[PATCH] D60193: [OpenCL] Added addrspace_cast operator

[Anastasia Stulova via Phabricator via cfe-commits]

Anastasia created this revision.
Anastasia added reviewers: rjmccall, ebevhan.
Herald added a subscriber: yaxunl.

This change adds extra cast operator `addrspace_cast` described earlier in this RFC:
http://lists.llvm.org/pipermail/cfe-dev/2018-December/060546.html

This operator is intended for casting between pointers to objects in different address spaces and follows similar logic as `const_cast` in C++.

Example:

  int* gen = ...;
  global int* gl = addrspace_cast<global int*>(gen);

Note that functionality of casting pointers to different address spaces has been previously removed from all other cast operators and can only be currently done using C style casts.

This commit only enables this change for OpenCL, but if agreed it can be changed to apply to C++ too (it needs to be enabled as a valid keyword). However, for C++ it might need to be added as a Clang only extension?


https://reviews.llvm.org/D60193

Files:
  include/clang/AST/ExprCXX.h
  include/clang/AST/RecursiveASTVisitor.h
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/StmtNodes.td
  include/clang/Basic/TokenKinds.def
  include/clang/Serialization/ASTBitCodes.h
  lib/AST/Expr.cpp
  lib/AST/ExprCXX.cpp
  lib/AST/ExprClassification.cpp
  lib/AST/ExprConstant.cpp
  lib/AST/ItaniumMangle.cpp
  lib/AST/StmtPrinter.cpp
  lib/AST/StmtProfile.cpp
  lib/CodeGen/CGExpr.cpp
  lib/Parse/ParseExpr.cpp
  lib/Parse/ParseExprCXX.cpp
  lib/Sema/SemaCast.cpp
  lib/Sema/SemaExceptionSpec.cpp
  lib/Sema/TreeTransform.h
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriter.cpp
  lib/Serialization/ASTWriterStmt.cpp
  test/CodeGenOpenCLCXX/addrspace_cast.cl
  test/SemaOpenCLCXX/addrspace_cast.cl
  test/SemaOpenCLCXX/addrspace_cast_ast_dump.cl

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