Revert D60974 "[clang-ifs] Clang Interface Stubs, first version."

This reverts commit rC363626.

clangIndex depends on clangFrontend. r363626 adds a dependency from
clangFrontend to clangIndex, which creates a circular dependency.

This is disallowed by -DBUILD_SHARED_LIBS=on builds:

    CMake Error: The inter-target dependency graph contains the following strongly connected component (cycle):
      "clangFrontend" of type SHARED_LIBRARY
        depends on "clangIndex" (weak)
      "clangIndex" of type SHARED_LIBRARY
        depends on "clangFrontend" (weak)
    At least one of these targets is not a STATIC_LIBRARY.  Cyclic dependencies are allowed only among static libraries.

Note, the dependency on clangIndex cannot be removed because
libclangFrontend.so is linked with -Wl,-z,defs: a shared object must
have its full direct dependencies specified on the linker command line.

In -DBUILD_SHARED_LIBS=off builds, this appears to work when linking
`bin/clang-9`. However, it can cause trouble to downstream clang library
users. The llvm build system links libraries this way:

    clang main_program_object_file ... lib/libclangIndex.a ...  lib/libclangFrontend.a -o exe

libclangIndex.a etc are not wrapped in --start-group.

If the downstream application depends on libclangFrontend.a but not any
other clang libraries that depend on libclangIndex.a, this can cause undefined
reference errors when the linker is ld.bfd or gold.

The proper fix is to not include clangIndex files in clangFrontend.

llvm-svn: 363649

1 files changed, 0 insertions, 379 deletions

diff --git a/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp b/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
deleted file mode 100644
index 4a54496..0000000
--- a/clang/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
+++ /dev/null
@@ -1,379 +0,0 @@
-//===--- InterfaceStubFunctionsConsumer.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
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/AST/RecursiveASTVisitor.h"
-#include "clang/Frontend/CompilerInstance.h"
-#include "clang/Frontend/FrontendActions.h"
-#include "clang/Index/CodegenNameGenerator.h"
-#include "clang/Sema/TemplateInstCallback.h"
-#include "llvm/BinaryFormat/ELF.h"
-
-using namespace clang;
-
-class InterfaceStubFunctionsConsumer : public ASTConsumer {
-  CompilerInstance &Instance;
-  StringRef InFile;
-  StringRef Format;
-  std::set<std::string> ParsedTemplates;
-
-  enum RootDeclOrigin { TopLevel = 0, FromTU = 1, IsLate = 2 };
-  struct MangledSymbol {
-    std::string ParentName;
-    uint8_t Type;
-    uint8_t Binding;
-    std::vector<std::string> Names;
-    MangledSymbol() = delete;
-
-    MangledSymbol(const std::string &ParentName, uint8_t Type, uint8_t Binding,
-                  std::vector<std::string> Names)
-        : ParentName(ParentName), Type(Type), Binding(Binding), Names(Names) {}
-  };
-  using MangledSymbols = std::map<const NamedDecl *, MangledSymbol>;
-
-  bool WriteNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
-    // Here we filter out anything that's not set to DefaultVisibility.
-    // DefaultVisibility is set on a decl when -fvisibility is not specified on
-    // the command line (or specified as default) and the decl does not have
-    // __attribute__((visibility("hidden"))) set or when the command line
-    // argument is set to hidden but the decl explicitly has
-    // __attribute__((visibility ("default"))) set. We do this so that the user
-    // can have fine grain control of what they want to expose in the stub.
-    auto isVisible = [](const NamedDecl *ND) -> bool {
-      return ND->getVisibility() == DefaultVisibility;
-    };
-
-    auto ignoreDecl = [this, isVisible](const NamedDecl *ND) -> bool {
-      if (!isVisible(ND))
-        return true;
-
-      if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
-        if ((VD->getStorageClass() == StorageClass::SC_Extern) ||
-            (VD->getStorageClass() == StorageClass::SC_Static &&
-             VD->getParentFunctionOrMethod() == nullptr))
-          return true;
-
-      if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
-        if (FD->isInlined() && !isa<CXXMethodDecl>(FD) &&
-            !Instance.getLangOpts().GNUInline)
-          return true;
-        if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
-          if (const auto *RC = dyn_cast<CXXRecordDecl>(MD->getParent()))
-            if (isa<ClassTemplateDecl>(RC->getParent()) || !isVisible(RC))
-              return true;
-          if (MD->isDependentContext() || !MD->hasBody())
-            return true;
-        }
-        if (FD->getStorageClass() == StorageClass::SC_Static)
-          return true;
-      }
-      return false;
-    };
-
-    auto getParentFunctionDecl = [](const NamedDecl *ND) -> const NamedDecl * {
-      if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
-        if (const auto *FD =
-                dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod()))
-          return FD;
-      return nullptr;
-    };
-
-    auto getMangledNames = [](const NamedDecl *ND) -> std::vector<std::string> {
-      if (!ND)
-        return {""};
-      index::CodegenNameGenerator CGNameGen(ND->getASTContext());
-      std::string MangledName = CGNameGen.getName(ND);
-      std::vector<std::string> MangledNames = CGNameGen.getAllManglings(ND);
-      if (isa<CXXConstructorDecl>(ND) || isa<CXXDestructorDecl>(ND))
-        return MangledNames;
-#ifdef EXPENSIVE_CHECKS
-      assert(MangledNames.size() <= 1 && "Expected only one name mangling.");
-#endif
-      return {MangledName};
-    };
-
-    if (!(RDO & FromTU))
-      return true;
-    if (Symbols.find(ND) != Symbols.end())
-      return true;
-    // - Currently have not figured out how to produce the names for FieldDecls.
-    // - Do not want to produce symbols for function paremeters.
-    if (isa<FieldDecl>(ND) || isa<ParmVarDecl>(ND))
-      return true;
-
-    const NamedDecl *ParentDecl = getParentFunctionDecl(ND);
-    if ((ParentDecl && ignoreDecl(ParentDecl)) || ignoreDecl(ND))
-      return true;
-
-    if (RDO & IsLate) {
-      Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
-          << "Generating Interface Stubs is not supported with "
-             "delayed template parsing.";
-    } else {
