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llvm-project/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp

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//===-- SystemZMCCodeEmitter.cpp - Convert SystemZ code to machine code ---===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the SystemZMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/SystemZMCFixups.h"
#include "MCTargetDesc/SystemZMCTargetDesc.h"
#include "llvm/ADT/SmallVector.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/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
#define DEBUG_TYPE "mccodeemitter"
namespace {
class SystemZMCCodeEmitter : public MCCodeEmitter {
const MCInstrInfo &MCII;
MCContext &Ctx;
public:
SystemZMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx)
: MCII(mcii), Ctx(ctx) {
}
~SystemZMCCodeEmitter() override = default;
// OVerride MCCodeEmitter.
void encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const override;
private:
// Automatically generated by TableGen.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
// Called by the TableGen code to get the binary encoding of operand
// MO in MI. Fixups is the list of fixups against MI.
uint64_t getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
// Called by the TableGen code to get the binary encoding of an address.
// The index or length, if any, is encoded first, followed by the base,
// followed by the displacement. In a 20-bit displacement,
// the low 12 bits are encoded before the high 8 bits.
uint64_t getBDAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDAddr20Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDXAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDXAddr20Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDLAddr12Len8Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDRAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBDVAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
// Operand OpNum of MI needs a PC-relative fixup of kind Kind at
// Offset bytes from the start of MI. Add the fixup to Fixups
// and return the in-place addend, which since we're a RELA target
// is always 0. If AllowTLS is true and optional operand OpNum + 1
// is present, also emit a TLS call fixup for it.
uint64_t getPCRelEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
unsigned Kind, int64_t Offset,
bool AllowTLS) const;
uint64_t getPC16DBLEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC16DBL, 2, false);
}
uint64_t getPC32DBLEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC32DBL, 2, false);
}
uint64_t getPC16DBLTLSEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC16DBL, 2, true);
}
uint64_t getPC32DBLTLSEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC32DBL, 2, true);
}
uint64_t getPC12DBLBPPEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC12DBL, 1, false);
}
uint64_t getPC16DBLBPPEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC16DBL, 4, false);
}
uint64_t getPC24DBLBPPEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
return getPCRelEncoding(MI, OpNum, Fixups,
SystemZ::FK_390_PC24DBL, 3, false);
}
private:
uint64_t computeAvailableFeatures(const FeatureBitset &FB) const;
void verifyInstructionPredicates(const MCInst &MI,
uint64_t AvailableFeatures) const;
};
} // end anonymous namespace
void SystemZMCCodeEmitter::
encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
verifyInstructionPredicates(MI,
computeAvailableFeatures(STI.getFeatureBits()));
uint64_t Bits = getBinaryCodeForInstr(MI, Fixups, STI);
unsigned Size = MCII.get(MI.getOpcode()).getSize();
// Big-endian insertion of Size bytes.
unsigned ShiftValue = (Size * 8) - 8;
for (unsigned I = 0; I != Size; ++I) {
OS << uint8_t(Bits >> ShiftValue);
ShiftValue -= 8;
}
}
uint64_t SystemZMCCodeEmitter::
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 static_cast<uint64_t>(MO.getImm());
llvm_unreachable("Unexpected operand type!");
}
uint64_t SystemZMCCodeEmitter::
getBDAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
assert(isUInt<4>(Base) && isUInt<12>(Disp));
return (Base << 12) | Disp;
}
uint64_t SystemZMCCodeEmitter::
getBDAddr20Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
assert(isUInt<4>(Base) && isInt<20>(Disp));
return (Base << 20) | ((Disp & 0xfff) << 8) | ((Disp & 0xff000) >> 12);
}
uint64_t SystemZMCCodeEmitter::
getBDXAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
uint64_t Index = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups, STI);
assert(isUInt<4>(Base) && isUInt<12>(Disp) && isUInt<4>(Index));
return (Index << 16) | (Base << 12) | Disp;
}
uint64_t SystemZMCCodeEmitter::
getBDXAddr20Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
uint64_t Index = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups, STI);
assert(isUInt<4>(Base) && isInt<20>(Disp) && isUInt<4>(Index));
return (Index << 24) | (Base << 20) | ((Disp & 0xfff) << 8)
| ((Disp & 0xff000) >> 12);
}
uint64_t SystemZMCCodeEmitter::
getBDLAddr12Len8Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
uint64_t Len = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups, STI) - 1;
assert(isUInt<4>(Base) && isUInt<12>(Disp) && isUInt<8>(Len));
return (Len << 16) | (Base << 12) | Disp;
}
uint64_t SystemZMCCodeEmitter::
getBDRAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
uint64_t Len = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups, STI);
assert(isUInt<4>(Base) && isUInt<12>(Disp) && isUInt<4>(Len));
return (Len << 16) | (Base << 12) | Disp;
}
uint64_t SystemZMCCodeEmitter::
getBDVAddr12Encoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups, STI);
uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups, STI);
uint64_t Index = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups, STI);
assert(isUInt<4>(Base) && isUInt<12>(Disp) && isUInt<5>(Index));
return (Index << 16) | (Base << 12) | Disp;
}
uint64_t
SystemZMCCodeEmitter::getPCRelEncoding(const MCInst &MI, unsigned OpNum,
SmallVectorImpl<MCFixup> &Fixups,
unsigned Kind, int64_t Offset,
bool AllowTLS) const {
const MCOperand &MO = MI.getOperand(OpNum);
const MCExpr *Expr;
if (MO.isImm())
Expr = MCConstantExpr::create(MO.getImm() + Offset, Ctx);
else {
Expr = MO.getExpr();
if (Offset) {
// The operand value is relative to the start of MI, but the fixup
// is relative to the operand field itself, which is Offset bytes
// into MI. Add Offset to the relocation value to cancel out
// this difference.
const MCExpr *OffsetExpr = MCConstantExpr::create(Offset, Ctx);
Expr = MCBinaryExpr::createAdd(Expr, OffsetExpr, Ctx);
}
}
Fixups.push_back(MCFixup::create(Offset, Expr, (MCFixupKind)Kind));
// Output the fixup for the TLS marker if present.
if (AllowTLS && OpNum + 1 < MI.getNumOperands()) {
const MCOperand &MOTLS = MI.getOperand(OpNum + 1);
Fixups.push_back(MCFixup::create(0, MOTLS.getExpr(),
(MCFixupKind)SystemZ::FK_390_TLS_CALL));
}
return 0;
}
#define ENABLE_INSTR_PREDICATE_VERIFIER
#include "SystemZGenMCCodeEmitter.inc"
MCCodeEmitter *llvm::createSystemZMCCodeEmitter(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
MCContext &Ctx) {
return new SystemZMCCodeEmitter(MCII, Ctx);
}
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