1 //=======- CaptureTrackingTest.cpp - Unit test for the Capture Tracking ---===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Analysis/CaptureTracking.h" 10 #include "llvm/Analysis/OrderedBasicBlock.h" 11 #include "llvm/AsmParser/Parser.h" 12 #include "llvm/IR/Dominators.h" 13 #include "llvm/IR/Instructions.h" 14 #include "llvm/IR/LLVMContext.h" 15 #include "llvm/IR/Module.h" 16 #include "llvm/Support/SourceMgr.h" 17 #include "gtest/gtest.h" 18 19 using namespace llvm; 20 21 TEST(CaptureTracking, MaxUsesToExplore) { 22 StringRef Assembly = R"( 23 ; Function Attrs: nounwind ssp uwtable 24 declare void @doesnt_capture(i8* nocapture, i8* nocapture, i8* nocapture, 25 i8* nocapture, i8* nocapture) 26 27 ; %arg has 5 uses 28 define void @test_few_uses(i8* %arg) { 29 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 30 ret void 31 } 32 33 ; %arg has 50 uses 34 define void @test_many_uses(i8* %arg) { 35 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 36 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 37 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 38 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 39 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 40 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 41 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 42 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 43 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 44 call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) 45 ret void 46 } 47 )"; 48 49 LLVMContext Context; 50 SMDiagnostic Error; 51 auto M = parseAssemblyString(Assembly, Error, Context); 52 ASSERT_TRUE(M) << "Bad assembly?"; 53 54 auto Test = [&M](const char *FName, unsigned FalseMaxUsesLimit, 55 unsigned TrueMaxUsesLimit) { 56 Function *F = M->getFunction(FName); 57 ASSERT_NE(F, nullptr); 58 Value *Arg = &*F->arg_begin(); 59 ASSERT_NE(Arg, nullptr); 60 ASSERT_FALSE(PointerMayBeCaptured(Arg, true, true, FalseMaxUsesLimit)); 61 ASSERT_TRUE(PointerMayBeCaptured(Arg, true, true, TrueMaxUsesLimit)); 62 63 BasicBlock *EntryBB = &F->getEntryBlock(); 64 DominatorTree DT(*F); 65 OrderedBasicBlock OBB(EntryBB); 66 67 Instruction *Ret = EntryBB->getTerminator(); 68 ASSERT_TRUE(isa<ReturnInst>(Ret)); 69 ASSERT_FALSE(PointerMayBeCapturedBefore(Arg, true, true, Ret, &DT, false, 70 &OBB, FalseMaxUsesLimit)); 71 ASSERT_TRUE(PointerMayBeCapturedBefore(Arg, true, true, Ret, &DT, false, 72 &OBB, TrueMaxUsesLimit)); 73 }; 74 75 Test("test_few_uses", 6, 4); 76 Test("test_many_uses", 50, 30); 77 } 78