mirror of
https://github.com/python/cpython.git
synced 2025-11-01 02:38:53 +00:00
Several changes in one:
(1) dictionaries/mappings now have attributes values() and items() as well as keys(); at the C level, use the new function mappinggetnext() to iterate over a dictionary. (2) "class C(): ..." is now illegal; you must write "class C: ...". (3) Class objects now know their own name (finally!); and minor improvements to the way how classes, functions and methods are represented as strings. (4) Added an "access" statement and semantics. (This is still experimental -- as long as you don't use the keyword 'access' nothing should be changed.)
This commit is contained in:
Guido van Rossum
parent
687dd13bfe
commit
25831652fd
21 changed files with 1223 additions and 823 deletions
215
Python/ceval.c
215
Python/ceval.c
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@ -84,9 +84,10 @@ static int cmp_exception PROTO((object *, object *));
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static int cmp_member PROTO((object *, object *));
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static object *cmp_outcome PROTO((int, object *, object *));
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static int import_from PROTO((object *, object *, object *));
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static object *build_class PROTO((object *, object *));
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static object *build_class PROTO((object *, object *, object *));
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static void locals_2_fast PROTO((frameobject *, int));
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static void fast_2_locals PROTO((frameobject *));
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static int access_statement PROTO((object *, int, frameobject *));
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/* Pointer to current frame, used to link new frames to */
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@ -743,10 +744,12 @@ eval_code(co, globals, locals, arg)
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break;
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case BUILD_CLASS:
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w = POP();
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u = POP();
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v = POP();
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x = build_class(v, w);
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w = POP();
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x = build_class(u, v, w);
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PUSH(x);
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DECREF(u);
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DECREF(v);
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DECREF(w);
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break;
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@ -754,12 +757,24 @@ eval_code(co, globals, locals, arg)
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case STORE_NAME:
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w = GETNAMEV(oparg);
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v = POP();
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u = dict2lookup(f->f_locals, w);
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if (u != NULL && is_accessobject(u)) {
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err = setaccessvalue(u, (object *)NULL, v);
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DECREF(v);
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break;
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}
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err = dict2insert(f->f_locals, w, v);
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DECREF(v);
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break;
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case DELETE_NAME:
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w = GETNAMEV(oparg);
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u = dict2lookup(f->f_locals, w);
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if (u != NULL && is_accessobject(u)) {
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err = setaccessvalue(u, (object *)NULL,
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(object *)NULL);
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break;
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}
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if ((err = dict2remove(f->f_locals, w)) != 0)
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err_setstr(NameError, getstringvalue(w));
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break;
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@ -952,12 +967,24 @@ eval_code(co, globals, locals, arg)
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case STORE_GLOBAL:
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w = GETNAMEV(oparg);
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v = POP();
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u = dict2lookup(f->f_locals, w);
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if (u != NULL && is_accessobject(u)) {
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err = setaccessvalue(u, (object *)NULL, v);
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DECREF(v);
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break;
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}
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err = dict2insert(f->f_globals, w, v);
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DECREF(v);
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break;
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case DELETE_GLOBAL:
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w = GETNAMEV(oparg);
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u = dict2lookup(f->f_locals, w);
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if (u != NULL && is_accessobject(u)) {
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err = setaccessvalue(u, (object *)NULL,
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(object *)NULL);
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break;
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}
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if ((err = dict2remove(f->f_globals, w)) != 0)
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err_setstr(NameError, getstringvalue(w));
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break;
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@ -984,6 +1011,11 @@ eval_code(co, globals, locals, arg)
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}
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}
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}
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if (is_accessobject(x)) {
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x = getaccessvalue(x, (object *)NULL);
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if (x == NULL)
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break;
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}
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INCREF(x);
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PUSH(x);
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break;
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@ -1000,6 +1032,11 @@ eval_code(co, globals, locals, arg)
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break;
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}
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}
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if (is_accessobject(x)) {
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x = getaccessvalue(x, (object *)NULL);
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if (x == NULL)
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break;
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}
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INCREF(x);
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PUSH(x);
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break;
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@ -1011,6 +1048,11 @@ eval_code(co, globals, locals, arg)
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err_setstr(NameError, getstringvalue(w));
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break;
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}
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if (is_accessobject(x)) {
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x = getaccessvalue(x, (object *)NULL);
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if (x == NULL)
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break;
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}
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INCREF(x);
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PUSH(x);
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break;
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@ -1041,15 +1083,25 @@ eval_code(co, globals, locals, arg)
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"undefined local variable");
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break;
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}
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if (is_accessobject(x)) {
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x = getaccessvalue(x, (object *)NULL);
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if (x == NULL)
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break;
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}
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INCREF(x);
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PUSH(x);
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break;
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case STORE_FAST:
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v = POP();
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w = GETLISTITEM(fastlocals, oparg);
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if (w != NULL && is_accessobject(w)) {
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err = setaccessvalue(w, (object *)NULL, v);
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DECREF(v);
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break;
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}
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XDECREF(w);
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w = POP();
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GETLISTITEM(fastlocals, oparg) = w;
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GETLISTITEM(fastlocals, oparg) = v;
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break;
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case DELETE_FAST:
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@ -1059,6 +1111,11 @@ eval_code(co, globals, locals, arg)
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"undefined local variable");
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break;
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}
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if (w != NULL && is_accessobject(w)) {
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err = setaccessvalue(w, (object *)NULL,
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(object *)NULL);
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break;
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}
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DECREF(x);
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GETLISTITEM(fastlocals, oparg) = NULL;
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break;
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@ -1124,6 +1181,13 @@ eval_code(co, globals, locals, arg)
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err = import_from(f->f_locals, v, w);
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locals_2_fast(f, 0);
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break;
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case ACCESS_MODE:
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v = POP();
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w = GETNAMEV(oparg);
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err = access_statement(w, (int)getintvalue(v), f);
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DECREF(v);
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break;
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case JUMP_FORWARD:
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JUMPBY(oparg);
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@ -1483,7 +1547,8 @@ fast_2_locals(f)
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/* Merge f->f_fastlocals into f->f_locals */
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object *locals, *fast, *map;
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object *error_type, *error_value;
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int i;
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int pos;
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object *key, *value;
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if (f == NULL)
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return;
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locals = f->f_locals;
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@ -1495,16 +1560,10 @@ fast_2_locals(f)
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!is_dictobject(map))
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return;
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err_get(&error_type, &error_value);
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i = getdictsize(map);
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while (--i >= 0) {
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object *key;
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object *value;
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pos = 0;
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while (mappinggetnext(map, &pos, &key, &value)) {
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int j;
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key = getdict2key(map, i);
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if (key == NULL)
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continue;
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value = dict2lookup(map, key);
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if (value == NULL || !is_intobject(value))
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if (!is_intobject(value))
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continue;
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j = getintvalue(value);
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value = getlistitem(fast, j);
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@ -1529,7 +1588,8 @@ locals_2_fast(f, clear)
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/* Merge f->f_locals into f->f_fastlocals */
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object *locals, *fast, *map;
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object *error_type, *error_value;
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int i;
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int pos;
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object *key, *value;
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if (f == NULL)
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return;
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locals = f->f_locals;
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@ -1541,16 +1601,10 @@ locals_2_fast(f, clear)
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!is_dictobject(map))
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return;
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err_get(&error_type, &error_value);
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i = getdictsize(map);
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while (--i >= 0) {
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object *key;
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object *value;
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pos = 0;
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while (mappinggetnext(map, &pos, &key, &value)) {
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int j;
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key = getdict2key(map, i);
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if (key == NULL)
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continue;
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value = dict2lookup(map, key);
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if (value == NULL || !is_intobject(value))
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if (!is_intobject(value))
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continue;
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j = getintvalue(value);
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value = dict2lookup(locals, key);
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@ -1907,14 +1961,7 @@ call_builtin(func, arg)
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return (*meth)(self, arg);
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}
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if (is_classobject(func)) {
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if (arg != NULL &&
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!(is_tupleobject(arg) &&
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gettuplesize(arg) == 0)) {
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err_setstr(TypeError,
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"classobject() allows no arguments");
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return NULL;
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}
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return newinstanceobject(func);
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return newinstanceobject(func, arg);
