{
Copyright (c) 2002 by Florian Klaempfl
Generic calling convention handling
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.
****************************************************************************
}
{# Parameter passing manager. Used to manage how
parameters are passed to routines.
}
unit paramgr;
{$i fpcdefs.inc}
interface
uses
globtype,
cpubase,cgbase,cgutils,
parabase,
aasmdata,
symconst,symtype,symsym,symdef;
type
{# This class defines some methods to take care of routine
parameters. It should be overridden for each new processor
}
{ tparamanager }
tparamanager = class
{ true if the location in paraloc can be reused as localloc }
function param_use_paraloc(const cgpara:tcgpara):boolean;virtual;
{ Returns true if the return value is actually a parameter pointer }
function ret_in_param(def:tdef;pd:tabstractprocdef):boolean;virtual;
{ Returns true if a result variable should be allocated for an assembler routine }
function asm_result_var(def:tdef;pd:tabstractprocdef):boolean;virtual;
function push_high_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;
function keep_para_array_range(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;
{ Returns true if a parameter is too large to copy and only
the address is pushed
}
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;abstract;
{ returns true if a parameter must be handled via copy-out (construct
a reference, copy the parameter's value there in case of copy-in/out, pass the reference)
}
function push_copyout_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;
{ return the size of a push }
function push_size(varspez:tvarspez;def : tdef;calloption : tproccalloption) : longint;virtual;
{# Returns a structure giving the information on
the storage of the parameter (which must be
an integer parameter). This is only used when calling
internal routines directly, where all parameters must
be 4-byte values.
In case the location is a register, this register is allocated.
Call freeintparaloc() after the call to free the locations again.
Default implementation: don't do anything at all (in case you don't
use register parameter passing)
@param(list Current assembler list)
@param(nr Parameter number of routine, starting from 1)
}
function get_para_align(calloption : tproccalloption):byte;virtual;
function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_address(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_flags(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;virtual;
{# Registers which must be saved when calling a routine declared as
cppdecl, cdecl, stdcall, safecall, palmossyscall. The registers
saved should be the ones as defined in the target ABI and / or GCC.
This value can be deduced from the CALLED_USED_REGISTERS array in the
GCC source.
}
function get_saved_registers_int(calloption : tproccalloption):tcpuregisterarray;virtual;
function get_saved_registers_address(calloption : tproccalloption):tcpuregisterarray;virtual;
function get_saved_registers_fpu(calloption : tproccalloption):tcpuregisterarray;virtual;
function get_saved_registers_mm(calloption : tproccalloption):tcpuregisterarray;virtual;
{ \brief Get a parameter location for calling a procdef directly instead of via a call node }
{ \returns parameter location in \c cgpara for parameter \c nr of \c pd }
procedure getcgtempparaloc(list: TAsmList; pd: tabstractprocdef; nr : longint; var cgpara: tcgpara);virtual;
{# allocate an individual pcgparalocation that's part of a tcgpara
@param(list Current assembler list)
@param(loc Parameter location element)
}
procedure allocparaloc(list: TAsmList; const paraloc: pcgparalocation);
{# allocate a parameter location created with create_paraloc_info
@param(list Current assembler list)
@param(loc Parameter location)
}
procedure alloccgpara(list: TAsmList; const cgpara: TCGPara); virtual;
{# free a parameter location allocated with alloccgpara
@param(list Current assembler list)
@param(loc Parameter location)
}
procedure freecgpara(list: TAsmList; const cgpara: TCGPara); virtual;
{ This is used to populate the location information on all parameters
for the routine as seen in either the caller or the callee. It returns
the size allocated on the stack
}
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;virtual;abstract;
{ Returns the location of the function result if p had def as
function result instead of its actual result. Used if the compiler
forces the function result to something different than the real
result. }
function get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;virtual;abstract;
function get_safecallresult_funcretloc(p : tabstractprocdef; side: tcallercallee): tcgpara; virtual;
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
{ This is used to populate the location information on all parameters
for the routine when it is being inlined. It returns
the size allocated on the stack
}
function create_inline_paraloc_info(p : tabstractprocdef):longint;virtual;
{ This is used to populate the location information on all parameters
for the routine that are passed as varargs. It returns
the size allocated on the stack (including the normal parameters)
}
function create_varargs_paraloc_info(p : tabstractprocdef; side: tcallercallee; varargspara:tvarargsparalist):longint;virtual;abstract;
function is_stack_paraloc(paraloc: pcgparalocation): boolean;virtual;
procedure createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;can_use_final_stack_loc : boolean;var cgpara:TCGPara);virtual;
procedure duplicatecgparaloc(const orgparaloc: pcgparalocation; intonewparaloc: pcgparalocation);
procedure duplicateparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
function parseparaloc(parasym : tparavarsym;const s : string) : boolean;virtual;
function parsefuncretloc(p : tabstractprocdef; const s : string) : boolean;virtual;
{ Convert a list of CGParaLocation entries to a RTTIParaLoc array that
can be written by ncgrtti }
function cgparalocs_to_rttiparalocs(paralocs:pcgparalocation):trttiparalocs;
{ allocate room for parameters on the stack in the entry code? }
function use_fixed_stack: boolean;
{ whether stack pointer can be changed in the middle of procedure }
function use_stackalloc: boolean;
{ Returns true for platforms where the parameters are part of the signature
and checked by the runtime/backend compiler (e.g. JVM, LLVM).
The default implementation returns false. }
function has_strict_proc_signature: boolean; virtual;
{ Returns true if parasym is unused and can be optimized. }
function can_opt_unused_para(parasym: tparavarsym): boolean;
strict protected
{ common part of get_funcretloc; returns true if retloc is completely
initialized afterwards }
function set_common_funcretloc_info(p : tabstractprocdef; forcetempdef: tdef; out retcgsize: tcgsize; out retloc: tcgpara): boolean;
{ common part of ret_in_param; is called by ret_in_param at the
beginning and every tparamanager descendant can decide to call it
itself as well; parameter retinparam is only valid if function
returns true }
function handle_common_ret_in_param(def:tdef;pd:tabstractprocdef;out retinparam:boolean):boolean;
{ returns the def to use for a tparalocation part of a cgpara for paradef,
for which the def is paradef and the integer length is restlen.
fullsize is true if restlen equals the full paradef size }
function get_paraloc_def(paradef: tdef; restlen: aint; fullsize: boolean): tdef;
{ convert a single CGParaLocation to a RTTIParaLoc; the method *might*
be overriden by targets to provide backwards compatibility with
older versions in case register indices changed }
function cgparaloc_to_rttiparaloc(paraloc:pcgparalocation):trttiparaloc;virtual;
end;
var
paramanager : tparamanager;
implementation
uses
systems,
globals,
cgobj,tgobj,
defutil,verbose,
hlcgobj;
{ true if the location in paraloc can be reused as localloc }
function tparamanager.param_use_paraloc(const cgpara:tcgpara):boolean;
begin
result:=false;
end;
{ true if uses a parameter as return value }
function tparamanager.ret_in_param(def:tdef;pd:tabstractprocdef):boolean;
