[f450f2f] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // string_res -- variable-length, mutable run of text, with resource semantics |
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| 8 | // |
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| 9 | // Author : Michael L. Brooks |
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| 10 | // Created On : Fri Sep 03 11:00:00 2021 |
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[7d25f44] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Thu Jun 29 09:29:06 2023 |
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| 13 | // Update Count : 2 |
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[f450f2f] | 14 | // |
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| 15 | |
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| 16 | #include "string_res.hfa" |
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[0f781fb8] | 17 | #include "string_sharectx.hfa" |
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[08ed947] | 18 | #include "stdlib.hfa" |
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| 19 | |
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| 20 | // Workaround for observed performance penalty from calling CFA's alloc. |
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| 21 | // Workaround is: EndVbyte = TEMP_ALLOC(char, CurrSize) |
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| 22 | // Should be: EndVbyte = alloc(CurrSize) |
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| 23 | #define TEMP_ALLOC(T, n) (( T* ) malloc( n * sizeof( T ) )) |
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[0f781fb8] | 24 | |
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[218096f] | 25 | #include <assert.h> |
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[f450f2f] | 26 | |
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| 27 | //######################### VbyteHeap "header" ######################### |
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| 28 | |
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| 29 | #ifdef VbyteDebug |
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[6cc87c0] | 30 | HandleNode *HeaderPtr; |
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[f450f2f] | 31 | #endif // VbyteDebug |
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| 32 | |
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| 33 | struct VbyteHeap { |
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| 34 | |
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| 35 | int NoOfCompactions; // number of compactions of the byte area |
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| 36 | int NoOfExtensions; // number of extensions in the size of the byte area |
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| 37 | int NoOfReductions; // number of reductions in the size of the byte area |
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| 38 | |
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| 39 | int InitSize; // initial number of bytes in the byte-string area |
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| 40 | int CurrSize; // current number of bytes in the byte-string area |
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| 41 | char *StartVbyte; // pointer to the `st byte of the start of the byte-string area |
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| 42 | char *EndVbyte; // pointer to the next byte after the end of the currently used portion of byte-string area |
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| 43 | void *ExtVbyte; // pointer to the next byte after the end of the byte-string area |
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| 44 | |
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| 45 | HandleNode Header; // header node for handle list |
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| 46 | }; // VbyteHeap |
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| 47 | |
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| 48 | |
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[4e8df745] | 49 | static void compaction( VbyteHeap & ); // compaction of the byte area |
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| 50 | static void garbage( VbyteHeap &, int ); // garbage collect the byte area |
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| 51 | static void extend( VbyteHeap &, int ); // extend the size of the byte area |
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| 52 | static void reduce( VbyteHeap &, int ); // reduce the size of the byte area |
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[f450f2f] | 53 | |
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[4e8df745] | 54 | static void ?{}( VbyteHeap &, size_t = 1000 ); |
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| 55 | static void ^?{}( VbyteHeap & ); |
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[94647b0b] | 56 | |
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[4e8df745] | 57 | static int ByteCmp( char *, int, int, char *, int, int ); // compare 2 blocks of bytes |
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| 58 | static char *VbyteAlloc( VbyteHeap &, int ); // allocate a block bytes in the heap |
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| 59 | static char *VbyteTryAdjustLast( VbyteHeap &, int ); |
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[f450f2f] | 60 | |
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[4e8df745] | 61 | static void AddThisAfter( HandleNode &, HandleNode & ); |
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| 62 | static void DeleteNode( HandleNode & ); |
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| 63 | static void MoveThisAfter( HandleNode &, const HandleNode & ); // move current handle after parameter handle |
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[f450f2f] | 64 | |
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| 65 | |
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| 66 | // Allocate the storage for the variable sized area and intialize the heap variables. |
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| 67 | |
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[4e8df745] | 68 | static void ?{}( VbyteHeap & this, size_t Size ) with(this) { |
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[f450f2f] | 69 | #ifdef VbyteDebug |
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| 70 | serr | "enter:VbyteHeap::VbyteHeap, this:" | &this | " Size:" | Size; |
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| 71 | #endif // VbyteDebug |
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| 72 | NoOfCompactions = NoOfExtensions = NoOfReductions = 0; |
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| 73 | InitSize = CurrSize = Size; |
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[08ed947] | 74 | StartVbyte = EndVbyte = TEMP_ALLOC(char, CurrSize); |
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[f450f2f] | 75 | ExtVbyte = (void *)( StartVbyte + CurrSize ); |
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| 76 | Header.flink = Header.blink = &Header; |
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[0f781fb8] | 77 | Header.ulink = & this; |
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[f450f2f] | 78 | #ifdef VbyteDebug |
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| 79 | HeaderPtr = &Header; |
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| 80 | serr | "exit:VbyteHeap::VbyteHeap, this:" | &this; |
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| 81 | #endif // VbyteDebug |
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| 82 | } // VbyteHeap |
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| 83 | |
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| 84 | |
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| 85 | // Release the dynamically allocated storage for the byte area. |
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| 86 | |
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[4e8df745] | 87 | static void ^?{}( VbyteHeap & this ) with(this) { |
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[f450f2f] | 88 | free( StartVbyte ); |
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| 89 | } // ~VbyteHeap |
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| 90 | |
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| 91 | |
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| 92 | //######################### HandleNode ######################### |
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| 93 | |
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| 94 | |
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| 95 | // Create a handle node. The handle is not linked into the handle list. This is the responsibilitiy of the handle |
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| 96 | // creator. |
