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llvm-6502/lib/Target/PowerPC/PPCAsmPrinter.cpp
Nate Begeman 52a51e38dc Emit .set directives for jump table entries when possible, which reduces 
the number of relocations in object files, shrinkifying them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29650 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-12 21:29:52 +00:00

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//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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 PowerPC assembly language. This printer is
// the output mechanism used by `llc'.
//
// Documentation at http://developer.apple.com/documentation/DeveloperTools/
// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asmprinter"
#include "PPC.h"
#include "PPCTargetMachine.h"
#include "PPCSubtarget.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineDebugInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Visibility.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include <iostream>
#include <set>
using namespace llvm;
namespace {
Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
public:
std::set<std::string> FnStubs, GVStubs;
PPCAsmPrinter(std::ostream &O, TargetMachine &TM)
: AsmPrinter(O, TM) {}
virtual const char *getPassName() const {
return "PowerPC Assembly Printer";
}
PPCTargetMachine &getTM() {
return static_cast<PPCTargetMachine&>(TM);
}
unsigned enumRegToMachineReg(unsigned enumReg) {
switch (enumReg) {
default: assert(0 && "Unhandled register!"); break;
case PPC::CR0: return 0;
case PPC::CR1: return 1;
case PPC::CR2: return 2;
case PPC::CR3: return 3;
case PPC::CR4: return 4;
case PPC::CR5: return 5;
case PPC::CR6: return 6;
case PPC::CR7: return 7;
}
abort();
}
/// printInstruction - This method is automatically generated by tablegen
/// from the instruction set description. This method returns true if the
/// machine instruction was sufficiently described to print it, otherwise it
/// returns false.
bool printInstruction(const MachineInstr *MI);
void printMachineInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO);
void printOperand(const MachineInstr *MI, unsigned OpNo) {
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.isRegister()) {
assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
} else if (MO.isImmediate()) {
O << MO.getImmedValue();
} else {
printOp(MO);
}
}
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode);
void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
char value = MI->getOperand(OpNo).getImmedValue();
value = (value << (32-5)) >> (32-5);
O << (int)value;
}
void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
unsigned char value = MI->getOperand(OpNo).getImmedValue();
assert(value <= 31 && "Invalid u5imm argument!");
O << (unsigned int)value;
}
void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
unsigned char value = MI->getOperand(OpNo).getImmedValue();
assert(value <= 63 && "Invalid u6imm argument!");
O << (unsigned int)value;
}
void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
O << (short)MI->getOperand(OpNo).getImmedValue();
}
void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
}
void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
O << (short)(MI->getOperand(OpNo).getImmedValue()*4);
}
void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
// Branches can take an immediate operand. This is used by the branch
// selection pass to print $+8, an eight byte displacement from the PC.
if (MI->getOperand(OpNo).isImmediate()) {
O << "$+" << MI->getOperand(OpNo).getImmedValue();
} else {
printOp(MI->getOperand(OpNo));
}
}
void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
const MachineOperand &MO = MI->getOperand(OpNo);
if (TM.getRelocationModel() != Reloc::Static) {
if (MO.getType() == MachineOperand::MO_GlobalAddress) {
GlobalValue *GV = MO.getGlobal();
if (((GV->isExternal() || GV->hasWeakLinkage() ||
GV->hasLinkOnceLinkage()))) {
// Dynamically-resolved functions need a stub for the function.
std::string Name = Mang->getValueName(GV);
FnStubs.insert(Name);
O << "L" << Name << "$stub";
return;
}
}
if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
std::string Name(GlobalPrefix); Name += MO.getSymbolName();
FnStubs.insert(Name);
O << "L" << Name << "$stub";
return;
}
}
printOp(MI->getOperand(OpNo));
}
void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
O << (int)MI->getOperand(OpNo).getImmedValue()*4;
}
void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
O << "\"L" << getFunctionNumber() << "$pb\"\n";
O << "\"L" << getFunctionNumber() << "$pb\":";
}
void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
if (MI->getOperand(OpNo).isImmediate()) {
printS16ImmOperand(MI, OpNo);
} else {
O << "ha16(";
printOp(MI->getOperand(OpNo));
if (TM.getRelocationModel() == Reloc::PIC_)
O << "-\"L" << getFunctionNumber() << "$pb\")";
else
O << ')';
}
}
void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
if (MI->getOperand(OpNo).isImmediate()) {
printS16ImmOperand(MI, OpNo);
} else {
O << "lo16(";
printOp(MI->getOperand(OpNo));
if (TM.getRelocationModel() == Reloc::PIC_)
O << "-\"L" << getFunctionNumber() << "$pb\")";
else
O << ')';
}
}
void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
unsigned CCReg = MI->getOperand(OpNo).getReg();
unsigned RegNo = enumRegToMachineReg(CCReg);
O << (0x80 >> RegNo);
}
// The new addressing mode printers.
