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Add comdat key field to llvm.global_ctors and llvm.global_dtors

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This allows us to put dynamic initializers for weak data into the same
comdat group as the data being initialized.  This is necessary for MSVC
ABI compatibility.  Once we have comdats for guard variables, we can use
the combination to help GlobalOpt fire more often for weak data with
guarded initialization on other platforms.

Reviewers: nlewycky

Differential Revision: http://reviews.llvm.org/D3499

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2014-05-16 20:39:27 +00:00
parent dedd6203ad
commit 1ce3088669
16 changed files with 289 additions and 69 deletions
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34
docs/LangRef.rst
View File

@ -3152,14 +3152,18 @@ The '``llvm.global_ctors``' Global Variable
.. code-block:: llvm
%0 = type { i32, void ()* }
@llvm.global_ctors = appending global [1 x %0] [%0 { i32 65535, void ()* @ctor }]
%0 = type { i32, void ()*, i8* }
@llvm.global_ctors = appending global [1 x %0] [%0 { i32 65535, void ()* @ctor, i8* @data }]
The ``@llvm.global_ctors`` array contains a list of constructor
functions and associated priorities. The functions referenced by this
array will be called in ascending order of priority (i.e. lowest first)
when the module is loaded. The order of functions with the same priority
is not defined.
functions, priorities, and an optional associated global or function.
The functions referenced by this array will be called in ascending order
of priority (i.e. lowest first) when the module is loaded. The order of
functions with the same priority is not defined.
If the third field is present, non-null, and points to a global variable
or function, the initializer function will only run if the associated
data from the current module is not discarded.
.. _llvmglobaldtors:
@ -3168,14 +3172,18 @@ The '``llvm.global_dtors``' Global Variable
.. code-block:: llvm
%0 = type { i32, void ()* }
@llvm.global_dtors = appending global [1 x %0] [%0 { i32 65535, void ()* @dtor }]
%0 = type { i32, void ()*, i8* }
@llvm.global_dtors = appending global [1 x %0] [%0 { i32 65535, void ()* @dtor, i8* @data }]
The ``@llvm.global_dtors`` array contains a list of destructor functions
and associated priorities. The functions referenced by this array will
be called in descending order of priority (i.e. highest first) when the
module is loaded. The order of functions with the same priority is not
defined.
The ``@llvm.global_dtors`` array contains a list of destructor
functions, priorities, and an optional associated global or function.
The functions referenced by this array will be called in descending
order of priority (i.e. highest first) when the module is loaded. The
order of functions with the same priority is not defined.
If the third field is present, non-null, and points to a global variable
or function, the destructor function will only run if the associated
data from the current module is not discarded.
Instruction Reference
=====================

17
include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
View File

@ -67,10 +67,12 @@ public:
MachineModuleInfo *MMI) const override;
void InitializeELF(bool UseInitArray_);
const MCSection *
getStaticCtorSection(unsigned Priority = 65535) const override;
const MCSection *
getStaticDtorSection(unsigned Priority = 65535) const override;
const MCSection *getStaticCtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const override;
const MCSection *getStaticDtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const override;
};
@ -140,6 +142,13 @@ public:
void emitModuleFlags(MCStreamer &Streamer,
ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
Mangler &Mang, const TargetMachine &TM) const override;
const MCSection *getStaticCtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const override;
const MCSection *getStaticDtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const override;
};
} // end namespace llvm

13
include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -130,14 +130,15 @@ public:
getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
MCStreamer &Streamer) const;
virtual const MCSection *
getStaticCtorSection(unsigned Priority = 65535) const {
(void)Priority;
virtual const MCSection *getStaticCtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const {
return StaticCtorSection;
}
virtual const MCSection *
getStaticDtorSection(unsigned Priority = 65535) const {
(void)Priority;
virtual const MCSection *getStaticDtorSection(unsigned Priority,
const MCSymbol *KeySym,
const MCSection *KeySec) const {
return StaticDtorSection;
}

7
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1700,8 +1700,11 @@ error_code BitcodeReader::GlobalCleanup() {
// Look for global variables which need to be renamed.
for (Module::global_iterator
GI = TheModule->global_begin(), GE = TheModule->global_end();
GI != GE; ++GI)
UpgradeGlobalVariable(GI);
GI != GE;) {
GlobalVariable *GV = GI++;
UpgradeGlobalVariable(GV);
}
// Force deallocation of memory for these vectors to favor the client that
// want lazy deserialization.
std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits);

48
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -1296,6 +1296,15 @@ void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
}
}
namespace {
struct Structor {
Structor() : Priority(0), Func(nullptr), ComdatKey(nullptr) {}
int Priority;
llvm::Constant *Func;
llvm::GlobalValue *ComdatKey;
};
} // end namespace
/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
/// priority.
void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
@ -1307,37 +1316,52 @@ void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
if (!InitList) return; // Not an array!
StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
// FIXME: Only allow the 3-field form in LLVM 4.0.
if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
return; // Not an array of two or three elements!
if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
!isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
return; // Not (int, ptr, ptr).
// Gather the structors in a form that's convenient for sorting by priority.
typedef std::pair<unsigned, Constant *> Structor;
SmallVector<Structor, 8> Structors;
for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
for (Value *O : InitList->operands()) {
ConstantStruct *CS = dyn_cast<ConstantStruct>(O);
if (!CS) continue; // Malformed.
if (CS->getOperand(1)->isNullValue())
break; // Found a null terminator, skip the rest.
ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
if (!Priority) continue; // Malformed.
Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
CS->getOperand(1)));
Structors.push_back(Structor());
Structor &S = Structors.back();
S.Priority = Priority->getLimitedValue(65535);
S.Func = CS->getOperand(1);
if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
S.ComdatKey = dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
}
// Emit the function pointers in the target-specific order
const DataLayout *DL = TM.getDataLayout();
unsigned Align = Log2_32(DL->getPointerPrefAlignment());
std::stable_sort(Structors.begin(), Structors.end(), less_first());
for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
std::stable_sort(Structors.begin(), Structors.end(),
[](const Structor &L,
const Structor &R) { return L.Priority < R.Priority; });
for (Structor &S : Structors) {
const TargetLoweringObjectFile &Obj = getObjFileLowering();
const MCSymbol *KeySym = nullptr;
const MCSection *KeySec = nullptr;
if (S.ComdatKey) {
KeySym = getSymbol(S.ComdatKey);
KeySec = getObjFileLowering().SectionForGlobal(S.ComdatKey, *Mang, TM);
}
const MCSection *OutputSection =
(isCtor ?
getObjFileLowering().getStaticCtorSection(Structors[i].first) :
getObjFileLowering().getStaticDtorSection(Structors[i].first));
(isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym, KeySec)
: Obj.getStaticDtorSection(S.Priority, KeySym, KeySec));
OutStreamer.SwitchSection(OutputSection);
if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
EmitAlignment(Align);
EmitXXStructor(Structors[i].second);
EmitXXStructor(S.Func);
}
}

37
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -339,8 +339,8 @@ getSectionForConstant(SectionKind Kind) const {
return DataRelROSection;
}
const MCSection *
TargetLoweringObjectFileELF::getStaticCtorSection(unsigned Priority) const {
const MCSection *TargetLoweringObjectFileELF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym, const MCSection *KeySec) const {
// The default scheme is .ctor / .dtor, so we have to invert the priority
// numbering.
if (Priority == 65535)
@ -359,8 +359,8 @@ TargetLoweringObjectFileELF::getStaticCtorSection(unsigned Priority) const {
}
}
const MCSection *
TargetLoweringObjectFileELF::getStaticDtorSection(unsigned Priority) const {
const MCSection *TargetLoweringObjectFileELF::getStaticDtorSection(
unsigned Priority, const MCSymbol *KeySym, const MCSection *KeySec) const {
// The default scheme is .ctor / .dtor, so we have to invert the priority
// numbering.
if (Priority == 65535)
@ -865,3 +865,32 @@ emitModuleFlags(MCStreamer &Streamer,
}
}
}
static const MCSection *getAssociativeCOFFSection(MCContext &Ctx,
const MCSection *Sec,
const MCSymbol *KeySym,
const MCSection *KeySec) {
// Return the normal section if we don't have to be associative.
if (!KeySym)
return Sec;
// Make an associative section with the same name and kind as the normal
// section.
const MCSectionCOFF *SecCOFF = cast<MCSectionCOFF>(Sec);
const MCSectionCOFF *KeySecCOFF = cast<MCSectionCOFF>(KeySec);
unsigned Characteristics =
SecCOFF->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT;
return Ctx.getCOFFSection(SecCOFF->getSectionName(), Characteristics,
SecCOFF->getKind(), KeySym->getName(),
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE, KeySecCOFF);
}
const MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym, const MCSection *KeySec) const {
return getAssociativeCOFFSection(getContext(), StaticCtorSection, KeySym, KeySec);
}
const MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection(
unsigned Priority, const MCSymbol *KeySym, const MCSection *KeySec) const {
return getAssociativeCOFFSection(getContext(), StaticDtorSection, KeySym, KeySec);
}

