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793 lines
22 KiB
ObjectPascal
793 lines
22 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 by Florian Klaempfl
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This unit implements an abstract asmoutput class for all processor types
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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{ @abstract(This unit implements an abstract asm output class for all processor types)
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This unit implements an abstract assembler output class for all processors, these
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are then overriden for each assembler writer to actually write the data in these
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classes to an assembler file.
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}
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unit aasmbase;
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{$i fpcdefs.inc}
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interface
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uses
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cutils,cclasses,
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globtype,globals,systems;
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{ asm symbol functions }
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type
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TAsmsymbind=(AB_NONE,AB_EXTERNAL,AB_COMMON,AB_LOCAL,AB_GLOBAL);
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TAsmsymtype=(AT_NONE,AT_FUNCTION,AT_DATA,AT_SECTION);
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TAsmRelocationType = (RELOC_ABSOLUTE,RELOC_RELATIVE,RELOC_RVA);
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TAsmSectionSizes = array[TSection] of longint;
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TAsmSymbol = class(TNamedIndexItem)
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defbind,
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currbind : TAsmsymbind;
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typ : TAsmsymtype;
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{ the next fields are filled in the binary writer }
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section : TSection;
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address,
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size : longint;
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{ this need to be incremented with every symbol loading into the
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paasmoutput, thus in loadsym/loadref/const_symbol (PFV) }
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refs : longint;
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{# Alternate symbol which can be used for 'renaming' needed for
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inlining }
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altsymbol : tasmsymbol;
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objectdata : pointer;
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{# TRUE if the symbol is local for a procedure/function }
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proclocal : boolean;
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{# Is the symbol in the used list }
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inusedlist : boolean;
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{ assembler pass label is set, used for detecting multiple labels }
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pass : byte;
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constructor create(const s:string;_bind:TAsmsymbind;_typ:Tasmsymtype);
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procedure reset;
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function is_used:boolean;
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procedure setaddress(_pass:byte;sec:TSection;offset,len:longint);
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procedure GenerateAltSymbol;
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end;
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TAsmLabel = class(TAsmSymbol)
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{ this is set by the tai_label.Init }
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is_set,
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{ is the label only there for getting an address (e.g. for i/o }
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{ checks -> true) or is it a jump target (false) }
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is_addr : boolean;
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labelnr : longint;
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constructor create;
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constructor createdata;
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constructor createaddr;
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function getname:string;override;
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end;
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TAsmRelocation = class(TLinkedListItem)
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address,
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orgsize : longint; { original size of the symbol to relocate, required for COFF }
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symbol : tasmsymbol;
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section : TSection; { only used if symbol=nil }
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typ : TAsmRelocationType;
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constructor CreateSymbol(Aaddress:longint;s:Tasmsymbol;Atyp:TAsmRelocationType);
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constructor CreateSymbolSize(Aaddress:longint;s:Tasmsymbol;Aorgsize:longint;Atyp:TAsmRelocationType);
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constructor CreateSection(Aaddress:longint;sec:TSection;Atyp:TAsmRelocationType);
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end;
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TAsmSection = class(TLinkedListItem)
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name : string[32];
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secsymidx : longint; { index for the section in symtab }
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addralign : longint; { alignment of the section }
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flags : cardinal; { section flags }
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{ size of the data and in the file }
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dataalignbytes : longint;
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data : TDynamicArray;
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datasize : longint;
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datapos : longint;
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{ size and position in memory, set by seTSectionsize }
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memsize,
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mempos : longint;
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{ relocation }
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relocations : TLinkedList;
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constructor create(const Aname:string;Aalign:longint;alloconly:boolean);
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destructor destroy;override;
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function write(var d;l:longint):longint;
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function writestr(const s:string):longint;
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procedure writealign(l:longint);
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function aligneddatasize:longint;
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procedure alignsection;
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procedure alloc(l:longint);
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procedure addsymreloc(ofs:longint;p:tasmsymbol;relative:TAsmRelocationType);
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procedure addsectionreloc(ofs:longint;sec:TSection;relative:TAsmRelocationType);
