Add the notion of deferred diagnostics.

Summary:
This patch lets you create diagnostics that are emitted if and only if a
particular FunctionDecl is codegen'ed.

This is necessary for CUDA, where some constructs -- e.g. calls from
host+device functions to host functions when compiling for device -- are
allowed to appear in semantically-correct programs, but only if they're
never codegen'ed.

Reviewers: rnk

Subscribers: cfe-commits, tra

Differential Revision: https://reviews.llvm.org/D23241

llvm-svn: 278735

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 4486cb89404..98711822a51 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -3446,6 +3446,20 @@ unsigned FunctionDecl::getMemoryFunctionKind() const {
   return 0;
 }
 
+void FunctionDecl::addDeferredDiag(PartialDiagnosticAt PD) {
+  getASTContext().getDeferredDiags()[this].push_back(std::move(PD));
+}
+
+std::vector<PartialDiagnosticAt> FunctionDecl::takeDeferredDiags() const {
+  auto &DD = getASTContext().getDeferredDiags();
+  auto It = DD.find(this);
+  if (It == DD.end())
+    return {};
+  auto Ret = std::move(It->second);
+  DD.erase(It);
+  return Ret;
+}
+
 //===----------------------------------------------------------------------===//
 // FieldDecl Implementation
 //===----------------------------------------------------------------------===//