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circuitpython/py/vm.c
Damien George dd11af209d py: Add LOAD_SUPER_METHOD bytecode to allow heap-free super meth calls. 
This patch allows the following code to run without allocating on the heap:

    super().foo(...)

Before this patch such a call would allocate a super object on the heap and
then load the foo method and call it right away.  The super object is only
needed to perform the lookup of the method and not needed after that.  This
patch makes an optimisation to allocate the super object on the C stack and
discard it right after use.

Changes in code size due to this patch are:

   bare-arm: +128
    minimal: +232
   unix x64: +416
unix nanbox: +364
     stmhal: +184
    esp8266: +340
     cc3200: +128
2017-04-22 23:39:20 +10:00

1456 lines
61 KiB
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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "py/mpstate.h"
#include "py/nlr.h"
#include "py/emitglue.h"
#include "py/objtype.h"
#include "py/runtime.h"
#include "py/bc0.h"
#include "py/bc.h"
#if 0
#define TRACE(ip) printf("sp=%d ", (int)(sp - &code_state->state[0] + 1)); mp_bytecode_print2(ip, 1, code_state->fun_bc->const_table);
#else
#define TRACE(ip)
#endif
// Value stack grows up (this makes it incompatible with native C stack, but
// makes sure that arguments to functions are in natural order arg1..argN
// (Python semantics mandates left-to-right evaluation order, including for
// function arguments). Stack pointer is pre-incremented and points at the
// top element.
// Exception stack also grows up, top element is also pointed at.
// Exception stack unwind reasons (WHY_* in CPython-speak)
// TODO perhaps compress this to RETURN=0, JUMP>0, with number of unwinds
// left to do encoded in the JUMP number
typedef enum {
UNWIND_RETURN = 1,
UNWIND_JUMP,
} mp_unwind_reason_t;
#define DECODE_UINT \
mp_uint_t unum = 0; \
do { \
unum = (unum << 7) + (*ip & 0x7f); \
} while ((*ip++ & 0x80) != 0)
#define DECODE_ULABEL size_t ulab = (ip[0] | (ip[1] << 8)); ip += 2
#define DECODE_SLABEL size_t slab = (ip[0] | (ip[1] << 8)) - 0x8000; ip += 2
#if MICROPY_PERSISTENT_CODE
#define DECODE_QSTR \
qstr qst = ip[0] | ip[1] << 8; \
ip += 2;
#define DECODE_PTR \
DECODE_UINT; \
void *ptr = (void*)(uintptr_t)code_state->fun_bc->const_table[unum]
#define DECODE_OBJ \
DECODE_UINT; \
mp_obj_t obj = (mp_obj_t)code_state->fun_bc->const_table[unum]
#else
#define DECODE_QSTR qstr qst = 0; \
do { \
qst = (qst << 7) + (*ip & 0x7f); \
} while ((*ip++ & 0x80) != 0)
#define DECODE_PTR \
ip = (byte*)MP_ALIGN(ip, sizeof(void*)); \
void *ptr = *(void**)ip; \
ip += sizeof(void*)
#define DECODE_OBJ \
ip = (byte*)MP_ALIGN(ip, sizeof(mp_obj_t)); \
mp_obj_t obj = *(mp_obj_t*)ip; \
ip += sizeof(mp_obj_t)
#endif
#define PUSH(val) *++sp = (val)
#define POP() (*sp--)
#define TOP() (*sp)
#define SET_TOP(val) *sp = (val)
#if MICROPY_PY_SYS_EXC_INFO
#define CLEAR_SYS_EXC_INFO() MP_STATE_VM(cur_exception) = NULL;
#else
#define CLEAR_SYS_EXC_INFO()
#endif
#define PUSH_EXC_BLOCK(with_or_finally) do { \
DECODE_ULABEL; /* except labels are always forward */ \
++exc_sp; \
exc_sp->handler = ip + ulab; \
exc_sp->val_sp = MP_TAGPTR_MAKE(sp, ((with_or_finally) << 1) | currently_in_except_block); \
exc_sp->prev_exc = NULL; \
currently_in_except_block = 0; /* in a try block now */ \
} while (0)
#define POP_EXC_BLOCK() \
currently_in_except_block = MP_TAGPTR_TAG0(exc_sp->val_sp); /* restore previous state */ \
exc_sp--; /* pop back to previous exception handler */ \
CLEAR_SYS_EXC_INFO() /* just clear sys.exc_info(), not compliant, but it shouldn't be used in 1st place */
// fastn has items in reverse order (fastn[0] is local[0], fastn[-1] is local[1], etc)
// sp points to bottom of stack which grows up
// returns:
// MP_VM_RETURN_NORMAL, sp valid, return value in *sp
// MP_VM_RETURN_YIELD, ip, sp valid, yielded value in *sp
// MP_VM_RETURN_EXCEPTION, exception in fastn[0]
mp_vm_return_kind_t mp_execute_bytecode(mp_code_state_t *code_state, volatile mp_obj_t inject_exc) {
#define SELECTIVE_EXC_IP (0)
#if SELECTIVE_EXC_IP
#define MARK_EXC_IP_SELECTIVE() { code_state->ip = ip; } /* stores ip 1 byte past last opcode */
#define MARK_EXC_IP_GLOBAL()
#else
#define MARK_EXC_IP_SELECTIVE()
#define MARK_EXC_IP_GLOBAL() { code_state->ip = ip; } /* stores ip pointing to last opcode */
#endif
#if MICROPY_OPT_COMPUTED_GOTO
#include "py/vmentrytable.h"
#define DISPATCH() do { \
TRACE(ip); \
MARK_EXC_IP_GLOBAL(); \
goto *entry_table[*ip++]; \
} while (0)
#define DISPATCH_WITH_PEND_EXC_CHECK() goto pending_exception_check
#define ENTRY(op) entry_##op
#define ENTRY_DEFAULT entry_default
#else
#define DISPATCH() break
#define DISPATCH_WITH_PEND_EXC_CHECK() goto pending_exception_check
#define ENTRY(op) case op
#define ENTRY_DEFAULT default
#endif
// nlr_raise needs to be implemented as a goto, so that the C compiler's flow analyser
// sees that it's possible for us to jump from the dispatch loop to the exception
// handler. Without this, the code may have a different stack layout in the dispatch
// loop and the exception handler, leading to very obscure bugs.
