LibELF: Implement GNU hash section lookups for x86_64

Userland/Libraries/LibELF/DynamicObject.cpp

@@ -276,8 +276,7 @@ auto DynamicObject::HashSection::lookup_sysv_symbol(const StringView& name, u32
 auto DynamicObject::HashSection::lookup_gnu_symbol(const StringView& name, u32 hash_value) const -> Optional<Symbol>
 {
     // Algorithm reference: https://ent-voy.blogspot.com/2011/02/
-    // TODO: Handle 64bit bloomwords for ELF_CLASS64
-    using BloomWord = u32;
+    using BloomWord = FlatPtr;
     constexpr size_t bloom_word_size = sizeof(BloomWord) * 8;
 
     const u32* hash_table_begin = (u32*)address().as_ptr();
@@ -289,13 +288,13 @@ auto DynamicObject::HashSection::lookup_gnu_symbol(const StringView& name, u32 h
     const u32 num_maskwords_bitmask = num_maskwords - 1;
     const u32 shift2 = hash_table_begin[3];
 
-    const BloomWord* bloom_words = &hash_table_begin[4];
-    const u32* const buckets = &bloom_words[num_maskwords];
+    const BloomWord* bloom_words = (BloomWord const*)&hash_table_begin[4];
+    const u32* const buckets = (u32 const*)&bloom_words[num_maskwords];
     const u32* const chains = &buckets[num_buckets];
 
     BloomWord hash1 = hash_value;
     BloomWord hash2 = hash1 >> shift2;
-    const BloomWord bitmask = (1 << (hash1 % bloom_word_size)) | (1 << (hash2 % bloom_word_size));
+    const BloomWord bitmask = ((BloomWord)1 << (hash1 % bloom_word_size)) | ((BloomWord)1 << (hash2 % bloom_word_size));
 
     if ((bloom_words[(hash1 / bloom_word_size) & num_maskwords_bitmask] & bitmask) != bitmask)
         return {};