TapiFile.cpp

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//===- TapiFile.cpp -------------------------------------------------------===//
//
// 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 defines the Text-based Dynamcic Library Stub format.
//
//===----------------------------------------------------------------------===//
 
#include "llvm/Object/TapiFile.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Object/Error.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/TextAPI/Symbol.h"
 
using namespace llvm;
using namespace MachO;
using namespace object;
 
static uint32_t getFlags(const Symbol *Sym) {
  uint32_t Flags = BasicSymbolRef::SF_Global;
  if (Sym->isUndefined())
    Flags |= BasicSymbolRef::SF_Undefined;
  else
    Flags |= BasicSymbolRef::SF_Exported;
 
  if (Sym->isWeakDefined() || Sym->isWeakReferenced())
    Flags |= BasicSymbolRef::SF_Weak;
 
  return Flags;
}
 
TapiFile::TapiFile(MemoryBufferRef Source, const InterfaceFile &interface,
                   Architecture Arch)
    : SymbolicFile(ID_TapiFile, Source), Arch(Arch) {
  for (const auto *Symbol : interface.symbols()) {
    if (!Symbol->getArchitectures().has(Arch))
      continue;
 
    switch (Symbol->getKind()) {
    case SymbolKind::GlobalSymbol:
      Symbols.emplace_back(StringRef(), Symbol->getName(), getFlags(Symbol));
      break;
    case SymbolKind::ObjectiveCClass:
      if (interface.getPlatforms().count(PlatformKind::macOS) &&
          Arch == AK_i386) {
        Symbols.emplace_back(ObjC1ClassNamePrefix, Symbol->getName(),
                             getFlags(Symbol));
      } else {
        Symbols.emplace_back(ObjC2ClassNamePrefix, Symbol->getName(),
                             getFlags(Symbol));
        Symbols.emplace_back(ObjC2MetaClassNamePrefix, Symbol->getName(),
                             getFlags(Symbol));
      }
      break;
    case SymbolKind::ObjectiveCClassEHType:
      Symbols.emplace_back(ObjC2EHTypePrefix, Symbol->getName(),
                           getFlags(Symbol));
      break;
    case SymbolKind::ObjectiveCInstanceVariable:
      Symbols.emplace_back(ObjC2IVarPrefix, Symbol->getName(),
                           getFlags(Symbol));
      break;
    }
  }
}
 
TapiFile::~TapiFile() = default;
 
void TapiFile::moveSymbolNext(DataRefImpl &DRI) const { DRI.d.a++; }
 
Error TapiFile::printSymbolName(raw_ostream &OS, DataRefImpl DRI) const {
  assert(DRI.d.a < Symbols.size() && "Attempt to access symbol out of bounds");
  const Symbol &Sym = Symbols[DRI.d.a];
  OS << Sym.Prefix << Sym.Name;
  return Error::success();
}
 
Expected<uint32_t> TapiFile::getSymbolFlags(DataRefImpl DRI) const {
  assert(DRI.d.a < Symbols.size() && "Attempt to access symbol out of bounds");
  return Symbols[DRI.d.a].Flags;
}
 
basic_symbol_iterator TapiFile::symbol_begin() const {
  DataRefImpl DRI;
  DRI.d.a = 0;
  return BasicSymbolRef{DRI, this};
}
 
basic_symbol_iterator TapiFile::symbol_end() const {
  DataRefImpl DRI;
  DRI.d.a = Symbols.size();
  return BasicSymbolRef{DRI, this};
}