From 90bb4246c34580eb6c8a5a41a4e19fcd5f334f09 Mon Sep 17 00:00:00 2001
From: Josh Haberman <haberman@google.com>
Date: Sat, 25 May 2013 10:26:59 -0700
Subject: Synced with Google-internal development.

C++ handlers are now type-safe; SinkFrame is gone.
Various other changes.
---
 upb/shim/shim.h | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 upb/shim/shim.h

(limited to 'upb/shim/shim.h')

diff --git a/upb/shim/shim.h b/upb/shim/shim.h
new file mode 100644
index 0000000..98310d7
--- /dev/null
+++ b/upb/shim/shim.h
@@ -0,0 +1,74 @@
+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2013 Google Inc.  See LICENSE for details.
+ * Author: Josh Haberman <jhaberman@gmail.com>
+ *
+ * For handlers that do very tiny, very simple operations, the function call
+ * overhead of calling a handler can be significant.  This file allows the
+ * user to define handlers that do something very simple like store the value
+ * to memory and/or set a hasbit.  JIT compilers can then special-case these
+ * handlers and emit specialized code for them instead of actually calling the
+ * handler.
+ *
+ * The functionality is very simple/limited right now but may expand to be able
+ * to call another function.
+ */
+
+#ifndef UPB_SHIM_H
+#define UPB_SHIM_H
+
+#include "upb/handlers.h"
+
+typedef struct {
+  size_t offset;
+  int32_t hasbit;
+} upb_shim_data;
+
+#ifdef __cplusplus
+
+namespace upb {
+
+struct Shim {
+  typedef upb_shim_data Data;
+
+  // Sets a handler for the given field that writes the value to the given
+  // offset and, if hasbit >= 0, sets a bit at the given bit offset.  Returns
+  // true if the handler was set successfully.
+  static bool Set(Handlers *h, const FieldDef *f, size_t ofs, int32_t hasbit);
+
+  // If this handler is a shim, returns the corresponding upb::Shim::Data.
+  // Otherwise returns NULL.
+  static const Data* GetData(const Handlers* h, Handlers::Selector s);
+};
+
+}  // namespace upb
+
+extern "C" {
+#endif
+
+// C API.
+bool upb_shim_set(upb_handlers *h, const upb_fielddef *f, size_t offset,
+                  int32_t hasbit);
+const upb_shim_data *upb_shim_getdata(const upb_handlers *h, upb_selector_t s);
+
+#ifdef __cplusplus
+}  // extern "C"
+
+namespace upb {
+
+// C++ Wrappers.
+inline bool Shim::Set(Handlers* h, const FieldDef* f, size_t ofs,
+                      int32_t hasbit) {
+  return upb_shim_set(h, f, ofs, hasbit);
+}
+inline const Shim::Data* Shim::GetData(const Handlers* h,
+                                       Handlers::Selector s) {
+  return upb_shim_getdata(h, s);
+}
+
+}  // namespace
+
+#endif
+
+#endif  // UPB_SHIM_H
-- 
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