Assembler toolkit based on AsmJit
C++ CMake C


Assembler toolkit based on AsmJit.


AsmTK is a sister project of AsmJit library, which provides concepts that are useful mostly in AOT code-generation.


This project just started and is not complete. AsmTK at the moment requires asmjit:next branch, which will soon replace asmjit:master.


  • Asm parser can parse everything that AsmJit provides (i.e. supports all instruction sets, named labels, etc...).
  • Asm parser can also parse instruction aliases defined by AsmTK (like movsb, cmpsb, sal, ...).
  • Assembles to CodeEmitter, which means that you can choose between Assembler and CodeBuilder at runtime.
  • More to be added :)

AsmParser Usage Guide

Assembler parsing is provided by AsmParser class, which emits to CodeEmitter:

#include <asmtk/asmtk.h>

using namespace asmjit;
using namespace asmtk;

// Used to print binary code as hex.
static void dumpCode(const uint8_t* buf, size_t len) {
  enum { kCharsPerLine = 39 };
  char hex[kCharsPerLine * 2 + 1];

  size_t i = 0;
  while (i < len) {
    size_t j = 0;
    size_t end = len - i < kCharsPerLine ? len - i : size_t(kCharsPerLine);

    end += i;
    while (i < end) {
      uint8_t b0 = buf[i] >> 4;
      uint8_t b1 = buf[i] & 15;

      hex[j++] = b0 < 10 ? '0' + b0 : 'A' + b0 - 10;
      hex[j++] = b1 < 10 ? '0' + b1 : 'A' + b1 - 10;

    hex[j] = '\0';

int main(int argc, char* argv[]) {
  // Setup a CodeHolder for X64.
  CodeInfo ci(ArchInfo::kTypeX64);
  CodeHolder code(ci);

  // Attach an assembler to the CodeHolder.
  X86Assembler a(&code);

  // Create AsmParser that will emit to X86Assembler.
  AsmParser p(&a);

  // Parse some assembly.
  Error err = p.parse(
    "mov eax, ebx\n"
    "vaddpd zmm0, zmm1, [eax + 128]\n");

  // Error handling (use asmjit::ErrorHandler for more robust error handling).
  if (err) {
    printf("ERROR: %08x (%s)\n", err, DebugUtils::errorAsString(err));
    return 1;

  // If we are done, you must detach the Assembler from CodeHolder or sync
  // it, so its internal state and position is synced with CodeHolder.

  // Now you can print the code, which is stored in the first section (.text).
  CodeBuffer& buffer = code.getSectionEntry(0)->getBuffer();
  dumpCode(buffer.getData(), buffer.getLength());

  return 0;

You should check out the test directory to see how AsmTK should be used.


Please consider a donation if you use the project and would like to keep it active in the future.

Authors & Maintainers