mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8e0f67dcec
Before this patch any program that wanted to know the final symbol name of a GlobalValue had to link with Target. This patch implements a compromise solution where the mangler uses DataLayout. This way, any tool that already links with Target (llc, clang) gets the exact behavior as before and new IR files can be mangled without linking with Target. With this patch the mangler is constructed with just a DataLayout and DataLayout is extended to include the information the Mangler needs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198438 91177308-0d34-0410-b5e6-96231b3b80d8
885 lines
34 KiB
C++
885 lines
34 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 "X86AsmPrinter.h"
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#include "InstPrinter/X86ATTInstPrinter.h"
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#include "X86COFFMachineModuleInfo.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/CodeGen/StackMaps.h"
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#include "llvm/IR/Type.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/MCInstBuilder.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/Mangler.h"
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using namespace llvm;
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namespace {
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/// X86MCInstLower - This class is used to lower an MachineInstr into an MCInst.
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class X86MCInstLower {
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MCContext &Ctx;
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const MachineFunction &MF;
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const TargetMachine &TM;
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const MCAsmInfo &MAI;
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X86AsmPrinter &AsmPrinter;
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public:
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X86MCInstLower(const MachineFunction &MF, X86AsmPrinter &asmprinter);
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void Lower(const MachineInstr *MI, MCInst &OutMI) const;
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MCSymbol *GetSymbolFromOperand(const MachineOperand &MO) const;
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MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
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private:
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MachineModuleInfoMachO &getMachOMMI() const;
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Mangler *getMang() const {
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return AsmPrinter.Mang;
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}
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};
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} // end anonymous namespace
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X86MCInstLower::X86MCInstLower(const MachineFunction &mf,
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X86AsmPrinter &asmprinter)
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: Ctx(mf.getContext()), MF(mf), TM(mf.getTarget()),
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MAI(*TM.getMCAsmInfo()), AsmPrinter(asmprinter) {}
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MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
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return MF.getMMI().getObjFileInfo<MachineModuleInfoMachO>();
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}
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/// GetSymbolFromOperand - Lower an MO_GlobalAddress or MO_ExternalSymbol
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/// operand to an MCSymbol.
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MCSymbol *X86MCInstLower::
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GetSymbolFromOperand(const MachineOperand &MO) const {
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const DataLayout *DL = TM.getDataLayout();
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assert((MO.isGlobal() || MO.isSymbol() || MO.isMBB()) && "Isn't a symbol reference");
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SmallString<128> Name;
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StringRef Suffix;
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switch (MO.getTargetFlags()) {
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case X86II::MO_DLLIMPORT:
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// Handle dllimport linkage.
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Name += "__imp_";
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break;
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case X86II::MO_DARWIN_STUB:
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Suffix = "$stub";
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break;
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
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Suffix = "$non_lazy_ptr";
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break;
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}
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if (!Suffix.empty())
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Name += DL->getPrivateGlobalPrefix();
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unsigned PrefixLen = Name.size();
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if (MO.isGlobal()) {
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const GlobalValue *GV = MO.getGlobal();
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getMang()->getNameWithPrefix(Name, GV);
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} else if (MO.isSymbol()) {
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getMang()->getNameWithPrefix(Name, MO.getSymbolName());
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} else if (MO.isMBB()) {
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Name += MO.getMBB()->getSymbol()->getName();
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}
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unsigned OrigLen = Name.size() - PrefixLen;
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Name += Suffix;
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
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StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
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// If the target flags on the operand changes the name of the symbol, do that
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// before we return the symbol.
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switch (MO.getTargetFlags()) {
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default: break;
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
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MachineModuleInfoImpl::StubValueTy &StubSym =
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getMachOMMI().getGVStubEntry(Sym);
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if (StubSym.getPointer() == 0) {
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assert(MO.isGlobal() && "Extern symbol not handled yet");
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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}
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break;
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}
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
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MachineModuleInfoImpl::StubValueTy &StubSym =
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getMachOMMI().getHiddenGVStubEntry(Sym);
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if (StubSym.getPointer() == 0) {
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assert(MO.isGlobal() && "Extern symbol not handled yet");
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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}
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break;
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}
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case X86II::MO_DARWIN_STUB: {
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MachineModuleInfoImpl::StubValueTy &StubSym =
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getMachOMMI().getFnStubEntry(Sym);
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if (StubSym.getPointer())
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return Sym;
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if (MO.isGlobal()) {
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
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!MO.getGlobal()->hasInternalLinkage());
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} else {
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StubSym =
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MachineModuleInfoImpl::
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StubValueTy(Ctx.GetOrCreateSymbol(OrigName), false);
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}
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break;
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}
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}
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return Sym;
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}
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MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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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 = 0;
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MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
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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 X86II::MO_NO_FLAG: // No flag.
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// These affect the name of the symbol, not any suffix.
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DLLIMPORT:
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case X86II::MO_DARWIN_STUB:
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break;
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case X86II::MO_TLVP: RefKind = MCSymbolRefExpr::VK_TLVP; break;
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case X86II::MO_TLVP_PIC_BASE:
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Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx);
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// Subtract the pic base.
