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llvm-mirror/lib/Target/Sparc/SparcAsmPrinter.cpp
LemonBoy 9446cdc809 [SPARC] Recognize and handle the %lm(sym) operator 
Reviewed By: joerg

Differential Revision: https://reviews.llvm.org/D77737
2021-02-08 19:25:33 -05:00

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//===-- SparcAsmPrinter.cpp - Sparc LLVM assembly writer ------------------===//
//
// 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 GAS-format SPARC assembly language.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/SparcInstPrinter.h"
#include "MCTargetDesc/SparcMCExpr.h"
#include "MCTargetDesc/SparcTargetStreamer.h"
#include "Sparc.h"
#include "SparcInstrInfo.h"
#include "SparcTargetMachine.h"
#include "TargetInfo/SparcTargetInfo.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
namespace {
class SparcAsmPrinter : public AsmPrinter {
SparcTargetStreamer &getTargetStreamer() {
return static_cast<SparcTargetStreamer &>(
*OutStreamer->getTargetStreamer());
}
public:
explicit SparcAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)) {}
StringRef getPassName() const override { return "Sparc Assembly Printer"; }
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
const char *Modifier = nullptr);
void emitFunctionBodyStart() override;
void emitInstruction(const MachineInstr *MI) override;
static const char *getRegisterName(unsigned RegNo) {
return SparcInstPrinter::getRegisterName(RegNo);
}
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 LowerGETPCXAndEmitMCInsts(const MachineInstr *MI,
const MCSubtargetInfo &STI);
};
} // end of anonymous namespace
static MCOperand createSparcMCOperand(SparcMCExpr::VariantKind Kind,
MCSymbol *Sym, MCContext &OutContext) {
const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Sym,
OutContext);
const SparcMCExpr *expr = SparcMCExpr::create(Kind, MCSym, OutContext);
return MCOperand::createExpr(expr);
}
static MCOperand createPCXCallOP(MCSymbol *Label,
MCContext &OutContext) {
return createSparcMCOperand(SparcMCExpr::VK_Sparc_WDISP30, Label, OutContext);
}
static MCOperand createPCXRelExprOp(SparcMCExpr::VariantKind Kind,
MCSymbol *GOTLabel, MCSymbol *StartLabel,
MCSymbol *CurLabel,
MCContext &OutContext)
{
const MCSymbolRefExpr *GOT = MCSymbolRefExpr::create(GOTLabel, OutContext);
const MCSymbolRefExpr *Start = MCSymbolRefExpr::create(StartLabel,
OutContext);
const MCSymbolRefExpr *Cur = MCSymbolRefExpr::create(CurLabel,
OutContext);
const MCBinaryExpr *Sub = MCBinaryExpr::createSub(Cur, Start, OutContext);
const MCBinaryExpr *Add = MCBinaryExpr::createAdd(GOT, Sub, OutContext);
const SparcMCExpr *expr = SparcMCExpr::create(Kind,
Add, OutContext);
return MCOperand::createExpr(expr);
}
static void EmitCall(MCStreamer &OutStreamer,
MCOperand &Callee,
const MCSubtargetInfo &STI)
{
MCInst CallInst;
CallInst.setOpcode(SP::CALL);
CallInst.addOperand(Callee);
OutStreamer.emitInstruction(CallInst, STI);
}
static void EmitSETHI(MCStreamer &OutStreamer,
MCOperand &Imm, MCOperand &RD,
const MCSubtargetInfo &STI)
{
MCInst SETHIInst;
SETHIInst.setOpcode(SP::SETHIi);
SETHIInst.addOperand(RD);
SETHIInst.addOperand(Imm);
OutStreamer.emitInstruction(SETHIInst, STI);
}
static void EmitBinary(MCStreamer &OutStreamer, unsigned Opcode,
MCOperand &RS1, MCOperand &Src2, MCOperand &RD,
const MCSubtargetInfo &STI)
{
MCInst Inst;
Inst.setOpcode(Opcode);
Inst.addOperand(RD);
Inst.addOperand(RS1);
Inst.addOperand(Src2);
OutStreamer.emitInstruction(Inst, STI);
}
static void EmitOR(MCStreamer &OutStreamer,
MCOperand &RS1, MCOperand &Imm, MCOperand &RD,
const MCSubtargetInfo &STI) {
EmitBinary(OutStreamer, SP::ORri, RS1, Imm, RD, STI);
}
static void EmitADD(MCStreamer &OutStreamer,
MCOperand &RS1, MCOperand &RS2, MCOperand &RD,
const MCSubtargetInfo &STI) {
EmitBinary(OutStreamer, SP::ADDrr, RS1, RS2, RD, STI);
}
static void EmitSHL(MCStreamer &OutStreamer,
MCOperand &RS1, MCOperand &Imm, MCOperand &RD,
const MCSubtargetInfo &STI) {
EmitBinary(OutStreamer, SP::SLLri, RS1, Imm, RD, STI);
}
static void EmitHiLo(MCStreamer &OutStreamer, MCSymbol *GOTSym,
SparcMCExpr::VariantKind HiKind,
SparcMCExpr::VariantKind LoKind,
MCOperand &RD,
MCContext &OutContext,
const MCSubtargetInfo &STI) {
MCOperand hi = createSparcMCOperand(HiKind, GOTSym, OutContext);
MCOperand lo = createSparcMCOperand(LoKind, GOTSym, OutContext);
EmitSETHI(OutStreamer, hi, RD, STI);
EmitOR(OutStreamer, RD, lo, RD, STI);
}
void SparcAsmPrinter::LowerGETPCXAndEmitMCInsts(const MachineInstr *MI,
const MCSubtargetInfo &STI)
{
MCSymbol *GOTLabel =
OutContext.getOrCreateSymbol(Twine("_GLOBAL_OFFSET_TABLE_"));
const MachineOperand &MO = MI->getOperand(0);
assert(MO.getReg() != SP::O7 &&
"%o7 is assigned as destination for getpcx!");
MCOperand MCRegOP = MCOperand::createReg(MO.getReg());
if (!isPositionIndependent()) {
// Just load the address of GOT to MCRegOP.
switch(TM.getCodeModel()) {
default:
llvm_unreachable("Unsupported absolute code model");
case CodeModel::Small:
EmitHiLo(*OutStreamer, GOTLabel,
SparcMCExpr::VK_Sparc_HI, SparcMCExpr::VK_Sparc_LO,
MCRegOP, OutContext, STI);
break;
case CodeModel::Medium: {
EmitHiLo(*OutStreamer, GOTLabel,
SparcMCExpr::VK_Sparc_H44, SparcMCExpr::VK_Sparc_M44,
MCRegOP, OutContext, STI);
MCOperand imm = MCOperand::createExpr(MCConstantExpr::create(12,
OutContext));
EmitSHL(*OutStreamer, MCRegOP, imm, MCRegOP, STI);
MCOperand lo = createSparcMCOperand(SparcMCExpr::VK_Sparc_L44,
GOTLabel, OutContext);
EmitOR(*OutStreamer, MCRegOP, lo, MCRegOP, STI);
break;
}
case CodeModel::Large: {
EmitHiLo(*OutStreamer, GOTLabel,
SparcMCExpr::VK_Sparc_HH, SparcMCExpr::VK_Sparc_HM,
MCRegOP, OutContext, STI);
MCOperand imm = MCOperand::createExpr(MCConstantExpr::create(32,
OutContext));
EmitSHL(*OutStreamer, MCRegOP, imm, MCRegOP, STI);
// Use register %o7 to load the lower 32 bits.
MCOperand RegO7 = MCOperand::createReg(SP::O7);
EmitHiLo(*OutStreamer, GOTLabel,
SparcMCExpr::VK_Sparc_HI, SparcMCExpr::VK_Sparc_LO,
RegO7, OutContext, STI);
EmitADD(*OutStreamer, MCRegOP, RegO7, MCRegOP, STI);
}
}
return;
}
MCSymbol *StartLabel = OutContext.createTempSymbol();
MCSymbol *EndLabel = OutContext.createTempSymbol();
MCSymbol *SethiLabel = OutContext.createTempSymbol();
MCOperand RegO7 = MCOperand::createReg(SP::O7);
// <StartLabel>:
// call <EndLabel>
// <SethiLabel>:
// sethi %hi(_GLOBAL_OFFSET_TABLE_+(<SethiLabel>-<StartLabel>)), <MO>
// <EndLabel>:
// or <MO>, %lo(_GLOBAL_OFFSET_TABLE_+(<EndLabel>-<StartLabel>))), <MO>
// add <MO>, %o7, <MO>
OutStreamer->emitLabel(StartLabel);
MCOperand Callee = createPCXCallOP(EndLabel, OutContext);
EmitCall(*OutStreamer, Callee, STI);
OutStreamer->emitLabel(SethiLabel);
MCOperand hiImm = createPCXRelExprOp(SparcMCExpr::VK_Sparc_PC22,
GOTLabel, StartLabel, SethiLabel,
OutContext);
EmitSETHI(*OutStreamer, hiImm, MCRegOP, STI);
OutStreamer->emitLabel(EndLabel);
MCOperand loImm = createPCXRelExprOp(SparcMCExpr::VK_Sparc_PC10,
GOTLabel, StartLabel, EndLabel,
OutContext);
EmitOR(*OutStreamer, MCRegOP, loImm, MCRegOP, STI);
EmitADD(*OutStreamer, MCRegOP, RegO7, MCRegOP, STI);
}
void SparcAsmPrinter::emitInstruction(const MachineInstr *MI) {
switch (MI->getOpcode()) {
default: break;
case TargetOpcode::DBG_VALUE:
// FIXME: Debug Value.
return;
case SP::GETPCX:
LowerGETPCXAndEmitMCInsts(MI, getSubtargetInfo());
return;
}
MachineBasicBlock::const_instr_iterator I = MI->getIterator();
MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
do {
MCInst TmpInst;
LowerSparcMachineInstrToMCInst(&*I, TmpInst, *this);
EmitToStreamer(*OutStreamer, TmpInst);
} while ((++I != E) && I->isInsideBundle()); // Delay slot check.
}
void SparcAsmPrinter::emitFunctionBodyStart() {
if (!MF->getSubtarget<SparcSubtarget>().is64Bit())
return;
const MachineRegisterInfo &MRI = MF->getRegInfo();
const unsigned globalRegs[] = { SP::G2, SP::G3, SP::G6, SP::G7, 0 };
for (unsigned i = 0; globalRegs[i] != 0; ++i) {
unsigned reg = globalRegs[i];
if (MRI.use_empty(reg))
continue;
if (reg == SP::G6 || reg == SP::G7)
getTargetStreamer().emitSparcRegisterIgnore(reg);
else
getTargetStreamer().emitSparcRegisterScratch(reg);
}
}
void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const DataLayout &DL = getDataLayout();
const MachineOperand &MO = MI->getOperand (opNum);
SparcMCExpr::VariantKind TF = (SparcMCExpr::VariantKind) MO.getTargetFlags();
#ifndef NDEBUG
// Verify the target flags.
if (MO.isGlobal() || MO.isSymbol() || MO.isCPI()) {
if (MI->getOpcode() == SP::CALL)
assert(TF == SparcMCExpr::VK_Sparc_None &&
"Cannot handle target flags on call address");
else if (MI->getOpcode() == SP::SETHIi || MI->getOpcode() == SP::SETHIXi)
assert((TF == SparcMCExpr::VK_Sparc_HI
|| TF == SparcMCExpr::VK_Sparc_H44
|| TF == SparcMCExpr::VK_Sparc_HH
|| TF == SparcMCExpr::VK_Sparc_LM
|| TF == SparcMCExpr::VK_Sparc_TLS_GD_HI22
|| TF == SparcMCExpr::VK_Sparc_TLS_LDM_HI22
|| TF == SparcMCExpr::VK_Sparc_TLS_LDO_HIX22
|| TF == SparcMCExpr::VK_Sparc_TLS_IE_HI22
|| TF == SparcMCExpr::VK_Sparc_TLS_LE_HIX22) &&
"Invalid target flags for address operand on sethi");
else if (MI->getOpcode() == SP::TLS_CALL)
assert((TF == SparcMCExpr::VK_Sparc_None
|| TF == SparcMCExpr::VK_Sparc_TLS_GD_CALL
|| TF == SparcMCExpr::VK_Sparc_TLS_LDM_CALL) &&
"Cannot handle target flags on tls call address");
else if (MI->getOpcode() == SP::TLS_ADDrr)
assert((TF == SparcMCExpr::VK_Sparc_TLS_GD_ADD
|| TF == SparcMCExpr::VK_Sparc_TLS_LDM_ADD
|| TF == SparcMCExpr::VK_Sparc_TLS_LDO_ADD
|| TF == SparcMCExpr::VK_Sparc_TLS_IE_ADD) &&
"Cannot handle target flags on add for TLS");
else if (MI->getOpcode() == SP::TLS_LDrr)
assert(TF == SparcMCExpr::VK_Sparc_TLS_IE_LD &&
"Cannot handle target flags on ld for TLS");
else if (MI->getOpcode() == SP::TLS_LDXrr)
assert(TF == SparcMCExpr::VK_Sparc_TLS_IE_LDX &&
"Cannot handle target flags on ldx for TLS");
else if (MI->getOpcode() == SP::XORri || MI->getOpcode() == SP::XORXri)
assert((TF == SparcMCExpr::VK_Sparc_TLS_LDO_LOX10
|| TF == SparcMCExpr::VK_Sparc_TLS_LE_LOX10) &&
"Cannot handle target flags on xor for TLS");
else
assert((TF == SparcMCExpr::VK_Sparc_LO
|| TF == SparcMCExpr::VK_Sparc_M44
|| TF == SparcMCExpr::VK_Sparc_L44
|| TF == SparcMCExpr::VK_Sparc_HM
|| TF == SparcMCExpr::VK_Sparc_TLS_GD_LO10
|| TF == SparcMCExpr::VK_Sparc_TLS_LDM_LO10
|| TF == SparcMCExpr::VK_Sparc_TLS_IE_LO10 ) &&
"Invalid target flags for small address operand");
}
#endif
bool CloseParen = SparcMCExpr::printVariantKind(O, TF);
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << "%" << StringRef(getRegisterName(MO.getReg())).lower();
break;
case MachineOperand::MO_Immediate:
O << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
MO.getMBB()->getSymbol()->print(O, MAI);
return;
case MachineOperand::MO_GlobalAddress:
PrintSymbolOperand(MO, O);
break;
case MachineOperand::MO_BlockAddress:
O << GetBlockAddressSymbol(MO.getBlockAddress())->getName();
break;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
<< MO.getIndex();
break;
case MachineOperand::MO_Metadata:
MO.getMetadata()->printAsOperand(O, MMI->getModule());
break;
default:
llvm_unreachable("<unknown operand type>");
}
if (CloseParen) O << ")";
}
void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
raw_ostream &O, const char *Modifier) {
printOperand(MI, opNum, O);
// If this is an ADD operand, emit it like normal operands.
if (Modifier && !strcmp(Modifier, "arith")) {
O << ", ";
printOperand(MI, opNum+1, O);
return;
}
if (MI->getOperand(opNum+1).isReg() &&
MI->getOperand(opNum+1).getReg() == SP::G0)
return; // don't print "+%g0"
if (MI->getOperand(opNum+1).isImm() &&
MI->getOperand(opNum+1).getImm() == 0)
return; // don't print "+0"
O << "+";
printOperand(MI, opNum+1, O);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool SparcAsmPrinter::PrintAsmOperand(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:
// See if this is a generic print operand
return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
case 'f':
case 'r':
break;
}
}
printOperand(MI, OpNo, O);
return false;
}
bool SparcAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier
O << '[';
printMemOperand(MI, OpNo, O);
O << ']';
return false;
}
// Force static initialization.
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcAsmPrinter() {
RegisterAsmPrinter<SparcAsmPrinter> X(getTheSparcTarget());
RegisterAsmPrinter<SparcAsmPrinter> Y(getTheSparcV9Target());
RegisterAsmPrinter<SparcAsmPrinter> Z(getTheSparcelTarget());
}
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