52
lib/IR/AutoUpgrade.cpp
View File

@ -170,7 +170,59 @@ bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
return Upgraded;
}
static bool UpgradeGlobalStructors(GlobalVariable *GV) {
ArrayType *ATy = dyn_cast<ArrayType>(GV->getType()->getElementType());
StructType *OldTy =
ATy ? dyn_cast<StructType>(ATy->getElementType()) : nullptr;
// Only upgrade an array of a two field struct with the appropriate field
// types.
if (!OldTy || OldTy->getNumElements() != 2)
return false;
// Get the upgraded 3 element type.
PointerType *VoidPtrTy = Type::getInt8Ty(GV->getContext())->getPointerTo();
Type *Tys[3] = {
OldTy->getElementType(0),
OldTy->getElementType(1),
VoidPtrTy
};
StructType *NewTy =
StructType::get(GV->getContext(), Tys, /*isPacked=*/false);
// Build new constants with a null third field filled in.
ConstantArray *OldInit = dyn_cast<ConstantArray>(GV->getInitializer());
if (!OldInit)
return false;
std::vector<Constant *> Initializers;
for (Use &U : OldInit->operands()) {
ConstantStruct *Init = cast<ConstantStruct>(&U);
Constant *NewInit =
ConstantStruct::get(NewTy, Init->getOperand(0), Init->getOperand(1),
Constant::getNullValue(VoidPtrTy), nullptr);
Initializers.push_back(NewInit);
}
assert(Initializers.size() == ATy->getNumElements());
// Replace the old GV with a new one.
ATy = ArrayType::get(NewTy, Initializers.size());
Constant *NewInit = ConstantArray::get(ATy, Initializers);
GlobalVariable *NewGV = new GlobalVariable(
*GV->getParent(), ATy, GV->isConstant(), GV->getLinkage(), NewInit, "",
GV, GV->getThreadLocalMode(), GV->getType()->getAddressSpace(),
GV->isExternallyInitialized());
NewGV->copyAttributesFrom(GV);
NewGV->takeName(GV);
assert(GV->use_empty() && "program cannot use initializer list");
GV->eraseFromParent();
return true;
}
bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
if (GV->getName() == "llvm.global_ctors" ||
GV->getName() == "llvm.global_dtors")
return UpgradeGlobalStructors(GV);
// Nothing to do yet.
return false;
}

