Start attempting to generate code for C++ ctors.

llvm-svn: 69168

clang/lib/CodeGen/CGCXX.cpp

@@ -114,7 +114,6 @@ RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE) {
                   Callee, Args, MD);
 }
 
-
 llvm::Value *CodeGenFunction::LoadCXXThis() {
   assert(isa<CXXMethodDecl>(CurFuncDecl) && 
          "Must be in a C++ member function decl to load 'this'");
@@ -124,3 +123,35 @@ llvm::Value *CodeGenFunction::LoadCXXThis() {
   // FIXME: What if we're inside a block?
   return Builder.CreateLoad(LocalDeclMap[CXXThisDecl], "this");
 }
+
+const char *CodeGenModule::getMangledCXXCtorName(const CXXConstructorDecl *D, 
+                                                 CXXCtorType Type) {
+  llvm::SmallString<256> Name;
+  llvm::raw_svector_ostream Out(Name);
+  mangleCXXCtor(D, Type, Context, Out);
+
+  Name += '\0';
+  return UniqueMangledName(Name.begin(), Name.end());
+}
+
+void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D, 
+                                       CXXCtorType Type) {
+  const llvm::FunctionType *Ty =
+    getTypes().GetFunctionType(getTypes().getFunctionInfo(D), false);
+  
+  const char *Name = getMangledCXXCtorName(D, Type);
+  llvm::Function *Fn = 
+    cast<llvm::Function>(GetOrCreateLLVMFunction(Name, Ty, D));
+ 
+  CodeGenFunction(*this).GenerateCode(D, Fn);
+  
+  SetFunctionDefinitionAttributes(D, Fn);
+  SetLLVMFunctionAttributesForDefinition(D, Fn);
+}
+
+void CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) {
+  ErrorUnsupported(D, "C++ constructor", true);
+
+  EmitCXXConstructor(D, Ctor_Complete);
+  EmitCXXConstructor(D, Ctor_Base);
+}

clang/lib/CodeGen/CodeGenModule.cpp

@@ -156,7 +156,14 @@ const char *CodeGenModule::getMangledName(const NamedDecl *ND) {
   }
 
   Name += '\0';
-  return MangledNames.GetOrCreateValue(Name.begin(), Name.end()).getKeyData();
+  return UniqueMangledName(Name.begin(), Name.end());
+}
+
+const char *CodeGenModule::UniqueMangledName(const char *NameStart,
+                                             const char *NameEnd) {
+  assert(*(NameEnd - 1) == '\0' && "Mangled name must be null terminated!");
+  
+  return MangledNames.GetOrCreateValue(NameStart, NameEnd).getKeyData();
 }
 
 /// AddGlobalCtor - Add a function to the list that will be called before
@@ -1344,11 +1351,15 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
     EmitGlobal(cast<ValueDecl>(D));
     break;
 
+  // C++ Decls
   case Decl::Namespace:
     EmitNamespace(cast<NamespaceDecl>(D));
     break;
-
-    // Objective-C Decls
+  case Decl::CXXConstructor:
+    EmitCXXConstructors(cast<CXXConstructorDecl>(D));
+    break;
+        
+  // Objective-C Decls
     
   // Forward declarations, no (immediate) code generation.
   case Decl::ObjCClass:

clang/lib/CodeGen/CodeGenModule.h

@@ -18,6 +18,7 @@
 #include "clang/AST/Attr.h"
 #include "CGBlocks.h"
 #include "CGCall.h"
+#include "CGCXX.h"
 #include "CodeGenTypes.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/StringMap.h"
@@ -311,7 +312,9 @@ public:
                               AttributeListType &PAL);
 
   const char *getMangledName(const NamedDecl *ND);
-
+  const char *getMangledCXXCtorName(const CXXConstructorDecl *D, 
+                                    CXXCtorType Type);
+  
   enum GVALinkage {
     GVA_Internal,
     GVA_C99Inline,
@@ -320,6 +323,10 @@ public:
   };
   
 private:
+  /// UniqueMangledName - Unique a name by (if necessary) inserting it into the
+  /// MangledNames string map.
+  const char *UniqueMangledName(const char *NameStart, const char *NameEnd);
+  
   llvm::Constant *GetOrCreateLLVMFunction(const char *MangledName,
                                           const llvm::Type *Ty,
                                           const FunctionDecl *D);
@@ -353,8 +360,19 @@ private:
   void EmitGlobalVarDefinition(const VarDecl *D);
   void EmitAliasDefinition(const ValueDecl *D);
   void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
+
+  // C++ related functions.
+  
   void EmitNamespace(const NamespaceDecl *D);
   void EmitLinkageSpec(const LinkageSpecDecl *D);
+
+  /// EmitCXXConstructors - Emit constructors (base, complete) from a
+  /// C++ constructor Decl.
+  void EmitCXXConstructors(const CXXConstructorDecl *D);
+  
+  /// EmitCXXConstructor - Emit a single constructor with the given type from
+  /// a C++ constructor Decl.
+  void EmitCXXConstructor(const CXXConstructorDecl *D, CXXCtorType Type);
   
   // FIXME: Hardcoding priority here is gross.
   void AddGlobalCtor(llvm::Function * Ctor, int Priority=65535);