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llvm-project/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

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//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
//
// 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 a printer that converts from our internal representation
// of machine-dependent LLVM code to PowerPC assembly language. This printer is
// the output mechanism used by `llc'.
//
// Documentation at http://developer.apple.com/documentation/DeveloperTools/
// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/PPCInstPrinter.h"
#include "MCTargetDesc/PPCMCExpr.h"
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPC.h"
#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCSubtarget.h"
#include "PPCTargetMachine.h"
#include "PPCTargetStreamer.h"
#include "TargetInfo/PowerPCTargetInfo.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/StackMaps.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCSymbolXCOFF.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <memory>
#include <new>
using namespace llvm;
#define DEBUG_TYPE "asmprinter"
namespace {
class PPCAsmPrinter : public AsmPrinter {
protected:
MapVector<const MCSymbol *, MCSymbol *> TOC;
const PPCSubtarget *Subtarget = nullptr;
StackMaps SM;
virtual MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO);
public:
explicit PPCAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)), SM(*this) {}
StringRef getPassName() const override { return "PowerPC Assembly Printer"; }
MCSymbol *lookUpOrCreateTOCEntry(const MCSymbol *Sym);
bool doInitialization(Module &M) override {
if (!TOC.empty())
TOC.clear();
return AsmPrinter::doInitialization(M);
}
void emitInstruction(const MachineInstr *MI) override;
/// This function is for PrintAsmOperand and PrintAsmMemoryOperand,
/// invoked by EmitMSInlineAsmStr and EmitGCCInlineAsmStr only.
/// The \p MI would be INLINEASM ONLY.
void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override;
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) override;
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) override;
void emitEndOfAsmFile(Module &M) override;
void LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI);
void LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI);
void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
bool runOnMachineFunction(MachineFunction &MF) override {
Subtarget = &MF.getSubtarget<PPCSubtarget>();
bool Changed = AsmPrinter::runOnMachineFunction(MF);
emitXRayTable();
return Changed;
}
};
/// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
class PPCLinuxAsmPrinter : public PPCAsmPrinter {
public:
explicit PPCLinuxAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: PPCAsmPrinter(TM, std::move(Streamer)) {}
StringRef getPassName() const override {
return "Linux PPC Assembly Printer";
}
void emitStartOfAsmFile(Module &M) override;
void emitEndOfAsmFile(Module &) override;
void emitFunctionEntryLabel() override;
void emitFunctionBodyStart() override;
void emitFunctionBodyEnd() override;
void emitInstruction(const MachineInstr *MI) override;
};
class PPCAIXAsmPrinter : public PPCAsmPrinter {
private:
static void ValidateGV(const GlobalVariable *GV);
protected:
MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO) override;
public:
PPCAIXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
: PPCAsmPrinter(TM, std::move(Streamer)) {}
StringRef getPassName() const override { return "AIX PPC Assembly Printer"; }
void SetupMachineFunction(MachineFunction &MF) override;
const MCExpr *lowerConstant(const Constant *CV) override;
void emitGlobalVariable(const GlobalVariable *GV) override;
void emitFunctionDescriptor() override;
void emitEndOfAsmFile(Module &) override;
};
} // end anonymous namespace
void PPCAsmPrinter::PrintSymbolOperand(const MachineOperand &MO,
raw_ostream &O) {
// Computing the address of a global symbol, not calling it.
const GlobalValue *GV = MO.getGlobal();
getSymbol(GV)->print(O, MAI);
printOffset(MO.getOffset(), O);
}
void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
const DataLayout &DL = getDataLayout();
const MachineOperand &MO = MI->getOperand(OpNo);
switch (MO.getType()) {
case MachineOperand::MO_Register: {
// The MI is INLINEASM ONLY and UseVSXReg is always false.
const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
// Linux assembler (Others?) does not take register mnemonics.
// FIXME - What about special registers used in mfspr/mtspr?
O << PPCRegisterInfo::stripRegisterPrefix(RegName);
return;
}
case MachineOperand::MO_Immediate:
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
MO.getMBB()->getSymbol()->print(O, MAI);
return;
case MachineOperand::MO_ConstantPoolIndex:
O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
<< MO.getIndex();
return;
case MachineOperand::MO_BlockAddress:
GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
return;
case MachineOperand::MO_GlobalAddress: {
PrintSymbolOperand(MO, O);
return;
}
default:
O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
return;
}
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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, ExtraCode, O);
case 'L': // Write second word of DImode reference.
// Verify that this operand has two consecutive registers.
if (!MI->getOperand(OpNo).isReg() ||
OpNo+1 == MI->getNumOperands() ||
!MI->getOperand(OpNo+1).isReg())
return true;
++OpNo; // Return the high-part.
break;
case 'I':
// Write 'i' if an integer constant, otherwise nothing. Used to print
// addi vs add, etc.
if (MI->getOperand(OpNo).isImm())
O << "i";
return false;
case 'x':
if(!MI->getOperand(OpNo).isReg())
return true;
// This operand uses VSX numbering.
// If the operand is a VMX register, convert it to a VSX register.
Register Reg = MI->getOperand(OpNo).getReg();
if (PPCInstrInfo::isVRRegister(Reg))
Reg = PPC::VSX32 + (Reg - PPC::V0);
else if (PPCInstrInfo::isVFRegister(Reg))
Reg = PPC::VSX32 + (Reg - PPC::VF0);
const char *RegName;
RegName = PPCInstPrinter::getRegisterName(Reg);
RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
O << RegName;
return false;
}
}
printOperand(MI, OpNo, O);
return false;
}
// At the moment, all inline asm memory operands are a single register.
// In any case, the output of this routine should always be just one
// assembler operand.
bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'y': { // A memory reference for an X-form instruction
O << "0, ";
printOperand(MI, OpNo, O);
return false;
}
case 'U': // Print 'u' for update form.
case 'X': // Print 'x' for indexed form.
{
// FIXME: Currently for PowerPC memory operands are always loaded
// into a register, so we never get an update or indexed form.
// This is bad even for offset forms, since even if we know we
// have a value in -16(r1), we will generate a load into r<n>
// and then load from 0(r<n>). Until that issue is fixed,
// tolerate 'U' and 'X' but don't output anything.
assert(MI->getOperand(OpNo).isReg());
return false;
}
}
}
assert(MI->getOperand(OpNo).isReg());
O << "0(";
printOperand(MI, OpNo, O);
O << ")";
return false;
}
/// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
/// exists for it. If not, create one. Then return a symbol that references
/// the TOC entry.
MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(const MCSymbol *Sym) {
MCSymbol *&TOCEntry = TOC[Sym];
if (!TOCEntry)
TOCEntry = createTempSymbol("C");
return TOCEntry;
}
void PPCAsmPrinter::emitEndOfAsmFile(Module &M) {
emitStackMaps(SM);
}
void PPCAsmPrinter::LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI) {
unsigned NumNOPBytes = MI.getOperand(1).getImm();
auto &Ctx = OutStreamer->getContext();
MCSymbol *MILabel = Ctx.createTempSymbol();
OutStreamer->emitLabel(MILabel);
SM.recordStackMap(*MILabel, MI);
assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
// Scan ahead to trim the shadow.
const MachineBasicBlock &MBB = *MI.getParent();
MachineBasicBlock::const_iterator MII(MI);
++MII;
while (NumNOPBytes > 0) {
if (MII == MBB.end() || MII->isCall() ||
MII->getOpcode() == PPC::DBG_VALUE ||
MII->getOpcode() == TargetOpcode::PATCHPOINT ||
MII->getOpcode() == TargetOpcode::STACKMAP)
break;
++MII;
NumNOPBytes -= 4;
}
// Emit nops.
for (unsigned i = 0; i < NumNOPBytes; i += 4)
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
}
// Lower a patchpoint of the form:
// [<def>], <id>, <numBytes>, <target>, <numArgs>
void PPCAsmPrinter::LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI) {
auto &Ctx = OutStreamer->getContext();
MCSymbol *MILabel = Ctx.createTempSymbol();
OutStreamer->emitLabel(MILabel);
SM.recordPatchPoint(*MILabel, MI);
PatchPointOpers Opers(&MI);
unsigned EncodedBytes = 0;
const MachineOperand &CalleeMO = Opers.getCallTarget();
if (CalleeMO.isImm()) {
int64_t CallTarget = CalleeMO.getImm();
if (CallTarget) {
assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
"High 16 bits of call target should be zero.");
Register ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
EncodedBytes = 0;
// Materialize the jump address:
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI8)
.addReg(ScratchReg)
.addImm((CallTarget >> 32) & 0xFFFF));
++EncodedBytes;
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::RLDIC)
.addReg(ScratchReg)
.addReg(ScratchReg)
.addImm(32).addImm(16));
++EncodedBytes;
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORIS8)
.addReg(ScratchReg)
.addReg(ScratchReg)
.addImm((CallTarget >> 16) & 0xFFFF));
++EncodedBytes;
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORI8)
.addReg(ScratchReg)
.addReg(ScratchReg)
.addImm(CallTarget & 0xFFFF));
// Save the current TOC pointer before the remote call.
int TOCSaveOffset = Subtarget->getFrameLowering()->getTOCSaveOffset();
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::STD)
.addReg(PPC::X2)
.addImm(TOCSaveOffset)
.addReg(PPC::X1));
++EncodedBytes;
// If we're on ELFv1, then we need to load the actual function pointer
// from the function descriptor.
if (!Subtarget->isELFv2ABI()) {
// Load the new TOC pointer and the function address, but not r11
// (needing this is rare, and loading it here would prevent passing it
// via a 'nest' parameter.
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
.addReg(PPC::X2)
.addImm(8)
.addReg(ScratchReg));
++EncodedBytes;
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
.addReg(ScratchReg)
.addImm(0)
.addReg(ScratchReg));
++EncodedBytes;
}
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR8)
.addReg(ScratchReg));
++EncodedBytes;
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTRL8));
++EncodedBytes;
// Restore the TOC pointer after the call.
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
.addReg(PPC::X2)
.addImm(TOCSaveOffset)
.addReg(PPC::X1));
++EncodedBytes;
}
} else if (CalleeMO.isGlobal()) {
const GlobalValue *GValue = CalleeMO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL8_NOP)
.addExpr(SymVar));
EncodedBytes += 2;
}
// Each instruction is 4 bytes.
EncodedBytes *= 4;
// Emit padding.
unsigned NumBytes = Opers.getNumPatchBytes();
assert(NumBytes >= EncodedBytes &&
"Patchpoint can't request size less than the length of a call.");
assert((NumBytes - EncodedBytes) % 4 == 0 &&
"Invalid number of NOP bytes requested!");
for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
}
/// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
/// call to __tls_get_addr to the current output stream.
void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
MCSymbolRefExpr::VariantKind VK) {
StringRef Name = "__tls_get_addr";
MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name);
MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
const Module *M = MF->getFunction().getParent();
assert(MI->getOperand(0).isReg() &&
((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
(!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
"GETtls[ld]ADDR[32] must define GPR3");
assert(MI->getOperand(1).isReg() &&
((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
(!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
"GETtls[ld]ADDR[32] must read GPR3");
if (Subtarget->is32BitELFABI() && isPositionIndependent())
Kind = MCSymbolRefExpr::VK_PLT;
const MCExpr *TlsRef =
MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
// Add 32768 offset to the symbol so we follow up the latest GOT/PLT ABI.
if (Kind == MCSymbolRefExpr::VK_PLT && Subtarget->isSecurePlt() &&
M->getPICLevel() == PICLevel::BigPIC)
TlsRef = MCBinaryExpr::createAdd(
TlsRef, MCConstantExpr::create(32768, OutContext), OutContext);
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
EmitToStreamer(*OutStreamer,
MCInstBuilder(Subtarget->isPPC64() ?
PPC::BL8_NOP_TLS : PPC::BL_TLS)
.addExpr(TlsRef)
.addExpr(SymVar));
}
/// Map a machine operand for a TOC pseudo-machine instruction to its
/// corresponding MCSymbol.
MCSymbol *PPCAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) {
switch (MO.getType()) {
case MachineOperand::MO_GlobalAddress:
return getSymbol(MO.getGlobal());
case MachineOperand::MO_ConstantPoolIndex:
return GetCPISymbol(MO.getIndex());
case MachineOperand::MO_JumpTableIndex:
return GetJTISymbol(MO.getIndex());
case MachineOperand::MO_BlockAddress:
return GetBlockAddressSymbol(MO.getBlockAddress());
default:
llvm_unreachable("Unexpected operand type to get symbol.");
}
}
/// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
/// the current output stream.
