add array support for JDWP DSL (#74)

* add array support for JDWP DSL

* fix schema bugs

* update arraytype in AllClasses command

* update arraytype in AllClasses command

remove error type

* fix out and reply mismatch

projects/jdwp/defs/command_sets/virtual_machine.py

@@ -0,0 +1,64 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+
+"""JDWP Commands for ThreadReference Command Set."""
+
+from projects.jdwp.defs.schema import (
+    Command,
+    Field,
+    Struct,
+    Type,
+    Array,
+    CommandSet,
+    ArrayLength,
+    IntegralType,
+)
+from projects.jdwp.defs.constants import ErrorType
+
+
+__AllClasses_reply_classes = Field(
+    "classes",
+    ArrayLength(IntegralType.INT),
+    "Number of reference type that follow",
+)
+
+
+__AllClasses_reply_classesArray_element = Struct(
+    [
+        Field("refTypeTag", IntegralType.BYTE, "Kind of following reference type"),
+        Field("typeID", Type.REFERENCE_TYPE_ID, "Loaded reference type"),
+        Field(
+            "signature", Type.STRING, "The JNI signature of the loaded reference type"
+        ),
+        Field("status", IntegralType.INT, "The current class status"),
+    ]
+)
+
+__AllClasses_reply = Struct(
+    [
+        __AllClasses_reply_classes,
+        Field(
+            "classesArray",
+            Array(__AllClasses_reply_classesArray_element, __AllClasses_reply_classes),
+            "Array of reference type.",
+        ),
+    ]
+)
+
+AllClasses = Command(
+    name="AllClasses",
+    id=3,
+    out=None,
+    reply=__AllClasses_reply,
+    error={
+        ErrorType.VM_DEAD,
+    },
+)
+
+
+VirtualMachine = CommandSet(
+    name="VirtualMachine",
+    id=1,
+    commands=[
+        AllClasses,
+    ],
+)

projects/jdwp/defs/schema.py

@@ -2,8 +2,9 @@
 
 """Basic types for JDWP messages."""
 
+from __future__ import annotations
 from dataclasses import dataclass
-from typing import Optional
+from typing import Optional, Generic, TypeVar
 from enum import Enum
 from collections.abc import Set, Sequence
 
@@ -14,8 +15,6 @@ class PrimitiveType(Enum):
     """Primitive type class."""
 
     STRING = "string"
-    INT = "int"
-    BYTE = "byte"
     BOOLEAN = "boolean"
     DICT = "dict"
     REFERENCE_TYPE_ID = "referenceTypeID"
@@ -32,10 +31,26 @@ class PrimitiveType(Enum):
     LOCATION = "location"
 
 
-class Array(Enum):
+class IntegralType(Enum):
+    """Integral type class."""
+
+    INT = "int"
+    BYTE = "byte"
+
+
+@dataclass(frozen=True)
+class ArrayLength:
+    """Array length class."""
+
+    type: IntegralType
+
+
+@dataclass(frozen=True)
+class Array:
     """Array class type."""
 
-    pass
+    element_type: Struct
+    length: Field[ArrayLength]
 
 
 class TaggedUnion(Enum):
@@ -44,15 +59,17 @@ class TaggedUnion(Enum):
     pass
 
 
-Type = PrimitiveType | Array | TaggedUnion
+Type = PrimitiveType | Array | TaggedUnion | IntegralType | ArrayLength
+
+T = TypeVar("T", bound=Type)
 
 
 @dataclass(frozen=True)
-class Field:
+class Field(Generic[T]):
     """Field class."""
 
     name: str
-    type: Type
+    type: T
     description: str