[-Wunsafe-buffer-usage] Move the whole analysis to the end of a translation unit

The unsafe-buffer analysis requires a complete view of the translation
unit (TU) to be conservative. So the analysis is moved to the end of a
TU.

A summary of changes made: add a new `IssueWarnings` function in
`AnalysisBasedWarnings.cpp` for TU-based analyses. So far
[-Wunsafe-buffer-usage] is the only analysis using it but there could
be more.  `Sema` will call the new `IssueWarnings` function at the end
of parsing a TU.

Reviewed by: NoQ (Artem Dergachev)

Differential revision: https://reviews.llvm.org/D146342

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/include/clang/Sema/AnalysisBasedWarnings.h b/clang/include/clang/Sema/AnalysisBasedWarnings.h
index 13a88bb9f896..c73506894db9 100644
--- a/clang/include/clang/Sema/AnalysisBasedWarnings.h
+++ b/clang/include/clang/Sema/AnalysisBasedWarnings.h
@@ -13,6 +13,7 @@
 #ifndef LLVM_CLANG_SEMA_ANALYSISBASEDWARNINGS_H
 #define LLVM_CLANG_SEMA_ANALYSISBASEDWARNINGS_H
 
+#include "clang/AST/Decl.h"
 #include "llvm/ADT/DenseMap.h"
 #include <memory>
 
@@ -95,6 +96,9 @@ public:
   void IssueWarnings(Policy P, FunctionScopeInfo *fscope,
                      const Decl *D, QualType BlockType);
 
+  // Issue warnings that require whole-translation-unit analysis.
+  void IssueWarnings(const TranslationUnitDecl *D);
+
   Policy getDefaultPolicy() { return DefaultPolicy; }
 
   void PrintStats() const;