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[OpenMP] Make Ctor / Dtor functions have external visibility 

The default construction of constructor functions by LLVM tends to make
them have internal linkage. When we call a ctor / dtor function in the
target region we are actually creating a kernel that is called at
registration. Because the ctor is a kernel we need to make sure it's
externally visible so we can actually call it. This prevented AMDGPU
from correctly using constructors while NVPTX could use them simply
because it ignored internal visibility.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D122504
This commit is contained in:
Joseph Huber 2022-03-25 16:36:57 -04:00
parent e13faa40cf
commit 3c6d32ec6c
6 changed files with 30 additions and 30 deletions
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8
clang/lib/CodeGen/CGDeclCXX.cpp
View File

@ -425,9 +425,8 @@ void CodeGenFunction::EmitCXXGuardedInitBranch(llvm::Value *NeedsInit,
llvm::Function *CodeGenModule::CreateGlobalInitOrCleanUpFunction(
llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
SourceLocation Loc, bool TLS) {
llvm::Function *Fn = llvm::Function::Create(
FTy, llvm::GlobalValue::InternalLinkage, Name, &getModule());
SourceLocation Loc, bool TLS, llvm::GlobalVariable::LinkageTypes Linkage) {
llvm::Function *Fn = llvm::Function::Create(FTy, Linkage, Name, &getModule());
if (!getLangOpts().AppleKext && !TLS) {
// Set the section if needed.
@ -435,7 +434,8 @@ llvm::Function *CodeGenModule::CreateGlobalInitOrCleanUpFunction(
Fn->setSection(Section);
}
SetInternalFunctionAttributes(GlobalDecl(), Fn, FI);
if (Linkage == llvm::GlobalVariable::InternalLinkage)
SetInternalFunctionAttributes(GlobalDecl(), Fn, FI);
Fn->setCallingConv(getRuntimeCC());

8
clang/lib/CodeGen/CGOpenMPRuntime.cpp
View File

@ -1926,7 +1926,8 @@ bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
llvm::Function *Fn = CGM.CreateGlobalInitOrCleanUpFunction(
FTy, Twine(Buffer, "_ctor"), FI, Loc);
FTy, Twine(Buffer, "_ctor"), FI, Loc, false,
llvm::GlobalValue::WeakODRLinkage);
auto NL = ApplyDebugLocation::CreateEmpty(CtorCGF);
CtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, Fn, FI,
FunctionArgList(), Loc, Loc);
@ -1944,7 +1945,6 @@ bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
CtorCGF.FinishFunction();
Ctor = Fn;
ID = llvm::ConstantExpr::getBitCast(Fn, CGM.Int8PtrTy);
CGM.addUsedGlobal(cast<llvm::GlobalValue>(Ctor));
} else {
Ctor = new llvm::GlobalVariable(
CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true,
@ -1970,7 +1970,8 @@ bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
const CGFunctionInfo &FI = CGM.getTypes().arrangeNullaryFunction();
llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FI);
llvm::Function *Fn = CGM.CreateGlobalInitOrCleanUpFunction(
FTy, Twine(Buffer, "_dtor"), FI, Loc);
FTy, Twine(Buffer, "_dtor"), FI, Loc, false,
llvm::GlobalValue::WeakODRLinkage);
auto NL = ApplyDebugLocation::CreateEmpty(DtorCGF);
DtorCGF.StartFunction(GlobalDecl(), CGM.getContext().VoidTy, Fn, FI,
FunctionArgList(), Loc, Loc);
@ -1989,7 +1990,6 @@ bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
DtorCGF.FinishFunction();
Dtor = Fn;
ID = llvm::ConstantExpr::getBitCast(Fn, CGM.Int8PtrTy);
CGM.addUsedGlobal(cast<llvm::GlobalValue>(Dtor));
} else {
Dtor = new llvm::GlobalVariable(
CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true,

