2026-05-02 23:04:46 +03:00
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Первый проход КВС
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Вычисляет размеры секций и адреса меток
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"""
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import sys
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sys.path.insert(0, '.')
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2026-05-17 22:37:32 +03:00
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from kvs_data import PAGE_SIZE, text_vaddr_base, align_up, INSTRUCTIONS
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from kvs_data import FIXED_SIZE_INSTRUCTIONS, VARIABLE_SIZE_INSTRUCTIONS
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# ========== РЕЖИМ ОЦЕНКИ РАЗМЕРОВ ==========
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# True — пессимистичный: все неизвестные инструкции = 10 байт (максимум)
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# False — оптимистичный: использовать точный анализ операндов
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PESSIMISTIC_SIZE_ESTIMATE = False
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2026-05-02 23:04:46 +03:00
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def unescape_string(s):
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"""Преобразует escape-последовательности в реальные символы"""
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result = []
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i = 0
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while i < len(s):
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if s[i] == '\\' and i + 1 < len(s):
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if s[i + 1] == 'n':
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result.append('\n')
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elif s[i + 1] == 't':
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result.append('\t')
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elif s[i + 1] == 'r':
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result.append('\r')
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else:
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result.append(s[i])
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result.append(s[i + 1])
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i += 2
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else:
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result.append(s[i])
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i += 1
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return ''.join(result)
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def read_ast(input_file):
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ast_lines = []
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with open(input_file, 'r', encoding='utf-8') as f:
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for line in f:
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ast_lines.append(line.strip())
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return ast_lines
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2026-05-17 12:21:28 +03:00
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def is_hex_number(s):
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"""Проверяет, является ли строка шестнадцатеричным числом"""
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if len(s) < 3:
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return False
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if not (s[0] == '0' and (s[1] == 'x' or s[1] == 'X')):
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return False
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for ch in s[2:]:
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if not (('0' <= ch <= '9') or ('a' <= ch <= 'f') or ('A' <= ch <= 'F')):
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return False
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return True
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def is_dec_number(s):
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"""Проверяет, является ли строка десятичным числом (возможно с минусом)"""
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if not s:
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return False
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start = 0
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if s[0] == '-':
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if len(s) == 1:
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return False
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start = 1
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for ch in s[start:]:
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if ch < '0' or ch > '9':
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return False
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return True
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def is_register(s):
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"""Проверяет, является ли строка именем регистра"""
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return s in ['раикс', 'рбикс', 'рсикс', 'рдикс', 'рсипи', 'рбипи', 'рсиай', 'рдиай',
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'р8', 'р9', 'р10', 'р11', 'р12', 'р13', 'р14', 'р15']
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def split_by_operators(content):
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"""
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Разбивает строку по операторам + и - с сохранением операторов.
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Аналог re.split(r'([+\-])', content)
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Пример: "раикс + рбикс*4 - 8" -> ["раикс ", "+", " рбикс*4 ", "-", " 8"]
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"""
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parts = []
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current = ''
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for ch in content:
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if ch == '+' or ch == '-':
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if current:
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parts.append(current)
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parts.append(ch)
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current = ''
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else:
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current += ch
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if current:
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parts.append(current)
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return parts
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2026-05-11 15:08:03 +03:00
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def parse_memory_operand(operand_str):
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"""
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Анализирует операнд памяти вида [reg + reg*scale + disp]
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2026-05-17 22:37:32 +03:00
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Возвращает словарь с информацией.
