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CD ROM Paradise Collection 4 1995 Nov.iso
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0061_Free Stack Space.pas
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Pascal/Delphi Source File
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1994-08-24
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2KB
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109 lines
{
Here is some code I use to find out how many stack space is used after a
run. I guess it won't work in protected mode. Be aware
it isn't byte-resolution ! I'd like to hear about enhancements.
}
unit Stack;
interface
procedure InitStack;
procedure TestStack;
implementation
(*
Routinen zum Pruefen des Stackbedarfs
Wilfried F?rber, Isar Software GmbH
Ringeisstr. 2a, 8000 Muenchen 2
August 1991
Routinen zum Pruefen, wieviel Stack wirklich benoetigt wird.
Willfried F?rber, Isar Software GmbH, August 1991
Port von C nach Pascal: Jacques NOMSSI NZALI,
email: nomssi@physikus.physik.tu-chemnitz.de
*)
Var STKHQQ : word;
const
stacktext : packed array[1..4] of char = 'STAC';
MAXSTACK = (1024 div 4)*64;
function atopsp : Word; assembler;
asm
mov ax, sp
end;
procedure InitStack;
var
AktStack,
Anzahl : Word;
begin
STKHQQ := StackLimit;
asm
mov AktStack, bp
end;
Anzahl := (AktStack - STKHQQ) div 4;
asm
mov cx, [Anzahl]
mov di, [STKHQQ]
mov ax, ss
mov es, ax
mov ax, Offset StackText
@L1:
mov si, ax
movsw
movsw
loop @L1
end;
end;
function StackSize : Word;
begin
StackSize := - STKHQQ + atopsp;
end;
function StackUsed : Word;
var
StackFrei,
StackMax : Word;
Begin
StackMax := StackSize;
asm
mov cx, MAXSTACK
mov di, [STKHQQ]
mov ax, ss
mov es, ax
mov ax, Offset Stacktext
@L1:
mov si, ax
cmpsw
jnz @L2
cmpsw
loope @L1
@L2:
sub cx, MAXSTACK
not cx
mov [StackFrei], cx
end;
StackFrei := StackFrei*4;
StackUsed := StackMax - StackFrei;
end;
procedure TestStack;
var
StackVerb, _MaxStack : Word;
begin
_MaxStack := StackSize;
StackVerb := StackUsed;
WriteLn('STACK-VERBRAUCHSTEST ---------------------- ');
WriteLn('Programmstack :', _MaxStack);
WriteLn('Es wurden ca. ',StackVerb,' Bytes benoetigt.');
WriteLn('Stack-Reserve :',MaxStack-StackVerb,' Bytes.');
ReadLn;
end;
begin
InitStack;
end.