paweld/fpc
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/fpc/source.git synced 2025-11-04 03:39:40 +01:00
Code Issues Packages Projects Releases Wiki Activity

+ basic GNU assembler writer class

Browse Source
This commit is contained in:
carl 2002-04-14 16:51:54 +00:00
parent afbc9a1935
commit 4c1cbe5c2b
1 changed files with 802 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

802
compiler/aggas.pas Normal file
View File

@ -0,0 +1,802 @@
{
$Id$
Copyright (c) 1998-2002 by the Free Pascal team
This unit implements generic GNU assembler (v2.8 or later)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
{# Base unit for writing GNU assembler output.
}
unit aggas;
{$i defines.inc}
interface
uses
cclasses,
globals,
aasm,assemble;
type
{# This is a derived class which is used to write
GAS styled assembler.
The WriteInstruction() method must be overriden
to write a single instruction to the assembler
file.
}
TGNUAssembler=class(texternalassembler)
public
procedure WriteTree(p:TAAsmoutput);override;
procedure WriteAsmList;override;
{$ifdef GDB}
procedure WriteFileLineInfo(var fileinfo : tfileposinfo);
procedure WriteFileEndInfo;
{$endif}
procedure WriteInstruction(hp: tai); virtual; abstract;
end;
implementation
uses
{$ifdef Delphi}
dmisc,
{$else Delphi}
dos,
{$endif Delphi}
cutils,globtype,systems,
fmodule,finput,verbose,cpubase,cpuasm,tainst
{$ifdef GDB}
{$ifdef delphi}
,sysutils
{$else}
,strings
{$endif}
,gdb
{$endif GDB}
;
const
line_length = 70;
var
{$ifdef GDB}
n_line : byte; { different types of source lines }
linecount,
includecount : longint;
funcname : pchar;
stabslastfileinfo : tfileposinfo;
{$endif}
lastsec : tsection; { last section type written }
lastfileinfo : tfileposinfo;
infile,
lastinfile : tinputfile;
symendcount : longint;
type
t80bitarray = array[0..9] of byte;
t64bitarray = array[0..7] of byte;
t32bitarray = array[0..3] of byte;
{****************************************************************************}
{ Support routines }
{****************************************************************************}
function fixline(s:string):string;
{
return s with all leading and ending spaces and tabs removed
}
var
i,j,k : integer;
begin
i:=length(s);
while (i>0) and (s[i] in [#9,' ']) do
dec(i);
j:=1;
while (j<i) and (s[j] in [#9,' ']) do
inc(j);
for k:=j to i do
if s[k] in [#0..#31,#127..#255] then
s[k]:='.';
fixline:=Copy(s,j,i-j+1);
end;
function single2str(d : single) : string;
var
hs : string;
begin
str(d,hs);
{ replace space with + }
if hs[1]=' ' then
hs[1]:='+';
single2str:='0d'+hs
end;
function double2str(d : double) : string;
var
hs : string;
begin
str(d,hs);
{ replace space with + }
if hs[1]=' ' then
hs[1]:='+';
double2str:='0d'+hs
end;
function extended2str(e : extended) : string;
var
hs : string;
begin
str(e,hs);
{ replace space with + }
if hs[1]=' ' then
hs[1]:='+';
extended2str:='0d'+hs
end;
{ convert floating point values }
{ to correct endian }
procedure swap64bitarray(var t: t64bitarray);
var
b: byte;
begin
b:= t[7];
t[7] := t[0];
t[0] := b;
b := t[6];
t[6] := t[1];
t[1] := b;
b:= t[5];
t[5] := t[2];
t[2] := b;
b:= t[4];
t[4] := t[3];
t[3] := b;
end;
procedure swap32bitarray(var t: t32bitarray);
var
b: byte;
begin
b:= t[1];
t[1]:= t[2];
t[2]:= b;
b:= t[0];
t[0]:= t[3];
t[3]:= b;
end;
procedure swap80bitarray(var t: t80bitarray);
begin
{!!!!!!!!!!!!}
end;
const
ait_const2str : array[ait_const_32bit..ait_const_8bit] of string[8]=
(#9'.long'#9,#9'.short'#9,#9'.byte'#9);
function ait_section2str(s:tsection):string;
begin
ait_section2str:=target_asm.secnames[s];
{$ifdef GDB}
{ this is needed for line info in data }
funcname:=nil;
case s of
sec_code : n_line:=n_textline;
sec_data : n_line:=n_dataline;
sec_bss : n_line:=n_bssline;
else n_line:=n_dataline;
end;
{$endif GDB}
LastSec:=s;
end;
{****************************************************************************}
{ GNU Assembler writer }
{****************************************************************************}
{$ifdef GDB}
procedure TGNUAssembler.WriteFileLineInfo(var fileinfo : tfileposinfo);
var
curr_n : byte;
begin
if not ((cs_debuginfo in aktmoduleswitches) or
(cs_gdb_lineinfo in aktglobalswitches)) then
exit;
{ file changed ? (must be before line info) }
if (fileinfo.fileindex<>0) and
(stabslastfileinfo.fileindex<>fileinfo.fileindex) then
begin
infile:=current_module.sourcefiles.get_file(fileinfo.fileindex);
if assigned(infile) then
begin
if includecount=0 then
curr_n:=n_sourcefile
else
curr_n:=n_includefile;
if (infile.path^<>'') then
begin
AsmWriteLn(#9'.stabs "'+lower(BsToSlash(FixPath(infile.path^,false)))+'",'+
tostr(curr_n)+',0,0,'+'Ltext'+ToStr(IncludeCount));
end;
AsmWriteLn(#9'.stabs "'+lower(FixFileName(infile.name^))+'",'+
tostr(curr_n)+',0,0,'+'Ltext'+ToStr(IncludeCount));
AsmWriteLn('Ltext'+ToStr(IncludeCount)+':');
inc(includecount);
end;
end;
{ line changed ? }
if (stabslastfileinfo.line<>fileinfo.line) and (fileinfo.line<>0) then
begin
if (n_line=n_textline) and assigned(funcname) and
(target_info.use_function_relative_addresses) then
begin
AsmWriteLn(target_asm.labelprefix+'l'+tostr(linecount)+':');
AsmWrite(#9'.stabn '+tostr(n_line)+',0,'+tostr(fileinfo.line)+','+
target_asm.labelprefix+'l'+tostr(linecount)+' - ');
AsmWritePChar(FuncName);
AsmLn;
inc(linecount);
end
else
AsmWriteLn(#9'.stabd'#9+tostr(n_line)+',0,'+tostr(fileinfo.line));
end;
stabslastfileinfo:=fileinfo;
end;
procedure TGNUAssembler.WriteFileEndInfo;
begin
if not ((cs_debuginfo in aktmoduleswitches) or
(cs_gdb_lineinfo in aktglobalswitches)) then
exit;
AsmLn;
AsmWriteLn(ait_section2str(sec_code));
AsmWriteLn(#9'.stabs "",'+tostr(n_sourcefile)+',0,0,Letext');
AsmWriteLn('Letext:');
end;
{$endif GDB}
procedure TGNUAssembler.WriteTree(p:TAAsmoutput);
const
allocstr : array[boolean] of string[10]=(' released',' allocated');
nolinetai =[ait_label,
ait_regalloc,ait_tempalloc,
ait_stabn,ait_stabs,ait_section,
ait_cut,ait_marker,ait_align,ait_stab_function_name];
type
t80bitarray = array[0..9] of byte;
t64bitarray = array[0..7] of byte;
t32bitarray = array[0..3] of byte;
var
ch : char;
hp : tai;
consttyp : tait;
s : string;
found : boolean;
i,pos,l : longint;
InlineLevel : longint;
co : comp;
sin : single;
d : double;
e : extended;
do_line : boolean;
sep : char;
begin
if not assigned(p) then
exit;
InlineLevel:=0;
{ lineinfo is only needed for codesegment (PFV) }
do_line:=(cs_asm_source in aktglobalswitches) or
((cs_lineinfo in aktmoduleswitches)
and (p=codesegment));
hp:=tai(p.first);
while assigned(hp) do
begin
aktfilepos:=hp.fileinfo;
if not(hp.typ in nolinetai) then
begin
{$ifdef GDB}
{ write stabs }
if (cs_debuginfo in aktmoduleswitches) or
(cs_gdb_lineinfo in aktglobalswitches) then
WriteFileLineInfo(hp.fileinfo);
{$endif GDB}
if do_line then
begin
{ load infile }
if lastfileinfo.fileindex<>hp.fileinfo.fileindex then
begin
infile:=current_module.sourcefiles.get_file(hp.fileinfo.fileindex);
if assigned(infile) then
begin
{ open only if needed !! }
if (cs_asm_source in aktglobalswitches) then
infile.open;
end;
{ avoid unnecessary reopens of the same file !! }
lastfileinfo.fileindex:=hp.fileinfo.fileindex;
{ be sure to change line !! }
lastfileinfo.line:=-1;
end;
{ write source }
if (cs_asm_source in aktglobalswitches) and
assigned(infile) then
begin
if (infile<>lastinfile) then
begin
AsmWriteLn(target_asm.comment+'['+infile.name^+']');
if assigned(lastinfile) then
lastinfile.close;
end;
if (hp.fileinfo.line<>lastfileinfo.line) and
((hp.fileinfo.line<infile.maxlinebuf) or (InlineLevel>0)) then
begin
if (hp.fileinfo.line<>0) and
((infile.linebuf^[hp.fileinfo.line]>=0) or (InlineLevel>0)) then
AsmWriteLn(target_asm.comment+'['+tostr(hp.fileinfo.line)+'] '+
fixline(infile.GetLineStr(hp.fileinfo.line)));
{ set it to a negative value !
