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CodeGenModule.cpp
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CodeGenModule.cpp
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//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This coordinates the per-module state used while generating code.
//
//===----------------------------------------------------------------------===//
#include "CodeGenModule.h"
#include "ABIInfo.h"
#include "CGBlocks.h"
#include "CGCUDARuntime.h"
#include "CGCXXABI.h"
#include "CGCall.h"
#include "CGDebugInfo.h"
#include "CGHLSLRuntime.h"
#include "CGObjCRuntime.h"
#include "CGOpenCLRuntime.h"
#include "CGOpenMPRuntime.h"
#include "CGOpenMPRuntimeGPU.h"
#include "CodeGenFunction.h"
#include "CodeGenPGO.h"
#include "ConstantEmitter.h"
#include "CoverageMappingGen.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/Module.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/Version.h"
#include "clang/CodeGen/BackendUtil.h"
#include "clang/CodeGen/ConstantInitBuilder.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
#include "llvm/IR/AttributeMask.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ProfileSummary.h"
#include "llvm/ProfileData/InstrProfReader.h"
#include "llvm/ProfileData/SampleProf.h"
#include "llvm/Support/CRC.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TimeProfiler.h"
#include "llvm/Support/xxhash.h"
#include "llvm/TargetParser/RISCVISAInfo.h"
#include "llvm/TargetParser/Triple.h"
#include "llvm/TargetParser/X86TargetParser.h"
#include "llvm/Transforms/Utils/BuildLibCalls.h"
#include <optional>
using namespace clang;
using namespace CodeGen;
static llvm::cl::opt<bool> LimitedCoverage(
"limited-coverage-experimental", llvm::cl::Hidden,
llvm::cl::desc("Emit limited coverage mapping information (experimental)"));
static const char AnnotationSection[] = "llvm.metadata";
static CGCXXABI *createCXXABI(CodeGenModule &CGM) {
switch (CGM.getContext().getCXXABIKind()) {
case TargetCXXABI::AppleARM64:
case TargetCXXABI::Fuchsia:
case TargetCXXABI::GenericAArch64:
case TargetCXXABI::GenericARM:
case TargetCXXABI::iOS:
case TargetCXXABI::WatchOS:
case TargetCXXABI::GenericMIPS:
case TargetCXXABI::GenericItanium:
case TargetCXXABI::WebAssembly:
case TargetCXXABI::XL:
return CreateItaniumCXXABI(CGM);
case TargetCXXABI::Microsoft:
return CreateMicrosoftCXXABI(CGM);
}
llvm_unreachable("invalid C++ ABI kind");
}
static std::unique_ptr<TargetCodeGenInfo>
createTargetCodeGenInfo(CodeGenModule &CGM) {
const TargetInfo &Target = CGM.getTarget();
const llvm::Triple &Triple = Target.getTriple();
const CodeGenOptions &CodeGenOpts = CGM.getCodeGenOpts();
switch (Triple.getArch()) {
default:
return createDefaultTargetCodeGenInfo(CGM);
case llvm::Triple::m68k:
return createM68kTargetCodeGenInfo(CGM);
case llvm::Triple::mips:
case llvm::Triple::mipsel:
if (Triple.getOS() == llvm::Triple::NaCl)
return createPNaClTargetCodeGenInfo(CGM);
return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/true);
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
return createMIPSTargetCodeGenInfo(CGM, /*IsOS32=*/false);
case llvm::Triple::avr: {
// For passing parameters, R8~R25 are used on avr, and R18~R25 are used
// on avrtiny. For passing return value, R18~R25 are used on avr, and
// R22~R25 are used on avrtiny.
