Imported Upstream version 5.18.0.207

Former-commit-id: 3b152f462918d427ce18620a2cbe4f8b79650449

external/llvm/lib/MC/MCWasmStreamer.cpp

@@ -1,232 +0,0 @@
-//===- lib/MC/MCWasmStreamer.cpp - Wasm Object Output ---------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file assembles .s files and emits Wasm .o object files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/MC/MCWasmStreamer.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/MC/MCAsmBackend.h"
-#include "llvm/MC/MCAsmLayout.h"
-#include "llvm/MC/MCAssembler.h"
-#include "llvm/MC/MCCodeEmitter.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCInst.h"
-#include "llvm/MC/MCObjectStreamer.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSectionWasm.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCSymbolWasm.h"
-#include "llvm/MC/MCValue.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace llvm;
-
-MCWasmStreamer::~MCWasmStreamer() {}
-
-void MCWasmStreamer::mergeFragment(MCDataFragment *DF, MCDataFragment *EF) {
-  flushPendingLabels(DF, DF->getContents().size());
-
-  for (unsigned i = 0, e = EF->getFixups().size(); i != e; ++i) {
-    EF->getFixups()[i].setOffset(EF->getFixups()[i].getOffset() +
-                                 DF->getContents().size());
-    DF->getFixups().push_back(EF->getFixups()[i]);
-  }
-  DF->setHasInstructions(true);
-  DF->getContents().append(EF->getContents().begin(), EF->getContents().end());
-}
-
-void MCWasmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
-  // Let the target do whatever target specific stuff it needs to do.
-  getAssembler().getBackend().handleAssemblerFlag(Flag);
-
-  // Do any generic stuff we need to do.
-  llvm_unreachable("invalid assembler flag!");
-}
-
-void MCWasmStreamer::ChangeSection(MCSection *Section,
-                                   const MCExpr *Subsection) {
-  MCAssembler &Asm = getAssembler();
-  auto *SectionWasm = static_cast<const MCSectionWasm *>(Section);
-  const MCSymbol *Grp = SectionWasm->getGroup();
-  if (Grp)
-    Asm.registerSymbol(*Grp);
-
-  this->MCObjectStreamer::ChangeSection(Section, Subsection);
-}
-
-void MCWasmStreamer::EmitWeakReference(MCSymbol *Alias,
-                                       const MCSymbol *Symbol) {
-  getAssembler().registerSymbol(*Symbol);
-  const MCExpr *Value = MCSymbolRefExpr::create(
-      Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext());
-  Alias->setVariableValue(Value);
-}
-
-bool MCWasmStreamer::EmitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
-  assert(Attribute != MCSA_IndirectSymbol && "indirect symbols not supported");
-
-  auto *Symbol = cast<MCSymbolWasm>(S);
-
-  // Adding a symbol attribute always introduces the symbol, note that an
-  // important side effect of calling registerSymbol here is to register
-  // the symbol with the assembler.
-  getAssembler().registerSymbol(*Symbol);
-
-  switch (Attribute) {
-  case MCSA_LazyReference:
-  case MCSA_Reference:
-  case MCSA_SymbolResolver:
-  case MCSA_PrivateExtern:
-  case MCSA_WeakDefinition:
-  case MCSA_WeakDefAutoPrivate:
-  case MCSA_Invalid:
-  case MCSA_IndirectSymbol:
-  case MCSA_Protected:
-    return false;
-
-  case MCSA_Hidden:
-    Symbol->setHidden(true);
-    break;
-
-  case MCSA_Weak:
-  case MCSA_WeakReference:
-    Symbol->setWeak(true);
-    Symbol->setExternal(true);
-    break;
-
-  case MCSA_Global:
-    Symbol->setExternal(true);
-    break;
-
-  case MCSA_ELF_TypeFunction:
-    Symbol->setIsFunction(true);
-    break;
-
-  case MCSA_ELF_TypeObject:
-    Symbol->setIsFunction(false);
-    break;
-
-  default:
-    // unrecognized directive
-    llvm_unreachable("unexpected MCSymbolAttr");
-    return false;
-  }
-
-  return true;
-}
-
-void MCWasmStreamer::EmitCommonSymbol(MCSymbol *S, uint64_t Size,
-                                      unsigned ByteAlignment) {
-  llvm_unreachable("Common symbols are not yet implemented for Wasm");
-}
-
-void MCWasmStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
-  cast<MCSymbolWasm>(Symbol)->setSize(Value);
-}
-
-void MCWasmStreamer::EmitLocalCommonSymbol(MCSymbol *S, uint64_t Size,
-                                           unsigned ByteAlignment) {
-  llvm_unreachable("Local common symbols are not yet implemented for Wasm");
-}
-
-void MCWasmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
-                                   SMLoc Loc) {
-  MCObjectStreamer::EmitValueImpl(Value, Size, Loc);
-}
-
-void MCWasmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
-                                          unsigned ValueSize,
-                                          unsigned MaxBytesToEmit) {
-  MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value, ValueSize,
-                                         MaxBytesToEmit);
-}
-
-void MCWasmStreamer::EmitIdent(StringRef IdentString) {
-  MCSection *Comment = getAssembler().getContext().getWasmSection(
-      ".comment", SectionKind::getMetadata());
-  PushSection();
-  SwitchSection(Comment);
-  if (!SeenIdent) {
-    EmitIntValue(0, 1);
-    SeenIdent = true;
-  }
-  EmitBytes(IdentString);
-  EmitIntValue(0, 1);
-  PopSection();
-}
-
-void MCWasmStreamer::EmitInstToFragment(const MCInst &Inst,
-                                        const MCSubtargetInfo &STI) {
-  this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
-}
-
-void MCWasmStreamer::EmitInstToData(const MCInst &Inst,
-                                    const MCSubtargetInfo &STI) {
-  MCAssembler &Assembler = getAssembler();
-  SmallVector<MCFixup, 4> Fixups;
-  SmallString<256> Code;
-  raw_svector_ostream VecOS(Code);
-  Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
-
-  // Append the encoded instruction to the current data fragment (or create a
-  // new such fragment if the current fragment is not a data fragment).
-  MCDataFragment *DF = getOrCreateDataFragment();
-
-  // Add the fixups and data.
-  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
-    Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
-    DF->getFixups().push_back(Fixups[i]);
-  }
-  DF->setHasInstructions(true);
-  DF->getContents().append(Code.begin(), Code.end());
-}
-
-void MCWasmStreamer::FinishImpl() {
-  EmitFrames(nullptr);
-
-  this->MCObjectStreamer::FinishImpl();
-}
-
-MCStreamer *llvm::createWasmStreamer(MCContext &Context,
-                                     std::unique_ptr<MCAsmBackend> &&MAB,
-                                     raw_pwrite_stream &OS,
-                                     std::unique_ptr<MCCodeEmitter> &&CE,
-                                     bool RelaxAll) {
-  MCWasmStreamer *S =
-      new MCWasmStreamer(Context, std::move(MAB), OS, std::move(CE));
-  if (RelaxAll)
-    S->getAssembler().setRelaxAll(true);
-  return S;
-}
-
-void MCWasmStreamer::EmitThumbFunc(MCSymbol *Func) {
-  llvm_unreachable("Generic Wasm doesn't support this directive");
-}
-
-void MCWasmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
-  llvm_unreachable("Wasm doesn't support this directive");
-}
-
-void MCWasmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
-                                  uint64_t Size, unsigned ByteAlignment) {
-  llvm_unreachable("Wasm doesn't support this directive");
-}
-
-void MCWasmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
-                                    uint64_t Size, unsigned ByteAlignment) {
-  llvm_unreachable("Wasm doesn't support this directive");
-}