// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
{
class General_options;
+class Task;
+class Cref;
+class Archive;
class Layout;
class Output_section;
class Output_file;
+class Output_symtab_xindex;
+class Pluginobj;
class Dynobj;
class Object_merge_map;
+class Relocatable_relocs;
template<typename Stringpool_char>
class Stringpool_template;
// Section names.
File_view* section_names;
// Size of section name data in bytes.
- off_t section_names_size;
+ section_size_type section_names_size;
// Symbol data.
File_view* symbols;
// Size of symbol data in bytes.
- off_t symbols_size;
+ section_size_type symbols_size;
// Offset of external symbols within symbol data. This structure
// sometimes contains only external symbols, in which case this will
// be zero. Sometimes it contains all symbols.
- off_t external_symbols_offset;
+ section_offset_type external_symbols_offset;
// Symbol names.
File_view* symbol_names;
// Size of symbol name data in bytes.
- off_t symbol_names_size;
+ section_size_type symbol_names_size;
// Version information. This is only used on dynamic objects.
// Version symbol data (from SHT_GNU_versym section).
File_view* versym;
- off_t versym_size;
+ section_size_type versym_size;
// Version definition data (from SHT_GNU_verdef section).
File_view* verdef;
- off_t verdef_size;
+ section_size_type verdef_size;
unsigned int verdef_info;
// Needed version data (from SHT_GNU_verneed section).
File_view* verneed;
- off_t verneed_size;
+ section_size_type verneed_size;
unsigned int verneed_info;
};
Output_section* output_section;
// Whether this section has special handling for offsets.
bool needs_special_offset_handling;
+ // Whether the data section is allocated (has the SHF_ALLOC flag set).
+ bool is_data_section_allocated;
};
// Relocations in an object file. This is read in read_relocs and
File_view* local_symbols;
};
+// The Xindex class manages section indexes for objects with more than
+// 0xff00 sections.
+
+class Xindex
+{
+ public:
+ Xindex(int large_shndx_offset)
+ : large_shndx_offset_(large_shndx_offset), symtab_xindex_()
+ { }
+
+ // Initialize the symtab_xindex_ array, given the object and the
+ // section index of the symbol table to use.
+ template<int size, bool big_endian>
+ void
+ initialize_symtab_xindex(Object*, unsigned int symtab_shndx);
+
+ // Read in the symtab_xindex_ array, given its section index.
+ // PSHDRS may optionally point to the section headers.
+ template<int size, bool big_endian>
+ void
+ read_symtab_xindex(Object*, unsigned int xindex_shndx,
+ const unsigned char* pshdrs);
+
+ // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the
+ // real section index.
+ unsigned int
+ sym_xindex_to_shndx(Object* object, unsigned int symndx);
+
+ private:
+ // The type of the array giving the real section index for symbols
+ // whose st_shndx field holds SHN_XINDEX.
+ typedef std::vector<unsigned int> Symtab_xindex;
+
+ // Adjust a section index if necessary. This should only be called
+ // for ordinary section indexes.
+ unsigned int
+ adjust_shndx(unsigned int shndx)
+ {
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ shndx += this->large_shndx_offset_;
+ return shndx;
+ }
+
+ // Adjust to apply to large section indexes.
+ int large_shndx_offset_;
+ // The data from the SHT_SYMTAB_SHNDX section.
+ Symtab_xindex symtab_xindex_;
+};
+
// 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).
Object(const std::string& name, Input_file* input_file, bool is_dynamic,
off_t offset = 0)
: name_(name), input_file_(input_file), offset_(offset), shnum_(-1U),
- is_dynamic_(is_dynamic), target_(NULL)
- { }
+ is_dynamic_(is_dynamic), target_(NULL), xindex_(NULL)
+ { input_file->file().add_object(); }
virtual ~Object()
- { }
+ { this->input_file_->file().remove_object(); }
// Return the name of the object as we would report it to the tuser.
const std::string&
is_dynamic() const
{ return this->is_dynamic_; }
+ // Returns NULL for Objects that are not plugin objects. This method
+ // is overridden in the Pluginobj class.
+ Pluginobj*
+ pluginobj()
+ { return this->do_pluginobj(); }
+
// Return the target structure associated with this object.
Target*
target() const
// Lock the underlying file.
void
- lock()
- { this->input_file_->file().lock(); }
+ lock(const Task* t)
+ { this->input_file()->file().lock(t); }
// Unlock the underlying file.
void
- unlock()
- { this->input_file_->file().unlock(); }
+ unlock(const Task* t)
+ { 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()->file().is_locked(); }
+
+ // Return the token, so that the task can be queued.
+ Task_token*
+ token()
+ { return this->input_file()->file().token(); }
+
+ // Release the underlying file.
+ void
+ release()
+ { 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 the sized target structure associated with this object.
// This is like the target method but it returns a pointer of
// appropriate checked type.
template<int size, bool big_endian>
Sized_target<size, big_endian>*
- sized_target(ACCEPT_SIZE_ENDIAN_ONLY);
+ sized_target() const;
// Get the number of sections.
unsigned int
// Return a view of the contents of a section. Set *PLEN to the
// size. CACHE is a hint as in File_read::get_view.
const unsigned char*
- section_contents(unsigned int shndx, off_t* plen, bool cache);
+ section_contents(unsigned int shndx, section_size_type* plen, bool cache);
+
+ // Adjust a symbol's section index as needed. SYMNDX is the index
+ // of the symbol and SHNDX is the symbol's section from
+ // get_st_shndx. This returns the section index. It sets
+ // *IS_ORDINARY to indicate whether this is a normal section index,
+ // rather than a special code between SHN_LORESERVE and
+ // SHN_HIRESERVE.
