Reccmp comparison engine refactor (#405)

* Reccmp comparison engine refactor

* Remove redundant references to 'entry' symbol

tools/isledecomp/isledecomp/compare/lines.py

@@ -0,0 +1,58 @@
+"""Database used to match (filename, line_number) pairs
+between FUNCTION markers and PDB analysis."""
+import sqlite3
+import logging
+from typing import Optional
+from pathlib import Path
+from isledecomp.dir import PathResolver
+
+
+_SETUP_SQL = """
+    DROP TABLE IF EXISTS `lineref`;
+    CREATE TABLE `lineref` (
+        path text not null,
+        filename text not null,
+        line int not null,
+        addr int not null
+    );
+    CREATE INDEX `file_line` ON `lineref` (filename, line);
+"""
+
+
+logger = logging.getLogger(__name__)
+
+
+class LinesDb:
+    def __init__(self, code_dir) -> None:
+        self._db = sqlite3.connect(":memory:")
+        self._db.executescript(_SETUP_SQL)
+        self._path_resolver = PathResolver(code_dir)
+
+    def add_line(self, path: str, line_no: int, addr: int):
+        """To be added from the LINES section of cvdump."""
+        sourcepath = self._path_resolver.resolve_cvdump(path)
+        filename = Path(sourcepath).name.lower()
+
+        self._db.execute(
+            "INSERT INTO `lineref` (path, filename, line, addr) VALUES (?,?,?,?)",
+            (sourcepath, filename, line_no, addr),
+        )
+
+    def search_line(self, path: str, line_no: int) -> Optional[int]:
+        """Using path and line number from FUNCTION marker,
+        get the address of this function in the recomp."""
+        filename = Path(path).name.lower()
+        cur = self._db.execute(
+            "SELECT path, addr FROM `lineref` WHERE filename = ? AND line = ?",
+            (filename, line_no),
+        )
+        for source_path, addr in cur.fetchall():
+            if Path(path).samefile(source_path):
+                return addr
+
+        logger.error(
+            "Failed to find function symbol with filename and line: %s:%d",
+            path,
+            line_no,
+        )
+        return None