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end;
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TAsmObjectData = class(TLinkedListItem)
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name : string[80];
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currsec : TSection;
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sects : array[TSection] of TAsmSection;
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symbols : tindexarray;
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constructor create(const n:string);
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destructor destroy;override;
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procedure createsection(sec:TSection);virtual;
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procedure defaulTSection(sec:TSection);
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function sectionsize(s:TSection):longint;
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function currsectionsize:longint;
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procedure seTSectionsizes(var s:TAsmSectionSizes);virtual;
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procedure alloc(len:longint);
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procedure allocalign(len:longint);
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procedure writebytes(var data;len:longint);
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procedure writereloc(data,len:longint;p:tasmsymbol;relative:TAsmRelocationType);virtual;abstract;
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procedure writesymbol(p:tasmsymbol);virtual;abstract;
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procedure writestabs(section:TSection;offset:longint;p:pchar;nidx,nother,line:longint;reloc:boolean);virtual;abstract;
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procedure writesymstabs(section:TSection;offset:longint;p:pchar;ps:tasmsymbol;nidx,nother,line:longint;reloc:boolean);virtual;abstract;
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procedure fixuprelocs;virtual;
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end;
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TAsmObjectAlloc = class
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currsec : TSection;
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secsize : TAsmSectionSizes;
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constructor create;
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destructor destroy;override;
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procedure seTSection(sec:TSection);
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function sectionsize:longint;
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procedure sectionalloc(l:longint);
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procedure sectionalign(l:longint);
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procedure staballoc(p:pchar);
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procedure reseTSections;
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end;
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TAsmObjectDataclass = class of TAsmObjectAlloc;
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var
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{ asm symbol list }
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asmsymbollist : tdictionary;
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usedasmsymbollist : tsinglelist;
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objectdata : TAsmObjectData;
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const
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nextaltnr : longint = 1;
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nextlabelnr : longint = 1;
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{# create a new assembler label }
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procedure getlabel(var l : tasmlabel);
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{ make l as a new label and flag is_addr }
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procedure getaddrlabel(var l : tasmlabel);
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{ make l as a new label and flag is_data }
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procedure getdatalabel(var l : tasmlabel);
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{# return a label number }
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procedure getlabelnr(var l : longint);
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function newasmsymbol(const s : string) : tasmsymbol;
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function newasmsymboltype(const s : string;_bind:TAsmSymBind;_typ:TAsmsymtype) : tasmsymbol;
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function getasmsymbol(const s : string) : tasmsymbol;
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function renameasmsymbol(const sold, snew : string):tasmsymbol;
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procedure CreateUsedAsmSymbolList;
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procedure DestroyUsedAsmSymbolList;
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procedure UsedAsmSymbolListInsert(p:tasmsymbol);
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procedure UsedAsmSymbolListReset;
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procedure UsedAsmSymbolListResetAltSym;
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procedure UsedAsmSymbolListCheckUndefined;
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implementation
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uses
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{$ifdef delphi}
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sysutils,
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{$else}
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strings,
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{$endif}
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fmodule,verbose;
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const
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symbolsgrow = 100;
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{*****************************************************************************
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TAsmSymbol
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*****************************************************************************}
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constructor tasmsymbol.create(const s:string;_bind:TAsmsymbind;_typ:Tasmsymtype);
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begin;
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inherited createname(s);
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reset;
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defbind:=_bind;
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typ:=_typ;
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inusedlist:=false;
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pass:=255;
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{ mainly used to remove unused labels from the codesegment }
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refs:=0;
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end;
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procedure tasmsymbol.GenerateAltSymbol;
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begin
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if not assigned(altsymbol) then
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begin
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altsymbol:=tasmsymbol.create(name+'_'+tostr(nextaltnr),defbind,typ);
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{ also copy the amount of references }
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altsymbol.refs:=refs;
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inc(nextaltnr);
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end;
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end;
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procedure tasmsymbol.reset;
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begin
