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dawn-cmake/generator/templates/dawn/wire/WireCmd.cpp

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//* Copyright 2017 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 "dawn/wire/WireCmd_autogen.h"
#include "dawn/common/Assert.h"
#include "dawn/common/Log.h"
#include "dawn/wire/BufferConsumer_impl.h"
#include "dawn/wire/Wire.h"
#include <algorithm>
#include <cstring>
#include <limits>
#ifdef __GNUC__
// error: 'offsetof' within non-standard-layout type 'wgpu::XXX' is conditionally-supported
#pragma GCC diagnostic ignored "-Winvalid-offsetof"
#endif
//* Helper macros so that the main [de]serialization functions can be written in a generic manner.
//* Outputs an rvalue that's the number of elements a pointer member points to.
{% macro member_length(member, record_accessor) -%}
{%- if member.length == "constant" -%}
{{member.constant_length}}u
{%- else -%}
{{record_accessor}}{{as_varName(member.length.name)}}
{%- endif -%}
{%- endmacro %}
//* Outputs the type that will be used on the wire for the member
{% macro member_transfer_type(member) -%}
{%- if member.type.category == "object" -%}
ObjectId
{%- elif member.type.category == "structure" -%}
{{as_cType(member.type.name)}}Transfer
{%- elif member.type.category == "bitmask" -%}
{{as_cType(member.type.name)}}Flags
{%- else -%}
{{ assert(as_cType(member.type.name) != "size_t") }}
{{as_cType(member.type.name)}}
{%- endif -%}
{%- endmacro %}
//* Outputs the size of one element of the type that will be used on the wire for the member
{% macro member_transfer_sizeof(member) -%}
sizeof({{member_transfer_type(member)}})
{%- endmacro %}
//* Outputs the serialization code to put `in` in `out`
{% macro serialize_member(member, in, out) %}
{%- if member.type.category == "object" -%}
{%- set Optional = "Optional" if member.optional else "" -%}
WIRE_TRY(provider.Get{{Optional}}Id({{in}}, &{{out}}));
{%- elif member.type.category == "structure" -%}
//* Do not memcpy or we may serialize padding bytes which can leak information across a
//* trusted boundary.
{%- set Provider = ", provider" if member.type.may_have_dawn_object else "" -%}
WIRE_TRY({{as_cType(member.type.name)}}Serialize({{in}}, &{{out}}, buffer{{Provider}}));
{%- else -%}
{{out}} = {{in}};
{%- endif -%}
{% endmacro %}
//* Outputs the deserialization code to put `in` in `out`
{% macro deserialize_member(member, in, out) %}
{%- if member.type.category == "object" -%}
{%- set Optional = "Optional" if member.optional else "" -%}
WIRE_TRY(resolver.Get{{Optional}}FromId({{in}}, &{{out}}));
{%- elif member.type.category == "structure" -%}
{%- if member.type.is_wire_transparent -%}
static_assert(sizeof({{out}}) == sizeof({{in}}), "Deserialize memcpy size must match.");
memcpy(&{{out}}, const_cast<const {{member_transfer_type(member)}}*>(&{{in}}), {{member_transfer_sizeof(member)}});
{%- else -%}
WIRE_TRY({{as_cType(member.type.name)}}Deserialize(&{{out}}, &{{in}}, deserializeBuffer, allocator
{%- if member.type.may_have_dawn_object -%}
, resolver
{%- endif -%}
));
{%- endif -%}
{%- else -%}
static_assert(sizeof({{out}}) >= sizeof({{in}}), "Deserialize assignment may not narrow.");
{{out}} = {{in}};
{%- endif -%}
{% endmacro %}
//* The main [de]serialization macro
//* Methods are very similar to structures that have one member corresponding to each arguments.
//* This macro takes advantage of the similarity to output [de]serialization code for a record
//* that is either a structure or a method, with some special cases for each.
{% macro write_record_serialization_helpers(record, name, members, is_cmd=False, is_return_command=False) %}
{% set Return = "Return" if is_return_command else "" %}
{% set Cmd = "Cmd" if is_cmd else "" %}
{% set Inherits = " : CmdHeader" if is_cmd else "" %}
//* Structure for the wire format of each of the records. Members that are values
//* are embedded directly in the structure. Other members are assumed to be in the
//* memory directly following the structure in the buffer.
struct {{Return}}{{name}}Transfer{{Inherits}} {
static_assert({{[is_cmd, record.extensible, record.chained].count(True)}} <= 1,
"Record must be at most one of is_cmd, extensible, and chained.");
{% if is_cmd %}
//* Start the transfer structure with the command ID, so that casting to WireCmd gives the ID.
