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compile.c
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/***********************************************************
Copyright (c) 2000, BeOpen.com.
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
All rights reserved.
See the file "Misc/COPYRIGHT" for information on usage and
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
******************************************************************/
/* Compile an expression node to intermediate code */
/* XXX TO DO:
XXX add __doc__ attribute == co_doc to code object attributes?
XXX (it's currently the first item of the co_const tuple)
XXX Generate simple jump for break/return outside 'try...finally'
XXX Allow 'continue' inside try-finally
XXX New opcode for loading the initial index for a for loop
XXX other JAR tricks?
*/
#ifndef NO_PRIVATE_NAME_MANGLING
#define PRIVATE_NAME_MANGLING
#endif
#include "Python.h"
#include "node.h"
#include "token.h"
#include "graminit.h"
#include "compile.h"
#include "opcode.h"
#include "structmember.h"
#include <ctype.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
/* Three symbols from graminit.h are also defined in Python.h, with
Py_ prefixes to their names. Python.h can't include graminit.h
(which defines too many confusing symbols), but we can check here
that they haven't changed (which is very unlikely, but possible). */
#if Py_single_input != single_input
#error "single_input has changed -- update Py_single_input in Python.h"
#endif
#if Py_file_input != file_input
#error "file_input has changed -- update Py_file_input in Python.h"
#endif
#if Py_eval_input != eval_input
#error "eval_input has changed -- update Py_eval_input in Python.h"
#endif
int Py_OptimizeFlag = 0;
#define OP_DELETE 0
#define OP_ASSIGN 1
#define OP_APPLY 2
#define OFF(x) offsetof(PyCodeObject, x)
static struct memberlist 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_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 */
};
static PyObject *
code_getattr(PyCodeObject *co, char *name)
{
return PyMember_Get((char *)co, code_memberlist, name);
}
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_filename);
Py_XDECREF(co->co_name);
Py_XDECREF(co->co_lnotab);
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_AsString(co->co_filename);
if (co->co_name && PyString_Check(co->co_name))
name = PyString_AsString(co->co_name);
sprintf(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) return cmp;
cmp = co->co_nlocals - cp->co_nlocals;
if (cmp) return cmp;
cmp = co->co_flags - cp->co_flags;
if (cmp) return cmp;
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);
return cmp;
}
static long
code_hash(PyCodeObject *co)
{
long h, h0, h1, h2, h3, h4;
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;
h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^
co->co_argcount ^ co->co_nlocals ^ co->co_flags;
if (h == -1) h = -2;
return h;
}
PyTypeObject PyCode_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"code",
sizeof(PyCodeObject),
0,
(destructor)code_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)code_getattr, /*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*/
};
#define NAME_CHARS \
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
PyCodeObject *
PyCode_New(int argcount, int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *filename, PyObject *name,
int firstlineno, PyObject *lnotab)
{
PyCodeObject *co;
int i;
PyBufferProcs *pb;
/* 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) ||
name == NULL || !PyString_Check(name) ||
filename == NULL || !PyString_Check(filename) ||
lnotab == NULL || !PyString_Check(lnotab)) {
PyErr_BadInternalCall();
return NULL;
}
pb = code->ob_type->tp_as_buffer;
if (pb == NULL ||
pb->bf_getreadbuffer == NULL ||
pb->bf_getsegcount == NULL ||
(*pb->bf_getsegcount)(code, NULL) != 1)
{
PyErr_BadInternalCall();
return NULL;
}
/* Make sure names and varnames are all strings, & intern them */
for (i = PyTuple_Size(names); --i >= 0; ) {
PyObject *v = PyTuple_GetItem(names, i);
if (v == NULL || !PyString_Check(v)) {
PyErr_BadInternalCall();
return NULL;
}
PyString_InternInPlace(&PyTuple_GET_ITEM(names, i));
}
for (i = PyTuple_Size(varnames); --i >= 0; ) {
PyObject *v = PyTuple_GetItem(varnames, i);
if (v == NULL || !PyString_Check(v)) {
PyErr_BadInternalCall();
return NULL;
}
PyString_InternInPlace(&PyTuple_GET_ITEM(varnames, i));
}
/* Intern selected string constants */
for (i = PyTuple_Size(consts); --i >= 0; ) {
PyObject *v = PyTuple_GetItem(consts, i);
char *p;
if (!PyString_Check(v))
continue;
p = PyString_AsString(v);
if (strspn(p, NAME_CHARS)
!= (size_t)PyString_Size(v))
continue;
PyString_InternInPlace(&PyTuple_GET_ITEM(consts, i));
}
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(filename);
co->co_filename = filename;
Py_INCREF(name);
co->co_name = name;
co->co_firstlineno = firstlineno;
Py_INCREF(lnotab);
co->co_lnotab = lnotab;
}
return co;
}
/* Data structure used internally */
struct compiling {
PyObject *c_code; /* string */
PyObject *c_consts; /* list of objects */
PyObject *c_const_dict; /* inverse of c_consts */
PyObject *c_names; /* list of strings (names) */
PyObject *c_name_dict; /* inverse of c_names */
PyObject *c_globals; /* dictionary (value=None) */
PyObject *c_locals; /* dictionary (value=localID) */
PyObject *c_varnames; /* list (inverse of c_locals) */
int c_nlocals; /* index of next local */
int c_argcount; /* number of top-level arguments */
int c_flags; /* same as co_flags */
int c_nexti; /* index into c_code */
int c_errors; /* counts errors occurred */
int c_infunction; /* set when compiling a function */
int c_interactive; /* generating code for interactive command */
int c_loops; /* counts nested loops */
int c_begin; /* begin of current loop, for 'continue' */
int c_block[CO_MAXBLOCKS]; /* stack of block types */
int c_nblocks; /* current block stack level */
char *c_filename; /* filename of current node */
char *c_name; /* name of object (e.g. function) */
int c_lineno; /* Current line number */
int c_stacklevel; /* Current stack level */
int c_maxstacklevel; /* Maximum stack level */
int c_firstlineno;
PyObject *c_lnotab; /* Table mapping address to line number */
int c_last_addr, c_last_line, c_lnotab_next;
#ifdef PRIVATE_NAME_MANGLING
char *c_private; /* for private name mangling */
#endif
};
/* Error message including line number */
static void
com_error(struct compiling *c, PyObject *exc, char *msg)
{
size_t n = strlen(msg);
PyObject *v;
char buffer[30];
char *s;
c->c_errors++;
if (c->c_lineno <= 1) {
/* Unknown line number or single interactive command */
PyErr_SetString(exc, msg);
return;
}
sprintf(buffer, " (line %d)", c->c_lineno);
v = PyString_FromStringAndSize((char *)NULL, n + strlen(buffer));
if (v == NULL)
return; /* MemoryError, too bad */
s = PyString_AS_STRING((PyStringObject *)v);
strcpy(s, msg);
strcat(s, buffer);
PyErr_SetObject(exc, v);
Py_DECREF(v);
}
/* Interface to the block stack */
static void
block_push(struct compiling *c, int type)
{
if (c->c_nblocks >= CO_MAXBLOCKS) {
