diff options
Diffstat (limited to 'src/pkg/runtime/runtime-gdb.py')
| -rw-r--r-- | src/pkg/runtime/runtime-gdb.py | 83 |
1 files changed, 60 insertions, 23 deletions
diff --git a/src/pkg/runtime/runtime-gdb.py b/src/pkg/runtime/runtime-gdb.py index b74705e5f..629c39e98 100644 --- a/src/pkg/runtime/runtime-gdb.py +++ b/src/pkg/runtime/runtime-gdb.py @@ -5,7 +5,7 @@ """GDB Pretty printers and convenience functions for Go's runtime structures. This script is loaded by GDB when it finds a .debug_gdb_scripts -section in the compiled binary. The [68]l linkers emit this with a +section in the compiled binary. The [68]l linkers emit this with a path to this file based on the path to the runtime package. """ @@ -58,6 +58,8 @@ class SliceTypePrinter: return str(self.val.type)[6:] # skip 'struct ' def children(self): + if self.val["len"] > self.val["cap"]: + return ptr = self.val["array"] for idx in range(self.val["len"]): yield ('[%d]' % idx, (ptr + idx).dereference()) @@ -85,7 +87,7 @@ class MapTypePrinter: stab = self.val['st'] i = 0 for v in self.traverse_hash(stab): - yield ("[%d]" % i, v['key']) + yield ("[%d]" % i, v['key']) yield ("[%d]" % (i + 1), v['val']) i += 2 @@ -122,10 +124,10 @@ class ChanTypePrinter: return str(self.val.type) def children(self): - # 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"]): + # see chan.c chanbuf(). et is the type stolen from hchan<T>::recvq->first->elem + et = [x.type for x in self.val['recvq']['first'].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()) @@ -184,10 +186,10 @@ def lookup_type(name): except: pass +_rctp_type = gdb.lookup_type("struct runtime.commonType").pointer() +_rtp_type = gdb.lookup_type("struct runtime._type").pointer() -def iface_dtype(obj): - "Decode type of the data field of an eface or iface struct." - +def iface_commontype(obj): if is_iface(obj): go_type_ptr = obj['tab']['_type'] elif is_eface(obj): @@ -195,16 +197,43 @@ def iface_dtype(obj): else: return - ct = gdb.lookup_type("struct runtime.commonType").pointer() - dynamic_go_type = go_type_ptr['ptr'].cast(ct).dereference() + # sanity check: reflection type description ends in a loop. + tt = go_type_ptr['_type'].cast(_rtp_type).dereference()['_type'] + if tt != tt.cast(_rtp_type).dereference()['_type']: + return + + return go_type_ptr['ptr'].cast(_rctp_type).dereference() + + +def iface_dtype(obj): + "Decode type of the data field of an eface or iface struct." + # known issue: dtype_name decoded from runtime.commonType is "nested.Foo" + # but the dwarf table lists it as "full/path/to/nested.Foo" + + dynamic_go_type = iface_commontype(obj) + if dynamic_go_type is None: + return dtype_name = dynamic_go_type['string'].dereference()['str'].string() - type_size = int(dynamic_go_type['size']) - uintptr_size = int(dynamic_go_type['size'].type.sizeof) # size is itself an uintptr + dynamic_gdb_type = lookup_type(dtype_name) + if dynamic_gdb_type is None: + return + + type_size = int(dynamic_go_type['size']) + uintptr_size = int(dynamic_go_type['size'].type.sizeof) # size is itself an uintptr if type_size > uintptr_size: - dynamic_gdb_type = dynamic_gdb_type.pointer() + dynamic_gdb_type = dynamic_gdb_type.pointer() + return dynamic_gdb_type +def iface_dtype_name(obj): + "Decode type name of the data field of an eface or iface struct." + + dynamic_go_type = iface_commontype(obj) + if dynamic_go_type is None: + return + return dynamic_go_type['string'].dereference()['str'].string() + class IfacePrinter: """Pretty print interface values @@ -224,6 +253,10 @@ class IfacePrinter: dtype = iface_dtype(self.val) except: return "<bad dynamic type>" + + if dtype is None: # trouble looking up, print something reasonable + return "(%s)%s" % (iface_dtype_name(self.val), self.val['data']) + try: return self.val['data'].cast(dtype).dereference() except: @@ -244,7 +277,7 @@ goobjfile.pretty_printers.append(ifacematcher) class GoLenFunc(gdb.Function): "Length of strings, slices, maps or channels" - how = ((StringTypePrinter, 'len' ), + how = ((StringTypePrinter, 'len'), (SliceTypePrinter, 'len'), (MapTypePrinter, 'count'), (ChanTypePrinter, 'qcount')) @@ -293,7 +326,7 @@ class DTypeFunc(gdb.Function): # Commands # -sts = ( 'idle', 'runnable', 'running', 'syscall', 'waiting', 'moribund', 'dead', 'recovery') +sts = ('idle', 'runnable', 'running', 'syscall', 'waiting', 'moribund', 'dead', 'recovery') def linked_list(ptr, linkfield): while ptr: @@ -316,8 +349,8 @@ class GoroutinesCmd(gdb.Command): s = ' ' if ptr['m']: s = '*' - pc = ptr['sched']['pc'].cast(vp) - sp = ptr['sched']['sp'].cast(vp) + pc = ptr['sched']['pc'].cast(vp) + sp = ptr['sched']['sp'].cast(vp) blk = gdb.block_for_pc(long((pc))) print s, ptr['goid'], "%8s" % sts[long((ptr['status']))], blk.function @@ -359,10 +392,10 @@ class GoroutineCmd(gdb.Command): gdb.parse_and_eval('$sp = 0x%x' % long(sp)) try: gdb.execute(cmd) - finally: + finally: gdb.parse_and_eval('$pc = $save_pc') - gdb.parse_and_eval('$sp = $save_sp') - save_frame.select() + gdb.parse_and_eval('$sp = $save_sp') + save_frame.select() class GoIfaceCmd(gdb.Command): @@ -380,8 +413,12 @@ class GoIfaceCmd(gdb.Command): print "Can't parse ", obj, ": ", e continue - dtype = iface_dtype(obj) - if not dtype: + if obj['data'] == 0: + dtype = "nil" + else: + dtype = iface_dtype(obj) + + if dtype is None: print "Not an interface: ", obj.type continue |