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-rw-r--r--clang/lib/CodeGen/CGDeclCXX.cpp13
-rw-r--r--clang/lib/CodeGen/CGOpenMPRuntime.cpp130
-rw-r--r--clang/lib/CodeGen/CGOpenMPRuntime.h8
-rw-r--r--clang/lib/CodeGen/CodeGenFunction.h5
-rw-r--r--clang/lib/CodeGen/CodeGenModule.h14
-rw-r--r--clang/lib/CodeGen/ItaniumCXXABI.cpp8
6 files changed, 29 insertions, 149 deletions
diff --git a/clang/lib/CodeGen/CGDeclCXX.cpp b/clang/lib/CodeGen/CGDeclCXX.cpp
index 3fa28b3..e08a1e5 100644
--- a/clang/lib/CodeGen/CGDeclCXX.cpp
+++ b/clang/lib/CodeGen/CGDeclCXX.cpp
@@ -327,6 +327,15 @@ void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
registerGlobalDtorWithAtExit(dtorStub);
}
+/// Register a global destructor using the LLVM 'llvm.global_dtors' global.
+void CodeGenFunction::registerGlobalDtorWithLLVM(const VarDecl &VD,
+ llvm::FunctionCallee Dtor,
+ llvm::Constant *Addr) {
+ // Create a function which calls the destructor.
+ llvm::Function *dtorStub = createAtExitStub(VD, Dtor, Addr);
+ CGM.AddGlobalDtor(dtorStub);
+}
+
void CodeGenFunction::registerGlobalDtorWithAtExit(llvm::Constant *dtorStub) {
// extern "C" int atexit(void (*f)(void));
assert(dtorStub->getType() ==
@@ -519,10 +528,6 @@ CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
D->hasAttr<CUDASharedAttr>()))
return;
- if (getLangOpts().OpenMP &&
- getOpenMPRuntime().emitDeclareTargetVarDefinition(D, Addr, PerformInit))
- return;
-
// Check if we've already initialized this decl.
auto I = DelayedCXXInitPosition.find(D);
if (I != DelayedCXXInitPosition.end() && I->second == ~0U)
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index a8e1150..d2be814 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -1747,136 +1747,6 @@ llvm::Function *CGOpenMPRuntime::emitThreadPrivateVarDefinition(
return nullptr;
}
-bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
- llvm::GlobalVariable *Addr,
- bool PerformInit) {
- if (CGM.getLangOpts().OMPTargetTriples.empty() &&
- !CGM.getLangOpts().OpenMPIsTargetDevice)
- return false;
- std::optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
- OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
- if (!Res || *Res == OMPDeclareTargetDeclAttr::MT_Link ||
- ((*Res == OMPDeclareTargetDeclAttr::MT_To ||
- *Res == OMPDeclareTargetDeclAttr::MT_Enter) &&
- HasRequiresUnifiedSharedMemory))
- return CGM.getLangOpts().OpenMPIsTargetDevice;
- VD = VD->getDefinition(CGM.getContext());
- assert(VD && "Unknown VarDecl");
-
- if (!DeclareTargetWithDefinition.insert(CGM.getMangledName(VD)).second)
- return CGM.getLangOpts().OpenMPIsTargetDevice;
-
- QualType ASTTy = VD->getType();
- SourceLocation Loc = VD->getCanonicalDecl()->getBeginLoc();
-
- // Produce the unique prefix to identify the new target regions. We use
- // the source location of the variable declaration which we know to not
- // conflict with any target region.
