mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-05-04 09:03:42 +02:00
4686f61002
so that they can still be freed after the reference has been changed
(e.g. in case of array indexing or record field accesses) (mantis #33628)
git-svn-id: trunk@38814 -
747 lines
24 KiB
ObjectPascal
747 lines
24 KiB
ObjectPascal
{
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Copyright (c) 1998-2008 by Carl Eric Codere and Peter Vreman
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Does the parsing for the ARM GNU AS styled inline assembler.
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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 raavrgas;
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{$i fpcdefs.inc}
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Interface
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uses
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raatt,raavr,
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cpubase;
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type
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tavrattreader = class(tattreader)
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function is_asmopcode(const s: string):boolean;override;
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function is_register(const s:string):boolean;override;
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procedure handleopcode;override;
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procedure BuildReference(oper : tavroperand);
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procedure BuildOperand(oper : tavroperand);
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procedure BuildOpCode(instr : tavrinstruction);
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procedure ReadSym(oper : tavroperand);
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procedure ConvertCalljmp(instr : tavrinstruction);
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end;
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Implementation
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uses
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{ helpers }
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cutils,
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{ global }
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globtype,globals,verbose,
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systems,
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{ aasm }
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cpuinfo,aasmbase,aasmtai,aasmdata,aasmcpu,
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{ symtable }
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symconst,symbase,symtype,symsym,symtable,symdef,
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{ parser }
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scanner,
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procinfo,
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itcpugas,
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rabase,rautils,
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cgbase,cgutils,cgobj,paramgr
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;
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function tavrattreader.is_register(const s:string):boolean;
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type
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treg2str = record
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name : string[2];
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reg : tregister;
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end;
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const
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extraregs : array[0..5] of treg2str = (
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(name: 'XL'; reg : NR_R26),
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(name: 'XH'; reg : NR_R27),
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(name: 'YL'; reg : NR_R28),
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(name: 'YH'; reg : NR_R29),
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(name: 'ZL'; reg : NR_R30),
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(name: 'ZH'; reg : NR_R31)
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);
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var
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i : longint;
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begin
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result:=inherited is_register(s);
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{ reg found?
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possible aliases are always 2 char
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}
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if result or (not (length(s) in [1,2])) then
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exit;
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for i:=low(extraregs) to high(extraregs) do
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begin
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if s=extraregs[i].name then
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begin
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actasmregister:=extraregs[i].reg;
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result:=true;
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actasmtoken:=AS_REGISTER;
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exit;
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end;
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end;
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end;
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procedure tavrattreader.ReadSym(oper : tavroperand);
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var
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tempstr, mangledname : string;
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typesize : tcgint;
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l,k : tcgint;
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begin
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tempstr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(tempstr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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if not oper.SetupVar(tempstr,false) then
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Message1(sym_e_unknown_id,tempstr);
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{ record.field ? }
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if actasmtoken=AS_DOT then
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begin
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BuildRecordOffsetSize(tempstr,l,k,mangledname,false);
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if (mangledname<>'') then
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Message(asmr_e_invalid_reference_syntax);
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inc(oper.opr.ref.offset,l);
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end;
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end;
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Procedure tavrattreader.BuildReference(oper : tavroperand);
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procedure Consume_RParen;
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begin
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if actasmtoken<>AS_RPAREN then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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end
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else
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begin
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Consume(AS_RPAREN);
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if not (actasmtoken in [AS_COMMA,AS_SEPARATOR,AS_END]) then
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(true);
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end;
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end;
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end;
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procedure read_index;
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begin
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Consume(AS_COMMA);
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if actasmtoken=AS_REGISTER then
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Begin
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oper.opr.ref.index:=actasmregister;
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Consume(AS_REGISTER);
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end
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else if actasmtoken=AS_HASH then
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begin
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Consume(AS_HASH);
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inc(oper.opr.ref.offset,BuildConstExpression(false,true));
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end;
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end;
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begin
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Consume(AS_LPAREN);
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if actasmtoken=AS_REGISTER then
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begin
