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Eugen Wissner
2022-06-05 15:16:04 +02:00
commit 9651c57760
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backend/riscv.cpp Normal file
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#include "elna/backend/riscv.hpp"
#include <cassert>
#include <functional>
#include <memory>
namespace elna::riscv
{
instruction::instruction(base_opcode opcode)
{
this->representation = static_cast<std::underlying_type<base_opcode>::type>(opcode);
}
instruction& instruction::i(x_register rd, funct3_t funct3, x_register rs1, std::uint32_t immediate)
{
this->representation |= (static_cast<std::underlying_type<x_register>::type>(rd) << 7)
| (static_cast<std::underlying_type<funct3_t>::type>(funct3) << 12)
| (static_cast<std::underlying_type<x_register>::type>(rs1) << 15)
| (immediate << 20);
return *this;
}
instruction& instruction::s(std::uint32_t imm, funct3_t funct3, x_register rs1, x_register rs2)
{
this->representation |= ((imm & 0x1f) << 7)
| (static_cast<std::underlying_type<funct3_t>::type>(funct3) << 12)
| (static_cast<std::underlying_type<x_register>::type>(rs1) << 15)
| (static_cast<std::underlying_type<x_register>::type>(rs2) << 20)
| ((imm & 0xfe0) << 20);
return *this;
}
instruction& instruction::b(std::uint32_t imm, funct3_t funct3, x_register rs1, x_register rs2)
{
this->representation |= ((imm & 0x800) >> 4) | ((imm & 0x1e) << 7)
| (static_cast<std::underlying_type<funct3_t>::type>(funct3) << 12)
| (static_cast<std::underlying_type<x_register>::type>(rs1) << 15)
| (static_cast<std::underlying_type<x_register>::type>(rs2) << 20)
| ((imm & 0x7e0) << 20) | ((imm & 0x1000) << 19);
return *this;
}
instruction& instruction::r(x_register rd, funct3_t funct3, x_register rs1, x_register rs2, funct7_t funct7)
{
this->representation |= (static_cast<std::underlying_type<x_register>::type>(rd) << 7)
| (static_cast<std::underlying_type<funct3_t>::type>(funct3) << 12)
| (static_cast<std::underlying_type<x_register>::type>(rs1) << 15)
| (static_cast<std::underlying_type<x_register>::type>(rs2) << 20)
| (static_cast<std::underlying_type<funct7_t>::type>(funct7) << 25);
return *this;
}
instruction& instruction::u(x_register rd, std::uint32_t imm)
{
this->representation |= (static_cast<std::underlying_type<x_register>::type>(rd) << 7) | (imm << 12);
return *this;
}
instruction& instruction::j(x_register rd, std::uint32_t imm)
{
this->representation |= (static_cast<std::underlying_type<x_register>::type>(rd) << 7)
| (imm & 0xff000) | ((imm & 0x800) << 9) | ((imm & 0x7fe) << 20) | ((imm & 0x100000) << 11);
return *this;
}
const std::byte *instruction::cbegin() const
{
return reinterpret_cast<const std::byte *>(&this->representation);
}
const std::byte *instruction::cend() const
{
return reinterpret_cast<const std::byte *>(&this->representation) + sizeof(this->representation);
}
static void relocate(std::string_view name, address_t target, std::vector<reference>& references,
std::vector<instruction>& instructions, std::shared_ptr<source::writer<std::byte>> writer)
{
references.push_back(reference());
references.back().name = name;
references.back().offset = writer->size() + instructions.size() * 4;
references.back().target = target;
}
static void prologue(std::vector<instruction>& instructions)
{
instructions.push_back(instruction(base_opcode::opImm));
instructions.push_back(instruction(base_opcode::store));
instructions.push_back(instruction(base_opcode::store));
instructions.push_back(instruction(base_opcode::opImm));
}
static void epilogue(const std::size_t stack_size, std::vector<instruction>& instructions)
{
instructions[0].i(x_register::sp, funct3_t::addi, x_register::sp, -stack_size);
instructions[1].s(0, funct3_t::sw, x_register::sp, x_register::s0);
instructions[2].s(4, funct3_t::sw, x_register::sp, x_register::ra);
instructions[3].i(x_register::s0, funct3_t::addi, x_register::sp, stack_size);
// Epilogue.
