[PM] Widen the interface for invalidate on an analysis result now that

it is completely optional, and sink the logic for handling the preserved
analysis set into it.

This allows us to implement the delegation logic desired in the proxy
module analysis for the function analysis manager where if the proxy
itself is preserved we assume the set of functions hasn't changed and we
do a fine grained invalidation by walking the functions in the module
and running the invalidate for them all at the manager level and letting
it try to invalidate any passes.

This in turn makes it blindingly obvious why we should hoist the
invalidate trait and have two collections of results. That allows
handling invalidation for almost all analyses without indirect calls and
it allows short circuiting when the preserved set is all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195338 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 35 insertions, 1 deletions

diff --git a/unittests/IR/PassManagerTest.cpp b/unittests/IR/PassManagerTest.cpp
index 38ef1a4329..d23d85b882 100644
--- a/unittests/IR/PassManagerTest.cpp
+++ b/unittests/IR/PassManagerTest.cpp
@@ -64,6 +64,20 @@ struct TestModulePass {
   int &RunCount;
 };
 
+struct TestPreservingModulePass {
+  PreservedAnalyses run(Module *M) {
+    return PreservedAnalyses::all();
+  }
+};
+
+struct TestMinPreservingModulePass {
+  PreservedAnalyses run(Module *M) {
+    PreservedAnalyses PA;
+    PA.preserve<FunctionAnalysisModuleProxy>();
+    return PA;
+  }
+};
+
 struct TestFunctionPass {
   TestFunctionPass(FunctionAnalysisManager &AM, int &RunCount,
                    int &AnalyzedInstrCount)
@@ -137,6 +151,22 @@ TEST_F(PassManagerTest, Basic) {
   FPM2.addPass(TestFunctionPass(FAM, FunctionPassRunCount2, AnalyzedInstrCount2));
   MPM.addPass(createModuleToFunctionPassAdaptor(FPM2, &MAM));
 
+  // A third function pass manager but with only preserving intervening passes.
+  MPM.addPass(TestPreservingModulePass());
+  FunctionPassManager FPM3(&FAM);
+  int FunctionPassRunCount3 = 0;
+  int AnalyzedInstrCount3 = 0;
+  FPM3.addPass(TestFunctionPass(FAM, FunctionPassRunCount3, AnalyzedInstrCount3));
+  MPM.addPass(createModuleToFunctionPassAdaptor(FPM3, &MAM));
+
+  // A fourth function pass manager but with a minimal intervening passes.
+  MPM.addPass(TestMinPreservingModulePass());
+  FunctionPassManager FPM4(&FAM);
+  int FunctionPassRunCount4 = 0;
+  int AnalyzedInstrCount4 = 0;
+  FPM4.addPass(TestFunctionPass(FAM, FunctionPassRunCount4, AnalyzedInstrCount4));
+  MPM.addPass(createModuleToFunctionPassAdaptor(FPM4, &MAM));
+
   MPM.run(M.get());
 
   // Validate module pass counters.
@@ -147,8 +177,12 @@ TEST_F(PassManagerTest, Basic) {
   EXPECT_EQ(5, AnalyzedInstrCount1);
   EXPECT_EQ(3, FunctionPassRunCount2);
   EXPECT_EQ(5, AnalyzedInstrCount2);
+  EXPECT_EQ(3, FunctionPassRunCount3);
+  EXPECT_EQ(5, AnalyzedInstrCount3);
+  EXPECT_EQ(3, FunctionPassRunCount4);
+  EXPECT_EQ(5, AnalyzedInstrCount4);
 
   // Validate the analysis counters.
-  EXPECT_EQ(6, AnalysisRuns);
+  EXPECT_EQ(9, AnalysisRuns);
 }
 }