///
void PPCAsmPrinter::emitInstruction(const MachineInstr *MI) {
MCInst TmpInst;
const bool IsPPC64 = Subtarget->isPPC64();
const bool IsAIX = Subtarget->isAIXABI();
const Module *M = MF->getFunction().getParent();
PICLevel::Level PL = M->getPICLevel();
#ifndef NDEBUG
// Validate that SPE and FPU are mutually exclusive in codegen
if (!MI->isInlineAsm()) {
for (const MachineOperand &MO: MI->operands()) {
if (MO.isReg()) {
Register Reg = MO.getReg();
if (Subtarget->hasSPE()) {
if (PPC::F4RCRegClass.contains(Reg) ||
PPC::F8RCRegClass.contains(Reg) ||
PPC::QBRCRegClass.contains(Reg) ||
PPC::QFRCRegClass.contains(Reg) ||
PPC::QSRCRegClass.contains(Reg) ||
PPC::VFRCRegClass.contains(Reg) ||
PPC::VRRCRegClass.contains(Reg) ||
PPC::VSFRCRegClass.contains(Reg) ||
PPC::VSSRCRegClass.contains(Reg)
)
llvm_unreachable("SPE targets cannot have FPRegs!");
} else {
if (PPC::SPERCRegClass.contains(Reg))
llvm_unreachable("SPE register found in FPU-targeted code!");
}
}
}
}
#endif
// Lower multi-instruction pseudo operations.
switch (MI->getOpcode()) {
default: break;
case TargetOpcode::DBG_VALUE:
llvm_unreachable("Should be handled target independently");
case TargetOpcode::STACKMAP:
return LowerSTACKMAP(SM, *MI);
case TargetOpcode::PATCHPOINT:
return LowerPATCHPOINT(SM, *MI);
case PPC::MoveGOTtoLR: {
// Transform %lr = MoveGOTtoLR
// Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
// _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
// _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
// blrl
// This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
MCSymbol *GOTSymbol =
OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
const MCExpr *OffsExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol,
MCSymbolRefExpr::VK_PPC_LOCAL,
OutContext),
MCConstantExpr::create(4, OutContext),
OutContext);
// Emit the 'bl'.
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
return;
}
case PPC::MovePCtoLR:
case PPC::MovePCtoLR8: {
// Transform %lr = MovePCtoLR
// Into this, where the label is the PIC base:
// bl L1$pb
// L1$pb:
MCSymbol *PICBase = MF->getPICBaseSymbol();
// Emit the 'bl'.
EmitToStreamer(*OutStreamer,
MCInstBuilder(PPC::BL)
// FIXME: We would like an efficient form for this, so we
// don't have to do a lot of extra uniquing.
.addExpr(MCSymbolRefExpr::create(PICBase, OutContext)));
// Emit the label.
OutStreamer->emitLabel(PICBase);
return;
}
case PPC::UpdateGBR: {
// Transform %rd = UpdateGBR(%rt, %ri)
// Into: lwz %rt, .L0$poff - .L0$pb(%ri)
// add %rd, %rt, %ri
// or into (if secure plt mode is on):
// addis r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@ha
// addi r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@l
// Get the offset from the GOT Base Register to the GOT
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
if (Subtarget->isSecurePlt() && isPositionIndependent() ) {
unsigned PICR = TmpInst.getOperand(0).getReg();
MCSymbol *BaseSymbol = OutContext.getOrCreateSymbol(
M->getPICLevel() == PICLevel::SmallPIC ? "_GLOBAL_OFFSET_TABLE_"
: ".LTOC");
const MCExpr *PB =
MCSymbolRefExpr::create(MF->getPICBaseSymbol(), OutContext);
const MCExpr *DeltaExpr = MCBinaryExpr::createSub(
MCSymbolRefExpr::create(BaseSymbol, OutContext), PB, OutContext);
const MCExpr *DeltaHi = PPCMCExpr::createHa(DeltaExpr, OutContext);
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ADDIS).addReg(PICR).addReg(PICR).addExpr(DeltaHi));
const MCExpr *DeltaLo = PPCMCExpr::createLo(DeltaExpr, OutContext);
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ADDI).addReg(PICR).addReg(PICR).addExpr(DeltaLo));
return;
} else {
MCSymbol *PICOffset =
MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
TmpInst.setOpcode(PPC::LWZ);
const MCExpr *Exp =
MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
const MCExpr *PB =
MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
MCSymbolRefExpr::VK_None,
OutContext);
const MCOperand TR = TmpInst.getOperand(1);
const MCOperand PICR = TmpInst.getOperand(0);
// Step 1: lwz %rt, .L$poff - .L$pb(%ri)
TmpInst.getOperand(1) =
MCOperand::createExpr(MCBinaryExpr::createSub(Exp, PB, OutContext));
TmpInst.getOperand(0) = TR;
TmpInst.getOperand(2) = PICR;
EmitToStreamer(*OutStreamer, TmpInst);
TmpInst.setOpcode(PPC::ADD4);
TmpInst.getOperand(0) = PICR;
TmpInst.getOperand(1) = TR;
TmpInst.getOperand(2) = PICR;
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
}
case PPC::LWZtoc: {
// Transform %rN = LWZtoc @op1, %r2
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to LWZ.
TmpInst.setOpcode(PPC::LWZ);
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for LWZtoc.");
// Map the operand to its corresponding MCSymbol.
const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO);
// Create a reference to the GOT entry for the symbol. The GOT entry will be
// synthesized later.
if (PL == PICLevel::SmallPIC && !IsAIX) {
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
// Otherwise, use the TOC. 'TOCEntry' is a label used to reference the
// storage allocated in the TOC which contains the address of
// 'MOSymbol'. Said TOC entry will be synthesized later.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
const MCExpr *Exp =
MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None, OutContext);
// AIX uses the label directly as the lwz displacement operand for
// references into the toc section. The displacement value will be generated
// relative to the toc-base.
if (IsAIX) {
assert(
TM.getCodeModel() == CodeModel::Small &&
"This pseudo should only be selected for 32-bit small code model.");
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
// Create an explicit subtract expression between the local symbol and
// '.LTOC' to manifest the toc-relative offset.
const MCExpr *PB = MCSymbolRefExpr::create(
OutContext.getOrCreateSymbol(Twine(".LTOC")), OutContext);
Exp = MCBinaryExpr::createSub(Exp, PB, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::LDtocJTI:
case PPC::LDtocCPT:
case PPC::LDtocBA:
case PPC::LDtoc: {
// Transform %x3 = LDtoc @min1, %x2
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to LD.
TmpInst.setOpcode(PPC::LD);
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand!");
// Map the machine operand to its corresponding MCSymbol, then map the
// global address operand to be a reference to the TOC entry we will
// synthesize later.
MCSymbol *TOCEntry =
lookUpOrCreateTOCEntry(getMCSymbolForTOCPseudoMO(MO));
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_None : MCSymbolRefExpr::VK_PPC_TOC;
const MCExpr *Exp =
MCSymbolRefExpr::create(TOCEntry, VK, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDIStocHA: {
assert((IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large) &&
"This pseudo should only be selected for 32-bit large code model on"
" AIX.");
// Transform %rd = ADDIStocHA %rA, @sym(%r2)
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to ADDIS.
TmpInst.setOpcode(PPC::ADDIS);
const MachineOperand &MO = MI->getOperand(2);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for ADDIStocHA.");
// Map the machine operand to its corresponding MCSymbol.
MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
// Always use TOC on AIX. Map the global address operand to be a reference
// to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
// reference the storage allocated in the TOC which contains the address of
// 'MOSymbol'.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
MCSymbolRefExpr::VK_PPC_U,
OutContext);
TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::LWZtocL: {
assert(IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large &&
"This pseudo should only be selected for 32-bit large code model on"
" AIX.");
// Transform %rd = LWZtocL @sym, %rs.
