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+ Wasm internal linker, object reader: implemented parsing of the type section

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This commit is contained in:
Nikolay Nikolov 2023-12-24 14:57:16 +02:00
parent 2626b85984
commit a08c937beb
1 changed files with 122 additions and 1 deletions
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123
compiler/ogwasm.pas
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@ -184,9 +184,12 @@ interface
TWasmObjInput = class(TObjInput)
private
FFuncTypes: array of TWasmFuncType;
function ReadUleb(r: TObjectReader; out v: uint64): boolean;
public
constructor create;override;
destructor Destroy;override;
class function CanReadObjData(AReader:TObjectreader):boolean;override;
function ReadObjData(AReader:TObjectreader;out ObjData:TObjData):boolean;override;
end;
@ -2131,6 +2134,18 @@ implementation
cobjdata:=TWasmObjData;
end;
destructor TWasmObjInput.Destroy;
var
i: Integer;
begin
for i:=low(FFuncTypes) to high(FFuncTypes) do
begin
FFuncTypes[i].free;
FFuncTypes[i]:=nil;
end;
inherited Destroy;
end;
class function TWasmObjInput.CanReadObjData(AReader: TObjectreader): boolean;
var
ModuleMagic: array [0..3] of Byte;
@ -2160,14 +2175,116 @@ implementation
SectionSize: uint64;
SectionStart: LongInt;
TypeSectionRead: Boolean = false;
function ReadCustomSection: Boolean;
begin
Result:=False;
end;
function ReadTypeSection: Boolean;
var
FuncTypesCount, ParamsCount, ResultsCount: uint64;
FuncTypeId, WasmTypeId: Byte;
i, j: Integer;
wbt: TWasmBasicType;
begin
Result:=False;
if TypeSectionRead then
begin
InputError('Type section is duplicated');
exit;
end;
TypeSectionRead:=True;
if not ReadUleb(AReader, FuncTypesCount) then
begin
InputError('Error reading the func types count');
exit;
end;
if AReader.Pos>(SectionStart+SectionSize) then
begin
InputError('The func types count stretches beyond the end of the type section');
exit;
end;
if FuncTypesCount>high(uint32) then
begin
InputError('The func types count does not fit in an unsigned 32-bit int');
exit;
end;
SetLength(FFuncTypes,FuncTypesCount);
for i:=0 to FuncTypesCount - 1 do
begin
FFuncTypes[i]:=TWasmFuncType.Create([],[]);
if not AReader.read(FuncTypeId,1) then
begin
InputError('Error reading the function type identifier');
exit;
end;
if FuncTypeId<>$60 then
begin
InputError('Incorrect function type identifier (expected $60, got $' + HexStr(FuncTypeId,2) + ')');
exit;
end;
if not ReadUleb(AReader, ParamsCount) then
begin
InputError('Error reading the function parameters count');
exit;
end;
if AReader.Pos>(SectionStart+SectionSize) then
begin
InputError('The function paramaters count stretches beyond the end of the type section');
exit;
end;
if ParamsCount>high(uint32) then
begin
InputError('The function parameters count does not fit in an unsigned 32-bit int');
exit;
end;
for j:=0 to ParamsCount-1 do
begin
if not AReader.read(WasmTypeId,1) then
begin
InputError('Error reading a function parameter basic type');
exit;
end;
if not decode_wasm_basic_type(WasmTypeId,wbt) then
begin
InputError('Unknown function parameter basic type: $' + HexStr(WasmTypeId,2));
exit;
end;
FFuncTypes[i].add_param(wbt);
end;
if not ReadUleb(AReader, ResultsCount) then
begin
InputError('Error reading the function results count');
exit;
end;
if AReader.Pos>(SectionStart+SectionSize) then
begin
InputError('The function results count stretches beyond the end of the type section');
exit;
end;
if ResultsCount>high(uint32) then
begin
InputError('The function results count does not fit in an unsigned 32-bit int');
exit;
end;
for j:=0 to ResultsCount-1 do
begin
if not AReader.read(WasmTypeId,1) then
begin
InputError('Error reading a function result basic type');
exit;
end;
if not decode_wasm_basic_type(WasmTypeId,wbt) then
begin
InputError('Unknown function result basic type: $' + HexStr(WasmTypeId,2));
exit;
end;
FFuncTypes[i].add_result(wbt);
end;
end;
result:=AReader.Pos=(SectionStart+SectionSize);
end;
function ReadImportSection: Boolean;
@ -2233,7 +2350,11 @@ implementation
Byte(wsiCustom):
Result := ReadCustomSection;
Byte(wsiType):
Result := ReadTypeSection;
if not ReadTypeSection then
begin
InputError('Error reading the type section');
exit;
end;
Byte(wsiImport):
Result := ReadImportSection;
Byte(wsiFunction):