checking data type, typecast in proc - Forums

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is there anyway i can check and see what kind of data is it? for example:


 disease macro width, height
         ;codec...
 disease endm

how can i tell if width is dword, or byte? or even real4,8,10? is this possible with macro? what about procedure?


 disease proc width, height
         ;codec...
 disease endm

how can i check the data type of width inside a proc? NOTE: I don't want to check the data type at runtime, i want to check it at COMPILE TIME. one last question:


 in C for example: disease(0, (real8)width, (real8)height);

(real8) <--- is a typecast. what i want to know is: is it necessary in asm? and how do i create such proc with typecast in masm??

Posted on 2001-07-01 20:49:00 by disease_2000

checking data type, typecast in proc

This is really one of the problems I have with MASM - the line length limit is the other biggie. You can't check the type of data that is passed. If you have the MASM documentation: read chapter 9! I've thought of a way to accomplish more with macros, but it would mean passing the type as part of the parameter - something like:

. But that really isn't practical - I'd rather rewrite MASM. ;)

From Chapter 9: A macro can use OPATTR to determine if an argument is a constant, a register, or a memory operand. With this information, the macro can conditionally generate the most efficient code depending on argument type.


 Bit	Set If expression
-----  -------------------
  0     References a code label
  1     Is a memory variable or has a relocatable data label
  2     Is an immediate value
  3     Uses direct memory addressing
  4     Is a register value
  5     References no undefined symbols and is without error
  6     Is relative to SS
  7     References an external label
 8�10   Has the following language type:
        000 � No language type
        001 � C
        010 � SYSCALL
        011 � STDCALL
        100 � Pascal
        101 � FORTRAN
        110 � Basic

This message was edited by bitRAKE, on 7/2/2001 12:08:49 AM

Posted on 2001-07-02 00:05:00 by bitRAKE

checking data type, typecast in proc

Try the SIZEOF macro instruction


a1   BYTE  0
a2   WORD  0
a3   DWORD 0
a4   REAL8 0

(SIZEOF a1) is 1
(SIZEOF a2) is 2
(SIZEOF a3) is 4
(SIZEOF a4) is 8

You can add suitable tests on the macro arguments to determine the arg type and take whatever action.

Posted on 2001-07-02 01:09:00 by Ernie

checking data type, typecast in proc

alot of thank for both of you guy reply. that answered my question.

Posted on 2001-07-02 09:38:00 by disease_2000

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