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| 97 | |
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[4e8df745] | 98 | static void ?{}( HandleNode & this ) with(this) { |
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[f450f2f] | 99 | #ifdef VbyteDebug |
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| 100 | serr | "enter:HandleNode::HandleNode, this:" | &this; |
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| 101 | #endif // VbyteDebug |
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| 102 | s = 0; |
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| 103 | lnth = 0; |
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| 104 | #ifdef VbyteDebug |
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| 105 | serr | "exit:HandleNode::HandleNode, this:" | &this; |
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| 106 | #endif // VbyteDebug |
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| 107 | } // HandleNode |
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| 108 | |
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| 109 | // Create a handle node. The handle is linked into the handle list at the end. This means that this handle will NOT be |
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| 110 | // in order by string address, but this is not a problem because a string with length zero does nothing during garbage |
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| 111 | // collection. |
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| 112 | |
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[4e8df745] | 113 | static void ?{}( HandleNode & this, VbyteHeap & vh ) with(this) { |
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[f450f2f] | 114 | #ifdef VbyteDebug |
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| 115 | serr | "enter:HandleNode::HandleNode, this:" | &this; |
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| 116 | #endif // VbyteDebug |
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| 117 | s = 0; |
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| 118 | lnth = 0; |
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[0f781fb8] | 119 | ulink = &vh; |
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[f450f2f] | 120 | AddThisAfter( this, *vh.Header.blink ); |
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| 121 | #ifdef VbyteDebug |
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| 122 | serr | "exit:HandleNode::HandleNode, this:" | &this; |
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| 123 | #endif // VbyteDebug |
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| 124 | } // HandleNode |
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| 125 | |
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| 126 | |
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| 127 | // Delete a node from the handle list by unchaining it from the list. If the handle node was allocated dynamically, it |
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| 128 | // is the responsibility of the creator to destroy it. |
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| 129 | |
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[4e8df745] | 130 | static void ^?{}( HandleNode & this ) with(this) { |
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[f450f2f] | 131 | #ifdef VbyteDebug |
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| 132 | serr | "enter:HandleNode::~HandleNode, this:" | & this; |
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| 133 | { |
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| 134 | serr | nlOff; |
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| 135 | serr | " lnth:" | lnth | " s:" | (void *)s | ",\""; |
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| 136 | for ( int i = 0; i < lnth; i += 1 ) { |
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| 137 | serr | s[i]; |
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| 138 | } // for |
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| 139 | serr | "\" flink:" | flink | " blink:" | blink | nl; |
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| 140 | serr | nlOn; |
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| 141 | } |
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| 142 | #endif // VbyteDebug |
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| 143 | DeleteNode( this ); |
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| 144 | } // ~HandleNode |
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| 145 | |
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| 146 | |
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[0f781fb8] | 147 | //######################### String Sharing Context ######################### |
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[f450f2f] | 148 | |
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[0f781fb8] | 149 | static string_sharectx * ambient_string_sharectx; // fickle top of stack |
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| 150 | static string_sharectx default_string_sharectx = {NEW_SHARING}; // stable bottom of stack |
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[f450f2f] | 151 | |
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[0f781fb8] | 152 | void ?{}( string_sharectx & this, StringSharectx_Mode mode ) with( this ) { |
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| 153 | (older){ ambient_string_sharectx }; |
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| 154 | if ( mode == NEW_SHARING ) { |
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[804bf677] | 155 | (activeHeap){ new( (size_t) 1000 ) }; |
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[0f781fb8] | 156 | } else { |
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| 157 | verify( mode == NO_SHARING ); |
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| 158 | (activeHeap){ 0p }; |
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| 159 | } |
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| 160 | ambient_string_sharectx = & this; |
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| 161 | } |
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| 162 | |
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| 163 | void ^?{}( string_sharectx & this ) with( this ) { |
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| 164 | if ( activeHeap ) delete( activeHeap ); |
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| 165 | |
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| 166 | // unlink this from older-list starting from ambient_string_sharectx |
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| 167 | // usually, this==ambient_string_sharectx and the loop runs zero times |
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| 168 | string_sharectx *& c = ambient_string_sharectx; |
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| 169 | while ( c != &this ) &c = &c->older; // find this |
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| 170 | c = this.older; // unlink |
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| 171 | } |
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| 172 | |
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| 173 | //######################### String Resource ######################### |
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| 174 | |
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| 175 | |
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| 176 | VbyteHeap * DEBUG_string_heap() { |
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| 177 | assert( ambient_string_sharectx->activeHeap && "No sharing context is active" ); |
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| 178 | return ambient_string_sharectx->activeHeap; |
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| 179 | } |
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[6cc87c0] | 180 | |
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| 181 | size_t DEBUG_string_bytes_avail_until_gc( VbyteHeap * heap ) { |
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| 182 | return ((char*)heap->ExtVbyte) - heap->EndVbyte; |
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| 183 | } |
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| 184 | |
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[7b0e8b7] | 185 | size_t DEBUG_string_bytes_in_heap( VbyteHeap * heap ) { |
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| 186 | return heap->CurrSize; |
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| 187 | } |
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| 188 | |
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[6cc87c0] | 189 | const char * DEBUG_string_heap_start( VbyteHeap * heap ) { |
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| 190 | return heap->StartVbyte; |
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| 191 | } |
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| 192 | |