#define RAISE(o) do { nlr_pop(); nlr.ret_val = MP_OBJ_TO_PTR(o); goto exception_handler; } while (0)
#if MICROPY_STACKLESS
run_code_state: ;
#endif
// Pointers which are constant for particular invocation of mp_execute_bytecode()
size_t n_state = mp_decode_uint_value(code_state->fun_bc->bytecode);
mp_obj_t * /*const*/ fastn = &code_state->state[n_state - 1];
mp_exc_stack_t * /*const*/ exc_stack = (mp_exc_stack_t*)(code_state->state + n_state);
// variables that are visible to the exception handler (declared volatile)
volatile bool currently_in_except_block = MP_TAGPTR_TAG0(code_state->exc_sp); // 0 or 1, to detect nested exceptions
mp_exc_stack_t *volatile exc_sp = MP_TAGPTR_PTR(code_state->exc_sp); // stack grows up, exc_sp points to top of stack
#if MICROPY_PY_THREAD_GIL && MICROPY_PY_THREAD_GIL_VM_DIVISOR
// This needs to be volatile and outside the VM loop so it persists across handling
// of any exceptions. Otherwise it's possible that the VM never gives up the GIL.
volatile int gil_divisor = MICROPY_PY_THREAD_GIL_VM_DIVISOR;
#endif
// outer exception handling loop
for (;;) {
nlr_buf_t nlr;
outer_dispatch_loop:
if (nlr_push(&nlr) == 0) {
// local variables that are not visible to the exception handler
const byte *ip = code_state->ip;
mp_obj_t *sp = code_state->sp;
mp_obj_t obj_shared;
MICROPY_VM_HOOK_INIT
// If we have exception to inject, now that we finish setting up
// execution context, raise it. This works as if RAISE_VARARGS
// bytecode was executed.
// Injecting exc into yield from generator is a special case,
// handled by MP_BC_YIELD_FROM itself
if (inject_exc != MP_OBJ_NULL && *ip != MP_BC_YIELD_FROM) {
mp_obj_t exc = inject_exc;
inject_exc = MP_OBJ_NULL;
exc = mp_make_raise_obj(exc);
RAISE(exc);
}
// loop to execute byte code
for (;;) {
dispatch_loop:
#if MICROPY_OPT_COMPUTED_GOTO
DISPATCH();
#else
TRACE(ip);
MARK_EXC_IP_GLOBAL();
switch (*ip++) {
#endif
ENTRY(MP_BC_LOAD_CONST_FALSE):
PUSH(mp_const_false);
DISPATCH();
ENTRY(MP_BC_LOAD_CONST_NONE):
PUSH(mp_const_none);
DISPATCH();
ENTRY(MP_BC_LOAD_CONST_TRUE):
PUSH(mp_const_true);
DISPATCH();
ENTRY(MP_BC_LOAD_CONST_SMALL_INT): {
mp_int_t num = 0;
if ((ip[0] & 0x40) != 0) {
// Number is negative
num--;
}
do {
num = (num << 7) | (*ip & 0x7f);
} while ((*ip++ & 0x80) != 0);
PUSH(MP_OBJ_NEW_SMALL_INT(num));
DISPATCH();
}
ENTRY(MP_BC_LOAD_CONST_STRING): {
DECODE_QSTR;
PUSH(MP_OBJ_NEW_QSTR(qst));
DISPATCH();
}
ENTRY(MP_BC_LOAD_CONST_OBJ): {
DECODE_OBJ;
PUSH(obj);
DISPATCH();
}
ENTRY(MP_BC_LOAD_NULL):
PUSH(MP_OBJ_NULL);
DISPATCH();
ENTRY(MP_BC_LOAD_FAST_N): {
DECODE_UINT;
obj_shared = fastn[-unum];
load_check:
if (obj_shared == MP_OBJ_NULL) {
local_name_error: {
MARK_EXC_IP_SELECTIVE();
mp_obj_t obj = mp_obj_new_exception_msg(&mp_type_NameError, "local variable referenced before assignment");
RAISE(obj);
}
}
PUSH(obj_shared);
DISPATCH();
}
ENTRY(MP_BC_LOAD_DEREF): {
DECODE_UINT;
obj_shared = mp_obj_cell_get(fastn[-unum]);
goto load_check;
}
#if !MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
ENTRY(MP_BC_LOAD_NAME): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
PUSH(mp_load_name(qst));
DISPATCH();
}
#else
ENTRY(MP_BC_LOAD_NAME): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t key = MP_OBJ_NEW_QSTR(qst);
mp_uint_t x = *ip;
if (x < mp_locals_get()->map.alloc && mp_locals_get()->map.table[x].key == key) {
PUSH(mp_locals_get()->map.table[x].value);
} else {
mp_map_elem_t *elem = mp_map_lookup(&mp_locals_get()->map, MP_OBJ_NEW_QSTR(qst), MP_MAP_LOOKUP);
if (elem != NULL) {
*(byte*)ip = (elem - &mp_locals_get()->map.table[0]) & 0xff;
PUSH(elem->value);
} else {
PUSH(mp_load_name(MP_OBJ_QSTR_VALUE(key)));
}
}
ip++;
DISPATCH();
}
#endif
#if !MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
ENTRY(MP_BC_LOAD_GLOBAL): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
PUSH(mp_load_global(qst));
DISPATCH();
}
#else
ENTRY(MP_BC_LOAD_GLOBAL): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t key = MP_OBJ_NEW_QSTR(qst);
mp_uint_t x = *ip;
if (x < mp_globals_get()->map.alloc && mp_globals_get()->map.table[x].key == key) {
PUSH(mp_globals_get()->map.table[x].value);
} else {
mp_map_elem_t *elem = mp_map_lookup(&mp_globals_get()->map, MP_OBJ_NEW_QSTR(qst), MP_MAP_LOOKUP);
if (elem != NULL) {
*(byte*)ip = (elem - &mp_globals_get()->map.table[0]) & 0xff;
PUSH(elem->value);
} else {
PUSH(mp_load_global(MP_OBJ_QSTR_VALUE(key)));
}
}
ip++;
DISPATCH();
}
#endif
#if !MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
ENTRY(MP_BC_LOAD_ATTR): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
SET_TOP(mp_load_attr(TOP(), qst));
DISPATCH();
}
#else
ENTRY(MP_BC_LOAD_ATTR): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t top = TOP();
if (mp_obj_get_type(top)->attr == mp_obj_instance_attr) {
mp_obj_instance_t *self = MP_OBJ_TO_PTR(top);
mp_uint_t x = *ip;
mp_obj_t key = MP_OBJ_NEW_QSTR(qst);
mp_map_elem_t *elem;
if (x < self->members.alloc && self->members.table[x].key == key) {
