Initialize function pointers to a panicking function if it couldn't be

loaded

ash/src/entry.rs

@@ -37,8 +37,6 @@ pub struct Entry<V: FunctionPointers> {
 #[derive(Debug)]
 pub enum LoadingError {
     LibraryLoadError(String),
-    EntryLoadError(Vec<&'static str>),
-    StaticLoadError(Vec<&'static str>),
 }
 
 #[derive(Debug)]
@@ -87,8 +85,7 @@ pub trait EntryV1_0 {
             return Err(InstanceError::VkError(err_code));
         }
         let instance_fp =
-            <Self::Fp as FunctionPointers>::InstanceFp::load(&self.static_fn(), instance)
+            <Self::Fp as FunctionPointers>::InstanceFp::load(&self.static_fn(), instance);
-                .map_err(InstanceError::LoadError)?;
         Ok(Instance::from_raw(instance, instance_fp))
     }
 
@@ -176,10 +173,10 @@ impl<V: FunctionPointers> Entry<V> {
         let static_fn = vk::StaticFn::load(|name| unsafe {
             lib.symbol(&*name.to_string_lossy())
                 .unwrap_or(ptr::null_mut())
-        }).map_err(LoadingError::StaticLoadError)?;
+        });
 
         let entry_fn =
-            unsafe { V::EntryFp::load(&static_fn) }.map_err(LoadingError::EntryLoadError)?;
+            unsafe { V::EntryFp::load(&static_fn) };
 
         Ok(Entry {
             static_fn,

ash/src/extensions/android_surface.rs

@@ -16,14 +16,14 @@ impl AndroidSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<AndroidSurface, Vec<&'static str>> {
+    ) -> AndroidSurface {
         let surface_fn = vk::KhrAndroidSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(AndroidSurface {
+        AndroidSurface {
             handle: instance.handle(),
             android_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/debug_marker.rs

@@ -14,13 +14,13 @@ impl DebugMarker {
     pub fn new<I: InstanceV1_0, D: DeviceV1_0>(
         instance: &I,
         device: &D,
-    ) -> Result<DebugMarker, Vec<&'static str>> {
+    ) -> DebugMarker {
         let debug_marker_fn = vk::ExtDebugMarkerFn::load(|name| unsafe {
             mem::transmute(instance.get_device_proc_addr(device.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(DebugMarker {
+        DebugMarker {
             debug_marker_fn: debug_marker_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/debug_report.rs

@@ -16,14 +16,14 @@ impl DebugReport {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<DebugReport, Vec<&'static str>> {
+    ) -> DebugReport {
         let debug_report_fn = vk::ExtDebugReportFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(DebugReport {
+        DebugReport {
             handle: instance.handle(),
             debug_report_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/debug_utils.rs

@@ -15,14 +15,14 @@ impl DebugUtils {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<DebugUtils, Vec<&'static str>> {
+    ) -> DebugUtils {
         let debug_utils_fn = vk::ExtDebugUtilsFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(DebugUtils {
+        DebugUtils {
             handle: instance.handle(),
             debug_utils_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/display_swapchain.rs

@@ -16,14 +16,14 @@ impl DisplaySwapchain {
     pub fn new<I: InstanceV1_0, D: DeviceV1_0>(
         instance: &I,
         device: &D,
-    ) -> Result<DisplaySwapchain, Vec<&'static str>> {
+    ) -> DisplaySwapchain {
         let swapchain_fn = vk::KhrDisplaySwapchainFn::load(|name| unsafe {
             mem::transmute(instance.get_device_proc_addr(device.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(DisplaySwapchain {
+        DisplaySwapchain {
             handle: device.handle(),
             swapchain_fn: swapchain_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/ios_surface.rs

@@ -16,14 +16,14 @@ impl IOSSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<IOSSurface, Vec<&'static str>> {
+    ) -> IOSSurface{
         let surface_fn = vk::MvkIosSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(IOSSurface {
+        IOSSurface {
             handle: instance.handle(),
             ios_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/macos_surface.rs

@@ -16,14 +16,14 @@ impl MacOSSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<MacOSSurface, Vec<&'static str>> {
+    ) -> MacOSSurface {
         let surface_fn = vk::MvkMacosSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(MacOSSurface {
+        MacOSSurface {
             handle: instance.handle(),
             macos_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/surface.rs

