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adcd220556
"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%.
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
#include "Python.h"
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#include "opcode.h"
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/*[clinic input]
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module _opcode
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[clinic start generated code]*/
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/*[clinic end generated code: output=da39a3ee5e6b4b0d input=117442e66eb376e6]*/
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#include "clinic/_opcode.c.h"
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/*[clinic input]
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_opcode.stack_effect -> int
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opcode: int
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oparg: object = None
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/
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*
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jump: object = None
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Compute the stack effect of the opcode.
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[clinic start generated code]*/
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static int
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_opcode_stack_effect_impl(PyObject *module, int opcode, PyObject *oparg,
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PyObject *jump)
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/*[clinic end generated code: output=64a18f2ead954dbb input=461c9d4a44851898]*/
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{
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int effect;
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int oparg_int = 0;
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int jump_int;
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if (HAS_ARG(opcode)) {
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if (oparg == Py_None) {
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PyErr_SetString(PyExc_ValueError,
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"stack_effect: opcode requires oparg but oparg was not specified");
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return -1;
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}
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oparg_int = (int)PyLong_AsLong(oparg);
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if ((oparg_int == -1) && PyErr_Occurred()) {
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return -1;
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}
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}
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else if (oparg != Py_None) {
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PyErr_SetString(PyExc_ValueError,
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"stack_effect: opcode does not permit oparg but oparg was specified");
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return -1;
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}
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if (jump == Py_None) {
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jump_int = -1;
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}
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else if (jump == Py_True) {
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jump_int = 1;
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}
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else if (jump == Py_False) {
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jump_int = 0;
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}
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else {
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PyErr_SetString(PyExc_ValueError,
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"stack_effect: jump must be False, True or None");
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return -1;
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}
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if (IS_ARTIFICIAL(opcode)) {
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effect = PY_INVALID_STACK_EFFECT;
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}
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else {
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effect = PyCompile_OpcodeStackEffectWithJump(opcode, oparg_int, jump_int);
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}
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if (effect == PY_INVALID_STACK_EFFECT) {
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PyErr_SetString(PyExc_ValueError,
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"invalid opcode or oparg");
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return -1;
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}
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return effect;
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}
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static PyMethodDef
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opcode_functions[] = {
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_OPCODE_STACK_EFFECT_METHODDEF
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{NULL, NULL, 0, NULL}
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};
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static struct PyModuleDef opcodemodule = {
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PyModuleDef_HEAD_INIT,
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.m_name = "_opcode",
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.m_doc = "Opcode support module.",
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.m_size = 0,
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.m_methods = opcode_functions
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};
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PyMODINIT_FUNC
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PyInit__opcode(void)
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{
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return PyModuleDef_Init(&opcodemodule);
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}
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