diff options
Diffstat (limited to 'gold/output.h')
| -rw-r--r-- | gold/output.h | 339 |
1 files changed, 241 insertions, 98 deletions
diff --git a/gold/output.h b/gold/output.h index 5239b60..05ed1f8 100644 --- a/gold/output.h +++ b/gold/output.h @@ -49,32 +49,44 @@ class Sized_relobj; class Output_data { public: - explicit Output_data(off_t data_size = 0) - : address_(0), data_size_(data_size), offset_(-1), + explicit Output_data() + : address_(0), data_size_(0), offset_(-1), + is_address_valid_(false), is_data_size_valid_(false), + is_offset_valid_(false), dynamic_reloc_count_(0) { } virtual ~Output_data(); - // Return the address. This is only valid after Layout::finalize is - // finished. + // Return the address. For allocated sections, this is only valid + // after Layout::finalize is finished. uint64_t address() const - { return this->address_; } + { + gold_assert(this->is_address_valid_); + return this->address_; + } - // Return the size of the data. This must be valid after - // Layout::finalize calls set_address, but need not be valid before - // then. + // Return the size of the data. For allocated sections, this must + // be valid after Layout::finalize calls set_address, but need not + // be valid before then. off_t data_size() const - { return this->data_size_; } + { + gold_assert(this->is_data_size_valid_); + return this->data_size_; + } // Return the file offset. This is only valid after - // Layout::finalize is finished. + // Layout::finalize is finished. For some non-allocated sections, + // it may not be valid until near the end of the link. off_t offset() const - { return this->offset_; } + { + gold_assert(this->is_offset_valid_); + return this->offset_; + } // Return the required alignment. uint64_t @@ -107,10 +119,46 @@ class Output_data set_out_shndx(unsigned int shndx) { this->do_set_out_shndx(shndx); } - // Set the address and file offset of this data. This is called - // during Layout::finalize. + // Set the address and file offset of this data, and finalize the + // size of the data. This is called during Layout::finalize for + // allocated sections. void - set_address(uint64_t addr, off_t off); + set_address_and_file_offset(uint64_t addr, off_t off) + { + this->set_address(addr); + this->set_file_offset(off); + this->finalize_data_size(); + } + + // Set the address. + void + set_address(uint64_t addr) + { + gold_assert(!this->is_address_valid_); + this->address_ = addr; + this->is_address_valid_ = true; + } + + // Set the file offset. + void + set_file_offset(off_t off) + { + gold_assert(!this->is_offset_valid_); + this->offset_ = off; + this->is_offset_valid_ = true; + } + + // Finalize the data size. + void + finalize_data_size() + { + if (!this->is_data_size_valid_) + { + // Tell the child class to set the data size. + this->set_final_data_size(); + gold_assert(this->is_data_size_valid_); + } + } // Write the data to the output file. This is called after // Layout::finalize is complete. @@ -118,16 +166,16 @@ class Output_data write(Output_file* file) { this->do_write(file); } - // This is called by Layout::finalize to note that all sizes must - // now be fixed. + // This is called by Layout::finalize to note that the sizes of + // allocated sections must now be fixed. static void layout_complete() - { Output_data::sizes_are_fixed = true; } + { Output_data::allocated_sizes_are_fixed = true; } // Used to check that layout has been done. static bool is_layout_complete() - { return Output_data::sizes_are_fixed; } + { return Output_data::allocated_sizes_are_fixed; } // Count the number of dynamic relocations applied to this section. void @@ -177,20 +225,51 @@ class Output_data do_set_out_shndx(unsigned int) { gold_unreachable(); } - // Set the address and file offset of the data. This only needs to - // be implemented if the child needs to know. The child class can - // set its size in this call. + // This is a hook for derived classes to set the data size. This is + // called by finalize_data_size, normally called during + // Layout::finalize, when the section address is set. virtual void - do_set_address(uint64_t, off_t) - { } + set_final_data_size() + { gold_unreachable(); } // Functions that child classes may call. + // Whether the address is valid. + bool + is_address_valid() const + { return this->is_address_valid_; } + + // Whether the file offset is valid. + bool + is_offset_valid() const + { return this->is_offset_valid_; } + + // Whether the data size is valid. + bool + is_data_size_valid() const + { return this->is_data_size_valid_; } + // Set the size of the data. void set_data_size(off_t data_size) { - gold_assert(!Output_data::sizes_are_fixed); + gold_assert(!this->is_data_size_valid_); + this->data_size_ = data_size; + this->is_data_size_valid_ = true; + } + + // Get the current data size--this is for the convenience of + // sections which build up their size over time. + off_t + current_data_size_for_child() const + { return this->data_size_; } + + // Set the current data size--this is for the convenience of + // sections which build up their size over time. + void + set_current_data_size_for_child(off_t data_size) + { + gold_assert(!this->is_data_size_valid_); this->data_size_ = data_size; } @@ -207,15 +286,22 @@ class Output_data Output_data& operator=(const Output_data&); // This is used for verification, to make sure that we don't try to - // change any sizes after we set the section addresses. - static bool sizes_are_fixed; + // change any sizes of allocated sections after we set the section + // addresses. + static bool allocated_sizes_are_fixed; - // Memory address in file (not always meaningful). + // Memory address in output file. uint64_t address_; - // Size of data in file. + // Size of data in output file. off_t data_size_; - // Offset within file. + // File offset of contents in output file. off_t offset_; + // Whether address_ is valid. + bool is_address_valid_; + // Whether data_size_ is valid. + bool is_data_size_valid_; + // Whether offset_ is valid. + bool is_offset_valid_; // Count of dynamic relocations applied to this section. unsigned int dynamic_reloc_count_; }; @@ -230,6 +316,7 @@ class Output_section_headers : public Output_data const Layout::Section_list*, const Stringpool*); + protected: // Write the data to the file. void do_write(Output_file*); @@ -258,6 +345,7 @@ class Output_segment_headers : public Output_data public: Output_segment_headers(const Layout::Segment_list& segment_list); + protected: // Write the data to the file. void do_write(Output_file*); @@ -290,6 +378,7 @@ class Output_file_header : public Output_data void set_section_info(const Output_section_headers*, const Output_section* shstrtab); + protected: // Write the data to the file. void do_write(Output_file*); @@ -299,12 +388,6 @@ class Output_file_header : public Output_data do_addralign() const { return Output_data::default_alignment(); } - // Set the address and offset--we only implement this for error - // checking. - void - do_set_address(uint64_t, off_t off) const - { gold_assert(off == 0); } - private: // Write the data to the file with the right size and endianness. template<int size, bool big_endian> @@ -327,11 +410,11 @@ class Output_section_data : public Output_data { public: Output_section_data(off_t data_size, uint64_t addralign) - : Output_data(data_size), output_section_(NULL), addralign_(addralign) - { } + : Output_data(), output_section_(NULL), addralign_(addralign) + { this->set_data_size(data_size); } Output_section_data(uint64_t addralign) - : Output_data(0), output_section_(NULL), addralign_(addralign) + : Output_data(), output_section_(NULL), addralign_(addralign) { } // Return the output section. @@ -401,6 +484,34 @@ class Output_section_data : public Output_data uint64_t addralign_; }; +// Some Output_section_data classes build up their data step by step, +// rather than all at once. This class provides an interface for +// them. + +class Output_section_data_build : public Output_section_data +{ + public: + Output_section_data_build(uint64_t addralign) + : Output_section_data(addralign) + { } + + // Get the current data size. + off_t + current_data_size() const + { return this->current_data_size_for_child(); } + + // Set the current data size. + void + set_current_data_size(off_t data_size) + { this->set_current_data_size_for_child(data_size); } + + protected: + // Set the final data size. + virtual void + set_final_data_size() + { this->set_data_size(this->current_data_size_for_child()); } +}; + // A simple case of Output_data in which we have constant data to // output. @@ -420,14 +531,7 @@ class Output_data_const : public Output_section_data data_(reinterpret_cast<const char*>(p), len) { } - // Add more data. - void - add_data(const std::string& add) - { - this->data_.append(add); - this->set_data_size(this->data_.size()); - } - + protected: // Write the data to the output file. void do_write(Output_file*); @@ -447,6 +551,7 @@ class