diff options
Diffstat (limited to 'gold/object.h')
| -rw-r--r-- | gold/object.h | 122 |
1 files changed, 102 insertions, 20 deletions
diff --git a/gold/object.h b/gold/object.h index b0ee015..0026531 100644 --- a/gold/object.h +++ b/gold/object.h @@ -4,6 +4,7 @@ #define GOLD_OBJECT_H #include <cassert> +#include <vector> #include "elfcpp.h" #include "fileread.h" @@ -13,6 +14,9 @@ namespace gold { +class Output_section; +class Layout; + // Data to pass from read_symbols() to add_symbols(). struct Read_symbols_data @@ -42,7 +46,8 @@ class Object Object(const std::string& name, Input_file* input_file, bool is_dynamic, off_t offset = 0) : name_(name), input_file_(input_file), offset_(offset), - is_dynamic_(is_dynamic), target_(NULL) + shnum_(0), is_dynamic_(is_dynamic), target_(NULL), + map_to_output_() { } virtual ~Object() @@ -58,21 +63,26 @@ class Object is_dynamic() const { return this->is_dynamic_; } - // Read the symbol and relocation information. - Read_symbols_data - read_symbols() - { return this->do_read_symbols(); } - - // Add symbol information to the global symbol table. - void - add_symbols(Symbol_table* symtab, Read_symbols_data rd) - { this->do_add_symbols(symtab, rd); } - // Return the target structure associated with this object. Target* - target() + target() const { return this->target_; } + // Lock the underlying file. + void + lock() + { this->input_file_->file().lock(); } + + // Unlock the underlying file. + void + unlock() + { this->input_file_->file().unlock(); } + + // Return whether the underlying file is locked. + bool + is_locked() const + { return this->input_file_->file().is_locked(); } + // Return the sized target structure associated with this object. // This is like the target method but it returns a pointer of // appropriate checked type. @@ -80,7 +90,35 @@ class Object Sized_target<size, big_endian>* sized_target(); + // Read the symbol and relocation information. + Read_symbols_data + read_symbols() + { return this->do_read_symbols(); } + + // Add symbol information to the global symbol table. + void + add_symbols(Symbol_table* symtab, Read_symbols_data rd) + { this->do_add_symbols(symtab, rd); } + + // Pass sections which should be included in the link to the Layout + // object, and record where the sections go in the output file. + void + layout(Layout* lay) + { this->do_layout(lay); } + 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 + { + // The output section. This is NULL if the input section is to be + // discarded. + Output_section* output_section; + // The offset within the output section. + off_t offset; + }; + // Read the symbols--implemented by child class. virtual Read_symbols_data do_read_symbols() = 0; @@ -90,6 +128,10 @@ class Object virtual void do_add_symbols(Symbol_table*, Read_symbols_data) = 0; + // Lay out sections--implemented by child class. + virtual void + do_layout(Layout*) = 0; + // Get the file. Input_file* input_file() const @@ -104,6 +146,16 @@ class Object const unsigned char* get_view(off_t start, off_t size); + // Get the number of sections. + unsigned int + shnum(void) const + { return this->shnum_; } + + // Set the number of sections. + void + set_shnum(int shnum) + { this->shnum_ = shnum; } + // Set the target. void set_target(Target* target) @@ -117,6 +169,11 @@ class Object File_view* get_lasting_view(off_t start, off_t size); + // Return the vector mapping input sections to output sections. + std::vector<Map_to_output>& + map_to_output() + { return this->map_to_output_; } + private: // This class may not be copied. Object(const Object&); @@ -129,10 +186,14 @@ class Object // Offset within the file--0 for an object file, non-0 for an // archive. off_t offset_; + // 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_; + // Mapping from input sections to output section. + std::vector<Map_to_output> map_to_output_; }; // Implement sized_target inline for efficiency. This approach breaks @@ -158,15 +219,23 @@ class Sized_object : public Object ~Sized_object(); + // Set up the object file based on the ELF header. void setup(const typename elfcpp::Ehdr<size, big_endian>&); + // Read the symbols. Read_symbols_data do_read_symbols(); + // Add the symbols to the symbol table. void do_add_symbols(Symbol_table*, Read_symbols_data); + // Lay out the input sections. + void + do_layout(Layout*); + + // Return the appropriate Sized_target structure. Sized_target<size, big_endian>* sized_target() { return this->Object::sized_target<size, big_endian>(); } @@ -176,18 +245,27 @@ class Sized_object : public Object Sized_object(const Sized_object&); Sized_object& operator=(const Sized_object&); - // ELF file header EI_OSABI field. - unsigned char osabi_; - // ELF file header EI_ABIVERSION field. - unsigned char abiversion_; - // ELF file header e_machine field. - elfcpp::Elf_Half machine_; + // For convenience. + typedef Sized_object<size, big_endian> This; + static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; + static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; + static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; + + // Whether to include a section group in the link. + bool + include_section_group(Layout*, unsigned int, + const elfcpp::Shdr<size, big_endian>&, + std::vector<bool>*); + + // Whether to include a linkonce section in the link. + bool + include_linkonce_section(Layout*, const char*, + const elfcpp::Shdr<size, big_endian>&); + // ELF file header e_flags field. unsigned int flags_; // File offset of section header table. off_t shoff_; - // Number of input sections. - unsigned int shnum_; // Offset of SHT_STRTAB section holding section names. unsigned int shstrndx_; // Index of SHT_SYMTAB section. @@ -196,6 +274,10 @@ class Sized_object : public Object Symbol** symbols_; }; +// The type of the list of input objects. + +typedef std::list<Object*> Object_list; + // Return an Object appropriate for the input file. P is BYTES long, // and holds the ELF header. |