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[3.6] bpo-27169: The __debug__ constant is now optimized out at compile time. (GH-4880) by serhiy-storchaka · Pull Request #4882 · python/cpython

Expand Up @@ -1343,13 +1343,15 @@ is_const(expr_ty e) case Ellipsis_kind: case NameConstant_kind: return 1; case Name_kind: return _PyUnicode_EqualToASCIIString(e->v.Name.id, "__debug__"); default: return 0; } }
static PyObject * get_const_value(expr_ty e) get_const_value(struct compiler *c, expr_ty e) { switch (e->kind) { case Constant_kind: Expand All @@ -1364,6 +1366,9 @@ get_const_value(expr_ty e) return Py_Ellipsis; case NameConstant_kind: return e->v.NameConstant.value; case Name_kind: assert(_PyUnicode_EqualToASCIIString(e->v.Name.id, "__debug__")); return c->c_optimize ? Py_False : Py_True; default: assert(!is_const(e)); return NULL; Expand Down Expand Up @@ -3035,6 +3040,11 @@ compiler_nameop(struct compiler *c, identifier name, expr_context_ty ctx) !_PyUnicode_EqualToASCIIString(name, "True") && !_PyUnicode_EqualToASCIIString(name, "False"));
if (ctx == Load && _PyUnicode_EqualToASCIIString(name, "__debug__")) { ADDOP_O(c, LOAD_CONST, c->c_optimize ? Py_False : Py_True, consts); return 1; }
op = 0; optype = OP_NAME; scope = PyST_GetScope(c->u->u_ste, mangled); Expand Down Expand Up @@ -3298,7 +3308,7 @@ compiler_subdict(struct compiler *c, expr_ty e, Py_ssize_t begin, Py_ssize_t end return 0; } for (i = begin; i < end; i++) { key = get_const_value((expr_ty)asdl_seq_GET(e->v.Dict.keys, i)); key = get_const_value(c, (expr_ty)asdl_seq_GET(e->v.Dict.keys, i)); Py_INCREF(key); PyTuple_SET_ITEM(keys, i - begin, key); } Expand Down Expand Up @@ -4044,35 +4054,10 @@ compiler_visit_keyword(struct compiler *c, keyword_ty k) static int expr_constant(struct compiler *c, expr_ty e) { char *id; switch (e->kind) { case Ellipsis_kind: return 1; case Constant_kind: return PyObject_IsTrue(e->v.Constant.value); case Num_kind: return PyObject_IsTrue(e->v.Num.n); case Str_kind: return PyObject_IsTrue(e->v.Str.s); case Name_kind: /* optimize away names that can't be reassigned */ id = PyUnicode_AsUTF8(e->v.Name.id); if (id && strcmp(id, "__debug__") == 0) return !c->c_optimize; return -1; case NameConstant_kind: { PyObject *o = e->v.NameConstant.value; if (o == Py_None) return 0; else if (o == Py_True) return 1; else if (o == Py_False) return 0; } /* fall through */ default: return -1; if (is_const(e)) { return PyObject_IsTrue(get_const_value(c, e)); } return -1; }

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