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llvm-mirror/lib/Target/PowerPC/PPCAsmPrinter.cpp
Nemanja Ivanovic 8b3f85a32c [PowerPC] Turn deprecated altivec prefetch instrs to nops on AIX 
The dst/dstt/dstst/dststt instructions are nop's on all PowerPC
cores that AIX supports. The AIX assembler also does not accept
these mnemonics. Turn them into nop's on AIX (similar to dstall).
2021-07-27 15:50:02 -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/SmallPtrSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.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/MCDirectives.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCSectionELF.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/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <memory>
#include <new>
using namespace llvm;
using namespace llvm::XCOFF;
#define DEBUG_TYPE "asmprinter"
static cl::opt<bool> EnableSSPCanaryBitInTB(
"aix-ssp-tb-bit", cl::init(false),
cl::desc("Enable Passing SSP Canary info in Trackback on AIX"), cl::Hidden);
// Specialize DenseMapInfo to allow
// std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind> in DenseMap.
// This specialization is needed here because that type is used as keys in the
// map representing TOC entries.
namespace llvm {
template <>
struct DenseMapInfo<std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>> {
using TOCKey = std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>;
static inline TOCKey getEmptyKey() {
return {nullptr, MCSymbolRefExpr::VariantKind::VK_None};
}
static inline TOCKey getTombstoneKey() {
return {nullptr, MCSymbolRefExpr::VariantKind::VK_Invalid};
}
static unsigned getHashValue(const TOCKey &PairVal) {
return detail::combineHashValue(
DenseMapInfo<const MCSymbol *>::getHashValue(PairVal.first),
DenseMapInfo<int>::getHashValue(PairVal.second));
}
static bool isEqual(const TOCKey &A, const TOCKey &B) { return A == B; }
};
} // end namespace llvm
namespace {
class PPCAsmPrinter : public AsmPrinter {
protected:
// For TLS on AIX, we need to be able to identify TOC entries of specific
// VariantKind so we can add the right relocations when we generate the
// entries. So each entry is represented by a pair of MCSymbol and
// VariantKind. For example, we need to be able to identify the following
// entry as a TLSGD entry so we can add the @m relocation:
// .tc .i[TC],i[TL]@m
// By default, VK_None is used for the VariantKind.
MapVector<std::pair<const MCSymbol *, MCSymbolRefExpr::VariantKind>,
MCSymbol *>
TOC;
const PPCSubtarget *Subtarget = nullptr;
StackMaps SM;
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,
MCSymbolRefExpr::VariantKind Kind =
MCSymbolRefExpr::VariantKind::VK_None);
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:
/// Symbols lowered from ExternalSymbolSDNodes, we will need to emit extern
/// linkage for them in AIX.
SmallPtrSet<MCSymbol *, 8> ExtSymSDNodeSymbols;
/// A format indicator and unique trailing identifier to form part of the
/// sinit/sterm function names.
std::string FormatIndicatorAndUniqueModId;
// Record a list of GlobalAlias associated with a GlobalObject.
// This is used for AIX's extra-label-at-definition aliasing strategy.
DenseMap<const GlobalObject *, SmallVector<const GlobalAlias *, 1>>
GOAliasMap;
uint16_t getNumberOfVRSaved();
void emitTracebackTable();
SmallVector<const GlobalVariable *, 8> TOCDataGlobalVars;
void emitGlobalVariableHelper(const GlobalVariable *);
public:
PPCAIXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
: PPCAsmPrinter(TM, std::move(Streamer)) {
if (MAI->isLittleEndian())
report_fatal_error(
"cannot create AIX PPC Assembly Printer for a little-endian target");
}
StringRef getPassName() const override { return "AIX PPC Assembly Printer"; }
bool doInitialization(Module &M) override;
void emitXXStructorList(const DataLayout &DL, const Constant *List,
bool IsCtor) override;
void SetupMachineFunction(MachineFunction &MF) override;
void emitGlobalVariable(const GlobalVariable *GV) override;
void emitFunctionDescriptor() override;
void emitFunctionEntryLabel() override;
void emitFunctionBodyEnd() override;
void emitEndOfAsmFile(Module &) override;
void emitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const override;
void emitInstruction(const MachineInstr *MI) override;
bool doFinalization(Module &M) override;
void emitTTypeReference(const GlobalValue *GV, unsigned Encoding) 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 'L': // A memory reference to the upper word of a double word op.
O << getDataLayout().getPointerSize() << "(";
printOperand(MI, OpNo, O);
O << ")";
return false;
case 'y': // A memory reference for an X-form instruction
O << "0, ";
printOperand(MI, OpNo, O);
return false;
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 '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,
MCSymbolRefExpr::VariantKind Kind) {
MCSymbol *&TOCEntry = TOC[{Sym, Kind}];
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));
}
/// This helper function creates the TlsGetAddr MCSymbol for AIX. We will
/// create the csect and use the qual-name symbol instead of creating just the
/// external symbol.
static MCSymbol *createMCSymbolForTlsGetAddr(MCContext &Ctx) {
return Ctx
.getXCOFFSection(".__tls_get_addr", SectionKind::getText(),
XCOFF::CsectProperties(XCOFF::XMC_PR, XCOFF::XTY_ER))
->getQualNameSymbol();
}
/// 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) {
MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
unsigned Opcode = PPC::BL8_NOP_TLS;
assert(MI->getNumOperands() >= 3 && "Expecting at least 3 operands from MI");
if (MI->getOperand(2).getTargetFlags() == PPCII::MO_GOT_TLSGD_PCREL_FLAG ||
MI->getOperand(2).getTargetFlags() == PPCII::MO_GOT_TLSLD_PCREL_FLAG) {
Kind = MCSymbolRefExpr::VK_PPC_NOTOC;
Opcode = PPC::BL8_NOTOC_TLS;
}
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->isAIXABI()) {
// On AIX, the variable offset should already be in R4 and the region handle
// should already be in R3.
// For TLSGD, which currently is the only supported access model, we only
// need to generate an absolute branch to .__tls_get_addr.
Register VarOffsetReg = Subtarget->isPPC64() ? PPC::X4 : PPC::R4;
(void)VarOffsetReg;
assert(MI->getOperand(2).isReg() &&
MI->getOperand(2).getReg() == VarOffsetReg &&
"GETtls[ld]ADDR[32] must read GPR4");
MCSymbol *TlsGetAddr = createMCSymbolForTlsGetAddr(OutContext);
const MCExpr *TlsRef = MCSymbolRefExpr::create(
TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BLA).addExpr(TlsRef));
return;
}
MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol("__tls_get_addr");
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() ? Opcode
: (unsigned)PPC::BL_TLS)
.addExpr(TlsRef)
.addExpr(SymVar));
}
/// Map a machine operand for a TOC pseudo-machine instruction to its
/// corresponding MCSymbol.
static MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO,
AsmPrinter &AP) {
switch (MO.getType()) {
case MachineOperand::MO_GlobalAddress:
return AP.getSymbol(MO.getGlobal());
case MachineOperand::MO_ConstantPoolIndex:
return AP.GetCPISymbol(MO.getIndex());
case MachineOperand::MO_JumpTableIndex:
return AP.GetJTISymbol(MO.getIndex());
case MachineOperand::MO_BlockAddress:
return AP.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::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
auto getTOCRelocAdjustedExprForXCOFF = [this](const MCExpr *Expr,
ptrdiff_t OriginalOffset) {
// Apply an offset to the TOC-based expression such that the adjusted
// notional offset from the TOC base (to be encoded into the instruction's D
// or DS field) is the signed 16-bit truncation of the original notional
// offset from the TOC base.
// This is consistent with the treatment used both by XL C/C++ and
// by AIX ld -r.
ptrdiff_t Adjustment =
OriginalOffset - llvm::SignExtend32<16>(OriginalOffset);
return MCBinaryExpr::createAdd(
Expr, MCConstantExpr::create(-Adjustment, OutContext), OutContext);
};
auto getTOCEntryLoadingExprForXCOFF =
[IsPPC64, getTOCRelocAdjustedExprForXCOFF,
this](const MCSymbol *MOSymbol, const MCExpr *Expr,
MCSymbolRefExpr::VariantKind VK =
MCSymbolRefExpr::VariantKind::VK_None) -> const MCExpr * {
const unsigned EntryByteSize = IsPPC64 ? 8 : 4;
const auto TOCEntryIter = TOC.find({MOSymbol, VK});
assert(TOCEntryIter != TOC.end() &&
"Could not find the TOC entry for this symbol.");
const ptrdiff_t EntryDistanceFromTOCBase =
(TOCEntryIter - TOC.begin()) * EntryByteSize;
constexpr int16_t PositiveTOCRange = INT16_MAX;
if (EntryDistanceFromTOCBase > PositiveTOCRange)
return getTOCRelocAdjustedExprForXCOFF(Expr, EntryDistanceFromTOCBase);
return Expr;
};
auto GetVKForMO = [&](const MachineOperand &MO) {
// For GD TLS access on AIX, we have two TOC entries for the symbol (one for
// the variable offset and the other for the region handle). They are
// differentiated by MO_TLSGD_FLAG and MO_TLSGDM_FLAG.
if (MO.getTargetFlags() & PPCII::MO_TLSGDM_FLAG)
return MCSymbolRefExpr::VariantKind::VK_PPC_AIX_TLSGDM;
if (MO.getTargetFlags() & PPCII::MO_TLSGD_FLAG)
return MCSymbolRefExpr::VariantKind::VK_PPC_AIX_TLSGD;
return MCSymbolRefExpr::VariantKind::VK_None;
};
// 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(*MF);
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, *this);
// 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;
}
MCSymbolRefExpr::VariantKind VK = GetVKForMO(MO);
// 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, VK);
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.");
Exp = getTOCEntryLoadingExprForXCOFF(MOSymbol, Exp, VK);
TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
// Print MO for better readability
if (isVerbose())
OutStreamer->GetCommentOS() << MO << '\n';
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::ADDItoc: {
assert(IsAIX && TM.getCodeModel() == CodeModel::Small &&
"Operand only valid in AIX 32 bit mode");
// Transform %rN = ADDItoc @op1, %r2.
LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
// Change the opcode to load address.
TmpInst.setOpcode(PPC::LA);
const MachineOperand &MO = MI->getOperand(1);
assert(MO.isGlobal() && "Invalid operand for ADDItoc.");
// Map the operand to its corresponding MCSymbol.
const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO, *this);
const MCExpr *Exp =
MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_None, OutContext);
TmpInst.getOperand(1) = TmpInst.getOperand(2);
TmpInst.getOperand(2) = 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 operand to its corresponding MCSymbol.
const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO, *this);
MCSymbolRefExpr::VariantKind VK = GetVKForMO(MO);
// 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(MOSymbol, VK);
MCSymbolRefExpr::VariantKind VKExpr =
IsAIX ? MCSymbolRefExpr::VK_None : MCSymbolRefExpr::VK_PPC_TOC;
const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry, VKExpr, OutContext);
TmpInst.getOperand(1) = MCOperand::createExpr(
IsAIX ? getTOCEntryLoadingExprForXCOFF(MOSymbol, Exp, VK) : Exp);
// Print MO for better readability
if (isVerbose() && IsAIX)
OutStreamer->GetCommentOS() << MO << '\n';
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, *this);
MCSymbolRefExpr::VariantKind VK = GetVKForMO(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, VK);
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, *this);
MCSymbolRefExpr::VariantKind VK = GetVKForMO(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, VK);
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, *this);
MCSymbolRefExpr::VariantKind VK = GetVKForMO(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, VK);
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, *this);
MCSymbolRefExpr::VariantKind VK = GetVKForMO(MO);
if (!MO.isCPI() || TM.getCodeModel() == CodeModel::Large)
MOSymbol = lookUpOrCreateTOCEntry(MOSymbol, VK);
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, *this),
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::GETtlsADDRPCREL:
case PPC::GETtlsADDR32AIX:
case PPC::GETtlsADDR64AIX:
// Transform: %r3 = GETtlsADDRNNAIX %r3, %r4 (for NN == 32/64).
// Into: BLA .__tls_get_addr()
// Unlike on Linux, there is no symbol or relocation needed for this call.
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::GETtlsldADDRPCREL:
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::PADDIdtprel: {
// Transform: %rd = PADDIdtprel %rs, @sym
// Into: %rd = PADDI8 %rs, sym@dtprel
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);
const MCExpr *SymDtprel = MCSymbolRefExpr::create(
MOSymbol, MCSymbolRefExpr::VK_DTPREL, OutContext);
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::PADDI8)
.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.
unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
const MachineOperand &MO = MI->getOperand(OpNum);
if (MO.isGlobal()) {
const DataLayout &DL = MO.getGlobal()->getParent()->getDataLayout();
if (MO.getGlobal()->getPointerAlignment(DL) < 4)
llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
}
// Now process the instruction normally.
break;
}
case PPC::PseudoEIEIO: {
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ORI).addReg(PPC::X2).addReg(PPC::X2).addImm(0));
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ORI).addReg(PPC::X2).addReg(PPC::X2).addImm(0));
EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::EnforceIEIO));
return;
}
}
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, 2);
break;
}
case TargetOpcode::PATCHABLE_RET: {
unsigned RetOpcode = MI->getOperand(0).getImm();
MCInst RetInst;
RetInst.setOpcode(RetOpcode);
for (const auto &MO : llvm::drop_begin(MI->operands())) {
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, 2);
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(*MF);
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(*MF);
const MCExpr *TOCDeltaExpr =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
MCSymbolRefExpr::create(GlobalEPSymbol,
OutContext),
OutContext);
OutStreamer->emitLabel(PPCFI->getTOCOffsetSymbol(*MF));
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.first;
MCSymbol *const TOCEntryLabel = TOCMapPair.second;
OutStreamer->emitLabel(TOCEntryLabel);
if (isPPC64 && TS != nullptr)
TS->emitTCEntry(*TOCEntryTarget, TOCMapPair.first.second);
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);
const bool PCrelGEPRequired = Subtarget->isUsingPCRelativeCalls() &&
UsesX2OrR2 && PPCFI->usesTOCBasePtr();
const bool NonPCrelGEPRequired = !Subtarget->isUsingPCRelativeCalls() &&
Subtarget->isELFv2ABI() && UsesX2OrR2;
// 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 (NonPCrelGEPRequired || PCrelGEPRequired) {
// 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(*MF);
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(*MF);
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(*MF);
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->isUsingPCRelativeCalls()) {
// 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. Tail calls are considered calls and the st_other should also
// be set to 1 in that case as well.
// 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 as we have to assume that it may be used.
if (MF->getFrameInfo().hasCalls() || MF->getFrameInfo().hasTailCall() ||
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::emitLinkage(const GlobalValue *GV,
MCSymbol *GVSym) const {
assert(MAI->hasVisibilityOnlyWithLinkage() &&
"AIX's linkage directives take a visibility setting.");
MCSymbolAttr LinkageAttr = MCSA_Invalid;
switch (GV->getLinkage()) {
case GlobalValue::ExternalLinkage:
LinkageAttr = GV->isDeclaration() ? MCSA_Extern : MCSA_Global;
break;
case GlobalValue::LinkOnceAnyLinkage:
case GlobalValue::LinkOnceODRLinkage:
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::ExternalWeakLinkage:
LinkageAttr = MCSA_Weak;
break;
case GlobalValue::AvailableExternallyLinkage:
LinkageAttr = MCSA_Extern;
break;
case GlobalValue::PrivateLinkage:
return;
case GlobalValue::InternalLinkage:
assert(GV->getVisibility() == GlobalValue::DefaultVisibility &&
"InternalLinkage should not have other visibility setting.");
LinkageAttr = MCSA_LGlobal;
break;
case GlobalValue::AppendingLinkage:
llvm_unreachable("Should never emit this");
case GlobalValue::CommonLinkage:
llvm_unreachable("CommonLinkage of XCOFF should not come to this path");
}
assert(LinkageAttr != MCSA_Invalid && "LinkageAttr should not MCSA_Invalid.");
MCSymbolAttr VisibilityAttr = MCSA_Invalid;
if (!TM.getIgnoreXCOFFVisibility()) {
switch (GV->getVisibility()) {
// TODO: "exported" and "internal" Visibility needs to go here.
case GlobalValue::DefaultVisibility:
break;
case GlobalValue::HiddenVisibility:
VisibilityAttr = MAI->getHiddenVisibilityAttr();
break;
case GlobalValue::ProtectedVisibility:
VisibilityAttr = MAI->getProtectedVisibilityAttr();
break;
}
}
OutStreamer->emitXCOFFSymbolLinkageWithVisibility(GVSym, LinkageAttr,
VisibilityAttr);
}
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);
}
uint16_t PPCAIXAsmPrinter::getNumberOfVRSaved() {
// Calculate the number of VRs be saved.
// Vector registers 20 through 31 are marked as reserved and cannot be used
// in the default ABI.
const PPCSubtarget &Subtarget = MF->getSubtarget<PPCSubtarget>();
if (Subtarget.isAIXABI() && Subtarget.hasAltivec() &&
TM.getAIXExtendedAltivecABI()) {
const MachineRegisterInfo &MRI = MF->getRegInfo();
for (unsigned Reg = PPC::V20; Reg <= PPC::V31; ++Reg)
if (MRI.isPhysRegModified(Reg))
// Number of VRs saved.
return PPC::V31 - Reg + 1;
}
return 0;
}
void PPCAIXAsmPrinter::emitFunctionBodyEnd() {
if (!TM.getXCOFFTracebackTable())
return;
emitTracebackTable();
// If ShouldEmitEHBlock returns true, then the eh info table
// will be emitted via `AIXException::endFunction`. Otherwise, we
// need to emit a dumy eh info table when VRs are saved. We could not
// consolidate these two places into one because there is no easy way
// to access register information in `AIXException` class.
if (!TargetLoweringObjectFileXCOFF::ShouldEmitEHBlock(MF) &&
(getNumberOfVRSaved() > 0)) {
// Emit dummy EH Info Table.
