llvm-project.git/clang/test/Modules/self-referencing-lambda.cpp, branch main Unnamed repository; edit this file 'description' to name the repository. [Modules] Update test to mention it requires C++14. 2018-03-23T00:16:06+00:00 Volodymyr Sapsai vsapsai@apple.com 2018-03-23T00:16:06+00:00 932d45ce4d32e413916ed9200b5b57dca9ab9acc llvm-svn: 328283 
llvm-svn: 328283
[Modules] Fix creating fake definition data for lambdas. 2018-03-21T21:28:54+00:00 Volodymyr Sapsai vsapsai@apple.com 2018-03-21T21:28:54+00:00 8a5943f5691920cd1c2dfde975dc1951f7d8e5b4 During reading C++ definition data for lambda we can access CXXRecordDecl representing lambda before we finished reading the definition data. This can happen by reading a captured variable which is VarDecl, then reading its decl context which is CXXMethodDecl `operator()`, then trying to merge redeclarable methods and accessing enclosing CXXRecordDecl. The call stack looks roughly like VisitCXXRecordDecl ReadCXXRecordDefinition VisitVarDecl VisitCXXMethodDecl mergeRedeclarable getPrimaryContextForMerging If we add fake definition data at this point, later we'll hit the assertion Assertion failed: (!DD.IsLambda && !MergeDD.IsLambda && "faked up lambda definition?"), function MergeDefinitionData, file clang/lib/Serialization/ASTReaderDecl.cpp, line 1675. The fix is to assign definition data before reading it. Fixes PR32556. rdar://problem/37461072 Reviewers: rsmith, bruno Reviewed By: rsmith Subscribers: cfe-commits, jkorous-apple, aprantl Differential Revision: https://reviews.llvm.org/D43494 llvm-svn: 328153 
During reading C++ definition data for lambda we can access
CXXRecordDecl representing lambda before we finished reading the
definition data. This can happen by reading a captured variable which is
VarDecl, then reading its decl context which is CXXMethodDecl `operator()`,
then trying to merge redeclarable methods and accessing
enclosing CXXRecordDecl. The call stack looks roughly like

    VisitCXXRecordDecl
      ReadCXXRecordDefinition
        VisitVarDecl
          VisitCXXMethodDecl
            mergeRedeclarable
              getPrimaryContextForMerging

If we add fake definition data at this point, later we'll hit the assertion

    Assertion failed: (!DD.IsLambda && !MergeDD.IsLambda && "faked up lambda definition?"), function MergeDefinitionData, file clang/lib/Serialization/ASTReaderDecl.cpp, line 1675.

The fix is to assign definition data before reading it. Fixes PR32556.

rdar://problem/37461072

Reviewers: rsmith, bruno

Reviewed By: rsmith

Subscribers: cfe-commits, jkorous-apple, aprantl

Differential Revision: https://reviews.llvm.org/D43494

llvm-svn: 328153