|
|
|
|
#include "rust/cpp_kernel/map.h"
|
|
|
|
|
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
#include <cstddef>
|
|
|
|
|
#include <cstdint>
|
|
|
|
|
#include <string>
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
#include <type_traits>
|
|
|
|
|
#include <utility>
|
|
|
|
|
|
|
|
|
|
#include "absl/log/absl_log.h"
|
|
|
|
|
#include "google/protobuf/map.h"
|
|
|
|
|
#include "google/protobuf/message.h"
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
#include "google/protobuf/message_lite.h"
|
|
|
|
|
#include "rust/cpp_kernel/strings.h"
|
|
|
|
|
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
namespace google {
|
|
|
|
|
namespace protobuf {
|
|
|
|
|
namespace rust {
|
|
|
|
|
namespace {
|
|
|
|
|
|
|
|
|
|
template <typename T>
|
|
|
|
|
struct FromViewType {
|
|
|
|
|
using type = T;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
template <>
|
|
|
|
|
struct FromViewType<PtrAndLen> {
|
|
|
|
|
using type = std::string;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
using KeyMap = internal::KeyMapBase<
|
|
|
|
|
internal::KeyForBase<typename FromViewType<Key>::type>>;
|
|
|
|
|
|
|
|
|
|
internal::MapNodeSizeInfoT GetSizeInfo(size_t key_size,
|
|
|
|
|
const google::protobuf::MessageLite* value) {
|
|
|
|
|
// Each map node consists of a NodeBase followed by a std::pair<Key, Value>.
|
|
|
|
|
// We need to compute the offset of the value and the total size of the node.
|
|
|
|
|
size_t node_and_key_size = sizeof(internal::NodeBase) + key_size;
|
|
|
|
|
uint16_t value_size;
|
|
|
|
|
uint8_t value_alignment;
|
|
|
|
|
internal::RustMapHelper::GetSizeAndAlignment(value, &value_size,
|
|
|
|
|
&value_alignment);
|
|
|
|
|
// Round node_and_key_size up to the nearest multiple of value_alignment.
|
|
|
|
|
uint16_t offset =
|
|
|
|
|
(((node_and_key_size - 1) / value_alignment) + 1) * value_alignment;
|
|
|
|
|
return internal::RustMapHelper::MakeSizeInfo(offset + value_size, offset);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
internal::MapNodeSizeInfoT GetSizeInfo(const google::protobuf::MessageLite* value) {
|
|
|
|
|
return GetSizeInfo(sizeof(Key), value);
|
|
|
|
|
}
|
|
|
|
|
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
template <typename Key>
|
|
|
|
|
void DestroyMapNode(internal::UntypedMapBase* m, internal::NodeBase* node,
|
|
|
|
|
internal::MapNodeSizeInfoT size_info) {
|
|
|
|
|
if constexpr (std::is_same<Key, PtrAndLen>::value) {
|
|
|
|
|
static_cast<std::string*>(node->GetVoidKey())->~basic_string();
|
|
|
|
|
}
|
|
|
|
|
internal::RustMapHelper::DestroyMessage(
|
|
|
|
|
static_cast<MessageLite*>(node->GetVoidValue(size_info)));
|
|
|
|
|
internal::RustMapHelper::DeallocNode(m, node, size_info);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
bool Insert(internal::UntypedMapBase* m, Key key, MessageLite* value) {
|
|
|
|
|
internal::MapNodeSizeInfoT size_info =
|
|
|
|
|
GetSizeInfo<typename FromViewType<Key>::type>(value);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
internal::NodeBase* node = internal::RustMapHelper::AllocNode(m, size_info);
|
|
|
|
|
if constexpr (std::is_same<Key, PtrAndLen>::value) {
|
|
|
|
|
new (node->GetVoidKey()) std::string(key.ptr, key.len);
|
|
|
|
|
} else {
|
|
|
|
|
*static_cast<Key*>(node->GetVoidKey()) = key;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
MessageLite* new_msg = internal::RustMapHelper::PlacementNew(
|
|
|
|
|
value, node->GetVoidValue(size_info));
|
|
|
|
|
auto* full_msg = DynamicCastMessage<Message>(new_msg);
|
|
|
|
|
|
|
|
|
|
// If we are working with a full (non-lite) proto, we reflectively swap the
|
|
|
|
|
// value into place. Otherwise, we have to perform a copy.
