// object.h -- support for an object file for linking in gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "elfcpp_file.h"
#include "fileread.h"
#include "target.h"
+#include "archive.h"
namespace gold
{
class General_options;
class Task;
class Cref;
-class Archive;
class Layout;
+class Output_data;
class Output_section;
class Output_file;
class Output_symtab_xindex;
struct Read_symbols_data
{
+ Read_symbols_data()
+ : section_headers(NULL), section_names(NULL), symbols(NULL),
+ symbol_names(NULL), versym(NULL), verdef(NULL), verneed(NULL)
+ { }
+
+ ~Read_symbols_data();
+
// Section headers.
File_view* section_headers;
// Section names.
struct Section_relocs
{
+ Section_relocs()
+ : contents(NULL)
+ { }
+
+ ~Section_relocs()
+ { delete this->contents; }
+
// Index of reloc section.
unsigned int reloc_shndx;
// Index of section that relocs apply to.
struct Read_relocs_data
{
+ Read_relocs_data()
+ : local_symbols(NULL)
+ { }
+
+ ~Read_relocs_data()
+ { delete this->local_symbols; }
+
typedef std::vector<Section_relocs> Relocs_list;
// The relocations.
Relocs_list relocs;
class Object
{
public:
+ typedef std::vector<Symbol*> Symbols;
+
// NAME is the name of the object as we would report it to the user
// (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is
// used to read the file. OFFSET is the offset within the input
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), xindex_(NULL)
+ 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(); }
virtual ~Object()
is_dynamic() const
{ return this->is_dynamic_; }
+ // 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
+ // setting it.
+ bool
+ is_needed() const
+ { return this->is_needed_; }
+
+ // Record that this object is needed.
+ void
+ set_is_needed()
+ { this->is_needed_ = true; }
+
+ // Return whether this object was compiled with -fsplit-stack.
+ bool
+ uses_split_stack() const
+ { return this->uses_split_stack_; }
+
+ // Return whether this object contains any functions compiled with
+ // the no_split_stack attribute.
+ bool
+ has_no_split_stack() const
+ { return this->has_no_split_stack_; }
+
// 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
- { return this->target_; }
+ // Get the file. We pass on const-ness.
+ Input_file*
+ input_file()
+ { return this->input_file_; }
+
+ const Input_file*
+ input_file() const
+ { return this->input_file_; }
// Lock the underlying file.
void
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() const;
-
// Get the number of sections.
unsigned int
shnum() const
section_flags(unsigned int shndx)
{ return this->do_section_flags(shndx); }
+ // Return the section entsize given a section index.
+ uint64_t
+ section_entsize(unsigned int shndx)
+ { return this->do_section_entsize(shndx); }
+
// Return the section address given a section index.
uint64_t
section_address(unsigned int shndx)
section_addralign(unsigned int shndx)
{ return this->do_section_addralign(shndx); }
+ // Return the output section given a section index.
+ Output_section*
+ output_section(unsigned int shndx) const
+ { return this->do_output_section(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.
+ uint64_t
+ output_section_offset(unsigned int shndx) const
+ { return this->do_output_section_offset(shndx); }
+
// Read the symbol information.
void
read_symbols(Read_symbols_data* sd)
// Add symbol information to the global symbol table.
void
- add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
- { this->do_add_symbols(symtab, sd); }
+ add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout)
+ { this->do_add_symbols(symtab, sd, layout); }
+
+ // Add symbol information to the global symbol table.
+ Archive::Should_include
+ should_include_member(Symbol_table* symtab, Layout* layout,
+ Read_symbols_data* sd, std::string* why)
+ { return this->do_should_include_member(symtab, layout, sd, why); }
// Functions and types for the elfcpp::Elf_file interface. This
// permit us to use Object as the File template parameter for
size_t* used) const
{ this->do_get_global_symbol_counts(symtab, defined, used); }
- // Set the target.
+ // Get the symbols defined in this object.
+ const Symbols*
+ get_global_symbols() const
+ { return this->do_get_global_symbols(); }
+
+ // Return whether this object was found in a system directory.
+ bool
+ is_in_system_directory() const
+ { return this->input_file()->is_in_system_directory(); }
+
+ // Return whether we found this object by searching a directory.
