chibicc-dumper

A JSON dumper tool derived from chibicc that can output C language tokens and ASTs.

Please note that this English version of the document was machine-translated and then partially edited, so it may contain inaccuracies. We welcome pull requests to correct any errors in the text.

What is this?

For developers implementing FFI bridges, the implementation process is monotonous yet requires significant effort to fine-tune. Implementing this part forces developers to choose between 3 approaches:

"Outputting metadata from the target language system and using it to generate C source code for the glue,"
Or "Parsing the C source code in some crude way and generating the glue code from that."
Alternatively, they might give up on both and resort to the even more tedious task of outputting both from "Something abstract like IDL."

While it is impossible to fully automate all of this work, what if we could easily obtain token sequences or AST information from the C source code? It might be possible to automatically generate bridge code from such information. This means we can treat the C source code as a primary source of metadata—something we had previously given up on.

And this tool is designed to make that a reality. It is a compact tool created by removing the code generator from the chibicc source code and modifying it to output this information as JSON. It dumps the output of the tokenizer and parser as JSON.

For example, given this minimal translation unit (sample.c):

int x;

Running chibicc-dumper --dump-tokens --dump-ast sample.c produces:

{
  "types": [
    {
      "id": 1,
      "kind": "TY_INT",
      "size": 4,
      "align": 4,
      "isUnsigned": false,
      "isAtomic": false,
      "originTypeId": null,
      "name": "x",
      "nameToken": {
        "file": "sample.c",
        "line": 1,
        "lexeme": "x"
      }
    }
  ],
  "tokens": [
    {
      "kind": "TK_IDENT",
      "lexeme": "int",
      "file": "sample.c",
      "line": 1,
      "atBol": true,
      "hasSpace": false
    },
    {
      "kind": "TK_IDENT",
      "lexeme": "x",
      "file": "sample.c",
      "line": 1,
      "atBol": false,
      "hasSpace": true
    },
    {
      "kind": "TK_PUNCT",
      "lexeme": ";",
      "file": "sample.c",
      "line": 1,
      "atBol": false,
      "hasSpace": false
    },
    {
      "kind": "TK_EOF",
      "lexeme": "",
      "file": "sample.c",
      "line": 2,
      "atBol": true,
      "hasSpace": false
    }
  ],
  "ast": {
    "kind": "program",
    "globals": [
      {
        "name": "x",
        "typeId": 1,
        "align": 4,
        "isLocal": false,
        "isFunction": false,
        "isDefinition": true,
        "isStatic": false,
        "isTentative": true,
        "isTls": false
      }
    ]
  }
}

It might also be useful simply as an aid to learning chibicc, helping you analyze what kinds of token sequences and ASTs are generated.

Clang can generate an AST

However, it has been officially stated that this output is not stable. On the other hand, chibicc is sufficiently stable, and neither its tokens nor its AST are likely to change.

Environment

Debian or Ubuntu DEB package distribution (native binary CLI; depends primarily on libc)
NPM package (CLI, library; no dependencies on other packages)

Install

You can install it on your system using the pre-built packages,

Debian trixie, bookworm: amd64, i686, arm64, armv7l (32-bit), and riscv64
Ubuntu 24.04, 22.04: amd64 and arm64

Or, you can use the chibicc-dumper NPM package for TypeScript/JavaScript using WASM:

npm install chibicc-dumper

The package also exposes the chibicc-dumper CLI command, so you can run it directly with npx or through your package manager's bin shim:

npx chibicc-dumper --dump-tokens --dump-ast sample.c

Alternatively, build the tool with make:

make

The executable is generated as ./chibicc-dumper.

Usage

CLI

chibicc-dumper [--dump-tokens] [--dump-ast] [ -E ] [ -M | -MD ] [ -o <path> ] <file>

The dumper accepts a single C translation unit as input.

--dump-tokens Dumps the raw phase 1 tokenizer output before preprocessing.
--dump-ast Dumps the phase 2 parser output after preprocessing.
--dump-tokens --dump-ast Emits one JSON document containing both views.
-o <path> Writes the JSON output to a file instead of standard output.

Preprocessor-oriented options such as -I, -idirafter, -include, -D, -U, -x c|none, -E, and -M* are still supported because they are useful for front-end analysis.

The npm package CLI uses the same command-line format:

npx chibicc-dumper --dump-ast sample.c

Examples

Dump raw tokens to standard output:

chibicc-dumper --dump-tokens sample.c

Dump the parsed AST to a file:

chibicc-dumper --dump-ast -o sample.ast.json sample.c

Dump both tokens and AST in one JSON document:

chibicc-dumper --dump-tokens --dump-ast -o sample.full.json sample.c

TypeScript / JavaScript NPM package

The packaged API embeds the WASM binary into the generated JavaScript bundle, so it does not need to fetch an external .wasm file at runtime. Each API call creates a fresh WASM instance, runs chibicc-dumper, and disposes that instance immediately after collecting the result.

Use dumpJson() when you want the raw JSON text, or dump() when you want the parsed JavaScript object. dump() returns the typed ChibiccDumperDumpResult shape by default, so you can narrow on isFunction and kind.

import {
  dump,
  dumpJson,
  type ChibiccDumperFunctionObject,
} from 'chibicc-dumper';

const json = await dumpJson({
  inputPath: 'main.c',
  source: 'int main(void) { return 0; }\n',
});

const result = await dump({
  inputPath: 'main.c',
  source: 'int main(void) { return 0; }\n',
});

if (result.ast) {
  const main = result.ast.globals.find(
    (global): global is ChibiccDumperFunctionObject =>
      global.isFunction && global.name === 'main'
  );
  const firstStatement = main?.body.body[0];

  if (
    firstStatement?.kind === 'ND_RETURN' &&
    firstStatement.lhs?.kind === 'ND_NUM'
  ) {
    console.log(firstStatement.lhs.value);
  }
}

console.log(json);

Builtin headers bundled with chibicc are available automatically, so standard includes such as #include <stddef.h> work without extra setup.

import { dump, type ChibiccDumperVariableObject } from 'chibicc-dumper';

const result = await dump({
  inputPath: 'main.c',
  source: '#include <stddef.h>\nsize_t value;\n',
});

const global = result.ast?.globals.find(
  (entry): entry is ChibiccDumperVariableObject => !entry.isFunction
);

console.log(global?.name);
console.log(global?.typeId);

Project-specific files can be provided through the files option or through synchronous host callbacks. Virtual paths are normalized under /workspace, so #include "foo.h" from main.c resolves to /workspace/foo.h.

import { dump, type ChibiccDumperFunctionObject } from 'chibicc-dumper';

const result = await dump({
  inputPath: 'main.c',
  source: '#include "foo.h"\nint main(void) { return VALUE; }\n',
  host: {
    readFile: (path) => {
      if (path === '/workspace/foo.h') {
        return '#define VALUE 7\n';
      }
      return undefined;
    },
  },
});

const main = result.ast?.globals.find(
  (global): global is ChibiccDumperFunctionObject =>
    global.isFunction && global.name === 'main'
);
const firstStatement = main?.body.body[0];

if (
  firstStatement?.kind === 'ND_RETURN' &&
  firstStatement.lhs?.kind === 'ND_NUM'
) {
  console.log(firstStatement.lhs.value);
}

The main options are:

inputPath: virtual path of the main translation unit.
source: contents of the main translation unit.
files: additional virtual files keyed by path.
includePaths: extra virtual include roots.
dumpTokens: include token data in the JSON output.
dumpAst: include AST data in the JSON output.
host.readFile: synchronously provide file contents for #include resolution.
host.getFileTimestamp: override file timestamps used by the preprocessor.
host.emitWarning: receive non-fatal diagnostics from the runtime bridge.

JSON structure

The output is always a single JSON object. The top-level shape is:

{
  "types": [...],
  "tokens": [...],
  "ast": {
    "kind": "program",
    "globals": [...]
  },
  "scopes": [...],
  "tags": [...],
  "typedefs": [...]
}

types is always present. tokens is present only when --dump-tokens is requested. ast, scopes, tags, and typedefs are present only when --dump-ast is requested.

