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cpython
Kaydet (Commit) b6fc9df8 authored tarafından Neal Norwitz's avatar Neal Norwitz
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Fix a lot of memory and ref leaks in error paths. 

(Call symtable_exit_block or compiler_exit_scope as appropriate)

Use PyMem_Free on c_future since it was allocated with PyMem_Malloc
üst 6576bd84
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Showing with 110 additions and 42 deletions
Python/compile.c
Dosyayı görüntüle @ b6fc9df8
......@@ -302,7 +302,7 @@ compiler_free(struct compiler *c)
if (c->c_st)
PySymtable_Free(c->c_st);
if (c->c_future)
PyObject_Free((void *)c->c_future);
PyMem_Free(c->c_future);
Py_DECREF(c->c_stack);
}
......@@ -1607,6 +1607,13 @@ compiler_addop_j(struct compiler *c, int opcode, basicblock *b, int absolute)
return 0; \
}
#define ADDOP_IN_SCOPE(C, OP) { \
if (!compiler_addop((C), (OP))) { \
compiler_exit_scope(c); \
return 0; \
} \
}
#define ADDOP_O(C, OP, O, TYPE) { \
if (!compiler_addop_o((C), (OP), (C)->u->u_ ## TYPE, (O))) \
return 0; \
......@@ -1641,6 +1648,13 @@ compiler_addop_j(struct compiler *c, int opcode, basicblock *b, int absolute)
return 0; \
}
#define VISIT_IN_SCOPE(C, TYPE, V) {\
if (!compiler_visit_ ## TYPE((C), (V))) { \
compiler_exit_scope(c); \
return 0; \
} \
}
#define VISIT_SLICE(C, V, CTX) {\
if (!compiler_visit_slice((C), (V), (CTX))) \
return 0; \
......@@ -1656,6 +1670,18 @@ compiler_addop_j(struct compiler *c, int opcode, basicblock *b, int absolute)
} \
}
#define VISIT_SEQ_IN_SCOPE(C, TYPE, SEQ) { \
int i; \
asdl_seq *seq = (SEQ); /* avoid variable capture */ \
for (i = 0; i < asdl_seq_LEN(seq); i++) { \
TYPE ## _ty elt = asdl_seq_GET(seq, i); \
if (!compiler_visit_ ## TYPE((C), elt)) { \
compiler_exit_scope(c); \
return 0; \
} \
} \
}
static int
compiler_isdocstring(stmt_ty s)
{
......@@ -1708,15 +1734,15 @@ compiler_mod(struct compiler *c, mod_ty mod)
break;
case Interactive_kind:
c->c_interactive = 1;
VISIT_SEQ(c, stmt, mod->v.Interactive.body);
VISIT_SEQ_IN_SCOPE(c, stmt, mod->v.Interactive.body);
break;
case Expression_kind:
VISIT(c, expr, mod->v.Expression.body);
VISIT_IN_SCOPE(c, expr, mod->v.Expression.body);
addNone = 0;
break;
case Suite_kind:
assert(0); /* XXX: what should we do here? */
VISIT_SEQ(c, stmt, mod->v.Suite.body);
VISIT_SEQ_IN_SCOPE(c, stmt, mod->v.Suite.body);
break;
default:
assert(0);
......@@ -1890,7 +1916,7 @@ compiler_function(struct compiler *c, stmt_ty s)
if (i == 0 && s2->kind == Expr_kind &&
s2->v.Expr.value->kind == Str_kind)
continue;
VISIT(c, stmt, s2);
VISIT_IN_SCOPE(c, stmt, s2);
}
co = assemble(c, 1);
compiler_exit_scope(c);
......@@ -1945,8 +1971,8 @@ compiler_class(struct compiler *c, stmt_ty s)
return 0;
}
ADDOP(c, LOAD_LOCALS);
ADDOP(c, RETURN_VALUE);
ADDOP_IN_SCOPE(c, LOAD_LOCALS);
ADDOP_IN_SCOPE(c, RETURN_VALUE);
co = assemble(c, 1);
compiler_exit_scope(c);
if (co == NULL)
......@@ -1981,8 +2007,8 @@ compiler_lambda(struct compiler *c, expr_ty e)
compiler_arguments(c, args);
c->u->u_argcount = asdl_seq_LEN(args->args);
VISIT(c, expr, e->v.Lambda.body);
ADDOP(c, RETURN_VALUE);
VISIT_IN_SCOPE(c, expr, e->v.Lambda.body);
ADDOP_IN_SCOPE(c, RETURN_VALUE);
co = assemble(c, 1);
compiler_exit_scope(c);
if (co == NULL)
......
