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llvm-6502/lib/Target/ARM64/ARM64AsmPrinter.cpp
Tim Northover 7b837d8c75 ARM64: initial backend import 
This adds a second implementation of the AArch64 architecture to LLVM,
accessible in parallel via the "arm64" triple. The plan over the
coming weeks & months is to merge the two into a single backend,
during which time thorough code review should naturally occur.

Everything will be easier with the target in-tree though, hence this
commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205090 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-29 10:18:08 +00:00

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//===-- ARM64AsmPrinter.cpp - ARM64 LLVM assembly writer ------------------===//
//
// 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 the ARM64 assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "ARM64.h"
#include "ARM64MachineFunctionInfo.h"
#include "ARM64MCInstLower.h"
#include "ARM64RegisterInfo.h"
#include "InstPrinter/ARM64InstPrinter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/StackMaps.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCLinkerOptimizationHint.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
namespace {
class ARM64AsmPrinter : public AsmPrinter {
ARM64MCInstLower MCInstLowering;
StackMaps SM;
public:
ARM64AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), MCInstLowering(OutContext, *Mang, *this),
SM(*this), ARM64FI(NULL), LOHLabelCounter(0) {}
virtual const char *getPassName() const { return "ARM64 Assembly Printer"; }
/// \brief Wrapper for MCInstLowering.lowerOperand() for the
/// tblgen'erated pseudo lowering.
bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp) const {
return MCInstLowering.lowerOperand(MO, MCOp);
}
void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
const MachineInstr &MI);
void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
const MachineInstr &MI);
/// \brief tblgen'erated driver function for lowering simple MI->MC
/// pseudo instructions.
bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
const MachineInstr *MI);
void EmitInstruction(const MachineInstr *MI);
void getAnalysisUsage(AnalysisUsage &AU) const {
AsmPrinter::getAnalysisUsage(AU);
AU.setPreservesAll();
}
bool runOnMachineFunction(MachineFunction &F) {
ARM64FI = F.getInfo<ARM64FunctionInfo>();
return AsmPrinter::runOnMachineFunction(F);
}
private:
MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
void printOperand(const MachineInstr *MI, unsigned OpNum, raw_ostream &O);
bool printAsmMRegister(const MachineOperand &MO, char Mode, raw_ostream &O);
bool printAsmRegInClass(const MachineOperand &MO,
const TargetRegisterClass *RC, bool isVector,
raw_ostream &O);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
void EmitFunctionBodyEnd();
MCSymbol *GetCPISymbol(unsigned CPID) const;
void EmitEndOfAsmFile(Module &M);
ARM64FunctionInfo *ARM64FI;
/// \brief Emit the LOHs contained in ARM64FI.
void EmitLOHs();
typedef std::map<const MachineInstr *, MCSymbol *> MInstToMCSymbol;
MInstToMCSymbol LOHInstToLabel;
unsigned LOHLabelCounter;
};
} // end of anonymous namespace
//===----------------------------------------------------------------------===//
void ARM64AsmPrinter::EmitEndOfAsmFile(Module &M) {
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never
// generates code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
SM.serializeToStackMapSection();
}
MachineLocation
ARM64AsmPrinter::getDebugValueLocation(const MachineInstr *MI) const {
MachineLocation Location;
assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
// Frame address. Currently handles register +- offset only.
if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm())
Location.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
else {
DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
}
return Location;
}
void ARM64AsmPrinter::EmitLOHs() {
const ARM64FunctionInfo::MILOHDirectives &LOHs =
const_cast<const ARM64FunctionInfo *>(ARM64FI)
->getLOHContainer()
.getDirectives();
SmallVector<MCSymbol *, 3> MCArgs;
for (ARM64FunctionInfo::MILOHDirectives::const_iterator It = LOHs.begin(),
EndIt = LOHs.end();
It != EndIt; ++It) {
const ARM64FunctionInfo::MILOHArgs &MIArgs = It->getArgs();
for (ARM64FunctionInfo::MILOHArgs::const_iterator
MIArgsIt = MIArgs.begin(),
EndMIArgsIt = MIArgs.end();
MIArgsIt != EndMIArgsIt; ++MIArgsIt) {
MInstToMCSymbol::iterator LabelIt = LOHInstToLabel.find(*MIArgsIt);
assert(LabelIt != LOHInstToLabel.end() &&
"Label hasn't been inserted for LOH related instruction");
MCArgs.push_back(LabelIt->second);
}
OutStreamer.EmitLOHDirective(It->getKind(), MCArgs);
MCArgs.clear();
}
}
void ARM64AsmPrinter::EmitFunctionBodyEnd() {
if (!ARM64FI->getLOHRelated().empty())
EmitLOHs();
}
/// GetCPISymbol - Return the symbol for the specified constant pool entry.
