ensure we lower KCFI operand bundles with -O0.
PB.registerOptimizerLastEPCallback(
[&](ModulePassManager &MPM, OptimizationLevel Level) {
if (Level == OptimizationLevel::O0 &&
LangOpts.Sanitize.has(SanitizerKind::KCFI))
MPM.addPass(createModuleToFunctionPassAdaptor(KCFIPass()));
});
// When optimizations are requested, run KCIFPass after InstCombine to
// avoid unnecessary checks.
PB.registerPeepholeEPCallback(
[&](FunctionPassManager &FPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0 &&
LangOpts.Sanitize.has(SanitizerKind::KCFI))
FPM.addPass(KCFIPass());
});
}
static void addSanitizers(const Triple &TargetTriple,
const CodeGenOptions &CodeGenOpts,
const LangOptions &LangOpts, PassBuilder &PB) {
auto SanitizersCallback = [&](ModulePassManager &MPM,
OptimizationLevel Level) {
if (CodeGenOpts.hasSanitizeCoverage()) {
auto SancovOpts = getSancovOptsFromCGOpts(CodeGenOpts);
MPM.addPass(SanitizerCoveragePass(
SancovOpts, CodeGenOpts.SanitizeCoverageAllowlistFiles,
CodeGenOpts.SanitizeCoverageIgnorelistFiles));
}
if (CodeGenOpts.hasSanitizeBinaryMetadata()) {
MPM.addPass(SanitizerBinaryMetadataPass(
getSanitizerBinaryMetadataOptions(CodeGenOpts),
CodeGenOpts.SanitizeMetadataIgnorelistFiles));
}
auto MSanPass = [&](SanitizerMask Mask, bool CompileKernel) {
if (LangOpts.Sanitize.has(Mask)) {
int TrackOrigins = CodeGenOpts.SanitizeMemoryTrackOrigins;
bool Recover = CodeGenOpts.SanitizeRecover.has(Mask);
MemorySanitizerOptions options(TrackOrigins, Recover, CompileKernel,
CodeGenOpts.SanitizeMemoryParamRetval);
MPM.addPass(MemorySanitizerPass(options));
if (Level != OptimizationLevel::O0) {
// MemorySanitizer inserts complex instrumentation that mostly follows
// the logic of the original code, but operates on "shadow" values. It
// can benefit from re-running some general purpose optimization
// passes.
MPM.addPass(RequireAnalysisPass<GlobalsAA, Module>());
FunctionPassManager FPM;
FPM.addPass(EarlyCSEPass(true /* Enable mem-ssa. */));
FPM.addPass(InstCombinePass());
FPM.addPass(JumpThreadingPass());
FPM.addPass(GVNPass());
FPM.addPass(InstCombinePass());
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
}
}
};
MSanPass(SanitizerKind::Memory, false);
MSanPass(SanitizerKind::KernelMemory, true);
if (LangOpts.Sanitize.has(SanitizerKind::Thread)) {
MPM.addPass(ModuleThreadSanitizerPass());
MPM.addPass(createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
}
auto ASanPass = [&](SanitizerMask Mask, bool CompileKernel) {
if (LangOpts.Sanitize.has(Mask)) {
bool UseGlobalGC = asanUseGlobalsGC(TargetTriple, CodeGenOpts);
bool UseOdrIndicator = CodeGenOpts.SanitizeAddressUseOdrIndicator;
llvm::AsanDtorKind DestructorKind =
CodeGenOpts.getSanitizeAddressDtor();
AddressSanitizerOptions Opts;
Opts.CompileKernel = CompileKernel;
Opts.Recover = CodeGenOpts.SanitizeRecover.has(Mask);
Opts.UseAfterScope = CodeGenOpts.SanitizeAddressUseAfterScope;
Opts.UseAfterReturn = CodeGenOpts.getSanitizeAddressUseAfterReturn();
MPM.addPass(AddressSanitizerPass(Opts, UseGlobalGC, UseOdrIndicator,
DestructorKind));
}
};
ASanPass(SanitizerKind::Address, false);
ASanPass(SanitizerKind::KernelAddress, true);
auto HWASanPass = [&](SanitizerMask Mask, bool CompileKernel) {
if (LangOpts.Sanitize.has(Mask)) {
bool Recover = CodeGenOpts.SanitizeRecover.has(Mask);
MPM.addPass(HWAddressSanitizerPass(
{CompileKernel, Recover,
/*DisableOptimization=*/CodeGenOpts.OptimizationLevel == 0}));
}
};
HWASanPass(SanitizerKind::HWAddress, false);
HWASanPass(SanitizerKind::KernelHWAddress, true);
if (LangOpts.Sanitize.has(SanitizerKind::DataFlow)) {
MPM.addPass(DataFlowSanitizerPass(LangOpts.NoSanitizeFiles));
}
};
if (ClSanitizeOnOptimizerEarlyEP) {
PB.registerOptimizerEarlyEPCallback(
[SanitizersCallback](ModulePassManager &MPM, OptimizationLevel Level) {
ModulePassManager NewMPM;
SanitizersCallback(NewMPM, Level);
if (!NewMPM.isEmpty()) {
// Sanitizers can abandon<GlobalsAA>.
