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std.heap.GeneralPurposeAllocator: add never_unmap config option

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This is a temporary debugging trick you can use to turn segfaults into more helpful
logged error messages with stack trace details. The downside is that every allocation
will be leaked!
This commit is contained in:
Andrew Kelley 2020-08-18 15:09:48 -07:00
parent 5547abd2d1
commit 583b843803
1 changed files with 8 additions and 1 deletions
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9
lib/std/heap/general_purpose_allocator.zig
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@ -142,6 +142,11 @@ pub const Config = struct {
/// Whether the allocator may be used simultaneously from multiple threads.
thread_safe: bool = !std.builtin.single_threaded,
/// This is a temporary debugging trick you can use to turn segfaults into more helpful
/// logged error messages with stack trace details. The downside is that every allocation
/// will be leaked!
never_unmap: bool = false,
};
pub fn GeneralPurposeAllocator(comptime config: Config) type {
@ -416,7 +421,9 @@ pub fn GeneralPurposeAllocator(comptime config: Config) type {
bucket.prev.next = bucket.next;
self.buckets[bucket_index] = bucket.prev;
}
self.backing_allocator.free(bucket.page[0..page_size]);
if (!config.never_unmap) {
self.backing_allocator.free(bucket.page[0..page_size]);
}
const bucket_size = bucketSize(size_class);
const bucket_slice = @ptrCast([*]align(@alignOf(BucketHeader)) u8, bucket)[0..bucket_size];
self.backing_allocator.free(bucket_slice);