instructions.push_back(instruction(base_opcode::load)
.i(x_register::s0, funct3_t::lw, x_register::sp, 0));
instructions.push_back(instruction(base_opcode::load)
.i(x_register::ra, funct3_t::lw, x_register::sp, 4));
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::sp, funct3_t::addi, x_register::sp, stack_size));
instructions.push_back(instruction(base_opcode::jalr)
.i(x_register::zero, funct3_t::jalr, x_register::ra, 0));
}
static void generate_intrinsics(std::shared_ptr<source::writer<std::byte>> writer,
std::vector<reference>& references)
{
writer->sink("printf");
{
std::vector<instruction> instructions;
auto format_string = writer->sink(reinterpret_cast<const std::byte *>("%c\n\0"), 4);
prologue(instructions);
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a1, funct3_t::addi, x_register::zero, 't'));
instructions.push_back(instruction(base_opcode::branch)
.b(8, funct3_t::bne, x_register::zero, x_register::a0));
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a1, funct3_t::addi, x_register::zero, 'f'));
relocate(format_string, address_t::high20, references, instructions, writer);
instructions.push_back(instruction(base_opcode::lui).u(x_register::a5, 0));
relocate(format_string, address_t::lower12i, references, instructions, writer);
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a0, funct3_t::addi, x_register::a5, 0));
relocate("printf", address_t::text, references, instructions ,writer);
instructions.push_back(instruction(base_opcode::auipc).u(x_register::ra, 0));
instructions.push_back(instruction(base_opcode::jalr)
.i(x_register::ra, funct3_t::jalr, x_register::ra, 0));
epilogue(8, instructions);
writer->sink("writeb", reinterpret_cast<const std::byte *>(instructions.data()),
instructions.size() * sizeof(instruction));
}
{
std::vector<instruction> instructions;
auto format_string = writer->sink(reinterpret_cast<const std::byte *>("%d\n\0"), 4);
prologue(instructions);
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a1, funct3_t::addi, x_register::a0, 0));
relocate(format_string, address_t::high20, references, instructions, writer);
instructions.push_back(instruction(base_opcode::lui).u(x_register::a5, 0));
relocate(format_string, address_t::lower12i, references, instructions, writer);
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a0, funct3_t::addi, x_register::a5, 0));
relocate("printf", address_t::text, references, instructions, writer);
instructions.push_back(instruction(base_opcode::auipc).u(x_register::ra, 0));
instructions.push_back(instruction(base_opcode::jalr)
.i(x_register::ra, funct3_t::jalr, x_register::ra, 0));
epilogue(8, instructions);
writer->sink("writei", reinterpret_cast<const std::byte *>(instructions.data()),
instructions.size() * sizeof(instruction));
}
}
static void load_in_register(std::shared_ptr<source::operand> operand, const x_register target,
std::shared_ptr<source::procedure_info> procedure_info, std::vector<instruction>& instructions)
{
std::shared_ptr<source::integer_operand> integer_operand{ nullptr };
std::shared_ptr<source::variable_operand> variable_operand{ nullptr };
std::shared_ptr<source::temporary_variable> temporary_variable{ nullptr };
std::shared_ptr<source::variable_info> variable_symbol{ nullptr };
std::shared_ptr<source::parameter_info> parameter_symbol{ nullptr };
if ((integer_operand = std::dynamic_pointer_cast<source::integer_operand>(operand)) != nullptr)
{
instructions.push_back(instruction(base_opcode::opImm)
.i(target, funct3_t::addi, x_register::zero, integer_operand->value()));
}
else if ((variable_operand = std::dynamic_pointer_cast<source::variable_operand>(operand)) != nullptr)
{
const auto& name = procedure_info->scope()->lookup(variable_operand->name());
if ((variable_symbol = std::dynamic_pointer_cast<source::variable_info>(name)) != nullptr)
{
instructions.push_back(instruction(base_opcode::load)
.i(target, funct3_t::lw, x_register::s0, variable_symbol->offset));
}
else if ((parameter_symbol = std::dynamic_pointer_cast<source::parameter_info>(name)) != nullptr)
{
instructions.push_back(instruction(base_opcode::load)
.i(target, funct3_t::lw, x_register::s0, parameter_symbol->offset));
}
}
