mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
6b92b8e50d
entry point of a function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27494 91177308-0d34-0410-b5e6-96231b3b80d8
299 lines
9.5 KiB
C++
Executable File
299 lines
9.5 KiB
C++
Executable File
//===-- 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 "llvm/Target/TargetOptions.h"
|
|
#include <iostream>
|
|
using namespace llvm;
|
|
|
|
/// runOnMachineFunction - This uses the printMachineInstruction()
|
|
/// method to print assembly for each instruction.
|
|
///
|
|
bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
|
|
// if (forDarwin) {
|
|
// Let PassManager know we need debug information and relay
|
|
// the MachineDebugInfo address on to DwarfWriter.
|
|
DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
|
|
// }
|
|
|
|
SetupMachineFunction(MF);
|
|
O << "\n\n";
|
|
|
|
// Print out constants referenced by the function
|
|
EmitConstantPool(MF.getConstantPool());
|
|
|
|
// Print out labels for the function.
|
|
const Function *F = MF.getFunction();
|
|
switch (F->getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case Function::InternalLinkage: // Symbols default to internal.
|
|
SwitchSection(".text", F);
|
|
EmitAlignment(4, F); // FIXME: This should be parameterized somewhere.
|
|
break;
|
|
case Function::ExternalLinkage:
|
|
SwitchSection(".text", F);
|
|
EmitAlignment(4, F); // FIXME: This should be parameterized somewhere.
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
break;
|
|
case Function::WeakLinkage:
|
|
case Function::LinkOnceLinkage:
|
|
if (forDarwin) {
|
|
SwitchSection(".section __TEXT,__textcoal_nt,coalesced,pure_instructions",
|
|
F);
|
|
O << "\t.globl\t" << CurrentFnName << "\n";
|
|
O << "\t.weak_definition\t" << CurrentFnName << "\n";
|
|
} else {
|
|
EmitAlignment(4, F); // FIXME: This should be parameterized somewhere.
|
|
O << "\t.section\t.llvm.linkonce.t." << CurrentFnName
|
|
<< ",\"ax\",@progbits\n";
|
|
O << "\t.weak " << CurrentFnName << "\n";
|
|
}
|
|
break;
|
|
}
|
|
O << CurrentFnName << ":\n";
|
|
|
|
if (forDarwin) {
|
|
// Emit pre-function debug information.
|
|
DW.BeginFunction(&MF);
|
|
}
|
|
|
|
// 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";
|
|
|
|
if (forDarwin) {
|
|
// Emit post-function debug information.
|
|
DW.EndFunction();
|
|
}
|
|
|
|
// 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:
|
|
if (!Modifier || strcmp(Modifier, "debug") != 0)
|
|
O << '$';
|
|
O << (int)MO.getImmedValue();
|
|
return;
|
|
case MachineOperand::MO_MachineBasicBlock: {
|
|
MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
|
|
O << PrivateGlobalPrefix << "BB"
|
|
<< Mang->getValueName(MBBOp->getParent()->getFunction())
|
|
<< "_" << MBBOp->getNumber () << "\t# "
|
|
<< MBBOp->getBasicBlock ()->getName ();
|
|
return;
|
|
}
|
|
case MachineOperand::MO_PCRelativeDisp:
|
|
std::cerr << "Shouldn't use addPCDisp() when building X86 MachineInstrs";
|
|
abort ();
|
|
return;
|
|
case MachineOperand::MO_ConstantPoolIndex: {
|
|
bool isMemOp = Modifier && !strcmp(Modifier, "mem");
|
|
if (!isMemOp) O << '$';
|
|
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
|
|
<< MO.getConstantPoolIndex();
|
|
if (forDarwin && TM.getRelocationModel() == Reloc::PIC)
|
|
O << "-\"L" << getFunctionNumber() << "$pb\"";
|
|
int Offset = MO.getOffset();
|
|
if (Offset > 0)
|
|
O << "+" << Offset;
|
|
else if (Offset < 0)
|
|
O << Offset;
|
|
return;
|
|
}
|
|
case MachineOperand::MO_GlobalAddress: {
|
|
bool isCallOp = Modifier && !strcmp(Modifier, "call");
|
|
bool isMemOp = Modifier && !strcmp(Modifier, "mem");
|
|
if (!isMemOp && !isCallOp) O << '$';
|
|
// Darwin block shameless ripped from PPCAsmPrinter.cpp
|
|
if (forDarwin && TM.getRelocationModel() != Reloc::Static) {
|
|
GlobalValue *GV = MO.getGlobal();
|
|
std::string Name = Mang->getValueName(GV);
|
|
// Link-once, External, or Weakly-linked global variables need
|
|
// non-lazily-resolved stubs
|
|
if (GV->isExternal() || GV->hasWeakLinkage() ||
|
|
GV->hasLinkOnceLinkage()) {
|
|
// Dynamically-resolved functions need a stub for the function.
