mirror of
https://github.com/godotengine/godot.git
synced 2024-12-15 10:12:40 +08:00
119 lines
3.8 KiB
Python
119 lines
3.8 KiB
Python
"""
|
|
Load this file to your GDB session to enable pretty-printing of some Godot C++ types.
|
|
|
|
GDB command: `source misc/utility/godot_gdb_pretty_print.py`.
|
|
|
|
To load these automatically in Visual Studio Code, add the source command to
|
|
the `setupCommands` of your configuration in `launch.json`:
|
|
```json
|
|
"setupCommands": [
|
|
...
|
|
{
|
|
"description": "Load custom pretty-printers for Godot types.",
|
|
"text": "source ${workspaceFolder}/misc/utility/godot_gdb_pretty_print.py"
|
|
}
|
|
]
|
|
```
|
|
Other UIs that use GDB under the hood are likely to have their own ways to achieve this.
|
|
|
|
To debug this script it's easiest to use the interactive python from a command-line
|
|
GDB session. Stop at a breakpoint, then use python-interactive to enter the python shell
|
|
and acquire a `Value` object using `gdb.selected_frame().read_var("variable name")`.
|
|
From there you can figure out how to print it nicely.
|
|
"""
|
|
|
|
import re
|
|
|
|
import gdb # type: ignore
|
|
|
|
|
|
# Printer for Godot StringName variables.
|
|
class GodotStringNamePrinter:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
def to_string(self):
|
|
return self.value["_data"]["name"]["_cowdata"]["_ptr"]
|
|
|
|
# Hint that the object is string-like.
|
|
def display_hint(self):
|
|
return "string"
|
|
|
|
|
|
# Printer for Godot String variables.
|
|
class GodotStringPrinter:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
def to_string(self):
|
|
return self.value["_cowdata"]["_ptr"]
|
|
|
|
# Hint that the object is string-like.
|
|
def display_hint(self):
|
|
return "string"
|
|
|
|
|
|
# Printer for Godot Vector variables.
|
|
class GodotVectorPrinter:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
# The COW (Copy On Write) object does a bunch of pointer arithmetic to access
|
|
# its members.
|
|
# The offsets are constants on the C++ side, optimized out, so not accessible to us.
|
|
# I'll just hard code the observed values and hope they are the same forever.
|
|
# See core/templates/cowdata.h
|
|
SIZE_OFFSET = 8
|
|
DATA_OFFSET = 16
|
|
|
|
# Figures out the number of elements in the vector.
|
|
def get_size(self):
|
|
cowdata = self.value["_cowdata"]
|
|
if cowdata["_ptr"] == 0:
|
|
return 0
|
|
else:
|
|
# The ptr member of cowdata does not point to the beginning of the
|
|
# cowdata. It points to the beginning of the data section of the cowdata.
|
|
# To get to the length section, we must back up to the beginning of the struct,
|
|
# then move back forward to the size.
|
|
# cf. CowData::_get_size
|
|
ptr = cowdata["_ptr"].cast(gdb.lookup_type("uint8_t").pointer())
|
|
return int((ptr - self.DATA_OFFSET + self.SIZE_OFFSET).dereference())
|
|
|
|
# Lists children of the value, in this case the vector's items.
|
|
def children(self):
|
|
# Return nothing if ptr is null.
|
|
ptr = self.value["_cowdata"]["_ptr"]
|
|
if ptr == 0:
|
|
return
|
|
# Yield the items one by one.
|
|
for i in range(self.get_size()):
|
|
yield str(i), (ptr + i).dereference()
|
|
|
|
def to_string(self):
|
|
return "%s [%d]" % (self.value.type.name, self.get_size())
|
|
|
|
# Hint that the object is array-like.
|
|
def display_hint(self):
|
|
return "array"
|
|
|
|
|
|
VECTOR_REGEX = re.compile("^Vector<.*$")
|
|
|
|
|
|
# Tries to find a pretty printer for a debugger value.
|
|
def lookup_pretty_printer(value):
|
|
if value.type.name == "StringName":
|
|
return GodotStringNamePrinter(value)
|
|
if value.type.name == "String":
|
|
return GodotStringPrinter(value)
|
|
if value.type.name and VECTOR_REGEX.match(value.type.name):
|
|
return GodotVectorPrinter(value)
|
|
return None
|
|
|
|
|
|
# Register our printer lookup function.
|
|
# The first parameter could be used to limit the scope of the printer
|
|
# to a specific object file, but that is unnecessary for us.
|
|
gdb.printing.register_pretty_printer(None, lookup_pretty_printer)
|