forked from OSchip/llvm-project
544 lines
21 KiB
C++
544 lines
21 KiB
C++
//===- SparsePropagation.cpp - Unit tests for the generic solver ----------===//
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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 "llvm/Analysis/SparsePropagation.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/IRBuilder.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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/// To enable interprocedural analysis, we assign LLVM values to the following
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/// groups. The register group represents SSA registers, the return group
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/// represents the return values of functions, and the memory group represents
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/// in-memory values. An LLVM Value can technically be in more than one group.
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/// It's necessary to distinguish these groups so we can, for example, track a
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/// global variable separately from the value stored at its location.
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enum class IPOGrouping { Register, Return, Memory };
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/// Our LatticeKeys are PointerIntPairs composed of LLVM values and groupings.
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/// The PointerIntPair header provides a DenseMapInfo specialization, so using
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/// these as LatticeKeys is fine.
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using TestLatticeKey = PointerIntPair<Value *, 2, IPOGrouping>;
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} // namespace
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namespace llvm {
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/// A specialization of LatticeKeyInfo for TestLatticeKeys. The generic solver
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/// must translate between LatticeKeys and LLVM Values when adding Values to
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/// its work list and inspecting the state of control-flow related values.
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template <> struct LatticeKeyInfo<TestLatticeKey> {
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static inline Value *getValueFromLatticeKey(TestLatticeKey Key) {
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return Key.getPointer();
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}
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static inline TestLatticeKey getLatticeKeyFromValue(Value *V) {
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return TestLatticeKey(V, IPOGrouping::Register);
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}
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};
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} // namespace llvm
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namespace {
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/// This class defines a simple test lattice value that could be used for
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/// solving problems similar to constant propagation. The value is maintained
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/// as a PointerIntPair.
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class TestLatticeVal {
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public:
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/// The states of the lattices value. Only the ConstantVal state is
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/// interesting; the rest are special states used by the generic solver. The
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/// UntrackedVal state differs from the other three in that the generic
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/// solver uses it to avoid doing unnecessary work. In particular, when a
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/// value moves to the UntrackedVal state, it's users are not notified.
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enum TestLatticeStateTy {
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UndefinedVal,
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ConstantVal,
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OverdefinedVal,
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UntrackedVal
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};
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TestLatticeVal() : LatticeVal(nullptr, UndefinedVal) {}
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TestLatticeVal(Constant *C, TestLatticeStateTy State)
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: LatticeVal(C, State) {}
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/// Return true if this lattice value is in the Constant state. This is used
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/// for checking the solver results.
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bool isConstant() const { return LatticeVal.getInt() == ConstantVal; }
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/// Return true if this lattice value is in the Overdefined state. This is
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/// used for checking the solver results.
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bool isOverdefined() const { return LatticeVal.getInt() == OverdefinedVal; }
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bool operator==(const TestLatticeVal &RHS) const {
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return LatticeVal == RHS.LatticeVal;
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}
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bool operator!=(const TestLatticeVal &RHS) const {
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return LatticeVal != RHS.LatticeVal;
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}
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private:
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/// A simple lattice value type for problems similar to constant propagation.
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/// It holds the constant value and the lattice state.
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PointerIntPair<const Constant *, 2, TestLatticeStateTy> LatticeVal;
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};
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/// This class defines a simple test lattice function that could be used for
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/// solving problems similar to constant propagation. The test lattice differs
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/// from a "real" lattice in a few ways. First, it initializes all return
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/// values, values stored in global variables, and arguments in the undefined
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/// state. This means that there are no limitations on what we can track
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/// interprocedurally. For simplicity, all global values in the tests will be
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/// given internal linkage, since this is not something this lattice function
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/// tracks. Second, it only handles the few instructions necessary for the
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/// tests.
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class TestLatticeFunc
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: public AbstractLatticeFunction<TestLatticeKey, TestLatticeVal> {
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public:
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/// Construct a new test lattice function with special values for the
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/// Undefined, Overdefined, and Untracked states.
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TestLatticeFunc()
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: AbstractLatticeFunction(
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TestLatticeVal(nullptr, TestLatticeVal::UndefinedVal),
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TestLatticeVal(nullptr, TestLatticeVal::OverdefinedVal),
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TestLatticeVal(nullptr, TestLatticeVal::UntrackedVal)) {}
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/// Compute and return a TestLatticeVal for the given TestLatticeKey. For the
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/// test analysis, a LatticeKey will begin in the undefined state, unless it
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/// represents an LLVM Constant in the register grouping.
