tcg: Introduce set_jmp_insn_offset

Similar to the existing set_jmp_reset_offset.  Move any assert for
TCG_TARGET_HAS_direct_jump into the new function (which now cannot
be build-time).  Will be unused if TCG_TARGET_HAS_direct_jump is
constant 0, but we can't test for constant in the preprocessor,
so just mark it G_GNUC_UNUSED.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index 2574793..4092dac 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -313,6 +313,16 @@ static void set_jmp_reset_offset(TCGContext *s, int which)
     s->tb_jmp_reset_offset[which] = tcg_current_code_size(s);
 }
 
+static void G_GNUC_UNUSED set_jmp_insn_offset(TCGContext *s, int which)
+{
+    /*
+     * We will check for overflow at the end of the opcode loop in
+     * tcg_gen_code, where we bound tcg_current_code_size to UINT16_MAX.
+     */
+    tcg_debug_assert(TCG_TARGET_HAS_direct_jump);
+    s->tb_jmp_insn_offset[which] = tcg_current_code_size(s);
+}
+
 /* Signal overflow, starting over with fewer guest insns. */
 static G_NORETURN
 void tcg_raise_tb_overflow(TCGContext *s)