[Qemu-devel] [PATCH 2/2] PPC: Fail on leaking temporaries

[Alexander Graf <agraf@suse.de>]

When QEMU gets compiled with --enable-debug-tcg we can check for temporary
leakage. Implement the necessary target code for this and fail emulation
when we hit a leakage.

This hopefully ensures that we don't get new leaks.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 target-ppc/translate.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 02cd18e..759133c 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -10412,6 +10412,7 @@ static inline void gen_intermediate_code_internal(PowerPCCPU *cpu,
         max_insns = CF_COUNT_MASK;
 
     gen_tb_start();
+    tcg_clear_temp_count();
     /* Set env in case of segfault during code fetch */
     while (ctx.exception == POWERPC_EXCP_NONE
             && tcg_ctx.gen_opc_ptr < gen_opc_end) {
@@ -10511,6 +10512,12 @@ static inline void gen_intermediate_code_internal(PowerPCCPU *cpu,
              */
             break;
         }
+        if (tcg_check_temp_count()) {
+            fprintf(stderr, "Opcode %02x %02x %02x (%08x) leaked temporaries\n",
+                    opc1(ctx.opcode), opc2(ctx.opcode), opc3(ctx.opcode),
+                    ctx.opcode);
+            exit(1);
+        }
     }
     if (tb->cflags & CF_LAST_IO)
         gen_io_end();
-- 
1.8.1.4