cpu-exec: Allow "-d exec" in non-debug builds (drop CONFIG_DEBUG_EXEC)

The CONFIG_DEBUG_EXEC define compiles out a single qemu_log_mask()
call, which is a pretty trivial cost even for something in the main
cpu_exec() loop.  Having this be conditionally defined means that
'-d exec' on a non-debug build will silently do nothing.  Drop the
define and the configure machinery that sets it, in favour of just
always allowing this log option to be enabled at runtime.  As a
concession to the mainloopiness, we use qemu_loglevel_mask()+qemu_log()
rather than qemu_log_mask() to avoid the function call overhead.

Note that DEBUG_DISAS is always defined, so removing the
'|| defined(CONFIG_DEBUG_EXEC)' from those conditionals makes
no behavioural change for that logging.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/configure b/configure
index 1ed939a3ac9f9344795ba884827694b75af61b4a..73df1814063eb566a6703df8d8e6d293a8a39d81 100755 (executable)
--- a/configure
+++ b/configure
@@ -3471,9 +3471,6 @@ echo "ARCH=$ARCH" >> $config_host_mak
 if test "$debug_tcg" = "yes" ; then
   echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
 fi
-if test "$debug" = "yes" ; then
-  echo "CONFIG_DEBUG_EXEC=y" >> $config_host_mak
-fi
 if test "$strip_opt" = "yes" ; then
   echo "STRIP=${strip}" >> $config_host_mak
 fi

diff --git a/cpu-exec.c b/cpu-exec.c
index e74e55656a4028579562615b010472d999d3176a..235ddeed78f7e23f533967d99cd546c722bff26d 100644 (file)
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -23,8 +23,6 @@
 #include "qemu/atomic.h"
 #include "sysemu/qtest.h"
 
-//#define CONFIG_DEBUG_EXEC
-
 bool qemu_cpu_has_work(CPUState *cpu)
 {
     return cpu_has_work(cpu);
@@ -567,7 +565,7 @@ int cpu_exec(CPUArchState *env)
                     env->exception_index = EXCP_INTERRUPT;
                     cpu_loop_exit(env);
                 }
-#if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
+#if defined(DEBUG_DISAS)
                 if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
                     /* restore flags in standard format */
 #if defined(TARGET_I386)
@@ -582,7 +580,7 @@ int cpu_exec(CPUArchState *env)
                     log_cpu_state(env, 0);
 #endif
                 }
-#endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
+#endif /* DEBUG_DISAS */
                 spin_lock(&tcg_ctx.tb_ctx.tb_lock);
                 tb = tb_find_fast(env);
                 /* Note: we do it here to avoid a gcc bug on Mac OS X when
@@ -594,11 +592,10 @@ int cpu_exec(CPUArchState *env)
                     next_tb = 0;
                     tcg_ctx.tb_ctx.tb_invalidated_flag = 0;
                 }
-#ifdef CONFIG_DEBUG_EXEC
-                qemu_log_mask(CPU_LOG_EXEC, "Trace %p [" TARGET_FMT_lx "] %s\n",
-                             tb->tc_ptr, tb->pc,
-                             lookup_symbol(tb->pc));
-#endif
+                if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
+                    qemu_log("Trace %p [" TARGET_FMT_lx "] %s\n",
+                             tb->tc_ptr, tb->pc, lookup_symbol(tb->pc));
+                }
                 /* see if we can patch the calling TB. When the TB
                    spans two pages, we cannot safely do a direct
                    jump. */