diff --git a/src/backends/metal/metal_codegen_ast.cpp b/src/backends/metal/metal_codegen_ast.cpp
index 0998a7620..1757a1357 100644
--- a/src/backends/metal/metal_codegen_ast.cpp
+++ b/src/backends/metal/metal_codegen_ast.cpp
@@ -231,7 +231,7 @@ void MetalCodegenAST::_emit_type_decls(Function kernel) noexcept {
     // process types in topological order
     types.clear();
     auto emit = [&](auto &&self, auto type) noexcept -> void {
-        if (types.emplace(type).second) {
+        if (type != nullptr && types.emplace(type).second) {
             if (type->is_array() || type->is_buffer()) {
                 self(self, type->element());
             } else if (type->is_structure()) {
@@ -960,7 +960,12 @@ void MetalCodegenAST::visit(const CallExpr *expr) noexcept {
         case CallOp::BUFFER_READ: _scratch << "buffer_read"; break;
         case CallOp::BUFFER_WRITE: _scratch << "buffer_write"; break;
         case CallOp::BUFFER_SIZE: _scratch << "buffer_size"; break;
-        case CallOp::BYTE_BUFFER_READ: _scratch << "byte_buffer_read"; break;
+        case CallOp::BYTE_BUFFER_READ: {
+            _scratch << "byte_buffer_read<";
+            _emit_type_name(expr->type());
+            _scratch << ">";
+            break;
+        }
         case CallOp::BYTE_BUFFER_WRITE: _scratch << "byte_buffer_write"; break;
         case CallOp::BYTE_BUFFER_SIZE: _scratch << "byte_buffer_size"; break;
         case CallOp::TEXTURE_READ: _scratch << "texture_read"; break;
@@ -1137,6 +1142,15 @@ void MetalCodegenAST::visit(const CallExpr *expr) noexcept {
         case CallOp::TEXTURE3D_SAMPLE_LEVEL: LUISA_NOT_IMPLEMENTED();
         case CallOp::TEXTURE3D_SAMPLE_GRAD: LUISA_NOT_IMPLEMENTED();
         case CallOp::TEXTURE3D_SAMPLE_GRAD_LEVEL: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE2D_SAMPLE_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE2D_SAMPLE_LEVEL_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE2D_SAMPLE_GRAD_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE2D_SAMPLE_GRAD_LEVEL_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE3D_SAMPLE_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE3D_SAMPLE_LEVEL_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE3D_SAMPLE_GRAD_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::BINDLESS_TEXTURE3D_SAMPLE_GRAD_LEVEL_SAMPLER: LUISA_NOT_IMPLEMENTED();
+        case CallOp::CLOCK: LUISA_NOT_IMPLEMENTED();
     }
     _scratch << "(";
     if (auto op = expr->op(); is_atomic_operation(op)) {