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86 lines
2.5 KiB
PHP
86 lines
2.5 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
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*****************************************************************************}
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const
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WasmMemoryPageSize=65536;
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var
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InitialHeapBlockStart: Pointer;
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InitialHeapBlockEnd: Pointer;
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{$ifdef FPC_WASM_THREADS}
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InitialHeapCriticalSection: TRtlCriticalSection;
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InitialHeapCriticalSectionInitialized: Boolean = false;
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{$endif FPC_WASM_THREADS}
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procedure SetInitialHeapBlockStart(p: Pointer);[Public, Alias : 'FPC_WASM_SETINITIALHEAPBLOCKSTART'];
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begin
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InitialHeapBlockStart:=p;
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end;
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procedure InitInitialHeapBlock;
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begin
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InitialHeapBlockEnd:=Pointer(PtrUInt(fpc_wasm32_memory_size)*WasmMemoryPageSize);
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end;
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function SysOSAlloc(size: ptruint): pointer;
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const
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err = high(longword);
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var
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res: ptruint;
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avail: SizeUInt;
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grow_pages: LongInt;
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begin
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{$ifdef FPC_WASM_THREADS}
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if InitialHeapCriticalSectionInitialized then
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EnterCriticalSection(InitialHeapCriticalSection);
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{$endif FPC_WASM_THREADS}
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avail:=PtrUInt(InitialHeapBlockEnd)-PtrUInt(InitialHeapBlockStart);
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if avail>=size then
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begin
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SysOSAlloc:=InitialHeapBlockStart;
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Inc(InitialHeapBlockStart,size);
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end
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else
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begin
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grow_pages:=(size-avail+WasmMemoryPageSize-1) div WasmMemoryPageSize;
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res:=fpc_wasm32_memory_grow(grow_pages);
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if res<>err then
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begin
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SysOSAlloc:=InitialHeapBlockStart;//pointer(res*WasmMemoryPageSize)
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Inc(InitialHeapBlockStart,size);
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Inc(InitialHeapBlockEnd,grow_pages*WasmMemoryPageSize);
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end
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else
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SysOSAlloc:=nil;
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if assigned(WasmGrowMemoryCallback) then
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WasmGrowMemoryCallback(grow_pages);
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end;
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{$ifdef FPC_WASM_THREADS}
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if InitialHeapCriticalSectionInitialized then
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LeaveCriticalSection(InitialHeapCriticalSection);
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{$endif FPC_WASM_THREADS}
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end;
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procedure SysOSFree(p: pointer; size: ptruint);
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begin
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end;
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