forked from OSchip/llvm-project
[CallPromotionUtils] Add tryPromoteCall.
Summary: It attempts to devirtualize a call on alloca through vtable loads. Reviewers: davidxl Subscribers: mgorny, Prazek, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71308
This commit is contained in:
Hiroshi Yamauchi
parent
6b2979c123
commit
bb383ae612
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@ -48,6 +48,29 @@ Instruction *promoteCall(CallSite CS, Function *Callee,
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Instruction *promoteCallWithIfThenElse(CallSite CS, Function *Callee,
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MDNode *BranchWeights = nullptr);
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/// Try to promote (devirtualize) a virtual call on an Alloca. Return true on
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/// success.
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///
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/// Look for a pattern like:
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///
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/// %o = alloca %class.Impl
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/// %1 = getelementptr %class.Impl, %class.Impl* %o, i64 0, i32 0, i32 0
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/// store i32 (...)** bitcast (i8** getelementptr inbounds
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/// ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV4Impl, i64 0, inrange i32 0, i64 2)
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/// to i32 (...)**), i32 (...)*** %1
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/// %2 = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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/// %3 = bitcast %class.Interface* %2 to void (%class.Interface*)***
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/// %vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %3
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/// %4 = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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/// call void %4(%class.Interface* nonnull %2)
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///
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/// @_ZTV4Impl = linkonce_odr dso_local unnamed_addr constant { [3 x i8*] }
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/// { [3 x i8*]
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/// [i8* null, i8* bitcast ({ i8*, i8*, i8* }* @_ZTI4Impl to i8*),
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/// i8* bitcast (void (%class.Impl*)* @_ZN4Impl3RunEv to i8*)] }
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///
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bool tryPromoteCall(CallSite &CS);
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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@ -12,6 +12,8 @@
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/CallPromotionUtils.h"
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#include "llvm/Analysis/Loads.h"
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#include "llvm/Analysis/TypeMetadataUtils.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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@ -458,4 +460,60 @@ Instruction *llvm::promoteCallWithIfThenElse(CallSite CS, Function *Callee,
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return promoteCall(CallSite(NewInst), Callee);
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}
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bool llvm::tryPromoteCall(CallSite &CS) {
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assert(!CS.getCalledFunction());
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Module *M = CS.getCaller()->getParent();
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const DataLayout &DL = M->getDataLayout();
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Value *Callee = CS.getCalledValue();
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LoadInst *VTableEntryLoad = dyn_cast<LoadInst>(Callee);
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if (!VTableEntryLoad)
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return false; // Not a vtable entry load.
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Value *VTableEntryPtr = VTableEntryLoad->getPointerOperand();
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APInt VTableOffset(DL.getTypeSizeInBits(VTableEntryPtr->getType()), 0);
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Value *VTableBasePtr = VTableEntryPtr->stripAndAccumulateConstantOffsets(
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DL, VTableOffset, /* AllowNonInbounds */ true);
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LoadInst *VTablePtrLoad = dyn_cast<LoadInst>(VTableBasePtr);
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if (!VTablePtrLoad)
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return false; // Not a vtable load.
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Value *Object = VTablePtrLoad->getPointerOperand();
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APInt ObjectOffset(DL.getTypeSizeInBits(Object->getType()), 0);
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Value *ObjectBase = Object->stripAndAccumulateConstantOffsets(
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DL, ObjectOffset, /* AllowNonInbounds */ true);
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if (!(isa<AllocaInst>(ObjectBase) && ObjectOffset == 0))
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// Not an Alloca or the offset isn't zero.
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return false;
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// Look for the vtable pointer store into the object by the ctor.
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BasicBlock::iterator BBI(VTablePtrLoad);
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Value *VTablePtr = FindAvailableLoadedValue(
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VTablePtrLoad, VTablePtrLoad->getParent(), BBI, 0, nullptr, nullptr);
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if (!VTablePtr)
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return false; // No vtable found.
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APInt VTableOffsetGVBase(DL.getTypeSizeInBits(VTablePtr->getType()), 0);
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Value *VTableGVBase = VTablePtr->stripAndAccumulateConstantOffsets(
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DL, VTableOffsetGVBase, /* AllowNonInbounds */ true);
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GlobalVariable *GV = dyn_cast<GlobalVariable>(VTableGVBase);
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if (!(GV && GV->isConstant() && GV->hasDefinitiveInitializer()))
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// Not in the form of a global constant variable with an initializer.
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return false;
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Constant *VTableGVInitializer = GV->getInitializer();
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APInt VTableGVOffset = VTableOffsetGVBase + VTableOffset;
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if (!(VTableGVOffset.getActiveBits() <= 64))
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return false; // Out of range.
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Constant *Ptr = getPointerAtOffset(VTableGVInitializer,
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VTableGVOffset.getZExtValue(),
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*M);
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if (!Ptr)
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return false; // No constant (function) pointer found.
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Function *DirectCallee = dyn_cast<Function>(Ptr->stripPointerCasts());
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if (!DirectCallee)
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return false; // No function pointer found.
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// Success.
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promoteCall(CS, DirectCallee);
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return true;
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}
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#undef DEBUG_TYPE
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@ -9,6 +9,7 @@ set(LLVM_LINK_COMPONENTS
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add_llvm_unittest(UtilsTests
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ASanStackFrameLayoutTest.cpp
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BasicBlockUtilsTest.cpp
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CallPromotionUtilsTest.cpp
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CloningTest.cpp
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CodeExtractorTest.cpp
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CodeMoverUtilsTest.cpp
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@ -0,0 +1,332 @@
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//===- CallPromotionUtilsTest.cpp - CallPromotionUtils unit tests ---------===//
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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/Transforms/Utils/CallPromotionUtils.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/SourceMgr.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
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SMDiagnostic Err;
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std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
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if (!Mod)
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Err.print("UtilsTests", errs());
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return Mod;
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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@_ZTV4Impl = constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* null, i8* bitcast (void (%class.Impl*)* @_ZN4Impl3RunEv to i8*)] }
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define void @f() {
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entry:
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%o = alloca %class.Impl
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%base = getelementptr %class.Impl, %class.Impl* %o, i64 0, i32 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV4Impl, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %base
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%f = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 1
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store i32 3, i32* %f
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%base.i = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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%c = bitcast %class.Interface* %base.i to void (%class.Interface*)***
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%vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %c
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%fp = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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declare void @_ZN4Impl3RunEv(%class.Impl* %this)
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &F->front().front();
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auto *AI = dyn_cast<AllocaInst>(Inst);
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ASSERT_TRUE(AI);
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Inst = &*++F->front().rbegin();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_TRUE(IsPromoted);
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GV = M->getNamedValue("_ZN4Impl3RunEv");
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ASSERT_TRUE(GV);
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auto *F1 = dyn_cast<Function>(GV);
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EXPECT_EQ(F1, CS.getCalledFunction());
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall_NoFPLoad) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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define void @f(void (%class.Interface*)* %fp, %class.Interface* nonnull %base.i) {
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entry:
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &F->front().front();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_FALSE(IsPromoted);
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall_NoVTablePtrLoad) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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define void @f(void (%class.Interface*)** %vtable.i, %class.Interface* nonnull %base.i) {
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entry:
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%fp = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &*++F->front().rbegin();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_FALSE(IsPromoted);
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall_NoVTableInitFound) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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define void @f() {
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entry:
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%o = alloca %class.Impl
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%f = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 1
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store i32 3, i32* %f
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%base.i = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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%c = bitcast %class.Interface* %base.i to void (%class.Interface*)***
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%vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %c
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%fp = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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declare void @_ZN4Impl3RunEv(%class.Impl* %this)
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &*++F->front().rbegin();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_FALSE(IsPromoted);
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall_EmptyVTable) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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@_ZTV4Impl = external global { [3 x i8*] }
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define void @f() {
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entry:
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%o = alloca %class.Impl
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%base = getelementptr %class.Impl, %class.Impl* %o, i64 0, i32 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV4Impl, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %base
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%f = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 1
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store i32 3, i32* %f
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%base.i = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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%c = bitcast %class.Interface* %base.i to void (%class.Interface*)***
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%vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %c
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%fp = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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declare void @_ZN4Impl3RunEv(%class.Impl* %this)
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &F->front().front();
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auto *AI = dyn_cast<AllocaInst>(Inst);
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ASSERT_TRUE(AI);
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Inst = &*++F->front().rbegin();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_FALSE(IsPromoted);
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}
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TEST(CallPromotionUtilsTest, TryPromoteCall_NullFP) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%class.Impl = type <{ %class.Interface, i32, [4 x i8] }>
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%class.Interface = type { i32 (...)** }
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@_ZTV4Impl = constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* null, i8* null] }
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define void @f() {
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entry:
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%o = alloca %class.Impl
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%base = getelementptr %class.Impl, %class.Impl* %o, i64 0, i32 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTV4Impl, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %base
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%f = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 1
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store i32 3, i32* %f
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%base.i = getelementptr inbounds %class.Impl, %class.Impl* %o, i64 0, i32 0
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%c = bitcast %class.Interface* %base.i to void (%class.Interface*)***
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%vtable.i = load void (%class.Interface*)**, void (%class.Interface*)*** %c
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%fp = load void (%class.Interface*)*, void (%class.Interface*)** %vtable.i
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call void %fp(%class.Interface* nonnull %base.i)
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ret void
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}
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declare void @_ZN4Impl3RunEv(%class.Impl* %this)
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)IR");
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auto *GV = M->getNamedValue("f");
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ASSERT_TRUE(GV);
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auto *F = dyn_cast<Function>(GV);
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ASSERT_TRUE(F);
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Instruction *Inst = &F->front().front();
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auto *AI = dyn_cast<AllocaInst>(Inst);
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ASSERT_TRUE(AI);
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Inst = &*++F->front().rbegin();
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auto *CI = dyn_cast<CallInst>(Inst);
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ASSERT_TRUE(CI);
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CallSite CS(CI);
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ASSERT_FALSE(CS.getCalledFunction());
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bool IsPromoted = tryPromoteCall(CS);
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EXPECT_FALSE(IsPromoted);
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}
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// Based on clang/test/CodeGenCXX/member-function-pointer-calls.cpp
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TEST(CallPromotionUtilsTest, TryPromoteCall_MemberFunctionCalls) {
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LLVMContext C;
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std::unique_ptr<Module> M = parseIR(C,
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R"IR(
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%struct.A = type { i32 (...)** }
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@_ZTV1A = linkonce_odr unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* null, i8* bitcast (i32 (%struct.A*)* @_ZN1A3vf1Ev to i8*), i8* bitcast (i32 (%struct.A*)* @_ZN1A3vf2Ev to i8*)] }, align 8
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define i32 @_Z2g1v() {
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entry:
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%a = alloca %struct.A, align 8
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%0 = bitcast %struct.A* %a to i8*
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%1 = getelementptr %struct.A, %struct.A* %a, i64 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [4 x i8*] }, { [4 x i8*] }* @_ZTV1A, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %1, align 8
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%2 = bitcast %struct.A* %a to i8*
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%3 = bitcast i8* %2 to i8**
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%vtable.i = load i8*, i8** %3, align 8
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%4 = bitcast i8* %vtable.i to i32 (%struct.A*)**
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%memptr.virtualfn.i = load i32 (%struct.A*)*, i32 (%struct.A*)** %4, align 8
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%call.i = call i32 %memptr.virtualfn.i(%struct.A* %a)
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ret i32 %call.i
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||||
}
|
||||
|
||||
define i32 @_Z2g2v() {
|
||||
entry:
|
||||
%a = alloca %struct.A, align 8
|
||||
%0 = bitcast %struct.A* %a to i8*
|
||||
%1 = getelementptr %struct.A, %struct.A* %a, i64 0, i32 0
|
||||
store i32 (...)** bitcast (i8** getelementptr inbounds ({ [4 x i8*] }, { [4 x i8*] }* @_ZTV1A, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %1, align 8
|
||||
%2 = bitcast %struct.A* %a to i8*
|
||||
%3 = bitcast i8* %2 to i8**
|
||||
%vtable.i = load i8*, i8** %3, align 8
|
||||
%4 = getelementptr i8, i8* %vtable.i, i64 8
|
||||
%5 = bitcast i8* %4 to i32 (%struct.A*)**
|
||||
%memptr.virtualfn.i = load i32 (%struct.A*)*, i32 (%struct.A*)** %5, align 8
|
||||
%call.i = call i32 %memptr.virtualfn.i(%struct.A* %a)
|
||||
ret i32 %call.i
|
||||
}
|
||||
|
||||
declare i32 @_ZN1A3vf1Ev(%struct.A* %this)
|
||||
declare i32 @_ZN1A3vf2Ev(%struct.A* %this)
|
||||
)IR");
|
||||
|
||||
auto *GV = M->getNamedValue("_Z2g1v");
|
||||
ASSERT_TRUE(GV);
|
||||
auto *F = dyn_cast<Function>(GV);
|
||||
ASSERT_TRUE(F);
|
||||
Instruction *Inst = &F->front().front();
|
||||
auto *AI = dyn_cast<AllocaInst>(Inst);
|
||||
ASSERT_TRUE(AI);
|
||||
Inst = &*++F->front().rbegin();
|
||||
auto *CI = dyn_cast<CallInst>(Inst);
|
||||
ASSERT_TRUE(CI);
|
||||
CallSite CS1(CI);
|
||||
ASSERT_FALSE(CS1.getCalledFunction());
|
||||
bool IsPromoted1 = tryPromoteCall(CS1);
|
||||
EXPECT_TRUE(IsPromoted1);
|
||||
GV = M->getNamedValue("_ZN1A3vf1Ev");
|
||||
ASSERT_TRUE(GV);
|
||||
F = dyn_cast<Function>(GV);
|
||||
EXPECT_EQ(F, CS1.getCalledFunction());
|
||||
|
||||
GV = M->getNamedValue("_Z2g2v");
|
||||
ASSERT_TRUE(GV);
|
||||
F = dyn_cast<Function>(GV);
|
||||
ASSERT_TRUE(F);
|
||||
Inst = &F->front().front();
|
||||
AI = dyn_cast<AllocaInst>(Inst);
|
||||
ASSERT_TRUE(AI);
|
||||
Inst = &*++F->front().rbegin();
|
||||
CI = dyn_cast<CallInst>(Inst);
|
||||
ASSERT_TRUE(CI);
|
||||
CallSite CS2(CI);
|
||||
ASSERT_FALSE(CS2.getCalledFunction());
|
||||
bool IsPromoted2 = tryPromoteCall(CS2);
|
||||
EXPECT_TRUE(IsPromoted2);
|
||||
GV = M->getNamedValue("_ZN1A3vf2Ev");
|
||||
ASSERT_TRUE(GV);
|
||||
F = dyn_cast<Function>(GV);
|
||||
EXPECT_EQ(F, CS2.getCalledFunction());
|
||||
}
|
||||
Loading…
Reference in New Issue