void LTOCodeGenerator::applyScopeRestrictions() {
if (ScopeRestrictionsDone)
return;
Module *mergedModule = Linker.getModule();
// Start off with a verification pass.
PassManager passes;
passes.add(createVerifierPass());
// mark which symbols can not be internalized
Mangler Mangler(TargetMach);
std::vector<const char*> MustPreserveList;
SmallPtrSet<GlobalValue*, 8> AsmUsed;
std::vector<StringRef> Libcalls;
TargetLibraryInfo TLI(Triple(TargetMach->getTargetTriple()));
accumulateAndSortLibcalls(Libcalls, TLI, TargetMach->getTargetLowering());
for (Module::iterator f = mergedModule->begin(),
e = mergedModule->end(); f != e; ++f)
applyRestriction(*f, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (Module::global_iterator v = mergedModule->global_begin(),
e = mergedModule->global_end(); v != e; ++v)
applyRestriction(*v, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (Module::alias_iterator a = mergedModule->alias_begin(),
e = mergedModule->alias_end(); a != e; ++a)
applyRestriction(*a, Libcalls, MustPreserveList, AsmUsed, Mangler);
GlobalVariable *LLVMCompilerUsed =
mergedModule->getGlobalVariable("llvm.compiler.used");
findUsedValues(LLVMCompilerUsed, AsmUsed);
if (LLVMCompilerUsed)
LLVMCompilerUsed->eraseFromParent();
if (!AsmUsed.empty()) {
llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
std::vector<Constant*> asmUsed2;
for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = AsmUsed.begin(),
e = AsmUsed.end(); i !=e; ++i) {
GlobalValue *GV = *i;
Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
asmUsed2.push_back(c);
}
llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
LLVMCompilerUsed =
new llvm::GlobalVariable(*mergedModule, ATy, false,
llvm::GlobalValue::AppendingLinkage,
llvm::ConstantArray::get(ATy, asmUsed2),
"llvm.compiler.used");
LLVMCompilerUsed->setSection("llvm.metadata");
}
passes.add(createInternalizePass(MustPreserveList));
// apply scope restrictions
passes.run(*mergedModule);
ScopeRestrictionsDone = true;
}
void InstrProfiling::lowerCoverageData(GlobalVariable *CoverageData) {
CoverageData->setSection(getCoverageSection());
CoverageData->setAlignment(8);
Constant *Init = CoverageData->getInitializer();
// We're expecting { i32, i32, i32, i32, [n x { i8*, i32, i32 }], [m x i8] }
// for some C. If not, the frontend's given us something broken.
assert(Init->getNumOperands() == 6 && "bad number of fields in coverage map");
assert(isa<ConstantArray>(Init->getAggregateElement(4)) &&
"invalid function list in coverage map");
ConstantArray *Records = cast<ConstantArray>(Init->getAggregateElement(4));
for (unsigned I = 0, E = Records->getNumOperands(); I < E; ++I) {
Constant *Record = Records->getOperand(I);
Value *V = const_cast<Value *>(Record->getOperand(0))->stripPointerCasts();
assert(isa<GlobalVariable>(V) && "Missing reference to function name");
GlobalVariable *Name = cast<GlobalVariable>(V);
// If we have region counters for this name, we've already handled it.
auto It = RegionCounters.find(Name);
if (It != RegionCounters.end())
continue;
// Move the name variable to the right section.
Name->setSection(getNameSection());
Name->setAlignment(1);
}
}
void InstrProfiling::emitUses() {
if (UsedVars.empty())
return;
GlobalVariable *LLVMUsed = M->getGlobalVariable("llvm.used");
std::vector<Constant *> MergedVars;
if (LLVMUsed) {
// Collect the existing members of llvm.used.
ConstantArray *Inits = cast<ConstantArray>(LLVMUsed->getInitializer());
for (unsigned I = 0, E = Inits->getNumOperands(); I != E; ++I)
MergedVars.push_back(Inits->getOperand(I));
LLVMUsed->eraseFromParent();
}
Type *i8PTy = Type::getInt8PtrTy(M->getContext());
// Add uses for our data.
for (auto *Value : UsedVars)
MergedVars.push_back(
ConstantExpr::getBitCast(cast<Constant>(Value), i8PTy));
// Recreate llvm.used.
ArrayType *ATy = ArrayType::get(i8PTy, MergedVars.size());
LLVMUsed =
new GlobalVariable(*M, ATy, false, GlobalValue::AppendingLinkage,
ConstantArray::get(ATy, MergedVars), "llvm.used");
LLVMUsed->setSection("llvm.metadata");
}
void LTOCodeGenerator::applyScopeRestrictions() {
if (_scopeRestrictionsDone) return;
Module *mergedModule = _linker.getModule();
// Start off with a verification pass.
PassManager passes;
passes.add(createVerifierPass());
// mark which symbols can not be internalized
MCContext Context(*_target->getMCAsmInfo(), *_target->getRegisterInfo(),NULL);
Mangler mangler(Context, *_target->getTargetData());
std::vector<const char*> mustPreserveList;
SmallPtrSet<GlobalValue*, 8> asmUsed;
for (Module::iterator f = mergedModule->begin(),
e = mergedModule->end(); f != e; ++f)
applyRestriction(*f, mustPreserveList, asmUsed, mangler);
for (Module::global_iterator v = mergedModule->global_begin(),
e = mergedModule->global_end(); v != e; ++v)
applyRestriction(*v, mustPreserveList, asmUsed, mangler);
for (Module::alias_iterator a = mergedModule->alias_begin(),
e = mergedModule->alias_end(); a != e; ++a)
applyRestriction(*a, mustPreserveList, asmUsed, mangler);
GlobalVariable *LLVMCompilerUsed =
mergedModule->getGlobalVariable("llvm.compiler.used");
findUsedValues(LLVMCompilerUsed, asmUsed);
if (LLVMCompilerUsed)
LLVMCompilerUsed->eraseFromParent();
llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(_context);
std::vector<Constant*> asmUsed2;
for (SmallPtrSet<GlobalValue*, 16>::const_iterator i = asmUsed.begin(),
e = asmUsed.end(); i !=e; ++i) {
GlobalValue *GV = *i;
Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
asmUsed2.push_back(c);
}
llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
LLVMCompilerUsed =
new llvm::GlobalVariable(*mergedModule, ATy, false,
llvm::GlobalValue::AppendingLinkage,
llvm::ConstantArray::get(ATy, asmUsed2),
"llvm.compiler.used");
LLVMCompilerUsed->setSection("llvm.metadata");
// Add prerequisite passes needed by SAFECode
PassManagerBuilder().populateLTOPassManager(passes, /*Internalize=*/ false,
!DisableInline);
passes.add(createInternalizePass(mustPreserveList));
// apply scope restrictions
passes.run(*mergedModule);
_scopeRestrictionsDone = true;
}
void LTOCodeGenerator::applyScopeRestrictions() {
if (ScopeRestrictionsDone || !ShouldInternalize)
return;
// Start off with a verification pass.
legacy::PassManager passes;
passes.add(createVerifierPass());
// mark which symbols can not be internalized
Mangler Mangler;
std::vector<const char*> MustPreserveList;
SmallPtrSet<GlobalValue*, 8> AsmUsed;
std::vector<StringRef> Libcalls;
TargetLibraryInfoImpl TLII(Triple(TargetMach->getTargetTriple()));
TargetLibraryInfo TLI(TLII);
accumulateAndSortLibcalls(Libcalls, TLI, *MergedModule, *TargetMach);
for (Function &f : *MergedModule)
applyRestriction(f, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (GlobalVariable &v : MergedModule->globals())
applyRestriction(v, Libcalls, MustPreserveList, AsmUsed, Mangler);
for (GlobalAlias &a : MergedModule->aliases())
applyRestriction(a, Libcalls, MustPreserveList, AsmUsed, Mangler);
GlobalVariable *LLVMCompilerUsed =
MergedModule->getGlobalVariable("llvm.compiler.used");
findUsedValues(LLVMCompilerUsed, AsmUsed);
if (LLVMCompilerUsed)
LLVMCompilerUsed->eraseFromParent();
if (!AsmUsed.empty()) {
llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(Context);
std::vector<Constant*> asmUsed2;
for (auto *GV : AsmUsed) {
Constant *c = ConstantExpr::getBitCast(GV, i8PTy);
asmUsed2.push_back(c);
}
llvm::ArrayType *ATy = llvm::ArrayType::get(i8PTy, asmUsed2.size());
LLVMCompilerUsed =
new llvm::GlobalVariable(*MergedModule, ATy, false,
llvm::GlobalValue::AppendingLinkage,
llvm::ConstantArray::get(ATy, asmUsed2),
"llvm.compiler.used");
LLVMCompilerUsed->setSection("llvm.metadata");
}
passes.add(createInternalizePass(MustPreserveList));
// apply scope restrictions
passes.run(*MergedModule);
ScopeRestrictionsDone = true;
}
bool SancusModuleCreator::handleData(GlobalVariable& gv)
{
SancusModuleInfo info = getSancusModuleInfo(&gv);
if (!info.isInSm)
return false;
if (gv.hasCommonLinkage())
gv.setLinkage(GlobalValue::WeakAnyLinkage);
gv.setSection(info.getDataSection());
return true;
}
void SancusModuleCreator::createFunctionTable(Module& m)
{
LLVMContext& ctx = m.getContext();
// struct SmFunctionInfo
// {
// void* address;
// unsigned arg_length;
// unsigned ret_regs;
// };
Type* funcInfoFields[] = {voidPtrTy, wordTy, wordTy};
StructType* funcInfoTy = StructType::get(ctx, funcInfoFields,
/*isPacked=*/true);
// create a global SM function table for every SM and initialize it
// initializers for the funcs[] array.
// map from section name to initializer
std::map<std::string, std::vector<Constant*>> funcsEls;
for (Function* f : entries)
{
SancusModuleInfo info = getSancusModuleInfo(f);
assert(info.isEntry && "Asking function table for non-entry");
// initializer for the SmFunctionInfo struct
FunctionCcInfo ccInfo(f);
Constant* funcFields[] = {ConstantExpr::getBitCast(f, voidPtrTy),
ConstantInt::get(wordTy, ccInfo.argsLength),
ConstantInt::get(wordTy, ccInfo.retRegsUsage)};
funcsEls[info.getTableSection()]
.push_back(ConstantStruct::get(funcInfoTy, funcFields));
}
for (const auto& it : funcsEls)
{
// struct SmFunctionInfo funcs[];
ArrayType* funcsTy = ArrayType::get(funcInfoTy, it.second.size());
Constant* funcsInit = ConstantArray::get(funcsTy, it.second);
GlobalVariable* table =
new GlobalVariable(m, funcsTy, /*isConstant=*/true,
GlobalVariable::InternalLinkage, funcsInit);
table->setSection(it.first);
table->setAlignment(2);
}
}
// Convert string to global value. Use existing global if possible.
Constant* ConvertMetadataStringToGV(const char *str) {
Constant *Init = ConstantArray::get(std::string(str));
// Use cached string if it exists.
static std::map<Constant*, GlobalVariable*> StringCSTCache;
GlobalVariable *&Slot = StringCSTCache[Init];
if (Slot) return Slot;
// Create a new string global.
GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
GlobalVariable::InternalLinkage,
Init, ".str", TheModule);
GV->setSection("llvm.metadata");
Slot = GV;
return GV;
}
GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
GlobalVariable *Name = Inc->getName();
auto It = RegionCounters.find(Name);
if (It != RegionCounters.end())
return It->second;
// Move the name variable to the right section. Place them in a COMDAT group
// if the associated function is a COMDAT. This will make sure that
// only one copy of counters of the COMDAT function will be emitted after
// linking.
Function *Fn = Inc->getParent()->getParent();
Comdat *ProfileVarsComdat = nullptr;
if (Fn->hasComdat())
ProfileVarsComdat = M->getOrInsertComdat(StringRef(getVarName(Inc, "vars")));
Name->setSection(getNameSection());
Name->setAlignment(1);
Name->setComdat(ProfileVarsComdat);
uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
LLVMContext &Ctx = M->getContext();
ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);
// Create the counters variable.
auto *Counters = new GlobalVariable(*M, CounterTy, false, Name->getLinkage(),
Constant::getNullValue(CounterTy),
getVarName(Inc, "counters"));
Counters->setVisibility(Name->getVisibility());
Counters->setSection(getCountersSection());
Counters->setAlignment(8);
Counters->setComdat(ProfileVarsComdat);
RegionCounters[Inc->getName()] = Counters;
// Create data variable.