-      if (const auto *FD = dyn_cast<FunctionDecl>(ND))
-        if (FD->isDependentContext())
-          return true;
-
-      const bool IsWeak = (ND->hasAttr<WeakAttr>() ||
-                           ND->hasAttr<WeakRefAttr>() || ND->isWeakImported());
-
-      Symbols.insert(std::make_pair(
-          ND,
-          MangledSymbol(getMangledNames(ParentDecl).front(),
-                        // Type:
-                        isa<VarDecl>(ND) ? llvm::ELF::STT_OBJECT
-                                         : llvm::ELF::STT_FUNC,
-                        // Binding:
-                        IsWeak ? llvm::ELF::STB_WEAK : llvm::ELF::STB_GLOBAL,
-                        getMangledNames(ND))));
-    }
-    return true;
-  }
-
-  void
-  HandleDecls(const llvm::iterator_range<DeclContext::decl_iterator> &Decls,
-              MangledSymbols &Symbols, int RDO) {
-    for (const auto *D : Decls)
-      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
-  }
-
-  void HandleTemplateSpecializations(const FunctionTemplateDecl &FTD,
-                                     MangledSymbols &Symbols, int RDO) {
-    for (const auto *D : FTD.specializations())
-      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
-  }
-
-  void HandleTemplateSpecializations(const ClassTemplateDecl &CTD,
-                                     MangledSymbols &Symbols, int RDO) {
-    for (const auto *D : CTD.specializations())
-      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
-  }
-
-  bool HandleNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
-    if (!ND)
-      return false;
-
-    switch (ND->getKind()) {
-    default:
-      break;
-    case Decl::Kind::Namespace:
-      HandleDecls(cast<NamespaceDecl>(ND)->decls(), Symbols, RDO);
-      return true;
-    case Decl::Kind::CXXRecord:
-      HandleDecls(cast<CXXRecordDecl>(ND)->decls(), Symbols, RDO);
-      return true;
-    case Decl::Kind::ClassTemplateSpecialization:
-      HandleDecls(cast<ClassTemplateSpecializationDecl>(ND)->decls(), Symbols,
-                  RDO);
-      return true;
-    case Decl::Kind::ClassTemplate:
-      HandleTemplateSpecializations(*cast<ClassTemplateDecl>(ND), Symbols, RDO);
-      return true;
-    case Decl::Kind::FunctionTemplate:
-      HandleTemplateSpecializations(*cast<FunctionTemplateDecl>(ND), Symbols,
-                                    RDO);
-      return true;
-    case Decl::Kind::TemplateTypeParm:
-      return true;
-    case Decl::Kind::Var:
-    case Decl::Kind::ParmVar:
-    case Decl::Kind::CXXMethod:
-    case Decl::Kind::CXXConstructor:
-    case Decl::Kind::CXXDestructor:
-    case Decl::Kind::Function:
-    case Decl::Kind::Field:
-      if (WriteNamedDecl(ND, Symbols, RDO))
-        return true;
-    }
-
-    // While interface stubs are in the development stage, it's probably best to
-    // catch anything that's not a VarDecl or Template/FunctionDecl.
-    Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
-        << "Expected a function or function template decl.";
-    return false;
-  }
-
-public:
-  InterfaceStubFunctionsConsumer(CompilerInstance &Instance, StringRef InFile,
-                                 StringRef Format)
-      : Instance(Instance), InFile(InFile), Format(Format) {}
-
-  void HandleTranslationUnit(ASTContext &context) override {
-    struct Visitor : public RecursiveASTVisitor<Visitor> {
-      bool VisitNamedDecl(NamedDecl *ND) {
-        if (const auto *FD = dyn_cast<FunctionDecl>(ND))
-          if (FD->isLateTemplateParsed()) {
-            LateParsedDecls.insert(FD);
-            return true;
-          }
-
-        if (const auto *VD = dyn_cast<ValueDecl>(ND)) {
-          ValueDecls.insert(VD);
-          return true;
-        }
-
-        NamedDecls.insert(ND);
-        return true;
-      }
-
-      std::set<const NamedDecl *> LateParsedDecls;
-      std::set<NamedDecl *> NamedDecls;
-      std::set<const ValueDecl *> ValueDecls;
-    } v;
-
-    v.TraverseDecl(context.getTranslationUnitDecl());
-
-    MangledSymbols Symbols;
-    auto OS = Instance.createDefaultOutputFile(/*Binary=*/false, InFile, "ifs");
-    if (!OS)
-      return;
-
-    if (Instance.getLangOpts().DelayedTemplateParsing) {
-      clang::Sema &S = Instance.getSema();
-      for (const auto *FD : v.LateParsedDecls) {
-        clang::LateParsedTemplate &LPT =
-            *S.LateParsedTemplateMap.find(cast<FunctionDecl>(FD))->second;
-        S.LateTemplateParser(S.OpaqueParser, LPT);
-        HandleNamedDecl(FD, Symbols, (FromTU | IsLate));
-      }
-    }
-
-    for (const NamedDecl *ND : v.ValueDecls)
-      HandleNamedDecl(ND, Symbols, FromTU);
-    for (const NamedDecl *ND : v.NamedDecls)
-      HandleNamedDecl(ND, Symbols, FromTU);
-
-    auto writeIfoYaml = [this](const llvm::Triple &T,