elem = &self->members.table[x];
} else {
elem = mp_map_lookup(&self->members, key, MP_MAP_LOOKUP);
if (elem != NULL) {
*(byte*)ip = elem - &self->members.table[0];
} else {
goto load_attr_cache_fail;
}
}
SET_TOP(elem->value);
ip++;
DISPATCH();
}
load_attr_cache_fail:
SET_TOP(mp_load_attr(top, qst));
ip++;
DISPATCH();
}
#endif
ENTRY(MP_BC_LOAD_METHOD): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_load_method(*sp, qst, sp);
sp += 1;
DISPATCH();
}
ENTRY(MP_BC_LOAD_SUPER_METHOD): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
sp -= 1;
mp_load_super_method(qst, sp - 1);
DISPATCH();
}
ENTRY(MP_BC_LOAD_BUILD_CLASS):
MARK_EXC_IP_SELECTIVE();
PUSH(mp_load_build_class());
DISPATCH();
ENTRY(MP_BC_LOAD_SUBSCR): {
MARK_EXC_IP_SELECTIVE();
mp_obj_t index = POP();
SET_TOP(mp_obj_subscr(TOP(), index, MP_OBJ_SENTINEL));
DISPATCH();
}
ENTRY(MP_BC_STORE_FAST_N): {
DECODE_UINT;
fastn[-unum] = POP();
DISPATCH();
}
ENTRY(MP_BC_STORE_DEREF): {
DECODE_UINT;
mp_obj_cell_set(fastn[-unum], POP());
DISPATCH();
}
ENTRY(MP_BC_STORE_NAME): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_store_name(qst, POP());
DISPATCH();
}
ENTRY(MP_BC_STORE_GLOBAL): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_store_global(qst, POP());
DISPATCH();
}
#if !MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
ENTRY(MP_BC_STORE_ATTR): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_store_attr(sp[0], qst, sp[-1]);
sp -= 2;
DISPATCH();
}
#else
// This caching code works with MICROPY_PY_BUILTINS_PROPERTY and/or
// MICROPY_PY_DESCRIPTORS enabled because if the attr exists in
// self->members then it can't be a property or have descriptors. A
// consequence of this is that we can't use MP_MAP_LOOKUP_ADD_IF_NOT_FOUND
// in the fast-path below, because that store could override a property.
ENTRY(MP_BC_STORE_ATTR): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t top = TOP();
if (mp_obj_get_type(top)->attr == mp_obj_instance_attr && sp[-1] != MP_OBJ_NULL) {
mp_obj_instance_t *self = MP_OBJ_TO_PTR(top);
mp_uint_t x = *ip;
mp_obj_t key = MP_OBJ_NEW_QSTR(qst);
mp_map_elem_t *elem;
if (x < self->members.alloc && self->members.table[x].key == key) {
elem = &self->members.table[x];
} else {
elem = mp_map_lookup(&self->members, key, MP_MAP_LOOKUP);
if (elem != NULL) {
*(byte*)ip = elem - &self->members.table[0];
} else {
goto store_attr_cache_fail;
}
}
elem->value = sp[-1];
sp -= 2;
ip++;
DISPATCH();
}
store_attr_cache_fail:
mp_store_attr(sp[0], qst, sp[-1]);
sp -= 2;
ip++;
DISPATCH();
}
#endif
ENTRY(MP_BC_STORE_SUBSCR):
MARK_EXC_IP_SELECTIVE();
mp_obj_subscr(sp[-1], sp[0], sp[-2]);
sp -= 3;
DISPATCH();
ENTRY(MP_BC_DELETE_FAST): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
if (fastn[-unum] == MP_OBJ_NULL) {
goto local_name_error;
}
fastn[-unum] = MP_OBJ_NULL;
DISPATCH();
}
ENTRY(MP_BC_DELETE_DEREF): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
if (mp_obj_cell_get(fastn[-unum]) == MP_OBJ_NULL) {
goto local_name_error;
}
mp_obj_cell_set(fastn[-unum], MP_OBJ_NULL);
DISPATCH();
}
ENTRY(MP_BC_DELETE_NAME): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_delete_name(qst);
DISPATCH();
}
ENTRY(MP_BC_DELETE_GLOBAL): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_delete_global(qst);
DISPATCH();
}
ENTRY(MP_BC_DUP_TOP): {
mp_obj_t top = TOP();
PUSH(top);
DISPATCH();
}
ENTRY(MP_BC_DUP_TOP_TWO):
sp += 2;
sp[0] = sp[-2];
sp[-1] = sp[-3];
DISPATCH();
ENTRY(MP_BC_POP_TOP):
sp -= 1;
DISPATCH();
ENTRY(MP_BC_ROT_TWO): {
mp_obj_t top = sp[0];
sp[0] = sp[-1];
sp[-1] = top;
DISPATCH();
}
ENTRY(MP_BC_ROT_THREE): {
mp_obj_t top = sp[0];
sp[0] = sp[-1];
sp[-1] = sp[-2];
sp[-2] = top;
DISPATCH();
}
ENTRY(MP_BC_JUMP): {
DECODE_SLABEL;
ip += slab;
DISPATCH_WITH_PEND_EXC_CHECK();
}
ENTRY(MP_BC_POP_JUMP_IF_TRUE): {
DECODE_SLABEL;
if (mp_obj_is_true(POP())) {
ip += slab;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}
ENTRY(MP_BC_POP_JUMP_IF_FALSE): {
DECODE_SLABEL;
if (!mp_obj_is_true(POP())) {
ip += slab;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}
ENTRY(MP_BC_JUMP_IF_TRUE_OR_POP): {
DECODE_SLABEL;
if (mp_obj_is_true(TOP())) {
ip += slab;
} else {
sp--;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}
ENTRY(MP_BC_JUMP_IF_FALSE_OR_POP): {
DECODE_SLABEL;
if (mp_obj_is_true(TOP())) {
sp--;
} else {
ip += slab;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}
ENTRY(MP_BC_SETUP_WITH): {
MARK_EXC_IP_SELECTIVE();
// stack: (..., ctx_mgr)
mp_obj_t obj = TOP();
mp_load_method(obj, MP_QSTR___exit__, sp);
mp_load_method(obj, MP_QSTR___enter__, sp + 2);
mp_obj_t ret = mp_call_method_n_kw(0, 0, sp + 2);
sp += 1;
PUSH_EXC_BLOCK(1);
PUSH(ret);
// stack: (..., __exit__, ctx_mgr, as_value)
DISPATCH();
}
ENTRY(MP_BC_WITH_CLEANUP): {
MARK_EXC_IP_SELECTIVE();
// Arriving here, there's "exception control block" on top of stack,
// and __exit__ method (with self) underneath it. Bytecode calls __exit__,
// and "deletes" it off stack, shifting "exception control block"
// to its place.