- llvm::TargetRegionEntryInfo EntryInfo =
- getEntryInfoFromPresumedLoc(CGM, OMPBuilder, Loc, VD->getName());
- SmallString<128> Buffer, Out;
- OMPBuilder.OffloadInfoManager.getTargetRegionEntryFnName(Buffer, EntryInfo);
-
- const Expr *Init = VD->getAnyInitializer();
- if (CGM.getLangOpts().CPlusPlus && PerformInit) {
- llvm::Constant *Ctor;
- llvm::Constant *ID;
- if (CGM.getLangOpts().OpenMPIsTargetDevice) {
- // Generate function that re-emits the declaration's initializer into
- // the threadprivate copy of the variable VD
- CodeGenFunction CtorCGF(CGM);
-
- const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
- llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
- llvm::Function *Fn = CGM.CreateGlobalInitOrCleanUpFunction(
- FTy, Twine(Buffer, "_ctor"), FI, Loc, false,
- llvm::GlobalValue::WeakODRLinkage);
- Fn->setVisibility(llvm::GlobalValue::ProtectedVisibility);
- if (CGM.getTriple().isAMDGCN())
- Fn->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
- auto NL = ApplyDebugLocation::CreateEmpty(CtorCGF);
- CtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, Fn, FI,
- FunctionArgList(), Loc, Loc);
- auto AL = ApplyDebugLocation::CreateArtificial(CtorCGF);
- llvm::Constant *AddrInAS0 = Addr;
- if (Addr->getAddressSpace() != 0)
- AddrInAS0 = llvm::ConstantExpr::getAddrSpaceCast(
- Addr, llvm::PointerType::get(CGM.getLLVMContext(), 0));
- CtorCGF.EmitAnyExprToMem(Init,
- Address(AddrInAS0, Addr->getValueType(),
- CGM.getContext().getDeclAlign(VD)),
- Init->getType().getQualifiers(),
- /*IsInitializer=*/true);
- CtorCGF.FinishFunction();
- Ctor = Fn;
- ID = Fn;
- } else {
- Ctor = new llvm::GlobalVariable(
- CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true,
- llvm::GlobalValue::PrivateLinkage,
- llvm::Constant::getNullValue(CGM.Int8Ty), Twine(Buffer, "_ctor"));
- ID = Ctor;
- }
-
- // Register the information for the entry associated with the constructor.
- Out.clear();
- auto CtorEntryInfo = EntryInfo;
- CtorEntryInfo.ParentName = Twine(Buffer, "_ctor").toStringRef(Out);
- OMPBuilder.OffloadInfoManager.registerTargetRegionEntryInfo(
- CtorEntryInfo, Ctor, ID,
- llvm::OffloadEntriesInfoManager::OMPTargetRegionEntryCtor);
- }
- if (VD->getType().isDestructedType() != QualType::DK_none) {
- llvm::Constant *Dtor;
- llvm::Constant *ID;
- if (CGM.getLangOpts().OpenMPIsTargetDevice) {
- // Generate function that emits destructor call for the threadprivate
- // copy of the variable VD
- CodeGenFunction DtorCGF(CGM);
-
- const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
- llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
- llvm::Function *Fn = CGM.CreateGlobalInitOrCleanUpFunction(
- FTy, Twine(Buffer, "_dtor"), FI, Loc, false,
- llvm::GlobalValue::WeakODRLinkage);
- Fn->setVisibility(llvm::GlobalValue::ProtectedVisibility);
- if (CGM.getTriple().isAMDGCN())
- Fn->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
- auto NL = ApplyDebugLocation::CreateEmpty(DtorCGF);
- DtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, Fn, FI,
- FunctionArgList(), Loc, Loc);
- // Create a scope with an artificial location for the body of this
- // function.
- auto AL = ApplyDebugLocation::CreateArtificial(DtorCGF);
- llvm::Constant *AddrInAS0 = Addr;
- if (Addr->getAddressSpace() != 0)
- AddrInAS0 = llvm::ConstantExpr::getAddrSpaceCast(
- Addr, llvm::PointerType::get(CGM.getLLVMContext(), 0));
- DtorCGF.emitDestroy(Address(AddrInAS0, Addr->getValueType(),
- CGM.getContext().getDeclAlign(VD)),
- ASTTy, DtorCGF.getDestroyer(ASTTy.isDestructedType()),
- DtorCGF.needsEHCleanup(ASTTy.isDestructedType()));
- DtorCGF.FinishFunction();
- Dtor = Fn;
- ID = Fn;
- } else {
- Dtor = new llvm::GlobalVariable(
- CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true,
- llvm::GlobalValue::PrivateLinkage,
- llvm::Constant::getNullValue(CGM.Int8Ty), Twine(Buffer, "_dtor"));
- ID = Dtor;
- }
- // Register the information for the entry associated with the destructor.
