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fpc/compiler/cgbase.pas
florian bf32e2d2cf + tcg.direction is used now
2002-09-07 19:34:08 +00:00

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
This unit exports some help routines for the code generation
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.
****************************************************************************
}
{# Some helpers for the code generator.
}
unit cgbase;
{$i fpcdefs.inc}
interface
uses
{ common }
cclasses,
{ global }
globals,verbose,
{ symtable }
symconst,symtype,symdef,symsym,
{ aasm }
cpubase,cpuinfo,cginfo,aasmbase,aasmtai
;
const
{# bitmask indicating if the procedure uses asm }
pi_uses_asm = $1;
{# bitmask indicating if the procedure is exported by an unit }
pi_is_global = $2;
{# bitmask indicating if the procedure does a call }
pi_do_call = $4;
{# bitmask indicating if the procedure is an operator }
pi_operator = $8;
{# bitmask indicating if the procedure is an external C function }
pi_c_import = $10;
{# bitmask indicating if the procedure has a try statement = no register optimization }
pi_uses_exceptions = $20;
{# bitmask indicating if the procedure is declared as @var(assembler), don't optimize}
pi_is_assembler = $40;
{# bitmask indicating if the procedure contains data which needs to be finalized }
pi_needs_implicit_finally = $80;
type
{# This object gives information on the current routine being
compiled.
}
tprocinfo = class
{ pointer to parent in nested procedures }
parent : tprocinfo;
{# current class, if we are in a method }
_class : tobjectdef;
{# the definition of the routine itself }
procdef : tprocdef;
{# offset from frame pointer to get parent frame pointer reference
(used in nested routines only)
}
framepointer_offset : longint;
{# offset from frame pointer to get self reference }
selfpointer_offset : longint;
{# result value offset in stack (functions only) }
return_offset : longint;
{# firsttemp position }
firsttemp_offset : longint;
{# offset from frame pointer to parameters }
para_offset : longint;
{# some collected informations about the procedure
see pi_xxxx constants above
}
flags : longint;
{# register used as frame pointer }
framepointer : tregister;
{# true, if the procedure is exported by a unit }
globalsymbol : boolean;
{# true, if the procedure should be exported (only OS/2) }
exported : boolean;
{# true, if we can not use fast exit code }
no_fast_exit : boolean;
{# Holds the environment reference for default exceptions
The exception reference is created when ansistrings
or classes are used. It holds buffer for exception
frames. It is allocted by g_new_exception.
}
exception_env_ref : treference;
{# Holds the environment reference for default exceptions
The exception reference is created when ansistrings
or classes are used. It holds buffer for setjmp
It is allocted by g_new_exception.
}
exception_jmp_ref :treference;
{# Holds the environment reference for default exceptions
The exception reference is created when ansistrings
or classes are used. It holds the location where
temporary storage of the setjmp result is stored.
This reference can be unused, if the result is instead
saved on the stack.
}
exception_result_ref :treference;
{# Holds the reference used to store alll saved registers.
This is used on systems which do not have direct stack
operations (such as the PowerPC), it is unused on other
systems
}
save_regs_ref : treference;
{# The code for the routine itself, excluding entry and
exit code. This is a linked list of tai classes.
}
aktproccode : taasmoutput;
{# The code for the routine entry code.
}
aktentrycode: taasmoutput;
{# The code for the routine exit code.
}
aktexitcode: taasmoutput;
aktlocaldata : taasmoutput;
constructor create;virtual;
destructor destroy;override;
procedure allocate_interrupt_stackframe;virtual;
{ Updates usedinproc depending on the resulttype }
procedure update_usedinproc_result;virtual;
{ Does the necessary stuff before a procedure body is compiled }
procedure handle_body_start;virtual;
{ This is called by parser, after the header of a subroutine is parsed.
If the local symtable offset depends on the para symtable size, the
necessary stuff must be done here.
}
procedure after_header;virtual;
{ This procedure is called after the pass 1 of the subroutine body is done.
Here the address fix ups to generate code for the body must be done.
}
procedure after_pass1;virtual;
{ sets the offset for a temp used by the result }
procedure set_result_offset;virtual;
end;
pregvarinfo = ^tregvarinfo;
tregvarinfo = record
regvars : array[1..maxvarregs] of tvarsym;
regvars_para : array[1..maxvarregs] of boolean;
regvars_refs : array[1..maxvarregs] of longint;
fpuregvars : array[1..maxfpuvarregs] of tvarsym;
fpuregvars_para : array[1..maxfpuvarregs] of boolean;
fpuregvars_refs : array[1..maxfpuvarregs] of longint;
end;
var
{# information about the current sub routine being parsed (@var(pprocinfo))}
procinfo : tprocinfo;
cprocinfo : class of tprocinfo;
{ labels for BREAK and CONTINUE }
aktbreaklabel,aktcontinuelabel : tasmlabel;
{ label when the result is true or false }
truelabel,falselabel : tasmlabel;
{ label to leave the sub routine }
aktexitlabel : tasmlabel;
{ also an exit label, only used we need to clear only the stack }
aktexit2label : tasmlabel;
{# only used in constructor for fail keyword or if getmem fails }
faillabel : tasmlabel;
quickexitlabel : tasmlabel;
{# true, if there was an error while code generation occurs }
codegenerror : boolean;
{ save the size of pushed parameter, needed for aligning }
pushedparasize : longint;
{ message calls with codegenerror support }
procedure cgmessage(t : longint);
procedure cgmessage1(t : longint;const s : string);
procedure cgmessage2(t : longint;const s1,s2 : string);
procedure cgmessage3(t : longint;const s1,s2,s3 : string);
procedure CGMessagePos(const pos:tfileposinfo;t:longint);
procedure CGMessagePos1(const pos:tfileposinfo;t:longint;const s1:string);
procedure CGMessagePos2(const pos:tfileposinfo;t:longint;const s1,s2:string);
procedure CGMessagePos3(const pos:tfileposinfo;t:longint;const s1,s2,s3:string);
{ initialize respectively terminates the code generator }
{ for a new module or procedure }
procedure codegen_doneprocedure;
procedure codegen_donemodule;
procedure codegen_newmodule;
procedure codegen_newprocedure;
{# From a definition return the abstract code generator size enum. It is
to note that the value returned can be @var(OS_NO) }
function def_cgsize(def: tdef): tcgsize;
{# From a constant numeric value, return the abstract code generator
size.
}
function int_cgsize(const l: aword): tcgsize;
{# return the inverse condition of opcmp }
function inverse_opcmp(opcmp: topcmp): topcmp;
{# return whether op is commutative }
function commutativeop(op: topcg): boolean;
implementation
uses
systems,
cresstr,
tgobj,rgobj,
defbase,
fmodule
{$ifdef fixLeaksOnError}
,comphook
{$endif fixLeaksOnError}
,symbase,paramgr
;
{$ifdef fixLeaksOnError}
var procinfoStack: TStack;
hcodegen_old_do_stop: tstopprocedure;
{$endif fixLeaksOnError}
{*****************************************************************************
override the message calls to set codegenerror
*****************************************************************************}
procedure cgmessage(t : longint);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.Message(t);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessage1(t : longint;const s : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.Message1(t,s);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessage2(t : longint;const s1,s2 : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.Message2(t,s1,s2);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessage3(t : longint;const s1,s2,s3 : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.Message3(t,s1,s2,s3);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessagepos(const pos:tfileposinfo;t : longint);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.MessagePos(pos,t);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessagepos1(const pos:tfileposinfo;t : longint;const s1 : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.MessagePos1(pos,t,s1);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessagepos2(const pos:tfileposinfo;t : longint;const s1,s2 : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.MessagePos2(pos,t,s1,s2);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
procedure cgmessagepos3(const pos:tfileposinfo;t : longint;const s1,s2,s3 : string);
var
olderrorcount : longint;
begin
if not(codegenerror) then
begin
olderrorcount:=Errorcount;
verbose.MessagePos3(pos,t,s1,s2,s3);
codegenerror:=olderrorcount<>Errorcount;
end;
end;
{****************************************************************************
TProcInfo
****************************************************************************}
constructor tprocinfo.create;
begin
parent:=nil;
_class:=nil;
procdef:=nil;
framepointer_offset:=0;
selfpointer_offset:=0;
return_offset:=0;
firsttemp_offset:=0;
para_offset:=0;
flags:=0;
framepointer:=R_NO;
globalsymbol:=false;
exported:=false;
no_fast_exit:=false;
aktentrycode:=Taasmoutput.Create;
aktexitcode:=Taasmoutput.Create;
aktproccode:=Taasmoutput.Create;
aktlocaldata:=Taasmoutput.Create;
reference_reset(exception_env_ref);
reference_reset(exception_jmp_ref);
reference_reset(exception_result_ref);
end;
destructor tprocinfo.destroy;
begin
aktentrycode.free;
aktexitcode.free;
aktproccode.free;
aktlocaldata.free;
end;
procedure tprocinfo.allocate_interrupt_stackframe;
begin
end;
procedure tprocinfo.handle_body_start;
begin
{ temporary space is set, while the BEGIN of the procedure }
if (symtablestack.symtabletype=localsymtable) then
procinfo.firsttemp_offset := tg.direction*symtablestack.datasize
else
procinfo.firsttemp_offset := 0;
{ space for the return value }
{ !!!!! this means that we can not set the return value
in a subfunction !!!!! }
{ because we don't know yet where the address is }
if not is_void(aktprocdef.rettype.def) then
begin
if paramanager.ret_in_reg(aktprocdef.rettype.def) then
begin
{ the space has been set in the local symtable }
procinfo.return_offset:=tg.direction*tfuncretsym(aktprocdef.funcretsym).address;
if ((procinfo.flags and pi_operator)<>0) and
assigned(otsym) then
otsym.address:=tfuncretsym(aktprocdef.funcretsym).address;
rg.usedinproc := rg.usedinproc +
getfuncretusedregisters(aktprocdef.rettype.def);
end;
end;
end;
{ updates usedinproc depending on the resulttype }
procedure tprocinfo.update_usedinproc_result;
begin
if paramanager.ret_in_reg(procdef.rettype.def) then
begin
rg.usedinproc := rg.usedinproc +
getfuncretusedregisters(procdef.rettype.def);
end;
end;
procedure tprocinfo.set_result_offset;
begin
if paramanager.ret_in_reg(aktprocdef) then
procinfo.return_offset:=-tfuncretsym(procdef.funcretsym).address;
end;
procedure tprocinfo.after_header;
begin
end;
procedure tprocinfo.after_pass1;
begin
end;
{*****************************************************************************
initialize/terminate the codegen for procedure and modules
*****************************************************************************}
procedure codegen_newprocedure;
