diff options
Diffstat (limited to 'src/compile.c')
| -rw-r--r-- | src/compile.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/src/compile.c b/src/compile.c index 4276d3bf..a5c75c96 100644 --- a/src/compile.c +++ b/src/compile.c @@ -704,12 +704,27 @@ static block bind_matcher(block matcher, block body) { block gen_reduce(block source, block matcher, block init, block body) { block res_var = gen_op_var_fresh(STOREV, "reduce"); + block update_var = gen_op_bound(STOREV, res_var); + block jmp = gen_op_target(JUMP, body); block loop = BLOCK(gen_op_simple(DUPN), source, bind_matcher(matcher, BLOCK(gen_op_bound(LOADVN, res_var), + /* + * We fork to the body, jump to + * the STOREV. This means that + * if body produces no results + * (i.e., it just does empty) + * then we keep the current + * reduction state as-is. + * + * To break out of a + * reduction... use break. + */ + gen_op_target(FORK, jmp), + jmp, body, - gen_op_bound(STOREV, res_var))), + update_var)), gen_op_simple(BACKTRACK)); return BLOCK(gen_op_simple(DUP), init, |