/* * 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 #include #include #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->sp)); mp_bytecode_print2(ip, 1, code_state->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 mp_uint_t ulab = (ip[0] | (ip[1] << 8)); ip += 2 #define DECODE_SLABEL mp_uint_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->const_table[unum] #define DECODE_OBJ \ DECODE_UINT; \ mp_obj_t obj = (mp_obj_t)code_state->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() mp_obj_t * /*const*/ fastn = &code_state->state[code_state->n_state - 1]; mp_exc_stack_t * /*const*/ exc_stack = (mp_exc_stack_t*)(code_state->state + code_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_STATE_CTX(dict_locals)->map.alloc && MP_STATE_CTX(dict_locals)->map.table[x].key == key) { PUSH(MP_STATE_CTX(dict_locals)->map.table[x].value); } else { mp_map_elem_t *elem = mp_map_lookup(&MP_STATE_CTX(dict_locals)->map, MP_OBJ_NEW_QSTR(qst), MP_MAP_LOOKUP); if (elem != NULL) { *(byte*)ip = (elem - &MP_STATE_CTX(dict_locals)->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_STATE_CTX(dict_globals)->map.alloc && MP_STATE_CTX(dict_globals)->map.table[x].key == key) { PUSH(MP_STATE_CTX(dict_globals)->map.table[x].value); } else { mp_map_elem_t *elem = mp_map_lookup(&MP_STATE_CTX(dict_globals)->map, MP_OBJ_NEW_QSTR(qst), MP_MAP_LOOKUP); if (elem != NULL) { *(byte*)ip = (elem - &MP_STATE_CTX(dict_globals)->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_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) { sp--; } 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())); 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; assert(TOP()); mp_obj_t value = mp_iternext_allow_raise(TOP()); if (value == MP_OBJ_STOP_ITERATION) { --sp; // 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; mp_uint_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; mp_uint_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); mp_uint_t n_args = unum & 0xff; mp_uint_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 (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); } #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 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 -= 1; // 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->code_info; mp_uint_t code_info_size = mp_decode_uint(&ip); #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 bc = code_state->ip - code_state->code_info - code_info_size; size_t source_line = 1; size_t c; while ((c = *ip)) { mp_uint_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[code_state->n_state - 1]; exc_stack = (mp_exc_stack_t*)(code_state->state + code_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; } } } }