+ bool
+ searched_for() const
+ { return this->input_file()->will_search_for(); }
+
+ bool
+ no_export() const
+ { return this->no_export_; }
+
void
- set_target(Target* target)
- { this->target_ = target; }
+ 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); }
+
+ // Return the index of the first incremental relocation for symbol SYMNDX.
+ unsigned int
+ get_incremental_reloc_base(unsigned int symndx) const
+ { return this->do_get_incremental_reloc_base(symndx); }
+
+ // Return the number of incremental relocations for symbol SYMNDX.
+ unsigned int
+ get_incremental_reloc_count(unsigned int symndx) const
+ { return this->do_get_incremental_reloc_count(symndx); }
protected:
// Returns NULL for Objects that are not plugin objects. This method
// Add symbol information to the global symbol table--implemented by
// child class.
virtual void
- do_add_symbols(Symbol_table*, Read_symbols_data*) = 0;
+ do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0;
+
+ virtual Archive::Should_include
+ do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
+ std::string* why) = 0;
// Return the location of the contents of a section. Implemented by
// child class.
virtual uint64_t
do_section_flags(unsigned int shndx) = 0;
+ // Get section entsize--implemented by child class.
+ virtual uint64_t
+ do_section_entsize(unsigned int shndx) = 0;
+
// Get section address--implemented by child class.
virtual uint64_t
do_section_address(unsigned int shndx) = 0;
virtual uint64_t
do_section_addralign(unsigned int shndx) = 0;
+ // Return the output section given a section index--implemented
+ // by child class.
+ virtual Output_section*
+ do_output_section(unsigned int) const
+ { gold_unreachable(); }
+
+ // Get the offset of a section--implemented by child class.
+ virtual uint64_t
+ do_output_section_offset(unsigned int) const
+ { gold_unreachable(); }
+
// Return the Xindex structure to use.
virtual Xindex*
do_initialize_xindex() = 0;
virtual void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
- // Get the file. We pass on const-ness.
- Input_file*
- input_file()
- { return this->input_file_; }
-
- const Input_file*
- input_file() const
- { return this->input_file_; }
-
- // Set the target.
- void
- set_target(int machine, int size, bool big_endian, int osabi,
- int abiversion);
+ virtual const Symbols*
+ do_get_global_symbols() const = 0;
// Set the number of sections.
void
handle_gnu_warning_section(const char* name, unsigned int shndx,
Symbol_table*);
+ // If NAME is the name of the special section which indicates that
+ // this object was compiled with -fstack-split, 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; }
+
+ // Return the index of the first incremental relocation for symbol SYMNDX--
+ // implemented by child class.
+ virtual unsigned int
+ do_get_incremental_reloc_base(unsigned int) const
+ { gold_unreachable(); }
+
+ // Return the number of incremental relocations for symbol SYMNDX--
+ // implemented by child class.
+ virtual unsigned int
+ do_get_incremental_reloc_count(unsigned int) const
+ { gold_unreachable(); }
+
private:
// This class may not be copied.
Object(const Object&);
// Number of input sections.
unsigned int shnum_;
// Whether this is a dynamic object.
- bool is_dynamic_;
- // Target functions--may be NULL if the target is not known.
- Target* target_;
+ bool is_dynamic_ : 1;
+ // Whether this object is needed. This is only set for dynamic
+ // objects, and means that the object defined a symbol which was
+ // used by a reference from a regular object.
+ bool is_needed_ : 1;
+ // Whether this object was compiled with -fsplit-stack.
+ bool uses_split_stack_ : 1;
+ // Whether this object contains any functions compiled with the
+ // no_split_stack attribute.
+ bool has_no_split_stack_ : 1;
+ // True if exclude this object from automatic symbol export.
+ // This is used only for archive objects.
+ bool no_export_ : 1;
// Many sections for objects with more than SHN_LORESERVE sections.
Xindex* xindex_;
};
-// Implement sized_target inline for efficiency. This approach breaks
-// static type checking, but is made safe using asserts.
-
-template<int size, bool big_endian>
-inline Sized_target<size, big_endian>*
-Object::sized_target() const
-{
- gold_assert(this->target_->get_size() == size);
- gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian);
- return static_cast<Sized_target<size, big_endian>*>(this->target_);
-}
-
// A regular object (ET_REL). This is an abstract base class itself.
