implement support for basic codegen of global variables with no initializers.
llvm-svn: 39795
diff --git a/clang/CodeGen/CodeGenModule.cpp b/clang/CodeGen/CodeGenModule.cpp
index cdc3e63..b610d3e 100644
--- a/clang/CodeGen/CodeGenModule.cpp
+++ b/clang/CodeGen/CodeGenModule.cpp
@@ -48,12 +48,45 @@
0, D->getName(), &getModule());
}
-void CodeGenModule::EmitFunction(FunctionDecl *FD) {
+void CodeGenModule::EmitFunction(const FunctionDecl *FD) {
// If this is not a prototype, emit the body.
if (FD->getBody())
CodeGenFunction(*this).GenerateCode(FD);
}
+void CodeGenModule::EmitGlobalVar(const FileVarDecl *D) {
+ llvm::GlobalVariable *GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalDecl(D));
+
+ // If the storage class is external and there is no initializer, just leave it
+ // as a declaration.
+ if (D->getStorageClass() == VarDecl::Extern && D->getInit() == 0)
+ return;
+
+ // Otherwise, convert the initializer, or use zero if appropriate.
+ llvm::Constant *Init;
+ if (D->getInit() == 0)
+ Init = llvm::Constant::getNullValue(GV->getType()->getElementType());
+ else
+ assert(D->getInit() == 0 && "FIXME: Global variable initializers unimp!");
+
+ GV->setInitializer(Init);
+
+ // Set the llvm linkage type as appropriate.
+ // FIXME: This isn't right. This should handle common linkage and other
+ // stuff.
+ switch (D->getStorageClass()) {
+ case VarDecl::Auto:
+ case VarDecl::Register:
+ assert(0 && "Can't have auto or register globals");
+ case VarDecl::None:
+ case VarDecl::Extern:
+ // todo: common
+ break;
+ case VarDecl::Static:
+ GV->setLinkage(llvm::GlobalVariable::InternalLinkage);
+ break;
+ }
+}
llvm::Function *CodeGenModule::getMemCpyFn() {