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2026-05-11 15:08:03 +03:00
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"""
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if not operand_str.startswith('[') or not operand_str.endswith(']'):
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return None
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content = operand_str[1:-1].strip()
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if not content:
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return None
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result = {
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'has_base': False,
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'base_reg': None,
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'has_index': False,
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'index_reg': None,
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'scale': 1,
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'has_disp': False,
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'disp_value': 0,
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'disp_size': 0
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}
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2026-05-17 12:21:28 +03:00
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if is_dec_number(content) or is_hex_number(content):
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2026-05-11 15:08:03 +03:00
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result['has_disp'] = True
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2026-05-17 12:21:28 +03:00
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if content.startswith('0x') or content.startswith('0X'):
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2026-05-11 15:08:03 +03:00
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result['disp_value'] = int(content, 16)
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else:
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result['disp_value'] = int(content)
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result['disp_size'] = 4
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return result
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2026-05-17 12:21:28 +03:00
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if is_register(content):
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2026-05-11 15:08:03 +03:00
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result['has_base'] = True
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result['base_reg'] = content
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return result
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2026-05-17 12:21:28 +03:00
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parts = split_by_operators(content)
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2026-05-11 15:08:03 +03:00
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for part in parts:
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part = part.strip()
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2026-05-17 12:21:28 +03:00
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if not part or part == '+' or part == '-':
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2026-05-11 15:08:03 +03:00
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continue
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2026-05-17 12:21:28 +03:00
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if is_register(part):
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2026-05-11 15:08:03 +03:00
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if not result['has_base']:
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result['has_base'] = True
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result['base_reg'] = part
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elif not result['has_index']:
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result['has_index'] = True
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result['index_reg'] = part
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2026-05-17 12:21:28 +03:00
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elif is_dec_number(part) or is_hex_number(part):
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2026-05-11 15:08:03 +03:00
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result['has_disp'] = True
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2026-05-17 12:21:28 +03:00
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if part.startswith('0x') or part.startswith('0X'):
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2026-05-11 15:08:03 +03:00
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result['disp_value'] = int(part, 16)
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else:
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result['disp_value'] = int(part)
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elif '*' in part:
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2026-05-17 12:21:28 +03:00
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star_pos = part.find('*')
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if star_pos != -1:
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reg_part = part[:star_pos].strip()
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scale_part = part[star_pos + 1:].strip()
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if is_register(reg_part):
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result['has_index'] = True
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result['index_reg'] = reg_part
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result['scale'] = int(scale_part)
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2026-05-11 15:08:03 +03:00
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if result['has_disp']:
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if -128 <= result['disp_value'] <= 127:
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result['disp_size'] = 1
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else:
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result['disp_size'] = 4
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return result
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def estimate_memory_operand_size(operand_str):
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"""Оценивает размер операнда памяти в байтах (ModR/M + SIB + disp)"""
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if not operand_str:
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return 0
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addr_mode = parse_memory_operand(operand_str)
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if addr_mode is None:
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return 0
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size = 1
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if addr_mode['has_index']:
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size += 1
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if addr_mode['has_disp']:
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size += addr_mode['disp_size']
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return size
