1 files changed, 51 insertions, 0 deletions
diff --git a/deps/v8/tools/debug_helper/heap-constants.cc b/deps/v8/tools/debug_helper/heap-constants.cc
new file mode 100644
index 0000000000..2bd0420690
--- /dev/null
+++ b/deps/v8/tools/debug_helper/heap-constants.cc
@@ -0,0 +1,51 @@
+// Copyright 2019 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.
+
+#include "heap-constants.h"
+#include "src/common/globals.h"
+
+namespace d = v8::debug_helper;
+
+namespace v8_debug_helper_internal {
+
+std::string FindKnownObject(uintptr_t address, const d::Roots& roots) {
+  uintptr_t containing_page = address & ~i::kPageAlignmentMask;
+  uintptr_t offset_in_page = address & i::kPageAlignmentMask;
+
+  // If there's a match with a known root, then search only that page.
+  if (containing_page == roots.map_space) {
+    return FindKnownObjectInMapSpace(offset_in_page);
+  }
+  if (containing_page == roots.old_space) {
+    return FindKnownObjectInOldSpace(offset_in_page);
+  }
+  if (containing_page == roots.read_only_space) {
+    return FindKnownObjectInReadOnlySpace(offset_in_page);
+  }
+
+  // For any unknown roots, compile a list of things this object might be.
+  std::string result;
+  if (roots.map_space == 0) {
+    std::string sub_result = FindKnownObjectInMapSpace(offset_in_page);
+    if (!sub_result.empty()) {
+      result += "maybe " + sub_result;
+    }
+  }
+  if (roots.old_space == 0) {
+    std::string sub_result = FindKnownObjectInOldSpace(offset_in_page);
+    if (!sub_result.empty()) {
+      result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
+    }
+  }
+  if (roots.read_only_space == 0) {
+    std::string sub_result = FindKnownObjectInReadOnlySpace(offset_in_page);
+    if (!sub_result.empty()) {
+      result = (result.empty() ? "" : result + ", ") + "maybe " + sub_result;
+    }
+  }
+
+  return result;
+}
+
+}  // namespace v8_debug_helper_internal