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@cython.final
@cython.internal
cdef class _MemDebug:
"""Debugging support for the memory allocation in libxml2.
"""
def bytes_used(self):
"""bytes_used(self)
Returns the total amount of memory (in bytes) currently used by libxml2.
Note that libxml2 constrains this value to a C int, which limits
the accuracy on 64 bit systems.
"""
return tree.xmlMemUsed()
def blocks_used(self):
"""blocks_used(self)
Returns the total number of memory blocks currently allocated by libxml2.
Note that libxml2 constrains this value to a C int, which limits
the accuracy on 64 bit systems.
"""
return tree.xmlMemBlocks()
def dict_size(self):
"""dict_size(self)
Returns the current size of the global name dictionary used by libxml2
for the current thread. Each thread has its own dictionary.
"""
c_dict = __GLOBAL_PARSER_CONTEXT._getThreadDict(NULL)
if c_dict is NULL:
raise MemoryError()
return tree.xmlDictSize(c_dict)
def dump(self, output_file=None, byte_count=None):
"""dump(self, output_file=None, byte_count=None)
Dumps the current memory blocks allocated by libxml2 to a file.
The optional parameter 'output_file' specifies the file path. It defaults
to the file ".memorylist" in the current directory.
The optional parameter 'byte_count' limits the number of bytes in the dump.
Note that this parameter is ignored when lxml is compiled against a libxml2
version before 2.7.0.
"""
cdef Py_ssize_t c_count
if output_file is None:
output_file = b'.memorylist'
elif isinstance(output_file, unicode):
output_file.encode(sys.getfilesystemencoding())
f = stdio.fopen(output_file, "w")
if f is NULL:
raise IOError(f"Failed to create file {output_file.decode(sys.getfilesystemencoding())}")
try:
if byte_count is None:
tree.xmlMemDisplay(f)
else:
c_count = byte_count
tree.xmlMemDisplayLast(f, c_count)
finally:
stdio.fclose(f)
def show(self, output_file=None, block_count=None):
"""show(self, output_file=None, block_count=None)
Dumps the current memory blocks allocated by libxml2 to a file.
The output file format is suitable for line diffing.
The optional parameter 'output_file' specifies the file path. It defaults
to the file ".memorydump" in the current directory.
The optional parameter 'block_count' limits the number of blocks
in the dump.
"""
if output_file is None:
output_file = b'.memorydump'
elif isinstance(output_file, unicode):
output_file.encode(sys.getfilesystemencoding())
f = stdio.fopen(output_file, "w")
if f is NULL:
raise IOError(f"Failed to create file {output_file.decode(sys.getfilesystemencoding())}")
try:
tree.xmlMemShow(f, block_count if block_count is not None else tree.xmlMemBlocks())
finally:
stdio.fclose(f)
memory_debugger = _MemDebug()