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2026-05-02 23:04:46 +03:00
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class Pass1:
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def __init__(self):
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self.labels = {}
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self.label_sections = {}
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self.symbols = {}
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2026-05-17 11:22:39 +03:00
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self.position = {".text": 0, ".data": 0, ".бнд": 0}
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self.current_section = ".text"
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self.entry_point = "_start"
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def process_line(self, line):
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parts = line.split(':')
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line_type = parts[0]
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if line_type == "DIRECTIVE":
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directive = parts[1]
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if directive == '.текст':
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self.current_section = ".text"
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elif directive == '.данные':
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self.current_section = ".data"
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2026-05-17 11:22:39 +03:00
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elif directive == '.бнд':
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self.current_section = ".бнд"
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2026-05-02 23:04:46 +03:00
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elif directive == '.глобал':
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self.entry_point = parts[2]
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elif directive in ('.строка_нуль', '.строка'):
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s = parts[3] if len(parts) > 3 else ""
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real_s = unescape_string(s)
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bstring = real_s.encode('utf-8')
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add_null = (directive == '.строка_нуль')
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size = len(bstring) + (1 if add_null else 0)
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self.position[".data"] += size
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elif directive == '.константа':
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name = parts[2]
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value_str = parts[3]
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if is_dec_number(value_str):
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self.symbols[name] = int(value_str)
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elif is_hex_number(value_str):
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self.symbols[name] = int(value_str, 16)
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else:
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self.symbols[name] = 0
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elif directive == '.байт':
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sec = parts[2]
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if len(parts) > 3 and parts[3]:
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num_bytes = 1
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for ch in parts[3]:
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if ch == ',':
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num_bytes += 1
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2026-05-02 23:04:46 +03:00
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self.position[sec] += num_bytes
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2026-05-17 11:22:39 +03:00
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elif directive == '.резб':
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count = int(parts[3])
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self.position['.бнд'] += count * 1
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elif directive == '.резс':
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count = int(parts[3])
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self.position['.бнд'] += count * 2
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elif directive == '.рездс':
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count = int(parts[3])
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self.position['.бнд'] += count * 4
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elif directive == '.резкс':
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count = int(parts[3])
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self.position['.бнд'] += count * 8
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2026-05-02 23:04:46 +03:00
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elif line_type == "LABEL":
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label_name = parts[1]
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sec = parts[2]
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self.labels[label_name] = self.position[sec]
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self.label_sections[label_name] = sec
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elif line_type == "INSTR":
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mnemonic = parts[1]
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sec = parts[2]
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operands_str = parts[3] if len(parts) > 3 else ""
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operands = []
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if operands_str:
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current = ''
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for ch in operands_str:
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if ch == ',':
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operands.append(current)
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current = ''
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else:
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current += ch
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if current:
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operands.append(current)
|
2026-05-11 15:08:03 +03:00
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size = self.estimate_size(mnemonic, operands)
|
2026-05-02 23:04:46 +03:00
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self.position[sec] += size
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|
2026-05-11 15:08:03 +03:00
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def estimate_size(self, mnemonic, operands):
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"""Динамический расчёт размера инструкции"""
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|
2026-05-17 22:37:32 +03:00
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# Инструкции с фиксированным размером
