Add `SemanticsVisitor` as the visitor class to perform statement
semantics checks. Its template parameters are "checker" classes
that perform the checks. They have `Enter` and `Leave` functions
that are called for the corresponding parse tree nodes (`Enter`
before the children, `Leave` after). Unlike `Pre` and `Post` in
visitors they cannot prevent the parse tree walker from visiting
child nodes.
Existing checks have been incorporated into this framework:
- `ExprChecker` replaces `AnalyzeExpressions()`
- `AssignmentChecker` replaces `AnalyzeAssignments()`
- `DoConcurrentChecker` replaces `CheckDoConcurrentConstraints()`
Adding a new checker requires:
- defining the checker class:
- with BaseChecker as virtual base class
- constructible from `SemanticsContext`
- with Enter/Leave functions for nodes of interest
- add the checker class to the template parameters of `StatementSemantics`
Because these checkers and also `ResolveNamesVisitor` require tracking
the current statement source location, that has been moved into
`SemanticsContext`. `ResolveNamesVisitor` and `SemanticsVisitor`
update the location when `Statement` nodes are encountered, making it
available for error messages.
`AnalyzeKindSelector()` now has access to the current statement through
the context and so no longer needs to have it passed in.
Test `assign01.f90` was added to verify that `AssignmentChecker` is
actually doing something.
Original-commit: flang-compiler/f18@3a222c3673
Reviewed-on: https://github.com/flang-compiler/f18/pull/315
Tree-same-pre-rewrite: false
remove needless template<> on some function overloads
dodge bogus compiler warning from gcc 8.1.0 only
stricter typing of expressions in symbols
adjust modfile12.f90 expected test results
add Unwrap, massage folding a bit
Use Unwrap to simplify folding
Move KindSelector analysis into expression semantics
fix crash
checkpoint
updates to TypeParamInquiry
support of %KIND type parameter inquiry
equality testing for expressions
checkpoint during PDT implementation
reformat
checkpoint derived type instantiation
checkpoint
resolve merge
debugging failed tests
fix failing resolve37.f90 test
all existing tests pass
clean up all build warnings
fix bug
update copyright dates
fix copyright dates
address review comments
review comment
merge with master after peeling off changes
bugfixing new feature
fix warning from old g++s
tweaks after merging with latest head
more bugfixing
making modfile17.f90 test work
Make kinds into expressions in symbol table types
big refactor for deferring kinds in intrinsic types
modfile17.f90 test passes
clean up TODOs
Simplify types as stored in scopes
Test KIND parameter default init expressions, debug them
Update copyright dates
address comments
remove dead line
address comments
Original-commit: flang-compiler/f18@1f43d0a048
Reviewed-on: https://github.com/flang-compiler/f18/pull/260
Tree-same-pre-rewrite: false
