From 06d4ba388873e6d1cfa9cd715a8935ecc8cd2097 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 18 Jan 2015 16:23:48 +0000
Subject: Vendor import of clang RELEASE_360/rc1 tag r226102 (effectively,
 3.6.0 RC1): https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_360/rc1@226102

---
 lib/CodeGen/ModuleBuilder.cpp | 66 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 52 insertions(+), 14 deletions(-)

(limited to 'lib/CodeGen/ModuleBuilder.cpp')

diff --git a/lib/CodeGen/ModuleBuilder.cpp b/lib/CodeGen/ModuleBuilder.cpp
index c5d18d3286a7b..4f1a82e0248dc 100644
--- a/lib/CodeGen/ModuleBuilder.cpp
+++ b/lib/CodeGen/ModuleBuilder.cpp
@@ -33,17 +33,41 @@ namespace {
     std::unique_ptr<const llvm::DataLayout> TD;
     ASTContext *Ctx;
     const CodeGenOptions CodeGenOpts;  // Intentionally copied in.
+
+    unsigned HandlingTopLevelDecls;
+    struct HandlingTopLevelDeclRAII {
+      CodeGeneratorImpl &Self;
+      HandlingTopLevelDeclRAII(CodeGeneratorImpl &Self) : Self(Self) {
+        ++Self.HandlingTopLevelDecls;
+      }
+      ~HandlingTopLevelDeclRAII() {
+        if (--Self.HandlingTopLevelDecls == 0)
+          Self.EmitDeferredDecls();
+      }
+    };
+
+    CoverageSourceInfo *CoverageInfo;
+
   protected:
     std::unique_ptr<llvm::Module> M;
     std::unique_ptr<CodeGen::CodeGenModule> Builder;
 
+  private:
+    SmallVector<CXXMethodDecl *, 8> DeferredInlineMethodDefinitions;
+
   public:
     CodeGeneratorImpl(DiagnosticsEngine &diags, const std::string& ModuleName,
-                      const CodeGenOptions &CGO, llvm::LLVMContext& C)
-      : Diags(diags), CodeGenOpts(CGO),
+                      const CodeGenOptions &CGO, llvm::LLVMContext& C,
+                      CoverageSourceInfo *CoverageInfo = nullptr)
+      : Diags(diags), Ctx(nullptr), CodeGenOpts(CGO), HandlingTopLevelDecls(0),
+        CoverageInfo(CoverageInfo),
         M(new llvm::Module(ModuleName, C)) {}
 
-    virtual ~CodeGeneratorImpl() {}
+    virtual ~CodeGeneratorImpl() {
+      // There should normally not be any leftover inline method definitions.
+      assert(DeferredInlineMethodDefinitions.empty() ||
+             Diags.hasErrorOccurred());
+    }
 
     llvm::Module* GetModule() override {
       return M.get();
@@ -73,7 +97,7 @@ namespace {
       M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
       TD.reset(new llvm::DataLayout(Ctx->getTargetInfo().getTargetDescription()));
       Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts, *M, *TD,
-                                               Diags));
+                                               Diags, CoverageInfo));
 
       for (size_t i = 0, e = CodeGenOpts.DependentLibraries.size(); i < e; ++i)
         HandleDependentLibrary(CodeGenOpts.DependentLibraries[i]);
@@ -90,18 +114,28 @@ namespace {
       if (Diags.hasErrorOccurred())
         return true;
 
+      HandlingTopLevelDeclRAII HandlingDecl(*this);
+
       // Make sure to emit all elements of a Decl.
       for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
         Builder->EmitTopLevelDecl(*I);
 
-      // Emit any deferred inline method definitions.
-      for (CXXMethodDecl *MD : DeferredInlineMethodDefinitions)
-        Builder->EmitTopLevelDecl(MD);
-      DeferredInlineMethodDefinitions.clear();
-
       return true;
     }
 
+    void EmitDeferredDecls() {
+      if (DeferredInlineMethodDefinitions.empty())
+        return;
+
+      // Emit any deferred inline method definitions. Note that more deferred
+      // methods may be added during this loop, since ASTConsumer callbacks
+      // can be invoked if AST inspection results in declarations being added.
+      HandlingTopLevelDeclRAII HandlingDecl(*this);
+      for (unsigned I = 0; I != DeferredInlineMethodDefinitions.size(); ++I)
+        Builder->EmitTopLevelDecl(DeferredInlineMethodDefinitions[I]);
+      DeferredInlineMethodDefinitions.clear();
+    }
+
     void HandleInlineMethodDefinition(CXXMethodDecl *D) override {
       if (Diags.hasErrorOccurred())
         return;
@@ -117,6 +151,12 @@ namespace {
       //     void foo() { bar(); }
       //   } A;
       DeferredInlineMethodDefinitions.push_back(D);
+
+      // Provide some coverage mapping even for methods that aren't emitted.
+      // Don't do this for templated classes though, as they may not be
+      // instantiable.
+      if (!D->getParent()->getDescribedClassTemplate())
+        Builder->AddDeferredUnusedCoverageMapping(D);
     }
 
     /// HandleTagDeclDefinition - This callback is invoked each time a TagDecl
@@ -190,9 +230,6 @@ namespace {
     void HandleDependentLibrary(llvm::StringRef Lib) override {
       Builder->AddDependentLib(Lib);
     }
-
-  private:
-    std::vector<CXXMethodDecl *> DeferredInlineMethodDefinitions;
   };
 }
 
@@ -202,6 +239,7 @@ CodeGenerator *clang::CreateLLVMCodeGen(DiagnosticsEngine &Diags,
                                         const std::string& ModuleName,
                                         const CodeGenOptions &CGO,
                                         const TargetOptions &/*TO*/,
-                                        llvm::LLVMContext& C) {
-  return new CodeGeneratorImpl(Diags, ModuleName, CGO, C);
+                                        llvm::LLVMContext& C,
+                                        CoverageSourceInfo *CoverageInfo) {
+  return new CodeGeneratorImpl(Diags, ModuleName, CGO, C, CoverageInfo);
 }
-- 
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