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llvm-6502/lib/Target/XCore/XCoreAsmPrinter.cpp
Richard Osborne 597432fbe5 [XCore] Move lowering of thread local storage to a separate pass. 
Thread local storage is not supported by the XMOS linker so we handle
thread local variables by lowering the variable to an array of n elements
(where n is the number of hardware threads per core, currently 8
for all XMOS devices) indexed by the the current thread ID.

Previously this lowering was spread across the XCoreISelLowering and the
XCoreAsmPrinter classes. Moving this to a separate pass should be much
cleaner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181124 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-04 17:01:55 +00:00

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//===-- 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 "InstPrinter/XCoreInstPrinter.h"
#include "XCoreInstrInfo.h"
#include "XCoreMCInstLower.h"
#include "XCoreSubtarget.h"
#include "XCoreTargetMachine.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include <algorithm>
#include <cctype>
using namespace llvm;
namespace {
class XCoreAsmPrinter : public AsmPrinter {
const XCoreSubtarget &Subtarget;
XCoreMCInstLower MCInstLowering;
void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
public:
explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()),
MCInstLowering(*this) {}
virtual const char *getPassName() const {
return "XCore Assembly Printer";
}
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 EmitFunctionEntryLabel();
void EmitInstruction(const MachineInstr *MI);
void EmitFunctionBodyStart();
void EmitFunctionBodyEnd();
virtual MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
};
} // end of anonymous namespace
void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
assert(((GV->hasExternalLinkage() ||
GV->hasWeakLinkage()) ||
GV->hasLinkOnceLinkage()) && "Unexpected linkage");
if (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 DataLayout *TD = TM.getDataLayout();
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);
if (GV->isThreadLocal()) {
report_fatal_error("TLS is not supported by this target!");
}
unsigned Size = TD->getTypeAllocSize(C->getType());
if (MAI->hasDotTypeDotSizeDirective()) {
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
Twine(Size));
}
OutStreamer.EmitLabel(GVSym);
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);
// Mark the end of the global
OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
}
void XCoreAsmPrinter::EmitFunctionBodyStart() {
MCInstLowering.Initialize(Mang, &MF->getContext());
}
/// 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::
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 << XCoreInstPrinter::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) {
// 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:
// See if this is a generic print operand
return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
}
printOperand(MI, OpNo, O);
return false;
}
void XCoreAsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
raw_ostream &OS) {
unsigned NOps = MI->getNumOperands();
assert(NOps == 4);
OS << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
// cast away const; DIetc do not take const operands for some reason.
DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
OS << V.getName();
OS << " <- ";
// Frame address. Currently handles register +- offset only.
assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
OS << '['; printOperand(MI, 0, OS); OS << '+'; printOperand(MI, 1, OS);
OS << ']';
OS << "+";
printOperand(MI, NOps-2, OS);
}
MachineLocation XCoreAsmPrinter::
getDebugValueLocation(const MachineInstr *MI) const {
// Handles frame addresses emitted in XCoreInstrInfo::emitFrameIndexDebugValue.
assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm() &&
"Unexpected MachineOperand types");
return MachineLocation(MI->getOperand(0).getReg(),
MI->getOperand(1).getImm());
}
void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream O(Str);
switch (MI->getOpcode()) {
case XCore::DBG_VALUE: {
if (isVerbose() && OutStreamer.hasRawTextSupport()) {
SmallString<128> TmpStr;
raw_svector_ostream OS(TmpStr);
PrintDebugValueComment(MI, OS);
OutStreamer.EmitRawText(StringRef(OS.str()));
}
return;
}
case XCore::ADD_2rus:
if (MI->getOperand(2).getImm() == 0) {
O << "\tmov "
<< XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
OutStreamer.EmitRawText(O.str());
return;
}
break;
case XCore::BR_JT:
case XCore::BR_JT32:
O << "\tbru "
<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
if (MI->getOpcode() == XCore::BR_JT)
printInlineJT(MI, 0, O);
else
printInlineJT32(MI, 0, O);
O << '\n';
OutStreamer.EmitRawText(O.str());
return;
}
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
}
// Force static initialization.
extern "C" void LLVMInitializeXCoreAsmPrinter() {
RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
}
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