tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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PropertyKey.py (2172B)

      1 # This Source Code Form is subject to the terms of the Mozilla Public
      2 # License, v. 2.0. If a copy of the MPL was not distributed with this file,
      3 # You can obtain one at http://mozilla.org/MPL/2.0/.
      4 
      5 # Pretty-printers for JSID values.
      6 
      7 import mozilla.prettyprinters
      8 import mozilla.Root
      9 from mozilla.prettyprinters import pretty_printer
     10 
     11 # Forget any printers from previous loads of this module.
     12 mozilla.prettyprinters.clear_module_printers(__name__)
     13 
     14 
     15 @pretty_printer("JS::PropertyKey")
     16 class PropertyKey:
     17    # Since people don't always build with macro debugging info, I can't
     18    # think of any way to avoid copying these values here, short of using
     19    # inferior calls for every operation (which, I hear, is broken from
     20    # pretty-printers in some recent GDBs).
     21    StringTypeTag = 0x0
     22    IntTagBit = 0x1
     23    VoidTypeTag = 0x2
     24    SymbolTypeTag = 0x4
     25    TypeMask = 0x7
     26 
     27    def __init__(self, value, cache):
     28        self.value = value
     29        self.cache = cache
     30        self.concrete_type = self.value.type.strip_typedefs()
     31 
     32    def to_string(self):
     33        bits = self.value["asBits_"]
     34        tag = bits & PropertyKey.TypeMask
     35        if tag == PropertyKey.StringTypeTag:
     36            body = bits.cast(self.cache.JSString_ptr_t)
     37        elif tag & PropertyKey.IntTagBit:
     38            body = bits >> 1
     39        elif tag == PropertyKey.VoidTypeTag:
     40            return "JS::VoidPropertyKey"
     41        elif tag == PropertyKey.SymbolTypeTag:
     42            body = (bits & ~PropertyKey.TypeMask).cast(self.cache.JSSymbol_ptr_t)
     43        else:
     44            body = "<unrecognized>"
     45        return "$jsid(%s)" % (body,)
     46 
     47 
     48 @pretty_printer("JS::Rooted<long>")
     49 def RootedPropertyKey(value, cache):
     50    # Hard-code the referent type pretty-printer for PropertyKey roots and
     51    # handles. See the comment for mozilla.Root.Common.__init__.
     52    return mozilla.Root.Rooted(value, cache, PropertyKey)
     53 
     54 
     55 @pretty_printer("JS::Handle<long>")
     56 def HandlePropertyKey(value, cache):
     57    return mozilla.Root.Handle(value, cache, PropertyKey)
     58 
     59 
     60 @pretty_printer("JS::MutableHandle<long>")
     61 def MutableHandlePropertyKey(value, cache):
     62    return mozilla.Root.MutableHandle(value, cache, PropertyKey)