// The implementation is the template class Sized_relobj.
output_sections_(),
map_to_relocatable_relocs_(NULL),
object_merge_map_(NULL),
- relocs_must_follow_section_writes_(false)
+ relocs_must_follow_section_writes_(false),
+ sd_(NULL),
+ reloc_counts_(NULL),
+ reloc_bases_(NULL)
{ }
// During garbage collection, the Read_symbols_data pass for
// Process the relocs, during garbage collection only.
void
- gc_process_relocs(const General_options& options, Symbol_table* symtab,
- Layout* layout, Read_relocs_data* rd)
- { return this->do_gc_process_relocs(options, symtab, layout, rd); }
+ gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd)
+ { return this->do_gc_process_relocs(symtab, layout, rd); }
// Scan the relocs and adjust the symbol table.
void
- scan_relocs(const General_options& options, Symbol_table* symtab,
- Layout* layout, Read_relocs_data* rd)
- { return this->do_scan_relocs(options, symtab, layout, rd); }
+ scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd)
+ { return this->do_scan_relocs(symtab, layout, rd); }
// The number of local symbols in the input symbol table.
virtual unsigned int
// 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); }
+ finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab)
+ { return this->do_finalize_local_symbols(index, off, symtab); }
// Set the output dynamic symbol table indexes for the local variables.
unsigned int
// Relocate the input sections and write out the local symbols.
void
- relocate(const General_options& options, const Symbol_table* symtab,
- const Layout* layout, Output_file* of)
- { return this->do_relocate(options, symtab, layout, of); }
+ relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of)
+ { return this->do_relocate(symtab, layout, of); }
// Return whether an input section is being included in the link.
bool
return this->output_sections_[shndx] != NULL;
}
- // 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
+ // The 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
+ set_output_section(unsigned int shndx, Output_section* os)
{
gold_assert(shndx < this->output_sections_.size());
- return this->output_sections_[shndx];
+ this->output_sections_[shndx] = os;
}
-
- // 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, uint64_t off)
layout_deferred_sections(Layout* layout)
{ this->do_layout_deferred_sections(layout); }
+ // Return the index of the first incremental relocation for symbol SYMNDX.
+ virtual unsigned int
+ do_get_incremental_reloc_base(unsigned int symndx) const
+ { return this->reloc_bases_[symndx]; }
+
+ // Return the number of incremental relocations for symbol SYMNDX.
+ virtual unsigned int
+ do_get_incremental_reloc_count(unsigned int symndx) const
+ { return this->reloc_counts_[symndx]; }
+
protected:
// The output section to be used for each input section, indexed by
// the input section number. The output section is NULL if the
// Process the relocs--implemented by child class.
virtual void
- do_gc_process_relocs(const General_options&, Symbol_table*, Layout*,
- Read_relocs_data*) = 0;
+ do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0;
// Scan the relocs--implemented by child class.
virtual void
- do_scan_relocs(const General_options&, Symbol_table*, Layout*,
- Read_relocs_data*) = 0;
+ do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0;
// Return the number of local symbols--implemented by child class.
virtual unsigned int
// 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;
+ do_finalize_local_symbols(unsigned int, off_t, Symbol_table*) = 0;
// Set the output dynamic symbol table indexes for the local variables.
virtual unsigned int
// Relocate the input sections and write out the local
// symbols--implemented by child class.
virtual void
- 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;
+ do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0;
// Set the offset of a section--implemented by child class.
virtual void
virtual void
do_layout_deferred_sections(Layout*) = 0;
+ // 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*
+ do_output_section(unsigned int shndx) const
+ {
+ gold_assert(shndx < this->output_sections_.size());
+ return this->output_sections_[shndx];
+ }
+
// Return the vector mapping input sections to output sections.
Output_sections&
output_sections()
set_relocs_must_follow_section_writes()
{ this->relocs_must_follow_section_writes_ = true; }
+ // Allocate the array for counting incremental relocations.
+ void
+ allocate_incremental_reloc_counts()
+ {
+ unsigned int nsyms = this->do_get_global_symbols()->size();
+ this->reloc_counts_ = new unsigned int[nsyms];
+ gold_assert(this->reloc_counts_ != NULL);
+ memset(this->reloc_counts_, 0, nsyms * sizeof(unsigned int));
+ }
+
+ // Record a relocation in this object referencing global symbol SYMNDX.
