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6502-cpp
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6502-cpp/src/6502-c++.cpp

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#include <cassert>
#include <cctype>
#include <charconv>
#include <ctre.hpp>
#include <fmt/format.h>
#include <fstream>
#include <iostream>
#include <map>
#include <regex>
#include <set>
#include <spdlog/spdlog.h>
#include <string>
#include <vector>
#include <CLI/CLI.hpp>
#include "include/6502.hpp"
#include "include/assembly.hpp"
#include "include/lib1funcs.hpp"
#include "include/optimizer.hpp"
#include "include/personalities/c64.hpp"
int to_int(const std::string_view sv)
{
int result{};
std::from_chars(sv.begin(), sv.end(), result);
return result;
}
int parse_8bit_literal(const std::string_view s) { return to_int(s.substr(1)); }
std::string_view strip_lo_hi(std::string_view s)
{
const auto matcher = ctre::match<R"(^(lo|hi)8\((.*)\)$)">;
if (const auto results = matcher(s); results) { return results.get<2>(); }
return s;
}
std::string_view strip_negate(std::string_view s)
{
const auto matcher = ctre::match<R"(^-\((.*)\)$)">;
if (const auto results = matcher(s); results) { return results.get<1>(); }
return s;
}
std::string_view strip_gs(std::string_view s)
{
const auto matcher = ctre::match<R"(gs\((.*)\))">;
if (const auto results = matcher(s); results) { return results.get<1>(); }
return s;
}
std::string_view strip_offset(std::string_view s)
{
const auto matcher = ctre::match<R"(^(.*)(\+|-)[0-9]+$)">;
if (const auto results = matcher(s); results) { return results.get<1>(); }
return s;
}
std::string fixup_8bit_literal(const std::string &s)
{
if (s[0] == '$') { return "#" + std::to_string(static_cast<uint8_t>(parse_8bit_literal(s))); }
if (s.starts_with("0x")) { return "#$" + s.substr(2); }
if (s.starts_with("lo8(")) { return fmt::format("#<({})", strip_gs(strip_lo_hi(s))); }
if (s.starts_with("hi8(")) { return fmt::format("#>({})", strip_gs(strip_lo_hi(s))); }
const auto is_num = std::all_of(begin(s), end(s), [](const auto c) { return (c >= '0' && c <= '9') || c == '-'; });
if (is_num) { return "#<" + s; }
return s;
}
struct AVR : ASMLine
{
enum class OpCode {
unknown,
adc,
adiw,
add,
andi,
breq,
brge,
brlt,
brlo,
brne,
brsh,
call,
clr,
com,
cp,
cpc,
cpi,
cpse,
dec,
eor,
in,
inc,
icall,
jmp,
ld,
ldd,
ldi,
lds,
lsl,
lsr,
mov,
nop,
OR,
out,
pop,
push,
rcall,
ret,
rjmp,
rol,
ror,
sbc,
sbci,
sbiw,
sbrc,
sbrs,
st,
std,
sts,
sub,
subi,
swap,
tst,
};
[[nodiscard]] static constexpr OpCode parse_opcode(Type t, std::string_view o)
{
switch (t) {
case Type::Label:
case Type::Directive: return OpCode::unknown;
case Type::Instruction: {
if (o == "ldi") { return OpCode::ldi; }
if (o == "sts") { return OpCode::sts; }
if (o == "ret") { return OpCode::ret; }
if (o == "mov") { return OpCode::mov; }
if (o == "lsl") { return OpCode::lsl; }
if (o == "rol") { return OpCode::rol; }
if (o == "ror") { return OpCode::ror; }
if (o == "rcall") { return OpCode::rcall; }
if (o == "icall") { return OpCode::icall; }
if (o == "call") { return OpCode::call; }
if (o == "ld") { return OpCode::ld; }
if (o == "sub") { return OpCode::sub; }
if (o == "subi") { return OpCode::subi; }
if (o == "sbc") { return OpCode::sbc; }
if (o == "sbci") { return OpCode::sbci; }
if (o == "st") { return OpCode::st; }
if (o == "std") { return OpCode::std; }
if (o == "ldd") { return OpCode::ldd; }
if (o == "lds") { return OpCode::lds; }
if (o == "lsr") { return OpCode::lsr; }
if (o == "andi") { return OpCode::andi; }
if (o == "eor") { return OpCode::eor; }
if (o == "sbrc") { return OpCode::sbrc; }
if (o == "rjmp") { return OpCode::rjmp; }
if (o == "sbrs") { return OpCode::sbrs; }
if (o == "brne") { return OpCode::brne; }
if (o == "dec") { return OpCode::dec; }
if (o == "adiw") { return OpCode::adiw; }
if (o == "sbiw") { return OpCode::sbiw; }
if (o == "push") { return OpCode::push; }
if (o == "pop") { return OpCode::pop; }
if (o == "com") { return OpCode::com; }
if (o == "swap") { return OpCode::swap; }
if (o == "clr") { return OpCode::clr; }
if (o == "cpse") { return OpCode::cpse; }
if (o == "cpi") { return OpCode::cpi; }
if (o == "brlo") { return OpCode::brlo; }
if (o == "add") { return OpCode::add; }
if (o == "adc") { return OpCode::adc; }
if (o == "cpc") { return OpCode::cpc; }
if (o == "cp") { return OpCode::cp; }
if (o == "brsh") { return OpCode::brsh; }
if (o == "breq") { return OpCode::breq; }
if (o == "in") { return OpCode::in; }
if (o == "out") { return OpCode::out; }
if (o == "inc") { return OpCode::inc; }
if (o == "nop") { return OpCode::nop; }
if (o == "jmp") { return OpCode::jmp; }
if (o == "tst") { return OpCode::tst; }
if (o == "brge") { return OpCode::brge; }
if (o == "brlt") { return OpCode::brlt; }
if (o == "or") { return OpCode::OR; }
}
}
throw std::runtime_error(fmt::format("Unknown opcode: {}", o));
}
static int get_register_number(const char reg_name)
{
if (reg_name == 'X') { return 26; }
if (reg_name == 'Y') { return 28; }
if (reg_name == 'Z') { return 30; }
throw std::runtime_error("Unknown register name");
}
