v8/test/mjsunit/compiler/concurrent-invalidate-transition-map.js

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// Flags: --track-fields --track-double-fields --allow-natives-syntax
// Flags: --concurrent-recompilation --block-concurrent-recompilation
// Flags: --no-always-opt --no-turbo-concurrent-get-property-access-info

if (!%IsConcurrentRecompilationSupported()) {
  print("Concurrent recompilation is disabled. Skipping this test.");
  quit();
}

function new_object() {
  var o = {};
  o.a = 1;
  o.b = 2;
  return o;
}

function add_field(obj) {
  // Assign twice to make the field non-constant.
  obj.c = 0;
  obj.c = 3;
}
%PrepareFunctionForOptimization(add_field);
var obj1 = new_object();
var obj2 = new_object();
add_field(obj1);
add_field(obj2);
%OptimizeFunctionOnNextCall(add_field, "concurrent");

var o = new_object();
// Kick off recompilation.
add_field(o);
// Invalidate transition map after compile graph has been created.
o.c = 2.2;
// In the mean time, concurrent recompiling is still blocked.
assertUnoptimized(add_field, "no sync");
// Let concurrent recompilation proceed.
%UnblockConcurrentRecompilation();
// Sync with background thread to conclude optimization that bailed out.
if (!%IsDictPropertyConstTrackingEnabled()) {
  // TODO(v8:11457) Currently, we cannot inline property stores if there is a
  // dictionary mode prototype on the prototype chain. Therefore, if
  // v8_dict_property_const_tracking is enabled, the optimized code only
  // contains a call to the IC handler and doesn't get invalidated when the
  // transition map changes.
  assertUnoptimized(add_field, "sync");
}
// Clear type info for stress runs.
%ClearFunctionFeedback(add_field);