com_error(c, PyExc_SystemError,
"too many statically nested blocks");
}
else {
c->c_block[c->c_nblocks++] = type;
}
}
static void
block_pop(struct compiling *c, int type)
{
if (c->c_nblocks > 0)
c->c_nblocks--;
if (c->c_block[c->c_nblocks] != type && c->c_errors == 0) {
com_error(c, PyExc_SystemError, "bad block pop");
}
}
/* Prototype forward declarations */
static int com_init(struct compiling *, char *);
static void com_free(struct compiling *);
static void com_push(struct compiling *, int);
static void com_pop(struct compiling *, int);
static void com_done(struct compiling *);
static void com_node(struct compiling *, struct _node *);
static void com_factor(struct compiling *, struct _node *);
static void com_addbyte(struct compiling *, int);
static void com_addint(struct compiling *, int);
static void com_addoparg(struct compiling *, int, int);
static void com_addfwref(struct compiling *, int, int *);
static void com_backpatch(struct compiling *, int);
static int com_add(struct compiling *, PyObject *, PyObject *, PyObject *);
static int com_addconst(struct compiling *, PyObject *);
static int com_addname(struct compiling *, PyObject *);
static void com_addopname(struct compiling *, int, node *);
static void com_list(struct compiling *, node *, int);
static int com_argdefs(struct compiling *, node *);
static int com_newlocal(struct compiling *, char *);
static PyCodeObject *icompile(struct _node *, struct compiling *);
static PyCodeObject *jcompile(struct _node *, char *,
struct compiling *);
static PyObject *parsestrplus(node *);
static PyObject *parsestr(char *);
static int
com_init(struct compiling *c, char *filename)
{
memset((void *)c, '\0', sizeof(struct compiling));
if ((c->c_code = PyString_FromStringAndSize((char *)NULL,
1000)) == NULL)
goto fail;
if ((c->c_consts = PyList_New(0)) == NULL)
goto fail;
if ((c->c_const_dict = PyDict_New()) == NULL)
goto fail;
if ((c->c_names = PyList_New(0)) == NULL)
goto fail;
if ((c->c_name_dict = PyDict_New()) == NULL)
goto fail;
if ((c->c_globals = PyDict_New()) == NULL)
goto fail;
if ((c->c_locals = PyDict_New()) == NULL)
goto fail;
if ((c->c_varnames = PyList_New(0)) == NULL)
goto fail;
if ((c->c_lnotab = PyString_FromStringAndSize((char *)NULL,
1000)) == NULL)
goto fail;
c->c_nlocals = 0;
c->c_argcount = 0;
c->c_flags = 0;
c->c_nexti = 0;
c->c_errors = 0;
c->c_infunction = 0;
c->c_interactive = 0;
c->c_loops = 0;
c->c_begin = 0;
c->c_nblocks = 0;
c->c_filename = filename;
c->c_name = "?";
c->c_lineno = 0;
c->c_stacklevel = 0;
c->c_maxstacklevel = 0;
c->c_firstlineno = 0;
c->c_last_addr = 0;
c->c_last_line = 0;
c-> c_lnotab_next = 0;
return 1;
fail:
com_free(c);
return 0;
}
static void
com_free(struct compiling *c)
{
Py_XDECREF(c->c_code);
Py_XDECREF(c->c_consts);
Py_XDECREF(c->c_const_dict);
Py_XDECREF(c->c_names);
Py_XDECREF(c->c_name_dict);
Py_XDECREF(c->c_globals);
Py_XDECREF(c->c_locals);
Py_XDECREF(c->c_varnames);
Py_XDECREF(c->c_lnotab);
}
static void
com_push(struct compiling *c, int n)
{
c->c_stacklevel += n;
if (c->c_stacklevel > c->c_maxstacklevel)
c->c_maxstacklevel = c->c_stacklevel;
}
static void
com_pop(struct compiling *c, int n)
{
if (c->c_stacklevel < n) {
/* fprintf(stderr,
"%s:%d: underflow! nexti=%d, level=%d, n=%d\n",
c->c_filename, c->c_lineno,
c->c_nexti, c->c_stacklevel, n); */
c->c_stacklevel = 0;
}
else
c->c_stacklevel -= n;
}
static void
com_done(struct compiling *c)
{
if (c->c_code != NULL)
_PyString_Resize(&c->c_code, c->c_nexti);
if (c->c_lnotab != NULL)
_PyString_Resize(&c->c_lnotab, c->c_lnotab_next);
}
static void
com_addbyte(struct compiling *c, int byte)
{
int len;
/*fprintf(stderr, "%3d: %3d\n", c->c_nexti, byte);*/
if (byte < 0 || byte > 255) {
/*
fprintf(stderr, "XXX compiling bad byte: %d\n", byte);
fatal("com_addbyte: byte out of range");
*/
com_error(c, PyExc_SystemError,
"com_addbyte: byte out of range");
}
if (c->c_code == NULL)
return;
len = PyString_Size(c->c_code);
if (c->c_nexti >= len) {
if (_PyString_Resize(&c->c_code, len+1000) != 0) {
c->c_errors++;
return;
}
}
PyString_AsString(c->c_code)[c->c_nexti++] = byte;
}
static void
com_addint(struct compiling *c, int x)
{
com_addbyte(c, x & 0xff);
com_addbyte(c, x >> 8); /* XXX x should be positive */
}
static void
com_add_lnotab(struct compiling *c, int addr, int line)
{
int size;
char *p;
if (c->c_lnotab == NULL)
return;
size = PyString_Size(c->c_lnotab);
if (c->c_lnotab_next+2 > size) {
if (_PyString_Resize(&c->c_lnotab, size + 1000) < 0) {
c->c_errors++;
return;
}
}
p = PyString_AsString(c->c_lnotab) + c->c_lnotab_next;
*p++ = addr;
*p++ = line;
c->c_lnotab_next += 2;
}
static void
com_set_lineno(struct compiling *c, int lineno)
{
c->c_lineno = lineno;
if (c->c_firstlineno == 0) {
c->c_firstlineno = c->c_last_line = lineno;
}
else {
int incr_addr = c->c_nexti - c->c_last_addr;
int incr_line = lineno - c->c_last_line;
while (incr_addr > 0 || incr_line > 0) {
int trunc_addr = incr_addr;
int trunc_line = incr_line;
if (trunc_addr > 255)
trunc_addr = 255;
if (trunc_line > 255)
trunc_line = 255;
com_add_lnotab(c, trunc_addr, trunc_line);
incr_addr -= trunc_addr;
incr_line -= trunc_line;
}
c->c_last_addr = c->c_nexti;
c->c_last_line = lineno;
}
}
static void
com_addoparg(struct compiling *c, int op, int arg)
{
if (op == SET_LINENO) {
com_set_lineno(c, arg);
if (Py_OptimizeFlag)
return;
}
com_addbyte(c, op);
com_addint(c, arg);
}
static void
com_addfwref(struct compiling *c, int op, int *p_anchor)
{
/* Compile a forward reference for backpatching */
int here;
int anchor;
com_addbyte(c, op);
here = c->c_nexti;
anchor = *p_anchor;
*p_anchor = here;
com_addint(c, anchor == 0 ? 0 : here - anchor);
}
static void
com_backpatch(struct compiling *c, int anchor)
{
unsigned char *code = (unsigned char *) PyString_AsString(c->c_code);
int target = c->c_nexti;
int dist;
int prev;
for (;;) {
/* Make the JUMP instruction at anchor point to target */
prev = code[anchor] + (code[anchor+1] << 8);
dist = target - (anchor+2);
code[anchor] = dist & 0xff;
code[anchor+1] = dist >> 8;
if (!prev)
break;
anchor -= prev;
}
}
/* Handle literals and names uniformly */
static int
com_add(struct compiling *c, PyObject *list, PyObject *dict, PyObject *v)
{
PyObject *w, *t, *np=NULL;
long n;
t = Py_BuildValue("(OO)", v, v->ob_type);
if (t == NULL)
goto fail;
w = PyDict_GetItem(dict, t);
if (w != NULL) {
n = PyInt_AsLong(w);
} else {
n = PyList_Size(list);
np = PyInt_FromLong(n);
if (np == NULL)
goto fail;
if (PyList_Append(list, v) != 0)
goto fail;
if (PyDict_SetItem(dict, t, np) != 0)
goto fail;
Py_DECREF(np);
}
Py_DECREF(t);
return n;
fail:
Py_XDECREF(np);
Py_XDECREF(t);
c->c_errors++;
return 0;
}
static int
com_addconst(struct compiling *c, PyObject *v)
{
return com_add(c, c->c_consts, c->c_const_dict, v);
}
static int
com_addname(struct compiling *c, PyObject *v)
{
return com_add(c, c->c_names, c->c_name_dict, v);
}
#ifdef PRIVATE_NAME_MANGLING
static int
com_mangle(struct compiling *c, char *name, char *buffer, size_t maxlen)
{
/* Name mangling: __private becomes _classname__private.
