tint: add pretty printers for gdb and lldb
Currently supports pretty printing of: - tint::Utils::Vector, VectorRef, and Slice - tint::Utils::Hashset, Hashmap Change-Id: Ifbf2547b0f87d7fde8d9ff0dd458aa35c5fd57f4 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/106720 Reviewed-by: dan sinclair <dsinclair@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org> Commit-Queue: Antonio Maiorano <amaiorano@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
This commit is contained in:
Antonio Maiorano
Dawn LUCI CQ
parent
c3cbc35650
commit
14b5fb6f17
3
Doxyfile
3
Doxyfile
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@ -1008,7 +1008,8 @@ RECURSIVE = YES
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# Note that relative paths are relative to the directory from which doxygen is
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# run.
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EXCLUDE =
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EXCLUDE = src/tint/tint_gdb.py \
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src/tint/tint_lldb.py
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# The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
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# directories that are symbolic links (a Unix file system feature) are excluded
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@ -0,0 +1,249 @@
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# Copyright 2022 The Tint Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Pretty printers for the Tint project.
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# Add a line to your ~/.gdbinit to source this file, e.g.:
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#
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# source /path/to/dawn/src/tint/tint_gdb.py
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import gdb
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import gdb.printing
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from itertools import chain
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# When debugging this module, set _DEBUGGING = True so that re-sourcing this file in gdb replaces
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# the existing printers.
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_DEBUGGING = True
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# Enable to display other data members along with child elements of compound data types (arrays, etc.).
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# This is useful in debuggers like VS Code that doesn't display the `to_string()` result in the watch window.
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# OTOH, it's less useful when using gdb/lldb's print command.
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_DISPLAY_MEMBERS_AS_CHILDREN = False
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# Tips for debugging using VS Code:
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# - Set a breakpoint where you can view the types you want to debug/write pretty printers for.
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# - Debug Console: source /path/to/dawn/src/tint/tint_gdb.py
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# - To execute Python code, in the Debug Console:
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# -exec python foo = gdb.parse_and_eval('map.set_')
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# -exec python v = (foo['slots_']['impl_']['slice']['data'] + 8).dereference()['value']
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#
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# - Useful docs:
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# Python API: https://sourceware.org/gdb/onlinedocs/gdb/Python-API.html#Python-API
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# Especially:
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# Types: https://sourceware.org/gdb/onlinedocs/gdb/Types-In-Python.html#Types-In-Python
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# Values: https://sourceware.org/gdb/onlinedocs/gdb/Values-From-Inferior.html#Values-From-Inferior
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pp_set = gdb.printing.RegexpCollectionPrettyPrinter("tint")
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class Printer(object):
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'''Base class for Printers'''
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def __init__(self, val):
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self.val = val
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def template_type(self, index):
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'''Returns template type at index'''
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return self.val.type.template_argument(index)
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class UtilsSlicePrinter(Printer):
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'''Printer for tint::utils::Slice<T>'''
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def __init__(self, val):
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super(UtilsSlicePrinter, self).__init__(val)
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self.len = self.val['len']
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self.cap = self.val['cap']
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self.data = self.val['data']
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self.elem_type = self.data.type.target().unqualified()
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def length(self):
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return self.len
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def value_at(self, index):
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'''Returns array value at index'''
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return (self.data + index).dereference().cast(self.elem_type)
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def to_string(self):
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return 'length={} capacity={}'.format(self.len, self.cap)
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def members(self):
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if _DISPLAY_MEMBERS_AS_CHILDREN:
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return [
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('length', self.len),
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('capacity', self.cap),
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]
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else:
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return []
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def children(self):
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for m in self.members():
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yield m
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for i in range(self.len):
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yield str(i), self.value_at(i)
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def display_hint(self):
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return 'array'
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pp_set.add_printer('UtilsSlicePrinter',
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'^tint::utils::Slice<.*>$', UtilsSlicePrinter)
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class UtilsVectorPrinter(Printer):
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'''Printer for tint::utils::Vector<T, N>'''
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def __init__(self, val):
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super(UtilsVectorPrinter, self).__init__(val)
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self.slice = self.val['impl_']['slice']
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self.using_heap = self.slice['cap'] > self.template_type(1)
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def slice_printer(self):
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return UtilsSlicePrinter(self.slice)
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def to_string(self):
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return 'heap={} {}'.format(self.using_heap, self.slice)
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def members(self):
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if _DISPLAY_MEMBERS_AS_CHILDREN:
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return [
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('heap', self.using_heap),
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]
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else:
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return []
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def children(self):
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return chain(self.members(), self.slice_printer().children())
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def display_hint(self):
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return 'array'
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pp_set.add_printer(
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'UtilsVector', '^tint::utils::Vector<.*>$', UtilsVectorPrinter)
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class UtilsVectorRefPrinter(Printer):
