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py: Don't allocate an extra parse node for power exponent. 

Previous to this patch, the "**b" in "a**b" had its own parse node with
just one item (the "b").  Now, the "b" is just the last element of the
power parse-node.  This saves (a tiny bit of) RAM when compiling.
This commit is contained in:
Damien George 2016-03-16 13:04:51 +00:00
parent 52e062ef33
commit 3acaa28b52
2 changed files with 5 additions and 6 deletions
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9
py/compile.c
View File

@ -1970,6 +1970,10 @@ STATIC void compile_power(compiler_t *comp, mp_parse_node_struct_t *pns) {
comp->func_arg_is_super = MP_PARSE_NODE_IS_ID(pns->nodes[0]) && MP_PARSE_NODE_LEAF_ARG(pns->nodes[0]) == MP_QSTR_super;
compile_generic_all_nodes(comp, pns);
if (!MP_PARSE_NODE_IS_NULL(pns->nodes[2])) {
EMIT_ARG(binary_op, MP_BINARY_OP_POWER);
}
}
STATIC void compile_trailer_paren_helper(compiler_t *comp, mp_parse_node_t pn_arglist, bool is_method_call, int n_positional_extra) {
@ -2087,11 +2091,6 @@ STATIC void compile_power_trailers(compiler_t *comp, mp_parse_node_struct_t *pns
}
}
STATIC void compile_power_dbl_star(compiler_t *comp, mp_parse_node_struct_t *pns) {
compile_node(comp, pns->nodes[0]);
EMIT_ARG(binary_op, MP_BINARY_OP_POWER);
}
STATIC void compile_atom_string(compiler_t *comp, mp_parse_node_struct_t *pns) {
// a list of strings

2
py/grammar.h
View File

@ -241,7 +241,7 @@ DEF_RULE(factor_2, c(factor_2), and(2), rule(factor_op), rule(factor))
DEF_RULE(factor_op, nc, or(3), tok(OP_PLUS), tok(OP_MINUS), tok(OP_TILDE))
DEF_RULE(power, c(power), and(3), rule(atom), opt_rule(power_trailers), opt_rule(power_dbl_star))
DEF_RULE(power_trailers, c(power_trailers), one_or_more, rule(trailer))
DEF_RULE(power_dbl_star, c(power_dbl_star), and(2), tok(OP_DBL_STAR), rule(factor))
DEF_RULE(power_dbl_star, nc, ident | and(2), tok(OP_DBL_STAR), rule(factor))
// atom: '(' [yield_expr|testlist_comp] ')' | '[' [testlist_comp] ']' | '{' [dictorsetmaker] '}' | NAME | NUMBER | STRING+ | '...' | 'None' | 'True' | 'False'
// testlist_comp: (test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )