[debugger] Various break-related functionality in test wrapper

test/mjsunit/debug-step.js

-// Copyright 2008 the V8 project authors. All rights reserved.
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-// modification, are permitted provided that the following conditions are
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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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-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
-Debug = debug.Debug
-
-// Simple debug event handler which first time hit will perform 1000 steps and
-// second time hit will evaluate and store the value of "i". If requires that
-// the global property "state" is initially zero.
-
-var bp1, bp2;
-
-function listener(event, exec_state, event_data, data) {
-  if (event == Debug.DebugEvent.Break) {
-    if (step_count > 0) {
-      exec_state.prepareStep(Debug.StepAction.StepIn);
-      step_count--;
-    } else {
-      result = exec_state.frame().evaluate("i").value();
-      // Clear the break point on line 2 if set.
-      if (bp2) {
-        Debug.clearBreakPoint(bp2);
-      }
-    }
-  }
-};
-
-// Add the debug event listener.
-Debug.setListener(listener);
-
-// Test debug event for break point.
-function f() {
-  var i;                        // Line 1.
-  for (i = 0; i < 1000; i++) {  // Line 2.
-    x = 1;                      // Line 3.
-  }
-};
-
-// Set a breakpoint on the for statement (line 1).
-bp1 = Debug.setBreakPoint(f, 1);
-
-// Check that performing 1000 steps will make i 333.
-var step_count = 1000;
-result = -1;
-f();
-assertEquals(333, result);
-Debug.setListener(null);