to make that is has been read already !! PM }
if (infile.linebuf^[hp.fileinfo.line]>=0) then
infile.linebuf^[hp.fileinfo.line]:=-infile.linebuf^[hp.fileinfo.line]-1;
end;
end;
lastfileinfo:=hp.fileinfo;
lastinfile:=infile;
end;
end;
case hp.typ of
ait_comment :
Begin
AsmWrite(target_asm.comment);
AsmWritePChar(tai_asm_comment(hp).str);
AsmLn;
End;
ait_regalloc :
begin
if (cs_asm_regalloc in aktglobalswitches) then
AsmWriteLn(target_asm.comment+'Register '+gas_reg2str[tairegalloc(hp).reg]+
allocstr[tairegalloc(hp).allocation]);
end;
ait_tempalloc :
begin
if (cs_asm_tempalloc in aktglobalswitches) then
AsmWriteLn(target_asm.comment+'Temp '+tostr(taitempalloc(hp).temppos)+','+
tostr(taitempalloc(hp).tempsize)+allocstr[taitempalloc(hp).allocation]);
end;
ait_align :
begin
AsmWrite(#9'.balign '+tostr(tai_align(hp).aligntype));
if tai_align(hp).use_op then
AsmWrite(','+tostr(tai_align(hp).fillop));
AsmLn;
end;
ait_section :
begin
if tai_section(hp).sec<>sec_none then
begin
AsmLn;
AsmWriteLn(ait_section2str(tai_section(hp).sec));
{$ifdef GDB}
lastfileinfo.line:=-1;
{$endif GDB}
end;
end;
ait_datablock :
begin
if tai_datablock(hp).is_global then
AsmWrite(#9'.comm'#9)
else
AsmWrite(#9'.lcomm'#9);
AsmWrite(tai_datablock(hp).sym.name);
AsmWriteLn(','+tostr(tai_datablock(hp).size));
end;
ait_const_32bit,
ait_const_16bit,
ait_const_8bit :
begin
AsmWrite(ait_const2str[hp.typ]+tostr(tai_const(hp).value));
consttyp:=hp.typ;
l:=0;
repeat
found:=(not (tai(hp.next)=nil)) and (tai(hp.next).typ=consttyp);
if found then
begin
hp:=tai(hp.next);
s:=','+tostr(tai_const(hp).value);
AsmWrite(s);
inc(l,length(s));
end;
until (not found) or (l>line_length);
AsmLn;
end;
ait_const_symbol :
begin
AsmWrite(#9'.long'#9+tai_const_symbol(hp).sym.name);
if tai_const_symbol(hp).offset>0 then
AsmWrite('+'+tostr(tai_const_symbol(hp).offset))
else if tai_const_symbol(hp).offset<0 then
AsmWrite(tostr(tai_const_symbol(hp).offset));
AsmLn;
end;
ait_const_rva :
AsmWriteLn(#9'.rva'#9+tai_const_symbol(hp).sym.name);
ait_real_80bit :
begin
if do_line then
AsmWriteLn(target_asm.comment+extended2str(tai_real_80bit(hp).value));
{ Make sure e is a extended type, bestreal could be
a different type (bestreal) !! (PFV) }
e:=tai_real_80bit(hp).value;
AsmWrite(#9'.byte'#9);
for i:=0 to 9 do
begin
if i<>0 then
AsmWrite(',');
AsmWrite(tostr(t80bitarray(e)[i]));
end;
AsmLn;
end;
ait_real_64bit :
begin
if do_line then
AsmWriteLn(target_asm.comment+double2str(tai_real_64bit(hp).value));
d:=tai_real_64bit(hp).value;
{ swap the values to correct endian if required }
if source_info.endian <> target_info.endian then
swap64bitarray(t64bitarray(d));
AsmWrite(#9'.byte'#9);
for i:=0 to 7 do
begin
if i<>0 then
AsmWrite(',');
AsmWrite(tostr(t64bitarray(d)[i]));
end;
AsmLn;
end;
ait_real_32bit :
begin
if do_line then
AsmWriteLn(target_asm.comment+single2str(tai_real_32bit(hp).value));
