tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Object-createSource-forceEnableAsmJS.js (3168B)

      1 // |jit-test| --asmjs; skip-if: !wasmDebuggingEnabled()
      2 
      3 gczeal(0);
      4 
      5 const text = `
      6 function normalFunction() {
      7 }
      8 function asmJSModule(stdlib, foreign) {
      9  "use asm";
     10  function asmJSFunction(x, y) {
     11    x = x|0;
     12    y = y|0;
     13    return (x + y)|0;
     14  }
     15  return asmJSFunction;
     16 }
     17 `;
     18 
     19 // Test the recompilation scenario.
     20 for (const forceEnableAsmJS of [false, true]) {
     21  const g = newGlobal({ newCompartment: true });
     22 
     23  g.evaluate(text, {
     24    fileName: "test.js",
     25  });
     26 
     27  const asmJSFunction = g.asmJSModule(globalThis, null);
     28  assertEq(asmJSFunction(2, 3), 5);
     29 
     30  const dbg = Debugger();
     31  const gdbg = dbg.addDebuggee(g);
     32 
     33  gc();
     34 
     35  // The top-level script should be GC-ed.
     36  const topLevelScriptObject = dbg.findScripts().find(
     37    s => s.format == "js" && !s.isFunction);
     38  assertEq(topLevelScriptObject, undefined);
     39 
     40  // asmJSModule should be seen as WasmInstanceObject.
     41  const asmJSModuleObject = dbg.findScripts().find(
     42    s => s.format == "wasm");
     43  assertEq(!!asmJSModuleObject, true);
     44 
     45  const source = gdbg.createSource({
     46    text,
     47    url: "test.js",
     48    startLine: 1,
     49    forceEnableAsmJS,
     50  });
     51 
     52  const asmJSModuleJSObject = dbg.findScripts().find(
     53    s => s.format == "js" && s.displayName == "asmJSModule");
     54  if (forceEnableAsmJS) {
     55    // If asm.js is force-enabled, createSource should enable the asm.js feature
     56    // and the asmJSModule function should be compiled as a asm.js module again,
     57    // and there shouldn't be BaseScript.
     58    assertEq(asmJSModuleJSObject, undefined);
     59  } else {
     60    // If asm.js is not force-enabled, createSource should disable the asm.js
     61    // feature, and the asmJSModule function should be compiled BaseScript.
     62    assertEq(!!asmJSModuleJSObject, true);
     63  }
     64 }
     65 
     66 // Test the initial compilation scenario.
     67 for (const forceEnableAsmJS of [false, true]) {
     68  const g = newGlobal({ newCompartment: true });
     69 
     70  const dbg = Debugger();
     71  const gdbg = dbg.addDebuggee(g);
     72 
     73  const source = gdbg.createSource({
     74    text,
     75    url: "test.js",
     76    startLine: 1,
     77    forceEnableAsmJS,
     78  });
     79 
     80  const asmJSModuleJSObject = dbg.findScripts().find(
     81    s => s.format == "js" && s.displayName == "asmJSModule");
     82  if (forceEnableAsmJS) {
     83    // If asm.js is force-enabled, createSource should enable the asm.js feature
     84    // and the asmJSModule function should be compiled as a asm.js module, and
     85    // there shouldn't be BaseScript.
     86    assertEq(asmJSModuleJSObject, undefined);
     87  } else {
     88    // If asm.js is not force-enabled, createSource should disable the asm.js
     89    // feature, and the asmJSModule function should be compiled BaseScript.
     90    //
     91    // The asmJSModule script is not strongly held by anything, and it can be
     92    // GCed at this point, depending on the GC timing.
     93    //
     94    // assertEq(!!asmJSModuleJSObject, true);
     95  }
     96 
     97  // If asm.js is not force-enabled, there shouldn't be WasmInstanceObject.
     98  //
     99  // Even if asm.js is force-enabled, the WasmInstanceObject is created only
    100  // when the asmJSModule function is called, and there shouldn't be
    101  // WasmInstanceObject yet.
    102  const asmJSModuleObject = dbg.findScripts().find(
    103    s => s.format == "wasm");
    104  assertEq(asmJSModuleObject, undefined);
    105 }