126 lines
4.8 KiB
C++
126 lines
4.8 KiB
C++
#include "elna/cl.hpp"
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#include "elna/result.hpp"
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#include "elna/riscv.hpp"
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#include <cstddef>
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#include <elfio/elfio.hpp>
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#include <fstream>
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#include <sstream>
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namespace elna
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{
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char *readSource(const char *source)
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{
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const std::size_t bufferSize = 255;
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std::ifstream input_stream{ source };
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std::stringstream buffer;
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buffer << input_stream.rdbuf();
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input_stream.close();
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std::string contents = buffer.str();
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char *result = reinterpret_cast<char *>(malloc(contents.size() + 1));
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std::copy(std::cbegin(contents), std::cend(contents), result);
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result[contents.size()] = '\0';
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return result;
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}
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int compile(const std::filesystem::path& in_file, const std::filesystem::path& out_file)
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{
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ELFIO::elfio writer;
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// You can't proceed before this function call!
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writer.create(ELFIO::ELFCLASS32, ELFIO::ELFDATA2LSB);
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writer.set_os_abi(ELFIO::ELFOSABI_NONE);
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writer.set_type(ELFIO::ET_REL);
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writer.set_machine(ELFIO::EM_RISCV);
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auto sourceText = readSource(in_file.c_str());
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if (sourceText == nullptr)
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{
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return 3;
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}
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size_t tokensCount{ 0 };
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auto lex_result = source::lex(sourceText);
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free(sourceText);
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if (lex_result.has_errors())
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{
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for (const auto& compile_error : lex_result.errors())
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{
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printf("%lu:%lu: %s\n", compile_error.line(), compile_error.column(), compile_error.what());
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}
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return 1;
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}
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auto ast = source::parser(lex_result.success()).parse();
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if (ast == nullptr)
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{
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return 2;
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}
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auto program = writeNext(ast.get());
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// Create code section
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ELFIO::section* text_sec = writer.sections.add(".text");
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text_sec->set_type(ELFIO::SHT_PROGBITS);
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text_sec->set_flags(ELFIO::SHF_ALLOC | ELFIO::SHF_EXECINSTR);
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text_sec->set_addr_align(0x1);
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text_sec->set_data(reinterpret_cast<const char *>(program.text.data()), program.text.size());
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// Create string table section
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ELFIO::section* str_sec = writer.sections.add(".strtab");
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str_sec->set_type(ELFIO::SHT_STRTAB);
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// Create string table writer
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ELFIO::string_section_accessor stra(str_sec);
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// Add label name
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ELFIO::Elf32_Word str_index = stra.add_string("msg");
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// Create read only data section
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ELFIO::section* ro_sec = writer.sections.add(".rodata");
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ro_sec->set_type(ELFIO::SHT_PROGBITS);
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ro_sec->set_flags(ELFIO::SHF_ALLOC);
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ro_sec->set_addr_align(0x4);
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ro_sec->set_data("%d\n");
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// Create symbol table section
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ELFIO::section* sym_sec = writer.sections.add(".symtab");
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sym_sec->set_type(ELFIO::SHT_SYMTAB);
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sym_sec->set_info(2);
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sym_sec->set_addr_align(0x4);
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sym_sec->set_entry_size(writer.get_default_entry_size(ELFIO::SHT_SYMTAB));
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sym_sec->set_link(str_sec->get_index());
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// Create symbol table writer
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ELFIO::symbol_section_accessor syma(writer, sym_sec);
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auto label_sym = syma.add_symbol(stra, ".CL0", 0x00000000, strlen("%d\n") + 1,
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ELFIO::STB_LOCAL, ELFIO::STT_NOTYPE, 0, ro_sec->get_index());
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syma.add_symbol(stra, program.name, 0x00000000, program.text.size(),
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ELFIO::STB_GLOBAL, ELFIO::STT_FUNC, 0, text_sec->get_index());
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auto printf_sym = syma.add_symbol(stra, "printf", 0x00000000, 0,
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ELFIO::STB_GLOBAL, ELFIO::STT_NOTYPE, 0, ELFIO::SHN_UNDEF);
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// Create relocation table section
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ELFIO::section* rel_sec = writer.sections.add(".rel.text");
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rel_sec->set_type(ELFIO::SHT_REL);
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rel_sec->set_info(text_sec->get_index());
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rel_sec->set_addr_align(0x4);
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rel_sec->set_entry_size(writer.get_default_entry_size(ELFIO::SHT_REL));
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rel_sec->set_link(sym_sec->get_index());
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rel_sec->set_flags(ELFIO::SHF_ALLOC);
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// Create relocation table writer
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ELFIO::relocation_section_accessor rela(writer, rel_sec);
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// Add relocation entry (adjust address at offset 11)
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rela.add_entry(program.symbols[0].offset, label_sym, 26 /* ELFIO::R_RISCV_HI20 */);
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rela.add_entry(program.symbols[0].offset, label_sym, 51 /* ELFIO::R_RISCV_RELAX */);
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rela.add_entry(program.symbols[1].offset, label_sym, 27 /* ELFIO::R_RISCV_LO12_I */);
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rela.add_entry(program.symbols[1].offset, label_sym, 51 /* ELFIO::R_RISCV_RELAX */);
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rela.add_entry(program.symbols[2].offset, printf_sym, 18 /* ELFIO::R_RISCV_CALL */);
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rela.add_entry(program.symbols[2].offset, printf_sym, 51 /* ELFIO::R_RISCV_RELAX */);
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// Create ELF object file
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writer.save(out_file);
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return 0;
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}
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}
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