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// Copyright 2009 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.
// Free(v) must be able to determine the MSpan containing v.
// The MHeapMap is a 2-level radix tree mapping page numbers to MSpans.
typedef struct MHeapMapNode2 MHeapMapNode2;
enum
{
// 32 bit address - 12 bit page size = 20 bits to map
MHeapMap_Level1Bits = 10,
MHeapMap_Level2Bits = 10,
MHeapMap_TotalBits =
MHeapMap_Level1Bits +
MHeapMap_Level2Bits,
MHeapMap_Level1Mask = (1<<MHeapMap_Level1Bits) - 1,
MHeapMap_Level2Mask = (1<<MHeapMap_Level2Bits) - 1,
};
struct MHeapMap
{
void *(*allocator)(uintptr);
MHeapMapNode2 *p[1<<MHeapMap_Level1Bits];
};
struct MHeapMapNode2
{
MSpan *s[1<<MHeapMap_Level2Bits];
};
void runtime_MHeapMap_Init(MHeapMap *m, void *(*allocator)(uintptr));
bool runtime_MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr npages);
MSpan* runtime_MHeapMap_Get(MHeapMap *m, PageID k);
MSpan* runtime_MHeapMap_GetMaybe(MHeapMap *m, PageID k);
void runtime_MHeapMap_Set(MHeapMap *m, PageID k, MSpan *v);
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