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authorRichard Henderson <rth@twiddle.net>2012-09-21 17:18:16 -0700
committerAurelien Jarno <aurelien@aurel32.net>2012-09-26 00:31:17 +0200
commit0a209d4bb119b92eb14b9afab55cef5bc0555554 (patch)
treecd74b583c63ddce227116639dc1176de2d69e358 /tcg/tcg-op.h
parent717e70368bdc339d241f84aba00ed72d051e0236 (diff)
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tcg: Sanity check goto_tb input
Checking that we don't try for idx != [01] is trivial. Checking that we don't issue more than one of any index requires a tad more data and some ifdefs protecting that new variable. Signed-off-by: Richard Henderson <rth@twiddle.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/tcg-op.h')
-rw-r--r--tcg/tcg-op.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index ecb1ac3..9bfed48 100644
--- a/tcg/tcg-op.h
+++ b/tcg/tcg-op.h
@@ -2275,8 +2275,15 @@ static inline void tcg_gen_exit_tb(tcg_target_long val)
tcg_gen_op1i(INDEX_op_exit_tb, val);
}
-static inline void tcg_gen_goto_tb(int idx)
-{
+static inline void tcg_gen_goto_tb(unsigned idx)
+{
+ /* We only support two chained exits. */
+ tcg_debug_assert(idx <= 1);
+#ifdef CONFIG_DEBUG_TCG
+ /* Verify that we havn't seen this numbered exit before. */
+ tcg_debug_assert((tcg_ctx.goto_tb_issue_mask & (1 << idx)) == 0);
+ tcg_ctx.goto_tb_issue_mask |= 1 << idx;
+#endif
tcg_gen_op1i(INDEX_op_goto_tb, idx);
}