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TestLatticeVal ComputeLatticeVal(TestLatticeKey Key) override {
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if (Key.getInt() == IPOGrouping::Register)
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if (auto *C = dyn_cast<Constant>(Key.getPointer()))
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return TestLatticeVal(C, TestLatticeVal::ConstantVal);
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return getUndefVal();
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}
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/// Merge the two given lattice values. This merge should be equivalent to
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/// what is done for constant propagation. That is, the resulting lattice
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/// value is constant only if the two given lattice values are constant and
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/// hold the same value.
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TestLatticeVal MergeValues(TestLatticeVal X, TestLatticeVal Y) override {
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if (X == getUntrackedVal() || Y == getUntrackedVal())
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return getUntrackedVal();
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if (X == getOverdefinedVal() || Y == getOverdefinedVal())
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return getOverdefinedVal();
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if (X == getUndefVal() && Y == getUndefVal())
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return getUndefVal();
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if (X == getUndefVal())
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return Y;
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if (Y == getUndefVal())
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return X;
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if (X == Y)
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return X;
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return getOverdefinedVal();
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}
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/// Compute the lattice values that change as a result of executing the given
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/// instruction. We only handle the few instructions needed for the tests.
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void ComputeInstructionState(
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Instruction &I, DenseMap<TestLatticeKey, TestLatticeVal> &ChangedValues,
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SparseSolver<TestLatticeKey, TestLatticeVal> &SS) override {
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switch (I.getOpcode()) {
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case Instruction::Call:
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return visitCallSite(cast<CallInst>(&I), ChangedValues, SS);
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case Instruction::Ret:
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return visitReturn(*cast<ReturnInst>(&I), ChangedValues, SS);
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case Instruction::Store:
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return visitStore(*cast<StoreInst>(&I), ChangedValues, SS);
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default:
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return visitInst(I, ChangedValues, SS);
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}
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}
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private:
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/// Handle call sites. The state of a called function's argument is the merge
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/// of the current formal argument state with the call site's corresponding
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/// actual argument state. The call site state is the merge of the call site
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/// state with the returned value state of the called function.
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void visitCallSite(CallSite CS,
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DenseMap<TestLatticeKey, TestLatticeVal> &ChangedValues,
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SparseSolver<TestLatticeKey, TestLatticeVal> &SS) {
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Function *F = CS.getCalledFunction();
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Instruction *I = CS.getInstruction();
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auto RegI = TestLatticeKey(I, IPOGrouping::Register);
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if (!F) {
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ChangedValues[RegI] = getOverdefinedVal();
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return;
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}
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SS.MarkBlockExecutable(&F->front());
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for (Argument &A : F->args()) {
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auto RegFormal = TestLatticeKey(&A, IPOGrouping::Register);
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auto RegActual =
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TestLatticeKey(CS.getArgument(A.getArgNo()), IPOGrouping::Register);
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ChangedValues[RegFormal] =
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MergeValues(SS.getValueState(RegFormal), SS.getValueState(RegActual));
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}
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auto RetF = TestLatticeKey(F, IPOGrouping::Return);
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ChangedValues[RegI] =
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MergeValues(SS.getValueState(RegI), SS.getValueState(RetF));
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}
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/// Handle return instructions. The function's return state is the merge of
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/// the returned value state and the function's current return state.
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void visitReturn(ReturnInst &I,
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DenseMap<TestLatticeKey, TestLatticeVal> &ChangedValues,
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SparseSolver<TestLatticeKey, TestLatticeVal> &SS) {
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Function *F = I.getParent()->getParent();
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if (F->getReturnType()->isVoidTy())
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return;
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auto RegR = TestLatticeKey(I.getReturnValue(), IPOGrouping::Register);
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auto RetF = TestLatticeKey(F, IPOGrouping::Return);
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ChangedValues[RetF] =
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MergeValues(SS.getValueState(RegR), SS.getValueState(RetF));
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}
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/// Handle store instructions. If the pointer operand of the store is a
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/// global variable, we attempt to track the value. The global variable state
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/// is the merge of the stored value state with the current global variable
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/// state.
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void visitStore(StoreInst &I,
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DenseMap<TestLatticeKey, TestLatticeVal> &ChangedValues,
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SparseSolver<TestLatticeKey, TestLatticeVal> &SS) {
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auto *GV = dyn_cast<GlobalVariable>(I.getPointerOperand());
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if (!GV)
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return;
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auto RegVal = TestLatticeKey(I.getValueOperand(), IPOGrouping::Register);
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auto MemPtr = TestLatticeKey(GV, IPOGrouping::Memory);
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ChangedValues[MemPtr] =
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MergeValues(SS.getValueState(RegVal), SS.getValueState(MemPtr));
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}
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/// Handle all other instructions. All other instructions are marked
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/// overdefined.
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void visitInst(Instruction &I,
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DenseMap<TestLatticeKey, TestLatticeVal> &ChangedValues,
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SparseSolver<TestLatticeKey, TestLatticeVal> &SS) {
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auto RegI = TestLatticeKey(&I, IPOGrouping::Register);
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ChangedValues[RegI] = getOverdefinedVal();
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}
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};
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/// This class defines the common data used for all of the tests. The tests
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/// should add code to the module and then run the solver.
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class SparsePropagationTest : public testing::Test {
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protected:
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LLVMContext Context;
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Module M;
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IRBuilder<> Builder;
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TestLatticeFunc Lattice;
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SparseSolver<TestLatticeKey, TestLatticeVal> Solver;
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public:
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SparsePropagationTest()
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: M("", Context), Builder(Context), Solver(&Lattice) {}
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};
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} // namespace
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/// Test that we mark discovered functions executable.
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///
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/// define internal void @f() {
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/// call void @g()
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/// ret void
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/// }
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///
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/// define internal void @g() {
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/// call void @f()
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/// ret void
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/// }
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///
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/// For this test, we initially mark "f" executable, and the solver discovers
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/// "g" because of the call in "f". The mutually recursive call in "g" also
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/// tests that we don't add a block to the basic block work list if it is
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/// already executable. Doing so would put the solver into an infinite loop.
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TEST_F(SparsePropagationTest, MarkBlockExecutable) {
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Function *F = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "f", &M);
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Function *G = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "g", &M);
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BasicBlock *FEntry = BasicBlock::Create(Context, "", F);
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BasicBlock *GEntry = BasicBlock::Create(Context, "", G);
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Builder.SetInsertPoint(FEntry);
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Builder.CreateCall(G);
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Builder.CreateRetVoid();
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Builder.SetInsertPoint(GEntry);
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Builder.CreateCall(F);
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Builder.CreateRetVoid();
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Solver.MarkBlockExecutable(FEntry);
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Solver.Solve();
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EXPECT_TRUE(Solver.isBlockExecutable(GEntry));
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}
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/// Test that we propagate information through global variables.
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///
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/// @gv = internal global i64
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///
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/// define internal void @f() {
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/// store i64 1, i64* @gv
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/// ret void
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/// }
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///
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/// define internal void @g() {
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/// store i64 1, i64* @gv
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/// ret void
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/// }
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///
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/// For this test, we initially mark both "f" and "g" executable, and the
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/// solver computes the lattice state of the global variable as constant.
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TEST_F(SparsePropagationTest, GlobalVariableConstant) {
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Function *F = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "f", &M);
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Function *G = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "g", &M);
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GlobalVariable *GV =
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new GlobalVariable(M, Builder.getInt64Ty(), false,
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GlobalValue::InternalLinkage, nullptr, "gv");
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BasicBlock *FEntry = BasicBlock::Create(Context, "", F);
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BasicBlock *GEntry = BasicBlock::Create(Context, "", G);
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Builder.SetInsertPoint(FEntry);
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Builder.CreateStore(Builder.getInt64(1), GV);
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Builder.CreateRetVoid();
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Builder.SetInsertPoint(GEntry);
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Builder.CreateStore(Builder.getInt64(1), GV);
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Builder.CreateRetVoid();
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Solver.MarkBlockExecutable(FEntry);
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Solver.MarkBlockExecutable(GEntry);
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Solver.Solve();
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auto MemGV = TestLatticeKey(GV, IPOGrouping::Memory);
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EXPECT_TRUE(Solver.getExistingValueState(MemGV).isConstant());
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}
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/// Test that we propagate information through global variables.
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///
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/// @gv = internal global i64
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///
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/// define internal void @f() {
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/// store i64 0, i64* @gv
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/// ret void
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/// }
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///
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/// define internal void @g() {
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/// store i64 1, i64* @gv
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/// ret void
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/// }
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///
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/// For this test, we initially mark both "f" and "g" executable, and the
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/// solver computes the lattice state of the global variable as overdefined.
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TEST_F(SparsePropagationTest, GlobalVariableOverDefined) {
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Function *F = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "f", &M);
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Function *G = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "g", &M);
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GlobalVariable *GV =
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new GlobalVariable(M, Builder.getInt64Ty(), false,
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GlobalValue::InternalLinkage, nullptr, "gv");
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BasicBlock *FEntry = BasicBlock::Create(Context, "", F);
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BasicBlock *GEntry = BasicBlock::Create(Context, "", G);
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Builder.SetInsertPoint(FEntry);
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Builder.CreateStore(Builder.getInt64(0), GV);
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Builder.CreateRetVoid();
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Builder.SetInsertPoint(GEntry);
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Builder.CreateStore(Builder.getInt64(1), GV);
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Builder.CreateRetVoid();
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Solver.MarkBlockExecutable(FEntry);
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Solver.MarkBlockExecutable(GEntry);
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Solver.Solve();
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auto MemGV = TestLatticeKey(GV, IPOGrouping::Memory);
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EXPECT_TRUE(Solver.getExistingValueState(MemGV).isOverdefined());
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}
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/// Test that we propagate information through function returns.
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///
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/// define internal i64 @f(i1* %cond) {
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/// if:
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/// %0 = load i1, i1* %cond
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/// br i1 %0, label %then, label %else
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///
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/// then:
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/// ret i64 1
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///
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/// else:
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/// ret i64 1
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/// }
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///
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/// For this test, we initially mark "f" executable, and the solver computes
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/// the return value of the function as constant.
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TEST_F(SparsePropagationTest, FunctionDefined) {
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Function *F =
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Function::Create(FunctionType::get(Builder.getInt64Ty(),
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{Type::getInt1PtrTy(Context)}, false),
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GlobalValue::InternalLinkage, "f", &M);
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BasicBlock *If = BasicBlock::Create(Context, "if", F);
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BasicBlock *Then = BasicBlock::Create(Context, "then", F);
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BasicBlock *Else = BasicBlock::Create(Context, "else", F);
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F->arg_begin()->setName("cond");
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Builder.SetInsertPoint(If);
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LoadInst *Cond = Builder.CreateLoad(Type::getInt1Ty(Context), F->arg_begin());
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Builder.CreateCondBr(Cond, Then, Else);
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Builder.SetInsertPoint(Then);
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Builder.CreateRet(Builder.getInt64(1));
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Builder.SetInsertPoint(Else);
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Builder.CreateRet(Builder.getInt64(1));
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Solver.MarkBlockExecutable(If);
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Solver.Solve();
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auto RetF = TestLatticeKey(F, IPOGrouping::Return);
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EXPECT_TRUE(Solver.getExistingValueState(RetF).isConstant());
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}
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/// Test that we propagate information through function returns.
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///
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/// define internal i64 @f(i1* %cond) {
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/// if:
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/// %0 = load i1, i1* %cond
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/// br i1 %0, label %then, label %else
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///
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/// then:
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/// ret i64 0
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///
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/// else:
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/// ret i64 1
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/// }
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///
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/// For this test, we initially mark "f" executable, and the solver computes
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/// the return value of the function as overdefined.
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TEST_F(SparsePropagationTest, FunctionOverDefined) {
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Function *F =
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Function::Create(FunctionType::get(Builder.getInt64Ty(),
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{Type::getInt1PtrTy(Context)}, false),
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GlobalValue::InternalLinkage, "f", &M);
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BasicBlock *If = BasicBlock::Create(Context, "if", F);
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BasicBlock *Then = BasicBlock::Create(Context, "then", F);
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BasicBlock *Else = BasicBlock::Create(Context, "else", F);
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F->arg_begin()->setName("cond");
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Builder.SetInsertPoint(If);
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LoadInst *Cond = Builder.CreateLoad(Type::getInt1Ty(Context), F->arg_begin());
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Builder.CreateCondBr(Cond, Then, Else);
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Builder.SetInsertPoint(Then);
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Builder.CreateRet(Builder.getInt64(0));
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Builder.SetInsertPoint(Else);
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Builder.CreateRet(Builder.getInt64(1));
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Solver.MarkBlockExecutable(If);
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Solver.Solve();
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auto RetF = TestLatticeKey(F, IPOGrouping::Return);
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EXPECT_TRUE(Solver.getExistingValueState(RetF).isOverdefined());
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}
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/// Test that we propagate information through arguments.
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///
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/// define internal void @f() {
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/// call void @g(i64 0, i64 1)
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/// call void @g(i64 1, i64 1)
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/// ret void
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/// }
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///
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/// define internal void @g(i64 %a, i64 %b) {
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/// ret void
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/// }
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///
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/// For this test, we initially mark "f" executable, and the solver discovers
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/// "g" because of the calls in "f". The solver computes the state of argument
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/// "a" as overdefined and the state of "b" as constant.
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///
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/// In addition, this test demonstrates that ComputeInstructionState can alter
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/// the state of multiple lattice values, in addition to the one associated
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/// with the instruction definition. Each call instruction in this test updates
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/// the state of arguments "a" and "b".
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TEST_F(SparsePropagationTest, ComputeInstructionState) {
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Function *F = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
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GlobalValue::InternalLinkage, "f", &M);
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Function *G = Function::Create(
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FunctionType::get(Builder.getVoidTy(),
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{Builder.getInt64Ty(), Builder.getInt64Ty()}, false),
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GlobalValue::InternalLinkage, "g", &M);
|
|
Argument *A = G->arg_begin();
|
|
Argument *B = std::next(G->arg_begin());
|
|
A->setName("a");
|
|
B->setName("b");
|
|
BasicBlock *FEntry = BasicBlock::Create(Context, "", F);
|
|
BasicBlock *GEntry = BasicBlock::Create(Context, "", G);
|
|
Builder.SetInsertPoint(FEntry);
|
|
Builder.CreateCall(G, {Builder.getInt64(0), Builder.getInt64(1)});
|
|
Builder.CreateCall(G, {Builder.getInt64(1), Builder.getInt64(1)});
|
|
Builder.CreateRetVoid();
|
|
Builder.SetInsertPoint(GEntry);
|
|
Builder.CreateRetVoid();
|
|
|
|
Solver.MarkBlockExecutable(FEntry);
|
|
Solver.Solve();
|
|
|
|
auto RegA = TestLatticeKey(A, IPOGrouping::Register);
|
|
auto RegB = TestLatticeKey(B, IPOGrouping::Register);
|
|
EXPECT_TRUE(Solver.getExistingValueState(RegA).isOverdefined());
|
|
EXPECT_TRUE(Solver.getExistingValueState(RegB).isConstant());
|
|
}
|
|
|
|
/// Test that we can handle exceptional terminator instructions.
|
|
///
|
|
/// declare internal void @p()
|
|
///
|
|
/// declare internal void @g()
|
|
///
|
|
/// define internal void @f() personality i8* bitcast (void ()* @p to i8*) {
|
|
/// entry:
|
|
/// invoke void @g()
|
|
/// to label %exit unwind label %catch.pad
|
|
///
|
|
/// catch.pad:
|
|
/// %0 = catchswitch within none [label %catch.body] unwind to caller
|
|
///
|
|
/// catch.body:
|
|
/// %1 = catchpad within %0 []
|
|
/// catchret from %1 to label %exit
|
|
///
|
|
/// exit:
|
|
/// ret void
|
|
/// }
|
|
///
|
|
/// For this test, we initially mark the entry block executable. The solver
|
|
/// then discovers the rest of the blocks in the function are executable.
|
|
TEST_F(SparsePropagationTest, ExceptionalTerminatorInsts) {
|
|
Function *P = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
|
|
GlobalValue::InternalLinkage, "p", &M);
|
|
Function *G = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
|
|
GlobalValue::InternalLinkage, "g", &M);
|
|
Function *F = Function::Create(FunctionType::get(Builder.getVoidTy(), false),
|
|
GlobalValue::InternalLinkage, "f", &M);
|
|
Constant *C =
|
|
ConstantExpr::getCast(Instruction::BitCast, P, Builder.getInt8PtrTy());
|
|
F->setPersonalityFn(C);
|
|
BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
|
|
BasicBlock *Pad = BasicBlock::Create(Context, "catch.pad", F);
|
|
BasicBlock *Body = BasicBlock::Create(Context, "catch.body", F);
|
|
BasicBlock *Exit = BasicBlock::Create(Context, "exit", F);
|
|
Builder.SetInsertPoint(Entry);
|
|
Builder.CreateInvoke(G, Exit, Pad);
|
|
Builder.SetInsertPoint(Pad);
|
|
CatchSwitchInst *CatchSwitch =
|
|
Builder.CreateCatchSwitch(ConstantTokenNone::get(Context), nullptr, 1);
|
|
CatchSwitch->addHandler(Body);
|
|
Builder.SetInsertPoint(Body);
|
|
CatchPadInst *CatchPad = Builder.CreateCatchPad(CatchSwitch, {});
|
|
Builder.CreateCatchRet(CatchPad, Exit);
|
|
Builder.SetInsertPoint(Exit);
|
|
Builder.CreateRetVoid();
|
|
|
|
Solver.MarkBlockExecutable(Entry);
|
|
Solver.Solve();
|
|
|
|
EXPECT_TRUE(Solver.isBlockExecutable(Pad));
|
|
EXPECT_TRUE(Solver.isBlockExecutable(Body));
|
|
EXPECT_TRUE(Solver.isBlockExecutable(Exit));
|
|
}
|