-                               const MangledSymbols &Symbols,
-                               const ASTContext &context, StringRef Format,
-                               raw_ostream &OS) -> void {
-      OS << "--- !" << Format << "\n";
-      OS << "FileHeader:\n";
-      OS << "  Class:           ELFCLASS";
-      OS << (T.isArch64Bit() ? "64" : "32");
-      OS << "\n";
-      OS << "  Data:            ELFDATA2";
-      OS << (T.isLittleEndian() ? "LSB" : "MSB");
-      OS << "\n";
-      OS << "  Type:            ET_REL\n";
-      OS << "  Machine:         "
-         << llvm::StringSwitch<llvm::StringRef>(T.getArchName())
-                .Case("x86_64", "EM_X86_64")
-                .Case("i386", "EM_386")
-                .Case("i686", "EM_386")
-                .Case("aarch64", "EM_AARCH64")
-                .Case("amdgcn", "EM_AMDGPU")
-                .Case("r600", "EM_AMDGPU")
-                .Case("arm", "EM_ARM")
-                .Case("thumb", "EM_ARM")
-                .Case("avr", "EM_AVR")
-                .Case("mips", "EM_MIPS")
-                .Case("mipsel", "EM_MIPS")
-                .Case("mips64", "EM_MIPS")
-                .Case("mips64el", "EM_MIPS")
-                .Case("msp430", "EM_MSP430")
-                .Case("ppc", "EM_PPC")
-                .Case("ppc64", "EM_PPC64")
-                .Case("ppc64le", "EM_PPC64")
-                .Case("x86", T.isOSIAMCU() ? "EM_IAMCU" : "EM_386")
-                .Case("x86_64", "EM_X86_64")
-                .Default("EM_NONE")
-         << "\nSymbols:\n";
-      for (const auto &E : Symbols) {
-        const MangledSymbol &Symbol = E.second;
-        for (auto Name : Symbol.Names) {
-          OS << "  - Name:            "
-             << (Symbol.ParentName.empty() || Instance.getLangOpts().CPlusPlus
-                     ? ""
-                     : (Symbol.ParentName + "."))
-             << Name << "\n"
-             << "    Type:            STT_";
-          switch (Symbol.Type) {
-          default:
-          case llvm::ELF::STT_NOTYPE:
-            OS << "NOTYPE";
-            break;
-          case llvm::ELF::STT_OBJECT:
-            OS << "OBJECT";
-            break;
-          case llvm::ELF::STT_FUNC:
-            OS << "FUNC";
-            break;
-          }
-          OS << "\n    Binding:         STB_"
-             << ((Symbol.Binding == llvm::ELF::STB_WEAK) ? "WEAK" : "GLOBAL")
-             << "\n";
-        }
-      }
-      OS << "...\n";
-      OS.flush();
-    };
-
-    auto writeIfoElfAbiYaml =
-        [this](const llvm::Triple &T, const MangledSymbols &Symbols,
-               const ASTContext &context, StringRef Format,
-               raw_ostream &OS) -> void {
-      OS << "--- !" << Format << "\n";
-      OS << "TbeVersion: 1.0\n";
-      OS << "Arch: " << T.getArchName() << "\n";
-      OS << "Symbols:\n";
-      for (const auto &E : Symbols) {
-        const MangledSymbol &Symbol = E.second;
-        for (auto Name : Symbol.Names) {
-          OS << "  "
-             << (Symbol.ParentName.empty() || Instance.getLangOpts().CPlusPlus
-                     ? ""
-                     : (Symbol.ParentName + "."))
-             << Name << ": { Type: ";
-          switch (Symbol.Type) {
-          default:
-            llvm_unreachable(
-                "clang -emit-iterface-stubs: Unexpected symbol type.");
-          case llvm::ELF::STT_NOTYPE:
-            OS << "NoType";
-            break;
-          case llvm::ELF::STT_OBJECT: {
-            auto VD = cast<ValueDecl>(E.first)->getType();
-            OS << "Object, Size: "
-               << context.getTypeSizeInChars(VD).getQuantity();
-            break;
-          }
-          case llvm::ELF::STT_FUNC:
-            OS << "Func";
-            break;
-          }
-          if (Symbol.Binding == llvm::ELF::STB_WEAK)
-            OS << ", Weak: true";
-          OS << " }\n";
-        }
-      }
-      OS << "...\n";
-      OS.flush();
-    };
-
-    if (Format == "experimental-yaml-elf-v1")
-      writeIfoYaml(Instance.getTarget().getTriple(), Symbols, context, Format,
-                   *OS);
-    else
-      writeIfoElfAbiYaml(Instance.getTarget().getTriple(), Symbols, context,
-                         Format, *OS);
-  }
-};
-
-std::unique_ptr<ASTConsumer>
-GenerateInterfaceYAMLExpV1Action::CreateASTConsumer(CompilerInstance &CI,
-                                                    StringRef InFile) {
-  return llvm::make_unique<InterfaceStubFunctionsConsumer>(
-      CI, InFile, "experimental-yaml-elf-v1");
-}
-
-std::unique_ptr<ASTConsumer>
-GenerateInterfaceTBEExpV1Action::CreateASTConsumer(CompilerInstance &CI,
-                                                   StringRef InFile) {
-  return llvm::make_unique<InterfaceStubFunctionsConsumer>(
-      CI, InFile, "experimental-tapi-elf-v1");
-}