num_gangs takes an 'int-expr-list', for 'parallel', and an 'int-expr'
for 'kernels'. This patch changes the parsing to always parse it as an
'int-expr-list', then correct the expression count during Sema. It also
implements the rest of the semantic analysis changes for this clause.
The 'vector_length' clause is semantically identical to the
'num_workers' clause, in that it takes a mandatory single int-expr. This
is implemented identically to it.
`self` clauses on compute constructs take an optional condition
expression. We again limit the implementation to ONLY compute constructs
to ensure we get all the rules correct for others. However, this one
will be particularly complicated, as it takes a `var-list` for `update`,
so when we get to that construct/clause combination, we need to do that
as well.
This patch also furthers uses of the `OpenACCClauses.def` as it became
useful while implementing this (as well as some other minor refactors as
I went through).
Finally, `self` and `if` clauses have an interaction with each other, if
an `if` clause evaluates to `true`, the `self` clause has no effect.
While this is intended and can be used 'meaningfully', we are warning on
this with a very granular warning, so that this edge case will be
noticed by newer users, but can be disabled trivially.
While working on a followup patch, it became clear that this extra bit
of 'OpenACC' before each clause name was redundant with the visitors, so
remove it to make this a little less verbose.
Like with the 'default' clause, this is being applied to only Compute
Constructs for now. The 'if' clause takes a condition expression which
is used as a runtime value.
This is not a particularly complex semantic implementation, as there
isn't much to this clause, other than its interactions with 'self',
which will be managed in the patch to implement that.
As a followup to my previous commits, this is an implementation of a
single clause, in this case the 'default' clause. This implements all
semantic analysis for it on compute clauses, and continues to leave it
rejected for all others (some as 'doesnt appertain', others as 'not
implemented' as appropriate).
This also implements and tests the TreeTransform as requested in the
previous patch.
As a first step in adding clause support for OpenACC to Semantic
Analysis, this patch adds the 'base' AST nodes required for clauses.
This patch has no functional effect at the moment, but followup patches
will add the semantic analysis of clauses (plus individual clauses).