begin
{ This handles all managed types, including COM interfaces and Variants }
if handle_common_ret_in_param(def,pd,result) then
exit;
ret_in_param:=(def.typ=arraydef) or
(def.typ=recorddef) or
(def.typ=stringdef) or
((def.typ=procvardef) and not tprocvardef(def).is_addressonly) or
((def.typ=objectdef) and (is_object(def))) or
((def.typ=setdef) and not is_smallset(def));
end;
{ true if a result variable should be allocated for an assembler routine }
function tparamanager.asm_result_var(def:tdef;pd:tabstractprocdef):boolean;
begin
if not(po_assembler in pd.procoptions) then
internalerror(2018021501);
result:=true;
end;
function tparamanager.push_high_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
push_high_param:=not(calloption in cdecl_pocalls) and
(
is_open_array(def) or
is_open_string(def) or
is_array_of_const(def)
);
end;
function tparamanager.keep_para_array_range(varspez: tvarspez; def: tdef; calloption: tproccalloption): boolean;
begin
result:=push_high_param(varspez,def,calloption);
end;
function tparamanager.push_copyout_param(varspez: tvarspez; def: tdef; calloption: tproccalloption): boolean;
begin
push_copyout_param:=false;
end;
{ return the size of a push }
function tparamanager.push_size(varspez:tvarspez;def : tdef;calloption : tproccalloption) : longint;
begin
push_size:=-1;
case varspez of
vs_constref,
vs_out,
vs_var :
push_size:=voidpointertype.size;
vs_value,
vs_const :
begin
if push_addr_param(varspez,def,calloption) then
push_size:=voidpointertype.size
else
begin
{ special array are normally pushed by addr, only for
cdecl array of const it comes here and the pushsize
is unknown }
if is_array_of_const(def) then
push_size:=0
else
push_size:=def.size;
end;
end;
else
;
end;
end;
function tparamanager.get_para_align(calloption : tproccalloption):byte;
begin
result:=std_param_align;
end;
function tparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_address(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_flags(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_saved_registers_int(calloption : tproccalloption):tcpuregisterarray;
const
inv: tcpuregisterarray = (RS_INVALID);
begin
result:=inv;
end;
function tparamanager.get_saved_registers_address(calloption : tproccalloption):tcpuregisterarray;
const
inv: tcpuregisterarray = (RS_INVALID);
begin
result:=inv;
end;
function tparamanager.get_saved_registers_fpu(calloption : tproccalloption):tcpuregisterarray;
const
inv: tcpuregisterarray = (RS_INVALID);
begin
result:=inv;
end;
function tparamanager.get_saved_registers_mm(calloption : tproccalloption):tcpuregisterarray;
const
inv: tcpuregisterarray = (RS_INVALID);
begin
result:=inv;
end;
{$if first_mm_imreg = 0}
{$WARN 4044 OFF} { Comparison might be always false ... }
{$endif}
procedure tparamanager.allocparaloc(list: TAsmList; const paraloc: pcgparalocation);
begin
case paraloc^.loc of
LOC_REGISTER,
LOC_CREGISTER:
begin
if getsupreg(paraloc^.register)<first_int_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
{$ifndef x86}
{ don't allocate ST(x), they're not handled by the register allocator }
LOC_FPUREGISTER,
LOC_CFPUREGISTER:
begin
if getsupreg(paraloc^.register)<first_fpu_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
{$endif not x86}
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
if getsupreg(paraloc^.register)<first_mm_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
else
;
end;
end;
procedure tparamanager.alloccgpara(list: TAsmList; const cgpara: TCGPara);
var
paraloc : pcgparalocation;
begin
paraloc:=cgpara.location;
while assigned(paraloc) do
begin
allocparaloc(list,paraloc);
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.freecgpara(list: TAsmList; const cgpara: TCGPara);
var
paraloc : Pcgparalocation;
href : treference;
begin
paraloc:=cgpara.location;
while assigned(paraloc) do
begin
case paraloc^.loc of
LOC_VOID:
;
LOC_REGISTER,
LOC_CREGISTER:
begin
if getsupreg(paraloc^.register)<first_int_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_FPUREGISTER,