unsigned NPR = Target.getABI() == "avrtiny" ? 6 : 18;
unsigned NRR = Target.getABI() == "avrtiny" ? 4 : 8;
return createAVRTargetCodeGenInfo(CGM, NPR, NRR);
}
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_32:
case llvm::Triple::aarch64_be: {
AArch64ABIKind Kind = AArch64ABIKind::AAPCS;
if (Target.getABI() == "darwinpcs")
Kind = AArch64ABIKind::DarwinPCS;
else if (Triple.isOSWindows())
return createWindowsAArch64TargetCodeGenInfo(CGM, AArch64ABIKind::Win64);
else if (Target.getABI() == "aapcs-soft")
Kind = AArch64ABIKind::AAPCSSoft;
else if (Target.getABI() == "pauthtest")
Kind = AArch64ABIKind::PAuthTest;
return createAArch64TargetCodeGenInfo(CGM, Kind);
}
case llvm::Triple::wasm32:
case llvm::Triple::wasm64: {
WebAssemblyABIKind Kind = WebAssemblyABIKind::MVP;
if (Target.getABI() == "experimental-mv")
Kind = WebAssemblyABIKind::ExperimentalMV;
return createWebAssemblyTargetCodeGenInfo(CGM, Kind);
}
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb: {
if (Triple.getOS() == llvm::Triple::Win32)
return createWindowsARMTargetCodeGenInfo(CGM, ARMABIKind::AAPCS_VFP);
ARMABIKind Kind = ARMABIKind::AAPCS;
StringRef ABIStr = Target.getABI();
if (ABIStr == "apcs-gnu")
Kind = ARMABIKind::APCS;
else if (ABIStr == "aapcs16")
Kind = ARMABIKind::AAPCS16_VFP;
else if (CodeGenOpts.FloatABI == "hard" ||
(CodeGenOpts.FloatABI != "soft" &&
(Triple.getEnvironment() == llvm::Triple::GNUEABIHF ||
Triple.getEnvironment() == llvm::Triple::MuslEABIHF ||
Triple.getEnvironment() == llvm::Triple::EABIHF)))
Kind = ARMABIKind::AAPCS_VFP;
return createARMTargetCodeGenInfo(CGM, Kind);
}
case llvm::Triple::ppc: {
if (Triple.isOSAIX())
return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/false);
bool IsSoftFloat =
CodeGenOpts.FloatABI == "soft" || Target.hasFeature("spe");
return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat);
}
case llvm::Triple::ppcle: {
bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
return createPPC32TargetCodeGenInfo(CGM, IsSoftFloat);
}
case llvm::Triple::ppc64:
if (Triple.isOSAIX())
return createAIXTargetCodeGenInfo(CGM, /*Is64Bit=*/true);
if (Triple.isOSBinFormatELF()) {
PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv1;
if (Target.getABI() == "elfv2")
Kind = PPC64_SVR4_ABIKind::ELFv2;
bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat);
}
return createPPC64TargetCodeGenInfo(CGM);
case llvm::Triple::ppc64le: {
assert(Triple.isOSBinFormatELF() && "PPC64 LE non-ELF not supported!");
PPC64_SVR4_ABIKind Kind = PPC64_SVR4_ABIKind::ELFv2;
if (Target.getABI() == "elfv1")
Kind = PPC64_SVR4_ABIKind::ELFv1;
bool IsSoftFloat = CodeGenOpts.FloatABI == "soft";
return createPPC64_SVR4_TargetCodeGenInfo(CGM, Kind, IsSoftFloat);
}
case llvm::Triple::nvptx:
case llvm::Triple::nvptx64:
return createNVPTXTargetCodeGenInfo(CGM);
case llvm::Triple::msp430:
return createMSP430TargetCodeGenInfo(CGM);
case llvm::Triple::riscv32:
case llvm::Triple::riscv64: {
StringRef ABIStr = Target.getABI();
unsigned XLen = Target.getPointerWidth(LangAS::Default);
unsigned ABIFLen = 0;
if (ABIStr.ends_with("f"))
ABIFLen = 32;
else if (ABIStr.ends_with("d"))
ABIFLen = 64;
bool EABI = ABIStr.ends_with("e");
return createRISCVTargetCodeGenInfo(CGM, XLen, ABIFLen, EABI);
}
case llvm::Triple::systemz: {
bool SoftFloat = CodeGenOpts.FloatABI == "soft";
bool HasVector = !SoftFloat && Target.getABI() == "vector";
return createSystemZTargetCodeGenInfo(CGM, HasVector, SoftFloat);
}
case llvm::Triple::tce:
case llvm::Triple::tcele:
return createTCETargetCodeGenInfo(CGM);
case llvm::Triple::x86: {
bool IsDarwinVectorABI = Triple.isOSDarwin();
bool IsWin32FloatStructABI = Triple.isOSWindows() && !Triple.isOSCygMing();
if (Triple.getOS() == llvm::Triple::Win32) {
return createWinX86_32TargetCodeGenInfo(
CGM, IsDarwinVectorABI, IsWin32FloatStructABI,
CodeGenOpts.NumRegisterParameters);
}
return createX86_32TargetCodeGenInfo(
CGM, IsDarwinVectorABI, IsWin32FloatStructABI,
CodeGenOpts.NumRegisterParameters, CodeGenOpts.FloatABI == "soft");
}
case llvm::Triple::x86_64: {
StringRef ABI = Target.getABI();
X86AVXABILevel AVXLevel = (ABI == "avx512" ? X86AVXABILevel::AVX512