|
|
|
|
|
if (full_msg != nullptr) {
|
|
|
|
|
full_msg->GetReflection()->Swap(full_msg,
|
|
|
|
|
DynamicCastMessage<Message>(value));
|
|
|
|
|
} else {
|
|
|
|
|
new_msg->CheckTypeAndMergeFrom(*value);
|
|
|
|
|
}
|
|
|
|
|
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
node = internal::RustMapHelper::InsertOrReplaceNode(
|
|
|
|
|
static_cast<KeyMap<Key>*>(m), node);
|
|
|
|
|
if (node == nullptr) {
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
DestroyMapNode<Key>(m, node, size_info);
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Map, typename Key,
|
|
|
|
|
typename = typename std::enable_if<
|
|
|
|
|
!std::is_same<Key, google::protobuf::rust::PtrAndLen>::value>::type>
|
|
|
|
|
internal::RustMapHelper::NodeAndBucket FindHelper(Map* m, Key key) {
|
|
|
|
|
return internal::RustMapHelper::FindHelper(
|
|
|
|
|
m, static_cast<internal::KeyForBase<Key>>(key));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Map>
|
|
|
|
|
internal::RustMapHelper::NodeAndBucket FindHelper(Map* m,
|
|
|
|
|
google::protobuf::rust::PtrAndLen key) {
|
|
|
|
|
return internal::RustMapHelper::FindHelper(
|
|
|
|
|
m, absl::string_view(key.ptr, key.len));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
bool Get(internal::UntypedMapBase* m, const google::protobuf::MessageLite* prototype,
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
Key key, MessageLite** value) {
|
|
|
|
|
internal::MapNodeSizeInfoT size_info =
|
|
|
|
|
GetSizeInfo<typename FromViewType<Key>::type>(prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
auto* map_base = static_cast<KeyMap<Key>*>(m);
|
|
|
|
|
internal::RustMapHelper::NodeAndBucket result = FindHelper(map_base, key);
|
|
|
|
|
if (result.node == nullptr) {
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
*value = static_cast<MessageLite*>(result.node->GetVoidValue(size_info));
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
bool Remove(internal::UntypedMapBase* m, const google::protobuf::MessageLite* prototype,
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
Key key) {
|
|
|
|
|
internal::MapNodeSizeInfoT size_info =
|
|
|
|
|
GetSizeInfo<typename FromViewType<Key>::type>(prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
auto* map_base = static_cast<KeyMap<Key>*>(m);
|
|
|
|
|
internal::RustMapHelper::NodeAndBucket result = FindHelper(map_base, key);
|
|
|
|
|
if (result.node == nullptr) {
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
internal::RustMapHelper::EraseNoDestroy(map_base, result.bucket, result.node);
|
|
|
|
|
DestroyMapNode<Key>(m, result.node, size_info);
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <typename Key>
|
|
|
|
|
void IterGet(const internal::UntypedMapIterator* iter,
|
|
|
|
|
const google::protobuf::MessageLite* prototype, Key* key,
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
MessageLite** value) {
|
|
|
|
|
internal::MapNodeSizeInfoT size_info =
|
|
|
|
|
GetSizeInfo<typename FromViewType<Key>::type>(prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
internal::NodeBase* node = iter->node_;
|
|
|
|
|
if constexpr (std::is_same<Key, PtrAndLen>::value) {
|
|
|
|
|
const std::string* s = static_cast<const std::string*>(node->GetVoidKey());
|
|
|
|
|
*key = PtrAndLen{s->data(), s->size()};
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
} else {
|
|
|
|
|
*key = *static_cast<const Key*>(node->GetVoidKey());
|
|
|
|
|
}
|
|
|
|
|
*value = static_cast<MessageLite*>(node->GetVoidValue(size_info));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// LINT.IfChange(map_key_category)
|
|
|
|
|
enum class MapKeyCategory : uint8_t {
|
|
|
|
|
kOneByte = 0,
|
|
|
|
|
kFourBytes = 1,
|
|
|
|
|
kEightBytes = 2,
|
|
|
|
|
kStdString = 3,
|
|
|
|
|
};
|
|
|
|
|
// LINT.ThenChange(//depot/google3/third_party/protobuf/rust/cpp.rs:map_key_category)
|
|
|
|
|
|
|
|
|
|
size_t KeySize(MapKeyCategory category) {
|
|
|
|
|
switch (category) {
|
|
|
|
|
case MapKeyCategory::kOneByte:
|
|
|
|
|
return 1;
|
|
|
|
|
case MapKeyCategory::kFourBytes:
|
|
|
|
|
return 4;
|
|
|
|
|
case MapKeyCategory::kEightBytes:
|
|
|
|
|
return 8;
|
|
|
|
|
case MapKeyCategory::kStdString:
|
|
|
|
|
return sizeof(std::string);
|
|
|
|
|
default:
|
|
|
|
|
ABSL_DLOG(FATAL) << "Unexpected value of MapKeyCategory enum";