else if ((temporary_variable = std::dynamic_pointer_cast<source::temporary_variable>(operand)) != nullptr)
{
instructions.push_back(instruction(base_opcode::load));
instructions.back().i(target, funct3_t::lw, x_register::s0,
procedure_info->local_stack_size + 4 * temporary_variable->counter());
}
}
static void store_from_register(std::shared_ptr<source::operand> destination, const x_register target,
std::shared_ptr<source::procedure_info> procedure_info, std::vector<instruction>& instructions)
{
std::shared_ptr<source::variable_operand> variable_operand{ nullptr };
std::shared_ptr<source::temporary_variable> temporary_variable{ nullptr };
std::shared_ptr<source::variable_info> variable_symbol{ nullptr };
if ((variable_operand = std::dynamic_pointer_cast<source::variable_operand>(destination)) != nullptr)
{
variable_symbol = std::dynamic_pointer_cast<source::variable_info>(
procedure_info->scope()->lookup(variable_operand->name()));
instructions.push_back(instruction(base_opcode::store)
.s(variable_symbol->offset, funct3_t::sw, x_register::s0, target));
}
else if ((temporary_variable = std::dynamic_pointer_cast<source::temporary_variable>(destination)) != nullptr)
{
instructions.push_back(instruction(base_opcode::store));
instructions.back().s(procedure_info->local_stack_size + 4 * temporary_variable->counter(),
funct3_t::sw, x_register::s0, target);
}
}
static void perform_binary_operation(const source::binary_operator operation, std::shared_ptr<source::operand> lhs,
std::shared_ptr<source::operand> rhs, std::shared_ptr<source::operand> destination,
std::shared_ptr<source::procedure_info> procedure_info, std::vector<instruction>& instructions)
{
constexpr auto lhs_register = x_register::a0;
std::shared_ptr<source::variable_operand> variable_operand{ nullptr };
std::shared_ptr<source::temporary_variable> temporary_variable{ nullptr };
std::shared_ptr<source::variable_info> variable_symbol{ nullptr };
load_in_register(lhs, x_register::a0, procedure_info, instructions);
load_in_register(rhs, x_register::t0, procedure_info, instructions);
// Calculate the result and assign it to a variable on the stack.
switch (operation)
{
case source::binary_operator::sum:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::add, x_register::a0, x_register::t0));
break;
case source::binary_operator::subtraction:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sub, x_register::a0, x_register::t0, funct7_t::sub));
break;
case source::binary_operator::multiplication:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::mul, x_register::a0, x_register::t0, funct7_t::muldiv));
break;
case source::binary_operator::division:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::div, x_register::a0, x_register::t0, funct7_t::muldiv));
break;
case source::binary_operator::equals:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sub, x_register::a0, x_register::t0, funct7_t::sub));
instructions.push_back(instruction(base_opcode::opImm)
.i(lhs_register, funct3_t::sltiu, lhs_register, 1));
break;
case source::binary_operator::not_equals:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sub, x_register::a0, x_register::t0, funct7_t::sub));
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sltu, x_register::zero, lhs_register));
break;
case source::binary_operator::less:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sltu, x_register::a0, x_register::t0));
break;
case source::binary_operator::greater_equal:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::sltu, x_register::t0, x_register::a0));
break;
case source::binary_operator::greater:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::slt, x_register::a0, x_register::t0));
instructions.push_back(instruction(base_opcode::opImm)
.i(lhs_register, funct3_t::xori, lhs_register, 1));
break;
case source::binary_operator::less_equal:
instructions.push_back(instruction(base_opcode::op)
.r(lhs_register, funct3_t::slt, x_register::t0, x_register::a0));
instructions.push_back(instruction(base_opcode::opImm)
.i(lhs_register, funct3_t::xori, lhs_register, 1));
break;
}
store_from_register(destination, lhs_register, procedure_info, instructions);
}
std::vector<reference> generate(source::intermediate_code_generator generator,
