[PM] Introduce an analysis set used to preserve all analyses over
a function's CFG when that CFG is unchanged.
This allows transformation passes to simply claim they preserve the CFG
and analysis passes to check for the CFG being preserved to remove the
fanout of all analyses being listed in all passes.
I've gone through and removed or cleaned up as many of the comments
reminding us to do this as I could.
Differential Revision: https://reviews.llvm.org/D28627
llvm-svn: 292054
diff --git a/llvm/lib/Analysis/DominanceFrontier.cpp b/llvm/lib/Analysis/DominanceFrontier.cpp
index 15856c3..5b6e2d0 100644
--- a/llvm/lib/Analysis/DominanceFrontier.cpp
+++ b/llvm/lib/Analysis/DominanceFrontier.cpp
@@ -56,6 +56,16 @@
}
#endif
+/// Handle invalidation explicitly.
+bool DominanceFrontier::invalidate(Function &F, const PreservedAnalyses &PA,
+ FunctionAnalysisManager::Invalidator &) {
+ // Check whether the analysis, all analyses on functions, or the function's
+ // CFG have been preserved.
+ auto PAC = PA.getChecker<DominanceFrontierAnalysis>();
+ return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+ PAC.preservedSet<CFGAnalyses>());
+}
+
AnalysisKey DominanceFrontierAnalysis::Key;
DominanceFrontier DominanceFrontierAnalysis::run(Function &F,