mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157935 91177308-0d34-0410-b5e6-96231b3b80d8
188 lines
6.6 KiB
C++
188 lines
6.6 KiB
C++
//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code to lower PPC MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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static MachineModuleInfoMachO &getMachOMMI(AsmPrinter &AP) {
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return AP.MMI->getObjFileInfo<MachineModuleInfoMachO>();
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}
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static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO, AsmPrinter &AP){
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MCContext &Ctx = AP.OutContext;
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SmallString<128> Name;
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if (!MO.isGlobal()) {
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assert(MO.isSymbol() && "Isn't a symbol reference");
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Name += AP.MAI->getGlobalPrefix();
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Name += MO.getSymbolName();
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} else {
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const GlobalValue *GV = MO.getGlobal();
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bool isImplicitlyPrivate = false;
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if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB ||
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(MO.getTargetFlags() & PPCII::MO_NLP_FLAG))
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isImplicitlyPrivate = true;
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AP.Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
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}
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// If the target flags on the operand changes the name of the symbol, do that
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// before we return the symbol.
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if (MO.getTargetFlags() == PPCII::MO_DARWIN_STUB) {
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Name += "$stub";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MachineModuleInfoImpl::StubValueTy &StubSym =
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getMachOMMI(AP).getFnStubEntry(Sym);
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if (StubSym.getPointer())
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return Sym;
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if (MO.isGlobal()) {
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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} else {
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Name.erase(Name.end()-5, Name.end());
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false);
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}
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return Sym;
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}
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// If the symbol reference is actually to a non_lazy_ptr, not to the symbol,
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// then add the suffix.
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if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG) {
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Name += "$non_lazy_ptr";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MachineModuleInfoMachO &MachO = getMachOMMI(AP);
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MachineModuleInfoImpl::StubValueTy &StubSym =
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(MO.getTargetFlags() & PPCII::MO_NLP_HIDDEN_FLAG) ?
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MachO.getHiddenGVStubEntry(Sym) : MachO.getGVStubEntry(Sym);
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if (StubSym.getPointer() == 0) {
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assert(MO.isGlobal() && "Extern symbol not handled yet");
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StubSym = MachineModuleInfoImpl::
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StubValueTy(AP.Mang->getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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}
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return Sym;
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}
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return Ctx.GetOrCreateSymbol(Name.str());
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}
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static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
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AsmPrinter &Printer, bool isDarwin) {
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MCContext &Ctx = Printer.OutContext;
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MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
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unsigned access = MO.getTargetFlags() & PPCII::MO_ACCESS_MASK;
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switch (access) {
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case PPCII::MO_HA16: RefKind = isDarwin ?
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MCSymbolRefExpr::VK_PPC_DARWIN_HA16 :
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MCSymbolRefExpr::VK_PPC_GAS_HA16;
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break;
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case PPCII::MO_LO16: RefKind = isDarwin ?
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MCSymbolRefExpr::VK_PPC_DARWIN_LO16 :
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MCSymbolRefExpr::VK_PPC_GAS_LO16;
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break;
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case PPCII::MO_TPREL16_HA: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_HA;
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break;
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case PPCII::MO_TPREL16_LO: RefKind = MCSymbolRefExpr::VK_PPC_TPREL16_LO;
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break;
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}
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// FIXME: This isn't right, but we don't have a good way to express this in
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// the MC Level, see below.
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if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG)
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RefKind = MCSymbolRefExpr::VK_None;
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const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, RefKind, Ctx);
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if (!MO.isJTI() && MO.getOffset())
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Expr = MCBinaryExpr::CreateAdd(Expr,
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MCConstantExpr::Create(MO.getOffset(), Ctx),
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Ctx);
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// Subtract off the PIC base if required.
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if (MO.getTargetFlags() & PPCII::MO_PIC_FLAG) {
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const MachineFunction *MF = MO.getParent()->getParent()->getParent();
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const MCExpr *PB = MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), Ctx);
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Expr = MCBinaryExpr::CreateSub(Expr, PB, Ctx);
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// FIXME: We have no way to make the result be VK_PPC_LO16/VK_PPC_HA16,
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// since it is not a symbol!
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}
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return MCOperand::CreateExpr(Expr);
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}
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void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
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AsmPrinter &AP, bool isDarwin) {
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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MCOperand MCOp;
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switch (MO.getType()) {
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default:
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MI->dump();
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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assert(!MO.getSubReg() && "Subregs should be eliminated!");
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MCOp = MCOperand::CreateReg(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::CreateImm(MO.getImm());
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
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MO.getMBB()->getSymbol(), AP.OutContext));
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break;
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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MCOp = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP, isDarwin);
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break;
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case MachineOperand::MO_JumpTableIndex:
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MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, isDarwin);
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, isDarwin);
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break;
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case MachineOperand::MO_BlockAddress:
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MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP,
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isDarwin);
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break;
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case MachineOperand::MO_RegisterMask:
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continue;
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}
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OutMI.addOperand(MCOp);
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}
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}
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