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{ reset section info }
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section:=sec_none;
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address:=0;
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size:=0;
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indexnr:=-1;
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pass:=255;
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currbind:=AB_EXTERNAL;
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proclocal:=false;
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end;
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function tasmsymbol.is_used:boolean;
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begin
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is_used:=(refs>0);
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end;
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procedure tasmsymbol.setaddress(_pass:byte;sec:TSection;offset,len:longint);
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begin
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if (_pass=pass) then
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begin
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Message1(asmw_e_duplicate_label,name);
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exit;
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end;
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pass:=_pass;
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section:=sec;
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address:=offset;
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size:=len;
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{ when the bind was reset to External, set it back to the default
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bind it got when defined }
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if (currbind=AB_EXTERNAL) and (defbind<>AB_NONE) then
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currbind:=defbind;
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end;
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{*****************************************************************************
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TAsmLabel
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*****************************************************************************}
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constructor tasmlabel.create;
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begin;
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labelnr:=nextlabelnr;
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inc(nextlabelnr);
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inherited create(target_asm.labelprefix+tostr(labelnr),AB_LOCAL,AT_FUNCTION);
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proclocal:=true;
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is_set:=false;
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is_addr := false;
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end;
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constructor tasmlabel.createdata;
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begin;
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labelnr:=nextlabelnr;
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inc(nextlabelnr);
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if (cs_create_smart in aktmoduleswitches) or
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target_asm.labelprefix_only_inside_procedure then
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inherited create('_$'+current_module.modulename^+'$_L'+tostr(labelnr),AB_GLOBAL,AT_DATA)
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else
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inherited create(target_asm.labelprefix+tostr(labelnr),AB_LOCAL,AT_DATA);
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is_set:=false;
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is_addr := false;
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{ write it always }
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refs:=1;
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end;
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constructor tasmlabel.createaddr;
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begin;
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create;
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is_addr := true;
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end;
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function tasmlabel.getname:string;
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begin
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getname:=inherited getname;
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inc(refs);
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end;
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{****************************************************************************
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TAsmObjectAlloc
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****************************************************************************}
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constructor TAsmObjectAlloc.create;
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begin
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end;
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destructor TAsmObjectAlloc.destroy;
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begin
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end;
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procedure TAsmObjectAlloc.seTSection(sec:TSection);
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begin
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currsec:=sec;
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end;
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procedure TAsmObjectAlloc.reseTSections;
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begin
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FillChar(secsize,sizeof(secsize),0);
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end;
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procedure TAsmObjectAlloc.sectionalloc(l:longint);
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begin
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inc(secsize[currsec],l);
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end;
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procedure TAsmObjectAlloc.sectionalign(l:longint);
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begin
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if (secsize[currsec] mod l)<>0 then
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inc(secsize[currsec],l-(secsize[currsec] mod l));
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end;
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procedure TAsmObjectAlloc.staballoc(p:pchar);
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begin
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inc(secsize[sec_stab]);
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if assigned(p) and (p[0]<>#0) then
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inc(secsize[sec_stabstr],strlen(p)+1);
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end;
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function TAsmObjectAlloc.sectionsize:longint;
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begin
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sectionsize:=secsize[currsec];
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end;
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{****************************************************************************
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TAsmRelocation
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****************************************************************************}
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constructor TAsmRelocation.CreateSymbol(Aaddress:longint;s:Tasmsymbol;Atyp:TAsmRelocationType);
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begin
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Address:=Aaddress;
