[Qemu-devel] [PATCH 5/13] Introduce next_cflags

[Jan Kiszka]

Introduce next_cflags as part of CPUState. It controls the compile flags
of the next newly generated TB. After use, it will automatically be reset
to zero. This allows the caller to simply set and then forget about it,
e.g. to ensure that the next, and only the next TB will contain just a
single instruction.

Signed-off-by: Jan Kiszka <address@hidden>
---
 cpu-defs.h |    4 ++++
 cpu-exec.c |    3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

Index: b/cpu-defs.h
===================================================================
--- a/cpu-defs.h
+++ b/cpu-defs.h
@@ -183,6 +183,10 @@ typedef struct CPUWatchpoint {
     } icount_decr;                                                      \
     uint32_t can_do_io; /* nonzero if memory mapped IO is safe.  */     \
                                                                         \
+    /* Compile flags for generating next regular TB.                    \
+       Will be automatically zeroed after use. */                       \
+    uint16_t next_cflags;                                               \
+                                                                        \
     /* from this point: preserved by CPU reset */                       \
     /* ice debug support */                                             \
     CPUBreakpoint *breakpoints;                                         \
Index: b/cpu-exec.c
===================================================================
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -150,7 +150,8 @@ static TranslationBlock *tb_find_slow(ta
     }
  not_found:
    /* if no translated code available, then translate it now */
-    tb = tb_gen_code(env, pc, cs_base, flags, 0);
+    tb = tb_gen_code(env, pc, cs_base, flags, env->next_cflags);
+    env->next_cflags = 0;
 
  found:
     /* we add the TB in the virtual pc hash table */