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//===-- PPCMCInstLower.cpp - Convert PPC MachineInstr to an MCInst --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower PPC MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/PPCMCAsmInfo.h"
#include "PPC.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCSubtarget.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
using namespace llvm;
static MCSymbol *GetSymbolFromOperand(const MachineOperand &MO,
AsmPrinter &AP) {
if (MO.isGlobal()) {
// Get the symbol from the global, accounting for XCOFF-specific
// intricacies (see TargetLoweringObjectFileXCOFF::getTargetSymbol).
const GlobalValue *GV = MO.getGlobal();
return AP.getSymbol(GV);
}
assert(MO.isSymbol() && "Isn't a symbol reference");
SmallString<128> Name;
const DataLayout &DL = AP.getDataLayout();
Mangler::getNameWithPrefix(Name, MO.getSymbolName(), DL);
MCContext &Ctx = AP.OutContext;
MCSymbol *Sym = Ctx.getOrCreateSymbol(Name);
return Sym;
}
static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
AsmPrinter &Printer) {
MCContext &Ctx = Printer.OutContext;
PPCMCExpr::Specifier RefKind = PPC::S_None;
unsigned access = MO.getTargetFlags();
switch (access) {
case PPCII::MO_TPREL_LO:
RefKind = PPC::S_TPREL_LO;
break;
case PPCII::MO_TPREL_HA:
RefKind = PPC::S_TPREL_HA;
break;
case PPCII::MO_DTPREL_LO:
RefKind = PPC::S_DTPREL_LO;
break;
case PPCII::MO_TLSLD_LO:
RefKind = PPC::S_GOT_TLSLD_LO;
break;
case PPCII::MO_TOC_LO:
RefKind = PPC::S_TOC_LO;
break;
case PPCII::MO_TLS:
RefKind = PPC::S_TLS;
break;
case PPCII::MO_TLS_PCREL_FLAG:
RefKind = PPC::S_TLS_PCREL;
break;
}
const TargetMachine &TM = Printer.TM;
const MachineInstr *MI = MO.getParent();
const MachineFunction *MF = MI->getMF();
if (MO.getTargetFlags() == PPCII::MO_PLT)
RefKind = PPC::S_PLT;
else if (MO.getTargetFlags() == PPCII::MO_PCREL_FLAG)
RefKind = PPC::S_PCREL;
else if (MO.getTargetFlags() == PPCII::MO_GOT_PCREL_FLAG)
RefKind = PPC::S_GOT_PCREL;
else if (MO.getTargetFlags() == PPCII::MO_TPREL_PCREL_FLAG)
RefKind = PPC::S_TPREL;
else if (MO.getTargetFlags() == PPCII::MO_GOT_TLSGD_PCREL_FLAG)
RefKind = PPC::S_GOT_TLSGD_PCREL;
else if (MO.getTargetFlags() == PPCII::MO_GOT_TLSLD_PCREL_FLAG)
RefKind = PPC::S_GOT_TLSLD_PCREL;
else if (MO.getTargetFlags() == PPCII::MO_GOT_TPREL_PCREL_FLAG)
RefKind = PPC::S_GOT_TPREL_PCREL;
else if (MO.getTargetFlags() == PPCII::MO_TPREL_FLAG ||
MO.getTargetFlags() == PPCII::MO_TLSLD_FLAG) {
assert(MO.isGlobal() && "Only expecting a global MachineOperand here!");
TLSModel::Model Model = TM.getTLSModel(MO.getGlobal());
const PPCFunctionInfo *FuncInfo = MF->getInfo<PPCFunctionInfo>();
// For the local-[exec|dynamic] TLS model, we may generate the offset from
// the TLS base as an immediate operand (instead of using a TOC entry). Set
// the relocation type in case the result is used for purposes other than a
// TOC reference. In TOC reference cases, this result is discarded.
if (Model == TLSModel::LocalExec)
RefKind = PPC::S_AIX_TLSLE;
else if (Model == TLSModel::LocalDynamic &&
FuncInfo->isAIXFuncUseTLSIEForLD())
// On AIX, TLS model opt may have turned local-dynamic accesses into
// initial-exec accesses.
RefKind = PPC::S_AIX_TLSIE;
else if (Model == TLSModel::LocalDynamic)
RefKind = PPC::S_AIX_TLSLD;
}
const Module *M = MF->getFunction().getParent();
const PPCSubtarget *Subtarget = &(MF->getSubtarget<PPCSubtarget>());
unsigned MIOpcode = MI->getOpcode();
assert((Subtarget->isUsingPCRelativeCalls() || MIOpcode != PPC::BL8_NOTOC) &&
"BL8_NOTOC is only valid when using PC Relative Calls.");
if (Subtarget->isUsingPCRelativeCalls()) {
if (MIOpcode == PPC::TAILB || MIOpcode == PPC::TAILB8 ||
MIOpcode == PPC::TCRETURNdi || MIOpcode == PPC::TCRETURNdi8 ||
MIOpcode == PPC::BL8_NOTOC || MIOpcode == PPC::BL8_NOTOC_RM) {
RefKind = PPC::S_NOTOC;
}
if (MO.getTargetFlags() == PPCII::MO_PCREL_OPT_FLAG)
RefKind = PPC::S_PCREL_OPT;
}
const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, RefKind, Ctx);
// If -msecure-plt -fPIC, add 32768 to symbol.
if (Subtarget->isSecurePlt() && TM.isPositionIndependent() &&
M->getPICLevel() == PICLevel::BigPIC &&
MO.getTargetFlags() == PPCII::MO_PLT)
Expr =
MCBinaryExpr::createAdd(Expr, MCConstantExpr::create(32768, Ctx), 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 ||
MO.getTargetFlags() == PPCII::MO_PIC_HA_FLAG ||
MO.getTargetFlags() == PPCII::MO_PIC_LO_FLAG) {
const MachineFunction *MF = MO.getParent()->getParent()->getParent();
const MCExpr *PB = MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
Expr = MCBinaryExpr::createSub(Expr, PB, Ctx);
}
// Add ha16() / lo16() markers if required.
switch (access) {
case PPCII::MO_LO:
case PPCII::MO_PIC_LO_FLAG:
Expr = MCSpecifierExpr::create(Expr, PPC::S_LO, Ctx);
break;
case PPCII::MO_HA:
case PPCII::MO_PIC_HA_FLAG:
Expr = MCSpecifierExpr::create(Expr, PPC::S_HA, Ctx);
break;
}
return MCOperand::createExpr(Expr);
}
void llvm::LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
AsmPrinter &AP) {
OutMI.setOpcode(MI->getOpcode());
for (const MachineOperand &MO : MI->operands()) {
MCOperand MCOp;
if (LowerPPCMachineOperandToMCOperand(MO, MCOp, AP))
OutMI.addOperand(MCOp);
}
}
bool llvm::LowerPPCMachineOperandToMCOperand(const MachineOperand &MO,
MCOperand &OutMO, AsmPrinter &AP) {
switch (MO.getType()) {
default:
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
assert(!MO.getSubReg() && "Subregs should be eliminated!");
assert(MO.getReg() > PPC::NoRegister &&
MO.getReg() < PPC::NUM_TARGET_REGS &&
"Invalid register for this target!");
// ISA instructions refer to the containing dmr reg.
if (PPC::isDMRROWpRegister(MO.getReg())) {
OutMO =
MCOperand::createReg(PPC::DMR0 + (MO.getReg() - PPC::DMRROWp0) / 4);
return true;
}
// Ignore all implicit register operands.
if (MO.isImplicit())
return false;
OutMO = MCOperand::createReg(MO.getReg());
return true;
case MachineOperand::MO_Immediate:
OutMO = MCOperand::createImm(MO.getImm());
return true;
case MachineOperand::MO_MachineBasicBlock:
OutMO = MCOperand::createExpr(
MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), AP.OutContext));
return true;
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
OutMO = GetSymbolRef(MO, GetSymbolFromOperand(MO, AP), AP);
return true;
case MachineOperand::MO_JumpTableIndex:
OutMO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
return true;
case MachineOperand::MO_ConstantPoolIndex:
OutMO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
return true;
case MachineOperand::MO_BlockAddress:
OutMO =
GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP);
return true;
case MachineOperand::MO_MCSymbol:
OutMO = GetSymbolRef(MO, MO.getMCSymbol(), AP);
return true;
case MachineOperand::MO_RegisterMask:
return false;
}
}
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