b19b6d9fab
Similar to previous migration done for other targets (PowerPC, X86, ARM, etc). Switch from the confusing VariantKind to Specifier, which aligns with Arm and IBM AIX's documentation. In addition, rename *MCExpr::getKind, which confusingly shadows the base class getKind. In the future, relocation specifiers should be encoded as part of SystemZMCExpr instead of MCSymbolRefExpr.
101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
//===-- SystemZMCInstLower.cpp - Lower MachineInstr to MCInst -------------===//
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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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#include "SystemZMCInstLower.h"
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#include "MCTargetDesc/SystemZMCExpr.h"
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#include "SystemZAsmPrinter.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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// Return the VK_* enumeration for MachineOperand target flags Flags.
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static SystemZMCExpr::Specifier getSpecifierForTFlags(unsigned Flags) {
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switch (Flags & SystemZII::MO_SYMBOL_MODIFIER) {
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case 0:
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return SystemZMCExpr::VK_None;
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case SystemZII::MO_GOT:
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return SystemZMCExpr::VK_GOT;
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case SystemZII::MO_INDNTPOFF:
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return SystemZMCExpr::VK_INDNTPOFF;
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}
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llvm_unreachable("Unrecognised MO_ACCESS_MODEL");
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}
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SystemZMCInstLower::SystemZMCInstLower(MCContext &ctx,
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SystemZAsmPrinter &asmprinter)
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: Ctx(ctx), AsmPrinter(asmprinter) {}
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const MCExpr *SystemZMCInstLower::getExpr(const MachineOperand &MO,
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SystemZMCExpr::Specifier Spec) const {
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const MCSymbol *Symbol;
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bool HasOffset = true;
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switch (MO.getType()) {
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case MachineOperand::MO_MachineBasicBlock:
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Symbol = MO.getMBB()->getSymbol();
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HasOffset = false;
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break;
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case MachineOperand::MO_GlobalAddress:
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Symbol = AsmPrinter.getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
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HasOffset = false;
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
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break;
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default:
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llvm_unreachable("unknown operand type");
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}
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const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Spec, Ctx);
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if (HasOffset)
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if (int64_t Offset = MO.getOffset()) {
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const MCExpr *OffsetExpr = MCConstantExpr::create(Offset, Ctx);
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Expr = MCBinaryExpr::createAdd(Expr, OffsetExpr, Ctx);
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}
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return Expr;
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}
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MCOperand SystemZMCInstLower::lowerOperand(const MachineOperand &MO) const {
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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return MCOperand::createReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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return MCOperand::createImm(MO.getImm());
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default: {
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SystemZMCExpr::Specifier Kind = getSpecifierForTFlags(MO.getTargetFlags());
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return MCOperand::createExpr(getExpr(MO, Kind));
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}
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}
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}
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void SystemZMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (const MachineOperand &MO : MI->operands())
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// Ignore all implicit register operands.
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if (!MO.isReg() || !MO.isImplicit())
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OutMI.addOperand(lowerOperand(MO));
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}
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