4
clang/lib/CodeGen/CodeGenModule.h
View File

@ -826,7 +826,9 @@ public:
llvm::Function *CreateGlobalInitOrCleanUpFunction(
llvm::FunctionType *ty, const Twine &name, const CGFunctionInfo &FI,
SourceLocation Loc = SourceLocation(), bool TLS = false);
SourceLocation Loc = SourceLocation(), bool TLS = false,
llvm::GlobalVariable::LinkageTypes Linkage =
llvm::GlobalVariable::InternalLinkage);
/// Return the AST address space of the underlying global variable for D, as
/// determined by its declaration. Normally this is the same as the address

33
clang/test/OpenMP/amdgcn_target_global_constructor.cpp
View File

@ -26,9 +26,8 @@ S A;
// CHECK: @__omp_rtl_assume_threads_oversubscription = weak_odr hidden addrspace(1) constant i32 0
// CHECK: @__omp_rtl_assume_no_thread_state = weak_odr hidden addrspace(1) constant i32 0
// CHECK: @A = addrspace(1) global %struct.S zeroinitializer, align 4
// CHECK: @llvm.used = appending addrspace(1) global [2 x i8*] [i8* bitcast (void ()* @__omp_offloading_{{.*}}_ctor to i8*), i8* bitcast (void ()* @__omp_offloading_{{.*}}_dtor to i8*)], section "llvm.metadata"
//.
// CHECK-LABEL: define {{[^@]+}}@__omp_offloading_{{.*}}_ctor
// CHECK-LABEL: define {{[^@]+}}@__omp_offloading__fd02_613a0d56_A_l19_ctor
// CHECK-SAME: () #[[ATTR0:[0-9]+]] {
// CHECK-NEXT: entry:
// CHECK-NEXT: call void @_ZN1SC1Ev(%struct.S* noundef nonnull align 4 dereferenceable(4) addrspacecast ([[STRUCT_S:%.*]] addrspace(1)* @A to %struct.S*)) #[[ATTR3:[0-9]+]]
@ -46,7 +45,7 @@ S A;
// CHECK-NEXT: ret void
//
//
// CHECK-LABEL: define {{[^@]+}}@__omp_offloading_{{.*}}_dtor
// CHECK-LABEL: define {{[^@]+}}@__omp_offloading__fd02_613a0d56_A_l19_dtor
// CHECK-SAME: () #[[ATTR0]] {
// CHECK-NEXT: entry:
// CHECK-NEXT: call void @_ZN1SD1Ev(%struct.S* noundef nonnull align 4 dereferenceable(4) addrspacecast ([[STRUCT_S:%.*]] addrspace(1)* @A to %struct.S*)) #[[ATTR4:[0-9]+]]
@ -87,19 +86,19 @@ S A;
// CHECK-NEXT: ret void
//
//.
// CHECK: attributes #0 = { convergent
// CHECK: attributes #1 = { convergent
// CHECK: attributes #2 = { convergent
// CHECK: attributes #3 = { convergent
// CHECK: attributes #4 = { convergent
// CHECK: attributes #0 = { nounwind "kernel" "min-legal-vector-width"="0" }
// CHECK: attributes #1 = { convergent noinline nounwind optnone "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
// CHECK: attributes #2 = { convergent "frame-pointer"="none" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
// CHECK: attributes #3 = { convergent }
// CHECK: attributes #4 = { convergent nounwind }
//.
// CHECK-DAG: !{i32 0, {{.*}}, !"__omp_offloading_{{.*}}_ctor", i32 19, i32 1}
// CHECK-DAG: !{i32 0, {{.*}}, !"__omp_offloading_{{.*}}_dtor", i32 19, i32 2}
// CHECK-DAG: !{i32 1, !"A", i32 0, i32 0}
// CHECK-DAG: !{void ()* @__omp_offloading_{{.*}}_ctor, !"kernel", i32 1}
// CHECK-DAG: !{void ()* @__omp_offloading_{{.*}}_dtor, !"kernel", i32 1}
// CHECK-DAG: !{i32 1, !"wchar_size", i32 4}
// CHECK-DAG: !{i32 7, !"openmp", i32 50}
// CHECK-DAG: !{i32 7, !"openmp-device", i32 50}
// CHECK-DAG: !{!"clang version
// CHECK: !0 = !{i32 0, i32 64770, i32 1631194454, !"__omp_offloading__fd02_613a0d56_A_l19_ctor", i32 19, i32 1}
// CHECK: !1 = !{i32 0, i32 64770, i32 1631194454, !"__omp_offloading__fd02_613a0d56_A_l19_dtor", i32 19, i32 2}
// CHECK: !2 = !{i32 1, !"A", i32 0, i32 0}
// CHECK: !3 = !{void ()* @__omp_offloading__fd02_613a0d56_A_l19_ctor, !"kernel", i32 1}
// CHECK: !4 = !{void ()* @__omp_offloading__fd02_613a0d56_A_l19_dtor, !"kernel", i32 1}
// CHECK: !5 = !{i32 1, !"wchar_size", i32 4}
// CHECK: !6 = !{i32 7, !"openmp", i32 50}
// CHECK: !7 = !{i32 7, !"openmp-device", i32 50}
// CHECK: !8 = !{!"clang version 15.0.0"}
//.