This is independent from how the name is used. */
char *p;
size_t nlen, plen;
nlen = strlen(name);
if (nlen+2 >= maxlen)
return 0; /* Don't mangle __extremely_long_names */
if (name[nlen-1] == '_' && name[nlen-2] == '_')
return 0; /* Don't mangle __whatever__ */
p = c->c_private;
/* Strip leading underscores from class name */
while (*p == '_')
p++;
if (*p == '\0')
return 0; /* Don't mangle if class is just underscores */
plen = strlen(p);
if (plen + nlen >= maxlen)
plen = maxlen-nlen-2; /* Truncate class name if too long */
/* buffer = "_" + p[:plen] + name # i.e. 1+plen+nlen bytes */
buffer[0] = '_';
strncpy(buffer+1, p, plen);
strcpy(buffer+1+plen, name);
/* fprintf(stderr, "mangle %s -> %s\n", name, buffer); */
return 1;
}
#endif
static void
com_addopnamestr(struct compiling *c, int op, char *name)
{
PyObject *v;
int i;
#ifdef PRIVATE_NAME_MANGLING
char buffer[256];
if (name != NULL && name[0] == '_' && name[1] == '_' &&
c->c_private != NULL &&
com_mangle(c, name, buffer, sizeof(buffer)))
name = buffer;
#endif
if (name == NULL || (v = PyString_InternFromString(name)) == NULL) {
c->c_errors++;
i = 255;
}
else {
i = com_addname(c, v);
Py_DECREF(v);
}
/* Hack to replace *_NAME opcodes by *_GLOBAL if necessary */
switch (op) {
case LOAD_NAME:
case STORE_NAME:
case DELETE_NAME:
if (PyDict_GetItemString(c->c_globals, name) != NULL) {
switch (op) {
case LOAD_NAME: op = LOAD_GLOBAL; break;
case STORE_NAME: op = STORE_GLOBAL; break;
case DELETE_NAME: op = DELETE_GLOBAL; break;
}
}
}
com_addoparg(c, op, i);
}
static void
com_addopname(struct compiling *c, int op, node *n)
{
char *name;
char buffer[1000];
/* XXX it is possible to write this code without the 1000
chars on the total length of dotted names, I just can't be
bothered right now */
if (TYPE(n) == STAR)
name = "*";
else if (TYPE(n) == dotted_name) {
char *p = buffer;
int i;
name = buffer;
for (i = 0; i < NCH(n); i += 2) {
char *s = STR(CHILD(n, i));
if (p + strlen(s) > buffer + (sizeof buffer) - 2) {
com_error(c, PyExc_MemoryError,
"dotted_name too long");
name = NULL;
break;
}
if (p != buffer)
*p++ = '.';
strcpy(p, s);
p = strchr(p, '\0');
}
}
else {
REQ(n, NAME);
name = STR(n);
}
com_addopnamestr(c, op, name);
}
static PyObject *
parsenumber(struct compiling *co, char *s)
{
extern double atof(const char *);
char *end;
long x;
double dx;
#ifndef WITHOUT_COMPLEX
Py_complex c;
int imflag;
#endif
errno = 0;
end = s + strlen(s) - 1;
#ifndef WITHOUT_COMPLEX
imflag = *end == 'j' || *end == 'J';
#endif
if (*end == 'l' || *end == 'L')
return PyLong_FromString(s, (char **)0, 0);
if (s[0] == '0')
x = (long) PyOS_strtoul(s, &end, 0);
else
x = PyOS_strtol(s, &end, 0);
if (*end == '\0') {
if (errno != 0) {
com_error(co, PyExc_OverflowError,
"integer literal too large");
return NULL;
}
return PyInt_FromLong(x);
}
/* XXX Huge floats may silently fail */
#ifndef WITHOUT_COMPLEX
if (imflag) {
c.real = 0.;
PyFPE_START_PROTECT("atof", return 0)
c.imag = atof(s);
PyFPE_END_PROTECT(c)
return PyComplex_FromCComplex(c);
}
else
#endif
{
PyFPE_START_PROTECT("atof", return 0)
dx = atof(s);
PyFPE_END_PROTECT(dx)
return PyFloat_FromDouble(dx);
}
}
static PyObject *
parsestr(char *s)
{
PyObject *v;
size_t len;
char *buf;
char *p;
char *end;
int c;
int first = *s;
int quote = first;
int rawmode = 0;
int unicode = 0;
if (isalpha(quote) || quote == '_') {
if (quote == 'u' || quote == 'U') {
quote = *++s;
unicode = 1;
}
if (quote == 'r' || quote == 'R') {
quote = *++s;
rawmode = 1;
}
}
if (quote != '\'' && quote != '\"') {
PyErr_BadInternalCall();
