1 //===-- HexagonAsmPrinter.cpp - Print machine instrs to Hexagon assembly --===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to Hexagon assembly language. This printer is
12 // the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
17 #include "HexagonAsmPrinter.h"
18 #include "HexagonMachineFunctionInfo.h"
19 #include "HexagonSubtarget.h"
20 #include "HexagonTargetMachine.h"
21 #include "MCTargetDesc/HexagonInstPrinter.h"
22 #include "MCTargetDesc/HexagonMCInstrInfo.h"
23 #include "MCTargetDesc/HexagonMCShuffler.h"
24 #include "llvm/ADT/SmallString.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/Analysis/ConstantFolding.h"
28 #include "llvm/CodeGen/AsmPrinter.h"
29 #include "llvm/CodeGen/MachineFunctionPass.h"
30 #include "llvm/CodeGen/MachineInstr.h"
31 #include "llvm/CodeGen/MachineInstrBuilder.h"
32 #include "llvm/CodeGen/MachineModuleInfo.h"
33 #include "llvm/IR/Constants.h"
34 #include "llvm/IR/DataLayout.h"
35 #include "llvm/IR/DerivedTypes.h"
36 #include "llvm/IR/Mangler.h"
37 #include "llvm/IR/Module.h"
38 #include "llvm/MC/MCAsmInfo.h"
39 #include "llvm/MC/MCContext.h"
40 #include "llvm/MC/MCExpr.h"
41 #include "llvm/MC/MCInst.h"
42 #include "llvm/MC/MCSection.h"
43 #include "llvm/MC/MCStreamer.h"
44 #include "llvm/MC/MCSymbol.h"
45 #include "llvm/Support/CommandLine.h"
46 #include "llvm/Support/Compiler.h"
47 #include "llvm/Support/Debug.h"
48 #include "llvm/Support/Format.h"
49 #include "llvm/Support/MathExtras.h"
50 #include "llvm/Support/TargetRegistry.h"
51 #include "llvm/Support/raw_ostream.h"
52 #include "llvm/Target/TargetInstrInfo.h"
53 #include "llvm/Target/TargetLoweringObjectFile.h"
54 #include "llvm/Target/TargetOptions.h"
55 #include "llvm/Target/TargetRegisterInfo.h"
59 #define DEBUG_TYPE "asm-printer"
61 static cl::opt<bool> AlignCalls(
62 "hexagon-align-calls", cl::Hidden, cl::init(true),
63 cl::desc("Insert falign after call instruction for Hexagon target"));
65 HexagonAsmPrinter::HexagonAsmPrinter(TargetMachine &TM,
66 std::unique_ptr<MCStreamer> Streamer)
67 : AsmPrinter(TM, std::move(Streamer)), Subtarget(nullptr) {}
69 void HexagonAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
71 const MachineOperand &MO = MI->getOperand(OpNo);
73 switch (MO.getType()) {
74 default: llvm_unreachable ("<unknown operand type>");
75 case MachineOperand::MO_Register:
76 O << HexagonInstPrinter::getRegisterName(MO.getReg());
78 case MachineOperand::MO_Immediate:
81 case MachineOperand::MO_MachineBasicBlock:
82 MO.getMBB()->getSymbol()->print(O, MAI);
84 case MachineOperand::MO_ConstantPoolIndex:
85 GetCPISymbol(MO.getIndex())->print(O, MAI);
87 case MachineOperand::MO_GlobalAddress:
88 // Computing the address of a global symbol, not calling it.
89 getSymbol(MO.getGlobal())->print(O, MAI);
90 printOffset(MO.getOffset(), O);
96 // isBlockOnlyReachableByFallthrough - We need to override this since the
97 // default AsmPrinter does not print labels for any basic block that
98 // is only reachable by a fall through. That works for all cases except
99 // for the case in which the basic block is reachable by a fall through but
100 // through an indirect from a jump table. In this case, the jump table
101 // will contain a label not defined by AsmPrinter.
103 bool HexagonAsmPrinter::
104 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
105 if (MBB->hasAddressTaken()) {
108 return AsmPrinter::isBlockOnlyReachableByFallthrough(MBB);
112 /// PrintAsmOperand - Print out an operand for an inline asm expression.
114 bool HexagonAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
116 const char *ExtraCode,
118 // Does this asm operand have a single letter operand modifier?
119 if (ExtraCode && ExtraCode[0]) {
120 if (ExtraCode[1] != 0) return true; // Unknown modifier.
122 switch (ExtraCode[0]) {
124 // See if this is a generic print operand
125 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
126 case 'c': // Don't print "$" before a global var name or constant.
127 // Hexagon never has a prefix.
128 printOperand(MI, OpNo, OS);
130 case 'L': // Write second word of DImode reference.
131 // Verify that this operand has two consecutive registers.
132 if (!MI->getOperand(OpNo).isReg() ||
133 OpNo+1 == MI->getNumOperands() ||
134 !MI->getOperand(OpNo+1).isReg())
136 ++OpNo; // Return the high-part.
139 // Write 'i' if an integer constant, otherwise nothing. Used to print
141 if (MI->getOperand(OpNo).isImm())
147 printOperand(MI, OpNo, OS);
151 bool HexagonAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
152 unsigned OpNo, unsigned AsmVariant,
153 const char *ExtraCode,
155 if (ExtraCode && ExtraCode[0])
156 return true; // Unknown modifier.
158 const MachineOperand &Base = MI->getOperand(OpNo);
159 const MachineOperand &Offset = MI->getOperand(OpNo+1);
162 printOperand(MI, OpNo, O);
164 llvm_unreachable("Unimplemented");
166 if (Offset.isImm()) {
168 O << " + #" << Offset.getImm();
171 llvm_unreachable("Unimplemented");
177 /// printMachineInstruction -- Print out a single Hexagon MI in Darwin syntax to
178 /// the current output stream.
180 void HexagonAsmPrinter::EmitInstruction(const MachineInstr *MI) {
182 MCB.setOpcode(Hexagon::BUNDLE);
183 MCB.addOperand(MCOperand::createImm(0));
185 if (MI->isBundle()) {
186 const MachineBasicBlock* MBB = MI->getParent();
187 MachineBasicBlock::const_instr_iterator MII = MI->getIterator();
188 unsigned IgnoreCount = 0;
190 for (++MII; MII != MBB->instr_end() && MII->isInsideBundle(); ++MII) {
191 if (MII->getOpcode() == TargetOpcode::DBG_VALUE ||
192 MII->getOpcode() == TargetOpcode::IMPLICIT_DEF)
195 HexagonLowerToMC(&*MII, MCB, *this);
200 HexagonLowerToMC(MI, MCB, *this);
201 HexagonMCInstrInfo::padEndloop(MCB);
203 // Examine the packet and try to find instructions that can be converted
205 HexagonMCInstrInfo::tryCompound(*Subtarget->getInstrInfo(),
206 OutStreamer->getContext(), MCB);
207 // Examine the packet and convert pairs of instructions to duplex
208 // instructions when possible.
209 SmallVector<DuplexCandidate, 8> possibleDuplexes;
210 possibleDuplexes = HexagonMCInstrInfo::getDuplexPossibilties(
211 *Subtarget->getInstrInfo(), MCB);
212 HexagonMCShuffle(*Subtarget->getInstrInfo(), *Subtarget,
213 OutStreamer->getContext(), MCB, possibleDuplexes);
214 EmitToStreamer(*OutStreamer, MCB);
217 extern "C" void LLVMInitializeHexagonAsmPrinter() {
218 RegisterAsmPrinter<HexagonAsmPrinter> X(TheHexagonTarget);