| # Pretty-printer for SpiderMonkey symbols. |
| |
| import gdb |
| import mozilla.prettyprinters |
| from mozilla.prettyprinters import ptr_pretty_printer |
| |
| # Forget any printers from previous loads of this module. |
| mozilla.prettyprinters.clear_module_printers(__name__) |
| |
| # JS::SymbolCode enumerators |
| InSymbolRegistry = 0xfffffffe |
| UniqueSymbol = 0xffffffff |
| |
| @ptr_pretty_printer("JS::Symbol") |
| class JSSymbolPtr(mozilla.prettyprinters.Pointer): |
| def __init__(self, value, cache): |
| super(JSSymbolPtr, self).__init__(value, cache) |
| self.value = value |
| |
| def to_string(self): |
| code = int(self.value['code_']) & 0xffffffff |
| desc = str(self.value['description_']) |
| if code == InSymbolRegistry: |
| return "Symbol.for({})".format(desc) |
| elif code == UniqueSymbol: |
| return "Symbol({})".format(desc) |
| else: |
| # Well-known symbol. Strip off the quotes added by the JSString * |
| # pretty-printer. |
| assert desc[0] == '"' |
| assert desc[-1] == '"' |
| return desc[1:-1] |
| |
