Add the needed infrastructures that allow ephemeral classes (`PipeRun`s)
to be wrapped as a regular pypeline `Pipe` class. These automatically
have their dependencies tracked and propagated to the pypeline.
This commit a non-deterministic bug on ARM's switch-disjoint-ranges
test.
The problem was that we were setting as initial nodes of the monotone
framework all the nodes that are not reachable from the nodes classified
as initial nodes *so far*.
This approach is susceptible to the visit order.
Classifying certain nodes as entry nodes degrades the analysis results
since we associates a top value to them.
Electing initial nodes by traversing a list of nodes sorted by dominance
solves this problem.
"Smart" builders that create other attributes internally have turned out
to be more trouble than they're worth. It's simpler to just use the
default builders with the parameters that are actually needed for
initialising the type or attribute.
Drop the `MaterializeLoopScopes` pass after the re-design the loop
matching stage to work entirely on `clift`, without the need to insert a
`scope_closer` edge to guide the emission.
Simultaneously, drop the DAGify `Head` metadata insertion, since it will
not be checked anymore during the `MaterializeLoopScopes` pass.
We now ensure that even in case of blocks disconnected from the entry,
the `isDAG` function still search for loops in such parts of the graph.
This is achieved by instantiating multiple `scc_iterator` on the blocks
composing the underlying `Graph`.
During the `Head` election phase, we now introduce the following
additional criterion:
When processing a `GenericRegion` nested into an outer one (its
`ParentRegion`), if the inner `Region` contains the block that has been
elected as `Head` of the `ParentRegion`, we also force that block to be
the `Head` of the inner `GenericRegion`.
We add a unit test to check this behavior.
The `check-conventions` script inadvertently ignored checking the
license header in `CMakeLists.txt`. Change the script so that those are
checked. Also add the missing headers to the reported files.
Ivan Krysak