runtime: fix gdb support for channels.
R=rsc
CC=golang-dev
https://golang.org/cl/4418043
diff --git a/src/pkg/runtime/runtime-gdb.py b/src/pkg/runtime/runtime-gdb.py
index 08772a4..3f767fb 100644
--- a/src/pkg/runtime/runtime-gdb.py
+++ b/src/pkg/runtime/runtime-gdb.py
@@ -122,10 +122,13 @@
return str(self.val.type)
def children(self):
- ptr = self.val['recvdataq']
- for idx in range(self.val["qcount"]):
- yield ('[%d]' % idx, ptr['elem'])
- ptr = ptr['link']
+ # see chan.c chanbuf()
+ et = [x.type for x in self.val['free'].type.target().fields() if x.name == 'elem'][0]
+ ptr = (self.val.address + 1).cast(et.pointer())
+ for i in range(self.val["qcount"]):
+ j = (self.val["recvx"] + i) % self.val["dataqsiz"]
+ yield ('[%d]' % i, (ptr + j).dereference())
+
#
# Register all the *Printer classes above.