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'''Printer for tint::utils::VectorRef<T>'''
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def __init__(self, val):
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super(UtilsVectorRefPrinter, self).__init__(val)
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self.slice = self.val['slice_']
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self.can_move = self.val['can_move_']
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def to_string(self):
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return 'can_move={} {}'.format(self.can_move, self.slice)
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def members(self):
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if _DISPLAY_MEMBERS_AS_CHILDREN:
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return [
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('can_move', self.can_move),
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]
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else:
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return []
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def children(self):
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return chain(self.members(), UtilsSlicePrinter(self.slice).children())
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def display_hint(self):
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return 'array'
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pp_set.add_printer(
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'UtilsVector', '^tint::utils::VectorRef<.*>$', UtilsVectorRefPrinter)
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class UtilsHashsetPrinter(Printer):
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'''Printer for Hashset<T, N, HASH, EQUAL>'''
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def __init__(self, val):
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super(UtilsHashsetPrinter, self).__init__(val)
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self.slice = UtilsVectorPrinter(self.val['slots_']).slice_printer()
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self.try_read_std_optional_func = self.try_read_std_optional
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def to_string(self):
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length = 0
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for slot in range(0, self.slice.length()):
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v = self.slice.value_at(slot)
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if v['hash'] != 0:
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length += 1
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return 'length={}'.format(length)
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def children(self):
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for slot in range(0, self.slice.length()):
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v = self.slice.value_at(slot)
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if v['hash'] != 0:
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value = v['value']
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# value is a std::optional, let's try to extract its value for display
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kvp = self.try_read_std_optional_func(slot, value)
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if kvp is None:
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# If we failed, just output the slot and value as is, which will use
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# the default visualizer for each.
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kvp = slot, value
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yield str(kvp[0]), kvp[1]
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def display_hint(self):
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return 'array'
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def try_read_std_optional(self, slot, value):
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try:
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# libstdc++
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v = value['_M_payload']['_M_payload']['_M_value']
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return slot, v
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# return str(kvp['key']), kvp['value']
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except:
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return None
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pp_set.add_printer(
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'UtilsHashset', '^tint::utils::Hashset<.*>$', UtilsHashsetPrinter)
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class UtilsHashmapPrinter(Printer):
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'''Printer for Hashmap<K, V, N, HASH, EQUAL>'''
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def __init__(self, val):
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super(UtilsHashmapPrinter, self).__init__(val)
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self.hash_set = UtilsHashsetPrinter(self.val['set_'])
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# Replace the lookup function so we can extract the key and value out of the std::optionals in the Hashset
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self.hash_set.try_read_std_optional_func = self.try_read_std_optional
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def to_string(self):
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return self.hash_set.to_string()
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def children(self):
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return self.hash_set.children()
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def display_hint(self):
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return 'array'
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def try_read_std_optional(self, slot, value):
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try:
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# libstdc++
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kvp = value['_M_payload']['_M_payload']['_M_value']
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return str(kvp['key']), kvp['value']
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except:
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pass
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# Failed, fall back on hash_set
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return self.hash_set.try_read_std_optional(slot, value)
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pp_set.add_printer(
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'UtilsHashmap', '^tint::utils::Hashmap<.*>$', UtilsHashmapPrinter)
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gdb.printing.register_pretty_printer(gdb, pp_set, replace=_DEBUGGING)
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@ -0,0 +1,397 @@
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# Copyright 2022 The Tint Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Pretty printers for the Tint project.
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#
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# If using lldb from command line, add a line to your ~/.lldbinit to import the printers:
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#
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# command script import /path/to/dawn/src/tint/tint_lldb.py
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#
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#
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# If using VS Code on MacOS with the Microsoft C/C++ extension, add the following to
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# your launch.json (make sure you specify an absolute path to tint_lldb.py):
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#
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# "name": "Launch",
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# "type": "cppdbg",
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# "request": "launch",
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# ...
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# "setupCommands": [
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# {
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# "description": "Load tint pretty printers",
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# "ignoreFailures": false,
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# "text": "command script import /path/to/dawn/src/tint/tint_lldb.py,
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# }
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# ]
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#
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# If using VS Code with the CodeLLDB extension (https://github.com/vadimcn/vscode-lldb),
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# add the following to your launch.json:
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#
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# "name": "Launch",
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# "type": "lldb",
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# "request": "launch",
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# ...