{{Return}}WireCmd commandId;
{% elif record.extensible %}
bool hasNextInChain;
{% elif record.chained %}
WGPUChainedStructTransfer chain;
{% endif %}
//* Value types are directly in the command, objects being replaced with their IDs.
{% for member in members if member.annotation == "value" %}
{{member_transfer_type(member)}} {{as_varName(member.name)}};
{% endfor %}
//* const char* have their length embedded directly in the command.
{% for member in members if member.length == "strlen" %}
uint64_t {{as_varName(member.name)}}Strlen;
{% endfor %}
{% for member in members if member.optional and member.annotation != "value" and member.type.category != "object" %}
bool has_{{as_varName(member.name)}};
{% endfor %}
};
{% if is_cmd %}
static_assert(offsetof({{Return}}{{name}}Transfer, commandSize) == 0);
static_assert(offsetof({{Return}}{{name}}Transfer, commandId) == sizeof(CmdHeader));
{% endif %}
{% if record.chained %}
static_assert(offsetof({{Return}}{{name}}Transfer, chain) == 0);
{% endif %}
//* Returns the required transfer size for `record` in addition to the transfer structure.
DAWN_DECLARE_UNUSED size_t {{Return}}{{name}}GetExtraRequiredSize(const {{Return}}{{name}}{{Cmd}}& record) {
DAWN_UNUSED(record);
size_t result = 0;
//* Gather how much space will be needed for the extension chain.
{% if record.extensible %}
if (record.nextInChain != nullptr) {
result += GetChainedStructExtraRequiredSize(record.nextInChain);
}
{% endif %}
//* Special handling of const char* that have their length embedded directly in the command
{% for member in members if member.length == "strlen" %}
{% set memberName = as_varName(member.name) %}
{% if member.optional %}
bool has_{{memberName}} = record.{{memberName}} != nullptr;
if (has_{{memberName}})
{% else %}
ASSERT(record.{{memberName}} != nullptr);
{% endif %}
{
result += Align(std::strlen(record.{{memberName}}), kWireBufferAlignment);
}
{% endfor %}
//* Gather how much space will be needed for pointer members.
{% for member in members if member.length != "strlen" and not member.skip_serialize %}
{% if member.type.category != "object" and member.optional %}
if (record.{{as_varName(member.name)}} != nullptr)
{% endif %}
{
{% if member.annotation != "value" %}
{{ assert(member.annotation != "const*const*") }}
auto memberLength = {{member_length(member, "record.")}};
auto size = WireAlignSizeofN<{{member_transfer_type(member)}}>(memberLength);
ASSERT(size);
result += *size;
//* Structures might contain more pointers so we need to add their extra size as well.
{% if member.type.category == "structure" %}
for (decltype(memberLength) i = 0; i < memberLength; ++i) {
{{assert(member.annotation == "const*")}}
result += {{as_cType(member.type.name)}}GetExtraRequiredSize(record.{{as_varName(member.name)}}[i]);
}
{% endif %}
{% elif member.type.category == "structure" %}
result += {{as_cType(member.type.name)}}GetExtraRequiredSize(record.{{as_varName(member.name)}});
{% endif %}
}
{% endfor %}
return result;
}
// GetExtraRequiredSize isn't used for structures that are value members of other structures
// because we assume they cannot contain pointers themselves.
DAWN_UNUSED_FUNC({{Return}}{{name}}GetExtraRequiredSize);
//* Serializes `record` into `transfer`, using `buffer` to get more space for pointed-to data
//* and `provider` to serialize objects.
DAWN_DECLARE_UNUSED WireResult {{Return}}{{name}}Serialize(
const {{Return}}{{name}}{{Cmd}}& record,
{{Return}}{{name}}Transfer* transfer,
SerializeBuffer* buffer
{%- if record.may_have_dawn_object -%}
, const ObjectIdProvider& provider
{%- endif -%}
) {
DAWN_UNUSED(buffer);
//* Handle special transfer members of methods.
