struct symtable *
PySymtable_Build(mod_ty mod, const char *filename, PyFutureFeatures *future)
{
struct symtable *st = symtable_new();
asdl_seq *seq;
int i;
if (st == NULL)
return st;
st->st_filename = filename;
st->st_future = future;
if (!GET_IDENTIFIER(top) ||
!symtable_enter_block(st, top, ModuleBlock, (void *)mod, 0)) {
PySymtable_Free(st);
return NULL;
}
st->st_top = st->st_cur;
st->st_cur->ste_unoptimized = OPT_TOPLEVEL;
/* Any other top-level initialization? */
switch (mod->kind) {
case Module_kind:
seq = mod->v.Module.body;
for (i = 0; i < asdl_seq_LEN(seq); i++)
if (!symtable_visit_stmt(st,
(stmt_ty)asdl_seq_GET(seq, i)))
goto error;
break;
case Expression_kind:
if (!symtable_visit_expr(st, mod->v.Expression.body))
goto error;
break;
case Interactive_kind:
seq = mod->v.Interactive.body;
for (i = 0; i < asdl_seq_LEN(seq); i++)
if (!symtable_visit_stmt(st,
(stmt_ty)asdl_seq_GET(seq, i)))
goto error;
break;
case Suite_kind:
PyErr_SetString(PyExc_RuntimeError,
"this compiler does not handle Suites");
goto error;
}
if (!symtable_exit_block(st, (void *)mod)) {
PySymtable_Free(st);
return NULL;
}
if (symtable_analyze(st))
return st;
PySymtable_Free(st);
return NULL;
error:
(void) symtable_exit_block(st, (void *)mod);
PySymtable_Free(st);
return NULL;
}
static int
future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
{
int i, found_docstring = 0, done = 0, prev_line = 0;
if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
return 1;
/* A subsequent pass will detect future imports that don't
appear at the beginning of the file. There's one case,
however, that is easier to handle here: A series of imports
joined by semi-colons, where the first import is a future
statement but some subsequent import has the future form
but is preceded by a regular import.
*/
for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
if (done && s->lineno > prev_line)
return 1;
prev_line = s->lineno;
/* The tests below will return from this function unless it is
still possible to find a future statement. The only things
that can precede a future statement are another future
statement and a doc string.
*/
if (s->kind == ImportFrom_kind) {
identifier modname = s->v.ImportFrom.module;
if (modname && PyString_GET_SIZE(modname) == 10 &&
!strcmp(PyString_AS_STRING(modname), "__future__")) {
if (done) {
PyErr_SetString(PyExc_SyntaxError,
ERR_LATE_FUTURE);
PyErr_SyntaxLocation(filename,
s->lineno);
return 0;
}
if (!future_check_features(ff, s, filename))
return 0;
ff->ff_lineno = s->lineno;
}
else
done = 1;
}
else if (s->kind == Expr_kind && !found_docstring) {
expr_ty e = s->v.Expr.value;
if (e->kind != Str_kind)
done = 1;
else
found_docstring = 1;
}
else
done = 1;
}
return 1;
}
static int
future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)
{
int i, done = 0, prev_line = 0;
if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
return 1;
if (asdl_seq_LEN(mod->v.Module.body) == 0)
return 1;
/* A subsequent pass will detect future imports that don't
appear at the beginning of the file. There's one case,
however, that is easier to handle here: A series of imports
joined by semi-colons, where the first import is a future
statement but some subsequent import has the future form
but is preceded by a regular import.
*/
i = 0;
if (_PyAST_GetDocString(mod->v.Module.body) != NULL)
i++;
for (; i < asdl_seq_LEN(mod->v.Module.body); i++) {
stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
if (done && s->lineno > prev_line)
return 1;
prev_line = s->lineno;
/* The tests below will return from this function unless it is
still possible to find a future statement. The only things
that can precede a future statement are another future
statement and a doc string.