12
lib/IR/Verifier.cpp
View File

@ -396,14 +396,22 @@ void Verifier::visitGlobalVariable(const GlobalVariable &GV) {
"invalid linkage for intrinsic global variable", &GV);
// Don't worry about emitting an error for it not being an array,
// visitGlobalValue will complain on appending non-array.
if (ArrayType *ATy = dyn_cast<ArrayType>(GV.getType())) {
if (ArrayType *ATy = dyn_cast<ArrayType>(GV.getType()->getElementType())) {
StructType *STy = dyn_cast<StructType>(ATy->getElementType());
PointerType *FuncPtrTy =
FunctionType::get(Type::getVoidTy(*Context), false)->getPointerTo();
Assert1(STy && STy->getNumElements() == 2 &&
// FIXME: Reject the 2-field form in LLVM 4.0.
Assert1(STy && (STy->getNumElements() == 2 ||
STy->getNumElements() == 3) &&
STy->getTypeAtIndex(0u)->isIntegerTy(32) &&
STy->getTypeAtIndex(1) == FuncPtrTy,
"wrong type for intrinsic global variable", &GV);
if (STy->getNumElements() == 3) {
Type *ETy = STy->getTypeAtIndex(2);
Assert1(ETy->isPointerTy() &&
cast<PointerType>(ETy)->getElementType()->isIntegerTy(8),
"wrong type for intrinsic global variable", &GV);
}
}
}

4
lib/Transforms/ObjCARC/ObjCARCAPElim.cpp
View File

@ -155,8 +155,8 @@ bool ObjCARCAPElim::runOnModule(Module &M) {
for (User::op_iterator OI = Init->op_begin(), OE = Init->op_end();
OI != OE; ++OI) {
Value *Op = *OI;
// llvm.global_ctors is an array of pairs where the second members
// are constructor functions.
// llvm.global_ctors is an array of three-field structs where the second
// members are constructor functions.
Function *F = dyn_cast<Function>(cast<ConstantStruct>(Op)->getOperand(1));
// If the user used a constructor function with the wrong signature and
// it got bitcasted or whatever, look the other way.

26
lib/Transforms/Utils/CtorUtils.cpp
View File

@ -29,26 +29,28 @@ namespace {
void installGlobalCtors(GlobalVariable *GCL,
const std::vector<Function *> &Ctors) {
// If we made a change, reassemble the initializer list.
Constant *CSVals[2];
CSVals[0] = ConstantInt::get(Type::getInt32Ty(GCL->getContext()), 65535);
CSVals[1] = nullptr;
Constant *CSVals[3];
StructType *StructTy =
cast<StructType>(GCL->getType()->getElementType()->getArrayElementType());
// Create the new init list.
std::vector<Constant *> CAList;
for (unsigned i = 0, e = Ctors.size(); i != e; ++i) {
if (Ctors[i]) {
CSVals[1] = Ctors[i];
for (Function *F : Ctors) {
Type *Int32Ty = Type::getInt32Ty(GCL->getContext());
if (F) {
CSVals[0] = ConstantInt::get(Int32Ty, 65535);
CSVals[1] = F;
} else {
Type *FTy = FunctionType::get(Type::getVoidTy(GCL->getContext()), false);
PointerType *PFTy = PointerType::getUnqual(FTy);
CSVals[1] = Constant::getNullValue(PFTy);
CSVals[0] =
ConstantInt::get(Type::getInt32Ty(GCL->getContext()), 0x7fffffff);
CSVals[0] = ConstantInt::get(Int32Ty, 0x7fffffff);
CSVals[1] = Constant::getNullValue(StructTy->getElementType(1));
}
CAList.push_back(ConstantStruct::get(StructTy, CSVals));
// FIXME: Only allow the 3-field form in LLVM 4.0.
size_t NumElts = StructTy->getNumElements();
if (NumElts > 2)
CSVals[2] = Constant::getNullValue(StructTy->getElementType(2));
CAList.push_back(
ConstantStruct::get(StructTy, makeArrayRef(CSVals, NumElts)));
}
// Create the array initializer.