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to lwz.
TmpInst.setOpcode(PPC::LWZ);
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for LWZtocL.");
// Map the machine operand to its corresponding MCSymbol.
MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
// Always use TOC on AIX. Map the global address operand to be a reference
// to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
// reference the storage allocated in the TOC which contains the address of
// 'MOSymbol'.
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
MCSymbolRefExpr::VK_PPC_L,
OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDIStocHA8: {
// Transform %xd = ADDIStocHA8 %x2, @sym
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to ADDIS8. If the global address is the address of
// an external symbol, is a jump table address, is a block address, or is a
// constant pool index with large code model enabled, then generate a TOC
// entry and reference that. Otherwise, reference the symbol directly.
TmpInst.setOpcode(PPC::ADDIS8);
const MachineOperand &MO = MI->getOperand(2);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
"Invalid operand for ADDIStocHA8!");
const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
const bool GlobalToc =
MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal());
if (GlobalToc || MO.isJTI() || MO.isBlockAddress() ||
(MO.isCPI() && TM.getCodeModel() == CodeModel::Large))
MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_PPC_U : MCSymbolRefExpr::VK_PPC_TOC_HA;
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
if (!MO.isJTI() && MO.getOffset())
Exp = MCBinaryExpr::createAdd(Exp,
MCConstantExpr::create(MO.getOffset(),
OutContext),
OutContext);
TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::LDtocL: {
// Transform %xd = LDtocL @sym, %xs
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to LD. If the global address is the address of
// an external symbol, is a jump table address, is a block address, or is
// a constant pool index with large code model enabled, then generate a
// TOC entry and reference that. Otherwise, reference the symbol directly.
TmpInst.setOpcode(PPC::LD);
const MachineOperand &MO = MI->getOperand(1);
assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
MO.isBlockAddress()) &&
"Invalid operand for LDtocL!");
LLVM_DEBUG(assert(
(!MO.isGlobal() || Subtarget->isGVIndirectSymbol(MO.getGlobal())) &&
"LDtocL used on symbol that could be accessed directly is "
"invalid. Must match ADDIStocHA8."));
const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
if (!MO.isCPI() || TM.getCodeModel() == CodeModel::Large)
MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
const MCSymbolRefExpr::VariantKind VK =
IsAIX ? MCSymbolRefExpr::VK_PPC_L : MCSymbolRefExpr::VK_PPC_TOC_LO;
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDItocL: {
// Transform %xd = ADDItocL %xs, @sym
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to ADDI8. If the global address is external, then
// generate a TOC entry and reference that. Otherwise, reference the
// symbol directly.
TmpInst.setOpcode(PPC::ADDI8);
const MachineOperand &MO = MI->getOperand(2);
assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL.");
LLVM_DEBUG(assert(
!(MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal())) &&
"Interposable definitions must use indirect access."));
const MCExpr *Exp =
MCSymbolRefExpr::create(getMCSymbolForTOCPseudoMO(MO),
MCSymbolRefExpr::VK_PPC_TOC_LO, OutContext);
TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::ADDISgotTprelHA: {
// Transform: %xd = ADDISgotTprelHA %x2, @sym
// Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha
assert(IsPPC64 && "Not supported for 32-bit PowerPC");
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTprel =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymGotTprel));
return;
}
case PPC::LDgotTprelL:
case PPC::LDgotTprelL32: {
// Transform %xd = LDgotTprelL @sym, %xs
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to LD.
TmpInst.setOpcode(IsPPC64 ? PPC::LD : PPC::LWZ);
const MachineOperand &MO = MI->getOperand(1);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *Exp = MCSymbolRefExpr::create(
MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO
: MCSymbolRefExpr::VK_PPC_GOT_TPREL,
OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
EmitToStreamer(*OutStreamer, TmpInst);
return;
}
case PPC::PPC32PICGOT: {
MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
MCSymbol *GOTRef = OutContext.createTempSymbol();
MCSymbol *NextInstr = OutContext.createTempSymbol();
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
// FIXME: We would like an efficient form for this, so we don't have to do
// a lot of extra uniquing.
.addExpr(MCSymbolRefExpr::create(NextInstr, OutContext)));
const MCExpr *OffsExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol, OutContext),
MCSymbolRefExpr::create(GOTRef, OutContext),
OutContext);
OutStreamer->emitLabel(GOTRef);
OutStreamer->emitValue(OffsExpr, 4);
OutStreamer->emitLabel(NextInstr);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR)
.addReg(MI->getOperand(0).getReg()));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LWZ)
.addReg(MI->getOperand(1).getReg())
.addImm(0)
.addReg(MI->getOperand(0).getReg()));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD4)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addReg(MI->getOperand(0).getReg()));
return;
}
case PPC::PPC32GOT: {
MCSymbol *GOTSymbol =
OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
const MCExpr *SymGotTlsL = MCSymbolRefExpr::create(
GOTSymbol, MCSymbolRefExpr::VK_PPC_LO, OutContext);
const MCExpr *SymGotTlsHA = MCSymbolRefExpr::create(
GOTSymbol, MCSymbolRefExpr::VK_PPC_HA, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI)
.addReg(MI->getOperand(0).getReg())
.addExpr(SymGotTlsL));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(0).getReg())
.addExpr(SymGotTlsHA));
return;
}
case PPC::ADDIStlsgdHA: {
// Transform: %xd = ADDIStlsgdHA %x2, @sym
// Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha
assert(IsPPC64 && "Not supported for 32-bit PowerPC");
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTlsGD =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymGotTlsGD));
return;
}
case PPC::ADDItlsgdL:
// Transform: %xd = ADDItlsgdL %xs, @sym
// Into: %xd = ADDI8 %xs, sym@got@tlsgd@l
case PPC::ADDItlsgdL32: {
// Transform: %rd = ADDItlsgdL32 %rs, @sym
// Into: %rd = ADDI %rs, sym@got@tlsgd
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTlsGD = MCSymbolRefExpr::create(
MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
: MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
OutContext);
EmitToStreamer(*OutStreamer,
MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymGotTlsGD));
return;
}
case PPC::GETtlsADDR:
// Transform: %x3 = GETtlsADDR %x3, @sym
// Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
case PPC::GETtlsADDR32: {
// Transform: %r3 = GETtlsADDR32 %r3, @sym
// Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
return;
}
case PPC::ADDIStlsldHA: {
// Transform: %xd = ADDIStlsldHA %x2, @sym
// Into: %xd = ADDIS8 %x2, sym@got@tlsld@ha
assert(IsPPC64 && "Not supported for 32-bit PowerPC");
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTlsLD =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymGotTlsLD));
return;
}
case PPC::ADDItlsldL:
// Transform: %xd = ADDItlsldL %xs, @sym
// Into: %xd = ADDI8 %xs, sym@got@tlsld@l
case PPC::ADDItlsldL32: {
// Transform: %rd = ADDItlsldL32 %rs, @sym
// Into: %rd = ADDI %rs, sym@got@tlsld
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymGotTlsLD = MCSymbolRefExpr::create(
MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
: MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
OutContext);
EmitToStreamer(*OutStreamer,
MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymGotTlsLD));
return;
}
case PPC::GETtlsldADDR:
// Transform: %x3 = GETtlsldADDR %x3, @sym
// Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
case PPC::GETtlsldADDR32: {
// Transform: %r3 = GETtlsldADDR32 %r3, @sym
// Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
return;
}
case PPC::ADDISdtprelHA:
// Transform: %xd = ADDISdtprelHA %xs, @sym
// Into: %xd = ADDIS8 %xs, sym@dtprel@ha
case PPC::ADDISdtprelHA32: {
// Transform: %rd = ADDISdtprelHA32 %rs, @sym
// Into: %rd = ADDIS %rs, sym@dtprel@ha
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymDtprel =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
OutContext);
EmitToStreamer(
*OutStreamer,
MCInstBuilder(IsPPC64 ? PPC::ADDIS8 : PPC::ADDIS)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymDtprel));
return;
}
case PPC::ADDIdtprelL:
// Transform: %xd = ADDIdtprelL %xs, @sym
// Into: %xd = ADDI8 %xs, sym@dtprel@l
case PPC::ADDIdtprelL32: {
// Transform: %rd = ADDIdtprelL32 %rs, @sym
// Into: %rd = ADDI %rs, sym@dtprel@l
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymDtprel =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
OutContext);
EmitToStreamer(*OutStreamer,
MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
.addReg(MI->getOperand(0).getReg())
.addReg(MI->getOperand(1).getReg())
.addExpr(SymDtprel));
return;
}
case PPC::MFOCRF:
case PPC::MFOCRF8:
if (!Subtarget->hasMFOCRF()) {
// Transform: %r3 = MFOCRF %cr7
// Into: %r3 = MFCR ;; cr7
unsigned NewOpcode =
MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
OutStreamer->AddComment(PPCInstPrinter::
getRegisterName(MI->getOperand(1).getReg()));
EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
.addReg(MI->getOperand(0).getReg()));
return;
}
break;
case PPC::MTOCRF:
case PPC::MTOCRF8:
if (!Subtarget->hasMFOCRF()) {
// Transform: %cr7 = MTOCRF %r3
// Into: MTCRF mask, %r3 ;; cr7
unsigned NewOpcode =
MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
->getEncodingValue(MI->getOperand(0).getReg());
OutStreamer->AddComment(PPCInstPrinter::
getRegisterName(MI->getOperand(0).getReg()));
EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
.addImm(Mask)
.addReg(MI->getOperand(1).getReg()));
return;
}
break;
case PPC::LD:
case PPC::STD:
case PPC::LWA_32:
case PPC::LWA: {
// Verify alignment is legal, so we don't create relocations
// that can't be supported.
// FIXME: This test is currently disabled for Darwin. The test
// suite shows a handful of test cases that fail this check for
// Darwin. Those need to be investigated before this sanity test
// can be enabled for those subtargets.
unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
const MachineOperand &MO = MI->getOperand(OpNum);
if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
// Now process the instruction normally.
break;
}
}
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
EmitToStreamer(*OutStreamer, TmpInst);
}
void PPCLinuxAsmPrinter::emitInstruction(const MachineInstr *MI) {
if (!Subtarget->isPPC64())
return PPCAsmPrinter::emitInstruction(MI);
switch (MI->getOpcode()) {
default:
return PPCAsmPrinter::emitInstruction(MI);
case TargetOpcode::PATCHABLE_FUNCTION_ENTER: {
// .begin:
// b .end # lis 0, FuncId[16..32]
// nop # li 0, FuncId[0..15]
// std 0, -8(1)
// mflr 0
// bl __xray_FunctionEntry
// mtlr 0
// .end:
//
// Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
// of instructions change.
MCSymbol *BeginOfSled = OutContext.createTempSymbol();
MCSymbol *EndOfSled = OutContext.createTempSymbol();
OutStreamer->emitLabel(BeginOfSled);
EmitToStreamer(*OutStreamer,
MCInstBuilder(PPC::B).addExpr(
MCSymbolRefExpr::create(EndOfSled, OutContext)));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0));
EmitToStreamer(*OutStreamer,
MCInstBuilder(PPC::BL8_NOP)
.addExpr(MCSymbolRefExpr::create(
OutContext.getOrCreateSymbol("__xray_FunctionEntry"),
OutContext)));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0));
OutStreamer->emitLabel(EndOfSled);
recordSled(BeginOfSled, *MI, SledKind::FUNCTION_ENTER);
break;
}
case TargetOpcode::PATCHABLE_RET: {
unsigned RetOpcode = MI->getOperand(0).getImm();
MCInst RetInst;
RetInst.setOpcode(RetOpcode);
for (const auto &MO :
make_range(std::next(MI->operands_begin()), MI->operands_end())) {
MCOperand MCOp;
if (LowerPPCMachineOperandToMCOperand(MO, MCOp, *this))
RetInst.addOperand(MCOp);
}
bool IsConditional;
if (RetOpcode == PPC::BCCLR) {
IsConditional = true;
} else if (RetOpcode == PPC::TCRETURNdi8 || RetOpcode == PPC::TCRETURNri8 ||
RetOpcode == PPC::TCRETURNai8) {
break;
} else if (RetOpcode == PPC::BLR8 || RetOpcode == PPC::TAILB8) {
IsConditional = false;
} else {
EmitToStreamer(*OutStreamer, RetInst);
break;
}
MCSymbol *FallthroughLabel;
if (IsConditional) {
// Before:
// bgtlr cr0
//
// After:
// ble cr0, .end
// .p2align 3
// .begin:
// blr # lis 0, FuncId[16..32]
// nop # li 0, FuncId[0..15]
// std 0, -8(1)
// mflr 0
// bl __xray_FunctionExit
// mtlr 0
// blr
// .end:
//
// Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
// of instructions change.
FallthroughLabel = OutContext.createTempSymbol();
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::BCC)
.addImm(PPC::InvertPredicate(
static_cast<PPC::Predicate>(MI->getOperand(1).getImm())))
.addReg(MI->getOperand(2).getReg())
.addExpr(MCSymbolRefExpr::create(FallthroughLabel, OutContext)));
RetInst = MCInst();
RetInst.setOpcode(PPC::BLR8);
}
// .p2align 3
// .begin:
// b(lr)? # lis 0, FuncId[16..32]
// nop # li 0, FuncId[0..15]
// std 0, -8(1)
// mflr 0
// bl __xray_FunctionExit
// mtlr 0
// b(lr)?
