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2212 lines (1999 loc) · 66.4 KB
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Copy pathcodeobject.c
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2212 lines (1999 loc) · 66.4 KB
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#include <stdbool.h>
#include "Python.h"
#include "opcode.h"
#include "structmember.h" // PyMemberDef
#include "pycore_code.h" // _PyCodeConstructor
#include "pycore_frame.h" // FRAME_SPECIALS_SIZE
#include "pycore_interp.h" // PyInterpreterState.co_extra_freefuncs
#include "pycore_opcode.h" // _PyOpcode_Deopt
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_tuple.h" // _PyTuple_ITEMS()
#include "clinic/codeobject.c.h"
/******************
* generic helpers
******************/
/* all_name_chars(s): true iff s matches [a-zA-Z0-9_]* */
static int
all_name_chars(PyObject *o)
{
const unsigned char *s, *e;
if (!PyUnicode_IS_ASCII(o))
return 0;
s = PyUnicode_1BYTE_DATA(o);
e = s + PyUnicode_GET_LENGTH(o);
for (; s != e; s++) {
if (!Py_ISALNUM(*s) && *s != '_')
return 0;
}
return 1;
}
static int
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 || !PyUnicode_CheckExact(v)) {
PyErr_SetString(PyExc_SystemError,
"non-string found in code slot");
return -1;
}
PyUnicode_InternInPlace(&_PyTuple_ITEMS(tuple)[i]);
}
return 0;
}
/* Intern selected string constants */
static int
intern_string_constants(PyObject *tuple, int *modified)
{
for (Py_ssize_t i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
PyObject *v = PyTuple_GET_ITEM(tuple, i);
if (PyUnicode_CheckExact(v)) {
if (PyUnicode_READY(v) == -1) {
return -1;
}
if (all_name_chars(v)) {
PyObject *w = v;
PyUnicode_InternInPlace(&v);
if (w != v) {
PyTuple_SET_ITEM(tuple, i, v);
if (modified) {
*modified = 1;
}
}
}
}
else if (PyTuple_CheckExact(v)) {
if (intern_string_constants(v, NULL) < 0) {
return -1;
}
}
else if (PyFrozenSet_CheckExact(v)) {
PyObject *w = v;
PyObject *tmp = PySequence_Tuple(v);
if (tmp == NULL) {
return -1;
}
int tmp_modified = 0;
if (intern_string_constants(tmp, &tmp_modified) < 0) {
Py_DECREF(tmp);
return -1;
}
if (tmp_modified) {
v = PyFrozenSet_New(tmp);
if (v == NULL) {
Py_DECREF(tmp);
return -1;
}
PyTuple_SET_ITEM(tuple, i, v);
Py_DECREF(w);
if (modified) {
*modified = 1;
}
}
Py_DECREF(tmp);
}
}
return 0;
}
/* 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 (PyUnicode_CheckExact(item)) {
Py_INCREF(item);
}
else if (!PyUnicode_Check(item)) {
PyErr_Format(
PyExc_TypeError,
"name tuples must contain only "
"strings, not '%.500s'",
Py_TYPE(item)->tp_name);
Py_DECREF(newtuple);
return NULL;
}
else {
item = _PyUnicode_Copy(item);
if (item == NULL) {
Py_DECREF(newtuple);
return NULL;
}
}
PyTuple_SET_ITEM(newtuple, i, item);
}
return newtuple;
}
/******************
* _PyCode_New()
******************/
// This is also used in compile.c.
void
_Py_set_localsplus_info(int offset, PyObject *name, _PyLocals_Kind kind,
PyObject *names, PyObject *kinds)
{
Py_INCREF(name);
PyTuple_SET_ITEM(names, offset, name);
_PyLocals_SetKind(kinds, offset, kind);
}
static void
get_localsplus_counts(PyObject *names, PyObject *kinds,
int *pnlocals, int *pnplaincellvars, int *pncellvars,
int *pnfreevars)
{
int nlocals = 0;
int nplaincellvars = 0;
int ncellvars = 0;
int nfreevars = 0;
Py_ssize_t nlocalsplus = PyTuple_GET_SIZE(names);
for (int i = 0; i < nlocalsplus; i++) {
_PyLocals_Kind kind = _PyLocals_GetKind(kinds, i);
if (kind & CO_FAST_LOCAL) {
nlocals += 1;
if (kind & CO_FAST_CELL) {
ncellvars += 1;
}
}
else if (kind & CO_FAST_CELL) {
ncellvars += 1;
nplaincellvars += 1;
}
else if (kind & CO_FAST_FREE) {
nfreevars += 1;
}
}
if (pnlocals != NULL) {
*pnlocals = nlocals;
}
if (pnplaincellvars != NULL) {
*pnplaincellvars = nplaincellvars;
}
if (pncellvars != NULL) {
*pncellvars = ncellvars;
}
if (pnfreevars != NULL) {
*pnfreevars = nfreevars;
}
}
static PyObject *
get_localsplus_names(PyCodeObject *co, _PyLocals_Kind kind, int num)
{
PyObject *names = PyTuple_New(num);
if (names == NULL) {
return NULL;
}
int index = 0;
for (int offset = 0; offset < co->co_nlocalsplus; offset++) {
_PyLocals_Kind k = _PyLocals_GetKind(co->co_localspluskinds, offset);
if ((k & kind) == 0) {
continue;
}
assert(index < num);
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, offset);
Py_INCREF(name);
PyTuple_SET_ITEM(names, index, name);
index += 1;
}
assert(index == num);
return names;
}
int
_PyCode_Validate(struct _PyCodeConstructor *con)
{
/* Check argument types */
if (con->argcount < con->posonlyargcount || con->posonlyargcount < 0 ||
con->kwonlyargcount < 0 ||
con->stacksize < 0 || con->flags < 0 ||
con->code == NULL || !PyBytes_Check(con->code) ||
con->consts == NULL || !PyTuple_Check(con->consts) ||
con->names == NULL || !PyTuple_Check(con->names) ||
con->localsplusnames == NULL || !PyTuple_Check(con->localsplusnames) ||
con->localspluskinds == NULL || !PyBytes_Check(con->localspluskinds) ||
PyTuple_GET_SIZE(con->localsplusnames)
!= PyBytes_GET_SIZE(con->localspluskinds) ||
con->name == NULL || !PyUnicode_Check(con->name) ||
con->qualname == NULL || !PyUnicode_Check(con->qualname) ||
con->filename == NULL || !PyUnicode_Check(con->filename) ||
con->linetable == NULL || !PyBytes_Check(con->linetable) ||
con->exceptiontable == NULL || !PyBytes_Check(con->exceptiontable)
) {
PyErr_BadInternalCall();
return -1;
}
/* Make sure that code is indexable with an int, this is
a long running assumption in ceval.c and many parts of
the interpreter. */
if (PyBytes_GET_SIZE(con->code) > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"code: co_code larger than INT_MAX");
return -1;
}
if (PyBytes_GET_SIZE(con->code) % sizeof(_Py_CODEUNIT) != 0 ||
!_Py_IS_ALIGNED(PyBytes_AS_STRING(con->code), sizeof(_Py_CODEUNIT))
) {
PyErr_SetString(PyExc_ValueError, "code: co_code is malformed");
return -1;
}
/* Ensure that the co_varnames has enough names to cover the arg counts.