: ABI == "avx" ? X86AVXABILevel::AVX
: X86AVXABILevel::None);
switch (Triple.getOS()) {
case llvm::Triple::Win32:
return createWinX86_64TargetCodeGenInfo(CGM, AVXLevel);
default:
return createX86_64TargetCodeGenInfo(CGM, AVXLevel);
}
}
case llvm::Triple::hexagon:
return createHexagonTargetCodeGenInfo(CGM);
case llvm::Triple::lanai:
return createLanaiTargetCodeGenInfo(CGM);
case llvm::Triple::r600:
return createAMDGPUTargetCodeGenInfo(CGM);
case llvm::Triple::amdgcn:
return createAMDGPUTargetCodeGenInfo(CGM);
case llvm::Triple::sparc:
return createSparcV8TargetCodeGenInfo(CGM);
case llvm::Triple::sparcv9:
return createSparcV9TargetCodeGenInfo(CGM);
case llvm::Triple::xcore:
return createXCoreTargetCodeGenInfo(CGM);
case llvm::Triple::arc:
return createARCTargetCodeGenInfo(CGM);
case llvm::Triple::spir:
case llvm::Triple::spir64:
return createCommonSPIRTargetCodeGenInfo(CGM);
case llvm::Triple::spirv32:
case llvm::Triple::spirv64:
return createSPIRVTargetCodeGenInfo(CGM);
case llvm::Triple::dxil:
return createDirectXTargetCodeGenInfo(CGM);
case llvm::Triple::ve:
return createVETargetCodeGenInfo(CGM);
case llvm::Triple::csky: {
bool IsSoftFloat = !Target.hasFeature("hard-float-abi");
bool hasFP64 =
Target.hasFeature("fpuv2_df") || Target.hasFeature("fpuv3_df");
return createCSKYTargetCodeGenInfo(CGM, IsSoftFloat ? 0
: hasFP64 ? 64
: 32);
}
case llvm::Triple::bpfeb:
case llvm::Triple::bpfel:
return createBPFTargetCodeGenInfo(CGM);
case llvm::Triple::loongarch32:
case llvm::Triple::loongarch64: {
StringRef ABIStr = Target.getABI();
unsigned ABIFRLen = 0;
if (ABIStr.ends_with("f"))
ABIFRLen = 32;
else if (ABIStr.ends_with("d"))
ABIFRLen = 64;
return createLoongArchTargetCodeGenInfo(
CGM, Target.getPointerWidth(LangAS::Default), ABIFRLen);
}
}
}
const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
if (!TheTargetCodeGenInfo)
TheTargetCodeGenInfo = createTargetCodeGenInfo(*this);
return *TheTargetCodeGenInfo;
}
CodeGenModule::CodeGenModule(ASTContext &C,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
const HeaderSearchOptions &HSO,
const PreprocessorOptions &PPO,
const CodeGenOptions &CGO, llvm::Module &M,
DiagnosticsEngine &diags,
CoverageSourceInfo *CoverageInfo)
: Context(C), LangOpts(C.getLangOpts()), FS(FS), HeaderSearchOpts(HSO),
PreprocessorOpts(PPO), CodeGenOpts(CGO), TheModule(M), Diags(diags),
Target(C.getTargetInfo()), ABI(createCXXABI(*this)),
VMContext(M.getContext()), VTables(*this),
SanitizerMD(new SanitizerMetadata(*this)) {
// Initialize the type cache.
Types.reset(new CodeGenTypes(*this));
llvm::LLVMContext &LLVMContext = M.getContext();
VoidTy = llvm::Type::getVoidTy(LLVMContext);
Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
HalfTy = llvm::Type::getHalfTy(LLVMContext);
BFloatTy = llvm::Type::getBFloatTy(LLVMContext);
FloatTy = llvm::Type::getFloatTy(LLVMContext);
DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
PointerWidthInBits = C.getTargetInfo().getPointerWidth(LangAS::Default);
PointerAlignInBytes =
C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(LangAS::Default))
.getQuantity();
SizeSizeInBytes =
C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity();
IntAlignInBytes =
C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
CharTy =
llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getCharWidth());
IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
IntPtrTy = llvm::IntegerType::get(LLVMContext,
C.getTargetInfo().getMaxPointerWidth());
Int8PtrTy = llvm::PointerType::get(LLVMContext,
C.getTargetAddressSpace(LangAS::Default));
const llvm::DataLayout &DL = M.getDataLayout();
AllocaInt8PtrTy =
llvm::PointerType::get(LLVMContext, DL.getAllocaAddrSpace());
GlobalsInt8PtrTy =
llvm::PointerType::get(LLVMContext, DL.getDefaultGlobalsAddressSpace());
ConstGlobalsPtrTy = llvm::PointerType::get(
LLVMContext, C.getTargetAddressSpace(GetGlobalConstantAddressSpace()));
ASTAllocaAddressSpace = getTargetCodeGenInfo().getASTAllocaAddressSpace();
// Build C++20 Module initializers.
// TODO: Add Microsoft here once we know the mangling required for the
// initializers.
CXX20ModuleInits =
LangOpts.CPlusPlusModules && getCXXABI().getMangleContext().getKind() ==
ItaniumMangleContext::MK_Itanium;
RuntimeCC = getTargetCodeGenInfo().getABIInfo().getRuntimeCC();
if (LangOpts.ObjC)
createObjCRuntime();
if (LangOpts.OpenCL)
createOpenCLRuntime();
if (LangOpts.OpenMP)
createOpenMPRuntime();
if (LangOpts.CUDA)
createCUDARuntime();
if (LangOpts.HLSL)
createHLSLRuntime();
// Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
(!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
TBAA.reset(new CodeGenTBAA(Context, getTypes(), TheModule, CodeGenOpts,
getLangOpts()));
// If debug info or coverage generation is enabled, create the CGDebugInfo
// object.
if (CodeGenOpts.getDebugInfo() != llvm::codegenoptions::NoDebugInfo ||
CodeGenOpts.CoverageNotesFile.size() ||
CodeGenOpts.CoverageDataFile.size())
DebugInfo.reset(new CGDebugInfo(*this));
Block.GlobalUniqueCount = 0;
if (C.getLangOpts().ObjC)
ObjCData.reset(new ObjCEntrypoints());
if (CodeGenOpts.hasProfileClangUse()) {
auto ReaderOrErr = llvm::IndexedInstrProfReader::create(
CodeGenOpts.ProfileInstrumentUsePath, *FS,
CodeGenOpts.ProfileRemappingFile);
// We're checking for profile read errors in CompilerInvocation, so if
// there was an error it should've already been caught. If it hasn't been
// somehow, trip an assertion.
assert(ReaderOrErr);
PGOReader = std::move(ReaderOrErr.get());
}
// If coverage mapping generation is enabled, create the
// CoverageMappingModuleGen object.
if (CodeGenOpts.CoverageMapping)
CoverageMapping.reset(new CoverageMappingModuleGen(*this, *CoverageInfo));
// Generate the module name hash here if needed.
if (CodeGenOpts.UniqueInternalLinkageNames &&
!getModule().getSourceFileName().empty()) {
std::string Path = getModule().getSourceFileName();
// Check if a path substitution is needed from the MacroPrefixMap.
for (const auto &Entry : LangOpts.MacroPrefixMap)
if (Path.rfind(Entry.first, 0) != std::string::npos) {
Path = Entry.second + Path.substr(Entry.first.size());
break;
}
ModuleNameHash = llvm::getUniqueInternalLinkagePostfix(Path);
}
// Record mregparm value now so it is visible through all of codegen.
if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86)
getModule().addModuleFlag(llvm::Module::Error, "NumRegisterParameters",
CodeGenOpts.NumRegisterParameters);
}
CodeGenModule::~CodeGenModule() {}
void CodeGenModule::createObjCRuntime() {
// This is just isGNUFamily(), but we want to force implementors of
// new ABIs to decide how best to do this.
switch (LangOpts.ObjCRuntime.getKind()) {
case ObjCRuntime::GNUstep:
case ObjCRuntime::GCC:
case ObjCRuntime::ObjFW:
ObjCRuntime.reset(CreateGNUObjCRuntime(*this));
return;
case ObjCRuntime::FragileMacOSX:
case ObjCRuntime::MacOSX:
case ObjCRuntime::iOS:
case ObjCRuntime::WatchOS:
ObjCRuntime.reset(CreateMacObjCRuntime(*this));
return;
}
llvm_unreachable("bad runtime kind");
}
void CodeGenModule::createOpenCLRuntime() {
OpenCLRuntime.reset(new CGOpenCLRuntime(*this));
}
void CodeGenModule::createOpenMPRuntime() {
// Select a specialized code generation class based on the target, if any.
// If it does not exist use the default implementation.
switch (getTriple().getArch()) {
case llvm::Triple::nvptx:
case llvm::Triple::nvptx64:
case llvm::Triple::amdgcn:
assert(getLangOpts().OpenMPIsTargetDevice &&
"OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
OpenMPRuntime.reset(new CGOpenMPRuntimeGPU(*this));
break;
default:
if (LangOpts.OpenMPSimd)
OpenMPRuntime.reset(new CGOpenMPSIMDRuntime(*this));
else
OpenMPRuntime.reset(new CGOpenMPRuntime(*this));
break;
}
}
void CodeGenModule::createCUDARuntime() {
CUDARuntime.reset(CreateNVCUDARuntime(*this));
}
void CodeGenModule::createHLSLRuntime() {
HLSLRuntime.reset(new CGHLSLRuntime(*this));
}
void CodeGenModule::addReplacement(StringRef Name, llvm::Constant *C) {
Replacements[Name] = C;
}
void CodeGenModule::applyReplacements() {
for (auto &I : Replacements) {
StringRef MangledName = I.first;
llvm::Constant *Replacement = I.second;
llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
if (!Entry)
continue;
auto *OldF = cast<llvm::Function>(Entry);
auto *NewF = dyn_cast<llvm::Function>(Replacement);
if (!NewF) {
if (auto *Alias = dyn_cast<llvm::GlobalAlias>(Replacement)) {
NewF = dyn_cast<llvm::Function>(Alias->getAliasee());
} else {
auto *CE = cast<llvm::ConstantExpr>(Replacement);
assert(CE->getOpcode() == llvm::Instruction::BitCast ||
CE->getOpcode() == llvm::Instruction::GetElementPtr);
NewF = dyn_cast<llvm::Function>(CE->getOperand(0));
}
}
// Replace old with new, but keep the old order.
