// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2006-2015 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class Layout;
class Output_data;
class Output_section;
+class Output_section_data;
class Output_file;
class Output_symtab_xindex;
class Pluginobj;
class Dynobj;
class Object_merge_map;
class Relocatable_relocs;
-class Symbols_data;
+struct Symbols_data;
template<typename Stringpool_char>
class Stringpool_template;
{
std::string source_file;
std::string enclosing_symbol_name;
- int line_number;
+ elfcpp::STT enclosing_symbol_type;
};
// Data about a single relocation section. This is read in
Got_offset_list* got_next_;
};
+// Type for mapping section index to uncompressed size and contents.
+
+struct Compressed_section_info
+{
+ section_size_type size;
+ const unsigned char* contents;
+};
+typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
+
+template<int size, bool big_endian>
+Compressed_section_map*
+build_compressed_section_map(const unsigned char* pshdrs, unsigned int shnum,
+ const char* names, section_size_type names_size,
+ Object* obj, bool decompress_if_needed);
+
// Object is an abstract base class which represents either a 32-bit
// or a 64-bit input object. This can be a regular object file
// (ET_REL) or a shared object (ET_DYN).
: name_(name), input_file_(input_file), offset_(offset), shnum_(-1U),
is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false),
has_no_split_stack_(false), no_export_(false),
- is_in_system_directory_(false), as_needed_(false), xindex_(NULL)
+ is_in_system_directory_(false), as_needed_(false), xindex_(NULL),
+ compressed_sections_(NULL)
{
if (input_file != NULL)
{
this->input_file_->file().remove_object();
}
- // Return the name of the object as we would report it to the tuser.
+ // Return the name of the object as we would report it to the user.
const std::string&
name() const
{ return this->name_; }
// Return the name of a section given a section index.
std::string
- section_name(unsigned int shndx)
+ section_name(unsigned int shndx) const
{ return this->do_section_name(shndx); }
// Return the section flags given a section index.
output_section(unsigned int shndx) const
{ return this->do_output_section(shndx); }
+ // Given a section index, return its address.
+ // The return value will be -1U if the section is specially mapped,
+ // such as a merge section.
+ uint64_t
+ output_section_address(unsigned int shndx)
+ { return this->do_output_section_address(shndx); }
+
// Given a section index, return the offset in the Output_section.
// The return value will be -1U if the section is specially mapped,
// such as a merge section.
set_no_export(bool value)
{ this->no_export_ = value; }
- // Return TRUE if the section is a compressed debug section, and set
- // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
bool
section_is_compressed(unsigned int shndx,
section_size_type* uncompressed_size) const
- { return this->do_section_is_compressed(shndx, uncompressed_size); }
+ {
+ if (this->compressed_sections_ == NULL)
+ return false;
+ Compressed_section_map::const_iterator p =
+ this->compressed_sections_->find(shndx);
+ if (p != this->compressed_sections_->end())
+ {
+ if (uncompressed_size != NULL)
+ *uncompressed_size = p->second.size;
+ return true;
+ }
+ return false;
+ }
// Return a view of the decompressed contents of a section. Set *PLEN
// to the size. Set *IS_NEW to true if the contents need to be freed
// by the caller.
const unsigned char*
decompressed_section_contents(unsigned int shndx, section_size_type* plen,
- bool* is_cached)
- { return this->do_decompressed_section_contents(shndx, plen, is_cached); }
+ bool* is_cached);
// Discard any buffers of decompressed sections. This is done
// at the end of the Add_symbols task.
void
- discard_decompressed_sections()
- { this->do_discard_decompressed_sections(); }
+ discard_decompressed_sections();
// Return the index of the first incremental relocation for symbol SYMNDX.
unsigned int
// Get the name of a section--implemented by child class.
virtual std::string
- do_section_name(unsigned int shndx) = 0;
+ do_section_name(unsigned int shndx) const = 0;
// Get section flags--implemented by child class.
virtual uint64_t
do_output_section(unsigned int) const
{ gold_unreachable(); }
+ // Get the address of a section--implemented by child class.
+ virtual uint64_t
+ do_output_section_address(unsigned int)
+ { gold_unreachable(); }
+
// Get the offset of a section--implemented by child class.
virtual uint64_t
do_output_section_offset(unsigned int) const
read_section_data(elfcpp::Elf_file<size, big_endian, Object>*,
Read_symbols_data*);
+ // Find the section header with the given NAME. If HDR is non-NULL
+ // then it is a section header returned from a previous call to this
+ // function and the next section header with the same name will be
+ // returned.
+ template<int size, bool big_endian>
+ const unsigned char*
+ find_shdr(const unsigned char* pshdrs, const char* name,
+ const char* names, section_size_type names_size,
+ const unsigned char* hdr) const;
+
// Let the child class initialize the xindex object directly.
void
set_xindex(Xindex* xindex)
bool
handle_split_stack_section(const char* name);
- // Return TRUE if the section is a compressed debug section, and set
- // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
- virtual bool
- do_section_is_compressed(unsigned int, section_size_type*) const
- { return false; }
-
- // Return a view of the decompressed contents of a section. Set *PLEN
- // to the size. This default implementation simply returns the
- // raw section contents and sets *IS_NEW to false to indicate
- // that the contents do not need to be freed by the caller.
- // This function must be overridden for any types of object files
- // that might contain compressed sections.
- virtual const unsigned char*
- do_decompressed_section_contents(unsigned int shndx,
- section_size_type* plen,
- bool* is_new)
- {
- *is_new = false;
- return this->do_section_contents(shndx, plen, false);
- }
-
// Discard any buffers of decompressed sections. This is done
// at the end of the Add_symbols task.
virtual void
do_get_incremental_reloc_count(unsigned int) const
{ gold_unreachable(); }
+ void
+ set_compressed_sections(Compressed_section_map* compressed_sections)
+ { this->compressed_sections_ = compressed_sections; }
+
+ Compressed_section_map*
+ compressed_sections()
+ { return this->compressed_sections_; }
+
private:
// This class may not be copied.
Object(const Object&);
bool as_needed_ : 1;
// Many sections for objects with more than SHN_LORESERVE sections.
Xindex* xindex_;
+ // For compressed debug sections, map section index to uncompressed size
+ // and contents.
+ Compressed_section_map* compressed_sections_;
};
// A regular object (ET_REL). This is an abstract base class itself.
unsigned int got_offset)
{ this->do_set_local_got_offset(symndx, got_type, got_offset); }
+ // Return whether the local symbol SYMNDX is a TLS symbol.
+ bool
+ local_is_tls(unsigned int symndx) const
+ { return this->do_local_is_tls(symndx); }
+
// The number of local symbols in the input symbol table.
virtual unsigned int
local_symbol_count() const
return this->output_sections_[shndx] != NULL;
}
- // The the output section of the input section with index SHNDX.
+ // The output section of the input section with index SHNDX.
// This is only used currently to remove a section from the link in
// relaxation.
void
relocs_must_follow_section_writes() const
{ return this->relocs_must_follow_section_writes_; }
- // Return the object merge map.
Object_merge_map*
- merge_map() const
- { return this->object_merge_map_; }
+ get_or_create_merge_map();
- // Set the object merge map.
+ template<int size>
void
- set_merge_map(Object_merge_map* object_merge_map)
- {
- gold_assert(this->object_merge_map_ == NULL);
- this->object_merge_map_ = object_merge_map;
- }
+ initialize_input_to_output_map(unsigned int shndx,
+ typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
+ Unordered_map<section_offset_type,
+ typename elfcpp::Elf_types<size>::Elf_Addr>* output_address) const;
+
+ void
+ add_merge_mapping(Output_section_data *output_data,
+ unsigned int shndx, section_offset_type offset,
+ section_size_type length,
+ section_offset_type output_offset);
+
+ bool
+ merge_output_offset(unsigned int shndx, section_offset_type offset,
+ section_offset_type *poutput) const;
+
+ const Output_section_data*
+ find_merge_section(unsigned int shndx) const;
// Record the relocatable reloc info for an input reloc section.
void
do_get_incremental_reloc_count(unsigned int symndx) const
{ return this->reloc_counts_[symndx]; }
+ // Return the word size of the object file.
+ int
+ elfsize() const
+ { return this->do_elfsize(); }
+
+ // Return TRUE if this is a big-endian object file.
+ bool
+ is_big_endian() const
+ { return this->do_is_big_endian(); }
+
protected:
// The output section to be used for each input section, indexed by
// the input section number. The output section is NULL if the
do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
unsigned int got_offset) = 0;
+ // Return whether local symbol SYMNDX is a TLS symbol.
+ virtual bool
+ do_local_is_tls(unsigned int symndx) const = 0;
+
// Return the number of local symbols--implemented by child class.
virtual unsigned int
do_local_symbol_count() const = 0;
return this->reloc_bases_[symndx] + counter;
}
+ // Return the word size of the object file--
+ // implemented by child class.
+ virtual int
+ do_elfsize() const = 0;
+
+ // Return TRUE if this is a big-endian object file--
+ // implemented by child class.
+ virtual bool
+ do_is_big_endian() const = 0;
+
private:
// Mapping from input sections to output section.
Output_sections output_sections_;
std::vector<Symbol*> vec_;
};
-// Type for mapping section index to uncompressed size and contents.
-
-struct Compressed_section_info
-{
- section_size_type size;
- const unsigned char* contents;
-};
-typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
-
// Abstract base class for a regular object file, either a real object file
// or an incremental (unchanged) object. This is size and endian specific.
section_offsets()
{ return this->section_offsets_; }
+ // Get the address of an output section.
+ uint64_t
+ do_output_section_address(unsigned int shndx);
+
// Get the offset of a section.
uint64_t
do_output_section_offset(unsigned int shndx) const
}
}
+ // Return the word size of the object file.
+ virtual int
+ do_elfsize() const
+ { return size; }
+
+ // Return TRUE if this is a big-endian object file.
+ virtual bool
+ do_is_big_endian() const
+ { return big_endian; }
+
private:
// The GOT offsets of local symbols. This map also stores GOT offsets
// for tp-relative offsets for TLS symbols.
void
set_local_plt_offset(unsigned int symndx, unsigned int plt_offset);
+ // Adjust this local symbol value. Return false if the symbol
+ // should be discarded from the output file.
+ bool
+ adjust_local_symbol(Symbol_value<size>* lv) const
+ { return this->do_adjust_local_symbol(lv); }
+
// Return the name of the symbol that spans the given offset in the
// specified section in this object. This is used only for error
// messages and is not particularly efficient.
Symbol_value<size>* lv_out,
const Symbol_table* symtab);
+ // Return true if the layout for this object was deferred.
+ bool is_deferred_layout() const
+ { return this->is_deferred_layout_; }
+
protected:
typedef typename Sized_relobj<size, big_endian>::Output_sections
Output_sections;
void
do_read_symbols(Read_symbols_data*);
+ // Read the symbols. This is common code for all target-specific
+ // overrides of do_read_symbols.
+ void
+ base_read_symbols(Read_symbols_data*);
+
// Return the value of a local symbol.
uint64_t
do_local_symbol_value(unsigned int symndx, uint64_t addend) const
unsigned int
do_local_plt_offset(unsigned int symndx) const;
+ // Return whether local symbol SYMNDX is a TLS symbol.
+ bool
+ do_local_is_tls(unsigned int symndx) const
+ { return this->local_symbol(symndx)->is_tls_symbol(); }
+
// Return the number of local symbols.
unsigned int
do_local_symbol_count() const
// Get the name of a section.
std::string
- do_section_name(unsigned int shndx)
+ do_section_name(unsigned int shndx) const
{ return this->elf_file_.section_name(shndx); }
// Return the location of the contents of a section.
typedef std::vector<View_size> Views;
+ // Stash away info for a number of special sections.
