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InternPool: fix crash in rehashTrackedInsts

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When a shard has zero elements, we don't need to reserve any capacity.
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mlugg 2024-12-08 10:52:45 +00:00
parent bd0ace5c4e
commit 135c733eef
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1 changed files with 3 additions and 1 deletions
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src/InternPool.zig
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@ -314,7 +314,9 @@ pub fn rehashTrackedInsts(
// We know how big each shard must be, so ensure we have the capacity we need.
for (ip.shards) |*shard| {
const want_capacity = std.math.ceilPowerOfTwo(u32, shard.mutate.tracked_inst_map.len * 5 / 3) catch unreachable;
const want_capacity = if (shard.mutate.tracked_inst_map.len == 0) 0 else cap: {
break :cap std.math.ceilPowerOfTwo(u32, shard.mutate.tracked_inst_map.len * 5 / 3) catch unreachable;
};
const have_capacity = shard.shared.tracked_inst_map.header().capacity; // no acquire because we hold the mutex
if (have_capacity >= want_capacity) {
@memset(shard.shared.tracked_inst_map.entries[0..have_capacity], .{ .value = .none, .hash = undefined });