1 //===- MachineSSAContext.cpp ------------------------------------*- 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 /// \file 9 /// 10 /// This file defines a specialization of the GenericSSAContext<X> 11 /// template class for Machine IR. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/CodeGen/MachineSSAContext.h" 16 #include "llvm/CodeGen/MachineBasicBlock.h" 17 #include "llvm/CodeGen/MachineFunction.h" 18 #include "llvm/CodeGen/MachineInstr.h" 19 #include "llvm/CodeGen/MachineRegisterInfo.h" 20 #include "llvm/Support/raw_ostream.h" 21 22 using namespace llvm; 23 24 const Register MachineSSAContext::ValueRefNull{}; 25 26 void MachineSSAContext::setFunction(MachineFunction &Fn) { 27 MF = &Fn; 28 RegInfo = &MF->getRegInfo(); 29 } 30 31 MachineBasicBlock *MachineSSAContext::getEntryBlock(MachineFunction &F) { 32 return &F.front(); 33 } 34 35 void MachineSSAContext::appendBlockTerms( 36 SmallVectorImpl<const MachineInstr *> &terms, 37 const MachineBasicBlock &block) { 38 for (auto &T : block.terminators()) 39 terms.push_back(&T); 40 } 41 42 void MachineSSAContext::appendBlockDefs(SmallVectorImpl<Register> &defs, 43 const MachineBasicBlock &block) { 44 for (const MachineInstr &instr : block.instrs()) { 45 for (const MachineOperand &op : instr.all_defs()) 46 defs.push_back(op.getReg()); 47 } 48 } 49 50 /// Get the defining block of a value. 51 MachineBasicBlock *MachineSSAContext::getDefBlock(Register value) const { 52 if (!value) 53 return nullptr; 54 return RegInfo->getVRegDef(value)->getParent(); 55 } 56 57 bool MachineSSAContext::isConstantOrUndefValuePhi(const MachineInstr &Phi) { 58 return Phi.isConstantValuePHI(); 59 } 60 61 Printable MachineSSAContext::print(const MachineBasicBlock *Block) const { 62 if (!Block) 63 return Printable([](raw_ostream &Out) { Out << "<nullptr>"; }); 64 return Printable([Block](raw_ostream &Out) { Block->printName(Out); }); 65 } 66 67 Printable MachineSSAContext::print(const MachineInstr *I) const { 68 return Printable([I](raw_ostream &Out) { I->print(Out); }); 69 } 70 71 Printable MachineSSAContext::print(Register Value) const { 72 auto *MRI = RegInfo; 73 return Printable([MRI, Value](raw_ostream &Out) { 74 Out << printReg(Value, MRI->getTargetRegisterInfo(), 0, MRI); 75 76 if (Value) { 77 // Try to print the definition. 78 if (auto *Instr = MRI->getUniqueVRegDef(Value)) { 79 Out << ": "; 80 Instr->print(Out); 81 } 82 } 83 }); 84 } 85