662 lines
		
	
	
		
			23 KiB
		
	
	
	
		
			C++
		
	
	
	
			
		
		
	
	
			662 lines
		
	
	
		
			23 KiB
		
	
	
	
		
			C++
		
	
	
	
| //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
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| //
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| //                     The LLVM Compiler Infrastructure
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| //
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| // This file is distributed under the University of Illinois Open Source
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| // License. See LICENSE.TXT for details.
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| //
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| //===----------------------------------------------------------------------===//
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| //
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| // This file contains a printer that converts from our internal representation
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| // of machine-dependent LLVM code to X86 machine code.
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| //
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| //===----------------------------------------------------------------------===//
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| 
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| #include "X86AsmPrinter.h"
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| #include "InstPrinter/X86ATTInstPrinter.h"
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| #include "MCTargetDesc/X86BaseInfo.h"
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| #include "X86InstrInfo.h"
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| #include "X86MachineFunctionInfo.h"
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| #include "llvm/CodeGen/MachineConstantPool.h"
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| #include "llvm/CodeGen/MachineModuleInfoImpls.h"
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| #include "llvm/CodeGen/MachineValueType.h"
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| #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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| #include "llvm/IR/DebugInfo.h"
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| #include "llvm/IR/DerivedTypes.h"
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| #include "llvm/IR/Mangler.h"
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| #include "llvm/IR/Module.h"
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| #include "llvm/IR/Type.h"
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| #include "llvm/MC/MCAsmInfo.h"
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| #include "llvm/MC/MCCodeEmitter.h"
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| #include "llvm/MC/MCContext.h"
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| #include "llvm/MC/MCExpr.h"
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| #include "llvm/MC/MCSectionCOFF.h"
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| #include "llvm/MC/MCSectionMachO.h"
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| #include "llvm/MC/MCStreamer.h"
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| #include "llvm/MC/MCSymbol.h"
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| #include "llvm/Support/COFF.h"
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| #include "llvm/Support/Debug.h"
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| #include "llvm/Support/ErrorHandling.h"
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| #include "llvm/Support/TargetRegistry.h"
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| using namespace llvm;
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| 
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| //===----------------------------------------------------------------------===//
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| // Primitive Helper Functions.
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| //===----------------------------------------------------------------------===//
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| 
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| /// runOnMachineFunction - Emit the function body.
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| ///
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| bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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|   Subtarget = &MF.getSubtarget<X86Subtarget>();
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| 
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|   SMShadowTracker.startFunction(MF);
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|   CodeEmitter.reset(TM.getTarget().createMCCodeEmitter(
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|       *MF.getSubtarget().getInstrInfo(), *MF.getSubtarget().getRegisterInfo(),
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|       MF.getContext()));
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| 
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|   SetupMachineFunction(MF);
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| 
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|   if (Subtarget->isTargetCOFF()) {
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|     bool Local = MF.getFunction()->hasLocalLinkage();
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|     OutStreamer->BeginCOFFSymbolDef(CurrentFnSym);
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|     OutStreamer->EmitCOFFSymbolStorageClass(
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|         Local ? COFF::IMAGE_SYM_CLASS_STATIC : COFF::IMAGE_SYM_CLASS_EXTERNAL);
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|     OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
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|                                                << COFF::SCT_COMPLEX_TYPE_SHIFT);
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|     OutStreamer->EndCOFFSymbolDef();
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|   }
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| 
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|   // Emit the rest of the function body.
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|   EmitFunctionBody();
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| 
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|   // Emit the XRay table for this function.
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|   EmitXRayTable();
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| 
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|   // We didn't modify anything.
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|   return false;
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| }
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| 
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| /// printSymbolOperand - Print a raw symbol reference operand.  This handles
