kripken

kripken

import json
import re
import sys

def tokenize(s_expr):
    """
    Extracts tokens from an S-expression string.
    Matches:
      1. Strings enclosed in double quotes (handling escaped characters)
      2. Parentheses '(' and ')'

kripken

(module
 (rec
  (type $0 (sub (struct)))
  (type $2 (sub $0 (struct)))
  (type $1 (sub $0 (struct)))
  (type $4 (sub final $0 (struct)))
  (type $5 (sub final $2 (struct)))
  (type $6 (sub final $0 (struct)))
  (type $7 (sub final $1 (struct)))
  (type $8 (sub final $1 (struct)))

kripken

;; $ bin/wasm-opt a.wat -all --closed-world --signature-pruning --roundtrip
;; [parse exception: incompatible continuation types in cont.bind: source type (type $cont.0 (cont $func.0)) has fewer parameters than target (type $cont.0 (cont $func.0)) (at 0:75)]
;; Fatal: error in parsing wasm binary

(module
 (rec
  (type $0 (sub (struct)))
  (type $1 (func (param (ref null $0)) (result (ref null $0))))
  (type $2 (func (param (ref null $0) (ref null $0) (ref null $0)) (result (ref null $0))))
  (type $3 (cont $1))

kripken

# 1 "//Dev/emscripten/test/other/test_std_filesystem.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 445 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "//Dev/emscripten/test/other/test_std_filesystem.cpp" 2
# 1 "//Dev/emscripten/cache/sysroot/include/c++/v1/cstdint" 1 3
# 146 "//Dev/emscripten/cache/sysroot/include/c++/v1/cstdint" 3
# 1 "//Dev/emscripten/cache/sysroot/include/c++/v1/__config" 1 3

kripken

def matrix_math(matrix, offset, vector):
    '''
    Computes

        matrix*vector + offset

    Matrix is mxn, vector ix 1xn, offset is 1xn
    '''
    m = len(matrix)

kripken

Wasm host GC integration demo

This lets code compiled to linear memory wasm (like a C++ or Rust game engine) use the host GC instead of shipping its own, with the benefits of

• Not shipping a GC.
• Not needing to manage a shadow stack in userspace.
• Other host GC benefits, like existing optimzations there, integration with system memory pressure events, etc.

kripken

--- a	2025-10-08 13:06:30.544955211 -0700
+++ b	2025-10-08 13:06:48.673083467 -0700
@@ -1290924,24 +1290924,21 @@
         (i32.const 36)
        )
       )
      )
     )
    )
    (return

kripken

//
// Branch hints benchmark: 30% faster with the right hint (LIKELY=0),
// 20% slower with the wrong one (LIKELY=1), compared to no hint.
//

#include <iostream>
#include <vector>

#ifdef LIKELY
#define hint(x) __builtin_expect((x), LIKELY)

kripken

var data = new ArrayBuffer(1024);
HEAP8 = new Int8Array(data);
HEAP32 = new Int32Array(data);

for (var i = 0; i < 1024; i++) {
  HEAP8[i] = (i & 17);
}

for (var n = 0; n < 1024 * 500; n++) {