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[f450f2f] | 193 | // Returns the size of the string in bytes |
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| 194 | size_t size(const string_res &s) with(s) { |
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| 195 | return Handle.lnth; |
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| 196 | } |
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| 197 | |
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| 198 | // Output operator |
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| 199 | ofstream & ?|?(ofstream &out, const string_res &s) { |
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| 200 | // Store auto-newline state so it can be restored |
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| 201 | bool anl = getANL$(out); |
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| 202 | nlOff(out); |
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| 203 | for (size_t i = 0; i < s.Handle.lnth; i++) { |
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| 204 | out | s[i]; |
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| 205 | } |
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[7d25f44] | 206 | out | sepVal; |
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[f450f2f] | 207 | // Re-apply newlines after done, for chaining version |
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| 208 | if (anl) nlOn(out); |
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| 209 | return out; |
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| 210 | } |
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| 211 | |
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| 212 | void ?|?(ofstream &out, const string_res &s) { |
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| 213 | // Store auto-newline state so it can be restored |
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| 214 | bool anl = getANL$(out); |
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[2b30370] | 215 | if( s.Handle.lnth == 0 ) { |
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| 216 | sout | ""; |
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| 217 | } else { |
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| 218 | nlOff(out); |
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| 219 | for (size_t i = 0; i < s.Handle.lnth; i++) { |
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| 220 | // Need to re-apply on the last output operator, for whole-statement version |
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| 221 | if (anl && i == s.Handle.lnth-1) nlOn(out); |
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| 222 | out | s[i]; |
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| 223 | } |
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[f450f2f] | 224 | } |
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| 225 | } |
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| 226 | |
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| 227 | // Empty constructor |
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| 228 | void ?{}(string_res &s) with(s) { |
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[804bf677] | 229 | if( ambient_string_sharectx->activeHeap ) { |
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| 230 | (Handle){ * ambient_string_sharectx->activeHeap }; |
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| 231 | (shareEditSet_owns_ulink){ false }; |
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[2b30370] | 232 | verify( Handle.s == 0p && Handle.lnth == 0 ); |
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[804bf677] | 233 | } else { |
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| 234 | (Handle){ * new( (size_t) 10 ) }; // TODO: can I lazily avoid allocating for empty string |
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| 235 | (shareEditSet_owns_ulink){ true }; |
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[2b30370] | 236 | Handle.s = Handle.ulink->StartVbyte; |
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| 237 | verify( Handle.lnth == 0 ); |
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[804bf677] | 238 | } |
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[f450f2f] | 239 | s.shareEditSet_prev = &s; |
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| 240 | s.shareEditSet_next = &s; |
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| 241 | } |
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| 242 | |
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[4e8df745] | 243 | static void eagerCopyCtorHelper(string_res &s, const char* rhs, size_t rhslnth) with(s) { |
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[804bf677] | 244 | if( ambient_string_sharectx->activeHeap ) { |
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| 245 | (Handle){ * ambient_string_sharectx->activeHeap }; |
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| 246 | (shareEditSet_owns_ulink){ false }; |
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| 247 | } else { |
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| 248 | (Handle){ * new( rhslnth ) }; |
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| 249 | (shareEditSet_owns_ulink){ true }; |
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| 250 | } |
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[0f781fb8] | 251 | Handle.s = VbyteAlloc(*Handle.ulink, rhslnth); |
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[f450f2f] | 252 | Handle.lnth = rhslnth; |
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[08ed947] | 253 | memmove( Handle.s, rhs, rhslnth ); |
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[f450f2f] | 254 | s.shareEditSet_prev = &s; |
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| 255 | s.shareEditSet_next = &s; |
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| 256 | } |
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| 257 | |
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[4b3b352] | 258 | // Constructor from a raw buffer and size |
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| 259 | void ?{}(string_res &s, const char* rhs, size_t rhslnth) with(s) { |
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| 260 | eagerCopyCtorHelper(s, rhs, rhslnth); |
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| 261 | } |
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| 262 | |
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[fe18b46] | 263 | // private ctor (not in header): use specified heap (ignore ambient) and copy chars in |
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| 264 | void ?{}( string_res &s, VbyteHeap & heap, const char* rhs, size_t rhslnth ) with(s) { |
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| 265 | (Handle){ heap }; |
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| 266 | Handle.s = VbyteAlloc(*Handle.ulink, rhslnth); |
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| 267 | Handle.lnth = rhslnth; |
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| 268 | (s.shareEditSet_owns_ulink){ false }; |
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[08ed947] | 269 | memmove( Handle.s, rhs, rhslnth ); |
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[fe18b46] | 270 | s.shareEditSet_prev = &s; |
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| 271 | s.shareEditSet_next = &s; |
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| 272 | } |
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| 273 | |
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[f450f2f] | 274 | // General copy constructor |
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| 275 | void ?{}(string_res &s, const string_res & s2, StrResInitMode mode, size_t start, size_t end ) { |
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| 276 | |
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[218096f] | 277 | verify( start <= end && end <= s2.Handle.lnth ); |
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| 278 | |
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[fe18b46] | 279 | if (s2.Handle.ulink != ambient_string_sharectx->activeHeap && mode == COPY_VALUE) { |
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| 280 | // crossing heaps (including private): copy eagerly |
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| 281 | eagerCopyCtorHelper(s, s2.Handle.s + start, end - start); |
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| 282 | verify(s.shareEditSet_prev == &s); |
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| 283 | verify(s.shareEditSet_next == &s); |
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| 284 | } else { |
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[4b3b352] | 285 | (s.Handle){}; |
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| 286 | s.Handle.s = s2.Handle.s + start; |