//
// Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
// of instructions change.
OutStreamer->emitCodeAlignment(8);
MCSymbol *BeginOfSled = OutContext.createTempSymbol();
OutStreamer->emitLabel(BeginOfSled);
EmitToStreamer(*OutStreamer, RetInst);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0));
EmitToStreamer(*OutStreamer,
MCInstBuilder(PPC::BL8_NOP)
.addExpr(MCSymbolRefExpr::create(
OutContext.getOrCreateSymbol("__xray_FunctionExit"),
OutContext)));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0));
EmitToStreamer(*OutStreamer, RetInst);
if (IsConditional)
OutStreamer->emitLabel(FallthroughLabel);
recordSled(BeginOfSled, *MI, SledKind::FUNCTION_EXIT);
break;
}
case TargetOpcode::PATCHABLE_FUNCTION_EXIT:
llvm_unreachable("PATCHABLE_FUNCTION_EXIT should never be emitted");
case TargetOpcode::PATCHABLE_TAIL_CALL:
// TODO: Define a trampoline `__xray_FunctionTailExit` and differentiate a
// normal function exit from a tail exit.
llvm_unreachable("Tail call is handled in the normal case. See comments "
"around this assert.");
}
}
void PPCLinuxAsmPrinter::emitStartOfAsmFile(Module &M) {
if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
PPCTargetStreamer *TS =
static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
if (TS)
TS->emitAbiVersion(2);
}
if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
!isPositionIndependent())
return AsmPrinter::emitStartOfAsmFile(M);
if (M.getPICLevel() == PICLevel::SmallPIC)
return AsmPrinter::emitStartOfAsmFile(M);
OutStreamer->SwitchSection(OutContext.getELFSection(
".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
MCSymbol *TOCSym = OutContext.getOrCreateSymbol(Twine(".LTOC"));
MCSymbol *CurrentPos = OutContext.createTempSymbol();
OutStreamer->emitLabel(CurrentPos);
// The GOT pointer points to the middle of the GOT, in order to reference the
// entire 64kB range. 0x8000 is the midpoint.
const MCExpr *tocExpr =
MCBinaryExpr::createAdd(MCSymbolRefExpr::create(CurrentPos, OutContext),
MCConstantExpr::create(0x8000, OutContext),
OutContext);
OutStreamer->emitAssignment(TOCSym, tocExpr);
OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
}
void PPCLinuxAsmPrinter::emitFunctionEntryLabel() {
// linux/ppc32 - Normal entry label.
if (!Subtarget->isPPC64() &&
(!isPositionIndependent() ||
MF->getFunction().getParent()->getPICLevel() == PICLevel::SmallPIC))
return AsmPrinter::emitFunctionEntryLabel();
if (!Subtarget->isPPC64()) {
const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
if (PPCFI->usesPICBase() && !Subtarget->isSecurePlt()) {
MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
MCSymbol *PICBase = MF->getPICBaseSymbol();
OutStreamer->emitLabel(RelocSymbol);
const MCExpr *OffsExpr =
MCBinaryExpr::createSub(
MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
OutContext),
MCSymbolRefExpr::create(PICBase, OutContext),
OutContext);
OutStreamer->emitValue(OffsExpr, 4);
OutStreamer->emitLabel(CurrentFnSym);
return;
} else
return AsmPrinter::emitFunctionEntryLabel();
}
// ELFv2 ABI - Normal entry label.
if (Subtarget->isELFv2ABI()) {
// In the Large code model, we allow arbitrary displacements between
// the text section and its associated TOC section. We place the
// full 8-byte offset to the TOC in memory immediately preceding
// the function global entry point.
if (TM.getCodeModel() == CodeModel::Large
&& !MF->getRegInfo().use_empty(PPC::X2)) {
const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
MCSymbol *GlobalEPSymbol = PPCFI->getGlobalEPSymbol();
const MCExpr *TOCDeltaExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
MCSymbolRefExpr::create(GlobalEPSymbol,
OutContext),
OutContext);
OutStreamer->emitLabel(PPCFI->getTOCOffsetSymbol());
OutStreamer->emitValue(TOCDeltaExpr, 8);
}
return AsmPrinter::emitFunctionEntryLabel();
}
// Emit an official procedure descriptor.
MCSectionSubPair Current = OutStreamer->getCurrentSection();
MCSectionELF *Section = OutStreamer->getContext().getELFSection(
".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
OutStreamer->SwitchSection(Section);
OutStreamer->emitLabel(CurrentFnSym);
OutStreamer->emitValueToAlignment(8);
MCSymbol *Symbol1 = CurrentFnSymForSize;
// Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
// entry point.
OutStreamer->emitValue(MCSymbolRefExpr::create(Symbol1, OutContext),
8 /*size*/);
MCSymbol *Symbol2 = OutContext.getOrCreateSymbol(StringRef(".TOC."));
// Generates a R_PPC64_TOC relocation for TOC base insertion.
OutStreamer->emitValue(
MCSymbolRefExpr::create(Symbol2, MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
8/*size*/);
// Emit a null environment pointer.
OutStreamer->emitIntValue(0, 8 /* size */);
OutStreamer->SwitchSection(Current.first, Current.second);
}
void PPCLinuxAsmPrinter::emitEndOfAsmFile(Module &M) {
const DataLayout &DL = getDataLayout();
bool isPPC64 = DL.getPointerSizeInBits() == 64;
PPCTargetStreamer &TS =
static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
if (!TOC.empty()) {
const char *Name = isPPC64 ? ".toc" : ".got2";
MCSectionELF *Section = OutContext.getELFSection(
Name, ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
OutStreamer->SwitchSection(Section);
if (!isPPC64)
OutStreamer->emitValueToAlignment(4);
for (const auto &TOCMapPair : TOC) {
const MCSymbol *const TOCEntryTarget = TOCMapPair.first;
MCSymbol *const TOCEntryLabel = TOCMapPair.second;
OutStreamer->emitLabel(TOCEntryLabel);
if (isPPC64)
TS.emitTCEntry(*TOCEntryTarget);
else
OutStreamer->emitSymbolValue(TOCEntryTarget, 4);
}
}
PPCAsmPrinter::emitEndOfAsmFile(M);
}
/// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
void PPCLinuxAsmPrinter::emitFunctionBodyStart() {
// In the ELFv2 ABI, in functions that use the TOC register, we need to
// provide two entry points. The ABI guarantees that when calling the
// local entry point, r2 is set up by the caller to contain the TOC base
// for this function, and when calling the global entry point, r12 is set
// up by the caller to hold the address of the global entry point. We
// thus emit a prefix sequence along the following lines:
//
// func:
// .Lfunc_gepNN:
// # global entry point
// addis r2,r12,(.TOC.-.Lfunc_gepNN)@ha
// addi r2,r2,(.TOC.-.Lfunc_gepNN)@l
// .Lfunc_lepNN:
// .localentry func, .Lfunc_lepNN-.Lfunc_gepNN
// # local entry point, followed by function body
//
// For the Large code model, we create
//
// .Lfunc_tocNN:
// .quad .TOC.-.Lfunc_gepNN # done by EmitFunctionEntryLabel
// func:
// .Lfunc_gepNN:
// # global entry point
// ld r2,.Lfunc_tocNN-.Lfunc_gepNN(r12)
// add r2,r2,r12
// .Lfunc_lepNN:
// .localentry func, .Lfunc_lepNN-.Lfunc_gepNN
// # local entry point, followed by function body
//
// This ensures we have r2 set up correctly while executing the function
// body, no matter which entry point is called.
