40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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'use strict';
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/**
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* Module dependencies.
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*/
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const CIF = require('./cif');
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const _ForeignFunction = require('./_foreign_function');
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const debug = require('debug')('ffi:ForeignFunction');
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const assert = require('assert');
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const ref = require('ref-napi');
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/**
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* Represents a foreign function in another library. Manages all of the aspects
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* of function execution, including marshalling the data parameters for the
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* function into native types and also unmarshalling the return from function
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* execution.
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*/
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function ForeignFunction (funcPtr, returnType, argTypes, abi) {
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debug('creating new ForeignFunction', funcPtr);
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// check args
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assert(Buffer.isBuffer(funcPtr), 'expected Buffer as first argument');
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assert(!!returnType, 'expected a return "type" object as the second argument');
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assert(Array.isArray(argTypes), 'expected Array of arg "type" objects as the third argument');
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// normalize the "types" (they could be strings,
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// so turn into real type instances)
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returnType = ref.coerceType(returnType);
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argTypes = argTypes.map(ref.coerceType);
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// create the `ffi_cif *` instance
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const cif = CIF(returnType, argTypes, abi);
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// create and return the JS proxy function
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return _ForeignFunction(cif, funcPtr, returnType, argTypes);
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}
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module.exports = ForeignFunction;
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