* Note that totalargs = nlocals - nplainlocals. We check nplainlocals
* here to avoid the possibility of overflow (however remote). */
int nlocals;
get_localsplus_counts(con->localsplusnames, con->localspluskinds,
&nlocals, NULL, NULL, NULL);
int nplainlocals = nlocals -
con->argcount -
con->kwonlyargcount -
((con->flags & CO_VARARGS) != 0) -
((con->flags & CO_VARKEYWORDS) != 0);
if (nplainlocals < 0) {
PyErr_SetString(PyExc_ValueError, "code: co_varnames is too small");
return -1;
}
return 0;
}
static void
init_code(PyCodeObject *co, struct _PyCodeConstructor *con)
{
int nlocalsplus = (int)PyTuple_GET_SIZE(con->localsplusnames);
int nlocals, nplaincellvars, ncellvars, nfreevars;
get_localsplus_counts(con->localsplusnames, con->localspluskinds,
&nlocals, &nplaincellvars, &ncellvars, &nfreevars);
Py_INCREF(con->filename);
co->co_filename = con->filename;
Py_INCREF(con->name);
co->co_name = con->name;
Py_INCREF(con->qualname);
co->co_qualname = con->qualname;
co->co_flags = con->flags;
co->co_firstlineno = con->firstlineno;
Py_INCREF(con->linetable);
co->co_linetable = con->linetable;
Py_INCREF(con->consts);
co->co_consts = con->consts;
Py_INCREF(con->names);
co->co_names = con->names;
Py_INCREF(con->localsplusnames);
co->co_localsplusnames = con->localsplusnames;
Py_INCREF(con->localspluskinds);
co->co_localspluskinds = con->localspluskinds;
co->co_argcount = con->argcount;
co->co_posonlyargcount = con->posonlyargcount;
co->co_kwonlyargcount = con->kwonlyargcount;
co->co_stacksize = con->stacksize;
Py_INCREF(con->exceptiontable);
co->co_exceptiontable = con->exceptiontable;
/* derived values */
co->co_nlocalsplus = nlocalsplus;
co->co_nlocals = nlocals;
co->co_framesize = nlocalsplus + con->stacksize + FRAME_SPECIALS_SIZE;
co->co_nplaincellvars = nplaincellvars;
co->co_ncellvars = ncellvars;
co->co_nfreevars = nfreevars;
/* not set */
co->co_weakreflist = NULL;
co->co_extra = NULL;
co->_co_code = NULL;
co->co_warmup = QUICKENING_INITIAL_WARMUP_VALUE;
co->_co_linearray_entry_size = 0;
co->_co_linearray = NULL;
memcpy(_PyCode_CODE(co), PyBytes_AS_STRING(con->code),
PyBytes_GET_SIZE(con->code));
int entry_point = 0;
while (entry_point < Py_SIZE(co) &&
_Py_OPCODE(_PyCode_CODE(co)[entry_point]) != RESUME) {
entry_point++;
}
co->_co_firsttraceable = entry_point;
}
static int
scan_varint(const uint8_t *ptr)
{
unsigned int read = *ptr++;
unsigned int val = read & 63;
unsigned int shift = 0;
while (read & 64) {
read = *ptr++;
shift += 6;
val |= (read & 63) << shift;
}
return val;
}
static int
scan_signed_varint(const uint8_t *ptr)
{
unsigned int uval = scan_varint(ptr);
if (uval & 1) {
return -(int)(uval >> 1);
}
else {
return uval >> 1;
}
}
static int
get_line_delta(const uint8_t *ptr)
{
int code = ((*ptr) >> 3) & 15;
switch (code) {
case PY_CODE_LOCATION_INFO_NONE:
return 0;
case PY_CODE_LOCATION_INFO_NO_COLUMNS:
case PY_CODE_LOCATION_INFO_LONG:
return scan_signed_varint(ptr+1);
case PY_CODE_LOCATION_INFO_ONE_LINE0:
return 0;
case PY_CODE_LOCATION_INFO_ONE_LINE1:
return 1;
case PY_CODE_LOCATION_INFO_ONE_LINE2:
return 2;
default:
/* Same line */
return 0;
}
}
static PyObject *
remove_column_info(PyObject *locations)
{
int offset = 0;
const uint8_t *data = (const uint8_t *)PyBytes_AS_STRING(locations);
PyObject *res = PyBytes_FromStringAndSize(NULL, 32);
if (res == NULL) {
PyErr_NoMemory();
return NULL;
}
uint8_t *output = (uint8_t *)PyBytes_AS_STRING(res);
while (offset < PyBytes_GET_SIZE(locations)) {
Py_ssize_t write_offset = output - (uint8_t *)PyBytes_AS_STRING(res);
if (write_offset + 16 >= PyBytes_GET_SIZE(res)) {
if (_PyBytes_Resize(&res, PyBytes_GET_SIZE(res) * 2) < 0) {
return NULL;
}
output = (uint8_t *)PyBytes_AS_STRING(res) + write_offset;
}
int code = (data[offset] >> 3) & 15;
if (code == PY_CODE_LOCATION_INFO_NONE) {
*output++ = data[offset];
}
else {
int blength = (data[offset] & 7)+1;
output += write_location_entry_start(
output, PY_CODE_LOCATION_INFO_NO_COLUMNS, blength);
int ldelta = get_line_delta(&data[offset]);
output += write_signed_varint(output, ldelta);
}
offset++;
while (offset < PyBytes_GET_SIZE(locations) &&
(data[offset] & 128) == 0) {
offset++;
}
}
Py_ssize_t write_offset = output - (uint8_t *)PyBytes_AS_STRING(res);
if (_PyBytes_Resize(&res, write_offset)) {
return NULL;
}
return res;
}
/* The caller is responsible for ensuring that the given data is valid. */
PyCodeObject *
_PyCode_New(struct _PyCodeConstructor *con)
{
/* Ensure that strings are ready Unicode string */
if (PyUnicode_READY(con->name) < 0) {
return NULL;
}
if (PyUnicode_READY(con->qualname) < 0) {
return NULL;
}
if (PyUnicode_READY(con->filename) < 0) {
return NULL;
}
if (intern_strings(con->names) < 0) {
return NULL;
}
if (intern_string_constants(con->consts, NULL) < 0) {
return NULL;
}
if (intern_strings(con->localsplusnames) < 0) {
return NULL;
}
PyObject *replacement_locations = NULL;
// Compact the linetable if we are opted out of debug
// ranges.
if (!_Py_GetConfig()->code_debug_ranges) {
replacement_locations = remove_column_info(con->linetable);
if (replacement_locations == NULL) {
return NULL;
}
con->linetable = replacement_locations;
}
Py_ssize_t size = PyBytes_GET_SIZE(con->code) / sizeof(_Py_CODEUNIT);
PyCodeObject *co = PyObject_NewVar(PyCodeObject, &PyCode_Type, size);
if (co == NULL) {
Py_XDECREF(replacement_locations);
PyErr_NoMemory();
return NULL;
}
init_code(co, con);
Py_XDECREF(replacement_locations);
return co;
}
/******************
* the legacy "constructors"
******************/
PyCodeObject *
PyCode_NewWithPosOnlyArgs(int argcount, int posonlyargcount, int kwonlyargcount,
int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *freevars, PyObject *cellvars,
PyObject *filename, PyObject *name,
PyObject *qualname, int firstlineno,
PyObject *linetable,
PyObject *exceptiontable)
{
PyCodeObject *co = NULL;
PyObject *localsplusnames = NULL;
PyObject *localspluskinds = NULL;
if (varnames == NULL || !PyTuple_Check(varnames) ||
cellvars == NULL || !PyTuple_Check(cellvars) ||
freevars == NULL || !PyTuple_Check(freevars)
) {
PyErr_BadInternalCall();
return NULL;
}
// Set the "fast locals plus" info.
int nvarnames = (int)PyTuple_GET_SIZE(varnames);
int ncellvars = (int)PyTuple_GET_SIZE(cellvars);
int nfreevars = (int)PyTuple_GET_SIZE(freevars);
int nlocalsplus = nvarnames + ncellvars + nfreevars;
localsplusnames = PyTuple_New(nlocalsplus);
if (localsplusnames == NULL) {
goto error;
}
localspluskinds = PyBytes_FromStringAndSize(NULL, nlocalsplus);
if (localspluskinds == NULL) {
goto error;
}
int offset = 0;
for (int i = 0; i < nvarnames; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(varnames, i);
_Py_set_localsplus_info(offset, name, CO_FAST_LOCAL,
localsplusnames, localspluskinds);
}
for (int i = 0; i < ncellvars; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(cellvars, i);
int argoffset = -1;
for (int j = 0; j < nvarnames; j++) {
int cmp = PyUnicode_Compare(PyTuple_GET_ITEM(varnames, j),
name);
assert(!PyErr_Occurred());
if (cmp == 0) {
argoffset = j;
break;
}
}
if (argoffset >= 0) {
// Merge the localsplus indices.
nlocalsplus -= 1;
offset -= 1;
_PyLocals_Kind kind = _PyLocals_GetKind(localspluskinds, argoffset);
_PyLocals_SetKind(localspluskinds, argoffset, kind | CO_FAST_CELL);
continue;
}
_Py_set_localsplus_info(offset, name, CO_FAST_CELL,
localsplusnames, localspluskinds);
}
for (int i = 0; i < nfreevars; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(freevars, i);
_Py_set_localsplus_info(offset, name, CO_FAST_FREE,
localsplusnames, localspluskinds);
}
// If any cells were args then nlocalsplus will have shrunk.
