1 //===- llvm/unittest/IR/PassManager.cpp - PassManager tests ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/AsmParser/Parser.h"
11 #include "llvm/IR/Function.h"
12 #include "llvm/IR/LLVMContext.h"
13 #include "llvm/IR/Module.h"
14 #include "llvm/IR/PassManager.h"
15 #include "llvm/Support/SourceMgr.h"
16 #include "gtest/gtest.h"
22 class TestFunctionAnalysis {
25 Result(int Count) : InstructionCount(Count) {}
29 /// \brief Returns an opaque, unique ID for this pass type.
30 static void *ID() { return (void *)&PassID; }
32 TestFunctionAnalysis(int &Runs) : Runs(Runs) {}
34 /// \brief Run the analysis pass over the function and return a result.
35 Result run(Function *F, FunctionAnalysisManager *AM) {
38 for (Function::iterator BBI = F->begin(), BBE = F->end(); BBI != BBE; ++BBI)
39 for (BasicBlock::iterator II = BBI->begin(), IE = BBI->end(); II != IE;
46 /// \brief Private static data to provide unique ID.
52 char TestFunctionAnalysis::PassID;
54 class TestModuleAnalysis {
57 Result(int Count) : FunctionCount(Count) {}
61 static void *ID() { return (void *)&PassID; }
63 TestModuleAnalysis(int &Runs) : Runs(Runs) {}
65 Result run(Module *M, ModuleAnalysisManager *AM) {
68 for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
79 char TestModuleAnalysis::PassID;
81 struct TestModulePass {
82 TestModulePass(int &RunCount) : RunCount(RunCount) {}
84 PreservedAnalyses run(Module *M) {
86 return PreservedAnalyses::none();
89 static StringRef name() { return "TestModulePass"; }
94 struct TestPreservingModulePass {
95 PreservedAnalyses run(Module *M) { return PreservedAnalyses::all(); }
97 static StringRef name() { return "TestPreservingModulePass"; }
100 struct TestMinPreservingModulePass {
101 PreservedAnalyses run(Module *M, ModuleAnalysisManager *AM) {
102 PreservedAnalyses PA;
104 // Force running an analysis.
105 (void)AM->getResult<TestModuleAnalysis>(M);
107 PA.preserve<FunctionAnalysisManagerModuleProxy>();
111 static StringRef name() { return "TestMinPreservingModulePass"; }
114 struct TestFunctionPass {
115 TestFunctionPass(int &RunCount, int &AnalyzedInstrCount,
116 int &AnalyzedFunctionCount,
117 bool OnlyUseCachedResults = false)
118 : RunCount(RunCount), AnalyzedInstrCount(AnalyzedInstrCount),
119 AnalyzedFunctionCount(AnalyzedFunctionCount),
120 OnlyUseCachedResults(OnlyUseCachedResults) {}
122 PreservedAnalyses run(Function *F, FunctionAnalysisManager *AM) {
125 const ModuleAnalysisManager &MAM =
126 AM->getResult<ModuleAnalysisManagerFunctionProxy>(F).getManager();
127 if (TestModuleAnalysis::Result *TMA =
128 MAM.getCachedResult<TestModuleAnalysis>(F->getParent()))
129 AnalyzedFunctionCount += TMA->FunctionCount;
131 if (OnlyUseCachedResults) {
132 // Hack to force the use of the cached interface.
133 if (TestFunctionAnalysis::Result *AR =
134 AM->getCachedResult<TestFunctionAnalysis>(F))
135 AnalyzedInstrCount += AR->InstructionCount;
137 // Typical path just runs the analysis as needed.
138 TestFunctionAnalysis::Result &AR = AM->getResult<TestFunctionAnalysis>(F);
139 AnalyzedInstrCount += AR.InstructionCount;
142 return PreservedAnalyses::all();
145 static StringRef name() { return "TestFunctionPass"; }
148 int &AnalyzedInstrCount;
149 int &AnalyzedFunctionCount;
150 bool OnlyUseCachedResults;
153 // A test function pass that invalidates all function analyses for a function
154 // with a specific name.
155 struct TestInvalidationFunctionPass {
156 TestInvalidationFunctionPass(StringRef FunctionName) : Name(FunctionName) {}
158 PreservedAnalyses run(Function *F) {
159 return F->getName() == Name ? PreservedAnalyses::none()
160 : PreservedAnalyses::all();
163 static StringRef name() { return "TestInvalidationFunctionPass"; }
168 Module *parseIR(const char *IR) {
169 LLVMContext &C = getGlobalContext();
171 return ParseAssemblyString(IR, 0, Err, C);
174 class PassManagerTest : public ::testing::Test {
176 std::unique_ptr<Module> M;
180 : M(parseIR("define void @f() {\n"
186 "define void @g() {\n"
189 "define void @h() {\n"
194 TEST_F(PassManagerTest, Basic) {
195 FunctionAnalysisManager FAM;
196 int FunctionAnalysisRuns = 0;
197 FAM.registerPass(TestFunctionAnalysis(FunctionAnalysisRuns));
199 ModuleAnalysisManager MAM;
200 int ModuleAnalysisRuns = 0;
201 MAM.registerPass(TestModuleAnalysis(ModuleAnalysisRuns));
202 MAM.registerPass(FunctionAnalysisManagerModuleProxy(FAM));
203 FAM.registerPass(ModuleAnalysisManagerFunctionProxy(MAM));
205 ModulePassManager MPM;
207 // Count the runs over a Function.