+ // Used for tracking incremental link information.
+ void
+ count_incremental_reloc(unsigned int symndx)
+ {
+ unsigned int nsyms = this->do_get_global_symbols()->size();
+ gold_assert(symndx < nsyms);
+ gold_assert(this->reloc_counts_ != NULL);
+ ++this->reloc_counts_[symndx];
+ }
+
+ // Finalize the incremental relocation information.
+ void
+ finalize_incremental_relocs(Layout* layout);
+
+ // Return the index of the next relocation to be written for global symbol
+ // SYMNDX. Only valid after finalize_incremental_relocs() has been called.
+ unsigned int
+ next_incremental_reloc_index(unsigned int symndx)
+ {
+ unsigned int nsyms = this->do_get_global_symbols()->size();
+
+ gold_assert(this->reloc_counts_ != NULL);
+ gold_assert(this->reloc_bases_ != NULL);
+ gold_assert(symndx < nsyms);
+
+ unsigned int counter = this->reloc_counts_[symndx]++;
+ return this->reloc_bases_[symndx] + counter;
+ }
+
private:
// Mapping from input sections to output section.
Output_sections output_sections_;
// Again used during garbage collection when laying out referenced
// sections.
gold::Symbols_data *sd_;
+ // Per-symbol counts of relocations, for incremental links.
+ unsigned int* reloc_counts_;
+ // Per-symbol base indexes of relocations, for incremental links.
+ unsigned int* reloc_bases_;
};
// This class is used to handle relocations against a section symbol
Symbol_value()
: 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)
+ is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true)
{ this->u_.value = 0; }
// Get the value of this symbol. OBJECT is the object in which this
input_value() const
{ return this->u_.value; }
- // Return whether this symbol should go into the output symbol
+ // Return whether we have set the index in the output symbol table
+ // yet.
+ bool
+ is_output_symtab_index_set() const
+ {
+ return (this->output_symtab_index_ != 0
+ && this->output_symtab_index_ != -2U);
+ }
+
+ // Return whether this symbol may be discarded from the normal
+ // symbol table.
+ bool
+ may_be_discarded_from_output_symtab() const
+ {
+ gold_assert(!this->is_output_symtab_index_set());
+ return this->output_symtab_index_ != -2U;
+ }
+
+ // Return whether this symbol has an entry in the output symbol
// table.
bool
- needs_output_symtab_entry() const
- { return this->output_symtab_index_ != -1U; }
+ has_output_symtab_entry() const
+ {
+ gold_assert(this->is_output_symtab_index_set());
+ return this->output_symtab_index_ != -1U;
+ }
// Return the index in the output symbol table.
unsigned int
output_symtab_index() const
{
- gold_assert(this->output_symtab_index_ != 0);
+ gold_assert(this->is_output_symtab_index_set()
+ && this->output_symtab_index_ != -1U);
return this->output_symtab_index_;
}
void
set_output_symtab_index(unsigned int i)
{
- gold_assert(this->output_symtab_index_ == 0);
+ gold_assert(!this->is_output_symtab_index_set());
+ gold_assert(i != 0 && i != -1U && i != -2U);
this->output_symtab_index_ = i;
}
this->output_symtab_index_ = -1U;
}
+ // Record that this symbol must go into the output symbol table,
+ // because it there is a relocation that uses it.
+ void
+ set_must_have_output_symtab_entry()
+ {
+ gold_assert(!this->is_output_symtab_index_set());
+ this->output_symtab_index_ = -2U;
+ }
+
// Set the index in the output dynamic symbol table.
void
set_needs_output_dynsym_entry()
this->output_dynsym_index_ = 0;
}
- // Return whether this symbol should go into the output symbol
+ // Return whether this symbol should go into the dynamic symbol
// table.
bool
needs_output_dynsym_entry() const
return this->output_dynsym_index_ != -1U;
}
+ // Return whether this symbol has an entry in the dynamic symbol
+ // table.
