[OPENMP] Codegen for 'firstprivate' clause.

This patch generates some helper variables that used as private copies of the corresponding original variables inside an OpenMP 'parallel' directive. These generated variables are initialized by copy using values of the original variables (with the copy constructor, if any). For arrays, initializator is generated for single element and in the codegen procedure this initial value is automatically propagated between all elements of the private copy.
In outlined function, references to original variables are replaced by the references to these private helper variables. At the end of the initialization of the private variables an implicit barier is generated by calling __kmpc_barrier(...) runtime function to be sure that all threads were initialized using original values of the variables.
Differential Revision: http://reviews.llvm.org/D5140

llvm-svn: 219306

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index a4b231dd..e471f15 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -113,6 +113,7 @@ class CodeGenFunction : public CodeGenTypeCache {
   void operator=(const CodeGenFunction &) LLVM_DELETED_FUNCTION;
 
   friend class CGCXXABI;
+  friend class CGOpenMPRegionInfo;
 public:
   /// A jump destination is an abstract label, branching to which may
   /// require a jump out through normal cleanups.
@@ -1826,6 +1827,10 @@ public:
   typedef void SpecialInitFn(CodeGenFunction &Init, const VarDecl &D,
                              llvm::Value *Address);
 
+  /// \brief Determine whether the given initializer is trivial in the sense
+  /// that it requires no code to be generated.
+  bool isTrivialInitializer(const Expr *Init);
+
   /// EmitAutoVarDecl - Emit an auto variable declaration.
   ///
   /// This function can be called with a null (unreachable) insert point.
@@ -1991,8 +1996,16 @@ public:
                            ArrayRef<const Attr *> Attrs = None);
 
   llvm::Function *EmitCapturedStmt(const CapturedStmt &S, CapturedRegionKind K);
+  void GenerateCapturedStmtFunctionProlog(const CapturedStmt &S);
+  llvm::Function *GenerateCapturedStmtFunctionEpilog(const CapturedStmt &S);
   llvm::Function *GenerateCapturedStmtFunction(const CapturedStmt &S);
   llvm::Value *GenerateCapturedStmtArgument(const CapturedStmt &S);
+  typedef llvm::DenseMap<const Decl *, llvm::Value *> OuterDeclMapTy;
+  void EmitOMPAggregateAssign(LValue OriginalAddr, llvm::Value *PrivateAddr,
+                              const Expr *AssignExpr, QualType Type,
+                              const VarDecl *VDInit);
+  void EmitOMPFirstprivateClause(const OMPExecutableDirective &D,
+                                 OuterDeclMapTy &OuterDeclMap);
 
   void EmitOMPParallelDirective(const OMPParallelDirective &S);
   void EmitOMPSimdDirective(const OMPSimdDirective &S);