From 75bb1e696321cf1b9ac6b124312b57560a06ff39 Mon Sep 17 00:00:00 2001
From: Chris Johns <chrisj@rtems.org>
Date: Mon, 7 May 2012 08:47:11 +1000
Subject: Add to git.

---
 rld-symbols.h | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 rld-symbols.h

(limited to 'rld-symbols.h')

diff --git a/rld-symbols.h b/rld-symbols.h
new file mode 100644
index 0000000..ec6938d
--- /dev/null
+++ b/rld-symbols.h
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2011, Chris Johns <chrisj@rtems.org> 
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/**
+ * @file
+ *
+ * @ingroup rtems-ld
+ *
+ * @brief RTEMS Linker symbols manages the symbols from all the object files.
+ *
+ */
+
+#if !defined (_RLD_SYMBOLS_H_)
+#define _RLD_SYMBOLS_H_
+
+#include <iostream>
+#include <list>
+#include <map>
+#include <string>
+
+#include <rld-elf-types.h>
+
+namespace rld
+{
+  /**
+   * Forward declarations.
+   */
+  namespace files
+  {
+    class object;
+  }
+
+  namespace symbols
+  {
+    /**
+     * A symbol.
+     */
+    class symbol
+    {
+    public:
+      /**
+       * Default constructor. No symbol has been defined.
+       */
+      symbol ();
+
+      /**
+       * Construct an exported symbol with a object file.
+       */
+      symbol (const std::string&  name, 
+              rld::files::object& object,
+              const elf::elf_sym& esym);
+
+      /**
+       * Construct an unresolved symbol with no object file.
+       */
+      symbol (const std::string& name, const elf::elf_sym& esym);
+      
+      /**
+       * Construct a linker symbol that is internally created.
+       */
+      symbol (const std::string&  name,
+              const elf::elf_addr value);
+      
+      /**
+       * Construct a linker symbol that is internally created.
+       */
+      symbol (const char*        name,
+              rld::elf::elf_addr value = 0);
+      
+      /**
+       * The symbol's name.
+       */
+      const std::string& name () const;
+
+      /**
+       * The symbol's demangled name.
+       */
+      const std::string& demangled () const;
+
+      /**
+       * Is the symbol a C++ name ?
+       */
+      bool is_cplusplus () const;
+
+      /**
+       * The symbol's object file name.
+       */
+      rld::files::object* object () const;
+
+      /**
+       * Set the symbol's object file name. Used when resolving unresolved
+       * symbols.
+       */
+      void set_object (rld::files::object& obj);
+
+      /**
+       * The ELF symbol.
+       */
+      const ::GElf_Sym& esym () const;
+
+      /**
+       * Return the number of references.
+       */
+      int references () const {
+        return references_;
+      }
+
+      /**
+       * Return the number of references.
+       */
+      void referenced ();
+
+      /**
+       * Less than operator for the map container.
+       */
+      bool operator< (const symbol& rhs) const;
+
+      /**
+       * Output to the a stream.
+       */
+      void output (std::ostream& out) const;
+
+    private:
+      std::string         name_;       //< The name of the symbol.
+      std::string         demangled_;  //< If a C++ symbol the demangled name.
+      rld::files::object* object_;     //< The object file containing the
+                                       //  symbol.
+      ::GElf_Sym          esym_;       //< The ELF symbol.
+      int                 references_; //< The number of times if it referenced.
+    };
+
+    /**
+     * List of symbol references.
+     */
+    typedef std::list < symbol* > list;
+
+    /**
+     * A symbols table is a map container of symbols.
+     */
+    typedef std::map < std::string, symbol > table;
+
+    /**
+     * Given a list of symbols return how many are referenced.
+     */
+    size_t referenced (list& symbols);
+
+    /**
+     * Output the symbol table.
+     */
+    void output (std::ostream& out, const table& symbols);
+  }
+}
+
+/**
+ * Output stream operator.
+ */
+static inline std::ostream& operator<< (std::ostream& out, const rld::symbols::symbol& sym) {
+  sym.output (out);
+  return out;
+}
+
+#endif
-- 
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