MFC r309124:

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0.  Also completely revamp the build system for
clang, llvm, lldb and their related tools.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.

Relnotes:	yes

MFC r309147:

Pull in r282174 from upstream llvm trunk (by Krzysztof Parzyszek):

  [PPC] Set SP after loading data from stack frame, if no red zone is
  present

  Follow-up to r280705: Make sure that the SP is only restored after
  all data is loaded from the stack frame, if there is no red zone.

  This completes the fix for
  https://llvm.org/bugs/show_bug.cgi?id=26519.

  Differential Revision: https://reviews.llvm.org/D24466

Reported by:    Mark Millard
PR:             214433

MFC r309149:

Pull in r283060 from upstream llvm trunk (by Hal Finkel):

  [PowerPC] Refactor soft-float support, and enable PPC64 soft float

  This change enables soft-float for PowerPC64, and also makes
  soft-float disable all vector instruction sets for both 32-bit and
  64-bit modes. This latter part is necessary because the PPC backend
  canonicalizes many Altivec vector types to floating-point types, and
  so soft-float breaks scalarization support for many operations. Both
  for embedded targets and for operating-system kernels desiring
  soft-float support, it seems reasonable that disabling hardware
  floating-point also disables vector instructions (embedded targets
  without hardware floating point support are unlikely to have Altivec,
  etc. and operating system kernels desiring not to use floating-point
  registers to lower syscall cost are unlikely to want to use vector
  registers either). If someone needs this to work, we'll need to
  change the fact that we promote many Altivec operations to act on
  v4f32. To make it possible to disable Altivec when soft-float is
  enabled, hardware floating-point support needs to be expressed as a
  positive feature, like the others, and not a negative feature,
  because target features cannot have dependencies on the disabling of
  some other feature. So +soft-float has now become -hard-float.

  Fixes PR26970.

Pull in r283061 from upstream clang trunk (by Hal Finkel):

  [PowerPC] Enable soft-float for PPC64, and +soft-float -> -hard-float

  Enable soft-float support on PPC64, as the backend now supports it.
  Also, the backend now uses -hard-float instead of +soft-float, so set
  the target features accordingly.

  Fixes PR26970.

Reported by:	Mark Millard
PR:		214433

MFC r309212:

Add a few missed clang 3.9.0 files to OptionalObsoleteFiles.

MFC r309262:

Fix packaging for clang, lldb and lld 3.9.0

During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.

Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package

Reviewed by:	gjb, jmallett
Differential Revision: https://reviews.freebsd.org/D8666

MFC r309656:

During the bootstrap phase, when building the minimal llvm library on
PowerPC, add lib/Support/Atomic.cpp.  This is needed because upstream
llvm revision r271821 disabled the use of std::call_once, which causes
some fallback functions from Atomic.cpp to be used instead.

Reported by:	Mark Millard
PR:		214902

MFC r309835:

Tentatively apply https://reviews.llvm.org/D18730 to work around gcc PR
70528 (bogus error: constructor required before non-static data member).
This should fix buildworld with the external gcc package.

Reported by:	https://jenkins.freebsd.org/job/FreeBSD_HEAD_amd64_gcc/

MFC r310194:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
3.9.1 release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/3.9.1/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/lld/docs/ReleaseNotes.html>

