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bpo-40222: "Zero cost" exception handling (GH-25729)

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"Zero cost" exception handling.

* Uses a lookup table to determine how to handle exceptions.
* Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements.
* Reduces the size of the frame object by about 60%.
This commit is contained in:
Mark Shannon 2021-05-07 15:19:19 +01:00 • committed by GitHub
parent b32c8e9795
commit adcd220556
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GPG key ID: 4AEE18F83AFDEB23
30 changed files with 6614 additions and 5687 deletions
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9
Python/marshal.c
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@ -525,6 +525,7 @@ w_complex_object(PyObject *v, char flag, WFILE *p)
w_object(co->co_name, p);
w_long(co->co_firstlineno, p);
w_object(co->co_linetable, p);
w_object(co->co_exceptiontable, p);
}
else if (PyObject_CheckBuffer(v)) {
/* Write unknown bytes-like objects as a bytes object */
@ -1313,6 +1314,7 @@ r_object(RFILE *p)
PyObject *name = NULL;
int firstlineno;
PyObject *linetable = NULL;
PyObject *exceptiontable = NULL;
idx = r_ref_reserve(flag, p);
if (idx < 0)
@ -1370,6 +1372,10 @@ r_object(RFILE *p)
linetable = r_object(p);
if (linetable == NULL)
goto code_error;
exceptiontable = r_object(p);
if (exceptiontable == NULL)
goto code_error;
if (PySys_Audit("code.__new__", "OOOiiiiii",
code, filename, name, argcount, posonlyargcount,
@ -1382,7 +1388,7 @@ r_object(RFILE *p)
nlocals, stacksize, flags,
code, consts, names, varnames,
freevars, cellvars, filename, name,
firstlineno, linetable);
firstlineno, linetable, exceptiontable);
v = r_ref_insert(v, idx, flag, p);
code_error:
@ -1395,6 +1401,7 @@ r_object(RFILE *p)
Py_XDECREF(filename);
Py_XDECREF(name);
Py_XDECREF(linetable);
Py_XDECREF(exceptiontable);
}
retval = v;
break;