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bpo-43683: Streamline YIELD_VALUE and SEND (GH-30723)

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* Split YIELD_VALUE into ASYNC_GEN_WRAP; YIELD_VALUE for async generators.

* Split SEND into SEND; YIELD_VALUE.

* Document new opcodes.
This commit is contained in:
Mark Shannon 2022-01-24 11:08:53 +00:00 committed by GitHub
parent d75a51bea3
commit 0367a36fdc
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 72 additions and 43 deletions
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16
Doc/library/dis.rst
View file

@ -1233,6 +1233,22 @@ All of the following opcodes use their arguments.
.. versionadded:: 3.11
.. opcode:: SEND
Sends ``None`` to the sub-generator of this generator.
Used in ``yield from`` and ``await`` statements.
.. versionadded:: 3.11
.. opcode:: ASYNC_GEN_WRAP
Wraps the value on top of the stack in an ``async_generator_wrapped_value``.
Used to yield in async generators.
.. versionadded:: 3.11
.. opcode:: HAVE_ARGUMENT
This is not really an opcode. It identifies the dividing line between

13
Include/opcode.h generated
View file

@ -44,6 +44,7 @@ extern "C" {
#define IMPORT_STAR 84
#define SETUP_ANNOTATIONS 85
#define YIELD_VALUE 86
#define ASYNC_GEN_WRAP 87
#define PREP_RERAISE_STAR 88
#define POP_EXCEPT 89
#define HAVE_ARGUMENT 90
@ -165,12 +166,12 @@ extern "C" {
#define STORE_ATTR_ADAPTIVE 79
#define STORE_ATTR_INSTANCE_VALUE 80
#define STORE_ATTR_SLOT 81
#define STORE_ATTR_WITH_HINT 87
#define LOAD_FAST__LOAD_FAST 131
#define STORE_FAST__LOAD_FAST 140
#define LOAD_FAST__LOAD_CONST 141
#define LOAD_CONST__LOAD_FAST 143
#define STORE_FAST__STORE_FAST 150
#define STORE_ATTR_WITH_HINT 131
#define LOAD_FAST__LOAD_FAST 140
#define STORE_FAST__LOAD_FAST 141
#define LOAD_FAST__LOAD_CONST 143
#define LOAD_CONST__LOAD_FAST 150
#define STORE_FAST__STORE_FAST 153
#define DO_TRACING 255
#ifdef NEED_OPCODE_JUMP_TABLES
static uint32_t _PyOpcode_RelativeJump[8] = {

3
Lib/importlib/_bootstrap_external.py
View file

@ -381,6 +381,7 @@ def _write_atomic(path, data, mode=0o666):
# Python 3.11a4 3473 (Add POP_JUMP_IF_NOT_NONE/POP_JUMP_IF_NONE opcodes)
# Python 3.11a4 3474 (Add RESUME opcode)
# Python 3.11a5 3475 (Add RETURN_GENERATOR opcode)
# Python 3.11a5 3476 (Add ASYNC_GEN_WRAP opcode)
# Python 3.12 will start with magic number 3500
@ -394,7 +395,7 @@ def _write_atomic(path, data, mode=0o666):
# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
# in PC/launcher.c must also be updated.
MAGIC_NUMBER = (3475).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3476).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'

2
Lib/opcode.py
View file

@ -101,7 +101,7 @@ def jabs_op(name, op):
def_op('IMPORT_STAR', 84)
def_op('SETUP_ANNOTATIONS', 85)
def_op('YIELD_VALUE', 86)
def_op('ASYNC_GEN_WRAP', 87)
def_op('PREP_RERAISE_STAR', 88)
def_op('POP_EXCEPT', 89)

3
Misc/NEWS.d/next/Core and Builtins/2022-01-20-17-13-49.bpo-43683.BqQ26Z.rst Normal file
View file

@ -0,0 +1,3 @@
Add ASYNC_GEN_WRAP opcode to wrap the value to be yielded in async
generators. Removes the need to special case async generators in the
``YIELD_VALUE`` instruction.