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| 287 | s.Handle.lnth = end - start; |
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[fe18b46] | 288 | s.Handle.ulink = s2.Handle.ulink; |
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| 289 | |
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[4b3b352] | 290 | AddThisAfter(s.Handle, s2.Handle ); // insert this handle after rhs handle |
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| 291 | // ^ bug? skip others at early point in string |
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[fe18b46] | 292 | |
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[4b3b352] | 293 | if (mode == COPY_VALUE) { |
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[fe18b46] | 294 | verify(s2.Handle.ulink == ambient_string_sharectx->activeHeap); |
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| 295 | // requested logical copy in same heap: defer copy until write |
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| 296 | |
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| 297 | (s.shareEditSet_owns_ulink){ false }; |
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| 298 | |
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[4b3b352] | 299 | // make s alone in its shareEditSet |
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| 300 | s.shareEditSet_prev = &s; |
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| 301 | s.shareEditSet_next = &s; |
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| 302 | } else { |
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| 303 | verify( mode == SHARE_EDITS ); |
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[fe18b46] | 304 | // sharing edits with source forces same heap as source (ignore context) |
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| 305 | |
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| 306 | (s.shareEditSet_owns_ulink){ s2.shareEditSet_owns_ulink }; |
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[f450f2f] | 307 | |
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[4b3b352] | 308 | // s2 is logically const but not implementation const |
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| 309 | string_res & s2mod = (string_res &) s2; |
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[f450f2f] | 310 | |
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[4b3b352] | 311 | // insert s after s2 on shareEditSet |
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| 312 | s.shareEditSet_next = s2mod.shareEditSet_next; |
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| 313 | s.shareEditSet_prev = &s2mod; |
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| 314 | s.shareEditSet_next->shareEditSet_prev = &s; |
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| 315 | s.shareEditSet_prev->shareEditSet_next = &s; |
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[6cc87c0] | 316 | } |
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[f450f2f] | 317 | } |
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[4b3b352] | 318 | } |
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[f450f2f] | 319 | |
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[4b3b352] | 320 | static void assignEditSet(string_res & this, string_res * shareEditSetStartPeer, string_res * shareEditSetEndPeer, |
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| 321 | char * resultSesStart, |
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| 322 | size_t resultSesLnth, |
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| 323 | HandleNode * resultPadPosition, size_t bsize ) { |
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[6cc87c0] | 324 | |
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| 325 | char * beforeBegin = shareEditSetStartPeer->Handle.s; |
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| 326 | size_t beforeLen = this.Handle.s - beforeBegin; |
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[f450f2f] | 327 | |
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[6cc87c0] | 328 | char * afterBegin = this.Handle.s + this.Handle.lnth; |
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| 329 | size_t afterLen = shareEditSetEndPeer->Handle.s + shareEditSetEndPeer->Handle.lnth - afterBegin; |
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[f450f2f] | 330 | |
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| 331 | size_t oldLnth = this.Handle.lnth; |
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| 332 | |
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[4b3b352] | 333 | this.Handle.s = resultSesStart + beforeLen; |
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[d8d512e] | 334 | this.Handle.lnth = bsize; |
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[6f7aff3] | 335 | if (resultPadPosition) |
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| 336 | MoveThisAfter( this.Handle, *resultPadPosition ); |
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[f450f2f] | 337 | |
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| 338 | // adjust all substring string and handle locations, and check if any substring strings are outside the new base string |
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[4b3b352] | 339 | char *limit = resultSesStart + resultSesLnth; |
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[f450f2f] | 340 | for (string_res * p = this.shareEditSet_next; p != &this; p = p->shareEditSet_next) { |
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[218096f] | 341 | verify (p->Handle.s >= beforeBegin); |
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[6cc87c0] | 342 | if ( p->Handle.s >= afterBegin ) { |
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[218096f] | 343 | verify ( p->Handle.s <= afterBegin + afterLen ); |
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| 344 | verify ( p->Handle.s + p->Handle.lnth <= afterBegin + afterLen ); |
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[6cc87c0] | 345 | // p starts after the edit |
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| 346 | // take start and end as end-anchored |
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| 347 | size_t startOffsetFromEnd = afterBegin + afterLen - p->Handle.s; |
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| 348 | p->Handle.s = limit - startOffsetFromEnd; |
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| 349 | // p->Handle.lnth unaffected |
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| 350 | } else if ( p->Handle.s <= beforeBegin + beforeLen ) { |
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| 351 | // p starts before, or at the start of, the edit |
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| 352 | if ( p->Handle.s + p->Handle.lnth <= beforeBegin + beforeLen ) { |
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[f450f2f] | 353 | // p ends before the edit |
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| 354 | // take end as start-anchored too |
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| 355 | // p->Handle.lnth unaffected |
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| 356 | } else if ( p->Handle.s + p->Handle.lnth < afterBegin ) { |
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[6cc87c0] | 357 | // p ends during the edit; p does not include the last character replaced |
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[f450f2f] | 358 | // clip end of p to end at start of edit |
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| 359 | p->Handle.lnth = beforeLen - ( p->Handle.s - beforeBegin ); |
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| 360 | } else { |
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| 361 | // p ends after the edit |
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[218096f] | 362 | verify ( p->Handle.s + p->Handle.lnth <= afterBegin + afterLen ); |
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[f450f2f] | 363 | // take end as end-anchored |
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| 364 | // stretch-shrink p according to the edit |
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| 365 | p->Handle.lnth += this.Handle.lnth; |
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| 366 | p->Handle.lnth -= oldLnth; |
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| 367 | } |
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| 368 | // take start as start-anchored |
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| 369 | size_t startOffsetFromStart = p->Handle.s - beforeBegin; |
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[4b3b352] | 370 | p->Handle.s = resultSesStart + startOffsetFromStart; |
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[6cc87c0] | 371 | } else { |
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[218096f] | 372 | verify ( p->Handle.s < afterBegin ); |
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[f450f2f] | 373 | // p starts during the edit |