Relnotes:	yes

1 files changed, 454 insertions, 0 deletions

diff --git a/contrib/llvm/tools/clang/lib/Index/IndexDecl.cpp b/contrib/llvm/tools/clang/lib/Index/IndexDecl.cpp
new file mode 100644
index 0000000..eb3e151
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/Index/IndexDecl.cpp
@@ -0,0 +1,454 @@
+//===- IndexDecl.cpp - Indexing declarations ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IndexingContext.h"
+#include "clang/Index/IndexDataConsumer.h"
+#include "clang/AST/DeclVisitor.h"
+
+using namespace clang;
+using namespace index;
+
+#define TRY_TO(CALL_EXPR)                                                      \
+  do {                                                                         \
+    if (!CALL_EXPR)                                                            \
+      return false;                                                            \
+  } while (0)
+
+namespace {
+
+class IndexingDeclVisitor : public ConstDeclVisitor<IndexingDeclVisitor, bool> {
+  IndexingContext &IndexCtx;
+
+public:
+  explicit IndexingDeclVisitor(IndexingContext &indexCtx)
+    : IndexCtx(indexCtx) { }
+
+  bool Handled = true;
+
+  bool VisitDecl(const Decl *D) {
+    Handled = false;
+    return true;
+  }
+
+  /// \brief Returns true if the given method has been defined explicitly by the
+  /// user.
+  static bool hasUserDefined(const ObjCMethodDecl *D,
+                             const ObjCImplDecl *Container) {
+    const ObjCMethodDecl *MD = Container->getMethod(D->getSelector(),
+                                                    D->isInstanceMethod());
+    return MD && !MD->isImplicit() && MD->isThisDeclarationADefinition();
+  }
+
+  void handleDeclarator(const DeclaratorDecl *D,
+                        const NamedDecl *Parent = nullptr) {
+    if (!Parent) Parent = D;
+
+    IndexCtx.indexTypeSourceInfo(D->getTypeSourceInfo(), Parent);
+    IndexCtx.indexNestedNameSpecifierLoc(D->getQualifierLoc(), Parent);
+    if (IndexCtx.shouldIndexFunctionLocalSymbols()) {
+      // Only index parameters in definitions, parameters in declarations are
+      // not useful.
+      if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(D)) {
+        auto *DC = Parm->getDeclContext();
+        if (auto *FD = dyn_cast<FunctionDecl>(DC)) {
+          if (FD->isThisDeclarationADefinition())
+            IndexCtx.handleDecl(Parm);
+        } else if (auto *MD = dyn_cast<ObjCMethodDecl>(DC)) {
+          if (MD->isThisDeclarationADefinition())
+            IndexCtx.handleDecl(Parm);
+        } else {
+          IndexCtx.handleDecl(Parm);
+        }
+      } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+        if (FD->isThisDeclarationADefinition()) {
+          for (auto PI : FD->parameters()) {
+            IndexCtx.handleDecl(PI);
+          }
+        }
+      }
+    }
+  }
+
+  bool handleObjCMethod(const ObjCMethodDecl *D) {
+    if (!IndexCtx.handleDecl(D, (unsigned)SymbolRole::Dynamic))
+      return false;
+    IndexCtx.indexTypeSourceInfo(D->getReturnTypeSourceInfo(), D);
+    for (const auto *I : D->parameters())
+      handleDeclarator(I, D);
+
+    if (D->isThisDeclarationADefinition()) {
+      const Stmt *Body = D->getBody();
+      if (Body) {
+        IndexCtx.indexBody(Body, D, D);
+      }
+    }
+    return true;
+  }
+
+  bool VisitFunctionDecl(const FunctionDecl *D) {
+    if (D->isDeleted())
+      return true;
+
+    SymbolRoleSet Roles{};
+    SmallVector<SymbolRelation, 4> Relations;
+    if (auto *CXXMD = dyn_cast<CXXMethodDecl>(D)) {
+      if (CXXMD->isVirtual())
+        Roles |= (unsigned)SymbolRole::Dynamic;
+      for (auto I = CXXMD->begin_overridden_methods(),
+           E = CXXMD->end_overridden_methods(); I != E; ++I) {
+        Relations.emplace_back((unsigned)SymbolRole::RelationOverrideOf, *I);
+      }
+    }
+
+    if (!IndexCtx.handleDecl(D, Roles, Relations))
