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https://gitlab.com/freepascal.org/fpc/source.git
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1183 lines
42 KiB
ObjectPascal
1183 lines
42 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Does the parsing of the statements
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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 pstatmnt;
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{$i fpcdefs.inc}
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interface
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uses
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tokens,node;
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function statement_block(starttoken : ttoken) : tnode;
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{ reads an assembler block }
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function assembler_block : tnode;
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implementation
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uses
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{ common }
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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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cpubase,aasmbase,aasmtai,
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{ symtable }
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symconst,symbase,symtype,symdef,symsym,symtable,defutil,defcmp,
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paramgr,symutil,
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{ pass 1 }
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pass_1,htypechk,
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nutils,nbas,nmat,nadd,ncal,nmem,nset,ncnv,ninl,ncon,nld,nflw,
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{ parser }
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scanner,
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pbase,pexpr,
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{ codegen }
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procinfo,cgbase,
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{ assembler reader }
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rabase
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;
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function statement : tnode;forward;
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function if_statement : tnode;
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var
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ex,if_a,else_a : tnode;
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begin
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consume(_IF);
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ex:=comp_expr(true);
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consume(_THEN);
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if token<>_ELSE then
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if_a:=statement
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else
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if_a:=nil;
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if try_to_consume(_ELSE) then
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else_a:=statement
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else
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else_a:=nil;
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result:=cifnode.create(ex,if_a,else_a);
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end;
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{ creates a block (list) of statements, til the next END token }
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function statements_til_end : tnode;
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var
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first,last : tstatementnode;
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begin
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first:=nil;
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while token<>_END do
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begin
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if first=nil then
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begin
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last:=cstatementnode.create(statement,nil);
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first:=last;
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end
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else
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begin
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last.right:=cstatementnode.create(statement,nil);
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last:=tstatementnode(last.right);
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end;
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if not try_to_consume(_SEMICOLON) then
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break;
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consume_emptystats;
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end;
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consume(_END);
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statements_til_end:=cblocknode.create(first);
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end;
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function case_statement : tnode;
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var
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casedef : tdef;
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caseexpr,p : tnode;
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blockid : longint;
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hl1,hl2 : TConstExprInt;
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casedeferror : boolean;
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casenode : tcasenode;
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begin
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consume(_CASE);
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caseexpr:=comp_expr(true);
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{ determines result type }
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do_resulttypepass(caseexpr);
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set_varstate(caseexpr,vs_used,[vsf_must_be_valid]);
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casedeferror:=false;
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casedef:=caseexpr.resulttype.def;
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if (not assigned(casedef)) or
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not(is_ordinal(casedef)) then
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begin
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CGMessage(type_e_ordinal_expr_expected);
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{ create a correct tree }
