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{
Copyright (c) 1998-2002, 2021 by Florian Klaempfl and Nikolay Nikolov
Generate WebAssembly inline 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 nwasminl;
{$i fpcdefs.inc}
interface
uses
node,ncginl;
type
{ twasminlinenode }
twasminlinenode = class(tcginlinenode)
private
procedure second_high; override;
procedure second_memory_size;
procedure second_memory_grow;
procedure second_unreachable;
public
function pass_typecheck_cpu: tnode; override;
function first_cpu: tnode; override;
procedure pass_generate_code_cpu; override;
procedure second_length;override;
end;
implementation
uses
ninl,compinnr,
cpubase,
aasmbase,aasmdata,aasmcpu,
cgbase,cgutils,
hlcgobj,hlcgcpu,
defutil,pass_2,verbose,
symtype,symdef;
{*****************************************************************************
twasminlinenode
*****************************************************************************}
procedure twasminlinenode.second_high;
var
hightype: TWasmBasicType;
begin
secondpass(left);
if not(is_dynamic_array(left.resultdef)) then
Internalerror(2019122801);
{ determine the WasmBasicType of the result }
if is_64bit(resultdef) then
hightype:=wbt_i64
else
hightype:=wbt_i32;
{ length in dynamic arrays is at offset -sizeof(pint) }
thlcgwasm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
{ 64-bit pointer values need a <>0 comparison to produce a 32-bit int on the stack (0 or 1) for the 'if' instruction.
32-bit pointer values don't need it, because 'if' already expects and pops a 32-bit int and checks for <>0. }
if is_64bit(left.resultdef) then
begin
thlcgwasm(hlcg).a_load_const_stack(current_asmdata.CurrAsmList,left.resultdef,0,R_INTREGISTER);
thlcgwasm(hlcg).a_cmp_stack_stack(current_asmdata.CurrAsmList,left.resultdef,OC_NE);
end;
{ if not nil }
current_asmdata.CurrAsmList.Concat(taicpu.op_functype(a_if,TWasmFuncType.Create([],[hightype])));
thlcgwasm(hlcg).incblock;
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
{ volatility of the dyn. array refers to the volatility of the
string pointer, not of the string data }
thlcgwasm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
{ length in dynamic arrays is at offset -ossinttype.size }
thlcgwasm(hlcg).a_op_const_stack(current_asmdata.CurrAsmList,OP_SUB,left.resultdef,ossinttype.size);
{ load length }
if ossinttype.size=8 then
current_asmdata.CurrAsmList.Concat(taicpu.op_const(a_i64_load,0))
else
current_asmdata.CurrAsmList.Concat(taicpu.op_const(a_i32_load,0));
{ else }
current_asmdata.CurrAsmList.Concat(taicpu.op_none(a_else));
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
{ high=-1 }
thlcgwasm(hlcg).a_load_const_stack(current_asmdata.CurrAsmList,resultdef,-1,R_INTREGISTER);
{ endif }
current_asmdata.CurrAsmList.Concat(taicpu.op_none(a_end_if));
thlcgwasm(hlcg).decblock;
location_reset(location,LOC_REGISTER,def_cgsize(resultdef));
{$if not defined(cpu64bitalu) and not defined(cpuhighleveltarget)}
if location.size in [OS_64,OS_S64] then
begin
location.register64.reglo := cg.getintregister(current_asmdata.CurrAsmList,OS_32);
location.register64.reghi := cg.getintregister(current_asmdata.CurrAsmList,OS_32);
end
else
{$endif}
location.register := hlcg.getintregister(current_asmdata.CurrAsmList,resultdef);
thlcgwasm(hlcg).a_load_stack_loc(current_asmdata.CurrAsmList,resultdef,location);
end;
procedure twasminlinenode.second_memory_size;
begin
current_asmdata.CurrAsmList.Concat(taicpu.op_none(a_memory_size));
thlcgwasm(hlcg).incstack(current_asmdata.CurrAsmList,1);
location_reset(location,LOC_REGISTER,def_cgsize(resultdef));
location.register:=hlcg.getregisterfordef(current_asmdata.CurrAsmList,resultdef);
thlcgwasm(hlcg).a_load_stack_loc(current_asmdata.CurrAsmList,resultdef,location);
end;
procedure twasminlinenode.second_memory_grow;
begin
secondpass(left);
hlcg.location_force_reg(current_asmdata.CurrAsmList,left.location,left.resultdef,left.resultdef,false);
thlcgwasm(hlcg).a_load_reg_stack(current_asmdata.CurrAsmList,left.resultdef,left.location.register);
current_asmdata.CurrAsmList.Concat(taicpu.op_none(a_memory_grow));
location_reset(location,LOC_REGISTER,def_cgsize(resultdef));
location.register:=hlcg.getregisterfordef(current_asmdata.CurrAsmList,resultdef);
thlcgwasm(hlcg).a_load_stack_loc(current_asmdata.CurrAsmList,resultdef,location);
end;
procedure twasminlinenode.second_unreachable;
begin
location_reset(location,LOC_VOID,OS_NO);
current_asmdata.CurrAsmList.Concat(taicpu.op_none(a_unreachable));
end;
function twasminlinenode.pass_typecheck_cpu: tnode;
begin
Result:=nil;
case inlinenumber of
in_wasm32_memory_size:
begin
CheckParameters(0);
resultdef:=u32inttype;
end;
in_wasm32_memory_grow:
begin
CheckParameters(1);
resultdef:=u32inttype;
end;
in_wasm32_unreachable:
begin
CheckParameters(0);
resultdef:=voidtype;
end;
else
Result:=inherited pass_typecheck_cpu;
end;
end;
function twasminlinenode.first_cpu: tnode;
begin
Result:=nil;
case inlinenumber of
in_wasm32_memory_size,
in_wasm32_memory_grow:
expectloc:=LOC_REGISTER;
in_wasm32_unreachable:
expectloc:=LOC_VOID;
else
Result:=inherited first_cpu;
end;
end;
procedure twasminlinenode.pass_generate_code_cpu;
begin
case inlinenumber of
in_wasm32_memory_size:
second_memory_size;
in_wasm32_memory_grow:
second_memory_grow;
in_wasm32_unreachable:
second_unreachable;
else
inherited pass_generate_code_cpu;
end;
end;
procedure twasminlinenode.second_length;
var
lendef : tdef;
href : treference;
extra_slots: LongInt;
begin
secondpass(left);
if is_shortstring(left.resultdef) then
begin
location_copy(location,left.location);
location.size:=OS_8;
end
else
begin
{ length in ansi/wide strings and high in dynamic arrays is at offset -sizeof(pint) }
hlcg.location_force_reg(current_asmdata.CurrAsmList,left.location,left.resultdef,left.resultdef,false);
thlcgwasm(hlcg).a_cmp_const_reg_stack(current_asmdata.CurrAsmList,left.resultdef,OC_EQ,0,left.location.register);
current_asmdata.CurrAsmList.Concat(taicpu.op_functype(a_if,TWasmFuncType.Create([],[wbt_i32])));
thlcgwasm(hlcg).incblock;
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
current_asmdata.CurrAsmList.Concat(taicpu.op_const(a_i32_const,0));
thlcgwasm(hlcg).incstack(current_asmdata.CurrAsmList,1);
current_asmdata.CurrAsmList.Concat( taicpu.op_none(a_else) );
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
{ the length of a widestring is a 32 bit unsigned int. Since every
character occupies 2 bytes, on a 32 bit platform you can express
the maximum length using 31 bits. On a 64 bit platform, it may be
32 bits. This means that regardless of the platform, a location
with size OS_SINT/ossinttype can hold the length without
overflowing (this code returns an ossinttype value) }
if is_widestring(left.resultdef) then
lendef:=u32inttype
else
lendef:=ossinttype;
{ volatility of the ansistring/widestring refers to the volatility of the
string pointer, not of the string data }
hlcg.reference_reset_base(href,left.resultdef,left.location.register,-lendef.size,ctempposinvalid,lendef.alignment,[]);
extra_slots:=thlcgwasm(hlcg).prepare_stack_for_ref(current_asmdata.CurrAsmList,href,false);
thlcgwasm(hlcg).a_load_ref_stack(current_asmdata.CurrAsmList,lendef,href,extra_slots);
if is_widestring(left.resultdef) then
thlcgwasm(hlcg).a_op_const_stack(current_asmdata.CurrAsmList,OP_SHR,resultdef,1);
{ Dynamic arrays do not have their length attached but their maximum index }
if is_dynamic_array(left.resultdef) then
thlcgwasm(hlcg).a_op_const_stack(current_asmdata.CurrAsmList,OP_ADD,resultdef,1);
current_asmdata.CurrAsmList.Concat( taicpu.op_none(a_end_if) );
thlcgwasm(hlcg).decblock;
location_reset(location,LOC_REGISTER,def_cgsize(resultdef));
location.register:=hlcg.getregisterfordef(current_asmdata.CurrAsmList,resultdef);
thlcgwasm(hlcg).a_load_stack_loc(current_asmdata.CurrAsmList,resultdef,location);
end;
end;
begin
cinlinenode:=twasminlinenode;
end.
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