// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class Task;
class Cref;
class Layout;
+class Kept_section;
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
Symtab_xindex symtab_xindex_;
};
+// A GOT offset list. A symbol may have more than one GOT offset
+// (e.g., when mixing modules compiled with two different TLS models),
+// but will usually have at most one. GOT_TYPE identifies the type of
+// GOT entry; its values are specific to each target.
+
+class Got_offset_list
+{
+ public:
+ Got_offset_list()
+ : got_type_(-1U), got_offset_(0), got_next_(NULL)
+ { }
+
+ Got_offset_list(unsigned int got_type, unsigned int got_offset)
+ : got_type_(got_type), got_offset_(got_offset), got_next_(NULL)
+ { }
+
+ ~Got_offset_list()
+ {
+ if (this->got_next_ != NULL)
+ {
+ delete this->got_next_;
+ this->got_next_ = NULL;
+ }
+ }
+
+ // Initialize the fields to their default values.
+ void
+ init()
+ {
+ this->got_type_ = -1U;
+ this->got_offset_ = 0;
+ this->got_next_ = NULL;
+ }
+
+ // Set the offset for the GOT entry of type GOT_TYPE.
+ void
+ set_offset(unsigned int got_type, unsigned int got_offset)
+ {
+ if (this->got_type_ == -1U)
+ {
+ this->got_type_ = got_type;
+ this->got_offset_ = got_offset;
+ }
+ else
+ {
+ for (Got_offset_list* g = this; g != NULL; g = g->got_next_)
+ {
+ if (g->got_type_ == got_type)
+ {
+ g->got_offset_ = got_offset;
+ return;
+ }
+ }
+ Got_offset_list* g = new Got_offset_list(got_type, got_offset);
+ g->got_next_ = this->got_next_;
+ this->got_next_ = g;
+ }
+ }
+
+ // Return the offset for a GOT entry of type GOT_TYPE.
+ unsigned int
+ get_offset(unsigned int got_type) const
+ {
+ for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
+ {
+ if (g->got_type_ == got_type)
+ return g->got_offset_;
+ }
+ return -1U;
+ }
+
+ // Return a pointer to the list, or NULL if the list is empty.
+ const Got_offset_list*
+ get_list() const
+ {
+ if (this->got_type_ == -1U)
+ return NULL;
+ return this;
+ }
+
+ // Abstract visitor class for iterating over GOT offsets.
+ class Visitor
+ {
+ public:
+ Visitor()
+ { }
+
+ virtual
+ ~Visitor()
+ { }
+
+ virtual void
+ visit(unsigned int, unsigned int) = 0;
+ };
+
+ // Loop over all GOT offset entries, calling a visitor class V for each.
+ void
+ for_all_got_offsets(Visitor* v) const
+ {
+ if (this->got_type_ == -1U)
+ return;
+ for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
+ v->visit(g->got_type_, g->got_offset_);
+ }
+
+ private:
+ unsigned int got_type_;
+ unsigned int got_offset_;
+ 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;
+ uint64_t addralign;
+ 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).
off_t offset = 0)
: 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), xindex_(NULL)
- { input_file->file().add_object(); }
+ has_no_split_stack_(false), no_export_(false),
+ is_in_system_directory_(false), as_needed_(false), xindex_(NULL),
+ compressed_sections_(NULL)
+ {
+ if (input_file != NULL)
+ {
+ input_file->file().add_object();
+ this->is_in_system_directory_ = input_file->is_in_system_directory();
+ this->as_needed_ = input_file->options().as_needed();
+ }
+ }
virtual ~Object()
- { this->input_file_->file().remove_object(); }
+ {
+ if (this->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_; }
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
has_no_split_stack() const
{ return this->has_no_split_stack_; }
+ // Returns NULL for Objects that are not dynamic objects. This method
+ // is overridden in the Dynobj class.
+ Dynobj*
+ dynobj()
+ { return this->do_dynobj(); }
+
// Returns NULL for Objects that are not plugin objects. This method
// is overridden in the Pluginobj class.
Pluginobj*
// Get the file. We pass on const-ness.
Input_file*
input_file()
- { return this->input_file_; }
+ {
+ gold_assert(this->input_file_ != NULL);
+ return this->input_file_;
+ }
const Input_file*
input_file() const
- { return this->input_file_; }
+ {
+ gold_assert(this->input_file_ != NULL);
+ return this->input_file_;
+ }
// Lock the underlying file.
void
lock(const Task* t)
- { this->input_file()->file().lock(t); }
+ {
+ if (this->input_file_ != NULL)
+ this->input_file_->file().lock(t);
+ }
// Unlock the underlying file.
void
unlock(const Task* t)
- { this->input_file()->file().unlock(t); }
+ {
+ if (this->input_file_ != NULL)
+ this->input_file()->file().unlock(t);
+ }
// Return whether the underlying file is locked.
bool
is_locked() const
- { return this->input_file()->file().is_locked(); }
+ { return this->input_file_ != NULL && this->input_file_->file().is_locked(); }
// Return the token, so that the task can be queued.