std::shared_ptr<source::symbol_table> table, std::shared_ptr<source::writer<std::byte>> writer)
{
std::vector<reference> references;
generate_intrinsics(writer, references);
for (auto& [identifier, intermediate_code] : generator)
{
std::vector<instruction> instructions;
auto main_symbol = std::dynamic_pointer_cast<source::procedure_info>(table->lookup(identifier));
std::size_t argument_offset{ 0 };
const auto stack_size = static_cast<std::uint32_t>(
intermediate_code.variable_counter() * 4 + 8 + main_symbol->stack_size());
std::unordered_map<std::size_t, std::function<void(std::size_t)>> missing_labels;
std::unordered_map<std::size_t, std::function<void(std::size_t)>>::iterator missing_label =
missing_labels.end();
std::unordered_map<std::size_t, std::size_t> local_labels;
for (auto& quadruple : intermediate_code)
{
switch (quadruple.operation())
{
case source::quadruple_operator::start:
prologue(instructions);
break;
case source::quadruple_operator::stop:
epilogue(stack_size, instructions);
break;
case source::quadruple_operator::add:
perform_binary_operation(source::binary_operator::sum, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::sub:
perform_binary_operation(source::binary_operator::subtraction, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::mul:
perform_binary_operation(source::binary_operator::multiplication, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::div:
perform_binary_operation(source::binary_operator::division, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::eq:
perform_binary_operation(source::binary_operator::equals, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::neq:
perform_binary_operation(source::binary_operator::not_equals, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::lt:
perform_binary_operation(source::binary_operator::less, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::ge:
perform_binary_operation(source::binary_operator::greater_equal, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::gt:
perform_binary_operation(source::binary_operator::greater, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::le:
perform_binary_operation(source::binary_operator::less_equal, quadruple.operand1(),
quadruple.operand2(), quadruple.operand3(), main_symbol, instructions);
break;
case source::quadruple_operator::load:
{
auto operand_identifier =
std::dynamic_pointer_cast<source::variable_operand>(quadruple.operand1())->name();
auto variable_symbol = std::dynamic_pointer_cast<source::variable_info>(
main_symbol->scope()->lookup(operand_identifier));
load_in_register(quadruple.operand1(), x_register::a0, main_symbol, instructions);
instructions.push_back(instruction(base_opcode::load)
.i(x_register::a0, funct3_t::lw, x_register::a0, 0));
store_from_register(quadruple.operand3(), x_register::a0, main_symbol, instructions);
}
break;
case source::quadruple_operator::ref:
{
auto operand_identifier =
std::dynamic_pointer_cast<source::variable_operand>(quadruple.operand1())->name();
auto variable_symbol = std::dynamic_pointer_cast<source::variable_info>(
main_symbol->scope()->lookup(operand_identifier));
instructions.push_back(instruction(base_opcode::opImm)
.i(x_register::a0, funct3_t::addi, x_register::s0, variable_symbol->offset));
store_from_register(quadruple.operand3(), x_register::a0, main_symbol, instructions);
}
break;
case source::quadruple_operator::beqz:
load_in_register(quadruple.operand1(), x_register::a0, main_symbol, instructions);
instructions.push_back(instruction(base_opcode::branch));
missing_labels.emplace(
std::dynamic_pointer_cast<source::label_operand>(quadruple.operand3())->counter(),
[before_branch = instructions.size() - 1, &instructions](std::size_t target) {
instructions[before_branch].b((target - before_branch) * 4,
funct3_t::beq, x_register::zero, x_register::a0);
});
break;
case source::quadruple_operator::j:
{
auto local_label = local_labels.find(
std::dynamic_pointer_cast<source::label_operand>(quadruple.operand3())->counter());
if (local_label != local_labels.end())
{
auto offset = -(instructions.size() - local_label->second) * 4;
instructions.push_back(instruction(base_opcode::auipc).u(x_register::a0, 0));
instructions.push_back(instruction(base_opcode::jalr)
.i(x_register::zero, funct3_t::jalr, x_register::a0, offset));
}
}
break;
case source::quadruple_operator::label:
{
auto label_counter =
std::dynamic_pointer_cast<source::label_operand>(quadruple.operand3())->counter();
missing_label = missing_labels.find(label_counter);
if (missing_label != missing_labels.end())
{
missing_label->second(instructions.size());
}
local_labels[label_counter] = instructions.size();
}
break;
case source::quadruple_operator::assign:
load_in_register(quadruple.operand1(), x_register::a0, main_symbol, instructions);
store_from_register(quadruple.operand3(), x_register::a0, main_symbol, instructions);
break;
case source::quadruple_operator::param:
load_in_register(quadruple.operand1(), x_register::a0, main_symbol, instructions);
instructions.push_back(instruction(base_opcode::store)
.s(argument_offset, funct3_t::sw, x_register::sp, x_register::a0));
argument_offset += 4;
break;
case source::quadruple_operator::call:
relocate(std::dynamic_pointer_cast<source::variable_operand>(quadruple.operand1())->name(),
address_t::text, references, instructions, writer);
instructions.push_back(instruction(base_opcode::auipc).u(x_register::ra, 0));
instructions.push_back(instruction(base_opcode::jalr)
.i(x_register::ra, funct3_t::jalr, x_register::ra, 0));
argument_offset = 0;
break;
}
}
writer->sink(identifier,
reinterpret_cast<const std::byte *>(instructions.data()),
instructions.size() * sizeof(instruction));
}
return references;
}
}

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#include "elna/backend/target.hpp"
#include "elna/backend/riscv.hpp"
#include <cstring>
namespace elna::riscv
{
elfio_section_writer::iterator::reference elfio_section_writer::iterator::operator*() const noexcept
{
return payload;
}
elfio_section_writer::iterator::pointer elfio_section_writer::iterator::operator->() const noexcept
{
return &payload;
}
elfio_section_writer::iterator& elfio_section_writer::iterator::operator++()
{
this->payload.data += *this->sizes;
this->payload.label = *(++this->labels);
this->payload.size = *(++this->sizes);
return *this;
}
elfio_section_writer::iterator& elfio_section_writer::iterator::operator++(int)
{
auto tmp = *this;
++(*this);
return *this;
}
bool elfio_section_writer::iterator::operator==(const iterator& that) const
{
return this->labels == that.labels;
}
bool elfio_section_writer::iterator::operator!=(const iterator& that) const
{
return !(*this == that);
}
elfio_section_writer::elfio_section_writer(ELFIO::section *section)
: m_section(section)
{
}
void elfio_section_writer::operator()(const std::string& label, const std::byte *data, std::size_t size)
{
labels.push_back(label);
sizes.push_back(size);
m_section->append_data(reinterpret_cast<const char *>(data), size);
}
std::pair<std::string_view, bool> elfio_section_writer::operator()(const std::byte *data, std::size_t size)
{
auto found = std::find_if(begin(), end(),
[data, size](elfio_section_writer::entry entry) {
return size == entry.size && std::memcmp(entry.data, data, size) == 0;
});
if (found == end())
{
(*this)(".CL" + std::to_string(labels.size()), data, size);
return std::pair<std::string_view, bool>(labels.back(), true);
}
return std::pair<std::string_view, bool>(found->label, false);
}
elfio_section_writer::iterator elfio_section_writer::begin() const
{
return elfio_section_writer::iterator(labels.cbegin(), sizes.cbegin(),
reinterpret_cast<const std::byte *>(m_section->get_data()));
}
elfio_section_writer::iterator elfio_section_writer::end() const
{
return elfio_section_writer::iterator(labels.cend(), sizes.cend());
}
ELFIO::section *elfio_section_writer::section() noexcept
{
return m_section;
}
elfio_writer::elfio_writer(ELFIO::section *text, ELFIO::section *read_only,
ELFIO::symbol_section_accessor symbol_accessor, ELFIO::string_section_accessor string_accessor)
: text(text), read_only(elfio_section_writer(read_only)),
symbol_accessor(symbol_accessor), string_accessor(string_accessor)
{
}
std::size_t elfio_writer::sink(const std::string& label, const std::byte *data, std::size_t size)
{
auto offset = text->get_size();
text->append_data(reinterpret_cast<const char *>(data), size);
