vendor/clang/clang-trunk-r366426

1 files changed, 208 insertions, 4 deletions

diff --git a/lib/AST/Mangle.cpp b/lib/AST/Mangle.cpp
index bb29bffc1b8fb..625282368a4d1 100644
--- a/lib/AST/Mangle.cpp
+++ b/lib/AST/Mangle.cpp
@@ -1,9 +1,8 @@
 //===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// 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
 //
 //===----------------------------------------------------------------------===//
 //
@@ -18,10 +17,13 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/Mangle.h"
+#include "clang/AST/VTableBuilder.h"
 #include "clang/Basic/ABI.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Mangler.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -281,3 +283,205 @@ void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
   mangleObjCMethodNameWithoutSize(MD, OS);
   Out << OS.str().size() << OS.str();
 }
+
+class ASTNameGenerator::Implementation {
+  std::unique_ptr<MangleContext> MC;
+  llvm::DataLayout DL;
+
+public:
+  explicit Implementation(ASTContext &Ctx)
+      : MC(Ctx.createMangleContext()), DL(Ctx.getTargetInfo().getDataLayout()) {
+  }
+
+  bool writeName(const Decl *D, raw_ostream &OS) {
+    // First apply frontend mangling.
+    SmallString<128> FrontendBuf;
+    llvm::raw_svector_ostream FrontendBufOS(FrontendBuf);
+    if (auto *FD = dyn_cast<FunctionDecl>(D)) {
+      if (FD->isDependentContext())
+        return true;
+      if (writeFuncOrVarName(FD, FrontendBufOS))
+        return true;
+    } else if (auto *VD = dyn_cast<VarDecl>(D)) {
+      if (writeFuncOrVarName(VD, FrontendBufOS))
+        return true;
+    } else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
+      MC->mangleObjCMethodNameWithoutSize(MD, OS);
+      return false;
+    } else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
+      writeObjCClassName(ID, FrontendBufOS);
+    } else {
+      return true;
+    }
+
+    // Now apply backend mangling.
+    llvm::Mangler::getNameWithPrefix(OS, FrontendBufOS.str(), DL);
+    return false;
+  }
+
+  std::string getName(const Decl *D) {
+    std::string Name;
+    {
+      llvm::raw_string_ostream OS(Name);
+      writeName(D, OS);
+    }
+    return Name;
+  }
+
+  enum ObjCKind {
+    ObjCClass,
+    ObjCMetaclass,
+  };
+
+  static StringRef getClassSymbolPrefix(ObjCKind Kind,
+                                        const ASTContext &Context) {
+    if (Context.getLangOpts().ObjCRuntime.isGNUFamily())
+      return Kind == ObjCMetaclass ? "_OBJC_METACLASS_" : "_OBJC_CLASS_";
+    return Kind == ObjCMetaclass ? "OBJC_METACLASS_$_" : "OBJC_CLASS_$_";
+  }
+
+  std::vector<std::string> getAllManglings(const ObjCContainerDecl *OCD) {
+    StringRef ClassName;
+    if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
+      ClassName = OID->getObjCRuntimeNameAsString();
+    else if (const auto *OID = dyn_cast<ObjCImplementationDecl>(OCD))
+      ClassName = OID->getObjCRuntimeNameAsString();
+
+    if (ClassName.empty())
+      return {};
+
+    auto Mangle = [&](ObjCKind Kind, StringRef ClassName) -> std::string {
+      SmallString<40> Mangled;
+      auto Prefix = getClassSymbolPrefix(Kind, OCD->getASTContext());
+      llvm::Mangler::getNameWithPrefix(Mangled, Prefix + ClassName, DL);
+      return Mangled.str();
+    };
+
+    return {
+        Mangle(ObjCClass, ClassName),
+        Mangle(ObjCMetaclass, ClassName),
+    };
+  }
+
+  std::vector<std::string> getAllManglings(const Decl *D) {
+    if (const auto *OCD = dyn_cast<ObjCContainerDecl>(D))
+      return getAllManglings(OCD);
+
+    if (!(isa<CXXRecordDecl>(D) || isa<CXXMethodDecl>(D)))
+      return {};
+
+    const NamedDecl *ND = cast<NamedDecl>(D);
+
+    ASTContext &Ctx = ND->getASTContext();
+    std::unique_ptr<MangleContext> M(Ctx.createMangleContext());
+
+    std::vector<std::string> Manglings;
+
+    auto hasDefaultCXXMethodCC = [](ASTContext &C, const CXXMethodDecl *MD) {