begin
aktbreaklabel:=nil;
aktcontinuelabel:=nil;
{ aktexitlabel:=0; is store in oldaktexitlabel
so it must not be reset to zero before this storage !}
{ new procinfo }
procinfo:=cprocinfo.create;
{$ifdef fixLeaksOnError}
procinfoStack.push(procinfo);
{$endif fixLeaksOnError}
end;
procedure codegen_doneprocedure;
begin
{$ifdef fixLeaksOnError}
if procinfo <> procinfoStack.pop then
writeln('problem with procinfoStack!');
{$endif fixLeaksOnError}
procinfo.free;
procinfo:=nil;
end;
procedure codegen_newmodule;
begin
exprasmlist:=taasmoutput.create;
datasegment:=taasmoutput.create;
codesegment:=taasmoutput.create;
bsssegment:=taasmoutput.create;
debuglist:=taasmoutput.create;
withdebuglist:=taasmoutput.create;
consts:=taasmoutput.create;
rttilist:=taasmoutput.create;
ResourceStringList:=Nil;
importssection:=nil;
exportssection:=nil;
resourcesection:=nil;
{ resourcestrings }
ResourceStrings:=TResourceStrings.Create;
{ use the librarydata from current_module }
objectlibrary:=current_module.librarydata;
end;
procedure codegen_donemodule;
{$ifdef MEMDEBUG}
var
d : tmemdebug;
{$endif}
begin
{$ifdef MEMDEBUG}
d:=tmemdebug.create(current_module.modulename^+' - asmlists');
{$endif}
exprasmlist.free;
codesegment.free;
bsssegment.free;
datasegment.free;
debuglist.free;
withdebuglist.free;
consts.free;
rttilist.free;
if assigned(ResourceStringList) then
ResourceStringList.free;
if assigned(importssection) then
importssection.free;
if assigned(exportssection) then
exportssection.free;
if assigned(resourcesection) then
resourcesection.free;
{$ifdef MEMDEBUG}
d.free;
{$endif}
{ resource strings }
ResourceStrings.free;
objectlibrary:=nil;
end;
function def_cgsize(def: tdef): tcgsize;
begin
case def.deftype of
orddef,
enumdef,
setdef:
begin
result := int_cgsize(def.size);
if is_signed(def) then
result := tcgsize(ord(result)+(ord(OS_S8)-ord(OS_8)));
end;
classrefdef,
pointerdef,
procvardef:
result := OS_ADDR;
stringdef :
begin
if is_ansistring(def) or is_widestring(def) then
result := OS_ADDR
else
result := OS_NO;
end;
objectdef :
begin
if is_class_or_interface(def) then
result := OS_ADDR
else
result := OS_NO;
end;
floatdef:
result := tfloat2tcgsize[tfloatdef(def).typ];
recorddef :
result:=int_cgsize(def.size);
arraydef :
begin
if not is_special_array(def) then
result := int_cgsize(def.size)
else
result := OS_NO;
end;
else
begin
{ undefined size }
result:=OS_NO;
end;
end;
end;
function int_cgsize(const l: aword): tcgsize;
begin
case l of
1 :
result := OS_8;
2 :
result := OS_16;
3,4 :
result := OS_32;
5..8 :
result := OS_64;
else
result:=OS_NO;
end;
end;
function inverse_opcmp(opcmp: topcmp): topcmp;
const
list: array[TOpCmp] of TOpCmp =
(OC_NONE,OC_NE,OC_LTE,OC_GTE,OC_LT,OC_GT,OC_EQ,OC_A,OC_AE,
OC_B,OC_BE);
begin
inverse_opcmp := list[opcmp];
end;
function commutativeop(op: topcg): boolean;
const
list: array[topcg] of boolean =
(true,true,true,false,false,true,true,false,false,
true,false,false,false,false,true);
begin
commutativeop := list[op];
end;
{$ifdef fixLeaksOnError}
procedure hcodegen_do_stop;
var p: pprocinfo;
begin
p := pprocinfo(procinfoStack.pop);
while p <> nil Do
begin
dispose(p,done);
p := pprocinfo(procinfoStack.pop);
end;
procinfoStack.done;
do_stop := hcodegen_old_do_stop;
do_stop{$ifdef FPCPROCVAR}(){$endif};
end;
begin
hcodegen_old_do_stop := do_stop;
do_stop := {$ifdef FPCPROCVAR}@{$endif}hcodegen_do_stop;
procinfoStack.init;
{$endif fixLeaksOnError}
end.