OldF->replaceAllUsesWith(Replacement);
if (NewF) {
NewF->removeFromParent();
OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
NewF);
}
OldF->eraseFromParent();
}
}
void CodeGenModule::addGlobalValReplacement(llvm::GlobalValue *GV, llvm::Constant *C) {
GlobalValReplacements.push_back(std::make_pair(GV, C));
}
void CodeGenModule::applyGlobalValReplacements() {
for (auto &I : GlobalValReplacements) {
llvm::GlobalValue *GV = I.first;
llvm::Constant *C = I.second;
GV->replaceAllUsesWith(C);
GV->eraseFromParent();
}
}
// This is only used in aliases that we created and we know they have a
// linear structure.
static const llvm::GlobalValue *getAliasedGlobal(const llvm::GlobalValue *GV) {
const llvm::Constant *C;
if (auto *GA = dyn_cast<llvm::GlobalAlias>(GV))
C = GA->getAliasee();
else if (auto *GI = dyn_cast<llvm::GlobalIFunc>(GV))
C = GI->getResolver();
else
return GV;
const auto *AliaseeGV = dyn_cast<llvm::GlobalValue>(C->stripPointerCasts());
if (!AliaseeGV)
return nullptr;
const llvm::GlobalValue *FinalGV = AliaseeGV->getAliaseeObject();
if (FinalGV == GV)
return nullptr;
return FinalGV;
}
static bool checkAliasedGlobal(
const ASTContext &Context, DiagnosticsEngine &Diags, SourceLocation Location,
bool IsIFunc, const llvm::GlobalValue *Alias, const llvm::GlobalValue *&GV,
const llvm::MapVector<GlobalDecl, StringRef> &MangledDeclNames,
SourceRange AliasRange) {
GV = getAliasedGlobal(Alias);
if (!GV) {
Diags.Report(Location, diag::err_cyclic_alias) << IsIFunc;
return false;
}
if (GV->hasCommonLinkage()) {
const llvm::Triple &Triple = Context.getTargetInfo().getTriple();
if (Triple.getObjectFormat() == llvm::Triple::XCOFF) {
Diags.Report(Location, diag::err_alias_to_common);
return false;
}
}
if (GV->isDeclaration()) {
Diags.Report(Location, diag::err_alias_to_undefined) << IsIFunc << IsIFunc;
Diags.Report(Location, diag::note_alias_requires_mangled_name)
<< IsIFunc << IsIFunc;
// Provide a note if the given function is not found and exists as a
// mangled name.
for (const auto &[Decl, Name] : MangledDeclNames) {
if (const auto *ND = dyn_cast<NamedDecl>(Decl.getDecl())) {
if (ND->getName() == GV->getName()) {
Diags.Report(Location, diag::note_alias_mangled_name_alternative)
<< Name
<< FixItHint::CreateReplacement(
AliasRange,
(Twine(IsIFunc ? "ifunc" : "alias") + "(\"" + Name + "\")")
.str());
}
}
}
return false;
}
if (IsIFunc) {
// Check resolver function type.
const auto *F = dyn_cast<llvm::Function>(GV);
if (!F) {
Diags.Report(Location, diag::err_alias_to_undefined)
<< IsIFunc << IsIFunc;
return false;
}
llvm::FunctionType *FTy = F->getFunctionType();
if (!FTy->getReturnType()->isPointerTy()) {
Diags.Report(Location, diag::err_ifunc_resolver_return);
return false;
}
}
return true;
}
// Emit a warning if toc-data attribute is requested for global variables that
// have aliases and remove the toc-data attribute.
static void checkAliasForTocData(llvm::GlobalVariable *GVar,
const CodeGenOptions &CodeGenOpts,
DiagnosticsEngine &Diags,
SourceLocation Location) {
if (GVar->hasAttribute("toc-data")) {
auto GVId = GVar->getName();
// Is this a global variable specified by the user as local?
if ((llvm::binary_search(CodeGenOpts.TocDataVarsUserSpecified, GVId))) {
Diags.Report(Location, diag::warn_toc_unsupported_type)
<< GVId << "the variable has an alias";
}
llvm::AttributeSet CurrAttributes = GVar->getAttributes();
llvm::AttributeSet NewAttributes =
CurrAttributes.removeAttribute(GVar->getContext(), "toc-data");
GVar->setAttributes(NewAttributes);
}
}
void CodeGenModule::checkAliases() {
// Check if the constructed aliases are well formed. It is really unfortunate
// that we have to do this in CodeGen, but we only construct mangled names
// and aliases during codegen.
