vendor/llvm/llvm-trunk-r290819

1 files changed, 44 insertions, 232 deletions

diff --git a/lib/Object/IRObjectFile.cpp b/lib/Object/IRObjectFile.cpp
index 42c8ecd62da8..adbf0de6d1bc 100644
--- a/lib/Object/IRObjectFile.cpp
+++ b/lib/Object/IRObjectFile.cpp
@@ -14,7 +14,7 @@
 #include "llvm/Object/IRObjectFile.h"
 #include "RecordStreamer.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Bitcode/BitcodeReader.h"
 #include "llvm/IR/GVMaterializer.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Mangler.h"
@@ -35,246 +35,52 @@
 using namespace llvm;
 using namespace object;
 
-IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
-    : SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
-  Mang.reset(new Mangler());
-  CollectAsmUndefinedRefs(Triple(M->getTargetTriple()), M->getModuleInlineAsm(),
-                          [this](StringRef Name, BasicSymbolRef::Flags Flags) {
-                            AsmSymbols.emplace_back(Name, std::move(Flags));
-                          });
+IRObjectFile::IRObjectFile(MemoryBufferRef Object,
+                           std::vector<std::unique_ptr<Module>> Mods)
+    : SymbolicFile(Binary::ID_IR, Object), Mods(std::move(Mods)) {
+  for (auto &M : this->Mods)
+    SymTab.addModule(M.get());
 }
 
-// Parse inline ASM and collect the list of symbols that are not defined in
-// the current module. This is inspired from IRObjectFile.
-void IRObjectFile::CollectAsmUndefinedRefs(
-    const Triple &TT, StringRef InlineAsm,
-    function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmUndefinedRefs) {
-  if (InlineAsm.empty())
-    return;
+IRObjectFile::~IRObjectFile() {}
 
-  std::string Err;
-  const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
-  if (!T)
-    return;
-
-  std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(TT.str()));
-  if (!MRI)
-    return;
-
-  std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, TT.str()));
-  if (!MAI)
-    return;
-
-  std::unique_ptr<MCSubtargetInfo> STI(
-      T->createMCSubtargetInfo(TT.str(), "", ""));
-  if (!STI)
-    return;
-
-  std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
-  if (!MCII)
-    return;
-
-  MCObjectFileInfo MOFI;
-  MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
-  MOFI.InitMCObjectFileInfo(TT, /*PIC*/ false, CodeModel::Default, MCCtx);
-  std::unique_ptr<RecordStreamer> Streamer(new RecordStreamer(MCCtx));
-  T->createNullTargetStreamer(*Streamer);
-
-  std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
-  SourceMgr SrcMgr;
-  SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
-  std::unique_ptr<MCAsmParser> Parser(
-      createMCAsmParser(SrcMgr, MCCtx, *Streamer, *MAI));
-
-  MCTargetOptions MCOptions;
-  std::unique_ptr<MCTargetAsmParser> TAP(
-      T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
-  if (!TAP)
-    return;
-
-  Parser->setTargetParser(*TAP);
-  if (Parser->Run(false))
-    return;
-
-  for (auto &KV : *Streamer) {
-    StringRef Key = KV.first();
-    RecordStreamer::State Value = KV.second;
-    uint32_t Res = BasicSymbolRef::SF_None;
-    switch (Value) {
-    case RecordStreamer::NeverSeen:
-      llvm_unreachable("foo");
-    case RecordStreamer::DefinedGlobal:
-      Res |= BasicSymbolRef::SF_Global;
-      break;
-    case RecordStreamer::Defined:
-      break;
-    case RecordStreamer::Global:
-    case RecordStreamer::Used:
-      Res |= BasicSymbolRef::SF_Undefined;
-      Res |= BasicSymbolRef::SF_Global;
-      break;
-    case RecordStreamer::GlobalWeak:
-      Res |= BasicSymbolRef::SF_Weak;
-      Res |= BasicSymbolRef::SF_Global;
-      break;
-    }
-    AsmUndefinedRefs(Key, BasicSymbolRef::Flags(Res));
-  }
-}
-
-IRObjectFile::~IRObjectFile() {
- }
-
-static GlobalValue *getGV(DataRefImpl &Symb) {
-  if ((Symb.p & 3) == 3)
-    return nullptr;
-
-  return reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
-}
-
-static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
-  if (I == M.alias_end())
-    return 3;
-  const GlobalValue *GV = &*I;
-  return reinterpret_cast<uintptr_t>(GV) | 2;
-}
-
-static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
-  if (I == M.global_end())
-    return skipEmpty(M.alias_begin(), M);
-  const GlobalValue *GV = &*I;
-  return reinterpret_cast<uintptr_t>(GV) | 1;
-}
-
-static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
-  if (I == M.end())
-    return skipEmpty(M.global_begin(), M);
-  const GlobalValue *GV = &*I;
-  return reinterpret_cast<uintptr_t>(GV) | 0;
-}
-
-static unsigned getAsmSymIndex(DataRefImpl Symb) {
-  assert((Symb.p & uintptr_t(3)) == 3);
-  uintptr_t Index = Symb.p & ~uintptr_t(3);
-  Index >>= 2;
-  return Index;
+static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) {
+  return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p);
 }
 
 void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
-  const GlobalValue *GV = getGV(Symb);
-  uintptr_t Res;
-
-  switch (Symb.p & 3) {
-  case 0: {
-    Module::const_iterator Iter(static_cast<const Function*>(GV));
-    ++Iter;
-    Res = skipEmpty(Iter, *M);
-    break;
-  }
-  case 1: {
-    Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
-    ++Iter;
-    Res = skipEmpty(Iter, *M);
-    break;
-  }
-  case 2: {
-    Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
-    ++Iter;
-    Res = skipEmpty(Iter, *M);
-    break;
-  }
-  case 3: {
-    unsigned Index = getAsmSymIndex(Symb);
-    assert(Index < AsmSymbols.size());
-    ++Index;
-    Res = (Index << 2) | 3;
-    break;
-  }
-  default:
-    llvm_unreachable("unreachable case");
-  }
-
-  Symb.p = Res;
+  Symb.p += sizeof(ModuleSymbolTable::Symbol);
 }
 