// The bytecode emitter ensures that there is enough space on the Python
// value stack to hold the __exit__ method plus an additional 4 entries.
if (TOP() == mp_const_none) {
// stack: (..., __exit__, ctx_mgr, None)
sp[1] = mp_const_none;
sp[2] = mp_const_none;
sp -= 2;
mp_call_method_n_kw(3, 0, sp);
SET_TOP(mp_const_none);
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
mp_int_t cause_val = MP_OBJ_SMALL_INT_VALUE(TOP());
if (cause_val == UNWIND_RETURN) {
// stack: (..., __exit__, ctx_mgr, ret_val, UNWIND_RETURN)
mp_obj_t ret_val = sp[-1];
sp[-1] = mp_const_none;
sp[0] = mp_const_none;
sp[1] = mp_const_none;
mp_call_method_n_kw(3, 0, sp - 3);
sp[-3] = ret_val;
sp[-2] = MP_OBJ_NEW_SMALL_INT(UNWIND_RETURN);
} else {
assert(cause_val == UNWIND_JUMP);
// stack: (..., __exit__, ctx_mgr, dest_ip, num_exc, UNWIND_JUMP)
mp_obj_t dest_ip = sp[-2];
mp_obj_t num_exc = sp[-1];
sp[-2] = mp_const_none;
sp[-1] = mp_const_none;
sp[0] = mp_const_none;
mp_call_method_n_kw(3, 0, sp - 4);
sp[-4] = dest_ip;
sp[-3] = num_exc;
sp[-2] = MP_OBJ_NEW_SMALL_INT(UNWIND_JUMP);
}
sp -= 2; // we removed (__exit__, ctx_mgr)
} else {
assert(mp_obj_is_exception_instance(TOP()));
// stack: (..., __exit__, ctx_mgr, exc_instance)
// Need to pass (exc_type, exc_instance, None) as arguments to __exit__.
sp[1] = sp[0];
sp[0] = MP_OBJ_FROM_PTR(mp_obj_get_type(sp[0]));
sp[2] = mp_const_none;
sp -= 2;
mp_obj_t ret_value = mp_call_method_n_kw(3, 0, sp);
if (mp_obj_is_true(ret_value)) {
// We need to silence/swallow the exception. This is done
// by popping the exception and the __exit__ handler and
// replacing it with None, which signals END_FINALLY to just
// execute the finally handler normally.
SET_TOP(mp_const_none);
assert(exc_sp >= exc_stack);
POP_EXC_BLOCK();
} else {
// We need to re-raise the exception. We pop __exit__ handler
// by copying the exception instance down to the new top-of-stack.
sp[0] = sp[3];
}
}
DISPATCH();
}
ENTRY(MP_BC_UNWIND_JUMP): {
MARK_EXC_IP_SELECTIVE();
DECODE_SLABEL;
PUSH((mp_obj_t)(mp_uint_t)(uintptr_t)(ip + slab)); // push destination ip for jump
PUSH((mp_obj_t)(mp_uint_t)(*ip)); // push number of exception handlers to unwind (0x80 bit set if we also need to pop stack)
unwind_jump:;
mp_uint_t unum = (mp_uint_t)POP(); // get number of exception handlers to unwind
while ((unum & 0x7f) > 0) {
unum -= 1;
assert(exc_sp >= exc_stack);
if (MP_TAGPTR_TAG1(exc_sp->val_sp)) {
// Getting here the stack looks like:
// (..., X, dest_ip)
// where X is pointed to by exc_sp->val_sp and in the case
// of a "with" block contains the context manager info.
// We're going to run "finally" code as a coroutine
// (not calling it recursively). Set up a sentinel
// on a stack so it can return back to us when it is
// done (when WITH_CLEANUP or END_FINALLY reached).
PUSH((mp_obj_t)unum); // push number of exception handlers left to unwind
PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_JUMP)); // push sentinel
ip = exc_sp->handler; // get exception handler byte code address
exc_sp--; // pop exception handler
goto dispatch_loop; // run the exception handler
}
POP_EXC_BLOCK();
}
ip = (const byte*)MP_OBJ_TO_PTR(POP()); // pop destination ip for jump
if (unum != 0) {
// pop iter and iter_buf
sp--;
sp -= MP_OBJ_ITER_BUF_NSLOTS;
}
DISPATCH_WITH_PEND_EXC_CHECK();
}
// matched against: POP_BLOCK or POP_EXCEPT (anything else?)
