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|
{
Copyright (c) 2000-2002 by Florian Klaempfl
This unit implements some basic nodes
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 nbas;
{$i fpcdefs.inc}
interface
uses
globtype,
cpuinfo,cpubase,cgbase,cgutils,
aasmbase,aasmtai,aasmdata,aasmcpu,
node,
symtype;
type
tnothingnode = class(tnode)
constructor create;virtual;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
end;
tnothingnodeclass = class of tnothingnode;
terrornode = class(tnode)
constructor create;virtual;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
procedure mark_write;override;
end;
terrornodeclass = class of terrornode;
tasmnode = class(tnode)
p_asm : TAsmList;
currenttai : tai;
{ Used registers in assembler block }
used_regs_int,
used_regs_fpu : tcpuregisterset;
constructor create(p : TAsmList);virtual;
constructor create_get_position;
destructor destroy;override;
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure buildderefimpl;override;
procedure derefimpl;override;
function dogetcopy : tnode;override;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
function docompare(p: tnode): boolean; override;
end;
tasmnodeclass = class of tasmnode;
tstatementnode = class(tbinarynode)
constructor create(l,r : tnode);virtual;
function simplify(forinline : boolean) : tnode; override;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
procedure printnodetree(var t:text);override;
property statement : tnode read left write left;
property next : tnode read right write right;
end;
tstatementnodeclass = class of tstatementnode;
tblocknode = class(tunarynode)
constructor create(l : tnode);virtual;
destructor destroy; override;
function simplify(forinline : boolean) : tnode; override;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
{$ifdef state_tracking}
function track_state_pass(exec_known:boolean):boolean;override;
{$endif state_tracking}
property statements : tnode read left write left;
end;
tblocknodeclass = class of tblocknode;
ttempcreatenode = class;
ttempinfoflag = (ti_may_be_in_reg,ti_valid,ti_nextref_set_hookoncopy_nil,
ti_addr_taken,ti_executeinitialisation);
ttempinfoflags = set of ttempinfoflag;
const
tempinfostoreflags = [ti_may_be_in_reg,ti_addr_taken];
type
{ to allow access to the location by temp references even after the temp has }
{ already been disposed and to make sure the coherency between temps and }
{ temp references is kept after a getcopy }
ptempinfo = ^ttempinfo;
ttempinfo = record
{ set to the copy of a tempcreate pnode (if it gets copied) so that the }
{ refs and deletenode can hook to this copy once they get copied too }
hookoncopy : ptempinfo;
typedef : tdef;
typedefderef : tderef;
temptype : ttemptype;
owner : ttempcreatenode;
withnode : tnode;
location : tlocation;
flags : ttempinfoflags;
tempinitcode : tnode;
end;
{ a node which will create a (non)persistent temp of a given type with a given }
{ size (the size is separate to allow creating "void" temps with a custom size) }
ttempcreatenode = class(tnode)
size: tcgint;
tempinfo: ptempinfo;
ftemplvalue : tnode;
{ * persistent temps are used in manually written code where the temp }
{ be usable among different statements and where you can manually say }
{ when the temp has to be freed (using a ttempdeletenode) }
{ * non-persistent temps are mostly used in typeconversion helpers, }
{ where the node that receives the temp becomes responsible for }
{ freeing it. In this last case, you must use only one reference }
{ to it and *not* generate a ttempdeletenode }
constructor create(_typedef: tdef; _size: tcgint; _temptype: ttemptype;allowreg:boolean); virtual;
constructor create_withnode(_typedef: tdef; _size: tcgint; _temptype: ttemptype; allowreg:boolean; withnode: tnode); virtual;
constructor create_value(_typedef:tdef; _size: tcgint; _temptype: ttemptype;allowreg:boolean; templvalue: tnode);
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure buildderefimpl;override;
procedure derefimpl;override;
function dogetcopy: tnode; override;
function pass_1 : tnode; override;
function pass_typecheck: tnode; override;
function docompare(p: tnode): boolean; override;
procedure printnodedata(var t:text);override;
end;
ttempcreatenodeclass = class of ttempcreatenode;
{ a node which is a reference to a certain temp }
ttemprefnode = class(tnode)
tempinfo: ptempinfo;
constructor create(const temp: ttempcreatenode); virtual;
constructor create_offset(const temp: ttempcreatenode;aoffset:longint);
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure resolveppuidx;override;
function dogetcopy: tnode; override;
function pass_1 : tnode; override;
function pass_typecheck : tnode; override;
procedure mark_write;override;
function docompare(p: tnode): boolean; override;
procedure printnodedata(var t:text);override;
protected
offset : longint;
private
tempidx : longint;
end;
ttemprefnodeclass = class of ttemprefnode;
{ a node which removes a temp }
ttempdeletenode = class(tnode)
tempinfo: ptempinfo;
constructor create(const temp: ttempcreatenode); virtual;
{ this will convert the persistant temp to a normal temp
for returning to the other nodes }
constructor create_normal_temp(const temp: ttempcreatenode);
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure resolveppuidx;override;
function dogetcopy: tnode; override;
function pass_1: tnode; override;
function pass_typecheck: tnode; override;
function docompare(p: tnode): boolean; override;
destructor destroy; override;
procedure printnodedata(var t:text);override;
protected
release_to_normal : boolean;
private
tempidx : longint;
end;
ttempdeletenodeclass = class of ttempdeletenode;
var
cnothingnode : tnothingnodeclass = tnothingnode;
cerrornode : terrornodeclass = terrornode;
casmnode : tasmnodeclass = tasmnode;
cstatementnode : tstatementnodeclass = tstatementnode;
cblocknode : tblocknodeclass = tblocknode;
ctempcreatenode : ttempcreatenodeclass = ttempcreatenode;
ctemprefnode : ttemprefnodeclass = ttemprefnode;
ctempdeletenode : ttempdeletenodeclass = ttempdeletenode;
{ Create a blocknode and statement node for multiple statements
generated internally by the parser }
function internalstatements(var laststatement:tstatementnode):tblocknode;
function laststatement(block:tblocknode):tstatementnode;
procedure addstatement(var laststatement:tstatementnode;n:tnode);
implementation
uses
cutils,
verbose,globals,systems,
symconst,symdef,defutil,defcmp,
pass_1,
nutils,nld,ncal,nflw,
procinfo
;
{*****************************************************************************
Helpers
*****************************************************************************}
function internalstatements(var laststatement:tstatementnode):tblocknode;
begin
{ create dummy initial statement }
laststatement := cstatementnode.create(cnothingnode.create,nil);
internalstatements := cblocknode.create(laststatement);
end;
function laststatement(block:tblocknode):tstatementnode;
begin
result:=tstatementnode(block.left);
while assigned(result) and assigned(result.right) do
result:=tstatementnode(result.right);
end;
procedure addstatement(var laststatement:tstatementnode;n:tnode);
begin
if assigned(laststatement.right) then
internalerror(200204201);
laststatement.right:=cstatementnode.create(n,nil);
laststatement:=tstatementnode(laststatement.right);
end;
{*****************************************************************************
TFIRSTNOTHING
*****************************************************************************}
constructor tnothingnode.create;
begin
inherited create(nothingn);
end;
function tnothingnode.pass_typecheck:tnode;
begin
result:=nil;
resultdef:=voidtype;
end;
function tnothingnode.pass_1 : tnode;
begin
result:=nil;
expectloc:=LOC_VOID;
end;
{*****************************************************************************
TFIRSTERROR
*****************************************************************************}
constructor terrornode.create;
begin
inherited create(errorn);
end;
function terrornode.pass_typecheck:tnode;
begin
result:=nil;
include(flags,nf_error);
codegenerror:=true;
resultdef:=generrordef;
end;
function terrornode.pass_1 : tnode;
begin
result:=nil;
expectloc:=LOC_VOID;
codegenerror:=true;
end;
procedure terrornode.mark_write;
begin
end;
{*****************************************************************************
TSTATEMENTNODE
*****************************************************************************}
constructor tstatementnode.create(l,r : tnode);
begin
inherited create(statementn,l,r);
end;
function is_exit_statement(var n: tnode; arg: pointer): foreachnoderesult;
begin
if (n.nodetype<>exitn) then
result:=fen_false
else
result:=fen_norecurse_true;
end;
function no_exit_statement_in_block(n: tnode): boolean;
begin
result:=not foreachnodestatic(n,@is_exit_statement,nil);
end;
function tstatementnode.simplify(forinline: boolean) : tnode;
begin
result:=nil;
{ these "optimizations" are only to make it more easy to recognise }
{ blocknodes which at the end of inlining only contain one single }
{ statement. Simplifying inside blocknode.simplify could be dangerous }
{ because if the main blocknode which makes up a procedure/function }
{ body were replaced with a statementn/nothingn, this could cause }
{ problems elsewhere in the compiler which expects a blocknode }
{ remove next statement if it's a nothing-statement (since if it's }
{ the last, it won't remove itself -- see next simplification) }
while assigned(right) and
(tstatementnode(right).left.nodetype = nothingn) do
begin
result:=tstatementnode(right).right;
tstatementnode(right).right:=nil;
right.free;
right:=result;
result:=nil;
end;
{ Remove initial nothingn if there are other statements. If there }
{ are no other statements, returning nil doesn't help (will be }
{ interpreted as "can't be simplified") and replacing the }
{ statementnode with a nothingnode cannot be done (because it's }
{ possible this statementnode is a child of a blocknode, and }
{ blocknodes are expected to only contain statementnodes) }
if (left.nodetype = nothingn) and
assigned(right) then
begin
result:=right;
right:=nil;
exit;
end;
{ if the current statement contains a block with one statement, }
{ replace the current statement with that block's statement }
{ (but only if the block does not have nf_block_with_exit set }
{ or has no exit statement, because otherwise it needs an own }
{ exit label, see tests/test/tinline10) }
if (left.nodetype = blockn) and
(not(nf_block_with_exit in left.flags) or
no_exit_statement_in_block(left)) and
assigned(tblocknode(left).left) and
not assigned(tstatementnode(tblocknode(left).left).right) then
begin
result:=tblocknode(left).left;
tstatementnode(result).right:=right;
right:=nil;
tblocknode(left).left:=nil;
exit;
end;
end;
function tstatementnode.pass_typecheck:tnode;
begin
result:=nil;
resultdef:=voidtype;
{ left is the statement itself calln assignn or a complex one }
typecheckpass(left);
if codegenerror then
exit;
{ right is the next statement in the list }
if assigned(right) then
typecheckpass(right);
if codegenerror then
exit;
end;
function tstatementnode.pass_1 : tnode;
begin
result:=nil;
{ left is the statement itself calln assignn or a complex one }
firstpass(left);
if codegenerror then
exit;
expectloc:=left.expectloc;
{ right is the next in the list }
if assigned(right) then
firstpass(right);
if codegenerror then
exit;
end;
procedure tstatementnode.printnodetree(var t:text);
begin
printnodelist(t);
end;
{*****************************************************************************
TBLOCKNODE
*****************************************************************************}
constructor tblocknode.create(l : tnode);
begin
inherited create(blockn,l);
end;
destructor tblocknode.destroy;
var
hp, next: tstatementnode;
begin
hp := tstatementnode(left);
left := nil;
while assigned(hp) do
begin
next := tstatementnode(hp.right);
hp.right := nil;
hp.free;
hp := next;
end;
inherited destroy;
end;
function tblocknode.simplify(forinline : boolean): tnode;
begin
result := nil;
{ Warning: never replace a blocknode with another node type, }
{ since the block may be the main block of a procedure/function/ }
{ main program body, and those nodes should always be blocknodes }
{ since that's what the compiler expects elsewhere. }
{ if the current block contains only one statement, and }
{ this one statement only contains another block, replace }
{ this block with that other block. }
if assigned(left) and
not assigned(tstatementnode(left).right) and
(tstatementnode(left).left.nodetype = blockn) then
begin
result:=tstatementnode(left).left;
tstatementnode(left).left:=nil;
{ make sure the nf_block_with_exit flag is safeguarded }
result.flags:=result.flags+(flags * [nf_block_with_exit]);
exit;
end;
end;
function tblocknode.pass_typecheck:tnode;
var
hp : tstatementnode;
begin
result:=nil;
resultdef:=voidtype;
hp:=tstatementnode(left);
while assigned(hp) do
begin
if assigned(hp.left) then
begin
codegenerror:=false;
typecheckpass(hp.left);
{ the resultdef of the block is the last type that is
returned. Normally this is a voidtype. But when the
compiler inserts a block of multiple statements then the
last entry can return a value }
resultdef:=hp.left.resultdef;
end;
hp:=tstatementnode(hp.right);
end;
end;
function tblocknode.pass_1 : tnode;
var
hp : tstatementnode;
//count : longint;
begin
result:=nil;
expectloc:=LOC_VOID;
//count:=0;
hp:=tstatementnode(left);
while assigned(hp) do
begin
if assigned(hp.left) then
begin
codegenerror:=false;
firstpass(hp.left);
hp.expectloc:=hp.left.expectloc;
end;
expectloc:=hp.expectloc;
//inc(count);
hp:=tstatementnode(hp.right);
end;
end;
{$ifdef state_tracking}
function Tblocknode.track_state_pass(exec_known:boolean):boolean;
var hp:Tstatementnode;
begin
track_state_pass:=false;
hp:=Tstatementnode(left);
while assigned(hp) do
begin
if hp.left.track_state_pass(exec_known) then
track_state_pass:=true;
hp:=Tstatementnode(hp.right);
end;
end;
{$endif state_tracking}
{*****************************************************************************
TASMNODE
*****************************************************************************}
constructor tasmnode.create(p : TAsmList);
begin
inherited create(asmn);
p_asm:=p;
currenttai:=nil;
used_regs_int:=[];
used_regs_fpu:=[];
end;
constructor tasmnode.create_get_position;
begin
inherited create(asmn);
p_asm:=nil;
include(flags,nf_get_asm_position);
currenttai:=nil;
end;
destructor tasmnode.destroy;
begin
if assigned(p_asm) then
p_asm.free;
inherited destroy;
end;
constructor tasmnode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
var
hp : tai;
begin
inherited ppuload(t,ppufile);
if not(nf_get_asm_position in flags) then
begin
p_asm:=TAsmList.create;
repeat
hp:=ppuloadai(ppufile);
if hp=nil then
break;
p_asm.concat(hp);
until false;
end
else
p_asm:=nil;
currenttai:=nil;
end;
procedure tasmnode.ppuwrite(ppufile:tcompilerppufile);
var
hp : tai;
begin
inherited ppuwrite(ppufile);
{ TODO: FIXME Add saving of register sets}
if not(nf_get_asm_position in flags) then
begin
hp:=tai(p_asm.first);
while assigned(hp) do
begin
ppuwriteai(ppufile,hp);
hp:=tai(hp.next);
end;
{ end is marked by a nil }
ppuwriteai(ppufile,nil);
end;
end;
procedure tasmnode.buildderefimpl;
var
hp : tai;
begin
inherited buildderefimpl;
if not(nf_get_asm_position in flags) then
begin
hp:=tai(p_asm.first);
while assigned(hp) do
begin
hp.buildderefimpl;
hp:=tai(hp.next);
end;
end;
end;
procedure tasmnode.derefimpl;
var
hp : tai;
begin
inherited derefimpl;
if not(nf_get_asm_position in flags) then
begin
hp:=tai(p_asm.first);
while assigned(hp) do
begin
hp.derefimpl;
hp:=tai(hp.next);
end;
end;
end;
