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 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "asm-printer"
18 #include "HexagonAsmPrinter.h"
19 #include "HexagonMachineFunctionInfo.h"
20 #include "HexagonMCInst.h"
21 #include "HexagonTargetMachine.h"
22 #include "HexagonSubtarget.h"
23 #include "InstPrinter/HexagonInstPrinter.h"
24 #include "llvm/Constants.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/Module.h"
27 #include "llvm/Analysis/ConstantFolding.h"
28 #include "llvm/Assembly/Writer.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/CodeGen/MachineFunctionPass.h"
32 #include "llvm/CodeGen/MachineInstr.h"
33 #include "llvm/CodeGen/MachineInstrBuilder.h"
34 #include "llvm/MC/MCAsmInfo.h"
35 #include "llvm/MC/MCContext.h"
36 #include "llvm/MC/MCExpr.h"
37 #include "llvm/MC/MCInst.h"
38 #include "llvm/MC/MCSection.h"
39 #include "llvm/MC/MCStreamer.h"
40 #include "llvm/MC/MCSymbol.h"
41 #include "llvm/Support/MathExtras.h"
42 #include "llvm/Support/CommandLine.h"
43 #include "llvm/Support/Debug.h"
44 #include "llvm/Support/Compiler.h"
45 #include "llvm/Support/Format.h"
46 #include "llvm/Support/raw_ostream.h"
47 #include "llvm/Support/TargetRegistry.h"
48 #include "llvm/Target/Mangler.h"
49 #include "llvm/Target/TargetData.h"
50 #include "llvm/Target/TargetLoweringObjectFile.h"
51 #include "llvm/Target/TargetRegisterInfo.h"
52 #include "llvm/Target/TargetInstrInfo.h"
53 #include "llvm/Target/TargetOptions.h"
54 #include "llvm/ADT/SmallString.h"
55 #include "llvm/ADT/SmallVector.h"
56 #include "llvm/ADT/StringExtras.h"
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 void HexagonAsmPrinter::EmitAlignment(unsigned NumBits,
66 const GlobalValue *GV) const {
67 // For basic block level alignment, use ".falign".
69 OutStreamer.EmitRawText(StringRef("\t.falign"));
73 AsmPrinter::EmitAlignment(NumBits, GV);
76 void HexagonAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
78 const MachineOperand &MO = MI->getOperand(OpNo);
80 switch (MO.getType()) {
81 default: llvm_unreachable("<unknown operand type>");
82 case MachineOperand::MO_Register:
83 O << HexagonInstPrinter::getRegisterName(MO.getReg());
85 case MachineOperand::MO_Immediate:
88 case MachineOperand::MO_MachineBasicBlock:
89 O << *MO.getMBB()->getSymbol();
91 case MachineOperand::MO_JumpTableIndex:
92 O << *GetJTISymbol(MO.getIndex());
93 // FIXME: PIC relocation model.
95 case MachineOperand::MO_ConstantPoolIndex:
96 O << *GetCPISymbol(MO.getIndex());
98 case MachineOperand::MO_ExternalSymbol:
99 O << *GetExternalSymbolSymbol(MO.getSymbolName());
101 case MachineOperand::MO_GlobalAddress:
102 // Computing the address of a global symbol, not calling it.
103 O << *Mang->getSymbol(MO.getGlobal());
104 printOffset(MO.getOffset(), O);
110 // isBlockOnlyReachableByFallthrough - We need to override this since the
111 // default AsmPrinter does not print labels for any basic block that
112 // is only reachable by a fall through. That works for all cases except
113 // for the case in which the basic block is reachable by a fall through but
114 // through an indirect from a jump table. In this case, the jump table
115 // will contain a label not defined by AsmPrinter.
117 bool HexagonAsmPrinter::
118 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
119 if (MBB->hasAddressTaken()) {
122 return AsmPrinter::isBlockOnlyReachableByFallthrough(MBB);
126 /// PrintAsmOperand - Print out an operand for an inline asm expression.
128 bool HexagonAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
130 const char *ExtraCode,
132 // Does this asm operand have a single letter operand modifier?
133 if (ExtraCode && ExtraCode[0]) {
134 if (ExtraCode[1] != 0) return true; // Unknown modifier.
136 switch (ExtraCode[0]) {
137 default: return true; // Unknown modifier.
138 case 'c': // Don't print "$" before a global var name or constant.
139 // Hexagon never has a prefix.
140 printOperand(MI, OpNo, OS);
142 case 'L': // Write second word of DImode reference.
143 // Verify that this operand has two consecutive registers.
144 if (!MI->getOperand(OpNo).isReg() ||
145 OpNo+1 == MI->getNumOperands() ||
146 !MI->getOperand(OpNo+1).isReg())
148 ++OpNo; // Return the high-part.
