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e9434dbff4
this means that it can only lower one MachineInstr to one MCInst. To make this fly, we need to pull out handling of MO_GOT_ABSOLUTE_ADDRESS (which generates an implicit label) out of X86MCInstLower. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81629 91177308-0d34-0410-b5e6-96231b3b80d8
489 lines
16 KiB
C++
489 lines
16 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 "X86MCInstLower.h"
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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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const X86Subtarget &X86MCInstLower::getSubtarget() const {
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return AsmPrinter.getSubtarget();
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}
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MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
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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 (getSubtarget().isTargetDarwin()) {
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raw_svector_ostream(Name) << 'L' << AsmPrinter.getFunctionNumber() << "$pb";
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} else {
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assert(getSubtarget().isTargetELF() && "Don't know how to print PIC label!");
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raw_svector_ostream(Name) << ".Lllvm$" << AsmPrinter.getFunctionNumber()
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<< ".$piclabel";
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}
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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCOperand X86MCInstLower::LowerMBBOperand(const MachineOperand &MO) const {
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SmallString<60> Name;
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raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "BB"
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<< AsmPrinter.getFunctionNumber() << '_' << MO.getMBB()->getNumber();
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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return MCOperand::CreateExpr(MCSymbolRefExpr::Create(Sym, Ctx));
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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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MCSymbol *X86MCInstLower::
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GetGlobalAddressSymbol(const MachineOperand &MO) const {
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const GlobalValue *GV = MO.getGlobal();
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bool isImplicitlyPrivate = false;
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if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
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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_PIC_BASE)
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isImplicitlyPrivate = true;
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SmallString<128> Name;
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Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
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if (getSubtarget().isTargetCygMing())
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AsmPrinter.DecorateCygMingName(Name, GV);
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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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case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
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break;
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case X86II::MO_DLLIMPORT: {
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// Handle dllimport linkage.
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const char *Prefix = "__imp_";
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Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
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break;
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}
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case X86II::MO_DARWIN_NONLAZY:
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case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
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Name += "$non_lazy_ptr";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MCSymbol *&StubSym = AsmPrinter.GVStubs[Sym];
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if (StubSym == 0) {
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Name.clear();
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Mang->getNameWithPrefix(Name, GV, false);
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StubSym = Ctx.GetOrCreateSymbol(Name.str());
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}
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return Sym;
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}
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case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
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Name += "$non_lazy_ptr";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MCSymbol *&StubSym = AsmPrinter.HiddenGVStubs[Sym];
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if (StubSym == 0) {
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Name.clear();
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Mang->getNameWithPrefix(Name, GV, false);
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StubSym = Ctx.GetOrCreateSymbol(Name.str());
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}
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return Sym;
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}
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case X86II::MO_DARWIN_STUB: {
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Name += "$stub";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
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if (StubSym == 0) {
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Name.clear();
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Mang->getNameWithPrefix(Name, GV, false);
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StubSym = Ctx.GetOrCreateSymbol(Name.str());
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}
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return Sym;
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}
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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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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCSymbol *X86MCInstLower::
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GetExternalSymbolSymbol(const MachineOperand &MO) const {
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SmallString<128> Name;
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Name += AsmPrinter.MAI->getGlobalPrefix();
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Name += MO.getSymbolName();
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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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case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
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case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
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break;
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case X86II::MO_DLLIMPORT: {
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// Handle dllimport linkage.
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const char *Prefix = "__imp_";
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Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
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break;
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}
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case X86II::MO_DARWIN_STUB: {
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Name += "$stub";
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MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
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MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
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if (StubSym == 0) {
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Name.erase(Name.end()-5, Name.end());
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StubSym = Ctx.GetOrCreateSymbol(Name.str());
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}
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return Sym;
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}
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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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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
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SmallString<256> Name;
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raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
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<< AsmPrinter.getFunctionNumber() << '_' << 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 X86II::MO_NO_FLAG: // No flag.