void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
printSymbolLo(MI, OpNo);
O << '(';
if (MI->getOperand(OpNo+1).isRegister() &&
MI->getOperand(OpNo+1).getReg() == PPC::R0)
O << "0";
else
printOperand(MI, OpNo+1);
O << ')';
}
void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
if (MI->getOperand(OpNo).isImmediate())
printS16X4ImmOperand(MI, OpNo);
else
printSymbolLo(MI, OpNo);
O << '(';
if (MI->getOperand(OpNo+1).isRegister() &&
MI->getOperand(OpNo+1).getReg() == PPC::R0)
O << "0";
else
printOperand(MI, OpNo+1);
O << ')';
}
void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
// When used as the base register, r0 reads constant zero rather than
// the value contained in the register. For this reason, the darwin
// assembler requires that we print r0 as 0 (no r) when used as the base.
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.getReg() == PPC::R0)
O << '0';
else
O << TM.getRegisterInfo()->get(MO.getReg()).Name;
O << ", ";
printOperand(MI, OpNo+1);
}
virtual bool runOnMachineFunction(MachineFunction &F) = 0;
virtual bool doFinalization(Module &M) = 0;
};
/// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
///
struct VISIBILITY_HIDDEN DarwinDwarfWriter : public DwarfWriter {
// Ctor.
DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap)
: DwarfWriter(o, ap)
{
needsSet = true;
DwarfAbbrevSection = ".section __DWARF,__debug_abbrev";
DwarfInfoSection = ".section __DWARF,__debug_info";
DwarfLineSection = ".section __DWARF,__debug_line";
DwarfFrameSection = ".section __DWARF,__debug_frame";
DwarfPubNamesSection = ".section __DWARF,__debug_pubnames";
DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes";
DwarfStrSection = ".section __DWARF,__debug_str";
DwarfLocSection = ".section __DWARF,__debug_loc";
DwarfARangesSection = ".section __DWARF,__debug_aranges";
DwarfRangesSection = ".section __DWARF,__debug_ranges";
DwarfMacInfoSection = ".section __DWARF,__debug_macinfo";
TextSection = ".text";
DataSection = ".data";
}
};
/// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
/// X
struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter {
DarwinDwarfWriter DW;
DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM)
: PPCAsmPrinter(O, TM), DW(O, this) {
bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
CommentString = ";";
GlobalPrefix = "_";
PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
SetDirective = "\t.set";
if (isPPC64)
Data64bitsDirective = ".quad\t"; // we can't emit a 64-bit unit
else
Data64bitsDirective = 0; // we can't emit a 64-bit unit
AlignmentIsInBytes = false; // Alignment is by power of 2.
ConstantPoolSection = "\t.const\t";
JumpTableDataSection = ".const";
JumpTableTextSection = "\t.text";
LCOMMDirective = "\t.lcomm\t";
StaticCtorsSection = ".mod_init_func";
StaticDtorsSection = ".mod_term_func";
InlineAsmStart = "# InlineAsm Start";
InlineAsmEnd = "# InlineAsm End";
}
virtual const char *getPassName() const {
return "Darwin PPC Assembly Printer";
}
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<MachineDebugInfo>();
PPCAsmPrinter::getAnalysisUsage(AU);
}
};
} // end of anonymous namespace
/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly
/// code for a MachineFunction to the given output stream, in a format that the
/// Darwin assembler can deal with.