Task_token*
token()
- { return this->input_file()->file().token(); }
+ {
+ if (this->input_file_ == NULL)
+ return NULL;
+ return this->input_file()->file().token();
+ }
// Release the underlying file.
void
release()
- { this->input_file_->file().release(); }
+ {
+ if (this->input_file_ != NULL)
+ this->input_file()->file().release();
+ }
// Return whether we should just read symbols from this file.
bool
just_symbols() const
{ return this->input_file()->just_symbols(); }
+ // Return whether this is an incremental object.
+ bool
+ is_incremental() const
+ { return this->do_is_incremental(); }
+
+ // Return the last modified time of the file.
+ Timespec
+ get_mtime()
+ { return this->do_get_mtime(); }
+
// Get the number of sections.
unsigned int
shnum() const
// 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.
Read_symbols_data* sd, std::string* why)
{ return this->do_should_include_member(symtab, layout, sd, why); }
+ // Iterate over global symbols, calling a visitor class V for each.
+ void
+ for_all_global_symbols(Read_symbols_data* sd,
+ Library_base::Symbol_visitor_base* v)
+ { return this->do_for_all_global_symbols(sd, v); }
+
+ // Iterate over local symbols, calling a visitor class V for each GOT offset
+ // associated with a local symbol.
+ void
+ for_all_local_got_entries(Got_offset_list::Visitor* v) const
+ { this->do_for_all_local_got_entries(v); }
+
// Functions and types for the elfcpp::Elf_file interface. This
// permit us to use Object as the File template parameter for
// elfcpp::Elf_file.
// Stop caching views in the underlying file.
void
clear_view_cache_marks()
- { this->input_file()->file().clear_view_cache_marks(); }
+ {
+ if (this->input_file_ != NULL)
+ this->input_file_->file().clear_view_cache_marks();
+ }
// Get the number of global symbols defined by this object, and the
// number of the symbols whose final definition came from this
get_global_symbols() const
{ return this->do_get_global_symbols(); }
+ // Set flag that this object was found in a system directory.
+ void
+ set_is_in_system_directory()
+ { this->is_in_system_directory_ = true; }
+
// 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 this->is_in_system_directory_; }
+
+ // Set flag that this object was linked with --as-needed.
+ void
+ 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
+ { return this->as_needed_; }
// Return whether we found this object by searching a directory.
bool
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); }
+ section_size_type* uncompressed_size,
+ elfcpp::Elf_Xword* palign = NULL) 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;
+ if (palign != NULL)
+ *palign = p->second.addralign;
+ 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, uint64_t* palign = NULL);
+
+ // Discard any buffers of decompressed sections. This is done
+ // at the end of the Add_symbols task.
+ void
+ 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.
+ virtual Dynobj*
+ do_dynobj()
+ { return NULL; }
+
// Returns NULL for Objects that are not plugin objects. This method
// is overridden in the Pluginobj class.
virtual Pluginobj*
do_pluginobj()
{ return NULL; }
+ // Return TRUE if this is an incremental (unchanged) input file.
+ // We return FALSE by default; the incremental object classes
+ // override this method.
+ virtual bool
+ do_is_incremental() const
+ { return false; }
+
+ // Return the last modified time of the file. This method may be
+ // overridden for subclasses that don't use an actual file (e.g.,
+ // Incremental objects).
+ virtual Timespec
+ do_get_mtime()
+ { return this->input_file()->file().get_mtime(); }
+
// Read the symbols--implemented by child class.
virtual void
do_read_symbols(Read_symbols_data*) = 0;
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
std::string* why) = 0;
+ // Iterate over global symbols, calling a visitor class V for each.
+ virtual void
+ do_for_all_global_symbols(Read_symbols_data* sd,
+ Library_base::Symbol_visitor_base* v) = 0;
+
+ // Iterate over local symbols, calling a visitor class V for each GOT offset
+ // associated with a local symbol.
+ virtual void
+ do_for_all_local_got_entries(Got_offset_list::Visitor* v) const = 0;
+
// Return the location of the contents of a section. Implemented by
// child class.
- virtual Location
- do_section_contents(unsigned int shndx) = 0;
+ virtual const unsigned char*
+ do_section_contents(unsigned int shndx, section_size_type* plen,
+ bool cache) = 0;
// Get the size of a section--implemented by child class.
virtual uint64_t
// 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
set_shnum(int shnum)
{ this->shnum_ = shnum; }
- // Functions used by both Sized_relobj and Sized_dynobj.
+ // Functions used by both Sized_relobj_file and Sized_dynobj.
// Read the section data into a Read_symbols_data object.
template<int size, bool big_endian>
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)
Symbol_table*);
// If NAME is the name of the special section which indicates that
- // this object was compiled with -fstack-split, mark it accordingly,
+ // this object was compiled with -fsplit-stack, mark it accordingly,
// and return true. Otherwise return false.
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; }
+ // Discard any buffers of decompressed sections. This is done
+ // at the end of the Add_symbols task.
+ virtual void
+ do_discard_decompressed_sections()
+ { }
// Return the index of the first incremental relocation for symbol SYMNDX--
// implemented by child class.
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&);
// True if exclude this object from automatic symbol export.
// This is used only for archive objects.
bool no_export_ : 1;
+ // True if the object was found in a system directory.
+ bool is_in_system_directory_ : 1;
+ // True if the object was linked with --as-needed.
+ 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.
-// The implementation is the template class Sized_relobj.
+// The implementation is the template class Sized_relobj_file.
class Relobj : public Object
{
relocs_must_follow_section_writes_(false),
sd_(NULL),
reloc_counts_(NULL),
- reloc_bases_(NULL)
+ reloc_bases_(NULL),
+ first_dyn_reloc_(0),
+ dyn_reloc_count_(0)
{ }
// During garbage collection, the Read_symbols_data pass for
scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd)
{ return this->do_scan_relocs(symtab, layout, rd); }
+ // Return the value of the local symbol whose index is SYMNDX, plus
+ // ADDEND. ADDEND is passed in so that we can correctly handle the
+ // section symbol for a merge section.
+ uint64_t
+ local_symbol_value(unsigned int symndx, uint64_t addend) const
+ { return this->do_local_symbol_value(symndx, addend); }
+
+ // Return the PLT offset for a local symbol. It is an error to call
+ // this if it doesn't have one.
+ unsigned int
+ local_plt_offset(unsigned int symndx) const
+ { return this->do_local_plt_offset(symndx); }
+
+ // Return whether the local symbol SYMNDX has a GOT offset of type
+ // 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, 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, 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, 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
+ 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->do_local_symbol_count(); }
+ // The number of local symbols in the output symbol table.
+ virtual unsigned int
+ output_local_symbol_count() const
+ { return this->do_output_local_symbol_count(); }
+
+ // The file offset for local symbols in the output symbol table.
+ virtual off_t
+ local_symbol_offset() const
+ { return this->do_local_symbol_offset(); }
+
// Initial local symbol processing: count the number of local symbols
// in the output symbol table and dynamic symbol table; add local symbol
// names to *POOL and *DYNPOOL.
set_local_dynsym_offset(off_t off)
{ return this->do_set_local_dynsym_offset(off); }
+ // Record a dynamic relocation against an input section from this object.
+ void
+ add_dyn_reloc(unsigned int index)
+ {
+ if (this->dyn_reloc_count_ == 0)
+ this->first_dyn_reloc_ = index;
+ ++this->dyn_reloc_count_;
+ }
+
+ // Return the index of the first dynamic relocation.
+ unsigned int
+ first_dyn_reloc() const
+ { return this->first_dyn_reloc_; }
+
+ // Return the count of dynamic relocations.
+ unsigned int
+ dyn_reloc_count() const
+ { return this->dyn_reloc_count_; }
+
// Relocate the input sections and write out the local symbols.
void
relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of)
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]; }
- protected:
+ // 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
// input section is to be discarded.
virtual void
do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0;
+ // Return the value of a local symbol.
+ virtual uint64_t
+ do_local_symbol_value(unsigned int symndx, uint64_t addend) const = 0;
+
+ // Return the PLT offset of a local symbol.
+ virtual unsigned int
+ do_local_plt_offset(unsigned int symndx) const = 0;
+
+ // 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, uint64_t addend) const = 0;
+
+ // 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,
+ uint64_t addend) const = 0;
+
+ // 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, uint64_t addend) = 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 the number of output local symbols--implemented by child class.
+ virtual unsigned int
+ do_output_local_symbol_count() const = 0;
+
+ // Return the file offset for local symbols--implemented by child class.
+ virtual off_t
+ do_local_symbol_offset() const = 0;
+
// Count local symbols--implemented by child class.
virtual void
do_count_local_symbols(Stringpool_template<char>*,
// Finalize the incremental relocation information.
void
- finalize_incremental_relocs(Layout* layout);
+ finalize_incremental_relocs(Layout* layout, bool clear_counts);
// Return the index of the next relocation to be written for global symbol
// SYMNDX. Only valid after finalize_incremental_relocs() has been called.
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_;
unsigned int* reloc_counts_;
// Per-symbol base indexes of relocations, for incremental links.
unsigned int* reloc_bases_;
+ // Index of the first dynamic relocation for this object.
+ unsigned int first_dyn_reloc_;
+ // Count of dynamic relocations for this object.