static Operand parse_operand(std::string_view o)
{
if (o.empty()) { return Operand(); }
if (o[0] == 'r' && o.size() > 1) {
return Operand(Operand::Type::reg, to_int(o.substr(1)));
} else {
return Operand(Operand::Type::literal, std::string{ o });
}
}
AVR(const int t_line_num,
std::string_view t_line_text,
Type t,
std::string_view t_opcode,
std::string_view o1 = "",
std::string_view o2 = "")
: ASMLine(t, std::string(t_opcode)), line_num(t_line_num), line_text(std::string(t_line_text)),
opcode(parse_opcode(t, t_opcode)), operand1(parse_operand(o1)), operand2(parse_operand(o2))
{}
int line_num;
std::string line_text;
OpCode opcode;
Operand operand1;
Operand operand2;
};
void indirect_load(std::vector<mos6502> &instructions,
const std::string &from_address_low_byte,
const std::string &to_address,
const int offset = 0)
{
instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, fmt::format("#{}", offset)));
instructions.emplace_back(
mos6502::OpCode::lda, Operand(Operand::Type::literal, "(" + from_address_low_byte + "), Y"));
instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, to_address));
}
void indirect_store(std::vector<mos6502> &instructions,
const std::string &from_address,
const std::string &to_address_low_byte,
const int offset = 0)
{
instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, from_address));
instructions.emplace_back(mos6502::OpCode::ldy, Operand(Operand::Type::literal, fmt::format("#{}", offset)));
instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, "(" + to_address_low_byte + "), Y"));
}
// returns the "s_set","s_clear" labels to use for later
[[nodiscard]] std::pair<std::string, std::string> setup_S_flag(std::vector<mos6502> &instructions)
{
const auto location = instructions.size();
std::string n_set = fmt::format("n_set_{}", location);
std::string s_set = fmt::format("s_set_{}", location);
std::string s_clear = fmt::format("s_clear_{}", location);
instructions.emplace_back(mos6502::OpCode::bmi, Operand(Operand::Type::literal, n_set));
instructions.emplace_back(mos6502::OpCode::bvs, Operand(Operand::Type::literal, s_set));
instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, s_clear));
instructions.emplace_back(ASMLine::Type::Label, n_set);
instructions.emplace_back(mos6502::OpCode::bvs, Operand(Operand::Type::literal, s_clear));
instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, s_set));
return { s_set, s_clear };
}
void fixup_16_bit_N_Z_flags(std::vector<mos6502> &instructions)
{
// need to get both Z and N set appropriately
// assuming A contains higher order byte and X contains lower order byte
instructions.emplace_back(ASMLine::Type::Directive, "; BEGIN remove if next is lda");
instructions.emplace_back(ASMLine::Type::Directive, "; set CPU flags assuming A holds the higher order byte already");
std::string set_flag_label = "fixup_16_bit_op_flags" + std::to_string(instructions.size());
// if high order is negative, we know it's not 0 and it is negative
instructions.emplace_back(mos6502::OpCode::bmi, Operand(Operand::Type::literal, set_flag_label));
// if it's not 0, then branch down, we know the result is not 0 and not negative
instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, set_flag_label));
// if the higher order byte is 0, test the lower order byte, which was saved for us in X
instructions.emplace_back(mos6502::OpCode::txa);
// if low order is not negative, we know it's 0 or not 0
instructions.emplace_back(mos6502::OpCode::bpl, Operand(Operand::Type::literal, set_flag_label));
// if low order byte is negative, just load 1, this will properly set the Z flag and leave C correct
instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#1"));
instructions.emplace_back(ASMLine::Type::Label, set_flag_label);
instructions.emplace_back(ASMLine::Type::Directive, "; END remove if next is lda, bcc, bcs, ldy, inc, clc, sec");
}
void add_16_bit(const Personality &personality,
std::vector<mos6502> &instructions,
int reg,
const std::string_view value)
{
instructions.emplace_back(mos6502::OpCode::clc);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, fmt::format("#({})", value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::tax);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1));
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#0"));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
fixup_16_bit_N_Z_flags(instructions);
}
void add_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg, const std::uint16_t value)
{
instructions.emplace_back(mos6502::OpCode::clc);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg));
instructions.emplace_back(
mos6502::OpCode::adc, Operand(Operand::Type::literal, "#" + std::to_string((value & 0xFFu))));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::tax);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1));
instructions.emplace_back(
mos6502::OpCode::adc, Operand(Operand::Type::literal, "#" + std::to_string((value >> 8u) & 0xFFu)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
fixup_16_bit_N_Z_flags(instructions);
}
void subtract_16_bit(const Personality &personality,
