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|
use std::collections::HashMap;
use std::collections::HashSet;
use crate::descriptor::field_descriptor_proto::Label;
use crate::descriptor::FileDescriptorProto;
use crate::reflect::field::index::FieldIndex;
use crate::reflect::field::index::ForwardProtobufFieldType;
use crate::reflect::field::index::ForwardProtobufTypeBox;
use crate::reflect::file::index::MessageIndices;
use crate::reflect::MessageDescriptor;
use crate::reflect::RuntimeType;
use crate::reflect::Syntax;
pub(crate) fn compute_is_initialized_is_always_true(
messages: &mut [MessageIndices],
file_fields: &[FieldIndex],
file: &FileDescriptorProto,
) {
for message in messages.iter_mut() {
message.is_initialized_is_always_true =
is_initialized_is_always_true_ignoring_deps(message, file);
}
// Map from a message to messages who include it. E.g. for:
// ```
// 0: message A {}
// 1: message B { A a = 10; }
// ```
// This map will contain: `{0: [1]}`
let mut rdeps: HashMap<usize, Vec<usize>> = HashMap::new();
for i in 0..messages.len() {
let message = &mut messages[i];
if !message.is_initialized_is_always_true {
continue;
}
let mut is_initialized_is_always_true = true;
for ft in message_field_messages(message, file_fields) {
match ft {
MessageType::ThisFile(j) => {
rdeps.entry(j).or_default().push(i);
}
MessageType::OtherFile(m) => {
if !m.is_initialized_is_always_true() {
is_initialized_is_always_true = false;
}
}
}
}
message.is_initialized_is_always_true = is_initialized_is_always_true;
}
let mut invalidated: HashSet<usize> = HashSet::new();
let mut invalidate_stack: Vec<usize> = Vec::new();
for i in 0..messages.len() {
let message = &messages[i];
if message.is_initialized_is_always_true {
continue;
}
invalidate_stack.push(i);
}
while let Some(i) = invalidate_stack.pop() {
if !invalidated.insert(i) {
continue;
}
messages[i].is_initialized_is_always_true = false;
let next = rdeps.get(&i).map(|v| v.as_slice()).unwrap_or_default();
for next in next {
invalidate_stack.push(*next);
}
}
}
enum MessageType<'m> {
ThisFile(usize),
OtherFile(&'m MessageDescriptor),
}
fn message_field_messages<'a>(
message: &'a MessageIndices,
file_fields: &'a [FieldIndex],
) -> impl Iterator<Item = MessageType<'a>> + 'a {
message_field_types(message, file_fields).filter_map(|f| match f {
ForwardProtobufTypeBox::ProtobufTypeBox(t) => match t.runtime() {
RuntimeType::Message(m) => Some(MessageType::OtherFile(m)),
_ => None,
},
ForwardProtobufTypeBox::CurrentFileEnum(_) => None,
ForwardProtobufTypeBox::CurrentFileMessage(i) => Some(MessageType::ThisFile(*i)),
})
}
fn message_field_types<'a>(
message: &'a MessageIndices,
file_fields: &'a [FieldIndex],
) -> impl Iterator<Item = &'a ForwardProtobufTypeBox> {
enum Either<A, B> {
Left(A),
Right(B),
}
impl<T, A: Iterator<Item = T>, B: Iterator<Item = T>> Iterator for Either<A, B> {
type Item = T;
fn next(&mut self) -> Option<T> {
match self {
Either::Left(a) => a.next(),
Either::Right(b) => b.next(),
}
}
}
message
.message_index
.slice_fields(file_fields)
.iter()
.flat_map(|f| match &f.field_type {
ForwardProtobufFieldType::Singular(t) => Either::Left([t].into_iter()),
ForwardProtobufFieldType::Repeated(t) => Either::Left([t].into_iter()),
ForwardProtobufFieldType::Map(k, v) => Either::Right([k, v].into_iter()),
})
}
fn is_initialized_is_always_true_ignoring_deps(
message: &MessageIndices,
file: &FileDescriptorProto,
) -> bool {
// Shortcut.
if Syntax::of_file(file) == Syntax::Proto3 {
return true;
}
// We don't support extensions properly but if we did,
// extensions should have been checked for `is_initialized`.
if !message.proto.extension_range.is_empty() {
return false;
}
for field in &message.proto.field {
if field.label() == Label::LABEL_REQUIRED {
return false;
}
}
true
}
|
