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bpo-26219: per opcode cache for LOAD_GLOBAL (GH-12884)

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This patch implements per opcode cache mechanism, and use it in
only LOAD_GLOBAL opcode.

Based on Yury's opcache3.patch in bpo-26219.
This commit is contained in:
Inada Naoki 2019-06-03 21:30:58 +09:00 • committed by GitHub
parent 29ec422810
commit 91234a1636
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 285 additions and 16 deletions
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17
Include/code.h
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@ -17,6 +17,8 @@ typedef uint16_t _Py_CODEUNIT;
# define _Py_OPARG(word) ((word) >> 8)
#endif
typedef struct _PyOpcache _PyOpcache;
/* Bytecode object */
typedef struct {
PyObject_HEAD
@ -49,6 +51,21 @@ typedef struct {
Type is a void* to keep the format private in codeobject.c to force
people to go through the proper APIs. */
void *co_extra;
/* Per opcodes just-in-time cache
*
* To reduce cache size, we use indirect mapping from opcode index to
* cache object:
* cache = co_opcache[co_opcache_map[next_instr - first_instr] - 1]
*/
// co_opcache_map is indexed by (next_instr - first_instr).
// * 0 means there is no cache for this opcode.
// * n > 0 means there is cache in co_opcache[n-1].
unsigned char *co_opcache_map;
_PyOpcache *co_opcache;
int co_opcache_flag; // used to determine when create a cache.
unsigned char co_opcache_size; // length of co_opcache.
} PyCodeObject;
/* Masks for co_flags above */