backtrace.js - mozsearch

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var code = `(module

  (import "env" "test" (func $i))

  (func $t (call $i))

  (export "test" (func $t))

)`;

var mod = wasmEvalText(code, {

  env: {

    test: function() {

       // Expecting 3 lines in the backtrace (plus last empty).

       // The middle one is for the wasm function.

       var s = getBacktrace();

       var frames = s.split('\n');

       assertEq(frames.length, 4);

       assertEq(/> WebAssembly.Module":wasm-function\[1\]:0x/.test(frames[1]), true);

       // Let's also run DumpBacktrace() to check if we are not crashing.

       backtrace();

}).exports;

mod.test();