@@ -17,14 +17,14 @@ impl Surface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<Surface, Vec<&'static str>> {
+    ) -> Surface {
         let surface_fn = vk::KhrSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(Surface {
+        Surface {
             handle: instance.handle(),
             surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/swapchain.rs

@@ -17,14 +17,14 @@ impl Swapchain {
     pub fn new<I: InstanceV1_0, D: DeviceV1_0>(
         instance: &I,
         device: &D,
-    ) -> Result<Swapchain, Vec<&'static str>> {
+    ) -> Swapchain {
         let swapchain_fn = vk::KhrSwapchainFn::load(|name| unsafe {
             mem::transmute(instance.get_device_proc_addr(device.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(Swapchain {
+        Swapchain {
             handle: device.handle(),
             swapchain_fn: swapchain_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/wayland_surface.rs

@@ -16,14 +16,14 @@ impl WaylandSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<WaylandSurface, Vec<&'static str>> {
+    ) -> WaylandSurface {
         let surface_fn = vk::KhrWaylandSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(WaylandSurface {
+        WaylandSurface {
             handle: instance.handle(),
             wayland_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/win32_surface.rs

@@ -16,14 +16,14 @@ impl Win32Surface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<Win32Surface, Vec<&'static str>> {
+    ) -> Win32Surface {
         let surface_fn = vk::KhrWin32SurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(Win32Surface {
+        Win32Surface {
             handle: instance.handle(),
             win32_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/xcb_surface.rs

@@ -16,14 +16,14 @@ impl XcbSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<XcbSurface, Vec<&'static str>> {
+    ) -> XcbSurface {
         let surface_fn = vk::KhrXcbSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(XcbSurface {
+        XcbSurface {
             handle: instance.handle(),
             xcb_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/extensions/xlib_surface.rs

@@ -16,14 +16,14 @@ impl XlibSurface {
     pub fn new<E: EntryV1_0, I: InstanceV1_0>(
         entry: &E,
         instance: &I,
-    ) -> Result<XlibSurface, Vec<&'static str>> {
+    ) -> XlibSurface {
         let surface_fn = vk::KhrXlibSurfaceFn::load(|name| unsafe {
             mem::transmute(entry.get_instance_proc_addr(instance.handle(), name.as_ptr()))
-        })?;
+        });
-        Ok(XlibSurface {
+        XlibSurface {
             handle: instance.handle(),
             xlib_surface_fn: surface_fn,
-        })
+        }
     }
 
     pub fn name() -> &'static CStr {

ash/src/instance.rs

@@ -279,7 +279,7 @@ pub trait InstanceV1_0 {
         let device_fn = <<Self as InstanceV1_0>::Fp as FunctionPointers>::DeviceFp::load(
             self.fp_v1_0(),
             device,
-        ).map_err(|err| DeviceError::LoadError(err))?;
+        );
         Ok(Device::from_raw(device, device_fn))
     }
 

ash/src/version.rs

@@ -37,17 +37,17 @@ impl EntryLoader for EntryFpV1_0 {
     fn fp_v1_0(&self) -> &vk::EntryFnV1_0 {
         &self.entry_fn
     }
-    unsafe fn load(static_fn: &vk::StaticFn) -> Result<Self, Vec<&'static str>> {
+    unsafe fn load(static_fn: &vk::StaticFn) -> Self {
         let entry_fn = vk::EntryFnV1_0::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(vk::Instance::null(), name.as_ptr()))
-        })?;
+        });
-        Ok(EntryFpV1_0 { entry_fn: entry_fn })
+        EntryFpV1_0 { entry_fn: entry_fn }
     }
 }
 
 pub trait EntryLoader: Sized {
     fn fp_v1_0(&self) -> &vk::EntryFnV1_0;
-    unsafe fn load(static_fn: &vk::StaticFn) -> Result<Self, Vec<&'static str>>;
+    unsafe fn load(static_fn: &vk::StaticFn) -> Self;
 }
 
 #[allow(non_camel_case_types)]
@@ -61,18 +61,18 @@ impl EntryLoader for EntryFpV1_1 {
     fn fp_v1_0(&self) -> &vk::EntryFnV1_0 {
         &self.entry_fn_1_0
     }
-    unsafe fn load(static_fn: &vk::StaticFn) -> Result<Self, Vec<&'static str>> {
+    unsafe fn load(static_fn: &vk::StaticFn) -> Self {
         let entry_fn_1_0 = vk::EntryFnV1_0::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(vk::Instance::null(), name.as_ptr()))
-        })?;
+        });
         let entry_fn_1_1 = vk::EntryFnV1_1::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(vk::Instance::null(), name.as_ptr()))
-        })?;
+        });
 
