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{
Copyright (c) 2015 by Jonas Maebe
This unit implements llvm support for 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 nllvmbas;
{$i fpcdefs.inc}
interface
uses
globtype,cclasses,
aasmbase,aasmtai,aasmdata,
nbas,ncgbas,
symsym;
type
tllvmasmnode = class(tcgasmnode)
protected
{ map a tasmsymbol to an index in fsymboldata }
fsymbollookup: THashSet;
{ the LLVM symbolic inline assembly operands to which the ones in the
source code are mapped }
fsymboldata: tfplist;
function getllvmasmopindexforsym(sym: tabstractnormalvarsym): longint;
function getllvmasmparasym(sym: tabstractnormalvarsym): tasmsymbol;
procedure ResolveRef(const filepos: tfileposinfo; var op: toper); override;
public
constructor create(p : TAsmList); override;
destructor destroy; override;
procedure pass_generate_code; override;
end;
tllvmtempinfoaccessor = class(ttempinfoaccessor)
protected
class procedure settempinfoflags(tempinfo: ptempinfo; const flags: ttempinfoflags); override;
end;
tllvmtempcreatenode = class(tcgtempcreatenode)
procedure pass_generate_code;override;
end;
implementation
uses
verbose,cutils,
cgbase,cgutils,paramgr,
symconst,symdef,procinfo,
node,
cpubase,llvmbase,aasmllvm
;
{*****************************************************************************
TLLVMASMNODE
*****************************************************************************}
function tllvmasmnode.getllvmasmopindexforsym(sym: tabstractnormalvarsym): longint;
var
key: record
sym: pointer;
end;
res: PHashSetItem;
callpara: pllvmcallpara;
begin
key.sym:=sym;
res:=fsymbollookup.FindOrAdd(@key,sizeof(key));
if not assigned(res^.Data) then
begin
new(callpara);
callpara^.def:=cpointerdef.getreusable(sym.vardef);
if (sym.typ=paravarsym) and
paramanager.push_addr_param(sym.varspez,sym.vardef,current_procinfo.procdef.proccalloption) then
callpara^.def:=cpointerdef.getreusable(callpara^.def);
callpara^.sret:=false;
callpara^.byval:=false;
callpara^.valueext:=lve_none;
callpara^.loc:=LOC_REGISTER;
{ address must be a temp register }
if (sym.localloc.loc<>LOC_REFERENCE) or
(sym.localloc.reference.base=NR_NO) or
(sym.localloc.reference.index<>NR_NO) or
(sym.localloc.reference.offset<>0) or
assigned(sym.localloc.reference.symbol) then
internalerror(2016111001);
callpara^.reg:=sym.localloc.reference.base;
fsymboldata.add(callpara);
ptruint(res^.Data):=fsymboldata.count-1;
end;
result:=longint(ptruint(res^.Data));
end;
function tllvmasmnode.getllvmasmparasym(sym: tabstractnormalvarsym): tasmsymbol;
begin
{ these have to be transformed from `nr into into $nr; we use ` because
we also have to double all other occurrences of '$' in the assembly
code, and we can't differentiate between these and other '$'s in
agllvm }
result:=current_asmdata.RefAsmSymbol('`'+tostr(getllvmasmopindexforsym(sym)),AT_DATA,false);
end;
procedure tllvmasmnode.ResolveRef(const filepos: tfileposinfo; var op: toper);
var
sym: tabstractnormalvarsym;
ref: treference;
sofs: pint;
indexreg : tregister;
getoffset: boolean;
{$ifdef x86}
scale : byte;
{$endif x86}
begin
{ pure assembler routines are handled by the regular code generator }
if po_assembler in current_procinfo.procdef.procoptions then
begin
inherited;
exit;
end;
{ translate all symbolic references to "parameters" of the llvm
assembler statements }
case op.typ of
top_local:
begin
sofs:=op.localoper^.localsymofs;
indexreg:=op.localoper^.localindexreg;
{$ifdef x86}
scale:=op.localoper^.localscale;
{$endif x86}
getoffset:=op.localoper^.localgetoffset;