+ unsigned int
+ adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary)
+ {
+ if (shndx < elfcpp::SHN_LORESERVE)
+ *is_ordinary = true;
+ else if (shndx == elfcpp::SHN_XINDEX)
+ {
+ if (this->xindex_ == NULL)
+ this->xindex_ = this->do_initialize_xindex();
+ shndx = this->xindex_->sym_xindex_to_shndx(this, symndx);
+ *is_ordinary = true;
+ }
+ else
+ *is_ordinary = false;
+ return shndx;
+ }
- // Return the name of a section given a section index. This is only
- // used for error messages.
+ // Return the size of a section given a section index.
+ uint64_t
+ section_size(unsigned int shndx)
+ { return this->do_section_size(shndx); }
+
+ // Return the name of a section given a section index.
std::string
section_name(unsigned int shndx)
{ return this->do_section_name(shndx); }
section_flags(unsigned int shndx)
{ return this->do_section_flags(shndx); }
+ // Return the section address given a section index.
+ uint64_t
+ section_address(unsigned int shndx)
+ { return this->do_section_address(shndx); }
+
// Return the section type given a section index.
unsigned int
section_type(unsigned int shndx)
section_info(unsigned int shndx)
{ return this->do_section_info(shndx); }
+ // Return the required section alignment given a section index.
+ uint64_t
+ section_addralign(unsigned int shndx)
+ { return this->do_section_addralign(shndx); }
+
// Read the symbol information.
void
read_symbols(Read_symbols_data* sd)
// Return a View.
View
- view(off_t file_offset, off_t data_size)
- { return View(this->get_view(file_offset, data_size, true)); }
+ view(off_t file_offset, section_size_type data_size)
+ { return View(this->get_view(file_offset, data_size, true, true)); }
// Report an error.
void
off_t file_offset;
off_t data_size;
- Location(off_t fo, off_t ds)
+ Location(off_t fo, section_size_type ds)
: file_offset(fo), data_size(ds)
{ }
};
// Get a View given a Location.
View view(Location loc)
- { return View(this->get_view(loc.file_offset, loc.data_size, true)); }
+ { return View(this->get_view(loc.file_offset, loc.data_size, true, true)); }
+
+ // Get a view into the underlying file.
+ const unsigned char*
+ get_view(off_t start, section_size_type size, bool aligned, bool cache)
+ {
+ return this->input_file()->file().get_view(this->offset_, start, size,
+ aligned, cache);
+ }
+
+ // Get a lasting view into the underlying file.
+ File_view*
+ get_lasting_view(off_t start, section_size_type size, bool aligned,
+ bool cache)
+ {
+ return this->input_file()->file().get_lasting_view(this->offset_, start,
+ size, aligned, cache);
+ }
+
+ // Read data from the underlying file.
+ void
+ read(off_t start, section_size_type size, void* p)
+ { this->input_file()->file().read(start + this->offset_, size, p); }
+
+ // Read multiple data from the underlying file.
+ void
+ read_multiple(const File_read::Read_multiple& rm)
+ { this->input_file()->file().read_multiple(this->offset_, rm); }
+
+ // Stop caching views in the underlying file.
+ void
+ clear_view_cache_marks()
+ { 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
+ // object.
+ void
+ get_global_symbol_counts(const Symbol_table* symtab, size_t* defined,
+ size_t* used) const
+ { this->do_get_global_symbol_counts(symtab, defined, used); }
+
+ // Set the target.
+ void
+ set_target(Target* target)
+ { this->target_ = target; }
protected:
+ // Returns NULL for Objects that are not plugin objects. This method
+ // is overridden in the Pluginobj class.
+ virtual Pluginobj*
+ do_pluginobj()
+ { return NULL; }
+
// Read the symbols--implemented by child class.
virtual void
do_read_symbols(Read_symbols_data*) = 0;
virtual Location
do_section_contents(unsigned int shndx) = 0;
+ // Get the size of a section--implemented by child class.
+ virtual uint64_t
+ do_section_size(unsigned int shndx) = 0;
+
// Get the name of a section--implemented by child class.
virtual std::string
do_section_name(unsigned int shndx) = 0;
virtual uint64_t
do_section_flags(unsigned int shndx) = 0;
+ // Get section address--implemented by child class.
+ virtual uint64_t
+ do_section_address(unsigned int shndx) = 0;
+
// Get section type--implemented by child class.
virtual unsigned int
do_section_type(unsigned int shndx) = 0;
virtual unsigned int
do_section_info(unsigned int shndx) = 0;
- // Get the file.
- Input_file*
- input_file() const
- { return this->input_file_; }
+ // Get section alignment--implemented by child class.
+ virtual uint64_t
+ do_section_addralign(unsigned int shndx) = 0;
- // Get a view into the underlying file.
- const unsigned char*
- get_view(off_t start, off_t size, bool cache)
- {
- return this->input_file_->file().get_view(start + this->offset_, size,
- cache);
- }
+ // Return the Xindex structure to use.
+ virtual Xindex*
+ do_initialize_xindex() = 0;
- // Get a lasting view into the underlying file.
- File_view*
- get_lasting_view(off_t start, off_t size, bool cache)
- {
- return this->input_file_->file().get_lasting_view(start + this->offset_,
- size, cache);
- }
+ // Implement get_global_symbol_counts--implemented by child class.
+ virtual void
+ do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
- // Read data from the underlying file.
- void
- read(off_t start, off_t size, void* p)
- { this->input_file_->file().read(start + this->offset_, size, p); }
+ // Get the file. We pass on const-ness.
+ Input_file*
+ input_file()
+ { return this->input_file_; }
+
+ const Input_file*
+ input_file() const
+ { return this->input_file_; }
// Set the target.
void
read_section_data(elfcpp::Elf_file<size, big_endian, Object>*,
Read_symbols_data*);
+ // Let the child class initialize the xindex object directly.
+ void
+ set_xindex(Xindex* xindex)
+ {
+ gold_assert(this->xindex_ == NULL);
+ this->xindex_ = xindex;
+ }
+
// If NAME is the name of a special .gnu.warning section, arrange
// for the warning to be issued. SHNDX is the section index.
// Return whether it is a warning section.
bool is_dynamic_;
// Target functions--may be NULL if the target is not known.