{% if is_cmd %}
transfer->commandId = {{Return}}WireCmd::{{name}};
{% endif %}
//* Value types are directly in the transfer record, objects being replaced with their IDs.
{% for member in members if member.annotation == "value" %}
{% set memberName = as_varName(member.name) %}
{{serialize_member(member, "record." + memberName, "transfer->" + memberName)}}
{% endfor %}
{% if record.extensible %}
if (record.nextInChain != nullptr) {
transfer->hasNextInChain = true;
WIRE_TRY(SerializeChainedStruct(record.nextInChain, buffer, provider));
} else {
transfer->hasNextInChain = false;
}
{% endif %}
{% if record.chained %}
//* Should be set by the root descriptor's call to SerializeChainedStruct.
ASSERT(transfer->chain.sType == {{as_cEnum(types["s type"].name, record.name)}});
ASSERT(transfer->chain.hasNext == (record.chain.next != nullptr));
{% endif %}
//* Special handling of const char* that have their length embedded directly in the command
{% for member in members if member.length == "strlen" %}
{% set memberName = as_varName(member.name) %}
{% if member.optional %}
bool has_{{memberName}} = record.{{memberName}} != nullptr;
transfer->has_{{memberName}} = has_{{memberName}};
if (has_{{memberName}})
{% endif %}
{
transfer->{{memberName}}Strlen = std::strlen(record.{{memberName}});
char* stringInBuffer;
WIRE_TRY(buffer->NextN(transfer->{{memberName}}Strlen, &stringInBuffer));
memcpy(stringInBuffer, record.{{memberName}}, transfer->{{memberName}}Strlen);
}
{% endfor %}
//* Allocate space and write the non-value arguments in it.
{% for member in members if member.annotation != "value" and member.length != "strlen" and not member.skip_serialize %}
{{ assert(member.annotation != "const*const*") }}
{% set memberName = as_varName(member.name) %}
{% if member.type.category != "object" and member.optional %}
bool has_{{memberName}} = record.{{memberName}} != nullptr;
transfer->has_{{memberName}} = has_{{memberName}};
if (has_{{memberName}})
{% endif %}
{
auto memberLength = {{member_length(member, "record.")}};
{{member_transfer_type(member)}}* memberBuffer;
WIRE_TRY(buffer->NextN(memberLength, &memberBuffer));
{% if member.type.is_wire_transparent %}
memcpy(
memberBuffer, record.{{memberName}},
{{member_transfer_sizeof(member)}} * memberLength);
{% else %}
//* This loop cannot overflow because it iterates up to |memberLength|. Even if
//* memberLength were the maximum integer value, |i| would become equal to it
//* just before exiting the loop, but not increment past or wrap around.
for (decltype(memberLength) i = 0; i < memberLength; ++i) {
{{serialize_member(member, "record." + memberName + "[i]", "memberBuffer[i]" )}}
}
{% endif %}
}
{% endfor %}
return WireResult::Success;
}
DAWN_UNUSED_FUNC({{Return}}{{name}}Serialize);
//* Deserializes `transfer` into `record` getting more serialized data from `buffer` and `size`
//* if needed, using `allocator` to store pointed-to values and `resolver` to translate object
//* Ids to actual objects.
DAWN_DECLARE_UNUSED WireResult {{Return}}{{name}}Deserialize(
{{Return}}{{name}}{{Cmd}}* record,
const volatile {{Return}}{{name}}Transfer* transfer,
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator
{%- if record.may_have_dawn_object -%}
, const ObjectIdResolver& resolver
{%- endif -%}
) {
DAWN_UNUSED(allocator);
{% if is_cmd %}
ASSERT(transfer->commandId == {{Return}}WireCmd::{{name}});
{% endif %}
{% if record.derived_method %}
record->selfId = transfer->self;
{% endif %}
//* Value types are directly in the transfer record, objects being replaced with their IDs.
{% for member in members if member.annotation == "value" %}
{% set memberName = as_varName(member.name) %}
{{deserialize_member(member, "transfer->" + memberName, "record->" + memberName)}}
{% endfor %}
{% if record.extensible %}
record->nextInChain = nullptr;
if (transfer->hasNextInChain) {
WIRE_TRY(DeserializeChainedStruct(&record->nextInChain, deserializeBuffer, allocator, resolver));
}
{% endif %}
{% if record.chained %}
//* Should be set by the root descriptor's call to DeserializeChainedStruct.
