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//===-- SparcMCCodeEmitter.cpp - Convert Sparc code to machine code -------===//
//
// 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 implements the SparcMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/SparcFixupKinds.h"
#include "SparcMCExpr.h"
#include "SparcMCTargetDesc.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
#define DEBUG_TYPE "mccodeemitter"
STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
namespace {
class SparcMCCodeEmitter : public MCCodeEmitter {
const MCInstrInfo &MCII;
MCContext &Ctx;
public:
SparcMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx)
: MCII(mcii), Ctx(ctx) {}
SparcMCCodeEmitter(const SparcMCCodeEmitter &) = delete;
SparcMCCodeEmitter &operator=(const SparcMCCodeEmitter &) = delete;
~SparcMCCodeEmitter() override = default;
void encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const override;
// getBinaryCodeForInstr - TableGen'erated function for getting the
// binary encoding for an instruction.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
private:
FeatureBitset computeAvailableFeatures(const FeatureBitset &FB) const;
void
verifyInstructionPredicates(const MCInst &MI,
const FeatureBitset &AvailableFeatures) const;
};
} // end anonymous namespace
void SparcMCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
verifyInstructionPredicates(MI,
computeAvailableFeatures(STI.getFeatureBits()));
unsigned Bits = getBinaryCodeForInstr(MI, Fixups, STI);
support::endian::write(OS, Bits,
Ctx.getAsmInfo()->isLittleEndian() ? support::little
: support::big);
unsigned tlsOpNo = 0;
switch (MI.getOpcode()) {
default: break;
case SP::TLS_CALL: tlsOpNo = 1; break;
case SP::TLS_ADDrr:
case SP::TLS_ADDXrr:
case SP::TLS_LDrr:
case SP::TLS_LDXrr: tlsOpNo = 3; break;
}
if (tlsOpNo != 0) {
const MCOperand &MO = MI.getOperand(tlsOpNo);
uint64_t op = getMachineOpValue(MI, MO, Fixups, STI);
assert(op == 0 && "Unexpected operand value!");
(void)op; // suppress warning.
}
++MCNumEmitted; // Keep track of the # of mi's emitted.
}
unsigned SparcMCCodeEmitter::
getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
if (MO.isReg())
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm())
return MO.getImm();
assert(MO.isExpr());
const MCExpr *Expr = MO.getExpr();
if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr)) {
MCFixupKind Kind = (MCFixupKind)SExpr->getFixupKind();
Fixups.push_back(MCFixup::create(0, Expr, Kind));
return 0;
}
int64_t Res;
if (Expr->evaluateAsAbsolute(Res))
return Res;
llvm_unreachable("Unhandled expression!");
return 0;
}
unsigned SparcMCCodeEmitter::
getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups, STI);
if (MI.getOpcode() == SP::TLS_CALL) {
// No fixups for __tls_get_addr. Will emit for fixups for tls_symbol in
// encodeInstruction.
#ifndef NDEBUG
// Verify that the callee is actually __tls_get_addr.
const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(MO.getExpr());
assert(SExpr && SExpr->getSubExpr()->getKind() == MCExpr::SymbolRef &&
"Unexpected expression in TLS_CALL");
const MCSymbolRefExpr *SymExpr = cast<MCSymbolRefExpr>(SExpr->getSubExpr());
assert(SymExpr->getSymbol().getName() == "__tls_get_addr" &&
"Unexpected function for TLS_CALL");
#endif
return 0;
}
MCFixupKind fixupKind = (MCFixupKind)Sparc::fixup_sparc_call30;
if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(MO.getExpr())) {
if (SExpr->getKind() == SparcMCExpr::VK_Sparc_WPLT30)
fixupKind = (MCFixupKind)Sparc::fixup_sparc_wplt30;
}
Fixups.push_back(MCFixup::create(0, MO.getExpr(), fixupKind));
return 0;
}
unsigned SparcMCCodeEmitter::
getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups, STI);
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
(MCFixupKind)Sparc::fixup_sparc_br22));
return 0;
}
unsigned SparcMCCodeEmitter::
getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups, STI);
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
(MCFixupKind)Sparc::fixup_sparc_br19));
return 0;
}
unsigned SparcMCCodeEmitter::
getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups, STI);
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
(MCFixupKind)Sparc::fixup_sparc_br16_2));
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
(MCFixupKind)Sparc::fixup_sparc_br16_14));
return 0;
}
#define ENABLE_INSTR_PREDICATE_VERIFIER
#include "SparcGenMCCodeEmitter.inc"
MCCodeEmitter *llvm::createSparcMCCodeEmitter(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
MCContext &Ctx) {
return new SparcMCCodeEmitter(MCII, Ctx);
}
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