cpython/Objects/codeobject.c at 2.7 · python-emscripten/cpython · GitHub

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#include "Python.h"

#include "code.h"

#include "structmember.h"

#define NAME_CHARS \

"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"

/* all_name_chars(s): true iff all chars in s are valid NAME_CHARS */

static int

all_name_chars(PyObject *o)

{

static char ok_name_char[256];

static const unsigned char *name_chars = (unsigned char *)NAME_CHARS;

const unsigned char *s, *e;

if (ok_name_char[*name_chars] == 0) {

const unsigned char *p;

for (p = name_chars; *p; p++)

ok_name_char[*p] = 1;

}

s = (unsigned char *)PyString_AS_STRING(o);

e = s + PyString_GET_SIZE(o);

while (s != e) {

if (ok_name_char[*s++] == 0)

return 0;

}

return 1;

}

static void

intern_strings(PyObject *tuple)

{

Py_ssize_t i;

for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {

PyObject *v = PyTuple_GET_ITEM(tuple, i);

if (v == NULL || !PyString_CheckExact(v)) {

Py_FatalError("non-string found in code slot");

}

PyString_InternInPlace(&PyTuple_GET_ITEM(tuple, i));

}

/* Intern selected string constants */

static int

intern_string_constants(PyObject *tuple)

{

int modified = 0;

Py_ssize_t i;

for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {

PyObject *v = PyTuple_GET_ITEM(tuple, i);

if (PyString_CheckExact(v)) {

if (all_name_chars(v)) {

PyObject *w = v;

PyString_InternInPlace(&v);

if (w != v) {

PyTuple_SET_ITEM(tuple, i, v);

modified = 1;

}

else if (PyTuple_CheckExact(v)) {

intern_string_constants(v);

}

else if (PyFrozenSet_CheckExact(v)) {

PyObject *w = v;

PyObject *tmp = PySequence_Tuple(v);

if (tmp == NULL) {

PyErr_Clear();

continue;

}

if (intern_string_constants(tmp)) {

v = PyFrozenSet_New(tmp);

if (v == NULL) {

PyErr_Clear();

}

else {

PyTuple_SET_ITEM(tuple, i, v);

Py_DECREF(w);

modified = 1;

}

Py_DECREF(tmp);

}

return modified;

}

PyCodeObject *

PyCode_New(int argcount, int nlocals, int stacksize, int flags,

PyObject *code, PyObject *consts, PyObject *names,

PyObject *varnames, PyObject *freevars, PyObject *cellvars,

PyObject *filename, PyObject *name, int firstlineno,

PyObject *lnotab)

{

PyCodeObject *co;

/* Check argument types */

if (argcount < 0 || nlocals < 0 ||

code == NULL ||

consts == NULL || !PyTuple_Check(consts) ||

names == NULL || !PyTuple_Check(names) ||

varnames == NULL || !PyTuple_Check(varnames) ||

freevars == NULL || !PyTuple_Check(freevars) ||

cellvars == NULL || !PyTuple_Check(cellvars) ||

name == NULL || !PyString_Check(name) ||

filename == NULL || !PyString_Check(filename) ||

lnotab == NULL || !PyString_Check(lnotab) ||

!PyObject_CheckReadBuffer(code)) {

PyErr_BadInternalCall();

return NULL;

}

intern_strings(names);

intern_strings(varnames);

intern_strings(freevars);

intern_strings(cellvars);

intern_string_constants(consts);

co = PyObject_NEW(PyCodeObject, &PyCode_Type);

if (co != NULL) {

co->co_argcount = argcount;

co->co_nlocals = nlocals;

co->co_stacksize = stacksize;

co->co_flags = flags;

Py_INCREF(code);

co->co_code = code;

Py_INCREF(consts);

co->co_consts = consts;

Py_INCREF(names);

co->co_names = names;

Py_INCREF(varnames);

co->co_varnames = varnames;

Py_INCREF(freevars);

co->co_freevars = freevars;

Py_INCREF(cellvars);

co->co_cellvars = cellvars;

Py_INCREF(filename);

co->co_filename = filename;

Py_INCREF(name);

co->co_name = name;

co->co_firstlineno = firstlineno;

Py_INCREF(lnotab);

co->co_lnotab = lnotab;

co->co_zombieframe = NULL;

co->co_weakreflist = NULL;

}

return co;