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}
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err_setstr(TypeError, "call of non-function");
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return NULL;
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@ -2258,19 +2305,14 @@ import_from(locals, v, name)
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object *w, *x;
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w = getmoduledict(v);
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if (getstringvalue(name)[0] == '*') {
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int i;
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int n = getdictsize(w);
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for (i = 0; i < n; i++) {
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name = getdict2key(w, i);
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if (name == NULL || getstringvalue(name)[0] == '_')
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int pos;
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object *name, *value;
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pos = 0;
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while (mappinggetnext(w, &pos, &name, &value)) {
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if (!is_stringobject(name) ||
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getstringvalue(name)[0] == '_')
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continue;
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x = dict2lookup(w, name);
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if (x == NULL) {
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/* XXX can't happen? */
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err_setstr(SystemError, getstringvalue(name));
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return -1;
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}
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if (dict2insert(locals, name, x) != 0)
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if (dict2insert(locals, name, value) != 0)
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return -1;
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}
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return 0;
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@ -2290,27 +2332,74 @@ import_from(locals, v, name)
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}
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static object *
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build_class(v, w)
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object *v; /* None or tuple containing base classes */
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object *w; /* dictionary */
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build_class(methods, bases, name)
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object *methods; /* dictionary */
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object *bases; /* tuple containing classes */
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object *name; /* string */
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{
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if (is_tupleobject(v)) {
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int i;
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for (i = gettuplesize(v); --i >= 0; ) {
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object *x = gettupleitem(v, i);
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if (!is_classobject(x)) {
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err_setstr(TypeError,
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"base is not a class object");
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return NULL;
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}
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}
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int i;
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if (!is_tupleobject(bases)) {
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err_setstr(SystemError, "build_class with non-tuple bases");
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return NULL;
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}
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else {
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v = NULL;
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}
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if (!is_dictobject(w)) {
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if (!is_dictobject(methods)) {
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err_setstr(SystemError, "build_class with non-dictionary");
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return NULL;
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}
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return newclassobject(v, w, (object *) NULL);
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if (!is_stringobject(name)) {
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err_setstr(SystemError, "build_class witn non-string name");
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return NULL;
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}
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for (i = gettuplesize(bases); --i >= 0; ) {
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object *base = gettupleitem(bases, i);
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if (!is_classobject(base)) {
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err_setstr(TypeError,
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"base is not a class object");
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return NULL;
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}
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}
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return newclassobject(bases, methods, name);
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}
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static int
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access_statement(name, mode, f)
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object *name;
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int mode;
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frameobject *f;
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{
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object *value;
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int i = -1;
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object *ac;
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int ret;
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if (f->f_localmap == NULL)
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value = dict2lookup(f->f_locals, name);
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else {
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value = dict2lookup(f->f_localmap, name);
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if (value == NULL || !is_intobject(value))
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value = NULL;
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else {
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i = getintvalue(value);
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if (0 <= i && i < getlistsize(f->f_fastlocals))
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value = getlistitem(f->f_fastlocals, i);
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else {
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value = NULL;
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i = -1;
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}
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}
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}
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if (value && is_accessobject(value)) {
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err_setstr(AccessError, "can't override access");
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return -1;
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}
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err_clear();
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ac = newaccessobject(value, (object*)NULL, (typeobject*)NULL, mode);
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if (ac == NULL)
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return -1;
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if (i >= 0)
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ret = setlistitem(f->f_fastlocals, i, ac);
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else {
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ret = dict2insert(f->f_locals, name, ac);
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DECREF(ac);
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}
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return ret;
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}
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