NewMPM.addPass(RequireAnalysisPass<GlobalsAA, Module>());
MPM.addPass(std::move(NewMPM));
}
});
} else {
// LastEP does not need GlobalsAA.
PB.registerOptimizerLastEPCallback(SanitizersCallback);
}
}
void EmitAssemblyHelper::RunOptimizationPipeline(
BackendAction Action, std::unique_ptr<raw_pwrite_stream> &OS,
std::unique_ptr<llvm::ToolOutputFile> &ThinLinkOS) {
std::optional<PGOOptions> PGOOpt;
if (CodeGenOpts.hasProfileIRInstr())
// -fprofile-generate.
PGOOpt = PGOOptions(
CodeGenOpts.InstrProfileOutput.empty() ? getDefaultProfileGenName()
: CodeGenOpts.InstrProfileOutput,
"", "", nullptr, PGOOptions::IRInstr, PGOOptions::NoCSAction,
CodeGenOpts.DebugInfoForProfiling);
else if (CodeGenOpts.hasProfileIRUse()) {
// -fprofile-use.
auto CSAction = CodeGenOpts.hasProfileCSIRUse() ? PGOOptions::CSIRUse
: PGOOptions::NoCSAction;
PGOOpt =
PGOOptions(CodeGenOpts.ProfileInstrumentUsePath, "",
CodeGenOpts.ProfileRemappingFile, VFS, PGOOptions::IRUse,
CSAction, CodeGenOpts.DebugInfoForProfiling);
} else if (!CodeGenOpts.SampleProfileFile.empty())
// -fprofile-sample-use
PGOOpt = PGOOptions(
CodeGenOpts.SampleProfileFile, "", CodeGenOpts.ProfileRemappingFile,
VFS, PGOOptions::SampleUse, PGOOptions::NoCSAction,
CodeGenOpts.DebugInfoForProfiling, CodeGenOpts.PseudoProbeForProfiling);
else if (CodeGenOpts.PseudoProbeForProfiling)
// -fpseudo-probe-for-profiling
PGOOpt = PGOOptions("", "", "", nullptr, PGOOptions::NoAction,
PGOOptions::NoCSAction,
CodeGenOpts.DebugInfoForProfiling, true);
else if (CodeGenOpts.DebugInfoForProfiling)
// -fdebug-info-for-profiling
PGOOpt = PGOOptions("", "", "", nullptr, PGOOptions::NoAction,
PGOOptions::NoCSAction, true);
// Check to see if we want to generate a CS profile.