Python/symtable.c
Dosyayı görüntüle @ b6fc9df8
......@@ -16,7 +16,7 @@ PySTEntry_New(struct symtable *st, identifier name, _Py_block_ty block,
void *key, int lineno)
{
PySTEntryObject *ste = NULL;
PyObject *k, *v;
PyObject *k;
k = PyLong_FromVoidPtr(key);
if (k == NULL)
......@@ -29,21 +29,22 @@ PySTEntry_New(struct symtable *st, identifier name, _Py_block_ty block,
ste->ste_name = name;
Py_INCREF(name);
v = PyDict_New();
if (v == NULL)
ste->ste_symbols = NULL;
ste->ste_varnames = NULL;
ste->ste_children = NULL;
ste->ste_symbols = PyDict_New();
if (ste->ste_symbols == NULL)
goto fail;
ste->ste_symbols = v;
v = PyList_New(0);
if (v == NULL)
ste->ste_varnames = PyList_New(0);
if (ste->ste_varnames == NULL)
goto fail;
ste->ste_varnames = v;
v = PyList_New(0);
if (v == NULL)
ste->ste_children = PyList_New(0);
if (ste->ste_children == NULL)
goto fail;
ste->ste_children = v;
ste->ste_type = block;
ste->ste_unoptimized = 0;
......@@ -187,6 +188,8 @@ symtable_new(void)
return NULL;
st->st_filename = NULL;
st->st_symbols = NULL;
if ((st->st_stack = PyList_New(0)) == NULL)
goto fail;
if ((st->st_symbols = PyDict_New()) == NULL)
......@@ -236,13 +239,18 @@ PySymtable_Build(mod_ty mod, const char *filename, PyFutureFeatures *future)
case Suite_kind:
PyErr_SetString(PyExc_RuntimeError,
"this compiler does not handle Suites");
return NULL;
goto error;
}
if (!symtable_exit_block(st, (void *)mod))
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;
}
......@@ -266,15 +274,15 @@ PySymtable_Lookup(struct symtable *st, void *key)
v = PyDict_GetItem(st->st_symbols, k);
if (v) {
assert(PySTEntry_Check(v));
Py_DECREF(k);
Py_INCREF(v);
return (PySTEntryObject *)v;
}
else {
PyErr_SetString(PyExc_KeyError,
"unknown symbol table entry");
return NULL;
}
Py_DECREF(k);
return (PySTEntryObject *)v;
}
int
......@@ -329,8 +337,11 @@ PyST_GetScope(PySTEntryObject *ste, PyObject *name)
PyObject *o = PyInt_FromLong(I); \
if (!o) \
return 0; \
if (PyDict_SetItem((DICT), (NAME), o) < 0) \
if (PyDict_SetItem((DICT), (NAME), o) < 0) { \
Py_DECREF(o); \
return 0; \
} \
Py_DECREF(o); \
}
/* Decide on scope of name, given flags.
......@@ -536,6 +547,7 @@ update_symbols(PyObject *symbols, PyObject *scope,
Py_DECREF(free_value);
return 0;
}
Py_DECREF(o);
}
/* else it's not free, probably a cell */
continue;
......@@ -663,7 +675,7 @@ symtable_analyze(struct symtable *st)
return 0;
global = PyDict_New();
if (!global) {
Py_DECREF(global);
Py_DECREF(free);
return 0;
}
r = analyze_block(st->st_top, NULL, free, global);
......@@ -820,7 +832,13 @@ error:
#define VISIT(ST, TYPE, V) \
if (!symtable_visit_ ## TYPE((ST), (V))) \
return 0;
#define VISIT_IN_BLOCK(ST, TYPE, V, S) \
if (!symtable_visit_ ## TYPE((ST), (V))) { \
symtable_exit_block((ST), (S)); \
return 0; \
}
#define VISIT_SEQ(ST, TYPE, SEQ) { \
int i; \
asdl_seq *seq = (SEQ); /* avoid variable capture */ \
......@@ -830,7 +848,19 @@ error:
return 0; \
} \
}
#define VISIT_SEQ_IN_BLOCK(ST, TYPE, SEQ, S) { \
int i; \
asdl_seq *seq = (SEQ); /* avoid variable capture */ \
for (i = 0; i < asdl_seq_LEN(seq); i++) { \
TYPE ## _ty elt = asdl_seq_GET(seq, i); \
if (!symtable_visit_ ## TYPE((ST), elt)) { \
symtable_exit_block((ST), (S)); \
return 0; \
} \
} \
}
#define VISIT_SEQ_TAIL(ST, TYPE, SEQ, START) { \
int i; \
asdl_seq *seq = (SEQ); /* avoid variable capture */ \
......@@ -840,7 +870,19 @@ error:
return 0; \
} \
}
#define VISIT_SEQ_TAIL_IN_BLOCK(ST, TYPE, SEQ, START, S) { \
int i; \
asdl_seq *seq = (SEQ); /* avoid variable capture */ \
for (i = (START); i < asdl_seq_LEN(seq); i++) { \
TYPE ## _ty elt = asdl_seq_GET(seq, i); \
if (!symtable_visit_ ## TYPE((ST), elt)) { \
symtable_exit_block((ST), (S)); \
return 0; \
} \
} \
}
static int
symtable_visit_stmt(struct symtable *st, stmt_ty s)
{
......@@ -855,8 +897,8 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
if (!symtable_enter_block(st, s->v.FunctionDef.name,
FunctionBlock, (void *)s, s->lineno))
return 0;
VISIT(st, arguments, s->v.FunctionDef.args);
VISIT_SEQ(st, stmt, s->v.FunctionDef.body);
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;
......@@ -870,7 +912,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
return 0;
tmp = st->st_private;
st->st_private = s->v.ClassDef.name;
VISIT_SEQ(st, stmt, s->v.ClassDef.body);
VISIT_SEQ_IN_BLOCK(st, stmt, s->v.ClassDef.body, s);
st->st_private = tmp;
if (!symtable_exit_block(st, s))
return 0;
......@@ -977,7 +1019,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
if (cur < 0)
return 0;
if (cur & (DEF_LOCAL | USE)) {
char buf[1000];
char buf[256];
if (cur & DEF_LOCAL)
PyOS_snprintf(buf, sizeof(buf),
GLOBAL_AFTER_ASSIGN,
......@@ -991,9 +1033,7 @@ symtable_visit_stmt(struct symtable *st, stmt_ty s)
}
if (!symtable_add_def(st, name, DEF_GLOBAL))
return 0;
}
break;
}
case Expr_kind:
......@@ -1031,8 +1071,8 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
if (!symtable_enter_block(st, GET_IDENTIFIER(lambda),
FunctionBlock, (void *)e, 0))
return 0;
VISIT(st, arguments, e->v.Lambda.args);
VISIT(st, expr, e->v.Lambda.body);
VISIT_IN_BLOCK(st, arguments, e->v.Lambda.args, (void*)e);
VISIT_IN_BLOCK(st, expr, e->v.Lambda.body, (void*)e);
if (!symtable_exit_block(st, (void *)e))
return 0;
break;
......@@ -1302,12 +1342,14 @@ symtable_visit_genexp(struct symtable *st, expr_ty e)
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(st, expr, outermost->target);
VISIT_SEQ(st, expr, outermost->ifs);
VISIT_SEQ_TAIL(st, comprehension, e->v.GeneratorExp.generators, 1);
VISIT(st, expr, e->v.GeneratorExp.elt);
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);
if (!symtable_exit_block(st, (void *)e))
return 0;
return 1;
......
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