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py: Make sure state/stack of byte code function has at least 1 slot.

This commit is contained in:
Damien George 2014-04-10 16:59:56 +00:00
parent a1ef441d18
commit 190d1ba297
1 changed files with 6 additions and 0 deletions
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6
py/emitbc.c
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@ -232,6 +232,12 @@ STATIC void emit_bc_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
{ {
byte* c = emit_get_cur_to_write_byte_code(emit, 4); byte* c = emit_get_cur_to_write_byte_code(emit, 4);
uint n_state = scope->num_locals + scope->stack_size; uint n_state = scope->num_locals + scope->stack_size;
if (n_state == 0) {
// Need at least 1 entry in the state, in the case an exception is
// propagated through this function, the exception is returned in
// the highest slot in the state (fastn[0], see vm.c).
n_state = 1;
}
c[0] = n_state & 0xff; c[0] = n_state & 0xff;
c[1] = (n_state >> 8) & 0xff; c[1] = (n_state >> 8) & 0xff;
c[2] = scope->exc_stack_size & 0xff; c[2] = scope->exc_stack_size & 0xff;