252 lines
10 KiB
C++
252 lines
10 KiB
C++
#include "elna/parser.hpp"
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#include "elna/riscv.hpp"
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#include <memory>
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#include <cstring>
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namespace elna
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{
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Instruction::Instruction(BaseOpcode opcode)
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{
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this->instruction = static_cast<std::underlying_type<BaseOpcode>::type>(opcode);
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}
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Instruction& Instruction::i(XRegister rd, Funct3 funct3, XRegister rs1, std::uint32_t immediate)
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{
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this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7)
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| (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
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| (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
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| (immediate << 20);
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return *this;
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}
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Instruction& Instruction::s(std::uint32_t imm1, Funct3 funct3, XRegister rs1, XRegister rs2)
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{
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this->instruction |= ((imm1 & 0b11111) << 7)
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| (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
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| (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
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| (static_cast<std::underlying_type<XRegister>::type>(rs2) << 20)
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| ((imm1 & 0b111111100000) << 20);
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return *this;
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}
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Instruction& Instruction::r(XRegister rd, Funct3 funct3, XRegister rs1, XRegister rs2, Funct7 funct7)
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{
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this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7)
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| (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
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| (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
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| (static_cast<std::underlying_type<XRegister>::type>(rs2) << 20)
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| (static_cast<std::underlying_type<Funct7>::type>(funct7) << 25);
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return *this;
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}
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Instruction& Instruction::u(XRegister rd, std::uint32_t imm)
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{
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this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7) | (imm << 12);
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return *this;
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}
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const std::byte *Instruction::cbegin()
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{
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return reinterpret_cast<std::byte *>(&this->instruction);
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}
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const std::byte *Instruction::cend()
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{
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return reinterpret_cast<std::byte *>(&this->instruction) + sizeof(this->instruction);
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}
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void RiscVVisitor::visit(Node *)
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{
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}
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void RiscVVisitor::visit(Definition *definition)
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{
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++constCount;
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constNames = reinterpret_cast<const char **>(realloc(constNames, sizeof(const char *) * constCount));
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constValues = reinterpret_cast<std::int32_t *>(realloc(constValues, sizeof(std::int32_t) * constCount));
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constNames[constCount - 1] = definition->identifier;
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constValues[constCount - 1] = definition->number->value;
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}
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void RiscVVisitor::visit(Block *block)
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{
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for (std::size_t i = 0; i < block->definitionsLength; ++i)
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{
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block->definitions[i]->accept(this);
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}
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this->instructionsLength += 4;
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this->instructions = reinterpret_cast<Instruction *>(
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realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
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block->statement->accept(this);
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// Prologue.
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const uint stackSize = static_cast<std::uint32_t>(variableCounter * 4 + 12);
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this->instructions[0] = Instruction(BaseOpcode::opImm)
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.i(XRegister::sp, Funct3::addi, XRegister::sp, -stackSize);
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this->instructions[1] = Instruction(BaseOpcode::store)
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.s(stackSize - 4, Funct3::sw, XRegister::sp, XRegister::s0);
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this->instructions[2] = Instruction(BaseOpcode::store)
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.s(stackSize - 8, Funct3::sw, XRegister::sp, XRegister::ra);
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this->instructions[3] = Instruction(BaseOpcode::opImm)
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.i(XRegister::s0, Funct3::addi, XRegister::sp, stackSize);
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this->instructions = reinterpret_cast<Instruction*>(
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realloc(this->instructions, (this->instructionsLength + 10) * sizeof(Instruction)));
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// Print the result.
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
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.i(XRegister::a1, Funct3::addi, XRegister::a0, 0);
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this->references[0] = Reference();
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this->references[0].name = ".CL0";
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this->references[0].offset = instructionsLength * 4;
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this->references[0].target = Target::high20;
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::lui).u(XRegister::a5, 0);
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this->references[1] = Reference();
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this->references[1].name = ".CL0";
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this->references[1].offset = instructionsLength * 4;
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this->references[1].target = Target::lower12i;
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
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.i(XRegister::a0, Funct3::addi, XRegister::a5, 0);
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this->references[2] = Reference();
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this->references[2].name = "printf";
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this->references[2].offset = instructionsLength * 4;
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this->references[2].target = Target::text;
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::auipc).u(XRegister::ra, 0);
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::jalr)
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.i(XRegister::ra, Funct3::jalr, XRegister::ra, 0);
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// Set the return value (0).
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::op)
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.r(XRegister::a0, Funct3::_and, XRegister::zero, XRegister::zero);
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// Epilogue.