LOC_CFPUREGISTER:
begin
if getsupreg(paraloc^.register)<first_fpu_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
if getsupreg(paraloc^.register)<first_mm_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_REFERENCE,
LOC_CREFERENCE :
begin
if use_fixed_stack then
begin
{ don't use reference_reset_base, because that will depend on cgobj }
fillchar(href,sizeof(href),0);
href.base:=paraloc^.reference.index;
href.offset:=paraloc^.reference.offset;
href.temppos:=ctempposinvalid;
tg.ungetiftemp(list,href);
end;
end;
else
internalerror(2004110212);
end;
paraloc:=paraloc^.next;
end;
end;
function tparamanager.get_safecallresult_funcretloc(p: tabstractprocdef; side: tcallercallee): tcgpara;
var
paraloc: pcgparalocation;
begin
result.init;
result.def:=ossinttype;
result.intsize:=result.def.size;
result.size:=def_cgsize(result.def);
result.alignment:=result.def.alignment;
paraloc:=result.add_location;
paraloc^.size:=result.size;
paraloc^.def:=result.def;
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT_REG
else
paraloc^.register:=NR_FUNCTION_RETURN_REG;
result.Temporary:=true;
end;
function tparamanager.is_stack_paraloc(paraloc: pcgparalocation): boolean;
begin
result:=
assigned(paraloc) and
(paraloc^.loc=LOC_REFERENCE) and
(paraloc^.reference.index=NR_STACK_POINTER_REG);
end;
procedure tparamanager.createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;can_use_final_stack_loc : boolean;var cgpara:TCGPara);
var
href : treference;
len : aint;
paraloc,
newparaloc : pcgparalocation;
begin
paraloc:=parasym.paraloc[callerside].location;
cgpara.reset;
cgpara.size:=parasym.paraloc[callerside].size;
cgpara.intsize:=parasym.paraloc[callerside].intsize;
cgpara.alignment:=parasym.paraloc[callerside].alignment;
cgpara.def:=parasym.paraloc[callerside].def;
while assigned(paraloc) do
begin
if paraloc^.size=OS_NO then
len:=push_size(parasym.varspez,parasym.vardef,calloption)
else
len:=tcgsize2size[paraloc^.size];
newparaloc:=cgpara.add_location;
newparaloc^.size:=paraloc^.size;
newparaloc^.def:=paraloc^.def;
{ shiftval overlaps with part of the reference, so it may be
different from 0 and if wr then force the newparaloc to a register
in the optimization below, shiftval will remain <> 0 }
if not(paraloc^.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
newparaloc^.shiftval:=paraloc^.shiftval;
{ $warning maybe release this optimization for all targets? }
{ released for all CPUs:
i386 isn't affected anyways because it uses the stack to push parameters
on arm it reduces executable size of the compiler by 2.1 per cent (FK) }
{ Does it fit a register? }
if ((not can_use_final_stack_loc and
use_fixed_stack) or
not is_stack_paraloc(paraloc)) and
(len<=sizeof(pint)) and
(paraloc^.size in [OS_8,OS_16,OS_32,OS_64,OS_128,OS_S8,OS_S16,OS_S32,OS_S64,OS_S128]) then
newparaloc^.loc:=LOC_REGISTER
else
newparaloc^.loc:=paraloc^.loc;
case newparaloc^.loc of
LOC_REGISTER :
begin
if (vo_has_explicit_paraloc in parasym.varoptions) and (paraloc^.loc = LOC_REGISTER) then
if getregtype(paraloc^.register) = R_ADDRESSREGISTER then
newparaloc^.register:=cg.getaddressregister(list)
else
newparaloc^.register:=cg.getintregister(list,paraloc^.size)
else
begin
{$ifdef cpu_uses_separate_address_registers}
if hlcg.def2regtyp(paraloc^.def) = R_ADDRESSREGISTER then
newparaloc^.register:=hlcg.getaddressregister(list,paraloc^.def)
else
{$endif}
newparaloc^.register:=cg.getintregister(list,paraloc^.size);
end;
end;
LOC_FPUREGISTER :
newparaloc^.register:=cg.getfpuregister(list,paraloc^.size);
LOC_MMREGISTER :
newparaloc^.register:=cg.getmmregister(list,paraloc^.size);
LOC_REFERENCE :
begin
if (can_use_final_stack_loc or
not use_fixed_stack) and
is_stack_paraloc(paraloc) then
duplicatecgparaloc(paraloc,newparaloc)
else
begin
if assigned(cgpara.def) then
tg.gethltemp(list,cgpara.def,len,tt_persistent,href)
else
tg.gettemp(list,len,cgpara.alignment,tt_persistent,href);
newparaloc^.reference.index:=href.base;
newparaloc^.reference.offset:=href.offset;
end;
end;
else
;
end;
