/usr/share/fpcsrc/2.6.2/compiler/psub.pas is in fpc-source-2.6.2 2.6.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (c) 1998-2002 by Florian Klaempfl, Daniel Mantione
Does the parsing and codegeneration at subroutine level
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit psub;
{$i fpcdefs.inc}
interface
uses
cclasses,globals,
node,nbas,
symdef,procinfo,optdfa;
type
tcgprocinfo = class(tprocinfo)
private
procedure maybe_add_constructor_wrapper(var tocode: tnode; withexceptblock: boolean);
procedure add_entry_exit_code;
public
{ code for the subroutine as tree }
code : tnode;
{ positions in the tree for init/final }
entry_asmnode,
loadpara_asmnode,
exitlabel_asmnode,
stackcheck_asmnode,
init_asmnode,
final_asmnode : tasmnode;
dfabuilder : TDFABuilder;
destructor destroy;override;
procedure printproc(pass:string);
procedure generate_code;
procedure resetprocdef;
procedure add_to_symtablestack;
procedure remove_from_symtablestack;
procedure parse_body;
function has_assembler_child : boolean;
end;
procedure printnode_reset;
{ reads the declaration blocks }
procedure read_declarations(islibrary : boolean);
{ reads declarations in the interface part of a unit }
procedure read_interface_declarations;
procedure generate_specialization_procs;
implementation
uses
sysutils,
{ common }
cutils,
{ global }
globtype,tokens,verbose,comphook,constexp,
systems,
{ aasm }
cpuinfo,cpubase,aasmbase,aasmtai,aasmdata,
{ symtable }
symconst,symbase,symsym,symtype,symtable,defutil,
paramgr,
ppu,fmodule,
{ pass 1 }
nutils,nld,ncal,ncon,nflw,nadd,ncnv,nmem,
pass_1,
{$ifdef state_tracking}
nstate,
{$endif state_tracking}
{ pass 2 }
{$ifndef NOPASS2}
pass_2,
{$endif}
{ parser }
scanner,import,gendef,
pbase,pstatmnt,pdecl,pdecsub,pexports,
{ codegen }
tgobj,cgbase,cgobj,cgcpu,dbgbase,
ncgutil,regvars,
optbase,
opttail,
optcse,optloop,
optutils
{$if defined(arm) or defined(powerpc) or defined(powerpc64)}
,aasmcpu
{$endif arm}
{$ifndef NOOPT}
{$ifdef i386}
,aopt386
{$else i386}
,aopt
{$endif i386}
{$endif}
;
{****************************************************************************
PROCEDURE/FUNCTION BODY PARSING
****************************************************************************}
procedure initializevars(p:TObject;arg:pointer);
var
b : tblocknode;
begin
if not (tsym(p).typ in [localvarsym,staticvarsym]) then
exit;
with tabstractnormalvarsym(p) do
begin
if assigned(defaultconstsym) then
begin
b:=tblocknode(arg);
b.left:=cstatementnode.create(
cassignmentnode.create(
cloadnode.create(tsym(p),tsym(p).owner),
cloadnode.create(defaultconstsym,defaultconstsym.owner)),
b.left);
end;
end;
end;
procedure check_finalize_paras(p:TObject;arg:pointer);
begin
if (tsym(p).typ=paravarsym) and
(tparavarsym(p).varspez=vs_value) and
is_managed_type(tparavarsym(p).vardef) then
include(current_procinfo.flags,pi_needs_implicit_finally);
end;
procedure check_finalize_locals(p:TObject;arg:pointer);
begin
{ include the result: it needs to be finalized in case an exception }
{ occurs }
if (tsym(p).typ=localvarsym) and
(tlocalvarsym(p).refs>0) and
is_managed_type(tlocalvarsym(p).vardef) then
include(current_procinfo.flags,pi_needs_implicit_finally);
end;
function block(islibrary : boolean) : tnode;
var
oldfilepos: tfileposinfo;
begin
{ parse const,types and vars }
read_declarations(islibrary);
{ do we have an assembler block without the po_assembler?
we should allow this for Delphi compatibility (PFV) }
if (token=_ASM) and (m_delphi in current_settings.modeswitches) then
include(current_procinfo.procdef.procoptions,po_assembler);
{ Handle assembler block different }
if (po_assembler in current_procinfo.procdef.procoptions) then
begin
block:=assembler_block;
exit;
end;
{Unit initialization?.}
if (
assigned(current_procinfo.procdef.localst) and
(current_procinfo.procdef.localst.symtablelevel=main_program_level) and
(current_module.is_unit or islibrary)
) then
begin
if (token=_END) then
begin
consume(_END);
{ We need at least a node, else the entry/exit code is not
generated and thus no PASCALMAIN symbol which we need (PFV) }
if islibrary then
block:=cnothingnode.create
else
block:=nil;
end
else
begin
if token=_INITIALIZATION then
begin
{ The library init code is already called and does not
need to be in the initfinal table (PFV) }
block:=statement_block(_INITIALIZATION);
{ optimize empty initialization block away }
if (block.nodetype=blockn) and (tblocknode(block).left=nil) then
FreeAndNil(block)
else
if not islibrary then
current_module.flags:=current_module.flags or uf_init;
end
else if token=_FINALIZATION then
begin
{ when a unit has only a finalization section, we can come to this
point when we try to read the nonh existing initalization section
so we've to check if we are really try to parse the finalization }
if current_procinfo.procdef.proctypeoption=potype_unitfinalize then
begin
block:=statement_block(_FINALIZATION);
{ optimize empty finalization block away }
if (block.nodetype=blockn) and (tblocknode(block).left=nil) then
FreeAndNil(block)
else
current_module.flags:=current_module.flags or uf_finalize;
end
else
block:=nil;
end
else
begin
{ The library init code is already called and does not
need to be in the initfinal table (PFV) }
if not islibrary then
current_module.flags:=current_module.flags or uf_init;
block:=statement_block(_BEGIN);
end;
end;
end
else
begin
block:=statement_block(_BEGIN);
if current_procinfo.procdef.localst.symtabletype=localsymtable then
begin
{ initialization of local variables with their initial
values: part of function entry }
oldfilepos:=current_filepos;
current_filepos:=current_procinfo.entrypos;
current_procinfo.procdef.localst.SymList.ForEachCall(@initializevars,block);
current_filepos:=oldfilepos;
end;
end;
end;
{****************************************************************************
PROCEDURE/FUNCTION COMPILING
****************************************************************************}
procedure printnode_reset;
begin
assign(printnodefile,treelogfilename);
{$I-}
rewrite(printnodefile);
{$I+}
if ioresult<>0 then
begin
Comment(V_Error,'Error creating '+treelogfilename);
exit;
end;
close(printnodefile);
end;
procedure add_label_init(p:TObject;arg:pointer);
begin
if tstoredsym(p).typ=labelsym then
begin
addstatement(tstatementnode(arg^),
cifnode.create(caddnode.create(equaln,
ccallnode.createintern('fpc_setjmp',
ccallparanode.create(cloadnode.create(tlabelsym(p).jumpbuf,tlabelsym(p).jumpbuf.owner),nil)),
cordconstnode.create(1,sinttype,true))
,cgotonode.create(tlabelsym(p)),nil)
);
end;
end;
function generate_bodyentry_block:tnode;
var
srsym : tsym;
para : tcallparanode;
newstatement : tstatementnode;
def : tabstractrecorddef;
begin
result:=internalstatements(newstatement);
if assigned(current_structdef) then
begin
{ a constructor needs a help procedure }
if (current_procinfo.procdef.proctypeoption=potype_constructor) then
begin
if is_class(current_structdef) or
(
is_objectpascal_helper(current_structdef) and
is_class(tobjectdef(current_structdef).extendeddef)
) then
begin
include(current_procinfo.flags,pi_needs_implicit_finally);
if is_objectpascal_helper(current_structdef) then
def:=tabstractrecorddef(tobjectdef(current_structdef).extendeddef)
else
def:=current_structdef;
srsym:=search_struct_member(def,'NEWINSTANCE');
if assigned(srsym) and
(srsym.typ=procsym) then
begin
{ if vmt>1 then newinstance }
addstatement(newstatement,cifnode.create(
caddnode.create(gtn,
ctypeconvnode.create_internal(
load_vmt_pointer_node,
voidpointertype),
cpointerconstnode.create(1,voidpointertype)),
cassignmentnode.create(
ctypeconvnode.create_internal(
load_self_pointer_node,
voidpointertype),
ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_vmt_pointer_node,[])),
nil));
end
else
internalerror(200305108);
end
else
if is_object(current_structdef) then
begin
{ parameter 3 : vmt_offset }
{ parameter 2 : address of pointer to vmt,
this is required to allow setting the vmt to -1 to indicate
that memory was allocated }
{ parameter 1 : self pointer }
para:=ccallparanode.create(
cordconstnode.create(tobjectdef(current_structdef).vmt_offset,s32inttype,false),
ccallparanode.create(
ctypeconvnode.create_internal(
load_vmt_pointer_node,
voidpointertype),
ccallparanode.create(
ctypeconvnode.create_internal(
load_self_pointer_node,
voidpointertype),
nil)));
addstatement(newstatement,cassignmentnode.create(
ctypeconvnode.create_internal(
load_self_pointer_node,
voidpointertype),
ccallnode.createintern('fpc_help_constructor',para)));
end
else
if not is_record(current_structdef) then
internalerror(200305103);
{ if self=nil then exit
calling fail instead of exit is useless because
there is nothing to dispose (PFV) }
if is_class_or_object(current_structdef) then
addstatement(newstatement,cifnode.create(
caddnode.create(equaln,
load_self_pointer_node,
cnilnode.create),
cexitnode.create(nil),
nil));
end;
{ maybe call BeforeDestruction for classes }
if (current_procinfo.procdef.proctypeoption=potype_destructor) and
is_class(current_structdef) then
begin
srsym:=search_struct_member(current_structdef,'BEFOREDESTRUCTION');
if assigned(srsym) and
(srsym.typ=procsym) then
begin
{ if vmt>0 then beforedestruction }
addstatement(newstatement,cifnode.create(
caddnode.create(gtn,
ctypeconvnode.create_internal(
load_vmt_pointer_node,ptrsinttype),
ctypeconvnode.create_internal(
cnilnode.create,ptrsinttype)),
ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]),
nil));
end
else
internalerror(200305104);
end;
end;
if m_non_local_goto in current_settings.modeswitches then
tsymtable(current_procinfo.procdef.localst).SymList.ForEachCall(@add_label_init,@newstatement);
end;
function generate_bodyexit_block:tnode;
var
srsym : tsym;
para : tcallparanode;
newstatement : tstatementnode;
oldlocalswitches: tlocalswitches;
begin
result:=internalstatements(newstatement);
if assigned(current_structdef) then
begin
{ Don't test self and the vmt here. The reason is that }
{ a constructor already checks whether these are valid }
{ before. Further, in case of TThread the thread may }
{ free the class instance right after AfterConstruction }
{ has been called, so it may no longer be valid (JM) }
oldlocalswitches:=current_settings.localswitches;
current_settings.localswitches:=oldlocalswitches-[cs_check_object,cs_check_range];
{ a destructor needs a help procedure }
if (current_procinfo.procdef.proctypeoption=potype_destructor) then
begin
if is_class(current_structdef) then
begin
srsym:=search_struct_member(current_structdef,'FREEINSTANCE');
if assigned(srsym) and
(srsym.typ=procsym) then
begin
{ if self<>0 and vmt<>0 then freeinstance }
addstatement(newstatement,cifnode.create(
caddnode.create(andn,
caddnode.create(unequaln,
load_self_pointer_node,
cnilnode.create),
caddnode.create(unequaln,
ctypeconvnode.create(
load_vmt_pointer_node,
voidpointertype),
cpointerconstnode.create(0,voidpointertype))),
ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]),
nil));
end
else
internalerror(200305108);
end
else
if is_object(current_structdef) then
begin
{ finalize object data, but only if not in inherited call }
if is_managed_type(current_structdef) then
begin
addstatement(newstatement,cifnode.create(
caddnode.create(unequaln,
ctypeconvnode.create_internal(load_vmt_pointer_node,voidpointertype),
cnilnode.create),
finalize_data_node(load_self_node),
nil));
end;
{ parameter 3 : vmt_offset }
{ parameter 2 : pointer to vmt }
{ parameter 1 : self pointer }
para:=ccallparanode.create(
cordconstnode.create(tobjectdef(current_structdef).vmt_offset,s32inttype,false),
ccallparanode.create(
ctypeconvnode.create_internal(
load_vmt_pointer_node,
voidpointertype),
ccallparanode.create(
ctypeconvnode.create_internal(
load_self_pointer_node,
voidpointertype),
nil)));
addstatement(newstatement,
ccallnode.createintern('fpc_help_destructor',para));
end
else
internalerror(200305105);
end;
current_settings.localswitches:=oldlocalswitches;
end;
end;
function generate_except_block:tnode;
var
newstatement : tstatementnode;
{ safecall handling }
exceptobjnode,exceptaddrnode: ttempcreatenode;
sym,exceptsym: tsym;
begin
generate_except_block:=internalstatements(newstatement);
{ a constructor needs call destructor (if available) when it
is not inherited }
if not assigned(current_structdef) or
(current_procinfo.procdef.proctypeoption<>potype_constructor) then
begin
{ no constructor }
{ must be the return value finalized before reraising the exception? }
if (not is_void(current_procinfo.procdef.returndef)) and
is_managed_type(current_procinfo.procdef.returndef) and
(not paramanager.ret_in_param(current_procinfo.procdef.returndef, current_procinfo.procdef.proccalloption)) and
(not is_class(current_procinfo.procdef.returndef)) then
addstatement(newstatement,finalize_data_node(load_result_node));
{$if defined(x86) or defined(arm)}
{ safecall handling }
if (tf_safecall_exceptions in target_info.flags) and
(current_procinfo.procdef.proccalloption=pocall_safecall) then
begin
{ create a local hidden variable "safe_result" }
{ it will be used in ncgflw unit }
{ to set "real" result value for safecall routine }
sym:=tlocalvarsym.create('$safe_result',vs_value,hresultdef,[]);
include(sym.symoptions,sp_internal);
current_procinfo.procdef.localst.insert(sym);
{ if safecall is used for a class method we need to call }
{ SafecallException virtual method }
{ In other case we return E_UNEXPECTED error value }
if is_class(current_procinfo.procdef.struct) then
begin
{ temp variable to store exception address }
exceptaddrnode:=ctempcreatenode.create(voidpointertype,voidpointertype.size,
tt_persistent,true);
addstatement(newstatement,exceptaddrnode);
addstatement(newstatement,
cassignmentnode.create(
ctemprefnode.create(exceptaddrnode),
ccallnode.createintern('fpc_getexceptionaddr',nil)));
{ temp variable to store popped up exception }
exceptobjnode:=ctempcreatenode.create(class_tobject,class_tobject.size,
tt_persistent,true);
addstatement(newstatement,exceptobjnode);
addstatement(newstatement,
cassignmentnode.create(
ctemprefnode.create(exceptobjnode),
ccallnode.createintern('fpc_popobjectstack', nil)));
exceptsym:=search_struct_member(tobjectdef(current_procinfo.procdef.struct),'SAFECALLEXCEPTION');
addstatement(newstatement,
cassignmentnode.create(
cloadnode.create(sym,sym.Owner),
ccallnode.create(
ccallparanode.create(ctemprefnode.create(exceptaddrnode),
ccallparanode.create(ctemprefnode.create(exceptobjnode),nil)),
tprocsym(exceptsym), tprocsym(exceptsym).owner,load_self_node,[])));
addstatement(newstatement,ccallnode.createintern('fpc_destroyexception',