{
$Log$
Revision 1.29 2002-09-07 19:35:45 florian
+ tcg.direction is used now
Revision 1.28 2002/09/07 15:25:01 peter
* old logs removed and tabs fixed
Revision 1.27 2002/09/05 19:29:42 peter
* memdebug enhancements
Revision 1.26 2002/08/18 20:06:23 peter
* inlining is now also allowed in interface
* renamed write/load to ppuwrite/ppuload
* tnode storing in ppu
* nld,ncon,nbas are already updated for storing in ppu
Revision 1.25 2002/08/17 09:23:33 florian
* first part of procinfo rewrite
Revision 1.24 2002/08/11 14:32:26 peter
* renamed current_library to objectlibrary
Revision 1.23 2002/08/11 13:24:11 peter
* saving of asmsymbols in ppu supported
* asmsymbollist global is removed and moved into a new class
tasmlibrarydata that will hold the info of a .a file which
corresponds with a single module. Added librarydata to tmodule
to keep the library info stored for the module. In the future the
objectfiles will also be stored to the tasmlibrarydata class
* all getlabel/newasmsymbol and friends are moved to the new class
Revision 1.22 2002/08/06 20:55:20 florian
* first part of ppc calling conventions fix
Revision 1.21 2002/08/05 18:27:48 carl
+ more more more documentation
+ first version include/exclude (can't test though, not enough scratch for i386 :()...
Revision 1.20 2002/08/04 19:06:41 carl
+ added generic exception support (still does not work!)
+ more documentation
Revision 1.19 2002/07/20 11:57:53 florian
* types.pas renamed to defbase.pas because D6 contains a types
unit so this would conflicts if D6 programms are compiled
+ Willamette/SSE2 instructions to assembler added
Revision 1.18 2002/07/01 18:46:22 peter
* internal linker
* reorganized aasm layer
Revision 1.17 2002/05/20 13:30:40 carl
* bugfix of hdisponen (base must be set, not index)
* more portability fixes
Revision 1.16 2002/05/18 13:34:05 peter
* readded missing revisions
Revision 1.15 2002/05/16 19:46:35 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.13 2002/04/25 20:16:38 peter
* moved more routines from cga/n386util
Revision 1.12 2002/04/21 15:28:06 carl
- remove duplicate constants
- move some constants to cginfo
Revision 1.11 2002/04/20 21:32:23 carl
+ generic FPC_CHECKPOINTER
+ first parameter offset in stack now portable
* rename some constants
+ move some cpu stuff to other units
- remove unused constents
* fix stacksize for some targets
* fix generic size problems which depend now on EXTEND_SIZE constant
Revision 1.10 2002/04/07 09:13:39 carl
+ documentation
- remove unused variables
Revision 1.9 2002/04/04 19:05:54 peter
* removed unused units
* use tlocation.size in cg.a_*loc*() routines
Revision 1.8 2002/04/02 17:11:27 peter
* tlocation,treference update
* LOC_CONSTANT added for better constant handling
* secondadd splitted in multiple routines
* location_force_reg added for loading a location to a register
of a specified size
* secondassignment parses now first the right and then the left node
(this is compatible with Kylix). This saves a lot of push/pop especially
with string operations
* adapted some routines to use the new cg methods
Revision 1.7 2002/03/31 20:26:33 jonas
+ a_loadfpu_* and a_loadmm_* methods in tcg
* register allocation is now handled by a class and is mostly processor
independent (+rgobj.pas and i386/rgcpu.pas)
* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
* some small improvements and fixes to the optimizer
* some register allocation fixes
* some fpuvaroffset fixes in the unary minus node
* push/popusedregisters is now called rg.save/restoreusedregisters and
(for i386) uses temps instead of push/pop's when using -Op3 (that code is
also better optimizable)
* fixed and optimized register saving/restoring for new/dispose nodes
* LOC_FPU locations now also require their "register" field to be set to
R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
- list field removed of the tnode class because it's not used currently
and can cause hard-to-find bugs
}
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