[modules] Add partial support for debug-scopes.

test/mjsunit/modules-debug-scopes2.js

+// Copyright 2016 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.
+
+// MODULE
+// Flags: --expose-debug-as debug
+
+
+var Debug = debug.Debug;
+
+var test_name;
+var listener_delegate;
+var listener_called;
+var exception;
+var begin_test_count = 0;
+var end_test_count = 0;
+var break_count = 0;
+
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      break_count++;
+      listener_called = true;
+      listener_delegate(exec_state);
+    }
+  } catch (e) {
+    exception = e;
+  }
+}
+
+Debug.setListener(listener);
+
+
+function BeginTest(name) {
+  test_name = name;
+  listener_delegate = null;
+  listener_called = false;
+  exception = null;
+  begin_test_count++;
+}
+
+function EndTest() {
+  assertTrue(listener_called, "listener not called for " + test_name);
+  assertNull(exception, test_name + " / " + exception);
+  end_test_count++;
+}
+
+
+// Check that two scope are the same.
+function assertScopeMirrorEquals(scope1, scope2) {
+  assertEquals(scope1.scopeType(), scope2.scopeType());
+  assertEquals(scope1.frameIndex(), scope2.frameIndex());
+  assertEquals(scope1.scopeIndex(), scope2.scopeIndex());
+  assertPropertiesEqual(scope1.scopeObject().value(), scope2.scopeObject().value());

[adamk, 2016/10/24 10:52:18]

Over 80 characters here and various places below. We should really be using
clang-format on our JS, but I'm guessing that's harder to set up than it should
be.

+}
+
+function CheckFastAllScopes(scopes, exec_state)
+{
+  var fast_all_scopes = exec_state.frame().allScopes(true);
+  var length = fast_all_scopes.length;
+  assertTrue(scopes.length >= length);
+  for (var i = 0; i < scopes.length && i < length; i++) {
+    var scope = fast_all_scopes[length - i - 1];
+    assertTrue(scope.isScope());
+    assertEquals(scopes[scopes.length - i - 1], scope.scopeType());
+  }
+}
+
+
+// Check that the scope chain contains the expected types of scopes.
+function CheckScopeChain(scopes, exec_state) {
+  var all_scopes = exec_state.frame().allScopes();
+  assertEquals(scopes.length, exec_state.frame().scopeCount());
+  assertEquals(scopes.length, all_scopes.length, "FrameMirror.allScopes length");
+  for (var i = 0; i < scopes.length; i++) {
+    var scope = exec_state.frame().scope(i);
+    assertTrue(scope.isScope());
+    assertEquals(scopes[i], scope.scopeType());
+    assertScopeMirrorEquals(all_scopes[i], scope);
+  }
+  CheckFastAllScopes(scopes, exec_state);
+
+  // Get the debug command processor.
+  var dcp = exec_state.debugCommandProcessor("unspecified_running_state");
+
+  // Send a scopes request and check the result.
+  var json;
+  var request_json = '{"seq":0,"type":"request","command":"scopes"}';
+  var response_json = dcp.processDebugJSONRequest(request_json);
+  var response = JSON.parse(response_json);
+  assertEquals(scopes.length, response.body.scopes.length);
+  for (var i = 0; i < scopes.length; i++) {
+    assertEquals(i, response.body.scopes[i].index);
+    assertEquals(scopes[i], response.body.scopes[i].type);
+    if (scopes[i] == debug.ScopeType.Local ||
+        scopes[i] == debug.ScopeType.Script ||
+        scopes[i] == debug.ScopeType.Closure) {
+      assertTrue(response.body.scopes[i].object.ref < 0);
+    } else {
+      assertTrue(response.body.scopes[i].object.ref >= 0);
+    }
+    var found = false;
+    for (var j = 0; j < response.refs.length && !found; j++) {
+      found = response.refs[j].handle == response.body.scopes[i].object.ref;
+    }
+    assertTrue(found, "Scope object " + response.body.scopes[i].object.ref + " not found");
+  }
+}
+
+
+function CheckScopeDoesNotHave(properties, number, exec_state) {
+  var scope = exec_state.frame().scope(number);
+  for (var p of properties) {
+    var property_mirror = scope.scopeObject().property(p);
+    assertTrue(property_mirror.isUndefined(), 'property ' + p + ' found in scope');
+  }
+}
+
+
+// Check that the scope contains at least minimum_content. For functions just
+// check that there is a function.
+function CheckScopeContent(minimum_content, number, exec_state) {
+  var scope = exec_state.frame().scope(number);
+  var minimum_count = 0;
+  for (var p in minimum_content) {
+    var property_mirror = scope.scopeObject().property(p);
+    assertFalse(property_mirror.isUndefined(), 'property ' + p + ' not found in scope');
+    if (typeof(minimum_content[p]) === 'function') {
+      assertTrue(property_mirror.value().isFunction());
+    } else {
+      assertEquals(minimum_content[p], property_mirror.value().value(), 'property ' + p + ' has unexpected value');
+    }
+    minimum_count++;
+  }
+
+  // 'arguments' and might be exposed in the local and closure scope. Just
+  // ignore this.
+  var scope_size = scope.scopeObject().properties().length;
+  if (!scope.scopeObject().property('arguments').isUndefined()) {
+    scope_size--;
+  }
+  // Ditto for 'this'.
+  if (!scope.scopeObject().property('this').isUndefined()) {
+    scope_size--;
+  }
+  // Temporary variables introduced by the parser have not been materialized.
+  assertTrue(scope.scopeObject().property('').isUndefined());
+
+  if (scope_size < minimum_count) {
+    print('Names found in scope:');
+    var names = scope.scopeObject().propertyNames();
+    for (var i = 0; i < names.length; i++) {
+      print(names[i]);
+    }
+  }
+  assertTrue(scope_size >= minimum_count);
+
+  // Get the debug command processor.
+  var dcp = exec_state.debugCommandProcessor("unspecified_running_state");
+
+  // Send a scope request for information on a single scope and check the
+  // result.
+  var request_json = '{"seq":0,"type":"request","command":"scope","arguments":{"number":';
+  request_json += scope.scopeIndex();
+  request_json += '}}';
+  var response_json = dcp.processDebugJSONRequest(request_json);
+  var response = JSON.parse(response_json);
+  assertEquals(scope.scopeType(), response.body.type);
+  assertEquals(number, response.body.index);
+  if (scope.scopeType() == debug.ScopeType.Local ||
+      scope.scopeType() == debug.ScopeType.Script ||
+      scope.scopeType() == debug.ScopeType.Closure) {
+    assertTrue(response.body.object.ref < 0);
+  } else {
+    assertTrue(response.body.object.ref >= 0);
+  }
+  var found = false;
+  for (var i = 0; i < response.refs.length && !found; i++) {
+    found = response.refs[i].handle == response.body.object.ref;
+  }
+  assertTrue(found, "Scope object " + response.body.object.ref + " not found");
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Actual tests.