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Symbol:=s;
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OrgSize:=0;
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Section:=Sec_none;
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Typ:=Atyp;
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end;
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constructor TAsmRelocation.CreateSymbolSize(Aaddress:longint;s:Tasmsymbol;Aorgsize:longint;Atyp:TAsmRelocationType);
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begin
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Address:=Aaddress;
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Symbol:=s;
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OrgSize:=Aorgsize;
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Section:=Sec_none;
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Typ:=Atyp;
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end;
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constructor TAsmRelocation.CreateSection(Aaddress:longint;sec:TSection;Atyp:TAsmRelocationType);
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begin
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Address:=Aaddress;
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Symbol:=nil;
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OrgSize:=0;
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Section:=sec;
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Typ:=Atyp;
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end;
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{****************************************************************************
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TAsmSection
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****************************************************************************}
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constructor TAsmSection.create(const Aname:string;Aalign:longint;alloconly:boolean);
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begin
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inherited create;
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name:=Aname;
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secsymidx:=0;
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addralign:=Aalign;
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{ data }
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datasize:=0;
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datapos:=0;
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if alloconly then
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data:=nil
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else
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Data:=TDynamicArray.Create(8192);
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{ position }
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mempos:=0;
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memsize:=0;
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{ relocation }
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relocations:=TLinkedList.Create;
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end;
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destructor TAsmSection.destroy;
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begin
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if assigned(Data) then
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Data.Free;
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end;
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function TAsmSection.write(var d;l:longint):longint;
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begin
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write:=datasize;
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if not assigned(Data) then
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Internalerror(3334441);
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Data.write(d,l);
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inc(datasize,l);
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end;
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function TAsmSection.writestr(const s:string):longint;
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begin
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writestr:=datasize;
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if not assigned(Data) then
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Internalerror(3334441);
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Data.write(s[1],length(s));
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inc(datasize,length(s));
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end;
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procedure TAsmSection.writealign(l:longint);
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var
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i : longint;
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empty : array[0..63] of char;
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begin
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{ no alignment needed for 0 or 1 }
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if l<=1 then
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exit;
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i:=datasize mod l;
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if i>0 then
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begin
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if assigned(data) then
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begin
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fillchar(empty,sizeof(empty),0);
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Data.write(empty,l-i);
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end;
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inc(datasize,l-i);
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end;
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end;
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function TAsmSection.aligneddatasize:longint;
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begin
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aligneddatasize:=align(datasize,addralign);
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end;
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procedure TAsmSection.alignsection;
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begin
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writealign(addralign);
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end;
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procedure TAsmSection.alloc(l:longint);
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begin
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if assigned(Data) then
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Internalerror(3334442);
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inc(datasize,l);
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end;
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procedure TAsmSection.addsymreloc(ofs:longint;p:tasmsymbol;relative:TAsmRelocationType);
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var
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r : TAsmRelocation;
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begin
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r:=TAsmRelocation.Create;
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r.address:=ofs;
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r.orgsize:=0;
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r.symbol:=p;
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r.section:=sec_none;
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r.typ:=relative;
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relocations.concat(r);
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end;
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procedure TAsmSection.addsectionreloc(ofs:longint;sec:TSection;relative:TAsmRelocationType);
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var
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r : TAsmRelocation;
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begin
