From 1491ef7dc4ea536d8f262566becdd5d1e6abb05e Mon Sep 17 00:00:00 2001
From: Nico Rieck <nico.rieck@gmail.com>
Date: Tue, 14 Jan 2014 15:23:25 +0000
Subject: [PATCH] Handle dllexport for global aliases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199219 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86AsmPrinter.cpp     | 15 +++++++++++++++
 test/CodeGen/X86/dllexport-x86_64.ll | 25 +++++++++++++++++++++++++
 test/CodeGen/X86/dllexport.ll        | 25 +++++++++++++++++++++++++
 3 files changed, 65 insertions(+)

diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp
index ad7d3e0fdca..e6ad2f1d0da 100644
--- a/lib/Target/X86/X86AsmPrinter.cpp
+++ b/lib/Target/X86/X86AsmPrinter.cpp
@@ -658,6 +658,21 @@ void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
       if (I->hasDLLExportStorageClass())
         DLLExportedGlobals.push_back(getSymbol(I));
 
+    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
+                                      I != E; ++I) {
+      const GlobalValue *GV = I;
+      if (!GV->hasDLLExportStorageClass())
+        continue;
+
+      while (const GlobalAlias *A = dyn_cast<GlobalAlias>(GV))
+        GV = A->getAliasedGlobal();
+
+      if (isa<Function>(GV))
+        DLLExportedFns.push_back(getSymbol(I));
+      else if (isa<GlobalVariable>(GV))
+        DLLExportedGlobals.push_back(getSymbol(I));
+    }
+
     // Output linker support code for dllexported globals on windows.
     if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
       const TargetLoweringObjectFileCOFF &TLOFCOFF =
diff --git a/test/CodeGen/X86/dllexport-x86_64.ll b/test/CodeGen/X86/dllexport-x86_64.ll
index 6bf73aa5366..1fadfec2543 100644
--- a/test/CodeGen/X86/dllexport-x86_64.ll
+++ b/test/CodeGen/X86/dllexport-x86_64.ll
@@ -56,6 +56,23 @@ define weak_odr dllexport void @weak1() {
 @WeakVar2 = weak_odr dllexport unnamed_addr constant i32 1
 
 
+; CHECK: .globl alias
+; CHECK: alias = notExported
+@alias = dllexport alias void()* @notExported
+
+; CHECK: .globl alias2
+; CHECK: alias2 = f1
+@alias2 = dllexport alias void()* @f1
+
+; CHECK: .globl alias3
+; CHECK: alias3 = alias
+@alias3 = dllexport alias void()* @alias
+
+; CHECK: .weak weak_alias
+; CHECK: weak_alias = f1
+@weak_alias = dllexport alias weak_odr void()* @f1
+
+
 ; CHECK: .section .drectve
 ; WIN32: /EXPORT:Var1,DATA
 ; WIN32: /EXPORT:Var2,DATA
@@ -67,6 +84,10 @@ define weak_odr dllexport void @weak1() {
 ; WIN32: /EXPORT:lnk1
 ; WIN32: /EXPORT:lnk2
 ; WIN32: /EXPORT:weak1
+; WIN32: /EXPORT:alias
+; WIN32: /EXPORT:alias2
+; WIN32: /EXPORT:alias3
+; WIN32: /EXPORT:weak_alias
 ; MINGW: -export:Var1,data
 ; MINGW: -export:Var2,data
 ; MINGW: -export:Var3,data
@@ -77,3 +98,7 @@ define weak_odr dllexport void @weak1() {
 ; MINGW: -export:lnk1
 ; MINGW: -export:lnk2
 ; MINGW: -export:weak1
+; MINGW: -export:alias
+; MINGW: -export:alias2
+; MINGW: -export:alias3
+; MINGW: -export:weak_alias
diff --git a/test/CodeGen/X86/dllexport.ll b/test/CodeGen/X86/dllexport.ll
index 1d992125976..7f0dadb6a2e 100644
--- a/test/CodeGen/X86/dllexport.ll
+++ b/test/CodeGen/X86/dllexport.ll
@@ -71,6 +71,23 @@ define weak_odr dllexport void @weak1() {
 @WeakVar2 = weak_odr dllexport unnamed_addr constant i32 1
 
 
+; CHECK: .globl _alias
+; CHECK: _alias = _notExported
+@alias = dllexport alias void()* @notExported
+
+; CHECK: .globl _alias2
+; CHECK: _alias2 = _f1
+@alias2 = dllexport alias void()* @f1
+
+; CHECK: .globl _alias3
+; CHECK: _alias3 = _alias
+@alias3 = dllexport alias void()* @alias
+
+; CHECK: .weak _weak_alias
+; CHECK: _weak_alias = _f1
+@weak_alias = dllexport alias weak_odr void()* @f1
+
+
 ; CHECK: .section .drectve
 ; WIN32: /EXPORT:_Var1,DATA
 ; WIN32: /EXPORT:_Var2,DATA
@@ -85,6 +102,10 @@ define weak_odr dllexport void @weak1() {
 ; WIN32: /EXPORT:_lnk1
 ; WIN32: /EXPORT:_lnk2
 ; WIN32: /EXPORT:_weak1
+; WIN32: /EXPORT:_alias
+; WIN32: /EXPORT:_alias2
+; WIN32: /EXPORT:_alias3
+; WIN32: /EXPORT:_weak_alias
 ; MINGW: -export:_Var1,data
 ; MINGW: -export:_Var2,data
 ; MINGW: -export:_Var3,data
@@ -98,3 +119,7 @@ define weak_odr dllexport void @weak1() {
 ; MINGW: -export:_lnk1
 ; MINGW: -export:_lnk2
 ; MINGW: -export:_weak1
+; MINGW: -export:_alias
+; MINGW: -export:_alias2
+; MINGW: -export:_alias3
+; MINGW: -export:_weak_alias
-- 
2.34.1