*/
if (s->kind == ImportFrom_kind) {
identifier modname = s->v.ImportFrom.module;
if (modname &&
_PyUnicode_EqualToASCIIString(modname, "__future__")) {
if (done) {
PyErr_SetString(PyExc_SyntaxError,
ERR_LATE_FUTURE);
PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
return 0;
}
if (!future_check_features(ff, s, filename))
return 0;
ff->ff_lineno = s->lineno;
}
else {
done = 1;
}
}
else {
done = 1;
}
}
return 1;
}
static int
symtable_visit_genexp(struct symtable *st, expr_ty e)
{
comprehension_ty outermost = ((comprehension_ty)
(asdl_seq_GET(e->v.GeneratorExp.generators, 0)));
/* Outermost iterator is evaluated in current scope */
VISIT(st, expr, outermost->iter);
/* Create generator scope for the rest */
if (!GET_IDENTIFIER(genexpr) ||
!symtable_enter_block(st, genexpr, FunctionBlock, (void *)e, 0)) {
return 0;
}
st->st_cur->ste_generator = 1;
/* Outermost iter is received as an argument */
if (!symtable_implicit_arg(st, 0)) {
symtable_exit_block(st, (void *)e);
return 0;
}
VISIT_IN_BLOCK(st, expr, outermost->target, (void*)e);
VISIT_SEQ_IN_BLOCK(st, expr, outermost->ifs, (void*)e);
VISIT_SEQ_TAIL_IN_BLOCK(st, comprehension,
e->v.GeneratorExp.generators, 1, (void*)e);
VISIT_IN_BLOCK(st, expr, e->v.GeneratorExp.elt, (void*)e);
return symtable_exit_block(st, (void *)e);
}
static int
symtable_visit_params_nested(struct symtable *st, asdl_seq *args)
{
int i;
for (i = 0; i < asdl_seq_LEN(args); i++) {
expr_ty arg = (expr_ty)asdl_seq_GET(args, i);
if (arg->kind == Tuple_kind &&
!symtable_visit_params(st, arg->v.Tuple.elts, 0))
return 0;
}
return 1;
}
static int
future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename)
{
int i;
asdl_seq *names;
assert(s->kind == ImportFrom_kind);
names = s->v.ImportFrom.names;
for (i = 0; i < asdl_seq_LEN(names); i++) {
alias_ty name = (alias_ty)asdl_seq_GET(names, i);
const char *feature = PyUnicode_AsUTF8(name->name);
if (!feature)
return 0;
if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
continue;
} else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
continue;
} else if (strcmp(feature, FUTURE_DIVISION) == 0) {
continue;
} else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
continue;
} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
continue;
} else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
continue;
} else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
continue;
} else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {
ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
} else if (strcmp(feature, FUTURE_GENERATOR_STOP) == 0) {
continue;
} else if (strcmp(feature, FUTURE_ANNOTATIONS) == 0) {
ff->ff_features |= CO_FUTURE_ANNOTATIONS;
} else if (strcmp(feature, "braces") == 0) {
PyErr_SetString(PyExc_SyntaxError,
"not a chance");
PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
return 0;
} else {
PyErr_Format(PyExc_SyntaxError,
UNDEFINED_FUTURE_FEATURE, feature);
PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
return 0;
}
}
return 1;
}
static int
fold_unaryop(expr_ty node, PyArena *arena, int optimize)
{
expr_ty arg = node->v.UnaryOp.operand;
if (!is_const(arg)) {
/* Fold not into comparison */
if (node->v.UnaryOp.op == Not && arg->kind == Compare_kind &&
asdl_seq_LEN(arg->v.Compare.ops) == 1) {
/* Eq and NotEq are often implemented in terms of one another, so
folding not (self == other) into self != other breaks implementation
of !=. Detecting such cases doesn't seem worthwhile.
Python uses </> for 'is subset'/'is superset' operations on sets.
They don't satisfy not folding laws. */
int op = asdl_seq_GET(arg->v.Compare.ops, 0);
switch (op) {
case Is:
op = IsNot;
break;
case IsNot:
op = Is;
break;
case In:
op = NotIn;
break;
case NotIn:
op = In;
break;
default:
op = 0;
}
if (op) {
asdl_seq_SET(arg->v.Compare.ops, 0, op);
COPY_NODE(node, arg);
return 1;
}
}
return 1;
}
typedef PyObject *(*unary_op)(PyObject*);
static const unary_op ops[] = {