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Expr = MCBinaryExpr::CreateSub(Expr,
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MCSymbolRefExpr::Create(MF.getPICBaseSymbol(),
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Ctx),
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Ctx);
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break;
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case X86II::MO_SECREL: RefKind = MCSymbolRefExpr::VK_SECREL; break;
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case X86II::MO_TLSGD: RefKind = MCSymbolRefExpr::VK_TLSGD; break;
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case X86II::MO_TLSLD: RefKind = MCSymbolRefExpr::VK_TLSLD; break;
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case X86II::MO_TLSLDM: RefKind = MCSymbolRefExpr::VK_TLSLDM; break;
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case X86II::MO_GOTTPOFF: RefKind = MCSymbolRefExpr::VK_GOTTPOFF; break;
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case X86II::MO_INDNTPOFF: RefKind = MCSymbolRefExpr::VK_INDNTPOFF; break;
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case X86II::MO_TPOFF: RefKind = MCSymbolRefExpr::VK_TPOFF; break;
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case X86II::MO_DTPOFF: RefKind = MCSymbolRefExpr::VK_DTPOFF; break;
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case X86II::MO_NTPOFF: RefKind = MCSymbolRefExpr::VK_NTPOFF; break;
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case X86II::MO_GOTNTPOFF: RefKind = MCSymbolRefExpr::VK_GOTNTPOFF; break;
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case X86II::MO_GOTPCREL: RefKind = MCSymbolRefExpr::VK_GOTPCREL; break;
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case X86II::MO_GOT: RefKind = MCSymbolRefExpr::VK_GOT; break;
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case X86II::MO_GOTOFF: RefKind = MCSymbolRefExpr::VK_GOTOFF; break;
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case X86II::MO_PLT: RefKind = MCSymbolRefExpr::VK_PLT; 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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Expr = MCSymbolRefExpr::Create(Sym, Ctx);
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// Subtract the pic base.
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Expr = MCBinaryExpr::CreateSub(Expr,
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MCSymbolRefExpr::Create(MF.getPICBaseSymbol(), Ctx),
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Ctx);
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if (MO.isJTI() && MAI.hasSetDirective()) {
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// If .set directive is supported, use it to reduce the number of
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// relocations the assembler will generate for differences between
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// local labels. This is only safe when the symbols are in the same
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// section so we are restricting it to jumptable references.
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MCSymbol *Label = Ctx.CreateTempSymbol();
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AsmPrinter.OutStreamer.EmitAssignment(Label, Expr);
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Expr = MCSymbolRefExpr::Create(Label, Ctx);
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}
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break;
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}
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if (Expr == 0)
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Expr = MCSymbolRefExpr::Create(Sym, RefKind, Ctx);
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if (!MO.isJTI() && !MO.isMBB() && 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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/// \brief Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with
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/// a short fixed-register form.
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static void SimplifyShortImmForm(MCInst &Inst, unsigned Opcode) {
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unsigned ImmOp = Inst.getNumOperands() - 1;
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assert(Inst.getOperand(0).isReg() &&
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(Inst.getOperand(ImmOp).isImm() || Inst.getOperand(ImmOp).isExpr()) &&
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((Inst.getNumOperands() == 3 && Inst.getOperand(1).isReg() &&
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Inst.getOperand(0).getReg() == Inst.getOperand(1).getReg()) ||
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Inst.getNumOperands() == 2) && "Unexpected instruction!");
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// Check whether the destination register can be fixed.
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unsigned Reg = Inst.getOperand(0).getReg();
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if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX)
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return;
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// If so, rewrite the instruction.
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MCOperand Saved = Inst.getOperand(ImmOp);
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Inst = MCInst();
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Inst.setOpcode(Opcode);
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Inst.addOperand(Saved);
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}
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/// \brief If a movsx instruction has a shorter encoding for the used register
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/// simplify the instruction to use it instead.
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static void SimplifyMOVSX(MCInst &Inst) {
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unsigned NewOpcode = 0;
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unsigned Op0 = Inst.getOperand(0).getReg(), Op1 = Inst.getOperand(1).getReg();
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switch (Inst.getOpcode()) {
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default:
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llvm_unreachable("Unexpected instruction!");
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case X86::MOVSX16rr8: // movsbw %al, %ax --> cbtw
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if (Op0 == X86::AX && Op1 == X86::AL)
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NewOpcode = X86::CBW;
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break;
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case X86::MOVSX32rr16: // movswl %ax, %eax --> cwtl
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if (Op0 == X86::EAX && Op1 == X86::AX)
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NewOpcode = X86::CWDE;
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break;
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case X86::MOVSX64rr32: // movslq %eax, %rax --> cltq
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if (Op0 == X86::RAX && Op1 == X86::EAX)
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NewOpcode = X86::CDQE;
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break;
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}
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if (NewOpcode != 0) {
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Inst = MCInst();
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Inst.setOpcode(NewOpcode);
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}
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}
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/// \brief Simplify things like MOV32rm to MOV32o32a.
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static void SimplifyShortMoveForm(X86AsmPrinter &Printer, MCInst &Inst,
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unsigned Opcode) {
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// Don't make these simplifications in 64-bit mode; other assemblers don't
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// perform them because they make the code larger.