+ unsigned int dyn_reloc_count_;
};
// This class is used to handle relocations against a section symbol
is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true)
{ this->u_.value = 0; }
+ ~Symbol_value()
+ {
+ if (!this->has_output_value_)
+ delete this->u_.merged_symbol_value;
+ }
+
// Get the value of this symbol. OBJECT is the object in which this
// symbol is defined, and ADDEND is an addend to add to the value.
template<bool big_endian>
Value
- value(const Sized_relobj<size, big_endian>* object, Value addend) const
+ value(const Sized_relobj_file<size, big_endian>* object, Value addend) const
{
if (this->has_output_value_)
return this->u_.value + addend;
is_ifunc_symbol() const
{ return this->is_ifunc_symbol_; }
+ // Return true if this has output value.
+ bool
+ has_output_value() const
+ { return this->has_output_value_; }
+
private:
// The index of this local symbol in the output symbol table. This
// will be 0 if no value has been assigned yet, and the symbol may
} u_;
};
-// A GOT offset list. A symbol may have more than one GOT offset
-// (e.g., when mixing modules compiled with two different TLS models),
-// but will usually have at most one. GOT_TYPE identifies the type of
-// GOT entry; its values are specific to each target.
+// This type is used to modify relocations for -fsplit-stack. It is
+// indexed by relocation index, and means that the relocation at that
+// index should use the symbol from the vector, rather than the one
+// indicated by the relocation.
-class Got_offset_list
+class Reloc_symbol_changes
{
public:
- Got_offset_list()
- : got_type_(-1U), got_offset_(0), got_next_(NULL)
+ Reloc_symbol_changes(size_t count)
+ : vec_(count, NULL)
{ }
- Got_offset_list(unsigned int got_type, unsigned int got_offset)
- : got_type_(got_type), got_offset_(got_offset), got_next_(NULL)
+ void
+ set(size_t i, Symbol* sym)
+ { this->vec_[i] = sym; }
+
+ const Symbol*
+ operator[](size_t i) const
+ { return this->vec_[i]; }
+
+ private:
+ std::vector<Symbol*> vec_;
+};
+
+// Abstract base class for a regular object file, either a real object file
+// or an incremental (unchanged) object. This is size and endian specific.
+
+template<int size, bool big_endian>
+class Sized_relobj : public Relobj
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ typedef Relobj::Symbols Symbols;
+
+ static const Address invalid_address = static_cast<Address>(0) - 1;
+
+ Sized_relobj(const std::string& name, Input_file* input_file)
+ : Relobj(name, input_file), local_got_offsets_(), section_offsets_()
{ }
- ~Got_offset_list()
- {
- if (this->got_next_ != NULL)
- {
- delete this->got_next_;
- this->got_next_ = NULL;
- }
+ Sized_relobj(const std::string& name, Input_file* input_file,
+ off_t offset)
+ : Relobj(name, input_file, offset), local_got_offsets_(), section_offsets_()
+ { }
+
+ ~Sized_relobj()
+ { }
+
+ // If this is a regular object, return a pointer to the Sized_relobj_file
+ // object. Otherwise, return NULL.
+ virtual Sized_relobj_file<size, big_endian>*
+ sized_relobj()
+ { return NULL; }
+
+ const virtual Sized_relobj_file<size, big_endian>*
+ sized_relobj() const
+ { return NULL; }
+
+ // 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; }
+
+ // Get the offset of input section SHNDX within its output section.
+ // This is -1 if the input section requires a special mapping, such
+ // as a merge section. The output section can be found in the
+ // output_sections_ field of the parent class Relobj.
+ Address
+ get_output_section_offset(unsigned int shndx) const
+ {
+ gold_assert(shndx < this->section_offsets_.size());
+ return this->section_offsets_[shndx];
}
- // Initialize the fields to their default values.
+ // Iterate over local symbols, calling a visitor class V for each GOT offset
+ // associated with a local symbol.
void
- init()
+ do_for_all_local_got_entries(Got_offset_list::Visitor* v) const;
+
+ protected:
+ typedef Relobj::Output_sections Output_sections;
+
+ // Clear the local symbol information.
+ void
+ clear_got_offsets()
+ { this->local_got_offsets_.clear(); }
+
+ // Return the vector of section offsets.
+ std::vector<Address>&
+ 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
{
- this->got_type_ = -1U;
- this->got_offset_ = 0;
- this->got_next_ = NULL;
+ Address off = this->get_output_section_offset(shndx);
+ if (off == invalid_address)
+ return -1ULL;
+ return off;
}
- // Set the offset for the GOT entry of type GOT_TYPE.
