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gh-118335: Configure Tier 2 interpreter at build time (#118339)

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The code for Tier 2 is now only compiled when configured
with `--enable-experimental-jit[=yes|interpreter]`.

We drop support for `PYTHON_UOPS` and -`Xuops`,
but you can disable the interpreter or JIT
at runtime by setting `PYTHON_JIT=0`.
You can also build it without enabling it by default
using `--enable-experimental-jit=yes-off`;
enable with `PYTHON_JIT=1`.

On Windows, the `build.bat` script supports
`--experimental-jit`, `--experimental-jit-off`,
`--experimental-interpreter`.

In the C code, `_Py_JIT` is defined as before
when the JIT is enabled; the new variable
`_Py_TIER2` is defined when the JIT *or* the
interpreter is enabled. It is actually a bitmask:
1: JIT; 2: default-off; 4: interpreter.
This commit is contained in:
Guido van Rossum 2024-04-30 18:26:34 -07:00 • committed by GitHub
parent 9c468e2c5d
commit 7d83f7bcc4
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GPG key ID: B5690EEEBB952194
32 changed files with 181 additions and 42 deletions
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5
Python/ceval.c
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@ -755,7 +755,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
_Py_CODEUNIT *next_instr;
PyObject **stack_pointer;
#ifndef _Py_JIT
#if defined(_Py_TIER2) && !defined(_Py_JIT)
/* Tier 2 interpreter state */
_PyExecutorObject *current_executor = NULL;
const _PyUOpInstruction *next_uop = NULL;
@ -959,6 +959,7 @@ resume_with_error:
goto error;
#ifdef _Py_TIER2
// Tier 2 is also here!
enter_tier_two:
@ -1113,6 +1114,8 @@ exit_to_trace:
#endif // _Py_JIT
#endif // _Py_TIER2
}
#if defined(__GNUC__)