bool Error = false;
DiagnosticsEngine &Diags = getDiags();
for (const GlobalDecl &GD : Aliases) {
const auto *D = cast<ValueDecl>(GD.getDecl());
SourceLocation Location;
SourceRange Range;
bool IsIFunc = D->hasAttr<IFuncAttr>();
if (const Attr *A = D->getDefiningAttr()) {
Location = A->getLocation();
Range = A->getRange();
} else
llvm_unreachable("Not an alias or ifunc?");
StringRef MangledName = getMangledName(GD);
llvm::GlobalValue *Alias = GetGlobalValue(MangledName);
const llvm::GlobalValue *GV = nullptr;
if (!checkAliasedGlobal(getContext(), Diags, Location, IsIFunc, Alias, GV,
MangledDeclNames, Range)) {
Error = true;
continue;
}
if (getContext().getTargetInfo().getTriple().isOSAIX())
if (const llvm::GlobalVariable *GVar =
dyn_cast<const llvm::GlobalVariable>(GV))
checkAliasForTocData(const_cast<llvm::GlobalVariable *>(GVar),
getCodeGenOpts(), Diags, Location);
llvm::Constant *Aliasee =
IsIFunc ? cast<llvm::GlobalIFunc>(Alias)->getResolver()
: cast<llvm::GlobalAlias>(Alias)->getAliasee();
llvm::GlobalValue *AliaseeGV;
if (auto CE = dyn_cast<llvm::ConstantExpr>(Aliasee))
AliaseeGV = cast<llvm::GlobalValue>(CE->getOperand(0));
else
AliaseeGV = cast<llvm::GlobalValue>(Aliasee);
if (const SectionAttr *SA = D->getAttr<SectionAttr>()) {
StringRef AliasSection = SA->getName();
if (AliasSection != AliaseeGV->getSection())
Diags.Report(SA->getLocation(), diag::warn_alias_with_section)
<< AliasSection << IsIFunc << IsIFunc;
}
// We have to handle alias to weak aliases in here. LLVM itself disallows
// this since the object semantics would not match the IL one. For
// compatibility with gcc we implement it by just pointing the alias
// to its aliasee's aliasee. We also warn, since the user is probably
// expecting the link to be weak.
if (auto *GA = dyn_cast<llvm::GlobalAlias>(AliaseeGV)) {
if (GA->isInterposable()) {
Diags.Report(Location, diag::warn_alias_to_weak_alias)
<< GV->getName() << GA->getName() << IsIFunc;
Aliasee = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
GA->getAliasee(), Alias->getType());
if (IsIFunc)
cast<llvm::GlobalIFunc>(Alias)->setResolver(Aliasee);
else
cast<llvm::GlobalAlias>(Alias)->setAliasee(Aliasee);
}
}
// ifunc resolvers are usually implemented to run before sanitizer
// initialization. Disable instrumentation to prevent the ordering issue.
if (IsIFunc)
cast<llvm::Function>(Aliasee)->addFnAttr(
llvm::Attribute::DisableSanitizerInstrumentation);
}
if (!Error)
return;
for (const GlobalDecl &GD : Aliases) {
StringRef MangledName = getMangledName(GD);
llvm::GlobalValue *Alias = GetGlobalValue(MangledName);
Alias->replaceAllUsesWith(llvm::UndefValue::get(Alias->getType()));
Alias->eraseFromParent();
}
}
void CodeGenModule::clear() {
DeferredDeclsToEmit.clear();
EmittedDeferredDecls.clear();
DeferredAnnotations.clear();
if (OpenMPRuntime)
OpenMPRuntime->clear();
}
void InstrProfStats::reportDiagnostics(DiagnosticsEngine &Diags,
StringRef MainFile) {
if (!hasDiagnostics())
return;
if (VisitedInMainFile > 0 && VisitedInMainFile == MissingInMainFile) {
if (MainFile.empty())
MainFile = "<stdin>";
Diags.Report(diag::warn_profile_data_unprofiled) << MainFile;
} else {
if (Mismatched > 0)
Diags.Report(diag::warn_profile_data_out_of_date) << Visited << Mismatched;
if (Missing > 0)
Diags.Report(diag::warn_profile_data_missing) << Visited << Missing;
}
}
static std::optional<llvm::GlobalValue::VisibilityTypes>
getLLVMVisibility(clang::LangOptions::VisibilityFromDLLStorageClassKinds K) {
// Map to LLVM visibility.