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oper.opr.ref.base:=actasmregister;
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Consume(AS_REGISTER);
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{ can either be a register or a right parenthesis }
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{ (reg) }
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if actasmtoken=AS_LPAREN then
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Begin
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Consume_RParen;
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exit;
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end;
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if actasmtoken=AS_PLUS then
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begin
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consume(AS_PLUS);
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oper.opr.ref.addressmode:=AM_POSTINCREMENT;
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end;
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end {end case }
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end;
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Procedure tavrattreader.BuildOperand(oper : tavroperand);
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var
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expr : string;
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typesize,l : tcgint;
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procedure AddLabelOperand(hl:tasmlabel);
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begin
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if not(actasmtoken in [AS_PLUS,AS_MINUS,AS_LPAREN]) { and
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is_calljmp(actopcode) } then
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begin
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=hl;
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end
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else
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begin
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oper.InitRef;
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oper.opr.ref.symbol:=hl;
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end;
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end;
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procedure MaybeRecordOffset;
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var
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mangledname: string;
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hasdot : boolean;
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l,
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toffset,
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tsize : tcgint;
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begin
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if not(actasmtoken in [AS_DOT,AS_PLUS,AS_MINUS]) then
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exit;
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l:=0;
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mangledname:='';
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hasdot:=(actasmtoken=AS_DOT);
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if hasdot then
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begin
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if expr<>'' then
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begin
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BuildRecordOffsetSize(expr,toffset,tsize,mangledname,false);
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if (oper.opr.typ<>OPR_CONSTANT) and
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(mangledname<>'') then
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Message(asmr_e_wrong_sym_type);
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inc(l,toffset);
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oper.SetSize(tsize,true);
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end;
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end;
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if actasmtoken in [AS_PLUS,AS_MINUS] then
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inc(l,BuildConstExpression(true,false));
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case oper.opr.typ of
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OPR_LOCAL :
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begin
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{ don't allow direct access to fields of parameters, because that
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will generate buggy code. Allow it only for explicit typecasting }
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if hasdot and
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(not oper.hastype) then
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checklocalsubscript(oper.opr.localsym);
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inc(oper.opr.localsymofs,l)
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end;
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_REFERENCE :
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if (mangledname<>'') then
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begin
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if (oper.opr.val<>0) then
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Message(asmr_e_wrong_sym_type);
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oper.opr.typ:=OPR_SYMBOL;
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oper.opr.symbol:=current_asmdata.RefAsmSymbol(mangledname,AT_FUNCTION);
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end
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else
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inc(oper.opr.val,l);
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OPR_SYMBOL:
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Message(asmr_e_invalid_symbol_ref);
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else
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internalerror(200309221);
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end;
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end;
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function MaybeBuildReference:boolean;
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{ Try to create a reference, if not a reference is found then false
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is returned }
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begin
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MaybeBuildReference:=true;
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case actasmtoken of
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS:
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Begin
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oper.opr.ref.offset:=BuildConstExpression(True,False);
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case actasmtoken of
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AS_LPAREN:
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BuildReference(oper);
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AS_COMMA:
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exit;
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else
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Message(asmr_e_invalid_reference_syntax)
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end;
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end;
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AS_LPAREN:
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BuildReference(oper);
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AS_ID: { only a variable is allowed ... }
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Begin
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ReadSym(oper);
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case actasmtoken of
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AS_END,
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AS_SEPARATOR,
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AS_COMMA: ;
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AS_LPAREN:
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BuildReference(oper);
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else
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Begin
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Message(asmr_e_invalid_reference_syntax);
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Consume(actasmtoken);
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end;
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end; {end case }
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end;
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else
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MaybeBuildReference:=false;
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end; { end case }
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end;
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var
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tempreg : tregister;
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ireg : tsuperregister;
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hl : tasmlabel;
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ofs : longint;
