[CUDA][HIP] support __noinline__ as keyword

CUDA/HIP programs use __noinline__ like a keyword e.g.
__noinline__ void foo() {} since __noinline__ is defined
as a macro __attribute__((noinline)) in CUDA/HIP runtime
header files.

However, gcc and clang supports __attribute__((__noinline__))
the same as __attribute__((noinline)). Some C++ libraries
use __attribute__((__noinline__)) in their header files.
When CUDA/HIP programs include such header files,
clang will emit error about invalid attributes.

This patch fixes this issue by supporting __noinline__ as
a keyword, so that CUDA/HIP runtime could remove
the macro definition.

Reviewed by: Aaron Ballman, Artem Belevich

Differential Revision: https://reviews.llvm.org/D124866

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 8d6e84b..89e13cf 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -897,6 +897,15 @@ void Parser::ParseOpenCLKernelAttributes(ParsedAttributes &attrs) {
   }
 }
 
+void Parser::ParseCUDAFunctionAttributes(ParsedAttributes &attrs) {
+  while (Tok.is(tok::kw___noinline__)) {
+    IdentifierInfo *AttrName = Tok.getIdentifierInfo();
+    SourceLocation AttrNameLoc = ConsumeToken();
+    attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
+                 ParsedAttr::AS_Keyword);
+  }
+}
+
 void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) {
   IdentifierInfo *AttrName = Tok.getIdentifierInfo();
   SourceLocation AttrNameLoc = Tok.getLocation();
@@ -3690,6 +3699,11 @@ void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
       ParseOpenCLKernelAttributes(DS.getAttributes());
       continue;
 
+    // CUDA/HIP single token adornments.
+    case tok::kw___noinline__:
+      ParseCUDAFunctionAttributes(DS.getAttributes());
+      continue;
+
     // Nullability type specifiers.
     case tok::kw__Nonnull:
     case tok::kw__Nullable: