1 //=- RISCVMachineFunctionInfo.cpp - RISC-V machine function info --*- C++ -*-=// 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 // This file declares RISCV-specific per-machine-function information. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "RISCVMachineFunctionInfo.h" 14 #include "llvm/IR/Module.h" 15 16 using namespace llvm; 17 18 yaml::RISCVMachineFunctionInfo::RISCVMachineFunctionInfo( 19 const llvm::RISCVMachineFunctionInfo &MFI) 20 : VarArgsFrameIndex(MFI.getVarArgsFrameIndex()), 21 VarArgsSaveSize(MFI.getVarArgsSaveSize()) {} 22 23 MachineFunctionInfo *RISCVMachineFunctionInfo::clone( 24 BumpPtrAllocator &Allocator, MachineFunction &DestMF, 25 const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB) 26 const { 27 return DestMF.cloneInfo<RISCVMachineFunctionInfo>(*this); 28 } 29 30 RISCVMachineFunctionInfo::RISCVMachineFunctionInfo(const Function &F, 31 const RISCVSubtarget *STI) { 32 33 // The default stack probe size is 4096 if the function has no 34 // stack-probe-size attribute. This is a safe default because it is the 35 // smallest possible guard page size. 36 uint64_t ProbeSize = 4096; 37 if (F.hasFnAttribute("stack-probe-size")) 38 ProbeSize = F.getFnAttributeAsParsedInteger("stack-probe-size"); 39 else if (const auto *PS = mdconst::extract_or_null<ConstantInt>( 40 F.getParent()->getModuleFlag("stack-probe-size"))) 41 ProbeSize = PS->getZExtValue(); 42 assert(int64_t(ProbeSize) > 0 && "Invalid stack probe size"); 43 44 // Round down to the stack alignment. 45 uint64_t StackAlign = 46 STI->getFrameLowering()->getTransientStackAlign().value(); 47 ProbeSize = std::max(StackAlign, alignDown(ProbeSize, StackAlign)); 48 StringRef ProbeKind; 49 if (F.hasFnAttribute("probe-stack")) 50 ProbeKind = F.getFnAttribute("probe-stack").getValueAsString(); 51 else if (const auto *PS = dyn_cast_or_null<MDString>( 52 F.getParent()->getModuleFlag("probe-stack"))) 53 ProbeKind = PS->getString(); 54 if (ProbeKind.size()) { 55 StackProbeSize = ProbeSize; 56 } 57 } 58 59 void yaml::RISCVMachineFunctionInfo::mappingImpl(yaml::IO &YamlIO) { 60 MappingTraits<RISCVMachineFunctionInfo>::mapping(YamlIO, *this); 61 } 62 63 void RISCVMachineFunctionInfo::initializeBaseYamlFields( 64 const yaml::RISCVMachineFunctionInfo &YamlMFI) { 65 VarArgsFrameIndex = YamlMFI.VarArgsFrameIndex; 66 VarArgsSaveSize = YamlMFI.VarArgsSaveSize; 67 } 68 69 void RISCVMachineFunctionInfo::addSExt32Register(Register Reg) { 70 SExt32Registers.push_back(Reg); 71 } 72 73 bool RISCVMachineFunctionInfo::isSExt32Register(Register Reg) const { 74 return is_contained(SExt32Registers, Reg); 75 } 76