lib/Target/XCore/XCoreAsmPrinter.cpp

   1 //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
   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 the XAS-format XCore assembly language.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "asm-printer"
  16 #include "XCore.h"
  17 #include "XCoreInstrInfo.h"
  18 #include "XCoreSubtarget.h"
  19 #include "XCoreMCAsmInfo.h"
  20 #include "XCoreTargetMachine.h"
  21 #include "llvm/Constants.h"
  22 #include "llvm/DerivedTypes.h"
  23 #include "llvm/Module.h"
  24 #include "llvm/CodeGen/AsmPrinter.h"
  25 #include "llvm/CodeGen/MachineModuleInfo.h"
  26 #include "llvm/CodeGen/MachineFunctionPass.h"
  27 #include "llvm/CodeGen/MachineConstantPool.h"
  28 #include "llvm/CodeGen/MachineInstr.h"
  29 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  30 #include "llvm/MC/MCStreamer.h"
  31 #include "llvm/MC/MCSymbol.h"
  32 #include "llvm/Target/Mangler.h"
  33 #include "llvm/Target/TargetData.h"
  34 #include "llvm/Target/TargetLoweringObjectFile.h"
  35 #include "llvm/Target/TargetRegistry.h"
  36 #include "llvm/ADT/SmallString.h"
  37 #include "llvm/ADT/StringExtras.h"
  38 #include "llvm/Support/CommandLine.h"
  39 #include "llvm/Support/ErrorHandling.h"
  40 #include "llvm/Support/raw_ostream.h"
  41 #include <algorithm>
  42 #include <cctype>
  43 using namespace llvm;
  44
  45 static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
  46   cl::desc("Maximum number of threads (for emulation thread-local storage)"),
  47   cl::Hidden,
  48   cl::value_desc("number"),
  49   cl::init(8));
  50
  51 namespace {
  52   class XCoreAsmPrinter : public AsmPrinter {
  53     const XCoreSubtarget &Subtarget;
  54   public:
  55     explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
  56       : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()){}
  57
  58     virtual const char *getPassName() const {
  59       return "XCore Assembly Printer";
  60     }
  61
  62     void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
  63     void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
  64                        const std::string &directive = ".jmptable");
  65     void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
  66       printInlineJT(MI, opNum, O, ".jmptable32");
  67     }
  68     void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
  69     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  70                          unsigned AsmVariant, const char *ExtraCode,
  71                          raw_ostream &O);
  72
  73     void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
  74     virtual void EmitGlobalVariable(const GlobalVariable *GV);
  75
  76     void printInstruction(const MachineInstr *MI, raw_ostream &O); // autogen'd.
  77     static const char *getRegisterName(unsigned RegNo);
  78
  79     void EmitFunctionEntryLabel();
  80     void EmitInstruction(const MachineInstr *MI);
  81     void EmitFunctionBodyEnd();
  82   };
  83 } // end of anonymous namespace
  84
  85 #include "XCoreGenAsmWriter.inc"
  86
  87 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
  88   assert(((GV->hasExternalLinkage() ||
  89     GV->hasWeakLinkage()) ||
  90     GV->hasLinkOnceLinkage()) && "Unexpected linkage");
  91   if (const ArrayType *ATy = dyn_cast<ArrayType>(
  92     cast<PointerType>(GV->getType())->getElementType())) {
  93     OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
  94     // FIXME: MCStreamerize.
  95     OutStreamer.EmitRawText(StringRef(".globound"));
  96     OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName()));
  97     OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements()));
  98     if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
  99       // TODO Use COMDAT groups for LinkOnceLinkage
 100       OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+
 101                               ".globound");
 102     }
 103   }
 104 }
 105
 106 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
 107   // Check to see if this is a special global used by LLVM, if so, emit it.
