Recommit r324107.

It now includes a fix to not mark available_externally definitions as
dso_local.

Original message:

Start setting dso_local in clang.

This starts adding dso_local to clang.

The hope is to eventually have TargetMachine::shouldAssumeDsoLocal go
away. My objective for now is to move enough of it to clang to remove
the need for the TargetMachine one to handle PIE copy relocations and
-fno-plt. With that it should then be easy to implement a
-fno-copy-reloc in clang.

This patch just adds the cases where we assume a symbol to be local
based on the file being compiled for an executable or a shared
library.

llvm-svn: 324500

1 files changed, 62 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/dso-local-executable.cpp b/clang/test/CodeGenCXX/dso-local-executable.cpp
new file mode 100644
index 00000000000..cc8d50f09c9
--- /dev/null
+++ b/clang/test/CodeGenCXX/dso-local-executable.cpp
@@ -0,0 +1,62 @@
+// RUN: %clang_cc1 -triple x86_64-pc-linux -mrelocation-model static -O1 -emit-llvm %s -o - | FileCheck --check-prefix=STATIC %s
+// RUN: %clang_cc1 -triple x86_64-pc-linux -mrelocation-model static -fno-plt -O1 -emit-llvm %s -o - | FileCheck --check-prefix=NOPLT %s
+
+// STATIC-DAG: @_ZTV1C = linkonce_odr dso_local unnamed_addr constant
+// STATIC-DAG: @_ZTS1C = linkonce_odr dso_local constant
+// STATIC-DAG: @_ZTI1C = linkonce_odr dso_local constant
+// STATIC-DAG: @_ZZ14useStaticLocalvE3obj = linkonce_odr dso_local global
+// STATIC-DAG: @_ZGVZN5guard1gEvE1a = linkonce_odr dso_local global
+// STATIC-DAG: define dso_local void @_ZN1CC2Ev(
+// STATIC-DAG: define dso_local void @_ZN1CC1Ev(
+// STATIC-DAG: define linkonce_odr dso_local void @_ZN1C3fooEv(
+
+// NOPLT-DAG: @_ZTV1C = linkonce_odr dso_local unnamed_addr constant
+// NOPLT-DAG: @_ZTS1C = linkonce_odr dso_local constant
+// NOPLT-DAG: @_ZTI1C = linkonce_odr dso_local constant
+// NOPLT-DAG: @_ZZ14useStaticLocalvE3obj = linkonce_odr dso_local global
+// NOPLT-DAG: @_ZGVZN5guard1gEvE1a = linkonce_odr dso_local global
+// NOPLT-DAG: define dso_local void @_ZN1CC2Ev(
+// NOPLT-DAG: define dso_local void @_ZN1CC1Ev(
+// NOPLT-DAG: define linkonce_odr dso_local void @_ZN1C3fooEv(
+
+struct C {
+  C();
+  virtual void foo() {}
+};
+C::C() {}
+
+struct HasVTable {
+  virtual void f();
+};
+inline HasVTable &useStaticLocal() {
+  static HasVTable obj;
+  return obj;
+}
+void useit() {
+  useStaticLocal();
+}
+
+namespace guard {
+int f();
+inline int g() {
+  static int a = f();
+  return a;
+}
+int h() {
+  return g();
+}
+} // namespace guard
+
+
+// STATIC-DAG: define available_externally dso_local void @_ZN5test23barIcEC1Ev(
+// NOPLT-DAG: define available_externally void @_ZN5test23barIcEC1Ev(
+namespace test2 {
+void foo();
+template <typename T>
+struct bar {
+  virtual void zed();
+  bar() { foo(); }
+};
+extern template class bar<char>;
+bar<char> abc;
+} // namespace test2