*/
#include <babeltrace/format.h>
+#include <babeltrace/align.h>
+#include <string.h>
+
+/* Preallocate this many fields for structures */
+#define DEFAULT_NR_STRUCT_FIELDS 8
+
+/*
+ * Always update stream_pos with move_pos and init_pos.
+ */
+struct stream_pos {
+ unsigned char *base; /* Base address */
+ size_t offset; /* Offset from base, in bits */
+ int dummy; /* Dummy position, for length calculation */
+};
+
+static inline
+void init_pos(struct stream_pos *pos, unsigned char *base)
+{
+ pos->base = base; /* initial base, page-aligned */
+ pos->offset = 0;
+ pos->dummy = false;
+}
+
+/*
+ * move_pos - move position of a relative bit offset
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void move_pos(struct stream_pos *pos, size_t offset)
+{
+ pos->offset = pos->offset + offset;
+}
+
+/*
+ * align_pos - align position on a bit offset (> 0)
+ *
+ * TODO: allow larger files by updating base too.
+ */
+static inline
+void align_pos(struct stream_pos *pos, size_t offset)
+{
+ pos->offset += offset_align(pos->offset, offset);
+}
+
+static inline
+void copy_pos(struct stream_pos *dest, struct stream_pos *src)
+{
+ memcpy(dest, src, sizeof(struct stream_pos));
+}
+
+static inline
+unsigned char *get_pos_addr(struct stream_pos *pos)
+{
+ /* Only makes sense to get the address after aligning on CHAR_BIT */
+ assert(!(pos->alignment % CHAR_BIT));
+ return pos->base + (pos->offset / CHAR_BIT);
+}
struct type_class {
GQuark name; /* type name */
* Type copy function. Knows how to find the child type_class from the
* parent type_class.
*/
- size_t (*copy)(unsigned char *dest, const struct format *fdest,
- const unsigned char *src, const struct format *fsrc,
+ size_t (*copy)(struct stream_pos *dest, const struct format *fdest,
+ struct stream_pos *src, const struct format *fsrc,
const struct type_class *type_class);
void (*free)(struct type_class *type_class);
};
+/*
+ * Because we address in bits, bitfields end up being exactly the same as
+ * integers, except that their read/write functions must be able to deal with
+ * read/write non aligned on CHAR_BIT.
+ */
struct type_class_integer {
struct type_class p;
size_t len; /* length, in bits. */
int signedness;
};
-struct type_class_bitfield {
- struct type_class_integer p;
- size_t start_offset; /* offset from base address, in bits */
-};
-
struct type_class_float {
struct type_class p;
- size_t mantissa_len;
- size_t exp_len;
+ struct int_class *sign;
+ struct int_class *mantissa;
+ struct int_class *exp;
int byte_order;
/* TODO: we might want to express more info about NaN, +inf and -inf */
};
};
struct type_class_enum {
- struct type_class_bitfield p; /* inherit from bitfield */
+ struct type_class_int p; /* inherit from integer */
struct enum_table table;
};
+struct type_class_string {
+ struct type_class p;
+};
+
+struct field {
+ GQuark name;
+ struct type_class *type_class;
+};
+
struct type_class_struct {
struct type_class p;
- /* TODO */
+ GHashTable *fields_by_name; /* Tuples (field name, field index) */
+ GArray *fields; /* Array of fields */
+};
+
+struct type_class_array {
+ struct type_class p;
+ size_t len;
+ struct type_class *elem;
+};
+
+struct type_class_sequence {
+ struct type_class p;
+ struct type_class_integer *len_class;
+ struct type_class *elem;
};
struct type_class *ctf_lookup_type(GQuark qname);
/* Nameless types can be created by passing a NULL name */
struct type_class_integer *integer_type_new(const char *name,
- size_t start_offset,
size_t len, int byte_order,
- int signedness);
+ int signedness,
+ size_t alignment);
void integer_type_free(struct type_class_integer *int_class);
-struct type_class_bitfield *bitfield_type_new(const char *name,
- size_t start_offset,
- size_t len, int byte_order,
- int signedness);
-void bitfield_type_free(struct type_class_bitfield *bitfield_class);
-
+/*
+ * mantissa_len is the length of the number of bytes represented by the mantissa
+ * (e.g. result of DBL_MANT_DIG). It includes the leading 1.
+ */
struct type_class_float *float_type_new(const char *name,
size_t mantissa_len,
size_t exp_len, int byte_order,
uint64_t v, GQuark q);
struct type_class_enum *enum_type_new(const char *name,
- size_t start_offset,
size_t len, int byte_order,
int signedness,
size_t alignment);
void enum_type_free(struct type_class_enum *enum_class);
+struct type_class_struct *struct_type_new(const char *name);
+void struct_type_free(struct type_class_struct *struct_class);
+void struct_type_add_field(struct type_class_struct *struct_class,
+ GQuark field_name,
+ struct type_class *type_class);
+/*
+ * Returns the index of a field within a structure.
+ */
+unsigned long
+struct_type_lookup_field_index(struct type_class_struct *struct_class,
+ GQuark field_name);
+/*
+ * field returned only valid as long as the field structure is not appended to.
+ */
+struct field *
+struct_type_get_field_from_index(struct type_class_struct *struct_class,
+ unsigned long index);
+
+/*
+ * elem_class passed as parameter now belongs to the array. No need to free it
+ * explicitely.
+ */
+struct type_class_array *array_type_new(const char *name,
+ size_t len,
+ struct type_class *elem_class);
+void array_type_free(struct type_class_array *array_class);
+
+/*
+ * int_class and elem_class passed as parameter now belongs to the sequence. No
+ * need to free them explicitely.
+ */
+struct type_class_sequence *sequence_type_new(const char *name,
+ struct type_class_integer *len_class,
+ struct type_class *elem_class);
+void sequence_type_free(struct type_class_sequence *sequence_class);
+
#endif /* _BABELTRACE_TYPES_H */
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