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llvm-project/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
diggerlin 83ec9b51ed [AIX] Use csect reference for function address constants 
SUMMARY:
We currently emit a reference for function address constants as labels;
for example:

foo_ptr:
.long foo
however, there may be no such label in the case where the function is
undefined. Although the label exists when the function is defined, we
will (to be consistent) also use a csect reference in that case.

Address one comment
https://reviews.llvm.org/D71144#inline-653255

Reviewers: daltenty,hubert.reinterpretcast,jasonliu,Xiangling_L
Subscribers: cebowleratibm, wuzish, nemanjai

Differential Revision: https://reviews.llvm.org/D71144
2020-01-06 11:45:00 -05:00

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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";
}
bool doFinalization(Module &M) override;
void EmitStartOfAsmFile(Module &M) override;
void EmitFunctionEntryLabel() override;
void EmitFunctionBodyStart() override;
void EmitFunctionBodyEnd() override;
void EmitInstruction(const MachineInstr *MI) override;
};
/// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
/// OS X
class PPCDarwinAsmPrinter : public PPCAsmPrinter {
public:
explicit PPCDarwinAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: PPCAsmPrinter(TM, std::move(Streamer)) {}
StringRef getPassName() const override {
return "Darwin PPC Assembly Printer";
}
bool doFinalization(Module &M) override;
void EmitStartOfAsmFile(Module &M) 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();
MCSymbol *SymToPrint;
// External or weakly linked global variables need non-lazily-resolved stubs
if (Subtarget->hasLazyResolverStub(GV)) {
SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
MachineModuleInfoImpl::StubValueTy &StubSym =
MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(
SymToPrint);
if (!StubSym.getPointer())
StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(GV),
!GV->hasInternalLinkage());
} else {
SymToPrint = getSymbol(GV);
}
SymToPrint->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?
if (!Subtarget->isDarwin())
RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
O << 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
{
const char *RegName = "r0";
if (!Subtarget->isDarwin())
RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
O << RegName << ", ";
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->isPPC64() && !Subtarget->isDarwin() &&
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 IsDarwin = TM.getTargetTriple().isOSDarwin();
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$pb@l
// Get the offset from the GOT Base Register to the GOT
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
if (Subtarget->isSecurePlt() && isPositionIndependent() ) {
unsigned PICR = TmpInst.getOperand(0).getReg();
MCSymbol *BaseSymbol = OutContext.getOrCreateSymbol(
M->getPICLevel() == PICLevel::SmallPIC ? "_GLOBAL_OFFSET_TABLE_"
: ".LTOC");
const MCExpr *PB =
MCSymbolRefExpr::create(MF->getPICBaseSymbol(), OutContext);
const MCExpr *DeltaExpr = MCBinaryExpr::createSub(
MCSymbolRefExpr::create(BaseSymbol, OutContext), PB, OutContext);
const MCExpr *DeltaHi = PPCMCExpr::createHa(DeltaExpr, false, OutContext);
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ADDIS).addReg(PICR).addReg(PICR).addExpr(DeltaHi));
const MCExpr *DeltaLo = PPCMCExpr::createLo(DeltaExpr, false, OutContext);
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ADDI).addReg(PICR).addReg(PICR).addExpr(DeltaLo));
return;
} else {
MCSymbol *PICOffset =
MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
TmpInst.setOpcode(PPC::LWZ);
const MCExpr *Exp =
MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
const MCExpr *PB =
MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
MCSymbolRefExpr::VK_None,
OutContext);
const MCOperand TR = TmpInst.getOperand(1);
const MCOperand PICR = TmpInst.getOperand(0);
// Step 1: lwz %rt, .L$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: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct.");
// Transform %rN = LWZtoc @op1, %r2
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// 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: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %x3 = LDtoc @min1, %x2
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// 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, IsDarwin);
// 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, IsDarwin);
// 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: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %xd = ADDIStocHA8 %x2, @sym
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// 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: {
assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
// Transform %xd = LDtocL @sym, %xs
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
// 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, IsDarwin);
// 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, IsDarwin);
// 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.
if (!IsDarwin) {
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, IsDarwin);
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, false))
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);
}
bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
const DataLayout &DL = getDataLayout();
bool isPPC64 = DL.getPointerSizeInBits() == 64;
PPCTargetStreamer &TS =
static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
if (!TOC.empty()) {
MCSectionELF *Section;
if (isPPC64)
Section = OutStreamer->getContext().getELFSection(
".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
else
Section = OutStreamer->getContext().getELFSection(
".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
OutStreamer->SwitchSection(Section);
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->EmitValueToAlignment(4);
OutStreamer->EmitSymbolValue(TOCEntryTarget, 4);
}
}
}
return AsmPrinter::doFinalization(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.
if (Subtarget->isELFv2ABI()
// Only do all that if the function uses r2 in the first place.
&& !MF->getRegInfo().use_empty(PPC::X2)) {
// 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.
const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
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, false, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
.addReg(PPC::X2)
.addReg(PPC::X12)
.addExpr(TOCDeltaHi));
const MCExpr *TOCDeltaLo =
PPCMCExpr::createLo(TOCDeltaExpr, false, 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);
}
}
/// 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 PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
static const char *const CPUDirectives[] = {
"",
"ppc",
"ppc440",
"ppc601",
"ppc602",
"ppc603",
"ppc7400",
"ppc750",
"ppc970",
"ppcA2",
"ppce500",
"ppce500mc",
"ppce5500",
"power3",
"power4",
"power5",
"power5x",
"power6",
"power6x",
"power7",
// FIXME: why is power8 missing here?
"ppc64",
"ppc64le",
"power9",
"future"
};
// Get the numerically largest directive.
// FIXME: How should we merge darwin directives?
unsigned Directive = PPC::DIR_NONE;
for (const Function &F : M) {
const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
unsigned FDir = STI.getCPUDirective();
Directive = Directive > FDir ? FDir : STI.getCPUDirective();
if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
Directive = PPC::DIR_970;
if (STI.hasAltivec() && Directive < PPC::DIR_7400)
Directive = PPC::DIR_7400;
if (STI.isPPC64() && Directive < PPC::DIR_64)
Directive = PPC::DIR_64;
}
assert(Directive <= PPC::DIR_64 && "Directive out of range.");
assert(Directive < array_lengthof(CPUDirectives) &&
"CPUDirectives[] might not be up-to-date!");
PPCTargetStreamer &TStreamer =
*static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
TStreamer.emitMachine(CPUDirectives[Directive]);
// Prime text sections so they are adjacent. This reduces the likelihood a
// large data or debug section causes a branch to exceed 16M limit.
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
OutStreamer->SwitchSection(TLOFMacho.getTextCoalSection());
if (TM.getRelocationModel() == Reloc::PIC_) {
OutStreamer->SwitchSection(
OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
MachO::S_SYMBOL_STUBS |
MachO::S_ATTR_PURE_INSTRUCTIONS,
32, SectionKind::getText()));
} else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
OutStreamer->SwitchSection(
OutContext.getMachOSection("__TEXT","__symbol_stub1",
MachO::S_SYMBOL_STUBS |
MachO::S_ATTR_PURE_INSTRUCTIONS,
16, SectionKind::getText()));
}
OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
}
bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
// Darwin/PPC always uses mach-o.
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
if (MMI) {
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
if (MAI->doesSupportExceptionHandling()) {
// Add the (possibly multiple) personalities to the set of global values.
// Only referenced functions get into the Personalities list.
for (const Function *Personality : MMI->getPersonalities()) {
if (Personality) {
MCSymbol *NLPSym =
getSymbolWithGlobalValueBase(Personality, "$non_lazy_ptr");
MachineModuleInfoImpl::StubValueTy &StubSym =
MMIMacho.getGVStubEntry(NLPSym);
StubSym =
MachineModuleInfoImpl::StubValueTy(getSymbol(Personality), true);
}
}
}
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetGVStubList();
// Output macho stubs for external and common global variables.
if (!Stubs.empty()) {
// Switch with ".non_lazy_symbol_pointer" directive.
OutStreamer->SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
EmitAlignment(isPPC64 ? Align(8) : Align(4));
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer->EmitLabel(Stubs[i].first);
// .indirect_symbol _foo
MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
OutStreamer->EmitSymbolAttribute(MCSym.getPointer(),
MCSA_IndirectSymbol);
if (MCSym.getInt())
// External to current translation unit.
OutStreamer->EmitIntValue(0, isPPC64 ? 8 : 4 /*size*/);
else
// Internal to current translation unit.
//
// When we place the LSDA into the TEXT section, the type info
// pointers
// need to be indirect and pc-rel. We accomplish this by using NLPs.
// However, sometimes the types are local to the file. So we need to
