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function getStack() {
enableGeckoProfiling();
let stack = readGeckoProfilingStack();
// The number of frames depends on JIT flags, but there must be at least
// one frame for the caller and at most 3 total (the global script, 'testFun'
// and 'getStack').
assertEq(stack.length > 0, true);
assertEq(stack.length <= 3, true);
assertEq(JSON.stringify(stack).includes('"testFun ('), true);
disableGeckoProfiling();
}
function testFun() {
// Loop until this is a JIT frame.
while (true) {
let isJitFrame = inJit();
if (typeof isJitFrame === "string") {
return; // JIT disabled.
}
if (isJitFrame) {
break;
}
}
// Now call getStack to check this frame is on the profiler's JIT stack.
getStack();
getStack();
}
testFun();