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py: Make FOR_ITER opcode pop 1+4 slots from the stack when finished.

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The extra 4 slots correspond to the iterator object stored on the stack.
This commit is contained in:
Damien George 2017-01-17 14:32:50 +11:00
parent f4df3aaa72
commit 6e769da0da
3 changed files with 12 additions and 11 deletions
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12
py/compile.c
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@ -2887,7 +2887,7 @@ STATIC void compile_scope_comp_iter(compiler_t *comp, mp_parse_node_struct_t *pn
EMIT(yield_value);
EMIT(pop_top);
} else {
EMIT_ARG(store_comp, comp->scope_cur->kind, for_depth + 2);
EMIT_ARG(store_comp, comp->scope_cur->kind, 5 * for_depth + 6);
}
} else if (MP_PARSE_NODE_IS_STRUCT_KIND(pn_iter, PN_comp_if)) {
// if condition
@ -2900,13 +2900,13 @@ STATIC void compile_scope_comp_iter(compiler_t *comp, mp_parse_node_struct_t *pn
// for loop
mp_parse_node_struct_t *pns_comp_for2 = (mp_parse_node_struct_t*)pn_iter;
compile_node(comp, pns_comp_for2->nodes[1]);
EMIT_ARG(get_iter, false);
EMIT_ARG(get_iter, true);
compile_scope_comp_iter(comp, pns_comp_for2, pn_inner_expr, for_depth + 1);
}
EMIT_ARG(jump, l_top);
EMIT_ARG(label_assign, l_end);
EMIT_ARG(for_iter_end, false);
EMIT_ARG(for_iter_end, true);
}
STATIC void check_for_doc_string(compiler_t *comp, mp_parse_node_t pn) {
@ -3070,6 +3070,12 @@ STATIC void compile_scope(compiler_t *comp, scope_t *scope, pass_kind_t pass) {
#endif
}
// dummy 4 objects
EMIT(load_null);
EMIT(load_null);
EMIT(load_null);
EMIT(load_null);
compile_load_id(comp, qstr_arg);
compile_scope_comp_iter(comp, pns_comp_for, pns->nodes[0], 0);

7
py/emitbc.c
View File

@ -788,12 +788,7 @@ void mp_emit_bc_for_iter(emit_t *emit, mp_uint_t label) {
}
void mp_emit_bc_for_iter_end(emit_t *emit, bool use_stack) {
emit_bc_pre(emit, -1);
if (use_stack) {
for (size_t i = 0; i < sizeof(mp_obj_iter_buf_t) / sizeof(mp_obj_t); ++i) {
mp_emit_bc_pop_top(emit);
}
}
emit_bc_pre(emit, use_stack ? -1 - sizeof(mp_obj_iter_buf_t) / sizeof(mp_obj_t) : -1);
}
void mp_emit_bc_pop_block(emit_t *emit) {

4
py/vm.c
View File

@ -744,7 +744,7 @@ unwind_jump:;
assert(TOP());
mp_obj_t value = mp_iternext_allow_raise(TOP());
if (value == MP_OBJ_STOP_ITERATION) {
--sp; // pop the exhausted iterator
sp -= 5; // pop the exhausted iterator
ip += ulab; // jump to after for-block
} else {
PUSH(value); // push the next iteration value
@ -1294,7 +1294,7 @@ exception_handler:
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
code_state->sp -= 5; // 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