ccallparanode.create(ctemprefnode.create(exceptobjnode),nil)));
addstatement(newstatement,ctempdeletenode.create(exceptobjnode));
addstatement(newstatement,ctempdeletenode.create(exceptaddrnode));
end
else
begin
{ pop up and destroy an exception }
addstatement(newstatement,ccallnode.createintern('fpc_destroyexception',
ccallparanode.create(ccallnode.createintern('fpc_popobjectstack', nil),nil)));
addstatement(newstatement,
cassignmentnode.create(
cloadnode.create(sym,sym.Owner),
genintconstnode(HResult($8000FFFF))));
end;
end;
{$endif}
end;
end;
{****************************************************************************
TCGProcInfo
****************************************************************************}
destructor tcgprocinfo.destroy;
begin
if assigned(code) then
code.free;
inherited destroy;
end;
procedure tcgprocinfo.printproc(pass:string);
begin
assign(printnodefile,treelogfilename);
{$I-}
append(printnodefile);
if ioresult<>0 then
rewrite(printnodefile);
{$I+}
if ioresult<>0 then
begin
Comment(V_Error,'Error creating '+treelogfilename);
exit;
end;
writeln(printnodefile);
writeln(printnodefile,'*******************************************************************************');
writeln(printnodefile, pass);
writeln(printnodefile,procdef.fullprocname(false));
writeln(printnodefile,'*******************************************************************************');
printnode(printnodefile,code);
close(printnodefile);
end;
procedure tcgprocinfo.maybe_add_constructor_wrapper(var tocode: tnode; withexceptblock: boolean);
var
oldlocalswitches: tlocalswitches;
srsym: tsym;
afterconstructionblock,
exceptblock,
newblock: tblocknode;
newstatement: tstatementnode;
pd: tprocdef;
begin
if assigned(current_structdef) and
(current_procinfo.procdef.proctypeoption=potype_constructor) then
begin
{ Don't test self and the vmt here. See generate_bodyexit_block }
{ why (JM) }
oldlocalswitches:=current_settings.localswitches;
current_settings.localswitches:=oldlocalswitches-[cs_check_object,cs_check_range];
{ call AfterConstruction for classes }
if is_class(current_structdef) then
begin
srsym:=search_struct_member(current_structdef,'AFTERCONSTRUCTION');
if assigned(srsym) and
(srsym.typ=procsym) then
begin
current_filepos:=exitpos;
afterconstructionblock:=internalstatements(newstatement);
{ first execute all constructor code. If no exception
occurred then we will execute afterconstruction,
otherwise we won't (the exception will jump over us) }
addstatement(newstatement,tocode);
{ Self can be nil when fail is called }
{ if self<>nil and vmt<>nil then afterconstruction }
addstatement(newstatement,cifnode.create(
caddnode.create(andn,
caddnode.create(unequaln,
load_self_node,
cnilnode.create),
caddnode.create(unequaln,
load_vmt_pointer_node,
cnilnode.create)),
ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]),
nil));
tocode:=afterconstructionblock;
end
else
internalerror(200305106);
end;
if withexceptblock and (current_structdef.typ=objectdef) then
begin
{ Generate the implicit "fail" code for a constructor (destroy
in case an exception happened) }
pd:=tobjectdef(current_structdef).find_destructor;
{ this will always be the case for classes, since tobject has
a destructor }
if assigned(pd) then
begin
current_filepos:=exitpos;
exceptblock:=internalstatements(newstatement);
{ first free the instance if non-nil }
{ if vmt<>0 then call destructor }
addstatement(newstatement,cifnode.create(
caddnode.create(unequaln,
load_vmt_pointer_node,
cnilnode.create),
{ cnf_create_failed -> don't call BeforeDestruction }
ccallnode.create(nil,tprocsym(pd.procsym),pd.procsym.owner,load_self_node,[cnf_create_failed]),
nil));
{ then re-raise the exception }
addstatement(newstatement,craisenode.create(nil,nil,nil));
current_filepos:=entrypos;
newblock:=internalstatements(newstatement);
{ try
tocode
except
exceptblock
end
}
addstatement(newstatement,ctryexceptnode.create(
tocode,
nil,
exceptblock));
tocode:=newblock;
end;
end;
current_settings.localswitches:=oldlocalswitches;
end;
end;
procedure tcgprocinfo.add_entry_exit_code;
var
finalcode,
bodyentrycode,
bodyexitcode,
exceptcode,
wrappedbody: tnode;
newblock : tblocknode;
codestatement,
newstatement : tstatementnode;
oldfilepos : tfileposinfo;
begin
oldfilepos:=current_filepos;
{ Generate code/locations used at start of proc }
current_filepos:=entrypos;
entry_asmnode:=casmnode.create_get_position;
loadpara_asmnode:=casmnode.create_get_position;
stackcheck_asmnode:=casmnode.create_get_position;
init_asmnode:=casmnode.create_get_position;
bodyentrycode:=generate_bodyentry_block;
{ Generate code/locations used at end of proc }
current_filepos:=exitpos;
exitlabel_asmnode:=casmnode.create_get_position;
final_asmnode:=casmnode.create_get_position;
bodyexitcode:=generate_bodyexit_block;
{ Generate procedure by combining init+body+final,
depending on the implicit finally we need to add
an try...finally...end wrapper }
newblock:=internalstatements(newstatement);
if (cs_implicit_exceptions in current_settings.moduleswitches) and
(pi_needs_implicit_finally in flags) and
{ but it's useless in init/final code of units }
not(procdef.proctypeoption in [potype_unitfinalize,potype_unitinit]) then
begin
{ Generate special exception block only needed when
implicit finaly is used }
current_filepos:=exitpos;
exceptcode:=generate_except_block;
{ Generate code that will be in the try...finally }
finalcode:=internalstatements(codestatement);
addstatement(codestatement,final_asmnode);
{ Initialize before try...finally...end frame }
addstatement(newstatement,loadpara_asmnode);
addstatement(newstatement,stackcheck_asmnode);
addstatement(newstatement,entry_asmnode);
addstatement(newstatement,init_asmnode);
addstatement(newstatement,bodyentrycode);
current_filepos:=entrypos;
wrappedbody:=ctryfinallynode.create_implicit(
code,
finalcode,
exceptcode);
{ afterconstruction must be called after final_asmnode, because it
has to execute after the temps have been finalised in case of a
refcounted class (afterconstruction decreases the refcount
without freeing the instance if the count becomes nil, while
the finalising of the temps can free the instance) }
maybe_add_constructor_wrapper(wrappedbody,true);
addstatement(newstatement,wrappedbody);
addstatement(newstatement,exitlabel_asmnode);
addstatement(newstatement,bodyexitcode);
{ set flag the implicit finally has been generated }
include(flags,pi_has_implicit_finally);
end
else
begin
maybe_add_constructor_wrapper(code,false);
addstatement(newstatement,loadpara_asmnode);
addstatement(newstatement,stackcheck_asmnode);
addstatement(newstatement,entry_asmnode);
addstatement(newstatement,init_asmnode);
addstatement(newstatement,bodyentrycode);
addstatement(newstatement,code);
addstatement(newstatement,exitlabel_asmnode);
addstatement(newstatement,bodyexitcode);
addstatement(newstatement,final_asmnode);
end;
do_firstpass(tnode(newblock));
code:=newblock;
current_filepos:=oldfilepos;
end;
procedure clearrefs(p:TObject;arg:pointer);
begin
if (tsym(p).typ in [localvarsym,paravarsym,staticvarsym]) then
if tabstractvarsym(p).refs>1 then
tabstractvarsym(p).refs:=1;
end;
procedure translate_registers(p:TObject;list:pointer);
begin
if (tsym(p).typ in [localvarsym,paravarsym,staticvarsym]) and
