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https://gitlab.com/freepascal.org/fpc/source.git
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+ finished the internal omf library writer (implementing writing of the library
dictionary at the and of the file) and enabled it for the i8086 internal asm git-svn-id: trunk@30701 -
This commit is contained in:
nickysn
parent
dbe1081389
commit
7923b6142e
@ -858,7 +858,7 @@ implementation
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asmbin : '';
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asmcmd : '';
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supported_targets : [system_i8086_msdos];
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flags : [af_outputbinary,af_needar,af_no_debug];
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flags : [af_outputbinary,af_no_debug];
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labelprefix : '..@';
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comment : '; ';
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dollarsign: '$';
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@ -504,6 +504,15 @@ interface
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property PaddingBytes: Word read FPaddingBytes write FPaddingBytes;
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end;
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const
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{ list of all the possible omf library dictionary block counts - contains
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all the prime numbers less than 255 }
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OmfLibDictionaryBlockCounts: array [0..53] of Byte =
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(2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,
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101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,
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193,197,199,211,223,227,229,233,239,241,251);
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type
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TOmfLibHash = record
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block_x: Integer;
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block_d: Integer;
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@ -30,10 +30,21 @@ interface
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uses
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cclasses,
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globtype,
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owbase;
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type
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{ TOmfLibDictionaryEntry }
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TOmfLibDictionaryEntry=class(TFPHashObject)
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private
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FPageNum: Word;
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public
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constructor Create(HashObjectList:TFPHashObjectList;const aName:TSymStr;aPageNum:Word);
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property PageNum: Word read FPageNum write FPageNum;
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end;
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{ TOmfLibObjectWriter }
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TOmfLibObjectWriter=class(TObjectWriter)
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@ -44,10 +55,13 @@ type
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FObjFileName: string;
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FObjData: TDynamicArray;
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FObjStartPage: Word;
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FDictionary: TFPHashObjectList;
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procedure WriteHeader(DictStart: DWord; DictBlocks: Word);
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procedure WriteFooter;
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procedure WriteLib;
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function WriteDictionary: byte;
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function TryWriteDictionaryWithSize(nblocks: Byte): Boolean;
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public
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constructor createAr(const Aarfn:string);override;
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destructor destroy;override;
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@ -70,6 +84,28 @@ implementation
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libbufsize = 65536;
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objbufsize = 65536;
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{*****************************************************************************
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Helpers
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*****************************************************************************}
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function ModName2DictEntry(const modnm: string): string;
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begin
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if Copy(modnm,Length(modnm)-1,2)='.o' then
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Result:=Copy(modnm,1,Length(modnm)-2)+'!'
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else
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Result:=modnm;
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end;
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{*****************************************************************************
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TOmfLibDictionaryEntry
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*****************************************************************************}
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constructor TOmfLibDictionaryEntry.Create(HashObjectList: TFPHashObjectList; const aName: TSymStr; aPageNum: Word);
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begin
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inherited Create(HashObjectList,aName);
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PageNum:=aPageNum;
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end;
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{*****************************************************************************
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TOmfLibObjectWriter
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*****************************************************************************}
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@ -79,6 +115,7 @@ implementation
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FPageSize:=512;
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FLibName:=Aarfn;
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FLibData:=TDynamicArray.Create(libbufsize);
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FDictionary:=TFPHashObjectList.Create;
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{ header is at page 0, so first module starts at page 1 }
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FObjStartPage:=1;
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end;
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@ -90,6 +127,7 @@ implementation
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WriteLib;
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FLibData.Free;
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FObjData.Free;
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FDictionary.Free;
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inherited destroy;
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end;
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@ -107,12 +145,21 @@ implementation
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procedure TOmfLibObjectWriter.closefile;
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var
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RawRec: TOmfRawRecord;
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ObjHeader: TOmfRecord_THEADR;
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begin
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FLibData.seek(FObjStartPage*FPageSize);
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FObjData.seek(0);
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RawRec:=TOmfRawRecord.Create;
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repeat
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RawRec.ReadFrom(FObjData);
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if RawRec.RecordType=RT_THEADR then
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begin
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ObjHeader:=TOmfRecord_THEADR.Create;
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ObjHeader.DecodeFrom(RawRec);
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{ create a dictionary entry with the module name }
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TOmfLibDictionaryEntry.Create(FDictionary,ModName2DictEntry(ObjHeader.ModuleName),FObjStartPage);
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ObjHeader.Free;
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end;
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RawRec.WriteTo(FLibData);
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until RawRec.RecordType in [RT_MODEND,RT_MODEND32];
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RawRec.Free;
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@ -124,7 +171,7 @@ implementation
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procedure TOmfLibObjectWriter.writesym(const sym: string);
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begin
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inherited writesym(sym);
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TOmfLibDictionaryEntry.Create(FDictionary,sym,FObjStartPage);
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end;
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@ -174,6 +221,8 @@ implementation
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procedure TOmfLibObjectWriter.WriteLib;
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var
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libf: TCCustomFileStream;
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DictStart: LongWord;
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DictBlocks: Byte;
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begin
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libf:=CFileStreamClass.Create(FLibName,fmCreate);
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if CStreamError<>0 then
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@ -182,9 +231,95 @@ implementation
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exit;
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end;
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WriteFooter;
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WriteHeader(FLibData.Pos,2);
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DictStart:=FLibData.Pos;
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DictBlocks:=WriteDictionary;
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WriteHeader(DictStart,DictBlocks);
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FLibData.WriteStream(libf);
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libf.Free;
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end;
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function TOmfLibObjectWriter.WriteDictionary: Byte;
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var
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nb: Byte;
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begin
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for nb in OmfLibDictionaryBlockCounts do
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if TryWriteDictionaryWithSize(nb) then
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exit(nb);
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{ could not write dictionary, even with the largest number of blocks }
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internalerror(2015042201);
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end;
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function TOmfLibObjectWriter.TryWriteDictionaryWithSize(nblocks: Byte): Boolean;
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const
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nbuckets=37;
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freespace=nbuckets;
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type
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PBlock=^TBlock;
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TBlock=array[0..511] of byte;
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var
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blocks: array of TBlock;
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i: Integer;
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N: TSymStr;
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length_of_string: Integer;
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h: TOmfLibHash;
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start_block,start_bucket: Integer;
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space_required: Integer;
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pb: PBlock;
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success: Boolean;
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store_at: Integer;
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PageNum: Word;
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begin
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SetLength(blocks,nblocks);
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for i:=0 to nblocks-1 do
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begin
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FillChar(blocks[i],SizeOf(blocks[i]),0);
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blocks[i][freespace]:=(freespace+1) div 2;
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end;
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for i:=0 to FDictionary.Count-1 do
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begin
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N:=TOmfLibDictionaryEntry(FDictionary[i]).Name;
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PageNum:=TOmfLibDictionaryEntry(FDictionary[i]).PageNum;
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length_of_string:=Length(N);
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h:=compute_omf_lib_hash(N,nblocks);
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start_block:=h.block_x;
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start_bucket:=h.bucket_x;
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space_required:=1+length_of_string+2;
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if odd(space_required) then
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Inc(space_required);
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repeat
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pb:=@blocks[h.block_x];
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success:=false;
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repeat
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if pb^[h.bucket_x]=0 then
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begin
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if (512-pb^[freespace]*2)<space_required then
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break;
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pb^[h.bucket_x]:=pb^[freespace];
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store_at:=2*pb^[h.bucket_x];
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pb^[store_at]:=length_of_string;
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Move(N[1],pb^[store_at+1],length_of_string);
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pb^[store_at+1+length_of_string]:=Byte(PageNum);
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pb^[store_at+1+length_of_string+1]:=Byte(PageNum shr 8);
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Inc(pb^[freespace],space_required div 2);
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if pb^[freespace]=0 then
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pb^[freespace]:=255;
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success:=true;
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break;
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end;
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h.bucket_x:=(h.bucket_x+h.bucket_d) mod nbuckets;
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until h.bucket_x=start_bucket;
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if not success then
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begin
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h.block_x:=(h.block_x+h.block_d) mod nblocks;
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if h.block_x=start_block then
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exit(false); // not enough blocks
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pb^[freespace]:=255;
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end;
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until success;
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end;
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FLibData.write(blocks[0],nblocks*SizeOf(TBlock));
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Result:=true;
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end;
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end.
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