//* Don't check |record->chain.next| matches because it is not set until the
//* next iteration inside DeserializeChainedStruct.
ASSERT(record->chain.sType == {{as_cEnum(types["s type"].name, record.name)}});
ASSERT(record->chain.next == nullptr);
{% endif %}
//* Special handling of const char* that have their length embedded directly in the command
{% for member in members if member.length == "strlen" %}
{% set memberName = as_varName(member.name) %}
{% if member.optional %}
bool has_{{memberName}} = transfer->has_{{memberName}};
record->{{memberName}} = nullptr;
if (has_{{memberName}})
{% endif %}
{
uint64_t stringLength64 = transfer->{{memberName}}Strlen;
if (stringLength64 >= std::numeric_limits<size_t>::max()) {
//* Cannot allocate space for the string. It can be at most
//* size_t::max() - 1. We need 1 byte for the null-terminator.
return WireResult::FatalError;
}
size_t stringLength = static_cast<size_t>(stringLength64);
const volatile char* stringInBuffer;
WIRE_TRY(deserializeBuffer->ReadN(stringLength, &stringInBuffer));
char* copiedString;
WIRE_TRY(GetSpace(allocator, stringLength + 1, &copiedString));
//* We can cast away the volatile qualifier because DeserializeBuffer::ReadN already
//* validated that the range [stringInBuffer, stringInBuffer + stringLength) is valid.
//* memcpy may have an unknown access pattern, but this is fine since the string is only
//* data and won't affect control flow of this function.
memcpy(copiedString, const_cast<const char*>(stringInBuffer), stringLength);
copiedString[stringLength] = '\0';
record->{{memberName}} = copiedString;
}
{% endfor %}
//* Get extra buffer data, and copy pointed to values in extra allocated space.
{% for member in members if member.annotation != "value" and member.length != "strlen" %}
{{ assert(member.annotation != "const*const*") }}
{% set memberName = as_varName(member.name) %}
{% if member.type.category != "object" and member.optional %}
//* Non-constant length optional members use length=0 to denote they aren't present.
//* Otherwise we could have length=N and has_member=false, causing reads from an
//* uninitialized pointer.
{{ assert(member.length == "constant") }}
bool has_{{memberName}} = transfer->has_{{memberName}};
record->{{memberName}} = nullptr;
if (has_{{memberName}})
{% endif %}
{
auto memberLength = {{member_length(member, "record->")}};
const volatile {{member_transfer_type(member)}}* memberBuffer;
WIRE_TRY(deserializeBuffer->ReadN(memberLength, &memberBuffer));
//* For data-only members (e.g. "data" in WriteBuffer and WriteTexture), they are
//* not security sensitive so we can directly refer the data inside the transfer
//* buffer in dawn_native. For other members, as prevention of TOCTOU attacks is an
//* important feature of the wire, we must make sure every single value returned to
//* dawn_native must be a copy of what's in the wire.
{% if member.json_data["wire_is_data_only"] %}
record->{{memberName}} =
const_cast<const {{member_transfer_type(member)}}*>(memberBuffer);
{% else %}
{{as_cType(member.type.name)}}* copiedMembers;
WIRE_TRY(GetSpace(allocator, memberLength, &copiedMembers));
record->{{memberName}} = copiedMembers;
{% if member.type.is_wire_transparent %}
//* memcpy is not allowed to copy from volatile objects. However, these
//* arrays are just used as plain data, and don't impact control flow. So if
//* the underlying data were changed while the copy was still executing, we
//* would get different data - but it wouldn't cause unexpected downstream
//* effects.
memcpy(
copiedMembers,
const_cast<const {{member_transfer_type(member)}}*>(memberBuffer),
{{member_transfer_sizeof(member)}} * memberLength);
{% else %}
//* This loop cannot overflow because it iterates up to |memberLength|. Even
//* if memberLength were the maximum integer value, |i| would become equal
//* to it just before exiting the loop, but not increment past or wrap
//* around.
