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-rw-r--r--libguile/frames.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/libguile/frames.c b/libguile/frames.c
index c7505b262..45f1c8d92 100644
--- a/libguile/frames.c
+++ b/libguile/frames.c
@@ -237,11 +237,16 @@ SCM_DEFINE (scm_frame_instruction_pointer, "frame-instruction-pointer", 1, 0, 0,
"")
#define FUNC_NAME s_scm_frame_instruction_pointer
{
+ SCM program;
const struct scm_objcode *c_objcode;
SCM_VALIDATE_VM_FRAME (1, frame);
+ program = scm_frame_procedure (frame);
- c_objcode = SCM_PROGRAM_DATA (scm_frame_procedure (frame));
+ if (!SCM_PROGRAM_P (program))
+ return SCM_INUM0;
+
+ c_objcode = SCM_PROGRAM_DATA (program);
return scm_from_unsigned_integer ((SCM_VM_FRAME_IP (frame)
- SCM_C_OBJCODE_BASE (c_objcode)));
}