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authorIan Lance Taylor <iant@google.com>2006-09-29 19:58:17 +0000
committerIan Lance Taylor <iant@google.com>2006-09-29 19:58:17 +0000
commit61ba1cf93601b0a0877a8ade94ba3c674a09f77e (patch)
treeffa744ec1dffd7f2dae13150b1dd7784728ed0a4 /gold/archive.h
parent4dba4b2419ccdbf48fd016edb7e0e10016897827 (diff)
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Snapshot. Now able to produce a minimal executable which actually
runs.
Diffstat (limited to 'gold/archive.h')
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+// 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)