[libc] Removed public function calls in table.h (#144168)

Removed strcmp, strlen, and memset calls from table.h and replaced them
with internal functions.

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>

libc/src/__support/HashTable/CMakeLists.txt

@@ -32,9 +32,8 @@ add_header_library(
     libc.src.__support.macros.attributes
     libc.src.__support.macros.optimization
     libc.src.__support.memory_size
-    libc.src.string.memset
-    libc.src.string.strcmp
-    libc.src.string.strlen
+    libc.src.string.memory_utils.inline_strcmp
+    libc.src.string.string_utils
 )
 
 add_header_library(

libc/src/__support/HashTable/table.h

@@ -18,9 +18,8 @@
 #include "src/__support/macros/config.h"
 #include "src/__support/macros/optimization.h"
 #include "src/__support/memory_size.h"
-#include "src/string/memset.h"
-#include "src/string/strcmp.h"
-#include "src/string/strlen.h"
+#include "src/string/memory_utils/inline_strcmp.h"
+#include "src/string/string_utils.h"
 #include <stddef.h>
 #include <stdint.h>
 
@@ -158,7 +157,9 @@ private:
       for (size_t i : masks) {
         size_t index = (pos + i) & entries_mask;
         ENTRY &entry = this->entry(index);
-        if (LIBC_LIKELY(entry.key != nullptr && strcmp(entry.key, key) == 0))
+        auto comp = [](char l, char r) -> int { return l - r; };
+        if (LIBC_LIKELY(entry.key != nullptr &&
+                        inline_strcmp(entry.key, key, comp) == 0))
           return index;
       }
       BitMask available = ctrls.mask_available();
@@ -176,7 +177,7 @@ private:
 
   LIBC_INLINE uint64_t oneshot_hash(const char *key) const {
     LIBC_NAMESPACE::internal::HashState hasher = state;
-    hasher.update(key, strlen(key));
+    hasher.update(key, internal::string_length(key));
     return hasher.finish();
   }
 
@@ -282,8 +283,8 @@ public:
       table->entries_mask = entries - 1u;
       table->available_slots = entries / 8 * 7;
       table->state = HashState{randomness};
-      memset(&table->control(0), 0x80, ctrl_sizes);
-      memset(mem, 0, table->offset_from_entries());
+      __builtin_memset(&table->control(0), 0x80, ctrl_sizes);
+      __builtin_memset(mem, 0, table->offset_from_entries());
     }
     return table;
   }

libc/test/src/__support/HashTable/table_test.cpp

@@ -108,7 +108,9 @@ TEST(LlvmLibcTableTest, Insertion) {
             static_cast<void *>(keys[CAP].bytes));
 
   for (size_t i = 0; i <= CAP; ++i) {
-    ASSERT_EQ(strcmp(table->find(keys[i].bytes)->key, keys[i].bytes), 0);
+    auto comp = [](char l, char r) -> int { return l - r; };
+    ASSERT_EQ(
+        inline_strcmp(table->find(keys[i].bytes)->key, keys[i].bytes, comp), 0);
   }
   for (size_t i = CAP + 1; i < 256; ++i) {
     ASSERT_EQ(table->find(keys[i].bytes), static_cast<ENTRY *>(nullptr));