OutStreamer->SwitchSection(getObjFileLowering().getCompactUnwindSection());
MCSymbol *EHInfoLabel =
TargetLoweringObjectFileXCOFF::getEHInfoTableSymbol(MF);
OutStreamer->emitLabel(EHInfoLabel);
// Version number.
OutStreamer->emitInt32(0);
const DataLayout &DL = MMI->getModule()->getDataLayout();
const unsigned PointerSize = DL.getPointerSize();
// Add necessary paddings in 64 bit mode.
OutStreamer->emitValueToAlignment(PointerSize);
OutStreamer->emitIntValue(0, PointerSize);
OutStreamer->emitIntValue(0, PointerSize);
OutStreamer->SwitchSection(MF->getSection());
}
}
void PPCAIXAsmPrinter::emitTracebackTable() {
// Create a symbol for the end of function.
MCSymbol *FuncEnd = createTempSymbol(MF->getName());
OutStreamer->emitLabel(FuncEnd);
OutStreamer->AddComment("Traceback table begin");
// Begin with a fullword of zero.
OutStreamer->emitIntValueInHexWithPadding(0, 4 /*size*/);
SmallString<128> CommentString;
raw_svector_ostream CommentOS(CommentString);
auto EmitComment = [&]() {
OutStreamer->AddComment(CommentOS.str());
CommentString.clear();
};
auto EmitCommentAndValue = [&](uint64_t Value, int Size) {
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(Value, Size);
};
unsigned int Version = 0;
CommentOS << "Version = " << Version;
EmitCommentAndValue(Version, 1);
// There is a lack of information in the IR to assist with determining the
// source language. AIX exception handling mechanism would only search for
// personality routine and LSDA area when such language supports exception
// handling. So to be conservatively correct and allow runtime to do its job,
// we need to set it to C++ for now.
TracebackTable::LanguageID LanguageIdentifier =
TracebackTable::CPlusPlus; // C++
CommentOS << "Language = "
<< getNameForTracebackTableLanguageId(LanguageIdentifier);
EmitCommentAndValue(LanguageIdentifier, 1);
// This is only populated for the third and fourth bytes.
uint32_t FirstHalfOfMandatoryField = 0;
// Emit the 3rd byte of the mandatory field.
// We always set traceback offset bit to true.
FirstHalfOfMandatoryField |= TracebackTable::HasTraceBackTableOffsetMask;
const PPCFunctionInfo *FI = MF->getInfo<PPCFunctionInfo>();
const MachineRegisterInfo &MRI = MF->getRegInfo();
// Check the function uses floating-point processor instructions or not
for (unsigned Reg = PPC::F0; Reg <= PPC::F31; ++Reg) {
if (MRI.isPhysRegUsed(Reg, /* SkipRegMaskTest */ true)) {
FirstHalfOfMandatoryField |= TracebackTable::IsFloatingPointPresentMask;
break;
}
}
#define GENBOOLCOMMENT(Prefix, V, Field) \
CommentOS << (Prefix) << ((V) & (TracebackTable::Field##Mask) ? "+" : "-") \
<< #Field
#define GENVALUECOMMENT(PrefixAndName, V, Field) \
CommentOS << (PrefixAndName) << " = " \
<< static_cast<unsigned>(((V) & (TracebackTable::Field##Mask)) >> \
(TracebackTable::Field##Shift))
GENBOOLCOMMENT("", FirstHalfOfMandatoryField, IsGlobaLinkage);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsOutOfLineEpilogOrPrologue);
EmitComment();
GENBOOLCOMMENT("", FirstHalfOfMandatoryField, HasTraceBackTableOffset);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsInternalProcedure);
EmitComment();
GENBOOLCOMMENT("", FirstHalfOfMandatoryField, HasControlledStorage);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsTOCless);
EmitComment();
GENBOOLCOMMENT("", FirstHalfOfMandatoryField, IsFloatingPointPresent);
EmitComment();
GENBOOLCOMMENT("", FirstHalfOfMandatoryField,
IsFloatingPointOperationLogOrAbortEnabled);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(
(FirstHalfOfMandatoryField & 0x0000ff00) >> 8, 1);
// Set the 4th byte of the mandatory field.
FirstHalfOfMandatoryField |= TracebackTable::IsFunctionNamePresentMask;
static_assert(XCOFF::AllocRegNo == 31, "Unexpected register usage!");
if (MRI.isPhysRegUsed(Subtarget->isPPC64() ? PPC::X31 : PPC::R31,
/* SkipRegMaskTest */ true))
FirstHalfOfMandatoryField |= TracebackTable::IsAllocaUsedMask;
const SmallVectorImpl<Register> &MustSaveCRs = FI->getMustSaveCRs();
if (!MustSaveCRs.empty())
FirstHalfOfMandatoryField |= TracebackTable::IsCRSavedMask;
if (FI->mustSaveLR())
FirstHalfOfMandatoryField |= TracebackTable::IsLRSavedMask;
GENBOOLCOMMENT("", FirstHalfOfMandatoryField, IsInterruptHandler);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsFunctionNamePresent);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsAllocaUsed);
EmitComment();
GENVALUECOMMENT("OnConditionDirective", FirstHalfOfMandatoryField,
OnConditionDirective);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsCRSaved);
GENBOOLCOMMENT(", ", FirstHalfOfMandatoryField, IsLRSaved);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding((FirstHalfOfMandatoryField & 0xff),
1);
// Set the 5th byte of mandatory field.
uint32_t SecondHalfOfMandatoryField = 0;
// Always store back chain.