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::load)
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.i(XRegister::s0, Funct3::lw, XRegister::sp, stackSize - 4);
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::load)
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.i(XRegister::ra, Funct3::lw, XRegister::sp, stackSize - 8);
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
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.i(XRegister::sp, Funct3::addi, XRegister::sp, stackSize);
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this->instructions[instructionsLength++] = Instruction(BaseOpcode::jalr)
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.i(XRegister::zero, Funct3::jalr, XRegister::ra, 0);
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}
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void RiscVVisitor::visit(BangStatement *statement)
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{
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statement->expression->accept(this);
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}
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void RiscVVisitor::visit(Expression *operand)
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{
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if (dynamic_cast<Variable *>(operand) != nullptr)
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{
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return dynamic_cast<Variable *>(operand)->accept(this);
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}
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if (dynamic_cast<Number *>(operand) != nullptr)
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{
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return dynamic_cast<Number *>(operand)->accept(this);
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}
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}
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void RiscVVisitor::visit(Variable *variable)
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{
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std::size_t i = 0;
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for (; i < constCount; ++i)
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{
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if (std::strcmp(variable->identifier, constNames[i]) == 0)
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{
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break;
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}
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}
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const auto freeRegister = this->registerInUse ? XRegister::a0 : XRegister::t0;
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++this->instructionsLength;
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this->instructions = reinterpret_cast<Instruction *>(
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realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
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this->instructions[this->instructionsLength - 1] =
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Instruction(BaseOpcode::opImm) // movl $x, %eax; where $x is a number.
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.i(freeRegister, Funct3::addi, XRegister::zero, constValues[i]);
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}
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void RiscVVisitor::visit(Number *number)
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{
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const auto freeRegister = this->registerInUse ? XRegister::a0 : XRegister::t0;
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++this->instructionsLength;
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this->instructions = reinterpret_cast<Instruction *>(
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realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
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this->instructions[this->instructionsLength - 1] =
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Instruction(BaseOpcode::opImm) // movl $x, %eax; where $x is a number.
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.i(freeRegister, Funct3::addi, XRegister::zero, number->value);
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}
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void RiscVVisitor::visit(BinaryExpression *expression)
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{
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const auto lhs_register = this->registerInUse ? XRegister::a0 : XRegister::t0;
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this->registerInUse = true;
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expression->lhs->accept(this);
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++this->instructionsLength;
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this->instructions = reinterpret_cast<Instruction *>(
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realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
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this->instructions[instructionsLength - 1] = // movl %eax, -x(%rbp); where x is a number.
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Instruction(BaseOpcode::store)
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.s(static_cast<std::uint32_t>(this->variableCounter * 4), Funct3::sw, XRegister::sp, XRegister::a0);
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auto lhs_stack_position = ++this->variableCounter;
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this->registerInUse = false;
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expression->rhs->accept(this);
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this->instructionsLength += 2;
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this->instructions = reinterpret_cast<Instruction *>(
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realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
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this->instructions[instructionsLength - 2] = Instruction(BaseOpcode::load)
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.i(XRegister::a0, Funct3::lw, XRegister::sp,
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static_cast<std::int8_t>((lhs_stack_position - 1) * 4));
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// Calculate the result and assign it to a variable on the stack.
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switch (expression->_operator)
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{
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case BinaryOperator::sum:
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this->instructions[instructionsLength - 1] = Instruction(BaseOpcode::op)
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.r(lhs_register, Funct3::add, XRegister::a0, XRegister::t0);
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break;
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case BinaryOperator::subtraction:
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this->instructions[instructionsLength - 1] = Instruction(BaseOpcode::op)
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.r(lhs_register, Funct3::sub, XRegister::a0, XRegister::t0, Funct7::sub);
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break;
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case BinaryOperator::multiplication:
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this->instructions[instructionsLength - 1] = Instruction(BaseOpcode::op)
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.r(lhs_register, Funct3::mul, XRegister::a0, XRegister::t0, Funct7::muldiv);
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break;
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}
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}
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Symbol writeNext(Block *ast)
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{
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auto visitor = std::make_unique<RiscVVisitor>();
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visitor->visit(ast);
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Symbol program{ "main" };
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for (std::size_t i = 0; i < 3; ++i)
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{
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program.symbols[i] = visitor->references[i];
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}
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for (std::size_t i = 0; i < visitor->instructionsLength; ++i)
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{
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program.text.insert(program.text.cend(),
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visitor->instructions[i].cbegin(), visitor->instructions[i].cend());
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}
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return program;
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}
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}
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