208 int FunctionPassRunCount1 = 0;
209 int AnalyzedInstrCount1 = 0;
210 int AnalyzedFunctionCount1 = 0;
212 FunctionPassManager FPM;
213 FPM.addPass(TestFunctionPass(FunctionPassRunCount1, AnalyzedInstrCount1,
214 AnalyzedFunctionCount1));
215 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
218 // Count the runs over a module.
219 int ModulePassRunCount = 0;
220 MPM.addPass(TestModulePass(ModulePassRunCount));
222 // Count the runs over a Function in a separate manager.
223 int FunctionPassRunCount2 = 0;
224 int AnalyzedInstrCount2 = 0;
225 int AnalyzedFunctionCount2 = 0;
227 FunctionPassManager FPM;
228 FPM.addPass(TestFunctionPass(FunctionPassRunCount2, AnalyzedInstrCount2,
229 AnalyzedFunctionCount2));
230 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
233 // A third function pass manager but with only preserving intervening passes
234 // and with a function pass that invalidates exactly one analysis.
235 MPM.addPass(TestPreservingModulePass());
236 int FunctionPassRunCount3 = 0;
237 int AnalyzedInstrCount3 = 0;
238 int AnalyzedFunctionCount3 = 0;
240 FunctionPassManager FPM;
241 FPM.addPass(TestFunctionPass(FunctionPassRunCount3, AnalyzedInstrCount3,
242 AnalyzedFunctionCount3));
243 FPM.addPass(TestInvalidationFunctionPass("f"));
244 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
247 // A fourth function pass manager but with a minimal intervening passes.
248 MPM.addPass(TestMinPreservingModulePass());
249 int FunctionPassRunCount4 = 0;
250 int AnalyzedInstrCount4 = 0;
251 int AnalyzedFunctionCount4 = 0;
253 FunctionPassManager FPM;
254 FPM.addPass(TestFunctionPass(FunctionPassRunCount4, AnalyzedInstrCount4,
255 AnalyzedFunctionCount4));
256 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
259 // A fifth function pass manager but which uses only cached results.
260 int FunctionPassRunCount5 = 0;
261 int AnalyzedInstrCount5 = 0;
262 int AnalyzedFunctionCount5 = 0;
264 FunctionPassManager FPM;
265 FPM.addPass(TestInvalidationFunctionPass("f"));
266 FPM.addPass(TestFunctionPass(FunctionPassRunCount5, AnalyzedInstrCount5,
267 AnalyzedFunctionCount5,
268 /*OnlyUseCachedResults=*/true));
269 MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
272 MPM.run(M.get(), &MAM);
274 // Validate module pass counters.
275 EXPECT_EQ(1, ModulePassRunCount);
277 // Validate all function pass counter sets are the same.
278 EXPECT_EQ(3, FunctionPassRunCount1);
279 EXPECT_EQ(5, AnalyzedInstrCount1);
280 EXPECT_EQ(0, AnalyzedFunctionCount1);
281 EXPECT_EQ(3, FunctionPassRunCount2);
282 EXPECT_EQ(5, AnalyzedInstrCount2);
283 EXPECT_EQ(0, AnalyzedFunctionCount2);
284 EXPECT_EQ(3, FunctionPassRunCount3);
285 EXPECT_EQ(5, AnalyzedInstrCount3);
286 EXPECT_EQ(0, AnalyzedFunctionCount3);
287 EXPECT_EQ(3, FunctionPassRunCount4);
288 EXPECT_EQ(5, AnalyzedInstrCount4);
289 EXPECT_EQ(0, AnalyzedFunctionCount4);
290 EXPECT_EQ(3, FunctionPassRunCount5);
291 EXPECT_EQ(2, AnalyzedInstrCount5); // Only 'g' and 'h' were cached.
292 EXPECT_EQ(0, AnalyzedFunctionCount5);
294 // Validate the analysis counters:
295 // first run over 3 functions, then module pass invalidates
296 // second run over 3 functions, nothing invalidates
297 // third run over 0 functions, but 1 function invalidated
298 // fourth run over 1 function
299 EXPECT_EQ(7, FunctionAnalysisRuns);
301 EXPECT_EQ(1, ModuleAnalysisRuns);