feat: Phase 3+4 - gcov support + enhanced report

hina/gcov_collector.py

@@ -0,0 +1,57 @@
+import subprocess
+import logging
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+
+def collect_gcov(cobol_src: Path, work_dir: Path) -> dict:
+    try:
+        gcda_files = list(work_dir.glob("*.gcda"))
+        if not gcda_files:
+            logger.warning("[gcov] 未找到 .gcda 文件，可能未启用插桩编译")
+            return {"available": False, "reason": "no_gcda_files"}
+
+        result = subprocess.run(
+            ["gcov", cobol_src.name],
+            capture_output=True, text=True, timeout=30,
+            cwd=work_dir,
+        )
+
+        if result.returncode != 0:
+            logger.warning(f"[gcov] gcov 执行失败: {result.stderr[:200]}")
+            return {"available": False, "reason": "gcov_failed"}
+
+        gcov_file = work_dir / f"{cobol_src.stem}.cbl.gcov"
+        if not gcov_file.exists():
+            gcov_file = work_dir / f"{cobol_src.stem}.gcov"
+
+        if not gcov_file.exists():
+            logger.warning("[gcov] .gcov 文件未生成")
+            return {"available": False, "reason": "no_gcov_output"}
+
+        total_lines = 0
+        executed_lines = 0
+        with open(gcov_file) as f:
+            for line in f:
+                stripped = line.strip()
+                if stripped and not stripped.startswith("-"):
+                    total_lines += 1
+                    if not stripped.startswith("#"):
+                        executed_lines += 1
+
+        line_rate = executed_lines / max(total_lines, 1)
+
+        return {
+            "available": True,
+            "line_rate": round(line_rate, 4),
+            "total_lines": total_lines,
+            "executed_lines": executed_lines,
+        }
+
+    except FileNotFoundError:
+        logger.warning("[gcov] gcov 命令未找到，降级为仅静态分析")
+        return {"available": False, "reason": "gcov_not_installed"}
+    except Exception as e:
+        logger.warning(f"[gcov] 采集异常: {e}")
+        return {"available": False, "reason": str(e)[:100]}