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 void MachineSSAContext::setFunction(MachineFunction &Fn) { 25 MF = &Fn; 26 RegInfo = &MF->getRegInfo(); 27 } 28 29 MachineBasicBlock *MachineSSAContext::getEntryBlock(MachineFunction &F) { 30 return &F.front(); 31 } 32 33 void MachineSSAContext::appendBlockTerms( 34 SmallVectorImpl<const MachineInstr *> &terms, 35 const MachineBasicBlock &block) { 36 for (auto &T : block.terminators()) 37 terms.push_back(&T); 38 } 39 40 void MachineSSAContext::appendBlockDefs(SmallVectorImpl<Register> &defs, 41 const MachineBasicBlock &block) { 42 for (const MachineInstr &instr : block.instrs()) { 43 for (const MachineOperand &op : instr.all_defs()) 44 defs.push_back(op.getReg()); 45 } 46 } 47 48 /// Get the defining block of a value. 49 MachineBasicBlock *MachineSSAContext::getDefBlock(Register value) const { 50 if (!value) 51 return nullptr; 52 return RegInfo->getVRegDef(value)->getParent(); 53 } 54 55 bool MachineSSAContext::isConstantOrUndefValuePhi(const MachineInstr &Phi) { 56 return Phi.isConstantValuePHI(); 57 } 58 59 Printable MachineSSAContext::print(const MachineBasicBlock *Block) const { 60 if (!Block) 61 return Printable([](raw_ostream &Out) { Out << "<nullptr>"; }); 62 return Printable([Block](raw_ostream &Out) { Block->printName(Out); }); 63 } 64 65 Printable MachineSSAContext::print(const MachineInstr *I) const { 66 return Printable([I](raw_ostream &Out) { I->print(Out); }); 67 } 68 69 Printable MachineSSAContext::print(Register Value) const { 70 auto *MRI = RegInfo; 71 return Printable([MRI, Value](raw_ostream &Out) { 72 Out << printReg(Value, MRI->getTargetRegisterInfo(), 0, MRI); 73 74 if (Value) { 75 // Try to print the definition. 76 if (auto *Instr = MRI->getUniqueVRegDef(Value)) { 77 Out << ": "; 78 Instr->print(Out); 79 } 80 } 81 }); 82 } 83