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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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6
Objects/codeobject.c
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@ -1496,6 +1496,8 @@ PyCode_GetFreevars(PyCodeObject *code)
return _PyCode_GetFreevars(code);
}
#ifdef _Py_TIER2
static void
clear_executors(PyCodeObject *co)
{
@ -1515,6 +1517,8 @@ _PyCode_Clear_Executors(PyCodeObject *code)
clear_executors(code);
}
#endif
static void
deopt_code(PyCodeObject *code, _Py_CODEUNIT *instructions)
{
@ -1739,9 +1743,11 @@ code_dealloc(PyCodeObject *co)
PyMem_Free(co_extra);
}
#ifdef _Py_TIER2
if (co->co_executors != NULL) {
clear_executors(co);
}
#endif
Py_XDECREF(co->co_consts);
Py_XDECREF(co->co_names);

4
Objects/object.c
View file

@ -2281,9 +2281,11 @@ static PyTypeObject* static_types[] = {
&_PyBufferWrapper_Type,
&_PyContextTokenMissing_Type,
&_PyCoroWrapper_Type,
#ifdef _Py_TIER2
&_PyCounterExecutor_Type,
&_PyCounterOptimizer_Type,
&_PyDefaultOptimizer_Type,
#endif
&_Py_GenericAliasIterType,
&_PyHamtItems_Type,
&_PyHamtKeys_Type,
@ -2304,8 +2306,10 @@ static PyTypeObject* static_types[] = {
&_PyPositionsIterator,
&_PyUnicodeASCIIIter_Type,
&_PyUnion_Type,
#ifdef _Py_TIER2
&_PyUOpExecutor_Type,
&_PyUOpOptimizer_Type,
#endif
&_PyWeakref_CallableProxyType,
&_PyWeakref_ProxyType,
&_PyWeakref_RefType,