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| /// jump tables, constant pools, global address and external symbols, all of
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| /// which print to a label with various suffixes for relocation types etc.
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| static void printSymbolOperand(X86AsmPrinter &P, const MachineOperand &MO,
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|                                raw_ostream &O) {
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|   switch (MO.getType()) {
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|   default: llvm_unreachable("unknown symbol type!");
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|   case MachineOperand::MO_ConstantPoolIndex:
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|     P.GetCPISymbol(MO.getIndex())->print(O, P.MAI);
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|     P.printOffset(MO.getOffset(), O);
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|     break;
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|   case MachineOperand::MO_GlobalAddress: {
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|     const GlobalValue *GV = MO.getGlobal();
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| 
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|     MCSymbol *GVSym;
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|     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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|         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
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|       GVSym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
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|     else
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|       GVSym = P.getSymbol(GV);
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| 
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|     // Handle dllimport linkage.
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|     if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
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|       GVSym =
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|           P.OutContext.getOrCreateSymbol(Twine("__imp_") + GVSym->getName());
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| 
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|     if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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|         MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
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|       MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
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|       MachineModuleInfoImpl::StubValueTy &StubSym =
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|           P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
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|       if (!StubSym.getPointer())
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|         StubSym = MachineModuleInfoImpl::
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|           StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
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|     }
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| 
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|     // If the name begins with a dollar-sign, enclose it in parens.  We do this
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|     // to avoid having it look like an integer immediate to the assembler.
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|     if (GVSym->getName()[0] != '$')
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|       GVSym->print(O, P.MAI);
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|     else {
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|       O << '(';
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|       GVSym->print(O, P.MAI);
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|       O << ')';
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|     }
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|     P.printOffset(MO.getOffset(), O);
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|     break;
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|   }
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|   }
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| 
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|   switch (MO.getTargetFlags()) {
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|   default:
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|     llvm_unreachable("Unknown target flag on GV operand");
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|   case X86II::MO_NO_FLAG:    // No flag.
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|     break;
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|   case X86II::MO_DARWIN_NONLAZY:
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|   case X86II::MO_DLLIMPORT:
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|     // These affect the name of the symbol, not any suffix.
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|     break;
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|   case X86II::MO_GOT_ABSOLUTE_ADDRESS:
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|     O << " + [.-";
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|     P.MF->getPICBaseSymbol()->print(O, P.MAI);
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|     O << ']';
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|     break;
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|   case X86II::MO_PIC_BASE_OFFSET:
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|   case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
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|     O << '-';
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|     P.MF->getPICBaseSymbol()->print(O, P.MAI);
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|     break;
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|   case X86II::MO_TLSGD:     O << "@TLSGD";     break;
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|   case X86II::MO_TLSLD:     O << "@TLSLD";     break;
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|   case X86II::MO_TLSLDM:    O << "@TLSLDM";    break;
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|   case X86II::MO_GOTTPOFF:  O << "@GOTTPOFF";  break;
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|   case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
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|   case X86II::MO_TPOFF:     O << "@TPOFF";     break;
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|   case X86II::MO_DTPOFF:    O << "@DTPOFF";    break;
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|   case X86II::MO_NTPOFF:    O << "@NTPOFF";    break;
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|   case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break;
