useCounter.js - mozsearch

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load(libdir + "asm.js");

let useCounters = getUseCounterResults();

// No asm.js modules will have been instantiated yet.

assertEq(useCounters.AsmJS, 0);

// We will have seen one "use asm" for `valid` when this script has been parsed.

assertEq(useCounters.UseAsm, 1);

// No wasm is being used.

assertEq(useCounters.Wasm, 0);

// Do an imperative asm.js compilation.

asmLink(asmCompile(

  USE_ASM +

  "function f(i) { i=i|0; return (i*2)|0 } return f"

));

// Do an imperative asm.js compilation that is invalid.

Function.apply(null, [USE_ASM+"function f(){i=i|0} function g() { f(0) } return g"]);

// Define an asm.js function normally as part of this script.

function valid() {

  "use asm";

  function f(i) { i=i|0; return (i*2)|0 } return f;

let f = valid();

assertEq(f(0), 0);

assertEq(f(1), 2);

useCounters = getUseCounterResults();

// If asm.js is enabled, then we have instantiated two valid modules.

assertEq(useCounters.AsmJS, isAsmJSCompilationAvailable() ? 2 : 0);

// Even if asm.js is not enabled, we have seen three "use asm" directives.

assertEq(useCounters.UseAsm, 3);

// No wasm is being used.

assertEq(useCounters.Wasm, 0);