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//===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to Intel assembly ----===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to AT&T format assembly
// language. This printer is the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//
#include "X86ATTAsmPrinter.h"
#include "X86.h"
#include "X86TargetMachine.h"
#include "llvm/Module.h"
#include "llvm/Support/Mangler.h"
#include <iostream>
using namespace llvm;
using namespace x86;
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
///
bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SetupMachineFunction(MF);
O << "\n\n";
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
// Print out labels for the function.
SwitchSection("\t.text\n", MF.getFunction());
EmitAlignment(4); // FIXME: This should be parameterized somewhere.
if (!MF.getFunction()->hasInternalLinkage())
O << "\t.globl\t" << CurrentFnName << "\n";
if (HasDotTypeDotSizeDirective)
O << "\t.type\t" << CurrentFnName << ", @function\n";
O << CurrentFnName << ":\n";
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
if (I->pred_begin() != I->pred_end())
O << PrivateGlobalPrefix << "BB" << CurrentFnName << "_" << I->getNumber()
<< ":\t" << CommentString << " " << I->getBasicBlock()->getName()
<< "\n";
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
O << "\t";
printMachineInstruction(II);
}
}
if (HasDotTypeDotSizeDirective)
O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
// We didn't modify anything.
return false;
}
void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
const char *Modifier) {
const MachineOperand &MO = MI->getOperand(OpNo);
const MRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_VirtualRegister:
case MachineOperand::MO_MachineRegister:
assert(MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Virtual registers should not make it this far!");
O << '%';
for (const char *Name = RI.get(MO.getReg()).Name; *Name; ++Name)
O << (char)tolower(*Name);
return;
case MachineOperand::MO_SignExtendedImmed:
case MachineOperand::MO_UnextendedImmed:
O << '$' << (int)MO.getImmedValue();
return;
case MachineOperand::MO_MachineBasicBlock: {
MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
O << PrivateGlobalPrefix << "BB"
<< Mang->getValueName(MBBOp->getParent()->getFunction())
<< "_" << MBBOp->getNumber () << "\t# "
<< MBBOp->getBasicBlock ()->getName ();
return;
}
case MachineOperand::MO_PCRelativeDisp:
std::cerr << "Shouldn't use addPCDisp() when building X86 MachineInstrs";
abort ();
return;
case MachineOperand::MO_GlobalAddress: {
bool isCallOp = Modifier && !strcmp(Modifier, "call");
// Darwin block shameless ripped from PowerPCAsmPrinter.cpp
if (forDarwin) {
if (!isCallOp) O << '$';
GlobalValue *GV = MO.getGlobal();
std::string Name = Mang->getValueName(GV);
// Dynamically-resolved functions need a stub for the function. Be
// wary however not to output $stub for external functions whose addresses
// are taken. Those should be emitted as $non_lazy_ptr below.
Function *F = dyn_cast<Function>(GV);
if (F && isCallOp && F->isExternal()) {
FnStubs.insert(Name);
O << "L" << Name << "$stub";
} else if (GV->hasLinkOnceLinkage()) {
// Link-once, External, or Weakly-linked global variables need
// non-lazily-resolved stubs
LinkOnceStubs.insert(Name);
O << "L" << Name << "$non_lazy_ptr";
} else if (GV->isExternal() || GV->hasWeakLinkage()) {
GVStubs.insert(Name);
O << "L" << Name << "$non_lazy_ptr";
} else {
O << Mang->getValueName(GV);
}
int Offset = MO.getOffset();
if (Offset > 0)
O << "+" << Offset;
else if (Offset < 0)
O << Offset;
return;
}
if (!isCallOp) O << '$';
O << Mang->getValueName(MO.getGlobal());
int Offset = MO.getOffset();
if (Offset > 0)
O << "+" << Offset;
else if (Offset < 0)
O << Offset;
return;
}
case MachineOperand::MO_ExternalSymbol: {
bool isCallOp = Modifier && !strcmp(Modifier, "call");
if (isCallOp && forDarwin) {
std::string Name(GlobalPrefix); Name += MO.getSymbolName();
FnStubs.insert(Name);
O << "L" << Name << "$stub";
return;
}
if (!isCallOp) O << '$';
O << GlobalPrefix << MO.getSymbolName();
return;
}
default:
O << "<unknown operand type>"; return;
}
}
void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
unsigned char value = MI->getOperand(Op).getImmedValue();
assert(value <= 7 && "Invalid ssecc argument!");
switch (value) {
case 0: O << "eq"; break;
case 1: O << "lt"; break;
case 2: O << "le"; break;
case 3: O << "unord"; break;
case 4: O << "neq"; break;
case 5: O << "nlt"; break;
case 6: O << "nle"; break;
case 7: O << "ord"; break;
}
}
void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
assert(isMem(MI, Op) && "Invalid memory reference!");
const MachineOperand &BaseReg = MI->getOperand(Op);
int ScaleVal = MI->getOperand(Op+1).getImmedValue();
const MachineOperand &IndexReg = MI->getOperand(Op+2);
const MachineOperand &DispSpec = MI->getOperand(Op+3);
if (BaseReg.isFrameIndex()) {
O << "[frame slot #" << BaseReg.getFrameIndex();
if (DispSpec.getImmedValue())
O << " + " << DispSpec.getImmedValue();
O << "]";
return;
} else if (BaseReg.isConstantPoolIndex()) {
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
<< BaseReg.getConstantPoolIndex();
if (DispSpec.getImmedValue())
O << "+" << DispSpec.getImmedValue();
if (IndexReg.getReg()) {
O << "(,";
printOperand(MI, Op+2);
if (ScaleVal != 1)
O << "," << ScaleVal;
O << ")";
}
return;
}
if (DispSpec.isGlobalAddress()) {
printOperand(MI, Op+3, "call");
} else {
int DispVal = DispSpec.getImmedValue();
if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
O << DispVal;
}
if (IndexReg.getReg() || BaseReg.getReg()) {
O << "(";
if (BaseReg.getReg())
printOperand(MI, Op);
if (IndexReg.getReg()) {
O << ",";
printOperand(MI, Op+2);
if (ScaleVal != 1)
O << "," << ScaleVal;
}
O << ")";
}
}
/// printMachineInstruction -- Print out a single X86 LLVM instruction
/// MI in Intel syntax to the current output stream.
///
void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// This works around some Darwin assembler bugs.
if (forDarwin) {
switch (MI->getOpcode()) {
case X86::REP_MOVSB:
O << "rep/movsb (%esi),(%edi)\n";
return;
case X86::REP_MOVSD:
O << "rep/movsl (%esi),(%edi)\n";
return;
case X86::REP_MOVSW:
O << "rep/movsw (%esi),(%edi)\n";
return;
case X86::REP_STOSB:
O << "rep/stosb\n";
return;
case X86::REP_STOSD:
O << "rep/stosl\n";
return;
case X86::REP_STOSW:
O << "rep/stosw\n";
return;
default:
break;
}
}
// Call the autogenerated instruction printer routines.
printInstruction(MI);
}
// Include the auto-generated portion of the assembly writer.
#include "X86GenAsmWriter.inc"
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