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/Assembly/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 struct TestModulePass {
55 TestModulePass(int &RunCount) : RunCount(RunCount) {}
57 PreservedAnalyses run(Module *M) {
59 return PreservedAnalyses::none();
65 struct TestPreservingModulePass {
66 PreservedAnalyses run(Module *M) {
67 return PreservedAnalyses::all();
71 struct TestMinPreservingModulePass {
72 PreservedAnalyses run(Module *M, ModuleAnalysisManager *AM) {
75 // Check that we can get cached result objects for modules.
76 const FunctionAnalysisManagerModuleProxy::Result *R =
77 AM->getCachedResult<FunctionAnalysisManagerModuleProxy>(M);
78 (void)R; // FIXME: We should test this better by querying an actual analysis
79 // pass in interesting ways.
81 PA.preserve<FunctionAnalysisManagerModuleProxy>();
86 struct TestFunctionPass {
87 TestFunctionPass(int &RunCount, int &AnalyzedInstrCount,
88 bool OnlyUseCachedResults = false)
89 : RunCount(RunCount), AnalyzedInstrCount(AnalyzedInstrCount),
90 OnlyUseCachedResults(OnlyUseCachedResults) {}
92 PreservedAnalyses run(Function *F, FunctionAnalysisManager *AM) {
95 if (OnlyUseCachedResults) {
96 // Hack to force the use of the cached interface.
97 if (const TestFunctionAnalysis::Result *AR =
98 AM->getCachedResult<TestFunctionAnalysis>(F))
99 AnalyzedInstrCount += AR->InstructionCount;
101 // Typical path just runs the analysis as needed.
102 const TestFunctionAnalysis::Result &AR = AM->getResult<TestFunctionAnalysis>(F);
103 AnalyzedInstrCount += AR.InstructionCount;
106 return PreservedAnalyses::all();
110 int &AnalyzedInstrCount;
111 bool OnlyUseCachedResults;
114 // A test function pass that invalidates all function analyses for a function
115 // with a specific name.
116 struct TestInvalidationFunctionPass {
117 TestInvalidationFunctionPass(StringRef FunctionName) : Name(FunctionName) {}
119 PreservedAnalyses run(Function *F) {
120 return F->getName() == Name ? PreservedAnalyses::none()
121 : PreservedAnalyses::all();
127 Module *parseIR(const char *IR) {
128 LLVMContext &C = getGlobalContext();
130 return ParseAssemblyString(IR, 0, Err, C);
133 class PassManagerTest : public ::testing::Test {
139 : M(parseIR("define void @f() {\n"
145 "define void @g() {\n"
148 "define void @h() {\n"
153 TEST_F(PassManagerTest, Basic) {
154 FunctionAnalysisManager FAM;
155 int AnalysisRuns = 0;
156 FAM.registerPass(TestFunctionAnalysis(AnalysisRuns));
158 ModuleAnalysisManager MAM;
159 MAM.registerPass(FunctionAnalysisManagerModuleProxy(FAM));
161 ModulePassManager MPM;
163 // Count the runs over a Function.
164 FunctionPassManager FPM1;
165 int FunctionPassRunCount1 = 0;
166 int AnalyzedInstrCount1 = 0;
167 FPM1.addPass(TestFunctionPass(FunctionPassRunCount1, AnalyzedInstrCount1));
168 MPM.addPass(createModuleToFunctionPassAdaptor(FPM1));
170 // Count the runs over a module.
171 int ModulePassRunCount = 0;
172 MPM.addPass(TestModulePass(ModulePassRunCount));
174 // Count the runs over a Function in a separate manager.
175 FunctionPassManager FPM2;
176 int FunctionPassRunCount2 = 0;
177 int AnalyzedInstrCount2 = 0;
178 FPM2.addPass(TestFunctionPass(FunctionPassRunCount2, AnalyzedInstrCount2));
179 MPM.addPass(createModuleToFunctionPassAdaptor(FPM2));
181 // A third function pass manager but with only preserving intervening passes
182 // and with a function pass that invalidates exactly one analysis.
183 MPM.addPass(TestPreservingModulePass());
184 FunctionPassManager FPM3;
185 int FunctionPassRunCount3 = 0;
186 int AnalyzedInstrCount3 = 0;
187 FPM3.addPass(TestFunctionPass(FunctionPassRunCount3, AnalyzedInstrCount3));
188 FPM3.addPass(TestInvalidationFunctionPass("f"));
189 MPM.addPass(createModuleToFunctionPassAdaptor(FPM3));
191 // A fourth function pass manager but with a minimal intervening passes.
192 MPM.addPass(TestMinPreservingModulePass());
193 FunctionPassManager FPM4;
194 int FunctionPassRunCount4 = 0;
195 int AnalyzedInstrCount4 = 0;
196 FPM4.addPass(TestFunctionPass(FunctionPassRunCount4, AnalyzedInstrCount4));
197 MPM.addPass(createModuleToFunctionPassAdaptor(FPM4));
199 // A fifth function pass manager but which uses only cached results.
200 FunctionPassManager FPM5;
201 int FunctionPassRunCount5 = 0;
202 int AnalyzedInstrCount5 = 0;
203 FPM5.addPass(TestInvalidationFunctionPass("f"));
204 FPM5.addPass(TestFunctionPass(FunctionPassRunCount5, AnalyzedInstrCount5,
205 /*OnlyUseCachedResults=*/true));
206 MPM.addPass(createModuleToFunctionPassAdaptor(FPM5));
208 MPM.run(M.get(), &MAM);
210 // Validate module pass counters.
211 EXPECT_EQ(1, ModulePassRunCount);
213 // Validate all function pass counter sets are the same.
214 EXPECT_EQ(3, FunctionPassRunCount1);
215 EXPECT_EQ(5, AnalyzedInstrCount1);
216 EXPECT_EQ(3, FunctionPassRunCount2);
217 EXPECT_EQ(5, AnalyzedInstrCount2);
218 EXPECT_EQ(3, FunctionPassRunCount3);
219 EXPECT_EQ(5, AnalyzedInstrCount3);
220 EXPECT_EQ(3, FunctionPassRunCount4);
221 EXPECT_EQ(5, AnalyzedInstrCount4);
222 EXPECT_EQ(3, FunctionPassRunCount5);
223 EXPECT_EQ(2, AnalyzedInstrCount5); // Only 'g' and 'h' were cached.
225 // Validate the analysis counters:
226 // first run over 3 functions, then module pass invalidates
227 // second run over 3 functions, nothing invalidates
228 // third run over 0 functions, but 1 function invalidated
229 // fourth run over 1 function
230 EXPECT_EQ(7, AnalysisRuns);