this->symbol_accessor.add_symbol(this->string_accessor, label.data(), offset, label.size(),
ELFIO::STB_GLOBAL, ELFIO::STT_FUNC, 0, text->get_index());
return text->get_size();
}
std::string_view elfio_writer::sink(const std::byte *data, std::size_t size)
{
auto offset = read_only.section()->get_size();
auto [result, inserted] = read_only(data, size);
if (inserted)
{
this->symbol_accessor.add_symbol(this->string_accessor, result.data(), offset,
result.size(), ELFIO::STB_LOCAL, ELFIO::STT_NOTYPE, 0,
read_only.section()->get_index());
}
return result;
}
void elfio_writer::sink(const std::string& label)
{
this->symbol_accessor.add_symbol(this->string_accessor, "printf", 0x00000000, 0,
ELFIO::STB_GLOBAL, ELFIO::STT_NOTYPE, 0, ELFIO::SHN_UNDEF);
}
std::size_t elfio_writer::size() const
{
return this->text->get_size();
}
std::ptrdiff_t lookup(ELFIO::symbol_section_accessor symbol_accessor, const std::string& label)
{
for (ptrdiff_t j = 0; j < symbol_accessor.get_symbols_num(); ++j)
{
std::string name;
ELFIO::Elf64_Addr value;
ELFIO::Elf_Xword size;
unsigned char bind;
unsigned char type;
ELFIO::Elf_Half section_index;
unsigned char other;
symbol_accessor.get_symbol(j, name, value, size, bind, type, section_index, other);
if (name == label)
{
return j;
}
}
return -1;
}
void riscv32_elf(source::program *ast, source::intermediate_code_generator intermediate_code_generator,
std::shared_ptr<source::symbol_table> table, const std::filesystem::path& out_file)
{
ELFIO::elfio writer;
writer.create(ELFIO::ELFCLASS32, ELFIO::ELFDATA2LSB);
writer.set_os_abi(ELFIO::ELFOSABI_NONE);
writer.set_type(ELFIO::ET_REL);
writer.set_flags(0x4); // EF_RISCV_FLOAT_ABI_DOUBLE
writer.set_machine(ELFIO::EM_RISCV);
// Create code section
ELFIO::section* text_sec = writer.sections.add(".text");
text_sec->set_type(ELFIO::SHT_PROGBITS);
text_sec->set_flags(ELFIO::SHF_ALLOC | ELFIO::SHF_EXECINSTR);
text_sec->set_addr_align(0x1);
// Create string table section
ELFIO::section* str_sec = writer.sections.add(".strtab");
str_sec->set_type(ELFIO::SHT_STRTAB);
// Create string table writer
ELFIO::string_section_accessor stra(str_sec);
// Create symbol table section
ELFIO::section* sym_sec = writer.sections.add(".symtab");
sym_sec->set_type(ELFIO::SHT_SYMTAB);
sym_sec->set_info(2);
sym_sec->set_addr_align(0x4);
sym_sec->set_entry_size(writer.get_default_entry_size(ELFIO::SHT_SYMTAB));
sym_sec->set_link(str_sec->get_index());
// Create relocation table section
ELFIO::section* rel_sec = writer.sections.add(".rel.text");
rel_sec->set_type(ELFIO::SHT_REL);
rel_sec->set_info(text_sec->get_index());
rel_sec->set_addr_align(0x4);
rel_sec->set_entry_size(writer.get_default_entry_size(ELFIO::SHT_REL));
rel_sec->set_link(sym_sec->get_index());
rel_sec->set_flags(ELFIO::SHF_ALLOC);
// Create read only data section
ELFIO::section* ro_sec = writer.sections.add(".rodata");
ro_sec->set_type(ELFIO::SHT_PROGBITS);
ro_sec->set_flags(ELFIO::SHF_ALLOC);
ro_sec->set_addr_align(0x4);
// Create symbol relocation table writers
ELFIO::symbol_section_accessor syma(writer, sym_sec);
ELFIO::relocation_section_accessor rela(writer, rel_sec);
auto _writer = std::make_shared<elfio_writer>(text_sec, ro_sec, syma, stra);
// visitor _visitor{ _writer, table };
// _visitor.visit(ast);
auto references = generate(intermediate_code_generator, table, _writer);
syma.arrange_local_symbols();
for (auto& reference : references)
// for (auto& reference : _visitor.references)
{
ELFIO::Elf_Word relocated_symbol = lookup(syma, reference.name);
switch (reference.target)
{
case address_t::high20:
rela.add_entry(reference.offset, relocated_symbol, 26 /* ELFIO::R_RISCV_HI20 */);
// rela.add_entry(reference.offset, relocated_symbol, 51 /* ELFIO::R_RISCV_RELAX */);
break;
case address_t::lower12i:
rela.add_entry(reference.offset, relocated_symbol, 27 /* ELFIO::R_RISCV_LO12_I */);
// rela.add_entry(reference.offset, relocated_symbol, 51 /* ELFIO::R_RISCV_RELAX */);
break;
case address_t::text:
rela.add_entry(reference.offset, relocated_symbol, 18 /* ELFIO::R_RISCV_CALL */);
// rela.add_entry(reference.offset, relocated_symbol, 51 /* ELFIO::R_RISCV_RELAX */);
break;
}
}
// Create ELF object file
writer.save(out_file);
}
}