1 files changed, 221 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Object/ModuleSymbolTable.cpp b/contrib/llvm-project/llvm/lib/Object/ModuleSymbolTable.cpp
new file mode 100644
index 000000000000..d1e0ce5edae1
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Object/ModuleSymbolTable.cpp
@@ -0,0 +1,221 @@
+//===- ModuleSymbolTable.cpp - symbol table for in-memory IR --------------===//
+//
+// 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 class represents a symbol table built from in-memory IR. It provides
+// access to GlobalValues and should only be used if such access is required
+// (e.g. in the LTO implementation).
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/ModuleSymbolTable.h"
+#include "RecordStreamer.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalAlias.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDirectives.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCParser/MCTargetAsmParser.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCTargetOptions.h"
+#include "llvm/Object/SymbolicFile.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SMLoc.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <memory>
+#include <string>
+
+using namespace llvm;
+using namespace object;
+
+void ModuleSymbolTable::addModule(Module *M) {
+  if (FirstMod)
+    assert(FirstMod->getTargetTriple() == M->getTargetTriple());
+  else
+    FirstMod = M;
+
+  for (GlobalValue &GV : M->global_values())
+    SymTab.push_back(&GV);
+
+  CollectAsmSymbols(*M, [this](StringRef Name, BasicSymbolRef::Flags Flags) {
+    SymTab.push_back(new (AsmSymbols.Allocate()) AsmSymbol(Name, Flags));
+  });
+}
+
+static void
+initializeRecordStreamer(const Module &M,
+                         function_ref<void(RecordStreamer &)> Init) {
+  StringRef InlineAsm = M.getModuleInlineAsm();
+  if (InlineAsm.empty())
+    return;
+
+  std::string Err;
+  const Triple TT(M.getTargetTriple());
+  const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
+  assert(T && T->hasMCAsmParser());
+
+  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, MCCtx);
+  MOFI.setSDKVersion(M.getSDKVersion());
+  RecordStreamer Streamer(MCCtx, M);
+  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;
+
+  Init(Streamer);
+}
+
+void ModuleSymbolTable::CollectAsmSymbols(
+    const Module &M,
+    function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmSymbol) {
+  initializeRecordStreamer(M, [&](RecordStreamer &Streamer) {
+    Streamer.flushSymverDirectives();
+
+    for (auto &KV : Streamer) {
+      StringRef Key = KV.first();
+      RecordStreamer::State Value = KV.second;
+      // FIXME: For now we just assume that all asm symbols are executable.
+      uint32_t Res = BasicSymbolRef::SF_Executable;
+      switch (Value) {
+      case RecordStreamer::NeverSeen:
+        llvm_unreachable("NeverSeen should have been replaced earlier");
+      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::DefinedWeak:
+        Res |= BasicSymbolRef::SF_Weak;
+        Res |= BasicSymbolRef::SF_Global;
+        break;
+      case RecordStreamer::UndefinedWeak:
+        Res |= BasicSymbolRef::SF_Weak;
+        Res |= BasicSymbolRef::SF_Undefined;
+      }
+      AsmSymbol(Key, BasicSymbolRef::Flags(Res));
+    }
+  });
+}
+
+void ModuleSymbolTable::CollectAsmSymvers(
+    const Module &M, function_ref<void(StringRef, StringRef)> AsmSymver) {
+  initializeRecordStreamer(M, [&](RecordStreamer &Streamer) {
+    for (auto &KV : Streamer.symverAliases())
+      for (auto &Alias : KV.second)
+        AsmSymver(KV.first->getName(), Alias);
+  });
+}
+
+void ModuleSymbolTable::printSymbolName(raw_ostream &OS, Symbol S) const {
+  if (S.is<AsmSymbol *>()) {
+    OS << S.get<AsmSymbol *>()->first;
+    return;
+  }
+
+  auto *GV = S.get<GlobalValue *>();
+  if (GV->hasDLLImportStorageClass())
+    OS << "__imp_";
+
+  Mang.getNameWithPrefix(OS, GV, false);
+}
+
+uint32_t ModuleSymbolTable::getSymbolFlags(Symbol S) const {
+  if (S.is<AsmSymbol *>())
+    return S.get<AsmSymbol *>()->second;
+
+  auto *GV = S.get<GlobalValue *>();
+
+  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 (dyn_cast_or_null<Function>(GV->getBaseObject()))
+    Res |= BasicSymbolRef::SF_Executable;
+  if (isa<GlobalAlias>(GV))
+    Res |= BasicSymbolRef::SF_Indirect;
+  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;
+}