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llvm-6502/lib/Target/Hexagon/HexagonAsmPrinter.cpp
Tony Linthicum b4b54153ad Hexagon backend support 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146412 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-12 21:14:40 +00:00

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//===-- HexagonAsmPrinter.cpp - Print machine instrs to Hexagon assembly ----=//
//
// The LLVM Compiler Infrastructure
//
// This file 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 Hexagon assembly language. This printer is
// the output mechanism used by `llc'.
//
// Documentation at http://developer.apple.com/documentation/DeveloperTools/
// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "Hexagon.h"
#include "HexagonTargetMachine.h"
#include "HexagonSubtarget.h"
#include "HexagonMachineFunctionInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static cl::opt<bool> AlignCalls(
"hexagon-align-calls", cl::Hidden, cl::init(true),
cl::desc("Insert falign after call instruction for Hexagon target"));
namespace {
class HexagonAsmPrinter : public AsmPrinter {
const HexagonSubtarget *Subtarget;
public:
explicit HexagonAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer) {
Subtarget = &TM.getSubtarget<HexagonSubtarget>();
}
virtual const char *getPassName() const {
return "Hexagon Assembly Printer";
}
/// printInstruction - This method is automatically generated by tablegen
/// from the instruction set description. This method returns true if the
/// machine instruction was sufficiently described to print it, otherwise it
void printInstruction(const MachineInstr *MI, raw_ostream &O);
virtual void EmitInstruction(const MachineInstr *MI);
void printOp(const MachineOperand &MO, raw_ostream &O);
/// printRegister - Print register according to target requirements.
///
void printRegister(const MachineOperand &MO, bool R0AsZero,
raw_ostream &O) {
unsigned RegNo = MO.getReg();
assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
O << getRegisterName(RegNo);
}
void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &OS) {
const MachineOperand &MO = MI->getOperand(OpNo);
if (MO.isReg()) {
printRegister(MO, false, OS);
} else if (MO.isImm()) {
OS << MO.getImm();
} else {
printOp(MO, OS);
}
}
bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &OS);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &OS);
void printHexagonImmOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
int value = MI->getOperand(OpNo).getImm();
O << value;
}
void printHexagonNegImmOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
int value = MI->getOperand(OpNo).getImm();
O << -value;
}
void printHexagonMEMriOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
const MachineOperand &MO1 = MI->getOperand(OpNo);
const MachineOperand &MO2 = MI->getOperand(OpNo+1);
O << getRegisterName(MO1.getReg())
<< " + #"
<< (int) MO2.getImm();
}
void printHexagonFrameIndexOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
const MachineOperand &MO1 = MI->getOperand(OpNo);
const MachineOperand &MO2 = MI->getOperand(OpNo+1);
O << getRegisterName(MO1.getReg())
<< ", #"
<< MO2.getImm();
}
void printBranchOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
// Branches can take an immediate operand. This is used by the branch
// selection pass to print $+8, an eight byte displacement from the PC.
if (MI->getOperand(OpNo).isImm()) {
O << "$+" << MI->getOperand(OpNo).getImm()*4;
} else {
printOp(MI->getOperand(OpNo), O);
}
}
void printCallOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
}
void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
}
void printSymbolHi(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
O << "#HI(";
if (MI->getOperand(OpNo).isImm()) {
printHexagonImmOperand(MI, OpNo, O);
} else {
printOp(MI->getOperand(OpNo), O);
}
O << ")";
}
void printSymbolLo(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
O << "#HI(";
if (MI->getOperand(OpNo).isImm()) {
printHexagonImmOperand(MI, OpNo, O);
} else {
printOp(MI->getOperand(OpNo), O);
}
O << ")";
}
void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O);
void printAddrModeBasePlusOffset(const MachineInstr *MI, int OpNo,
raw_ostream &O);
void printGlobalOperand(const MachineInstr *MI, int OpNo, raw_ostream &O);
void printJumpTable(const MachineInstr *MI, int OpNo, raw_ostream &O);
void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const;
static const char *getRegisterName(unsigned RegNo);
};
} // end of anonymous namespace
// Include the auto-generated portion of the assembly writer.