SecondHalfOfMandatoryField |= TracebackTable::IsBackChainStoredMask;
uint32_t FPRSaved = 0;
for (unsigned Reg = PPC::F14; Reg <= PPC::F31; ++Reg) {
if (MRI.isPhysRegModified(Reg)) {
FPRSaved = PPC::F31 - Reg + 1;
break;
}
}
SecondHalfOfMandatoryField |= (FPRSaved << TracebackTable::FPRSavedShift) &
TracebackTable::FPRSavedMask;
GENBOOLCOMMENT("", SecondHalfOfMandatoryField, IsBackChainStored);
GENBOOLCOMMENT(", ", SecondHalfOfMandatoryField, IsFixup);
GENVALUECOMMENT(", NumOfFPRsSaved", SecondHalfOfMandatoryField, FPRSaved);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(
(SecondHalfOfMandatoryField & 0xff000000) >> 24, 1);
// Set the 6th byte of mandatory field.
// Check whether has Vector Instruction,We only treat instructions uses vector
// register as vector instructions.
bool HasVectorInst = false;
for (unsigned Reg = PPC::V0; Reg <= PPC::V31; ++Reg)
if (MRI.isPhysRegUsed(Reg, /* SkipRegMaskTest */ true)) {
// Has VMX instruction.
HasVectorInst = true;
break;
}
if (FI->hasVectorParms() || HasVectorInst)
SecondHalfOfMandatoryField |= TracebackTable::HasVectorInfoMask;
uint16_t NumOfVRSaved = getNumberOfVRSaved();
bool ShouldEmitEHBlock =
TargetLoweringObjectFileXCOFF::ShouldEmitEHBlock(MF) || NumOfVRSaved > 0;
if (ShouldEmitEHBlock)
SecondHalfOfMandatoryField |= TracebackTable::HasExtensionTableMask;
uint32_t GPRSaved = 0;
// X13 is reserved under 64-bit environment.
unsigned GPRBegin = Subtarget->isPPC64() ? PPC::X14 : PPC::R13;
unsigned GPREnd = Subtarget->isPPC64() ? PPC::X31 : PPC::R31;
for (unsigned Reg = GPRBegin; Reg <= GPREnd; ++Reg) {
if (MRI.isPhysRegModified(Reg)) {
GPRSaved = GPREnd - Reg + 1;
break;
}
}
SecondHalfOfMandatoryField |= (GPRSaved << TracebackTable::GPRSavedShift) &
TracebackTable::GPRSavedMask;
GENBOOLCOMMENT("", SecondHalfOfMandatoryField, HasExtensionTable);
GENBOOLCOMMENT(", ", SecondHalfOfMandatoryField, HasVectorInfo);
GENVALUECOMMENT(", NumOfGPRsSaved", SecondHalfOfMandatoryField, GPRSaved);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(
(SecondHalfOfMandatoryField & 0x00ff0000) >> 16, 1);
// Set the 7th byte of mandatory field.
uint32_t NumberOfFixedParms = FI->getFixedParmsNum();
SecondHalfOfMandatoryField |=
(NumberOfFixedParms << TracebackTable::NumberOfFixedParmsShift) &
TracebackTable::NumberOfFixedParmsMask;
GENVALUECOMMENT("NumberOfFixedParms", SecondHalfOfMandatoryField,
NumberOfFixedParms);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(
(SecondHalfOfMandatoryField & 0x0000ff00) >> 8, 1);
// Set the 8th byte of mandatory field.
// Always set parameter on stack.
SecondHalfOfMandatoryField |= TracebackTable::HasParmsOnStackMask;
uint32_t NumberOfFPParms = FI->getFloatingPointParmsNum();
SecondHalfOfMandatoryField |=
(NumberOfFPParms << TracebackTable::NumberOfFloatingPointParmsShift) &
TracebackTable::NumberOfFloatingPointParmsMask;
GENVALUECOMMENT("NumberOfFPParms", SecondHalfOfMandatoryField,
NumberOfFloatingPointParms);
GENBOOLCOMMENT(", ", SecondHalfOfMandatoryField, HasParmsOnStack);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(SecondHalfOfMandatoryField & 0xff,
1);
// Generate the optional fields of traceback table.
// Parameter type.
if (NumberOfFixedParms || NumberOfFPParms) {
uint32_t ParmsTypeValue = FI->getParmsType();
Expected<SmallString<32>> ParmsType =
FI->hasVectorParms()
? XCOFF::parseParmsTypeWithVecInfo(
ParmsTypeValue, NumberOfFixedParms, NumberOfFPParms,
FI->getVectorParmsNum())
: XCOFF::parseParmsType(ParmsTypeValue, NumberOfFixedParms,
NumberOfFPParms);
assert(ParmsType && toString(ParmsType.takeError()).c_str());
if (ParmsType) {
CommentOS << "Parameter type = " << ParmsType.get();
EmitComment();
}
OutStreamer->emitIntValueInHexWithPadding(ParmsTypeValue,
sizeof(ParmsTypeValue));
}
// Traceback table offset.
OutStreamer->AddComment("Function size");
if (FirstHalfOfMandatoryField & TracebackTable::HasTraceBackTableOffsetMask) {
MCSymbol *FuncSectSym = getObjFileLowering().getFunctionEntryPointSymbol(
&(MF->getFunction()), TM);
OutStreamer->emitAbsoluteSymbolDiff(FuncEnd, FuncSectSym, 4);
}
// Since we unset the Int_Handler.
if (FirstHalfOfMandatoryField & TracebackTable::IsInterruptHandlerMask)
report_fatal_error("Hand_Mask not implement yet");
if (FirstHalfOfMandatoryField & TracebackTable::HasControlledStorageMask)
report_fatal_error("Ctl_Info not implement yet");
if (FirstHalfOfMandatoryField & TracebackTable::IsFunctionNamePresentMask) {
StringRef Name = MF->getName().substr(0, INT16_MAX);
int16_t NameLength = Name.size();
CommentOS << "Function name len = "
<< static_cast<unsigned int>(NameLength);
EmitCommentAndValue(NameLength, 2);
OutStreamer->AddComment("Function Name");
OutStreamer->emitBytes(Name);
}
if (FirstHalfOfMandatoryField & TracebackTable::IsAllocaUsedMask) {
uint8_t AllocReg = XCOFF::AllocRegNo;
OutStreamer->AddComment("AllocaUsed");
OutStreamer->emitIntValueInHex(AllocReg, sizeof(AllocReg));
}
if (SecondHalfOfMandatoryField & TracebackTable::HasVectorInfoMask) {
uint16_t VRData = 0;
if (NumOfVRSaved) {
// Number of VRs saved.
