| Artur Pilipenko | a25a344 | 2019-01-03 20:16:33 +0000 | [diff] [blame] | 1 | //=======- CaptureTrackingTest.cpp - Unit test for the Capture Tracking ---===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "llvm/Analysis/CaptureTracking.h" |
| 11 | #include "llvm/Analysis/OrderedBasicBlock.h" |
| 12 | #include "llvm/AsmParser/Parser.h" |
| 13 | #include "llvm/IR/Dominators.h" |
| 14 | #include "llvm/IR/Instructions.h" |
| 15 | #include "llvm/IR/LLVMContext.h" |
| 16 | #include "llvm/IR/Module.h" |
| 17 | #include "llvm/Support/SourceMgr.h" |
| 18 | #include "gtest/gtest.h" |
| 19 | |
| 20 | using namespace llvm; |
| 21 | |
| 22 | TEST(CaptureTracking, MaxUsesToExplore) { |
| 23 | StringRef Assembly = R"( |
| 24 | ; Function Attrs: nounwind ssp uwtable |
| 25 | declare void @doesnt_capture(i8* nocapture, i8* nocapture, i8* nocapture, |
| 26 | i8* nocapture, i8* nocapture) |
| 27 | |
| 28 | ; %arg has 5 uses |
| 29 | define void @test_few_uses(i8* %arg) { |
| 30 | call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) |
| 31 | ret void |
| 32 | } |
| 33 | |
| 34 | ; %arg has 50 uses |
| 35 | define void @test_many_uses(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 | call void @doesnt_capture(i8* %arg, i8* %arg, i8* %arg, i8* %arg, i8* %arg) |
| 46 | ret void |
| 47 | } |
| 48 | )"; |
| 49 | |
| 50 | LLVMContext Context; |
| 51 | SMDiagnostic Error; |
| 52 | auto M = parseAssemblyString(Assembly, Error, Context); |
| 53 | ASSERT_TRUE(M) << "Bad assembly?"; |
| 54 | |
| 55 | auto Test = [&M](const char *FName, unsigned FalseMaxUsesLimit, |
| 56 | unsigned TrueMaxUsesLimit) { |
| 57 | Function *F = M->getFunction(FName); |
| 58 | ASSERT_NE(F, nullptr); |
| 59 | Value *Arg = &*F->arg_begin(); |
| 60 | ASSERT_NE(Arg, nullptr); |
| 61 | ASSERT_FALSE(PointerMayBeCaptured(Arg, true, true, FalseMaxUsesLimit)); |
| 62 | ASSERT_TRUE(PointerMayBeCaptured(Arg, true, true, TrueMaxUsesLimit)); |
| 63 | |
| 64 | BasicBlock *EntryBB = &F->getEntryBlock(); |
| 65 | DominatorTree DT(*F); |
| 66 | OrderedBasicBlock OBB(EntryBB); |
| 67 | |
| 68 | Instruction *Ret = EntryBB->getTerminator(); |
| 69 | ASSERT_TRUE(isa<ReturnInst>(Ret)); |
| 70 | ASSERT_FALSE(PointerMayBeCapturedBefore(Arg, true, true, Ret, &DT, false, |
| 71 | &OBB, FalseMaxUsesLimit)); |
| 72 | ASSERT_TRUE(PointerMayBeCapturedBefore(Arg, true, true, Ret, &DT, false, |
| 73 | &OBB, TrueMaxUsesLimit)); |
| 74 | }; |
| 75 | |
| 76 | Test("test_few_uses", 6, 4); |
| 77 | Test("test_many_uses", 50, 30); |
| 78 | } |