// fill in the value for the NLP in those cases.
OutStreamer->EmitValue(
MCSymbolRefExpr::create(MCSym.getPointer(), OutContext),
isPPC64 ? 8 : 4 /*size*/);
}
Stubs.clear();
OutStreamer->AddBlankLine();
}
}
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never generates
// code that does this, it is always safe to set.
OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
return AsmPrinter::doFinalization(M);
}
void PPCAIXAsmPrinter::SetupMachineFunction(MachineFunction &MF) {
// Get the function descriptor symbol.
CurrentFnDescSym = getSymbol(&MF.getFunction());
// Set the containing csect.
MCSectionXCOFF *FnDescSec = OutStreamer->getContext().getXCOFFSection(
CurrentFnDescSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD,
XCOFF::C_HIDEXT, SectionKind::getData());
cast<MCSymbolXCOFF>(CurrentFnDescSym)->setContainingCsect(FnDescSec);
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)) {
MCSymbolXCOFF *FSym = cast<MCSymbolXCOFF>(getSymbol(F));
if (!FSym->hasContainingCsect()) {
const XCOFF::StorageClass SC =
F->isDeclaration()
? TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(F)
: XCOFF::C_HIDEXT;
MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection(
FSym->getName(), XCOFF::XMC_DS,
F->isDeclaration() ? XCOFF::XTY_ER : XCOFF::XTY_SD, SC,
SectionKind::getData());
FSym->setContainingCsect(Csect);
}
return MCSymbolRefExpr::create(
FSym->getContainingCsect()->getQualNameSymbol(), OutContext);
}
return PPCAsmPrinter::lowerConstant(CV);
}
void PPCAIXAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
ValidateGV(GV);
// External global variables are already handled.
if (!GV->hasInitializer())
return;
// Create the symbol, set its storage class.
MCSymbolXCOFF *GVSym = cast<MCSymbolXCOFF>(getSymbol(GV));
GVSym->setStorageClass(
TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GV));
SectionKind GVKind = getObjFileLowering().getKindForGlobal(GV, TM);
if ((!GVKind.isCommon() && !GVKind.isBSS() && !GVKind.isData() &&
!GVKind.isReadOnly()) ||
GVKind.isMergeable2ByteCString() || GVKind.isMergeable4ByteCString() ||
GVKind.isMergeableConst())
report_fatal_error("Encountered a global variable kind that is "
"not supported yet.");
// Create the containing csect and switch to it.
MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
getObjFileLowering().SectionForGlobal(GV, GVKind, TM));
OutStreamer->SwitchSection(Csect);
GVSym->setContainingCsect(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)->getContainingCsect());
OutStreamer->EmitLabel(CurrentFnDescSym);
// Emit function entry point address.
OutStreamer->EmitValue(MCSymbolRefExpr::create(CurrentFnSym, OutContext),
PointerSize);
// Emit TOC base address.
const MCSectionXCOFF *TOCBaseSec = OutStreamer->getContext().getXCOFFSection(
StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT,
SectionKind::getData());
const MCSymbol *TOCBaseSym = TOCBaseSec->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;
// Emit TOC base.
MCSectionXCOFF *TOCBaseSection = OutStreamer->getContext().getXCOFFSection(
StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT,
SectionKind::getData());
// The TOC-base always has 0 size, but 4 byte alignment.
TOCBaseSection->setAlignment(Align(4));
// Switch to section to emit TOC base.
OutStreamer->SwitchSection(TOCBaseSection);
PPCTargetStreamer &TS =
static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
for (auto &I : TOC) {
// Setup the csect for the current TC entry.
MCSectionXCOFF *TCEntry = OutStreamer->getContext().getXCOFFSection(
cast<MCSymbolXCOFF>(I.first)->getUnqualifiedName(), XCOFF::XMC_TC,
XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getData());
cast<MCSymbolXCOFF>(I.second)->setContainingCsect(TCEntry);
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);
}
MCSymbolXCOFF *XSym = cast<MCSymbolXCOFF>(getSymbol(GO));
// 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()) {
if (!XSym->hasContainingCsect()) {
// Make sure the storage class is set.
const XCOFF::StorageClass SC =
TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GO);
XSym->setStorageClass(SC);
MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection(
XSym->getName(), isa<Function>(GO) ? XCOFF::XMC_DS : XCOFF::XMC_UA,
XCOFF::XTY_ER, SC, SectionKind::getMetadata());
XSym->setContainingCsect(Csect);
}
return XSym->getContainingCsect()->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 OutStreamer->getContext()
.getXCOFFSection(XSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD,
XCOFF::C_HIDEXT, SectionKind::getData())
->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().isMacOSX())
return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
if (tm.getTargetTriple().isOSAIX())
return new PPCAIXAsmPrinter(tm, std::move(Streamer));
return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
}
// Force static initialization.
extern "C" void LLVMInitializePowerPCAsmPrinter() {
TargetRegistry::RegisterAsmPrinter(getThePPC32Target(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64Target(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64LETarget(),
createPPCAsmPrinterPass);
}
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