const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
const bool UsesX2OrR2 = !MF->getRegInfo().use_empty(PPC::X2) ||
!MF->getRegInfo().use_empty(PPC::R2);
// Only do all that if the function uses R2 as the TOC pointer
// in the first place. We don't need the global entry point if the
// function uses R2 as an allocatable register.
if (Subtarget->isELFv2ABI() && UsesX2OrR2 && PPCFI->usesTOCBasePtr()) {
// Note: The logic here must be synchronized with the code in the
// branch-selection pass which sets the offset of the first block in the
// function. This matters because it affects the alignment.
MCSymbol *GlobalEntryLabel = PPCFI->getGlobalEPSymbol();
OutStreamer->emitLabel(GlobalEntryLabel);
const MCSymbolRefExpr *GlobalEntryLabelExp =
MCSymbolRefExpr::create(GlobalEntryLabel, OutContext);
if (TM.getCodeModel() != CodeModel::Large) {
MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
const MCExpr *TOCDeltaExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
GlobalEntryLabelExp, OutContext);
const MCExpr *TOCDeltaHi = PPCMCExpr::createHa(TOCDeltaExpr, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
.addReg(PPC::X2)
.addReg(PPC::X12)
.addExpr(TOCDeltaHi));
const MCExpr *TOCDeltaLo = PPCMCExpr::createLo(TOCDeltaExpr, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI)
.addReg(PPC::X2)
.addReg(PPC::X2)
.addExpr(TOCDeltaLo));
} else {
MCSymbol *TOCOffset = PPCFI->getTOCOffsetSymbol();
const MCExpr *TOCOffsetDeltaExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCOffset, OutContext),
GlobalEntryLabelExp, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
.addReg(PPC::X2)
.addExpr(TOCOffsetDeltaExpr)
.addReg(PPC::X12));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD8)
.addReg(PPC::X2)
.addReg(PPC::X2)
.addReg(PPC::X12));
}
MCSymbol *LocalEntryLabel = PPCFI->getLocalEPSymbol();
OutStreamer->emitLabel(LocalEntryLabel);
const MCSymbolRefExpr *LocalEntryLabelExp =
MCSymbolRefExpr::create(LocalEntryLabel, OutContext);
const MCExpr *LocalOffsetExp =
MCBinaryExpr::createSub(LocalEntryLabelExp,
GlobalEntryLabelExp, OutContext);
PPCTargetStreamer *TS =
static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
if (TS)
TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym), LocalOffsetExp);
} else if (Subtarget->isELFv2ABI()) {
// When generating the entry point for a function we have a few scenarios
// based on whether or not that function uses R2 and whether or not that
// function makes calls (or is a leaf function).
// 1) A leaf function that does not use R2 (or treats it as callee-saved
// and preserves it). In this case st_other=0 and both
// the local and global entry points for the function are the same.
// No special entry point code is required.
// 2) A function uses the TOC pointer R2. This function may or may not have
// calls. In this case st_other=[2,6] and the global and local entry
// points are different. Code to correctly setup the TOC pointer in R2
// is put between the global and local entry points. This case is
// covered by the if statatement above.
// 3) A function does not use the TOC pointer R2 but does have calls.
// In this case st_other=1 since we do not know whether or not any
// of the callees clobber R2. This case is dealt with in this else if
// block.
// 4) The function does not use the TOC pointer but R2 is used inside
// the function. In this case st_other=1 once again.
// 5) This function uses inline asm. We mark R2 as reserved if the function
// has inline asm so we have to assume that it may be used.
if (MF->getFrameInfo().hasCalls() || MF->hasInlineAsm() ||
(!PPCFI->usesTOCBasePtr() && UsesX2OrR2)) {
PPCTargetStreamer *TS =
static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
if (TS)
TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym),
MCConstantExpr::create(1, OutContext));
}
}
}
/// EmitFunctionBodyEnd - Print the traceback table before the .size
/// directive.
///
void PPCLinuxAsmPrinter::emitFunctionBodyEnd() {
// Only the 64-bit target requires a traceback table. For now,
// we only emit the word of zeroes that GDB requires to find
// the end of the function, and zeroes for the eight-byte
// mandatory fields.
// FIXME: We should fill in the eight-byte mandatory fields as described in
// the PPC64 ELF ABI (this is a low-priority item because GDB does not
// currently make use of these fields).
if (Subtarget->isPPC64()) {
OutStreamer->emitIntValue(0, 4/*size*/);
OutStreamer->emitIntValue(0, 8/*size*/);
}
}
void PPCAIXAsmPrinter::SetupMachineFunction(MachineFunction &MF) {
// Setup CurrentFnDescSym and its containing csect.
MCSectionXCOFF *FnDescSec =
cast<MCSectionXCOFF>(getObjFileLowering().getSectionForFunctionDescriptor(
&MF.getFunction(), TM));
FnDescSec->setAlignment(Align(Subtarget->isPPC64() ? 8 : 4));
CurrentFnDescSym = FnDescSec->getQualNameSymbol();
return AsmPrinter::SetupMachineFunction(MF);
}
void PPCAIXAsmPrinter::ValidateGV(const GlobalVariable *GV) {
// Early error checking limiting what is supported.
if (GV->isThreadLocal())
report_fatal_error("Thread local not yet supported on AIX.");
if (GV->hasSection())
report_fatal_error("Custom section for Data not yet supported.");
if (GV->hasComdat())
report_fatal_error("COMDAT not yet supported by AIX.");
}
const MCExpr *PPCAIXAsmPrinter::lowerConstant(const Constant *CV) {
if (const Function *F = dyn_cast<Function>(CV)) {
MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
F->isDeclaration()
? getObjFileLowering().getSectionForExternalReference(F, TM)
: getObjFileLowering().getSectionForFunctionDescriptor(F, TM));
return MCSymbolRefExpr::create(Csect->getQualNameSymbol(), OutContext);
}
return PPCAsmPrinter::lowerConstant(CV);
}
static bool isSpecialLLVMGlobalArrayForStaticInit(const GlobalVariable *GV) {
return StringSwitch<bool>(GV->getName())
.Cases("llvm.global_ctors", "llvm.global_dtors", true)
.Default(false);
}
void PPCAIXAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
ValidateGV(GV);
// TODO: Update the handling of global arrays for static init when we support
// the ".ref" directive.
