I created a macro library that simulates high-level syntax for direct conditional jumps; and I hope you'll find some good use for it :green
It's purpose is to allow the programmer to implement conditional jumps directly after using an instruction which affects the eflags, without the need to create a label for each case.
The macros included are:
- fIf <<flag>>
- fElse
- fElseIf <<flag>
- fEndIf
- fRepeat
- fUntil <<flag>>
- fWhile <<flag>>
- fEndw
- fBreak
- fBreakIf <<flag>>
Here's an example code that utilizes the library, I hope it clears the point:
.data
samplestr db "hello world",0
.code
mov edi,offset samplestr
mov ecx,lengthof samplestr-1
mov eax,'r'
repne scasb
fIf <<z>>
xor eax,eax
inc eax
fElse
xor eax,eax
fEndIf[attachment deleted by admin]
DoomyD,
Nice work, this macro simplyfies the ASM writing yet more then it already is.
I had a quick look at the code and it seems nice, I will test it as soon as I get home.
can you give a better example? i mean one that actually does something that built in code can't.
this code works just fine:
.if zero?
xor eax,eax
inc eax
.else
xor eax,eax
.enid
or "setz al"
For example, the opcodes JA, JBE, JG, JGE, GL, GLE, JNA, JNBE, JNG, JNGE, JNL and JNLE would require you to assemble a complex .if
NG, for instance, requires the following combination:zero? || sign? && !overflow? || !sign? && overflow? which assembles to 5 conditional jump instructions, while the macro will generate a single instruction.