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[218096f] | 374 | verify( p->Handle.s + p->Handle.lnth >= beforeBegin + beforeLen ); |
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[f450f2f] | 375 | if ( p->Handle.s + p->Handle.lnth < afterBegin ) { |
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[6cc87c0] | 376 | // p ends during the edit; p does not include the last character replaced |
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[f450f2f] | 377 | // set p to empty string at start of edit |
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| 378 | p->Handle.s = this.Handle.s; |
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| 379 | p->Handle.lnth = 0; |
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| 380 | } else { |
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[6cc87c0] | 381 | // p includes the end of the edit |
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[f450f2f] | 382 | // clip start of p to start at end of edit |
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[6cc87c0] | 383 | int charsToClip = afterBegin - p->Handle.s; |
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[f450f2f] | 384 | p->Handle.s = this.Handle.s + this.Handle.lnth; |
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[6cc87c0] | 385 | p->Handle.lnth -= charsToClip; |
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[f450f2f] | 386 | } |
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| 387 | } |
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[6f7aff3] | 388 | if (resultPadPosition) |
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| 389 | MoveThisAfter( p->Handle, *resultPadPosition ); // move substring handle to maintain sorted order by string position |
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[4b3b352] | 390 | } |
---|
| 391 | } |
---|
| 392 | |
---|
[1733184] | 393 | static string_res & assign_(string_res &this, const char* buffer, size_t bsize, const string_res & valSrc) { |
---|
[4b3b352] | 394 | |
---|
| 395 | // traverse the incumbent share-edit set (SES) to recover the range of a base string to which `this` belongs |
---|
| 396 | string_res * shareEditSetStartPeer = & this; |
---|
| 397 | string_res * shareEditSetEndPeer = & this; |
---|
| 398 | for (string_res * editPeer = this.shareEditSet_next; editPeer != &this; editPeer = editPeer->shareEditSet_next) { |
---|
| 399 | if ( editPeer->Handle.s < shareEditSetStartPeer->Handle.s ) { |
---|
| 400 | shareEditSetStartPeer = editPeer; |
---|
| 401 | } |
---|
| 402 | if ( shareEditSetEndPeer->Handle.s + shareEditSetEndPeer->Handle.lnth < editPeer->Handle.s + editPeer->Handle.lnth) { |
---|
| 403 | shareEditSetEndPeer = editPeer; |
---|
| 404 | } |
---|
[f450f2f] | 405 | } |
---|
[4b3b352] | 406 | |
---|
| 407 | verify( shareEditSetEndPeer->Handle.s >= shareEditSetStartPeer->Handle.s ); |
---|
[0ca15b7] | 408 | size_t origEditSetLength = shareEditSetEndPeer->Handle.s + shareEditSetEndPeer->Handle.lnth - shareEditSetStartPeer->Handle.s; |
---|
| 409 | verify( origEditSetLength >= this.Handle.lnth ); |
---|
[4b3b352] | 410 | |
---|
[6f7aff3] | 411 | if ( this.shareEditSet_owns_ulink ) { // assigning to private context |
---|
| 412 | // ok to overwrite old value within LHS |
---|
| 413 | char * prefixStartOrig = shareEditSetStartPeer->Handle.s; |
---|
| 414 | int prefixLen = this.Handle.s - prefixStartOrig; |
---|
| 415 | char * suffixStartOrig = this.Handle.s + this.Handle.lnth; |
---|
| 416 | int suffixLen = shareEditSetEndPeer->Handle.s + shareEditSetEndPeer->Handle.lnth - suffixStartOrig; |
---|
| 417 | |
---|
| 418 | int delta = bsize - this.Handle.lnth; |
---|
| 419 | if ( char * oldBytes = VbyteTryAdjustLast( *this.Handle.ulink, delta ) ) { |
---|
| 420 | // growing: copy from old to new |
---|
[0ca15b7] | 421 | char * dest = VbyteAlloc( *this.Handle.ulink, origEditSetLength + delta ); |
---|
[fe18b46] | 422 | char *destCursor = dest; memcpy(destCursor, prefixStartOrig, prefixLen); |
---|
| 423 | destCursor += prefixLen; memcpy(destCursor, buffer , bsize ); |
---|
| 424 | destCursor += bsize; memcpy(destCursor, suffixStartOrig, suffixLen); |
---|
[6f7aff3] | 425 | assignEditSet(this, shareEditSetStartPeer, shareEditSetEndPeer, |
---|
| 426 | dest, |
---|
[0ca15b7] | 427 | origEditSetLength + delta, |
---|
[6f7aff3] | 428 | 0p, bsize); |
---|
| 429 | free( oldBytes ); |
---|
| 430 | } else { |
---|
| 431 | // room is already allocated in-place: bubble suffix and overwite middle |
---|
| 432 | memmove( suffixStartOrig + delta, suffixStartOrig, suffixLen ); |
---|
| 433 | memcpy( this.Handle.s, buffer, bsize ); |
---|
| 434 | |
---|
| 435 | assignEditSet(this, shareEditSetStartPeer, shareEditSetEndPeer, |
---|
| 436 | shareEditSetStartPeer->Handle.s, |
---|
[0ca15b7] | 437 | origEditSetLength + delta, |
---|
[6f7aff3] | 438 | 0p, bsize); |
---|
| 439 | } |
---|
[4b3b352] | 440 | |
---|
[6f7aff3] | 441 | } else if ( // assigning to shared context |
---|
[0ca15b7] | 442 | this.Handle.lnth == origEditSetLength && // overwriting entire run of SES |
---|
[6f7aff3] | 443 | & valSrc && // sourcing from a managed string |
---|
| 444 | valSrc.Handle.ulink == this.Handle.ulink ) { // sourcing from same heap |
---|
[4b3b352] | 445 | |
---|
[6f7aff3] | 446 | // SES's result will only use characters from the source string => reuse source |
---|
[4b3b352] | 447 | assignEditSet(this, shareEditSetStartPeer, shareEditSetEndPeer, |
---|
| 448 | valSrc.Handle.s, |
---|
| 449 | valSrc.Handle.lnth, |
---|
| 450 | &((string_res&)valSrc).Handle, bsize); |
---|
| 451 | |
---|
| 452 | } else { |
---|
[6f7aff3] | 453 | // overwriting a proper substring of some string: mash characters from old and new together (copy on write) |
---|
| 454 | // OR we are importing characters: need to copy eagerly (can't refer to source) |
---|
[4b3b352] | 455 | |
---|
| 456 | // full string is from start of shareEditSetStartPeer thru end of shareEditSetEndPeer |
---|
| 457 | // `this` occurs in the middle of it, to be replaced |
---|
| 458 | // build up the new text in `pasting` |
---|
| 459 | |
---|
| 460 | string_res pasting = { |
---|
| 461 | * this.Handle.ulink, // maintain same heap, regardless of context |
---|
| 462 | shareEditSetStartPeer->Handle.s, // start of SES |
---|
| 463 | this.Handle.s - shareEditSetStartPeer->Handle.s }; // length of SES, before this |
---|
| 464 | append( pasting, |
---|
| 465 | buffer, // start of replacement for this |
---|
| 466 | bsize ); // length of replacement for this |
---|
| 467 | append( pasting, |
---|
| 468 | this.Handle.s + this.Handle.lnth, // start of SES after this |
---|
| 469 | shareEditSetEndPeer->Handle.s + shareEditSetEndPeer->Handle.lnth - |
---|
| 470 | (this.Handle.s + this.Handle.lnth) ); // length of SES, after this |
---|
| 471 | |
---|
| 472 | // The above string building can trigger compaction. |
---|
| 473 | // The reference points (that are arguments of the string building) may move during that building. |
---|
| 474 | // From this point on, they are stable. |
---|
| 475 | |
---|
| 476 | assignEditSet(this, shareEditSetStartPeer, shareEditSetEndPeer, |
---|
| 477 | pasting.Handle.s, |
---|
| 478 | pasting.Handle.lnth, |
---|
| 479 | &pasting.Handle, bsize); |
---|
| 480 | } |
---|
[1733184] | 481 | |
---|
| 482 | return this; |
---|
[4b3b352] | 483 | } |
---|
| 484 | |
---|
[1733184] | 485 | string_res & assign(string_res &this, const char* buffer, size_t bsize) { |
---|
| 486 | return assign_(this, buffer, bsize, *0p); |
---|
[f450f2f] | 487 | } |
---|
| 488 | |
---|
[1733184] | 489 | string_res & ?=?(string_res &s, char other) { |
---|
| 490 | return assign(s, &other, 1); |
---|
[d8d512e] | 491 | } |
---|
| 492 | |
---|
| 493 | // Copy assignment operator |
---|
[1733184] | 494 | string_res & ?=?(string_res & this, const string_res & rhs) with( this ) { |
---|
| 495 | return assign_(this, rhs.Handle.s, rhs.Handle.lnth, rhs); |
---|
[d8d512e] | 496 | } |
---|
| 497 | |
---|
[1733184] | 498 | string_res & ?=?(string_res & this, string_res & rhs) with( this ) { |
---|
[f450f2f] | 499 | const string_res & rhs2 = rhs; |
---|
[1733184] | 500 | return this = rhs2; |
---|
[f450f2f] | 501 | } |
---|
| 502 | |
---|
| 503 | |
---|
| 504 | // Destructor |
---|
| 505 | void ^?{}(string_res &s) with(s) { |
---|
| 506 | // much delegated to implied ^VbyteSM |
---|
| 507 | |
---|
| 508 | // sever s from its share-edit peers, if any (four no-ops when already solo) |
---|
| 509 | s.shareEditSet_prev->shareEditSet_next = s.shareEditSet_next; |
---|
| 510 | s.shareEditSet_next->shareEditSet_prev = s.shareEditSet_prev; |
---|
[218096f] | 511 | // s.shareEditSet_next = &s; |
---|
| 512 | // s.shareEditSet_prev = &s; |
---|
[804bf677] | 513 | |
---|
| 514 | if (shareEditSet_owns_ulink && s.shareEditSet_next == &s) { // last one out |
---|
| 515 | delete( s.Handle.ulink ); |
---|
| 516 | } |
---|
[f450f2f] | 517 | } |
---|
| 518 | |
