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DebugAllocator: only determine tty config if needed

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Obtaining it is expensive and usually redundent in the case of no leaks.

Notably, between each unit test run the test runner resets the debug
allocator's state, causing this to slow it down by a notable margin.
This commit is contained in:
Kendall Condon 2025-11-03 20:59:52 -05:00
parent 35d55222cf
commit 491c862e6d
1 changed files with 11 additions and 5 deletions
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16
lib/std/heap/debug_allocator.zig
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@ -425,7 +425,7 @@ pub fn DebugAllocator(comptime config: Config) type {
bucket: *BucketHeader,
size_class_index: usize,
used_bits_count: usize,
tty_config: std.Io.tty.Config,
tty_config: *?std.Io.tty.Config,
) usize {
const size_class = @as(usize, 1) << @as(Log2USize, @intCast(size_class_index));
const slot_count = slot_counts[size_class_index];
@ -445,7 +445,10 @@ pub fn DebugAllocator(comptime config: Config) type {
addr,
std.debug.FormatStackTrace{
.stack_trace = stack_trace,
.tty_config = tty_config,
.tty_config = tty_config.* orelse config: {
tty_config.* = std.Io.tty.detectConfig(.stderr());
break :config tty_config.*.?;
},
},
});
leaks += 1;
@ -460,14 +463,14 @@ pub fn DebugAllocator(comptime config: Config) type {
pub fn detectLeaks(self: *Self) usize {
var leaks: usize = 0;
const tty_config = std.Io.tty.detectConfig(.stderr());
var tty_config: ?std.Io.tty.Config = null;
for (self.buckets, 0..) |init_optional_bucket, size_class_index| {
var optional_bucket = init_optional_bucket;
const slot_count = slot_counts[size_class_index];
const used_bits_count = usedBitsCount(slot_count);
while (optional_bucket) |bucket| {
leaks += detectLeaksInBucket(bucket, size_class_index, used_bits_count, tty_config);
leaks += detectLeaksInBucket(bucket, size_class_index, used_bits_count, &tty_config);
optional_bucket = bucket.prev;
}
}
@ -480,7 +483,10 @@ pub fn DebugAllocator(comptime config: Config) type {
@intFromPtr(large_alloc.bytes.ptr),
std.debug.FormatStackTrace{
.stack_trace = stack_trace,
.tty_config = tty_config,
.tty_config = tty_config orelse config: {
tty_config = std.Io.tty.detectConfig(.stderr());
break :config tty_config.?;
},
},
});
leaks += 1;