Event-triggered coroutines live in two stages: 'uncommitted' and 'ready'. First
they land in 'uncommitted', meaning they can't be resumed yet. Only after
coroutines from the 'ready' queue are resumed, the 'uncommitted' ones are moved
to the 'ready' queue, and can be resumed. This is to avoid self-triggering in
situations like waiting for an event immediately after triggering it.
However, there is an issue with `wait` statements. If you have a `wait(b)`, it's
being translated into a loop that awaits a change in `b` as long as `b` is
false. If `b` is false at first, the coroutine is put into the `uncommitted`
queue. If `b` is set to true before it's committed, the coroutine won't get
resumed.
This patch fixes that by immediately committing event controls created from
`wait` statements. That means the coroutine from the example above will get
resumed from now on.
This makes the implementation of the detection and propagation of the
suspendable property simpler and easier to read. More importantly, there are no
more jumps around the AST with the `visit` functions, which in some cases could
result in incorrect visitor context while in the `visit` function. See the added
test, which would cause Verilator to segfault before this patch.
In testing, verilation performance was not shown to be affected by this change.
Though there is a slight performance improvement from this patch, due to adding
one more check before refreshing class member cache.
Signed-off-by: Krzysztof Bieganski <kbieganski@antmicro.com>
* V3Common.cpp::makeVlToString: fix `VL_TOSTRING_W` statement generation to include width argument
* fix contribution name
* add testcase for long struct `VL_TO_STRING_W` bug
This patch fixes two cases where methods in base classes were not being marked
as coroutines, even though they were being overridden by coroutines.
- One case is the class member cache not getting refreshed for searched classes.
- The other is when the overriding methods are not declared as `virtual`. In
that case, the `isVirtual()` getter on such a method returns false, which led
to `V3Timing` skipping the step of searching for overridden methods.
Signed-off-by: Krzysztof Bieganski <kbieganski@antmicro.com>
Static variables of functions are created in the function. When blocks
in a function use identical names for static variables, we need to name
those variables properly.
Pack the elements of VlTriggerVec as dense bits (instead of a 1 byte
bool per bit), and check whether they are set on a word granularity.
This effectively transforms conditions of the form `if (trig.at(0) |
trig.at(2) | trig.at(64))` into `if (trig.word(0) & 0x5 | trig.word(1) &
0x1)`. This improves OpenTitan ST by about 1%, worth more on some other
designs.