6
Objects/genobject.c
View file

@ -353,7 +353,7 @@ _PyGen_yf(PyGenObject *gen)
PyObject *bytecode = gen->gi_code->co_code;
unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode);
if (frame->f_lasti < 0) {
if (frame->f_lasti < 1) {
/* Return immediately if the frame didn't start yet. SEND
always come after LOAD_CONST: a code object should not start
with SEND */
@ -361,7 +361,7 @@ _PyGen_yf(PyGenObject *gen)
return NULL;
}
if (code[frame->f_lasti*sizeof(_Py_CODEUNIT)] != SEND || frame->stacktop < 0)
if (code[(frame->f_lasti-1)*sizeof(_Py_CODEUNIT)] != SEND || frame->stacktop < 0)
return NULL;
yf = _PyFrame_StackPeek(frame);
Py_INCREF(yf);
@ -488,6 +488,8 @@ _gen_throw(PyGenObject *gen, int close_on_genexit,
assert(frame->f_lasti >= 0);
PyObject *bytecode = gen->gi_code->co_code;
unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode);
/* Backup to SEND */
frame->f_lasti--;
assert(code[frame->f_lasti*sizeof(_Py_CODEUNIT)] == SEND);
int jump = code[frame->f_lasti*sizeof(_Py_CODEUNIT)+1];
frame->f_lasti += jump;

35
Python/ceval.c
View file

@ -2650,32 +2650,25 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
}
assert (gen_status == PYGEN_NEXT);
assert (retval != NULL);
frame->f_state = FRAME_SUSPENDED;
_PyFrame_SetStackPointer(frame, stack_pointer);
TRACE_FUNCTION_EXIT();
DTRACE_FUNCTION_EXIT();
_Py_LeaveRecursiveCall(tstate);
/* Restore previous cframe and return. */
tstate->cframe = cframe.previous;
tstate->cframe->use_tracing = cframe.use_tracing;
assert(tstate->cframe->current_frame == frame->previous);
assert(!_PyErr_Occurred(tstate));
return retval;
PUSH(retval);
DISPATCH();
}
TARGET(ASYNC_GEN_WRAP) {
PyObject *v = TOP();
assert(frame->f_code->co_flags & CO_ASYNC_GENERATOR);
PyObject *w = _PyAsyncGenValueWrapperNew(v);
if (w == NULL) {
goto error;
}
SET_TOP(w);
Py_DECREF(v);
DISPATCH();
}
TARGET(YIELD_VALUE) {
assert(frame->is_entry);
PyObject *retval = POP();
if (frame->f_code->co_flags & CO_ASYNC_GENERATOR) {
PyObject *w = _PyAsyncGenValueWrapperNew(retval);
Py_DECREF(retval);
if (w == NULL) {
retval = NULL;
goto error;
}
retval = w;
}
frame->f_state = FRAME_SUSPENDED;
_PyFrame_SetStackPointer(frame, stack_pointer);
TRACE_FUNCTION_EXIT();

