813e48dc21
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 |
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| .. | ||
| common | ||
| evaluate | ||
| FIR | ||
| parser | ||
| semantics | ||
| CMakeLists.txt | ||