-/* src/native/llni.h - low level native interfarce (LLNI) macros
+/* src/native/llni.h - low level native interfarce (LLNI)
Copyright (C) 2007 R. Grafl, A. Krall, C. Kruegel,
C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: llni.h 8343 2007-08-17 21:39:32Z michi $
-
*/
#include "config.h"
+#include "native/localref.h"
+
/* LLNI macros *****************************************************************
LLNI_field_direct(obj, field) = (value)
#define LLNI_field_set_ref(obj, field, reference) \
- LLNI_field_set_val(obj, field, reference)
+ LLNI_field_direct(obj, field) = LLNI_DIRECT(reference)
#define LLNI_field_set_cls(obj, field, value) \
LLNI_field_direct(obj, field) = (java_lang_Class *) (value)
(variable) = LLNI_field_direct(obj, field)
#define LLNI_field_get_ref(obj, field, variable) \
- LLNI_field_get_val(obj, field, variable)
+ (variable) = LLNI_WRAP(LLNI_field_direct(obj, field))
#define LLNI_field_get_cls(obj, field, variable) \
(variable) = (classinfo *) LLNI_field_direct(obj, field)
#define LLNI_class_get(obj, variable) \
- (variable) = LLNI_field_direct(obj, header.vftbl->class)
+ (variable) = LLNI_field_direct((java_handle_t *) obj, vftbl->class)
+
+
+/* LLNI_equals ****************************************************************
+
+ Test if two java_handle_t* point to the same java_object_t*.
+
+******************************************************************************/
+
+#define LLNI_equals(obj1, obj2, result) \
+ LLNI_CRITICAL_START; \
+ (result) = LLNI_UNWRAP(obj1) == LLNI_UNWRAP(obj2); \
+ LLNI_CRITICAL_END
+
+
+/* LLNI_classinfo_field_get ***************************************************
+
+ Get a field from classinfo that is a java object.
+
+******************************************************************************/
+
+#define LLNI_classinfo_field_get(cls, field, variable) \
+ LLNI_CRITICAL_START; \
+ (variable) = LLNI_WRAP((cls)->field); \
+ LLNI_CRITICAL_END
+
+
+/* LLNI_classinfo_field_set ***************************************************
+
+ Set a field from classinfo that is a java object.
+
+******************************************************************************/
+
+#define LLNI_classinfo_field_set(cls, field, variable) \
+ LLNI_CRITICAL_START; \
+ (cls)->field = LLNI_UNWRAP(variable); \
+ LLNI_CRITICAL_END
/* LLNI classinfo wrapping / unwrapping macros *********************************
The following macros are used to wrap or unwrap a classinfo from
- or into a handle (typically java_lang_Class).
+ or into a handle (typically java_lang_Class). No critical sections
+ are needed here, because classinfos are not placed on the GC heap.
+
+ XXX This might change once we implement Class Unloading!
*******************************************************************************/
#define LLNI_classinfo_wrap(classinfo) \
- ((java_lang_Class *) (classinfo))
+ ((java_lang_Class *) LLNI_WRAP(classinfo))
#define LLNI_classinfo_unwrap(clazz) \
- ((classinfo *) (clazz))
+ ((classinfo *) LLNI_UNWRAP((java_handle_t *) (clazz)))
/* XXX the direct macros have to be used inside a critical section!!! */
-#define LLNI_field_direct(obj, field) ((obj)->field)
-
-#define LLNI_vftbl_direct(obj) (((java_handle_t *) (obj))->vftbl)
+#define LLNI_field_direct(obj, field) (LLNI_DIRECT(obj)->field)
+#define LLNI_vftbl_direct(obj) (LLNI_DIRECT((java_handle_t *) (obj))->vftbl)
+#define LLNI_array_direct(arr, index) (LLNI_DIRECT(arr)->data[(index)])
+#define LLNI_array_data(arr) (LLNI_DIRECT(arr)->data)
+#define LLNI_array_size(arr) (LLNI_DIRECT((java_handle_objectarray_t *) (arr))->header.size)
-#define LLNI_array_direct(arr, index) ((arr)->data[(index)])
-
-#define LLNI_array_data(arr) ((arr)->data)
-
-#define LLNI_array_size(arr) ((java_array_t *) (arr))->size
/* XXX document me */
#define LLNI_objectarray_element_set(arr, index, reference) \
- LLNI_array_direct(arr, index) = reference
+ LLNI_array_direct(arr, index) = (java_object_t *) LLNI_DIRECT(reference)
#define LLNI_objectarray_element_get(arr, index, variable) \
- (variable) = (java_handle_t *) LLNI_array_direct(arr, index)
+ (variable) = LLNI_WRAP(LLNI_array_direct(arr, index))
+
+
+/* LLNI wrapping / unwrapping macros *******************************************
+
+ ATTENTION: Only use these macros inside a LLNI critical section!
+ Once the ciritical section ends, all pointers onto the GC heap
+ retrieved through these macros are void!
+
+*******************************************************************************/
+
+#if defined(ENABLE_HANDLES)
+# define LLNI_WRAP(obj) ((obj) == NULL ? NULL : localref_add(obj))
+# define LLNI_UNWRAP(hdl) ((hdl) == NULL ? NULL : (hdl)->heap_object)
+# define LLNI_DIRECT(obj) ((obj)->heap_object)
+#else
+# define LLNI_WRAP(obj) (obj)
+# define LLNI_UNWRAP(hdl) (hdl)
+# define LLNI_DIRECT(obj) (obj)
+#endif
+
+
+/* LLNI critical sections ******************************************************
+
+ These macros handle the LLNI critical sections. While a critical
+ section is active, the absolute position of objects on the GC heap
+ is not allowed to change (no moving Garbage Collection).
+
+ ATTENTION: Use a critical section whenever you have a direct
+ pointer onto the GC heap!
+
+*******************************************************************************/
+#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
+void llni_critical_start(void);
+void llni_critical_end(void);
+# define LLNI_CRITICAL_START llni_critical_start()
+# define LLNI_CRITICAL_END llni_critical_end()
+#else
+# define LLNI_CRITICAL_START
+# define LLNI_CRITICAL_END
+#endif
#endif /* _LLNI_H */
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