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derived classes. Since global data alignment, layout, and mangling is often based on the DataLayout, move it to the TargetMachine. This ensures that global data is going to be layed out and mangled consistently if the subtarget changes on a per function basis. Prior to this all targets(*) have had subtarget dependent code moved out and onto the TargetMachine. *One target hasn't been migrated as part of this change: R600. The R600 port has, as a subtarget feature, the size of pointers and this affects global data layout. I've currently hacked in a FIXME to enable progress, but the port needs to be updated to either pass the 64-bitness to the TargetMachine, or fix the DataLayout to avoid subtarget dependent features. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227113 91177308-0d34-0410-b5e6-96231b3b80d8
223 lines
7.1 KiB
C++
223 lines
7.1 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 "MCTargetDesc/PPCMCExpr.h"
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#include "PPCSubtarget.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.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/IR/DataLayout.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Mangler.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/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.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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const TargetMachine &TM = AP.TM;
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Mangler *Mang = AP.Mang;
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const DataLayout *DL = TM.getDataLayout();
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MCContext &Ctx = AP.OutContext;
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bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
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SmallString<128> Name;
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StringRef Suffix;
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if (MO.getTargetFlags() == PPCII::MO_PLT_OR_STUB) {
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if (isDarwin)
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Suffix = "$stub";
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} else if (MO.getTargetFlags() & PPCII::MO_NLP_FLAG)
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Suffix = "$non_lazy_ptr";
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if (!Suffix.empty())
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Name += DL->getPrivateGlobalPrefix();
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unsigned PrefixLen = Name.size();
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if (!MO.isGlobal()) {
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assert(MO.isSymbol() && "Isn't a symbol reference");
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Mang->getNameWithPrefix(Name, MO.getSymbolName());
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} else {
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const GlobalValue *GV = MO.getGlobal();
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TM.getNameWithPrefix(Name, GV, *Mang);
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}
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unsigned OrigLen = Name.size() - PrefixLen;
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Name += Suffix;
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
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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_PLT_OR_STUB && isDarwin) {
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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.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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} else {
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(Ctx.GetOrCreateSymbol(OrigName), 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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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()) {
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assert(MO.isGlobal() && "Extern symbol not handled yet");
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StubSym = MachineModuleInfoImpl::
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StubValueTy(AP.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 Sym;
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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_TPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_LO;
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break;
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case PPCII::MO_TPREL_HA:
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RefKind = MCSymbolRefExpr::VK_PPC_TPREL_HA;
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break;
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case PPCII::MO_DTPREL_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_DTPREL_LO;
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break;
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case PPCII::MO_TLSLD_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO;
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break;
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case PPCII::MO_TOC_LO:
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RefKind = MCSymbolRefExpr::VK_PPC_TOC_LO;
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break;
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case PPCII::MO_TLS:
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RefKind = MCSymbolRefExpr::VK_PPC_TLS;
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break;
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case PPCII::MO_TLSGD:
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RefKind = MCSymbolRefExpr::VK_PPC_TLSGD;
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break;
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case PPCII::MO_TLSLD:
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RefKind = MCSymbolRefExpr::VK_PPC_TLSLD;
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break;
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}
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if (MO.getTargetFlags() == PPCII::MO_PLT_OR_STUB && !isDarwin)
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RefKind = MCSymbolRefExpr::VK_PLT;
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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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}
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// Add ha16() / lo16() markers if required.
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switch (access) {
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case PPCII::MO_LO:
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Expr = PPCMCExpr::CreateLo(Expr, isDarwin, Ctx);
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break;
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case PPCII::MO_HA:
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Expr = PPCMCExpr::CreateHa(Expr, isDarwin, Ctx);
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break;
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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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