r189996 - Do not emit duplicate global initializers for template static data members inside namespaces
David Blaikie
dblaikie at gmail.com
Wed Sep 4 14:07:38 PDT 2013
Author: dblaikie
Date: Wed Sep 4 16:07:37 2013
New Revision: 189996
URL: http://llvm.org/viewvc/llvm-project?rev=189996&view=rev
Log:
Do not emit duplicate global initializers for template static data members inside namespaces
A quirk of AST representation leads to class template static data member
definitions being visited twice during Clang IRGen resulting in
duplicate (benign) initializers.
Discovered while investigating a possibly-related debug info bug tickled
by the duplicate emission of these members & their associated debug
info.
With thanks to Richard Smith for help investigating, understanding, and
helping with the fix.
Modified:
cfe/trunk/lib/CodeGen/CodeGenModule.cpp
cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp
Modified: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.cpp?rev=189996&r1=189995&r2=189996&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenModule.cpp (original)
+++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp Wed Sep 4 16:07:37 2013
@@ -2761,8 +2761,13 @@ void CodeGenModule::EmitObjCIvarInitiali
/// EmitNamespace - Emit all declarations in a namespace.
void CodeGenModule::EmitNamespace(const NamespaceDecl *ND) {
for (RecordDecl::decl_iterator I = ND->decls_begin(), E = ND->decls_end();
- I != E; ++I)
+ I != E; ++I) {
+ if (const VarDecl *VD = dyn_cast<VarDecl>(*I))
+ if (VD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
+ VD->getTemplateSpecializationKind() != TSK_Undeclared)
+ continue;
EmitTopLevelDecl(*I);
+ }
}
// EmitLinkageSpec - Emit all declarations in a linkage spec.
Modified: cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp?rev=189996&r1=189995&r2=189996&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/static-member-variable-explicit-specialization.cpp Wed Sep 4 16:07:37 2013
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -std=c++1y -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
// CHECK: ; ModuleID
extern "C" int foo();
@@ -12,11 +12,13 @@ template<> int A<char>::a;
// CHECK: @_ZN1AIbE1aE = global i32 10
template<> int A<bool>::a = 10;
-// CHECK: @llvm.global_ctors = appending global [5 x { i32, void ()* }]
+// CHECK: @llvm.global_ctors = appending global [7 x { i32, void ()* }]
// CHECK: [{ i32, void ()* } { i32 65535, void ()* @[[unordered1:[^ ]*]] },
// CHECK: { i32, void ()* } { i32 65535, void ()* @[[unordered2:[^ ]*]] },
// CHECK: { i32, void ()* } { i32 65535, void ()* @[[unordered3:[^ ]*]] },
// CHECK: { i32, void ()* } { i32 65535, void ()* @[[unordered4:[^ ]*]] },
+// CHECK: { i32, void ()* } { i32 65535, void ()* @[[unordered5:[^ ]*]] },
+// CHECK: { i32, void ()* } { i32 65535, void ()* @[[unordered6:[^ ]*]] },
// CHECK: { i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
template int A<short>::a; // Unordered
@@ -37,6 +39,19 @@ template short x<short>; // Unordered
template<> int x<int> = foo();
int e = x<char>; // Unordered
+namespace ns {
+template <typename T> struct a {
+ static int i;
+};
+template<typename T> int a<T>::i = foo();
+template struct a<int>;
+
+struct b {
+ template <typename T> static T i;
+};
+template<typename T> T b::i<T> = foo();
+template int b::i<int>;
+}
// CHECK: define internal void @[[unordered1]]
// CHECK: call i32 @foo()
// CHECK: store {{.*}} @_ZN1AIsE1aE
@@ -49,11 +64,21 @@ int e = x<char>; // Unordered
// CHECK: define internal void @[[unordered3]]
// CHECK: call i32 @foo()
-// CHECK: store {{.*}} @_ZN1AIvE1aE
+// CHECK: store {{.*}} @_ZN2ns1aIiE1iE
// CHECK: ret
// CHECK: define internal void @[[unordered4]]
// CHECK: call i32 @foo()
+// CHECK: store {{.*}} @_ZN2ns1b1iIiEE
+// CHECK: ret
+
+// CHECK: define internal void @[[unordered5]]
+// CHECK: call i32 @foo()
+// CHECK: store {{.*}} @_ZN1AIvE1aE
+// CHECK: ret
+
+// CHECK: define internal void @[[unordered6]]
+// CHECK: call i32 @foo()
// CHECK: store {{.*}} @_Z1xIcE
// CHECK: ret
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