}

PyCodeObject *

PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)

{

static PyObject *emptystring = NULL;

static PyObject *nulltuple = NULL;

PyObject *filename_ob = NULL;

PyObject *funcname_ob = NULL;

PyCodeObject *result = NULL;

if (emptystring == NULL) {

emptystring = PyString_FromString("");

if (emptystring == NULL)

goto failed;

}

if (nulltuple == NULL) {

nulltuple = PyTuple_New(0);

if (nulltuple == NULL)

goto failed;

}

funcname_ob = PyString_FromString(funcname);

if (funcname_ob == NULL)

goto failed;

filename_ob = PyString_FromString(filename);

if (filename_ob == NULL)

goto failed;

result = PyCode_New(0, /* argcount */

0, /* nlocals */

0, /* stacksize */

0, /* flags */

emptystring, /* code */

nulltuple, /* consts */

nulltuple, /* names */

nulltuple, /* varnames */

nulltuple, /* freevars */

nulltuple, /* cellvars */

filename_ob, /* filename */

funcname_ob, /* name */

firstlineno, /* firstlineno */

emptystring /* lnotab */

);

failed:

Py_XDECREF(funcname_ob);

Py_XDECREF(filename_ob);

return result;

}

#define OFF(x) offsetof(PyCodeObject, x)

static PyMemberDef code_memberlist[] = {

{"co_argcount", T_INT, OFF(co_argcount), READONLY},

{"co_nlocals", T_INT, OFF(co_nlocals), READONLY},

{"co_stacksize",T_INT, OFF(co_stacksize), READONLY},

{"co_flags", T_INT, OFF(co_flags), READONLY},

{"co_code", T_OBJECT, OFF(co_code), READONLY},

{"co_consts", T_OBJECT, OFF(co_consts), READONLY},

{"co_names", T_OBJECT, OFF(co_names), READONLY},

{"co_varnames", T_OBJECT, OFF(co_varnames), READONLY},

{"co_freevars", T_OBJECT, OFF(co_freevars), READONLY},

{"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY},

{"co_filename", T_OBJECT, OFF(co_filename), READONLY},

{"co_name", T_OBJECT, OFF(co_name), READONLY},

{"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY},

{"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY},

{NULL} /* Sentinel */

};

/* Helper for code_new: return a shallow copy of a tuple that is

guaranteed to contain exact strings, by converting string subclasses

to exact strings and complaining if a non-string is found. */

static PyObject*

validate_and_copy_tuple(PyObject *tup)

{

PyObject *newtuple;

PyObject *item;

Py_ssize_t i, len;

len = PyTuple_GET_SIZE(tup);

newtuple = PyTuple_New(len);

if (newtuple == NULL)

return NULL;

for (i = 0; i < len; i++) {

item = PyTuple_GET_ITEM(tup, i);

if (PyString_CheckExact(item)) {

Py_INCREF(item);

}

else if (!PyString_Check(item)) {

PyErr_Format(

PyExc_TypeError,

"name tuples must contain only "

"strings, not '%.500s'",

item->ob_type->tp_name);

Py_DECREF(newtuple);

return NULL;

}

else {

item = PyString_FromStringAndSize(

PyString_AS_STRING(item),

PyString_GET_SIZE(item));

if (item == NULL) {

Py_DECREF(newtuple);

return NULL;

}

PyTuple_SET_ITEM(newtuple, i, item);

}

return newtuple;

}

PyDoc_STRVAR(code_doc,

"code(argcount, nlocals, stacksize, flags, codestring, constants, names,\n\

varnames, filename, name, firstlineno, lnotab[, freevars[, cellvars]])\n\

\n\

Create a code object. Not for the faint of heart.");

static PyObject *

code_new(PyTypeObject *type, PyObject *args, PyObject *kw)

{

int argcount;

int nlocals;

int stacksize;

int flags;

PyObject *co = NULL;

PyObject *code;

PyObject *consts;

PyObject *names, *ournames = NULL;

PyObject *varnames, *ourvarnames = NULL;

PyObject *freevars = NULL, *ourfreevars = NULL;

PyObject *cellvars = NULL, *ourcellvars = NULL;

PyObject *filename;

PyObject *name;

int firstlineno;

