Decouple dllexport/dllimport from linkage

Representing dllexport/dllimport as distinct linkage types prevents using
these attributes on templates and inline functions.

Instead of introducing further mixed linkage types to include linkonce and
weak ODR, the old import/export linkage types are replaced with a new
separate visibility-like specifier:

  define available_externally dllimport void @f() {}
  @Var = dllexport global i32 1, align 4

Linkage for dllexported globals and functions is now equal to their linkage
without dllexport. Imported globals and functions must be either
declarations with external linkage, or definitions with
AvailableExternallyLinkage.

llvm-svn: 199218

1 files changed, 94 insertions, 6 deletions

diff --git a/llvm/test/CodeGen/X86/dllexport.ll b/llvm/test/CodeGen/X86/dllexport.ll
index bf57e78f35d..1d992125976 100644
--- a/llvm/test/CodeGen/X86/dllexport.ll
+++ b/llvm/test/CodeGen/X86/dllexport.ll
@@ -1,12 +1,100 @@
-; RUN: llc < %s | FileCheck %s
-; PR2936
+; RUN: llc -mtriple i386-pc-win32 < %s | FileCheck -check-prefix=CHECK -check-prefix=WIN32 %s
+; RUN: llc -mtriple i386-pc-mingw32 < %s | FileCheck -check-prefix=CHECK -check-prefix=MINGW %s
 
-target triple = "i386-pc-mingw32"
+; CHECK: .text
 
-define dllexport x86_fastcallcc i32 @foo() nounwind  {
-entry:
+define void @notExported() {
+	ret void
+}
+
+; CHECK: .globl _f1
+define dllexport void @f1() {
+	ret void
+}
+
+; CHECK: .globl _f2
+define dllexport void @f2() unnamed_addr {
+	ret void
+}
+
+; CHECK: .globl _stdfun@0
+define dllexport x86_stdcallcc void @stdfun() nounwind {
+	ret void
+}
+
+; CHECK: .globl @fastfun@0
+define dllexport x86_fastcallcc i32 @fastfun() nounwind {
 	ret i32 0
 }
 
+; CHECK: .globl _thisfun
+define dllexport x86_thiscallcc void @thisfun() nounwind {
+	ret void
+}
+
+; CHECK: .section .text,"xr",discard,_lnk1
+; CHECK: .globl _lnk1
+define linkonce_odr dllexport void @lnk1() {
+	ret void
+}
+
+; CHECK: .section .text,"xr",discard,_lnk2
+; CHECK: .globl _lnk2
+define linkonce_odr dllexport void @lnk2() alwaysinline {
+	ret void
+}
+
+; CHECK: .section .text,"xr",discard,_weak1
+; CHECK: .globl _weak1
+define weak_odr dllexport void @weak1() {
+	ret void
+}
+
+
+; CHECK: .data
+; CHECK: .globl _Var1
+@Var1 = dllexport global i32 1, align 4
+
+; CHECK: .rdata,"r"
+; CHECK: .globl _Var2
+@Var2 = dllexport unnamed_addr constant i32 1
+
+; CHECK: .comm _Var3
+@Var3 = common dllexport global i32 0, align 4
+
+; CHECK: .section .data,"w",discard,_WeakVar1
+; CHECK: .globl _WeakVar1
+@WeakVar1 = weak_odr dllexport global i32 1, align 4
+
+; CHECK: .section .rdata,"r",discard,_WeakVar2
+; CHECK: .globl _WeakVar2
+@WeakVar2 = weak_odr dllexport unnamed_addr constant i32 1
+
+
 ; CHECK: .section .drectve
-; CHECK: -export:@foo@0
+; WIN32: /EXPORT:_Var1,DATA
+; WIN32: /EXPORT:_Var2,DATA
+; WIN32: /EXPORT:_Var3,DATA
+; WIN32: /EXPORT:_WeakVar1,DATA
+; WIN32: /EXPORT:_WeakVar2,DATA
+; WIN32: /EXPORT:_f1
+; WIN32: /EXPORT:_f2
+; WIN32: /EXPORT:_stdfun@0
+; WIN32: /EXPORT:@fastfun@0
+; WIN32: /EXPORT:_thisfun
+; WIN32: /EXPORT:_lnk1
+; WIN32: /EXPORT:_lnk2
+; WIN32: /EXPORT:_weak1
+; MINGW: -export:_Var1,data
+; MINGW: -export:_Var2,data
+; MINGW: -export:_Var3,data
+; MINGW: -export:_WeakVar1,data
+; MINGW: -export:_WeakVar2,data
+; MINGW: -export:_f1
+; MINGW: -export:_f2
+; MINGW: -export:_stdfun@0
+; MINGW: -export:@fastfun@0
+; MINGW: -export:_thisfun
+; MINGW: -export:_lnk1
+; MINGW: -export:_lnk2
+; MINGW: -export:_weak1