pythongh-119786: Add jit.md. Move adaptive.md to a section of interpr…

…eter.md. (python#127175)

InternalDocs/README.md

@@ -34,9 +34,9 @@ Runtime Objects
 Program Execution
 ---
 
-- [The Interpreter](interpreter.md)
+- [The Bytecode Interpreter](interpreter.md)
 
-- [Adaptive Instruction Families](adaptive.md)
+- [The JIT](jit.md)
 
 - [Garbage Collector Design](garbage_collector.md)
 

InternalDocs/code_objects.md

@@ -18,6 +18,11 @@ Code objects are typically produced by the bytecode [compiler](compiler.md),
 although they are often written to disk by one process and read back in by another.
 The disk version of a code object is serialized using the
 [marshal](https://docs.python.org/dev/library/marshal.html) protocol.
+When a `CodeObject` is created, the function `_PyCode_Quicken()` from
+[`Python/specialize.c`](../Python/specialize.c) is called to initialize
+the caches of all adaptive instructions. This is required because the
+on-disk format is a sequence of bytes, and some of the caches need to be
+initialized with 16-bit values.
 
 Code objects are nominally immutable.
 Some fields (including `co_code_adaptive` and fields for runtime

InternalDocs/compiler.md

@@ -595,16 +595,6 @@ Objects
 * [Exception Handling](exception_handling.md): Describes the exception table
 
 
-Specializing Adaptive Interpreter
-=================================
-
-Adding a specializing, adaptive interpreter to CPython will bring significant
-performance improvements. These documents provide more information:
-
-* [PEP 659: Specializing Adaptive Interpreter](https://peps.python.org/pep-0659/).
-* [Adding or extending a family of adaptive instructions](adaptive.md)
-
-
 References
 ==========