+      auto DefaultCC = C.getDefaultCallingConvention(/*IsVariadic=*/false,
+                                                     /*IsCXXMethod=*/true);
+      auto CC = MD->getType()->getAs<FunctionProtoType>()->getCallConv();
+      return CC == DefaultCC;
+    };
+
+    if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) {
+      Manglings.emplace_back(getMangledStructor(CD, Ctor_Base));
+
+      if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily())
+        if (!CD->getParent()->isAbstract())
+          Manglings.emplace_back(getMangledStructor(CD, Ctor_Complete));
+
+      if (Ctx.getTargetInfo().getCXXABI().isMicrosoft())
+        if (CD->hasAttr<DLLExportAttr>() && CD->isDefaultConstructor())
+          if (!(hasDefaultCXXMethodCC(Ctx, CD) && CD->getNumParams() == 0))
+            Manglings.emplace_back(getMangledStructor(CD, Ctor_DefaultClosure));
+    } else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) {
+      Manglings.emplace_back(getMangledStructor(DD, Dtor_Base));
+      if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) {
+        Manglings.emplace_back(getMangledStructor(DD, Dtor_Complete));
+        if (DD->isVirtual())
+          Manglings.emplace_back(getMangledStructor(DD, Dtor_Deleting));
+      }
+    } else if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) {
+      Manglings.emplace_back(getName(ND));
+      if (MD->isVirtual())
+        if (const auto *TIV = Ctx.getVTableContext()->getThunkInfo(MD))
+          for (const auto &T : *TIV)
+            Manglings.emplace_back(getMangledThunk(MD, T));
+    }
+
+    return Manglings;
+  }
+
+private:
+  bool writeFuncOrVarName(const NamedDecl *D, raw_ostream &OS) {
+    if (MC->shouldMangleDeclName(D)) {
+      if (const auto *CtorD = dyn_cast<CXXConstructorDecl>(D))
+        MC->mangleCXXCtor(CtorD, Ctor_Complete, OS);
+      else if (const auto *DtorD = dyn_cast<CXXDestructorDecl>(D))
+        MC->mangleCXXDtor(DtorD, Dtor_Complete, OS);
+      else
+        MC->mangleName(D, OS);
+      return false;
+    } else {
+      IdentifierInfo *II = D->getIdentifier();
+      if (!II)
+        return true;
+      OS << II->getName();
+      return false;
+    }
+  }
+
+  void writeObjCClassName(const ObjCInterfaceDecl *D, raw_ostream &OS) {
+    OS << getClassSymbolPrefix(ObjCClass, D->getASTContext());
+    OS << D->getObjCRuntimeNameAsString();
+  }
+
+  std::string getMangledStructor(const NamedDecl *ND, unsigned StructorType) {
+    std::string FrontendBuf;
+    llvm::raw_string_ostream FOS(FrontendBuf);
+
+    if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND))
+      MC->mangleCXXCtor(CD, static_cast<CXXCtorType>(StructorType), FOS);
+    else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND))
+      MC->mangleCXXDtor(DD, static_cast<CXXDtorType>(StructorType), FOS);
+
+    std::string BackendBuf;
+    llvm::raw_string_ostream BOS(BackendBuf);
+
+    llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
+
+    return BOS.str();
+  }
+
+  std::string getMangledThunk(const CXXMethodDecl *MD, const ThunkInfo &T) {
+    std::string FrontendBuf;
+    llvm::raw_string_ostream FOS(FrontendBuf);
+
+    MC->mangleThunk(MD, T, FOS);
+
+    std::string BackendBuf;
+    llvm::raw_string_ostream BOS(BackendBuf);
+
+    llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
+
+    return BOS.str();
+  }
+};
+
+ASTNameGenerator::ASTNameGenerator(ASTContext &Ctx)
+    : Impl(llvm::make_unique<Implementation>(Ctx)) {}
+
+ASTNameGenerator::~ASTNameGenerator() {}
+
+bool ASTNameGenerator::writeName(const Decl *D, raw_ostream &OS) {
+  return Impl->writeName(D, OS);
+}
+
+std::string ASTNameGenerator::getName(const Decl *D) {
+  return Impl->getName(D);
+}
+
+std::vector<std::string> ASTNameGenerator::getAllManglings(const Decl *D) {
+  return Impl->getAllManglings(D);
+}