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//===-- ARMMCInstLower.cpp - Convert ARM MachineInstr to an MCInst --------===//
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// The LLVM Compiler Infrastructure
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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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// This file contains code to lower ARM MachineInstrs to their corresponding
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//===----------------------------------------------------------------------===//
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#include "ARMMCInstLower.h"
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//#include "llvm/CodeGen/MachineModuleInfoImpls.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/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/MC/MCStreamer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallString.h"
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const ARMSubtarget &ARMMCInstLower::getSubtarget() const {
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return AsmPrinter.getSubtarget();
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MachineModuleInfoMachO &ARMMCInstLower::getMachOMMI() const {
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assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
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return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
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MCSymbol *ARMMCInstLower::
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GetGlobalAddressSymbol(const MachineOperand &MO) const {
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// FIXME: HANDLE PLT references how??
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switch (MO.getTargetFlags()) {
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default: assert(0 && "Unknown target flag on GV operand");
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return Printer.GetGlobalValueSymbol(MO.getGlobal());
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MCSymbol *ARMMCInstLower::
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GetExternalSymbolSymbol(const MachineOperand &MO) const {
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// FIXME: HANDLE PLT references how??
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switch (MO.getTargetFlags()) {
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default: assert(0 && "Unknown target flag on GV operand");
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return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
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MCSymbol *ARMMCInstLower::
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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() << '_' << 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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// Create a symbol for the name.
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return Ctx.GetOrCreateSymbol(Name.str());
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MCSymbol *ARMMCInstLower::
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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() << '_' << 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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// Create a symbol for the name.
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return Ctx.GetOrCreateSymbol(Name.str());
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MCOperand ARMMCInstLower::
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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: llvm_unreachable("Unknown target flag on GV operand");
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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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return MCOperand::CreateExpr(Expr);
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void ARMMCInstLower::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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switch (MO.getType()) {
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assert(0 && "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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assert(!MO.getSubReg() && "Subregs should be eliminated!");
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MCOp = MCOperand::CreateReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::CreateImm(MO.getImm());
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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), Ctx));
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case MachineOperand::MO_GlobalAddress:
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MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
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case MachineOperand::MO_ExternalSymbol:
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MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
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case MachineOperand::MO_JumpTableIndex:
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MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
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case MachineOperand::MO_BlockAddress:
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MCOp = LowerSymbolOperand(MO, Printer.GetBlockAddressSymbol(
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MO.getBlockAddress()));
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OutMI.addOperand(MCOp);