|
|
if (isCallOp && isa<Function>(GV) && cast<Function>(GV)->isExternal()) {
|
|
FnStubs.insert(Name);
|
|
O << "L" << Name << "$stub";
|
|
} else {
|
|
GVStubs.insert(Name);
|
|
O << "L" << Name << "$non_lazy_ptr";
|
|
}
|
|
} else {
|
|
O << Mang->getValueName(GV);
|
|
}
|
|
if (!isCallOp && TM.getRelocationModel() == Reloc::PIC)
|
|
O << "-\"L" << getFunctionNumber() << "$pb\"";
|
|
} else
|
|
O << Mang->getValueName(MO.getGlobal());
|
|
int Offset = MO.getOffset();
|
|
if (Offset > 0)
|
|
O << "+" << Offset;
|
|
else if (Offset < 0)
|
|
O << Offset;
|
|
return;
|
|
}
|
|
case MachineOperand::MO_ExternalSymbol: {
|
|
bool isCallOp = Modifier && !strcmp(Modifier, "call");
|
|
if (isCallOp && forDarwin && TM.getRelocationModel() != Reloc::Static) {
|
|
std::string Name(GlobalPrefix);
|
|
Name += MO.getSymbolName();
|
|
FnStubs.insert(Name);
|
|
O << "L" << Name << "$stub";
|
|
return;
|
|
}
|
|
if (!isCallOp) O << '$';
|
|
O << GlobalPrefix << MO.getSymbolName();
|
|
return;
|
|
}
|
|
default:
|
|
O << "<unknown operand type>"; return;
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
|
|
unsigned char value = MI->getOperand(Op).getImmedValue();
|
|
assert(value <= 7 && "Invalid ssecc argument!");
|
|
switch (value) {
|
|
case 0: O << "eq"; break;
|
|
case 1: O << "lt"; break;
|
|
case 2: O << "le"; break;
|
|
case 3: O << "unord"; break;
|
|
case 4: O << "neq"; break;
|
|
case 5: O << "nlt"; break;
|
|
case 6: O << "nle"; break;
|
|
case 7: O << "ord"; break;
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op){
|
|
assert(isMem(MI, Op) && "Invalid memory reference!");
|
|
|
|
const MachineOperand &BaseReg = MI->getOperand(Op);
|
|
int ScaleVal = MI->getOperand(Op+1).getImmedValue();
|
|
const MachineOperand &IndexReg = MI->getOperand(Op+2);
|
|
const MachineOperand &DispSpec = MI->getOperand(Op+3);
|
|
|
|
if (BaseReg.isFrameIndex()) {
|
|
O << "[frame slot #" << BaseReg.getFrameIndex();
|
|
if (DispSpec.getImmedValue())
|
|
O << " + " << DispSpec.getImmedValue();
|
|
O << "]";
|
|
return;
|
|
}
|
|
|
|
if (DispSpec.isGlobalAddress() || DispSpec.isConstantPoolIndex()) {
|
|
printOperand(MI, Op+3, "mem");
|
|
} else {
|
|
int DispVal = DispSpec.getImmedValue();
|
|
if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
|
|
O << DispVal;
|
|
}
|
|
|
|
if (IndexReg.getReg() || BaseReg.getReg()) {
|
|
O << "(";
|
|
if (BaseReg.getReg())
|
|
printOperand(MI, Op);
|
|
|
|
if (IndexReg.getReg()) {
|
|
O << ",";
|
|
printOperand(MI, Op+2);
|
|
if (ScaleVal != 1)
|
|
O << "," << ScaleVal;
|
|
}
|
|
|
|
O << ")";
|
|
}
|
|
}
|
|
|
|
void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
|
|
O << "\"L" << getFunctionNumber() << "$pb\"\n";
|
|
O << "\"L" << getFunctionNumber() << "$pb\":";
|
|
}
|
|
|
|
/// 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"
|
|
|