Target* target_;
+ // Many sections for objects with more than SHN_LORESERVE sections.
+ Xindex* xindex_;
};
// Implement sized_target inline for efficiency. This approach breaks
template<int size, bool big_endian>
inline Sized_target<size, big_endian>*
-Object::sized_target(ACCEPT_SIZE_ENDIAN_ONLY)
+Object::sized_target() const
{
gold_assert(this->target_->get_size() == size);
gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian);
public:
Relobj(const std::string& name, Input_file* input_file, off_t offset = 0)
: Object(name, input_file, false, offset),
- map_to_output_(),
+ output_sections_(),
+ map_to_relocatable_relocs_(NULL),
object_merge_map_(NULL),
relocs_must_follow_section_writes_(false)
{ }
Layout* layout, Read_relocs_data* rd)
{ return this->do_scan_relocs(options, symtab, layout, rd); }
- // Initial local symbol processing: set the offset where local
- // symbol information will be stored; add local symbol names to
- // *POOL; return the new local symbol index.
+ // The number of local symbols in the input symbol table.
+ virtual unsigned int
+ local_symbol_count() const
+ { return this->do_local_symbol_count(); }
+
+ // 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.
+ void
+ count_local_symbols(Stringpool_template<char>* pool,
+ Stringpool_template<char>* dynpool)
+ { return this->do_count_local_symbols(pool, dynpool); }
+
+ // Set the values of the local symbols, set the output symbol table
+ // indexes for the local variables, and set the offset where local
+ // symbol information will be stored. Returns the new local symbol index.
+ unsigned int
+ finalize_local_symbols(unsigned int index, off_t off)
+ { return this->do_finalize_local_symbols(index, off); }
+
+ // Set the output dynamic symbol table indexes for the local variables.
unsigned int
- finalize_local_symbols(unsigned int index, off_t off,
- Stringpool_template<char>* pool)
- { return this->do_finalize_local_symbols(index, off, pool); }
+ set_local_dynsym_indexes(unsigned int index)
+ { return this->do_set_local_dynsym_indexes(index); }
+
+ // Set the offset where local dynamic symbol information will be stored.
+ unsigned int
+ set_local_dynsym_offset(off_t off)
+ { return this->do_set_local_dynsym_offset(off); }
// Relocate the input sections and write out the local symbols.
void
bool
is_section_included(unsigned int shndx) const
{
- gold_assert(shndx < this->map_to_output_.size());
- return this->map_to_output_[shndx].output_section != NULL;
+ gold_assert(shndx < this->output_sections_.size());
+ return this->output_sections_[shndx] != NULL;
}
- // Return whether an input section requires special
- // handling--whether it is not simply mapped from the input file to
- // the output file.
- bool
- is_section_specially_mapped(unsigned int shndx) const
+ // Given a section index, return the corresponding Output_section.
+ // The return value will be NULL if the section is not included in
+ // the link.
+ Output_section*
+ output_section(unsigned int shndx) const
{
- gold_assert(shndx < this->map_to_output_.size());
- return (this->map_to_output_[shndx].output_section != NULL
- && this->map_to_output_[shndx].offset == -1);
+ gold_assert(shndx < this->output_sections_.size());
+ return this->output_sections_[shndx];
}
- // Given a section index, return the corresponding Output_section
- // (which will be NULL if the section is not included in the link)
- // and set *POFF to the offset within that section. *POFF will be
- // set to -1 if the section requires special handling.
- inline Output_section*
- output_section(unsigned int shndx, off_t* poff) const;
+ // 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.
+ uint64_t
+ output_section_offset(unsigned int shndx) const
+ { return this->do_output_section_offset(shndx); }
// Set the offset of an input section within its output section.
void
- set_section_offset(unsigned int shndx, off_t off)
- {
- gold_assert(shndx < this->map_to_output_.size());
- this->map_to_output_[shndx].offset = off;
- }
+ set_section_offset(unsigned int shndx, uint64_t off)
+ { this->do_set_section_offset(shndx, off); }
// Return true if we need to wait for output sections to be written
// before we can apply relocations. This is true if the object has
// any relocations for sections which require special handling, such
// as the exception frame section.
bool
- relocs_must_follow_section_writes()
+ relocs_must_follow_section_writes() const
{ return this->relocs_must_follow_section_writes_; }
// Return the object merge map.
this->object_merge_map_ = object_merge_map;
}
- protected:
- // What we need to know to map an input section to an output
- // section. We keep an array of these, one for each input section,
- // indexed by the input section number.
- struct Map_to_output
+ // Record the relocatable reloc info for an input reloc section.
+ void
+ set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr)
{
- // The output section. This is NULL if the input section is to be
- // discarded.
- Output_section* output_section;
- // The offset within the output section. This is -1 if the
- // section requires special handling.
- off_t offset;
- };
+ gold_assert(reloc_shndx < this->shnum());
+ (*this->map_to_relocatable_relocs_)[reloc_shndx] = rr;
+ }
+
+ // Get the relocatable reloc info for an input reloc section.
+ Relocatable_relocs*
+ relocatable_relocs(unsigned int reloc_shndx)
+ {
+ gold_assert(reloc_shndx < this->shnum());
+ return (*this->map_to_relocatable_relocs_)[reloc_shndx];
+ }
+
+ // Layout sections whose layout was deferred while waiting for
+ // input files from a plugin.
+ void
+ layout_deferred_sections(Layout* layout)
+ { this->do_layout_deferred_sections(layout); }
+
+ 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.
+ typedef std::vector<Output_section*> Output_sections;
// Read the relocs--implemented by child class.
virtual void
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
Read_relocs_data*) = 0;
- // Finalize local symbols--implemented by child class.
+ // Return the number of local symbols--implemented by child class.
+ virtual unsigned int
+ do_local_symbol_count() const = 0;
+
+ // Count local symbols--implemented by child class.
+ virtual void
+ do_count_local_symbols(Stringpool_template<char>*,
+ Stringpool_template<char>*) = 0;
+
+ // Finalize the local symbols. Set the output symbol table indexes
+ // for the local variables, and set the offset where local symbol
+ // information will be stored.
+ virtual unsigned int
+ do_finalize_local_symbols(unsigned int, off_t) = 0;
+
+ // Set the output dynamic symbol table indexes for the local variables.
+ virtual unsigned int
+ do_set_local_dynsym_indexes(unsigned int) = 0;
+
+ // Set the offset where local dynamic symbol information will be stored.
virtual unsigned int
- do_finalize_local_symbols(unsigned int, off_t,
- Stringpool_template<char>*) = 0;
+ do_set_local_dynsym_offset(off_t) = 0;
// Relocate the input sections and write out the local
// symbols--implemented by child class.
do_relocate(const General_options& options, const Symbol_table* symtab,
const Layout*, Output_file* of) = 0;
+ // Get the offset of a section--implemented by child class.
+ virtual uint64_t
+ do_output_section_offset(unsigned int shndx) const = 0;
+
+ // Set the offset of a section--implemented by child class.
+ virtual void
+ do_set_section_offset(unsigned int shndx, uint64_t off) = 0;
+
+ // Layout sections whose layout was deferred while waiting for
+ // input files from a plugin--implemented by child class.
+ virtual void
+ do_layout_deferred_sections(Layout*) = 0;
+
// Return the vector mapping input sections to output sections.
- std::vector<Map_to_output>&
- map_to_output()
- { return this->map_to_output_; }
+ Output_sections&
+ output_sections()
+ { return this->output_sections_; }
- const std::vector<Map_to_output>&
- map_to_output() const
- { return this->map_to_output_; }
+ const Output_sections&
+ output_sections() const
+ { return this->output_sections_; }
+
+ // Set the size of the relocatable relocs array.
+ void
+ size_relocatable_relocs()
+ {
+ this->map_to_relocatable_relocs_ =
+ new std::vector<Relocatable_relocs*>(this->shnum());
+ }
// Record that we must wait for the output sections to be written
// before applying relocations.
private:
// Mapping from input sections to output section.
- std::vector<Map_to_output> map_to_output_;
+ Output_sections output_sections_;
+ // Mapping from input section index to the information recorded for
+ // the relocations. This is only used for a relocatable link.
+ std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_;
// Mappings for merge sections. This is managed by the code in the
// Merge_map class.
Object_merge_map* object_merge_map_;
bool relocs_must_follow_section_writes_;
};
-// Implement Object::output_section inline for efficiency.
-inline Output_section*
-Relobj::output_section(unsigned int shndx, off_t* poff) const
+// This class is used to handle relocations against a section symbol
+// in an SHF_MERGE section. For such a symbol, we need to know the
+// addend of the relocation before we can determine the final value.
+// The addend gives us the location in the input section, and we can
+// determine how it is mapped to the output section. For a
+// non-section symbol, we apply the addend to the final value of the
+// symbol; that is done in finalize_local_symbols, and does not use
+// this class.
+
+template<int size>
+class Merged_symbol_value
{
- gold_assert(shndx < this->map_to_output_.size());
- const Map_to_output& mo(this->map_to_output_[shndx]);
- *poff = mo.offset;
- return mo.output_section;
-}
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
+
+ // We use a hash table to map offsets in the input section to output
+ // addresses.
+ typedef Unordered_map<section_offset_type, Value> Output_addresses;
+
+ Merged_symbol_value(Value input_value, Value output_start_address)
+ : input_value_(input_value), output_start_address_(output_start_address),
+ output_addresses_()
+ { }
+
+ // Initialize the hash table.
+ void
+ initialize_input_to_output_map(const Relobj*, unsigned int input_shndx);
+
+ // Release the hash table to save space.
+ void
+ free_input_to_output_map()
+ { this->output_addresses_.clear(); }
+
+ // Get the output value corresponding to an addend. The object and
+ // input section index are passed in because the caller will have
+ // them; otherwise we could store them here.
+ Value
+ value(const Relobj* object, unsigned int input_shndx, Value addend) const
+ {
+ // This is a relocation against a section symbol. ADDEND is the
+ // offset in the section. The result should be the start of some
+ // merge area. If the object file wants something else, it should
+ // use a regular symbol rather than a section symbol.
+ // Unfortunately, PR 6658 shows a case in which the object file
+ // refers to the section symbol, but uses a negative ADDEND to
+ // compensate for a PC relative reloc. We can't handle the
+ // general case. However, we can handle the special case of a
+ // negative addend, by assuming that it refers to the start of the
+ // section. Of course, that means that we have to guess when
+ // ADDEND is negative. It is normal to see a 32-bit value here
+ // even when the template parameter size is 64, as 64-bit object
+ // file formats have 32-bit relocations. We know this is a merge
+ // section, so we know it has to fit into memory. So we assume
+ // that we won't see a value larger than a large 32-bit unsigned
+ // value. This will break objects with very very large merge
+ // sections; they probably break in other ways anyhow.
+ Value input_offset = this->input_value_;
+ if (addend < 0xffffff00)
+ {
+ input_offset += addend;
+ addend = 0;
+ }
+ typename Output_addresses::const_iterator p =
+ this->output_addresses_.find(input_offset);
+ if (p != this->output_addresses_.end())
+ return p->second + addend;
+
+ return (this->value_from_output_section(object, input_shndx, input_offset)
+ + addend);
+ }
+
+ private:
+ // Get the output value for an input offset if we couldn't find it
+ // in the hash table.
+ Value
+ value_from_output_section(const Relobj*, unsigned int input_shndx,
+ Value input_offset) const;
+
+ // The value of the section symbol in the input file. This is
+ // normally zero, but could in principle be something else.
+ Value input_value_;
+ // The start address of this merged section in the output file.
+ Value output_start_address_;
+ // A hash table which maps offsets in the input section to output
+ // addresses. This only maps specific offsets, not all offsets.
