| //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to the XAS-format XCore assembly language. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "asm-printer" |
| #include "XCore.h" |
| #include "XCoreInstrInfo.h" |
| #include "XCoreSubtarget.h" |
| #include "XCoreMCAsmInfo.h" |
| #include "XCoreTargetMachine.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineConstantPool.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/MachineJumpTableInfo.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Target/Mangler.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Target/TargetLoweringObjectFile.h" |
| #include "llvm/Target/TargetRegistry.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| #include <cctype> |
| using namespace llvm; |
| |
| static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional, |
| cl::desc("Maximum number of threads (for emulation thread-local storage)"), |
| cl::Hidden, |
| cl::value_desc("number"), |
| cl::init(8)); |
| |
| namespace { |
| class XCoreAsmPrinter : public AsmPrinter { |
| const XCoreSubtarget &Subtarget; |
| public: |
| explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()){} |
| |
| virtual const char *getPassName() const { |
| return "XCore Assembly Printer"; |
| } |
| |
| void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O); |
| void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, |
| const std::string &directive = ".jmptable"); |
| void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) { |
| printInlineJT(MI, opNum, O, ".jmptable32"); |
| } |
| void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O); |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &O); |
| |
| void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV); |
| virtual void EmitGlobalVariable(const GlobalVariable *GV); |
| |
| void printInstruction(const MachineInstr *MI, raw_ostream &O); // autogen'd. |
| static const char *getRegisterName(unsigned RegNo); |
| |
| void EmitFunctionEntryLabel(); |
| void EmitInstruction(const MachineInstr *MI); |
| void EmitFunctionBodyEnd(); |
| }; |
| } // end of anonymous namespace |
| |
| #include "XCoreGenAsmWriter.inc" |
| |
| void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) { |
| assert(((GV->hasExternalLinkage() || |
| GV->hasWeakLinkage()) || |
| GV->hasLinkOnceLinkage()) && "Unexpected linkage"); |
| if (const ArrayType *ATy = dyn_cast<ArrayType>( |
| cast<PointerType>(GV->getType())->getElementType())) { |
| OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global); |
| // FIXME: MCStreamerize. |
| OutStreamer.EmitRawText(StringRef(".globound")); |
| OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName())); |
| OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements())); |
| if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) { |
| // TODO Use COMDAT groups for LinkOnceLinkage |
| OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+ |
| ".globound"); |
| } |
| } |
| } |
| |
| void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (!GV->hasInitializer() || |
| EmitSpecialLLVMGlobal(GV)) |
| return; |
| |
| const TargetData *TD = TM.getTargetData(); |
| OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM)); |
| |
| |
| MCSymbol *GVSym = Mang->getSymbol(GV); |
| Constant *C = GV->getInitializer(); |
| unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType()); |
| |
| // Mark the start of the global |
| OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," + |
| GVSym->getName()); |
| |
| switch (GV->getLinkage()) { |
| case GlobalValue::AppendingLinkage: |
| report_fatal_error("AppendingLinkage is not supported by this target!"); |
| case GlobalValue::LinkOnceAnyLinkage: |
| case GlobalValue::LinkOnceODRLinkage: |
| case GlobalValue::WeakAnyLinkage: |
| case GlobalValue::WeakODRLinkage: |
| case GlobalValue::ExternalLinkage: |
| emitArrayBound(GVSym, GV); |
| OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); |
| |
| // TODO Use COMDAT groups for LinkOnceLinkage |
| if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) |
| OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak); |
| // FALL THROUGH |
| case GlobalValue::InternalLinkage: |
| case GlobalValue::PrivateLinkage: |
| break; |
| case GlobalValue::DLLImportLinkage: |