(tabstractnormalvarsym(p).localloc.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_MMREGISTER,
LOC_CMMREGISTER,LOC_FPUREGISTER,LOC_CFPUREGISTER]) then
begin
if not(cs_no_regalloc in current_settings.globalswitches) then
cg.translate_register(tabstractnormalvarsym(p).localloc.register);
if cs_asm_source in current_settings.globalswitches then
TAsmList(list).concat(Tai_comment.Create(strpnew('Var '+tabstractnormalvarsym(p).realname+' located in register '+
std_regname(tabstractnormalvarsym(p).localloc.register))))
end;
end;
function tcgprocinfo.has_assembler_child : boolean;
var
hp : tprocinfo;
begin
result:=false;
hp:=get_first_nestedproc;
while assigned(hp) do
begin
if (hp.flags*[pi_has_assembler_block,pi_is_assembler])<>[] then
begin
result:=true;
exit;
end;
hp:=tprocinfo(hp.next);
end;
end;
procedure tcgprocinfo.generate_code;
var
old_current_procinfo : tprocinfo;
oldmaxfpuregisters : longint;
oldfilepos : tfileposinfo;
old_current_structdef : tabstractrecorddef;
templist : TAsmList;
headertai : tai;
i : integer;
varsym : tabstractnormalvarsym;
{RedoDFA : boolean;}
begin
{ the initialization procedure can be empty, then we
don't need to generate anything. When it was an empty
procedure there would be at least a blocknode }
if not assigned(code) then
exit;
{ We need valid code }
if Errorcount<>0 then
exit;
{ No code can be generated for generic template }
if (df_generic in procdef.defoptions) then
internalerror(200511152);
{ The RA and Tempgen shall not be available yet }
if assigned(tg) then
internalerror(200309201);
old_current_procinfo:=current_procinfo;
oldfilepos:=current_filepos;
old_current_structdef:=current_structdef;
oldmaxfpuregisters:=current_settings.maxfpuregisters;
current_procinfo:=self;
current_filepos:=entrypos;
current_structdef:=procdef.struct;
templist:=TAsmList.create;
{ add parast/localst to symtablestack }
add_to_symtablestack;
{ clear register count }
procdef.localst.SymList.ForEachCall(@clearrefs,nil);
procdef.parast.SymList.ForEachCall(@clearrefs,nil);
{ there's always a call to FPC_INITIALIZEUNITS/FPC_DO_EXIT in the main program }
if (procdef.localst.symtablelevel=main_program_level) and
(not current_module.is_unit) then
include(flags,pi_do_call);
{ set implicit_finally flag when there are locals/paras to be finalized }
procdef.parast.SymList.ForEachCall(@check_finalize_paras,nil);
procdef.localst.SymList.ForEachCall(@check_finalize_locals,nil);
{$if defined(x86) or defined(arm)}
{ set implicit_finally flag for if procedure is safecall }
if (tf_safecall_exceptions in target_info.flags) and
(procdef.proccalloption=pocall_safecall) then
include(flags, pi_needs_implicit_finally);
{$endif}
{ firstpass everything }
flowcontrol:=[];
do_firstpass(code);
{$ifdef i386}
procdef.fpu_used:=node_resources_fpu(code);
if procdef.fpu_used>0 then
include(flags,pi_uses_fpu);
{$endif i386}
{ Print the node to tree.log }
if paraprintnodetree=1 then
printproc( 'after the firstpass');
{ do this before adding the entry code else the tail recursion recognition won't work,
if this causes troubles, it must be if'ed
}
if (cs_opt_tailrecursion in current_settings.optimizerswitches) and
(pi_is_recursive in flags) then
do_opttail(code,procdef);
if (cs_opt_nodedfa in current_settings.optimizerswitches) and
{ creating dfa is not always possible }
((flags*[pi_has_assembler_block,pi_uses_exceptions,pi_is_assembler,
pi_needs_implicit_finally,pi_has_implicit_finally])=[]) then
begin
dfabuilder:=TDFABuilder.Create;
dfabuilder.createdfainfo(code);
{ when life info is available, we can give more sophisticated warning about unintialized
variables }
{ iterate through life info of the first node }
for i:=0 to dfabuilder.nodemap.count-1 do
begin
if DFASetIn(code.optinfo^.life,i) then
case tnode(dfabuilder.nodemap[i]).nodetype of
loadn:
begin
varsym:=tabstractnormalvarsym(tloadnode(dfabuilder.nodemap[i]).symtableentry);
{ Give warning/note for living locals }
if assigned(varsym.owner) and
not(vo_is_external in varsym.varoptions) then
begin
if (vo_is_funcret in varsym.varoptions) then
CGMessage(sym_w_function_result_uninitialized)
else
begin
if (varsym.owner=procdef.localst) and not (vo_is_typed_const in varsym.varoptions) then
CGMessage1(sym_w_uninitialized_local_variable,varsym.realname);
end;
end;
end;
end;
end;
include(flags,pi_dfaavailable);
end;
if (cs_opt_loopstrength in current_settings.optimizerswitches)
{ our induction variable strength reduction doesn't like
for loops with more than one entry }
and not(pi_has_label in current_procinfo.flags) then
begin
{RedoDFA:=}OptimizeInductionVariables(code);
end;
if cs_opt_nodecse in current_settings.optimizerswitches then
do_optcse(code);
{ add implicit entry and exit code }
add_entry_exit_code;
{ only do secondpass if there are no errors }
if (ErrorCount=0) then
begin
create_codegen;
{ set the start offset to the start of the temp area in the stack }
tg:=ttgobj.create;
{$if defined(x86) or defined(arm)}
{ try to strip the stack frame }
{ set the framepointer to esp if:
- no assembler directive, those are handled in assembler_block
in pstatment.pas (for cases not caught by the Delphi
exception below)
- no exceptions are used
- no pushes are used/esp modifications, could be:
* outgoing parameters on the stack
* incoming parameters on the stack
* open arrays
- no inline assembler
or
- Delphi mode
- assembler directive
- no pushes are used/esp modifications, could be:
* outgoing parameters on the stack
* incoming parameters on the stack
* open arrays
- no local variables
}
if ((po_assembler in procdef.procoptions) and
(m_delphi in current_settings.modeswitches) and
{ localst at main_program_level is a staticsymtable }
(procdef.localst.symtablelevel<>main_program_level) and
(tabstractlocalsymtable(procdef.localst).count_locals = 0)) or
((cs_opt_stackframe in current_settings.optimizerswitches) and
not(cs_generate_stackframes in current_settings.localswitches) and
not(po_assembler in procdef.procoptions) and
((flags*[pi_has_assembler_block,pi_uses_exceptions,pi_is_assembler,
pi_needs_implicit_finally,pi_has_implicit_finally,pi_has_stackparameter,
pi_needs_stackframe])=[])
)
then
begin
{ we need the parameter info here to determine if the procedure gets
parameters on the stack
calling generate_parameter_info doesn't hurt but it costs time
(necessary to init para_stack_size)
}
generate_parameter_info;
if not(procdef.stack_tainting_parameter(calleeside)) and
not(has_assembler_child) and (para_stack_size=0) then
begin
{ Only need to set the framepointer }
framepointer:=NR_STACK_POINTER_REG;
tg.direction:=1;
end;
end;
{$endif}
{ Create register allocator }
cg.init_register_allocators;
set_first_temp_offset;
generate_parameter_info;
{ allocate got register if needed }
current_procinfo.allocate_got_register(aktproccode);
{ Allocate space in temp/registers for parast and localst }
current_filepos:=entrypos;
gen_alloc_symtable(aktproccode,procdef.parast);
gen_alloc_symtable(aktproccode,procdef.localst);
{ Store temp offset for information about 'real' temps }
tempstart:=tg.lasttemp;
{ Generate code to load register parameters in temps and insert local
copies for values parameters. This must be done before the code for the
body is generated because the localloc is updated.
