1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
Author: Mattias Gaertner
Abstract:
Defines TCodeToolMemManager, which is the base class for the various
memory manager in the codetools. An own memory manager is somewhat faster
and makes debugging and profiling easier.
}
unit CodeToolMemManager;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
PCodeToolMemManagerItem = ^TCodeToolMemManagerItem;
TCodeToolMemManagerItem = record
Next: PCodeToolMemManagerItem;
end;
// memory manager template
TCodeToolMemManager = class
private
procedure SetMaxFreeRatio(NewValue: integer);
procedure SetMinFree(NewValue: integer);
protected
FFirstFree: PCodeToolMemManagerItem;
FFreeCount: integer;
FCount: integer;
FMinFree: integer;
FMaxFreeRatio: integer;
{$IFDEF DebugCTMemManager}
FAllocatedCount: int64;
FFreedCount: int64;
{$ENDIF}
procedure DisposeItem({%H-}AnItem: PCodeToolMemManagerItem);
function NewItem: PCodeToolMemManagerItem;
procedure FreeFirstItem; virtual;
public
property MinimumFreeCount: integer read FMinFree write SetMinFree;
property MaximumFreeCountRatio: integer
read FMaxFreeRatio write SetMaxFreeRatio; // in one eighth steps
property Count: integer read FCount;
property FreeCount: integer read FFreeCount;
{$IFDEF DebugCTMemManager}
property AllocatedCount: int64 read FAllocatedCount;
property FreedCount: int64 read FFreedCount;
{$ENDIF}
procedure Clear;
constructor Create;
destructor Destroy; override;
end;
implementation
{ TCodeToolMemManager }
procedure TCodeToolMemManager.Clear;
begin
while FFirstFree<>nil do begin
FreeFirstItem;
{$IFDEF DebugCTMemManager}
inc(FFreedCount);
{$ENDIF}
end;
FFreeCount:=0;
end;
constructor TCodeToolMemManager.Create;
begin
inherited Create;
FFirstFree:=nil;
FFreeCount:=0;
FCount:=0;
{$IFDEF DebugCTMemManager}
FAllocatedCount:=0;
FFreedCount:=0;
{$ENDIF}
FMinFree:=100000;
FMaxFreeRatio:=8; // 1:1
end;
destructor TCodeToolMemManager.Destroy;
begin
Clear;
inherited Destroy;
end;
procedure TCodeToolMemManager.DisposeItem(AnItem: PCodeToolMemManagerItem);
begin
if (FFreeCount<FMinFree) or (FFreeCount<((FCount shr 3)*FMaxFreeRatio)) then
begin
// add ANode to Free list
//AddItemToFreeList(AnItem);
inc(FFreeCount);
end else begin
// free list full -> free the ANode
//FreeItem(AnItem);
{$IFDEF DebugCTMemManager}
inc(FFreedCount);
{$ENDIF}
end;
dec(FCount);
end;
function TCodeToolMemManager.NewItem: PCodeToolMemManagerItem;
begin
if FFirstFree<>nil then begin
// take from free list
Result:=FFirstFree;
FFirstFree:=FFirstFree^.Next;
Result^.Next:=nil;
dec(FFreeCount);
end else begin
// free list empty -> create new node
New(Result);
{$IFDEF DebugCTMemManager}
inc(FAllocatedCount);
{$ENDIF}
end;
inc(FCount);
end;
procedure TCodeToolMemManager.SetMaxFreeRatio(NewValue: integer);
begin
if NewValue<0 then NewValue:=0;
if NewValue=FMaxFreeRatio then exit;
FMaxFreeRatio:=NewValue;
end;
procedure TCodeToolMemManager.SetMinFree(NewValue: integer);
begin
if NewValue<0 then NewValue:=0;
if NewValue=FMinFree then exit;
FMinFree:=NewValue;
end;
procedure TCodeToolMemManager.FreeFirstItem;
var Item: PCodeToolMemManagerItem;
begin
Item:=FFirstFree;
FFirstFree:=FFirstFree^.Next;
Dispose(Item);
end;
end.
|