151 // Write 'i' if an integer constant, otherwise nothing. Used to print
153 if (MI->getOperand(OpNo).isImm())
159 printOperand(MI, OpNo, OS);
163 bool HexagonAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
164 unsigned OpNo, unsigned AsmVariant,
165 const char *ExtraCode,
167 if (ExtraCode && ExtraCode[0])
168 return true; // Unknown modifier.
170 const MachineOperand &Base = MI->getOperand(OpNo);
171 const MachineOperand &Offset = MI->getOperand(OpNo+1);
174 printOperand(MI, OpNo, O);
176 llvm_unreachable("Unimplemented");
178 if (Offset.isImm()) {
180 O << " + #" << Offset.getImm();
183 llvm_unreachable("Unimplemented");
188 void HexagonAsmPrinter::printPredicateOperand(const MachineInstr *MI,
191 llvm_unreachable("Unimplemented");
195 /// printMachineInstruction -- Print out a single Hexagon MI in Darwin syntax to
196 /// the current output stream.
198 void HexagonAsmPrinter::EmitInstruction(const MachineInstr *MI) {
199 if (MI->isBundle()) {
200 std::vector<const MachineInstr*> BundleMIs;
202 const MachineBasicBlock *MBB = MI->getParent();
203 MachineBasicBlock::const_instr_iterator MII = MI;
205 unsigned int IgnoreCount = 0;
206 while (MII != MBB->end() && MII->isInsideBundle()) {
207 const MachineInstr *MInst = MII;
208 if (MInst->getOpcode() == TargetOpcode::DBG_VALUE ||
209 MInst->getOpcode() == TargetOpcode::IMPLICIT_DEF) {
214 //BundleMIs.push_back(&*MII);
215 BundleMIs.push_back(MInst);
218 unsigned Size = BundleMIs.size();
219 assert((Size+IgnoreCount) == MI->getBundleSize() && "Corrupt Bundle!");
220 for (unsigned Index = 0; Index < Size; Index++) {
222 MCI.setStartPacket(Index == 0);
223 MCI.setEndPacket(Index == (Size-1));
225 HexagonLowerToMC(BundleMIs[Index], MCI, *this);
226 OutStreamer.EmitInstruction(MCI);
231 if (MI->getOpcode() == Hexagon::ENDLOOP0) {
232 MCI.setStartPacket(true);
233 MCI.setEndPacket(true);
235 HexagonLowerToMC(MI, MCI, *this);
236 OutStreamer.EmitInstruction(MCI);
242 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
243 /// Don't print things like \n or \0.
244 // static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
245 // for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
246 // Name != E; ++Name)
247 // if (isprint(*Name))
252 void HexagonAsmPrinter::printAddrModeBasePlusOffset(const MachineInstr *MI,
253 int OpNo, raw_ostream &O) {
254 const MachineOperand &MO1 = MI->getOperand(OpNo);
255 const MachineOperand &MO2 = MI->getOperand(OpNo+1);
257 O << HexagonInstPrinter::getRegisterName(MO1.getReg())
263 void HexagonAsmPrinter::printGlobalOperand(const MachineInstr *MI, int OpNo,
265 const MachineOperand &MO = MI->getOperand(OpNo);
266 assert( (MO.getType() == MachineOperand::MO_GlobalAddress) &&
267 "Expecting global address");
269 O << *Mang->getSymbol(MO.getGlobal());
270 if (MO.getOffset() != 0) {
276 void HexagonAsmPrinter::printJumpTable(const MachineInstr *MI, int OpNo,
278 const MachineOperand &MO = MI->getOperand(OpNo);
279 assert( (MO.getType() == MachineOperand::MO_JumpTableIndex) &&
280 "Expecting jump table index");
282 // Hexagon_TODO: Do we need name mangling?
283 O << *GetJTISymbol(MO.getIndex());
286 void HexagonAsmPrinter::printConstantPool(const MachineInstr *MI, int OpNo,
288 const MachineOperand &MO = MI->getOperand(OpNo);
289 assert( (MO.getType() == MachineOperand::MO_ConstantPoolIndex) &&
290 "Expecting constant pool index");
292 // Hexagon_TODO: Do we need name mangling?
293 O << *GetCPISymbol(MO.getIndex());
296 static MCInstPrinter *createHexagonMCInstPrinter(const Target &T,
297 unsigned SyntaxVariant,
298 const MCAsmInfo &MAI,
299 const MCInstrInfo &MII,
300 const MCRegisterInfo &MRI,
301 const MCSubtargetInfo &STI) {
302 if (SyntaxVariant == 0)
303 return(new HexagonInstPrinter(MAI, MII, MRI));
308 extern "C" void LLVMInitializeHexagonAsmPrinter() {
309 RegisterAsmPrinter<HexagonAsmPrinter> X(TheHexagonTarget);
311 TargetRegistry::RegisterMCInstPrinter(TheHexagonTarget,
312 createHexagonMCInstPrinter);