+ Output_addresses output_addresses_;
+};
// This POD class is holds the value of a symbol. This is used for
// local symbols, and for all symbols during relocation processing.
typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
Symbol_value()
- : output_symtab_index_(0), input_shndx_(0), is_section_symbol_(false),
- needs_output_address_(false), value_(0)
- { }
+ : output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0),
+ is_ordinary_shndx_(false), is_section_symbol_(false),
+ is_tls_symbol_(false), has_output_value_(true)
+ { this->u_.value = 0; }
// 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.
Value
value(const Sized_relobj<size, big_endian>* object, Value addend) const
{
- if (!this->needs_output_address_)
- return this->value_ + addend;
- return object->local_value(this->input_shndx_, this->value_,
- this->is_section_symbol_, addend);
+ if (this->has_output_value_)
+ return this->u_.value + addend;
+ else
+ {
+ gold_assert(this->is_ordinary_shndx_);
+ return this->u_.merged_symbol_value->value(object, this->input_shndx_,
+ addend);
+ }
}
// Set the value of this symbol in the output symbol table.
void
set_output_value(Value value)
+ { this->u_.value = value; }
+
+ // For a section symbol in a merged section, we need more
+ // information.
+ void
+ set_merged_symbol_value(Merged_symbol_value<size>* msv)
{
- this->value_ = value;
- this->needs_output_address_ = false;
+ gold_assert(this->is_section_symbol_);
+ this->has_output_value_ = false;
+ this->u_.merged_symbol_value = msv;
}
- // If this symbol is mapped to an output section which requires
- // special handling to determine the output value, we store the
- // value of the symbol in the input file. This is used for
- // SHF_MERGE sections.
+ // Initialize the input to output map for a section symbol in a
+ // merged section. We also initialize the value of a non-section
+ // symbol in a merged section.
void
- set_input_value(Value value)
+ initialize_input_to_output_map(const Relobj* object)
+ {
+ if (!this->has_output_value_)
+ {
+ gold_assert(this->is_section_symbol_ && this->is_ordinary_shndx_);
+ Merged_symbol_value<size>* msv = this->u_.merged_symbol_value;
+ msv->initialize_input_to_output_map(object, this->input_shndx_);
+ }
+ }
+
+ // Free the input to output map for a section symbol in a merged
+ // section.
+ void
+ free_input_to_output_map()
{
- this->value_ = value;
- this->needs_output_address_ = true;
+ if (!this->has_output_value_)
+ this->u_.merged_symbol_value->free_input_to_output_map();
}
+ // Set the value of the symbol from the input file. This is only
+ // called by count_local_symbols, to communicate the value to
+ // finalize_local_symbols.
+ void
+ set_input_value(Value value)
+ { this->u_.value = value; }
+
+ // Return the input value. This is only called by
+ // finalize_local_symbols and (in special cases) relocate_section.
+ Value
+ input_value() const
+ { return this->u_.value; }
+
// Return whether this symbol should go into the output symbol
// table.
bool
needs_output_symtab_entry() const
- {
- gold_assert(this->output_symtab_index_ != 0);
- return this->output_symtab_index_ != -1U;
- }
+ { return this->output_symtab_index_ != -1U; }
// Return the index in the output symbol table.
unsigned int
this->output_symtab_index_ = -1U;
}
+ // Set the index in the output dynamic symbol table.
+ void
+ set_needs_output_dynsym_entry()
+ {
+ gold_assert(!this->is_section_symbol());
+ this->output_dynsym_index_ = 0;
+ }
+
+ // Return whether this symbol should go into the output symbol
+ // table.
+ bool
+ needs_output_dynsym_entry() const
+ {
+ return this->output_dynsym_index_ != -1U;
+ }
+
+ // Record that this symbol should go into the dynamic symbol table.
+ void
+ set_output_dynsym_index(unsigned int i)
+ {
+ gold_assert(this->output_dynsym_index_ == 0);
+ this->output_dynsym_index_ = i;
+ }
+
+ // Return the index in the output dynamic symbol table.
+ unsigned int
+ output_dynsym_index() const
+ {
+ gold_assert(this->output_dynsym_index_ != 0
+ && this->output_dynsym_index_ != -1U);
+ return this->output_dynsym_index_;
+ }
+
// Set the index of the input section in the input file.
void
- set_input_shndx(unsigned int i)
+ set_input_shndx(unsigned int i, bool is_ordinary)
{
this->input_shndx_ = i;
+ // input_shndx_ field is a bitfield, so make sure that the value
+ // fits.
gold_assert(this->input_shndx_ == i);
+ this->is_ordinary_shndx_ = is_ordinary;
}
+ // Return the index of the input section in the input file.
+ unsigned int
+ input_shndx(bool* is_ordinary) const
+ {
+ *is_ordinary = this->is_ordinary_shndx_;
+ return this->input_shndx_;
+ }
+
+ // Whether this is a section symbol.
+ bool
+ is_section_symbol() const
+ { return this->is_section_symbol_; }
+
// Record that this is a section symbol.
void
set_is_section_symbol()
- { this->is_section_symbol_ = true; }
+ {
+ gold_assert(!this->needs_output_dynsym_entry());
+ this->is_section_symbol_ = true;
+ }
+
+ // Record that this is a TLS symbol.
+ void
+ set_is_tls_symbol()
+ { this->is_tls_symbol_ = true; }
+
+ // Return TRUE if this is a TLS symbol.
+ bool
+ is_tls_symbol() const
+ { return this->is_tls_symbol_; }
private:
// The index of this local symbol in the output symbol table. This
// will be -1 if the symbol should not go into the symbol table.
unsigned int output_symtab_index_;
+ // The index of this local symbol in the dynamic symbol table. This
+ // will be -1 if the symbol should not go into the symbol table.
+ unsigned int output_dynsym_index_;
// The section index in the input file in which this symbol is
// defined.