PyObject *lnotab;

if (!PyArg_ParseTuple(args, "iiiiSO!O!O!SSiS|O!O!:code",

&argcount, &nlocals, &stacksize, &flags,

&code,

&PyTuple_Type, &consts,

&PyTuple_Type, &names,

&PyTuple_Type, &varnames,

&filename, &name,

&firstlineno, &lnotab,

&PyTuple_Type, &freevars,

&PyTuple_Type, &cellvars))

return NULL;

if (argcount < 0) {

PyErr_SetString(

PyExc_ValueError,

"code: argcount must not be negative");

goto cleanup;

}

if (nlocals < 0) {

PyErr_SetString(

PyExc_ValueError,

"code: nlocals must not be negative");

goto cleanup;

}

ournames = validate_and_copy_tuple(names);

if (ournames == NULL)

goto cleanup;

ourvarnames = validate_and_copy_tuple(varnames);

if (ourvarnames == NULL)

goto cleanup;

if (freevars)

ourfreevars = validate_and_copy_tuple(freevars);

else

ourfreevars = PyTuple_New(0);

if (ourfreevars == NULL)

goto cleanup;

if (cellvars)

ourcellvars = validate_and_copy_tuple(cellvars);

else

ourcellvars = PyTuple_New(0);

if (ourcellvars == NULL)

goto cleanup;

co = (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags,

code, consts, ournames, ourvarnames,

ourfreevars, ourcellvars, filename,

name, firstlineno, lnotab);

cleanup:

Py_XDECREF(ournames);

Py_XDECREF(ourvarnames);

Py_XDECREF(ourfreevars);

Py_XDECREF(ourcellvars);

return co;

}

static void

code_dealloc(PyCodeObject *co)

{

Py_XDECREF(co->co_code);

Py_XDECREF(co->co_consts);

Py_XDECREF(co->co_names);

Py_XDECREF(co->co_varnames);

Py_XDECREF(co->co_freevars);

Py_XDECREF(co->co_cellvars);

Py_XDECREF(co->co_filename);

Py_XDECREF(co->co_name);

Py_XDECREF(co->co_lnotab);

if (co->co_zombieframe != NULL)

PyObject_GC_Del(co->co_zombieframe);

if (co->co_weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject*)co);

PyObject_DEL(co);

}

static PyObject *

code_repr(PyCodeObject *co)

{

char buf[500];

int lineno = -1;

char *filename = "???";

char *name = "???";

if (co->co_firstlineno != 0)

lineno = co->co_firstlineno;

if (co->co_filename && PyString_Check(co->co_filename))

filename = PyString_AS_STRING(co->co_filename);

if (co->co_name && PyString_Check(co->co_name))

name = PyString_AS_STRING(co->co_name);

PyOS_snprintf(buf, sizeof(buf),

"<code object %.100s at %p, file \"%.300s\", line %d>",

name, co, filename, lineno);

return PyString_FromString(buf);

}

static int

code_compare(PyCodeObject *co, PyCodeObject *cp)

{

int cmp;

cmp = PyObject_Compare(co->co_name, cp->co_name);

if (cmp) return cmp;

cmp = co->co_argcount - cp->co_argcount;

if (cmp) goto normalize;

cmp = co->co_nlocals - cp->co_nlocals;

if (cmp) goto normalize;

cmp = co->co_flags - cp->co_flags;

if (cmp) goto normalize;

cmp = co->co_firstlineno - cp->co_firstlineno;

if (cmp) goto normalize;

cmp = PyObject_Compare(co->co_code, cp->co_code);

if (cmp) return cmp;

cmp = PyObject_Compare(co->co_consts, cp->co_consts);

if (cmp) return cmp;

cmp = PyObject_Compare(co->co_names, cp->co_names);

if (cmp) return cmp;

cmp = PyObject_Compare(co->co_varnames, cp->co_varnames);

if (cmp) return cmp;

cmp = PyObject_Compare(co->co_freevars, cp->co_freevars);

if (cmp) return cmp;

cmp = PyObject_Compare(co->co_cellvars, cp->co_cellvars);

return cmp;

normalize:

if (cmp > 0)

return 1;

else if (cmp < 0)

return -1;

else

return 0;

}

PyObject*

_PyCode_ConstantKey(PyObject *op)

{

PyObject *key;

/* Py_None is a singleton */

if (op == Py_None

|| _PyAnyInt_CheckExact(op)

|| PyBool_Check(op)

|| PyBytes_CheckExact(op)