 std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
                                               DataRefImpl Symb) const {
-  const GlobalValue *GV = getGV(Symb);
-  if (!GV) {
-    unsigned Index = getAsmSymIndex(Symb);
-    assert(Index <= AsmSymbols.size());
-    OS << AsmSymbols[Index].first;
-    return std::error_code();
-  }
-
-  if (GV->hasDLLImportStorageClass())
-    OS << "__imp_";
-
-  if (Mang)
-    Mang->getNameWithPrefix(OS, GV, false);
-  else
-    OS << GV->getName();
-
+  SymTab.printSymbolName(OS, getSym(Symb));
   return std::error_code();
 }
 
 uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
-  const GlobalValue *GV = getGV(Symb);
-
-  if (!GV) {
-    unsigned Index = getAsmSymIndex(Symb);
-    assert(Index <= AsmSymbols.size());
-    return AsmSymbols[Index].second;
-  }
-
-  uint32_t Res = BasicSymbolRef::SF_None;
-  if (GV->isDeclarationForLinker())
-    Res |= BasicSymbolRef::SF_Undefined;
-  else if (GV->hasHiddenVisibility() && !GV->hasLocalLinkage())
-    Res |= BasicSymbolRef::SF_Hidden;
-  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
-    if (GVar->isConstant())
-      Res |= BasicSymbolRef::SF_Const;
-  }
-  if (GV->hasPrivateLinkage())
-    Res |= BasicSymbolRef::SF_FormatSpecific;
-  if (!GV->hasLocalLinkage())
-    Res |= BasicSymbolRef::SF_Global;
-  if (GV->hasCommonLinkage())
-    Res |= BasicSymbolRef::SF_Common;
-  if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
-      GV->hasExternalWeakLinkage())
-    Res |= BasicSymbolRef::SF_Weak;
-
-  if (GV->getName().startswith("llvm."))
-    Res |= BasicSymbolRef::SF_FormatSpecific;
-  else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
-    if (Var->getSection() == "llvm.metadata")
-      Res |= BasicSymbolRef::SF_FormatSpecific;
-  }
-
-  return Res;
+  return SymTab.getSymbolFlags(getSym(Symb));
 }
 
-GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) { return getGV(Symb); }
-
-std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
-
-basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
-  Module::const_iterator I = M->begin();
+basic_symbol_iterator IRObjectFile::symbol_begin() const {
   DataRefImpl Ret;
-  Ret.p = skipEmpty(I, *M);
+  Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data());
   return basic_symbol_iterator(BasicSymbolRef(Ret, this));
 }
 
-basic_symbol_iterator IRObjectFile::symbol_end_impl() const {
+basic_symbol_iterator IRObjectFile::symbol_end() const {
   DataRefImpl Ret;
-  uint64_t NumAsm = AsmSymbols.size();
-  NumAsm <<= 2;
-  Ret.p = 3 | NumAsm;
+  Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() +
+                                      SymTab.symbols().size());
   return basic_symbol_iterator(BasicSymbolRef(Ret, this));
 }
 
+StringRef IRObjectFile::getTargetTriple() const {
+  // Each module must have the same target triple, so we arbitrarily access the
+  // first one.
+  return Mods[0]->getTargetTriple();
+}
+
 ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
   for (const SectionRef &Sec : Obj.sections()) {
     if (Sec.isBitcode()) {
@@ -307,22 +113,28 @@ ErrorOr<MemoryBufferRef> IRObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Ob
   }
 }
 
-ErrorOr<std::unique_ptr<IRObjectFile>>
-llvm::object::IRObjectFile::create(MemoryBufferRef Object,
-                                   LLVMContext &Context) {
+Expected<std::unique_ptr<IRObjectFile>>
+IRObjectFile::create(MemoryBufferRef Object, LLVMContext &Context) {
   ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
   if (!BCOrErr)
-    return BCOrErr.getError();
-
-  std::unique_ptr<MemoryBuffer> Buff =
-      MemoryBuffer::getMemBuffer(BCOrErr.get(), false);
-
-  ErrorOr<std::unique_ptr<Module>> MOrErr =
-      getLazyBitcodeModule(std::move(Buff), Context,
-                           /*ShouldLazyLoadMetadata*/ true);
-  if (std::error_code EC = MOrErr.getError())
-    return EC;
+    return errorCodeToError(BCOrErr.getError());
+
+  Expected<std::vector<BitcodeModule>> BMsOrErr =
+      getBitcodeModuleList(*BCOrErr);
+  if (!BMsOrErr)
+    return BMsOrErr.takeError();
+
+  std::vector<std::unique_ptr<Module>> Mods;
+  for (auto BM : *BMsOrErr) {
+    Expected<std::unique_ptr<Module>> MOrErr =
+        BM.getLazyModule(Context, /*ShouldLazyLoadMetadata*/ true,
+                         /*IsImporting*/ false);
+    if (!MOrErr)
+      return MOrErr.takeError();
+
+    Mods.push_back(std::move(*MOrErr));
+  }
 
-  std::unique_ptr<Module> &M = MOrErr.get();
-  return llvm::make_unique<IRObjectFile>(Object, std::move(M));
+  return std::unique_ptr<IRObjectFile>(
+      new IRObjectFile(*BCOrErr, std::move(Mods)));
 }