summaryrefslogtreecommitdiff
path: root/src/main-gdb-head.py
diff options
context:
space:
mode:
authorBen Longbons <b.r.longbons@gmail.com>2013-10-14 15:00:12 -0700
committerBen Longbons <b.r.longbons@gmail.com>2013-10-15 21:50:46 -0700
commit3fa6f4b4c400c7354e05ac7bae128d4d9ee30e5c (patch)
treec6b3f39e51aeaf6ff04061bb264211086e7e3fcc /src/main-gdb-head.py
parent60d9e17f3719eca2eb4531f9f01976b1e26c411b (diff)
downloadtmwa-3fa6f4b4c400c7354e05ac7bae128d4d9ee30e5c.tar.gz
tmwa-3fa6f4b4c400c7354e05ac7bae128d4d9ee30e5c.tar.bz2
tmwa-3fa6f4b4c400c7354e05ac7bae128d4d9ee30e5c.tar.xz
tmwa-3fa6f4b4c400c7354e05ac7bae128d4d9ee30e5c.zip
Add infrastructure for debug pretty printers
Diffstat (limited to 'src/main-gdb-head.py')
-rw-r--r--src/main-gdb-head.py59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/main-gdb-head.py b/src/main-gdb-head.py
new file mode 100644
index 0000000..cfdce2b
--- /dev/null
+++ b/src/main-gdb-head.py
@@ -0,0 +1,59 @@
+# Work around awkwardness in gdb's python printers:
+# 1. In src/main-gdb-head.py, define the printer mechanism.
+# 2. In src/*/*.py, define all the printer classes.
+# 3. In src/main-gdb-tail.py, reflect to actually add the printers.
+
+# gdb sticks everything in one scope.
+# This lets us enumerate what *we* added.
+initial_globals = set(globals())
+
+def finish():
+ diff = set(globals()) - initial_globals
+ fp = FastPrinters()
+ # After this, don't access any more globals in this function.
+ global finish, initial_globals, FastPrinters
+ del finish, initial_globals, FastPrinters
+
+ for k in diff:
+ v = globals()[k]
+ if hasattr(v, 'children') or hasattr(v, 'to_string'):
+ fp.add_printer(v)
+
+ gdb.current_objfile().pretty_printers.append(fp)
+
+class FastPrinters(object):
+ ''' printer dispatch the way gdb *should* have done it
+ '''
+ __slots__ = ('name', 'enabled', 'printers')
+
+ def __init__(self):
+ self.name = 'tmwa'
+ self.enabled = True
+ self.printers = {}
+
+ def add_printer(self, cls):
+ assert hasattr(cls, 'enabled')
+ self.printers[cls.name] = cls
+
+ @property
+ def subprinters(self):
+ return self.printers.values()
+
+ def strip_templates(self, name, __pattern=re.compile('<[^<>]>')):
+ # TODO what about '<' and '>' as non-type template parameters?
+ changed = 1
+ while changed:
+ name, changed = __pattern.subn('', name)
+ return name
+
+ def __call__(self, value):
+ stype = gdb.types.get_basic_type(value.type).tag
+ #dtype = gdb.types.get_basic_type(value.dynamic_type).tag
+ if stype is None:
+ return
+
+ stype = self.strip_templates(stype)
+ p = self.printers.get(stype)
+ if p is not None and p.enabled:
+ return p(value)
+ return None