// Otherwise, we can skip these arrays, because the AIX linker collects
// static init functions simply based on their name.
if (isSpecialLLVMGlobalArrayForStaticInit(GV))
return;
// Create the symbol, set its storage class.
MCSymbolXCOFF *GVSym = cast<MCSymbolXCOFF>(getSymbol(GV));
GVSym->setStorageClass(
TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GV));
SectionKind GVKind;
// Create the containing csect and set it. We set it for externals as well,
// since this may not have been set elsewhere depending on how they are used.
MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
GV->isDeclaration()
? getObjFileLowering().getSectionForExternalReference(GV, TM)
: getObjFileLowering().SectionForGlobal(
GV, GVKind = getObjFileLowering().getKindForGlobal(GV, TM),
TM));
// External global variables are already handled.
if (GV->isDeclaration())
return;
if (!GVKind.isGlobalWriteableData() && !GVKind.isReadOnly())
report_fatal_error("Encountered a global variable kind that is "
"not supported yet.");
// Switch to the containing csect.
OutStreamer->SwitchSection(Csect);
const DataLayout &DL = GV->getParent()->getDataLayout();
// Handle common symbols.
if (GVKind.isCommon() || GVKind.isBSSLocal()) {
unsigned Align =
GV->getAlignment() ? GV->getAlignment() : DL.getPreferredAlignment(GV);
uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
if (GVKind.isBSSLocal())
OutStreamer->emitXCOFFLocalCommonSymbol(
GVSym, Size, Csect->getQualNameSymbol(), Align);
else
OutStreamer->emitCommonSymbol(Csect->getQualNameSymbol(), Size, Align);
return;
}
MCSymbol *EmittedInitSym = GVSym;
emitLinkage(GV, EmittedInitSym);
emitAlignment(getGVAlignment(GV, DL), GV);
OutStreamer->emitLabel(EmittedInitSym);
emitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
}
void PPCAIXAsmPrinter::emitFunctionDescriptor() {
const DataLayout &DL = getDataLayout();
const unsigned PointerSize = DL.getPointerSizeInBits() == 64 ? 8 : 4;
MCSectionSubPair Current = OutStreamer->getCurrentSection();
// Emit function descriptor.
OutStreamer->SwitchSection(
cast<MCSymbolXCOFF>(CurrentFnDescSym)->getRepresentedCsect());
// Emit function entry point address.
OutStreamer->emitValue(MCSymbolRefExpr::create(CurrentFnSym, OutContext),
PointerSize);
// Emit TOC base address.
const MCSymbol *TOCBaseSym =
cast<MCSectionXCOFF>(getObjFileLowering().getTOCBaseSection())
->getQualNameSymbol();
OutStreamer->emitValue(MCSymbolRefExpr::create(TOCBaseSym, OutContext),
PointerSize);
// Emit a null environment pointer.
OutStreamer->emitIntValue(0, PointerSize);
OutStreamer->SwitchSection(Current.first, Current.second);
}
void PPCAIXAsmPrinter::emitEndOfAsmFile(Module &M) {
// If there are no functions in this module, we will never need to reference
// the TOC base.
if (M.empty())
return;
// Switch to section to emit TOC base.
OutStreamer->SwitchSection(getObjFileLowering().getTOCBaseSection());
PPCTargetStreamer &TS =
static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
const unsigned EntryByteSize = Subtarget->isPPC64() ? 8 : 4;
const unsigned TOCEntriesByteSize = TOC.size() * EntryByteSize;
// TODO: If TOC entries' size is larger than 32768, then we run out of
// positive displacement to reach the TOC entry. We need to decide how to
// handle entries' size larger than that later.
if (TOCEntriesByteSize > 32767) {
report_fatal_error("Handling of TOC entry displacement larger than 32767 "
"is not yet implemented.");
}
for (auto &I : TOC) {
// Setup the csect for the current TC entry.
MCSectionXCOFF *TCEntry = cast<MCSectionXCOFF>(
getObjFileLowering().getSectionForTOCEntry(I.first));
OutStreamer->SwitchSection(TCEntry);
OutStreamer->emitLabel(I.second);
TS.emitTCEntry(*I.first);
}
}
MCSymbol *
PPCAIXAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) {
const GlobalObject *GO = nullptr;
// If the MO is a function or certain kind of globals, we want to make sure to
// refer to the csect symbol, otherwise we can just do the default handling.
if (MO.getType() != MachineOperand::MO_GlobalAddress ||
!(GO = dyn_cast<const GlobalObject>(MO.getGlobal())))
return PPCAsmPrinter::getMCSymbolForTOCPseudoMO(MO);
// Do an early error check for globals we don't support. This will go away
// eventually.
const auto *GV = dyn_cast<const GlobalVariable>(GO);
if (GV) {
ValidateGV(GV);
}
// If the global object is a global variable without initializer or is a
// declaration of a function, then XSym is an external referenced symbol.
// Hence we may need to explictly create a MCSectionXCOFF for it so that we
// can return its symbol later.
if (GO->isDeclaration()) {
return cast<MCSectionXCOFF>(
getObjFileLowering().getSectionForExternalReference(GO, TM))
->getQualNameSymbol();
}
// Handle initialized global variables and defined functions.
SectionKind GOKind = getObjFileLowering().getKindForGlobal(GO, TM);
if (GOKind.isText()) {
// If the MO is a function, we want to make sure to refer to the function
// descriptor csect.
return cast<MCSectionXCOFF>(
getObjFileLowering().getSectionForFunctionDescriptor(
cast<const Function>(GO), TM))
->getQualNameSymbol();
} else if (GOKind.isCommon() || GOKind.isBSSLocal()) {
// If the operand is a common then we should refer to the csect symbol.
return cast<MCSectionXCOFF>(
getObjFileLowering().SectionForGlobal(GO, GOKind, TM))
->getQualNameSymbol();
}
// Other global variables are refered to by labels inside of a single csect,
// so refer to the label directly.
return getSymbol(GV);
}
/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
/// for a MachineFunction to the given output stream, in a format that the
/// Darwin assembler can deal with.
///
static AsmPrinter *
createPPCAsmPrinterPass(TargetMachine &tm,
std::unique_ptr<MCStreamer> &&Streamer) {
if (tm.getTargetTriple().isOSAIX())
return new PPCAIXAsmPrinter(tm, std::move(Streamer));
return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
}
// Force static initialization.
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCAsmPrinter() {
TargetRegistry::RegisterAsmPrinter(getThePPC32Target(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64Target(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64LETarget(),
createPPCAsmPrinterPass);
}
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