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.duplicatecgparaloc(const orgparaloc: pcgparalocation; intonewparaloc: pcgparalocation);
begin
move(orgparaloc^,intonewparaloc^,sizeof(intonewparaloc^));
intonewparaloc^.next:=nil;
end;
procedure tparamanager.duplicateparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
var
paraloc,
newparaloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=parasym.paraloc[callerside].size;
cgpara.intsize:=parasym.paraloc[callerside].intsize;
cgpara.alignment:=parasym.paraloc[callerside].alignment;
paraloc:=parasym.paraloc[callerside].location;
while assigned(paraloc) do
begin
newparaloc:=cgpara.add_location;
duplicatecgparaloc(paraloc,newparaloc);
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
begin
if not assigned(p.funcretloc[side].Location) then
p.funcretloc[side]:=get_funcretloc(p,side,nil);
end;
function tparamanager.create_inline_paraloc_info(p : tabstractprocdef):longint;
begin
{ We need to return the size allocated }
p.init_paraloc_info(callbothsides);
result:=p.calleeargareasize;
end;
{ used by syscall conventions which require explicit paralocation support }
{ this is the standard implementation, CGs might overwrite it }
function tparamanager.parseparaloc(parasym: tparavarsym; const s: string): boolean;
var
paraloc : pcgparalocation;
begin
parasym.paraloc[callerside].alignment:=sizeof(pint);
paraloc:=parasym.paraloc[callerside].add_location;
paraloc^.loc:=LOC_REGISTER;
paraloc^.size:=def_cgsize(parasym.vardef);
paraloc^.def:=parasym.vardef;
paraloc^.register:=std_regnum_search(lowercase(s));
{ copy to callee side }
parasym.paraloc[calleeside].add_location^:=paraloc^;
result:=(paraloc^.register <> NR_NO) and
(paraloc^.register <> NR_STACK_POINTER_REG);
end;
function tparamanager.parsefuncretloc(p: tabstractprocdef; const s: string): boolean;
begin
Result:=False;
internalerror(200807236);
end;
function tparamanager.use_fixed_stack: boolean;
begin
{$ifdef i386}
result := target_info.stackalign > 4;
{$else i386}
{$ifdef cputargethasfixedstack}
result := true;
{$else cputargethasfixedstack}
result := false;
{$endif cputargethasfixedstack}
{$endif i386}
end;
{ This is a separate function because at least win64 allows stack allocations
despite of fixed stack semantics (actually supporting it requires generating
a compliant stack frame, not yet possible) }
function tparamanager.use_stackalloc: boolean;
begin
result:=not use_fixed_stack;
end;
function tparamanager.has_strict_proc_signature: boolean;
begin
result:=false;
end;
function tparamanager.set_common_funcretloc_info(p : tabstractprocdef; forcetempdef: tdef; out retcgsize: tcgsize; out retloc: tcgpara): boolean;
var
paraloc : pcgparalocation;
begin
result:=true;
retloc.init;
if not assigned(forcetempdef) then
retloc.def:=p.returndef
else
begin
retloc.def:=forcetempdef;
retloc.temporary:=true;
end;
retloc.alignment:=get_para_align(p.proccalloption);
{ void has no location }
if is_void(retloc.def) then
begin
paraloc:=retloc.add_location;
retloc.size:=OS_NO;
retcgsize:=OS_NO;
retloc.intsize:=0;
paraloc^.def:=retloc.def;
paraloc^.size:=OS_NO;
paraloc^.loc:=LOC_VOID;
exit;
end;
{ Constructors return self instead of a boolean }
if p.proctypeoption=potype_constructor then
begin
retloc.def:=tdef(p.owner.defowner);
if not (is_implicit_pointer_object_type(retloc.def) or
(retloc.def.typ<>objectdef)) then
retloc.def:=cpointerdef.getreusable_no_free(retloc.def);
end;
retcgsize:=def_cgsize(retloc.def);
retloc.intsize:=retloc.def.size;
retloc.size:=retcgsize;
{ Return is passed as var parameter }
if ret_in_param(retloc.def,p) then
begin
retloc.def:=cpointerdef.getreusable_no_free(retloc.def);
paraloc:=retloc.add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=retcgsize;
paraloc^.def:=retloc.def;
exit;
end;
result:=false;
end;
function tparamanager.handle_common_ret_in_param(def: tdef;
pd: tabstractprocdef; out retinparam: boolean): boolean;
begin
{ This must be system independent: safecall and record constructor result
is always returned in param.
