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Some code organization and splitting up
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Jason Turner
240
include/6502.hpp
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240
include/6502.hpp
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#ifndef INC_6502_CPP_6502_HPP
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#define INC_6502_CPP_6502_HPP
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#include "assembly.hpp"
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struct mos6502 : ASMLine
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{
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enum class OpCode {
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unknown,
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adc,
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AND,
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asl,
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bcc,
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bcs,
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beq,
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bit,
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bmi,
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bne,
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bpl,
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cpy,
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cmp,
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clc,
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dec,
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eor,
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inc,
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jmp,
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jsr,
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lda,
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ldy,
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lsr,
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ORA,
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pha,
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php,
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pla,
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plp,
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rol,
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ror,
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rts,
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sbc,
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sec,
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sta,
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sty,
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tax,
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tay,
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txa,
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tya,
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};
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static bool get_is_branch(const OpCode o)
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{
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switch (o) {
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case OpCode::beq:
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case OpCode::bne:
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case OpCode::bmi:
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case OpCode::bpl:
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case OpCode::bcc:
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case OpCode::bcs:
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return true;
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case OpCode::adc:
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case OpCode::AND:
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case OpCode::asl:
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case OpCode::bit:
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case OpCode::cpy:
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case OpCode::cmp:
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case OpCode::clc:
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case OpCode::dec:
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case OpCode::eor:
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case OpCode::inc:
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case OpCode::jmp:
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case OpCode::jsr:
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case OpCode::lda:
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case OpCode::ldy:
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case OpCode::lsr:
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case OpCode::ORA:
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case OpCode::pha:
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case OpCode::php:
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case OpCode::pla:
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case OpCode::plp:
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case OpCode::rol:
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case OpCode::ror:
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case OpCode::rts:
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case OpCode::sbc:
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case OpCode::sec:
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case OpCode::sta:
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case OpCode::sty:
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case OpCode::tax:
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case OpCode::tay:
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case OpCode::txa:
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case OpCode::tya:
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case OpCode::unknown:
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break;
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}
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return false;
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}
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static bool get_is_comparison(const OpCode o)
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{
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switch (o) {
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case OpCode::bit:
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case OpCode::cmp:
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case OpCode::cpy:
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return true;
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case OpCode::adc:
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case OpCode::AND:
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case OpCode::asl:
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case OpCode::beq:
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case OpCode::bne:
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case OpCode::bmi:
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case OpCode::bpl:
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case OpCode::bcc:
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case OpCode::bcs:
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case OpCode::clc:
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case OpCode::dec:
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case OpCode::eor:
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case OpCode::inc:
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case OpCode::jmp:
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case OpCode::jsr:
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case OpCode::lda:
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case OpCode::ldy:
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case OpCode::lsr:
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case OpCode::ORA:
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case OpCode::pha:
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case OpCode::php:
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case OpCode::pla:
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case OpCode::plp:
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case OpCode::rol:
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case OpCode::ror:
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case OpCode::rts:
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case OpCode::sbc:
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case OpCode::sec:
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case OpCode::sta:
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case OpCode::sty:
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case OpCode::tax:
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case OpCode::tay:
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case OpCode::txa:
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case OpCode::tya:
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case OpCode::unknown:
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break;
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}
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return false;
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}
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explicit mos6502(const OpCode o)
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: ASMLine(Type::Instruction, std::string{ to_string(o) }), opcode(o), is_branch(get_is_branch(o)), is_comparison(get_is_comparison(o))
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{
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}
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mos6502(const Type t, std::string s)
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: ASMLine(t, std::move(s))
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{
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}
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mos6502(const OpCode o, Operand t_o)
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: ASMLine(Type::Instruction, std::string{ to_string(o) }), opcode(o), op(std::move(t_o)), is_branch(get_is_branch(o)), is_comparison(get_is_comparison(o))
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{
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}
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constexpr static std::string_view to_string(const OpCode o)
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{
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switch (o) {
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case OpCode::lda: return "lda";
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case OpCode::asl: return "asl";
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case OpCode::rol: return "rol";
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case OpCode::ldy: return "ldy";
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case OpCode::tay: return "tay";
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case OpCode::tya: return "tya";
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case OpCode::tax: return "tax";
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case OpCode::txa: return "txa";
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case OpCode::cpy: return "cpy";
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case OpCode::eor: return "eor";
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case OpCode::sta: return "sta";
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case OpCode::sty: return "sty";
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case OpCode::pha: return "pha";
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case OpCode::pla: return "pla";
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case OpCode::php: return "php";
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case OpCode::plp: return "plp";
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case OpCode::lsr: return "lsr";
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case OpCode::ror: return "ror";
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case OpCode::AND: return "and";
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case OpCode::inc: return "inc";
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case OpCode::dec: return "dec";
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case OpCode::ORA: return "ora";
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case OpCode::cmp: return "cmp";
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case OpCode::bne: return "bne";
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case OpCode::bmi: return "bmi";
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case OpCode::beq: return "beq";
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case OpCode::jmp: return "jmp";
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case OpCode::adc: return "adc";
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case OpCode::sbc: return "sbc";
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case OpCode::rts: return "rts";
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case OpCode::clc: return "clc";
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case OpCode::sec: return "sec";
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case OpCode::bit: return "bit";
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case OpCode::jsr: return "jsr";
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case OpCode::bpl: return "bpl";
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case OpCode::bcc: return "bcc";
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case OpCode::bcs: return "bcs";
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case OpCode::unknown: return "";
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}
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return "";
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}
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[[nodiscard]] std::string to_string() const
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{
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switch (type) {
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case ASMLine::Type::Label:
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return text;// + ':';
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case ASMLine::Type::Directive:
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case ASMLine::Type::Instruction: {
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return fmt::format("\t{} {:15}; {}", text, op.value, comment);
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}
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}
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throw std::runtime_error("Unable to render: " + text);
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}
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OpCode opcode = OpCode::unknown;
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Operand op;
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std::string comment;
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bool is_branch = false;
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bool is_comparison = false;
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};
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#endif//INC_6502_CPP_6502_HPP
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