lib/Target/CellSPU/AsmPrinter/SPUAsmPrinter.cpp

   1 //===-- SPUAsmPrinter.cpp - Print machine instrs to Cell SPU assembly -------=//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains a printer that converts from our internal representation
  11 // of machine-dependent LLVM code to Cell SPU assembly language. This printer
  12 // is the output mechanism used by `llc'.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #define DEBUG_TYPE "asmprinter"
  17 #include "SPU.h"
  18 #include "SPUTargetMachine.h"
  19 #include "llvm/Constants.h"
  20 #include "llvm/DerivedTypes.h"
  21 #include "llvm/Module.h"
  22 #include "llvm/CodeGen/AsmPrinter.h"
  23 #include "llvm/CodeGen/MachineModuleInfo.h"
  24 #include "llvm/MC/MCStreamer.h"
  25 #include "llvm/MC/MCAsmInfo.h"
  26 #include "llvm/MC/MCSymbol.h"
  27 #include "llvm/Target/Mangler.h"
  28 #include "llvm/Target/TargetLoweringObjectFile.h"
  29 #include "llvm/Target/TargetInstrInfo.h"
  30 #include "llvm/Target/TargetOptions.h"
  31 #include "llvm/Target/TargetRegisterInfo.h"
  32 #include "llvm/Target/TargetRegistry.h"
  33 #include "llvm/ADT/SmallString.h"
  34 #include "llvm/ADT/StringExtras.h"
  35 #include "llvm/Support/ErrorHandling.h"
  36 #include "llvm/Support/raw_ostream.h"
  37 using namespace llvm;
  38
  39 namespace {
  40   class SPUAsmPrinter : public AsmPrinter {
  41   public:
  42     explicit SPUAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) :
  43       AsmPrinter(TM, Streamer) {}
  44
  45     virtual const char *getPassName() const {
  46       return "STI CBEA SPU Assembly Printer";
  47     }
  48
  49     /// printInstruction - This method is automatically generated by tablegen
  50     /// from the instruction set description.
  51     void printInstruction(const MachineInstr *MI, raw_ostream &OS);
  52     static const char *getRegisterName(unsigned RegNo);
  53
  54
  55     void EmitInstruction(const MachineInstr *MI) {
  56       SmallString<128> Str;
  57       raw_svector_ostream OS(Str);
  58       printInstruction(MI, OS);
  59       OutStreamer.EmitRawText(OS.str());
  60     }
  61     void printOp(const MachineOperand &MO, raw_ostream &OS);
  62
  63     void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
  64       const MachineOperand &MO = MI->getOperand(OpNo);
  65       if (MO.isReg()) {
  66         O << getRegisterName(MO.getReg());
  67       } else if (MO.isImm()) {
  68         O << MO.getImm();
  69       } else {
  70         printOp(MO, O);
  71       }
  72     }
  73
  74     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  75                          unsigned AsmVariant, const char *ExtraCode,
  76                          raw_ostream &O);
  77     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
  78                                unsigned AsmVariant, const char *ExtraCode,
  79                                raw_ostream &O);
  80
  81
  82     void
  83     printU7ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
  84     {
  85       unsigned int value = MI->getOperand(OpNo).getImm();
  86       assert(value < (1 << 8) && "Invalid u7 argument");
  87       O << value;
  88     }
  89
  90     void
  91     printShufAddr(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
  92     {
  93       char value = MI->getOperand(OpNo).getImm();
  94       O << (int) value;
  95       O << "(";
  96       printOperand(MI, OpNo+1, O);
  97       O << ")";
  98     }
  99
 100     void
 101     printS16ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 102     {
 103       O << (short) MI->getOperand(OpNo).getImm();
 104     }
 105
 106     void
 107     printU16ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 108     {
 109       O << (unsigned short)MI->getOperand(OpNo).getImm();
 110     }
 111
 112     void
 113     printMemRegReg(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 114       // When used as the base register, r0 reads constant zero rather than
 115       // the value contained in the register.  For this reason, the darwin
 116       // assembler requires that we print r0 as 0 (no r) when used as the base.
