Initial CVS checkin of gold

1 files changed, 160 insertions, 0 deletions

diff --git a/gold/object.h b/gold/object.h
new file mode 100644
index 0000000..9d63b11
--- /dev/null
+++ b/gold/object.h
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+// object.h -- support for an object file for linking in gold  -*- C++ -*-
+
+#ifndef GOLD_OBJECT_H
+#define GOLD_OBJECT_H
+
+#include "elfcpp.h"
+#include "targetsize.h"
+#include "target.h"
+#include "fileread.h"
+
+namespace gold
+{
+
+// Data to pass from read_symbols() to add_symbols().
+
+struct Read_symbols_data
+{
+  // Symbol data.
+  File_view* symbols;
+  // Size of symbol data in bytes.
+  off_t symbols_size;
+  // Symbol names.
+  File_view* symbol_names;
+  // Size of symbol name data in bytes.
+  off_t symbol_names_size;
+};
+
+// Object is an interface which represents either a 32-bit or a 64-bit
+// object file.  The actual instantiations are Sized_object<32> and
+// Sized_object<64>
+
+class Object
+{
+ public:
+  // NAME is the name of the object as we would report it to the user
+  // (e.g., libfoo.a(bar.o) if this is in an archive.  INPUT_FILE is
+  // used to read the file.  OFFSET is the offset within the input
+  // file--0 for a .o or .so file, something else for a .a file.
+  Object(const std::string& name, Input_file* input_file, off_t offset = 0)
+    : name_(name), input_file_(input_file), offset_(offset)
+  { }
+
+  virtual ~Object()
+  { }
+
+  const std::string&
+  name() const
+  { return this->name_; }
+
+  // Read the symbol and relocation information.
+  Read_symbols_data
+  read_symbols()
+  { return this->do_read_symbols(); }
+
+  // Add symbol information to the global symbol table.
+  void
+  add_symbols(Read_symbols_data rd)
+  { this->do_add_symbols(rd); }
+
+ protected:
+  // Read the symbols--implemented by child class.
+  virtual Read_symbols_data
+  do_read_symbols() = 0;
+
+  // Add symbol information to the global symbol table--implemented by
+  // child class.
+  virtual void
+  do_add_symbols(Read_symbols_data) = 0;
+
+  // Get the file.
+  Input_file*
+  input_file() const
+  { return this->input_file_; }
+
+  // Get the offset into the file.
+  off_t
+  offset() const
+  { return this->offset_; }
+
+  // Get a view into the underlying file.
+  const unsigned char*
+  get_view(off_t start, off_t size);
+
+  // Read data from the underlying file.
+  void
+  read(off_t start, off_t size, void* p);
+
+  // Get a lasting view into the underlying file.
+  File_view*
+  get_lasting_view(off_t start, off_t size);
+
+ private:
+  // This class may not be copied.
+  Object(const Object&);
+  Object& operator=(const Object&);
+
+  // Name of object as printed to use.
+  std::string name_;
+  // For reading the file.
+  Input_file* input_file_;
+  // Offset within the file--0 for an object file, non-0 for an
+  // archive.
+  off_t offset_;
+};
+
+// The functions of Object which are size specific.
+
+template<int size, bool big_endian>
+class Sized_object : public Object
+{
+ public:
+  Sized_object(const std::string& name, Input_file* input_file, off_t offset,
+	       const typename elfcpp::Ehdr<size, big_endian>&);
+
+  ~Sized_object();
+
+  void
+  setup(const typename elfcpp::Ehdr<size, big_endian>&);
+
+  Read_symbols_data
+  do_read_symbols();
+
+  void
+  do_add_symbols(Read_symbols_data);
+
+ private:
+  // This object may not be copied.
+  Sized_object(const Sized_object&);
+  Sized_object& operator=(const Sized_object&);
+
+  // ELF file header EI_OSABI field.
+  unsigned char osabi_;
+  // ELF file header EI_ABIVERSION field.
+  unsigned char abiversion_;
+  // ELF file header e_machine field.
+  elfcpp::Elf_Half machine_;
+  // ELF file header e_flags field.
+  unsigned int flags_;
+  // Target functions--may be NULL.
+  Target* target_;
+  // File offset of section header table.
+  off_t shoff_;
+  // Number of input sections.
+  unsigned int shnum_;
+  // Offset of SHT_STRTAB section holding section names.
+  unsigned int shstrndx_;
+  // Index of SHT_SYMTAB section.
+  unsigned int symtab_shnum_;
+};
+
+// Return an Object appropriate for the input file.  P is BYTES long,
+// and holds the ELF header.
+
+extern Object* make_elf_object(const std::string& name, Input_file*,
+			       off_t offset, const unsigned char* p,
+			       off_t bytes);
+
+} // end namespace gold
+
+#endif // !defined(GOLD_OBJECT_H)