+ bool
+ has_output_dynsym_entry() const
+ {
+ gold_assert(this->output_dynsym_index_ != 0);
+ 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);
+ gold_assert(i != 0 && i != -1U);
this->output_dynsym_index_ = i;
}
set_is_tls_symbol()
{ this->is_tls_symbol_ = true; }
- // Return TRUE if this is a TLS symbol.
+ // Return true if this is a TLS symbol.
bool
is_tls_symbol() const
{ return this->is_tls_symbol_; }
+ // Record that this is an IFUNC symbol.
+ void
+ set_is_ifunc_symbol()
+ { this->is_ifunc_symbol_ = true; }
+
+ // Return true if this is an IFUNC symbol.
+ bool
+ is_ifunc_symbol() const
+ { return this->is_ifunc_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.
+ // will be 0 if no value has been assigned yet, and the symbol may
+ // be omitted. This will be -1U if the symbol should not go into
+ // the symbol table. This will be -2U if the symbol must go into
+ // the symbol table, but no index has been assigned yet.
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.
+ // will be -1U 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_ : 28;
+ unsigned int input_shndx_ : 27;
// Whether the section index is an ordinary index, not a special
// value.
bool is_ordinary_shndx_ : 1;
bool is_section_symbol_ : 1;
// Whether this is a STT_TLS symbol.
bool is_tls_symbol_ : 1;
+ // Whether this is a STT_GNU_IFUNC symbol.
+ bool is_ifunc_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
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;
+ }
+
+ // Loop over all GOT offset entries, applying the function F to each.
+ template<typename F>
+ void
+ for_all_got_offsets(F f) const
+ {
+ 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_);
+ }
+
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; }
+
+ const Symbol*
+ operator[](size_t i) const
+ { return this->vec_[i]; }
+
+ private:
+ std::vector<Symbol*> vec_;
+};
+
+// Type for mapping section index to uncompressed size.
+
+typedef std::map<unsigned int, section_size_type> Compressed_section_map;
+
// A regular object file. This is size and endian specific.
template<int size, bool big_endian>
is_output_section_offset_invalid(unsigned int shndx) const
{ return this->get_output_section_offset(shndx) == invalid_address; }
- // Set up the object file based on the ELF header.
+ // Set up the object file based on TARGET.
void
- setup(const typename elfcpp::Ehdr<size, big_endian>&);
+ setup()
+ { this->do_setup(); }
// Return the number of symbols. This is only valid after
// Object::add_symbols has been called.
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 must be in the output symbol table.
+ void
+ set_must_have_output_symtab_entry(unsigned int sym)
+ {
+ gold_assert(sym < this->local_values_.size());
+ this->local_values_[sym].set_must_have_output_symtab_entry();
+ }
// Record that local symbol SYM needs a dynamic symbol entry.
void
}
}
+ // 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
map_to_kept_section(unsigned int shndx, bool* found) const;
protected:
+ // Set up.
+ virtual void
+ do_setup();
+
// Read the symbols.
void
do_read_symbols(Read_symbols_data*);
// Add the symbols to the symbol table.
void
- do_add_symbols(Symbol_table*, Read_symbols_data*);
+ do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*);
+
+ Archive::Should_include
+ do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
+ std::string* why);
// Read the relocs.
void
// Process the relocs to find list of referenced sections. Used only
// during garbage collection.
void
- do_gc_process_relocs(const General_options&, Symbol_table*, Layout*,
- Read_relocs_data*);
+ do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*);
// Scan the relocs and adjust the symbol table.
void
- do_scan_relocs(const General_options&, Symbol_table*, Layout*,
- Read_relocs_data*);
+ do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*);
// Count the local symbols.
void
// Finalize the local symbols.
unsigned int
- do_finalize_local_symbols(unsigned int, off_t);
+ do_finalize_local_symbols(unsigned int, off_t, Symbol_table*);
// Set the offset where local dynamic symbol information will be stored.
unsigned int
// 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);
+ do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of);
// Get the size of a section.
uint64_t
// Return section flags.
uint64_t
- do_section_flags(unsigned int shndx)
- { return this->elf_file_.section_flags(shndx); }
+ do_section_flags(unsigned int shndx);
+
+ // Return section entsize.
+ uint64_t
+ do_section_entsize(unsigned int shndx);
// Return section address.
uint64_t
void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
+ // Get the global symbols.