std::vector<mos6502> &instructions,
int reg,
const std::string_view value)
{
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::sbc, Operand(Operand::Type::literal, fmt::format("#({})", value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::tax);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1));
instructions.emplace_back(mos6502::OpCode::sbc, Operand(Operand::Type::literal, "#0"));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
fixup_16_bit_N_Z_flags(instructions);
}
void subtract_16_bit(const Personality &personality,
std::vector<mos6502> &instructions,
int reg,
const std::uint16_t value)
{
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg));
instructions.emplace_back(
mos6502::OpCode::sbc, Operand(Operand::Type::literal, "#" + std::to_string((value & 0xFFu))));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::tax);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1));
instructions.emplace_back(
mos6502::OpCode::sbc, Operand(Operand::Type::literal, "#" + std::to_string((value >> 8u) & 0xFFu)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
fixup_16_bit_N_Z_flags(instructions);
}
void increment_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg)
{
std::string skip_high_byte_label = "skip_inc_high_byte_" + std::to_string(instructions.size()) + "__optimizable";
instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, skip_high_byte_label));
instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(reg + 1));
instructions.emplace_back(ASMLine::Type::Label, skip_high_byte_label);
}
void translate_instruction(const Personality &personality,
std::vector<mos6502> &instructions,
const AVR::OpCode op,
const Operand &o1,
const Operand &o2)
{
const auto translate_register_number = [](const Operand &reg) {
if (reg.value == "__zero_reg__") {
return 1;
} else if (reg.value == "__temp_reg__") {
return 0;
} else {
return reg.reg_num;
}
};
const auto o1_reg_num = translate_register_number(o1);
const auto o2_reg_num = translate_register_number(o2);
switch (op) {
case AVR::OpCode::OR: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::ORA, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::jmp: instructions.emplace_back(mos6502::OpCode::jmp, o1); return;
case AVR::OpCode::tst: {
// just an lda will set the relevant flags that the tst operation sets, so I think this is
// sufficient
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::dec: instructions.emplace_back(mos6502::OpCode::dec, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::ldi:
instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
case AVR::OpCode::sts:
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, Operand(o1.type, o1.value));
return;
case AVR::OpCode::ret: instructions.emplace_back(mos6502::OpCode::rts); return;
case AVR::OpCode::mov:
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
case AVR::OpCode::lsl: instructions.emplace_back(mos6502::OpCode::asl, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::rol: instructions.emplace_back(mos6502::OpCode::rol, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::ror: instructions.emplace_back(mos6502::OpCode::ror, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::call:
if (o1.value != ".") {
instructions.emplace_back(mos6502::OpCode::jsr, o1);
return;
}
throw std::runtime_error("Unhandled call");
case AVR::OpCode::icall: {
std::string new_label_name = "return_from_icall_" + std::to_string(instructions.size());
instructions.emplace_back(
mos6502::OpCode::lda, Operand(Operand::Type::literal, fmt::format("#>({}-1)", new_label_name)));
instructions.emplace_back(mos6502::OpCode::pha);
instructions.emplace_back(
mos6502::OpCode::lda, Operand(Operand::Type::literal, fmt::format("#<({}-1)", new_label_name)));
instructions.emplace_back(mos6502::OpCode::pha);
instructions.emplace_back(mos6502::OpCode::jmp,
Operand(Operand::Type::literal, "(" + personality.get_register(AVR::get_register_number('Z')).value + ")"));
instructions.emplace_back(ASMLine::Type::Label, new_label_name);
return;
}
case AVR::OpCode::rcall:
if (o1.value != ".") {
instructions.emplace_back(mos6502::OpCode::jsr, o1);
} else {
// just push in 2 bytes
instructions.emplace_back(mos6502::OpCode::pha);
instructions.emplace_back(mos6502::OpCode::pha);
}
return;
case AVR::OpCode::ld: {
if (o2.value == "Z" || o2.value == "X" || o2.value == "Y") {
indirect_load(instructions,
personality.get_register(AVR::get_register_number(o2.value[0])).value,
personality.get_register(o1_reg_num).value);
return;
}
if (o2.value == "Z+" || o2.value == "X+" || o2.value == "Y+") {
indirect_load(instructions,
personality.get_register(AVR::get_register_number(o2.value[0])).value,
personality.get_register(o1_reg_num).value);
increment_16_bit(personality, instructions, AVR::get_register_number(o2.value[0]));
return;
}
throw std::runtime_error("Unknown ld indexing");
}
case AVR::OpCode::ldd: {
if (o2.value[1] == '+') {
indirect_load(instructions,
personality.get_register(AVR::get_register_number(o2.value[0])).value,
personality.get_register(o1_reg_num).value,