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r:=TAsmRelocation.Create;
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r.address:=ofs;
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r.symbol:=nil;
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r.orgsize:=0;
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r.section:=sec;
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r.typ:=relative;
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relocations.concat(r);
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end;
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{****************************************************************************
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TAsmObjectData
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****************************************************************************}
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constructor TAsmObjectData.create(const n:string);
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begin
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inherited create;
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name:=n;
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{ sections }
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FillChar(Sects,sizeof(Sects),0);
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{ symbols }
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symbols:=tindexarray.create(symbolsgrow);
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symbols.noclear:=true;
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end;
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destructor TAsmObjectData.destroy;
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var
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sec : TSection;
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begin
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{ free memory }
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for sec:=low(TSection) to high(TSection) do
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if assigned(sects[sec]) then
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sects[sec].free;
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symbols.free;
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end;
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procedure TAsmObjectData.createsection(sec:TSection);
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begin
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sects[sec]:=TAsmSection.create(target_asm.secnames[sec],1,(sec=sec_bss));
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end;
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function TAsmObjectData.sectionsize(s:TSection):longint;
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begin
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if assigned(sects[s]) then
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sectionsize:=sects[s].datasize
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else
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sectionsize:=0;
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end;
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function TAsmObjectData.currsectionsize:longint;
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begin
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if assigned(sects[currsec]) then
|
|
currsectionsize:=sects[currsec].datasize
|
|
else
|
|
currsectionsize:=0;
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.seTSectionsizes(var s:TAsmSectionSizes);
|
|
begin
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.defaulTSection(sec:TSection);
|
|
begin
|
|
currsec:=sec;
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.writebytes(var data;len:longint);
|
|
begin
|
|
if not assigned(sects[currsec]) then
|
|
createsection(currsec);
|
|
sects[currsec].write(data,len);
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.alloc(len:longint);
|
|
begin
|
|
if not assigned(sects[currsec]) then
|
|
createsection(currsec);
|
|
sects[currsec].alloc(len);
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.allocalign(len:longint);
|
|
var
|
|
modulo : longint;
|
|
begin
|
|
if not assigned(sects[currsec]) then
|
|
createsection(currsec);
|
|
modulo:=sects[currsec].datasize mod len;
|
|
if modulo > 0 then
|
|
sects[currsec].alloc(len-modulo);
|
|
end;
|
|
|
|
|
|
procedure TAsmObjectData.fixuprelocs;
|
|
begin
|
|
{ no relocation support by default }
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
AsmSymbolList helpers
|
|
*****************************************************************************}
|
|
|
|
function newasmsymbol(const s : string) : tasmsymbol;
|
|
var
|
|
hp : tasmsymbol;
|
|
begin
|
|
hp:=tasmsymbol(asmsymbollist.search(s));
|
|
if not assigned(hp) then
|
|
begin
|
|
{ Not found, insert it as an External }
|
|
hp:=tasmsymbol.create(s,AB_EXTERNAL,AT_FUNCTION);
|
|
asmsymbollist.insert(hp);
|
|
end;
|
|
newasmsymbol:=hp;
|
|
end;
|
|
|
|
|
|
function newasmsymboltype(const s : string;_bind:TAsmSymBind;_typ:Tasmsymtype) : tasmsymbol;
|
|
var
|
|
hp : tasmsymbol;
|
|
begin
|
|
hp:=tasmsymbol(asmsymbollist.search(s));
|
|
if assigned(hp) then
|
|
hp.defbind:=_bind
|
|
else
|
|
begin
|
|
{ Not found, insert it as an External }
|
|
hp:=tasmsymbol.create(s,_bind,_typ);
|
|
asmsymbollist.insert(hp);
|
|
end;
|
|
newasmsymboltype:=hp;
|
|
end;
|
|
|
|
|
|
function getasmsymbol(const s : string) : tasmsymbol;
|
|
begin
|
|
getasmsymbol:=tasmsymbol(asmsymbollist.search(s));
|
|
end;
|
|
|
|
|
|
{ renames an asmsymbol }
|
|
function renameasmsymbol(const sold, snew : string):tasmsymbol;
|
|
begin
|
|
renameasmsymbol:=tasmsymbol(asmsymbollist.rename(sold,snew));
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
Used AsmSymbolList
|
|
*****************************************************************************}
|
|
|
|
procedure CreateUsedAsmSymbolList;
|
|
begin
|
|
if assigned(usedasmsymbollist) then
|
|
internalerror(78455782);
|
|
usedasmsymbollist:=TSingleList.create;
|
|
end;
|
|
|
|
|
|
procedure DestroyUsedAsmSymbolList;
|
|
begin
|
|
usedasmsymbollist.destroy;
|
|
usedasmsymbollist:=nil;
|
|
end;
|
|
|
|
|
|
procedure UsedAsmSymbolListInsert(p:tasmsymbol);
|
|
begin
|
|
if not p.inusedlist then
|
|
usedasmsymbollist.insert(p);
|
|
p.inusedlist:=true;
|
|
end;
|
|
|
|
|
|
procedure UsedAsmSymbolListReset;
|
|
var
|
|
hp : tasmsymbol;
|
|
begin
|
|
hp:=tasmsymbol(usedasmsymbollist.first);
|
|
while assigned(hp) do
|
|
begin
|
|
with hp do
|
|
begin
|
|
reset;
|
|
inusedlist:=false;
|
|
end;
|
|
hp:=tasmsymbol(hp.listnext);
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure UsedAsmSymbolListResetAltSym;
|
|
var
|
|
hp : tasmsymbol;
|
|
begin
|
|
hp:=tasmsymbol(usedasmsymbollist.first);
|
|
while assigned(hp) do
|
|
begin
|
|
with hp do
|
|
begin
|
|
altsymbol:=nil;
|
|
inusedlist:=false;
|
|
end;
|
|
hp:=tasmsymbol(hp.listnext);
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure UsedAsmSymbolListCheckUndefined;
|
|
var
|
|
hp : tasmsymbol;
|
|
begin
|
|
hp:=tasmsymbol(usedasmsymbollist.first);
|
|
while assigned(hp) do
|
|
begin
|
|
with hp do
|
|
begin
|
|
if (refs>0) and
|
|
(section=Sec_none) and
|
|
not(currbind in [AB_EXTERNAL,AB_COMMON]) then
|
|
Message1(asmw_e_undefined_label,name);
|
|
end;
|
|
hp:=tasmsymbol(hp.listnext);
|
|
end;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
Label Helpers
|
|
*****************************************************************************}
|
|
|
|
procedure getlabel(var l : tasmlabel);
|
|
begin
|
|
l:=tasmlabel.create;
|
|
asmsymbollist.insert(l);
|
|
end;
|
|
|
|
|
|
procedure getdatalabel(var l : tasmlabel);
|
|
begin
|
|
l:=tasmlabel.createdata;
|
|
asmsymbollist.insert(l);
|
|
end;
|
|
|
|
procedure getaddrlabel(var l : tasmlabel);
|
|
begin
|
|
l:=tasmlabel.createaddr;
|
|
asmsymbollist.insert(l);
|
|
end;
|
|
|
|
procedure getlabelnr(var l : longint);
|
|
begin
|
|
l:=nextlabelnr;
|
|
inc(nextlabelnr);
|
|
end;
|
|
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.2 2002-07-07 09:52:32 florian
|
|
* powerpc target fixed, very simple units can be compiled
|
|
* some basic stuff for better callparanode handling, far from being finished
|
|
|
|
Revision 1.1 2002/07/01 18:46:20 peter
|
|
* internal linker
|
|
* reorganized aasm layer
|
|
|
|
}
|