if (nlocalsplus != PyTuple_GET_SIZE(localsplusnames)) {
if (_PyTuple_Resize(&localsplusnames, nlocalsplus) < 0
|| _PyBytes_Resize(&localspluskinds, nlocalsplus) < 0) {
goto error;
}
}
struct _PyCodeConstructor con = {
.filename = filename,
.name = name,
.qualname = qualname,
.flags = flags,
.code = code,
.firstlineno = firstlineno,
.linetable = linetable,
.consts = consts,
.names = names,
.localsplusnames = localsplusnames,
.localspluskinds = localspluskinds,
.argcount = argcount,
.posonlyargcount = posonlyargcount,
.kwonlyargcount = kwonlyargcount,
.stacksize = stacksize,
.exceptiontable = exceptiontable,
};
if (_PyCode_Validate(&con) < 0) {
goto error;
}
assert(PyBytes_GET_SIZE(code) % sizeof(_Py_CODEUNIT) == 0);
assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(code), sizeof(_Py_CODEUNIT)));
if (nlocals != PyTuple_GET_SIZE(varnames)) {
PyErr_SetString(PyExc_ValueError,
"code: co_nlocals != len(co_varnames)");
goto error;
}
co = _PyCode_New(&con);
if (co == NULL) {
goto error;
}
error:
Py_XDECREF(localsplusnames);
Py_XDECREF(localspluskinds);
return co;
}
PyCodeObject *
PyCode_New(int argcount, int kwonlyargcount,
int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *freevars, PyObject *cellvars,
PyObject *filename, PyObject *name, PyObject *qualname,
int firstlineno,
PyObject *linetable,
PyObject *exceptiontable)
{
return PyCode_NewWithPosOnlyArgs(argcount, 0, kwonlyargcount, nlocals,
stacksize, flags, code, consts, names,
varnames, freevars, cellvars, filename,
name, qualname, firstlineno,
linetable,
exceptiontable);
}
// NOTE: When modifying the construction of PyCode_NewEmpty, please also change
// test.test_code.CodeLocationTest.test_code_new_empty to keep it in sync!
static const uint8_t assert0[6] = {
RESUME, 0,
LOAD_ASSERTION_ERROR, 0,
RAISE_VARARGS, 1
};
static const uint8_t linetable[2] = {
(1 << 7) // New entry.
| (PY_CODE_LOCATION_INFO_NO_COLUMNS << 3)
| (3 - 1), // Three code units.
0, // Offset from co_firstlineno.
};
PyCodeObject *
PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
{
PyObject *nulltuple = NULL;
PyObject *filename_ob = NULL;
PyObject *funcname_ob = NULL;
PyObject *code_ob = NULL;
PyObject *linetable_ob = NULL;
PyCodeObject *result = NULL;
nulltuple = PyTuple_New(0);
if (nulltuple == NULL) {
goto failed;
}
funcname_ob = PyUnicode_FromString(funcname);
if (funcname_ob == NULL) {
goto failed;
}
filename_ob = PyUnicode_DecodeFSDefault(filename);
if (filename_ob == NULL) {
goto failed;
}
code_ob = PyBytes_FromStringAndSize((const char *)assert0, 6);
if (code_ob == NULL) {
goto failed;
}
linetable_ob = PyBytes_FromStringAndSize((const char *)linetable, 2);
if (linetable_ob == NULL) {
goto failed;
}
#define emptystring (PyObject *)&_Py_SINGLETON(bytes_empty)
struct _PyCodeConstructor con = {
.filename = filename_ob,
.name = funcname_ob,
.qualname = funcname_ob,
.code = code_ob,
.firstlineno = firstlineno,
.linetable = linetable_ob,
.consts = nulltuple,
.names = nulltuple,
.localsplusnames = nulltuple,
.localspluskinds = emptystring,
.exceptiontable = emptystring,
.stacksize = 1,
};
result = _PyCode_New(&con);
failed:
Py_XDECREF(nulltuple);
Py_XDECREF(funcname_ob);
Py_XDECREF(filename_ob);
Py_XDECREF(code_ob);
Py_XDECREF(linetable_ob);
return result;
}
/******************
* source location tracking (co_lines/co_positions)
******************/
/* Use co_linetable to compute the line number from a bytecode index, addrq. See
lnotab_notes.txt for the details of the lnotab representation.
