[OPENMP] Codegen for `omp declare target` construct.

Added initial codegen for device side of declarations inside `omp
declare target` construct + codegen for implicit `declare target`
functions, which are used in the target regions.

llvm-svn: 327636

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.h b/clang/lib/CodeGen/CGOpenMPRuntime.h
index 0f18d13296f..410241b6189 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.h
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.h
@@ -199,6 +199,18 @@ public:
 };
 
 class CGOpenMPRuntime {
+public:
+  /// Allows to disable automatic handling of functions used in target regions
+  /// as those marked as `omp declare target`.
+  class DisableAutoDeclareTargetRAII {
+    CodeGenModule &CGM;
+    bool SavedShouldMarkAsGlobal;
+
+  public:
+    DisableAutoDeclareTargetRAII(CodeGenModule &CGM);
+    ~DisableAutoDeclareTargetRAII();
+  };
+
 protected:
   CodeGenModule &CGM;
 
@@ -488,6 +500,9 @@ private:
   };
   OffloadEntriesInfoManagerTy OffloadEntriesInfoManager;
 
+  bool ShouldMarkAsGlobal = true;
+  llvm::SmallDenseSet<const FunctionDecl *> AlreadyEmittedTargetFunctions;
+
   /// \brief Creates and registers offloading binary descriptor for the current
   /// compilation unit. The function that does the registration is returned.
   llvm::Function *createOffloadingBinaryDescriptorRegistration();
@@ -1370,6 +1385,11 @@ public:
   /// Gets the OpenMP-specific address of the local variable.
   virtual Address getAddressOfLocalVariable(CodeGenFunction &CGF,
                                             const VarDecl *VD);
+
+  /// Marks the declaration as alread emitted for the device code and returns
+  /// true, if it was marked already, and false, otherwise.
+  bool markAsGlobalTarget(const FunctionDecl *D);
+
 };
 
 /// Class supports emissionof SIMD-only code.