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+ added support for exception tags and for the 'throw' and 'catch' instructions

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in the wasm internal assembler and object writer
This commit is contained in:
Nikolay Nikolov 2021-09-27 21:44:09 +03:00
parent 82b6450f19
commit b463f2a141
7 changed files with 186 additions and 9 deletions
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6
compiler/aggas.pas
View File

@ -840,8 +840,6 @@ implementation
writer.AsmWrite(gas_wasm_basic_type_str[wasm_basic_typ]);
end;
writer.AsmLn;
writer.AsmWrite(hp.tagname);
writer.AsmWriteLn(':');
end;
{$endif WASM}
@ -1392,6 +1390,10 @@ implementation
{ the dotted name is the name of the actual function entry }
writer.AsmWrite('.');
end
else if tai_symbol(hp).sym.typ=AT_WASM_EXCEPTION_TAG then
begin
{ nothing here, to ensure we don' write the .type directive for exception tags }
end
else
begin
if ((target_info.system <> system_arm_linux) and (target_info.system <> system_arm_android)) or

2
compiler/assemble.pas
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@ -1842,6 +1842,8 @@ Implementation
TWasmObjData(ObjData).DeclareGlobalType(tai_globaltype(hp));
ait_functype:
TWasmObjData(ObjData).DeclareFuncType(tai_functype(hp));
ait_tagtype:
TWasmObjData(ObjData).DeclareTagType(tai_tagtype(hp));
ait_export_name:
TWasmObjData(ObjData).DeclareExportName(tai_export_name(hp));
ait_import_module:

1
compiler/ogbase.pas
View File

@ -118,6 +118,7 @@ interface
RELOC_MEMORY_ADDR_OR_TABLE_INDEX_SLEB,
RELOC_TYPE_INDEX_LEB,
RELOC_GLOBAL_INDEX_LEB,
RELOC_TAG_INDEX_LEB,
{$endif WASM32}
{ Relative relocation }
RELOC_RELATIVE,