+      return false;
+    handleDeclarator(D);
+
+    if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D)) {
+      // Constructor initializers.
+      for (const auto *Init : Ctor->inits()) {
+        if (Init->isWritten()) {
+          IndexCtx.indexTypeSourceInfo(Init->getTypeSourceInfo(), D);
+          if (const FieldDecl *Member = Init->getAnyMember())
+            IndexCtx.handleReference(Member, Init->getMemberLocation(), D, D,
+                                     (unsigned)SymbolRole::Write);
+          IndexCtx.indexBody(Init->getInit(), D, D);
+        }
+      }
+    }
+
+    if (D->isThisDeclarationADefinition()) {
+      const Stmt *Body = D->getBody();
+      if (Body) {
+        IndexCtx.indexBody(Body, D, D);
+      }
+    }
+    return true;
+  }
+
+  bool VisitVarDecl(const VarDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    handleDeclarator(D);
+    IndexCtx.indexBody(D->getInit(), D);
+    return true;
+  }
+
+  bool VisitFieldDecl(const FieldDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    handleDeclarator(D);
+    if (D->isBitField())
+      IndexCtx.indexBody(D->getBitWidth(), D);
+    else if (D->hasInClassInitializer())
+      IndexCtx.indexBody(D->getInClassInitializer(), D);
+    return true;
+  }
+
+  bool VisitObjCIvarDecl(const ObjCIvarDecl *D) {
+    if (D->getSynthesize()) {
+      // For synthesized ivars, use the location of the ObjC implementation,
+      // not the location of the property.
+      // Otherwise the header file containing the @interface will have different
+      // indexing contents based on whether the @implementation was present or
+      // not in the translation unit.
+      return IndexCtx.handleDecl(D,
+                                 cast<Decl>(D->getDeclContext())->getLocation(),
+                                 (unsigned)SymbolRole::Implicit);
+    }
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    handleDeclarator(D);
+    return true;
+  }
+
+  bool VisitMSPropertyDecl(const MSPropertyDecl *D) {
+    handleDeclarator(D);
+    return true;
+  }
+
+  bool VisitEnumConstantDecl(const EnumConstantDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexBody(D->getInitExpr(), D);
+    return true;
+  }
+
+  bool VisitTypedefNameDecl(const TypedefNameDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexTypeSourceInfo(D->getTypeSourceInfo(), D);
+    return true;
+  }
+
+  bool VisitTagDecl(const TagDecl *D) {
+    // Non-free standing tags are handled in indexTypeSourceInfo.
+    if (D->isFreeStanding()) {
+      if (D->isThisDeclarationADefinition()) {
+        IndexCtx.indexTagDecl(D);
+      } else {
+        auto *Parent = dyn_cast<NamedDecl>(D->getDeclContext());
+        return IndexCtx.handleReference(D, D->getLocation(), Parent,
+                                        D->getLexicalDeclContext(),
+                                        SymbolRoleSet());
+      }
+    }
+    return true;
+  }
+
+  bool handleReferencedProtocols(const ObjCProtocolList &ProtList,
+                                 const ObjCContainerDecl *ContD) {
+    ObjCInterfaceDecl::protocol_loc_iterator LI = ProtList.loc_begin();
+    for (ObjCInterfaceDecl::protocol_iterator
+         I = ProtList.begin(), E = ProtList.end(); I != E; ++I, ++LI) {
+      SourceLocation Loc = *LI;
+      ObjCProtocolDecl *PD = *I;
+      TRY_TO(IndexCtx.handleReference(PD, Loc, ContD, ContD,
+          SymbolRoleSet(),
+          SymbolRelation{(unsigned)SymbolRole::RelationBaseOf, ContD}));
+    }
+    return true;
+  }
+
+  bool VisitObjCInterfaceDecl(const ObjCInterfaceDecl *D) {
+    if (D->isThisDeclarationADefinition()) {
+      TRY_TO(IndexCtx.handleDecl(D));
+      if (auto *SuperD = D->getSuperClass()) {
+        TRY_TO(IndexCtx.handleReference(SuperD, D->getSuperClassLoc(), D, D,
+            SymbolRoleSet(),
