Add a few Subzero intrinsics (not the atomic ones yet).

src/IceIntrinsics.h

Index: src/IceIntrinsics.h
diff --git a/src/IceIntrinsics.h b/src/IceIntrinsics.h
new file mode 100644
index 0000000000000000000000000000000000000000..4f9f7ded0423dd0cf5ca31607434494e43e4ede4
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+++ b/src/IceIntrinsics.h
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+//===- subzero/src/IceIntrinsics.h - List of Ice Intrinsics -----*- C++ -*-===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the kinds of intrinsics supported by PNaCl.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICEINTRINSICS_H
+#define SUBZERO_SRC_ICEINTRINSICS_H
+
+#include "IceDefs.h"
+
+namespace Ice {
+
+static const size_t kMaxIntrinsicParameters = 6;
+
+class Intrinsics {
+public:
+  Intrinsics();
+  ~Intrinsics();
+
+  // Some intrinsics allow overloading by type. This enum collapses all
+  // overloads into a single ID, but the type can still be recovered by the
+  // type of the intrinsic function call's return value and parameters.
+  enum IntrinsicID {
+    UnknownIntrinsic = 0,
+    // Arbitrary (alphabetical) order.
+    AtomicCmpxchg,
+    AtomicFence,
+    AtomicFenceAll,
+    AtomicIsLockFree,
+    AtomicLoad,
+    AtomicRMW,
+    AtomicStore,
+    Bswap,
+    Ctlz,
+    Ctpop,
+    Cttz,
+    Longjmp,
+    Memcpy,
+    Memmove,
+    Memset,
+    NaClReadTP,
+    Setjmp,
+    Sqrt,
+    Stacksave,
+    Stackrestore,
+    Trap
+  };
+
+  // Basic attributes related to each intrinsic, that are relevant to
+  // code generation. We will want to have more attributes (e.g., Setjmp
+  // returns twice and which affects stack coloring) once the lowering
+  // cares about such attributes. Perhaps the attributes representation
+  // can be shared with general function calls, though most functions
+  // will be opaque.
+  struct IntrinsicInfo {
+    IntrinsicID ID : 31;
+    bool HasSideEffects : 1;
+  };
+
+  // The complete set of information about an intrinsic.
+  struct FullIntrinsicInfo {
+    struct IntrinsicInfo Info; // Information that CodeGen would care about.
+
+    // Sanity check during parsing.
+    Type Signature[kMaxIntrinsicParameters];
+    uint8_t NumTypes;
+  };
+
+  // Find the information about a given intrinsic, based on function name.
+  // The function name is expected to have the common "llvm." prefix
+  // stripped. If found, returns a reference to a FullIntrinsicInfo entry
+  // (valid for the lifetime of the map). Otherwise returns null.
+  const FullIntrinsicInfo *find(const IceString &Name) const;
+
+private:
+  // TODO(jvoung): May want to switch to something like LLVM's StringMap.
+  typedef std::map<IceString, FullIntrinsicInfo> IntrinsicMap;
+  IntrinsicMap map;
+
+  Intrinsics(const Intrinsics &) LLVM_DELETED_FUNCTION;
+  Intrinsics &operator=(const Intrinsics &) LLVM_DELETED_FUNCTION;
+};
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICEINTRINSICS_H