- Out.clear();
- auto DtorEntryInfo = EntryInfo;
- DtorEntryInfo.ParentName = Twine(Buffer, "_dtor").toStringRef(Out);
- OMPBuilder.OffloadInfoManager.registerTargetRegionEntryInfo(
- DtorEntryInfo, Dtor, ID,
- llvm::OffloadEntriesInfoManager::OMPTargetRegionEntryDtor);
- }
- return CGM.getLangOpts().OpenMPIsTargetDevice;
-}
-
void CGOpenMPRuntime::emitDeclareTargetFunction(const FunctionDecl *FD,
llvm::GlobalValue *GV) {
std::optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.h b/clang/lib/CodeGen/CGOpenMPRuntime.h
index 0c4ad46..b01b39a 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.h
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.h
@@ -1089,14 +1089,6 @@ public:
SourceLocation Loc, bool PerformInit,
CodeGenFunction *CGF = nullptr);
- /// Emit a code for initialization of declare target variable.
- /// \param VD Declare target variable.
- /// \param Addr Address of the global variable \a VD.
- /// \param PerformInit true if initialization expression is not constant.
- virtual bool emitDeclareTargetVarDefinition(const VarDecl *VD,
- llvm::GlobalVariable *Addr,
- bool PerformInit);
-
/// Emit code for handling declare target functions in the runtime.
/// \param FD Declare target function.
/// \param Addr Address of the global \a FD.
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index bb8c144..b4c634d 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -4536,6 +4536,11 @@ public:
void registerGlobalDtorWithAtExit(const VarDecl &D, llvm::FunctionCallee fn,
llvm::Constant *addr);
+ /// Registers the dtor using 'llvm.global_dtors' for platforms that do not
+ /// support an 'atexit()' function.
+ void registerGlobalDtorWithLLVM(const VarDecl &D, llvm::FunctionCallee fn,
+ llvm::Constant *addr);
+
/// Call atexit() with function dtorStub.
void registerGlobalDtorWithAtExit(llvm::Constant *dtorStub);
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 793861f..e81edc9 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -1570,6 +1570,13 @@ public:
const VarDecl *D,
ForDefinition_t IsForDefinition = NotForDefinition);
+ // FIXME: Hardcoding priority here is gross.
+ void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
+ unsigned LexOrder = ~0U,
+ llvm::Constant *AssociatedData = nullptr);
+ void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535,
+ bool IsDtorAttrFunc = false);
+
private:
llvm::Constant *GetOrCreateLLVMFunction(
StringRef MangledName, llvm::Type *Ty, GlobalDecl D, bool ForVTable,
@@ -1641,13 +1648,6 @@ private:
void EmitPointerToInitFunc(const VarDecl *VD, llvm::GlobalVariable *Addr,
llvm::Function *InitFunc, InitSegAttr *ISA);
- // FIXME: Hardcoding priority here is gross.
- void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
- unsigned LexOrder = ~0U,
- llvm::Constant *AssociatedData = nullptr);
- void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535,
- bool IsDtorAttrFunc = false);
-
/// EmitCtorList - Generates a global array of functions and priorities using
/// the given list and name. This array will have appending linkage and is
/// suitable for use as a LLVM constructor or destructor array. Clears Fns.
diff --git a/clang/lib/CodeGen/ItaniumCXXABI.cpp b/clang/lib/CodeGen/ItaniumCXXABI.cpp
index 89a2127..7398f49 100644
--- a/clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -2794,6 +2794,14 @@ void ItaniumCXXABI::registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D,
if (D.isNoDestroy(CGM.getContext()))
return;
+ // OpenMP offloading supports C++ constructors and destructors but we do not
+ // always have 'atexit' available. Instead lower these to use the LLVM global
+ // destructors which we can handle directly in the runtime. Note that this is
+ // not strictly 1-to-1 with using `atexit` because we no longer tear down
+ // globals in reverse order of when they were constructed.
+ if (!CGM.getLangOpts().hasAtExit() && !D.isStaticLocal())
+ return CGF.registerGlobalDtorWithLLVM(D, dtor, addr);
+
// emitGlobalDtorWithCXAAtExit will emit a call to either __cxa_thread_atexit
// or __cxa_atexit depending on whether this VarDecl is a thread-local storage
// or not. CXAAtExit controls only __cxa_atexit, so use it if it is enabled.
generated by cgit v1.1 at 2025-07-31 03:25:55 +0000