MCSymbol *ARM64AsmPrinter::GetCPISymbol(unsigned CPID) const {
// Darwin uses a linker-private symbol name for constant-pools (to
// avoid addends on the relocation?), ELF has no such concept and
// uses a normal private symbol.
if (getDataLayout().getLinkerPrivateGlobalPrefix()[0])
return OutContext.GetOrCreateSymbol(
Twine(getDataLayout().getLinkerPrivateGlobalPrefix()) + "CPI" +
Twine(getFunctionNumber()) + "_" + Twine(CPID));
return OutContext.GetOrCreateSymbol(
Twine(getDataLayout().getPrivateGlobalPrefix()) + "CPI" +
Twine(getFunctionNumber()) + "_" + Twine(CPID));
}
void ARM64AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
default:
assert(0 && "<unknown operand type>");
case MachineOperand::MO_Register: {
unsigned Reg = MO.getReg();
assert(TargetRegisterInfo::isPhysicalRegister(Reg));
assert(!MO.getSubReg() && "Subregs should be eliminated!");
O << ARM64InstPrinter::getRegisterName(Reg);
break;
}
case MachineOperand::MO_Immediate: {
int64_t Imm = MO.getImm();
O << '#' << Imm;
break;
}
}
}
bool ARM64AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode,
raw_ostream &O) {
unsigned Reg = MO.getReg();
switch (Mode) {
default:
return true; // Unknown mode.
case 'w':
Reg = getWRegFromXReg(Reg);
break;
case 'x':
Reg = getXRegFromWReg(Reg);
break;
}
O << ARM64InstPrinter::getRegisterName(Reg);
return false;
}
// Prints the register in MO using class RC using the offset in the
// new register class. This should not be used for cross class
// printing.
bool ARM64AsmPrinter::printAsmRegInClass(const MachineOperand &MO,
const TargetRegisterClass *RC,
bool isVector, raw_ostream &O) {
assert(MO.isReg() && "Should only get here with a register!");
const ARM64RegisterInfo *RI =
static_cast<const ARM64RegisterInfo *>(TM.getRegisterInfo());
unsigned Reg = MO.getReg();
unsigned RegToPrint = RC->getRegister(RI->getEncodingValue(Reg));
assert(RI->regsOverlap(RegToPrint, Reg));
O << ARM64InstPrinter::getRegisterName(
RegToPrint, isVector ? ARM64::vreg : ARM64::NoRegAltName);
return false;
}
bool ARM64AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant,
const char *ExtraCode, raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNum);
// 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 'w': // Print W register
case 'x': // Print X register
if (MO.isReg())
return printAsmMRegister(MO, ExtraCode[0], O);
if (MO.isImm() && MO.getImm() == 0) {
unsigned Reg = ExtraCode[0] == 'w' ? ARM64::WZR : ARM64::XZR;
O << ARM64InstPrinter::getRegisterName(Reg);
return false;
}
printOperand(MI, OpNum, O);
return false;
case 'b': // Print B register.
case 'h': // Print H register.
case 's': // Print S register.
case 'd': // Print D register.
case 'q': // Print Q register.
if (MO.isReg()) {
const TargetRegisterClass *RC;
switch (ExtraCode[0]) {
case 'b':
RC = &ARM64::FPR8RegClass;
break;
case 'h':
RC = &ARM64::FPR16RegClass;
break;
case 's':
RC = &ARM64::FPR32RegClass;
break;
case 'd':
RC = &ARM64::FPR64RegClass;
break;
case 'q':
RC = &ARM64::FPR128RegClass;
break;
default:
return true;
}
return printAsmRegInClass(MO, RC, false /* vector */, O);
}
printOperand(MI, OpNum, O);
return false;
}
}
// According to ARM, we should emit x and v registers unless we have a
// modifier.
if (MO.isReg()) {
unsigned Reg = MO.getReg();
// If this is a w or x register, print an x register.
if (ARM64::GPR32allRegClass.contains(Reg) ||
ARM64::GPR64allRegClass.contains(Reg))
return printAsmMRegister(MO, 'x', O);
// If this is a b, h, s, d, or q register, print it as a v register.
return printAsmRegInClass(MO, &ARM64::FPR128RegClass, true /* vector */, O);
}
printOperand(MI, OpNum, O);
return false;
}
bool ARM64AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNum, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "[" << ARM64InstPrinter::getRegisterName(MO.getReg()) << "]";
return false;
}
void ARM64AsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
raw_ostream &OS) {
unsigned NOps = MI->getNumOperands();
assert(NOps == 4);
OS << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
// cast away const; DIetc do not take const operands for some reason.
DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps - 1).getMetadata()));
OS << V.getName();
OS << " <- ";
// Frame address. Currently handles register +- offset only.
assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
OS << '[';
printOperand(MI, 0, OS);
OS << '+';
printOperand(MI, 1, OS);
OS << ']';
OS << "+";
printOperand(MI, NOps - 2, OS);
}
void ARM64AsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
const MachineInstr &MI) {
unsigned NumNOPBytes = MI.getOperand(1).getImm();
SM.recordStackMap(MI);
// Emit padding.
assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
for (unsigned i = 0; i < NumNOPBytes; i += 4)
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::HINT).addImm(0));
}
// Lower a patchpoint of the form:
// [<def>], <id>, <numBytes>, <target>, <numArgs>
void ARM64AsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
const MachineInstr &MI) {
SM.recordPatchPoint(MI);
PatchPointOpers Opers(&MI);
int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
unsigned EncodedBytes = 0;
if (CallTarget) {
assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
"High 16 bits of call target should be zero.");
unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
EncodedBytes = 16;
// Materialize the jump address:
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::MOVZWi)
.addReg(ScratchReg)
.addImm((CallTarget >> 32) & 0xFFFF)
.addImm(32));
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::MOVKWi)
.addReg(ScratchReg)
.addReg(ScratchReg)
.addImm((CallTarget >> 16) & 0xFFFF)
.addImm(16));
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::MOVKWi)
.addReg(ScratchReg)
.addReg(ScratchReg)
.addImm(CallTarget & 0xFFFF)
.addImm(0));
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::BLR).addReg(ScratchReg));
}
// Emit padding.
unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
assert(NumBytes >= EncodedBytes &&
"Patchpoint can't request size less than the length of a call.");
assert((NumBytes - EncodedBytes) % 4 == 0 &&
"Invalid number of NOP bytes requested!");
for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
EmitToStreamer(OutStreamer, MCInstBuilder(ARM64::HINT).addImm(0));
}
// Simple pseudo-instructions have their lowering (with expansion to real
// instructions) auto-generated.
#include "ARM64GenMCPseudoLowering.inc"
static unsigned getRealIndexedOpcode(unsigned Opc) {
switch (Opc) {
case ARM64::LDRXpre_isel: return ARM64::LDRXpre;
case ARM64::LDRWpre_isel: return ARM64::LDRWpre;
case ARM64::LDRDpre_isel: return ARM64::LDRDpre;
case ARM64::LDRSpre_isel: return ARM64::LDRSpre;
case ARM64::LDRBBpre_isel: return ARM64::LDRBBpre;
case ARM64::LDRHHpre_isel: return ARM64::LDRHHpre;
case ARM64::LDRSBWpre_isel: return ARM64::LDRSBWpre;
case ARM64::LDRSBXpre_isel: return ARM64::LDRSBXpre;
case ARM64::LDRSHWpre_isel: return ARM64::LDRSHWpre;
case ARM64::LDRSHXpre_isel: return ARM64::LDRSHXpre;
case ARM64::LDRSWpre_isel: return ARM64::LDRSWpre;
case ARM64::LDRDpost_isel: return ARM64::LDRDpost;
case ARM64::LDRSpost_isel: return ARM64::LDRSpost;
case ARM64::LDRXpost_isel: return ARM64::LDRXpost;
case ARM64::LDRWpost_isel: return ARM64::LDRWpost;
case ARM64::LDRHHpost_isel: return ARM64::LDRHHpost;
case ARM64::LDRBBpost_isel: return ARM64::LDRBBpost;
case ARM64::LDRSWpost_isel: return ARM64::LDRSWpost;
case ARM64::LDRSHWpost_isel: return ARM64::LDRSHWpost;
case ARM64::LDRSHXpost_isel: return ARM64::LDRSHXpost;
case ARM64::LDRSBWpost_isel: return ARM64::LDRSBWpost;
case ARM64::LDRSBXpost_isel: return ARM64::LDRSBXpost;
case ARM64::STRXpre_isel: return ARM64::STRXpre;
case ARM64::STRWpre_isel: return ARM64::STRWpre;
case ARM64::STRHHpre_isel: return ARM64::STRHHpre;
case ARM64::STRBBpre_isel: return ARM64::STRBBpre;
case ARM64::STRDpre_isel: return ARM64::STRDpre;
case ARM64::STRSpre_isel: return ARM64::STRSpre;
}
llvm_unreachable("Unexpected pre-indexed opcode!");
}
void ARM64AsmPrinter::EmitInstruction(const MachineInstr *MI) {
// Do any auto-generated pseudo lowerings.
if (emitPseudoExpansionLowering(OutStreamer, MI))
return;
if (ARM64FI->getLOHRelated().count(MI)) {
// Generate a label for LOH related instruction
MCSymbol *LOHLabel = GetTempSymbol("loh", LOHLabelCounter++);
// Associate the instruction with the label
LOHInstToLabel[MI] = LOHLabel;
OutStreamer.EmitLabel(LOHLabel);
}
// Do any manual lowerings.
