BCX+MSVC10+High level asm

[Emil_halim]

 implemented .for - .endfor for using in HighLevelAsm.

Example
======

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/********************************

  High level asm Example No 17
 
        By Emil Halim
 
          5-3-2013
*********************************/


$CPP
$NOMAIN
$NOWIN

#include "Windows.h"


FUNCTION main()

     !char* MyStr = "welcome....\n";
     raw ndx
     $AsmX
          ' using variable as a loop counter                   
          .for ndx = 5 to 10 
             cinvoke printf,MyStr
          .endfor
           
          ' using ecx rigester as a loop counter
          ' note well Printf will change ecx , so save it   
          .for ecx = 4 to 10 step 2
             push ecx                   
             cinvoke printf,MyStr     
             pop  ecx                 
          .endfor   
         
          ' using space memory in the stack as a loop counter
          ' do nt forget to blanced the stack when loop finished
          esp -= 4                 // allocate local variable
          .for [esp] = 5 to 10     // loop fro 5 to 10
             cinvoke printf,MyStr 
          .endfor                  //end the loop here
          esp += 4                 // de aloacate the local variable 
     $AsmX   
   
     Pause
END FUNCTION



[Emil_halim]

implemented masm label "@@:" with High Level Asm

here is example that has 2 procedures , both of them will convert string to value.

in the first one Ebx must hold string address , Ecx must hold end address of string

in the second one you call it by normal way.

the 2 procedures i got them from MASM forum and modified it.

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/********************************

  High level asm Example No 18
 
        By Emil Halim
 
          6-3-2013
*********************************/


$CPP
$NOMAIN
$NOWIN

#include "Windows.h"

FastProc atod_proc
$AsmX
     xor edx, edx           
   @@:
     movzx eax, byte ptr [ebx]   
     lea edx, [edx+4*edx]       
     lea edx, [2*edx+eax-48]     
     inc ebx
     cmp ecx, ebx       
     jne @B
     xchg eax, edx
     ret
$AsmX   
End FastProc

FastProc atod_proc_2
  $AsmX
         edx = [esp+4]              ; get first para in edx
         xor eax, eax               ; clear eax

   @@:   movzx ecx, byte ptr [edx]  ; move 1 byte into ecx
         lea eax, [eax+4*eax]       ; eax -> 5 * eax
         lea eax, [2*eax+ecx-30h]   ; eax -> 2 * eax + (ecx-30h)
         edx++                      ; inc edx
         cmp byte ptr [edx], 0      ; if end of string then return
         jne @b
         ret
  $AsmX   
End FastProc

FUNCTION main()
   
     !const char MyStr[] = "2000";
     raw ln ,value
     !ln = strlen( MyStr );
     
     ^ ebx = &MyStr        ; get str address into ebx         
     ^ ecx = ebx           ; copy ebx to ecx
     ^ ecx += ln           ; get length of str into ecx
     ^ call atod_proc      ; call the function
     ^ value =  eax        ; store result in value variable
     print  value     
     
     print  atod_proc_2(MyStr$)   
     Pause
END FUNCTION     


[Emil_halim]

also implemented Uses keyword that will save some registers in front of procedure and will be restored automatically when ret from procedure

Example
======

Code Select Expand


/********************************

  High level asm Example No 19
 
        By Emil Halim
 
          7-3-2013
*********************************/


$CPP
$NOMAIN
$NOWIN

#include "Windows.h"

FastProc Test
$AsmX
     'we want to save 2 registers esi and edi
     uses esi edi
     esi = [esp+4+8]  ;get first arg into esi
     edi = [esp+8+8]  ;get second arg into edi
     eax = esi        ; copy esi to eax
     eax += edi       ; add eax and edi
     ' here HiegLivelAsm will restore the saved registers 
     ret
$AsmX   
End FastProc

FUNCTION main()
       
     print  Test(10,20)   
     Pause
END FUNCTION



[Emil_halim]

if someone interesting,

here is the source code of bcx 6.9.9.1 & HighLevelAsm source code.

www.spoilerspace.com/bcxdx/cHLasm/BCX6_9_9_1&HighLevelAsm_1.zip

you must have MSVC10 to create BC translator with HighLevelAsm.

Feel free to improve and enhanced it.

thanks.

[dedndave]

if it helps, you can temporarily disable the assembler prologue and epilogue

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        OPTION  PROLOGUE:None
        OPTION  EPILOGUE:None

OpnFile PROC    lpFileName:LPSTR,dwOpenFlags:DWORD

;code
        ret     8   ;you must pop the parameters off the stack

OpnFile ENDP

        OPTION  PROLOGUE:PrologueDef
        OPTION  EPILOGUE:EpilogueDef

[Emil_halim]

thanks you.

actually  , we can make a function without frame stack by many way in bcx & HighLevelAsm & VC10

Example
======

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; FastProc Example
FastProc  GetVal
      ^ Eax = 100
      ^ ret
End FastProc


this will translated to that

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__declspec(naked) int GetVal(...)
{
  __asm{ 
           Mov Eax , 100
           ret
   }
}


second method is like that

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!#define FastProc __declspec(naked)
!FastProc int add1(int a, int b)
!{
     ^ eax  = a
     ^ eax += b
     ^ ret
!}


and yet another method that specific for VC10

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!#pragma optimize( "y", on )
function add(a as int,b as int)
   ^ eax  = a
   ^ eax += b
   ^ ret
end function
!#pragma optimize( "y", off )