v8/test/mjsunit/regress/regress-prepare-break-while-recompile.js

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// Flags: --expose-debug-as debug --allow-natives-syntax
// Flags: --block-concurrent-recompilation

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

Debug = debug.Debug

function foo() {
  var x = 1;
  return x;
}

function bar() {
  var x = 2;
  return x;
}

foo();
// Mark and kick off recompilation.
%OptimizeFunctionOnNextCall(foo, "concurrent");
foo();

// Set break points on an unrelated function. This clears both optimized
// and (shared) unoptimized code on foo, and sets both to lazy-compile builtin.
// Clear the break point immediately after to deactivate the debugger.
// Do all of this after compile graph has been created.
Debug.setBreakPoint(bar, 0, 0);
Debug.clearAllBreakPoints();

// At this point, concurrent recompilation is still blocked.
assertUnoptimized(foo, "no sync");
// Let concurrent recompilation proceed.
%UnblockConcurrentRecompilation();

// Install optimized code when concurrent optimization finishes.
// This needs to be able to deal with shared code being a builtin.
assertUnoptimized(foo, "sync");