//===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file contains code to lower X86 MachineInstrs to their corresponding // MCInst records. // //===----------------------------------------------------------------------===// #include "X86ATTAsmPrinter.h" #include "X86MCAsmInfo.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" #include "llvm/MC/MCStreamer.h" #include "llvm/Support/FormattedStream.h" #include "llvm/Support/Mangler.h" #include "llvm/ADT/SmallString.h" using namespace llvm; MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() { // FIXME: the actual label generated doesn't matter here! Just mangle in // something unique (the function number) with Private prefix. SmallString<60> Name; if (Subtarget->isTargetDarwin()) { raw_svector_ostream(Name) << 'L' << getFunctionNumber() << "$pb"; } else { assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!"); raw_svector_ostream(Name) << ".Lllvm$" << getFunctionNumber()<<".$piclabel"; } return OutContext.GetOrCreateSymbol(Name.str()); } /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an /// MCOperand. MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) { const GlobalValue *GV = MO.getGlobal(); bool isImplicitlyPrivate = false; if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB || MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE || MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE) isImplicitlyPrivate = true; SmallString<128> Name; Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate); if (Subtarget->isTargetCygMing()) DecorateCygMingName(Name, GV); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name. case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name. break; case X86II::MO_DLLIMPORT: { // Handle dllimport linkage. const char *Prefix = "__imp_"; Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix)); break; } case X86II::MO_DARWIN_NONLAZY: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: Name += "$non_lazy_ptr"; GVStubs[Name.str()] = StringRef(Name.data(), Name.size()-13); break; case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: Name += "$non_lazy_ptr"; HiddenGVStubs[Name.str()] = StringRef(Name.data(), Name.size()-13); break; case X86II::MO_DARWIN_STUB: { Name += "$stub"; MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str()); FnStubs.insert(Sym); return Sym; } // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } return OutContext.GetOrCreateSymbol(Name.str()); } MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) { SmallString<128> Name; Name += MAI->getGlobalPrefix(); Name += MO.getSymbolName(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name. case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name. break; case X86II::MO_DLLIMPORT: { // Handle dllimport linkage. const char *Prefix = "__imp_"; Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix)); break; } case X86II::MO_DARWIN_STUB: { Name += "$stub"; MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str()); FnStubs.insert(Sym); return Sym; } // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } return OutContext.GetOrCreateSymbol(Name.str()); } MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) { SmallString<256> Name; raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_' << MO.getIndex(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: break; // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } // Create a symbol for the name. return OutContext.GetOrCreateSymbol(Name.str()); } MCSymbol *X86ATTAsmPrinter:: GetConstantPoolIndexSymbol(const MachineOperand &MO) { SmallString<256> Name; raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' << MO.getIndex(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: break; // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } // Create a symbol for the name. return OutContext.GetOrCreateSymbol(Name.str()); } MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) { // FIXME: We would like an efficient form for this, so we don't have to do a // lot of extra uniquing. const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, OutContext); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. // These affect the name of the symbol, not any suffix. case X86II::MO_DARWIN_NONLAZY: case X86II::MO_DLLIMPORT: case X86II::MO_DARWIN_STUB: case X86II::MO_TLSGD: case X86II::MO_GOTTPOFF: case X86II::MO_INDNTPOFF: case X86II::MO_TPOFF: case X86II::MO_NTPOFF: case X86II::MO_GOTPCREL: case X86II::MO_GOT: case X86II::MO_GOTOFF: case X86II::MO_PLT: break; case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: // Subtract the pic base. Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(GetPICBaseSymbol(), OutContext), OutContext); break; case X86II::MO_GOT_ABSOLUTE_ADDRESS: { // For this, we want to print something like: // MYSYMBOL + (. - 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); const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext); const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(), OutContext); DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext); Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext); break; } } if (!MO.isJTI() && MO.getOffset()) Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(), OutContext), OutContext); return MCOperand::CreateExpr(Expr); } static void lower_subreg32(MCInst *MI, unsigned OpNo) { // Convert registers in the addr mode according to subreg32. unsigned Reg = MI->getOperand(OpNo).getReg(); if (Reg != 0) MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32)); } static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) { // Convert registers in the addr mode according to subreg64. for (unsigned i = 0; i != 4; ++i) { if (!MI->getOperand(OpNo+i).isReg()) continue; unsigned Reg = MI->getOperand(OpNo+i).getReg(); if (Reg == 0) continue; MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64)); } } void X86ATTAsmPrinter:: printInstructionThroughMCStreamer(const MachineInstr *MI) { MCInst TmpInst; switch (MI->getOpcode()) { case TargetInstrInfo::DBG_LABEL: case TargetInstrInfo::EH_LABEL: case TargetInstrInfo::GC_LABEL: printLabel(MI); return; case TargetInstrInfo::INLINEASM: O << '\t'; printInlineAsm(MI); return; case TargetInstrInfo::IMPLICIT_DEF: printImplicitDef(MI); return; 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 = GetPICBaseSymbol(); TmpInst.setOpcode(X86::CALLpcrel32); // FIXME: We would like an efficient form for this, so we don't have to do a // lot of extra uniquing. TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase, OutContext))); printInstruction(&TmpInst); O << '\n'; // Emit the label. OutStreamer.EmitLabel(PICBase); // popl $reg TmpInst.setOpcode(X86::POP32r); TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg()); printInstruction(&TmpInst); return; } } TmpInst.setOpcode(MI->getOpcode()); for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { const MachineOperand &MO = MI->getOperand(i); MCOperand MCOp; switch (MO.getType()) { default: O.flush(); errs() << "Cannot lower operand #" << i << " of :" << *MI; llvm_unreachable("Unimp"); case MachineOperand::MO_Register: MCOp = MCOperand::CreateReg(MO.getReg()); break; case MachineOperand::MO_Immediate: MCOp = MCOperand::CreateImm(MO.getImm()); break; case MachineOperand::MO_MachineBasicBlock: MCOp = MCOperand::CreateMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber()); break; case MachineOperand::MO_GlobalAddress: MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO)); break; case MachineOperand::MO_ExternalSymbol: MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO)); break; case MachineOperand::MO_JumpTableIndex: MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO)); break; case MachineOperand::MO_ConstantPoolIndex: MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO)); break; } TmpInst.addOperand(MCOp); } // Handle a few special cases to eliminate operand modifiers. switch (TmpInst.getOpcode()) { case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand. lower_lea64_32mem(&TmpInst, 1); break; case X86::MOV16r0: TmpInst.setOpcode(X86::MOV32r0); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX16rr8: TmpInst.setOpcode(X86::MOVZX32rr8); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX16rm8: TmpInst.setOpcode(X86::MOVZX32rm8); lower_subreg32(&TmpInst, 0); break; case X86::MOVSX16rr8: TmpInst.setOpcode(X86::MOVSX32rr8); lower_subreg32(&TmpInst, 0); break; case X86::MOVSX16rm8: TmpInst.setOpcode(X86::MOVSX32rm8); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rr32: TmpInst.setOpcode(X86::MOV32rr); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rm32: TmpInst.setOpcode(X86::MOV32rm); lower_subreg32(&TmpInst, 0); break; case X86::MOV64ri64i32: TmpInst.setOpcode(X86::MOV32ri); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rr8: TmpInst.setOpcode(X86::MOVZX32rr8); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rm8: TmpInst.setOpcode(X86::MOVZX32rm8); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rr16: TmpInst.setOpcode(X86::MOVZX32rr16); lower_subreg32(&TmpInst, 0); break; case X86::MOVZX64rm16: TmpInst.setOpcode(X86::MOVZX32rm16); lower_subreg32(&TmpInst, 0); break; } printInstruction(&TmpInst); }