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registerset : tcpuregisterset;
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tempstr : string;
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tempsymtyp : tasmsymtype;
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Begin
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expr:='';
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case actasmtoken of
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AS_LBRACKET: { Memory reference or constant expression }
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Begin
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oper.InitRef;
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BuildReference(oper);
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end;
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AS_INTNUM,
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AS_MINUS,
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AS_PLUS,
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AS_NOT:
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Begin
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if (actasmtoken=AS_MINUS) and
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(actopcode in [A_LD,A_ST]) then
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begin
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{ Special handling of predecrement addressing }
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oper.InitRef;
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oper.opr.ref.addressmode:=AM_PREDRECEMENT;
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consume(AS_MINUS);
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if actasmtoken=AS_REGISTER then
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begin
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oper.opr.ref.base:=actasmregister;
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consume(AS_REGISTER);
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end
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else
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begin
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Message(asmr_e_invalid_reference_syntax);
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RecoverConsume(false);
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end;
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end
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else
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begin
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{ Constant memory offset }
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{ This must absolutely be followed by ( }
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oper.InitRef;
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oper.opr.ref.offset:=BuildConstExpression(True,False);
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{ absolute memory addresss? }
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if ((actopcode = A_LDS) and (actasmtoken <> AS_SEPARATOR)) or
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((actopcode = A_STS) and (actasmtoken <> AS_COMMA)) then
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begin
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if not(MaybeBuildReference) then
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Message(asmr_e_invalid_reference_syntax);
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end
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else
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begin
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ofs:=oper.opr.ref.offset;
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BuildConstantOperand(oper);
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inc(oper.opr.val,ofs);
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end;
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end;
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end;
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AS_ID: { A constant expression, or a Variable ref. }
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Begin
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if (actasmpattern='LO8') or (actasmpattern='HI8') then
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begin
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{ Low or High part of a constant (or constant
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memory location) }
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oper.InitRef;
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if actasmpattern='LO8' then
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oper.opr.ref.refaddr:=addr_lo8
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else
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oper.opr.ref.refaddr:=addr_hi8;
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Consume(actasmtoken);
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Consume(AS_LPAREN);
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BuildConstSymbolExpression(false, true,false,l,tempstr,tempsymtyp);
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if not assigned(oper.opr.ref.symbol) then
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oper.opr.ref.symbol:=current_asmdata.RefAsmSymbol(tempstr,tempsymtyp)
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else
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Message(asmr_e_cant_have_multiple_relocatable_symbols);
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case oper.opr.typ of
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_LOCAL :
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inc(oper.opr.localsymofs,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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internalerror(200309202);
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end;
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Consume(AS_RPAREN);
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end
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{ Local Label ? }
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else if is_locallabel(actasmpattern) then
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begin
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CreateLocalLabel(actasmpattern,hl,false);
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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{ Check for label }
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else if SearchLabel(actasmpattern,hl,false) then
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begin
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Consume(AS_ID);
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AddLabelOperand(hl);
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end
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else
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{ probably a variable or normal expression }
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{ or a procedure (such as in CALL ID) }
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Begin
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{ is it a constant ? }
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if SearchIConstant(actasmpattern,l) then
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Begin
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if not (oper.opr.typ in [OPR_NONE,OPR_CONSTANT]) then
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Message(asmr_e_invalid_operand_type);
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BuildConstantOperand(oper);
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end
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else
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begin
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expr:=actasmpattern;
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Consume(AS_ID);
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{ typecasting? }
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if (actasmtoken=AS_LPAREN) and
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SearchType(expr,typesize) then
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begin
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oper.hastype:=true;
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Consume(AS_LPAREN);
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BuildOperand(oper);
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Consume(AS_RPAREN);
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if oper.opr.typ in [OPR_REFERENCE,OPR_LOCAL] then
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oper.SetSize(typesize,true);
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end
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else
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begin
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if not(oper.SetupVar(expr,false)) then
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Begin
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{ look for special symbols ... }
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if expr= '__HIGH' then
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begin
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consume(AS_LPAREN);
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if not oper.setupvar('high'+actasmpattern,false) then
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Message1(sym_e_unknown_id,'high'+actasmpattern);
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consume(AS_ID);
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consume(AS_RPAREN);
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end
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else
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if expr = '__RESULT' then
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oper.SetUpResult
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else
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if expr = '__SELF' then
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oper.SetupSelf
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else
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if expr = '__OLDEBP' then
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oper.SetupOldEBP
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else
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Message1(sym_e_unknown_id,expr);
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end;
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end;
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end;
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if actasmtoken=AS_DOT then
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MaybeRecordOffset;
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{ add a constant expression? }
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if (actasmtoken=AS_PLUS) then
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begin
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l:=BuildConstExpression(true,false);
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case oper.opr.typ of
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OPR_CONSTANT :
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inc(oper.opr.val,l);
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OPR_LOCAL :
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inc(oper.opr.localsymofs,l);
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OPR_REFERENCE :
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inc(oper.opr.ref.offset,l);
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else
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internalerror(200309202);
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end;
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end
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end;
|
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{ Do we have a indexing reference, then parse it also }
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if actasmtoken=AS_LPAREN then
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BuildReference(oper);
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end;
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|
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{ Register, a variable reference or a constant reference }
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AS_REGISTER:
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Begin
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{ save the type of register used. }
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tempreg:=actasmregister;
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Consume(AS_REGISTER);
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if (actasmtoken=AS_PLUS) then
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begin
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oper.opr.typ:=OPR_REFERENCE;
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|
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reference_reset_base(oper.opr.ref,tempreg,0,ctempposinvalid,1,[]);
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|
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{ add a constant expression? }
|
|
if actasmtoken=AS_PLUS then
|
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begin
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consume(AS_PLUS);
|
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if actasmtoken in [AS_INTNUM,AS_ID] then
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begin
|
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l:=BuildConstExpression(true,false);
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inc(oper.opr.ref.offset,l);
|
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end
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else
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oper.opr.ref.addressmode:=AM_POSTINCREMENT;
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end;
|
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end
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else if (actasmtoken in [AS_END,AS_SEPARATOR,AS_COMMA]) then
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Begin
|
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if not (oper.opr.typ in [OPR_NONE,OPR_REGISTER]) then
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Message(asmr_e_invalid_operand_type);
|
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oper.opr.typ:=OPR_REGISTER;
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oper.opr.reg:=tempreg;
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end
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else
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Message(asmr_e_syn_operand);
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end;
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AS_END,
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AS_SEPARATOR,
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AS_COMMA: ;
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else
|
|
Begin
|
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Message(asmr_e_syn_operand);
|
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Consume(actasmtoken);
|
|
end;
|
|
end; { end case }
|
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end;
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|
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{*****************************************************************************
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tavrattreader
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*****************************************************************************}
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procedure tavrattreader.BuildOpCode(instr : tavrinstruction);
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var
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operandnum : longint;
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Begin
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{ opcode }
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if (actasmtoken<>AS_OPCODE) then
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Begin
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Message(asmr_e_invalid_or_missing_opcode);
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RecoverConsume(true);
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exit;
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end;
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{ Fill the instr object with the current state }
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with instr do
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begin
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Opcode:=ActOpcode;
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condition:=ActCondition;
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end;
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{ We are reading operands, so opcode will be an AS_ID }
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operandnum:=1;
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Consume(AS_OPCODE);
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{ Zero operand opcode ? }
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if actasmtoken in [AS_SEPARATOR,AS_END] then
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begin
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operandnum:=0;
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exit;
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end;
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{ Read the operands }
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repeat
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case actasmtoken of
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AS_COMMA: { Operand delimiter }
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Begin
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if operandnum>Max_Operands then
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Message(asmr_e_too_many_operands)
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else
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Inc(operandnum);
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Consume(AS_COMMA);
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end;
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AS_SEPARATOR,
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AS_END : { End of asm operands for this opcode }
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begin
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break;
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end;
