decode-off-thread.js

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// |jit-test| skip-if: helperThreadCount() === 0

function evalWithCacheLoadOffThread(code, ctx) {

  ctx = ctx || {};

  ctx = Object.create(ctx, {

    fileName: { value: "evalWithCacheCode.js" },

    lineNumber: { value: 0 }

});

  code = code instanceof Object ? code : cacheEntry(code);

  // We create a new global ...

  if (!("global" in ctx))

    ctx.global = newGlobal();

  var ctx_save = Object.create(ctx, {

    saveIncrementalBytecode: { value: true }

});

  ctx.global.generation = 0;

  evaluate(code, ctx_save);

  offThreadDecodeStencil(code, ctx);

  ctx.global.eval(`

stencil = finishOffThreadStencil();

evalStencil(stencil);

`);

var test;

// Decode a constant.

test = `

1;

`;

evalWithCacheLoadOffThread(test, {});

// Decode object literals.

test = `

  var obj = { a: 1, b: 2 };

  obj.a++;

  assertEq(obj.a, 2);

`;

evalWithCacheLoadOffThread(test, {});

// Decode functions.

test = `

  function g() {

    return function f() { return 1; };

};

  assertEq(g()(), 1);

`;

evalWithCacheLoadOffThread(test, {});