132
compiler/ogwasm.pas
View File

@ -47,6 +47,7 @@ interface
FuncIndex: Integer;
SymbolIndex: Integer;
GlobalIndex: Integer;
TagIndex: Integer;
AliasOf: string;
ExtraData: TWasmObjSymbolExtraData;
constructor create(AList:TFPHashObjectList;const AName:string);override;
@ -66,6 +67,7 @@ interface
TWasmObjSymbolExtraData = class(TFPHashObject)
TypeIdx: Integer;
ExceptionTagTypeIdx: Integer;
ImportModule: string;
ImportName: string;
ExportName: string;
@ -105,8 +107,10 @@ interface
function AddOrCreateObjSymbolExtraData(const symname:TSymStr): TWasmObjSymbolExtraData;
function AddFuncType(wft: TWasmFuncType): integer;
function globalref(asmsym:TAsmSymbol):TObjSymbol;
function ExceptionTagRef(asmsym:TAsmSymbol):TObjSymbol;
procedure DeclareGlobalType(gt: tai_globaltype);
procedure DeclareFuncType(ft: tai_functype);
procedure DeclareTagType(tt: tai_tagtype);
procedure DeclareExportName(en: tai_export_name);
procedure DeclareImportModule(aim: tai_import_module);
procedure DeclareImportName(ain: tai_import_name);
@ -328,6 +332,7 @@ implementation
FuncIndex:=-1;
SymbolIndex:=-1;
GlobalIndex:=-1;
TagIndex:=-1;
AliasOf:='';
ExtraData:=nil;
end;
@ -345,6 +350,7 @@ implementation
begin
inherited Create(HashObjectList,s);
TypeIdx:=-1;
ExceptionTagTypeIdx:=-1;
end;
procedure TWasmObjSymbolExtraData.AddLocal(bastyp: TWasmBasicType);
@ -617,6 +623,18 @@ implementation
CurrObjSec.ObjRelocations.Add(objreloc);
WriteUleb5(CurrObjSec,0);
end;
RELOC_TAG_INDEX_LEB:
begin
if len<>5 then
internalerror(2021092712);
if Data<>0 then
internalerror(2021092713);
if not assigned(p) then
internalerror(2021092714);
objreloc:=TWasmObjRelocation.CreateSymbol(CurrObjSec.Size,p,Reloctype);
CurrObjSec.ObjRelocations.Add(objreloc);
WriteSleb5(CurrObjSec,0);
end;
else
internalerror(2021092501);
end;
@ -655,6 +673,19 @@ implementation
result:=nil;
end;
function TWasmObjData.ExceptionTagRef(asmsym: TAsmSymbol): TObjSymbol;
begin
if assigned(asmsym) then
begin
if asmsym.typ<>AT_WASM_EXCEPTION_TAG then
internalerror(2021092707);
result:=symbolref(asmsym);
result.typ:=AT_WASM_EXCEPTION_TAG;
end
else
result:=nil;
end;
procedure TWasmObjData.DeclareGlobalType(gt: tai_globaltype);
var
ObjSymExtraData: TWasmObjSymbolExtraData;
@ -675,6 +706,19 @@ implementation
ObjSymExtraData.TypeIdx:=i;
end;
procedure TWasmObjData.DeclareTagType(tt: tai_tagtype);
var
ObjSymExtraData: TWasmObjSymbolExtraData;
ft: TWasmFuncType;
i: Integer;
begin
ObjSymExtraData:=AddOrCreateObjSymbolExtraData(tt.tagname);
ft:=TWasmFuncType.Create([],tt.params);
i:=AddFuncType(ft);
ft.free;
ObjSymExtraData.ExceptionTagTypeIdx:=i;
end;
procedure TWasmObjData.DeclareExportName(en: tai_export_name);
var
ObjSymExtraData: TWasmObjSymbolExtraData;
@ -1022,6 +1066,13 @@ implementation
objsec.Data.seek(objrel.DataOffset);
WriteUleb5(objsec.Data,TWasmObjSymbol(objrel.symbol).GlobalIndex);
end;
RELOC_TAG_INDEX_LEB:
begin
if not assigned(objrel.symbol) then
internalerror(2021092716);
objsec.Data.seek(objrel.DataOffset);
WriteSleb5(objsec.Data,TWasmObjSymbol(objrel.symbol).TagIndex);
end;
else
internalerror(2021092510);
end;
@ -1130,6 +1181,15 @@ implementation
WriteUleb(relout,objrel.DataOffset+objsec.FileSectionOfs);
WriteUleb(relout,TWasmObjSymbol(objrel.symbol).SymbolIndex);
end;
RELOC_TAG_INDEX_LEB:
begin
if not assigned(objrel.symbol) then
internalerror(2021092717);
Inc(relcount^);
WriteByte(relout,Ord(R_WASM_TAG_INDEX_LEB));
WriteUleb(relout,objrel.DataOffset+objsec.FileSectionOfs);
WriteUleb(relout,TWasmObjSymbol(objrel.symbol).SymbolIndex);
end;
else
internalerror(2021092507);
end;
@ -1146,12 +1206,14 @@ implementation
types_count,
imports_count, NextImportFunctionIndex, NextFunctionIndex,
section_nr, code_section_nr, data_section_nr,
NextGlobalIndex: Integer;
NextGlobalIndex, NextTagIndex: Integer;