#include "HexagonGenAsmWriter.inc"
void HexagonAsmPrinter::EmitAlignment(unsigned NumBits,
const GlobalValue *GV) const {
// For basic block level alignment, use falign.
if (!GV) {
OutStreamer.EmitRawText(StringRef("\t.falign"));
return;
}
AsmPrinter::EmitAlignment(NumBits, GV);
}
void HexagonAsmPrinter::printOp(const MachineOperand &MO, raw_ostream &O) {
switch (MO.getType()) {
case MachineOperand::MO_Immediate:
dbgs() << "printOp() does not handle immediate values\n";
abort();
return;
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
return;
case MachineOperand::MO_JumpTableIndex:
O << *GetJTISymbol(MO.getIndex());
// FIXME: PIC relocation model.
return;
case MachineOperand::MO_ConstantPoolIndex:
O << *GetCPISymbol(MO.getIndex());
return;
case MachineOperand::MO_ExternalSymbol:
O << *GetExternalSymbolSymbol(MO.getSymbolName());
return;
case MachineOperand::MO_GlobalAddress: {
// Computing the address of a global symbol, not calling it.
O << *Mang->getSymbol(MO.getGlobal());
printOffset(MO.getOffset(), O);
return;
}
default:
O << "<unknown operand type: " << MO.getType() << ">";
return;
}
}
//
// isBlockOnlyReachableByFallthrough - We need to override this since the
// default AsmPrinter does not print labels for any basic block that
// is only reachable by a fall through. That works for all cases except
// for the case in which the basic block is reachable by a fall through but
// through an indirect from a jump table. In this case, the jump table
// will contain a label not defined by AsmPrinter.
//
bool HexagonAsmPrinter::
isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
if (MBB->hasAddressTaken()) {
return false;
}
return AsmPrinter::isBlockOnlyReachableByFallthrough(MBB);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool HexagonAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &OS) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'c': // Don't print "$" before a global var name or constant.
// Hexagon never has a prefix.
printOperand(MI, OpNo, OS);
return false;
case 'L': // Write second word of DImode reference.
// Verify that this operand has two consecutive registers.
if (!MI->getOperand(OpNo).isReg() ||
OpNo+1 == MI->getNumOperands() ||
!MI->getOperand(OpNo+1).isReg())
return true;
++OpNo; // Return the high-part.
break;
case 'I':
// Write 'i' if an integer constant, otherwise nothing. Used to print
// addi vs add, etc.
if (MI->getOperand(OpNo).isImm())
OS << "i";
return false;
}
}
printOperand(MI, OpNo, OS);
return false;
}
bool HexagonAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
const MachineOperand &Base = MI->getOperand(OpNo);
const MachineOperand &Offset = MI->getOperand(OpNo+1);
if (Base.isReg())
printOperand(MI, OpNo, O);
else
assert(0 && "Unimplemented");
if (Offset.isImm()) {
if (Offset.getImm())
O << " + #" << Offset.getImm();
}
else
assert(0 && "Unimplemented");
return false;
}
void HexagonAsmPrinter::printPredicateOperand(const MachineInstr *MI,
unsigned OpNo,
raw_ostream &O) {
assert(0 && "Unimplemented");
}
/// printMachineInstruction -- Print out a single Hexagon MI in Darwin syntax to
/// the current output stream.
///
void HexagonAsmPrinter::EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream O(Str);
const MachineFunction* MF = MI->getParent()->getParent();
const HexagonMachineFunctionInfo* MFI =
(const HexagonMachineFunctionInfo*)
MF->getInfo<HexagonMachineFunctionInfo>();
// Print a brace for the beginning of the packet.
if (MFI->isStartPacket(MI)) {
O << "\t{" << '\n';
}
DEBUG( O << "// MI = " << *MI << '\n';);
// Indent
O << "\t";
if (MI->getOpcode() == Hexagon::ENDLOOP0) {
if (MFI->isEndPacket(MI) && MFI->isStartPacket(MI)) {
O << "\t{ nop }";
} else {
O << "}";
}
printInstruction(MI, O);
} else if (MI->getOpcode() == Hexagon::STriwt) {
//
// Handle truncated store on Hexagon.