to_int(o2.value.substr(2)));
return;
}
throw std::runtime_error("Unhandled 'ldd'");
}
case AVR::OpCode::std: {
if (o1.value[1] == '+') {
indirect_store(instructions,
personality.get_register(o2_reg_num).value,
personality.get_register(AVR::get_register_number(o1.value[0])).value,
to_int(o1.value.substr(2)));
return;
}
throw std::runtime_error("Unhandled 'std'");
}
case AVR::OpCode::brlt: {
const auto [s_set, s_clear] = setup_S_flag(instructions);
if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcc instead of bcs
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(ASMLine::Type::Label, s_set);
instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Label, s_clear);
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(ASMLine::Type::Label, s_set);
instructions.emplace_back(mos6502::OpCode::jmp, o1);
instructions.emplace_back(ASMLine::Type::Label, s_clear);
return;
}
}
case AVR::OpCode::brge: {
const auto [s_set, s_clear] = setup_S_flag(instructions);
if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcc instead of bcs
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(ASMLine::Type::Label, s_clear);
instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Label, s_set);
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(ASMLine::Type::Label, s_clear);
instructions.emplace_back(mos6502::OpCode::jmp, o1);
instructions.emplace_back(ASMLine::Type::Label, s_set);
return;
}
return;
}
case AVR::OpCode::sub: {
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::tax);
// fixup_16_bit_N_Z_flags(instructions);
return;
}
case AVR::OpCode::sbc: {
// we want to utilize the carry flag, however it was set previously
// (it's really a borrow flag on the 6502)
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
fixup_16_bit_N_Z_flags(instructions);
return;
}
case AVR::OpCode::sbci: {
// we want to utilize the carry flag, however it was set previously
// (it's really a borrow flag on the 6502)
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sbc, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
fixup_16_bit_N_Z_flags(instructions);
return;
}
case AVR::OpCode::inc: instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::subi: {
// to do: deal with Carry bit (and other flags) nonsense from AVR
// if |x| < |y| -> x-y +carry
// for these special cases with -(1) and -(-(1))
if (o2.value == "lo8(-(-1))") {
instructions.emplace_back(mos6502::OpCode::dec, personality.get_register(o1_reg_num));
return;
}
if (o2.value == "lo8(-(1))") {
instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(o1_reg_num));
return;
}
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
// have to set carry flag, since it gets inverted by sbc
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::sbc, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
// temporarily store lower order (not carried substraction) byte into Y for checking
// later if this is a two byte subtraction operation
instructions.emplace_back(mos6502::OpCode::tax);
return;
}
case AVR::OpCode::st: {
if (o1.value == "Z" || o1.value == "Y" || o1.value == "X") {
indirect_store(instructions,
personality.get_register(o2_reg_num).value,
personality.get_register(AVR::get_register_number(o1.value[0])).value);
return;
}
if (o1.value == "Z+" || o1.value == "Y+" || o1.value == "X+") {
indirect_store(instructions,
personality.get_register(o2_reg_num).value,
personality.get_register(AVR::get_register_number(o1.value[0])).value);
increment_16_bit(personality, instructions, AVR::get_register_number(o1.value[0]));
return;
}
throw std::runtime_error("Unhandled st");
}
case AVR::OpCode::lds: {
instructions.emplace_back(mos6502::OpCode::lda, o2);
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::lsr: {
instructions.emplace_back(mos6502::OpCode::lsr, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::andi: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::AND, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::eor: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::eor, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::cpse: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::cmp, personality.get_register(o2_reg_num));
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::beq, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
}
case AVR::OpCode::sbrc: {
instructions.emplace_back(
mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (to_int(o2.value))))));
instructions.emplace_back(mos6502::OpCode::bit, personality.get_register(o1_reg_num));
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::beq, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
}
case AVR::OpCode::sbrs: {
instructions.emplace_back(mos6502::OpCode::lda,
Operand(o2.type, fixup_8bit_literal("$" + std::to_string(1 << (to_int(o2.value.c_str()))))));
instructions.emplace_back(mos6502::OpCode::bit, personality.get_register(o1_reg_num));
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
}
case AVR::OpCode::brne: {
if (o1.value == "0b") {
instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, "memcpy_0"));
return;