25
Python/compile.c
View file

@ -910,6 +910,7 @@ stack_effect(int opcode, int oparg, int jump)
return -1;
case SETUP_ANNOTATIONS:
return 0;
case ASYNC_GEN_WRAP:
case YIELD_VALUE:
return 0;
case POP_BLOCK:
@ -1541,6 +1542,9 @@ compiler_addop_j_noline(struct compiler *c, int opcode, basicblock *b)
#define POP_EXCEPT_AND_RERAISE(C) \
RETURN_IF_FALSE(compiler_pop_except_and_reraise((C)))
#define ADDOP_YIELD(C) \
RETURN_IF_FALSE(addop_yield(C))
#define VISIT(C, TYPE, V) {\
if (!compiler_visit_ ## TYPE((C), (V))) \
return 0; \
@ -1844,6 +1848,7 @@ compiler_add_yield_from(struct compiler *c, int await)
compiler_use_next_block(c, start);
ADDOP_JUMP(c, SEND, exit);
compiler_use_next_block(c, resume);
ADDOP(c, YIELD_VALUE);
ADDOP_I(c, RESUME, await ? 3 : 2);
ADDOP_JUMP(c, JUMP_NO_INTERRUPT, start);
compiler_use_next_block(c, exit);
@ -4094,6 +4099,17 @@ addop_binary(struct compiler *c, operator_ty binop, bool inplace)
return 1;
}
static int
addop_yield(struct compiler *c) {
if (c->u->u_ste->ste_generator && c->u->u_ste->ste_coroutine) {
ADDOP(c, ASYNC_GEN_WRAP);
}
ADDOP(c, YIELD_VALUE);
ADDOP_I(c, RESUME, 1);
return 1;
}
static int
compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx)
{
@ -5144,8 +5160,7 @@ compiler_sync_comprehension_generator(struct compiler *c,
switch (type) {
case COMP_GENEXP:
VISIT(c, expr, elt);
ADDOP(c, YIELD_VALUE);
ADDOP_I(c, RESUME, 1);
ADDOP_YIELD(c);
ADDOP(c, POP_TOP);
break;
case COMP_LISTCOMP:
@ -5243,8 +5258,7 @@ compiler_async_comprehension_generator(struct compiler *c,
switch (type) {
case COMP_GENEXP:
VISIT(c, expr, elt);
ADDOP(c, YIELD_VALUE);
ADDOP_I(c, RESUME, 1);
ADDOP_YIELD(c);
ADDOP(c, POP_TOP);
break;
case COMP_LISTCOMP:
@ -5714,8 +5728,7 @@ compiler_visit_expr1(struct compiler *c, expr_ty e)
else {
ADDOP_LOAD_CONST(c, Py_None);
}
ADDOP(c, YIELD_VALUE);
ADDOP_I(c, RESUME, 1);
ADDOP_YIELD(c);
break;
case YieldFrom_kind:
if (c->u->u_ste->ste_type != FunctionBlock)

12
Python/opcode_targets.h generated
View file

@ -86,7 +86,7 @@ static void *opcode_targets[256] = {
&&TARGET_IMPORT_STAR,
&&TARGET_SETUP_ANNOTATIONS,
&&TARGET_YIELD_VALUE,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_ASYNC_GEN_WRAP,
&&TARGET_PREP_RERAISE_STAR,
&&TARGET_POP_EXCEPT,
&&TARGET_STORE_NAME,
@ -130,7 +130,7 @@ static void *opcode_targets[256] = {
&&TARGET_POP_JUMP_IF_NOT_NONE,
&&TARGET_POP_JUMP_IF_NONE,
&&TARGET_RAISE_VARARGS,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_MAKE_FUNCTION,
&&TARGET_BUILD_SLICE,
&&TARGET_JUMP_NO_INTERRUPT,
@ -139,20 +139,20 @@ static void *opcode_targets[256] = {
&&TARGET_LOAD_DEREF,
&&TARGET_STORE_DEREF,
&&TARGET_DELETE_DEREF,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_CALL_FUNCTION_EX,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_EXTENDED_ARG,
&&TARGET_LIST_APPEND,
&&TARGET_SET_ADD,
&&TARGET_MAP_ADD,
&&TARGET_LOAD_CLASSDEREF,
&&TARGET_COPY_FREE_VARS,
&&TARGET_STORE_FAST__STORE_FAST,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_RESUME,
&&TARGET_MATCH_CLASS,
&&_unknown_opcode,
&&TARGET_STORE_FAST__STORE_FAST,
&&_unknown_opcode,
&&TARGET_FORMAT_VALUE,
&&TARGET_BUILD_CONST_KEY_MAP,