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a25ebbba3e
o separate information for reading and writing, because e.g. in a
try-block, only the writes to local variables and parameters are
volatile (they have to be committed immediately in case the next
instruction causes an exception)
o for now, only references to absolute memory addresses are marked
as volatile
o the volatily information is (should be) properly maintained throughout
all code generators for all archictures with this patch
o no optimizers or other compiler infrastructure uses the volatility
information yet
o this functionality is not (yet) exposed at the language level, it
is only for internal code generator use right now
git-svn-id: trunk@34996 -
93 lines
2.8 KiB
ObjectPascal
93 lines
2.8 KiB
ObjectPascal
{
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Copyright (c) 1998-2010 by Florian Klaempfl and Jonas Maebe
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Member of the Free Pascal development team
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This unit contains routines to create a pass-through high-level code
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generator. This is used by most regular code generators.
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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 hlcgx86;
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interface
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{$i fpcdefs.inc}
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uses
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globtype,
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aasmdata,
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symtype,symdef,
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parabase,
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hlcgobj, hlcg2ll;
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type
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{ thlcgx86 }
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thlcgx86 = class(thlcg2ll)
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protected
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procedure gen_load_uninitialized_function_result(list: TAsmList; pd: tprocdef; resdef: tdef; const resloc: tcgpara); override;
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procedure a_jmp_external_name(list: TAsmList; const externalname: TSymStr); override;
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end;
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implementation
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uses
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globals,systems,
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aasmbase,
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cgbase,cgutils,
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cpubase,aasmcpu;
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{ thlcgx86 }
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procedure thlcgx86.gen_load_uninitialized_function_result(list: TAsmList; pd: tprocdef; resdef: tdef; const resloc: tcgpara);
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begin
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{ the caller will pop a value from the fpu stack }
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if assigned(resloc.location) and
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(resloc.location^.loc=LOC_FPUREGISTER) then
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list.concat(taicpu.op_none(A_FLDZ));
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end;
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procedure thlcgx86.a_jmp_external_name(list: TAsmList; const externalname: TSymStr);
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var
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ref : treference;
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sym : tasmsymbol;
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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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{ a_jmp_name jumps to a stub which is always pic-safe on darwin }
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inherited;
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exit;
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end;
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sym:=current_asmdata.RefAsmSymbol(externalname,AT_FUNCTION);
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reference_reset_symbol(ref,sym,0,sizeof(pint),[]);
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{ create pic'ed? }
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if (cs_create_pic in current_settings.moduleswitches) and
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{ darwin/x86_64's assembler doesn't want @PLT after call symbols }
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not(target_info.system in [system_x86_64_darwin,system_i386_iphonesim,system_x86_64_iphonesim]) then
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ref.refaddr:=addr_pic
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else
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ref.refaddr:=addr_full;
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list.concat(taicpu.op_ref(A_JMP,S_NO,ref));
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end;
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end.
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