 108   if (!GV->hasInitializer() ||
 109       EmitSpecialLLVMGlobal(GV))
 110     return;
 111
 112   const TargetData *TD = TM.getTargetData();
 113   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
 114
 115
 116   MCSymbol *GVSym = Mang->getSymbol(GV);
 117   Constant *C = GV->getInitializer();
 118   unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
 119
 120   // Mark the start of the global
 121   OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
 122                           GVSym->getName());
 123
 124   switch (GV->getLinkage()) {
 125   case GlobalValue::AppendingLinkage:
 126     report_fatal_error("AppendingLinkage is not supported by this target!");
 127   case GlobalValue::LinkOnceAnyLinkage:
 128   case GlobalValue::LinkOnceODRLinkage:
 129   case GlobalValue::WeakAnyLinkage:
 130   case GlobalValue::WeakODRLinkage:
 131   case GlobalValue::ExternalLinkage:
 132     emitArrayBound(GVSym, GV);
 133     OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
 134
 135     // TODO Use COMDAT groups for LinkOnceLinkage
 136     if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
 137       OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
 138     // FALL THROUGH
 139   case GlobalValue::InternalLinkage:
 140   case GlobalValue::PrivateLinkage:
 141     break;
 142   case GlobalValue::DLLImportLinkage:
 143     llvm_unreachable("DLLImport linkage is not supported by this target!");
 144   case GlobalValue::DLLExportLinkage:
 145     llvm_unreachable("DLLExport linkage is not supported by this target!");
 146   default:
 147     llvm_unreachable("Unknown linkage type!");
 148   }
 149
 150   EmitAlignment(Align > 2 ? Align : 2, GV);
 151
 152   unsigned Size = TD->getTypeAllocSize(C->getType());
 153   if (GV->isThreadLocal()) {
 154     Size *= MaxThreads;
 155   }
 156   if (MAI->hasDotTypeDotSizeDirective()) {
 157     OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
 158     OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
 159                             Twine(Size));
 160   }
 161   OutStreamer.EmitLabel(GVSym);
 162
 163   EmitGlobalConstant(C);
 164   if (GV->isThreadLocal()) {
 165     for (unsigned i = 1; i < MaxThreads; ++i)
 166       EmitGlobalConstant(C);
 167   }
 168   // The ABI requires that unsigned scalar types smaller than 32 bits
 169   // are padded to 32 bits.
 170   if (Size < 4)
 171     OutStreamer.EmitZeros(4 - Size, 0);
 172
 173   // Mark the end of the global
 174   OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
 175 }
 176
 177 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
 178 /// the last basic block in the function.
 179 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
 180   // Emit function end directives
 181   OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
 182                           ".function");
 183 }
 184
 185 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
 186   // Mark the start of the function
 187   OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
 188                           ".function," + CurrentFnSym->getName());
 189   OutStreamer.EmitLabel(CurrentFnSym);
 190 }
 191
 192 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
 193                                       raw_ostream &O) {
 194   printOperand(MI, opNum, O);
 195
 196   if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
 197     return;
 198
 199   O << "+";
 200   printOperand(MI, opNum+1, O);
 201 }
 202
 203 void XCoreAsmPrinter::
 204 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
 205               const std::string &directive) {
 206   unsigned JTI = MI->getOperand(opNum).getIndex();
 207   const MachineFunction *MF = MI->getParent()->getParent();
 208   const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
 209   const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
 210   const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
 211   O << "\t" << directive << " ";
 212   for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
 213     MachineBasicBlock *MBB = JTBBs[i];
 214     if (i > 0)
 215       O << ",";
 216     O << *MBB->getSymbol();
 217   }
 218 }
 219
 220 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
 221                                    raw_ostream &O) {
 222   const MachineOperand &MO = MI->getOperand(opNum);
 223   switch (MO.getType()) {
 224   case MachineOperand::MO_Register:
 225     O << getRegisterName(MO.getReg());
 226     break;
 227   case MachineOperand::MO_Immediate:
 228     O << MO.getImm();
 229     break;
 230   case MachineOperand::MO_MachineBasicBlock:
 231     O << *MO.getMBB()->getSymbol();
 232     break;
 233   case MachineOperand::MO_GlobalAddress:
 234     O << *Mang->getSymbol(MO.getGlobal());
 235     break;
 236   case MachineOperand::MO_ExternalSymbol:
 237     O << MO.getSymbolName();
 238     break;
 239   case MachineOperand::MO_ConstantPoolIndex:
 240     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
 241       << '_' << MO.getIndex();
 242     break;
 243   case MachineOperand::MO_JumpTableIndex:
 244     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 245       << '_' << MO.getIndex();
 246     break;
 247   case MachineOperand::MO_BlockAddress:
 248     O << *GetBlockAddressSymbol(MO.getBlockAddress());
 249     break;
 250   default:
 251     llvm_unreachable("not implemented");
 252   }
 253 }
 254
 255 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 256 ///
 257 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 258                                       unsigned AsmVariant,const char *ExtraCode,
 259                                       raw_ostream &O) {
 260   printOperand(MI, OpNo, O);
 261   return false;
 262 }
 263
 264 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
 265   SmallString<128> Str;
 266   raw_svector_ostream O(Str);
 267
 268   // Check for mov mnemonic
 269   if (MI->getOpcode() == XCore::ADD_2rus && !MI->getOperand(2).getImm())
 270     O << "\tmov " << getRegisterName(MI->getOperand(0).getReg()) << ", "
 271       << getRegisterName(MI->getOperand(1).getReg());
 272   else
 273     printInstruction(MI, O);
 274   OutStreamer.EmitRawText(O.str());
 275 }
 276
 277 // Force static initialization.
 278 extern "C" void LLVMInitializeXCoreAsmPrinter() {
 279   RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
 280 }