diff options
Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp b/contrib/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp new file mode 100644 index 0000000..6082587 --- /dev/null +++ b/contrib/llvm/lib/Target/PowerPC/PPCMCInstLower.cpp @@ -0,0 +1,172 @@ +//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains code to lower PPC MachineInstrs to their corresponding +// MCInst records. +// +//===----------------------------------------------------------------------===// + +#include "PPC.h" +#include "llvm/CodeGen/AsmPrinter.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineModuleInfoImpls.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCInst.h" +#include "llvm/Target/Mangler.h" +#include "llvm/ADT/SmallString.h" +using namespace llvm; + +static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) { + return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>(); +} + + +static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){ + MCContext &Ctx = AP.OutContext; + + SmallString<128> Name; + if (!MO.isGlobal()) { + assert(MO.isSymbol() && "Isn't a symbol reference"); + Name += AP.MAI->getGlobalPrefix(); + Name += MO.getSymbolName(); + } else { + const GlobalValue *GV = MO.getGlobal(); + bool isImplicitlyPrivate = false; + if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB || + (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)) + isImplicitlyPrivate = true; + + AP.Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate); + } + + // If the target flags on the operand changes the name of the symbol, do that + // before we return the symbol. + if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) { + Name += "$stub"; + MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); + MachineModuleInfoImpl::StubValueTy &StubSym = + getMachOMMI(AP).getFnStubEntry(Sym); + if (StubSym.getPointer()) + return Sym; + + if (MO.isGlobal()) { + StubSym = + MachineModuleInfoImpl:: + StubValueTy(AP.Mang->getSymbol(MO.getGlobal()), + !MO.getGlobal()->hasInternalLinkage()); + } else { + Name.erase(Name.end()-5, Name.end()); + StubSym = + MachineModuleInfoImpl:: + StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false); + } + return Sym; + } + + // If the symbol reference is actually to a non_lazy_ptr, not to the symbol, + // then add the suffix. + if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) { + Name += "$non_lazy_ptr"; + MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); + + MachineModuleInfoMachO &MachO = getMachOMMI(AP); + + MachineModuleInfoImpl::StubValueTy &StubSym = + (MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ? + MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym); + + if (StubSym.getPointer() == 0) { + assert(MO.isGlobal() && "Extern symbol not handled yet"); + StubSym = MachineModuleInfoImpl:: + StubValueTy(AP.Mang->getSymbol(MO.getGlobal()), + !MO.getGlobal()->hasInternalLinkage()); + } + return Sym; + } + + return Ctx.GetOrCreateSymbol(Name.str()); +} + +static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol, + AsmPrinter &Printer) { + MCContext &Ctx = Printer.OutContext; + MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None; + + if (MO.getTargetFlags() & PPCII::MO_LO16) + RefKind = MCSymbolRefExpr::VK_PPC_LO16; + else if (MO.getTargetFlags() & PPCII::MO_HA16) + RefKind = MCSymbolRefExpr::VK_PPC_HA16; + + // FIXME: This isn't right, but we don't have a good way to express this in + // the MC Level, see below. + if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) + RefKind = MCSymbolRefExpr::VK_None; + + const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx); + + if (!MO.isJTI() && MO.getOffset()) + Expr = MCBinaryExpr::CreateAdd(Expr, + MCConstantExpr::Create(MO.getOffset(), Ctx), + Ctx); + + // Subtract off the PIC base if required. + if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) { + const MachineFunction *MF = MO.getParent()->getParent()->getParent(); + + const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx); + Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx); + // FIXME: We have no way to make the result be VK_PPC_LO16/VK_PPC_HA16, + // since it is not a symbol! + } + + return MCOperand::CreateExpr(Expr); +} + +void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI, + AsmPrinter &AP) { + OutMI.setOpcode(MI->getOpcode()); + + for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { + const MachineOperand &MO = MI->getOperand(i); + + MCOperand MCOp; + switch (MO.getType()) { + default: + MI->dump(); + assert(0 && "unknown operand type"); + case MachineOperand::MO_Register: + assert(!MO.getSubReg() && "Subregs should be eliminated!"); + MCOp = MCOperand::CreateReg(MO.getReg()); + break; + case MachineOperand::MO_Immediate: + MCOp = MCOperand::CreateImm(MO.getImm()); + break; + case MachineOperand::MO_MachineBasicBlock: + MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create( + MO.getMBB()->getSymbol(), AP.OutContext)); + break; + case MachineOperand::MO_GlobalAddress: + case MachineOperand::MO_ExternalSymbol: + MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP); + break; + case MachineOperand::MO_JumpTableIndex: + MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP); + break; + case MachineOperand::MO_ConstantPoolIndex: + MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP); + break; + case MachineOperand::MO_BlockAddress: + MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP); + break; + } + + OutMI.addOperand(MCOp); + } +} |
