// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class Dynobj;
class Object_merge_map;
class Relocatable_relocs;
+class Symbols_data;
template<typename Stringpool_char>
class Stringpool_template;
target() const
{ return this->target_; }
+ // Get the file. We pass on const-ness.
+ Input_file*
+ input_file()
+ { return this->input_file_; }
+
+ const Input_file*
+ input_file() const
+ { return this->input_file_; }
+
// Lock the underlying file.
void
lock(const Task* t)
// Add symbol information to the global symbol table.
void
- add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
- { this->do_add_symbols(symtab, sd); }
+ add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout)
+ { this->do_add_symbols(symtab, sd, layout); }
// Functions and types for the elfcpp::Elf_file interface. This
// permit us to use Object as the File template parameter for
set_target(Target* target)
{ this->target_ = target; }
+ // Return whether this object was found in a system directory.
+ bool
+ is_in_system_directory() const
+ { return this->input_file()->is_in_system_directory(); }
+
+ // Return whether we found this object by searching a directory.
+ bool
+ searched_for() const
+ { return this->input_file()->will_search_for(); }
+
protected:
// Returns NULL for Objects that are not plugin objects. This method
// is overridden in the Pluginobj class.
// Add symbol information to the global symbol table--implemented by
// child class.
virtual void
- do_add_symbols(Symbol_table*, Read_symbols_data*) = 0;
+ do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0;
// Return the location of the contents of a section. Implemented by
// child class.
virtual void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
- // Get the file. We pass on const-ness.
- Input_file*
- input_file()
- { return this->input_file_; }
-
- const Input_file*
- input_file() const
- { return this->input_file_; }
-
// Set the target.
void
set_target(int machine, int size, bool big_endian, int osabi,
relocs_must_follow_section_writes_(false)
{ }
+ // During garbage collection, the Read_symbols_data pass for
+ // each object is stored as layout needs to be done after
+ // reloc processing.
+ Symbols_data*
+ get_symbols_data()
+ { return this->sd_; }
+
+ // Decides which section names have to be included in the worklist
+ // as roots.
+ bool
+ is_section_name_included(const char *name);
+
+ void
+ copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd,
+ unsigned int section_header_size);
+
+ void
+ set_symbols_data(Symbols_data* sd)
+ { this->sd_ = sd; }
+
+ // During garbage collection, the Read_relocs pass for all objects
+ // is done before scanning the relocs. In that case, this->rd_ is
+ // used to store the information from Read_relocs for each object.
+ // This data is also used to compute the list of relevant sections.
+ Read_relocs_data*
+ get_relocs_data()
+ { return this->rd_; }
+
+ void
+ set_relocs_data(Read_relocs_data* rd)
+ { this->rd_ = rd; }
+
+ virtual bool
+ is_output_section_offset_invalid(unsigned int shndx) const = 0;
+
// Read the relocs.
void
read_relocs(Read_relocs_data* rd)
{ return this->do_read_relocs(rd); }
+ // Process the relocs, during garbage collection only.
+ void
+ gc_process_relocs(const General_options& options, Symbol_table* symtab,
+ Layout* layout, Read_relocs_data* rd)
+ { return this->do_gc_process_relocs(options, symtab, layout, rd); }
+
// Scan the relocs and adjust the symbol table.
void
scan_relocs(const General_options& options, Symbol_table* symtab,
virtual void
do_read_relocs(Read_relocs_data*) = 0;
+ // Process the relocs--implemented by child class.
+ virtual void
+ do_gc_process_relocs(const General_options&, Symbol_table*, Layout*,
+ Read_relocs_data*) = 0;
+
// Scan the relocs--implemented by child class.
virtual void
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
// Whether we need to wait for output sections to be written before
// we can apply relocations.
bool relocs_must_follow_section_writes_;
+ // Used to store the relocs data computed by the Read_relocs pass.
+ // Used during garbage collection of unused sections.
+ Read_relocs_data* rd_;
+ // Used to store the symbols data computed by the Read_symbols pass.
+ // Again used during garbage collection when laying out referenced
+ // sections.
+ gold::Symbols_data *sd_;
};
// This class is used to handle relocations against a section symbol
~Sized_relobj();
+ // Checks if the offset of input section SHNDX within its output
+ // section is invalid.
+ bool
+ is_output_section_offset_invalid(unsigned int shndx) const
+ { return this->get_output_section_offset(shndx) == invalid_address; }
+
// Set up the object file based on the ELF header.
void
setup(const typename elfcpp::Ehdr<size, big_endian>&);
// Add the symbols to the symbol table.
void
- do_add_symbols(Symbol_table*, Read_symbols_data*);
+ do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*);
// Read the relocs.
void
do_read_relocs(Read_relocs_data*);
+ // Process the relocs to find list of referenced sections. Used only
+ // during garbage collection.
+ void
+ do_gc_process_relocs(const General_options&, Symbol_table*, Layout*,
+ Read_relocs_data*);
+
// Scan the relocs and adjust the symbol table.
void
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
typedef std::map<unsigned int, Kept_comdat_section*>
Kept_comdat_section_table;
- // Information needed to keep track of kept comdat groups. This is
- // simply a map from the section name to its section index. This may
- // not be a one-to-one mapping, but we ignore that possibility since
- // this is used only to attempt to handle stray relocations from
- // non-comdat debug sections that refer to comdat loadable sections.
- typedef Unordered_map<std::string, unsigned int> Comdat_group;
-
- // A map from group section index to the table of group members.
- typedef std::map<unsigned int, Comdat_group*> Comdat_group_table;
-
- // Find a comdat group table given its group section SHNDX.
- Comdat_group*
- find_comdat_group(unsigned int shndx) const
- {
- Comdat_group_table::const_iterator p =
- this->comdat_groups_.find(shndx);
- if (p != this->comdat_groups_.end())
- return p->second;
- return NULL;
- }
-
- // Record a new comdat group whose group section index is SHNDX.
- void
- add_comdat_group(unsigned int shndx, Comdat_group* group)
- { this->comdat_groups_[shndx] = group; }
-
// Adjust a section index if necessary.
unsigned int
adjust_shndx(unsigned int shndx)
std::vector<Address> section_offsets_;
// Table mapping discarded comdat sections to corresponding kept sections.
Kept_comdat_section_table kept_comdat_sections_;
- // Table of kept comdat groups.
- Comdat_group_table comdat_groups_;
// Whether this object has a GNU style .eh_frame section.
bool has_eh_frame_;
// The list of sections whose layout was deferred.
{
public:
Input_objects()
- : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(),
- cref_(NULL)
+ : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL)
{ }
// The type of the list of input relocateable objects.
Dynobj_list dynobj_list_;
// SONAMEs that we have seen.
Unordered_set<std::string> sonames_;
- // The directory in which we find the libc.so.
- std::string system_library_directory_;
// Manage cross-references if requested.
Cref* cref_;
};
location(size_t relnum, off_t reloffset) const;
};
+// Return whether INPUT_FILE contains an ELF object start at file
+// offset OFFSET. This sets *START to point to a view of the start of
+// the file. It sets *READ_SIZE to the number of bytes in the view.
+
+extern bool
+is_elf_object(Input_file* input_file, off_t offset,
+ const unsigned char** start, int *read_size);
+
// Return an Object appropriate for the input file. P is BYTES long,
-// and holds the ELF header.
+// and holds the ELF header. If PUNCONFIGURED is not NULL, then if
+// this sees an object the linker is not configured to support, it
+// sets *PUNCONFIGURED to true and returns NULL without giving an
+// error message.
extern Object*
make_elf_object(const std::string& name, Input_file*,
off_t offset, const unsigned char* p,
- section_offset_type bytes);
+ section_offset_type bytes, bool* punconfigured);
} // end namespace gold
projects / deliverable / binutils-gdb.git / blobdiff