// 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.
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), xindex_(NULL), no_export_(false)
+ 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*
size_t* used) const
{ this->do_get_global_symbol_counts(symtab, defined, used); }
+ // 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
virtual void
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
+ virtual const Symbols*
+ do_get_global_symbols() const = 0;
+
// Set the number of sections.
void
set_shnum(int shnum)
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);
+
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_;
- // Many sections for objects with more than SHN_LORESERVE sections.
- Xindex* xindex_;
+ 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_;
+ bool no_export_ : 1;
+ // Many sections for objects with more than SHN_LORESERVE sections.
+ Xindex* xindex_;
};
// A regular object (ET_REL). This is an abstract base class itself.
// 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
// 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];
}
+ // 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());
+ 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.
// 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
// 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;
+ do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0;
// Get the offset of a section--implemented by child class.
virtual uint64_t
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_;
+};
+
// A regular object file. This is size and endian specific.
template<int size, bool big_endian>
// Set up the object file based on TARGET.
void
- setup();
+ setup()
+ { this->do_setup(); }
// Return the number of symbols. This is only valid after
// Object::add_symbols has been called.
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*);
// 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
// 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
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, 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; }
+
private:
// For convenience.
typedef Sized_relobj<size, big_endian> This;
typedef std::map<unsigned int, Kept_comdat_section>
Kept_comdat_section_table;
- // 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, Views* pviews)
+ { this->do_relocate_sections(symtab, layout, pshdrs, 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.
+ // 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
- initialize_input_to_output_maps();
+ 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);
- // Free the input to output maps for section symbols in merged
- // sections.
+ template<int sh_type>
void
- free_input_to_output_maps();
+ 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
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
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.
projects / deliverable / binutils-gdb.git / blobdiff