1 files changed, 71 insertions, 0 deletions
diff --git a/src/runtime/mem_darwin.go b/src/runtime/mem_darwin.go
new file mode 100644
index 0000000..7fccd2b
--- /dev/null
+++ b/src/runtime/mem_darwin.go
@@ -0,0 +1,71 @@
+// Copyright 2018 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 runtime
+
+import (
+	"unsafe"
+)
+
+// Don't split the stack as this function may be invoked without a valid G,
+// which prevents us from allocating more stack.
+//go:nosplit
+func sysAlloc(n uintptr, sysStat *sysMemStat) unsafe.Pointer {
+	v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
+	if err != 0 {
+		return nil
+	}
+	sysStat.add(int64(n))
+	return v
+}
+
+func sysUnused(v unsafe.Pointer, n uintptr) {
+	// MADV_FREE_REUSABLE is like MADV_FREE except it also propagates
+	// accounting information about the process to task_info.
+	madvise(v, n, _MADV_FREE_REUSABLE)
+}
+
+func sysUsed(v unsafe.Pointer, n uintptr) {
+	// MADV_FREE_REUSE is necessary to keep the kernel's accounting
+	// accurate. If called on any memory region that hasn't been
+	// MADV_FREE_REUSABLE'd, it's a no-op.
+	madvise(v, n, _MADV_FREE_REUSE)
+}
+
+func sysHugePage(v unsafe.Pointer, n uintptr) {
+}
+
+// Don't split the stack as this function may be invoked without a valid G,
+// which prevents us from allocating more stack.
+//go:nosplit
+func sysFree(v unsafe.Pointer, n uintptr, sysStat *sysMemStat) {
+	sysStat.add(-int64(n))
+	munmap(v, n)
+}
+
+func sysFault(v unsafe.Pointer, n uintptr) {
+	mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
+}
+
+func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer {
+	p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
+	if err != 0 {
+		return nil
+	}
+	return p
+}
+
+const _ENOMEM = 12
+
+func sysMap(v unsafe.Pointer, n uintptr, sysStat *sysMemStat) {
+	sysStat.add(int64(n))
+
+	p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
+	if err == _ENOMEM {
+		throw("runtime: out of memory")
+	}
+	if p != v || err != 0 {
+		throw("runtime: cannot map pages in arena address space")
+	}
+}