my_mozilla_printers.py

import gdb
import mozilla.prettyprinters as prettyprinters
from mozilla.prettyprinters import ptr_pretty_printer, pretty_printer

prettyprinters.clear_module_printers(__name__)

@pretty_printer('js::analyze::SSAValue')
class SSAValuePrinter(object):
    def __init__(self, value, cache):
        self.value = value
        self.cache = cache

        if not hasattr('cache', 'SSAValue_map'):
            cache.SSAValue_map = prettyprinters.AggregateMap(value.type)
            ev = prettyprinters.enum_value
            enum = gdb.lookup_type('js::analyze::SSAValue::Kind')
            cache.SSAValue_EMPTY  = ev(enum, 'js::analyze::SSAValue::EMPTY')
            cache.SSAValue_PUSHED = ev(enum, 'js::analyze::SSAValue::PUSHED')
            cache.SSAValue_VAR    = ev(enum, 'js::analyze::SSAValue::VAR')
            cache.SSAValue_PHI    = ev(enum, 'js::analyze::SSAValue::PHI')

        self.liveset = set()
        self.kind = self.value['u']['pushed']['kind']
        if self.kind == cache.SSAValue_PUSHED:
            cache.SSAValue_map.mark_live(self.liveset, ['u', 'pushed'])
        elif self.kind == cache.SSAValue_VAR:
            cache.SSAValue_map.mark_live(self.liveset, ['u', 'var'])
        elif self.kind == cache.SSAValue_PHI:
            cache.SSAValue_map.mark_live(self.liveset, ['u', 'phi'])

    def to_string(self):
        return None

    def children(self):
        if self.kind == self.cache.SSAValue_EMPTY:
            yield 'kind', 'EMPTY'
        else:
            for c in self.cache.SSAValue_map.children(self.value, self.liveset):
                yield c