function tasmnode.dogetcopy: tnode;
var
n: tasmnode;
begin
n := tasmnode(inherited dogetcopy);
if assigned(p_asm) then
begin
n.p_asm:=TAsmList.create;
n.p_asm.concatlistcopy(p_asm);
end
else n.p_asm := nil;
n.currenttai:=currenttai;
result:=n;
end;
function tasmnode.pass_typecheck:tnode;
begin
result:=nil;
resultdef:=voidtype;
if not(nf_get_asm_position in flags) then
include(current_procinfo.flags,pi_has_assembler_block);
end;
function tasmnode.pass_1 : tnode;
begin
result:=nil;
expectloc:=LOC_VOID;
end;
function tasmnode.docompare(p: tnode): boolean;
begin
{ comparing of asmlists is not implemented (JM) }
docompare := false;
end;
{*****************************************************************************
TEMPCREATENODE
*****************************************************************************}
constructor ttempcreatenode.create(_typedef:tdef; _size: tcgint; _temptype: ttemptype;allowreg:boolean);
begin
inherited create(tempcreaten);
size := _size;
new(tempinfo);
fillchar(tempinfo^,sizeof(tempinfo^),0);
tempinfo^.typedef := _typedef;
tempinfo^.temptype := _temptype;
tempinfo^.owner := self;
tempinfo^.withnode := nil;
if allowreg and
{ temp must fit a single register }
(tstoreddef(_typedef).is_fpuregable or
(tstoreddef(_typedef).is_intregable and
(_size<=TCGSize2Size[OS_64]))) and
{ size of register operations must be known }
(def_cgsize(_typedef)<>OS_NO) and
{ no init/final needed }
not is_managed_type(_typedef) then
include(tempinfo^.flags,ti_may_be_in_reg);
end;
constructor ttempcreatenode.create_withnode(_typedef: tdef; _size: tcgint; _temptype: ttemptype; allowreg:boolean; withnode: tnode);
begin
self.create(_typedef,_size,_temptype,allowreg);
tempinfo^.withnode:=withnode.getcopy;
end;
constructor ttempcreatenode.create_value(_typedef:tdef; _size: tcgint; _temptype: ttemptype;allowreg:boolean; templvalue: tnode);
begin
self.create(_typedef,_size,_temptype,allowreg);
// store in ppuwrite
ftemplvalue:=templvalue;
// create from stored ftemplvalue in ppuload
tempinfo^.tempinitcode:=cassignmentnode.create(ctemprefnode.create(self),ftemplvalue);
end;
function ttempcreatenode.dogetcopy: tnode;
var
n: ttempcreatenode;
begin
n := ttempcreatenode(inherited dogetcopy);
n.size := size;
new(n.tempinfo);
fillchar(n.tempinfo^,sizeof(n.tempinfo^),0);
n.tempinfo^.owner:=n;
n.tempinfo^.typedef := tempinfo^.typedef;
n.tempinfo^.temptype := tempinfo^.temptype;
n.tempinfo^.flags := tempinfo^.flags * tempinfostoreflags;
{ when the tempinfo has already a hookoncopy then it is not
reset by a tempdeletenode }
if assigned(tempinfo^.hookoncopy) then
internalerror(200211262);
{ signal the temprefs that the temp they point to has been copied, }
{ so that if the refs get copied as well, they can hook themselves }
{ to the copy of the temp }
tempinfo^.hookoncopy := n.tempinfo;
exclude(tempinfo^.flags,ti_nextref_set_hookoncopy_nil);
if assigned(tempinfo^.withnode) then
n.tempinfo^.withnode := tempinfo^.withnode.getcopy
else
n.tempinfo^.withnode := nil;
if assigned(tempinfo^.tempinitcode) then
n.tempinfo^.tempinitcode := tempinfo^.tempinitcode.getcopy
else
n.tempinfo^.tempinitcode := nil;
result := n;
end;
constructor ttempcreatenode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
size:=ppufile.getlongint;
new(tempinfo);
fillchar(tempinfo^,sizeof(tempinfo^),0);
ppufile.getsmallset(tempinfo^.flags);
ppufile.getderef(tempinfo^.typedefderef);
tempinfo^.temptype := ttemptype(ppufile.getbyte);
tempinfo^.owner:=self;
tempinfo^.withnode:=ppuloadnode(ppufile);
ftemplvalue:=ppuloadnode(ppufile);
end;
procedure ttempcreatenode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putlongint(size);
ppufile.putsmallset(tempinfo^.flags);
ppufile.putderef(tempinfo^.typedefderef);
ppufile.putbyte(byte(tempinfo^.temptype));
ppuwritenode(ppufile,tempinfo^.withnode);
ppuwritenode(ppufile,ftemplvalue);
end;
procedure ttempcreatenode.buildderefimpl;
begin
inherited buildderefimpl;