+ // Return true if any of the sections found require local symbols to be read.
+ virtual bool
+ do_find_special_sections(Read_symbols_data* sd);
+
// This may be overriden by a child class.
virtual void
do_relocate_sections(const Symbol_table* symtab, const Layout* layout,
const unsigned char* pshdrs, Output_file* of,
Views* pviews);
+ // Adjust this local symbol value. Return false if the symbol
+ // should be discarded from the output file.
+ virtual bool
+ do_adjust_local_symbol(Symbol_value<size>*) const
+ { return true; }
+
// Allow a child to set output local symbol count.
void
set_output_local_symbol_count(unsigned int value)
{ this->output_local_symbol_count_ = value; }
- // Return TRUE if the section is a compressed debug section, and set
- // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
- bool
- do_section_is_compressed(unsigned int shndx,
- section_size_type* uncompressed_size) const
- {
- if (this->compressed_sections_ == NULL)
- return false;
- Compressed_section_map::const_iterator p =
- this->compressed_sections_->find(shndx);
- if (p != this->compressed_sections_->end())
- {
- if (uncompressed_size != NULL)
- *uncompressed_size = p->second.size;
- return true;
- }
- return false;
- }
-
- // Return a view of the uncompressed contents of a section. Set *PLEN
- // to the size. Set *IS_NEW to true if the contents need to be deleted
- // by the caller.
- const unsigned char*
- do_decompressed_section_contents(unsigned int shndx,
- section_size_type* plen,
- bool* is_new);
-
- // Discard any buffers of decompressed sections. This is done
- // at the end of the Add_symbols task.
- void
- do_discard_decompressed_sections();
-
private:
// For convenience.
typedef Sized_relobj_file<size, big_endian> This;
const Read_relocs_data::Relocs_list::iterator&,
Relocatable_relocs*);
- // Emit the relocs for --emit-relocs.
- void
- emit_relocs(const Relocate_info<size, big_endian>*, unsigned int,
- unsigned int sh_type, const unsigned char* prelocs,
- size_t reloc_count, Output_section*, Address output_offset,
- unsigned char* view, Address address,
- section_size_type view_size,
- unsigned char* reloc_view, section_size_type reloc_view_size);
-
- // Emit the relocs for --emit-relocs, templatized on the type of the
- // relocation section.
- template<int sh_type>
- void
- emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int,
- const unsigned char* prelocs, size_t reloc_count,
- Output_section*, Address output_offset,
- unsigned char* view, Address address,
- section_size_type view_size,
- unsigned char* reloc_view,
- section_size_type reloc_view_size);
-
// Scan the input relocations for --incremental.
void
incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&);
// If this object has a GNU style .eh_frame section that is discarded in
// output, record the index here. Otherwise it is -1U.
unsigned int discarded_eh_frame_shndx_;
+ // True if the layout of this object was deferred, waiting for plugin
+ // replacement files.
+ bool is_deferred_layout_;
// The list of sections whose layout was deferred.
std::vector<Deferred_layout> deferred_layout_;
// The list of relocation sections whose layout was deferred.
std::vector<Deferred_layout> deferred_layout_relocs_;
- // For compressed debug sections, map section index to uncompressed size
- // and contents.
- Compressed_section_map* compressed_sections_;
};
// A class to manage the list of all objects.
// This is used to represent a section in an object and is used as the
// key type for various section maps.
-typedef std::pair<Object*, unsigned int> Section_id;
+typedef std::pair<Relobj*, unsigned int> Section_id;
// This is similar to Section_id but is used when the section
// pointers are const.
-typedef std::pair<const Object*, unsigned int> Const_section_id;
+typedef std::pair<const Relobj*, unsigned int> Const_section_id;
// The hash value is based on the address of an object in memory during
// linking. It is okay to use this for looking up sections but never use
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