--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/elfFile.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 1997, 2013, 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.
+ *
+ */
+
+#ifndef SHARE_VM_UTILITIES_ELF_FILE_HPP
+#define SHARE_VM_UTILITIES_ELF_FILE_HPP
+
+#if !defined(_WINDOWS) && !defined(__APPLE__)
+
+#if defined(__OpenBSD__)
+#include <sys/exec_elf.h>
+#else
+#include <elf.h>
+#endif
+#include <stdio.h>
+
+#ifdef _LP64
+
+typedef Elf64_Half      Elf_Half;
+typedef Elf64_Word      Elf_Word;
+typedef Elf64_Off       Elf_Off;
+typedef Elf64_Addr      Elf_Addr;
+
+typedef Elf64_Ehdr      Elf_Ehdr;
+typedef Elf64_Shdr      Elf_Shdr;
+typedef Elf64_Phdr      Elf_Phdr;
+typedef Elf64_Sym       Elf_Sym;
+
+#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
+#define ELF_ST_TYPE ELF64_ST_TYPE
+#endif
+
+#else
+
+typedef Elf32_Half      Elf_Half;
+typedef Elf32_Word      Elf_Word;
+typedef Elf32_Off       Elf_Off;
+typedef Elf32_Addr      Elf_Addr;
+
+
+typedef Elf32_Ehdr      Elf_Ehdr;
+typedef Elf32_Shdr      Elf_Shdr;
+typedef Elf32_Phdr      Elf_Phdr;
+typedef Elf32_Sym       Elf_Sym;
+
+#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
+#define ELF_ST_TYPE ELF32_ST_TYPE
+#endif
+#endif
+
+#include "globalDefinitions.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/decoder.hpp"
+
+
+class ElfStringTable;
+class ElfSymbolTable;
+class ElfFuncDescTable;
+
+
+// On Solaris/Linux platforms, libjvm.so does contain all private symbols.
+// ElfFile is basically an elf file parser, which can lookup the symbol
+// that is the nearest to the given address.
+// Beware, this code is called from vm error reporting code, when vm is already
+// in "error" state, so there are scenarios, lookup will fail. We want this
+// part of code to be very defensive, and bait out if anything went wrong.
+
+class ElfFile: public CHeapObj<mtInternal> {
+  friend class ElfDecoder;
+ public:
+  ElfFile(const char* filepath);
+  ~ElfFile();
+
+  bool decode(address addr, char* buf, int buflen, int* offset);
+  const char* filepath() {
+    return m_filepath;
+  }
+
+  bool same_elf_file(const char* filepath) {
+    assert(filepath, "null file path");
+    assert(m_filepath, "already out of memory");
+    return (m_filepath && !strcmp(filepath, m_filepath));
+  }
+
+  NullDecoder::decoder_status get_status() {
+    return m_status;
+  }
+
+ private:
+  // sanity check, if the file is a real elf file
+  static bool is_elf_file(Elf_Ehdr&);
+
+  // load string tables from the elf file
+  bool load_tables();
+
+  // string tables are stored in a linked list
+  void add_string_table(ElfStringTable* table);
+
+  // symbol tables are stored in a linked list
+  void add_symbol_table(ElfSymbolTable* table);
+
+  // return a string table at specified section index
+  ElfStringTable* get_string_table(int index);
+
+protected:
+   ElfFile*  next() const { return m_next; }
+   void set_next(ElfFile* file) { m_next = file; }
+
+ public:
+  // Returns true if the elf file is marked NOT to require an executable stack,
+  // or if the file could not be opened.
+  // Returns false if the elf file requires an executable stack, the stack flag
+  // is not set at all, or if the file can not be read.
+  // On systems other than linux it always returns false.
+  static bool specifies_noexecstack(const char* filepath) NOT_LINUX({ return false; });
+
+ protected:
+    ElfFile*         m_next;
+
+ private:
+  // file
+  const char* m_filepath;
+  FILE* m_file;
+
+  // Elf header
+  Elf_Ehdr                     m_elfHdr;
+
+  // symbol tables
+  ElfSymbolTable*              m_symbol_tables;
+
+  // string tables
+  ElfStringTable*              m_string_tables;
+
+  // function descriptors table
+  ElfFuncDescTable*            m_funcDesc_table;
+
+  NullDecoder::decoder_status  m_status;
+};
+
+#endif // !_WINDOWS && !__APPLE__
+
+#endif // SHARE_VM_UTILITIES_ELF_FILE_HPP