VRData |= (NumOfVRSaved << TracebackTable::NumberOfVRSavedShift) &
TracebackTable::NumberOfVRSavedMask;
// This bit is supposed to set only when the special register
// VRSAVE is saved on stack.
// However, IBM XL compiler sets the bit when any vector registers
// are saved on the stack. We will follow XL's behavior on AIX
// so that we don't get surprise behavior change for C code.
VRData |= TracebackTable::IsVRSavedOnStackMask;
}
// Set has_varargs.
if (FI->getVarArgsFrameIndex())
VRData |= TracebackTable::HasVarArgsMask;
// Vector parameters number.
unsigned VectorParmsNum = FI->getVectorParmsNum();
VRData |= (VectorParmsNum << TracebackTable::NumberOfVectorParmsShift) &
TracebackTable::NumberOfVectorParmsMask;
if (HasVectorInst)
VRData |= TracebackTable::HasVMXInstructionMask;
GENVALUECOMMENT("NumOfVRsSaved", VRData, NumberOfVRSaved);
GENBOOLCOMMENT(", ", VRData, IsVRSavedOnStack);
GENBOOLCOMMENT(", ", VRData, HasVarArgs);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding((VRData & 0xff00) >> 8, 1);
GENVALUECOMMENT("NumOfVectorParams", VRData, NumberOfVectorParms);
GENBOOLCOMMENT(", ", VRData, HasVMXInstruction);
EmitComment();
OutStreamer->emitIntValueInHexWithPadding(VRData & 0x00ff, 1);
uint32_t VecParmTypeValue = FI->getVecExtParmsType();
Expected<SmallString<32>> VecParmsType =
XCOFF::parseVectorParmsType(VecParmTypeValue, VectorParmsNum);
assert(VecParmsType && toString(VecParmsType.takeError()).c_str());
if (VecParmsType) {
CommentOS << "Vector Parameter type = " << VecParmsType.get();
EmitComment();
}
OutStreamer->emitIntValueInHexWithPadding(VecParmTypeValue,
sizeof(VecParmTypeValue));
// Padding 2 bytes.
CommentOS << "Padding";
EmitCommentAndValue(0, 2);
}
uint8_t ExtensionTableFlag = 0;
if (SecondHalfOfMandatoryField & TracebackTable::HasExtensionTableMask) {
if (ShouldEmitEHBlock)
ExtensionTableFlag |= ExtendedTBTableFlag::TB_EH_INFO;
if (EnableSSPCanaryBitInTB &&
TargetLoweringObjectFileXCOFF::ShouldSetSSPCanaryBitInTB(MF))
ExtensionTableFlag |= ExtendedTBTableFlag::TB_SSP_CANARY;
CommentOS << "ExtensionTableFlag = "
<< getExtendedTBTableFlagString(ExtensionTableFlag);
EmitCommentAndValue(ExtensionTableFlag, sizeof(ExtensionTableFlag));
}
if (ExtensionTableFlag & ExtendedTBTableFlag::TB_EH_INFO) {
auto &Ctx = OutStreamer->getContext();
MCSymbol *EHInfoSym =
TargetLoweringObjectFileXCOFF::getEHInfoTableSymbol(MF);
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(EHInfoSym);
const MCSymbol *TOCBaseSym =
cast<MCSectionXCOFF>(getObjFileLowering().getTOCBaseSection())
->getQualNameSymbol();
const MCExpr *Exp =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCEntry, Ctx),
MCSymbolRefExpr::create(TOCBaseSym, Ctx), Ctx);
const DataLayout &DL = getDataLayout();
OutStreamer->emitValueToAlignment(4);
OutStreamer->AddComment("EHInfo Table");
OutStreamer->emitValue(Exp, DL.getPointerSize());
}
#undef GENBOOLCOMMENT
#undef GENVALUECOMMENT
}
static bool isSpecialLLVMGlobalArrayToSkip(const GlobalVariable *GV) {
return GV->hasAppendingLinkage() &&
StringSwitch<bool>(GV->getName())
// TODO: Linker could still eliminate the GV if we just skip
// handling llvm.used array. Skipping them for now until we or the
// AIX OS team come up with a good solution.
.Case("llvm.used", true)
// It's correct to just skip llvm.compiler.used array here.
.Case("llvm.compiler.used", true)
.Default(false);
}
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) {
// Special LLVM global arrays have been handled at the initialization.
if (isSpecialLLVMGlobalArrayToSkip(GV) || isSpecialLLVMGlobalArrayForStaticInit(GV))
return;
// If the Global Variable has the toc-data attribute, it needs to be emitted
// when we emit the .toc section.
if (GV->hasAttribute("toc-data")) {
TOCDataGlobalVars.push_back(GV);
return;
}
emitGlobalVariableHelper(GV);
}
void PPCAIXAsmPrinter::emitGlobalVariableHelper(const GlobalVariable *GV) {
assert(!GV->getName().startswith("llvm.") &&
"Unhandled intrinsic global variable.");
if (GV->hasComdat())
report_fatal_error("COMDAT not yet supported by AIX.");
MCSymbolXCOFF *GVSym = cast<MCSymbolXCOFF>(getSymbol(GV));
if (GV->isDeclarationForLinker()) {
emitLinkage(GV, GVSym);
return;
}
SectionKind GVKind = getObjFileLowering().getKindForGlobal(GV, TM);
if (!GVKind.isGlobalWriteableData() && !GVKind.isReadOnly() &&
!GVKind.isThreadLocal()) // Checks for both ThreadData and ThreadBSS.
report_fatal_error("Encountered a global variable kind that is "
"not supported yet.");
// Print GV in verbose mode
if (isVerbose()) {
if (GV->hasInitializer()) {
GV->printAsOperand(OutStreamer->GetCommentOS(),
/*PrintType=*/false, GV->getParent());
OutStreamer->GetCommentOS() << '\n';
}
}
MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
getObjFileLowering().SectionForGlobal(GV, GVKind, TM));
// Switch to the containing csect.
