106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
#include "machine.h"
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#include "../opcode/opcode-handler-directory.h"
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#include <stdexcept>
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namespace emu_6502 {
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class MachineImpl {
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private:
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uint16_t code_loaded_at;
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uint16_t code_size;
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unique_ptr<Cpu> cpu;
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unique_ptr<Memory> memory;
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unique_ptr<Stack> stack;
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unique_ptr<OpcodeHandlerDirectory> opcode_handler_dir;
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public:
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MachineImpl() {
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cpu = make_unique<Cpu>();
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memory = make_unique<Memory>();
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stack = make_unique<Stack>(*memory, cpu->get_sp());
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opcode_handler_dir = make_unique<OpcodeHandlerDirectory>();
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}
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MachineImpl(const MachineImpl&) = delete;
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MachineImpl& operator=(const MachineImpl&) = delete;
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Cpu& get_cpu() {
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return *cpu;
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}
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Memory& get_memory() {
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return *memory;
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}
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Stack& get_stack() {
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return *stack;
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}
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void load(const vector<uint8_t>& program, uint16_t load_at) {
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code_loaded_at = load_at;
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code_size = program.size();
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uint32_t code_end = load_at + code_size;
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if (code_end > 0xFE00) // need space for graphics, interupts, etc.
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throw runtime_error("Program does not fit into memory");
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for (auto i = 0; i < program.size(); i++)
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memory->set_at(load_at + i, program.at(i));
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cpu->get_pc().set_value(load_at);
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}
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bool is_eop() {
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return cpu->get_pc().get_value() >= code_loaded_at + code_size;
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}
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uint8_t read_program_byte() {
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if (is_eop())
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throw runtime_error("Passed end of program");
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auto byte = memory->get_at(cpu->get_pc().get_value());
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cpu->get_pc().inc();
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return byte;
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}
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void execute(Machine& machine) {
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while (!is_eop()) {
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auto byte = read_program_byte();
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opcode_handler_dir->execute(byte, machine);
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}
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}
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};
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Machine::Machine() : pimpl(make_unique<MachineImpl>()) {
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}
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Machine::~Machine() = default;
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Cpu& Machine::get_cpu() {
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return pimpl->get_cpu();
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}
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Memory& Machine::get_memory() {
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return pimpl->get_memory();
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}
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Stack& Machine::get_stack() {
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return pimpl->get_stack();
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}
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void Machine::load(const vector<uint8_t>& program, uint16_t load_at) {
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pimpl->load(program, load_at);
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}
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bool Machine::is_eop() const {
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return pimpl->is_eop();
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}
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uint8_t Machine::read_program_byte() {
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return pimpl->read_program_byte();
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}
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void Machine::execute() {
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pimpl->execute(*this);
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}
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} |