Note: The generated code will be inserted after the code generation of
the body is finished, because only then the position is known }
{$ifdef oldregvars}
assign_regvars(code);
{$endif oldreg}
current_filepos:=entrypos;
gen_load_para_value(templist);
{ caller paraloc info is also necessary in the stackframe_entry
code of the ppc (and possibly other processors) }
procdef.init_paraloc_info(callerside);
{ generate code for the node tree }
do_secondpass(code);
aktproccode.concatlist(current_asmdata.CurrAsmList);
{ The position of the loadpara_asmnode is now known }
aktproccode.insertlistafter(loadpara_asmnode.currenttai,templist);
{ first generate entry and initialize code with the correct
position and switches }
current_filepos:=entrypos;
current_settings.localswitches:=entryswitches;
cg.set_regalloc_live_range_direction(rad_backwards);
gen_entry_code(templist);
aktproccode.insertlistafter(entry_asmnode.currenttai,templist);
gen_initialize_code(templist);
aktproccode.insertlistafter(init_asmnode.currenttai,templist);
{ now generate finalize and exit code with the correct position
and switches }
current_filepos:=exitpos;
current_settings.localswitches:=exitswitches;
cg.set_regalloc_live_range_direction(rad_forward);
gen_finalize_code(templist);
{ the finalcode must be concated if there was no position available,
using insertlistafter will result in an insert at the start
when currentai=nil }
if assigned(final_asmnode.currenttai) then
aktproccode.insertlistafter(final_asmnode.currenttai,templist)
else
aktproccode.concatlist(templist);
{ insert exit label at the correct position }
cg.a_label(templist,CurrExitLabel);
if assigned(exitlabel_asmnode.currenttai) then
aktproccode.insertlistafter(exitlabel_asmnode.currenttai,templist)
else
aktproccode.concatlist(templist);
{ exit code }
gen_exit_code(templist);
aktproccode.concatlist(templist);
{$ifdef OLDREGVARS}
{ note: this must be done only after as much code as possible has }
{ been generated. The result is that when you ungetregister() a }
{ regvar, it will actually free the regvar (and alse free the }
{ the regvars at the same time). Doing this too early will }
{ confuse the register allocator, as the regvars will still be }
{ used. It should be done before loading the result regs (so }
{ they don't conflict with the regvars) and before }
{ gen_entry_code (that one has to be able to allocate the }
{ regvars again) (JM) }
free_regvars(aktproccode);
{$endif OLDREGVARS}
{ generate symbol and save end of header position }
current_filepos:=entrypos;
gen_proc_symbol(templist);
headertai:=tai(templist.last);
{ insert symbol }
aktproccode.insertlist(templist);
{ Free space in temp/registers for parast and localst, must be
done after gen_entry_code }
current_filepos:=exitpos;
{ make sure the got/pic register doesn't get freed in the }
{ middle of a loop }
if (cs_create_pic in current_settings.moduleswitches) and
(pi_needs_got in current_procinfo.flags) and
(current_procinfo.got<>NR_NO) then
cg.a_reg_sync(aktproccode,current_procinfo.got);
gen_free_symtable(aktproccode,procdef.localst);
gen_free_symtable(aktproccode,procdef.parast);
{ add code that will load the return value, this is not done
for assembler routines when they didn't reference the result
variable }
gen_load_return_value(templist);
aktproccode.concatlist(templist);
{ Already reserve all registers for stack checking code and
generate the call to the helper function }
if not(tf_no_generic_stackcheck in target_info.flags) and
(cs_check_stack in entryswitches) and
not(po_assembler in procdef.procoptions) and
(procdef.proctypeoption<>potype_proginit) then
begin
current_filepos:=entrypos;
gen_stack_check_call(templist);
aktproccode.insertlistafter(stackcheck_asmnode.currenttai,templist)
end;
{ this code (got loading) comes before everything which has }
{ already been generated, so reset the info about already }
{ backwards extended registers (so their live range can be }
{ extended backwards even further if needed) }
{ This code must be }
{ a) generated after do_secondpass has been called }
{ (because pi_needs_got may be set there) }
{ b) generated before register allocation, because the }
{ got/pic register can be a virtual one }
{ c) inserted before the entry code, because the entry }
{ code may need global symbols such as init rtti }
{ d) inserted after the stackframe allocation, because }
{ this register may have to be spilled }
cg.set_regalloc_live_range_direction(rad_backwards_reinit);
current_filepos:=entrypos;
{ load got if necessary }
cg.g_maybe_got_init(templist);
aktproccode.insertlistafter(headertai,templist);
{ re-enable if more code at the end is ever generated here
cg.set_regalloc_live_range_direction(rad_forward);
}
{ The procedure body is finished, we can now
allocate the registers }
cg.do_register_allocation(aktproccode,headertai);
{ translate imag. register to their real counter parts
this is necessary for debuginfo and verbose assembler output
when SSA will be implented, this will be more complicated because we've to
maintain location lists }
current_procinfo.procdef.parast.SymList.ForEachCall(@translate_registers,templist);
current_procinfo.procdef.localst.SymList.ForEachCall(@translate_registers,templist);
if (cs_create_pic in current_settings.moduleswitches) and
(pi_needs_got in current_procinfo.flags) and
not(cs_no_regalloc in current_settings.globalswitches) and
(current_procinfo.got<>NR_NO) then
cg.translate_register(current_procinfo.got);
{ Add save and restore of used registers }
current_filepos:=entrypos;
gen_save_used_regs(templist);
aktproccode.insertlistafter(headertai,templist);
current_filepos:=exitpos;
gen_restore_used_regs(aktproccode);
{ We know the size of the stack, now we can generate the
parameter that is passed to the stack checking code }
if not(tf_no_generic_stackcheck in target_info.flags) and
(cs_check_stack in entryswitches) and
not(po_assembler in procdef.procoptions) and
(procdef.proctypeoption<>potype_proginit) then
begin
current_filepos:=entrypos;
gen_stack_check_size_para(templist);
aktproccode.insertlistafter(stackcheck_asmnode.currenttai,templist)
end;
{ Add entry code (stack allocation) after header }
current_filepos:=entrypos;
gen_proc_entry_code(templist);
aktproccode.insertlistafter(headertai,templist);
{$if defined(x86) or defined(arm)}
{ Set return value of safecall procedure if implicit try/finally blocks are disabled }
if not (cs_implicit_exceptions in current_settings.moduleswitches) and
(tf_safecall_exceptions in target_info.flags) and
(procdef.proccalloption=pocall_safecall) then
cg.a_load_const_reg(aktproccode,OS_ADDR,0,NR_FUNCTION_RETURN_REG);
{$endif}
{ Add exit code at the end }
current_filepos:=exitpos;
gen_proc_exit_code(templist);
aktproccode.concatlist(templist);
{ check if the implicit finally has been generated. The flag
should already be set in pass1 }
if (cs_implicit_exceptions in current_settings.moduleswitches) and
not(procdef.proctypeoption in [potype_unitfinalize,potype_unitinit]) and
