70 lines · cpp
1//===-- ARMMachineFunctionInfo.cpp - ARM machine function info ------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "ARMMachineFunctionInfo.h"10#include "ARMSubtarget.h"11 12using namespace llvm;13 14void ARMFunctionInfo::anchor() {}15 16yaml::ARMFunctionInfo::ARMFunctionInfo(const llvm::ARMFunctionInfo &MFI)17 : LRSpilled(MFI.isLRSpilled()) {}18 19void yaml::ARMFunctionInfo::mappingImpl(yaml::IO &YamlIO) {20 MappingTraits<ARMFunctionInfo>::mapping(YamlIO, *this);21}22 23void ARMFunctionInfo::initializeBaseYamlFields(24 const yaml::ARMFunctionInfo &YamlMFI) {25 LRSpilled = YamlMFI.LRSpilled;26}27 28static bool GetBranchTargetEnforcement(const Function &F,29 const ARMSubtarget *Subtarget) {30 if (!Subtarget->isMClass() || !Subtarget->hasV7Ops())31 return false;32 33 return F.hasFnAttribute("branch-target-enforcement");34}35 36// The pair returns values for the ARMFunctionInfo members37// SignReturnAddress and SignReturnAddressAll respectively.38static std::pair<bool, bool> GetSignReturnAddress(const Function &F) {39 if (!F.hasFnAttribute("sign-return-address")) {40 return {false, false};41 }42 43 StringRef Scope = F.getFnAttribute("sign-return-address").getValueAsString();44 if (Scope == "none")45 return {false, false};46 47 if (Scope == "all")48 return {true, true};49 50 assert(Scope == "non-leaf");51 return {true, false};52}53 54ARMFunctionInfo::ARMFunctionInfo(const Function &F,55 const ARMSubtarget *Subtarget)56 : isThumb(Subtarget->isThumb()), hasThumb2(Subtarget->hasThumb2()),57 IsCmseNSEntry(F.hasFnAttribute("cmse_nonsecure_entry")),58 IsCmseNSCall(F.hasFnAttribute("cmse_nonsecure_call")),59 BranchTargetEnforcement(GetBranchTargetEnforcement(F, Subtarget)) {60 if (Subtarget->isMClass() && Subtarget->hasV7Ops())61 std::tie(SignReturnAddress, SignReturnAddressAll) = GetSignReturnAddress(F);62}63 64MachineFunctionInfo *65ARMFunctionInfo::clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,66 const DenseMap<MachineBasicBlock *, MachineBasicBlock *>67 &Src2DstMBB) const {68 return DestMF.cloneInfo<ARMFunctionInfo>(*this);69}70