- unsigned int input_shndx_ : 30;
+ unsigned int input_shndx_ : 28;
+ // Whether the section index is an ordinary index, not a special
+ // value.
+ bool is_ordinary_shndx_ : 1;
// Whether this is a STT_SECTION symbol.
bool is_section_symbol_ : 1;
- // Whether getting the value of this symbol requires calling an
- // Output_section method. For example, this will be true of a
- // symbol in a SHF_MERGE section.
- bool needs_output_address_ : 1;
- // The value of the symbol. If !needs_output_address_, this is the
- // value in the output file. If needs_output_address_, this is the
- // value in the input file.
- Value value_;
+ // Whether this is a STT_TLS symbol.
+ bool is_tls_symbol_ : 1;
+ // Whether this symbol has a value for the output file. This is
+ // normally set to true during Layout::finalize, by
+ // finalize_local_symbols. It will be false for a section symbol in
+ // a merge section, as for such symbols we can not determine the
+ // value to use in a relocation until we see the addend.
+ bool has_output_value_ : 1;
+ union
+ {
+ // This is used if has_output_value_ is true. Between
+ // count_local_symbols and finalize_local_symbols, this is the
+ // value in the input file. After finalize_local_symbols, it is
+ // the value in the output file.
+ Value value;
+ // This is used if has_output_value_ is false. It points to the
+ // information we need to get the value for a merge section.
+ Merged_symbol_value<size>* merged_symbol_value;
+ } 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.
+
+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;
+ }
+
+ private:
+ unsigned int got_type_;
+ unsigned int got_offset_;
+ Got_offset_list* got_next_;
};
// A regular object file. This is size and endian specific.
typedef std::vector<Symbol*> 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>&);
void
setup(const typename elfcpp::Ehdr<size, big_endian>&);
- // Return the number of local symbols.
+ // Return the number of symbols. This is only valid after
+ // Object::add_symbols has been called.
unsigned int
- local_symbol_count() const
- { return this->local_symbol_count_; }
+ symbol_count() const
+ { return this->local_symbol_count_ + this->symbols_.size(); }
// If SYM is the index of a global symbol in the object file's
// symbol table, return the Symbol object. Otherwise, return NULL.
}
// Return the section index of symbol SYM. Set *VALUE to its value
- // in the object file. Note that for a symbol which is not defined
- // in this object file, this will set *VALUE to 0 and return
- // SHN_UNDEF; it will not return the final value of the symbol in
- // the link.
+ // in the object file. Set *IS_ORDINARY if this is an ordinary
+ // section index, not a special code between SHN_LORESERVE and
+ // SHN_HIRESERVE. Note that for a symbol which is not defined in
+ // this object file, this will set *VALUE to 0 and return SHN_UNDEF;
+ // it will not return the final value of the symbol in the link.
unsigned int
- symbol_section_and_value(unsigned int sym, Address* value);
+ symbol_section_and_value(unsigned int sym, Address* value, bool* is_ordinary);
// Return a pointer to the Symbol_value structure which holds the
// value of a local symbol.
return this->local_values_[sym].output_symtab_index();
}
+ // Return the index of local symbol SYM in the dynamic symbol
+ // table. A value of -1U means that the symbol is not being output.
+ unsigned int
+ dynsym_index(unsigned int sym) const
+ {
+ gold_assert(sym < this->local_values_.size());
+ return this->local_values_[sym].output_dynsym_index();
+ }
+
+ // Return the input section index of local symbol SYM.
+ unsigned int
+ local_symbol_input_shndx(unsigned int sym, bool* is_ordinary) const
+ {
+ gold_assert(sym < this->local_values_.size());
+ return this->local_values_[sym].input_shndx(is_ordinary);
+ }
+
// Return the appropriate Sized_target structure.
Sized_target<size, big_endian>*
sized_target()
+ { return this->Object::sized_target<size, big_endian>(); }
+
+ // Record that local symbol SYM needs a dynamic symbol entry.
+ void
+ set_needs_output_dynsym_entry(unsigned int sym)
{
- return this->Object::sized_target
- SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
- SELECT_SIZE_ENDIAN_ONLY(size, big_endian));
+ gold_assert(sym < this->local_values_.size());
+ this->local_values_[sym].set_needs_output_dynsym_entry();
}
- // Return the value of the local symbol symndx.
- Address
- local_symbol_value(unsigned int symndx) const;
-
- // Return the value of a local symbol defined in input section
- // SHNDX, with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
- // indicates whether the symbol is a section symbol. This handles
- // SHF_MERGE sections.
- Address
- local_value(unsigned int shndx, Address value, bool is_section_symbol,
- Address addend) const;
-
// 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) const
+ local_has_got_offset(unsigned int symndx, unsigned int got_type) const
{
- return (this->local_got_offsets_.find(symndx)
- != this->local_got_offsets_.end());
+ 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) const
+ 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());
- return p->second;
+ 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_offset)
- {
- std::pair<Local_got_offsets::iterator, bool> ins =
- this->local_got_offsets_.insert(std::make_pair(symndx, got_offset));
- gold_assert(ins.second);
- }
-
- // Return whether the local TLS symbol SYMNDX has a GOT offset.
- // The GOT entry at this offset will contain a module index. If
- // NEED_PAIR is true, a second entry immediately following the first
- // will contain the dtv-relative offset.
- bool
- local_has_tls_got_offset(unsigned int symndx, bool need_pair) const
- {
- typename Local_tls_got_offsets::const_iterator p =
- this->local_tls_got_offsets_.find(symndx);
- if (p == this->local_tls_got_offsets_.end()
- || (need_pair && !p->second.have_pair_))
- return false;
- return true;
- }
-
- // Return the offset of the GOT entry for the local TLS symbol SYMNDX.
- // If NEED_PAIR is true, we need the offset of a pair of GOT entries;
- // otherwise we need the offset of the GOT entry for the module index.