27
lib/Transforms/Utils/ModuleUtils.cpp
View File

@ -24,16 +24,16 @@ static void appendToGlobalArray(const char *Array,
Module &M, Function *F, int Priority) {
IRBuilder<> IRB(M.getContext());
FunctionType *FnTy = FunctionType::get(IRB.getVoidTy(), false);
StructType *Ty = StructType::get(
IRB.getInt32Ty(), PointerType::getUnqual(FnTy), NULL);
Constant *RuntimeCtorInit = ConstantStruct::get(
Ty, IRB.getInt32(Priority), F, NULL);
// Get the current set of static global constructors and add the new ctor
// to the list.
SmallVector<Constant *, 16> CurrentCtors;
StructType *EltTy;
if (GlobalVariable *GVCtor = M.getNamedGlobal(Array)) {
// If there is a global_ctors array, use the existing struct type, which can
// have 2 or 3 fields.
ArrayType *ATy = cast<ArrayType>(GVCtor->getType()->getElementType());
EltTy = cast<StructType>(ATy->getElementType());
if (Constant *Init = GVCtor->getInitializer()) {
unsigned n = Init->getNumOperands();
CurrentCtors.reserve(n + 1);
@ -41,13 +41,26 @@ static void appendToGlobalArray(const char *Array,
CurrentCtors.push_back(cast<Constant>(Init->getOperand(i)));
}
GVCtor->eraseFromParent();
} else {
// Use a simple two-field struct if there isn't one already.
EltTy = StructType::get(IRB.getInt32Ty(), PointerType::getUnqual(FnTy),
nullptr);
}
// Build a 2 or 3 field global_ctor entry. We don't take a comdat key.
Constant *CSVals[3];
CSVals[0] = IRB.getInt32(Priority);
CSVals[1] = F;
// FIXME: Drop support for the two element form in LLVM 4.0.
if (EltTy->getNumElements() >= 3)
CSVals[2] = llvm::Constant::getNullValue(IRB.getInt8PtrTy());
Constant *RuntimeCtorInit =
ConstantStruct::get(EltTy, makeArrayRef(CSVals, EltTy->getNumElements()));
CurrentCtors.push_back(RuntimeCtorInit);
// Create a new initializer.
ArrayType *AT = ArrayType::get(RuntimeCtorInit->getType(),
CurrentCtors.size());
ArrayType *AT = ArrayType::get(EltTy, CurrentCtors.size());
Constant *NewInit = ConstantArray::get(AT, CurrentCtors);
// Create the new global variable and replace all uses of

BIN
test/Linker/Inputs/old_global_ctors.3.4.bc Normal file
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Binary file not shown.

29
test/Linker/global_ctors.ll Normal file
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@ -0,0 +1,29 @@
; RUN: llvm-as %s -o %t.new.bc
; RUN: llvm-link %t.new.bc %S/Inputs/old_global_ctors.3.4.bc | llvm-dis | FileCheck %s
; old_global_ctors.3.4.bc contains the following LLVM IL, assembled into
; bitcode by llvm-as from 3.4. It uses a two element @llvm.global_ctors array.
; ---
; declare void @a_global_ctor()
; declare void @b_global_ctor()
;
; @llvm.global_ctors = appending global [2 x { i32, void ()* } ] [
; { i32, void ()* } { i32 65535, void ()* @a_global_ctor },
; { i32, void ()* } { i32 65535, void ()* @b_global_ctor }
; ]
; ---
declare void @c_global_ctor()
declare void @d_global_ctor()
@llvm.global_ctors = appending global [2 x { i32, void ()*, i8* } ] [
{ i32, void ()*, i8* } { i32 65535, void ()* @c_global_ctor, i8* null },
{ i32, void ()*, i8* } { i32 65535, void ()* @d_global_ctor, i8* null }
]
; CHECK: @llvm.global_ctors = appending global [4 x { i32, void ()*, i8* }] [
; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @a_global_ctor, i8* null }
; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @b_global_ctor, i8* null }
; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @c_global_ctor, i8* null }
; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @d_global_ctor, i8* null }
; CHECK: ]

