tcg: Add tcg-be-null.h

This is a no-op backend data implementation, for those targets that
are not currently using the load/store optimization path.

This is prepatory to always requiring these functions in all backends.

Signed-off-by: Richard Henderson <rth@twiddle.net>

tcg/ia64/tcg-target.c

@@ -23,6 +23,8 @@
  * THE SOFTWARE.
  */
 
+#include "tcg-be-null.h"
+
 /*
  * Register definitions
  */

tcg/mips/tcg-target.c

@@ -24,6 +24,8 @@
  * THE SOFTWARE.
  */
 
+#include "tcg-be-null.h"
+
 #if defined(TCG_TARGET_WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)
 # define TCG_NEED_BSWAP 0
 #else

tcg/s390/tcg-target.c

@@ -24,6 +24,8 @@
  * THE SOFTWARE.
  */
 
+#include "tcg-be-null.h"
+
 /* We only support generating code for 64-bit mode.  */
 #if TCG_TARGET_REG_BITS != 64
 #error "unsupported code generation mode"

tcg/sparc/tcg-target.c

@@ -22,6 +22,8 @@
  * THE SOFTWARE.
  */
 
+#include "tcg-be-null.h"
+
 #ifndef NDEBUG
 static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
     "%g0",

tcg/tcg-be-null.h

@@ -0,0 +1,43 @@
+/*
+ * TCG Backend Data: No backend data
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+typedef struct TCGBackendData {
+    /* Empty */
+    char dummy;
+} TCGBackendData;
+
+
+/*
+ * Initialize TB backend data at the beginning of the TB.
+ */
+
+static inline void tcg_out_tb_init(TCGContext *s)
+{
+}
+
+/*
+ * Generate TB finalization at the end of block
+ */
+
+static inline void tcg_out_tb_finalize(TCGContext *s)
+{
+}

tcg/tci/tcg-target.c

@@ -22,6 +22,8 @@
  * THE SOFTWARE.
  */
 
+#include "tcg-be-null.h"
+
 /* TODO list:
  * - See TODO comments in code.
  */