tempinfo^.typedefderef.build(tempinfo^.typedef);
if assigned(tempinfo^.withnode) then
tempinfo^.withnode.buildderefimpl;
if assigned(ftemplvalue) then
ftemplvalue.buildderefimpl;
end;
procedure ttempcreatenode.derefimpl;
begin
inherited derefimpl;
tempinfo^.typedef:=tdef(tempinfo^.typedefderef.resolve);
if assigned(tempinfo^.withnode) then
tempinfo^.withnode.derefimpl;
if assigned(ftemplvalue) then
begin
ftemplvalue.derefimpl;
tempinfo^.tempinitcode:=cassignmentnode.create(ctemprefnode.create(self),ftemplvalue);
end;
end;
function ttempcreatenode.pass_1 : tnode;
begin
result := nil;
expectloc:=LOC_VOID;
if (tempinfo^.typedef.needs_inittable) then
include(current_procinfo.flags,pi_needs_implicit_finally);
if assigned(tempinfo^.withnode) then
firstpass(tempinfo^.withnode);
if assigned(tempinfo^.tempinitcode) then
firstpass(tempinfo^.tempinitcode);
end;
function ttempcreatenode.pass_typecheck: tnode;
begin
result := nil;
{ a tempcreatenode doesn't have a resultdef, only temprefnodes do }
resultdef := voidtype;
if assigned(tempinfo^.withnode) then
typecheckpass(tempinfo^.withnode);
if assigned(tempinfo^.tempinitcode) then
typecheckpass(tempinfo^.tempinitcode);
end;
function ttempcreatenode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttempcreatenode(p).size = size) and
(ttempcreatenode(p).tempinfo^.flags*tempinfostoreflags=tempinfo^.flags*tempinfostoreflags) and
equal_defs(ttempcreatenode(p).tempinfo^.typedef,tempinfo^.typedef) and
(ttempcreatenode(p).tempinfo^.withnode.isequal(tempinfo^.withnode)) and
(ttempcreatenode(p).tempinfo^.tempinitcode.isequal(tempinfo^.tempinitcode));
end;
procedure ttempcreatenode.printnodedata(var t:text);
begin
inherited printnodedata(t);
writeln(t,printnodeindention,'size = ',size,', temptypedef = ',tempinfo^.typedef.typesymbolprettyname,' = "',
tempinfo^.typedef.GetTypeName,'", tempinfo = $',hexstr(ptrint(tempinfo),sizeof(ptrint)*2));
end;
{*****************************************************************************
TEMPREFNODE
*****************************************************************************}
constructor ttemprefnode.create(const temp: ttempcreatenode);
begin
inherited create(temprefn);
tempinfo := temp.tempinfo;
offset:=0;
end;
constructor ttemprefnode.create_offset(const temp: ttempcreatenode;aoffset:longint);
begin
self.create(temp);
offset := aoffset;
end;
function ttemprefnode.dogetcopy: tnode;
var
n: ttemprefnode;
begin
n := ttemprefnode(inherited dogetcopy);
n.offset := offset;
if assigned(tempinfo^.hookoncopy) then
{ if the temp has been copied, assume it becomes a new }
{ temp which has to be hooked by the copied reference }
begin
{ hook the ref to the copied temp }
n.tempinfo := tempinfo^.hookoncopy;
{ if we passed a ttempdeletenode that changed the temp }
{ from a persistent one into a normal one, we must be }
{ the last reference (since our parent should free the }
{ temp (JM) }
if (ti_nextref_set_hookoncopy_nil in tempinfo^.flags) then
tempinfo^.hookoncopy := nil;
end
else
{ if the temp we refer to hasn't been copied, assume }
{ we're just a new reference to that temp }
begin
n.tempinfo := tempinfo;
end;
if not assigned(n.tempinfo) then
internalerror(2005071901);
result := n;
end;
constructor ttemprefnode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
tempidx:=ppufile.getlongint;
offset:=ppufile.getlongint;
end;
procedure ttemprefnode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putlongint(tempinfo^.owner.ppuidx);
ppufile.putlongint(offset);
end;
procedure ttemprefnode.resolveppuidx;
var
temp : ttempcreatenode;
begin
temp:=ttempcreatenode(nodeppuidxget(tempidx));
if temp.nodetype<>tempcreaten then
internalerror(200311075);
tempinfo:=temp.tempinfo;
end;
function ttemprefnode.pass_1 : tnode;
begin
expectloc := LOC_REFERENCE;
if not tempinfo^.typedef.needs_inittable and
(ti_may_be_in_reg in tempinfo^.flags) then
begin
if tempinfo^.typedef.typ=floatdef then
begin