Token entries contain lexical information such as token kind, source lexeme, source file, line number, beginning-of-line state, and whitespace information. Comment tokens (TK_COMMENT) additionally include commentStyle, endLine, and stripped comment text. For example:

{
  "types": [],
  "tokens": [
    {
      "kind": "TK_IDENT",
      "lexeme": "int",
      "file": "sample.c",
      "line": 1,
      "atBol": true,
      "hasSpace": false
    },
    {
      "kind": "TK_PP_NUM",
      "lexeme": "42",
      "file": "sample.c",
      "line": 1,
      "atBol": false,
      "hasSpace": true
    }
  ]
}

AST output contains normalized type references through fields such as typeId, baseTypeId, and returnTypeId. Function definitions appear under ast.globals, and statement/expression nodes are nested under each function's body. Declaration-like entries such as globals/functions and struct or union members may also include headerComments when a leading comment block is detected. types[].tag / types[].tagToken expose struct/union/enum tag names, and typedefs[] plus tags[] enumerate typedef and tag declarations by scope. For example:

{
  "types": [
    {
      "id": 4,
      "kind": "TY_FUNC",
      "name": "main",
      "returnTypeId": 5,
      "paramTypeIds": [],
      "isVariadic": false
    },
    {
      "id": 5,
      "kind": "TY_INT",
      "size": 4,
      "align": 4,
      "isUnsigned": false,
      "isAtomic": false,
      "originTypeId": null
    }
  ],
  "ast": {
    "kind": "program",
    "globals": [
      {
        "name": "main",
        "typeId": 4,
        "isFunction": true,
        "body": {
          "kind": "ND_BLOCK",
          "body": [
            {
              "kind": "ND_RETURN",
              "lhs": {
                "kind": "ND_NUM",
                "typeId": 5,
                "value": 42
              }
            }
          ]
        }
      }
    ]
  }
}

Token variation

Token	Details
`TK_IDENT`	Identifier token emitted by the tokenizer.
`TK_PUNCT`	Punctuation or operator token such as `(`, `)`, `+`, or `->`.
`TK_KEYWORD`	Reserved language keyword after keyword classification.
`TK_STR`	String literal token with decoded string bytes and a string type.
`TK_NUM`	Numeric token after semantic number parsing.
`TK_PP_NUM`	Preprocessor-number token before final numeric interpretation.
`TK_COMMENT`	Line (`//`) or block (`/* ... */`) comment token.
`TK_EOF`	End-of-file sentinel token appended to every token stream.

AST node variation

Type	Details
`TY_VOID`	The `void` type.
`TY_BOOL`	The `_Bool` type.
`TY_CHAR`	The `char` type.
`TY_SHORT`	The `short` type.
`TY_INT`	The `int` type.
`TY_LONG`	The `long` type.
`TY_FLOAT`	The `float` type.
`TY_DOUBLE`	The `double` type.
`TY_LDOUBLE`	The `long double` type.
`TY_ENUM`	An enum type.
`TY_PTR`	A pointer type with `baseTypeId` pointing to the pointee type.
`TY_FUNC`	A function type with `returnTypeId` and `paramTypeIds`.
`TY_ARRAY`	A fixed-size array type with `baseTypeId` and `arrayLen`.
`TY_VLA`	A variable-length array type.
`TY_STRUCT`	A struct type, including member layout metadata.
`TY_UNION`	A union type, including member layout metadata.

Node	Details
`ND_NULL_EXPR`	A no-op expression placeholder.
`ND_ADD`	Addition expression.
`ND_SUB`	Subtraction expression.
`ND_MUL`	Multiplication expression.
`ND_DIV`	Division expression.
`ND_NEG`	Unary minus expression.
`ND_MOD`	Remainder expression.
`ND_BITAND`	Bitwise AND expression.
`ND_BITOR`	Bitwise OR expression.
`ND_BITXOR`	Bitwise XOR expression.
`ND_SHL`	Left-shift expression.
`ND_SHR`	Right-shift expression.
`ND_EQ`	Equality comparison expression.
`ND_NE`	Inequality comparison expression.
`ND_LT`	Less-than comparison expression.
`ND_LE`	Less-than-or-equal comparison expression.
`ND_ASSIGN`	Assignment expression.
`ND_COND`	Ternary conditional (`?:`) expression.
`ND_COMMA`	Comma operator expression.
`ND_MEMBER`	Struct or union member access.
`ND_ADDR`	Address-of (`&`) expression.
`ND_DEREF`	Pointer dereference (`*`) expression.
`ND_NOT`	Logical NOT expression.
`ND_BITNOT`	Bitwise NOT expression.
`ND_LOGAND`	Logical AND expression with short-circuit semantics.
`ND_LOGOR`	Logical OR expression with short-circuit semantics.
`ND_RETURN`	Return statement.
`ND_IF`	`if` / `else` statement.
`ND_FOR`	`for`-style loop node used for normalized loop forms.
`ND_DO`	`do ... while` loop.
`ND_SWITCH`	`switch` statement.
`ND_CASE`	`case` or `default` label inside a switch.
`ND_BLOCK`	Compound statement containing a `body` list.
`ND_GOTO`	Direct `goto` statement.
`ND_GOTO_EXPR`	Computed goto expression.
`ND_LABEL`	Labeled statement.
`ND_LABEL_VAL`	GNU label-address expression such as `&&label`.
`ND_FUNCALL`	Function call expression.
`ND_EXPR_STMT`	Expression statement.
`ND_STMT_EXPR`	GNU statement-expression (`({ ... })`).
`ND_VAR`	Variable reference expression.
`ND_VLA_PTR`	Internal node that references the storage backing a VLA.
`ND_NUM`	Numeric literal expression.
`ND_CAST`	Cast expression.
`ND_MEMZERO`	Internal zero-fill helper inserted by initialization lowering.
`ND_ASM`	GNU inline assembly statement node.
`ND_CAS`	Atomic compare-and-swap helper node.
`ND_EXCH`	Atomic exchange helper node.

Example: Converting JSON into TypeScript Type Expressions

The emitted JSON can be used as source data for building TypeScript type expressions that mirror the shape of a C struct. This example focuses only on copying member names and member type shapes. It does not try to address exact memory layout compatibility, ABI concerns, padding, alignment, or the other details required for real FFI bindings.

Start with a small C input. If you attach comments to struct members, and also to the declaration that uses the struct, you can later read those comments back as hints.

struct Point {
  /* ffi:i32 */
  int x;
  /* ffi:u16 */
  unsigned short y;
};

/* ffi:type:Point */
struct Point global_point;

When you dump this with --dump-ast, you get JSON roughly like this. The important points are:

The struct itself appears as a TY_STRUCT entry in the types array.
Member enumeration comes from types[*].members.
To find which struct to use, follow ast.globals[*].typeId to types[*].id.

Rather than searching for a specific struct by name directly, it is often easier to first find a declaration that uses that type, such as a global variable or function parameter, and then start from its typeId.

{
  "types": [
    {
      "id": 1,
      "kind": "TY_STRUCT",
      "tag": "Point",
      "members": [
        {
          "name": "x",
          "typeId": 2,
          "headerComments": [
            {
              "style": "block",
              "text": " ffi:i32 "
            }
          ],
          "offset": 0,
          "align": 4,
          "index": 0,
          "isBitfield": false,
          "bitOffset": 0,
          "bitWidth": 0
        },
        {
          "name": "y",
          "typeId": 3,
          "headerComments": [
            {
              "style": "block",
              "text": " ffi:u16 "
            }
          ],
          "offset": 4,
          "align": 2,
          "index": 1,
          "isBitfield": false,
          "bitOffset": 0,
          "bitWidth": 0
        }
      ]
    },
    {
      "id": 2,
      "kind": "TY_INT",
      "isUnsigned": false
    },
    {
      "id": 3,
      "kind": "TY_SHORT",
      "isUnsigned": true
    }
  ],
  "ast": {
    "globals": [
      {
        "name": "global_point",
        "typeId": 1,
        "headerComments": [
          {
            "style": "block",
            "text": " ffi:type:Point "
          }
        ]
      }
    ]
  }
}

The following minimal example reads that JSON and emits TypeScript bindings such as type Point = { ... }. Because typeId is a reference ID rather than an array index, it is safest to build a Map first. You can now also use types[].tag and typedefs[], so a type name or typedef alias can be recovered even when no ffi:type:... comment is present. In the example below, comments are treated as optional extra FFI hints, while the JSON payload itself is the primary source of naming information.

import { dumpJson } from 'chibicc-dumper';

interface DumpHeaderComment {
  readonly text: string;
}

interface DumpMember {
  readonly name: string | null;
  readonly typeId: number;
  readonly headerComments?: readonly DumpHeaderComment[];
}

interface DumpType {
  readonly id: number;
  readonly kind: string;
  readonly tag?: string;
  readonly isUnsigned?: boolean;
  readonly baseTypeId?: number;
  readonly members?: readonly DumpMember[];
}

interface DumpTypedef {
  readonly name: string;
  readonly typeId: number;
}

interface DumpGlobal {
  readonly name: string;
  readonly typeId: number;
  readonly headerComments?: readonly DumpHeaderComment[];
}

interface DumpResult {
  readonly types: readonly DumpType[];
  readonly typedefs?: readonly DumpTypedef[];
  readonly ast?: {
    readonly globals: readonly DumpGlobal[];
  };
}

const scalarKinds = new Set([
  'TY_CHAR',
  'TY_SHORT',
  'TY_INT',
  'TY_LONG',
  'TY_FLOAT',
  'TY_DOUBLE',
  'TY_LDOUBLE',
  'TY_ENUM',
]);

const findFfiAnnotation = (
  comments: readonly DumpHeaderComment[] | undefined
): string | undefined =>
  comments
    ?.map((comment) => comment.text.trim())
    .find((text) => text.startsWith('ffi:'));

const renderStructLiteral = (
  members: readonly DumpMember[],
  typeById: ReadonlyMap<number, DumpType>,
  seen: ReadonlySet<number>
): string => {
  const lines = members.map((member) => {
    if (member.name === null) {
      throw new Error('Anonymous members need custom handling.');
    }

    const annotation = findFfiAnnotation(member.headerComments);
    const annotationLine = annotation ? `  /** ${annotation} */\n` : '';
    return `${annotationLine}  ${member.name}: ${renderType(member.typeId, typeById, seen)};`;
  });

  return `{\n${lines.join('\n')}\n}`;
};

const renderExampleObjectLiteral = (
  members: readonly DumpMember[],
  typeById: ReadonlyMap<number, DumpType>,
  seen: ReadonlySet<number>
): string => {
  const lines = members.map((member) => {
    if (member.name === null) {
      throw new Error('Anonymous members need custom handling.');
    }

    return `  ${member.name}: ${renderExampleValue(member.typeId, typeById, seen)},`;
  });

  return `{\n${lines.join('\n')}\n}`;
};

const renderType = (
  typeId: number,
  typeById: ReadonlyMap<number, DumpType>,
  seen: ReadonlySet<number> = new Set()
): string => {
  const ty = typeById.get(typeId);
  if (!ty) {
    throw new Error(`Unknown typeId: ${typeId}`);
  }

  if (scalarKinds.has(ty.kind)) {
    return 'number';
  }

  switch (ty.kind) {
    case 'TY_BOOL':
      return 'boolean';
    case 'TY_PTR':
      return 'number';
    case 'TY_ARRAY':
      if (ty.baseTypeId === undefined) {
        throw new Error(`TY_ARRAY ${typeId} has no baseTypeId.`);
      }
      return `${renderType(ty.baseTypeId, typeById, seen)}[]`;
    case 'TY_STRUCT':
    case 'TY_UNION':
      if (!ty.members) {
        throw new Error(`${ty.kind} ${typeId} has no members.`);
      }
      if (seen.has(typeId)) {
        return '{ /* recursive */ }';
      }
      return renderStructLiteral(
        ty.members,
        typeById,
        new Set([...seen, typeId])
      );
    default:
      return 'unknown';
  }
};

const renderExampleValue = (
  typeId: number,
  typeById: ReadonlyMap<number, DumpType>,
  seen: ReadonlySet<number> = new Set()
): string => {
  const ty = typeById.get(typeId);
  if (!ty) {
    throw new Error(`Unknown typeId: ${typeId}`);
  }

