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