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352 lines
11 KiB
C++
352 lines
11 KiB
C++
//===- llvm/unittests/IR/DominatorTreeBatchUpdatesTest.cpp ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <random>
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#include "CFGBuilder.h"
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#include "gtest/gtest.h"
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#include "llvm/Analysis/PostDominators.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/Support/GenericDomTreeConstruction.h"
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#define DEBUG_TYPE "batch-update-tests"
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using namespace llvm;
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namespace {
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const auto CFGInsert = CFGBuilder::ActionKind::Insert;
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const auto CFGDelete = CFGBuilder::ActionKind::Delete;
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using DomUpdate = DominatorTree::UpdateType;
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static_assert(
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std::is_same<DomUpdate, PostDominatorTree::UpdateType>::value,
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"Trees differing only in IsPostDom should have the same update types");
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using DomSNCA = DomTreeBuilder::SemiNCAInfo<DomTreeBuilder::BBDomTree>;
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using PostDomSNCA = DomTreeBuilder::SemiNCAInfo<DomTreeBuilder::BBPostDomTree>;
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const auto Insert = DominatorTree::Insert;
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const auto Delete = DominatorTree::Delete;
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std::vector<DomUpdate> ToDomUpdates(CFGBuilder &B,
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std::vector<CFGBuilder::Update> &In) {
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std::vector<DomUpdate> Res;
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Res.reserve(In.size());
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for (const auto &CFGU : In)
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Res.push_back({CFGU.Action == CFGInsert ? Insert : Delete,
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B.getOrAddBlock(CFGU.Edge.From),
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B.getOrAddBlock(CFGU.Edge.To)});
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return Res;
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}
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} // namespace
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TEST(DominatorTreeBatchUpdates, LegalizeDomUpdates) {
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CFGHolder Holder;
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CFGBuilder Builder(Holder.F, {{"A", "B"}}, {});
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BasicBlock *A = Builder.getOrAddBlock("A");
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BasicBlock *B = Builder.getOrAddBlock("B");
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BasicBlock *C = Builder.getOrAddBlock("C");
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BasicBlock *D = Builder.getOrAddBlock("D");
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std::vector<DomUpdate> Updates = {
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{Insert, B, C}, {Insert, C, D}, {Delete, B, C}, {Insert, B, C},
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{Insert, B, D}, {Delete, C, D}, {Delete, A, B}};
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SmallVector<DomUpdate, 4> Legalized;
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cfg::LegalizeUpdates<BasicBlock *>(Updates, Legalized, false);
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LLVM_DEBUG(dbgs() << "Legalized updates:\t");
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LLVM_DEBUG(for (auto &U : Legalized) { U.dump(); dbgs() << ", "; });
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LLVM_DEBUG(dbgs() << "\n");
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EXPECT_EQ(Legalized.size(), 3UL);
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Insert, B, C}), Legalized.end());
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Insert, B, D}), Legalized.end());
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Delete, A, B}), Legalized.end());
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}
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TEST(DominatorTreeBatchUpdates, LegalizePostDomUpdates) {
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CFGHolder Holder;
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CFGBuilder Builder(Holder.F, {{"A", "B"}}, {});
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BasicBlock *A = Builder.getOrAddBlock("A");
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BasicBlock *B = Builder.getOrAddBlock("B");
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BasicBlock *C = Builder.getOrAddBlock("C");
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BasicBlock *D = Builder.getOrAddBlock("D");
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std::vector<DomUpdate> Updates = {
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{Insert, B, C}, {Insert, C, D}, {Delete, B, C}, {Insert, B, C},
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{Insert, B, D}, {Delete, C, D}, {Delete, A, B}};
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SmallVector<DomUpdate, 4> Legalized;
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cfg::LegalizeUpdates<BasicBlock *>(Updates, Legalized, true);
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LLVM_DEBUG(dbgs() << "Legalized postdom updates:\t");
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LLVM_DEBUG(for (auto &U : Legalized) { U.dump(); dbgs() << ", "; });
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LLVM_DEBUG(dbgs() << "\n");
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EXPECT_EQ(Legalized.size(), 3UL);
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Insert, C, B}), Legalized.end());
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Insert, D, B}), Legalized.end());
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EXPECT_NE(llvm::find(Legalized, DomUpdate{Delete, B, A}), Legalized.end());
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}
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TEST(DominatorTreeBatchUpdates, SingleInsertion) {
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CFGHolder Holder;
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CFGBuilder Builder(Holder.F, {{"A", "B"}}, {{CFGInsert, {"B", "C"}}});
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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BasicBlock *B = Builder.getOrAddBlock("B");
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BasicBlock *C = Builder.getOrAddBlock("C");
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std::vector<DomUpdate> Updates = {{Insert, B, C}};
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ASSERT_TRUE(Builder.applyUpdate());
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DT.applyUpdates(Updates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(Updates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, SingleDeletion) {
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CFGHolder Holder;
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CFGBuilder Builder(Holder.F, {{"A", "B"}, {"B", "C"}},
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{{CFGDelete, {"B", "C"}}});
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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BasicBlock *B = Builder.getOrAddBlock("B");
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BasicBlock *C = Builder.getOrAddBlock("C");
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std::vector<DomUpdate> Updates = {{Delete, B, C}};
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ASSERT_TRUE(Builder.applyUpdate());
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DT.applyUpdates(Updates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(Updates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, FewInsertion) {
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std::vector<CFGBuilder::Update> CFGUpdates = {{CFGInsert, {"B", "C"}},
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{CFGInsert, {"C", "B"}},
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{CFGInsert, {"C", "D"}},
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{CFGInsert, {"D", "E"}}};
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CFGHolder Holder;
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CFGBuilder Builder(Holder.F, {{"A", "B"}}, CFGUpdates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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BasicBlock *B = Builder.getOrAddBlock("B");
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BasicBlock *C = Builder.getOrAddBlock("C");
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BasicBlock *D = Builder.getOrAddBlock("D");
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BasicBlock *E = Builder.getOrAddBlock("E");
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std::vector<DomUpdate> Updates = {
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{Insert, B, C}, {Insert, C, B}, {Insert, C, D}, {Insert, D, E}};
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while (Builder.applyUpdate())
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;
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DT.applyUpdates(Updates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(Updates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, FewDeletions) {
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std::vector<CFGBuilder::Update> CFGUpdates = {{CFGDelete, {"B", "C"}},
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{CFGDelete, {"C", "B"}},
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{CFGDelete, {"B", "D"}},
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{CFGDelete, {"D", "E"}}};
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CFGHolder Holder;
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CFGBuilder Builder(
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Holder.F, {{"A", "B"}, {"B", "C"}, {"B", "D"}, {"D", "E"}, {"C", "B"}},
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CFGUpdates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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auto Updates = ToDomUpdates(Builder, CFGUpdates);
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while (Builder.applyUpdate())
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;
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DT.applyUpdates(Updates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(Updates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, InsertDelete) {
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std::vector<CFGBuilder::Arc> Arcs = {
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{"1", "2"}, {"2", "3"}, {"3", "4"}, {"4", "5"}, {"5", "6"}, {"5", "7"},
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{"3", "8"}, {"8", "9"}, {"9", "10"}, {"8", "11"}, {"11", "12"}};
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std::vector<CFGBuilder::Update> Updates = {
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{CFGInsert, {"2", "4"}}, {CFGInsert, {"12", "10"}},
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{CFGInsert, {"10", "9"}}, {CFGInsert, {"7", "6"}},
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{CFGInsert, {"7", "5"}}, {CFGDelete, {"3", "8"}},
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{CFGInsert, {"10", "7"}}, {CFGInsert, {"2", "8"}},
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{CFGDelete, {"3", "4"}}, {CFGDelete, {"8", "9"}},
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{CFGDelete, {"11", "12"}}};
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CFGHolder Holder;
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CFGBuilder B(Holder.F, Arcs, Updates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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while (B.applyUpdate())
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;
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auto DomUpdates = ToDomUpdates(B, Updates);
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DT.applyUpdates(DomUpdates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(DomUpdates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, InsertDeleteExhaustive) {
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std::vector<CFGBuilder::Arc> Arcs = {
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{"1", "2"}, {"2", "3"}, {"3", "4"}, {"4", "5"}, {"5", "6"}, {"5", "7"},
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{"3", "8"}, {"8", "9"}, {"9", "10"}, {"8", "11"}, {"11", "12"}};
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std::vector<CFGBuilder::Update> Updates = {
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{CFGInsert, {"2", "4"}}, {CFGInsert, {"12", "10"}},
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{CFGInsert, {"10", "9"}}, {CFGInsert, {"7", "6"}},
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{CFGInsert, {"7", "5"}}, {CFGDelete, {"3", "8"}},
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{CFGInsert, {"10", "7"}}, {CFGInsert, {"2", "8"}},
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{CFGDelete, {"3", "4"}}, {CFGDelete, {"8", "9"}},
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{CFGDelete, {"11", "12"}}};
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std::mt19937 Generator(0);
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for (unsigned i = 0; i < 16; ++i) {
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std::shuffle(Updates.begin(), Updates.end(), Generator);
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CFGHolder Holder;
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CFGBuilder B(Holder.F, Arcs, Updates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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while (B.applyUpdate())
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;
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auto DomUpdates = ToDomUpdates(B, Updates);
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DT.applyUpdates(DomUpdates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(DomUpdates);
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EXPECT_TRUE(PDT.verify());
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}
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}
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// These are some odd flowgraphs, usually generated from csmith cases,
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// which are difficult on post dom trees.
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TEST(DominatorTreeBatchUpdates, InfiniteLoop) {
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std::vector<CFGBuilder::Arc> Arcs = {
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{"1", "2"},
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{"2", "3"},
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{"3", "6"}, {"3", "5"},
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{"4", "5"},
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{"5", "2"},
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{"6", "3"}, {"6", "4"}};
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// SplitBlock on 3 -> 5
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std::vector<CFGBuilder::Update> Updates = {
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{CFGInsert, {"N", "5"}}, {CFGInsert, {"3", "N"}}, {CFGDelete, {"3", "5"}}};
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CFGHolder Holder;
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CFGBuilder B(Holder.F, Arcs, Updates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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while (B.applyUpdate())
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;
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auto DomUpdates = ToDomUpdates(B, Updates);
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DT.applyUpdates(DomUpdates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(DomUpdates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, DeadBlocks) {
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std::vector<CFGBuilder::Arc> Arcs = {
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{"1", "2"},
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{"2", "3"},
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{"3", "4"}, {"3", "7"},
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{"4", "4"},
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{"5", "6"}, {"5", "7"},
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{"6", "7"},
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{"7", "2"}, {"7", "8"}};
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// Remove dead 5 and 7,
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// plus SplitBlock on 7 -> 8
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std::vector<CFGBuilder::Update> Updates = {
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{CFGDelete, {"6", "7"}}, {CFGDelete, {"5", "7"}}, {CFGDelete, {"5", "6"}},
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{CFGInsert, {"N", "8"}}, {CFGInsert, {"7", "N"}}, {CFGDelete, {"7", "8"}}};
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CFGHolder Holder;
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CFGBuilder B(Holder.F, Arcs, Updates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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while (B.applyUpdate())
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;
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auto DomUpdates = ToDomUpdates(B, Updates);
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DT.applyUpdates(DomUpdates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(DomUpdates);
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EXPECT_TRUE(PDT.verify());
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}
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TEST(DominatorTreeBatchUpdates, InfiniteLoop2) {
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std::vector<CFGBuilder::Arc> Arcs = {
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{"1", "2"},
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{"2", "6"}, {"2", "3"},
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{"3", "4"},
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{"4", "5"}, {"4", "6"},
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{"5", "4"},
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{"6", "2"}};
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// SplitBlock on 4 -> 6
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std::vector<CFGBuilder::Update> Updates = {
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{CFGInsert, {"N", "6"}}, {CFGInsert, {"4", "N"}}, {CFGDelete, {"4", "6"}}};
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CFGHolder Holder;
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CFGBuilder B(Holder.F, Arcs, Updates);
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DominatorTree DT(*Holder.F);
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EXPECT_TRUE(DT.verify());
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PostDominatorTree PDT(*Holder.F);
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EXPECT_TRUE(PDT.verify());
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while (B.applyUpdate())
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;
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auto DomUpdates = ToDomUpdates(B, Updates);
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DT.applyUpdates(DomUpdates);
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EXPECT_TRUE(DT.verify());
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PDT.applyUpdates(DomUpdates);
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EXPECT_TRUE(PDT.verify());
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}
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