diff options
Diffstat (limited to 'gcc/stmt.c')
| -rw-r--r-- | gcc/stmt.c | 37 |
1 files changed, 37 insertions, 0 deletions
@@ -2294,6 +2294,30 @@ expand_start_loop_continue_elsewhere (exit_flag) return thisloop; } +/* Begin a null, aka do { } while (0) "loop". But since the contents + of said loop can still contain a break, we must frob the loop nest. */ + +struct nesting * +expand_start_null_loop () +{ + register struct nesting *thisloop = ALLOC_NESTING (); + + /* Make an entry on loop_stack for the loop we are entering. */ + + thisloop->next = loop_stack; + thisloop->all = nesting_stack; + thisloop->depth = ++nesting_depth; + thisloop->data.loop.start_label = emit_note (NULL, NOTE_INSN_DELETED); + thisloop->data.loop.end_label = gen_label_rtx (); + thisloop->data.loop.alt_end_label = NULL_RTX; + thisloop->data.loop.continue_label = NULL_RTX; + thisloop->exit_label = thisloop->data.loop.end_label; + loop_stack = thisloop; + nesting_stack = thisloop; + + return thisloop; +} + /* Specify the continuation point for a loop started with expand_start_loop_continue_elsewhere. Use this at the point in the code to which a continue statement @@ -2620,6 +2644,19 @@ expand_end_loop () last_expr_type = 0; } +/* Finish a null loop, aka do { } while (0). */ + +void +expand_end_null_loop () +{ + do_pending_stack_adjust (); + emit_label (loop_stack->data.loop.end_label); + + POPSTACK (loop_stack); + + last_expr_type = 0; +} + /* Generate a jump to the current loop's continue-point. This is usually the top of the loop, but may be specified explicitly elsewhere. If not currently inside a loop, |