1# pretty printing for stage1.
 2# put "source /path/to/stage1_gdb_pretty_printers.py" in ~/.gdbinit to load it automatically.
 3import gdb.printing
 4
 5class ZigListPrinter:
 6    def __init__(self, val):
 7        self.val = val
 8
 9    def to_string(self):
10        return '%s of length %d, capacity %d' % (self.val.type.name, int(self.val['length']), int(self.val['capacity']))
11
12    def children(self):
13        def it(ziglist):
14            for i in range(int(ziglist.val['length'])):
15                item = ziglist.val['items'] + i
16                yield ('[%d]' % i, item.dereference())
17        return it(self)
18
19    def display_hint(self):
20        return 'array'
21
22# handle both Buf and ZigList<char> because Buf* doesn't work otherwise (gdb bug?)
23class BufPrinter:
24    def __init__(self, val):
25        self.val = val['list'] if val.type.name == 'Buf' else val
26
27    def to_string(self):
28        return self.val['items'].string(length=int(self.val['length']))
29
30    def display_hint(self):
31        return 'string'
32
33pp = gdb.printing.RegexpCollectionPrettyPrinter('Zig stage1 compiler')
34pp.add_printer('Buf', '^Buf$', BufPrinter)
35pp.add_printer('ZigList<char>', '^ZigList<char>$', BufPrinter)
36pp.add_printer('ZigList', '^ZigList<.*>$', ZigListPrinter)
37gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)