Lines Matching full:param
2823 "desc": "<pre><code class=\"language-c\">napi_status napi_new_instance(napi_env env,\n napi_value cons,\n size_t argc,\n napi_value* argv,\n napi_value* result)\n</code></pre>\n<ul>\n<li><code>[in] env</code>: The environment that the API is invoked under.</li>\n<li><code>[in] cons</code>: <code>napi_value</code> representing the JavaScript function to be invoked\nas a constructor.</li>\n<li><code>[in] argc</code>: The count of elements in the <code>argv</code> array.</li>\n<li><code>[in] argv</code>: Array of JavaScript values as <code>napi_value</code> representing the\narguments to the constructor. If <code>argc</code> is zero this parameter may be\nomitted by passing in <code>NULL</code>.</li>\n<li><code>[out] result</code>: <code>napi_value</code> representing the JavaScript object returned,\nwhich in this case is the constructed object.</li>\n</ul>\n<p>This method is used to instantiate a new JavaScript value using a given\n<code>napi_value</code> that represents the constructor for the object. For example,\nconsider the following snippet:</p>\n<pre><code class=\"language-js\">function MyObject(param) {\n this.param = param;\n}\n\nconst arg = 'hello';\nconst value = new MyObject(arg);\n</code></pre>\n<p>The following can be approximated in Node-API using the following snippet:</p>\n<pre><code class=\"language-c\">// Get the constructor function MyObject\nnapi_value global, constructor, arg, value;\nnapi_status status = napi_get_global(env, &global);\nif (status != napi_ok) return;\n\nstatus = napi_get_named_property(env, global, \"MyObject\", &constructor);\nif (status != napi_ok) return;\n\n// const arg = \"hello\"\nstatus = napi_create_string_utf8(env, \"hello\", NAPI_AUTO_LENGTH, &arg);\nif (status != napi_ok) return;\n\nnapi_value* argv = &arg;\nsize_t argc = 1;\n\n// const value = new MyObject(arg)\nstatus = napi_new_instance(env, constructor, argc, argv, &value);\n</code></pre>\n<p>Returns <code>napi_ok</code> if the API succeeded.</p>",
83410 "desc": "<p><strong>Source Code:</strong> <a href=\"https://github.com/nodejs/node/blob/v18.20.1/lib/wasi.js\">lib/wasi.js</a></p>\n<p>The WASI API provides an implementation of the <a href=\"https://wasi.dev/\">WebAssembly System Interface</a>\nspecification. WASI gives sandboxed WebAssembly applications access to the\nunderlying operating system via a collection of POSIX-like functions.</p>\n<pre><code class=\"language-mjs\">import { readFile } from 'node:fs/promises';\nimport { WASI } from 'wasi';\nimport { argv, env } from 'node:process';\n\nconst wasi = new WASI({\n args: argv,\n env,\n preopens: {\n '/sandbox': '/some/real/path/that/wasm/can/access',\n },\n});\n\n// Some WASI binaries require:\n// const importObject = { wasi_unstable: wasi.wasiImport };\nconst importObject = { wasi_snapshot_preview1: wasi.wasiImport };\n\nconst wasm = await WebAssembly.compile(\n await readFile(new URL('./demo.wasm', import.meta.url)),\n);\nconst instance = await WebAssembly.instantiate(wasm, importObject);\n\nwasi.start(instance);\n</code></pre>\n<pre><code class=\"language-cjs\">'use strict';\nconst { readFile } = require('node:fs/promises');\nconst { WASI } = require('wasi');\nconst { argv, env } = require('node:process');\nconst { join } = require('node:path');\n\nconst wasi = new WASI({\n args: argv,\n env,\n preopens: {\n '/sandbox': '/some/real/path/that/wasm/can/access',\n },\n});\n\n// Some WASI binaries require:\n// const importObject = { wasi_unstable: wasi.wasiImport };\nconst importObject = { wasi_snapshot_preview1: wasi.wasiImport };\n\n(async () => {\n const wasm = await WebAssembly.compile(\n await readFile(join(__dirname, 'demo.wasm')),\n );\n const instance = await WebAssembly.instantiate(wasm, importObject);\n\n wasi.start(instance);\n})();\n</code></pre>\n<p>To run the above example, create a new WebAssembly text format file named\n<code>demo.wat</code>:</p>\n<pre><code class=\"language-text\">(module\n ;; Import the required fd_write WASI function which will write the given io vectors to stdout\n ;; The function signature for fd_write is:\n ;; (File Descriptor, *iovs, iovs_len, nwritten) -> Returns number of bytes written\n (import \"wasi_snapshot_preview1\" \"fd_write\" (func $fd_write (param i32 i32 i32 i32) (result i32)))\n\n (memory 1)\n (export \"memory\" (memory 0))\n\n ;; Write 'hello world\\n' to memory at an offset of 8 bytes\n ;; Note the trailing newline which is required for the text to appear\n (data (i32.const 8) \"hello world\\n\")\n\n (func $main (export \"_start\")\n ;; Creating a new io vector within linear memory\n (i32.store (i32.const 0) (i32.const 8)) ;; iov.iov_base - This is a pointer to the start of the 'hello world\\n' string\n (i32.store (i32.const 4) (i32.const 12)) ;; iov.iov_len - The length of the 'hello world\\n' string\n\n (call $fd_write\n (i32.const 1) ;; file_descriptor - 1 for stdout\n (i32.const 0) ;; *iovs - The pointer to the iov array, which is stored at memory location 0\n (i32.const 1) ;; iovs_len - We're printing 1 string stored in an iov - so one.\n (i32.const 20) ;; nwritten - A place in memory to store the number of bytes written\n )\n drop ;; Discard the number of bytes written from the top of the stack\n )\n)\n</code></pre>\n<p>Use <a href=\"https://github.com/WebAssembly/wabt\">wabt</a> to compile <code>.wat</code> to <code>.wasm</code></p>\n<pre><code class=\"language-console\">$ wat2wasm demo.wat\n</code></pre>",