Output_data_const_buffer : public Output_section_data : Output_section_data(len, addralign), p_(p) { } + protected: // Write the data the output file. void do_write(Output_file*); @@ -455,30 +560,42 @@ class Output_data_const_buffer : public Output_section_data const unsigned char* p_; }; -// A place holder for data written out via some other mechanism. +// A place holder for a fixed amount of data written out via some +// other mechanism. -class Output_data_space : public Output_section_data +class Output_data_fixed_space : public Output_section_data { public: - Output_data_space(off_t data_size, uint64_t addralign) + Output_data_fixed_space(off_t data_size, uint64_t addralign) : Output_section_data(data_size, addralign) { } - explicit Output_data_space(uint64_t addralign) - : Output_section_data(addralign) + protected: + // Write out the data--the actual data must be written out + // elsewhere. + void + do_write(Output_file*) { } +}; - // Set the size. - void - set_space_size(off_t space_size) - { this->set_data_size(space_size); } +// A place holder for variable sized data written out via some other +// mechanism. + +class Output_data_space : public Output_section_data_build +{ + public: + explicit Output_data_space(uint64_t addralign) + : Output_section_data_build(addralign) + { } // Set the alignment. void set_space_alignment(uint64_t align) { this->set_addralign(align); } - // Write out the data--this must be handled elsewhere. + protected: + // Write out the data--the actual data must be written out + // elsewhere. void do_write(Output_file*) { } @@ -493,10 +610,11 @@ class Output_data_strtab : public Output_section_data : Output_section_data(1), strtab_(strtab) { } + protected: // This is called to set the address and file offset. Here we make // sure that the Stringpool is finalized. void - do_set_address(uint64_t, off_t); + set_final_data_size(); // Write out the data. void @@ -743,7 +861,7 @@ class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> // the reloc type. template<int sh_type, bool dynamic, int size, bool big_endian> -class Output_data_reloc_base : public Output_section_data +class Output_data_reloc_base : public Output_section_data_build { public: typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type; @@ -753,14 +871,14 @@ class Output_data_reloc_base : public Output_section_data // Construct the section. Output_data_reloc_base() - : Output_section_data(Output_data::default_alignment_for_size(size)) + : Output_section_data_build(Output_data::default_alignment_for_size(size)) { } + protected: // Write out the data. void do_write(Output_file*); - protected: // Set the entry size and the link. void do_adjust_output_section(Output_section *os); @@ -770,7 +888,7 @@ class Output_data_reloc_base : public Output_section_data add(Output_data *od, const Output_reloc_type& reloc) { this->relocs_.push_back(reloc); - this->set_data_size(this->relocs_.size() * reloc_size); + this->set_current_data_size(this->relocs_.size() * reloc_size); od->add_dynamic_reloc(); } @@ -920,13 +1038,13 @@ class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> // needed. template<int size, bool big_endian> -class Output_data_got : public Output_section_data +class Output_data_got : public Output_section_data_build { public: typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; Output_data_got() - : Output_section_data(Output_data::default_alignment_for_size(size)), + : Output_section_data_build(Output_data::default_alignment_for_size(size)), entries_() { } @@ -964,6 +1082,7 @@ class Output_data_got : public Output_section_data return this->last_got_offset(); } + protected: // Write out the GOT table. void do_write(Output_file*); @@ -1039,7 +1158,7 @@ class Output_data_got : public Output_section_data // Set the size of the section. void set_got_size() - { this->set_data_size(this->got_offset(this->entries_.size())); } + { this->set_current_data_size(this->got_offset(this->entries_.size())); } // The list of GOT entries. Got_entries entries_; @@ -1085,19 +1204,19 @@ class Output_data_dynamic : public Output_section_data add_string(elfcpp::DT tag, const std::string& str) { this->add_string(tag, str.c_str()); } + protected: + // Adjust the output section to set the entry size. + void + do_adjust_output_section(Output_section*); + // Set the final data size. void - do_set_address(uint64_t, off_t); + set_final_data_size(); // Write out the dynamic entries. void do_write(Output_file*); - protected: - // Adjust the output section to set the entry size. - void - do_adjust_output_section(Output_section*); - private: // This POD class holds a single dynamic entry. class Dynamic_entry @@ -1222,22 +1341,6 @@ class Output_section : public Output_data flags() const { return this->flags_; } - // Return the section index in the output file. - unsigned int - do_out_shndx() const - { - gold_assert(this->out_shndx_ != -1U); - return this->out_shndx_; - } - - // Set the output section index. - void - do_set_out_shndx(unsigned int shndx) - { - gold_assert(this->out_shndx_ == -1U); - this->out_shndx_ = shndx; - } - // Return the entsize field. uint64_t entsize() const @@ -1380,6 +1483,18 @@ class Output_section : public Output_data set_after_input_sections() { this->after_input_sections_ = true; } + // Return whether this section requires postprocessing after all + // relocations have been applied. + bool + requires_postprocessing() const + { return this->requires_postprocessing_; } + + // Record that this section requires postprocessing after all + // relocations have been applied. + void + set_requires_postprocessing() + { this->requires_postprocessing_ = true; } + // Return whether the offset OFFSET in the input section SHNDX in // object OBJECT is being included in the link. bool @@ -1397,12 +1512,35 @@ class Output_section : public Output_data output_address(const Relobj* object, unsigned int shndx, off_t offset) const; - // Set the address of the Output_section. For a typical + // Write the section header into *OPHDR. + template<int size, bool big_endian> + void + write_header(const Layout*, const Stringpool*, + elfcpp::Shdr_write<size, big_endian>*) const; + + protected: + // Return the section index in the output file. + unsigned int + do_out_shndx() const + { + gold_assert(this->out_shndx_ != -1U); + return this->out_shndx_; + } + + // Set the output section index. + void + do_set_out_shndx(unsigned int shndx) + { + gold_assert(this->out_shndx_ == -1U); + this->out_shndx_ = shndx; + } + + // Set the final data size of the Output_section. For a typical // Output_section, there is nothing to do, but if there are any - // Output_section_data objects we need to set the final addresses + // Output_section_data objects we need to set their final addresses // here. void - do_set_address(uint64_t, off_t); + set_final_data_size(); // Write the data to the file. For a typical Output_section, this // does nothing: the data is written out by calling Object::Relocate @@ -1431,12 +1569,6 @@ class Output_section : public Output_data do_is_section_flag_set(elfcpp::Elf_Xword flag) const { return (this->flags_ & flag) != 0; } - // Write the section header into *OPHDR. - template<int size, bool big_endian> - void - write_header(const Layout*, const Stringpool*, - elfcpp::Shdr_write<size, big_endian>*) const; - private: // In some cases we need to keep a list of the input sections // associated with this output section. We only need the list if we @@ -1658,7 +1790,7 @@ class Output_section : public Output_data // Most of these fields are only valid after layout. // The name of the section. This will point into a Stringpool. - const char* name_; + const char* const name_; // The section address is in the parent class. // The section alignment. uint64_t addralign_; @@ -1674,9 +1806,9 @@ class Output_section : public Output_data // If info_section_ is NULL, this is the section info field. unsigned int info_; // The section type. - elfcpp::Elf_Word type_; + const elfcpp::Elf_Word type_; // The section flags. - elfcpp::Elf_Xword flags_; + const elfcpp::Elf_Xword flags_; // The section index. unsigned int out_shndx_; // If there is a STT_SECTION for this output section in the normal @@ -1715,6 +1847,9 @@ class Output_section : public Output_data // Whether this section should be written after all the input // sections are complete. bool after_input_sections_ : 1; + // Whether this section requires post processing after all + // relocations have been applied. + bool requires_postprocessing_ : 1; }; // An output segment. PT_LOAD segments are built from collections of @@ -1895,6 +2030,10 @@ class Output_file void open(off_t file_size); + // Resize the output file. + void + resize(off_t file_size); + // Close the output file and make sure there are no error. void close(); @@ -1945,6 +2084,10 @@ class Output_file { } private: + // Map the file into memory. + void + map(); + // General options. const General_options& options_; // Target. |