649 lines
28 KiB
C++
649 lines
28 KiB
C++
//* Copyright 2017 The Dawn Authors
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//*
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//* Licensed under the Apache License, Version 2.0 (the "License");
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//* you may not use this file except in compliance with the License.
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//* You may obtain a copy of the License at
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//*
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//* http://www.apache.org/licenses/LICENSE-2.0
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//*
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//* Unless required by applicable law or agreed to in writing, software
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//* distributed under the License is distributed on an "AS IS" BASIS,
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//* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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//* See the License for the specific language governing permissions and
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//* limitations under the License.
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#include "dawn_wire/Wire.h"
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#include "dawn_wire/WireCmd.h"
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#include "common/Assert.h"
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#include <algorithm>
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#include <cstdlib>
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#include <cstring>
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#include <vector>
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namespace dawn_wire {
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namespace server {
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class Server;
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struct MapUserdata {
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Server* server;
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uint32_t bufferId;
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uint32_t bufferSerial;
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uint32_t requestSerial;
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uint32_t size;
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bool isWrite;
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};
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//* Stores what the backend knows about the type.
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template<typename T>
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struct ObjectDataBase {
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//* The backend-provided handle and serial to this object.
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T handle;
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uint32_t serial = 0;
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//* Built object ID and serial, needed to send to the client along with builder error callbacks
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//* TODO(cwallez@chromium.org) only have this for builder T
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uint32_t builtObjectId = 0;
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uint32_t builtObjectSerial = 0;
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//* Used by the error-propagation mechanism to know if this object is an error.
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//* TODO(cwallez@chromium.org): this is doubling the memory usage of
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//* std::vector<ObjectDataBase> consider making it a special marker value in handle instead.
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bool valid;
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//* Whether this object has been allocated, used by the KnownObjects queries
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//* TODO(cwallez@chromium.org): make this an internal bit vector in KnownObjects.
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bool allocated;
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//* TODO(cwallez@chromium.org): this is only useful for buffers
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void* mappedData = nullptr;
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size_t mappedDataSize = 0;
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};
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//* Keeps track of the mapping between client IDs and backend objects.
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template<typename T>
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class KnownObjects {
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public:
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using Data = ObjectDataBase<T>;
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KnownObjects() {
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//* Pre-allocate ID 0 to refer to the null handle.
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Data nullObject;
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nullObject.handle = nullptr;
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nullObject.valid = true;
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nullObject.allocated = true;
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mKnown.push_back(nullObject);
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}
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//* Get a backend objects for a given client ID.
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//* Returns nullptr if the ID hasn't previously been allocated.
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const Data* Get(uint32_t id) const {
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if (id >= mKnown.size()) {
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return nullptr;
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}
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const Data* data = &mKnown[id];
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if (!data->allocated) {
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return nullptr;
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}
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return data;
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}
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Data* Get(uint32_t id) {
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if (id >= mKnown.size()) {
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return nullptr;
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}
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Data* data = &mKnown[id];
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if (!data->allocated) {
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return nullptr;
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}
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return data;
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}
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//* Allocates the data for a given ID and returns it.
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//* Returns nullptr if the ID is already allocated, or too far ahead.
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//* Invalidates all the Data*
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Data* Allocate(uint32_t id) {
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if (id > mKnown.size()) {
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return nullptr;
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}
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Data data;
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data.allocated = true;
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data.valid = false;
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data.handle = nullptr;
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if (id >= mKnown.size()) {
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mKnown.push_back(data);
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return &mKnown.back();
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}
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if (mKnown[id].allocated) {
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return nullptr;
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}
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mKnown[id] = data;
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return &mKnown[id];
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}
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//* Marks an ID as deallocated
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void Free(uint32_t id) {
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ASSERT(id < mKnown.size());
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mKnown[id].allocated = false;
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}
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private:
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std::vector<Data> mKnown;
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};
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void ForwardDeviceErrorToServer(const char* message, dawnCallbackUserdata userdata);
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{% for type in by_category["object"] if type.is_builder%}
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void Forward{{type.name.CamelCase()}}ToClient(dawnBuilderErrorStatus status, const char* message, dawnCallbackUserdata userdata1, dawnCallbackUserdata userdata2);
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{% endfor %}
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void ForwardBufferMapReadAsync(dawnBufferMapAsyncStatus status, const void* ptr, dawnCallbackUserdata userdata);
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void ForwardBufferMapWriteAsync(dawnBufferMapAsyncStatus status, void* ptr, dawnCallbackUserdata userdata);
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// A really really simple implementation of the DeserializeAllocator. It's main feature
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// is that it has some inline storage so as to avoid allocations for the majority of
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// commands.
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class ServerAllocator : public DeserializeAllocator {
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public:
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ServerAllocator() {
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Reset();
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}
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~ServerAllocator() {
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Reset();
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}
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void* GetSpace(size_t size) override {
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// Return space in the current buffer if possible first.
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if (mRemainingSize >= size) {
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char* buffer = mCurrentBuffer;
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mCurrentBuffer += size;
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mRemainingSize -= size;
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return buffer;
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}
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// Otherwise allocate a new buffer and try again.
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size_t allocationSize = std::max(size, size_t(2048));
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char* allocation = static_cast<char*>(malloc(allocationSize));
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if (allocation == nullptr) {
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return nullptr;
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}
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mAllocations.push_back(allocation);
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mCurrentBuffer = allocation;
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mRemainingSize = allocationSize;
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return GetSpace(size);
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}
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void Reset() {
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for (auto allocation : mAllocations) {
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free(allocation);
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}
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mAllocations.clear();
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// The initial buffer is the inline buffer so that some allocations can be skipped
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mCurrentBuffer = mStaticBuffer;
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mRemainingSize = sizeof(mStaticBuffer);
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}
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private:
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size_t mRemainingSize = 0;
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char* mCurrentBuffer = nullptr;
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char mStaticBuffer[2048];
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std::vector<char*> mAllocations;
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};
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class Server : public CommandHandler, public ObjectIdResolver {
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public:
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Server(dawnDevice device, const dawnProcTable& procs, CommandSerializer* serializer)
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: mProcs(procs), mSerializer(serializer) {
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//* The client-server knowledge is bootstrapped with device 1.
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auto* deviceData = mKnownDevice.Allocate(1);
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deviceData->handle = device;
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deviceData->valid = true;
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auto userdata = static_cast<dawnCallbackUserdata>(reinterpret_cast<intptr_t>(this));
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procs.deviceSetErrorCallback(device, ForwardDeviceErrorToServer, userdata);
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}
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void OnDeviceError(const char* message) {
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ReturnDeviceErrorCallbackCmd cmd;
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cmd.messageStrlen = std::strlen(message);
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auto allocCmd = static_cast<ReturnDeviceErrorCallbackCmd*>(GetCmdSpace(sizeof(cmd)));
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*allocCmd = cmd;
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char* messageAlloc = static_cast<char*>(GetCmdSpace(cmd.messageStrlen + 1));
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strcpy(messageAlloc, message);
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}
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{% for type in by_category["object"] if type.is_builder%}
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{% set Type = type.name.CamelCase() %}
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void On{{Type}}Error(dawnBuilderErrorStatus status, const char* message, uint32_t id, uint32_t serial) {
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auto* builder = mKnown{{Type}}.Get(id);
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if (builder == nullptr || builder->serial != serial) {
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return;
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}
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if (status != DAWN_BUILDER_ERROR_STATUS_SUCCESS) {
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builder->valid = false;
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}
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if (status != DAWN_BUILDER_ERROR_STATUS_UNKNOWN) {
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//* Unknown is the only status that can be returned without a call to GetResult
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//* so we are guaranteed to have created an object.