*/
int
_PyCode_CreateLineArray(PyCodeObject *co)
{
assert(co->_co_linearray == NULL);
PyCodeAddressRange bounds;
int size;
int max_line = 0;
_PyCode_InitAddressRange(co, &bounds);
while(_PyLineTable_NextAddressRange(&bounds)) {
if (bounds.ar_line > max_line) {
max_line = bounds.ar_line;
}
}
if (max_line < (1 << 15)) {
size = 2;
}
else {
size = 4;
}
co->_co_linearray = PyMem_Malloc(Py_SIZE(co)*size);
if (co->_co_linearray == NULL) {
PyErr_NoMemory();
return -1;
}
co->_co_linearray_entry_size = size;
_PyCode_InitAddressRange(co, &bounds);
while(_PyLineTable_NextAddressRange(&bounds)) {
int start = bounds.ar_start / sizeof(_Py_CODEUNIT);
int end = bounds.ar_end / sizeof(_Py_CODEUNIT);
for (int index = start; index < end; index++) {
assert(index < (int)Py_SIZE(co));
if (size == 2) {
assert(((int16_t)bounds.ar_line) == bounds.ar_line);
((int16_t *)co->_co_linearray)[index] = bounds.ar_line;
}
else {
assert(size == 4);
((int32_t *)co->_co_linearray)[index] = bounds.ar_line;
}
}
}
return 0;
}
int
PyCode_Addr2Line(PyCodeObject *co, int addrq)
{
if (addrq < 0) {
return co->co_firstlineno;
}
assert(addrq >= 0 && addrq < _PyCode_NBYTES(co));
if (co->_co_linearray) {
return _PyCode_LineNumberFromArray(co, addrq / sizeof(_Py_CODEUNIT));
}
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(co, &bounds);
return _PyCode_CheckLineNumber(addrq, &bounds);
}
void
_PyLineTable_InitAddressRange(const char *linetable, Py_ssize_t length, int firstlineno, PyCodeAddressRange *range)
{
range->opaque.lo_next = (const uint8_t *)linetable;
range->opaque.limit = range->opaque.lo_next + length;
range->ar_start = -1;
range->ar_end = 0;
range->opaque.computed_line = firstlineno;
range->ar_line = -1;
}
int
_PyCode_InitAddressRange(PyCodeObject* co, PyCodeAddressRange *bounds)
{
assert(co->co_linetable != NULL);
const char *linetable = PyBytes_AS_STRING(co->co_linetable);
Py_ssize_t length = PyBytes_GET_SIZE(co->co_linetable);
_PyLineTable_InitAddressRange(linetable, length, co->co_firstlineno, bounds);
return bounds->ar_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, or -1 if lasti is out of bounds. */
int
_PyCode_CheckLineNumber(int lasti, PyCodeAddressRange *bounds)
{
while (bounds->ar_end <= lasti) {
if (!_PyLineTable_NextAddressRange(bounds)) {
return -1;
}
}
while (bounds->ar_start > lasti) {
if (!_PyLineTable_PreviousAddressRange(bounds)) {
return -1;
}
}
return bounds->ar_line;
}
static int
is_no_line_marker(uint8_t b)
{
return (b >> 3) == 0x1f;
}
#define ASSERT_VALID_BOUNDS(bounds) \
assert(bounds->opaque.lo_next <= bounds->opaque.limit && \
(bounds->ar_line == -1 || bounds->ar_line == bounds->opaque.computed_line) && \
(bounds->opaque.lo_next == bounds->opaque.limit || \
(*bounds->opaque.lo_next) & 128))
static int
next_code_delta(PyCodeAddressRange *bounds)
{
assert((*bounds->opaque.lo_next) & 128);
return (((*bounds->opaque.lo_next) & 7) + 1) * sizeof(_Py_CODEUNIT);
}
static int
previous_code_delta(PyCodeAddressRange *bounds)
{
if (bounds->ar_start == 0) {
// If we looking at the first entry, the
// "previous" entry has an implicit length of 1.
