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//===-- CSKYAsmPrinter.cpp - CSKY LLVM assembly writer --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to the CSKY assembly language.
//
//===----------------------------------------------------------------------===//
#include "CSKYAsmPrinter.h"
#include "CSKY.h"
#include "CSKYConstantPoolValue.h"
#include "CSKYTargetMachine.h"
#include "MCTargetDesc/CSKYInstPrinter.h"
#include "MCTargetDesc/CSKYMCExpr.h"
#include "TargetInfo/CSKYTargetInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/TargetRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "csky-asm-printer"
STATISTIC(CSKYNumInstrsCompressed,
"Number of C-SKY Compressed instructions emitted");
CSKYAsmPrinter::CSKYAsmPrinter(llvm::TargetMachine &TM,
std::unique_ptr<llvm::MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)), MCInstLowering(OutContext, *this) {}
bool CSKYAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
MCP = MF.getConstantPool();
Subtarget = &MF.getSubtarget<CSKYSubtarget>();
return AsmPrinter::runOnMachineFunction(MF);
}
#define GEN_COMPRESS_INSTR
#include "CSKYGenCompressInstEmitter.inc"
void CSKYAsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
MCInst CInst;
bool Res = compressInst(CInst, Inst, *Subtarget, OutStreamer->getContext());
if (Res)
++CSKYNumInstrsCompressed;
AsmPrinter::EmitToStreamer(*OutStreamer, Res ? CInst : Inst);
}
// Simple pseudo-instructions have their lowering (with expansion to real
// instructions) auto-generated.
#include "CSKYGenMCPseudoLowering.inc"
void CSKYAsmPrinter::expandTLSLA(const MachineInstr *MI) {
const CSKYInstrInfo *TII = Subtarget->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
MCSymbol *PCLabel = OutContext.getOrCreateSymbol(
Twine(MAI->getPrivateGlobalPrefix()) + "PC" + Twine(getFunctionNumber()) +
"_" + Twine(MI->getOperand(3).getImm()));
OutStreamer->emitLabel(PCLabel);
auto Instr = BuildMI(*MF, DL, TII->get(CSKY::LRW32))
.add(MI->getOperand(0))
.add(MI->getOperand(2));
MCInst LRWInst;
MCInstLowering.Lower(Instr, LRWInst);
EmitToStreamer(*OutStreamer, LRWInst);
Instr = BuildMI(*MF, DL, TII->get(CSKY::GRS32))
.add(MI->getOperand(1))
.addSym(PCLabel);
MCInst GRSInst;
MCInstLowering.Lower(Instr, GRSInst);
EmitToStreamer(*OutStreamer, GRSInst);
return;
}
void CSKYAsmPrinter::emitCustomConstantPool(const MachineInstr *MI) {
// This instruction represents a floating constant pool in the function.
// The first operand is the ID# for this instruction, the second is the
// index into the MachineConstantPool that this is, the third is the size
// in bytes of this constant pool entry.
// The required alignment is specified on the basic block holding this MI.
unsigned LabelId = (unsigned)MI->getOperand(0).getImm();
unsigned CPIdx = (unsigned)MI->getOperand(1).getIndex();
// If this is the first entry of the pool, mark it.
if (!InConstantPool) {
OutStreamer->emitValueToAlignment(4);
InConstantPool = true;
}
OutStreamer->emitLabel(GetCPISymbol(LabelId));
const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPIdx];
if (MCPE.isMachineConstantPoolEntry())
emitMachineConstantPoolValue(MCPE.Val.MachineCPVal);
else
emitGlobalConstant(MF->getDataLayout(), MCPE.Val.ConstVal);
return;
}
void CSKYAsmPrinter::emitFunctionBodyEnd() {
// Make sure to terminate any constant pools that were at the end
// of the function.
if (!InConstantPool)
return;
InConstantPool = false;
}
void CSKYAsmPrinter::emitInstruction(const MachineInstr *MI) {
// Do any auto-generated pseudo lowerings.
if (emitPseudoExpansionLowering(*OutStreamer, MI))
return;
// If we just ended a constant pool, mark it as such.
if (InConstantPool && MI->getOpcode() != CSKY::CONSTPOOL_ENTRY) {
InConstantPool = false;
}
if (MI->getOpcode() == CSKY::PseudoTLSLA32)
return expandTLSLA(MI);
if (MI->getOpcode() == CSKY::CONSTPOOL_ENTRY)
return emitCustomConstantPool(MI);
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
EmitToStreamer(*OutStreamer, TmpInst);
}
// Convert a CSKY-specific constant pool modifier into the associated
// MCSymbolRefExpr variant kind.
static CSKYMCExpr::VariantKind
getModifierVariantKind(CSKYCP::CSKYCPModifier Modifier) {
switch (Modifier) {
case CSKYCP::NO_MOD:
return CSKYMCExpr::VK_CSKY_None;
case CSKYCP::ADDR:
return CSKYMCExpr::VK_CSKY_ADDR;
case CSKYCP::GOT:
return CSKYMCExpr::VK_CSKY_GOT;
case CSKYCP::GOTOFF:
return CSKYMCExpr::VK_CSKY_GOTOFF;
case CSKYCP::PLT:
return CSKYMCExpr::VK_CSKY_PLT;
case CSKYCP::TLSGD:
return CSKYMCExpr::VK_CSKY_TLSGD;
case CSKYCP::TLSLE:
return CSKYMCExpr::VK_CSKY_TLSLE;
case CSKYCP::TLSIE:
return CSKYMCExpr::VK_CSKY_TLSIE;
}
llvm_unreachable("Invalid CSKYCPModifier!");
}
void CSKYAsmPrinter::emitMachineConstantPoolValue(
MachineConstantPoolValue *MCPV) {
int Size = getDataLayout().getTypeAllocSize(MCPV->getType());
CSKYConstantPoolValue *CCPV = static_cast<CSKYConstantPoolValue *>(MCPV);
MCSymbol *MCSym;
if (CCPV->isBlockAddress()) {
const BlockAddress *BA =
cast<CSKYConstantPoolConstant>(CCPV)->getBlockAddress();
MCSym = GetBlockAddressSymbol(BA);
} else if (CCPV->isGlobalValue()) {
const GlobalValue *GV = cast<CSKYConstantPoolConstant>(CCPV)->getGV();
MCSym = getSymbol(GV);
} else if (CCPV->isMachineBasicBlock()) {
const MachineBasicBlock *MBB = cast<CSKYConstantPoolMBB>(CCPV)->getMBB();
MCSym = MBB->getSymbol();
} else if (CCPV->isJT()) {
signed JTI = cast<CSKYConstantPoolJT>(CCPV)->getJTI();
MCSym = GetJTISymbol(JTI);
} else {
assert(CCPV->isExtSymbol() && "unrecognized constant pool value");
StringRef Sym = cast<CSKYConstantPoolSymbol>(CCPV)->getSymbol();
MCSym = GetExternalSymbolSymbol(Sym);
}
// Create an MCSymbol for the reference.
const MCExpr *Expr =
MCSymbolRefExpr::create(MCSym, MCSymbolRefExpr::VK_None, OutContext);
if (CCPV->getPCAdjustment()) {
MCSymbol *PCLabel = OutContext.getOrCreateSymbol(
Twine(MAI->getPrivateGlobalPrefix()) + "PC" +
Twine(getFunctionNumber()) + "_" + Twine(CCPV->getLabelID()));
const MCExpr *PCRelExpr = MCSymbolRefExpr::create(PCLabel, OutContext);
if (CCPV->mustAddCurrentAddress()) {
// We want "(<expr> - .)", but MC doesn't have a concept of the '.'
// label, so just emit a local label end reference that instead.
MCSymbol *DotSym = OutContext.createTempSymbol();
OutStreamer->emitLabel(DotSym);
const MCExpr *DotExpr = MCSymbolRefExpr::create(DotSym, OutContext);
PCRelExpr = MCBinaryExpr::createSub(PCRelExpr, DotExpr, OutContext);
}
Expr = MCBinaryExpr::createSub(Expr, PCRelExpr, OutContext);
}
// Create an MCSymbol for the reference.
Expr = CSKYMCExpr::create(Expr, getModifierVariantKind(CCPV->getModifier()),
OutContext);
OutStreamer->emitValue(Expr, Size);
}
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeCSKYAsmPrinter() {
RegisterAsmPrinter<CSKYAsmPrinter> X(getTheCSKYTarget());
}
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