---|
| 519 | |
---|
| 520 | // Returns the character at the given index |
---|
| 521 | // With unicode support, this may be different from just the byte at the given |
---|
| 522 | // offset from the start of the string. |
---|
| 523 | char ?[?](const string_res &s, size_t index) with(s) { |
---|
| 524 | //TODO: Check if index is valid (no exceptions yet) |
---|
| 525 | return Handle.s[index]; |
---|
| 526 | } |
---|
| 527 | |
---|
[218096f] | 528 | void assignAt(const string_res &s, size_t index, char val) { |
---|
| 529 | string_res editZone = { s, SHARE_EDITS, index, index+1 }; |
---|
| 530 | assign(editZone, &val, 1); |
---|
| 531 | } |
---|
| 532 | |
---|
[d8d512e] | 533 | |
---|
[f450f2f] | 534 | /////////////////////////////////////////////////////////////////// |
---|
[d8d512e] | 535 | // Concatenation |
---|
[f450f2f] | 536 | |
---|
[d8d512e] | 537 | void append(string_res &str1, const char * buffer, size_t bsize) { |
---|
[4e8df745] | 538 | size_t clnth = str1.Handle.lnth + bsize; |
---|
| 539 | if ( str1.Handle.s + str1.Handle.lnth == buffer ) { // already juxtapose ? |
---|
[d8d512e] | 540 | // no-op |
---|
[f450f2f] | 541 | } else { // must copy some text |
---|
[4e8df745] | 542 | if ( str1.Handle.s + str1.Handle.lnth == VbyteAlloc(*str1.Handle.ulink, 0) ) { // str1 at end of string area ? |
---|
[0f781fb8] | 543 | VbyteAlloc( *str1.Handle.ulink, bsize ); // create room for 2nd part at the end of string area |
---|
[f450f2f] | 544 | } else { // copy the two parts |
---|
[fe18b46] | 545 | char * str1newBuf = VbyteAlloc( *str1.Handle.ulink, clnth ); |
---|
| 546 | char * str1oldBuf = str1.Handle.s; // must read after VbyteAlloc call in case it gs's |
---|
| 547 | str1.Handle.s = str1newBuf; |
---|
[4e8df745] | 548 | memcpy( str1.Handle.s, str1oldBuf, str1.Handle.lnth ); |
---|
[f450f2f] | 549 | } // if |
---|
[4e8df745] | 550 | memcpy( str1.Handle.s + str1.Handle.lnth, buffer, bsize ); |
---|
[f450f2f] | 551 | } // if |
---|
| 552 | str1.Handle.lnth = clnth; |
---|
| 553 | } |
---|
| 554 | |
---|
| 555 | void ?+=?(string_res &str1, const string_res &str2) { |
---|
[d8d512e] | 556 | append( str1, str2.Handle.s, str2.Handle.lnth ); |
---|
[f450f2f] | 557 | } |
---|
| 558 | |
---|
| 559 | void ?+=?(string_res &s, char other) { |
---|
[d8d512e] | 560 | append( s, &other, 1 ); |
---|
[f450f2f] | 561 | } |
---|
| 562 | |
---|
| 563 | |
---|
| 564 | |
---|
| 565 | |
---|
| 566 | |
---|
| 567 | ////////////////////////////////////////////////////////// |
---|
| 568 | // Comparisons |
---|
| 569 | |
---|
| 570 | |
---|
| 571 | bool ?==?(const string_res &s1, const string_res &s2) { |
---|
[0f781fb8] | 572 | return ByteCmp( s1.Handle.s, 0, s1.Handle.lnth, s2.Handle.s, 0, s2.Handle.lnth) == 0; |
---|
[f450f2f] | 573 | } |
---|
| 574 | |
---|
| 575 | bool ?!=?(const string_res &s1, const string_res &s2) { |
---|
| 576 | return !(s1 == s2); |
---|
| 577 | } |
---|
| 578 | bool ?==?(const string_res &s, const char* other) { |
---|
| 579 | string_res sother = other; |
---|
| 580 | return s == sother; |
---|
| 581 | } |
---|
| 582 | bool ?!=?(const string_res &s, const char* other) { |
---|
| 583 | return !(s == other); |
---|
| 584 | } |
---|
| 585 | |
---|
| 586 | |
---|
| 587 | ////////////////////////////////////////////////////////// |
---|
| 588 | // Search |
---|
| 589 | |
---|
| 590 | bool contains(const string_res &s, char ch) { |
---|
| 591 | for (i; size(s)) { |
---|
| 592 | if (s[i] == ch) return true; |
---|
| 593 | } |
---|
| 594 | return false; |
---|
| 595 | } |
---|
| 596 | |
---|
| 597 | int find(const string_res &s, char search) { |
---|
[08ed947] | 598 | return findFrom(s, 0, search); |
---|
[f450f2f] | 599 | } |
---|
| 600 | |
---|
[08ed947] | 601 | int findFrom(const string_res &s, size_t fromPos, char search) { |
---|
| 602 | // FIXME: This paricular overload (find of single char) is optimized to use memchr. |
---|
| 603 | // The general overload (find of string, memchr applying to its first character) and `contains` should be adjusted to match. |
---|
| 604 | char * searchFrom = s.Handle.s + fromPos; |
---|
| 605 | size_t searchLnth = s.Handle.lnth - fromPos; |
---|
| 606 | int searchVal = search; |
---|
| 607 | char * foundAt = (char *) memchr(searchFrom, searchVal, searchLnth); |
---|
| 608 | if (foundAt == 0p) return s.Handle.lnth; |
---|
| 609 | else return foundAt - s.Handle.s; |
---|
| 610 | } |
---|
[f450f2f] | 611 | |
---|
| 612 | int find(const string_res &s, const string_res &search) { |
---|
[08ed947] | 613 | return findFrom(s, 0, search); |
---|
| 614 | } |
---|
| 615 | |
---|
| 616 | int findFrom(const string_res &s, size_t fromPos, const string_res &search) { |
---|
| 617 | return findFrom(s, fromPos, search.Handle.s, search.Handle.lnth); |
---|
[f450f2f] | 618 | } |
---|
| 619 | |
---|
| 620 | int find(const string_res &s, const char* search) { |
---|
[08ed947] | 621 | return findFrom(s, 0, search); |
---|
| 622 | } |
---|
| 623 | int findFrom(const string_res &s, size_t fromPos, const char* search) { |
---|
| 624 | return findFrom(s, fromPos, search, strlen(search)); |
---|
[f450f2f] | 625 | } |
---|
| 626 | |
---|
| 627 | int find(const string_res &s, const char* search, size_t searchsize) { |
---|
[08ed947] | 628 | return findFrom(s, 0, search, searchsize); |
---|
| 629 | } |
---|
| 630 | |
---|
| 631 | int findFrom(const string_res &s, size_t fromPos, const char* search, size_t searchsize) { |
---|
| 632 | |
---|
| 633 | /* Remaining implementations essentially ported from Sunjay's work */ |
---|
| 634 | |
---|
| 635 | |
---|
[f450f2f] | 636 | // FIXME: This is a naive algorithm. We probably want to switch to someting |
---|
| 637 | // like Boyer-Moore in the future. |
---|
| 638 | // https://en.wikipedia.org/wiki/String_searching_algorithm |
---|
| 639 | |
---|
| 640 | // Always find the empty string |
---|
| 641 | if (searchsize == 0) { |
---|
| 642 | return 0; |
---|
| 643 | } |
---|
| 644 | |
---|
[08ed947] | 645 | for (size_t i = fromPos; i < s.Handle.lnth; i++) { |
---|
[f450f2f] | 646 | size_t remaining = s.Handle.lnth - i; |
---|
| 647 | // Never going to find the search string if the remaining string is |
---|
| 648 | // smaller than search |
---|
| 649 | if (remaining < searchsize) { |
---|
| 650 | break; |
---|
| 651 | } |
---|
| 652 | |
---|
| 653 | bool matched = true; |
---|
| 654 | for (size_t j = 0; j < searchsize; j++) { |
---|
| 655 | if (search[j] != s.Handle.s[i + j]) { |
---|
| 656 | matched = false; |
---|
| 657 | break; |
---|
| 658 | } |
---|
| 659 | } |
---|
| 660 | if (matched) { |
---|
| 661 | return i; |
---|
| 662 | } |
---|
| 663 | } |
---|
| 664 | |
---|
| 665 | return s.Handle.lnth; |
---|
| 666 | } |
---|
| 667 | |
---|
| 668 | bool includes(const string_res &s, const string_res &search) { |
---|
| 669 | return includes(s, search.Handle.s, search.Handle.lnth); |
---|
| 670 | } |
---|
| 671 | |
---|
| 672 | bool includes(const string_res &s, const char* search) { |
---|
| 673 | return includes(s, search, strlen(search)); |
---|
| 674 | } |
---|
| 675 | |
---|
| 676 | bool includes(const string_res &s, const char* search, size_t searchsize) { |
---|
| 677 | return find(s, search, searchsize) < s.Handle.lnth; |
---|
| 678 | } |
---|
| 679 | |
---|
| 680 | bool startsWith(const string_res &s, const string_res &prefix) { |
---|
| 681 | return startsWith(s, prefix.Handle.s, prefix.Handle.lnth); |
---|
| 682 | } |
---|
| 683 | |
---|
| 684 | bool startsWith(const string_res &s, const char* prefix) { |
---|
| 685 | return startsWith(s, prefix, strlen(prefix)); |
---|
| 686 | } |
---|
| 687 | |
---|
| 688 | bool startsWith(const string_res &s, const char* prefix, size_t prefixsize) { |
---|
| 689 | if (s.Handle.lnth < prefixsize) { |
---|
| 690 | return false; |
---|
| 691 | } |
---|
| 692 | return memcmp(s.Handle.s, prefix, prefixsize) == 0; |
---|
| 693 | } |
---|
| 694 | |
---|
| 695 | bool endsWith(const string_res &s, const string_res &suffix) { |
---|
| 696 | return endsWith(s, suffix.Handle.s, suffix.Handle.lnth); |
---|
| 697 | } |
---|
| 698 | |
---|
| 699 | bool endsWith(const string_res &s, const char* suffix) { |
---|
| 700 | return endsWith(s, suffix, strlen(suffix)); |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | bool endsWith(const string_res &s, const char* suffix, size_t suffixsize) { |
---|
| 704 | if (s.Handle.lnth < suffixsize) { |
---|
| 705 | return false; |
---|
| 706 | } |
---|
| 707 | // Amount to offset the bytes pointer so that we are comparing the end of s |
---|
| 708 | // to suffix. s.bytes + offset should be the first byte to compare against suffix |
---|
| 709 | size_t offset = s.Handle.lnth - suffixsize; |
---|
| 710 | return memcmp(s.Handle.s + offset, suffix, suffixsize) == 0; |
---|
| 711 | } |
---|
| 712 | |
---|
| 713 | /* Back to Mike's work */ |
---|
| 714 | |
---|
| 715 | |
---|
| 716 | /////////////////////////////////////////////////////////////////////////// |
---|
| 717 | // charclass, include, exclude |
