8de9f2b558
SubtargetFeature.h is currently part of MC while it doesn't depend on anything in MC. Since some LLVM components might have the need to work with target features without necessarily needing MC, it might be worthwhile to move SubtargetFeature.h to a different location. This will reduce the dependencies of said components. Note that I choose TargetParser as the destination because that's where Triple lives and SubtargetFeatures feels related to that. This issues came up during a JITLink review (D149522). JITLink would like to avoid a dependency on MC while still needing to store target features. Reviewed By: MaskRay, arsenm Differential Revision: https://reviews.llvm.org/D150549
251 lines
8.9 KiB
C++
251 lines
8.9 KiB
C++
//===-- SparcMCCodeEmitter.cpp - Convert Sparc code to machine code -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SparcMCCodeEmitter class.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/SparcFixupKinds.h"
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#include "SparcMCExpr.h"
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#include "SparcMCTargetDesc.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TargetParser/SubtargetFeature.h"
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#include <cassert>
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#include <cstdint>
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using namespace llvm;
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#define DEBUG_TYPE "mccodeemitter"
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STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
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namespace {
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class SparcMCCodeEmitter : public MCCodeEmitter {
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MCContext &Ctx;
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public:
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SparcMCCodeEmitter(const MCInstrInfo &, MCContext &ctx)
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: Ctx(ctx) {}
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SparcMCCodeEmitter(const SparcMCCodeEmitter &) = delete;
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SparcMCCodeEmitter &operator=(const SparcMCCodeEmitter &) = delete;
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~SparcMCCodeEmitter() override = default;
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void encodeInstruction(const MCInst &MI, SmallVectorImpl<char> &CB,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const override;
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// getBinaryCodeForInstr - TableGen'erated function for getting the
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// binary encoding for an instruction.
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uint64_t getBinaryCodeForInstr(const MCInst &MI,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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/// getMachineOpValue - Return binary encoding of operand. If the machine
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/// operand requires relocation, record the relocation and return zero.
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unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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unsigned getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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unsigned getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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unsigned getSImm13OpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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unsigned getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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unsigned getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const;
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};
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} // end anonymous namespace
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void SparcMCCodeEmitter::encodeInstruction(const MCInst &MI,
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SmallVectorImpl<char> &CB,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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unsigned Bits = getBinaryCodeForInstr(MI, Fixups, STI);
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support::endian::write(CB, Bits,
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Ctx.getAsmInfo()->isLittleEndian() ? support::little
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: support::big);
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// Some instructions have phantom operands that only contribute a fixup entry.
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unsigned SymOpNo = 0;
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switch (MI.getOpcode()) {
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default: break;
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case SP::TLS_CALL: SymOpNo = 1; break;
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case SP::GDOP_LDrr:
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case SP::GDOP_LDXrr:
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case SP::TLS_ADDrr:
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case SP::TLS_ADDXrr:
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case SP::TLS_LDrr:
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case SP::TLS_LDXrr: SymOpNo = 3; break;
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}
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if (SymOpNo != 0) {
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const MCOperand &MO = MI.getOperand(SymOpNo);
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uint64_t op = getMachineOpValue(MI, MO, Fixups, STI);
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assert(op == 0 && "Unexpected operand value!");
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(void)op; // suppress warning.
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}
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++MCNumEmitted; // Keep track of the # of mi's emitted.
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}
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unsigned SparcMCCodeEmitter::
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getMachineOpValue(const MCInst &MI, const MCOperand &MO,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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if (MO.isReg())
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return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
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if (MO.isImm())
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return MO.getImm();
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assert(MO.isExpr());
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const MCExpr *Expr = MO.getExpr();
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if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr)) {
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MCFixupKind Kind = (MCFixupKind)SExpr->getFixupKind();
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Fixups.push_back(MCFixup::create(0, Expr, Kind));
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return 0;
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}
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int64_t Res;
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if (Expr->evaluateAsAbsolute(Res))
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return Res;
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llvm_unreachable("Unhandled expression!");
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return 0;
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}
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unsigned
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SparcMCCodeEmitter::getSImm13OpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isImm())
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return MO.getImm();
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assert(MO.isExpr() &&
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"getSImm13OpValue expects only expressions or an immediate");
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const MCExpr *Expr = MO.getExpr();
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// Constant value, no fixup is needed
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if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr))
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return CE->getValue();
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MCFixupKind Kind;
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if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr)) {
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Kind = MCFixupKind(SExpr->getFixupKind());
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} else {
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bool IsPic = Ctx.getObjectFileInfo()->isPositionIndependent();
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Kind = IsPic ? MCFixupKind(Sparc::fixup_sparc_got13)
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: MCFixupKind(Sparc::fixup_sparc_13);
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}
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Fixups.push_back(MCFixup::create(0, Expr, Kind));
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return 0;
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}
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unsigned SparcMCCodeEmitter::
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getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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const MCExpr *Expr = MO.getExpr();
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const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr);
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if (MI.getOpcode() == SP::TLS_CALL) {
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// No fixups for __tls_get_addr. Will emit for fixups for tls_symbol in
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// encodeInstruction.
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#ifndef NDEBUG
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// Verify that the callee is actually __tls_get_addr.
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assert(SExpr && SExpr->getSubExpr()->getKind() == MCExpr::SymbolRef &&
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"Unexpected expression in TLS_CALL");
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const MCSymbolRefExpr *SymExpr = cast<MCSymbolRefExpr>(SExpr->getSubExpr());
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assert(SymExpr->getSymbol().getName() == "__tls_get_addr" &&
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"Unexpected function for TLS_CALL");
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#endif
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return 0;
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}
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MCFixupKind Kind = MCFixupKind(SExpr->getFixupKind());
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Fixups.push_back(MCFixup::create(0, Expr, Kind));
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return 0;
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}
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unsigned SparcMCCodeEmitter::
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getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI);
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(MCFixupKind)Sparc::fixup_sparc_br22));
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return 0;
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}
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unsigned SparcMCCodeEmitter::
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getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI);
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Fixups.push_back(MCFixup::create(0, MO.getExpr(),
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(MCFixupKind)Sparc::fixup_sparc_br19));
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return 0;
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}
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unsigned SparcMCCodeEmitter::
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getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
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SmallVectorImpl<MCFixup> &Fixups,
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const MCSubtargetInfo &STI) const {
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const MCOperand &MO = MI.getOperand(OpNo);
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if (MO.isReg() || MO.isImm())
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return getMachineOpValue(MI, MO, Fixups, STI);
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Fixups.push_back(
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MCFixup::create(0, MO.getExpr(), (MCFixupKind)Sparc::fixup_sparc_br16));
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return 0;
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}
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#include "SparcGenMCCodeEmitter.inc"
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MCCodeEmitter *llvm::createSparcMCCodeEmitter(const MCInstrInfo &MCII,
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MCContext &Ctx) {
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return new SparcMCCodeEmitter(MCII, Ctx);
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}
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