switch (MI->getOpcode()) {
default:
break;
case ARM64::DBG_VALUE: {
if (isVerbose() && OutStreamer.hasRawTextSupport()) {
SmallString<128> TmpStr;
raw_svector_ostream OS(TmpStr);
PrintDebugValueComment(MI, OS);
OutStreamer.EmitRawText(StringRef(OS.str()));
}
return;
}
// Indexed loads and stores use a pseudo to handle complex operand
// tricks and writeback to the base register. We strip off the writeback
// operand and switch the opcode here. Post-indexed stores were handled by the
// tablegen'erated pseudos above. (The complex operand <--> simple
// operand isel is beyond tablegen's ability, so we do these manually).
case ARM64::LDRHHpre_isel:
case ARM64::LDRBBpre_isel:
case ARM64::LDRXpre_isel:
case ARM64::LDRWpre_isel:
case ARM64::LDRDpre_isel:
case ARM64::LDRSpre_isel:
case ARM64::LDRSBWpre_isel:
case ARM64::LDRSBXpre_isel:
case ARM64::LDRSHWpre_isel:
case ARM64::LDRSHXpre_isel:
case ARM64::LDRSWpre_isel:
case ARM64::LDRDpost_isel:
case ARM64::LDRSpost_isel:
case ARM64::LDRXpost_isel:
case ARM64::LDRWpost_isel:
case ARM64::LDRHHpost_isel:
case ARM64::LDRBBpost_isel:
case ARM64::LDRSWpost_isel:
case ARM64::LDRSHWpost_isel:
case ARM64::LDRSHXpost_isel:
case ARM64::LDRSBWpost_isel:
case ARM64::LDRSBXpost_isel: {
MCInst TmpInst;
// For loads, the writeback operand to be skipped is the second.
TmpInst.setOpcode(getRealIndexedOpcode(MI->getOpcode()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(2).getReg()));
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(3).getImm()));
EmitToStreamer(OutStreamer, TmpInst);
return;
}
case ARM64::STRXpre_isel:
case ARM64::STRWpre_isel:
case ARM64::STRHHpre_isel:
case ARM64::STRBBpre_isel:
case ARM64::STRDpre_isel:
case ARM64::STRSpre_isel: {
MCInst TmpInst;
// For loads, the writeback operand to be skipped is the first.
TmpInst.setOpcode(getRealIndexedOpcode(MI->getOpcode()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(2).getReg()));
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(3).getImm()));
EmitToStreamer(OutStreamer, TmpInst);
return;
}
// Tail calls use pseudo instructions so they have the proper code-gen
// attributes (isCall, isReturn, etc.). We lower them to the real
// instruction here.
case ARM64::TCRETURNri: {
MCInst TmpInst;
TmpInst.setOpcode(ARM64::BR);
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
EmitToStreamer(OutStreamer, TmpInst);
return;
}
case ARM64::TCRETURNdi: {
MCOperand Dest;
MCInstLowering.lowerOperand(MI->getOperand(0), Dest);
MCInst TmpInst;
TmpInst.setOpcode(ARM64::B);
TmpInst.addOperand(Dest);
EmitToStreamer(OutStreamer, TmpInst);
return;
}
case ARM64::TLSDESC_BLR: {
MCOperand Callee, Sym;
MCInstLowering.lowerOperand(MI->getOperand(0), Callee);
MCInstLowering.lowerOperand(MI->getOperand(1), Sym);
// First emit a relocation-annotation. This expands to no code, but requests
// the following instruction gets an R_AARCH64_TLSDESC_CALL.
MCInst TLSDescCall;
TLSDescCall.setOpcode(ARM64::TLSDESCCALL);
TLSDescCall.addOperand(Sym);
EmitToStreamer(OutStreamer, TLSDescCall);
// Other than that it's just a normal indirect call to the function loaded
// from the descriptor.
MCInst BLR;
BLR.setOpcode(ARM64::BLR);
BLR.addOperand(Callee);
EmitToStreamer(OutStreamer, BLR);
return;
}
case TargetOpcode::STACKMAP:
return LowerSTACKMAP(OutStreamer, SM, *MI);
case TargetOpcode::PATCHPOINT:
return LowerPATCHPOINT(OutStreamer, SM, *MI);
}
// Finally, do the automated lowerings for everything else.
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
EmitToStreamer(OutStreamer, TmpInst);
}
// Force static initialization.
extern "C" void LLVMInitializeARM64AsmPrinter() {
RegisterAsmPrinter<ARM64AsmPrinter> X(TheARM64Target);
}
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