// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
-// Free Software Foundation, Inc.
+// Copyright (C) 2006-2016 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;
{
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_;
};
+// The Local_got_entry_key used to index the GOT offsets for local
+// non-TLS symbols, and tp-relative offsets for TLS symbols.
+
+class Local_got_entry_key
+{
+ public:
+ Local_got_entry_key(unsigned int symndx, uint64_t addend)
+ : symndx_(symndx), addend_(addend)
+ {}
+
+ // Whether this equals to another Local_got_entry_key.
+ bool
+ eq(const Local_got_entry_key& key) const
+ {
+ return (this->symndx_ == key.symndx_ && this->addend_ == key.addend_);
+ }
+
+ // Compute a hash value for this using 64-bit FNV-1a hash.
+ size_t
+ hash_value() const
+ {
+ uint64_t h = 14695981039346656037ULL; // FNV offset basis.
+ uint64_t prime = 1099511628211ULL;
+ h = (h ^ static_cast<uint64_t>(this->symndx_)) * prime;
+ h = (h ^ static_cast<uint64_t>(this->addend_)) * prime;
+ return h;
+ }
+
+ // Functors for associative containers.
+ struct equal_to
+ {
+ bool
+ operator()(const Local_got_entry_key& key1,
+ const Local_got_entry_key& key2) const
+ { return key1.eq(key2); }
+ };
+
+ struct hash
+ {
+ size_t
+ operator()(const Local_got_entry_key& key) const
+ { return key.hash_value(); }
+ };
+
+ private:
+ // The local symbol index.
+ unsigned int symndx_;
+ // The addend.
+ uint64_t addend_;
+};
+
+// Type for mapping section index to uncompressed size and contents.
+
+struct Compressed_section_info
+{
+ section_size_type size;
+ elfcpp::Elf_Xword flag;
+ 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)
{
is_dynamic() const
{ return this->is_dynamic_; }
+ // Return the word size of the object file.
+ virtual int elfsize() const = 0;
+
+ // Return TRUE if this is a big-endian object file.
+ virtual bool is_big_endian() const = 0;
+
// Return whether this object is needed--true if it is a dynamic
// object which defines some symbol referenced by a regular object.
// We keep the flag here rather than in Dynobj for convenience when
// 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_as_needed()
{ this->as_needed_ = true; }
+ // Clear flag that this object was linked with --as-needed.
+ void
+ clear_as_needed()
+ { this->as_needed_ = false; }
+
// Return whether this object was linked with --as-needed.
bool
as_needed() const
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_incremental_reloc_count(unsigned int symndx) const
{ return this->do_get_incremental_reloc_count(symndx); }
+ // Return the output view for section SHNDX.
+ unsigned char*
+ get_output_view(unsigned int shndx, section_size_type* plen) const
+ { return this->do_get_output_view(shndx, plen); }
+
protected:
// Returns NULL for Objects that are not dynamic objects. This method
// is overridden in the Dynobj class.
// 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
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(); }
+ // Return the output view for a section.
+ virtual unsigned char*
+ do_get_output_view(unsigned int, section_size_type*) 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.
// GOT_TYPE.
bool
local_has_got_offset(unsigned int symndx, unsigned int got_type) const
- { return this->do_local_has_got_offset(symndx, got_type); }
+ { return this->do_local_has_got_offset(symndx, got_type, 0); }
+
+ // Return whether the local symbol SYMNDX plus ADDEND has a GOT offset
+ // of type GOT_TYPE.
+ bool
+ local_has_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const
+ { return this->do_local_has_got_offset(symndx, got_type, addend); }
// Return the GOT offset of type GOT_TYPE of the local symbol
// SYMNDX. It is an error to call this if the symbol does not have
// a GOT offset of the specified type.
unsigned int
local_got_offset(unsigned int symndx, unsigned int got_type) const
- { return this->do_local_got_offset(symndx, got_type); }
+ { return this->do_local_got_offset(symndx, got_type, 0); }
+
+ // Return the GOT offset of type GOT_TYPE of the local symbol
+ // SYMNDX plus ADDEND. It is an error to call this if the symbol
+ // does not have a GOT offset of the specified type.
+ unsigned int
+ local_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const
+ { return this->do_local_got_offset(symndx, got_type, addend); }
// Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
// to GOT_OFFSET.
void
set_local_got_offset(unsigned int symndx, unsigned int got_type,
unsigned int got_offset)
- { this->do_set_local_got_offset(symndx, got_type, got_offset); }
+ { this->do_set_local_got_offset(symndx, got_type, got_offset, 0); }
+
+ // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
+ // plus ADDEND to GOT_OFFSET.
+ void
+ set_local_got_offset(unsigned int symndx, unsigned int got_type,
+ unsigned int got_offset, uint64_t addend)
+ { this->do_set_local_got_offset(symndx, got_type, got_offset, addend); }
// Return whether the local symbol SYMNDX is a TLS symbol.
bool
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
virtual unsigned int
do_local_plt_offset(unsigned int symndx) const = 0;
- // Return whether a local symbol has a GOT offset of a given type.
