1 files changed, 72 insertions, 0 deletions
diff --git a/js/src/gdb/mozilla/JSString.py b/js/src/gdb/mozilla/JSString.py
new file mode 100644
index 000000000..99d5ce987
--- /dev/null
+++ b/js/src/gdb/mozilla/JSString.py
@@ -0,0 +1,72 @@
+# Pretty-printers for SpiderMonkey strings.
+
+import gdb
+import mozilla.prettyprinters
+from mozilla.prettyprinters import pretty_printer, ptr_pretty_printer
+
+try:
+    chr(10000) # UPPER RIGHT PENCIL
+except ValueError as exc: # yuck, we are in Python 2.x, so chr() is 8-bit
+    chr = unichr # replace with teh unicodes
+
+# Forget any printers from previous loads of this module.
+mozilla.prettyprinters.clear_module_printers(__name__)
+
+# Cache information about the JSString type for this objfile.
+class JSStringTypeCache(object):
+    def __init__(self, cache):
+        dummy = gdb.Value(0).cast(cache.JSString_ptr_t)
+        self.ROPE_FLAGS = dummy['ROPE_FLAGS']
+        self.ATOM_BIT = dummy['ATOM_BIT']
+        self.INLINE_CHARS_BIT = dummy['INLINE_CHARS_BIT']
+        self.TYPE_FLAGS_MASK = dummy['TYPE_FLAGS_MASK']
+        self.LATIN1_CHARS_BIT = dummy['LATIN1_CHARS_BIT']
+
+class Common(mozilla.prettyprinters.Pointer):
+    def __init__(self, value, cache):
+        super(Common, self).__init__(value, cache)
+        if not cache.mod_JSString:
+            cache.mod_JSString = JSStringTypeCache(cache)
+        self.stc = cache.mod_JSString
+
+@ptr_pretty_printer("JSString")
+class JSStringPtr(Common):
+    def display_hint(self):
+        return "string"
+
+    def chars(self):
+        d = self.value['d']
+        length = d['u1']['length']
+        flags = d['u1']['flags']
+        is_rope = ((flags & self.stc.TYPE_FLAGS_MASK) == self.stc.ROPE_FLAGS)
+        if is_rope:
+            for c in JSStringPtr(d['s']['u2']['left'], self.cache).chars():
+                yield c
+            for c in JSStringPtr(d['s']['u3']['right'], self.cache).chars():
+                yield c
+        else:
+            is_inline = (flags & self.stc.INLINE_CHARS_BIT) != 0
+            is_latin1 = (flags & self.stc.LATIN1_CHARS_BIT) != 0
+            if is_inline:
+                if is_latin1:
+                    chars = d['inlineStorageLatin1']
+                else:
+                    chars = d['inlineStorageTwoByte']
+            else:
+                if is_latin1:
+                    chars = d['s']['u2']['nonInlineCharsLatin1']
+                else:
+                    chars = d['s']['u2']['nonInlineCharsTwoByte']
+            for i in range(int(length)):
+                yield chars[i]
+
+    def to_string(self):
+        s = u''
+        for c in self.chars():
+            s += chr(c)
+        return s
+
+@ptr_pretty_printer("JSAtom")
+class JSAtomPtr(Common):
+    def to_string(self):
+        return self.value.cast(self.cache.JSString_ptr_t)