llvm-6502/lib/Target/XCore/XCoreAsmPrinter.cpp
2011-06-19 18:37:11 +00:00

281 lines
9.8 KiB
C++

//===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to the XAS-format XCore assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "XCore.h"
#include "XCoreInstrInfo.h"
#include "XCoreSubtarget.h"
#include "XCoreMCAsmInfo.h"
#include "XCoreTargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cctype>
using namespace llvm;
static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
cl::desc("Maximum number of threads (for emulation thread-local storage)"),
cl::Hidden,
cl::value_desc("number"),
cl::init(8));
namespace {
class XCoreAsmPrinter : public AsmPrinter {
const XCoreSubtarget &Subtarget;
public:
explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()){}
virtual const char *getPassName() const {
return "XCore Assembly Printer";
}
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
const std::string &directive = ".jmptable");
void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
printInlineJT(MI, opNum, O, ".jmptable32");
}
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
virtual void EmitGlobalVariable(const GlobalVariable *GV);
void printInstruction(const MachineInstr *MI, raw_ostream &O); // autogen'd.
static const char *getRegisterName(unsigned RegNo);
void EmitFunctionEntryLabel();
void EmitInstruction(const MachineInstr *MI);
void EmitFunctionBodyEnd();
};
} // end of anonymous namespace
#include "XCoreGenAsmWriter.inc"
void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
assert(((GV->hasExternalLinkage() ||
GV->hasWeakLinkage()) ||
GV->hasLinkOnceLinkage()) && "Unexpected linkage");
if (const ArrayType *ATy = dyn_cast<ArrayType>(
cast<PointerType>(GV->getType())->getElementType())) {
OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
// FIXME: MCStreamerize.
OutStreamer.EmitRawText(StringRef(".globound"));
OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName()));
OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements()));
if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
// TODO Use COMDAT groups for LinkOnceLinkage
OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+
".globound");
}
}
}
void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
// Check to see if this is a special global used by LLVM, if so, emit it.
if (!GV->hasInitializer() ||
EmitSpecialLLVMGlobal(GV))
return;
const TargetData *TD = TM.getTargetData();
OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
MCSymbol *GVSym = Mang->getSymbol(GV);
const Constant *C = GV->getInitializer();
unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
// Mark the start of the global
OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
GVSym->getName());
switch (GV->getLinkage()) {
case GlobalValue::AppendingLinkage:
report_fatal_error("AppendingLinkage is not supported by this target!");
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::ExternalLinkage:
emitArrayBound(GVSym, GV);
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// TODO Use COMDAT groups for LinkOnceLinkage
if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
// FALL THROUGH
case GlobalValue::InternalLinkage:
case GlobalValue::PrivateLinkage:
break;
case GlobalValue::DLLImportLinkage:
llvm_unreachable("DLLImport linkage is not supported by this target!");
case GlobalValue::DLLExportLinkage:
llvm_unreachable("DLLExport linkage is not supported by this target!");
default:
llvm_unreachable("Unknown linkage type!");
}
EmitAlignment(Align > 2 ? Align : 2, GV);
unsigned Size = TD->getTypeAllocSize(C->getType());
if (GV->isThreadLocal()) {
Size *= MaxThreads;
}
if (MAI->hasDotTypeDotSizeDirective()) {
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
Twine(Size));
}
OutStreamer.EmitLabel(GVSym);
EmitGlobalConstant(C);
if (GV->isThreadLocal()) {
for (unsigned i = 1; i < MaxThreads; ++i)
EmitGlobalConstant(C);
}
// The ABI requires that unsigned scalar types smaller than 32 bits
// are padded to 32 bits.
if (Size < 4)
OutStreamer.EmitZeros(4 - Size, 0);
// Mark the end of the global
OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
}
/// EmitFunctionBodyEnd - Targets can override this to emit stuff after
/// the last basic block in the function.
void XCoreAsmPrinter::EmitFunctionBodyEnd() {
// Emit function end directives
OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
".function");
}
void XCoreAsmPrinter::EmitFunctionEntryLabel() {
// Mark the start of the function
OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
".function," + CurrentFnSym->getName());
OutStreamer.EmitLabel(CurrentFnSym);
}
void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
printOperand(MI, opNum, O);
if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
return;
O << "+";
printOperand(MI, opNum+1, O);
}
void XCoreAsmPrinter::
printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
const std::string &directive) {
unsigned JTI = MI->getOperand(opNum).getIndex();
const MachineFunction *MF = MI->getParent()->getParent();
const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
O << "\t" << directive << " ";
for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
MachineBasicBlock *MBB = JTBBs[i];
if (i > 0)
O << ",";
O << *MBB->getSymbol();
}
}
void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(opNum);
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << getRegisterName(MO.getReg());
break;
case MachineOperand::MO_Immediate:
O << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
break;
case MachineOperand::MO_GlobalAddress:
O << *Mang->getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
case MachineOperand::MO_JumpTableIndex:
O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
case MachineOperand::MO_BlockAddress:
O << *GetBlockAddressSymbol(MO.getBlockAddress());
break;
default:
llvm_unreachable("not implemented");
}
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,const char *ExtraCode,
raw_ostream &O) {
printOperand(MI, OpNo, O);
return false;
}
void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream O(Str);
// Check for mov mnemonic
if (MI->getOpcode() == XCore::ADD_2rus && !MI->getOperand(2).getImm())
O << "\tmov " << getRegisterName(MI->getOperand(0).getReg()) << ", "
<< getRegisterName(MI->getOperand(1).getReg());
else
printInstruction(MI, O);
OutStreamer.EmitRawText(O.str());
}
// Force static initialization.
extern "C" void LLVMInitializeXCoreAsmPrinter() {
RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
}