tcg: Use uintptr_t type for jmp_list_{next|first} fields of TB

These fields do not contain pure pointers to a TranslationBlock
structure. So uintptr_t is the most appropriate type for them.
Also put some asserts to assure that the two least significant bits of
the pointer are always zero before assigning it to jmp_list_first.

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, 20 insertions, 18 deletions

diff --git a/translate-all.c b/translate-all.c
index c6613d13c9..2fb16466c1 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -928,17 +928,17 @@ static inline void tb_page_remove(TranslationBlock **ptb, TranslationBlock *tb)
 
 static inline void tb_jmp_remove(TranslationBlock *tb, int n)
 {
-    TranslationBlock *tb1, **ptb;
+    TranslationBlock *tb1;
+    uintptr_t *ptb, ntb;
     unsigned int n1;
 
     ptb = &tb->jmp_list_next[n];
-    tb1 = *ptb;
-    if (tb1) {
+    if (*ptb) {
         /* find tb(n) in circular list */
         for (;;) {
-            tb1 = *ptb;
-            n1 = (uintptr_t)tb1 & 3;
-            tb1 = (TranslationBlock *)((uintptr_t)tb1 & ~3);
+            ntb = *ptb;
+            n1 = ntb & 3;
+            tb1 = (TranslationBlock *)(ntb & ~3);
             if (n1 == n && tb1 == tb) {
                 break;
             }
@@ -951,7 +951,7 @@ static inline void tb_jmp_remove(TranslationBlock *tb, int n)
         /* now we can suppress tb(n) from the list */
         *ptb = tb->jmp_list_next[n];
 
-        tb->jmp_list_next[n] = NULL;
+        tb->jmp_list_next[n] = (uintptr_t)NULL;
     }
 }
 
@@ -970,7 +970,7 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
     PageDesc *p;
     unsigned int h, n1;
     tb_page_addr_t phys_pc;
-    TranslationBlock *tb1, *tb2;
+    uintptr_t tb1, tb2;
 
     /* remove the TB from the hash list */
     phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
@@ -1006,19 +1006,20 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
     /* suppress any remaining jumps to this TB */
     tb1 = tb->jmp_list_first;
     for (;;) {
-        n1 = (uintptr_t)tb1 & 3;
+        TranslationBlock *tmp_tb;
+        n1 = tb1 & 3;
         if (n1 == 2) {
             break;
         }
-        tb1 = (TranslationBlock *)((uintptr_t)tb1 & ~3);
-        tb2 = tb1->jmp_list_next[n1];
-        tb_reset_jump(tb1, n1);
-        tb1->jmp_list_next[n1] = NULL;
+        tmp_tb = (TranslationBlock *)(tb1 & ~3);
+        tb2 = tmp_tb->jmp_list_next[n1];
+        tb_reset_jump(tmp_tb, n1);
+        tmp_tb->jmp_list_next[n1] = (uintptr_t)NULL;
         tb1 = tb2;
     }
 
-    /* fail safe */
-    tb->jmp_list_first = (TranslationBlock *)((uintptr_t)tb | 2);
+    assert(((uintptr_t)tb & 3) == 0);
+    tb->jmp_list_first = (uintptr_t)tb | 2; /* fail safe */
 
     tcg_ctx.tb_ctx.tb_phys_invalidate_count++;
 }
@@ -1492,9 +1493,10 @@ static void tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
         tb->page_addr[1] = -1;
     }
 
-    tb->jmp_list_first = (TranslationBlock *)((uintptr_t)tb | 2);
-    tb->jmp_list_next[0] = NULL;
-    tb->jmp_list_next[1] = NULL;
+    assert(((uintptr_t)tb & 3) == 0);
+    tb->jmp_list_first = (uintptr_t)tb | 2;
+    tb->jmp_list_next[0] = (uintptr_t)NULL;
+    tb->jmp_list_next[1] = (uintptr_t)NULL;
 
     /* init original jump addresses */
     if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {