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llvm-6502/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
Chris Lattner 74bfe21b50 Now that we have everything nicely factored (e.g. asmprinter is not 
doing global variable classification anymore) and hookized, sink almost
all target targets global variable emission code into AsmPrinter and out
of each target.

Some notes:

1. PIC16 does completely custom and crazy stuff, so it is not changed.
2. XCore has some custom handling for extra directives.  I'll look at it next.
3. This switches linux/ppc to use .globl instead of .global.  If .globl is
   actually wrong, let me know and I'll fix it.
4. This makes linux/ppc get a lot of random cases right which were obviously
   wrong before, it is probably now a bit healthier.
5. Blackfin will probably start getting .comm and other things that it didn't
   before.  If this is undesirable, it should explicitly opt out of these
   things by clearing the relevant fields of MCAsmInfo.

This leads to a nice diffstat:
 14 files changed, 127 insertions(+), 830 deletions(-)




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93858 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-19 05:38:33 +00:00

789 lines
27 KiB
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//===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
//
// 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 AT&T format assembly
// language. This printer is the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "X86AsmPrinter.h"
#include "X86ATTInstPrinter.h"
#include "X86IntelInstPrinter.h"
#include "X86MCInstLower.h"
#include "X86.h"
#include "X86COFF.h"
#include "X86COFFMachineModuleInfo.h"
#include "X86MachineFunctionInfo.h"
#include "X86TargetMachine.h"
#include "llvm/CallingConv.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
//===----------------------------------------------------------------------===//
// Primitive Helper Functions.
//===----------------------------------------------------------------------===//
void X86AsmPrinter::printMCInst(const MCInst *MI) {
if (MAI->getAssemblerDialect() == 0)
X86ATTInstPrinter(O, *MAI).printInstruction(MI);
else
X86IntelInstPrinter(O, *MAI).printInstruction(MI);
}
void X86AsmPrinter::PrintPICBaseSymbol() const {
// FIXME: Gross const cast hack.
X86AsmPrinter *AP = const_cast<X86AsmPrinter*>(this);
O << *X86MCInstLower(OutContext, 0, *AP).GetPICBaseSymbol();
}
void X86AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
unsigned FnAlign = MF.getAlignment();
const Function *F = MF.getFunction();
if (Subtarget->isTargetCygMing()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
COFFMMI.DecorateCygMingName(CurrentFnSym, OutContext, F,
*TM.getTargetData());
}
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
EmitAlignment(FnAlign, F);
switch (F->getLinkage()) {
default: llvm_unreachable("Unknown linkage type!");
case Function::InternalLinkage: // Symbols default to internal.
case Function::PrivateLinkage:
break;
case Function::DLLExportLinkage:
case Function::ExternalLinkage:
OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCStreamer::Global);
break;
case Function::LinkerPrivateLinkage:
case Function::LinkOnceAnyLinkage:
case Function::LinkOnceODRLinkage:
case Function::WeakAnyLinkage:
case Function::WeakODRLinkage:
if (Subtarget->isTargetDarwin()) {
OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCStreamer::Global);
O << MAI->getWeakDefDirective() << *CurrentFnSym << '\n';
} else if (Subtarget->isTargetCygMing()) {
OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCStreamer::Global);
O << "\t.linkonce discard\n";
} else {
O << "\t.weak\t" << *CurrentFnSym << '\n';
}
break;
}
printVisibility(CurrentFnSym, F->getVisibility());
if (Subtarget->isTargetELF()) {
O << "\t.type\t" << *CurrentFnSym << ",@function\n";
} else if (Subtarget->isTargetCygMing()) {
O << "\t.def\t " << *CurrentFnSym;
O << ";\t.scl\t" <<
(F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
<< ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
<< ";\t.endef\n";
}
O << *CurrentFnSym << ':';
if (VerboseAsm) {
O.PadToColumn(MAI->getCommentColumn());
O << MAI->getCommentString() << ' ';
WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
}
O << '\n';
// Add some workaround for linkonce linkage on Cygwin\MinGW
if (Subtarget->isTargetCygMing() &&
(F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
const Function *F = MF.getFunction();
this->MF = &MF;
CallingConv::ID CC = F->getCallingConv();
SetupMachineFunction(MF);
O << "\n\n";
if (Subtarget->isTargetCOFF()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
// Populate function information map. Don't want to populate
// non-stdcall or non-fastcall functions' information right now.
if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
COFFMMI.AddFunctionInfo(F, *MF.getInfo<X86MachineFunctionInfo>());
}
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// Print the 'header' of function
emitFunctionHeader(MF);
// Emit pre-function debug and/or EH information.
if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
DW->BeginFunction(&MF);
// Print out code for the function.
bool hasAnyRealCode = false;
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
EmitBasicBlockStart(I);
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
// Print the assembly for the instruction.
if (!II->isLabel())
hasAnyRealCode = true;
printMachineInstruction(II);
}
}
if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
// If the function is empty, then we need to emit *something*. Otherwise,
// the function's label might be associated with something that it wasn't
// meant to be associated with. We emit a noop in this situation.
// We are assuming inline asms are code.
O << "\tnop\n";
}
if (MAI->hasDotTypeDotSizeDirective())
O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
// Emit post-function debug information.
if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
DW->EndFunction(&MF);
// Print out jump tables referenced by the function.
EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
// We didn't modify anything.
return false;
}
/// printSymbolOperand - Print a raw symbol reference operand. This handles
/// jump tables, constant pools, global address and external symbols, all of
/// which print to a label with various suffixes for relocation types etc.
void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO) {
switch (MO.getType()) {
default: llvm_unreachable("unknown symbol type!");
case MachineOperand::MO_JumpTableIndex:
O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
<< MO.getIndex();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
<< MO.getIndex();
printOffset(MO.getOffset());
break;
case MachineOperand::MO_GlobalAddress: {
const GlobalValue *GV = MO.getGlobal();
MCSymbol *GVSym;
if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
GVSym = GetSymbolWithGlobalValueBase(GV, "$stub");
else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
else
GVSym = GetGlobalValueSymbol(GV);
if (Subtarget->isTargetCygMing()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
COFFMMI.DecorateCygMingName(GVSym, OutContext, GV, *TM.getTargetData());
}
// Handle dllimport linkage.
if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
if (StubSym == 0)
StubSym = GetGlobalValueSymbol(GV);
} else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
if (StubSym == 0)
StubSym = GetGlobalValueSymbol(GV);
} else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
if (StubSym == 0)
StubSym = GetGlobalValueSymbol(GV);
}
// If the name begins with a dollar-sign, enclose it in parens. We do this
// to avoid having it look like an integer immediate to the assembler.
if (GVSym->getName()[0] != '$')
O << *GVSym;
else
O << '(' << *GVSym << ')';
printOffset(MO.getOffset());
break;
}
case MachineOperand::MO_ExternalSymbol: {
const MCSymbol *SymToPrint;
if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
SmallString<128> TempNameStr;
TempNameStr += StringRef(MO.getSymbolName());
TempNameStr += StringRef("$stub");
const MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
const MCSymbol *&StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
if (StubSym == 0) {
TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
StubSym = OutContext.GetOrCreateSymbol(TempNameStr.str());
}
SymToPrint = StubSym;
} else {
SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName());
}
// If the name begins with a dollar-sign, enclose it in parens. We do this
// to avoid having it look like an integer immediate to the assembler.
if (SymToPrint->getName()[0] != '$')
O << *SymToPrint;
else
O << '(' << *SymToPrint << '(';
break;
}
}
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
break;
case X86II::MO_DARWIN_NONLAZY:
case X86II::MO_DLLIMPORT:
case X86II::MO_DARWIN_STUB:
// These affect the name of the symbol, not any suffix.
break;
case X86II::MO_GOT_ABSOLUTE_ADDRESS:
O << " + [.-";
PrintPICBaseSymbol();
O << ']';
break;
case X86II::MO_PIC_BASE_OFFSET:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
O << '-';
PrintPICBaseSymbol();
break;
case X86II::MO_TLSGD: O << "@TLSGD"; break;
case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
case X86II::MO_TPOFF: O << "@TPOFF"; break;
case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
case X86II::MO_GOT: O << "@GOT"; break;
case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
case X86II::MO_PLT: O << "@PLT"; break;
}
}
/// print_pcrel_imm - This is used to print an immediate value that ends up
/// being encoded as a pc-relative value. These print slightly differently, for
/// example, a $ is not emitted.
void X86AsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
const MachineOperand &MO = MI->getOperand(OpNo);
switch (MO.getType()) {
default: llvm_unreachable("Unknown pcrel immediate operand");
case MachineOperand::MO_Immediate:
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
O << *GetMBBSymbol(MO.getMBB()->getNumber());
return;
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
printSymbolOperand(MO);
return;
}
}
void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
const char *Modifier) {
const MachineOperand &MO = MI->getOperand(OpNo);
switch (MO.getType()) {
default: llvm_unreachable("unknown operand type!");
case MachineOperand::MO_Register: {
O << '%';
unsigned Reg = MO.getReg();
if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
EVT VT = (strcmp(Modifier+6,"64") == 0) ?
MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
Reg = getX86SubSuperRegister(Reg, VT);
}
O << X86ATTInstPrinter::getRegisterName(Reg);
return;
}
case MachineOperand::MO_Immediate:
O << '$' << MO.getImm();
return;
case MachineOperand::MO_JumpTableIndex:
case MachineOperand::MO_ConstantPoolIndex:
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol: {
O << '$';
printSymbolOperand(MO);
break;
}
}
}
void X86AsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
unsigned char value = MI->getOperand(Op).getImm();
assert(value <= 7 && "Invalid ssecc argument!");
switch (value) {
case 0: O << "eq"; break;
case 1: O << "lt"; break;
case 2: O << "le"; break;
case 3: O << "unord"; break;
case 4: O << "neq"; break;
case 5: O << "nlt"; break;
case 6: O << "nle"; break;
case 7: O << "ord"; break;
}
}
void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
const char *Modifier) {
const MachineOperand &BaseReg = MI->getOperand(Op);
const MachineOperand &IndexReg = MI->getOperand(Op+2);
const MachineOperand &DispSpec = MI->getOperand(Op+3);
// If we really don't want to print out (rip), don't.
bool HasBaseReg = BaseReg.getReg() != 0;
if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
BaseReg.getReg() == X86::RIP)
HasBaseReg = false;
// HasParenPart - True if we will print out the () part of the mem ref.
bool HasParenPart = IndexReg.getReg() || HasBaseReg;
if (DispSpec.isImm()) {
int DispVal = DispSpec.getImm();
if (DispVal || !HasParenPart)
O << DispVal;
} else {
assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
DispSpec.isJTI() || DispSpec.isSymbol());
printSymbolOperand(MI->getOperand(Op+3));
}
if (HasParenPart) {
assert(IndexReg.getReg() != X86::ESP &&
"X86 doesn't allow scaling by ESP");
O << '(';
if (HasBaseReg)
printOperand(MI, Op, Modifier);
if (IndexReg.getReg()) {
O << ',';
printOperand(MI, Op+2, Modifier);
unsigned ScaleVal = MI->getOperand(Op+1).getImm();
if (ScaleVal != 1)
O << ',' << ScaleVal;
}
O << ')';
}
}
void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
const char *Modifier) {
assert(isMem(MI, Op) && "Invalid memory reference!");
const MachineOperand &Segment = MI->getOperand(Op+4);
if (Segment.getReg()) {
printOperand(MI, Op+4, Modifier);
O << ':';
}
printLeaMemReference(MI, Op, Modifier);
}
void X86AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
const MachineBasicBlock *MBB) const {
if (!MAI->getSetDirective())
return;
// We don't need .set machinery if we have GOT-style relocations
if (Subtarget->isPICStyleGOT())
return;
O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
<< getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
O << *GetMBBSymbol(MBB->getNumber());
if (Subtarget->isPICStyleRIPRel())
O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << uid << '\n';
else {
O << '-';
PrintPICBaseSymbol();
O << '\n';
}
}
void X86AsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
PrintPICBaseSymbol();
O << '\n';
PrintPICBaseSymbol();
O << ':';
}
void X86AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
const MachineBasicBlock *MBB,
unsigned uid) const {
const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
O << JTEntryDirective << ' ';
if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
<< '_' << uid << "_set_" << MBB->getNumber();
} else if (Subtarget->isPICStyleGOT())
O << *GetMBBSymbol(MBB->getNumber()) << "@GOTOFF";
else
O << *GetMBBSymbol(MBB->getNumber());
}
bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
unsigned Reg = MO.getReg();
switch (Mode) {
default: return true; // Unknown mode.
case 'b': // Print QImode register
Reg = getX86SubSuperRegister(Reg, MVT::i8);
break;
case 'h': // Print QImode high register
Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
break;
case 'w': // Print HImode register
Reg = getX86SubSuperRegister(Reg, MVT::i16);
break;
case 'k': // Print SImode register
Reg = getX86SubSuperRegister(Reg, MVT::i32);
break;
case 'q': // Print DImode register
Reg = getX86SubSuperRegister(Reg, MVT::i64);
break;
}
O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
return false;
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNo);
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'a': // This is an address. Currently only 'i' and 'r' are expected.
if (MO.isImm()) {
O << MO.getImm();
return false;
}
if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
printSymbolOperand(MO);
return false;
}
if (MO.isReg()) {
O << '(';
printOperand(MI, OpNo);
O << ')';
return false;
}
return true;
case 'c': // Don't print "$" before a global var name or constant.
if (MO.isImm())
O << MO.getImm();
else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
printSymbolOperand(MO);
else
printOperand(MI, OpNo);
return false;
case 'A': // Print '*' before a register (it must be a register)
if (MO.isReg()) {
O << '*';
printOperand(MI, OpNo);
return false;
}
return true;
case 'b': // Print QImode register
case 'h': // Print QImode high register
case 'w': // Print HImode register
case 'k': // Print SImode register
case 'q': // Print DImode register
if (MO.isReg())
return printAsmMRegister(MO, ExtraCode[0]);
printOperand(MI, OpNo);
return false;
case 'P': // This is the operand of a call, treat specially.
print_pcrel_imm(MI, OpNo);
return false;
case 'n': // Negate the immediate or print a '-' before the operand.
// Note: this is a temporary solution. It should be handled target
// independently as part of the 'MC' work.
if (MO.isImm()) {
O << -MO.getImm();
return false;
}
O << '-';
}
}
printOperand(MI, OpNo);
return false;
}
bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo, unsigned AsmVariant,
const char *ExtraCode) {
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 'P': // Don't print @PLT, but do print as memory.
printMemReference(MI, OpNo, "no-rip");
return false;
}
}
printMemReference(MI, OpNo);
return false;
}
/// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
/// AT&T syntax to the current output stream.
///
void X86AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
processDebugLoc(MI, true);
printInstructionThroughMCStreamer(MI);
if (VerboseAsm)
EmitComments(*MI);
O << '\n';
processDebugLoc(MI, false);
}
void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
if (Subtarget->isTargetDarwin()) {
// All darwin targets use mach-o.
TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs;
Stubs = MMIMacho.GetFnStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
5, SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
O << *Stubs[i].first << ":\n";
// Get the MCSymbol without the $stub suffix.
O << "\t.indirect_symbol " << *Stubs[i].second;
O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
}
O << '\n';
Stubs.clear();
}
// Output stubs for external and common global variables.
Stubs = MMIMacho.GetGVStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
TLOFMacho.getMachOSection("__IMPORT", "__pointers",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
O << *Stubs[i].first << ":\n\t.indirect_symbol " << *Stubs[i].second;
O << "\n\t.long\t0\n";
}
Stubs.clear();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
EmitAlignment(2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
O << *Stubs[i].first << ":\n" << MAI->getData32bitsDirective();
O << *Stubs[i].second << '\n';
}
Stubs.clear();
}
// 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(MCStreamer::SubsectionsViaSymbols);
}
if (Subtarget->isTargetCOFF()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
// Emit type information for external functions
for (X86COFFMachineModuleInfo::stub_iterator I = COFFMMI.stub_begin(),
E = COFFMMI.stub_end(); I != E; ++I) {
O << "\t.def\t " << I->getKeyData()
<< ";\t.scl\t" << COFF::C_EXT
<< ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
<< ";\t.endef\n";
}
if (Subtarget->isTargetCygMing()) {
// Necessary for dllexport support
std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
TargetLoweringObjectFileCOFF &TLOFCOFF =
static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->hasDLLExportLinkage()) {
MCSymbol *Sym = GetGlobalValueSymbol(I);
COFFMMI.DecorateCygMingName(Sym, OutContext, I, *TM.getTargetData());
DLLExportedFns.push_back(Sym);
}
for (Module::const_global_iterator I = M.global_begin(),
E = M.global_end(); I != E; ++I)
if (I->hasDLLExportLinkage())
DLLExportedGlobals.push_back(GetGlobalValueSymbol(I));
// Output linker support code for dllexported globals on windows.
if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
OutStreamer.SwitchSection(TLOFCOFF.getCOFFSection(".section .drectve",
true,
SectionKind::getMetadata()));
for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i)
O << "\t.ascii \" -export:" << *DLLExportedGlobals[i] << ",data\"\n";
for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i)
O << "\t.ascii \" -export:" << *DLLExportedFns[i] << "\"\n";
}
}
}
}
//===----------------------------------------------------------------------===//
// Target Registry Stuff
//===----------------------------------------------------------------------===//
static MCInstPrinter *createX86MCInstPrinter(const Target &T,
unsigned SyntaxVariant,
const MCAsmInfo &MAI,
raw_ostream &O) {
if (SyntaxVariant == 0)
return new X86ATTInstPrinter(O, MAI);
if (SyntaxVariant == 1)
return new X86IntelInstPrinter(O, MAI);
return 0;
}
// Force static initialization.
extern "C" void LLVMInitializeX86AsmPrinter() {
RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
TargetRegistry::RegisterMCInstPrinter(TheX86_32Target,createX86MCInstPrinter);
TargetRegistry::RegisterMCInstPrinter(TheX86_64Target,createX86MCInstPrinter);
}
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