Debugger: prepare code for debugging on a per-function basis.

test/mjsunit/debug-optimize.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug --allow-natives-syntax --use-inlining
+
+var Debug = debug.Debug;
+
+function f1() {
+  return 1;
+}
+
+function f2() {
+  return 2;
+}
+
+function f3() {
+  return f1();
+}
+
+function f4() {
+  return 4;
+}
+
+
+function optimize(f) {
+  f();
+  f();
+  %OptimizeFunctionOnNextCall(f);
+  f();
+}
+
+optimize(f1);
+optimize(f2);
+optimize(f3);
+
+Debug.setListener(function() {});
+
+assertOptimized(f1);
+assertOptimized(f2);
+assertOptimized(f3);
+
+Debug.setBreakPoint(f1, 1);
+
+// Setting break point deoptimizes f1 and f3 (which inlines f1).
+assertUnoptimized(f1);
+assertOptimized(f2);
+assertUnoptimized(f3);
+
+// We can optimize with break points set.
+optimize(f4);
+assertOptimized(f4);
+
+Debug.setListener(null);