(pi_needs_implicit_finally in flags) and
not(pi_has_implicit_finally in flags) then
internalerror(200405231);
{$ifndef NoOpt}
if not(cs_no_regalloc in current_settings.globalswitches) then
begin
if (cs_opt_level1 in current_settings.optimizerswitches) and
{ do not optimize pure assembler procedures }
not(pi_is_assembler in flags) then
optimize(aktproccode);
end;
{$endif NoOpt}
{$ifdef ARM}
{ because of the limited constant size of the arm, all data access is done pc relative }
finalizearmcode(aktproccode,aktlocaldata);
{$endif ARM}
{ Add end symbol and debug info }
{ this must be done after the pcrelativedata is appended else the distance calculation of
insertpcrelativedata will be wrong, further the pc indirect data is part of the procedure
so it should be inserted before the end symbol (FK)
}
current_filepos:=exitpos;
gen_proc_symbol_end(templist);
aktproccode.concatlist(templist);
{$if defined(POWERPC) or defined(POWERPC64)}
fixup_jmps(aktproccode);
{$endif}
{ insert line debuginfo }
if (cs_debuginfo in current_settings.moduleswitches) or
(cs_use_lineinfo in current_settings.globalswitches) then
current_debuginfo.insertlineinfo(aktproccode);
{ add the procedure to the al_procedures }
maybe_new_object_file(current_asmdata.asmlists[al_procedures]);
new_section(current_asmdata.asmlists[al_procedures],sec_code,lower(procdef.mangledname),getprocalign);
current_asmdata.asmlists[al_procedures].concatlist(aktproccode);
{ save local data (casetable) also in the same file }
if assigned(aktlocaldata) and
(not aktlocaldata.empty) then
current_asmdata.asmlists[al_procedures].concatlist(aktlocaldata);
{ only now we can remove the temps }
tg.resettempgen;
{ stop tempgen and ra }
tg.free;
cg.done_register_allocators;
destroy_codegen;
tg:=nil;
end;
dfabuilder.free;
{ restore symtablestack }
remove_from_symtablestack;
{ restore }
templist.free;
current_settings.maxfpuregisters:=oldmaxfpuregisters;
current_filepos:=oldfilepos;
current_structdef:=old_current_structdef;
current_procinfo:=old_current_procinfo;
end;
procedure tcgprocinfo.add_to_symtablestack;
begin
{ insert symtables for the class, but only if it is no nested function }
if assigned(procdef.struct) and
not(assigned(parent) and
assigned(parent.procdef) and
assigned(parent.procdef.struct)) then
push_nested_hierarchy(procdef.struct);
{ insert parasymtable in symtablestack when parsing
a function }
if procdef.parast.symtablelevel>=normal_function_level then
symtablestack.push(procdef.parast);
{ insert localsymtable, except for the main procedure
(in that case the localst is the unit's static symtable,
which is already on the stack) }
if procdef.localst.symtablelevel>=normal_function_level then
symtablestack.push(procdef.localst);
end;
procedure tcgprocinfo.remove_from_symtablestack;
begin
{ remove localsymtable }
if procdef.localst.symtablelevel>=normal_function_level then
symtablestack.pop(procdef.localst);
{ remove parasymtable }
if procdef.parast.symtablelevel>=normal_function_level then
symtablestack.pop(procdef.parast);
{ remove symtables for the class, but only if it is no nested function }
if assigned(procdef.struct) and
not(assigned(parent) and
assigned(parent.procdef) and
assigned(parent.procdef.struct)) then
pop_nested_hierarchy(procdef.struct);
end;
procedure tcgprocinfo.resetprocdef;
begin
{ remove code tree, if not inline procedure }
if assigned(code) then
begin
{ the inline procedure has already got a copy of the tree
stored in procdef.inlininginfo }
code.free;
code:=nil;
end;
end;
function checknodeinlining(procdef: tprocdef): boolean;
var
i : integer;
currpara : tparavarsym;
begin
result := false;
if (pi_has_assembler_block in current_procinfo.flags) then
begin
Message1(parser_w_not_supported_for_inline,'assembler');
Message(parser_w_inlining_disabled);
exit;
end;
for i:=0 to procdef.paras.count-1 do
begin
currpara:=tparavarsym(procdef.paras[i]);
case currpara.vardef.typ of
formaldef :
begin
if (currpara.varspez in [vs_out,vs_var,vs_const,vs_constref]) then
begin
Message1(parser_w_not_supported_for_inline,'formal parameter');
Message(parser_w_inlining_disabled);
exit;
end;
end;
arraydef :
begin
if is_array_of_const(currpara.vardef) or
is_variant_array(currpara.vardef) then
begin
Message1(parser_w_not_supported_for_inline,'array of const');
Message(parser_w_inlining_disabled);
exit;
end;
{ open arrays might need re-basing of the index, i.e. if you pass
an array[1..10] as open array, you have to add 1 to all index operations
if you directly inline it }
if is_open_array(currpara.vardef) then
begin
Message1(parser_w_not_supported_for_inline,'open array');
Message(parser_w_inlining_disabled);
exit;
end;
end;
end;
end;
result:=true;
end;
procedure tcgprocinfo.parse_body;
var
old_current_procinfo : tprocinfo;
old_block_type : tblock_type;
st : TSymtable;
old_current_structdef: tabstractrecorddef;
old_current_genericdef,
old_current_specializedef: tstoreddef;
begin
old_current_procinfo:=current_procinfo;
old_block_type:=block_type;
old_current_structdef:=current_structdef;
old_current_genericdef:=current_genericdef;
old_current_specializedef:=current_specializedef;
current_procinfo:=self;
current_structdef:=procdef.struct;
if assigned(current_structdef) and (df_generic in current_structdef.defoptions) then
current_genericdef:=current_structdef;
if assigned(current_structdef) and (df_specialization in current_structdef.defoptions) then
current_specializedef:=current_structdef;
{ calculate the lexical level }
if procdef.parast.symtablelevel>maxnesting then
Message(parser_e_too_much_lexlevel);
block_type:=bt_body;
{$ifdef state_tracking}
{ aktstate:=Tstate_storage.create;}
{$endif state_tracking}
{ allocate the symbol for this procedure }
alloc_proc_symbol(procdef);
{ add parast/localst to symtablestack }
add_to_symtablestack;
{ save entry info }
entrypos:=current_filepos;
entryswitches:=current_settings.localswitches;
if (df_generic in procdef.defoptions) then
begin
{ start token recorder for generic template }
procdef.initgeneric;
current_scanner.startrecordtokens(procdef.generictokenbuf);
end;
{ parse the code ... }
code:=block(current_module.islibrary);
if (df_generic in procdef.defoptions) then
begin
{ stop token recorder for generic template }
current_scanner.stoprecordtokens;
{ Give an error for accesses in the static symtable that aren't visible
outside the current unit }
st:=procdef.owner;
while (st.symtabletype=ObjectSymtable) do
st:=st.defowner.owner;
if (pi_uses_static_symtable in flags) and
(st.symtabletype<>staticsymtable) then
Comment(V_Error,'Global Generic template references static symtable');
end;
{ save exit info }
exitswitches:=current_settings.localswitches;
exitpos:=last_endtoken_filepos;
{ the procedure is now defined }
procdef.forwarddef:=false;
if assigned(code) then
begin
{ get a better entry point }
entrypos:=code.fileinfo;
{ Finish type checking pass }
do_typecheckpass(code);
end;
{ Check for unused labels, forwards, symbols for procedures. Static
symtable is checked in pmodules.
The check must be done after the typecheckpass }
if (Errorcount=0) and
(tstoredsymtable(procdef.localst).symtabletype<>staticsymtable) then
begin
{ check if forwards are resolved }
tstoredsymtable(procdef.localst).check_forwards;
{ check if all labels are used }
tstoredsymtable(procdef.localst).checklabels;
{ check for unused symbols, but only if there is no asm block }
if not(pi_has_assembler_block in flags) then
begin
tstoredsymtable(procdef.localst).allsymbolsused;
tstoredsymtable(procdef.parast).allsymbolsused;
end;
end;
if (po_inline in procdef.procoptions) then
begin
{ Can we inline this procedure? }
if checknodeinlining(procdef) then
begin
new(procdef.inlininginfo);
include(procdef.procoptions,po_has_inlininginfo);
procdef.inlininginfo^.code:=code.getcopy;
procdef.inlininginfo^.flags:=current_procinfo.flags;
{ The blocknode needs to set an exit label }
if procdef.inlininginfo^.code.nodetype=blockn then
include(procdef.inlininginfo^.code.flags,nf_block_with_exit);
end;
end;
{ Print the node to tree.log }
if paraprintnodetree=1 then
printproc( 'after parsing');
{ ... remove symbol tables }
remove_from_symtablestack;
{$ifdef state_tracking}
{ aktstate.destroy;}
{$endif state_tracking}
current_structdef:=old_current_structdef;
current_genericdef:=old_current_genericdef;
current_specializedef:=old_current_specializedef;
current_procinfo:=old_current_procinfo;
{ Restore old state }
block_type:=old_block_type;
end;
{****************************************************************************
PROCEDURE/FUNCTION PARSING
****************************************************************************}
procedure check_init_paras(p:TObject;arg:pointer);
begin
if tsym(p).typ<>paravarsym then
exit;
with tparavarsym(p) do
if is_managed_type(vardef) and
(varspez in [vs_value,vs_out]) then
include(current_procinfo.flags,pi_do_call);
end;
procedure read_proc_body(old_current_procinfo:tprocinfo;pd:tprocdef);
{
Parses the procedure directives, then parses the procedure body, then
generates the code for it
}
procedure do_generate_code(pi:tcgprocinfo);
var
hpi : tcgprocinfo;
begin
{ generate code for this procedure }
pi.generate_code;
{ process nested procs }
hpi:=tcgprocinfo(pi.get_first_nestedproc);
while assigned(hpi) do
begin
do_generate_code(hpi);
hpi:=tcgprocinfo(hpi.next);
end;
pi.resetprocdef;
end;
var
oldfailtokenmode : tmodeswitch;
isnestedproc : boolean;
begin
Message1(parser_d_procedure_start,pd.fullprocname(false));
{ create a new procedure }
current_procinfo:=cprocinfo.create(old_current_procinfo);
current_module.procinfo:=current_procinfo;
current_procinfo.procdef:=pd;
isnestedproc:=(current_procinfo.procdef.parast.symtablelevel>normal_function_level);
{ Insert mangledname }
pd.aliasnames.insert(pd.mangledname);
{ Handle Export of this procedure }
if (po_exports in pd.procoptions) and
(target_info.system in [system_i386_os2,system_i386_emx]) then
begin
pd.aliasnames.insert(pd.procsym.realname);
if cs_link_deffile in current_settings.globalswitches then
deffile.AddExport(pd.mangledname);
end;
{ Insert result variables in the localst }
insert_funcret_local(pd);
{ check if there are para's which require initing -> set }
{ pi_do_call (if not yet set) }
if not(pi_do_call in current_procinfo.flags) then
pd.parast.SymList.ForEachCall(@check_init_paras,nil);
{ set _FAIL as keyword if constructor }
if (pd.proctypeoption=potype_constructor) then
begin
oldfailtokenmode:=tokeninfo^[_FAIL].keyword;
tokeninfo^[_FAIL].keyword:=m_all;
end;
tcgprocinfo(current_procinfo).parse_body;
{ We can't support inlining for procedures that have nested
procedures because the nested procedures use a fixed offset
for accessing locals in the parent procedure (PFV) }
if current_procinfo.has_nestedprocs then
begin
if (df_generic in current_procinfo.procdef.defoptions) then
Comment(V_Error,'Generic methods cannot have nested procedures')
else
if (po_inline in current_procinfo.procdef.procoptions) then
begin
Message1(parser_w_not_supported_for_inline,'nested procedures');
Message(parser_w_inlining_disabled);
exclude(current_procinfo.procdef.procoptions,po_inline);
end;
end;
{ When it's a nested procedure then defer the code generation,
when back at normal function level then generate the code
for all defered nested procedures and the current procedure }
if not isnestedproc then
begin
if not(df_generic in current_procinfo.procdef.defoptions) then
do_generate_code(tcgprocinfo(current_procinfo));
end;
{ reset _FAIL as _SELF normal }
if (pd.proctypeoption=potype_constructor) then
tokeninfo^[_FAIL].keyword:=oldfailtokenmode;
{ release procinfo }
if tprocinfo(current_module.procinfo)<>current_procinfo then
internalerror(200304274);
current_module.procinfo:=current_procinfo.parent;
{ For specialization we didn't record the last semicolon. Moving this parsing
into the parse_body routine is not done because of having better file position
information available }
if not(df_specialization in current_procinfo.procdef.defoptions) then
consume(_SEMICOLON);
if not isnestedproc then
{ current_procinfo is checked for nil later on }
freeandnil(current_procinfo);
end;
procedure read_proc(isclassmethod:boolean);
{
Parses the procedure directives, then parses the procedure body, then
generates the code for it
}
var
old_current_procinfo : tprocinfo;
old_current_structdef: tabstractrecorddef;
old_current_genericdef,
old_current_specializedef: tstoreddef;
pdflags : tpdflags;
pd,firstpd : tprocdef;
s : string;
begin
{ save old state }
old_current_procinfo:=current_procinfo;
old_current_structdef:=current_structdef;
old_current_genericdef:=current_genericdef;
old_current_specializedef:=current_specializedef;
{ reset current_procinfo.procdef to nil to be sure that nothing is writing
to another procdef }
current_procinfo:=nil;
current_structdef:=nil;
current_genericdef:=nil;
current_specializedef:=nil;
{ parse procedure declaration }
pd:=parse_proc_dec(isclassmethod,old_current_structdef);
{ set the default function options }
if parse_only then
begin
pd.forwarddef:=true;
{ set also the interface flag, for better error message when the
implementation doesn't much this header }
pd.interfacedef:=true;
include(pd.procoptions,po_global);
pdflags:=[pd_interface];
end
else
begin
pdflags:=[pd_body];
if (not current_module.in_interface) then
include(pdflags,pd_implemen);
if (not current_module.is_unit) or
create_smartlink or
{
taking addresses of static procedures goes wrong
if they aren't global when pic is used (FK)
}
(cs_create_pic in current_settings.moduleswitches) then
include(pd.procoptions,po_global);
pd.forwarddef:=false;
end;
{ parse the directives that may follow }
parse_proc_directives(pd,pdflags);
{ hint directives, these can be separated by semicolons here,
that needs to be handled here with a loop (PFV) }
while try_consume_hintdirective(pd.symoptions,pd.deprecatedmsg) do
Consume(_SEMICOLON);
{ Set calling convention }
handle_calling_convention(pd);
{ search for forward declarations }
if not proc_add_definition(pd) then
begin
{ A method must be forward defined (in the object declaration) }
if assigned(pd.struct) and
(not assigned(old_current_structdef)) then
begin
MessagePos1(pd.fileinfo,parser_e_header_dont_match_any_member,pd.fullprocname(false));
tprocsym(pd.procsym).write_parameter_lists(pd);
end
else
begin
{ Give a better error if there is a forward def in the interface and only
a single implementation }
firstpd:=tprocdef(tprocsym(pd.procsym).ProcdefList[0]);
if (not pd.forwarddef) and
(not pd.interfacedef) and
(tprocsym(pd.procsym).ProcdefList.Count>1) and
firstpd.forwarddef and
firstpd.interfacedef and
not(tprocsym(pd.procsym).ProcdefList.Count>2) and
{ don't give an error if it may be an overload }
not(m_fpc in current_settings.modeswitches) and
(not(po_overload in pd.procoptions) or
not(po_overload in firstpd.procoptions)) then
begin
MessagePos1(pd.fileinfo,parser_e_header_dont_match_forward,pd.fullprocname(false));
tprocsym(pd.procsym).write_parameter_lists(pd);
end;
end;
end;
{ Set mangled name }
proc_set_mangledname(pd);
