[ensure no more DConstValues for function ptrs and delegates]

Author: kinke

gen/dvalue.cpp

@@ -80,6 +80,7 @@ DImValue::DImValue(Type *t, llvm::Value *v) : DRValue(t, v) {
 
 DConstValue::DConstValue(Type *t, LLConstant *con) : DRValue(t, con) {
   assert(con->getType() == DtoType(t));
+  assert(!t->toBasetype()->isFunction_Delegate_PtrToFunction());
 }
 
 ////////////////////////////////////////////////////////////////////////////////

gen/llvmhelpers.cpp

@@ -467,11 +467,17 @@ DValue *DtoNullValue(Type *type, Loc loc) {
                                LLConstant::getNullValue(basefp));
     return new DImValue(type, res);
   }
-  // integer, floating, pointer, assoc array, delegate and class have no special
+  // function pointers and delegates
+  if (basetype->isFunction_Delegate_PtrToFunction()) {
+    return new DFuncValue(
+        type, nullptr, getNullPtr(gDataLayout->getProgramAddressSpace()),
+        basety == TY::Tdelegate ? getNullPtr() : nullptr);
+  }
+  // integer, floating, pointer, assoc array, and class have no special
   // representation
   if (basetype->isintegral() || basetype->isfloating() ||
       basety == TY::Tpointer || basety == TY::Tnull || basety == TY::Tclass ||
-      basety == TY::Tdelegate || basety == TY::Taarray) {
+      basety == TY::Taarray) {
     return new DNullValue(type, LLConstant::getNullValue(lltype));
   }
   // dynamic array

gen/toir.cpp

@@ -381,8 +381,7 @@ class ToElemVisitor : public Visitor {
     IF_LOG Logger::print("NullExp::toElem(type=%s): %s\n", e->type->toChars(),
                          e->toChars());
     LOG_SCOPE;
-    LLConstant *c = toConstElem(e, p);
-    result = new DNullValue(e->type, c);
+    result = DtoNullValue(e->type, e->loc);
   }
 
   //////////////////////////////////////////////////////////////////////////////

gen/tollvm.cpp

@@ -697,8 +697,8 @@ LLPointerType *getOpaquePtrType(unsigned addressSpace) {
   return LLPointerType::get(gIR->context(), addressSpace);
 }
 
-llvm::ConstantPointerNull *getNullPtr() {
-  return llvm::ConstantPointerNull::get(getOpaquePtrType());
+llvm::ConstantPointerNull *getNullPtr(unsigned addressSpace) {
+  return llvm::ConstantPointerNull::get(getOpaquePtrType(addressSpace));
 }
 
 LLConstant *getNullValue(LLType *t) { return LLConstant::getNullValue(t); }

gen/tollvm.h

@@ -149,7 +149,7 @@ LLGlobalVariable *isaGlobalVar(LLValue *v);
 // llvm::T::get(...) wrappers
 LLType *getI8Type();
 LLPointerType *getOpaquePtrType(unsigned addressSpace = 0);
-llvm::ConstantPointerNull *getNullPtr();
+llvm::ConstantPointerNull *getNullPtr(unsigned addressSpace = 0);
 LLConstant *getNullValue(LLType *t);
 
 // type sizes