import_globals_count: Integer = 0;
globals_count: Integer = 0;
import_functions_count: Integer = 0;
export_functions_count: Integer = 0;
functions_count: Integer = 0;
import_exception_tags_count: Integer = 0;
exception_tags_count: Integer = 0;
objsym, ObjSymAlias: TWasmObjSymbol;
cust_sec: TWasmCustomSectionType;
begin
@ -1166,6 +1228,11 @@ implementation
for i:=0 to Data.ObjSymbolList.Count-1 do
begin
objsym:=TWasmObjSymbol(Data.ObjSymbolList[i]);
if objsym.typ=AT_WASM_EXCEPTION_TAG then
if objsym.bind=AB_EXTERNAL then
Inc(import_exception_tags_count)
else
Inc(exception_tags_count);
if objsym.typ=AT_WASM_GLOBAL then
if objsym.bind=AB_EXTERNAL then
Inc(import_globals_count)
@ -1236,7 +1303,7 @@ implementation
end;
end;
imports_count:=2+import_globals_count+import_functions_count;
imports_count:=2+import_globals_count+import_functions_count+import_exception_tags_count;
WriteUleb(FWasmSections[wsiImport],imports_count);
{ import memories }
WriteName(FWasmSections[wsiImport],'env');
@ -1293,6 +1360,26 @@ implementation
WriteByte(FWasmSections[wsiImport],$70); { funcref }
WriteByte(FWasmSections[wsiImport],$00); { min }
WriteUleb(FWasmSections[wsiImport],1); { 1 }
{ import tags }
NextTagIndex:=0;
for i:=0 to Data.ObjSymbolList.Count-1 do
begin
objsym:=TWasmObjSymbol(Data.ObjSymbolList[i]);
if (objsym.typ=AT_WASM_EXCEPTION_TAG) and (objsym.bind=AB_EXTERNAL) then
begin
objsym.TagIndex:=NextTagIndex;
Inc(NextTagIndex);
objsym.ExtraData:=TWasmObjSymbolExtraData(FData.FObjSymbolsExtraDataList.Find(objsym.Name));
if objsym.ExtraData.ImportModule<>'' then
WriteName(FWasmSections[wsiImport],objsym.ExtraData.ImportModule)
else
WriteName(FWasmSections[wsiImport],'env');
WriteName(FWasmSections[wsiImport],objsym.Name);
WriteByte(FWasmSections[wsiImport],$04); { tag }
WriteByte(FWasmSections[wsiImport],$00); { exception }
WriteUleb(FWasmSections[wsiImport],objsym.ExtraData.ExceptionTagTypeIdx);
end;
end;
WriteUleb(FWasmSections[wsiFunction],functions_count);
NextFunctionIndex:=NextImportFunctionIndex;
@ -1307,6 +1394,23 @@ implementation
end;
end;
if exception_tags_count>0 then
begin
WriteUleb(FWasmSections[wsiTag],exception_tags_count);
for i:=0 to Data.ObjSymbolList.Count-1 do
begin
objsym:=TWasmObjSymbol(Data.ObjSymbolList[i]);
if (objsym.typ=AT_WASM_EXCEPTION_TAG) and (objsym.bind<>AB_EXTERNAL) then
begin
objsym.TagIndex:=NextTagIndex;
Inc(NextTagIndex);
objsym.ExtraData:=TWasmObjSymbolExtraData(FData.FObjSymbolsExtraDataList.Find(objsym.Name));
WriteByte(FWasmSections[wsiTag],$00); { exception }
WriteUleb(FWasmSections[wsiTag],objsym.ExtraData.ExceptionTagTypeIdx);
end;
end;
end;
if globals_count>0 then
begin
WriteUleb(FWasmSections[wsiGlobal],globals_count);
@ -1382,7 +1486,24 @@ implementation
for i:=0 to Data.ObjSymbolList.Count-1 do
begin
objsym:=TWasmObjSymbol(Data.ObjSymbolList[i]);
if objsym.typ=AT_WASM_GLOBAL then
if objsym.typ=AT_WASM_EXCEPTION_TAG then
begin
objsym.SymbolIndex:=FWasmSymbolTableEntriesCount;
Inc(FWasmSymbolTableEntriesCount);
WriteByte(FWasmSymbolTable,Ord(SYMTAB_EVENT));
if objsym.bind=AB_GLOBAL then
WriteUleb(FWasmSymbolTable,0)
else if objsym.bind=AB_LOCAL then
WriteUleb(FWasmSymbolTable,WASM_SYM_BINDING_LOCAL)
else if objsym.bind=AB_EXTERNAL then
WriteUleb(FWasmSymbolTable,WASM_SYM_UNDEFINED)
else
internalerror(2021092715);
WriteUleb(FWasmSymbolTable,objsym.TagIndex);
if objsym.bind<>AB_EXTERNAL then
WriteName(FWasmSymbolTable,objsym.Name);
end
else if objsym.typ=AT_WASM_GLOBAL then
begin
objsym.SymbolIndex:=FWasmSymbolTableEntriesCount;
Inc(FWasmSymbolTableEntriesCount);
@ -1488,6 +1609,11 @@ implementation
Inc(section_nr);
WriteWasmSection(wsiFunction);
Inc(section_nr);
if exception_tags_count>0 then
begin
WriteWasmSection(wsiTag);
Inc(section_nr);
end;
if globals_count>0 then
begin
WriteWasmSection(wsiGlobal);

