diff options
Diffstat (limited to 'erts/emulator/beam/erl_bif_guard.c')
| -rw-r--r-- | erts/emulator/beam/erl_bif_guard.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_bif_guard.c b/erts/emulator/beam/erl_bif_guard.c index 8b47db10dd..9e15f4e399 100644 --- a/erts/emulator/beam/erl_bif_guard.c +++ b/erts/emulator/beam/erl_bif_guard.c @@ -318,6 +318,10 @@ double_to_integer(Process* p, double x) * The following code is used when a guard that may build on the * heap is called directly. They must not use HAlloc(), but must * do a garbage collection if there is insufficient heap space. + * + * Important note: All error checking MUST be done before doing + * a garbage collection. The compiler assumes that all registers + * are still valid if a guard BIF generates an exception. */ #define ERTS_NEED_GC(p, need) ((HEAP_LIMIT((p)) - HEAP_TOP((p))) <= (need)) |