for (decltype(memberLength) i = 0; i < memberLength; ++i) {
{{deserialize_member(member, "memberBuffer[i]", "copiedMembers[i]")}}
}
{% endif %}
{% endif %}
}
{% endfor %}
return WireResult::Success;
}
DAWN_UNUSED_FUNC({{Return}}{{name}}Deserialize);
{% endmacro %}
{% macro write_command_serialization_methods(command, is_return) %}
{% set Return = "Return" if is_return else "" %}
{% set Name = Return + command.name.CamelCase() %}
{% set Cmd = Name + "Cmd" %}
size_t {{Cmd}}::GetRequiredSize() const {
size_t size = WireAlignSizeof<{{Name}}Transfer>() + {{Name}}GetExtraRequiredSize(*this);
return size;
}
{% if command.may_have_dawn_object %}
WireResult {{Cmd}}::Serialize(
size_t commandSize,
SerializeBuffer* buffer,
const ObjectIdProvider& provider
) const {
{{Name}}Transfer* transfer;
WIRE_TRY(buffer->Next(&transfer));
transfer->commandSize = commandSize;
return ({{Name}}Serialize(*this, transfer, buffer, provider));
}
WireResult {{Cmd}}::Serialize(size_t commandSize, SerializeBuffer* buffer) const {
ErrorObjectIdProvider provider;
return Serialize(commandSize, buffer, provider);
}
WireResult {{Cmd}}::Deserialize(
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator,
const ObjectIdResolver& resolver
) {
const volatile {{Name}}Transfer* transfer;
WIRE_TRY(deserializeBuffer->Read(&transfer));
return {{Name}}Deserialize(this, transfer, deserializeBuffer, allocator, resolver);
}
WireResult {{Cmd}}::Deserialize(DeserializeBuffer* deserializeBuffer, DeserializeAllocator* allocator) {
ErrorObjectIdResolver resolver;
return Deserialize(deserializeBuffer, allocator, resolver);
}
{% else %}
WireResult {{Cmd}}::Serialize(size_t commandSize, SerializeBuffer* buffer) const {
{{Name}}Transfer* transfer;
WIRE_TRY(buffer->Next(&transfer));
transfer->commandSize = commandSize;
return ({{Name}}Serialize(*this, transfer, buffer));
}
WireResult {{Cmd}}::Serialize(
size_t commandSize,
SerializeBuffer* buffer,
const ObjectIdProvider&
) const {
return Serialize(commandSize, buffer);
}
WireResult {{Cmd}}::Deserialize(DeserializeBuffer* deserializeBuffer, DeserializeAllocator* allocator) {
const volatile {{Name}}Transfer* transfer;
WIRE_TRY(deserializeBuffer->Read(&transfer));
return {{Name}}Deserialize(this, transfer, deserializeBuffer, allocator);
}
WireResult {{Cmd}}::Deserialize(
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator,
const ObjectIdResolver&
) {
return Deserialize(deserializeBuffer, allocator);
}
{% endif %}
{% endmacro %}
{% macro make_chained_struct_serialization_helpers(out=None) %}
{% set ChainedStructPtr = "WGPUChainedStructOut*" if out else "const WGPUChainedStruct*" %}
{% set ChainedStruct = "WGPUChainedStructOut" if out else "WGPUChainedStruct" %}
size_t GetChainedStructExtraRequiredSize({{ChainedStructPtr}} chainedStruct) {
ASSERT(chainedStruct != nullptr);
size_t result = 0;
while (chainedStruct != nullptr) {
switch (chainedStruct->sType) {
{% for sType in types["s type"].values if (
sType.valid and
(sType.name.CamelCase() not in client_side_structures) and
(types[sType.name.get()].output == out)
) %}
case {{as_cEnum(types["s type"].name, sType.name)}}: {
const auto& typedStruct = *reinterpret_cast<{{as_cType(sType.name)}} const *>(chainedStruct);
result += WireAlignSizeof<{{as_cType(sType.name)}}Transfer>();
result += {{as_cType(sType.name)}}GetExtraRequiredSize(typedStruct);
chainedStruct = typedStruct.chain.next;
break;
}
{% endfor %}
// Explicitly list the Invalid enum. MSVC complains about no case labels.
case WGPUSType_Invalid:
default:
// Invalid enum. Reserve space just for the transfer header (sType and hasNext).