 117       const MachineOperand &MO = MI->getOperand(OpNo);
 118       O << getRegisterName(MO.getReg()) << ", ";
 119       printOperand(MI, OpNo+1, O);
 120     }
 121
 122     void
 123     printU18ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 124     {
 125       unsigned int value = MI->getOperand(OpNo).getImm();
 126       assert(value <= (1 << 19) - 1 && "Invalid u18 argument");
 127       O << value;
 128     }
 129
 130     void
 131     printS10ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 132     {
 133       short value = (short) (((int) MI->getOperand(OpNo).getImm() << 16)
 134                              >> 16);
 135       assert((value >= -(1 << 9) && value <= (1 << 9) - 1)
 136              && "Invalid s10 argument");
 137       O << value;
 138     }
 139
 140     void
 141     printU10ImmOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 142     {
 143       short value = (short) (((int) MI->getOperand(OpNo).getImm() << 16)
 144                              >> 16);
 145       assert((value <= (1 << 10) - 1) && "Invalid u10 argument");
 146       O << value;
 147     }
 148
 149     void
 150     printDFormAddr(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 151     {
 152       assert(MI->getOperand(OpNo).isImm() &&
 153              "printDFormAddr first operand is not immediate");
 154       int64_t value = int64_t(MI->getOperand(OpNo).getImm());
 155       int16_t value16 = int16_t(value);
 156       assert((value16 >= -(1 << (9+4)) && value16 <= (1 << (9+4)) - 1)
 157              && "Invalid dform s10 offset argument");
 158       O << (value16 & ~0xf) << "(";
 159       printOperand(MI, OpNo+1, O);
 160       O << ")";
 161     }
 162
 163     void
 164     printAddr256K(const MachineInstr *MI, unsigned OpNo, raw_ostream &O)
 165     {
 166       /* Note: operand 1 is an offset or symbol name. */
 167       if (MI->getOperand(OpNo).isImm()) {
 168         printS16ImmOperand(MI, OpNo, O);
 169       } else {
 170         printOp(MI->getOperand(OpNo), O);
 171         if (MI->getOperand(OpNo+1).isImm()) {
 172           int displ = int(MI->getOperand(OpNo+1).getImm());
 173           if (displ > 0)
 174             O << "+" << displ;
 175           else if (displ < 0)
 176             O << displ;
 177         }
 178       }
 179     }
 180
 181     void printCallOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 182       printOp(MI->getOperand(OpNo), O);
 183     }
 184
 185     void printPCRelativeOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 186       // Used to generate a ".-<target>", but it turns out that the assembler
 187       // really wants the target.
 188       //
 189       // N.B.: This operand is used for call targets. Branch hints are another
 190       // animal entirely.
 191       printOp(MI->getOperand(OpNo), O);
 192     }
 193
 194     void printSymbolHi(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 195       if (MI->getOperand(OpNo).isImm()) {
 196         printS16ImmOperand(MI, OpNo, O);
 197       } else {
 198         printOp(MI->getOperand(OpNo), O);
 199         O << "@h";
 200       }
 201     }
 202
 203     void printSymbolLo(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 204       if (MI->getOperand(OpNo).isImm()) {
 205         printS16ImmOperand(MI, OpNo, O);
 206       } else {
 207         printOp(MI->getOperand(OpNo), O);
 208         O << "@l";
 209       }
 210     }
 211
 212     /// Print local store address
 213     void printSymbolLSA(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
 214       printOp(MI->getOperand(OpNo), O);
 215     }
 216
 217     void printROTHNeg7Imm(const MachineInstr *MI, unsigned OpNo,
 218                           raw_ostream &O) {
 219       if (MI->getOperand(OpNo).isImm()) {
 220         int value = (int) MI->getOperand(OpNo).getImm();
 221         assert((value >= 0 && value < 16)
 222                && "Invalid negated immediate rotate 7-bit argument");
 223         O << -value;
 224       } else {
