mirror of
https://github.com/c64scene-ar/llvm-6502.git
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3bd52827bd
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80807 91177308-0d34-0410-b5e6-96231b3b80d8
282 lines
9.7 KiB
C++
282 lines
9.7 KiB
C++
//===-- X86MCInstLower.cpp - Convert X86 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 X86 MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ATTAsmPrinter.h"
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#include "X86MCAsmInfo.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/FormattedStream.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() {
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// FIXME: the actual label generated doesn't matter here! Just mangle in
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// something unique (the function number) with Private prefix.
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SmallString<60> Name;
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if (Subtarget->isTargetDarwin()) {
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raw_svector_ostream(Name) << 'L' << getFunctionNumber() << "$pb";
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} else {
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assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
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raw_svector_ostream(Name) << ".Lllvm$" << getFunctionNumber()<<".$piclabel";
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}
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return OutContext.GetOrCreateSymbol(StringRef(Name.data(), Name.size()));
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}
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static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
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// Convert registers in the addr mode according to subreg64.
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for (unsigned i = 0; i != 4; ++i) {
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if (!MI->getOperand(i).isReg()) continue;
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unsigned Reg = MI->getOperand(i).getReg();
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if (Reg == 0) continue;
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MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
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}
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}
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/// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
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/// MCOperand.
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MCOperand X86ATTAsmPrinter::LowerGlobalAddressOperand(const MachineOperand &MO){
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const GlobalValue *GV = MO.getGlobal();
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const char *Suffix = "";
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
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Suffix = "$stub";
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else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
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MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
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Suffix = "$non_lazy_ptr";
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std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
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if (Subtarget->isTargetCygMing())
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DecorateCygMingName(Name, GV);
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// Handle dllimport linkage.
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if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
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Name = "__imp_" + Name;
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if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
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GVStubs[Name] = Mang->getMangledName(GV);
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else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
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MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
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HiddenGVStubs[Name] = Mang->getMangledName(GV);
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else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
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FnStubs[Name] = Mang->getMangledName(GV);
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// Handle target operand flags.
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// FIXME: This should be common between external symbols, constant pool etc.
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MCSymbol *NegatedSymbol = 0;
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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 X86II::MO_NO_FLAG: // No flag.
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break;
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DARWIN_HIDDEN_NONLAZY:
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case X86II::MO_DLLIMPORT:
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case X86II::MO_DARWIN_STUB:
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// These affect the name of the symbol, not any suffix.
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break;
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case X86II::MO_GOT_ABSOLUTE_ADDRESS:
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assert(0 && "Reloc mode unimp!");
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//O << " + [.-";
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//PrintPICBaseSymbol();
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//O << ']';
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break;
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case X86II::MO_PIC_BASE_OFFSET:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
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// Subtract the pic base.
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NegatedSymbol = GetPICBaseSymbol();
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break;
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// FIXME: These probably should be a modifier on the symbol or something??
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case X86II::MO_TLSGD: Name += "@TLSGD"; break;
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case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
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case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
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case X86II::MO_TPOFF: Name += "@TPOFF"; break;
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case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
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case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
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case X86II::MO_GOT: Name += "@GOT"; break;
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case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
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case X86II::MO_PLT: Name += "@PLT"; break;
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}
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// Create a symbol for the name.
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MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
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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, OutContext);
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if (NegatedSymbol)
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Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
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OutContext),
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OutContext);
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if (MO.getOffset())
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Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
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OutContext),
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OutContext);
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return MCOperand::CreateExpr(Expr);
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}
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MCOperand X86ATTAsmPrinter::
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LowerExternalSymbolOperand(const MachineOperand &MO) {
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std::string Name = Mang->makeNameProper(MO.getSymbolName());
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
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FnStubs[Name+"$stub"] = Name;
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Name += "$stub";
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}
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MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name);
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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, OutContext);
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if (MO.getOffset())
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Expr = MCBinaryExpr::CreateAdd(Expr,
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MCConstantExpr::Create(MO.getOffset(),
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OutContext),
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OutContext);
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return MCOperand::CreateExpr(Expr);
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}
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MCOperand X86ATTAsmPrinter::LowerJumpTableOperand(const MachineOperand &MO) {
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SmallString<256> Name;
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raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
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<< getFunctionNumber() << '_' << MO.getIndex();
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MCSymbol *NegatedSymbol = 0;
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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 X86II::MO_PIC_BASE_OFFSET:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
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// Subtract the pic base.
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NegatedSymbol = GetPICBaseSymbol();
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break;
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}
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// Create a symbol for the name.
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MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
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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, OutContext);
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if (NegatedSymbol)
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Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(NegatedSymbol,
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OutContext),
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OutContext);
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return MCOperand::CreateExpr(Expr);
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}
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void X86ATTAsmPrinter::
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printInstructionThroughMCStreamer(const MachineInstr *MI) {
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MCInst TmpInst;
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switch (MI->getOpcode()) {
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case TargetInstrInfo::DBG_LABEL:
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case TargetInstrInfo::EH_LABEL:
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case TargetInstrInfo::GC_LABEL:
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printLabel(MI);
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return;
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case TargetInstrInfo::INLINEASM:
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O << '\t';
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printInlineAsm(MI);
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return;
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case TargetInstrInfo::IMPLICIT_DEF:
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printImplicitDef(MI);
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return;
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case X86::MOVPC32r: {
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// This is a pseudo op for a two instruction sequence with a label, which
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// looks like:
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// call "L1$pb"
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// "L1$pb":
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// popl %esi
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// Emit the call.
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MCSymbol *PICBase = GetPICBaseSymbol();
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TmpInst.setOpcode(X86::CALLpcrel32);
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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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TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
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OutContext)));
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printInstruction(&TmpInst);
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// Emit the label.
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OutStreamer.EmitLabel(PICBase);
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// popl $reg
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TmpInst.setOpcode(X86::POP32r);
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TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
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printInstruction(&TmpInst);
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return;
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}
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}
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TmpInst.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:
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O.flush();
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errs() << "Cannot lower operand #" << i << " of :" << *MI;
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llvm_unreachable("Unimp");
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case MachineOperand::MO_JumpTableIndex:
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MCOp = LowerJumpTableOperand(MO);
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break;
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case MachineOperand::MO_Register:
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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::CreateMBBLabel(getFunctionNumber(),
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MO.getMBB()->getNumber());
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break;
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case MachineOperand::MO_GlobalAddress:
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MCOp = LowerGlobalAddressOperand(MO);
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break;
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case MachineOperand::MO_ExternalSymbol:
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MCOp = LowerExternalSymbolOperand(MO);
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break;
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}
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TmpInst.addOperand(MCOp);
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}
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switch (TmpInst.getOpcode()) {
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case X86::LEA64_32r:
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// Handle the 'subreg rewriting' for the lea64_32mem operand.
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lower_lea64_32mem(&TmpInst, 1);
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break;
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}
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printInstruction(&TmpInst);
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}
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