GNU Assembler (x86/x86-64) grammar for Tree-sitter

A Tree-sitter grammar for GNU Assembler (GAS) targeting x86 and x86-64 architectures. Supports both AT&T and Intel syntax styles.

Features

Supported Syntax Styles

• AT&T Syntax: Full support with
  %
  register prefix (recommended)
• Intel Syntax: Full support with
  .intel_syntax
  directive and square bracket memory addressing

Comment Styles

• #
  - Line comments
• /* */
  - C-style block comments
• //
  - C++ style comments (in
  .S
  files with preprocessor)
• ;
  - Statement separator (also acts as line terminator)

Directives

• All standard GNU as directives (
  .global
  ,
  .section
  ,
  .ascii
  , etc.)
• Intel syntax directive:
  .intel_syntax
  with
  noprefix
  /
  prefix
  options

Memory Addressing

• AT&T:
  offset(%base, %index, scale)
  and
  %segment:offset
• Intel:
  [base + index*scale + offset]
  with size directives (
  byte ptr
  ,
  word ptr
  ,
  dword ptr
  ,
  qword ptr
  , etc.)

Installation for Helix Editor

Add to your

Then run:

Recommendations

For best results:

• Use AT&T syntax with
  %
  register prefix for reliable parsing
• Intel syntax without
  %
  prefix is supported but may have edge cases with symbol names

Testing

Run tests with:

Examples

AT&T Syntax (x86-64)

Intel Syntax

Related Projects

For ARM/ARM64 assembly, see tree-sitter-arm.