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|   case X86II::MO_GOTPCREL:  O << "@GOTPCREL";  break;
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|   case X86II::MO_GOT:       O << "@GOT";       break;
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|   case X86II::MO_GOTOFF:    O << "@GOTOFF";    break;
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|   case X86II::MO_PLT:       O << "@PLT";       break;
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|   case X86II::MO_TLVP:      O << "@TLVP";      break;
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|   case X86II::MO_TLVP_PIC_BASE:
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|     O << "@TLVP" << '-';
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|     P.MF->getPICBaseSymbol()->print(O, P.MAI);
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|     break;
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|   case X86II::MO_SECREL:    O << "@SECREL32";  break;
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|   }
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| }
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| 
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| static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
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|                          unsigned OpNo, raw_ostream &O,
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|                          const char *Modifier = nullptr, unsigned AsmVariant = 0);
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| 
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| /// printPCRelImm - This is used to print an immediate value that ends up
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| /// being encoded as a pc-relative value.  These print slightly differently, for
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| /// example, a $ is not emitted.
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| static void printPCRelImm(X86AsmPrinter &P, const MachineInstr *MI,
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|                           unsigned OpNo, raw_ostream &O) {
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|   const MachineOperand &MO = MI->getOperand(OpNo);
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|   switch (MO.getType()) {
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|   default: llvm_unreachable("Unknown pcrel immediate operand");
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|   case MachineOperand::MO_Register:
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|     // pc-relativeness was handled when computing the value in the reg.
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|     printOperand(P, MI, OpNo, O);
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|     return;
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|   case MachineOperand::MO_Immediate:
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|     O << MO.getImm();
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|     return;
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|   case MachineOperand::MO_GlobalAddress:
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|     printSymbolOperand(P, MO, O);
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|     return;
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|   }
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| }
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| 
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| static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
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|                          unsigned OpNo, raw_ostream &O, const char *Modifier,
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|                          unsigned AsmVariant) {
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|   const MachineOperand &MO = MI->getOperand(OpNo);
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|   switch (MO.getType()) {
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|   default: llvm_unreachable("unknown operand type!");
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|   case MachineOperand::MO_Register: {
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|     // FIXME: Enumerating AsmVariant, so we can remove magic number.
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|     if (AsmVariant == 0) O << '%';
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|     unsigned Reg = MO.getReg();
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|     if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
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|       unsigned Size = (strcmp(Modifier+6,"64") == 0) ? 64 :
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|                       (strcmp(Modifier+6,"32") == 0) ? 32 :
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|                       (strcmp(Modifier+6,"16") == 0) ? 16 : 8;
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|       Reg = getX86SubSuperRegister(Reg, Size);
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|     }
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|     O << X86ATTInstPrinter::getRegisterName(Reg);
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|     return;
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|   }
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| 
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|   case MachineOperand::MO_Immediate:
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|     if (AsmVariant == 0) O << '$';
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|     O << MO.getImm();
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|     return;
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| 
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|   case MachineOperand::MO_GlobalAddress: {
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|     if (AsmVariant == 0) O << '$';
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|     printSymbolOperand(P, MO, O);
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|     break;
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|   }
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|   }
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| }
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| 
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| static void printLeaMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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|                                  unsigned Op, raw_ostream &O,
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|                                  const char *Modifier = nullptr) {
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|   const MachineOperand &BaseReg  = MI->getOperand(Op+X86::AddrBaseReg);
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|   const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
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|   const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