 225         llvm_unreachable("Invalid/non-immediate rotate amount in printRotateNeg7Imm");
 226       }
 227     }
 228
 229     void printROTNeg7Imm(const MachineInstr *MI, unsigned OpNo, raw_ostream &O){
 230       assert(MI->getOperand(OpNo).isImm() &&
 231              "Invalid/non-immediate rotate amount in printRotateNeg7Imm");
 232       int value = (int) MI->getOperand(OpNo).getImm();
 233       assert((value >= 0 && value <= 32)
 234              && "Invalid negated immediate rotate 7-bit argument");
 235       O << -value;
 236     }
 237   };
 238 } // end of anonymous namespace
 239
 240 // Include the auto-generated portion of the assembly writer
 241 #include "SPUGenAsmWriter.inc"
 242
 243 void SPUAsmPrinter::printOp(const MachineOperand &MO, raw_ostream &O) {
 244   switch (MO.getType()) {
 245   case MachineOperand::MO_Immediate:
 246     report_fatal_error("printOp() does not handle immediate values");
 247     return;
 248
 249   case MachineOperand::MO_MachineBasicBlock:
 250     O << *MO.getMBB()->getSymbol();
 251     return;
 252   case MachineOperand::MO_JumpTableIndex:
 253     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 254       << '_' << MO.getIndex();
 255     return;
 256   case MachineOperand::MO_ConstantPoolIndex:
 257     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
 258       << '_' << MO.getIndex();
 259     return;
 260   case MachineOperand::MO_ExternalSymbol:
 261     // Computing the address of an external symbol, not calling it.
 262     if (TM.getRelocationModel() != Reloc::Static) {
 263       O << "L" << MAI->getGlobalPrefix() << MO.getSymbolName()
 264         << "$non_lazy_ptr";
 265       return;
 266     }
 267     O << *GetExternalSymbolSymbol(MO.getSymbolName());
 268     return;
 269   case MachineOperand::MO_GlobalAddress:
 270     // External or weakly linked global variables need non-lazily-resolved
 271     // stubs
 272     if (TM.getRelocationModel() != Reloc::Static) {
 273       const GlobalValue *GV = MO.getGlobal();
 274       if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
 275             GV->hasLinkOnceLinkage() || GV->hasCommonLinkage()))) {
 276         O << *GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
 277         return;
 278       }
 279     }
 280     O << *Mang->getSymbol(MO.getGlobal());
 281     return;
 282   default:
 283     O << "<unknown operand type: " << MO.getType() << ">";
 284     return;
 285   }
 286 }
 287
 288 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 289 ///
 290 bool SPUAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 291                                     unsigned AsmVariant,
 292                                     const char *ExtraCode, raw_ostream &O) {
 293   // Does this asm operand have a single letter operand modifier?
 294   if (ExtraCode && ExtraCode[0]) {
 295     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 296
 297     switch (ExtraCode[0]) {
 298     default: return true;  // Unknown modifier.
 299     case 'L': // Write second word of DImode reference.
 300       // Verify that this operand has two consecutive registers.
 301       if (!MI->getOperand(OpNo).isReg() ||
 302           OpNo+1 == MI->getNumOperands() ||
 303           !MI->getOperand(OpNo+1).isReg())
 304         return true;
 305       ++OpNo;   // Return the high-part.
 306       break;
 307     }
 308   }
 309
 310   printOperand(MI, OpNo, O);
 311   return false;
 312 }
 313
 314 bool SPUAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 315                                           unsigned OpNo, unsigned AsmVariant,
 316                                           const char *ExtraCode,
 317                                           raw_ostream &O) {
 318   if (ExtraCode && ExtraCode[0])
 319     return true; // Unknown modifier.
 320   printMemRegReg(MI, OpNo, O);
 321   return false;
 322 }
 323
 324 // Force static initialization.
 325 extern "C" void LLVMInitializeCellSPUAsmPrinter() {
 326   RegisterAsmPrinter<SPUAsmPrinter> X(TheCellSPUTarget);
 327 }