main+ir: do register allocation + show updated register names

compiler/__main__.py

@@ -63,8 +63,13 @@ def main():
 
         print("\n---\n", repr(context))
 
+        register_alloc = optimizations.RegisterAllocation(intermediate_representation)
+        register_alloc.analyze()
+
         print_ir(intermediate_representation)
 
+        print(ir.IRRegister.get_registers())
+
     except CompilationError as e:
         e.location.source = data
         print(f"{e}\n{e.location.show_in_source()}", file=sys.stderr)

compiler/ir.py

@@ -167,6 +167,14 @@ class IRRegister(IRAssignable):
             return f"%r{self.real}"
         return f"%r{self.id}"
 
+    @classmethod
+    def get_registers(cls) -> str:
+        messages = []
+        for register in cls.registers.values():
+            messages += [f"%r{register.id} -> {register.codegen()}"]
+
+        return "\n".join(messages)
+
 
 class IRVariable(IRAssignable):
     def __init__(self, location: SourceLocation, fq_identifier: str):