20
test/MC/COFF/global_ctors_dtors.ll
View File

@ -9,8 +9,13 @@
@.str2 = private unnamed_addr constant [12 x i8] c"destructing\00", align 1
@.str3 = private unnamed_addr constant [5 x i8] c"main\00", align 1
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @a_global_ctor }]
@llvm.global_dtors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @a_global_dtor }]
%ini = type { i32, void()*, i8* }
@llvm.global_ctors = appending global [2 x %ini ] [
%ini { i32 65535, void ()* @a_global_ctor, i8* null },
%ini { i32 65535, void ()* @b_global_ctor, i8* bitcast (i32* @b to i8*) }
]
@llvm.global_dtors = appending global [1 x %ini ] [%ini { i32 65535, void ()* @a_global_dtor, i8* null }]
declare i32 @puts(i8*)
@ -19,6 +24,13 @@ define void @a_global_ctor() nounwind {
ret void
}
@b = global i32 zeroinitializer
define void @b_global_ctor() nounwind {
store i32 42, i32* @b
ret void
}
define void @a_global_dtor() nounwind {
%1 = call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @.str2, i32 0, i32 0))
ret void
@ -31,9 +43,13 @@ define i32 @main() nounwind {
; WIN32: .section .CRT$XCU,"rd"
; WIN32: a_global_ctor
; WIN32: .section .CRT$XCU,"rd",associative .bss,{{_?}}b
; WIN32: b_global_ctor
; WIN32: .section .CRT$XTX,"rd"
; WIN32: a_global_dtor
; MINGW32: .section .ctors,"wd"
; MINGW32: a_global_ctor
; MINGW32: .section .ctors,"wd",associative .bss,{{_?}}b
; MINGW32: b_global_ctor
; MINGW32: .section .dtors,"wd"
; MINGW32: a_global_dtor

19
test/Transforms/GlobalOpt/ctor-list-opt.ll
View File

@ -1,5 +1,20 @@
; RUN: opt < %s -globalopt -S | not grep CTOR
@llvm.global_ctors = appending global [11 x { i32, void ()* }] [ { i32, void ()* } { i32 65535, void ()* @CTOR1 }, { i32, void ()* } { i32 65535, void ()* @CTOR1 }, { i32, void ()* } { i32 65535, void ()* @CTOR2 }, { i32, void ()* } { i32 65535, void ()* @CTOR3 }, { i32, void ()* } { i32 65535, void ()* @CTOR4 }, { i32, void ()* } { i32 65535, void ()* @CTOR5 }, { i32, void ()* } { i32 65535, void ()* @CTOR6 }, { i32, void ()* } { i32 65535, void ()* @CTOR7 }, { i32, void ()* } { i32 65535, void ()* @CTOR8 }, { i32, void ()* } { i32 65535, void ()* @CTOR9 }, { i32, void ()* } { i32 2147483647, void ()* null } ] ; <[10 x { i32, void ()* }]*> [#uses=0]
; RUN: opt < %s -globalopt -S | FileCheck %s
; CHECK-NOT: CTOR
%ini = type { i32, void()*, i8* }
@llvm.global_ctors = appending global [11 x %ini] [
%ini { i32 65535, void ()* @CTOR1, i8* null },
%ini { i32 65535, void ()* @CTOR1, i8* null },
%ini { i32 65535, void ()* @CTOR2, i8* null },
%ini { i32 65535, void ()* @CTOR3, i8* null },
%ini { i32 65535, void ()* @CTOR4, i8* null },
%ini { i32 65535, void ()* @CTOR5, i8* null },
%ini { i32 65535, void ()* @CTOR6, i8* null },
%ini { i32 65535, void ()* @CTOR7, i8* null },
%ini { i32 65535, void ()* @CTOR8, i8* null },
%ini { i32 65535, void ()* @CTOR9, i8* null },
%ini { i32 2147483647, void ()* null, i8* null }
]
@G = global i32 0 ; <i32*> [#uses=1]
@G2 = global i32 0 ; <i32*> [#uses=1]
@G3 = global i32 -123 ; <i32*> [#uses=2]

11
test/Verifier/global-ctors.ll Normal file
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@ -0,0 +1,11 @@
; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
@llvm.global_ctors = appending global [1 x { i32, void()*, i8 } ] [
{ i32, void()*, i8 } { i32 65535, void ()* null, i8 0 }
]
; CHECK: wrong type for intrinsic global variable
@llvm.global_dtors = appending global [1 x { i32, void()*, i8*, i8 } ] [
{ i32, void()*, i8*, i8 } { i32 65535, void ()* null, i8* null, i8 0}
]
; CHECK: wrong type for intrinsic global variable