tcg: Clean up direct block chaining data fields

Briefly describe in a comment how direct block chaining is done. It
should help in understanding of the following data fields.

Rename some fields in TranslationBlock and TCGContext structures to
better reflect their purpose (dropping excessive 'tb_' prefix in
TranslationBlock but keeping it in TCGContext):
   tb_next_offset  =>  jmp_reset_offset
   tb_jmp_offset   =>  jmp_insn_offset
   tb_next         =>  jmp_target_addr
   jmp_next        =>  jmp_list_next
   jmp_first       =>  jmp_list_first

Avoid using a magic constant as an invalid offset which is used to
indicate that there's no n-th jump generated.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/tcg/tci/tcg-target.inc.c b/tcg/tci/tcg-target.inc.c
index 85eeb5de24..fa74d5278e 100644
--- a/tcg/tci/tcg-target.inc.c
+++ b/tcg/tci/tcg-target.inc.c
@@ -553,19 +553,19 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
         tcg_out64(s, args[0]);
         break;
     case INDEX_op_goto_tb:
-        if (s->tb_jmp_offset) {
+        if (s->tb_jmp_insn_offset) {
             /* Direct jump method. */
-            tcg_debug_assert(args[0] < ARRAY_SIZE(s->tb_jmp_offset));
+            tcg_debug_assert(args[0] < ARRAY_SIZE(s->tb_jmp_insn_offset));
             /* Align for atomic patching and thread safety */
             s->code_ptr = QEMU_ALIGN_PTR_UP(s->code_ptr, 4);
-            s->tb_jmp_offset[args[0]] = tcg_current_code_size(s);
+            s->tb_jmp_insn_offset[args[0]] = tcg_current_code_size(s);
             tcg_out32(s, 0);
         } else {
             /* Indirect jump method. */
             TODO();
         }
-        tcg_debug_assert(args[0] < ARRAY_SIZE(s->tb_next_offset));
-        s->tb_next_offset[args[0]] = tcg_current_code_size(s);
+        tcg_debug_assert(args[0] < ARRAY_SIZE(s->tb_jmp_reset_offset));
+        s->tb_jmp_reset_offset[args[0]] = tcg_current_code_size(s);
         break;
     case INDEX_op_br:
         tci_out_label(s, arg_label(args[0]));