+ const Symbols*
+ do_get_global_symbols() const
+ { return &this->symbols_; }
+
// Get the offset of a section.
uint64_t
do_output_section_offset(unsigned int shndx) const
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);
+ 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)
+ {
+ if (shndx >= elfcpp::SHN_LORESERVE)
+ shndx += this->elf_file_.large_shndx_offset();
+ return shndx;
+ }
+
+ // 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();
+
+ // Return symbol table section index.
+ unsigned int
+ symtab_shndx() const
+ { return this->symtab_shndx_; }
+
+ // Allow a child class to access the ELF file.
+ elfcpp::Elf_file<size, big_endian, Object>*
+ elf_file()
+ { return &this->elf_file_; }
+
+ // Allow a child class to access the local values.
+ Local_values*
+ local_values()
+ { return &this->local_values_; }
+
+ // Views and sizes when relocating.
+ struct View_size
+ {
+ unsigned char* view;
+ typename elfcpp::Elf_types<size>::Elf_Addr address;
+ off_t offset;
+ section_size_type view_size;
+ bool is_input_output_view;
+ bool is_postprocessing_view;
+ };
+
+ typedef std::vector<View_size> Views;
+
+ // 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);
+
+ // 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;
}
private:
// kept section.
struct Kept_comdat_section
{
- Kept_comdat_section(Sized_relobj<size, big_endian>* object,
- unsigned int shndx)
- : object_(object), shndx_(shndx)
+ Kept_comdat_section(Relobj* a_object, unsigned int a_shndx)
+ : object(a_object), shndx(a_shndx)
{ }
- Sized_relobj<size, big_endian>* object_;
- unsigned int shndx_;
+ Relobj* object;
+ unsigned int shndx;
};
- typedef std::map<unsigned int, Kept_comdat_section*>
+ 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);
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;
- section_size_type view_size;
- bool is_input_output_view;
- bool is_postprocessing_view;
- };
-
- typedef std::vector<View_size> Views;
-
// Write section data to the output file. Record the views and
// sizes in VIEWS for use when relocating.
void
// Relocate the sections in the output file.
void
- relocate_sections(const General_options& options, const Symbol_table*,
- const Layout*, const unsigned char* pshdrs, Views*);
+ relocate_sections(const Symbol_table* symtab, const Layout* layout,
+ const unsigned char* pshdrs, Output_file* of,
+ Views* pviews)
+ { this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); }
// Scan the input relocations for --emit-relocs.
void
- emit_relocs_scan(const General_options&, Symbol_table*, Layout*,
- const unsigned char* plocal_syms,
+ emit_relocs_scan(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*,
+ emit_relocs_scan_reltype(Symbol_table*, Layout*,
const unsigned char* plocal_syms,
const Read_relocs_data::Relocs_list::iterator&,
Relocatable_relocs*);
unsigned char* reloc_view,
section_size_type reloc_view_size);
- // Initialize input to output maps for section symbols in merged
- // sections.
+ // Scan the input relocations for --incremental.
void
- initialize_input_to_output_maps();
+ incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&);
- // Free the input to output maps for section symbols in merged
- // sections.
+ // Scan the input relocations for --incremental, templatized on the
+ // type of the relocation section.
+ template<int sh_type>
void
- free_input_to_output_maps();
+ incremental_relocs_scan_reltype(
+ const Read_relocs_data::Relocs_list::iterator&);
+
+ void
+ incremental_relocs_write(const Relocate_info<size, big_endian>*,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section*,
+ Address output_offset,
+ Output_file*);
+
+ template<int sh_type>
+ void
+ incremental_relocs_write_reltype(const Relocate_info<size, big_endian>*,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section*,
+ Address output_offset,
+ Output_file*);
+
+ // A type shared by split_stack_adjust_reltype and find_functions.
+ typedef std::map<section_offset_type, section_size_type> Function_offsets;
+
+ // Check for -fsplit-stack routines calling non-split-stack routines.
+ void
+ split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs,
+ 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);
+
+ template<int sh_type>
+ void
+ split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs,
+ unsigned int shndx, const unsigned char* prelocs,
+ size_t reloc_count, unsigned char* view,
+ section_size_type view_size,
+ Reloc_symbol_changes** reloc_map);
+
+ // Find all functions in a section.
+ void
+ find_functions(const unsigned char* pshdrs, unsigned int shndx,
+ Function_offsets*);
// Write out the local symbols.
void
{
this->local_values_.clear();
this->local_got_offsets_.clear();
+ this->local_plt_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)
+ set_kept_comdat_section(unsigned int shndx, Relobj* kept_object,
+ unsigned int kept_shndx)
{
- this->kept_comdat_sections_[shndx] = kept;
+ Kept_comdat_section kept(kept_object, kept_shndx);
+ this->kept_comdat_sections_.insert(std::make_pair(shndx, kept));
}
- // Find the kept section corresponding to the discarded section SHNDX.
- Kept_comdat_section*
- get_kept_comdat_section(unsigned int shndx) const
+ // 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
{
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;
+ return false;
+ *kept_object = p->second.object;
+ *kept_shndx = p->second.shndx;
+ 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;
- // 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
- // symbol, or a pair of GOT entries containing the module index and
- // dtv-relative offset.
- struct Tls_got_entry
- {
- Tls_got_entry(int got_offset, bool have_pair)
- : got_offset_(got_offset),
- have_pair_(have_pair)
- { }
- int got_offset_;
- bool have_pair_;
- };
- typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets;
+ // The PLT offsets of local symbols.
+ typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets;
// Saved information for sections whose layout was deferred.
struct Deferred_layout
// 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_;
- // Table of kept comdat groups.
- Comdat_group_table comdat_groups_;
// 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_;
// 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_;
};
// A class to manage the list of all objects.
{
public:
Input_objects()
- : relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_(),
- cref_(NULL)
+ : relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL)
{ }
// The type of the list of input relocateable objects.
void
print_symbol_counts(const Symbol_table*) const;
+ // Print a cross reference table.
+ void
+ print_cref(const Symbol_table*, FILE*) const;
+
// Iterate over all regular objects.
Relobj_iterator
any_dynamic() const
{ return !this->dynobj_list_.empty(); }
+ // Return the number of non dynamic objects.
+ int
+ number_of_relobjs() const
+ { return this->relobj_list_.size(); }
+
// Return the number of input objects.
int
number_of_input_objects() const
Dynobj_list dynobj_list_;
// SONAMEs that we have seen.
Unordered_set<std::string> sonames_;
- // The directory in which we find the libc.so.
- std::string system_library_directory_;
// Manage cross-references if requested.
Cref* cref_;
};
template<int size, bool big_endian>
struct Relocate_info
{
- // Command line options.
- const General_options* options;
// Symbol table.
const Symbol_table* symtab;
// Layout.
Sized_relobj<size, big_endian>* object;
// Section index of relocation section.
unsigned int reloc_shndx;
+ // Section header of relocation section.
+ const unsigned char* reloc_shdr;
// Section index of section being relocated.
unsigned int data_shndx;
+ // Section header of data section.
+ const unsigned char* data_shdr;
// Return a string showing the location of a relocation. This is
// only used for error messages.
location(size_t relnum, off_t reloffset) const;
};
+// 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;
+
+// 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;
+
+// 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
+// this in an unordered container that we want to traverse in a repeatable
+// manner.
+
+struct Section_id_hash
+{
+ size_t operator()(const Section_id& loc) const
+ { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; }
+};
+
+struct Const_section_id_hash
+{
+ size_t operator()(const Const_section_id& loc) const
+ { return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; }
+};
+
+// Return whether INPUT_FILE contains an ELF object start at file
+// offset OFFSET. This sets *START to point to a view of the start of
+// the file. It sets *READ_SIZE to the number of bytes in the view.
+
+extern bool
+is_elf_object(Input_file* input_file, off_t offset,
+ const unsigned char** start, int *read_size);
+
// Return an Object appropriate for the input file. P is BYTES long,
-// and holds the ELF header.
+// and holds the ELF header. If PUNCONFIGURED is not NULL, then if
+// this sees an object the linker is not configured to support, it
+// sets *PUNCONFIGURED to true and returns NULL without giving an
+// error message.
extern Object*
make_elf_object(const std::string& name, Input_file*,
off_t offset, const unsigned char* p,
- section_offset_type bytes);
+ section_offset_type bytes, bool* punconfigured);
} // end namespace gold
projects / binutils-gdb.git / blobdiff