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Assign variables

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This commit is contained in:
Eugen Wissner
2024-03-14 08:52:45 +01:00
parent 42d2038c4d
commit 8240443cd1
18 changed files with 700 additions and 339 deletions
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43
backend/riscv.cpp
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@ -63,7 +63,6 @@ namespace elna::riscv
void visitor::visit(source::definition *definition)
{
constants[definition->identifier()] = definition->body().number();
}
void visitor::visit(source::block *block)
@ -73,14 +72,7 @@ namespace elna::riscv
this->instructions.push_back(instruction(base_opcode::store));
this->instructions.push_back(instruction(base_opcode::opImm));
for (const auto& block_definition : block->definitions())
{
block_definition->accept(this);
}
for (const auto& block_declaration : block->declarations())
{
block_declaration->accept(this);
}
table = block->table();
block->body().accept(this);
// Set the return value (0).
@ -88,7 +80,9 @@ namespace elna::riscv
.r(x_register::a0, funct3_t::_and, x_register::zero, x_register::zero));
// Prologue.
const uint stack_size = static_cast<std::uint32_t>(variable_counter * 4 + 12);
auto main_symbol =
std::dynamic_pointer_cast<source::procedure_info>(table->lookup("main"));
const uint stack_size = static_cast<std::uint32_t>(variable_counter * 4 + 8 + main_symbol->stack_size());
this->instructions[0].i(x_register::sp, funct3_t::addi, x_register::sp, -stack_size);
this->instructions[1].s(stack_size - 4, funct3_t::sw, x_register::sp, x_register::s0);
@ -143,18 +137,37 @@ namespace elna::riscv
}
}
void visitor::visit(source::assignment_statement *statement)
void visitor::visit(source::assign_statement *statement)
{
const auto free_register = this->register_in_use ? x_register::a0 : x_register::t0;
auto symbol = table->lookup(statement->lvalue());
auto variable_symbol = std::dynamic_pointer_cast<source::variable_info>(symbol);
statement->rvalue().accept(this);
this->instructions.push_back(instruction(base_opcode::store)
.s(variable_symbol->offset, funct3_t::sw, x_register::s0, x_register::a0));
}
void visitor::visit(source::variable_expression *variable)
{
const auto free_register = this->register_in_use ? x_register::a0 : x_register::t0;
this->instructions.push_back(
instruction(base_opcode::opImm) // movl $x, %eax; where $x is a number.
.i(free_register, funct3_t::addi, x_register::zero, constants[variable->name()])
);
auto symbol = table->lookup(variable->name());
if (auto constant_symbol = std::dynamic_pointer_cast<source::constant_info>(symbol))
{
this->instructions.push_back(
instruction(base_opcode::opImm) // movl $x, %eax; where $x is a number.
.i(free_register, funct3_t::addi, x_register::zero, constant_symbol->value())
);
}
else if (auto variable_symbol = std::dynamic_pointer_cast<source::variable_info>(symbol))
{
this->instructions.push_back(
instruction(base_opcode::store)
.i(free_register, funct3_t::lw, x_register::s0, variable_symbol->offset)
);
}
}
void visitor::visit(source::integer_literal *number)