--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/elfStringTable.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#if !defined(_WINDOWS) && !defined(__APPLE__)
+
+#include "memory/allocation.inline.hpp"
+#include "prims/jvm.h"
+#include "runtime/os.hpp"
+#include "utilities/elfStringTable.hpp"
+
+// We will try to load whole string table into memory if we can.
+// Otherwise, fallback to more expensive file operation.
+ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
+  assert(file, "null file handle");
+  m_table = NULL;
+  m_index = index;
+  m_next = NULL;
+  m_file = file;
+  m_status = NullDecoder::no_error;
+
+  // try to load the string table
+  long cur_offset = ftell(file);
+  m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size, mtInternal);
+  if (m_table != NULL) {
+    // if there is an error, mark the error
+    if (fseek(file, shdr.sh_offset, SEEK_SET) ||
+      fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
+      fseek(file, cur_offset, SEEK_SET)) {
+      m_status = NullDecoder::file_invalid;
+      os::free((void*)m_table);
+      m_table = NULL;
+    }
+  } else {
+    memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
+  }
+}
+
+ElfStringTable::~ElfStringTable() {
+  if (m_table != NULL) {
+    os::free((void*)m_table);
+  }
+
+  if (m_next != NULL) {
+    delete m_next;
+  }
+}
+
+bool ElfStringTable::string_at(int pos, char* buf, int buflen) {
+  if (NullDecoder::is_error(m_status)) {
+    return false;
+  }
+  if (m_table != NULL) {
+    jio_snprintf(buf, buflen, "%s", (const char*)(m_table + pos));
+    return true;
+  } else {
+    long cur_pos = ftell(m_file);
+    if (cur_pos == -1 ||
+      fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
+      fread(buf, 1, buflen, m_file) <= 0 ||
+      fseek(m_file, cur_pos, SEEK_SET)) {
+      m_status = NullDecoder::file_invalid;
+      return false;
+    }
+    return true;
+  }
+}
+
+#endif // !_WINDOWS && !__APPLE__