debug-onStep-suspended.js

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// |jit-test| skip-if: !wasmJSPromiseIntegrationEnabled()

// Setting onStep on wasm frames suspended via JSPI must not crash.

// Verifies event counts across a 3-deep call chain: outer -> middle -> inner -> (suspending import).

var g = newGlobal({newCompartment: true});

var dbg = new Debugger(g);

var enterCount = 0, stepCount = 0, popCount = 0;

var frames = [];

dbg.onEnterFrame = function(f) {

  if (f.type !== "wasmcall") return;

  enterCount++;

  frames.push(f);

  f.onPop = function() { popCount++; };

};

g.eval(`

  var bin = wasmTextToBinary(\`

    (module

      (import "" "susp" (func $susp))

      (func $inner (call $susp))

      (func $middle (call $inner))

      (func $outer (export "outer") (call $middle))

  \`);

  var resolver;

  var susp = new WebAssembly.Suspending(() => new Promise(r => { resolver = r; }));

  var inst = new WebAssembly.Instance(new WebAssembly.Module(bin), {"":{susp: susp}});

  var pf = WebAssembly.promising(inst.exports.outer);

  pf();

`);

// All 3 wasm frames entered before the suspension.

assertEq(enterCount, 3);

assertEq(frames.length, 3);

// Set onStep on each suspended frame. Since step mode is not enabled (no

// stepper counter was incremented), these handlers will never fire.

for (var f of frames) {

  f.onStep = function() { stepCount++; };

g.eval(`resolver();`);

drainJobQueue();

// onStep fires once per function as each resumes and returns.

assertEq(stepCount, 3);

// onPop fires once per frame as each returns after resumption.

assertEq(popCount, 3);

// No additional enter events on resumption (frames resume, not re-enter).

assertEq(enterCount, 3);