Concurrency support for PNaCl ABI

include/llvm/IR/NaCl.h

+//===-- llvm/IR/NaCl.h - NaCl Intrinsic Function Handling -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a set of enums which allow processing of intrinsic
+// functions that are specific to NaCl. The order of these enums should
+// not change: they offer forward compatibility of bitcode targeted to
+// NaCl.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_NACL_H
+#define LLVM_IR_NACL_H
+
+#include "llvm/IR/Intrinsics.h"
+
+namespace llvm {
+
+namespace NaCl {
+
+const struct {
+  Intrinsic::ID ID;
+  unsigned BitSize;
+} AtomicIntrinsics[] = {
+  { Intrinsic::nacl_atomic_8,   8 },
+  { Intrinsic::nacl_atomic_16, 16 },
+  { Intrinsic::nacl_atomic_32, 32 },
+  { Intrinsic::nacl_atomic_64, 64 }
+};
+
+enum {
+  NumAtomicIntrinsics = sizeof(AtomicIntrinsics) / sizeof(AtomicIntrinsics[0])
+};
+
+// Operations that can be represented by the nacl.atomic.<size> intrinsics.
+enum AtomicOperation {
+  AtomicInvalid = 0, // Invalid, keep first.
+  AtomicLoad,
+  AtomicStore,
+  AtomicAdd,
+  AtomicSub,
+  AtomicOr,
+  AtomicAnd,
+  AtomicXor,
+  AtomicXchg,
+  AtomicCmpXchg,
+  AtomicFence,
+  AtomicNum // Invalid, keep last.
+};
+
+// Memory orderings supported by C11/C++11.
+enum MemoryOrder {
+  MemoryOrderInvalid = 0, // Invalid, keep first.
+  MemoryOrderRelaxed,
+  MemoryOrderConsume,
+  MemoryOrderAcquire,
+  MemoryOrderRelease,
+  MemoryOrderAcquireRelease,
+  MemoryOrderSequentiallyConsistent,
+  MemoryOrderNum // Invalid, keep last.
+};
+
+} // End NaCl namespace
+
+} // End llvm namespace
+
+#endif