#ifdef Py_USING_UNICODE

|| PyUnicode_CheckExact(op)

#endif

/* code_richcompare() uses _PyCode_ConstantKey() internally */

|| PyCode_Check(op)) {

key = PyTuple_Pack(2, Py_TYPE(op), op);

}

else if (PyFloat_CheckExact(op)) {

double d = PyFloat_AS_DOUBLE(op);

/* all we need is to make the tuple different in either the 0.0

* or -0.0 case from all others, just to avoid the "coercion".

if (d == 0.0 && copysign(1.0, d) < 0.0)

key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None);

else

key = PyTuple_Pack(2, Py_TYPE(op), op);

}

#ifndef WITHOUT_COMPLEX

else if (PyComplex_CheckExact(op)) {

Py_complex z;

int real_negzero, imag_negzero;

/* For the complex case we must make complex(x, 0.)

different from complex(x, -0.) and complex(0., y)

different from complex(-0., y), for any x and y.

All four complex zeros must be distinguished.*/

z = PyComplex_AsCComplex(op);

real_negzero = z.real == 0.0 && copysign(1.0, z.real) < 0.0;

imag_negzero = z.imag == 0.0 && copysign(1.0, z.imag) < 0.0;

/* use True, False and None singleton as tags for the real and imag

* sign, to make tuples different */

if (real_negzero && imag_negzero) {

key = PyTuple_Pack(3, Py_TYPE(op), op, Py_True);

}

else if (imag_negzero) {

key = PyTuple_Pack(3, Py_TYPE(op), op, Py_False);

}

else if (real_negzero) {

key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None);

}

else {

key = PyTuple_Pack(2, Py_TYPE(op), op);

}

#endif

else if (PyTuple_CheckExact(op)) {

Py_ssize_t i, len;

PyObject *tuple;

len = PyTuple_GET_SIZE(op);

tuple = PyTuple_New(len);

if (tuple == NULL)

return NULL;

for (i=0; i < len; i++) {

PyObject *item, *item_key;

item = PyTuple_GET_ITEM(op, i);

item_key = _PyCode_ConstantKey(item);

if (item_key == NULL) {

Py_DECREF(tuple);

return NULL;

}

PyTuple_SET_ITEM(tuple, i, item_key);

}

key = PyTuple_Pack(3, Py_TYPE(op), op, tuple);

Py_DECREF(tuple);

}

else if (PyFrozenSet_CheckExact(op)) {

Py_ssize_t pos = 0;

PyObject *item;

long hash;

Py_ssize_t i, len;

PyObject *tuple, *set;

len = PySet_GET_SIZE(op);

tuple = PyTuple_New(len);

if (tuple == NULL)

return NULL;

i = 0;

while (_PySet_NextEntry(op, &pos, &item, &hash)) {

PyObject *item_key;

item_key = _PyCode_ConstantKey(item);

if (item_key == NULL) {

Py_DECREF(tuple);

return NULL;

}

assert(i < len);

PyTuple_SET_ITEM(tuple, i, item_key);

i++;

}

set = PyFrozenSet_New(tuple);

Py_DECREF(tuple);

if (set == NULL)

return NULL;

key = PyTuple_Pack(3, Py_TYPE(op), op, set);

Py_DECREF(set);

return key;

}

else {

/* for other types, use the object identifier as a unique identifier

* to ensure that they are seen as unequal. */

PyObject *obj_id = PyLong_FromVoidPtr(op);

if (obj_id == NULL)

return NULL;

key = PyTuple_Pack(3, Py_TYPE(op), op, obj_id);

Py_DECREF(obj_id);

}

return key;

}

static PyObject *

code_richcompare(PyObject *self, PyObject *other, int op)

{

PyCodeObject *co, *cp;

int eq;

PyObject *consts1, *consts2;

PyObject *res;

if ((op != Py_EQ && op != Py_NE) ||

!PyCode_Check(self) ||

!PyCode_Check(other)) {

/* Py3K warning if types are not equal and comparison

isn't == or != */

if (PyErr_WarnPy3k("code inequality comparisons not supported "

"in 3.x", 1) < 0) {

return NULL;

}

Py_INCREF(Py_NotImplemented);

return Py_NotImplemented;

