Make IRGlobal a Thing

Sources/LLVM/Alias.swift

@@ -2,7 +2,7 @@ import cllvm
 
 /// An `Alias` represents a global alias in an LLVM module - a new symbol and 
 /// corresponding metadata for an existing position
-public struct Alias: IRValue {
+public struct Alias: IRGlobal {
   internal let llvm: LLVMValueRef
 
   /// Retrieves the underlying LLVM value object.

Sources/LLVM/Function.swift

@@ -3,7 +3,7 @@ import cllvm
 /// A `Function` represents a named function body in LLVM IR source.  Functions
 /// in LLVM IR encapsulate a list of parameters and a sequence of basic blocks 
 /// and provide a way to append to that sequence to build out its body.
-public class Function: IRValue {
+public class Function: IRGlobal {
   internal let llvm: LLVMValueRef
   internal init(llvm: LLVMValueRef) {
     self.llvm = llvm
@@ -107,18 +107,6 @@ public class Function: IRValue {
     LLVMDeleteFunction(llvm)
   }
 
-  /// Retrieves the linkage information for this function.
-  public var linkage: Linkage {
-    get { return Linkage(llvm: LLVMGetLinkage(asLLVM())) }
-    set { LLVMSetLinkage(asLLVM(), newValue.llvm) }
-  }
-
-  /// Retrieves the visibility style for this function.
-  public var visibility: Visibility {
-    get { return Visibility(llvm: LLVMGetVisibility(asLLVM())) }
-    set { LLVMSetVisibility(asLLVM(), newValue.llvm) }
-  }
-
   /// Retrieves the underlying LLVM value object.
   public func asLLVM() -> LLVMValueRef {
     return llvm

Sources/LLVM/Global.swift

@@ -3,7 +3,7 @@ import cllvm
 /// A `Global` represents a region of memory allocated at compile time instead
 /// of at runtime.  A global variable must either have an initializer, or make
 /// reference to an external definition that has an initializer.
-public struct Global: IRValue {
+public struct Global: IRGlobal {
   internal let llvm: LLVMValueRef
 
   /// Returns whether this global variable has no initializer because it makes
@@ -33,18 +33,6 @@ public struct Global: IRValue {
     set { LLVMSetThreadLocal(asLLVM(), newValue.llvm) }
   }
 
-  /// Retrieves the linkage information for this global value.
-  public var linkage: Linkage {
-    get { return Linkage(llvm: LLVMGetLinkage(asLLVM())) }
-    set { LLVMSetLinkage(asLLVM(), newValue.llvm) }
-  }
-
-  /// Retrieves the visibility style for this global value.
-  public var visibility: Visibility {
-    get { return Visibility(llvm: LLVMGetVisibility(asLLVM())) }
-    set { LLVMSetVisibility(asLLVM(), newValue.llvm) }
-  }
-
   /// Deletes the global variable from its containing module.
   /// - note: This does not remove references to this global from the
   ///         module. Ensure you have removed all insructions that reference

Sources/LLVM/IRBuilder.swift

@@ -1346,7 +1346,7 @@ public class IRBuilder {
   /// - parameter type: The type of the aliased value or expression.
   ///
   /// - returns: A value representing the newly created alias.
-  public func addAlias(name: String, to aliasee: IRValue, type: IRType) -> Alias {
+  public func addAlias(name: String, to aliasee: IRGlobal, type: IRType) -> Alias {
     return Alias(llvm: LLVMAddAlias(module.llvm, type.asLLVM(), aliasee.asLLVM(), name))
   }
 

Sources/LLVM/IRGlobal.swift

@@ -0,0 +1,19 @@
+import cllvm
+
+/// An `IRGlobal` is a value, alias, or function that exists at the top level of
+/// an LLVM module.
+public protocol IRGlobal: IRValue {}
+
+extension IRGlobal {
+  /// Retrieves the linkage information for this global.
+  public var linkage: Linkage {
+    get { return Linkage(llvm: LLVMGetLinkage(asLLVM())) }
+    set { LLVMSetLinkage(asLLVM(), newValue.llvm) }
+  }
+
+  /// Retrieves the visibility style for this global.
+  public var visibility: Visibility {
+    get { return Visibility(llvm: LLVMGetVisibility(asLLVM())) }
+    set { LLVMSetVisibility(asLLVM(), newValue.llvm) }
+  }
+}