tcg: Change translator-side labels to a pointer

This is improved type checking for the translators -- it's no longer
possible to accidentally swap arguments to the branch functions.

Note that the code generating backends still manipulate labels as int.

With notable exceptions, the scope of the change is just a few lines
for each target, so it's not worth building extra machinery to do this
change in per-target increments.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Cc: Anthony Green <green@moxielogic.com>
Cc: Jia Liu <proljc@gmail.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Blue Swirl <blauwirbel@gmail.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index 3841e9951c..751545e07e 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -246,7 +246,7 @@ static void tcg_out_label(TCGContext *s, int label_index, tcg_insn_unit *ptr)
     l->u.value_ptr = ptr;
 }
 
-int gen_new_label(void)
+TCGLabel *gen_new_label(void)
 {
     TCGContext *s = &tcg_ctx;
     int idx;
@@ -258,7 +258,8 @@ int gen_new_label(void)
     l = &s->labels[idx];
     l->has_value = 0;
     l->u.first_reloc = NULL;
-    return idx;
+
+    return l;
 }
 
 #include "tcg-target.c"