vc5/src/builder.cpp

#define DEFINE_BINARY_INSTRUCTIONS
#include "builder.hpp"
#include "vm.hpp"
#include <cstdint>
#include <print>
#include <utility>

using namespace vc5::tools;

namespace {

class InsBuilder {
public:
    InsBuilder(Op op)
        : m_ins(std::to_underlying(op))
    {
    }

    void build(Builder& vm) const
    {
        vm.push(m_ins);
        if (m_has_imm) {
            vm.push(m_imm);
        }
    }

    void set(uint16_t bit)
    {
        m_ins |= 1 << bit;
    }

    void reg(Reg reg, uint16_t bit, uint16_t mask)
    {
        m_ins |= (std::to_underlying(reg) & mask) << bit;
    }

    void op1_reg(Reg reg)
    {
        this->reg(reg, 10, 0b111);
    }

    void op2_reg(Reg reg)
    {
        this->reg(reg, 7, 0b111);
    }

    void dst_reg(Reg reg)
    {
        this->reg(reg, 13, 0b111);
    }

    void imm_without_flag(uint16_t imm)
    {
        m_imm = imm;
        m_has_imm = true;
    }

    void imm(uint16_t imm)
    {
        imm_without_flag(imm);
        set(6);
    }

private:
    uint16_t m_ins;
    uint16_t m_imm = 0;
    bool m_has_imm = false;
};

}

#define LOG_F                                                                  \
    {                                                                          \
        std::println("assembling {} at {}", __func__, this->m_ip);             \
    }

#define LOG

void Builder::nop()
{
    LOG;
    auto i = InsBuilder(Op::Nop);
    i.build(*this);
}

void Builder::hlt()
{
    LOG;
    auto i = InsBuilder(Op::Hlt);
    i.build(*this);
}

void Builder::jmp_reg(Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::Jmp);
    i.op1_reg(op1);
    i.build(*this);
}

void Builder::jmp_imm(uint16_t op1)
{
    LOG;
    auto i = InsBuilder(Op::Jmp);
    i.imm(op1);
    i.build(*this);
}

void Builder::jnz_reg(Reg op1, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::Jnz);
    i.op1_reg(op1);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::jnz_imm(Reg op1, uint16_t op2)
{
    LOG;
    auto i = InsBuilder(Op::Jnz);
    i.op1_reg(op1);
    i.imm(op2);
    i.build(*this);
}

void Builder::mov_reg(Reg dst, Reg src)
{
    LOG;
    auto i = InsBuilder(Op::Mov);
    i.reg(dst, 12, 0b1111);
    i.reg(src, 7, 0b1111);
    i.build(*this);
}

void Builder::mov_imm(Reg dst, uint16_t imm)
{
    LOG;
    auto i = InsBuilder(Op::Mov);
    i.reg(dst, 12, 0b1111);
    i.imm(imm);
    i.build(*this);
}

void Builder::ldw_reg(Reg dst, Reg addr, uint16_t offset)
{
    LOG;
    auto i = InsBuilder(Op::LdW);
    i.dst_reg(dst);
    i.op1_reg(addr);
    i.imm_without_flag(offset);
    i.build(*this);
}

void Builder::ldw_imm(Reg dst, uint16_t addr)
{
    LOG;
    auto i = InsBuilder(Op::LdW);
    i.dst_reg(dst);
    i.imm(addr);
    i.build(*this);
}

void Builder::stw_reg(Reg dst, uint16_t offset, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::StW);
    i.dst_reg(dst);
    i.imm_without_flag(offset);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::stw_imm(uint16_t dst, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::StW);
    i.imm(dst);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::ldb_reg(Reg dst, Reg addr, uint16_t offset)
{
    LOG;
    auto i = InsBuilder(Op::LdB);
    i.dst_reg(dst);
    i.op1_reg(addr);
    i.imm_without_flag(offset);
    i.build(*this);
}

void Builder::ldb_imm(Reg dst, uint16_t addr)
{
    LOG;
    auto i = InsBuilder(Op::LdB);
    i.dst_reg(dst);
    i.imm(addr);
    i.build(*this);
}

void Builder::stb_reg(Reg dst, uint16_t offset, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::StB);
    i.dst_reg(dst);
    i.imm_without_flag(offset);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::stb_imm(uint16_t dst, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::StB);
    i.imm(dst);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::cmp_reg(Reg op1, Reg op2)
{
    LOG;
    auto i = InsBuilder(Op::Cmp);
    i.op1_reg(op1);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::cmp_imm(Reg op1, uint16_t op2)
{
    LOG;
    auto i = InsBuilder(Op::Cmp);
    i.op1_reg(op1);
    i.imm(op2);
    i.build(*this);
}

#define X(NAME, OP)                                                            \
    void Builder::NAME##_reg(Reg dst, Reg op1, Reg op2)                        \
    {                                                                          \
        LOG;                                                                   \
        binary_reg(dst, op1, op2, Op::OP);                                     \
    }                                                                          \
    void Builder::NAME##_imm(Reg dst, Reg op1, uint16_t op2)                   \
    {                                                                          \
        LOG;                                                                   \
        binary_imm(dst, op1, op2, Op::OP);                                     \
    }

BINARY_INSTRUCTIONS

#undef X

void Builder::binary_reg(Reg dst, Reg op1, Reg op2, Op op)
{
    auto i = InsBuilder(op);
    i.dst_reg(dst);
    i.op1_reg(op1);
    i.op2_reg(op2);
    i.build(*this);
}

void Builder::binary_imm(Reg dst, Reg op1, uint16_t op2, Op op)
{
    auto i = InsBuilder(op);
    i.dst_reg(dst);
    i.op1_reg(op1);
    i.imm(op2);
    i.build(*this);
}

void Builder::call_reg(Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::Call);
    i.op1_reg(op1);
    i.build(*this);
}

void Builder::call_imm(uint16_t op1)
{
    LOG;
    auto i = InsBuilder(Op::Call);
    i.imm(op1);
    i.build(*this);
}

void Builder::ret()
{
    LOG;
    auto i = InsBuilder(Op::Ret);
    i.build(*this);
}

void Builder::reti()
{
    LOG;
    auto i = InsBuilder(Op::RetI);
    i.build(*this);
}

void Builder::lvcd_reg(Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::LVCD);
    i.op1_reg(op1);
    i.build(*this);
}

void Builder::lvcd_imm(uint16_t op1)
{
    LOG;
    auto i = InsBuilder(Op::LVCD);
    i.imm(op1);
    i.build(*this);
}

void Builder::lkbd_reg(Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::LKBD);
    i.op1_reg(op1);
    i.build(*this);
}

void Builder::lkbd_imm(uint16_t op1)
{
    LOG;
    auto i = InsBuilder(Op::LKBD);
    i.imm(op1);
    i.build(*this);
}

void Builder::dskr(Reg dst, Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::DSKR);
    i.dst_reg(dst);
    i.op1_reg(op1);
    i.build(*this);
}

void Builder::dskw(Reg dst, Reg op1)
{
    LOG;
    auto i = InsBuilder(Op::DSKW);
    i.dst_reg(dst);
    i.op1_reg(op1);
    i.build(*this);
}