switch (K) {
case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Keep:
return std::nullopt;
case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Default:
return llvm::GlobalValue::DefaultVisibility;
case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Hidden:
return llvm::GlobalValue::HiddenVisibility;
case clang::LangOptions::VisibilityFromDLLStorageClassKinds::Protected:
return llvm::GlobalValue::ProtectedVisibility;
}
llvm_unreachable("unknown option value!");
}
void setLLVMVisibility(llvm::GlobalValue &GV,
std::optional<llvm::GlobalValue::VisibilityTypes> V) {
if (!V)
return;
// Reset DSO locality before setting the visibility. This removes
// any effects that visibility options and annotations may have
// had on the DSO locality. Setting the visibility will implicitly set
// appropriate globals to DSO Local; however, this will be pessimistic
// w.r.t. to the normal compiler IRGen.
GV.setDSOLocal(false);
GV.setVisibility(*V);
}
static void setVisibilityFromDLLStorageClass(const clang::LangOptions &LO,
llvm::Module &M) {
if (!LO.VisibilityFromDLLStorageClass)
return;
std::optional<llvm::GlobalValue::VisibilityTypes> DLLExportVisibility =
getLLVMVisibility(LO.getDLLExportVisibility());
std::optional<llvm::GlobalValue::VisibilityTypes>
NoDLLStorageClassVisibility =
getLLVMVisibility(LO.getNoDLLStorageClassVisibility());
std::optional<llvm::GlobalValue::VisibilityTypes>
ExternDeclDLLImportVisibility =
getLLVMVisibility(LO.getExternDeclDLLImportVisibility());
std::optional<llvm::GlobalValue::VisibilityTypes>
ExternDeclNoDLLStorageClassVisibility =
getLLVMVisibility(LO.getExternDeclNoDLLStorageClassVisibility());
for (llvm::GlobalValue &GV : M.global_values()) {
if (GV.hasAppendingLinkage() || GV.hasLocalLinkage())
continue;
if (GV.isDeclarationForLinker())
setLLVMVisibility(GV, GV.getDLLStorageClass() ==
llvm::GlobalValue::DLLImportStorageClass
? ExternDeclDLLImportVisibility
: ExternDeclNoDLLStorageClassVisibility);
else
setLLVMVisibility(GV, GV.getDLLStorageClass() ==
llvm::GlobalValue::DLLExportStorageClass
? DLLExportVisibility
: NoDLLStorageClassVisibility);
GV.setDLLStorageClass(llvm::GlobalValue::DefaultStorageClass);
}
}
static bool isStackProtectorOn(const LangOptions &LangOpts,
const llvm::Triple &Triple,
clang::LangOptions::StackProtectorMode Mode) {
if (Triple.isAMDGPU() || Triple.isNVPTX())
return false;
return LangOpts.getStackProtector() == Mode;
}
void CodeGenModule::Release() {
Module *Primary = getContext().getCurrentNamedModule();
if (CXX20ModuleInits && Primary && !Primary->isHeaderLikeModule())
EmitModuleInitializers(Primary);
EmitDeferred();
DeferredDecls.insert(EmittedDeferredDecls.begin(),
EmittedDeferredDecls.end());
EmittedDeferredDecls.clear();
EmitVTablesOpportunistically();
applyGlobalValReplacements();
applyReplacements();
emitMultiVersionFunctions();
if (Context.getLangOpts().IncrementalExtensions &&
GlobalTopLevelStmtBlockInFlight.first) {
const TopLevelStmtDecl *TLSD = GlobalTopLevelStmtBlockInFlight.second;
GlobalTopLevelStmtBlockInFlight.first->FinishFunction(TLSD->getEndLoc());
GlobalTopLevelStmtBlockInFlight = {nullptr, nullptr};
}
// Module implementations are initialized the same way as a regular TU that
// imports one or more modules.