return NULL;
}
s++;
len = strlen(s);
if (len > INT_MAX) {
PyErr_SetString(PyExc_OverflowError, "string to parse is too long");
return NULL;
}
if (s[--len] != quote) {
PyErr_BadInternalCall();
return NULL;
}
if (len >= 4 && s[0] == quote && s[1] == quote) {
s += 2;
len -= 2;
if (s[--len] != quote || s[--len] != quote) {
PyErr_BadInternalCall();
return NULL;
}
}
if (unicode || Py_UnicodeFlag) {
if (rawmode)
return PyUnicode_DecodeRawUnicodeEscape(
s, len, NULL);
else
return PyUnicode_DecodeUnicodeEscape(
s, len, NULL);
}
else if (rawmode || strchr(s, '\\') == NULL) {
return PyString_FromStringAndSize(s, len);
}
v = PyString_FromStringAndSize((char *)NULL, len);
p = buf = PyString_AsString(v);
end = s + len;
while (s < end) {
if (*s != '\\') {
*p++ = *s++;
continue;
}
s++;
switch (*s++) {
/* XXX This assumes ASCII! */
case '\n': break;
case '\\': *p++ = '\\'; break;
case '\'': *p++ = '\''; break;
case '\"': *p++ = '\"'; break;
case 'b': *p++ = '\b'; break;
case 'f': *p++ = '\014'; break; /* FF */
case 't': *p++ = '\t'; break;
case 'n': *p++ = '\n'; break;
case 'r': *p++ = '\r'; break;
case 'v': *p++ = '\013'; break; /* VT */
case 'a': *p++ = '\007'; break; /* BEL, not classic C */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c = s[-1] - '0';
if ('0' <= *s && *s <= '7') {
c = (c<<3) + *s++ - '0';
if ('0' <= *s && *s <= '7')
c = (c<<3) + *s++ - '0';
}
*p++ = c;
break;
case 'x':
if (isxdigit(Py_CHARMASK(*s))) {
unsigned int x = 0;
do {
c = Py_CHARMASK(*s);
s++;
x = (x<<4) & ~0xF;
if (isdigit(c))
x += c - '0';
else if (islower(c))
x += 10 + c - 'a';
else
x += 10 + c - 'A';
} while (isxdigit(Py_CHARMASK(*s)));
*p++ = x;
break;
}
/* FALLTHROUGH */
default: *p++ = '\\'; *p++ = s[-1]; break;
}
}
_PyString_Resize(&v, (int)(p - buf));
return v;
}
static PyObject *
parsestrplus(node *n)
{
PyObject *v;
int i;
REQ(CHILD(n, 0), STRING);
if ((v = parsestr(STR(CHILD(n, 0)))) != NULL) {
/* String literal concatenation */
for (i = 1; i < NCH(n); i++) {
PyObject *s;
s = parsestr(STR(CHILD(n, i)));
if (s == NULL)
goto onError;
if (PyString_Check(v) && PyString_Check(s)) {
PyString_ConcatAndDel(&v, s);
if (v == NULL)
goto onError;
}
else {
PyObject *temp;
temp = PyUnicode_Concat(v, s);
Py_DECREF(s);
if (temp == NULL)
goto onError;
Py_DECREF(v);
v = temp;
}
}
}
return v;
onError:
Py_XDECREF(v);
return NULL;
}
static void
com_list_constructor(struct compiling *c, node *n)
{
int len;
int i;
if (TYPE(n) != testlist)
REQ(n, exprlist);
/* exprlist: expr (',' expr)* [',']; likewise for testlist */
len = (NCH(n) + 1) / 2;
for (i = 0; i < NCH(n); i += 2)
com_node(c, CHILD(n, i));
com_addoparg(c, BUILD_LIST, len);
com_pop(c, len-1);
}
static void
com_dictmaker(struct compiling *c, node *n)
{
int i;
/* dictmaker: test ':' test (',' test ':' value)* [','] */
for (i = 0; i+2 < NCH(n); i += 4) {
/* We must arrange things just right for STORE_SUBSCR.
It wants the stack to look like (value) (dict) (key) */
com_addbyte(c, DUP_TOP);
com_push(c, 1);
com_node(c, CHILD(n, i+2)); /* value */
com_addbyte(c, ROT_TWO);
com_node(c, CHILD(n, i)); /* key */
com_addbyte(c, STORE_SUBSCR);
com_pop(c, 3);
}
}
static void
com_atom(struct compiling *c, node *n)
{
node *ch;
PyObject *v;
int i;
REQ(n, atom);
ch = CHILD(n, 0);
switch (TYPE(ch)) {
case LPAR:
if (TYPE(CHILD(n, 1)) == RPAR) {
com_addoparg(c, BUILD_TUPLE, 0);
com_push(c, 1);
}
else
com_node(c, CHILD(n, 1));
break;
case LSQB:
if (TYPE(CHILD(n, 1)) == RSQB) {
com_addoparg(c, BUILD_LIST, 0);
com_push(c, 1);
}
else
com_list_constructor(c, CHILD(n, 1));
break;