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diff --git a/js/src/jit/JitHints-inl.h b/js/src/jit/JitHints-inl.h
new file mode 100644
index 0000000000..1dff08fe2b
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+++ b/js/src/jit/JitHints-inl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_JitHints_inl_h
+#define jit_JitHints_inl_h
+
+#include "jit/JitHints.h"
+#include "mozilla/HashFunctions.h"
+
+namespace js::jit {
+
+inline JitHintsMap::ScriptKey JitHintsMap::getScriptKey(
+    JSScript* script) const {
+  ScriptKey filenameHash = script->filenameHash();
+  // Do not include scrips that have an introducer filename.  These include
+  // dynamically created scripts such as eval() and new Function() which
+  // have a high probability of containing difference source.
+  if (filenameHash && !script->scriptSource()->hasIntroducerFilename()) {
+    return mozilla::AddToHash(filenameHash, script->sourceStart());
+  }
+  return 0;
+}
+
+inline void JitHintsMap::incrementBaselineEntryCount() {
+  // Clear the cache if we've exceeded the false positivity rate
+  // calculated by MaxEntries.
+  if (++baselineEntryCount_ > MaxEntries_) {
+    baselineHintMap_.clear();
+    baselineEntryCount_ = 0;
+  }
+}
+
+inline void JitHintsMap::setEagerBaselineHint(JSScript* script) {
+  ScriptKey key = getScriptKey(script);
+  if (!key) {
+    return;
+  }
+
+  // If the entry already exists, don't increment entryCount.
+  if (baselineHintMap_.mightContain(key)) {
+    return;
+  }
+
+  // Increment entry count, and possibly clear the cache.
+  incrementBaselineEntryCount();
+
+  script->setNoEagerBaselineHint(false);
+  baselineHintMap_.add(key);
+}
+
+inline bool JitHintsMap::mightHaveEagerBaselineHint(JSScript* script) const {
+  if (ScriptKey key = getScriptKey(script)) {
+    return baselineHintMap_.mightContain(key);
+  }
+  script->setNoEagerBaselineHint(true);
+  return false;
+}
+
+}  // namespace js::jit
+
+#endif /* jit_JitHints_inl_h */