ENTRY(MP_BC_SETUP_EXCEPT):
ENTRY(MP_BC_SETUP_FINALLY): {
MARK_EXC_IP_SELECTIVE();
#if SELECTIVE_EXC_IP
PUSH_EXC_BLOCK((code_state->ip[-1] == MP_BC_SETUP_FINALLY) ? 1 : 0);
#else
PUSH_EXC_BLOCK((code_state->ip[0] == MP_BC_SETUP_FINALLY) ? 1 : 0);
#endif
DISPATCH();
}
ENTRY(MP_BC_END_FINALLY):
MARK_EXC_IP_SELECTIVE();
// if TOS is None, just pops it and continues
// if TOS is an integer, finishes coroutine and returns control to caller
// if TOS is an exception, reraises the exception
if (TOP() == mp_const_none) {
sp--;
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
// We finished "finally" coroutine and now dispatch back
// to our caller, based on TOS value
mp_unwind_reason_t reason = MP_OBJ_SMALL_INT_VALUE(POP());
if (reason == UNWIND_RETURN) {
goto unwind_return;
} else {
assert(reason == UNWIND_JUMP);
goto unwind_jump;
}
} else {
assert(mp_obj_is_exception_instance(TOP()));
RAISE(TOP());
}
DISPATCH();
ENTRY(MP_BC_GET_ITER):
MARK_EXC_IP_SELECTIVE();
SET_TOP(mp_getiter(TOP(), NULL));
DISPATCH();
// An iterator for a for-loop takes MP_OBJ_ITER_BUF_NSLOTS slots on
// the Python value stack. These slots are either used to store the
// iterator object itself, or the first slot is MP_OBJ_NULL and
// the second slot holds a reference to the iterator object.
ENTRY(MP_BC_GET_ITER_STACK): {
MARK_EXC_IP_SELECTIVE();
mp_obj_t obj = TOP();
mp_obj_iter_buf_t *iter_buf = (mp_obj_iter_buf_t*)sp;
sp += MP_OBJ_ITER_BUF_NSLOTS - 1;
obj = mp_getiter(obj, iter_buf);
if (obj != MP_OBJ_FROM_PTR(iter_buf)) {
// Iterator didn't use the stack so indicate that with MP_OBJ_NULL.
sp[-MP_OBJ_ITER_BUF_NSLOTS + 1] = MP_OBJ_NULL;
sp[-MP_OBJ_ITER_BUF_NSLOTS + 2] = obj;
}
DISPATCH();
}
ENTRY(MP_BC_FOR_ITER): {
MARK_EXC_IP_SELECTIVE();
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
code_state->sp = sp;
mp_obj_t obj;
if (sp[-MP_OBJ_ITER_BUF_NSLOTS + 1] == MP_OBJ_NULL) {
obj = sp[-MP_OBJ_ITER_BUF_NSLOTS + 2];
} else {
obj = MP_OBJ_FROM_PTR(&sp[-MP_OBJ_ITER_BUF_NSLOTS + 1]);
}
mp_obj_t value = mp_iternext_allow_raise(obj);
if (value == MP_OBJ_STOP_ITERATION) {
sp -= MP_OBJ_ITER_BUF_NSLOTS; // pop the exhausted iterator
ip += ulab; // jump to after for-block
} else {
PUSH(value); // push the next iteration value
}
DISPATCH();
}
// matched against: SETUP_EXCEPT, SETUP_FINALLY, SETUP_WITH
ENTRY(MP_BC_POP_BLOCK):
// we are exiting an exception handler, so pop the last one of the exception-stack
assert(exc_sp >= exc_stack);
POP_EXC_BLOCK();
DISPATCH();
// matched against: SETUP_EXCEPT
ENTRY(MP_BC_POP_EXCEPT):
assert(exc_sp >= exc_stack);
assert(currently_in_except_block);
POP_EXC_BLOCK();
DISPATCH();
ENTRY(MP_BC_BUILD_TUPLE): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
sp -= unum - 1;
SET_TOP(mp_obj_new_tuple(unum, sp));
DISPATCH();
}
ENTRY(MP_BC_BUILD_LIST): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
sp -= unum - 1;
SET_TOP(mp_obj_new_list(unum, sp));
DISPATCH();
}
ENTRY(MP_BC_BUILD_MAP): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
PUSH(mp_obj_new_dict(unum));
DISPATCH();
}
ENTRY(MP_BC_STORE_MAP):
MARK_EXC_IP_SELECTIVE();
sp -= 2;
mp_obj_dict_store(sp[0], sp[2], sp[1]);
DISPATCH();
#if MICROPY_PY_BUILTINS_SET
ENTRY(MP_BC_BUILD_SET): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
sp -= unum - 1;
SET_TOP(mp_obj_new_set(unum, sp));
DISPATCH();
}
#endif
#if MICROPY_PY_BUILTINS_SLICE
ENTRY(MP_BC_BUILD_SLICE): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
if (unum == 2) {
mp_obj_t stop = POP();
mp_obj_t start = TOP();
SET_TOP(mp_obj_new_slice(start, stop, mp_const_none));
} else {
mp_obj_t step = POP();
mp_obj_t stop = POP();
mp_obj_t start = TOP();
SET_TOP(mp_obj_new_slice(start, stop, step));
}
DISPATCH();
}
#endif
ENTRY(MP_BC_STORE_COMP): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
mp_obj_t obj = sp[-(unum >> 2)];
if ((unum & 3) == 0) {
mp_obj_list_append(obj, sp[0]);
sp--;
} else if (!MICROPY_PY_BUILTINS_SET || (unum & 3) == 1) {
mp_obj_dict_store(obj, sp[0], sp[-1]);
sp -= 2;
#if MICROPY_PY_BUILTINS_SET
} else {
mp_obj_set_store(obj, sp[0]);
sp--;
#endif
}
DISPATCH();
}
ENTRY(MP_BC_UNPACK_SEQUENCE): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
mp_unpack_sequence(sp[0], unum, sp);
sp += unum - 1;
DISPATCH();
}
ENTRY(MP_BC_UNPACK_EX): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
mp_unpack_ex(sp[0], unum, sp);
sp += (unum & 0xff) + ((unum >> 8) & 0xff);
DISPATCH();
}
ENTRY(MP_BC_MAKE_FUNCTION): {
DECODE_PTR;
PUSH(mp_make_function_from_raw_code(ptr, MP_OBJ_NULL, MP_OBJ_NULL));
DISPATCH();
}
ENTRY(MP_BC_MAKE_FUNCTION_DEFARGS): {
DECODE_PTR;
// Stack layout: def_tuple def_dict <- TOS
mp_obj_t def_dict = POP();
SET_TOP(mp_make_function_from_raw_code(ptr, TOP(), def_dict));
DISPATCH();
}
ENTRY(MP_BC_MAKE_CLOSURE): {
DECODE_PTR;
size_t n_closed_over = *ip++;
// Stack layout: closed_overs <- TOS
sp -= n_closed_over - 1;
SET_TOP(mp_make_closure_from_raw_code(ptr, n_closed_over, sp));
DISPATCH();
}
ENTRY(MP_BC_MAKE_CLOSURE_DEFARGS): {
DECODE_PTR;
size_t n_closed_over = *ip++;
// Stack layout: def_tuple def_dict closed_overs <- TOS
sp -= 2 + n_closed_over - 1;
SET_TOP(mp_make_closure_from_raw_code(ptr, 0x100 | n_closed_over, sp));
DISPATCH();
}
ENTRY(MP_BC_CALL_FUNCTION): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
// unum & 0xff == n_positional
// (unum >> 8) & 0xff == n_keyword
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe);
#if MICROPY_STACKLESS
if (mp_obj_get_type(*sp) == &mp_type_fun_bc) {
code_state->ip = ip;
code_state->sp = sp;
code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1);
if (new_state) {
new_state->prev = code_state;
code_state = new_state;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
deep_recursion_error:
mp_exc_recursion_depth();
}
#endif
}
#endif
SET_TOP(mp_call_function_n_kw(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1));
DISPATCH();
}
ENTRY(MP_BC_CALL_FUNCTION_VAR_KW): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
// unum & 0xff == n_positional
// (unum >> 8) & 0xff == n_keyword
// We have folowing stack layout here:
// fun arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 2;
#if MICROPY_STACKLESS
if (mp_obj_get_type(*sp) == &mp_type_fun_bc) {
code_state->ip = ip;
code_state->sp = sp;
code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
mp_call_args_t out_args;
mp_call_prepare_args_n_kw_var(false, unum, sp, &out_args);
mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
out_args.n_args, out_args.n_kw, out_args.args);
m_del(mp_obj_t, out_args.args, out_args.n_alloc);
if (new_state) {
new_state->prev = code_state;
code_state = new_state;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw_var(false, unum, sp));
DISPATCH();
}
ENTRY(MP_BC_CALL_METHOD): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
// unum & 0xff == n_positional
// (unum >> 8) & 0xff == n_keyword
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 1;
#if MICROPY_STACKLESS
if (mp_obj_get_type(*sp) == &mp_type_fun_bc) {
code_state->ip = ip;
code_state->sp = sp;
code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
size_t n_args = unum & 0xff;
size_t n_kw = (unum >> 8) & 0xff;
int adjust = (sp[1] == MP_OBJ_NULL) ? 0 : 1;
mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(*sp, n_args + adjust, n_kw, sp + 2 - adjust);
if (new_state) {
new_state->prev = code_state;
code_state = new_state;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw(unum & 0xff, (unum >> 8) & 0xff, sp));
DISPATCH();
}
ENTRY(MP_BC_CALL_METHOD_VAR_KW): {
MARK_EXC_IP_SELECTIVE();
DECODE_UINT;
// unum & 0xff == n_positional
// (unum >> 8) & 0xff == n_keyword
// We have folowing stack layout here:
// fun self arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 3;
#if MICROPY_STACKLESS
if (mp_obj_get_type(*sp) == &mp_type_fun_bc) {
code_state->ip = ip;
code_state->sp = sp;
code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
mp_call_args_t out_args;
mp_call_prepare_args_n_kw_var(true, unum, sp, &out_args);
mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
out_args.n_args, out_args.n_kw, out_args.args);
m_del(mp_obj_t, out_args.args, out_args.n_alloc);
if (new_state) {
new_state->prev = code_state;
code_state = new_state;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw_var(true, unum, sp));
DISPATCH();
}
ENTRY(MP_BC_RETURN_VALUE):
MARK_EXC_IP_SELECTIVE();
// These next 3 lines pop a try-finally exception handler, if one
// is there on the exception stack. Without this the finally block
// is executed a second time when the return is executed, because
// the try-finally exception handler is still on the stack.
// TODO Possibly find a better way to handle this case.
if (currently_in_except_block) {
POP_EXC_BLOCK();
}
unwind_return:
while (exc_sp >= exc_stack) {
if (MP_TAGPTR_TAG1(exc_sp->val_sp)) {
// Getting here the stack looks like:
// (..., X, [iter0, iter1, ...,] ret_val)
// where X is pointed to by exc_sp->val_sp and in the case
// of a "with" block contains the context manager info.
// There may be 0 or more for-iterators between X and the
// return value, and these must be removed before control can
// pass to the finally code. We simply copy the ret_value down
// over these iterators, if they exist. If they don't then the
// following is a null operation.
mp_obj_t *finally_sp = MP_TAGPTR_PTR(exc_sp->val_sp);
finally_sp[1] = sp[0];
sp = &finally_sp[1];
// We're going to run "finally" code as a coroutine
// (not calling it recursively). Set up a sentinel
// on a stack so it can return back to us when it is
// done (when WITH_CLEANUP or END_FINALLY reached).
PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_RETURN));
ip = exc_sp->handler;
exc_sp--;
goto dispatch_loop;
}
exc_sp--;
}
nlr_pop();
code_state->sp = sp;
assert(exc_sp == exc_stack - 1);
MICROPY_VM_HOOK_RETURN
#if MICROPY_STACKLESS
if (code_state->prev != NULL) {
mp_obj_t res = *sp;
mp_globals_set(code_state->old_globals);
code_state = code_state->prev;
*code_state->sp = res;
goto run_code_state;
}
#endif
return MP_VM_RETURN_NORMAL;
ENTRY(MP_BC_RAISE_VARARGS): {
MARK_EXC_IP_SELECTIVE();
mp_uint_t unum = *ip++;
mp_obj_t obj;
if (unum == 2) {
mp_warning("exception chaining not supported");
// ignore (pop) "from" argument
sp--;
}
if (unum == 0) {
// search for the inner-most previous exception, to reraise it
obj = MP_OBJ_NULL;
for (mp_exc_stack_t *e = exc_sp; e >= exc_stack; e--) {
if (e->prev_exc != NULL) {
obj = MP_OBJ_FROM_PTR(e->prev_exc);
break;
}
}
if (obj == MP_OBJ_NULL) {
obj = mp_obj_new_exception_msg(&mp_type_RuntimeError, "No active exception to reraise");
RAISE(obj);
}
} else {
obj = POP();
}
obj = mp_make_raise_obj(obj);
RAISE(obj);
}
ENTRY(MP_BC_YIELD_VALUE):
yield:
nlr_pop();
code_state->ip = ip;
code_state->sp = sp;
code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
return MP_VM_RETURN_YIELD;
ENTRY(MP_BC_YIELD_FROM): {
MARK_EXC_IP_SELECTIVE();
//#define EXC_MATCH(exc, type) MP_OBJ_IS_TYPE(exc, type)
#define EXC_MATCH(exc, type) mp_obj_exception_match(exc, type)
#define GENERATOR_EXIT_IF_NEEDED(t) if (t != MP_OBJ_NULL && EXC_MATCH(t, MP_OBJ_FROM_PTR(&mp_type_GeneratorExit))) { RAISE(t); }
mp_vm_return_kind_t ret_kind;
mp_obj_t send_value = POP();
mp_obj_t t_exc = MP_OBJ_NULL;
mp_obj_t ret_value;
if (inject_exc != MP_OBJ_NULL) {
t_exc = inject_exc;
inject_exc = MP_OBJ_NULL;
ret_kind = mp_resume(TOP(), MP_OBJ_NULL, t_exc, &ret_value);
} else {
ret_kind = mp_resume(TOP(), send_value, MP_OBJ_NULL, &ret_value);
}
if (ret_kind == MP_VM_RETURN_YIELD) {
ip--;
PUSH(ret_value);
goto yield;
}
if (ret_kind == MP_VM_RETURN_NORMAL) {
// Pop exhausted gen
sp--;
// TODO: When ret_value can be MP_OBJ_NULL here??
if (ret_value == MP_OBJ_NULL || ret_value == MP_OBJ_STOP_ITERATION) {
// Optimize StopIteration
// TODO: get StopIteration's value
PUSH(mp_const_none);
} else {
PUSH(ret_value);
}
// If we injected GeneratorExit downstream, then even
// if it was swallowed, we re-raise GeneratorExit
GENERATOR_EXIT_IF_NEEDED(t_exc);
DISPATCH();
}
if (ret_kind == MP_VM_RETURN_EXCEPTION) {
// Pop exhausted gen
sp--;
if (EXC_MATCH(ret_value, MP_OBJ_FROM_PTR(&mp_type_StopIteration))) {
PUSH(mp_obj_exception_get_value(ret_value));
// If we injected GeneratorExit downstream, then even
// if it was swallowed, we re-raise GeneratorExit
GENERATOR_EXIT_IF_NEEDED(t_exc);
DISPATCH();
} else {
RAISE(ret_value);
}
}
}
ENTRY(MP_BC_IMPORT_NAME): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t obj = POP();
SET_TOP(mp_import_name(qst, obj, TOP()));
DISPATCH();
}
ENTRY(MP_BC_IMPORT_FROM): {
MARK_EXC_IP_SELECTIVE();
DECODE_QSTR;
mp_obj_t obj = mp_import_from(TOP(), qst);
PUSH(obj);
DISPATCH();
}
ENTRY(MP_BC_IMPORT_STAR):
MARK_EXC_IP_SELECTIVE();
mp_import_all(POP());
DISPATCH();
#if MICROPY_OPT_COMPUTED_GOTO
ENTRY(MP_BC_LOAD_CONST_SMALL_INT_MULTI):
PUSH(MP_OBJ_NEW_SMALL_INT((mp_int_t)ip[-1] - MP_BC_LOAD_CONST_SMALL_INT_MULTI - 16));
DISPATCH();
ENTRY(MP_BC_LOAD_FAST_MULTI):
obj_shared = fastn[MP_BC_LOAD_FAST_MULTI - (mp_int_t)ip[-1]];
goto load_check;
ENTRY(MP_BC_STORE_FAST_MULTI):
fastn[MP_BC_STORE_FAST_MULTI - (mp_int_t)ip[-1]] = POP();
DISPATCH();
ENTRY(MP_BC_UNARY_OP_MULTI):
MARK_EXC_IP_SELECTIVE();
SET_TOP(mp_unary_op(ip[-1] - MP_BC_UNARY_OP_MULTI, TOP()));
DISPATCH();
ENTRY(MP_BC_BINARY_OP_MULTI): {
MARK_EXC_IP_SELECTIVE();
mp_obj_t rhs = POP();
mp_obj_t lhs = TOP();
SET_TOP(mp_binary_op(ip[-1] - MP_BC_BINARY_OP_MULTI, lhs, rhs));
DISPATCH();
}
ENTRY_DEFAULT:
MARK_EXC_IP_SELECTIVE();
#else
ENTRY_DEFAULT:
if (ip[-1] < MP_BC_LOAD_CONST_SMALL_INT_MULTI + 64) {
PUSH(MP_OBJ_NEW_SMALL_INT((mp_int_t)ip[-1] - MP_BC_LOAD_CONST_SMALL_INT_MULTI - 16));
DISPATCH();
} else if (ip[-1] < MP_BC_LOAD_FAST_MULTI + 16) {
obj_shared = fastn[MP_BC_LOAD_FAST_MULTI - (mp_int_t)ip[-1]];
goto load_check;
} else if (ip[-1] < MP_BC_STORE_FAST_MULTI + 16) {
fastn[MP_BC_STORE_FAST_MULTI - (mp_int_t)ip[-1]] = POP();
DISPATCH();
} else if (ip[-1] < MP_BC_UNARY_OP_MULTI + 7) {
SET_TOP(mp_unary_op(ip[-1] - MP_BC_UNARY_OP_MULTI, TOP()));
DISPATCH();
} else if (ip[-1] < MP_BC_BINARY_OP_MULTI + 36) {
mp_obj_t rhs = POP();
mp_obj_t lhs = TOP();
SET_TOP(mp_binary_op(ip[-1] - MP_BC_BINARY_OP_MULTI, lhs, rhs));
DISPATCH();
} else
#endif
{
mp_obj_t obj = mp_obj_new_exception_msg(&mp_type_NotImplementedError, "byte code not implemented");
nlr_pop();
fastn[0] = obj;
return MP_VM_RETURN_EXCEPTION;
}
#if !MICROPY_OPT_COMPUTED_GOTO
} // switch
#endif
pending_exception_check:
MICROPY_VM_HOOK_LOOP
#if MICROPY_ENABLE_SCHEDULER
// This is an inlined variant of mp_handle_pending
if (MP_STATE_VM(sched_state) == MP_SCHED_PENDING) {
MARK_EXC_IP_SELECTIVE();
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
if (obj != MP_OBJ_NULL) {
MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
if (!mp_sched_num_pending()) {
MP_STATE_VM(sched_state) = MP_SCHED_IDLE;
}
MICROPY_END_ATOMIC_SECTION(atomic_state);
RAISE(obj);
}
mp_handle_pending_tail(atomic_state);
}
#else
// This is an inlined variant of mp_handle_pending
if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL) {
MARK_EXC_IP_SELECTIVE();
mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
RAISE(obj);
}
#endif
#if MICROPY_PY_THREAD_GIL
#if MICROPY_PY_THREAD_GIL_VM_DIVISOR
if (--gil_divisor == 0) {
gil_divisor = MICROPY_PY_THREAD_GIL_VM_DIVISOR;
#else
{
#endif
#if MICROPY_ENABLE_SCHEDULER
// can only switch threads if the scheduler is unlocked
if (MP_STATE_VM(sched_state) == MP_SCHED_IDLE)
#endif
{
MP_THREAD_GIL_EXIT();
MP_THREAD_GIL_ENTER();
}
}
#endif
} // for loop
} else {
exception_handler:
// exception occurred
#if MICROPY_PY_SYS_EXC_INFO
MP_STATE_VM(cur_exception) = nlr.ret_val;
#endif
#if SELECTIVE_EXC_IP
// with selective ip, we store the ip 1 byte past the opcode, so move ptr back
code_state->ip -= 1;
#endif
if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(((mp_obj_base_t*)nlr.ret_val)->type), MP_OBJ_FROM_PTR(&mp_type_StopIteration))) {
if (code_state->ip) {
// check if it's a StopIteration within a for block
if (*code_state->ip == MP_BC_FOR_ITER) {
const byte *ip = code_state->ip + 1;
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
code_state->ip = ip + ulab; // jump to after for-block
code_state->sp -= MP_OBJ_ITER_BUF_NSLOTS; // pop the exhausted iterator
goto outer_dispatch_loop; // continue with dispatch loop
} else if (*code_state->ip == MP_BC_YIELD_FROM) {
// StopIteration inside yield from call means return a value of
// yield from, so inject exception's value as yield from's result
*++code_state->sp = mp_obj_exception_get_value(MP_OBJ_FROM_PTR(nlr.ret_val));
code_state->ip++; // yield from is over, move to next instruction
goto outer_dispatch_loop; // continue with dispatch loop
}
}
}
#if MICROPY_STACKLESS
unwind_loop:
#endif
// set file and line number that the exception occurred at
// TODO: don't set traceback for exceptions re-raised by END_FINALLY.
// But consider how to handle nested exceptions.
// TODO need a better way of not adding traceback to constant objects (right now, just GeneratorExit_obj and MemoryError_obj)
if (nlr.ret_val != &mp_const_GeneratorExit_obj && nlr.ret_val != &mp_const_MemoryError_obj) {
const byte *ip = code_state->fun_bc->bytecode;
mp_decode_uint(&ip); // skip n_state
mp_decode_uint(&ip); // skip n_exc_stack
ip++; // skip scope_params
ip++; // skip n_pos_args
ip++; // skip n_kwonly_args
ip++; // skip n_def_pos_args
size_t bc = code_state->ip - ip;
size_t code_info_size = mp_decode_uint(&ip);
bc -= code_info_size;
#if MICROPY_PERSISTENT_CODE
qstr block_name = ip[0] | (ip[1] << 8);
qstr source_file = ip[2] | (ip[3] << 8);
ip += 4;
#else
qstr block_name = mp_decode_uint(&ip);
qstr source_file = mp_decode_uint(&ip);
#endif
size_t source_line = 1;
size_t c;
while ((c = *ip)) {
size_t b, l;
if ((c & 0x80) == 0) {
// 0b0LLBBBBB encoding
b = c & 0x1f;
l = c >> 5;
ip += 1;
} else {
// 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
b = c & 0xf;
l = ((c << 4) & 0x700) | ip[1];
ip += 2;
}
if (bc >= b) {
bc -= b;
source_line += l;
} else {
// found source line corresponding to bytecode offset
break;
}
}
mp_obj_exception_add_traceback(MP_OBJ_FROM_PTR(nlr.ret_val), source_file, source_line, block_name);
}
while (currently_in_except_block) {
// nested exception
assert(exc_sp >= exc_stack);
// TODO make a proper message for nested exception
// at the moment we are just raising the very last exception (the one that caused the nested exception)
// move up to previous exception handler
POP_EXC_BLOCK();
}
if (exc_sp >= exc_stack) {
// set flag to indicate that we are now handling an exception
currently_in_except_block = 1;
// catch exception and pass to byte code
code_state->ip = exc_sp->handler;
mp_obj_t *sp = MP_TAGPTR_PTR(exc_sp->val_sp);
// save this exception in the stack so it can be used in a reraise, if needed
exc_sp->prev_exc = nlr.ret_val;
// push exception object so it can be handled by bytecode
PUSH(MP_OBJ_FROM_PTR(nlr.ret_val));
code_state->sp = sp;
#if MICROPY_STACKLESS
} else if (code_state->prev != NULL) {
mp_globals_set(code_state->old_globals);
code_state = code_state->prev;
fastn = &code_state->state[n_state - 1];
exc_stack = (mp_exc_stack_t*)(code_state->state + n_state);
// variables that are visible to the exception handler (declared volatile)
currently_in_except_block = MP_TAGPTR_TAG0(code_state->exc_sp); // 0 or 1, to detect nested exceptions
exc_sp = MP_TAGPTR_PTR(code_state->exc_sp); // stack grows up, exc_sp points to top of stack
goto unwind_loop;
#endif
} else {
// propagate exception to higher level
// TODO what to do about ip and sp? they don't really make sense at this point
fastn[0] = MP_OBJ_FROM_PTR(nlr.ret_val); // must put exception here because sp is invalid
return MP_VM_RETURN_EXCEPTION;
}
}
}
}
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