auto *NameArrayTy = Name->getType()->getPointerElementType();
auto *Int32Ty = Type::getInt32Ty(Ctx);
auto *Int64Ty = Type::getInt64Ty(Ctx);
auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
auto *Int64PtrTy = Type::getInt64PtrTy(Ctx);
Type *DataTypes[] = {Int32Ty, Int32Ty, Int64Ty, Int8PtrTy, Int64PtrTy};
auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));
Constant *DataVals[] = {
ConstantInt::get(Int32Ty, NameArrayTy->getArrayNumElements()),
ConstantInt::get(Int32Ty, NumCounters),
ConstantInt::get(Int64Ty, Inc->getHash()->getZExtValue()),
ConstantExpr::getBitCast(Name, Int8PtrTy),
ConstantExpr::getBitCast(Counters, Int64PtrTy)};
auto *Data = new GlobalVariable(*M, DataTy, true, Name->getLinkage(),
ConstantStruct::get(DataTy, DataVals),
getVarName(Inc, "data"));
Data->setVisibility(Name->getVisibility());
Data->setSection(getDataSection());
Data->setAlignment(8);
Data->setComdat(ProfileVarsComdat);
// Mark the data variable as used so that it isn't stripped out.
UsedVars.push_back(Data);
return Counters;
}
void MetadataTransform(CallSite &CS, const TargetData *TD)
{
Instruction *I = CS.getInstruction();
Module *M = I->getParent()->getParent()->getParent();
LLVMContext &Ctx = I->getContext();
unsigned argIdx = 0;
if (CS.arg_size() < 2)
report_fatal_error(I, "_SYS_lti_metadata requires at least two args");
// Parse the 'key' parameter
ConstantInt *CI = dyn_cast<ConstantInt>(CS.getArgument(argIdx++));
if (!CI)
report_fatal_error(I, "Metadata key must be a constant integer.");
uint16_t key = CI->getZExtValue();
if (key != CI->getZExtValue())
report_fatal_error(I, "Metadata key argument is too large.");
// Parse the 'fmt' parameter
std::string fmt;
if (!GetConstantStringInfo(CS.getArgument(argIdx++), fmt))
report_fatal_error(I, "Metadata format must be a constant string.");
if (fmt.size() != CS.arg_size() - 2)
report_fatal_error(I, "Length of metadata format must match number of parameters");
if (fmt.size() == 0)
report_fatal_error(I, "Empty metadata values are not supported");
/*
* Parse every other parameter according to the format string
*/
SmallVector<Constant*, 8> Members;
unsigned align = 1;
for (std::string::iterator FI = fmt.begin(), FE = fmt.end();
FI != FE; ++FI, argIdx++) {
Constant *Arg = dyn_cast<Constant>(CS.getArgument(argIdx));
Constant *C;
if (!Arg)
report_fatal_error(I, "Metadata argument " + Twine(argIdx+1) + " is not constant");
/*
* First, non-integer types
*/
switch (*FI) {
case 's': {
std::string str;
if (!GetConstantStringInfo(Arg, str))
report_fatal_error(I, "Metadata formatter 's' requires a constant string");
Members.push_back(ConstantArray::get(Ctx, str, false));
continue;
}
}
/*
* Integer types
*/
if (Arg->getType()->isPointerTy())
Arg = ConstantExpr::getPointerCast(Arg, Type::getInt32Ty(Ctx));
if (!Arg->getType()->isIntegerTy())
report_fatal_error(I, "Metadata argument " + Twine(argIdx+1) +
" can't be converted to an integer type.");
switch (*FI) {
case 'b':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt8Ty(Ctx), true);
break;
case 'B':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt8Ty(Ctx), false);
break;
case 'h':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt16Ty(Ctx), true);
break;
case 'H':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt16Ty(Ctx), false);
break;
case 'i':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt32Ty(Ctx), true);
break;
case 'I':
C = ConstantExpr::getIntegerCast(Arg, Type::getInt32Ty(Ctx), false);
break;
default:
report_fatal_error(I, "Unsupported format character '" + Twine(*FI) + "' in metadata");
}
align = std::max(align, TD->getABITypeAlignment(C->getType()));
Members.push_back(C);
}
Constant *Struct = ConstantStruct::getAnon(Members);
/*
* Install this metadata item as a global variable in a special section
*/
GlobalVariable *GV = new GlobalVariable(*M, Struct->getType(),
true, GlobalValue::ExternalLinkage, Struct, "", 0, false);
GV->setAlignment(align);
GV->setName(SVMDecorations::META + Twine(key) + SVMDecorations::SEPARATOR);
GV->setSection(".metadata");
// Remove the original _SYS_lti_metadata() call
I->eraseFromParent();
}
GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
GlobalVariable *NamePtr = Inc->getName();
auto It = ProfileDataMap.find(NamePtr);
PerFunctionProfileData PD;
if (It != ProfileDataMap.end()) {
if (It->second.RegionCounters)
return It->second.RegionCounters;
PD = It->second;
}
// Move the name variable to the right section. Place them in a COMDAT group
// if the associated function is a COMDAT. This will make sure that
// only one copy of counters of the COMDAT function will be emitted after
// linking.
Function *Fn = Inc->getParent()->getParent();
Comdat *ProfileVarsComdat = nullptr;
if (Fn->hasComdat())
ProfileVarsComdat = getOrCreateProfileComdat(*M, Inc);
NamePtr->setSection(getNameSection());
NamePtr->setAlignment(1);
NamePtr->setComdat(ProfileVarsComdat);
uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
LLVMContext &Ctx = M->getContext();
ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);
// Create the counters variable.
auto *CounterPtr =
new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
Constant::getNullValue(CounterTy),
getVarName(Inc, getInstrProfCountersVarPrefix()));
CounterPtr->setVisibility(NamePtr->getVisibility());
CounterPtr->setSection(getCountersSection());
CounterPtr->setAlignment(8);
CounterPtr->setComdat(ProfileVarsComdat);
// Create data variable.
auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
auto *Int16Ty = Type::getInt16Ty(Ctx);
auto *Int16ArrayTy = ArrayType::get(Int16Ty, IPVK_Last+1);
Type *DataTypes[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) LLVMType,
#include "llvm/ProfileData/InstrProfData.inc"
};
auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));
Constant *FunctionAddr = shouldRecordFunctionAddr(Fn) ?
ConstantExpr::getBitCast(Fn, Int8PtrTy) :
ConstantPointerNull::get(Int8PtrTy);
Constant *Int16ArrayVals[IPVK_Last+1];
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
Int16ArrayVals[Kind] = ConstantInt::get(Int16Ty, PD.NumValueSites[Kind]);
Constant *DataVals[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
#include "llvm/ProfileData/InstrProfData.inc"
};
auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
ConstantStruct::get(DataTy, DataVals),
getVarName(Inc, getInstrProfDataVarPrefix()));
Data->setVisibility(NamePtr->getVisibility());
Data->setSection(getDataSection());
Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
Data->setComdat(ProfileVarsComdat);
PD.RegionCounters = CounterPtr;
PD.DataVar = Data;
ProfileDataMap[NamePtr] = PD;
// Mark the data variable as used so that it isn't stripped out.
UsedVars.push_back(Data);
return CounterPtr;
}
/// emit_global_to_llvm - Emit the specified VAR_DECL or aggregate CONST_DECL to
/// LLVM as a global variable. This function implements the end of
/// assemble_variable.
void emit_global_to_llvm(tree decl) {
if (errorcount || sorrycount) return;
// FIXME: Support alignment on globals: DECL_ALIGN.
// FIXME: DECL_PRESERVE_P indicates the var is marked with attribute 'used'.
// Global register variables don't turn into LLVM GlobalVariables.
if (TREE_CODE(decl) == VAR_DECL && DECL_REGISTER(decl))
return;
timevar_push(TV_LLVM_GLOBALS);
// Get or create the global variable now.
GlobalVariable *GV = cast<GlobalVariable>(DECL_LLVM(decl));
// Convert the initializer over.
Constant *Init;
if (DECL_INITIAL(decl) == 0 || DECL_INITIAL(decl) == error_mark_node) {
// This global should be zero initialized. Reconvert the type in case the
// forward def of the global and the real def differ in type (e.g. declared
// as 'int A[]', and defined as 'int A[100]').
