[parser/test] Move cctest/PreParserScopeAnalysis into a new file.

test/cctest/scope-test-helper.h

+// Copyright 2017 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.
+
+#ifndef V8_CCTEST_SCOPE_TEST_HELPER_H_
+#define V8_CCTEST_SCOPE_TEST_HELPER_H_
+
+#include "src/ast/scopes.h"
+#include "src/ast/variables.h"
+
+namespace v8 {
+namespace internal {
+
+class ScopeTestHelper {
+ public:
+  static bool MustAllocateInContext(Variable* var) {
+    return var->scope()->MustAllocateInContext(var);
+  }
+
+  // True if the scope is and its entire subscope tree are hidden.
+  static bool ScopeTreeIsHidden(Scope* scope) {
+    if (!scope->is_hidden()) {
+      return false;
+    }
+    for (Scope* inner = scope->inner_scope(); inner != nullptr;
+         inner = inner->sibling()) {
+      if (!ScopeTreeIsHidden(inner)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  static void CompareScopeToData(Scope* scope, const PreParsedScopeData* data,
+                                 size_t& index) {
+    CHECK_EQ(data->backing_store_[index++], scope->scope_type());
+    CHECK_EQ(data->backing_store_[index++], scope->start_position());
+    CHECK_EQ(data->backing_store_[index++], scope->end_position());
+
+    int inner_scope_count = 0;
+    for (Scope* inner = scope->inner_scope(); inner != nullptr;
+         inner = inner->sibling()) {
+      // FIXME(marja): This is probably not the right condition for knowing what
+      // scopes are present in the preparse data.
+      if (!ScopeTreeIsHidden(inner)) {
+        ++inner_scope_count;
+      }
+    }
+    CHECK_EQ(data->backing_store_[index++], inner_scope_count);
+
+    int variable_count = 0;
+    for (Variable* local : scope->locals_) {
+      if (local->mode() == VAR || local->mode() == LET ||
+          local->mode() == CONST) {
+        ++variable_count;
+      }
+    }
+
+    CHECK_EQ(data->backing_store_[index++], variable_count);
+
+    for (Variable* local : scope->locals_) {
+      if (local->mode() == VAR || local->mode() == LET ||
+          local->mode() == CONST) {
+#ifdef DEBUG
+        const AstRawString* local_name = local->raw_name();
+        int name_length = data->backing_store_[index++];
+        CHECK_EQ(name_length, local_name->length());
+        for (int i = 0; i < name_length; ++i) {
+          CHECK_EQ(data->backing_store_[index++], local_name->raw_data()[i]);
+        }
+#endif
+        CHECK_EQ(data->backing_store_[index++], local->location());
+        CHECK_EQ(data->backing_store_[index++], local->maybe_assigned());
+      }
+    }
+
+    for (Scope* inner = scope->inner_scope(); inner != nullptr;
+         inner = inner->sibling()) {
+      if (!ScopeTreeIsHidden(inner)) {
+        CompareScopeToData(inner, data, index);
+      }
+    }
+  }
+};
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CCTEST_SCOPE_TEST_HELPER_H_