nesemu/debugger/program_view.c

//
// Created by william on 10/01/24.
//

#include <stdlib.h>
#include "program_view.h"
#include "../cpu/op.h"

void decode_operands(DebugOperand *operands, const byte *ram, address start_addr) {
    int pc = start_addr;
    for (int i = 0; i < 10; i++) {
        DebugOperand operand;
        byte op_code = ram[pc];

        operand.addr = pc;
        operand.op_code = op_code;
        operand.addr_mode = get_op_addr_mode(op_code);

        pc += 1;

        if (operand.addr_mode == ADDR_MODE_ACCUMULATOR || operand.addr_mode == ADDR_MODE_IMPLICIT) {
            operand.type = OPERAND_TYPE_ACCUMULATOR;
            operand.value = 0;
        } else if (operand.addr_mode == ADDR_MODE_IMMEDIATE) {
            operand.type = OPERAND_TYPE_IMMEDIATE;
            operand.value = ram[pc];
            pc += 1;
        } else if (operand.addr_mode == ADDR_MODE_RELATIVE) {
            operand.type = OPERAND_TYPE_ADDRESS;
            operand.value = ram[pc];
            pc += 1;
        } else {
            operand.type = OPERAND_TYPE_ADDRESS;
            operand.value = ram[pc];
            operand.value += ram[pc + 1] << 8;
            pc += 2;
        }

        operands[i] = operand;
    }
}

char *get_addr_mode_format_str(AddressingMode addr_mode) {
    switch (addr_mode) {
        case ADDR_MODE_ABSOLUTE:
            return "$%04x";
        case ADDR_MODE_ABSOLUTE_INDEXED_X:
            return "$%04x,x";
        case ADDR_MODE_ABSOLUTE_INDEXED_Y:
            return "$%04x,y";
        case ADDR_MODE_ACCUMULATOR:
            return "A";
        case ADDR_MODE_IMMEDIATE:
            return "#$%02x";
        case ADDR_MODE_IMPLICIT:
            return "";
        case ADDR_MODE_INDIRECT_X:
            return "($%04x,x)";
        case ADDR_MODE_INDIRECT_JUMP:
            return "($%04x)";
        case ADDR_MODE_INDIRECT_Y:
            return "($%04x),y";
        case ADDR_MODE_RELATIVE:
            return "$%04x";
        case ADDR_MODE_ZERO_PAGE:
            return "$%02x,y";
        case ADDR_MODE_ZERO_PAGE_INDEXED_X:
            return "$%02x,x";
        case ADDR_MODE_ZERO_PAGE_INDEXED_Y:
            return "$%02x,y";
    }
}

void program_view_write_line(ProgramView *view, int line, DebugOperand *operand) {
    char *op_name = get_op_code_name(operand->op_code);

    window_inter_print(view->window, 0, line, "%04x:", operand->addr);
    window_inter_print(view->window, 6, line, "%s", op_name);

    char *format = get_addr_mode_format_str(operand->addr_mode);
    window_inter_print(view->window, 10, line, format, operand->value);
}

void program_view_print(ProgramView *view, DebugOperand *operands) {
    for (int line = 0; line < 10; line++) {
        program_view_write_line(view, line, &operands[line]);
    }
}

void program_view_cursor_init(ProgramView *view) {
    window_inter_cursor_init(view->window, 0, 10);
    view->window->cursor.width = PROGRAM_VIEW_WIDTH - 2;
    cursor_enable(&view->window->cursor);
}

void program_view_handle_cursor_move(InteractWindow *window, int horizontal, int vertical) {
    cursor_move(&window->cursor, horizontal, vertical);
}

void program_view_handle_key_down(InteractWindow *window, int keycode) {

}

void program_view_init(InteractWindow *interact, ram ram, int x, int y) {
    ProgramView *view = malloc(sizeof(ProgramView));
    view->window = interact;
    view->ram = ram;

    interact->view = view;
    interact->handle_cursor_move = &program_view_handle_cursor_move;
    interact->handle_key_down = &program_view_handle_key_down;
    window_inter_init(interact, x, y, PROGRAM_VIEW_WIDTH, PROGRAM_VIEW_HEIGHT, "PROGRAM VIEW");

    DebugOperand operands[10];
    decode_operands(&operands[0], ram, 0xc004);

    program_view_print(view, &operands[0]);
    program_view_cursor_init(view);
}