} else if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcc instead of bcs
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(mos6502::OpCode::bne, o1);
return;
}
throw std::runtime_error("Unhanled brne format");
}
case AVR::OpCode::rjmp: {
instructions.emplace_back(mos6502::OpCode::jmp, o1);
return;
}
case AVR::OpCode::sbiw: {
subtract_16_bit(personality, instructions, o1_reg_num, o2.value);
return;
}
case AVR::OpCode::adiw: {
add_16_bit(personality, instructions, o1_reg_num, o2.value);
return;
}
case AVR::OpCode::push: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::pha);
return;
}
case AVR::OpCode::pop: {
instructions.emplace_back(mos6502::OpCode::pla);
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::com: {
// We're doing this in the same way the AVR does it, to make sure the C flag is set properly, it expects C to be set
instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$FF"));
instructions.emplace_back(mos6502::OpCode::eor, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::clr: {
instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$00"));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::cpi: {
// note that this will leave the C flag in the 6502 borrow state, not normal carry state
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::sbc, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::tax);
return;
}
case AVR::OpCode::brlo: {
if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcc instead of bcs
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::bcc, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(mos6502::OpCode::bcc, o1);
return;
}
}
case AVR::OpCode::swap: {
// from http://www.6502.org/source/general/SWN.html
// ASL A
// ADC #$80
// ROL A
// ASL A
// ADC #$80
// ROL A
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::asl);
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#$80"));
instructions.emplace_back(mos6502::OpCode::rol);
instructions.emplace_back(mos6502::OpCode::asl);
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#$80"));
instructions.emplace_back(mos6502::OpCode::rol);
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::add: {
instructions.emplace_back(mos6502::OpCode::clc);
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::adc, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::adc: {
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::adc, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::cp: {
// note that this will leave the C flag in the 6502 borrow state, not normal carry state
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::tax);
return;
}
case AVR::OpCode::cpc: {
// this instruction seems to need to be used in the case after a sbc operation, where the
// carry flag is set to the appropriate borrow state, so I'm going to not invert
// the carry flag here, and assume that it's set how the 6502 wants it to be
// set from the previous operation
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sbc, personality.get_register(o2_reg_num));
fixup_16_bit_N_Z_flags(instructions);
return;
}
case AVR::OpCode::brsh: {
if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcs instead of bcc
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::bcs, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(mos6502::OpCode::bcs, o1);
return;
}
}
case AVR::OpCode::out: {
if (o1.value == "__SP_L__") {
instructions.emplace_back(mos6502::OpCode::ldx, personality.get_register(o2_reg_num));
instructions.emplace_back(mos6502::OpCode::txs);
return;
}
if (o1.value == "__SP_H__") {
// officially nothing to do - we cannot change the high byte of the SP on 6502
return;
}
throw std::runtime_error("Could not translate unknown 'out' instruction");
}
case AVR::OpCode::in: {
if (o2.value == "__SP_L__") {
instructions.emplace_back(mos6502::OpCode::tsx);
instructions.emplace_back(mos6502::OpCode::stx, personality.get_register(o1_reg_num));
return;
}
if (o2.value == "__SP_H__") {
instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$01"));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(o1_reg_num));
return;
}
throw std::runtime_error("Could not translate unknown 'in' instruction");
}
case AVR::OpCode::breq: {
if (o1.value == ".+2") {
// assumes 6502 'borrow' for Carry flag instead of carry, so bcc instead of bcs
std::string new_label_name = "skip_next_instruction_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::beq, Operand(Operand::Type::literal, new_label_name));
instructions.emplace_back(ASMLine::Type::Directive, new_label_name);
return;
} else {
instructions.emplace_back(mos6502::OpCode::beq, o1);
return;
}
}
case AVR::OpCode::nop: {
instructions.emplace_back(mos6502::OpCode::nop);
return;
}
case AVR::OpCode::unknown: {
throw std::runtime_error("Could not translate 'unknown' instruction");
}
}
throw std::runtime_error("Could not translate unhandled instruction");
}
void to_mos6502(const Personality &personality, const AVR &from_instruction, std::vector<mos6502> &instructions)
{
try {
switch (from_instruction.type) {
case ASMLine::Type::Label:
if (from_instruction.text == "0") {
