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{
Copyright (c) 1998-2002 by Florian Klaempfl
Information about the current procedure that is being compiled
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.
****************************************************************************
}
unit procinfo;
{$i fpcdefs.inc}
interface
uses
{ common }
cclasses,
{ global }
globtype,globals,verbose,
{ symtable }
symconst,symtype,symdef,symsym,
{ aasm }
cpubase,cpuinfo,cgbase,cgutils,
aasmbase,aasmtai,aasmdata,
optutils
;
const
inherited_inlining_flags : tprocinfoflags =
[pi_do_call,
{ the stack frame can't be removed in this case }
pi_has_assembler_block,
pi_uses_exceptions];
type
{# This object gives information on the current routine being
compiled.
}
tprocinfo = class(tlinkedlistitem)
{ pointer to parent in nested procedures }
parent : tprocinfo;
{# the definition of the routine itself }
procdef : tprocdef;
{ procinfo of the main procedure that is inlining
the current function, only used in tcgcallnode.inlined_pass2 }
inlining_procinfo : tprocinfo;
{ file location of begin of procedure }
entrypos : tfileposinfo;
{ file location of end of procedure }
exitpos : tfileposinfo;
{ local switches at begin of procedure }
entryswitches : tlocalswitches;
{ local switches at end of procedure }
exitswitches : tlocalswitches;
{ Size of the parameters on the stack }
para_stack_size : pint;
{ Offset of temp after para/local are allocated }
tempstart : longint;
{# some collected informations about the procedure
see pi_xxxx constants above
}
flags : tprocinfoflags;
{ register used as frame pointer }
framepointer : tregister;
{ register containing currently the got }
got : tregister;
CurrGOTLabel : tasmlabel;
{ Holds the reference used to store all saved registers. }
save_regs_ref : treference;
{ Labels for TRUE/FALSE condition, BREAK and CONTINUE }
CurrBreakLabel,
CurrContinueLabel,
CurrTrueLabel,
CurrFalseLabel : tasmlabel;
{ label to leave the sub routine }
CurrExitLabel : tasmlabel;
{# The code for the routine itself, excluding entry and
exit code. This is a linked list of tai classes.
}
aktproccode : TAsmList;
{ Data (like jump tables) that belongs to this routine }
aktlocaldata : TAsmList;
{ max. of space need for parameters }
maxpushedparasize : aint;
constructor create(aparent:tprocinfo);virtual;
destructor destroy;override;
procedure allocate_push_parasize(size:longint);
function calc_stackframe_size:longint;virtual;
{ Set the address of the first temp, can be used to allocate
space for pushing parameters }
procedure set_first_temp_offset;virtual;
{ Generate parameter information }
procedure generate_parameter_info;virtual;
{ Allocate got register }
procedure allocate_got_register(list: TAsmList);virtual;
end;
tcprocinfo = class of tprocinfo;
var
cprocinfo : tcprocinfo;
{ information about the current sub routine being parsed (@var(pprocinfo))}
current_procinfo : tprocinfo;
implementation
uses
cutils,systems,
tgobj,cgobj,
paramgr
;
{****************************************************************************
TProcInfo
****************************************************************************}
constructor tprocinfo.create(aparent:tprocinfo);
begin
parent:=aparent;
procdef:=nil;
para_stack_size:=0;
flags:=[];
framepointer:=NR_FRAME_POINTER_REG;
maxpushedparasize:=0;
{ asmlists }
aktproccode:=TAsmList.Create;
aktlocaldata:=TAsmList.Create;
reference_reset(save_regs_ref,sizeof(aint));
{ labels }
current_asmdata.getjumplabel(CurrExitLabel);
current_asmdata.getjumplabel(CurrGOTLabel);
CurrBreakLabel:=nil;
CurrContinueLabel:=nil;
CurrTrueLabel:=nil;
CurrFalseLabel:=nil;
maxpushedparasize:=0;
end;
destructor tprocinfo.destroy;
begin
aktproccode.free;
aktlocaldata.free;
end;
procedure tprocinfo.allocate_push_parasize(size:longint);
begin
if size>maxpushedparasize then
maxpushedparasize:=size;
end;
function tprocinfo.calc_stackframe_size:longint;
begin
result:=Align(tg.direction*tg.lasttemp,current_settings.alignment.localalignmin);
end;
procedure tprocinfo.set_first_temp_offset;
begin
end;
procedure tprocinfo.generate_parameter_info;
begin
{ generate callee paraloc register info, it initialises the size that
is allocated on the stack }
procdef.init_paraloc_info(calleeside);
para_stack_size:=procdef.calleeargareasize;
end;
procedure tprocinfo.allocate_got_register(list: TAsmList);
begin
{ most os/cpu combo's don't use this yet, so not yet abstract }
end;
end.
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