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Add asserts to ensure block heights are not too large.

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This commit is contained in:
Age Manning
2019-02-20 12:36:54 +11:00
parent d8584cbed2
commit 2fbdc53147
2 changed files with 8 additions and 2 deletions
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8
eth2/fork_choice/src/bitwise_lmd_ghost.rs
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@@ -19,7 +19,7 @@ use types::{
//TODO: Pruning - Children
//TODO: Handle Syncing
/// The optimised LMD-GHOST fork choice rule.
/// The optimised bitwise LMD-GHOST fork choice rule.
/// NOTE: This uses u32 to represent difference between block heights. Thus this is only
/// applicable for block height differences in the range of a u32.
/// This can potentially be parallelized in some parts.
@@ -30,6 +30,10 @@ fn log2_int(x: u32) -> u32 {
if x == 0 {
return 0;
}
assert!(
x <= std::f32::MAX as u32,
"Height too large for fast log in bitwise fork choice"
);
log2_raw(x as f32) as u32
}
@@ -37,7 +41,7 @@ fn power_of_2_below(x: u32) -> u32 {
2u32.pow(log2_int(x))
}
/// Stores the necessary data structures to run the optimised lmd ghost algorithm.
/// Stores the necessary data structures to run the optimised bitwise lmd ghost algorithm.
pub struct BitwiseLMDGhost<T: ClientDB + Sized> {
/// A cache of known ancestors at given heights for a specific block.
//TODO: Consider FnvHashMap