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if mnemonic in FIXED_SIZE_INSTRUCTIONS:
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|
return FIXED_SIZE_INSTRUCTIONS[mnemonic]
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|
# Инструкции с переменным размером — анализируем операнды
|
2026-05-11 15:08:03 +03:00
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if mnemonic in ("загрузить", "сохранить", "загрузить_адрес"):
|
2026-05-17 22:37:32 +03:00
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|
for op in operands:
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if op.startswith('MEM:reg_indirect:'):
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return 3 # косвенная: REX + opcode + ModR/M
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|
return 7 # абсолютная: REX + opcode + ModR/M + disp32
|
2026-05-11 15:08:03 +03:00
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|
2026-05-17 22:37:32 +03:00
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|
if mnemonic in ("втолкнуть", "вытолкнуть"):
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|
if operands:
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reg = operands[0]
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if reg in ('р8', 'р9', 'р10', 'р11', 'р12', 'р13', 'р14', 'р15'):
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return 2 # нужен REX-префикс
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|
return 1 # без REX
|
2026-05-11 15:08:03 +03:00
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|
2026-05-17 22:37:32 +03:00
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if mnemonic in ("прибавить_непосредственно", "вычесть_непосредственно", "сравнить_с"):
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|
return 7 # пессимистично: REX + opcode + ModR/M + imm32
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|
if mnemonic == "переместить_имм":
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|
return 10 # пессимистично: mov reg64, imm64
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|
if mnemonic in ("переместить_с_нулями", "переместить_со_знаком"):
|
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|
|
return 8 # REX + 3-байтный opcode + ModR/M + disp32
|
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|
|
if mnemonic == "загрузить_байт":
|
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|
|
|
|
return 2 # opcode + imm8
|
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|
|
|
|
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|
|
|
if mnemonic == "втолкнуть_непосредственно":
|
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|
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|
|
return 5 # пессимистично: opcode + imm32
|
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|
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|
|
|
|
|
|
# Неизвестная инструкция
|
|
|
|
|
|
if PESSIMISTIC_SIZE_ESTIMATE:
|
|
|
|
|
|
return 10
|
|
|
|
|
|
else:
|
|
|
|
|
|
return 3
|
2026-05-02 23:04:46 +03:00
|
|
|
|
|
|
|
|
|
|
def calculate_layout(self):
|
|
|
|
|
|
text_size = self.position[".text"]
|
|
|
|
|
|
data_size = self.position[".data"]
|
2026-05-17 11:22:39 +03:00
|
|
|
|
bnd_size = self.position[".бнд"]
|
2026-05-02 23:04:46 +03:00
|
|
|
|
|
|
|
|
|
|
elf_header_size = 64
|
|
|
|
|
|
ph_size = 56
|
|
|
|
|
|
ph_num = 3
|
|
|
|
|
|
ph_table_size = ph_num * ph_size
|
|
|
|
|
|
|
|
|
|
|
|
offset_text = align_up(elf_header_size + ph_table_size, PAGE_SIZE)
|
|
|
|
|
|
offset_data = align_up(offset_text + text_size, PAGE_SIZE)
|
|
|
|
|
|
vaddr_text = text_vaddr_base
|
|
|
|
|
|
vaddr_data = align_up(vaddr_text + text_size, PAGE_SIZE)
|
2026-05-17 16:15:27 +03:00
|
|
|
|
vaddr_bnd = vaddr_data + PAGE_SIZE
|
2026-05-02 23:04:46 +03:00
|
|
|
|
|
|
|
|
|
|
comment_size = len("Сборщик КВС".encode('utf-8')) + 1
|
|
|
|
|
|
offset_comment = align_up(offset_data + data_size, 1)
|
|
|
|
|
|
|
2026-05-17 11:22:39 +03:00
|
|
|
|
if bnd_size > 0:
|
|
|
|
|
|
shstrtab_content = b"\x00.text\x00.data\x00.bss\x00.comment\x00.shstrtab\x00"
|
|
|
|
|
|
else:
|
|
|
|
|
|
shstrtab_content = b"\x00.text\x00.data\x00.comment\x00.shstrtab\x00"
|
|
|
|
|
|
shstrtab_size = len(shstrtab_content)
|
2026-05-02 23:04:46 +03:00
|
|
|
|
shstrtab_offset = align_up(offset_comment + comment_size, 8)
|
|
|
|
|
|
shdr_offset = align_up(shstrtab_offset + shstrtab_size, 16)
|
|
|
|
|
|
|
|
|
|
|
|
return {
|
|
|
|
|
|
"text_size": text_size,
|
|
|
|
|
|
"data_size": data_size,
|
2026-05-17 11:22:39 +03:00
|
|
|
|
"bnd_size": bnd_size,
|
2026-05-02 23:04:46 +03:00
|
|
|
|
"offset_text": offset_text,
|
|
|
|
|
|
"offset_data": offset_data,
|
|
|
|
|
|
"vaddr_text": vaddr_text,
|
|
|
|
|
|
"vaddr_data": vaddr_data,
|
2026-05-17 11:22:39 +03:00
|
|
|
|
"vaddr_bnd": vaddr_bnd,
|
2026-05-02 23:04:46 +03:00
|
|
|
|
"offset_comment": offset_comment,
|
|
|
|
|
|
"comment_size": comment_size,
|
|
|
|
|
|
"shstrtab_offset": shstrtab_offset,
|
|
|
|
|
|
"shstrtab_size": shstrtab_size,
|
|
|
|
|
|
"shdr_offset": shdr_offset,
|
|
|
|
|
|
"entry_point": self.entry_point,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
def write_pass1(pass1_data, labels, label_sections, symbols, output_file):
|
|
|
|
|
|
with open(output_file, 'w', encoding='utf-8') as f:
|
|
|
|
|
|
for key, value in pass1_data.items():
|
|
|
|
|
|
f.write(f"PARAM:{key}:{value}\n")
|
|
|
|
|
|
for label, pos in labels.items():
|
|
|
|
|
|
sec = label_sections.get(label, ".text")
|
|
|
|
|
|
f.write(f"LABEL:{label}:{sec}:{pos}\n")
|
|
|
|
|
|
for name, value in symbols.items():
|
|
|
|
|
|
f.write(f"SYMBOL:{name}:{value}\n")
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
|
|
if len(sys.argv) != 3:
|
|
|
|
|
|
print("Использование: python kvs_pass1.py <вход.аст> <выход.проход1>")
|
|
|
|
|
|
sys.exit(1)
|
|
|
|
|
|
|
|
|
|
|
|
ast_lines = read_ast(sys.argv[1])
|
|
|
|
|
|
pass1 = Pass1()
|
|
|
|
|
|
for line in ast_lines:
|
|
|
|
|
|
pass1.process_line(line)
|
|
|
|
|
|
|
|
|
|
|
|
layout = pass1.calculate_layout()
|
|
|
|
|
|
write_pass1(layout, pass1.labels, pass1.label_sections, pass1.symbols, sys.argv[2])
|
2026-05-17 16:15:27 +03:00
|
|
|
|
|
2026-05-17 22:37:32 +03:00
|
|
|
|
print(f"Проход 1 (режим: {'пессимистичный' if PESSIMISTIC_SIZE_ESTIMATE else 'оптимистичный'}):")
|
2026-05-17 16:15:27 +03:00
|
|
|
|
print(f" .text: размер={layout['text_size']} байт, смещение_в_файле=0x{layout['offset_text']:x}, виртуальный_адрес=0x{layout['vaddr_text']:x}")
|
|
|
|
|
|
print(f" .data: размер={layout['data_size']} байт, смещение_в_файле=0x{layout['offset_data']:x}, виртуальный_адрес=0x{layout['vaddr_data']:x}")
|
|
|
|
|
|
print(f" .бнд: размер={layout['bnd_size']} байт, виртуальный_адрес=0x{layout['vaddr_bnd']:x}")
|
|
|
|
|
|
print(f" entry_point: {layout['entry_point']}")
|
|
|
|
|
|
print(f" метки:")
|
|
|
|
|
|
for label, pos in pass1.labels.items():
|
|
|
|
|
|
sec = pass1.label_sections.get(label, ".text")
|
|
|
|
|
|
if sec == ".text":
|
|
|
|
|
|
addr = layout['vaddr_text'] + pos
|
|
|
|
|
|
elif sec == ".data":
|
|
|
|
|
|
addr = layout['vaddr_data'] + pos
|
|
|
|
|
|
elif sec == ".бнд":
|
|
|
|
|
|
addr = layout['vaddr_bnd'] + pos
|
|
|
|
|
|
else:
|
|
|
|
|
|
addr = pos
|
|
|
|
|
|
print(f" {label}: секция={sec}, смещение={pos}, адрес=0x{addr:x}")
|