[adamk, 2016/10/24 10:52:18]

Can you also add a test with an export and an import in tdz?

[adamk, 2016/10/24 10:58:20]

As neis kindly points out, the test immediately below this is testing this
behavior.

+////////////////////////////////////////////////////////////////////////////////
+
+
+BeginTest();
+listener_delegate = function(exec_state) {
+  CheckScopeChain([debug.ScopeType.Module,
+                   debug.ScopeType.Script,
+                   debug.ScopeType.Global], exec_state);
+  CheckScopeContent(
+      {local_var: undefined, exported_var: undefined, imported_var: undefined},
+      0, exec_state);
+  CheckScopeDoesNotHave(
+      ["doesnotexist", "local_let", "exported_let", "imported_let"],
+      0, exec_state);
+};
+debugger;
+EndTest();
+
+let local_let = 1;
+var local_var = 2;
+export let exported_let = 3;
+export var exported_var = 4;
+import {exported_let as imported_let} from "modules-debug-scopes2.js";
+import {exported_var as imported_var} from "modules-debug-scopes2.js";
+
+BeginTest();
+listener_delegate = function(exec_state) {
+  CheckScopeChain([debug.ScopeType.Module,
+                   debug.ScopeType.Script,
+                   debug.ScopeType.Global], exec_state);
+  CheckScopeContent(
+      {local_let: 1, local_var: 2, exported_let: 3, exported_var: 4,
+       imported_let: 3, imported_var: 4}, 0, exec_state);
+};
+debugger;
+EndTest();
+
+local_let += 10;
+local_var += 10;
+exported_let += 10;
+exported_var += 10;
+
+BeginTest();
+listener_delegate = function(exec_state) {
+  CheckScopeChain([debug.ScopeType.Module,
+                   debug.ScopeType.Script,
+                   debug.ScopeType.Global], exec_state);
+  CheckScopeContent(
+      {local_let: 11, local_var: 12, exported_let: 13, exported_var: 14,
+       imported_let: 13, imported_var: 14}, 0, exec_state);
+};
+debugger;
+EndTest();