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61 lines
1.8 KiB
61 lines
1.8 KiB
/*
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* Duktape 1.0 issue: cannot set Duktape/C function 'name' property after
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* creation.
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*
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* The cause: Function.prototype.name, containing an empty string, is
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* non-writable. This is an unintended side effect of all built-in
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* functions (such as Array, Math.cos, etc) having a non-writable name.
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* Function.prototype, although never really called, is technically a
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* function so its empty name is unintentionally non-writable.
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*
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* Fixed in Duktape 1.1 so that Function.prototype.name is writable.
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* The best fix would actually be to have the property non-writable
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* while simultaneously allowing a Function instance's 'name' property
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* to be set - but Ecmascript cannot express such an access control
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* policy.
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*
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* Duktape 2.x follows ES2015 where .name is again non-writable, but is
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* configurable. So duk_def_prop() can be used to set the name.
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*/
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/*===
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*** test_1 (duk_safe_call)
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writable: false
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enumerable: false
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configurable: true
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MyFunc.name: my_func_name
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final top: 0
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==> rc=0, result='undefined'
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===*/
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static duk_ret_t my_func(duk_context *ctx) {
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(void) ctx;
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return 0;
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}
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static duk_ret_t test_1(duk_context *ctx, void *udata) {
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(void) udata;
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/* Check that Function.prototype.name is writable. */
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duk_eval_string_noresult(ctx,
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"var pd = Object.getOwnPropertyDescriptor(Function.prototype, 'name');\n"
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"print('writable:', pd.writable);\n"
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"print('enumerable:', pd.enumerable);\n"
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"print('configurable:', pd.configurable);\n");
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duk_push_c_function(ctx, my_func, 0);
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duk_push_string(ctx, "name");
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duk_push_string(ctx, "my_func_name");
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duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_VALUE);
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duk_put_global_string(ctx, "MyFunc");
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duk_eval_string_noresult(ctx,
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"print('MyFunc.name:', MyFunc.name);\n");
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printf("final top: %ld\n", (long) duk_get_top(ctx));
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return 0;
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}
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void test(duk_context *ctx) {
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TEST_SAFE_CALL(test_1);
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}
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