sin:=tai_real_32bit(hp).value;
{ swap the values to correct endian if required }
if source_info.endian <> target_info.endian then
swap32bitarray(t32bitarray(sin));
AsmWrite(#9'.byte'#9);
for i:=0 to 3 do
begin
if i<>0 then
AsmWrite(',');
AsmWrite(tostr(t32bitarray(sin)[i]));
end;
AsmLn;
end;
ait_comp_64bit :
begin
if do_line then
AsmWriteLn(target_asm.comment+extended2str(tai_comp_64bit(hp).value));
AsmWrite(#9'.byte'#9);
{$ifdef FPC}
co:=comp(tai_comp_64bit(hp).value);
{$else}
co:=tai_comp_64bit(hp).value;
{$endif}
{ swap the values to correct endian if required }
if source_info.endian <> target_info.endian then
swap64bitarray(t64bitarray(co));
for i:=0 to 7 do
begin
if i<>0 then
AsmWrite(',');
AsmWrite(tostr(t64bitarray(co)[i]));
end;
AsmLn;
end;
ait_direct :
begin
AsmWritePChar(tai_direct(hp).str);
AsmLn;
{$IfDef GDB}
if strpos(tai_direct(hp).str,'.data')<>nil then
n_line:=n_dataline
else if strpos(tai_direct(hp).str,'.text')<>nil then
n_line:=n_textline
else if strpos(tai_direct(hp).str,'.bss')<>nil then
n_line:=n_bssline;
{$endif GDB}
end;
ait_string :
begin
pos:=0;
for i:=1 to tai_string(hp).len do
begin
if pos=0 then
begin
AsmWrite(#9'.ascii'#9'"');
pos:=20;
end;
ch:=tai_string(hp).str[i-1];
case ch of
#0, {This can't be done by range, because a bug in FPC}
#1..#31,
#128..#255 : s:='\'+tostr(ord(ch) shr 6)+tostr((ord(ch) and 63) shr 3)+tostr(ord(ch) and 7);
'"' : s:='\"';
'\' : s:='\\';
else
s:=ch;
end;
AsmWrite(s);
inc(pos,length(s));
if (pos>line_length) or (i=tai_string(hp).len) then
begin
AsmWriteLn('"');
pos:=0;
end;
end;
end;
ait_label :
begin
if (tai_label(hp).l.is_used) then
begin
if tai_label(hp).l.defbind=AB_GLOBAL then
begin
AsmWrite('.globl'#9);
AsmWriteLn(tai_label(hp).l.name);
end;
AsmWrite(tai_label(hp).l.name);
AsmWriteLn(':');
end;
end;
ait_symbol :
begin
if tai_symbol(hp).is_global then
begin
AsmWrite('.globl'#9);
AsmWriteLn(tai_symbol(hp).sym.name);
end;
if target_info.target in [target_i386_linux,target_i386_beos] then
begin
AsmWrite(#9'.type'#9);
AsmWrite(tai_symbol(hp).sym.name);
if assigned(tai(hp.next)) and
(tai(hp.next).typ in [ait_const_symbol,ait_const_rva,
ait_const_32bit,ait_const_16bit,ait_const_8bit,ait_datablock,
ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit]) then
AsmWriteLn(',@object')
else
AsmWriteLn(',@function');
if tai_symbol(hp).sym.size>0 then
begin
AsmWrite(#9'.size'#9);
AsmWrite(tai_symbol(hp).sym.name);
AsmWrite(', ');
AsmWriteLn(tostr(tai_symbol(hp).sym.size));
end;
end;
AsmWrite(tai_symbol(hp).sym.name);
AsmWriteLn(':');
end;
ait_symbol_end :
begin
if target_info.target in [target_i386_linux,target_i386_beos] then
begin
s:=target_asm.labelprefix+'e'+tostr(symendcount);
inc(symendcount);
AsmWriteLn(s+':');
AsmWrite(#9'.size'#9);
AsmWrite(tai_symbol_end(hp).sym.name);
AsmWrite(', '+s+' - ');
AsmWriteLn(tai_symbol_end(hp).sym.name);
end;
end;
ait_instruction :
begin