---|
| 718 | |
---|
| 719 | void ?{}( charclass_res & this, const string_res & chars) { |
---|
| 720 | (this){ chars.Handle.s, chars.Handle.lnth }; |
---|
| 721 | } |
---|
| 722 | |
---|
| 723 | void ?{}( charclass_res & this, const char * chars ) { |
---|
| 724 | (this){ chars, strlen(chars) }; |
---|
| 725 | } |
---|
| 726 | |
---|
| 727 | void ?{}( charclass_res & this, const char * chars, size_t charssize ) { |
---|
| 728 | (this.chars){ chars, charssize }; |
---|
| 729 | // now sort it ? |
---|
| 730 | } |
---|
| 731 | |
---|
| 732 | void ^?{}( charclass_res & this ) { |
---|
| 733 | ^(this.chars){}; |
---|
| 734 | } |
---|
| 735 | |
---|
| 736 | static bool test( const charclass_res & mask, char c ) { |
---|
| 737 | // instead, use sorted char list? |
---|
| 738 | return contains( mask.chars, c ); |
---|
| 739 | } |
---|
| 740 | |
---|
| 741 | int exclude(const string_res &s, const charclass_res &mask) { |
---|
| 742 | for (int i = 0; i < size(s); i++) { |
---|
| 743 | if ( test(mask, s[i]) ) return i; |
---|
| 744 | } |
---|
| 745 | return size(s); |
---|
| 746 | } |
---|
| 747 | |
---|
| 748 | int include(const string_res &s, const charclass_res &mask) { |
---|
| 749 | for (int i = 0; i < size(s); i++) { |
---|
| 750 | if ( ! test(mask, s[i]) ) return i; |
---|
| 751 | } |
---|
| 752 | return size(s); |
---|
| 753 | } |
---|
| 754 | |
---|
| 755 | //######################### VbyteHeap "implementation" ######################### |
---|
| 756 | |
---|
| 757 | |
---|
| 758 | // Add a new HandleNode node n after the current HandleNode node. |
---|
| 759 | |
---|
[4e8df745] | 760 | static void AddThisAfter( HandleNode & this, HandleNode & n ) with(this) { |
---|
[f450f2f] | 761 | #ifdef VbyteDebug |
---|
| 762 | serr | "enter:AddThisAfter, this:" | &this | " n:" | &n; |
---|
| 763 | #endif // VbyteDebug |
---|
[08ed947] | 764 | // Performance note: we are on the critical path here. MB has ensured that the verifies don't contribute to runtime (are compiled away, like they're supposed to be). |
---|
[0f781fb8] | 765 | verify( n.ulink != 0p ); |
---|
| 766 | verify( this.ulink == n.ulink ); |
---|
[f450f2f] | 767 | flink = n.flink; |
---|
| 768 | blink = &n; |
---|
| 769 | n.flink->blink = &this; |
---|
| 770 | n.flink = &this; |
---|
| 771 | #ifdef VbyteDebug |
---|
| 772 | { |
---|
| 773 | serr | "HandleList:"; |
---|
| 774 | serr | nlOff; |
---|
| 775 | for ( HandleNode *ni = HeaderPtr->flink; ni != HeaderPtr; ni = ni->flink ) { |
---|
| 776 | serr | "\tnode:" | ni | " lnth:" | ni->lnth | " s:" | (void *)ni->s | ",\""; |
---|
| 777 | for ( int i = 0; i < ni->lnth; i += 1 ) { |
---|
| 778 | serr | ni->s[i]; |
---|
| 779 | } // for |
---|
| 780 | serr | "\" flink:" | ni->flink | " blink:" | ni->blink | nl; |
---|
| 781 | } // for |
---|
| 782 | serr | nlOn; |
---|
| 783 | } |
---|
| 784 | serr | "exit:AddThisAfter"; |
---|
| 785 | #endif // VbyteDebug |
---|
| 786 | } // AddThisAfter |
---|
| 787 | |
---|
| 788 | |
---|
| 789 | // Delete the current HandleNode node. |
---|
| 790 | |
---|
[4e8df745] | 791 | static void DeleteNode( HandleNode & this ) with(this) { |
---|
[f450f2f] | 792 | #ifdef VbyteDebug |
---|
| 793 | serr | "enter:DeleteNode, this:" | &this; |
---|
| 794 | #endif // VbyteDebug |
---|
| 795 | flink->blink = blink; |
---|
| 796 | blink->flink = flink; |
---|
| 797 | #ifdef VbyteDebug |
---|
| 798 | serr | "exit:DeleteNode"; |
---|
| 799 | #endif // VbyteDebug |
---|
| 800 | } // DeleteNode |
---|
| 801 | |
---|
| 802 | |
---|
| 803 | |
---|
| 804 | // Allocates specified storage for a string from byte-string area. If not enough space remains to perform the |
---|
[6f7aff3] | 805 | // allocation, the garbage collection routine is called. |
---|
[f450f2f] | 806 | |
---|
[1733184] | 807 | static char * VbyteAlloc( VbyteHeap & this, int size ) with(this) { |
---|
[f450f2f] | 808 | #ifdef VbyteDebug |
---|
| 809 | serr | "enter:VbyteAlloc, size:" | size; |
---|
| 810 | #endif // VbyteDebug |
---|
| 811 | uintptr_t NoBytes; |
---|
| 812 | char *r; |
---|
| 813 | |
---|
| 814 | NoBytes = ( uintptr_t )EndVbyte + size; |
---|
| 815 | if ( NoBytes > ( uintptr_t )ExtVbyte ) { // enough room for new byte-string ? |
---|
[7b0e8b7] | 816 | garbage( this, size ); // firer up the garbage collector |
---|
[4e8df745] | 817 | verify( (( uintptr_t )EndVbyte + size) <= ( uintptr_t )ExtVbyte && "garbage run did not free up required space" ); |
---|
[f450f2f] | 818 | } // if |
---|
| 819 | r = EndVbyte; |
---|
| 820 | EndVbyte += size; |
---|
| 821 | #ifdef VbyteDebug |
---|
| 822 | serr | "exit:VbyteAlloc, r:" | (void *)r | " EndVbyte:" | (void *)EndVbyte | " ExtVbyte:" | ExtVbyte; |
---|
| 823 | #endif // VbyteDebug |
---|
| 824 | return r; |
---|
| 825 | } // VbyteAlloc |
---|
| 826 | |
---|
| 827 | |
---|
[6f7aff3] | 828 | // Adjusts the last allocation in this heap by delta bytes, or resets this heap to be able to offer |
---|
| 829 | // new allocations of its original size + delta bytes. Positive delta means bigger; |
---|
| 830 | // negative means smaller. A null return indicates that the original heap location has room for |
---|
| 831 | // the requested growth. A non-null return indicates that copying to a new location is required |
---|
| 832 | // but has not been done; the returned value is the old heap storage location; `this` heap is |
---|
| 833 | // modified to reference the new location. In the copy-requred case, the caller should use |
---|
| 834 | // VbyteAlloc to claim the new space, while doing optimal copying from old to new, then free old. |
---|
| 835 | |
---|
[4e8df745] | 836 | static char * VbyteTryAdjustLast( VbyteHeap & this, int delta ) with(this) { |
---|
[6f7aff3] | 837 | |
---|
| 838 | if ( ( uintptr_t )EndVbyte + delta <= ( uintptr_t )ExtVbyte ) { |
---|
| 839 | // room available |
---|
| 840 | EndVbyte += delta; |
---|
| 841 | return 0p; |
---|
| 842 | } |
---|
| 843 | |
---|
| 844 | char *oldBytes = StartVbyte; |
---|
| 845 | |
---|
| 846 | NoOfExtensions += 1; |
---|
| 847 | CurrSize *= 2; |
---|
[08ed947] | 848 | StartVbyte = EndVbyte = TEMP_ALLOC(char, CurrSize); |
---|
[6f7aff3] | 849 | ExtVbyte = StartVbyte + CurrSize; |
---|
| 850 | |
---|
| 851 | return oldBytes; |
---|
| 852 | } |
---|
| 853 | |
---|
| 854 | |
---|
[f450f2f] | 855 | // Move an existing HandleNode node h somewhere after the current HandleNode node so that it is in ascending order by |
---|
| 856 | // the address in the byte string area. |
---|
| 857 | |
---|
[4e8df745] | 858 | static void MoveThisAfter( HandleNode & this, const HandleNode & h ) with(this) { |
---|
[f450f2f] | 859 | #ifdef VbyteDebug |
---|
| 860 | serr | "enter:MoveThisAfter, this:" | & this | " h:" | & h; |
---|
| 861 | #endif // VbyteDebug |
---|
[0f781fb8] | 862 | verify( h.ulink != 0p ); |
---|
| 863 | verify( this.ulink == h.ulink ); |
---|
[f450f2f] | 864 | if ( s < h.s ) { // check argument values |
---|
| 865 | // serr | "VbyteSM: Error - Cannot move byte string starting at:" | s | " after byte string starting at:" |
---|
| 866 | // | ( h->s ) | " and keep handles in ascending order"; |
---|
| 867 | // exit(-1 ); |
---|
[218096f] | 868 | verify( 0 && "VbyteSM: Error - Cannot move byte strings as requested and keep handles in ascending order"); |
---|
[f450f2f] | 869 | } // if |
---|
| 870 | |
---|
| 871 | HandleNode *i; |
---|
| 872 | for ( i = h.flink; i->s != 0 && s > ( i->s ); i = i->flink ); // find the position for this node after h |
---|
| 873 | if ( & this != i->blink ) { |
---|
| 874 | DeleteNode( this ); |
---|
| 875 | AddThisAfter( this, *i->blink ); |
---|
| 876 | } // if |
---|
| 877 | #ifdef VbyteDebug |
---|
| 878 | { |
---|
| 879 | serr | "HandleList:"; |
---|
| 880 | serr | nlOff; |
---|
| 881 | for ( HandleNode *n = HeaderPtr->flink; n != HeaderPtr; n = n->flink ) { |
---|
| 882 | serr | "\tnode:" | n | " lnth:" | n->lnth | " s:" | (void *)n->s | ",\""; |
---|
| 883 | for ( int i = 0; i < n->lnth; i += 1 ) { |
---|
| 884 | serr | n->s[i]; |
---|
| 885 | } // for |
---|
[6cc87c0] | 886 | serr | "\" flink:" | n->flink | " blink:" | n->blink | nl; |
---|
[f450f2f] | 887 | } // for |
---|
| 888 | serr | nlOn; |
---|
| 889 | } |
---|
[6cc87c0] | 890 | serr | "exit:MoveThisAfter"; |
---|
[f450f2f] | 891 | #endif // VbyteDebug |
---|
| 892 | } // MoveThisAfter |
---|
| 893 | |
---|
| 894 | |
---|
| 895 | |
---|
| 896 | |
---|
| 897 | |
---|
| 898 | //######################### VbyteHeap ######################### |
---|
| 899 | |
---|
| 900 | // Compare two byte strings in the byte-string area. The routine returns the following values: |
---|
| 901 | // |
---|
| 902 | // 1 => Src1-byte-string > Src2-byte-string |
---|
| 903 | // 0 => Src1-byte-string = Src2-byte-string |
---|
| 904 | // -1 => Src1-byte-string < Src2-byte-string |
---|
| 905 | |
---|
[0f781fb8] | 906 | int ByteCmp( char *Src1, int Src1Start, int Src1Lnth, char *Src2, int Src2Start, int Src2Lnth ) { |
---|
[f450f2f] | 907 | #ifdef VbyteDebug |
---|