//
O << "\tmemw(";
printHexagonMEMriOperand(MI, 0, O);
O << ") = ";
unsigned SubRegNum =
TM.getRegisterInfo()->getSubReg(MI->getOperand(2)
.getReg(), Hexagon::subreg_loreg);
const char *SubRegName = getRegisterName(SubRegNum);
O << SubRegName << '\n';
} else if (MI->getOpcode() == Hexagon::MPYI_rin) {
// Handle multipy with -ve constant on Hexagon:
// "$dst =- mpyi($src1, #$src2)"
printOperand(MI, 0, O);
O << " =- mpyi(";
printOperand(MI, 1, O);
O << ", #";
printHexagonNegImmOperand(MI, 2, O);
O << ")";
} else if (MI->getOpcode() == Hexagon::MEMw_ADDSUBi_indexed_MEM_V4) {
//
// Handle memw(Rs+u6:2) [+-]= #U5
//
O << "\tmemw("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::MEMw_ADDSUBi_MEM_V4) {
//
// Handle memw(Rs+u6:2) [+-]= #U5
//
O << "\tmemw("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::MEMh_ADDSUBi_indexed_MEM_V4) {
//
// Handle memh(Rs+u6:1) [+-]= #U5
//
O << "\tmemh("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::MEMh_ADDSUBi_MEM_V4) {
//
// Handle memh(Rs+u6:1) [+-]= #U5
//
O << "\tmemh("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::MEMb_ADDSUBi_indexed_MEM_V4) {
//
// Handle memb(Rs+u6:1) [+-]= #U5
//
O << "\tmemb("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::MEMb_ADDSUBi_MEM_V4) {
//
// Handle memb(Rs+u6:1) [+-]= #U5
//
O << "\tmemb("; printHexagonMEMriOperand(MI, 0, O); O << ") ";
int addend = MI->getOperand(2).getImm();
if (addend < 0)
O << "-= " << "#" << -addend << '\n';
else
O << "+= " << "#" << addend << '\n';
} else if (MI->getOpcode() == Hexagon::CMPbGTri_V4) {
//
// Handle Pd=cmpb.gt(Rs,#s8)
//
O << "\t";
printRegister(MI->getOperand(0), false, O);
O << " = cmpb.gt(";
printRegister(MI->getOperand(1), false, O);
O << ", ";
int val = MI->getOperand(2).getImm() >> 24;
O << "#" << val << ")" << '\n';
} else if (MI->getOpcode() == Hexagon::CMPhEQri_V4) {
//
// Handle Pd=cmph.eq(Rs,#8)
//
O << "\t";
printRegister(MI->getOperand(0), false, O);
O << " = cmph.eq(";
printRegister(MI->getOperand(1), false, O);
O << ", ";
int val = MI->getOperand(2).getImm();
assert((((0 <= val) && (val <= 127)) ||
((65408 <= val) && (val <= 65535))) &&
"Not in correct range!");
if (val >= 65408) val -= 65536;
O << "#" << val << ")" << '\n';
} else if (MI->getOpcode() == Hexagon::CMPhGTri_V4) {
//
// Handle Pd=cmph.gt(Rs,#8)
//
O << "\t";
printRegister(MI->getOperand(0), false, O);
O << " = cmph.gt(";
printRegister(MI->getOperand(1), false, O);
O << ", ";
int val = MI->getOperand(2).getImm() >> 16;
O << "#" << val << ")" << '\n';
} else {
printInstruction(MI, O);
}
// Print a brace for the end of the packet.
if (MFI->isEndPacket(MI) && MI->getOpcode() != Hexagon::ENDLOOP0) {
O << "\n\t}" << '\n';
}
if (AlignCalls && MI->getDesc().isCall()) {
O << "\n\t.falign" << "\n";
}
OutStreamer.EmitRawText(O.str());
return;
}
/// PrintUnmangledNameSafely - Print out the printable characters in the name.
/// Don't print things like \n or \0.
// static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
// for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
// Name != E; ++Name)
// if (isprint(*Name))
// OS << *Name;
// }
void HexagonAsmPrinter::printAddrModeBasePlusOffset(const MachineInstr *MI,
int OpNo, raw_ostream &O) {
const MachineOperand &MO1 = MI->getOperand(OpNo);
const MachineOperand &MO2 = MI->getOperand(OpNo+1);
O << getRegisterName(MO1.getReg())
<< " + #"
<< MO2.getImm();
}
void HexagonAsmPrinter::printGlobalOperand(const MachineInstr *MI, int OpNo,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNo);
assert( (MO.getType() == MachineOperand::MO_GlobalAddress) &&
"Expecting global address");
O << *Mang->getSymbol(MO.getGlobal());
if (MO.getOffset() != 0) {
O << " + ";
O << MO.getOffset();
}
}
void HexagonAsmPrinter::printJumpTable(const MachineInstr *MI, int OpNo,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNo);
assert( (MO.getType() == MachineOperand::MO_JumpTableIndex) &&
"Expecting jump table index");
// Hexagon_TODO: Do we need name mangling?
O << *GetJTISymbol(MO.getIndex());
}
extern "C" void LLVMInitializeHexagonAsmPrinter() {
RegisterAsmPrinter<HexagonAsmPrinter> X(TheHexagonTarget);
}
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