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https://github.com/c64scene-ar/llvm-6502.git
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This is similar to implicit register operands. MC doesn't understand register liveness and call clobbers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148437 91177308-0d34-0410-b5e6-96231b3b80d8
170 lines
5.2 KiB
C++
170 lines
5.2 KiB
C++
//===-- MBlazeMCInstLower.cpp - Convert MBlaze MachineInstr to an MCInst---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code to lower MBlaze MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "MBlazeMCInstLower.h"
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#include "MBlazeInstrInfo.h"
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#include "llvm/Constants.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/MC/MCAsmInfo.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/MCInst.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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MCSymbol *MBlazeMCInstLower::
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GetGlobalAddressSymbol(const MachineOperand &MO) const {
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switch (MO.getTargetFlags()) {
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default: llvm_unreachable("Unknown target flag on GV operand");
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case 0: break;
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}
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return Printer.Mang->getSymbol(MO.getGlobal());
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}
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MCSymbol *MBlazeMCInstLower::
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GetExternalSymbolSymbol(const MachineOperand &MO) const {
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switch (MO.getTargetFlags()) {
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default: llvm_unreachable("Unknown target flag on GV operand");
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case 0: break;
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}
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return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
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}
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MCSymbol *MBlazeMCInstLower::
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GetJumpTableSymbol(const MachineOperand &MO) const {
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SmallString<256> Name;
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raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
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<< Printer.getFunctionNumber() << '_'
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<< MO.getIndex();
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switch (MO.getTargetFlags()) {
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default: llvm_unreachable("Unknown target flag on GV operand");
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case 0: break;
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}
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// Create a symbol for the name.
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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCSymbol *MBlazeMCInstLower::
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GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
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SmallString<256> Name;
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raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
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<< Printer.getFunctionNumber() << '_'
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<< MO.getIndex();
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switch (MO.getTargetFlags()) {
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default:
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llvm_unreachable("Unknown target flag on GV operand");
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case 0: break;
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}
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// Create a symbol for the name.
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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCSymbol *MBlazeMCInstLower::
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GetBlockAddressSymbol(const MachineOperand &MO) const {
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switch (MO.getTargetFlags()) {
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default:
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assert(0 && "Unknown target flag on GV operand");
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case 0: break;
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}
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return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
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}
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MCOperand MBlazeMCInstLower::
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LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
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// FIXME: We would like an efficient form for this, so we don't have to do a
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// lot of extra uniquing.
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const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
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switch (MO.getTargetFlags()) {
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default:
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llvm_unreachable("Unknown target flag on GV operand");
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case 0: break;
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}
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if (!MO.isJTI() && MO.getOffset())
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Expr = MCBinaryExpr::CreateAdd(Expr,
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MCConstantExpr::Create(MO.getOffset(), Ctx),
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Ctx);
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return MCOperand::CreateExpr(Expr);
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}
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void MBlazeMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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MCOperand MCOp;
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switch (MO.getType()) {
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default: llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit()) continue;
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MCOp = MCOperand::CreateReg(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::CreateImm(MO.getImm());
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break;
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
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MO.getMBB()->getSymbol(), Ctx));
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break;
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case MachineOperand::MO_GlobalAddress:
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MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
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break;
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case MachineOperand::MO_ExternalSymbol:
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MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
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break;
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case MachineOperand::MO_JumpTableIndex:
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MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
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break;
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case MachineOperand::MO_BlockAddress:
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MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
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break;
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case MachineOperand::MO_FPImmediate: {
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bool ignored;
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APFloat FVal = MO.getFPImm()->getValueAPF();
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FVal.convert(APFloat::IEEEsingle, APFloat::rmTowardZero, &ignored);
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APInt IVal = FVal.bitcastToAPInt();
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uint64_t Val = *IVal.getRawData();
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MCOp = MCOperand::CreateImm(Val);
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break;
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}
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case MachineOperand::MO_RegisterMask:
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continue;
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}
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OutMI.addOperand(MCOp);
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}
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}
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