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caseexpr.free;
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caseexpr:=cordconstnode.create(0,u32inttype,false);
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{ set error flag so no rangechecks are done }
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casedeferror:=true;
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end;
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{ Create casenode }
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casenode:=ccasenode.create(caseexpr);
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consume(_OF);
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{ Parse all case blocks }
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blockid:=0;
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repeat
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{ maybe an instruction has more case labels }
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repeat
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p:=expr;
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if is_widechar(casedef) then
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begin
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if (p.nodetype=rangen) then
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begin
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trangenode(p).left:=ctypeconvnode.create(trangenode(p).left,cwidechartype);
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trangenode(p).right:=ctypeconvnode.create(trangenode(p).right,cwidechartype);
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do_resulttypepass(trangenode(p).left);
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do_resulttypepass(trangenode(p).right);
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end
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else
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begin
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p:=ctypeconvnode.create(p,cwidechartype);
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do_resulttypepass(p);
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end;
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end;
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hl1:=0;
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hl2:=0;
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if (p.nodetype=rangen) then
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begin
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{ type checking for case statements }
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if is_subequal(casedef, trangenode(p).left.resulttype.def) and
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is_subequal(casedef, trangenode(p).right.resulttype.def) then
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begin
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hl1:=get_ordinal_value(trangenode(p).left);
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hl2:=get_ordinal_value(trangenode(p).right);
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if hl1>hl2 then
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CGMessage(parser_e_case_lower_less_than_upper_bound);
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if not casedeferror then
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begin
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testrange(casedef,hl1,false);
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testrange(casedef,hl2,false);
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end;
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end
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else
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CGMessage(parser_e_case_mismatch);
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casenode.addlabel(blockid,hl1,hl2);
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end
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else
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begin
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{ type checking for case statements }
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if not is_subequal(casedef, p.resulttype.def) then
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CGMessage(parser_e_case_mismatch);
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hl1:=get_ordinal_value(p);
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if not casedeferror then
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testrange(casedef,hl1,false);
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casenode.addlabel(blockid,hl1,hl1);
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end;
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p.free;
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if token=_COMMA then
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consume(_COMMA)
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else
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break;
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until false;
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consume(_COLON);
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{ add instruction block }
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casenode.addblock(blockid,statement);
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{ next block }
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inc(blockid);
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if not(token in [_ELSE,_OTHERWISE,_END]) then
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consume(_SEMICOLON);
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until (token in [_ELSE,_OTHERWISE,_END]);
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if (token in [_ELSE,_OTHERWISE]) then
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begin
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if not try_to_consume(_ELSE) then
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consume(_OTHERWISE);
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casenode.addelseblock(statements_til_end);
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end
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else
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consume(_END);
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result:=casenode;
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end;
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function repeat_statement : tnode;
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var
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first,last,p_e : tnode;
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begin
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consume(_REPEAT);
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first:=nil;
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while token<>_UNTIL do
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begin
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if first=nil then
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begin
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last:=cstatementnode.create(statement,nil);
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first:=last;
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end
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else
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begin
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tstatementnode(last).right:=cstatementnode.create(statement,nil);
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last:=tstatementnode(last).right;
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end;
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if not try_to_consume(_SEMICOLON) then
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break;
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consume_emptystats;
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end;
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consume(_UNTIL);
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first:=cblocknode.create(first);
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p_e:=comp_expr(true);
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result:=cwhilerepeatnode.create(p_e,first,false,true);
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end;
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function while_statement : tnode;
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var
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p_e,p_a : tnode;
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begin
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consume(_WHILE);
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p_e:=comp_expr(true);
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consume(_DO);
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p_a:=statement;
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result:=cwhilerepeatnode.create(p_e,p_a,true,false);
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end;
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function for_statement : tnode;
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procedure check_range(hp:tnode);
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begin
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{$ifndef cpu64bit}
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if hp.nodetype=ordconstn then
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begin
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if (tordconstnode(hp).value<low(longint)) or
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(tordconstnode(hp).value>high(longint)) then
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begin
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CGMessage(parser_e_range_check_error);
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{ recover, prevent more warnings/errors }
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tordconstnode(hp).value:=0;
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end;
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end;
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{$endif cpu64bit}
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end;
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var
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hp,
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hloopvar,
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hblock,
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hto,hfrom : tnode;
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backward : boolean;
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loopvarsym : tabstractvarsym;
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begin
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{ parse loop header }
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consume(_FOR);
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hloopvar:=factor(false);
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{ Check loop variable }
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loopvarsym:=nil;
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{ variable must be an ordinal, int64 is not allowed for 32bit targets }
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if not(is_ordinal(hloopvar.resulttype.def))
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{$ifndef cpu64bit}
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or is_64bitint(hloopvar.resulttype.def)
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{$endif cpu64bit}
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then
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MessagePos(hloopvar.fileinfo,type_e_ordinal_expr_expected);
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hp:=hloopvar;
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while assigned(hp) and
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(
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{ record/object fields are allowed in tp7 mode only }
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(
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(m_tp7 in aktmodeswitches) and
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(hp.nodetype=subscriptn) and
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((tsubscriptnode(hp).left.resulttype.def.deftype=recorddef) or
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is_object(tsubscriptnode(hp).left.resulttype.def))
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) or
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{ constant array index }
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(
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(hp.nodetype=vecn) and
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is_constintnode(tvecnode(hp).right)
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) or
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{ equal typeconversions }
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(
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(hp.nodetype=typeconvn) and
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(ttypeconvnode(hp).convtype=tc_equal)
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)
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) do
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begin
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{ Use the recordfield for loopvarsym }
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if not assigned(loopvarsym) and
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(hp.nodetype=subscriptn) then
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loopvarsym:=tsubscriptnode(hp).vs;
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hp:=tunarynode(hp).left;
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end;
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if assigned(hp) and
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(hp.nodetype=loadn) then
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begin
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case tloadnode(hp).symtableentry.typ of
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globalvarsym,
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localvarsym,
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paravarsym :
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begin
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{ we need a simple loadn and the load must be in a global symtable or
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in the same level as the para of the current proc }
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if (
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(tloadnode(hp).symtable.symtablelevel=main_program_level) or
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(tloadnode(hp).symtable.symtablelevel=current_procinfo.procdef.parast.symtablelevel)
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) and
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not(
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((tabstractvarsym(tloadnode(hp).symtableentry).varspez in [vs_var,vs_out]) or
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(vo_is_thread_var in tabstractvarsym(tloadnode(hp).symtableentry).varoptions))
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) then
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begin
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{ Assigning for-loop variable is only allowed in tp7 }
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if not(m_tp7 in aktmodeswitches) then
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begin
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if not assigned(loopvarsym) then
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loopvarsym:=tabstractvarsym(tloadnode(hp).symtableentry);
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include(loopvarsym.varoptions,vo_is_loop_counter);
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end;
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end
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else
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MessagePos(hp.fileinfo,type_e_illegal_count_var);
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end;
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typedconstsym :
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begin
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{ Bad programming, only allowed in tp7 mode }
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if not(m_tp7 in aktmodeswitches) then
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MessagePos(hp.fileinfo,type_e_illegal_count_var);
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end;
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else
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MessagePos(hp.fileinfo,type_e_illegal_count_var);
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end;
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end
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else
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MessagePos(hloopvar.fileinfo,type_e_illegal_count_var);
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consume(_ASSIGNMENT);
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hfrom:=comp_expr(true);
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if try_to_consume(_DOWNTO) then
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backward:=true
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else
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begin
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consume(_TO);
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backward:=false;
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end;
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hto:=comp_expr(true);
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consume(_DO);
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{ Check if the constants fit in the range }
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check_range(hfrom);
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check_range(hto);
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{ first set the varstate for from and to, so
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uses of loopvar in those expressions will also
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trigger a warning when it is not used yet. This
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needs to be done before the instruction block is
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parsed to have a valid hloopvar }
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resulttypepass(hfrom);
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set_varstate(hfrom,vs_used,[vsf_must_be_valid]);
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resulttypepass(hto);
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set_varstate(hto,vs_used,[vsf_must_be_valid]);
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resulttypepass(hloopvar);
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set_varstate(hloopvar,vs_used,[]);
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{ ... now the instruction block }
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hblock:=statement;
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{ variable is not used for loop counter anymore }
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if assigned(loopvarsym) then
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exclude(loopvarsym.varoptions,vo_is_loop_counter);
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result:=cfornode.create(hloopvar,hfrom,hto,hblock,backward);
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end;
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function _with_statement : tnode;
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var
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right,p : tnode;
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i,levelcount : longint;
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withsymtable,symtab : tsymtable;
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obj : tobjectdef;
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hp : tnode;
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newblock : tblocknode;
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newstatement : tstatementnode;
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calltempp,
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loadp : ttempcreatenode;
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refp : tnode;
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htype : ttype;
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hasimplicitderef : boolean;
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begin
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p:=comp_expr(true);
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do_resulttypepass(p);
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right:=nil;
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if (not codegenerror) and
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(p.resulttype.def.deftype in [objectdef,recorddef]) then
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begin
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newblock:=nil;
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{ ignore nodes that don't add instructions in the tree }
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hp:=p;
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while { equal type conversions }
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(
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(hp.nodetype=typeconvn) and
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(ttypeconvnode(hp).convtype=tc_equal)
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) or
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{ constant array index }
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(
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(hp.nodetype=vecn) and
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(tvecnode(hp).right.nodetype=ordconstn)
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) do
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hp:=tunarynode(hp).left;
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if (hp.nodetype=loadn) and
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(
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(tloadnode(hp).symtable=current_procinfo.procdef.localst) or
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(tloadnode(hp).symtable=current_procinfo.procdef.parast) or
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(tloadnode(hp).symtable.symtabletype in [staticsymtable,globalsymtable])
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) then
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begin
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{ simple load, we can reference direct }
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loadp:=nil;
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refp:=p;
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end
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else
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begin
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calltempp:=nil;
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{ complex load, load in temp first }
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newblock:=internalstatements(newstatement);
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{ when right is a call then load it first in a temp }
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if p.nodetype=calln then
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begin
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calltempp:=ctempcreatenode.create(p.resulttype,p.resulttype.def.size,tt_persistent,false);
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addstatement(newstatement,calltempp);
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addstatement(newstatement,cassignmentnode.create(
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ctemprefnode.create(calltempp),
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p));
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p:=ctemprefnode.create(calltempp);
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resulttypepass(p);
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end;
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{ classes and interfaces have implicit dereferencing }
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hasimplicitderef:=is_class_or_interface(p.resulttype.def);
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if hasimplicitderef then
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htype:=p.resulttype
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else
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htype.setdef(tpointerdef.create(p.resulttype));
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{$ifdef WITHNODEDEBUG}
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{ we can't generate debuginfo for a withnode stored in a }
|
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{ register }
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if (cs_debuginfo in aktmoduleswitches) then
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loadp:=ctempcreatenode.create(htype,sizeof(aint),tt_persistent,false)
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else
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{$endif WITHNODEDEBUG}
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loadp:=ctempcreatenode.create(htype,sizeof(aint),tt_persistent,true);
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resulttypepass(loadp);
|
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if hasimplicitderef then
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begin
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hp:=p;
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refp:=ctemprefnode.create(loadp);
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end
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else
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begin
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hp:=caddrnode.create_internal(p);
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refp:=cderefnode.create(ctemprefnode.create(loadp));
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end;
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addstatement(newstatement,loadp);
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addstatement(newstatement,cassignmentnode.create(
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ctemprefnode.create(loadp),
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hp));
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resulttypepass(refp);
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end;
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case p.resulttype.def.deftype of
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objectdef :
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begin
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obj:=tobjectdef(p.resulttype.def);
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withsymtable:=twithsymtable.Create(obj,obj.symtable.symsearch,refp);
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{ include also all parent symtables }
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levelcount:=1;
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obj:=obj.childof;
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symtab:=withsymtable;
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while assigned(obj) do
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begin
|
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{ keep the original tobjectdef as owner, because that is used for
|
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visibility of the symtable }
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symtab.next:=twithsymtable.create(tobjectdef(p.resulttype.def),obj.symtable.symsearch,refp.getcopy);
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symtab:=symtab.next;
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obj:=obj.childof;
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inc(levelcount);
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end;
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symtab.next:=symtablestack;
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symtablestack:=withsymtable;
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end;
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recorddef :
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begin
|
|
symtab:=trecorddef(p.resulttype.def).symtable;
|
|
levelcount:=1;
|
|
withsymtable:=twithsymtable.create(trecorddef(p.resulttype.def),symtab.symsearch,refp);
|
|
withsymtable.next:=symtablestack;
|
|
symtablestack:=withsymtable;
|
|
end;
|
|
end;
|
|
if try_to_consume(_COMMA) then
|
|
right:=_with_statement()
|
|
else
|
|
begin
|
|
consume(_DO);
|
|
if token<>_SEMICOLON then
|
|
right:=statement
|
|
else
|
|
right:=cerrornode.create;
|
|
end;
|
|
{ remove symtables from the stack }
|
|
for i:=1 to levelcount do
|
|
symtablestack:=symtablestack.next;
|
|
p:=cwithnode.create(right,twithsymtable(withsymtable),levelcount,refp);
|
|
{ Finalize complex withnode with destroy of temp }
|
|
if assigned(newblock) then
|
|
begin
|
|
addstatement(newstatement,p);
|
|
addstatement(newstatement,ctempdeletenode.create(loadp));
|
|
if assigned(calltempp) then
|
|
addstatement(newstatement,ctempdeletenode.create(calltempp));
|
|
p:=newblock;
|
|
end;
|
|
_with_statement:=p;
|
|
end
|
|
else
|
|
begin
|
|
p.free;
|
|
Message(parser_e_false_with_expr);
|
|
{ try to recover from error }
|
|
if try_to_consume(_COMMA) then
|
|
begin
|
|
hp:=_with_statement();
|
|
if (hp=nil) then; { remove warning about unused }
|
|
end
|
|
else
|
|
begin
|
|
consume(_DO);
|
|
{ ignore all }
|
|
if token<>_SEMICOLON then
|
|
statement;
|
|
end;
|
|
_with_statement:=nil;
|
|
end;
|
|
end;
|
|
|
|
|
|
function with_statement : tnode;
|
|
begin
|
|
consume(_WITH);
|
|
with_statement:=_with_statement();
|
|
end;
|
|
|
|
|
|
function raise_statement : tnode;
|
|
|
|
var
|
|
p,pobj,paddr,pframe : tnode;
|
|
|
|
begin
|
|
pobj:=nil;
|
|
paddr:=nil;
|
|
pframe:=nil;
|
|
consume(_RAISE);
|
|
if not(token in endtokens) then
|
|
begin
|
|
{ object }
|
|
pobj:=comp_expr(true);
|
|
if try_to_consume(_AT) then
|
|
begin
|
|
paddr:=comp_expr(true);
|
|
if try_to_consume(_COMMA) then
|
|
pframe:=comp_expr(true);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
if (block_type<>bt_except) then
|
|
Message(parser_e_no_reraise_possible);
|
|
end;
|
|
p:=craisenode.create(pobj,paddr,pframe);
|
|
raise_statement:=p;
|
|
end;
|
|
|
|
|
|
function try_statement : tnode;
|
|
|
|
var
|
|
p_try_block,p_finally_block,first,last,
|
|
p_default,p_specific,hp : tnode;
|
|
ot : ttype;
|
|
sym : tlocalvarsym;
|
|
old_block_type : tblock_type;
|
|
exceptsymtable : tsymtable;
|
|
objname,objrealname : stringid;
|
|
srsym : tsym;
|
|
srsymtable : tsymtable;
|
|
oldaktexceptblock: integer;
|
|
|
|
begin
|
|
include(current_procinfo.flags,pi_uses_exceptions);
|
|
|
|
p_default:=nil;
|
|
p_specific:=nil;
|
|
|
|
{ read statements to try }
|
|
consume(_TRY);
|
|
first:=nil;
|
|
inc(exceptblockcounter);
|
|
oldaktexceptblock := aktexceptblock;
|
|
aktexceptblock := exceptblockcounter;
|
|
|
|
while (token<>_FINALLY) and (token<>_EXCEPT) do
|
|
begin
|
|
if first=nil then
|
|
begin
|
|
last:=cstatementnode.create(statement,nil);
|
|
first:=last;
|
|
end
|
|
else
|
|
begin
|
|
tstatementnode(last).right:=cstatementnode.create(statement,nil);
|
|
last:=tstatementnode(last).right;
|
|
end;
|
|
if not try_to_consume(_SEMICOLON) then
|
|
break;
|
|
consume_emptystats;
|
|
end;
|
|
p_try_block:=cblocknode.create(first);
|
|
|
|
if try_to_consume(_FINALLY) then
|
|
begin
|
|
inc(exceptblockcounter);
|
|
aktexceptblock := exceptblockcounter;
|
|
p_finally_block:=statements_til_end;
|
|
try_statement:=ctryfinallynode.create(p_try_block,p_finally_block);
|
|
end
|
|
else
|
|
begin
|
|
consume(_EXCEPT);
|
|
old_block_type:=block_type;
|
|
block_type:=bt_except;
|
|
inc(exceptblockcounter);
|
|
aktexceptblock := exceptblockcounter;
|
|
ot:=generrortype;
|
|
p_specific:=nil;
|
|
if (idtoken=_ON) then
|
|
{ catch specific exceptions }
|
|
begin
|
|
repeat
|
|
consume(_ON);
|
|
if token=_ID then
|
|
begin
|
|
objname:=pattern;
|
|
objrealname:=orgpattern;
|
|
{ can't use consume_sym here, because we need already
|
|
to check for the colon }
|
|
searchsym(objname,srsym,srsymtable);
|
|
consume(_ID);
|
|
{ is a explicit name for the exception given ? }
|
|
if try_to_consume(_COLON) then
|
|
begin
|
|
consume_sym(srsym,srsymtable);
|
|
if (srsym.typ=typesym) and
|
|
is_class(ttypesym(srsym).restype.def) then
|
|
begin
|
|
ot:=ttypesym(srsym).restype;
|
|
sym:=tlocalvarsym.create(objrealname,vs_value,ot,[]);
|
|
end
|
|
else
|
|
begin
|
|
sym:=tlocalvarsym.create(objrealname,vs_value,generrortype,[]);
|
|
if (srsym.typ=typesym) then
|
|
Message1(type_e_class_type_expected,ttypesym(srsym).restype.def.typename)
|
|
else
|
|
Message1(type_e_class_type_expected,ot.def.typename);
|
|
end;
|
|
exceptsymtable:=tstt_exceptsymtable.create;
|
|
exceptsymtable.insert(sym);
|
|
{ insert the exception symtable stack }
|
|
exceptsymtable.next:=symtablestack;
|
|
symtablestack:=exceptsymtable;
|
|
end
|
|
else
|
|
begin
|
|
{ check if type is valid, must be done here because
|
|
with "e: Exception" the e is not necessary }
|
|
if srsym=nil then
|
|
begin
|
|
identifier_not_found(objrealname);
|
|
srsym:=generrorsym;
|
|
end;
|
|
{ support unit.identifier }
|
|
if srsym.typ=unitsym then
|
|
begin
|
|
consume(_POINT);
|
|
srsym:=searchsymonlyin(tunitsym(srsym).unitsymtable,pattern);
|
|
if srsym=nil then
|
|
begin
|
|
identifier_not_found(orgpattern);
|
|
srsym:=generrorsym;
|
|
end;
|
|
consume(_ID);
|
|
end;
|
|
{ check if type is valid, must be done here because
|
|
with "e: Exception" the e is not necessary }
|
|
if (srsym.typ=typesym) and
|
|
is_class(ttypesym(srsym).restype.def) then
|
|
ot:=ttypesym(srsym).restype
|
|
else
|
|
begin
|
|
ot:=generrortype;
|
|
if (srsym.typ=typesym) then
|
|
Message1(type_e_class_type_expected,ttypesym(srsym).restype.def.typename)
|
|
else
|
|
Message1(type_e_class_type_expected,ot.def.typename);
|
|
end;
|
|
exceptsymtable:=nil;
|
|
end;
|
|
end
|
|
else
|
|
consume(_ID);
|
|
consume(_DO);
|
|
hp:=connode.create(nil,statement);
|
|
if ot.def.deftype=errordef then
|
|
begin
|
|
hp.free;
|
|
hp:=cerrornode.create;
|
|
end;
|
|
if p_specific=nil then
|
|
begin
|
|
last:=hp;
|
|
p_specific:=last;
|
|
end
|
|
else
|
|
begin
|
|
tonnode(last).left:=hp;
|
|
last:=tonnode(last).left;
|
|
end;
|
|
{ set the informations }
|
|
{ only if the creation of the onnode was succesful, it's possible }
|
|
{ that last and hp are errornodes (JM) }
|
|
if last.nodetype = onn then
|
|
begin
|
|
tonnode(last).excepttype:=tobjectdef(ot.def);
|
|
tonnode(last).exceptsymtable:=exceptsymtable;
|
|
end;
|
|
{ remove exception symtable }
|
|
if assigned(exceptsymtable) then
|
|
begin
|
|
symtablestack:=symtablestack.next;
|
|
if last.nodetype <> onn then
|
|
exceptsymtable.free;
|
|
end;
|
|
if not try_to_consume(_SEMICOLON) then
|
|
break;
|
|
consume_emptystats;
|
|
until (token in [_END,_ELSE]);
|
|
if try_to_consume(_ELSE) then
|
|
begin
|
|
{ catch the other exceptions }
|
|
p_default:=statements_til_end;
|
|
end
|
|
else
|
|
consume(_END);
|
|
end
|
|
else
|
|
begin
|
|
{ catch all exceptions }
|
|
p_default:=statements_til_end;
|
|
end;
|
|
|
|
block_type:=old_block_type;
|
|
try_statement:=ctryexceptnode.create(p_try_block,p_specific,p_default);
|
|
end;
|
|
aktexceptblock := oldaktexceptblock;
|
|
end;
|
|
|
|
|
|
function _asm_statement : tnode;
|
|
var
|
|
asmstat : tasmnode;
|
|
Marker : tai;
|
|
reg : tregister;
|
|
asmreader : tbaseasmreader;
|
|
begin
|
|
Inside_asm_statement:=true;
|
|
if assigned(asmmodeinfos[aktasmmode]) then
|
|
begin
|
|
asmreader:=asmmodeinfos[aktasmmode]^.casmreader.create;
|
|
asmstat:=casmnode.create(asmreader.assemble as taasmoutput);
|
|
asmreader.free;
|
|
end
|
|
else
|
|
Message(parser_f_assembler_reader_not_supported);
|
|
|
|
{ Mark procedure that it has assembler blocks }
|
|
include(current_procinfo.flags,pi_has_assembler_block);
|
|
|
|
{ Read first the _ASM statement }
|
|
consume(_ASM);
|
|
|
|
{ END is read, got a list of changed registers? }
|
|
if try_to_consume(_LECKKLAMMER) then
|
|
begin
|
|
asmstat.used_regs_fpu:=[0..first_fpu_imreg-1];
|
|
if token<>_RECKKLAMMER then
|
|
begin
|
|
repeat
|
|
{ it's possible to specify the modified registers }
|
|
reg:=std_regnum_search(lower(pattern));
|
|
if reg<>NR_NO then
|
|
begin
|
|
if getregtype(reg)=R_INTREGISTER then
|
|
include(asmstat.used_regs_int,getsupreg(reg));
|
|
end
|
|
else
|
|
Message(asmr_e_invalid_register);
|
|
consume(_CSTRING);
|
|
if not try_to_consume(_COMMA) then
|
|
break;
|
|
until false;
|
|
end;
|
|
consume(_RECKKLAMMER);
|
|
end
|
|
else
|
|
begin
|
|
asmstat.used_regs_int:=paramanager.get_volatile_registers_int(current_procinfo.procdef.proccalloption);
|
|
asmstat.used_regs_fpu:=paramanager.get_volatile_registers_fpu(current_procinfo.procdef.proccalloption);
|
|
end;
|
|
|
|
{ mark the start and the end of the assembler block
|
|
this is needed for the optimizer }
|
|
If Assigned(AsmStat.p_asm) Then
|
|
Begin
|
|
Marker := Tai_Marker.Create(AsmBlockStart);
|
|
AsmStat.p_asm.Insert(Marker);
|
|
Marker := Tai_Marker.Create(AsmBlockEnd);
|
|
AsmStat.p_asm.Concat(Marker);
|
|
End;
|
|
Inside_asm_statement:=false;
|
|
_asm_statement:=asmstat;
|
|
end;
|
|
|
|
|
|
function statement : tnode;
|
|
var
|
|
p : tnode;
|
|
code : tnode;
|
|
filepos : tfileposinfo;
|
|
srsym : tsym;
|
|
srsymtable : tsymtable;
|
|
s : stringid;
|
|
begin
|
|
filepos:=akttokenpos;
|
|
case token of
|
|
_GOTO :
|
|
begin
|
|
if not(cs_support_goto in aktmoduleswitches)then
|
|
Message(sym_e_goto_and_label_not_supported);
|
|
consume(_GOTO);
|
|
if (token<>_INTCONST) and (token<>_ID) then
|
|
begin
|
|
Message(sym_e_label_not_found);
|
|
code:=cerrornode.create;
|
|
end
|
|
else
|
|
begin
|
|
if token=_ID then
|
|
consume_sym(srsym,srsymtable)
|
|
else
|
|
begin
|
|
searchsym(pattern,srsym,srsymtable);
|
|
if srsym=nil then
|
|
begin
|
|
identifier_not_found(pattern);
|
|
srsym:=generrorsym;
|
|
srsymtable:=nil;
|
|
end;
|
|
consume(token);
|
|
end;
|
|
|
|
if srsym.typ<>labelsym then
|
|
begin
|
|
Message(sym_e_id_is_no_label_id);
|
|
code:=cerrornode.create;
|
|
end
|
|
else
|
|
begin
|
|
{ goto is only allowed to labels within the current scope }
|
|
if srsym.owner<>current_procinfo.procdef.localst then
|
|
CGMessage(parser_e_goto_outside_proc);
|
|
code:=cgotonode.create_sym(tlabelsym(srsym));
|
|
tgotonode(code).labelsym:=tlabelsym(srsym);
|
|
{ set flag that this label is used }
|
|
tlabelsym(srsym).used:=true;
|
|
end;
|
|
end;
|
|
end;
|
|
_BEGIN :
|
|
code:=statement_block(_BEGIN);
|
|
_IF :
|
|
code:=if_statement;
|
|
_CASE :
|
|
code:=case_statement;
|
|
_REPEAT :
|
|
code:=repeat_statement;
|
|
_WHILE :
|
|
code:=while_statement;
|
|
_FOR :
|
|
code:=for_statement;
|
|
_WITH :
|
|
code:=with_statement;
|
|
_TRY :
|
|
code:=try_statement;
|
|
_RAISE :
|
|
code:=raise_statement;
|
|
{ semicolons,else until and end are ignored }
|
|
_SEMICOLON,
|
|
_ELSE,
|
|
_UNTIL,
|
|
_END:
|
|
code:=cnothingnode.create;
|
|
_FAIL :
|
|
begin
|
|
if (current_procinfo.procdef.proctypeoption<>potype_constructor) then
|
|
Message(parser_e_fail_only_in_constructor);
|
|
consume(_FAIL);
|
|
code:=call_fail_node;
|
|
end;
|
|
_ASM :
|
|
code:=_asm_statement;
|
|
_EOF :
|
|
Message(scan_f_end_of_file);
|
|
else
|
|
begin
|
|
p:=expr;
|
|
{ save the pattern here for latter usage, the label could be "000",
|
|
even if we read an expression, the pattern is still valid if it's really
|
|
a label (FK)
|
|
if you want to mess here, take care of
|
|
tests/webtbs/tw3546.pp
|
|
}
|
|
s:=pattern;
|
|
|
|
{ When a colon follows a intconst then transform it into a label }
|
|
if (p.nodetype=ordconstn) and
|
|
try_to_consume(_COLON) then
|
|
begin
|
|
p.free;
|
|
searchsym(s,srsym,srsymtable);
|
|
if assigned(srsym) and
|
|
(srsym.typ=labelsym) then
|
|
begin
|
|
if tlabelsym(srsym).defined then
|
|
Message(sym_e_label_already_defined);
|
|
tlabelsym(srsym).defined:=true;
|
|
p:=clabelnode.create(nil);
|
|
tlabelsym(srsym).code:=p;
|
|
end
|
|
else
|
|
begin
|
|
Message1(sym_e_label_used_and_not_defined,s);
|
|
p:=cnothingnode.create;
|
|
end;
|
|
end;
|
|
|
|
if p.nodetype=labeln then
|
|
begin
|
|
{ the pointer to the following instruction }
|
|
{ isn't a very clean way }
|
|
if token in endtokens then
|
|
tlabelnode(p).left:=cnothingnode.create
|
|
else
|
|
tlabelnode(p).left:=statement();
|
|
{ be sure to have left also resulttypepass }
|
|
resulttypepass(tlabelnode(p).left);
|
|
end
|
|
else
|
|
|
|
{ change a load of a procvar to a call. this is also
|
|
supported in fpc mode }
|
|
if p.nodetype in [vecn,derefn,typeconvn,subscriptn,loadn] then
|
|
maybe_call_procvar(p,false);
|
|
|
|
{ blockn support because a read/write is changed into a blocknode }
|
|
{ with a separate statement for each read/write operation (JM) }
|
|
{ the same is true for val() if the third parameter is not 32 bit }
|
|
if not(p.nodetype in [nothingn,calln,ifn,assignn,breakn,inlinen,
|
|
continuen,labeln,blockn,exitn]) then
|
|
Message(parser_e_illegal_expression);
|
|
|
|
{ Specify that we don't use the value returned by the call.