Furthermore, any managed type is returned in param, in order to avoid
its finalization on exception at callee side. }
if ((tf_safecall_exceptions in target_info.flags) and
(pd.proccalloption=pocall_safecall)) or
(
(pd.proctypeoption=potype_constructor) and
(
is_record(def) or
(
(def.typ<>objectdef) and
(pd.owner.symtabletype=objectsymtable) and
is_objectpascal_helper(tdef(pd.owner.defowner))
)
)
) or is_managed_type(def) then
begin
retinparam:=true;
exit(true);
end;
if pd.proctypeoption=potype_constructor then
begin
retinparam:=false;
exit(true);
end;
result:=false;
end;
function tparamanager.get_paraloc_def(paradef: tdef; restlen: aint; fullsize: boolean): tdef;
begin
if fullsize then
result:=paradef
{ no support for 128 bit ints -> tcgsize2orddef can't handle
OS_(S)128 }
else if restlen in [1,2,4,8] then
result:=cgsize_orddef(int_cgsize(restlen))
else
result:=carraydef.getreusable_no_free(u8inttype,restlen);
end;
procedure tparamanager.getcgtempparaloc(list: TAsmList; pd: tabstractprocdef; nr : longint; var cgpara: tcgpara);
begin
if (nr<1) or (nr>pd.paras.count) then
InternalError(2013060101);
pd.init_paraloc_info(callerside);
cgpara:=tparavarsym(pd.paras[nr-1]).paraloc[callerside].getcopy;
end;
function tparamanager.cgparalocs_to_rttiparalocs(paralocs:pcgparalocation):trttiparalocs;
var
c : longint;
tmploc : pcgparalocation;
begin
c:=0;
tmploc:=paralocs;
result:=nil;
while assigned(tmploc) do
begin
inc(c);
tmploc:=tmploc^.next;
end;
setlength(result,c);
c:=0;
tmploc:=paralocs;
while assigned(tmploc) do
begin
result[c]:=cgparaloc_to_rttiparaloc(tmploc);
inc(c);
tmploc:=tmploc^.next;
end;
end;
function tparamanager.cgparaloc_to_rttiparaloc(paraloc:pcgparalocation):trttiparaloc;
var
reg : tregisterrec;
begin
{ Explicitly zero the whole record, to avoid
trouble as this record is used as is in a
hash calculation, which might give unreliable
results if the record as gaps between fields
due to field alignment. PM 2021-05-06 }
fillchar(result,sizeof(trttiparaloc),#0);
if paraloc^.Loc=LOC_REFERENCE then
begin
reg:=tregisterrec(paraloc^.reference.index);
result.offset:=paraloc^.reference.offset;
result.loctype:=$80;
end
else
begin
reg:=tregisterrec(paraloc^.register);
{ use sign extension }
result.offset:=paraloc^.shiftval;
result.loctype:=$00;
end;
case reg.regtype of
R_INTREGISTER,
R_FPUREGISTER,
R_MMXREGISTER,
R_MMREGISTER,
R_SPECIALREGISTER,
R_ADDRESSREGISTER:
begin
result.loctype:=result.loctype or ord(reg.regtype);
result.regsub:=ord(reg.subreg);
result.regindex:=reg.supreg;
end;
else
begin
{ no need to adjust loctype }
result.regsub:=0;
result.regindex:=0;
end;
end;
end;
function tparamanager.can_opt_unused_para(parasym: tparavarsym): boolean;
var
pd: tprocdef;
begin
{ The parameter can be optimized as unused when:
this optimization is enabled
this is a direct call to a routine, not a procvar
and the routine is not an exception filter
and the parameter is not used by the routine
and implementation of the routine is already processed.
}
result:=(cs_opt_unused_para in current_settings.optimizerswitches) and
assigned(parasym.Owner) and
(parasym.Owner.defowner.typ=procdef);
if not result then
exit;
pd:=tprocdef(parasym.Owner.defowner);
result:=(pd.proctypeoption<>potype_exceptfilter) and
not parasym.is_used and
pd.is_implemented;
end;
initialization
;
finalization
paramanager.free;
end.