+ // Set the offset of a section.
void
- set_offset(unsigned int got_type, unsigned int got_offset)
+ do_set_section_offset(unsigned int shndx, uint64_t off)
{
- if (this->got_type_ == -1U)
- {
- this->got_type_ = got_type;
- this->got_offset_ = got_offset;
- }
- else
- {
- for (Got_offset_list* g = this; g != NULL; g = g->got_next_)
- {
- if (g->got_type_ == got_type)
- {
- g->got_offset_ = got_offset;
- return;
- }
- }
- Got_offset_list* g = new Got_offset_list(got_type, got_offset);
- g->got_next_ = this->got_next_;
- this->got_next_ = g;
- }
+ gold_assert(shndx < this->section_offsets_.size());
+ this->section_offsets_[shndx] =
+ (off == static_cast<uint64_t>(-1)
+ ? invalid_address
+ : convert_types<Address, uint64_t>(off));
}
- // Return the offset for a GOT entry of type GOT_TYPE.
- unsigned int
- get_offset(unsigned int got_type) const
+ // 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,
+ uint64_t addend) const
{
- for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
- {
- if (g->got_type_ == got_type)
- return g->got_offset_;
- }
- return -1U;
+ Local_got_entry_key key(symndx, addend);
+ Local_got_offsets::const_iterator p =
+ this->local_got_offsets_.find(key);
+ return (p != this->local_got_offsets_.end()
+ && p->second->get_offset(got_type) != -1U);
}
- // Return a pointer to the list, or NULL if the list is empty.
- const Got_offset_list*
- get_list() const
+ // Return the GOT offset of type GOT_TYPE of the local symbol
+ // SYMNDX plus ADDEND.
+ unsigned int
+ do_local_got_offset(unsigned int symndx, unsigned int got_type,
+ uint64_t addend) const
{
- if (this->got_type_ == -1U)
- return NULL;
- return this;
+ Local_got_entry_key key(symndx, addend);
+ Local_got_offsets::const_iterator p =
+ 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);
+ return off;
}
- // Loop over all GOT offset entries, applying the function F to each.
- template<typename F>
+ // Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
+ // plus ADDEND to GOT_OFFSET.
void
- for_all_got_offsets(F f) const
+ do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
+ unsigned int got_offset, uint64_t addend)
{
- if (this->got_type_ == -1U)
- return;
- for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
- f(g->got_type_, g->got_offset_);
+ Local_got_entry_key key(symndx, addend);
+ Local_got_offsets::const_iterator p =
+ 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(key, g));
+ gold_assert(ins.second);
+ }
}
- private:
- unsigned int got_type_;
- unsigned int got_offset_;
- Got_offset_list* got_next_;
-};
-
-// This type is used to modify relocations for -fsplit-stack. It is
-// indexed by relocation index, and means that the relocation at that
-// index should use the symbol from the vector, rather than the one
-// indicated by the relocation.
-
-class Reloc_symbol_changes
-{
- public:
- Reloc_symbol_changes(size_t count)
- : vec_(count, NULL)
- { }
-
- void
- set(size_t i, Symbol* sym)
- { this->vec_[i] = sym; }
+ // Return the word size of the object file.
+ virtual int
+ do_elfsize() const
+ { return size; }
- const Symbol*
- operator[](size_t i) const
- { return this->vec_[i]; }
+ // Return TRUE if this is a big-endian object file.
+ virtual bool
+ do_is_big_endian() const
+ { return big_endian; }
private:
- std::vector<Symbol*> vec_;
-};
-
-// Type for mapping section index to uncompressed size.
+ // The GOT offsets of local symbols. This map also stores GOT offsets
+ // for tp-relative offsets for TLS symbols.
+ typedef Unordered_map<Local_got_entry_key, Got_offset_list*,
+ Local_got_entry_key::hash,
+ Local_got_entry_key::equal_to> Local_got_offsets;
-typedef std::map<unsigned int, section_size_type> Compressed_section_map;
+ // GOT offsets for local non-TLS symbols, and tp-relative offsets
+ // 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
+ // special mapping.
+ std::vector<Address> section_offsets_;
+};
// A regular object file. This is size and endian specific.
template<int size, bool big_endian>
-class Sized_relobj : public Relobj
+class Sized_relobj_file : public Sized_relobj<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef std::vector<Symbol*> Symbols;
+ typedef typename Sized_relobj<size, big_endian>::Symbols Symbols;
typedef std::vector<Symbol_value<size> > Local_values;
static const Address invalid_address = static_cast<Address>(0) - 1;
- Sized_relobj(const std::string& name, Input_file* input_file, off_t offset,
- const typename elfcpp::Ehdr<size, big_endian>&);
+ enum Compute_final_local_value_status
+ {
+ // No error.
+ CFLV_OK,
+ // An error occurred.
+ CFLV_ERROR,
+ // The local symbol has no output section.
+ CFLV_DISCARDED
+ };
- ~Sized_relobj();
+ Sized_relobj_file(const std::string& name,
+ Input_file* input_file,
+ off_t offset,
+ const typename elfcpp::Ehdr<size, big_endian>&);
- // 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; }
+ ~Sized_relobj_file();
// Set up the object file based on TARGET.
void
setup()
{ this->do_setup(); }
+ // Return a pointer to the Sized_relobj_file object.
