gdb/macro: cache macro info to json and load directly

Use json module to save macro info to json file and load directly. It can save 2seconds for x4b projects to load plugin

Signed-off-by: xuxingliang <xuxingliang@xiaomi.com>

tools/gdb/nuttxgdb/macros.py

@@ -38,6 +38,7 @@
 # Currently, we are using the second method.
 
 import hashlib
+import json
 import os
 import re
 import time
@@ -132,30 +133,37 @@ def fetch_macro_info(file):
     with open(file, "rb") as f:
         hash = hashlib.md5(f.read()).hexdigest()
 
-    cache = path.join(path.dirname(path.abspath(file)), f"{hash}.macro")
+    macros = {}
+    p = re.compile(".*macro[ ]*:[ ]*([\S]+\(.*?\)|[\w]+)[ ]*(.*)")
+    cache = path.join(path.dirname(path.abspath(file)), f"{hash}.json")
+    print(f"Load macro: {cache}")
     if not path.isfile(cache):
-        start = time.time()
+        t = time.time()
         os.system(f'readelf -wm "{file}" > "{cache}"')
-        print(f"readelf took {time.time() - start:.1f} seconds")
+        print(f"readelf took {time.time() - t:.1f} seconds")
+
+        t = time.time()
+        with open(cache, "r") as f2:
+            for line in f2.readlines():
+                if not line.startswith(" DW_MACRO_define") and not line.startswith(
+                    " DW_MACRO_undef"
+                ):
+                    continue
+
+                if not parse_macro(line, macros, p):
+                    print(f"Failed to parse {line}")
+
+        print(f"Parse macro took {time.time() - t:.1f} seconds")
+
+        with open(cache, "w") as f2:
+            dump = json.dumps(macros, indent=4, sort_keys=True)
+            f2.write(dump)
+
         print(f"Cache macro info to {cache}")
     else:
-        print(f"Load macro info from {cache}")
+        with open(cache, "r") as f2:
+            macros = json.load(f2)
 
-    p = re.compile(".*macro[ ]*:[ ]*([\S]+\(.*?\)|[\w]+)[ ]*(.*)")
-    macros = {}
-
-    start = time.time()
-    with open(cache, "r") as f2:
-        for line in f2.readlines():
-            if not line.startswith(" DW_MACRO_define") and not line.startswith(
-                " DW_MACRO_undef"
-            ):
-                continue
-
-            if not parse_macro(line, macros, p):
-                print(f"Failed to parse {line}")
-
-    print(f"Parse macro took {time.time() - start:.1f} seconds")
     return macros
 
 

tools/gdb/nuttxgdb/utils.py

@@ -211,7 +211,6 @@ def get_symbol_value(name, locspec="nx_start", cacheable=True):
         # Try to expand macro by reading elf
         global g_macro_ctx
         if not g_macro_ctx:
-            gdb.write("No macro context found, trying to load from ELF\n")
             if len(gdb.objfiles()) > 0:
                 g_macro_ctx = MacroCtx(gdb.objfiles()[0].filename)
             else: