[Glacier] Add debug methods for HashMap and RefPtr.

lib/glacier/container/hash_map.h

@@ -6,6 +6,7 @@
 #include "glacier/container/linked_list.h"
 #include "glacier/container/pair.h"
 #include "glacier/status/error.h"
+#include "glacier/string/str_format.h"
 #include "glacier/string/string.h"
 #include "glacier/util/hash.h"
 
@@ -53,6 +54,8 @@ class HashMap {
 
   void Resize(uint64_t new_size);
 
+  void DebugIntoStr(StringBuilder& builder) const;
+
  private:
   Array<LinkedList<Pair<K, V>>> data_;
   uint64_t size_ = 0;
@@ -211,4 +214,26 @@ void HashMap<K, V, H>::ResizeIfNecessary() {
   }
 }
 
+template <typename K, typename V>
+void StrFormatValue(StringBuilder& builder, const HashMap<K, V>& value,
+                    StringView opts) {
+  value.DebugIntoStr(builder);
+}
+
+template <typename K, typename V, class H>
+void HashMap<K, V, H>::DebugIntoStr(StringBuilder& builder) const {
+  for (uint64_t i = 0; i < data_.size(); i++) {
+    if (data_[i].size() == 0) {
+      continue;
+    }
+    StrFormatValue(builder, i, "");
+    builder.PushBack(": ");
+    auto& ll = data_[i];
+    for (auto& item : ll) {
+      StrFormatInternal(builder, "{},", item.first());
+    }
+    builder.PushBack('\n');
+  }
+}
+
 }  // namespace glcr

lib/glacier/memory/ref_ptr.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "glacier/string/str_format.h"
+
 namespace glcr {
 
 template <typename T>
@@ -100,4 +102,10 @@ RefPtr<T> StaticCastRefPtr(const RefPtr<U>& ref) {
   return RefPtr(static_cast<T*>(ref.get()), RefPtr<T>::DontAdopt);
 }
 
+template <typename T>
+void StrFormatValue(StringBuilder& builder, const RefPtr<T>& value,
+                    StringView opts) {
+  StrFormatValue(builder, (uint64_t)value.get(), opts);
+}
+
 }  // namespace glcr