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Defines a single function for an object.
Syntax
struct JSFunctionSpec { const char *name; JSNativeWrapper call; uint16_t nargs; uint16_t flags; const char *selfHostedName; }; typedef struct JSNativeWrapper { JSNative op; const JSJitInfo *info; } JSNativeWrapper;
Name | Type | Description |
---|---|---|
name |
const char * |
The function's name. |
call |
JSNativeWrapper |
The built-in JS call wrapped by this function. If the function does not wrap a native JS call, set this value to NULL . |
nargs |
uint16_t |
The value used for Function.length . This no longer guarantees anything about the vp array. |
flags |
uint16_t |
The bitwise OR of any number of function flags. |
selfHostedName |
const char * |
The function's name in Self-Hosted JavaScript code. |
Description
JSFunctionSpec
defines the attributes for a single JS function to associate with an object. An application typically has an array of JSFunctionSpec
to define all the functions for an object and calls JS_DefineFunctions
or JS_InitClass
to create the functions and assign them to an object.
JSFunctionSpec
can also be used to define an array element rather than a named property. Array elements are actually individual properties. To define an array element, cast the element's index value to const char*
, initialize the name field with it, and specify the JSPROP_INDEX
attribute in flags.
To define an array of JSPropertySpec
, use JS_FS
, JS_FN
, JS_SYM_FN
, JS_FNINFO
, JS_SELF_HOSTED_FN
, JS_SELF_HOSTED_SYM_FN
, JS_SYM_FNSPEC
, JS_FNSPEC
, and JS_FS_END
.