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ASSERT(builder->builtObjectId != 0);
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Return{{Type}}ErrorCallbackCmd cmd;
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cmd.builtObjectId = builder->builtObjectId;
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cmd.builtObjectSerial = builder->builtObjectSerial;
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cmd.status = status;
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cmd.messageStrlen = std::strlen(message);
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auto allocCmd = static_cast<Return{{Type}}ErrorCallbackCmd*>(GetCmdSpace(sizeof(cmd)));
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*allocCmd = cmd;
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char* messageAlloc = static_cast<char*>(GetCmdSpace(strlen(message) + 1));
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strcpy(messageAlloc, message);
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}
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}
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{% endfor %}
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void OnMapReadAsyncCallback(dawnBufferMapAsyncStatus status, const void* ptr, MapUserdata* data) {
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ReturnBufferMapReadAsyncCallbackCmd cmd;
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cmd.bufferId = data->bufferId;
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cmd.bufferSerial = data->bufferSerial;
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cmd.requestSerial = data->requestSerial;
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cmd.status = status;
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cmd.dataLength = 0;
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auto allocCmd = static_cast<ReturnBufferMapReadAsyncCallbackCmd*>(GetCmdSpace(sizeof(cmd)));
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*allocCmd = cmd;
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if (status == DAWN_BUFFER_MAP_ASYNC_STATUS_SUCCESS) {
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allocCmd->dataLength = data->size;
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void* dataAlloc = GetCmdSpace(data->size);
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memcpy(dataAlloc, ptr, data->size);
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}
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delete data;
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}
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void OnMapWriteAsyncCallback(dawnBufferMapAsyncStatus status, void* ptr, MapUserdata* data) {
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ReturnBufferMapWriteAsyncCallbackCmd cmd;
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cmd.bufferId = data->bufferId;
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cmd.bufferSerial = data->bufferSerial;
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cmd.requestSerial = data->requestSerial;
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cmd.status = status;
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auto allocCmd = static_cast<ReturnBufferMapWriteAsyncCallbackCmd*>(GetCmdSpace(sizeof(cmd)));
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*allocCmd = cmd;
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if (status == DAWN_BUFFER_MAP_ASYNC_STATUS_SUCCESS) {
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auto* selfData = mKnownBuffer.Get(data->bufferId);
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ASSERT(selfData != nullptr);
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selfData->mappedData = ptr;
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selfData->mappedDataSize = data->size;
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}
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delete data;
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}
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const char* HandleCommands(const char* commands, size_t size) override {
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mProcs.deviceTick(mKnownDevice.Get(1)->handle);
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while (size >= sizeof(WireCmd)) {
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WireCmd cmdId = *reinterpret_cast<const WireCmd*>(commands);
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bool success = false;
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switch (cmdId) {
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{% for type in by_category["object"] %}
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{% for method in type.methods %}
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{% set Suffix = as_MethodSuffix(type.name, method.name) %}
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case WireCmd::{{Suffix}}:
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success = Handle{{Suffix}}(&commands, &size);
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break;
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{% endfor %}
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{% set Suffix = as_MethodSuffix(type.name, Name("destroy")) %}
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case WireCmd::{{Suffix}}:
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success = Handle{{Suffix}}(&commands, &size);
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break;
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{% endfor %}
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case WireCmd::BufferMapAsync:
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success = HandleBufferMapAsync(&commands, &size);
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break;
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case WireCmd::BufferUpdateMappedDataCmd:
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success = HandleBufferUpdateMappedData(&commands, &size);
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break;
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default:
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success = false;
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}
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if (!success) {
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return nullptr;
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}
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mAllocator.Reset();
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}
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if (size != 0) {
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return nullptr;
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}
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return commands;
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}
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private:
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dawnProcTable mProcs;
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CommandSerializer* mSerializer = nullptr;
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ServerAllocator mAllocator;
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void* GetCmdSpace(size_t size) {
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return mSerializer->GetCmdSpace(size);
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}
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// Implementation of the ObjectIdResolver interface
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{% for type in by_category["object"] %}
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DeserializeResult GetFromId(ObjectId id, {{as_cType(type.name)}}* out) const final {
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auto data = mKnown{{type.name.CamelCase()}}.Get(id);
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if (data == nullptr) {
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return DeserializeResult::FatalError;
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}
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*out = data->handle;
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if (data->valid) {
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return DeserializeResult::Success;
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} else {
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return DeserializeResult::ErrorObject;
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}
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}
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DeserializeResult GetOptionalFromId(ObjectId id, {{as_cType(type.name)}}* out) const final {
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if (id == 0) {
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*out = nullptr;
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return DeserializeResult::Success;
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}
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return GetFromId(id, out);
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}
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{% endfor %}
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//* The list of known IDs for each object type.
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{% for type in by_category["object"] %}
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KnownObjects<{{as_cType(type.name)}}> mKnown{{type.name.CamelCase()}};
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{% endfor %}
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//* Helper function for the getting of the command data in command handlers.
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//* Checks there is enough data left, updates the buffer / size and returns
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//* the command (or nullptr for an error).
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template <typename T>
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static const T* GetData(const char** buffer, size_t* size, size_t count) {
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// TODO(cwallez@chromium.org): Check for overflow
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size_t totalSize = count * sizeof(T);
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if (*size < totalSize) {
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return nullptr;
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}
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const T* data = reinterpret_cast<const T*>(*buffer);
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*buffer += totalSize;
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*size -= totalSize;
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return data;
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}
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template <typename T>
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static const T* GetCommand(const char** commands, size_t* size) {
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return GetData<T>(commands, size, 1);
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}
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{% set custom_pre_handler_commands = ["BufferUnmap"] %}
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bool PreHandleBufferUnmap(const BufferUnmapCmd& cmd) {
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auto* selfData = mKnownBuffer.Get(cmd.selfId);
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ASSERT(selfData != nullptr);
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selfData->mappedData = nullptr;
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return true;
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}
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//* Implementation of the command handlers
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{% for type in by_category["object"] %}
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{% for method in type.methods %}
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{% set Suffix = as_MethodSuffix(type.name, method.name) %}
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//* The generic command handlers
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bool Handle{{Suffix}}(const char** commands, size_t* size) {
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{{Suffix}}Cmd cmd;
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DeserializeResult deserializeResult = cmd.Deserialize(commands, size, &mAllocator, *this);
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if (deserializeResult == DeserializeResult::FatalError) {
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return false;
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}
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{% if Suffix in custom_pre_handler_commands %}
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if (!PreHandle{{Suffix}}(cmd)) {
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return false;
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}
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{% endif %}
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//* Unpack 'self'
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auto* selfData = mKnown{{type.name.CamelCase()}}.Get(cmd.selfId);
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ASSERT(selfData != nullptr);
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//* In all cases allocate the object data as it will be refered-to by the client.
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{% set return_type = method.return_type %}
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{% set returns = return_type.name.canonical_case() != "void" %}
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{% if returns %}
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{% set Type = method.return_type.name.CamelCase() %}
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auto* resultData = mKnown{{Type}}.Allocate(cmd.resultId);
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if (resultData == nullptr) {
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return false;
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}
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resultData->serial = cmd.resultSerial;
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{% if type.is_builder %}
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selfData->builtObjectId = cmd.resultId;
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selfData->builtObjectSerial = cmd.resultSerial;
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{% endif %}
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{% endif %}
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//* After the data is allocated, apply the argument error propagation mechanism
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if (deserializeResult == DeserializeResult::ErrorObject) {
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{% if type.is_builder %}
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selfData->valid = false;
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//* If we are in GetResult, fake an error callback
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{% if returns %}
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On{{type.name.CamelCase()}}Error(DAWN_BUILDER_ERROR_STATUS_ERROR, "Maybe monad", cmd.selfId, selfData->serial);
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{% endif %}
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{% endif %}
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return true;
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}
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{% if returns %}
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auto result ={{" "}}
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{%- endif %}
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mProcs.{{as_varName(type.name, method.name)}}(cmd.self
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{%- for arg in method.arguments -%}
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, cmd.{{as_varName(arg.name)}}
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{%- endfor -%}
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);
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{% if returns %}
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resultData->handle = result;
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resultData->valid = result != nullptr;
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//* builders remember the ID of the object they built so that they can send it
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//* in the callback to the client.
