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{
Copyright (c) 2013 by Jonas Maebe, member of the Free Pascal Compiler
development team
Generate llvm bitcode for constants
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 nllvmcon;
{$i fpcdefs.inc}
interface
uses
symtype,
node,ncgcon;
type
tllvmrealconstnode = class(tcgrealconstnode)
function pass_1 : tnode;override;
procedure pass_generate_code;override;
end;
tllvmstringconstnode = class(tcgstringconstnode)
procedure pass_generate_code; override;
protected
procedure load_dynstring(const strpointerdef: tdef; const elementdef: tdef; const winlikewidestring: boolean); override;
end;
implementation
uses
globtype,globals,verbose,cutils,
symbase,symtable,symconst,symdef,symsym,defutil,
aasmdata,aasmcnst,
ncon,
llvmbase,aasmllvm,hlcgobj,
cgbase,cgutils;
{*****************************************************************************
tllvmstringconstnode
*****************************************************************************}
procedure tllvmstringconstnode.pass_generate_code;
var
datadef, resptrdef: tdef;
hreg: tregister;
begin
inherited pass_generate_code;
if cst_type in [cst_conststring,cst_shortstring] then
begin
if location.loc<>LOC_CREFERENCE then
internalerror(2014071202);
case cst_type of
cst_conststring:
{ this kind of string const is used both for array of char
constants (-> excludes terminating #0) and pchars (-> includes
terminating #0). The resultdef excludes the #0 while the data
includes it -> insert typecast from datadef to resultdef }
datadef:=carraydef.getreusable(cansichartype,len+1);
cst_shortstring:
{ the resultdef of the string constant is the type of the
string to which it is assigned, which can be longer or shorter
than the length of the string itself -> typecast it to the
correct string type }
datadef:=carraydef.getreusable(cansichartype,min(len,255)+1);
else
internalerror(2014071203);
end;
{ get address of array as pchar }
resptrdef:=cpointerdef.getreusable(resultdef);
hreg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,resptrdef);
hlcg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,datadef,resptrdef,location.reference,hreg);
hlcg.reference_reset_base(location.reference,resptrdef,hreg,0,location.reference.alignment);
end;
end;
procedure tllvmstringconstnode.load_dynstring(const strpointerdef: tdef; const elementdef: tdef; const winlikewidestring: boolean);
var
stringtype: tstringtype;
strrecdef: trecorddef;
offset: pint;
field: tfieldvarsym;
llvmfield: tllvmshadowsymtableentry;
dataptrdef: tdef;
reg: tregister;
href: treference;
begin
case cst_type of
cst_ansistring:
stringtype:=st_ansistring;
cst_unicodestring:
stringtype:=st_unicodestring;
cst_widestring:
stringtype:=st_widestring;
else
internalerror(2014040804);
end;
{ get the recorddef for this string constant }
strrecdef:=ctai_typedconstbuilder.get_dynstring_rec(stringtype,winlikewidestring,len);
{ offset in the record of the the string data }
offset:=ctai_typedconstbuilder.get_string_symofs(stringtype,winlikewidestring);
{ field corresponding to this offset }
field:=trecordsymtable(strrecdef.symtable).findfieldbyoffset(offset);
llvmfield:=trecordsymtable(strrecdef.symtable).llvmst[field];
if llvmfield.fieldoffset<>field.fieldoffset then
internalerror(2015061001);
{ pointerdef to the string data array }
dataptrdef:=cpointerdef.getreusable(field.vardef);
{ load the address of the string data }
reg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,dataptrdef);
reference_reset_symbol(href,lab_str,0,const_align(strpointerdef.size));
current_asmdata.CurrAsmList.concat(
taillvm.getelementptr_reg_size_ref_size_const(reg,cpointerdef.getreusable(strrecdef),href,
s32inttype,field.llvmfieldnr,true));
{ convert into a pointer to the individual elements }
hlcg.a_load_reg_reg(current_asmdata.CurrAsmList,dataptrdef,strpointerdef,reg,location.register);
end;
{*****************************************************************************
tllvmrealconstnode
*****************************************************************************}
function tllvmrealconstnode.pass_1 : tnode;
begin
result:=nil;
expectloc:=LOC_FPUREGISTER;
end;
procedure tllvmrealconstnode.pass_generate_code;
begin
{ llvm supports floating point constants directly }
location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
location.register:=hlcg.getfpuregister(current_asmdata.CurrAsmList,resultdef);
case tfloatdef(resultdef).floattype of
s32real,s64real:
current_asmdata.CurrAsmList.concat(taillvm.op_reg_size_fpconst_size(la_bitcast,location.register,resultdef,value_real,resultdef));
{ comp and currency are handled as int64 at the llvm level }
s64comp,
s64currency:
{ sc80floattype instead of resultdef, see comment in thlcgllvm.a_loadfpu_ref_reg }
current_asmdata.CurrAsmList.concat(taillvm.op_reg_size_const_size(la_sitofp,location.register,s64inttype,trunc(value_real),sc80floattype));
{$ifdef cpuextended}
s80real,sc80real:
current_asmdata.CurrAsmList.concat(taillvm.op_reg_size_fpconst80_size(la_bitcast,location.register,resultdef,value_real,resultdef));
{$endif cpuextended}
else
internalerror(2013102501);
end;
end;
begin
cstringconstnode:=tllvmstringconstnode;
crealconstnode:=tllvmrealconstnode;
end.
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