The Tor Browser / file comparison
comparison: js/src/gdb/mozilla/jsid.py
js/src/gdb/mozilla/jsid.py
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:52688ff4fc7e |
|---|---|
| 1 # Pretty-printers for JSID values. | |
| 2 | |
| 3 import gdb | |
| 4 import mozilla.prettyprinters | |
| 5 import mozilla.Root | |
| 6 | |
| 7 from mozilla.prettyprinters import pretty_printer | |
| 8 | |
| 9 # Forget any printers from previous loads of this module. | |
| 10 mozilla.prettyprinters.clear_module_printers(__name__) | |
| 11 | |
| 12 @pretty_printer('jsid') | |
| 13 class jsid(object): | |
| 14 # Since people don't always build with macro debugging info, I can't | |
| 15 # think of any way to avoid copying these values here, short of using | |
| 16 # inferior calls for every operation (which, I hear, is broken from | |
| 17 # pretty-printers in some recent GDBs). | |
| 18 TYPE_STRING = 0x0 | |
| 19 TYPE_INT = 0x1 | |
| 20 TYPE_VOID = 0x2 | |
| 21 TYPE_OBJECT = 0x4 | |
| 22 TYPE_MASK = 0x7 | |
| 23 | |
| 24 def __init__(self, value, cache): | |
| 25 self.value = value | |
| 26 self.cache = cache | |
| 27 self.concrete_type = self.value.type.strip_typedefs() | |
| 28 | |
| 29 # SpiderMonkey has two alternative definitions of jsid: a typedef for | |
| 30 # ptrdiff_t, and a struct with == and != operators defined on it. | |
| 31 # Extract the bits from either one. | |
| 32 def as_bits(self): | |
| 33 if self.concrete_type.code == gdb.TYPE_CODE_STRUCT: | |
| 34 return self.value['asBits'] | |
| 35 elif self.concrete_type.code == gdb.TYPE_CODE_INT: | |
| 36 return self.value | |
| 37 else: | |
| 38 raise RuntimeError, ("definition of SpiderMonkey 'jsid' type" | |
| 39 "neither struct nor integral type") | |
| 40 | |
| 41 def to_string(self): | |
| 42 bits = self.as_bits() | |
| 43 tag = bits & jsid.TYPE_MASK | |
| 44 if tag == jsid.TYPE_STRING: | |
| 45 body = bits.cast(self.cache.JSString_ptr_t) | |
| 46 elif tag & jsid.TYPE_INT: | |
| 47 body = bits >> 1 | |
| 48 elif tag == jsid.TYPE_VOID: | |
| 49 return "JSID_VOID" | |
| 50 elif tag == jsid.TYPE_OBJECT: | |
| 51 body = ((bits & ~jsid.TYPE_MASK) | |
| 52 .cast(self.cache.JSObject_ptr_t)) | |
| 53 else: | |
| 54 body = "<unrecognized>" | |
| 55 return '$jsid(%s)' % (body,) | |
| 56 | |
| 57 # Hard-code the referent type pretty-printer for jsid roots and handles. | |
| 58 # See the comment for mozilla.Root.Common.__init__. | |
| 59 @pretty_printer('JS::Rooted<long>') | |
| 60 def RootedJSID(value, cache): | |
| 61 return mozilla.Root.Rooted(value, cache, jsid) | |
| 62 @pretty_printer('JS::Handle<long>') | |
| 63 def HandleJSID(value, cache): | |
| 64 return mozilla.Root.Handle(value, cache, jsid) | |
| 65 @pretty_printer('JS::MutableHandle<long>') | |
| 66 def MutableHandleJSID(value, cache): | |
| 67 return mozilla.Root.MutableHandle(value, cache, jsid) |
