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Code Issues Releases Wiki Activity

Reduce API flash usage by eliminating unnecessary template instantiations (#9452)

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This commit is contained in:
J. Nick Koston
2025-07-11 17:56:08 -10:00
committed by GitHub
parent 79b5fcf31a
commit ca5ee0ce07
3 changed files with 259 additions and 198 deletions
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42
script/api_protobuf/api_protobuf.py
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@@ -536,11 +536,26 @@ class MessageType(TypeInfo):
@property
def encode_func(self) -> str:
return f"encode_message<{self.cpp_type}>"
return "encode_message"
@property
def decode_length(self) -> str:
return f"value.as_message<{self.cpp_type}>()"
# Override to return None for message types because we can't use template-based
# decoding when the specific message type isn't known at compile time.
# Instead, we use the non-template decode_to_message() method which allows
# runtime polymorphism through virtual function calls.
return None
@property
def decode_length_content(self) -> str:
# Custom decode that doesn't use templates
return dedent(
f"""\
case {self.number}: {{
value.decode_to_message(this->{self.field_name});
return true;
}}"""
)
def dump(self, name: str) -> str:
o = f"{name}.dump_to(out);"
@@ -608,14 +623,18 @@ class EnumType(TypeInfo):
@property
def decode_varint(self) -> str:
return f"value.as_enum<{self.cpp_type}>()"
return f"static_cast<{self.cpp_type}>(value.as_uint32())"
default_value = ""
wire_type = WireType.VARINT # Uses wire type 0
@property
def encode_func(self) -> str:
return f"encode_enum<{self.cpp_type}>"
return "encode_uint32"
@property
def encode_content(self) -> str:
return f"buffer.{self.encode_func}({self.number}, static_cast<uint32_t>(this->{self.field_name}));"
def dump(self, name: str) -> str:
o = f"out.append(proto_enum_to_string<{self.cpp_type}>({name}));"
@@ -757,6 +776,16 @@ class RepeatedTypeInfo(TypeInfo):
@property
def decode_length_content(self) -> str:
content = self._ti.decode_length
if content is None and isinstance(self._ti, MessageType):
# Special handling for non-template message decoding
return dedent(
f"""\
case {self.number}: {{
this->{self.field_name}.emplace_back();
value.decode_to_message(this->{self.field_name}.back());
return true;
}}"""
)
if content is None:
return None
return dedent(
@@ -801,7 +830,10 @@ class RepeatedTypeInfo(TypeInfo):
@property
def encode_content(self) -> str:
o = f"for (auto {'' if self._ti_is_bool else '&'}it : this->{self.field_name}) {{\n"
o += f" buffer.{self._ti.encode_func}({self.number}, it, true);\n"
if isinstance(self._ti, EnumType):
o += f" buffer.{self._ti.encode_func}({self.number}, static_cast<uint32_t>(it), true);\n"
else:
o += f" buffer.{self._ti.encode_func}({self.number}, it, true);\n"
o += "}"
return o