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Add support for weakly imported classes (GNU runtime). 

llvm-svn: 134140
This commit is contained in:
David Chisnall 2011-06-30 10:14:37 +00:00
parent 2caedf449e
commit 08d6733ed7
1 changed files with 8 additions and 5 deletions
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13
clang/lib/CodeGen/CGObjCGNU.cpp
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@ -393,7 +393,8 @@ private:
/// is no class of the matching name.
void EmitClassRef(const std::string &className);
/// Emits a pointer to the named class
llvm::Value *GetClassNamed(CGBuilderTy &Builder, const std::string &Name);
llvm::Value *GetClassNamed(CGBuilderTy &Builder, const std::string &Name,
bool isWeak);
protected:
/// Looks up the method for sending a message to the specified object. This
/// mechanism differs between the GCC and GNU runtimes, so this method must be
@ -776,7 +777,8 @@ CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
}
llvm::Value *CGObjCGNU::GetClassNamed(CGBuilderTy &Builder,
const std::string &Name) {
const std::string &Name,
bool isWeak) {
llvm::Value *ClassName = CGM.GetAddrOfConstantCString(Name);
// With the incompatible ABI, this will need to be replaced with a direct
// reference to the class symbol. For the compatible nonfragile ABI we are
@ -785,7 +787,8 @@ llvm::Value *CGObjCGNU::GetClassNamed(CGBuilderTy &Builder,
//
// Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class
// with memoized versions or with static references if it's safe to do so.
EmitClassRef(Name);
if (!isWeak)
EmitClassRef(Name);
ClassName = Builder.CreateStructGEP(ClassName, 0);
llvm::Constant *ClassLookupFn =
@ -798,10 +801,10 @@ llvm::Value *CGObjCGNU::GetClassNamed(CGBuilderTy &Builder,
// techniques can modify the name -> class mapping.
llvm::Value *CGObjCGNU::GetClass(CGBuilderTy &Builder,
const ObjCInterfaceDecl *OID) {
return GetClassNamed(Builder, OID->getNameAsString());
return GetClassNamed(Builder, OID->getNameAsString(), OID->isWeakImported());
}
llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CGBuilderTy &Builder) {
return GetClassNamed(Builder, "NSAutoreleasePool");
return GetClassNamed(Builder, "NSAutoreleasePool", false);
}
llvm::Value *CGObjCGNU::GetSelector(CGBuilderTy &Builder, Selector Sel,