diff --git a/src/shared/mempool.pas b/src/shared/mempool.pas
index 7d30a9bc92e12f5fb02e90fd2cb10fe1584f884c..1604055c028f6620f115998343a90966a458eb5d 100644 (file)
--- a/src/shared/mempool.pas
+++ b/src/shared/mempool.pas
end;
{$ENDIF}
+(* Simple "mark/release" allocator *)
+type
+ PoolMark = Integer;
+
+ TPoolMarkRelease = record
+ private
+ mMemory: Pointer;
+ mSize: Integer;
+ mUsed: Integer;
+
+ public
+ constructor Create (aInitSize: Integer);
+
+ // free all allocated memory
+ procedure kill ();
+
+ // forget everything
+ procedure reset ();
+
+ // mark current position
+ function mark (): PoolMark; inline;
+ // forget everything from the given mark
+ procedure release (amark: PoolMark); inline;
+
+ // allocate some memory
+ // WARNING! pool can realloc it's internal storage and invalidate all previous pointers!
+ function alloc (size: Integer): Pointer; inline;
+
+ // get pointer for the given mark
+ // WARNING! pointer can become invalid after next call to `alloc()`!
+ function getPtr (amark: PoolMark): Pointer; inline;
+ end;
+
+
+var
+ framePool: TPoolMarkRelease; // temporary per-frame allocation pool
+
+
implementation
+uses
+ SysUtils
+{$IFDEF USE_MEMPOOL}
+ , hashtable
+{$ENDIF}
+ ;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
+constructor TPoolMarkRelease.Create (aInitSize: Integer);
+begin
+ if (aInitSize > 0) then
+ begin
+ mSize := aInitSize;
+ GetMem(mMemory, mSize);
+ end
+ else
+ begin
+ mMemory := nil;
+ mSize := 0;
+ end;
+ mUsed := 0;
+end;
+
+
+// free all allocated memory
+procedure TPoolMarkRelease.kill ();
+begin
+ if (mMemory <> nil) then FreeMem(mMemory);
+ mMemory := nil;
+ mSize := 0;
+ mUsed := 0;
+end;
+
+
+// forget everything
+procedure TPoolMarkRelease.reset ();
+begin
+ mUsed := 0;
+end;
+
+
+// mark current position
+function TPoolMarkRelease.mark (): PoolMark; inline;
+begin
+ result := mUsed;
+end;
+
+
+// forget everything from the given mark
+procedure TPoolMarkRelease.release (amark: PoolMark); inline;
+begin
+ if (amark < 0) or (amark > mUsed) then raise Exception.Create('MarkReleasePool is fucked (release)');
+ mUsed := amark;
+end;
+
+
+// allocate some memory
+// WARNING! pool can realloc it's internal storage and invalidate all previous pointers!
+function TPoolMarkRelease.alloc (size: Integer): Pointer; inline;
+begin
+ if (size < 0) then raise Exception.Create('MarkReleasePool: cannot allocate negative amount of bytes');
+ if (size > 1024*1024) then raise Exception.Create('MarkReleasePool: why do you need to allocate more than 1MB?');
+ // do we need to get more memory?
+ if (mUsed+size > mSize) then
+ begin
+ if (mUsed+size > 1024*1024*64) then raise Exception.Create('MarkReleasePool: more than 64MB in MarkReleasePool is insanity!');
+ while (mUsed+size > mSize) do
+ begin
+ // less than 256KB: 64KB steps
+ if (mSize < 256*1024) then mSize += 64*1024
+ // less than 1MB: 128KB steps
+ else if (mSize < 1024*1024) then mSize += 128*1024
+ // otherwise, 1MB steps
+ else mSize += 1024*1024;
+ end;
+ ReallocMem(mMemory, mSize);
+ if (mMemory = nil) then raise Exception.Create('MarkReleasePool: out of memory!');
+ end;
+ result := Pointer(PAnsiChar(mMemory)+mUsed);
+ mUsed += size;
+ assert(mUsed <= mSize);
+end;
+
+
+// get pointer for the given mark
+// WARNING! pointer can become invalid after next call to `alloc()`!
+function TPoolMarkRelease.getPtr (amark: PoolMark): Pointer; inline;
+begin
+ if (amark < 0) or (amark > mUsed) then raise Exception.Create('MarkReleasePool is fucked (getPtr)');
+ result := Pointer(PAnsiChar(mMemory)+amark);
+end;
+
+
+// ////////////////////////////////////////////////////////////////////////// //
{$IFDEF USE_MEMPOOL}
uses
hashtable;
initialization
//mpoolMap := TMemPool.Create('textmap', 64);
+ framePool := TPoolMarkRelease.Create(65536);
finalization
{$IF DEFINED(D2F_DEBUG) and NOT DEFINED(MEM_DISABLE_ACCOUNTING)}
dumpPools();