[Invert] = PyNumber_Invert,
[Not] = unary_not,
[UAdd] = PyNumber_Positive,
[USub] = PyNumber_Negative,
};
static int
future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
{
int i;
asdl_seq *names;
assert(s->kind == ImportFrom_kind);
names = s->v.ImportFrom.names;
for (i = 0; i < asdl_seq_LEN(names); i++) {
alias_ty name = (alias_ty)asdl_seq_GET(names, i);
const char *feature = PyString_AsString(name->name);
if (!feature)
return 0;
if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
continue;
} else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
continue;
} else if (strcmp(feature, FUTURE_DIVISION) == 0) {
ff->ff_features |= CO_FUTURE_DIVISION;
} else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
} else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
ff->ff_features |= CO_FUTURE_PRINT_FUNCTION;
} else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
ff->ff_features |= CO_FUTURE_UNICODE_LITERALS;
} else if (strcmp(feature, "braces") == 0) {
PyErr_SetString(PyExc_SyntaxError,
"hell yeah!!!");
PyErr_SyntaxLocation(filename, s->lineno);
return 0;
} else {
PyErr_Format(PyExc_SyntaxError,
UNDEFINED_FUTURE_FEATURE, feature);
PyErr_SyntaxLocation(filename, s->lineno);
return 0;
}
}
return 1;
}
static int
symtable_visit_params(struct symtable *st, asdl_seq *args, int toplevel)
{
int i;
/* go through all the toplevel arguments first */
for (i = 0; i < asdl_seq_LEN(args); i++) {
expr_ty arg = (expr_ty)asdl_seq_GET(args, i);
if (arg->kind == Name_kind) {
assert(arg->v.Name.ctx == Param ||
(arg->v.Name.ctx == Store && !toplevel));
if (!symtable_add_def(st, arg->v.Name.id, DEF_PARAM))
return 0;
}
else if (arg->kind == Tuple_kind) {
assert(arg->v.Tuple.ctx == Store);
if (toplevel) {
if (!symtable_implicit_arg(st, i))
return 0;
}
}
else {
PyErr_SetString(PyExc_SyntaxError,
"invalid expression in parameter list");
PyErr_SyntaxLocation(st->st_filename,
st->st_cur->ste_lineno);
return 0;
}
}
if (!toplevel) {
if (!symtable_visit_params_nested(st, args))
return 0;
}
return 1;
}
static int
symtable_handle_comprehension(struct symtable *st, expr_ty e,
identifier scope_name, asdl_seq *generators,
expr_ty elt, expr_ty value)
{
int is_generator = (e->kind == GeneratorExp_kind);
int needs_tmp = !is_generator;
comprehension_ty outermost = ((comprehension_ty)
asdl_seq_GET(generators, 0));
/* Outermost iterator is evaluated in current scope */
VISIT(st, expr, outermost->iter);
/* Create comprehension scope for the rest */
if (!scope_name ||
!symtable_enter_block(st, scope_name, FunctionBlock, (void *)e, 0)) {
return 0;
}
st->st_cur->ste_generator = is_generator;
/* Outermost iter is received as an argument */
if (!symtable_implicit_arg(st, 0)) {
symtable_exit_block(st, (void *)e);
return 0;
}
/* Allocate temporary name if needed */
if (needs_tmp && !symtable_new_tmpname(st)) {
symtable_exit_block(st, (void *)e);
return 0;
}
VISIT_IN_BLOCK(st, expr, outermost->target, (void*)e);
VISIT_SEQ_IN_BLOCK(st, expr, outermost->ifs, (void*)e);
VISIT_SEQ_TAIL_IN_BLOCK(st, comprehension,
generators, 1, (void*)e);
if (value)
VISIT_IN_BLOCK(st, expr, value, (void*)e);
VISIT_IN_BLOCK(st, expr, elt, (void*)e);
return symtable_exit_block(st, (void *)e);
}
static int
symtable_visit_stmt(struct symtable *st, stmt_ty s)
{
switch (s->kind) {
case FunctionDef_kind:
if (!symtable_add_def(st, s->v.FunctionDef.name, DEF_LOCAL))
return 0;
if (s->v.FunctionDef.args->defaults)
VISIT_SEQ(st, expr, s->v.FunctionDef.args->defaults);
if (s->v.FunctionDef.decorator_list)
VISIT_SEQ(st, expr, s->v.FunctionDef.decorator_list);
if (!symtable_enter_block(st, s->v.FunctionDef.name,
FunctionBlock, (void *)s, s->lineno))
return 0;
VISIT_IN_BLOCK(st, arguments, s->v.FunctionDef.args, s);
VISIT_SEQ_IN_BLOCK(st, stmt, s->v.FunctionDef.body, s);
if (!symtable_exit_block(st, s))
return 0;
break;
case ClassDef_kind: {
PyObject *tmp;
if (!symtable_add_def(st, s->v.ClassDef.name, DEF_LOCAL))
return 0;
