[PATCH] D25796: [CUDA] Create __host__ and device variants of standard allocator declarations.

[Artem Belevich via cfe-commits]

tra created this revision.
tra added a reviewer: jlebar.
tra added a subscriber: cfe-commits.

Implicit functions are treated as if they were __host__ __device__ and clang does not allow overloading 
those with __host__ or __device__ variants.

In order for users to provide their own standard allocators, we must create __host__ and __device__ variants of these declarations during CUDA compilation.


https://reviews.llvm.org/D25796

Files:
  lib/Sema/SemaExprCXX.cpp


Index: lib/Sema/SemaExprCXX.cpp
===================================================================
--- lib/Sema/SemaExprCXX.cpp
+++ lib/Sema/SemaExprCXX.cpp
@@ -2593,28 +2593,40 @@
         getLangOpts().CPlusPlus11 ? EST_BasicNoexcept : EST_DynamicNone;
   }
 
-  QualType FnType = Context.getFunctionType(Return, Params, EPI);
-  FunctionDecl *Alloc =
-    FunctionDecl::Create(Context, GlobalCtx, SourceLocation(),
-                         SourceLocation(), Name,
-                         FnType, /*TInfo=*/nullptr, SC_None, false, true);
-  Alloc->setImplicit();
+  auto CreateAllocationFunctionDecl = [&]() {
+    QualType FnType = Context.getFunctionType(Return, Params, EPI);
+    FunctionDecl *Alloc = FunctionDecl::Create(
+        Context, GlobalCtx, SourceLocation(), SourceLocation(), Name,
+        FnType, /*TInfo=*/nullptr, SC_None, false, true);
+    Alloc->setImplicit();
 
-  // Implicit sized deallocation functions always have default visibility.
-  Alloc->addAttr(VisibilityAttr::CreateImplicit(Context,
-                                                VisibilityAttr::Default));
+    // Implicit sized deallocation functions always have default visibility.
+    Alloc->addAttr(
+        VisibilityAttr::CreateImplicit(Context, VisibilityAttr::Default));
 
-  llvm::SmallVector<ParmVarDecl*, 3> ParamDecls;
-  for (QualType T : Params) {
-    ParamDecls.push_back(
-        ParmVarDecl::Create(Context, Alloc, SourceLocation(), SourceLocation(),
-                            nullptr, T, /*TInfo=*/nullptr, SC_None, nullptr));
-    ParamDecls.back()->setImplicit();
-  }
-  Alloc->setParams(ParamDecls);
+    llvm::SmallVector<ParmVarDecl *, 3> ParamDecls;
+    for (QualType T : Params) {
+      ParamDecls.push_back(ParmVarDecl::Create(
+          Context, Alloc, SourceLocation(), SourceLocation(), nullptr, T,
+          /*TInfo=*/nullptr, SC_None, nullptr));
+      ParamDecls.back()->setImplicit();
+    }
+    Alloc->setParams(ParamDecls);
+    return Alloc;
+  };
 
+  FunctionDecl *Alloc = CreateAllocationFunctionDecl();
+  if (LangOpts.CUDA)
+    Alloc->addAttr(CUDAHostAttr::CreateImplicit(Context));
   Context.getTranslationUnitDecl()->addDecl(Alloc);
   IdResolver.tryAddTopLevelDecl(Alloc, Name);
+
+  if (LangOpts.CUDA) {
+    Alloc = CreateAllocationFunctionDecl();
+    Alloc->addAttr(CUDADeviceAttr::CreateImplicit(Context));
+    Context.getTranslationUnitDecl()->addDecl(Alloc);
+    IdResolver.tryAddTopLevelDecl(Alloc, Name);
+  }
 }
 
 FunctionDecl *Sema::FindUsualDeallocationFunction(SourceLocation StartLoc,


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