Update code to use modern c++ style

Fix warnings given by clang-tidy 8 with checks 'bugprone-*,modernize-*'

Change-Id: I2e5660c5872728f957869c66b1143cfcc76bc20e
Signed-off-by: Ben Davis <ben.davis@arm.com>

10 files changed, 29 insertions, 28 deletions

diff --git a/layer/layer.cpp b/layer/layer.cpp
index a90a336..9282662 100644
--- a/layer/layer.cpp
+++ b/layer/layer.cpp
@@ -44,26 +44,26 @@ namespace layer
 
 VKAPI_ATTR VkLayerInstanceCreateInfo *get_chain_info(const VkInstanceCreateInfo *pCreateInfo, VkLayerFunction func)
 {
-   VkLayerInstanceCreateInfo *chain_info = (VkLayerInstanceCreateInfo *)pCreateInfo->pNext;
+   auto *chain_info = reinterpret_cast<const VkLayerInstanceCreateInfo *>(pCreateInfo->pNext);
    while (chain_info &&
           !(chain_info->sType == VK_STRUCTURE_TYPE_LOADER_INSTANCE_CREATE_INFO && chain_info->function == func))
    {
-      chain_info = (VkLayerInstanceCreateInfo *)chain_info->pNext;
+      chain_info = reinterpret_cast<const VkLayerInstanceCreateInfo *>(chain_info->pNext);
    }
 
-   return chain_info;
+   return const_cast<VkLayerInstanceCreateInfo *>(chain_info);
 }
 
 VKAPI_ATTR VkLayerDeviceCreateInfo *get_chain_info(const VkDeviceCreateInfo *pCreateInfo, VkLayerFunction func)
 {
-   VkLayerDeviceCreateInfo *chain_info = (VkLayerDeviceCreateInfo *)pCreateInfo->pNext;
+   auto *chain_info = reinterpret_cast<const VkLayerDeviceCreateInfo *>(pCreateInfo->pNext);
    while (chain_info &&
           !(chain_info->sType == VK_STRUCTURE_TYPE_LOADER_DEVICE_CREATE_INFO && chain_info->function == func))
    {
-      chain_info = (VkLayerDeviceCreateInfo *)chain_info->pNext;
+      chain_info = reinterpret_cast<const VkLayerDeviceCreateInfo *>(chain_info->pNext);
    }
 
-   return chain_info;
+   return const_cast<VkLayerDeviceCreateInfo *>(chain_info);
 }
 
 template <typename T>
diff --git a/layer/private_data.cpp b/layer/private_data.cpp
index b47e7a7..6fa3d38 100644
--- a/layer/private_data.cpp
+++ b/layer/private_data.cpp
@@ -125,7 +125,7 @@ VkResult instance_private_data::associate(VkInstance instance, instance_dispatch
    auto result = g_instance_data.try_insert(std::make_pair(key, instance_data.get()));
    if (result.has_value())
    {
-      instance_data.release();
+      instance_data.release(); // NOLINT(bugprone-unused-return-value)
       return VK_SUCCESS;
    }
    else
@@ -302,7 +302,7 @@ VkResult device_private_data::associate(VkDevice dev, instance_private_data &ins
    auto result = g_device_data.try_insert(std::make_pair(key, device_data.get()));
    if (result.has_value())
    {
-      device_data.release();
+      device_data.release(); // NOLINT(bugprone-unused-return-value)
       return VK_SUCCESS;
    }
    else
diff --git a/layer/swapchain_api.cpp b/layer/swapchain_api.cpp
index 3ccbb73..e46ca87 100644
--- a/layer/swapchain_api.cpp
+++ b/layer/swapchain_api.cpp
@@ -89,7 +89,7 @@ wsi_layer_vkDestroySwapchainKHR(VkDevice device, VkSwapchainKHR swapc,
    }
 
    assert(swapc != VK_NULL_HANDLE);
-   wsi::swapchain_base *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
+   auto *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
    wsi::destroy_surface_swapchain(sc, device_data, pAllocator);
 }
 
@@ -106,7 +106,7 @@ wsi_layer_vkGetSwapchainImagesKHR(VkDevice device, VkSwapchainKHR swapc, uint32_
 
    assert(pSwapchainImageCount != nullptr);
    assert(swapc != VK_NULL_HANDLE);
-   wsi::swapchain_base *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
+   auto *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
    return sc->get_swapchain_images(pSwapchainImageCount, pSwapchainImages);
 }
 
