fix import error

Author: Celthi

.gdbinit

@@ -1,2 +0,0 @@
-source prelude.py
-source commands.py

README.md

@@ -1,3 +1,6 @@
 # gdb_scripts
 
 Some python utils for gdb debugging.
+
+# usage
+source this package

__init__.py

@@ -1,3 +1,7 @@
 import prelude
-import commands
-import pretty_printers
+
+from commands import dt
+from commands import stackfold
+from commands import stackwalk
+
+from pretty_printers import pointer

commands/__init__.py

@@ -1,3 +0,0 @@
-import dt
-import stackfold
-import stackwalk

common.py

@@ -40,6 +40,7 @@ def is_null(val):
 
 def deref(pointer):
     '''dereference pointer to get value'''
+    # TODO: use loop to support nested pointers
     val = pointer
     if val.type.code == gdb.TYPE_CODE_PTR:
         if is_null(val):

prelude.py

@@ -1,7 +1,7 @@
 import sys
 import os
 def add_paths():
-    pythondir = '/usr/share/gcc-8.3.0/python'
+    pythondir = '/usr/share/gcc/python'
     print('add to the python sys.path: '+ pythondir)
     sys.path.append(pythondir)
     scripts_folder = os.path.dirname(__file__)

pretty_printers/__init__.py

@@ -1,2 +0,0 @@
-import guid
-import pointer

pretty_printers/guid.py

@@ -2,12 +2,11 @@
 # 1 create a printer with to_string method
 # 2 create a printer matcher
 # 3 register the printer to the gdb.
-import re
 import gdb.printing
-import sys
-
+import re
+PAT = re.compile('^(DSS_ID|_GUID)')
 
-class GUIDPrinter:
+class Printer:
     '''
     Currently, only tests in Linux
         typedef struct _GUID
@@ -43,7 +42,7 @@ def to_string(self):
 def build_pretty_printer():
     pp = gdb.printing.RegexpCollectionPrettyPrinter("Base")
     print('register DSS ID printer.')
-    pp.add_printer('DSS ID printer', '^(DSS_ID|_GUID)', GUIDPrinter)
+    pp.add_printer('DSS ID printer', PAT, Printer)
     return pp
 
 

pretty_printers/pointer.py

@@ -3,12 +3,19 @@
 # # 2 create a printer matcher
 # # 3 register the printer to the gdb.
 
-import re
 import gdb.printing
 import gdb
 import traceback
 import common
+from pretty_printers import guid
+
 gPrinters = {}
+def register_pointer_printer(pat, printer_class):
+    global gPrinters
+    print(f'register {printer_class} disptacher for pointee {pat}')
+    gPrinters[pat] = printer_class
+
+register_pointer_printer(guid.PAT, guid.Printer)
 
 def lookup_pretty_printer(val):
     try:
@@ -25,7 +32,7 @@ def lookup_pretty_printer(val):
     return None
 
 
-print('register disptacher for pointer.')
+
 gdb.printing.register_pretty_printer(
     gdb.current_objfile(),
     lookup_pretty_printer, replace=True