- unsigned int
- local_tls_got_offset(unsigned int symndx, bool need_pair) const
- {
- typename Local_tls_got_offsets::const_iterator p =
- this->local_tls_got_offsets_.find(symndx);
- gold_assert(p != this->local_tls_got_offsets_.end());
- gold_assert(!need_pair || p->second.have_pair_);
- return p->second.got_offset_;
- }
-
- // Set the offset of the GOT entry for the local TLS symbol SYMNDX
- // to GOT_OFFSET. If HAVE_PAIR is true, we have a pair of GOT entries;
- // otherwise, we have just a single entry for the module index.
- void
- set_local_tls_got_offset(unsigned int symndx, unsigned int got_offset,
- bool have_pair)
+ set_local_got_offset(unsigned int symndx, unsigned int got_type,
+ unsigned int got_offset)
{
- typename Local_tls_got_offsets::iterator p =
- this->local_tls_got_offsets_.find(symndx);
- if (p != this->local_tls_got_offsets_.end())
- {
- // An entry already existed for this symbol. This can happen
- // if we see a relocation asking for the module index before
- // a relocation asking for the pair. In that case, the original
- // GOT entry will remain, but won't get used by any further
- // relocations.
- p->second.got_offset_ = got_offset;
- gold_assert(have_pair);
- p->second.have_pair_ = true;
- }
+ 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
{
- std::pair<typename Local_tls_got_offsets::iterator, bool> ins =
- this->local_tls_got_offsets_.insert(
- std::make_pair(symndx, Tls_got_entry(got_offset, have_pair)));
+ 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);
}
}
+ // 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];
+ }
+
// 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.
get_symbol_location_info(unsigned int shndx, off_t offset,
Symbol_location_info* info);
+ // Look for a kept section corresponding to the given discarded section,
+ // 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;
+
+ protected:
// Read the symbols.
void
do_read_symbols(Read_symbols_data*);
+ // Return the number of local symbols.
+ unsigned int
+ do_local_symbol_count() const
+ { return this->local_symbol_count_; }
+
// Lay out the input sections.
void
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
+ // Layout sections whose layout was deferred while waiting for
+ // input files from a plugin.
+ void
+ do_layout_deferred_sections(Layout*);
+
// Add the symbols to the symbol table.
void
do_add_symbols(Symbol_table*, Read_symbols_data*);
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
Read_relocs_data*);
+ // Count the local symbols.
+ void
+ do_count_local_symbols(Stringpool_template<char>*,
+ Stringpool_template<char>*);
+
// Finalize the local symbols.
unsigned int
- do_finalize_local_symbols(unsigned int, off_t,
- Stringpool_template<char>*);
+ do_finalize_local_symbols(unsigned int, off_t);
+
+ // Set the offset where local dynamic symbol information will be stored.
+ unsigned int
+ do_set_local_dynsym_indexes(unsigned int);
+
+ // Set the offset where local dynamic symbol information will be stored.
+ unsigned int
+ do_set_local_dynsym_offset(off_t);
// Relocate the input sections and write out the local symbols.
void
do_relocate(const General_options& options, const Symbol_table* symtab,
const Layout*, Output_file* of);
+ // Get the size of a section.
+ uint64_t
+ do_section_size(unsigned int shndx)
+ { return this->elf_file_.section_size(shndx); }
+
// Get the name of a section.
std::string
do_section_name(unsigned int shndx)
do_section_flags(unsigned int shndx)
{ return this->elf_file_.section_flags(shndx); }
+ // Return section address.
+ uint64_t
+ do_section_address(unsigned int shndx)
+ { return this->elf_file_.section_addr(shndx); }
+
// Return section type.
unsigned int
do_section_type(unsigned int shndx)
do_section_info(unsigned int shndx)
{ return this->elf_file_.section_info(shndx); }
+ // Return the section alignment.
+ uint64_t
+ do_section_addralign(unsigned int shndx)
+ { return this->elf_file_.section_addralign(shndx); }
+
+ // Return the Xindex structure to use.
+ Xindex*
+ do_initialize_xindex();
+
+ // Get symbol counts.
+ void
+ do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
+
+ // 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] = convert_types<Address, uint64_t>(off);
+ }
+
private:
// For convenience.
typedef Sized_relobj<size, big_endian> This;
static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
typedef elfcpp::Shdr<size, big_endian> Shdr;
+ // 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(Sized_relobj<size, big_endian>* object,
+ unsigned int shndx)
+ : object_(object), shndx_(shndx)
+ { }
+ Sized_relobj<size, big_endian>* object_;
+ unsigned int shndx_;
+ };
+ typedef std::map<unsigned int, Kept_comdat_section*>
+ Kept_comdat_section_table;
+
+ // Information needed to keep track of kept comdat groups. This is
+ // simply a map from the section name to its section index. This may
+ // not be a one-to-one mapping, but we ignore that possibility since
+ // this is used only to attempt to handle stray relocations from
+ // non-comdat debug sections that refer to comdat loadable sections.
+ typedef Unordered_map<std::string, unsigned int> Comdat_group;
+
+ // A map from group section index to the table of group members.
+ typedef std::map<unsigned int, Comdat_group*> Comdat_group_table;
+
+ // Find a comdat group table given its group section SHNDX.
+ Comdat_group*
+ find_comdat_group(unsigned int shndx) const
+ {
+ Comdat_group_table::const_iterator p =
+ this->comdat_groups_.find(shndx);
+ if (p != this->comdat_groups_.end())
+ return p->second;
+ return NULL;
+ }
+
+ // Record a new comdat group whose group section index is SHNDX.
+ void
+ add_comdat_group(unsigned int shndx, Comdat_group* group)
+ { this->comdat_groups_[shndx] = group; }
+
+ // Adjust a section index if necessary.