OutStreamer->SwitchSection(Csect);
const DataLayout &DL = GV->getParent()->getDataLayout();
// Handle common and zero-initialized local symbols.
if (GV->hasCommonLinkage() || GVKind.isBSSLocal() ||
GVKind.isThreadBSSLocal()) {
Align Alignment = GV->getAlign().getValueOr(DL.getPreferredAlign(GV));
uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
GVSym->setStorageClass(
TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GV));
if (GVKind.isBSSLocal() || GVKind.isThreadBSSLocal())
OutStreamer->emitXCOFFLocalCommonSymbol(
OutContext.getOrCreateSymbol(GVSym->getSymbolTableName()), Size,
GVSym, Alignment.value());
else
OutStreamer->emitCommonSymbol(GVSym, Size, Alignment.value());
return;
}
MCSymbol *EmittedInitSym = GVSym;
emitLinkage(GV, EmittedInitSym);
emitAlignment(getGVAlignment(GV, DL), GV);
// When -fdata-sections is enabled, every GlobalVariable will
// be put into its own csect; therefore, label is not necessary here.
if (!TM.getDataSections() || GV->hasSection()) {
OutStreamer->emitLabel(EmittedInitSym);
}
// Emit aliasing label for global variable.
llvm::for_each(GOAliasMap[GV], [this](const GlobalAlias *Alias) {
OutStreamer->emitLabel(getSymbol(Alias));
});
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 aliasing label for function descriptor csect.
llvm::for_each(GOAliasMap[&MF->getFunction()],
[this](const GlobalAlias *Alias) {
OutStreamer->emitLabel(getSymbol(Alias));
});
// 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::emitFunctionEntryLabel() {
// It's not necessary to emit the label when we have individual
// function in its own csect.
if (!TM.getFunctionSections())
PPCAsmPrinter::emitFunctionEntryLabel();
// Emit aliasing label for function entry point label.
llvm::for_each(
GOAliasMap[&MF->getFunction()], [this](const GlobalAlias *Alias) {
OutStreamer->emitLabel(
getObjFileLowering().getFunctionEntryPointSymbol(Alias, TM));
});
}
void PPCAIXAsmPrinter::emitEndOfAsmFile(Module &M) {
// If there are no functions and there are no toc-data definitions in this
// module, we will never need to reference the TOC base.
if (M.empty() && TOCDataGlobalVars.empty())
return;
// Switch to section to emit TOC base.
OutStreamer->SwitchSection(getObjFileLowering().getTOCBaseSection());
PPCTargetStreamer *TS =
static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
for (auto &I : TOC) {
MCSectionXCOFF *TCEntry;
// Setup the csect for the current TC entry. If the variant kind is
// VK_PPC_AIX_TLSGDM the entry represents the region handle, we create a
// new symbol to prefix the name with a dot.
if (I.first.second == MCSymbolRefExpr::VariantKind::VK_PPC_AIX_TLSGDM) {
SmallString<128> Name;
StringRef Prefix = ".";
Name += Prefix;
Name += I.first.first->getName();
MCSymbol *S = OutContext.getOrCreateSymbol(Name);
TCEntry = cast<MCSectionXCOFF>(
getObjFileLowering().getSectionForTOCEntry(S, TM));
} else {
TCEntry = cast<MCSectionXCOFF>(
getObjFileLowering().getSectionForTOCEntry(I.first.first, TM));
}
OutStreamer->SwitchSection(TCEntry);
OutStreamer->emitLabel(I.second);
if (TS != nullptr)
TS->emitTCEntry(*I.first.first, I.first.second);
}
for (const auto *GV : TOCDataGlobalVars)
emitGlobalVariableHelper(GV);
}
bool PPCAIXAsmPrinter::doInitialization(Module &M) {
const bool Result = PPCAsmPrinter::doInitialization(M);
auto setCsectAlignment = [this](const GlobalObject *GO) {
// Declarations have 0 alignment which is set by default.
if (GO->isDeclarationForLinker())
return;
SectionKind GOKind = getObjFileLowering().getKindForGlobal(GO, TM);
MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
getObjFileLowering().SectionForGlobal(GO, GOKind, TM));
Align GOAlign = getGVAlignment(GO, GO->getParent()->getDataLayout());
if (GOAlign > Csect->getAlignment())
Csect->setAlignment(GOAlign);
};
// We need to know, up front, the alignment of csects for the assembly path,
// because once a .csect directive gets emitted, we could not change the
// alignment value on it.
for (const auto &G : M.globals()) {
if (isSpecialLLVMGlobalArrayToSkip(&G))
continue;
if (isSpecialLLVMGlobalArrayForStaticInit(&G)) {
// Generate a format indicator and a unique module id to be a part of
// the sinit and sterm function names.
if (FormatIndicatorAndUniqueModId.empty()) {
std::string UniqueModuleId = getUniqueModuleId(&M);
if (UniqueModuleId != "")
// TODO: Use source file full path to generate the unique module id
// and add a format indicator as a part of function name in case we
// will support more than one format.
FormatIndicatorAndUniqueModId = "clang_" + UniqueModuleId.substr(1);
else
// Use the Pid and current time as the unique module id when we cannot
// generate one based on a module's strong external symbols.
// FIXME: Adjust the comment accordingly after we use source file full
// path instead.
