forked from enlightenment/efl
105 lines
2.9 KiB
Python
105 lines
2.9 KiB
Python
import gdb
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"""
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All of this script relies heavily on Eo internals and will break if they
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change. Need to make sure this is always in sync.
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"""
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ptr_size = int(gdb.parse_and_eval('sizeof(void *)'))
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SHIFT_MID_TABLE_ID = 0x30
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MASK_MID_TABLE_ID = 0x7ff
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SHIFT_TABLE_ID = 0x25
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MASK_TABLE_ID = 0x7ff
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SHIFT_ENTRY_ID = 0x1a
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MASK_ENTRY_ID = 0x7ff
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MASK_GENERATIONS = 0x3ffffff
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MASK_OBJ_TAG = 0x4000000000000000
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if ptr_size == 4:
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# 32 bits
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BITS_MID_TABLE_ID = 5
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BITS_TABLE_ID = 5
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BITS_ENTRY_ID = 11
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BITS_GENERATION_COUNTER = 6
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BITS_DOMAIN = 2
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BITS_CLASS = 1
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REF_TAG_SHIFT = 30
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SUPER_TAG_SHIFT = 31
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DROPPED_TABLES = 0
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DROPPED_ENTRIES = 4
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else:
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# 64 bits
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BITS_MID_TABLE_ID = 11
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BITS_TABLE_ID = 11
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BITS_ENTRY_ID = 11
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BITS_GENERATION_COUNTER = 26
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BITS_DOMAIN = 2
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BITS_CLASS = 1
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REF_TAG_SHIFT = 62
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SUPER_TAG_SHIFT = 63
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DROPPED_TABLES = 2
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DROPPED_ENTRIES = 3
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# /* Shifts macros to manipulate the Eo id */
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SHIFT_DOMAIN = (BITS_MID_TABLE_ID + BITS_TABLE_ID +
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BITS_ENTRY_ID + BITS_GENERATION_COUNTER)
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SHIFT_MID_TABLE_ID = (BITS_TABLE_ID +
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BITS_ENTRY_ID + BITS_GENERATION_COUNTER)
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SHIFT_TABLE_ID = (BITS_ENTRY_ID + BITS_GENERATION_COUNTER)
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SHIFT_ENTRY_ID = (BITS_GENERATION_COUNTER)
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# /* Maximum ranges */
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MAX_DOMAIN = (1 << BITS_DOMAIN)
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MAX_MID_TABLE_ID = (1 << BITS_MID_TABLE_ID)
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MAX_TABLE_ID = ((1 << BITS_TABLE_ID) - DROPPED_TABLES)
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MAX_ENTRY_ID = ((1 << BITS_ENTRY_ID) - DROPPED_ENTRIES)
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MAX_GENERATIONS = (1 << BITS_GENERATION_COUNTER)
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# /* Masks */
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MASK_DOMAIN = (MAX_DOMAIN - 1)
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MASK_MID_TABLE_ID = (MAX_MID_TABLE_ID - 1)
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MASK_TABLE_ID = ((1 << BITS_TABLE_ID) - 1)
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MASK_ENTRY_ID = ((1 << BITS_ENTRY_ID) - 1)
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MASK_GENERATIONS = (MAX_GENERATIONS - 1)
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MASK_OBJ_TAG = (1 << (REF_TAG_SHIFT))
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null_ptr = gdb.parse_and_eval('(_Eo_Object *) 0')
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class Eo_resolve(gdb.Function):
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def __init__(self):
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gdb.Function.__init__(self, 'eo_resolve')
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def invoke(self, arg):
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obj_id = int(arg)
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mid_table_id = (obj_id >> SHIFT_MID_TABLE_ID) & MASK_MID_TABLE_ID
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table_id = (obj_id >> SHIFT_TABLE_ID) & MASK_TABLE_ID
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entry_id = (obj_id >> SHIFT_ENTRY_ID) & MASK_ENTRY_ID
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tag_bit = (obj_id) & MASK_OBJ_TAG
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generation = obj_id & MASK_GENERATIONS
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if (obj_id == 0) or (tag_bit == 0):
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gdb.write('Pointer is NULL or not a valid object.\n')
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return null_ptr
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entries = gdb.parse_and_eval('_eo_gdb_main_domain->tables[0]->' +
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'eo_ids_tables[{0}]'.format(mid_table_id))
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if int(entries) == 0:
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gdb.write('Pointer is not a valid object.\n')
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return null_ptr
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entry = entries[table_id]['entries'][entry_id]
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if (not entry['active']) or (int(entry['generation']) != generation):
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gdb.write('Pointer is no longer active.\n')
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return null_ptr
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return entry['ptr']
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Eo_resolve()
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