result += WireAlignSizeof<WGPUChainedStructTransfer>();
chainedStruct = chainedStruct->next;
break;
}
}
return result;
}
[[nodiscard]] WireResult SerializeChainedStruct({{ChainedStructPtr}} chainedStruct,
SerializeBuffer* buffer,
const ObjectIdProvider& provider) {
ASSERT(chainedStruct != nullptr);
ASSERT(buffer != nullptr);
do {
switch (chainedStruct->sType) {
{% for sType in types["s type"].values if (
sType.valid and
(sType.name.CamelCase() not in client_side_structures) and
(types[sType.name.get()].output == out)
) %}
{% set CType = as_cType(sType.name) %}
case {{as_cEnum(types["s type"].name, sType.name)}}: {
{{CType}}Transfer* transfer;
WIRE_TRY(buffer->Next(&transfer));
transfer->chain.sType = chainedStruct->sType;
transfer->chain.hasNext = chainedStruct->next != nullptr;
WIRE_TRY({{CType}}Serialize(*reinterpret_cast<{{CType}} const*>(chainedStruct), transfer, buffer
{%- if types[sType.name.get()].may_have_dawn_object -%}
, provider
{%- endif -%}
));
chainedStruct = chainedStruct->next;
} break;
{% endfor %}
// Explicitly list the Invalid enum. MSVC complains about no case labels.
case WGPUSType_Invalid:
default: {
// Invalid enum. Serialize just the transfer header with Invalid as the sType.
// TODO(crbug.com/dawn/369): Unknown sTypes are silently discarded.
if (chainedStruct->sType != WGPUSType_Invalid) {
dawn::WarningLog() << "Unknown sType " << chainedStruct->sType << " discarded.";
}
WGPUChainedStructTransfer* transfer;
WIRE_TRY(buffer->Next(&transfer));
transfer->sType = WGPUSType_Invalid;
transfer->hasNext = chainedStruct->next != nullptr;
// Still move on in case there are valid structs after this.
chainedStruct = chainedStruct->next;
break;
}
}
} while (chainedStruct != nullptr);
return WireResult::Success;
}
WireResult DeserializeChainedStruct({{ChainedStructPtr}}* outChainNext,
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator,
const ObjectIdResolver& resolver) {
bool hasNext;
do {
const volatile WGPUChainedStructTransfer* header;
WIRE_TRY(deserializeBuffer->Peek(&header));
WGPUSType sType = header->sType;
switch (sType) {
{% for sType in types["s type"].values if (
sType.valid and
(sType.name.CamelCase() not in client_side_structures) and
(types[sType.name.get()].output == out)
) %}
{% set CType = as_cType(sType.name) %}
case {{as_cEnum(types["s type"].name, sType.name)}}: {
const volatile {{CType}}Transfer* transfer;
WIRE_TRY(deserializeBuffer->Read(&transfer));
{{CType}}* outStruct;
WIRE_TRY(GetSpace(allocator, 1u, &outStruct));
outStruct->chain.sType = sType;
outStruct->chain.next = nullptr;
*outChainNext = &outStruct->chain;
outChainNext = &outStruct->chain.next;
WIRE_TRY({{CType}}Deserialize(outStruct, transfer, deserializeBuffer, allocator
{%- if types[sType.name.get()].may_have_dawn_object -%}
, resolver
{%- endif -%}
));
hasNext = transfer->chain.hasNext;
} break;
{% endfor %}
// Explicitly list the Invalid enum. MSVC complains about no case labels.
case WGPUSType_Invalid:
default: {
// Invalid enum. Deserialize just the transfer header with Invalid as the sType.
// TODO(crbug.com/dawn/369): Unknown sTypes are silently discarded.
if (sType != WGPUSType_Invalid) {
dawn::WarningLog() << "Unknown sType " << sType << " discarded.";
}
const volatile WGPUChainedStructTransfer* transfer;
WIRE_TRY(deserializeBuffer->Read(&transfer));
{{ChainedStruct}}* outStruct;
WIRE_TRY(GetSpace(allocator, 1u, &outStruct));
outStruct->sType = WGPUSType_Invalid;
outStruct->next = nullptr;
// Still move on in case there are valid structs after this.
*outChainNext = outStruct;
outChainNext = &outStruct->next;
hasNext = transfer->hasNext;
break;
}
}
} while (hasNext);
return WireResult::Success;
}
{% endmacro %}
namespace dawn::wire {
namespace {
// Allocates enough space from allocator to countain T[count] and return it in out.
