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{
Copyright (c) 2019 by Dmitry Boyarintsev
WebAssembly-specific code for call 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 nwasmcal;
{$i fpcdefs.inc}
interface
uses
cgbase,
symtype,symdef,cgutils,parabase,
node,ncal,ncgcal,hlcgobj,aasmcpu,cpubase, wasmdef;
type
{ twasmcallparanode }
twasmcallparanode = class(tcgcallparanode)
end;
{ twasmcallnode }
twasmcallnode = class(tcgcallnode)
protected
procedure extra_post_call_code; override;
procedure do_release_unused_return_value; override;
procedure set_result_location(realresdef: tstoreddef); override;
end;
implementation
uses
globtype, aasmdata, defutil, tgobj, hlcgcpu, symconst;
{ twasmcallnode }
procedure twasmcallnode.extra_post_call_code;
begin
thlcgwasm(hlcg).g_adjust_stack_after_call(current_asmdata.CurrAsmList,procdefinition);
end;
procedure twasmcallnode.do_release_unused_return_value;
begin
if is_void(resultdef) then
exit;
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_drop));
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
end;
procedure twasmcallnode.set_result_location(realresdef: tstoreddef);
begin
// default implementation is placing the return value on LOC_REGISTER.
// WebAssembly always returns the value on stack.
location_reset_ref(location,LOC_REFERENCE,def_cgsize(realresdef),1,[]);
tg.gethltemp(current_asmdata.CurrAsmList,realresdef,retloc.intsize,tt_normal,location.reference);
end;
begin
ccallnode:=twasmcallnode;
ccallparanode:=twasmcallparanode;
end.
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