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Issue #19087: Improve bytearray allocation in order to allow cheap popping of data at the front (slice deletion).

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This commit is contained in:
Antoine Pitrou 2013-10-05 21:12:18 +02:00
parent dcd01b4932
commit 5df8a8a1fd
5 changed files with 182 additions and 151 deletions
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11
Include/bytearrayobject.h
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@ -22,10 +22,11 @@ extern "C" {
#ifndef Py_LIMITED_API
typedef struct {
PyObject_VAR_HEAD
Py_ssize_t ob_alloc; /* How many bytes allocated in ob_buffer */
char *ob_bytes; /* Physical backing buffer */
char *ob_start; /* Logical start inside ob_bytes */
/* XXX(nnorwitz): should ob_exports be Py_ssize_t? */
int ob_exports; /* how many buffer exports */
Py_ssize_t ob_alloc; /* How many bytes allocated */
char *ob_bytes;
int ob_exports; /* How many buffer exports */
} PyByteArrayObject;
#endif
@ -49,8 +50,8 @@ PyAPI_FUNC(int) PyByteArray_Resize(PyObject *, Py_ssize_t);
#ifndef Py_LIMITED_API
#define PyByteArray_AS_STRING(self) \
(assert(PyByteArray_Check(self)), \
Py_SIZE(self) ? ((PyByteArrayObject *)(self))->ob_bytes : _PyByteArray_empty_string)
#define PyByteArray_GET_SIZE(self) (assert(PyByteArray_Check(self)),Py_SIZE(self))
Py_SIZE(self) ? ((PyByteArrayObject *)(self))->ob_start : _PyByteArray_empty_string)
#define PyByteArray_GET_SIZE(self) (assert(PyByteArray_Check(self)), Py_SIZE(self))
PyAPI_DATA(char) _PyByteArray_empty_string[];
#endif