+ unsigned int
+ adjust_shndx(unsigned int shndx)
+ {
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ shndx += this->elf_file_.large_shndx_offset();
+ return shndx;
+ }
+
// Find the SHT_SYMTAB section, given the section headers.
void
find_symtab(const unsigned char* pshdrs);
// a GNU style exception frame section.
bool
find_eh_frame(const unsigned char* pshdrs, const char* names,
- off_t names_size) const;
+ section_size_type names_size) const;
// Whether to include a section group in the link.
bool
- include_section_group(Layout*, unsigned int,
- const elfcpp::Shdr<size, big_endian>&,
+ include_section_group(Symbol_table*, Layout*, unsigned int, const char*,
+ const unsigned char*, const char *, section_size_type,
std::vector<bool>*);
// Whether to include a linkonce section in the link.
bool
- include_linkonce_section(Layout*, const char*,
+ include_linkonce_section(Layout*, unsigned int, const char*,
const elfcpp::Shdr<size, big_endian>&);
+ // 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);
+
// Views and sizes when relocating.
struct View_size
{
unsigned char* view;
typename elfcpp::Elf_types<size>::Elf_Addr address;
off_t offset;
- off_t view_size;
+ section_size_type view_size;
bool is_input_output_view;
bool is_postprocessing_view;
};
relocate_sections(const General_options& options, const Symbol_table*,
const Layout*, const unsigned char* pshdrs, Views*);
+ // Scan the input relocations for --emit-relocs.
+ void
+ emit_relocs_scan(const General_options&, Symbol_table*, Layout*,
+ const unsigned char* plocal_syms,
+ const Read_relocs_data::Relocs_list::iterator&);
+
+ // Scan the input relocations for --emit-relocs, templatized on the
+ // type of the relocation section.
+ template<int sh_type>
+ void
+ emit_relocs_scan_reltype(const General_options&, 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);
+
+ // Initialize input to output maps for section symbols in merged
+ // sections.
+ void
+ initialize_input_to_output_maps();
+
+ // Free the input to output maps for section symbols in merged
+ // sections.
+ void
+ free_input_to_output_maps();
+
// Write out the local symbols.
void
write_local_symbols(Output_file*,
- const Stringpool_template<char>*);
+ 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();
+ }
+
+ // Record a mapping from discarded section SHNDX to the corresponding
+ // kept section.
+ void
+ set_kept_comdat_section(unsigned int shndx, Kept_comdat_section* kept)
+ {
+ this->kept_comdat_sections_[shndx] = kept;
+ }
+
+ // Find the kept section corresponding to the discarded section SHNDX.
+ Kept_comdat_section*
+ get_kept_comdat_section(unsigned int shndx) const
+ {
+ typename Kept_comdat_section_table::const_iterator p =
+ this->kept_comdat_sections_.find(shndx);
+ if (p == this->kept_comdat_sections_.end())
+ return NULL;
+ return p->second;
+ }
// The GOT offsets of local symbols. This map also stores GOT offsets
// for tp-relative offsets for TLS symbols.
- typedef Unordered_map<unsigned int, unsigned int> Local_got_offsets;
+ typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets;
// The TLS GOT offsets of local symbols. The map stores the offsets
// for either a single GOT entry that holds the module index of a TLS
};
typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets;
+ // Saved information for sections whose layout was deferred.
+ struct Deferred_layout
+ {
+ static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
+ Deferred_layout(unsigned int shndx, const char* name,
+ const unsigned char* pshdr,
+ unsigned int reloc_shndx, unsigned int reloc_type)
+ : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx),
+ reloc_type_(reloc_type)
+ {
+ memcpy(this->shdr_data_, pshdr, shdr_size);
+ }
+ unsigned int shndx_;
+ std::string name_;
+ 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_;
// Index of SHT_SYMTAB section.
unsigned int local_symbol_count_;
// The number of local symbols which go into the output file.
unsigned int output_local_symbol_count_;
+ // The number of local symbols which go into the output file's dynamic
+ // symbol table.
+ unsigned int output_local_dynsym_count_;
// The entries in the symbol table for the external symbols.
Symbols symbols_;
+ // Number of symbols defined in object file itself.
+ size_t defined_count_;
// File offset for local symbols.
off_t local_symbol_offset_;
+ // File offset for local dynamic symbols.
+ 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_;
- // GOT offsets for local TLS symbols, indexed by symbol number
- // and GOT entry type.
- Local_tls_got_offsets local_tls_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_;
+ // Table mapping discarded comdat sections to corresponding kept sections.
+ Kept_comdat_section_table kept_comdat_sections_;
+ // Table of kept comdat groups.
+ Comdat_group_table comdat_groups_;
// Whether this object has a GNU style .eh_frame section.
bool has_eh_frame_;
+ // The list of sections whose layout was deferred.
+ std::vector<Deferred_layout> deferred_layout_;
};
// A class to manage the list of all objects.
{
public:
Input_objects()
- : relobj_list_(), dynobj_list_(), target_(NULL), sonames_(),
- system_library_directory_()
+ : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(),
+ cref_(NULL)
{ }
// The type of the list of input relocateable objects.
bool
add_object(Object*);
- // Get the target we should use for the output file.
- Target*
- target() const
- { return this->target_; }
+ // Start processing an archive.
+ void
+ archive_start(Archive*);
+
+ // Stop processing an archive.
+ void
+ archive_stop(Archive*);
// For each dynamic object, check whether we've seen all of its
// explicit dependencies.
bool
found_in_system_library_directory(const Object*) const;
+ // Print symbol counts.
+ void
+ print_symbol_counts(const Symbol_table*) const;
+
// Iterate over all regular objects.
Relobj_iterator
Relobj_list relobj_list_;
// The list of dynamic objects included in the link.
Dynobj_list dynobj_list_;
- // The target.
- Target* target_;
// SONAMEs that we have seen.
Unordered_set<std::string> sonames_;
// The directory in which we find the libc.so.
std::string system_library_directory_;
+ // Manage cross-references if requested.
+ Cref* cref_;
};
// Some of the information we pass to the relocation routines. We
extern Object*
make_elf_object(const std::string& name, Input_file*,
off_t offset, const unsigned char* p,
- off_t bytes);
+ section_offset_type bytes);
} // end namespace gold