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
anchor()14 void ARMFunctionInfo::anchor() {}
15
ARMFunctionInfo(const llvm::ARMFunctionInfo & MFI)16 yaml::ARMFunctionInfo::ARMFunctionInfo(const llvm::ARMFunctionInfo &MFI)
17 : LRSpilled(MFI.isLRSpilled()) {}
18
mappingImpl(yaml::IO & YamlIO)19 void yaml::ARMFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
20 MappingTraits<ARMFunctionInfo>::mapping(YamlIO, *this);
21 }
22
initializeBaseYamlFields(const yaml::ARMFunctionInfo & YamlMFI)23 void ARMFunctionInfo::initializeBaseYamlFields(
24 const yaml::ARMFunctionInfo &YamlMFI) {
25 LRSpilled = YamlMFI.LRSpilled;
26 }
27
GetBranchTargetEnforcement(const Function & F,const ARMSubtarget * Subtarget)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.
GetSignReturnAddress(const Function & F)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
ARMFunctionInfo(const Function & F,const ARMSubtarget * Subtarget)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 *
clone(BumpPtrAllocator & Allocator,MachineFunction & DestMF,const DenseMap<MachineBasicBlock *,MachineBasicBlock * > & Src2DstMBB) const65 ARMFunctionInfo::clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
66 const DenseMap<MachineBasicBlock *, MachineBasicBlock *>
67 &Src2DstMBB) const {
68 return DestMF.cloneInfo<ARMFunctionInfo>(*this);
69 }
70