///
FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o,
PPCTargetMachine &tm) {
return new DarwinAsmPrinter(o, tm);
}
// Include the auto-generated portion of the assembly writer
#include "PPCGenAsmWriter.inc"
void PPCAsmPrinter::printOp(const MachineOperand &MO) {
switch (MO.getType()) {
case MachineOperand::MO_Immediate:
std::cerr << "printOp() does not handle immediate values\n";
abort();
return;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMachineBasicBlock());
return;
case MachineOperand::MO_JumpTableIndex:
O << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
<< '_' << MO.getJumpTableIndex();
// FIXME: PIC relocation model
return;
case MachineOperand::MO_ConstantPoolIndex:
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
<< '_' << MO.getConstantPoolIndex();
return;
case MachineOperand::MO_ExternalSymbol:
// Computing the address of an external symbol, not calling it.
if (TM.getRelocationModel() != Reloc::Static) {
std::string Name(GlobalPrefix); Name += MO.getSymbolName();
GVStubs.insert(Name);
O << "L" << Name << "$non_lazy_ptr";
return;
}
O << GlobalPrefix << MO.getSymbolName();
return;
case MachineOperand::MO_GlobalAddress: {
// Computing the address of a global symbol, not calling it.
GlobalValue *GV = MO.getGlobal();
std::string Name = Mang->getValueName(GV);
int offset = MO.getOffset();
// External or weakly linked global variables need non-lazily-resolved stubs
if (TM.getRelocationModel() != Reloc::Static) {
if (((GV->isExternal() || GV->hasWeakLinkage() ||
GV->hasLinkOnceLinkage()))) {
GVStubs.insert(Name);
O << "L" << Name << "$non_lazy_ptr";
return;
}
}
O << Name;
return;
}
default:
O << "<unknown operand type: " << MO.getType() << ">";
return;
}
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool PPCAsmPrinter::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.
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'L': // Write second word of DImode reference.
// Verify that this operand has two consecutive registers.
if (!MI->getOperand(OpNo).isRegister() ||
OpNo+1 == MI->getNumOperands() ||
!MI->getOperand(OpNo+1).isRegister())
return true;
++OpNo; // Return the high-part.
break;
}
}
printOperand(MI, OpNo);
return false;
}
bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
printMemRegReg(MI, OpNo);
return false;
}
/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
/// the current output stream.
///
void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Check for slwi/srwi mnemonics.
if (MI->getOpcode() == PPC::RLWINM) {
bool FoundMnemonic = false;
unsigned char SH = MI->getOperand(2).getImmedValue();
unsigned char MB = MI->getOperand(3).getImmedValue();
unsigned char ME = MI->getOperand(4).getImmedValue();
if (SH <= 31 && MB == 0 && ME == (31-SH)) {
O << "slwi "; FoundMnemonic = true;
}
if (SH <= 31 && MB == (32-SH) && ME == 31) {
O << "srwi "; FoundMnemonic = true;
SH = 32-SH;
}
if (FoundMnemonic) {
printOperand(MI, 0);
O << ", ";
printOperand(MI, 1);
O << ", " << (unsigned int)SH << "\n";
return;
}
} else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
O << "mr ";
printOperand(MI, 0);
O << ", ";
printOperand(MI, 1);
O << "\n";
return;
}
}
if (printInstruction(MI))
return; // Printer was automatically generated
assert(0 && "Unhandled instruction in asm writer!");
abort();
return;
}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// Print out jump tables referenced by the function
EmitJumpTableInfo(MF.getJumpTableInfo());
// Print out labels for the function.
const Function *F = MF.getFunction();
switch (F->getLinkage()) {
default: assert(0 && "Unknown linkage type!");
case Function::InternalLinkage: // Symbols default to internal.
SwitchToTextSection("\t.text", F);
break;
case Function::ExternalLinkage:
SwitchToTextSection("\t.text", F);
O << "\t.globl\t" << CurrentFnName << "\n";
break;
case Function::WeakLinkage:
case Function::LinkOnceLinkage:
SwitchToTextSection(
".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F);
O << "\t.globl\t" << CurrentFnName << "\n";
O << "\t.weak_definition\t" << CurrentFnName << "\n";
break;
}
EmitAlignment(4, F);
O << CurrentFnName << ":\n";
// Emit pre-function debug information.
DW.BeginFunction(&MF);
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
if (I != MF.begin()) {
printBasicBlockLabel(I, true);
O << '\n';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
O << "\t";
printMachineInstruction(II);
}
}
// Emit post-function debug information.
DW.EndFunction();
// We didn't modify anything.
return false;
}
bool DarwinAsmPrinter::doInitialization(Module &M) {
if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor())
O << "\t.machine ppc970\n";
AsmPrinter::doInitialization(M);
// Darwin wants symbols to be quoted if they have complex names.
Mang->setUseQuotes(true);
// Emit initial debug information.