if (CodeGenOpts.hasProfileCSIRInstr()) {
assert(!CodeGenOpts.hasProfileCSIRUse() &&
"Cannot have both CSProfileUse pass and CSProfileGen pass at "
"the same time");
if (PGOOpt) {
assert(PGOOpt->Action != PGOOptions::IRInstr &&
PGOOpt->Action != PGOOptions::SampleUse &&
"Cannot run CSProfileGen pass with ProfileGen or SampleUse "
" pass");
PGOOpt->CSProfileGenFile = CodeGenOpts.InstrProfileOutput.empty()
? getDefaultProfileGenName()
: CodeGenOpts.InstrProfileOutput;
PGOOpt->CSAction = PGOOptions::CSIRInstr;
} else
PGOOpt =
PGOOptions("",
CodeGenOpts.InstrProfileOutput.empty()
? getDefaultProfileGenName()
: CodeGenOpts.InstrProfileOutput,
"", nullptr, PGOOptions::NoAction, PGOOptions::CSIRInstr,
CodeGenOpts.DebugInfoForProfiling);
}
if (TM)
TM->setPGOOption(PGOOpt);
PipelineTuningOptions PTO;
PTO.LoopUnrolling = CodeGenOpts.UnrollLoops;
// For historical reasons, loop interleaving is set to mirror setting for loop
// unrolling.
PTO.LoopInterleaving = CodeGenOpts.UnrollLoops;
PTO.LoopVectorization = CodeGenOpts.VectorizeLoop;
PTO.SLPVectorization = CodeGenOpts.VectorizeSLP;
PTO.MergeFunctions = CodeGenOpts.MergeFunctions;
// Only enable CGProfilePass when using integrated assembler, since
// non-integrated assemblers don't recognize .cgprofile section.
PTO.CallGraphProfile = !CodeGenOpts.DisableIntegratedAS;
LoopAnalysisManager LAM;
FunctionAnalysisManager FAM;
CGSCCAnalysisManager CGAM;
ModuleAnalysisManager MAM;
bool DebugPassStructure = CodeGenOpts.DebugPass == "Structure";
PassInstrumentationCallbacks PIC;
PrintPassOptions PrintPassOpts;
PrintPassOpts.Indent = DebugPassStructure;
PrintPassOpts.SkipAnalyses = DebugPassStructure;
StandardInstrumentations SI(
TheModule->getContext(),
(CodeGenOpts.DebugPassManager || DebugPassStructure),
/*VerifyEach*/ false, PrintPassOpts);
SI.registerCallbacks(PIC, &MAM);
PassBuilder PB(TM.get(), PTO, PGOOpt, &PIC);
// Handle the assignment tracking feature options.
switch (CodeGenOpts.getAssignmentTrackingMode()) {
case CodeGenOptions::AssignmentTrackingOpts::Forced:
PB.registerPipelineStartEPCallback(
[&](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(AssignmentTrackingPass());
});
break;
case CodeGenOptions::AssignmentTrackingOpts::Enabled:
// Disable assignment tracking in LTO builds for now as the performance
// cost is too high. Disable for LLDB tuning due to llvm.org/PR43126.
if (!CodeGenOpts.PrepareForThinLTO && !CodeGenOpts.PrepareForLTO &&
CodeGenOpts.getDebuggerTuning() != llvm::DebuggerKind::LLDB) {
PB.registerPipelineStartEPCallback(
[&](ModulePassManager &MPM, OptimizationLevel Level) {
// Only use assignment tracking if optimisations are enabled.
if (Level != OptimizationLevel::O0)
MPM.addPass(AssignmentTrackingPass());
});
}
break;
case CodeGenOptions::AssignmentTrackingOpts::Disabled:
break;
}
// Enable verify-debuginfo-preserve-each for new PM.
DebugifyEachInstrumentation Debugify;
DebugInfoPerPass DebugInfoBeforePass;
if (CodeGenOpts.EnableDIPreservationVerify) {
Debugify.setDebugifyMode(DebugifyMode::OriginalDebugInfo);
Debugify.setDebugInfoBeforePass(DebugInfoBeforePass);
if (!CodeGenOpts.DIBugsReportFilePath.empty())
Debugify.setOrigDIVerifyBugsReportFilePath(
CodeGenOpts.DIBugsReportFilePath);
Debugify.registerCallbacks(PIC, MAM);
}
// Attempt to load pass plugins and register their callbacks with PB.
for (auto &PluginFN : CodeGenOpts.PassPlugins) {
auto PassPlugin = PassPlugin::Load(PluginFN);
if (PassPlugin) {
PassPlugin->registerPassBuilderCallbacks(PB);
} else {
Diags.Report(diag::err_fe_unable_to_load_plugin)
<< PluginFN << toString(PassPlugin.takeError());
}
}
#define HANDLE_EXTENSION(Ext) \
get##Ext##PluginInfo().RegisterPassBuilderCallbacks(PB);
#include "llvm/Support/Extension.def"
// Register the target library analysis directly and give it a customized
// preset TLI.
