From ca68a3ec47416185252b84d2bf60710c88be155f Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Sun, 15 Jan 2017 06:32:49 +0000
Subject: [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
---
 llvm/lib/Analysis/BlockFrequencyInfo.cpp |  9 +++++++++
 llvm/lib/Analysis/DominanceFrontier.cpp  | 10 ++++++++++
 llvm/lib/Analysis/LoopInfo.cpp           |  9 +++++++++
 llvm/lib/Analysis/PostDominators.cpp     |  9 +++++++++
 llvm/lib/Analysis/RegionInfo.cpp         |  9 +++++++++
 5 files changed, 46 insertions(+)

(limited to 'llvm/lib/Analysis')

diff --git a/llvm/lib/Analysis/BlockFrequencyInfo.cpp b/llvm/lib/Analysis/BlockFrequencyInfo.cpp
index 4cdbe4d0fcf..9c1c9667a67 100644
--- a/llvm/lib/Analysis/BlockFrequencyInfo.cpp
+++ b/llvm/lib/Analysis/BlockFrequencyInfo.cpp
@@ -132,6 +132,15 @@ BlockFrequencyInfo &BlockFrequencyInfo::operator=(BlockFrequencyInfo &&RHS) {
 // template instantiated which is not available in the header.
 BlockFrequencyInfo::~BlockFrequencyInfo() {}
 
+bool BlockFrequencyInfo::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<BlockFrequencyAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 void BlockFrequencyInfo::calculate(const Function &F,
                                    const BranchProbabilityInfo &BPI,
                                    const LoopInfo &LI) {
diff --git a/llvm/lib/Analysis/DominanceFrontier.cpp b/llvm/lib/Analysis/DominanceFrontier.cpp
index 15856c3f8b7..5b6e2d0476e 100644
--- a/llvm/lib/Analysis/DominanceFrontier.cpp
+++ b/llvm/lib/Analysis/DominanceFrontier.cpp
@@ -56,6 +56,16 @@ LLVM_DUMP_METHOD void DominanceFrontierWrapperPass::dump() const {
 }
 #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,
diff --git a/llvm/lib/Analysis/LoopInfo.cpp b/llvm/lib/Analysis/LoopInfo.cpp
index 1b5d6e5d1b7..fb05e60e57d 100644
--- a/llvm/lib/Analysis/LoopInfo.cpp
+++ b/llvm/lib/Analysis/LoopInfo.cpp
@@ -610,6 +610,15 @@ LoopInfo::LoopInfo(const DominatorTreeBase<BasicBlock> &DomTree) {
   analyze(DomTree);
 }
 
+bool LoopInfo::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<LoopAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 void LoopInfo::markAsRemoved(Loop *Unloop) {
   assert(!Unloop->isInvalid() && "Loop has already been removed");
   Unloop->invalidate();
diff --git a/llvm/lib/Analysis/PostDominators.cpp b/llvm/lib/Analysis/PostDominators.cpp
index cb9438a2f92..1caf151546d 100644
--- a/llvm/lib/Analysis/PostDominators.cpp
+++ b/llvm/lib/Analysis/PostDominators.cpp
@@ -31,6 +31,15 @@ char PostDominatorTreeWrapperPass::ID = 0;
 INITIALIZE_PASS(PostDominatorTreeWrapperPass, "postdomtree",
                 "Post-Dominator Tree Construction", true, true)
 
+bool PostDominatorTree::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<PostDominatorTreeAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 bool PostDominatorTreeWrapperPass::runOnFunction(Function &F) {
   DT.recalculate(F);
   return false;
diff --git a/llvm/lib/Analysis/RegionInfo.cpp b/llvm/lib/Analysis/RegionInfo.cpp
index 8c084ddd226..63ef8d28d44 100644
--- a/llvm/lib/Analysis/RegionInfo.cpp
+++ b/llvm/lib/Analysis/RegionInfo.cpp
@@ -83,6 +83,15 @@ RegionInfo::~RegionInfo() {
 
 }
 
+bool RegionInfo::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<RegionInfoAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 void RegionInfo::updateStatistics(Region *R) {
   ++numRegions;
 
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