LiveEdit: patch positions in function

test/mjsunit/debug-liveedit-patch-positions.js

+// Copyright 2010 the V8 project authors. All rights reserved.
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+// modification, are permitted provided that the following conditions are
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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.
+
+// Scenario: some function is being edited; the outer function has to have its
+// positions patched. Accoring to a special markup of function text
+// corresponding byte-code PCs should conicide before change and after it.
+
+Debug = debug.Debug
+
+eval(
+    "function F1() {  return 5; }\n" +
+    "function ChooseAnimal(/*$*/ ) {\n" +
+    "/*$*/ var x = F1(/*$*/ );\n" +
+    "/*$*/ var res/*$*/  =/*$*/ (function() { return 'Cat'; } )();\n" +
+    "/*$*/ var y/*$*/  = F2(/*$*/ F1()/*$*/ , F1(/*$*/ )/*$*/ );\n" +
+    "/*$*/ if (/*$*/ x.toString(/*$*/ )) { /*$*/ y = 3;/*$*/  } else {/*$*/  y = 8;/*$*/  }\n" +
+    "/*$*/ var z = /*$*/ x * y;\n" +
+    "/*$*/ return/*$*/  res/*$*/  + z;/*$*/  }\n" +
+    "function F2(x, y) { return x + y; }"
+);
+
+// Find all *$* markers in text of the function and read corresponding statement
+// PCs.
+function ReadMarkerPositions(func) {
+  var text = func.toString();
+  var positions = new Array();
+  var match;
+  var pattern = /\/\*\$\*\//g;
+  while ((match = pattern.exec(text)) != null) {
+    positions.push(match.index);
+  }
+  return positions;
+}
+
+function ReadPCMap(func, positions) {
+  var res = new Array();
+  for (var i = 0; i < positions.length; i++) {
+    res.push(Debug.LiveEditChangeScript.GetPcFromSourcePos(func, positions[i]));
+  }
+  return res;
+}
+
+var res = ChooseAnimal();
+assertEquals("Cat15", res);
+
+var markerPositionsBefore = ReadMarkerPositions(ChooseAnimal);
+var pcArrayBefore = ReadPCMap(ChooseAnimal, markerPositionsBefore);
+
+var script = Debug.findScript(ChooseAnimal);
+
+var orig_animal = "'Cat'";
+var patch_pos = script.source.indexOf(orig_animal);
+var new_animal_patch = "'Capybara'";
+
+var change_log = new Array();
+Debug.LiveEditChangeScript(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
+print("Change log: " + JSON.stringify(change_log) + "\n");
+
+var res = ChooseAnimal();
+assertEquals("Capybara15", res);
+
+var markerPositionsAfter = ReadMarkerPositions(ChooseAnimal);
+var pcArrayAfter = ReadPCMap(ChooseAnimal, markerPositionsAfter);
+
+assertArrayEquals(pcArrayBefore, pcArrayAfter);
+