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# "initCommands": [
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# "command script import /path/to/dawn/src/tint/tint_lldb.py"
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# ]
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# Based on pretty printers for:
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# Rust: https://github.com/vadimcn/vscode-lldb/blob/master/formatters/rust.py
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# Dlang: https://github.com/Pure-D/dlang-debug/blob/master/lldb_dlang.py
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#
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#
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# Tips for debugging using VS Code:
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#
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# - Set a breakpoint where you can view the types you want to debug/write pretty printers for.
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# - Debug Console: -exec command script import /path/to/dawn/src/tint/tint_lldb.py
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# - You can re-run the above command to reload the printers after modifying the python script.
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# - Useful docs:
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# Formattesr: https://lldb.llvm.org/use/variable.html
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# Python API: https://lldb.llvm.org/python_api.html
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# Especially:
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# SBType: https://lldb.llvm.org/python_api/lldb.SBType.html
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# SBValue: https://lldb.llvm.org/python_api/lldb.SBValue.html
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from __future__ import print_function, division
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import sys
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import logging
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import re
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import lldb
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import types
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if sys.version_info[0] == 2:
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# python2-based LLDB accepts utf8-encoded ascii strings only.
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def to_lldb_str(s): return s.encode(
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'utf8', 'backslashreplace') if isinstance(s, unicode) else s
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range = xrange
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else:
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to_lldb_str = str
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string_encoding = "escape" # remove | unicode | escape
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log = logging.getLogger(__name__)
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module = sys.modules[__name__]
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tint_category = None
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def __lldb_init_module(debugger, dict):
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global tint_category
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tint_category = debugger.CreateCategory('tint')
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tint_category.SetEnabled(True)
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attach_synthetic_to_type(
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UtilsSlicePrinter, r'^tint::utils::Slice<.+>$', True)
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attach_synthetic_to_type(
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UtilsVectorPrinter, r'^tint::utils::Vector<.+>$', True)
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attach_synthetic_to_type(
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UtilsVectorRefPrinter, r'^tint::utils::VectorRef<.+>$', True)
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attach_synthetic_to_type(
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UtilsHashsetPrinter, r'^tint::utils::Hashset<.+>$', True)
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attach_synthetic_to_type(
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UtilsHashmapPrinter, r'^tint::utils::Hashmap<.+>$', True)
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def attach_synthetic_to_type(synth_class, type_name, is_regex=False):
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global module, tint_category
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synth = lldb.SBTypeSynthetic.CreateWithClassName(
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__name__ + '.' + synth_class.__name__)
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synth.SetOptions(lldb.eTypeOptionCascade)
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ret = tint_category.AddTypeSynthetic(
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lldb.SBTypeNameSpecifier(type_name, is_regex), synth)
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log.debug('attaching synthetic %s to "%s", is_regex=%s -> %s',
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synth_class.__name__, type_name, is_regex, ret)
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def summary_fn(valobj, dict): return get_synth_summary(
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synth_class, valobj, dict)
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# LLDB accesses summary fn's by name, so we need to create a unique one.
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summary_fn.__name__ = '_get_synth_summary_' + synth_class.__name__
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setattr(module, summary_fn.__name__, summary_fn)
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attach_summary_to_type(summary_fn, type_name, is_regex)
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def attach_summary_to_type(summary_fn, type_name, is_regex=False):
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global module, tint_category
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summary = lldb.SBTypeSummary.CreateWithFunctionName(
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__name__ + '.' + summary_fn.__name__)
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summary.SetOptions(lldb.eTypeOptionCascade)
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ret = tint_category.AddTypeSummary(
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lldb.SBTypeNameSpecifier(type_name, is_regex), summary)
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log.debug('attaching summary %s to "%s", is_regex=%s -> %s',
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summary_fn.__name__, type_name, is_regex, ret)
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def get_synth_summary(synth_class, valobj, dict):
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''''
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get_summary' is annoyingly not a part of the standard LLDB synth provider API.
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This trick allows us to share data extraction logic between synth providers and their sibling summary providers.
