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Give explicit template instantiations weak linkage (but don't defer 

them). Fixes PR6578.

llvm-svn: 98328
This commit is contained in:
Douglas Gregor 2010-03-12 04:49:06 +00:00
parent b8b94668b6
commit ee3f72299c
10 changed files with 39 additions and 36 deletions
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18
clang/lib/CodeGen/CodeGenModule.cpp
View File

@ -285,8 +285,7 @@ GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD,
break;
case TSK_ExplicitInstantiationDefinition:
// FIXME: explicit instantiation definitions should use weak linkage
return CodeGenModule::GVA_StrongExternal;
return CodeGenModule::GVA_ExplicitTemplateInstantiation;
case TSK_ExplicitInstantiationDeclaration:
case TSK_ImplicitInstantiation:
@ -335,7 +334,8 @@ CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
// In C99 mode, 'inline' functions are guaranteed to have a strong
// definition somewhere else, so we can use available_externally linkage.
return llvm::Function::AvailableExternallyLinkage;
} else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) {
} else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation ||
Linkage == GVA_ExplicitTemplateInstantiation) {
// In C++, the compiler has to emit a definition in every translation unit
// that references the function. We should use linkonce_odr because
// a) if all references in this translation unit are optimized away, we
@ -589,6 +589,7 @@ bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
// static, static inline, always_inline, and extern inline functions can
// always be deferred. Normal inline functions can be deferred in C99/C++.
// Implicit template instantiations can also be deferred in C++.
if (Linkage == GVA_Internal || Linkage == GVA_C99Inline ||
Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
return true;
@ -1043,15 +1044,15 @@ GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) {
switch (TSK) {
case TSK_Undeclared:
case TSK_ExplicitSpecialization:
// FIXME: ExplicitInstantiationDefinition should be weak!
case TSK_ExplicitInstantiationDefinition:
return CodeGenModule::GVA_StrongExternal;
case TSK_ExplicitInstantiationDeclaration:
llvm_unreachable("Variable should not be instantiated");
// Fall through to treat this like any other instantiation.
case TSK_ExplicitInstantiationDefinition:
return CodeGenModule::GVA_ExplicitTemplateInstantiation;
case TSK_ImplicitInstantiation:
return CodeGenModule::GVA_TemplateInstantiation;
}
@ -1171,7 +1172,8 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage);
else
GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
} else if (Linkage == GVA_TemplateInstantiation)
} else if (Linkage == GVA_TemplateInstantiation ||
Linkage == GVA_ExplicitTemplateInstantiation)
GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon &&
!D->hasExternalStorage() && !D->getInit() &&

3
clang/lib/CodeGen/CodeGenModule.h
View File

@ -437,7 +437,8 @@ public:
GVA_C99Inline,
GVA_CXXInline,
GVA_StrongExternal,
GVA_TemplateInstantiation
GVA_TemplateInstantiation,
GVA_ExplicitTemplateInstantiation
};
llvm::GlobalVariable::LinkageTypes

4
clang/test/CXX/temp/temp.spec/temp.explicit/p1-emit.cpp
View File

@ -12,10 +12,10 @@ T X<T>::member1;
template<typename T>
T X<T>::member2 = 17;
// CHECK: @_ZN1XIiE7member1E = global i32 0
// CHECK: @_ZN1XIiE7member1E = weak global i32 0
template int X<int>::member1;
// CHECK: @_ZN1XIiE7member2E = global i32 17
// CHECK: @_ZN1XIiE7member2E = weak global i32 17
template int X<int>::member2;
// For implicit instantiation of

4
clang/test/CodeGenCXX/explicit-instantiation.cpp
View File

@ -1,5 +1,4 @@
// RUN: %clang_cc1 -emit-llvm -triple i686-pc-linux-gnu -o %t %s
// RUN: grep "define i32 @_ZNK4plusIillEclERKiRKl" %t | count 1
// RUN: %clang_cc1 -emit-llvm -triple i686-pc-linux-gnu -o - %s | FileCheck %s
template<typename T, typename U, typename Result>
struct plus {
@ -11,4 +10,5 @@ Result plus<T, U, Result>::operator()(const T& t, const U& u) const {
return t + u;
}
// CHECK: define linkonce_odr i32 @_ZNK4plusIillEclERKiRKl
template struct plus<int, long, long>;

10
clang/test/CodeGenCXX/mangle-exprs.cpp
View File

@ -30,15 +30,15 @@ namespace Casts {
template <int N> T<N> f() { return T<N>(); }
// CHECK: define void @_ZN5Casts8implicitILj4EEEvPN9enable_ifIXleT_Li4EEvE4typeE
// CHECK: define linkonce_odr void @_ZN5Casts8implicitILj4EEEvPN9enable_ifIXleT_Li4EEvE4typeE
template void implicit<4>(void*);
// CHECK: define void @_ZN5Casts6cstyleILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
// CHECK: define linkonce_odr void @_ZN5Casts6cstyleILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
template void cstyle<4>(void*);
// CHECK: define void @_ZN5Casts10functionalILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
// CHECK: define linkonce_odr void @_ZN5Casts10functionalILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
template void functional<4>(void*);
// CHECK: define void @_ZN5Casts7static_ILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
// CHECK: define linkonce_odr void @_ZN5Casts7static_ILj4EEEvPN9enable_ifIXleT_cvjLi4EEvE4typeE
template void static_<4>(void*);
// CHECK: define i64 @_ZN5Casts1fILi6EEENS_1TIXT_EEEv
// CHECK: define linkonce_odr i64 @_ZN5Casts1fILi6EEENS_1TIXT_EEEv
template T<6> f<6>();
}

4
clang/test/CodeGenCXX/mangle-template.cpp
View File

@ -82,7 +82,7 @@ namespace test7 {
X(U*, typename int_c<(meta<T>::value + meta<U>::value)>::type *) { }
};
// CHECK: define void @_ZN5test71XIiEC1IdEEPT_PNS_5int_cIXplL_ZNS_4metaIiE5valueEEsrNS6_IS3_EE5valueEE4typeE
// CHECK: define linkonce_odr void @_ZN5test71XIiEC1IdEEPT_PNS_5int_cIXplL_ZNS_4metaIiE5valueEEsrNS6_IS3_EE5valueEE4typeE
template X<int>::X(double*, float*);
}
@ -101,6 +101,6 @@ namespace test8 {
template<typename T>
void f(int_c<meta<T>::type::value>) { }
// CHECK: define void @_ZN5test81fIiEEvNS_5int_cIXsrNS_4metaIT_E4typeE5valueEEE
// CHECK: define linkonce_odr void @_ZN5test81fIiEEvNS_5int_cIXsrNS_4metaIT_E4typeE5valueEEE
template void f<int>(int_c<sizeof(int)>);
}

