[v13,05/10] debug: add -d tb_stats to control TBStatistics collection:

diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index 78a3104c7f..68ac7d3f73 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -208,3 +208,8 @@  uint32_t get_default_tbstats_flag(void)
 {
     return default_tbstats_flag;
 }
+
+void set_default_tbstats_flag(uint32_t flags)
+{
+    default_tbstats_flag = flags;
+}
diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h
index 20e7835ff0..4372817951 100644
--- a/include/exec/gen-icount.h
+++ b/include/exec/gen-icount.h
@@ -3,6 +3,7 @@ 
 
 #include "exec/exec-all.h"
 #include "exec/tb-stats.h"
+#include "tb-stats-flags.h"
 
 /* Helpers for instruction counting code generation.  */
 
diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h
index f29eff7576..04adaee8d9 100644
--- a/include/exec/tb-stats-flags.h
+++ b/include/exec/tb-stats-flags.h
@@ -15,6 +15,7 @@ 
 #define TB_EXEC_STATS (1 << 1)
 #define TB_JIT_STATS  (1 << 2)
 #define TB_JIT_TIME   (1 << 3)
+#define TB_ALL_STATS  (TB_EXEC_STATS | TB_JIT_STATS | TB_JIT_TIME)
 
 /* TBStatistic collection controls */
 void enable_collect_tb_stats(void);
@@ -24,5 +25,7 @@  bool tb_stats_collection_enabled(void);
 bool tb_stats_collection_paused(void);
 
 uint32_t get_default_tbstats_flag(void);
+void set_default_tbstats_flag(uint32_t);
+void set_tbstats_flags(uint32_t flags);
 
 #endif
diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h
index d93d42e085..72585c448a 100644
--- a/include/exec/tb-stats.h
+++ b/include/exec/tb-stats.h
@@ -31,6 +31,8 @@ 
 #include "exec/tb-stats-flags.h"
 #include "tcg/tcg.h"
 
+#include "exec/tb-stats-flags.h"
+
 #define tb_stats_enabled(tb, JIT_STATS) \
     (tb && tb->tb_stats && (tb->tb_stats->stats_enabled & JIT_STATS))
 
diff --git a/include/qemu/log.h b/include/qemu/log.h
index c5643d8dd5..6f3b8091cd 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -35,6 +35,7 @@  bool qemu_log_separate(void);
 /* LOG_STRACE is used for user-mode strace logging. */
 #define LOG_STRACE         (1 << 19)
 #define LOG_PER_THREAD     (1 << 20)
+#define CPU_LOG_TB_STATS   (1 << 21)
 
 /* Lock/unlock output. */
 
diff --git a/stubs/meson.build b/stubs/meson.build
index a56645e2f7..e926649d40 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -65,3 +65,4 @@  else
 endif
 stub_ss.add(files('semihost-all.c'))
 stub_ss.add(when: 'CONFIG_VFIO_USER_SERVER', if_false: files('vfio-user-obj.c'))
+stub_ss.add(files('tb-stats.c'))
diff --git a/stubs/tb-stats.c b/stubs/tb-stats.c
new file mode 100644
index 0000000000..d212c2a1fa
--- /dev/null
+++ b/stubs/tb-stats.c
@@ -0,0 +1,27 @@ 
+/*
+ * TB Stats Stubs
+ *
+ * Copyright (c) 2019
+ * Written by Alex Bennée <alex.bennee@linaro.org>
+ *
+ * This code is licensed under the GNU GPL v2, or later.
+ */
+
+
+#include "qemu/osdep.h"
+#include "exec/tb-stats-flags.h"
+
+void enable_collect_tb_stats(void)
+{
+    return;
+}
+
+bool tb_stats_collection_enabled(void)
+{
+    return false;
+}
+
+void set_default_tbstats_flag(uint32_t flags)
+{
+    return;
+}
diff --git a/util/log.c b/util/log.c
index 53b4f6c58e..7ae471d97c 100644
--- a/util/log.c
+++ b/util/log.c
@@ -19,6 +19,7 @@ 
 
 #include "qemu/osdep.h"
 #include "qemu/log.h"
+#include "qemu/qemu-print.h"
 #include "qemu/range.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
@@ -27,6 +28,7 @@ 
 #include "qemu/thread.h"
 #include "qemu/lockable.h"
 #include "qemu/rcu.h"
+#include "exec/tb-stats-flags.h"
 #ifdef CONFIG_LINUX
 #include <sys/syscall.h>
 #endif
@@ -47,6 +49,7 @@  static __thread Notifier qemu_log_thread_cleanup_notifier;
 int qemu_loglevel;
 static bool log_per_thread;
 static GArray *debug_regions;
+int32_t max_num_hot_tbs_to_dump;
 
 /* Returns true if qemu_log() will really write somewhere. */
 bool qemu_log_enabled(void)
@@ -495,6 +498,10 @@  const QEMULogItem qemu_log_items[] = {
       "log every user-mode syscall, its input, and its result" },
     { LOG_PER_THREAD, "tid",
       "open a separate log file per thread; filename must contain '%d'" },
+    { CPU_LOG_TB_STATS,
+      "tb_stats[[,level=(+all+jit+exec+time)][,dump_limit=<number>]]",
+      "enable collection of TBs statistics"
+      "(and dump until given a limit if in user mode).\n" },
     { 0, NULL, NULL },
 };
 
@@ -516,6 +523,36 @@  int qemu_str_to_log_mask(const char *str)
             trace_enable_events((*tmp) + 6);
             mask |= LOG_TRACE;
 #endif
+        } else if (g_str_has_prefix(*tmp, "tb_stats")) {
+            mask |= CPU_LOG_TB_STATS;
+            set_default_tbstats_flag(TB_ALL_STATS);
+            enable_collect_tb_stats();
+        } else if (tb_stats_collection_enabled() &&
+                   g_str_has_prefix(*tmp, "dump_limit=")) {
+            max_num_hot_tbs_to_dump = atoi((*tmp) + 11);
+        } else if (tb_stats_collection_enabled() &&
+                   g_str_has_prefix(*tmp, "level=")) {
+            uint32_t flags = 0;
+            char **level_parts = g_strsplit(*tmp + 6, "+", 0);
+            char **level_tmp;
+            for (level_tmp = level_parts; level_tmp && *level_tmp;
+                    level_tmp++) {
+                if (g_str_equal(*level_tmp, "jit")) {
+                    flags |= TB_JIT_STATS;
+                } else if (g_str_equal(*level_tmp, "exec")) {
+                    flags |= TB_EXEC_STATS;
+                } else if (g_str_equal(*level_tmp, "time")) {
+                    flags |= TB_JIT_TIME;
+                } else if (g_str_equal(*level_tmp, "all")) {
+                    flags |= TB_ALL_STATS;
+                } else {
+                    /* FIXME: set errp */
+                    fprintf(stderr, "no option level=%s, valid options are:"
+                            "all, jit, exec or/and time\n", *level_tmp);
+                    exit(1);
+                }
+                set_default_tbstats_flag(flags);
+            }
         } else {
             for (item = qemu_log_items; item->mask != 0; item++) {
                 if (g_str_equal(*tmp, item->name)) {