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
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, MFI&: *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(Kind: "branch-target-enforcement");
34}
35
36// The pair returns values for the ARMFunctionInfo members
37// SignReturnAddress and SignReturnAddressAll respectively.
38static std::pair<bool, bool> GetSignReturnAddress(const Function &F) {
39 if (!F.hasFnAttribute(Kind: "sign-return-address")) {
40 return {false, false};
41 }
42
43 StringRef Scope = F.getFnAttribute(Kind: "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(Kind: "cmse_nonsecure_entry")),
58 IsCmseNSCall(F.hasFnAttribute(Kind: "cmse_nonsecure_call")),
59 BranchTargetEnforcement(GetBranchTargetEnforcement(F, Subtarget)) {
60 if (Subtarget->isMClass() && Subtarget->hasV7Ops())
61 std::tie(args&: SignReturnAddress, args&: 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>(Old: *this);
69}
70