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split MachineInstr -> MCInst lowering into its own class (not

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being embedded into X86ATTAsmPrinter).  This still depends heavily
on X86ATTAsmPrinter, but this is a step in the right direction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81627 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-12 20:34:57 +00:00
parent 4e68a2a632
commit 8fea32f9ff
3 changed files with 215 additions and 151 deletions
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8
lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
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@ -45,6 +45,8 @@ class VISIBILITY_HIDDEN X86ATTAsmPrinter : public AsmPrinter {
virtual const char *getPassName() const {
return "X86 AT&T-Style Assembly Printer";
}
const X86Subtarget &getSubtarget() const { return *Subtarget; }
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
@ -64,12 +66,6 @@ class VISIBILITY_HIDDEN X86ATTAsmPrinter : public AsmPrinter {
// New MCInst printing stuff.
void printInstruction(const MCInst *MI);
MCSymbol *GetPICBaseSymbol();
MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO);
MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO);
MCSymbol *GetJumpTableSymbol(const MachineOperand &MO);
MCSymbol *GetConstantPoolIndexSymbol(const MachineOperand &MO);
MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym);
virtual void printMCInst(const MCInst *MI) { printInstruction(MI); }

309
lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
View File

@ -12,7 +12,7 @@
//
//===----------------------------------------------------------------------===//
#include "X86MCInstLower.h"
#include "X86ATTAsmPrinter.h"
#include "X86MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
@ -24,24 +24,32 @@
#include "llvm/ADT/SmallString.h"
using namespace llvm;
MCSymbol *X86ATTAsmPrinter::GetPICBaseSymbol() {
const X86Subtarget &X86MCInstLower::getSubtarget() const {
return AsmPrinter.getSubtarget();
}
MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
// 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() << "$pb";
if (getSubtarget().isTargetDarwin()) {
raw_svector_ostream(Name) << 'L' << AsmPrinter.getFunctionNumber() << "$pb";
} else {
assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
raw_svector_ostream(Name) << ".Lllvm$" << getFunctionNumber()<<".$piclabel";
assert(getSubtarget().isTargetELF() && "Don't know how to print PIC label!");
raw_svector_ostream(Name) << ".Lllvm$" << AsmPrinter.getFunctionNumber()
<< ".$piclabel";
}
return OutContext.GetOrCreateSymbol(Name.str());
return Ctx.GetOrCreateSymbol(Name.str());
}
/// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
/// MCOperand.
MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
MCSymbol *X86MCInstLower::
GetGlobalAddressSymbol(const MachineOperand &MO) const {
const GlobalValue *GV = MO.getGlobal();
bool isImplicitlyPrivate = false;
@ -54,8 +62,8 @@ MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
if (Subtarget->isTargetCygMing())
DecorateCygMingName(Name, GV);
if (getSubtarget().isTargetCygMing())
AsmPrinter.DecorateCygMingName(Name, GV);
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
@ -72,35 +80,34 @@ MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
case X86II::MO_DARWIN_NONLAZY:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
Name += "$non_lazy_ptr";
MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = GVStubs[Sym];
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = AsmPrinter.GVStubs[Sym];
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = OutContext.GetOrCreateSymbol(Name.str());
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
Name += "$non_lazy_ptr";
MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = HiddenGVStubs[Sym];
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = AsmPrinter.HiddenGVStubs[Sym];
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = OutContext.GetOrCreateSymbol(Name.str());
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
case X86II::MO_DARWIN_STUB: {
Name += "$stub";
MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = FnStubs[Sym];
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = OutContext.GetOrCreateSymbol(Name.str());
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
@ -116,12 +123,13 @@ MCSymbol *X86ATTAsmPrinter::GetGlobalAddressSymbol(const MachineOperand &MO) {
case X86II::MO_PLT: Name += "@PLT"; break;
}
return OutContext.GetOrCreateSymbol(Name.str());
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
MCSymbol *X86MCInstLower::
GetExternalSymbolSymbol(const MachineOperand &MO) const {
SmallString<128> Name;
Name += MAI->getGlobalPrefix();
Name += AsmPrinter.MAI->getGlobalPrefix();
Name += MO.getSymbolName();
switch (MO.getTargetFlags()) {
@ -138,11 +146,11 @@ MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
}
case X86II::MO_DARWIN_STUB: {
Name += "$stub";
MCSymbol *Sym = OutContext.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = FnStubs[Sym];
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MCSymbol *&StubSym = AsmPrinter.FnStubs[Sym];
if (StubSym == 0) {
Name.erase(Name.end()-5, Name.end());
StubSym = OutContext.GetOrCreateSymbol(Name.str());
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
@ -158,13 +166,13 @@ MCSymbol *X86ATTAsmPrinter::GetExternalSymbolSymbol(const MachineOperand &MO) {
case X86II::MO_PLT: Name += "@PLT"; break;
}
return OutContext.GetOrCreateSymbol(Name.str());
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << MO.getIndex();
raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
<< AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
switch (MO.getTargetFlags()) {
default:
@ -187,15 +195,15 @@ MCSymbol *X86ATTAsmPrinter::GetJumpTableSymbol(const MachineOperand &MO) {
}
// Create a symbol for the name.
return OutContext.GetOrCreateSymbol(Name.str());
