Structure Error

[vengy]

Hi,

Strange Struct Bug?

StructBug.asm(26) : Error A2145: INVOKE argument type mismatch: argument 1
StructBug.asm: 44 lines, 1 passes, 15 ms, 0 warnings, 1 errors

Why does jwasm report Error A2145?

See simple code example below:

Thanks!

;--- assemble: JWasm -coff /FlStructBug.lst StructBug.asm
    .386
    .MODEL FLAT, stdcall
    option casemap:none
ExitProcess   proto :dword
MySub PROTO :DWORD
MyStructA STRUCT
FieldA DWORD ?
MyStructA ENDS
MyStructB STRUCT
FieldA DWORD ?
FieldB DWORD ?
MyStructB ENDS
    .CODE
main proc c
    INVOKE MySub,MyStructA
;why does MyStructB generate an error but MyStructA doesn't
    INVOKE MySub,MyStructB
    ret
main endp
MySub PROC argA:DWORD
RET
MySub ENDP
;--- entry
mainCRTStartup proc c
    invoke  main
    invoke  ExitProcess, eax
mainCRTStartup endp
    END mainCRTStartup

[japheth]

> Why does jwasm report Error A2145?

It's a bug - a struct name as argument for INVOKE is supposed to push the struct's size. jwasm erroneously checks this size and wants it to match the parameter's size.

workaround: use SIZEOF before the struct name: invoke MySub, sizeof MyStructB

[vengy]

Thanks for the quick response.
Took a QUICK look at Invoke.c - INVOKE_ARGUMENT_TYPE_MISMATCH
If you have a the general area of where the bug is, I can try to resolve it. :)

[japheth]

> If you have a the general area of where the bug is, I can try to resolve it. :)

Thanks for the offer, but this bug is relatively simple to fix! The next prerelease will contain this fix in invoke.c:

                asize = SizeFromRegister( opnd.base_reg->tokval );
            //} else if ( opnd.mem_type == MT_EMPTY ) { /* v2.10: a TYPE may return mem_type != MT_EMPTY! */
            } else if ( opnd.kind == EXPR_CONST || opnd.mem_type == MT_EMPTY ) {
                asize = psize;

[vengy]

Tested it and it works…. Thanks again!