VISIT_SEQ(st, expr, s->v.ClassDef.bases);
if (s->v.ClassDef.decorator_list)
VISIT_SEQ(st, expr, s->v.ClassDef.decorator_list);
if (!symtable_enter_block(st, s->v.ClassDef.name, ClassBlock,
(void *)s, s->lineno))
return 0;
tmp = st->st_private;
st->st_private = s->v.ClassDef.name;
VISIT_SEQ_IN_BLOCK(st, stmt, s->v.ClassDef.body, s);
st->st_private = tmp;
if (!symtable_exit_block(st, s))
return 0;
break;
}
case Return_kind:
if (s->v.Return.value) {
VISIT(st, expr, s->v.Return.value);
st->st_cur->ste_returns_value = 1;
if (st->st_cur->ste_generator) {
PyErr_SetString(PyExc_SyntaxError,
RETURN_VAL_IN_GENERATOR);
PyErr_SyntaxLocation(st->st_filename,
s->lineno);
return 0;
}
}
break;
case Delete_kind:
VISIT_SEQ(st, expr, s->v.Delete.targets);
break;
case Assign_kind:
VISIT_SEQ(st, expr, s->v.Assign.targets);
VISIT(st, expr, s->v.Assign.value);
break;
case AugAssign_kind:
VISIT(st, expr, s->v.AugAssign.target);
VISIT(st, expr, s->v.AugAssign.value);
break;
case Print_kind:
if (s->v.Print.dest)
VISIT(st, expr, s->v.Print.dest);
VISIT_SEQ(st, expr, s->v.Print.values);
break;
case For_kind:
VISIT(st, expr, s->v.For.target);
VISIT(st, expr, s->v.For.iter);
VISIT_SEQ(st, stmt, s->v.For.body);
if (s->v.For.orelse)
VISIT_SEQ(st, stmt, s->v.For.orelse);
break;
case While_kind:
VISIT(st, expr, s->v.While.test);
VISIT_SEQ(st, stmt, s->v.While.body);
if (s->v.While.orelse)
VISIT_SEQ(st, stmt, s->v.While.orelse);
break;
case If_kind:
/* XXX if 0: and lookup_yield() hacks */
VISIT(st, expr, s->v.If.test);
VISIT_SEQ(st, stmt, s->v.If.body);
if (s->v.If.orelse)
VISIT_SEQ(st, stmt, s->v.If.orelse);
break;
case Raise_kind:
if (s->v.Raise.type) {
VISIT(st, expr, s->v.Raise.type);
if (s->v.Raise.inst) {
VISIT(st, expr, s->v.Raise.inst);
if (s->v.Raise.tback)
VISIT(st, expr, s->v.Raise.tback);
}
}
break;
case TryExcept_kind:
VISIT_SEQ(st, stmt, s->v.TryExcept.body);
VISIT_SEQ(st, stmt, s->v.TryExcept.orelse);
VISIT_SEQ(st, excepthandler, s->v.TryExcept.handlers);
break;
case TryFinally_kind:
VISIT_SEQ(st, stmt, s->v.TryFinally.body);
VISIT_SEQ(st, stmt, s->v.TryFinally.finalbody);
break;
case Assert_kind:
VISIT(st, expr, s->v.Assert.test);
if (s->v.Assert.msg)
VISIT(st, expr, s->v.Assert.msg);
break;
case Import_kind:
VISIT_SEQ(st, alias, s->v.Import.names);
/* XXX Don't have the lineno available inside
visit_alias */
if (st->st_cur->ste_unoptimized && !st->st_cur->ste_opt_lineno)
st->st_cur->ste_opt_lineno = s->lineno;
break;
case ImportFrom_kind:
VISIT_SEQ(st, alias, s->v.ImportFrom.names);
/* XXX Don't have the lineno available inside
visit_alias */
if (st->st_cur->ste_unoptimized && !st->st_cur->ste_opt_lineno)
st->st_cur->ste_opt_lineno = s->lineno;
break;
case Exec_kind:
VISIT(st, expr, s->v.Exec.body);
if (!st->st_cur->ste_opt_lineno)
st->st_cur->ste_opt_lineno = s->lineno;
if (s->v.Exec.globals) {
st->st_cur->ste_unoptimized |= OPT_EXEC;
VISIT(st, expr, s->v.Exec.globals);
if (s->v.Exec.locals)
VISIT(st, expr, s->v.Exec.locals);
} else {
st->st_cur->ste_unoptimized |= OPT_BARE_EXEC;
}
break;
case Global_kind: {
int i;
asdl_seq *seq = s->v.Global.names;
for (i = 0; i < asdl_seq_LEN(seq); i++) {
identifier name = (identifier)asdl_seq_GET(seq, i);
char *c_name = PyString_AS_STRING(name);
long cur = symtable_lookup(st, name);
if (cur < 0)
return 0;
if (cur & (DEF_LOCAL | USE)) {
char buf[256];
if (cur & DEF_LOCAL)
PyOS_snprintf(buf, sizeof(buf),
GLOBAL_AFTER_ASSIGN,
c_name);
else
PyOS_snprintf(buf, sizeof(buf),
GLOBAL_AFTER_USE,
c_name);
if (!symtable_warn(st, buf, s->lineno))
return 0;
}
if (!symtable_add_def(st, name, DEF_GLOBAL))
return 0;
}
break;
}
case Expr_kind:
VISIT(st, expr, s->v.Expr.value);
break;
case Pass_kind:
case Break_kind:
case Continue_kind:
/* nothing to do here */
break;
case With_kind:
VISIT(st, expr, s->v.With.context_expr);
if (s->v.With.optional_vars) {
VISIT(st, expr, s->v.With.optional_vars);
}
VISIT_SEQ(st, stmt, s->v.With.body);
break;
}
return 1;
}