| 908 | serr | "enter:ByteCmp, Src1Start:" | Src1Start | " Src1Lnth:" | Src1Lnth | " Src2Start:" | Src2Start | " Src2Lnth:" | Src2Lnth; |
---|
| 909 | #endif // VbyteDebug |
---|
| 910 | int cmp; |
---|
| 911 | |
---|
| 912 | CharZip: for ( int i = 0; ; i += 1 ) { |
---|
| 913 | if ( i == Src2Lnth - 1 ) { |
---|
| 914 | for ( ; ; i += 1 ) { |
---|
| 915 | if ( i == Src1Lnth - 1 ) { |
---|
| 916 | cmp = 0; |
---|
| 917 | break CharZip; |
---|
| 918 | } // exit |
---|
| 919 | if ( Src1[Src1Start + i] != ' ') { |
---|
| 920 | // SUSPECTED BUG: this could be be why Peter got the bug report about == " " (why is this case here at all?) |
---|
| 921 | cmp = 1; |
---|
| 922 | break CharZip; |
---|
| 923 | } // exit |
---|
| 924 | } // for |
---|
| 925 | } // exit |
---|
| 926 | if ( i == Src1Lnth - 1 ) { |
---|
| 927 | for ( ; ; i += 1 ) { |
---|
| 928 | if ( i == Src2Lnth - 1 ) { |
---|
| 929 | cmp = 0; |
---|
| 930 | break CharZip; |
---|
| 931 | } // exit |
---|
| 932 | if ( Src2[Src2Start + i] != ' ') { |
---|
| 933 | cmp = -1; |
---|
| 934 | break CharZip; |
---|
| 935 | } // exit |
---|
| 936 | } // for |
---|
| 937 | } // exit |
---|
| 938 | if ( Src2[Src2Start + i] != Src1[Src1Start+ i]) { |
---|
| 939 | cmp = Src1[Src1Start + i] > Src2[Src2Start + i] ? 1 : -1; |
---|
| 940 | break CharZip; |
---|
| 941 | } // exit |
---|
| 942 | } // for |
---|
| 943 | #ifdef VbyteDebug |
---|
| 944 | serr | "exit:ByteCmp, cmp:" | cmp; |
---|
| 945 | #endif // VbyteDebug |
---|
| 946 | return cmp; |
---|
| 947 | } // ByteCmp |
---|
| 948 | |
---|
| 949 | |
---|
| 950 | // The compaction moves all of the byte strings currently in use to the beginning of the byte-string area and modifies |
---|
| 951 | // the handles to reflect the new positions of the byte strings. Compaction assumes that the handle list is in ascending |
---|
| 952 | // order by pointers into the byte-string area. The strings associated with substrings do not have to be moved because |
---|
| 953 | // the containing string has been moved. Hence, they only require that their string pointers be adjusted. |
---|
| 954 | |
---|
| 955 | void compaction(VbyteHeap & this) with(this) { |
---|
| 956 | HandleNode *h; |
---|
| 957 | char *obase, *nbase, *limit; |
---|
| 958 | |
---|
| 959 | NoOfCompactions += 1; |
---|
| 960 | EndVbyte = StartVbyte; |
---|
| 961 | h = Header.flink; // ignore header node |
---|
| 962 | for (;;) { |
---|
[94647b0b] | 963 | memmove( EndVbyte, h->s, h->lnth ); |
---|
[f450f2f] | 964 | obase = h->s; |
---|
| 965 | h->s = EndVbyte; |
---|
| 966 | nbase = h->s; |
---|
| 967 | EndVbyte += h->lnth; |
---|
| 968 | limit = obase + h->lnth; |
---|
| 969 | h = h->flink; |
---|
| 970 | |
---|
| 971 | // check if any substrings are allocated within a string |
---|
| 972 | |
---|
| 973 | for (;;) { |
---|
| 974 | if ( h == &Header ) break; // end of header list ? |
---|
| 975 | if ( h->s >= limit ) break; // outside of current string ? |
---|
| 976 | h->s = nbase + (( uintptr_t )h->s - ( uintptr_t )obase ); |
---|
| 977 | h = h->flink; |
---|
| 978 | } // for |
---|
| 979 | if ( h == &Header ) break; // end of header list ? |
---|
| 980 | } // for |
---|
| 981 | } // compaction |
---|
| 982 | |
---|
| 983 | |
---|
[08ed947] | 984 | static double heap_expansion_freespace_threshold = 0.1; // default inherited from prior work: expand heap when less than 10% "free" (i.e. garbage) |
---|
| 985 | // probably an unreasonable default, but need to assess early-round tests on changing it |
---|
| 986 | |
---|
| 987 | void TUNING_set_string_heap_liveness_threshold( double val ) { |
---|
| 988 | heap_expansion_freespace_threshold = 1.0 - val; |
---|
| 989 | } |
---|
| 990 | |
---|
| 991 | |
---|
[f450f2f] | 992 | // Garbage determines the amount of free space left in the heap and then reduces, leave the same, or extends the size of |
---|
| 993 | // the heap. The heap is then compacted in the existing heap or into the newly allocated heap. |
---|
| 994 | |
---|
[7b0e8b7] | 995 | void garbage(VbyteHeap & this, int minreq ) with(this) { |
---|
[f450f2f] | 996 | #ifdef VbyteDebug |
---|
| 997 | serr | "enter:garbage"; |
---|
| 998 | { |
---|
| 999 | serr | "HandleList:"; |
---|
| 1000 | for ( HandleNode *n = Header.flink; n != &Header; n = n->flink ) { |
---|
| 1001 | serr | nlOff; |
---|
| 1002 | serr | "\tnode:" | n | " lnth:" | n->lnth | " s:" | (void *)n->s | ",\""; |
---|
| 1003 | for ( int i = 0; i < n->lnth; i += 1 ) { |
---|
| 1004 | serr | n->s[i]; |
---|
| 1005 | } // for |
---|
| 1006 | serr | nlOn; |
---|
| 1007 | serr | "\" flink:" | n->flink | " blink:" | n->blink; |
---|
| 1008 | } // for |
---|
| 1009 | } |
---|
| 1010 | #endif // VbyteDebug |
---|
| 1011 | int AmountUsed, AmountFree; |
---|
| 1012 | |
---|
| 1013 | AmountUsed = 0; |
---|
| 1014 | for ( HandleNode *i = Header.flink; i != &Header; i = i->flink ) { // calculate amount of byte area used |
---|
| 1015 | AmountUsed += i->lnth; |
---|
| 1016 | } // for |
---|
| 1017 | AmountFree = ( uintptr_t )ExtVbyte - ( uintptr_t )StartVbyte - AmountUsed; |
---|
| 1018 | |
---|
[08ed947] | 1019 | if ( ( double ) AmountFree < ( CurrSize * heap_expansion_freespace_threshold ) || AmountFree < minreq ) { // free space less than threshold or not enough to serve cur request |
---|
[f450f2f] | 1020 | |
---|
[7b0e8b7] | 1021 | extend( this, max( CurrSize, minreq ) ); // extend the heap |
---|
[f450f2f] | 1022 | |
---|
| 1023 | // Peter says, "This needs work before it should be used." |
---|
| 1024 | // } else if ( AmountFree > CurrSize / 2 ) { // free space greater than 3 times the initial allocation ? |
---|
| 1025 | // reduce(( AmountFree / CurrSize - 3 ) * CurrSize ); // reduce the memory |
---|
| 1026 | |
---|
[97c215f] | 1027 | // `extend` implies a `compaction` during the copy |
---|
| 1028 | |
---|
| 1029 | } else { |
---|
| 1030 | compaction(this); // in-place |
---|
| 1031 | }// if |
---|
[f450f2f] | 1032 | #ifdef VbyteDebug |
---|
| 1033 | { |
---|
| 1034 | serr | "HandleList:"; |
---|
| 1035 | for ( HandleNode *n = Header.flink; n != &Header; n = n->flink ) { |
---|
| 1036 | serr | nlOff; |
---|
| 1037 | serr | "\tnode:" | n | " lnth:" | n->lnth | " s:" | (void *)n->s | ",\""; |
---|
| 1038 | for ( int i = 0; i < n->lnth; i += 1 ) { |
---|
| 1039 | serr | n->s[i]; |
---|
| 1040 | } // for |
---|
| 1041 | serr | nlOn; |
---|
| 1042 | serr | "\" flink:" | n->flink | " blink:" | n->blink; |
---|
| 1043 | } // for |
---|
| 1044 | } |
---|
| 1045 | serr | "exit:garbage"; |
---|
| 1046 | #endif // VbyteDebug |
---|
| 1047 | } // garbage |
---|
| 1048 | |
---|
| 1049 | #undef VbyteDebug |
---|
| 1050 | |
---|
| 1051 | |
---|
| 1052 | |
---|
| 1053 | // Extend the size of the byte-string area by creating a new area and copying the old area into it. The old byte-string |
---|
| 1054 | // area is deleted. |
---|
| 1055 | |
---|
[7b0e8b7] | 1056 | void extend( VbyteHeap & this, int size ) with (this) { |
---|
[f450f2f] | 1057 | #ifdef VbyteDebug |
---|
| 1058 | serr | "enter:extend, size:" | size; |
---|
| 1059 | #endif // VbyteDebug |
---|
| 1060 | char *OldStartVbyte; |
---|
| 1061 | |
---|
| 1062 | NoOfExtensions += 1; |
---|
| 1063 | OldStartVbyte = StartVbyte; // save previous byte area |
---|
| 1064 | |
---|
| 1065 | CurrSize += size > InitSize ? size : InitSize; // minimum extension, initial size |
---|
[08ed947] | 1066 | StartVbyte = EndVbyte = TEMP_ALLOC(char, CurrSize); |
---|
[f450f2f] | 1067 | ExtVbyte = (void *)( StartVbyte + CurrSize ); |
---|
[7b0e8b7] | 1068 | compaction(this); // copy from old heap to new & adjust pointers to new heap |
---|
| 1069 | free( OldStartVbyte ); // release old heap |
---|
[f450f2f] | 1070 | #ifdef VbyteDebug |
---|
| 1071 | serr | "exit:extend, CurrSize:" | CurrSize; |
---|
| 1072 | #endif // VbyteDebug |
---|
| 1073 | } // extend |
---|
| 1074 | |
---|
[7b0e8b7] | 1075 | //WIP |
---|
| 1076 | #if 0 |
---|
[f450f2f] | 1077 | |
---|
| 1078 | // Extend the size of the byte-string area by creating a new area and copying the old area into it. The old byte-string |
---|
| 1079 | // area is deleted. |
---|
| 1080 | |
---|
| 1081 | void VbyteHeap::reduce( int size ) { |
---|
| 1082 | #ifdef VbyteDebug |
---|
| 1083 | serr | "enter:reduce, size:" | size; |
---|
| 1084 | #endif // VbyteDebug |
---|
| 1085 | char *OldStartVbyte; |
---|
| 1086 | |
---|
| 1087 | NoOfReductions += 1; |
---|
| 1088 | OldStartVbyte = StartVbyte; // save previous byte area |
---|
| 1089 | |
---|
| 1090 | CurrSize -= size; |
---|
| 1091 | StartVbyte = EndVbyte = new char[CurrSize]; |
---|
| 1092 | ExtVbyte = (void *)( StartVbyte + CurrSize ); |
---|
| 1093 | compaction(); // copy from old heap to new & adjust pointers to new heap |
---|
| 1094 | delete OldStartVbyte; // release old heap |
---|
| 1095 | #ifdef VbyteDebug |
---|
| 1096 | serr | "exit:reduce, CurrSize:" | CurrSize; |
---|
| 1097 | #endif // VbyteDebug |
---|
| 1098 | } // reduce |
---|
| 1099 | |
---|
| 1100 | |
---|
| 1101 | #endif |
---|