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| 
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|   // If we really don't want to print out (rip), don't.
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|   bool HasBaseReg = BaseReg.getReg() != 0;
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|   if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
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|       BaseReg.getReg() == X86::RIP)
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|     HasBaseReg = false;
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| 
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|   // HasParenPart - True if we will print out the () part of the mem ref.
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|   bool HasParenPart = IndexReg.getReg() || HasBaseReg;
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| 
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|   switch (DispSpec.getType()) {
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|   default:
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|     llvm_unreachable("unknown operand type!");
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|   case MachineOperand::MO_Immediate: {
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|     int DispVal = DispSpec.getImm();
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|     if (DispVal || !HasParenPart)
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|       O << DispVal;
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|     break;
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|   }
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|   case MachineOperand::MO_GlobalAddress:
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|   case MachineOperand::MO_ConstantPoolIndex:
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|     printSymbolOperand(P, DispSpec, O);
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|   }
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| 
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|   if (Modifier && strcmp(Modifier, "H") == 0)
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|     O << "+8";
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| 
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|   if (HasParenPart) {
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|     assert(IndexReg.getReg() != X86::ESP &&
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|            "X86 doesn't allow scaling by ESP");
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| 
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|     O << '(';
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|     if (HasBaseReg)
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|       printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier);
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| 
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|     if (IndexReg.getReg()) {
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|       O << ',';
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|       printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier);
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|       unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
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|       if (ScaleVal != 1)
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|         O << ',' << ScaleVal;
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|     }
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|     O << ')';
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|   }
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| }
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| 
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| static void printMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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|                               unsigned Op, raw_ostream &O,
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|                               const char *Modifier = nullptr) {
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|   assert(isMem(*MI, Op) && "Invalid memory reference!");
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|   const MachineOperand &Segment = MI->getOperand(Op+X86::AddrSegmentReg);
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|   if (Segment.getReg()) {
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|     printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier);
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|     O << ':';
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|   }
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|   printLeaMemReference(P, MI, Op, O, Modifier);
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| }
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| 
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| static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI,
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|                                    unsigned Op, raw_ostream &O,
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|                                    const char *Modifier = nullptr,
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|                                    unsigned AsmVariant = 1) {
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|   const MachineOperand &BaseReg  = MI->getOperand(Op+X86::AddrBaseReg);
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|   unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
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|   const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
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|   const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
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|   const MachineOperand &SegReg   = MI->getOperand(Op+X86::AddrSegmentReg);
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| 
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|   // If this has a segment register, print it.
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|   if (SegReg.getReg()) {
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|     printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier, AsmVariant);
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|     O << ':';
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|   }
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| 
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|   O << '[';
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| 
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|   bool NeedPlus = false;
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|   if (BaseReg.getReg()) {
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|     printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier, AsmVariant);
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|     NeedPlus = true;