|
|
This is used for :
|
|
- dispose of temp stack space
|
|
- dispose on FPU stack }
|
|
if (p.nodetype=calln) then
|
|
exclude(tcallnode(p).callnodeflags,cnf_return_value_used);
|
|
|
|
code:=p;
|
|
end;
|
|
end;
|
|
if assigned(code) then
|
|
begin
|
|
resulttypepass(code);
|
|
code.fileinfo:=filepos;
|
|
end;
|
|
statement:=code;
|
|
end;
|
|
|
|
|
|
function statement_block(starttoken : ttoken) : tnode;
|
|
|
|
var
|
|
first,last : tnode;
|
|
filepos : tfileposinfo;
|
|
|
|
begin
|
|
first:=nil;
|
|
filepos:=akttokenpos;
|
|
consume(starttoken);
|
|
|
|
while not(token in [_END,_FINALIZATION]) do
|
|
begin
|
|
if first=nil then
|
|
begin
|
|
last:=cstatementnode.create(statement,nil);
|
|
first:=last;
|
|
end
|
|
else
|
|
begin
|
|
tstatementnode(last).right:=cstatementnode.create(statement,nil);
|
|
last:=tstatementnode(last).right;
|
|
end;
|
|
if (token in [_END,_FINALIZATION]) then
|
|
break
|
|
else
|
|
begin
|
|
{ if no semicolon, then error and go on }
|
|
if token<>_SEMICOLON then
|
|
begin
|
|
consume(_SEMICOLON);
|
|
consume_all_until(_SEMICOLON);
|
|
end;
|
|
consume(_SEMICOLON);
|
|
end;
|
|
consume_emptystats;
|
|
end;
|
|
|
|
{ don't consume the finalization token, it is consumed when
|
|
reading the finalization block, but allow it only after
|
|
an initalization ! }
|
|
if (starttoken<>_INITIALIZATION) or (token<>_FINALIZATION) then
|
|
consume(_END);
|
|
|
|
last:=cblocknode.create(first);
|
|
last.fileinfo:=filepos;
|
|
statement_block:=last;
|
|
end;
|
|
|
|
|
|
function assembler_block : tnode;
|
|
var
|
|
p : tnode;
|
|
locals : longint;
|
|
begin
|
|
{ Rename the funcret so that recursive calls are possible }
|
|
if not is_void(current_procinfo.procdef.rettype.def) then
|
|
symtablestack.rename(current_procinfo.procdef.resultname,'$hiddenresult');
|
|
|
|
{ delphi uses register calling for assembler methods }
|
|
if (m_delphi in aktmodeswitches) and
|
|
(po_assembler in current_procinfo.procdef.procoptions) and
|
|
not(po_hascallingconvention in current_procinfo.procdef.procoptions) then
|
|
current_procinfo.procdef.proccalloption:=pocall_register;
|
|
|
|
{ force the asm statement }
|
|
if token<>_ASM then
|
|
consume(_ASM);
|
|
include(current_procinfo.flags,pi_is_assembler);
|
|
p:=_asm_statement;
|
|
|
|
{$ifndef sparc}
|
|
{$ifndef arm}
|
|
if (po_assembler in current_procinfo.procdef.procoptions) then
|
|
begin
|
|
{ set the framepointer to esp for assembler functions when the
|
|
following conditions are met:
|
|
- if the are no local variables and parameters (except the allocated result)
|
|
- no reference to the result variable (refcount<=1)
|
|
- result is not stored as parameter
|
|
- target processor has optional frame pointer save
|
|
(vm, i386, vm only currently)
|
|
}
|
|
locals:=0;
|
|
current_procinfo.procdef.localst.foreach_static(@count_locals,@locals);
|
|
current_procinfo.procdef.parast.foreach_static(@count_locals,@locals);
|
|
if (locals=0) and
|
|
(current_procinfo.procdef.owner.symtabletype<>objectsymtable) and
|
|
(not assigned(current_procinfo.procdef.funcretsym) or
|
|
(tabstractvarsym(current_procinfo.procdef.funcretsym).refcount<=1)) and
|
|
not(paramanager.ret_in_param(current_procinfo.procdef.rettype.def,current_procinfo.procdef.proccalloption)) then
|
|
begin
|
|
{ Only need to set the framepointer, the locals will
|
|
be inserted with the correct reference in tcgasmnode.pass_2 }
|
|
current_procinfo.framepointer:=NR_STACK_POINTER_REG;
|
|
end;
|
|
end;
|
|
{$endif arm}
|
|
{$endif sparc}
|
|
|
|
{ Flag the result as assigned when it is returned in a
|
|
register.
|
|
}
|
|
if assigned(current_procinfo.procdef.funcretsym) and
|
|
(not paramanager.ret_in_param(current_procinfo.procdef.rettype.def,current_procinfo.procdef.proccalloption)) then
|
|
tabstractvarsym(current_procinfo.procdef.funcretsym).varstate:=vs_assigned;
|
|
|
|
{ because the END is already read we need to get the
|
|
last_endtoken_filepos here (PFV) }
|
|
last_endtoken_filepos:=akttokenpos;
|
|
|
|
assembler_block:=p;
|
|
end;
|
|
|
|
end.
|