diff options
Diffstat (limited to 'docs/users_guide/debugging.xml')
| -rw-r--r-- | docs/users_guide/debugging.xml | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/users_guide/debugging.xml b/docs/users_guide/debugging.xml index aebb928ae8..3d820d65c5 100644 --- a/docs/users_guide/debugging.xml +++ b/docs/users_guide/debugging.xml @@ -423,7 +423,15 @@ <indexterm><primary><option>-dshow-passes</option></primary></indexterm> </term> <listitem> - <para>Print out each pass name as it happens.</para> + <para>Print out each pass name, its runtime and heap allocations as it happens. + Note that this may come at a slight performance cost as the compiler will + be a bit more eager in forcing pass results to more accurately account for + their costs. + + Two types of messages are produced: Those beginning with ``***`` are + denote the beginning of a compilation phase whereas those starting with + ``!!!`` mark the end of a pass and are accompanied by allocation and + runtime statistics.</para> </listitem> </varlistentry> |