+ // Return whether a local symbol plus addend has a GOT offset
+ // of a given type.
virtual bool
do_local_has_got_offset(unsigned int symndx,
- unsigned int got_type) const = 0;
+ unsigned int got_type, uint64_t addend) const = 0;
- // Return the GOT offset of a given type of a local symbol.
+ // Return the GOT offset of a given type of a local symbol plus addend.
virtual unsigned int
- do_local_got_offset(unsigned int symndx, unsigned int got_type) const = 0;
+ do_local_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const = 0;
- // Set the GOT offset with a given type for a local symbol.
+ // Set the GOT offset with a given type for a local symbol plus addend.
virtual void
do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
- unsigned int got_offset) = 0;
+ unsigned int got_offset, uint64_t addend) = 0;
// Return whether local symbol SYMNDX is a TLS symbol.
virtual bool
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
: convert_types<Address, uint64_t>(off));
}
- // Return whether the local symbol SYMNDX has a GOT offset of type
- // GOT_TYPE.
+ // Return whether the local symbol SYMNDX plus ADDEND has a GOT offset
+ // of type GOT_TYPE.
bool
- do_local_has_got_offset(unsigned int symndx, unsigned int got_type) const
+ do_local_has_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const
{
+ Local_got_entry_key key(symndx, addend);
Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
+ this->local_got_offsets_.find(key);
return (p != this->local_got_offsets_.end()
&& p->second->get_offset(got_type) != -1U);
}
// Return the GOT offset of type GOT_TYPE of the local symbol
- // SYMNDX.
+ // SYMNDX plus ADDEND.
unsigned int
- do_local_got_offset(unsigned int symndx, unsigned int got_type) const
+ do_local_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const
{
+ Local_got_entry_key key(symndx, addend);
Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
+ this->local_got_offsets_.find(key);
gold_assert(p != this->local_got_offsets_.end());
unsigned int off = p->second->get_offset(got_type);
gold_assert(off != -1U);
}
// Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
- // to GOT_OFFSET.
+ // plus ADDEND to GOT_OFFSET.
void
do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
- unsigned int got_offset)
+ unsigned int got_offset, uint64_t addend)
{
+ Local_got_entry_key key(symndx, addend);
Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
+ this->local_got_offsets_.find(key);
if (p != this->local_got_offsets_.end())
p->second->set_offset(got_type, got_offset);
else
{
Got_offset_list* g = new Got_offset_list(got_type, got_offset);
std::pair<Local_got_offsets::iterator, bool> ins =
- this->local_got_offsets_.insert(std::make_pair(symndx, g));
+ this->local_got_offsets_.insert(std::make_pair(key, g));
gold_assert(ins.second);
}
}
private:
// The GOT offsets of local symbols. This map also stores GOT offsets
// for tp-relative offsets for TLS symbols.
- typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets;
+ typedef Unordered_map<Local_got_entry_key, Got_offset_list*,
+ Local_got_entry_key::hash,
+ Local_got_entry_key::equal_to> Local_got_offsets;
// GOT offsets for local non-TLS symbols, and tp-relative offsets
- // for TLS symbols, indexed by symbol number.
+ // for TLS symbols, indexed by local got entry key class.
Local_got_offsets local_got_offsets_;
// For each input section, the offset of the input section in its
// output section. This is INVALID_ADDRESS if the input section requires a
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
// 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.
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();
+ // Return the output view for a section.
+ unsigned char*
+ do_get_output_view(unsigned int, section_size_type*) const;
private:
// For convenience.
unsigned int sh_type, unsigned int shndx,
const unsigned char* prelocs, size_t reloc_count,
unsigned char* view, section_size_type view_size,
- Reloc_symbol_changes** reloc_map);
+ Reloc_symbol_changes** reloc_map,
+ const Sized_target<size, big_endian>* target);
template<int sh_type>
void
unsigned int shndx, const unsigned char* prelocs,
size_t reloc_count, unsigned char* view,
section_size_type view_size,
- Reloc_symbol_changes** reloc_map);
+ Reloc_symbol_changes** reloc_map,
+ const Sized_target<size, big_endian>* target);
// Find all functions in a section.
void
// 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_;
+ // Pointer to the list of output views; valid only during do_relocate().
+ const Views* output_views_;
};
// A class to manage the list of all objects.
// The list of dynamic objects included in the link.
Dynobj_list dynobj_list_;
// SONAMEs that we have seen.
- Unordered_set<std::string> sonames_;
+ Unordered_map<std::string, Object*> sonames_;
// Manage cross-references if requested.
Cref* cref_;
};
unsigned int reloc_shndx;
// Section header of relocation section.
const unsigned char* reloc_shdr;
+ // Info about how relocs should be handled
+ Relocatable_relocs* rr;
// Section index of section being relocated.
unsigned int data_shndx;
// Section header of data section.
// 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
projects / deliverable / binutils-gdb.git / blobdiff