profiler-cont-base-frame.js

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// |jit-test| skip-if: !wasmStackSwitchingEnabled() || WasmHelpers.isSingleStepProfilingEnabled

// Sampling the Gecko profiler while a stack-switching continuation's entry

// function is the innermost wasm frame must not crash. When an interrupt fires

// in the entry function, JitActivation::wasmExitFP points at a frame whose

// return address lands in the ContBaseFrame stub, so

// ProfilingFrameIterator::initFromExitFP has to transition off the continuation

// stack rather than hitting MOZ_CRASH("Unexpected CodeRange kind").

//

// The loop count makes a single resume outlast the timeout, so the interrupt

// reliably fires while the entry function is the innermost frame. That count is

// far too large to simulate, so this variant is skipped on single-step

// (simulator) builds; profiler-cont-base-frame-singlestep.js covers those.

enableGeckoProfiling();

let sampled = false;

setInterruptCallback(function () {

  // The activation has exited wasm to run this handler, so wasmExitFP points at

  // the continuation entry frame: this samples through initFromExitFP.

  readGeckoProfilingStack();

  sampled = true;

  return true;

});

let ins = wasmEvalText(`(module

  (type $ft (func))

  (type $ct (cont $ft))

  (func $f (type $ft)

    (local $i i32)

    (loop $l

      (local.set $i (i32.add (local.get $i) (i32.const 1)))

      (br_if $l (i32.lt_u (local.get $i) (i32.const 1000000000)))))

  (elem declare func $f)

  (func (export "run") ref.func $f cont.new $ct resume $ct)

)`, {});

// Keep resuming the continuation until the interrupt handler has run while its

// entry function was the innermost wasm frame.

timeout(0.1);

while (!sampled) {

  ins.exports.run();