Support enum value references in constructor arguments

[johnsonlee]

Summary

Add support for tracking and extracting enum constant references when one enum's constructor takes another enum as an argument. This enables proper analysis of cross-enum dependencies in Java code.

Changes

• New EnumValueReference data class in Node.kt: Represents a reference from one enum's constructor argument to another enum constant (e.g., Priority.HIGH)

• Enhanced SootUpAdapter:

  • Added tracking of static field reads to detect enum constant references in bytecode patterns like $stack1 = getstatic Priority.HIGH
  • Extended extractValueFromArg() to handle direct JFieldRef arguments in constructor calls
  • Validates that field type matches declaring class to correctly identify enum constants

• Test fixtures: Added three new enum test classes:

  • Priority: Simple enum with primitive constructor arguments
  • TaskConfig: Enum with another enum as constructor argument
  • TaskConfigWithId: Enum with mixed arguments (primitive + enum reference)

• Comprehensive test suite (EnumValueReferenceTest):

  • Verifies extraction of single enum references from TaskConfig
  • Tests mixed constructor arguments (int + enum reference) in TaskConfigWithId
  • Regression test ensuring primitive enum values still extract correctly

Implementation Details

The solution detects the bytecode pattern where enum constants are loaded via getstatic instructions and passed to enum constructors. The EnumValueReference object stores both the fully qualified enum class name and the constant name, allowing downstream analysis to resolve cross-enum relationships.