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https://gitlab.com/freepascal.org/fpc/source.git
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142 lines
3.5 KiB
PHP
142 lines
3.5 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2001 by Free Pascal development team
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This file implements all the base types and limits required
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for a minimal POSIX compliant subset required to port the compiler
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to a new OS.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{****************************************************************************
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Heap management releated routines.
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****************************************************************************}
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{Get some memory.
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P = Pointer to memory will be returned here.
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Size = Number of bytes to get. The size is rounded up to a multiple
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of 4096. This is probably not the case on non-intel 386
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versions of OS/2.
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Flags = One or more of the mfXXXX constants.}
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function DosAllocMem(var P:pointer;Size,Flag:cardinal): cardinal; cdecl;
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external 'DOSCALLS' index 299;
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function DosSetMem(P:pointer;Size,Flag:cardinal): cardinal; cdecl;
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external 'DOSCALLS' index 305;
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function DosFreeMem (P: pointer): cardinal; cdecl;
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external 'DOSCALLS' index 304;
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{$IFDEF DUMPGROW}
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{$DEFINE EXTDUMPGROW}
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{$ENDIF DUMPGROW}
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{$IFDEF EXTDUMPGROW}
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var
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Int_HeapSize: cardinal;
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{$ENDIF EXTDUMPGROW}
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{function GetHeapSize: longint; assembler;
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asm
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movl Int_HeapSize, %eax
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end ['EAX'];
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}
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function SysOSAlloc (Size: ptruint): pointer;
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var
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P: pointer;
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RC: cardinal;
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begin
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{$IFDEF EXTDUMPGROW}
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if Int_HeapSize <> high (cardinal) then
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{
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if Int_HeapSize = high (cardinal) then
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WriteLn ('Trying to allocate first heap of size ', Size)
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else
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}
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WriteLn ('Trying to grow heap by ', Size, ' to ', Int_HeapSize);
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{$ENDIF}
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RC := DosAllocMem (P, Size, HeapAllocFlags);
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if RC = 0 then
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begin
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{$IFDEF EXTDUMPGROW}
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if Int_HeapSize <> high (cardinal) then
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WriteLn ('DosAllocMem returned memory at ', cardinal (P));
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{$ENDIF}
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SysOSAlloc := P;
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{$IFDEF EXTDUMPGROW}
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if Int_HeapSize = high (cardinal) then
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Int_HeapSize := Size
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else
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Inc (Int_HeapSize, Size);
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{$ENDIF EXTDUMPGROW}
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end
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else
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begin
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SysOSAlloc := nil;
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{$IFDEF EXTDUMPGROW}
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if Int_HeapSize <> high (cardinal) then
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begin
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WriteLn ('Error ', RC, ' during additional memory allocation (DosAllocMem)!');
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{ if Int_HeapSize = high (cardinal) then
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WriteLn ('No memory allocated yet!')
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else
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}
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WriteLn ('Total allocated memory is ', Int_HeapSize);
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end;
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{$ENDIF EXTDUMPGROW}
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end;
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end;
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{$define HAS_SYSOSFREE}
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procedure SysOSFree (P: pointer; Size: ptruint);
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{$IFDEF EXTDUMPGROW}
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var
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RC: cardinal;
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{$ENDIF EXTDUMPGROW}
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begin
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{$IFDEF EXTDUMPGROW}
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WriteLn ('Trying to free memory!');
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WriteLn ('Total allocated memory is ', Int_HeapSize);
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Dec (Int_HeapSize, Size);
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RC :=
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{$ENDIF EXTDUMPGROW}
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DosFreeMem (P);
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{$IFDEF EXTDUMPGROW}
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if RC <> 0 then
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begin
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WriteLn ('Error ', RC, ' during memory deallocation (DosFreeMem)!');
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WriteLn ('Total allocated memory is ', Int_HeapSize);
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end;
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{$ENDIF EXTDUMPGROW}
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end;
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function ReadUseHighMem: boolean;
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begin
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ReadUseHighMem := HeapAllocFlags and $400 = $400;
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end;
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procedure WriteUseHighMem (B: boolean);
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begin
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if B then
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HeapAllocFlags := HeapAllocFlags or $400
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else
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HeapAllocFlags := HeapAllocFlags and not ($400);
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end;
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