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llvm-6502/lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp
Chris Lattner db486a6d53 several major improvements to the sparc backend: support for weak linkage 
and PIC codegen.  Patch by Venkatraman Govindaraju!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81877 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-15 17:46:24 +00:00

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//===-- SparcAsmPrinter.cpp - Sparc LLVM assembly writer ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to GAS-format SPARC assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "Sparc.h"
#include "SparcInstrInfo.h"
#include "SparcTargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include <cctype>
#include <cstring>
#include <map>
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
class VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
/// We name each basic block in a Function with a unique number, so
/// that we can consistently refer to them later. This is cleared
/// at the beginning of each call to runOnMachineFunction().
///
typedef std::map<const Value *, unsigned> ValueMapTy;
ValueMapTy NumberForBB;
unsigned BBNumber;
public:
explicit SparcAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
const MCAsmInfo *T, bool V)
: AsmPrinter(O, TM, T, V), BBNumber(0) {}
virtual const char *getPassName() const {
return "Sparc Assembly Printer";
}
void PrintGlobalVariable(const GlobalVariable *GVar);
void printOperand(const MachineInstr *MI, int opNum);
void printMemOperand(const MachineInstr *MI, int opNum,
const char *Modifier = 0);
void printCCOperand(const MachineInstr *MI, int opNum);
void printInstruction(const MachineInstr *MI); // autogenerated.
static const char *getRegisterName(unsigned RegNo);
bool runOnMachineFunction(MachineFunction &F);
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 emitFunctionHeader(const MachineFunction &MF);
bool printGetPCX(const MachineInstr *MI, unsigned OpNo);
};
} // end of anonymous namespace
#include "SparcGenAsmWriter.inc"
/// runOnMachineFunction - This uses the printInstruction()
/// method to print assembly for each instruction.
///
bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
this->MF = &MF;
SetupMachineFunction(MF);
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// BBNumber is used here so that a given Printer will never give two
// BBs the same name. (If you have a better way, please let me know!)
O << "\n\n";
emitFunctionHeader(MF);
// Emit pre-function debug information.
DW->BeginFunction(&MF);
// Number each basic block so that we can consistently refer to them
// in PC-relative references.
// FIXME: Why not use the MBB numbers?
NumberForBB.clear();
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
NumberForBB[I->getBasicBlock()] = BBNumber++;
}
// 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()) {
EmitBasicBlockStart(I);
O << '\n';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
processDebugLoc(II->getDebugLoc());
printInstruction(II);
if (VerboseAsm && !II->getDebugLoc().isUnknown())
EmitComments(*II);
O << '\n';
++EmittedInsts;
}
}
// Emit post-function debug information.
DW->EndFunction(&MF);
// We didn't modify anything.
O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
return false;
}
void SparcAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
const Function *F = MF.getFunction();
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
EmitAlignment(MF.getAlignment(), F);
switch (F->getLinkage()) {
default: llvm_unreachable("Unknown linkage type");
case Function::PrivateLinkage:
case Function::InternalLinkage:
// Function is internal.
break;
case Function::DLLExportLinkage:
case Function::ExternalLinkage:
// Function is externally visible
O << "\t.global\t" << CurrentFnName << '\n';
break;
case Function::LinkerPrivateLinkage:
case Function::LinkOnceAnyLinkage:
case Function::LinkOnceODRLinkage:
case Function::WeakAnyLinkage:
case Function::WeakODRLinkage:
// Function is weak
O << "\t.weak\t" << CurrentFnName << '\n' ;
break;
}
printVisibility(CurrentFnName, F->getVisibility());
O << "\t.type\t" << CurrentFnName << ", #function\n";
O << CurrentFnName << ":\n";
}
void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
const MachineOperand &MO = MI->getOperand (opNum);
bool CloseParen = false;
if (MI->getOpcode() == SP::SETHIi && !MO.isReg() && !MO.isImm()) {
O << "%hi(";
CloseParen = true;
} else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) &&
!MO.isReg() && !MO.isImm()) {
O << "%lo(";
CloseParen = true;
}
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << "%" << LowercaseString(getRegisterName(MO.getReg()));
break;
case MachineOperand::MO_Immediate:
O << (int)MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
return;
case MachineOperand::MO_GlobalAddress:
O << Mang->getMangledName(MO.getGlobal());
break;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
<< MO.getIndex();
break;
default:
llvm_unreachable("<unknown operand type>");
}
if (CloseParen) O << ")";
}
void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
const char *Modifier) {
printOperand(MI, opNum);
// If this is an ADD operand, emit it like normal operands.