sym:=tabstractnormalvarsym(op.localoper^.localsym);
dispose(op.localoper);
case sym.localloc.loc of
LOC_REFERENCE:
begin
if getoffset then
begin
{ todo: print proper error. You cannot get the offset
of a local variable since it may be in a register
outside the assembler block with llvm }
internalerror(2016102001);
end
else
begin
op.typ:=top_ref;
new(op.ref);
reference_reset_symbol(op.ref^,getllvmasmparasym(sym),sofs,
newalignment(sym.localloc.reference.alignment,sofs),[]);
op.ref^.index:=indexreg;
{$ifdef x86}
op.ref^.scalefactor:=scale;
{$endif x86}
end;
end
else
{ all locals accessed from assembler are forced into memory
by FPC }
internalerror(2016101506);
end;
end;
else
;
end;
end;
constructor tllvmasmnode.create(p: TAsmList);
begin
inherited;
end;
destructor tllvmasmnode.destroy;
begin
{ normally already freed in pass_generate_code, but in case an error
occurred that may not have happened }
fsymboldata.free;
fsymbollookup.free;
inherited;
end;
procedure tllvmasmnode.pass_generate_code;
var
oldasmlist: tasmlist;
asmai: tai;
begin
oldasmlist:=nil;
if not(po_assembler in current_procinfo.procdef.procoptions) and
not(nf_get_asm_position in flags) then
begin
{ store the assembler code in a separate list, so we can make it
the argument of an asmblock instruction }
oldasmlist:=current_asmdata.CurrAsmList;
current_asmdata.CurrAsmList:=tasmlist.create;
{ record relation between parameters and replaced local assembler
operands }
fsymboldata:=tfplist.create;
fsymbollookup:=THashSet.Create(8,True,False);
end;
inherited;
if not(po_assembler in current_procinfo.procdef.procoptions) and
not(nf_get_asm_position in flags) then
begin
asmai:=taillvm.asm_paras(current_asmdata.CurrAsmList,fsymboldata);
fsymboldata:=nil;
fsymbollookup.free;
fsymbollookup:=nil;
oldasmlist.concat(asmai);
current_asmdata.CurrAsmList:=oldasmlist;
end;
end;
{*****************************************************************************
TLLVMTEMPINFOACCESSOR
*****************************************************************************}
class procedure tllvmtempinfoaccessor.settempinfoflags(tempinfo: ptempinfo; const flags: ttempinfoflags);
begin
{ it is not possible to typecast between e.g. an integer and a record
in a register, which is a problem if such a typecast is performed on
an lvalue (since we then have to store it first to a temp in memory,
which means we no longer have an lvalue).
Disable regvars altogether since LLVM will put the values in registers
anyway if possible/useful. }
inherited settempinfoflags(tempinfo,flags-[ti_may_be_in_reg]);
end;
{*****************************************************************************
TTEMPCREATENODE
*****************************************************************************}
procedure tllvmtempcreatenode.pass_generate_code;
begin
inherited;
{ if a temp is in a register and we never assign anything to it (e.g.
because it's the register for an inlined function result that never
gets assigned a value), then llvm will be confused the first time
we try to read from it (since it's never been defined) -> always
immediately assign undef to such registers }
if tempinfo^.location.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_FPUREGISTER,
LOC_CFPUREGISTER,LOC_MMREGISTER,LOC_CMMREGISTER] then
current_asmdata.CurrAsmList.concat(
taillvm.op_reg_size_undef(la_bitcast,tempinfo^.location.register,tempinfo^.typedef)
);
end;
begin
casmnode:=tllvmasmnode;
ctempinfoaccessor:=tllvmtempinfoaccessor;
ctempcreatenode:=tllvmtempcreatenode;
end.
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