compiler, reflect: add map key and element type info

compiler/interface.go

@@ -131,6 +131,8 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 		case *types.Map:
 			typeFieldTypes = append(typeFieldTypes,
 				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
+				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
+				types.NewVar(token.NoPos, nil, "keyType", types.Typ[types.UnsafePointer]),
 			)
 		case *types.Struct:
 			typeFieldTypes = append(typeFieldTypes,
@@ -193,6 +195,8 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 		case *types.Map:
 			typeFields = []llvm.Value{
 				c.getTypeCode(types.NewPointer(typ)), // ptrTo
+				c.getTypeCode(typ.Elem()),            // elem
+				c.getTypeCode(typ.Key()),             // key
 			}
 		case *types.Struct:
 			typeFields = []llvm.Value{

src/reflect/type.go

@@ -33,6 +33,8 @@
 // - map types (this is still missing the key and element types)
 //     meta         uint8
 //     ptrTo        *typeStruct
+//     elem         *typeStruct
+//     key          *typeStruct
 // - struct types (see structType):
 //     meta         uint8
 //     numField     uint16
@@ -408,6 +410,13 @@ type arrayType struct {
 	arrayLen uintptr
 }
 
+type mapType struct {
+	rawType
+	ptrTo *rawType
+	elem  *rawType
+	key   *rawType
+}
+
 // Type for struct types. The numField value is intentionally put before ptrTo
 // for better struct packing on 32-bit and 64-bit architectures. On these
 // architectures, the ptrTo field still has the same offset as in all the other