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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "ARMMachineFunctionInfo.h" 10 #include "ARMSubtarget.h" 11 12 using namespace llvm; 13 14 void ARMFunctionInfo::anchor() {} 15 16 yaml::ARMFunctionInfo::ARMFunctionInfo(const llvm::ARMFunctionInfo &MFI) 17 : LRSpilled(MFI.isLRSpilled()) {} 18 19 void yaml::ARMFunctionInfo::mappingImpl(yaml::IO &YamlIO) { 20 MappingTraits<ARMFunctionInfo>::mapping(YamlIO, *this); 21 } 22 23 void ARMFunctionInfo::initializeBaseYamlFields( 24 const yaml::ARMFunctionInfo &YamlMFI) { 25 LRSpilled = YamlMFI.LRSpilled; 26 } 27 28 static 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 members 37 // SignReturnAddress and SignReturnAddressAll respectively. 38 static 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 54 ARMFunctionInfo::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 64 MachineFunctionInfo * 65 ARMFunctionInfo::clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF, 66 const DenseMap<MachineBasicBlock *, MachineBasicBlock *> 67 &Src2DstMBB) const { 68 return DestMF.cloneInfo<ARMFunctionInfo>(*this); 69 } 70