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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@324107 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 59 insertions, 0 deletions

diff --git a/test/CodeGen/dso-local-executable.c b/test/CodeGen/dso-local-executable.c
new file mode 100644
index 0000000000..2fbdb0773d
--- /dev/null
+++ b/test/CodeGen/dso-local-executable.c
@@ -0,0 +1,59 @@
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=STATIC %s
+// STATIC-DAG: @bar = external dso_local global i32
+// STATIC-DAG: @weak_bar = extern_weak dso_local global i32
+// STATIC-DAG: declare dso_local void @foo()
+// STATIC-DAG: @baz = dso_local global i32 42
+// STATIC-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie -mpie-copy-relocations %s -o - | FileCheck --check-prefix=PIE-COPY %s
+// PIE-COPY-DAG: @bar = external dso_local global i32
+// PIE-COPY-DAG: @weak_bar = extern_weak global i32
+// PIE-COPY-DAG: declare dso_local void @foo()
+// PIE-COPY-DAG: @baz = dso_local global i32 42
+// PIE-COPY-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie %s -o - | FileCheck --check-prefix=PIE %s
+// PIE-DAG: @bar = external global i32
+// PIE-DAG: @weak_bar = extern_weak global i32
+// PIE-DAG: declare dso_local void @foo()
+// PIE-DAG: @baz = dso_local global i32 42
+// PIE-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -mrelocation-model static -fno-plt %s -o - | FileCheck --check-prefix=NOPLT %s
+// NOPLT-DAG: @bar = external dso_local global i32
+// NOPLT-DAG: @weak_bar = extern_weak dso_local global i32
+// NOPLT-DAG: declare void @foo()
+// NOPLT-DAG: @baz = dso_local global i32 42
+// NOPLT-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -fno-plt -pic-is-pie -mpie-copy-relocations %s -o - | FileCheck --check-prefix=PIE-COPY-NOPLT %s
+// PIE-COPY-NOPLT-DAG: @bar = external dso_local global i32
+// PIE-COPY-NOPLT-DAG: @weak_bar = extern_weak global i32
+// PIE-COPY-NOPLT-DAG: declare void @foo()
+// PIE-COPY-NOPLT-DAG: @baz = dso_local global i32 42
+// PIE-COPY-NOPLT-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -pic-is-pie -fno-plt %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
+// RUN: %clang_cc1 -triple powerpc64le-pc-linux -emit-llvm -mrelocation-model static %s -o - | FileCheck --check-prefix=PIE-NO-PLT %s
+// PIE-NO-PLT-DAG: @bar = external global i32
+// PIE-NO-PLT-DAG: @weak_bar = extern_weak global i32
+// PIE-NO-PLT-DAG: declare void @foo()
+// PIE-NO-PLT-DAG: @baz = dso_local global i32 42
+// PIE-NO-PLT-DAG: define dso_local i32* @zed()
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm %s -o - | FileCheck --check-prefix=SHARED %s
+// SHARED-DAG: @bar = external global i32
+// SHARED-DAG: @weak_bar = extern_weak global i32
+// SHARED-DAG: declare void @foo()
+// SHARED-DAG: @baz = global i32 42
+// SHARED-DAG: define i32* @zed()
+
+extern int bar;
+__attribute__((weak)) extern int weak_bar;
+void foo(void);
+
+int baz = 42;
+int *zed() {
+  foo();
+  return baz ? &weak_bar : &bar;
+}