instructions.emplace_back(from_instruction.type, "-memcpy_0");
} else {
instructions.emplace_back(from_instruction.type, from_instruction.text);
}
return;
case ASMLine::Type::Directive:
if (from_instruction.text.starts_with(".string")) {
instructions.emplace_back(ASMLine::Type::Directive, ".asc " + from_instruction.text.substr(7));
} else if (from_instruction.text.starts_with(".word")) {
const auto matcher = ctre::match<R"(\s*.word\s*(.*))">;
if (const auto results = matcher(from_instruction.text); results) {
const auto matched_gs = results.get<1>().to_string();
instructions.emplace_back(ASMLine::Type::Directive, ".word " + std::string{ strip_gs(matched_gs) });
} else {
instructions.emplace_back(ASMLine::Type::Directive, ".word " + from_instruction.text.substr(6));
// spdlog::warn("Unknown .word directive '{}'", from_instruction.text);
}
} else if (from_instruction.text.starts_with(".byte")) {
instructions.emplace_back(ASMLine::Type::Directive, ".byt <" + from_instruction.text.substr(6));
} else if (from_instruction.text.starts_with(".zero")) {
const auto count = std::stoull(&*std::next(from_instruction.text.begin(), 6), nullptr, 10);
std::string zeros;
for (std::size_t i = 0; i < count; ++i) {
if ((i % 40) == 0) {
if (!zeros.empty()) {
instructions.emplace_back(ASMLine::Type::Directive, zeros);
zeros.clear();
}
zeros += ".byt 0";
} else {
zeros += ",0";
}
}
if (!zeros.empty()) { instructions.emplace_back(ASMLine::Type::Directive, zeros); }
} else if (from_instruction.text[0] == ';') {
// it's a comment
instructions.emplace_back(ASMLine::Type::Directive, from_instruction.text);
} else {
instructions.emplace_back(ASMLine::Type::Directive, "; Unknown directive: " + from_instruction.text);
}
return;
case ASMLine::Type::Instruction:
const auto head = instructions.size();
try {
translate_instruction(
personality, instructions, from_instruction.opcode, from_instruction.operand1, from_instruction.operand2);
} catch (const std::exception &e) {
instructions.emplace_back(
ASMLine::Type::Directive, "; Unhandled opcode: '" + from_instruction.text + "' " + e.what());
spdlog::error(
"[{}]: Unhandled instruction: '{}': {}", from_instruction.line_num, from_instruction.line_text, e.what());
}
auto text = from_instruction.line_text;
if (text[0] == '\t') { text.erase(0, 1); }
for_each(std::next(instructions.begin(), static_cast<std::ptrdiff_t>(head)),
instructions.end(),
[text](auto &ins) { ins.comment = text; });
return;
}
} catch (const std::exception &e) {
spdlog::error(
"[{}]: Unhandled instruction: '{}': {}", from_instruction.line_num, from_instruction.line_text, e.what());
}
}
bool fix_long_branches(std::vector<mos6502> &instructions, int &branch_patch_count)
{
std::map<std::string, size_t> labels;
for (size_t op = 0; op < instructions.size(); ++op) {
if (instructions[op].type == ASMLine::Type::Label) { labels[instructions[op].text] = op; }
}
for (size_t op = 0; op < instructions.size(); ++op) {
if (instructions[op].is_branch
&& std::abs(static_cast<int>(labels[instructions[op].op.value]) - static_cast<int>(op)) * 4 > 255) {
++branch_patch_count;
const auto going_to = instructions[op].op.value;
const auto new_pos = "patch_" + std::to_string(branch_patch_count);
// uh-oh too long of a branch, have to convert this to a jump...
std::map<mos6502::OpCode, mos6502::OpCode> branch_mapping;
branch_mapping[mos6502::OpCode::bne] = mos6502::OpCode::beq;
branch_mapping[mos6502::OpCode::beq] = mos6502::OpCode::bne;
branch_mapping[mos6502::OpCode::bcc] = mos6502::OpCode::bcs;
branch_mapping[mos6502::OpCode::bcs] = mos6502::OpCode::bcc;
const auto mapping = branch_mapping.find(instructions[op].opcode);
if (mapping != branch_mapping.end()) {
const auto comment = instructions[op].comment;
instructions[op] = mos6502(mapping->second, Operand(Operand::Type::literal, new_pos));
instructions.insert(std::next(std::begin(instructions), static_cast<std::ptrdiff_t>(op + 1)),
mos6502(mos6502::OpCode::jmp, Operand(Operand::Type::literal, going_to)));
instructions.insert(std::next(std::begin(instructions), static_cast<std::ptrdiff_t>(op + 2)),
mos6502(ASMLine::Type::Label, new_pos));
instructions[op].comment = instructions[op + 1].comment = instructions[op + 2].comment = comment;
return true;
}
throw std::runtime_error("Don't know how to reorg this branch: " + instructions[op].to_string());
}
}
return false;
}
std::vector<mos6502> run(const Personality &personality, std::istream &input, const bool do_optimize)
{
std::regex Comment(R"(\s*(\#|;)(.*))");
std::regex Label(R"(^\s*(\S+):.*)");
std::regex Directive(R"(^\s*(\..+))");
std::regex UnaryInstruction(R"(^\s+(\S+)\s+(\S+).*)");
std::regex BinaryInstruction(R"(^\s+(\S+)\s+(\S+),\s*(\S+).*)");
std::regex Instruction(R"(^\s+(\S+).*)");
std::size_t lineno = 0;
std::vector<AVR> instructions;
const auto parse_line = [&](const auto &line) {
try {
std::smatch match;
if (std::regex_match(line, match, Label)) {
instructions.emplace_back(lineno, line, ASMLine::Type::Label, match[1].str());
} else if (std::regex_match(line, match, Comment)) {
// save comments!