1
clang/test/OpenMP/declare_target_codegen.cpp
View File

@ -46,7 +46,6 @@
// CHECK-DAG: [[STAT:@.+stat]] = internal global %struct.S zeroinitializer,
// CHECK-DAG: [[STAT_REF:@.+]] = internal constant %struct.S* [[STAT]]
// CHECK-DAG: @out_decl_target ={{ protected | }}global i32 0,
// CHECK-DAG: @llvm.used = appending global [2 x i8*] [i8* bitcast (void ()* @__omp_offloading__{{.+}}_globals_l[[@LINE+84]]_ctor to i8*), i8* bitcast (void ()* @__omp_offloading__{{.+}}_stat_l[[@LINE+85]]_ctor to i8*)],
// CHECK-DAG: @llvm.compiler.used = appending global [1 x i8*] [i8* bitcast (%struct.S** [[STAT_REF]] to i8*)],
// CHECK-DAG: define {{.*}}i32 @{{.*}}{{foo|bar|baz2|baz3|FA|f_method}}{{.*}}()

6
clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
View File

@ -44,7 +44,7 @@ int caz() { return 0; }
static int c = foo() + bar() + baz();
#pragma omp declare target (c)
// HOST-DAG: @[[C_CTOR:__omp_offloading__.+_c_l44_ctor]] = private constant i8 0
// DEVICE-DAG: define internal void [[C_CTOR:@__omp_offloading__.+_c_l44_ctor]]()
// DEVICE-DAG: define weak_odr void [[C_CTOR:@__omp_offloading__.+_c_l44_ctor]]()
// DEVICE-DAG: call noundef i32 [[FOO]]()
// DEVICE-DAG: call noundef i32 [[BAR]]()
// DEVICE-DAG: call noundef i32 [[BAZ]]()
@ -61,14 +61,14 @@ struct S {
S cd = doo() + car() + caz() + baz();
#pragma omp end declare target
// HOST-DAG: @[[CD_CTOR:__omp_offloading__.+_cd_l61_ctor]] = private constant i8 0
// DEVICE-DAG: define internal void [[CD_CTOR:@__omp_offloading__.+_cd_l61_ctor]]()
// DEVICE-DAG: define weak_odr void [[CD_CTOR:@__omp_offloading__.+_cd_l61_ctor]]()
// DEVICE-DAG: call noundef i32 [[DOO]]()
// DEVICE-DAG: call noundef i32 [[CAR]]()
// DEVICE-DAG: call noundef i32 [[CAZ]]()
// DEVICE-DAG: ret void
// HOST-DAG: @[[CD_DTOR:__omp_offloading__.+_cd_l61_dtor]] = private constant i8 0
// DEVICE-DAG: define internal void [[CD_DTOR:@__omp_offloading__.+_cd_l61_dtor]]()
// DEVICE-DAG: define weak_odr void [[CD_DTOR:@__omp_offloading__.+_cd_l61_dtor]]()
// DEVICE-DAG: call void
// DEVICE-DAG: ret void