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|   }
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| 
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|   if (IndexReg.getReg()) {
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|     if (NeedPlus) O << " + ";
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|     if (ScaleVal != 1)
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|       O << ScaleVal << '*';
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|     printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier, AsmVariant);
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|     NeedPlus = true;
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|   }
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| 
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|   if (!DispSpec.isImm()) {
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|     if (NeedPlus) O << " + ";
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|     printOperand(P, MI, Op+X86::AddrDisp, O, Modifier, AsmVariant);
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|   } else {
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|     int64_t DispVal = DispSpec.getImm();
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|     if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
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|       if (NeedPlus) {
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|         if (DispVal > 0)
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|           O << " + ";
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|         else {
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|           O << " - ";
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|           DispVal = -DispVal;
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|         }
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|       }
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|       O << DispVal;
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|     }
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|   }
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|   O << ']';
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| }
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| 
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| static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
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|                               char Mode, raw_ostream &O) {
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|   unsigned Reg = MO.getReg();
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|   switch (Mode) {
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|   default: return true;  // Unknown mode.
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|   case 'b': // Print QImode register
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|     Reg = getX86SubSuperRegister(Reg, 8);
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|     break;
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|   case 'h': // Print QImode high register
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|     Reg = getX86SubSuperRegister(Reg, 8, true);
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|     break;
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|   case 'w': // Print HImode register
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|     Reg = getX86SubSuperRegister(Reg, 16);
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|     break;
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|   case 'k': // Print SImode register
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|     Reg = getX86SubSuperRegister(Reg, 32);
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|     break;
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|   case 'q':
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|     // Print 64-bit register names if 64-bit integer registers are available.
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|     // Otherwise, print 32-bit register names.
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|     Reg = getX86SubSuperRegister(Reg, P.getSubtarget().is64Bit() ? 64 : 32);
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|     break;
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|   }
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| 
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|   O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
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|   return false;
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| }
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| 
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| /// PrintAsmOperand - Print out an operand for an inline asm expression.
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| ///
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| bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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|                                     unsigned AsmVariant,
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|                                     const char *ExtraCode, raw_ostream &O) {
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|   // Does this asm operand have a single letter operand modifier?
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|   if (ExtraCode && ExtraCode[0]) {
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|     if (ExtraCode[1] != 0) return true; // Unknown modifier.
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| 
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|     const MachineOperand &MO = MI->getOperand(OpNo);
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| 
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|     switch (ExtraCode[0]) {
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|     default:
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|       // See if this is a generic print operand
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|       return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
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|     case 'a': // This is an address.  Currently only 'i' and 'r' are expected.
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|       switch (MO.getType()) {
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|       default:
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|         return true;
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|       case MachineOperand::MO_Immediate:
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|         O << MO.getImm();
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|         return false;
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|       case MachineOperand::MO_ConstantPoolIndex:
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|       case MachineOperand::MO_JumpTableIndex:
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|       case MachineOperand::MO_ExternalSymbol:
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|         llvm_unreachable("unexpected operand type!");
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|       case MachineOperand::MO_GlobalAddress:
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|         printSymbolOperand(*this, MO, O);
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|         if (Subtarget->isPICStyleRIPRel())
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|           O << "(%rip)";
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|         return false;
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|       case MachineOperand::MO_Register:
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|         O << '(';
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|         printOperand(*this, MI, OpNo, O);
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|         O << ')';
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|         return false;
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|       }
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| 
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|     case 'c': // Don't print "$" before a global var name or constant.
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|       switch (MO.getType()) {
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|       default:
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|         printOperand(*this, MI, OpNo, O);
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|         break;
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|       case MachineOperand::MO_Immediate:
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|         O << MO.getImm();
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|         break;
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|       case MachineOperand::MO_ConstantPoolIndex:
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|       case MachineOperand::MO_JumpTableIndex:
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|       case MachineOperand::MO_ExternalSymbol:
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|         llvm_unreachable("unexpected operand type!");
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|       case MachineOperand::MO_GlobalAddress:
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|         printSymbolOperand(*this, MO, O);
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|         break;
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|       }
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|       return false;
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| 
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|     case 'A': // Print '*' before a register (it must be a register)
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|       if (MO.isReg()) {
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|         O << '*';
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|         printOperand(*this, MI, OpNo, O);
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|         return false;
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|       }
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|       return true;
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| 
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|     case 'b': // Print QImode register
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|     case 'h': // Print QImode high register
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|     case 'w': // Print HImode register
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|     case 'k': // Print SImode register
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|     case 'q': // Print DImode register
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|       if (MO.isReg())
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|         return printAsmMRegister(*this, MO, ExtraCode[0], O);
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|       printOperand(*this, MI, OpNo, O);
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|       return false;
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| 
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|     case 'P': // This is the operand of a call, treat specially.
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|       printPCRelImm(*this, MI, OpNo, O);
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|       return false;
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| 
 | |
|     case 'n':  // Negate the immediate or print a '-' before the operand.
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|       // Note: this is a temporary solution. It should be handled target
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|       // independently as part of the 'MC' work.
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|       if (MO.isImm()) {
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|         O << -MO.getImm();
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|         return false;
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|       }
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|       O << '-';
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|     }
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|   }
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| 
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|   printOperand(*this, MI, OpNo, O, /*Modifier*/ nullptr, AsmVariant);
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|   return false;
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| }
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| 
 | |
| bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 | |
|                                           unsigned OpNo, unsigned AsmVariant,
 | |
|                                           const char *ExtraCode,
 | |
|                                           raw_ostream &O) {
 | |
|   if (AsmVariant) {
 | |
|     printIntelMemReference(*this, MI, OpNo, O);
 | |
|     return false;
 | |
|   }
 | |
| 
 | |
|   if (ExtraCode && ExtraCode[0]) {
 | |
|     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 | |
| 
 | |
|     switch (ExtraCode[0]) {
 | |
|     default: return true;  // Unknown modifier.
 | |
|     case 'b': // Print QImode register
 | |
|     case 'h': // Print QImode high register
 | |
|     case 'w': // Print HImode register
 | |
|     case 'k': // Print SImode register
 | |
|     case 'q': // Print SImode register
 | |
|       // These only apply to registers, ignore on mem.
 | |
|       break;
 | |
|     case 'H':
 | |
|       printMemReference(*this, MI, OpNo, O, "H");
 | |
|       return false;
 | |
|     case 'P': // Don't print @PLT, but do print as memory.
 | |
|       printMemReference(*this, MI, OpNo, O, "no-rip");
 | |
|       return false;
 | |
|     }
 | |
|   }
 | |
|   printMemReference(*this, MI, OpNo, O);
 | |
|   return false;
 | |
| }
 | |
| 
 | |
| void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
 | |
|   const Triple &TT = TM.getTargetTriple();
 | |
| 
 | |
|   if (TT.isOSBinFormatMachO())
