Support for precise stepping in functions compiled before debugging was started (step 2)

test/mjsunit/debug-step-3.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
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+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
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+//       with the distribution.
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+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
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+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+
+// This test tests that full code compiled without debug break slots
+// is recompiled with debug break slots when debugging is started.
+
+// Get the Debug object exposed from the debug context global object.
+Debug = debug.Debug
+
+var bp;
+var done = false;
+var step_count = 0;
+var set_bp = false
+
+// Debug event listener which steps until the global variable done is true.
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.Break) {
+    if (!done) exec_state.prepareStep(Debug.StepAction.StepNext);
+    step_count++;
+  }
+};
+
+// Set the global variables state to prpare the stepping test.
+function prepare_step_test() {
+  done = false;
+  step_count = 0;
+}
+
+// Test function to step through.
+function f() {
+  var a = 0;
+  if (set_bp) { bp = Debug.setBreakPoint(f, 3); }
+  var i = 1;
+  var j = 2;
+  done = true;
+};
+
+prepare_step_test();
+f();
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+// Make f set a breakpoint with an activation on the stack.
+prepare_step_test();
+set_bp = true;
+f();
+assertEquals(4, step_count);
+Debug.clearBreakPoint(bp);
+
+// Set a breakpoint on the first var statement (line 1).
+set_bp = false;
+bp = Debug.setBreakPoint(f, 3);
+
+// Step through the function ensuring that the var statements are hit as well.
+prepare_step_test();
+f();
+assertEquals(4, step_count);
+
+// Clear the breakpoint and check that no stepping happens.
+Debug.clearBreakPoint(bp);
+prepare_step_test();
+f();
+assertEquals(0, step_count);
+
+// Get rid of the debug event listener.
+Debug.setListener(null);