if (Modifier && !strcmp(Modifier, "arith")) {
O << ", ";
printOperand(MI, opNum+1);
return;
}
if (MI->getOperand(opNum+1).isReg() &&
MI->getOperand(opNum+1).getReg() == SP::G0)
return; // don't print "+%g0"
if (MI->getOperand(opNum+1).isImm() &&
MI->getOperand(opNum+1).getImm() == 0)
return; // don't print "+0"
O << "+";
if (MI->getOperand(opNum+1).isGlobal() ||
MI->getOperand(opNum+1).isCPI()) {
O << "%lo(";
printOperand(MI, opNum+1);
O << ")";
} else {
printOperand(MI, opNum+1);
}
}
bool SparcAsmPrinter::printGetPCX(const MachineInstr *MI, unsigned opNum) {
std::string operand = "";
const MachineOperand &MO = MI->getOperand(opNum);
switch (MO.getType()) {
default: assert(0 && "Operand is not a register ");
case MachineOperand::MO_Register:
assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Operand is not a physical register ");
operand = "%" + LowercaseString(getRegisterName(MO.getReg()));
break;
}
unsigned bbNum = NumberForBB[MI->getParent()->getBasicBlock()];
O << '\n' << ".LLGETPCH" << bbNum << ":\n";
O << "\tcall\t.LLGETPC" << bbNum << '\n' ;
O << "\t sethi\t"
<< "%hi(_GLOBAL_OFFSET_TABLE_+(.-.LLGETPCH" << bbNum << ")), "
<< operand << '\n' ;
O << ".LLGETPC" << bbNum << ":\n" ;
O << "\tor\t" << operand
<< ", %lo(_GLOBAL_OFFSET_TABLE_+(.-.LLGETPCH" << bbNum << ")), "
<< operand << '\n';
O << "\tadd\t" << operand << ", %o7, " << operand << '\n';
return true;
}
void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
int CC = (int)MI->getOperand(opNum).getImm();
O << SPARCCondCodeToString((SPCC::CondCodes)CC);
}
void SparcAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
const TargetData *TD = TM.getTargetData();
if (!GVar->hasInitializer())
return; // External global require no code
// Check to see if this is a special global used by LLVM, if so, emit it.
if (EmitSpecialLLVMGlobal(GVar))
return;
O << "\n\n";
std::string name = Mang->getMangledName(GVar);
Constant *C = GVar->getInitializer();
unsigned Size = TD->getTypeAllocSize(C->getType());
unsigned Align = TD->getPreferredAlignment(GVar);
printVisibility(name, GVar->getVisibility());
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
TM));
if (C->isNullValue() && !GVar->hasSection()) {
if (!GVar->isThreadLocal() &&
(GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (GVar->hasLocalLinkage())
O << "\t.local " << name << '\n';
O << MAI->getCOMMDirective() << name << ',' << Size;
if (MAI->getCOMMDirectiveTakesAlignment())
O << ',' << (1 << Align);
O << '\n';
return;
}
}
switch (GVar->getLinkage()) {
case GlobalValue::CommonLinkage:
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage: // FIXME: Verify correct for weak.
case GlobalValue::WeakODRLinkage: // FIXME: Verify correct for weak.
// Nonnull linkonce -> weak
O << "\t.weak " << name << '\n';
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 << MAI->getGlobalDirective() << name << '\n';
// FALL THROUGH
case GlobalValue::PrivateLinkage:
case GlobalValue::LinkerPrivateLinkage:
case GlobalValue::InternalLinkage:
break;
case GlobalValue::GhostLinkage:
llvm_unreachable("Should not have any unmaterialized functions!");
case GlobalValue::DLLImportLinkage:
llvm_unreachable("DLLImport linkage is not supported by this target!");
case GlobalValue::DLLExportLinkage:
llvm_unreachable("DLLExport linkage is not supported by this target!");
default:
llvm_unreachable("Unknown linkage type!");
}
EmitAlignment(Align, GVar);
if (MAI->hasDotTypeDotSizeDirective()) {
O << "\t.type " << name << ",#object\n";
O << "\t.size " << name << ',' << Size << '\n';
}
O << name << ":\n";
EmitGlobalConstant(C);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool SparcAsmPrinter::PrintAsmOperand(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 'r':
break;
}
}
printOperand(MI, OpNo);
return false;
}
bool SparcAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier
O << '[';
printMemOperand(MI, OpNo);
O << ']';
return false;
}
// Force static initialization.
extern "C" void LLVMInitializeSparcAsmPrinter() {
RegisterAsmPrinter<SparcAsmPrinter> X(TheSparcTarget);
}
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