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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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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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return Ctx.GetOrCreateSymbol(Name.str());
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}
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MCSymbol *X86MCInstLower::
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GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
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SmallString<256> Name;
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raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
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<< AsmPrinter.getFunctionNumber() << '_' << 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 X86II::MO_NO_FLAG: // No flag.
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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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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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return Ctx.GetOrCreateSymbol(Name.str());
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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 = 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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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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case X86II::MO_TLSGD:
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case X86II::MO_GOTTPOFF:
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case X86II::MO_INDNTPOFF:
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case X86II::MO_TPOFF:
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case X86II::MO_NTPOFF:
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case X86II::MO_GOTPCREL:
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case X86II::MO_GOT:
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case X86II::MO_GOTOFF:
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case X86II::MO_PLT:
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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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Expr = MCBinaryExpr::CreateSub(Expr,
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MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
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Ctx);
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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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static void lower_subreg32(MCInst *MI, unsigned OpNo) {
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// Convert registers in the addr mode according to subreg32.
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unsigned Reg = MI->getOperand(OpNo).getReg();
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if (Reg != 0)
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MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
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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(OpNo+i).isReg()) continue;
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unsigned Reg = MI->getOperand(OpNo+i).getReg();
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if (Reg == 0) continue;
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MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
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}
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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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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 = LowerMBBOperand(MO);
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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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}
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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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switch (OutMI.getOpcode()) {
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case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
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lower_lea64_32mem(&OutMI, 1);
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break;
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case X86::MOV16r0:
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OutMI.setOpcode(X86::MOV32r0);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX16rr8:
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OutMI.setOpcode(X86::MOVZX32rr8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX16rm8:
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OutMI.setOpcode(X86::MOVZX32rm8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVSX16rr8:
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OutMI.setOpcode(X86::MOVSX32rr8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVSX16rm8:
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OutMI.setOpcode(X86::MOVSX32rm8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rr32:
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OutMI.setOpcode(X86::MOV32rr);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rm32:
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OutMI.setOpcode(X86::MOV32rm);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOV64ri64i32:
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OutMI.setOpcode(X86::MOV32ri);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rr8:
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OutMI.setOpcode(X86::MOVZX32rr8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rm8:
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OutMI.setOpcode(X86::MOVZX32rm8);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rr16:
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OutMI.setOpcode(X86::MOVZX32rr16);
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lower_subreg32(&OutMI, 0);
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break;
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case X86::MOVZX64rm16:
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OutMI.setOpcode(X86::MOVZX32rm16);
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lower_subreg32(&OutMI, 0);
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break;
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}
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}
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void X86ATTAsmPrinter::
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printInstructionThroughMCStreamer(const MachineInstr *MI) {
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X86MCInstLower MCInstLowering(OutContext, Mang, *this);
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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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MCInst TmpInst;
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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 = MCInstLowering.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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O << '\n';
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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());
|
|
printInstruction(&TmpInst);
|
|
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. We know that this operand flag occurs at most once per function.
|
|
SmallString<64> Name;
|
|
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
|
|
<< "picbaseref" << getFunctionNumber();
|
|
MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str());
|
|
OutStreamer.EmitLabel(DotSym);
|
|
|
|
// Now that we have emitted the label, lower the complex operand expression.
|
|
MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
|
|
|
|
const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
|
|
const MCExpr *PICBase =
|
|
MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
|
|
DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
|
|
|
|
DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
|
|
DotExpr, OutContext);
|
|
|
|
MCInst TmpInst;
|
|
TmpInst.setOpcode(X86::ADD32ri);
|
|
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
|
|
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
|
|
TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
|
|
printInstruction(&TmpInst);
|
|
return;
|
|
}
|
|
}
|
|
|
|
MCInst TmpInst;
|
|
MCInstLowering.Lower(MI, TmpInst);
|
|
|
|
|
|
printInstruction(&TmpInst);
|
|
}
|