42
compiler/wasm32/aasmcpu.pas
View File

@ -764,6 +764,23 @@ uses
internalerror(2021092625);
end;
end;
a_catch,
a_throw:
begin
if ops<>1 then
internalerror(2021092709);
with oper[0]^ do
case typ of
top_ref:
begin
if not assigned(ref^.symbol) or (ref^.base<>NR_NO) or (ref^.index<>NR_NO) or (ref^.offset<>0) then
internalerror(2021092711);
result:=6;
end;
else
internalerror(2021092710);
end;
end;
else
internalerror(2021092623);
end;
@ -1461,6 +1478,31 @@ uses
internalerror(2021092625);
end;
end;
a_catch,
a_throw:
begin
case opcode of
a_catch:
WriteByte($07);
a_throw:
WriteByte($08);
else
internalerror(2021092708);
end;
if ops<>1 then
internalerror(2021092709);
with oper[0]^ do
case typ of
top_ref:
begin
if not assigned(ref^.symbol) or (ref^.base<>NR_NO) or (ref^.index<>NR_NO) or (ref^.offset<>0) then
internalerror(2021092711);
objdata.writeReloc(0,5,TWasmObjData(ObjData).ExceptionTagRef(ref^.symbol),RELOC_TAG_INDEX_LEB);
end;
else
internalerror(2021092710);
end;
end;
else
internalerror(2021092624);
end;

7
compiler/wasm32/nwasmutil.pas
View File

@ -42,7 +42,7 @@ implementation
uses
globtype,globals,
cpubase,
aasmdata,aasmcpu,
aasmbase,aasmdata,aasmtai,aasmcpu,
hlcgobj,hlcgcpu,
symdef,symtype,symconst,
fmodule;
@ -72,7 +72,10 @@ implementation
list.Concat(tai_globaltype.create(STACK_POINTER_SYM,wbt_i32,false));
if ts_wasm_native_exceptions in current_settings.targetswitches then
list.Concat(tai_tagtype.create(FPC_EXCEPTION_TAG_SYM, []));
begin
list.Concat(tai_tagtype.create(FPC_EXCEPTION_TAG_SYM, []));
list.Concat(tai_symbol.Create(current_asmdata.DefineAsmSymbol(FPC_EXCEPTION_TAG_SYM,AB_LOCAL,AT_WASM_EXCEPTION_TAG,nil),0));
end;
for i:=0 to current_module.deflist.Count-1 do
begin

5
compiler/wasmbase.pas
View File

@ -43,7 +43,8 @@ type
wsiElement = 9,
wsiCode = 10,
wsiData = 11,
wsiDataCount = 12);
wsiDataCount = 12,
wsiTag = 13);
TWasmCustomSectionType = (
wcstLinking,
@ -68,7 +69,7 @@ type
R_WASM_GLOBAL_INDEX_LEB = 7,
R_WASM_FUNCTION_OFFSET_I32 = 8,
R_WASM_SECTION_OFFSET_I32 = 9,
R_WASM_EVENT_INDEX_LEB = 10,
R_WASM_TAG_INDEX_LEB = 10,
R_WASM_GLOBAL_INDEX_I32 = 13,
R_WASM_MEMORY_ADDR_LEB64 = 14,
R_WASM_MEMORY_ADDR_SLEB64 = 15,