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unit gcmem;
interface
{$IFDEF FPC}
{$PACKRECORDS C}
{$ENDIF}
Const
LibName = 'gc';
type
ptrdiff_t = longint;
size_t = dword;
wchar_t = longint;
GC_PTR = pointer;
GC_word = dword;
GC_signed_word = longint;
// procedure GC_init;cdecl; external LibName name 'GC_init';
// not needed
Function Malloc(Size : size_t) : Pointer; cdecl; external LibName name 'GC_malloc';
Procedure Free(P : pointer); cdecl; external LibName name 'GC_free';
function ReAlloc(P : Pointer; Size : size_t) : pointer; cdecl; external LibName name 'GC_realloc';
Function Calloc(unitSize,UnitCount : size_t) : pointer;
implementation
Function Calloc(unitSize,UnitCount : size_t) : pointer;
var p:pointer;
begin
p:=Malloc(unitSize*UnitCount);
if p<>nil then FillChar(p^, unitSize*UnitCount,0); //not needed
//GC_malloc seems to clear memory
Calloc:=p;
end;
Function CGetMem (Size : ptruint) : Pointer;
begin
CGetMem:=Malloc(size_t(Size+sizeof(ptruint)));
if (CGetMem <> nil) then
begin
Pptruint(CGetMem)^ := size;
inc(CGetMem,sizeof(ptruint));
end;
end;
Function CFreeMem (P : pointer) : ptruint;
begin
if (p <> nil) then
dec(p,sizeof(ptruint));
Free(P);
CFreeMem:=0;
end;
Function CFreeMemSize(p:pointer;Size:ptruint):ptruint;
begin
if size<=0 then
exit;
if (p <> nil) then
begin
if (size <> Pptruint(p-sizeof(ptruint))^) then
runerror(204);
end;
CFreeMemSize:=CFreeMem(P);
end;
Function CAllocMem(Size : ptruint) : Pointer;
begin
CAllocMem:=calloc(size_t(Size+sizeof(ptruint)),size_t(1));
if (CAllocMem <> nil) then
begin
Pptruint(CAllocMem)^ := size;
inc(CAllocMem,sizeof(ptruint));
end;
end;
Function CReAllocMem (var p:pointer;Size:ptruint):Pointer;
begin
if size=0 then
begin
if p<>nil then
begin
dec(p,sizeof(ptruint));
free(p);
p:=nil;
end;
end
else
begin
inc(size,sizeof(ptruint));
if p=nil then
p:=malloc(size_t(Size))
else
begin
dec(p,sizeof(ptruint));
p:=realloc(p,size_t(size));
end;
if (p <> nil) then
begin
Pptruint(p)^ := size-sizeof(ptruint);
inc(p,sizeof(ptruint));
end;
end;
CReAllocMem:=p;
end;
Function CMemSize (p:pointer): ptruint;
begin
CMemSize:=Pptruint(p-sizeof(ptruint))^;
end;
function CGetHeapStatus:THeapStatus;
var res: THeapStatus;
begin
fillchar(res,sizeof(res),0);
CGetHeapStatus:=res;
end;
function CGetFPCHeapStatus:TFPCHeapStatus;
begin
fillchar(CGetFPCHeapStatus,sizeof(CGetFPCHeapStatus),0);
end;
Const
CMemoryManager : TMemoryManager =
(
NeedLock : false;
GetMem : @CGetmem;
FreeMem : @CFreeMem;
FreememSize : @CFreememSize;
AllocMem : @CAllocMem;
ReallocMem : @CReAllocMem;
MemSize : @CMemSize;
InitThread : nil;
DoneThread : nil;
RelocateHeap : nil;
GetHeapStatus : @CGetHeapStatus;
GetFPCHeapStatus: @CGetFPCHeapStatus;
);
Var
OldMemoryManager : TMemoryManager;
Initialization
GetMemoryManager (OldMemoryManager);
SetMemoryManager (CmemoryManager);
Finalization
SetMemoryManager (OldMemoryManager);
end.
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