return 1;
}
const uint8_t *ptr = bounds->opaque.lo_next-1;
while (((*ptr) & 128) == 0) {
ptr--;
}
return (((*ptr) & 7) + 1) * sizeof(_Py_CODEUNIT);
}
static int
read_byte(PyCodeAddressRange *bounds)
{
return *bounds->opaque.lo_next++;
}
static int
read_varint(PyCodeAddressRange *bounds)
{
unsigned int read = read_byte(bounds);
unsigned int val = read & 63;
unsigned int shift = 0;
while (read & 64) {
read = read_byte(bounds);
shift += 6;
val |= (read & 63) << shift;
}
return val;
}
static int
read_signed_varint(PyCodeAddressRange *bounds)
{
unsigned int uval = read_varint(bounds);
if (uval & 1) {
return -(int)(uval >> 1);
}
else {
return uval >> 1;
}
}
static void
retreat(PyCodeAddressRange *bounds)
{
ASSERT_VALID_BOUNDS(bounds);
assert(bounds->ar_start >= 0);
do {
bounds->opaque.lo_next--;
} while (((*bounds->opaque.lo_next) & 128) == 0);
bounds->opaque.computed_line -= get_line_delta(bounds->opaque.lo_next);
bounds->ar_end = bounds->ar_start;
bounds->ar_start -= previous_code_delta(bounds);
if (is_no_line_marker(bounds->opaque.lo_next[-1])) {
bounds->ar_line = -1;
}
else {
bounds->ar_line = bounds->opaque.computed_line;
}
ASSERT_VALID_BOUNDS(bounds);
}
static void
advance(PyCodeAddressRange *bounds)
{
ASSERT_VALID_BOUNDS(bounds);
bounds->opaque.computed_line += get_line_delta(bounds->opaque.lo_next);
if (is_no_line_marker(*bounds->opaque.lo_next)) {
bounds->ar_line = -1;
}
else {
bounds->ar_line = bounds->opaque.computed_line;
}
bounds->ar_start = bounds->ar_end;
bounds->ar_end += next_code_delta(bounds);
do {
bounds->opaque.lo_next++;
} while (bounds->opaque.lo_next < bounds->opaque.limit &&
((*bounds->opaque.lo_next) & 128) == 0);
ASSERT_VALID_BOUNDS(bounds);
}
static void
advance_with_locations(PyCodeAddressRange *bounds, int *endline, int *column, int *endcolumn)
{
ASSERT_VALID_BOUNDS(bounds);
int first_byte = read_byte(bounds);
int code = (first_byte >> 3) & 15;
bounds->ar_start = bounds->ar_end;
bounds->ar_end = bounds->ar_start + ((first_byte & 7) + 1) * sizeof(_Py_CODEUNIT);
switch(code) {
case PY_CODE_LOCATION_INFO_NONE:
bounds->ar_line = *endline = -1;
*column = *endcolumn = -1;
break;
case PY_CODE_LOCATION_INFO_LONG:
{
bounds->opaque.computed_line += read_signed_varint(bounds);
bounds->ar_line = bounds->opaque.computed_line;
*endline = bounds->ar_line + read_varint(bounds);
*column = read_varint(bounds)-1;
*endcolumn = read_varint(bounds)-1;
break;
}
case PY_CODE_LOCATION_INFO_NO_COLUMNS:
{
/* No column */
bounds->opaque.computed_line += read_signed_varint(bounds);
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = *endcolumn = -1;
break;
}
case PY_CODE_LOCATION_INFO_ONE_LINE0:
case PY_CODE_LOCATION_INFO_ONE_LINE1:
case PY_CODE_LOCATION_INFO_ONE_LINE2:
{
/* one line form */
int line_delta = code - 10;
bounds->opaque.computed_line += line_delta;
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = read_byte(bounds);
*endcolumn = read_byte(bounds);
break;
}
default:
{
/* Short forms */
int second_byte = read_byte(bounds);
assert((second_byte & 128) == 0);
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = code << 3 | (second_byte >> 4);
*endcolumn = *column + (second_byte & 15);
}
}
ASSERT_VALID_BOUNDS(bounds);
}
int
PyCode_Addr2Location(PyCodeObject *co, int addrq,
int *start_line, int *start_column,
int *end_line, int *end_column)
{
if (addrq < 0) {
*start_line = *end_line = co->co_firstlineno;
*start_column = *end_column = 0;
return 1;
}
assert(addrq >= 0 && addrq < _PyCode_NBYTES(co));
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(co, &bounds);
_PyCode_CheckLineNumber(addrq, &bounds);
retreat(&bounds);
advance_with_locations(&bounds, end_line, start_column, end_column);
*start_line = bounds.ar_line;
return 1;
}