16
clang/test/CodeGenCXX/mangle.cpp
View File

@ -250,26 +250,26 @@ void f() { __fill_a<int>(); }
namespace Expressions {
// Unary operators.
// CHECK: define void @_ZN11Expressions2f1ILi1EEEvPAplngT_Li2E_i
// CHECK: define linkonce_odr void @_ZN11Expressions2f1ILi1EEEvPAplngT_Li2E_i
template <int i> void f1(int (*)[(-i) + 2]) { };
template void f1<1>(int (*)[1]);
// CHECK: define void @_ZN11Expressions2f2ILi1EEEvPApsT__i
// CHECK: define linkonce_odr void @_ZN11Expressions2f2ILi1EEEvPApsT__i
template <int i> void f2(int (*)[+i]) { };
template void f2<1>(int (*)[1]);
// Binary operators.
// CHECK: define void @_ZN11Expressions2f3ILi1EEEvPAplT_T__i
// CHECK: define linkonce_odr void @_ZN11Expressions2f3ILi1EEEvPAplT_T__i
template <int i> void f3(int (*)[i+i]) { };
template void f3<1>(int (*)[2]);
// CHECK: define void @_ZN11Expressions2f4ILi1EEEvPAplplLi2ET_T__i
// CHECK: define linkonce_odr void @_ZN11Expressions2f4ILi1EEEvPAplplLi2ET_T__i
template <int i> void f4(int (*)[2 + i+i]) { };
template void f4<1>(int (*)[4]);
// The ternary operator.
// CHECK: define void @_ZN11Expressions2f4ILb1EEEvPAquT_Li1ELi2E_i
// CHECK: define linkonce_odr void @_ZN11Expressions2f4ILb1EEEvPAquT_Li1ELi2E_i
template <bool b> void f4(int (*)[b ? 1 : 2]) { };
template void f4<true>(int (*)[1]);
}
@ -305,7 +305,7 @@ template<typename T, typename = Policy<P, true> > class Alloc
T *allocate(int, const void*) { return 0; }
};
// CHECK: define i8* @_ZN6PR58615AllocIcNS_6PolicyINS_1PELb1EEEE8allocateEiPKv
// CHECK: define linkonce_odr i8* @_ZN6PR58615AllocIcNS_6PolicyINS_1PELb1EEEE8allocateEiPKv
template class Alloc<char>;
}
@ -369,7 +369,7 @@ namespace test0 {
namespace test1 {
template<typename T> struct X { };
template<template<class> class Y, typename T> void f(Y<T>) { }
// CHECK: define void @_ZN5test11fINS_1XEiEEvT_IT0_E
// CHECK: define linkonce_odr void @_ZN5test11fINS_1XEiEEvT_IT0_E
template void f(X<int>);
}
@ -447,7 +447,7 @@ namespace test7 {
void g(zed<&foo::bar>*)
{}
}
// CHECK: define void @_ZN5test81AILZNS_1B5valueEEE3incEv
// CHECK: define linkonce_odr void @_ZN5test81AILZNS_1B5valueEEE3incEv
namespace test8 {
template <int &counter> class A { void inc() { counter++; } };
class B { static int value; };

4
clang/test/CodeGenCXX/member-templates.cpp
View File

@ -15,8 +15,8 @@ struct B {
template<typename T> B::B(T) {}
// CHECK: define void @_ZN1BC1IiEET_(%struct.B* %this, i32)
// CHECK: define void @_ZN1BC2IiEET_(%struct.B* %this, i32)
// CHECK: define linkonce_odr void @_ZN1BC1IiEET_(%struct.B* %this, i32)
// CHECK: define linkonce_odr void @_ZN1BC2IiEET_(%struct.B* %this, i32)
template B::B(int);
template<typename T>

10
clang/test/CodeGenCXX/template-linkage.cpp
View File

@ -6,19 +6,19 @@ template<typename T> struct A {
// Explicit instantiations have external linkage.
// CHECK: define void @_ZN1AIiE1gEv(
// CHECK: define linkonce_odr void @_ZN1AIiE1gEv(
template void A<int>::g();
// CHECK: define void @_ZN1AIfE1fEf(
// CHECK: define void @_ZN1AIfE1gEv(
// CHECK: define linkonce_odr void @_ZN1AIfE1fEf(
// CHECK: define linkonce_odr void @_ZN1AIfE1gEv(
// FIXME: This should also emit the vtable.
template struct A<float>;
// CHECK: define void @_Z1fIiEvT_
// CHECK: define linkonce_odr void @_Z1fIiEvT_
template <typename T> void f(T) { }
template void f<int>(int);
// CHECK: define void @_Z1gIiEvT_
// CHECK: define linkonce_odr void @_Z1gIiEvT_
template <typename T> inline void g(T) { }
template void g<int>(int);

2
clang/test/CodeGenCXX/temporaries.cpp
View File

@ -256,7 +256,7 @@ namespace PR6199 {
struct B { operator A(); };
// CHECK: define void @_ZN6PR61992f2IiEENS_1AET_
// CHECK: define linkonce_odr void @_ZN6PR61992f2IiEENS_1AET_
template<typename T> A f2(T) {
B b;
// CHECK: call void @_ZN6PR61991BcvNS_1AEEv