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if (Printer.getSubtarget().is64Bit())
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return;
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bool IsStore = Inst.getOperand(0).isReg() && Inst.getOperand(1).isReg();
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unsigned AddrBase = IsStore;
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unsigned RegOp = IsStore ? 0 : 5;
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unsigned AddrOp = AddrBase + 3;
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assert(Inst.getNumOperands() == 6 && Inst.getOperand(RegOp).isReg() &&
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Inst.getOperand(AddrBase + 0).isReg() && // base
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Inst.getOperand(AddrBase + 1).isImm() && // scale
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Inst.getOperand(AddrBase + 2).isReg() && // index register
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(Inst.getOperand(AddrOp).isExpr() || // address
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Inst.getOperand(AddrOp).isImm())&&
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Inst.getOperand(AddrBase + 4).isReg() && // segment
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"Unexpected instruction!");
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// Check whether the destination register can be fixed.
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unsigned Reg = Inst.getOperand(RegOp).getReg();
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if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX)
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return;
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// Check whether this is an absolute address.
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// FIXME: We know TLVP symbol refs aren't, but there should be a better way
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// to do this here.
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bool Absolute = true;
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if (Inst.getOperand(AddrOp).isExpr()) {
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const MCExpr *MCE = Inst.getOperand(AddrOp).getExpr();
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if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(MCE))
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if (SRE->getKind() == MCSymbolRefExpr::VK_TLVP)
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Absolute = false;
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}
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if (Absolute &&
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(Inst.getOperand(AddrBase + 0).getReg() != 0 ||
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Inst.getOperand(AddrBase + 2).getReg() != 0 ||
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Inst.getOperand(AddrBase + 4).getReg() != 0 ||
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Inst.getOperand(AddrBase + 1).getImm() != 1))
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return;
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// If so, rewrite the instruction.
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MCOperand Saved = Inst.getOperand(AddrOp);
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Inst = MCInst();
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Inst.setOpcode(Opcode);
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Inst.addOperand(Saved);
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}
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void X86MCInstLower::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:
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MI->dump();
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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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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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MCOp = LowerSymbolOperand(MO, GetSymbolFromOperand(MO));
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break;
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case MachineOperand::MO_JumpTableIndex:
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MCOp = LowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex()));
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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MCOp = LowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex()));
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break;
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case MachineOperand::MO_BlockAddress:
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MCOp = LowerSymbolOperand(MO,
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AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()));
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break;
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case MachineOperand::MO_RegisterMask:
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// Ignore call clobbers.
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continue;
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}
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OutMI.addOperand(MCOp);
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}
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// Handle a few special cases to eliminate operand modifiers.
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ReSimplify:
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switch (OutMI.getOpcode()) {
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case X86::LEA64_32r:
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case X86::LEA64r:
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case X86::LEA16r:
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case X86::LEA32r:
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// LEA should have a segment register, but it must be empty.
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assert(OutMI.getNumOperands() == 1+X86::AddrNumOperands &&
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"Unexpected # of LEA operands");
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assert(OutMI.getOperand(1+X86::AddrSegmentReg).getReg() == 0 &&
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"LEA has segment specified!");
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break;
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case X86::MOV32ri64:
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OutMI.setOpcode(X86::MOV32ri);
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break;
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// Commute operands to get a smaller encoding by using VEX.R instead of VEX.B
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// if one of the registers is extended, but other isn't.
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case X86::VMOVAPDrr:
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case X86::VMOVAPDYrr:
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case X86::VMOVAPSrr:
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case X86::VMOVAPSYrr:
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case X86::VMOVDQArr:
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case X86::VMOVDQAYrr:
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case X86::VMOVDQUrr:
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case X86::VMOVDQUYrr:
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case X86::VMOVUPDrr:
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case X86::VMOVUPDYrr:
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case X86::VMOVUPSrr:
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case X86::VMOVUPSYrr: {
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if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
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X86II::isX86_64ExtendedReg(OutMI.getOperand(1).getReg())) {
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unsigned NewOpc;
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switch (OutMI.getOpcode()) {
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default: llvm_unreachable("Invalid opcode");
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case X86::VMOVAPDrr: NewOpc = X86::VMOVAPDrr_REV; break;
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case X86::VMOVAPDYrr: NewOpc = X86::VMOVAPDYrr_REV; break;
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case X86::VMOVAPSrr: NewOpc = X86::VMOVAPSrr_REV; break;
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case X86::VMOVAPSYrr: NewOpc = X86::VMOVAPSYrr_REV; break;
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case X86::VMOVDQArr: NewOpc = X86::VMOVDQArr_REV; break;
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case X86::VMOVDQAYrr: NewOpc = X86::VMOVDQAYrr_REV; break;
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case X86::VMOVDQUrr: NewOpc = X86::VMOVDQUrr_REV; break;
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case X86::VMOVDQUYrr: NewOpc = X86::VMOVDQUYrr_REV; break;
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case X86::VMOVUPDrr: NewOpc = X86::VMOVUPDrr_REV; break;
|
|
case X86::VMOVUPDYrr: NewOpc = X86::VMOVUPDYrr_REV; break;
|
|
case X86::VMOVUPSrr: NewOpc = X86::VMOVUPSrr_REV; break;
|
|
case X86::VMOVUPSYrr: NewOpc = X86::VMOVUPSYrr_REV; break;
|
|
}
|
|
OutMI.setOpcode(NewOpc);
|
|
}
|
|
break;
|
|
}
|
|
case X86::VMOVSDrr:
|
|
case X86::VMOVSSrr: {
|
|
if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
|
|
X86II::isX86_64ExtendedReg(OutMI.getOperand(2).getReg())) {
|
|
unsigned NewOpc;
|
|
switch (OutMI.getOpcode()) {
|
|
default: llvm_unreachable("Invalid opcode");
|
|
case X86::VMOVSDrr: NewOpc = X86::VMOVSDrr_REV; break;
|
|
case X86::VMOVSSrr: NewOpc = X86::VMOVSSrr_REV; break;
|
|
}
|
|
OutMI.setOpcode(NewOpc);
|
|
}
|
|
break;
|
|
}
|
|
|
|
// TAILJMPr64, CALL64r, CALL64pcrel32 - These instructions have register
|
|
// inputs modeled as normal uses instead of implicit uses. As such, truncate
|
|
// off all but the first operand (the callee). FIXME: Change isel.