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{% if return_type.is_builder %}
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if (result != nullptr) {
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uint64_t userdata1 = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(this));
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uint64_t userdata2 = (uint64_t(resultData->serial) << uint64_t(32)) + cmd.resultId;
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mProcs.{{as_varName(return_type.name, Name("set error callback"))}}(result, Forward{{return_type.name.CamelCase()}}ToClient, userdata1, userdata2);
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}
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{% endif %}
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{% endif %}
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return true;
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}
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{% endfor %}
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//* Handlers for the destruction of objects: clients do the tracking of the
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//* reference / release and only send destroy on refcount = 0.
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{% set Suffix = as_MethodSuffix(type.name, Name("destroy")) %}
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bool Handle{{Suffix}}(const char** commands, size_t* size) {
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const auto* cmd = GetCommand<{{Suffix}}Cmd>(commands, size);
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if (cmd == nullptr) {
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return false;
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}
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ObjectId objectId = cmd->objectId;
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//* ID 0 are reserved for nullptr and cannot be destroyed.
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if (objectId == 0) {
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return false;
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}
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auto* data = mKnown{{type.name.CamelCase()}}.Get(objectId);
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if (data == nullptr) {
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return false;
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}
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if (data->valid) {
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mProcs.{{as_varName(type.name, Name("release"))}}(data->handle);
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}
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mKnown{{type.name.CamelCase()}}.Free(objectId);
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return true;
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}
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{% endfor %}
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bool HandleBufferMapAsync(const char** commands, size_t* size) {
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//* These requests are just forwarded to the buffer, with userdata containing what the client
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//* will require in the return command.
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const auto* cmd = GetCommand<BufferMapAsyncCmd>(commands, size);
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if (cmd == nullptr) {
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return false;
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}
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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->bufferId = bufferId;
|
|
data->bufferSerial = 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 HandleBufferUpdateMappedData(const char** commands, size_t* size) {
|
|
const auto* cmd = GetCommand<BufferUpdateMappedDataCmd>(commands, size);
|
|
if (cmd == nullptr) {
|
|
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;
|
|
}
|
|
|
|
const char* data = GetData<char>(commands, size, dataLength);
|
|
if (data == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
memcpy(buffer->mappedData, data, dataLength);
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
void ForwardDeviceErrorToServer(const char* message, dawnCallbackUserdata userdata) {
|
|
auto server = reinterpret_cast<Server*>(static_cast<intptr_t>(userdata));
|
|
server->OnDeviceError(message);
|
|
}
|
|
|
|
{% for type in by_category["object"] if type.is_builder%}
|
|
void Forward{{type.name.CamelCase()}}ToClient(dawnBuilderErrorStatus status, const char* message, dawnCallbackUserdata userdata1, dawnCallbackUserdata userdata2) {
|
|
auto server = reinterpret_cast<Server*>(static_cast<uintptr_t>(userdata1));
|
|
uint32_t id = userdata2 & 0xFFFFFFFFu;
|
|
uint32_t serial = userdata2 >> uint64_t(32);
|
|
server->On{{type.name.CamelCase()}}Error(status, message, id, serial);
|
|
}
|
|
{% endfor %}
|
|
|
|
void ForwardBufferMapReadAsync(dawnBufferMapAsyncStatus status, const void* ptr, dawnCallbackUserdata userdata) {
|
|
auto data = reinterpret_cast<MapUserdata*>(static_cast<uintptr_t>(userdata));
|
|
data->server->OnMapReadAsyncCallback(status, ptr, data);
|
|
}
|
|
|
|
void ForwardBufferMapWriteAsync(dawnBufferMapAsyncStatus status, void* ptr, dawnCallbackUserdata userdata) {
|
|
auto data = reinterpret_cast<MapUserdata*>(static_cast<uintptr_t>(userdata));
|
|
data->server->OnMapWriteAsyncCallback(status, ptr, data);
|
|
}
|
|
}
|
|
|
|
CommandHandler* NewServerCommandHandler(dawnDevice device, const dawnProcTable& procs, CommandSerializer* serializer) {
|
|
return new server::Server(device, procs, serializer);
|
|
}
|
|
|
|
} // namespace dawn_wire
|