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/* Copyright (C) 2009 Canonical Ltd
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef _STATIC_TUPLE_H_
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#define _STATIC_TUPLE_H_
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#define STATIC_TUPLE_HAS_HASH 0
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/* Caching the hash adds memory, but allows us to save a little time during
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* lookups. TIMEIT hash(key) shows it as
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* Note that the entries themselves are strings, which already cache their
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* hashes. So while there is a 1.5:1 difference in the time for hash(), it is
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* already a function which is quite fast. Probably the only reason we might
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* want to do so, is if we customized SimpleSet to the point that the item
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* pointers were exactly certain types, and then accessed table[i]->hash
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* directly. So far StaticTuple_hash() is fast enough to not warrant the memory
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/* This defines a single variable-width key.
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* It is basically the same as a tuple, but
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* 1) Lighter weight in memory
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* 2) Only supports strings or other static types (that don't reference other
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#define STATIC_TUPLE_INTERNED_FLAG 0x01
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// We could go with unsigned short here, and support 64k width tuples
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// without any memory impact, might be worthwhile
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unsigned char _unused0;
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unsigned char _unused1;
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// Note that on 64-bit, we actually have 4-more unused bytes
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// because items will always be aligned to a 64-bit boundary
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#if STATIC_TUPLE_HAS_HASH
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extern PyTypeObject StaticTuple_Type;
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#define StaticTuple_SET_ITEM(key, offset, val) \
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((((StaticTuple*)(key))->items[(offset)]) = ((PyObject *)(val)))
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#define StaticTuple_GET_ITEM(key, offset) (((StaticTuple*)key)->items[offset])
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#ifdef STATIC_TUPLE_MODULE
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/* Used when compiling _static_tuple_c.c */
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static StaticTuple * StaticTuple_New(Py_ssize_t);
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static StaticTuple * StaticTuple_Intern(StaticTuple *self);
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static StaticTuple * StaticTuple_FromSequence(PyObject *);
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#define StaticTuple_CheckExact(op) (Py_TYPE(op) == &StaticTuple_Type)
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/* Used as the foreign api */
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#include "_import_c_api.h"
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static StaticTuple *(*StaticTuple_New)(Py_ssize_t);
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static StaticTuple *(*StaticTuple_Intern)(StaticTuple *);
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static StaticTuple *(*StaticTuple_FromSequence)(PyObject *);
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static PyTypeObject *_p_StaticTuple_Type;
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#define StaticTuple_CheckExact(op) (Py_TYPE(op) == _p_StaticTuple_Type)
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static int (*_StaticTuple_CheckExact)(PyObject *);
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/* Return -1 and set exception on error, 0 on success */
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import_static_tuple_c(void)
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struct function_description functions[] = {
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{"StaticTuple_New", (void **)&StaticTuple_New,
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"StaticTuple *(Py_ssize_t)"},
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{"StaticTuple_Intern", (void **)&StaticTuple_Intern,
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"StaticTuple *(StaticTuple *)"},
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{"StaticTuple_FromSequence", (void **)&StaticTuple_FromSequence,
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"StaticTuple *(PyObject *)"},
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{"_StaticTuple_CheckExact", (void **)&_StaticTuple_CheckExact,
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struct type_description types[] = {
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{"StaticTuple", &_p_StaticTuple_Type},
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return _import_extension_module("bzrlib._static_tuple_c",
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#endif // !STATIC_TUPLE_MODULE
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#endif // !_STATIC_TUPLE_H_
added
removed
bzrlib/_static_tuple_c.h