|
|
case X86::TAILJMPr64:
|
|
case X86::CALL64r:
|
|
case X86::CALL64pcrel32: {
|
|
unsigned Opcode = OutMI.getOpcode();
|
|
MCOperand Saved = OutMI.getOperand(0);
|
|
OutMI = MCInst();
|
|
OutMI.setOpcode(Opcode);
|
|
OutMI.addOperand(Saved);
|
|
break;
|
|
}
|
|
|
|
case X86::EH_RETURN:
|
|
case X86::EH_RETURN64: {
|
|
OutMI = MCInst();
|
|
OutMI.setOpcode(X86::RET);
|
|
break;
|
|
}
|
|
|
|
// TAILJMPd, TAILJMPd64 - Lower to the correct jump instructions.
|
|
case X86::TAILJMPr:
|
|
case X86::TAILJMPd:
|
|
case X86::TAILJMPd64: {
|
|
unsigned Opcode;
|
|
switch (OutMI.getOpcode()) {
|
|
default: llvm_unreachable("Invalid opcode");
|
|
case X86::TAILJMPr: Opcode = X86::JMP32r; break;
|
|
case X86::TAILJMPd:
|
|
case X86::TAILJMPd64: Opcode = X86::JMP_1; break;
|
|
}
|
|
|
|
MCOperand Saved = OutMI.getOperand(0);
|
|
OutMI = MCInst();
|
|
OutMI.setOpcode(Opcode);
|
|
OutMI.addOperand(Saved);
|
|
break;
|
|
}
|
|
|
|
// These are pseudo-ops for OR to help with the OR->ADD transformation. We do
|
|
// this with an ugly goto in case the resultant OR uses EAX and needs the
|
|
// short form.
|
|
case X86::ADD16rr_DB: OutMI.setOpcode(X86::OR16rr); goto ReSimplify;
|
|
case X86::ADD32rr_DB: OutMI.setOpcode(X86::OR32rr); goto ReSimplify;
|
|
case X86::ADD64rr_DB: OutMI.setOpcode(X86::OR64rr); goto ReSimplify;
|
|
case X86::ADD16ri_DB: OutMI.setOpcode(X86::OR16ri); goto ReSimplify;
|
|
case X86::ADD32ri_DB: OutMI.setOpcode(X86::OR32ri); goto ReSimplify;
|
|
case X86::ADD64ri32_DB: OutMI.setOpcode(X86::OR64ri32); goto ReSimplify;
|
|
case X86::ADD16ri8_DB: OutMI.setOpcode(X86::OR16ri8); goto ReSimplify;
|
|
case X86::ADD32ri8_DB: OutMI.setOpcode(X86::OR32ri8); goto ReSimplify;
|
|
case X86::ADD64ri8_DB: OutMI.setOpcode(X86::OR64ri8); goto ReSimplify;
|
|
|
|
// The assembler backend wants to see branches in their small form and relax
|
|
// them to their large form. The JIT can only handle the large form because
|
|
// it does not do relaxation. For now, translate the large form to the
|
|
// small one here.
