3 files changed, 40 insertions, 0 deletions
diff --git a/chromium/v8/tools/debug_helper/BUILD.gn b/chromium/v8/tools/debug_helper/BUILD.gn
index a2d76d1fda7..522a0e22702 100644
--- a/chromium/v8/tools/debug_helper/BUILD.gn
+++ b/chromium/v8/tools/debug_helper/BUILD.gn
@@ -76,6 +76,7 @@ v8_component("v8_debug_helper") {
     "$target_gen_dir/../../torque-generated/class-debug-readers-tq.h",
     "$target_gen_dir/../../torque-generated/instance-types-tq.h",
     "$target_gen_dir/heap-constants-gen.cc",
+    "compiler-types.cc",
     "debug-helper-internal.cc",
     "debug-helper-internal.h",
     "debug-helper.h",
diff --git a/chromium/v8/tools/debug_helper/compiler-types.cc b/chromium/v8/tools/debug_helper/compiler-types.cc
new file mode 100644
index 00000000000..1d9f6eb0d3e
--- /dev/null
+++ b/chromium/v8/tools/debug_helper/compiler-types.cc
@@ -0,0 +1,31 @@
+// Copyright 2020 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 "debug-helper-internal.h"
+#include "src/compiler/types.h"
+
+namespace ic = v8::internal::compiler;
+
+extern "C" {
+V8_DEBUG_HELPER_EXPORT const char* _v8_debug_helper_BitsetName(
+    uint64_t payload) {
+  // Check if payload is a bitset and return the bitset type.
+  // This line is duplicating the logic from Type::IsBitset.
+  bool is_bit_set = payload & 1;
+  if (!is_bit_set) return nullptr;
+  ic::BitsetType::bitset bits =
+      static_cast<ic::BitsetType::bitset>(payload ^ 1u);
+  switch (bits) {
+#define RETURN_NAMED_TYPE(type, value) \
+  case ic::BitsetType::k##type:        \
+    return #type;
+    PROPER_BITSET_TYPE_LIST(RETURN_NAMED_TYPE)
+    INTERNAL_BITSET_TYPE_LIST(RETURN_NAMED_TYPE)
+#undef RETURN_NAMED_TYPE
+
+    default:
+      return nullptr;
+  }
+}
+}
diff --git a/chromium/v8/tools/debug_helper/debug-helper.h b/chromium/v8/tools/debug_helper/debug-helper.h
index df850e81edb..dc08bf63469 100644
--- a/chromium/v8/tools/debug_helper/debug-helper.h
+++ b/chromium/v8/tools/debug_helper/debug-helper.h
@@ -195,6 +195,8 @@ V8_DEBUG_HELPER_EXPORT void _v8_debug_helper_Free_ObjectPropertiesResult(
     v8::debug_helper::ObjectPropertiesResult* result);
 V8_DEBUG_HELPER_EXPORT const v8::debug_helper::ClassList*
 _v8_debug_helper_ListObjectClasses();
+V8_DEBUG_HELPER_EXPORT const char* _v8_debug_helper_BitsetName(
+    uint64_t payload);
 }
 
 namespace v8 {
@@ -229,6 +231,12 @@ inline const ClassList* ListObjectClasses() {
   return _v8_debug_helper_ListObjectClasses();
 }
 
+// Return a bitset name for a v8::internal::compiler::Type with payload or null
+// if the payload is not a bitset.
+inline const char* BitsetName(uint64_t payload) {
+  return _v8_debug_helper_BitsetName(payload);
+}
+
 }  // namespace debug_helper
 }  // namespace v8