+            SymbolRelation{(unsigned)SymbolRole::RelationBaseOf, D}));
+      }
+      TRY_TO(handleReferencedProtocols(D->getReferencedProtocols(), D));
+      TRY_TO(IndexCtx.indexDeclContext(D));
+    } else {
+      return IndexCtx.handleReference(D, D->getLocation(), nullptr,
+                                      D->getDeclContext(), SymbolRoleSet());
+    }
+    return true;
+  }
+
+  bool VisitObjCProtocolDecl(const ObjCProtocolDecl *D) {
+    if (D->isThisDeclarationADefinition()) {
+      TRY_TO(IndexCtx.handleDecl(D));
+      TRY_TO(handleReferencedProtocols(D->getReferencedProtocols(), D));
+      TRY_TO(IndexCtx.indexDeclContext(D));
+    } else {
+      return IndexCtx.handleReference(D, D->getLocation(), nullptr,
+                                      D->getDeclContext(), SymbolRoleSet());
+    }
+    return true;
+  }
+
+  bool VisitObjCImplementationDecl(const ObjCImplementationDecl *D) {
+    const ObjCInterfaceDecl *Class = D->getClassInterface();
+    if (!Class)
+      return true;
+
+    if (Class->isImplicitInterfaceDecl())
+      IndexCtx.handleDecl(Class);
+
+    if (!IndexCtx.handleDecl(D))
+      return false;
+
+    // Index the ivars first to make sure the synthesized ivars are indexed
+    // before indexing the methods that can reference them.
+    for (const auto *IvarI : D->ivars())
+      IndexCtx.indexDecl(IvarI);
+    for (const auto *I : D->decls()) {
+      if (!isa<ObjCIvarDecl>(I))
+        IndexCtx.indexDecl(I);
+    }
+
+    return true;
+  }
+
+  bool VisitObjCCategoryDecl(const ObjCCategoryDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexDeclContext(D);
+    return true;
+  }
+
+  bool VisitObjCCategoryImplDecl(const ObjCCategoryImplDecl *D) {
+    const ObjCCategoryDecl *Cat = D->getCategoryDecl();
+    if (!Cat)
+      return true;
+
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexDeclContext(D);
+    return true;
+  }
+
+  bool VisitObjCMethodDecl(const ObjCMethodDecl *D) {
+    // Methods associated with a property, even user-declared ones, are
+    // handled when we handle the property.
+    if (D->isPropertyAccessor())
+      return true;
+
+    handleObjCMethod(D);
+    return true;
+  }
+
+  bool VisitObjCPropertyDecl(const ObjCPropertyDecl *D) {
+    if (ObjCMethodDecl *MD = D->getGetterMethodDecl())
+      if (MD->getLexicalDeclContext() == D->getLexicalDeclContext())
+        handleObjCMethod(MD);
+    if (ObjCMethodDecl *MD = D->getSetterMethodDecl())
+      if (MD->getLexicalDeclContext() == D->getLexicalDeclContext())
+        handleObjCMethod(MD);
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexTypeSourceInfo(D->getTypeSourceInfo(), D);
+    return true;
+  }
+
+  bool VisitObjCPropertyImplDecl(const ObjCPropertyImplDecl *D) {
+    ObjCPropertyDecl *PD = D->getPropertyDecl();
+    if (!IndexCtx.handleReference(PD, D->getLocation(),
+                             /*Parent=*/cast<NamedDecl>(D->getDeclContext()),
+                             D->getDeclContext(), SymbolRoleSet(), {},
+                             /*RefE=*/nullptr, D))
+      return false;
+
+    if (D->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      return true;
+    assert(D->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize);
+    
+    if (ObjCIvarDecl *IvarD = D->getPropertyIvarDecl()) {
+      if (!IvarD->getSynthesize())
+        IndexCtx.handleReference(IvarD, D->getPropertyIvarDeclLoc(), nullptr,
+                                 D->getDeclContext(), SymbolRoleSet());
+    }
+
+    auto *ImplD = cast<ObjCImplDecl>(D->getDeclContext());
+    if (ObjCMethodDecl *MD = PD->getGetterMethodDecl()) {
+      if (MD->isPropertyAccessor() &&
+          !hasUserDefined(MD, ImplD))
+        IndexCtx.handleDecl(MD, D->getLocation(), SymbolRoleSet(), {}, ImplD);
+    }
+    if (ObjCMethodDecl *MD = PD->getSetterMethodDecl()) {
