Report extra memory more (#4289)

* Report memory allocated in fetch

* Memory size reporting to `Headers`

* Fixup memory reporting allocator

* Make these tests do more

* cleanup some of this

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/bun.js/bindings/webcore/HTTPHeaderMap.cpp b/src/bun.js/bindings/webcore/HTTPHeaderMap.cpp
index 99fc9cf13..5021c699d 100644
--- a/src/bun.js/bindings/webcore/HTTPHeaderMap.cpp
+++ b/src/bun.js/bindings/webcore/HTTPHeaderMap.cpp
@@ -77,6 +77,25 @@ String HTTPHeaderMap::get(const String& name) const
     return getUncommonHeader(name);
 }
 
+size_t HTTPHeaderMap::memoryCost() const
+{
+    size_t cost = m_commonHeaders.size() * sizeof(CommonHeader);
+    cost += m_uncommonHeaders.size() * sizeof(UncommonHeader);
+    cost += m_setCookieHeaders.size() * sizeof(String);
+    for (auto& header : m_commonHeaders)
+        cost += header.value.sizeInBytes();
+
+    for (auto& header : m_uncommonHeaders) {
+        cost += header.key.sizeInBytes();
+        cost += header.value.sizeInBytes();
+    }
+
+    for (auto& header : m_setCookieHeaders)
+        cost += header.sizeInBytes();
+
+    return cost;
+}
+
 String HTTPHeaderMap::getUncommonHeader(const String& name) const
 {
     auto index = m_uncommonHeaders.findIf([&](auto& header) {