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86ATTAsmPrinter::
GetConstantPoolIndexSymbol(const MachineOperand &MO) {
MCSymbol *X86MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
<< getFunctionNumber() << '_' << MO.getIndex();
raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
<< AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
switch (MO.getTargetFlags()) {
default:
@ -218,14 +226,14 @@ GetConstantPoolIndexSymbol(const MachineOperand &MO) {
}
// Create a symbol for the name.
return OutContext.GetOrCreateSymbol(Name.str());
return Ctx.GetOrCreateSymbol(Name.str());
}
MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) {
MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) const {
// 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);
const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
@ -251,8 +259,8 @@ MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
// Subtract the pic base.
Expr = MCBinaryExpr::CreateSub(Expr,
MCSymbolRefExpr::Create(GetPICBaseSymbol(),
OutContext),
OutContext);
Ctx),
Ctx);
break;
case X86II::MO_GOT_ABSOLUTE_ADDRESS: {
// For this, we want to print something like:
@ -260,24 +268,25 @@ MCOperand X86ATTAsmPrinter::LowerSymbolOperand(const MachineOperand &MO,
// 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);
raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix()
<< "picbaseref" << AsmPrinter.getFunctionNumber();
MCSymbol *DotSym = Ctx.GetOrCreateSymbol(Name.str());
// FIXME: This instruction should be lowered before we get here...
AsmPrinter.OutStreamer.EmitLabel(DotSym);
const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, Ctx);
const MCExpr *PICBase = MCSymbolRefExpr::Create(GetPICBaseSymbol(),
OutContext);
DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, OutContext);
Ctx);
DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, Ctx);
Expr = MCBinaryExpr::CreateAdd(Expr, DotExpr, Ctx);
break;
}
}
if (!MO.isJTI() && MO.getOffset())
Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(),
OutContext),
OutContext);
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(MO.getOffset(), Ctx),
Ctx);
return MCOperand::CreateExpr(Expr);
}
@ -303,9 +312,107 @@ static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
}
void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
OutMI.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:
MI->dump();
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
MCOp = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_MachineBasicBlock:
// FIXME: Kill MBBLabel operand type!
MCOp = MCOperand::CreateMBBLabel(AsmPrinter.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;
}
OutMI.addOperand(MCOp);
}
// Handle a few special cases to eliminate operand modifiers.
switch (OutMI.getOpcode()) {
case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
lower_lea64_32mem(&OutMI, 1);
break;
case X86::MOV16r0:
OutMI.setOpcode(X86::MOV32r0);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX16rr8:
OutMI.setOpcode(X86::MOVZX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX16rm8:
OutMI.setOpcode(X86::MOVZX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVSX16rr8:
OutMI.setOpcode(X86::MOVSX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVSX16rm8:
OutMI.setOpcode(X86::MOVSX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr32:
OutMI.setOpcode(X86::MOV32rr);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm32:
OutMI.setOpcode(X86::MOV32rm);
lower_subreg32(&OutMI, 0);
break;
case X86::MOV64ri64i32:
OutMI.setOpcode(X86::MOV32ri);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr8:
OutMI.setOpcode(X86::MOVZX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm8:
OutMI.setOpcode(X86::MOVZX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr16:
OutMI.setOpcode(X86::MOVZX32rr16);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm16:
OutMI.setOpcode(X86::MOVZX32rm16);
lower_subreg32(&OutMI, 0);
break;
}
}
void X86ATTAsmPrinter::
printInstructionThroughMCStreamer(const MachineInstr *MI) {
MCInst TmpInst;
X86MCInstLower MCInstLowering(OutContext, Mang, *this);
switch (MI->getOpcode()) {
case TargetInstrInfo::DBG_LABEL:
case TargetInstrInfo::EH_LABEL:
@ -320,6 +427,7 @@ printInstructionThroughMCStreamer(const MachineInstr *MI) {
printImplicitDef(MI);
return;
case X86::MOVPC32r: {
MCInst TmpInst;
// This is a pseudo op for a two instruction sequence with a label, which
// looks like:
// call "L1$pb"
@ -327,7 +435,7 @@ printInstructionThroughMCStreamer(const MachineInstr *MI) {
// popl %esi
// Emit the call.
MCSymbol *PICBase = GetPICBaseSymbol();
MCSymbol *PICBase = MCInstLowering.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.
@ -347,98 +455,9 @@ printInstructionThroughMCStreamer(const MachineInstr *MI) {
}
}
TmpInst.setOpcode(MI->getOpcode());
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
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);
}

49
lib/Target/X86/AsmPrinter/X86MCInstLower.h Normal file
View File

@ -0,0 +1,49 @@
//===-- X86MCInstLower.h - Lower MachineInstr to MCInst -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef X86_MCINSTLOWER_H
#define X86_MCINSTLOWER_H
namespace llvm {
class MCContext;
class MCInst;
class MCOperand;
class MCSymbol;
class MachineInstr;
class MachineOperand;
class Mangler;
class X86ATTAsmPrinter;
class X86Subtarget;
class X86MCInstLower {
MCContext &Ctx;
Mangler *Mang;
X86ATTAsmPrinter &AsmPrinter;
public:
X86MCInstLower(MCContext &ctx, Mangler *mang, X86ATTAsmPrinter &asmprinter)
: Ctx(ctx), Mang(mang), AsmPrinter(asmprinter) {}
void Lower(const MachineInstr *MI, MCInst &OutMI) const;
MCSymbol *GetPICBaseSymbol() const;
private:
const X86Subtarget &getSubtarget() const;
MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
MCSymbol *GetJumpTableSymbol(const MachineOperand &MO) const;
MCSymbol *GetConstantPoolIndexSymbol(const MachineOperand &MO) const;
MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
};
}
#endif