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'''
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synth = synth_class(valobj.GetNonSyntheticValue(), dict)
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synth.update()
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summary = synth.get_summary()
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return to_lldb_str(summary)
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def member(valobj, *chain):
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'''Performs chained GetChildMemberWithName lookups'''
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for name in chain:
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valobj = valobj.GetChildMemberWithName(name)
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return valobj
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class Printer(object):
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'''Base class for Printers'''
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def __init__(self, valobj, dict={}):
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self.valobj = valobj
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self.initialize()
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def initialize(self):
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return None
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def update(self):
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return False
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def num_children(self):
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return 0
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def has_children(self):
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return False
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def get_child_at_index(self, index):
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return None
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def get_child_index(self, name):
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return None
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def get_summary(self):
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return None
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def member(self, *chain):
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'''Performs chained GetChildMemberWithName lookups'''
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return member(self.valobj, *chain)
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def template_params(self):
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'''Returns list of template params values (as strings)'''
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type_name = self.valobj.GetTypeName()
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params = []
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level = 0
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start = 0
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for i, c in enumerate(type_name):
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if c == '<':
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level += 1
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if level == 1:
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start = i + 1
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elif c == '>':
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level -= 1
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if level == 0:
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||||
params.append(type_name[start:i].strip())
|
||||
elif c == ',' and level == 1:
|
||||
params.append(type_name[start:i].strip())
|
||||
start = i + 1
|
||||
return params
|
||||
|
||||
def template_param_at(self, index):
|
||||
'''Returns template param value at index (as string)'''
|
||||
return self.template_params()[index]
|
||||
|
||||
|
||||
class UtilsSlicePrinter(Printer):
|
||||
'''Printer for tint::utils::Slice<T>'''
|
||||
|
||||
def initialize(self):
|
||||
self.len = self.valobj.GetChildMemberWithName('len')
|
||||
self.cap = self.valobj.GetChildMemberWithName('cap')
|
||||
self.data = self.valobj.GetChildMemberWithName('data')
|
||||
self.elem_type = self.data.GetType().GetPointeeType()
|
||||
self.elem_size = self.elem_type.GetByteSize()
|
||||
|
||||
def get_summary(self):
|
||||
return 'length={} capacity={}'.format(self.len.GetValueAsUnsigned(), self.cap.GetValueAsUnsigned())
|
||||
|
||||
def num_children(self):
|
||||
# NOTE: VS Code on MacOS hangs if we try to expand something too large, so put an artificial limit
|
||||
# until we can figure out how to know if this is a valid instance.
|
||||
return min(self.len.GetValueAsUnsigned(), 256)
|
||||
|
||||
def has_children(self):
|
||||
return True
|
||||
|
||||
def get_child_at_index(self, index):
|
||||
try:
|
||||
if not 0 <= index < self.num_children():
|
||||
return None
|
||||
# TODO: return self.value_at(index)
|
||||
offset = index * self.elem_size
|
||||
return self.data.CreateChildAtOffset('[%s]' % index, offset, self.elem_type)
|
||||
except Exception as e:
|
||||