 | |
|     OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
 | |
| 
 | |
|   if (TT.isOSBinFormatCOFF()) {
 | |
|     // Emit an absolute @feat.00 symbol.  This appears to be some kind of
 | |
|     // compiler features bitfield read by link.exe.
 | |
|     if (TT.getArch() == Triple::x86) {
 | |
|       MCSymbol *S = MMI->getContext().getOrCreateSymbol(StringRef("@feat.00"));
 | |
|       OutStreamer->BeginCOFFSymbolDef(S);
 | |
|       OutStreamer->EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
 | |
|       OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
 | |
|       OutStreamer->EndCOFFSymbolDef();
 | |
|       // According to the PE-COFF spec, the LSB of this value marks the object
 | |
|       // for "registered SEH".  This means that all SEH handler entry points
 | |
|       // must be registered in .sxdata.  Use of any unregistered handlers will
 | |
|       // cause the process to terminate immediately.  LLVM does not know how to
 | |
|       // register any SEH handlers, so its object files should be safe.
 | |
|       OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
 | |
|       OutStreamer->EmitAssignment(
 | |
|           S, MCConstantExpr::create(int64_t(1), MMI->getContext()));
 | |
|     }
 | |
|   }
 | |
|   OutStreamer->EmitSyntaxDirective();
 | |
| 
 | |
|   // If this is not inline asm and we're in 16-bit
 | |
|   // mode prefix assembly with .code16.
 | |
|   bool is16 = TT.getEnvironment() == Triple::CODE16;
 | |
|   if (M.getModuleInlineAsm().empty() && is16)
 | |
|     OutStreamer->EmitAssemblerFlag(MCAF_Code16);
 | |
| }
 | |
| 
 | |
| static void
 | |
| emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel,
 | |
|                          MachineModuleInfoImpl::StubValueTy &MCSym) {
 | |
|   // L_foo$stub:
 | |
|   OutStreamer.EmitLabel(StubLabel);
 | |
|   //   .indirect_symbol _foo
 | |
|   OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
 | |
| 
 | |
|   if (MCSym.getInt())
 | |
|     // External to current translation unit.
 | |
|     OutStreamer.EmitIntValue(0, 4/*size*/);
 | |
|   else
 | |
|     // Internal to current translation unit.
 | |
|     //
 | |
|     // When we place the LSDA into the TEXT section, the type info
 | |
|     // pointers need to be indirect and pc-rel. We accomplish this by
 | |
|     // using NLPs; however, sometimes the types are local to the file.
 | |
|     // We need to fill in the value for the NLP in those cases.
 | |
|     OutStreamer.EmitValue(
 | |
|         MCSymbolRefExpr::create(MCSym.getPointer(), OutStreamer.getContext()),
 | |
|         4 /*size*/);
 | |
| }
 | |
| 
 | |
| MCSymbol *X86AsmPrinter::GetCPISymbol(unsigned CPID) const {
 | |
|   if (Subtarget->isTargetKnownWindowsMSVC()) {
 | |
|     const MachineConstantPoolEntry &CPE =
 | |
|         MF->getConstantPool()->getConstants()[CPID];
 | |
|     if (!CPE.isMachineConstantPoolEntry()) {
 | |
|       const DataLayout &DL = MF->getDataLayout();
 | |
|       SectionKind Kind = CPE.getSectionKind(&DL);
 | |
|       const Constant *C = CPE.Val.ConstVal;
 | |
|       unsigned Align = CPE.Alignment;
 | |
|       if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
 | |
|               getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
 | |
|         if (MCSymbol *Sym = S->getCOMDATSymbol()) {
 | |
|           if (Sym->isUndefined())
 | |
|             OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
 | |
|           return Sym;
 | |
|         }
 | |
|       }
 | |
|     }
 | |
|   }
 | |
| 
 | |
|   return AsmPrinter::GetCPISymbol(CPID);
 | |
| }
 | |
| 
 | |
| void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
 | |
|   const Triple &TT = TM.getTargetTriple();
 | |
| 
 | |
|   if (TT.isOSBinFormatMachO()) {
 | |
|     // All darwin targets use mach-o.
 | |
|     MachineModuleInfoMachO &MMIMacho =
 | |
|         MMI->getObjFileInfo<MachineModuleInfoMachO>();
 | |
| 
 | |
|     // Output stubs for dynamically-linked functions.
 | |
|     MachineModuleInfoMachO::SymbolListTy Stubs;
 | |
| 
 | |
|     // Output stubs for external and common global variables.
 | |
|     Stubs = MMIMacho.GetGVStubList();
 | |
|     if (!Stubs.empty()) {
 | |
|       MCSection *TheSection = OutContext.getMachOSection(
 | |
|           "__IMPORT", "__pointers", MachO::S_NON_LAZY_SYMBOL_POINTERS,
 | |
|           SectionKind::getMetadata());
 | |
|       OutStreamer->SwitchSection(TheSection);
 | |
| 
 | |
|       for (auto &Stub : Stubs)
 | |
|         emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
 | |
| 
 | |
|       Stubs.clear();
 | |
|       OutStreamer->AddBlankLine();
 | |
|     }
 | |
| 
 | |
|     SM.serializeToStackMapSection();
 | |
|     FM.serializeToFaultMapSection();
 | |
| 
 | |
|     // Funny Darwin hack: This flag tells the linker that no global symbols
 | |
|     // contain code that falls through to other global symbols (e.g. the obvious
 | |
|     // implementation of multiple entry points).  If this doesn't occur, the
 | |
|     // linker can safely perform dead code stripping.  Since LLVM never
 | |
|     // generates code that does this, it is always safe to set.
 | |
|     OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
 | |
|   }
 | |
| 
 | |
|   if (TT.isKnownWindowsMSVCEnvironment() && MMI->usesVAFloatArgument()) {
 | |
|     StringRef SymbolName =
 | |
|         (TT.getArch() == Triple::x86_64) ? "_fltused" : "__fltused";
 | |
|     MCSymbol *S = MMI->getContext().getOrCreateSymbol(SymbolName);
 | |
|     OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
 | |
|   }
 | |
| 
 | |
|   if (TT.isOSBinFormatCOFF()) {
 | |
|     const TargetLoweringObjectFileCOFF &TLOFCOFF =
 | |
|         static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
 | |
| 
 | |
|     std::string Flags;
 | |
|     raw_string_ostream FlagsOS(Flags);
 | |
| 
 | |
|     for (const auto &Function : M)
 | |
|       TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Function);
 | |
|     for (const auto &Global : M.globals())
 | |
|       TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Global);
 | |
|     for (const auto &Alias : M.aliases())
 | |
|       TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Alias);
 | |
| 
 | |
|     FlagsOS.flush();
 | |
| 
 | |
|     // Output collected flags.
 | |
|     if (!Flags.empty()) {
 | |
|       OutStreamer->SwitchSection(TLOFCOFF.getDrectveSection());
 | |
|       OutStreamer->EmitBytes(Flags);
 | |
|     }
 | |
| 
 | |
|     SM.serializeToStackMapSection();
 | |
|   }
 | |
| 
 | |
|   if (TT.isOSBinFormatELF()) {
 | |
|     SM.serializeToStackMapSection();
 | |
|     FM.serializeToFaultMapSection();
 | |
|   }
 | |
| }
 | |
| 
 | |
| //===----------------------------------------------------------------------===//
 | |
| // Target Registry Stuff
 | |
| //===----------------------------------------------------------------------===//
 | |
| 
 | |
| // Force static initialization.
 | |
| extern "C" void LLVMInitializeX86AsmPrinter() {
 | |
|   RegisterAsmPrinter<X86AsmPrinter> X(getTheX86_32Target());
 | |
|   RegisterAsmPrinter<X86AsmPrinter> Y(getTheX86_64Target());
 | |
| }
 |