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Decouple dllexport/dllimport from linkage

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199218 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nico Rieck
2014-01-14 15:22:47 +00:00
parent d05a6582da
commit 38f68c5a2e
27 changed files with 547 additions and 157 deletions
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10
lib/IR/Core.cpp
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@ -1164,10 +1164,6 @@ LLVMLinkage LLVMGetLinkage(LLVMValueRef Global) {
return LLVMLinkerPrivateLinkage;
case GlobalValue::LinkerPrivateWeakLinkage:
return LLVMLinkerPrivateWeakLinkage;
case GlobalValue::DLLImportLinkage:
return LLVMDLLImportLinkage;
case GlobalValue::DLLExportLinkage:
return LLVMDLLExportLinkage;
case GlobalValue::ExternalWeakLinkage:
return LLVMExternalWeakLinkage;
case GlobalValue::CommonLinkage:
@ -1219,10 +1215,12 @@ void LLVMSetLinkage(LLVMValueRef Global, LLVMLinkage Linkage) {
GV->setLinkage(GlobalValue::LinkerPrivateWeakLinkage);
break;
case LLVMDLLImportLinkage:
GV->setLinkage(GlobalValue::DLLImportLinkage);
DEBUG(errs()
<< "LLVMSetLinkage(): LLVMDLLImportLinkage is no longer supported.");
break;
case LLVMDLLExportLinkage:
GV->setLinkage(GlobalValue::DLLExportLinkage);
DEBUG(errs()
<< "LLVMSetLinkage(): LLVMDLLExportLinkage is no longer supported.");
break;
case LLVMExternalWeakLinkage:
GV->setLinkage(GlobalValue::ExternalWeakLinkage);