@@ -124,7 +124,7 @@ wsi_layer_vkAcquireNextImageKHR(VkDevice device, VkSwapchainKHR swapc, uint64_t
    assert(swapc != VK_NULL_HANDLE);
    assert(semaphore != VK_NULL_HANDLE || fence != VK_NULL_HANDLE);
    assert(pImageIndex != nullptr);
-   wsi::swapchain_base *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
+   auto *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
    return sc->acquire_next_image(timeout, semaphore, fence, pImageIndex);
 }
 
@@ -146,7 +146,7 @@ wsi_layer_vkQueuePresentKHR(VkQueue queue, const VkPresentInfoKHR *pPresentInfo)
    {
       VkSwapchainKHR swapc = pPresentInfo->pSwapchains[i];
 
-      wsi::swapchain_base *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
+      auto *sc = reinterpret_cast<wsi::swapchain_base *>(swapc);
       assert(sc != nullptr);
 
       VkResult res = sc->queue_present(queue, pPresentInfo, pPresentInfo->pImageIndices[i]);
@@ -263,7 +263,7 @@ wsi_layer_vkAcquireNextImage2KHR(VkDevice device, const VkAcquireNextImageInfoKH
       return device_data.disp.AcquireNextImage2KHR(device, pAcquireInfo, pImageIndex);
    }
 
-   wsi::swapchain_base *sc = reinterpret_cast<wsi::swapchain_base *>(pAcquireInfo->swapchain);
+   auto *sc = reinterpret_cast<wsi::swapchain_base *>(pAcquireInfo->swapchain);
 
    return sc->acquire_next_image(pAcquireInfo->timeout, pAcquireInfo->semaphore, pAcquireInfo->fence, pImageIndex);
 }
@@ -274,9 +274,8 @@ wsi_layer_vkCreateImage(VkDevice device, const VkImageCreateInfo *pCreateInfo, c
 {
    auto &device_data = layer::device_private_data::get(device);
 
-   const VkImageSwapchainCreateInfoKHR *image_sc_create_info =
-      util::find_extension<VkImageSwapchainCreateInfoKHR>(VK_STRUCTURE_TYPE_IMAGE_SWAPCHAIN_CREATE_INFO_KHR,
-         pCreateInfo->pNext);
+   const auto *image_sc_create_info = util::find_extension<VkImageSwapchainCreateInfoKHR>(
+      VK_STRUCTURE_TYPE_IMAGE_SWAPCHAIN_CREATE_INFO_KHR, pCreateInfo->pNext);
 
    if (image_sc_create_info == nullptr || !device_data.layer_owns_swapchain(image_sc_create_info->swapchain))
    {
@@ -295,7 +294,7 @@ wsi_layer_vkBindImageMemory2(VkDevice device, uint32_t bindInfoCount,
 
    for (uint32_t i = 0; i < bindInfoCount; i++)
    {
-      const VkBindImageMemorySwapchainInfoKHR *bind_sc_info = util::find_extension<VkBindImageMemorySwapchainInfoKHR>(
+      const auto *bind_sc_info = util::find_extension<VkBindImageMemorySwapchainInfoKHR>(
          VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_SWAPCHAIN_INFO_KHR, pBindInfos[i].pNext);
 
       if (bind_sc_info == nullptr || bind_sc_info->swapchain == VK_NULL_HANDLE ||
diff --git a/util/custom_allocator.hpp b/util/custom_allocator.hpp
index 486fd18..829c798 100644
--- a/util/custom_allocator.hpp
+++ b/util/custom_allocator.hpp
@@ -108,7 +108,7 @@ public:
    template <typename T, typename... Args>
    util::unique_ptr<T> make_unique(Args &&...args) const noexcept;
 
-   VkAllocationCallbacks m_callbacks;
+   VkAllocationCallbacks m_callbacks{};
    VkSystemAllocationScope m_scope;
 };
 
diff --git a/util/extension_list.cpp b/util/extension_list.cpp
index 4194404..47dfa06 100644
--- a/util/extension_list.cpp
+++ b/util/extension_list.cpp
@@ -25,7 +25,7 @@
 #include "extension_list.hpp"
 #include "util/custom_allocator.hpp"
 #include <layer/private_data.hpp>
-#include <string.h>
+#include <cstring>
 #include <cassert>
 
 namespace util
diff --git a/util/timed_semaphore.cpp b/util/timed_semaphore.cpp
index 138cc9c..9b2c117 100644
--- a/util/timed_semaphore.cpp
+++ b/util/timed_semaphore.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2019 Arm Limited.
+ * Copyright (c) 2017, 2019, 2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -62,7 +62,7 @@ VkResult timed_semaphore::init(unsigned count)
    /* only programming error can cause _destroy to fail */
    assert(res == 0);
 
-   res = pthread_mutex_init(&m_mutex, NULL);
+   res = pthread_mutex_init(&m_mutex, nullptr);
    /* only programming errors can result in failure */
    assert(res == 0);
 
@@ -114,7 +114,7 @@ VkResult timed_semaphore::wait(uint64_t timeout)
                                   static_cast<long>(timeout % (1000 * 1000 * 1000))
          };
 
-         struct timespec now;
+         struct timespec now = {};
          res = clock_gettime(CLOCK_MONOTONIC, &now);
          assert(res == 0); /* only fails with programming error (EINVAL, EFAULT, EPERM) */
 
diff --git a/wsi/headless/surface_properties.cpp b/wsi/headless/surface_properties.cpp
index 326216b..9f944bf 100644
--- a/wsi/headless/surface_properties.cpp
+++ b/wsi/headless/surface_properties.cpp
@@ -96,7 +96,7 @@ VkResult surface_properties::get_surface_formats(VkPhysicalDevice physical_devic
    VkResult res = VK_SUCCESS;
    /* Construct a list of all formats supported by the driver - for color attachment */
    constexpr int max_core_1_0_formats = VK_FORMAT_ASTC_12x12_SRGB_BLOCK + 1;
-   VkFormat formats[max_core_1_0_formats];
+   std::array<VkFormat, max_core_1_0_formats> formats{};
    uint32_t format_count = 0;
 
    for (int id = 0; id < max_core_1_0_formats; id++)
diff --git a/wsi/headless/swapchain.cpp b/wsi/headless/swapchain.cpp
index 1005809..cb32e30 100644
--- a/wsi/headless/swapchain.cpp
+++ b/wsi/headless/swapchain.cpp
@@ -43,7 +43,7 @@ namespace headless
 struct image_data
 {
    /* Device memory backing the image. */
-   VkDeviceMemory memory;
+   VkDeviceMemory memory{};
    fence_sync present_fence;
 };
 
diff --git a/wsi/swapchain_base.cpp b/wsi/swapchain_base.cpp
index fdc0c29..a082735 100644
--- a/wsi/swapchain_base.cpp
+++ b/wsi/swapchain_base.cpp
@@ -171,9 +171,11 @@ void swapchain_base::unpresent_image(uint32_t presented_index)
 swapchain_base::swapchain_base(layer::device_private_data &dev_data, const VkAllocationCallbacks *callbacks)
    : m_device_data(dev_data)
    , m_page_flip_thread_run(false)
+   , m_is_valid(false)
+   , m_start_present_semaphore()
    , m_thread_sem_defined(false)
    , m_first_present(true)
-   , m_pending_buffer_pool{}
+   , m_pending_buffer_pool()
    , m_allocator(dev_data.get_allocator(), VK_SYSTEM_ALLOCATION_SCOPE_OBJECT, callbacks)
    , m_swapchain_images(m_allocator)
    , m_surface(VK_NULL_HANDLE)
@@ -372,7 +374,7 @@ VkResult swapchain_base::acquire_next_image(uint64_t timeout, VkSemaphore semaph
 
    std::unique_lock<std::recursive_mutex> image_status_lock(m_image_status_mutex);
 
-   uint32_t i;
+   size_t i;
    for (i = 0; i < m_swapchain_images.size(); ++i)
    {
       if (m_swapchain_images[i].status == swapchain_image::FREE)
@@ -529,7 +531,7 @@ void swapchain_base::wait_for_pending_buffers()
    /* Waiting for free images waits for both free and pending. One pending image may be presented and acquired by a
     * compositor. The WSI backend may not necessarily know which pending image is presented to change its state. It may
     * be impossible to wait for that one presented image. */
-   wait = m_swapchain_images.size() - acquired_images - 1;
+   wait = static_cast<int>(m_swapchain_images.size()) - acquired_images - 1;
    image_status_lock.unlock();
 
    while (wait > 0)
diff --git a/wsi/synchronization.cpp b/wsi/synchronization.cpp
index 5e5a0d0..c2c7333 100644
--- a/wsi/synchronization.cpp
+++ b/wsi/synchronization.cpp
@@ -106,7 +106,7 @@ VkResult fence_sync::set_payload(VkQueue queue, const VkSemaphore *sem_payload,
    VkPipelineStageFlags pipeline_stage_flags = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
 
    VkSubmitInfo submit_info = {
-      VK_STRUCTURE_TYPE_SUBMIT_INFO, NULL, sem_count, sem_payload, &pipeline_stage_flags, 0, NULL, 0, NULL
+      VK_STRUCTURE_TYPE_SUBMIT_INFO, nullptr, sem_count, sem_payload, &pipeline_stage_flags, 0, nullptr, 0, nullptr
    };
 
    result = dev->disp.QueueSubmit(queue, 1, &submit_info, fence);