{ compile procedure when a body is needed }
if (pd_body in pdflags) then
begin
read_proc_body(old_current_procinfo,pd);
end
else
begin
{ Handle imports }
if (po_external in pd.procoptions) then
begin
{ External declared in implementation, and there was already a
forward (or interface) declaration then we need to generate
a stub that calls the external routine }
if (not pd.forwarddef) and
(pd.hasforward)
{ it is unclear to me what's the use of the following condition,
so commented out, see also issue #18371 (FK)
and
not(
assigned(pd.import_dll) and
(target_info.system in [system_i386_wdosx,
system_arm_wince,system_i386_wince])
) } then
begin
s:=proc_get_importname(pd);
if s<>'' then
gen_external_stub(current_asmdata.asmlists[al_procedures],pd,s);
end;
{ Import DLL specified? }
if assigned(pd.import_dll) then
begin
if assigned (pd.import_name) then
current_module.AddExternalImport(pd.import_dll^,
pd.import_name^,proc_get_importname(pd),
pd.import_nr,false,false)
else
current_module.AddExternalImport(pd.import_dll^,
proc_get_importname(pd),proc_get_importname(pd),
pd.import_nr,false,true);
end
else
begin
{ add import name to external list for DLL scanning }
if tf_has_dllscanner in target_info.flags then
current_module.dllscannerinputlist.Add(proc_get_importname(pd),pd);
end;
end;
end;
{ make sure that references to forward-declared functions are not }
{ treated as references to external symbols, needed for darwin. }
{ make sure we don't change the binding of real external symbols }
if not(po_external in pd.procoptions) then
begin
if (po_global in pd.procoptions) or
(cs_profile in current_settings.moduleswitches) then
current_asmdata.DefineAsmSymbol(pd.mangledname,AB_GLOBAL,AT_FUNCTION)
else
current_asmdata.DefineAsmSymbol(pd.mangledname,AB_LOCAL,AT_FUNCTION);
end;
current_structdef:=old_current_structdef;
current_genericdef:=old_current_genericdef;
current_specializedef:=old_current_specializedef;
current_procinfo:=old_current_procinfo;
end;
{****************************************************************************
DECLARATION PARSING
****************************************************************************}
{ search in symtablestack for not complete classes }
procedure check_forward_class(p:TObject;arg:pointer);
begin
if (tsym(p).typ=typesym) and
(ttypesym(p).typedef.typ=objectdef) and
(oo_is_forward in tobjectdef(ttypesym(p).typedef).objectoptions) then
MessagePos1(tsym(p).fileinfo,sym_e_forward_type_not_resolved,tsym(p).realname);
end;
procedure read_declarations(islibrary : boolean);
var
is_classdef:boolean;
begin
is_classdef:=false;
repeat
if not assigned(current_procinfo) then
internalerror(200304251);
case token of
_LABEL:
label_dec;
_CONST:
const_dec;
_TYPE:
type_dec;
_VAR:
var_dec;
_THREADVAR:
threadvar_dec;
_CLASS:
begin
is_classdef:=false;
if try_to_consume(_CLASS) then
begin
{ class modifier is only allowed for procedures, functions, }
{ constructors, destructors, fields and properties }
if not(token in [_FUNCTION,_PROCEDURE,_PROPERTY,_VAR,_CONSTRUCTOR,_DESTRUCTOR,_OPERATOR]) and
not((token=_ID) and (idtoken=_OPERATOR)) then
Message(parser_e_procedure_or_function_expected);
if is_interface(current_structdef) then
Message(parser_e_no_static_method_in_interfaces)
else
{ class methods are also allowed for Objective-C protocols }
is_classdef:=true;
end;
end;
_CONSTRUCTOR,
_DESTRUCTOR,
_FUNCTION,
_PROCEDURE,
_OPERATOR:
begin
read_proc(is_classdef);
is_classdef:=false;
end;
_EXPORTS:
begin
if (current_procinfo.procdef.localst.symtablelevel>main_program_level) then
begin
Message(parser_e_syntax_error);
consume_all_until(_SEMICOLON);
end
else if islibrary or
(target_info.system in systems_unit_program_exports) then
read_exports
else
begin
Message(parser_w_unsupported_feature);
consume(_BEGIN);
end;
end
else
begin
case idtoken of
_RESOURCESTRING:
begin
{ m_class is needed, because the resourcestring
loading is in the ObjPas unit }
{ if (m_class in current_settings.modeswitches) then}
resourcestring_dec
{ else
break;}
end;
_OPERATOR:
begin
if is_classdef then
begin
read_proc(is_classdef);
is_classdef:=false;
end
else
break;
end;
_PROPERTY:
begin
if (m_fpc in current_settings.modeswitches) then
begin
property_dec(is_classdef);
is_classdef:=false;
end
else
break;
end;
else
break;
end;
end;
end;
until false;
{ check for incomplete class definitions, this is only required
for fpc modes }
if (m_fpc in current_settings.modeswitches) then
current_procinfo.procdef.localst.SymList.ForEachCall(@check_forward_class,nil);
end;
procedure read_interface_declarations;
begin
repeat
case token of
_CONST :
const_dec;
_TYPE :
type_dec;
_VAR :
var_dec;
_THREADVAR :
threadvar_dec;
_FUNCTION,
_PROCEDURE,
_OPERATOR :
read_proc(false);
else
begin
case idtoken of
_RESOURCESTRING :
resourcestring_dec;
_PROPERTY:
begin
if (m_fpc in current_settings.modeswitches) then
property_dec(false)
else
break;
end;
else
break;
end;
end;
end;
until false;
{ check for incomplete class definitions, this is only required
for fpc modes }
if (m_fpc in current_settings.modeswitches) then
symtablestack.top.SymList.ForEachCall(@check_forward_class,nil);
end;
{****************************************************************************
SPECIALIZATION BODY GENERATION
****************************************************************************}
procedure specialize_objectdefs(p:TObject;arg:pointer);
var
i : longint;
hp : tdef;
oldcurrent_filepos : tfileposinfo;
oldsymtablestack : tsymtablestack;
oldextendeddefs : TFPHashObjectList;
pu : tused_unit;
hmodule : tmodule;
specobj : tabstractrecorddef;
begin
if not((tsym(p).typ=typesym) and
(ttypesym(p).typedef.typesym=tsym(p)) and
(ttypesym(p).typedef.typ in [objectdef,recorddef]) and
(df_specialization in ttypesym(p).typedef.defoptions)
) then
exit;
{ Setup symtablestack a definition time }
specobj:=tabstractrecorddef(ttypesym(p).typedef);
if not (is_class_or_object(specobj) or is_record(specobj)) then
exit;
oldsymtablestack:=symtablestack;
oldextendeddefs:=current_module.extendeddefs;
current_module.extendeddefs:=TFPHashObjectList.create(true);
symtablestack:=tdefawaresymtablestack.create;
if not assigned(specobj.genericdef) then
internalerror(200705151);
hmodule:=find_module_from_symtable(specobj.genericdef.owner);
if hmodule=nil then
internalerror(200705152);
pu:=tused_unit(hmodule.used_units.first);
while assigned(pu) do
begin
if not assigned(pu.u.globalsymtable) then
internalerror(200705153);
symtablestack.push(pu.u.globalsymtable);
pu:=tused_unit(pu.next);
end;
if assigned(hmodule.globalsymtable) then
symtablestack.push(hmodule.globalsymtable);
if assigned(hmodule.localsymtable) then
symtablestack.push(hmodule.localsymtable);
{ procedure definitions for classes or objects }
for i:=0 to specobj.symtable.DefList.Count-1 do
begin
hp:=tdef(specobj.symtable.DefList[i]);
if hp.typ=procdef then
begin
if assigned(tprocdef(hp).genericdef) and
(tprocdef(hp).genericdef.typ=procdef) and
assigned(tprocdef(tprocdef(hp).genericdef).generictokenbuf) then
begin
oldcurrent_filepos:=current_filepos;
current_filepos:=tprocdef(tprocdef(hp).genericdef).fileinfo;
{ use the index the module got from the current compilation process }
current_filepos.moduleindex:=hmodule.unit_index;
current_tokenpos:=current_filepos;
current_scanner.startreplaytokens(tprocdef(tprocdef(hp).genericdef).generictokenbuf);
read_proc_body(nil,tprocdef(hp));
current_filepos:=oldcurrent_filepos;
end
else
MessagePos1(tprocdef(hp).fileinfo,sym_e_forward_not_resolved,tprocdef(hp).fullprocname(false));
end;
end;
{ Restore symtablestack }
current_module.extendeddefs.free;
current_module.extendeddefs:=oldextendeddefs;
symtablestack.free;
symtablestack:=oldsymtablestack;
end;
procedure generate_specialization_procs;
begin
if assigned(current_module.globalsymtable) then
current_module.globalsymtable.SymList.ForEachCall(@specialize_objectdefs,nil);
if assigned(current_module.localsymtable) then
current_module.localsymtable.SymList.ForEachCall(@specialize_objectdefs,nil);
end;
end.
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