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Detect truncated DepGraph files #122245

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Merged
merged 1 commit into from
Mar 12, 2024
Merged

Detect truncated DepGraph files #122245

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10 changes: 7 additions & 3 deletions compiler/rustc_query_system/src/dep_graph/serialized.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -179,13 +179,15 @@ impl SerializedDepGraph {
pub fn decode<D: Deps>(d: &mut MemDecoder<'_>) -> SerializedDepGraph {
// The last 16 bytes are the node count and edge count.
debug!("position: {:?}", d.position());
let (node_count, edge_count) =
d.with_position(d.len() - 2 * IntEncodedWithFixedSize::ENCODED_SIZE, |d| {
let (node_count, edge_count, graph_size) =
d.with_position(d.len() - 3 * IntEncodedWithFixedSize::ENCODED_SIZE, |d| {
debug!("position: {:?}", d.position());
let node_count = IntEncodedWithFixedSize::decode(d).0 as usize;
let edge_count = IntEncodedWithFixedSize::decode(d).0 as usize;
(node_count, edge_count)
let graph_size = IntEncodedWithFixedSize::decode(d).0 as usize;
(node_count, edge_count, graph_size)
});
assert_eq!(d.len(), graph_size);
debug!("position: {:?}", d.position());

debug!(?node_count, ?edge_count);
Expand Down Expand Up @@ -491,6 +493,8 @@ impl<D: Deps> EncoderState<D> {
debug!("position: {:?}", encoder.position());
IntEncodedWithFixedSize(node_count).encode(&mut encoder);
IntEncodedWithFixedSize(edge_count).encode(&mut encoder);
let graph_size = encoder.position() + IntEncodedWithFixedSize::ENCODED_SIZE;
IntEncodedWithFixedSize(graph_size as u64).encode(&mut encoder);
debug!("position: {:?}", encoder.position());
// Drop the encoder so that nothing is written after the counts.
let result = encoder.finish();
Expand Down