log.error('%s', e)
|
||||
raise
|
||||
|
||||
def value_at(self, index):
|
||||
'''Returns array value at index'''
|
||||
offset = index * self.elem_size
|
||||
return self.data.CreateChildAtOffset('[%s]' % index, offset, self.elem_type)
|
||||
|
||||
|
||||
class UtilsVectorPrinter(Printer):
|
||||
'''Printer for tint::utils::Vector<T, N>'''
|
||||
|
||||
def initialize(self):
|
||||
self.slice = self.member('impl_', 'slice')
|
||||
self.slice_printer = UtilsSlicePrinter(self.slice)
|
||||
self.fixed_size = int(self.template_param_at(1))
|
||||
self.cap = self.slice_printer.member('cap')
|
||||
|
||||
def get_summary(self):
|
||||
using_heap = self.cap.GetValueAsUnsigned() > self.fixed_size
|
||||
return 'heap={} {}'.format(using_heap, self.slice_printer.get_summary())
|
||||
|
||||
def num_children(self):
|
||||
return self.slice_printer.num_children()
|
||||
|
||||
def has_children(self):
|
||||
return self.slice_printer.has_children()
|
||||
|
||||
def get_child_at_index(self, index):
|
||||
return self.slice_printer.get_child_at_index(index)
|
||||
|
||||
def make_slice_printer(self):
|
||||
return UtilsSlicePrinter(self.slice)
|
||||
|
||||
|
||||
class UtilsVectorRefPrinter(Printer):
|
||||
'''Printer for tint::utils::VectorRef<T>'''
|
||||
|
||||
def initialize(self):
|
||||
self.slice = self.member('slice_')
|
||||
self.slice_printer = UtilsSlicePrinter(self.slice)
|
||||
self.can_move = self.member('can_move_')
|
||||
|
||||
def get_summary(self):
|
||||
return 'can_move={} {}'.format(self.can_move.GetValue(), self.slice_printer.get_summary())
|
||||
|
||||
def num_children(self):
|
||||
return self.slice_printer.num_children()
|
||||
|
||||
def has_children(self):
|
||||
return self.slice_printer.has_children()
|
||||
|
||||
def get_child_at_index(self, index):
|
||||
return self.slice_printer.get_child_at_index(index)
|
||||
|
||||
|
||||
class UtilsHashsetPrinter(Printer):
|
||||
'''Printer for Hashset<T, N, HASH, EQUAL>'''
|
||||
|
||||
def initialize(self):
|
||||
self.slice = UtilsVectorPrinter(
|
||||
self.member('slots_')).make_slice_printer()
|
||||
|
||||
self.try_read_std_optional_func = self.try_read_std_optional
|
||||
|
||||
def update(self):
|
||||
self.valid_slots = []
|
||||
for slot in range(0, self.slice.num_children()):
|
||||
v = self.slice.value_at(slot)
|
||||
if member(v, 'hash').GetValueAsUnsigned() != 0:
|
||||
self.valid_slots.append(slot)
|
||||
return False
|
||||
|
||||
def get_summary(self):
|
||||
return 'length={}'.format(self.num_children())
|
||||
|
||||
def num_children(self):
|
||||
return len(self.valid_slots)
|
||||
|
||||
def has_children(self):
|
||||
return True
|
||||
|
||||
def get_child_at_index(self, index):
|
||||
slot = self.valid_slots[index]
|
||||
v = self.slice.value_at(slot)
|
||||
value = member(v, 'value')
|
||||
|
||||
# value is a std::optional, let's try to extract its value for display
|
||||
kvp = self.try_read_std_optional_func(slot, value)
|
||||
if kvp is None:
|
||||
# If we failed, just output the slot and value as is, which will use
|
||||
# the default printer for std::optional.
|
||||
kvp = slot, value
|
||||
|
||||
return kvp[1].CreateChildAtOffset('[{}]'.format(kvp[0]), 0, kvp[1].GetType())
|
||||
|
||||
def try_read_std_optional(self, slot, value):
|
||||
try:
|
||||
# libc++
|
||||
v = value.EvaluateExpression('__val_')
|
||||
if v.name is not None:
|
||||
return slot, v
|
||||
|
||||
# libstdc++
|
||||
v = value.EvaluateExpression('_M_payload._M_payload._M_value')
|
||||
if v.name is not None:
|
||||
return slot, v
|
||||
return None
|
||||
except:
|
||||
return None
|
||||
|
||||
|
||||
class UtilsHashmapPrinter(Printer):
|
||||
'''Printer for Hashmap<K, V, N, HASH, EQUAL>'''
|
||||
|
||||
def initialize(self):
|
||||
self.hash_set = UtilsHashsetPrinter(self.member('set_'))
|
||||
# Replace the lookup function so we can extract the key and value out of the std::optionals in the Hashset
|
||||
self.hash_set.try_read_std_optional_func = self.try_read_std_optional
|
||||
|
||||
def update(self):
|
||||
self.hash_set.update()
|
||||
|
||||
def get_summary(self):
|
||||
return self.hash_set.get_summary()
|
||||
|
||||
def num_children(self):
|
||||
return self.hash_set.num_children()
|
||||
|
||||
def has_children(self):
|
||||
return self.hash_set.has_children()
|
||||
|
||||
def get_child_at_index(self, index):
|
||||
return self.hash_set.get_child_at_index(index)
|
||||
|
||||
def try_read_std_optional(self, slot, value):
|
||||
try:
|
||||
# libc++
|
||||
val = value.EvaluateExpression('__val_')
|
||||
k = val.EvaluateExpression('key')
|
||||
v = val.EvaluateExpression('value')
|
||||
if k.name is not None and v.name is not None:
|
||||
return k.GetValue(), v
|
||||
|
||||
# libstdc++
|
||||
val = value.EvaluateExpression('_M_payload._M_payload._M_value')
|
||||
k = val.EvaluateExpression('key')
|
||||
v = val.EvaluateExpression('value')
|
||||
if k.name is not None and v.name is not None:
|
||||
return k.GetValue(), v
|
||||
except:
|
||||
pass
|
||||
# Failed, fall back on hash_set
|
||||
return self.hash_set.try_read_std_optional(slot, value)
|
||||
Loading…
Reference in New Issue