From 344a0c91f27a848d6bd21f9a166bc044054331ff Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Mon, 23 Jul 2018 14:48:53 -0400
Subject: [PATCH 1/2] vi: std::move std::vector in constructors where
 applicable

Allows avoiding unnecessary copies of the vector depending on the
calling code.

While we're at it, remove a redundant no-parameter base constructor call
---
 src/core/hle/service/vi/vi.cpp | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index 3a69b85f9..049957503 100644
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <array>
 #include <memory>
+#include <utility>
 #include <boost/optional.hpp>
 #include "common/alignment.h"
 #include "common/math_util.h"
@@ -176,7 +177,7 @@ private:
 
 class IGBPConnectRequestParcel : public Parcel {
 public:
-    explicit IGBPConnectRequestParcel(const std::vector<u8>& buffer) : Parcel(buffer) {
+    explicit IGBPConnectRequestParcel(std::vector<u8> buffer) : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPConnectRequestParcel() override = default;
@@ -223,8 +224,8 @@ private:
 
 class IGBPSetPreallocatedBufferRequestParcel : public Parcel {
 public:
-    explicit IGBPSetPreallocatedBufferRequestParcel(const std::vector<u8>& buffer)
-        : Parcel(buffer) {
+    explicit IGBPSetPreallocatedBufferRequestParcel(std::vector<u8> buffer)
+        : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPSetPreallocatedBufferRequestParcel() override = default;
@@ -256,7 +257,7 @@ protected:
 
 class IGBPDequeueBufferRequestParcel : public Parcel {
 public:
-    explicit IGBPDequeueBufferRequestParcel(const std::vector<u8>& buffer) : Parcel(buffer) {
+    explicit IGBPDequeueBufferRequestParcel(std::vector<u8> buffer) : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPDequeueBufferRequestParcel() override = default;
@@ -307,7 +308,7 @@ protected:
 
 class IGBPRequestBufferRequestParcel : public Parcel {
 public:
-    explicit IGBPRequestBufferRequestParcel(const std::vector<u8>& buffer) : Parcel(buffer) {
+    explicit IGBPRequestBufferRequestParcel(std::vector<u8> buffer) : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPRequestBufferRequestParcel() override = default;
@@ -322,8 +323,7 @@ public:
 
 class IGBPRequestBufferResponseParcel : public Parcel {
 public:
-    explicit IGBPRequestBufferResponseParcel(NVFlinger::IGBPBuffer buffer)
-        : Parcel(), buffer(buffer) {}
+    explicit IGBPRequestBufferResponseParcel(NVFlinger::IGBPBuffer buffer) : buffer(buffer) {}
     ~IGBPRequestBufferResponseParcel() override = default;
 
 protected:
@@ -340,7 +340,7 @@ protected:
 
 class IGBPQueueBufferRequestParcel : public Parcel {
 public:
-    explicit IGBPQueueBufferRequestParcel(const std::vector<u8>& buffer) : Parcel(buffer) {
+    explicit IGBPQueueBufferRequestParcel(std::vector<u8> buffer) : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPQueueBufferRequestParcel() override = default;
@@ -409,7 +409,7 @@ private:
 
 class IGBPQueryRequestParcel : public Parcel {
 public:
-    explicit IGBPQueryRequestParcel(const std::vector<u8>& buffer) : Parcel(buffer) {
+    explicit IGBPQueryRequestParcel(std::vector<u8> buffer) : Parcel(std::move(buffer)) {
         Deserialize();
     }
     ~IGBPQueryRequestParcel() override = default;

From 1432912ae88e750ae0aae8972d7e260538d271df Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Mon, 23 Jul 2018 14:52:32 -0400
Subject: [PATCH 2/2] vi: Add std::is_trivially_copyable checks to Read and
 Write functions

It's undefined behavior to memcpy an object that isn't considered
trivially copyable, so put a compile-time check in to make sure this
doesn't occur.
---
 src/core/hle/service/vi/vi.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index 049957503..993f1e65a 100644
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <array>
 #include <memory>
+#include <type_traits>
 #include <utility>
 #include <boost/optional.hpp>
 #include "common/alignment.h"
@@ -44,7 +45,9 @@ public:
 
     template <typename T>
     T Read() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
         ASSERT(read_index + sizeof(T) <= buffer.size());
+
         T val;
         std::memcpy(&val, buffer.data() + read_index, sizeof(T));
         read_index += sizeof(T);
@@ -54,7 +57,9 @@ public:
 
     template <typename T>
     T ReadUnaligned() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
         ASSERT(read_index + sizeof(T) <= buffer.size());
+
         T val;
         std::memcpy(&val, buffer.data() + read_index, sizeof(T));
         read_index += sizeof(T);
@@ -88,8 +93,12 @@ public:
 
     template <typename T>
     void Write(const T& val) {
-        if (buffer.size() < write_index + sizeof(T))
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        if (buffer.size() < write_index + sizeof(T)) {
             buffer.resize(buffer.size() + sizeof(T) + DefaultBufferSize);
+        }
+
         std::memcpy(buffer.data() + write_index, &val, sizeof(T));
         write_index += sizeof(T);
         write_index = Common::AlignUp(write_index, 4);
@@ -97,7 +106,9 @@ public:
 
     template <typename T>
     void WriteObject(const T& val) {
-        u32_le size = static_cast<u32>(sizeof(val));
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        const u32_le size = static_cast<u32>(sizeof(val));
         Write(size);
         // TODO(Subv): Support file descriptors.
         Write<u32_le>(0); // Fd count.