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void ClearMap(internal::UntypedMapBase* m, MapKeyCategory category,
|
|
|
|
|
bool reset_table, const google::protobuf::MessageLite* prototype) {
|
|
|
|
|
internal::MapNodeSizeInfoT size_info =
|
|
|
|
|
GetSizeInfo(KeySize(category), prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
if (internal::RustMapHelper::IsGlobalEmptyTable(m)) return;
|
|
|
|
|
uint8_t bits = internal::RustMapHelper::kValueIsProto;
|
|
|
|
|
if (category == MapKeyCategory::kStdString) {
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
bits |= internal::RustMapHelper::kKeyIsString;
|
|
|
|
|
}
|
|
|
|
|
internal::RustMapHelper::ClearTable(
|
|
|
|
|
m, internal::RustMapHelper::ClearInput{size_info, bits, reset_table,
|
|
|
|
|
/* destroy_node = */ nullptr});
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // namespace
|
|
|
|
|
} // namespace rust
|
|
|
|
|
} // namespace protobuf
|
|
|
|
|
} // namespace google
|
|
|
|
|
|
|
|
|
|
extern "C" {
|
|
|
|
|
|
|
|
|
|
void proto2_rust_thunk_UntypedMapIterator_increment(
|
|
|
|
|
google::protobuf::internal::UntypedMapIterator* iter) {
|
|
|
|
|
iter->PlusPlus();
|
|
|
|
|
}
|
|
|
|
|
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
google::protobuf::internal::UntypedMapBase* proto2_rust_map_new() {
|
|
|
|
|
return new google::protobuf::internal::UntypedMapBase(/* arena = */ nullptr);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void proto2_rust_map_free(google::protobuf::internal::UntypedMapBase* m,
|
|
|
|
|
google::protobuf::rust::MapKeyCategory category,
|
|
|
|
|
const google::protobuf::MessageLite* prototype) {
|
|
|
|
|
google::protobuf::rust::ClearMap(m, category, /* reset_table = */ false, prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
delete m;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void proto2_rust_map_clear(google::protobuf::internal::UntypedMapBase* m,
|
|
|
|
|
google::protobuf::rust::MapKeyCategory category,
|
|
|
|
|
const google::protobuf::MessageLite* prototype) {
|
|
|
|
|
google::protobuf::rust::ClearMap(m, category, /* reset_table = */ true, prototype);
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
}
|
|
|
|
|
|
|
|
|
|
size_t proto2_rust_map_size(google::protobuf::internal::UntypedMapBase* m) {
|
|
|
|
|
return m->size();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
google::protobuf::internal::UntypedMapIterator proto2_rust_map_iter(
|
|
|
|
|
google::protobuf::internal::UntypedMapBase* m) {
|
|
|
|
|
return m->begin();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#define DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(cpp_type, suffix) \
|
|
|
|
|
bool proto2_rust_map_insert_##suffix(google::protobuf::internal::UntypedMapBase* m, \
|
|
|
|
|
cpp_type key, \
|
|
|
|
|
google::protobuf::MessageLite* value) { \
|
|
|
|
|
return google::protobuf::rust::Insert(m, key, value); \
|
|
|
|
|
} \
|
|
|
|
|
\
|
|
|
|
|
bool proto2_rust_map_get_##suffix(google::protobuf::internal::UntypedMapBase* m, \
|
|
|
|
|
const google::protobuf::MessageLite* prototype, \
|
|
|
|
|
cpp_type key, \
|
|
|
|
|
google::protobuf::MessageLite** value) { \
|
|
|
|
|
return google::protobuf::rust::Get(m, prototype, key, value); \
|
|
|
|
|
} \
|
|
|
|
|
\
|
|
|
|
|
bool proto2_rust_map_remove_##suffix(google::protobuf::internal::UntypedMapBase* m, \
|
|
|
|
|
const google::protobuf::MessageLite* prototype, \
|
|
|
|
|
cpp_type key) { \
|
|
|
|
|
return google::protobuf::rust::Remove(m, prototype, key); \
|
|
|
|
|
} \
|
|
|
|
|
\
|
|
|
|
|
void proto2_rust_map_iter_get_##suffix( \
|
|
|
|
|
const google::protobuf::internal::UntypedMapIterator* iter, \
|
|
|
|
|
const google::protobuf::MessageLite* prototype, cpp_type* key, \
|
|
|
|
|
google::protobuf::MessageLite** value) { \
|
|
|
|
|
return google::protobuf::rust::IterGet(iter, prototype, key, value); \
|
Rust: cut down on the amount of generated C++ code needed for maps
With the C++ kernel for Rust, we currently need to generate quite a few C++
thunks for operations on map fields. For each message we generate, we generate
these thunks for all possible map types that could have that message as a
value. These operations are for things such as insertion, removal, clearing,
iterating, etc.
