diff options
Diffstat (limited to 'gold/output.h')
| -rw-r--r-- | gold/output.h | 142 |
1 files changed, 93 insertions, 49 deletions
diff --git a/gold/output.h b/gold/output.h index 95d95f6..fafd62b 100644 --- a/gold/output.h +++ b/gold/output.h @@ -432,15 +432,6 @@ class Output_section_data : public Output_data add_input_section(Relobj* object, unsigned int shndx) { return this->do_add_input_section(object, shndx); } - // This class may change the output section name. This is called - // right before shstrtab is written, so after all input-section - // layout processing is done. The input is the old name, and the - // output should be a new name (which will be copied into permanent - // storage) to change the name, or NULL to keep the name as-is. - virtual const char* - do_modified_output_section_name(const char*) - { return NULL; } - // Given an input OBJECT, an input section index SHNDX within that // object, and an OFFSET relative to the start of that input // section, return whether or not the corresponding offset within @@ -452,6 +443,12 @@ class Output_section_data : public Output_data off_t *poutput) const { return this->do_output_offset(object, shndx, offset, poutput); } + // Write the contents to a buffer. This is used for sections which + // require postprocessing, such as compression. + void + write_to_buffer(unsigned char* buffer) + { this->do_write_to_buffer(buffer); } + protected: // The child class must implement do_write. @@ -472,6 +469,13 @@ class Output_section_data : public Output_data do_output_offset(const Relobj*, unsigned int, off_t, off_t*) const { return false; } + // The child class may implement write_to_buffer. Most child + // classes can not appear in a compressed section, and they do not + // implement this. + virtual void + do_write_to_buffer(unsigned char*) + { gold_unreachable(); } + // Return the required alignment. uint64_t do_addralign() const @@ -545,6 +549,11 @@ class Output_data_const : public Output_section_data void do_write(Output_file*); + // Write the data to a buffer. + void + do_write_to_buffer(unsigned char* buffer) + { memcpy(buffer, this->data_.data(), this->data_.size()); } + private: std::string data_; }; @@ -565,6 +574,11 @@ class Output_data_const_buffer : public Output_section_data void do_write(Output_file*); + // Write the data to a buffer. + void + do_write_to_buffer(unsigned char* buffer) + { memcpy(buffer, this->p_, this->data_size()); } + private: const unsigned char* p_; }; @@ -629,6 +643,11 @@ class Output_data_strtab : public Output_section_data void do_write(Output_file*); + // Write the data to a buffer. + void + do_write_to_buffer(unsigned char* buffer) + { this->strtab_->write_to_buffer(buffer, this->data_size()); } + private: Stringpool* strtab_; }; @@ -1317,8 +1336,7 @@ class Output_section : public Output_data { public: // Create an output section, giving the name, type, and flags. - Output_section(const General_options& options, - const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword); + Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword); virtual ~Output_section(); // Add a new input section SHNDX, named NAME, with header SHDR, from @@ -1341,13 +1359,6 @@ class Output_section : public Output_data name() const { return this->name_; } - // Modify the section name. This should be called only after this - // section is done being constructed. The input should be a pointer - // into layout's namepool_. - void - set_name(const char* newname) - { this->name_ = newname; } - // Return the section type. elfcpp::Elf_Word type() const @@ -1506,11 +1517,23 @@ class Output_section : public Output_data requires_postprocessing() const { return this->requires_postprocessing_; } - // Record that this section requires postprocessing after all - // relocations have been applied. + // If a section requires postprocessing, return the buffer to use. + unsigned char* + postprocessing_buffer() const + { + gold_assert(this->postprocessing_buffer_ != NULL); + return this->postprocessing_buffer_; + } + + // If a section requires postprocessing, create the buffer to use. void - set_requires_postprocessing() - { this->requires_postprocessing_ = true; } + create_postprocessing_buffer(); + + // If a section requires postprocessing, this is the size of the + // buffer to which relocations should be applied. + off_t + postprocessing_buffer_size() const + { return this->current_data_size_for_child(); } // Return whether the offset OFFSET in the input section SHNDX in // object OBJECT is being included in the link. @@ -1535,16 +1558,6 @@ class Output_section : public Output_data write_header(const Layout*, const Stringpool*, elfcpp::Shdr_write<size, big_endian>*) const; - // This class may change the output section name. This is called - // right before shstrtab is written, so after all input-section - // layout processing is done. This calls - // do_modified_output_section_name() on all its output_section_data - // members, and changes the name if any member so suggests. If - // several members would suggest, this takes the first, arbitrarily. - // Return true if the name was modified, false else. - bool - maybe_modify_output_section_name(); - protected: // Return the section index in the output file. unsigned int @@ -1566,14 +1579,14 @@ class Output_section : public Output_data // Output_section, there is nothing to do, but if there are any // Output_section_data objects we need to set their final addresses // here. - void + virtual void 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 // on each input object. But if there are any Output_section_data // objects we do need to write them out here. - void + virtual void do_write(Output_file*); // Return the address alignment--function required by parent class. @@ -1596,6 +1609,36 @@ class Output_section : public Output_data do_is_section_flag_set(elfcpp::Elf_Xword flag) const { return (this->flags_ & flag) != 0; } + // Modify the section name. This is only permitted for an + // unallocated section, and only before the size has been finalized. + // Otherwise the name will not get into Layout::namepool_. + void + set_name(const char* newname) + { + gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0); + gold_assert(!this->is_data_size_valid()); + this->name_ = newname; + } + + // This may be implemented by a child class. + virtual void + do_finalize_name(Layout*) + { } + + // Record that this section requires postprocessing after all + // relocations have been applied. This is called by a child class. + void + set_requires_postprocessing() + { + this->requires_postprocessing_ = true; + this->after_input_sections_ = true; + } + + // Write all the data of an Output_section into the postprocessing + // buffer. + void + write_to_postprocessing_buffer(); + 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 @@ -1685,19 +1728,15 @@ class Output_section : public Output_data } // Set the address and file offset. This is called during - // Layout::finalize. SECOFF is the file offset of the enclosing - // section. + // Layout::finalize. SECTION_FILE_OFFSET is the file offset of + // the enclosing section. void - set_address(uint64_t addr, off_t off, off_t secoff); + set_address_and_file_offset(uint64_t address, off_t file_offset, + off_t section_file_offset); - // Call modified_output_section_name on the output-section-data object. - const char* - modified_output_section_name(const char* name) const - { - if (this->is_input_section()) - return NULL; - return this->u2_.posd->do_modified_output_section_name(name); - } + // Finalize the data size. + void + finalize_data_size(); // Add an input section, for SHF_MERGE sections. bool @@ -1721,6 +1760,11 @@ class Output_section : public Output_data void write(Output_file*); + // Write the data to a buffer. This does nothing for an input + // section. + void + write_to_buffer(unsigned char*); + private: // Code values which appear in shndx_. If the value is not one of // these codes, it is the input section index in the object file. @@ -1813,8 +1857,7 @@ class Output_section : public Output_data // handled. bool add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags, - uint64_t entsize, uint64_t addralign, - bool can_compress_section); + uint64_t entsize, uint64_t addralign); // Add an output SHF_MERGE section POSD to this output section. // IS_STRING indicates whether it is a SHF_STRINGS section, and @@ -1826,8 +1869,6 @@ class Output_section : public Output_data // Most of these fields are only valid after layout. - // General options. - const General_options& options_; // The name of the section. This will point into a Stringpool. const char* name_; // The section address is in the parent class. @@ -1869,6 +1910,9 @@ class Output_section : public Output_data // often will need fill sections without needing to keep track of // input sections. Fill_list fills_; + // If the section requires postprocessing, this buffer holds the + // section contents during relocation. + unsigned char* postprocessing_buffer_; // Whether this output section needs a STT_SECTION symbol in the // normal symbol table. This will be true if there is a relocation // which needs it. |