1 files changed, 29 insertions, 0 deletions
diff --git a/src/internal/coverage/calloc/batchcounteralloc.go b/src/internal/coverage/calloc/batchcounteralloc.go
new file mode 100644
index 0000000..2b6495d
--- /dev/null
+++ b/src/internal/coverage/calloc/batchcounteralloc.go
@@ -0,0 +1,29 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package calloc
+
+// This package contains a simple "batch" allocator for allocating
+// coverage counters (slices of uint32 basically), for working with
+// coverage data files. Collections of counter arrays tend to all be
+// live/dead over the same time period, so a good fit for batch
+// allocation.
+
+type BatchCounterAlloc struct {
+	pool []uint32
+}
+
+func (ca *BatchCounterAlloc) AllocateCounters(n int) []uint32 {
+	const chunk = 8192
+	if n > cap(ca.pool) {
+		siz := chunk
+		if n > chunk {
+			siz = n
+		}
+		ca.pool = make([]uint32, siz)
+	}
+	rv := ca.pool[:n]
+	ca.pool = ca.pool[n:]
+	return rv
+}