-        Ok(EntryFpV1_1 {
+        EntryFpV1_1 {
             entry_fn_1_0,
             entry_fn_1_1,
-        })
+        }
     }
 }
 
@@ -80,7 +80,7 @@ pub trait InstanceLoader: Sized {
     unsafe fn load(
         static_fn: &vk::StaticFn,
         instance: vk::Instance,
-    ) -> Result<Self, Vec<&'static str>>;
+    ) -> Self;
 }
 
 #[allow(non_camel_case_types)]
@@ -93,13 +93,13 @@ impl InstanceLoader for InstanceFpV1_0 {
     unsafe fn load(
         static_fn: &vk::StaticFn,
         instance: vk::Instance,
-    ) -> Result<Self, Vec<&'static str>> {
+    ) -> Self {
         let instance_fn = vk::InstanceFnV1_0::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(instance, name.as_ptr()))
-        })?;
+        });
-        Ok(InstanceFpV1_0 {
+        InstanceFpV1_0 {
             instance_fn: instance_fn,
-        })
+        }
     }
 }
 
@@ -114,18 +114,18 @@ impl InstanceLoader for InstanceFpV1_1 {
     unsafe fn load(
         static_fn: &vk::StaticFn,
         instance: vk::Instance,
-    ) -> Result<Self, Vec<&'static str>> {
+    ) -> Self {
         let instance_fn_1_0 = vk::InstanceFnV1_0::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(instance, name.as_ptr()))
-        })?;
+        });
         let instance_fn_1_1 = vk::InstanceFnV1_1::load(|name| {
             mem::transmute(static_fn.get_instance_proc_addr(instance, name.as_ptr()))
-        })?;
+        });
 
-        Ok(InstanceFpV1_1 {
+        InstanceFpV1_1 {
             instance_fn_1_0,
             instance_fn_1_1,
-        })
+        }
     }
 }
 
@@ -133,7 +133,7 @@ pub trait DeviceLoader: Sized {
     unsafe fn load(
         instance_fn: &vk::InstanceFnV1_0,
         device: vk::Device,
-    ) -> Result<Self, Vec<&'static str>>;
+    ) -> Self;
 }
 
 #[allow(non_camel_case_types)]
@@ -146,13 +146,13 @@ impl DeviceLoader for DeviceFpV1_0 {
     unsafe fn load(
         instance_fn: &vk::InstanceFnV1_0,
         device: vk::Device,
-    ) -> Result<Self, Vec<&'static str>> {
+    ) -> Self {
         let device_fn = vk::DeviceFnV1_0::load(|name| {
             mem::transmute(instance_fn.get_device_proc_addr(device, name.as_ptr()))
-        })?;
+        });
-        Ok(DeviceFpV1_0 {
+        DeviceFpV1_0 {
             device_fn: device_fn,
-        })
+        }
     }
 }
 
@@ -167,16 +167,16 @@ impl DeviceLoader for DeviceFpV1_1 {
     unsafe fn load(
         instance_fn: &vk::InstanceFnV1_0,
         device: vk::Device,
-    ) -> Result<Self, Vec<&'static str>> {
+    ) -> Self {
         let device_fn_1_0 = vk::DeviceFnV1_0::load(|name| {
             mem::transmute(instance_fn.get_device_proc_addr(device, name.as_ptr()))
-        })?;
+        });
         let device_fn_1_1 = vk::DeviceFnV1_1::load(|name| {
             mem::transmute(instance_fn.get_device_proc_addr(device, name.as_ptr()))
-        })?;
+        });
-        Ok(DeviceFpV1_1 {
+        DeviceFpV1_1 {
             device_fn_1_0,
             device_fn_1_1,
-        })
+        }
     }
 }

examples/src/lib.rs

@@ -107,7 +107,7 @@ unsafe fn create_surface<E: EntryV1_0, I: InstanceV1_0>(
         dpy: x11_display as *mut vk::Display,
     };
     let xlib_surface_loader =
-        XlibSurface::new(entry, instance).expect("Unable to load xlib surface");
+        XlibSurface::new(entry, instance);
     xlib_surface_loader.create_xlib_surface_khr(&x11_create_info, None)
 }
 
@@ -131,7 +131,7 @@ unsafe fn create_surface<E: EntryV1_0, I: InstanceV1_0>(
         hwnd: hwnd as *const c_void,
     };
     let win32_surface_loader =
-        Win32Surface::new(entry, instance).expect("Unable to load win32 surface");
+        Win32Surface::new(entry, instance);
     win32_surface_loader.create_win32_surface_khr(&win32_create_info, None)
 }
 
@@ -314,7 +314,7 @@ impl ExampleBase {
                 p_user_data: ptr::null_mut(),
             };
             let debug_report_loader =
-                DebugReport::new(&entry, &instance).expect("Unable to load debug report");
+                DebugReport::new(&entry, &instance);
             let debug_call_back = debug_report_loader
                 .create_debug_report_callback_ext(&debug_info, None)
                 .unwrap();
@@ -323,7 +323,7 @@ impl ExampleBase {
                 .enumerate_physical_devices()
                 .expect("Physical device error");
             let surface_loader =
-                Surface::new(&entry, &instance).expect("Unable to load the Surface extension");
+                Surface::new(&entry, &instance);
             let (pdevice, queue_family_index) = pdevices
                 .iter()
                 .map(|pdevice| {
@@ -425,7 +425,7 @@ impl ExampleBase {
                 .find(|&mode| mode == vk::PresentModeKHR::MAILBOX)
                 .unwrap_or(vk::PresentModeKHR::FIFO);
             let swapchain_loader =
-                Swapchain::new(&instance, &device).expect("Unable to load swapchain");
+                Swapchain::new(&instance, &device);
             let swapchain_create_info = vk::SwapchainCreateInfoKHR {
                 s_type: vk::StructureType::SWAPCHAIN_CREATE_INFO_KHR,
                 p_next: ptr::null(),

generator/src/lib.rs

@@ -687,6 +687,9 @@ pub type CommandMap<'a> = HashMap<vkxml::Identifier, &'a vkxml::Command>;
 fn generate_function_pointers(ident: Ident, commands: &[&vkxml::Command]) -> quote::Tokens {
     let names: Vec<_> = commands.iter().map(|cmd| cmd.command_ident()).collect();
     let names_ref = &names;
+    let names_ref1 = &names;
+    let names_ref2 = &names;
+    let names_ref3 = &names;
     let raw_names: Vec<_> = commands
         .iter()
         .map(|cmd| Ident::from(cmd.name.as_str()))
@@ -728,6 +731,17 @@ fn generate_function_pointers(ident: Ident, commands: &[&vkxml::Command]) -> quo
                 #(#inner_params_iter,)*
             }
         }).collect();
+    let expanded_params_unused: Vec<_> = params
+        .iter()
+        .map(|inner_params| {
+            let inner_params_iter = inner_params.iter().map(|&(ref param_name, ref param_ty)| {
+                let unused_name = Ident::from(format!("_{}", param_name).as_str());
+                quote!{#unused_name: #param_ty}
+            });
+            quote!{
+                #(#inner_params_iter,)*
+            }
+        }).collect();
     let expanded_params_ref = &expanded_params;
 
     let return_types: Vec<_> = commands
@@ -753,31 +767,28 @@ fn generate_function_pointers(ident: Ident, commands: &[&vkxml::Command]) -> quo
             }
         }
         impl #ident {
-            pub fn load<F>(mut _f: F) -> ::std::result::Result<Self, Vec<&'static str>>
+            pub fn load<F>(mut _f: F) -> Self
                 where F: FnMut(&::std::ffi::CStr) -> *const c_void
             {
-                let mut _err_str = Vec::new();
+                #ident {
-                let s = #ident {
                     #(
                         #names_ref: unsafe {
+
+                            extern "system" fn #names_ref1 (#expanded_params_unused) -> #return_types_ref {
+                                panic!("Unable to load {}", stringify!(#names_ref2))
+                            }
                             let raw_name = stringify!(#raw_names_ref);
                             let cname = ::std::ffi::CString::new(raw_name).unwrap();
                             let val = _f(&cname);
                             if val.is_null(){
-                                _err_str.push(raw_name);
+                                #names_ref3
-                            }
-                            ::std::mem::transmute(val)
-                        },
-                    )*
-                };
-
-                if _err_str.is_empty() {
-                    Ok(s)
                             }
                             else{
-                    Err(_err_str)
+                                ::std::mem::transmute(val)
+                            }
+                        },
+                    )*
                 }
-
             }
             #(
                 pub unsafe fn #names_ref(&self, #expanded_params_ref) -> #return_types_ref {