golang gdb script hackery

gistfile1.diff

--- runtime-gdb.py	2015-05-05 17:03:21.520510629 +0100
+++ runtime-gdb-hacks.py	2015-05-05 17:05:24.416677753 +0100
@@ -369,6 +369,41 @@
 		ptr = ptr[linkfield]
 
 
+class AidanCmd(gdb.Command):
+	"List all goroutines."
+
+	def __init__(self):
+		gdb.Command.__init__(self, "info aidan", gdb.COMMAND_STACK, gdb.COMPLETE_NONE)
+
+	def invoke(self, _arg, _from_tty):
+		vp = gdb.lookup_type('void').pointer()
+		sv = SliceValue(gdb.parse_and_eval("'runtime.allgs'"))
+		print("num: " + str(sv.len))
+		for ptr in sv:
+			if ptr['atomicstatus'] == 6:  # 'gdead'
+				continue
+			s = ' '
+			if ptr['m']:
+				s = '*'
+			pc = ptr['sched']['pc'].cast(vp)
+			# python2 will not cast pc (type void*) to an int cleanly
+			# instead python2 and python3 work with the hex string representation
+			# of the void pointer which we can parse back into an int.
+			# int(pc) will not work.
+			try:
+				#python3 / newer versions of gdb
+				pc = int(pc)
+			except gdb.error:
+				# str(pc) can return things like
+				# "0x429d6c <runtime.gopark+284>", so
+				# chop at first space.
+				pc = int(str(pc).split(None, 1)[0], 16)
+			blk = gdb.block_for_pc(pc)
+			goid = ptr['goid']
+			print(s, ptr['goid'], "{0:8s}".format(sts[int(ptr['atomicstatus'])]), blk.function)
+			GoroutineCmd.invoke(self, str(goid) + ' bt', None)
+
+
 class GoroutinesCmd(gdb.Command):
 	"List all goroutines."
 
@@ -378,7 +413,9 @@
 	def invoke(self, _arg, _from_tty):
 		# args = gdb.string_to_argv(arg)
 		vp = gdb.lookup_type('void').pointer()
-		for ptr in SliceValue(gdb.parse_and_eval("'runtime.allgs'")):
+		sv = SliceValue(gdb.parse_and_eval("'runtime.allgs'"))
+		print("num: " + str(sv.len))
+		for ptr in sv:
 			if ptr['atomicstatus'] == 6:  # 'gdead'
 				continue
 			s = ' '
@@ -499,6 +536,7 @@
 GoLenFunc()
 GoCapFunc()
 DTypeFunc()
+AidanCmd()
 GoroutinesCmd()
 GoroutineCmd()
 GoIfaceCmd()