FormatIndicatorAndUniqueModId =
"clangPidTime_" + llvm::itostr(sys::Process::getProcessId()) +
"_" + llvm::itostr(time(nullptr));
}
emitSpecialLLVMGlobal(&G);
continue;
}
setCsectAlignment(&G);
}
for (const auto &F : M)
setCsectAlignment(&F);
// Construct an aliasing list for each GlobalObject.
for (const auto &Alias : M.aliases()) {
const GlobalObject *Base = Alias.getBaseObject();
if (!Base)
report_fatal_error(
"alias without a base object is not yet supported on AIX");
GOAliasMap[Base].push_back(&Alias);
}
return Result;
}
void PPCAIXAsmPrinter::emitInstruction(const MachineInstr *MI) {
switch (MI->getOpcode()) {
default:
break;
case PPC::GETtlsADDR64AIX:
case PPC::GETtlsADDR32AIX: {
// The reference to .__tls_get_addr is unknown to the assembler
// so we need to emit an external symbol reference.
MCSymbol *TlsGetAddr = createMCSymbolForTlsGetAddr(OutContext);
ExtSymSDNodeSymbols.insert(TlsGetAddr);
break;
}
case PPC::BL8:
case PPC::BL:
case PPC::BL8_NOP:
case PPC::BL_NOP: {
const MachineOperand &MO = MI->getOperand(0);
if (MO.isSymbol()) {
MCSymbolXCOFF *S =
cast<MCSymbolXCOFF>(OutContext.getOrCreateSymbol(MO.getSymbolName()));
ExtSymSDNodeSymbols.insert(S);
}
} break;
case PPC::BL_TLS:
case PPC::BL8_TLS:
case PPC::BL8_TLS_:
case PPC::BL8_NOP_TLS:
report_fatal_error("TLS call not yet implemented");
case PPC::TAILB:
case PPC::TAILB8:
case PPC::TAILBA:
case PPC::TAILBA8:
case PPC::TAILBCTR:
case PPC::TAILBCTR8:
if (MI->getOperand(0).isSymbol())
report_fatal_error("Tail call for extern symbol not yet supported.");
break;
case PPC::DST:
case PPC::DST64:
case PPC::DSTT:
case PPC::DSTT64:
case PPC::DSTST:
case PPC::DSTST64:
case PPC::DSTSTT:
case PPC::DSTSTT64:
EmitToStreamer(
*OutStreamer,
MCInstBuilder(PPC::ORI).addReg(PPC::R0).addReg(PPC::R0).addImm(0));
return;
}
return PPCAsmPrinter::emitInstruction(MI);
}
bool PPCAIXAsmPrinter::doFinalization(Module &M) {
// Do streamer related finalization for DWARF.
if (!MAI->usesDwarfFileAndLocDirectives() && MMI->hasDebugInfo())
OutStreamer->doFinalizationAtSectionEnd(
OutStreamer->getContext().getObjectFileInfo()->getTextSection());
for (MCSymbol *Sym : ExtSymSDNodeSymbols)
OutStreamer->emitSymbolAttribute(Sym, MCSA_Extern);
return PPCAsmPrinter::doFinalization(M);
}
static unsigned mapToSinitPriority(int P) {
if (P < 0 || P > 65535)
report_fatal_error("invalid init priority");
if (P <= 20)
return P;
if (P < 81)
return 20 + (P - 20) * 16;
if (P <= 1124)
return 1004 + (P - 81);
if (P < 64512)
return 2047 + (P - 1124) * 33878;
return 2147482625u + (P - 64512);
}
static std::string convertToSinitPriority(int Priority) {
// This helper function converts clang init priority to values used in sinit
// and sterm functions.
//
// The conversion strategies are:
// We map the reserved clang/gnu priority range [0, 100] into the sinit/sterm
// reserved priority range [0, 1023] by
// - directly mapping the first 21 and the last 20 elements of the ranges
// - linear interpolating the intermediate values with a step size of 16.
//
// We map the non reserved clang/gnu priority range of [101, 65535] into the
// sinit/sterm priority range [1024, 2147483648] by:
// - directly mapping the first and the last 1024 elements of the ranges
// - linear interpolating the intermediate values with a step size of 33878.
unsigned int P = mapToSinitPriority(Priority);
std::string PrioritySuffix;
llvm::raw_string_ostream os(PrioritySuffix);
os << llvm::format_hex_no_prefix(P, 8);
os.flush();
return PrioritySuffix;
}
void PPCAIXAsmPrinter::emitXXStructorList(const DataLayout &DL,
const Constant *List, bool IsCtor) {
SmallVector<Structor, 8> Structors;
preprocessXXStructorList(DL, List, Structors);
if (Structors.empty())
return;
unsigned Index = 0;
for (Structor &S : Structors) {
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(S.Func))
S.Func = CE->getOperand(0);
llvm::GlobalAlias::create(
GlobalValue::ExternalLinkage,
(IsCtor ? llvm::Twine("__sinit") : llvm::Twine("__sterm")) +
llvm::Twine(convertToSinitPriority(S.Priority)) +
llvm::Twine("_", FormatIndicatorAndUniqueModId) +
llvm::Twine("_", llvm::utostr(Index++)),
cast<Function>(S.Func));
}
}
void PPCAIXAsmPrinter::emitTTypeReference(const GlobalValue *GV,
unsigned Encoding) {
if (GV) {
MCSymbol *TypeInfoSym = TM.getSymbol(GV);
MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(TypeInfoSym);
const MCSymbol *TOCBaseSym =
cast<MCSectionXCOFF>(getObjFileLowering().getTOCBaseSection())
->getQualNameSymbol();
auto &Ctx = OutStreamer->getContext();
const MCExpr *Exp =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCEntry, Ctx),
MCSymbolRefExpr::create(TOCBaseSym, Ctx), Ctx);
OutStreamer->emitValue(Exp, GetSizeOfEncodedValue(Encoding));
} else
OutStreamer->emitIntValue(0, GetSizeOfEncodedValue(Encoding));
}
// Return a pass that prints the PPC assembly code for a MachineFunction to the
// given output stream.
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(getThePPC32LETarget(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64Target(),
createPPCAsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getThePPC64LETarget(),
createPPCAsmPrinterPass);
}
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