DW.BeginModule(&M);
return false;
}
bool DarwinAsmPrinter::doFinalization(Module &M) {
const TargetData *TD = TM.getTargetData();
// Print out module-level global variables here.
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (!I->hasInitializer()) continue; // External global require no code
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(I))
continue;
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();
unsigned Size = TD->getTypeSize(C->getType());
unsigned Align = getPreferredAlignmentLog(I);
if (C->isNullValue() && /* FIXME: Verify correct */
(I->hasInternalLinkage() || I->hasWeakLinkage() ||
I->hasLinkOnceLinkage() ||
(I->hasExternalLinkage() && !I->hasSection()))) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (I->hasExternalLinkage()) {
O << "\t.globl " << name << '\n';
O << "\t.zerofill __DATA, __common, " << name << ", "
<< Size << ", " << Align;
} else if (I->hasInternalLinkage()) {
SwitchToDataSection("\t.data", I);
O << LCOMMDirective << name << "," << Size << "," << Align;
} else {
SwitchToDataSection("\t.data", I);
O << ".comm " << name << "," << Size;
}
O << "\t\t; '" << I->getName() << "'\n";
} else {
switch (I->getLinkage()) {
case GlobalValue::LinkOnceLinkage:
case GlobalValue::WeakLinkage:
O << "\t.globl " << name << '\n'
<< "\t.weak_definition " << name << '\n';
SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I);
break;
case GlobalValue::AppendingLinkage:
// FIXME: appending linkage variables should go into a section of
// their name or something. For now, just emit them as external.
case GlobalValue::ExternalLinkage:
// If external or appending, declare as a global symbol
O << "\t.globl " << name << "\n";
// FALL THROUGH
case GlobalValue::InternalLinkage:
SwitchToDataSection("\t.data", I);
break;
default:
std::cerr << "Unknown linkage type!";
abort();
}
EmitAlignment(Align, I);
O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
EmitGlobalConstant(C);
O << '\n';
}
}
bool isPPC64 = TD->getPointerSizeInBits() == 64;
// Output stubs for dynamically-linked functions
if (TM.getRelocationModel() == Reloc::PIC_) {
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
i != e; ++i) {
SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
"pure_instructions,32", 0);
EmitAlignment(4);
O << "L" << *i << "$stub:\n";
O << "\t.indirect_symbol " << *i << "\n";
O << "\tmflr r0\n";
O << "\tbcl 20,31,L0$" << *i << "\n";
O << "L0$" << *i << ":\n";
O << "\tmflr r11\n";
O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
O << "\tmtlr r0\n";
if (isPPC64)
O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
else
O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
O << "\tmtctr r12\n";
O << "\tbctr\n";
SwitchToDataSection(".lazy_symbol_pointer", 0);
O << "L" << *i << "$lazy_ptr:\n";
O << "\t.indirect_symbol " << *i << "\n";
if (isPPC64)
O << "\t.quad dyld_stub_binding_helper\n";
else
O << "\t.long dyld_stub_binding_helper\n";
}
} else {
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
i != e; ++i) {
SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
"pure_instructions,16", 0);
EmitAlignment(4);
O << "L" << *i << "$stub:\n";
O << "\t.indirect_symbol " << *i << "\n";
O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
if (isPPC64)
O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
else
O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
O << "\tmtctr r12\n";
O << "\tbctr\n";
SwitchToDataSection(".lazy_symbol_pointer", 0);
O << "L" << *i << "$lazy_ptr:\n";
O << "\t.indirect_symbol " << *i << "\n";
if (isPPC64)
O << "\t.quad dyld_stub_binding_helper\n";
else
O << "\t.long dyld_stub_binding_helper\n";
}
}
O << "\n";
// Output stubs for external and common global variables.
if (GVStubs.begin() != GVStubs.end()) {
SwitchToDataSection(".non_lazy_symbol_pointer", 0);
for (std::set<std::string>::iterator I = GVStubs.begin(),
E = GVStubs.end(); I != E; ++I) {
O << "L" << *I << "$non_lazy_ptr:\n";
O << "\t.indirect_symbol " << *I << "\n";
if (isPPC64)
O << "\t.quad\t0\n";
else
O << "\t.long\t0\n";
}
}
// Emit initial debug information.
DW.EndModule();
// 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.
O << "\t.subsections_via_symbols\n";
AsmPrinter::doFinalization(M);
return false; // success
}
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