Init = Constant::getNullValue(ConvertType(TREE_TYPE(decl)));
} else {
assert((TREE_CONSTANT(DECL_INITIAL(decl)) ||
TREE_CODE(DECL_INITIAL(decl)) == STRING_CST) &&
"Global initializer should be constant!");
// Temporarily set an initializer for the global, so we don't infinitely
// recurse. If we don't do this, we can hit cases where we see "oh a global
// with an initializer hasn't been initialized yet, call emit_global_to_llvm
// on it". When constructing the initializer it might refer to itself.
// this can happen for things like void *G = &G;
//
GV->setInitializer(UndefValue::get(GV->getType()->getElementType()));
Init = TreeConstantToLLVM::Convert(DECL_INITIAL(decl));
}
// If we had a forward definition that has a type that disagrees with our
// initializer, insert a cast now. This sort of thing occurs when we have a
// global union, and the LLVM type followed a union initializer that is
// different from the union element used for the type.
if (GV->getType()->getElementType() != Init->getType()) {
GV->removeFromParent();
GlobalVariable *NGV = new GlobalVariable(Init->getType(), GV->isConstant(),
GlobalValue::ExternalLinkage, 0,
GV->getName(), TheModule);
GV->replaceAllUsesWith(ConstantExpr::getBitCast(NGV, GV->getType()));
delete GV;
SET_DECL_LLVM(decl, NGV);
GV = NGV;
}
// Set the initializer.
GV->setInitializer(Init);
// Set thread local (TLS)
if (TREE_CODE(decl) == VAR_DECL && DECL_THREAD_LOCAL(decl))
GV->setThreadLocal(true);
// Set the linkage.
if (!TREE_PUBLIC(decl)) {
GV->setLinkage(GlobalValue::InternalLinkage);
} else if (DECL_WEAK(decl) || DECL_ONE_ONLY(decl) ||
(DECL_COMMON(decl) && // DECL_COMMON is only meaningful if no init
(!DECL_INITIAL(decl) || DECL_INITIAL(decl) == error_mark_node))) {
// llvm-gcc also includes DECL_VIRTUAL_P here.
GV->setLinkage(GlobalValue::WeakLinkage);
} else if (DECL_COMDAT(decl)) {
GV->setLinkage(GlobalValue::LinkOnceLinkage);
}
#ifdef TARGET_ADJUST_LLVM_LINKAGE
TARGET_ADJUST_LLVM_LINKAGE(GV,decl);
#endif /* TARGET_ADJUST_LLVM_LINKAGE */
// Handle visibility style
if (TREE_PUBLIC(decl)) {
if (DECL_VISIBILITY(decl) == VISIBILITY_HIDDEN)
GV->setVisibility(GlobalValue::HiddenVisibility);
else if (DECL_VISIBILITY(decl) == VISIBILITY_PROTECTED)
GV->setVisibility(GlobalValue::ProtectedVisibility);
}
// Set the section for the global.
if (TREE_CODE(decl) == VAR_DECL || TREE_CODE(decl) == CONST_DECL) {
if (DECL_SECTION_NAME(decl)) {
GV->setSection(TREE_STRING_POINTER(DECL_SECTION_NAME(decl)));
#ifdef LLVM_IMPLICIT_TARGET_GLOBAL_VAR_SECTION
} else if (const char *Section =
LLVM_IMPLICIT_TARGET_GLOBAL_VAR_SECTION(decl)) {
GV->setSection(Section);
#endif
}
// Set the alignment for the global if one of the following condition is met
// 1) DECL_ALIGN_UNIT does not match alignment as per ABI specification
// 2) DECL_ALIGN is set by user.
if (DECL_ALIGN_UNIT(decl)) {
unsigned TargetAlign = getTargetData().getABITypeAlignment(GV->getType()->getElementType());
if (DECL_USER_ALIGN(decl) || TargetAlign != DECL_ALIGN_UNIT(decl))
GV->setAlignment(DECL_ALIGN_UNIT(decl));
}
// Handle used decls
if (DECL_PRESERVE_P (decl)) {
const Type *SBP= PointerType::get(Type::Int8Ty);
AttributeUsedGlobals.push_back(ConstantExpr::getBitCast(GV, SBP));
}
// Add annotate attributes for globals
if (DECL_ATTRIBUTES(decl))
AddAnnotateAttrsToGlobal(GV, decl);
}
if (TheDebugInfo) TheDebugInfo->EmitGlobalVariable(GV, decl);
timevar_pop(TV_LLVM_GLOBALS);
}