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else
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BuildOperand(instr.Operands[operandnum] as tavroperand);
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end; { end case }
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until false;
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instr.Ops:=operandnum;
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end;
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function tavrattreader.is_asmopcode(const s: string):boolean;
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const
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{ sorted by length so longer postfixes will match first }
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postfix2strsorted : array[1..19] of string[2] = (
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'EP','SB','BT','SH',
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'IA','IB','DA','DB','FD','FA','ED','EA',
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'B','D','E','P','T','H','S');
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var
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len,
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j,
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sufidx : longint;
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hs : string;
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maxlen : longint;
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icond : tasmcond;
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Begin
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{ making s a value parameter would break other assembler readers }
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hs:=s;
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is_asmopcode:=false;
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{ clear op code }
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actopcode:=A_None;
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actcondition:=C_None;
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{ first, handle B else BLS is read wrong }
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if ((copy(hs,1,2)='BR') and (length(hs)=4)) then
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begin
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for icond:=low(tasmcond) to high(tasmcond) do
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begin
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if copy(hs,2,3)=uppercond2str[icond] then
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begin
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actopcode:=A_BRxx;
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actasmtoken:=AS_OPCODE;
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actcondition:=icond;
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is_asmopcode:=true;
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exit;
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end;
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end;
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end;
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maxlen:=max(length(hs),5);
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actopcode:=A_NONE;
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for j:=maxlen downto 1 do
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begin
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actopcode:=tasmop(PtrUInt(iasmops.Find(copy(hs,1,j))));
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if actopcode<>A_NONE then
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begin
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actasmtoken:=AS_OPCODE;
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{ strip op code }
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delete(hs,1,j);
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break;
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end;
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end;
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if actopcode=A_NONE then
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exit;
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{ search for condition, conditions are always 2 chars }
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if length(hs)>1 then
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begin
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for icond:=low(tasmcond) to high(tasmcond) do
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begin
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if copy(hs,1,2)=uppercond2str[icond] then
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begin
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actcondition:=icond;
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{ strip condition }
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delete(hs,1,2);
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break;
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end;
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end;
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end;
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{ if we stripped all postfixes, it's a valid opcode }
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is_asmopcode:=length(hs)=0;
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end;
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procedure tavrattreader.ConvertCalljmp(instr : tavrinstruction);
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var
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newopr : toprrec;
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begin
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if instr.Operands[1].opr.typ=OPR_REFERENCE then
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begin
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newopr.typ:=OPR_SYMBOL;
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newopr.symbol:=instr.Operands[1].opr.ref.symbol;
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newopr.symofs:=instr.Operands[1].opr.ref.offset;
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if (instr.Operands[1].opr.ref.base<>NR_NO) or
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(instr.Operands[1].opr.ref.index<>NR_NO) then
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Message(asmr_e_syn_operand);
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instr.Operands[1].opr:=newopr;
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end;
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end;
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procedure tavrattreader.handleopcode;
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var
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instr : tavrinstruction;
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begin
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instr:=tavrinstruction.Create(tavroperand);
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BuildOpcode(instr);
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{ if is_calljmp(instr.opcode) then
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ConvertCalljmp(instr); }
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{
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instr.AddReferenceSizes;
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instr.SetInstructionOpsize;
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instr.CheckOperandSizes;
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}
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instr.ConcatInstruction(curlist);
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instr.Free;
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end;
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{*****************************************************************************
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Initialize
|
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*****************************************************************************}
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const
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asmmode_avr_att_info : tasmmodeinfo =
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(
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id : asmmode_avr_gas;
|
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idtxt : 'GAS';
|
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casmreader : tavrattreader;
|
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);
|
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asmmode_avr_standard_info : tasmmodeinfo =
|
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(
|
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id : asmmode_standard;
|
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idtxt : 'STANDARD';
|
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casmreader : tavrattreader;
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);
|
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|
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initialization
|
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RegisterAsmMode(asmmode_avr_att_info);
|
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RegisterAsmMode(asmmode_avr_standard_info);
|
|
end.
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