|
|
case X86::JMP_4: OutMI.setOpcode(X86::JMP_1); break;
|
|
case X86::JO_4: OutMI.setOpcode(X86::JO_1); break;
|
|
case X86::JNO_4: OutMI.setOpcode(X86::JNO_1); break;
|
|
case X86::JB_4: OutMI.setOpcode(X86::JB_1); break;
|
|
case X86::JAE_4: OutMI.setOpcode(X86::JAE_1); break;
|
|
case X86::JE_4: OutMI.setOpcode(X86::JE_1); break;
|
|
case X86::JNE_4: OutMI.setOpcode(X86::JNE_1); break;
|
|
case X86::JBE_4: OutMI.setOpcode(X86::JBE_1); break;
|
|
case X86::JA_4: OutMI.setOpcode(X86::JA_1); break;
|
|
case X86::JS_4: OutMI.setOpcode(X86::JS_1); break;
|
|
case X86::JNS_4: OutMI.setOpcode(X86::JNS_1); break;
|
|
case X86::JP_4: OutMI.setOpcode(X86::JP_1); break;
|
|
case X86::JNP_4: OutMI.setOpcode(X86::JNP_1); break;
|
|
case X86::JL_4: OutMI.setOpcode(X86::JL_1); break;
|
|
case X86::JGE_4: OutMI.setOpcode(X86::JGE_1); break;
|
|
case X86::JLE_4: OutMI.setOpcode(X86::JLE_1); break;
|
|
case X86::JG_4: OutMI.setOpcode(X86::JG_1); break;
|
|
|
|
// Atomic load and store require a separate pseudo-inst because Acquire
|
|
// implies mayStore and Release implies mayLoad; fix these to regular MOV
|
|
// instructions here
|
|
case X86::ACQUIRE_MOV8rm: OutMI.setOpcode(X86::MOV8rm); goto ReSimplify;
|
|
case X86::ACQUIRE_MOV16rm: OutMI.setOpcode(X86::MOV16rm); goto ReSimplify;
|
|
case X86::ACQUIRE_MOV32rm: OutMI.setOpcode(X86::MOV32rm); goto ReSimplify;
|
|
case X86::ACQUIRE_MOV64rm: OutMI.setOpcode(X86::MOV64rm); goto ReSimplify;
|
|
case X86::RELEASE_MOV8mr: OutMI.setOpcode(X86::MOV8mr); goto ReSimplify;
|
|
case X86::RELEASE_MOV16mr: OutMI.setOpcode(X86::MOV16mr); goto ReSimplify;
|
|
case X86::RELEASE_MOV32mr: OutMI.setOpcode(X86::MOV32mr); goto ReSimplify;
|
|
case X86::RELEASE_MOV64mr: OutMI.setOpcode(X86::MOV64mr); goto ReSimplify;
|
|
|
|
// We don't currently select the correct instruction form for instructions
|
|
// which have a short %eax, etc. form. Handle this by custom lowering, for
|
|
// now.
|
|
//
|
|
// Note, we are currently not handling the following instructions:
|
|
// MOV64ao8, MOV64o8a
|
|
// XCHG16ar, XCHG32ar, XCHG64ar
|
|
case X86::MOV8mr_NOREX:
|
|
case X86::MOV8mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV8ao8); break;
|
|
case X86::MOV8rm_NOREX:
|
|
case X86::MOV8rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV8o8a); break;
|
|
case X86::MOV16mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV16ao16); break;
|
|
case X86::MOV16rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV16o16a); break;
|
|
case X86::MOV32mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV32ao32); break;
|
|
case X86::MOV32rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV32o32a); break;
|
|
|
|
case X86::ADC8ri: SimplifyShortImmForm(OutMI, X86::ADC8i8); break;
|
|
case X86::ADC16ri: SimplifyShortImmForm(OutMI, X86::ADC16i16); break;
|
|
case X86::ADC32ri: SimplifyShortImmForm(OutMI, X86::ADC32i32); break;
|
|
case X86::ADC64ri32: SimplifyShortImmForm(OutMI, X86::ADC64i32); break;
|
|
case X86::ADD8ri: SimplifyShortImmForm(OutMI, X86::ADD8i8); break;
|
|
case X86::ADD16ri: SimplifyShortImmForm(OutMI, X86::ADD16i16); break;
|
|
case X86::ADD32ri: SimplifyShortImmForm(OutMI, X86::ADD32i32); break;
|
|
case X86::ADD64ri32: SimplifyShortImmForm(OutMI, X86::ADD64i32); break;
|
|
case X86::AND8ri: SimplifyShortImmForm(OutMI, X86::AND8i8); break;
|
|
case X86::AND16ri: SimplifyShortImmForm(OutMI, X86::AND16i16); break;
|
|
case X86::AND32ri: SimplifyShortImmForm(OutMI, X86::AND32i32); break;
|
|
case X86::AND64ri32: SimplifyShortImmForm(OutMI, X86::AND64i32); break;
|
|
case X86::CMP8ri: SimplifyShortImmForm(OutMI, X86::CMP8i8); break;
|
|
case X86::CMP16ri: SimplifyShortImmForm(OutMI, X86::CMP16i16); break;
|
|
case X86::CMP32ri: SimplifyShortImmForm(OutMI, X86::CMP32i32); break;
|
|
case X86::CMP64ri32: SimplifyShortImmForm(OutMI, X86::CMP64i32); break;
|
|
case X86::OR8ri: SimplifyShortImmForm(OutMI, X86::OR8i8); break;
|
|
case X86::OR16ri: SimplifyShortImmForm(OutMI, X86::OR16i16); break;
|
|
case X86::OR32ri: SimplifyShortImmForm(OutMI, X86::OR32i32); break;
|
|
case X86::OR64ri32: SimplifyShortImmForm(OutMI, X86::OR64i32); break;
|
|
case X86::SBB8ri: SimplifyShortImmForm(OutMI, X86::SBB8i8); break;
|
|
case X86::SBB16ri: SimplifyShortImmForm(OutMI, X86::SBB16i16); break;
|
|
case X86::SBB32ri: SimplifyShortImmForm(OutMI, X86::SBB32i32); break;
|
|
case X86::SBB64ri32: SimplifyShortImmForm(OutMI, X86::SBB64i32); break;
|
|
case X86::SUB8ri: SimplifyShortImmForm(OutMI, X86::SUB8i8); break;
|
|
case X86::SUB16ri: SimplifyShortImmForm(OutMI, X86::SUB16i16); break;
|
|
case X86::SUB32ri: SimplifyShortImmForm(OutMI, X86::SUB32i32); break;
|
|
case X86::SUB64ri32: SimplifyShortImmForm(OutMI, X86::SUB64i32); break;
|
|
case X86::TEST8ri: SimplifyShortImmForm(OutMI, X86::TEST8i8); break;
|
|
case X86::TEST16ri: SimplifyShortImmForm(OutMI, X86::TEST16i16); break;
|
|
case X86::TEST32ri: SimplifyShortImmForm(OutMI, X86::TEST32i32); break;
|
|
case X86::TEST64ri32: SimplifyShortImmForm(OutMI, X86::TEST64i32); break;
|
|
case X86::XOR8ri: SimplifyShortImmForm(OutMI, X86::XOR8i8); break;
|
|
case X86::XOR16ri: SimplifyShortImmForm(OutMI, X86::XOR16i16); break;
|
|
case X86::XOR32ri: SimplifyShortImmForm(OutMI, X86::XOR32i32); break;
|
|
case X86::XOR64ri32: SimplifyShortImmForm(OutMI, X86::XOR64i32); break;
|
|
|
|
// Try to shrink some forms of movsx.
|
|
case X86::MOVSX16rr8:
|
|
case X86::MOVSX32rr16:
|
|
case X86::MOVSX64rr32:
|
|
SimplifyMOVSX(OutMI);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void LowerTlsAddr(MCStreamer &OutStreamer,
|
|
X86MCInstLower &MCInstLowering,
|
|
const MachineInstr &MI) {
|
|
|
|
bool is64Bits = MI.getOpcode() == X86::TLS_addr64 ||
|
|
MI.getOpcode() == X86::TLS_base_addr64;
|
|
|
|
bool needsPadding = MI.getOpcode() == X86::TLS_addr64;
|
|
|
|
MCContext &context = OutStreamer.getContext();
|
|
|
|
if (needsPadding)
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
|
|
|
|
MCSymbolRefExpr::VariantKind SRVK;
|
|
switch (MI.getOpcode()) {
|
|
case X86::TLS_addr32:
|
|
case X86::TLS_addr64:
|
|
SRVK = MCSymbolRefExpr::VK_TLSGD;
|
|
break;
|
|
case X86::TLS_base_addr32:
|
|
SRVK = MCSymbolRefExpr::VK_TLSLDM;
|
|
break;
|
|
case X86::TLS_base_addr64:
|
|
SRVK = MCSymbolRefExpr::VK_TLSLD;
|
|
break;
|
|
default:
|
|
llvm_unreachable("unexpected opcode");
|
|
}
|
|
|
|
MCSymbol *sym = MCInstLowering.GetSymbolFromOperand(MI.getOperand(3));
|
|
const MCSymbolRefExpr *symRef = MCSymbolRefExpr::Create(sym, SRVK, context);
|
|
|
|
MCInst LEA;
|
|
if (is64Bits) {
|
|
LEA.setOpcode(X86::LEA64r);
|
|
LEA.addOperand(MCOperand::CreateReg(X86::RDI)); // dest
|
|
LEA.addOperand(MCOperand::CreateReg(X86::RIP)); // base
|
|
LEA.addOperand(MCOperand::CreateImm(1)); // scale
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // index
|
|
LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // seg
|
|
} else if (SRVK == MCSymbolRefExpr::VK_TLSLDM) {
|
|
LEA.setOpcode(X86::LEA32r);
|
|
LEA.addOperand(MCOperand::CreateReg(X86::EAX)); // dest
|
|
LEA.addOperand(MCOperand::CreateReg(X86::EBX)); // base
|
|
LEA.addOperand(MCOperand::CreateImm(1)); // scale
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // index
|
|
LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // seg
|
|
} else {
|
|
LEA.setOpcode(X86::LEA32r);
|
|
LEA.addOperand(MCOperand::CreateReg(X86::EAX)); // dest
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // base
|
|
LEA.addOperand(MCOperand::CreateImm(1)); // scale
|
|
LEA.addOperand(MCOperand::CreateReg(X86::EBX)); // index
|
|
LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
|
|
LEA.addOperand(MCOperand::CreateReg(0)); // seg
|
|
}
|
|
OutStreamer.EmitInstruction(LEA);
|
|
|
|
if (needsPadding) {
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::REX64_PREFIX));
|
|
}
|
|
|
|
StringRef name = is64Bits ? "__tls_get_addr" : "___tls_get_addr";
|
|
MCSymbol *tlsGetAddr = context.GetOrCreateSymbol(name);
|
|
const MCSymbolRefExpr *tlsRef =
|
|
MCSymbolRefExpr::Create(tlsGetAddr,
|
|
MCSymbolRefExpr::VK_PLT,
|
|
context);
|
|
|
|
OutStreamer.EmitInstruction(MCInstBuilder(is64Bits ? X86::CALL64pcrel32
|
|
: X86::CALLpcrel32)
|
|
.addExpr(tlsRef));
|
|
}
|
|
|
|
/// \brief Emit the optimal amount of multi-byte nops on X86.
|
|
static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit) {
|
|
// This works only for 64bit. For 32bit we have to do additional checking if
|
|
// the CPU supports multi-byte nops.
|
|
assert(Is64Bit && "EmitNops only supports X86-64");
|
|
while (NumBytes) {
|
|
unsigned Opc, BaseReg, ScaleVal, IndexReg, Displacement, SegmentReg;
|
|
Opc = IndexReg = Displacement = SegmentReg = 0;
|
|
BaseReg = X86::RAX; ScaleVal = 1;
|
|
switch (NumBytes) {
|
|
case 0: llvm_unreachable("Zero nops?"); break;
|
|
case 1: NumBytes -= 1; Opc = X86::NOOP; break;
|
|
case 2: NumBytes -= 2; Opc = X86::XCHG16ar; break;
|
|
case 3: NumBytes -= 3; Opc = X86::NOOPL; break;
|
|
case 4: NumBytes -= 4; Opc = X86::NOOPL; Displacement = 8; break;
|
|
case 5: NumBytes -= 5; Opc = X86::NOOPL; Displacement = 8;
|
|
IndexReg = X86::RAX; break;
|
|
case 6: NumBytes -= 6; Opc = X86::NOOPW; Displacement = 8;
|
|
IndexReg = X86::RAX; break;
|
|
case 7: NumBytes -= 7; Opc = X86::NOOPL; Displacement = 512; break;
|
|
case 8: NumBytes -= 8; Opc = X86::NOOPL; Displacement = 512;
|
|
IndexReg = X86::RAX; break;
|
|
case 9: NumBytes -= 9; Opc = X86::NOOPW; Displacement = 512;
|
|
IndexReg = X86::RAX; break;
|
|
default: NumBytes -= 10; Opc = X86::NOOPW; Displacement = 512;
|
|
IndexReg = X86::RAX; SegmentReg = X86::CS; break;
|
|
}
|
|
|
|
unsigned NumPrefixes = std::min(NumBytes, 5U);
|
|
NumBytes -= NumPrefixes;
|
|
for (unsigned i = 0; i != NumPrefixes; ++i)
|
|
OS.EmitBytes("\x66");
|
|
|
|
switch (Opc) {
|
|
default: llvm_unreachable("Unexpected opcode"); break;
|
|
case X86::NOOP:
|
|
OS.EmitInstruction(MCInstBuilder(Opc));
|
|
break;
|
|
case X86::XCHG16ar:
|
|
OS.EmitInstruction(MCInstBuilder(Opc).addReg(X86::AX));
|
|
break;
|
|
case X86::NOOPL:
|
|
case X86::NOOPW:
|
|
OS.EmitInstruction(MCInstBuilder(Opc).addReg(BaseReg).addImm(ScaleVal)
|
|
.addReg(IndexReg)
|
|
.addImm(Displacement)
|
|
.addReg(SegmentReg));
|
|
break;
|
|
}
|
|
} // while (NumBytes)
|
|
}
|
|
|
|
// Lower a stackmap of the form:
|
|
// <id>, <shadowBytes>, ...
|
|
static void LowerSTACKMAP(MCStreamer &OS, StackMaps &SM,
|
|
const MachineInstr &MI, bool Is64Bit) {
|
|
unsigned NumBytes = MI.getOperand(1).getImm();
|
|
SM.recordStackMap(MI);
|
|
// Emit padding.
|
|
// FIXME: These nops ensure that the stackmap's shadow is covered by
|
|
// instructions from the same basic block, but the nops should not be
|
|
// necessary if instructions from the same block follow the stackmap.
|
|
EmitNops(OS, NumBytes, Is64Bit);
|
|
}
|
|
|
|
// Lower a patchpoint of the form:
|
|
// [<def>], <id>, <numBytes>, <target>, <numArgs>, <cc>, ...
|
|
static void LowerPATCHPOINT(MCStreamer &OS, StackMaps &SM,
|
|
const MachineInstr &MI, bool Is64Bit) {
|
|
assert(Is64Bit && "Patchpoint currently only supports X86-64");
|
|
SM.recordPatchPoint(MI);
|
|
|
|
PatchPointOpers opers(&MI);
|
|
unsigned ScratchIdx = opers.getNextScratchIdx();
|
|
unsigned EncodedBytes = 0;
|
|
int64_t CallTarget = opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
|
|
if (CallTarget) {
|
|
// Emit MOV to materialize the target address and the CALL to target.
|
|
// This is encoded with 12-13 bytes, depending on which register is used.
|
|
unsigned ScratchReg = MI.getOperand(ScratchIdx).getReg();
|
|
if (X86II::isX86_64ExtendedReg(ScratchReg))
|
|
EncodedBytes = 13;
|
|
else
|
|
EncodedBytes = 12;
|
|
OS.EmitInstruction(MCInstBuilder(X86::MOV64ri).addReg(ScratchReg)
|
|
.addImm(CallTarget));
|
|
OS.EmitInstruction(MCInstBuilder(X86::CALL64r).addReg(ScratchReg));
|
|
}
|
|
// Emit padding.
|
|
unsigned NumBytes = opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
|
|
assert(NumBytes >= EncodedBytes &&
|
|
"Patchpoint can't request size less than the length of a call.");
|
|
|
|
EmitNops(OS, NumBytes - EncodedBytes, Is64Bit);
|
|
}
|
|
|
|
void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
|
|
X86MCInstLower MCInstLowering(*MF, *this);
|
|
switch (MI->getOpcode()) {
|
|
case TargetOpcode::DBG_VALUE:
|
|
llvm_unreachable("Should be handled target independently");
|
|
|
|
// Emit nothing here but a comment if we can.
|
|
case X86::Int_MemBarrier:
|
|
if (OutStreamer.hasRawTextSupport())
|
|
OutStreamer.EmitRawText(StringRef("\t#MEMBARRIER"));
|
|
return;
|
|
|
|
|
|
case X86::EH_RETURN:
|
|
case X86::EH_RETURN64: {
|
|
// Lower these as normal, but add some comments.
|
|
unsigned Reg = MI->getOperand(0).getReg();
|
|
OutStreamer.AddComment(StringRef("eh_return, addr: %") +
|
|
X86ATTInstPrinter::getRegisterName(Reg));
|
|
break;
|
|
}
|
|
case X86::TAILJMPr:
|
|
case X86::TAILJMPd:
|
|
case X86::TAILJMPd64:
|
|
// Lower these as normal, but add some comments.
|
|
OutStreamer.AddComment("TAILCALL");
|
|
break;
|
|
|
|
case X86::TLS_addr32:
|
|
case X86::TLS_addr64:
|
|
case X86::TLS_base_addr32:
|
|
case X86::TLS_base_addr64:
|
|
return LowerTlsAddr(OutStreamer, MCInstLowering, *MI);
|
|
|
|
case X86::MOVPC32r: {
|
|
// This is a pseudo op for a two instruction sequence with a label, which
|
|
// looks like:
|
|
// call "L1$pb"
|
|
// "L1$pb":
|
|
// popl %esi
|
|
|
|
// Emit the call.
|
|
MCSymbol *PICBase = MF->getPICBaseSymbol();
|
|
// FIXME: We would like an efficient form for this, so we don't have to do a
|
|
// lot of extra uniquing.
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::CALLpcrel32)
|
|
.addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
|
|
|
|
// Emit the label.
|
|
OutStreamer.EmitLabel(PICBase);
|
|
|
|
// popl $reg
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::POP32r)
|
|
.addReg(MI->getOperand(0).getReg()));
|
|
return;
|
|
}
|
|
|
|
case X86::ADD32ri: {
|
|
// Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
|
|
if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
|
|
break;
|
|
|
|
// Okay, we have something like:
|
|
// EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
|
|
|
|
// For this, we want to print something like:
|
|
// MYGLOBAL + (. - PICBASE)
|
|
// However, we can't generate a ".", so just emit a new label here and refer
|
|
// to it.
|
|
MCSymbol *DotSym = OutContext.CreateTempSymbol();
|
|
OutStreamer.EmitLabel(DotSym);
|
|
|
|
// Now that we have emitted the label, lower the complex operand expression.
|
|
MCSymbol *OpSym = MCInstLowering.GetSymbolFromOperand(MI->getOperand(2));
|
|
|
|
const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
|
|
const MCExpr *PICBase =
|
|
MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), OutContext);
|
|
DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
|
|
|
|
DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
|
|
DotExpr, OutContext);
|
|
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::ADD32ri)
|
|
.addReg(MI->getOperand(0).getReg())
|
|
.addReg(MI->getOperand(1).getReg())
|
|
.addExpr(DotExpr));
|
|
return;
|
|
}
|
|
|
|
case TargetOpcode::STACKMAP:
|
|
return LowerSTACKMAP(OutStreamer, SM, *MI, Subtarget->is64Bit());
|
|
|
|
case TargetOpcode::PATCHPOINT:
|
|
return LowerPATCHPOINT(OutStreamer, SM, *MI, Subtarget->is64Bit());
|
|
|
|
case X86::MORESTACK_RET:
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::RET));
|
|
return;
|
|
|
|
case X86::MORESTACK_RET_RESTORE_R10:
|
|
// Return, then restore R10.
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::RET));
|
|
OutStreamer.EmitInstruction(MCInstBuilder(X86::MOV64rr)
|
|
.addReg(X86::R10)
|
|
.addReg(X86::RAX));
|
|
return;
|
|
}
|
|
|
|
MCInst TmpInst;
|
|
MCInstLowering.Lower(MI, TmpInst);
|
|
OutStreamer.EmitInstruction(TmpInst);
|
|
}
|