+ Sized_relobj_file<size, big_endian>*
+ sized_relobj()
+ { return this; }
+
+ const Sized_relobj_file<size, big_endian>*
+ sized_relobj() const
+ { return this; }
+
+ // Return the ELF file type.
+ int
+ e_type() const
+ { return this->e_type_; }
+
// Return the number of symbols. This is only valid after
// Object::add_symbols has been called.
unsigned int
this->local_values_[sym].set_needs_output_dynsym_entry();
}
- // Return whether the local symbol SYMNDX has a GOT offset.
- // For TLS symbols, the GOT entry will hold its tp-relative offset.
- bool
- local_has_got_offset(unsigned int symndx, unsigned int got_type) const
- {
- Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
- return (p != this->local_got_offsets_.end()
- && p->second->get_offset(got_type) != -1U);
- }
-
- // Return the GOT offset of the local symbol SYMNDX.
- unsigned int
- local_got_offset(unsigned int symndx, unsigned int got_type) const
- {
- Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
- gold_assert(p != this->local_got_offsets_.end());
- unsigned int off = p->second->get_offset(got_type);
- gold_assert(off != -1U);
- return off;
- }
-
- // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET.
- void
- set_local_got_offset(unsigned int symndx, unsigned int got_type,
- unsigned int got_offset)
- {
- Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
- 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));
- gold_assert(ins.second);
- }
- }
-
- // Return the GOT offset list for the local symbol SYMNDX.
- const Got_offset_list*
- local_got_offset_list(unsigned int symndx) const
- {
- Local_got_offsets::const_iterator p =
- this->local_got_offsets_.find(symndx);
- if (p == this->local_got_offsets_.end())
- return NULL;
- return p->second;
- }
-
// Return whether the local symbol SYMNDX has a PLT offset.
bool
local_has_plt_offset(unsigned int symndx) const;
- // Return the PLT offset for a local symbol. It is an error to call
- // this if it doesn't have one.
- unsigned int
- local_plt_offset(unsigned int symndx) const;
-
// Set the PLT offset of the local symbol SYMNDX.
void
set_local_plt_offset(unsigned int symndx, unsigned int plt_offset);
- // Get the offset of input section SHNDX within its output section.
- // This is -1 if the input section requires a special mapping, such
- // as a merge section. The output section can be found in the
- // output_sections_ field of the parent class Relobj.
- Address
- get_output_section_offset(unsigned int shndx) const
- {
- gold_assert(shndx < this->section_offsets_.size());
- return this->section_offsets_[shndx];
- }
+ // 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
// and return its output address. This is used only for relocations in
// debugging sections.
Address
- map_to_kept_section(unsigned int shndx, bool* found) const;
+ map_to_kept_section(unsigned int shndx, std::string& section_name,
+ bool* found) const;
+
+ // Look for a kept section corresponding to the given discarded section,
+ // and return its object file.
+ Relobj*
+ find_kept_section_object(unsigned int shndx, unsigned int* symndx_p) const;
+
+ // Return the name of symbol SYMNDX.
+ const char*
+ get_symbol_name(unsigned int symndx);
+
+ // Compute final local symbol value. R_SYM is the local symbol index.
+ // LV_IN points to a local symbol value containing the input value.
+ // LV_OUT points to a local symbol value storing the final output value,
+ // which must not be a merged symbol value since before calling this
+ // method to avoid memory leak. SYMTAB points to a symbol table.
+ //
+ // The method returns a status code at return. If the return status is
+ // CFLV_OK, *LV_OUT contains the final value. If the return status is
+ // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
+ // *LV_OUT is not modified.
+ Compute_final_local_value_status
+ compute_final_local_value(unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ 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;
+
// Set up.
virtual void
do_setup();
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
+ {
+ const Symbol_value<size>* symval = this->local_symbol(symndx);
+ return symval->value(this, addend);
+ }
+
+ // Return the PLT offset for a local symbol. It is an error to call
+ // this if it doesn't have one.
+ 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
{ return this->local_symbol_count_; }
+ // Return the number of local symbols in the output symbol table.
+ unsigned int
+ do_output_local_symbol_count() const
+ { return this->output_local_symbol_count_; }
+
+ // Return the number of local symbols in the output symbol table.
+ off_t
+ do_local_symbol_offset() const
+ { return this->local_symbol_offset_; }
+
// Lay out the input sections.
void
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
std::string* why);
+ // Iterate over global symbols, calling a visitor class V for each.
+ void
+ do_for_all_global_symbols(Read_symbols_data* sd,
+ Library_base::Symbol_visitor_base* v);
+
// Read the relocs.
void
do_read_relocs(Read_relocs_data*);
// 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.
- Object::Location
- do_section_contents(unsigned int shndx)
- { return this->elf_file_.section_contents(shndx); }
+ const unsigned char*
+ do_section_contents(unsigned int shndx, section_size_type* plen,
+ bool cache)
+ {
+ Object::Location loc(this->elf_file_.section_contents(shndx));
+ *plen = convert_to_section_size_type(loc.data_size);
+ if (*plen == 0)
+ {
+ static const unsigned char empty[1] = { '\0' };
+ return empty;
+ }
+ return this->get_view(loc.file_offset, *plen, true, cache);
+ }
// Return section flags.
uint64_t
do_get_global_symbols() const
{ return &this->symbols_; }
- // Get the offset of a section.
- uint64_t
- do_output_section_offset(unsigned int shndx) const
- {
- Address off = this->get_output_section_offset(shndx);
- if (off == invalid_address)
- return -1ULL;
- return off;
- }
-
- // Set the offset of a section.
- void
- do_set_section_offset(unsigned int shndx, uint64_t off)
- {
- gold_assert(shndx < this->section_offsets_.size());
- this->section_offsets_[shndx] =
- (off == static_cast<uint64_t>(-1)
- ? invalid_address
- : convert_types<Address, uint64_t>(off));
- }
-
// Adjust a section index if necessary.
unsigned int
adjust_shndx(unsigned int shndx)
section_size_type view_size;
bool is_input_output_view;
bool is_postprocessing_view;
+ bool is_ctors_reverse_view;
};
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);
+ // Relocate section data for a range of sections.
+ void
+ relocate_section_range(const Symbol_table* symtab, const Layout* layout,
+ const unsigned char* pshdrs, Output_file* of,
+ Views* pviews, unsigned int start_shndx,
+ unsigned int end_shndx);
+
+ // 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;
- return true;
- }
- return false;
- }
+ // Return the output view for a section.
+ unsigned char*
+ do_get_output_view(unsigned int, section_size_type*) const;
private:
// For convenience.
- typedef Sized_relobj<size, big_endian> This;
+ typedef Sized_relobj_file<size, big_endian> This;
static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
typedef elfcpp::Shdr<size, big_endian> Shdr;
+ typedef elfcpp::Shdr_write<size, big_endian> Shdr_write;
// To keep track of discarded comdat sections, we need to map a member
// section index to the object and section index of the corresponding
// kept section.
struct Kept_comdat_section
{
- Kept_comdat_section(Relobj* a_object, unsigned int a_shndx)
- : object(a_object), shndx(a_shndx)
+ Kept_comdat_section(uint64_t a_sh_size, Kept_section* a_kept_section,
+ unsigned int a_symndx, bool a_is_comdat)
+ : sh_size(a_sh_size), kept_section(a_kept_section),
+ symndx (a_symndx), is_comdat(a_is_comdat)
{ }
- Relobj* object;
- unsigned int shndx;
+ uint64_t sh_size; // Section size
+ Kept_section* kept_section; // Kept section info
+ unsigned int symndx; // Index of key symbol
+ bool is_comdat; // True if comdat group, false if linkonce
};
typedef std::map<unsigned int, Kept_comdat_section>
Kept_comdat_section_table;
// Layout an input section.
void
layout_section(Layout* layout, unsigned int shndx, const char* name,
- typename This::Shdr& shdr, unsigned int reloc_shndx,
- unsigned int reloc_type);
+ const typename This::Shdr& shdr, unsigned int sh_type,
+ unsigned int reloc_shndx, unsigned int reloc_type);
+
+ // Layout an input .eh_frame section.
+ void
+ layout_eh_frame_section(Layout* layout, const unsigned char* symbols_data,
+ section_size_type symbols_size,
+ const unsigned char* symbol_names_data,
+ section_size_type symbol_names_size,
+ unsigned int shndx, const typename This::Shdr&,
+ unsigned int reloc_shndx, unsigned int reloc_type);
+
+ // Layout an input .note.gnu.property section.
+ void
+ layout_gnu_property_section(Layout* layout, unsigned int shndx);
// Write section data to the output file. Record the views and
// sizes in VIEWS for use when relocating.
void
- write_sections(const unsigned char* pshdrs, Output_file*, Views*);
+ write_sections(const Layout*, const unsigned char* pshdrs, Output_file*,
+ Views*);
// Relocate the sections in the output file.
void
Views* pviews)
{ this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); }
+ // Reverse the words in a section. Used for .ctors sections mapped
+ // to .init_array sections.
+ void
+ reverse_words(unsigned char*, section_size_type);
+
// Scan the input relocations for --emit-relocs.
void
emit_relocs_scan(Symbol_table*, Layout*, const unsigned char* plocal_syms,
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&);
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
const Stringpool_template<char>*,
const Stringpool_template<char>*,
Output_symtab_xindex*,
- Output_symtab_xindex*);
-
- // Clear the local symbol information.
