From 61ba1cf93601b0a0877a8ade94ba3c674a09f77e Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Fri, 29 Sep 2006 19:58:17 +0000
Subject: Snapshot.  Now able to produce a minimal executable which actually
 runs.

---
 gold/archive.h | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 gold/archive.h

(limited to 'gold/archive.h')

diff --git a/gold/archive.h b/gold/archive.h
new file mode 100644
index 0000000..14d1c3b
--- /dev/null
+++ b/gold/archive.h
@@ -0,0 +1,143 @@
+// archive.h -- archive support for gold      -*- C++ -*-
+
+#ifndef GOLD_ARCHIVE_H
+#define GOLD_ARCHIVE_H
+
+#include <string>
+#include <vector>
+
+#include "workqueue.h"
+
+namespace gold
+{
+
+class Input_file;
+class Input_objects;
+class Symbol_table;
+
+// This class represents an archive--generally a libNAME.a file.
+// Archives have a symbol table and a list of objects.
+
+class Archive
+{
+ public:
+  Archive(const std::string& name, Input_file* input_file)
+    : name_(name), input_file_(input_file), armap_(), extended_names_()
+  { }
+
+  // The length of the magic string at the start of an archive.
+  static const int sarmag = 8;
+
+  // The magic string at the start of an archive.
+  static const char armag[sarmag];
+
+  // The string expected at the end of an archive member header.
+  static const char arfmag[2];
+
+  // The name of the object.
+  const std::string&
+  name() const
+  { return this->name_; }
+
+  // Set up the archive: read the symbol map.
+  void
+  setup();
+
+  // Lock the underlying file.
+  void
+  lock()
+  { this->input_file_->file().lock(); }
+
+  // Unlock the underlying file.
+  void
+  unlock()
+  { this->input_file_->file().unlock(); }
+
+  // Return whether the underlying file is locked.
+  bool
+  is_locked() const
+  { return this->input_file_->file().is_locked(); }
+
+  // Select members from the archive as needed and add them to the
+  // link.
+  void
+  add_symbols(Symbol_table*, Input_objects*);
+
+ private:
+  Archive(const Archive&);
+  Archive& operator=(const Archive&);
+
+  struct Archive_header;
+  class Add_archive_symbols_locker;
+
+  // Get a view into the underlying file.
+  const unsigned char*
+  get_view(off_t start, off_t size);
+
+  // Read an archive member header at OFF.  Return the size of the
+  // member, and set *PNAME to the name.
+  off_t
+  read_header(off_t off, std::string* pname);
+
+  // Include an archive member in the link.
+  void
+  include_member(Symbol_table*, Input_objects*, off_t off);
+
+  // An entry in the archive map of symbols to object files.
+  struct Armap_entry
+  {
+    // The symbol name.
+    const char* name;
+    // The offset to the file.
+    off_t offset;
+  };
+
+  // Name of object as printed to user.
+  std::string name_;
+  // For reading the file.
+  Input_file* input_file_;
+  // The archive map.
+  std::vector<Armap_entry> armap_;
+  // The extended name table.
+  std::string extended_names_;
+};
+
+// This class is used to read an archive and pick out the desired
+// elements and add them to the link.
+
+class Add_archive_symbols : public Task
+{
+ public:
+  Add_archive_symbols(Symbol_table* symtab, Input_objects* input_objects,
+		      Archive* archive, Task_token* this_blocker,
+		      Task_token* next_blocker)
+    : symtab_(symtab), input_objects_(input_objects), archive_(archive),
+      this_blocker_(this_blocker), next_blocker_(next_blocker)
+  { }
+
+  ~Add_archive_symbols();
+
+  // The standard Task methods.
+
+  Is_runnable_type
+  is_runnable(Workqueue*);
+
+  Task_locker*
+  locks(Workqueue*);
+
+  void
+  run(Workqueue*);
+
+ private:
+  class Add_archive_symbols_locker;
+
+  Symbol_table* symtab_;
+  Input_objects* input_objects_;
+  Archive* archive_;
+  Task_token* this_blocker_;
+  Task_token* next_blocker_;
+};
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_ARCHIVE_H)
-- 
cgit v1.1