// Return FatalError if the allocator couldn't allocate the memory.
// Always writes to |out| on success.
template <typename T, typename N>
WireResult GetSpace(DeserializeAllocator* allocator, N count, T** out) {
// Because we use this function extensively when `count` == 1, we can optimize the
// size computations a bit more for those cases via constexpr version of the
// alignment computation.
constexpr size_t kSizeofT = WireAlignSizeof<T>();
size_t size = 0;
if (count == 1) {
size = kSizeofT;
} else {
auto sizeN = WireAlignSizeofN<T>(count);
// A size of 0 indicates an overflow, so return an error.
if (!sizeN) {
return WireResult::FatalError;
}
size = *sizeN;
}
*out = static_cast<T*>(allocator->GetSpace(size));
if (*out == nullptr) {
return WireResult::FatalError;
}
return WireResult::Success;
}
struct WGPUChainedStructTransfer {
WGPUSType sType;
bool hasNext;
};
size_t GetChainedStructExtraRequiredSize(const WGPUChainedStruct* chainedStruct);
[[nodiscard]] WireResult SerializeChainedStruct(const WGPUChainedStruct* chainedStruct,
SerializeBuffer* buffer,
const ObjectIdProvider& provider);
WireResult DeserializeChainedStruct(const WGPUChainedStruct** outChainNext,
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator,
const ObjectIdResolver& resolver);
size_t GetChainedStructExtraRequiredSize(WGPUChainedStructOut* chainedStruct);
[[nodiscard]] WireResult SerializeChainedStruct(WGPUChainedStructOut* chainedStruct,
SerializeBuffer* buffer,
const ObjectIdProvider& provider);
WireResult DeserializeChainedStruct(WGPUChainedStructOut** outChainNext,
DeserializeBuffer* deserializeBuffer,
DeserializeAllocator* allocator,
const ObjectIdResolver& resolver);
//* Output structure [de]serialization first because it is used by commands.
{% for type in by_category["structure"] %}
{% set name = as_cType(type.name) %}
{% if type.name.CamelCase() not in client_side_structures %}
{{write_record_serialization_helpers(type, name, type.members, is_cmd=False)}}
{% endif %}
{% endfor %}
{{ make_chained_struct_serialization_helpers(out=False) }}
{{ make_chained_struct_serialization_helpers(out=True) }}
//* Output [de]serialization helpers for commands
{% for command in cmd_records["command"] %}
{% set name = command.name.CamelCase() %}
{{write_record_serialization_helpers(command, name, command.members, is_cmd=True)}}
{% endfor %}
//* Output [de]serialization helpers for return commands
{% for command in cmd_records["return command"] %}
{% set name = command.name.CamelCase() %}
{{write_record_serialization_helpers(command, name, command.members,
is_cmd=True, is_return_command=True)}}
{% endfor %}
// Implementation of ObjectIdResolver that always errors.
// Used when the generator adds a provider argument because of a chained
// struct, but in practice, a chained struct in that location is invalid.
class ErrorObjectIdResolver final : public ObjectIdResolver {
public:
{% for type in by_category["object"] %}
WireResult GetFromId(ObjectId id, {{as_cType(type.name)}}* out) const override {
return WireResult::FatalError;
}
WireResult GetOptionalFromId(ObjectId id, {{as_cType(type.name)}}* out) const override {
return WireResult::FatalError;
}
{% endfor %}
};
// Implementation of ObjectIdProvider that always errors.
// Used when the generator adds a provider argument because of a chained
// struct, but in practice, a chained struct in that location is invalid.
class ErrorObjectIdProvider final : public ObjectIdProvider {
public:
{% for type in by_category["object"] %}
WireResult GetId({{as_cType(type.name)}} object, ObjectId* out) const override {
return WireResult::FatalError;
}
WireResult GetOptionalId({{as_cType(type.name)}} object, ObjectId* out) const override {
return WireResult::FatalError;
}
{% endfor %}
};
} // anonymous namespace
{% for command in cmd_records["command"] %}
{{ write_command_serialization_methods(command, False) }}
{% endfor %}
{% for command in cmd_records["return command"] %}
{{ write_command_serialization_methods(command, True) }}
{% endfor %}
} // namespace dawn::wire
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