| llvm_unreachable("DLLImport linkage is not supported by this target!"); |
| case GlobalValue::DLLExportLinkage: |
| llvm_unreachable("DLLExport linkage is not supported by this target!"); |
| default: |
| llvm_unreachable("Unknown linkage type!"); |
| } |
| |
| EmitAlignment(Align > 2 ? Align : 2, GV); |
| |
| unsigned Size = TD->getTypeAllocSize(C->getType()); |
| if (GV->isThreadLocal()) { |
| Size *= MaxThreads; |
| } |
| if (MAI->hasDotTypeDotSizeDirective()) { |
| OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); |
| OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," + |
| Twine(Size)); |
| } |
| OutStreamer.EmitLabel(GVSym); |
| |
| EmitGlobalConstant(C); |
| if (GV->isThreadLocal()) { |
| for (unsigned i = 1; i < MaxThreads; ++i) |
| EmitGlobalConstant(C); |
| } |
| // The ABI requires that unsigned scalar types smaller than 32 bits |
| // are padded to 32 bits. |
| if (Size < 4) |
| OutStreamer.EmitZeros(4 - Size, 0); |
| |
| // Mark the end of the global |
| OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data"); |
| } |
| |
| /// EmitFunctionBodyEnd - Targets can override this to emit stuff after |
| /// the last basic block in the function. |
| void XCoreAsmPrinter::EmitFunctionBodyEnd() { |
| // Emit function end directives |
| OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) + |
| ".function"); |
| } |
| |
| void XCoreAsmPrinter::EmitFunctionEntryLabel() { |
| // Mark the start of the function |
| OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) + |
| ".function," + CurrentFnSym->getName()); |
| OutStreamer.EmitLabel(CurrentFnSym); |
| } |
| |
| void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum, |
| raw_ostream &O) { |
| printOperand(MI, opNum, O); |
| |
| if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0) |
| return; |
| |
| O << "+"; |
| printOperand(MI, opNum+1, O); |
| } |
| |
| void XCoreAsmPrinter:: |
| printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, |
| const std::string &directive) { |
| unsigned JTI = MI->getOperand(opNum).getIndex(); |
| const MachineFunction *MF = MI->getParent()->getParent(); |
| const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); |
| const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); |
| const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; |
| O << "\t" << directive << " "; |
| for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) { |
| MachineBasicBlock *MBB = JTBBs[i]; |
| if (i > 0) |
| O << ","; |
| O << *MBB->getSymbol(); |
| } |
| } |
| |
| void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum, |
| raw_ostream &O) { |
| const MachineOperand &MO = MI->getOperand(opNum); |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: |
| O << getRegisterName(MO.getReg()); |
| break; |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| break; |
| case MachineOperand::MO_MachineBasicBlock: |
| O << *MO.getMBB()->getSymbol(); |
| break; |
| case MachineOperand::MO_GlobalAddress: |
| O << *Mang->getSymbol(MO.getGlobal()); |
| break; |
| case MachineOperand::MO_ExternalSymbol: |
| O << MO.getSymbolName(); |
| break; |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| break; |
| case MachineOperand::MO_JumpTableIndex: |
| O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() |
| << '_' << MO.getIndex(); |
| break; |
| case MachineOperand::MO_BlockAddress: |
| O << *GetBlockAddressSymbol(MO.getBlockAddress()); |
| break; |
| default: |
| llvm_unreachable("not implemented"); |
| } |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant,const char *ExtraCode, |
| raw_ostream &O) { |
| printOperand(MI, OpNo, O); |
| return false; |
| } |
| |
| void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) { |
| SmallString<128> Str; |
| raw_svector_ostream O(Str); |
| |
| // Check for mov mnemonic |
| unsigned src, dst, srcSR, dstSR; |
| if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) { |
| O << "\tmov " << getRegisterName(dst) << ", "; |
| O << getRegisterName(src); |
| } else { |
| printInstruction(MI, O); |
| } |
| OutStreamer.EmitRawText(O.str()); |
| } |
| |
| // Force static initialization. |
| extern "C" void LLVMInitializeXCoreAsmPrinter() { |
| RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget); |
| } |