[Qemu-devel] [PATCH 3/5] tcg: add tcg_enabled() and stop compiling translate.o when TCG is disabled

[Anthony Liguori <aliguori@us.ibm.com>]

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 Makefile.target |    3 ++-
 cpu-all.h       |    6 ++++++
 exec.c          |    2 +-
 qemu-common.h   |    2 +-
 translate-all.c |   12 +++++++++---
 5 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/Makefile.target b/Makefile.target
index 0787758..70f52cc 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -67,10 +67,11 @@ all: $(PROGS) stap
 
 #########################################################
 # cpu emulator library
-libobj-y = exec.o translate-all.o cpu-exec.o translate.o
+libobj-y = exec.o translate-all.o cpu-exec.o
 libobj-y += tcg/tcg.o tcg/optimize.o
 libobj-y += fpu/softfloat.o
 libobj-y += op_helper.o helper.o
+libobj-$(CONFIG_TCG) += translate.o
 ifeq ($(TARGET_BASE_ARCH), i386)
 libobj-y += cpuid.o
 endif
diff --git a/cpu-all.h b/cpu-all.h
index f5c82cd..84a852c 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -22,6 +22,12 @@
 #include "qemu-common.h"
 #include "cpu-common.h"
 
+#if defined(CONFIG_TCG)
+#define tcg_enabled() (tcg_in_use())
+#else
+#define tcg_enabled() (0)
+#endif
+
 /* some important defines:
  *
  * WORDS_ALIGNED : if defined, the host cpu can only make word aligned
diff --git a/exec.c b/exec.c
index c1e045d..578da0e 100644
--- a/exec.c
+++ b/exec.c
@@ -585,7 +585,7 @@ void tcg_exec_init(unsigned long tb_size)
 #endif
 }
 
-bool tcg_enabled(void)
+bool tcg_in_use(void)
 {
     return code_gen_buffer != NULL;
 }
diff --git a/qemu-common.h b/qemu-common.h
index 404c421..02a3071 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -268,7 +268,7 @@ typedef struct QEMUSGList QEMUSGList;
 typedef uint64_t pcibus_t;
 
 void tcg_exec_init(unsigned long tb_size);
-bool tcg_enabled(void);
+bool tcg_in_use(void);
 
 void cpu_exec_init_all(void);
 
diff --git a/translate-all.c b/translate-all.c
index 041c108..ecb035a 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -67,7 +67,9 @@ int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
 #endif
     tcg_func_start(s);
 
-    gen_intermediate_code(env, tb);
+    if (tcg_enabled()) {
+        gen_intermediate_code(env, tb);
+    }
 
     /* generate machine code */
     gen_code_buf = tb->tc_ptr;
@@ -123,7 +125,9 @@ int cpu_restore_state(TranslationBlock *tb,
 #endif
     tcg_func_start(s);
 
-    gen_intermediate_code_pc(env, tb);
+    if (tcg_enabled()) {
+        gen_intermediate_code_pc(env, tb);
+    }
 
     if (use_icount) {
         /* Reset the cycle counter to the start of the block.  */
@@ -153,7 +157,9 @@ int cpu_restore_state(TranslationBlock *tb,
         j--;
     env->icount_decr.u16.low -= gen_opc_icount[j];
 
-    restore_state_to_opc(env, tb, j);
+    if (tcg_enabled()) {
+        restore_state_to_opc(env, tb, j);
+    }
 
 #ifdef CONFIG_PROFILER
     s->restore_time += profile_getclock() - ti;
-- 
1.7.4.1