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111 lines
3.2 KiB
111 lines
3.2 KiB
/**********************************************************************/
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/** Microsoft Windows/NT **/
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/** Copyright(c) Microsoft Corporation, 1998 - 2002 **/
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/**********************************************************************/
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/*
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redblack.h
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Prototypes and node structure definition for red-black binary trees.
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See redblack.c for details and implementation.
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Author: Tom McGuire (tommcg) 1/98
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2/98, modified this version of redblack.h for debug symbol lookups.
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8/98, modified this version of redblack.h for generic name table.
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*/
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#ifndef _REDBLACK_H_
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#define _REDBLACK_H_
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#pragma warning( disable: 4200 ) // zero-sized array in struct/union
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typedef struct _NAME_NODE NAME_NODE, *PNAME_NODE;
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typedef struct _NAME_TREE NAME_TREE, *PNAME_TREE;
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struct _NAME_NODE {
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PNAME_NODE Left;
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PNAME_NODE Right;
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ULONG Hash;
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union {
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ULONG NameLengthAndColorBit;
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struct {
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ULONG NameLength:31;
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ULONG Red:1;
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};
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};
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PVOID Context;
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CHAR Name[ 0 ];
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};
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struct _NAME_TREE {
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PNAME_NODE Root;
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HANDLE SubAllocator;
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};
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#define RBNIL ((PNAME_NODE)&NameRbEmptyNode)
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extern const NAME_NODE NameRbEmptyNode;
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//
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// Although "Red" can be stored in its own 1-byte or 4-byte field, keeping the
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// nodes smaller by encoding "Red" as a one-bit field with another value
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// provides better performance (more nodes tend to stay in the cache). To
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// provide flexibility in storage of the RED property, all references to RED
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// and BLACK are made through the following macros which can be changed as
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// necessary:
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//
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#define IS_RED( Node ) ( (Node)->Red )
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#define IS_BLACK( Node ) ( ! (Node)->Red )
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#define MARK_RED( Node ) ( (Node)->Red = 1 )
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#define MARK_BLACK( Node ) ( (Node)->Red = 0 )
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//
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// The maximum tree depth is 2*Lg(N). Since we could never have more than
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// 2^X nodes with X-bit pointers, we can safely say the absolute maximum
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// depth will be 2*Lg(2^X) which is 2*X. The size of a pointer in bits is
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// its size in bytes times 8 bits, so 2*(sizeof(p)*8) is our maximum depth.
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// So for 32-bit pointers, our maximum depth is 64.
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//
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// If you know the maximum possible number of nodes in advance (like the size
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// of the address space divided by the size of a node), you can tweak this
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// value a bit smaller to 2*Lg(N). Note that it's important for this max
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// depth be evalutated to a constant value at compile time.
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//
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// For this implementation, we'll assume the maximum number of nodes is
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// 1 million, so the max depth is 40 (2*Lg(2^20)). Note that no runtime
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// checks are made to ensure we don't exceed this number.
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//
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#define MAX_DEPTH 40
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//
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// The following prototypes are the red-black tree interface.
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//
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VOID
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NameRbInitTree(
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IN OUT PNAME_TREE Tree,
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IN HANDLE SubAllocator
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);
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PNAME_NODE
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NameRbInsert(
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IN OUT PNAME_TREE Tree,
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IN LPCSTR Name
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);
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PNAME_NODE
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NameRbFind(
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IN PNAME_TREE Tree,
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IN LPCSTR Name
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);
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#endif // _REDBLACK_H_
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