[PATCH] D118589: [C++20][Modules] Record direct module imports.

[Iain Sandoe via Phabricator via cfe-commits]

iains created this revision.
iains updated this revision to Diff 404485.
iains added a comment.
iains updated this revision to Diff 405596.
iains updated this revision to Diff 408764.
iains added reviewers: rsmith, urnathan, ChuanqiXu.
iains published this revision for review.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Rebased onto dependent patch after changes


iains added a comment.

rebased onto import state machine.


iains added a comment.

Rebased onto other modules work.


iains added a comment.

patch 6 of 8 to implement basic C++20 module partition support.


This is a small cache to avoid having to check both Exports and
Imports.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118589

Files:
  clang/include/clang/Sema/Sema.h
  clang/lib/Sema/SemaModule.cpp


Index: clang/lib/Sema/SemaModule.cpp
===================================================================
--- clang/lib/Sema/SemaModule.cpp
+++ clang/lib/Sema/SemaModule.cpp
@@ -507,6 +507,11 @@
     assert (ThisModule && "was expecting a module if building one");
   }
 
+  // In some cases we need to know if an entity was present in a directly-
+  // imported module (as opposed to a transitive import).  This avoids
+  // searching both Imports and Exports.
+  DirectModuleImports.insert(Mod);
+
   return Import;
 }
 
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -2222,6 +2222,9 @@
   /// The global module fragment of the current translation unit.
   clang::Module *GlobalModuleFragment = nullptr;
 
+  /// The modules we imported directly.
+  llvm::SmallPtrSet<clang::Module *, 8> DirectModuleImports;
+
   /// Namespace definitions that we will export when they finish.
   llvm::SmallPtrSet<const NamespaceDecl*, 8> DeferredExportedNamespaces;
 
@@ -2249,6 +2252,10 @@
     return Entity->getOwningModule();
   }
 
+  bool isModuleDirectlyImported(const Module *M) {
+    return DirectModuleImports.contains(M);
+  }
+
   /// Make a merged definition of an existing hidden definition \p ND
   /// visible at the specified location.
   void makeMergedDefinitionVisible(NamedDecl *ND);


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