- void
- clear_local_symbols()
- {
- this->local_values_.clear();
- this->local_got_offsets_.clear();
- this->local_plt_offsets_.clear();
- }
+ Output_symtab_xindex*,
+ off_t);
// Record a mapping from discarded section SHNDX to the corresponding
// kept section.
void
- set_kept_comdat_section(unsigned int shndx, Relobj* kept_object,
- unsigned int kept_shndx)
+ set_kept_comdat_section(unsigned int shndx, bool is_comdat,
+ unsigned int symndx, uint64_t sh_size,
+ Kept_section* kept_section)
{
- Kept_comdat_section kept(kept_object, kept_shndx);
+ Kept_comdat_section kept(sh_size, kept_section, symndx, is_comdat);
this->kept_comdat_sections_.insert(std::make_pair(shndx, kept));
}
// Find the kept section corresponding to the discarded section
// SHNDX. Return true if found.
bool
- get_kept_comdat_section(unsigned int shndx, Relobj** kept_object,
- unsigned int* kept_shndx) const
+ get_kept_comdat_section(unsigned int shndx, bool* is_comdat,
+ unsigned int *symndx, uint64_t* sh_size,
+ Kept_section** kept_section) const
{
typename Kept_comdat_section_table::const_iterator p =
this->kept_comdat_sections_.find(shndx);
if (p == this->kept_comdat_sections_.end())
return false;
- *kept_object = p->second.object;
- *kept_shndx = p->second.shndx;
+ *is_comdat = p->second.is_comdat;
+ *symndx = p->second.symndx;
+ *sh_size = p->second.sh_size;
+ *kept_section = p->second.kept_section;
return true;
}
- // 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;
+ // Compute final local symbol value. R_SYM is the local symbol index.
+ // LV_IN points to a local symbol value containing the input value.
+ // LV_OUT points to a local symbol value storing the final output value,
+ // which must not be a merged symbol value since before calling this
+ // method to avoid memory leak. RELOCATABLE indicates whether we are
+ // linking a relocatable output. OUT_SECTIONS is an array of output
+ // sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB
+ // points to a symbol table.
+ //
+ // The method returns a status code at return. If the return status is
+ // CFLV_OK, *LV_OUT contains the final value. If the return status is
+ // CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
+ // *LV_OUT is not modified.
+ inline Compute_final_local_value_status
+ compute_final_local_value_internal(unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ bool relocatable,
+ const Output_sections& out_sections,
+ const std::vector<Address>& out_offsets,
+ const Symbol_table* symtab);
// The PLT offsets of local symbols.
typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets;
{
static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
Deferred_layout(unsigned int shndx, const char* name,
+ unsigned int sh_type,
const unsigned char* pshdr,
unsigned int reloc_shndx, unsigned int reloc_type)
- : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx),
+ : name_(name), shndx_(shndx), reloc_shndx_(reloc_shndx),
reloc_type_(reloc_type)
{
+ typename This::Shdr_write shdr(this->shdr_data_);
memcpy(this->shdr_data_, pshdr, shdr_size);
+ shdr.put_sh_type(sh_type);
}
- unsigned int shndx_;
std::string name_;
+ unsigned int shndx_;
unsigned int reloc_shndx_;
unsigned int reloc_type_;
unsigned char shdr_data_[shdr_size];
// General access to the ELF file.
elfcpp::Elf_file<size, big_endian, Object> elf_file_;
+ // Type of ELF file (ET_REL or ET_EXEC). ET_EXEC files are allowed
+ // as input files only for the --just-symbols option.
+ int e_type_;
// Index of SHT_SYMTAB section.
unsigned int symtab_shndx_;
// The number of local symbols.
Symbols symbols_;
// Number of symbols defined in object file itself.
size_t defined_count_;
- // File offset for local symbols.
+ // File offset for local symbols (relative to start of symbol table).
off_t local_symbol_offset_;
- // File offset for local dynamic symbols.
+ // File offset for local dynamic symbols (absolute).
off_t local_dynsym_offset_;
// Values of local symbols.
Local_values local_values_;
- // GOT offsets for local non-TLS symbols, and tp-relative offsets
- // for TLS symbols, indexed by symbol number.
- Local_got_offsets local_got_offsets_;
// PLT offsets for local symbols.
Local_plt_offsets local_plt_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
- // special mapping.
- std::vector<Address> section_offsets_;
// Table mapping discarded comdat sections to corresponding kept sections.
Kept_comdat_section_table kept_comdat_sections_;
// Whether this object has a GNU style .eh_frame section.
bool has_eh_frame_;
- // 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.
- 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_;
};
// Layout.
const Layout* layout;
// Object being relocated.
- Sized_relobj<size, big_endian>* object;
+ Sized_relobj_file<size, big_endian>* object;
// Section index of relocation section.
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