diff options
Diffstat (limited to 'js/src/gdb/mozilla/JSSymbol.py')
-rw-r--r-- | js/src/gdb/mozilla/JSSymbol.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/gdb/mozilla/JSSymbol.py b/js/src/gdb/mozilla/JSSymbol.py new file mode 100644 index 0000000000..db96898c91 --- /dev/null +++ b/js/src/gdb/mozilla/JSSymbol.py @@ -0,0 +1,40 @@ +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this file, +# You can obtain one at http://mozilla.org/MPL/2.0/. + +# Pretty-printer for SpiderMonkey symbols. + +import mozilla.prettyprinters +from mozilla.CellHeader import get_header_ptr +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 +PrivateNameSymbol = 0xFFFFFFFD +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(get_header_ptr(self.value, self.cache.JSString_ptr_t)) + if code == InSymbolRegistry: + return "Symbol.for({})".format(desc) + elif code == UniqueSymbol: + return "Symbol({})".format(desc) + elif code == PrivateNameSymbol: + return "#{}".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] |