instructions.emplace_back(lineno, line, ASMLine::Type::Directive, "; " + match[2].str());
} else if (std::regex_match(line, match, Directive)) {
instructions.emplace_back(lineno, line, ASMLine::Type::Directive, match[1].str());
} else if (std::regex_match(line, match, BinaryInstruction)) {
instructions.emplace_back(
lineno, line, ASMLine::Type::Instruction, match[1].str(), match[2].str(), match[3].str());
} else if (std::regex_match(line, match, UnaryInstruction)) {
instructions.emplace_back(lineno, line, ASMLine::Type::Instruction, match[1].str(), match[2].str());
} else if (std::regex_match(line, match, Instruction)) {
instructions.emplace_back(lineno, line, ASMLine::Type::Instruction, match[1].str());
} else if (line.empty()) {
// skip empty lines
}
} catch (const std::exception &e) {
spdlog::error("[{}]: parse exception with '{}': {}", lineno, line, e.what());
}
++lineno;
};
const auto parse_stream = [&](auto &stream) {
while (stream.good()) {
std::string line;
getline(stream, line);
parse_line(line);
}
};
const auto parse_string = [&](const auto &string) {
std::stringstream ss{ std::string(string) };
parse_stream(ss);
};
parse_stream(input);
const bool needs_mulhi3 = std::any_of(begin(instructions), end(instructions), [](const AVR &instruction) {
return instruction.line_text.find("__mulhi3") != std::string::npos;
});
const bool needs_mulqi3 = std::any_of(begin(instructions), end(instructions), [](const AVR &instruction) {
return instruction.line_text.find("__mulqi3") != std::string::npos;
});
if (needs_mulhi3) { parse_string(__mulhi3); }
if (needs_mulqi3) { parse_string(__mulqi3); }
std::set<std::string> labels;
for (const auto &i : instructions) {
if (i.type == ASMLine::Type::Label) { labels.insert(i.text); }
}
std::set<std::string> used_labels{ "main" };
for (const auto &i : instructions) {
const auto check_label = [&](const std::string &value) {
if (labels.count(value) != 0) { used_labels.insert(value); }
};
if (i.type == ASMLine::Type::Instruction) {
check_label(i.operand1.value);
check_label(i.operand2.value);
check_label(std::string{ strip_gs(strip_offset(strip_negate(strip_lo_hi(i.operand1.value)))) });
check_label(std::string{ strip_gs(strip_offset(strip_negate(strip_lo_hi(i.operand2.value)))) });
} else if (i.type == ASMLine::Type::Directive) {
const auto matcher = ctre::match<R"(\s*.word\s*(.*))">;
if (const auto results = matcher(i.text); results) {
const auto matched_gs = results.get<1>().to_string();
spdlog::trace("matched .word: '{}' from '{}'", matched_gs, i.text);
check_label(std::string{ strip_gs(matched_gs) });
}
}
}
const auto new_labels = [&used_labels]() {
std::map<std::string, std::string> result;
for (const auto &l : used_labels) {
const auto new_label = [](auto label) -> std::string {
if (label[0] == '.') { label.erase(0, 1); }
for (auto &c : label) {
if (c == '.') { c = '_'; }
}
return label;
};
result.emplace(std::make_pair(l, new_label(l)));
}
return result;
}();
for (const auto &label : new_labels) { spdlog::trace("used label: '{}':'{}'", label.first, label.second); }
for (auto &i : instructions) {
if (i.type == ASMLine::Type::Label) {
if (i.text == "0") {
i.text = "-memcpy_0";
} else {
try {
i.text = new_labels.at(i.text);
} catch (...) {
spdlog::warn("Unused label: '{}', consider making function static until we remove unused functions", i.text);
i.text = "; Label is unused: " + i.text;
}
}
}
if (i.type == ASMLine::Type::Directive) {
const auto matcher = ctre::match<R"(\s*.word\s*(.*))">;
if (const auto results = matcher(i.text); results) {
const auto matched_gs = results.get<1>().to_string();
const auto possible_label = std::string{ strip_gs(matched_gs) };
const auto matched_label = new_labels.find(possible_label);
if (matched_label != new_labels.end()) { i.text = ".word " + matched_label->second; }
}
}
if (i.operand2.value.starts_with("lo8(") || i.operand2.value.starts_with("hi8(")) {
const auto lo_hi_operand = strip_lo_hi(i.operand2.value);
const auto label_matcher = ctre::match<R"(([A-Za-z0-9.]+).*)">;
if (const auto results = label_matcher(lo_hi_operand); results) {
std::string_view potential_label = results.get<1>();
const auto itr1 = new_labels.find(std::string{ potential_label });
if (itr1 != new_labels.end()) { i.operand2.value.replace(4, potential_label.size(), itr1->second); }
}
}
const auto itr1 = new_labels.find(i.operand1.value);
if (itr1 != new_labels.end()) { i.operand1.value = itr1->second; }
const auto itr2 = new_labels.find(i.operand2.value);
if (itr2 != new_labels.end()) { i.operand2.value = itr2->second; }
}
std::vector<mos6502> new_instructions;
personality.insert_autostart_sequence(new_instructions);
// set __zero_reg__ (reg 1 on AVR) to 0
new_instructions.emplace_back(mos6502::OpCode::lda, Operand(Operand::Type::literal, "#$00"));
new_instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(1));
new_instructions.emplace_back(mos6502::OpCode::jmp, Operand(Operand::Type::literal, "main"));
int instructions_to_skip = -1;
std::string next_label_name;
for (const auto &i : instructions) {
to_mos6502(personality, i, new_instructions);