std::unique_ptr<TargetLibraryInfoImpl> TLII(
createTLII(TargetTriple, CodeGenOpts));
FAM.registerPass([&] { return TargetLibraryAnalysis(*TLII); });
// 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 (!CodeGenOpts.DisableLLVMPasses) {
// Map our optimization levels into one of the distinct levels used to
// configure the pipeline.
OptimizationLevel Level = mapToLevel(CodeGenOpts);
bool IsThinLTO = CodeGenOpts.PrepareForThinLTO;
bool IsLTO = CodeGenOpts.PrepareForLTO;
if (LangOpts.ObjCAutoRefCount) {
PB.registerPipelineStartEPCallback(
[](ModulePassManager &MPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0)
MPM.addPass(
createModuleToFunctionPassAdaptor(ObjCARCExpandPass()));
});
PB.registerPipelineEarlySimplificationEPCallback(
[](ModulePassManager &MPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0)
MPM.addPass(ObjCARCAPElimPass());
});
PB.registerScalarOptimizerLateEPCallback(
[](FunctionPassManager &FPM, OptimizationLevel Level) {
if (Level != OptimizationLevel::O0)
FPM.addPass(ObjCARCOptPass());
});
}
// If we reached here with a non-empty index file name, then the index
// file was empty and we are not performing ThinLTO backend compilation
// (used in testing in a distributed build environment).
bool IsThinLTOPostLink = !CodeGenOpts.ThinLTOIndexFile.empty();
// If so drop any the type test assume sequences inserted for whole program
// vtables so that codegen doesn't complain.
if (IsThinLTOPostLink)
PB.registerPipelineStartEPCallback(
[](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(LowerTypeTestsPass(/*ExportSummary=*/nullptr,
/*ImportSummary=*/nullptr,
/*DropTypeTests=*/true));
});
if (CodeGenOpts.InstrumentFunctions ||
CodeGenOpts.InstrumentFunctionEntryBare ||
CodeGenOpts.InstrumentFunctionsAfterInlining ||
CodeGenOpts.InstrumentForProfiling) {
PB.registerPipelineStartEPCallback(
[](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(createModuleToFunctionPassAdaptor(
EntryExitInstrumenterPass(/*PostInlining=*/false)));
});
PB.registerOptimizerLastEPCallback(
[](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(createModuleToFunctionPassAdaptor(
EntryExitInstrumenterPass(/*PostInlining=*/true)));
});
}
// Register callbacks to schedule sanitizer passes at the appropriate part
// of the pipeline.
if (LangOpts.Sanitize.has(SanitizerKind::LocalBounds))
PB.registerScalarOptimizerLateEPCallback(
[](FunctionPassManager &FPM, OptimizationLevel Level) {
FPM.addPass(BoundsCheckingPass());
});
// Don't add sanitizers if we are here from ThinLTO PostLink. That already
// done on PreLink stage.
if (!IsThinLTOPostLink) {
addSanitizers(TargetTriple, CodeGenOpts, LangOpts, PB);
addKCFIPass(TargetTriple, LangOpts, PB);
}
if (std::optional<GCOVOptions> Options =
getGCOVOptions(CodeGenOpts, LangOpts))
PB.registerPipelineStartEPCallback(
[Options](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(GCOVProfilerPass(*Options));
});
if (std::optional<InstrProfOptions> Options =
getInstrProfOptions(CodeGenOpts, LangOpts))
PB.registerPipelineStartEPCallback(
[Options](ModulePassManager &MPM, OptimizationLevel Level) {
MPM.addPass(InstrProfiling(*Options, false));
});
if (IsThinLTO) {
MPM = PB.buildThinLTOPreLinkDefaultPipeline(Level);
} else if (IsLTO) {
MPM = PB.buildLTOPreLinkDefaultPipeline(Level);
} else {
MPM = PB.buildPerModuleDefaultPipeline(Level);
}