The reason we do this is that templated types don't play well with FFI, so we
effectively need separate FFI endpoints for every possible combination of key
and value types used (or even potentially used) as a map field.
This CL fixes the problem by replacing the generated thunks with functions in
the runtime that can operate on `proto2::MessageLite*` without needing to care
about the specific message type.
The way it works is that we implement the operations using either
`UntypedMapBase` (the base class of all map types, which knows nothing about
the key and value types) or `KeyMapBase`, which knows the key type but not the
value type. I roughly followed the example of the table-driven parser, which
has a similar problem of needing to operate generically on maps without having
access to the concrete types.
I removed 54 thunks per message (that's 6 key types times 9 operations per
key), but had to add two new thunks per message:
- The `size_info` thunk looks up the `MapNodeSizeInfoT`, which is stored in a
small constant table. The important thing here is an offset indicating where
to look for the value in each map entry. This offset can be different for
every pair of key and value types, but we can safely assume that the result
does not depend on the signedness of the key. As a result we only need to
store four entries per message: one each for i32, i64, bool, and string.
- The `placement_new` thunk move-constructs a message in place. We need this
to be able to efficiently implement map insertion.
There are two big things that this CL does not address yet but which I plan to
follow up on:
- Enums still generate many map-related C++ thunks that could be replaced with
a common implementation. This should actually be much easier to handle than
messages, because every enum has the same representation as an i32.
- We still generate six `ProxiedInMapValue` implementations for every message,
but it should be possible to replace these with a blanket implementation that
works for all message types.
PiperOrigin-RevId: 657681421
4 months ago
|
|
|
}
|
|
|
|
|
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(int32_t, i32)
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(uint32_t, u32)
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(int64_t, i64)
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(uint64_t, u64)
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(bool, bool)
|
|
|
|
|
DEFINE_KEY_SPECIFIC_MAP_OPERATIONS(google::protobuf::rust::PtrAndLen, ProtoString)
|
|
|
|
|
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(int32_t, i32, int32_t,
|
|
|
|
|
int32_t, value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(uint32_t, u32, uint32_t,
|
|
|
|
|
uint32_t, value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(float, f32, float, float,
|
|
|
|
|
value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(double, f64, double, double,
|
|
|
|
|
value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(bool, bool, bool, bool,
|
|
|
|
|
value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(uint64_t, u64, uint64_t,
|
|
|
|
|
uint64_t, value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(int64_t, i64, int64_t,
|
|
|
|
|
int64_t, value, cpp_value);
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(
|
|
|
|
|
std::string, ProtoBytes, google::protobuf::rust::PtrAndLen, std::string*,
|
|
|
|
|
std::move(*value),
|
|
|
|
|
(google::protobuf::rust::PtrAndLen{cpp_value.data(), cpp_value.size()}));
|
|
|
|
|
__PB_RUST_EXPOSE_SCALAR_MAP_METHODS_FOR_VALUE_TYPE(
|
|
|
|
|
std::string, ProtoString, google::protobuf::rust::PtrAndLen, std::string*,
|
|
|
|
|
std::move(*value),
|
|
|
|
|
(google::protobuf::rust::PtrAndLen{cpp_value.data(), cpp_value.size()}));
|
|
|
|
|
|
|
|
|
|
} // extern "C"
|
