Revert "Fix linkage of 'static inline' Clang-imported definitions"

This reverts commit r31763, as it was breaking the bots:

Swift SVN r31765

include/swift/SIL/SILDeclRef.h

@@ -348,14 +348,10 @@ struct SILDeclRef {
   /// True if the referenced entity is some kind of thunk.
   bool isThunk() const;
 
-  /// True if the referenced entity is emitted by Swift on behalf of the Clang
+  /// True if the referenced entity is generated on behalf of the Clang
   /// importer.
   bool isClangImported() const;
 
-  /// True if the referenced entity is emitted by Clang on behalf of the Clang
-  /// importer.
-  bool isClangGenerated() const;
-
   bool isImplicit() const {
     if (hasDecl())
       return getDecl()->isImplicit();

include/swift/SIL/SILFunction.h

@@ -120,13 +120,11 @@ private:
   /// The linkage of the function.
   unsigned Linkage : NumSILLinkageBits;
 
-  /// This flag indicates if a function can be eliminated by dead function
-  /// elimination. If it is unset, DFE will preserve the function and make
-  /// it public.
-  unsigned KeepAsPublic : 1;
-
-  /// This flag indicates if a function has a body generated by Clang.
-  unsigned ForeignBody : 1;
+  /// This flags indicates if a function can be
+  /// eliminated by dead function elimination.
+  /// If it is unset, DFE will preserve the function
+  /// and make it public.
+  unsigned KeepAsPublic: 1;
 
   /// This is the number of uses of this SILFunction inside the SIL.
   /// It does not include references from debug scopes.
@@ -423,10 +421,6 @@ public:
   bool isKeepAsPublic() const { return KeepAsPublic; }
   void setKeepAsPublic(bool keep) { KeepAsPublic = keep; }
 
-  /// Get this function's foreign body attribute.
-  HasForeignBody_t hasForeignBody() const { return HasForeignBody_t(ForeignBody); }
-  void setForeignBody(HasForeignBody_t foreign) { ForeignBody = foreign; }
-
   /// Retrieve the generic parameter list containing the contextual archetypes
   /// of the function.
   ///

include/swift/SIL/SILLinkage.h

@@ -84,18 +84,12 @@ enum {
   NumSILLinkageBits = 3
 };
 
-/// Related to linkage: flag if a function or global variable is fragile.
+/// Reslated to linkage: flag if a function or global variable is fragle.
 enum IsFragile_t {
   IsNotFragile,
   IsFragile
 };
   
-/// True if we have an inline body generated by Clang.
-enum HasForeignBody_t {
-  DoesNotHaveForeignBody,
-  HasForeignBody
-};
-
 /// Strip external from public_external, hidden_external. Otherwise just return
 /// the linkage.
 inline SILLinkage stripExternalFromLinkage(SILLinkage linkage) {

lib/SIL/SILDeclRef.cpp

@@ -215,9 +215,6 @@ bool SILDeclRef::isClangImported() const {
   DeclContext *moduleContext = d->getDeclContext()->getModuleScopeContext();
 
   if (isa<ClangModuleUnit>(moduleContext)) {
-    if (isClangGenerated())
-      return true;
-
     if (isa<ConstructorDecl>(d) || isa<EnumElementDecl>(d))
       return true;
 
@@ -229,21 +226,6 @@ bool SILDeclRef::isClangImported() const {
   return false;
 }
 
-bool SILDeclRef::isClangGenerated() const {
-  if (!hasDecl())
-    return false;
-
-  if (auto *FD = dyn_cast<FuncDecl>(getDecl())) {
-    auto clangNode = FD->getClangNode().getAsDecl();
-    if (auto fd = dyn_cast_or_null<clang::FunctionDecl>(clangNode)) {
-      if (fd->hasBody())
-        return true;
-    }
-  }
-
-  return false;
-}
-
 SILLinkage SILDeclRef::getLinkage(ForDefinition_t forDefinition) const {
   // Anonymous functions have local linkage.
   if (auto closure = getAbstractClosureExpr())

lib/SIL/SILFunction.cpp

@@ -89,7 +89,6 @@ SILFunction::SILFunction(SILModule &Module, SILLinkage Linkage,
     InlineStrategy(inlineStrategy),
     Linkage(unsigned(Linkage)),
     KeepAsPublic(false),
-    ForeignBody(false),
     EK(E) {
   if (InsertBefore)
     Module.functions.insert(SILModule::iterator(InsertBefore), this);

lib/SIL/SILModule.cpp

@@ -359,14 +359,10 @@ SILFunction *SILModule::getOrCreateFunction(SILLocation loc,
     F->setDebugScope(new (*this) SILDebugScope(loc, *F));
 
   F->setGlobalInit(constant.isGlobal());
-  if (constant.hasDecl()) {
-    if (constant.isForeign && constant.isClangGenerated())
-      F->setForeignBody(HasForeignBody);
-
+  if (constant.hasDecl())
     if (auto SemanticsA =
         constant.getDecl()->getAttrs().getAttribute<SemanticsAttr>())
       F->setSemanticsAttr(SemanticsA->Value);
-  }
 
   F->setDeclContext(constant.hasDecl() ? constant.getDecl() : nullptr);
 

lib/SIL/Verifier.cpp

@@ -2947,21 +2947,16 @@ public:
     verifySILFunctionType(FTy);
 
     if (F->isExternalDeclaration()) {
-      if (F->hasForeignBody())
-        return;
-
       assert(F->isAvailableExternally() &&
              "external declaration of internal SILFunction not allowed");
       assert(!hasSharedVisibility(F->getLinkage()) &&
-             "external declarations of SILFunctions with shared visibility is not "
+             "external declarations of SILFunctions with shared visiblity is not "
              "allowed");
       // If F is an external declaration, there is nothing further to do,
       // return.
       return;
     }
 
-    assert(!F->hasForeignBody());
-
     // Make sure that our SILFunction only has context generic params if our
     // SILFunctionType is non-polymorphic.
     if (F->getContextGenericParams()) {

test/IRGen/c_globals.swift

@@ -6,7 +6,7 @@ import c_layout
 func blackHole<T>(t: T) { }
 
 // CHECK: @staticFloat = internal global float 1.700000e+01, align 4
-// CHECK: define internal void @doubleTrouble() [[CLANG_FUNC_ATTR:#[0-9]+]] {
+// CHECK: define {{.*}}void @doubleTrouble() [[CLANG_FUNC_ATTR:#[0-9]+]] {
 
 public func testStaticGlobal() {
   blackHole(c_layout.staticFloat)

test/SILGen/Inputs/usr/include/Ansible.h

@@ -4,14 +4,8 @@
 - (Ansible*)initWithBellsOn:(id)theBells;
 @end
 
-static Ansible *NSAnse(Ansible *x) {
-  return x;
-}
-
-Ansible *NSAnseExternal(Ansible *x) {
+Ansible *NSAnse(Ansible *x) {
   return x;
 }
 
 void hasNoPrototype();
-
-static void staticForwardDeclaration(void);