if (CXX20ModuleInits && Primary && Primary->isInterfaceOrPartition())
EmitCXXModuleInitFunc(Primary);
else
EmitCXXGlobalInitFunc();
EmitCXXGlobalCleanUpFunc();
registerGlobalDtorsWithAtExit();
EmitCXXThreadLocalInitFunc();
if (ObjCRuntime)
if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
AddGlobalCtor(ObjCInitFunction);
if (Context.getLangOpts().CUDA && CUDARuntime) {
if (llvm::Function *CudaCtorFunction = CUDARuntime->finalizeModule())
AddGlobalCtor(CudaCtorFunction);
}
if (OpenMPRuntime) {
OpenMPRuntime->createOffloadEntriesAndInfoMetadata();
OpenMPRuntime->clear();
}
if (PGOReader) {
getModule().setProfileSummary(
PGOReader->getSummary(/* UseCS */ false).getMD(VMContext),
llvm::ProfileSummary::PSK_Instr);
if (PGOStats.hasDiagnostics())
PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
}
llvm::stable_sort(GlobalCtors, [](const Structor &L, const Structor &R) {
return L.LexOrder < R.LexOrder;
});
EmitCtorList(GlobalCtors, "llvm.global_ctors");
EmitCtorList(GlobalDtors, "llvm.global_dtors");
EmitGlobalAnnotations();
EmitStaticExternCAliases();
checkAliases();
EmitDeferredUnusedCoverageMappings();
CodeGenPGO(*this).setValueProfilingFlag(getModule());
CodeGenPGO(*this).setProfileVersion(getModule());
if (CoverageMapping)
CoverageMapping->emit();
if (CodeGenOpts.SanitizeCfiCrossDso) {
CodeGenFunction(*this).EmitCfiCheckFail();
CodeGenFunction(*this).EmitCfiCheckStub();
}
if (LangOpts.Sanitize.has(SanitizerKind::KCFI))
finalizeKCFITypes();
emitAtAvailableLinkGuard();
if (Context.getTargetInfo().getTriple().isWasm())
EmitMainVoidAlias();
if (getTriple().isAMDGPU() ||
(getTriple().isSPIRV() && getTriple().getVendor() == llvm::Triple::AMD)) {
// Emit amdhsa_code_object_version module flag, which is code object version
// times 100.
if (getTarget().getTargetOpts().CodeObjectVersion !=
llvm::CodeObjectVersionKind::COV_None) {
getModule().addModuleFlag(llvm::Module::Error,
"amdhsa_code_object_version",
getTarget().getTargetOpts().CodeObjectVersion);
}
// Currently, "-mprintf-kind" option is only supported for HIP
if (LangOpts.HIP) {
auto *MDStr = llvm::MDString::get(
getLLVMContext(), (getTarget().getTargetOpts().AMDGPUPrintfKindVal ==
TargetOptions::AMDGPUPrintfKind::Hostcall)
? "hostcall"
: "buffered");
getModule().addModuleFlag(llvm::Module::Error, "amdgpu_printf_kind",
MDStr);
}
}
// Emit a global array containing all external kernels or device variables
// used by host functions and mark it as used for CUDA/HIP. This is necessary
// to get kernels or device variables in archives linked in even if these
// kernels or device variables are only used in host functions.
if (!Context.CUDAExternalDeviceDeclODRUsedByHost.empty()) {
SmallVector<llvm::Constant *, 8> UsedArray;
for (auto D : Context.CUDAExternalDeviceDeclODRUsedByHost) {
GlobalDecl GD;
if (auto *FD = dyn_cast<FunctionDecl>(D))
GD = GlobalDecl(FD, KernelReferenceKind::Kernel);
else
GD = GlobalDecl(D);
UsedArray.push_back(llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(
GetAddrOfGlobal(GD), Int8PtrTy));
}
llvm::ArrayType *ATy = llvm::ArrayType::get(Int8PtrTy, UsedArray.size());
auto *GV = new llvm::GlobalVariable(
getModule(), ATy, false, llvm::GlobalValue::InternalLinkage,
llvm::ConstantArray::get(ATy, UsedArray), "__clang_gpu_used_external");
addCompilerUsedGlobal(GV);
}
if (LangOpts.HIP && !getLangOpts().OffloadingNewDriver) {
// Emit a unique ID so that host and device binaries from the same
// compilation unit can be associated.
auto *GV = new llvm::GlobalVariable(
getModule(), Int8Ty, false, llvm::GlobalValue::ExternalLinkage,
llvm::Constant::getNullValue(Int8Ty),
"__hip_cuid_" + getContext().getCUIDHash());
addCompilerUsedGlobal(GV);
}
emitLLVMUsed();
if (SanStats)
SanStats->finish();
if (CodeGenOpts.Autolink &&
(Context.getLangOpts().Modules || !LinkerOptionsMetadata.empty())) {
EmitModuleLinkOptions();
}
// On ELF we pass the dependent library specifiers directly to the linker
// without manipulating them. This is in contrast to other platforms where
// they are mapped to a specific linker option by the compiler. This
// difference is a result of the greater variety of ELF linkers and the fact
// that ELF linkers tend to handle libraries in a more complicated fashion
// than on other platforms. This forces us to defer handling the dependent
// libs to the linker.
//
// CUDA/HIP device and host libraries are different. Currently there is no
// way to differentiate dependent libraries for host or device. Existing
// usage of #pragma comment(lib, *) is intended for host libraries on
// Windows. Therefore emit llvm.dependent-libraries only for host.
if (!ELFDependentLibraries.empty() && !Context.getLangOpts().CUDAIsDevice) {
auto *NMD = getModule().getOrInsertNamedMetadata("llvm.dependent-libraries");
for (auto *MD : ELFDependentLibraries)
NMD->addOperand(MD);
}
if (CodeGenOpts.DwarfVersion) {