+      if (MD->isPropertyAccessor() &&
+          !hasUserDefined(MD, ImplD))
+        IndexCtx.handleDecl(MD, D->getLocation(), SymbolRoleSet(), {}, ImplD);
+    }
+    return true;
+  }
+
+  bool VisitNamespaceDecl(const NamespaceDecl *D) {
+    if (!IndexCtx.handleDecl(D))
+      return false;
+    IndexCtx.indexDeclContext(D);
+    return true;
+  }
+
+  bool VisitUsingDecl(const UsingDecl *D) {
+    const DeclContext *DC = D->getDeclContext()->getRedeclContext();
+    const NamedDecl *Parent = dyn_cast<NamedDecl>(DC);
+
+    IndexCtx.indexNestedNameSpecifierLoc(D->getQualifierLoc(), Parent,
+                                         D->getLexicalDeclContext());
+    for (const auto *I : D->shadows())
+      IndexCtx.handleReference(I->getUnderlyingDecl(), D->getLocation(), Parent,
+                               D->getLexicalDeclContext(), SymbolRoleSet());
+    return true;
+  }
+
+  bool VisitUsingDirectiveDecl(const UsingDirectiveDecl *D) {
+    const DeclContext *DC = D->getDeclContext()->getRedeclContext();
+    const NamedDecl *Parent = dyn_cast<NamedDecl>(DC);
+
+    IndexCtx.indexNestedNameSpecifierLoc(D->getQualifierLoc(), Parent,
+                                         D->getLexicalDeclContext());
+    return IndexCtx.handleReference(D->getNominatedNamespaceAsWritten(),
+                                    D->getLocation(), Parent,
+                                    D->getLexicalDeclContext(),
+                                    SymbolRoleSet());
+  }
+
+  bool VisitClassTemplateSpecializationDecl(const
+                                           ClassTemplateSpecializationDecl *D) {
+    // FIXME: Notify subsequent callbacks if info comes from implicit
+    // instantiation.
+    if (D->isThisDeclarationADefinition())
+      IndexCtx.indexTagDecl(D);
+    return true;
+  }
+
+  bool VisitTemplateDecl(const TemplateDecl *D) {
+    // FIXME: Template parameters.
+    return Visit(D->getTemplatedDecl());
+  }
+
+  bool VisitFriendDecl(const FriendDecl *D) {
+    if (auto ND = D->getFriendDecl()) {
+      // FIXME: Ignore a class template in a dependent context, these are not
+      // linked properly with their redeclarations, ending up with duplicate
+      // USRs.
+      // See comment "Friend templates are visible in fairly strange ways." in
+      // SemaTemplate.cpp which precedes code that prevents the friend template
+      // from becoming visible from the enclosing context.
+      if (isa<ClassTemplateDecl>(ND) && D->getDeclContext()->isDependentContext())
+        return true;
+      return Visit(ND);
+    }
+    if (auto Ty = D->getFriendType()) {
+      IndexCtx.indexTypeSourceInfo(Ty, cast<NamedDecl>(D->getDeclContext()));
+    }
+    return true;
+  }
+
+  bool VisitImportDecl(const ImportDecl *D) {
+    return IndexCtx.importedModule(D);
+  }
+};
+
+} // anonymous namespace
+
+bool IndexingContext::indexDecl(const Decl *D) {
+  if (D->isImplicit() && shouldIgnoreIfImplicit(D))
+    return true;
+
+  if (isTemplateImplicitInstantiation(D))
+    return true;
+
+  IndexingDeclVisitor Visitor(*this);
+  bool ShouldContinue = Visitor.Visit(D);
+  if (!ShouldContinue)
+    return false;
+
+  if (!Visitor.Handled && isa<DeclContext>(D))
+    return indexDeclContext(cast<DeclContext>(D));
+
+  return true;
+}
+
+bool IndexingContext::indexDeclContext(const DeclContext *DC) {
+  for (const auto *I : DC->decls())
+    if (!indexDecl(I))
+      return false;
+  return true;
+}
+
+bool IndexingContext::indexTopLevelDecl(const Decl *D) {
+  if (D->getLocation().isInvalid())
+    return true;
+
+  if (isa<ObjCMethodDecl>(D))
+    return true; // Wait for the objc container.
+
+  return indexDecl(D);
+}
+
+bool IndexingContext::indexDeclGroupRef(DeclGroupRef DG) {
+  for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
+    if (!indexTopLevelDecl(*I))
+      return false;
+  return true;
+}