[PATCH] [python] Fix getting section contents.
Anders Waldenborg
anders at 0x63.nu
Wed Apr 23 13:43:19 PDT 2014
Hi indygreg,
The returnvalue was handled as c_char_p which ment that ctypes
handled it as a NUL-terminated string making it cut the contents
at first NUL (or even worse - overrunning the buffer if it doesn't
contain a NUL).
http://reviews.llvm.org/D3474
Files:
bindings/python/llvm/object.py
bindings/python/llvm/tests/test_object.py
Index: bindings/python/llvm/object.py
===================================================================
--- bindings/python/llvm/object.py
+++ bindings/python/llvm/object.py
@@ -78,7 +78,10 @@
"""
from ctypes import c_char_p
+from ctypes import c_char
+from ctypes import POINTER
from ctypes import c_uint64
+from ctypes import string_at
from .common import CachedProperty
from .common import LLVMObject
@@ -211,7 +214,12 @@
if self.expired:
raise Exception('Section instance has expired.')
- return lib.LLVMGetSectionContents(self)
+ siz = self.size
+
+ r = lib.LLVMGetSectionContents(self)
+ if r:
+ return string_at(r, siz)
+ return None
@CachedProperty
def address(self):
@@ -462,7 +470,8 @@
library.LLVMGetSectionSize.restype = c_uint64
library.LLVMGetSectionContents.argtypes = [c_object_p]
- library.LLVMGetSectionContents.restype = c_char_p
+ # Can't use c_char_p here as it isn't a NUL-terminated string.
+ library.LLVMGetSectionContents.restype = POINTER(c_char)
library.LLVMGetSectionAddress.argtypes = [c_object_p]
library.LLVMGetSectionAddress.restype = c_uint64
Index: bindings/python/llvm/tests/test_object.py
===================================================================
--- bindings/python/llvm/tests/test_object.py
+++ bindings/python/llvm/tests/test_object.py
@@ -23,6 +23,7 @@
assert isinstance(section.size, long)
assert isinstance(section.contents, str)
assert isinstance(section.address, long)
+ assert len(section.contents) == section.size
self.assertGreater(count, 0)
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