WriteInstruction(hp);
end;
{$ifdef GDB}
ait_stabs :
begin
AsmWrite(#9'.stabs ');
AsmWritePChar(tai_stabs(hp).str);
AsmLn;
end;
ait_stabn :
begin
AsmWrite(#9'.stabn ');
AsmWritePChar(tai_stabn(hp).str);
AsmLn;
end;
ait_force_line :
stabslastfileinfo.line:=0;
ait_stab_function_name:
funcname:=tai_stab_function_name(hp).str;
{$endif GDB}
ait_cut :
begin
if SmartAsm then
begin
{ only reset buffer if nothing has changed }
if AsmSize=AsmStartSize then
AsmClear
else
begin
AsmClose;
DoAssemble;
AsmCreate(tai_cut(hp).place);
end;
{ avoid empty files }
while assigned(hp.next) and (tai(hp.next).typ in [ait_cut,ait_section,ait_comment]) do
begin
if tai(hp.next).typ=ait_section then
lastsec:=tai_section(hp.next).sec;
hp:=tai(hp.next);
end;
{$ifdef GDB}
{ force write of filename }
FillChar(stabslastfileinfo,sizeof(stabslastfileinfo),0);
includecount:=0;
funcname:=nil;
WriteFileLineInfo(hp.fileinfo);
{$endif GDB}
if lastsec<>sec_none then
AsmWriteLn(ait_section2str(lastsec));
AsmStartSize:=AsmSize;
end;
end;
ait_marker :
if tai_marker(hp).kind=InlineStart then
inc(InlineLevel)
else if tai_marker(hp).kind=InlineEnd then
dec(InlineLevel);
else
internalerror(10000);
end;
hp:=tai(hp.next);
end;
end;
procedure TGNUAssembler.WriteAsmList;
var
p:dirstr;
n:namestr;
e:extstr;
{$ifdef GDB}
fileinfo : tfileposinfo;
{$endif GDB}
begin
{$ifdef EXTDEBUG}
if assigned(current_module.mainsource) then
Comment(v_info,'Start writing gas-styled assembler output for '+current_module.mainsource^);
{$endif}
LastSec:=sec_none;
{$ifdef GDB}
FillChar(stabslastfileinfo,sizeof(stabslastfileinfo),0);
{$endif GDB}
FillChar(lastfileinfo,sizeof(lastfileinfo),0);
LastInfile:=nil;
if assigned(current_module.mainsource) then
fsplit(current_module.mainsource^,p,n,e)
else
begin
p:=inputdir;
n:=inputfile;
e:=inputextension;
end;
{ to get symify to work }
AsmWriteLn(#9'.file "'+FixFileName(n+e)+'"');
{$ifdef GDB}
n_line:=n_bssline;
funcname:=nil;
linecount:=1;
includecount:=0;
fileinfo.fileindex:=1;
fileinfo.line:=1;
{ Write main file }
WriteFileLineInfo(fileinfo);
{$endif GDB}
AsmStartSize:=AsmSize;
symendcount:=0;
countlabelref:=false;
If (cs_debuginfo in aktmoduleswitches) then
WriteTree(debuglist);
WriteTree(codesegment);
WriteTree(datasegment);
WriteTree(consts);
WriteTree(rttilist);
Writetree(resourcestringlist);
WriteTree(bsssegment);
Writetree(importssection);
{ exports are written by DLLTOOL
if we use it so don't insert it twice (PM) }
if not UseDeffileForExport and assigned(exportssection) then
Writetree(exportssection);
Writetree(resourcesection);
{$ifdef GDB}
WriteFileEndInfo;
{$ENDIF}
countlabelref:=true;
AsmLn;
{$ifdef EXTDEBUG}
if assigned(current_module.mainsource) then
comment(v_info,'Done writing gas-styled assembler output for '+current_module.mainsource^);
{$endif EXTDEBUG}
end;
end.
{
$Log$
Revision 1.1 2002-04-14 16:51:54 carl
+ basic GNU assembler writer class
}