https://github.com/notfoundry/ppasm

x86_64 macro assembler entirely in C preprocessor
https://github.com/notfoundry/ppasm

assembler metaprogramming preprocessor x86

Last synced: about 1 month ago
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x86_64 macro assembler entirely in C preprocessor

• Host: GitHub
• URL: https://github.com/notfoundry/ppasm
• Owner: notfoundry
• Created: 2020-02-25T12:43:59.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-03-01T23:39:20.000Z (over 4 years ago)
• Last Synced: 2024-02-17T10:36:34.817Z (7 months ago)
• Topics: assembler, metaprogramming, preprocessor, x86
• Language: C
• Size: 31.3 KB
• Stars: 37
• Watchers: 3
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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• awesome-c-preprocessor - notfoundry/ppasm - - x86_64 macro assembler entirely in C preprocessor. (Compilers/Interpreters)

README

        
# ppasm

Are you tired of executing your C compiler on your source code to get your binaries? With `ppasm`'s **fully-preprocessor x86_64 assembler**, you can skip the compiler and move straight to the action!

Let's take a look at some of `ppasm`'s killer features:

| ppasm | literally any C compiler |

|--|--|

| 4 phases of compilation, super speedy! | 8 phases of compilation, slow and boring... |

| No types at all, maximum productivity! | Static type system, kills prototyping speed... |

| Full-blown functional language for macros! | Crappy old macro system, a complete pain... |

| Unlimited flexibility, anything is possible! | Restricted semantics, C standard controls you... |

## Table of Contents

- [Overview](#overview)

- [Tutorial](#tutorial)

## Overview

TODO: Comparison with NASM syntax

## Tutorial

Let's take a simple example of a factorial. As a C program, this might look like:

```c

unsigned int fac(unsigned int n) {

	unsigned int acc = n;

	while (--n) acc *= n;

	return acc;

}

```

and in NASM assembly, this might be represented as:

```nasm

fac:

	mov eax, edi

	mov edx, edi

	sub edx, 1

	je .end

loop:

	imul eax, edx

	sub edx, 1

	jne .loop

	ret

end:

	mov eax, 1

	ret

```

But compiling that would take significant effort! One would have to invoke the entire C compiler (a heavyweight tool!) to produce a binary from the first snippet, and one would need to get a third-party assembler to do anything useful with the second. Not so with `ppasm`:

```c

#include 

assemble (

	mov (eax, edi),

	mov (edx, edi),

	sub (edx, 1),

	je (8R),

	label (8L, imul (eax, edx)),

	sub (edx, 1),

	jne (8L),

	label (8R, mov (eax, 1)),

	ret

)

```

By simply running this through your C preprocessor, the program will be compiled into a string containing the raw-escaped bytes of the assembled instructions! To get the final binary file, all one needs to do is run `printf "%b"` on the output and redirect the resulting binary stream into your file of choice!