// intentionally copy so we don't invalidate the reference
const auto last_instruction = new_instructions.back();
if (i.type == ASMLine::Type::Instruction) { --instructions_to_skip; }
if (instructions_to_skip == 0) {
new_instructions.emplace_back(ASMLine::Type::Label, next_label_name);
// todo: I kind of hate this -1 as a marker
instructions_to_skip = -1;
}
if (last_instruction.type == ASMLine::Type::Directive
&& last_instruction.text.starts_with("skip_next_instruction")) {
instructions_to_skip = 1;
next_label_name = last_instruction.text;
new_instructions.pop_back();
}
if (last_instruction.type == ASMLine::Type::Directive
&& last_instruction.text.starts_with("skip_next_2_instructions")) {
instructions_to_skip = 2;
next_label_name = last_instruction.text;
new_instructions.pop_back();
}
}
if (do_optimize) {
spdlog::info("Running optimization passes");
int count = 0;
while (optimize(new_instructions, personality)) {
// do it however many times it takes
++count;
}
spdlog::info("Optimization passes run: {}", count);
} else {
spdlog::info("Optimization passes disabled");
}
int branch_patch_count = 0;
while (fix_long_branches(new_instructions, branch_patch_count)) {
// do it however many times it takes
}
return new_instructions;
}
enum struct Target { C64 };
int main(const int argc, const char **argv)
{
spdlog::set_level(spdlog::level::trace);
const std::map<std::string, Target> targets{ { "C64", Target::C64 } };
CLI::App app{ "C++ Compiler for 6502 processors" };
std::filesystem::path filename{};
Target target{ Target::C64 };
bool optimize{ true };
app.add_option("-f,--file", filename, "C++ file to compile")->required(true);
app.add_option("-t,--target", target, "6502 - based system to target")
->required(true)
->transform(CLI::CheckedTransformer(targets, CLI::ignore_case));
std::string optimization_level;
app.add_option("-O", optimization_level, "Optimization level to pass to GCC instance")
->required(true)
->check(CLI::IsMember({ "s", "0", "1", "2", "3" }));
app.add_flag("--optimize", optimize, "Enable optimization of 6502 generated assembly")->default_val(true);
CLI11_PARSE(app, argc, argv)
const std::string_view include_directories = "-I ~/avr-libstdcpp/include/";
const std::string_view warning_flags = "-Wall -Wextra";
const std::string_view avr = "avr3";
const auto make_output_file_name = [](auto input_filename, const auto &new_extension) {
input_filename.replace_extension(new_extension);
return std::filesystem::current_path() / input_filename.filename();
};
const auto avr_output_file = make_output_file_name(filename, "avr.asm");
const auto mos6502_output_file = make_output_file_name(filename, "6502.asm");
const auto program_output_file = make_output_file_name(filename, "prg");
std::string disabled_optimizations;
/*
disabled_optimizations += " -fno-gcse-after-reload";
disabled_optimizations += " -fno-ipa-cp-clone";
disabled_optimizations += " -fno-loop-interchange";
disabled_optimizations += " -fno-loop-unroll-and-jam";
disabled_optimizations += " -fno-peel-loops";
disabled_optimizations += " -fno-predictive-commoning";
disabled_optimizations += " -fno-split-loops";
disabled_optimizations += " -fno-split-paths";
disabled_optimizations += " -fno-tree-loop-distribution";
disabled_optimizations += " -fno-tree-loop-vectorize";
disabled_optimizations += " -fno-tree-partial-pre";
disabled_optimizations += " -fno-tree-slp-vectorize";
disabled_optimizations += " -fno-unswitch-loops";
disabled_optimizations += " -fvect-cost-model=cheap";
disabled_optimizations += " -fno-version-loops-for-strides";
*/
const std::string gcc_command = fmt::format(
"avr-gcc -fverbose-asm -c -o {outfile} -S {warning_flags} -std=c++20 -mtiny-stack "
"-mmcu={avr} -O{optimization} {disabled_optimizations} {include_dirs} {infile}",
fmt::arg("outfile", avr_output_file.generic_string()),
fmt::arg("warning_flags", warning_flags),
fmt::arg("avr", avr),
fmt::arg("optimization", optimization_level),
fmt::arg("include_dirs", include_directories),
fmt::arg("disabled_optimizations", disabled_optimizations),
fmt::arg("infile", filename.generic_string()));
spdlog::info("Executing gcc: `{}`", gcc_command);
const auto result = std::system(gcc_command.c_str());
if (result != EXIT_SUCCESS) {
spdlog::critical("compile failed");
return result;
}
std::ifstream input(avr_output_file);
C64 personality;
const auto new_instructions = run(personality, input, optimize);
{
// make sure file is closed before we try to re-open it with xa
std::ofstream mos6502_output(mos6502_output_file, std::ofstream::trunc);
for (const auto &i : new_instructions) { mos6502_output << i.to_string() << '\n'; }
}
const std::string xa_command = fmt::format("xa -O PETSCREEN -M -o {outfile} {infile}",
fmt::arg("infile", mos6502_output_file.generic_string()),
fmt::arg("outfile", program_output_file.generic_string()));
spdlog::info("Executing xa: `{}`", xa_command);
const auto xa_result = std::system(xa_command.c_str());
if (xa_result != EXIT_SUCCESS) {
spdlog::critical("assembly failed");
return result;
}
}
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