  if (scalarKinds.has(ty.kind)) {
    return '0';
  }

  switch (ty.kind) {
    case 'TY_BOOL':
      return 'false';
    case 'TY_PTR':
      return '0';
    case 'TY_ARRAY':
      return '[]';
    case 'TY_STRUCT':
    case 'TY_UNION':
      if (!ty.members) {
        throw new Error(`${ty.kind} ${typeId} has no members.`);
      }
      if (seen.has(typeId)) {
        return '{}';
      }
      return renderExampleObjectLiteral(
        ty.members,
        typeById,
        new Set([...seen, typeId])
      );
    default:
      return 'undefined as never';
  }
};

const generatePointBindings = async (): Promise<string> => {
  const dumpText = await dumpJson({
    inputPath: 'point.c',
    source: `
struct Point {
  /* ffi:i32 */
  int x;
  /* ffi:u16 */
  unsigned short y;
};

/* ffi:type:Point */
struct Point global_point;
`.trimStart(),
    dumpTokens: false,
    dumpAst: true,
  });

  const result = JSON.parse(dumpText) as DumpResult;
  const typeById = new Map(result.types.map((ty) => [ty.id, ty]));

  const target = result.ast?.globals.find(
    (global) => global.name === 'global_point'
  );
  if (!target) {
    throw new Error('global_point not found.');
  }

  const targetType = typeById.get(target.typeId);
  if (!targetType) {
    throw new Error(`Unknown target type: ${target.typeId}`);
  }

  const aliasName =
    targetType.tag ??
    result.typedefs?.find((entry) => entry.typeId === target.typeId)?.name ??
    findFfiAnnotation(target.headerComments)?.replace(/^ffi:type:/, '') ??
    'GeneratedType';

  return [
    `type ${aliasName} = ${renderType(target.typeId, typeById)};`,
    `const ${target.name}: ${aliasName} = ${renderExampleValue(target.typeId, typeById)};`,
  ].join('\n\n');
};

console.log(await generatePointBindings());

The output looks like this:

type Point = {
  /** ffi:i32 */
  x: number;
  /** ffi:u16 */
  y: number;
};

const global_point: Point = {
  x: 0,
  y: 0,
};

The key implementation points in this example are:

Identify the struct by starting from a declaration node such as ast.globals, taking its typeId, and resolving that ID in types.
Enumerate members from the members array of a TY_STRUCT or TY_UNION.
Determine each member type by resolving member.typeId in types and checking fields such as kind, isUnsigned, and baseTypeId.
Struct/union/enum tag names are available from types[].tag, and typedef aliases are available from typedefs[]. Comments are optional extra hints, not the only naming source.
If simple scalar coverage is enough, mapping TY_INT and TY_SHORT to number, and TY_BOOL to boolean, is already useful.
If you also want a value-side skeleton, you can reuse the same type walk to generate defaults such as 0, false, [], and { ... }, which is enough to emit const global_point: Point = { ... }.
Nested structs can be handled by recursively following TY_STRUCT / TY_UNION. If you want separate named type aliases, add a naming rule for recursive expansion.
Pointers appear as TY_PTR. If you only want to mirror JSON shape, you can map them to number or a custom alias such as Pointer<T>, but real FFI use needs additional design.
Fixed-size arrays can be converted from TY_ARRAY plus baseTypeId and arrayLen into T[] or tuple-like forms.
Comments can be read back from headerComments on globals/functions and struct/union members. Strings such as ffi:type:Point or ffi:u16 can serve as future hints for FFI conversion or other custom annotations.

License

Under MIT.

About original chibicc

Read the original README for chibicc.

Name		Name	Last commit message	Last commit date
chibicc		chibicc
include		include
scripts		scripts
src		src
test		test
tests		tests
.gitignore		.gitignore
.prettierignore		.prettierignore
.prettierrc		.prettierrc
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README_ja.md		README_ja.md
build_pack.sh		build_pack.sh
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json
tsconfig.tests.json		tsconfig.tests.json
vite.config.ts		vite.config.ts
vitest.config.ts		vitest.config.ts

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chibicc-dumper

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Clang can generate an AST

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chibicc-dumper

What is this?

Clang can generate an AST

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CLI

Examples

TypeScript / JavaScript NPM package

JSON structure

Token variation

AST node variation

Example: Converting JSON into TypeScript Type Expressions

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