if not use_vectorfpu(tempinfo^.typedef) then
if (tempinfo^.temptype = tt_persistent) then
expectloc := LOC_CFPUREGISTER
else
expectloc := LOC_FPUREGISTER
else
if (tempinfo^.temptype = tt_persistent) then
expectloc := LOC_CMMREGISTER
else
expectloc := LOC_MMREGISTER
end
else
begin
if (tempinfo^.temptype = tt_persistent) then
expectloc := LOC_CREGISTER
else
expectloc := LOC_REGISTER;
end;
end;
result := nil;
end;
function ttemprefnode.pass_typecheck: tnode;
begin
{ check if the temp is already resultdef passed }
if not assigned(tempinfo^.typedef) then
internalerror(200108233);
result := nil;
resultdef := tempinfo^.typedef;
end;
function ttemprefnode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttemprefnode(p).tempinfo = tempinfo) and
(ttemprefnode(p).offset = offset);
end;
procedure ttemprefnode.mark_write;
begin
include(flags,nf_write);
end;
procedure ttemprefnode.printnodedata(var t:text);
begin
inherited printnodedata(t);
writeln(t,printnodeindention,'temptypedef = ',tempinfo^.typedef.typesymbolprettyname,' = "',
tempinfo^.typedef.GetTypeName,'", tempinfo = $',hexstr(ptrint(tempinfo),sizeof(ptrint)*2));
end;
{*****************************************************************************
TEMPDELETENODE
*****************************************************************************}
constructor ttempdeletenode.create(const temp: ttempcreatenode);
begin
inherited create(tempdeleten);
tempinfo := temp.tempinfo;
release_to_normal := false;
end;
constructor ttempdeletenode.create_normal_temp(const temp: ttempcreatenode);
begin
inherited create(tempdeleten);
tempinfo := temp.tempinfo;
release_to_normal := true;
if tempinfo^.temptype <> tt_persistent then
internalerror(200204211);
end;
function ttempdeletenode.dogetcopy: tnode;
var
n: ttempdeletenode;
begin
n:=ttempdeletenode(inherited dogetcopy);
n.release_to_normal:=release_to_normal;
if assigned(tempinfo^.hookoncopy) then
{ if the temp has been copied, assume it becomes a new }
{ temp which has to be hooked by the copied deletenode }
begin
{ hook the tempdeletenode to the copied temp }
n.tempinfo:=tempinfo^.hookoncopy;
{ the temp shall not be used, reset hookoncopy }
{ Only if release_to_normal is false, otherwise }
{ the temp can still be referenced once more (JM) }
if (not release_to_normal) then
tempinfo^.hookoncopy:=nil
else
include(tempinfo^.flags,ti_nextref_set_hookoncopy_nil);
end
else
{ if the temp we refer to hasn't been copied, we have a }
{ problem since that means we now have two delete nodes }
{ for one temp }
internalerror(200108234);
result:=n;
end;
constructor ttempdeletenode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
tempidx:=ppufile.getlongint;
release_to_normal:=(ppufile.getbyte<>0);
end;
procedure ttempdeletenode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putlongint(tempinfo^.owner.ppuidx);
ppufile.putbyte(byte(release_to_normal));
end;
procedure ttempdeletenode.resolveppuidx;
var
temp : ttempcreatenode;
begin
temp:=ttempcreatenode(nodeppuidxget(tempidx));
if temp.nodetype<>tempcreaten then
internalerror(200311075);
tempinfo:=temp.tempinfo;
end;
function ttempdeletenode.pass_1 : tnode;
begin
expectloc:=LOC_VOID;
result := nil;
end;
function ttempdeletenode.pass_typecheck: tnode;
begin
result := nil;
resultdef := voidtype;
end;
function ttempdeletenode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttemprefnode(p).tempinfo = tempinfo);
end;
destructor ttempdeletenode.destroy;
begin
if assigned(tempinfo^.withnode) then
begin
tempinfo^.withnode.free;
end;
dispose(tempinfo);
end;
procedure ttempdeletenode.printnodedata(var t:text);
begin
inherited printnodedata(t);
writeln(t,printnodeindention,'release_to_normal: ',release_to_normal,', temptypedef = ',tempinfo^.typedef.typesymbolprettyname,' = "',
tempinfo^.typedef.GetTypeName,'", tempinfo = $',hexstr(ptrint(tempinfo),sizeof(ptrint)*2));
end;
end.
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