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02adc2b6ab
a structure whose address is passed by the caller (the caller is
responsible there to remove the address from the stack, unlike on
e.g. linux/i386 and darwin/i386) (mantis #9013)
git-svn-id: trunk@7667 -
121 lines
4.2 KiB
ObjectPascal
121 lines
4.2 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate i386 assembler for in call nodes
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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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unit n386cal;
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{$i fpcdefs.inc}
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interface
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{ $define AnsiStrRef}
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uses
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ncgcal;
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type
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ti386callnode = class(tcgcallnode)
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protected
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procedure pop_parasize(pop_size:longint);override;
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procedure extra_interrupt_code;override;
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end;
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implementation
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uses
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globtype,systems,
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cutils,verbose,globals,
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cgbase,cgutils,
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cpubase,paramgr,
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aasmtai,aasmdata,aasmcpu,
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ncal,nbas,nmem,nld,ncnv,
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cga,cgobj,cpuinfo;
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{*****************************************************************************
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TI386CALLNODE
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*****************************************************************************}
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procedure ti386callnode.extra_interrupt_code;
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begin
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if (target_info.system <> system_i386_darwin) then
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begin
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emit_none(A_PUSHF,S_L);
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emit_reg(A_PUSH,S_L,NR_CS);
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end;
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end;
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procedure ti386callnode.pop_parasize(pop_size:longint);
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var
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hreg : tregister;
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begin
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if (use_fixed_stack) then
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begin
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{ very weird: in this case the callee does a "ret $4" and the }
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{ caller immediately a "subl $4,%esp". Possibly this is for }
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{ use_fixed_stack code to be able to transparently call }
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{ old-style code (JM) }
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dec(pop_size,pushedparasize);
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if (pop_size < 0) then
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current_asmdata.CurrAsmList.concat(taicpu.op_const_reg(A_SUB,S_L,-pop_size,NR_ESP));
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exit;
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end;
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{ on win32, the caller is responsible for removing the funcret }
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{ pointer from the stack, unlike on Linux. Don't know about }
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{ elsewhere (except Darwin, handled above), but since the default }
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{ was "callee removes funcret pointer from stack" until now, we'll }
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{ keep that default for everyone else (ncgcal decreases popsize by }
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{ sizeof(aint) in case of ret_in_param()) }
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if (target_info.system = system_i386_win32) and
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paramanager.ret_in_param(procdefinition.returndef,procdefinition.proccalloption) then
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inc(pop_size,sizeof(aint));
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{ better than an add on all processors }
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if pop_size=4 then
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begin
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hreg:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_POP,S_L,hreg));
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end
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{ the pentium has two pipes and pop reg is pairable }
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{ but the registers must be different! }
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else
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if (pop_size=8) and
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not(cs_opt_size in current_settings.optimizerswitches) and
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(current_settings.optimizecputype=cpu_Pentium) then
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begin
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hreg:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_POP,S_L,hreg));
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hreg:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_POP,S_L,hreg));
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end
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else
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if pop_size<>0 then
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current_asmdata.CurrAsmList.concat(taicpu.op_const_reg(A_ADD,S_L,pop_size,NR_ESP));
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end;
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begin
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ccallnode:=ti386callnode;
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end.
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