}

co = (PyCodeObject *)self;

cp = (PyCodeObject *)other;

eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);

if (eq <= 0) goto unequal;

eq = co->co_argcount == cp->co_argcount;

if (!eq) goto unequal;

eq = co->co_nlocals == cp->co_nlocals;

if (!eq) goto unequal;

eq = co->co_flags == cp->co_flags;

if (!eq) goto unequal;

eq = co->co_firstlineno == cp->co_firstlineno;

if (!eq) goto unequal;

eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ);

if (eq <= 0) goto unequal;

/* compare constants */

consts1 = _PyCode_ConstantKey(co->co_consts);

if (!consts1)

return NULL;

consts2 = _PyCode_ConstantKey(cp->co_consts);

if (!consts2) {

Py_DECREF(consts1);

return NULL;

}

eq = PyObject_RichCompareBool(consts1, consts2, Py_EQ);

Py_DECREF(consts1);

Py_DECREF(consts2);

if (eq <= 0) goto unequal;

eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);

if (eq <= 0) goto unequal;

eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ);

if (eq <= 0) goto unequal;

eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ);

if (eq <= 0) goto unequal;

eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ);

if (eq <= 0) goto unequal;

if (op == Py_EQ)

res = Py_True;

else

res = Py_False;

goto done;

unequal:

if (eq < 0)

return NULL;

if (op == Py_NE)

res = Py_True;

else

res = Py_False;

done:

Py_INCREF(res);

return res;

}

static long

code_hash(PyCodeObject *co)

{

long h, h0, h1, h2, h3, h4, h5, h6;

h0 = PyObject_Hash(co->co_name);

if (h0 == -1) return -1;

h1 = PyObject_Hash(co->co_code);

if (h1 == -1) return -1;

h2 = PyObject_Hash(co->co_consts);

if (h2 == -1) return -1;

h3 = PyObject_Hash(co->co_names);

if (h3 == -1) return -1;

h4 = PyObject_Hash(co->co_varnames);

if (h4 == -1) return -1;

h5 = PyObject_Hash(co->co_freevars);

if (h5 == -1) return -1;

h6 = PyObject_Hash(co->co_cellvars);

if (h6 == -1) return -1;

h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^

co->co_argcount ^ co->co_nlocals ^ co->co_flags;

if (h == -1) h = -2;

return h;

}

/* XXX code objects need to participate in GC? */

PyTypeObject PyCode_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"code",

sizeof(PyCodeObject),

(destructor)code_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

(cmpfunc)code_compare, /* tp_compare */

(reprfunc)code_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

(hashfunc)code_hash, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

PyObject_GenericGetAttr, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT, /* tp_flags */

code_doc, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

code_richcompare, /* tp_richcompare */

offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

code_memberlist, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

code_new, /* tp_new */

};

/* Use co_lnotab to compute the line number from a bytecode index, addrq. See

lnotab_notes.txt for the details of the lnotab representation.

int

PyCode_Addr2Line(PyCodeObject *co, int addrq)

{

int size = PyString_Size(co->co_lnotab) / 2;

unsigned char *p = (unsigned char*)PyString_AsString(co->co_lnotab);

int line = co->co_firstlineno;

int addr = 0;

while (--size >= 0) {

addr += *p++;

if (addr > addrq)

break;

line += *p++;

}

return line;

}

/* Update *bounds to describe the first and one-past-the-last instructions in

the same line as lasti. Return the number of that line. */

int

_PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)

{

int size, addr, line;

unsigned char* p;

p = (unsigned char*)PyString_AS_STRING(co->co_lnotab);

size = PyString_GET_SIZE(co->co_lnotab) / 2;

addr = 0;

line = co->co_firstlineno;

assert(line > 0);

/* possible optimization: if f->f_lasti == instr_ub

(likely to be a common case) then we already know

instr_lb -- if we stored the matching value of p

somewhere we could skip the first while loop. */

/* See lnotab_notes.txt for the description of

co_lnotab. A point to remember: increments to p

come in (addr, line) pairs. */

bounds->ap_lower = 0;

while (size > 0) {

if (addr + *p > lasti)

break;

addr += *p++;

if (*p)

bounds->ap_lower = addr;

line += *p++;

--size;

}

if (size > 0) {

while (--size >= 0) {

addr += *p++;

if (*p++)

break;

}

bounds->ap_upper = addr;

}

else {

bounds->ap_upper = INT_MAX;

}

return line;

}

cpython/Objects/codeobject.c at 2.7 · python-emscripten/cpython · GitHub

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