Separate WireServer.cpp into multiple files.

This patch copies methods and classes from WireServer.cpp and
distributes them over multiple files. Headers and forward declarations
are added as necessary, but no functional changes are made.

Bug: dawn:88
Change-Id: I471b8c27804916257eff266a51d087ba1ddbfeb6
Reviewed-on: https://dawn-review.googlesource.com/c/4000
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/dawn_wire/server/ServerBuffer.cpp

@@ -0,0 +1,183 @@
+// Copyright 2019 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "common/Assert.h"
+#include "dawn_wire/server/Server.h"
+
+#include <memory>
+
+namespace dawn_wire { namespace server {
+
+    bool Server::PreHandleBufferUnmap(const BufferUnmapCmd& cmd) {
+        auto* selfData = mKnownBuffer.Get(cmd.selfId);
+        ASSERT(selfData != nullptr);
+
+        selfData->mappedData = nullptr;
+
+        return true;
+    }
+
+    bool Server::HandleBufferMapAsync(const char** commands, size_t* size) {
+        // These requests are just forwarded to the buffer, with userdata containing what the
+        // client will require in the return command.
+        BufferMapAsyncCmd cmd;
+        DeserializeResult deserializeResult = cmd.Deserialize(commands, size, &mAllocator);
+
+        if (deserializeResult == DeserializeResult::FatalError) {
+            return false;
+        }
+
+        ObjectId bufferId = cmd.bufferId;
+        uint32_t requestSerial = cmd.requestSerial;
+        uint32_t requestSize = cmd.size;
+        uint32_t requestStart = cmd.start;
+        bool isWrite = cmd.isWrite;
+
+        // The null object isn't valid as `self`
+        if (bufferId == 0) {
+            return false;
+        }
+
+        auto* buffer = mKnownBuffer.Get(bufferId);
+        if (buffer == nullptr) {
+            return false;
+        }
+
+        auto* data = new MapUserdata;
+        data->server = this;
+        data->buffer = ObjectHandle{bufferId, buffer->serial};
+        data->requestSerial = requestSerial;
+        data->size = requestSize;
+        data->isWrite = isWrite;
+
+        auto userdata = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(data));
+
+        if (!buffer->valid) {
+            // Fake the buffer returning a failure, data will be freed in this call.
+            if (isWrite) {
+                ForwardBufferMapWriteAsync(DAWN_BUFFER_MAP_ASYNC_STATUS_ERROR, nullptr, userdata);
+            } else {
+                ForwardBufferMapReadAsync(DAWN_BUFFER_MAP_ASYNC_STATUS_ERROR, nullptr, userdata);
+            }
+            return true;
+        }
+
+        if (isWrite) {
+            mProcs.bufferMapWriteAsync(buffer->handle, requestStart, requestSize,
+                                       ForwardBufferMapWriteAsync, userdata);
+        } else {
+            mProcs.bufferMapReadAsync(buffer->handle, requestStart, requestSize,
+                                      ForwardBufferMapReadAsync, userdata);
+        }
+
+        return true;
+    }
+
+    bool Server::HandleBufferUpdateMappedData(const char** commands, size_t* size) {
+        BufferUpdateMappedDataCmd cmd;
+        DeserializeResult deserializeResult = cmd.Deserialize(commands, size, &mAllocator);
+
+        if (deserializeResult == DeserializeResult::FatalError) {
+            return false;
+        }
+
+        ObjectId bufferId = cmd.bufferId;
+        size_t dataLength = cmd.dataLength;
+
+        // The null object isn't valid as `self`
+        if (bufferId == 0) {
+            return false;
+        }
+
+        auto* buffer = mKnownBuffer.Get(bufferId);
+        if (buffer == nullptr || !buffer->valid || buffer->mappedData == nullptr ||
+            buffer->mappedDataSize != dataLength) {
+            return false;
+        }
+
+        DAWN_ASSERT(cmd.data != nullptr);
+
+        memcpy(buffer->mappedData, cmd.data, dataLength);
+
+        return true;
+    }
+
+    void Server::ForwardBufferMapReadAsync(dawnBufferMapAsyncStatus status,
+                                           const void* ptr,
+                                           dawnCallbackUserdata userdata) {
+        auto data = reinterpret_cast<MapUserdata*>(static_cast<uintptr_t>(userdata));
+        data->server->OnBufferMapReadAsyncCallback(status, ptr, data);
+    }
+
+    void Server::ForwardBufferMapWriteAsync(dawnBufferMapAsyncStatus status,
+                                            void* ptr,
+                                            dawnCallbackUserdata userdata) {
+        auto data = reinterpret_cast<MapUserdata*>(static_cast<uintptr_t>(userdata));
+        data->server->OnBufferMapWriteAsyncCallback(status, ptr, data);
+    }
+
+    void Server::OnBufferMapReadAsyncCallback(dawnBufferMapAsyncStatus status,
+                                              const void* ptr,
+                                              MapUserdata* userdata) {
+        std::unique_ptr<MapUserdata> data(userdata);
+
+        // Skip sending the callback if the buffer has already been destroyed.
+        auto* bufferData = mKnownBuffer.Get(data->buffer.id);
+        if (bufferData == nullptr || bufferData->serial != data->buffer.serial) {
+            return;
+        }
+
+        ReturnBufferMapReadAsyncCallbackCmd cmd;
+        cmd.buffer = data->buffer;
+        cmd.requestSerial = data->requestSerial;
+        cmd.status = status;
+        cmd.dataLength = 0;
+        cmd.data = reinterpret_cast<const uint8_t*>(ptr);
+
+        if (status == DAWN_BUFFER_MAP_ASYNC_STATUS_SUCCESS) {
+            cmd.dataLength = data->size;
+        }
+
+        size_t requiredSize = cmd.GetRequiredSize();
+        char* allocatedBuffer = static_cast<char*>(GetCmdSpace(requiredSize));
+        cmd.Serialize(allocatedBuffer);
+    }
+
+    void Server::OnBufferMapWriteAsyncCallback(dawnBufferMapAsyncStatus status,
+                                               void* ptr,
+                                               MapUserdata* userdata) {
+        std::unique_ptr<MapUserdata> data(userdata);
+
+        // Skip sending the callback if the buffer has already been destroyed.
+        auto* bufferData = mKnownBuffer.Get(data->buffer.id);
+        if (bufferData == nullptr || bufferData->serial != data->buffer.serial) {
+            return;
+        }
+
+        ReturnBufferMapWriteAsyncCallbackCmd cmd;
+        cmd.buffer = data->buffer;
+        cmd.requestSerial = data->requestSerial;
+        cmd.status = status;
+
+        size_t requiredSize = cmd.GetRequiredSize();
+        char* allocatedBuffer = static_cast<char*>(GetCmdSpace(requiredSize));
+        cmd.Serialize(allocatedBuffer);
+
+        if (status == DAWN_BUFFER_MAP_ASYNC_STATUS_SUCCESS) {
+            bufferData->mappedData = ptr;
+            bufferData->mappedDataSize = data->size;
+        }
+    }
+
+}}  // namespace dawn_wire::server