Implement the __builtin_call_with_static_chain GNU extension.

The extension has the following syntax:

  __builtin_call_with_static_chain(Call, Chain)
  where Call must be a function call expression and Chain must be of pointer type

This extension performs a function call Call with a static chain pointer
Chain passed to the callee in a designated register. This is useful for
calling foreign language functions whose ABI uses static chain pointers
(e.g. to implement closures).

Differential Revision: http://reviews.llvm.org/D6332

llvm-svn: 224167

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/test/Sema/call-with-static-chain.c b/clang/test/Sema/call-with-static-chain.c
new file mode 100644
index 00000000000..4a076d2ecf9
--- /dev/null
+++ b/clang/test/Sema/call-with-static-chain.c
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -fsyntax-only -fblocks -verify %s
+
+void f();
+
+void g() {
+  __builtin_call_with_static_chain(f(), f);
+  __builtin_call_with_static_chain(f, f); // expected-error {{first argument to __builtin_call_with_static_chain must be a non-member call expression}}
+  __builtin_call_with_static_chain(^{}(), f); // expected-error {{first argument to __builtin_call_with_static_chain must not be a block call}}
+  __builtin_call_with_static_chain(__builtin_unreachable(), f); // expected-error {{first argument to __builtin_call_with_static_chain must not be a builtin call}}
+  __builtin_call_with_static_chain(f(), 42); // expected-error {{second argument to __builtin_call_with_static_chain must be of pointer type}}
+}